Air is PLC to average shearing machine automation renovation

Shearing machine is one of commonly used equipment machinery manufacturing and maintenance. With the sustained and rapid growth of our economy, society, the demand for all kinds of plank, growing on the accuracy of plate production put forward higher requirements; In addition, with the growing competition between enterprises and human resources costs rise, manufacturers in order to occupy the advantageous position in the competition, in addition to ensure the accuracy of plate production, on the efficiency of plate production are also put forward higher requirements. Based on the above, the plate production and processing enterprises urgently need to be high precision, high efficiency of production equipment. Shearing machine is one of the key production equipment plate processing enterprises, some well-funded companies, a huge sum of money to buy a new CNC shearing machine; In addition, there are quite a number of small and medium-sized enterprises hope that through technological transformation of the original equipment to meet the new requirements. Ordinary plate shears the main deficiencies are: 1. The machining accuracy is not high. The main cause of machining accuracy is not high, on the one hand, is the processing size by the operating personnel with ordinary steel rule manual measurement, precision is difficult to guarantee; Using asynchronous motor to drive the chain transmission mechanism on the other hand, this not only low positioning accuracy, and easy to cause the shear surface mechanical deviation, the deviation increase with the increase of processing plate width. 2. Tedious operation, easy to get wrong. Shearing machine need manual operation, shear action control must be completed artificially, takes up human resources, also easy to get wrong. 3. Large energy consumption, low efficiency of the shearing machine power systems generally use normal asynchronous motor, constantly in the process of cutting board start-stop, large energy consumption and low efficiency. According to these conditions, can undertake automation transformation of shearing machine, improve work efficiency and precision cutting board, reducing energy consumption. The basic requirement of control system design are as follows: 1, the shear function normally. In the normal processing before a product specifications, size, number of process can be set in advance. When a number of machine processing plate number set processing, machine is no longer normal processing. At this point, to set up processing parameters or entered into a state of temporary shear. 2, temporary shear function. Select this function does not need to set up processing parameters, can be processed. The state can be any size ( Must be within the scope of machining in machine) And any number of products. 3, setting processing parameters ( Machining size, quantity) 。 4, processing parameters real-time display. 5, additional features. Contains some dynamic debugging, automatic back to zero, pause, etc. Retrofit scheme one: as shown in the figure below, the automatic control system by frequency converter, photoelectric sensor, the man-machine interface ( Text display or touch screen, etc. ) , the air is A5 series PLC controller, etc. Figure 1 a retrofit scheme can use a text display or touch screen man-machine interface, can be displayed and set the current working status, number of cutting board, processing length and the parameters of the feeding velocity, shear rate and so on; Accept PLC controller control frequency converter, motor start, stop, speed control, etc. ; Photoelectric sensor is used to detect the length, behind the position can be adjusted by changing the photoelectric sensor processing length; Air is the A5 series PLC ( Hereinafter referred to as the A5) Is the core of the automatic control system, by which according to the parameters set by the operator through the man-machine interface control the movement of the whole system. System work process is as follows: electric starting system, the operator through the man-machine interface to set shear plate number, length of processing, feed velocity, shear rate and so on parameters and power parameters can be maintained. At the start of the normal shear, A5 control frequency inverter starting motor, drive plate, sheet when arrived at the location of the photoelectric sensor, photoelectric sensor signal feedback to A5, A5 parking control frequency converter, control analysis of the cutting knife cutting board, to complete a piece of material processing, and then the A5 control frequency converter, on to the next piece of material processing. During processing, the A5 can complete the processing quantity, shear frequency, feed rate, etc, and can be real-time display in man-machine interface. In the process of the control, the A5 material length by photoelectric sensor detection, and parking control frequency converter to control the length of processing. Because of the frequency converter control parking asynchronous motor has a lag, will cause certain deviation, in setting the location of the photoelectric sensor, need to take into account the deviation and adjust. Figure 2 retrofit scheme 2 in scheme 1, the length of the processed material is controlled by the position of the photoelectric sensor. Artificial manually set the location of the photoelectric sensor will have certain error, at the same time, if you need to processing length will be trouble if they change frequently. Retrofit scheme 2 cancelled the photoelectric sensor, instead, a wheeled rotary encoder. The wheel rotary encoder pressure over the surface of the plate, when the plank to edge, with rotating wheel rotary encoder, the output pulse signal to the A5 high-speed counter. A5 high-speed counting frequency up to 20 KHZ, can be precisely according to the number of pulses accurately measure the feed length.
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