Fault maintenance of linear filling machine

Fault maintenance of linear filling machine: 1 PLC fault: PLC fault mainly includes output point relay contact adhesion If the motor is controlled at this point, the fault phenomenon is that after the signal starts the motor, the motor runs, but after the stop signal is sent, the motor does not stop running When the PLC is powered off, the motor stops running If this point controls the solenoid The fault phenomenon is that the solenoid valve coil is continuously energized and the cylinder is not reset If an external force strikes PLC to separate the adhesion points, it can help to judge the fault There are two ways to repair the PLC output point fault One is to modify the program with the programmer, change the damaged output point to the standby output point, and adjust the line at the same time If 1004 points of the control solenoid valve are damaged, change to 1105 points as the standby point Use the programmer to find 1004 related statements Keep (014) 01004 is keep (014) 01105 The 1002 point of the control motor is damaged, it is changed to the standby point 1106, and the 1002 point related statement out 01002 is changed to out 01106, and the line can be adjusted at the same time If there is no programmer, the second troublesome one can be used Dismantle the PLC, dismantle the PLC and replace the output relay of the standby point to the damaged output point Then install according to the original wire number 2 Proximity switch failure: there are five proximity switches in the packaging machine of the filling machine Three for knife protection and two for controlling the upper and lower film release motors One of them is used to control the knife protection, and occasionally one or two times of misoperation It will interrupt the normal operation process, and because the number of failures is small and the time is short, it will bring some difficulties to the analysis and removal of failures The typical performance of the fault is that occasionally the melting knife drops but does not reach the position and raises automatically The reason for the failure is that the fusing knife is falling No packages were encountered When the proximity switch loses signal, the knife will automatically return upward just like the knife guard board contacts the package In order to improve its reliability, a switch of the same type can be installed in parallel with the proximity switch of the rising position of the melting knife 3 Magnetic switch failure: the magnetic switch is used to detect the position of the cylinder and control the stroke of the cylinder The actions of four cylinders, stacking, pushing, pressing and fusing knife, are related to each other The magnetic switch is used to detect and control their positions The main fault is that the subsequent cylinder does not act, because the cylinder speed is fast, so the magnetic switch can not detect the signal If the speed of the pushing cylinder is too fast, the pressing cylinder and the fusing knife cylinder will not act after the pushing cylinder is reset The fault maintenance method can adjust the throttle valve on the cylinder and its two position five way solenoid valve, reduce the flow of compressed air and reduce the operation speed of the cylinder until the magnetic switch can detect the signal 4 Solenoid valve fault: the main fault of the solenoid valve is that the cylinder does not act or reset, because the cylinder solenoid valve cannot change direction or blow by If the solenoid valve blow by, the air pressure of the machine can not reach the working pressure and the knife beam cannot rise in place due to the connection of the air inlet and outlet channels The knife beam protection proximity switch does not work, the preconditions for the operation of the whole machine are not established, and the machine cannot operate, which is easily confused with the electrical fault There is a sound of gas leakage in solenoid valve blowby Listen to the sound source carefully and search for the leakage point by hand Generally, it is easy to find out the solenoid valve of blowby The maintenance method is to clean the solenoid valve and replace the damaged sealing ring If it is impossible to repair, replace the solenoid valve