Shearing machine control system
The shearing machine control system needs to complete the control of the working mechanism as follows:
1) Feed control, actuator
The workpiece is a feeding motor. By controlling the start and stop of the feeding motor, the feeding mechanism conveys the sheet material and stops the control of conveying the sheet material.
2) Tool shear control, the actuator is an electromagnetic clutch and an electromagnetic brake. By controlling the electromagnetic clutch in the main motor drive route, the control transmission mechanism drives the cutter to complete the shearing of the shearing machine, and the withdrawal is completed by the spring. In order to prevent the inertia from causing continuous shear, it is necessary to control the brake to shear once.
3) The shuttle car moves back and stops and the control device is the trolley motor. By controlling the start, stop and reverse rotation of the trolley motor, the feeding trolley is controlled to feed back and forth between the shearing machine and the next station.
Figure 3-4 Main circuit diagram of the shearing machine control system
Among them, 1) the actuator can use photoelectric and switching control. Since the programmable controller is a low-voltage DC output, we use the intermediate relay as the first-stage actuator of the controller output, and control the on/off of the high-power contactor through the electric shock of the relay, thereby controlling the start and stop of the AC motor. The electromagnetic clutch and brake in the actuator need to use a dedicated output drive control circuit.
The shearing machine control system originally used relay-contactor control, but the control system is more complicated. A large number of hardware wirings reduce the system reliability and indirectly reduce the working efficiency of the equipment. Better solved with programmable controller
This problem not only reduces the hardware wiring of the system, but also improves the reliability of the work. Moreover, when the machining process changes, it is only necessary to modify the program to adapt to the new processing requirements and greatly improve the work efficiency.