CN213957614U

CN213957614U - Curved surface step test block for ultrasonic thickness measurement of small-diameter pipe

Info

Publication number: CN213957614U
Application number: CN202022012891.6U
Authority: CN
Inventors: 闫欣博; 于宝虹
Original assignee: Shanghai Jinyi Inspection Technology Co ltd
Current assignee: Shanghai Jinyi Inspection Technology Co ltd
Priority date: 2020-09-15
Filing date: 2020-09-15
Publication date: 2021-08-13
Anticipated expiration: 2030-09-15

Abstract

The utility model discloses a curved surface ladder test block for path pipe supersound thickness measurement, this curved surface ladder test block include that the cross-section is curved base member, the base member outer lane is equipped with a plurality of steps of arc external diameter from little to big along length direction in proper order, the arc internal diameter of a plurality of steps is unanimous, the arc external diameter is arranged from little to big and is formed the ladder curved surface. The test block is simple in structure, convenient to manufacture, convenient to carry on site and carry out calibration operation, not only can calibrate the sound velocity of the pipe wall, but also can calibrate the size of a detection blind area, and improves the detection precision and detection effect of the wall thickness of the small-diameter pipe.

Description

Curved surface step test block for ultrasonic thickness measurement of small-diameter pipe

Technical Field

The utility model relates to a nondestructive test technical field especially relates to a curved surface ladder test block that is used for path pipe supersound thickness measurement.

Background

In ultrasonic thickness measurement detection, the accuracy of material sound velocity verification determines the accuracy of thickness measurement data. At present, ultrasonic thickness gauges of various manufacturers and brands are available on the market, the ultrasonic thickness gauge is small in size, simple and convenient to operate, capable of automatically reading thickness measurement values and very convenient to use. However, the sound velocity calibration test blocks of the ultrasonic thickness gauge are all planar, the thickness measurement step test block given in the ultrasonic detection standard is also a planar step test block, a curved surface step test block which is used for sound velocity calibration and is consistent with a tubular shape in ultrasonic thickness measurement of a small-diameter tube is not provided, the coupling stability of the small-diameter tube in ultrasonic thickness measurement is poor, the ultrasonic thickness measurement has particularity for placement of an ultrasonic probe and acquisition of data, and in order to achieve a high-precision detection result, a small-curvature tubular test block matched with the small-diameter tube is required to be used for improving sound velocity calibration precision.

Disclosure of Invention

The utility model aims to solve the technical problem that a curved surface ladder test block for path pipe supersound thickness measurement is provided, this test block simple structure, the preparation is convenient, and portable and check-up operation not only can calibrate the pipe wall sound velocity, can also check-up detection blind area to cooperation bicrystal and curved surface probe improve path pipe wall thickness detection precision.

For solving the technical problem, the utility model is used for curved surface ladder test block of path pipe supersound thickness measurement includes that the cross-section is curved base member, the base member outer lane is equipped with a plurality of steps of arc external diameter from small to big along length direction in proper order, the arc internal diameter of a plurality of steps is unanimous, the arc external diameter is arranged from small to big and is formed the ladder curved surface.

Further, the arc of the base body cross section is semicircular.

Further, the length of the steps is larger than the diameter of the ultrasonic thickness measuring probe.

Further, the wall thickness of the plurality of steps is set to be 1mm in the difference between the wall thicknesses of the adjacent steps.

Because the utility model is used for curved surface ladder test block of path pipe supersound thickness measurement has adopted above-mentioned technical scheme, this curved surface ladder test block includes that the cross-section is curved base member promptly, the base member outer lane is equipped with a plurality of steps of arc external diameter from little to big along length direction in proper order, the arc internal diameter of a plurality of steps is unanimous, the arc external diameter is arranged from little to big and is formed the ladder curved surface. This test block simple structure, the preparation is convenient, and portable and check-up operation in the scene of being convenient for detects when the path pipe with the test block with the material, not only can be through the step face calibration pipe wall sound velocity of the known thickness of test block, can also through whether the clear display of different wall thickness step position inner wall echo comes the surface detection blind area size of check-up probe, verify whether the selected probe is applicable to path pipe wall thickness and detect, ensure path pipe wall thickness detection precision and detection effect.

Drawings

The invention will be described in further detail with reference to the following drawings and embodiments:

FIG. 1 is a schematic structural view of a curved stepped test block for ultrasonic thickness measurement of a small-diameter pipe according to the present invention;

FIG. 2 is a schematic cross-sectional view of the present curved-surface stepped test block.

Detailed Description

Embodiment is shown in fig. 1 and 2, the utility model discloses a curved surface ladder test block for path pipe supersound thickness measurement includes that the cross-section is

curved base member

1, 1 outer lane of base member is equipped with a plurality of steps 11 of arc external diameter from small to big in proper order along length L direction, the arc internal diameter R of a plurality of steps 11 is unanimous, arc external diameter R is arranged from small to big and is formed the ladder curved surface.

Preferably, the arc shape of the base body cross section is a semicircle.

Preferably, the length of the plurality of steps 11 is greater than the diameter of the ultrasonic thickness measuring probe. To facilitate stability of probe placement and good contact coupling.

Preferably, the wall thickness of the plurality of steps 11 is set to have a difference of 1mm between the wall thicknesses of the adjacent steps.

The curved surface stepped test block can be made of a small-diameter metal seamless tube, and the material of the test block is selected according to the quality of a detected tube. Cutting a section of seamless pipe with the inner diameter r and the length L from the central axis, and then processing the section of seamless pipe into a step curved surface on the outer ring; or after the stepped curved surfaces of all sections of the seamless pipe are processed, the stepped curved surfaces can be symmetrically split from the central axis; and the wall thickness of the pipe wall of the stepped curved surface is processed into the wall thickness difference of the pipe wall of the adjacent stepped curved surfaces which is 1 mm.

When the small-diameter tube with the same material as the test block and the similar curvature is actually detected, a step curved surface close to the small-diameter tube is selected, the probe to be used is well coupled with the step curved surface, sound velocity calibration is carried out, and then the calibrated instrument-probe combined system is used for carrying out field detection. If the detection blind area of the probe needs to be verified, the probe is sequentially placed on the stepped curved surfaces with different thicknesses from the thicker stepped curved surface, the echo condition of each test position is observed under the condition that the probe is well coupled with the curved surfaces, and the wall thickness value of the first stepped curved surface which cannot clearly display the inner wall echo is the detection blind area of the probe.

Claims

1. The utility model provides a curved surface ladder test block that is used for path pipe supersound thickness measurement which characterized in that: the outer ring of the base body is sequentially provided with a plurality of steps with arc outer diameters from small to large along the length direction, and the arc inner diameters of the steps are consistent and the arc outer diameters are arranged from small to large to form a step curved surface.

2. The curved stepped test block for ultrasonic thickness measurement of small-diameter pipes according to claim 1, wherein: the arc of the base body cross section is semicircular.

3. The curved stepped test block for ultrasonic thickness measurement of small-diameter pipes according to claim 1 or 2, wherein: the length of the steps is larger than the diameter of the ultrasonic thickness measuring probe.

4. The curved stepped test block for ultrasonic thickness measurement of small-diameter pipes according to claim 3, wherein: the wall thickness of the steps is set to be 1mm, and the difference between the wall thicknesses of the adjacent steps is set to be smaller than that of the adjacent steps.