Maintenance and maintenance of the new four-color offset press
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When encountering an accident caused by improper operation, such as the surface of the offset roller of the offset printing machine, the suction roller shaft of the delivery section is bent, and even an accident that endangers personal safety occurs. In this author, combined with years of practical operation and management experience, I gathered a few points about the maintenance and maintenance of the new four-color offset press for everyone to communicate.
1. Maintenance and maintenance of the paper feeding device
The air pump of the high-speed multi-color offset printing machine must use the graphite pump instead of the lubricating oil pump, because once the lubricating oil flows into the rotary valve of the paper feeder through the air pump, it is easy to combine with the paper powder in the paper. The rotary valve spool and the valve sleeve are killed, causing serious accidents.
The rotary air valve should be cleaned once a month. Use gasoline or alcohol when cleaning, not kerosene or oil to prevent the rotary valve from seizing. It is not necessary to add oil or butter after cleaning, because the graphite powder in the graphite pump has already been lubricated.
The paper separator cam and the paper feed cam should be lubricated with a proper amount of butter every week, but it should be remembered that it should not be excessive. Otherwise, the movement of the paper separation nozzle or the paper feed nozzle will be unbalanced, which will affect the product quality. The action of the Feida paper feed nozzle is not only controlled by the cam, but also controlled by the guide groove. In order to ensure the stability of the operation, the grease should be properly added to the guide groove during maintenance maintenance to reduce mechanical friction.
The oscillating paper teeth at the front end of the paper feeding must be filled with oil every week, because paper powder and paper wool are very likely to cause dry friction of the oscillating paper teeth due to lack of oil. Note that the amount of oil should be appropriate when refueling, so as to prevent the oil from hitting the paper and affecting the quality of the product, resulting in the product being scrapped.
The conveyor plate is generally provided with a conveyor belt. The belt is stretched on the belt to transport the paper. Since there is no oil hole on the shaft seat, the shaft bearing must be refueled every week.
When performing equipment maintenance every week, the swing and rotation of the mechanical double-plate controller should also be confirmed to avoid a car accident.
2. Maintenance and maintenance of positioning device
The positioning device is one of the important components of the multi-color offset printing machine. The accuracy of the product overprinting is mainly guaranteed by the positioning device, so the maintenance and maintenance of the positioning device is sloppy. The maintenance and maintenance of the positioning device mainly includes the corresponding lubrication and cleaning of the front and side gauges.
3. Maintenance and maintenance of inking and water delivery devices
(1) Maintenance and maintenance of the inking unit
The maintenance and maintenance of the inking unit varies from model to model, and the grease should be added regularly according to the requirements of the operating instructions. It is recommended to remove the ink roller of one of the units every week and clean it. For the aging or orange peel ink roller, it should be replaced in time, and the bearings on both sides should be inspected when the ink roller is removed. If it is loose or worn. It should be replaced in time to avoid excessive wear or shedding of the shaft seat or bushing. Pay attention to the cleaning of the hard ink roller when disassembling the ink roller, because the hard ink roller plays the role of absorbing ink and absorbing ink and paper hair. When cleaning, it is not possible to use a blade or a sharp tool to avoid damage to the hard ink. The surface of the roller. A set of ink rollers are removed and washed weekly, and the indentation of the ink roller is confirmed. For the four-color machine. Complete the cleaning of the inking system once a month to ensure that the inking system works properly.
(2) Maintenance and maintenance of water delivery devices
Water rollers (such as water bucket rollers, metering rollers, water rollers, etc.) of the alcohol wetting system are removable. In order to facilitate the disassembly, the general transmission gears are on the outside of the wall panel and exposed. When cleaning the ink roller. It is easy to cause ink to splash into the transmission gear. Therefore, during the cleaning and maintenance process, pay attention to the cleaning of the transmission gear. When installing the water roller, pay attention to the grease of the transmission gear.
After the water roller is used for a certain period of time. Both the bucket roller and the water roller are reduced in diameter due to pressure. When the water roller is adjusted to slightly shock the transmission gear, the water roller should be replaced to avoid white streaks caused by abnormal wear of the transmission gear.
4. Maintenance and maintenance of the paper conveying device
The stability of the paper conveying device is related to the accuracy of product overprinting. The paper conveying device generally adjusts the height of the dental pad at the printing thickness as the thickness of the paper changes. When the paper is between 3mm, it is not necessary to adjust the device: when printing paper with a thickness of o 3mm or more. The height of the dental pad on the paper conveying device must be adjusted. Otherwise, the overprinting may be inaccurate and the paper-feeding mechanism may be abnormally worn. For example, the paper-feeding mechanism of the offset printing machine such as Komori S40 and Sakurai 0L466 has a plurality of grease nozzles. When maintaining and maintaining the equipment on a monthly basis, add a proper amount of butter to ensure the stability of the paper machine.
Paper roller roller opening and closing tooth roller is the key to accurate overprinting. It is recommended to add high temperature resistant butter to the opening and closing roller of the paper roller every week. At the same time, add a proper amount of butter to the open cam. To reduce wear and tear. Because once the cam wears, it will affect the accuracy of the overprint, and it is quite troublesome to replace the cam.
5. Maintenance and maintenance of the imprinting device
Proper maintenance and care play an important role in extending the life of the impression cylinder. Here are some general practices.
In order to avoid damage to the surface of the impression cylinder. All kinds of substances that may cause mechanical damage (such as styling, sand, polishing liquid, inkjet, etc.) can not act on the surface of the drum. Regardless of whether the printing machine has an automatic cleaning device, the surface of the impression cylinder should be cleaned at least once a day, and no strong acid (such as cleaning agent) and ink cleaning agent, chlorine-containing detergent and strong acid solution should be used during cleaning. In addition, the three rollers (plate cylinder, blanket cylinder, impression cylinder) roller must be cleaned once a day.
The maintenance of the impression cylinder includes. The fang shaft is filled with butter once a month. The opening and closing of the tooth roller is filled with butter once a week, and the opening and closing tooth cam is added with butter once a week. Clean the teeth and pads every year or at the right time. Please follow the operating instructions for the specific cleaning method.
6. Maintenance and maintenance of the delivery device
People pay more attention to the maintenance and maintenance of the delivery device than to the mainframe. In fact, the maintenance and maintenance of the delivery device also affects the product quality and the service life of the machine.
(1) Maintenance of the delivery device
Every quarter, use a wire brush to wipe off the grease stained on the delivery chain. Otherwise, whether it is manual refueling or automatic refueling, the oil can only be added to the grease on the chain. The chain itself is not lubricated by the oil. Over time, it will inevitably lead to equipment shortages such as lack of oil and wear, chain breakage, and even personal injury. Therefore, every quarter must adhere to the cleaning of the delivery chain. And manually fill the lubricant to ensure that the delivery chain is always in a lubrication state.
(2) Cleaning of the delivery device
It is also important to remove the dust from the entire delivery device. The multi-color offset press is equipped with a dusting device, and a large amount of dust is deposited on the delivery wind pressure device or the support rod. When the dust is accumulated to a certain extent, an "avalanche" phenomenon occurs. If the avalanche falls on a large area, the product will be scrapped. So when printing large areas of field products. First, the entire delivery device should be dusted. Otherwise it will cause quality problems that may not be caused or cause unnecessary economic losses. The work of adding butter to the receiving teeth is not to be missed. Must insist on once a month. Although the opening and closing of the delivery line is not large, it needs to be opened and closed tens of thousands of times a day. Ignore the premature maintenance of the dental lining. Excessive wear and tear will cause insufficient tooth discharge, no paper discharge and paper peeling failure.