Sheet-fed offset printing presses are becoming more and more the main products of printing machinery due to the superiority of their structure, and the requirements for printing quality are also constantly improving. Domestic offset press manufacturers have also developed from the original production of single-color machines and two-color machines to four-color machines and multi-color machines. Each color group of sheet-fed offset press is mainly composed of plate cylinder, rubber cylinder, pressure cylinder, transfer cylinder and other ink and accessory systems. The running accuracy of the main cylinder directly affects the quality of printing, and there is a direct relationship between whether overprinting, netting, and coloring will occur. Domestic and foreign well-known printer manufacturers have increasingly higher requirements on the running accuracy of the main drum. The bearings that support the main cylinder play a vital role. In order to improve the quality of the printing press and add greater added value, many printer manufacturers will increase the requirements of the bearings at all costs.
With the development of sheetfed offset press history, the main drum bearing has also undergone many changes. From the earlier brass sliding bearings to roller bearings, from needle bearings to roller bearings, from single bearings to combined bearings, from two-ring bearings to three-ring eccentric bearings. The accuracy of the roller bearings is getting higher and higher, the installation is more and more convenient, and the maintenance is more and more simple.
One. Needle bearing
The rigidity of needle roller bearings is much better than that of tapered roller bearings due to their small roller diameter, and the double row needle roller bearings developed by the bearing company make their rigidity comparable to copper sleeve sliding bearings. Compared with the ordinary needle roller bearings, the needle roller group applied to the needle roller bearings supported by the printer cylinder is higher than the ordinary needle roller bearings. The needle roller grouping of ordinary needle roller bearings is in units of 2 μm, while the needle roller grouping used in printers is in units of 1 μm. In this way, by selecting the appropriate needle roller grouping, the working clearance of the bearing can be made less than 1 μm. Such running accuracy is just what high-quality printers need. And the needle roller grouping used by the printer can be more than the ordinary needle roller bearing grouping, so the processing requirements for the wallboard can naturally be reduced.
two. Roller bearing
The use of needle roller bearings still makes printer manufacturers annoy the need for high-precision processing jackets and the need for experienced installers to find suitable needle rollers. To solve this problem, bearing manufacturers have developed roller bearing supports with integrated flanges on the outer ring. Roller bearings can achieve good accuracy and rigidity by preloading. And the inner ring with taper can also be used to arbitrarily adjust the working clearance of the bearing. This kind of solution can fully meet the requirement of zero clearance of the roller bearing of the printing machine. And the flanged outer ring solves the installation and lubrication problems for printer manufacturers. Manroland, Heidelberg, Japan Ryubi and domestic Beiren models widely use this bearing. Its roller bearing support solution has become the mainstream solution for roller support in printers.
three. Integrated unit
Like the automotive industry and other industries, printing machine manufacturers also need suppliers of precision products like bearings to provide simpler modular components to reduce factory assembly errors and time, reduce rework rates, and thereby improve efficiency and reduce costs. In order to meet this demand, bearing manufacturers have provided roller support units with higher accuracy and easier installation and maintenance for the main roller support. Such as the three-ring eccentric bearing unit developed by the bearing company. This bearing unit integrates bearings and an eccentric sleeve, which not only has the function of supporting the roller, but also can realize the functions of roller clutch pressure and registration. Its superiority has been widely accepted by printer manufacturers. KBA, Manroland models and Heidelberg's new models have already used this bearing unit on plate cylinders or blanket cylinders. In the modification work of the old model, this kind of three-ring bearing support has become the first choice. At present, there is no better solution in terms of performance, installation, use and maintenance than this bearing unit. The use of labyrinth seals and cylindrical rollers makes it possible to carry out oil lubrication or grease lubrication, and it is maintenance-free for life. Excellent lubrication also makes the life of this bearing the longest among various schemes. It makes the printing machine manufacturer's precision requirements move from its own processing and installation production lines to bearing production lines that produce precision products such as bearings. This is also in line with the intensification of modern industry. The above are various solutions for the support of the main cylinder of the printing press. Due to its own precision requirements, the printing machine has high requirements for the support of rotating and linear moving parts. The above solutions can completely solve the needs of domestic printer manufacturers to develop their own more distinctive products.
Whistling Kettle ,which is necessary for your kitchen and home. Perfect for enjoying the coffee ,tea or other drinking.
1: The kettle will whistle loudly when boiling,a good reminder feature for you .
2:Excellent quality non-slip handle ,give you a comfortable touch feel,and is ergonomically designed for optimal comfort .
3: Three kind of bottom for you to choose, single layer,triple layers and five layers. Multilayer bottom can heats up quickly and evenly.
4:Whistling kettle can une on any stovetop, including induction heating, smooth glass top, gas and electric stoves.
Description of the whistling kettle
Body: SS201 or SS304
Handle: Stainless steel + silicone or Bakelite Handle
Lid: SS201 or SS304 + + silicone or Bakelite Handle
Bottom:
Single bottom - SS430
3 layer bottom - SS430+Aluminium+SS430 or SS304
5 layer bottom - SS430+Aluminium+Iron+Aluminium+SS430 or SS304
Welcome to provide the OEM requirement and ask for the quotation.
Will try the best to give you a good service.
Whistling Kettle
Stainless Steel Whistling Kettle,Stovetop Induction Whistling Kettle,Whistling Kettle With Black Handle,Stainless Steel Tea Kettle
Jiangmen Wellway Houseware Co.,Ltd , https://www.wellwayhouseware.com