Electric wheelchair with lift adjustment

Abstract

The application relates to an electric wheelchair achieving lifting adjustment, which comprises a chassis frame, a seat assembly, a footrest assembly, a backrest assembly and a lifting adjustment mechanism. The lifting adjustment mechanism drives a transmission screw to rotate through a driving unit, moves a guide block along a sliding guide rail, and pushes the seat to stably lift through a connecting rod assembly; a balance air bag and a gravity center adjusting device work cooperatively, a pressure sensor is used for monitoring and adjusting the gravity center, and stability is ensured. The seat width can be adjusted through an adjusting rod, the footrest height and the backrest angle are respectively controlled through an extension rod and an adjusting motor, and individual needs are met. The application optimizes the design of the lifting mechanism, improves the stability, safety and man-machine adaptation capability, and solves the problems of unstable lifting, limited posture adjustment and insufficient safety in the prior art.

Description

Technical Field

[0001] The utility model belongs to the technical field of rehabilitation auxiliary equipment, and particularly relates to an electric wheelchair capable of realizing lifting adjustment. Background Art

[0002] With the development of electric wheelchair technology, various electric wheelchairs with lifting adjustment functions have been widely used in the daily life and rehabilitation care of the elderly and people with limited mobility. However, existing products still have problems such as complex structures, inconvenient operations, and poor adaptability when realizing the lifting adjustment function, and it is difficult to fully meet the users' requirements for comfort, safety, and autonomy.

[0003] After retrieval, an electric wheelchair with lifting and docking functions with the publication number CN108652849B was disclosed, and the publication date was March 26, 2024. This patent realizes the lifting movement of the overall seat by setting a lifting device at the exact center position of the wheelchair chassis and fixing the seat on the lifting device, and at the same time combines a docking device to complete the transfer docking with home facilities. Although this structure realizes the basic lifting function, the centralized arrangement of its lifting device at the center of the chassis results in a strong dependence on the overall structural rigidity, and it is easy to generate eccentric load or晃动 during the lifting process, affecting the running stability; in addition, this solution only realizes the overall lifting of the seat, lacks the linkage adjustment of components such as footrests and backrests, and cannot be personalized according to the user's body type or posture requirements, limiting the comfort and functionality of use.

[0004] After retrieval, an electric folding wheelchair capable of climbing up and down steps with the publication number CN112220619B was disclosed, and the publication date was February 11, 2025. This patent uses a scissor mechanical structure as the wheelchair seat lifting assembly to realize the lifting and translation of the seat, and at the same time cooperates with the function of climbing up and down steps to improve the terrain passing ability. Although this solution realizes a relatively flexible lifting and folding function, the scissor mechanism occupies a large space during the unfolding and folding process, and the ground clearance at the bottom is small in the low posture, resulting in insufficient passing ability; more importantly, this lifting structure does not form a coordinated control with the wheelchair center of gravity adjustment, and it is easy to cause the whole machine to tilt forward or backward during the lifting process, lacking a stability guarantee mechanism and having potential safety hazards, especially when used on slopes or uneven roads, the risk is higher.

[0005] The aforementioned problems indicate that current electric wheelchairs with height adjustment functions generally suffer from drawbacks such as limited functionality, poor structural stability, and insufficient ergonomics, making it difficult to simultaneously achieve smoothness, safety, and user comfort during height adjustment. Therefore, this invention provides an electric wheelchair with height adjustment capabilities, aiming to optimize the layout of the height adjustment mechanism and achieve coordinated adjustment of multiple components such as the seat, footrests, and backrest. This enhances stability and ergonomic adaptability during height adjustment, thereby solving problems such as unstable height adjustment, limited posture adjustment, and insufficient safety in existing technologies, and meeting users' higher demands for intelligent and comfortable electric wheelchairs. Utility Model Content

[0006] This utility model relates to an electric wheelchair with height adjustment, including a chassis frame, a seat assembly, a footrest assembly, a backrest assembly, and a height adjustment mechanism. The height adjustment mechanism is installed within the chassis frame and is connected to the seat assembly via a connector. Footrest assemblies are symmetrically installed on one outer wall of the seat assembly, and the backrest assembly is hinged to the other outer wall. The height adjustment mechanism includes a drive unit, sliding guide rails, a transmission screw, a guide block, a connecting rod assembly, a balance airbag, and a center of gravity adjustment device. Sliding guide rails are symmetrically arranged within the chassis frame, parallel to each other and fixed at both ends to the inner wall of the chassis frame. Guide blocks are slidably connected to the inner walls of the sliding guide rails, and threaded holes are formed on one outer wall of each guide block. The transmission screw passes through a threaded hole and forms a threaded engagement with the guide block. Both ends of the transmission screw are rotatably connected to the inner wall of the chassis frame. A first bevel gear is fixedly connected to the outer wall of one end of the transmission screw. A drive unit is embedded in the inner wall of the bottom end of the chassis frame. A second bevel gear is fixedly connected to the top of the output shaft of the drive unit. The first bevel gear and the second bevel gear mesh with each other. One end of a connecting rod assembly is hinged to the outer wall of the top end of the guide block. The other end of the connecting rod assembly is hinged to the outer wall of the bottom end of the seat assembly. Balance airbags are symmetrically installed on the inner walls of both sides of the chassis frame. An air pipe is connected to one outer wall of the balance airbag. The other end of the air pipe is connected to the air inlet of the center of gravity adjustment device. The center of gravity adjustment device is fixed to the inner wall of the chassis frame.

[0007] The chassis frame has symmetrically distributed support columns on its bottom outer wall. Shock-absorbing wheels are mounted on the bottom ends of the support columns, and bearings are positioned at the center of each shock-absorbing wheel. The inner ring of the bearing is fixedly connected to the outer wall of the support column. An elastic element is positioned between the outer ring of the shock-absorbing wheel and the outer ring of the bearing. One end of the elastic element is fixedly connected to the outer ring of the bearing, and the other end is fixedly connected to the inner wall of the shock-absorbing wheel. An operation panel slot is provided on one side of the chassis frame's outer wall. A control panel is embedded in this slot, and multiple buttons are distributed on one side of the control panel's outer wall. These buttons are used to control the drive unit, the center of gravity adjustment device, and the angle adjustment function of the backrest assembly.

[0008] The seat assembly includes a seat cushion, side panels, and an adjustment rod. Side panels are symmetrically fixed to the outer walls of both sides of the seat cushion. A groove is formed on one outer wall of each side panel, within which the adjustment rod is slidably connected. A locking element is fixed to the outer wall of one end of the adjustment rod, and a knob is provided on the outer wall of one side of the locking element. The knob is used to manually adjust the position of the adjustment rod within the groove, thereby changing the seat width to accommodate users of different body types. Hinge seats are symmetrically arranged on the bottom outer wall of the seat assembly. A through hole is formed on one outer wall of each hinge seat, and one end of a connecting rod assembly passes through the through hole via a pin and forms a hinged connection with the hinge seat.

[0009] The foot pedal assembly includes a foot pedal, a telescopic rod, and a limiting block. The telescopic rod is fixed to the top outer wall of the foot pedal. One side of the telescopic rod has graduated markings. The other end of the telescopic rod is slidably connected to the bottom outer wall of the seat assembly. A limiting hole is formed on one side of the telescopic rod, and a limiting block is inserted into the limiting hole. An anti-slip texture is provided on one side of the limiting block to fix the extension length of the telescopic rod, thereby adjusting the height of the foot pedal. The backrest assembly includes a backrest panel, an adjustment motor, and a swing arm. The swing arm is fixed to one side of the backrest panel. One end of the swing arm is hinged to one side of the seat assembly, and the other end is hinged to the top of the output shaft of the adjustment motor. The adjustment motor is fixed to one side of the seat assembly. An arc-shaped support pad is provided on the top outer wall of the backrest panel, and ventilation holes are provided on one side of the arc-shaped support pad to improve user comfort.

[0010] The center of gravity adjustment device includes an air bladder cavity, a piston rod, and a pressure sensor. An air inlet is provided on one outer wall of the air bladder cavity, and the air inlet is connected to the outer wall of the balance air bladder via an air pipe. A piston rod is slidably connected to the inner wall of the air bladder cavity. A sealing ring is fixed to the outer wall of one end of the piston rod, and the outer wall of the sealing ring is in close contact with the inner wall of the air bladder cavity. A push rod is fixed to the outer wall of the other end of the piston rod, and a slider is fixed to the outer wall of one end of the push rod. One outer wall of the slider is slidably connected to the inner wall of the chassis frame. A pressure sensor is provided on one outer wall of the slider, and one outer wall of the pressure sensor is electrically connected to the input terminal of the control panel.

[0011] An inflation valve is provided on one outer wall of the balance airbag, and an air pump is connected to one outer wall of the inflation valve. The air pump is fixed to the inner wall of the chassis frame. A solenoid valve is provided on one outer wall of the air pump, and the solenoid valve is electrically connected to the output terminal of the control panel. An inspection port is provided on one outer wall of the chassis frame, and a cover plate is hinged to one outer wall of the inspection port. A sealing strip is provided on one outer wall of the cover plate, and a magnetic adsorption element is provided on one outer wall of the sealing strip for forming a sealed connection with the outer wall of the chassis frame.

[0012] This invention features a lifting and adjusting mechanism. A drive unit rotates a transmission screw, causing a guide block to move up and down along a sliding guide rail. This, in turn, drives the seat assembly to achieve smooth lifting and lowering. The sliding guide rail effectively limits the movement trajectory of the guide block, preventing uneven loading or swaying. Simultaneously, a balance airbag and a center of gravity adjustment device work together. A pressure sensor monitors the center of gravity changes of the chassis frame in real time, and an air pump replenishes the balance airbag, ensuring the stability of the entire machine during lifting and lowering. Furthermore, the width of the seat assembly can be adjusted using an adjustment rod, the height of the footrest assembly can be adjusted using a telescopic rod, and the angle of the backrest assembly can be controlled by an adjustment motor, thus meeting the personalized needs of different users.

[0013] This utility model optimizes the layout design of the lifting mechanism through the above-mentioned technical solution, improves the stability and safety during the lifting process, and realizes the linkage adjustment of multiple components such as the seat, footrest and backrest, which significantly improves the human-machine adaptation capability and solves the problems of unstable lifting, limited posture adjustment and insufficient safety in the prior art, thus meeting users' higher demand for intelligent and comfortable electric wheelchairs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the lifting and adjusting mechanism of this utility model.

[0016] Figure 3 This is a schematic diagram of the air bladder cavity structure of this utility model.

[0017] Figure 4 This is a schematic diagram of the control panel structure of this utility model.

[0018] The attached diagram is labeled as follows: 1. Chassis frame; 2. Seat assembly; 3. Foot pedal assembly; 4. Backrest assembly; 5. Height adjustment mechanism; 6. Sliding guide rail; 7. Transmission screw; 8. Guide block; 9. Linkage assembly; 10. Balance airbag; 11. Center of gravity adjustment device; 12. Drive unit; 13. Shock absorber wheel; 14. Control panel; 15. Seat cushion; 16. Adjustment rod; 17. Foot pedal; 18. Telescopic rod; 19. Backrest panel; 20. Adjustment motor; 21. Airbag chamber; 22. Piston rod; 23. Pressure sensor. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] Specific implementation examples are given below.

[0021] This utility model relates to an electric wheelchair with adjustable height, the overall structure of which is as follows: Figure 1 As shown, the device includes a chassis frame 1, a seat assembly 2, a footrest assembly 3, a backrest assembly 4, and a height adjustment mechanism 5. The chassis frame 1 is the main supporting structure of the entire device, and the height adjustment mechanism 5 is installed inside it. The height adjustment mechanism 5 is connected to the seat assembly 2 via a connecting rod assembly 9. The footrest assembly 3 is symmetrically installed on one outer wall of the seat assembly 2, and the backrest assembly 4 is hinged to the other outer wall. Support columns are symmetrically distributed on the bottom outer wall of the chassis frame 1, and shock-absorbing wheels 13 are installed at the bottom of the support columns. An operation panel slot is provided on one outer wall of the chassis frame 1, and a control panel 14 is embedded in the operation panel slot for manual or automatic control of various functional components.

[0022] The specific structure of the lifting and adjusting mechanism 5 is as follows: Figure 2As shown, the system includes a drive unit 12, sliding guide rails 6, transmission screws 7, guide blocks 8, connecting rod assemblies 9, balance airbags 10, and a center of gravity adjustment device 11. Sliding guide rails 6 are symmetrically arranged inside the chassis frame 1, parallel to each other and fixed at both ends to the inner wall of the chassis frame 1. Guide blocks 8 are slidably connected to the inner wall of the sliding guide rails 6. A threaded hole is formed on one outer wall of the guide block 8, through which the transmission screw 7 passes and forms a threaded engagement with the guide block 8. Both ends of the transmission screw 7 are rotatably connected to the inner wall of the chassis frame 1 via bearings. A first bevel gear is fixedly connected to the outer wall of one end of the transmission screw 7. The drive unit 12 is embedded in the inner wall of the bottom end of the chassis frame 1. A second bevel gear is fixedly connected to the top of the output shaft of the drive unit 12, and the first bevel gear meshes with the second bevel gear. One end of the connecting rod assembly 9 is hinged to the outer wall of the top end of the guide block 8, and the other end of the connecting rod assembly 9 is hinged to the outer wall of the bottom end of the seat assembly 2. Balance airbags 10 are symmetrically installed on the inner walls of both sides of the chassis frame 1. An air pipe is connected to one outer wall of the balance airbag 10, and the other end of the air pipe is connected to the air inlet of the center of gravity adjustment device 11. The center of gravity adjustment device 11 is fixed to the inner wall of the chassis frame 1.

[0023] The specific structure of seat component 2 is as follows: Figure 3 As shown, the seat assembly includes a seat cushion 15, side panels, and an adjusting rod 16. Side panels are symmetrically fixed to the outer walls of both sides of the seat cushion 15. A groove is formed on one outer wall of each side panel, within which the adjusting rod 16 is slidably connected. A locking element is fixed to the outer wall of one end of the adjusting rod 16, and a knob is provided on one outer wall of the locking element. The knob is used to manually adjust the position of the adjusting rod 16 within the groove, thereby changing the seat width to accommodate users of different body types. Hinge seats are symmetrically arranged on the bottom outer wall of the seat assembly 2. A through hole is formed on one outer wall of each hinge seat, and one end of the connecting rod assembly 9 passes through the through hole via a pin and forms a hinged connection with the hinge seat.

[0024] The specific structure of pedal assembly 3 is as follows: Figure 3 As shown, the system includes a foot pedal 17, a telescopic rod 18, and a limiting block. The telescopic rod 18 is fixedly attached to the top outer wall of the foot pedal 17. One side of the outer wall of the telescopic rod 18 has graduated markings, and the other end of the telescopic rod 18 is slidably connected to the bottom outer wall of the seat assembly 2. A limiting hole is formed on one side of the outer wall of the telescopic rod 18, and a limiting block is inserted into the limiting hole. One side of the outer wall of the limiting block has anti-slip textures to fix the extension length of the telescopic rod 18, thereby adjusting the height of the foot pedal 17.

[0025] The specific structure of the center of gravity adjustment device 11 is as follows: Figure 4As shown, the system includes an airbag cavity 21, a piston rod 22, and a pressure sensor 23. An air inlet is provided on one outer wall of the airbag cavity 21, and the air inlet is connected to the outer wall of the balance airbag 10 via an air tube. The piston rod 22 is slidably connected to the inner wall of the airbag cavity 21. A sealing ring is fixed to the outer wall of one end of the piston rod 22, and the outer wall of the sealing ring is tightly fitted to the inner wall of the airbag cavity 21. A push rod is fixed to the outer wall of the other end of the piston rod 22, and a slider is fixed to the outer wall of one end of the push rod. One outer wall of the slider is slidably connected to the inner wall of the chassis frame 1. A pressure sensor 23 is disposed on one outer wall of the slider, and one outer wall of the pressure sensor 23 is electrically connected to the input terminal of the control panel 14.

[0026] The specific structure of the balance airbag 10 is as follows: Figure 1-4 As shown, an inflation valve is installed on one outer wall of the balance airbag 10. An air pump is connected to one outer wall of the inflation valve. The air pump is fixed to the inner wall of the chassis frame 1. A solenoid valve is installed on one outer wall of the air pump, and the solenoid valve is electrically connected to the output terminal of the control panel 14. An inspection port is provided on one outer wall of the chassis frame 1. A cover plate is hinged to one outer wall of the inspection port. A sealing strip is installed on one outer wall of the cover plate. A magnetic adsorption element is installed on one outer wall of the sealing strip to form a sealed connection with the outer wall of the chassis frame 1. The specific structure of the shock absorber 13 is as follows. Figure 1-4 As shown, a bearing is provided at the center of the shock absorber 13. The inner ring of the bearing is fixedly connected to the outer wall of the support column. An elastic element is provided between the outer ring of the shock absorber 13 and the outer ring of the bearing. One end of the elastic element is fixedly connected to the outer ring of the bearing, and the other end is fixedly connected to the inner wall of the shock absorber 13.

[0027] In actual use, when the seat assembly 2 needs to be raised or lowered, the user activates the drive unit 12 via the control panel 14. The output shaft of the drive unit 12 drives the second bevel gear to rotate, which meshes with the first bevel gear, thereby driving the transmission screw 7 to rotate. The rotation of the transmission screw 7 causes the guide block 8 to move up and down along the sliding guide rail 6. The movement of the guide block 8 pushes the seat assembly 2 to achieve smooth raising and lowering through the connecting rod assembly 9. The sliding guide rail 6 effectively limits the movement trajectory of the guide block 8, avoiding uneven loading or swaying. At the same time, the balance airbag 10 and the center of gravity adjustment device 11 work together. The pressure sensor 23 monitors the change in the center of gravity of the chassis frame 1 in real time and transmits the signal to the control panel 14. When a center of gravity shift is detected, the control panel 14 controls the air pump to replenish gas into the balance airbag 10 to ensure the stability of the whole machine during the raising and lowering process.

[0028] The width of seat assembly 2 can be adjusted via adjustment rod 16. After the user rotates the knob on adjustment rod 16 to release the locking mechanism, adjustment rod 16 can slide within the groove of the side panel, thereby changing the seat width to accommodate users of different body types. The height of footrest assembly 3 can be adjusted via telescopic rod 18. The user adjusts the extension length of telescopic rod 18 as needed and fixes its position via a limit block, thereby adjusting the height of footrest 17. The angle of backrest assembly 4 can be controlled via adjustment motor 20. The user starts adjustment motor 20 via control panel 14, and the output shaft of adjustment motor 20 drives the swing arm to rotate, thereby adjusting the angle of backrest 19 to meet the comfort needs of different users.

[0029] The shock-absorbing wheels 13 further enhance the driving stability of the electric wheelchair. The elastic elements effectively absorb road vibrations, reducing the impact on the user. The access panel facilitates the inspection and maintenance of components inside the chassis frame 1 by the user or maintenance personnel. The sealing strip and magnetic adsorption on the cover ensure the airtightness of the access panel, preventing dust or foreign objects from entering the chassis frame 1.

[0030] This utility model achieves smooth operation of the lifting and adjusting mechanism 5 through the above-described specific embodiments, optimizing stability and safety during the lifting process. Simultaneously, it realizes multi-component linkage adjustment of the seat assembly 2, footrest assembly 3, and backrest assembly 4, significantly improving human-machine adaptability and solving the problems of unstable lifting, limited posture adjustment, and insufficient safety in existing technologies. This meets users' higher demands for intelligent and comfortable electric wheelchairs. To better enable those skilled in the art to fully understand and implement this utility model, the following supplementary explanation of its operating principle and implementation steps is provided in conjunction with specific application scenarios.

[0031] In actual use, when the user needs to adjust the height of the electric wheelchair, they first activate the drive unit 12 via the control panel 14. The output shaft of the drive unit 12 drives the second bevel gear to rotate, and the second bevel gear meshes with the first bevel gear, thereby transmitting power to the transmission screw 7. The rotation of the transmission screw 7 causes the guide block 8 to move up and down along the sliding guide rail 6. The parallel arrangement of the sliding guide rail 6 restricts the movement trajectory of the guide block 8, ensuring that it moves only in a predetermined direction without deviation or wobbling. The movement of the guide block 8 further propels the seat assembly 2 to rise and fall smoothly via the linkage assembly 9. During this process, the design of the sliding guide rail 6 effectively avoids the phenomenon of uneven load caused by uneven load, thereby improving the stability of the lifting process.

[0032] Meanwhile, the balance airbag 10 and the center of gravity adjustment device 11 work together to ensure the stability of the entire machine during lifting and lowering. The pressure sensor 23 monitors the center of gravity changes of the chassis frame 1 in real time and transmits the signal to the control panel 14. When a center of gravity shift is detected, the control panel 14 controls the air pump to replenish gas into the balance airbag 10, causing a change in air pressure within the balance airbag 10, thereby adjusting the overall center of gravity distribution of the chassis frame 1. This dynamic adjustment mechanism effectively prevents the risk of the electric wheelchair tipping forward or backward during lifting and lowering, significantly improving safety.

[0033] Regarding the width adjustment of seat assembly 2, users can achieve a personalized fit by manually operating the adjustment lever 16. Specifically, by rotating the knob on the adjustment lever 16 and releasing the locking mechanism, the adjustment lever 16 can slide within the groove in the side panel. By changing the position of the adjustment lever 16, the width of seat assembly 2 can be adjusted to accommodate the needs of users of different body types. This design not only improves the ergonomics of the seat but also enhances user comfort.

[0034] The height adjustment of the foot pedal assembly 3 is achieved through the telescopic rod 18. Users can adjust the extension length of the telescopic rod 18 according to their needs and fix its position using a limiting block. The anti-slip textured design of the limiting block ensures that the telescopic rod 18 will not slip due to external force after locking, thus ensuring the foot pedal 17 remains at a stable height. This adjustment mechanism can meet the needs of users of different heights while avoiding fatigue or discomfort caused by an unsuitable foot pedal height.

[0035] The angle adjustment of the backrest assembly 4 is accomplished by the adjustment motor 20. The user activates the adjustment motor 20 via the control panel 14. The output shaft of the adjustment motor 20 drives the swing arm to rotate, thereby adjusting the angle of the backrest panel 19. The arc-shaped support pad and ventilation holes at the top of the backrest panel 19 further enhance user comfort, effectively relieving back pressure, especially during prolonged use. Furthermore, the flexible backrest angle adjustment function meets the needs of different users in different scenarios, such as posture adjustment during reading, resting, or traveling.

[0036] The design of the shock-absorbing wheel 13 further enhances the stability of the electric wheelchair. When the electric wheelchair travels on uneven surfaces, the elastic element inside the shock-absorbing wheel 13 absorbs road vibrations, reducing the impact on the user. One end of the elastic element is fixed to the outer ring of the bearing, and the other end is fixed to the inner wall of the shock-absorbing wheel 13. This structural design ensures maximum shock absorption while extending the service life of the shock-absorbing wheel 13.

[0037] The access port facilitates inspection and maintenance of components inside the chassis frame 1 by users or maintenance personnel. Sealing strips and magnetic adsorption components on the cover ensure the access port's airtightness, preventing dust or foreign objects from entering the chassis frame 1, thus guaranteeing the normal operation of the equipment.

[0038] In summary, this invention achieves both smoothness and safety in the height adjustment of the electric wheelchair through the specific implementation steps described above. Furthermore, the multi-component linkage adjustment significantly enhances human-machine adaptability. This design solves the problems of unstable height adjustment, limited posture adjustment, and insufficient safety in existing technologies, meeting users' higher demands for intelligent and comfortable electric wheelchairs.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An electric wheelchair with adjustable height, characterized in that, The system includes a chassis frame (1), a seat assembly (2), a foot pedal assembly (3), a backrest assembly (4), and a lifting adjustment mechanism (5). The lifting adjustment mechanism (5) is installed inside the chassis frame (1). The lifting adjustment mechanism (5) is connected to the seat assembly (2) through a connecting rod assembly (9). The foot pedal assembly (3) is symmetrically installed on one outer wall of the seat assembly (2), and the backrest assembly (4) is hinged on the other outer wall. The lifting adjustment mechanism (5) includes a drive unit (12), a sliding guide rail (6), a transmission screw (7), a guide block (8), a connecting rod assembly (9), a balance airbag (10), and a center of gravity adjustment device (11). The sliding guide rails (6) are symmetrically arranged inside the chassis frame (1). The sliding guide rails (6) are arranged in parallel and their two ends are fixed to the inner wall of the chassis frame (1). The guide block (8) is slidably connected to the inner wall of the sliding guide rail (6). A threaded hole is opened on one side of the outer wall of the guide block (8). The transmission screw (7) passes through the threaded hole and forms a threaded engagement with the guide block (8). The two ends of the transmission screw (7) are rotatably connected to the inner wall of the chassis frame (1). One end of the transmission screw (7) A first bevel gear is fixed to the outer wall. A drive unit (12) is inlaid on the inner wall of the bottom end of the chassis frame (1). A second bevel gear is fixed to the top of the output shaft of the drive unit (12). The first bevel gear and the second bevel gear are meshed together. One end of the connecting rod assembly (9) is hinged to the outer wall of the top end of the guide block (8). The other end of the connecting rod assembly (9) is hinged to the outer wall of the bottom end of the seat assembly (2). Balance airbags (10) are symmetrically installed on the inner walls of both sides of the chassis frame (1). An air pipe is connected to one side of the outer wall of the balance airbag (10). The other end of the air pipe is connected to the air inlet of the center of gravity adjustment device (11). The center of gravity adjustment device (11) is fixed to the inner wall of the chassis frame (1).

2. The electric wheelchair with height adjustment according to claim 1, characterized in that, Support columns are symmetrically distributed on the bottom outer wall of the chassis frame (1). A shock-absorbing wheel (13) is installed at the bottom of the support column. A bearing is provided at the center of the shock-absorbing wheel (13). The inner ring of the bearing is fixedly connected to the outer wall of the support column. An elastic element is provided between the outer ring of the shock-absorbing wheel (13) and the outer ring of the bearing. One end of the elastic element is fixedly connected to the outer ring of the bearing, and the other end is fixedly connected to the inner wall of the shock-absorbing wheel (13).

3. An electric wheelchair with height adjustment according to claim 1, characterized in that, An operation panel slot is provided on one side of the outer wall of the chassis frame (1). A control panel (14) is embedded in the operation panel slot. Buttons are distributed on one side of the outer wall of the control panel (14). There are multiple buttons, which are used to control the angle adjustment functions of the drive unit (12), the center of gravity adjustment device (11), and the backrest assembly (4).

4. An electric wheelchair with height adjustment according to claim 1, characterized in that, The seat assembly (2) includes a seat cushion (15), side panels, and an adjusting rod (16). Side panels are symmetrically fixed to the outer walls of both sides of the seat cushion (15). A sliding groove is provided on one side of the outer wall of the side panel. An adjusting rod (16) is slidably connected in the sliding groove. A locking member is fixed to the outer wall of one end of the adjusting rod (16). A knob is provided on one side of the outer wall of the locking member. The knob is used to manually adjust the position of the adjusting rod (16) in the sliding groove.

5. An electric wheelchair with height adjustment according to claim 1, characterized in that, The foot pedal assembly (3) includes a foot pedal (17), a telescopic rod (18), and a limiting block. The telescopic rod (18) is fixedly connected to the top outer wall of the foot pedal (17). A scale mark is provided on one side outer wall of the telescopic rod (18). The other end of the telescopic rod (18) is slidably connected to the bottom outer wall of the seat assembly (2). A limiting hole is opened on one side outer wall of the telescopic rod (18). A limiting block is inserted into the limiting hole. An anti-slip texture is provided on one side outer wall of the limiting block.

6. An electric wheelchair with height adjustment according to claim 1, characterized in that, The backrest assembly (4) includes a backrest plate (19), an adjustment motor (20), and a swing arm. The swing arm is fixed to one side of the outer wall of the backrest plate (19). One end of the swing arm is hinged to one side of the outer wall of the seat assembly (2), and the other end of the swing arm is hinged to the top of the output shaft of the adjustment motor (20). The adjustment motor (20) is fixed to one side of the outer wall of the seat assembly (2).

7. An electric wheelchair with height adjustment according to claim 1, characterized in that, The center of gravity adjustment device (11) includes an airbag cavity (21), a piston rod (22), and a pressure sensor (23). An air inlet is provided on one side of the outer wall of the airbag cavity (21). The air inlet is connected to the outer wall of the balance airbag (10) through an air pipe. The piston rod (22) is slidably connected to the inner wall of the airbag cavity (21). A sealing ring is fixedly connected to the outer wall of one end of the piston rod (22). The outer wall of the sealing ring is tightly fitted to the inner wall of the airbag cavity (21). A push rod is fixedly connected to the outer wall of the other end of the piston rod (22). A slider is fixedly connected to the outer wall of one end of the push rod. The outer wall of one side of the slider is slidably connected to the inner wall of the chassis frame (1). A pressure sensor (23) is provided on the outer wall of one side of the slider.

8. An electric wheelchair with height adjustment according to claim 1, characterized in that, An inflation valve is provided on one side of the outer wall of the balance airbag (10), and an air pump is connected to one side of the outer wall of the inflation valve. The air pump is fixed on the inner wall of the chassis frame (1). An electromagnetic valve is provided on one side of the outer wall of the air pump, and the electromagnetic valve is electrically connected to the output end of the control panel (14).

9. An electric wheelchair with height adjustment according to claim 1, characterized in that, An inspection port is provided on one side of the outer wall of the chassis frame (1). A cover plate is hinged to one side of the outer wall of the inspection port. A sealing strip is provided on one side of the outer wall of the cover plate. A magnetic adsorption element is provided on one side of the outer wall of the sealing strip.

10. An electric wheelchair with height adjustment according to claim 4, characterized in that, The seat assembly (2) has symmetrically arranged hinge seats on its bottom outer wall. A through hole is opened on one side of the outer wall of the hinge seat. One end of the connecting rod assembly (9) passes through the through hole through a pin and forms a hinge connection with the hinge seat.

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