Device for testing peel strength of anticorrosive coating of small-diameter pipeline

Abstract

The utility model discloses a device for testing peel strength of an anticorrosive coating of a small-diameter pipeline and belongs to the technical field of pipeline anticorrosive coating detection. The device comprises a clamping device, a moving device and a fixing device, and is matched with a tensile testing machine to test the peel strength of the anticorrosive coating of the small-diameter pipeline; wherein the clamping device is used for clamping and fixing a small-diameter pipeline anticorrosive coating stripping strip; the moving device is used for adapting to the length of the small-diameter pipeline and moving the small-diameter pipeline, so that peel strength testing is carried out on the small-diameter pipelines with different lengths or anticorrosive coatings at different positions of the small-diameter pipelines, and it is ensured that the peeled parts of the anticorrosive coatings are always subjected to the action of 90-degree axial force; and the fixing device is used for movably fixing the whole device on the tensile testing machine. The device is ingenious in design and rigorous in structure, and fully considers the test requirements, so that the test of the peel strength of the anticorrosive coating becomes simpler, more convenient and more accurate.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipeline anti-corrosion layer detection, and particularly relates to a device for testing the peeling strength of anti-corrosion layers of small-diameter pipelines. Background Art

[0002] With the widespread application of pipelines in industrial fields such as oil and natural gas, the anti-corrosion performance of pipelines is crucial to ensuring the safe operation of pipelines. Therefore, testing the peeling strength of the pipeline anti-corrosion layer is an important means to ensure whether the pipeline anti-corrosion performance is compliant. In practical applications, because daily drinking water, household water, drainage irrigation and other scenarios need to take into account daily life, saving materials and labor costs, it is necessary to use small-diameter pipes that are light, pressure-resistant and low-cost. However, the existing pipeline anti-corrosion layer peeling strength testing device has problems such as complex operation and low precision in testing small-diameter pipes, and cannot meet actual testing needs. Therefore, the development of a device suitable for peeling strength testing of anti-corrosion layers of small-diameter pipes has important practical significance and market demand. The device is mainly used to perform peeling strength testing on the anti-corrosion layer of small-diameter pipes, and needs to have the characteristics of simple operation, high precision and strong reliability.

[0003] Currently, most laboratory tests are performed using dynamometers. However, with the continuous advancement of technology, the need for testing in specific areas has gradually become prominent. In this context, traditional dynamometers cannot meet the requirements for accurate measurement in terms of operation or test results, and cannot be applied in actual engineering scenarios. Testing the peel strength of anti-corrosion coatings has always been a difficult problem facing the small-diameter pipeline industry. Utility Model Content

[0004] In response to the problems existing in the prior art, the present invention provides a device for testing the peeling strength of the anti-corrosion layer of small-diameter pipelines, ensuring the safe operation of small-diameter pipelines; the device is cleverly designed and has a rigorous structure, fully considering the needs of the test, making the peeling strength test of the anti-corrosion layer simpler and more accurate.

[0005] The utility model discloses a device for testing the peeling strength of the anti-corrosion layer of a small-diameter pipeline, comprising a clamping device, a moving device and a fixing device, which cooperates with a tensile testing machine to perform the peeling strength test of the anti-corrosion layer of the small-diameter pipeline; wherein the clamping device is used to clamp and fix the peeling strip of the anti-corrosion layer of the small-diameter pipeline; the moving device is used to adapt to the length of the small-diameter pipeline and move the small-diameter pipeline, so as to realize the peeling strength test of the anti-corrosion layer of small-diameter pipelines of different lengths or at different positions of the small-diameter pipeline, and ensure that the peeling point of the anti-corrosion layer is always subjected to a 90° axial force; the fixing device is used to move and fix the entire device on the tensile testing machine.

[0006] The clamping device, moving device, and fixing device cooperate to perform the peel strength test of the anti-corrosion coating on small-diameter pipes. The clamping device is capable of securely clamping the peeling strip of the anti-corrosion coating on small-diameter pipes. The moving device can be flexibly moved to facilitate peel strength testing of the anti-corrosion coating on small-diameter pipes of varying lengths or at different locations on small-diameter pipes. The moving device rotates via bearing 6, ensuring that the peeling point of the anti-corrosion coating is always subjected to a 90° axial force, thereby ensuring the accuracy of the peel strength test. The fixing device flexibly connects the entire device to the tensile testing machine.

[0007] The clamping device includes an installation fixture 12 and a fixing fixture 13. The installation fixture 12 is provided with an open groove. The fixing fixture 13 is provided in the open groove of the installation fixture 12. The fitting surfaces of the fixing fixture 13 and the installation fixture 12 are both provided with serrations to increase the clamping force and facilitate the detachment of the corrosion layer sample after the peeling strength test. A threaded hole or a through hole is provided on one side of the open groove of the installation fixture 12. The bolt is used to tightly fit or loosen the fixing fixture 13 and the installation fixture 12 through the threaded hole; or the bolt is used to tightly fit or loosen the fixing fixture 13 and the installation fixture 12 through the through hole through the nut; the positioning block 14 is provided between the installation fixture 12 and the fixing fixture 13, and is used to position the fixing fixture 13 to ensure that the fixing fixture 13 does not fall off due to the unscrewing of the bolt, and to fix the fixing fixture 13 between the installation fixtures 12.

[0008] Furthermore, a through hole is provided at one end of the mounting fixture 12 of the clamping device away from the connecting fixing fixture 13 , and is used to fix the clamping device and the upper shaft 17 of the stretching machine together through a fixing pin 19 .

[0009] The fixing device includes a fixing plate 1, and concave slide rails are provided on both sides of the upper surface of the fixing plate 1. The bottom of the fixing plate 1 is movably connected to the lower plate 18 of the tensile testing machine. The preferred connection method is to connect through the hexagon socket bolts 16 set on the fixing plate 1.

[0010] There are two sets of mobile devices. The two sets of mobile devices are respectively provided with sliders 4 at the positions of the slide rails to adjust the distance between the two sets of mobile devices, thereby realizing the testing of small-diameter pipelines of different lengths.

[0011] Each set of moving devices includes a corresponding support plate 9, a bearing 6, a core shaft 7 and a third bolt 8. The support plate 9 is movably connected to the slider 4 set at the corresponding slide rail position. A through hole is set at the connection between the slider 4 and the support plate 9. The slider 4 is set in the slide rail using a second bolt 5. The position change of the slider 4 changes the distance between the support plates 9 corresponding to the two sets of moving devices.

[0012] Furthermore, the slider 4 and the corresponding support plate 9 are connected by bolts, and a washer 3 and a spring washer 2 are provided.

[0013] A groove and a through hole for placing a bearing 6 are provided at the connection point between each support plate 9 and the core shaft 7. The bearing 6 is provided in the groove. A third bolt 8 connects the bearing 6 and the core shaft 7 through the through hole and fixes them to the support plate 9. The core shaft 7 is used to sleeve a small-diameter pipe. The bearing 6 is used to rotate the corrosion layer specimen as the peel strength test proceeds, keeping the test portion of the corrosion layer specimen always subjected to a 90° axial force.

[0014] The movable device, through the use of bearing 6 and third bolt 8, allows the support plate 9 and core shaft 7 to be tightly connected, ensuring the stability and reliability of the entire device. The bearing 6 allows the core shaft 7 to rotate, enabling the peel strength test of the anti-corrosion coating at different locations on small-diameter pipes.

[0015] Furthermore, the core shaft 7 is provided with an inclined core sleeve, and the inclined portion can realize the peeling strength test of the anti-corrosion layer of pipelines with different diameters.

[0016] Furthermore, the corrosion layer sample clamped by the clamping device is parallel to the direction of the slide rail provided on the fixing plate of the fixing device.

[0017] Compared with the prior art, the device for testing the peeling strength of the anti-corrosion coating of small-diameter pipelines of the present invention has the following advantages:

[0018] The device provided by this utility model can be applied in the small-diameter pipeline industry. It not only solves the problem of peel strength testing of anti-corrosion coatings, but also offers higher precision than dynamometers in laboratory tensile testing, improving testing efficiency and accuracy. This is of great significance for ensuring the safe operation of small-diameter pipelines. As my country's pipeline infrastructure continues to improve, the application prospects of this device are very broad.

[0019] The device provided by the utility model provides strong technical support for the small diameter pipeline industry and effectively solves the problem of anti-corrosion layer peeling strength testing. The device has a compact structure, is easy to operate, and has high reliability.

[0020] The device provided by the utility model can be conveniently installed on a tensile testing machine and is equipped with a slider 4, so that peeling strength tests of different areas of the anti-corrosion layer can be performed.

[0021] The method of using the device for testing the peeling strength of the anti-corrosion layer of a small-diameter pipeline of the present invention is as follows: the small-diameter pipeline to be tested is placed on the core shaft (7) of the mobile device, and after adjusting the position of the slider (4) of the mobile device on the slide rail according to the length of the small-diameter pipeline, the hexagon socket in the mobile device is tightened to fix the spacing between the support plates. The anti-corrosion layer on the small-diameter pipeline is cut open, and the test part is clamped vertically between the installation fixture and the fixed fixture of the clamping device, and the other end of the installation fixture is connected to the upper shaft of the tensile machine. When the cut anti-corrosion layer strip is at 90°, the test can be started. The fixed plate 1 provided with the slide rail is installed on the lower plate 18 of the tensile testing machine for testing the anti-corrosion small-diameter pipeline in the laboratory. The tensile speed is controlled by the tensile testing machine, and the device of the present invention is used to improve the accuracy and controllability of the test, and it can be applied to the peeling strength test of the anti-corrosion layer of different small-diameter pipelines. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of an embodiment of the utility model;

[0023] Figure 2 A schematic diagram of the parts structure of the clamping device of the utility model;

[0024] Figure 3 Schematic diagram of the parts structure of the moving device and the fixing device of the utility model;

[0025] Figure 4 Schematic diagram of the parts structure of the mobile device of the utility model.

[0026] Description of Figure Numbers:

[0027]

[0028] DETAILED DESCRIPTION

[0029] In order to more clearly explain the above-mentioned purpose of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0030] The following description details many specific details to help fully understand the present invention. However, the present invention can also be implemented in other ways different from the embodiments described, and therefore, the present invention is not limited to the scope of the specific embodiments described in the specification.

[0031] Example: Figure 1-4The figure shows a schematic diagram of a device for testing the peel strength of the anti-corrosion coating on small-diameter pipes, including an overall diagram of the device and schematic diagrams of the components of some of its structures. A fixed plate 1 is movably connected to the lower plate 18 of the tensile tester and can also be moved within the tensile tester to perform peel strength tests on the anti-corrosion coating at different locations on the small-diameter pipe. After determining the test position, the fixed plate 1 and the lower plate 18 of the tensile tester are fixed with hexagon socket bolts 16. A mounting fixture 12 secures the clamping device to the top of the tensile tester, with the clamping direction parallel to the movable direction of the fixed plate 1, ensuring that the tensile force on the steel pipe's anti-corrosion coating is an axial force at 90 degrees.

[0032] The specific configuration and functions of the clamping device, the moving device and the fixing device are described in detail below.

[0033] like Figure 2 As shown, the clamping device includes a mounting fixture 12, a fixing fixture 13, an M12 nut 10, a positioning block 14, and a first bolt 15. The entire clamping device is fixed to the upper end of the tensile testing machine through the hole set above the mounting fixture 12, that is, connected to the tensile machine upper shaft 17 of the tensile testing machine. The fixing fixture 13 is installed in the mounting fixture 12 through the M12 nut 10, the first bolt 15, and the positioning block 14. The fixing fixture 13 is provided with a slot provided with the positioning block. When the positioning block 14 is located in the slot, the first bolt 15 and the M12 nut 10 are inserted into the through hole provided in the mounting fixture. The fixing fixture 13 is pushed by the cooperation of the first bolt 15 and the M12 nut 10, so that the fixing fixture 13 and the mounting fixture 12 are tightly fitted. The fitting surfaces of the fixing fixture 13 and the installation fixture 12 are both made into serrated shapes, which can better clamp the polyethylene surface and hot melt adhesive surface of the steel pipe anti-corrosion layer, prevent the hot melt adhesive from sticking to the fixture and polyethylene and sliding, ensure the accuracy of the experimental data, and facilitate the removal of the anti-corrosion layer.

[0034] like Figure 3 As shown, the moving device includes two support plates 9, each support plate is provided with a corresponding slider 4, a corresponding second bolt 5, a corresponding spring washer 2, and a corresponding washer 3. The support plate 9 is slid through the slider 4 to be set in the slide rail on the fixed plate 1 of the fixing device through the second bolt 5, the spring washer 2 and the washer 3. Four holes are opened on the support plate 9 to facilitate the adaptation to different pipeline lengths and the adjustment of the pipeline anti-corrosion layer stripping area. The test requires frequent adjustment of the slider 4. The spring washer 2 used can reduce the wear on the bolts and increase the service life of the device.

[0035] like Figure 4As shown, the moving device also includes a mandrel 7, bearing 6, and third bolt 8. Each support plate 9 is equipped with a mandrel 7, bearing 6, and third bolt 8 for securing small-diameter pipes. The third bolt 8 sequentially secures the support plate 9, bearing 6, and mandrel 7 together. This allows the small-diameter pipe to rotate, maintaining the axial tensile stress on the anti-corrosion layer at a constant 90° angle, resulting in more accurate test results. The bevel of the mandrel 7 is suitable for a wide range of small-diameter pipes and can be adjusted to accommodate different pipe diameters.

[0036] When peel strength tests are performed on multiple locations, it is only necessary to loosen the slider 4 after the test of one location is completed, move the slider 4 to the next test location, and then tighten the slider to perform the test.

[0037] Working principle: This small-diameter pipeline anti-corrosion layer peeling strength test device is installed on a tensile testing machine and is used for laboratory pipeline anti-corrosion layer peeling strength testing. First, fix the fixing plate 1 on the tensile machine lower plate 18 of the tensile testing machine according to the test position, first remove one of the support plates 9, then install the small-diameter pipeline on the core shaft 7 on the other side, and then insert the core shaft 7 of the removed support plate 9 into the pipeline, align the slider 4 with the slide rail and install it. At this time, all sliders 4 are not tightened first, and then tightened after the test position is adjusted. Before the test, according to the experimental requirements, the anti-corrosion layer of the pipeline to be tested is cut into some long strips in the circumferential direction at the test position. The clamping device is connected to the tensile machine upper shaft 17 of the tensile testing machine through the hole on the mounting fixture 12, and is fixed with a fixing pin 19, and then the slider 4 is moved so that the peeling strip to be tested is located directly below the clamping device. Clamp the peeled anti-corrosion coating strip on the tensile machine shaft 17 of the tensile testing machine through the clamping device. Align the centerline of the anti-corrosion coating strip with the axis of the clamping device. The clamping part should not be too short. Tighten the first bolt 15 so that the fixture clamps the anti-corrosion coating strip. The clamping force should not be too large and the anti-corrosion coating strip will not slip. Then tighten the slider 4. During the experiment, all bolts need to be kept tightened to prevent loosening and affecting the experimental results. Before starting the test, adjust the test parameters according to the test requirements, then start the tensile testing machine and record the required data. The fixed plate 1 facilitates the slider 4 and the second bolt 5 to fix the support plate 9; the support plate 9 facilitates the support of the core shaft 7; the core shaft 7 facilitates the fixation of the small-diameter pipe 11; the bearing 6 facilitates the free rotation of the steel pipe and reduces the influence of friction on the test results; the slide rail and slider 4 on the fixed plate 1 facilitate the sliding of the support plate 9 along the slide rail on the fixed plate 1 to change the peeling strength test position; the equipment composed of the fixed plate 1, the core shaft 7, the support plate 9, the small-diameter pipe 11 and the bearing 6 ensures the stripping speed and force angle, and keeps the force direction of the anti-corrosion layer always at a 90° angle to the steel pipe surface.

[0038] The above embodiments are merely preferred examples of the present invention and do not limit the scope of the present invention. Any equivalent structure or equivalent process transformation based on the present invention's description and drawings, or any direct or indirect application in other related technical fields, shall be equally included in the scope of the present invention's patent protection.

Claims

1. A device for testing the peeling strength of anti-corrosion coatings on small-diameter pipelines, characterized in that: The device for testing the peeling strength of the anti-corrosion layer of a small-diameter pipeline includes a clamping device, a moving device and a fixing device, and is used in conjunction with a tensile testing machine to perform the peeling strength test of the anti-corrosion layer of the small-diameter pipeline; wherein the clamping device is used to clamp and fix the peeling strip of the anti-corrosion layer of the small-diameter pipeline; the moving device is used to adapt to the length of the small-diameter pipeline and move the small-diameter pipeline, so as to realize the peeling strength test of the anti-corrosion layer of small-diameter pipelines of different lengths or at different positions of the small-diameter pipeline, and ensure that the peeling point of the anti-corrosion layer is always subjected to a 90° axial force; the fixing device is used to move and fix the entire device on the tensile testing machine.

2. The device for testing the peeling strength of the anti-corrosion coating of a small diameter pipeline according to claim 1 is characterized in that: The clamping device, the moving device and the fixing device cooperate with each other to jointly complete the test of the peeling strength of the anti-corrosion layer of the small-diameter pipeline; the clamping device can firmly clamp the peeling strip of the anti-corrosion layer of the small-diameter pipeline; the moving device can be flexibly moved to facilitate the peeling strength test of the anti-corrosion layer of the small-diameter pipeline or the anti-corrosion layer at different positions of the small-diameter pipeline, and rotate through the bearing (6) so that the peeling position of the anti-corrosion layer is always subjected to a 90° axial force, thereby ensuring the accuracy of the peeling strength test; the fixing device movably connects the entire device to the tensile testing machine.

3. The device for testing the peeling strength of the anti-corrosion coating of a small diameter pipeline according to claim 1, characterized in that: The clamping device comprises an installation fixture (12) and a fixing fixture (13), the installation fixture (12) is provided with an open groove, the fixing fixture (13) is arranged in the open groove of the installation fixture (12), the fitting surfaces of the fixing fixture (13) and the installation fixture (12) are both provided with serrations, a threaded hole or a through hole is provided on one side of the open groove of the installation fixture (12), a bolt is passed through the threaded hole to tightly fit or loosen the fixing fixture (13) and the installation fixture (12); or a bolt is passed through the through hole through a nut to tightly fit or loosen the fixing fixture (13) and the installation fixture (12); a positioning block (14) is provided between the installation fixture (12) and the fixing fixture (13) to position the fixing fixture (13) and ensure that the fixing fixture (13) does not fall due to the unscrewing of the bolt, and the fixing fixture (13) is fixed between the installation fixtures (12).

4. The device for testing the peeling strength of the anti-corrosion coating of a small diameter pipeline according to claim 1, characterized in that: A through hole is provided at one end of the mounting fixture (12) of the clamping device away from the connecting fixing fixture (13), and is used to fix the clamping device and the upper shaft (17) of the stretching machine together through a fixing pin (19).

5. The device for testing the peeling strength of the anti-corrosion coating of a small diameter pipeline according to claim 1, characterized in that: The fixing device comprises a fixing plate (1), and concave slide rails are arranged on both sides of the upper surface of the fixing plate (1). The lower part of the fixing plate (1) is movably connected to the lower plate (18) of the tensile testing machine.

6. The device for testing the peeling strength of the anti-corrosion coating of a small diameter pipeline according to claim 1, characterized in that: The movable device is provided with two sets, and the two sets of movable devices are respectively provided with sliders (4) at the slide rail positions of the fixed plate (1) to adjust the distance between the two sets of movable devices, thereby realizing the testing of small-diameter pipelines of different lengths.

7. The device for testing the peeling strength of the anti-corrosion coating of a small-diameter pipeline according to claim 1 or 6, characterized in that: Each set of moving devices includes a support plate (9), a bearing (6), a core shaft (7) and a third bolt (8). The support plate (9) is movably connected to a slider (4) arranged at a corresponding position of the slide rail. A through hole is provided at the connection between the slider (4) and the support plate (9). The slider (4) is arranged in the slide rail by a second bolt (5). The position change of the slider (4) changes the interval between the support plates (9) corresponding to the two sets of moving devices. A groove and a through hole for placing the bearing (6) are provided at the connection position of each support plate (9) to the core shaft (7). The bearing (6) is arranged in the groove. The third bolt (8) connects the bearing (6) and the core shaft (7) through the through hole and fixes them on the support plate (9). The core shaft (7) is used to sleeve a small-diameter pipe. The bearing (6) is used to rotate the corrosion layer sample as the peeling strength test proceeds, so as to keep the test part of the corrosion layer sample always subjected to a 90° axial force.

8. The device for testing the peeling strength of the anti-corrosion coating of a small diameter pipeline according to claim 1, characterized in that: The core shaft (7) is provided with an inclined sleeve core, and the inclined portion can realize the peeling strength test of the anti-corrosion layer of pipelines with different diameters.

9. The device for testing the peeling strength of the anti-corrosion coating of a small diameter pipeline according to claim 1, characterized in that: The installation direction of the clamping part of the clamping device is parallel to the direction of the slide rail arranged on the fixing plate of the fixing device.

10. The device for testing the peeling strength of the anti-corrosion coating of a small diameter pipeline according to claim 1, characterized in that: The core shaft (7) can be rotated by the bearing (6), thereby realizing the peeling strength test of the anti-corrosion layer at different positions of the small-diameter pipeline.

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