Research And Application Of A Crane Hoisting Mechanism Control System Reform

Bridge crane is a commonly used material handling equipment, safety and reliability is to ensure that the premise of material transport at high altitude, while the safety of ground equipment and personnel is essential too, with the increasing use of time and the relay-contactor contacts control the performance degradation, the bridge cranes increasing the probability of failure at work. After a long-term use a factory of a 30/5t existing bridge crane appear in the production of transient slip hook, mechanical noise, micro control difficult, equipment vibration, component burn, symptoms such as sudden stop and so on, a serious threat to the safety of equipment and personnel.This paper studied the factory 30t/5t bridge crane hoisting mechanism of the electrical system transformation, AC frequency control technology and PLC control technology, the lifting of the bridge crane electrical control system for technological transformation, without changing the bridge crane traveling mechanism construction of the corresponding transformation program, selected 8 poles 750r/min the YZBF250M-8-based hook cage motor drive motor; 6 poles 1000r/min the YZBF160L-6 Vice hook cage motor drive motor; select FR-A540-45W inverter-based motor speed control hooks; FR-A540-15W of drive motor speed for the auxiliary hook; Select Mitsubishi FX2N-80MR PLC lifting system for the control alternative to the traditional PQR-type magnetic-screen control.According to the selected bridge crane hoisting mechanism drive motor, the inverter control signal requirements, control process in accordance with the requirements, design principal and vice hook the drive wiring diagram. PLC according to the selected input and output ports and define the wiring diagram, PLC programming designed to hook ladder; hook when working under the control requirements and processes, the preparation of the corresponding PLC control program. With the purchase of the motor, inverter, PLC and field overhead crane hoisting mechanism on-site construction, completion of the appropriate connections, and electrical systems are tested and safe commissioning, and set the PLC control program and associated parameters, the results show that the bridge crane commissioning a successful transformation results, achieved the expected results.This paper to AC inverter technology and PLC control combined, solve the control problem of the traditional equipment, enhance the control precision of traditional equipment, mining potential of the traditional mechanical equipment, extend the life of the equipment, the results of this project and practice of technological transformation of similar equipment with reference value.