Method for detecting adhesive force of mixed insulator

Abstract

The invention discloses a method for detecting adhesive force of a hybrid insulator, which comprises the following steps of: performing static heat insulation test treatment on a silicon rubber layer of the hybrid insulator, and judging whether the silicon rubber layer has a bulge or not; if not, determining that the adhesive force between the porcelain piece of the hybrid insulator and the silicone rubber layer meets the adhesive force requirement; if yes, the bump is cut; and when it is confirmed that the porcelain piece is exposed out of the cutting area of the bump, it is confirmed that the adhesive force between the porcelain piece of the mixed insulator and the silicone rubber layer does not meet the adhesive force requirement. In the static heat insulation test process, if the adhesive force between the silicone rubber layer and the porcelain piece is insufficient, when the silicone rubber layer is heated to expand, bumps are locally formed due to the fact that internal stress cannot be released. Therefore, the condition of the adhesive force between the silicone rubber layer and the porcelain piece can be intuitively judged by observing whether the silicone rubber layer swells or not in the static heat insulation test treatment process.

Description

Technical Field

[0001] The invention relates to the technical field of insulators, and in particular to an adhesion detection method for a hybrid insulator. Background Art

[0002] As an important carrier in the operation of power grid, transmission line covers a wide area, has a long line distance, and passes through complex and changeable geographical conditions. At present, there is a huge demand for insulators in transmission lines. The mechanical properties, electrical properties, aging characteristics and operating conditions of insulators have an extremely important impact on the safe operation of power grids. As a new type of insulator, hybrid insulators have the advantages of porcelain or glass insulators and composite insulators. The production process of hybrid insulators adopts high-temperature injection and one-time molding of high-temperature vulcanized silicone rubber coating process. The silicone rubber is sprayed on the surface of the porcelain part. After the curing is completed, it is necessary to simulate the thermal environment for static thermal insulation test. After the test, the adhesion between the coating and the porcelain part is assessed to determine whether it meets the design requirements. However, due to the characteristics of high-temperature vulcanized silicone rubber with thick film layer, low hardness and high toughness, the adhesion evaluation methods suitable for traditional insulators, such as pulling apart method, grid method, circle method, cross method, etc., are not suitable for hybrid insulators.

[0003] The pull-off method is a commonly used adhesion test method, but it is mainly suitable for thicker coatings and multi-layer systems. For the high-temperature vulcanized silicone rubber film layer in hybrid insulators, the pull-off method may not accurately reflect the actual bonding strength between the film layer and the substrate due to the thick film layer and high toughness. The grid method, circle method, and cross method mainly evaluate the bonding strength between the film layer and the substrate by scratching grids, circles, or forks of certain shapes and sizes on the surface of the film layer. However, for materials such as high-temperature vulcanized silicone rubber with high toughness and low hardness, these methods may not be able to effectively destroy the bond between the film layer and the substrate, and thus cannot accurately evaluate the adhesion. Summary of the invention

[0004] The embodiment of the present invention provides a method for detecting the adhesion of a hybrid insulator. By observing whether bulges appear on the silicone rubber layer, the adhesion between the silicone rubber layer and the porcelain part can be intuitively determined.

[0005] An embodiment of the present invention provides a method for detecting adhesion of a hybrid insulator, comprising:

[0006] Obtain a hybrid insulator to be tested; wherein the hybrid insulator comprises: a porcelain component and a silicone rubber layer wrapped on the surface of the porcelain component;

[0007] Performing a static heat insulation test on the silicone rubber layer of the hybrid insulator, and determining whether bulging occurs on the silicone rubber layer;

[0008] If not, confirming that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator meets the preset adhesion requirements;

[0009] If yes, cutting the bulge;

[0010] When it is confirmed that the porcelain component is exposed from the cutting area of ​​the bulge, it is confirmed that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator does not meet the adhesion requirement.

[0011] Furthermore, after the bulge is cut, the method further comprises:

[0012] When it is confirmed that the porcelain component is not exposed from the cutting area of ​​the bulge and the bulge is a bulge generated by the shallow surface layer of the silicone rubber layer, it is confirmed that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator meets the adhesion requirement.

[0013] Furthermore, after the bulge is cut, the method further comprises:

[0014] When it is confirmed that the porcelain piece is not exposed from the cutting area of ​​the bulge and the bulge is not a bulge generated by the shallow surface layer of the silicone rubber layer, the silicone rubber layer is cut into a plurality of strips of equal size;

[0015] Using a scraper to scrape away the middle area of ​​each strip at a fixed preset angle; wherein the chisel of the scraper touches the surface of the porcelain piece when scraping;

[0016] Determining whether there is an extended damage area on the coating in the peripheral area of ​​the strip that has not been removed;

[0017] If not, it is confirmed that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator meets the adhesion requirement.

[0018] Furthermore, after determining whether there is an extended damage area on the coating of the peripheral area where the strip is not removed, the method further includes:

[0019] If yes, then calculate the exposed area of ​​the ceramic component on the extended damage area and the area ratio of the exposed area on the extended damage area;

[0020] When it is confirmed that the area ratio is not greater than a preset first ratio threshold, it is confirmed that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator meets the adhesion requirement.

[0021] When it is confirmed that the area ratio is greater than a preset first ratio threshold, it is confirmed that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator does not meet the adhesion requirement.

[0022] Further, after confirming that the area ratio is greater than a preset first ratio threshold, the method further includes:

[0023] When it is confirmed that the area ratio is greater than a first ratio threshold value and is not greater than a preset second ratio threshold value, determining that the unqualified level of adhesion is a first level;

[0024] When it is confirmed that the area ratio is greater than a second ratio threshold and the strip has not fallen off, the unqualified level of the adhesion is determined to be the second level;

[0025] When it is confirmed that the area ratio is greater than the second ratio threshold and the strip falls off, it is determined that the unqualified level of adhesion is the third level.

[0026] Furthermore, the cutting of the bulge includes:

[0027] The bulge was cut based on 30% of the thickness of the silicone rubber layer.

[0028] Furthermore, the strip is 20 mm long and 80 mm wide.

[0029] Furthermore, the width of the scraper is 10 mm.

[0030] Furthermore, the preset angle is 30°.

[0031] Furthermore, the first ratio threshold is 50%, and the second ratio threshold is 80%.

[0032] The following beneficial effects are achieved by implementing the present invention:

[0033] The present invention discloses a method for detecting the adhesion of a hybrid insulator, wherein the silicone rubber layer of the hybrid insulator is subjected to a static insulation test, and it is determined whether a bulge appears on the silicone rubber layer; if not, it is determined that the adhesion between the porcelain part of the hybrid insulator and the silicone rubber layer meets the adhesion requirements; if so, the bulge is cut; when it is determined that the porcelain part is exposed from the cut area of ​​the bulge, it is determined that the adhesion between the porcelain part of the hybrid insulator and the silicone rubber layer does not meet the adhesion requirements. During the static insulation test, if the adhesion between the silicone rubber layer and the porcelain part is insufficient, when the silicone rubber layer is heated and expanded, bulges will be formed locally because the internal stress cannot be released. Therefore, the present invention can intuitively determine the adhesion between the silicone rubber layer and the porcelain part by observing whether a bulge appears on the silicone rubber layer during the static insulation test. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The present invention is a flowchart of a method for detecting adhesion of a hybrid insulator provided in an embodiment of the present invention.

[0035] Figure 2 It is a schematic structural diagram of a silicone rubber layer provided in one embodiment of the present invention.

[0036] Figure 3 It is a schematic diagram of the structure of a strip provided by an embodiment of the present invention.

[0037] Figure 4 is another schematic diagram of the structure of a strip provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0040] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0041] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0043] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0044] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0045] See also Figure 1 , is a flow chart of a method for detecting adhesion of a hybrid insulator provided by an embodiment of the present invention, comprising:

[0046] S1. Obtain a hybrid insulator to be tested; wherein the hybrid insulator comprises: a porcelain component and a silicone rubber layer wrapped on the surface of the porcelain component;

[0047] S2, performing a static heat insulation test on the silicone rubber layer of the hybrid insulator, and determining whether bulging occurs on the silicone rubber layer;

[0048] In a preferred embodiment of the present invention, the hybrid insulator is placed in an infrared room with the iron cap facing upward and the steel foot facing downward, and the hybrid insulator is placed in a high-intensity infrared environment for 10 minutes. The surface of the insulator silicone rubber layer is subjected to a static heat insulation test by thermal radiation. For insulators without bulging, it is determined that the coating adhesion meets the technical requirements, and for insulators with bulging, cutting is performed.

[0049] S3. If not, confirm that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator meets the preset adhesion requirements;

[0050] S4: If yes, cutting the bulge;

[0051] Preferably, the cutting of the bulge comprises:

[0052] S41, cutting the bulge based on 30% of the thickness of the silicone rubber layer.

[0053] Preferably, after the bulge is cut, the method further comprises:

[0054] S42. When it is confirmed that the bulge is a bulge generated by the shallow surface layer of the silicone rubber layer, it is confirmed that the adhesion between the porcelain component of the hybrid insulator and the silicone rubber layer meets the adhesion requirement.

[0055] In a preferred embodiment of the present invention, a utility knife is used to poke open the bulge of the hybrid insulator and observe the internal (cutting area) situation. If the bulge is only the shallow surface of the silicone rubber layer, it is determined that the coating adhesion meets the technical requirements; if the bulge area exposes the porcelain part, it is determined that it does not meet the technical requirements. If the bulge is observed to be deep and of a certain thickness (greater than 30% of the total thickness of the silicone rubber layer) after the bulge is poked open with a utility knife but has not yet reached the porcelain part, further tests are required.

[0056] S5. When confirming that the porcelain component is exposed from the cutting area of ​​the bulge, confirming that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator does not meet the adhesion requirement.

[0057] Preferably, after the bulge is cut, the method further comprises:

[0058] S6, when it is confirmed that the porcelain piece is not exposed from the cutting area of ​​the bulge and the bulge is not a bulge generated by the shallow surface layer of the silicone rubber layer, cutting the silicone rubber layer into a plurality of strips of equal size;

[0059] Preferably, the strip is 20 mm long and 80 mm wide.

[0060] Preferably, the width of the scraper is 10 mm.

[0061] Preferably, the preset angle is 30°.

[0062] S7, using a scraper to scrape away the middle area of ​​each strip at a fixed preset angle; wherein the scraper touches the surface of the porcelain piece when scraping;

[0063] In a preferred embodiment of the present invention, the silicone rubber layer after the thermal insulation test is evenly divided into Figure 3 and Figure 4 The four strips with the dimensions of 20mm x 80mm in length and width shown in the figure are cut to the porcelain part. Then, a spatula with a chisel width of 10mm is used to aim at the middle of the strip and remove the silicone rubber layer at a certain angle (the angle between the spatula and the surface of the test piece is 30°) at a uniform speed. The spatula needs to cut to the surface of the porcelain part. The strip structure after removal is as follows Figure 4 As shown, the gray area is the peripheral area, and the white area in the red frame is the middle area.

[0064] S8, determining whether there is an extended damage area on the coating in the peripheral area where the strip is not removed;

[0065] Preferably, after determining whether there is an extended damage area on the coating of the peripheral area of ​​the strip that has not been removed, the method further includes:

[0066] S81, if yes, calculating the exposed area of ​​the ceramic component on the extended damage area, and the area ratio of the exposed area to the extended damage area;

[0067] S82. When it is confirmed that the area ratio is not greater than a preset first ratio threshold, confirm that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator meets the adhesion requirement.

[0068] S83. When it is confirmed that the area ratio is greater than a preset first ratio threshold, it is confirmed that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator does not meet the adhesion requirement.

[0069] Preferably, after confirming that the area ratio is greater than a preset first ratio threshold, the method further includes:

[0070] S831, when it is confirmed that the area ratio is greater than a first ratio threshold value and is not greater than a preset second ratio threshold value, determining that the unqualified level of adhesion is a first level;

[0071] S832: when it is confirmed that the area ratio is greater than a second ratio threshold and the strip has not fallen off, determining that the unqualified level of adhesion is the second level;

[0072] S833: When it is confirmed that the area ratio is greater than the second ratio threshold and the strip is detached, the unqualified level of the adhesion is determined to be the third level.

[0073] Preferably, the first ratio threshold is 50%, and the second ratio threshold is 80%.

[0074] S9. If not, confirm that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator meets the adhesion requirement.

[0075] In a preferred embodiment of the present invention, in a good lighting environment, check if Figure 2 The bonding state of the coating and the substrate (or primer) shown is observed. Except for the area directly cut by the scraper, observe whether the coating around each stripe (peripheral area) has extended damage. If there is no extended damage or the exposed area of ​​the primer in the extended area (the part of each stripe that is not directly scraped off) is ≤50% (grade 0 to 1), the coating adhesion is judged to meet the technical requirements; if the exposed area of ​​the primer in the extended area is >50% (≥grade 2), the coating adhesion is judged to not meet the technical requirements.

[0076] As shown in the table below, the insulators that were removed after cutting were processed and compared with the preset test result grading table, where level 0 and level 1 determined that the coating adhesion met the technical requirements, while level 2 (the first level), level 3 (the second level) and level 4 (the third level) determined that the hybrid insulator porcelain had a coating adhesion failure.

[0077]

[0078] It can be understood that the test result grading method based on the system evaluation in this embodiment innovatively adopts the strip cutting + scraping determination method for the area where there is a bulge between the hybrid insulator porcelain and the silicone rubber layer, and more accurately determines whether there is a failure in the adhesion between the hybrid insulator porcelain and the silicone rubber layer by checking the bonding state of the porcelain and the silicone rubber layer and comparing it with the test result grading table. The method has simple equipment, convenient operation, and is not affected by the surrounding environment, so it is very suitable for detection during the manufacturing process of hybrid insulators.

[0079] The present embodiment discloses a method for detecting the adhesion of a hybrid insulator, wherein the silicone rubber layer of the hybrid insulator is subjected to a static insulation test, and it is determined whether a bulge appears on the silicone rubber layer; if not, it is confirmed that the adhesion between the porcelain component of the hybrid insulator and the silicone rubber layer meets the adhesion requirements; if so, the bulge is cut; when it is confirmed that the porcelain component is exposed from the cut area of ​​the bulge, it is confirmed that the adhesion between the porcelain component of the hybrid insulator and the silicone rubber layer does not meet the adhesion requirements. During the static insulation test, if the adhesion between the silicone rubber layer and the porcelain component is insufficient, when the silicone rubber layer expands due to heat, bulges will be formed locally because the internal stress cannot be released. Therefore, the present invention can intuitively determine the adhesion between the silicone rubber layer and the porcelain component by observing whether a bulge appears on the silicone rubber layer during the static insulation test.

[0080] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for detecting adhesion of a hybrid insulator, characterized in that: include: Obtain a hybrid insulator to be tested; wherein the hybrid insulator comprises: a porcelain component and a silicone rubber layer wrapped on the surface of the porcelain component; Performing a static heat insulation test on the silicone rubber layer of the hybrid insulator, and determining whether bulging occurs on the silicone rubber layer; If not, confirming that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator meets the preset adhesion requirements; If yes, cutting the bulge; When it is confirmed that the porcelain component is exposed from the cutting area of ​​the bulge, it is confirmed that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator does not meet the adhesion requirement.

2. A method for detecting adhesion of a hybrid insulator according to claim 1, characterized in that: After the bulge is cut, the method further comprises: When it is confirmed that the porcelain component is not exposed from the cutting area of ​​the bulge and the bulge is a bulge generated by the shallow surface layer of the silicone rubber layer, it is confirmed that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator meets the adhesion requirement.

3. A method for detecting adhesion of a hybrid insulator according to claim 2, characterized in that: After the bulge is cut, the method further comprises: When it is confirmed that the porcelain piece is not exposed from the cutting area of ​​the bulge and the bulge is not a bulge generated by the shallow surface layer of the silicone rubber layer, the silicone rubber layer is cut into a plurality of strips of equal size; Using a scraper to scrape away the middle area of ​​each strip at a fixed preset angle; wherein the chisel of the scraper touches the surface of the porcelain piece when scraping; Determining whether there is an extended damage area on the coating in the peripheral area of ​​the strip that has not been removed; If not, it is confirmed that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator meets the adhesion requirement.

4. A method for detecting adhesion of a hybrid insulator according to claim 3, characterized in that: After determining whether there is an extended damage area on the coating of the peripheral area where the strip is not removed, the method further includes: If yes, then calculate the exposed area of ​​the ceramic component on the extended damage area and the area ratio of the exposed area on the extended damage area; When it is confirmed that the area ratio is not greater than a preset first ratio threshold, it is confirmed that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator meets the adhesion requirement; When it is confirmed that the area ratio is greater than a preset first ratio threshold, it is confirmed that the adhesion between the porcelain component and the silicone rubber layer of the hybrid insulator does not meet the adhesion requirement.

5. The method for detecting adhesion of a hybrid insulator according to claim 4, characterized in that: After confirming that the area ratio is greater than a preset first ratio threshold, the method further includes: When it is confirmed that the area ratio is greater than a first ratio threshold value and is not greater than a preset second ratio threshold value, determining that the unqualified level of adhesion is a first level; When it is confirmed that the area ratio is greater than a second ratio threshold and the strip has not fallen off, the unqualified level of the adhesion is determined to be the second level; When it is confirmed that the area ratio is greater than the second ratio threshold and the strip falls off, it is determined that the unqualified level of adhesion is the third level.

6. The adhesion detection method of a hybrid insulator according to claim 1, characterized in that: The step of cutting the bulge comprises: The bulge was cut based on 30% of the thickness of the silicone rubber layer.

7. A method for detecting adhesion of a hybrid insulator according to claim 3, characterized in that: The strip is 20 mm long and 80 mm wide.

8. The method for detecting adhesion of a hybrid insulator according to claim 7, characterized in that: The width of the scraper is 10 mm.

9. A method for detecting adhesion of a hybrid insulator according to claim 8, characterized in that: The preset angle is 30°.

10. The method for detecting adhesion of a hybrid insulator according to claim 5, characterized in that: The first ratio threshold is 50%, and the second ratio threshold is 80%.

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