Anti-skid mine hoist constant deceleration braking electro-hydraulic control equipment

Abstract

The invention belongs to the hoist brake control technique and provides a non-slip constant deceleration brake elector-hydraulic control set for a mine hoist. The set comprises a three-phase UPS (uninterrupted power supply) (3), a linear hydraulic station (4) and a dual-closed-loop adjusting device (2). The linear hydraulic station (4) comprises two electro-hydraulic pressure regulators (4.1), a safety electromagnetic valve (4.10), a hydraulic valve (4.7) and an oil pump (4.3). The electrical signal input ends of the electro-hydraulic pressure regulators (4.1) are connected with the output end of the dual-closed-loop adjusting device respectively through a normally closed contact and a normally open contact of a relay contactor in a switchable manner; the oil circuit output end of the electro-hydraulic pressure regulators (4.1) is connected with an oil circuit of a disc brake (7) through the hydraulic valve (4.7) and the safety electromagnetic valve (4.10). The non-slip constant deceleration brake elector-hydraulic control set allows constant deceleration braking for the mine hoist and prevents a wire rope from slipping or creeping during safety braking.

Description

technical field [0001] The invention belongs to the brake control technology of a mine hoist, and in particular relates to a mine hoist constant deceleration brake electro-hydraulic control device capable of anti-skid. Background technique [0002] The brake of the mine hoist includes working brake and safety brake; the safety brake is the brake of the emergency stop of the mine hoist or mine hoist winch when an abnormal situation occurs during operation. At present, the methods of safe braking in the prior art include primary braking, secondary braking and constant deceleration braking; among them, primary braking is rarely used; secondary braking is a traditional safe braking method, It belongs to constant torque braking, and adopts the secondary braking hydraulic station as the oil supply device of the disc brake; the secondary braking process is to divide all the braking torque required by a hoist into two stages for braking; however, the secondary The main disadvantage...

AI Technical Summary

Problems solved by technology

At present, the methods of safe braking in the prior art include primary braking, secondary braking and constant deceleration braking; among them, primary braking is rarely used; secondary braking is a traditional safe braking method, It belongs to constant torque braking, and adopts the secondary braking hydraulic station as the oil supply device of the disc brake; the secondary braking process is to divide all the braking torque required by a hoist into two stages for braking; however, the secondary The main disadvantages of stage braking are as follows: 1) During safety braking, the braking force is applied in two stages, and the braking process has a large impact on mechanical equipment including hoisting wire ropes and derrick or well tower facilities, posing safety hazards; 2) Lifting heavy objects There is a significant difference in tension between the hoisting wire rope and the lowering process. For the same two-stage brake hydraulic station used, it is necessary to take into account the two significantly different working conditions of lifting heavy objects and lowering heavy objects. The effect is not good; some are equipped with a dedicated constant deceleration hydraulic station as a disc brake oil supply device. The known constant deceleration hydraulic station is equivalent to adding an oil source for constant deceleration control on the basis of the secondary brake hydraulic station. And the electro-hydraulic pressure regulating link, although it overcomes some problems existing in the secondary brake hydraulic station, it also has some shortcomings, such as: 1) The oil source and electro-hydraulic pressure regulating device used in the working braking and constant deceleration braking process are Separated and repeated settings, the constant deceleration hydraulic station has a complex structure and is difficult to debug. Although the braking effect is improved, the repeatability is poor; 2) Safe braking is a random event, and constant deceleration cannot be achieved frequently in the daily production process The functional link or unit is used for performance verification. When the constant deceleration function needs to be put into use, the constant deceleration function link or unit may fail, and there are also other potential safety hazards; 3) In the process of safety braking, there are There are potential safety hazards in the switching process between two-stage braking and one-stage braking; 4) Regardless of whether a two-stage brake hydraulic station is used or a dedicated constant deceleration hydraulic station is used, two Even if the hoist stops in place normally, there will often be a large vibration and sound at the moment of parking; 5) There may be serious wire rope slipping and creeping in the process of safe braking and parking Phenomenon

[0003] If the wire rope slides and creeps seriously, there are also potential safety hazards, and at the same time affect the accuracy of lifting the container to stop in place, affecting the lifting efficiency and safety

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