Wheelchair brake device and wheelchair using same

Abstract

The invention belongs to the technical field of wheelchairs, and discloses a wheelchair brake device which comprises a brake handle, a positioning ring piece, a movable ring piece, a power component and a switch component arranged on the brake handle. The positioning ring piece is coaxially installed on the side face of a hub of a wheel, a plurality of first protruding blocks are arranged on the outer wall of the positioning ring piece, and a positioning groove is formed between every two adjacent first protruding blocks. The movable ring piece can be close to or away from the positioning ring piece in the axis direction of the positioning ring piece, a plurality of second protruding blocks capable of being clamped into the positioning grooves are arranged on the outer wall of the movable ring piece in the circumferential direction, and limiting grooves allowing the first protruding blocks to be clamped into are formed between the adjacent second protruding blocks. The power part has an opening state and a closing state, and the switch part is used for controlling the power part to be switched between the opening state and the closing state. The wheelchair brake device has a double-brake effect, is suitable for the old and the weak to control, and is not prone to brake failure. The invention correspondingly provides a wheelchair applying the brake device.

Description

Technical Field

[0001] The present invention belongs to the technical field of wheelchairs, and in particular relates to a wheelchair brake device and a wheelchair using the device. Background Art

[0002] Wheelchair brake devices are mostly manual brake devices, and are usually fully mechanical in structure. They need to be manually controlled and use friction braking to limit the rolling of the wheels, thereby "braking". For example, the related technology CN221130229U discloses a brake system for wheelchairs for the disabled, including a brake wheel, a brake handle, and a mechanical transmission component for linking the brake handle and the brake wheel. When braking, the user needs to apply sufficient force to the brake handle, pull or toggle the brake handle, and then drive the brake wheel to press against the outer edge of the wheel through the mechanical transmission component, and use the brake wheel to abut against the wheel of the wheelchair to achieve braking.

[0003] However, this braking method is somewhat difficult for elderly and frail wheelchair users. Elderly and frail people tend to react slowly and have less strength due to their physical weakness. In an emergency, they may fail to apply sufficient force to the wheels due to slow reaction or insufficient force, resulting in unsuccessful braking. For example, the wheelchair may not stop, or the brakes may not stop properly, causing the wheelchair to continue moving. Summary of the invention

[0004] The purpose of the present invention is to provide a wheelchair brake device suitable for operation by the elderly and infirm and a wheelchair using the device.

[0005] In a first aspect, the present invention provides a wheelchair brake device, and the specific technical solution provided is as follows:

[0006] A wheelchair brake device comprises a blocking member rotatably mounted on a frame for abutting against and blocking a wheel, a brake handle rotatably mounted on the frame, and a mechanical transmission assembly for linking the blocking member and the brake handle, and further comprises:

[0007] A positioning ring, the positioning ring is coaxially mounted on the side of the wheel hub, and a plurality of first protrusions are arranged at equal intervals on the inner circumferential side wall of the positioning ring along the circumferential direction, and positioning grooves are formed between adjacent first protrusions;

[0008] A movable ring, which is mounted on the vehicle frame and can only move closer to or farther from the positioning ring along the axis direction of the positioning ring; a plurality of second protrusions that can be inserted into the positioning grooves are arranged at equal intervals along the circumferential direction on the outer circumferential side wall of the movable ring, and a limiting groove for the first protrusion to be inserted is formed between adjacent second protrusions;

[0009] A power component, the power component is used to provide push-pull power to drive the movable ring to approach or move away from the positioning ring; the power component has an open state and a closed state, when the power component is in the open state, the movable ring moves in a direction approaching the positioning ring, and when the power component is in the closed state, the movable ring moves in a direction away from the positioning ring;

[0010] And a switch component installed on the brake handle, the switch component is used to control the power component to switch between an on state and a off state.

[0011] By adopting the above technical solution, on the basis of the conventional manual mechanical brake structure, a positioning ring and a movable ring that can cooperate with each other are added. When the movable ring moves to the inner side of the positioning ring, the first protrusion is inserted into the limit groove, and the second protrusion is inserted into the positioning groove, and they are staggered and embedded with each other, thereby limiting the rotation of the wheel hub, and cooperating with the blocking member to play a cooperative braking role. Under this double braking effect, the problem of brake failure is not easy to occur. On the other hand, the switch component that controls the power component is directly set on the brake handle, so that when the brake handle is pulled, the power component controlled by the switch component can be used to switch the working state. Specifically, the switch component can use a button switch. Compared with the brake handle that needs to be pulled, it is simpler and more labor-saving for the elderly and weak to operate the button switch component. Therefore, in an emergency, braking can be achieved more labor-saving and faster, effectively reducing the occurrence of brake failure.

[0012] Without special instructions, the movable ring in the present invention can only approach or move away from the positioning ring along the axial direction of the positioning ring, which means that the movable ring can only approach or move away from the positioning ring in the axial direction, and cannot rotate circumferentially compared to its own central axis.

[0013] Furthermore, the first protrusion is provided with a first guide block at the end facing the movable ring, and the second protrusion is provided with a second guide block at the end facing the positioning ring. When the movable ring is inserted into the positioning ring, the first guide block and the second guide block use the guiding inclined surface / arc surface to produce a deflection component force, which can drive the movable ring and the positioning ring to rotate relative to each other in the circumferential direction, which is conducive to the first protrusion being smoothly inserted into the limiting groove and the second protrusion being smoothly inserted into the positioning groove, which can effectively stop the moving wheelchair and reduce the brake jamming feeling.

[0014] Furthermore, the first guide block and / or the second guide block is triangular, arched or semicircular, and can generate an oblique force component to drive the two to rotate relative to each other when the first guide block and the second guide block are in contact and relatively close.

[0015] Furthermore, the thickness of the second protrusion gradually decreases toward the positioning ring, increasing the gap between the end of the movable ring and the inner wall of the positioning ring, facilitating the movable ring to smoothly snap into the positioning ring, and reducing the sense of jamming when braking a moving wheelchair.

[0016] Furthermore, the power component includes a plurality of linear driving members that can generate thrust controlled by the switch member, and a plurality of elastic reset members for driving the movable ring member to reset; the linear driving members and the elastic reset members are evenly spaced along the circumference of the movable ring member. When the linear driving member generates thrust, the movable ring member is clamped into the positioning ring member, and the reset elastic member is stretched during this process, stopping the wheelchair; conversely, the elastic reset member recovers its deformation, pulling the movable ring member away from the positioning ring member, and the wheelchair can continue to move.

[0017] Furthermore, it also includes a cylindrical mounting cover arranged on the frame, and an end plate is provided at one end of the mounting cover away from the positioning ring; the movable ring is coaxially arranged in the mounting cover; and a guiding mechanism is provided between the mounting cover and the movable ring.

[0018] Furthermore, the guide mechanism includes a guide block provided on the movable ring, and a strip guide groove provided along the inner wall of the mounting cover for the guide block to be inserted into; the strip guide groove is provided along the axial direction of the movable ring. The movable ring can move smoothly along the axial direction through the cooperation between the guide block and the strip guide groove.

[0019] Furthermore, the linear drive is arranged on the end plate along the axial direction of the movable ring, and its movable end passes through the end plate and is connected to the movable ring; the elastic reset member is arranged between the end plate and the movable ring. This linear drive installation method is suitable for the situation where there is a large installation space between the wheel and the frame body, and the linear drive and other auxiliary components can be installed without affecting the normal use function of the wheelchair.

[0020] Furthermore, the linear drive is arranged on the outer wall of the mounting cover along the axial direction perpendicular to the movable ring, and its movable end penetrates the mounting cover and is inserted into the inner cavity of the mounting cover, and a wedge block is arranged at the end; the end surface of the movable ring is provided with a wedge groove for the wedge block to be inserted into, and the depth of the wedge groove gradually increases along the radial direction of the movable ring toward the periphery of the movable ring. This linear drive installation method is suitable for the situation where there is a small installation space between the wheel and the frame body, and the linear drive and other auxiliary components can be installed without affecting the normal use function of the wheelchair.

[0021] Furthermore, a sliding groove for the wedge block to slide is radially opened on the end plate, and the provision of the sliding groove improves the movement stability of the wedge block.

[0022] Furthermore, a guide rod is provided on the end face of the movable ring, and the guide rod extends through the end plate away from the movable ring and has an anti-slip block at the end; the elastic reset member includes a reset spring sleeved on the guide rod and located between the anti-slip block and the end plate.

[0023] Furthermore, the switch component includes a switch button installed at the end of the brake handle. The wire used to connect the switch button and the power component can be set in close contact with the vehicle body, or set in a hollow pipe on the vehicle body, and a certain margin is set at a necessary position to ensure that the wire will not be pulled and torn when the brake handle is pulled / moved.

[0024] Furthermore, a secondary positioning ring with an outer diameter smaller than the inner diameter of the movable ring is coaxially fixedly arranged inside the positioning ring, and a gap is formed between the secondary positioning ring and the positioning ring for the movable ring to be inserted into; the secondary positioning ring is provided with a guide portion at one end facing the movable ring; the secondary positioning ring has a width greater than the width of the positioning ring, and the side of the secondary positioning ring facing away from the movable ring is flush with the side of the positioning ring facing away from the movable ring. When the movable ring approaches the positioning ring, the secondary positioning ring is first inserted into the movable ring to achieve preliminary positioning; the movable ring continues to move and is inserted into the positioning ring until the movable ring and the positioning ring are locked with each other; this method can reduce the sense of jamming when the wheelchair is stopped.

[0025] In a second aspect, the present invention provides a wheelchair, which uses a wheelchair brake device as described in any one of the above items.

[0026] Furthermore, the wheelchair comprises a frame and wheels, the frame comprises a mounting shaft which sequentially passes through the movable ring and the positioning ring, and the wheels are rotatably mounted on the end of the mounting shaft.

[0027] Furthermore, the blocking member is an L-shaped limit stopper, the end of which is rotatably mounted on the frame through a pin; the top of the brake handle is operated by the operator, and the bottom is rotatably mounted on the frame through a pin; the mechanical transmission assembly includes a connecting rod, one end of which is rotatably connected to the brake handle through a pin, and the other end is rotatably connected to the L-shaped limit stopper through a pin. When the brake handle is pulled / moved, the L-shaped limit stopper rotates to the end to abut against the outer edge of the wheel under the transmission of the connecting rod, thereby limiting the rotation of the wheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the structure of the wheelchair brake device in Example 1 (in application state);

[0029] Figure 2 for Figure 1 A magnified view of part A;

[0030] Figure 3 is a (partial) cross-sectional view of the wheelchair brake device in Example 1;

[0031] Figure 4 is an exploded view of the wheelchair brake device in Example 1;

[0032] Figure 5 is a schematic structural diagram of the positioning ring in Example 1;

[0033] Figure 6 It is a schematic diagram of the structure of the movable ring in Example 1;

[0034] Figure 7 This is a schematic diagram of the structure of the installation cover and the movable ring in Example 2;

[0035] Figure 8 is a (partial) cross-sectional view of the wheelchair brake device in Example 2;

[0036] Fig. 9 is a (partial) cross-sectional view of the wheelchair brake device in Example 3;

[0037] Fig.10 is a schematic structural diagram of a positioning ring in Example 3;

[0038] Fig.11 It is a structural schematic diagram of a wheelchair in an application example;

[0039] Fig.12 for Fig.11 A magnified view of part B;

[0040] Fig.13 This is a working condition diagram of the wheelchair brake device in the application example.

[0041] Description of reference numerals:

[0042] 1. Positioning ring; 11. First protrusion; 111. First guide block; 12. Positioning groove; 13. Secondary positioning ring; 131. Guide part; 14. Connecting pipe; 15. Connecting plate; 16. Reinforcing rib; 2. Movable ring; 21. Second protrusion; 211. Second guide block; 22. Limiting groove; 23. First ring body; 24. Second ring body; 241. Guide block; 242. Wedge-shaped groove; 243. Guide rod; 2431. Anti-slip block; 3. Linear drive member; 31. Wedge-shaped block; 4. Elastic reset member; 5. Switch button; 6. Mounting cover; 61. End plate; 611. Slide groove; 62. Strip guide groove; 7. Frame; 71. Mounting shaft; 72. L-shaped limiting lever; 73. Brake handle; 74. Connecting rod; 8. Wheel; 81. Wheel hub; 82. Wheel body; 83. Spoke. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0044] [Example 1]

[0045] A wheelchair brake device, referring to Figure 1 and Figure 2, including a first brake unit and a second brake unit, which work together to brake, can improve the timeliness and reliability of stopping the wheelchair, and are suitable for use by the elderly and the infirm. Among them, the first brake unit includes a brake handle 73 rotatably mounted on the frame 7 through a pin, an L-shaped limit stopper 72 rotatably mounted on the frame 7 through a pin, and a connecting rod 74. One end of the connecting rod 74 is rotatably connected to the brake handle 73 through a pin, and the other end is rotatably connected to the L-shaped limit stopper 72 through a pin. When the wheelchair needs to be stopped, the end of the brake handle 73 is pulled, and the L-shaped limit stopper 72 is driven to rotate by the transmission of the connecting rod 74, until the end of the L-shaped limit stopper 72 abuts against the outer edge of the wheel 8 to limit the rolling of the wheel 8, thereby achieving braking.

[0046] Reference Figure 1 , Figure 2 and Figure 3 The second brake unit includes a positioning ring 1, a movable ring 2, a power component and a switch component. Among them, the positioning ring 1 and the movable ring 2 are both sleeved on the frame 7 for mounting the mounting shaft 71 for mounting the wheel hub 81, and are both located on the inner side of the wheel hub 81. The positioning ring 1 and the wheel hub 81 are coaxially fixedly arranged by bolt connection, welding and other known methods, and the positioning ring 1 can rotate with the rotation of the wheel 8. The movable ring 2 is movably sleeved on the mounting shaft 71, and can approach or move away from the positioning ring 1 along the axial direction of the mounting shaft 71. A hollow cylindrical mounting cover 6 is provided on the outer cover of the movable ring 2, and an annular end plate 61 is provided at the end of the mounting cover 6 away from the positioning ring 1. The outer edge of the end plate 61 is fixedly connected to the movable ring 2, and the inner edge is fixedly connected to the mounting shaft 71. A guide mechanism is provided between the mounting cover 6 and the movable ring 2, so that the movable ring 2 can only approach or move away from the positioning ring 1 along the axial direction of the positioning ring 1.

[0047] Reference Figure 3 , Figure 4 and Figure 5 A connecting plate 15 is fixedly provided at one end of the positioning ring 1 away from the movable ring 2, and a connecting tube 14 with a diameter smaller than the outer diameter of the positioning ring 1 is fixedly provided on the connecting plate 15. The positioning ring 1, the connecting plate 15 and the connecting tube 14 are fixedly connected to form a whole, and the mounting shaft 71 passes through the positioning ring 1, the connecting plate 15 and the connecting tube 14 in sequence. The end of the connecting tube 14 is used to be fixedly connected to the wheel hub 81, so that the positioning ring 1, the connecting plate 15 and the connecting tube 14 can rotate synchronously with the wheel hub 81 with the mounting shaft 71 as the rotating shaft. A plurality of triangular reinforcing ribs 16 are also provided between the connecting tube 14 and the connecting plate 15, and the plurality of reinforcing ribs 16 are evenly spaced along the circumference of the connecting tube 14.

[0048] Reference Figure 3 , Figure 4 and Figure 5, a plurality of first protrusions 11 are arranged at equal intervals in the circumferential direction on the inner circumferential side wall of the positioning ring 1, and the first protrusions 11 are arranged along the axial direction of the positioning ring 1, and positioning grooves 12 are formed between adjacent first protrusions 11. The movable ring 2 includes an integrally formed first ring body 23 and a second ring body 24, the outer diameter of the first ring body 23 is equal to the inner diameter of the positioning ring body, and the outer diameter of the second ring body 24 is greater than the outer diameter of the first ring body 23 and equal to the inner diameter of the mounting cover 6. A plurality of second protrusions 21 are arranged at equal intervals in the circumferential direction on the outer circumferential side wall of the first ring body 23, and limiting grooves 22 are formed between adjacent second protrusions 21. The setting direction of the second protrusions 21 is parallel to the setting direction of the first protrusions 11. The positioning grooves 12 between the first protrusions 11 are used for the second protrusions 21 to be inserted, and the limiting grooves 22 between the second protrusions 21 are used for the first protrusions 11 to be inserted. The movable ring 2 moves toward the positioning ring 1 until the first protrusion 11 and the second protrusion 21 are interlaced and engaged with each other, so that the relative position of the wheel hub 81 and the mounting shaft 71 can be locked to achieve a braking effect.

[0049] Reference Figure 4 and Figure 5 , Figure 6 In order to reduce the sense of jamming during braking, a first guide block 111 is provided at one end of the first protrusion 11 facing the movable ring 2, and a second guide block 211 is provided at one end of the second protrusion 21 facing the positioning ring 1. The first guide block 111 and the second guide block 211 can be triangular, arched or semicircular. In this embodiment, the first guide block 111 and the second guide block 211 are both arched, so that the positioning groove 12 and the limit groove 22 are in a trumpet shape with a wider opening. When the movable ring 2 is inserted into the positioning ring 1, the arcuate surfaces of the first protrusion 11 and the second protrusion 21 abut against each other. When the two are close to each other in the axial direction, a deflection component force is generated on the arcuate surface. The circumferential deflection component force can drive the movable ring 2 and the positioning ring 1 to rotate relative to each other in the circumferential direction, so that the two can be smoothly inserted, and thus the moving wheelchair can be smoothly stopped. In addition, the thickness of the second protrusion 21 gradually decreases toward the positioning ring 1, further increasing the smoothness of the movable ring 2 inserting into the positioning ring 1.

[0050] Reference Figure 3 and Figure 4The power component includes a plurality of linear drive members 3 arranged on the mounting cover 6 and an elastic reset member 4 for driving the movable ring member 2 to retreat. The linear drive members 3 can be cylinders, hydraulic cylinders or linear motors. In this embodiment, the linear drive members 3 are all cylinders, and three groups are arranged at intervals along the circumference of the mounting cover 6. The linear drive members 3 are arranged along the radial direction of the mounting cover 6, and their free ends penetrate the mounting cover 6 and are fixedly connected to a wedge block 31 at the end. The inclined surface of the wedge block 31 faces the second ring body 24 of the movable ring member 2, and a wedge groove 242 is provided on the second ring body 24 for the wedge block 31 to be inserted into, and the depth of the wedge groove 242 gradually increases from the center of the second ring body 24 to the outer edge. A slide groove 611 is provided radially on the end plate 61 for the wedge block 31 to be inserted into. The power component has an open state and a closed state. When the moving linear drive member 3 generates thrust, the wedge block 31 moves toward the central axis of the second ring body 24 under the cooperation of the slide groove 611 and the wedge groove 242, thereby pushing the movable ring member 2 to move in the circumferential direction and move toward the positioning ring member 1. On the contrary, when the power component is in the closed state, the movable ring member 2 moves away from the positioning ring member 1; in other embodiments, the linear drive member 3 can also be set to provide a pulling force to drive the movable ring member 2 to retreat.

[0051] Reference Figure 3 and Figure 4 , the reverse movement of the movable ring 2 is completed with the cooperation of the elastic reset member 4. The elastic reset member 4 is also provided with three groups at circumferential intervals around the mounting shaft 71. In this embodiment, the elastic reset member 4 is selected as a compression spring. A guide rod 243 is provided on the end face of the second ring body 24. The end of the guide rod 243 away from the second ring body 24 extends to penetrate the end plate 61 and is provided with a circular anti-slip block 2431 at the end. The compression spring is sleeved on the guide rod 243 and is located between the anti-slip block 2431 and the end plate 61. When the movable ring 2 approaches the positioning ring 1, the guide rod 243 and the anti-slip block 2431 move accordingly, and the elastic reset member 4 is compressed; when the linear drive member 3 stops outputting the driving force, the elastic reset member 4 restores its deformation, and the movable ring 2 moves in the reverse direction.

[0052] Reference Figure 1 , Figure 2As shown in the figure, the switch component is used to control the power component to switch between the on state and the off state, and it includes a switch button 5. The switch button 5 is arranged at the top of the brake handle 73. The wire used to connect the switch button 5 and the power component (linear drive 3) is not shown in the figure. It can be arranged along the vehicle body, such as through a hollow pipe on the vehicle body. How to control the switching of the working state of the power component (linear drive 3) by the switch button 5 and how to lay the wires are all well-known technical common sense and will not be repeated here. The hub 81 of the wheel 8 is connected to the wheel body 82 by the spoke 83 support. When braking is required in an emergency, the brake handle 73 is pulled to block and stop the wheel body 82 of the wheel 8; at the same time, the switch button 5 can be pressed to switch the power component to the working state, and the first protrusion 11 on the positioning ring 1 and the second protrusion 21 on the movable ring 2 are interlaced and engaged with each other to stop the wheel hub 81; in this way, the wheel hub 81 and the wheel body 82 of the wheel 8 are braked synchronously, ensuring the timeliness and reliability of the braking operation, which is more suitable for the elderly and infirm.

[0053] [Example 2]

[0054] A wheelchair brake device is based on the first embodiment, except that:

[0055] Reference Figure 7 A guide mechanism is provided between the mounting cover 6 and the movable ring 2. The guide mechanism includes a guide block 241 provided on the circumference of the second ring body 24 of the movable ring 2 and a strip guide groove 62 provided on the inner wall of the mounting cover 6 and into which the guide block 241 is inserted. The guide blocks 241 are provided at three locations at equal intervals along the circumference of the movable ring 2, and the strip guide groove 62 is provided along the axial direction of the mounting cover 6.

[0056] Reference Figure 8 The power component includes a linear driving member 3 arranged along the axial direction of the movable ring member 2 and an elastic reset member 4 arranged in the mounting cover 6. The movable end of the linear driving member 3 passes through the end plate 61 and is connected to the movable ring body; the compression spring of the elastic reset member 4 has one end fixed to the end plate 61 and the other end fixed to the movable ring member 2.

[0057] [Example 3]

[0058] A wheelchair brake device is based on the first embodiment, and a guide mechanism similar to that in the second embodiment is arranged between the mounting cover 6 and the movable ring 2, except that:

[0059] Reference Fig. 9 and Fig.10, the inner diameter of the first ring body 23 of the movable ring 2 is larger than the diameter of the installation shaft 71, which reduces the contact area between the movable ring 2 and the installation shaft 71 and facilitates smooth sliding. At the same time, a secondary positioning ring 13 coaxial with the positioning ring 1 is fixedly arranged on the connecting plate 15. The outer diameter of the secondary positioning ring 13 is equal to the inner diameter of the first ring body 23, and a gap is formed between the secondary positioning ring 13 and the positioning ring 1 for the first ring body 23 to be inserted. The width of the secondary positioning ring 13 is larger than the width of the positioning ring 1, and a guide portion 131 is provided on the end face facing the movable ring 2. In the process of the movable ring 2 approaching the positioning ring 1, the guide portion 131 is first inserted into the first ring body 23, and then the first ring body 23 is inserted between the positioning ring 1 and the secondary positioning ring 13. This step-by-step insertion method can stop the wheelchair more smoothly.

[0060] [Application Examples]

[0061] A wheelchair, see Fig.11 and Fig.12 , which applies the wheelchair brake device provided by any one of the above-mentioned embodiments 1-3. Fig.13 During the braking operation, the wheelchair can be stopped in time by pulling the brake handle 73 in the direction of α as shown in the figure and / or pressing the switch button 5 at the top of the brake handle 73 in the direction of β as shown in the figure. The braking operation is labor-saving and convenient, and is more suitable for elderly and weak users.

[0062] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A wheelchair brake device, comprising a blocking member rotatably mounted on a frame (7) for abutting against a wheel (8), a brake handle (73) rotatably mounted on the frame (7), and a mechanical transmission assembly for linking the blocking member and the brake handle (73), characterized in that Also includes: A positioning ring (1), the positioning ring (1) being coaxially mounted on the side of a wheel hub (81) of a wheel (8), and a plurality of first protrusions (11) are provided on the inner circumferential side wall of the positioning ring (1) at equal intervals along the circumferential direction, and positioning grooves (12) are formed between adjacent first protrusions (11); A movable ring (2), the movable ring (2) being mounted on the vehicle frame (7) and being capable of approaching or moving away from the positioning ring (1) only along the axial direction of the positioning ring (1); a plurality of second protrusions (21) capable of being inserted into the positioning grooves (12) are arranged at equal intervals along the circumferential direction on the outer circumferential side wall of the movable ring (2), and limiting grooves (22) for the first protrusions (11) to be inserted into are formed between adjacent second protrusions (21); A power component, the power component is used to provide push-pull power to drive the movable ring (2) to approach or move away from the positioning ring (1); the power component has an open state and a closed state, when the power component is in the open state, the movable ring (2) moves in a direction approaching the positioning ring (1), and when the power component is in the closed state, the movable ring (2) moves in a direction away from the positioning ring (1); And a switch component installed on the brake handle (73), the switch component is used to control the power component to switch between an on state and a off state.

2. A wheelchair brake device according to claim 1, characterized in that: A first guide block (111) is provided at the end of the first protrusion (11) facing the movable ring (2), and a second guide block (211) is provided at the end of the second protrusion (21) facing the positioning ring (1).

3. A wheelchair brake device according to claim 2, characterized in that: The first guide block (111) and / or the second guide block (211) are triangular, arcuate or semicircular in shape.

4. A wheelchair brake device according to claim 2, characterized in that: The thickness of the second protrusion (21) gradually decreases towards the direction approaching the positioning ring (1).

5. A wheelchair brake device according to any one of claims 1 to 4, characterized in that: The power component comprises a plurality of linear driving components (3) which can generate thrust controlled by a switch component, and a plurality of elastic reset components (4) for driving the movable ring component (2) to reset; the linear driving components (3) and the elastic reset components (4) are evenly spaced along the circumference of the movable ring component (2).

6. A wheelchair brake device according to claim 5, characterized in that: It also includes a cylindrical mounting cover (6) arranged on the vehicle frame (7), wherein an end plate (61) is provided at one end of the mounting cover (6) away from the positioning ring member (1); the movable ring member (2) is coaxially arranged in the mounting cover (6); and a guide mechanism is provided between the mounting cover (6) and the movable ring member (2).

7. A wheelchair brake device according to claim 6, characterized in that: The guide mechanism comprises a guide block (241) arranged on the movable ring (2), and a strip guide groove (62) provided along the inner wall of the mounting cover (6) for the guide block (241) to be inserted into; the strip guide groove (62) is provided along the axial direction of the movable ring (2).

8. A wheelchair brake device according to claim 7, characterized in that: The linear drive member (3) is arranged on the end plate (61) along the axial direction of the movable ring member (2), and its movable end passes through the end plate (61) and is connected to the movable ring member (2); the elastic reset member (4) is arranged between the end plate (61) and the movable ring member (2).

9. A wheelchair brake device according to claim 7, characterized in that: The linear drive member (3) is arranged on the outer wall of the mounting cover (6) along an axial direction perpendicular to the movable ring member (2), and its movable end penetrates the mounting cover (6) and is inserted into the inner cavity of the mounting cover (6), and a wedge block (31) is provided at the end thereof; a wedge groove (242) for the wedge block (31) to be inserted into the end surface of the movable ring member (2), and the depth of the wedge groove (242) gradually increases along the radial direction of the movable ring member (2) toward the periphery of the movable ring member (2).

10. A wheelchair, using a wheelchair brake device according to any one of claims 1 to 9.

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