The Design Of Safety Control System For Mine Flameproof Electrical Switch

As an important part of the underground power grid,the safety of mine flameproof electrical switch is an important part of the whole coal mine safety.The environment of underground coal mine is complex and the failure rate of mine flameproof electrical switch is high,it needs frequent inspection and maintenance by maintenance personnel.Therefore,improving the safety of mine flameproof electrical switch can guarantee the life safety of maintenance personnel and the safety of mine electrical equipment.The service life and the rapid restoration of the whole coal grid are of great significance.In this paper,taking the mine flameproof high-voltage distribution equipment as an example,to design a mechanical anti-misoperation locking structure,which integrates the interlocking of front door,circuit breaker,earthing switch and back door.The structure improves the anti-misoperation locking of single flameproof high-voltage distribution cabinet,which meets the requirements of electrical "five preventions",and avoids the risk of electric shock caused by misoperation during maintenance So as to reduce the threat of large area blackout.On the premise of meeting the requirements of "five prevention",this paper uses the electric earthing switch instead of the traditional grounding wire,and uses the electric circuit breaker truck instead of the traditional hand-held circuit breaker truck,which not only improves the safety of the mine flameproof type,but also improves the efficiency of the circuit breaker propulsion and withdrawal,and reduces the workload of the maintenance personnel.In this paper,to design three-dimensional modeling for the mechanical structure of mechanical anti-misoperation locking by Solid Works,and using Solid Works motion to analyze the movement of mechanical anti-misoperation locking structure.Using Solid Works simulation to analyze the force on some parts of the interlocking mechanism.Finally,the correctness and feasibility of the design are proved by building a test bench.At the same time,this paper designs the control system of the electric circuit breaker truck,which uses the speed and current double closed-loop method to realize the control of the permanent magnet DC motor,the fuzzy PID control algorithm to realize the precise control of the propulsion and exit of the electric circuit breaker truck,the photoelectric encoder to measure the running speed of the electric circuit breaker truck,the Hall current sensor to measure the current of the permanent magnet DC motor,the field control and the remote control There are two ways to realize the control of circuit breaker truck: the field control adopts the button and the LCD screen to realize the human-computer interaction,and the RS485 communication to realize the remote control.The experimental results show that the mechanical anti-misoperation locking,which is designed in this paper,has reasonable structure,high reliability and good application effect,and meets the requirements of electrical "five prevention".The field control and remote control of the electric chassis car not only shorten the time of propulsion and withdrawal,but have high control precision and good stability,which can effectively protect the flameproof high-voltage distribution cabinet and improve the safety of the system.