In the process of industrial production control, PLC is widely used. Applications in the fields of machinery manufacturing, petrochemicals, metallurgy and steel, automobiles, and light industry have all been developed by leaps and bounds, especially in the metallurgical and chemical industries. The electroplating production line of a smelter uses a special crane, and the crane is equipped with a lifting hook. The crane and the hook are each driven by an electric motor. The forward and backward of the crane and the lifting of the hook are all controlled by the corresponding limit switch 3 ( 3. Positioning. There are currently three slots on the production line, which can also be easily expanded according to production needs and process requirements. The system has two working modes: manual and automatic cycle. The manual mode is used for equipment debugging or single-step action in the event of a failure. Or adjust the equipment to the original position. In the automatic mode, when the electroplating production line is not working, the crane and hook are in the original position. After the workpiece is installed, just press the start button, the hook will rise to the upper limit, and the hook will stop running ; The crane then drives the hook to the plating tank to the right, and the crane stops; then the hook descends and drops to the lower limit, that is, the workpiece is put into the plating tank, lifted after electroplating for 150 seconds, and parked for 30 seconds to allow the plating solution to flow back from the workpiece to the plating tank. Then drive to the right and go to the recovery tank, the hook is lowered, put the workpiece in the recovery tank to soak for 26S, lift it and park for 18S, then drive to the right to the clear water tank, put the workpiece in the clear water tank for 28S, and finally After lifting and parking for 15 seconds, the vehicle travels left to the left limit, the hook is lowered to the original position, and the whole process of electroplating a workpiece ends. The system was originally controlled by a relay contactor system. Due to many faults, it is inconvenient to adjust the operating parameters, and it does not have the monitoring function, which brings a lot of inconvenience to production and operation management. So instead of using PLC and touch screen for joint control, it not only improves the automation degree of control, but also can use the touch screen to modify the time required for control during system operation. 2500 - 3500 Puffs (included) Shenzhen Zpal Technology Co.,Ltd , https://www.zpalvapes.com