Common fault analysis and elimination of Heidelberg offset press (on)
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Fault 1: The paper arrives at the front gauge and the entire machine is shut down.
Analysis: This fault is mainly caused by the paper not getting good and the light hole not being adjusted.
Cause of failure 1: The paper is too early or too late.
Remedy: Jog the machine to move the paper to the front gauge. When viewing the front gauge return position and dropping to the lowest point, the distance between the paper and the front gauge is 4~5mm. If it is less than 5mm, the paper is too slow; otherwise, the paper is too fast. The two ¢13mm nuts on the operating surface can be loosened and adjusted to the standard position by means of the flange.
Cause 2: If the paper is not in place, it may be that the light control head of the front gauge is malfunctioning.
Remedy: After jogging the machine to the front gauge to the positioning position, put a square paper on the front gauge and gently push it to the front gauge. At this time, the two gauges of the light control head are placed at the front gauge. The photoelectric display light should be on. If one does not light, it means that one side is ahead of time, causing the illusion that it has not arrived. Turn the adjusting screw clockwise until the indicator light is on, then turn it into 1~2 turns.
Cause 3: If the two photoelectric display lights are not bright or dark when they are lit, there may be impurities such as paper hair on the light eye, which may cause photoelectric detection errors.
Remedy: Wipe clean with a soft cloth dipped in alcohol.
Cause 4: The swinging teeth are too small. You can click the machine to view it. When you find that the paper is bounced back when you swing the hem to the quick crepe paper, it is judged to be caused by the swinging teeth.
Remedy: Jog the machine to the position of the paper feeding paper to the paper feeding table. At this time, the 90° right angle gauge can be used to measure the position of the dental pad and the paperboard at 90°, and the shank with a mm13mm socket wrench Tooth nut (operating surface), use a 1mm screw to insert into the teeth, and then use a 3mm hex wrench to adjust the adjusting nut, the handle is slightly resisted when pulled out.
Cause 5: The paper is skewed or the paper is burred, causing downtime.
Remedy: At this time, the Feida and the paper feed lever can be adjusted to make the two sides fast and slow.
Fault 2: The paper side gauge is not in place
The cause of the failure 1: Because the second mobile phone is used for a long time, especially the wear of the pull bar is serious, causing the pull plate to withstand the lower plate and the pull ball can not touch the pull bar.
Remedy: At this time, loosen the two ¢5mm fastening nuts on the puller strip, remove the puller strip, and use 0.1mm steel sheet (depending on the degree of wear) to make the shape of the pull tab And fasten it under the original brace, add the right amount of oil to tighten, and the effect is good.
The cause of the failure 2: The traction plate is up and down on the mountain and is seriously worn, causing the paper to rise and fall not to be crisp, and it is easy to cause the paper to be out of place.
Remedy: The pull-down gauge plate can be removed, and the thickness of the original wear is 1mm, and it can be installed in the original position.
Cause 3: The side gauge tension spring pressure is too small.
Remedy: Tighten clockwise.
Cause 4: The eccentricity of the pull gauge ball is too high.
Remedy: Turn to adjust to fit.
Cause 5: When printing whiteboard paper, the pressure of 4 brush wheels is too heavy.
Remedy: Adjust the light or move it back to the appropriate position.
Fault 3: CPC shows a large amount of ink, but the actual amount of ink is relatively small.
Cause of failure 1: The ink fountain film is used for a long time, and the leaked ink is agglomerated under the ink fountain sheet, causing the ink discharge amount to decrease.
Remedy: Clean the ink on the cylinder eccentric (32 total), and replace the dirty sponge strip with a new ink fountain (the ink fountain has a service life of 36 hours).
Cause 2: The motor screw that controls the amount of ink is accumulated on the screw, which makes the screw rotation inflexible or even stuck, resulting in no ink or uneven ink output.
Remedy: Disassemble the 32 blocks under the ink fountain (note: do not lose the hollow sleeve on the fastening screw), use the needle to remove the ink on the screw, and remove all the accumulated ink, and move the CPC to make each motor The flexibility can be achieved from the minimum amount of ink to the highest amount of ink, and the tank is filled with butter, which can maintain good ink discharge for a long time, and the effect is very good.
Fault 4: The ink transfer roller is not good.
Cause of failure 1: Due to long-term use of the transfer roller, the surface is aged, the ink transfer performance is degraded, and the rubber on the surface of the ink roller is cracked or crystallized.
Remedy: If surface crystallization occurs, it can be repeatedly wiped with gasoline pumice powder to improve surface adsorption performance. The surface aging caused by cracks can only be replaced by the same size ink roller.
Cause 2: When replacing the transfer roller, the size of the machine is not enough, which may cause the size of the replaced ink roller to be too large or too small. If the ink fountain roller is continuously slipped during the adjustment, the corner angle is sharply increased, which is caused by the large size of the ink roller, and the ink transfer roller does not disengage from the ink fountain roller when the ink is transferred to the ink roller.
Remedy: If this situation is found, it should be stopped decisively and replaced with the standard size ink roller. Generally, the diameter error of the ink roller should be controlled within ±0.5mm.
Cause 3: Due to long-term use, the ink of the ink fountain roller is greatly vibrated when the ink is transferred. In addition, improper adjustment of the ink transfer roller causes the hollow pins at both ends of the ink transfer roller to bend, causing the ends of the ink roller to be different. Generally, when the transfer roller is in operation, one end is in good contact with the ink fountain roller, and the other end is not in contact with or in contact with the transfer roller. If the pressure of the end and the ink fountain roller is increased, the phenomenon of "slipping" of the entire transfer roller will occur, causing the vibration of the machine to be increased and the ink to be darker and the printing cannot be performed at all.
Remedy: The shells on both sides can be removed, the back of the two ends of the ink fountain can be removed, and the hollow pins at both ends of the transfer roller (¢ 8 mm) can be taken out and replaced with new ones.
Note: A hollow pin with a diameter of 6mm should be inserted into the new ¢8mm hollow pin to ensure that it does not deform for a long time.
Fault reason 4: The transfer roller controls the gas valve fixing screw to break, resulting in no ink transfer or more wear on the back of the transfer roller, so that the transfer roller will also hit the ink fountain roller when the ink stops.
Remedy: Open the cover on the side of the machine operating surface and check whether the valve fixing screw is intact. If it breaks or falls off, reinstall it. After installation, press the transfer roller switch to check whether the valve is working properly. If it is not normal, it should be removed and repaired. If the backing is more serious, loosen the 3mm head screw on the back of the mountain, adjust it to the proper position, and then lock the head screw.