In the use of high-strength nuts, the strength level after heat treatment is 10, and it is used in conjunction with 10.9-level anchor bolts. The bearing capacity of ordinary nuts and high-strength nuts is completely different from that of benzoic acid. Generally, the anchor bolts immediately bear the external load, but the bearing capacity of the high-strength nut is based on the internal increased pre-tension force P, and the friction formed on the contact area of the connected parts to bear the external load. The connection of the high-toughness nut is very simple, the bearing capacity is very good, it can be disassembled, it is resistant to fatigue, and it can not be loosened under the effect of freezing load; it is a connection method with great development potential. The basic principle of bolt connection is to tighten the nut with a special wrench, so that the anchor bolts are manipulated and have a large pre-tension force. Through the spacer and the nut, the same pre-tension is also formed on the connected parts. work pressure. Xuzhou Xinxing Dacromet will form a lot of friction along the surface to be connected under the effect of preparation pressure. Pharmaceutical industry loads are smaller than friction, so components are less likely to cause rolling movement and connections are less likely to be damaged. Its connection relies on the friction force between the contact areas of the connecting parts to move the mechanism to each other. The clamping force of the lifting member and the friction coefficient of the enlarged member contact area make the contact surface have sufficient friction force. Add pre-tensioning force to anchor bolts to generate clamping force between components. The index of friction is particularly harmful to the bearing capacity of the connecting bolts. In order to increase the friction coefficient of the contact area, the friction coefficient is mainly affected by the materials of the components and forms of the contact area. Therefore, steel brush cleaning and sandblasting are often used to clean the contact area of components in the connection range during decoration construction.