Structure for detecting bonding strength of paint film on enameled wire coil
By torturing and impregnating the enameled wire coils and testing the adhesion strength of the varnish film, the problem of short-circuit failure of water-based varnish in motor cells was solved, enabling early judgment and applicability testing, and reducing the failure risk of motor cells.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2026-03-06
AI Technical Summary
When using water-based paint to impregnate enameled wire coils, existing technology cannot effectively detect the adhesion strength of the paint film, leading to the risk of short circuit failure of the coil in the motor core, especially in the case of small-diameter enameled wires, where poor impregnation is difficult to detect in time.
By winding enameled wire into a loop and twisting it into a test coil with twisted segments and coil segments, the winding method of motor battery cells is simulated. The coil is then immersed in water-based paint and baked to test the adhesion strength of the paint film. Water-based paint is used only after ensuring that the requirements are met.
This technology enables early detection of the adhesion strength of the enamel film in enameled wire coils, reduces the risk of short-circuit failure of coils in motor cells, and ensures the applicability of water-based varnishes, especially for small-diameter enameled wires.
Smart Images
Figure CN223977085U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motor cell manufacturing technology, specifically to a structure for detecting the adhesion strength of the enamel film on enameled wire coils. Background Technology
[0002] In the production of products such as electric motor cells, the impregnation process after the motor coil is completed is a common processing technique. After impregnation, the motor coil is baked to fix the coil shape and prevent it from loosening during operation. It also further improves the insulation performance of the varnish film. If the coil does not have sufficient bonding strength after impregnation, the coil will become loose. This will not only deform the electromagnetic field and reduce the efficiency of the motor, but may also cause the coil to be thrown out during operation and short-circuit failure during intermittent operation.
[0003] Generally, oil-based varnish is used for impregnating motor coils. Oil-based varnish is not affected by the slipperiness of the enameled wire surface, making it easier to bond the enameled wire coils. However, with the development of technology and environmental protection requirements, oil-based varnish is now required to be replaced with water-based varnish to meet environmental emission standards due to excessive fugitive emissions after baking.
[0004] However, the following problems were found in the actual application of water-based paint in the production of motor cells:
[0005] Because a slippery coating or a good lubricant is used on the surface of the enameled wire, the enamel cannot properly wet the surface of the enamel film during winding and winding. The lubricant may also seep into the coil and fail to adhere completely to the enameled wire, resulting in insufficient enamel strength and reduced adhesion between the enamel film and the wire enamel film. Furthermore, different water-based enamels have different bonding strengths, necessitating the selection of suitable water-based enamels.
[0006] Especially when using enameled wire with a smaller diameter (0.10-0.50mm), the reduced contact area between the wires leads to poor impregnation of the water-based enamel, making it difficult to detect problems in time and affecting the coil's strength requirements. Current technology cannot directly assess the bonding strength of the enameled wire in the motor core, resulting in problems being discovered only after production and causing a high rate of scrapped motor cores. Summary of the Invention
[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a structure for detecting the adhesion strength of the enamel film on the enameled wire coil. This structure can determine the adhesion strength of the enamel film on the enameled wire in advance, thereby determining whether the enameled wire used is suitable for water-based enamel, effectively reducing the risk of short-circuit failure of the coil in the motor core.
[0008] To achieve the above objectives, this utility model provides the following technical solution:
[0009] A structure is provided for detecting the adhesion strength of the enamel film on an enameled wire coil, comprising an enameled wire to be tested, the enameled wire being wound into a plurality of coils;
[0010] The coils are stacked to form a coil pattern, which is then twisted into a test coil having a twisted segment and a coil segment. The twisted segment is composed of several strands of enameled wire twisted together, and the coil segment is composed of several stacked enameled wire coils.
[0011] The test coil is coated with water-based paint, and the bonding strength between the water-based paint and the test coil is the same as the bonding strength of the paint film on the enameled wire coil.
[0012] The enameled wire is made into a loop, and then the loop is twisted to divide the loop into a test coil with twisted segments and coil segments. The twisted segments are composed of several twisted enameled wire segments, and the coil segments are composed of several enameled wire coils stacked in alignment.
[0013] The sample consists of multiple coils wound together. The sample is then partially twisted to create a twisted segment and a coil segment. These twisted and coil segments represent the actual winding method in the motor. The resulting coil is used as a test coil.
[0014] The test coil is immersed in water-based paint, then removed and baked, followed by cooling. The paint film adhesion strength of the test coil is then tested. If the paint film adhesion strength meets the requirements, the test coil can be immersed in water-based paint; otherwise, it cannot be used.
[0015] The obtained test coil is immersed in water-based paint for impregnation treatment to simulate the impregnation treatment of motor cell. After baking, the water-based paint can be cured and then fully cooled. The adhesion strength of the paint film can be tested. When the paint film strength meets the requirements, water-based paint can be used for impregnation, thereby effectively reducing the risk of short circuit failure of the coil in the motor cell.
[0016] In some embodiments, the central portion of the coil is twisted to form a figure-eight test coil, wherein the central portion of the test coil is the twisted segment, and the two sides of the test coil are the coil segments.
[0017] The coil is made into a figure-eight shape, allowing for two coil segments for easy hand twisting. Specifically, the coil is twisted 2.5 times from the middle, then turned back half a turn to obtain an 8-byte sample. At least five test coils must be made to ensure the validity and accuracy of the test data. The completed samples are labeled and recorded in a table.
[0018] In some embodiments, the enameled wire has a diameter of 0.10 mm to 0.50 mm.
[0019] Smaller diameter enameled wires have a smaller contact area with water-based paints, and this structure can better detect whether enameled wires with small contact areas are suitable for water-based paints.
[0020] In some embodiments, the enameled wire is characterized by being wound into 40 coils for every 10 meters of length.
[0021] This amplitude allows for the production of coils of suitable size.
[0022] In some embodiments, the loop is characterized by being twisted into at least six twisted segments.
[0023] The twisting line segment of this number of shares can guarantee the test results.
[0024] In some embodiments, the coil is twisted into at least 20 turns of the coil segment.
[0025] This number of coil turns ensures the test results.
[0026] The beneficial effects of this utility model on the structure for testing the adhesion strength of the enamel film on enameled wire coils are as follows:
[0027] (1) The structure of this utility model for detecting the bonding strength of the enamel film on the enameled wire coil. This utility model makes a test coil with a twisted wire segment and a coil segment from the enameled wire to be made into a coil. The test coil can simultaneously imitate the winding method of the enameled wire on the motor core, which is convenient to reflect the bonding strength of the enamel film of the enameled wire in a real way. Then the test coil includes water-based paint. Since the test coil only has a coil body, it is convenient to intuitively detect the bonding strength between the coil and the enamel film, so as to quickly predict whether the enameled wire is suitable for using water-based paint and reduce the risk of short circuit failure of the coil in the motor core.
[0028] (2) The structure of this utility model for testing the bonding strength of the enamel film on the enameled wire coil can better determine whether small-diameter enameled wire is suitable for water-based paint impregnation, and through the test results, confirm which water-based paint is suitable for the enameled wire, thereby replacing oil-based paint. Attached Figure Description
[0029] Figure 1 This is a schematic flowchart of a structure for detecting the adhesion strength of the enamel film on an enameled wire coil, according to an embodiment of this utility model.
[0030] Figure 2 This is a schematic diagram of the structure of the test coil according to an embodiment of the present invention.
[0031] Figure label:
[0032] 1. Twisted line segment; 2. Coil segment Detailed Implementation
[0033] Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.
[0034] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.
[0035] It should be understood that although the terms "first," "second," "third," etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0036] Example 1
[0037] The structure disclosed in this embodiment for detecting the adhesion strength of the enamel film on enameled wire coils, such as Figure 2 As shown, it includes an enameled wire to be tested, which is wound into several coils;
[0038] The coils are stacked to form a coil pattern, which is then twisted into a test coil having a twisted segment 1 and a coil segment 2. The twisted segment 1 is composed of several strands of enameled wire twisted together, and the coil segment 2 is composed of several stacked enameled wire coils.
[0039] The test coil is coated with water-based paint, and the bonding strength between the water-based paint and the test coil is the same as the bonding strength of the paint film on the enameled wire coil.
[0040] The enameled wire is made into a loop, and then the loop is twisted to divide the loop into a test coil with a twisted segment 1 and a coil segment 2. The twisted segment 1 is composed of several twisted enameled wire segments, and the coil segment 2 is composed of several enameled wire coils stacked in alignment.
[0041] The coil is composed of multiple coils wound together. Then, the coil is partially twisted to create a twisted segment and a coil segment 2. The twisted segment and coil segment 2 represent the actual winding method in the motor. The coil obtained after twisting is used as a test coil.
[0042] The test coil is immersed in water-based paint, then removed and baked, followed by cooling. The paint film adhesion strength of the test coil is then tested. If the paint film adhesion strength meets the requirements, the test coil can be immersed in water-based paint; otherwise, it cannot be used.
[0043] The obtained test coil is immersed in water-based paint for impregnation treatment to simulate the impregnation treatment of motor cell. After baking, the water-based paint can be cured and then fully cooled. The adhesion strength of the paint film can be tested. When the paint film strength meets the requirements, water-based paint can be used for impregnation, thereby effectively reducing the risk of short circuit failure of the coil in the motor cell.
[0044] In this embodiment, the middle part of the coil is twisted to form a figure-eight test coil, the middle part of the test coil is the twisted line segment 1, and the two sides of the test coil are the coil segments 2.
[0045] The coil is made into a figure-eight shape, allowing for two coil segments 2, which are easy to twist by hand. Specifically, the coil is twisted 2.5 times from the middle, and then turned back half a turn to obtain a sample of segment 8. The above steps are repeated to make at least 5 test coils for testing, ensuring the validity and accuracy of the experimental data. The completed samples are labeled and recorded in a table.
[0046] In this embodiment, the diameter of the enameled wire is 0.10mm~0.50mm.
[0047] Smaller diameter enameled wires have a smaller contact area with water-based paints, and this structure can better detect whether enameled wires with small contact areas are suitable for water-based paints.
[0048] In this embodiment, every 10 meters of enameled wire is wound into 40 coils.
[0049] This amplitude allows for the production of coils of suitable size.
[0050] In this embodiment, the loop is twisted into at least 6 twisted line segments 1.
[0051] The twisting segment 1 of this stock can guarantee the test results.
[0052] In this embodiment, the coil is twisted into at least 20 turns of the coil segment 2.
[0053] The number of coil turns in segment 2 ensures the test results.
[0054] Example 2
[0055] This embodiment discloses a structure for detecting the adhesion strength of the enamel film on enameled wire coils, such as... Figures 1-2 As shown, it includes the following steps:
[0056] Obtain the enameled wire for the motor coil to be manufactured, and calculate the number of coils that need to be manufactured using the enameled wire;
[0057] To accurately match the application environment, the number of coils to be manufactured is calculated based on the characteristics of the motor and enameled wire used in the actual application.
[0058] The enameled wire is made into a loop, and then the loop is twisted to divide the loop into a test coil with a twisted segment 1 and a coil segment 2. The twisted segment 1 is composed of several twisted enameled wire segments, and the coil segment 2 is composed of several enameled wire coils stacked in alignment.
[0059] Based on the number of coils obtained above, the number of coils is made into a coil pattern, which consists of multiple coils wound together. Then, the coil pattern is partially twisted to produce a twisted segment and a coil segment 2. The twisted segment and coil segment 2 can represent the actual winding method in the motor. The coil obtained after twisting is used as a test coil.
[0060] The test coil is immersed in water-based paint, then removed and baked, followed by cooling. The paint film adhesion strength of the test coil is then tested. If the paint film adhesion strength meets the requirements, the test coil can be immersed in water-based paint; otherwise, it cannot be used.
[0061] The obtained test coil is immersed in water-based paint for impregnation treatment to simulate the impregnation treatment of motor cell. After baking, the water-based paint can be cured and then fully cooled. The adhesion strength of the paint film can be tested. When the paint film strength meets the requirements, water-based paint can be used for impregnation, thereby effectively reducing the risk of short circuit failure of the coil in the motor cell.
[0062] Specifically,
[0063] In this embodiment, the number of coils required to be made from the enameled wire is calculated using the following formula:
[0064] In the above formula,
[0065] d is the diameter of the enameled wire;
[0066] N is the number of coils.
[0067] The larger the diameter, the fewer turns are required. Different wire diameters have different requirements for adhesion, and the larger the wire diameter, the higher the requirement for adhesion.
[0068] In this embodiment, the step of twisting the circular pattern includes:
[0069] Twist the coil several times from the middle position to form a figure-eight shaped test coil. The middle part of the test coil is the twisted segment 1, and the two sides of the test coil are the coil segments 2.
[0070] The coil is made into a figure-eight shape, allowing for two coil segments 2, which are easy to twist by hand. Specifically, the coil is twisted 2.5 times from the middle, and then turned back half a turn to obtain a sample of segment 8. The above steps are repeated to make at least 5 test coils for testing, ensuring the validity and accuracy of the experimental data. The completed samples are labeled and recorded in a table.
[0071] In this embodiment, the coil pattern is prepared using an intelligent high-pressure paint film continuity tester. This intelligent high-pressure paint film continuity tester is an existing instrument; generally, every 10 meters of coil pattern is equivalent to approximately 40 turns of coil.
[0072] In this embodiment, the water-based paint is prepared by mixing water-soluble insulating impregnating varnish and water, and the weight ratio of the water-soluble insulating impregnating varnish to water is 1:1.5.
[0073] The water added to the water-soluble insulating impregnating varnish will be evaporated during subsequent baking. The water is only used to control the viscosity and adhesion of the solvent, control the impregnation time of the enameled wire, and ensure the validity of the test.
[0074] Because water-based paints have a strong odor and are highly volatile, respirators and rubber gloves must be worn at all times during chemical experiments to prevent direct contact with chemical liquids.
[0075] In this embodiment, the test coil is immersed in water-based paint for 250 seconds.
[0076] This impregnation time ensures that the test coil can be properly impregnated.
[0077] In this embodiment, the temperature for baking the test coil is 200°C and the baking time is 60 minutes.
[0078] The baking temperature and time can efficiently cure the paint film without affecting its strength.
[0079] In this embodiment, the cooling time for the test coil is 10 minutes.
[0080] This time allows the paint film to cool completely.
[0081] In this embodiment, the coating adhesion strength of the test coil is detected by the following method: recording the weight of the test coil before varnishing as M1, recording the weight of the test coil after varnishing, baking and cooling as M2, calculating the coating weight ΔM = M2 - M1, and judging the coating adhesion strength based on the coating weight, wherein the greater the coating weight, the greater the coating adhesion strength.
[0082] By recording the weight of the coil before impregnation and then the weight of the coil after impregnation, the corresponding varnish weight can be obtained by subtracting the two. The greater the varnish weight, the more varnish is bonded to the coil, indicating a stronger varnish adhesion.
[0083] In this embodiment, the paint film bonding strength of the test coil is also detected by the following method: twisting the test coil in the opposite direction to the twisting direction when making the coil sample, and observing the looseness of the test coil. If the coil does not loosen, the paint film bonding strength meets the production requirements; otherwise, it does not.
[0084] By twisting in the opposite direction, the adhesion strength of the paint film can be observed. If the adhesion strength of the paint film is insufficient, twisting in the opposite direction will cause it to loosen. If the adhesion strength of the paint film is sufficient, twisting in the opposite direction will not have any effect, and the sample will not loosen. Example
[0085] This embodiment discloses a structure for detecting the adhesion strength of the enamel film on enameled wire coils, such as... Figures 1-2 As shown, it includes the following steps:
[0086] Obtain the enameled wire for the motor coil to be manufactured, and calculate the number of coils that need to be manufactured using the enameled wire;
[0087] To accurately match the application environment, the number of coils to be manufactured is calculated based on the characteristics of the motor and enameled wire used in the actual application.
[0088] The enameled wire is made into a loop, and then the loop is twisted to divide the loop into a test coil with a twisted segment 1 and a coil segment 2. The twisted segment 1 is composed of several twisted enameled wire segments, and the coil segment 2 is composed of several enameled wire coils stacked in alignment.
[0089] Based on the number of coils obtained above, the number of coils is made into a coil pattern, which consists of multiple coils wound together. Then, the coil pattern is partially twisted to produce a twisted segment and a coil segment 2. The twisted segment and coil segment 2 can represent the actual winding method in the motor. The coil obtained after twisting is used as a test coil.
[0090] The test coil is immersed in water-based paint, then removed and baked, followed by cooling. The paint film adhesion strength of the test coil is then tested. If the paint film adhesion strength meets the requirements, the test coil can be immersed in water-based paint; otherwise, it cannot be used.
[0091] The obtained test coil is immersed in water-based paint for impregnation treatment to simulate the impregnation treatment of motor cell. After baking, the water-based paint can be cured and then fully cooled. The adhesion strength of the paint film can be tested. When the paint film strength meets the requirements, water-based paint can be used for impregnation, thereby effectively reducing the risk of short circuit failure of the coil in the motor cell.
[0092] Specifically,
[0093] In this embodiment, the number of coils required to be made from the enameled wire is calculated using the following formula:
[0094] In the above formula,
[0095] d is the diameter of the enameled wire;
[0096] N is the number of coils.
[0097] The larger the diameter, the fewer turns are required. Different wire diameters have different requirements for adhesion, and the larger the wire diameter, the higher the requirement for adhesion.
[0098] In this embodiment, the step of twisting the circular pattern includes:
[0099] Twist the coil several times from the middle position to form a figure-eight shaped test coil. The middle part of the test coil is the twisted segment 1, and the two sides of the test coil are the coil segments 2.
[0100] The coil is made into a figure-eight shape, allowing for two coil segments 2, which are easy to twist by hand. Specifically, the coil is twisted 2.5 times from the middle, and then turned back half a turn to obtain a sample of segment 8. The above steps are repeated to make at least 5 test coils for testing, ensuring the validity and accuracy of the experimental data. The completed samples are labeled and recorded in a table.
[0101] In this embodiment, the coil pattern is prepared using an intelligent high-pressure paint film continuity tester. This intelligent high-pressure paint film continuity tester is an existing instrument; generally, every 10 meters of coil pattern is equivalent to approximately 40 turns of coil.
[0102] In this embodiment, the water-based paint is prepared by mixing water-soluble insulating impregnating varnish and water, and the weight ratio of the water-soluble insulating impregnating varnish to water is 1:2.
[0103] The water added to the water-soluble insulating impregnating varnish will be evaporated during subsequent baking. The water is only used to control the viscosity and adhesion of the solvent, control the impregnation time of the enameled wire, and ensure the validity of the test.
[0104] Because water-based paints have a strong odor and are highly volatile, respirators and rubber gloves must be worn at all times during chemical experiments to prevent direct contact with chemical liquids.
[0105] In this embodiment, the test coil is immersed in water-based paint for 300 seconds.
[0106] This impregnation time ensures that the test coil can be properly impregnated.
[0107] In this embodiment, the temperature for baking the test coil is 210°C and the baking time is 70 minutes.
[0108] The baking temperature and time can efficiently cure the paint film without affecting its strength.
[0109] In this embodiment, the cooling time for the test coil is 15 minutes.
[0110] This time allows the paint film to cool completely.
[0111] In this embodiment, the coating adhesion strength of the test coil is detected by the following method: recording the weight of the test coil before varnishing as M1, recording the weight of the test coil after varnishing, baking and cooling as M2, calculating the coating weight ΔM = M2 - M1, and judging the coating adhesion strength based on the coating weight, wherein the greater the coating weight, the greater the coating adhesion strength.
[0112] By recording the weight of the coil before impregnation and then the weight of the coil after impregnation, the corresponding varnish weight can be obtained by subtracting the two. The greater the varnish weight, the more varnish is bonded to the coil, indicating a stronger varnish adhesion.
[0113] In this embodiment, the paint film bonding strength of the test coil is also detected by the following method: twisting the test coil in the opposite direction to the twisting direction when making the coil sample, and observing the looseness of the test coil. If the coil does not loosen, the paint film bonding strength meets the production requirements; otherwise, it does not.
[0114] By twisting in the opposite direction, the adhesion strength of the paint film can be observed. If the adhesion strength of the paint film is insufficient, twisting in the opposite direction will cause it to loosen. If the adhesion strength of the paint film is insufficient, twisting in the opposite direction will not have any effect, and the sample will not loosen.
[0115] Example 4
[0116] This embodiment discloses a structure for detecting the adhesion strength of the enamel film on enameled wire coils, such as... Figures 1-2 As shown, it includes the following steps:
[0117] Obtain the enameled wire for the motor coil to be manufactured, and calculate the number of coils that need to be manufactured using the enameled wire;
[0118] To accurately match the application environment, the number of coils to be manufactured is calculated based on the characteristics of the motor and enameled wire used in the actual application.
[0119] The enameled wire is made into a loop, and then the loop is twisted to divide the loop into a test coil with a twisted segment 1 and a coil segment 2. The twisted segment 1 is composed of several twisted enameled wire segments, and the coil segment 2 is composed of several enameled wire coils stacked in alignment.
[0120] Based on the number of coils obtained above, the number of coils is made into a coil pattern, which consists of multiple coils wound together. Then, the coil pattern is partially twisted to produce a twisted segment and a coil segment 2. The twisted segment and coil segment 2 can represent the actual winding method in the motor. The coil obtained after twisting is used as a test coil.
[0121] The test coil is immersed in water-based paint, then removed and baked, followed by cooling. The paint film adhesion strength of the test coil is then tested. If the paint film adhesion strength meets the requirements, the test coil can be immersed in water-based paint; otherwise, it cannot be used.
[0122] The obtained test coil is immersed in water-based paint for impregnation treatment to simulate the impregnation treatment of motor cell. After baking, the water-based paint can be cured and then fully cooled. The adhesion strength of the paint film can be tested. When the paint film strength meets the requirements, water-based paint can be used for impregnation, thereby effectively reducing the risk of short circuit failure of the coil in the motor cell.
[0123] Specifically,
[0124] In this embodiment, the number of coils required to be made from the enameled wire is calculated using the following formula:
[0125] In the above formula,
[0126] d is the diameter of the enameled wire;
[0127] N is the number of coils.
[0128] The larger the diameter, the fewer turns are required. Different wire diameters have different requirements for adhesion, and the larger the wire diameter, the higher the requirement for adhesion.
[0129] In this embodiment, the step of twisting the circular pattern includes:
[0130] Twist the coil several times from the middle position to form a figure-eight shaped test coil. The middle part of the test coil is the twisted segment 1, and the two sides of the test coil are the coil segments 2.
[0131] The coil is made into a figure-eight shape, allowing for two coil segments 2, which are easy to twist by hand. Specifically, the coil is twisted 2.5 times from the middle, and then turned back half a turn to obtain a sample of segment 8. The above steps are repeated to make at least 5 test coils for testing, ensuring the validity and accuracy of the experimental data. The completed samples are labeled and recorded in a table.
[0132] In this embodiment, the coil pattern is prepared using an intelligent high-pressure paint film continuity tester. This intelligent high-pressure paint film continuity tester is an existing instrument; generally, every 10 meters of coil pattern is equivalent to approximately 40 turns of coil.
[0133] In this embodiment, the water-based paint is prepared by mixing water-soluble insulating impregnating varnish and water, and the weight ratio of the water-soluble insulating impregnating varnish to water is 1:1.2.
[0134] The water added to the water-soluble insulating impregnating varnish will be evaporated during subsequent baking. The water is only used to control the viscosity and adhesion of the solvent, control the impregnation time of the enameled wire, and ensure the validity of the test.
[0135] Because water-based paints have a strong odor and are highly volatile, respirators and rubber gloves must be worn at all times during chemical experiments to prevent direct contact with chemical liquids.
[0136] In this embodiment, the test coil is immersed in water-based paint for 200 seconds.
[0137] This impregnation time ensures that the test coil can be properly impregnated.
[0138] In this embodiment, the temperature for baking the test coil is 150°C and the baking time is 50 minutes.
[0139] The baking temperature and time can efficiently cure the paint film without affecting its strength.
[0140] In this embodiment, the cooling time for the test coil is 8 minutes.
[0141] This time allows the paint film to cool completely.
[0142] In this embodiment, the coating adhesion strength of the test coil is detected by the following method: recording the weight of the test coil before varnishing as M1, recording the weight of the test coil after varnishing, baking and cooling as M2, calculating the coating weight ΔM = M2 - M1, and judging the coating adhesion strength based on the coating weight, wherein the greater the coating weight, the greater the coating adhesion strength.
[0143] By recording the weight of the coil before impregnation and then the weight of the coil after impregnation, the corresponding varnish weight can be obtained by subtracting the two. The greater the varnish weight, the more varnish is bonded to the coil, indicating a stronger varnish adhesion.
[0144] In this embodiment, the paint film bonding strength of the test coil is also detected by the following method: twisting the test coil in the opposite direction to the twisting direction when making the coil sample, and observing the looseness of the test coil. If the coil does not loosen, the paint film bonding strength meets the production requirements; otherwise, it does not.
[0145] By twisting in the opposite direction, the adhesion strength of the paint film can be observed. If the adhesion strength of the paint film is insufficient, twisting in the opposite direction will cause it to loosen. If the adhesion strength of the paint film is insufficient, twisting in the opposite direction will not have any effect, and the sample will not loosen.
[0146] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0147] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0148] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.
[0149] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.
[0150] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A structure for detecting the adhesion strength of a paint film on an enameled wire coil, characterized by, The enameled wire to be detected is wound into several coils; The several coils are stacked to form a coil sample, and the coil sample is twisted into a test coil having twisted wire segments and coil segments, the twisted wire segments being twisted from several strands of enameled wire segments, and the coil segments being stacked from several enameled wire coils. The test coil is coated with a water-based enamel, and the bonding strength between the water-based enamel and the test coil is the bonding strength of the enamel film on the enameled wire coil.
2. The structure for detecting the adhesion strength of the enamel film on the enameled wire coil according to claim 1, characterized by, The middle part of the coil sample is twisted and forms an 8-shaped test coil, the middle part of the test coil being the twisted wire segments, and the two sides of the test coil being the coil segments.
3. The structure for detecting the adhesion strength of the enamel film on the enameled wire coil according to claim 1, characterized by, The diameter of the enameled wire is 0.10mm-0.50mm.
4. The structure for detecting the adhesion strength of the enamel film on the enameled wire coil according to claim 1, characterized by Each 10-meter length of enameled wire is wound into 40 coils.
5. The structure for detecting the adhesion strength of the enamel film on the enameled wire coil according to claim 1, characterized by The coil sample is twisted into at least 6 twisted wire segments.
6. The structure for detecting the adhesion strength of the enamel film on the enameled wire coil according to claim 1, characterized by The coil sample is twisted into at least 20 coil segments.