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common problem

Release time: 15:13, May 6, 2020

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   Winch explosion proof lifting Another important reason why the oil temperature of the hydraulic system is heated is the heat generated by the sliding film of the transmission shift brake pad. When the transmission brake pads begin to engage and separate, they produce short slipfilms, which are inevitable and cannot be overcome by the machine. At this time, the hydraulic transmission oil will have the function of lubrication and cooling. In other words, the heat generated by the sliding film must be transferred to the hydraulic transmission oil. Once the time of sliding film is too long, the working temperature of hydraulic transmission oil will rise rapidly. There are three reasons for the longer sliding time of single transmission shift brake pad

(1) the friction brake pad is damaged more seriously, which reduces the friction of sliding film, and can not fully mesh under high torque.

(2) the pressure of the variable speed hydraulic cylinder does not reach the fixed value, so the brake pad is not clamped firmly. The seal failure in the system is the main reason for the decrease of working cylinder pressure. Due to the seal failure in the system, the internal leakage or serious wear of the hydraulic pump will be caused.

 Explosion proof hoist

(3) the transmission oil filter is blocked, resulting in poor oil flow, insufficient flow and slow pressure build-up.

The main purpose of the closed-loop control system of explosion-proof hoist is to solve the problem that the existing ventilator can not adjust its working state according to the site environment, which wastes electric energy and has hidden dangers.

The closed-loop control system of explosion-proof hoist consists of fan, frequency converter and programmable controller. PLC is equipped with feedback signal acquisition unit, fan, frequency converter, logic controller and negative feedback acquisition unit. Closed loop control unit. The system can collect the data of mine gas concentration and fan air pressure in real time, control the fan speed closed-loop, improve the intelligent degree and save the electric energy. The fan is equipped with over-voltage, under voltage and overheating protection devices. When the fan unit overpressure, negative pressure or temperature is too high, it can automatically switch to another fan, so as to realize the intelligent switch of the fan in case of failure, so as to realize the real-time ventilation of the fan under the mine, so as to improve the * * coefficient of the underground workers.

Composition of frequency conversion closed-loop control system of explosion-proof hoisting winch: the closed-loop control system of explosion-proof hoisting winch is usually composed of fan, frequency converter, programmable logic controller, gas concentration sensor, pressure transmitter and temperature sensor. Responsible for signal data collection. The closed-loop control system of explosion-proof hoisting winch includes at least two groups of closed-loop control units composed of fan, frequency converter, programmable logic controller and signal acquisition unit. The programmable logic controller of each closed-loop control circuit constitutes a interlock.

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