Device for simulating mechanical strength attenuation test of insulating material at high temperature
By designing a high-temperature mechanical strength attenuation test device for insulating materials based on lever principle and multiple sets of connecting rod structures, the problem of mechanical performance testing at high temperatures was solved. Stable load loading and multiple tests were achieved in high-temperature environments, meeting the requirements for high-temperature mechanical performance verification.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-23
- Publication Date
- 2026-03-31
AI Technical Summary
Existing technologies cannot effectively test the mechanical properties of insulating materials for extended periods at high temperatures, resulting in conventional test data failing to represent the actual performance of materials at high temperatures. Furthermore, large-scale testing equipment cannot apply loads at high temperatures for extended periods.
A test device for simulating the mechanical strength decay of insulating materials under high temperature was designed. Utilizing the lever principle and a multi-group connecting rod structure, a large tensile force is generated by a small weight. Combined with connectors made of Q235A steel and stainless steel, stable loading is achieved in high-temperature environments, making it suitable for equipment in different environments.
It enables stable load testing of insulating materials under high-temperature conditions, simulating changes in the mechanical properties of materials under different environmental conditions. It has a simple structure, low cost, and is suitable for multiple sets of tests, meeting the requirements for high-temperature mechanical performance verification.
Smart Images
Figure CN224066529U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of testing equipment for insulation materials of ultra-high voltage and extra-high voltage transformers, and in particular to a device for simulating the mechanical strength attenuation test of insulation materials under high temperature. Background Technology
[0002] For oil-immersed power transformers, in order to achieve efficient and stable power transmission, the transformer is in a temperature range of 70-105℃ during normal operation. The insulation materials are also exposed to this ambient temperature for a long time. As an E-grade material, the insulating paperboard can maintain its material performance at 120℃. However, for laminated paperboard insulation materials, since there is an adhesive, whether the mechanical strength of the adhesive will change under high temperature environment becomes the most important aspect of material mechanical performance verification.
[0003] With the development of power transformer technology, users have placed higher demands on the operational stability and lifespan of transformers. Transformer designers design transformer structures based on the performance parameters of insulation materials, and ensuring the mechanical properties of these materials under high-temperature environments is a key consideration. Currently, standard testing methods for verifying the mechanical properties of laminated paperboard materials require testing at 23°C. However, the actual operating temperature of laminated paperboard is much higher than 23°C. Therefore, the mechanical performance data obtained from conventional testing cannot fully represent the actual mechanical properties of the material under high-temperature conditions. Furthermore, current mainstream methods for testing the mechanical strength of materials require large-scale testing equipment, such as electronic tensile testing machines, which cannot withstand prolonged high-temperature testing and cannot meet the requirements for long-term load application under high-temperature environments. Therefore, a testing method and device are needed to verify whether mechanical strength changes under high-temperature environments to solve the above problems. Utility Model Content
[0004] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the prior art, this utility model provides a test device for simulating the mechanical strength decay of insulating materials under high temperature, which can apply load to the material for a long time under a specified high temperature environment to verify whether the mechanical properties of the material change under high temperature environment.
[0005] The technical solution adopted by this utility model to solve its technical problem is: a test device for simulating the mechanical strength decay of insulating materials under high temperature, including a base plate, at least two supporting columns on the base plate, and a set of tensile testing components between any two adjacent supporting columns. Each set of tensile testing components includes a weight, a lever, a U-shaped connecting frame, and a support plate. A first connecting rod is provided at the upper end of the supporting column, and the first connecting rod is laterally connected to all the supporting columns. The middle part of the lever is rotatably connected to the first connecting rod, and a weight is suspended at the rear end of the lever. The lever is rotatably connected to the shaft; the other end of the lever is provided with a U-shaped connecting frame with the opening facing downward. The upper end of the U-shaped connecting frame is rotatably connected to the lever through a second connecting rod arranged horizontally. A support plate is provided directly below each U-shaped connecting frame. The bottom of the support plate is fixed to the base plate. The sample to be tested is placed between the U-shaped connecting frame and the support plate. The upper end of the sample to be tested extends into the opening of the U-shaped connecting frame and is rotatably connected to the U-shaped connecting frame through a third connecting rod arranged horizontally. The lower end of the sample to be tested is rotatably connected to the upper end of the support plate through a fourth connecting rod arranged horizontally.
[0006] Specifically, the sample to be tested includes a handle and a fork that are integrally connected. The upper end of the handle is provided with a first through hole, and the lower ends of the fork are provided with second through holes on both sides. The first through hole is connected to a third connecting rod, and the second through hole is connected to a fourth connecting rod.
[0007] Furthermore, based on the lever principle, in order to generate a larger tensile force using a smaller weight, the distance between the second connecting rod and the first connecting rod is smaller than the distance between the rotating shaft and the first connecting rod.
[0008] Furthermore, to accommodate tests with varying tensile forces without requiring weight replacement, the lever is provided with multiple connecting holes along its axial direction. When the first connecting rod is connected to different connecting holes, it can provide different tensile forces, eliminating the need for different sized weights and saving on testing equipment costs.
[0009] Furthermore, to meet the requirements of high-temperature testing, the base plate, lever, support column, support plate, and U-shaped connecting frame are made of Q235A steel and blackened. The first connecting rod, second connecting rod, third connecting rod, fourth connecting rod, and rotating shaft are made of stainless steel. The weights can be standard weights or made of stainless steel.
[0010] The beneficial effects of this utility model are:
[0011] 1. This device can apply a stable load to the sample through a mechanical mechanism, and can continue to apply a stable load even in high-temperature environments, simulating the mechanical properties of materials under high-temperature conditions for comparative testing;
[0012] 2. This device can be used with different environmental equipment, such as constant temperature and humidity chambers and salt spray test chambers, to simulate different environmental conditions and test the mechanical property stability of materials;
[0013] 3. This device has a simple structure, low manufacturing cost, and low requirements for the supporting equipment. It can be flexibly combined and multiple groups can conduct experiments simultaneously for comparative verification. Attached Figure Description
[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0015] Figure 1 This is a schematic diagram of the structure of the insulating material sample of this utility model.
[0016] Figure 2 This is a schematic diagram of the structure of the insulating material sample of this utility model.
[0017] Figure 3 This is a schematic diagram of the structure of Embodiment 1 of the mechanical strength attenuation test device of this utility model.
[0018] Figure 4 This is a schematic diagram of the structure of Embodiment 1 of the mechanical strength attenuation test device of this utility model.
[0019] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the mechanical strength attenuation test device of this utility model.
[0020] In the diagram: 1. Weight, 2. Lever, 21. Connecting hole, 3. Base plate, 4. Support column, 5. Support plate, 6. Sample to be tested, 61. Handle, 62. Fork, 63. First through hole, 64. Second through hole, 7. U-shaped connecting frame, 8. First connecting rod, 9. Second connecting rod, 10. Third connecting rod, 11. Fourth connecting rod, 12. Rotating shaft. Detailed Implementation
[0021] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and 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 of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.
[0024] To test the insulating material, a test sample 6 of the insulating material needs to be prepared. In this embodiment, the structure of the insulating material sample is as follows: Figure 1 and Figure 2 As shown, the sample 6 to be tested is made of insulating paperboard laminate and has a three-dimensional Y-shaped structure, including a handle 61 and a fork 62 connected in one piece. The upper end of the handle 61 is provided with a first through hole 63, and the lower ends of the fork 62 are provided with second through holes 64 on both sides. The first through hole 63 and the second through hole 64 are used to connect with the test device.
[0025] Example 1:
[0026] like Figure 3 and Figure 4As shown, this utility model discloses a device for simulating the mechanical strength attenuation of insulating materials under high temperature. It includes a base plate 3, on which at least two supporting columns 4 are mounted. A set of tensile testing components is provided between any two adjacent supporting columns 4. Each set of tensile testing components includes a weight 1, a lever 2, a U-shaped connecting frame 7, and a supporting plate 5. A first connecting rod 8 is provided at the upper end of each supporting column 4, and the first connecting rod 8 is laterally connected to all supporting columns 4. The middle part of the lever 2 is rotatably connected to the first connecting rod 8. A weight 1 is suspended at the rear end of the lever 2, and the upper end of the weight 1 is rotatably connected to a pivot 12. On lever 2; the other end of lever 2 is provided with a U-shaped connecting frame 7 with its opening facing downwards. The upper end of the U-shaped connecting frame 7 is rotatably connected to lever 2 via a horizontally arranged second connecting rod 9. A support plate 5 is provided directly below each U-shaped connecting frame 7. The bottom of the support plate 5 is fixed to the base plate 3. The sample to be tested 6 is placed between the U-shaped connecting frame 7 and the support plate 5. The upper end of the sample to be tested 6 extends into the opening of the U-shaped connecting frame 7 and is rotatably connected to the U-shaped connecting frame 7 via a horizontally arranged third connecting rod 10. The lower end of the sample to be tested 6 is rotatably connected to the upper end of the support plate 5 via a horizontally arranged fourth connecting rod 11. Based on the principle of lever 2, in order to generate a relatively large tensile force using a smaller weight 1, the distance between the second connecting rod 9 and the first connecting rod 8 is smaller than the distance between the rotating shaft 12 and the first connecting rod 8. To meet the requirements of high-temperature testing, the base plate 3, lever 2, support column 4, support plate 5, and U-shaped connecting frame 7 are made of Q235A steel with a black finish. The first connecting rod 8, second connecting rod 9, third connecting rod 10, fourth connecting rod 11, and rotating shaft 12 are made of stainless steel. The weight 1 can be a standard weight or made of stainless steel. In this embodiment, there are four support columns 4, thus forming three intervals. Each interval contains a set of tensile testing components. The first connecting rod 8, second connecting rod 9, third connecting rod 10, and fourth connecting rod 11 are all single pieces, running laterally through all tensile testing components.
[0027] Example 2:
[0028] like Figure 5 As shown, the difference between this embodiment and the first embodiment is that the lever 2 is provided with multiple connecting holes 21 along the axial direction. When the first connecting rod 8 is connected in different connecting holes 21, it can provide different tensile forces, thus avoiding the need to equip with weights 1 of different specifications.
[0029] Figures 3-5 The component marked in red is sample 6 to be tested.
[0030] Working principle:
[0031] This testing device can be used to detect the decrease in mechanical strength of laminated cardboard insulation materials used inside oil-immersed transformers under mixing conditions.
[0032] Make initial marks on the surface of sample 6, and place sample 6 according to... Figure 3 and Figure 4 The sample 6 is mounted on the test apparatus and a load is continuously and stably applied. Then, the test apparatus and the sample are placed in a drying oven and heated to test whether the mechanical properties of the sample will change at high temperature.
[0033] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the scope of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. An apparatus for simulating mechanical strength degradation test of an insulation material at high temperature, characterized by: The application relates to a tensile testing device, which comprises a bottom plate, at least two supporting columns arranged on the bottom plate, a group of tensile testing components arranged between any two adjacent supporting columns, a weight, a lever, a U-shaped connecting frame and a supporting plate, a first connecting rod arranged at the upper end of the supporting column, the first connecting rod being horizontally connected to all the supporting columns, the middle part of the lever being rotatably connected to the first connecting rod, the rear end of the lever being provided with the weight hung thereon, the upper end of the weight being rotatably connected to the lever through a rotating shaft, the other end of the lever being provided with the U-shaped connecting frame with the opening downward, the upper end of the U-shaped connecting frame being rotatably connected to the lever through a horizontally arranged second connecting rod, one supporting plate being arranged below each U-shaped connecting frame, the bottom of the supporting plate being fixed to the bottom plate, a sample to be tested being arranged between the U-shaped connecting frame and the supporting plate, the upper end of the sample to be tested being inserted into the opening of the U-shaped connecting frame, the sample to be tested being rotatably connected to the U-shaped connecting frame through a horizontally arranged third connecting rod, and the lower end of the sample to be tested being rotatably connected to the upper end of the supporting plate through a horizontally arranged fourth connecting rod.
2. The apparatus for testing the mechanical strength decay of an insulation material at high temperature according to claim 1, wherein: The sample to be tested comprises a handle and a fork which are integrally connected, the upper end of the handle is provided with a first through hole, the lower end of the fork is provided with a second through hole at both sides, the first through hole is connected to the third connecting rod, and the second through hole is connected to the fourth connecting rod.
3. The apparatus for testing the mechanical strength decay of an insulation material at high temperature according to claim 1, wherein: The distance between the second connecting rod and the first connecting rod is smaller than the distance between the rotating shaft and the first connecting rod.
4. The apparatus for testing the mechanical strength decay of an insulation material at high temperatures according to claim 1, wherein: A plurality of connecting holes are arranged on the lever in the axial direction.
5. The apparatus for testing the mechanical strength decay of an insulation material at high temperatures according to claim 1, wherein: The bottom plate, the lever, the supporting column, the supporting plate and the U-shaped connecting frame are made of Q235A steel and are blackened, the first connecting rod, the second connecting rod, the third connecting rod, the fourth connecting rod and the rotating shaft are made of stainless steel, and the weight is made of a standard weight or stainless steel.