| With the development of China’s economy,the construction industry in our country isdeveloping rapidly，the awareness of people has been improved，precoated steel is more andmore widely used in the construction industry. The application of precoated steel in householdappliance industry has been very common in developed countries, but in China is still in theinitial stage. Currently, only some of the large state-owned enterprises and foreign-fundedenterprises are starting applying precoated steel in their products. But with the improvement ofthe people’s awareness of environmental protection and consumption level, as well as China’shousehold appliance industry continues to develop, sales of precoated steel in China’s householdappliance industry is bound to improve. This provides a broad market prospect for theapplication of precoated steel.Firstly, based on the actual project of “design and debug of automatic control system ofprecoated steel product line for Sichuan Casey”, this paper introduces the production process andcontrol requirements of the precoated steel product line.Secondly, in order to make the tension of each working section to meet the controlrequirements accurately and rapidly, ACS-800series inverter has been chosen in this paper, andits power supply is in the form of common DC bus. With the direct torque control technology,ACS-800series inverter provides a favorable condition for the realization of the accurate andstable tension control.Thirdly, in order to control the operation of the whole product line, the Siemens S7-400PLC is chosen and the PLC program is designed in structured programming method in this paper.INTOUCH configuration software has been used to monitor the operation conditions of theproduction line realtimely and visually.Finally, a constant tension control algorithm has been proposed though analyzing thechanges of the output torque of uncoiler, coiler and vertical looper in the production process,and realized with the above automatic control system. |
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