Piston type high-pressure tensile hydraulic nut

Abstract

The invention discloses a piston type high-pressure tensile hydraulic nut. The inner ring of a tensile nut of the piston type high-pressure tensile hydraulic nut is arranged as a ladder shape. A roundring is protruded from a ladder-shaped shoulder part in the axial direction. The inner ring of the round ring is parallel to the axial direction. The outer ring of the round ring is a bevel. A hole channel connected with a high-pressure oil tube connecting opening is formed from the outer surface of the tensile nut to the ladder-shaped shoulder part. The bottom of the outer ring of the tensile nut is provided with a thread. A locking nut is screwed at a thread at the bottom of the tensile nut. One end of a piston is provided with an annular groove, wherein the shape of the annular groove is matched with the round ring of the tensile nut. The piston is located in the tensile nut. The round ring is coincident with the groove. Annular sealing pieces are correspondingly arranged between the outer ring of the piston and the inner ring of the tensile nut as well as between the parallel-coaxially contacting surfaces of the round ring and the groove. A nut gasket is arranged at the bottom ofthe tensile nut. A Haff cushion block is arranged on the outer ring of the piston in a sleeving mode and is located between the tensile nut and the nut gasket. According to the piston type high-pressure tensile hydraulic nut, the pre-tightening requirement for the large bolt in the installation process of mechanical equipment can be met, meanwhile, use of lots of tools is avoided, and disassemblyof the bolt is facilitated.

Description

technical field [0001] The invention relates to a piston type high pressure stretching hydraulic nut. Background technique [0002] During the installation of mechanical equipment, it is often necessary to use large-sized bolts and nuts for the fixation of some large-scale equipment to ensure that the components have high connection and fixation strength. Such as: the face of the gearbox, the connecting bolts of the bearing seat, the anchors of various equipment and the fixed connecting bolts of some large parts. The key point of this kind of bolt and nut installation is mainly the control of its pretightening force. [0003] At present, the commonly used bolt fastening methods mainly include the following categories: [0004] 1. Torque method: Use hydraulic wrench and other tools to tighten the bolts according to the given torque to obtain the necessary pre-tightening force; [0005] 2. Nut angle method: When the nut is tightly attached to the connected part, the nut is ...

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Problems solved by technology

And in the implementation process of these several kinds of methods, all need to use a large amount of special tools and utensils, as: hydraulic wrench, puller, electric heating rod, high-pressure oil pump etc.; The removal of the bolts also becomes quite difficult

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