Engine sealing ring packing line PLC control design

Engine sealing ring packing line PLC control design of southeast university Han Honghao welcome to e hall hall 9 automatic packaging machinery exhibition hall pillow packaging machine, vertical packaging machine, quantitative packaging weighers, transparent film packaging machine, filling packaging machinery. 。 。 1 packing line control requirements and control principle of the process flow for packing line: packing sheet heating - sheet suction molding - parts to build form a complete set, boxes, packaging - punching - product output line. System control circuit ( All drag and the electrical heating) And pneumatic system control two parts. Stop moving drag across the board, each service, and when they stop dragging the agencies. All the motion of the driven by cylinder. All drag each working procedure, in turn, into the next, dragging one location at a time, the length of the adopt stepper motor. The blister station cylinder as A, heat sealing station driven cylinder for D, use the same main control valve for synchronous movement; Location of the two sets of driving cylinder parts matching boxes for B and C, its action has strict interlocking requirements; The die cutting station cylinder as E, F, also use the same main control valve to control the synchronous movement. . The whole system according to design a logical sequence signal to perform and accept the command signal to complete the control loop, actuators, according to the signal in accordance with the order of action. This is characterized by strict order requirements of control system, the selection of PLC to control, it is very appropriate. The PLC with the method of circular scanning. A complete scan process is divided into sampling the input, the program execution and output refresh three stages. Sampling the input stage is where the state at the input into the corresponding register, equivalent to accept actuator feedback control system of the command signal, but the logic circuit control is executed in sequence step after action, feedback the command signal to the system, the control system according to the regulations of the command signal to the logic operation and then send the signal for the next step, the control is in the process and complete, and the PLC is centrally accept command signal at each stage, and its storage backup; The second phase is the program execution stage, PLC controller microprocessor to perform a detailed instruction, the corresponding command signal in the input status register callback, together with the original operation results, including logic, arithmetic operations, and the results will be sent to the output register. Because PLC is to perform a detailed instructions, characteristics of its operations to ensure the order of executing agency action, because of without considering any obstacle signal line operation, prevent the occurrence of institutions misoperation and greatly simplified; The third stage is the output refresh: output status register by PLC output part into the execution of the signal voltage or current signal output, drive actuators. 2 system control flow and control design according to the requirement of the packaging line automatic control, and the characteristics of the PLC control, control system design of the first step is to draw flow chart of control system, as shown in figure 1. Figure 1 automatic packaging line control flow chart can be seen from the diagram that the this is a variable, reciprocating working procedures. Location of the drive cylinder parts matching boxes B and C in a reciprocating motion in the loop three times. Each output of PLC controller machine control points in a scan ( Movement) Loop can only output ( ) Once, can't reuse. In the control design, corresponding to the B and C each one-way movement of main control valve, the arrangement of three output control points. PLC in order to execute each instruction as the main control valve of B and C cylinder will be reciprocating motion in an orderly fashion. Considering the control requirements, technical indicators, economic input and output interface to a certain amount of leeway, chooses OMRON company C series single-chip C - 40 p, the machine basic unit has 24 input, 16 points in the output, the output can be extended to 32 points. To address assignment will output and input interface, as shown in figure 1. Design control instructions arranged 13 timer. In addition to enable 19 intermediate relay, address code 1000 series. The timer and intermediate relay address just as special code in the control instruction ( Mnemonics) , into ladder diagram or the summary procedure, type of programming by PLC machine to perform operation. Draw PLC ladder diagram. As shown in figure 2. （ Limited space, ladder diagram abridgement) 。 Figure 2 system control ladder diagram author introduction: Han Honghao, male, graduated from southeast university power system and its automation. Department of electrical engineering lecturer, is mainly engaged in electric power system relay protection design work. References 1 Zhu Shanjun, etc. Programmable control system. Beijing: tsinghua university press, 19922 more than the thunder, etc. Electrical control and PLC controller application. Beijing: mechanical industry press, 19963, tsinghua university fluid transmission and control laboratory. Shanghai industrial university fluid drive and control laboratory. Pneumatic transmission and control. Shanghai: Shanghai science and technology press, 1985
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