Hydraulic nut working principle and characteristics
The structure of the hydraulic nut is divided according to different uses: thick and thin type, high pressure and ultra high pressure, top ring locking and bottom ring locking. The hydraulic nut is mainly composed of a cylinder, a piston and a lock ring, and the oil inlet has an overhead and side entry design. Here we introduce the working principle of the hydraulic nut together.
Hydraulic nut working principle
The hydraulic cylinder is located at the axial center of the bolt and is used to axially stretch the bolt to achieve the required amount of tension for the bolt. And it is this amount of tension of the bolt that determines the clamping force required for bolt tightening. When the hydraulic nut is pressurized, the bolt is stretched while the hydraulic nut and the joint face are in close contact. This locks the axial deformation of the bolt, ie the remaining bolt load is locked in the nut. There are gaskets between many connecting surfaces. The seal only works when the connecting surface is pressed, so that it is particularly important that the connecting surface remains clamped. The load applied to the bolt is proportional to the hydraulic pressure in the hydraulic cylinder. This design can hold the payload very accurately. Since the load is directly applied to the bolt and all the force is applied to the bolt elongation, the space required for the load generation can be minimized.
Hydraulic nut features
1. Due to the ultra-high pressure hydraulic system, the size of the hydraulic bolt is matched with the original traditional nut, no need to modify the original bolt design
2. Spaces for wrenches and sleeves are not required, and the size of the bolt pair is more compact;
3. Screw work and pure tension state, the same size screw can provide 20% -30% more contribution contribution, bolts more secure;
4. By hydraulically stretching the bolt, the predetermined load is more accurate and the fastening is more reliable;
5. Adopting the world's most advanced integrated sealing structure of polyurethane/metal composite seal, there are few sealing parts, and the sealing form takes into account the low pressure, high pressure and ultra-high pressure sealing, which is especially suitable for work under ultra-high pressure;
6. The cylinder has good rigidity, stable and reliable operation, and easy operation;
7. When the piston is over-stroked, the system will automatically relieve the pressure. The operator's mistakes can be effectively corrected by the system. 8. All the bolts can be tightened at the same time to greatly improve the assembly efficiency and the flange pressing force is the most uniform.
The above is the introduction of the relevant knowledge of the working principle and characteristics of the hydraulic nut by Xiaobian. I hope to help everyone, and I would like to know more about the relevant knowledge.
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