Marking device for measuring shrinkage rate of insulating paperboard

Abstract

The invention discloses a marking device for measuring the shrinkage rate of an insulating paperboard, which belongs to the technical field of production of insulating parts of transformers and comprises an extrusion part and a pair of stretching parts which are respectively mounted at two ends of the extrusion part. The extrusion part comprises a square block, blades, lugs, supporting strips, a lower boss and a handle, the square block is a main body structure of the whole scribing device, and the two ends of the square block are each provided with one blade. The four corners of the top of the square block are each provided with a lug inclining upwards, and a stretching part is installed between the two lugs of each end. The two ends of the top face of the square block are each provided with a lower boss, and springs are installed on the lower bosses. The stretching part comprises a cylinder, an upper connecting rod, an upper boss, a shifting fork, a pressing roller and a spring, the cylinder is installed between the two lugs at the end of the square block through a shaft pin, the upper connecting rod is obliquely connected to the upper portion of the cylinder, the downward upper boss is arranged in the middle of the upper connecting rod through a round rod, the spring is installed between the upper boss and the lower boss, the shifting fork is obliquely connected to the lower portion of the cylinder, and a pressing roller is installed between two supporting legs at the bottom of the shifting fork.

Description

technical field [0001] The invention belongs to the technical field of transformer insulating parts production, and in particular relates to a marking device for measuring the shrinkage rate of insulating cardboard. Background technique [0002] It is inevitable to use insulating parts in the manufacturing process of transformers. The application of insulating parts on transformers needs to go through a series of tests first. After passing the tests, they can be used on transformers. One of the series of tests is the shrinkage test. The test process is relatively simple. First, cut out several pieces of samples with a width of 25mm-50mm and a length of 170-175mm, and draw traces along the length direction at the two ends of the cardboard at a distance of 10-15mm from the edge and measure the size between the two traces. , and then put the sample in the drying oven to dry thoroughly, then measure the size between the two marks, and calculate the ratio of the size difference b...

AI Technical Summary

Problems solved by technology

The more cumbersome step in this test is to draw lines. The current common way of working is to use a knife to draw lines on the cardboard. The initial spacing of , which in turn leads to more cumbersome calculation of shrinkage

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