PLC stacker crane in the high time measurement, the application of closed

Before 1 word stacker crane is one of the important equipment, packaging and palletizing line it to speed up the processing of the whole line play a key role. As enterprise collectivization, the production scale, palletizing machine has high processing speed, 1000 bags/h of the stacker crane can no longer meet the needs of production, in this case, on the one hand, need to develop new type of high speed stacker crane, on the other hand high need for traditional stacking machine. In the process of the transformation of traditional stacker crane, need in the case of no package, the process parameters to measure time, so that the original stacker crane have a correct understanding of these parameters. For program protection reasons, often are not allowed to change the original program, in this case, the only other USES a programmable controller, through collecting the information of the original process signal measured in process of time. However, in the case of no package, doors are measured with this method of measuring time but can not get the correct results, the reason is that in the case of package and in the process of running without the package is different, this article will analysis the two processes of different reasons, and puts forward a new method of measuring the analog input signal measurement. 2 high stacker crane open closed time refers to the physical significance of the so-called open closed time skateboard from open to close door is of time, this parameter is calculated in crib for a very important parameter of the time. Figure 1 shows the open close time and measurement of the mechanical structure of the diagram. In a package under the condition of operation, when to open a door open, platen press package tray and continue to fall, according to the lifting platform layer down the moment when the signal light, lifting platform stopped falling and cylinder return, when the upper signal light, the door shut is a, closed and open time includes four parts: open time, layer down time, process time and closing time. Measurement is, however, in the case of no package, in this case, when the door open to open cylinder drops rapidly, in a very short period of time under the light signal and return, which requires a hydraulic lift platform layer down the startup time, can't be in this is done in a very short time to start the movement, cannot cause layer process, and then open closed time only includes three parts: open time, return time and close time, without this part layer down time, unable to reproduce the measured open close time of the real operation process, we try to measure experiment open closed time limited to empty bags. 3 open close time of the analog input by a on the measuring principle, open close time measuring empty bags under the difficulty is rooted in the cylinder of a premature signal light, the lifting platform could layer down cylinder return. In this case, have to cancel the obstacles to represent the real operation process of the input signal, and then to simulate such a signal instead, there is a question how a simulation. In a package under the condition of operation, cylinder is in the lifting platform layer under a certain distance to ignite a signal before I return. If we can be obtained in the case of a package of lifting platform layer fall time t, then run without package and cancelled under the condition of lower signal, when to open a door open, pressure plate pressure on the tray and with the lifting table decline, at the same time start the timer, when the timer timing time is t, to measure the PLC controller signal an output drive an intermediate relay, by making the intermediate relay contact signals under a simulated cylinder method, makes the cylinder in the lifting platform layer after reducing the required distance to return. Like this, under the condition of the empty package operation, overcome the limitation of the hydraulic startup lag, has realized the real operation process, the need to open close time, concrete realization circuit, as shown in figure 2. As can be seen from the figure 2, in order to measure open shut down time, by enabling signal of Q6. 1 drive intermediate relay KA50, S7-214 PLC controller collection KA50 contact signals as the starting point of the measurement, collection high stacker PLC has D11 input module 10 skateboard off a signal. 3 as the end of the timing signal, thus measured open close time. Under the condition of the empty package operation, when the hydraulic lifting platform layer down, Q6. Output of 1, 2 intermediate relay KA52 electricity, at this point, the measurement of S7-214 PLC input signal is 10. Effective 1 in 10. 1 after the time required to effectively, to measure the output of the PLC Q 0. 1 to output signal, thus drives the intermediate relay KA51, KA51 contact signals are collected into high stacker PLC D12 input module 11. 3 ports. In the attachment, the stacker PLC input module must dismantle the high D12 on the lower line 11. 3, in this way, then use analog input signal instead of the actual input signal. When 11. 3 is valid, in the original program, under the control of pressure cylinder picks up, back in place after the slide door closed,, da guan S7 - The input port 10, 214. 3, effective from 10. 2 to 10 effectively. Three experienced time effectively, is measured by the closing time, specific measurement procedures, as shown in figure 3 below. 4 knot theory introduces a time parameter measurement method of analog input method of measurement, the measuring method is in high speed high stacking machine, put forward by the reform on the basis of the practice of measurement in operation under the condition of empty bags, due to the hysteresis hydraulic startup, leading to lower signal become an obstacle to the reappearance of package operation, in this case, cancel the input signal, with analog signals and of generation, to measure the real time parameters.
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