Double-stage braking hydraulic station with high-reliability scavenge oil and control method thereof

Abstract

The invention discloses an oil-return secondary braking hydraulic station with high reliability; a plurality of electromagnetic reversing valves are arranged on the pipeline that communicates an A-group braking gate and the heat accumulator and the hydraulic reversing valve; a permanent-opening adjustable throttling valve is arranged at the inlet pipe and the outlet pipe of the A-group braking gate, and a permanent-opening throttling valve is arranged at the inlet and the outlet of the B-group braking gate; the pipeline of the B-group braking gate is provided with two electromagnetic reversing valves that are communicated with an oil tank; the electromagnetic valves are provided with an on-line monitoring reversing position sensor. Through the multiple insurance braking valve, the braking gate can be reliably communicated with the heat accumulator; when the oil cannot be returned for the electromagnetic valves and the electric-liquid voltage-regulation device have malfunctions, the pressure oil is ensured to be returned to the oil tank through the permanent-opening throttling valves, thereby realizing the high-reliable oil-return brake of the secondary braking in the well while guaranteeing the normal braking. The hydraulic station has compact structure, is easy to be operated, is convenient to be repaired, has simple method, is safe and reliable, and has good braking effect, and has wide practicability.

Description

technical field [0001] The invention relates to a high-reliability oil-return secondary brake hydraulic station and a control method thereof, and is especially suitable for high-reliability oil-return brakes of the hoist disc brakes of large-scale coal mine equipment, and is also suitable for other hoist disc brakes or belts Conveyor disc brake braking. Background technique [0002] The hoist container has a high speed and high inertia in the well, and the secondary brake is a safety brake in this state. If all the brakes brake at the same time to make the hoist container suddenly stop, it will cause the steel wire rope to be subjected to excessive inertial force and cause damage. In case of major accidents such as broken rope and severe skidding, the secondary braking in the well is particularly important. There are two types of secondary braking in the well: one is to use two groups of brakes A and B with equal numbers, and the oil pressure of group B brakes quickly retur...

AI Technical Summary

Problems solved by technology

Although the two-stage brake hydraulic station can achieve two-stage braking well, but when the brake brake returns oil to brake, once the electromagnetic reversing valve G3 has a transposition failure, especially when it is stuck in the middle position, at this time B The oil pressure of group A brakes cannot return to zero, resulting in failure to brake and causing accidents; in addition, once the electromagnetic reversing valve G4 has a transposition failure, group A brakes 8 cannot be connected to accumulator 7, resulting in Two-stage braking cannot be achieved; the pressure oil of group A brakes can be braked by returning to zero through the electromagnetic reversing valve G5 and electromagnetic reversing valve G6 set in parallel. It seems to be double insurance, but in fact the electromagnetic reversing valve During the operation of G5 and electromagnetic reversing valve G6, if one of them fails, it cannot be found, and another failure will cause an accident; Valve G6 does not move frequently, and it is prone to mechanical failure if it is idle for a long time

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