The level of the machine is a critical step in the commissioning of the machine. All rotary rollers of the machine must be level to maintain the smooth operation of the machine. If the machine is not horizontal, the work of bearings and gears will be seriously affected, and the quality of printed products will be destroyed.
Both the paper feeding section and the delivery section serve the printing unit, so the printing unit is the absolute benchmark for debugging the entire machine. When looking for a level, you should first find the level of the printing unit, and then find the level of the paper feeding section and the receiving section.
To find the level of printing units should first find the bottom level, the level of the bottom is not good, the above level can not be guaranteed. How to find the bottom level? The base tray generally has two guide rails: one for the transmission surface and one for the operation surface. Because the transmission system of the machine is mostly transmission gears, the vast majority are mounted on the transmission surface. If the level of this side can not be guaranteed, the machine will not be able to operate smoothly. So relatively speaking, the level of the transmission surface is more important than the level of the operating surface. From the above analysis, it can be seen that the level of the transmission surface (line level) is an absolute reference for the entire machine level, and the level of the two bottom brackets is an absolute reference for the entire machine level. According to the relationship of the benchmarks, when looking for a level, you should first find the level of the bottom surface of the transmission surface, then find the level of the two bottom brackets, and then find the level of height direction. Generally, as long as the bottom level of the machine is guaranteed, there should not be any problem in the height direction because the level of the height direction is directly related to the precision of the machining and installation of the machine. Otherwise, some parts may have to be reinstalled. If it is serious, it must be replaced. equipment. Therefore, the level of the height direction is used to check the level of the machine base. When the user is installing, the level of the bottom of the machine must also be adjusted.
When looking for the level of the bottom surface of the transmission, according to the principle of two points and one line, first determine the position of one of the points, and then adjust another point. When the two points are basically on a horizontal line, the horizontal accuracy of the machine can be further improved by the method of five schools. After finding the level of the bottom surface of the transmission surface, look for the horizontal level of the operating surface and the transmission surface. Note that the horizontal position of the transmission surface cannot be moved when the level of the operation surface is found. Then find the level between the entire operating surface and the transmission surface. Using the benchmark relationship to further analyze the level of the bottom bracket, it can be seen that the level of the drive surface bottom bracket is the absolute reference of the bottom surface level, and the horizontal level between the operation surface and the transmission surface is the relative base of the bottom surface level, so the adjustment must be based on the benchmark. In order, not irrelevant.
When looking for a level, a dedicated spirit level meter is generally used. The level meter must be in a good working condition. Otherwise, the level of the machine cannot be detected. Therefore, the level meter should be sent to the measurement center for calibration on a regular basis.
After finding the bottom level, you can put the level gauge on the impression cylinder to check whether the level is horizontal. Sometimes the level gauge is placed on the fountain roller and the fountain roller to check if the ink path and the water path are parallel to the axis of the impression cylinder.
The horizontal reference of the printing unit varies from machine to machine. Some machines have a horizontal reference for the first group, some machines have a horizontal reference for the second group, and some machines have a combination of two for the horizontal reference. Therefore, the specific machine should be set to a horizontal reference according to the installation instructions.
After the horizontal benchmark is determined, other printing units are relative benchmarks. The level of the benchmark is very important. If the level of the benchmark is not adjusted properly, it will bring great difficulties to the level adjustment of the follow-up unit. Therefore, the level of the benchmark must be corrected repeatedly, and the higher the precision, the better.
It is worth noting that: the base of the spirit level and the parts used to check the levelness should be strictly kept clean, otherwise it will cause measurement errors. These parts are best scrubbed repeatedly with gasoline or warm water.
The specific operations for finding the level are as follows:
1 Check the accuracy of the spirit level, place the level meter on a plane and record its reading. (If the bubble is on one end of the level, adjust the level of the plane so that the bubble moves to the level above the level, not necessarily Adjust to the middle position, then turn the level meter 180Â°, measure again in the original place. If the two measurement results are the same or the error is extremely small, then the accuracy of the level meter can be considered to meet the requirements. Otherwise, the cause should be carefully searched.
If the contact surface is not suitable, then change the plane to retest; if the cleanliness of the contact surface is not enough, it should be cleaned and then measured; also note that the position of the positive and negative measurements are on the same line. If none of these reasons exist, replace the spirit level.
2 First adjust the supporting screw under the machine to the middle (slightly below), then measure the level of the machine (there is a dedicated measurement plane on the bottom). Since the measurement surfaces are all parallel, the results should be the same in any measurement plane as long as the operation is correct. In a plane, two vertical measurements should be made. If the gas pool moves toward the measurement site, it indicates that the site is in the highest position. The screw can be rotated to move the machine downwards; if a bubble moves to the measurement site, one cannot Displacement to the measuring part means that the part is not the highest position. Measure the other measurement planes until you find the measurement plane that is moving toward the measurement location. Adjust as described above. If you can find the measurement plane where the air bubble moves in the opposite direction from the measurement location, it means that the location is the lowest position of the machine. You can raise the screw below it, but you should generally find the highest position. If the measurement results in the two measurement planes are exactly the same (in both directions), it means that one side of the machine is at the same time high or low at the same time. If the operation plane is high, the support screws of the site should be synchronously rotated at the same time. Horizontal measurement of the base of the machine is only the first step in the leveling process. The horizontality of the impression cylinder should then be measured. If it does not meet the requirements, the level of the base should be re-calibrated. The machine can also be used to detect the machine. The level of accuracy, and finally the weight of the machine to determine whether the machine's level adjustment is appropriate.