Working principle and characteristics of hydraulic

2022-07-22
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Hydraulic nut is an advanced bolt assembly method, which is especially suitable for mechanical fastening in narrow space and heavy load vibration. The working principle of hydraulic nut is to use hydraulic oil cylinder to directly apply external force to the bolt, so that the bolt to which the force is applied is stretched in its elastic deformation zone. After the bolt is stretched, screw the lock ring on the hydraulic nut, so that the bolt will be locked in the stretched position by the lock ring

the structure of hydraulic nuts can be divided into thick and thin types, high pressure and ultra-high pressure, top ring locking and bottom ring locking according to different uses. The hydraulic nut is mainly composed of oil cylinder, piston and lock ring, and the oil connection port is designed with top and side entry. Now let's introduce the working principle of hydraulic nut

working principle of hydraulic nut

the hydraulic cylinder is located at the central axis of the bolt and is used to stretch the bolt axially to achieve the required stretching amount of the bolt. It is this tension of the bolt that determines the clamping force required for bolt tightening. When the hydraulic nut is pressurized, the bolt is stretched, and the hydraulic nut is close to the joint surface. Thus, the axial deformation of the bolt is locked, that is, the remaining bolt load is locked in the nut. Many connecting surfaces are equipped with gaskets. The sealing gasket only works when the connecting surface is compressed, so it is particularly important that the connecting surface is always clamped. The load applied to the bolt is proportional to the oil pressure in the hydraulic cylinder, so this design can retain the payload very accurately. Since the load is directly applied to the bolt and all forces are used for bolt elongation, the space required for load generation can be minimized

hydraulic nut features

1 Due to the ultra-high pressure hydraulic system, the size of the hydraulic bolt matches the original traditional nut, and there is no need to modify the original bolt pair design

2 There is no space for spanner and socket, and the size of bolt pair is more compact

3. The screw works in the pure tension state. The screw with the same size can provide more output contribution of 20%-30%, and the bolt pair is safer

4. By hydraulically stretching the bolt, the predetermined load is more accurate and the fastening is more reliable

5. It adopts the most advanced polyurethane/metal composite sealing overall sealing structure in the world at present, with few sealing parts, and the sealing form takes into account low-pressure, high-pressure and ultra-high-pressure sealing, which is especially suitable for working under ultra-high pressure

6. The oil cylinder has good running rigidity, stable and reliable operation, and simple operation

7. When the piston overstroke, the system automatically relieves pressure, and the operator's error can be effectively corrected by the system; 8. All bolts can be tightened at the same time to greatly improve the assembly efficiency, and the compression force of the flange is the most uniform

the above is the Xiaobian's introduction to the working principle and characteristics of hydraulic nuts. I hope it will be helpful to you. If you want to know more relevant knowledge, you can go to Qijia information

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