CN113599196A

CN113599196A - Rehabilitation training device with lumbar support function for treating sports injury

Info

Publication number: CN113599196A
Application number: CN202111071877.6A
Authority: CN
Inventors: 吕鹏
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-14
Filing date: 2021-09-14
Publication date: 2021-11-05

Abstract

The invention relates to the technical field of rehabilitation training, in particular to a rehabilitation training device with a lumbar support function for treating sports injury, which comprises a training chair body, wherein the training chair body comprises a base, a stabilizing seat is fixedly arranged on the front wall and the rear wall of the bottom surface of the base, a shell is fixedly arranged at the right end of the top surface of the base, a connecting rod is fixedly arranged on the side wall of the top end of the base, a guide rod is fixedly arranged on the side wall of the connecting rod, a sliding block is movably arranged on the guide rod, a seat is fixedly arranged at the top end of the sliding block, a protective shell is fixedly connected to the bottom surface of the seat, and a hand lever is movably arranged on the side wall of the protective shell. The massage chair has the advantages that the massage structure is arranged, so that the lumbar of a patient can be supported during training, the pressure on the lumbar is reduced, the massage cylinder can be driven to massage the lumbar of the patient along with the movement of the handrail of the patient, the local blood circulation is promoted, and the practicability of the training chair body is further improved.

Description

Rehabilitation training device with lumbar support function for treating sports injury

Technical Field

The invention relates to the technical field of rehabilitation training, in particular to a rehabilitation training device with a lumbar support function for treating sports injury.

Background

The ankle joint training chair is used for ankle joint flexion and extension dysfunction training, can allow a patient to carry out active passive training, and when the ankle joint training chair is used, a user needs to sit on the chair, and scratch the handrail with the hand, so that the gear chain drives the pedal to rotate, and the ankle joint flexion and extension dysfunction training is realized.

However, when the ankle joint training chair is used, the user needs to sit on the chair for a long time, but the chair cannot support the lumbar of the user, so that complications such as lumbar disc herniation and the like are easy to occur when the patient trains, the waist pain of the patient can be caused, even the numbness of the two lower limbs occurs, the patient is difficult to perform normal rehabilitation training, and the practicability of the training chair is reduced.

Therefore, in order to solve the above problems, a rehabilitation training device having a lumbar support function for treating sports injuries is proposed.

Disclosure of Invention

The invention aims to provide a rehabilitation training device with a lumbar support function for treating sports injury, which aims to solve the problems that when an ankle joint training chair is used, the chair needs to be seated on the chair for a long time, but the chair cannot support the lumbar of a user, so that when a patient trains, complications such as lumbar disc herniation and the like easily occur, the waist pain of the patient is caused, even the numbness of two lower limbs occurs, the patient is difficult to perform normal rehabilitation training, and the practicability of the training chair is reduced.

In order to achieve the purpose, the invention provides the following technical scheme: a rehabilitation training device with a lumbar support function for treating sports injury comprises a training chair body, wherein the training chair body comprises a base, a stabilizing seat is fixedly mounted on the front wall and the rear wall of the bottom surface of the base, a shell is fixedly mounted at the right end of the top surface of the base, a connecting rod is fixedly mounted on the side wall of the top end of the base, a guide rod is fixedly mounted on the side wall of the connecting rod, a sliding block is movably mounted on the guide rod, a seat is fixedly mounted at the top end of the sliding block, a protective shell is fixedly connected to the bottom surface of the seat, a hand rod is movably mounted on the side wall of the protective shell, a first gear is fixedly connected to the bottom end of the hand rod, a support structure is mounted inside the training chair body and comprises a first bevel gear, a first bevel gear is fixedly mounted at the middle section of the first gear, a rotating cylinder is movably mounted at the left side of the first gear, the front end fixed mounting of a rotatory section of thick bamboo has the second bevel gear, the disc is installed to the front end of second bevel gear, the positive movable mounting of disc has the push rod, the top movable mounting of push rod has the rotary rod, the top fixed mounting of rotary rod has the telescopic link, the inboard movable mounting of telescopic link has a massage section of thick bamboo.

Preferably, the first gear is connected with a first chain, the lower end of the first chain is connected with a second gear, the second gear is connected with a second chain, the right end of the second chain is connected with a third gear, the third gear is connected with a third chain, the upper end of the third chain is connected with a fourth gear, and two ends of the fourth gear are fixedly connected with pedals.

Preferably, the internally mounted of training chair body has auxiliary structure, auxiliary structure includes the guide rail, the inside fixed mounting of base has the guide rail, the inside movable mounting of guide rail has movable post, the top fixedly connected with fifth gear of activity post, the lateral wall fixedly connected with spring of activity post.

Preferably, the support structure is provided with an adjusting structure, the adjusting structure comprises a hand disc, the back wall of the base is movably provided with the hand disc, the front end of the hand disc is movably connected with an ejector rod, and the top end of the ejector rod is fixedly provided with a third bevel gear.

Preferably, the hand wheel is installed to the bottom of slider, the slider passes through the hand wheel to be fixed on the guide arm, the cushion is installed to the top surface of seat, logical groove has been seted up on the seat, and the inside fixed mounting who leads to the groove has the dead lever.

Preferably, the number of the fifth gears is two, the two groups of the fifth gears are both positioned on the inner side of the first chain, the fifth gears are meshed with the first chain, and the top end of the spring is fixedly connected with the inner side wall of the guide rail.

Preferably, the first bevel gear and the second bevel gear are both in a conical structure, the rear end of the rotating cylinder is movably connected with the inner side wall of the base, a movable groove is formed in the rotating cylinder, the diameter of the rear end of the first bevel gear is equal to that of the second bevel gear, the height of the second bevel gear is smaller than that of the first bevel gear, and the second bevel gear is meshed with the rear end of the first bevel gear.

Preferably, a fixing column is fixedly mounted on the edge of the front face of the disc, the bottom end of the push rod is movably connected with the fixing column, and the upper end of the push rod penetrates through the top face of the protective shell.

Preferably, the bottom cover of rotary rod is established on the dead lever, the top surface of seat is exposed on the top of rotary rod, the telescopic link is total two sets of, and is two sets of the telescopic link is located the both sides on rotary rod top respectively, the massage section of thick bamboo is located the centre on two sets of telescopic link tops, be provided with the lug on the massage section of thick bamboo.

Preferably, the front end of the hand disc is located inside the rotating cylinder, the front end of the hand disc is in threaded connection with the movable groove, the ejector rod is located inside the rotating cylinder, the third bevel gear is located between the second bevel gear and the disk, the third bevel gear and the second bevel gear are magnetically attracted, the third bevel gear is fixedly connected with the disk, the third bevel gear is of a conical structure, and the diameter of the third bevel gear is smaller than that of the second bevel gear.

Compared with the prior art, the invention has the beneficial effects that: the training chair can support the lumbar of a patient during training by arranging the massage structure, reduce the pressure on the lumbar, drive the massage cylinder to massage the lumbar of the patient along with the movement of the handrail of the patient, promote local blood circulation and further improve the practicability of the training chair body.

Be provided with a massage section of thick bamboo, be convenient for the patient when sitting on the seat, can support patient's lumbar vertebrae position, alleviate the pressure that the lumbar vertebrae received, reduce the discomfort of patient on the lumbar vertebrae when the training, prolong the training time, guarantee the training effect, be provided with handle bar and first gear, make the patient stimulate the handle bar motion when training, can drive first gear rotatory, make first bevel gear and second bevel gear meshing, drive disc circular motion, let the angle deflection of push rod, it is rotatory around the dead lever to be convenient for the push rod promotes the rotary rod, it can roll at patient's lumbar vertebrae position to make a massage section of thick bamboo, be convenient for massage patient's lumbar vertebrae, promote local blood circulation, increase the functionality of training chair body, further improve the practicality of training chair body.

Be provided with auxiliary structure, the user of being convenient for is at rotatory hand wheel, when adjusting the position of slider on the guide arm, two sets of springs can drive the elasticity of fifth gear to first chain and adjust, guarantee the stability of training chair body, be provided with hand dish and ejector pin, make the rotation of hand dish in the movable slot inside, can drive the ejector pin at the inside horizontal migration of rotary drum, be convenient for promote third bevel gear, let third bevel gear and second bevel gear separation, make third bevel gear and first bevel gear meshing, guarantee that first bevel gear's rotation can drive disc many times circular motion, can accelerate the massage section of thick bamboo at patient's lumbar vertebrae position roll frequency, the effect of massage is improved, the practicality of training chair body has further been improved.

Drawings

FIG. 1 is a front view of the body of the chair of the present invention;

FIG. 2 is a schematic sectional view of a base of the present invention;

FIG. 3 is a schematic top view of the structure of the protective shell of the present invention;

FIG. 4 is a schematic front view of the structure of the guide rail of the present invention;

FIG. 5 is a side view of the massage cylinder of the present invention;

FIG. 6 is a schematic sectional side view of a spin basket according to the present invention;

fig. 7 is a schematic structural side view of the rotating rod of the present invention.

In the figure: 1. a training chair body; 11. a base; 12. a stabilizing base; 13. a housing; 14. a connecting rod; 15. a guide bar; 16. a slider; 17. a seat; 18. a protective shell; 19. a handle; 110. a first gear; 111. a first chain; 112. a second gear; 113. a second chain; 114. a third gear; 115. a third chain; 116. a fourth gear; 117. a foot pedal; 2. a support structure; 21. a first bevel gear; 22. a rotary drum; 23. a second bevel gear; 24. a disc; 25. a push rod; 26. rotating the rod; 27. a telescopic rod; 28. a massage cylinder; 3. an auxiliary structure; 31. a guide rail; 32. a movable post; 33. a fifth gear; 34. a spring; 4. an adjustment structure; 41. a handwheel; 42. a top rod; 43. and a third bevel gear.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-7, an embodiment of the present invention is shown: a rehabilitation training device with a lumbar support function for treating sports injury comprises a training chair body 1, wherein the training chair body 1 comprises a base 11, a stabilizing seat 12 is fixedly installed on the front wall and the rear wall of the bottom surface of the base 11, a shell 13 is fixedly installed at the right end of the top surface of the base 11, a connecting rod 14 is fixedly installed on the side wall of the top end of the base 11, a guide rod 15 is fixedly installed on the side wall of the connecting rod 14, a slide block 16 is movably installed on the guide rod 15, a seat 17 is fixedly installed at the top end of the slide block 16, a protective shell 18 is fixedly connected to the bottom surface of the seat 17, a hand lever 19 is movably installed on the side wall of the protective shell 18, a first gear 110 is fixedly connected to the bottom end of the hand lever 19, a support structure 2 is installed inside the training chair body 1, the support structure 2 comprises a first bevel gear 21, a first bevel gear 21 is fixedly installed at the middle section of the first gear 110, a rotating cylinder 22 is movably installed at the left side of the first gear 110, rotatory section of thick bamboo 22's front end fixed mounting has second bevel gear 23, disc 24 is installed to second bevel gear 23's front end, disc 24's positive movable mounting has push rod 25, the top movable mounting of push rod 25 has rotary rod 26, rotary rod 26's top fixed mounting has telescopic link 27, telescopic link 27's inboard movable mounting has massage tube 28, be convenient for when training, support patient's lumbar vertebrae, reduce the pressure that the lumbar vertebrae received, and can draw the handrail along with the patient, it massages patient's lumbar vertebrae to drive massage tube 28, promote local blood circulation, further improve training chair body 1's practicality.

Furthermore, a first chain 111 is connected to the first gear 110, a second chain 112 is connected to the lower end of the first chain 111, a second chain 113 is connected to the second chain 112, a third gear 114 is connected to the right end of the second chain 113, a third chain 115 is connected to the third gear 114, a fourth gear 116 is connected to the upper end of the third chain 115, and pedals 117 are fixedly connected to the two ends of the fourth gear 116, so that a user can sit on the seat 17 to stroke the hand lever 19 to drive mechanical transmission, and the pedals 117 rotate, thereby realizing ankle joint flexion and extension dysfunction training.

Further, the internally mounted of training chair body 1 has auxiliary structure 3, auxiliary structure 3 includes guide rail 31, the inside fixed mounting of base 11 has guide rail 31, the inside movable mounting of guide rail 31 has movable post 32, the top fixedly connected with fifth gear 33 of movable post 32, the lateral wall fixedly connected with spring 34 of movable post 32, the user of being convenient for is at rotatory hand wheel, when adjusting slider 16 is in the position on guide arm 15, two sets of springs 34 can drive fifth gear 33 and adjust the elasticity of first chain 111, guarantee the stability of training chair body 1.

Further, install on bearing structure 2 and adjust structure 4, it includes hand dish 41 to adjust structure 4, movable mounting has hand dish 41 on the back wall of base 11, the front end swing joint of hand dish 41 has ejector pin 42, the top fixed mounting of ejector pin 42 has third bevel gear 43, make hand dish 41 in the rotation of activity inslot portion, can drive ejector pin 42 in the inside horizontal migration of rotary drum 22, be convenient for promote third bevel gear 43, let third bevel gear 43 and second bevel gear 23 separate, make third bevel gear 43 and first bevel gear 21 mesh, guarantee that the rotation of first bevel gear 21 can drive disc 24 many times circular motion, can accelerate massage drum 28 at patient's lumbar vertebrae position roll frequency, improve the effect of massage, the practicality of training chair body 1 has further been improved.

Furthermore, a hand wheel is installed at the bottom end of the sliding block 16, the sliding block 16 is fixed on the guide rod 15 through the hand wheel, a cushion is installed on the top surface of the seat 17, a through groove is formed in the seat 17, a fixing rod is fixedly installed inside the through groove, the hand wheel is convenient to rotate, the position of the sliding block 16 on the guide rod 15 is adjusted, the distance between the seat 17 and the pedal plate 117 is changed, and the applicability of the training chair body 1 is enlarged.

Furthermore, the fifth gears 33 are two groups, the two groups of fifth gears 33 are located on the inner side of the first chain 111, the fifth gears 33 are meshed with the first chain 111, the top end of the spring 34 is fixedly connected with the inner side wall of the guide rail 31, so that the tightness of the first chain 111 can be adjusted conveniently, the stability of the training chair body 1 is guaranteed, and power is provided for the movement of the movable column 32.

Furthermore, the first bevel gear 21 and the second bevel gear 23 are both conical structures, the rear end of the rotating cylinder 22 is movably connected with the inner side wall of the base 11, a movable groove is formed in the rotating cylinder 22, the diameter of the rear end of the first bevel gear 21 is equal to that of the second bevel gear 23, the height of the second bevel gear 23 is smaller than that of the first bevel gear 21, and the second bevel gear 23 is meshed with the rear end of the first bevel gear 21, so that the rotation of the first bevel gear 21 can drive the second bevel gear 23 to rotate at the same angle, and the rotating cylinder 22 can be ensured to rotate in the base 11.

Furthermore, a fixed column is fixedly installed on the edge of the front face of the disc 24, the bottom end of the push rod 25 is movably connected with the fixed column, and the upper end of the push rod 25 penetrates through the top surface of the protective shell 18, so that when the disc 24 drives the push rod 25 to move, the push rod 25 is pushed and pulled, and the rotation angle of the rotating rod 26 is controlled.

Further, the bottom cover of rotary rod 26 is established on the dead lever, the top of rotary rod 26 exposes the top surface of seat 17, telescopic link 27 is total two sets ofly, two sets of telescopic links 27 are located the both sides on rotary rod 26 top respectively, massage section of thick bamboo 28 is located the centre on two sets of telescopic links 27 tops, be provided with the lug on the massage section of thick bamboo 28, provide the fulcrum for rotary rod 26's motion, make massage section of thick bamboo 28 when the lumbar vertebrae massage to the patient, can stretch out and draw back on telescopic link 27, guarantee the comfort level of massage.

Furthermore, the front end of the hand disc 41 is located inside the rotating cylinder 22, the front end of the hand disc 41 is in threaded connection with the movable groove, the ejector rod 42 is located inside the rotating cylinder 22, the third bevel gear 43 is located between the second bevel gear 23 and the disc 24, the third bevel gear 43 is magnetically attracted with the second bevel gear 23, the third bevel gear 43 is fixedly connected with the disc 24, the third bevel gear 43 is in a tapered structure, the diameter of the third bevel gear 43 is smaller than that of the second bevel gear 23, so that the rotation of the hand disc 41 inside the movable groove can drive the ejector rod 42 to horizontally move inside the rotating cylinder 22, so as to push the third bevel gear 43, and ensure that when the third bevel gear 43 is magnetically attracted with the second bevel gear 23, the rotation of the second bevel gear 23 can drive the disc 24 on the third bevel gear 43 to rotate, and when the third bevel gear 43 is magnetically attracted with the second bevel gear 23, the rotation of the first bevel gear 21 can drive the third bevel gear 43 and the disc 24 to circularly move for multiple times, the rolling frequency of the massage tube 28 at the lumbar vertebra part of the patient is accelerated, the massage effect of the massage tube 28 is improved, and the practicability of the training chair body 1 is further improved.

The working principle is as follows: before the training, rotatable hand wheel, adjust the position of slider 16 on guide arm 15, two sets of springs 34 can drive fifth gear 33 and adjust the elasticity of first chain 111, guarantee that the stability patient of training chair body 1 sits on seat 17 earlier, make the lumbar vertebrae paste tight massage cylinder 28, massage cylinder 28 can support patient's lumbar vertebrae position, alleviate the pressure that the lumbar vertebrae received, reduce the discomfort of patient on the lumbar vertebrae when the training, the extension training time, guarantee the training effect, stroke hand lever 19 after that, hand lever 19 can drive first gear 110 rotatoryly, make the mechanical structure transmission of base 11, it is rotatory to drive running-board 117, the realization is bent to the ankle joint and is stretched the dysfunction training.

Simultaneously, the rotation of the first gear 110 can drive the first bevel gear 21 to rotate, so that the first bevel gear 21 is meshed with the second bevel gear 23 to drive the circular disc 24 to move circularly, the angle of the push rod 25 is deflected, the push rod 25 can push the rotary rod 26 to rotate around the fixed rod, the massage cylinder 28 can roll at the lumbar vertebra of a patient, the lumbar vertebra of the patient can be massaged conveniently, the local blood circulation is promoted, the functionality of the training chair body 1 is improved, and the practicability of the training chair body 1 is further improved.

Then, the hand disc 41 can be rotated to enable the hand disc 41 to rotate in the movable groove to drive the ejector rod 42 to horizontally move in the rotary cylinder 22, so that the third bevel gear 43 is convenient to push, the third bevel gear 43 is separated from the second bevel gear 23, the third bevel gear 43 is meshed with the first bevel gear 21, the rotation of the first bevel gear 21 can drive the disc 24 to circularly move for multiple times, the rolling frequency of the massage cylinder 28 at the lumbar vertebra of the patient is accelerated, the massage effect is improved, and the practicability of the training chair body 1 is further improved.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a recovered branch of academic or vocational study training ware that has lumbar vertebrae support function of treatment sports injury, includes training chair body (1), its characterized in that: the training chair body (1) comprises a base (11), a stabilizing seat (12) is fixedly mounted on the front wall and the rear wall of the bottom surface of the base (11), a shell (13) is fixedly mounted at the right end of the top surface of the base (11), a connecting rod (14) is fixedly mounted on the side wall of the top end of the base (11), a guide rod (15) is fixedly mounted on the side wall of the connecting rod (14), a slider (16) is movably mounted on the guide rod (15), a seat (17) is fixedly mounted at the top end of the slider (16), a protective shell (18) is fixedly connected to the bottom surface of the seat (17), a hand lever (19) is movably mounted on the side wall of the protective shell (18), a first gear (110) is fixedly connected to the bottom end of the hand lever (19), a supporting structure (2) is mounted inside the training chair body (1), and the supporting structure (2) comprises a first bevel gear (21), the utility model discloses a massage chair, including first gear (110), disc (24), the front movable mounting of disc (24) has push rod (25), the top movable mounting of push rod (25) has rotary rod (26), the top fixed mounting of rotary rod (26) has telescopic link (27), the inboard movable mounting of telescopic link (27) has massage section of thick bamboo (28), the left side movable mounting of first gear (110) has rotatory section of thick bamboo (22), the front end fixed mounting of rotatory section of thick bamboo (22) has second bevel gear (23), disc (24) are installed to the front of second bevel gear (23).

2. The rehabilitation training device for treating sports injury with lumbar support function as claimed in claim 1, wherein: the bicycle transmission mechanism is characterized in that a first chain (111) is connected to the first gear (110), a second gear (112) is connected to the lower end of the first chain (111), a second chain (113) is connected to the second gear (112), a third gear (114) is connected to the right end of the second chain (113), a third chain (115) is connected to the third gear (114), a fourth gear (116) is connected to the upper end of the third chain (115), and pedals (117) are fixedly connected to the two ends of the fourth gear (116).

3. The rehabilitation training device for treating sports injury with lumbar support function as claimed in claim 1, wherein: the internally mounted of training chair body (1) has auxiliary structure (3), auxiliary structure (3) include guide rail (31), the inside fixed mounting of base (11) has guide rail (31), the inside movable mounting of guide rail (31) has movable post (32), the top fixedly connected with fifth gear (33) of activity post (32), the lateral wall fixedly connected with spring (34) of activity post (32).

4. The rehabilitation training device for treating sports injury with lumbar support function as claimed in claim 1, wherein: install on bearing structure (2) and adjust structure (4), it includes hand dish (41) to adjust structure (4), movable mounting has hand dish (41) on the back wall of base (11), the front end swing joint of hand dish (41) has ejector pin (42), the top fixed mounting of ejector pin (42) has third bevel gear (43).

5. The rehabilitation training device for treating sports injury with lumbar support function as claimed in claim 1, wherein: the hand wheel is installed to the bottom of slider (16), slider (16) are fixed on guide arm (15) through the hand wheel, the cushion is installed to the top surface of seat (17), logical groove has been seted up on seat (17), and the inside fixed mounting who leads to the groove has the dead lever.

6. The rehabilitation training device with lumbar support function for treating sports injury as claimed in claim 3, wherein: the number of the fifth gears (33) is two, the two groups of the fifth gears (33) are located on the inner side of the first chain (111), the fifth gears (33) are meshed with the first chain (111), and the top end of the spring (34) is fixedly connected with the inner side wall of the guide rail (31).

7. The rehabilitation training device for treating sports injury with lumbar support function as claimed in claim 1, wherein: the first bevel gear (21) and the second bevel gear (23) are both conical structures, the rear end of the rotating cylinder (22) is movably connected with the inner side wall of the base (11), a movable groove is formed in the rotating cylinder (22), the diameter of the rear end of the first bevel gear (21) is equal to that of the second bevel gear (23), the height of the second bevel gear (23) is smaller than that of the first bevel gear (21), and the second bevel gear (23) is meshed with the rear end of the first bevel gear (21).

8. The rehabilitation training device for treating sports injury with lumbar support function as claimed in claim 2, wherein: the edge of the front face of the disc (24) is fixedly provided with a fixing column, the bottom end of the push rod (25) is movably connected with the fixing column, and the upper end of the push rod (25) penetrates through the top face of the protective shell (18).

9. The rehabilitation training device for treating sports injury with lumbar support function as claimed in claim 1, wherein: the bottom cover of rotary rod (26) is established on the dead lever, the top of rotary rod (26) exposes the top surface of seat (17), telescopic link (27) are total two sets of, two sets of telescopic link (27) are located the both sides on rotary rod (26) top respectively, a massage section of thick bamboo (28) are located the centre on two sets of telescopic link (27) tops, be provided with the lug on a massage section of thick bamboo (28).

10. The rehabilitation training device with lumbar support function for treating sports injury as claimed in claim 4, wherein: the front end of the hand disc (41) is located inside the rotating cylinder (22), the front end of the hand disc (41) is in threaded connection with the movable groove, the ejector rod (42) is located inside the rotating cylinder (22), the third bevel gear (43) is located between the second bevel gear (23) and the disc (24), the third bevel gear (43) and the second bevel gear (23) are magnetically attracted, the third bevel gear (43) is fixedly connected with the disc (24), the third bevel gear (43) is of a conical structure, and the diameter of the third bevel gear (43) is smaller than that of the second bevel gear (23).