A device and method for testing the heat insulation performance of a coating

Abstract

The present invention discloses a coating heat insulation performance testing device and method. The testing device includes: a box body having an accommodation cavity; a heating component installed in the accommodation cavity; an asbestos board disposed above the heating component. The asbestos board is provided with a placement hole for placing a specimen to be tested, and a placement platform is provided at the bottom of the placement hole. A first temperature measurement structure is installed at the center of the placement platform; a limiting component is disposed above the asbestos board. The limiting component includes a lifting structure, a clamping structure, and a second temperature measurement structure. The clamping structure and the second temperature measurement structure are connected to the movable end of the lifting structure. The clamping structure is used for clamping the specimen to be tested and placing it on the placement platform; a temperature acquisition device is electrically connected to the first temperature measurement structure and the second temperature measurement structure. According to the coating heat insulation performance testing device of the embodiment of the present invention, the degree of automation is high, and the efficiency and accuracy of the test can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of testing devices, and particularly relates to a testing device and method for the heat insulation performance of a coating. Background Art

[0002] At present, the blade materials of gas turbines for power stations or large civil aircraft engines mostly adopt nickel-based superalloys. Although the alloys have good high-temperature mechanical properties, their high-temperature corrosion resistance is still not ideal, and they are expensive, and the cost of replacing the blades is relatively high. Therefore, a thermal barrier coating is usually sprayed on the surface of the parts to isolate the direct action of high-temperature gas on the parts, protect the heated matrix material, delay heat conduction, and thus enable the parts to serve for a long time, safely and stably in a high-temperature environment.

[0003] The heat insulation of the coating is an important performance index for evaluating the performance of the thermal barrier coating. The size of the heat insulation effect is directly related to the working temperature of the coating system of the parts, and indirectly affects the size of the thermal stress generated during the thermal cycle of the coating. At present, the main method for measuring the heat insulation performance of the thermal barrier coating is the flame jet method. The flame jet method uses an oxyacetylene flame to heat the surface of the sample coated with the thermal barrier coating, and then uses thermocouples to measure the temperature values on the front and back surfaces of the sample respectively. The temperature difference between the front and back surfaces of the measured sample is the heat insulation temperature. The disadvantage of this method is that there is no reference sample, and the heating time is short, and the time required for the temperature on the front and back surfaces of the sample to reach stability is short, resulting in low accuracy of the measured heat insulation temperature of the thermal barrier coating. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a testing device and method for the heat insulation performance of a coating, which is convenient for setting a comparison sample and improving the accuracy of measuring the heat insulation temperature of the thermal barrier coating.

[0005] According to a coating heat insulation performance testing device of the first aspect embodiment of the present invention, it includes:

[0006] A box body having an accommodation cavity;

[0007] A heating component installed in the accommodation cavity;

[0008] An asbestos board installed in the accommodation cavity and arranged above the heating component; the asbestos board is provided with a placement hole for placing the sample to be tested, a placement table is provided at the bottom of the placement hole, and a first temperature measurement structure is installed at the center of the placement table, and the first temperature measurement structure is used to collect the temperature of the lower surface of the sample to be tested;

[0009] The limiting component is arranged above the asbestos board. The limiting component includes a lifting structure, a clamping structure and a second temperature measuring structure. The clamping structure and the second temperature measuring structure are connected to the movable end of the lifting structure. The clamping structure is used for clamping the specimen to be tested and placing it on the placing table, and the second temperature measuring structure is used for collecting the temperature of the upper surface of the specimen to be tested;

[0010] The temperature acquisition device is electrically connected to the first temperature measuring structure and the second temperature measuring structure.

[0011] The coating heat insulation performance testing device according to the embodiment of the present invention has at least the following beneficial effects:

[0012] By arranging a plurality of placing holes on the asbestos board, it is convenient to place the specimen to be tested and the comparative specimen at the same time, improving the testing efficiency; by setting a limiting component to grab the specimen to be tested, the automatic picking and placing of the specimen to be tested can be realized; the temperatures of the first temperature measuring structure and the second temperature measuring structure can be automatically collected by the temperature acquisition device, with a high degree of automation, which can improve the testing efficiency and accuracy.

[0013] According to some embodiments of the present invention, the placing table is provided with a mounting hole, a first elastic member is arranged in the mounting hole, and the first temperature measuring structure is mounted at the end of the first elastic member.

[0014] According to some embodiments of the present invention, a driving motor is installed at the movable end of the lifting structure, and the clamping structure is connected to the driving motor; the clamping structure includes a bracket and a clamping rod, the clamping rod is slidably installed on the bracket, and the driving motor is used for driving the clamping rod to slide along the bracket.

[0015] According to some embodiments of the present invention, the end of the clamping rod includes a clamping portion and a pressing portion. The clamping portion is used for contacting the circumferential side of the specimen to be tested to clamp the specimen to be tested, and the pressing portion is used for pressing the specimen to be tested against the placing table.

[0016] According to some embodiments of the present invention, the clamping structure further includes a sliding member, a rotating member and a connecting rod. The sliding member and the rotating member are connected by the connecting rod. When the rotating member rotates around its own axis, it can drive the sliding member to approach or move away from the rotating member; the clamping rod is installed on the sliding member, and the driving motor is connected to the rotating member, and the driving motor is used for driving the rotating member to rotate around its own axis.

[0017] According to some embodiments of the present invention, the bracket includes a plurality of partition plates, a sliding area is formed between adjacent partition plates, and the sliding member is slidably installed in the sliding area; the rotating member is provided with an extension portion that extends into the sliding area, and the partition plate can abut against the extension portion to limit the rotation end point of the rotating member; the first end in the length direction of the connecting rod is connected to the extension portion, and the second end in the length direction of the connecting rod is connected to the sliding member.

[0018] According to some embodiments of the present invention, the rotating member is concentrically arranged with the placement table, and the second temperature measuring structure is arranged at the central position of the rotating member.

[0019] According to some embodiments of the present invention, the limiting assembly further includes an elastic telescopic structure, the elastic telescopic structure is installed on the clamping structure, and the second temperature measuring structure is connected to the end of the elastic telescopic structure.

[0020] According to some embodiments of the present invention, the elastic telescopic structure includes a sleeve, a central rod, and a second elastic member. The sleeve is connected to the clamping structure. The sleeve is provided with a central hole extending in the vertical direction. The second elastic member is installed in the central hole. The first end in the length direction of the central rod is slidably installed in the central hole, and the second temperature measuring structure is connected to the second end in the length direction of the central rod.

[0021] According to some embodiments of the present invention, the heating assembly includes a heating plate and a heat dissipation plate. The heating plate is provided with a heat source cavity for installing a heat source, and the heat dissipation plate is arranged above the heating plate.

[0022] According to the coating heat insulation performance testing method of the second aspect of the present invention, the above-mentioned testing device is adopted, and the testing steps are as follows:

[0023] S1. The limiting assembly grabs the test sample to be tested and places it into the placement hole;

[0024] S2. The lifting structure of the limiting assembly drives the clamping structure to descend to press the test sample to be tested against the placement table, so that the lower surface of the test sample to be tested contacts the first temperature measuring structure, and the upper surface of the test sample to be tested contacts the second temperature measuring structure;

[0025] S3. After the heating assembly is heated to the set temperature and lasts for the set time, stop heating and let the test sample to be tested air-cool;

[0026] S4. During the air-cooling process of the test sample to be tested, the temperature acquisition device collects the temperature data of the first temperature measuring structure at the set time interval and draws the first temperature curve, and collects the temperature data of the second temperature measuring structure and draws the second temperature curve;

[0027] S5. By comparing the first temperature curve of the test sample without the thermal barrier coating sprayed thereon with the first temperature curve of the test sample with the thermal barrier coating sprayed thereon, and comparing the second temperature curve of the test sample without the thermal barrier coating sprayed thereon with the second temperature curve of the test sample with the thermal barrier coating sprayed thereon, the heat insulation temperature of the thermal barrier coating is obtained.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Brief Description of the Drawings

[0029] The present invention will be further described below in conjunction with the drawings and embodiments, where:

[0030] Figure 1 is a cross-sectional view of an embodiment of the present invention;

[0031] Figure 2 is Figure 1 an enlarged view of part A in

[0032] Figure 3 is Figure 2 a top view of the clamping structure in

[0033] Reference Numerals in the Drawings:

[0034] Box body 100, accommodation cavity 110, top plate 120, support structure 130;

[0035] Heating assembly 200, heating plate 210, heat source cavity 211, heat dissipation plate 220;

[0036] Asbestos board 300, placement hole 310, placement table 320, mounting hole 321, first elastic member 322, first temperature measuring structure 330;

[0037] Limit assembly 400, lifting structure 410, clamping structure 420, bracket 421, partition plate 4211, sliding area 4212, clamping rod 422, clamping portion 4221, abutting portion 4222, sliding member 423, rotating member 424, extension portion 4241, connecting rod 425, drive motor 430, second temperature measuring structure 440, elastic telescopic structure 450, sleeve 451, central hole 4511, central rod 452, second elastic member 453. Detailed Description of the Embodiment

[0038] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0039] In the description of the present invention, it should be understood that with regard to the orientation description, such as the upper and lower orientations or position relationships indicated, they are based on the orientations or position relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0040] In the description of the present invention, "a plurality of" means more than two. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence relationship of the indicated technical features.

[0041] In the description of the present invention, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0042] Referring to Figures 1 to 3 , a coating heat insulation performance testing device according to an embodiment of the present invention includes a box body 100, a heating assembly 200, an asbestos board 300, a limiting assembly 400, and a temperature acquisition device. The box body 100 has a receiving cavity 110. The heating assembly 200 and the asbestos board 300 are both arranged in the receiving cavity 110, and the asbestos board 300 is arranged above the heating assembly 200. The asbestos board 300 is provided with a placement hole 310 for placing the sample to be tested, and the heating assembly 200 is used to heat the asbestos board 300 and the sample to be tested placed in the placement hole 310. The limiting assembly 400 is arranged above the asbestos board 300 and is used for taking and placing the sample to be tested, including grasping the sample to be tested and putting it into the placement hole 310 of the asbestos board 300, and also taking out the sample to be tested in the placement hole 310. To achieve the above functions, a top plate 120 is slidably installed above the box body 100. The top plate 120 can slide relative to the box body 100. The limiting assembly 400 is installed on the top plate 120. When the top plate 120 slides to a position where the limiting assembly 400 is aligned with the placement hole 310, the limiting assembly 400 can put the sample to be tested it holds into the placement hole 310.

[0043] Referring to Figure 1 , Figure 2As shown, a support structure 130 extending towards the center is provided on the inner sidewall of the box body 100, and the asbestos board 300 is placed on the support structure 130. A placement platform 320 is provided at the bottom of the placement hole 310, and a first temperature measurement structure 330 is installed at the center of the placement platform 320. The first temperature measurement structure 330 is used to collect the temperature of the lower surface of the test sample to be tested; the limiting component 400 includes a lifting structure 410, a clamping structure 420, and a second temperature measurement structure 440. The clamping structure 420 and the second temperature measurement structure 440 are connected to the movable end of the lifting structure 410. The clamping structure 420 is used to clamp the test sample to be tested and place it on the placement platform 320, and the second temperature measurement structure 440 is used to collect the temperature of the upper surface of the test sample to be tested; the temperature acquisition device includes a temperature collector and a control center. The temperature collector is used to collect the temperatures of the first temperature measurement structure 330 and the second temperature measurement structure 440, and the control center is electrically connected to the temperature collector. The control center is used to process and analyze the temperatures collected by the temperature collector. The first temperature measurement structure 330 is preferably an S-type thermocouple, and the second temperature measurement structure 440 is preferably a K-type thermocouple.

[0044] It should be noted that, referring to Figure 1 As shown, a plurality of placement holes 310 are provided on the asbestos board 300. The plurality of placement holes 310 are generally arranged at uniform intervals. At least one of the plurality of placement holes 310 is used to place the test sample to be tested without a thermal barrier coating, and the remaining placement holes 310 can be used to place test samples coated with different thermal barrier coatings, or test samples coated with thermal barrier coatings of different thicknesses, etc. By providing a plurality of placement holes 310 on the asbestos board 300, it is convenient to place the test sample and the comparison sample at the same time, improving the test efficiency; by setting the limiting component 400 to grab the test sample to be tested, the automatic picking and placing of the test sample to be tested can be realized; the temperatures of the first temperature measurement structure 330 and the second temperature measurement structure 440 can both be automatically collected by the temperature acquisition device, with a high degree of automation, which can improve the test efficiency and accuracy.

[0045] Furthermore, since a plurality of placement holes 310 are provided on the asbestos board 300, in order to improve the test accuracy, it is necessary to ensure that the temperature differences in each placement hole 310 are not significant when the heating component 200 heats the test sample to be tested in the placement hole 310. In order to achieve the above technical effect, referring to Figure 1As shown in the figure, the heating component 200 of this embodiment is divided into a heating plate 210 and a heat sink plate 220. The heat sink plate 220 is arranged above the heating plate 210, and the heating plate 210 is used to place a heat source. The heat sink plate 220 generally uses a material with a certain thickness and relatively uniform heat dissipation, such as a stone slab, etc.; the heating plate 210 is provided with a plurality of heat source cavities 211, and heaters such as electric heaters or flame heaters can be placed in the heat source cavities 211; by adopting the above method, the consistency of the temperature rise at each position in the accommodation cavity 110 is further ensured. The plurality of heat source cavities 211 are arranged, and the heat source cavity 211 is preferably frustum-shaped, that is Figure 1 As shown in the figure, the diameter of the top of the heat source cavity 211 is larger than the diameter of the bottom.

[0046] It should be understood that there is generally a certain distance between the asbestos board 300 and the limiting component 400, which can also achieve the effect of making the test specimens in each placement hole 310 be heated evenly.

[0047] In the embodiment of the present invention, the placement table 320 is provided with a mounting hole 321, and a first elastic member 322 is arranged in the mounting hole 321. The first temperature measuring structure 330 is installed at the end of the first elastic member 322. Specifically, referring to Figure 1 、 Figure 2 As shown in the figure, the placement table 320 is generally arranged at the bottom of the placement hole 310, and the test specimen in this embodiment is preferably circular. Therefore, the placement hole 310 is a cylindrical hole, and the placement table 320 is also cylindrical, and the cylinder diameter of the placement table 320 is smaller than the aperture of the placement hole 310. The mounting hole 321 is arranged at the central position of the placement table 320, and the first elastic member 322 is preferably a spring; when not under external force, the first temperature measuring structure 330 partially protrudes above the upper surface of the placement table 320, so as to ensure that when the test specimen is pressed tightly on the placement table 320, the first temperature measuring structure 330 can be in contact with the central position of the test specimen, so as to obtain a more accurate measured temperature.

[0048] In the embodiment of the present invention, a driving motor 430 is installed at the movable end of the lifting structure 410, and the clamping structure 420 is connected to the driving motor 430; the clamping structure 420 includes a bracket 421 and a clamping rod 422, and the clamping rod 422 is slidably installed on the bracket 421, and the driving motor 430 is used to drive the clamping rod 422 to slide along the bracket 421. Specifically, referring to Figure 2 、 Figure 3As shown, the clamping structure 420 further includes a sliding member 423, a rotating member 424, and a connecting rod 425. The sliding member 423 and the rotating member 424 are connected by the connecting rod 425. The rotation of the rotating member 424 about its own axis can drive the sliding member 423 to approach or move away from the rotating member 424. For example, the clockwise rotation of the rotating member 424 about its own axis can drive the sliding member 423 to approach the rotating member 424, and the counterclockwise rotation of the rotating member 424 about its own axis can drive the sliding member 423 to move away from the rotating member 424. It can also be that the clockwise rotation of the rotating member 424 about its own axis drives the sliding member 423 to move away from the rotating member 424, and the counterclockwise rotation of the rotating member 424 about its own axis drives the sliding member 423 to approach the rotating member 424. The driving motor 430 is connected to the rotating member 424, and the driving motor 430 is used to drive the rotating member 424 to rotate about its own axis.

[0049] Further, in the embodiments of the present invention, the specimen to be tested in this embodiment is circular. Therefore, the bracket 421 in this embodiment is circular, and a plurality of partition plates 4211 are provided in the middle of the circle. The plurality of partition plates 4211 are evenly spaced around the circumference, and a sliding area 4212 is formed between adjacent partition plates 4211. The sliding member 423 is slidably installed in the sliding area 4212, and the plurality of sliding areas 4212 are all conical; the sliding member 423 is fan-shaped, the sliding member 423 is slidably installed in the sliding area 4212, the clamping rod 422 is installed on the sliding member 423, the clamping rod 422 is installed on the outer side of the sliding member 423, and the connecting rod 425 is connected to the inner side of the sliding member 423; therefore, when the sliding member 423 moves relative to the rotating member 424, it can drive the clamping rod 422 to move synchronously. The rotating member 424 is installed at the central position of the bracket 421, and the rotating member 424 is concentric with the bracket 421; the rotating member 424 is provided with an extension portion 4241, and the extension portion 4241 extends into the sliding area 4212. The partition plate 4211 can abut against the extension portion 4241 to limit the rotation end point of the rotating member 424; the first end in the length direction of the connecting rod 425 is connected to the extension portion 4241, and the second end in the length direction of the connecting rod 425 is connected to the sliding member 423.

[0050] Refer to Figure 3 As shown, the extension portion 4241 radially protrudes from the outer periphery of the rotating member 424, and the number of the extension portions 4241 is equal to the number of the sliding members 423, that is, each sliding area 4212 has an extension portion 4241, and partition plates 4211 are provided on both sides of the extension portion 4241 in the rotation direction. It should be noted that when the length extension direction of the connecting rod 425 passes through the center of the bracket 421, the relative positions of the sliding member 423 and the rotating member 424 are the farthest. Therefore, when the sliding member 423 is in the position closest to the rotating member 424, the length extension direction of the connecting rod 425 cannot pass through the center of the bracket 421. The two ends in the length direction of the connecting rod 425 are respectively hinged to the rotating member 424 and the sliding member 423.

[0051] In an embodiment of the present invention, the end of the clamping rod 422 includes a clamping portion 4221 and a pressing portion 4222. The clamping portion 4221 is used to contact the circumferential side of the specimen to be tested to clamp the specimen to be tested, and the pressing portion 4222 is used to press the specimen to be tested against the placement table 320. Specifically, referring to Figure 2 , Figure 3 As shown, a plurality of clamping rods 422 are provided, and a plurality of sliding members 423 are all installed with the clamping rods 422. The clamping portion 4221 is connected to the side of the pressing portion 4222 facing away from the center of the bracket 421. The clamping portion 4221 and the pressing portion 4222 are generally made of a flexible material, such as plastic or rubber, etc., so as to avoid damaging the specimen to be tested.

[0052] In an embodiment of the present invention, the rotating member 424 is concentrically arranged with the placement table 320, and the second temperature measuring structure 440 is arranged at the central position of the rotating member 424. Specifically, it is more reliable to collect the temperature data at the center point position of the specimen to be tested than at other positions. Therefore, generally, the temperature at the center point position of the specimen to be tested is collected. Therefore, the rotating member 424 is concentrically arranged with the placement table 320, and then the second temperature measuring structure 440 is installed at the central position of the rotating member 424, so as to ensure that the second temperature measuring structure 440 collects the temperature at the center point of the specimen to be tested.

[0053] In an embodiment of the present invention, the limiting component 400 further includes an elastic telescopic structure 450. The elastic telescopic structure 450 is installed on the clamping structure 420, and the second temperature measuring structure 440 is connected to the end of the elastic telescopic structure 450. Specifically, referring to Figure 2 As shown, the elastic telescopic structure 450 includes a sleeve 451, a central rod 452 and a second elastic member 453. The sleeve 451 is connected to the clamping structure 420. The sleeve 451 is provided with a central hole 4511 extending in the vertical direction. The second elastic member 453 is installed in the central hole 4511. The first end of the central rod 452 in the length direction is slidably installed in the central hole 4511, and the second temperature measuring structure 440 is connected to the second end of the central rod 452 in the length direction. The purpose of setting the elastic telescopic structure 450 is to ensure that when the center position of the specimen to be tested is not so flat, the second temperature measuring structure 440 can still be pressed against the specimen to be tested and will not cause damage to the second temperature measuring structure 440, thereby extending the service life of the second temperature measuring structure 440; and the scheme of using the second elastic member 453 and the central rod 452 has a simple structure, is convenient for maintenance, and is convenient for mass production at low cost.

[0054] According to the coating heat insulation performance testing method of the second aspect embodiment of the present invention, the above-mentioned testing device is adopted, and the testing steps are as follows:

[0055] S1. The limiting component 400 grabs the specimen to be tested and places it into the placement hole 310;

[0056] S2. The lifting structure 410 of the limit assembly 400 drives the clamping structure 420 to descend, so as to press the specimen to be tested against the placement table 320, making the lower surface of the specimen to be tested contact with the first temperature measuring structure 330 and the upper surface of the specimen to be tested contact with the second temperature measuring structure 440;

[0057] S3. After the heating assembly 200 is heated to the set temperature and lasts for the set time, the heating is stopped, and the specimen to be tested is air-cooled;

[0058] S4. During the air-cooling process of the specimen to be tested, the temperature acquisition device collects the temperature data of the first temperature measuring structure 330 at the set time interval and draws the first temperature curve, and collects the temperature data of the second temperature measuring structure 440 and draws the second temperature curve;

[0059] S5. By comparing the first temperature curve of the specimen to be tested without the thermal barrier coating and the first temperature curve of the specimen to be tested with the thermal barrier coating, and comparing the second temperature curve of the specimen to be tested without the thermal barrier coating and the second temperature curve of the specimen to be tested with the thermal barrier coating, the heat insulation temperature of the thermal barrier coating is obtained; the heat insulation temperature generally refers to the difference between the lower surface temperature of the specimen to be tested with the thermal barrier coating and the upper surface temperature of the specimen to be tested without the thermal barrier coating.

[0060] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0061] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present invention.

Claims

1. A coating thermal insulation performance testing device, characterized in that: include: A box body having a containing cavity; A heating component is installed in the accommodating cavity; An asbestos board is installed in the accommodating cavity and is arranged above the heating assembly; the asbestos board is provided with a plurality of placement holes for placing the samples to be tested, a placement platform is provided at the bottom of the placement holes, a first temperature measuring structure is installed at the center of the placement platform, and the first temperature measuring structure is used to collect the temperature of the lower surface of the sample to be tested; A limit assembly is arranged above the asbestos board, the limit assembly includes a lifting structure, a clamping structure and a second temperature measuring structure, the clamping structure and the second temperature measuring structure are connected to the movable end of the lifting structure, the clamping structure is used to clamp the sample to be tested and place it on the landing table, and the second temperature measuring structure is used to collect the temperature of the upper surface of the sample to be tested; the movable end of the lifting structure is installed with a driving motor, and the clamping structure is connected to the driving motor; the clamping structure includes a bracket and a clamping rod, the clamping rod is slidably installed on the bracket, and the driving motor is used to drive the clamping rod to slide along the bracket; The clamping structure further comprises a sliding member, a rotating member and a connecting rod, wherein the sliding member and the rotating member are connected via the connecting rod, and the rotating member can drive the sliding member to move closer to or farther from the rotating member by rotating around its own axis; the clamping rod is mounted on the sliding member, and the driving motor is connected to the rotating member, and the driving motor is used to drive the rotating member to rotate around its own axis; The bracket includes a plurality of partition plates, a sliding area is formed between adjacent partition plates, and the sliding member is slidably installed in the sliding area; the rotating member is provided with an extension portion, the extension portion extends into the sliding area, and the partition plate can abut against the extension portion to limit the rotation end position of the rotating member; the first end of the connecting rod in the length direction is connected to the extension portion, and the second end of the connecting rod in the length direction is connected to the sliding member; A temperature acquisition device is electrically connected to the first temperature measurement structure and the second temperature measurement structure.

2. The coating thermal insulation performance testing device according to claim 1, characterized in that: The placement platform is provided with a mounting hole, a first elastic member is arranged in the mounting hole, and the first temperature measuring structure is installed at the end of the first elastic member.

3. The coating thermal insulation performance testing device according to claim 1, characterized in that: The end of the clamping rod comprises a clamping portion and a pressing portion, wherein the clamping portion is used to contact the peripheral side of the sample to be tested to clamp the sample to be tested, and the pressing portion is used to press the sample to be tested against the placement table.

4. The coating thermal insulation performance testing device according to claim 1, characterized in that: The rotating member is arranged concentrically with the placement platform, and the second temperature measuring structure is arranged at the center position of the rotating member.

5. The coating thermal insulation performance testing device according to claim 1, characterized in that: The limiting assembly also includes an elastic telescopic structure, which is installed on the clamping structure, and the second temperature measuring structure is connected to the end of the elastic telescopic structure.

6. The coating thermal insulation performance testing device according to claim 5, characterized in that: The elastic telescopic structure includes a sleeve, a center rod and a second elastic member. The sleeve is connected to the clamping structure. The sleeve is provided with a center hole extending in a vertical direction. The second elastic member is installed in the center hole. The first end of the center rod in the length direction is slidably installed in the center hole. The second temperature measuring structure is connected to the second end of the center rod in the length direction.

7. A method for testing thermal insulation performance of a coating, characterized in that: The test device according to any one of claims 1 to 6 is used, and the test steps are as follows: S1. The limit assembly grabs the sample to be tested and places it into the placement hole; S2. The lifting structure of the limit assembly drives the clamping structure to descend, so as to press the sample to be tested against the placement table, so that the lower surface of the sample to be tested contacts the first temperature measuring structure, and the upper surface of the sample to be tested contacts the second temperature measuring structure; S3, after the heating component is heated to the set temperature and lasts for the set time, the heating is stopped and the sample to be tested is air-cooled; S4. During the air cooling process of the test sample, the temperature acquisition device collects the temperature data of the first temperature measuring structure at a set time interval and draws a first temperature curve, and collects the temperature data of the second temperature measuring structure and draws a second temperature curve; S5. Obtain the thermal insulation temperature of the thermal barrier coating by comparing the first temperature curve of the sample to be tested without spraying the thermal barrier coating with the first temperature curve of the sample to be tested sprayed with the thermal barrier coating, and comparing the second temperature curve of the sample to be tested without spraying the thermal barrier coating with the second temperature curve of the sample to be tested sprayed with the thermal barrier coating.

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