Indentation testing device for pipeline welding seam detection

Abstract

The utility model relates to the technical field of pipeline testing devices, and discloses an indentation testing device for pipeline welding seam detection, which comprises a plurality of support plates, a plurality of indentation testing components and a fixing part, the plurality of support plates are planar plates and are arranged in a line, the plurality of indentation testing components are connected to the middle parts of the support plates in a one-to-one correspondence manner, and the fixing part is connected with the indentation testing components in a one-to-one correspondence manner. The indentation testing assembly comprises a pressure head used for applying indentations to the outer wall of the pipeline and a telescopic push rod used for providing loading driving force for the pressure head, the multiple supporting plates wrap the outer wall of the pipeline so that the pressure head in the indentation testing assembly can extend in the direction of the center line of the pipeline, and the fixing piece is connected with the two supporting plates on the outermost side to fix the indentation testing assembly. The supporting plates are fixed to the outer wall of the pipeline by clamping the outer wall of the pipeline. According to the device, multi-position synchronous nondestructive testing high-flux indentation testing can be carried out on the pipeline welding seam in the environment of the same time period and the same temperature and humidity, and the accuracy and comparability of experimental data are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline testing device technical field, especially a kind of indentation testing device for pipeline weld detection. BACKGROUND

[0002] In nuclear power, petrochemical, electric power and other industries, a large number of special pressure-bearing equipment is needed, and the special pressure-bearing equipment is usually a large-diameter and thick-walled cylinder structure. These pressure-bearing equipment usually serves in extreme environments such as high temperature, high pressure and corrosion. Due to the influence and limitation of various factors in the welding site, the welding quality of the weld is scattered and uneven. The geographic location and environment of pipeline laying, such as mountain movement, earthquake and other crustal changes and geological disasters, make the pipeline welding point sometimes bear internal pressure and external axial load. During long-term service, the mechanical properties will gradually degrade, resulting in a decrease in carrying capacity and an increase in failure risk. Therefore, it is necessary to regularly detect the mechanical properties of the pipeline.

[0003] Currently, for the detection of the strength of the in-service pipeline weld, the traditional destructive test is usually used to cut and process the pipeline weld into a conventional standard tensile specimen, and then the mechanical tension is used to measure the accurate material strength. However, this method directly damages the pipeline structure and has the problems of low detection efficiency and high subsequent repair and maintenance cost. Therefore, a pressure indentation testing device is used to replace the destructive tensile test. The pressure indentation testing device usually includes a connecting part and an indentation testing part. The indentation testing part for detection includes a precision electric push rod with a telescopic displacement sensor, a load sensor and a diamond indenter. Three sampling points are usually taken at one weld for detection. Specifically, the push rod drives the indenter to load and unload at a sampling point on the surface of the pipeline weld, and the load sensor records the force value during the test. The displacement sensor records the indentation depth to obtain the force-indentation curve of the material. Through the calculation of the force-indentation curve, the yield strength, tensile strength and residual stress of the material are obtained.

[0004] Due to the special underground environmental factors, the temperature and humidity change at different times. The pipeline is easy to oxidize under different humidity conditions, and the state and mechanical properties of the material are different. The hardness, elastic modulus and other mechanical properties of the underground pipeline are also different at different temperatures. However, the existing indentation testing device can only realize single indentation test at the same time, and cannot continuously realize multi-point indentation test under the same pressure at the same time, temperature and humidity. This will undoubtedly lead to inconsistent indentation size and depth, affecting the accuracy and comparability of experimental data. UTILITY MODEL CONTENT

[0005] The utility model provides a kind of indentation testing device for pipeline weld detection, the device can carry out the synchronous nondestructive testing high-flux indentation test of multiple positions under the environment of same temperature and humidity in the same period to the pipeline weld, guarantee the accuracy and comparability of experimental data.

[0006] The utility model provides a kind of indentation testing device for pipeline weld detection, it includes: multiple support plates, multiple indentation testing components, fixed parts, multiple support plates are all plane board, multiple support plates are in a straight line, and the end of adjacent two support plates is hinged, multiple indentation testing components are connected in the middle of each support plate one by one, indentation testing component includes the indenter for applying indentation to pipeline outer wall and telescopic push rod for providing loading driving force for indenter, multiple support plates are wrapped around pipeline outer wall, so that the indenter in indentation testing component extends to the center line direction of pipeline, fixed part is connected with the outermost two support plates, and each support plate is fixed with the outer wall of pipeline by clamping pipeline outer wall.

[0007] Preferably, the fixed part is in the form of a chain, and the two ends of the fixed part are connected to the outermost two support plates, respectively. The fixed part and the multiple support plates are tightly fitted around the outer wall of the pipeline to fix the positions of the indentation testing components.

[0008] Preferably, the indentation testing component further comprises a displacement sensor, a load sensor, and a grid scale fixing plate. The displacement sensor is connected to the telescopic end of the telescopic push rod, the load sensor is connected to the displacement sensor, and the grid scale fixing plate is connected to the load sensor. The indenter is connected to the grid scale fixing plate through an indenter clamping member.

[0009] Preferably, the inner plate surface of each support plate is extended and fixed with a clamping plate for abutting against the outer wall of the pipeline on both sides near the position of the corresponding indentation testing component. The indentation testing component is placed in the cavity between the two clamping plates.

[0010] Preferably, a through hole is formed in the middle of the support plate along the thickness extension direction of the support plate. The fixed part of the telescopic push rod is connected to the through hole, and the telescopic part extends into the cavity.

[0011] Preferably, the fixed part is a detachable chain. The two ends of the chain are hingedly connected to the outer walls of the outermost two support plates through hinge shafts.

[0012] Preferably, the material of the support plate is metal.

[0013] Preferably, the number of support plates is three, and the length of the support plate is greater than the radius of the pipeline.

[0014] Compared with the prior art, the beneficial effects of the device are that: the plurality of support plates are sequentially hinged through the hinge structure, when the plurality of support plates wrap the outer wall of the pipeline weld, the support plates extend in the tangential direction to ensure that the indenter in each indentation testing assembly extends to the center line direction of the pipeline, and when the indenter is driven by the driving force of the telescopic push rod, the radial force of the outer wall of the pipeline can be pressed, so that the indentation dotting effect is realized, and the whole device can realize high-throughput indentation test experiment on the weld surface of different pipe diameters. The device can realize dotting at the same time on the same weld surface at different positions in the same period after single wrapping and bundling fixation, the pipeline weld deforms at different positions at the same time, the pipeline weld high-throughput indentation testing device provided by the device only needs to be tested once, and can accurately, quickly and efficiently perform multi-position synchronous nondestructive testing high-throughput indentation test on the pipeline weld under the same temperature and humidity environment at the same time, so as to meet the basic requirements of high-throughput and rapid testing of the pipeline weld, and guarantee the accuracy and comparability of the experimental data. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A structure schematic view of the indentation testing device for pipeline weld detection provided by the embodiment of the utility model;

[0016] Figure 2 A structure schematic view of the indentation testing device for pipeline weld detection provided by the embodiment of the utility model from the front view;

[0017] Figure 3 A structure schematic view of the indentation testing device for pipeline weld detection provided by the embodiment of the utility model from the front view;

[0018] BRIEF DESCRIPTION OF DRAWINGS:

[0019] 1, support plate; 2, indentation testing assembly; 21, indenter; 22, telescopic push rod; 23, displacement sensor; 24, load sensor; 25, grid scale fixed plate; 3, fixing part; 4, abutting plate. DETAILED DESCRIPTION

[0020] The embodiment of the utility model will be described in detail in combination with the drawings, but it should be understood that the protection scope of the utility model is not limited by the embodiment.

[0021] In the description of the utility model, it is understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the technical scheme of the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.

[0022] Reference Figure 1 , Figure 2 and Figure 3 , the utility model provides a kind of indentation testing device for pipeline weld detection, comprising: multiple support plates 1, multiple indentation test components 2, fixed part 3, multiple support plates 1 are all plane plate, multiple support plates 1 are in a straight line, and the end of adjacent two support plates 1 is hinged, multiple indentation test components 2 are connected to the middle part of each support plate 1 one by one, indentation test component 2 includes the indenter 21 for applying indentation to pipeline outer wall and telescopic push rod 22 for providing loading driving force for indenter 21, multiple support plates 1 are wrapped around pipeline outer wall, so that the indenter 21 in indentation test component 2 extends to the center line direction of pipeline, fixed part 3 is connected with the outermost two support plates 1, and each support plate 1 is fixed with the outer wall of pipeline by clamping pipeline outer wall.

[0023] In the above embodiment, the multiple support plates 1 of the device are sequentially hinged by the hinge structure, which can ensure that the indenter 21 in each indentation test component 2 extends to the center line direction of the pipeline when the multiple support plates 1 wrap the pipeline weld outer wall, and the indenter 21 can be pressed in the radial direction of the pipeline outer wall under the driving force of the telescopic push rod 22, thereby achieving the effect of indentation dotting. The entire device can perform high-throughput indentation test experiments on different pipe diameter weld surfaces in cooperation with the fixed part 3. The device can dot multiple different positions on the same weld surface at the same time after single wrapping, bundling and fixing. The pipeline weld deforms at different positions at the same time. Specifically, the temperature and humidity do not differ greatly at the same time, and corresponding indentations are generated on the surface of the pipeline weld, thereby realizing nondestructive testing of different positions on the pipeline weld under the same environment. Therefore, the pipeline weld high-throughput indentation testing device provided by the present scheme only needs to perform indentation testing once, and can accurately, quickly and efficiently perform high-throughput indentation test experiments on the pipeline weld. The device meets the basic requirements of high-throughput and rapid testing of pipeline welds, and guarantees the accuracy and comparability of experimental data.

[0024] Further, the embodiment also has the advantages of simple operation and reliability, realizes the effect of pipeline size self-adaptation, and is particularly suitable for high-throughput and long pipeline, and has higher efficiency of indentation test.

[0025] Further, with reference to Figure 1 and Figure 2 , the fixing member 3 is in a chain shape, two ends of the fixing member 3 are connected with the two outermost support plates 1 respectively, and the fixing member 3 and the plurality of support plates 1 are tightly sleeved on the outer wall of the pipeline to fix the position of the indentation test assembly 2.

[0026] In the above embodiment, the chain-shaped fixing member 3 can rotate and deform while being fixed to the indentation test device of the weld of different pipe diameters. In addition to the chain-shaped embodiment, the fixing member 3 can also be a rope body or even a rope body with elasticity, and the main purpose is to tightly adhere to the outer wall of the pipeline together with the plurality of articulated support plates 1.

[0027] Further, with reference to Figure 2 and Figure 3 , the indentation test assembly 2 further comprises a displacement sensor 23, a load sensor 24, and a grid fixed plate 25, the displacement sensor 23 is connected to the telescopic end of the telescopic push rod 22, the load sensor 24 is connected to the displacement sensor 23, the grid fixed plate 25 is connected to the load sensor 24, and the indenter 21 is connected to the grid fixed plate 25 through the indenter 21 clamping member.

[0028] In the above embodiment, the displacement sensor 23 transmits data to the computer processing module for calculation to obtain the mechanical property parameters of the pipeline weld, realizes high-throughput test of the indentation performance of each position of the pipeline weld, and improves the accuracy and test efficiency of the indentation test.

[0029] Further, with reference to Figure 1 and Figure 2 , the inner plate surface of each support plate 1 is extended and fixed with a clamping plate 4 for abutting against the outer wall of the pipeline on both sides near the position of the corresponding indentation test assembly 2, and the indentation test assembly 2 is arranged in the cavity between the two clamping plates 4.

[0030] In the above embodiment, the clamping plate 4 is provided to provide sufficient telescopic space for the telescopic extension of the indenter 21, and also provides a placement space for the displacement sensor 23 and other components. The clamping plate 4 is directly used to replace the direct contact of the support plate 1 with the outer wall of the pipeline, and since the number is two, the effect of preventing deviation and rotation after abutting can be further improved.

[0031] Further, with reference to Figure 1 and Figure 2The middle part of the support plate 1 is provided with a through hole extending along the thickness direction, and the fixed part of the telescopic push rod 22 is connected to the through hole, and the telescopic part extends into the cavity.

[0032] In the above embodiment, the through hole is used for the protruding effect of the fixed part of the telescopic push rod 22.

[0033] Further, referring to Figure 1 and Figure 2 The fixing member 3 is a detachable chain, and the two ends of the chain are hingedly connected to the outer walls of the two outermost support plates 1 through hinge shafts.

[0034] In the above embodiment, the chain is selected because it can achieve the effect of free disassembly. When a relatively thin pipe diameter is encountered, the corresponding number of chain hinge members are adaptively disassembled, and vice versa. The selected chain is also relatively common and easy to manufacture the entire device.

[0035] Further, referring to Figure 1 and Figure 2 The material of the support plate 1 is metal.

[0036] In the above embodiment, by limiting the material of the support plate 1, a relatively stable support force can be provided for the indentation test process.

[0037] Further, referring to Figure 1 and Figure 2 The number of support plates 1 is three, and the length of the support plate 1 is greater than the radius of the pipeline.

[0038] In the above embodiment, the number of support plates 1 is three, which corresponds to the current conventional three-point method for one weld.

[0039] Method of use and working principle: one end of the chain is disassembled, and each support plate 1 is tightly attached to the outer wall of the pipeline by the abutting plate 4, so that the diamond indenter 21 extends in the direction of the center line of the pipeline. At this time, the disconnected end of the chain is reconnected to the end of the corresponding side support plate 1 to ensure that the entire device will not be offset. When starting the test, the telescopic push rod 22 of the precision actuator drives the measuring sensor and the indenter 21 and other components to move towards the pipeline weld. If the thickness of the weld is known, the instrument can quickly move according to the relative displacement between the indenter 21 and the weld, and quickly approach the upper surface of the weld. When the indenter 21 contacts the weld, the load sensor 24 will receive force feedback, and this contact point is set as the contact zero point. Then, according to the predetermined loading mode and loading test parameters, the loading, holding and unloading processes are completed, and after the test is completed, the indenter 21 returns to the initial position with the push rod.

[0040] The load sensor 24 and the displacement sensor 23 transmit the collected load and displacement information to the measurement and control software on the computer, the mechanical property parameters such as the contact stiffness, the elastic modulus and the indentation hardness of the weld are obtained by analyzing and calculating through the set algorithm in the software, then the test report or the original data can be selected and exported, and thus a complete indentation test is completed.

[0041] The above disclosed are only several specific embodiments of the present application, but the embodiments of the present application are not limited to this, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present application.

Claims

1. An indentation testing device for inspecting pipe welds, characterized in that, include: Multiple support plates (1) are flat plates, and the multiple support plates (1) are arranged in a line, with the ends of two adjacent support plates (1) hinged together; Multiple indentation test components (2) are connected one-to-one to the middle of each of the support plates (1). Each indentation test component (2) includes an indenter (21) for applying indentation to the outer wall of the pipe and a telescopic push rod (22) for providing loading driving force to the indenter (21). The multiple support plates (1) wrap around the outer wall of the pipe so that the indenter (21) in the indentation test component (2) extends toward the centerline of the pipe. The fastener (3) is connected to the two outermost support plates (1) and clamps the outer wall of the pipe so that each support plate (1) is fixed to the outer wall of the pipe.

2. The indentation testing device for pipeline weld inspection as described in claim 1, characterized in that, The fastener (3) is chain-shaped, and the two ends of the fastener (3) are respectively connected to the two outermost support plates (1). The fastener (3) and the multiple support plates (1) are tightly fitted onto the outer wall of the pipe to fix the position of the indentation test assembly (2).

3. The indentation testing device for pipeline weld inspection as described in claim 1, characterized in that, The indentation testing component (2) also includes: Displacement sensor (23) is connected to the telescopic end of telescopic push rod (22); A load sensor (24) is connected to a displacement sensor (23); The grid ruler fixing plate (25) is connected to the load sensor (24), and the pressure head (21) is connected to the grid ruler fixing plate (25) through the pressure head (21) clamping member.

4. The indentation testing device for pipeline weld inspection as described in claim 3, characterized in that, Each of the support plates (1) has a retaining plate (4) extending and fixed to both sides of the inner plate surface near the position of the corresponding indentation test component (2) for abutting against the outer wall of the pipe. The indentation test component (2) is placed in the cavity between the two retaining plates (4).

5. The indentation testing device for pipeline weld inspection as described in claim 4, characterized in that, The support plate (1) has a through hole in the middle along its thickness extension direction, the fixed part of the telescopic push rod (22) is connected to the through hole, and the telescopic part extends into the cavity.

6. The indentation testing device for pipeline weld inspection as described in claim 2, characterized in that, The fastener (3) is a detachable chain, and the two ends of the chain are hinged to the outer walls of the two outermost support plates (1) through hinge shafts.

7. The indentation testing device for inspecting pipe welds as described in claim 1, characterized in that, The support plate (1) is made of metal.

8. The indentation testing device for pipeline weld inspection as described in claim 1, characterized in that, The number of support plates (1) is three, and the length of the support plate (1) is greater than the radius of the pipe.

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