Hydraulic nut tightening principle

Ordinary thread locking is locked by rotating the wrench to generate torque. The main force is consumed to overcome the frictional resistance between threads. Especially for large-diameter threaded connections, the pre-tightening force cannot be reached at all due to the influence of manpower, tools and working space. To meet the design and installation requirements, the thread is easy to loosen in vibration situations.

　　Hydraulic nuts completely change the traditional screw fastening method, changing the traditional torque locking to axial tension locking. Even if the hydraulic nut is used with the power of the ultra-high pressure oil pump, the fastening bolt is axially elongated, close to the yield point of the material, and the thread is locked by the elasticity of the material itself.

　　 As a new type of powerful fastening element, hydraulic nut can be used in various occasions that require strong fastening and strong anti-loosening fastening to directly replace traditional nuts, especially when the narrow space cannot meet the wrench space and operating space The use of hydraulic nuts in occasions can better meet the tightening needs. In some occasions, using hydraulic nuts to directly replace traditional nuts can achieve the advantages of synchronous fastening of multiple sets of hydraulic nuts, realize synchronous fastening to obtain the same pre-tightening force, make installation and assembly work more accurate, and improve equipment performance. (Guide: Briefly describe the application and classification of high-strength bolts) 　　

In some occasions, hydraulic nuts cannot be used to directly replace existing nuts and to achieve strong tightening, hydraulic bolt tensioners can be used to achieve technical requirements that have the same functions and characteristics as hydraulic nuts.

　　The working principle of hydraulic bolt tensioner is the same as that of hydraulic nut. The bolt is stretched and elongated by hydraulic pressure, and then the nut is tightened and locked to achieve strong tightening. The use of hydraulic nut or hydraulic bolt tensioner can be precise Set the pre-tightening force with an accuracy of up to 3%. The hydraulic bolt tensioner with combined design can realize a set of tensioners suitable for the tensioning use of bolts of multiple specifications by changing different stretching heads, and has perfect versatility and replacement. The use of hydraulic bolt tensioners has the advantages of being simpler, safer, more accurate, more reliable, and faster, and brings higher efficiency to the assembly, installation, and maintenance of mechanical equipment.

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