Safety brake series redundant secondary brake hydraulic station and its control method

Abstract

Provided are a safety braking series redundancy two-stage braking hydraulic station and a control method thereof. The hydraulic station comprises an oil pump, a motor, a proportional overflow valve, an overflow valve, a one-way throttling valve, an energy accumulator, sensors used for monitoring valve positions, B-tube brakes, V-tube brakes and electromagnetic reversing valves. One channel conducts connection of two electromagnetic reversing valves adopting parallel connection to realize parallel redundancy conduction, and one channel blocks connection of two electromagnetic reversing valves adopting series connection to realize series redundancy blocking. The two series connection electromagnetic reversing valves are adopted, pressure oil channels of the B-tube brakes and a residual oil pressure of the proportional overflow valve are blocked, and the B-tube brakes maintain a first-stage braking oil pressure valve of second-class safety braking in a well. There are three channels for safety braking, each channel is redundant through two simultaneous motion electromagnetic reversing valves, if there is one electromagnetic reversing valve in each channel has a position change failure, safety braking can still be completed, the sensors used for monitoring the valve positions, an alarm is given or shutting is conducted, and a lifter is started next time.

Description

technical field [0001] The invention relates to a safety brake redundant hydraulic station and a method thereof, in particular to a safety brake serial redundant secondary brake hydraulic station suitable for hoist brakes or other machine brakes and a control method thereof. Background technique [0002] Article 425 of the "Coal Mine Safety Regulations" implemented on October 1, 2016 stipulates that safety braking must have parallel redundant oil return channels. [0003] The E149A hydraulic station shown in Figure 4-45 on page 186 of "Mine Hoist Troubleshooting and Technical Transformation" published in July 2013, although the two electromagnetic reversing valves 11 are connected in parallel but not redundant, how can it be called parallel redundancy? Two electromagnetic reversing valves connected in parallel on one channel, one of which has a transposition failure, can still complete this safe braking, which is called parallel redundancy. When the first-level safety brake...

AI Technical Summary

Problems solved by technology

[0005] The existing two-stage brake hydraulic station has the following problems: (1) The proportional overflow valve of the brake group and power failure needs to be blocked during safe braking. Two parallel electromagnetic reversing valve connections cannot achieve redundancy If any one of the two parallel electromagnetic reversing valves fails, the pressure oil of the brake group will flow back to the oil tank through the faulty electromagnetic reversing valve and the power-off proportional relief valve, and the brake group will brake quickly. If the oil pressure value required by the secondary brake is not maintained, the secondary brake may fail, and the rope may be broken or slipped. The connection of two electromagnetic reversing valves in series cannot achieve redundant conduction. If the first electromagnetic reversing valve has a transposition fault in the middle position and does not conduct, it will block the pressure oil of the brake group from the overflow. In the channel of the valve, the pressure oil of the brake group is still the working pressure of the brake, which does not reach the first-stage brake oil pressure in the well, resulting in the failure of the first-stage brake in the well

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