Analysis of the phenomenon of filling and plugging machine, which occurs after * times and is always filled by a group of four (or five) heads at the same time, must have received a second filling start signal. From the display screen, there is a "running" display. Because the equipment does not detect the start signal during the filling process, it indicates that another start signal was received at the end of the filling process. Since it does not occur every time, it indicates that it is an interference signal. Why does it not appear during the steady period and has a higher probability of appearing during slow filling? Through on-site observation, it was found that the time for the start signal light on the PLC to light up decreases with the increase of filling speed, and becomes longer as the filling speed slows down. The closer or later the end time of the start signal is to the filling time, the more likely it is for secondary filling to occur. That is to say, during the disappearance of the start signal on our control board, it is easily affected by interference signals, causing secondary triggering. Conclusion: Long start signal and interference signal can easily cause repeated filling phenomenon.

Solution: Due to the high pulse frequency of the interference signal, anti-interference measures can be added to the startup line, but it is impossible to predict and determine the interference signal. Extending the time at the end of each filling before conducting the next test can avoid the unstable period at the end of the previous start signal, but it may bring drawbacks that cannot be achieved for rapid filling. The PLC sends a short start signal (such as 20ms), so that regardless of the filling process, the start signal will always enter a stable period after completion, making the control circuit less susceptible to interference signals. This is the fundamental solution.

The filling and capping machine's fiber optic detection for bottle entry is not sensitive, and there are a few missed signals that cause the peristaltic pump to not fill. Solution: Adjust the detection fiber or replace it with a new fiber. The filling setting parameters were not set properly, which exceeded the normal working range and caused the peristaltic pump to malfunction. Solution: Set the filling parameters as required. The silicone tube is leaking, the peristaltic pump is working, and the medication has not been delivered. Solution: Check the leaking part of the pipeline and replace it with a new silicone tube. There is a problem with the electrical control program, which sometimes leads to not filling. Solution: Modify the electrical control program. Poor sealing of suction port, poor sealing of discharge port, aging and poor sealing of silicone tube, incorrect installation matching number, and thin wall of silicone tube. method

Check if the silicone tube gasket and silicone tube at the suction end are sealed properly, and check if the silicone tube gasket and silicone tube at the discharge end are sealed properly. Replace the silicone tube with a new one and reinstall it according to the factory matching number.