A rocker shearer peak load control system and control method

Abstract

A hydraulic control system used for treating peak load of a rocker arm coal mining machine belongs to the field of power control auxiliary systems of coal mining machinery, and comprises main motors, hydraulic pump motors, an energy accumulator, an auxiliary motor, a frequency converter, a transformer, a control unit, a hydraulic circuit, electromagnetic directional valves, a hydraulic pump, a one-way valve, a safety valve, a pressure sensor and oil tanks, wherein the main motors are connected with the frequency converter and the hydraulic pump motors; the hydraulic pump motors are connected with the hydraulic circuit; the energy accumulator is connected with the electromagnetic directional valves; the pressure sensor and the transformer are connected between the control unit and the main motors; the control unit is connected with the electromagnetic directional valves. The hydraulic control system has the advantages that energy loss is reduced; fluctuation phenomena of a power system are eliminated.

Description

technical field [0001] The invention belongs to the technical field of power control auxiliary systems of coal mining machinery, and is mainly applicable to the field of mining machinery including coal mining machines. Background technique [0002] Mining machinery is directly used for mineral mining and enrichment and other operations. Mining machinery is mainly composed of mining machinery, tunneling machinery, mine hoisting and transportation equipment, etc. Shearer is a kind of mining mining machinery, which is the main mechanical equipment of mechanized coal mining operation, and its main function is to drop coal and load coal. [0003] The working system of the shearer mainly includes a mechanical system, an electrical system and a hydraulic system. The hydraulic system is mainly used for auxiliary control, such as the height adjustment and movement of the drum. The working environment and load characteristics of the shearer are harsh. If a failure occurs, it will ca...

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Problems solved by technology

[0004] Due to the large moment of inertia of the shearer, there will be a large torque when it starts, brakes, and accelerates and decelerates. The motor of the shearer itself does not have a braking device. In practice, a braking resistor is often installed. By using these Excess energy is consumed to assist braking, which will not only cause energy waste but also cause the motor to heat up, so that the rocker arm of the shearer responds very slowly to starting braking or load changes, which will cause a large amount of energy loss and operation of the power system. action delay

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