Wrench with self-locking function

Abstract

The invention provides a wrench with a self-locking function; the wrench comprises a wrench body; a fixed end is integrally formed in the front end of the wrench body; the wrench body has a storage tank; a movable end that moves along the fixed end direction and a hydraulic locking device that controls the movable end to move are arranged in the storage tank; a self-locking device that locks the movable end is also arranged in the storage tank, and comprises a positioning transmission bar with the front end fixedly connected with the movable end and a positioning compact mechanism arranged onthe rear end of the positioning transmission bar. The wrench is high in work efficiency, simple in operation, can solve the mechanical wearing formed by engagement between a worm of a conventional movable wrench and a toothed bar on the movable end, has the hydraulic self-locking function, and is safe and reliable.

Description

technical field [0001] The invention relates to the technical field of hand tools, in particular to a wrench with a self-locking function. Background technique [0002] A wrench is well known as a commonly used hand-held loading and unloading tool, which is widely used in daily life and in the fields of industry and machinery manufacturing; a general adjustable wrench includes a fixed end integrally formed with the wrench main body, and a fixed end that slides relative to the fixed end. The installed movable end adjusts the distance between the two jaws through a worm meshing with a rack formed on the movable end. The adjustment of this wrench is cumbersome and requires more time to adjust, and the looseness or gap between the worm and the movable end is unavoidable, so that the adjustable wrench can seldom adjust the various positions of the nut in the way of a fixed wrench. The surface is effectively combined, and in the process of use, because the movable end is not comp...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the following problems in the prior art, the existing wrench realizes the automatic hydraulic locking of the fixed end and the movable end, but when the hydraulic automatic locking device does not lock the movable end in the working state, it is easy to cause improper operation and make the The hydraulic cylinder is vacuumed, which affects the normal use of the wrench; the invention provides a wrench with self-locking function, including a wrench body, the front end of the wrench body has an integrally formed fixed end, and the wrench body is provided with a receiving groove , the accommodating groove is provided with a movable end that can move along the direction of the fixed end and a hydraulic locking device that controls the movement of the movable end. It is characterized in that: the hydraulic locking device includes front and rear hydraulic cylinders, The cut-off valve between them and the push rod connected with the movable end and the front hydraulic cylinder at both ends respectively; the self-locking device for locking the movement of the movable end is also provided in the accommodating groove, and the self-locking device includes a fixed connection between the front end and the movable end The positioning bar and the pressing mechanism at the rear end of the positioning bar

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