CN216653266U

CN216653266U - Old cardiovascular disease resumes to temper device

Info

Publication number: CN216653266U
Application number: CN202123016713.1U
Authority: CN
Inventors: 贾丽晔; 冯昊; 周晓丽
Original assignee: Xian Medical University
Current assignee: Xian Medical University
Priority date: 2021-12-03
Filing date: 2021-12-03
Publication date: 2022-06-03
Anticipated expiration: 2031-12-03

Abstract

The utility model provides an old people cardiovascular disease recovery exercise device, which comprises a base; a seat arranged on one side of the upper end of the base; the lower limb exercising assembly comprises an upright post and pedals, wherein the upright post is arranged at the upper end of the base in a sliding manner and is far away from one side of the seat, the pedals are respectively and rotatably arranged at two sides of the upright post, and angle adjusting assemblies for adjusting the angles of the pedals are arranged on the upright post; the upper limb exercising assembly comprises second sliding grooves formed in the upper surfaces of the handrails respectively, two second sliding blocks arranged in the second sliding grooves in a sliding mode, a hand grip and a massaging assembly arranged at the upper ends of the second sliding blocks respectively, driving linkage mechanisms are arranged in the handrails respectively, and the two driving linkage mechanisms are fixedly connected with the pedals through pull ropes respectively. The upper limb massager can exercise the upper limbs and the lower limbs and massage the upper limbs of a patient, has strong functionality, accelerates blood circulation and improves training effect; sit and take exercise on the seat, do simple step on the leg action and can drive and take exercise and massage, intensity is moderate, accords with old patient's health condition, and the patient easily insists on for a long time.

Description

Old cardiovascular disease resumes to temper device

Technical Field

The utility model relates to the technical field of medical instruments, in particular to an exercise device for recovering cardiovascular diseases of old people.

Background

Cardiovascular diseases, also known as circulatory diseases, are a series of diseases related to the circulatory system, which refers to the organs and tissues transporting blood in the human body, mainly including the heart, blood vessels (arteries, veins, microvessels), and can be subdivided into acute and chronic, and are generally related to arteriosclerosis.

Cardiovascular disease mostly takes place in old people, present to the most effective method of cardiovascular disease treat through the operation, but when operation treatment resumes the stage, need cooperate some auxiliary exercise devices of use to carry out certain limbs and take exercise, can make the more fast that the flesh can resume like this, but current old cardiovascular disease limbs exercise device, do not have certain pertinence, intensity is great, make old patient can not persist for a long time, the while is functional also comparatively single, the patient lacks effective exercise, lead to the inside blood circulation of patient's health not smooth, training effect is very poor.

In view of the foregoing, there is a need to design an exercise device for cardiovascular disease recovery in the elderly that overcomes the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to provide an apparatus for cardiovascular recovery exercise in elderly which overcomes the above problems.

In order to achieve the purpose, the utility model adopts the technical scheme that: device is tempered in cardiovascular disease recovery of old age, includes:

a base;

the seat is arranged on one side of the upper end of the base and consists of a seat board, a backrest, a support frame and a left handrail and a right handrail;

the lower limb exercising assembly comprises an upright post which is arranged at the upper end of the base in a sliding manner and is far away from one side of the seat and pedals which are respectively and rotatably arranged at two sides of the upright post, and angle adjusting assemblies for adjusting the angles of the pedals are arranged on the upright post;

the upper limb exercising assembly comprises second sliding grooves which are respectively formed in the upper surfaces of the handrails, two second sliding blocks which are arranged in the second sliding grooves in a sliding mode, a hand grip and a massaging assembly which are respectively arranged at the upper ends of the second sliding blocks, driving linkage mechanisms which are used for promoting the two second sliding blocks to slide are respectively arranged in the handrails, and the two driving linkage mechanisms are respectively fixedly connected with the pedal through pull ropes.

The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.

Furthermore, a first cavity communicated with the second sliding groove is formed in the armrest;

the driving linkage mechanism comprises a first rotating shaft rotatably arranged on the bottom wall of the first cavity, and a winding drum and a first bevel gear which are fixedly arranged on the outer wall of the first rotating shaft in a penetrating manner, the upper end of the first bevel gear is in meshed connection with a second bevel gear, the second bevel gear is fixedly arranged on the smooth outer wall of a screw rod, the screw rod is rotatably arranged between the left side wall and the right side wall of the cavity, two nuts are in threaded connection on the threaded outer wall of the screw rod, and the upper ends of the two nuts are respectively correspondingly connected with the lower ends of the two second sliding blocks;

the inside of reel is equipped with the second cavity, inside the second cavity first pivot outer wall cover is equipped with volute spiral spring, two free ends of volute spiral spring respectively with second cavity inner wall with first pivot outer wall fixed connection, the one end of stay cord is fixed and the winding is in on the reel.

Furthermore, the thread directions on the screw rod are opposite, and internal threads matched with the external threads on the screw rod are arranged on the two nuts.

Furthermore, a limiting block is arranged at the joint of the external threads in the opposite direction on the screw rod.

Further, the massage subassembly includes that the arc upper limbs hold in the palm, establish the arc upper limbs hold in the palm the cushion of inner wall and establish the massage of cushion upper surface is protruding, the both sides that the arc upper limbs held in the palm are equipped with the fixed band respectively, two the fixed band bonds each other.

Further, a first chute has been seted up to one side that the base upper surface was kept away from the seat, the stand slides through first slider and establishes first chute upper end, the upper end of stand is equipped with the receiver.

Furthermore, two ends of the first sliding chute are respectively and fixedly connected with a damping spring.

Furthermore, the angle adjusting assembly comprises a second rotating shaft rotatably arranged in a third cavity of the upright post, a gear penetrating through the outer wall of the second rotating shaft and a tooth block meshed with one side of the gear, and two ends of the second rotating shaft penetrate through the upright post and are fixedly connected with the pedal;

the side, far away from the teeth, of the tooth block is connected to the inner wall of the third cavity through a return spring, a pull rod is arranged at the center of the side, provided with the return spring, of the tooth block, and the pull rod penetrates out of the side wall of the upright column to be connected with a handle.

Furthermore, the two handrails are movably arranged on two sides of the seat board, the lower ends of the handrails are respectively provided with a telescopic supporting rod, and the lower end of the seat board is provided with a telescopic supporting column.

Furthermore, the backrest is rotatably arranged at the rear side of the seat plate, the seat plates at the two sides of the backrest are respectively provided with a fan-shaped block, the surface of each fan-shaped block is uniformly provided with a plurality of positioning holes along the circumference of a concentric circle, the positioning holes are provided with positioning bolts in a penetrating manner, and the two sides of the backrest are respectively provided with threaded holes matched with the positioning bolts.

Compared with the prior art, the utility model has the beneficial effects that:

1. according to the device for recovering and exercising cardiovascular disease of the old people, the lower limb exercising component is arranged on the base on the front side of the seat in a sliding manner, so that a patient can step on the pedal plate by feet to realize lower limb leg kicking exercise; the two handrails are respectively provided with the hand grips and the massage assemblies which slide back and forth, and the driving linkage mechanisms which can promote the hand grips and the massage assemblies to slide back and forth are connected with the pedals through the pull ropes, so that the upper limbs of the patient can be driven to stretch and exercise and massage while the lower limbs of the patient can be exercised, the upper limbs of the patient can be automatically massaged, the function is strong, the blood circulation of the limbs of the patient can be accelerated, and the training effect is improved; meanwhile, the patient sits on the seat to exercise, and can drive to exercise and massage by doing simple leg pedaling action, the exercise intensity is moderate, the body condition of the old patient is met, pertinence is achieved, and the patient can easily insist on the chair for a long time.

2. According to the device for recovering and exercising the cardiovascular disease of the elderly, the scroll spring is arranged in the winding drum and can drive the first rotating shaft to generate certain reciprocating rotation, so that the pull rope can be rewound on the outer wall of the winding drum to return to the original position, a patient can continuously do leg-kicking and leg-retracting actions, and the purpose of leg exercise is achieved; furthermore, the first rotating shaft rotates back and forth and can drive the screw rod to rotate back and forth, so that the stretching exercise and the upper limb massage of the upper limb are realized; simultaneously, the rotary force of volute spiral spring can alleviate patient's strength, simple structure, and the patient is easy to be operated, laborsaving, accords with old patient's demand.

3. According to the device for recovering and exercising the cardiovascular disease of the old people, the pedal plate is rotatably arranged on the stand column, and the angle adjusting assembly is arranged, so that the angle of the pedal plate can be adjusted according to the requirement of a patient, the angle of the pedal plate can better accord with the sitting posture or the height of the patient, the device is more comfortable during exercising, and the effect is better.

4. According to the device for recovering and exercising cardiovascular diseases of the old people, the backrest is rotatably connected to the rear side of the seat plate, the positioning bolt and the positioning hole in the fan-shaped block are used for positioning the angle of the seat plate and the angle of the fan-shaped block, so that a patient can sit, half sit or lie in a position according to requirements during exercising, and the device is high in practicability.

5. According to the cardiovascular disease recovery exercise device for the elderly, the armrests are movably arranged on the two sides of the seat board, the telescopic support rods are arranged at the lower ends of the armrests, and the height of the armrests can be independently adjusted according to exercise and massage requirements; the lower extreme at the bedplate sets up flexible support column, also can adjust the height of bedplate according to patient's height, adjusts in a flexible way, and the practicality is strong.

Drawings

Fig. 1 is a schematic structural diagram of an overall aged cardiovascular disease recovery exercise device provided by the utility model;

FIG. 2 is a side cross-sectional view of an armrest in accordance with an embodiment of the present invention;

FIG. 3 is an enlarged schematic view at A in FIG. 1;

FIG. 4 is an enlarged schematic view at B of FIG. 2;

FIG. 5 is a schematic cross-sectional view of a pillar according to an embodiment of the present invention;

description of reference numerals:

1. a base; 11. a first chute; 12. a first slider; 13. a damping spring;

2. a seat; 21. a seat plate; 22. a backrest; 23. a support frame; 231. a telescopic support rod; 232. a telescopic support column; 24. a handrail; 241. a first cavity; 25. a sector block; 251. positioning holes; 252. positioning the bolt;

3. a lower limb exercise assembly; 31. a column; 311. a third cavity; 32. a foot pedal; 33. a storage box;

4. an upper limb exercise assembly; 41. a second chute; 42. a second slider; 43. a hand grip; 44. a massage assembly; 441. an arc-shaped upper limb support; 442. a soft cushion; 443. massaging the bumps; 444. fixing belts;

5. an angle adjustment assembly; 51. a second rotating shaft; 52. a gear; 53. a tooth block; 54. a return spring; 55. a handle; 56. a pull rod;

6. a drive linkage mechanism; 61. a first rotating shaft; 62. a reel; 621. a second cavity; 63. a first bevel gear; 64. a second bevel gear; 65. a screw rod; 66. a nut; 67. a volute spiral spring; 68. a limiting block;

7. and pulling a rope.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Referring to fig. 1 to 5, an exercise device for recovering cardiovascular disease of the elderly includes:

a base 1;

a seat 2 provided on one side of an upper end of the base 1, the seat 2 including a seat plate 21, a backrest 22, a support frame 23, and two left and right armrests 24;

the lower limb exercising assembly 3 comprises an upright post 31 arranged at one side of the upper end of the base 1 far away from the seat 2 and foot pedals 32 respectively arranged at two sides of the upright post 31 in a rotating way, and the upright post 31 is provided with an angle adjusting assembly 5 for adjusting the angle of the foot pedals 32;

the upper limb exercising assembly 4 comprises second sliding grooves 41 respectively formed in the upper surfaces of the handrails 24, two second sliding blocks 42 arranged in the second sliding grooves 41 in a sliding mode, and a hand grip 43 and a massaging assembly 44 respectively arranged at the upper ends of the second sliding blocks 42, driving linkage mechanisms 6 for promoting the two second sliding blocks 42 to slide are respectively arranged in the handrails 24, and the two driving linkage mechanisms 6 are respectively fixedly connected with the pedal plates 32 through pull ropes 7. The hand grip 43 is arranged at the front side of the massage unit 44, so that the hand grip 43 can be held conveniently for exercise, and the massage unit 44 can massage the arm of the patient.

In the novel chair, when in use, a patient firstly uses the angle adjusting component 5 to adjust the inclination angle of the pedal plate 32 according to the height and sitting posture of the patient, so that the foot can feel more comfortable when stepping on the pedal plate 32; then, two hands respectively hold the hand grips 43, the massage assembly is just positioned under the arms, then two feet respectively step on the pedals 32, so that the upright column 31 slides on the base 1, the pull rope 7 drives the driving linkage mechanism 6 to work, and the driving linkage mechanism 6 drives the two second sliding blocks 42 to slide back and forth along the second sliding grooves 41, thereby realizing the back and forth extension of the arms and the massage of the arms. The utility model can drive the upper limb to do stretching exercise and massage while exercising the lower limb, has strong functionality, can accelerate the blood circulation of the limb of the patient and improve the training effect; meanwhile, the patient sits on the seat 2 to exercise, and can drive exercise and massage by simple leg pedaling, the exercise intensity is moderate, the body condition of the old patient is met, pertinence is achieved, and the patient can easily insist on the chair for a long time.

Preferably, as shown in fig. 2 and 4, a first cavity 241 communicated with the second sliding groove 41 is formed in the armrest 24;

the driving linkage mechanism 6 comprises a first rotating shaft 61 rotatably arranged on the bottom wall of the first cavity 241, and a reel 62 and a first bevel gear 63 fixedly arranged on the outer wall of the first rotating shaft 61 in a penetrating manner, wherein the upper end of the first bevel gear 63 is engaged with a second bevel gear 64, the second bevel gear 64 is fixedly arranged on the smooth outer wall of a screw rod 65, the screw rod 65 is rotatably arranged between the left side wall and the right side wall of the cavity 241, two nuts 66 are connected to the threaded outer wall of the screw rod 65 in a threaded manner, and the upper ends of the two nuts 66 are respectively correspondingly connected with the lower ends of the two second sliding blocks 42; the connecting part of the screw rod 65 and the second bevel gear 64 is a smooth outer wall, and the outer walls of the screw rod and the second bevel gear vertically correspond to the second chute 41 and are threaded outer walls;

the inside of reel 62 is equipped with second cavity 621, inside the second cavity 621 first pivot 61 outer wall cover is equipped with spiral spring 67, two free ends of spiral spring 67 respectively with second cavity 621 inner wall with first pivot 61 outer wall fixed connection, the one end of stay cord 7 is fixed and twines on reel 62.

In this embodiment, the pedal 32 drives the pulling rope 7 to move outward, that is, the pulling rope 7 on the winding drum gradually decreases, in this process, the first rotating shaft 61 rotates the first bevel gear 63, the first bevel gear 63 drives the second bevel gear 64 to rotate, so as to drive the screw rod 65 to rotate, further drive the two second sliding blocks 42 to slide, and finally drive the hand grip 43 and the massage assembly 44 to move forward, thereby realizing upper limb exercise and massage; in the process, the spiral spring 67 generates a certain rotation force until the pull rope 7 is completely pulled out of the armrest 24, the rotation force is maximum, and then when the patient moves the pedal plate 32 to one side of the chair 2, the rotation force can drive the upright post 31 to slide backwards through the pull rope 7, so that the patient is more labor-saving; similarly, the rotation force can drive the hand grip 43 and the massage component 44 to move backwards, so as to realize the upper limb exercise and massage; above process is constantly repeated, can realize the recovered purpose of taking exercise of patient, and the rotatory power of volute spiral spring 7 can alleviate patient's strength, simple structure, and the patient easily operates, laborsaving, accords with old patient's demand.

Preferably, the screw thread direction on the lead screw 65 is opposite, two be equipped with on the nut 66 with the internal thread that external screw thread on the lead screw 65 matches, screw thread direction on the lead screw 65 is opposite, enables two second sliders 42 simultaneously and moves or move back to back, and the hand grip 43 and the massage subassembly 44 move in opposite directions or back to back promptly, and this structure is interesting strong, can arouse to a certain extent and temper the enthusiasm, promotes the exercise effect.

Preferably, a limit block 68 is arranged at the junction of the external threads in opposite directions on the screw rod 65, so as to prevent the hand grip 43 and the massage assembly 44 from colliding with each other.

Preferably, the massage assembly 44 includes an arc-shaped upper limb support 441, a cushion 442 disposed on an inner wall of the arc-shaped upper limb support 441, and a massage protrusion 443 disposed on an upper surface of the cushion 442, wherein the massage protrusion 443 is made of a soft material to prevent contusion of the skin of the patient, two fixing straps 444 are respectively disposed on two sides of the arc-shaped upper limb support 441, and the two fixing straps 444 are bonded to each other to facilitate fixing the massage assembly 44 to the upper limb, increase a contact area between the massage protrusion 443 and the limb, and improve a massage effect.

Preferably, base 1 upper surface is kept away from first spout 11 has been seted up to one side of seat 2, stand 31 slides through first slider 12 and establishes in 11 upper ends of first spout, the upper end of stand 31 is equipped with receiver 33, and receiver 33 can prevent some patients 'personal article, and article drop or put on one's body uncomfortable when avoiding taking exercise.

Preferably, the two ends of the first sliding chute 11 are respectively and fixedly connected with a damping spring 13, so as to avoid that the first sliding block 12 generates a large impact force when sliding to the end of the first sliding chute 11, and the patient is frightened or injured.

Preferably, as shown in fig. 5, the angle adjusting assembly 5 includes a second rotating shaft 51 rotatably disposed in the third cavity 311 of the upright column 31, a gear 52 penetrating through an outer wall of the second rotating shaft 51, and a toothed block 53 engaged with one side of the gear 52, wherein two ends of the second rotating shaft 51 penetrate through the upright column 31 and are fixedly connected with the pedal plate 32;

one surface of the tooth block 53, which is far away from the teeth, is connected to the inner wall of the third cavity 311 through a return spring 54, a pull rod 56 is arranged at the center of one surface of the tooth block 53, which is provided with the return spring 54, and the pull rod 56 penetrates through the side wall of the upright column 31 to be connected with a handle 55.

In this embodiment, during adjustment, the handle 55 is pulled outward to drive the pull rod 56 and the side of the tooth block 53 away from the gear 52 to move, so that the teeth are disengaged, then the pedal 32 is rotated to a proper angle, and the handle 55 is released to return to the original position to engage the teeth again, so as to fix the angle.

Preferably, the two handrails 24 are movably arranged at two sides of the seat plate 21, the lower ends of the handrails 24 are respectively provided with a telescopic support rod 231, and the lower end of the seat plate 21 is provided with a telescopic support column 232, so that the heights of the handrails 24 and the seat plate 21 can be conveniently and individually adjusted, and the heights of the handrails 24 can meet the requirements of exercise and massage; the height of the seat plate 21 is made to meet the height requirement of the patient.

Preferably, the backrest 22 is rotatably disposed at the rear side of the seat plate 21, the seat plates 21 at two sides of the backrest 22 are respectively provided with a sector 25, the surface of the sector 25 is uniformly provided with a plurality of positioning holes 251 along the circumference of the concentric circle thereof, the positioning holes 251 are provided with positioning bolts 252 in a penetrating manner, and two sides of the backrest 22 are respectively provided with threaded holes matched with the positioning bolts 252.

Preferably, the upper end of the foot pedal 32 may be provided with a foot cover or a fixing band to prevent the foot of the patient from sliding off the foot pedal 32.

The present invention has been further described with reference to the examples, but the present invention is not limited to the above-described embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims

1. An apparatus for recovering and exercising cardiovascular disease of old people, which is characterized in that it comprises:

a base (1);

the seat (2) is arranged on one side of the upper end of the base (1), and the seat (2) consists of a seat plate (21), a backrest (22), a support frame (23) and a left armrest and a right armrest (24);

the lower limb exercising assembly (3) comprises an upright post (31) which is arranged at one side of the upper end of the base (1) far away from the seat (2) in a sliding manner and foot pedals (32) which are respectively arranged at two sides of the upright post (31) in a rotating manner, and an angle adjusting assembly (5) for adjusting the angle of the foot pedals (32) is arranged on the upright post (31);

the upper limb exercising assembly (4) comprises second sliding grooves (41) respectively formed in the upper surfaces of the handrails (24), two second sliding blocks (42) arranged in the second sliding grooves (41) in a sliding mode, a hand grip (43) and a massaging assembly (44) respectively arranged at the upper ends of the second sliding blocks (42), driving linkage mechanisms (6) used for enabling the two second sliding blocks (42) to slide are respectively arranged in the handrails (24), and the two driving linkage mechanisms (6) are respectively fixedly connected with the pedal plates (32) through pull ropes (7).

2. The cardiovascular disease recovery exercise device for elderly according to claim 1, wherein:

a first cavity (241) communicated with the second sliding groove (41) is formed in the armrest (24);

the driving linkage mechanism (6) comprises a first rotating shaft (61) rotatably arranged on the bottom wall of the first cavity (241), a winding drum (62) and a first bevel gear (63) which are fixedly arranged on the outer wall of the first rotating shaft (61) in a penetrating mode, the upper end of the first bevel gear (63) is connected with a second bevel gear (64) in a meshing mode, the second bevel gear (64) is fixedly arranged on the smooth outer wall of a screw rod (65), the screw rod (65) is rotatably arranged between the left side wall and the right side wall of the cavity (241), two nuts (66) are in threaded connection on the threaded outer wall of the screw rod (65), and the upper ends of the two nuts (66) are respectively in corresponding connection with the lower ends of the two second sliding blocks (42);

the inside of reel (62) is equipped with second cavity (621), second cavity (621) inside first pivot (61) outer wall cover is equipped with volute spiral spring (67), two free ends of volute spiral spring (67) respectively with second cavity (621) inner wall with first pivot (61) outer wall fixed connection, the one end of stay cord (7) is fixed and twine on reel (62).

3. The device for recovering cardiovascular disease of elderly according to claim 2, wherein the screw threads on the screw rod (65) are opposite in direction, and the two nuts (66) are provided with internal screw threads matching with the external screw threads on the screw rod (65).

4. The cardiovascular disease recovery exercise device in old age of claim 3, characterized in that, the external screw thread junction that the direction is opposite on the lead screw (65) is equipped with stopper (68).

5. The cardiovascular disease recovery exercise device for old people as claimed in claim 1, wherein the massage assembly (44) comprises an arc-shaped upper limb support (441), a soft cushion (442) arranged on the inner wall of the arc-shaped upper limb support (441), and a massage protrusion (443) arranged on the upper surface of the soft cushion (442), wherein fixing belts (444) are respectively arranged on two sides of the arc-shaped upper limb support (441), and the two fixing belts (444) are adhered to each other.

6. The device for recovering and exercising cardiovascular disease in old people according to claim 1, wherein a first sliding groove (11) is formed in one side, away from the seat (2), of the upper surface of the base (1), the upright column (31) is slidably arranged at the upper end of the first sliding groove (11) through a first sliding block (12), and a storage box (33) is arranged at the upper end of the upright column (31).

7. The cardiovascular disease recovery exercise device for old people of claim 6, wherein the two ends of the first sliding chute (11) are fixedly connected with a damping spring (13) respectively.

8. The cardiovascular disease recovery exercise device for elderly according to claim 1, wherein:

the angle adjusting assembly (5) comprises a second rotating shaft (51) rotatably arranged in a third cavity (311) of the upright post (31), a gear (52) penetrating through the outer wall of the second rotating shaft (51) and a tooth block (53) meshed with one side of the gear (52), and two ends of the second rotating shaft (51) penetrate through the upright post (31) and are fixedly connected with the pedal (32);

one face, far away from the teeth, of the tooth block (53) is connected to the inner wall of the third cavity (311) through a return spring (54), the tooth block (53) is provided with a pull rod (56) at the center of one face of the return spring (54), and the pull rod (56) penetrates out of the side wall of the upright column (31) and is connected with a handle (55).

9. The cardiovascular disease recovery exercise device for the elderly as claimed in claim 1, wherein two handrails (24) are movably arranged at two sides of the seat board (21), the lower ends of the handrails (24) are respectively provided with a telescopic support rod (231), and the lower end of the seat board (21) is provided with a telescopic support column (232).

10. The device for recovering and exercising cardiovascular disease in elderly according to claim 9, wherein the backrest (22) is rotatably disposed at the rear side of the seat plate (21), the seat plate (21) at both sides of the backrest (22) is respectively provided with a sector (25), the surface of the sector (25) is uniformly provided with a plurality of positioning holes (251) along the circumference of the concentric circle, the positioning holes (251) are provided with positioning bolts (252), and both sides of the backrest (22) are respectively provided with threaded holes matched with the positioning bolts (252).