Patent Application
20220184691
This application claims priority benefit of Chinese Patent Application No. 202011489606.8, filed on Dec. 16, 2020, and the entire contents of which are incorporated herein by reference.
The present invention relates to the field of die casting technology and in particular to a digital full-automatic die casting apparatus.
Die casting is a precision casting method that uses high pressure to force molten metal into a complex-shaped metal mold. A die casting machine is a machine used for die casting. The die casting machine injects molten metal into a die by hydraulic pressure under the action of pressure to cool and form, and a solid metal casting can be obtained after opening the mold.
Conventional die casting machines have the following deficiencies.
(1) In the mold locking device, only the oil hydraulic cylinder is used for mold locking, with only two single actions of advancing and retreating. The oil hydraulic cylinder can not accurately position the mold locking position, resulting in inaccurate mold locking position and poor mold locking effect, which affects the stable operation of the injection action with strong injection pressure.
(2) In the injection device, the push-down mechanisms and the injection plungers of the injection mechanism are all rigidly connected, which not only easily damages the mechanical structure, but also when the mold cavity can be filled, namely, the time point when the mold cavity is filled, cannot be known; at the same time, there is no guarantee that the pressing stroke will fill the mold cavity. Thus, the degree of injection completion is reduced.
(3) When the injection device are pushed down and up for reciprocating actions to complete the injection operation, a large amount of heat will be generated, and the temperature is very high. These heat will be transmitted to the driving mechanism, which will have a great impact on the working of the driving mechanism, and is not conducive to the long-term normal working of the driving mechanism.
(4) In the material chamber of the injection device, the piston controlling the feeding is a simple piston structure only containing an inclined plane, and moves up and down completely by the air pressure without a guide structure, resulting in a phenomenon that the piston is easy to shift left and right in the process of moving up and down; at the same time, the feed inlet is sealed only by the inclined plane, with low stability.
(5) When the injection device is installed, the position is manually checked; in addition, when the injection device is replaced each time, the injection device needs to be manually installed and positioned again, which is not only time-consuming and laborious, but also causes inaccurate installation and positioning.
(6) By means of manually feeding materials into the furnace, due to the influence of human factors, the addition of materials cannot be controlled, and the addition of too much feedstocks will lead to a large drop in the temperature in the furnace, thus affecting the stability of the temperature in the furnace. In addition, the metal requirements for the temperature are very high, and the temperature drop will inevitably affect the quality of the final casting product.
In view of the above-mentioned deficiencies, it is an object of the present invention to provide a digital full-automatic die casting apparatus, each mechanism having high precision and smooth operation, and a high degree of automation, with high efficiency and high quality of cast products.
The technical solution adopted by the invention for achieving the above purpose is as follows.
A digital full-automatic die casting apparatus is characterized by comprising:
a longitudinal mounting plate;
a mold provided on a front surface of the longitudinal mounting plate;
a mold locking device comprising a plurality of mold locking mechanisms surrounding the periphery of the mold;
an injection device arranged on a back surface of the longitudinal mounting plate, wherein an injection nozzle of the injection device extends into the mold;
a PLC controller which is electrically connected to the mold locking device and the injection device respectively;
wherein the mold locking mechanism comprises a mold locking fixed-point assembly arranged on the longitudinal mounting plate, and a hydraulic mold locking assembly connected to the mold locking fixed-point assembly; the mold locking fixed-point assembly comprises a fixed-point servo motor arranged on the longitudinal mounting plate and electrically connected to the PLC controller, a fixed-point screw connected to the mold, a nut screwed to the fixed-point screw, and a transmission structure connected between the fixed-point servo motor and the nut; and the hydraulic mold locking assembly acts on the nut.
As a further improvement of the present invention, the hydraulic mold locking assembly comprises a positioning seat arranged on the longitudinal mounting plate, an oil hydraulic cylinder arranged on the positioning seat and electrically connected to the PLC controller, a locking structure arranged in the oil hydraulic cylinder and acting on the nut and/or the fixed-point screw, and a release structure arranged in the oil hydraulic cylinder and acting on the nut, wherein the nut is arranged in the positioning seat and extends into the oil hydraulic cylinder; the locking structure comprises a locking piston arranged in the oil hydraulic cylinder and located behind the nut, and a plurality of locking springs arranged between the locking piston and the nut; and the release structure comprises at least one reverse thrust sleeve sleeved around the periphery of the nut, and a plurality of reverse thrust springs arranged between the reverse thrust sleeve and the positioning seat.
As a further improvement of the present invention, an annular boss is protruded on the periphery of the nut; the locking structure is arranged behind the annular boss; the release structure is arranged in front of the annular boss; and a bearing is respectively arranged between the plurality of locking springs and the annular boss, and between the reverse thrust sleeve and the annular boss.
As a further improvement of the present invention, the transmission structure is mainly composed of a driving wheel arranged on an output shaft of the fixed-point servo motor, a driven wheel connected to the nut, and a transmission belt enclosed between the driving wheel and the driven wheel.
As a further improvement of the present invention, the mold comprises a mold mounting base arranged on a front surface of the longitudinal mounting plate, and a plurality of mold locking sliders arranged on the mold mounting base and connected to the fixed-point screw; and the injection nozzle extends through the front face of the longitudinal mounting plate and is interposed among the plurality of mold locking sliders.
As a further improvement of the present invention, the injection device comprises an injection mechanism arranged on a back surface of the longitudinal mounting plate, and a longitudinal pushing mechanism connected to the injection mechanism, wherein the longitudinal pushing mechanism comprises a longitudinal pushing mounting seat, a longitudinal pushing servo motor arranged on the longitudinal pushing mounting seat and electrically connected to the PLC controller, a driving gear connected to an output shaft of the longitudinal pushing servo motor, an eccentric structure disposed transversely on the longitudinal pushing mounting seat and engaged with the driving gear, and a longitudinal pushing structure longitudinally arranged on the longitudinal pushing mounting seat and connected to the eccentric wheel structure; and the injection mechanism comprises a furnace, an injection mounting seat arranged on the furnace, the injection nozzle inserted transversely into the injection mounting seat, and an injection pushing assembly arranged in the injection mounting seat and connected to the longitudinal pushing mechanism.
As a further improvement of the present invention, the eccentric wheel structure mainly consists of a reinforcing shaft arranged on the longitudinal pushing mounting seat, and an eccentric wheel rotatably connected to the reinforcing shaft and engaged with the driving gear, wherein the rotating shaft of the eccentric wheel is connected to the longitudinal pushing structure.
As a further improvement of the present invention, the driving gear and the eccentric wheel are cone gears.
As a further improvement of the present invention, the longitudinal pushing structure comprises a longitudinal push shaft; the rotating shaft of the eccentric wheel is connected to the longitudinal push shaft via a lateral translation structure comprising an linkage block arranged in the longitudinal push shaft and sleeved on the periphery of the rotating shaft of the eccentric wheel; and a movable cavity for lateral translation of the linkage block is formed in the longitudinal push shaft.
As a further improvement of the present invention, the lateral translation structure further comprises at least one translation slider arranged outside the longitudinal push shaft, the translation slider being connected to the linkage block and/or sleeved on the periphery of the rotating shaft of the eccentric wheel; and at least one sliding groove for lateral translation of the translation slider is formed on an outside edge of the longitudinal push shaft.
As a further improvement of the invention, the longitudinal pushing structure further comprises a buffering push shaft connected to an upper end of the injection pushing assembly; a cavity is faulted in the longitudinal push shaft; an upper end of the buffering push shaft is movably inserted into the cavity; and nitrogen or inert gas is filled in the cavity and above the buffering push shaft.
As a further improvement of the present invention, the longitudinal pushing mechanism comprises a hydraulic cylinder, a longitudinal pushing rod connected between an output shaft of the hydraulic cylinder and the injection pushing assembly, and a cooling water passage plate arranged between the hydraulic cylinder and the injection mechanism, wherein a circulating water passage set is formed in the cooling water passage plate.
As a further improvement of the present invention, the circulating water passage set comprises an upper circulating water passage, a lower circulating water passage, and a longitudinal water passage communicating with the upper circulating water passage and the lower circulating water passage, respectively.
As a further improvement of the present invention, the upper circulating water passage and the lower circulating water passage are the same, and respectively comprise a first X-axis water channel arranged on one side of the inside of the cooling water passage plate, a second X-axis water channel arranged on the other side of the inside of the cooling water passage plate, a first Y-axis water channel respectively communicating with the first X-axis water channel and the second X-axis water channel and extending from one side of the inside of the cooling water passage plate to the other side, and a second Y-axis water channel arranged on the other side of the inside of the cooling water passage plate and communicating with the second X-axis water channel, wherein one end of the first X-axis water channel, one end of the second X-axis water channel, one end of the first Y-axis water channel and one end of the second Y-axis water channel respectively extend to the outside of the cooling water passage plate.
As a further improvement of the present invention, an abdicating side groove through which the longitudinal pushing rod passes and moves up and down is formed on the cooling water passage plate.
As a further improvement of the present invention, the injection pushing assembly comprises a feeding rod arranged in the injection mounting seat and extending to a lower end surface of the injection mounting seat, an injection plunger connected to the longitudinal pushing mechanism and inserted into the feeding rod, and a feed piston movably arranged in the feeding rod and located below the injection plunger, wherein a material chamber penetrating the upper end surface and the lower end surface of the feeding rod is formed in the feeding rod, and the injection plunger and the feed piston are both movably inserted into the material chamber; and the material chamber is in communication with the injection nozzle.
As a further improvement of the present invention, the material chamber is mainly formed by an upper chamber and a lower chamber in communication; the feed piston is mainly composed of a material blocking portion movable in the upper chamber, and a guide post connected to the lower end of the material blocking portion and movable in the lower chamber, wherein an inner fitting slope is formed on an outer surface of the material blocking portion, and an outer fitting slope matching the inner fitting slope is formed on an inner wall of the upper chamber close to the lower chamber; three planes extending along the length direction of the guide post are formed on the outer side surface of the guide post; a seamed edge is formed between each adjacent two planes, the seamed edge being in contact with the inner wall of the lower chamber; the cross section of the guide post is triangular; and the guide post divides the lower chamber into three feed channels.
As a further improvement of the present invention, the injection device further comprises an automatic mold correction mechanism including a mold correction mounting base plate slidably arranged on a back surface of the longitudinal mounting plate, a lateral mold correction assembly connected to the mold correction mounting base plate, and a longitudinal mold correction assembly connected to the mold correction mounting base plate, wherein the lateral mold correction assembly comprises a lateral servo motor electrically connected to the PLC controller, a lateral linkage rod connected to the injection mounting seat, and a lateral screw connected to the lateral servo motor and screwed to the lateral linkage rod; the lateral linkage rod and the lateral screw are respectively mounted on the mold correction mounting base plate via at least one mounting block, and the lateral linkage rod and the lateral screw movably penetrate the mounting block; the longitudinal mold correction assembly comprises a longitudinal servo motor arranged on the longitudinal mounting plate and electrically connected to the PLC controller, a longitudinal linkage rod connected to the mold correction mounting base plate, and a longitudinal screw connected to the longitudinal servo motor and threaded to the longitudinal linkage rod.
As a further improvement of the present invention, it further comprises an injection locking mechanism including an electric servo cylinder electrically connected to the PLC controller, and a joint assembly connected between the servo electric cylinder and the injection device, wherein the joint assembly comprises a connecting lug connected to an output shaft of the electric servo cylinder, a joint rotating shaft arranged on the connecting lug, and a linkage plate rotatably connected to the joint rotating shaft, the linkage plate being connected to the injection device.
As a further improvement of the present invention, it further comprises an automatic loading device electrically connected to the PLC controller, the automatic loading device comprising a mounting bracket, a Y-axis moving mechanism arranged on the mounting bracket, an X-axis moving mechanism mounted on the mounting bracket and slidably arranged on the Y-axis moving mechanism, a Z-axis moving mechanism arranged on the X-axis moving mechanism, a feedstock gripping mechanism connected to the Z-axis moving mechanism, and a floating ball level gauge arranged in the furnace of the injection device and electrically connected to the PLC controller, wherein the X-axis moving mechanism, the Y-axis moving mechanism, the Z-axis moving mechanism and the feedstock gripping mechanism are respectively electrically connected to the PLC controller; the feedstock gripping mechanism comprises a mounting frame connected to the Z-axis moving mechanism, a clamping cylinder arranged on the mounting frame and electrically connected to the PLC controller, a driving rod structure connected to an output shaft of the clamping cylinder, and a material clamping structure respectively connected to the mounting frame and the driving rod structure; the material clamping structure comprises a left clamping joint and a right clamping joint rotatably connected to the mounting frame respectively, wherein the left clamping joint and the right clamping joint are cross-connected via a central rotary shaft, and the driving rod structure is connected to the central rotary shaft; the left clamping joint and the right clamping joint have the same structure, respectively comprising an upper joint rotatably connected to the mounting frame, a lower joint rotatably connected to the upper joint, and a clamping hook connected to the lower joint, wherein the lower joint is mainly composed of an upper longitudinal joint rod, a lower longitudinal joint rod, and an oblique joint rod integrally connected between the upper longitudinal joint rod and the lower longitudinal joint rod, and the central rotary shaft is inserted at a position of the oblique joint rod to rotatably connect the left clamping joint and the right clamping joint; the driving rod structure comprises a connecting block connected to the output shaft of the clamping cylinder, and two driving rods connected to two ends of the connecting block and respectively connected to the central rotary shaft; the Y-axis moving mechanism comprises a Y-axis servo motor arranged on one end of the mounting bracket and electrically connected to the PLC controller, a Y-axis driving wheel connected to the output shaft of the Y-axis servo motor, a Y-axis driven wheel arranged on the other end of the mounting bracket, a Y-axis transmission belt surrounding the periphery of the Y-axis driving wheel and the Y-axis driven wheel, and at least one Y-axis sliding rail arranged on the mounting bracket and extending along the length direction of the Y-axis transmission belt; the X-axis moving mechanism comprises an X-axis base plate slidingly arranged on a Y-axis sliding rail via at least one X-axis slider, an X-axis servo motor arranged on one end of the X-axis base plate and electrically connected to the PLC controller, an X-axis driving wheel connected to an output shaft of the X-axis servo motor, an X-axis driven wheel arranged on the other end of the X-axis base plate, an X-axis transmission belt surrounding the periphery of the X-axis driving wheel and the X-axis driven wheel, and at least one X-axis sliding rail arranged on the X-axis base plate and extending along the length direction of the X-axis transmission belt, wherein the X-axis base plate is connected to the Y-axis transmission belt via an X-axis clamping block; the Z-axis moving mechanism comprises a Z-axis base plate slidingly arranged on the X-axis sliding rail via at least one Z-axis slider, a Z-axis electric servo cylinder arranged on the Z-axis base plate and electrically connected to the PLC controller, and a Z-axis driving shaft connected between the output shaft of the Z-axis electric servo cylinder and the mounting frame of the feedstock gripping mechanism, wherein the Z-axis base plate is connected to the X-axis transmission belt via a Z-axis clamping block.
The invention has the following beneficial effects.
(1) By using the fixed-point servo motor of the mold locking fixed-point assembly of the mold locking mechanism to accurately position the mold closing position, it not only has high accuracy, but also the fixed-point servo motor can perform any opening and closing actions, fixed-point actions, repeated actions, multi-stage fixed-point actions and other opening and closing or fixed-point actions which are more complex for different molds, and thus can perform more, more complex and more diversified actions. Moreover, the mold after the point fixed is completely locked by the hydraulic mold locking assembly, with large oil pressure and higher mold locking stability. Therefore, the combination of the mold locking fixed-point assembly and the hydraulic mold locking assembly can achieve the purpose of accurate positioning and mold closing, and complete stability of the mold locking, and facilitate the subsequent completion of the injection action with strong injection pressure.
(2) By the special structure design of the longitudinal pushing mechanism in the injection device, the eccentric wheel structure is driven to rotate by the longitudinal pushing servo motor. During the rotation of the eccentric wheel structure, the longitudinal pushing structure is driven to move up and down by the eccentric action of the eccentric wheel structure, i. e. the longitudinal pushing structure can perform a stable push-down and pull-up reciprocating action so as to facilitate the stable operation of the injection. The special structure design of the lateral translation structure provides a transverse stroke space for the rotating shaft of the eccentric wheel, so that the rotating shaft of the eccentric wheel can be transversely displaced, without applying a transverse force to the longitudinal push shaft, but only applying a longitudinal force. Therefore, the longitudinal push shaft can always stably perform a push-down and pull-up reciprocating motions, so as to facilitate the stable performance of the injection plunger actions.
(3) By adding a cooling water passage plate between the hydraulic cylinder and the injection mechanism of the injection device, a special structure design of a circulating water passage set is formed by combining an upper circulating water passage, a lower circulating water passage and a longitudinal water passage in the cooling water passage plate, achieving that the water passage is distributed in the cooling water passage plate; and by introducing water into the water passage, the water circulates in the water passage, so that the water can play a cooling role, thereby cooling the upward heat generated when the injection mechanism works, which effectively isolates and cools the heat and prevents the heat on the injection mechanism from being transferred to the hydraulic cylinder, thereby enabling the hydraulic cylinder to maintain a normal temperature. The hydraulic cylinder can operate normally for a long time without being affected.
(4) The flexible buffering push mechanism, which is composed of the buffering push shaft and nitrogen or inert gas filled in the cavity, can not only reduce mechanical damage and increase injection pressure, but also play a buffering role and provide an action balancing force for the whole action process. Specifically, since the buffer function is performed by using the nitrogen or inert gas, the downward stroke of the longitudinal push shaft can be increased in advance. When the pressing stroke is increased, not only the air pressure inside the cavity can be increased to increase the injection pressure, but also the mold cavity can be filled. After the mold cavity is filled, due to the buffering effect of nitrogen or inert gas, the buffering push shaft can automatically move upward and backward to balance the up-and-down movement force of the buffering push shaft, without jamming. In this way, it is ensured that the mold cavity has been filled with a certain degree of saturation, without the problem of saturation deficit due to action accuracy errors or stroke errors.
(5) The feed piston in the material chamber is composed of a material blocking portion and a guide post with a special structural design, and its stability is significantly improved compared with the traditional piston structure with only an inclined plane. Specifically, the guide post has a triangular cross section; according to the principle of keeping the center stable in a circle by three points, the guide action of the guide post can make the feed piston move up and down smoothly in the upper chamber and the lower chamber, and reduce the offset. It can be seen therefrom that the guide post plays a guiding role in the up-and-down movement of the feed piston, improves the stability of the up-and-down movement of the feed piston, and facilitates the smooth and stable sealing between the inner fitting slope of the material blocking portion and the outer fitting slope of the upper chamber.
(6) By using an automatic mold correction mechanism to correct a mold of an injection device, and after a set of injection device is mounted on a longitudinal mounting plate, the position of the injection device is adjusted, and position information data of the injection device is automatically stored in a PLC controller; when a set of injection device is replaced, the PLC controller calls out the position information data, the lateral servo motor is combined with the longitudinal servo motor, and the lateral and longitudinal positions of the injection device are automatically adjusted, so as to complete the mold correction operation and achieve the purpose of automatic mold setup, thereby facilitating the replacement and assembly of the injection device, which not only saves time and effort, but also provides accurate installation and positioning.
(7) The automatic loading device is used to complete the loading operation. An X-axis moving mechanism, a Y-axis moving mechanism and a Z-axis moving mechanism respectively drive the feedstock gripping mechanism to move on the X-axis, the Y-axis and the Z-axis, so that the feedstock gripping mechanism can continuously and uniformly load multiple feedstocks into the furnace, and realize the purpose of grasping the feedstocks at different positions at fixed points and transferring same into the furnace, with high efficiency, labor saving and low cost.
(8) In the automatic loading device, the material level in the furnace is sensed in real time by the floating ball level gauge before the loading action is performed, a floating ball level gauge transmits the level information to the PLC controller, and the PLC controller controls the loading to the furnace. Specifically, when the floating ball level gauge senses that the level of the material in the furnace has dropped, the PLC controller can control the loading operation to be completed. When the level has dropped, the corresponding material is loaded accordingly; and the loading amount is just right, so that the level of the material in the furnace is maintained to a set state. As a result, a sharp drop in temperature due to excessive charging does not occur, and the temperature of the material in the furnace can be ensured to be stable, which is beneficial for improving the quality of castings.
(9) The whole machine uses a plurality of servo mechanisms to accurately control each action, which not only has high accuracy, but also can accurately control the stroke of servo mechanisms by programming. In addition, compared with an ordinary oil pressure motor, the power source must be always on to have electricity, and there is a problem of large power consumption. The electric motor of the servo mechanism is powered only when it is started; the power consumption is low, and it saves power and reduces personnel and costs. At the same time, it does not cause oil leakage and noise appearing on the ordinary oil pressure motor.
The above is an overview of the technical scheme of the invention. The following is a further explanation of the invention in combination with the attached drawings and specific implementations.
In order to further explain the technical means and effects of the present invention for achieving the intended purpose, the following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings and preferred embodiments.
Referring to
a longitudinal mounting plate 1;
a mold 2 provided on the front surface of the longitudinal mounting plate 1;
a mold locking device 3 comprising a plurality of mold locking mechanisms 31 surrounding the periphery of the mold 2;
an injection device 4 arranged on a back surface of the longitudinal mounting plate 1, wherein an injection nozzle an injection nozzle 40 of the injection device 4 extends to the mold 2, after the mold locking action is completed by the mold locking mechanism 31, the injection action is completed by the injection device 4;
a PLC controller 5 electrically connected to the mold locking device 3 and the injection device 4 respectively;
wherein the mold locking mechanism 31 comprises a mold locking fixed-point assembly 311 arranged on the longitudinal mounting plate 1, and a hydraulic mold locking assembly 312 connected to the mold locking fixed-point assembly 311; the mold locking fixed-point assembly 311 comprises a fixed-point servo motor 3111 arranged on the longitudinal mounting plate 1 and electrically connected to the PLC controller 5, a fixed-point screw 3112 connected to the mold 2, a nut 3113 screwed to the fixed-point screw 3112, and a transmission structure 3114 connected between the fixed-point servo motor 3111 and the nut 3113; and the hydraulic mold locking assembly 312 acts on the nut 3113. When the fixed-point servo motor 3111 provides a rotational driving force, and the transmission structure 3114 transmits the driving force to drive the nut 3113 to rotate, the fixed-point screw 3112 screwed with the nut 3113 can push the mold 2 to perform a mold closing or mold opening action. Specifically, the fixed-point servo motor 3111 drives the nut 3113 to rotate in the forward direction, the fixed-point screw 3112 pushes forward, and the mold 2 closes; on the contrary, the fixed-point servo motor 3111 drives the nut 3113 to rotate in the reverse direction, the fixed-point screw 3112 retreats, and the mold 2 opens.
By using the fixed-point servo motor 3111 of the mold locking fixed-point assembly 311 to accurately position the mold closing position, it not only has high accuracy, but also the fixed-point servo motor 3111 can perform any opening and closing actions, fixed-point actions, repeated actions, multi-stage fixed-point actions and other opening and closing or fixed-point actions which are more complex for different molds, and thus can perform more, more complex and more diversified actions. Then, the mold 2 after the point fixed is completely locked by the hydraulic mold locking assembly 312, with large oil pressure and higher mold locking stability. Therefore, the combination of the mold locking fixed-point assembly 311 and the hydraulic mold locking assembly 312 can achieve the purpose of accurate positioning and mold closing, and complete stability of the mold locking.
In this embodiment, as shown in
Specifically, the locking structure 3123 includes a locking piston 31231 arranged in the oil hydraulic cylinder 3122 behind the nut 3113, and a plurality of locking springs 31232 arranged between the locking piston 31231 and the nut 3113. The oil pressure of the oil hydraulic cylinder 3122 drives the locking piston 31231 to act on the nut 3113, so that the nut 3113 moves a short stroke in the direction of the mold 2 to absorb the deformation of the mechanical structure. Thus, the nut 3113 and the fixed-point screw lock the mold 2, achieving the purpose of completely locking the mold, so as to facilitate the subsequent injection operation. At the same time, the locking spring 31232 is compressed. When it is necessary to open the mold after the injection is completed, the oil pressure of the oil hydraulic cylinder 3122 is lost, and the elastic restoring force of the locking spring 31232 acts on the locking piston 31231, so that the locking piston 31231 retreats.
Specifically, the release structure 3124 includes at least one reverse thrust sleeve 31241 sleeved around the periphery of the nut 3113, and a plurality of reverse thrust springs 31242 arranged between the reverse thrust sleeve 31241 and the positioning seat 3121. As the locking piston 31231 moves the nut 3113 a short stroke in the direction of the mold 2, the reverse thrust spring 31242 is compressed. However, during the mold opening process, after the locking piston 31231 retreats, the elastic restoring force of the reverse thrust spring 31242 acts on the reverse thrust sleeve 31241 and the nut 3113, so that the nut 3113 retreats to a position at a point fixed by the mold locking fixed-point assembly 311 to facilitate the reverse driving of the mold locking fixed-point assembly 311 to complete the mold opening action of the mold 2.
In order to facilitate the application of a force on the nut 3113 and achieve the locking and releasing action on the nut 3113, this embodiment is provided with an annular boss 31131 protruding on the periphery of the nut 3113; the locking structure 3123 is provided behind the annular boss 31131; the release structure 3124 is provided in front of the annular boss 31131; and a bearing 3125 is respectively provided between the plurality of locking springs 31232 and the annular boss 31131, and between the reverse thrust sleeve 31241 and the annular boss 31131. The provision of the bearing 3125 can reduce the axial friction force and the radial friction force when the nut 3113 acts, thereby improving the speed and accuracy of the action of the nut 3113.
In this embodiment, as shown in
In the present embodiment, as shown in
In the present embodiment, as shown in
The driving gear 423 is driven to rotate by the longitudinal pushing servo motor 422, and then the eccentric wheel structure 424 meshed with the driving gear 423 is driven to rotate; and by the eccentric action of the eccentric wheel structure 424, the longitudinal pushing structure 425 is driven to move up and down during the rotation of the eccentric wheel structure 424, namely, the longitudinal pushing structure 425 performs push-down and pull-up reciprocating actions, thereby driving the injection pushing assembly 413 of the injection mechanism 41 to perform the push-down and pull-up reciprocating actions, so that the feedstock in the furnace 411 is injected into the mold 2 by the injection nozzle 40 to complete the injection operation. Specifically, the feedstock in the furnace 411 may be a metal such as zinc, aluminum, or magnesium.
In the present embodiment, specifically, as shown in
By the reinforcing action of the reinforcing shaft 4241, there is no longitudinal or during the rotation of the eccentric wheel 4242 during the rotation of the eccentric wheel 4242, so that the eccentric wheel 4242 can stably rotate with the drive by the driving gear 423, thereby stably driving the longitudinal pushing structure 425 to perform push-down and pull-up reciprocating action.
When the eccentric wheel 4242 rotates, that is, the rotating shaft 42420 of the eccentric wheel 4242 rotates, the rotating shaft 42420 undergoes both longitudinal displacement and lateral displacement. Therefore, it is ensured that the rotating shaft 42420 of the eccentric wheel 4242 only drives the longitudinal pushing structure 425 for a longitudinal displacement, but not a lateral displacement. This embodiment optimizes the design of the longitudinal pushing structure 425. Specifically, as shown in
In order to improve the lateral translation stability of the rotating shaft 42420 of the eccentric wheel 4242, as shown in
Thus, by the design of the lateral translation structure 4252, a lateral stroke space is provided for the rotating shaft 42420 of the eccentric wheel 4242, so that the rotating shaft 42420 of the eccentric wheel 4242 can be laterally displaced without applying a lateral force to the longitudinal push shaft 4251, but only applying a longitudinal force. Therefore, the longitudinal push shaft 4251 can always perform push-down and pull-up reciprocating actions.
In order to increase the injection pressure and reduce the mechanical structure damage when the injection mechanism 41 is driven for the injection action by the longitudinal pushing mechanism 42, as shown in
In this embodiment, the flexible buffering push mechanism, which is composed of the buffering push shaft 4253 and the nitrogen or inert gas filled in the cavity 42512, can not only increase the injection pressure, but also play a buffering role provide an action balancing force for the whole action process.
Specifically, since the buffer function is performed by using the nitrogen or inert gas, the downward stroke of the longitudinal push shaft 4251 can be increased in advance. When the pressing stroke is increased, not only the air pressure inside the cavity 42512 can be increased to increase the injection pressure, but also the mold cavity can be filled. After the mold cavity is filled, due to the buffering effect of nitrogen or inert gas, the buffering push shaft 4253 can automatically move upward and backward to balance the up-and-down movement force of the buffering push shaft 4253, without jamming. In this way, it is ensured that the mold cavity has been filled with a certain degree of saturation, without the problem of saturation deficit due to action accuracy errors or stroke errors.
In the present embodiment, as shown in
Specifically, the material chamber 41310 is mainly formed by an upper chamber 413101 and a lower chamber 413102 in communication; the feed piston 4133 is mainly composed of a material blocking portion 41331 movable in an upper chamber 413101, and a guide post 41332 connected to the lower end of the material blocking portion 41331 and movable in the lower chamber 413102, wherein an inner fitting slope 413311 is formed on an outer surface of the material blocking portion 41331, and an outer fitting slope 4131011 matching the inner fitting slope 413311 is formed on the inner wall of the upper chamber 413101 close to the lower chamber 413102. As shown, in
When the injection plunger 4132 is pushed down by the longitudinal pushing structure 425, the air pressure inside the upper chamber 413101 and between the injection plunger 4132 and the feed piston 4133 increases, so that the feed piston 4133 is pushed down by the internal air pressure, and the feed piston 4133 moves down until the inner fitting slope 413311 of the material blocking portion 41331 fits and seals with the outer fitting slope 4131011 of the upper chamber 413101, namely, the material blocking portion 41331 blocks a feeding port between the upper chamber 413101 and the lower chamber 413102, so that the material in the furnace 411 does not enter inside from the lower chamber 413102. At the same time, the downward movement of the injection plunger 4132 causes the material in the upper chamber 413101 to pass through the channel 4120 and be injected by the injection nozzle 40 to complete the injection operation in the mold 2. When the injection plunger 4132 is driven to move upwards by the longitudinal pushing structure 425, the vacuum pressure inside the upper chamber 413101 makes the feed piston 4133 move upwards, and then the feeding port between the upper chamber 413101 and the lower chamber 413102 changes from a blocked state to an opened state; and the feeding process is completed by the vacuum pressure in the upper chamber 413101, so that the material in the furnace 411 is sucked into the upper chamber 413101 from the three feeding channels 413321. By repeating the above-mentioned actions, the feeding and injection operations can be completed.
The feed piston 4133 in the present embodiment is composed of a material blocking part 41331 and a guide post 41332 with a special structural design, and its stability is significantly improved compared with the conventional piston structure with only an inclined plane. Specifically, the guide post 41332 has a triangular cross section; according to the principle of keeping the center stable in a circle by three points, the guide action of the guide post 41332 can make the feed piston 4133 move up and down smoothly in the upper chamber 4133 and the lower chamber 413102, and reduce the offset. It can be seen therefrom that the guide post 41332 plays a guiding role in the up-and-down movement of the feed piston 4133, improves the stability of the up-and-down movement of the feed piston 4133, and facilitates the smooth and stable sealing between the inner fitting slope 413311 of the material blocking portion 41331 and the outer fitting slope 4131011 of the upper chamber 413101.
In order to enable the injection nozzle 40 to perform an injection action more stably, the present embodiment further comprises an injection locking mechanism 6. As shown in
The joint assembly 62 is driven by an electric servo cylinder 61 so as to lock the injection device 4 during injection. The electric servo cylinder 61 has the advantages of accurate speed, position and thrust control of the servo motor. Furthermore, the rotational motion of the servo motor is converted into a linear motion, i. e. the rotational force path is changed into a linear force path, and the stability is higher.
In order to facilitate the replacement and assembly of the injection device 4, the injection device 4 according to the present embodiment further includes an automatic mold correction mechanism 43, which, as shown in
Specifically, the lateral mold correction assembly 432 comprises a lateral servo motor 4321 electrically connected to the PLC controller 5, a lateral linkage rod 4322 connected to the injection mounting seat 412, and a lateral screw 4323 connected to the lateral servo motor 4321 and screwed to the lateral linkage rod 4322; the lateral linkage rod 4322 and the lateral screw 4323 are respectively mounted on the mold correction mounting base plate 431 via at least one mounting block 4324; and the lateral linkage rod 4322 and the lateral screw 4323 penetrate through the mounting block 4324. The lateral screw 4323 is rotated by the lateral servo motor 4321, so that the lateral linkage rod 4322 screwed with the lateral screw 4323 performs a lateral translation action, thereby adjusting the lateral position of the injection mounting seat 412.
Specifically, the longitudinal mold correction assembly 433 includes a longitudinal servo motor 4331 arranged on the longitudinal mounting plate 1 and electrically connected to the PLC controller 5, a longitudinal linkage rod 4332 connected to the mold correction mounting base plate 431, and a longitudinal screw 4333 connected to the longitudinal servo motor 4331 and screwed to the longitudinal linkage rod 4332. The longitudinal screw 4333 is rotated by the longitudinal servo motor 4331, so that the longitudinal linkage rod 4332 screwed with the longitudinal screw 4333 moves longitudinally, thereby adjusting the longitudinal position of the injection mounting seat 412.
After a set of injection device 4 is mounted on the longitudinal mounting plate 1, the position of the injection device 4 is adjusted, and position information data of the injection device 4 is automatically stored in the PLC controller 5. When a set of injection device 4 is replaced, the PLC controller 5 calls out the position information data, the lateral servo motor 4321 is combined with the longitudinal servo motor 4331, and the lateral and longitudinal positions of the injection device are automatically adjusted, so as to complete the mold correction operation and achieve the purpose of automatic mold setup, thereby facilitating the replacement and assembly of the injection device 4.
In the present embodiment, an automatic loading device 7 electrically connected to the PLC controller 5 is further included. As shown in
Specifically, as shown in
When the driving rod structure 753 moves downwards by the drive of the clamping cylinder 752, the central rotary shaft 7543 moves downwards by the drive of two driving rods 7532 of the driving rod structure 753, and then the central rotary shaft 7543 simultaneously applies a downward acting force to the left clamping joint 7541 and the right clamping joint 7542; since the upper ends of the upper joints 75411 of the left clamping joint 7541 and the right clamping joint 7542 are rotatably arranged on the mounting frame 751, the ends of the upper joints 75411 connected to the lower joints 75412 are urged to swing inwards; namely, the lower end portions of the upper joints 75411 of the left clamping joint 7541 and the right clamping joint 7542 drive the upper longitudinal joint rods 754121 of the lower joint 75412 to approach inwards, and then the lower joints 75412 of the left clamping joint 7541 and the right clamping joint 7542 both rotate around the central rotating shaft 7543, thereby making the left clamping joint 7541 and the lower longitudinal joint rods 754122 of the lower joints 75412 of the right clamping joint 7542 approach, namely, the clamping hooks 75413 of the left clamping joint 7541 and the right clamping joint 7542 approach and close to clamp the material.
Then, the X-axis moving mechanism 73, the Y-axis moving mechanism 72, and the Z-axis moving mechanism 74 cooperate to move the feedstock on the feedstock gripping mechanism 75 into the furnace 411.
Then, the driving rod structure 753 moves upwards by the drive of the clamping cylinder 752, and the central rotary shaft 7543 moves upwards by the drive of two driving rods 7532 of the driving rod structure 753, and then the central rotary shaft 7543 simultaneously applies an upward acting force to the left clamping joint 7541 and the right clamping joint 7542; since the upper ends of the upper joints 75411 of the left clamping joint 7541 and the right clamping joint 7542 are rotatably arranged on the mounting frame 751, the ends of the upper joints 75411 connected to the lower joints 75412 are urged to swing outwards; namely, the lower end portions of the upper joint 75411 of the left clamping joint 7541 and the right clamping joint 7542 drive the upper longitudinal joint rods 754121 of the lower joint 75412 to open and separate outwards, and then the lower joints 75412 of the left clamping joint 7541 and the right clamping joint 7542 both rotate around the central rotary shaft 7543, thereby separating the left clamping joint 7541 from the lower longitudinal joint rod 754122 of the lower joint 75412 of the right clamping joint 7542, namely, the clamping hooks 75413 of the left clamping joint 7541 and the right clamping joint 7542 are opened away from each other to loosen the feedstocks and place the feedstocks into the furnace 411 so as to complete the loading operation.
In this embodiment, as shown in
Meanwhile, the X-axis moving mechanism 73 comprises an X-axis base plate 731 slidingly arranged on the Y-axis sliding rail 725 via at least one X-axis slider 730, an X-axis servo motor 732 arranged on one end of the X-axis base plate 731 and electrically connected to the PLC controller 5, an X-axis driving wheel 733 connected to the output shaft of the X-axis servo motor 732, an X-axis driven wheel 734 arranged on the other end of the X-axis base plate 731, an X-axis transmission belt 735 surrounding the periphery of the X-axis driving wheel 733 and the X-axis driven wheel 734, and at least one X-axis sliding rail 736 arranged on the X-axis base plate 731 and extending along the length of the X-axis transmission belt 735; and the X-axis base plate 731 is connected to the Y-axis transmission belt 724 by an X-axis clamping block 737. The driving force provided by the X-axis servo motor 732 drives the X-axis transmission belt 735 to move on the X-axis in cooperation with the X-axis driving wheel 733 and the X-axis driven wheel 734.
Since the X-axis base plate 731 is slidably arranged on the Y-axis sliding rail 725 via the X-axis slider 730, and is connected to the Y-axis transmission belt 724 via the X-axis clamping block 737, the Y-axis moving mechanism 72 can drive the X-axis moving mechanism 73, the Z-axis moving mechanism 74 and the feedstock gripping mechanism 75 to integrally move in the Y-axis direction.
Meanwhile, the Z-axis moving mechanism 74 includes a Z-axis base plate 741 slidingly arranged on the X-axis sliding rail 736 via at least one Z-axis slider 740, a Z-axis servo cylinder 742 arranged on the Z-axis base plate 741 and electrically connected to the PLC controller 5, and a Z-axis driving shaft 743 connected between the output shaft of the Z-axis servo cylinder 742 and the mounting bracket 751 of the feedstock gripping mechanism 75, the Z-axis base plate 741 being connected to the X-axis transmission belt 735 via a Z-axis clamping block 744. The Z-axis servo cylinder 742 provides the driving force to move the material gripping mechanism 75 in the Z axis.
Since the Z-axis base plate 741 is slidably arranged on the X-axis sliding rail 736 via the Z-axis slider 740, and is connected to the X-axis transmission belt 735 via the Z-axis clamping block 744, the Z-axis moving mechanism 74 and the feedstock gripping mechanism 75 as a whole can be moved in the X-axis direction by the X-axis moving mechanism 73.
Before the loading action is performed, a floating ball level gauge senses the liquid level of the material in the furnace 411 in real time, the floating ball level gauge transmits the liquid level information to the PLC controller 5, and then the PLC controller 5 controls the feedstock gripping mechanism 75, the X-axis moving mechanism 73, the Y-axis moving mechanism 72 and the X-axis moving mechanism 73 to perform an action so as to load the material into the furnace 411. Specifically, when the floating ball level gauge senses that the level of the material in the furnace 411 has dropped, the PLC 5 controller can control the loading operation to be completed. When the level has dropped, the corresponding material is loaded accordingly; and the loading amount is just right, so that the level of the material in the furnace 411 is maintained to a set state. As a result, a sharp drop in temperature due to excessive charging does not occur, and the temperature of the material in the furnace 411 can be ensured to be stable, which is beneficial for improving the quality of castings.
The main differences between this embodiment and Embodiment 1 are as follows. As shown in
In this embodiment, as shown in
A special structure design of a circulating water passage set 4280 is formed by combining an upper circulating water passage 42801, a lower circulating water passage 42802 and a longitudinal water passage 42803, achieving that the water passage is distributed in the cooling water passage plate 428; and by introducing water into the water passage, the water circulates in the water passage, so that the water can play a cooling role, thereby cooling the upward heat generated when the injection mechanism 41 works, which effectively isolates and cools the heat and prevents the heat on the injection mechanism 41 from being transferred to the hydraulic cylinder 426, thereby enabling the hydraulic cylinder 426 to maintain a normal temperature. The hydraulic cylinder 426 can operate normally for a long time without being affected.
In order to facilitate the push-down and pull-up reciprocating actions of the longitudinal pushing rod 427 driven by the hydraulic cylinder 426, an abdicating side groove 4281 through which the longitudinal pushing rod 427 passes and moves up and down is formed on the cooling water passage plate 428 in the present embodiment, as shown in
In the description above, only the preferred embodiments of the present invention has been described, and the technical scope of the present invention is not limited in any way. Therefore, other structures obtained by adopting the same or similar technical features as those of the above embodiments of the present invention are within the scope of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202011485966.0 | Dec 2020 | CN | national |
