PLC application in the constant feeder

PLC controller application in the constant feeder newmaker welcome to e hall hall hall 8 mixer/packing machine mixing machine, plastic mixing machine, feeding machine, packing machine, feeding machine,. 。 。 A, quantitative feeding machine for material constant feeder is ideal equipment of continuous weighing feeding, is weighing measurement and quantitative control as one of the high-tech products, this paper mentioned feeder is auxiliary plastic industry. Apply to injection molding, blow molding, extrusion and filling and packaging equipment, feed type suitable for pellet and powder materials. Figure 1 - 1 constant feeder equipment picture 2, PLC product introduction motor co. , LTD. , founded in 1992 by a group of engineers design work for many years engaged in PLC controller was founded in Taiwan. Launched in 1993, FBE and FBN series products, launched in 2003, FBs new series of products by the industry praise. This equipment is mainly used weighting function, and the PLC for FBs - has been developed specially for the weighing function 1LC。 According to the customer feedback the module performance is very excellent, programming is convenient. Figure 3-3, system control requirements 1 the analysis of the constant feeder as shown above, the feeder has 4 - 6 cylinder, by setting the weight of the single weighing, and setting the proportion of each type of material, material 1 set into the cylinder when the weight of the first, after feeding door closed material 1, 2 began to feed material, at this time so on each kind of material will be in accordance with the proportion in turn into the weighing unit. When weighing after reaching the total weight of a single, discharging door open, this batch of the total material to the mixing unit and continuous mixing. When the equipment to production after that day, and will stop feeding. Technical difficulties: as the inlet from the weighing sensor location has 40 cm distance, when the sensor receives the weight to shut down when feeding door, air also can stop at this time a lot of material into the weighing unit, since each inlet of different size, and adjust, so the mixture of uneven. This requires that the system should have a good compensation function, if the last more than a few grams of material, again next time feed automatically under a few grams, so that is can solve the problem of the precision of mixing. Four, the solution in view of the above control requirements, combined with related products technical characteristics of PLC, I bring forward the method of using PLC to realize, FBs - 1 lc is very precise weighing module, and response time can be from 5 hz - - 480 hz, sensitivity from 2 mv/V - ; 20mV/V。 Can meet the commonly used control occasions, can range from a few grams to several tons. 4. 1 control part of the composition of the main product features specifications: 1. Main controller: FBs - 24MAR2- AC 2。 Weighing module: FBs - 1 lc3。 The man-machine interface: UNICON 7 inch screen 4. Desmond tutu 4-2 system structure 1 4 system structure of the system. 3 electrical wiring tutu 4 - 2 system electrical wiring diagram, system control program 5 five. Control process tutu 5-1 1 control flow diagram 5. Figure 5-2 weighing initialization program 2 the weighing unit configuration Y10 - in this part of the program Y17 is for FBS - 1 lc configured to Y10 to Y17 reset all configuration for measuring range of 0 - weighing module 10 mv, conversion rate for 5 hz, the average number of 0. Through FUN33 instruction to achieve the function reset and calibration of the weighing unit. Figure 5 - 3 electronic said zero and calibration 5. 3 pattern 1 work program this part is to determine whether to set the weight of materials if not up to it, if more than a quantitative jump to the next step, save the weight of a single, jump to the next a blanking material, so on. And when a material set to 0, the proportion of direct automatic skip this material cutting operations, and save the relevant production information. Figure 5 - 4 work pattern 1 part program 5. 4 model work program mode 2 work process is carried out in accordance with the blanking time set to blanking operation, such as setting material 1 blanking time for 2 s, material cutting time is 3 s, 2 material 3 blanking time for the 4 s. Constant feeder to feed on in time. Figure 5 - 5 work pattern 1 part program. Figure 5-5 automatic compensation program 6 work pattern 1 part program automatic compensation is the difficulty of the program, program design core idea is: save the last time the shoes with a quantitative difference between, if the last cutting down more, the next time the material would have been a little under the corresponding amount. Considering the influence of the materials to control the stranded, after many experiments found objects to control retention after blanking material again many times about 20 g, so after setting percentage, material under the standard value minus 20 g, budget into value within the program. To weighing module to configure, and speed up the transformation of the weighing module, the program to adjust weighing module as the highest response frequency of 480 hz. Figure 6-6, the debugging process Figure 6-1 control cabinet of the related pictures 2 pictures the equipment debugging cycle longer debugging process, only the automatic compensation function, after the scene debugging the countless times to summarize out certain experience, from automatic control theory, the system belong to the big lag system, mathematical model of the system is very complex, can only be repeated experiments, summed up the certain rule to do big compensation system to achieve good control effect. Weighing module conversion rate at the same time also to the corresponding fast enough, in this way can control corresponding timely. Through continuous debugging clients satisfied with our control precision. FBS series of FATEK PLC has many characteristics of the module, use rise is very nice, such as voice module, voice module, temperature control module, these very targeted, the very characteristics, and high control precision, convenient programming, the advantage is incomparable by other PLC controller.
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