Magnetorheological cable drive braking system and control method thereof

Abstract

The invention relates to the technical field of cable braking, and discloses a magnetorheological cable drive braking system and a control method thereof. The magnetorheological cable drive braking system comprises a base, a controller, a motor and a braking mechanism; the brake mechanism comprises a case, and a movable piece, a reciprocating screw and a guide rod are arranged in an inner cavity of the case; the motor is in driving connection with the reciprocating screw, and the reciprocating screw is coaxially and fixedly connected with a winding drum; a rope is wound on the winding drum; anelectromagnetic coil is wound on the side wall of the case, and the inner cavity of the case is filled with magnetorheological fluid; and the controller is in communication connection with a speed measuring mechanism, and is electrically connected with the electromagnetic coil. According to the magnetorheological cable drive braking system, the movable piece is driven by the reciprocating screw to reciprocate in the case, and when the falling speed is too high, the electromagnetic coil is switched on through the controller to generate a magnetic field, so that the viscosity of magnetorheological fluid is increased, the resistance of the movable piece is increased, and the speeds of the reciprocating screw and the winding drum are quickly reduced until the reciprocating screw and the winding drum stop or are rotated at constant speed; therefore, the loaded cable end stops falling or slides down at constant speed, safe braking of the cable is achieved, and the motor is protected.

Description

technical field [0001] The invention relates to the technical field of cable braking, in particular to a magneto-rheological-based cable-driven braking system and a control method thereof. Background technique [0002] With the rapid development of modern high-rise buildings, elevators have become an indispensable means of vertical transportation in people's lives. With the number of elevators increasing year by year and the vertical lifting speed getting faster and faster, the incidence of accidents is also increasing. It directly affects the personal safety of passengers, so the elevator, as a special equipment, should have higher and higher requirements for its safety device. [0003] Most of the existing elevators use cables to drive up and down. The braking device is used as an elevator safety device, and its performance directly affects the personal safety of passengers. Currently, the commonly used braking devices include spring buffers, polyurethane buffers and hydra...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing elevators use cables to drive up and down. The braking device is used as an elevator safety device, and its performance directly affects the personal safety of passengers. Currently, the commonly used braking devices include spring buffers, polyurethane buffers and hydraulic buffers; Among them, the spring buffer and the polyurethane buffer are energy storage buffers, which mainly use the structural compression to form a reaction force, and convert the impact kinetic energy of the car into the internal energy of the buffer, and then play a buffering role. However, rebound phenomenon occurs after the buffering ends. It is only suitable for low-speed elevators. In comparison, hydraulic buffers have a short buffer stroke and are not suitable for applications with long braking distances.

[0004] The above-mentioned braking devices all operate at the limit position of the car falling process, and there is no effective slowing down for the car falling process, causing the car to hit the buffer to stop at a relatively high speed, and the impact force sometimes exceeds the human body. The tolerance range; and the motor that drives the cable retraction is prone to burning problems during the emergency fall

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