| The bridge crane carries a kind of typical equipment in the supplies system , so it have extensive function in the activity of producing enterprise ,so it is important to improve the bridge crane operational efficiency, guarantee the safe reliability to be operated, reduce the cost of the supplies carrying . But the traditional bridge crane control system mainly adopts relay and contactor to control bridge crane , adopt the methods of wire winding bunch of resistance to start and adjust speed of motor, the control system have many disadvantages ,for example : dependability is bad, it is complicated to operate, fault rate is high. the electric energy is wasted greatly, efficiency is low. Carrying on the research to the bridge crane control system has realistic meanings, it is a subject for research of relevant experts and scholars' both at home and abroad too.To the question that exist in the bridge crane control system , the paper apply programmable controller and frequency converter on control system of bridge crane , have carried on deeper research, in relevant respects.1. According to the operation characteristic of bridge crane, bridge crane control system adopt industry touch-sensitive screen control the system of bridge crane frequency conversion, this system mainly include location going to machine (industry touch-sensitive screen system ), the next machine (PLC control system )and frequency conversion system.2.The configuration software can customize the special function software platform for users, utilize its good man-machine interface and communication capacity, can develop the friendly man-machine interface on the PC , download the interface into the touch-sensitive screen , make staff member can set parameter , start or stop electrical motor and at the same time implementation fault alarm.3. PLC system adopts the SIEMENS Company products, can control the crane cart , car operation direction and change speed ; To rise , lower cliver direction and change speed , can measure each motor trouble phenomenon and send this to touch-sensitive screen of industry to show at the same time, have reduced traditional electricity - Contact-type control system of intermediate link . it reduce the hardware and control line, has improved systematic stability, dependability greatly.4. Prevent the heavy object from gliding for being more effective, rise organization of crane add one rotate encoder , PG count mould change combine PLC with close ring system , make clivers more steady , more reliable . The experimental result indicates , adopt this control system, it is reliable to make the bridge crane work, easy to use, have dynamical shown function , energy-conservation is effectual. |
