A mechanical delay secondary brake manual emergency oil return device and method

Abstract

A mechanical-delay two-stage braking manual emergency oil return device and a method comprise a manual reversing valve, a delay valve and a speed-adjusting valve, etc. A brake system is a final actuator which guarantees safe operation of an elevator and realizes various kinds of protection, wherein the elevator will automatically start safe braking under any accident state, but a safe braking failure will cause occurrence of major accidents. The device is a remedial measure used to deal with the safe braking failure, wherein when a driver finds the safe braking failure, the driver operates the manual reversing valve according to a guiding direction of an indicator light installed in the device in order to again realize the safe braking including well mouth one-stage safe braking and in-well two-stage safe braking, which has the same function with the brake system. The brake system realizes the braking by electric delay of two-stage braking time and reversing of an electromagnetic reversing valve in order to avoid an electric control failure. The device makes use of the delay valve and the speed-adjusting valve to realize the mechanical delay of the two-stage braking time and the reversing of the manual reversing valve so as to realize the braking which is more reliable.

Description

technical field [0001] The invention relates to a manual emergency oil return device and method, in particular to a manual emergency brake suitable for the braking system of a hoist, and also suitable for the manual emergency braking of the braking system of a belt conveyor. Background technique [0002] The braking system of the hoist is composed of a brake, a hydraulic station, and an electric control device. It is braked by disc spring force, and the brake is released by oil pressure. Faults such as disc spring fatigue and piston jamming in one brake only make the braking force of this brake insufficient or unable to brake, but it does not affect the braking of other brakes, and has little effect on the braking of the entire hoist , Of course, the brake failure should be eliminated in time. The hydraulic station provides pressure oil of different oil pressures for all brakes to achieve brake opening and braking. If the pressure oil pressure does not reach the specified ...

AI Technical Summary

Problems solved by technology

[0005] However, once the above-mentioned safety brake fails, it will lead to major accidents such as overwinding of the hoist, tank falling, and sports car.

For example, at 9:00 on October 8, 2009, a fall accident occurred in the main hoisting shaft of the South Mine of Shanxing Antimony Industry Co., Ltd., Lengshuijiang City, Loudi City, Hunan Province. The depth of the shaft was 532 meters. When the cage went down to 60 meters from the bottom, the brake failed It caused a speeding car. At that time, 31 people in the cage fell into the well with the cage, killing 26 people and seriously injuring 5 people.

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