Design of Auto Height Check Machine Control System Based on PLC to Improve Quality the Complete Piston Rod Assembly Process
Keywords:
non-return valve, a special washer, leaf valve, mesin auto height check, plcAbstract
This paper discusses research on improving the quality of the complete piston rod assembly process which is part of the OCU (Oil Cushion Unit) or rear assembly process. The complete piston rod functions to regulate fluid circulation when OCU experiences compression and rebound. The complete piston rod assembly process is a process of combining piston rods, dust seals, oil seals, rod guides, sub springs, valve stopper, leaf springs, non- return valves, leaf valves, special washer, pistons, and piston rings. A non-return valve, leaf valve, and special washer are thin circular plates. The part that has been assembled is checked in number and composition according to the standard. The problem in the complete piston rod assembly process is when the operator counts the number of non-return valves, leaf valves, and special washer according to the required amount. This is because of its very thin size and stickiness. Errors in the number of non-return valves, leaf valves, and special washer assembled will cause the complete piston rod to reject. Therefore, this study aims to provide a solution to these problems, namely designing an auto height check machine. This machine functions to check the number of non-return valves, leaf valves, and a special washer that has been assembled accurately. The auto height check machine control uses the Omron CJ1M-CPU11 PLC (Programmable Logic Controller) that is communicated with the Omron NS5-SQ10B-V2 HMI (Human Machine Interface). Input devices used are pushbuttons, selector switches, state switches, reed switches, emergency stops, and smart sensors. The output devices used are tower lamps and solenoid valves. Checking the number of non-return valves, leaf valves, and special washer using smart sensors. The result obtained after the existence of the auto height check machine is the reduction in the number of the complete piston rod which rejects from 5 pieces per day to 0 pieces per day.
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