Newspaper printing equipment - maintenance (one)
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Maintenance knowledge of printing equipment
In the maintenance and repair of printing equipment, we must adhere to the maintenance-oriented, prevention-oriented thinking, and take effective measures from the organizational form and system to ensure the implementation of this work. The following is an introduction to the maintenance and repair of equipment.
1) Maintenance of printing equipment
Generally can be divided into four categories:
1 routine maintenance, also known as routine maintenance, that is, cleaning, lubricating, fastening loose fasteners, checking the integrity of parts.
2 Level 1 maintenance, regular (such as once a week) equipment inspection: cleaning the dampening system water bucket, water tank, tightening loose parts, machine internal and external cleaning, transmission system, lubrication system, pneumatic system and embossing Part and so on.
3 secondary maintenance, mainly to clean the interior of the equipment (including water glue, ink glue) and lubrication, targeted removal of key parts, adjustment of machinery and equipment (including level, etc.), replacement of wearing parts.
4 Level 3 maintenance, dismantling and adjusting the main part of the equipment, including motor cleaning, inspection technical status, replacement of lubricating oil, etc.; replacement of parts that meet specified wear limits, such as bearing key pins, electrical and pneumatic components Wait.
Pay attention to the following points for air pump and maintenance:
a) Clean the air pump inlet filter weekly? Motor cooling 扉 and air pump pressure regulating valve;
b) refuel the bearings every three months,
c) Perform a major overhaul for each year (or 2,500 hours) to check each major wear piece?
Pay attention to the following points for the maintenance of air compressors:
a) Check the compressor oil level daily, not below the safety mark line position;
b) discharging the condensed water in the gas storage tank daily;
c) clean the air inlet filter core weekly;
d) Check the drive belt tightly every month to clean the motor and heat sink;
e) change the oil every 3 months and thoroughly clean the oil chamber;
f) Check the air pressure drop (leakage) every 1 year. If the pressure drops more than 10%, it is necessary to check and replace the damaged compressor seal in time;
g) Overhaul every two years, and open a comprehensive inspection?
Each printing factory must, based on the actual conditions of the existing equipment, proceed from the actual production, and develop the best maintenance system and maintenance rules that meet the existing equipment and production requirements.
2) Maintenance knowledge of printing equipment
Maintenance of equipment and maintenance of equipment, different contents, different functions, repairs are mainly to find faults, troubleshoot, repair and replace damaged or worn, corroded parts, so that the equipment can operate normally. The repair of the equipment is divided into an electrical part and a mechanical part.
1 electrical part maintenance knowledge
In the daily printing equipment repair work, the electrical part accounts for a large proportion. With the continuous development of printing technology equipment, the degree of automation control is getting higher and higher, and the control system is more complicated. Therefore, electrical maintenance personnel are required to have a high level of technical skills and quality, and understand the computer principle and operation. For the printing and maintenance electrical personnel, pay attention to the following points in the daily maintenance work:
a) Carefully read the electrical schematic diagram and related documents of the equipment, and grasp the electrical principle and control system principle of the equipment from the principle. Find out where the electrical components are located, wiring, routing, numbering, and direction.
b) For the failure of the machine equipment, carefully analyze the part where the fault may occur, and find the components and circuits that may cause the fault according to the electrical schematic diagram, wiring diagram, etc., for diagnosis, and eliminate them one by one.
c) In electrical repair, first check the power supply voltage, whether the current is normal, whether the air pump pressure reaches the standard, whether the lubrication system oil pressure reaches the standard, etc., if necessary, the load can be disengaged, which is helpful to judge whether it is caused by mechanical overload. Electrical fault or protection.
d) The web offset printing machine adopts PC to carry out automatic control, which brings many conveniences for troubleshooting electrical faults. Generally, there are LEDs in the control cabinet for fault indication, and the faulty parts can be found according to the prompts. In the device, you can first find the prompt on the console display, or use the laptop to talk to the industrial computer in the control cabinet, find the faulty system, and then eliminate them one by one.
e) Commonly encountered electrical faults can be summarized as: fuse damage, contactor, relay contact damage, loose wiring, poor contact, button, limit switch failure, a position control switch in the safety protection system is not reset, In the tension control system, the photodetection part of the paper break system is faulty, and the solenoid valve is leaking and damaged.
f) The motor is the source of power in the printing equipment. The following is a brief introduction to the common faults of the DC motor and the AC motor.
Common faults in DC electric operation have both mechanical and electrical aspects. The mechanical failure mainly manifests as bearing heat, motor vibration, armature and stator core collision and abnormal noise. Generally, it is caused by the rotation of the armature. During the inspection, the armature is manually rotated to observe whether the armature is in contact with the stator, and whether the vibration is caused by the motor itself or due to the malfunction of the transmission device. The motor is less likely to vibrate due to its poor dynamic balance. It is often the case that the concentricity of the transmission is not good and causes vibration. This phenomenon may cause damage to the motor bearing and even cause deformation of the armature output shaft.
The most common electrical fault of DC motor is the spark between the brush and the commutator. During normal operation, the spark between the brush and the commutator is light blue, weak and fine, and the contact surface of the brush is smooth and bright. A reddish brown oxide film is formed on the surface of the commutator. When the motor is not operating normally, the spark size and color will change. When the fault is slight, the spark will appear yellowish red, brighter, and the surface of the commutator will be black and burnt. If the spark is serious, it will spray a lot of red and green Mars, and it will be mixed with flash fire. It will also be accompanied by a squeaking sound. If it is not stopped for inspection in time, the commutator and brush and brush holder will burn out soon. When the brush position deviates from the geometric center line, serious sparks may occur when the armature winding is open or short-circuited inside. In addition, the brush brand, performance does not match, the brush pressure is too large, too small, the brush is not well polished, the contact area is too small, etc., will cause failure.
The mechanical failure of an AC three-phase asynchronous motor is basically the same as that of a DC motor. Here is a brief introduction to the common electrical faults. One is the single-phase running fault, that is, one phase winding of the three-phase winding of the motor is disconnected. At this time, the motor torque is significantly reduced, the speed is slow, the sound is abnormal, and the motor takes a little longer. Burnt out due to severe heat; Second, the motor is extremely hot, and even smells of paste. This kind of fault may be caused by the load being too heavy, or the power supply voltage is too low or too high.