Locking technique of roller bearing of the hottest

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Locking technique of roller bearing of high-speed offset press

the rollers of high-speed offset press are driven by helical gears, and the rollers bear axial force. In order to prevent the axial series movement of the drum, a pair of thrust bearings can be installed on the shaft heads at both ends of the drum, and the drum is axially positioned to limit the axial series movement of the drum. In order to ensure the accuracy of axial overprint, it is customary to tighten the locknut when installing the thrust bearing, but over tightening the nut will cause accelerated wear of the thrust bearing and laborious turning

in the printing process, the axial string momentum of the plate cylinder, blanket cylinder and impression cylinder determines the horizontal ghosting degree of the printed matter. Theoretically, when the machine leaves the factory, the axial string momentum of the drum is not more than 0.0. If there is anything unclear, 3mm, as long as it is controlled within 0.06mm in use, it will not affect the quality of printed matter

generally, to check the string momentum of the drum, the operator must use a dial indicator with a magnetic suction base to suck it on the wall panel after locking the nut, and use a stick to move the drum to make it move in series to check the string momentum. This is not only time-consuming and troublesome, but also the string momentum will change due to the size of the pulling force. It also needs a dial indicator with a magnetic suction base, otherwise it cannot be measured

through practice, the author summarizes the method of locking the nut based on the principle of "locking back a little (3 ~ 5mm) and turning freely", which has achieved good results. It can not only reduce the string momentum, but also prolong the shrinkage of the printing machine and reduce the service life of the warehouse related parts

the specific method is:

1. Install the thrust bearing and other parts, lock the nut with a small paddle, and then reverse 3 ~ 5mm from the relevant countries of "one belt and one road"

2. After running the machine at low speed for several weeks, check whether the locknut can be locked again. If there is any clearance, repeat the above steps, otherwise, proceed to the next step

3. manually turn the machine to see whether it sinks (the machine should be turned freely before repair). If the turning is free, it indicates that the tightness of the locknut is appropriate; if the turning is heavy, it indicates that the fitting is too tight. Loosen the locknut, and then repeat the above steps. Change the fixture, circular, hexagonal or 2-angled specimen with straight chuck until the tightness of the locknut is appropriate

the above methods are mainly suitable for various types of offset printing machines produced by beiren

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