China's printing industry has introduced a large number of advanced printing presses. These printers all have the features of high degree of automation, high printing speed and good product quality. However, with the increase of the service life, the degree of wear and damage of the equipment is also increased. In addition to natural wear and tear, some parts are accelerated wear and damage due to the poor operating conditions of the equipment. If the normal maintenance and maintenance of the printing press cannot be performed normally, the technical performance of the equipment will be reduced, thereby reducing the printing quality. Improving the integrity of equipment, ensuring that printing quality does not decline, smooth production, and reducing losses caused by improper maintenance all further explain how important maintenance of printing equipment is.
The following points fully explain the importance and necessity of equipment maintenance:
1, the oil road
In the oil circuit, the lubrication of production equipment is an important part of equipment maintenance. Keeping the printer's oil path open is a matter of lubrication of the moving parts of the entire machine. It is necessary to regularly replace the oil and clean the oil filter device so that the oil flowing into the pipe does not contain impurities and block some of the oil lines. In particular, a needle roller bearing supporting a roller of a unit can cause long-term dry friction between the bearing and the roller shaft if there is no lubrication and cooling of the oil. When an abnormality is found, the shaft and the inner ring of the bearing are cemented. Lighter replacement of the inner ring; severe roller shaft damage.
2, mechanical angle
From a mechanical point of view, only the operator of the equipment will intensify the maintenance and maintenance, so that the mechanical moving parts of the machine will remain clean and lubricated and operate flexibly, so that the technical performance of the equipment can be fully utilized and the equipment can be kept intact. For those who have used Heidelberg presses, Heidelberg multi-color printing presses have the most easily worn out rollers and water roller bearing housings and pressure regulating worm seats. The ink is particularly prone to accumulate on the bearing housing and its lifting mechanism and worm seat. It is a unit of printing gold and silver ink. If it cannot be cleaned in time, the metal particles will accelerate the wear of the bearing seat or worm seat. It usually takes several hours to remove the worn ink roller bearing housing from the machine wall, because the bearing housing is fixed on the lifting mechanism by the shaft retaining ring. The space is extremely narrow and has only a few centimeters of loose position. It is also time consuming for the mirror to find the two holes in the retaining ring, remove the retaining ring, and reinstall the bearing housing and its lifting mechanism. The same applies to the disassembly and water roll holders. Different multi-color offset presses have different ways of installing pressure regulating worm seats: one is that the fixing bolts of the fixing base are fixed and locked from the outer wall (easier to assemble and disassemble); the other is that the fixing bolts are from the machine wall. To lock outwards (most of them use this method), the space is small, and it is difficult to assemble and disassemble and maintain. If the personnel in the machine understand this, they should always be maintained and kept clean, and the accumulated ink on the machine should be promptly removed, so that the bearing seat and the worm seat do not need to be replaced frequently. This will not only reduce downtime, increase production efficiency, but also save on the replacement cost of spare parts.
In order to prevent the printed matter from getting dirty, the offset printing machine generally uses dusting. If the amount of dusting is too large and it cannot be cleaned in time, it will cause some troubles, such as failure of the automatic lifting device for paper delivery and damage of the shaft mechanism of the paper-reducing deceleration wheel. It is worth mentioning that the suction and deceleration wheels of the Heidelberg offset press delivery device, if the powders around the axle and the suction deceleration belt cannot be removed in time, the powder and the engine oil will be mixed to form sludge, and the sludge will stick and suck for a long time. The air-reducing axle does not rotate. In order to protect the motor that drives the deceleration wheel shaft, the gear in the deceleration mechanism is forced to peel off or sweep the teeth. The motor is related to the circuit of the dampening system. In the event of a failure, the whole machine will stop. To troubleshoot, you need to install a new gear. Therefore, usually more cleaning of these institutions, otherwise, the machine can only be printed thick - play a supporting role, if the printing paper, because the suction deceleration wheel does not work, it will cause the paper take-up mechanism to produce chaos, reduce production efficiency .
3, electrical aspects
Heidelberg offset presses are equipped with many safety devices and are very sensitive. With a slight touch, the entire machine will stop working. Sometimes too much dust accumulates at the relay contacts inside the electrical control box of the machine, causing poor contact of the relay contacts and rendering the machine inoperable.
There are many other similar problems, such as the excessive accumulation of dust in the motor, the movement and reset of the image of the carbon brush holder, and the pressing force of the spring on the carbon brush on the carbon brush holder, so that the carbon brush and the commutator copper head Poor contact can also make the machine difficult to operate.
4, gas path
The four-color and five-color offset presses produced by Heidelberg in the late 1980s all use starters to control the cylinder clutch pressure, the ink roller, the water roller's printing plate, and the ink transfer roller's ink transfer. Each unit of the multi-color printing press has several 2/2-way control valves to control these actions. The control of the piston movement of the cylinder can realize the actions of the ink roller, the water roller separation plate, and the ink transfer roller. Sometimes, due to the water in the control valve or the air cylinder, the air valve seal may be damaged, which may cause the control valve or the air cylinder to leak. This makes the ink roller and the water roller from the bad situation. In addition, due to the accumulation of ink in the action control mechanism, these movable parts are not flexible in movement, which in turn increases the burden of the control valve and the gas cylinder, resulting in the control valve being vulnerable to damage and the piston of the gas cylinder being more easily deformed. In addition, due to the aging of the gas pipeline hose, the pipeline leaks, and the pipeline pressure drops rapidly, making the control valve unable to open, and the clutch pressure action cannot be completed. If the pressure is increased, the life of the image compressor will further accelerate the aging of the hose. Therefore, the problem of poor landing gears due to the change in the pressure of the valve or the air cylinder alone is not thorough, and these action mechanisms are frequently cleaned to maintain the flexibility of operation. To ensure that the gas path does not leak, no water is a long-term solution.
All these problems are caused by poor maintenance. Therefore, it is very important to strengthen maintenance and do daily, weekly and monthly maintenance. It will not only extend the service life of the machine, but also increase the production efficiency.
The following points fully explain the importance and necessity of equipment maintenance:
1, the oil road
In the oil circuit, the lubrication of production equipment is an important part of equipment maintenance. Keeping the printer's oil path open is a matter of lubrication of the moving parts of the entire machine. It is necessary to regularly replace the oil and clean the oil filter device so that the oil flowing into the pipe does not contain impurities and block some of the oil lines. In particular, a needle roller bearing supporting a roller of a unit can cause long-term dry friction between the bearing and the roller shaft if there is no lubrication and cooling of the oil. When an abnormality is found, the shaft and the inner ring of the bearing are cemented. Lighter replacement of the inner ring; severe roller shaft damage.
2, mechanical angle
From a mechanical point of view, only the operator of the equipment will intensify the maintenance and maintenance, so that the mechanical moving parts of the machine will remain clean and lubricated and operate flexibly, so that the technical performance of the equipment can be fully utilized and the equipment can be kept intact. For those who have used Heidelberg presses, Heidelberg multi-color printing presses have the most easily worn out rollers and water roller bearing housings and pressure regulating worm seats. The ink is particularly prone to accumulate on the bearing housing and its lifting mechanism and worm seat. It is a unit of printing gold and silver ink. If it cannot be cleaned in time, the metal particles will accelerate the wear of the bearing seat or worm seat. It usually takes several hours to remove the worn ink roller bearing housing from the machine wall, because the bearing housing is fixed on the lifting mechanism by the shaft retaining ring. The space is extremely narrow and has only a few centimeters of loose position. It is also time consuming for the mirror to find the two holes in the retaining ring, remove the retaining ring, and reinstall the bearing housing and its lifting mechanism. The same applies to the disassembly and water roll holders. Different multi-color offset presses have different ways of installing pressure regulating worm seats: one is that the fixing bolts of the fixing base are fixed and locked from the outer wall (easier to assemble and disassemble); the other is that the fixing bolts are from the machine wall. To lock outwards (most of them use this method), the space is small, and it is difficult to assemble and disassemble and maintain. If the personnel in the machine understand this, they should always be maintained and kept clean, and the accumulated ink on the machine should be promptly removed, so that the bearing seat and the worm seat do not need to be replaced frequently. This will not only reduce downtime, increase production efficiency, but also save on the replacement cost of spare parts.
In order to prevent the printed matter from getting dirty, the offset printing machine generally uses dusting. If the amount of dusting is too large and it cannot be cleaned in time, it will cause some troubles, such as failure of the automatic lifting device for paper delivery and damage of the shaft mechanism of the paper-reducing deceleration wheel. It is worth mentioning that the suction and deceleration wheels of the Heidelberg offset press delivery device, if the powders around the axle and the suction deceleration belt cannot be removed in time, the powder and the engine oil will be mixed to form sludge, and the sludge will stick and suck for a long time. The air-reducing axle does not rotate. In order to protect the motor that drives the deceleration wheel shaft, the gear in the deceleration mechanism is forced to peel off or sweep the teeth. The motor is related to the circuit of the dampening system. In the event of a failure, the whole machine will stop. To troubleshoot, you need to install a new gear. Therefore, usually more cleaning of these institutions, otherwise, the machine can only be printed thick - play a supporting role, if the printing paper, because the suction deceleration wheel does not work, it will cause the paper take-up mechanism to produce chaos, reduce production efficiency .
3, electrical aspects
Heidelberg offset presses are equipped with many safety devices and are very sensitive. With a slight touch, the entire machine will stop working. Sometimes too much dust accumulates at the relay contacts inside the electrical control box of the machine, causing poor contact of the relay contacts and rendering the machine inoperable.
There are many other similar problems, such as the excessive accumulation of dust in the motor, the movement and reset of the image of the carbon brush holder, and the pressing force of the spring on the carbon brush on the carbon brush holder, so that the carbon brush and the commutator copper head Poor contact can also make the machine difficult to operate.
4, gas path
The four-color and five-color offset presses produced by Heidelberg in the late 1980s all use starters to control the cylinder clutch pressure, the ink roller, the water roller's printing plate, and the ink transfer roller's ink transfer. Each unit of the multi-color printing press has several 2/2-way control valves to control these actions. The control of the piston movement of the cylinder can realize the actions of the ink roller, the water roller separation plate, and the ink transfer roller. Sometimes, due to the water in the control valve or the air cylinder, the air valve seal may be damaged, which may cause the control valve or the air cylinder to leak. This makes the ink roller and the water roller from the bad situation. In addition, due to the accumulation of ink in the action control mechanism, these movable parts are not flexible in movement, which in turn increases the burden of the control valve and the gas cylinder, resulting in the control valve being vulnerable to damage and the piston of the gas cylinder being more easily deformed. In addition, due to the aging of the gas pipeline hose, the pipeline leaks, and the pipeline pressure drops rapidly, making the control valve unable to open, and the clutch pressure action cannot be completed. If the pressure is increased, the life of the image compressor will further accelerate the aging of the hose. Therefore, the problem of poor landing gears due to the change in the pressure of the valve or the air cylinder alone is not thorough, and these action mechanisms are frequently cleaned to maintain the flexibility of operation. To ensure that the gas path does not leak, no water is a long-term solution.
All these problems are caused by poor maintenance. Therefore, it is very important to strengthen maintenance and do daily, weekly and monthly maintenance. It will not only extend the service life of the machine, but also increase the production efficiency.
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