Scribe for Thermoplastic Pipe Inspection

Abstract

The invention discloses a line marker for test of thermoplastic plastics pipes. The line marker comprises a round base, a rotating disc, a connecting rod, an upright column and two line marking pen clamps. A bearing is arranged in the top cylinder of the round base, the rotating disc is mounted on the bearing, sliding chutes are formed on the rotating disc and extend in two directions perpendicular to the diameter of the rotating disc, sliding clamp sheets are arranged inside the sliding chutes and used for positioning and clamping the pipes, the round base is connected with the upright column through the connecting rod, the connecting rod comprises a small upright column, two sliders are arranged above and below the upright column, the upright column passes through the vertical plane of each slider, the line marking pen clamps pass through the horizontal plane of each slider, each line marking pen clamp comprises a link rod and a pen clamp, and a telescopic device is welded at one end of each link rod to connect the pen clamps. The line marker has the advantages of simple structure, convenience in use, high line-marking precision and high line-marking efficiency; and ensures the fastness and accuracy of longitudinal shrinkage test and external shock resistance of thermoplastic plastics pipes.

Description

technical field [0001] The invention relates to a scriber, in particular to a scriber for testing thermoplastic pipes. Background technique [0002] When conducting longitudinal shrinkage and external impact resistance tests of thermoplastic pipes, it is necessary to draw fixed-distance, smooth and continuous circumferential lines or evenly divided tangent lines on thermoplastic pipes with regular shapes and smooth surfaces. The longitudinal retraction rate test GB / T6671-2001 stipulates that a scribe should be used to mark the line. However, there is no special liner for longitudinal retraction test of plastic pipes on the market at present, so most testing institutions usually use marker pens and vernier calipers to complete it by hand. The above method will happen in actual use as follows: During the sample preparation, the pipe is difficult to fix, resulting in defects such as insufficient closure of the circumferential lines and unequal spacing between two parallel circ...

AI Technical Summary

Problems solved by technology

Overcome the shortcomings of the existing freehand marking methods such as uneven marking, incoherent marking, and inaccurate spacing

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