Scanning device for field detection of annular weld joint of GIS shell

Abstract

The invention discloses a scanning device for field detection of an annular weld joint of a GIS shell. The scanning device comprises a limiting guide rail, a chain type scanning frame, an length adjusting screw and a scanning trolley; the chain type scanning frame comprises a plurality of wide chain links, a plurality of connecting pins, a plurality of narrow chain links, a plurality of rollers, atail end chain link and a trolley connecting chain link, wherein the adjacent chain links are connected through the connecting pins, and each connecting pin is provided with one corresponding rollerused for being in contact with the GIS shell; the chain type scanning frame is enclosed into a circle and is used for being fixed on one side of the annular weld joint of the GIS shell, and the lengthadjusting screw is installed on the tail end chain link; and the scanning trolley is installed on the trolley connecting chain link. According to the scanning device, the chain type scanning frame with the adjustable length is adopted, and annular weld joint detection of the GIS shells with different diameters is met; and the scanning trolley is limited through the limiting guide rail, so that high contact between a probe and the workpiece surfaces on the two sides of the weld joint is ensured, and the accuracy of the detection result is improved.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing of GIS shells, in particular to an ultrasonic phased array scanning device for on-site detection of circular weld seams of GIS shells. Background technique [0002] The gas-insulated fully enclosed combined electrical equipment (GIS) in the power grid equipment is a complete set of devices composed of circuit breakers, disconnectors, grounding switches, busbars and other high-voltage electrical appliances. These equipment or components are all enclosed in metal tanks. And fill it with SF with a certain pressure (generally greater than 0.3MPa) 6 The gas acts as an insulating and arc extinguishing medium. Among them, the tank body used by GIS is a pressure-bearing part, requiring SF 6 The annual air leakage rate is less than 1%. Once SF occurs due to GIS tank damage 6 Leakage not only affects the reliable operation of GIS and even the power system, but also pollutes the surroundi...

AI Technical Summary

Problems solved by technology

[0005] 1. The surface of the workpiece on both sides of the probe and the weld cannot be in good contact, and the coupling is poor;

[0006] 2. When adjusting the position of the probe, it is necessary to dismantle the probe and reposition it;

[0007] 3. It is difficult to detect the girth weld of GIS shells with different diameters

[0008] 4. Unable to meet the multiple repeatability of circular seam detection

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