CN221145179U - Planetary gear reducer - Google Patents

Abstract

The utility model relates to the technical field of planetary gear reducers, in particular to a planetary gear reducer. The planetary gear reducer comprises a driving motor, a planetary gear reducer shell, a first planetary gear set and a second planetary gear set, wherein the driving motor is fixedly arranged on one side of the planetary gear reducer shell, a fixed disc is fixedly arranged at the front end of the driving motor, an output shaft of the driving motor penetrates through the fixed disc to be clamped with the first planetary gear set, clamping blocks I are arranged on two sides of the fixed disc, and a fixing assembly I fixed to the fixed disc is arranged inside the planetary gear reducer shell. According to the planetary gear reducer, through the design of the first fixing component, the driving motor can be quickly fixed on the planetary gear reducer shell in a plug-in rotating mode, and the installation efficiency of the planetary gear reducer is improved.

Description

Planetary gear reducer

Technical Field

The utility model relates to the technical field of planetary gear reducers, in particular to a planetary gear reducer.

Background

The planetary reducer is an industrial product with wide application, can reduce the rotating speed of a motor and increase the output torque. The planetary reducer can be used as a matching component for industries such as lifting, excavating, transporting, building and the like.

For example, chinese patent (CN 202222701641.2) discloses a planetary gear reducer, which includes a planetary gear reducer housing, a first-stage planetary gear set, a second-stage planetary gear set, a first-stage planetary carrier and a second planetary carrier, wherein an inner gear ring corresponding to both the first-stage planetary gear set and the second-stage planetary gear set is provided on an inner wall of the planetary gear reducer housing, both the first-stage planetary gear set and the second-stage planetary gear set can rotate on the inner gear ring, a middle part of the first-stage planetary gear set is rotatably connected with a power input shaft, the first-stage planetary gear set is connected with the first-stage planetary carrier, the second-stage planetary gear set is connected with the second planetary carrier, a power output shaft is provided on the second planetary carrier, and the power output shaft extends from one port of the planetary gear reducer housing to an outer side of the planetary gear reducer housing. Compared with the two-stage planetary gear speed reducer in the prior art, the planetary gear speed reducer has the advantages of fewer parts, simpler installation mode, simple and convenient assembly, higher assembly efficiency and low maintenance cost.

When the above technology is used, the following technical problems are found in the prior art: when the device is used for fixing the driving motor and the planetary gear reducer shell, the driving motor and the planetary gear reducer shell are required to be fixed through screwing of a plurality of bolts, the operation is complex, and the installation efficiency is low; on the other hand, when the output shaft of the driving motor in the device is fixed, the output shaft of the driving motor needs to be inserted into the middle part of the first planetary gear set, so that when the driving motor is fixed with the planetary gear reducer shell, an operator needs to firstly mesh a transmission gear I on the output shaft of the driving motor with a gear I on the first planetary gear set, and then the driving motor and the planetary gear reducer shell can be fixed.

Disclosure of utility model

In view of the foregoing, it is desirable to provide a planetary gear reducer that can be quickly installed.

In order to solve the technical problems, the utility model adopts the following technical scheme:

The utility model provides a planetary gear reducer, includes driving motor, planetary gear reducer shell, first planetary gear set and second planetary gear set, driving motor is fixed to be located one side of planetary gear reducer shell, driving motor's front end has set firmly the fixed disk, driving motor's output shaft runs through the fixed disk is clamped with first planetary gear set mutually, the both sides of fixed disk are equipped with fixture block one, planetary gear reducer shell's inside is equipped with the fixed subassembly one fixed to the fixed disk.

Preferably, the first fixing component comprises a plurality of L-shaped inserting grooves I designed in the planetary gear reducer shell, one end parts of the L-shaped inserting grooves are communicated with first clamping grooves, one ends of the first clamping grooves close to the inner side are fixedly provided with first compression springs, the other ends of the first compression springs are fixedly provided with first pushing plates, one sides of the first clamping grooves are fixedly provided with first limiting blocks matched with one side surface of the first pushing plates, and the outer end surfaces of the first pushing plates and the first limiting blocks are flush with the inner side walls of the first L-shaped inserting grooves;

The planetary gear reducer shell is internally provided with a plurality of first mounting grooves communicated with the first clamping grooves, one side, far away from the first push plate, of the first mounting grooves is fixedly provided with a second compression spring, the other end of the second compression spring is fixedly provided with a first L-shaped clamping plate for clamping the first push plate, and the first L-shaped clamping plate is fixedly provided with a first arc-shaped block matched with the first clamping block.

Preferably, the first planetary gear set comprises a plurality of first gears in annular design, a plurality of first gears are meshed with a transmission gear around the center of a circle, a first transmission shaft is fixedly arranged in the middle of the first gears, a first planetary gear carrier is fixedly arranged at the other end of the first transmission shaft, a second transmission gear is fixedly arranged in the middle of the first planetary gear carrier, and the second transmission gear is arranged in the middle of the second planetary gear set.

Preferably, the second planetary gear set comprises a plurality of gears II meshed with the transmission gears II and distributed in a ring shape, a transmission shaft II is fixedly arranged in the middle of the gears II, a second planetary gear carrier is fixedly arranged at the other end of the transmission shaft II, a power output shaft is fixedly arranged in the middle of the second planetary gear carrier, and an inner gear ring matched with the first planetary gear set and the second planetary gear set is fixedly arranged in the planetary gear reducer shell.

Preferably, a connecting shaft is fixedly arranged in the middle of the first transmission gear, a shaft sleeve is fixedly arranged at the end part of the connecting shaft, clamping blocks II are fixedly arranged on two sides of the output shaft of the driving motor, and a fixing assembly II which is used for fixing the output shaft is arranged in the shaft sleeve.

Preferably, the second fixing component comprises a plurality of L-shaped inserting grooves II designed in the shaft sleeve, the end parts of the L-shaped inserting grooves II are communicated with clamping grooves II, one end of the inner side of each clamping groove II is fixedly provided with a compression spring III, the other end of each compression spring III is fixedly provided with a pushing plate II, one side of each clamping groove II is fixedly provided with a limiting block II matched with the side surface of each pushing plate II, and the outer end surfaces of the pushing plates II and the limiting blocks II are flush with the inner side wall of each L-shaped inserting groove II;

The inside of axle sleeve is equipped with a plurality of mounting grooves two that are linked together with joint groove, the mounting groove is second keep away from one side of push pedal two has set firmly compression spring four, compression spring four's the other end has set firmly the L shape joint board two to push pedal two joint, set firmly on the L shape joint board two with fixture block two matched with arc piece two.

It can be clearly seen that the technical problems to be solved by the present application can be necessarily solved by the above-mentioned technical solutions of the present application.

Meanwhile, through the technical scheme, the utility model has at least the following beneficial effects:

1. According to the planetary gear reducer, through the design of the first fixing component, the driving motor can be quickly fixed on the planetary gear reducer shell in a plug-in rotating mode, and the installation efficiency of the planetary gear reducer is improved.

2. According to the planetary gear reducer, through the design of the second fixing component, the output shaft of the driving motor is clamped with the output shaft of the first transmission gear on the first planetary gear set, so that the driving motor and the planetary gear reducer shell are conveniently and synchronously fixed with the output shaft of the driving motor and the connecting shaft of the first transmission gear, and the installation efficiency of the planetary gear reducer is further improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic diagram of a split structure of the present utility model;

FIG. 3 is a schematic diagram of a planetary gear reducer housing of the present utility model;

FIG. 4 is a schematic structural view of a first fixing assembly according to the present utility model;

FIG. 5 is a schematic diagram of a driving motor and a first planetary gear set according to the present utility model;

Fig. 6 is a schematic structural diagram of a second fixing assembly of the present utility model.

In the figure: 1. a driving motor; 2. a planetary gear reducer housing; 3. a first planetary gear set; 4. a second planetary gear set; 5. a fixed plate; 6. a clamping block I; 7. an L-shaped inserting groove I; 8. the clamping groove I; 9. compressing a first spring; 10. a pushing plate I; 11. a first limiting block; 12. compression spring II; 13. an L-shaped clamping plate I; 14. arc-shaped block I; 15. a first gear; 16. a first transmission gear; 17. a transmission shaft I; 18. a first planet carrier; 19. a transmission gear II; 20. a second gear; 21. a transmission shaft II; 22. a second planetary carrier; 23. a power output shaft; 24. an inner gear ring; 25. a connecting shaft; 26. a shaft sleeve; 27. a clamping block II; 28. an L-shaped inserting groove II; 29. a clamping groove II; 30. compression spring III; 31. a pushing plate II; 32. a second limiting block; 33. compression spring IV; 34. an L-shaped clamping plate II; 35. arc-shaped block II.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Example 1

Referring to fig. 1-4, a planetary gear reducer comprises a driving motor 1, a planetary gear reducer housing 2, a first planetary gear set 3 and a second planetary gear set 4, wherein the driving motor 1 is fixedly arranged on one side of the planetary gear reducer housing 2, a fixed disc 5 is fixedly arranged at the front end of the driving motor 1, an output shaft of the driving motor 1 penetrates through the fixed disc 5 to be clamped with the first planetary gear set 3, clamping blocks I6 are arranged on two sides of the fixed disc 5, and a fixed assembly I fixed to the fixed disc 5 is arranged inside the planetary gear reducer housing 2.

Through the design of fixed subassembly one for driving motor 1 can be through pegging graft rotatory mode quick fixed on planetary gear reducer shell 2, has abandoned traditional bolted connection's fixed mode, has simplified driving motor 1 and planetary gear reducer shell 2's fixed flow, has improved planetary gear reducer's installation effectiveness.

Referring to fig. 2-4, the first fixing component comprises a plurality of L-shaped inserting grooves 7 which are designed in the planetary gear reducer shell 2, one end part of each L-shaped inserting groove 7 is communicated with a clamping groove 8, one end of each clamping groove 8 close to the inner side is fixedly provided with a first compression spring 9, the other end of each compression spring 9 is fixedly provided with a first push plate 10, one side of each clamping groove 8 is fixedly provided with a first limiting block 11 which is matched with the side surface of the corresponding first push plate 10, and the outer end surfaces of the first push plates 10 and the first limiting blocks 11 are flush with the inner side wall of each L-shaped inserting groove 7;

The planetary gear reducer shell 2 is internally provided with a plurality of first mounting grooves communicated with the first clamping grooves 8, one sides of the first mounting grooves far away from the first push plate 10 are fixedly provided with second compression springs 12, the other ends of the second compression springs 12 are fixedly provided with first L-shaped clamping plates 13 which are clamped with the first push plate 10, and the first L-shaped clamping plates 13 are fixedly provided with first arc-shaped blocks 14 matched with the first clamping blocks 6; specifically, in the utility model, through the design of the compression spring I9, the push plate I10 and the clamping block I6, the driving motor 1 can be fast fixed with the shell of the planetary gear reducer, when the driving motor 1 is fixed, an operator only needs to slide the clamping block I6 at two sides of the fixed disc 5 inwards along the L-shaped inserting groove 7I formed in the planetary gear reducer shell 2, when the clamping block I6 is placed into the bottom of the L-shaped inserting groove 7I, the driving motor 1 is rotated clockwise to enable the clamping block I6 to move towards the clamping groove I8 along the L-shaped inserting groove 7, the arc-shaped block I14 is extruded, so that the arc-shaped block I14 pushes the L-shaped clamping plate I13 to shrink inwards and gradually separate from the front end face of the push plate I10, and at the moment, the push plate I10 drives the clamping block I6 to move towards the outer side of the clamping groove I8 under the action of the compression spring I9 until the top end of the clamping block I6 is attached to the clamping groove I8, and the driving motor 1 and the planetary gear reducer shell 2 are fixed;

It should be noted that, in this embodiment, the cross-sectional dimensions of the L-shaped inserting groove 7 and the clamping groove 8 are matched with the cross-sectional dimension of the clamping block 6, so that the clamping block 6 can move inside the L-shaped inserting groove 7 and the clamping groove 8 conveniently, and the normal use of the fixing assembly is ensured;

On the other hand; the position of the first push plate 10 is limited through the design of the first arc-shaped block 14, the first L-shaped clamping plate 13 and the second compression spring 12, so that the first push plate 10 is tightly arranged in the first clamping groove 8 when the first clamping block 6 is not fixed, at the moment, the outer end surface of the first push plate 10 is flush with the inner side wall of the L-shaped inserting groove 7, and therefore the normal movement of the first clamping block 6 in the first clamping groove is ensured, and the normal use of the first fixing assembly is maintained;

When the driving motor 1 and the planetary gear reducer shell 2 need to be disassembled, an operator only needs to press the driving motor 1 inwards, so that the clamping block I6 drives the pushing plate I10 to move inwards along the clamping groove I8 and extrudes the arc-shaped block I14, at the moment, the L-shaped clamping plate is placed into the mounting groove I under the driving of the arc-shaped block I14, when the bottom of the clamping block I6 is leveled with the inner wall of the L-shaped inserting groove 7, the driving motor 1 is rotated anticlockwise, the driving motor 1 is pulled out outwards along the L-shaped inserting groove 7, and in the anticlockwise rotation process of the driving motor 1, the arc-shaped block I14 and the L-shaped clamping plate I13 are outwards ejected under the action of the compression spring II 12, and the position of the pushing plate I10 is limited, so that the assembly I is fixed next time for normal use.

Referring to fig. 2, the first planetary gear set 3 includes a plurality of gears 15 in a ring shape, a transmission gear 16 is meshed with the plurality of gears 15 around a center of a circle formed, a transmission shaft 17 is fixedly arranged in the middle of the gears 15, a first planetary gear carrier 18 is fixedly arranged at the other end of the transmission shaft 17, a transmission gear 19 is fixedly arranged in the middle of the first planetary gear carrier 18, and the transmission gear 19 is arranged in the middle of the second planetary gear set 4;

The second planetary gear set 4 comprises a plurality of gears 20 meshed with a transmission gear 19 and distributed in a ring shape, a transmission shaft 21 is fixedly arranged in the middle of the gears 20, a second planetary gear carrier 22 is fixedly arranged at the other end of the transmission shaft 21, a power output shaft 23 is fixedly arranged in the middle of the second planetary gear carrier 22, an inner gear ring 24 matched with the first planetary gear set 3 and the second planetary gear set 4 is fixedly arranged in the planetary gear reducer shell 2, and concretely, the two planetary gear sets are designed, so that the first planetary gear set 3 is connected with an output shaft of the driving motor 1, the driving motor 1 drives the first planetary gear set 3 to rotate on the inner gear ring 24 fixedly arranged in the planetary gear reducer shell 2 through the output shaft, and drives the first planetary gear carrier 18 to rotate through the transmission shaft 17, and simultaneously, the transmission gear 19 fixedly arranged in the middle of the first planetary gear carrier 18 drives the second planetary gear set 4 to rotate along with the rotation of the first planetary gear carrier 18, and drives the second planetary gear carrier 22 to rotate through the transmission shaft 21, so that the power output shaft 23 on the second planetary gear set 22 is rotated, and two stages of speed reduction is completed.

Example two

The embodiment is further optimized based on the first embodiment, when the output shaft of the driving motor 1 in the planetary gear reducer is fixed, the output shaft of the driving motor 1 needs to be inserted into the middle of the first planetary gear set 3, so that when the driving motor 1 is fixed with the planetary gear reducer shell 2, an operator needs to mesh the first transmission gear 16 on the output shaft of the driving motor 1 with the first gear 15 on the first planetary gear set 3, and then the driving motor 1 and the planetary gear reducer shell 2 can be fixed, and because the meshing difficulty between the gears is high, a certain improvement space exists;

Referring to fig. 5, a connecting shaft 25 is fixedly arranged in the middle of the first transmission gear 16, a shaft sleeve 26 is fixedly arranged at the end part of the connecting shaft 25, two clamping blocks 27 are fixedly arranged at two sides of the output shaft of the driving motor 1, and a second fixing component for fixing the output shaft is arranged in the shaft sleeve 26; specifically, in the utility model, through the design of the second fixing component, the output shaft of the driving motor 1 can be rotationally clamped with the shaft sleeve 26 while the fixing disc 5 is rotationally clamped with the planetary gear reducer shell 2, so that the synchronous fixation of the driving motor 1 and the planetary gear reducer shell 2 and the output shaft of the driving motor 1 and the connecting shaft 25 of the first transmission gear 16 is realized, and the installation efficiency of the planetary gear reducer is further improved while the installation difficulty of an operator is reduced.

Referring to fig. 6, the second fixing component includes a plurality of second L-shaped inserting grooves 28 designed in the shaft sleeve 26, the end parts of the second L-shaped inserting grooves 28 are communicated with a second clamping groove 29, one end of the second clamping groove 29 close to the inner side is fixedly provided with a third compression spring 30, the other end of the third compression spring 30 is fixedly provided with a second push plate 31, one side of the second clamping groove 29 is fixedly provided with a second limiting block 32 matched with the side surface of the second push plate 31, and the outer end surfaces of the second push plate 31 and the second limiting block 32 are flush with the inner side wall of the second L-shaped inserting groove 28;

The inside of the shaft sleeve 26 is provided with a plurality of second mounting grooves communicated with the second clamping grooves 29, one side of the second mounting grooves, which is far away from the second push plate 31, is fixedly provided with a fourth compression spring 33, the other end of the fourth compression spring 33 is fixedly provided with a second L-shaped clamping plate 34 which is clamped with the second push plate 31, and the second L-shaped clamping plate 34 is fixedly provided with a second arc-shaped block 35 matched with the second clamping block 27; specifically, in the utility model, the matching mode of the fixing component II and the fixing component I is the same, the output shaft of the driving motor 1 and the connecting shaft 25 of the transmission gear I16 are synchronously fixed while the driving motor 1 and the planetary gear reducer housing 2 are fixed through the fixing component I, so that an operator can realize synchronous fixation of the driving motor 1 and the planetary gear reducer housing 2 and the connecting shaft 25 of the driving motor 1 and the output shaft of the transmission gear I16 only by inserting and rotating the fixing disc 5 at the front end of the driving motor 1 along the L-shaped inserting groove 7I when installing the planetary gear reducer, thereby effectively reducing the working difficulty of the operator and improving the installation efficiency of the planetary gear reducer;

It should be noted that, in this embodiment, the longitudinal length of the L-shaped socket slot two 28 is smaller than the longitudinal length of the L-shaped socket slot 7, so that when the driving motor 1 and the planetary gear reducer housing 2 are fixed, the first clamping block 6 moves inward along the L-shaped socket slot 7, when the remaining longitudinal length of the L-shaped socket slot 7 is identical to the L-shaped socket slot two 28, the front end surface of the second clamping block 27 is flush with the front end surface of the L-shaped socket slot two 28, so that when the first clamping block 6 is at the bottom end of the L-shaped socket slot 7, the second clamping block 27 is also at the bottom end of the L-shaped socket slot two 28, thereby realizing synchronous fixation of the driving motor 1 and the planetary gear reducer housing 2 with the output shaft of the driving motor 1 and the connecting shaft 25 of the transmission gear one 16.

The use process of the planetary gear reducer provided by the utility model is as follows:

When the driving motor 1 is fixed, an operator only needs to slide the clamping blocks I6 on two sides of the fixed disc 5 inwards along the L-shaped inserting groove 7I formed in the planetary gear reducer shell 2, and when the clamping blocks I6 are placed in the bottom of the L-shaped inserting groove 7I, the driving motor 1 is rotated clockwise to enable the clamping blocks I6 to move towards the clamping groove I8 along the L-shaped inserting groove 7, the arc-shaped blocks I14 are extruded, the arc-shaped blocks I14 push the L-shaped clamping plates I13 to shrink inwards and gradually separate from the front end face of the pushing plate I10, at the moment, the pushing plate I10 drives the clamping blocks I6 to move towards the outer side of the clamping groove I8 under the action of the compression spring I9 until the top ends of the clamping blocks I6 are attached to the clamping groove I8, and simultaneously the driving motor 1 is fixed with the planetary gear reducer shell 2, the clamping blocks II 27 on two sides of an output shaft of the driving motor 1 synchronously move with the clamping blocks I6 on two sides of the fixed disc 5 in the shaft sleeve 26, and accordingly the driving motor 1 and the planetary gear reducer shell 2 are synchronously connected with the output shaft 25 of the driving motor 1 and the transmission gear I16.

The preferred embodiments of the utility model disclosed above are intended only to assist in the explanation of the utility model. The preferred embodiments are not intended to be exhaustive or to limit the utility model to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best understand and utilize the utility model. The utility model is limited only by the claims and the full scope and equivalents thereof.

Claims (6)

1. The utility model provides a planetary gear reducer, includes driving motor (1), planetary gear reducer shell (2), first planetary gear set (3) and second planetary gear set (4), its characterized in that, driving motor (1) is fixed to be located one side of planetary gear reducer shell (2), the front end of driving motor (1) has set firmly fixed disk (5), the output shaft of driving motor (1) runs through fixed disk (5) looks joint with first planetary gear set (3), the both sides of fixed disk (5) are equipped with fixture block one (6), the inside of planetary gear reducer shell (2) is equipped with fixed subassembly one fixed to fixed disk (5).

2. The planetary gear reducer according to claim 1, wherein the fixing component I comprises a plurality of L-shaped inserting grooves I (7) designed in the planetary gear reducer casing (2), the end parts of the L-shaped inserting grooves I (7) are communicated with clamping grooves I (8), one end, close to the inner side, of each clamping groove I (8) is fixedly provided with a compression spring I (9), the other end of each compression spring I (9) is fixedly provided with a push plate I (10), one side of each clamping groove I (8) is fixedly provided with a limiting block I (11) matched with the side surface of each push plate I (10), and the outer end surfaces of the push plates I (10) and the limiting blocks I (11) are flush with the inner side walls of the L-shaped inserting grooves I (7);

The planetary gear reducer is characterized in that a plurality of first mounting grooves communicated with the first clamping grooves (8) are formed in the planetary gear reducer casing (2), the first mounting grooves are away from one side of the first push plate (10) and fixedly provided with second compression springs (12), the other ends of the second compression springs (12) are fixedly provided with first L-shaped clamping plates (13) which are clamped with the first push plate (10), and the first L-shaped clamping plates (13) are fixedly provided with first arc-shaped blocks (14) matched with the first clamping blocks (6).

3. The planetary gear reducer according to claim 1, wherein the first planetary gear set (3) comprises a plurality of first gears (15) with annular design, a plurality of first gears (15) are meshed with a first transmission gear (16) around a circle center formed, a first transmission shaft (17) is fixedly arranged in the middle of each first gear (15), a first planetary gear carrier (18) is fixedly arranged at the other end of each first transmission shaft (17), a second transmission gear (19) is fixedly arranged in the middle of each first planetary gear carrier (18), and the second transmission gear (19) is arranged in the middle of the second planetary gear set (4).

4. The planetary gear reducer according to claim 3, wherein the second planetary gear set (4) comprises a plurality of gears (20) meshed with the transmission gears (19) and distributed in a ring shape, a transmission shaft (21) is fixedly arranged in the middle of the gears (20), a second planetary gear carrier (22) is fixedly arranged at the other end of the transmission shaft (21), a power output shaft (23) is fixedly arranged in the middle of the second planetary gear carrier (22), and an inner gear ring (24) matched with the first planetary gear set (3) and the second planetary gear set (4) is fixedly arranged in the planetary gear reducer casing (2).

5. A planetary gear reducer according to claim 3, wherein a connecting shaft (25) is fixedly arranged in the middle of the first transmission gear (16), a shaft sleeve (26) is fixedly arranged at the end part of the connecting shaft (25), two clamping blocks (27) are fixedly arranged at two sides of the output shaft of the driving motor (1), and a second fixing component for fixing the output shaft is arranged in the shaft sleeve (26).

6. The planetary gear reducer according to claim 5, wherein the second fixing component comprises a plurality of second L-shaped inserting grooves (28) designed in the shaft sleeve (26), the end parts of the second L-shaped inserting grooves (28) are communicated with second clamping grooves (29), one end, close to the inner side, of the second clamping grooves (29) is fixedly provided with third compression springs (30), the other end of the third compression springs (30) is fixedly provided with second pushing plates (31), one side of the second clamping grooves (29) is fixedly provided with second limiting blocks (32) matched with the side surfaces of the second pushing plates (31), and the outer end surfaces of the second pushing plates (31) and the outer end surfaces of the second limiting blocks (32) are flush with the inner side walls of the second L-shaped inserting grooves (28);

The inside of axle sleeve (26) is equipped with a plurality of mounting grooves II that are linked together with joint groove II (29), the mounting groove II is kept away from one side of push pedal II (31) has set firmly compression spring IV (33), the other end of compression spring IV (33) has set firmly L shape joint board II (34) to push pedal II (31) joint, set firmly on L shape joint board II (34) with fixture block II (27) matched with arc piece II (35).