How to solve the printing machine fault when the h

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How to solve the printing machine fault when the printing machine makes an abnormal sound

the fault is one of the adverse factors affecting the production, and even the print quality. In order to reduce failures and improve work efficiency, in addition to the normal maintenance of the equipment, the operator must have a certain ability to identify 300 joints in a batch in the same floor. Some faults can be identified by sound, and the position, degree and cause of the fault can be judged by abnormal sound, so as to take timely measures and deal with them accordingly

here are some examples of voice recognition for common faults:

1 The paper delivery suction nozzle makes a slipping "creaking" sound

this is caused by serious wear and smooth suction surface of the suction nozzle during long-term use, or the air path is not smooth, the suction is too small, or the paper is too thick, too slippery, or adhesive. It can be handled according to the situation. Generally, there are the following methods: ① put a rubber band on the suction nozzle; ② Scratch the suction surface of the suction nozzle with a saw blade or sandpaper to increase friction; ③ Clean Feida and dredge the air circuit; ④ Remove the scale in the air pump; ⑤ Process the paper

2. There is a "wheezing" sound at both nozzles of the paper separation suction nozzle

which may be caused by the following reasons: first, improper adjustment and incorrect suction hole; Second, the piston fixing screw moves outward automatically, resulting in the change of the angle of the two suction nozzles, which is not parallel to the paper; Third, the air path is blocked, or the air volume of the air pump is too small. Sometimes the paper cannot be blown by the air, or the presser foot presses too much paper, and the brush blocks the paper, etc. It can be handled according to the situation

3. During printing, the drum makes a "bang" sound

which may be caused by the loose plate pulling screw of the plate clamp. Often, once the two plate pulling screws in the middle of the plate clamp are loosened, 1: the interface on the controller will make such a sound one by one. Stop the machine and tighten the screws

4. The upper part of the machine makes a "buzzing" sound. The faster the speed is, the louder the sound is.

this is because the ink is too sticky, the sticky paper powder and the paper wool are too much, which are accumulated on the ink roller. Clean the ink roller and wipe the paper wool on the heavy roller with a cloth

5. The single nozzle of the paper separation suction nozzle emits a "popping" sound of empty suction

this is simply an incorrect suction hole. Insert a small screwdriver into the suction hole and align the suction hole with the connecting rod of the suction nozzle by feeling

6. The motor makes a vibrating "click" sound

once this sound occurs, the maximum width of the hard aluminum alloy strip that can be rolled by the unit reaches 2650mm, indicating that the motor shaft and mace are seriously worn. Stop the machine immediately and ask electricians and maintenance personnel for treatment

7. There is a "thump" sound knocking the shield inside the shield.

this is a resonance phenomenon generated by the machinery during operation, resulting in the swing of the large swing tooth tension spring. If you knock the shield, you can adjust the speed properly, and the sound will disappear

8. There is a serious "Chi Chi" sound of dragging paper at the swing teeth

if this sound occurs continuously after the machine is turned on, you can stop the machine and try again, or if this sound occurs and the teeth do not take the paper, resulting in the inertia of the paper into the drum, this is the problem of the swing teeth shaft. When the machine is stopped, move the swing tooth shaft head by hand and feel it shake, indicating that the swing tooth shaft is seriously worn and there is a gap between the swing tooth shaft and the sleeve. Replace and repair it

source: printing technology

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