Sand core mold production equipment and production process

Abstract

The invention relates to the field of mold production, in particular to sand core mold production equipment and a production process. Comprising a grinding machine body, an air cylinder is fixed to the surface of the grinding machine body, a mounting plate is fixed to the output end of the air cylinder, a sliding groove is formed in the surface of the mounting plate, and a first spring is fixed to the inner wall of the sliding groove; a limiting support is arranged on the upper end face of a gear; the sand core grinding device has the beneficial effects that the motor is started to drive one set of gears to rotate, one set of gears rotate to drive the transmission belt to rotate, the transmission belt rotates to drive the other gears to rotate, and the multiple sets of gears drive the grinding disc to rotate at high speed to grind a sand core grinding tool; and when the grinding disc grinds the irregular edge of the cavity, the edge of the cavity extrudes the grinding disc, so that the grinding disc moves in the sliding groove, and the grinding mechanism is more suitable for the irregular environment of the mold cavity.

Description

Technical Field

[0001] The invention relates to the field of mold production, and in particular to a sand core mold production device and a production process. Background Art

[0002] Sand core is the material used to make core in casting production, which is composed of casting sand, sand binder, etc.

[0003] In the prior art, in the machinery manufacturing industry, the application of sand cores is very common. By fixing the sand core at a specific position in a sand mold and then pouring molten metal around the sand core, a cavity is formed in the casting. The sand core is generally manufactured through a designated mold to achieve the purpose of mass production.

[0004] However, when producing the sand core mold, its cavity needs to be polished, and the traditional polishing method is to polish with a set of polishing discs, which has high labor intensity and low polishing efficiency. The present invention provides a sand core mold production device and a production process for solving the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a sand core mold production device and a production process to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a sand core mold production device, a grinding machine body, a cylinder is fixed on the surface of the grinding machine body, a mounting plate is fixed on the output end of the cylinder, a sliding groove is opened on the surface of the mounting plate, and a first spring is fixed on the inner wall of the sliding groove;

[0007] A gear, wherein a limiting bracket is disposed on the upper end surface of the gear, a roller is disposed at the end of the limiting bracket, a transmission belt is disposed on the outer surface of the roller, and a grinding disc is fixed on the lower end surface of the gear.

[0008] Preferably, a bracket is fixed on the surface of the grinder body, the cylinder is fixed on the surface of the bracket, a transmission block is provided inside the mounting plate, one end of the first spring is fixed on the surface of the transmission block, the first spring is located on the inner wall of the sliding groove close to the center of the mounting plate, and a positioning groove is provided on the side surface of the inner wall of the sliding groove.

[0009] Preferably, the sliding grooves are provided in multiple groups, and the multiple groups of sliding grooves are distributed circumferentially on the surface of the mounting plate. The transmission blocks are provided in multiple groups, and the multiple groups of transmission blocks are distributed circumferentially on the surface of the mounting plate. The transmission blocks correspond to and are clamped in the sliding grooves, and the two are movably connected.

[0010] Preferably, a through hole is opened on the surface of the transmission block, a baffle is fixed on the side surface of the transmission block, the baffle is connected to one end of the first spring, a roller is provided on the side surface of the transmission block, and the transmission block is movably connected to the roller.

[0011] Preferably, the positioning grooves are provided in multiple groups, which are symmetrically distributed on the side surface of the inner wall of the sliding groove, and the rollers are provided in multiple groups, which are symmetrically distributed on the side surface of the transmission block, and the rollers correspond to and are clamped in the positioning grooves, and the two are movably connected.

[0012] Preferably, a support rod is fixed to the lower end surface of the gear, a grinding disc is fixed to the end of the support rod, the support rod corresponds to and is clamped in the through hole, the two are rotatably connected, and the grinding disc is located below the mounting plate.

[0013] Preferably, the support rods are provided in a plurality of groups, and the plurality of groups of support rods are distributed in a circle inside the mounting plate, and a motor is fixed on the outer surface of one group of the support rods.

[0014] Preferably, a mounting cap is provided on the upper end surface of the gear, a connecting groove is opened on the surface of the mounting cap, the connecting groove is connected to the inner wall of the mounting cap, a second spring, a push block and a top block are provided on the inner wall of the connecting groove, elastic gaskets are fixed at both ends of the top block, and one end of the top block is a slope.

[0015] Preferably, the top block corresponds to the tooth groove of the gear, a limiting block is fixed on the upper surface of the mounting cap, a connecting block is provided on the upper surface of the top block, a limiting groove is provided on the surface of the connecting block, the limiting block corresponds to the limiting groove, and a storage block is fixed on the outer surface of the connecting block.

[0016] Preferably, a storage groove is provided at the end of the storage block, the storage groove is provided near the port, a third spring is provided on the inner wall of the storage groove, the limit bracket is located on the inner wall of the storage groove, a top plate is fixed on the end of the limit bracket, and the third spring is sleeved on the surface of the limit bracket.

[0017] Preferably, the tooth grooves on the outer surface of the transmission belt correspond to and are clamped with the gears, the inner surface of the transmission belt is a smooth surface, the roller is in contact with the inner surface of the transmission belt, and the lower end surface of the mounting cap is located above the upper surface of the transmission belt.

[0018] A production process according to the above-mentioned sand core mold production equipment comprises the following steps:

[0019] Step 1: Grinding. Place the sand core mold on the grinding table of the grinder main body under the mounting plate. Start the cylinder to drive the grinding disc down to the specified height through the mounting plate. Start the motor to drive one set of gears to rotate. The rotation of one set of gears will drive the transmission belt to rotate. The rotation of the transmission belt will drive the remaining gears to rotate. Multiple sets of gears drive the grinding disc to rotate at high speed to grind the sand core mold, which improves the grinding efficiency and makes the sand core mold more completely polished.

[0020] Step 2: Limiting. When the grinding disc grinds to the irregular edge of the cavity, the edge of the cavity will squeeze the grinding disc, causing the grinding disc to move in the sliding groove, so that the grinding mechanism can better adapt to the irregular environment of the mold cavity. At the same time, since the transmission belt is elastic and is restricted by the limiting bracket, the transmission belt is always stuck with the gear, preventing the grinding disc from being separated from the transmission belt when it moves. The limiting bracket is in a 'V' shape, which increases the contact area between the grinding disc and the transmission belt when the grinding disc moves. At the same time, the limiting bracket is provided with a roller, which reduces the friction force of the limiting bracket when limiting the transmission belt. The limiting bracket is stuck on the limiting block, and the two are movably connected. The mounting cap is located above the gear. The second spring will push the push block to push the top block to move toward the axis center, so that the top block is stuck and held in the tooth groove of the gear, and elastic gaskets are fixed at both ends of the top block. The elastic gasket will cause a reaction force on the push block to prevent the push block from being separated, and at the same time prevent the mounting cap from being separated from the gear.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The starting motor drives one of the groups of gears to rotate, and the rotation of one group of gears will drive the transmission belt to rotate, and the rotation of the transmission belt will drive the remaining gears to rotate, and multiple groups of gears drive the grinding disc to rotate at high speed to grind the sand core mold; when the grinding disc grinds to the irregular edge of the cavity, the edge of the cavity will squeeze the grinding disc, causing the grinding disc to move in the sliding groove, so that the grinding mechanism can better adapt to the irregular environment of the mold cavity; under the restriction of the limit bracket, the transmission belt is always stuck with the gear to prevent the phenomenon that the grinding disc will be separated from the transmission belt when it moves; the limit bracket is in a 'V' shape, so that the contact area between the grinding disc and the transmission belt is increased when the grinding disc moves; the limit bracket is provided with a roller, which reduces the friction of the limit bracket when limiting the transmission belt, thereby improving the grinding efficiency of the sand core mold cavity and reducing the work intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a three-dimensional schematic diagram of the grinding assembly structure of the present invention;

[0025] Figure 3 It is a three-dimensional schematic diagram of the grinding disc structure of the present invention;

[0026] Figure 4 It is a three-dimensional schematic diagram of the mounting plate structure of the present invention;

[0027] Figure 5 It is a three-dimensional schematic diagram of the other side of the mounting plate structure of the present invention;

[0028] Figure 6 It is a three-dimensional schematic diagram of the transmission block structure of the present invention;

[0029] Figure 7 It is a cutaway perspective schematic diagram of the mounting cap structure of the present invention;

[0030] Figure 8 It is a partial cross-sectional schematic diagram of the limiting bracket assembly structure of the present invention.

[0031] In the figure: 1. grinder body; 2. bracket; 3. mounting plate; 4. cylinder; 5. transmission belt; 6. gear; 7. motor; 8. grinding disc; 9. support rod; 10. limit bracket; 11. roller; 12. transmission block; 13. first spring; 14. slide groove; 15. positioning groove; 16. through hole; 17. roller; 18. baffle; 19. storage block; 20. push block; 21. mounting cap; 22. top block; 23. limit block; 24. elastic gasket; 25. connecting groove; 26. second spring; 27. connecting block; 28. limit groove; 29. ​​storage groove; 30. top plate; 31. third spring; 32. notch. DETAILED DESCRIPTION

[0032] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figures 1 to 6 The present invention provides a technical solution: a sand core mold production equipment and production process.

[0034] Embodiment 1, a sand core mold production equipment, including: a cylinder 4 is fixed on the surface of a grinder body 1, a mounting plate 3 is fixed on the output end of the cylinder 4, and the cylinder 4 is started to drive the grinding disc 8 to descend to a specified height through the mounting plate 3. A sliding groove 14 is opened on the surface of the mounting plate 3. It is well known that the mold cavity is usually irregular in shape. When the grinding disc 8 grinds to the irregular edge of the cavity, the edge of the cavity will squeeze the grinding disc 8, so that the grinding disc 8 moves in the sliding groove 14, so that the grinding mechanism can better adapt to the irregular environment of the mold cavity. A first spring 13 is fixed on the inner wall of the sliding groove 14, and the first spring 13 realizes the function that the grinding disc 8 can move with the shape of the cavity.

[0035] A limit bracket 10 is provided on the upper end face of the gear 6. Under the restriction of the limit bracket 10, the transmission belt 5 is always stuck with the gear 6 to prevent the grinding disc 8 from being separated from the transmission belt 5 when it moves. The limit bracket 10 is in a 'V' shape, so that the contact area between the grinding disc 8 and the transmission belt 5 increases when the grinding disc 8 moves. A roller 11 is provided at the end of the limit bracket 10. The limit bracket 10 is provided with a roller 11, which reduces the friction force of the limit bracket 10 when limiting the transmission belt 10. The outer surface of the roller 11 is provided with a transmission belt 5. The starting motor 7 drives one group of gears 6 to rotate. The rotation of one group of gears 6 will drive the transmission belt 5 to rotate. The rotation of the transmission belt 5 will drive the remaining gears 6 to rotate. A grinding disc 8 is fixed to the lower end face of the gear 6.

[0036] On the basis of Example 1, in order to improve the grinding efficiency of the sand core mold, a bracket 2 is fixed on the surface of the grinder body 1, a cylinder 4 is fixed on the surface of the bracket 2, a transmission block 12 is provided inside the mounting plate 3, one end of the first spring 13 is fixed on the surface of the transmission block 12, the first spring 13 is located on the inner wall of the sliding groove 14 close to the center of the mounting plate 3, and a positioning groove 15 is provided on the side surface of the inner wall of the sliding groove 14.

[0037] There are multiple groups of sliding grooves 14, which are circumferentially distributed on the surface of the mounting plate 3. There are multiple groups of transmission blocks 12, which are circumferentially distributed on the surface of the mounting plate 3. The transmission blocks 12 correspond to and are clamped with the sliding grooves 14, and the two are movably connected.

[0038] A through hole 16 is formed on the surface of the transmission block 12 , a baffle 18 is fixed to the side surface of the transmission block 12 , the baffle 18 is connected to one end of the first spring 13 , a roller 17 is formed on the side surface of the transmission block 12 , and the transmission block 12 and the roller 17 are movably connected.

[0039] There are multiple groups of positioning grooves 15, which are symmetrically distributed on the inner wall side surface of the sliding groove 14. There are multiple groups of rollers 17, which are symmetrically distributed on the side surface of the transmission block 12. The rollers 17 correspond to the positioning grooves 15 and are clamped, and the two are movably connected.

[0040] A support rod 9 is fixed to the lower end surface of the gear 6 , and a grinding disc 8 is fixed to the end of the support rod 9 . The support rod 9 corresponds to and is clamped in the through hole 16 , and the two are rotatably connected. The grinding disc 8 is located below the mounting plate 3 .

[0041] There are multiple groups of support rods 9, which are distributed in a circle inside the mounting plate 3. The motor 7 is fixed to the outer surface of one group of support rods 9.

[0042] A mounting cap 21 is provided on the upper end surface of the gear 6, and a connecting groove 25 is opened on the surface of the mounting cap 21. The connecting groove 25 is connected to the inner wall of the mounting cap 21. The inner wall of the connecting groove 25 is provided with a second spring 26, a push block 20 and a top block 22. Elastic gaskets 24 are fixed at both ends of the top block 22, and one end of the top block 22 is a slope.

[0043] The top block 22 corresponds to the tooth groove of the gear 6, a limiting block 23 is fixed on the upper surface of the mounting cap 21, a connecting block 27 is provided on the upper surface of the top block 22, a limiting groove 28 is provided on the surface of the connecting block 27, the limiting block 23 corresponds to the limiting groove 28, and a storage block 19 is fixed on the outer surface of the connecting block 27.

[0044] A storage groove 29 is provided at the end of the storage block 19, and a 32 is provided near the end of the storage groove 29. A third spring 31 is provided on the inner wall of the storage groove 29. The limit bracket 10 is located on the inner wall of the storage groove 29. A top plate 30 is fixed at the end of the limit bracket 10, and the third spring 31 is sleeved on the surface of the limit bracket 10.

[0045] The tooth grooves on the outer surface of the transmission belt 5 correspond to and are clamped with the gear 6 , the inner surface of the transmission belt 5 is a smooth surface, the roller 11 is in contact with the inner surface of the transmission belt 5 , and the lower end surface of the mounting cap 21 is located above the upper surface of the transmission belt 5 .

[0046] The present invention also discloses a production process according to the above-mentioned sand core mold production equipment, comprising the following steps:

[0047] Step 1: grinding, placing the sand core mold on the grinding table of the grinding machine main body 1 below the mounting plate 3, starting the cylinder 4 to drive the grinding disc 8 to descend to the specified height through the mounting plate 3, starting the motor 7 to drive one set of gears 6 to rotate, the rotation of one set of gears 6 will drive the transmission belt 5 to rotate, the rotation of the transmission belt 5 will drive the remaining gears 6 to rotate, and multiple sets of gears 6 drive the grinding disc 8 to rotate at high speed to grind the sand core mold, thereby improving the grinding efficiency and making the sand core mold grind more completely;

[0048] Step 2: Limiting. When the grinding disc 8 grinds to the irregular edge of the cavity, the edge of the cavity will squeeze the grinding disc 8, so that the grinding disc 8 moves in the slide groove 14, so that the grinding mechanism is more adaptable to the irregular environment of the mold cavity. At the same time, because the transmission belt 5 is elastic and is limited by the limiting bracket 10, the transmission belt 5 is always stuck with the gear 6, which prevents the grinding disc 8 from being separated from the transmission belt 5 when it moves. The limiting bracket 10 is in a 'V' shape, so that the contact area between the grinding disc 8 and the transmission belt 5 is increased when it moves. At the same time The limiting bracket 10 is provided with a roller 11, which reduces the friction force of the limiting bracket 10 when limiting the transmission belt 10. The limiting bracket 10 is clamped on the limiting block 23, and the two are movably connected. The mounting cap 21 is located above the gear 6. The second spring 26 will push the push block 20 to push the top block 22 to move toward the axis center, so that the top block 22 is clamped and held in the tooth groove of the gear 6, and elastic gaskets 24 are fixed at both ends of the top block 22. The elastic gasket 24 will cause a reaction force on the push block 20 to prevent the push block 20 from detaching, and at the same time prevent the mounting cap 21 from detaching from the gear 6.

[0049] When the sand core mold cavity is polished, the sand core mold is first placed on the polishing table of the polishing machine main body 1 under the mounting plate 3, and then the cylinder 4 is started to drive the polishing disc 8 to descend to the specified height through the mounting plate 3, and then the motor 7 is started to drive one of the groups of gears 6 to rotate, and the rotation of one group of gears 6 will drive the transmission belt 5 to rotate, and the rotation of the transmission belt 5 will drive the remaining gears 6 to rotate, and multiple groups of gears 6 drive the polishing disc 8 to rotate at high speed to polish the sand core mold, thereby improving the polishing efficiency and making the sand core mold polished more completely; it is well known that the mold cavity is usually irregular in shape, and when the polishing disc 8 polishes to the edge of the irregular cavity, the edge of the cavity will squeeze the polishing disc 8, so that the polishing disc 8 moves in the sliding groove 14, so that the polishing mechanism is more adaptable to the irregular environment of the mold cavity, and at the same time, because the transmission belt 5 is elastic and is restricted by the limit bracket 10, the transmission belt 5 is always stuck with the gear 6 to prevent The movement of the grinding disc 8 will cause it to be separated from the transmission belt 5. The limit bracket 10 is in a 'V' shape, so that the contact area between the grinding disc 8 and the transmission belt 5 is increased when the grinding disc 8 moves. At the same time, the limit bracket 10 is provided with a roller 11, which reduces the friction force of the limit bracket 10 when limiting the transmission belt 10; the limit bracket 10 is clamped on the limit block 23, and the two are movably connected. The mounting cap 21 is located above the gear 6, and the second spring 26 will push the push block 20 to push the top block 22 to move toward the axis center, so that the top block 22 is clamped and held in the tooth groove of the gear 6, and elastic gaskets 24 are fixed at both ends of the top block 22. The elastic gasket 24 will cause a reaction force on the push block 20 to prevent the push block 20 from detaching, and at the same time prevent the mounting cap 21 from detaching from the gear 6; the limit bracket 10 is a telescopic structure, and the length of the limit bracket 10 can be adjusted according to the transmission belt 5 of different sizes, which improves practicality; thereby achieving the improvement of the grinding efficiency of the sand core mold cavity and reducing the work intensity.

[0050] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sand core mold production equipment, Features: include: A grinding machine body (1), a cylinder (4) is fixed on the surface of the grinding machine body (1), a mounting plate (3) is fixed on the output end of the cylinder (4), a sliding groove (14) is opened on the surface of the mounting plate (3), and a first spring (13) is fixed on the inner wall of the sliding groove (14); A gear (6), wherein a limiting bracket (10) is provided on the upper end surface of the gear (6), a roller (11) is provided at the end of the limiting bracket (10), a transmission belt (5) is provided on the outer surface of the roller (11), and a grinding disc (8) is fixed on the lower end surface of the gear (6).

2. A sand core mold production equipment according to claim 1, Features: A bracket (2) is fixed on the surface of the grinding machine body (1), the cylinder (4) is fixed on the surface of the bracket (2), a transmission block (12) is provided inside the mounting plate (3), one end of the first spring (13) is fixed on the surface of the transmission block (12), the first spring (13) is located on the inner wall of a sliding groove (14) close to the center of the mounting plate (3), and a positioning groove (15) is provided on the side surface of the inner wall of the sliding groove (14).

3. A sand core mold production equipment according to claim 2, Features: The sliding grooves (14) are provided in a plurality of groups, and the plurality of groups of the sliding grooves (14) are distributed circumferentially on the surface of the mounting plate (3); the transmission blocks (12) are provided in a plurality of groups, and the plurality of groups of the transmission blocks (12) are distributed circumferentially on the surface of the mounting plate (3); the transmission blocks (12) correspond to and are clamped with the sliding grooves (14), and the two are movably connected.

4. A sand core mold production equipment according to claim 3, Features: A through hole (16) is provided on the surface of the transmission block (12); a baffle (18) is fixed on the side surface of the transmission block (12); the baffle (18) is connected to one end of the first spring (13); a roller (17) is provided on the side surface of the transmission block (12); and the transmission block (12) and the roller (17) are movably connected.

5. A sand core mold production equipment according to claim 4, Features: The inner wall side surface of the sliding groove (14) is provided with a positioning groove (15), the rollers (17) are symmetrically distributed on the side surface of the transmission block (12), a support rod (9) is fixed to the lower end surface of the gear (6), a grinding disc (8) is fixed to the end of the support rod (9), the support rod (9) corresponds to and is clamped with the through hole (16), and the two are rotatably connected, and the grinding disc (8) is located below the mounting plate (3).

6. A sand core mold production equipment according to claim 5, Features: A motor (7) is fixed to one group of outer surfaces of the support rod (9); a mounting cap (21) is provided on the upper end surface of the gear (6); a connecting groove (25) is provided on the surface of the mounting cap (21); the connecting groove (25) is connected to the inner wall of the mounting cap (21); a second spring (26), a push block (20) and a top block (22) are provided on the inner wall of the connecting groove (25); elastic gaskets (24) are fixed at both ends of the top block (22); and one end of the top block (22) is an inclined surface.

7. A sand core mold production device according to claim 6, Features: The top block (22) corresponds to the tooth groove of the gear (6); a limit block (23) is fixed on the upper surface of the mounting cap (21); a connecting block (27) is provided on the upper surface of the top block (22); a limit groove (28) is provided on the surface of the connecting block (27); the limit block (23) corresponds to the limit groove (28); and a storage block (19) is fixed on the outer surface of the connecting block (27).

8. A sand core mold production device according to claim 7, Features: The end of the storage block (19) is provided with a storage groove (29), the storage groove (29) is provided with a port (32), the inner wall of the storage groove (29) is provided with a third spring (31), the limit bracket (10) is located on the inner wall of the storage groove (29), the end of the limit bracket (10) is fixed with a top plate (30), and the third spring (31) is sleeved on the surface of the limit bracket (10).

9. A sand core mold production device according to claim 8, Features: The tooth grooves on the outer surface of the transmission belt (5) correspond to and are clamped on the gear (6); the inner surface of the transmission belt (5) is a smooth surface; the roller (11) is in contact with the inner surface of the transmission belt (5); and the lower end surface of the mounting cap (21) is located above the upper surface of the transmission belt (5).

10. A production process of a sand core mold production device according to any one of claims 1 to 9, Features: The following steps are involved: Step 1: grinding, placing the sand core mold on the grinding table of the grinding machine body (1) below the mounting plate (3), starting the cylinder (4) to drive the grinding disc (8) to descend to a specified height through the mounting plate (3), starting the motor (7) to drive one set of gears (6) to rotate, the rotation of one set of gears (6) will drive the transmission belt (5) to rotate, the rotation of the transmission belt (5) will drive the other gears (6) to rotate, and the multiple sets of gears (6) drive the grinding disc (8) to rotate at high speed to grind the sand core mold, thereby improving the grinding efficiency and making the sand core mold more completely grinded; Step 2: Limiting. When the grinding disc (8) grinds to the irregular edge of the cavity, the edge of the cavity will squeeze the grinding disc (8), causing the grinding disc (8) to move in the slide groove (14), so that the grinding mechanism can better adapt to the irregular environment of the mold cavity. At the same time, because the transmission belt (5) is elastic and is limited by the limiting bracket (10), the transmission belt (5) is always stuck with the gear (6), preventing the grinding disc (8) from being separated from the transmission belt (5) when it moves. The limiting bracket (10) is in a 'V' shape, so that the contact area between the grinding disc (8) and the transmission belt (5) is increased when the grinding disc (8) moves. At the same time, the limiting bracket (10) ) is provided with a roller (11), which reduces the friction force of the limiting bracket (10) when limiting the transmission belt (10). The limiting bracket (10) is clamped on the limiting block (23), and the two are movably connected. The mounting cap (21) is located above the gear (6). The second spring (26) pushes the push block (20) to push the top block (22) to move toward the axis center, so that the top block (22) is clamped and held in the tooth groove of the gear (6), and elastic gaskets (24) are fixed at both ends of the top block (22). The elastic gasket (24) will cause a reaction force on the push block (20) to prevent the push block (20) from detaching, and at the same time prevent the mounting cap (21) from detaching from the gear (6).

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