TECHNICAL FIELD
The present invention belongs to the technical field of cutting tools, and particularly relates to a cutting device of a self-centering cutter holder.
BACKGROUND
A cold milling machine, referred to as a road pulverizer or a road turning machine sometimes, is generally a machine that includes a framework supported on all four sides by a crawler type or wheel type drive unit. The framework is used to install an engine, an operator station and a milling drum. The surface of a road is pulverized by the engine that rotates the milling drum equipped with a cutting tool through a suitable interconnection.
Such a machine is generally a machine with a working roller that is driven and can rotate about a horizontal axis, on which a plurality of ground processing tools, particularly shearing blocks or chisels, and particularly round bar chisels are arranged.
In an actual cutting process, the milling drum rotates rapidly and continuously to cut off the damaged ground. In such a reciprocating cutting-off process, several replaceable supports installed on the milling drum are regularly subjected to such a working condition with a high frequency, large impact force and strong vibration. Under such a harsh working condition, combinations of the replaceable supports and the base are liable to have changes, for example, misalignment, loose separation and so on. When analyzing the reasons for similar situations, we found that the replaceable supports had variable degrees of freedom and instability in the assembly positioning with the base, which greatly affected quality of pavement construction; and moreover, construction work needed to be interrupted so as to repair or reassemble the separated and missing replaceable supports.
The main components of such a replaceable support system include replaceable supports provided with a processing tool of the base part and connected to the base part. In particular, the replaceable supports can be formed integrally with the processing tool or can also have appropriate tool containing parts configured to contain tools for ground processing, such as chisels, particularly round bar chisels. The base part is firmly fixed, for example, by being fixed to the cylindrical outer surface of a supporting turning roller, particularly by fixing and welding the base part onto a roller body. The base part constitutes a connecting element of the replaceable support system and a roller base body. Although the conventional quick-to-change tool holder system has proved successful in principle, it still needs improvement, which particularly involves the replacement of processing tools and/or quick-to-change tool holders and the reliability and service life of the entire quick-to-change tool holder system. For example, the assembly surfaces of the replaceable supports and the base are worn and deformed due to repeated impact force, so the purpose of fastening each other cannot be achieved, that is, the entire replaceable support system can no longer be used.
SUMMARY
The objective of the present invention is to provide a cutting device of a self-centering cutter holder.
Another objective of the present invention is to provide a cutting device capable of independently generating a clamping force during use, which greatly prolongs the service life of the whole machine.
To solve the technical problems, the present invention discloses a cutting device of a self-centering cutter holder, which is applied on a ground processing machine. The cutting device 1 includes a cutter holder 2 and a base body 3, where the cutter holder 2 is provided with a main body 210, a cutter mounting part 22 is arranged in a machining side area at the upper part of the main body 210, an extension handle part 202 is arranged at a fixed part side at the lower part of the main body 210, the extension handle part 202 is at least partially connected to a pressing surface 28 at the lower side of the main body 210, the extension handle part 202 is provided with a supporting surface 203 and a central axis L, and a surface plain line 206 of the supporting surface 203 forms an angle around the central axis L.
A containing part 30 is arranged on the upper end surface of the base body 3; the containing part is a concave surface adaptive to the extension handle part 202 in shape; and the cutter holder 2 is mounted in the containing part 30 of the base body 3 through the extension handle part 202.
The containing part 30 and the extension handle part 202 are coaxially arranged, so that the cutter holder 2 can rotate through the containing part 30 of the base body 3.
The angle a is an acute angle, preferably ranging from 5 degrees to 15 degrees.
The extension handle part 202 is in the shape of a semi-cone with a diameter gradually reduced from top to bottom.
A ratio of the top diameter x of the extension handle part 202 to a bottom diameter y of the extension handle part 202 is 1.1-2.
The diameter x is 50-60 mm, and the diameter y is 35-45 mm.
The cutter mounting part 22 of the cutter holder 2 is provided with a central axis L0; the central axis L and the central axis L0 are distributed in a virtual plane M, namely a symmetrical plane of the cutter holder 2.
The central axis L0 of the cutter mounting part 22 and the central axis L of the extension handle part 202 form an included angle c ranging from 130 degrees to 140 degrees on the symmetrical plane M.
The edge of the pressing surface 28 is equipped with a dismounting part 23 with a pit, and the dismounting part is used as a standby part for dismounting the cutter holder 2.
The cutting device of the self-centering cutter holder at least has the following advantages:
According to the cutting device of the self-centering knife rest disclosed by the present invention, the cutter holder is mounted in the containing part of the base body through the extension handle part, and can independently generate fastening force to fix the cutter holder and the base body together accordingly, so that the reliability of the whole cutting device is greatly improved, the service life of the whole cutting device is greatly prolonged, and meanwhile, the production cost is reduced.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is an overall view of the left rear of a cutting device of a quick-change cutter holder of the present invention;
FIG. 2 is an exploded view of the left rear of a cutting device of a quick-change cutter holder of the present invention;
FIG. 3 is an exploded view of the right front of a cutting device of a quick-change cutter holder of the present invention;
FIG. 4 is a top perspective view of the left rear side of a cutter holder of a cutting device of a quick-change cutter holder of the present invention;
FIG. 5 is a left side front view of a cutter holder of a cutting device of a quick-change cutter holder of the present invention;
FIG. 6 is a bottom elevation view of a cutter holder of a cutting device of a quick-change cutter holder of the present invention;
FIG. 7 is a front side view, cut according to a mid-plane M of the FIG. 6, of a cutter holder of a cutting device of a quick-change cutter holder of the present invention;
FIG. 8 is a plan front view of a base body of a cutting device of a quick-change cutter holder of the present invention;
FIG. 9 is a front side view, cut according to a mid-plane M1 of the FIG. 8, of a base body of a cutting device of a quick-change cutter holder of the present invention;
FIG. 10 is a front overall view of a cutting device of a quick-change cutter holder of the present invention;
FIG. 11 is a cross section view of the FIG. 10, of a cutting device of a quick-change cutter holder of the present invention; and
FIG. 12 is a D-D cross section view of the FIG. 10, of a cutting device parts 4 and 5 of a quick-change cutter holder of the present invention.
FIG. 13 is a partial cross-sectional view and a front view of the fastening part of the cutting device of the present invention.
DETAILED DESCRIPTION OF THE EMBODIMENTS
The present invention will be further described in detail through embodiments, so that a person skilled in the art can implement by referring to the text of the specification.
It should be understood that the terms such as “having”, “containing”, and “including” as used herein do not preclude the presence or addition of one or more other elements or combinations thereof.
As shown in FIG. 1, a base body 3, a cutter holder 2, a locking part 4 and a fastening part 5 constitute up a cutting device 1, and the cutter holder 2 can be connected to the base body 3 in a replaceable mode. A connecting surface 3.1 which is in a sunken arched state is provided below the base body 3, and the dimension of the arch is defined by the outer diameter of a milling drum. As a result, the base body 3 can be mounted on the outer surface of the milling drum through the connecting surface 3.1, and can be fixedly welded thereon.
As shown in FIG. 2 to FIG. 4, the cutter holder 2 is mounted in a containing part 30 of the base body 3 through an extension handle part 202; a fastening part 5 penetrates into a blind hole 33 of the base body 3, and the locking part 4, which may be a screw, passes through a through hole of the cutter holder 2, a blind hole 34 of the base body 3; after inner threads 50 of the fastening part 5 and outer threads 41 of the locking part 4 are properly adjusted to be aligned, tools such as a wrench can be inserted into an adaptive hole 40 of the locking part 4, and can rotate clockwise, so that the locking part 4 is gradually screwed into the inner threads 50 of the fastening part 5; under a proper torque, the locking surface 42 of the locking part 4 tightly fits to a counter bore surface 205.1 of the cutter holder 2, and a pressing surface 28 of the cutter holder 2 fits to a stress surface 37 of the base body 3; a pressure surface 29 of the cutter holder 2 fits to an attaching surface 36 of the base body 3; and a transition surface 200 of the cutter holder 2 and an auxiliary surface 38 of the base body 3 are not attached, and are kept with a proper gap.
As shown in FIG. 2 and FIG. 3, a working surface is arranged in front of a main body 210 of the cutter holder 2, where the working surface including a discharge surface 25, a discharge surface 26 and a discharge surface 27, the discharge surface 25 being at the forefront, the discharge surface 25 and the discharge surface 26 being arranged at an included angle, and the discharge surface 25 and the discharge surface 27 being arranged at an included angle. The three defines an arrow-shaped geometric shape with the effects of protecting the base body 3 and reducing cutting resistance in work. The front of the base body 3 is provided a raised portion, including a forefront surface 301, side surfaces 300, surfaces 302, 303, and 304, which are also arranged with included angles, and achieve a better space effect when arranged and welded in front and rear of the base body 3.
As shown in FIG. 6 and FIG. 6, the through hole 204 of the cutter holder 2 passes through the pressing surface 28, the pressure surface 29 and the transition surface 200; and a counter bore 205 passes through the transition surface 200 and is locally crossed with the pressure surface 29.
FIG. 5 shows that the extension handle part 202 is provided with a supporting surface 203 and a central axis L, where the supporting surface 203 extends in a direction away from the main body 210 of the central axis L in an inclined mode, and a surface plain line 206 forms an angle a around the central axis. Preferably, the angle a ranges from 5 degrees to 15 degrees, especially 10 degrees, which is beneficial for fastening the cutter holder 2 into the base body 3 by generating enough acting force; the cutter holder 2 is an easily-damaged part, and needs to replace according to a practical condition, so that acting force generated within the angle within the range is beneficial for dismounting, and dismounting due to too great acting force is avoided. The extension handle part 202 at least includes a diameter x and a diameter y, where the diameter x is greater than the diameter y, the diameter x ranges from 50 mm to 60 mm, is preferably 55 mm; and the diameter y ranges from 35 mm to 45 mm, and is preferably 40 mm. The diameter x of the extension handle part 202 is gradually reduced to be the diameter y in a direction parallel to V3 along the central axis L. It can be realized that the diameter is gradually reduced in the V3 direction. It is apparent that the extension handle part 202 forms a conical shape, and is connected to the pressing surface 28 through a reinforcing part 201.
As further shown in FIG. 5, an included angle e, preferably 90 degrees, is formed between the pressing surface 28 and the pressure surface 29.
An included angle f, preferably 90 degrees, is formed between the pressure surface 29 and the transition surface 200. The cutter holder 2 is an easily-damaged part, and needs to replace according to a practical condition, and therefore, the pressing surface 28 and the pressure surface 29 are in a perpendicular state for facilitating mutual limiting and stopping of the two, and forming of an angle for dismounting the cutter holder 2, which is similar if the angle f is 90 degrees.
As shown in FIG. 7, the central axis L0 of the cutter mounting part 22 and the central axis L of the extension handle part 202 form an included angle c, which preferably ranges from 130 degrees to 140 degrees. According to practical application, a cutting tool is mounted in the cutter mounting part 22, so that the cutting tool forms certain angle with to-be-processed ground while performing rotary cutting in a second working direction V2, and the angle being beneficial for prolonging the service life of the cutting tool and improving flatness of cut ground. The main body 210 is provided with the pressing surface 28 which is arranged between the extension handle part 202 and the cutter mounting part 22; moreover, the pressing surface 28 and the central axis L of the extension handle part 202 form an included angle d, preferably 90 degrees; the central axis L22 is parallel to the central axis L, the angle e is 90 degrees, and the angle d is also 90 degrees.
As shown in FIG. 6 and FIG. 7, the cutter mounting part of the cutter holder is provided with the central axis L0; and the central axis L and the central axis L0 are superposed to have a virtual plane M. Moreover, the virtual plane M is a symmetrical plane of the cutter holder.
The main body 210 includes a pressure surface 29 which is at least locally arranged behind the extension handle part 202 in a direction reverse to the second working direction V2, and is in transition connection to the pressing surface 28 through a fillet 208. In addition, the main body 210 includes a transition surface 200, which is at least locally between the pressure surface 29 and the cutter mounting part 22, is arranged behind the extension handle part 202 in a direction reverse to the second working direction V2, and is in transition connection to the pressure surface 29 through a fillet 209. The pressure surface 29 is a circular-arc surface with a radius R1, and a circle center 01 of the circular-arc surface is on the symmetrical plane M of the cutter holder 2, and is superposed with the central axis L, preferably, R1 ranges from 50 mm to 60 mm.
As shown in FIG. 7, a through hole 204 is formed in the main body 210, is formed behind the extension handle part 202 in the second working direction V2, and penetrates through the main body 210. The main body 210 is provided with a counter bore 205 thereon, which is formed behind the extension handle part 202 in the second working direction V2. The through hole 204 and the counter bore 205 share a central axis L22, and the counter bore 205 is formed above the through hole 204 in a third direction V3. Moreover, the central axis L22 and the central axis L of the extension handle part 202 are arranged in parallel.
As further shown in FIG. 7, a cutter mounting surface 21, which is a stop and abut-against surface after a cutter is mounted, is arranged at an inlet of the cutter mounting part 22. Due to high-speed rotation in work of the cutter, the cutter mounting surface 21 is gradually worn to be small along with use of the cutter; a plurality of wear indicating slots 20 are formed in the outer peripheral surface of the cutter mounting part 22 for judging a use wear condition of the cutter mounting surface 21; and after the wear indicating slots 20 are worn, a novel cutter hold needs to be mounted on the base body 3 of the cutting device 1.
As shown in FIG. 8 and FIG. 9, the containing part 30 of the base body 3 is provided with a central axis L1, and a surface plain line 32 of the containing surface 30.1 forms an included angle b around L1. As a result, the containing part 30 forms a conical hollow chamber, and the diameter of the containing part is actually reduced gradually in a direction reverse to the V3 direction. Preferably, the included angle b ranges from 5 degrees to 15 degrees, and the included angle b is equal to the included angle a. The inlet 31 of the containing part is arranged between the stress surface 37 and the containing part 30, the stress surface 37 is connected to an attaching surface 36 through a fillet 39, the attaching surface 36 is connected to an auxiliary surface 38 through a fillet 39.1; a blind hole 34 is provided with a central axis L2, and passes through the auxiliary surface 38, the attaching surface 36 and the stress surface 37; the counter bore 35 and the blind hole 34 are coaxially formed, and are formed above the blind hole 34 in a direction reverse to V3. The blind hole 33 is provided with a central axis L3 which is formed in a V2 direction, preferably, L2 is perpendicular to L3. The attaching surface 36 is a circular-arc surface with a radius R2, and a circle center 02 of the circular-arc surface is on the plane M1 of the base body 3, and is superposed with the central axis L1, preferably, R2 ranges from 50 mm to 60 mm.
According to the cutting device 1 assembled and cut in the A-A direction in FIG. 10, a full view 11 of the cutter holder 2, the base body 3 and the fastening part 5 is obtained. The cutter holder 2 is fixed in the containing part 30 of the base body 3 through the extension handle part 202; moreover, if the included angle a is equal to the included angle b, the central axis L1 of the containing part 30 is superposed with the central axis L of the extension handle part 202; as mentioned above, the cylindrical fastening part 5 is provided with inner threads 50, and is used as a nut; after the locking part 4 is screwed up, the locking surface 42 thereof tightly fits to the counter bore surface 205.1 of the cutter holder 2 under action of clamping force F1 in the V3 direction; and meanwhile, the outer circular surface 51 of the fastening part 5 tightly presses the inner surface of the blind hole 33 to form a structure with a surface tangential to the inside; it can be seen that force F is generated under action of the clamping force F1 along the central axis L of the extension handle part 202; and the supporting surface 203 and the containing surface 30.1 of the containing part 30 define a tapered matching relationship. The advantage is that tapered matching defines an interference fit relationship under action of force in the F direction, and fastening between the supporting surface 203 and the containing surface 30.1 of the containing part 30 is increased along with increase of force in the V3 direction. The supporting surface 203 of the extension handle part 202 is completely meshed with the containing surface 30.1 of the containing part 30; and meanwhile, the pressing surface 28 is meshed with the pressure surface 37; the pressure surface 29 and the attaching surface 36 are tightly attached, and a relatively small gap, for example 0.5 mm, is formed between the transition surface 200 and the auxiliary surface 38. The pressing surface 28 and the stress surface 37 are difficult to attach due to existence of processing tolerance; and only the pressing surface 28 and the stress surface 37 are attached with a greater attaching area as the transition surface 200 and the auxiliary surface 38 are difficult to attach simultaneously.
As shown in FIG. 11, when the cutter holder 2 needs to dismount, the fastening part 4 is firstly rotated out anticlockwise; in practical work of the cutting device 1, fine debris and residues on a pavement will enter a gap between the outer circular surface 51 of the fastening part 5 and the inner surface of the blind hole 33 to block the fastening part 5, and therefore, a circular ring slot 53 is formed in the surface 51 at one end, exposed out of the base body 3, of the fastening part 5. In such a manner, the circular ring slot 53 can be pried with a flat hole via a flat tool, for example a straight screwdriver, so that the fastening part 5 can be easily taken out in the direction reverse to the V2 direction.
According to the cutting device 1 assembled and cut in the D-D direction in FIG. 10, a full view 12 of the cutter holder 2, the base body 3, the locking part 4 and the fastening part 5 is obtained. If R1 is equal to R2, the circle center 01 of the pressure surface 29 is superposed with the circle center 02 of the attaching surface 36, i.e., the central axis L1 of the containing part 30 is superposed with the central axis L of the extension handle part 202, and therefore, the cutter holder 2 can freely rotate by 360 degrees around the circle center 01/02. In such a manner, machining precision is favorably controlled, and the cutter holder 2 is dismounted quickly and conveniently; when the cutter holder 2 is dismounted, the pressing surface 28 and the stress surface 37 are pressed. As a result of cooling water when the cutting device 1 works, the pressure surface 29 and the attaching surface 36 are tightly bonded together due to rust corrosion generated there-between; and the discharge surfaces 26.1 and 27.1 on the side surface of the cutter holder 2 can be knocked back and forth by an iron hammer in a V direction and a V1 direction to rotate the cutter holder 2, so that rust corrosion bonding force can be easily relieved.
As can be seen from FIG. 6 and FIG. 7, three dismounting parts 23 are arranged on the cutter holder 2; the dismounting parts are separately arranged between the pressing surface 28 and the discharge surface 26.1, between the pressing surface 28 and the discharge surface 27.1 and between the pressing surface 28 and the discharge surface 25, and are sunken into the main body 210 in the V3 direction; the dismounting parts 23 are standby parts for dismounting the cutter holder 2, and can be sequentially pried by forming the lever principle in a mode of plugging prying rods, such as straight screwdrivers, into the dismounting parts 23 and utilizing the stress surface 37 of the base body 3, so that the cutter holder 2 is dismounted.
Although have been disclosed as above, the embodiments of the present invention are not limited to the applications listed in the specification and the embodiments, and can be fully applied to various fields suitable for the present invention. It is easy for those familiar with the field to implement additional modifications, so that the present invention is not limited to the specific details and embodiments shown and described herein without departing from the general concept defined by the claims and equivalent scope.
Patent Application
20240229378
