Coupling dismounting tool

Abstract

The utility model provides a coupler disassembling tool which comprises a fixing frame, a fixing mechanism used for fixing a coupler and a pushing mechanism used for pushing a main shaft in the coupler are arranged on the fixing frame, the fixing frame serves as a base of the pushing mechanism, the pushing mechanism comprises at least two stages of sleeves which are nested in a sealed mode, and a telescopic head is arranged in the innermost portion. One end of the hydraulic channel is connected with a two-way oil pump through an upper pressing pipe, and the other end of the hydraulic channel is communicated with a left oil inlet cavity of the pushing mechanism; an outer communicating hole is formed in the side wall of the end, away from the fixing frame, of the outermost sleeve and communicates with the two-way oil pump through a pressure relief pipe. And inner communicating holes are formed in the side walls of the other sleeves, so that the sleeves are communicated with the oil return cavity of the telescopic head. The device can be applied to the working condition with a small axial space, and the coupler in the small axial space can be pushed to be disassembled by stretching out and drawing back for a long distance through the small space.

Description

Technical Field

[0001] The utility model belongs to the field of couplings, and in particular relates to a coupling disassembly tool. Background Art

[0002] The coupling is a mechanical part used to connect two shafts (driving shaft and driven shaft) in different mechanisms so that they rotate together to transmit torque. In high-speed and heavy-load power transmission, some couplings also have the functions of buffering, vibration reduction and improving the dynamic performance of the shaft system. The coupling consists of two halves, which are connected to the driving shaft and the driven shaft respectively. Generally, most power machines are connected to the working machine with the help of couplings. When repairing or replacing the driven machine, the disassembly of the coupling is a big problem. Most of the time, it is disassembled on the original position, which is extremely inconvenient. If it is not disassembled properly, it will cause the coupling and even the driven shaft to be scrapped, seriously affecting the normal operation of the equipment. Patent CN205043710U provides a coupling quick disassembly tool, but this tool is not enough to meet the needs of occasions where the original position space is relatively small, especially the axial space is relatively small, but a larger pushing length is required. Summary of the invention

[0003] The utility model provides a coupling disassembly tool.

[0004] The purpose of the utility model is achieved in the following way: a coupling disassembly tool, including a fixed frame, a fixing mechanism for fixing the coupling and a pushing mechanism for pushing the main shaft in the coupling are arranged on the fixed frame, the fixed frame serves as the base of the pushing mechanism, the pushing mechanism includes at least two-stage sealed nested sleeves, and a telescopic head is arranged at the innermost part; a hydraulic channel is arranged on the fixed frame, one end of the hydraulic channel is connected to a two-way oil pump through an upper pressure pipe, and the other end is connected to the left oil inlet chamber of the pushing mechanism; an external connecting hole is arranged on the side wall of the end of the outermost sleeve away from the fixed frame, and the external connecting hole is connected to the two-way oil pump through a pressure relief pipe; the side walls of the remaining sleeves are all provided with internal connecting holes to connect the return oil chambers of each sleeve and the telescopic head.

[0005] A mounting groove is provided on one side of the fixing frame corresponding to the pushing mechanism, and the sleeve of the pushing mechanism is in the shape of a hollow cylinder. A concentric annular flange is provided outwardly on the outer circumference of one end of the hollow cylinder close to the fixing frame, and a concentric annular cover is provided inwardly on the inner circumference of the other end of the hollow cylinder. The inner diameter of the annular cover corresponds to the outer diameter of the adjacent inner sleeve slidably arranged in the annular cover, and the two are dynamically sealed. The outer diameter of the annular flange corresponds to the inner diameter of the adjacent outer sleeve and the two are dynamically sealed. The annular flange of the outermost sleeve is fixedly arranged in the mounting groove, and the end face of the outermost sleeve and the bottom surface of the mounting groove are sealed. The telescopic head includes a cylindrical rod body and an annular flange concentrically arranged on the outer cylinder of one end of the cylindrical rod body. The cylindrical flange of the telescopic head is slidably arranged in the inner cavity of the adjacent sleeve and the two are dynamically sealed. The cylindrical rod body of the telescopic head and the annular cover of the adjacent sleeve slide and are dynamically sealed.

[0006] The dynamic sealing connection is a sealing ring; the sealing ring is arranged in the sealing grooves of the outer circumferential surface of the annular flange of the sleeve, the inner circumferential surface of the annular cover and the outer circumferential surface of the annular flange of the telescopic head; a winding gasket groove is arranged on the bottom surface of the fixing frame mounting groove, a winding sealing gasket is arranged in the winding gasket groove, and the mounting groove and the end face of the outermost sleeve are sealed by a winding sealing gasket.

[0007] The outer connecting hole is a through hole, and the inner connecting holes of the other sleeves include a middle hole parallel to the length direction and the axial direction, and the middle hole is sealed at an opening at one end close to the mounting groove; the middle hole is provided with a first hole connected to the outer circumferential surface of the sleeve at a position close to the annular flange, and the middle hole is provided with a second hole connected to the inner circumferential surface of the sleeve at a position close to the annular cover.

[0008] The pushing mechanism is a double-layer sleeve structure, including an outer first sleeve fixed on a fixing frame, a second sleeve slidably arranged inside the first sleeve, and a telescopic head slidably arranged inside the second sleeve.

[0009] The fixing mechanism includes a tensioning sleeve fixed along the circumference on the side of the fixing frame close to the coupling and a tensioning block fixed along the circumference on the transmission end half of the coupling, the length direction of the tensioning block is perpendicular to the axial direction of the transmission shaft of the coupling; the end of the tensioning sleeve away from the fixing frame is detachably connected to the end of the tensioning block away from the transmission end half of the coupling, the fixing frame, the tensioning sleeve and the tensioning block are connected by a second stud running through the three; the tensioning block and the transmission end half are connected by a first stud.

[0010] A guide piece is arranged on the workbench, a guide groove is arranged on the guide piece, a guide key is fixedly arranged at the lower end of the fixing frame, the guide key is slidably arranged in the guide groove, and the length direction of the guide groove is the same as the telescopic direction of the pushing mechanism.

[0011] Compared with the prior art, the present invention adopts a two-stage or multi-stage sleeve telescopic method to disassemble the coupling, and the telescopic length of the telescopic head is doubled compared to the telescopic length of the oil cylinder. Moreover, the present invention does not adopt the existing standard oil cylinder, but uses the fixing frame of the entire tooling as the base of the pushing mechanism; thus reducing the installation space required for the pushing mechanism and reducing the volume of the entire tooling as a whole. The present invention can be applied to working conditions where the axial space is relatively small, and can push the coupling in the small axial space to be disassembled by telescoping a long distance through a small space. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the principle of the utility model.

[0013] Figure 2 yes Figure 1 Enlarged view of the middle sleeve.

[0014] Figure 3 This is a diagram showing the connection status of the guide and the fixing bracket.

[0015] Figure 4 yes Figure 3 Side view.

[0016] Among them, 1 is the first hexagonal nut, 2 is the first stud, 3 is the transmission shaft, 4. The transmission end half-connection, 5. The pressure relief pipe, 6. The two-way oil pump, 7. The second stud, 8. The second hexagonal nut, 9. The tension block, 10. The upper pressure pipe, 11. The tension sleeve, 12. The fixing frame, 13. The first sleeve, 14. The hexagon socket cylindrical head screw, 15. The spring washer, 16. The second sleeve, 17. The hexagon socket flat end set screw, 18. The telescopic head, 19. The winding sealing gasket, 20 is the driven shaft, 21 is the driven shaft half-connection, 22 is the sealing ring, 23 is the hydraulic channel, 24 is the internal connecting hole, 25 is the guide, and 26 is the guide key. DETAILED DESCRIPTION

[0017] In the present utility model, unless otherwise clearly specified and limited, the technical terms used in this application shall be the common meanings understood by the technicians of the present utility model. The terms "connected", "connected", "fixed", "set", etc. should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be directly connected, or indirectly connected through an intermediate medium; may be mechanically connected or electrically connected. Unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or indirectly contacted through an intermediate medium. Moreover, the first feature "above" or "above" or "above" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below" or "below" or "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. Relational terms such as first, second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms used in the description, such as "center", "lateral", "longitudinal", "length", "width", "thickness", "height", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "clockwise", "counterclockwise", etc., to indicate the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0018] The following will provide a clear and complete description of the technical solution of the present utility model in conjunction with the accompanying drawings and specific embodiments. Figure 1-4 As shown, a coupling disassembly tool comprises a fixed frame 12, on which a fixing mechanism for fixing the coupling and a pushing mechanism for pushing the main shaft in the coupling are arranged, the fixed frame 12 serves as the base of the pushing mechanism, the pushing mechanism comprises at least two-stage sealed nested sleeves, and a telescopic head 18 is arranged at the innermost part; a hydraulic channel 23 is arranged on the fixed frame 12, one end of the hydraulic channel 23 is connected to the two-way oil pump 6 through the upper pressure pipe 10, and the other end is connected to the left oil inlet chamber of the pushing mechanism; an outer connecting hole is arranged on the side wall of the end of the outermost sleeve away from the fixed frame 12, and the outer connecting hole is connected to the two-way oil pump 6 through the pressure relief pipe 5; the side walls of the remaining sleeves are all provided with inner connecting holes 24 to connect the oil return chambers of each sleeve and the telescopic head 18. The shape of the fixed frame 12 can be round or square. The fixed frame 12 can be slidably arranged on the workbench during operation. Figure 1In the figure, the disassembly tool is disassembling the transmission shaft 3 and the transmission end half coupling 4. On the left side of the disassembly tool are the driven shaft 20 and the driven end half coupling 21 on the workbench. The space between the transmission end half coupling 4 and the driven end half coupling 21 is the activity space of the disassembly tool. In the utility model, the coupling is disassembled by a two-stage or multi-stage sleeve telescopic method. The telescopic length of the telescopic head 18 is doubled compared with the telescopic length of the oil cylinder. Moreover, the utility model does not use the existing standard oil cylinder, but uses the fixing frame 12 of the entire tool as the base of the pushing mechanism; thus, the installation space required for the pushing mechanism is reduced, and the volume of the entire tool is reduced as a whole. In addition, the oil inlet of the oil cylinder is generally arranged on the circumferential outer surface close to one end of the oil cylinder, while the oil inlet of the utility model is located on the fixing frame 12, at the end of the hydraulic channel 23, and at the end of the entire pushing mechanism, further reducing the axial length of the entire pushing mechanism. The utility model can be applied to working conditions where the axial space is relatively small, and a longer distance can be telescoped through a smaller space to push the coupling in the smaller axial space for disassembly.

[0019] A mounting groove is provided on one side of the corresponding pushing mechanism on the fixed frame 12, and the sleeve of the pushing mechanism is in the shape of a hollow cylinder. A concentric annular flange is provided outwardly on the outer circumference of one end of the hollow cylinder close to the fixed frame 12, and a concentric annular cover is provided inwardly on the inner circumference of the other end of the hollow cylinder. The inner diameter of the annular cover corresponds to the outer diameter of the adjacent inner sleeve slidably arranged in the annular cover, and the two are dynamically sealed. The outer diameter of the annular flange corresponds to the inner diameter of the adjacent outer sleeve and the two are dynamically sealed. The annular flange of the outermost sleeve is fixedly arranged in the mounting groove, and the end face of the outermost sleeve and the bottom surface of the mounting groove are sealed. The telescopic head 18 includes a cylindrical rod body and an annular flange concentrically arranged on the outer cylinder of one end of the cylindrical rod body. The cylindrical flange of the telescopic head 18 is slidably arranged in the inner cavity of the adjacent sleeve and the two are dynamically sealed. The cylindrical rod body of the telescopic head 18 and the annular cover of the adjacent sleeve slide and are dynamically sealed. The outermost sleeve and the mounting groove can be connected by bolts. A plurality of threaded holes are arranged along the circumference on the annular flange of the outermost sleeve, and countersunk threaded holes are arranged at corresponding positions on the mounting groove. Here, hexagon socket head screws 14 and spring washers 15 can be used to realize the connection between the fixing frame 12 and the sleeve. The fixing frame 12 and the outermost sleeve are connected by bolts, and of course other connection methods can also be used. The mounting groove of the fixing frame 12 and the sleeve need to be sealed to prevent liquid from leaking out. In the structure of the utility model, one end of the hydraulic channel 23 opens on the side of the fixing frame 12, and after reaching the position of the mounting groove, it turns to set an opening on the surface of the mounting groove, and the opening is directly connected to the oil inlet chamber of the pushing mechanism. The oil inlet chamber of the utility model includes the space surrounded by the bottom surface of the mounting groove, the bottom surface of the telescopic head 18 and the bottom surface of the sleeve, and the oil return chamber includes the connected space surrounded by the circumferential surfaces of the sleeves at various levels and between the sleeves and the circumferential surfaces of the telescopic head 18. The utility model sets a mounting groove on the fixing frame 12 to fix the pushing mechanism. Compared with the structure of directly fixing the pushing mechanism on the surface of the fixing frame 12, the utility model further reduces the axial length of the entire tooling.

[0020] The dynamic sealing connection is a sealing ring 22; the sealing ring 22 is arranged in the sealing grooves of the outer circumference of the annular flange of the sleeve, the inner circumference of the annular cover, and the outer circumference of the annular flange of the telescopic head 18; a winding gasket groove is arranged on the bottom surface of the mounting groove of the fixing frame 12, and a winding sealing gasket 19 is arranged in the winding gasket groove, and the mounting groove and the end face of the outermost sleeve are sealed by the winding sealing gasket 19. There can be multiple sealing rings 22 in each dynamic sealing structure, such as two. The outer circumference of the annular flange of the outermost sleeve does not need to be provided with a sealing groove and a sealing ring 22, and is only provided on the annular cover. The sealing ring 22 belongs to the prior art and is not described in detail. The winding sealing gasket 19 here is a metal winding gasket or other winding gasket, which belongs to the prior art and is not described in detail. Other existing sealing methods can also be used.

[0021] The outer connecting hole is a through hole, and the inner connecting hole 24 of the remaining sleeves includes a middle hole parallel to the length direction and the axial direction, and the middle hole is sealed at one end opening near the mounting groove; the middle hole is provided with a first hole connected to the outer circumferential surface of the sleeve at a position close to the annular flange, and the middle hole is provided with a second hole connected to the inner circumferential surface of the sleeve at a position close to the annular cover. When the sleeve is in the expanded state, the structure of the middle hole can realize the recovery of the sleeve more quickly. A threaded hole can be provided at one end opening of the middle hole close to the mounting groove and sealed by a screw. Specifically, after the hexagonal flat-end set screw 17 is wrapped with raw tape, it is installed in the threaded hole of the sleeve.

[0022] In the structure shown in the drawings, the pushing mechanism is a double-layer sleeve structure, including an outer first sleeve 13 fixed on a fixing frame 12, a second sleeve 16 slidably disposed inside the first sleeve 13, and a telescopic head 18 slidably disposed inside the second sleeve 16. In practice, there may be multiple sleeve structures.

[0023] The fixing mechanism includes a tension sleeve 11 fixed along the circumference on the side of the fixing frame 12 close to the coupling and a tension block 9 fixed along the circumference on the transmission end half coupling 4, the length direction of the tension block 9 is perpendicular to the axial direction of the transmission shaft 3; the end of the tension sleeve 11 away from the fixing frame 12 is detachably connected to the end of the tension block 9 away from the transmission end half coupling 4, and the fixing frame 12, the tension sleeve 11, and the tension block 9 are connected by a second stud 7 running through the three; the tension block 9 and the transmission end half coupling 4 are connected by a first stud 2. The two ends of the first stud 2 are fixed by a first hexagonal nut 1. The two ends of the second stud 7 are fixed by a second hexagonal nut 8. The coupling here is the transmission end half coupling 4, in which the transmission shaft 3 is arranged.

[0024] Furthermore, a guide member 25 is provided on the workbench where the coupling needs to be disassembled, and a guide groove is provided on the guide member 25. A guide key 26 is fixedly provided at the lower end of the fixed frame 12, and the guide key 26 is slidably provided in the guide groove, and the length direction of the guide groove is the same as the telescopic direction of the pushing mechanism. Here, the guide member 25 can play a role in supporting the fixed frame during the installation of the tooling and the operation of the tooling. When the fixed frame 12 moves, the guide key 26 slides in the guide groove to play a supporting and guiding role. The guide key 26 can be fixed to the bottom of the fixed frame by welding or the like.

[0025] The assembly method of the utility model is as follows: Now install the corresponding sealing ring 22 on the telescopic head 18, the second sleeve 16, and the first sleeve 13 respectively. After winding the raw tape with the hexagon socket flat-end set screw 17, install it in the threaded hole at one end of the middle hole of the second sleeve 16. Install the telescopic head 18 into the second sleeve 16, and install the second sleeve 16 into the first sleeve 13. Install the winding seal 19 into the winding groove of the fixing frame 12, and then install the first sleeve 13 on the fixing frame 12, and fasten the first sleeve 13 to the fixing frame 12 with the hexagon socket cylindrical head screw 14 and the spring washer 15. Insert the first stud 2 into the bolt hole of the transmission end half-connection 4, and use the first hexagonal nut 1 to press one end of the tension block 9 and the transmission end half-connection 4; insert the second stud 7 into the bolt hole of the tension block 9, and press it with the second hexagonal nut 8, insert the tension sleeve 11 onto the second stud 7, and then insert the second stud 7 into the bolt hole of the fixing frame 12, and press it with the second hexagonal nut 8. Install one end of the upper pressure pipe 10 on the two-way oil pump 6, and the other end on the fixing frame 12. Install one end of the pressure relief pipe 5 on the two-way oil pump 6, and the other end on the first sleeve 13.

[0026] During specific implementation: the fixture fixing frame 12 can be placed directly on the workbench, or a guide piece can be placed on the workbench, and the fixing frame 12 can be placed in the guide groove of the guide piece. The position of the movable fixture ensures that the telescopic head 18 is aligned with the transmission shaft 3, and the tension block 9 is aligned with the transmission end half-coupler 4. The tension block 9 and the transmission end half-coupler 4 are fixed by the second stud. When starting work, the two-way oil pump 6 rotates forward, and the pressure oil reaches the oil inlet chamber through the upper pressure pipe 10 and the hydraulic channel 23 in the fixing frame 12, pushing the second sleeve 16 and the telescopic head 18 to extend forward, and the telescopic head 18 supports the transmission shaft 3. The tension block 9 is used to drive the transmission end half-coupler 4 to gradually be removed from the transmission shaft 3. During this process, the transmission shaft 3 does not move, and the transmission end half-coupler 4 moves with the disassembly fixture. At the same time, the oil in the chamber composed of the first sleeve 13, the second sleeve 16 and the telescopic head 18 is squeezed back to the two-way oil pump 6 through the arrow B. When it is necessary to separate the driven shaft 20 and the driven end half coupling 21, the fixing frame is connected to the driven end half coupling 21, and the rest of the process is the same.

[0027] After disassembly, the hydraulic oil is pumped into the oil return chamber through the pressure relief pipe 5 of the two-way oil pump 6 via arrow D, and the telescopic head 18 and the second sleeve 16 are recovered. At this time, the oil in the chamber composed of the fixed frame 12, the first sleeve 13, the second sleeve 16, and the telescopic head 18 is squeezed back to the two-way oil pump 6 via arrow C, and the telescopic head 18 exits from the middle hole of the transmission end half-connection 4. The utility model has a simple structure, realizes the hydraulic telescopic function through the two-way oil pump 6; the tooling has strong operability, flexible matching, wide application occasions, long service life, is economical and practical, and is easy to operate.

[0028] The technical features of the above-mentioned embodiments can be combined arbitrarily, and as long as there is no contradiction in the combination of these technical features, they should be considered as the scope of this specification. Without departing from the overall concept of the utility model, the technical solution of the utility model and the equivalent replacement or change, as well as the changes and improvements made, should also be regarded as the protection scope of the utility model.

Claims

1. A coupling disassembly tool, comprising a fixing frame, on which a fixing mechanism for fixing the coupling and a pushing mechanism for pushing a main shaft in the coupling are arranged, characterized in that: The fixing frame serves as the base of the pushing mechanism, and the pushing mechanism includes at least two levels of sealed nested sleeves, with a telescopic head arranged at the innermost part; a hydraulic channel is arranged on the fixing frame, one end of the hydraulic channel is connected to the two-way oil pump through an upper pressure pipe, and the other end is connected to the left oil inlet chamber of the pushing mechanism; an external connecting hole is arranged on the side wall of the end of the outermost sleeve away from the fixing frame, and the external connecting hole is connected to the two-way oil pump through a pressure relief pipe; the side walls of the remaining sleeves are all provided with internal connecting holes to connect the oil return chambers of each sleeve and the telescopic head.

2. A coupling disassembly tool according to claim 1, characterized in that: A mounting groove is provided on one side of the fixing frame corresponding to the pushing mechanism, and the sleeve of the pushing mechanism is in the shape of a hollow cylinder. A concentric annular flange is provided outwardly on the outer circumference of one end of the hollow cylinder close to the fixing frame, and a concentric annular cover is provided inwardly on the inner circumference of the other end of the hollow cylinder. The inner diameter of the annular cover corresponds to the outer diameter of the adjacent inner sleeve slidably arranged in the annular cover, and the two are dynamically sealed. The outer diameter of the annular flange corresponds to the inner diameter of the adjacent outer sleeve and the two are dynamically sealed. The annular flange of the outermost sleeve is fixedly arranged in the mounting groove, and the end face of the outermost sleeve and the bottom surface of the mounting groove are sealed. The telescopic head includes a cylindrical rod body and an annular flange concentrically arranged on the outer cylinder of one end of the cylindrical rod body. The cylindrical flange of the telescopic head is slidably arranged in the inner cavity of the adjacent sleeve and the two are dynamically sealed. The cylindrical rod body of the telescopic head and the annular cover of the adjacent sleeve slide and are dynamically sealed.

3. A coupling disassembly tool according to claim 2, characterized in that: The dynamic sealing connection is a sealing ring; the sealing ring is arranged in the sealing grooves of the outer circumferential surface of the annular flange of the sleeve, the inner circumferential surface of the annular cover and the outer circumferential surface of the annular flange of the telescopic head; a winding gasket groove is arranged on the bottom surface of the fixing frame mounting groove, a winding sealing gasket is arranged in the winding gasket groove, and the mounting groove and the end face of the outermost sleeve are sealed by a winding sealing gasket.

4. A coupling disassembly tool according to claim 2, characterized in that: The outer connecting hole is a through hole, and the inner connecting holes of the other sleeves include a middle hole parallel to the length direction and the axial direction, and the middle hole is sealed at an opening at one end close to the mounting groove; the middle hole is provided with a first hole connected to the outer circumferential surface of the sleeve at a position close to the annular flange, and the middle hole is provided with a second hole connected to the inner circumferential surface of the sleeve at a position close to the annular cover.

5. The coupling disassembly tool according to claim 2, characterized in that: The pushing mechanism is a double-layer sleeve structure, including an outer first sleeve fixed on a fixing frame, a second sleeve slidably arranged inside the first sleeve, and a telescopic head slidably arranged inside the second sleeve.

6. A coupling disassembly tool according to any one of claims 1 to 5, characterized in that: The fixing mechanism includes a tensioning sleeve fixed along the circumference on the side of the fixing frame close to the coupling and a tensioning block fixed along the circumference on the transmission end half-coupling, the length direction of the tensioning block is perpendicular to the axial direction of the transmission shaft in the transmission end half-coupling; the end of the tensioning sleeve away from the fixing frame is detachably connected to the end of the tensioning block away from the transmission end half-coupling, the fixing frame, the tensioning sleeve and the tensioning block are connected by a second stud running through the three; the tensioning block and the transmission end half-coupling are connected by a first stud.

7. A coupling disassembly tool according to any one of claims 1 to 5, characterized in that: A guide piece is arranged on the workbench, a guide groove is arranged on the guide piece, a guide key is fixedly arranged at the lower end of the fixing frame, the guide key is slidably arranged in the guide groove, and the length direction of the guide groove is the same as the telescopic direction of the pushing mechanism.

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