Automobile coating heat insulation performance testing device and testing method

Abstract

The present application relates to the technical field of coating thermal insulation performance testing, and specifically discloses a kind of automobile coating thermal insulation performance testing device and testing method, the automobile coating thermal insulation performance testing device includes test cabinet, environment simulation unit and test unit;Formed by simulating cavity set temperature and humidity cycle flow air current, effectively simulate the real hot and humid environment working condition;In the process of descending encapsulation of lifting platform, the lower end of sliding sleeve is pushed back after contacting the sample board to be measured, forcing the annular flexible capsule to expand radially, actively rubbing and scraping the water film on the upper surface of the sample board to be measured, creating a dry contact surface for subsequent temperature measurement, the sliding sleeve continues to retract, so that the temperature detection probe is completely exposed and closely attached to the upper surface of the sample board to be measured that has been scraped dry water film, while the driving motor drives the rotating shaft to continue rotating, driving the dehumidifying element at the lower end of the rotating shaft to dissipate the humidity in the measured area, avoiding the humidity from penetrating into the gap between the temperature detection probe and the sample board to be measured and condensing again, thereby improving the accuracy of temperature measurement.

Description

Technical Field

[0001] This invention relates to the field of coating thermal insulation performance testing technology, and more specifically, to a testing device and method for testing the thermal insulation performance of automotive coatings. Background Technology

[0002] In the automotive industry, the thermal insulation performance of coatings directly affects the energy efficiency and driving comfort of vehicles. Especially in high temperature and high humidity environments (such as tropical, coastal or rainy areas), the thermal insulation effect of coatings is crucial for reducing the interior temperature and reducing the air conditioning load. Therefore, testing the thermal insulation performance of automotive coatings under high temperature and humidity conditions has become a key link in research and development and quality control.

[0003] However, existing testing devices still have shortcomings in simulating real-world hot and humid conditions. First, hot and humid environments (such as temperatures above 40°C and relative humidity above 80%) can easily cause water films or condensation to form on the surface of the test sample, which can seriously interfere with the contact accuracy of the temperature probe. In traditional testing methods, when the temperature sensor is in direct contact with a wet and slippery surface, the water film can hinder heat conduction, resulting in lower or fluctuating temperature readings. Furthermore, moisture may seep into the gap between the probe and the sample and condense again, further amplifying the measurement error and causing distortion in the thermal insulation performance assessment.

[0004] Secondly, existing devices struggle to simulate a stable and uniform humid and hot environment. Insufficient airflow circulation easily leads to temperature and humidity stratification, making it impossible to guarantee the uniformity of the test space. Furthermore, they are prone to introducing external air interference, thus failing to quickly construct a stable local high humidity and hot working condition, which affects test accuracy. Summary of the Invention

[0005] To overcome the above-mentioned technical problems, this invention proposes a testing device and method for testing the thermal insulation performance of automotive coatings.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A device for testing the thermal insulation performance of automotive coatings, comprising:

[0008] The test cabinet has a fixed mounting platform inside, and a lifting platform is movably installed above the mounting platform.

[0009] An environmental simulation unit includes a simulation chamber that is horizontally slidably mounted on a mounting platform and a testing chamber that is fixedly mounted on the lower end face of a lifting platform. The simulation chamber is provided with a simulation cavity for simulating a humid and hot environment. The testing chamber is adapted to the simulation chamber to encapsulate the sample to be tested.

[0010] The testing unit, located inside the testing chamber, includes a sliding sleeve slidably embedded in the lower end of the lifting platform and a drive motor fixed to the upper surface of the lifting platform. A temperature detection probe is movably installed at the center of the bottom of the sliding sleeve, and a radially retractable annular flexible bladder is provided on the outside of the temperature detection probe. The output end of the drive motor is connected to a rotating shaft that movably passes through the lifting platform, and a dehumidifying component is provided at the lower end of the rotating shaft.

[0011] As a further embodiment of the present invention: a guide column is vertically fixed on the mounting platform, a top plate is fixed on the top of the guide column, the lifting platform is vertically slidably sleeved on the guide column, a lifting cylinder for driving the lifting platform is installed on the top of the top plate, and a slide rail adapted to the sliding of the simulation chamber is installed on the mounting platform.

[0012] As a further aspect of the present invention: the lifting platform has a cavity for accommodating the sliding sleeve, and a third spring is provided in the cavity to abut against the upper end of the sliding sleeve.

[0013] As a further aspect of the present invention: the sliding sleeve is provided with a plurality of axial sliding grooves and radial sliding grooves in the circumferential direction; an axial slider that abuts against the rotating shaft is slidably embedded in the axial sliding groove; a radial slider is slidably embedded in the radial sliding groove; a connecting rod is hinged between the axial slider and the corresponding radial slider; the annular flexible bladder is sleeved on each group of radial sliders; a sleeve rod is horizontally fixed in the radial sliding groove; a first spring that abuts against the corresponding radial slider is movably sleeved on the sleeve rod.

[0014] As a further embodiment of the present invention: the dehumidifying component includes a telescopic rod that is axially slidably disposed at the lower end of the rotating shaft, the rotating shaft having a telescopic cavity for accommodating the telescopic rod, the telescopic cavity having a plurality of axial limiting strips circumferentially disposed therein that are adapted to slide with the telescopic rod, and a turbine blade being installed at the lower end of the telescopic rod;

[0015] The temperature detection probe is axially slidably sleeved on the sliding sleeve, and a second spring is provided between the sliding sleeve and the temperature detection probe. Several through holes are opened on the sliding sleeve.

[0016] As a further aspect of the present invention: a main air passage communicating with the telescopic cavity is provided inside the telescopic rod, and several branch air passages are provided circumferentially at the lower end of the main air passage; an air cover is fixed on the upper surface of the lifting platform, the air cover is sealed to the rotating shaft, and an air pipe is connected to one side of the air cover; an air cavity communicating with the telescopic cavity is provided inside the rotating shaft, and an air hole communicating with the air cover is provided circumferentially in the air cavity.

[0017] As a further aspect of the present invention: the mounting platform is also provided with a locking unit adapted to the simulation chamber and the testing chamber. The locking unit includes a locking cylinder fixed on the mounting platform. The output end of the locking cylinder is connected to a locking plate. A slot adapted to the locking plate is provided on one side of both the simulation chamber and the testing chamber.

[0018] As a further aspect of the present invention: an ultrasonic atomizer is provided on the bottom surface of the simulation chamber; a turbine turbulence fan connected to the circulating air passage is installed on one side of the simulation chamber; a temperature sensor and a humidity sensor are also provided inside the simulation chamber; a circulating air passage is provided inside the simulation chamber; several electric heating meshes are provided inside the circulating air passage; a through groove is provided on the side of the simulation chamber away from the turbine turbulence fan; an air nozzle adapted to the through groove is provided on the locking plate; and a connecting air passage connecting the air nozzle and the circulating air passage is provided inside the locking plate.

[0019] As a further aspect of the present invention: the two ends of the circulating airway are respectively provided with hydrophobic inclined surfaces, and the bottom of the simulation chamber is detachably installed with a water receiving trough that communicates with the bottom of the hydrophobic inclined surfaces.

[0020] This invention also discloses a testing method for an automotive coating heat insulation performance testing device, comprising the following steps:

[0021] Step 1: Place the coated end of the sample to be tested face down over the opening at the top of the simulation chamber, and then push the simulation chamber horizontally into the testing position inside the test cabinet.

[0022] Step 2: The test chamber and the simulation chamber are interlocked and the sample to be tested is sealed. At the same time, the test conditions of the coating thermal insulation performance under humid and hot environment are simulated inside the simulation chamber.

[0023] Step 3: The sliding sleeve gradually retracts into the lifting platform, driving the annular flexible bladder on the sliding sleeve to gradually expand radially, scraping away the water film in the area to be tested, while the temperature detection probe is exposed and attached to the end face of the sample plate to be tested.

[0024] Step 4: The drive motor drives the rotating shaft and dehumidifier to continuously disperse the moisture in the test area. The temperature is measured on the upper surface of the test sample by the temperature detection probe to test the thermal insulation performance of the test sample.

[0025] The beneficial effects of this invention are:

[0026] The simulation chamber and the testing chamber work together through the built-in simulation cavity, which can quickly and conveniently place the sample to be tested and encapsulate it in an independent testing space; the circulating airflow with set temperature and humidity formed in the simulation cavity can effectively simulate real hot and humid environment conditions.

[0027] In the initial state, the sliding sleeve extends downwards, and the annular flexible capsule is in a radially contracted state, wrapping and protecting the temperature detection probe, effectively isolating it from moisture contamination. During the descent and encapsulation process of the lifting platform, the lower end of the sliding sleeve contacts the sample to be tested and is pushed back, forcing the annular flexible capsule to expand radially and actively scrape away the water film on the surface of the sample to be tested, creating a dry contact surface for subsequent temperature measurement. After scraping away the water, the sliding sleeve continues to retract, fully exposing the temperature detection probe and automatically and tightly adhering it to the surface of the sample to be tested, which has been dried. This ensures that the temperature detection probe is in a clean and dry state when it contacts the surface being tested. At the same time, the drive motor drives the rotating shaft to rotate continuously, causing the dehumidifier at the lower end of the shaft to disperse the moisture in the area to be tested, preventing moisture from seeping into the gap between the temperature detection probe and the sample to be tested and condensing again, thereby improving the accuracy of temperature measurement. Attached Figure Description

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] Figure 1 This is a three-dimensional schematic diagram of an automotive coating heat insulation performance testing device according to the present invention;

[0030] Figure 2 This is a partial structural schematic diagram of an automotive coating heat insulation performance testing device according to the present invention;

[0031] Figure 3 This is a schematic diagram of the mounting platform and simulation chamber in an automotive coating heat insulation performance testing device according to the present invention;

[0032] Figure 4 This is a schematic diagram of the lifting platform and testing chamber in an automotive coating heat insulation performance testing device of the present invention;

[0033] Figure 5 This is a schematic diagram of the top structure of the lifting platform in an automotive coating heat insulation performance testing device according to the present invention.

[0034] Figure 6 This is a cross-sectional view of a test unit in an automotive coating heat insulation performance testing device according to the present invention.

[0035] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0036] Figure 8 for Figure 6 Enlarged view at point B in the middle;

[0037] Figure 9 This is a three-dimensional schematic diagram of the locking unit and simulation chamber in an automotive coating heat insulation performance testing device of the present invention;

[0038] Figure 10This is a cross-sectional view of the locking unit and simulation chamber in an automotive coating heat insulation performance testing device of the present invention;

[0039] Figure 11 for Figure 10 Enlarged view of point C in the middle.

[0040] In the picture:

[0041] 100. Test cabinet; 110. Mounting platform; 120. Lifting platform; 121. Cavity; 122. Third spring; 130. Guide column; 140. Top plate; 150. Lifting cylinder; 160. Slide rail;

[0042] 200. Environmental simulation unit; 210. Simulation chamber; 211. Simulation cavity; 212. Card slot; 213. Through slot; 214. Circulating air passage; 215. Hydrophobic slope; 220. Detection chamber; 230. Ultrasonic atomizer; 240. Turbine baffle fan; 250. Heating grid; 260. Temperature sensor; 270. Humidity sensor; 280. Water collection tank;

[0043] 300. Test unit; 310. Sliding sleeve; 311. Axial groove; 312. Radial groove; 313. Axial slider; 314. Radial slider; 315. Connecting rod; 316. Sleeve rod; 317. First spring; 318. Through hole; 320. Drive motor; 330. Rotating shaft; 331. Telescopic cavity; 332. Axial limiting strip; 333. Air chamber; 334. Air hole; 340. Telescopic rod; 341. Main air passage; 342. Branch air passage; 343. Turbine blade; 350. Temperature detection probe; 351. Second spring; 360. Air cover; 361. Air tube; 370. Annular flexible capsule;

[0044] 400. Locking unit; 410. Locking cylinder; 420. Locking plate; 430. Air nozzle; 440. Connecting air passage;

[0045] 500, Sample to be tested. Detailed Implementation

[0046] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0047] Please see Figures 1 to 4This invention discloses a testing device for the thermal insulation performance of automotive coatings, comprising a testing cabinet 100, an environmental simulation unit 200, and a testing unit 300. The testing cabinet 100 has a fixed mounting platform 110, and a lifting platform 120 is movably disposed above the mounting platform 110. The environmental simulation unit 200 includes a simulation chamber 210 horizontally slidably mounted on the mounting platform 110 and a detection chamber 220 fixedly mounted on the lower end face of the lifting platform 120. The simulation chamber 210 contains a simulation cavity 211 for simulating a humid and hot environment, and the detection chamber 220 is adapted to the simulation chamber 210 to encapsulate the sample 500 to be tested.

[0048] Please see Figure 5 and Figure 6 The testing unit 300 is disposed within the testing chamber 220 and includes a sliding sleeve 310 slidably embedded in the lower end of the lifting platform 120 and a drive motor 320 fixed to the upper end surface of the lifting platform 120. A temperature detection probe 350 is movably installed at the bottom center of the sliding sleeve 310, and a radially retractable annular flexible bladder 370 is provided on the outer side of the temperature detection probe 350. The output end of the drive motor 320 is connected to a rotating shaft 330 that movably passes through the lifting platform 120, and a dehumidifying component is provided at the lower end of the rotating shaft 330.

[0049] Specifically, the simulation chamber 210 is slid horizontally out of the test cabinet 100, and the coated end of the sample 500 to be tested is placed face down over the upper opening of the simulation chamber 211. The simulation chamber 210 is then pushed horizontally into the test position inside the test cabinet 100. The lifting platform 120 is driven to descend vertically until the test chamber 220 and the simulation chamber 210 interlock and seal the sample 500 to be tested. Air with set humidity and temperature is introduced into the simulation chamber 211 below the sample 500 to simulate the thermal insulation performance test conditions of the coating under humid and hot conditions.

[0050] In the initial state (i.e., when the detection chamber 220 and the simulation chamber 210 are separated), the sliding sleeve 310 extends downward from the lower end of the lifting platform 120. At this time, the annular flexible bladder 370 is in a radially contracted state, which can wrap the temperature detection probe 350 at the center position and prevent moisture from covering the temperature detection probe 350 and affecting the subsequent test accuracy.

[0051] During the descent of the lifting platform 120, the annular flexible bladder 370 at the lower end of the sliding sleeve 310 will first contact the upper surface of the sample 500 to be tested. As the lifting platform 120 continues to descend, due to the restriction of the sample 500 at the lower end of the sliding sleeve 310, the sliding sleeve 310 gradually retracts into the lifting platform 120, thereby driving the annular flexible bladder 370 on the sliding sleeve 310 to gradually expand radially. The radially expanded annular flexible bladder 370 is used to rub the area to be tested, so as to radially expand the water film in the area to be tested. The scraping process exposes the temperature detection probe 350 at the center of the sliding sleeve 310, which then adheres to the upper surface of the sample 500 to be tested. The drive motor 320 drives the rotating shaft 330 to rotate continuously, causing the dehumidifier at the lower end of the rotating shaft 330 to disperse the moisture in the test area, preventing moisture from seeping into the gap between the temperature detection probe 350 and the sample 500 to be tested and condensing again. The thermal insulation performance of the sample 500 can then be tested by measuring the temperature of the upper surface of the sample 500 through the temperature detection probe 350.

[0052] It should be noted that, through the collaborative work of the simulation chamber 210 with the test chamber 220 via the built-in simulation cavity 211, the sample 500 to be tested can be placed quickly and conveniently and encapsulated in an independent test space; air with set humidity and temperature is introduced into the simulation chamber 211 to effectively simulate real humid and hot working conditions.

[0053] In the initial state, the sliding sleeve 310 extends downwards, and the annular flexible capsule 370 is in a radially contracted state, wrapping and protecting the temperature detection probe 350, effectively isolating the probe surface from moisture contamination. During the downward sealing process of the lifting platform 120, the lower end of the sliding sleeve 310 contacts the test sample 500 and is pushed back, forcing the annular flexible capsule 370 to expand radially, actively rubbing and scraping away the water film on the upper surface of the test sample 500, creating a dry contact surface for subsequent temperature measurement. After the water is scraped off, the sliding sleeve 310 continues to retract, so that the temperature detection probe 350 is fully exposed and automatically and tightly adheres to the upper surface of the test sample 500 after the water film has been scraped off, ensuring that the temperature detection probe 350 is in a clean and dry state when it contacts the test surface. At the same time, the drive motor 320 drives the rotating shaft 330 to rotate continuously, driving the dehumidifier at the lower end of the rotating shaft 330 to disperse the moisture in the test area, preventing moisture from seeping into the gap between the temperature detection probe 350 and the test sample 500 and condensing again, thereby improving the accuracy of temperature measurement.

[0054] In one embodiment, please refer to Figure 2 and Figure 3 The mounting platform 110 is vertically fixed with a guide column 130, and a top plate 140 is fixed on the top of the guide column 130. The lifting platform 120 is vertically slidably sleeved on the guide column 130. A lifting cylinder 150 for driving the lifting platform 120 is installed on the top of the top plate 140. A slide rail 160 that is slidably adapted to the simulation chamber 210 is installed on the mounting platform 110.

[0055] Specifically, the simulation chamber 210 can slide horizontally along the slide rail 160, thereby realizing the sliding in and out action of the simulation chamber 210, which facilitates the loading and unloading of the test sample 500 in the simulation chamber 210; when the simulation chamber 210 loaded with the test sample 500 slides into the test position in the test cabinet 100 along the slide rail 160, the simulation chamber 210 just reaches the bottom of the test chamber 220. The lifting platform 120 is driven by the lifting cylinder 150 to slide vertically downward along the guide column 130 until the test chamber 220 and the simulation chamber 210 are engaged with each other, thus realizing the encapsulation of the test sample 500.

[0056] Further, please refer to Figure 6 and Figure 7 In order to realize the automatic extension and retraction of the sliding sleeve 310, the lifting platform 120 is provided with a cavity 121 to accommodate the sliding sleeve 310, and a third spring 122 is provided in the cavity 121 to abut against the upper end of the sliding sleeve 310.

[0057] Specifically, in the initial state, due to the elastic force of the third spring 122, the sliding sleeve 310 always slides out of the cavity 121. When the lower end of the sliding sleeve 310 contacts the upper surface of the sample 500 to be tested, as the lifting platform 120 further descends, the sliding sleeve 310 can gradually retract into the cavity 121. At the same time, the third spring 122 is gradually compressed, so that the lower end of the sliding sleeve 310 always sticks tightly to the upper surface of the sample 500 to be tested, ensuring the stability of the subsequent radial scraping of the water film by the annular flexible capsule 370.

[0058] It should be noted that the lifting platform 120 is slidably sleeved on the guide column 130, which ensures that the lifting platform 120 moves in the vertical direction under the drive of the lifting cylinder 150, effectively preventing swaying during the lifting process, and ensuring that the test chamber 220 below can be accurately aligned and stably fastened on the simulation chamber 210, so as to achieve reliable encapsulation of the sample 500 to be tested and provide a stable basic environment for testing.

[0059] In the initial state, the elastic force of the third spring 122 pushes the sliding sleeve 310 out of the cavity 121, causing the lower end of the annular flexible capsule 370 to wrap around and protect the temperature detection probe 350. When the lifting platform 120 descends, the lower end of the sliding sleeve 310 is blocked from contacting the sample 500 to be tested. As the lifting platform 120 continues to descend, the sliding sleeve 310 is forced to overcome the elastic force of the third spring 122 and retract into the cavity 121. During this process, the continuous elastic force generated by the compression of the third spring 122 ensures that the lower end of the sliding sleeve 310 and the annular flexible capsule 370 are always in close contact with the upper surface of the sample 500 to be tested, ensuring that the subsequent radial expansion of the annular flexible capsule 370 and stable scraping of the water film in the test area are effective. During the temperature measurement stage, the sliding sleeve 310 continues to retract, eventually allowing the temperature detection probe 350 to be fully exposed and stably contact the sample surface that has been scraped dry.

[0060] In yet another embodiment, please refer to Figure 6 and Figure 8 For the radial expansion action of the annular flexible bladder 370 at the lower end of the sliding sleeve 310, the sliding sleeve 310 is provided with several axial sliding grooves 311 and radial sliding grooves 312 circumferentially. An axial slider 313 that abuts against the rotating shaft 330 is slidably embedded in the axial sliding groove 311, and a radial slider 314 is slidably embedded in the radial sliding groove 312. A connecting rod 315 is hinged between the axial slider 313 and the corresponding radial slider 314. The annular flexible bladder 370 is sleeved on each set of radial sliders 314. A sleeve rod 316 is horizontally fixed in the radial sliding groove 312, and a first spring 317 that abuts against the corresponding radial slider 314 is movably sleeved on the sleeve rod 316.

[0061] Specifically, in the initial state, due to the elastic force of the first spring 317, the radial slider 314 is always located on the side of the radial groove 312 near the center, so that each group of radial sliders 314 gather together, the annular flexible capsule 370 is in a contracted state and wraps around the outside of the temperature detection probe 350. At this time, under the drive of the connecting rod 315, the radial groove 312 is also at the top of the axial groove 311 and fits against the lower end of the rotating shaft 330.

[0062] When the lower end of the sliding sleeve 310 is in contact with the upper surface of the sample 500 to be tested, as the lifting platform 120 continues to descend, the sliding sleeve 310 gradually retracts into the cavity 121. The axial slider 313 is restricted by the axial direction of the rotating shaft 330, so that the axial slider 313 cannot move upward synchronously with the sliding sleeve 310 relative to the lifting platform 120. As a result, the axial slider 313 gradually slides downward along the corresponding axial groove 311. Under the transmission of the connecting rod 315, the corresponding radial slider 314 can be driven to move radially away from the center along the radial groove 312. In this way, the radially expanded radial slider 314 can be used to expand the annular flexible capsule 370, so that the annular flexible capsule 370 expands radially to scrape off the water film in the area to be tested. At the same time, the temperature detection probe 350 at the center is exposed and closely attached to the upper surface of the sample 500 to be tested.

[0063] Further, please refer to Figure 6 , Figure 7 and Figure 8 The dehumidifying component includes a telescopic rod 340 that is axially slidably disposed at the lower end of a rotating shaft 330. A telescopic cavity 331 is provided in the rotating shaft 330 to accommodate the telescopic rod 340. A plurality of axial limiting strips 332 that are slidably adapted to the telescopic rod 340 are provided in the telescopic cavity 331. A turbine blade 343 is installed at the lower end of the telescopic rod 340.

[0064] The temperature detection probe 350 is axially slidably sleeved on the sliding sleeve 310. A second spring 351 is provided between the sliding sleeve 310 and the temperature detection probe 350. The sliding sleeve 310 has several through holes 318.

[0065] Specifically, after the annular flexible capsule 370 expands radially, under the elastic force of the second spring 351, the temperature detection probe 350 pushes downward and closely adheres to the upper surface of the sample 500 to be tested;

[0066] During the process of the sliding sleeve 310 retracting into the cavity 121, the upper end of the temperature detection probe 350 pushes the telescopic rod 340 upward into the telescopic cavity 331, thereby realizing the adaptive telescopic adjustment of the telescopic rod 340 relative to the rotating shaft 330. As the rotating shaft 330 is continuously rotated by the drive motor 320, since the telescopic rod 340 can only slide axially relative to the rotating shaft 330 and cannot rotate circumferentially, it can drive the telescopic rod 340 to rotate synchronously, thereby driving the turbine blades 343 to rotate. This can form a dispersing airflow above the temperature detection probe 350 to avoid the condensation of moisture in the area to be measured.

[0067] It should be noted that the drive motor 320 drives the rotating shaft 330 to rotate continuously, which drives the telescopic rod 340 at its lower end to rotate synchronously with the turbine blades 343. The rotating turbine blades 343 generate directional airflow in the area above the temperature detection probe 350, actively dispersing the humid air that may accumulate above the test area, effectively preventing moisture in the humid and hot environment from condensing again on the surface of the test sample 500 after the water film has been scraped off or near the temperature detection probe 350, ensuring that the temperature measurement environment is dry and stable.

[0068] The telescopic rod 340 is axially slidably disposed in the telescopic cavity 331 at the lower end of the rotating shaft 330. The sliding adaptation is achieved by the axial limiting strip 332, so that the telescopic rod 340 can only slide axially relative to the rotating shaft 330 and cannot rotate circumferentially. This ensures the reliable transmission of rotational power from the rotating shaft 330 to the telescopic rod 340 and the turbine blade 343. During the process of the sliding sleeve 310 retracting into the cavity 121, when the temperature detection probe 350 moves down to fit the template under the elastic force of the second spring 351, its upper end simultaneously pushes the telescopic rod 340 upward into the telescopic cavity 331. This realizes the automatic extension and retraction adjustment of the telescopic rod 340 as the probe position changes, ensuring that the turbine blade 343 is always at a reasonable working height.

[0069] After the annular flexible flap 370 completes radial expansion and squeezing, the elastic force of the second spring 351 immediately pushes the temperature detection probe 350 downward, so that it fits tightly and stably against the upper surface of the sample 500 that has been squeezed dry, providing reliable contact for accurate temperature measurement; the through hole 318 on the sliding sleeve 310 ensures that the dispersing airflow generated by the turbine blades 343 can pass smoothly through and cover the area to be measured, avoiding airflow obstruction.

[0070] Furthermore, please refer to Figure 6 , Figure 7 and Figure 8 To facilitate the removal of moisture from the test area, a main air passage 341 communicating with the telescopic cavity 331 is provided inside the telescopic rod 340, and several branch air passages 342 are provided circumferentially at the lower end of the main air passage 341; an air cover 360 is fixed on the upper surface of the lifting platform 120, the air cover 360 is sealed to the rotating shaft 330, and an air pipe 361 is connected to one side of the air cover 360; an air chamber 333 communicating with the telescopic cavity 331 is provided inside the rotating shaft 330, and an air hole 334 communicating with the air cover 360 is provided circumferentially in the air chamber 333;

[0071] Specifically, while the rotating shaft 330 drives the turbine blades 343 to rotate circumferentially, air is drawn into the air hood 360 through the air pipe 361 of the external air extraction device. This allows the moisture in the test area to flow upward sequentially through the branch air passage 342, the main air passage 341, the telescopic cavity 331, and the air chamber 333, and finally enter the air hood 360 through the air hole 334 and be drawn out by the air pipe 361. This achieves continuous and uninterrupted discharge of moisture from the test area, and the synchronous operation of the turbine blades 343 is not affected during the dehumidification process.

[0072] In further embodiments, please refer to Figure 9 and Figure 10 The mounting platform 110 is also provided with a locking unit 400 adapted to the simulation chamber 210 and the detection chamber 220. The locking unit 400 includes a locking cylinder 410 fixed on the mounting platform 110. The output end of the locking cylinder 410 is connected to a locking plate 420. The simulation chamber 210 and the detection chamber 220 are each provided with a slot 212 adapted to the locking plate 420 on one side.

[0073] Specifically, after the simulation chamber 210 slides to the detection position, the detection chamber 220 moves downward and engages with the simulation chamber 210. Then, the locking cylinder 410 drives the locking plate 420 to extend horizontally, so that the locking plate 420 just fits into the slot 212 on the simulation chamber 210 and the detection chamber 220. Thus, the locking plate 420 locks the positions of the simulation chamber 210 and the detection chamber 220, preventing relative slippage between the simulation chamber 210 and the detection chamber 220 during the test and avoiding damage to the humid heat simulation environment, thus ensuring the stability of the test process.

[0074] Further, please refer to Figure 10 and Figure 11To construct a humid and hot simulated environment within the simulation chamber 211, an ultrasonic atomizer 230 is installed on the bottom surface of the simulation chamber 211, a turbine turbulence fan 240 connected to the circulating air duct 214 is installed on one side of the simulation chamber 211, and a temperature sensor 260 and a humidity sensor 270 are also installed inside the simulation chamber 211; a circulating air duct 214 is provided inside the simulation chamber 210, and several electric heating meshes 250 are provided inside the circulating air duct 214; a through groove 213 is provided on the side of the simulation chamber 211 away from the turbine turbulence fan 240, an air nozzle 430 adapted to the through groove 213 is provided on the locking plate 420, and a connecting air duct 440 connecting the air nozzle 430 and the circulating air duct 214 is provided inside the locking plate 420;

[0075] Specifically, after the locking plate 420 is inserted into the slot 212, the air nozzle 430 on the locking plate 420 is inserted into the through slot 213, and at the same time, the lower opening of the connecting air passage 440 is connected and connected to the circulation air passage 214, thereby creating a simulation environment independent of the outside world inside the simulation cavity 211. When the turbine spoiler fan 240 is turned on, the airflow in the simulation cavity 211 is drawn into the circulation air passage 214, and then flows back to the simulation cavity 211 in sequence through the circulation air passage 214, the connecting air passage 440, and the air nozzle 430. Within the simulation chamber 211, a circulating airflow is formed. Simultaneously, the ultrasonic atomizer 230 and the electric heating mesh 250 are activated. The ultrasonic atomizer 230 humidifies the airflow passing above it, and the electric heating mesh 250 heats the airflow passing through it. Temperature and humidity are detected by temperature sensor 260 and humidity sensor 270 respectively until the temperature and humidity of the airflow in the simulation chamber 211 reach the required test standards, thus realizing the test conditions of the humid and hot simulated environment.

[0076] It should be noted that when the turbine turbulence fan 240 is activated, the airflow is driven to circulate through the simulation cavity 211, the circulation air duct 214, the connecting air duct 440 and the air nozzle 430 in sequence and then flow back to the simulation cavity 211, thereby forming an independent and closed circulation air duct. This forces the airflow to flow continuously at high speed in the simulation cavity 211, avoids temperature and humidity stratification, and ensures the uniformity of the simulation environment.

[0077] The ultrasonic atomizer 230 atomizes the stored water and sprays it out to humidify the airflow, providing fast response and precise humidity control. Multiple sets of electric heating meshes 250 in the circulating air duct 214 heat the airflow in segments, improving heat exchange efficiency and making temperature control more precise. The airflow circulation accelerates the diffusion speed of the humid heat medium in the simulation cavity 211, shortening the environment construction time. The electric heating meshes 250 built into the circulating air duct 214 directly heat the flowing air, resulting in low heat loss and low energy consumption. The temperature sensor 260 and humidity sensor 270 monitor the temperature and humidity parameters in the simulation cavity 211 in real time, forming a closed-loop feedback control to achieve dynamic temperature and humidity balance.

[0078] Furthermore, please refer to Figure 11 Considering that during the circulation of airflow in the circulation channel 214, some moisture in the airflow will inevitably condense and settle, for this reason, the circulation channel 214 is provided with a water-draining slope 215 at both ends, and the simulation chamber 210 is detachably installed with a water receiving trough 280 that communicates with the bottom of the water-draining slope 215.

[0079] Specifically, when moisture in the airflow in the circulating airway 214 condenses and settles, the water flow converges into the water collection tank 280 under the guiding effect of the drainage slope 215, thereby enabling the collection of accumulated water.

[0080] The present invention also provides a testing method for an automotive coating heat insulation performance testing device, comprising the following steps:

[0081] Step 1: Place the coated end of the sample 500 to be tested face down over the opening at the top of the simulation chamber 211, and then push the simulation chamber 210 horizontally into the testing position inside the test cabinet 100.

[0082] Step 2: The test chamber 220 is connected to the simulation chamber 210 and the sample 500 to be tested is sealed. At the same time, the simulation chamber 211 simulates the test conditions of the coating thermal insulation performance under humid and hot environment.

[0083] Step 3: The sliding sleeve 310 gradually retracts into the lifting platform 120, driving the annular flexible bladder 370 on the sliding sleeve 310 to gradually expand radially, scraping away the water film in the area to be tested. At the same time, the temperature detection probe 350 is exposed and attached to the upper surface of the sample 500 to be tested.

[0084] Step 4: The drive motor 320 drives the rotating shaft 330 and the dehumidifier to continuously disperse the moisture in the test area. The temperature detection probe 350 measures the temperature of the upper surface of the test sample 500 to test the thermal insulation performance of the test sample 500.

[0085] The specific embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention, all of which are within the protection scope of the present invention.

Claims

1. A device for testing the thermal insulation performance of automotive coatings, characterized in that, include: The test cabinet (100) has a fixed mounting platform (110) inside, and a lifting platform (120) is movably arranged above the mounting platform (110). The environmental simulation unit (200) includes a simulation chamber (210) that is horizontally slidably installed on the mounting platform (110) and a test chamber (220) that is fixedly installed on the lower end face of the lifting platform (120). The simulation chamber (210) is provided with a simulation cavity (211) for simulating a humid and hot environment. The test chamber (220) is adapted to the simulation chamber (210) to encapsulate the test sample (500). The test unit (300), which is set in the test chamber (220), includes a sliding sleeve (310) slidably embedded in the lower end of the lifting platform (120) and a drive motor (320) fixed to the upper end of the lifting platform (120). A temperature detection probe (350) is movably installed at the bottom center of the sliding sleeve (310). A radially retractable annular flexible bladder (370) is provided on the outside of the temperature detection probe (350). The output end of the drive motor (320) is connected to a rotating shaft (330) that movably passes through the lifting platform (120). A dehumidifying component is provided at the lower end of the rotating shaft (330).

2. The automotive coating heat insulation performance testing device according to claim 1, characterized in that, A guide column (130) is vertically fixed on the mounting platform (110), and a top plate (140) is fixed on the top of the guide column (130). The lifting platform (120) is vertically slidably sleeved on the guide column (130). A lifting cylinder (150) for driving the lifting platform (120) is installed on the top of the top plate (140). A slide rail (160) that is slidably adapted to the simulation chamber (210) is installed on the mounting platform (110).

3. The automotive coating heat insulation performance testing device according to claim 1, characterized in that, The lifting platform (120) has a cavity (121) for accommodating the sliding sleeve (310), and a third spring (122) is provided in the cavity (121) to abut against the upper end of the sliding sleeve (310).

4. The automotive coating heat insulation performance testing device according to claim 3, characterized in that, The sliding sleeve (310) is provided with several axial sliding grooves (311) and radial sliding grooves (312) in the circumferential direction. An axial slider (313) that abuts against the rotating shaft (330) is slidably embedded in the axial sliding groove (311). A radial slider (314) is slidably embedded in the radial sliding groove (312). A connecting rod (315) is hinged between the axial slider (313) and the corresponding radial slider (314). The annular flexible bladder (370) is sleeved on each group of radial sliders (314). A sleeve rod (316) is horizontally fixed in the radial sliding groove (312). A first spring (317) that abuts against the corresponding radial slider (314) is movably sleeved on the sleeve rod (316).

5. The automotive coating heat insulation performance testing device according to claim 1, characterized in that, The dehumidification component includes a telescopic rod (340) that is axially slidably disposed at the lower end of a rotating shaft (330). The rotating shaft (330) has a telescopic cavity (331) for accommodating the telescopic rod (340). The telescopic cavity (331) is circumferentially provided with a plurality of axial limiting strips (332) that are slidably adapted to the telescopic rod (340). A turbine blade (343) is installed at the lower end of the telescopic rod (340). The temperature detection probe (350) is axially slidably sleeved on the sliding sleeve (310), and a second spring (351) is provided between the sliding sleeve (310) and the temperature detection probe (350). The sliding sleeve (310) has several through holes (318).

6. The automotive coating heat insulation performance testing device according to claim 5, characterized in that, The telescopic rod (340) has a main air passage (341) that communicates with the telescopic cavity (331), and the lower end of the main air passage (341) has several branch air passages (342) circumferentially arranged; the upper end face of the lifting platform (120) is fixed with an air cover (360), the air cover (360) is sealed to the rotating shaft (330), and an air pipe (361) is connected to one side of the air cover (360); the rotating shaft (330) has an air chamber (333) that communicates with the telescopic cavity (331), and the air chamber (333) has an air hole (334) circumferentially arranged that communicates with the air cover (360).

7. The automotive coating heat insulation performance testing device according to claim 1, characterized in that, The mounting platform (110) is also provided with a locking unit (400) adapted to the simulation chamber (210) and the detection chamber (220). The locking unit (400) includes a locking cylinder (410) fixed on the mounting platform (110). The output end of the locking cylinder (410) is connected to a locking plate (420). The simulation chamber (210) and the detection chamber (220) are each provided with a slot (212) adapted to the locking plate (420) on one side.

8. The automotive coating heat insulation performance testing device according to claim 7, characterized in that, An ultrasonic atomizer (230) is provided on the bottom surface of the simulation chamber (211). A turbine turbulence fan (240) connected to the circulating air passage (214) is installed on one side of the simulation chamber (211). A temperature sensor (260) and a humidity sensor (270) are also provided in the simulation chamber (211). A circulating air passage (214) is provided in the simulation chamber (210). Several electric heating meshes (250) are provided in the circulating air passage (214). A through groove (213) is provided on the side of the simulation chamber (211) away from the turbine turbulence fan (240). An air nozzle (430) adapted to the through groove (213) is provided on the locking plate (420). A connecting air passage (440) connecting the air nozzle (430) and the circulating air passage (214) is provided in the locking plate (420).

9. The automotive coating heat insulation performance testing device according to claim 8, characterized in that, The circulating airway (214) is provided with a hydrophobic slope (215) at both ends, and the simulation chamber (210) is detachably installed with a water receiving trough (280) that communicates with the bottom of the hydrophobic slope (215).

10. A test method using the automotive coating heat insulation performance testing device according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Place the coated end of the sample to be tested (500) face down over the opening at the top of the simulation chamber (211), and then push the simulation chamber (210) horizontally into the testing position inside the test cabinet (100); Step 2: The test chamber (220) descends and interlocks with the simulation chamber (210), and the sample to be tested (500) is sealed. At the same time, the simulation chamber (211) simulates the test conditions of the coating thermal insulation performance under humid and hot environment. Step 3: The sliding sleeve (310) gradually retracts into the lifting platform (120), driving the annular flexible bladder (370) on the sliding sleeve (310) to gradually expand radially, scraping away the water film in the area to be tested, while the temperature detection probe (350) is exposed and attached to the upper surface of the sample (500) to be tested. Step 4: The drive motor (320) drives the rotating shaft (330) and the dehumidifier to continuously disperse the moisture in the test area. The temperature is measured on the upper surface of the test sample (500) by the temperature detection probe (350) to test the heat insulation performance of the test sample (500).

Images