Safety device used for elevator and utilizing magnetorheological fluid for speed control

Abstract

The invention relates to the technical field of safety devices, and discloses a safety device used for an elevator and utilizing magnetorheological fluid for speed control. The safety device comprisesa driving roller, a supporting seat is arranged at one end of the driving roller, and the inner side wall of the supporting seat is fixedly connected with a roller seat; the interior of the roller seat is rotationally connected with a roller shaft, and one end of the roller shaft is fixedly connected with one end of the driving roller; and a first coil is wound on the outer side wall of the roller shaft. The rotating speed of the roller shaft is increased, a current generated by the first coil is also larger, thus a current on a second coil connected with the first coil is also increased accordingly, thus a magnetic field generated by the second coil and an iron core are also higher, according to the characteristic of the magnetorheological fluid, the larger the magnetic field around themagnetorheological fluid is, the larger the viscosity of the magnetorheological fluid is, thus the shearing stress needing to be overcome by a connecting shaft in the magnetorheological fluid is larger, the rotating speeds of the roller shaft connected with the connecting shaft and the driving roller are decreased, thus the purpose of speed control is achieved, and the phenomena that a chain runsoff a rail and is even broken are effectively avoided.

Description

technical field [0001] The invention relates to the technical field of safety devices, in particular to a safety device for a hoist that uses magnetorheological fluid to control the speed. Background technique [0002] The hoist is a large-scale mechanical equipment that is transported by changing the potential energy, such as mine hoist, dam crossing hoist, etc. Among them, the chain plate hoist is a kind of hoist, and the chain plate hoist is mainly composed of a motor, a chain, a conveyor roller and Conveyor plates and other components. At present, in the process of material transportation and metal parts machining in China, large quantities of transfers are required. For the transportation of these materials, chain plate elevators are usually used. [0003] In the prior art, during the working process of the hoist, the motor directly drives the sprocket through the chain. When the load of the hoist suddenly decreases, the output speed of the motor will suddenly increase,...

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Problems solved by technology

[0003] In the prior art, during the working process of the hoist, the motor directly drives the sprocket through the chain. When the load of the hoist suddenly decreases, the output speed of the motor will suddenly increase, resulting in a stall phenomenon, which leads to chain failure. Derailing or even breaking. In addition, during the high-speed rotation of the roller shaft, if the connection of the roller shaft is not stable, it will cause the roller shaft to shake and affect the transportation of materials.

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