Magnetorheological fluid variable damping carrier roller

Abstract

The invention discloses a magnetorheological fluid variable damping carrier roller, and belongs to the technical field of mechanical braking. A magnetorheological fluid variable damping part is additionally arranged in an undamped carrier roller, namely, a rotating magnetic ring (9) is embedded into a rotating shell (6) in an interference mode, the rotating magnetic ring and a rotating magnet vane (11) are fixedly connected through a bolt, a gap between the rotating magnet vane and a static magnetic barrel (10) is filled with magnetorheological fluid (8) and sealed through a sealing ring (12), a magnet exciting coil (7) is fixed into a groove of the static magnetic barrel, and the static magnetic barrel and a static shaft (1) are connected in an interference fit mode. The magnetorheological fluid variable damping carrier roller is simple and compact in structure and flexible and convenient to control, and cost is remarkably reduced; controllable damping force can be provided, the rotating speed of a rotating part of the carrier roller is effectively reduced, the overspeed phenomenon is avoided, reliability of a belt conveyor is improved, and safe production is guaranteed.

Description

technical field [0001] The invention relates to a magneto-rheological fluid variable damping idler, which is especially suitable for a variable damping idler of a belt conveyor and belongs to the technical field of mechanical braking. Background technique [0002] Magnetorheological fluid is one of the important branches of smart materials. It is mainly composed of soft magnetic particles, base carrier fluid and additives coated on the particle surface to prevent particle settlement. It will have significant rheological properties under the action of a magnetic field. The basic characteristics are: when there is no external magnetic field, it is in a free-flowing state; under the external magnetic field, it changes from a free-flowing state to a semi-solid instantaneously, showing a controllable shear yield strength, and this transformation is reversible. Due to the characteristics of rapid response, reversible change and easy control of magnetorheological fluid, it has been...

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Problems solved by technology

At present, there are many patent documents related to belt conveyor rollers in China. For example, the Chinese invention patent with the publication number CN101580177 disclosed "controllable brake rollers" on November 18, 2009, which controls the dynamic and static friction plates through hydraulic pressure. The friction force between them can realize controllable braking, but the control system is complicated and the implementation cost is high; the Chinese invention patent with the publication number CN101695972A discloses "a hydraulic damping idler roller", which realizes the adjustment of the braking torque of the belt through a positive displacement pump , the device structure is relatively complex and the implementation cost is very high

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