CN107884265B - Richter clamping device for detecting hardness of pipeline - Google Patents

Abstract

The invention discloses a clamping device of a Lee hardness tester for detecting the hardness of a pipeline, which mainly comprises a pipeline clamping and fixing part, the Lee hardness tester fixing part and a track block axially sliding along the pipeline. The device can firmly fix the Richter hardness tester on the measured pipeline, well support the pipeline, prevent relative displacement or bounce from influencing measurement accuracy during measurement, and can strictly move the Richter hardness tester along the axial direction of the measured pipeline by virtue of the sliding rail, so that research and analysis are facilitated. The device can effectively improve the measurement accuracy of the Richter hardness tester.

Description

A Leeb hardness tester clamping device for pipe hardness testing

Technical field

The invention relates to the field of Leeb hardness measurement on the outer surface of pipelines, and in particular to a Leeb hardness meter clamping device for pipeline hardness detection.

Background technique

Nowadays, the single unit capacity of thermal power plants continues to increase. The main steam pressure of ultra-supercritical units reaches more than 26MPa and the temperature exceeds 570°C. Therefore, higher requirements are placed on the material properties of various parts of the generating unit. During the infrastructure construction and service of thermal power plants, it is particularly important to conduct physical and chemical inspections on the quality of pipelines. Due to limited conditions, the testing methods are mainly hardness testing, supplemented by metallographic testing. Due to the limitations of portable Brinell hardness testers, on-site hardness testing mainly uses Leeb hardness testing.

Leeb hardness is a dynamic load test method. Its principle is to eject a tungsten carbide steel ball of a certain mass and diameter by loading a spring and impact the surface of the workpiece. The rebound speed and impact speed of the ball at a distance of 1mm from the pattern are measured by a point sensor. The ratio represents the level of hardness. The experimental force of Leeb hardness testing is small and the indentation is small, so it can be used to measure the hardness of small areas. For example, the hardness trend of the heat-affected zone in the welded joint, the hardness detection of the decarburization layer on the steel surface, etc.

The main factors affecting the accuracy of Leeb hardness measurement are: the specimen is displaced or bounced during measurement, thus consuming the elastic potential energy stored in the specimen during the impact process. In particular, the specimen mass is too small and the overall rigidity is poor. When measuring; if the wall thickness of the pipe specimen being measured is too small, the pipe diameter is too large, and the local rigidity is poor, overall elastic deformation may occur on the cross section, which will also lead to low measurement results; the operating techniques of the inspection personnel will also affect The final test results have an uncertain impact. Eliminating or reducing the influence of the above factors will significantly improve the accuracy of Leeb hardness testing.

Contents of the invention

The object of the present invention is to provide a Leeb hardness tester clamping device for pipeline hardness testing. The device consists of three parts: a pipeline clamping fixed part, a Leeb hardness tester fixed part and a hardness tester sliding track along the axial direction of the pipeline, wherein Taking the pipe clamping fixed part as the main body, the pipe clamping part can be adjusted through the screw rod to clamp pipes of different diameters. The Leeb hardness tester can be fixed on the device through the base. The Leeb hardness tester can be moved along the axis of the tested pipe. Moving in the direction and obtaining the displacement of the hardness tester through the reading ruler can facilitate the measurement of the hardness distribution trend in the heat-affected zone of welded joints.

In order to achieve the above objects, the technical solutions provided by the present invention are:

A Leeb hardness tester clamping device for pipe hardness testing, including a pipe clamping fixed part, a Leeb hardness tester fixed base and a hardness tester sliding track block along the axial direction of the pipe;

The pipe clamping and fixing part includes a clamp body, a fixed baffle on the lower side, a screw rod passing through the fixed baffle and a fixed V-shaped jaw on the upper side. The outer end of the screw rod is a clamping wheel, and the inner end of the screw rod is a clamping wheel. It is a movable clamping block, and the position of the movable clamping block is adjusted by rotating the clamping wheel to tightly clamp the pipe;

The fixed base of the Leeb hardness tester is tubular, and a gasket is provided at the bottom. The hole diameter of the gasket is larger than the outer diameter of the conduit thread of the impact body at the bottom of the Leeb hardness tester. The support ring of the Leeb hardness tester matches the Leeb hardness tester to support the Leeb hardness tester. The hardness meter is fixed on the gasket; the gasket is connected with a spring, and the gasket can move up and down and presses the lower end of the Leeb hardness meter against the surface of the pipe to be measured through the spring; the Leeb hardness meter is fixed outside the base The surface has threads and can be fastened to the track block where the hardness tester slides axially along the pipe;

The Leeb hardness tester slides along the axial direction of the pipeline track block and includes a reading scale, a displacement knob and a moving chuck.

Furthermore, the fixed V-shaped jaw has a concave angle of 150°, which can prevent the pipeline from moving laterally. At the same time, there is a hole inside the V-shaped jaw, which can be connected to the fixed base of the Leeb hardness tester.

Furthermore, the fixed base of the Leeb hardness tester, the movable chuck and the reading ruler are integrated and can move along the axial direction of the pipeline along with the movable chuck.

Furthermore, the movable chuck is connected to the fixed V-shaped jaw through a dovetail groove, and the shift knob can be rotated to control the movement of the movable chuck through an internal screw rod.

Compared with the prior art, the beneficial effects of the present invention are:

The clamping device of the present invention can completely eliminate the relative displacement or beating of the pipe and the Leeb hardness meter during measurement after clamping the hollow pipe and then fixing the Leeb hardness meter. After the clamping device tightens the pipe, the clamping device weighing more than 5 kg is connected to the pipe as a whole, which provides good support and increases the rigidity of the pipe under test. Therefore, this device can effectively improve the measurement accuracy of Leeb hardness. The spring inside the fixed base of the Leeb hardness tester presses the hardness tester against the surface of the pipe, which ensures that the impact head is vertically incident on the surface of the specimen, preventing problems such as non-adherence and non-verticality caused by manual operation; and it can make the Leeb hardness tester properly expansion and contraction to adapt to the unevenness of the pipe surface; and the displacement of the Leeb hardness tester can be accurately controlled by relying on the reading scale, while ensuring that the hardness measurement points are in the same axis direction.

Description of the drawings

Figure 1 is a front view of the clamping device of the present invention.

Figure 2 is a left side view of the clamping device of the present invention.

Figure 3 is a schematic assembly diagram of the hardness tester fixed base and Leeb hardness tester of the clamping device of the present invention.

In the picture: 1-Leeb hardness tester, 2-reading ruler, 3-shift knob, 4-pipe fitting to be tested, 5-moving chuck, 6-plier body, 7-fixed baffle, 8-clamping wheel , 9-screw, 10-movable clamping block, 11-fixed V-shaped jaw, 12-hardness tester fixed base, 13-spring, 14-gasket, 15-Leeb hardness tester bottom support ring.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments.

A Leeb hardness tester clamping device for pipe hardness testing, including a pipe clamping fixed part, a Leeb hardness tester fixed base and a hardness tester sliding track block along the axial direction of the pipe;

The pipe clamping and fixing part includes a clamp body 6, a fixed baffle 7 on the lower side, a screw rod 9 passing through the fixed baffle 7, and a fixed V-shaped jaw 11 on the upper side. The outer end of the screw rod 9 is a clamp. The inner end of the tightening wheel 8 is a movable clamping block 10. The position of the movable clamping block 10 is adjusted by rotating the clamping wheel 8, thereby tightly clamping the pipe;

The Leeb hardness tester fixed base 12 is tubular, with a gasket 14 at the bottom. The hole diameter of the gasket 14 is larger than the outer diameter of the conduit thread of the impact body at the bottom of the Leeb hardness tester, and matches the support ring of the Leeb hardness tester. 15. Fix the Leeb hardness tester on the gasket; the gasket 14 is connected with a spring 13. The gasket 14 can move up and down and presses the lower end of the Leeb hardness tester against the surface of the pipe to be tested through the spring 13; so The outer surface of the Leeb hardness meter fixed base 12 has threads and can be fastened to the hardness meter sliding track block along the axial direction of the pipe;

The Leeb hardness tester slides along the axial direction of the pipeline track block and includes a reading ruler 2, a displacement knob 3 and a moving chuck 5.

The fixed V-shaped jaw 11 has a concave angle of 150°, and there is a hole inside the V-shaped jaw 11, which can be connected with the Leeb hardness tester fixed base 12.

The Leeb hardness tester fixed base 12 is integrated with the movable chuck 5 and the reading ruler 2 and can move along the axial direction of the pipeline along with the movable chuck 5 .

The movable chuck 5 is connected to the fixed V-shaped jaw 11 through a dovetail groove. The shift knob 3 can be rotated to control the movement of the movable chuck 5 through an internal screw rod.

Let's enumerate a specific size of the device. The length of the clamp body of the device is 18cm, and the thickness of the movable clamping block is 1cm. The concave angle of the fixed V-shaped jaw is 150°. This clamping device can measure the surface hardness of pipes with an outer diameter of no more than 17cm. The maximum displacement of the mobile chuck is 20cm, and the specific displacement value can be obtained through the reading ruler.

When using, fasten the pipe and the Leeb hardness tester. At this time, you can press the measurement button of the Leeb hardness tester to measure. After completing the measurement of a point, rotate the displacement knob and determine the next measurement point according to the reading scale. The measurement can be repeated repeatedly to measure the Leeb hardness of multiple points in the same axis direction.

This clamping device can effectively overcome the relative displacement or beating of the pipe under test and the Leeb hardness tester, can adapt to the uneven surface of the pipe weld area, can improve the rigidity of the test piece, and can effectively improve the accuracy of Leeb hardness measurement. .

The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any skilled person familiar with the art may, without departing from the scope of the technical solution of the present invention and based on the technical essence of the present invention, Any simple modifications, equivalent substitutions, improvements, etc. made to the above embodiments still fall within the protection scope of the technical solution of the present invention.

Claims (1)

1. The utility model provides a pipeline hardness detects with brinell hardness tester clamping device which characterized in that: the device comprises a pipeline clamping and fixing part, a Lev hardness tester fixing base and a track block for axially sliding the hardness tester along the pipeline;

the pipeline clamping and fixing part comprises a clamp body (6), a fixed baffle (7) at the lower side, a screw rod (9) penetrating through the fixed baffle (7) and a fixed V-shaped jaw (11) at the upper side, wherein the outer end of the screw rod (9) is provided with a clamping rotary wheel (8), the inner end of the screw rod is provided with a movable clamping block (10), and the position of the movable clamping block (10) is adjusted by rotating the clamping rotary wheel (8), so that a pipeline is tightly clamped;

the fixed base (12) of the Lev's hardness tester is tubular, a gasket (14) is arranged at the bottom of the fixed base, the diameter of a hole of the gasket (14) is larger than the outer diameter of a pipe thread of an impact body at the bottom of the Lev's hardness tester, and the fixed base is matched with a supporting ring (15) of the Lev's hardness tester to fix the Lev's hardness tester on the gasket; the gasket (14) is connected with a spring (13), and the gasket (14) can move up and down and enables the lower end of the Rev hardness tester to be pressed on the surface of the detected pipeline through the spring (13); the external surface of the fixed base (12) of the Reed hardness tester is provided with threads, and the fixed base can be fastened on a track block of the hardness tester which slides along the axial direction of the pipeline;

the Lev hardness tester axially slides along the pipeline and comprises a reading ruler (2), a displacement knob (3) and a movable clamping head (5);

the concave angle of the fixed V-shaped jaw (11) is 150 degrees, and meanwhile, a hole is formed in the V-shaped jaw (11) and is communicated with the fixed base (12) of the Lev hardness tester;

the fixed base (12) of the Reed hardness tester, the movable clamping head (5) and the reading ruler (2) are integrated, and move along the axial direction of the pipeline along with the movable clamping head (5);

the movable clamping head (5) is connected with the fixed V-shaped jaw (11) through a dovetail groove, the displacement knob (3) can rotate, and the movement of the movable clamping head (5) is controlled through an internal screw rod.