Safety braking series-parallel connection redundancy two-level braking hydraulic station and control method thereof

Abstract

The invention discloses a safety braking series-parallel connection redundancy two-level braking hydraulic station and a control method thereof. The hydraulic station comprises an oil pump, a motor, aproportional overflow valve, an overflow valve, a pressure reducing valve, a one-way valve, an energy accumulator, a sensor for monitoring the valve position, a B pipe brake, an A pipe brake and electromagnetic reversing valves. During safety braking, connection of an A brake and an oil tank and connection of a B brake and the oil tank are achieved through the two electromagnetic reversing valvesconnected in parallel, and parallel redundancy conduction is achieved. Connection of the B pipe brake and the proportional overflow valve is achieved through the two electromagnetic reversing valvesconnected in series, parallel connection of the B pipe brake and the overflow valve is achieved through one electromagnetic reversing valve and the two electromagnetic reversing valves connected in series, parallel redundancy conduction is achieved, or, connection of the B pipe brake and the overflow valve is achieved through the two electromagnetic reversing valves connected in parallel, parallelredundancy conduction is achieved, a closed loop is formed through the B pipe brake, and the first-level brake oil pressure value is maintained. Four channels are achieved during safety braking and are in redundancy, and if the transposition fault happens to one electromagnetic reversing valve in each channel, safety braking at the time can still be finished.

Description

technical field [0001] The invention relates to a safety braking series-parallel redundant secondary braking hydraulic station of a hoist and a control method thereof, in particular to a hoist brake or other machine brakes. 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 is implemented in the well, according to Table 4...

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Problems solved by technology

[0005] The existing two-level brake hydraulic station has the following problems: (1) Article 425 of the "Coal Mine Safety Regulations" stipulates that there must be parallel redundant oil return channels for safe braking. The electric proportional relief valve needs to be blocked. The connection of two parallel electromagnetic directional valves cannot achieve redundant blocking. If any of the two parallel electromagnetic directional valves fails, the pressure oil of the brake group passes through the faulty electromagnetic The reversing valve and the power-off proportional relief valve conduct and flow back to the oil tank, and the brake group brakes quickly, failing to maintain the oil pressure value required for the secondary brake, resulting in the failure of the secondary brake, which may cause broken ropes or slippage. (2) During safety braking, the brake group and the relief valve need to be connected. Two electromagnetic reversing valves connected in series cannot achieve redundant conduction. If the first electromagnetic reversing valve appears at The transposition fault of non-conduction in the middle position blocks the passage of the pressure oil of the brake group to the relief valve, and the pressure oil of the brake group is still at the working pressure of the brake, and does not reach the first-stage brake oil in the well pressure, causing the failure of the first stage brake in the well

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