Application of PLC in air duct production line
I. Introduction
With the large-scale application of central air-conditioning, CONTROL ENGINEERING China copyright, the demand for pipes for heating and ventilation has also increased greatly. The so-called air duct is a pipe system used for air transportation and distribution, which is widely used in commercial public places such as supermarkets, shopping malls, exhibitions, and theaters. The air duct production line is composed of a feeding frame, a leveling beading machine, a punching mouth and a punching corner hydraulic shearing machine, a hydraulic shearing machine, and a hydraulic folding machine.
2. System Introduction
The requirements for the process are as follows: the starting sequence of the equipment is to open the oil pump main valve and the oil pump, then feed, and then use the steel roller controlled by the servo motor to level the ribs. The folding machine performs folding, and the hydraulic shearing machine cuts off the formed duct.
The action requirements are: oil pump start → open main valve of oil pump → origin of fixed mode → servo start → cutting edge → punching small square hole → bending → cutting
3. Hardware system:
3.1 System composition:
This system consists of one Advantech 610L industrial control computer, the upper computer configuration software is Kunlun on-state, FATEK PLC host FBs-24MCT, digital expansion module FBs-8EY, Yaskawa servo driver and servo motor .
As shown below:
3.2 Overview of Yonghong PLC positioning control:
FATEK FBs series PLC integrates NC positioning control into the SoC chip of FBs-PLC, so that PLC + NC control is integrated, sharing resources and eliminating data exchange between the two systems. The maximum output of a single machine is 4 axes, the highest frequency is 200KHz (MC) or 920 KHz (MN), and it can be used for multi-axis linear tweening and dynamic tracking.
4. System software design:
4.1 Technical difficulties:
Each air duct needs to be bent 3 times, played with a large square die 2 times, played with a small square die 3 times, and cut once, for a total of nine actions, and when each action is executed, the servo must be stopped. Automatic start, the distance transmitted by the servo is different every time, the distance traveled by each step and the action after stopping should be determined according to the size of the air duct, according to the calculation control engineering network copyright The movements are certain to cross regularly, and the pipes of different sizes cross in different ways. For example, when making smaller pipes, the three small square molds are all laid, and the bending action is not once. Some tubes are made with two square molds, and the bottom is bent once, and then a small square mold is bent, and then bent twice.
4.2 Design ideas:
It takes 9 mechanical actions to make a complete air duct, and the servo automatically starts and stops 8 times accordingly. The running distance each time depends on the width and height of the set tube. But the number of mechanical movements is fixed, we can calculate the total distance that the servo walks , 3 distances can be calculated by the formula, and these 3 distances correspond to the action of playing a small square model. In this way, find the length of these nine actions, and then determine their corresponding actions.
4.3 Picture design of upper computer:
The control software of the host computer adopts the configuration software design of Kunlun Tong State Company, as shown below:
5. Project operation:
It can be seen from the operation of the system that the production accuracy and stability of the air duct production line have been significantly improved. Its maximum working speed is 10 m / min. The length error is ± 0.5mm. It can produce more than 0.25M of "", "" 'and "air ducts, the number can be set arbitrarily.
In the case of automatic feeding, the auxiliary material of any length is opened. When the set quantity is finished, the air duct machine automatically stops.
6. Conclusion:
This system adopts the positioning control function of Yonghong PLC, which enables customers to reduce the development cost of new products and shorten the development cycle. The stable operation of the system not only reduces the labor intensity of on-site operators, but also improves production efficiency, and has high practical and popularization value.
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