Auxiliary device for machining motor driver

Abstract

The invention relates to the field of welding, in particular to an auxiliary device for machining a motor driver, which comprises a main rack, two brackets are symmetrically and fixedly mounted at the edge of one side of the upper end of the main rack, a shifting shaft is rotatably mounted between the ends of the two brackets, and a plurality of shifting rings are coaxially embedded in the outer surface of the shifting shaft in a linear array manner; a plurality of carrying sleeves are attached to the outer surface of the shifting shaft in a linear array mode, the carrying sleeves and the shifting rings are arranged in a staggered mode, the carrying sleeves are attached to the shifting rings, torsional springs are arranged between the interiors of the carrying sleeves and the shifting rings, clamping groove strips extend from the outer surfaces of the carrying sleeves, and the clamping groove strips are distributed in an annular array mode; the distance between the clamping groove strips is the same as the distance between the cooling fins, and a gear is coaxially embedded in the front end of the shifting shaft. According to the invention, subsequent welding is facilitated, normal positioning of a plurality of cooling fins is ensured, and use is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of welding, and more specifically to an auxiliary device for the processing of motor drivers. Background Art

[0002] A motor driver, also known as a motor controller, is an electronic device that converts electrical energy into mechanical energy and is a key device for controlling and managing the operation of an electric motor. It precisely controls the speed, torque, and direction of the motor by receiving external control signals. Among them, the heat sink is one of the key components on the motor driver, and its function is to allow the motor driver to dissipate heat quickly, avoiding the phenomenon of the motor driver running stuck due to overheating.

[0003] When welding the heat sink to the housing of the motor driver, auxiliary facilities are often used to accurately position the heat sink for welding. However, in the actual welding process, when multiple heat sinks are positioned on the housing of the motor driver and welded from the back to the front, due to the small spacing between multiple heat sinks, it is easy to be blocked by the front heat sink during the welding process, resulting in inconvenient welding. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies in the background art and propose an auxiliary device for the processing of motor drivers.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An auxiliary device for the processing of motor drivers, including a main platform frame. At one side edge of the upper end of the main platform frame, two brackets are symmetrically and fixedly installed. A dial shaft is rotatably installed between the ends of the two brackets. A plurality of dial rings are coaxially inlaid on the outer surface of the dial shaft in a linear array. A plurality of carrier sleeves are fitted on the outer surface of the dial shaft in a linear array. The plurality of carrier sleeves and the plurality of dial rings are arranged in a staggered manner, and the carrier sleeves are in close contact with the dial rings. A torsion spring is provided between the inside of the carrier sleeve and the dial ring. The outer surfaces of the plurality of carrier sleeves all extend with card slot strips. The plurality of card slot strips are arranged in a circular array. The spacing between the plurality of card slot strips is the same as the spacing between the heat sinks. A gear is coaxially inlaid at the front end of the dial shaft. A toothed plate is engaged with the lower part of the gear. The toothed plate is connected to the front bracket. A threaded rod is connected to the lower end of the toothed plate. A threaded sleeve is screwed on the outer surface of the threaded rod. The threaded sleeve is fixed to the front bracket. A positioning member is arranged on the upper end of the main platform frame near the side of the bracket.

[0006] Preferably, the other end of the threaded rod is coaxially rotatably installed with a connection cap. The upper end of the connection cap is fixed to the toothed plate. The rear end of the toothed plate extends with a T-shaped sliding frame. The T-shaped sliding frame is slidably connected to the front bracket.

[0007] Preferably, a resistance ring is coaxially inlaid on the outer surface of the shifting shaft. The resistance ring is in close contact with the front end of the carrier sleeve at the front edge. One end of the threaded rod is coaxially and fixedly installed with a second handwheel.

[0008] Preferably, top ears extend from the outer surfaces of the plurality of shifting rings. The plurality of top ears are arranged in an annular array. The ends of the plurality of top ears are respectively and fittingly installed with lug ears. The ends of the plurality of lug ears are respectively fixed to the plurality of carrier sleeves.

[0009] Preferably, the positioning member includes a secondary platform frame fixedly installed on the upper end of the main platform frame near the side of the bracket. Two positioning bars symmetrically extend from the upper end of the secondary platform frame. The positioning bars are inclined. Two positioning blocks symmetrically extend from the front of the upper end surface of the secondary platform frame near the two positioning bars. Two corner brackets are symmetrically arranged at the lower end of the secondary platform frame. An insertion block extends from the end of the corner bracket. A positioning plate is fixedly installed near the insertion block at the front end of the corner bracket.

[0010] Preferably, a square sleeve is slidably installed on the outer surface of the corner bracket. The upper end of the square sleeve is fixed to the secondary platform frame. A fixed sleeve is arranged in front of the upper end of the main platform frame near the secondary platform frame. A bearing shaft is fittingly installed inside the fixed sleeve. Both ends of the bearing shaft penetrate through the front and rear ends of the fixed sleeve. Two push ears symmetrically extend from the rear end of the bearing shaft. Connecting frames are rotatably installed at the ends of the two push ears. The ends of the two connecting frames are respectively rotatably connected to the two corner brackets.

[0011] Preferably, two sleeve frames symmetrically extend from the lower end of the fixed sleeve. The ends of the sleeve frames are fixed to the main platform frame. Restriction rings are fittingly installed at the front and rear ends of the fixed sleeve. The restriction rings are inlaid on the outer surface of the bearing shaft. A fixed column is elastically installed at the upper end of the fixed sleeve. The fixed column passes through the fixed sleeve and is inserted into the outer surface of the bearing shaft.

[0012] Preferably, a fixed shell is slidably installed on the outer surface of the fixed column. The fixed shell is fixed to the fixed sleeve. A pressure cap coaxially extends from the outer surface of the fixed column. The pressure cap is slidably installed on the inner surface of the fixed shell. A compression spring is wound around the outer side of the fixed column. One end of the compression spring is fixed to the upper end of the pressure cap. The other end of the compression spring is fixed to the upper end inside the fixed shell. A fixing hole is formed on the outer surface of the bearing shaft. The fixed column is inserted into the fixing hole. A first handwheel is coaxially and fixedly installed at the front end of the bearing shaft.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. Under the action of the threaded rod and the threaded sleeve, the toothed plate can be driven to move, thereby driving the gear to rotate, enabling the collar on the shifting shaft to rotate synchronously, and driving the carrier sleeve to rotate through the torsion spring, so that the multiple card slot strips arranged in an annular array on the carrier sleeve can be flipped, and multiple radiators can be pressed onto the driver housing from back to front in sequence for positioning, to avoid being obstructed by the front radiator during the welding process, thus facilitating subsequent welding. At the same time, after the rear radiator is pressed onto the driver housing for positioning, when the shifting shaft continues to rotate to drive the front radiator to be pressed onto the driver housing for positioning, the torsion spring will deform, enabling the rear radiator to maintain the positioning state while the front radiator can still be driven to be pressed onto the driver housing for positioning, thereby ensuring the normal positioning of multiple radiators.

[0014] 2. After placing the driver housing on the auxiliary bench, the positioning strips will fit on both sides of the auxiliary bench, and the positioning blocks will fit on the front end faces of both sides of the driver housing to position the driver housing. Subsequently, the bearing shaft is rotated slightly to drive the connecting frame to move through the pushing lugs, and then drive the corner bracket to slide in the square sleeve to insert the insertion block into the installation slot on the driver housing. At the same time, the positioning plate fits on the front end face of the driver housing. At this time, the fixing column is automatically pushed out under the action of the compression spring and inserted into the fixing hole to fix the insertion block inserted into the installation slot, thereby firmly fixing the driver housing. The process is simple to operate and effectively facilitates use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the overall structural schematic diagram of the present invention; Figure 2 is the schematic diagram of the fixed shell of the present invention; Figure 3 is the internal view of the fixed shell of the present invention; Figure 4 is the schematic diagram of the threaded rod of the present invention; Figure 5 is the schematic diagram of the carrier sleeve of the present invention; Figure 6 is the internal view of the carrier sleeve of the present invention; Figure 7 is the schematic diagram of the driver housing of the present invention; Figure 8 is the usage view of the present invention; Figure 9 of the present invention Figure 8 is the schematic diagram of the insertion block.

[0016] In the accompanying drawings, the list of components represented by each reference numeral is as follows: 1. Main bench; 2. Sub-bench; 3. Positioning bar; 4. Fixed shell; 5. Sleeve; 6. Threaded rod; 7. Bracket; 8. Shifting shaft; 9. Carrier sleeve; 10. Groove bar; 11. Blocking ring; 12. Shifting ring; 13. T-shaped sliding frame; 14. Threaded sleeve; 15. Connecting cap; 16. Tooth plate; 17. Gear; 18. Torsion spring; 19. Lug; 20. Top ear; 21. Square sleeve; 22. Angle bracket; 23. Insert block; 24. Positioning plate; 25. Positioning block; 26. Bearing shaft; 27. Pushing ear; 28. Fixed sleeve; 29. Connecting frame; 30. Fixed column; 31. Compression spring; 32. Compression cap; 33. Limiting ring; 34. Fixed hole; 35. First handwheel; 36. Second handwheel; 37. Driver housing; 38. Heat sink. Detailed implementation manners

[0017] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0018] The present invention provides a technical solution: As Figures 1 - 9An auxiliary device for motor driver processing shown in the figure comprises a main frame 1, two brackets 7 are symmetrically fixedly installed at the edge of one side of the upper end of the main frame 1, a shifting shaft 8 is rotatably installed between the ends of the two brackets 7, the bracket 7 plays a role in supporting and connecting the shifting shaft 8, a plurality of shifting rings 12 are coaxially inlaid in a linear array on the outer surface of the shifting shaft 8, the shifting shaft 8 plays a role in driving the shifting ring 12 to rotate, a plurality of carrier sleeves 9 are fittedly installed in a linear array on the outer surface of the shifting shaft 8, and the shifting ring 12 plays a role in shifting the carrier sleeve 9. The plurality of carrier sleeves 9 and the plurality of dial rings 12 are staggered, and the carrier sleeves 9 are tightly attached to the dial rings 12 to prevent the carrier sleeves 9 from shifting forward and backward. A torsion spring 18 is arranged between the interior of the carrier sleeve 9 and the dial ring 12. After the heat sink 38 at the rear is pressed against the driver housing 37 for positioning, the dial shaft 8 continues to rotate to drive the heat sink 38 at the front to be pressed against the driver housing 37 for positioning. The torsion spring 18 will be deformed, so that the heat sink 38 at the rear can be driven and pressed against the driver housing 37 while the heat sink 38 at the front can be kept in the positioning state. The plurality of slots 10 are arranged in a circular array, and the plurality of heat sinks 38 can be pressed onto the driver housing 37 from the back to the front for positioning, so as to avoid being blocked by the heat sink 38 in the front during welding. The spacing between the plurality of slots 10 is the same as the spacing between the heat sinks 38, which can ensure that the plurality of heat sinks 38 after positioning meet the product standards. A gear 17 is coaxially inlaid on the front end, and a toothed plate 16 is meshed at the lower part of the gear 17. The cooperation between the toothed plate 16 and the gear 17 drives the dial shaft 8 to rotate. The toothed plate 16 is connected to the front bracket 7. The lower end of the toothed plate 16 is connected to a threaded rod 6. A threaded sleeve 14 is screwed on the outer surface of the threaded rod 6. The cooperation between the threaded rod 6 and the threaded sleeve 14 drives the toothed plate 16 to move. The threaded sleeve 14 is fixed to the front bracket 7. A positioning piece is provided on the side of the upper end of the main stand 1 near the bracket 7.

[0019] The other end of the threaded rod 6 is coaxially rotatably installed with a connecting cap 15, the upper end of the connecting cap 15 is fixed to the tooth plate 16, and the connecting cap 15 can ensure that the rotation of the threaded rod 6 will not be hindered. A T-shaped slide 13 extends from the rear end of the tooth plate 16, and the T-shaped slide 13 is slidably connected to the front bracket 7, and the T-shaped slide 13 serves to guide the tooth plate 16.

[0020] A block ring 11 is coaxially inlaid on the outer surface of the shift shaft 8. The block ring 11 is tightly attached to the front end of the carrier sleeve 9 at the front edge. The block ring 11 can block the carrier sleeve 9 at the front edge to prevent the carrier sleeve 9 at the front edge from shifting forward and backward. A number two handwheel 36 is coaxially fixedly installed at one end of the threaded rod 6. The number two handwheel 36 serves to facilitate the rotation of the threaded rod 6.

[0021] The outer surfaces of multiple dial rings 12 are all extended with top ears 20. The multiple top ears 20 are arranged in an annular array. The ends of the multiple top ears 20 are all fitted with lug ears 19. The ends of the multiple lug ears 19 are respectively fixed to the multiple carrier sleeves 9. When the welding is completed and the dial shaft 8 rotates reversely, the dial rings 12 will also rotate reversely. At this time, the top ears 20 on the dial rings 12 will push the lug ears 19, so that the carrier sleeve 9 has sufficient reverse force to remove the slot strip 10 from the heat sink 38 welded on the driver housing 37.

[0022] The positioning member includes a secondary platform 2 fixedly installed on the upper end of the main platform 1 near the side of the bracket 7. The secondary platform 2 serves to support the driver housing 37. Two positioning strips 3 symmetrically extend from the upper end of the secondary platform 2. The positioning strips 3 can be fitted to both sides of the driver housing 37 for positioning. The positioning strips 3 are inclined, which can adapt to the two inclined surfaces of the driver housing 37, so that the two sides of the positioning strips 3 and the driver housing 37 can be in full contact. Two positioning blocks 25 symmetrically extend from the front of the upper end surface of the secondary platform 2 near the two positioning strips 3. The positioning blocks 25 will be fitted to the front end surfaces of both sides of the driver housing 37 to position the driver housing 37. Two corner brackets 22 are symmetrically arranged at the lower end of the secondary platform 2. An insertion block 23 extends from the end of the corner bracket 22. The corner bracket 22 serves to carry the insertion block 23 and the positioning plate 24. A positioning plate 24 is fixedly installed near the insertion block 23 at the front end of the corner bracket 22. The insertion block 23 can be inserted into the installation slot on the driver housing 37. At the same time, the positioning plate 24 will be fitted to the front end surface of the driver housing 37 to fix the driver housing 37.

[0023] A square sleeve 21 is slidably installed on the outer surface of the corner bracket 22. The upper end of the square sleeve 21 is fixed to the secondary platform 2. The square sleeve 21 serves to guide the corner bracket 22. A fixed sleeve 28 is arranged in front of the upper end of the main platform 1 near the secondary platform 2. A bearing shaft 26 is fitted inside the fixed sleeve 28. The fixed sleeve 28 serves to carry the bearing shaft 26. Both ends of the bearing shaft 26 penetrate through the front and rear ends of the fixed sleeve 28. Two push ears 27 symmetrically extend from the rear end of the bearing shaft 26. Connecting frames 29 are rotatably installed at the ends of the two push ears 27. The ends of the two connecting frames 29 are respectively rotatably connected to the two corner brackets 22. The bearing shaft 26 can drive the push ears 27 to rotate, and then drive the connecting frames 29 to move to push the corner brackets 22, so that the two insertion blocks 23 can move synchronously towards each other.

[0024] At the lower end of the fixed sleeve 28, two sleeve brackets 5 symmetrically extend. The end of the sleeve bracket 5 is fixed to the main table bracket 1. The sleeve bracket 5 plays a role in supporting and fixing the fixed sleeve 28. Limit rings 33 are fitted and installed on the front and rear ends of the fixed sleeve 28. The limit rings 33 are embedded on the outer surface of the bearing shaft 26. The limit rings 33 can prevent the bearing shaft 26 from sliding back and forth. At the upper end of the fixed sleeve 28, a fixed column 30 is elastically installed. The fixed column 30 passes through the fixed sleeve 28 and is inserted into the outer surface of the bearing shaft 26. The fixed column 30 can fix the bearing shaft 26, and further fix the insertion block 23 inserted into the installation groove on the driver housing 37.

[0025] A fixed shell 4 is slidably installed on the outer surface of the fixed column 30. The fixed shell 4 is fixed to the fixed sleeve 28. The fixed shell 4 plays a role in carrying the fixed column 30. A compression cap 32 coaxially extends on the outer surface of the fixed column 30. The compression cap 32 is slidably installed on the inner surface of the fixed shell 4. A compression spring 31 is wound around the outside of the fixed column 30. The compression cap 32 is pushed by the compression spring 31. One end of the compression spring 31 is fixed to the upper end of the compression cap 32, and the other end of the compression spring 31 is fixed to the upper inner part of the fixed shell 4. The compression spring 31 can push the fixed column 30 so that the fixed column 30 can be self-inserted into the fixing hole 34. A fixing hole 34 is provided on the outer surface of the bearing shaft 26. The fixed column 30 is inserted into the inside of the fixing hole 34. The fixing hole 34 plays a role in cooperating with the fixed column 30. A first handwheel 35 is coaxially and fixedly installed at the front end of the bearing shaft 26. The first handwheel 35 plays a role in facilitating the rotation of the bearing shaft 26.

[0026] In use, first insert multiple heat sinks 38 into multiple slot bars 10 of the annular array in sequence, and fix the heat sinks 38 in the slot bars 10 through friction. Subsequently, place the driver housing 37 on the secondary bench 2. At this time, the positioning bars 3 will be attached to both sides of the secondary bench 2, and the positioning blocks 25 will be attached to the front end faces of both sides of the driver housing 37 to position the driver housing 37. Subsequently, rotate the bearing shaft 26 slightly to drive the connecting frame 29 to move through the push lugs 27, and then drive the angle frame 22 to slide within the square sleeve 21 to insert the insertion block 23 into the installation slot on the driver housing 37. At the same time, the positioning plate 24 is attached to the front end face of the driver housing 37. At this time, the fixing column 30 is automatically pushed out under the action of the compression spring 31 and inserted into the fixing hole 34 to fix the insertion block 23 inserted into the installation slot, thereby fixing the driver housing 37 on the secondary bench 2. Subsequently, the threaded rod 6 can be rotated to drive the rack 16 to move by means of the thread between it and the threaded sleeve 14, and then drive the gear 17 to rotate, so that the dial ring 12 on the dial shaft 8 can rotate synchronously, and drive the carrier sleeve 9 to rotate through the torsion spring 18, so that the multiple slot bars 10 arranged in an annular array on the carrier sleeve 9 can be flipped. After the last heat sink 38 is pressed and positioned on the driver housing 37, stop rotating the threaded rod 6. At this time, the heat sink 38 can be welded to the driver housing 37 through welding equipment. Then continue to rotate the threaded rod 6 to press and position the heat sink 38 in front of this heat sink 38 on the driver housing 37. Subsequently, stop rotating the threaded rod 6 again to weld the heat sink 38 to the driver housing 37, and so on, to weld multiple heat sinks 38 to the driver housing 37 and avoid being blocked by the heat sink 38 in front during the welding process.

[0027] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0028] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary device for machining a motor driver, comprising a main frame (1), characterized in that: Two brackets (7) are symmetrically fixedly installed at the edge of one side of the upper end of the main stand (1), and a shifting shaft (8) is rotatably installed between the ends of the two brackets (7). The outer surface of the shifting shaft (8) is coaxially inlaid with a plurality of shifting rings (12) in a linear array, and the outer surface of the shifting shaft (8) is fitted with a plurality of carrier sleeves (9) in a linear array. The plurality of carrier sleeves (9) and the plurality of shifting rings (12) are staggered, and the carrier sleeves (9) and the shifting rings (12) are tightly attached. A torsion spring (18) is arranged between the inside of the carrier sleeve (9) and the shifting ring (12), and the outer surfaces of the plurality of carrier sleeves (9) are extended with a card slot strip (10 ), a plurality of the slot bars (10) are arranged in a circular array, the spacing between the plurality of slot bars (10) is the same as the spacing between the heat sinks, a gear (17) is coaxially inlaid on the front end of the shift shaft (8), a toothed plate (16) is meshed at the lower part of the gear (17), the toothed plate (16) is connected to the front bracket (7), the lower end of the toothed plate (16) is connected to a threaded rod (6), the outer surface of the threaded rod (6) is screwed with a threaded sleeve (14), the threaded sleeve (14) is fixed to the front bracket (7), and a positioning piece is provided at the upper end of the main stand (1) near the side of the bracket (7).

2. The auxiliary device for motor driver processing according to claim 1, characterized in that: A connecting cap (15) is coaxially rotatably mounted on the other end of the threaded rod (6); the upper end of the connecting cap (15) is fixed to a toothed plate (16); a T-shaped slide (13) extends from the rear end of the toothed plate (16); and the T-shaped slide (13) is slidably connected to the front bracket (7).

3. The auxiliary device for motor driver processing according to claim 1, characterized in that: The outer surface of the shifting shaft (8) is coaxially inlaid with a block ring (11), and the block ring (11) is closely attached to the front end of the carrier sleeve (9) at the front edge. A second hand wheel (36) is coaxially fixedly mounted on one end of the threaded rod (6).

4. The auxiliary device for motor driver processing according to claim 1, characterized in that: The outer surfaces of the plurality of shift rings (12) are all extended with top ears (20), the plurality of top ears (20) are arranged in a ring array, the ends of the plurality of top ears (20) are all fitted with lugs (19), and the ends of the plurality of lugs (19) are respectively fixed to the plurality of carrier sleeves (9).

5. The auxiliary device for motor driver processing according to claim 1, characterized in that: The positioning member comprises a sub-frame (2) fixedly mounted on the upper end of the main frame (1) near the side of the bracket (7); two positioning bars (3) symmetrically extend from the upper end of the sub-frame (2); the positioning bars (3) are arranged in an inclined manner; two positioning blocks (25) symmetrically extend from the upper end surface of the sub-frame (2) near the front of the two positioning bars (3); two corner frames (22) are symmetrically arranged at the lower end of the sub-frame (2); an insert block (23) extends from the end of the corner frame (22); and a positioning plate (24) is fixedly mounted at the front end of the corner frame (22) near the insert block (23).

6. The auxiliary device for motor driver processing according to claim 5, characterized in that: A square sleeve (21) is slidably mounted on the outer surface of the angle frame (22), the upper end of the square sleeve (21) is fixed to the auxiliary frame (2), a fixing sleeve (28) is arranged at the upper end of the main frame (1) near the front of the auxiliary frame (2), a bearing shaft (26) is fitted inside the fixing sleeve (28), both ends of the bearing shaft (26) pass through the front and rear ends of the fixing sleeve (28), two push ears (27) are symmetrically extended from the rear end of the bearing shaft (26), the ends of the two push ears (27) are rotatably mounted with connecting frames (29), and the ends of the two connecting frames (29) are rotatably connected to the two angle frames (22) respectively.

7. The auxiliary device for motor driver processing according to claim 6, characterized in that: Two sleeve frames (5) are symmetrically extended from the lower end of the fixing sleeve (28), and the ends of the sleeve frames (5) are fixed to the main frame (1). The front and rear ends of the fixing sleeve (28) are fitted with limiting rings (33), and the limiting rings (33) are embedded in the outer surface of the bearing shaft (26). The upper end of the fixing sleeve (28) is elastically mounted with a fixing column (30), and the fixing column (30) passes through the fixing sleeve (28) and is inserted into the outer surface of the bearing shaft (26).

8. The auxiliary device for motor driver processing according to claim 7, characterized in that: A fixing shell (4) is slidably mounted on the outer surface of the fixing column (30), and the fixing shell (4) is fixed on the fixing sleeve (28). A pressure cap (32) is coaxially extended from the outer surface of the fixing column (30), and the pressure cap (32) is slidably mounted on the inner surface of the fixing shell (4). A compression spring (31) is wound around the outer side of the fixing column (30), and one end of the compression spring (31) is fixed to the upper end of the pressure cap (32), and the other end of the compression spring (31) is fixed to the inner upper end of the fixing shell (4). A fixing hole (34) is formed on the outer surface of the bearing shaft (26), and the fixing column (30) is inserted into the inside of the fixing hole (34). A number one hand wheel (35) is coaxially fixedly mounted on the front end of the bearing shaft (26).

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