CN220756991U - Sitting posture upper limb booster device - Google Patents

Abstract

The utility model discloses a sitting posture upper limb power assisting device, which comprises: the two single-arm units with the same structure and the seat unit are rotationally connected; the seat unit comprises a seat with a universal rotating wheel, and a first connecting piece is arranged at the back of the seat and is used for being rotationally connected with the two single-arm units; the single-arm unit is sequentially composed of a shoulder assembly, an upper arm assembly and a forearm assembly; one end of the shoulder component is rotationally connected with the first connecting piece, and the other end of the shoulder component is rotationally connected with one end of the upper arm component; the other end of the upper arm component is rotationally connected with one end of the small arm component. By adopting the technical scheme of the utility model, the chair seat is added to relieve the lower limb fatigue and the load feeling of the operation worker, so that the working efficiency is further improved.

Description

Sitting posture upper limb booster device

Technical Field

The utility model relates to the field of mechanical auxiliary equipment, in particular to a sitting posture upper limb power assisting device.

Background

The production line production refers to a production organization form for sequentially processing and producing products according to a certain process route and a uniform production speed by continuously passing labor objects through all workplaces, is a further development of object specialized organization forms, and is a production organization form with fine labor division and high production efficiency. In the assembly line workshop, each working place only fixes one or a few working procedures, operators do not need to move, most of the operations are completed only by means of the actions of hands, the working content is simple, the operation repeatability is high, the operators are easy to stress and fatigue, and the production technology level is not improved.

At present, most upper limb boosters are operators in a standing posture adapting state, are worn on the body by the operators, and solve the problem of supporting assistance of the upper limbs, but also have the problems that the weight of the operators is large and the activities are blocked to a certain extent due to the fact that the weight of the operators is large (and part of the upper limb power sources are heavier), so that the upper limb booster is especially not suitable for a scene of production line production.

Disclosure of Invention

The utility model provides a sitting posture upper limb booster device which is used for at least solving the problems that in the prior art, a booster device is heavy in load and inconvenient to move on a production line standing posture worker.

The sitting posture upper limb power assisting device provided by the embodiment of the utility model comprises:

the two single-arm units with the same structure and the seat unit are rotationally connected with each other;

the seat unit comprises a seat with a universal rotating wheel, and a first connecting piece is arranged at the back of the seat and is used for being in rotary connection with the two single-arm units;

the single-arm unit is sequentially composed of a shoulder assembly, an upper arm assembly and a forearm assembly; one end of the shoulder component is rotationally connected with the first connecting piece, and the other end of the shoulder component is rotationally connected with one end of the upper arm component; the other end of the upper arm assembly is rotationally connected with one end of the small arm assembly.

According to some embodiments of the utility model, the first connector comprises:

two support rods and fixing blocks with the same structure;

the fixing block is fixedly arranged on the back of the seat, two through holes are formed in the fixing block, and the axis connecting line direction of the two through holes is perpendicular to the seat surface of the seat;

the two support rods penetrate through the two through holes respectively, one end, away from the shoulder assembly, of each support rod is fixedly connected with the chair back of the chair, a rotating shaft is arranged at one end, close to the shoulder assembly, of each support rod, and a detachable fixing cover is arranged on the rotating shaft.

According to some embodiments of the utility model, the shoulder assembly comprises a first shoulder rotator and a second shoulder rotator rotatably connected by a shoulder rotator;

one end of the first shoulder rotating part is provided with a first through hole, and the first shoulder rotating part is sleeved on the first connecting part through the first through hole, so that the shoulder assembly can rotate in the plane direction parallel to the seat surface of the seat.

A second through hole is formed in one end, far away from the first shoulder rotating piece, of the second shoulder rotating piece, and the opening direction of the second through hole is perpendicular to the opening direction of the first through hole;

the rotating connection parts of the first shoulder rotating piece and the second shoulder rotating piece are respectively provided with a through rotating hole, and an internal gear is arranged in the rotating holes of the second shoulder rotating piece;

the shoulder rotating piece penetrates through the rotating holes of the first shoulder rotating piece and the second shoulder rotating piece and comprises a first unidirectional damping piece, a shoulder rotating shaft, a first shoulder rotating gear, a second shoulder rotating gear and a shoulder top cover; the first shoulder rotating gear and the second shoulder rotating gear are respectively arranged at two ends of the shoulder rotating shaft and are matched with the inner gear, the first unidirectional damping piece penetrates through the first shoulder rotating gear to be connected with the shoulder rotating shaft, and the shoulder top cover penetrates through the second shoulder rotating gear to be connected with the shoulder rotating shaft.

According to some embodiments of the utility model, the first unidirectional damping member comprises:

damping cavity shell, rotating part, movable groove, sealing ring, spring piece and pawl;

the movable groove is arranged in the damping cavity shell, a ratchet-shaped structure is arranged on the inner peripheral wall of the movable groove, a groove is arranged in the center of the movable groove, a protruding portion is arranged at one end of the rotating portion, the spring and the pawl are all arranged around the protruding portion, one end of the spring piece is connected with the rotating portion, the other end of the spring piece is connected with the pawl, and when the protruding portion is embedded in the groove, one end of the pawl is abutted to the ratchet-shaped structure.

According to some embodiments of the utility model, the upper arm assembly comprises:

one end of the upper arm connecting piece is provided with a first protruding part matched with the second through hole, and the first protruding part penetrates through the second through hole;

the first fixing structure is arranged in the middle of the upper arm connecting piece and is used for fixing the upper arm of a human body;

the first locking structure is movably connected with one end of the first protruding part, which is exposed out of the second through hole.

According to some embodiments of the utility model, the forearm assembly includes:

the first small arm rotating piece is rotationally connected with one end of the upper arm assembly through the small arm rotating piece, a third through hole is formed in the first small arm rotating piece, and the third through hole is parallel to the first through hole in direction;

one end of the second forearm rotating piece is provided with a second protruding part matched with the third through hole, and the second protruding part penetrates through the third through hole;

the second fixing structure is arranged in the middle of the second forearm rotating piece and used for fixing the human forearm;

the second locking structure is movably connected with one end of the second protruding part, which is exposed out of the third through hole;

the forearm rotation member includes: the device comprises a second unidirectional damping piece, a small arm rotating shaft, a first small arm rotating gear, a second small arm rotating gear and a small arm top cover; the first small arm rotating gear and the second small arm rotating gear are respectively arranged at two ends of the small arm rotating shaft, the second unidirectional damping piece penetrates through the first small arm rotating gear to be connected with the small arm rotating shaft, and the small arm top cover penetrates through the second small arm rotating gear to be connected with the small arm rotating shaft.

According to some embodiments of the utility model, the sitting posture upper limb assistance device further comprises:

one end of the first power assisting device is connected with the shoulder assembly, and the other end of the first power assisting device is connected with the upper arm assembly;

and one end of the second power assisting device is connected with the upper arm assembly, and the other end of the second power assisting device is connected with the small arm assembly.

According to some embodiments of the utility model, the first and second booster devices are random gas-off springs.

By adopting the embodiment of the utility model, the rotation change of the angles of all parts in the booster is realized by arranging the sitting posture upper limb booster device with multi-structure cooperation, so that the chair seat is increased to reduce the fatigue and the load feeling of the lower limb of the operator while the upper limb booster support is provided for the operator, and the working efficiency is further improved.

The foregoing description is only an overview of the present utility model, and is intended to be implemented in accordance with the teachings of the present utility model in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present utility model more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. In the drawings:

FIG. 1 is a schematic diagram of a seated upper limb assist device in accordance with an embodiment of the present utility model;

FIG. 2 is a schematic view of a shoulder assembly, an upper arm assembly and a forearm assembly according to an embodiment of the utility model;

FIG. 3 is a schematic view of a first connector according to an embodiment of the present utility model;

FIG. 4 is a schematic view of the shoulder assembly, upper arm assembly and forearm assembly according to an embodiment of the utility model;

FIG. 5 is a schematic view of the shoulder assembly, upper arm assembly and forearm assembly according to an embodiment of the utility model;

FIG. 6 is a schematic view of a shoulder rotator according to an embodiment of the present utility model;

FIG. 7 is a schematic view of a first unidirectional damping member in accordance with an embodiment of the present utility model;

FIG. 8 is a schematic longitudinal cross-sectional view of a first unidirectional damping member in an embodiment of the present utility model;

FIG. 9 is a schematic cross-sectional view of a first unidirectional damping member in accordance with an embodiment of the present utility model.

Detailed Description

Exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

The utility model provides a sitting posture upper limb booster device, which comprises:

the two single-arm units with the same structure and the seat unit are connected with each other in a rotating way.

The seat unit comprises a seat with a universal rotating wheel, and a first connecting piece is arranged on the back of the seat and is used for being connected with the two single-arm units in a rotating mode.

The single-arm unit is composed of a shoulder assembly, an upper arm assembly and a forearm assembly in sequence. One end of the shoulder component is rotationally connected with the first connecting piece, the shoulder component rotates by taking one end of the first connecting piece as the center, and the plane where the rotation direction is located is parallel to the seat surface of the seat, so that the inward folding and outward unfolding actions of the shoulder joint are realized. The other end of the shoulder component is rotationally connected with one end of the upper arm component so as to realize the abduction and adduction actions of the upper arm in the vertical direction. The other end of the upper arm assembly is rotationally connected with one end of the forearm assembly so as to realize the bending and stretching actions of the elbow joint.

By adopting the embodiment of the utility model, the rotation change of the angles of all joint parts of the upper limbs in the booster is realized by arranging the multi-structure cooperative sitting posture upper limb booster such as the shoulder, the upper arm, the forearm and the like, so that the chair seat is increased to relieve the fatigue and the load feeling of the lower limbs of the operator while the upper limb booster support is provided for the operator, and the co-sitting efficiency is further improved.

On the basis of the above-described embodiments, various modified embodiments are further proposed, and it is to be noted here that only the differences from the above-described embodiments are described in the various modified embodiments for the sake of brevity of description.

According to some embodiments of the utility model, the first connector comprises:

two supporting rods with the same structure and a fixed block.

The fixed block is fixedly arranged at the back of the seat, two through holes are formed in the fixed block, and the axis connecting line direction of the two through holes is perpendicular to the seat surface of the seat.

The two support rods penetrate through the two through holes respectively, one end, away from the shoulder assembly, of each support rod is fixedly connected with the chair back of the chair, a rotating shaft is arranged at one end, close to the shoulder assembly, of each support rod, and a detachable fixing cover is arranged on the rotating shaft. The shoulder assembly can be sleeved on the rotating shaft of the supporting rod, and the fixed cover is used for limiting and fixing the shoulder assembly so as to prevent the shoulder assembly from falling off the supporting rod and limit the height of the rotating plane of the shoulder assembly.

According to some embodiments of the utility model, the shoulder assembly includes a first shoulder rotator and a second shoulder rotator rotatably coupled by a shoulder rotator.

One end of the first shoulder rotating part is provided with a first through hole, and the first shoulder rotating part is sleeved on the first connecting part through the first through hole, so that the shoulder assembly can rotate in the plane direction parallel to the seat surface of the seat.

The second shoulder rotating piece is far away from one end of the first shoulder rotating piece and is provided with a second through hole, and the opening direction of the second through hole is perpendicular to the opening direction of the first through hole.

The rotating connection parts of the first shoulder rotating piece and the second shoulder rotating piece are respectively provided with a through rotating hole, and an internal gear is arranged in the rotating holes of the second shoulder rotating piece.

The shoulder rotating piece penetrates through the rotating holes of the first shoulder rotating piece and the second shoulder rotating piece, and the shoulder rotating piece comprises a first unidirectional damping piece, a shoulder rotating shaft, a first shoulder rotating gear, a second shoulder rotating gear and a shoulder top cover. The first shoulder rotating gear and the second shoulder rotating gear are respectively arranged at two ends of the shoulder rotating shaft and are matched with the inner gear, the first unidirectional damping piece penetrates through the first shoulder rotating gear to be connected with the shoulder rotating shaft, and the shoulder top cover penetrates through the second shoulder rotating gear to be connected with the shoulder rotating shaft. The lifting action of the arm can be realized through the rotation of the first shoulder rotating piece and the second shoulder rotating piece.

According to some embodiments of the utility model, the first unidirectional damping member comprises:

damping cavity shell, rotating part, movable groove, sealing ring, spring piece and pawl;

the movable groove is arranged in the damping cavity shell, a ratchet-shaped structure is arranged on the inner peripheral wall of the movable groove, a groove is arranged in the center of the movable groove, a protruding portion is arranged at one end of the rotating portion, the spring and the pawl are all arranged around the protruding portion, one end of the spring piece is connected with the rotating portion, the other end of the spring piece is connected with the pawl, and when the protruding portion is embedded in the groove, one end of the pawl is abutted to the ratchet-shaped structure.

According to some embodiments of the utility model, the upper arm assembly comprises:

the upper arm connecting piece, one end is provided with the first protruding portion of second through-hole adaptation, first protruding portion wears to locate the second through-hole. The upper arm connecting piece can rotate around the second through hole so as to realize the abduction and adduction actions of the arm.

The first fixing structure is arranged in the middle of the upper arm connecting piece and used for fixing the upper arm of a human body. For example, the first fastening structure may be a velcro.

The first locking structure is movably connected with one end of the first protruding part, which is exposed out of the second through hole. For example, an external thread is provided at one end of the first protruding portion, an internal thread adapted to the external thread is provided on the first locking structure, and when the first protruding portion penetrates through the second through hole, the first locking mechanism is screwed on one end of the first protruding portion exposed out of the second through hole, so that limiting of the upper arm connecting piece is achieved.

According to some embodiments of the utility model, the forearm assembly includes:

the first forearm rotating piece is rotationally connected with one end of the upper arm assembly through the forearm rotating piece, a third through hole is formed in the first forearm rotating piece, and the third through hole is parallel to the direction of the first through hole.

And one end of the second forearm rotating piece is provided with a second protruding part matched with the third through hole, and the second protruding part penetrates through the third through hole. The second small arm rotating piece rotates around the third through hole, so that the abduction and adduction actions of the small arm are realized.

The second fixing structure is arranged in the middle of the second forearm rotating piece and used for fixing the human forearm. For example, the second fastening structure may be a velcro.

And the second locking structure is movably connected with one end of the second protruding part, which is exposed out of the third through hole. For example, an external thread is provided at one end of the second protruding portion, an internal thread adapted to the external thread is provided on the second locking structure, and when the second protruding portion passes through the third through hole, the second locking mechanism is screwed on one end of the second protruding portion exposed out of the third through hole, so as to limit the second forearm rotating member.

The forearm rotation member includes: the device comprises a second unidirectional damping piece, a small arm rotating shaft, a first small arm rotating gear, a second small arm rotating gear and a small arm top cover; the first small arm rotating gear and the second small arm rotating gear are respectively arranged at two ends of the small arm rotating shaft, the second unidirectional damping piece penetrates through the first small arm rotating gear to be connected with the small arm rotating shaft, and the small arm top cover penetrates through the second small arm rotating gear to be connected with the small arm rotating shaft.

According to some embodiments of the utility model, the sitting posture upper limb assistance device further comprises:

and one end of the first power assisting device is connected with the shoulder assembly, and the other end of the first power assisting device is connected with the upper arm assembly.

And one end of the second power assisting device is connected with the upper arm assembly, and the other end of the second power assisting device is connected with the small arm assembly.

According to some embodiments of the utility model, the first and second booster devices are random gas-off springs.

The sitting position upper limb assistance device is described in detail below with a specific example. It is to be understood that the following description is exemplary only and is not intended to limit the utility model in any way. All similar structures and similar variations of the utility model are included in the scope of the utility model.

In this embodiment, referring to fig. 1, the sitting posture upper limb assistance device includes:

a seat 7. A first connector 4 arranged on the back of the seat 7. A shoulder assembly 1 rotatably connected to the first link 4, an upper arm assembly 2 rotatably connected to the shoulder assembly 1, and a forearm assembly 3 rotatably connected to the upper arm assembly.

Specifically, referring to fig. 3, the first connecting member 4 includes a fixing block 4-1, and the fixing block 4-1 is disposed at the seat back and has two through holes perpendicular to the seat surface. The two support rods 4-2 are respectively penetrated and provided with a through hole, one end of each support rod is fixedly connected with the chair back, the height of the other end of each support rod exceeds the highest end of the chair surface, and a rotating shaft and a first limiting cover 4-3 are arranged.

Referring to fig. 2, one end of the first shoulder rotating member 1-1 is provided with a first through hole adapted to the rotating shaft, the first through hole is sleeved on the rotating shaft at the other end of the supporting rod 4-2, and the limiting cover 4-3 is screwed on the rotating shaft. The second shoulder rotating piece 1-2 is connected with the first shoulder rotating piece 1-1 in a rotating way, so that the lifting and falling actions of the arm can be realized. One end of the second shoulder rotator 1-2 is provided with a second through hole.

Referring to fig. 2, the upper arm link 2-1 is rotatably connected with the second shoulder rotator 1-2. The upper arm connecting piece 2-1 is also provided with a magic tape 2-2. Referring to fig. 4, one end of the upper arm connector 2-1 is further provided with a protruding portion, the protruding portion penetrates through the second through hole, and the upper arm connector 2-1 is limited and fixed by the second limiting cover 2-3.

Referring to fig. 2, the forearm assembly 3 includes a first forearm rotator 3-1 and a second forearm rotator 3-2. The first forearm rotating member 3-1 is rotatably connected with the upper arm connecting member 2-1. The first small arm rotating piece 3-1 is provided with a third through hole, the second small arm rotating piece 3-2 is provided with a protruding part, the protruding part penetrates through the third through hole, and the third limiting cover 3-9 is used for limiting and fixing the second small arm rotating piece 3-2.

Referring to fig. 1, an optional air stop spring 5 is provided at a side position of the first shoulder rotating member 1-1 and the upper arm connecting member 2-1, one end of the optional air stop spring 5 is fixedly connected with the first shoulder rotating member 1-1, and the other end is fixedly connected with the upper arm connecting member 2-1. An optional air stopping spring 6 is arranged at the side edge of the upper arm connecting piece 2-1 and the first forearm rotating piece 3-1, one end of the optional air stopping spring 6 is fixedly connected with the upper arm connecting piece 2-1, and the other end of the optional air stopping spring is fixedly connected with the first forearm rotating piece 3-1.

Referring to fig. 4-5, the first shoulder turning member 1-1 and the second shoulder turning member 1-2, and the forearm turning member 3-1 and the second forearm turning member 3-2 are connected by turning members having the same structure. Here, the rotation structure of the rotation member between the first shoulder rotation member 1-1 and the second shoulder rotation member 1-2 will be described in detail by taking the rotation member as an example.

Referring to fig. 6, the rotating member includes a first unidirectional damping member 1-3, a shoulder rotating shaft 1-5, a first shoulder rotating gear 1-6, a second shoulder rotating gear 1-7, and a shoulder top cover 1-4. The first shoulder rotating gear 1-6 and the second shoulder rotating gear 1-7 are sleeved at two ends of the shoulder rotating shaft 1-5, the first unidirectional damping piece 1-3 is connected with the shoulder rotating shaft 1-5 through the first shoulder rotating gear 1-6, and the shoulder top cover 1-4 is connected with the shoulder rotating shaft 1-5 through the second shoulder rotating gear 1-7. Referring to fig. 4, the rotating member is inserted into the rotating holes provided by the first shoulder rotating member 1-1 and the second shoulder rotating member 1-2, and an internal gear adapted to the first shoulder rotating gear 1-6 and the second shoulder rotating gear 1-7 is provided in the rotating hole of the second shoulder rotating member 1-2. When the rotating members connect the first shoulder rotating member 1-1 and the second shoulder rotating member 1-2, the first shoulder rotating gear 1-6 and the second shoulder rotating gear 1-7 are engaged with the internal gear.

Specifically, referring to fig. 7, the first unidirectional damping member 1-3 includes: damping cavity shell wall 1-3-5, damping cavity shell roof 1-3-1, rotation part 1-3-2, movable groove 1-3-3, sealing washer 1-3-4, spring leaf 1-3-6, pawl 1-3-7. Referring to fig. 8-9, the movable groove 1-3-3 is provided in the damping cavity housing, and damping oil is filled between the damping cavity housing and the movable groove 1-3-3. The inner peripheral wall of the movable groove 1-3-3 is provided with a ratchet-shaped structure, the center of the movable groove 1-3-3 is provided with a groove, one end of the rotary part 1-3-2 is provided with a protruding part, the spring piece 1-3-6 and the pawl 1-3-7 are all arranged around the protruding part, one end of the spring piece 1-3-6 is connected with the rotary part 1-3-2, the other end is connected with the pawl 1-3-7, and when the protruding part is embedded in the groove, one end of the pawl 1-3-7 is abutted with the ratchet-shaped structure. When the rotating part 1-3-2 rotates anticlockwise, namely the parts of the booster device make a pressing action, the spring piece 1-3-6 abuts against the pawl 1-3-7 to be meshed with the ratchet-shaped structure on the inner side of the movable groove 1-3-3, the movable groove 1-3-3 is driven to rotate, and the movable groove 1-3-3 and damping oil generate relative motion to generate damping force. When the rotating part 1-3-2 rotates clockwise, namely the component of the booster makes an upward movement, the pawl 1-3-7 withdraws from the ratchet-shaped structure at the inner side of the movable groove 1-3-3, the pawl 1-3-7 is not in a meshed state with the movable groove 1-3-3, the movable groove 1-3-3 is not driven to rotate, the movable groove 1-3-3 and damping oil do not generate relative movement, and damping force is not generated.

By adopting the embodiment of the utility model, the booster is arranged on the seat, so that the load feeling of a user is reduced. Through shoulder subassembly, upper arm subassembly, forearm subassembly all are provided with the rotation connection of two dimensions, make its each position all can be complete lift down the action of pushing down and abduction adduction, flexible operation, the degree of freedom is high, and the random gas spring of stopping can assist the user to carry out fixed action operation in the critical position, has further improved work efficiency.

It should be noted that the foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, and various modifications and changes may be made to the present utility model by those skilled in the art, and various combinations of the embodiments may be freely combined. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

In the description of the present specification, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

Claims (8)

1. A sitting posture upper limb booster device, comprising:

the two single-arm units with the same structure and the seat unit are rotationally connected with each other;

the seat unit comprises a seat with a universal rotating wheel, and a first connecting piece is arranged at the back of the seat and is used for being in rotary connection with the two single-arm units;

the single-arm unit is sequentially composed of a shoulder assembly, an upper arm assembly and a forearm assembly; one end of the shoulder component is rotationally connected with the first connecting piece, and the other end of the shoulder component is rotationally connected with one end of the upper arm component; the other end of the upper arm assembly is rotationally connected with one end of the small arm assembly.

2. A sitting posture upper limb assistance device as claimed in claim 1, wherein the first connector comprises:

two support rods and fixing blocks with the same structure;

the fixing block is fixedly arranged on the back of the seat, two through holes are formed in the fixing block, and the axis connecting line direction of the two through holes is perpendicular to the seat surface of the seat;

the two support rods penetrate through the two through holes respectively, one end, away from the shoulder assembly, of each support rod is fixedly connected with the chair back of the chair, a rotating shaft is arranged at one end, close to the shoulder assembly, of each support rod, and a detachable fixing cover is arranged on the rotating shaft.

3. A sitting upper limb assist device as claimed in claim 1 wherein the shoulder assembly comprises a first shoulder rotator and a second shoulder rotator rotatably connected by a shoulder rotator;

one end of the first shoulder rotating piece is provided with a first through hole, and the first shoulder rotating piece is sleeved on the first connecting piece through the first through hole so as to realize that the shoulder assembly can rotate in a plane direction parallel to the seat surface of the seat;

a second through hole is formed in one end, far away from the first shoulder rotating piece, of the second shoulder rotating piece, and the opening direction of the second through hole is perpendicular to the opening direction of the first through hole;

the rotating connection parts of the first shoulder rotating piece and the second shoulder rotating piece are respectively provided with a through rotating hole, and an internal gear is arranged in the rotating holes of the second shoulder rotating piece;

the shoulder rotating piece penetrates through the rotating holes of the first shoulder rotating piece and the second shoulder rotating piece and comprises a first unidirectional damping piece, a shoulder rotating shaft, a first shoulder rotating gear, a second shoulder rotating gear and a shoulder top cover; the first shoulder rotating gear and the second shoulder rotating gear are respectively arranged at two ends of the shoulder rotating shaft and are matched with the inner gear, the first unidirectional damping piece penetrates through the first shoulder rotating gear to be connected with the shoulder rotating shaft, and the shoulder top cover penetrates through the second shoulder rotating gear to be connected with the shoulder rotating shaft.

4. A sitting position upper limb assistance device as claimed in claim 3 wherein the first unidirectional damping member comprises:

damping cavity shell, rotating part, movable groove, sealing ring, spring piece and pawl;

the movable groove is arranged in the damping cavity shell, a ratchet-shaped structure is arranged on the inner peripheral wall of the movable groove, a groove is arranged in the center of the movable groove, a protruding portion is arranged at one end of the rotating portion, the spring and the pawl are all arranged around the protruding portion, one end of the spring piece is connected with the rotating portion, the other end of the spring piece is connected with the pawl, and when the protruding portion is embedded in the groove, one end of the pawl is abutted to the ratchet-shaped structure.

5. A sitting upper limb assist device as claimed in claim 3 wherein the upper arm assembly comprises:

one end of the upper arm connecting piece is provided with a first protruding part matched with the second through hole, and the first protruding part penetrates through the second through hole;

the first fixing structure is arranged in the middle of the upper arm connecting piece and is used for fixing the upper arm of a human body;

the first locking structure is movably connected with one end of the first protruding part, which is exposed out of the second through hole.

6. A sitting position upper limb assistance device as claimed in claim 3 wherein the forearm assembly comprises:

the first small arm rotating piece is rotationally connected with one end of the upper arm assembly through the small arm rotating piece, a third through hole is formed in the first small arm rotating piece, and the third through hole is parallel to the first through hole in direction;

one end of the second forearm rotating piece is provided with a second protruding part matched with the third through hole, and the second protruding part penetrates through the third through hole;

the second fixing structure is arranged in the middle of the second forearm rotating piece and used for fixing the human forearm;

the second locking structure is movably connected with one end of the second protruding part, which is exposed out of the third through hole;

the forearm rotation member includes: the device comprises a second unidirectional damping piece, a small arm rotating shaft, a first small arm rotating gear, a second small arm rotating gear and a small arm top cover; the first small arm rotating gear and the second small arm rotating gear are respectively arranged at two ends of the small arm rotating shaft, the second unidirectional damping piece penetrates through the first small arm rotating gear to be connected with the small arm rotating shaft, and the small arm top cover penetrates through the second small arm rotating gear to be connected with the small arm rotating shaft.

7. A sitting upper limb assistance device as claimed in claim 1, further comprising:

one end of the first power assisting device is connected with the shoulder assembly, and the other end of the first power assisting device is connected with the upper arm assembly;

and one end of the second power assisting device is connected with the upper arm assembly, and the other end of the second power assisting device is connected with the small arm assembly.

8. A sitting upper limb assist device as in claim 7 wherein the first assist device and the second assist device are optional gas springs.