Reversible magnetic starter for underground coal mine electric power driving multiple rotary executing mechanism

Abstract

The invention relates to a reversible magnetic starter for an underground coal mine electric power driving multiple rotary executing mechanism. A test/working mode option switch and three buttons used for starting, closing and stopping respectively are arranged on a panel of a flameproof enclosure; a display unit of the reversible magnetic starter is a touch screen, an operation unit comprises the test/working mode option switch and the starting, closing and stopping buttons, and a signal collecting and processing unit comprises a signal processing plate and an analog-to-digital conversion module; and the units are connected with a programmable logic controller of a control unit respectively. The reversible magnetic starter has high reliability and high anti-interference capability, is used for the controls of the underground coal mine electric power driving multiple rotary executing mechanism such as local/remote control, starting, closing, stoping, self-hold/instantaneous acting, journey limiting, and torque limit control, performs comprehensive and real-time protection to prevent the faults of an unclosed contact point of a contactor, an overloaded electric current, a short-circuited electric current, lacking phase, under/over voltage, an earth leakage lockout resistance; and meanwhile, the touch screen can display, record, store, and check the working state or fault type and parameters.

Description

technical field [0001] The invention relates to an underground reversible magnetic starter for coal mines, in particular to a reversible magnetic starter for electric drive multi-rotary actuators in underground coal mines. Background technique [0002] With the improvement of the active level of mine mining, manual multi-rotary actuators can no longer meet the requirements of coal mine automation. Whether it is the construction of new mines or the transformation of old mines, large and medium-sized manual multi-rotary actuators are gradually being replaced by electric power. Driven multi-turn actuator instead. [0003] The drive of the multi-turn actuator is electric drive, and the magnetic starter realizes various functions such as opening, closing, stopping, local / remote control of the multi-turn actuator, and performs stroke, torque, and ground leakage of the multi-turn actuator. Lockout, overload, short circuit, phase failure, undervoltage and other protections. The re...

AI Technical Summary

Problems solved by technology

[0004] However, it is used underground in coal mines with harsh working conditions, complex electromagnetic environment, and strong interference signals. The existing reversible magnetic starters of multi-rotary actuators have the following problems:

[0005] (1) Reliability, stability and anti-interference are poor, and malfunctions often occur;

[0006] (2) The selection of local / remote control, self-holding / instantaneous operation can only be realized by disassembling the explosion-proof wiring cavity and changing the wiring after the power is turned off. It cannot be changed in real time according to the needs, which is not safe and convenient.

[0007] (3) When the AC contactor that controls the forward and reverse rotation of the multi-turn actuator fails due to problems such as voltage or magnetic coils, and cannot work normally, the reversible magnetic starter does not judge whether the AC contactor is closed or not, and checks it. Protective function

[0008] Due to the above problems, there are hidden dangers of accidents in coal mine production and safety, which need to be improved urgently

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