The maintenance of offset presses has always been a major problem for printing companies, especially for nearly 100,000 small offset press users across the country. They have less theoretical experience, and some do not have the concept of maintaining equipment at all. On the one hand, helpless. The following will take Weihaitiantian WH47 series offset printing machine as an example to introduce the characteristics and maintenance knowledge of small offset printing machine.
Weihaitiantian WH47 series offset printing machine is a small offset printing equipment with large domestic output and usage, which represents the technical level of small offset printing machine to a certain extent. It is worth noting that among the users who visited Weihai Bintian, although they had been trained when purchasing equipment, more than 70% of the users did not systematically and regularly maintain the equipment in use, which caused a waste of machine resources.
In fact, the reason is very simple. According to statistics, about 33% of users of small offset printing equipment are directly transferred from lead printing, and some are individual enterprises that print small jobs (including short-color printing) (about 75% of users in Jiangsu and Zhejiang) Above), they still lack understanding of the basic principles of offset printing. Of course, in terms of equipment maintenance, they are not as professional as the operators of large offset printing equipment. These problems are embodied in two aspects: random operation and abnormal maintenance.
The operation is arbitrary, and the reasons are: one is frequent substitution; the other is improper employment. This requires the enterprise to make reasonable adjustments in terms of the employment system and job arrangement, etc., to make the personnel on board relatively stable.
The maintenance is not normal, and the training explanation is not in place, so that the user does not really pay attention to the maintenance work of the machine. Only training is in place can improve the comprehensiveness of maintenance; users pay attention to it, can improve the quality of maintenance, and, in order to make equipment long-term, efficient and stable operation, maintenance quality is very important. The following is a brief introduction to the maintenance content of small offset presses.
The maintenance of small offset presses is different from the large offset presses with automatic lubrication system, because of its simple structure, the maintenance is relatively convenient and simple. The maintenance of the small offset press can be divided into three items: oil injection, regular self-check and cleanliness.
Oil-filled small offset presses are mostly manual oil-filled, with many oil points. When refueling:
1. You must ensure that you refuel at least once a week (working 8 hours a day).
2. The moving parts, such as cams, bearings, gears and gears, linkage rods and shafts, and the rotating parts at both ends of the ink roller should be lubricated with oil.
3. Pay attention to whether the oil eye is clogged and there is no oil inflow; the oil viscosity should not be too thin.
4. Pay attention to some important parts that are easy to miss, such as: 3 oil eyes of the impression cylinder gripper shaft, 2 oil eyes of the elevator shaft end, etc.
5. The ink roller needs to be disassembled once every six months, and grease or high-speed lubricating oil should be applied between the worm gear and the follower.
6. The spring is regularly lubricated and lubricated, and the manual transmission wheel should be greased.
Periodic inspection 1. Check the pressure of the plate water roller and plate ink roller (ink bar indentation does not exceed 3-3.5mm).
2. Check the pressure between the plate cylinder and the rubber cylinder. Requirements: The new blanket is 1.65 mm thick and the plate thickness is 0.1-0.15 mm.
3. Check the overall pressure and parallelism of the elevator.
4. Check whether the bearings at both ends of the water roller are worn (oil after cleaning).
5. Check the screws everywhere for looseness and abnormal noises. And do promptly find problems and deal with them in time.
Cleanliness 1. Use an air gun to occasionally remove paper dust and paper powder left and right in the machine, such as the inside of the platen roller of the elevator, the gripper of the impression cylinder, and the double-sheet detector at the paper-continuation site.
2. The surface of the sensor (electric eye) should be wiped with cotton cloth dipped in clean water (alcohol).
3. Regularly clean the grease and dirt between the gears.
4. Clean the air pump regularly with the correct method. Regularly clean the water stain inside the clamp. Dirt, lubricate.
5. The electromagnet must not work with oil; the switchboard and various lines should be kept clean and dry.
Objectively speaking, the key to maintaining the offset press lies with the user. If the machine is running for 24 hours because of the large amount of business, whether it is parts or electrical components, it will inevitably generate heat and accelerate the wear of the equipment. Coupled with long-term oil shortage or abnormal operation, it will inevitably cause the wear of spare parts, affect the accuracy of the machine, and cause various failures. As the saying goes: the sharpener does not cut the woodworker by mistake. The maintenance of the machine needs to cultivate salty habits, some tasks are handy, such as the cleaning of the machine. Our company has a WH47SNP two-color coding offset printing machine produced in 1996 in Weihai Bintian. Over the years, there have been basically no problems and no replacement parts. At present, printing 22g square meters of oil seal paper is still a line, and printing coated paper is more colorful and clear. Its experience is that no matter how busy it is, it is necessary to do maintenance work.
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