The application of PLC in the steel automatic stacker

1 overview of hangang section steel rolling factory automatic stacker equipment has been applied, meet the needs of the steel automatic stacker. To reduce the labor intensity of workers, improve the quality of steel packaging, enhance market competitiveness, improve the economic benefit and social benefit to create a good condition. In the steel industry in our country, the steel packaging quality, relatively poor compared with the industry abroad are artificial stacking. There are many disadvantages: 1) The production efficiency is low, make the rolling production and packaging, causing large inventories in the middle. 2) The intensity of labor is big, the high cost of artificial. 3) Poor quality of packaging, it is difficult to achieve bite stacking, closely flush. The set is very good to solve the above problems. This production line adopts PLC to realize automatic control, the pallet methods of channel steel is root/layer 3, 8 layer/crib, Angle of 3 root, two root alternating stacking structure, stacking velocity is about 5 min/bundle, stacking steel varieties of # 14 ~ # 20 slot, 12. 5 # 14 ~ # Angle steel, specified length range 10 m or less. Since the use effect is good. Fully meet the national standard GB2101 - stacking packaging 89. 2 equipment steel structure designing automatic stacking production line, mainly composed of the following equipment: 1) Several groups of roller conveyer; 2) 1 #, 2 # steel machine; 3) Chain moving steel inspection bench; 4) Change collection agencies and steel processing platform; 5) Stacking moving steel platform; 6) Grouping institutions; Positioning; 7) Translation stacking agencies; Turnover stacking mechanism; 8) Crib lifting mechanism; 9) Steel buttress compaction mechanism; 10) Lifting steel roller chock transportation. Choose notice o roller roller conveyer, when a successive a few motor fails, do not affect the use of other motor. 1 #, 2 # dialing pause with steel chain claws pulled lead; The chain ( Flat rate) Speed of 0. 34m/s。 Change rule of steel collection agencies choose pneumatic; Grouping, positioning, translation, flip agencies, lift, compaction mechanism adopts hydraulic drive. Motor are all made of communication, control the KJW - 300 n non-contact switch cabinet. 3 design of the control system of the OMRON company type C60 PLC, the control system sensor distribution in limit position of each action. In the PLC automatic control system, the main detecting element are: photoelectric switch, electromagnetic induction approach switch, button operation, etc. , a total of 32 input signal. Execution parts mainly include: roller motor, grouping and positioning, the translational motion mechanism, flip agencies, buttress Taiwan hoist, steel pile compression institutions such as 28 dots. Production line in the actuators and the large number of species and detecting element, PLC controller for the selected models need to be able to meet its need to control system I/O point distribution, and empty out a few more appropriate input point, so as to meet the needs of production improvement. In order to improve the reliability of steel automatic stacking line operation, ensure the man-machine combination under the way of work safety, in addition to use high-quality components, has adopted many effective protection measures. For example: in order to guarantee the steel in the process of running reliability, set the marshalling limit photoelectric switch and the limit of electromagnetic induction is close to switch, the PLC controller signal input, to decide whether the next program starts, or implement the emergency stop. Besides, there are variable frequency over-current protection, hydraulic system pressure detection, fault indicator, zero protection, safety alarm, etc. In order to improve the maintainability of the system, and sets the status information on the operation panel, according to the instructions and fault and is equipped with a manual device, when automatic failure, reliable manual operation to realize the pallet. Inside the PLC system set up automatic fault diagnosis function. When a failure is automatically stop, realize self protection, and have the flashing lights on the PLC monitors, reminded the point of failure. To facilitate the operation, reduces maintenance time, in the PLC control software, clever use of HR to keep type relay and counter properties, makes palletizing production line can stop at any time, after troubleshooting, don't need to manually adjust can continue to work normally. The working process of the control system is shown in figure 1. Figure 1 the working process of the control system design points 1) 4 Guarantee the normal work of the continuous automatic stacking system, after straightening steel check on the test bench, shall ensure that there is a certain space between steel and steel, this requires 1 # dial every finished a piece of steel, steel machine check the chain moving distance on the bench, to ensure the inspection of steel, change 'collection of steel, steel, single or double root into the roller conveyer. 2) Due to channel steel in the steel stacking requirements bite together, each layer of three phase Angle steel piling need two root, after the first three flip through translation and alternating movement complete grouping therefore need a reliable, accurate, and positioning. In order to meet the different varieties, specifications of steel piling. Of which only used in the production of Angle steel, Angle steel group in the channel steel production to the landing position to play, and then stop Angle steel group control cabinet, in order to avoid wrong operation. 3) Due to steel piling 0 ° ~ 90 ° in the process of turning steel equipment gravity and flip the power in the opposite direction, and at 90 ° ~ 180 °, sections and gravity the same as the reverse power equipment, so there is a downward acceleration, if left alone to flip, flip the process of violent shaking, easy to cause accidents, so that the equipment can't normal use. So in use in the design of the hydraulic valve for pressure, to solve the above problem, make the equipment in turning process is very smooth. System working pressure for 8 ~ 10 mpa. Can be adjusted according to actual situation. 4) Steel piling, buttress each put a layer of steel, must fall in a certain height, automatically ensure the crib flat-screen always stay in the original height.
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