The square wave program is programmed to write a square wave program using two delay-on timers T98 and T99. The realization process is as follows: the T99's normally open contact is used to control the operation of T98, and the T98's normally closed contact is used to control the operation of T99. The set timing of T98 is 1.5s, and the set timing of T99 is 15 seconds. After the program is input into the PLC, it runs according to the following sequence: in the first scan cycle, the normally open contact of T99 is not turned on, the timer T98 is not started, the normally closed contact of T98 is in the ON state, and the timer T99 is started. At the beginning of the timing, the program is also constantly performing periodic scans. When the T99 timer is set to 15 seconds, its output coil is turned on. In the next scan cycle, T98 is activated because the normally open contact of T99 is closed, and the normally closed contact of T98 is disconnected after 1.5s. Among them, the pulse peak period output by T99 is the starting operation period of the fan motor, and the valley period of the pulse is the stopping time period of the fan motor.
The square wave program is connected to the operation program of the exhausting air fan: the T99 timer is used to realize the intermittent start and stop function of the moisture-discharging fan during the cleaning time period; the reverse operation of Q11.6 realizes short-circuiting the T99 after the cleaning process is completed, so that the row is exhausted. The tidal fan can run continuously. Optimize the fan operation program to add the time-delay disconnect timer T75 to the fan cleaning program. The procedure is shown in Figure 7: The T75 timer is used to achieve the operation of the exhaust fan after the cleaning water stops. When the fan cleaning process is completed, the fan can be continuously operated for a few minutes (time is obtained by experiment) to blow dry the moisture inside the fan, so that the fan will not be formed quickly due to the mixing of internal residual washing water and soot. The discharged sticky dirt contaminates the cut tobacco to avoid quality accidents.
Through the design and transformation, the automatic cleaning device of the stalk and scented drum exhausting fan achieved the expected goal, achieved the intended purpose, reduced the workload of manual periodic disassembly and cleaning, and proved that the effect was good and the equipment was greatly improved. Effective operating rate. The exhausting fan with cleaning function is also applied in other process sections of the workshop. We can apply the above solutions to other equipment in the workshop.
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