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Support roller for the main roller of sheetfed offset press
Source: China Bearing Network Time: 2018-06-06
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Following the development of the history of sheetfed offset presses; the main roller bearings have also experienced many innovations, from the recent brass plain bearings to roller bearings; from needle bearings to roller bearings; from single bearings to combined bearings; Ring bearing to three ring pain bearing. The accuracy of the roller bearing is getting higher and higher; the device is more and more convenient; the protection is more and more simple.
One. Needle bearing needle roller bearing rigidity is much better than tapered roller bearing because of its small roller diameter; and the double-column misaligned needle roller bearing developed by the bearing company makes its rigidity comparable to that of copper sleeve sliding bearing. The comparison of the needle bearing; the needle roller grouping of the needle roller bearing used for the printing machine roller support is higher than the general one. The needle roller grouping of the general needle roller bearing is in units of 2 μm; and the needle roller grouping of the printing machine is 1 μm. For the unit. In this way, after selecting the appropriate needle roller grouping, the bearing clearance can be less than 1μm; such work accuracy is required by high-quality printers. There are more groupings of needle bearings; this will naturally reduce the processing requirements for wallboard.
two. The use of roller bearing needle roller bearings; still makes printer manufacturers annoyed with the need for high-precision jackets; and experienced installations to find suitable needle roller groups. In order to deal with this problem; bearing manufacturers developed The roller bearing support plan of the outer ring integrated flange (Fig. 2). The roller bearing can be pre-tensioned to achieve good precision and rigidity. It can also use the tapered inner ring (Fig. 3); Work clearance. This treatment plan is fully capable of completing the zero clearance of the printer roller bearing. The flanged outer ring handles the device and smooth problems for the printer manufacturer. Manroland, Heidelberg, Libye, Japan And the domestic Beiren models widely use this bearing. Its roller bearing support plan has become the main flow plan of the roller support in the printing machine.
three. The integrated unit is the same as the automotive industry and other industries; printer manufacturers also need to supply more simple modular components like the same fine product supplier to reduce the errors and moments of factory assembly; reduce the rework rate; then promote power, Decrease cost. In order to satisfy this demand, the bearing manufacturer provides the roller support unit with higher precision and simpler device and protection. For example, the three-ring pain bearing unit developed by the bearing company (Fig. 4). The bearing unit integrates the bearing and the painful sleeve; not only has the effect of supporting the roller; but also can complete the function of the roller gathering and the pressure and the registration. Its superiority has been widely accepted by the printer manufacturer. The models of KBA and MAN Roland And Heidelberg's new models; the bearing unit is now used on the plate cylinder or blanket cylinder. In the old model modification; this three-ring bearing support is now the first choice. Currently there is no performance. Upper, device application, and protection have better plans than this bearing unit. The use of labyrinth seals and cylindrical rollers makes it smooth for oil; it can also be smoothed with grease. And life-long protection. Excellent smoothness also makes the life of this bearing the longest in various plans. It makes the printer manufacturer's demand for precision move from its own processing and equipment production line to the bearing of fine products such as bearings. Production line. This is also in line with the intensification of modern industry.
The above is the various treatment plans for the main roller support of the printing machine. The printing machine has high requirements for its own precision; the support for the rotating and linear moving parts has high requirements. The above processing plan can fully handle the domestic printing machine manufacturers. It is more demanding of its own characteristic products.
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