Dedicated stretching machine for link link pre-stretching to increase strength

Abstract

The invention relates to the technical field of connecting ring production, in particular to a special stretching machine tool for prestretching connecting rings to improve strength. Mine connecting rings are required to be prestretched one by one to improve the fatigue strength, and the traditional stretching machine has the disadvantages of difficulty in clamping, low production efficiency and high labor intensity. The stretching machine tool comprises a stretching hydraulic cylinder, a booster hydraulic cylinder, a lathe bed, a stretching mechanism, a workpiece clamping mechanism and the like. The left end of the stretching mechanism is connected with a piston rod of the stretching hydraulic cylinder fixed to the left end of the lathe bed; the right end of the stretching mechanism is fixed to the body of the stretching machine tool; a trapezoidal clamping groove in the middle of the stretching mechanism accommodates the workpiece clamping mechanism; by extending and retreating the piston rod of the stretching hydraulic cylinder, conversion of stations such as installation, initial loading, loading and detaching of the stretching mechanism is realized; in the loading process, a pressurization system is used for improving tensile force to reach the prestretching load specified by the connecting rings. The special stretching machine tool is suitable for high-efficiency, quick and safe prestretching of the massively produced connecting rings.

Description

technical field [0001] The invention relates to the technical field of production and manufacture of link links, in particular to a special stretching machine tool used for pre-stretching link links to improve strength. Background technique [0002] The connecting link is an independent part of the chain connection, and it is an indispensable and important independent part of coal mine special equipment such as scraper conveyors on the working face, transfer machines, and coal plows. Regardless of any chain traction equipment, the quality and performance level of the connecting link and the chain are also one of the main indicators for evaluating the reliability and life of the whole machine. The main quality performance of the connecting link is breaking strength and fatigue strength. Strength, in the manufacturing process, it needs to be pre-stretched piece by piece after heat treatment. Using a traditional stretching machine, it is necessary to use a connecting link to co...

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Problems solved by technology

Regardless of any chain traction equipment, the quality and performance level of the connecting link and the chain are also one of the main indicators for evaluating the reliability and life of the whole machine. The main quality performance of the connecting link is breaking strength and fatigue strength. Strength, in the manufacturing process, it needs to be pre-stretched piece by piece after heat treatment. Using a traditional stretching machine, it is necessary to use a connecting link to connect two chains with 3 rings into a whole chain, and install it on the stretching machine. Stretching, so clamping is very difficult, production efficiency is low, and labor intensity is high

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