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Heidelberg offset printing machine is stable and reliable and durable due to world-renowned. Since the early 1990s, the author has been engaged in equipment operation and management in the front line of printing companies, and has formed an indissoluble bond with Heidelberg CD102. After long-term production practice, the author found that the Heidelberg CD102 Feida can be improved by the following methods. Improved Feida rotary valve
In actual production, the Heidelberg CD102's Feida rotary air-distribution valve used by many printing enterprises in Hubei has experienced different degrees of wear and tear, and some have caused the universal joint spring due to the stuck-up rotary valve. The pin is broken and even the cardan shaft is broken.
1. The cause of the problem
After analysis, the author believes that the reasons for the easy wear of the Feida rotary gas distribution valve are as follows.
(1) There are design defects
The feeder rotary core of Heidelberg CD102 is made of copper, and the valve casing is made of aluminum alloy. The inner wall of the valve hole that is in contact with the copper core is hardened. The copper core and the valve hole are gap-fitted, and the 16004 bearing at both ends of the copper core has an interference fit with the round hole. The outer diameter of the copper core is only several tens of micrometers smaller than the inner diameter of the valve hole (the outer diameter of the bearing), and the precision is matched.
In the process of visiting the printing enterprise, the author saw that many Heidelberg CD102 Feida rotary gas valves have different degrees of sloshing. Since the Heidelberg CD102 Feida rotary manifold has a copper core sleeve on one long shaft, this long shaft is integrated with the paper machine camshaft. Once the feeder rotary valve is stuck, there is no design on the valve housing. Pull out the pin puller of the valve casing, and the three aluminum end cap screw holes are pulled out with the pin puller, so only the screwdriver and the crowbar can be used to pry the valve casing out a little. When the valve casing is forcibly pulled out, the long shaft will inevitably be bent and deformed. After reinstalling the valve casing, under the influence of the curved long shaft, the Feida rotary gas valve will sway as a whole, which intensifies the copper core. abrasion. Due to the long axis bending, the calibration is very difficult. Even if a set of Feida rotary valve is replaced, the sloshing problem can not be solved. It will not be long before the Feida rotary valve will wear and scrap.
(2) Improper maintenance
In actual production, due to the competition in the printing market, Heidelberg CD102 will be used to print a large number of uncoated paper (writing paper, offset paper or even newsprint). Such papers are dusty and hairy, and a large number of double-sided printing The dusting particles are sucked in by the fly-by-rotation diverter valve. The maintenance manual requires the printing company to take out the valve casing at least once a month to remove the paper ash accumulated on the surface, but the printing company often does not clean according to the maintenance manual due to cost, etc., thus causing the Feida rotary gas valve to wear and even The phenomenon of death.
In addition, the southern region has a humid climate and high air humidity. From the perspective of cost, some small and medium-sized printing companies cannot guarantee the constant temperature and constant humidity environment required for printing through air conditioning. The Feida rotary gas distribution valve itself and the bearings at both ends are Metal material, easy to rust in humid environment. When Feida is running, the rust powder will scratch the inner wall of the copper core and the valve hole, causing string and air leakage, thus affecting Feida's paper feeding function.
2. Improved method
Based on the above analysis, the author believes that the following improvements can be made.
(1) Disconnect the long shaft of the set copper core from the feeder camshaft and connect it to the camshaft through the coupling.
The original long axis is divided into two. When the long axis becomes shorter, the risk of bending deformation is greatly reduced. Even if the shaft is deformed, the Feida rotary air valve is self-contained, and there is no sloshing phenomenon, and the Feida rotation is divided. Once the gas valve is stuck, simply remove it and knock out the copper core. The disassembly is very simple.
(2) Improve and optimize the material of the valve casing
It is recommended that the valve housing be made of a metal material with a better hardness, and the valve housing round hole is designed as a separate column hole, which is placed on the Feida rotary gas distribution valve body. Therefore, once the Feida rotary gas valve is worn, it will only damage the copper core. Even if the valve hole is damaged, it can be replaced separately, and the entire casing is not affected, thereby greatly reducing the cost.
(3) Appropriate increase of clearance between valve hole and copper core
After the experiment, the Feida rotary gas valve is seriously worn, the Heidelberg CD102 can still print at 12000 sheets/hour. It can be seen that the gap between the valve hole and the copper core is increased (approx. 0.05mm), which will not affect the feeder. The paper function, and the possibility of the Feida rotary valve being stuck is greatly reduced.
(4) Printing enterprises should carry out standardized management
The printing company should ensure constant temperature and constant humidity in the workshop, and regularly maintain the Feida rotary air valve to avoid its jam.
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