DEVICE FOR EXTRACTING POURED MOLDS AND METHOD FOR EXTRACTING POURED MOLDS

Abstract

A device for extracting poured molds is provided in which a large torque force can be generated by using an electric motor at an initial stage in a device for extracting molds, and then an upward extraction operation can be performed at a high speed. An electric motor, a driving mechanism including a rotating drive shaft driven by the electric motor, a lifting frame supporting a lower surface of a sand mold part to cause thereof to be capable of lifting, a link member provided between the driving mechanism and the lifting frame, and a rise regulating device abutting on an outer periphery of the molding flask casting frame to regulate rising of the molding flask casting frame. The driving mechanism includes a shifting portion and an upward extraction portion.

Description

FIELD OF TECHNOLOGY

The following relates to a device for extracting molds and a method for extracting molds for extracting poured molds from a casting frame.

BACKGROUND

Conventionally, as a method for extracting poured molds from a casting frame, there is a method of extracting a mold upward from below the mold to directly above by a cylinder device as described in JP 2010-23094 A. The main purpose of this method is to slowly cool a product in the mold for a certain period of time after extracting the mold to the outside without breaking the mold as much as possible.

This method requires a large output when the mold is extracted from the casting frame, and thus it is common to use a hydraulic cylinder.

However, the hydraulic cylinder requires a hydraulic unit for operating and controlling the cylinder, and there is a problem that a hydraulic pump motor is often operated at all times during production, and the amount of electric power increases.

Therefore, in recent years, in order to save energy by reducing power consumption, a de-hydraulic cylinder has been examined, and the electrification of actuators has been promoted.

For example, a device for extracting the poured molds from the casting frame disclosed in JP 2010-23094 A has a structure in which a rotating arm portion having a length of ½ of a lifting stroke is provided on a rotating drive shaft to extract the mold upward by one rotating arm portion.

SUMMARY

However, as shown in test data in a device for extracting poured molds using the conventional hydraulic cylinder (see FIG. 16), there is a characteristic that a short stroke but a large pressure is required at the beginning of extraction, and a large force is not required but a slightly long stroke is required to subsequently extract the mold (sand mold part) upward.

Thus, in a case of using an electric motor, there is a problem that a torque generated in a rotating drive shaft when the mold at the initial stage of extraction is separated from a casting frame inner wall is excessive, and a drive system is increased in size for increasing strength. In addition, there is a problem that in order to generate a large torque, a rotational speed of the rotating arm portion becomes slow, and an upward extraction operation takes time.

An aspect relates to a device for extracting poured molds and a method for extracting molds thereof, in which a large torque can be generated by using an electric motor at an initial stage in a device for extracting molds, and then an upward extraction operation can be performed at a high speed.

A device for extracting poured molds according to a first aspect of embodiments of the present invention includes: an electric motor, a driving mechanism including a rotating drive shaft driven by the electric motor, a lifting frame supporting a lower surface of a sand mold part serving as an inside of a casting frame of poured molds to cause thereof to be capable of lifting, a link member extending in a vertical direction and provided between the driving mechanism and the lifting frame, and a rise regulating device abutting on an outer periphery of the casting frame to regulate rising of the casting frame when the lifting frame is raised.

The driving mechanism includes, a shifting portion shifting the lifting frame upward relatively by a predetermined length in cooperation with the rise regulating device in order to separate the sand mold part from the casting frame in an adhered state at an extraction position where the sand mold part is extracted from the casting frame, and an upward extraction portion extracting the shifted sand mold part upward to a conveyance position with a force smaller than a force of shifting by the shifting portion and at a speed higher than a speed of shifting by the shifting portion.

According to this, by dividing the device for extracting molds into the shifting portion requiring a large force with a short stroke and the upward extraction portion requiring a high speed with a long stroke to work, miniaturization of the device and improvement of the work efficiency can be achieved.

According to the device for extracting poured molds of a further aspect of embodiments of the present invention, in the device for extracting poured molds of the first aspect, the shifting portion includes a rotating portion having a cylindrical shape and including an axis parallel to a rotation center of the rotating drive shaft, the axis being eccentric by a predetermined dimension from the rotation center of the rotating drive shaft.

The upward extraction portion is a rotating arm portion having a predetermined rotation radius extending in a radial direction of the rotating portion, and includes, on a base end portion side, an opening holding portion holding an outer periphery of the rotating portion so as to be relatively rotatable, and includes, on a tip portion side, the rotating arm portion having a first link portion.

The link member includes, at one end, a second link portion coupled to the first link portion of the rotating arm portion in a rotatable manner, and includes, at the other end, a third link portion, and the lifting frame includes a fourth link portion linked to the third link portion in a rotatable manner.

A rotation angle regulating portion is provided between the opening holding portion and the rotating portion in which when the rotating portion rotates relative to the opening holding portion by a predetermined angle, the relative rotation is regulated, so that the rotating portion and the rotating arm portion rotate integrally.

According to this, an eccentric axis moves from below the rotation center to above the rotation center by the rotation of the rotating portion, so that the link member is raised by a distance necessary for shifting. At this time, the rotating portion and the opening holding portion of the rotating arm portion relatively rotate (idle) and the rotating arm portion does not rotate, and thus the link member rises by a distance necessary for shifting by the rotating portion.

When the rotating portion relatively rotates with respect to the opening holding portion by a predetermined angle, a relative rotation (idling) state of the rotating arm portion with respect to the rotating portion is released by a rotation angle regulating device, and the rotating arm portion rotates and the first link portion of the rotating arm portion moves from below the rotation center to above the rotation center, so that the link member is further raised. As a result, the shifted sand mold part can be extracted upward to a position where the sand mold part is conveyed.

According to the device for extracting poured molds of a further aspect of embodiments of the present invention, in the device for extracting poured molds of the further aspect, the eccentric predetermined dimension of the shifting portion is a dimension for generating a first stroke in the vertical direction necessary for shifting the poured sand mold in the casting frame from the inner wall of the casting frame, and at the same time, for causing the rotating portion to generate a force necessary for shifting by a rotational torque of the electric motor. A dimension of the predetermined rotation radius of the rotating arm portion is a dimension for generating a second stroke in the vertical direction necessary for extracting the sand mold part separated from the casting frame upward.

Note that the “dimension for generating” indicates not the first stroke itself but, for example, ½ of the first stroke or a dimension directly or indirectly related thereto. The same applies to the second stroke.

According to this, a dimension at an eccentric position of the rotating portion shifted by a predetermined dimension from the rotation center of the rotating drive shaft is set for generating the force and the first stroke necessary for separating the poured mold in the casting frame from the casting frame inner wall, and a dimension having a predetermined dimension from the rotation center of the rotating arm portion as the rotation radius is set for generating the force and the second stroke necessary for upward extracting after separating from the casting frame inner wall inside the casting frame.

As a result, the electric motor serving as only one drive source can efficiently set a high output range due to a low speed rise of the first stroke and a low output range due to a high speed rise of the second stroke according to a load.

According to the device for extracting poured molds of a further aspect of embodiments of the present invention, in the device for extracting poured molds of the further aspect, a link biasing device biasing the link member at the time of lowering of the lifting frame so that the rotating arm portion rotates in a direction opposite to a direction at the time of rising is provided.

According to this, by providing the link biasing device so as to press the link member by a predetermined dimension in the direction opposite to an operation in the rising direction at a rising end position of the lifting frame, the rotating arm portion is smoothly rotated in the direction opposite to that at the time of rising at a start of lowering of the lifting frame, so that a lowering step can be quickly and reliably performed.

According to a device for extracting poured molds of a further aspect of embodiments of the present invention, in the device for extracting poured molds of an aspect of embodiments of the present invention, the rise regulating device includes, at least a pair of hydraulic cylinders each including a piston rod capable of abutting on an outer periphery upper surface of an upper casting frame of the casting frame, an oil tank including an oil layer storing hydraulic oil and an air layer generated above the oil layer, a hydraulic switching valve provided between the oil tank and the hydraulic cylinder, a pneumatic pump applying a pressure to air to feed the air, and a pneumatic switching valve provided between the pneumatic pump and the air layer of the oil tank. The hydraulic oil is supplied from the oil tank to the hydraulic switching valve by an air pressure applied to the air layer of the oil tank.

According to this, the hydraulic oil is supplied to a hydraulic switching valve by an air pressure via the oil tank, so that it is possible to stop a large back pressure generated at the initial stage of upward extraction of the mold by a withstanding pressure of the hydraulic cylinder and the hydraulic switching valve without using a hydraulic unit.

According to a method for extracting poured molds of a further aspect of embodiments of the present invention, there is provided a method for extracting poured molds using a device for extracting poured molds including an electric motor, a driving mechanism driven by the electric motor, a lifting frame supporting a lower surface of a sand mold part serving as an inside of a casting frame of poured molds to cause thereof to be capable of lifting, a link member extending in a vertical direction and is provided between the driving mechanism and the lifting frame, and a rise regulating device abutting on an outer periphery of the molding flask to regulate rising of the molding flask when the lifting frame is raised.

In embodiments, the method includes, by using the driving mechanism, a shifting step of relatively shifting the sand mold part by a predetermined length in the vertical direction in order to separate the sand mold part that is in an adhered state from the casting frame in cooperation with the rise regulating device at an extraction position where the sand mold part is extracted from the casting frame, and an upward extracting step of extracting the shifted sand mold part upward to a conveyance position with a force smaller than a force of shifting by the shifting step and at a speed higher than a speed of shifting by the shifting step.

According to this, by dividing the device for extracting molds into the shifting step requiring a large force with a short stroke and the upward extracting step requiring a high speed with a long stroke to work, miniaturization of the device and improvement of the work efficiency can be achieved.

BRIEF DESCRIPTION

Some of the embodiments will be described in detail, with references to the following Figures, wherein like designations denote like members, wherein:

FIG. 1 is an outline drawing from the front side showing a partial cross-sectional view for an embodiment of a device for extracting poured molds;

FIG. 2 is an outline drawing from the side showing a partial cross-sectional view for an embodiment of the device for extracting poured molds;

FIG. 3 is a plan drawing of a positional relationship of a rise regulating device with respect to a casting frame;

FIG. 4 is a cross-sectional drawing taken along line IV-IV in FIG. 1;

FIG. 5 is a drawing of a rotating drive shaft and a rotating portion as viewed from an X-axis direction;

FIG. 6 is a drawing of a rotating drive shaft and a rotating portion as viewed from a Y-axis direction;

FIG. 7 is a cross-sectional drawing taken along line VII-VII in FIG. 1;

FIG. 8 is a drawing a state in which the rotating drive shaft is rotated by 90 degrees;

FIG. 9 is a drawing a state in which the rotating drive shaft is rotated by 180 degrees;

FIG. 10 is a drawing a state in which the rotating drive shaft is rotated by 270 degrees and the rotating arm portion is rotated by 90 degrees;

FIG. 11 is a drawing a state in which the rotating drive shaft is rotated by 360 degrees and the rotating arm portion is rotated by 180 degrees;

FIG. 12 is a drawing a state in which an extracted sand mold part is conveyed;

FIG. 13 is a drawing a device for extracting poured molds according to another example;

FIG. 14 is a drawing of a rotating drive shaft and a rotating portion as viewed from the X-axis direction;

FIG. 15 is a drawing of a rotating drive shaft and a rotating portion as viewed from the Y-axis direction; and

FIG. 16 is a graph showing a relationship between a hydraulic pressure output for extraction and a stroke in a device for extracting poured molds using a conventional hydraulic.

DETAILED DESCRIPTION

Embodiments

An embodiment of a device for extracting poured molds according to the present invention will be described below with reference to FIGS. 1 to 12.

A horizontal direction in FIG. 1 is referred to as an X-axis direction, and a horizontal direction orthogonal to the X-axis direction is referred to as a Y-axis direction. When a virtual center line is considered for a tangible object, a side close to the center line is referred to as an inner side, and a side far from the center line is referred to as an outer side. As illustrated in FIG. 1, a device for extracting poured molds 1 according to the embodiment includes an electric motor 2, a driving mechanism 3, a lifting frame 4, a link member 5, and a rise regulating device 7.

The device for extracting poured molds 1 is installed such that a part of a lower portion is housed in a trench TR dug in a floor surface FL. A large part of the device for extracting poured molds 1 is installed on a base frame BF laterally bridged on upper end portions of the trench TR facing each other in the X-axis direction.

(Base Frame)

The base frame BF is made of, for example, iron and formed in a rectangular frame shape. Five horizontal bar portions BF2 are laterally bridged between long side portions BF1 facing each other so as to extend in the Y-axis direction. The long side portions BF1 and the horizontal bar portions BF2 are formed such that height positions coincide with each other at each upper end surface and each lower end surface.

A rectangular frame is formed on upper end surfaces of a first horizontal bar portion BF2a and a fourth horizontal bar BF2d of the horizontal bars BF2 from the left side in FIG. 1 together with upper end surfaces of the long side portions BF1 facing each other. And a lower end portion of a support leg portion 6 of the device for extracting poured molds 1 described later is fixedly supported on an upper surface of the rectangular frame.

A bearing BR supporting rotating drive shaft 31 described later is fixed on each of lower end surfaces of a second horizontal bar portion BF2b, a third horizontal bar BF2c, and a fifth horizontal bar BF2e of the horizontal bars BF2 from the left side in FIG. 1.

For example, rotary encoder RE is attached as a rotation angle sensor to a lower end surface of the first horizontal bar BF2a of the horizontal bar portions BF2 from the left side in FIG. 1.

(Electric Motor)

The electric motor 2 drives the driving mechanism 3 described later.

As the electric motor 2, for example, an induction motor can be used. The induction motor is a type that does not require complicated control like a servomotor.

The electric motor 2 is assembled to an upper right end surface of the base frame BF in FIG. 1 via a pedestal. A small sprocket 21 is assembled to the outer periphery of an output shaft of the electric motor 2. A large sprocket 22 having a diameter larger than that of the small sprocket 21 is provided at one end portion of the rotating drive shaft 31 of the driving mechanism 3 so as to face the small sprocket 21. A rotation shaft of the small sprocket 21 and a rotation shaft of the large sprocket 22 are provided in parallel to each other.

An annular endless roller chain 23 is hooked between the large sprocket 22 and the small sprocket 21 to transmit a rotational torque of the electric motor 2 to the rotating drive shaft 31.

(Driving Mechanism)

The driving mechanism 3 is driven by the electric motor 2, and moves up and down the link member 5 lifting the lifting frame 4 described later.

The driving mechanism 3 includes the rotating drive shaft 31, a rotating portion 32, and a rotating arm portion 33.

(Rotating Drive Shaft)

The rotating drive shaft 31 is made of, for example, iron, formed in a round rod shape, and disposed below the base frame BF so as to extend in the X-axis direction. A thick shaft portion 31a having a slightly large diameter and shifted inward by a predetermined width in the X-axis direction from the left end portion is circumferentially provided at a position on the left side in FIG. 1. The large sprocket 22 having a large outer diameter is assembled to a right end portion of the rotating drive shaft 31 in FIG. 1 so as to be relatively non-rotatable. The rotation center of the large sprocket 22 is coaxial with an axis 32c of the rotating drive shaft 31.

As described above, the rotary encoder RE is disposed at the left end portion of the rotating drive shaft 31 in FIG. 1, and detects a rotation angle of the rotating drive shaft 31.

The rotating portion 32 is integrally fixed to a central portion of the thick shaft portion 31a so as to protrude in a radial direction.

(Rotating Portion)

As illustrated in FIGS. 5 and 6, the rotating portion 32 is formed in a short cylindrical shape having a diameter larger than that of the thick shaft portion 31a of the rotating drive shaft 31. The rotating portion 32 constitutes a part of the shifting portion.

A rotation center 31c of rotating drive shaft 31 and the axis 32c of the rotating portion 32 are set to be parallel to each other, and the axis 32c of the rotating portion 32 is fixed in a state of being eccentric from the rotation center 31c of the rotating drive shaft 31 by a predetermined dimension. The rotation center 31c of the rotating drive shaft 31 and the axis 32c of the rotating portion 32 mainly constitute the shifting portion. The eccentric dimension is a dimension for generating a first stroke FS described later, and corresponds to ½ of the first stroke FS in the present embodiment.

The outer periphery of the rotating portion 32 is held in an opening holding portion 33a of the rotating arm portion 33 in a relatively rotatable manner described later (see FIG. 2). The rotating portion 32 is provided with a locking portion 321.

(Locking Portion)

As illustrated in FIG. 5, when the rotating portion 32 relatively rotates forward or backward by 180 degrees, the locking portion 321 abuts on a locked portion 331 provided in the rotating arm portion 33 described later, so that a relative rotation angle between the rotating portion 32 and the rotating arm portion 33 is regulated.

The locking portion 321 is formed in a rectangular plate shape extending so as to protrude in a radial direction from the rotating drive shaft 31 (integral with the rotating portion 32). The locking portions 321 are provided on both sides, respectively, of the rotating portion 32 so as to sandwich the rotating portion 32 along the X-axis direction, and are integrally assembled to the rotating drive shaft 31.

(Rotating Arm Portion)

When cut along a virtual vertical surface including the Y-axis direction, the rotating arm portion 33 is formed to have a substantially oval cross section, and the opening holding portion 33a opened in the X-axis direction is formed on a base portion side. The locked portions 331 each having an arc shape shorter than a semicircular arc by a predetermined length are assembled to end edge portions on both sides, respectively, of an opening of the opening holding portion 33a.

(Locked Portion)

In the locked portion 331, when the rotating arm portion 33 rotates around the rotating portion 32, one or the other side surface of the locking portion 321 abuts on an upper end portion or a lower end portion of the locked portions 331 having the arc shape. Accordingly, the relative rotation between the rotating portion 32 and the rotating arm portion 33 after the abutment is regulated. In addition, by the locking portion 321 and the locked portion 331, in the rotating arm portion 33, specifically, 180 degrees is set to a range in relatively rotatable with respect to the rotating portion 32. The locking portion 321 and the locked portion 331 constitute the rotation angle regulating portion.

A first link portion L1 is formed on a tip portion side of the rotating arm portion 33.

The first link portion L1 includes a coupling hole LH, a bearing BR, and a shaft pin SP.

The coupling hole LH is penetratingly provided in a circular shape such that the axis extends in the X-axis direction, and pivotally supports the shaft pin SP via the bearings BR provided at both end edges of the opening, respectively.

The shaft pin SP is formed such that both end portions each have a diameter smaller than that of a central portion, and is provided such that two bearings BR sandwich two step portions which are boundaries between both end portions and the central portion.

Second link portions L2 of the link member 5 are coupled to the tip portions on both sides, respectively, of the shaft pin SP. The second link portion L2 includes communication holes CH formed in two members 51 each having a long plate shape of the link member 5 described later.

As illustrated in FIG. 2, a contact surface 33b is provided on a side surface of the rotating arm portion 33 that is in front of rotation when the rotating arm portion 33 performs rotation to raise the link member 5. The contact surface 33b is provided in parallel and flat with a line connecting the rotation center 31c of the rotating drive shaft 31 to the axis of the coupling hole LH.

When the rotating arm portion 33 rotates and the lifting frame 4 reaches a rising end, the contact surface 33b abuts on a rotating arm portion stopper AS provided so as to protrude toward the inside of the long side portion BF1 of the base frame BF.

The rotating arm portion stopper AS includes a female screw cylinder having a cylindrical shape fixed to the inside of the long side portion BF1 such that the axis extends in the Y-axis direction, a bolt having a base end portion screwed into the female screw cylinder, and a nut screwed into the bolt.

The contact surface 33b abuts on the rotating arm portion stopper AS, so that the rotating arm portion 33 is prevented from rotating by a desired rotation angle or more.

(Link Member)

The link member 5 transmits a driving force of the driving mechanism 3 to the lifting frame 4 described later. The link member 5 includes the two members 51 each made of, for example, iron and having the long plate shape and extending in the vertical direction. The two members 51 are integrally formed by being stacked with each other with a space therebetween. A curved portion 51a having a lower end provided with the second link portion L2 is formed in each lower portion. A straight portion 51b continuous with the curved portion 51a is formed in an upper portion, and a third link portion L3 is provided at an upper end of the straight portion 51b.

The curved portion 51a is formed to be curved along a side surface of the rotating drive shaft 31 so as to not come into contact with the rotating drive shaft 31.

The communication hole CH is formed in each of the two members 51 at a lower end portion of the link member 5. The communication hole CH is penetratingly provided such that an axis extends in the X-axis direction, and pivotally supports the shaft pin SP. The communication hole CH at the lower end of the link member 5 constitutes the second link portion L2.

The two members 51 of the link member 5 are coupled and integrated by two bridging portions 52 each having a rectangular cross section.

The communication hole CH is formed in each of the two members 51 at an upper end portion of the link member 5. The communication hole CH is penetratingly provided such that an axis extends in the X-axis direction, and pivotally supports the shaft pin SP. The communication hole CH at the upper end portion of the link member 5 constitutes the third link portion L3.

A fourth link portion L4 coupled to the third link portion L3 is provided on a bottom lower surface of the lifting frame 4. The fourth link portion L4 includes a holding portion HP formed in a substantially cubic shape, a holding hole HH formed in the holding portion HP, and the shaft pin SP. The holding hole HH is formed such that an axis extends along the X-axis direction. Bearings BR are provided at both ends, respectively, of an opening of the holding hole HH, and the shaft pin SP is freely rotatably supported by the bearings BR.

The lifting frame 4 described later is guided to move along the vertical direction by a guide portion 61 provided on the support leg portion 6 fixed on the base frame BF.

(Support Leg Portion)

The support leg portion 6 is made of, for example, iron and formed in a substantially rectangular tubular shape. The support leg portion 6 has a lower end portion fixed to the rectangular frame formed by two long side portions BF1 extending in the X-axis direction of the base frame BF, the first (in FIG. 1) horizontal bar BF2a, and the fourth (in FIG. 1) horizontal bar BF2d.

The support leg portion 6 includes four side surface portions 6a and 6b and a top plate portion 6c, and is formed in a tower shape as a whole. One of the side surface portions 6a arranged in the Y-axis direction in the support leg portion 6 is formed with an inclined surface 6a1 having a lower portion inclined outward.

The inclined surface 6a1 prevents the curved portion 51a of the link member 5 from coming into contact with the support leg portion 6 when the rotating arm portion 33 rotates to a horizontal position.

Two side surface portions 6b arranged in the X-axis direction in the support leg portion 6 each have an upper portion formed in a rectangular shape and a lower portion formed in a trapezoidal shape in accordance with a shape of each of the side surface portions 6a arranged in the Y-axis direction. The upper portion and the lower portion are continuously integrated.

The top plate portion 6c having a rectangular shape is provided at an upper end of the support leg portion 6. The top plate portion 6c is provided with a through hole 6c1 having a rectangular shape through which the link member 5 penetrates and an attachment hole 6c2 to which the guide portion 61 is fixed (see FIG. 4).

The through hole 6c1 is formed in a size with a margin such that the link member 5 is loosely inserted. The attachment holes 6c2 are provided on both sides, respectively, across the through hole 6c1 along the X-axis direction.

(Guide Portion)

The guide portion 61 includes a guide tubular portion 61a and a guide rod 61b. The guide tubular portion 61a is formed in a cylindrical shape extending in the vertical direction, and is fixed to the attachment hole 6c2 with a lower portion of the guide tubular portion 61a penetrating through the attachment hole 6c2. A flange-shaped portion 61c is circumferentially provided on a lower portion outer periphery of the guide tubular portion 61a, and a load from above applied to the guide tubular portion 61a is received by a peripheral edge portion of the attachment hole 6c2.

The guide rod 61b is slidably inserted through the guide tubular portion 61a. The guide rod 61b is formed in a round rod shape extending in the vertical direction, and the lifting frame 4 is assembled to an upper end portion.

The guide portion 61 guides the lifting frame 4 to move along the vertical direction when the lifting frame 4 is pushed up and pulled down by the link member 5.

(Lifting Frame)

The lifting frame 4 includes an upward extraction plate 41, a support plate 42, the fourth link portion L4, and a cover member 43.

The upward extraction plate 41 is made of, for example, iron and a rectangular plate material, and supports a lower surface of a sand mold part SM formed inside a casting frame CF.

A lower surface of the upward extraction plate 41 is supported by the support plate 42. The support plate 42 is made of iron and formed in a rectangular thick plate shape. When the mold (sand mold part SM) is shifted and extracted upward from the casting frame CF, the support plate 42 prevents the upward extraction plate 41 from being deformed by the force applied to the upward extraction plate 41, and causes smooth shifting and upward extraction work.

The upward extraction plate 41 is provided with the cover member 43. The cover member 43 is formed in a substantially rectangular tubular shape, is continuous with the lower surface of the upward extraction plate 41 at an upper end portion, and is provided so as to surround the four side surfaces of the support plate 42. The cover member 43 extends to the vicinity of a lower end portion of the support leg portion 6 at a lower portion to cover the guide portion 61, the link member 5, and the support leg portion 6, and prevents spilled sand from entering inside the driving mechanism In the cover member 43, an inclined surface is formed on one of side surfaces arranged 3 in extracting the sand mold part SM. in the Y-axis direction so as to correspond to a shape of a lower portion of the support leg portion 6, and side surfaces arranged in the X-axis direction are formed in a trapezoidal shape in which an upper portion is rectangular and a lower portion is continuous to the rectangular upper portion.

(Rise Regulating Device)

The rise regulating device 7 presses only the molding flask CF from above in extracting the mold, and is used to extract the sand mold part SM upward from the molding flask CF by the lifting frame 4.

The rise regulating device 7 includes a hydraulic cylinder device 71, a hydraulic switching valve 72, an oil tank 73, a pneumatic switching valve 74, and a pneumatic pump AP.

The hydraulic cylinder device 71 includes a cylinder portion 71a, a piston portion 71b, and a piston rod 71c.

As illustrated in FIG. 2, the cylinder portions 71a are fixed to lower surfaces of four corners of a support frame HF so as to face four corners, respectively, of an upper casting frame to be extracted (see FIG. 3). The support frame HF is a part of a structure, and is formed in a rectangular frame shape with a center opened by a member having a rectangular cross section. The lower surface of the support frame HF is set at substantially the same height position as the height position of the rising end of the lifting frame 4.

The cylinder portion 71a includes an opening opening downward, and the piston rod 71c having an upper end portion coupled to the piston portion 71b in the cylinder portion 71a moves forward and backward from the opening. The piston rod 71c is made of, for example, iron and formed in a rod shape. A lower end of the piston rod 71c abuts on a corner portion of an upper end surface of the casting frame CF from which the sand mold part SM is extracted. Note that in the present embodiment, the cylinder portions 71a abut on the four corner portions, respectively, of the upper casting frame, but embodiments of the present invention are not limited thereto. For example, as illustrated in FIG. 3, a pair of cylinder portions 171a may be provided so as to abut on central portions of sides, respectively, facing each other of the upper casting frame.

The oil tank 73 is set such that an oil layer 73a in which hydraulic oil is stored is generated in a lower portion, and an air layer 73b filled with air is generated in an upper portion. The lower portion of the oil tank 73 having the oil layer 73a and the upper portion of the cylinder portion 71a communicate with each other via an oil feed pipe 75. The hydraulic switching valve 72 (electromagnetic switching valve) is provided between the oil tank 73 and the cylinder portion 71a, and a control device controls oil feeding and stopping of the hydraulic oil.

An upper portion of the oil tank 73 having the air layer 73b communicates with the pneumatic pump AP via an air pipe 76. The pneumatic switching valve 74 (electromagnetic switching valve) is provided between the oil tank 73 and the pneumatic pump AP to adjust the air pressure in the cylinder portion 71a and the oil tank 73.

(Link Biasing Device)

At the time of lowering of the lifting frame 4, a link biasing device 8 biases the link member 5 so that the rotating arm portion 33 rotates in a direction opposite to that at the time of rising.

As illustrated in FIGS. 2 and 7, the link biasing device 8 includes a cam member 81 provided on one side surface of the two members 51 having the long plate shape of the link member 5, and a driven node member 82 generating an biasing force when pressed by the cam member 81 to push back the cam member 81 and the link member 5.

When cut along a virtual vertical plane including the Y-axis, the cam member 81 has a cross section of a trapezoidal shape rotated by 90 degrees. An upper base of the trapezoid is a vertical surface 81a facing a driven node member side described later, and a lower base is a vertical surface 81b connected in parallel to the link member 5. An inclined surface 81c connecting an upper end edge of the vertical surface 81a of the upper base and an upper end edge portion of the vertical surface 81b of the lower base is included. The inclined surface 81c corresponds to an oblique side of the trapezoidal shape. The inclined surface 81c and the vertical surface 81b of the lower base form an acute angle expanding downward.

As the cam member 81, the inclined surface 81c and the vertical surface 81a of the upper base are configured to abut on the driven node member 82.

The driven node member 82 includes a support base 821 fixed to a vertical wall inside the support leg portion 6, a bell crank portion 822 swingably attached to a support shaft 820 provided on the support base 821, a guide roller portion 823 provided at a tip above the bell crank portion 822, and a coil spring 824 having one end portion coupled to a tip below the bell crank portion 822.

The coil spring 824 has the other end portion coupled to an attachment piece provided at an upper end corner inside the support leg portion 6, and the guide roller portion 823 is configured to bias the bell crank portion 822 in a direction protruding toward the link member 5. The support base 821 is provided with a stopper portion 825 preventing the guide roller portion 823 from excessively protruding so as to regulate the rotation of the bell crank portion 822.

(Roller Conveyor)

The casting frame CF is conveyed by a roller conveyor RC extending in the X-axis direction to a horizontal position (extraction position EP), which is a height position when the upward extraction plate 41 of the lifting frame 4 is a lowering end, at which the upward extraction plate 41 can support the sand mold part SM. The casting frame CF with a mold before extraction is conveyed into the extraction position EP by the roller conveyor RC, and is positioned by a position sensor (not illustrated). The casting frame CF after the extraction is conveyed out from the extraction position EP. Since the roller conveyor RC is a known technique, the description thereof will be omitted.

(Mold Conveying Device)

The sand mold part SM extracted from the casting frame CF is conveyed to the next step by a mold conveying device provided at the height position where the sand mold part SM is extracted. As the mold conveying device, for example, a belt conveyor BC can be used.

(Control Device)

The control device (not illustrated) drives the electric motor 2 and controls the rotational position of the rotating drive shaft 31. The control device controls switching operations of the hydraulic switching valve 72 and the pneumatic switching valve 74.

(Operation)

The operation of the device for extracting poured molds 1 will be described below with reference to FIGS. 2, 8, 9, 10, 11, and 12.

First, FIG. 2 illustrates a state before the device for extracting poured molds 1 extracts the sand mold part SM from the casting frame CF.

The casting frame CF and the sand mold part SM, which are a poured mold, are conveyed into the extraction position EP and positioned by the roller conveyor RC.

The lifting frame 4 is held at a lowering end position FEP. At this time, the axis 32c of the rotating portion 32 and the locking portion 321 are located vertically directly below the rotation center 31c of the rotating drive shaft 31. The first link portion L1 of the rotating arm portion 33 is located vertically directly below the rotation center 31c of the rotating drive shaft 31.

The locking portion 321 is in a state of abutting on an end portion below the locked portion 331.

A gap is formed between the upper end portion of the lifting frame 4 and the lower end portion of the sand mold part SM.

The pneumatic switching valve 74 is positioned at a port which is a position at which the pneumatic pump AP communicates with the opening side of the hydraulic cylinder device 71. The hydraulic switching valve 72 is positioned at a port which is a position at which the oil layer 73a of the oil tank 73 communicates with a cap side of the hydraulic cylinder device 71. As a result, the piston rod 71c is held at a raised position without coming into contact with the conveyed casting frame CF.

Next, as illustrated in FIG. 8, the control device rotates the rotating drive shaft 31 to rotate the rotating portion 32. This rotation indicates a state in which the rotating drive shaft 31 is rotated from 0 degrees to 180 degrees, and FIG. 8 indicates a state at 90 degrees, which is a midpoint thereof. Since the rotating portion 32 is integral with the rotating drive shaft 31, the axis 32c is eccentric from the rotation center 31c, but the rotating portion 32 rotates in conjunction with the rotating drive shaft 31.

The locking portion 321 is located away from a lower end of the locked portion 331 and rotated by 90 degrees together with the rotating portion 32.

The rotating arm portion 33 does not rotate, and the axis 32c of the rotating portion 32 rises to the same height as the rotation center 31c of the rotating drive shaft 31. Thus, the rotating arm portion 33 rises at the position of 90 degrees by an amount of eccentricity between the rotation center 31c of the rotating drive shaft 31 and the axis 32c of the rotating portion 32. As a result, the link member 5 raises the lifting frame 4. First, an approach of filling a gap between the lifting frame 4 and the sand mold part SM is performed, and subsequently, “shift” is generated between the casting frame CF and the sand mold part SM.

At this time, the control device first positions the pneumatic switching valve 74 at a port such that the pneumatic pump AP communicates with the air layer 73b of the oil tank 73. After the hydraulic pressure increases and the piston rod 71c advances, the hydraulic switching valve 72 is switched to a shut-off position, and a state in which the piston rod 71c presses the upper end portion of the casting frame CF is maintained.

FIG. 9 illustrates a state in which the rotating portion 32 is rotated up to 180 degrees while continuing the above state. A length from the lowering end position FEP to this raised position is the first stroke FS generated when the rotating portion is rotated by 180 degrees. The locking portion 321 abuts on the upper end of the locked portion 331. As a result, the rotating portion 32 in FIG. 9 cannot relatively rotate with respect to the rotating arm portion 33 in the clockwise direction. Thus, when the rotating drive shaft 31 rotates by 180 degrees or more, the rotating arm portion 33 rotates integrally with the rotating portion 32 in the clockwise direction while the rotating drive shaft 31 rotates from 180 degrees to 360 degrees.

FIG. 10 illustrates a state in which the rotating drive shaft 31 is at a position of 270 degrees, which is a midpoint thereof. The first link portion L1 of the rotating arm portion 33 is horizontally aligned with the rotation center 31c of the rotating drive shaft 31. Thus, the lower portion of the link member 5 swings largely sideways.

The link member 5 greatly pushes up the lifting frame 4 in the upper portion to extract the sand mold part SM from the casting frame CF.

FIG. 11 illustrates a state in which the rotating drive shaft 31 is rotated to a position of 360 degrees. A length by which the lifting frame 4 is pushed up when the rotating drive shaft 31 is rotated from 180 degrees to 360 degrees to rotate the rotating arm portion 33 is the second stroke SS.

The contact surface 33b of the rotating arm portion 33 abuts on the rotating arm portion stopper AS to regulate further rotation of the rotating arm portion 33.

The cam member 81 presses the guide roller portion 823 to rotate the bell crank portion 822 clockwise (in FIG. 11). As a result, the coil spring 824 is stretched to generate a biasing force for biasing the bell crank portion 822 in the counterclockwise direction.

The control device positions the pneumatic switching valve 74 at a port such that the oil tank 73 communicates with the atmosphere and the pneumatic pump AP communicates with the opening side of the hydraulic cylinder device 71. The control device positions the hydraulic switching valve 72 at a port at a position where the oil layer 73a of the oil tank 73 communicates with the cap portion side of the hydraulic cylinder device 71.

The sand mold part SM is completely extracted from the casting frame CF and is raised to a height position of the belt conveyor BC to be conveyed. FIG. 12 illustrates a state in which the extracted sand mold part SM is conveyed to the next step by the belt conveyor BC.

The control device reversely rotates (counterclockwise rotation in FIG. 11) the rotating drive shaft 31, so that the lifting frame 4 is lowered. At this time, the link member 5 is biased in a direction in which the rotating arm portion 33 rotates in the reverse direction, and thus the link member 5 can smoothly and reliably rotate in the reverse direction to lower the lifting frame 4. The casting frame CF s conveyed to the downstream side by the roller conveyor RC, and a new casting frame CF before extraction is conveyed into the extraction position EP from the upstream side.

As is clear from the above description, the device for extracting poured molds 1 according to the embodiment of the present invention includes the electric motor 2, the driving mechanism 3 including the rotating drive shaft 31 driven by the electric motor 2, the lifting frame 4 supporting the lower surface of the sand mold part SM inside the casting frame CF of the poured molds to cause thereof to be capable of lifting, the link member 5 extending in the vertical direction and provided between the driving mechanism 3 and the lifting frame 4, and the rise regulating device 7 abutting on the outer periphery of the casting frame CF to regulate rising of the casting frame CF when the lifting frame 4 is raised.

The driving mechanism 3 includes the shifting portion (rotating portion 32) shifting the lifting frame 4 upward relatively by a predetermined length in cooperation with the rise regulating device 7 in order to separate the sand mold part SM from the casting frame CF in the adhered state at the extraction position EP where the sand mold part SM is extracted from the casting frame CF, and the upward extraction portion (rotating arm portion 33) extracting the shifted sand mold part SM upward to a conveyance position TP with the force smaller than the force of shifting by the shifting portion and at the speed higher than the speed of shifting by the shifting portion.

According to this, by dividing the device for extracting poured molds 1 into the shifting portion requiring a large force with a short stroke and the upward extraction portion requiring a high speed with a long stroke to work, miniaturization of the device and improvement of the work efficiency can be achieved.

In addition, in the device for extracting poured molds of the first aspect, the shifting portion includes the rotating portion 32 having a cylindrical shape and including the axis 32c parallel to the rotation center 31c of the rotating drive shaft 31, the axis 32c being eccentric by the predetermined dimension from the rotation center 31c of the rotating drive shaft 31.

The upward extraction portion is the rotating arm portion 33 having the predetermined rotation radius extending in the radial direction of the rotating portion 32, and includes, on the base end portion side, the opening holding portion 33a holding the outer periphery of the rotating portion 32 so as to be relatively rotatable, and includes, on the tip portion side, the rotating arm portion 33 having the first link portion L1.

The link member 5 includes, at one end, the second link portion L2 coupled to the first link portion L1 of the rotating arm portion 33 in a rotatable manner, and includes, at the other end, the third link portion L3, and the lifting frame 4 includes the fourth link portion L4 linked to the third link portion L3 in a rotatable manner.

The rotation angle regulating portion (locking portion 321 and locked portion 331) is provided between the opening holding portion 33a and the rotating portion 32 in which when the rotating portion 32 relatively rotates with respect to the opening holding portion 33a by the predetermined angle, the relative rotation is regulated, so that the rotating portion 32 and the rotating arm portion 33 rotate integrally.

According to this, the eccentric axis 32c moves from below the rotation center 31c to above the rotation center 31c by the rotation of the rotating portion 32, so that the link member 5 is raised by the distance necessary for shifting. At this time, the rotating portion 32 and the opening holding portion 33a of the rotating arm portion 33 relatively rotate (idle) and the rotating arm portion 33 does not rotate, and thus the link member 5 rises by the distance necessary for shifting by the rotating portion 32.

When the rotating portion 32 relatively rotates with respect to the opening holding portion 33a by the predetermined angle, the relative rotation (idling) state of the rotating arm portion 33 with respect to the rotating portion 32 is released by the rotation angle regulating device (locking portion 321 and locked portion 331), and the rotating arm portion 33 rotates and the first link portion L1 of the rotating arm portion 33 moves from below the rotation center 31c to above the rotation center 31c, so that the link member 5 is further raised. As a result, the shifted sand mold part SM can be extracted upward to the position EP where the sand mold part SM is conveyed.

Further, the predetermined dimension in which the axis 32c of the rotating portion 32 is eccentric from the rotation center 31c of the rotating drive shaft 31 is a dimension for generating the first stroke FS in the vertical direction necessary for shifting the poured sand mold part SM in the casting frame CF from the inner wall of the casting frame CF, and at the same time, for causing the rotating portion 32 to generate a force necessary for shifting by the rotational torque of the electric motor 2. The dimension of the predetermined rotation radius of the rotating arm portion 33 is a dimension for generating the second stroke SS in the vertical direction necessary for extracting the sand mold part SM separated from the casting frame CF upward.

According to this, an eccentric dimension at a position shifted by a predetermined dimension from the rotation center 31c of the rotating drive shaft 31 is set as a force and the first stroke FS necessary for separating the poured mold (sand mold part SM) in the casting frame CF from the casting frame inner wall, and a dimension having a predetermined dimension from the rotation center 31c of the rotating arm portion 33 as the rotation radius is set as a force and the second stroke SS necessary for upward extracting after separating from the casting frame inner wall.

A distance from the rotation center 31c of the rotating drive shaft 31 to the center of the first link portion L1 rotated by the rotating arm portion 33 is longer than a distance from the rotation center 31c of the rotating drive shaft 31 to the axis 32c of the rotating portion 32. Thus, when an angular velocity of the rotating drive shaft 31 is the same, a rotational speed of the rotating arm portion 33 becomes faster than a rotational speed of the rotating portion 32, and accordingly, a speed of the first stroke FS associated with the rotation of the rotating portion 32 becomes slower than a speed of the second stroke SS associated with the rotation of the rotating arm portion 33.

The torque is obtained by multiplying a “distance from the rotation center 31c” by a “circumferential force”. Thus, even when the torque from the electric motor 2 generated in the rotating drive shaft 31 is the same, the force of the first stroke FS associated with the rotation of the rotating portion 32 having a short distance from the rotation center 31c is larger than the force of the second stroke SS associated with the rotation of the rotating arm portion 33 having a long distance from the rotation center 31c.

As a result, a drive source of one electric motor 2 can efficiently set a high output range due to a low speed rise of the first stroke FS and a low output range due to a high speed rise of the second stroke SS according to a load.

The link biasing device 8 biasing the link member 5 at the time of lowering of the lifting frame 4 so that the rotating arm portion 33 rotates in the direction opposite to that at the time of rising is provided.

According to this, by providing the link biasing device 8 so as to press the link member 5 by the predetermined dimension in the direction opposite to the operation in the rising direction at the rising end position of the lifting frame 4, the rotating arm portion 33 is smoothly rotated in the direction opposite to that at the time of rising at the start of lowering of the lifting frame 4, so that the lowering step can be quickly and reliably performed.

The rise regulating device 7 includes at least the pair of hydraulic cylinder devices 71 each including the piston rod 71c capable of abutting on the outer periphery upper surface of the upper casting frame of the casting frame CF, the oil tank 73 including the oil layer 73a storing the hydraulic oil and the air layer 72b generated above the oil layer 73a, the hydraulic switching valve 72 provided between the oil tank 73 and the hydraulic cylinder device 71, the pneumatic pump AP applying a pressure to air to feed the air, and the pneumatic switching valve 74 provided between the pneumatic pump AP and the air layer 73b of the oil tank 73. The hydraulic oil is supplied from the oil tank 73 to the hydraulic switching valve 72 by an air pressure applied to the air layer 73b of the oil tank 73.

According to this, the hydraulic oil is supplied to the hydraulic switching valve 72 by the air pressure via the oil tank 73, so that it is possible to stop large exhaust pressure generated at the initial stage of upward extraction of the mold by the withstanding pressure of the hydraulic cylinder device 71 and the hydraulic switching valve 72 without using the hydraulic unit. In addition, there is provided embodiments of the method for extracting poured molds using the device for extracting poured molds 1 including the electric motor 2, the driving mechanism 3 driven by the electric motor 2, the lifting frame 4 supporting the lower surface of the sand mold part SM inside the casting frame CF of the poured molds to cause thereof to be capable of lifting, the link member 5 extending in the vertical direction and provided between the driving mechanism 3 and the lifting frame 4, and the rise regulating device 7 abutting on the outer periphery of the casting frame CF to regulate rising of the casting frame CF when the lifting frame 4 is raised.

In embodiments, the method includes the shifting step of relatively shifting the sand mold part SM by the predetermined length in the vertical direction by the shifting portion (rotating portion 32) in order to separate the sand mold part SM from the casting frame CF in the adhered state in cooperation with the rise regulating device 7 at the extraction position EP where the sand mold part SM is extracted from the casting frame CF by using the driving mechanism 3, and the upward extracting step of extracting the shifted sand mold part SM upward by the upward extraction portion (rotating arm portion 33) to the conveyance position TP with a force smaller than the force of shifting by the shifting step and at the speed higher than the speed of shifting by the shifting step.

According to this, a work step is executed by dividing the extracting poured molds into the shifting portion (rotating portion 32) requiring the large force with the short stroke and the upward extraction portion (rotating arm portion 33) requiring the high speed with the long stroke, so that miniaturization of the device and improvement of the work efficiency can be achieved.

In the above embodiment, the rotating portion 32 constituting the shifting portion has a short cylindrical shape provided around the rotating drive shaft 31, but embodiments of the present invention are not limited thereto. For example, as illustrated in FIGS. 13 to 15, it may be configured in a crankshaft shape together with a rotating drive shaft 131.

In this case, two rotating portions 132 are coupled to each other by a thin shaft 140 eccentric from a rotation center 131c of a rotating drive shaft 131, and a rotating arm portion 133 forming the upward extraction portion is sandwiched from both sides. Further, locking portions 1321 are formed integrally with peripheral edge portions of the two rotating portions 132, respectively, to protrude in a radial direction. Locked portions 1331 are integral with the rotating arm portion 133, but are provided on both sides of the rotating arm portion 133 corresponding to the two locking portions 1321, respectively.

Other configurations are the same as those of the above embodiment.

Although the present invention has been disclosed in the form of embodiments and variations thereon, it will be understood that numerous additional modifications and variations could be made thereto without departing from the scope of the invention.

For the sake of clarity, it is to be understood that the use of “a” or “an” throughout this application does not exclude a plurality, and “comprising” does not exclude other steps or elements. The mention of a “unit” or a “module” does not preclude the use of more than one unit or module.

REFERENCE SIGNS LIST

• • 1 Device for extracting poured molds
  • 2 Electric motor
  • 3 Driving mechanism
  • 31 Rotating drive shaft
  • 31 a Rotation center
  • 32 Rotating portion (shifting portion)
  • 32 c Axis
  • 321 Locking portion (rotation angle regulating portion)
  • 33 Rotating arm portion (upward extraction portion)
  • 33 a Opening holding portion
  • 331 Locked portion (rotation angle regulating portion)
  • 4 Lifting frame
  • 5 Link member
  • 7 Rise regulating device
  • 71 Hydraulic cylinder device
  • 71 c Piston rod
  • 72 Hydraulic switching valve
  • 73 Oil tank
  • 73 a Oil layer
  • 73 b Air layer
  • 74 Pneumatic switching valve
  • 8 Link biasing device
  • AP Pneumatic pump
  • CF Casting frame
  • EP Device for extracting
  • L1 First link portion
  • L2 Second link portion
  • L3 Third link portion
  • L4 Fourth link portion
  • SM Sand mold part
  • TP Conveyance position

Claims

1-6. (canceled)

7. A device for extracting poured molds comprising: an electric motor:a driving mechanism including a rotating drive shaft driven by the electric motor;a lifting frame configured to support a lower surface of a sand mold part serving as an inside of a casting frame of poured molds to cause the sand mold part to be capable of lifting;a link member extending in a vertical direction and provided between the driving mechanism and the lifting frame; anda rise regulating device abutting on an outer periphery of the casting frame to regulate rising of the casting frame when the lifting frame is raised, whereinthe driving mechanism includes:a rotating drive shaft of the electric motor and a rotating arm portion, and the rotating arm portion converts rotation of the rotating drive shaft into vertical movement of the link member,wherein a rotating portion is interposed between the rotating drive shaft and the rotating arm portion, and an axis of the rotating portion is eccentric with respect to a rotation center of the rotating drive shaft,wherein a rotation radius of the rotating arm portion is larger than an amount of eccentricity of the rotating portion,wherein rotation of the rotating drive shaft is transmitted to the rotating portion at a first stage of an initial rotation of the rotating drive shaft, so that the rotating portion rotates to shift the lifting frame upward corresponding to an amount of eccentricity via the link member, and the sand mold part in a state of adhering to the casting frame is separated from the casting frame,wherein the rotation of the rotating drive shaft is transmitted to the rotating arm portion at a second stage of further rotating the rotating drive shaft, so that the rotating arm portion rotates to further extracting the lifting frame upward corresponding to the rotation radius of the rotating arm portion via the link member, and the sand mold part separated from the casting frame is moved to a conveyance position,wherein an upward extraction force at the second stage is smaller than a shifting force at the first stage, and an upward extraction speed at the second stage is faster than a shifting speed at the first stage.

8. A device for extracting poured molds comprising: an electric motor;a driving mechanism including a rotating drive shaft driven by the electric motor;a lifting frame configured to support a lower surface of a sand mold part serving as an inside of a casting frame of poured molds to cause the sand mold part to be capable of lifting;a link member extending in a vertical direction and provided between the driving mechanism and the lifting frame; anda rise regulating device abutting on an outer periphery of the casting frame to regulate rising of the molding flask when the lifting frame is raised, whereinthe driving mechanism includesa shifting portion configured to shift the lifting frame upward relatively by a predetermined length in cooperation with the rise regulating device to separate the sand mold part from the casting frame in an adhered state at an extraction position where the sand mold part is extracted from the casting frame; andan upward extraction portion configured to extract the shifted sand mold part upward to a conveyance position with a force smaller than a force of shifting by the shifting portion and at a speed higher than a speed of shifting by the shifting portion,wherein the shifting portion includes a rotating portion having a cylindrical shape and including an axis parallel to a rotation center of the rotating drive shaft, the axis being eccentric by a predetermined dimension from the rotation center of the rotating drive shaft,wherein the upward extraction portion is a rotating arm portion having a predetermined rotation radius extending in a radial direction of the rotating portion, and includes, on a base end portion side, an opening holding portion configured to hold an outer periphery of the rotating portion to be relatively rotatable, and includes, on a tip portion side, the rotating arm portion having a first link portion,wherein the link member includes, at one end, a second link portion coupled to the first link portion of the rotating arm portion in a rotatable manner, and includes, at the other end, a third link portion,wherein the lifting frame includes a fourth link portion linked to the third link portion in a rotatable manner, andwherein a rotation angle regulating portion is provided between the opening holding portion and the rotating portion wherein when the rotating portion rotates relative to the opening holding portion by a predetermined angle, the relative rotation is regulated, and the rotating portion and the rotating arm portion rotate integrally.

9. The device for extracting poured molds according to claim 8, wherein, the eccentric predetermined dimension of the shifting portion is a dimension for generating a first stroke in the vertical direction necessary for shifting the poured sand mold part in the casting frame from the inner wall of the casting frame, and at the same time, for causing the rotating portion to generate a force necessary for shifting by a rotational torque of the electric motor, anda dimension of the predetermined rotation radius of the rotating arm portion is a dimension for generating a second stroke in the vertical direction necessary for extracting the sand mold part separated from the casting frame upward.

10. The device for extracting poured molds according to claim 8, wherein a link biasing device configured to bias the link member at the time of lowering of the lifting frame, and the rotating arm portion rotates in a direction opposite to a direction at the time of rising is provided.

11. The device for extracting poured molds according to claim 8, wherein the rise regulating device includesat least a pair of hydraulic cylinders each including a piston rod capable of abutting on an outer periphery upper surface of an upper casting frame of the casting frame,an oil tank including an oil layer storing hydraulic oil and an air layer generated above the oil layer,a hydraulic switching valve provided between the oil tank and the hydraulic cylinder,a pneumatic pump configured to apply a pressure to air to feed the air, anda pneumatic switching valve provided between the pneumatic pump and the air layer of the oil tank, andwherein hydraulic oil is supplied from the oil tank to the hydraulic switching valve by an air pressure applied to the air layer of the oil tank.

12. A method for extracting poured molds using the device for extracting poured molds according to claim 7, the method comprising: by using the driving mechanism, shifting of relatively shifting the sand mold part by a predetermined length in the vertical direction to separate the sand mold part from the casting frame in an adhered state in cooperation with the rise regulating device at an extraction position where the sand mold part is extracted from the casting frame; andupward extracting of extracting the shifted sand mold part upward to a conveyance position with a force smaller than a force of shifting by the shifting and at a speed higher than a speed of shifting by the shifting without changing the rotational torque of the electric motor itself.