With a strong interest in new printing equipment and new technologies, some time ago, the author visited several newly established printing companies in Zhengzhou. I was deeply impressed by the color offset press, Heidelberg PM74 type four-open four-color offset printing machine, Japan Sakura Corporation 0L466 type four-open four-color offset printing machine, etc. Compared with the past, these new imported equipment have made great progress in printing speed, equipment performance and automation level. At the same time, how to properly maintain and maintain these devices has become a primary issue. During the interview, the author has encountered many accidents caused by improper operation, such as the surface of the cylinder of the offset press being rolled, the suction roller shaft of the paper receiving part being bent, and even an accident that threatens personal safety. Here, the author combines several years of practical operation and management experience, and summarizes some knowledge about the maintenance and maintenance of the new four-color offset printing machine for everyone to exchange.

1. Maintenance and maintenance of paper feeding device

The air pump of the high-speed multi-color offset press paper conveying device must use graphite pumps, not lubricated air pumps, because once the lubricating oil flows into the rotary air valve of the paper feeder through the air pump and combines with the paper powder in the paper, it is very easy The spool and sleeve of the rotary air valve are killed, resulting in a serious accident.

The rotary air valve should be cleaned once a month. When cleaning, use gasoline or alcohol instead of kerosene or engine oil to prevent the rotary air valve from seizing up. There is no need to add oil or butter after cleaning, because the graphite powder in the graphite pump has already played a lubricating role.

The feeder separation cam and paper feed cam should be lubricated with appropriate amount of butter every week, but remember not to overdose, otherwise it will cause the movement of the paper separation nozzle or paper feed nozzle to be out of order, affecting the quality of the product. The movement of the feeder feed nozzle is controlled not only by the cam, but also by the guide groove. In order to ensure the stability of its movement, when maintaining the feeder, the guide groove should also be properly filled with butter to reduce mechanical friction.

The swing paper stopper at the front of the paper feed must be refilled with machine oil once a week, because the paper powder and paper wool are very easy to cause the swing paper stopper to dry friction due to lack of oil. Note that the amount of oil should be appropriate when refueling, so as not to touch the paper on the paper and affect the quality of the product, causing the product to be scrapped.

A conveyor belt is generally provided on the paper conveying table, and the thread belt is tightened to play the role of conveying paper. Since there is no lubricating hole in the thread belt shaft seat, the thread belt shaft bearing must be lubricated every week.

When the equipment is maintained every week, the swing and rotation of the mechanical double-sheet controller must also be confirmed to avoid the occurrence of vehicle jams.

2. Maintenance and repair of positioning device

The positioning device is one of the important components of the multi-color offset printing machine. The accuracy of product overprinting is mainly guaranteed by the positioning device, so the maintenance and care of the positioning device is insignificant. 'Maintenance and maintenance of the positioning device mainly includes the corresponding lubrication and cleaning of the front and side regulations.

3. Maintenance and maintenance of ink delivery and water delivery devices

(1) Maintenance and maintenance of the inking device

The maintenance and maintenance of the inking device is different for different models, and it is necessary to add butter regularly according to the requirements of the operation manual. It is recommended to dismantle the ink roller of one of the units every week and clean and maintain it. The aging or orange peel ink roller should be replaced in time, and the bearings on both sides should be inspected when the ink roller is disassembled. If loose or worn. It should be replaced in time to avoid excessive wear or shedding of the shaft seat or sleeve. When disassembling the ink roller, pay attention to the cleaning of the hard ink roller, because the hard ink roller plays the role of ink leveling and absorbs the ink skin and paper wool. When cleaning, do not use a blade or sharp tool to avoid damage to the hard ink The surface of the roller. Remove and wash a group of ink rollers every week, and confirm the indentation of the ink rollers. For four-color machines. Complete the cleaning of the inking system once a month, so as to ensure the normal operation of the inking system

(2) Maintenance and maintenance of water delivery device

All water rollers (such as water bucket roller, metering roller, water roller, etc.) of the alcohol wetting system are removable. In order to facilitate disassembly, the general transmission gear is on the outside of the wall plate and exposed. When cleaning the ink roller. It is easy to cause ink to splash into the transmission gear, so pay attention to the cleaning of the transmission gear during the cleaning and maintenance process, and pay attention to the transmission gear when installing the water roller.

After using the water roller for a certain period of time. Both the water bucket roller and the water receiving roller are reduced in diameter due to pressure. When the water roller is adjusted to a slight vibration of the transmission gear, the water roller should be replaced to avoid causing white stripes on the transmission gear due to abnormal wear

4. Maintenance and maintenance of paper conveying device

The stability of the paper transfer device is related to the accuracy of product overprinting. The paper transfer device generally adjusts the height of the dental pad to the printing thickness according to the paper thickness. For papers between 3mm and 3mm, it is not necessary to adjust the device: when printing papers with a thickness of 3mm or more. The height of the tooth pad on the paper transfer device must be adjusted, otherwise it will cause inaccurate overprinting and abnormal wear of the paper transfer mechanism. For example, there are multiple grease nipples on the gripper shaft of the paper transfer mechanism of Komori S40, Sakurai 0L466 During the monthly maintenance and maintenance of the equipment, an appropriate amount of butter should be added to ensure the stability of the paper transfer device.

The opening and closing tooth roller of the transfer roller is the key to accurate overprinting. It is recommended to add high temperature butter to the opening and closing tooth roller of the transfer roller every week. At the same time, add appropriate amount of butter on the open tooth cam. To reduce wear. Because once the cam is worn, it will affect the accuracy of the overprint, and replacing the cam is quite troublesome.

5. Imprinting device maintenance and repair

Correct maintenance and maintenance play an important role in prolonging the service life of the impression cylinder. The following are some common practices.

In order to avoid damage to the surface of the impression cylinder. All kinds of substances that may cause mechanical damage (such as engraved needles, sand skin, cleaning fluid containing polishing agent, ink shovel, etc.) can not act on the surface of the roller. Regardless of whether the printing machine has an automatic cleaning device, the surface of the impression cylinder must be cleaned manually at least once a day, and strong acids (such as plate cleaners), ink cleaners, chlorine-containing cleaners, and strong acid solutions must not be used for cleaning. In addition, the rollers of the three cylinders (plate cylinder, rubber cylinder, impression cylinder) must be cleaned once a day.

Impression cylinder maintenance includes. The gripper shaft is filled with butter once a month, the opening and closing tooth roller is filled with butter once a week, and the opening and closing tooth cam is filled with butter once a week. Clean dental tablets and dental pads annually or in due course. Please follow the operating instructions for specific cleaning methods.

6. Maintenance and maintenance of the delivery device

People often pay less attention to the maintenance and maintenance of the paper collection device than to the host. In fact, the maintenance and maintenance of the paper collection device also affects the quality of the product and the service life of the machine.

(1) Maintenance of paper delivery device

Use a steel plate brush to wipe off the oil dirt adsorbed on the delivery chain every quarter. Otherwise, whether it is manual refueling or automatic refueling, the oil can only be added to the grease on the chain. However, the chain itself is not lubricated by engine oil. For a long time, it will inevitably cause equipment accidents such as chain shortage and wear, chain breakage, and even personal injury accidents. So every quarter must insist on doing a good job of cleaning the paper collection chain. And add lubricating oil manually to ensure that the delivery chain is always in a lubricated state.

(2) Cleaning of the delivery device

It is also important to remove dust from the entire paper collection device. Multi-color offset presses are equipped with powder spraying devices. A large amount of powder spray will accumulate on the paper collection air pressure device or support rod. When the dusting builds up to a certain degree, an "avalanche" phenomenon will occur, such as "avalanche" falling on a large area on the ground, which will cause the product to be scrapped. So when printing large-area field products. First of all, the entire paper collection device should be dedusted. Otherwise it will cause undesirable quality problems or cause unnecessary economic losses. The work of adding butter to the collection line should not be missed. Must insist once a month. Although the opening and closing range of the paper-collecting tooth row is not large, it needs to be opened and closed tens of thousands of times a day. Ignored the premature maintenance of the dental row. Excessive wear and tear will cause insufficient gripping force of the tooth row, failure to put paper in the row and failure of peeling paper.

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