A constant deceleration safety braking redundant hydraulic station and its control method

Abstract

A constant-speed-reducing safe braking redundant hydraulic station comprises an oil pump, a motor, a proportional overflow valve, a proportion direction valve, an overflow valve, a one-way valve, an energy accumulator, a sensor for monitoring a valve position, a brake set and electromagnetic reversing valves; before vehicle starting, running is performed when it is diagnosed that the valve positions of the electromagnetic reversing valves are correct, and safe braking is achieved in three manners; the proportion direction valve achieves constant speed reducing braking, the proportional overflow valve achieves constant speed reducing braking, and the overflow valve achieves constant torque second-stage braking; and when the previous type loses efficacy, the previous type is closed in a redundant manner, and meanwhile, braking is converted into the next type in a redundant manner. During safe braking, a pipeline needing conduction achieves redundant conduction through two electromagneticvalves connected in parallel, and a pipeline needing to be blocked achieves redundant blocking through the two electromagnetic reversing valves connected in series. During safe braking, a plurality of channels exist, each channel is redundant, if each channel has the transposition fault of one electromagnetic reversing valve, safe braking of the time can still be completed, and if the transposition fault of the electromagnetic reversing valves is diagnosed, alarming is performed or locking is performed for next-time vehicle starting.

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] "Mine Hoist Troubleshooting and Technical Transformation" published in July 2013, page 175 Figure 4-3 In the E141 hydraulic station shown in 8, although the two electromagnetic reversing valves G1 are connected in parallel but not redundant, how can it be called a parallel redundant oil return channel? Two electromagnetic reversing valves connected in parallel on one oil return channel, one of which h...

AI Technical Summary

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 from the brake 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 problems in the existing hydraulic station of the hoist: (1) The braking brake group and the power-off proportional overflow valve need to be blocked when braking safely. Two parallel electromagnetic reversing valves cannot achieve redundant blocking. 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 without retaining The oil pressure value required for constant deceleration braking will lead to constant deceleration braking failure, and may cause rope breakage or slipping accidents; (2) When braking safely, the brake group and the overflow valve need to be connected in two series The electromagnetic reversing valve cannot realize redundant conduction. If the first electromagnetic reversing valve has a transposition failure in the middle position and does not conduct, it will block the passage of the pressure oil of the brake group to the relief valve, and the system will 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; (3) only one proportional directional valve is not redundant, and the proportional directional valve is The core component of constant deceleration control, if the proportional directional valve fails to discharge oil to the fuel tank, the oil pressure drops to zero and brakes quickly, failing to maintain the oil pressure value required for constant deceleration braking, resulting in failure of constant deceleration braking, which may occur Broken or slipped rope accident

Images