CN212369191U - Backplate device and wheelchair - Google Patents

Abstract

The utility model relates to a wheelchair, in particular to a backboard device, which comprises a slide rail group, a supporting component and a folding expansion component, wherein the slide rail group comprises a first slide rail and a second slide rail which are oppositely arranged; the support assembly comprises two support connecting rods and a support piece, the two support connecting rods are respectively connected with the first sliding rail and the second sliding rail, and the support piece is used for supporting the backboard when the backboard is placed flat; the folding expansion assembly comprises a folding connecting rod and an expansion pushing rod, one end of the folding connecting rod is fixedly connected with the expansion pushing rod, and the other end of the folding connecting rod is movably connected with the support piece; one end of the first telescopic component is movably connected with the back plate, and the other end of the first telescopic component is movably connected with a frame of the wheelchair. The utility model discloses can realize that the wheelchair is automatic extends, lie and folding function.

Description

Backplate device and wheelchair

Technical Field

The utility model relates to a wheelchair field, concretely relates to can realize that wheelchair backplate extends, lie flat and folding wheelchair.

Background

By 2019, the aged population above 60 years old in China already reaches about 2.5 hundred million people, accounting for about 18 percent of the total population, wherein the aged population above 65 years old reaches 1.67 hundred million and accounts for about 11.9 percent of the total population, and the disabled or semi-disabled people reach 0.85 hundred million and account for about 6 percent of the total population; it is seen that the demand of the elderly population, the incapacitated population and the semi-incapacitated population with a large number of people in China for the wheelchair is increasing day by day.

The wheelchair is an important life and medical auxiliary tool for people with limb disabilities, old people and temporary sexual dysfunction. However, wheelchair users who cannot take care of themselves need to sit on the wheelchair to move, lie on the wheelchair with the flat back plate to rest, or cause secondary injury to the users when the users are transferred from the wheelchair to other equipment, and the nursing workload is increased.

At present, most wheelchairs mainly comprise leg plates, seat plates, back plates and frames, the back plates of common wheelchairs can have a certain dumping angle, however, due to the fact that the back plates are not supported enough at the rear, complete lying is difficult to achieve, the width of the back plates of the common wheelchairs is narrow, a user can not turn over when lying on the wheelchairs with the flat back plates, the comfort level is poor, and the width of the back plates of the wheelchairs needs to be widened.

At present, a support device is additionally arranged at the rear part of a frame body of a frame in the conventional common support back plate method, but the method is inconvenient to install and occupies a large space, so that the overall length of the wheelchair is too long, and the maneuverability is poor; the transmission of the rear supporting device is controlled by adding the conveying track, however, the method needs to additionally add a driving element, and is inconvenient to install and expensive.

The existing common back plate widening method directly widens the width of the back plate, so that the whole wheelchair is wide, heavy and inconvenient to move; the width of the back plate is increased through a manual butt joint expansion part, but the method is inaccurate in butt joint, easy to damage, large in workload, impractical and difficult to realize automation.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve among the prior art support backplate method and adopt to increase the transmission of transfer rail control rear strutting arrangement and need increase former driving link, cause the inconvenient, the expensive problem of installation, provide a backplate folding, extend the device, can realize automatically that the wheelchair backplate extends, lies and fold.

The utility model adopts the technical proposal that:

a backplane apparatus, comprising:

the back plate comprises a first plate, a second plate and a third plate which are hinged in sequence;

the sliding rail set comprises a first sliding rail and a second sliding rail, the first sliding rail and the second sliding rail are arranged oppositely, and the first sliding rail and the second sliding rail respectively comprise a movable rail and a fixed rail which are connected with each other;

the support assembly supports the back plate and comprises two support connecting rods and a support piece vertically connected with the two support connecting rods, and the two support connecting rods are respectively connected with a fixed rail of the first sliding rail and a fixed rail of the second sliding rail;

the folding expansion assembly comprises a folding connecting rod and an expansion pushing rod, one end of the folding connecting rod is fixedly connected with the expansion pushing rod, and the other end of the folding connecting rod is movably connected with the support piece;

the one end swing joint of first flexible subassembly the second board of backplate, the other end swing joint framework of first flexible subassembly.

Furthermore, metal connecting sheets are arranged on the movable rail of the first sliding rail and the movable rail of the second sliding rail, and a bottom cross beam of the frame body is fixedly connected with the metal connecting sheets.

Furthermore, a back plate connecting block is arranged on the second plate and movably connected with the expansion pushing rod.

The utility model discloses a solve among the prior art support backplate method and adopt to increase the transmission of transfer rail control rear strutting arrangement and need increase former driving link, cause the inconvenient, the expensive problem of installation, provide a wheelchair, use foretell backplate device, can realize automatically that the wheelchair backplate extends, lies and folds.

A wheelchair comprising a back plate arrangement and further comprising a seat plate arrangement, the seat plate arrangement comprising:

the seat plate comprises a fourth plate, a fifth plate and a sixth plate which are hinged in sequence;

a ground supporting assembly respectively connecting the fourth plate and the sixth plate;

one end of the second telescopic assembly is connected with the fifth plate of the seat plate, and the other end of the second telescopic assembly is connected with the ground supporting assembly.

Further, still be provided with the backup pad below the wheelchair bedplate, the backup pad size is greater than the bedplate size, works as the fourth board with the sixth board is set level, the backup pad supports the fourth board with the sixth board.

Furthermore, prop ground subassembly includes two at least bracing pieces, two the one end of bracing piece is connected respectively the fourth board with the sixth board, two the other end of bracing piece props ground or contradicts the bottom crossbeam of framework.

Furthermore, prop ground subassembly still includes and props ground frame, prop the both ends of ground frame and connect two respectively the bracing piece.

Furthermore, the ground supporting frame is a U-shaped frame or an E-shaped frame, and the height of a ground supporting rod of the ground supporting frame is greater than or equal to the distance from a bottom cross beam of the frame body to the ground.

Furthermore, the other end of the second telescopic assembly is connected with the ground supporting frame.

Further, the wheelchair further comprises a leg plate device, the leg plate device comprises a leg plate and a third telescopic assembly, the leg plate is movably connected with the seat plate, one end of the third telescopic assembly is connected with the leg plate, and the other end of the third telescopic assembly is connected with the top cross beam of the frame body.

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

1. the utility model provides a wheelchair comprising a back plate device and a seat plate device, which is not additionally provided with a driving part through the mechanical structure design, and only depends on a telescopic part used as a folding wheelchair back plate, thereby realizing the folding, expansion and lying multiple automatic functions of the wheelchair back plate, and solving the problems of inconvenient installation and high price caused by the fact that the driving part is required to be added for the folding expansion of the wheelchair back plate in the prior art;

2. the utility model discloses when the wheelchair backplate is flat to lie, realize stretching out the supporting component backward automatically, support the backplate when setting level the backplate to can be great with backplate size design, strengthen backplate bearing capacity simultaneously, solved among the prior art wheelchair change into the too narrow problem of wheelchair bed width, the utility model discloses a backplate size can set up great, simultaneously the utility model discloses a backplate bearing capacity is stronger;

3. the utility model realizes automatic contraction of the supporting component when the back plate of the wheelchair is folded, and can reduce the occupied space;

4. the utility model discloses when the bedplate is put at ordinary times, support it through propping ground subassembly to can be great with bedplate size design, increase the bearing capacity of bedplate simultaneously, solved among the prior art wheelchair and changed into the too narrow problem of wheelchair bed width, the utility model discloses a bedplate size can set up great, simultaneously the utility model discloses a bedplate bearing capacity is stronger.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a back plate according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a backplane apparatus according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a frame body according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a wheelchair back plate device in a folded state according to an embodiment of the present invention;

FIG. 5 is a schematic structural view of a wheelchair backboard device in a flat state according to an embodiment of the present invention;

fig. 6 is a front view of a seat plate device according to an embodiment of the present invention;

fig. 7 is an isometric view of a seat plate apparatus provided in an embodiment of the present invention;

fig. 8 is a schematic structural view of a ground supporting frame according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a limiting block provided in an embodiment of the present invention;

FIG. 10 is a schematic structural view of a wheelchair seat plate device in a folded state according to an embodiment of the present invention;

fig. 11 is a schematic structural view of the wheelchair seat plate device in a flat state according to the embodiment of the present invention;

in the drawings, 1 is a back plate device, 11 is a back plate, 111 is a first plate, 112 is a second plate, 113 is a third plate, 114 is a back plate connecting block, 12 is a slide rail set, 121 is a first slide rail, 122 is a second slide rail, 123 is a metal connecting sheet, 13 is a supporting component, 131 is a supporting connecting rod, 132 is a supporting component, a first transverse support 133, a second transverse support 134, 14 is a folding expanding component, 141 is a folding connecting rod, 142 is an expanding push rod, 15 is a first telescopic component, 2 is a seat plate device, 21 is a seat plate, 211 is a fourth plate, 212 is a fifth plate, 213 is a sixth plate, 22 is a ground supporting component, 221 is a supporting rod, 222 is a ground supporting frame, 223 is a hinged seat, 224 is a limiting block, 23 is a second telescopic component, 3 is a leg plate device, 31 is a leg plate, 32 is a third telescopic component, 4 is a frame body, 41 is a third beam, 42 is a first beam, 43 is a second beam, 44 is a fourth beam, reference numeral 51 denotes a first wheel, 52 denotes a second wheel, and 53 denotes a motor wheel.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Unless specifically stated otherwise, the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and in the case of not making a contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be interpreted as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and if not stated otherwise, the terms have no special meaning, and therefore, the scope of the present invention should not be construed as being limited.

The first embodiment is as follows:

the utility model provides a backplate device 1, this backplate device 1 include backplate 11, slide rail group 12, supporting component 13, folding expansion subassembly 14 and first flexible subassembly 15, and electronic flexible drive backplate 11 through first flexible subassembly 15 is rolled up or is set level, and supporting component 13 supports backplate 11 simultaneously for 11 sizes of backplate can design great.

As a specific embodiment of the back plate 11 provided in this embodiment, as shown in fig. 1, the back plate includes a first plate 111, a second plate 112, and a third plate 113 hinged in sequence, and the lower end of the back plate 11 is movably connected to the seat plate 21, so as to facilitate the back plate 11 to be folded or laid flat.

As a specific embodiment of the slide rail set 12 provided by this embodiment, as shown in fig. 2, the slide rail set 12 includes a first slide rail 121 and a second slide rail 122, the first slide rail 121 and the second slide rail 122 are disposed oppositely, and both the first slide rail 121 and the second slide rail 122 include a movable rail and a fixed rail that are connected to each other.

Specifically, the movable rails of the first slide rail 121 and the second slide rail 122 are both provided with a metal connecting sheet 123, and the bottom beam of the frame 4 is fixedly connected to the metal connecting sheet 123.

Further, as shown in fig. 3, the bottom cross member of the frame body 4 includes a first cross member 42 and a second cross member 43, and the first cross member 42 and the second cross member 43 are fixed to the movable rail of the first slide rail 121 and the movable rail of the second slide rail 122, respectively.

As a specific example of the supporting assembly 13 provided in this embodiment, as shown in fig. 2, the supporting assembly 13 supports the back plate 11, the supporting assembly 13 includes two supporting connecting rods 131 and a supporting member 132 perpendicularly connected to the two supporting connecting rods 131, and the two supporting connecting rods 131 are respectively connected to the fixed rail of the first sliding rail 121 and the fixed rail of the second sliding rail 122.

Specifically, as shown in fig. 2, the supporting member 132 in this embodiment is an "H" shaped frame, a first horizontal support 133 is disposed at the bottom of the "H" shaped frame, two ends of the first horizontal support 133 are respectively connected to two supporting connecting rods 131, a second horizontal support 134 is disposed at the top of the "H" shaped frame, the second horizontal support 134 is longer than the first horizontal support 133, when the backboard 11 is laid flat, the second horizontal support 134 is used for supporting the backboard 11, and the supporting member 132 may be disposed in a plate shape, as long as it can support the backboard 11, which is not limited to this.

As a specific embodiment of the folding expansion assembly 14 provided in this embodiment, as shown in fig. 2, the folding expansion assembly 14 includes a folding connecting rod 141 and an expansion pushing rod 142, one end of the folding connecting rod 141 is fixedly connected to the expansion pushing rod 142, and the other end of the folding connecting rod 141 is movably connected to the support 132.

Specifically, in the present embodiment, the extended push rod 142 is configured as a "U" -shaped rod, the length of the bottom end of the "U" -shaped rod is greater than the width of the second plate 112 of the back plate 11, the two ends of the "U" -shaped rod abut against the first plate 111 and the third plate 113 of the back plate 11, the "U" -shaped rod pushes up the first plate 111 and the third plate 113 to fold up when moving upward, and the first plate 111 and the third plate 113 naturally descend due to gravity when moving downward, thereby being leveled.

Preferably, the second plate 112 of the back plate 11 is provided with a back plate connecting block 114, and the bottom end of the "U" shaped rod is movably connected with the back plate connecting block 114.

As a specific example of the first telescopic assembly 15 provided in this embodiment, one end of the first telescopic assembly 15 is movably connected to the second plate 112 of the back plate 11, and the other end of the first telescopic assembly 15 is movably connected to the frame 4.

Specifically, the first telescopic assembly 15 in this embodiment includes two electric telescopic push rods.

It should be noted that, as shown in fig. 4, when the backboard 11 is laid flat, the first telescopic assembly 15 of the backboard 11 is contracted, the first telescopic assembly 15 of the backboard pulls the second plate 112 of the backboard 11 to be laid flat downward, the second plate 112 of the backboard 11 pushes the folding expansion assembly 14 through the backboard connecting block 114, the folding connecting rod 141 drives the expansion pushing rod 142 to rotate counterclockwise, the first plate 111 and the second plate 112 are turned over outward and laid flat, the folding connecting rod 141 pushes the supporting assembly 13 to extend toward the rear of the frame 4, the supporting assembly 13 drives the sliding rail set 12 to extend, the supporting member 132 of the backboard 11 supports the top of the backboard 11, so that the backboard 11 is laid flat;

when the backboard 11 is folded, the first telescopic assembly 15 extends to push the second board 112 of the backboard 11 to be folded upwards, the folding connecting rod 141 pushes the supporting assembly 13 to contract towards the frame body 4, the supporting assembly 13 contracts towards the frame body 4 to drive the sliding rail set 12 to contract, the backboard connecting block 114 of the backboard 11 drives the expanding push rod 142 to rotate clockwise, and the expanding push rod 142 pushes the first board 111 and the second board 112 when rotating clockwise.

The second implementation:

as shown in fig. 4 and 5, the present embodiment further provides a wheelchair including the back plate device 1, and further including a seat plate device 2 and a leg plate device 3.

As a specific embodiment of the seat board apparatus 2 provided in this embodiment, as shown in fig. 6, the seat board apparatus 2 includes a seat board 21, a ground supporting component 22, and a second telescopic component 23, the second telescopic component 23 extends out to drive the seat board 21 to fold up to form a handrail, the second telescopic component 23 contracts to drive the seat board 21 to lay flat to form a wheelchair bed, and simultaneously the ground supporting component 22 supports the seat board 21, so that the size of the seat board 21 can be set to be larger, and the load-bearing capacity of the seat board 21 is enhanced.

As a specific example of the seat plate 21 provided in the present embodiment, as shown in fig. 7, the seat plate 21 includes a fourth plate 211, a fifth plate 212, and a sixth plate 213 which are hinged in this order.

Further, a support plate 24 is arranged below the wheelchair seat plate 21, the size of the support plate 24 is larger than that of the seat plate 21, and when the fourth plate 211 and the sixth plate 213 are laid flat, the support plate 24 supports the fourth plate 211 and the sixth plate 213.

As a specific example of the hinge assembly 22 provided in this embodiment, the hinge assembly 22 is connected to the fourth plate 211 and the sixth plate 213, respectively.

Specifically, the ground supporting assembly 22 includes at least two supporting rods 221, one end of each of the two supporting rods 221 is connected to the fourth plate 211 and the sixth plate 213, and the other end of each of the two supporting rods 221 supports or abuts against the bottom cross beam of the frame 4.

Preferably, the ground supporting assembly 22 in this embodiment is provided with four supporting rods 221, the four supporting rods 221 are respectively configured as a first supporting rod, a second supporting rod, a third supporting rod and a fourth supporting rod, the first supporting rod and the second supporting rod are connected to the fourth plate 211, the third supporting rod and the fourth supporting rod are connected to the sixth plate 214, when the four supporting rods 221 are forced to move downwards, the fourth plate 211 and the sixth plate 214 are driven to lay flat downwards, and when the four supporting rods 221 are forced to move upwards, the fourth plate 211 and the sixth plate 214 are driven to fold upwards.

Specifically, in the present embodiment, the hinge supports 23 are respectively disposed on the fourth plate 211 and the sixth plate 214, and the upper ends of the four support rods 221 are respectively hinged with the hinge supports 23.

Further, the ground supporting assembly 22 further includes a ground supporting frame 222, and two ends of the ground supporting frame 222 are respectively connected to the two supporting rods 221.

Specifically, the ground supporting frame 222 is configured as a "U" shaped frame or an "E" shaped frame, and the height of the ground supporting rod of the ground supporting frame 222 is greater than or equal to the distance from the bottom cross beam of the frame body 4 to the ground.

Preferably, in this embodiment, the ground supporting frame group 222 includes three "U" shaped frames, the three "U" shaped frames are respectively configured as a first "U" shaped frame, a second "U" shaped frame and a third "U" shaped frame, the first "U" shaped frame and the second "U" shaped frame are arranged oppositely, two ends of the third "U" shaped frame, which are connected to two ends of the third "U" shaped frame respectively, are connected to the first "U" shaped frame and the second "U" shaped frame respectively, two ends of the first "U" shaped frame are connected to the first supporting rod and the third supporting rod respectively, two ends of the second "U" shaped frame are connected to the second supporting rod and the fourth supporting rod respectively, and the ground supporting frame group 221 drives the four supporting rods 221 to move upwards or downwards in this embodiment.

Preferably, as shown in fig. 9 and 10, the first beam 42 and the second beam 43 of the frame body 4 are respectively provided with at least one stopper 224, and when the seat plate 21 is folded, the end of the floor-supporting frame 222 abuts against the stopper 224.

Specifically, as shown in fig. 9, the limiting block 224 is provided with a bottom plate and a vertical plate perpendicular to the bottom plate, the top of the vertical plate is provided with a protruding portion, the bottom plate is fixed on the bottom cross beam of the frame body 4, when the seat plate 21 is folded, the ends of the first "U" shaped frame and the second "U" shaped frame respectively abut against the four limiting blocks 224, and the connecting member at the connection position of the floor supporting frame 222 and the supporting rod 221 is clamped below the protruding portion, so as to achieve positioning.

As a specific example of the second telescopic assembly 23 provided in this embodiment, one end of the second telescopic assembly 23 is connected to the fifth plate 212 of the seat plate 21, and the other end of the second telescopic assembly 23 is connected to the ground supporting assembly 22.

Specifically, the second telescopic assembly 23 includes an electric telescopic rod, one end of the electric telescopic rod is connected to the seat plate 21, and the other end of the electric telescopic rod is connected to the grounding frame 222.

As a specific embodiment of the leg plate device 3 provided in this embodiment, the leg plate device 3 includes a leg plate 31 and a third telescopic assembly 32, the leg plate 31 is movably connected to the seat plate 21, one end of the third telescopic assembly 32 is connected to the leg plate 31, the other end of the third telescopic assembly 32 is connected to the top cross beam of the frame 4, and the leg plate 31 is folded or laid flat by the third telescopic assembly 32.

Further, in the present embodiment, the first universal wheels 51 are disposed at two ends of the bottom of the supporting member 132, the second universal wheel 52 is disposed at the front end of the bottom of the frame 4, and the motor wheel 53 is disposed at the rear end of the bottom of the frame 4.

Further, the first universal wheel 51 is 4 inches in size, the second universal wheel 52 is 8 inches in size, and the motor wheel 53 is 12 inches in size.

In summary, the wheelchair provided by this embodiment can realize that the back plate 11, the seat plate 21 and the leg plate 31 are folded or expanded individually, and can also realize that the back plate 11, the seat plate 21 and the leg plate 31 are folded or expanded simultaneously.

Above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the design of the present invention, equivalent replacement or change should be covered within the protection scope of the present invention.

Claims (10)

1. A backplane apparatus, comprising:

a back plate (11) comprising a first plate (111), a second plate (112) and a third plate (113) hinged in sequence;

the sliding rail set (12), the sliding rail set (12) comprises a first sliding rail (121) and a second sliding rail (122), the first sliding rail (121) and the second sliding rail (122) are arranged oppositely, and the first sliding rail (121) and the second sliding rail (122) both comprise a movable rail and a fixed rail which are connected with each other;

the support assembly (13), the support assembly (13) supports the backboard (11), the support assembly (13) comprises two support connecting rods (131) and a support member (132) vertically connected with the two support connecting rods (131), and the two support connecting rods (131) are respectively connected with a fixed rail of the first slide rail (121) and a fixed rail of the second slide rail (122);

the folding expansion assembly (14) comprises a folding connecting rod (141) and an expansion pushing rod (142), one end of the folding connecting rod (141) is fixedly connected with the expansion pushing rod (142), and the other end of the folding connecting rod (141) is movably connected with the support piece (132);

the back plate comprises a first telescopic assembly (15), one end of the first telescopic assembly (15) is movably connected with a second plate (112) of the back plate (11), and the other end of the first telescopic assembly (15) is movably connected with the frame body (4).

2. A backboard device according to claim 1, wherein the movable rails of the first sliding rail (121) and the second sliding rail (122) are both provided with a metal connecting sheet (123), and the bottom cross beam of the frame body (4) is fixedly connected with the metal connecting sheet (123).

3. Backboard apparatus according to claim 2, wherein a backboard connecting block (114) is arranged on the second board (112), the backboard connecting block (114) is movably connected with the expanding push rod (142).

4. A wheelchair, comprising:

a backpanel apparatus (1) according to any one of claims 1 to 3;

seat pan device (2), the seat pan device (2) comprising:

the seat plate (21), the seat plate (21) comprises a fourth plate (211), a fifth plate (212) and a sixth plate (213) which are hinged in sequence;

a ground-supporting assembly (22), said ground-supporting assembly (22) connecting said fourth plate (211) and said sixth plate (213), respectively;

one end of the second telescopic assembly (23) is connected with the fifth plate (212) of the seat plate (21), and the other end of the second telescopic assembly (23) is connected with the ground supporting assembly (22).

5. Wheelchair according to claim 4, characterized in that a support plate (24) is further arranged below the wheelchair seat plate (21), the support plate (24) having a size larger than the seat plate (21), the support plate (24) supporting the fourth plate (211) and the sixth plate (213) when the fourth plate (211) and the sixth plate (213) are laid flat.

6. Wheelchair according to claim 4, characterised in that the ground bracing assembly (22) comprises at least two support bars (221), one end of the two support bars (221) being connected to the fourth plate (211) and the sixth plate (213), respectively, and the other end of the two support bars (221) being grounded or abutting against a bottom cross member of the frame (4).

7. The wheelchair according to claim 6, characterized in that the ground supporting assembly (22) further comprises a ground supporting frame (222), and two ends of the ground supporting frame (222) are respectively connected with the two supporting rods (221).

8. The wheelchair as claimed in claim 7, wherein the ground supporting frame (222) is configured as a "U" shaped frame or an "E" shaped frame, and the height of the ground supporting rod of the ground supporting frame (222) is greater than or equal to the distance from the bottom cross beam of the frame body (4) to the ground.

9. The wheelchair as claimed in claim 8, wherein the other end of the second telescopic assembly (23) is connected to the ground frame (222).

10. Wheelchair according to claim 4, further comprising a leg plate arrangement (3), wherein the leg plate arrangement (3) comprises a leg plate (31) and a third telescopic assembly (32), wherein the leg plate (31) is movably connected with the seat plate (21), one end of the third telescopic assembly (32) is connected with the leg plate (31), and the other end of the third telescopic assembly (32) is connected with the top cross beam of the frame body (4).

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