An auxiliary device for motor driver processing

Abstract

The present invention relates to the field of welding, and specifically to an auxiliary device for processing motor drivers, comprising a main frame, two brackets symmetrically fixedly installed at one edge of the upper end of the main frame, a shift shaft rotatably installed between the ends of the two brackets, a plurality of shift rings coaxially inlaid in a linear array on the outer surface of the shift shaft, a plurality of carrier sleeves fitted in a linear array on the outer surface of the shift shaft, the plurality of carrier sleeves and the plurality of shift rings are staggered and tightly attached to the carrier sleeves, a torsion spring is provided between the interior of the carrier sleeve and the shift rings, a plurality of slot bars extend from the outer surface of the plurality of carrier sleeves, the plurality of slot bars are arranged in a circular array, the spacing between the plurality of slot bars is the same as the spacing between heat sinks, and a gear is coaxially inlaid at the front end of the shift shaft. The present invention facilitates subsequent welding, ensures the normal positioning of the plurality of heat sinks, and is convenient for use.

Description

Technical Field

[0001] The invention relates to the field of welding, and in particular to an auxiliary device for machining a motor driver. 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 electric motors. It receives external control signals to precisely control the motor's speed, torque, and direction. The heat sink is a key component of a motor driver, rapidly dissipating heat and preventing overheating and operational lag.

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

[0004] The purpose of the present invention is to solve the shortcomings of the background technology and to propose an auxiliary device for motor driver processing.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an auxiliary device for motor driver processing, comprising a main frame, two brackets symmetrically fixedly installed at one side edge of the upper end of the main frame, a shift shaft rotatably installed between the ends of the two brackets, the outer surface of the shift shaft is coaxially inlaid with a plurality of shift rings in a linear array, the outer surface of the shift shaft is fitted with a plurality of carrier sleeves in a linear array, the plurality of carrier sleeves are staggered with the plurality of shift rings, and the carrier sleeves are tightly fitted with the shift rings, a torsion spring is arranged between the interior of the carrier sleeve and the shift ring, the outer surfaces of the plurality of carrier sleeves are extended with slots, the plurality of slots are arranged in a circular array, the spacing between the plurality of slots is the same as the spacing between the heat sinks, the front end of the shift shaft is coaxially inlaid with a gear, the lower part of the gear is meshed with a tooth plate, the tooth plate is connected to the front bracket, the lower end of the tooth plate is connected to a threaded rod, the outer surface of the threaded rod is screwed with a threaded sleeve, the threaded sleeve is fixed to the front bracket, and a positioning piece is provided on the side of the upper end of the main frame near the bracket.

[0006] Preferably, a connecting cap is coaxially mounted on the other end of the threaded rod, the upper end of the connecting cap is fixed to the tooth plate, a T-shaped slide extends from the rear end of the tooth plate, and the T-shaped slide is slidably connected to the front bracket.

[0007] Preferably, a block ring is coaxially inlaid on the outer surface of the shift shaft, and the block ring is tightly attached to the front end of the carrier sleeve at the front edge. A number two handwheel is coaxially fixedly mounted on one end of the threaded rod.

[0008] Preferably, the outer surfaces of the plurality of shift rings are extended with top ears, the plurality of top ears are arranged in a circular array, the ends of the plurality of top ears are fitted with lugs, and the ends of the plurality of lugs are respectively fixed to a plurality of carrier sleeves.

[0009] Preferably, the positioning member includes a sub-frame fixedly mounted on the upper end of the main frame near the side of the bracket, two positioning bars symmetrically extending from the upper end of the sub-frame, the positioning bars are inclined, and two positioning blocks symmetrically extend from the upper end face of the sub-frame near the front of the two positioning bars, and two corner brackets are symmetrically arranged at the lower end of the sub-frame, plug blocks extend from the ends of the corner brackets, and a positioning plate is fixedly mounted on the front end of the corner bracket near the plug blocks.

[0010] Preferably, a square sleeve is slidably installed on the outer surface of the angle bracket, and the upper end of the square sleeve is fixed to the auxiliary frame. A fixed sleeve is provided on the upper end of the main frame near the front of the auxiliary frame, and a load-bearing shaft is fitted inside the fixed sleeve. Both ends of the load-bearing shaft pass through the front and rear ends of the fixed sleeve, and two push ears are symmetrically extended from the rear end of the load-bearing shaft. The ends of the two push ears are rotatably installed with connecting frames, and the ends of the two connecting frames are rotatably connected to the two angle brackets respectively.

[0011] Preferably, two sleeve frames are symmetrically extended from the lower end of the fixed sleeve, and the ends of the sleeve frames are fixed to the main frame. The front and rear ends of the fixed sleeve are fitted with limiting rings, and the limiting rings are embedded in the outer surface of the load-bearing shaft. The upper end of the fixed sleeve is elastically mounted with a fixing column, and the fixing column passes through the fixed sleeve and is inserted into the outer surface of the load-bearing shaft.

[0012] Preferably, a fixed shell is slidably installed on the outer surface of the fixed column, and the fixed shell is fixed on the fixed sleeve. A pressure cap is coaxially extended on the outer surface of the fixed column, and 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, and the other end of the compression spring is fixed to the inner upper end of the fixed shell. A fixing hole is opened on the outer surface of the load-bearing shaft, and the fixing column is inserted into the inside of the fixing hole. The front end of the load-bearing shaft is coaxially fixed with a No. 1 handwheel.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. Under the action of the threaded rod and the threaded sleeve, the toothed plate can be driven to move, and then the gear can be driven to rotate, so that the dial ring on the dial shaft can rotate synchronously, and the carrier sleeve is driven to rotate through the torsion spring, so that the multiple card slots arranged in a circular array on the carrier sleeve can be flipped, so as to press the multiple heat sinks on the driver housing from back to front for positioning, so as to avoid being obstructed by the front heat sink during the welding process, thereby facilitating subsequent welding. At the same time, after the rear heat sink is pressed on the driver housing for positioning, the dial shaft continues to rotate to drive the front heat sink to be pressed on the driver housing for positioning. The torsion spring will be deformed, so that the rear heat sink remains in a positioned state while the front heat sink can still be driven and pressed on the driver housing for positioning, thereby ensuring the normal positioning of the multiple heat sinks.

[0015] 2. After placing the driver housing on the sub-stand, the positioning strips will fit on both sides of the sub-stand, and the positioning blocks will fit on both sides of the front end surfaces of the driver housing to position the driver housing. Then, the load-bearing shaft will be rotated slightly to drive the connecting frame to move through the push ears, and then drive the angle frame to slide in the square sleeve to insert the plug into the mounting groove on the driver housing. At the same time, the positioning plate fits the front end surface of the driver housing. At this time, the fixing column is pushed out by itself under the action of the compression spring and inserted into the fixing hole to fix the plug inserted in the mounting groove. In this way, the driver housing can be firmly fixed. The process is simple to operate and effectively facilitates use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the fixed shell of the present invention;

[0018] Figure 3 An internal view of the fixed housing of the present invention;

[0019] Figure 4 This is a schematic diagram of the threaded rod of the present invention;

[0020] Figure 5 This is a schematic diagram of the carrier sleeve of the present invention;

[0021] Figure 6 An internal view of the carrier sleeve of the present invention;

[0022] Figure 7 is a schematic diagram of a driver housing of the present invention;

[0023] Figure 8 It is a view of the use of the present invention;

[0024] Figure 9 For the present invention Figure 8 Schematic diagram of the middle plug-in block.

[0025] In the accompanying drawings, the list of parts represented by each reference number is as follows: 1. Main frame; 2. Sub-frame; 3. Positioning bar; 4. Fixed shell; 5. Sleeve; 6. Threaded rod; 7. Bracket; 8. Dial shaft; 9. Carrying sleeve; 10. Slot bar; 11. Block ring; 12. Dial ring; 13. T-shaped slide; 14. Threaded sleeve; 15. Connecting cap; 16. Tooth plate; 17. Gear; 18. Torsion spring; 19. Lug; 20. Top lug; 21. Square sleeve; 22. Angle bracket; 23. Insert block; 24. Positioning plate; 25. Positioning block; 26. Load-bearing shaft; 27. Push ear; 28. Fixed sleeve; 29. ​​Connecting frame; 30. Fixed column; 31. Compression spring; 32. Pressure cap; 33. Limiting ring; 34. Fixing hole; 35. Handwheel No. 1; 36. Handwheel No. 2; 37. Drive housing; 38. Heat sink. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] The present invention provides a technical solution: Figures 1-9An auxiliary device for motor driver processing shown in the figure includes a main frame 1, two brackets 7 are symmetrically fixedly installed on the edge of one side of the upper end of the main frame 1, a dial shaft 8 is rotatably installed between the ends of the two brackets 7, the bracket 7 plays a role in supporting and connecting the dial shaft 8, a plurality of dial rings 12 are coaxially inlaid in a linear array on the outer surface of the dial shaft 8, and the dial shaft 8 plays a role in driving the dial ring 12 to rotate, a plurality of carrier sleeves 9 are fitted on the outer surface of the dial shaft 8 in a linear array, and the dial ring 12 plays a role in toggling 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 provided between the interior of the carrier sleeve 9 and the dial ring 12. After the rear heat sink 38 is pressed against the driver housing 37 for positioning, the dial shaft 8 continues to rotate to drive the front heat sink 38 to press against the driver housing 37 for positioning. The torsion spring 18 will deform, so that the rear heat sink 38 can still be driven and pressed against the driver housing 37 while maintaining the positioning state. The outer surfaces of the multiple carrier sleeves 9 are extended with card slots 10, which play the role of clamping and fixing the heat sink 38. The multiple card slots 10 are arranged in a ring array, and the multiple heat sinks 38 can be pressed on the driver housing 37 from back to front for positioning to avoid being blocked by the front heat sink 38 during welding. The spacing between the multiple card slots 10 is the same as the spacing between the heat sinks 38, which can ensure that the multiple heat sinks 38 after positioning meet the product standards. The front end is coaxially inlaid with a gear 17, and the lower part of the gear 17 is meshed with a toothed plate 16. 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 the threaded rod 6. The outer surface of the threaded rod 6 is tightened with a threaded sleeve 14. 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.

[0028] 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.

[0029] The outer surface of the shift shaft 8 is coaxially inlaid with a block ring 11, which is close 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.

[0030] The outer surfaces of the multiple shift rings 12 are all extended with top ears 20, and the multiple top ears 20 are arranged in a ring array. The ends of the multiple top ears 20 are all fitted with lugs 19, and the ends of the multiple lugs 19 are respectively fixed to the multiple carrier sleeves 9. When the welding is completed, when the shift shaft 8 rotates in the opposite direction, the shift ring 12 will also rotate in the opposite direction. At this time, the top ears 20 on the shift ring 12 will push the lugs 19, so that the carrier sleeve 9 has sufficient reverse force to remove the slot strip 10 from the heat sink 38 welded to the driver housing 37.

[0031] The positioning member includes a sub-frame 2 fixedly mounted on the upper end of the main frame 1 near the side of the bracket 7. The sub-frame 2 serves to support the driver housing 37. Two positioning bars 3 are symmetrically extended from the upper end of the sub-frame 2. The positioning bars 3 serve to fit the two sides of the driver housing 37 for positioning. The positioning bars 3 are inclined and can adapt to the inclined surfaces on both sides of the driver housing 37 so that the positioning bars 3 and the two sides of the driver housing 37 can fully contact each other. Two positioning blocks 25 are symmetrically extended from the upper end surface of the sub-frame 2 near the front of the two positioning bars 3. The positioning block 25 will fit into the front end surfaces of both sides of the driver housing 37 to position the driver housing 37. Two angle brackets 22 are symmetrically provided at the lower end of the sub-stand 2. Insert blocks 23 are extended from the ends of the angle brackets 22. The angle brackets 22 serve to support the insert blocks 23 and the positioning plates 24. The front end of the angle brackets 22 is fixedly installed with a positioning plate 24 near the insert blocks 23. The insert blocks 23 can be inserted into the mounting grooves on the driver housing 37. At the same time, the positioning plate 24 will fit into the front end surface of the driver housing 37 to fix the driver housing 37.

[0032] A square sleeve 21 is slidably installed on the outer surface of the corner frame 22, and the upper end of the square sleeve 21 is fixed to the sub-frame 2. The square sleeve 21 plays a guiding role for the corner frame 22. A fixed sleeve 28 is provided on the upper end of the main frame 1 near the front of the sub-frame 2. A load-bearing shaft 26 is fitted inside the fixed sleeve 28. The fixed sleeve 28 plays the role of supporting the load-bearing shaft 26. Both ends of the load-bearing shaft 26 pass through the front and rear ends of the fixed sleeve 28. Two push ears 27 extend symmetrically from the rear end of the load-bearing shaft 26. The ends of the two push ears 27 are rotatably installed with connecting frames 29. The ends of the two connecting frames 29 are respectively connected to the two corner frames 22 for rotation. The load-bearing shaft 26 can drive the push ears 27 to rotate, thereby driving the connecting frame 29 to move to push the corner frame 22, so that the two plug blocks 23 can move synchronously toward each other.

[0033] Two sleeve frames 5 are symmetrically extended from the lower end of the fixed sleeve 28. The ends of the sleeve frames 5 are fixed to the main frame 1. The sleeve frames 5 play a role in supporting and fixing the fixed sleeve 28. The front and rear ends of the fixed sleeve 28 are fitted with limiting rings 33. The limiting rings 33 are embedded in the outer surface of the load-bearing shaft 26. The limiting rings 33 can prevent the load-bearing shaft 26 from sliding back and forth. The upper end of the fixed sleeve 28 is elastically mounted with a fixing column 30. The fixing column 30 passes through the fixed sleeve 28 and is inserted into the outer surface of the load-bearing shaft 26. The fixing column 30 can fix the load-bearing shaft 26, and then fix the plug 23 inserted in the mounting groove on the drive housing 37.

[0034] The outer surface of the fixing post 30 is slidably mounted on the fixing shell 4, and the fixing shell 4 is fixed to the fixing sleeve 28, and the fixing shell 4 plays the role of supporting the fixing post 30. The outer surface of the fixing post 30 is coaxially extended with a pressure cap 32, 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 post 30, and the pressure cap 32 is pushed by the compression spring 31. 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. The compression spring 31 can push the fixing post 30 so that the fixing post 30 can be inserted into the fixing hole 34 by itself. The outer surface of the bearing shaft 26 is provided with a fixing hole 34, and the fixing post 30 is inserted into the fixing hole 34, and the fixing hole 34 plays the role of cooperating with the fixing post 30. The front end of the bearing shaft 26 is coaxially fixed with a number 1 handwheel 35, and the number 1 handwheel 35 plays the role of facilitating the rotation of the bearing shaft 26.

[0035] When in use, first insert multiple heat sinks 38 into multiple card slots 10 of the annular array in sequence, so that the heat sink 38 is fixed in the card slots 10 by friction, and then the driver housing 37 is placed on the sub-stand 2. At this time, the positioning strips 3 will fit on both sides of the sub-stand 2, and the positioning blocks 25 will fit on both sides of the front end surfaces of the driver housing 37 to position the driver housing 37. Then, the bearing shaft 26 is rotated slightly to drive the connecting frame 29 to move through the push ears 27, and then the angle frame 22 is driven to slide in the square sleeve 21 to insert the insert block 23 into the installation slot on the driver housing 37. At the same time, the positioning plate 24 fits the front end surface of the driver housing 37. At this time, the fixing column 30 is pushed out by itself under the action of the compression spring 31 and inserted into the fixing hole 34 to fix the insert block 23 inserted in the installation slot, thereby fixing the driver housing 37 on the sub-stand 2, and then it can be The threaded rod 6 is rotated so that the thread between it and the threaded sleeve 14 drives the tooth plate 16 to move, thereby driving the gear 17 to rotate, so that the dial ring 12 on the dial shaft 8 can rotate synchronously, and the torsion spring 18 drives the carrier sleeve 9 to rotate, so that the multiple card slots 10 arranged in a ring array on the carrier sleeve 9 can be flipped. After the rear heat sink 38 is pressed and positioned on the driver housing 37, the rotation of the threaded rod 6 is stopped. At this time, the heat sink 38 can be welded to the driver housing 37 through welding equipment, and then the threaded rod 6 is continued to be rotated so that the heat sink 38 near the front of the heat sink 38 is pressed and positioned on the driver housing 37. Then the rotation of the threaded rod 6 is stopped again to weld the heat sink 38 to the driver housing 37, and so on, so that multiple heat sinks 38 are welded to the driver housing 37 and avoid being obstructed by the heat sink 38 in the front during the welding process.

[0036] It should be noted that, in this document, relational terms such as first and second, etc., are used only 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 terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0037] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary device for motor driver processing, comprising a main stand (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 shift shaft (8) is rotatably installed between the ends of the two brackets (7). The outer surface linear array of the shift shaft (8) is coaxially inlaid with multiple shift rings (12), and the outer surface linear array of the shift shaft (8) is fitted with multiple carrier sleeves (9), multiple carrier sleeves (9) and multiple shift rings (12) are staggered, and the carrier sleeves (9) and the shift rings (12) are tightly attached. A torsion spring (18) is provided between the inside of the carrier sleeve (9) and the shift ring (12), and the outer surfaces of the multiple 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 the slot bars (10) is the same as the spacing between the heat sinks, the front end of the shift shaft (8) is coaxially inlaid with a gear (17), the lower part of the gear (17) is meshed with a tooth plate (16), the tooth plate (16) is connected to the front bracket (7), the lower end of the tooth 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); The outer surfaces of the plurality of shift rings (12) are each provided with a top ear (20), the plurality of top ears (20) are arranged in a ring array, the ends of the plurality of top ears (20) are each fitted with a lug (19), and the ends of the plurality of lugs (19) are respectively fixed to the plurality of carrier sleeves (9); 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 extending from the upper end of the sub-frame (2), the positioning bars (3) being arranged in an inclined manner, two positioning blocks (25) symmetrically extending from the upper end surface of the sub-frame (2) near the front of the two positioning bars (3), two angle frames (22) symmetrically arranged at the lower end of the sub-frame (2), an insert block (23) extending from the end of the angle frame (22), and a positioning plate (24) fixedly mounted at the front end of the angle frame (22) near the insert block (23); A square sleeve (21) is slidably mounted on the outer surface of the angle frame (22), and the upper end of the square sleeve (21) is fixed to the auxiliary frame (2). A fixed sleeve (28) is provided at the upper end of the main frame (1) near the front of the auxiliary frame (2). A load-bearing shaft (26) is fitted inside the fixed sleeve (28), and both ends of the load-bearing shaft (26) pass through the front and rear ends of the fixed sleeve (28). Two push ears (27) are symmetrically extended from the rear end of the load-bearing shaft (26), and the ends of the two push ears (27) are rotatably mounted with a connecting frame (29), and the ends of the two connecting frames (29) are rotatably connected to the two angle frames (22) respectively.

2. The auxiliary device for motor driver processing according to claim 1, characterized in that: A connecting cap (15) is coaxially 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 tightly attached to the front end of the carrier sleeve (9) at the front edge. One end of the threaded rod (6) is coaxially fixedly mounted with a number two hand wheel (36).

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

5. The auxiliary device for motor driver processing according to claim 4, characterized in that: A fixed shell (4) is slidably mounted on the outer surface of the fixed column (30), and the fixed shell (4) is fixed on the fixed sleeve (28). A pressure cap (32) is coaxially extended from the outer surface of the fixed column (30), and the pressure cap (32) is slidably mounted on the inner surface of the fixed shell (4). A compression spring (31) is wound around the outer side of the fixed 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 fixed shell (4). A fixing hole (34) is opened on the outer surface of the bearing shaft (26), and the fixed 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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