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

Abstract

The invention relates to a redundant hydraulic station for constant deceleration safety braking by a proportional overflow valve and a control method thereof. The redundant hydraulic station comprisesan oil pump, a motor, the proportional overflow valve, an overflow valve, a one-way valve, an energy accumulator, a sensor for monitoring valve position, a brake group and electromagnetic directionalvalves. The redundant hydraulic station realizes safety braking by two forms of constant deceleration safety braking realized by the proportional overflow valve and constant torque secondary safety braking realized by the overflow valve. When the former safety braking form is out of order, the former safety braking form is redundantly closed, and meanwhile the next safety braking form is redundantly introduced. During safety braking, a channel needing to be conducted realizes redundant conduction by the connection of two parallel electromagnetic directional valves, and a channel needing to beblocked realizes redundant blocking by the connection of two serial electromagnetic directional valves. All channels taking part in safety braking are redundant. If a transposition fault occurs in one electromagnetic directional valve in each channel, the safety braking can still be completed. If the electromagnetic directional valve being out of order is diagnosed, an alarm is given or the nextdrive is locked.

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...

AI Technical Summary

Problems solved by technology

The electro-hydraulic servo valve 13 is the core component of the constant deceleration control. If the electro-hydraulic servo valve 13 fails, for example, it stops at the left position and no longer operates, the brake will continue to discharge oil to the fuel tank and the oil pressure will drop to zero and brake quickly, resulting in If the constant deceleration brake fails, there may be rope breakage or rope slipping accidents, and the system will automatically switch to the backup secondary brake mode if the constant deceleration brake mode fails as described on page 176 of this book.

[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 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 brake opening, which has not reached 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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