Redundant constant deceleration hydraulic station for safe braking and its control method

Abstract

The invention discloses a safety braking redundant constant deceleration hydraulic station and a control method thereof. The hydraulic station includes an oil pump, a motor, a proportional relief valve, a proportional direction valve, relief valves, accumulators, a sensor for monitoring valve positions, a brake pack and solenoid directional valves. Before driving, the transposition of the solenoiddirectional valves is diagnosed to be correct and the solenoid directional valves are operated, and safety braking is realized through two forms of control, specifically, constant deceleration braking is realized by the proportional directional valve and secondary braking is realized by the relief valves. When the former form fails, the former form is redundantly closed, and the next form is redundantly entered. For safety braking, two solenoid directional valves in parallel are used to for redundant conduction for a pipeline need to be conducted, and two solenoid directional valves in seriesare used for redundant blocking for the pipeline need to be conducted. A plurality of passages are arranged during safety braking, and each passage is redundant. If the solenoid directional valves fail in transposition for each passage, safety braking can still be completed. The sensor for monitoring the valve positions diagnoses the transposition failure of the solenoid directional valves and alarms or locks for next time driving.

Description

technical field [0001] The invention relates to a constant deceleration braking hydraulic station with a redundant safety braking channel and a control method thereof, in particular to a redundant safety braking channel constant deceleration braking hydraulic pressure station suitable for hoister hydraulic disc brakes or other machine disc brakes. station and its control method. 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 E141 hydraulic station shown in Figure 4-38 on page 175 of "Mine Hoist Troubleshooting and Technical Transformation" published in July 2013, although the two electromagnetic reversing valves G1 are connected in parallel but not redundant, how can it be called parallel redundant? oil return channel? Two electromagnetic reversing valves connected in parallel on one oil return channel, one of which h...

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Problems solved by technology

[0004] The invention patent with the patent number ZL200810023108.7 is attached figure 2 In the series, the G4 and G9 in series are not redundant, the pressure oil of group B brakes, when the first level of safety braking in the well, if there is a transposition fault in G4 where the spool is stuck in the middle, the brakes of group B will be blocked. The passage of the brake leading to the relief valve, the pressure oil of the group B brake brake is the working pressure of the brake, which leads to the failure of the secondary brake in the well

[0005] Existing hoist hydraulic station, existing problems: (1) Article 425 of the "Coal Mine Safety Regulations" stipulates that there must be parallel redundant oil return channels for safe braking, and the ratio of brake group to power failure during safe braking The overflow valve needs to be blocked. The use 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 directional valve and The proportional overflow valve of the power failure turns back to the oil tank, and the brake group brakes quickly, failing to maintain the oil pressure value required for constant deceleration braking, resulting in failure of constant deceleration braking, and possible rope breakage or slipping rope accidents; ( 2) During safe braking, the brake group and the overflow valve need to be connected. Two electromagnetic reversing valves in series cannot achieve redundant conduction. If the first electromagnetic reversing valve is in the middle position, it will not be connected. The transposition fault of the brake block 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 the working pressure of the brake, which does not reach the first stage of the brake oil pressure in the well, resulting in the first stage of the well. The primary brake fails; (3) Only one proportional directional valve does not constitute redundancy. The proportional directional valve is the core component of constant deceleration control. The oil pressure value required for constant deceleration braking is not maintained, resulting in constant deceleration braking failure, and there may be rope breakage or rope slipping accidents

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