A water-cooled emergency brake with variable working space volume

Abstract

The invention discloses a water-cooled emergency brake with a variable volume of working space, which comprises a static braking part, a rotating part and a magneto-rheological fluid medium working part; , cooling liquid passage, booster air passage; the rotating part includes a fixedly connected brake shaft, a brake disc, a magnetic isolation component, a permanent magnet installed on the outer diameter of the brake disc, and a permanent magnet installed inside the brake shaft. Multi-stage excitation coil, etc. The invention adopts two working modes of magnetorheological fluid shearing and extrusion to generate braking force; in the emergency braking process, the extrusion braking effect is effectively improved, and the braking capacity of the magnetorheological fluid in the extrusion mode is increased; effectively Increase the braking force generated by the shear mode; it can realize that the device still has the braking torque in the case of emergency power failure; it can realize the heat exchange process at a close distance with the working space and improve the overall heat dissipation efficiency; the braking force can be adjusted through the coil, and the braking force The actuation process is flexible and controllable, can transmit large braking torque, and has high safety.

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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