Electric wheelchair

Abstract

The present invention relates to the technical field of means of transport. Disclosed is an electric wheelchair, comprising a chair assembly, front wheels, a rear-wheel folding assembly and a driving member. The rear-wheel folding assembly comprises a first connecting seat, a front connecting rod, a rear driving push rod, a main beam frame, a connecting beam frame and rear wheels, wherein the upper end of the front connecting rod and the upper end of the main beam frame are rotationally connected to the first connecting seat in sequence in a front-rear direction, and the lower end of the front connecting rod and the front end of the connecting beam frame are both rotationally connected to the lower end of the main beam frame; two ends of the rear driving push rod are respectively rotationally connected to the upper end of the main beam frame and the connecting beam frame; the rear wheels are connected to the connecting beam frame; the seat assembly is detachably connected to the first connecting seat; the lower end of the main beam frame is detachably connected to the front wheels; and the driving member is in transmission connection with at least the rear wheels. The electric wheelchair of the present invention can be integrally folded without disassembly, thereby preventing loss of components; and the electric wheelchair can also be disassembled into several components and are then folded, thereby meeting the requirements of storage in a small space, and facilitating carrying.

Description

An electric wheelchair Technical Field

[0001] The present invention relates to the technical field of travel tools, and in particular to an electric wheelchair. Background Art

[0002] To facilitate transportation and storage, existing electric wheelchairs are designed to be foldable. While the folded structure reduces the overall size, it is heavy, making it difficult to store and carry. Furthermore, existing electric wheelchairs are designed to be disassembled and then folded, separating the components into several parts for easier storage and transportation. However, the large number of disassembled parts makes them easily lost, and they are not user-friendly for users with limited assembly skills, making them unable to meet the needs of multiple users simultaneously.

[0003] Summary of the Invention

[0004] The purpose of the present invention is to provide an electric wheelchair that can be folded into one piece without disassembly when there is sufficient storage space, thereby preventing the loss of parts and eliminating the need for reassembly when reused. When the storage space is small, the electric wheelchair can be disassembled into several parts and then folded to meet the storage needs of a small space and facilitate transportation.

[0005] In order to achieve the above-mentioned objectives, the present invention provides an electric wheelchair, including a seat assembly, a front wheel, a rear wheel folding assembly and a driving member, the rear wheel folding assembly including a first connecting seat, a front connecting rod, a rear driving push rod, a main beam frame, a connecting beam frame and a rear wheel, the upper end of the front connecting rod and the upper end of the main beam frame are rotatably connected to the first connecting seat in sequence along the front and rear directions, the lower end of the front connecting rod and the front end of the connecting beam frame are respectively rotatably connected to the lower end of the main beam frame, the two ends of the rear driving push rod are respectively rotatably connected to the upper end of the main beam frame and the connecting beam frame, the rear wheel is connected to the connecting beam frame, the seat assembly is detachably connected to the first connecting seat, the lower end of the main beam frame is detachably connected to the front wheel, and the driving member is at least transmission-connected to the rear wheel.

[0006] As a preferred embodiment, the seat assembly includes a seat back, a seat cushion and a seat connecting portion, the seat back is connected to the rear end of the seat cushion, the seat connecting portion is connected to one end of the seat cushion facing the first connecting seat, and the first connecting seat and the seat connecting portion are slidably installed along the front and rear directions.

[0007] As a preferred solution, the first connecting seat is provided with a plug-in slot opening forward, the seat connecting part is provided with a plug-in block arranged corresponding to the position of the plug-in slot, the plug-in block is slidably installed in the plug-in slot, the front end of the seat connecting part is provided with a seat limiting part extending downward, the seat limiting part is connected to the front end of the plug-in block, the front end of the first connecting seat is provided with a locking part, the seat limiting part is located at the front end of the plug-in slot and is detachably connected to the locking part.

[0008] As a preferred solution, the seat limiting portion is provided with a locking slot with an opening facing downward, and the locking portion includes a positioning rod and an eccentric locking rod. The first end of the positioning rod is rotatably connected to the first connecting seat, and the second end of the positioning rod extends out of the front end of the first connecting seat. The eccentric locking rod is rotatably connected to the second end of the positioning rod. The positioning rod is installed in the locking slot, and the peripheral side surface of the eccentric locking rod is provided with a locking surface. When the locking surface is in contact with the seat limiting portion, the seat limiting portion is confined between the locking surface and the first connecting seat.

[0009] As a preferred solution, a locking extension arm is provided at the bottom of the first connecting seat, which is located below the plug-in slot and extends forward. The locking portion includes an operating push rod and a locking rod. The upper end of the operating push rod is rotatably connected to the locking extension arm. The locking rod extends along the width direction and is connected to the operating push rod. The seat limiting portion is located between the front end of the plug-in slot and the locking rod. When the operating push rod rotates backward, the outer peripheral surface of the locking rod abuts and locks with the front end of the seat limiting portion.

[0010] As a preferred solution, when the operating push rod extends downward, a locking avoidance channel is formed above the locking rod, and the seat limiting portion is installed in the plug-in slot through the locking avoidance channel.

[0011] As a preferred solution, the seat connecting portion is provided with a seat unlocking portion located at the front end of the seat locking portion, the upper end of the seat unlocking portion is connected to the front end of the plug-in block, the lower end of the seat unlocking portion extends downward to form an unlocking end, the locking portion is located between the seat locking portion and the seat unlocking portion in the front-to-back direction, the operating push rod rotates forward, and the operating push rod pushes the unlocking end to move forward.

[0012] As a preferred embodiment, the plug-in slot includes two oppositely arranged slot side walls and a slot bottom surface, the slot bottom surface is connected to the lower ends of the slot side walls on both sides in the width direction, the rear end width of the slot bottom surface is smaller than the front end width of the slot bottom surface, and the shape of the plug-in block is matched with the shape of the plug-in slot.

[0013] As a preferred solution, the side wall of the groove is provided with a first limiting inclined surface, and the opposite sides of the plug-in block are respectively provided with a second limiting inclined surface, and the first limiting inclined surface is in close contact with the second limiting inclined surface.

[0014] As a preferred solution, the plug-in slot includes a slot end face, the slot end face is provided with a first wiring terminal, the plug-in block is provided with a second wiring terminal facing the slot end face, and the first wiring terminal is electrically connected to the second wiring terminal by plugging.

[0015] As a preferred solution, the rear wheel folding assembly includes a power supply and a controller, which are electrically connected to the first terminal respectively, and the seat assembly includes an operating handle, which is electrically connected to the second terminal.

[0016] As a preferred solution, a first connecting rod and a lock are provided at the lower end of the main beam frame, the front wheel includes a second connecting rod and a connecting arm extending toward the first connecting rod, the connecting arm is provided with a first connecting portion, the first connecting portion is detachably connected to the first connecting rod, and the lock is detachably connected to the first connecting rod.

[0017] As a preferred solution, the lower end of the main beam frame is provided with an assembly cavity opening downward, and the first connecting rod and the lock buckle are connected to the assembly cavity.

[0018] As a preferred solution, the first connecting rod is connected to the rear end of the assembly cavity, the lock buckle is connected to the front end of the assembly cavity by rotating around the width direction, the lock buckle is a hook structure, and the lower end of the main beam frame is provided with a limiting groove opening downward, and the second connecting rod is installed in the limiting groove. When the lock buckle locks the second connecting rod, one of the side walls of the limiting groove is corresponding to the position of the lock buckle in the front-to-back direction when locking, and the second connecting rod is located between the bottom surface of the limiting groove and the lock buckle in the height direction, and the first connecting part is a groove structure opening toward the rear end.

[0019] As a preferred embodiment, the seat assembly includes a bottom bracket, a first rod, a second rod, and an armrest, the seat back is detachably connected to the bottom bracket, one end of the bottom bracket is connected to the seat cushion, the other end of the bottom bracket is provided with a first rotating portion and a second rotating portion, one end of the first rod is rotatably connected to the first rotating portion to form a first axis, the other end of the first rod is rotatably connected to one end of the second rod to form a second axis, the other end of the second rod and the armrest are respectively rotatably connected to the seat back to form a third axis, and the seat back is rotatably connected to the second rotating portion to form a fourth axis;

[0020] The first axis, the second axis, the third axis and the fourth axis extend in the width direction and are arranged in parallel, respectively. The first axis, the second axis, the third axis and the fourth axis are projected on the projection surface along the width direction to form a first projection point, a second projection point, a third projection point and a fourth projection point, respectively. The first projection point, the second projection point, the third projection point and the fourth projection point are connected in sequence on the projection surface to form a quadrilateral.

[0021] As a preferred embodiment, at least one side of the chair back is provided with a chair back connecting portion, and the chair back connecting portion includes a connecting column and a first limit block, the first limit block is located at the outer periphery of the connecting column, the first limit block is provided with a first matching surface of the chair back, one end of the second rod body is provided with a second limit block and a rod body ring, the second limit block is located at the edge of the rod body ring, the second limit block is provided with a first matching surface of the rod body, one end of the armrest is provided with an armrest ring and a third limit block, the third limit block is provided with a first matching surface of the armrest and a second matching surface of the armrest, the first matching surface of the armrest is provided with a second matching surface of the armrest A rotation gap is formed between the mating surfaces in the circumferential direction, the first limit block and the second limit block are located in the rotation gap, the connecting column, the rod ring and the armrest ring are coaxially rotatably connected, the second limit block is radially located between the armrest ring and the first limit block, the armrest includes a use state and a folded state, when the armrest is in the use state, the first mating surface of the chair back is in contact with the first mating surface of the armrest, when the armrest is in the folded state, the first mating surface of the rod body is in contact with the first mating surface of the armrest, and the first mating surface of the chair back is separated from the first mating surface of the armrest.

[0022] As a preferred embodiment, the first limiting block is provided with a second limiting surface of the chair back, and the armrest includes a yielding state. When the armrest is in the yielding state, the second mating surface of the armrest is in contact with the second limiting surface of the chair back, forming a side entry and exit channel between the armrest and the side of the seat cushion.

[0023] As a preferred solution, when the armrest is in use, there is a gap between the first mating surface of the rod body and the first mating surface of the armrest.

[0024] As a preferred solution, the main beam frame includes a main side rod, an upper connecting rod and a lower connecting rod, the upper connecting rod and the lower connecting rod extend in the width direction respectively, the two ends of the upper connecting rod and the two ends of the lower connecting rod are respectively connected to the main side rods to form a frame structure, the two ends of the front connecting rod are respectively rotatably connected to the lower connecting rod and the front end of the first connecting seat, and the two ends of the rear driving push rod are respectively rotatably connected to the upper connecting rod and the connecting beam frame.

[0025] As a preferred solution, the connecting beam frame includes a bottom link, a middle support link and a rear connecting plate, the bottom link extends in the front-to-back direction, the middle support link and the rear connecting plate are respectively connected to the bottom link on both sides in the width direction, the front end of the bottom link is rotatably connected to the lower end of the main beam frame, and the lower end of the rear drive push rod is rotatably connected to the middle support link.

[0026] As a preferred solution, the bottom connecting rod includes a first rod segment and a second rod segment, the first rod segment extends upward at an angle, the upper end of the first rod segment is rotatably connected to the lower end of the main beam frame, the lower end of the first rod segment is connected to the front end of the second rod segment, and the rear end of the second rod segment is fixedly connected to the rear connecting plate.

[0027] As a preferred solution, the rear connecting plate is provided with bottom connecting plates on both sides in the width direction, the bottom connecting plates are connected to the rear connecting plate by rotating around the front and rear directions, and the side of the bottom connecting plate away from the rear connecting plate is connected to the rear wheel.

[0028] Compared to the prior art, an electric wheelchair according to an embodiment of the present invention has the following advantages: it includes a seat assembly, front wheels, a rear wheel folding assembly, and a drive element. A user sits in the seat assembly, which supports the user. The rear wheel folding assembly supports the seat assembly and enables angle and height adjustment of the seat assembly. Specifically, the rear wheel folding assembly includes a first connecting seat, a front connecting rod, a rear drive push rod, a main beam frame, a connecting beam frame, and a rear wheel. The upper end of the front connecting rod and the upper end of the main beam frame are pivotally connected to the first connecting seat in a forward and backward direction. The lower end of the front connecting rod and the front end of the connecting beam frame are pivotally connected to the lower end of the main beam frame. The two ends of the rear drive push rod are pivotally connected to the upper end of the main beam frame and the connecting beam frame. The rear drive push rod extends when the wheelchair is moving uphill and shortens when the wheelchair is moving downhill, thereby compensating the seat assembly's angle to adjust its center of gravity. This allows the seat assembly to remain parallel or substantially parallel to the ground both when moving uphill and downhill, thereby improving the user's comfort when using the wheelchair uphill and downhill. The rear drive push rod is shortened, allowing the rear wheel folding assembly to fold completely. The seat assembly and front wheels are separately connected to the rear wheel folding assembly to form a foldable unit, making it easy to store and transport. This prevents component loss and eliminates the need for assembly for reuse, making it convenient to use. The bottom of the seat assembly is detachably connected to the first connecting seat, and the lower end of the main beam frame is detachably connected to the front wheel. When the storage space is insufficient to accommodate the entire folded unit, the seat assembly is separated from the first connecting seat, and the main beam frame is separated from the front wheel. The seat assembly, front wheel, and folded rear wheel folding assembly form three main components, each occupying less space and weighing less, meeting the needs of small spaces and facilitating transport. Furthermore, there is no restriction on the order of operation for assembling, disassembling and folding the seat assembly, front wheels and rear wheel folding assembly. They can be disassembled first and then folded, or folded first and then disassembled, or the seat assembly and the rear wheel folding assembly can be assembled or disassembled first, and then the rear wheel folding assembly and the front wheel can be assembled or disassembled, or the rear wheel folding assembly and the front wheel can be assembled or disassembled first, and then the seat assembly and the rear wheel folding assembly can be assembled or disassembled. This reduces the operational restrictions on assembly and disassembly of the wheelchair and reduces the difficulty of wheelchair assembly and disassembly operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1 is a schematic diagram of the overall structure of an embodiment of the present invention.

[0030] FIG2 is a schematic structural diagram of an embodiment of the present invention in a folded state.

[0031] FIG3 is a structural diagram of a seat assembly according to an embodiment of the present invention.

[0032] FIG4 is a schematic structural diagram of the rear wheel folding assembly connected to the front wheel after being folded according to an embodiment of the present invention.

[0033] FIG5 is a schematic structural diagram of the rear wheel folding assembly after folding according to an embodiment of the present invention.

[0034] FIG6 is a schematic structural diagram of the front wheel according to an embodiment of the present invention.

[0035] FIG7 is a schematic structural diagram of a first connecting socket according to an embodiment of the present invention.

[0036] FIG8 is a schematic structural diagram of the lower end of the first connecting socket according to an embodiment of the present invention.

[0037] FIG. 9 is a schematic structural diagram of a seat connection portion according to an embodiment of the present invention.

[0038] FIG. 10 is a structural diagram of a seat connection portion from another perspective according to an embodiment of the present invention.

[0039] FIG. 11 is a structural schematic diagram of a seat connecting portion and a first connecting seat according to another embodiment of the present invention.

[0040] FIG12 is a cross-sectional view of the structure of another embodiment of the present invention when the seat connecting portion and the first connecting seat are in a locked state.

[0041] FIG13 is a schematic structural diagram of a first connecting socket according to another embodiment of the present invention.

[0042] FIG. 14 is a schematic structural diagram of a seat connection portion according to another embodiment of the present invention.

[0043] FIG15 is a structural cross-sectional view of a seat connecting portion and a first connecting seat in an unlocked state according to another embodiment of the present invention.

[0044] FIG16 is a schematic structural diagram of the connection between the main beam frame and the front wheel according to an embodiment of the present invention.

[0045] FIG17 is a schematic structural diagram of the main beam frame according to an embodiment of the present invention.

[0046] 18 is a side view of a seat assembly according to an embodiment of the present invention.

[0047] FIG19 is an enlarged structural diagram of point A in FIG14 according to an embodiment of the present invention.

[0048] 20 is a schematic diagram of the overall structure of the seat assembly and the rear folding assembly in the folded state according to an embodiment of the present invention.

[0049] FIG21 is an enlarged structural diagram of point B in FIG15 according to an embodiment of the present invention.

[0050] 22 is a structural diagram of the seat assembly in a folded state according to an embodiment of the present invention.

[0051] FIG23 is a schematic structural diagram of a chair back support according to an embodiment of the present invention.

[0052] FIG24 is a schematic structural diagram of the bottom bracket according to an embodiment of the present invention.

[0053] FIG25 is a schematic structural diagram of an armrest according to an embodiment of the present invention.

[0054] FIG26 is a schematic structural diagram of the second rod body according to an embodiment of the present invention.

[0055] FIG27 is a structural diagram of an armrest in a yielding state according to an embodiment of the present invention.

[0056] FIG28 is an enlarged structural diagram of point C in FIG22 according to an embodiment of the present invention.

[0057] FIG29 is a partial structural diagram of the rear wheel folding assembly according to an embodiment of the present invention.

[0058] FIG30 is a schematic structural diagram of a connecting beam frame according to an embodiment of the present invention.

[0059] In the figure: 10, seat assembly; 11, seat back; 111, seat back connection portion; 1111, connecting column; 1112, first stopper; 11121, first mating surface of seat back; 11122, second stopper surface of seat back; 112, seat back bracket; 113, back cushion; 12, seat cushion; 121, mounting slope; 13, seat connection portion; 131, plug-in block; 1311, second stopper slope; 1312, second connection terminal; 1313, guide slope; 132, seat stopper; 1321, locking slot; 1322, locking guide slope; 133, seat unlocking portion; 1331, unlocking terminal; 1332, first unlocking portion; 1333, second unlocking portion; 14, bottom bracket; 141, first rotating portion; 142, second rotating portion; 15, first rod; 16, second rod; 161, second stopper; 1611, first mating surface of rod; 1612, second mating surface of rod; 162, rod ring; 163, gap; 17, armrest; 171, armrest ring; 172, third stopper; 1721, first mating surface of armrest; 1722, second mating surface of armrest; 173, rotation gap; 18, side access channel; 20, front wheel; 21, second connecting rod; 22, connecting arm; 23, first connecting portion; 30. Rear wheel folding assembly; 31. Front connecting rod; 32. Rear driving push rod; 33. Rear wheel; 34. First connecting seat; 341. Insertion slot; 3411. Slot side wall; 3412. Slot bottom surface; 3413. Slot end surface; 3414. First terminal; 342. First limiting inclined surface; 343. Locking part; 3431. Positioning rod; 3432. Eccentric locking rod; 3433. Locking surface; 3434. Operating push rod; 3435. Locking rod; 3436. Locking avoidance Allow passage; 344, locking extension arm; 35, main beam frame; 351, first connecting rod; 352, lock buckle; 353, assembly cavity; 354, limit groove; 355, main side rod; 356, upper connecting rod; 357, lower connecting rod; 36, connecting beam frame; 361, bottom connecting rod; 3611, first rod segment; 3612, second rod segment; 362, middle support connecting rod; 363, rear connecting plate; 364, bottom connecting plate; 365, wheel connecting bracket; 366, buffer; 40, driving member; 50, operating handle; 51, power supply; 52, controller; 1, first axis; 2, second axis; 3, third axis; 4, fourth axis. DETAILED DESCRIPTION

[0060] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0061] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0062] In the description of the present invention, it should be understood that the terms "connected," "connected," "fixed," etc. used in the present invention should be interpreted broadly. For example, the terms may be fixedly connected, detachably connected, or integrated; may be mechanically connected or welded; may be directly connected or indirectly connected through an intermediate medium; may be internal communication between two elements or an interactive relationship between two elements, unless otherwise clearly defined. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] In the description of the present invention, it should be understood that the vehicle's forward direction is the front-to-back direction, the left-to-right direction perpendicular to the front-to-back direction is the width direction, the width is the length extending along the width direction, the vehicle's lifting direction is the height direction, and the height is the length extending along the height direction.

[0064] As shown in Figures 1 to 18, an electric wheelchair according to a preferred embodiment of the present invention includes a seat assembly 10, a front wheel 20, a rear wheel folding assembly 30 and a driving member 40. The rear wheel folding assembly 30 includes a first connecting seat 34, a front connecting rod 31, a rear driving push rod 32, a main beam frame 35, a connecting beam frame 36 and a rear wheel 33. The upper end of the front connecting rod 31 and the upper end of the main beam frame 35 are rotatably connected to the first connecting seat 34 in sequence along the front and rear directions, the lower end of the front connecting rod 31 and the front end of the connecting beam frame 36 are respectively rotatably connected to the lower end of the main beam frame 35, the two ends of the rear driving push rod 32 are respectively rotatably connected to the upper end of the main beam frame 35 and the connecting beam frame 36, the rear wheel 33 is connected to the connecting beam frame 36, the seat assembly 10 is detachably connected to the first connecting seat 34, the lower end of the main beam frame 35 is detachably connected to the front wheel 20, and the driving member 40 is at least transmission-connected to the rear wheel 33.

[0065] The electric wheelchair of the present invention includes a seat assembly 10, a front wheel 20, a rear wheel folding assembly 30, and a drive member 40, wherein a user sits on the seat assembly 10, and the seat assembly 10 carries the user. The rear wheel folding assembly 30 is used to support the seat assembly 10 and simultaneously achieve angle adjustment and height adjustment of the seat assembly 10. Specifically, the rear wheel folding assembly 30 includes a first connecting seat 34, a front connecting rod 31, a rear driving push rod 32, a main beam frame 35, a connecting beam frame 36, and a rear wheel 33. The upper end of the front connecting rod 31 and the upper end of the main beam frame 35 are rotatably connected to the first connecting seat 34 in sequence along the front-to-back direction, the lower end of the front connecting rod 31 and the front end of the connecting beam frame 36 are rotatably connected to the lower end of the main beam frame 35, and the two ends of the rear driving push rod 32 are rotatably connected to the upper end of the main beam frame 35 and the connecting beam frame 36. When the wheelchair is moving uphill, the rear drive push rod 32 extends, and when the wheelchair is moving downhill, the rear drive push rod 32 shortens, compensating the angle of the seat assembly 10 to adjust the center of gravity. This allows the seat assembly 10 to remain parallel or substantially parallel to the ground both when moving uphill and downhill, enhancing the user's comfort when using the wheelchair. When the rear drive push rod 32 shortens, the rear wheel folding assembly 30 folds as a whole. The seat assembly 10 and the front wheel 20 are separately connected to the rear wheel folding assembly 30 to form a foldable whole, which facilitates storage and transportation, prevents component loss, and eliminates the need for assembly upon reuse, making it convenient. The bottom of the seat assembly 10 is detachably connected to the first connecting seat 34, and the lower end of the main beam frame 35 is detachably connected to the front wheel 20. When the storage space is insufficient to accommodate a folded whole, the seat assembly 10 is disassembled and separated from the first connecting seat 34, and the main beam frame 35 is disassembled and separated from the front wheel 20. The seat assembly 10, the front wheel 20, and the folded rear wheel folding assembly 30 form three major components. Each component occupies less space and weighs less, so as to meet the storage requirements of a small space and facilitate transportation. Furthermore, there is no operational sequence restriction on the assembly, disassembly, and folding sequence of the seat assembly 10, the front wheel 20, and the rear wheel folding assembly 30. The seat assembly 10 can be disassembled first and then folded, or folded first and then disassembled, or the seat assembly 10 and the rear wheel folding assembly 30 can be assembled or disassembled first, and then the rear wheel folding assembly 30 and the front wheel 20 can be assembled or disassembled, or the rear wheel folding assembly 30 and the front wheel 20 can be assembled or disassembled first, and then the seat assembly 10 and the rear wheel folding assembly 30 can be assembled or disassembled. This reduces the operational restrictions on the assembly and disassembly of the wheelchair and reduces the difficulty of the wheelchair assembly and disassembly operation.

[0066] It should be noted that when the wheelchair goes uphill, the two ends of the front connecting rod 31 are respectively connected to the first connecting seat 34 and the lower end of the main beam frame 35. The length of the front connecting rod 31 remains unchanged, and the rear driving push rod 32 extends and drives the main beam frame 35 to rotate in a clockwise direction, compensating the angle of the seat assembly 10, so that the seat assembly 10 moves forward to adjust the center of gravity position, and the seat cushion 12 remains parallel or basically parallel to the ground.

[0067] When the wheelchair goes downhill, the length of the front connecting rod 31 remains unchanged, the rear driving push rod 32 shortens and drives the main beam frame 35 to rotate counterclockwise, compensating the angle of the seat assembly 10, so that the seat assembly 10 moves backward to adjust the center of gravity, and the seat cushion 12 remains parallel or substantially parallel to the ground.

[0068] As one embodiment, the electric wheelchair includes an angle sensor and a controller 52. The angle sensor is mounted on the seat assembly 10, and the controller 52 is electrically connected to the angle sensor and the rear drive push rod 32. The angle sensor receives angle change information from the seat assembly 10 and transmits the angle sensing information to the controller 52. The controller 52 controls the extension and retraction of the rear drive push rod 32 based on the angle change information to keep the seat cushion 12 parallel or substantially parallel to the ground.

[0069] As one embodiment, the electric wheelchair includes an operating handle 50, which is electrically connected to a controller 52. The controller 52 is electrically connected to the rear wheels 33 and the front wheels. The operating handle 50 controls the direction of travel, raising or folding of the wheelchair.

[0070] Furthermore, as shown in Figures 3 to 4, the seat assembly 10 includes a seat back 11, a seat cushion 12 and a seat connecting portion 13. The seat back 11 is connected to the rear end of the seat cushion 12, and the seat connecting portion 13 is connected to one end of the seat cushion 12 toward the first connecting seat 34. The first connecting seat 34 and the seat connecting portion 13 are slidably installed along the front and rear directions to realize the assembly of the first connecting seat 34 and the seat connecting portion 13. The operation is simple and convenient, thereby improving operating efficiency.

[0071] As one embodiment, the rear end of the first connecting seat 34 and the rear end of the seat connecting part 13 are arranged to be tilted downward, and the rear end of the first connecting seat 34 and the rear end of the seat connecting part 13 extend downward, so that the first connecting seat 34 and the seat connecting part 13 are tilted as a whole. When the user sits on the seat cushion 12 and the first connecting seat 34 slides forward relative to the seat connecting part 13, the seat connecting part 13 generates a downward and backward resistance to the first connecting seat 34 to avoid the seat connecting part 13 and the first connecting seat 34 from being quickly separated, so that the seat connecting part 13 and the first connecting seat 34 remain in an installed and connected state, thereby improving safety in use.

[0072] As one embodiment, as shown in FIG3 , a mounting bevel 121 is provided on the bottom surface of the seat cushion 12 , and the rear end of the mounting bevel 121 is tilted downward. The seat connecting portion 13 is connected to the mounting bevel 121 . The seat connecting portion 13 is tilted by the mounting bevel 121 . The mounting bevel 121 is set on the seat to improve processing convenience.

[0073] As one embodiment, the seat back 11 is rotatably connected to the rear end of the seat cushion 12 . When the seat back 11 is stored, it is folded toward the seat cushion 12 to reduce the storage space of the seat assembly 10 .

[0074] Furthermore, as shown in Figures 7 to 10, the first connecting seat 34 is provided with a plug-in slot 341 opening forward, the seat connecting part 13 is provided with a plug-in block 131 arranged corresponding to the position of the plug-in slot 341, the plug-in block 131 is slidably installed in the plug-in slot 341, the front end of the seat connecting part 13 is provided with a seat limiting part 132 extending downward, the seat limiting part 132 is connected to the front end of the plug-in block 131, and the front end of the first connecting seat 34 is provided with a locking part 343, the seat limiting part 132 is located at the front end of the plug-in slot 341 and is detachably connected to the locking part 343. The first connecting seat 34 and the seat connecting portion 13 are mounted in the insertion slot 341 via the plug-in block 131, enabling relative sliding installation. A seat stopper 132 is connected to the front end of the plug-in block 131 and extends downward, limiting the relative sliding position of the plug-in block 131 and the insertion slot 341. The seat stopper 132 is mounted at the front end of the insertion slot 341. When the seat stopper 132 is connected to the locking portion 343, the plug-in block 131 is retained in the insertion slot 341, preventing it from sliding out and ensuring safe use. To remove the seat cushion 12 from the first connecting seat 34, the seat stopper 132 is disconnected from the locking portion 343, separating them. The plug-in block 131 is then slid forward out of the insertion slot 341 for removal. This operation is simple and convenient.

[0075] As one embodiment, the locking portion 343 is a buckle, which is rotatably installed on the first connecting seat 34 around the width direction. The clamping end of the buckle extends upward, and the front end of the clamping end is provided with a guide slope. When the seat limiting portion 132 is installed from front to back, the lower end of the seat limiting portion 132 pushes the buckle along the guide slope to rotate the buckle end downward. When the seat limiting portion 132 moves to the rear side of the buckle end, the buckle end rebounds upward, and the seat limiting portion 132 is clamped to the inner side of the clamping end, which is simple to operate and has high assembly efficiency.

[0076] When the seat limit portion 132 is engaged with the buckle, the buckle is reset by a spring. After a period of use, the spring elasticity loosens, and the seat connection portion 13 and the first connection seat 34 can still slide relative to each other in the front-to-back direction after being locked, causing abnormal noise. In order to avoid abnormal noise, further, as shown in Figures 8 to 9, the seat limit portion 132 is provided with a locking slot 1321 with an opening facing downward, and the locking portion 343 includes a positioning rod 3431 and an eccentric locking rod 3432. The first end of the positioning rod 3431 is rotatably connected to the first connecting seat 34, and the second end of the positioning rod 3431 extends out of the front end of the first connecting seat 34. The eccentric locking rod 3432 is rotatably connected to the second end of the positioning rod 3431. The positioning rod 3431 is installed in the locking slot 1321, and the peripheral side of the eccentric locking rod 3432 is provided with a locking surface 3433. When the locking surface 3433 is in contact with the seat limit portion 132, the seat limit portion 132 is confined between the locking surface 3433 and the first connecting seat 34. The rotation axis of the positioning rod 3431 extends in the width direction. The second end of the positioning rod 3431 rotates forward and is mounted in the locking slot 1321, thereby limiting the width of the seat stopper 132. The eccentric locking rod 3432 is rotatably mounted on the second end of the positioning rod 3431. The eccentric locking rod 3432 is used to lock and remove the seat connection portion 13. Specifically, the rotation axis of the eccentric rod extends in the width direction. The eccentric locking rod 3432 is provided with a locking surface 3433 on its circumferential side. The eccentric locking rod 3432 rotates eccentrically so that the locking surface 3433 contacts the seat stopper 132. The seat stopper 132 is confined between the locking surface 3433 and the first connecting seat 34, preventing relative sliding between the insertion block 131 and the insertion slot 341, thereby locking the seat connection portion 13 and the first connecting seat 34. Because the eccentric locking rod 3432 is mounted eccentrically with respect to its rotational axis, it exerts a greater pressure on the rearward side of the seat stopper 132, enhancing the locking effect between the seat connector 13 and the first connector seat 34 in the fore-aft direction and preventing the first connector seat 34 and the seat connector 13 from sliding relative to each other in the fore-aft direction and causing knocking noise. Rotating the eccentric locking rod 3432 separates the locking surface 3433 from the seat stopper 132, causing the second end of the positioning rod 3431 to rotate downward and disengage from the locking slot 1321. The insertion block 131 then slides forward and disengages from the insertion slot 341, completing the removal of the seat connector 13 from the first connector seat 34.

[0077] Furthermore, as shown in Figures 11-15, a locking extension arm 344 is provided at the bottom of the first connecting base 34, located below the insertion slot 341 and extending forward. The locking portion 343 includes an operating push rod 3434 and a locking rod 3435. The upper end of the operating push rod 3434 is pivotally connected to the locking extension arm 344. The locking rod 3435 extends along the width direction and is connected to the operating push rod 3434. The seat stopper 132 is located between the front end of the insertion slot 341 and the locking rod 3435. When the operating push rod 3434 rotates rearward, the outer circumference of the locking rod 3435 abuts and locks with the front end of the seat stopper 132. The locking extension arm 344 is located below the insertion slot 341 and extends forward, providing space for the locking portion 343 to rotate. When the locking mechanism 343 is in the unlocking state, the locking mechanism 343 is in the unlocking state, and the locking mechanism 343 is in the unlocking state. As shown in Figure 15, the operating push rod 3434 is rotated forward and drives the locking rod 3435 to rotate downward, and the locking rod 3435 is separated from the seat limit part 132, thereby unlocking the first connecting seat 34 and the seat connecting part 13. Compared with the positioning rod 3435 that needs to be installed in the locking slot 1321 and requires positioning operation, the locking rod 3435 and the seat limit part 132 do not need to be positioned, which makes the operation more convenient and efficient.

[0078] Furthermore, as shown in Figures 12-13, when the operating push rod 3434 extends downward, the locking rod 3435 is located below the locking extension arm 344, and a locking avoidance channel 3436 is formed above the locking rod 3435. The seat limit portion 132 is installed in the plug-in slot 341 through the locking avoidance channel 3436 to avoid interference between the seat limit portion 132 and the locking rod 3435, thereby ensuring smooth installation of the plug-in block 131 and the plug-in slot 341.

[0079] Furthermore, as shown in Figures 14-15, the seat connector 13 is provided with a seat unlocking portion 133 located forward of the seat locking portion 343. The upper end of the seat unlocking portion 133 is connected to the front end of the plug block 131, and the lower end of the seat unlocking portion 133 extends downward to form an unlocking end 1331. The locking portion 343 is located between the seat locking portion 343 and the seat unlocking portion 133 in the front-to-back direction. The operating push rod 3434 rotates forward, pushing the unlocking end 1331 forward. The provision of the seat unlocking portion 133 facilitates unlocking of the first connecting seat 34 from the seat connector 13. Specifically, when the operating push rod 3434 rotates forward, the locking rod 3435 rotates downward and separates from the seat limit portion 132, but the plug-in block 131 is still installed in the plug-in slot 341. The operating push rod 3434 rotates further forward, and the operating push rod 3434 applies a forward pushing force to the unlocking end 1331, applying an initial force for the plug-in block 131 to move forward away from the plug-in slot 341. The plug-in block 131 slides forward more smoothly away from the plug-in slot 341, thereby realizing the disassembly of the first connecting seat 34 and the seat connecting portion 13, reducing the difficulty of the disassembly operation, and improving the operating efficiency.

[0080] As one embodiment, as shown in Figures 14-15, the seat unlocking portion 133 includes a first unlocking portion 1332 extending in the front-to-back direction and a second unlocking portion 1333 extending in the up-down direction. The rear end of the first unlocking portion 1332 is connected to the front end of the plug-in block 131, and the front end of the first unlocking portion 1332 is connected to the upper end of the second unlocking portion 1333. The lower end of the second unlocking portion 1333 is the unlocking end 1331. The second unlocking portion 1333 is located in front of the operating push rod 3434. When the operating push rod 3434 extends in the up-down direction, the unlocking end 1331 is located between the upper and lower ends of the operating push rod 3434 in the height direction, so that the operating push rod 3434 pushes the unlocking end 1331 to move forward.

[0081] As one embodiment, as shown in Figure 14, a locking guide slope 1322 is provided at the lower end of the seat limit portion 132, and the lower end of the locking guide slope 1322 extends backward relative to the upper end, so that the outer peripheral surface of the locking rod 3435 can move upward along the locking guide slope 1322 more easily and abut against the seat limit portion 132, making the locking operation smoother.

[0082] In the technical solution for the sliding fit between the slot 341 and the plug block 131, as shown in Figures 7 to 10, the width of the front end of the slot 341 is equal to the width of the rear end. The shape of the plug block 131 corresponds to the shape of the slot 341. During assembly, the width of the slot 341 is greater than the width of the plug block 131, and the height of the slot 341 is greater than the height of the plug block 131. This provides assembly clearance for the plug block 131 to ensure smooth assembly. However, this allows the slot 341 and the plug block 131 to shake relative to each other in the width and height directions, respectively, producing abnormal noise. Furthermore, the slot 341 includes two oppositely disposed slot sidewalls 3411 and a slot bottom surface 3412. The slot bottom surface 3412 is connected to the lower ends of the slot sidewalls 3411 on both sides of the width direction. The rear end width of the slot bottom surface 3412 is less than the front end width of the slot bottom surface 3412. The shape of the plug block 131 matches the shape of the slot 341. The rear end of the plug-in block 131 is inserted from the front end of the plug-in slot 341. Since the rear end width of the slot bottom surface 3412 is smaller than the front end width of the slot bottom surface 3412, the slot width of the plug-in slot 341 is larger than the rear end width of the plug-in block 131, so that the overall width of the rear end of the plug-in slot 341 is smaller than the overall width of the front end of the plug-in slot 341. During assembly, the plug-in block 131 can be easily inserted into the plug-in slot 341 from the slot of the plug-in slot 341, meeting the smooth assembly requirements and improving assembly efficiency.

[0083] As one embodiment, as shown in Figures 7 to 10, the slot side wall 3411 forms an angle a with the front-to-back direction, 3°≤angle a≤10°, so that a larger assembly space is provided when the plug-in block 131 is assembled in the slot of the plug-in slot 341, which facilitates the assembly operation and improves the assembly efficiency.

[0084] As one embodiment, as shown in Figures 9 and 10, the rear ends of the plug-in block 131 on both sides in the width direction are respectively provided with guide bevels 1313, and the rear ends of the guide bevels 1313 extend obliquely toward the inner side of the plug-in block 131, so that when the plug-in block 131 is assembled with the plug-in slot 341, the rear end of the plug-in block 131 is guided by the guide bevels 1313 to be plugged into the notch of the plug-in slot 341, thereby improving the accuracy of the assembly operation and improving the assembly efficiency.

[0085] Furthermore, as shown in Figures 7 to 10, the slot sidewall 3411 is provided with a first limiting bevel 342, and the opposite sides of the plug-in block 131 are respectively provided with a second limiting bevel 1311, with the first limiting bevel 342 and the second limiting bevel 1311 being closely fitted. The close fit of the first limiting bevel 342 and the second limiting bevel 1311 allows the plug-in block 131 to be restricted in height and width relative to the sidewall of the plug-in slot 341, eliminating any clearance between the first limiting bevel 342 and the second limiting bevel 1311 and any abnormal noise caused by the relative sliding of the plug-in block 131 and the plug-in slot 341, further enhancing the user experience.

[0086] As one embodiment, as shown in FIG. 7 to FIG. 10 , the upper end of the first limiting inclined surface 342 extends obliquely toward the inner side of the plug slot 341 , and the upper end of the second limiting inclined surface 1311 extends obliquely toward the inner side of the plug block 131 .

[0087] Furthermore, as shown in Figures 3 to 5, the insertion slot 341 includes a slot end surface 3413, which is provided with a first terminal 3414. The insertion block 131 is provided with a second terminal 1312 facing the slot end surface 3413. The first terminal 3414 is plugged and electrically connected to the second terminal 1312. When the insertion block 131 is installed in the insertion slot 341, the assembly of the seat assembly 10 and the rear wheel folding assembly 30 is completed, and the electrical connection between the seat assembly 10 and the rear wheel folding assembly 30 is also completed, further reducing the difficulty of wheelchair assembly and disassembly and improving wheelchair assembly efficiency.

[0088] As one embodiment, the slot end face 3413 is connected to the slot side wall 3411 at both ends in the width direction, and the plug-in block 131 is inserted into the plug-in slot 341 toward the slot end face 3413. The second terminal 1312 in the plug-in block 131 is plugged into the first terminal 3414 of the slot end face 3413 to achieve electrical connection, which is convenient to operate and has high assembly efficiency.

[0089] Furthermore, as shown in Figures 1 to 5, the rear wheel folding assembly 30 includes a power supply 51 and a controller 52, each of which is electrically connected to the first terminal 3414. The seat assembly 10 includes an operating handle 50, which is electrically connected to the second terminal 1312. The second terminal 1312 is electrically connected to the first terminal 3414, so that an operating signal from the operating handle 50 is transmitted to the controller 52, and the power supply 51 is provided to the operating handle 50.

[0090] As one embodiment, the seat assembly 10 is equipped with a position marker light, which is electrically connected to the operating handle 50 and the second terminal 1312 respectively, and the position marker light is controlled by the operating handle 50.

[0091] As one embodiment, as shown in Figures 1 to 5, the controller 52 is installed on the main beam frame 35, and the wires electrically connecting the rear wheel 33 and the controller 52 are arranged along the hollow structure within the frame of the connecting beam frame 36 and the main beam frame 35. The wires electrically connecting the controller 52 and the first terminal 3414 are arranged along the hollow structure within the frame of the main beam frame 35, so that the connecting wires of the electric wheelchair are built into the connecting beam frame 36 and the main beam frame 35, avoiding a large amount of wires exposed and easily damaged, thereby improving safety in use, and at the same time avoiding the wires from being entangled or interfering with other components during use, folding or assembly, thereby improving the smoothness of the folding and assembly process.

[0092] Furthermore, as shown in Figures 16 to 17 and Figure 6, a first connecting rod 351 and a lock 352 are provided at the lower end of the main beam frame 35. The front wheel 20 includes a second connecting rod 21 and a connecting arm 22 extending toward the first connecting rod 351. The connecting arm 22 includes a first connecting portion 23, which is detachably connected to the first connecting rod 351. The lock 352 is detachably connected to the first connecting rod 351. The first connecting portion 23 is detachably connected to the first connecting rod 351 to achieve initial positioning of the main beam frame 35 and the front wheel 20. The lock 352 and the second connecting rod 21 are used to lock the front wheel 20. When the front wheel 20 needs to be removed, the lock 352 is opened, the second connecting rod 21 is disengaged from the lock 352, and the first connecting portion 23 is separated from the first connecting rod 351. The front wheel 20 can then be removed from the main beam frame 35. The disassembly and assembly operations are simple, efficient, and easy to operate.

[0093] Furthermore, as shown in Figure 17, the lower end of the main beam frame 35 is provided with an assembly cavity 353 that opens downward, and the first connecting rod 351 and the lock 352 are connected to the assembly cavity 353. The assembly cavity 353 opens downward, facilitating upward connection of the first connecting portion 23 and the second connecting rod 21 to the first connecting rod 351 and the lock 352, respectively. Furthermore, the first connecting rod 351 and the lock 352 are located within the assembly cavity 353. Since the user's movement space is primarily above the assembly cavity 353, this effectively prevents the user from accidentally triggering the lock 352 during use, which could cause the front wheel 20 to separate from the main beam frame 35 and create a dangerous situation, thereby improving user safety.

[0094] In one embodiment, the first connecting portion 23 is a hole-like structure. The lower end of the main beam frame 35 is provided with a connecting hole. The first connecting rod 351 passes through the connecting hole and the first connecting portion 23, thereby achieving a preliminary connection between the main beam frame 35 and the front wheel 20. The second connecting portion is then locked by a lock 352. The lock 352 is a resilient return hook structure. This resilient return hook structure is an existing structure and will not be described in detail here. However, since this technical solution makes the first connecting portion 23 easily lost after removal, further improvements are needed.

[0095] Furthermore, as shown in Figures 16 to 17 and Figure 6, the first connecting rod 351 is connected to the rear end of the assembly cavity 353, and the lock buckle 352 is connected to the front end of the assembly cavity 353 by rotating around the width direction. The lock buckle 352 is a hook structure, and the lower end of the main beam frame 35 is provided with a limiting groove 354 opening downward. The second connecting rod 21 is installed in the limiting groove 354. When the lock buckle 352 locks the second connecting rod 21, one of the groove side walls 3411 of the limiting groove 354 and the lock buckle 352 are corresponding to the position in the front and rear directions when locking. The second connecting rod 21 is located between the groove bottom surface 3412 of the limiting groove 354 and the lock buckle 352 in the height direction, and the first connecting part 23 is a groove structure with an opening toward the rear end. The first connecting rod 351 is fixed to the lower end of the main beam frame 35. When the main beam frame 35 and the front wheel 20 are assembled, the first connecting rod 351 is installed in the slot body through the opening of the first connecting portion 23 to achieve initial positioning. Since the opening of the first connecting portion 23 is toward the rear end, the front wheel 20 is prevented from further rearward movement, thereby limiting the position of the front wheel 20. After the second connecting rod 21 is installed and locked with the lock buckle 352, since one of the slot side walls 3411 of the limiting slot 354 corresponds to the position of the lock buckle 352 in the front-to-back direction when locked, the slot side wall 3411 limits the second connecting rod 21 from further forward movement, preventing the second connecting rod 21 from accidentally moving forward and opening the lock buckle 352, thereby improving safety in use. The second connecting rod 21 is positioned vertically between the bottom surface 3412 of the limiting groove 354 and the latch 352. The bottom surface 3412 of the limiting groove 354 and the latch 352 define the installation position and installation space of the second connecting rod 21 in the vertical direction, preventing the second connecting rod 21 from having excessive vertical movement space, which could cause collision with other components and deformation or abnormal noise. Because the first connecting rod 351 is fixed below the main beam frame 35, the first connecting portion 23 is a slot structure that is directly mounted on the first connecting rod 351. The first connecting rod 351 does not need to be disassembled, reducing the number of components after disassembly and preventing loss of components after disassembly.

[0096] As one embodiment, as shown in FIG17 , the lock 352 includes a hook body, an operating part, and an elastic reset part. One end of the operating part is connected to the upper end of the hook body, and the other end of the operating part extends to the front end. The elastic reset part is respectively connected to the lower end of the hook body and the main beam frame 35. The hook body opening faces the rear, and the hook body rotates in the width direction. When the front wheel 20 needs to be disassembled from the main beam frame 35, the operating part is pushed upward, and the hook body rotates counterclockwise. The elastic reset part is compressed, and the hook body is separated from the second connecting rod 21, and the push on the operating part is released. The elastic reset part rebounds and causes the hook body to return to the locked position. The operating part is located in the assembly cavity 353 to avoid misoperation of the operating part and improve safety in use. The elastic reset part is preferably a spring.

[0097] As one embodiment, the opening of the lock buckle 352 is arranged toward the rear end so that the operating portion faces the front, which makes the disassembly operation easier.

[0098] As one embodiment, as shown in Figure 6, the front wheel 20 includes a pedal and a front wheel 20 body, the front wheel 20 body is respectively connected to the opposite sides of the pedal, the rear end of the pedal is connected to at least two connecting arms 22 extending backward, the lock 352 is located between two adjacent connecting arms 22, the two ends of the second connecting rod 21 are respectively connected to the connecting arms 22 and extend to both sides to be installed in the limiting groove 354, and the limiting groove 354 is connected to the assembly cavity 353.

[0099] As one embodiment, as shown in FIG6 , the front wheel 20 includes a baffle, which is connected to the front end of the connecting arm 22 and is located correspondingly below the lock 352. Since the assembly cavity 353 opens downward, the baffle can prevent the main beam frame 35 from being separated from the front wheel 20 due to ground obstacles pushing open the lock 352 during the driving of the electric wheelchair, thereby improving the safety of use.

[0100] As one embodiment, the pedal, the connecting arm 22 , the second connecting rod 21 and the baffle are an integrally formed structure, which has high processing efficiency.

[0101] Furthermore, as shown in Figures 18 to 23, the seat assembly 10 includes a bottom bracket 14, a first rod 15, a second rod 16 and an armrest 17. The seat back 11 is detachably connected to the bottom bracket 14. One end of the bottom bracket 14 is connected to the seat cushion 12. The other end of the bottom bracket 14 is provided with a first rotating portion 141 and a second rotating portion 142. One end of the first rod 15 is rotatably connected to the first rotating portion 141 to form a first axis 1. The other end of the first rod 15 is rotatably connected to one end of the second rod 16 to form a second axis 2. The other end of the second rod 16 and the armrest 17 are respectively rotatably connected to the seat back 11 to form a third axis 3. The seat back 11 is rotatably connected to the second rotating portion 142 to form a fourth axis 4.

[0102] The first axis 1, the second axis 2, the third axis 3 and the fourth axis 4 extend in the width direction and are arranged in parallel. The first axis 1, the second axis 2, the third axis 3 and the fourth axis 4 are projected onto the projection surface along the width direction to form a first projection point, a second projection point, a third projection point and a fourth projection point. The first projection point, the second projection point, the third projection point and the fourth projection point are connected in sequence on the projection surface to form a quadrilateral. The seat back 11 is detachably connected to the bottom bracket 14, and the seat back 11 rotates forward along the width direction to be folded with the seat cushion 12, wherein one end of the bottom bracket 14 is connected to the seat cushion 12 for fixation, and the other end of the bottom bracket 14 is provided with a first rotating portion 141 and a second rotating portion 142, the first rotating portion 141 is connected to one end of the first rod 15, and the other end of the first rod 15 is rotatably connected to one end of the second rod 16, one end of the second rod 16 and one end of the armrest 17 are rotatably connected to the seat back 11, and the seat back 11 is rotatably connected to the second rotating portion 142 to form a parallelogram. During the folding process, the line connecting the first projection point, the second projection point, the third projection point and the fourth projection point on the projection plane always maintains a quadrilateral, and the second rod 16 drives the armrest 17 to rotate synchronously relative to the seat back 11, so that the armrest 17 maintains or basically maintains the initial installation angle, thereby preventing the armrest 17 from extending downward to the bottom of the seat cushion 12 after folding, causing additional collision or interference, thereby improving safety in use.

[0103] As one embodiment, the first axis 1, the second axis 2, the third axis 3 and the fourth axis 4 extend in the width direction and are arranged in parallel. The first axis 1, the second axis 2, the third axis 3 and the fourth axis 4 are projected on the projection surface along the width direction to form a first projection point, a second projection point, a third projection point and a fourth projection point. The first projection point, the second projection point, the third projection point and the fourth projection point are connected in sequence on the projection surface to form a parallelogram, so that the switching operation of the armrest between the folding and use states is smoother.

[0104] As one embodiment, the armrest 17 always maintains a horizontal or substantially horizontal state as a whole.

[0105] As one embodiment, as shown in FIG. 18 , the operating handle 50 is mounted on an end of the armrest 17 that is away from the second rod 16 in the front-to-back direction.

[0106] Further, as shown in Figures 18 to 26, at least one side of the chair back 11 is provided with a chair back connection portion 111, the chair back connection portion 111 includes a connecting column 1111 and a first limit block 1112, the first limit block 1112 is located on the periphery of the connecting column 1111, the first limit block 1112 is provided with a first seat back mating surface 11121, one end of the second rod body 16 is provided with a second limit block 161 and a rod body ring 162, the second limit block 161 is located at the edge of the rod body ring 162, and the second limit block 1 61 is provided with a first mating surface 1611 of the rod body, one end of the armrest 17 is provided with an armrest ring 171 and a third limiting block 172, the third limiting block 172 is provided with a first armrest mating surface 1721 and a second armrest mating surface 1722, a rotation gap 173 is formed between the first armrest mating surface 1721 and the second armrest mating surface 1722 in the circumferential direction, the first limiting block 1112 and the second limiting block 161 are located in the rotation gap 173, the connecting column 1111, the rod body ring 162 and the armrest ring 171 The armrest 17 is coaxially rotatably connected, with the second stopper 161 radially located between the armrest ring 171 and the first stopper 1112. The armrest 17 has an in-use state and a folded state. When the armrest 17 is in the in-use state, the first mating surface 11121 of the seat back abuts the first mating surface 1721 of the armrest. When the armrest 17 is folded, the first mating surface 1611 of the rod body abuts the first mating surface 1721 of the armrest, and the first mating surface 11121 of the seat back abuts the first mating surface 1721 of the armrest. The rod ring 162 and the armrest ring 171 are respectively sleeved on the connecting post 1111. The rod ring 162 and the armrest ring 171 can rotate coaxially relative to the connecting post 1111, while simultaneously securing the rod ring 162 and the armrest ring 171. The second stopper 161 is radially positioned between the armrest ring 171 and the first stopper 1112, allowing the armrest first mating surface 1721 to abut against either the chair back first mating surface 11121 or the rod body first mating surface 1611, thereby enabling the armrest 17 to transition between different states. When the armrest 17 is in use, the armrest first mating surface 1721 abuts against the chair back first mating surface 11121, and the chair back first mating surface 11121 of the first stopper 1112 limits the armrest first mating surface 1721, preventing further clockwise rotation of the armrest 17. This allows the armrest 17 to remain horizontal or substantially horizontal, providing support for the user. When the armrest 17 is changed from the use state to the folded state, the first rod body 15 drives the second rod body 16 to rotate counterclockwise, the rod body ring 162 rotates relative to the connecting column 1111, the first mating surface 1611 of the rod body is in contact with the first mating surface 1721 of the armrest and drives the armrest ring 171 to rotate relative to the connecting column 1111, and the second rod body 16 drives the armrest 17 to rotate synchronously, so that the angle of the armrest 17 in the use state and the folded state remains unchanged or basically remains unchanged.

[0107] Furthermore, as shown in Figures 27 and 28, the first stopper 1112 is provided with a second seatback stopper surface 11122. The armrest 17 has a yielding state. When the armrest 17 is in the yielding state, the armrest second mating surface 1722 abuts against the seatback second mating surface 11122, forming a side access passage 18 between the armrest 17 and the side of the seat cushion 12. Manually lifting the armrest 17 and rotating it counterclockwise causes the seatback second mating surface 11122 to abut against the armrest second mating surface 1722. Further counterclockwise rotation of the armrest 17 is prevented by the seatback second mating surface 11122. The armrest 17 is in a vertical or substantially vertical state. The armrest 17 rotates upward counterclockwise to eliminate interference with the side of the seat cushion 12, forming a side access passage 18 between the armrest 17 and the side of the seat cushion 12. The user can enter and exit the seat through the side access passage 18 or from the front, providing more options for entering and exiting the seat.

[0108] As one embodiment, as shown in Figure 19, the first mating surface 11121 of the chair back, the second mating surface of the chair back 11, the first mating surface 1611 of the rod body, the second mating surface 1612 of the rod body, the first mating surface 1721 of the armrest and the second mating surface 1722 of the armrest extend in the radial direction respectively to improve the fit between the first mating surface 11121 of the chair back and the first mating surface 1611 of the rod body and the first mating surface 1721 of the armrest, and to improve the fit between the second mating surface of the chair back 11 and the second mating surface 1722 of the armrest.

[0109] Furthermore, as shown in FIG19 , when the armrest 17 is in use, a gap 163 is defined between the first mating surface 1611 of the rod body and the first mating surface 1721 of the armrest. The gap 163 prevents force transmission between the first mating surface 1611 of the rod body and the first mating surface 1721 of the armrest during use. Consequently, the second rod 16 is free of stress during use, reducing the duration of stress on the second rod 16 and preventing deformation or breakage of the second rod 16 due to prolonged stress, thereby extending the service life of the second rod 16.

[0110] As one embodiment, as shown in Figure 28, when the armrest 17 is in the yielding state, there is a gap 163 between the second mating surface 1612 of the rod body and the second mating surface 1722 of the armrest. The gap 163 avoids the transmission of the force between the second mating surface 1612 of the rod body and the second mating surface 1722 of the armrest in the yielding state, and thus the second rod body 16 is in a stress-free state in the yielding state, reducing the stress-bearing time of the second rod body 16, avoiding deformation or breakage of the second rod body 16 due to long-term stress, and extending the service life of the second rod body 16.

[0111] As one embodiment, as shown in Figure 13, the chair back 11 includes a chair back bracket 112 and a back cushion 113, the back cushion 113 is connected to the front end of the chair back bracket 112, the chair back connecting portion 111 is arranged on the opposite sides of the chair back bracket 112 in the width direction, and the lower end of the chair back bracket 112 is provided with a second matching portion and a buckle, the second matching portion is rotatably connected to the second rotating portion 142, so that the chair back bracket 112 can rotate relative to the bottom bracket 14, and the buckle is clamped to the bottom bracket 14 to achieve locking or folding of the chair back bracket 112.

[0112] Furthermore, as shown in Figures 5 and 27, the main beam frame 35 includes a main side rod 355, an upper connecting rod 356, and a lower connecting rod 357. The upper connecting rod 356 and the lower connecting rod 357 extend in the width direction respectively. The ends of the upper connecting rod 356 and the ends of the lower connecting rod 357 are connected to the main side rod 355 to form a frame structure. The ends of the front connecting rod 31 are respectively rotatably connected to the lower connecting rod 357 and the front end of the first connecting seat 34. The ends of the rear driving push rod 32 are respectively rotatably connected to the upper connecting rod 356 and the connecting beam frame 36. The upper connecting rod 356, the main side rod 355, and the lower connecting rod 357 are sequentially connected to form a frame structure, which improves the support strength of the seat in the height direction. The lower end of the front connecting rod 31 is rotationally connected to the lower connecting rod 357, and the upper end of the front connecting rod 31 is rotationally connected to the front end of the first connecting seat 34. The upper end of the rear driving push rod 32 is rotationally connected to the upper connecting rod 356, and the lower end of the rear driving push rod 32 is rotationally connected to the connecting beam frame 36. Based on the frame structure in the height direction, the rear driving push rod 32 is rotationally connected to the upper connecting rod 356 to form a T-shaped support structure in the width direction. The front connecting rod 31 is rotationally connected to the lower connecting rod 357 to form an inverted T-shaped support structure in the width direction. The T-shaped support structure and the inverted T-shaped support structure improve the support stability of the seat in the width direction. When the electric seat is going uphill or downhill, the length of the inverted T-shaped structure remains unchanged. Only the length of the T-shaped structure needs to be adjusted, which simplifies the angle adjustment strategy and helps improve the stability of the seat angle adjustment.

[0113] As one embodiment, the total length of the front connecting rod 31 is set to a fixed value, which makes the overall structure simpler and reduces the production cost.

[0114] In one embodiment, the front connecting rod 31 is a telescopic push rod. The distance between the ends of the front connecting rod 31 connected to the first connecting seat 34 and the lower connecting rod 357, respectively, is adjustable. That is, the total length of the front connecting rod 31 can be adjusted according to actual needs. The front driving push rod 31 and the rear driving push rod 32 extend simultaneously to place the user at a higher height than when sitting, making it easier to reach items at high places and meeting more user needs. The front connecting rod 31 and the rear driving push rod 32 shorten simultaneously, allowing the rear wheel folding assembly 30 to fold as a whole. The seat assembly 10 and the front wheels 20 are respectively connected to the rear wheel folding assembly 30 to form a foldable whole. This facilitates storage and transportation, prevents component loss, and eliminates the need for assembly when reused, making it convenient to use.

[0115] In one embodiment, the controller 52 is electrically connected to the angle sensor, the front connecting rod 31, and the rear driving rod 32. When the user needs to raise the seat cushion 12 above the sitting height, the controller 52 controls the front connecting rod 31 and the rear driving rod 32 to extend simultaneously. Furthermore, the controller controls the length of the front connecting rod 31 and the rear driving rod 32 based on the angle change information from the angle sensor to ensure that the seat cushion 12 always remains horizontal or substantially horizontal, ensuring user safety.

[0116] As one embodiment, as shown in FIG5 , the front connecting rod 31 is connected to the middle portion of the lower connecting rod 357 in the width direction, and the rear driving push rod 32 is connected to the middle portion of the upper connecting rod 356 in the width direction, so that the seat angle adjustment stability is better.

[0117] Furthermore, as shown in Figures 27 and 30, the connecting beam frame 36 includes a bottom link 361, a middle support link 362, and a rear connecting plate 363. The bottom link 361 extends in the front-to-back direction. The middle support link 362 and the rear connecting plate 363 are connected to the bottom link 361 on either side of the width direction. The front end of the bottom link 361 is pivotally connected to the lower end of the main beam frame 35, and the lower end of the rear driving push rod 32 is pivotally connected to the middle support link 362. The bottom link 361, the middle support link 362, and the rear connecting plate 363 are connected to form a bottom frame structure. The middle support link 362 is located in front of the rear connecting plate 363, so that the rear driving push rod 32 and the middle support link 362 form a rearward-inclined T-shaped support structure. Under the premise of the same model of rear driving push rod 32, the main beam frame 35 can move in the front-to-back direction and in the height direction, that is, the angle compensation range and the lifting height of the seat are increased, which can meet the needs of driving on larger slopes and increase the seat height lifting range. At the same time, since the rear wheel 33 will generate a force in the height direction when crossing an obstacle, the rear wheel 33 is connected to the rear connecting plate 363, which can reduce the influence of the force in the height direction of the T-shaped support structure formed by the rear drive push rod 32 and the middle support link 362, and improve the support stability of the T-shaped support structure.

[0118] Furthermore, as shown in FIG20 , the bottom link 361 includes a first segment 3611 and a second segment 3612. The front end of the first segment 3611 extends upwardly and is pivotally connected to the lower end of the main beam frame 35. The rear end of the first segment 3611 is connected to the front end of the second segment 3612, and the rear end of the second segment 3612 is fixedly connected to the rear connecting plate 363. The front connecting rod 31 is connected to the lower end of the main beam frame 35, which is connected to the front wheel 20. This makes it easy for force to be concentrated at the lower end of the main beam frame 35. The front end of the first segment 3611 extends upwardly and is pivotally connected to the lower end of the main beam frame 35. This allows a portion of the force of the main beam frame 35 to be transmitted along the first segment 3611 to the second segment 3612, thereby dispersing the force and preventing the main beam frame 35 from being broken due to concentrated force at the lower end. In one embodiment, the first rod segment 3611 and the second rod segment 3612 form an angle b, which is set at 138°-144°, and the first rod segment 3611 and the main side rod 355 form an angle c, which is set at 50°-107°.

[0119] As one embodiment, as shown in Figure 30, the bottom link 361 is provided with a connection point for connecting with the middle support link 362, and the connection point is located at 1 / 5-1 / 3 of the length of the bottom link 361 near the front end in the front-to-back direction, thereby shortening the distance between the middle support link 362 and the main beam frame 35 in the front-to-back direction, improving the concentration of the bottom support force of the electric wheelchair, and improving the bottom support stability of the electric wheelchair.

[0120] Furthermore, as shown in FIG29 , bottom connecting plates 364 are provided on both sides of the rear connecting plate 363 in the width direction. The bottom connecting plates 364 are pivotally connected to the rear connecting plate 363 in the front-to-back direction, and the side of the bottom connecting plate 364 away from the rear connecting plate 363 is connected to the rear wheel 33. The bottom connecting plates 364 are pivotally connected to the rear connecting plate 363 in the front-to-back direction, thereby increasing the range of motion of the rear wheel 33 in the height direction. Compared with the rear wheel 33 being directly connected to the rear connecting plate 363 or the bottom link 361, this prevents the rear wheel 33 from being subjected to height-direction forces when navigating obstacles, which could easily cause deformation of the rear connecting plate 363 or the bottom link 361, thereby improving the reliability of the connecting beam frame 36.

[0121] As one embodiment, as shown in Figure 29, a wheel connecting bracket 365 is provided at the upper end of the rear connecting plate 363, and the wheel connecting bracket 365 is connected to the bottom connecting plate 364 through a buffer 366 to buffer the obstacle-crossing force of the rear wheel 33, further reduce the direct collision between the bottom connecting plate 364 and the rear connecting plate 363, avoid the rear connecting plate 363 or the bottom connecting rod 361 from being easily deformed, improve the reliability of the connecting beam frame 36, and at the same time, reduce the bumpy feeling and improve the user experience.

[0122] In summary, an embodiment of the present invention provides an electric wheelchair, comprising a seat assembly 10, a front wheel 20, a rear wheel folding assembly 30, and a drive member 40, wherein a user sits on the seat assembly 10, and the seat assembly 10 carries the user. The rear wheel folding assembly 30 is used to support the seat assembly 10, and simultaneously achieve angle adjustment and height adjustment of the seat assembly 10. Specifically, the rear wheel folding assembly 30 comprises a first connecting seat 34, a front connecting rod 31, a rear driving push rod 32, a main beam frame 35, a connecting beam frame 36, and a rear wheel 33. The upper end of the front connecting rod 31 and the upper end of the main beam frame 35 are rotatably connected to the first connecting seat 34 in sequence along the front-to-back direction, the lower end of the front connecting rod 31 and the front end of the connecting beam frame 36 are rotatably connected to the lower end of the main beam frame 35, and the two ends of the rear driving push rod 32 are rotatably connected to the upper end of the main beam frame 35 and the connecting beam frame 36, respectively. When the wheelchair is moving uphill, the rear drive push rod 32 extends; when the wheelchair is moving downhill, the rear drive push rod 32 shortens, compensating the angle of the seat assembly 10 to adjust the center of gravity. This allows the seat assembly 10 to remain parallel or substantially parallel to the ground both when moving uphill and downhill, enhancing the user's comfort when using the wheelchair uphill and downhill. The front connecting rod 31 and the rear drive push rod 32 simultaneously extend, placing the user at a higher height than when sitting, making it easier to access items at height and meeting more user needs. The front connecting rod 31 and the rear drive push rod 32 simultaneously shorten, allowing the rear wheel folding assembly 30 to fold as a whole. The seat assembly 10 and the front wheel 20 are separately connected to the rear wheel folding assembly 30 to form a foldable whole, which is convenient for storage and transportation, while preventing component loss. Reuse requires no assembly, making it convenient. The bottom of the seat assembly 10 is detachably connected to the first connecting seat 34, and the lower end of the main beam frame 35 is detachably connected to the front wheel 20. When the storage space is insufficient to accommodate a folded whole, the seat assembly 10 is disassembled and separated from the first connecting seat 34, and the main beam frame 35 is disassembled and separated from the front wheel 20. The seat assembly 10, the front wheel 20, and the folded rear wheel folding assembly 30 form three major components. Each component occupies less space and weighs less, so as to meet the storage requirements of a small space and facilitate transportation. Furthermore, there is no operational sequence restriction on the assembly, disassembly, and folding sequence of the seat assembly 10, the front wheel 20, and the rear wheel folding assembly 30. The seat assembly 10 can be disassembled first and then folded, or folded first and then disassembled, or the seat assembly 10 and the rear wheel folding assembly 30 can be assembled or disassembled first, and then the rear wheel folding assembly 30 and the front wheel 20 can be assembled or disassembled, or the rear wheel folding assembly 30 and the front wheel 20 can be assembled or disassembled first, and then the seat assembly 10 and the rear wheel folding assembly 30 can be assembled or disassembled. This reduces the operational restrictions on the assembly and disassembly of the wheelchair and reduces the difficulty of the wheelchair assembly and disassembly operation.

[0123] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An electric wheelchair, characterized in that: It includes a seat assembly, a front wheel, a rear wheel folding assembly and a driving member, the rear wheel folding assembly includes a first connecting seat, a front connecting rod, a rear driving push rod, a main beam frame, a connecting beam frame and a rear wheel, the upper end of the front connecting rod and the upper end of the main beam frame are rotatably connected to the first connecting seat in sequence along the front-to-back direction, the lower end of the front connecting rod and the front end of the connecting beam frame are rotatably connected to the lower end of the main beam frame respectively, the two ends of the rear driving push rod are rotatably connected to the upper end of the main beam frame and the connecting beam frame respectively, the rear wheel is connected to the connecting beam frame, the seat assembly is detachably connected to the first connecting seat, the lower end of the main beam frame is detachably connected to the front wheel, and the driving member is at least electrically connected to the rear wheel.

2. The electric wheelchair according to claim 1, characterized in that: The seat assembly includes a seat back, a seat cushion and a seat connecting portion, the seat back is connected to the rear end of the seat cushion, the seat connecting portion is connected to one end of the seat cushion facing the first connecting seat, and the first connecting seat and the seat connecting portion are slidably installed along the front-rear direction.

3. The electric wheelchair according to claim 2, characterized in that: The first connecting seat is provided with a plug-in slot opening forward, the seat connecting part is provided with a plug-in block arranged corresponding to the position of the plug-in slot, the plug-in block is slidably installed in the plug-in slot, the front end of the seat connecting part is provided with a seat limiting part extending downward, the seat limiting part is connected to the front end of the plug-in block, the front end of the first connecting seat is provided with a locking part, the seat limiting part is located at the front end of the plug-in slot and is detachably connected to the locking part.

4. The electric wheelchair according to claim 3, characterized in that: The seat limiting portion is provided with a locking slot with an opening facing downward, and the locking portion includes a positioning rod and an eccentric locking rod. The first end of the positioning rod is rotatably connected to the first connecting seat, and the second end of the positioning rod extends out of the front end of the first connecting seat. The eccentric locking rod is rotatably connected to the second end of the positioning rod. The positioning rod is installed in the locking slot, and the peripheral side surface of the eccentric locking rod is provided with a locking surface. When the locking surface is in contact with the seat limiting portion, the seat limiting portion is confined between the locking surface and the first connecting seat.

5. The electric wheelchair according to claim 3, characterized in that: A locking extension arm is provided at the bottom of the first connecting seat, which is located below the plug-in slot and extends forward. The locking portion includes an operating push rod and a locking rod. The upper end of the operating push rod is rotatably connected to the locking extension arm. The locking rod extends along the width direction and is connected to the operating push rod. The seat limiting portion is located between the front end of the plug-in slot and the locking rod. When the operating push rod rotates backward, the outer peripheral surface of the locking rod abuts and locks with the front end of the seat limiting portion.

6. The electric wheelchair according to claim 5, characterized in that: When the operating push rod extends downward, a locking avoidance channel is formed above the locking rod, and the seat limiting portion is installed in the plug-in slot through the locking avoidance channel.

7. The electric wheelchair according to claim 5, characterized in that: The seat connecting part is provided with a seat unlocking part located at the front end of the seat locking part, the upper end of the seat unlocking part is connected to the front end of the plug-in block, the lower end of the seat unlocking part extends downward to form an unlocking end, the locking part is located between the seat locking part and the seat unlocking part along the front-to-back direction, the operating push rod rotates forward, and the operating push rod pushes the unlocking end to move forward.

8. The electric wheelchair according to claim 3, characterized in that: The plug-in slot includes two oppositely arranged slot side walls and a slot bottom surface, the slot bottom surface is respectively connected to the lower ends of the slot side walls on both sides in the width direction, the rear end width of the slot bottom surface is smaller than the front end width of the slot bottom surface, and the shape of the plug-in block is matched with the shape of the plug-in slot.

9. The electric wheelchair according to claim 8, characterized in that: The side wall of the groove is provided with a first limiting inclined surface, and the opposite sides of the plug-in block are respectively provided with second limiting inclined surfaces, and the first limiting inclined surface is fitted with the second limiting inclined surface.

10. The electric wheelchair according to claim 3, characterized in that: The plug-in slot comprises a slot end face, the slot end face is provided with a first wiring terminal, the plug-in block is provided with a second wiring terminal facing the slot end face, and the first wiring terminal is plugged and electrically connected with the second wiring terminal.

11. The electric wheelchair according to claim 10, characterized in that: The rear wheel folding assembly includes a power supply and a controller, and the power supply and the controller are electrically connected to the first terminal respectively. The seat assembly includes an operating handle, and the operating handle is electrically connected to the second terminal.

12. The electric wheelchair according to claim 1, characterized in that: A first connecting rod and a lock are provided at the lower end of the main beam frame, the front wheel includes a second connecting rod and a connecting arm extending toward the first connecting rod, the connecting arm is provided with a first connecting portion, the first connecting portion is detachably connected to the first connecting rod, and the lock is detachably connected to the first connecting rod.

13. The electric wheelchair according to claim 12, characterized in that: An assembly cavity opening downward is provided at the lower end of the main beam frame, and the first connecting rod and the lock buckle are connected to the assembly cavity.

14. The electric wheelchair according to claim 13, characterized in that: The first connecting rod is connected to the rear end of the assembly cavity, and the lock buckle is connected to the front end of the assembly cavity by rotating around the width direction. The lock buckle is a hook body structure. The lower end of the main beam frame is provided with a limiting groove opening downward, and the second connecting rod is installed in the limiting groove. When the lock buckle locks the second connecting rod, one of the side walls of the limiting groove is arranged corresponding to the position of the lock buckle in the front-to-back direction when locked. The second connecting rod is located between the bottom surface of the limiting groove and the lock buckle in the height direction, and the first connecting part is a groove body structure opening toward the rear end.

15. The electric wheelchair according to claim 2, characterized in that: The seat assembly comprises a bottom bracket, a first rod, a second rod and an armrest, the seat back is detachably connected to the bottom bracket, one end of the bottom bracket is connected to the seat cushion, the other end of the bottom bracket is provided with a first rotating part and a second rotating part, one end of the first rod is rotatably connected to the first rotating part to form a first axis, the other end of the first rod is rotatably connected to one end of the second rod to form a second axis, the other end of the second rod and the armrest are respectively rotatably connected to the seat back to form a third axis, and the seat back is rotatably connected to the second rotating part to form a fourth axis; The first axis, the second axis, the third axis and the fourth axis extend in the width direction and are arranged in parallel. The first axis, the second axis, the third axis and the fourth axis are projected on the projection surface in the width direction to form a first projection. A shadow point, a second projection point, a third projection point and a fourth projection point, wherein the first projection point, the second projection point, the third projection point and the fourth projection point are sequentially connected on the projection plane to form a quadrilateral.

16. The electric wheelchair according to claim 15, characterized in that: At least one side of the chair back is provided with a chair back connecting part, and the chair back connecting part includes a connecting column and a first limit block, the first limit block is located at the outer periphery of the connecting column, the first limit block is provided with a first matching surface of the chair back, one end of the second rod body is provided with a second limit block and a rod body ring, the second limit block is located at the edge of the rod body ring, the second limit block is provided with a first matching surface of the rod body, one end of the armrest is provided with an armrest ring and a third limit block, the third limit block is provided with a first matching surface of the armrest and a second matching surface of the armrest, and the first matching surface of the armrest and the second matching surface of the armrest are at A rotation gap is formed between the circumference, the first limit block and the second limit block are located in the rotation gap, the connecting column, the rod body ring and the armrest ring are coaxially rotatably connected, the second limit block is radially located between the armrest ring and the first limit block, the armrest includes a use state and a folded state, when the armrest is in the use state, the first mating surface of the chair back is in contact with the first mating surface of the armrest, when the armrest is in the folded state, the first mating surface of the rod body is in contact with the first mating surface of the armrest, and the first mating surface of the chair back is separated from the first mating surface of the armrest.

17. The electric wheelchair according to claim 16, characterized in that: The first limiting block is provided with a second limiting surface of the seat back, and the armrest includes a yielding state. When the armrest is in the yielding state, the second matching surface of the armrest is in contact with the second limiting surface of the seat back, and a side entry and exit channel is formed between the armrest and the side of the seat cushion.

18. The electric wheelchair according to claim 16, characterized in that: When the armrest is in use, there is a gap between the first matching surface of the rod body and the first matching surface of the armrest.

19. The electric wheelchair according to claim 1, characterized in that: The main beam frame includes a main side rod, an upper connecting rod and a lower connecting rod, the upper connecting rod and the lower connecting rod extend in the width direction respectively, the two ends of the upper connecting rod and the two ends of the lower connecting rod are respectively connected to the main side rods to form a frame structure, the two ends of the front connecting rod are respectively rotatably connected to the lower connecting rod and the front end of the first connecting seat, and the two ends of the rear driving push rod are respectively rotatably connected to the upper connecting rod and the connecting beam frame.

20. The electric wheelchair according to claim 1, characterized in that: The connecting beam frame includes a bottom connecting rod, a middle supporting connecting rod and a rear connecting plate, the bottom connecting rod extends in the front-to-back direction, the middle supporting connecting rod and the rear connecting plate are respectively connected to the bottom connecting rod on both sides in the width direction, the front end of the bottom connecting rod is rotatably connected to the lower end of the main beam frame, and the lower end of the rear driving push rod is rotatably connected to the middle supporting connecting rod.

21. The electric wheelchair according to claim 20, characterized in that: The bottom connecting rod includes a first rod segment and a second rod segment, the first rod segment extends upwardly and tilted, the upper end of the first rod segment is rotatably connected to the lower end of the main beam frame, the lower end of the first rod segment is connected to the front end of the second rod segment, and the rear end of the second rod segment is fixedly connected to the rear connecting plate.

22. The electric wheelchair according to claim 20, characterized in that: The rear connecting plate is provided with bottom connecting plates on both sides in the width direction respectively. The bottom connecting plates are connected to the rear connecting plate by rotation around the front-back direction. The side of the bottom connecting plate away from the rear connecting plate is connected to the rear wheel.

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