A wheelchair assistive device for going up and down stairs

Abstract

The present invention provides an auxiliary device for a wheelchair to go up and down stairs, which belongs to the technical field of wheelchair auxiliary equipment, and includes a servo mechanism, a pneumatic mechanism, an actuator and two racks; the two racks are fixed on the stairs along the direction of the stair slope, and the guide wheel in front of the electric wheelchair body is a gear matched with the racks; the servo mechanism is arranged on one side of the electric wheelchair body; a push cylinder of the actuator is fixed at the front end of the servo mechanism, and the other push cylinder is driven by the servo mechanism to move forward and backward; the front end of the push rod of each push cylinder is connected to a suction cup; each push cylinder is connected to a two-position five-way solenoid valve of a pneumatic mechanism in sequence through a pipeline, the two two-position five-way solenoid valves and the vacuum generator are connected to an air compressor, each suction cup is connected to a two-position two-way solenoid valve through a pipeline, and the two two-position two-way solenoid valves are connected to the vacuum generator. The device is relatively stable when going up and down stairs, and is not prone to side slipping and sliding down.

Description

Technical Field

[0001] The invention belongs to the technical field of wheelchair auxiliary equipment, and in particular relates to an auxiliary device for a wheelchair to go up and down stairs. Background Art

[0002] In real life, for some people who live in duplex buildings and need to use wheelchairs to travel, going up and down stairs is not an easy task.

[0003] There are three main types of stair climbing wheelchairs on the market. One is the tracked stair climbing wheelchair, which is heavy, bulky, and requires a lot of kinetic energy when turning, and has problems such as difficulty in turning. The other is the planetary stair climbing wheelchair, which has no anti-skid braking function when going up and down the stairs, and is prone to side slipping, so it needs to be pulled by manpower to prevent it from slipping when going up and down the stairs. The last type is the step-supported wheelchair, which is relatively safe, but has a complex transmission structure.

[0004] Therefore, the present application proposes an auxiliary device for a wheelchair to go up and down stairs to solve the above problems. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides an auxiliary device for a wheelchair to go up and down stairs.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] An auxiliary device for a wheelchair to go up and down stairs, comprising a servo mechanism, a pneumatic mechanism, an actuator and two racks;

[0008] The two racks are fixed on the stairs along the slope direction of the stairs, and the guide wheel in front of the electric wheelchair body is a gear matched with the racks;

[0009] The servo mechanism is arranged on one side of the electric wheelchair body;

[0010] The pneumatic mechanism includes an air compressor, a vacuum generator, two two-position five-way solenoid valves and two two-position two-way solenoid valves;

[0011] The actuator includes two push cylinders and two suction cups, one of the push cylinders is fixed at the front end of the servo mechanism, and the other push cylinder is driven by the servo mechanism to move forward and backward; the front end of the push rod of each push cylinder is connected to one suction cup;

[0012] Each of the pushing cylinders is connected to one of the two-position five-way solenoid valves in sequence through a pipeline, the two two-position five-way solenoid valves and the vacuum generator are connected to the air compressor, each of the suction cups is connected to one of the two-position two-way solenoid valves through a pipeline, and the two two-position two-way solenoid valves are connected to the vacuum generator.

[0013] Preferably, the servo mechanism includes a screw motor, a screw, a screw nut, a slider and a fixed block, the screw motor is fixed to a side wall of the electric wheelchair body through a motor support, the screw motor is close to the walking wheel of the electric wheelchair body, the fixed block is arranged in front of the screw motor and fixedly connected to a side wall of the electric wheelchair body, one end of the screw is fixedly connected to the output shaft of the screw motor, and the other end is rotatably connected to the fixed block, the screw nut is sleeved on the screw and threadedly connected to the screw, the slider is fixed on the screw nut, and the two pushing cylinders are respectively fixed on the slider and the fixed block.

[0014] Preferably, the air compressor is arranged on one side of the stairs, and the vacuum generator, two two-position five-way solenoid valves and two two-position two-way solenoid valves are arranged at the bottom of the electric wheelchair body.

[0015] Preferably, a muffler is connected to the vacuum generator.

[0016] Preferably, the model of the two-position five-way solenoid valve is two-position five-way 4V210-02, the model of the two-position two-way solenoid valve is two-position two-way 2V025-05, the model of the pushing cylinder is SC32-50; the model of the suction cup used is PFG-120+tail air intake J25-B01-A22, with a diameter of 220mm, and the model of the vacuum generator is EV15-R.

[0017] The auxiliary device for a wheelchair going up and down stairs provided by the present invention has a simple structure, a small size, and a light weight. The device is relatively stable when going up and down stairs and is not prone to side slipping or sliding down. The person can go up and down stairs quickly and smoothly without the assistance of others, thereby solving the problems of the existing technology in which the auxiliary device for a wheelchair is large in size, heavy in weight, prone to side slipping, and has a complex structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the auxiliary device for a wheelchair going up and down stairs according to Embodiment 1 of the present invention;

[0019] Figure 2 This is a schematic diagram of a wheelchair assisting device for going up and down stairs according to Embodiment 1 of the present invention;

[0020] Figure 3 This is a pneumatic principle diagram of the auxiliary device for a wheelchair going up and down stairs according to Example 1 of the present invention.

[0021] Description of reference numerals:

[0022] Rack 1, electric wheelchair body 2, walking wheel 3, gear 4, air compressor 5, vacuum generator 6, push cylinder 7, suction cup 8, screw motor 9, screw 10, slider 11, fixing block 12, two-position five-way solenoid valve 13, two-position two-way solenoid valve 14, muffler 15. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solution of the present invention and implement it, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the scope of protection of the present invention.

[0024] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the technical solutions of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In addition, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance. In the description of the present invention, it should be noted that, unless otherwise clearly specified or limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In the description of the present invention, unless otherwise specified, "plurality" means two or more, which will not be described in detail here.

[0026] Example 1

[0027] The present invention provides an auxiliary device for a wheelchair to go up and down stairs, specifically Figures 1 to 3 As shown, it includes a servo mechanism, a pneumatic mechanism, an actuator and two racks 1;

[0028] Two racks 1 are fixed on the stairs along the slope direction of the stairs, and the guide wheel in front of the electric wheelchair body 2 is a gear 4 that matches the racks 1;

[0029] The servo mechanism is arranged on one side of the electric wheelchair body 2;

[0030] The pneumatic mechanism includes an air compressor 5, a vacuum generator 6, two two-position five-way solenoid valves 13 and two two-position two-way solenoid valves 14;

[0031] The actuator includes two push cylinders 7 and two suction cups 8, one push cylinder 7 is fixed at the front end of the servo mechanism, and the other push cylinder 7 is driven by the servo mechanism to move forward and backward; the front end of the push rod of each push cylinder 7 is connected to a suction cup 8;

[0032] like Figure 3 As shown, each push cylinder 7 is connected to a two-position five-way solenoid valve 13 in sequence through a pipeline, the two two-position five-way solenoid valves 13 and the vacuum generator 6 are connected to the air compressor 5, each suction cup 8 is connected to a two-position two-way solenoid valve 14 through a pipeline, the two two-position two-way solenoid valves 14 are connected to the vacuum generator 6, and a muffler 15 is connected to the vacuum generator 6 in this embodiment.

[0033] Specifically, in this embodiment, the servo mechanism includes a lead screw motor 9, a lead screw 10, a lead screw nut, a slider 11 and a fixed block 12. The lead screw motor 9 is fixed to a side wall of the electric wheelchair body 2 through a motor support. The lead screw motor 9 is close to the running wheel 3 of the electric wheelchair body 2. The fixed block 12 is arranged in front of the lead screw motor 9 and is fixedly connected to a side wall of the electric wheelchair body 2. One end of the lead screw 10 is fixedly connected to the output shaft of the lead screw motor 9, and the other end is rotatably connected to the fixed block 12. The lead screw nut is sleeved on the lead screw 10 and is threadedly connected to the lead screw 10. The slider 11 is fixed to the lead screw nut, and two push cylinders 7 are respectively fixed to the slider 11 and the fixed block 12. The forward or reverse rotation of the lead screw motor 9 drives the lead screw 10 to rotate, and the lead screw 10 drives the lead screw nut to move forward and backward along the lead screw 10. The slider 11 moves with the lead screw nut, thereby driving the push cylinder 7 fixed on the slider 11 to move forward and backward.

[0034] Furthermore, in this embodiment, the air compressor 5 is arranged on one side of the stairs, and the vacuum generator 6, two two-position five-way solenoid valves 13 and two two-position two-way solenoid valves 14 are arranged at the bottom of the electric wheelchair body 2. The components are connected by sufficiently long pipes to ensure that the air compressor 5 can supply air to the components when the electric wheelchair body 2 goes up and down the stairs.

[0035] In this embodiment, the model of the two-position five-way solenoid valve 13 is two-position five-way 4V210-02, and the model of the two-position two-way solenoid valve 14 is two-position two-way 2V025-05, and the voltage is 220V; the model of the pushing cylinder 7 is SC32-50; the model of the suction cup 8 used is PFG-120+tail air intake J25-B01-A22, and the suction cup 8 is an industrial suction cup with a diameter of 220mm to ensure sufficient suction, and the model of the vacuum generator 6 is EV15-R.

[0036] In this embodiment, the screw motor 9 is a stepping motor. First, the front push cylinder 7 pushes the push rod outward to make the front suction cup 8 firmly attached to the wall. Then the screw motor 9 controls the rear push cylinder 7 to move forward one step and make the rear suction cup 8 firmly attached to the wall. This process is performed alternately, and finally it helps the wheelchair to go up and down stairs smoothly.

[0037] The working principle of the auxiliary device for a wheelchair going up and down stairs provided in this embodiment is as follows:

[0038] Before work, install the servo mechanism on one side of the wheelchair, install the push cylinder 7, suction cup 8, screw motor 9, screw 10, slider 11, fixed block 12 and other components, and then connect the air compressor 5, vacuum generator 6, push cylinder 7, suction cup 8, two-position five-way solenoid valve 13, and two-position two-way solenoid valve 14 through pipelines.

[0039] During operation, the screw motor 9 starts, and the air compressor 5 supplies air, which then drives the push cylinder 7 to push out the push rod to make the suction cup 8 stick to the wall, and then the vacuum generator 6 generates negative pressure to make the suction cup 8 stick to the wall. Then the suction cup 8 at the rear stops adsorption, and the screw motor 9 drives the screw 10 to rotate, and the screw 10 drives the slider 11 to feed a certain distance. Then the push cylinder 7 on the slider 11 pushes out the push rod to make the suction cup 8 stick to the wall, and the suction cup at the front stops adsorption again. This alternating operation allows the wheelchair to go up and down stairs smoothly. When moving, the front gear 4 and the rack 1 are meshed with each other to provide stability.

[0040] The embodiments described above are only preferred specific implementation modes of the present invention, and the protection scope of the present invention is not limited thereto. Any simple changes or equivalent replacements of the technical solutions that can be obviously obtained by any technician familiar with the field within the technical scope disclosed in the present invention belong to the protection scope of the present invention.

Claims

1. An auxiliary device for a wheelchair to go up and down stairs, characterized in that: It includes a servo mechanism, a pneumatic mechanism, an actuator and two racks (1); The two racks (1) are fixed on the stairs along the slope direction of the stairs, and the guide wheel in front of the electric wheelchair body (2) is a gear (4) matched with the racks (1); The servo mechanism is arranged on one side of the electric wheelchair body (2); The pneumatic mechanism comprises an air compressor (5), a vacuum generator (6), two two-position five-way solenoid valves (13) and two two-position two-way solenoid valves (14); The actuator comprises two pushing cylinders (7) and two suction cups (8), one pushing cylinder (7) is fixed at the front end of the servo mechanism, and the other pushing cylinder (7) is driven by the servo mechanism to move forward and backward; the front end of the push rod of each pushing cylinder (7) is connected to one suction cup (8); Each of the pushing cylinders (7) is connected in sequence to one of the two-position five-way solenoid valves (13) through a pipeline, and the two two-position five-way solenoid valves (13) and the vacuum generator (6) are connected to the air compressor (5), and each of the suction cups (8) is connected to one of the two-position two-way solenoid valves (14) through a pipeline, and the two two-position two-way solenoid valves (14) are connected to the vacuum generator (6); The servo mechanism comprises a lead screw motor (9), a lead screw (10), a lead screw nut, a slider (11) and a fixed block (12); the lead screw motor (9) is fixed to a side wall of the electric wheelchair body (2) through a motor support; the lead screw motor (9) is close to the walking wheel (3) of the electric wheelchair body (2); the fixed block (12) is arranged in front of the lead screw motor (9) and is fixedly connected to a side wall of the electric wheelchair body (2); one end of the lead screw (10) is fixedly connected to the output shaft of the lead screw motor (9), and the other end is rotatably connected to the fixed block (12); the lead screw nut is sleeved on the lead screw (10) and is threadedly connected to the lead screw (10); the slider (11) is fixed to the lead screw nut; and the two push cylinders (7) are respectively fixed to the slider (11) and the fixed block (12).

2. The auxiliary device for a wheelchair to go up and down stairs according to claim 1, characterized in that: The air compressor (5) is arranged on one side of the stairs, and the vacuum generator (6), two two-position five-way solenoid valves (13) and two two-position two-way solenoid valves (14) are arranged at the bottom of the electric wheelchair body (2).

3. The auxiliary device for a wheelchair to go up and down stairs according to claim 1, characterized in that: The vacuum generator (6) is connected to a silencer (15).

4. The auxiliary device for a wheelchair to go up and down stairs according to claim 1, characterized in that: The model of the two-position five-way solenoid valve (13) is two-position five-way 4V210-02, the model of the two-position two-way solenoid valve (14) is two-position two-way 2V025-05, the model of the pushing cylinder (7) is SC32-50; the model of the suction cup (8) used is PFG-120+tail air intake J25-B01-A22, with a diameter of 220 mm, and the model of the vacuum generator (6) is EV15-R.

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