Maintenance of the circuit for offset press machine maintenance
6.7 Maintenance of the circuit
Circuit maintenance is also an important part of printer maintenance. The following should analyze the things to pay attention to through the drive chain diagram of the circuit:
Detection element-control element-drive circuit-actuator
The detection element is used to detect the working state of the printing press. For example, the eye position switch is used to detect the position that a part should reach. The eye position switch must be in a normal state, otherwise it may cause a serious accident. If the eye switch that raises the paper stack fails, the paper stack may damage the top of the feeder, as does the limit switch in the delivery section. Every time you start the machine, you should pay attention to these problems and eliminate these hidden dangers. The detection device also includes a safety switch, a shut-off switch, and a dangerous position protection switch. These switches directly show the current state of the printing press: whether it can run or not. The false signals of these switches may cause serious consequences, so the working status of these components should also be regularly checked, and it should be particularly noted that these switches cannot be easily removed. The detection element also includes some operating state detection switches, such as the pre-regulator electric eye detection and the reed switch detection. Misdiagnosis or abnormal operation of these switches may make the printing machine unable to enter the normal operation state. The control element is used to control the drive circuit, but its signal comes from the detection element, the signal received by the control circuit must be normal, otherwise it may cause malfunction or damage the circuit, so the anti-interference requirement of the control circuit Very strict, it is best to add a noise filter to some sensitive components, or shield them with special materials.
The drive circuit is generally a high-power component, and its heat generation is large, so the heat dissipation of such components is an important content of maintenance. If the fan of the motor is stopped, it is very dangerous. Covering the motor from paper or other objects will also cause damage to the motor.
The actuator is a mechanical circuit, such as the rotor of the motor. If the mechanical circuit is not smooth, the driving energy of the circuit cannot be converted into work, but only into heat, which causes the temperature to rise sharply, causing component damage. Therefore, it is necessary to ensure the smooth flow of the mechanical four-way.
The circuit wiring must be carefully considered: first, to prevent it from colliding with mechanical parts, causing short circuits or open circuits, so it should be fixed. Second, the wire should be well protected to prevent the rubber on its surface from aging, such as the use of snake skin tube. In addition, try to avoid lubricating oil dripping onto the wires. In addition to this, care should be taken to avoid breaking the line interface due to vibration.
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