Water-cooled emergency brake with variable working space volume

Abstract

The invention discloses a water-cooled emergency brake with a variable working space volume. The water-cooled emergency brake comprises a static braking part, a rotating part and a magnetorheologicalfluid medium working part, wherein the static braking part comprises a magnetic conductive shell, a pressurizing air bag, a braking disc (12), a cooling liquid channel and a pressurizing air channel,and the rotating part comprises a brake shaft, a braking disc (6), a magnetic isolation part, a permanent magnet installed on the outer diameter of the brake disc (6), a multi-stage magnet exciting coil installed inside the brake shaft and the like. According to the water-cooled emergency brake with the variable working space volume, a magnetorheological fluid shearing working mode and a magnetorheological fluid extruding working mode are adopted to generate braking force, in an emergency braking process, the extrusion braking effect is effectively improved, the magnetorheological fluid braking capacity in the extrusion mode is improved, the braking force generated by the shearing mode is effectively increased, under the condition of emergency power failure, the device still has braking torque, a short-distance heat exchange process can be realized with a working space, the overall heat dissipation efficiency is improved, the braking force can be adjusted through a coil, the braking process is flexible and controllable, larger braking torque can be transmitted, and safety is high.

Description

technical field [0001] The invention relates to a magnetorheological fluid emergency braking device, in particular to a water-cooled magnetorheological fluid emergency brake with variable working space volume, which belongs to the technical field of mechanical braking. Background technique [0002] Smart material—magnetorheological fluid is a particle suspension mainly composed of soft magnetic particles, base carrier liquid and additives wrapped on the surface of soft magnetic particles, which has unique rheological properties. Under the action of an external magnetic field, the soft magnetic particles of the magnetorheological fluid in the microscopic phenomenon will instantly gather into a chain structure along the direction of the magnetic force line, and in the macroscopic state, the viscosity of the magnetorheological fluid will change from a non-Newtonian to a millisecond response speed. The fluid state changes to a semi-solid state, and this change is reversible. Be...

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Problems solved by technology

At present, there are already some magnetorheological fluid brake patents at home and abroad. The Chinese patent "Double Disc Squeeze Magnetorheological Brake" (application number: CN201220027130.0) published on August 10, 2011 uses permanent magnets as The magnetic source changes the direction of the closed magnetic circuit through the rotation of the movable cage to achieve braking, but increasing the overall braking force of the device can only be achieved by increasing the excitation current

The Chinese patent "A Magnetorheological Fluid Emergency Brake" (publication number: CN108999896A) published on December 14, 2018, the device converts the traditional magnetorheological fluid shear braking working mode into shearing and squeezing multiple Braking in this mode effectively increases the overall braking effect of the device, and at the same time, the number of helical turns is used to limit the braking distance. However, when the device is in the extrusion working mode, the volume of the magneto-rheological fluid braking working space does not change. , the extrusion effect is slightly worse

Both of the above two inventions are difficult to transmit large braking torque, have no effective heat dissipation method, and cannot meet large-scale and emergency braking occasions such as coal mines that require large braking torque. Therefore, it is very important to design and develop new magneto-rheological fluid emergency brakes. the meaning of

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