ZEXIN factory-7

Concept: Bushing is an accessory used outside mechanical components to achieve sealing, wear protection, etc. It refers to a ring sleeve that acts as a gasket. In the field of valve applications, the bushing is inside the valve cover, and corrosion-resistant materials such as polytetrafluoroethylene or graphite are generally used for sealing.

Introduction: Among moving parts, long-term friction causes parts to wear. When the gap between the shaft and the hole wears to a certain extent, parts must be replaced. Therefore, designers choose materials with lower hardness and higher wear resistance when designing. The best material is the shaft sleeve or bushing, which can reduce the wear of the shaft and seat. When the shaft sleeve or bushing is worn to a certain extent, replace it, which can save the cost of replacing the shaft or seat. Generally speaking, bushings and The seat uses an interference fit, and the shaft uses a clearance fit, because wear cannot be avoided no matter what, and it can only extend the life. Shaft parts are relatively easy to process; there are also some new designers who don’t like this design. I think this will increase the cost during manufacturing, but after a period of use, it still needs to be modified according to this method during maintenance. However, the modification can easily cause the accuracy of the equipment to decrease. The reason is very simple. Secondary processing cannot guarantee the center of the seat hole. To supplement the position, the bushing is used to replace rolling bearings in places with low speed, high radial load and high clearance requirements (such as camshafts) (in fact, the bushing is also a kind of sliding bearing), and the material requires low hardness. It is also wear-resistant. The inner hole of the shaft sleeve has been ground and scraped to achieve higher matching accuracy. There must be a lubricating oil groove on the inner wall. The lubrication of the shaft sleeve is very important. If dry grinding occurs, the shaft and sleeve will soon be scrapped. It is recommended to scrape the inner hole wall of the bushing during installation, which can leave many small pits. Different models of enhanced lubrication bushings and bushings are selected according to different industrial and mining conditions. The most important conditions are: pressure, speed, pressure speed product, lubrication state, and load properties. Bushing quick and easy automatic selection is included

Function: The bushing has high flexibility in use and can play many functions. Generally speaking, the bushing is a type of component that protects equipment. The use of bushings can reduce equipment wear, vibration and noise, and has anti-corrosion effects. The use of bushings can also facilitate the maintenance of mechanical equipment and simplify the structure and manufacturing process of the equipment.

The role of the bushing in actual work has a lot to do with its application environment and purpose. In the field of valve applications, the bushing is installed in the valve cover to cover the valve stem to reduce valve leakage and achieve a sealing effect. In the field of bearing applications, the use of bushings can reduce the wear between the bearing and the shaft seat and avoid the increase in the gap between the shaft and the hole.

Material: The bushings are mostly made of soft metal, rubber, nylon and non-metallic polymers. These materials are relatively soft in texture and low in price. In various harsh working environments, the bushing withstands vibration, friction and corrosion to protect the wrapped components, and the bushing itself is easy to replace after damage, with low cost and good economy.

Selection factors: Bushings have a wide range of uses and many types. To choose a suitable bushing, you must consider its purpose of use. Different types of bushings are selected for different working conditions. The main conditions considered in bushing selection are the pressure, speed, pressure-speed product and load properties that the bushing needs to withstand. In addition, whether the bushing is lubricated and lubricated also determines its use effect and life.

Practical application: used in: packaging machinery, textile machinery, mining machinery, metallurgical machinery, printing machinery, tobacco machinery, forging machinery, various machine tools and interchangeable mechanical transmission connections. For example: pulleys, sprockets, gears, propellers, large fans and other various connections, etc.; features: large torque, high precision, convenient and quick assembly and disassembly, simple operation, good positioning, reduced scrap rate of mated shafts and hubs, It is reusable and does not damage the mating surface, making it the most ideal and economical choice at present.

1. Installation: The bushing has been lubricated before leaving the factory and can be installed and used directly. During installation, first screw three bolts into the screw holes of the flange of the other part, evenly distributed along the circumference, and push open the inner sleeve and outer sleeve. Then put the expansion sleeve into the hub hole at the designed position, and use a force measuring wrench to tighten the bolts. The tightening method is to only tighten each bolt to 1/4 of the rated torque at a time. The tightening sequence is based on the opening. Tighten them symmetrically on the left and right in sequence to ensure that the rated torque value is reached.

2. Disassembly: When disassembling, loosen all the bolts several times. Then screw the bolt top expansion sleeve crosswise into the disassembled screw hole.

3. Protection: Prevent contamination of the expansion sleeve during installation. On machines operating in the open air or in poor working environments, anti-rust grease should be applied regularly to the exposed end faces of the expansion sleeves and bolts, and a type of expansion sleeve with better rust resistance should be selected. The expansion coupling sleeve is a new and advanced modern mechanical basic component. It is a new type of keyless coupling device that is widely used in the world today to connect machine parts and shafts. It relies on tightening 12.9-grade high-strength screws to create pressure and friction between the containment surfaces to achieve load transmission.