CN203232007U - Ultrasonic flaw detection test block for willow hole fork-shaped leaf root with seam - Google Patents

Abstract

The utility model relates to a special ultrasonic flaw detection test block for a perforation rivet multifork root. The test block comprises a 20# steel test block, a left round hole, a right round hole, a first wire cutting slot, a second wire cutting slot, a third wire cutting slot and a fourth wire cutting slot, wherein the length, width and height of the 20# steel test block are 80mm, 60mm and 10mm respectively; the left round hole vertically penetrates through the surface of the test block, and the center is 25mm away from the left edge of the test block and 18mm away from the upper edge of the test block; the right round hole is symmetric to the axis of the left round hole test block; the first wire cutting slot and the second wire cutting slot are formed on the two sides from left to right on the horizontal center line of the left round hole; the third wire cutting slot and the fourth wire cutting slot are formed on the two sides from left to right on the horizontal center line of the right round hole; the length of the first, the second, the third and the fourth wire cutting slots is 0.5mm respectively; the diameter of the left round hole and the right round hole is (phi)16mm respectively; the widths of the first, the second, the third and the fourth wire cutting slots is 0.4mm, 0.6mm, 0.8mm and 1.0mm respectively. The utility model provides an ultrasonic test block suitable for field detection of a perforation rivet multifork root for the generating set of 200MW and below of a power system, the detection quality is guaranteed, and the potential safety hazard is eliminated for safe operation of a power plant.

Description

Ultrasonic flaw detection test block for willow hole fork-shaped leaf root with seam

technical field

The utility model belongs to the technical field of electric power equipment manufacturing and processing systems, in particular to a special ultrasonic flaw detection test block for a willow-hole fork type blade root riding on a seam.

Background technique

The blade is an important part of the steam turbine in the generator set. The fracture accident of the blade root often seriously threatens the safe operation of the steam turbine. Therefore, it is very important to carry out preventive inspection of the blade in time through various non-destructive testing methods, and it is also the main element of the metal supervision and inspection of the generator set. One of the testing items.

The accident-prone parts of the steam turbine blades of the current 200MW and below generator sets are the final stage and the second final stage, as shown in Figure 1, including impeller 1, blade root 2 and blade 3, and their roots are mainly fork-shaped willow holes. Blade root, as shown in Figure 2, is often damaged at the blade root, so inspectors must conduct flaw detection at detection point 4. However, due to the complicated conditions of on-site detection, a comparison test block must be used to ensure the accuracy of ultrasonic detection Spend.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art, and provide a special ultrasonic flaw detection test block for the willow-hole fork-shaped blade root.

The utility model solves its technical problem and realizes by taking the following technical solutions:

A special ultrasonic flaw detection test block for willow-hole fork-shaped blade root riding on a seam, which is characterized in that: the test block includes a No. 20 steel test block with a length × width × height of 80 mm × 60 mm × 10 mm, a vertical penetration test block surface, and a center distance of The left edge of the test block is 25mm, the left circular hole 18mm from the upper edge of the test block, the right circular hole symmetrical to the center axis of the left circular hole test block, and the first line drawn from left to right on the horizontal centerline of the left circular hole The cutting groove and the second line cutting groove, the third line cutting groove and the fourth line cutting groove made on the horizontal centerline of the right circular hole from left to right, the lengths of the first to fourth line cutting grooves are all 0.5 mm.

Moreover, the diameters of the left circular hole and the right circular hole are both φ16mm.

Moreover, the widths of the grooves cut by the first to fourth lines are respectively 0.4 mm, 0.6 mm, 0.8 mm, and 1.0 mm.

Advantage and positive effect of the present utility model are:

1. The utility model is aimed at generating sets of 200MW and below in the power system, and invents an ultrasonic test block suitable for on-site detection of willow-hole fork-shaped blade roots, which ensures the quality of the detection and eliminates potential safety hazards for the safe operation of the power plant.

2. The utility model has ingenious conception, simple structure and is convenient for application and popularization.

Description of drawings

Fig. 1 is a structural schematic diagram of a steam turbine blade of a current generating set;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a structural view of the utility model.

Detailed ways

The embodiments of the present utility model will be described in further detail below in conjunction with the accompanying drawings. The following embodiments are only descriptive, not restrictive, and cannot limit the protection scope of the present utility model.

A special ultrasonic flaw detection test block for willow-hole fork-shaped leaf root riding on the seam, as shown in Figure 3, the test block includes a No. 20 steel test block with a length × width × height of 80 mm × 60 mm × 10 mm 1. Vertically penetrate the surface of the test block , the center of the circle is 25mm from the left edge of the test block, and the left circular hole is 18mm from the upper edge of the test block. The first wire-cutting groove 2 and the second wire-cutting groove 4, the third wire-cutting groove 5 and the fourth wire-cutting groove 7 made on the horizontal center line of the right circular hole from left to right, the first to the second The lengths of the four-wire cutting grooves are all 0.5mm.

In the specific implementation of the utility model, the diameters of the left circular hole and the right circular hole are both φ16mm.

In the specific implementation of the present utility model, the widths of the grooves cut by the first to fourth lines are respectively 0.4 mm, 0.6 mm, 0.8 mm, and 1.0 mm.

application principle

When the probe is used to scan for defects at the root of the fork-shaped leaf with slotted willow holes, the signal of the scanning probe changes with the depth of the defect at the root of the forked leaf with slotted willow holes. When defects are found at the fork-shaped leaf root of the inspection seam, use the actual detection results of the scanning probe to compare with the special test block for detection, and cut according to the corresponding lines next to the left round hole and the right round hole of the simulated leaf root pin hole on the special test block The width of the groove can roughly determine the position and width of the actual detection defect.

Claims (3)

1. special-purpose UT (Ultrasonic Testing) test block of junction of the edges of two sheets of paper willow hole multifork root, it is characterized in that: this test block comprises that long * wide * height is No. 20 steel test blocks of 80mm * 60mm * 10mm, vertically penetrate the test block surface, distance of center circle test block left hand edge 25mm, left circular hole apart from test block coboundary 18mm, with axisymmetric right circular hole in the left circular hole test block, at the left circular hole horizontal center line first line cutting groove and the second line cutting groove made of both sides from left to right, at right circular hole horizontal center line the 3rd line cutting groove and the 4th line cutting groove made of both sides from left to right, the length of described first to fourth line cutting groove is 0.5mm.

2. the special-purpose UT (Ultrasonic Testing) test block of junction of the edges of two sheets of paper willow hole multifork root according to claim 1, it is characterized in that: the diameter of described left circular hole and right circular hole is φ 16mm.

3. the special-purpose UT (Ultrasonic Testing) test block of junction of the edges of two sheets of paper willow hole multifork root according to claim 1, it is characterized in that: described width by first to fourth line cutting groove is respectively 0.4mm, 0.6mm, 0.8mm, 1.0mm.

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