Tight bolts replace traditional hinge bolts and have been widely used in shipbuilding, steam turbine, hydropower and other industries. Tight bolts are divided into hydraulic tension and mechanical tension. Among them, hydraulic tight-fit bolts are mainly used in pure shear applications, and mechanical tight-fit bolts are mainly used in complex stress applications. Hydraulic over-tightening coupling bolt is a kind of bolt for hydraulic expansion and expansion assembly, which can produce stable rigid connection between large connection flanges. And greatly simplified the installation and removal process.
Compared with ordinary coupling bolts, the expansion of the over-tight coupling bolts through the tapered sleeve causes an interference fit between the coupling bolt and the flange hole (the amount of interference is controlled by hydraulic pressure, and the size of the hydraulic pressure is determined by accurate calculation) , So that the bolt can transmit torque by transmitting shear force; while ordinary bolts transmit torque by friction between the end face of the nut and the plane of the flange. In this way, torque and power are transmitted more directly and reliability is better. At the same time, the coupling bolts are super tightly fitted, and the installation and removal processes are all controlled by hydraulic pressure. The operation is reliable and accurate, and has a high reuse rate, so it has a stronger advantage.
Features of tight fitting bolts
1. Repeated use can save costs
Tightly matched bolts are combined bolts with oblique cone fit. After fitting, each mating surface can maintain the original surface roughness and can be used repeatedly.
2.Reduce the installation and removal time of bolts and nuts, and shorten the maintenance time
There is a 0.04-0.1mm gap between the tight-fitting bolt and the matching inner hole, which can be easily loaded and pushed out by hand.
3.Super shear resistance
After the bolt is tensioned, the bolt and the bolt hole are in an interference fit, which can withstand super shear resistance.
Tight fitting bolts replace traditional hinge bolts, changing the previous tedious matching grinding process.
5.It can be conveniently used for nut sinking occasions The tight-fitting bolt can be equipped with an extension rod with high-strength connection, which can freely extend the stretch section of the bolt, and the bolt can be easily removed after tensioning. Can be used for various nut sinking applications.