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CN-121987429-A - Constant-force spring energy storage assisting wheelchair and energy recovery method thereof

CN121987429ACN 121987429 ACN121987429 ACN 121987429ACN-121987429-A

Abstract

The invention discloses a constant force spring energy storage power assisting wheelchair and an energy recovery method thereof, and belongs to the technical field of walking assisting instruments. Aiming at the half-floor home scene of the old community, the steel wire rope is pulled out by human body gravity when going downstairs to wind up the constant force spring for energy storage, and the constant force spring is pulled back to wind up the star wheel for rotating and releasing energy when going upstairs, so that the energy recycling is realized. The core innovation comprises a scroll constant force spring, a steel wire rope and a ratchet mechanism, wherein a downstairs coil spring stores energy, a downstairs coil spring releases energy and assists power, a mechanical holding lock is used for holding and unlocking and locking by loosening hands, safety is ensured, and the downstairs coil spring is designed to turn around by 180 degrees, accompanies front guide and eliminates sight blind areas. The technical scheme adopts a pure mechanical structure, has zero electric power, zero leakage and no maintenance for life, the service life of the constant force spring is more than 10 ten thousand times, and the constant tension force 150-250N can provide 50-70% of assistance for going upstairs. The invention has low cost and is suitable for the environment demand scene of half-layer household high frequency, high safety, low cost and extreme temperature.

Inventors

  • MO SHAOQIANG

Assignees

  • 莫少强

Dates

Publication Date
20260508
Application Date
20260311

Claims (10)

  1. 1. A constant force spring energy storage booster wheelchair, comprising: The device comprises a chassis frame, front wheel universal wheels, rear wheels, star wheel stair climbing mechanisms, a constant force spring energy storage system, a mechanical holding lock, a seat and a control armrest, wherein the front wheel universal wheels are arranged at the front part of the chassis frame, the rear wheels are arranged at the rear part of the chassis frame, the star wheel stair climbing mechanisms are arranged at the rear part of the chassis frame and comprise a Y-shaped bracket and three small wheels arranged at the end parts of the bracket, the center of the Y-shaped bracket is connected with a ratchet wheel mechanism, the constant force spring energy storage system is arranged at the chassis frame and comprises a scroll constant force spring, a wire rope winding drum and a ratchet wheel locking mechanism, the constant force spring is connected with the star wheel mechanism through a wire rope, the wire rope is pulled out when going downstairs, the constant force spring is wound for energy storage, the ratchet wheel is locked and kept, the ratchet wheel is unlocked when going upstairs, the constant force spring is wound back, the star wheel is pulled through the wire rope to rotate to provide assistance, the mechanical holding lock is arranged at the back of the seat, the seat is arranged above the chassis frame and connected with the chassis frame through an inclination angle adjusting mechanism, and the control armrest is arranged at the back of the seat, and the mechanical holding lock is internally.
  2. 2. The constant force spring energy storage power assisting wheelchair according to claim 1, further comprising a star wheel lifting clutch mechanism, wherein the star wheel lifting clutch mechanism comprises a pedal lever, a connecting rod, a star wheel bracket, a ratchet clutch and a return spring, and the pedal lever is connected with the star wheel bracket and the ratchet clutch shifting fork through the connecting rod; the flat mode is that the pedal is loosened, the return spring pulls up the star wheel support, the star wheel is lifted off the ground, the ratchet clutch is separated, and the constant force spring is disconnected with the star wheel; The upstairs mode is that the star wheel is pushed forward by stepping down, the star wheel is descended to the ground, the ratchet clutch is connected in two directions, and the constant force spring is wound back to drive the star wheel; in the descending mode, the pedal is stepped down and pushed back, the star wheel descends to land, the ratchet clutch is in one-way joint, the constant force spring is wound up to store energy, and the ratchet idles to allow descending.
  3. 3. The constant force spring energy storage assisted wheelchair of claim 1, wherein the constant force spring energy storage system comprises: In the downstairs state, the steel wire rope is pulled out, the constant force spring is wound up for energy storage, the ratchet wheel is locked for energy retention, and the wheelchair slowly descends; In the upstairs state, the ratchet wheel is unlocked, the constant force spring is rewound, and the wire rope pulls the star wheel to rotate, so that constant force assisting uplink is provided.
  4. 4. The constant force spring energy storage assisted wheelchair of claim 1, wherein the mechanical grip lock comprises: In an unclamped state, the spring extends outwards, the pawl locks the ratchet wheel, and the constant force spring can be locked; The holding state is that the spring is compressed, the pawl is retracted to unlock, and the constant force spring can be rewound to release energy.
  5. 5. The constant force spring energy storage assisting wheelchair according to claim 1, wherein the seat is connected with the chassis frame through an inclination angle adjusting mechanism and can be adjusted to be horizontal, inclined backwards by 3-8 degrees or inclined forwards by 3-8 degrees, and the seat corresponds to a flat ground mode, an upstairs mode and a downstairs mode respectively.
  6. 6. The constant force spring energy storage power assisting wheelchair according to claim 1, wherein three small wheels of the star wheel stair climbing mechanism are distributed at an angle of 100-140 degrees, the diameter of each small wheel is 60-100mm, the overall diameter of the star wheel is 150-250mm, and at least two points are ensured to be in contact with steps.
  7. 7. The constant force spring energy storage assisting wheelchair according to claim 1, wherein the downstairs mode comprises that a seat tilts forward by 3-8 degrees, the wheelchair turns 180 degrees to enable a star wheel to face downwards a stair, a attendant moves to the front to hold a control handrail, a steel wire rope is pulled out, a constant force spring is wound up for energy storage, and a ratchet wheel is locked for energy retention.
  8. 8. The constant force spring energy storage assisting wheelchair according to claim 1, wherein the upstairs mode comprises that a seat is reclined for 3-8 degrees, a attendant moves to the rear to hold the control handrail, the ratchet wheel is unlocked, the constant force spring is rewound, the star wheel is pulled to rotate through a steel wire rope, constant force assistance is provided, and the attendant assists in providing residual thrust.
  9. 9. The energy recovery method of the constant force spring energy storage assisting wheelchair is characterized by comprising the following steps of: S1, checking equipment to confirm that a constant force spring is in an initial relaxed state; S2, before going downstairs, turning the wheelchair around 180 degrees, leaning forward the seat by 3-8 degrees, and moving the star wheel towards the lower part of the stairs and the accompanying personnel to the front; S3, the accompanying personnel hold the control armrests by two hands, the mechanical holding lock is unlocked, and the wheelchair is slowly pulled down; s4, human body gravity drives the star wheel to rotate, the steel wire rope is pulled out, the constant force spring is wound up for energy storage, and the ratchet wheel is automatically locked for energy retention; S5, after reaching the lower-layer platform, loosening the control handrail, locking by a mechanical holding lock, and keeping an energy storage state by a constant force spring; S6, before going upstairs, the seat is leaned back by 3-8 degrees, accompanying personnel move to the rear, hold the control armrests with two hands, and unlock the mechanical holding lock; S7, unlocking a ratchet wheel, rewinding a constant force spring, and pulling a star wheel to rotate by a steel wire rope to provide constant force assistance for ascending; and S8, after the constant force spring is reeled, the wheelchair reaches an upper platform, and energy recovery and recycling are completed.
  10. 10. The energy recovery method of claim 9, wherein the constant tension of the constant force spring is 150-250N, the energy storage efficiency is 85%, 50-70% of the energy required for going upstairs can be provided, and the remaining 30-50% is provided by the attendant personnel.

Description

Constant-force spring energy storage assisting wheelchair and energy recovery method thereof Technical Field The invention relates to the technical field of walking-aid instruments, in particular to a half-layer household-assisted wheelchair capable of recovering gravitational potential energy and storing energy by a constant force spring and an energy recovery method thereof. Background 1.1 Social pain spots of half-layer home With the deepening of the aging degree of China, the scheme of 'half-storey entrance' is commonly adopted for additionally installing elevators in old buildings, and 4-8-level steps (with the height difference of 0.8-1.2 m) exist between an elevator stopping storey and a resident entrance door. The last half layer of the wheelchair is the biggest obstacle for the travel of the old with inconvenient actions. 1.2 Drawbacks of the prior art The existing stair climbing wheelchair is mainly divided into three types: (1) The electric wheelchair relies on a battery and a motor, has the problems of heavy weight, high cost, multiple faults, difficult maintenance and the like, and completely fails once power is off. (2) Pure manual wheelchair, no booster, laborious upstairs and dangerous downstairs, and has high physical requirement for accompanying personnel. (3) The pneumatic/hydraulic auxiliary wheelchair is partially assisted by a pneumatic spring or a hydraulic cylinder, but has the problems of ageing sealing, leakage of air and liquid, frequent maintenance and the like, and has limited service life. 1.3 Tendency of technological development The constant force spring (Constant Force Spring) is a special scroll spring, can provide constant tension in a larger stroke range, and is widely applied to the fields of automobile safety belts, elevator balance systems, medical appliances and the like. The wheelchair has the characteristics of pure mechanical structure, maintenance-free and long service life, and is not applied to the upstairs and downstairs assistance of the wheelchair. Disclosure of Invention 2.1 Technical problem to be solved The invention aims to solve the technical problems of providing a constant force spring energy storage power-assisted wheelchair and an energy recovery method thereof, which realize safe, labor-saving and convenient passing of half-layer stairs by recovering gravitational potential energy of a human body when going downstairs and releasing constant force spring energy storage when going upstairs, and simultaneously realize pure mechanical structure, zero electric power, zero leakage and life maintenance-free. 2.2 Technical scheme In order to achieve the above purpose, the invention adopts the following technical scheme: a constant force spring energy storage assisted wheelchair comprising: A chassis frame as a whole machine support structure; the front wheel universal wheels are arranged at the front part of the chassis frame and used for steering when walking on level ground; the rear wheel is arranged at the rear part of the chassis frame and used for supporting when walking on level ground; The star wheel stair climbing mechanism is arranged at the rear part of the chassis frame and comprises a Y-shaped bracket and three small wheels arranged at the end part of the bracket, and the center of the Y-shaped bracket is connected with the ratchet mechanism, wherein the three small wheels of the star wheel stair climbing mechanism are distributed at 100-140 degrees, the diameter of each small wheel is 60-100mm, the overall diameter of the star wheel is 150-250mm, and at least two points are ensured to be contacted with steps; The constant tension spring energy storage system is arranged on a chassis frame and comprises a scroll constant force spring, a wire rope winding drum and a ratchet locking mechanism, wherein the free end of the constant force spring is connected with the wire rope, the wire rope is wound on the winding drum and is connected with the star wheel mechanism, the constant tension of the constant force spring is 150-250N and is adjusted according to 50-100kg of the weight of the old, the wire rope is pulled out when going downstairs, the constant force spring is wound up for energy storage, the ratchet is locked for energy retention, the ratchet is unlocked when going upstairs, and the constant force spring is rewound, and the star wheel is pulled by the wire rope to rotate for providing assistance; the mechanical holding lock is arranged on the control handrail and is connected with the ratchet locking mechanism through a steel rope, and comprises an unclamped state (a spring extends outwards, a pawl locks a ratchet wheel, a constant force spring keeps locking) and a held state (the spring is compressed, the pawl is retracted and unlocked, and the constant force spring can be rewound to release energy); The seat is arranged above the chassis frame and is connected with the chassis frame through the inclination angle adjusting mechanism, and