Intelligent electric wheelchair

Abstract

The application discloses an intelligent electric wheelchair, which comprises a chair frame, characterized in that two universal wheels are arranged at the front part of the chair frame, side plates are arranged at the lower part of the chair frame, shaft holes are arranged at the ends of the side plates away from the front wheel crank rods, hollow shaft drive motors are arranged at the opposite sides of the two side plates, the hollow shaft drive motors are coaxially arranged with the shaft holes, transmission shaft sleeves are fixed to the inner walls of the output shafts of the hollow shaft drive motors, armrest frames are hingedly arranged at the two sides of the top of the chair frame, backrests are hingedly arranged at the sides of the upper part of the chair frame away from the front wheel crank rods, and positioning components for limiting the backrests are arranged on the armrest frames. When the angle of the wheelchair changes, the position of the battery box is adjusted through the electric guide rails, so that the gravity center of the wheelchair is changed, the wheelchair is effectively prevented from falling, the wheelchair is intelligent and safe, the structure is simple and reliable, and the wheelchair is not prone to damage.

Description

Technical Field

[0001] This invention relates to the field of medical assistive device technology, and in particular to an intelligent electric wheelchair. Background Technology

[0002] A wheelchair is a chair equipped with wheels that helps replace walking. They are divided into electric and manual folding wheelchairs. Wheelchairs are important mobility tools for the injured, sick, and disabled, facilitating home rehabilitation, transportation, medical visits, and outdoor activities. They not only meet the needs of people with limb disabilities and limited mobility, but more importantly, they facilitate family members' movement and care for patients, enabling patients to exercise and participate in social activities.

[0003] A typical wheelchair generally consists of a foldable frame, front and rear wheels, left and right knee pads and footrests, detachable left and right armrests, handle brakes, a seat, a backrest with a medical imaging data bag, a commode, a urine bag hook, and an electric standing mechanism. A hand-cranked wheelchair adds a hand crank to the basic design, while an electric wheelchair adds an electronic power assist system, reducing the user's physical exertion. A smart wheelchair, building upon the electric wheelchair, adds positioning and movement, standing movement, remote control movement, and related internet-based assistive living features. However, existing smart electric wheelchairs suffer from limitations due to motor limitations, resulting in cumbersome wheel disassembly and maintenance, a large folded size that hinders transport, and the inability to adjust the center of gravity in real time, making them prone to tipping over on rough roads. Therefore, this paper proposes a new type of smart electric wheelchair. Summary of the Invention

[0004] Based on the technical problems existing in the background art, the present invention proposes an intelligent electric wheelchair.

[0005] This invention proposes an intelligent electric wheelchair, comprising a chair frame, characterized in that: two universal wheels are provided at the front of the chair frame; side plates are provided on both sides of the lower part of the chair frame, and each side plate has a shaft hole at the end away from the front wheel crank; a hollow shaft drive motor is provided on the opposite side of each of the two side plates, and the hollow shaft drive motor is coaxially arranged with the shaft hole; a transmission shaft sleeve is fixed to the inner wall of the output shaft of the hollow shaft drive motor; armrests are hinged to both sides of the top of the chair frame; a backrest is hinged to the upper part of the chair frame on the side away from the front wheel crank; a positioning component for limiting the tilt angle of the backrest is provided on the armrests; drive wheel assemblies are provided on both sides of the chair frame; the drive wheel assembly includes a first groove on the side wall of the armrest and a second groove on the side wall of the side plate, the lower part of the second groove is a closed structure, and the same T-shaped insert is inserted into the second groove and the first groove. The T-shaped slider has a rectangular notch at its upper part, and a support arm is hinged within the rectangular notch. A bushing is provided at the lower end of the support arm, and a drive wheel is hinged to one end of the bushing. A transmission rod is coaxially provided on the drive wheel, and the transmission rod passes through the bushing to form a transmission engagement with the transmission bushing. A transmission assembly is provided between the transmission rod and the transmission bushing. An electric guide rail is provided at the lower part of the chair frame, and a battery box is fixed on the sliding part of the electric guide rail. A tilt angle sensor is provided inside the battery box. The electric guide rail includes a metal slide rail, and a drive motor is provided at one end of the metal slide rail. A lead screw is fixed to the output shaft of the drive motor. A sliding part is slidably arranged in the metal slide rail, and a lead screw nut is provided on the sliding part. The lead screw nut and the lead screw are engaged. The drive motor drives the lead screw to rotate, and the sliding part slides in the metal slide rail in conjunction with the lead screw nut.

[0006] As a further optimization of this technical solution, the present invention provides an intelligent electric wheelchair, wherein the positioning component includes a positioning pin disposed on the side of the backrest, and the armrest frame is provided with a plurality of positioning holes distributed in an arc shape, the positioning holes being adapted to the positioning pin.

[0007] As a further optimization of this technical solution, the present invention provides an intelligent electric wheelchair, wherein the transmission component includes two semi-circular positioning blocks disposed within a transmission shaft sleeve, and the two semi-circular positioning blocks and the transmission shaft sleeve form a positioning groove adapted to a transmission insert rod. The transmission insert rod has a through hole along its length, and an L-shaped rod is inserted into the through hole. A positioning strip is fixed to one end of the L-shaped rod. Both semi-circular positioning blocks are provided with positioning notches adapted to the positioning strip. The positioning notches and the positioning groove are distributed at right angles. A limit ring is provided at the end of the L-shaped rod away from the positioning strip.

[0008] As a further optimization of this technical solution, the present invention provides an intelligent electric wheelchair in which the drive wheel is provided with a spring groove along the axial direction, and a spring is sleeved on the outer wall of the L-shaped rod near the spring groove and the limiting ring.

[0009] In this preferred embodiment, the spring can provide a tension along the drive wheel axis, achieving a tight fit between the positioning strip and the positioning notch, resulting in greater stability.

[0010] As a further optimization of this technical solution, the present invention provides an intelligent electric wheelchair, wherein two parallel insertion holes are provided on both sides of the front part of the chair frame, and a front wheel crank is inserted into each of the two insertion holes. The side wall of the chair frame is provided with locking bolts for fixing the front wheel cranks, and the two universal wheels are respectively fixed to the ends of the two front wheel cranks away from the chair frame.

[0011] As a further optimization of this technical solution, the present invention provides an intelligent electric wheelchair, wherein the tilt angle sensor is connected to a microprocessor, and the microprocessor is electrically connected to the electric guide rail, and a lead-acid battery is provided in the battery box.

[0012] As a further optimization of this technical solution, the present invention provides an intelligent electric wheelchair in which the lead-acid battery is connected to a switch, and the switch is electrically connected to a hollow shaft drive motor.

[0013] As a further optimization of this technical solution, the present invention provides an intelligent electric wheelchair in which the first groove and the second groove are both vertically arranged, and the first groove and the second groove are located above the shaft hole.

[0014] As a further optimization of this technical solution, the present invention provides an intelligent electric wheelchair in which both the second groove and the first groove are provided with T-shaped slides adapted to the T-shaped slider.

[0015] In summary, the beneficial effects of this invention are as follows:

[0016] 1. This invention provides an intelligent electric wheelchair. Through the setting of an electric guide rail, in conjunction with a tilt angle sensor, the position of the battery box is adjusted through the electric guide rail when the angle of the wheelchair changes, thereby changing the center of gravity of the wheelchair and effectively preventing the wheelchair from tipping over, making it intelligent and safe.

[0017] 2. This invention provides an intelligent electric wheelchair. Through the positioning component, the tilt angle of the backrest can be easily adjusted, facilitating the adjustment of the sitting posture. The backrest is positioned through the armrest frame. The structure is simple, reliable, and not easily damaged. At the same time, with the T-shaped slider, the first groove and the second groove, the drive wheel can be detached, which facilitates the repair and maintenance of the drive wheel. It also reduces the storage volume of the wheelchair during transfer and transportation, making it more convenient to move. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of an intelligent electric wheelchair proposed in this invention;

[0019] Figure 2This is a schematic diagram of the structure of an intelligent electric wheelchair armrest proposed in this invention;

[0020] Figure 3 This is a schematic diagram of the structure of an intelligent electric wheelchair frame proposed in this invention;

[0021] Figure 4 This is a schematic diagram of the structure of a drive wheel for an intelligent electric wheelchair proposed in this invention;

[0022] Figure 5 This is a schematic diagram of the structure of a smart electric wheelchair transmission shaft sleeve proposed in this invention;

[0023] Figure 6 This is a schematic diagram of the structure of an L-shaped pole for an intelligent electric wheelchair proposed in this invention;

[0024] Figure 7 This is a schematic diagram of the lower part of an intelligent electric wheelchair proposed in this invention;

[0025] Figure 8 This is a schematic diagram of the structure of a T-shaped slider and support arm for an intelligent electric wheelchair proposed in this invention.

[0026] In the diagram: 1. Chair frame; 2. Drive wheel; 3. Caster wheel; 4. Front wheel crank; 5. Side panel; 6. Armrest frame; 7. Backrest; 8. Positioning pin; 9. First groove; 10. Positioning hole; 11. Second groove; 12. Shaft hole; 13. Battery box; 14. Drive shaft sleeve; 15. Positioning strip; 16. Drive rod; 17. L-shaped rod; 18. Positioning notch; 19. Positioning slot; 20. Electric guide rail; 21. Limiting ring; 22. Spring; 23. T-shaped slider; 24. Support arm; 25. Bushing. Detailed Implementation

[0027] The following will refer to the appendices in the embodiments of the present invention. Figures 1-8 The technical solutions in the embodiments of the present invention are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] Reference Figure 1-8A smart electric wheelchair includes a frame 1. Two casters 3 are provided at the front of the frame 1. Two parallel insertion holes are provided on both sides of the front of the frame 1, and each insertion hole houses a front wheel crank 4. Locking bolts for fixing the front wheel crank 4 are provided on the side wall of the frame 1. The two casters 3 are respectively fixed to the ends of the two front wheel cranks 4 away from the frame 1. Side plates 5 are provided on both sides of the lower part of the frame 1, and shaft holes 12 are provided on the ends of the two side plates 5 away from the front wheel cranks 4. Hollow shaft drive motors are provided on opposite sides of the two side plates 5, and the hollow shaft drive motors are coaxially arranged with the shaft holes 12. A transmission shaft sleeve 14 is fixed to the inner wall of the output shaft of the hollow shaft drive motor. Armrests 6 are hinged to both sides of the top of the frame 1. A backrest 7 is hinged to the upper part of the frame 1 on the side away from the front wheel cranks 4. Both sides of the frame 1 are provided with drive wheel assemblies. The drive wheel assembly includes a first groove 9 provided on the side wall of the handrail frame 6, and a second groove 11 provided on the side wall of the side plate 5. The first groove 9 and the second groove 11 are both vertically arranged, and the first groove 9 and the second groove 11 are located above the shaft hole 12. The lower part of the second groove 11 is a closed structure, and the same T-shaped slider 23 is inserted into the second groove 11 and the first groove 9. The upper part of the T-shaped slider 23 is provided with a rectangular notch, and a support arm 24 is hinged in the rectangular notch. The lower end of the support arm 24 is provided with a bushing 25. One end of the bushing 25 is hinged to a drive wheel 2. The drive wheel 2 is coaxially provided with a transmission rod 16. The transmission rod 16 passes through the bushing 25 and forms a transmission engagement with the transmission bushing 14. A transmission assembly is provided between the transmission rod 16 and the transmission bushing 14.

[0029] See attached document Figure 4 , 5 and Figure 6 The transmission assembly includes two semi-circular positioning blocks disposed within the transmission shaft sleeve 14, and the two semi-circular positioning blocks and the transmission shaft sleeve 14 form a positioning groove 19 adapted to the transmission rod 16. The transmission rod 16 has a through hole along its length, and an L-shaped rod 17 is inserted into the through hole. A positioning strip 15 is fixed to one end of the L-shaped rod 17. Each of the two semi-circular positioning blocks is provided with a positioning notch 18 adapted to the positioning strip 15. The positioning notch 18 is distributed at a right angle to the positioning groove 19. A limit ring 21 is provided at the end of the L-shaped rod 17 away from the positioning strip 15. The drive wheel 2 is provided with a spring groove along its axial direction, and a spring 22 is sleeved on the outer wall of the L-shaped rod 17 near the spring groove and the limit ring 21. The spring 22 can provide a tension along the axial direction of the drive wheel 2, so as to achieve a tight fit between the positioning strip 15 and the positioning notch 18, and make it more stable.

[0030] See attached document Figure 8The chair frame 1 has an electric guide rail 20 at its lower part, and a battery box 13 is fixed on the sliding part of the electric guide rail 20. A tilt angle sensor is installed inside the battery box 13. The tilt angle sensor is connected to a microprocessor, and the microprocessor is electrically connected to the electric guide rail 20. A lead-acid battery is installed inside the battery box 13. The lead-acid battery is connected to a switch, and the switch is electrically connected to a hollow shaft drive motor. The electric guide rail includes a metal slide rail, and a drive motor is installed at one end of the metal slide rail. A lead screw is fixed to the output shaft of the drive motor. A sliding part is slidably arranged in the metal slide rail, and a lead screw nut is installed on the sliding part. The lead screw nut and the lead screw are engaged. By driving the lead screw to rotate through the drive motor, the sliding part can slide in the metal slide rail in conjunction with the lead screw nut.

[0031] See attached document Figure 1 The armrest frame 6 is provided with a positioning component for limiting the tilt angle of the backrest 7. The positioning component includes a positioning pin 8 provided on the side of the backrest 7. The armrest frame 6 is provided with a plurality of positioning holes 10 distributed in an arc shape. The positioning holes 10 are adapted to the positioning pin 8.

[0032] Working principle: During operation, the battery box 13 located at the bottom of the chair frame 1 can be adjusted in position via the electric guide rail 20, thereby adjusting the center of gravity of the wheelchair and preventing it from tipping over. A tilt angle sensor actively provides feedback on the tilt status of the wheelchair, and a microprocessor controls the electric guide rail 20 to adjust the position of the battery box 13, thus adjusting the weight distribution of the wheelchair. This makes the system more intelligent. Removing the locking bolts on the chair frame 1 allows the front wheel crank 4 to be removed. By pressing and rotating the L-shaped rod 17, the positioning strip 15 and the positioning notch 18 are separated. Then, the positioning strip 15 and the positioning slot 19 are aligned. By rotating the support arm 24, the transmission rod 16 and the transmission shaft sleeve 14 are separated. Then, the T-shaped slider 23 is moved upwards, separating the T-shaped slider 23 from the second groove 11 and the first groove 9, thus enabling the drive wheel 2... The wheelchair can be quickly disassembled and assembled. The armrest frame 6 can be rotated, and the backrest 7 and armrest frame 6 can be rotated to achieve folding, reducing the storage volume of the wheelchair. The easily detachable drive wheels 2 facilitate maintenance and replacement. The operation is simple. During assembly, the armrest frame 6 is rotated to a vertical position, and the positioning pin 8 on the backrest 7 is inserted into the appropriate positioning hole 10 to limit the angle of the backrest 7. Then, the T-shaped slider 23 is inserted into the first groove 9, and part of the T-shaped slider 23 is inserted into the second groove 11 to limit the movement of the armrest frame 6. Then, the support arm 24 is rotated, and the transmission rod 16 is inserted into the positioning slot 19. By pressing and rotating the L-shaped rod 17, the positioning strip 15 is inserted into the positioning notch 18, achieving the transmission engagement between the drive wheel 2 and the transmission shaft sleeve 14.

[0033] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0034] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0035] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0036] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An intelligent electrically powered wheelchair comprising a chair frame (1), characterized in that: The chair frame (1) is provided with two universal wheels (3) at the front. The chair frame (1) is provided with side plates (5) on both sides of the lower part. The two side plates (5) are provided with shaft holes (12) at the ends away from the front wheel crank (4). The two side plates (5) are provided with hollow shaft drive motors on opposite sides. The hollow shaft drive motors are coaxial with the shaft holes (12). The inner wall of the output shaft of the hollow shaft drive motor is fixed with a transmission shaft sleeve (14). The chair frame (1) is provided with armrests (6) on both sides of the top. The chair frame (1) is provided with a backrest (7) on the upper side away from the front wheel crank (4). The armrests (6) are provided with positioning components for limiting the tilt angle of the backrest (7). The chair frame (1) is provided with drive wheel assemblies on both sides. The drive wheel assembly includes a first groove (9) on the side wall of the handrail (6), and a second groove (11) on the side wall of the side plate (5). The lower part of the second groove (11) is a closed structure, and the same T-shaped slider (23) is inserted into the second groove (11) and the first groove (9). The upper part of the T-shaped slider (23) is provided with a rectangular notch, and a support arm (24) is hinged in the rectangular notch. The lower end of the support arm (24) is provided with a bushing (25). 5) One end is hinged to a drive wheel (2), and the drive wheel (2) is coaxially provided with a transmission rod (16). The transmission rod (16) passes through the bushing (25) and forms a transmission engagement with the transmission bushing (14). A transmission assembly is provided between the transmission rod (16) and the transmission bushing (14). An electric guide rail (20) is provided at the lower part of the chair frame (1), and a battery box (13) is fixed on the sliding part of the electric guide rail (20). A tilt angle sensor is provided inside the battery box (13).

2. The intelligent electric wheelchair according to claim 1, characterized in that, The positioning component includes a positioning pin (8) on the side of the backrest (7), and a plurality of positioning holes (10) arranged in an arc shape on the armrest frame (6), the positioning holes (10) being adapted to the positioning pin (8).

3. The intelligent electric wheelchair according to claim 2, wherein, The transmission assembly includes two semi-circular positioning blocks disposed inside the transmission shaft sleeve (14), and the two semi-circular positioning blocks and the transmission shaft sleeve (14) form a positioning groove (19) adapted to the transmission insert rod (16). The transmission insert rod (16) is provided with a through hole along its length, and an L-shaped rod (17) is inserted into the through hole. One end of the L-shaped rod (17) is fixed with a positioning strip (15). Both semi-circular positioning blocks are provided with positioning notches (18) adapted to the positioning strip (15). The positioning notches (18) and the positioning groove (19) are distributed at right angles. A limit ring (21) is provided at the end of the L-shaped rod (17) away from the positioning strip (15).

4. The intelligent electric wheelchair according to claim 3, wherein, The drive wheel (2) is provided with a spring groove along the axial direction, and a spring (22) is sleeved on the outer wall of the L-shaped rod (17) between the spring groove and the limiting ring (21).

5. The intelligent electric wheelchair according to claim 4, wherein, The chair frame (1) has two parallel insertion holes on the front two sides, and a front wheel crank (4) is inserted into each of the two insertion holes. The side wall of the chair frame (1) is provided with locking bolts for fixing the front wheel crank (4). The two universal wheels (3) are respectively fixed to the two front wheel cranks (4) at the ends away from the chair frame (1).

6. The intelligent electric wheelchair according to claim 5, characterized in that, The tilt angle sensor is connected to a microprocessor, and the microprocessor is electrically connected to the electric guide rail (20). A lead-acid battery is installed inside the battery box (13).

7. The intelligent electric wheelchair of claim 6, wherein, The lead-acid battery is connected to a switch, and the switch is electrically connected to the hollow shaft drive motor.

8. The intelligent electric wheelchair of claim 7, wherein, The first groove (9) and the second groove (11) are both vertically arranged, and the first groove (9) and the second groove (11) are located above the shaft hole (12).

9. The intelligent electric wheelchair of claim 8, wherein, Both the second groove (11) and the first groove (9) are provided with T-shaped slides that are compatible with the T-shaped slider (23).

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