End face driving center

Abstract

The utility model discloses an end face driving center which is characterized by comprising a supporting handle and a driving body, the supporting handle comprises a supporting rod and a supporting portion, a cavity is formed in the driving body, the supporting portion is arranged in the cavity in the mode that the supporting portion can move left and right in the axial direction, and the left end of the supporting rod extends leftwards to be arranged outside the driving body. The center of the right end of the driving body is provided with a fixed center, the fixed center and the supporting handle are coaxial, four transmission pins are movably arranged on the driving body in a left-right telescopic mode, the left ends of the transmission pins extend into the cavity, the right ends of the transmission pins extend out of the driving body, and balance mechanisms are arranged between the transmission pins and the supporting part. The clamping device has the advantages that the structure is simple, the balance block capable of swinging up and down is matched with the hemispherical abutting part of the corresponding transmission pin, the clamping device has high sensitivity and can adapt to various conditions of the surface of a workpiece, dynamic balance is compensated through up-down swinging of the balance block, and stable clamping force is provided.

Description

TECHNICAL FIELD

[0001] The utility model relates to lathe processing fixture technical field especially is involved in a kind of end face driving tailstock. BACKGROUND

[0002] End drive is a kind of clamping device used when machining whole shaft parts, drives shaft parts to rotate by the way of cooperation between end face driving tailstock and tailstock, is connected with lathe spindle usually by morse taper and flange, is the most effective clamping mode in turning and grinding.In the process of machining, workpiece is positioned by fixed tailstock, the blade of transmission pin is cut into the end face of workpiece, and the tailstock is clamped simultaneously, the torque of lathe spindle is effectively transmitted to the end face of workpiece when lathe works.In the process of turning, chuck is no longer relied on, in the process of positioning, chuck is no longer positioned whole circle, tailstock is positioned a point, and end face driving tailstock is positioned a point, tailstock is positioned a point, and the influence of coaxiality caused by the difference of machining datum is reduced in the machining of shaft workpiece, for long shaft workpiece, machining of whole shaft part can be completed by once clamping, compared with traditional movable tailstock, machining precision is not affected by bounce, and it can be well adapted to the machining of end face with certain inclination.

[0003] The floating amount of the common end face driving tailstock is small, and the surface of workpiece is strictly limited when using, when large diameter feed is needed in actual cutting, the clamping force provided by transmission pin is much smaller than cutting force, which will lead to normal machining, in addition, the balance mechanism used by traditional structure of end face driving tailstock is generally spherical hinge structure, and the flexibility is poor, and it is easy to be stuck, so that the stress of transmission pin becomes unstable, and it cannot provide clamping force normally, so that the applicable scene of this traditional structure of end face driving tailstock is less, and the applicable condition is more strict. SUMMARY

[0004] The utility model provides a kind of end face driving tailstock to solve the technical problems that the utility model wants to solve, which has simple structure, good flexibility, can be better self-adaptive adjustment to the end face condition of workpiece to adapt to different machining conditions, and can provide stable clamping force.

[0005] The technical scheme adopted by the utility model to solve the above technical problems is as follows:

[0006] The utility model provides an end face drive centre, including support handle and drive main body, support handle includes support rod and support part which are coaxial along the axial direction from left to right, drive main body is provided with the cavity which is matched with support part, support part is movably arranged in the cavity along the axial direction, the left end of support rod is arranged outside drive main body, the right end of drive main body is provided with fixed centre, and fixed centre is coaxial with support handle, four transmission pins are movably arranged on drive main body, four transmission pins are evenly arranged around the outside of fixed centre, the left end of transmission pin is arranged in the cavity, and the right end of transmission pin is arranged outside drive main body, and balance mechanism is arranged between transmission pin and support part.

[0007] The balance mechanism includes two balance blocks, the balance blocks are spaced apart and are swingably arranged in the support part, the right side surface of the balance block opposite to the left end of the transmission pin is an abutting surface, the abutting surface is a flat surface, the left end of the transmission pin is provided with a hemispherical abutting portion, one balance block corresponds to two transmission pins, and the two abutting portions are abutted on the corresponding abutting surfaces.

[0008] The support part is recessed to the left and provided with a limiting recess cavity penetrating through the front and back, the balance block is swingably arranged in the limiting recess cavity, and the abutting surface is arranged outside the limiting recess cavity. The space of the support part is reasonably utilized, and the volume of the overall structure can be reduced.

[0009] The two balance blocks are connected by a mounting bracket, the mounting bracket includes a mounting block, the mounting block is fixedly installed in the limiting recess cavity, the front end surface and the rear end surface of the mounting block are respectively provided with rotating installation columns, the rotating installation columns are coaxial, the balance block is provided with rotating installation holes matched with the rotating installation columns, and the balance block is rotatably installed on the matched rotating installation columns through the rotating installation holes. The connecting and installing structure for realizing the up-down swing of the balance block is simple and stable.

[0010] The limiting cavity comprises a left limiting chamber and a right limiting chamber arranged in sequence from left to right, the mounting block is a rectangular block, the left limiting chamber is matched with the mounting block, the left end of the mounting block is embeddedly mounted in the left limiting chamber, the balance block is swingably arranged in the right limiting chamber, and swing gaps are respectively arranged between the upper end face of the balance block and the upper end face of the right limiting chamber and between the lower end face of the balance block and the lower end face of the right limiting chamber. The left limiting chamber limits the stable mounting of the mounting block, and the right limiting chamber limits the up-and-down swing stroke of the balance block, thereby avoiding the influence of excessive floating on normal use.

[0011] The upper end face of the balance block is provided with an upper inclined end face which is inclined upward from left to right, the lower end face of the balance block is provided with a lower inclined end face which is inclined downward from left to right, the upper inclined end face and the lower inclined end face are arranged in mirror symmetry, the upper end face of the right limiting chamber is provided with a matched upper inclined limiting face which is inclined upward from left to right at a position matched with the upper inclined end face, the lower end face of the right limiting chamber is provided with a matched lower inclined limiting face which is inclined downward from left to right at a position matched with the lower inclined end face, and the swing gaps are arranged between the upper inclined end face and the upper inclined limiting face and between the lower inclined end face and the lower inclined limiting face. The swing gaps formed by the matched inclined end faces can realize the flexible swing of the balance block.

[0012] The right side of the upper inclined end face is connected with an upper flat end face, the right side of the lower inclined end face is connected with a lower flat end face, the part of the right limiting chamber corresponding to the upper flat end face and the lower flat end face is a matched flat limiting end face, and the swing gaps are arranged between the upper flat end face, the lower flat end face and the corresponding flat limiting end face. The above design realizes the controllable swing stroke.

[0013] The mounting bracket is fixedly connected with the support portion through a pin shaft from top to bottom. The structure is simple, and the mounting and dismounting are convenient.

[0014] The driving body comprises a shell and an end cover, the shell has the cavity with the right side opening, the end cover is detachably mounted at the right end of the shell to close the right side opening of the cavity, the fixed center is arranged at the right end center of the end cover, the transmission pin is swingably arranged on the end cover, the left end of the transmission pin penetrates the end cover and is arranged in the cavity, the right end of the transmission pin with the blade part is arranged outside the end cover, and the support rod is arranged outside the shell to the left. The above driving body has a simple structure, the shell and the end cover are detachably connected, and the assembly of other components is facilitated.

[0015] The end cap is provided with corresponding guide holes that pass through the left and right sides for the transmission pin to extend and retract left and right. The right end of the transmission pin with a blade extends out through the corresponding guide hole and is arranged on the outside of the end cap. The side of the end cap is provided with a locking screw hole connected to the corresponding guide hole at the position corresponding to each guide hole. The central axis of the locking screw hole is perpendicular to the central axis of the corresponding connected guide hole. A locking screw is threadedly provided in each locking screw hole. The position of the transmission pin corresponding to the locking screw is recessed with an anti-rotation guide groove. The inner end of the locking screw abuts against the anti-rotation guide groove of the corresponding transmission pin. One guide hole allows the right end of the transmission pin to extend outward, and the other guides the movement of the transmission pin. The combination of the locking screw and the guide groove is used to lock the blade angle of the transmission pin.

[0016] A guide recess is provided on the side of the fixed tip at a position corresponding to the drive pin, and the outwardly extending portion of the drive pin is embedded in the corresponding guide recess. The guide recess further guides the drive pin, and the fixed tip also provides support for the drive pin.

[0017] The side of the driving body is provided with an anti-rotation screw hole connected to the cavity. An anti-rotation screw is threaded into the anti-rotation screw hole. The support portion is provided with a left and right anti-rotation positioning groove at a position corresponding to the anti-rotation screw. The inner end of the anti-rotation screw is provided with a guide portion, which is embedded in the anti-rotation positioning groove. The anti-rotation screw and the anti-rotation positioning groove cooperate to prevent the support portion from rotating within the cavity, forcing it to move left and right in a set direction, ensuring that one balance block can support two drive pins.

[0018] Compared with the existing technology, the advantages of the present invention are: simple structure, a balancing block that can swing up and down cooperates with the hemispherical abutment part of the corresponding transmission pin, has high sensitivity, can adapt to various conditions of the workpiece surface, and compensates for dynamic balance through the up and down swinging of the balancing block to provide a stable clamping force, so that the end face drive center can be adapted to various different processing conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0020] Figure 2 This is a schematic cross-sectional view of the utility model with the pin removed;

[0021] Figure 3The utility model discloses a three-dimensional structure schematic diagram of shell removal;

[0022] Figure 4 The utility model discloses a sectional structure schematic diagram;

[0023] Figure 5 For Figure 3 The utility model discloses a sectional structure schematic diagram of shell removal;

[0024] Figure 6 The utility model discloses a sectional structure schematic diagram of shell removal;

[0025] Figure 7 The utility model discloses a sectional structure schematic diagram of shell removal;

[0026] Figure 8 The utility model discloses a sectional structure schematic diagram of shell removal;

[0027] Figure 9 The utility model discloses a sectional structure schematic diagram of shell removal. Specific implementation

[0028] The utility model discloses a sectional structure schematic diagram of shell removal.

[0029] As shown in the figure, a face drive center, including support handle 2 and drive main body 1, support handle 2 includes support rod 201 and support portion 202 that are coaxially arranged along the axial direction from left to right, drive main body 1 is provided with cavity 101 matched with support portion 202, support portion 202 is movably arranged in cavity 101 along the axial direction, the left end of support rod 201 is arranged outside drive main body 1, the right end of drive main body 1 is provided with fixed center 3 in the form of right protrusion, fixed center 3 is coaxial with support handle 2, four transmission pins 4 are movably arranged on drive main body 1, four transmission pins 4 are evenly arranged around the outside of fixed center 3, the left end of transmission pin 4 is arranged in cavity 101, the right end of transmission pin 4 is arranged outside drive main body 1, and balance mechanism is arranged between transmission pin 4 and support portion 202.

[0030] Balance mechanism includes two balance blocks 5, and the two balance blocks 5 are movably arranged in support portion 202 with front and back interval, and the right side surface opposite to the left end of transmission pin 4 on balance block 5 is abutting surface 51, abutting surface 51 is flat end surface, the left end of transmission pin 4 is provided with semispherical abutting portion 41, one balance block 5 is matched with two transmission pins 4, so that the two abutting portions 41 matched are abutted on the corresponding abutting surface 51.

[0031] In this specific embodiment, the support part 202 is concave to the left and provided with a front and rear through limiting recess 21, the balance block 5 is swingably arranged in the limiting recess 21, and the abutting surface 51 is arranged outside the limiting recess 21. The space of the support part 202 is reasonably utilized, and the volume of the overall structure can be reduced.

[0032] In this specific embodiment, the two balance blocks 5 are connected through a mounting bracket, the mounting bracket includes a mounting block 6, the mounting block 6 is fixedly arranged in the limiting recess 21, the front end surface and the rear end surface of the mounting block 6 are respectively provided with a rotating mounting column 61, the two rotating mounting columns 61 are coaxial, the balance block 5 is provided with a rotating mounting hole (not marked in the figure) matched with the rotating mounting column 61, and the balance block 5 is rotatably arranged on the matched rotating mounting column 61 through the rotating mounting hole. The connecting and mounting structure for realizing the up and down swing of the balance block 5 is simple and stable in connection and mounting.

[0033] In this specific embodiment, the end of the rotating mounting column 61 protrudes from the corresponding balance block 5 and is provided with a clamping spring K. The balance block 5 can be stably mounted on the mounting bracket, and the disengagement is prevented.

[0034] In this specific embodiment, the limiting recess 21 includes a left limiting chamber 211 and a right limiting chamber 212 arranged in sequence from left to right, the mounting block 6 is a rectangular block, the left limiting chamber 211 is matched with the mounting block 6, the left end of the mounting block 6 is embeddedly arranged in the left limiting chamber 211, the balance block 5 is swingably arranged in the right limiting chamber 212, and swing gaps 7 are respectively arranged between the upper end surface of the balance block 5 and the upper end surface of the right limiting chamber 212 and between the lower end surface of the balance block 5 and the lower end surface of the right limiting chamber 212. The mounting block 6 can be stably fixedly mounted through the left limiting chamber 211, and the up and down swing stroke of the balance block 5 is limited through the right limiting chamber 212, so that the floating is prevented from being too large to affect the normal use.

[0035] In this specific embodiment, the upper end surface of the balance block 5 has an upper inclined end surface 53 inclined upward from left to right, the lower end surface of the balance block 5 has a lower inclined end surface 54 inclined downward from left to right, the upper inclined end surface 53 and the lower inclined end surface 54 are mirror-symmetrically arranged, the upper end surface of the right limiting chamber 212 is provided with a matched upper inclined limiting surface 213 inclined upward from left to right at a position matched with the upper inclined end surface 53, the lower end surface of the right limiting chamber 212 is provided with a matched lower inclined limiting surface 214 inclined downward from left to right at a position matched with the lower inclined end surface 54, and swing gaps 7 are arranged between the upper inclined end surface 53 and the upper inclined limiting surface 213 and between the lower inclined end surface 54 and the lower inclined limiting surface 214. The swing gaps 7 matched between the inclined end surfaces can realize the flexible swing of the balance block 5.

[0036] In this embodiment, the right side of the upper inclined end surface 53 is connected with an upper flat end surface 531, the right side of the lower inclined end surface 54 is connected with a lower flat end surface 541, the portions of the right limiting chamber 212 corresponding to the upper flat end surface 531 and the lower flat end surface 541 are flat limiting end surfaces 215, and the upper flat end surface 531, the lower flat end surface 541 and the corresponding flat limiting end surfaces 215 are provided with an oscillation gap 7. The above design realizes controllable oscillation stroke.

[0037] In this embodiment, the mounting bracket is fixedly connected with the support part 202 by a pin shaft 8 from top to bottom. The structure is simple, and the mounting and dismounting are convenient.

[0038] In this embodiment, the driving main body 1 includes a shell 102 and an end cover 103. The shell 102 has a right-side-opened cavity 101, and the end cover 103 is detachably mounted at the right end of the shell 102 to close the right-side opening of the cavity 101. The fixed center 3 is arranged at the right end center of the end cover 103. The transmission pin 4 is arranged on the end cover 103 and can be telescopically moved leftward and rightward. The left end of the transmission pin 4 extends into the cavity 101 through the end cover 103, the right end of the transmission pin 4 with a blade portion extends out of the end cover 103, and the support rod 201 extends out of the shell 102 leftward. The above driving main body 1 has a simple structure, and the shell 102 and the end cover 103 are detachably connected, which facilitates the assembly of other components.

[0039] In this embodiment, the fixed center 3 is detachably mounted on the end cover 103. The above design realizes replaceable fixed center 3 and saves production cost.

[0040] In this embodiment, the end cover 103 is provided with left-right through guide holes 11 corresponding to the left-right telescopical movement of the transmission pin 4. The right end of the transmission pin 4 with a blade portion extends out of the end cover 103 through the corresponding guide hole 11. The side of the end cover 103 is provided with locking screw holes 12 corresponding to the positions of the guide holes 11. The center axis of the locking screw hole 12 is perpendicular to the center axis of the corresponding guide hole 11. A locking screw 9 is screwed in each locking screw hole 12. The transmission pin 4 is provided with an anti-rotation guide groove (not shown in the figure) corresponding to the mounting position of the locking screw. The inner end of the locking screw 9 abuts against the anti-rotation guide groove of the corresponding transmission pin 4. One of the guide holes 11 is used for the outward extension of the right end of the transmission pin 4, and the other guide hole 11 is used for guiding the movement of the transmission pin 4. The locking screw 9 is used for locking the blade angle of the transmission pin 4.

[0041] In this embodiment, the side of the fixed center 3 is provided with a guide recess 31 corresponding to the position of the transmission pin 4, and the outwardly extending part of the transmission pin 4 is embedded in the corresponding guide recess 31. The guide recess 31 further guides the transmission pin 4, and the fixed center 3 also provides support for the transmission pin 4.

[0042] In this embodiment, the side of the driving body 1 is provided with an anti-rotation screw hole 14 communicating with the cavity 101, and an anti-rotation screw 10 is screwed into the anti-rotation screw hole 14. The support part 202 is provided with a left-right through anti-rotation positioning groove 20 corresponding to the position of the anti-rotation screw 10. The inner end of the anti-rotation screw 10 is provided with a guide part 100, which is embedded in the anti-rotation positioning groove 20. Through the cooperation of the anti-rotation screw 10 and the anti-rotation positioning groove 20, the support part 202 is prevented from rotating in the cavity 101, so that it can only move left and right in a set direction, ensuring that one balance block 5 can support two transmission pins 4.

[0043] Compared with the traditional method of using a chuck and a tail center to process long shaft parts, the product can process long shaft parts in their entire length, eliminating the need for repositioning and secondary clamping, which affects the machining precision. The balance block 5 mechanism inside the end drive has high sensitivity and can adapt to the end surface conditions of the part, achieving dynamic balance while ensuring that the four transmission pins 4 are uniformly stressed, and is suitable for different processing conditions and provides stable clamping force.

[0044] In specific operation, the fixed center 3 of the product is used to position the center of the end surface of the workpiece, and the tail center is positioned at the other end of the workpiece. The support handle 2 moves left and right along the axial direction, pushing the blade of the transmission pin 4 to turn into the end surface of the workpiece. Under the action of the balancing mechanism, the two ends of the balance block 5 can provide the same support force, so that the clamping force of each transmission pin 4 acting on the end surface of the workpiece is uniform and stable, and the torque of the lathe spindle can be stably transmitted to the workpiece. When the end surface of the workpiece is inclined, one or one side of the transmission pin 4 can be inward, and the other transmission pin 4 can be outward, and the balance block 5 can be balanced in the inclined state through the support of the support handle 2. Therefore, during the machining process, the balance block 5 can always achieve dynamic balance, and the end drive can always be stable and have sufficient clamping force when clamping the workpiece.

Claims

1. An end face drive centre, characterised in that The utility model provides a driving device, including support handle and drive main part, support handle includes support rod and support part from left to right coaxial arrangement along the axial direction, drive main part is provided with the cavity that cooperates with support part, support part is left and right movable arrangement in the cavity along the axial direction, the left end of support rod is left and projects and is arranged outside drive main part, the right end of drive main part is right and is provided with fixed center in the protruding, fixed center is coaxial with support handle, drive main part is provided with four transmission pins and is left and right telescopic movable, four transmission pins are evenly distributed and are arranged outside fixed center, the left end of transmission pin is in and is arranged in the cavity, the right end of transmission pin is out and is arranged outside drive main body, and transmission pin is provided with balance mechanism between support part, The utility model discloses a driving device, including support handle and drive main part, support handle includes support rod and support part from left to right coaxial arrangement along the axial direction, drive main part is provided with the cavity that cooperates with support part, support part is left and right movable arrangement in the cavity along the axial direction, the left end of support rod is left and projects and is arranged outside drive main part, the right end of drive main part is right and is provided with fixed center in the protruding, fixed center is coaxial with support handle, drive main part is provided with four transmission pins and is left and right telescopic movable, four transmission pins are evenly distributed and are arranged outside fixed center, the left end of transmission pin is in and is arranged in the cavity, the right end of transmission pin is out and is arranged outside drive main body, and transmission pin is provided with balance mechanism between support part, 2. An end face drive centre according to claim 1 wherein The utility model discloses a driving device, including support handle and drive main part, support handle includes support rod and support part from left to right coaxial arrangement along the axial direction, drive main part is provided with the cavity that cooperates with support part, support part is left and right movable arrangement in the cavity along the axial direction, the left end of support rod is left and projects and is arranged outside drive main part, the right end of drive main part is right and is provided with fixed center in the protruding, fixed center is coaxial with support handle, drive main part is provided with four transmission pins and is left and right telescopic movable, four transmission pins are evenly distributed and are arranged outside fixed center, the left end of transmission pin is in and is arranged in the cavity, the right end of transmission pin is out and is arranged outside drive main body, and transmission pin is provided with balance mechanism between support part, 3. An end face drive centre according to claim 2, wherein The utility model discloses a driving device, including support handle and drive main part, support handle includes support rod and support part from left to right coaxial arrangement along the axial direction, drive main part is provided with the cavity that cooperates with support part, support part is left and right movable arrangement in the cavity along the axial direction, the left end of support rod is left and projects and is arranged outside drive main part, the right end of drive main part is right and is provided with fixed center in the protruding, fixed center is coaxial with support handle, drive main part is provided with four transmission pins and is left and right telescopic movable, four transmission pins are evenly distributed and are arranged outside fixed center, the left end of transmission pin is in and is arranged in the cavity, the right end of transmission pin is out and is arranged outside drive main body, and transmission pin is provided with balance mechanism between support part, 4. An end face drive centre according to claim 3, wherein The utility model discloses a driving device, including support handle and drive main part, support handle includes support rod and support part from left to right coaxial arrangement along the axial direction, drive main part is provided with the cavity that cooperates with support part, support part is left and right movable arrangement in the cavity along the axial direction, the left end of support rod is left and projects and is arranged outside drive main part, the right end of drive main part is right and is provided with fixed center in the protruding, fixed center is coaxial with support handle, drive main part is provided with four transmission pins and is left and right telescopic movable, four transmission pins are evenly distributed and are arranged outside fixed center, the left end of transmission pin is in and is arranged in the cavity, the right end of transmission pin is out and is arranged outside drive main body, and transmission pin is provided with balance mechanism between support part, The utility model discloses a driving device, including support handle and drive main part, support handle includes support rod and support part from left to right coaxial arrangement along the axial direction, drive main part is provided with the cavity that cooperates with support part, support part is left and right movable arrangement in the cavity along the axial direction, the left end of support rod is left and projects and is arranged outside drive main part, the right end of drive main part is right and is provided with fixed center in the protruding, fixed center is coaxial with support handle, drive main part is provided with four transmission pins and is left and right telescopic movable, four transmission pins are evenly distributed and are arranged outside fixed center, the left end of transmission pin is in and is arranged in the cavity, the right end of transmission pin is out and is arranged outside drive main body, and transmission pin is provided with balance mechanism between support part, The utility model discloses a driving device, including support handle and drive main part, support handle includes support rod and support part from left to right coaxial arrangement along the axial direction, drive main part is provided with the cavity that cooperates with support part, support part is left and right movable arrangement in the cavity along the axial direction, the left end of support rod is left and projects and is arranged outside drive main part, the right end of drive main part is right and is provided with fixed center in the protruding, fixed center is coaxial with support handle, drive main part is provided with four transmission pins and is left and right telescopic movable, four transmission pins are evenly distributed and are arranged outside fixed center, the left end of transmission pin is in and is arranged in the cavity, the right end of transmission pin is out and is arranged outside drive main body, and transmission pin is provided with balance mechanism between support part, The utility model discloses a driving device, including support handle and drive main part, support handle includes support rod and support part from left to right coaxial arrangement along the axial direction, drive main part is provided with the cavity that cooperates with support part, support part is left and right movable arrangement in the cavity along the axial direction, the left end of support rod is left and projects and is arranged outside drive main part, the right end of drive main part is right and is provided with fixed center in the protruding, fixed center is coaxial with support handle, drive main part is provided with four transmission pins and is left and right telescopic movable, four transmission pins are evenly distributed and are arranged outside fixed center, the left end of transmission pin is in and is arranged in the cavity, the right end of transmission pin is out and is arranged outside drive main body, and transmission pin is provided with balance mechanism between support part, The utility model discloses a driving device, including support handle and drive main part, support handle includes support rod and support part from left to right coaxial arrangement along the axial direction, drive main part is provided with the cavity that cooperates with support part, support part is left and right movable arrangement in the cavity along the axial direction, the left end of support rod is left and projects and is arranged outside drive main part, the right end of drive main part is right and is provided with fixed center in the protruding, fixed center is coaxial with support handle, drive main part is provided with four transmission pins and is left and right telescopic movable, four transmission pins are evenly distributed and are arranged outside fixed center, the left end of transmission pin is in and is arranged in the cavity, the right end of transmission pin is out and is arranged outside drive main body, and transmission pin is provided with balance mechanism between support part, The utility model discloses a driving device, including support handle and drive main part, support handle includes support rod and support part from left to right coaxial arrangement along the axial direction, drive main part is provided with the cavity that cooperates with support part, support part is left and right movable arrangement in the cavity along the axial direction, the left end of support rod is left and projects and is arranged outside drive main part, the right end of drive main part is right and is provided with fixed center in the protruding, fixed center is coaxial with support handle, drive main part is provided with four transmission pins and is left and right telescopic movable, four transmission pins are evenly distributed and are arranged outside fixed center, the left end of transmission pin is in and is arranged in the cavity, the right end of transmission pin is out and is arranged outside drive main body, and transmission pin is provided with balance mechanism between support part, The utility model discloses a driving device, including support handle and drive main part, support handle includes support rod and support part from left to right coaxial arrangement along the axial direction, drive main part is provided with the cavity that cooperates with support part, support part is left and right movable arrangement in the cavity along the axial direction, the left end of support rod is left and projects and is arranged outside drive main part, the right end of drive main part is right and is provided with fixed center in the protruding, fixed center is coaxial with support handle, drive main part is provided with four transmission pins and is left and right telescopic movable, four transmission pins are evenly distributed and are arranged outside fixed center, the left end of transmission pin is in and is arranged in the 5. An end drive centre according to claim 4, wherein The upper end surface of the balance block has an upper inclined end surface inclined upward from left to right, the lower end surface of the balance block has a lower inclined end surface inclined downward from left to right, the upper inclined end surface is arranged in mirror symmetry with the lower inclined end surface, the upper inclined end surface is arranged on the upper end surface of the right limiting chamber, and the upper inclined end surface is matched with the upper inclined end surface.

6. An end drive centre according to claim 5 wherein The right side of the upper inclined end surface is connected with an upper flat end surface, the right side of the lower inclined end surface is connected with a lower flat end surface, corresponding parts of the upper flat end surface and the lower flat end surface in the right limiting chamber are flat limiting end surfaces matched with each other, and the upper flat end surface, the lower flat end surface and the corresponding flat limiting end surfaces are provided with the swing gap.

7. An end drive center according to claim 3 wherein The mounting bracket is fixedly connected with the support part through a pin shaft from top to bottom.

8. An end drive center according to claim 1 wherein The driving body comprises a shell and an end cover, the shell has the cavity with the right opening, the end cover is detachably mounted at the right end of the shell to close the right opening of the cavity, the fixed center is arranged at the right end center of the end cover, the transmission pin is arranged on the end cover and can be left-right telescopic, the left end of the transmission pin is arranged in the cavity through the end cover, the right end of the transmission pin with the blade part is arranged outside the end cover, and the support rod is arranged outside the shell to the left.

9. An end drive centre according to claim 8, wherein The end cover is provided with left-right through guide holes corresponding to the left-right telescopic movement of the transmission pin, the right end of the transmission pin with the blade part is arranged outside the end cover through the corresponding guide hole, the side of the end cover is provided with locking screw holes corresponding to each guide hole and communicating with the corresponding guide hole, the center axis of the locking screw hole is perpendicular to the center axis of the corresponding guide hole, a locking screw is screw-connected in each locking screw hole, and the transmission pin is recessed with an anti-rotation guide groove corresponding to the position of the locking screw.

10. An end drive center according to claim 1 wherein The side of the driving body is provided with an anti-rotation screw hole communicating with the cavity, the anti-rotation screw hole is screw-connected with an anti-rotation screw, the support part is provided with a left-right through anti-rotation positioning groove corresponding to the position of the anti-rotation screw, the inner end of the anti-rotation screw is provided with a guide part, and the guide part is embedded in the anti-rotation positioning groove.

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