A hydraulic tensioner

Abstract

The invention discloses a hydraulic stretching device which comprises a hydraulic cylinder and a stretching nut. The cross section of a cylinder body of the hydraulic cylinder is annular, a cavity for one end of a bolt to be stretched to penetrate is defined by the cylinder body of the hydraulic cylinder, and the end face of a piston of the hydraulic cylinder forms an ejecting face. The stretching nut is composed of a first nut sleeve buckle and a second nut sleeve buckle. When the first nut sleeve buckle and the second nut sleeve buckle are locked together, an inner thread of the first nut sleeve buckle and an inner thread of the second nut sleeve buckle form an inner thread matched with an outer thread of the bolt together, and the end face, close to the hydraulic cylinder, of the stretching nut, is provided with a stress face matched with the ejecting face so that the stretching nut can move under the ejecting of the piston in the direction parallel to the axial direction of the hydraulic cylinder. The hydraulic stretching device achieves the technical purpose that the defects that the connection operation of a stretching nut of an existing hydraulic stretching device and a bolt to be stretched is complex and consumes much time are overcome, and the hydraulic stretching device is easy and convenient to use and capable of achieving quick connection of the stretching nut and the bolt.

Description

technical field [0001] The invention relates to the field of mechanical assembly. Specifically, it is a hydraulic tensioner. Background technique [0002] Bolts and nuts are indispensable parts for assembly in the mechanical field. The fixing method of bolts and nuts is stronger and more reliable than other fixing methods, so it has become the most commonly used method for fixing two or more parts together. Since the bolts used in some large-scale equipment are relatively thick, the pre-tightening force is very large, if the fastening and dismounting of the bolts are done manually, the labor intensity is very high. In addition, because the connection between components requires several, dozens or even dozens of bolts, manual tightening and dismounting of the bolts in sequence will cause uneven stress distribution at each connection position, thereby affecting the strength of the connection. [0003] At present, the bolts are mostly stretched by hydraulic tensioners. The hy...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the disadvantages of complex and time-consuming operation of connecting the stretching nut and the bolt to be stretched in the existing hydraulic tensioner, and provide a hydraulic tensioner that is simple and can quickly connect the stretching nut and the bolt. Stretcher

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