Device and method for testing heat insulation performance of automobile coating

Abstract

The invention relates to the technical field of coating heat insulation performance testing, and particularly discloses an automobile coating heat insulation performance testing device and method, and the automobile coating heat insulation performance testing device comprises a testing cabinet, an environment simulation unit and a testing unit; a real humid and hot environment working condition is effectively simulated through a set-temperature and set-humidity circular flow air flow formed in the simulation cavity; in the descending packaging process of the lifting platform, the lower end of the sliding sleeve is pushed back after making contact with the to-be-detected sample plate, the annular flexible capsule piece is forced to be expanded in the radial direction, a water film on the upper surface of the to-be-detected sample plate is scraped through active friction, a dry contact face is created for subsequent temperature measurement, and the sliding sleeve continues to retract; meanwhile, the driving motor drives the rotating shaft to rotate continuously to drive the dehumidifying piece at the lower end of the rotating shaft to disperse moisture in a to-be-detected area, so that the moisture is prevented from permeating into a gap between the temperature detection probe and the to-be-detected sample plate and being condensed again; therefore, the accuracy of temperature measurement is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of paint thermal insulation performance testing, more particularly, it relates to a kind of automobile paint thermal insulation performance testing device and testing method. BACKGROUND

[0002] In the automobile industry, the thermal insulation performance of paint directly affects the energy efficiency and ride comfort of vehicles, especially in high temperature and high humidity environments (such as tropical, coastal or rainy areas), the thermal insulation effect of paint is crucial to reduce the temperature inside the vehicle and reduce air conditioning load; Therefore, under high humidity and heat conditions, the thermal insulation performance test of automobile paint becomes a key link of research and quality control; However, the existing testing device still has deficiencies when simulating real hot and humid conditions; First, hot and humid environments (such as temperatures above 40°C and relative humidity above 80%) are prone to form water films or condensation droplets on the surface of the sample to be tested, which can seriously interfere with the contact accuracy of the temperature probe; In the traditional testing method, when the temperature sensor directly contacts the wet and slippery surface, the water film will hinder heat conduction, causing the temperature reading to be low or fluctuating, and the moisture may condense again after penetrating the gap between the probe and the sample, further amplifying the measurement error, resulting in distorted thermal insulation performance evaluation; Secondly, the existing device is difficult to achieve stable and uniform hot and humid environment simulation, the air circulation is not sufficient, which is prone to temperature and humidity stratification, cannot guarantee the uniformity of the test space, and is easy to introduce external air interference, so as to cannot quickly build stable local high humidity and heat conditions, affecting the test accuracy. SUMMARY

[0003] In order to overcome the above technical problems, the present application provides a kind of automobile paint thermal insulation performance testing device and testing method.

[0004] The purpose of the present application can be achieved by the following technical solutions: A kind of automobile paint thermal insulation performance testing device, comprising: A test cabinet is fixed with a mounting table inside, a lifting platform is movably arranged above the mounting table; An environment simulation unit includes a simulation bin horizontally slidingly installed on the mounting table and a detection bin fixedly installed on the lower end face of the lifting platform, the simulation bin is provided with a simulation cavity for simulating a hot and humid environment, and the detection bin is adapted to the simulation bin to encapsulate the sample to be tested; A test unit is arranged in the detection bin, including a sliding sleeve slidingly embedded in the lower end of the lifting platform and a driving motor fixedly arranged on the upper end face of the lifting platform, a temperature detection probe is movably installed at the center of the bottom of the sliding sleeve, and an annular flexible bladder is arranged outside the temperature detection probe; The output end of the driving motor is connected with a rotating shaft movably penetrating through the lifting platform, and a dehumidifying piece is arranged at the lower end of the rotating shaft.

[0005] As a further scheme of the present application: a guide column is vertically fixed on the mounting table, a top plate is fixed on the top of the guide column, the lifting table vertically slides on the guide column, a lifting cylinder for driving the lifting table is installed on the top of the top plate, and a sliding rail matched with the simulation bin is installed on the mounting table.

[0006] As a further scheme of the present application: a cavity for accommodating the sliding sleeve is formed in the lifting table, and a third spring abutting against the upper end of the sliding sleeve is arranged in the cavity.

[0007] As a further scheme of the present application: a plurality of axial sliding grooves and radial sliding grooves are formed in the sliding sleeve in the circumferential direction, an axial sliding block abutting against the rotating shaft is slidably arranged in the axial sliding groove, a radial sliding block is slidably arranged in the radial sliding groove, a connecting rod is hingedly connected between the axial sliding block and the corresponding radial sliding block, and the annular flexible capsule is sleeved on each group of radial sliding blocks; a sleeve rod is horizontally fixed in the radial sliding groove, and a first spring abutting against the corresponding radial sliding block is movably sleeved on the sleeve rod.

[0008] As a further scheme of the present application: the dehumidifying piece comprises a telescopic rod axially slidingly arranged at the lower end of the rotating shaft, a telescopic cavity accommodating the telescopic rod is formed in the rotating shaft, a plurality of axial limiting strips slidingly matched with the telescopic rod are arranged in the circumferential direction of the telescopic cavity, and a turbine blade is installed at the lower end of the telescopic rod. The temperature detection probe axially slides on the sliding sleeve, the second spring is arranged between the sliding sleeve and the temperature detection probe, and a plurality of through holes are formed in the sliding sleeve.

[0009] As a further scheme of the present application: a main air duct in communication with the telescopic cavity is formed in the telescopic rod, a plurality of branch air ducts are formed in the circumferential direction of the lower end of the main air duct; an air cover is fixed on the upper end surface of the lifting table, the air cover is sealingly connected with the rotating shaft, and an air pipe is connected to one side of the air cover; an air cavity in communication with the telescopic cavity is formed in the rotating shaft, and an air hole in communication with the air cover is formed in the circumferential direction of the air cavity.

[0010] As a further scheme of the present application: a locking unit matched with the simulation bin and the detection bin is further arranged on the mounting table, the locking unit comprises a locking cylinder fixed on the mounting table, a locking plate is connected to the output end of the locking cylinder, and a clamping groove matched with the locking plate is formed in one side of the simulation bin and the detection bin.

[0011] As a further solution of the present invention: an ultrasonic atomizer is provided on the bottom surface of the simulation cavity, a turbine spoiler fan connected to the circulating air duct is installed on one side of the simulation cavity, and a temperature sensor and a humidity sensor are also provided in the simulation cavity; a circulating air duct is opened in the simulation chamber, and a number of electric heating meshes are provided in the circulating air duct; a through groove is opened on the side of the simulation cavity away from the turbine spoiler fan, an air nozzle adapted to the through groove is provided on the locking plate, and a connecting air duct connecting the air nozzle and the circulating air duct is opened in the locking plate.

[0012] As a further solution of the present invention: hydrophobic slopes are respectively provided at both ends of the circulating air duct, and a water receiving trough connected to the bottom of the hydrophobic slope is detachably installed at the bottom of the simulation chamber.

[0013] The present invention also discloses a method for testing a thermal insulation performance testing device for automobile coatings, comprising the following steps: Step 1: Place the coated end of the sample to be tested facing down on the upper opening of the simulation chamber, and then push the simulation chamber horizontally into the testing position in the test cabinet; Step 2: The lower chamber of the test chamber is buckled with the simulation chamber, and the sample to be tested is encapsulated, while the thermal insulation performance test conditions of the coating in the simulated hot and humid environment in the chamber are simulated; Step 3: The sliding sleeve is gradually retracted into the lifting platform, driving the annular flexible capsule on the sliding sleeve to gradually expand radially, scraping off the water film in the area to be tested, and at the same time, the temperature detection probe is exposed and attached to the end surface of the sample to be tested; Step 4: The motor drives the rotating shaft and the dehumidifying element to continuously dissipate the moisture in the test area, and the temperature of the upper surface of the test sample is measured by the temperature detection probe to test the thermal insulation performance of the test sample.

[0014] Beneficial effects of the present invention: The simulation chamber with built-in simulation cavity works in conjunction with the test chamber, which can quickly and conveniently place the sample to be tested and encapsulate it in an independent test space; the circulating airflow with set temperature and humidity formed in the simulation cavity effectively simulates the real hot and humid environment conditions; In the initial state, the sliding sleeve is extended downward, the annular flexible capsule is in a radially contracted state, and the temperature detection probe is wrapped and protected, effectively isolating the moisture pollution on the surface of the probe; during the downward packaging process of the lifting platform, the sliding sleeve is pushed back after the lower end contacts the measured sample plate, forcing the annular flexible capsule to expand radially, actively scraping the water film on the upper surface of the measured sample plate, creating a dry contact surface for subsequent temperature measurement; after the water scraping is completed, the sliding sleeve continues to retract, so that the temperature detection probe is completely exposed and automatically closely attached to the upper surface of the measured sample plate that has been scraped dry, ensuring that the temperature detection probe is in a clean and dry state when contacting the measured surface, and at the same time, the driving motor drives the rotating shaft to continuously rotate, driving the dehumidifying member at the lower end of the rotating shaft to dissipate the moisture in the measured area, avoiding the moisture from penetrating into the gap between the temperature detection probe and the measured sample plate and condensing again, thereby improving the accuracy of temperature measurement. BRIEF DESCRIPTION OF DRAWINGS

[0015] The application will be further described below with reference to the accompanying drawings.

[0016] Figure 1 Fig. 1 is a perspective view of a car paint heat insulation performance testing device according to the present application; Figure 2 Fig. 2 is a partial structure schematic view of a car paint heat insulation performance testing device according to the present application; Figure 3 Fig. 3 is a structure schematic view of an installation table and a simulation bin in a car paint heat insulation performance testing device according to the present application; Figure 4 Fig. 4 is a structure schematic view of a lifting table and a detection bin in a car paint heat insulation performance testing device according to the present application; Figure 5 Fig. 5 is a top structure schematic view of a lifting table in a car paint heat insulation performance testing device according to the present application; Figure 6 Fig. 6 is a sectional view of a testing unit in a car paint heat insulation performance testing device according to the present application; Figure 7 Fig. 7 is a sectional view of a testing unit in a car paint heat insulation performance testing device according to the present application; Figure 6 Fig. 8 is an enlarged view of position A in Fig. 7; Figure 8 Figure 6 Fig. 9 is an enlarged view of position B in Fig. 7; Figure 9 Fig. 10 is a perspective view of a locking unit and a simulation bin in a car paint heat insulation performance testing device according to the present application; Figure 10 Fig. 11 is a sectional view of a locking unit and a simulation bin in a car paint heat insulation performance testing device according to the present application; Figure 11 Fig. 12 is an enlarged view of position C in Fig. 11. Figure 10 In the drawings:

[0017] ​​100, test cabinet; 110, mounting table; 120, lifting table; 121, cavity; 122, third spring; 130, guide column; 140, top plate; 150, lifting cylinder; 160, slide rail; 200, environment simulation unit; 210, simulation bin; 211, simulation cavity; 212, clamping groove; 213, through groove; 214, circulating air channel; 215, water draining slope; 220, detection bin; 230, ultrasonic atomizer; 240, turbo turbulating fan; 250, electric heating mesh; 260, temperature sensor; 270, humidity sensor; 280, water receiving groove; 300, test unit; 310, sliding sleeve; 311, axial sliding groove; 312, radial sliding groove; 313, axial sliding block; 314, radial sliding block; 315, connecting rod; 316, sleeve rod; 317, first spring; 318, through hole; 320, driving motor; 330, rotating shaft; 331, telescopic cavity; 332, axial limiting strip; 333, air cavity; 334, air hole; 340, telescopic rod; 341, main air channel; 342, branch air channel; 343, turbo blade; 350, temperature detection probe; 351, second spring; 360, air cover; 361, air pipe; 370, annular flexible capsule; 400, locking unit; 410, locking cylinder; 420, locking plate; 430, air nozzle; 440, connecting air channel; 500, sample to be tested. DETAILED DESCRIPTION

[0018] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that the discussion of these implementations is merely meant to provide a better understanding of the subject matter described herein and can be changed in function and arrangement without departing from the scope of the disclosure. Various examples can omit, substitute, or add various procedures or components as appropriate. Also, features described with respect to some examples can be combined in other examples.

[0019] Referring to Figures 1 to 4 The application discloses a device for testing the heat insulation performance of automobile paint, which comprises a test cabinet 100, an environment simulation unit 200 and a test unit 300. The test cabinet 100 is internally fixed with a mounting table 110, and the mounting table 110 is movably provided with a lifting table 120 above. The environment simulation unit 200 comprises a simulation bin 210 horizontally slidingly mounted on the mounting table 110 and a detection bin 220 fixedly mounted on the lower end face of the lifting table 120. The simulation bin 210 is internally provided with a simulation cavity 211 for simulating a hot and humid environment. The detection bin 220 is adapted to the simulation bin 210 to encapsulate a sample to be tested 500. Referring to Figure 5 andFigure 6 The test unit 300 is arranged in the detection chamber 220, and includes a sliding sleeve 310 slidingly arranged at the lower end of the lifting table 120 and a driving motor 320 fixed to the upper end surface of the lifting table 120. A temperature detection probe 350 is movably arranged at the center of the bottom of the sliding sleeve 310. An annular flexible capsule 370 is arranged outside the temperature detection probe 350 and can radially expand and contract. A rotating shaft 330 movably penetrating the lifting table 120 is connected to the output end of the driving motor 320. A dehumidifying member is arranged at the lower end of the rotating shaft 330. Specifically, the simulation chamber 210 is horizontally slid out of the test cabinet 100, the sample board 500 to be tested is placed on the upper end opening of the simulation cavity 211 with the end face coated with paint facing downward, and then the simulation chamber 210 is horizontally pushed into the detection position in the test cabinet 100. The lifting table 120 is driven to vertically descend until the detection chamber 220 and the simulation chamber 210 are mutually buckled and the sample board 500 to be tested is encapsulated. Air with a set humidity and temperature is introduced into the simulation cavity 211 below the sample board 500 to be tested, so as to simulate the paint heat insulation performance test working condition in a humid and hot environment. In the initial state (i.e. when the detection chamber 220 and the simulation chamber 210 are in a separated state), the sliding sleeve 310 extends downward from the lower end surface of the lifting table 120. At this time, the annular flexible capsule 370 is in a radially contracted state, so as to wrap the temperature detection probe 350 at the center position and avoid the moisture covering the temperature detection probe 350 to affect the subsequent test precision. During the descending process of the lifting table 120, the annular flexible capsule 370 at the lower end of the sliding sleeve 310 first contacts the upper end surface of the sample board 500 to be tested. As the lifting table 120 continues to descend, the sliding sleeve 310 gradually retracts into the lifting table 120 due to the limitation of the sample board 500 to be tested at the lower end of the sliding sleeve 310, so as to drive the annular flexible capsule 370 on the sliding sleeve 310 to gradually radially expand and stretch. The radially expanded and stretched annular flexible capsule 370 rubs the tested area to radially scrape off the water film of the tested area, and at the same time, the temperature detection probe 350 at the center of the sliding sleeve 310 is exposed and adheres to the upper end surface of the sample board 500 to be tested. The driving motor 320 drives the rotating shaft 330 to continuously rotate, and drives the dehumidifying member at the lower end of the rotating shaft 330 to dissipate the moisture in the tested area, so as to avoid the moisture penetrating into the gap between the temperature detection probe 350 and the sample board 500 to be tested and condensing again. The heat insulation performance of the sample board 500 to be tested can be tested by the temperature of the upper end surface of the sample board 500 to be tested measured by the temperature detection probe 350.

[0020] It should be noted that the simulation chamber 210 with the built-in simulation cavity 211 and the detection chamber 220 cooperatively work to quickly and conveniently place the sample board 500 to be tested and encapsulate it in an independent test space. The air with a set humidity and temperature is introduced into the simulation cavity 211 to effectively simulate the real humid and hot environment working condition. In the initial state, the sliding sleeve 310 is extended, the annular flexible capsule 370 is in the radial contraction state, and it wraps and protects the temperature detection probe 350, effectively isolating the probe surface from moisture pollution; during the downward packaging process of the lifting platform 120, the sliding sleeve 310 is pushed back after contacting the to-be-tested sample plate 500 at the lower end, forcing the annular flexible capsule 370 to expand radially and actively scrape off the water film on the upper surface of the to-be-tested sample plate 500, creating a dry contact surface for subsequent temperature measurement. After the water film is scraped off, the sliding sleeve 310 continues to retract, so that the temperature detection probe 350 is completely exposed and automatically tightly attached to the upper surface of the to-be-tested sample plate 500 that has been scraped dry of the water film, ensuring that the temperature detection probe 350 is in a clean and dry state when contacting the measured surface. At the same time, the driving motor 320 drives the rotating shaft 330 to continue rotating, driving the dehumidifying element at the lower end of the rotating shaft 330 to dissipate the moisture in the measured area, preventing the moisture from seeping into the gap between the temperature detection probe 350 and the to-be-tested sample plate 500 and condensing again, thereby improving the accuracy of temperature measurement.

[0021] In an embodiment, referring to Figure 2 and Figure 3 , a guide column 130 is vertically fixed on the mounting table 110, a top plate 140 is fixed at 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, and a sliding rail 160 adapted to sliding of the simulation bin 210 is installed on the mounting table 110; Specifically, the simulation bin 210 can slide horizontally along the sliding rail 160, so as to realize the sliding-in and sliding-out actions of the simulation bin 210, facilitating loading and disassembling of the to-be-tested sample plate 500 on the simulation bin 210; when the simulation bin 210 loaded with the to-be-tested sample plate 500 slides into the detection position in the test cabinet 100 along the sliding rail 160, the simulation bin 210 just reaches directly below the detection bin 220 at this time. The lifting platform 120 is driven by the lifting cylinder 150 to slide vertically downward along the guide column 130 until the detection bin 220 and the simulation bin 210 are mutually buckled, so as to realize packaging of the to-be-tested sample plate 500.

[0022] Further, referring to Figure 6 and Figure 7 , in order to realize automatic extension and retraction of the sliding sleeve 310, a cavity 121 accommodating the sliding sleeve 310 is formed in the lifting platform 120, and a third spring 122 abutting against the upper end of the sliding sleeve 310 is arranged in the cavity 121; Specifically, in the initial state, the sliding sleeve 310 is always sliding out of the cavity 121 due to the elastic force of the third spring 122. When the lower end of the sliding sleeve 310 contacts the upper end surface of the sample plate 500 to be tested, the sliding sleeve 310 can gradually retract into the cavity 121 as the lifting platform 120 further descends, and the third spring 122 is gradually compressed, so that the lower end of the sliding sleeve 310 is always in close contact with the upper end surface of the sample plate 500 to be tested, ensuring the stability of the radial scraping of the water film by the subsequent annular flexible capsule 370.

[0023] It should be noted that the lifting platform 120 is slidingly 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 prevents the deflection during lifting, and ensures that the detection chamber 220 below can be accurately aligned and smoothly buckled on the simulation chamber 210, realizing reliable packaging of the sample plate 500 to be tested and providing a stable basic environment for testing. In the initial state, the elastic force of the third spring 122 pushes the sliding sleeve 310 out of the cavity 121, so that the lower end of the annular flexible capsule 370 wraps and protects the temperature detection probe 350. When the lifting platform 120 descends, the lower end of the sliding sleeve 310 is blocked after contacting the sample plate 500 to be tested, and as the lifting platform 120 continues to descend, the sliding sleeve 310 is forced to retract into the cavity 121 against the elastic force of the third spring 122. In 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 plate 500 to be tested, ensuring that the annular flexible capsule 370 effectively expands radially and stably scrapes the water film in the tested area. In the temperature measurement stage, the sliding sleeve 310 continues to retract to finally expose and stably contact the surface of the sample plate which has been scraped dry.

[0024] In another embodiment, referring to Figure 6 and Figure 8 , for the radial expansion action of the annular flexible capsule 370 at the lower end of the sliding sleeve 310, a plurality of axial sliding grooves 311 and radial sliding grooves 312 are circumferentially formed on the sliding sleeve 310, an axial sliding block 313 abutting against the rotating shaft 330 is slidingly embedded in the axial sliding groove 311, a radial sliding block 314 is slidingly embedded in the radial sliding groove 312, a connecting rod 315 is hinged between the axial sliding block 313 and the corresponding radial sliding block 314, and the annular flexible capsule 370 is sleeved on each group of radial sliding blocks 314. A sleeve rod 316 is horizontally fixed in the radial sliding groove 312, and a first spring 317 abutting against the corresponding radial sliding block 314 is movably sleeved on the sleeve rod 316. Specifically, in the initial state, due to the elastic force of the first spring 317, the radial slider 314 is always located on one side of the radial sliding groove 312 close to the center, so that the radial sliders 314 of each group are gathered together, the annular flexible capsule 370 is in a contracted state and wrapped outside the temperature detection probe 350, and at this time, the radial sliding groove 312 is also located at the top of the axial sliding groove 311 and abuts against the lower end of the rotating shaft 330 under the driving of the connecting rod 315; When the lower end of the sliding sleeve 310 abuts against the upper end surface of the sample plate 500 to be measured, with the continuous downward movement of the lifting platform 120, the sliding sleeve 310 is gradually retracted into the cavity 121, and the axial slider 313 is axially limited by the rotating shaft 330, so that the axial slider 313 cannot move upward synchronously with the lifting platform 120 along with the sliding sleeve 310, thereby making the axial slider 313 gradually slide downward along the corresponding axial sliding groove 311, and 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 sliding groove 312. In this way, the radial slider 314 expanded radially can be used to expand the annular flexible capsule 370, so that the annular flexible capsule 370 is radially expanded to scrape off the water film of the measured area, and at the same time, the temperature detection probe 350 at the center is exposed and closely abuts against the upper end surface of the sample plate 500 to be measured.

[0025] Further, please refer to Figure 6 , Figure 7 and Figure 8 , the dehumidifying member includes a telescopic rod 340 axially slidingly arranged at the lower end of the rotating shaft 330, the rotating shaft 330 is provided with a telescopic cavity 331 accommodating the telescopic rod 340, and a plurality of axial limiting strips 332 slidingly matched with the telescopic rod 340 are arranged on the inner wall of the telescopic cavity 331, and a turbine blade 343 is mounted at the lower end of the telescopic rod 340; The temperature detection probe 350 is axially slidingly sleeved on the sliding sleeve 310, a second spring 351 is arranged between the sliding sleeve 310 and the temperature detection probe 350, and a plurality of through holes 318 are formed in the sliding sleeve 310; Specifically, under the elastic force of the second spring 351, the temperature detection probe 350 is pushed out downward and closely abuts against the upper end surface of the sample plate 500 to be measured after the annular flexible capsule 370 is radially expanded; In the process of retracting the sleeve 310 into the cavity 121, the upper end of the temperature detection probe 350 pushes the telescopic rod 340 upward into the telescopic cavity 331, so as to realize the self-adaptive telescopic adjustment of the telescopic rod 340 relative to the rotating shaft 330; in the process of continuously rotating the rotating shaft 330 driven by the driving motor 320, the telescopic rod 340 can only slide axially relative to the rotating shaft 330 and cannot rotate circumferentially, so as to drive the telescopic rod 340 to rotate synchronously, and then drive the turbine blade 343 to rotate, so as to form a dispersive airflow above the temperature detection probe 350, so as to avoid the condensation phenomenon of the moisture in the test area.

[0026] It should be noted that the telescopic rod 340 at the lower end of the rotating shaft 330 and the turbine blade 343 are driven to rotate synchronously by continuously rotating the rotating shaft 330 driven by the driving motor 320, the turbine blade 343 rotates in the area above the temperature detection probe 350 to generate a directional airflow, which actively disperses the humid air that may be accumulated above the test area, effectively prevents the moisture in the humid environment from condensing again on the surface of the test sample plate 500 after the water film is removed or near the temperature detection probe 350, and ensures that the temperature measuring environment is dry and stable. The telescopic rod 340 is axially slidably arranged in the telescopic cavity 331 at the lower end of the rotating shaft 330, and is slidably fitted 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, thereby ensuring reliable transmission of the rotating power from the rotating shaft 330 to the telescopic rod 340 and the turbine blade 343; in the process of retracting the sleeve 310 into the cavity 121, when the temperature detection probe 350 is lowered to closely contact the sample plate under the elastic force of the second spring 351, the upper end of the temperature detection probe 350 simultaneously pushes the telescopic rod 340 upward into the telescopic cavity 331, thereby realizing the automatic telescopic adjustment of the telescopic rod 340 with the change of the probe position, and ensuring that the turbine blade 343 is always at a reasonable working height. After the annular flexible capsule 370 completes the radial expansion and water scraping, the elastic force of the second spring 351 immediately drives the temperature detection probe 350 to move downward, so that the temperature detection probe 350 is closely and stably attached to the upper surface of the test sample plate 500 that has been scraped dry, thereby providing reliable contact for accurate temperature measurement; the through hole 318 formed in the sleeve 310 ensures that the dispersive airflow generated by the turbine blade 343 can smoothly pass through and cover the test area, thereby avoiding airflow obstruction.

[0027] Further, please refer to Figure 6 , Figure 7 and Figure 8, in order to promote the moisture of the region to be tested, the telescopic rod 340 is provided with a main air duct 341 communicated with the telescopic cavity 331, and a plurality of branch air ducts 342 are arranged on the lower end of the main air duct 341 in a circumferential direction; the upper end surface of the lifting platform 120 is fixed with a gas cover 360, the gas cover 360 is sealingly connected with the rotating shaft 330, and one side of the gas cover 360 is connected with a gas pipe 361; the rotating shaft 330 is provided with a gas cavity 333 communicated with the telescopic cavity 331, and a plurality of gas holes 334 communicated with the gas cover 360 are arranged on the upper circumferential surface of the gas cavity 333; Specifically, while the rotating shaft 330 drives the turbine blade 343 to rotate in a circumferential direction, the gas cover 360 is connected with an external air extraction device through the gas pipe 361, so that the moisture of the region to be tested can flow upwards through the branch air duct 342, the main air duct 341, the telescopic cavity 331 and the gas cavity 333 in sequence, and finally enters the gas cover 360 through the gas hole 334 and is sucked out by the gas pipe 361, so that the moisture of the region to be tested can be continuously and uninterruptedly extracted, and the synchronous operation of the turbine blade 343 is not affected during the dehumidification process.

[0028] In further embodiments, please refer to Figure 9 and Figure 10 The mounting table 110 is further provided with a locking unit 400 matched with the simulation bin 210 and the detection bin 220, the locking unit 400 comprises a locking cylinder 410 fixed on the mounting table 110, the output end of the locking cylinder 410 is connected with a locking plate 420, and one side of the simulation bin 210 and the detection bin 220 is provided with a clamping groove 212 matched with the locking plate 420; Specifically, when the simulation bin 210 is slid to the detection position, the detection bin 220 is lowered and buckled with the simulation bin 210, and then the locking plate 420 is driven by the locking cylinder 410 to horizontally extend, so that the locking plate 420 is just clamped into the clamping groove 212 on the simulation bin 210 and the detection bin 220, thereby the simulation bin 210 and the detection bin 220 are positionally locked by the locking plate 420, so as to avoid the relative sliding of the simulation bin 210 and the detection bin 220 during the test, thereby preventing the damage of the hot and humid simulation environment and ensuring the stability of the test process.

[0029] Further, please refer to Figure 10 and Figure 11In order to construct a humid and hot simulated environment in the simulation chamber 211, an ultrasonic atomizer 230 is provided on the bottom surface of the simulation chamber 211, a turbo spoiler 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 provided in the simulation chamber 211; a circulating air duct 214 is opened in the simulation chamber 210, and a plurality of electric heating meshes 250 are set in the circulating air duct 214; a through groove 213 is opened on the side of the simulation chamber 211 away from the turbo spoiler fan 240, and 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 opened in the locking plate 420; Specifically, after the locking plate 420 is inserted into the card slot 212, the air nozzle 430 on the locking plate 420 is just inserted into the through slot 213, and at the same time, the lower end opening of the connecting air duct 440 is just connected and communicated with the circulating air duct 214, so that a simulation environment independent of the outside is formed in the simulation chamber 211. When the turbo spoiler fan 240 is turned on, the air flow in the simulation chamber 211 can be sucked into the circulating air duct 214, and then returned to the simulation chamber 211 through the circulating air duct 214, the connecting air duct 440 and the air nozzle 430 in sequence. 1, thereby forming a circulating airflow in the simulation chamber 211, and at the same time turning on the ultrasonic atomizer 230 and the electric heating mesh 250, the ultrasonic atomizer 230 can humidify the airflow passing through it, and the electric heating mesh 250 can heat the airflow passing through it, and the temperature and humidity are detected by the temperature sensor 260 and the humidity sensor 270 respectively, until the temperature and humidity of the airflow in the simulation chamber 211 reach the required test standards, the test working condition of the humid heat simulation environment can be realized.

[0030] It should be noted that the turbo spoiler fan 240 is activated to drive the airflow, which circulates through the simulation chamber 211, the circulation air duct 214, the connecting air duct 440 and the air nozzle 430 in sequence and then flows back to the simulation chamber 211, thereby forming an independent closed circulation air duct, forcing the airflow to flow continuously at a high speed in the simulation chamber 211, avoiding temperature and humidity stratification and ensuring the uniformity of the simulation environment; The ultrasonic atomizer 230 atomizes the built-in stored water and then sprays it out, atomizing and humidifying the air flow passing through, with fast response and fine humidity adjustment; multiple groups of electric heating meshes 250 in the circulating air duct 214 heat the air flow in sections, improving heat exchange efficiency and making temperature control more precise; the air flow circulation accelerates the diffusion speed of the moist and hot medium in the simulation cavity 211, shortening the environment construction time, and the electric heating mesh 250 has a built-in circulating air duct 214 to directly heat the flowing air, with low heat loss and low energy consumption; the temperature sensor 260 and the 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 balance of temperature and humidity.

[0031] For further information, see Figure 11, considering that part of water in the airflow inevitably condenses and precipitates during circulation of the airflow in the circulation air channel 214, the circulation air channel 214 is provided with a hydrophobic slope 215 at both ends, and the bottom of the simulation chamber 210 is detachably provided with a water collecting groove 280 in communication with the bottom of the hydrophobic slope 215; Specifically, when the water in the airflow in the circulation air channel 214 condenses and precipitates, the water flow converges into the water collecting groove 280 under the guide of the hydrophobic slope 215, so that the accumulated water can be collected.

[0032] The application further provides a testing method of the automobile coating heat insulation performance testing device. Step one, cover the end face of the sample plate 500 to be tested, which is coated with coating, on the upper end opening of the simulation cavity 211, and then horizontally push the simulation chamber 210 into the detection position in the testing cabinet 100; Step two, the detection chamber 220 descends and is buckled with the simulation chamber 210, and the sample plate 500 to be tested is packaged, and the coating heat insulation performance testing condition under the simulation of the hot and humid environment in the simulation cavity 211 is simulated. Step three, gradually retract the sliding sleeve 310 into the lifting platform 120, drive the annular flexible capsule 370 on the sliding sleeve 310 to gradually expand radially, scrape off the water film in the tested area, and at the same time, the temperature detection probe 350 is exposed and adheres to the upper end face of the sample plate 500 to be tested. Step four, drive the motor 320 to drive the rotating shaft 330 and the dehumidifying piece to continuously disperse the moisture in the tested area, and measure the temperature of the upper end face of the sample plate 500 to be tested by the temperature detection probe 350, so as to test the heat insulation performance of the sample plate 500 to be tested.

[0033] The specific embodiments of the application are described above, but the application is not limited to the above specific embodiments, and the above specific embodiments are only illustrative but not limiting, and those skilled in the art can make many forms under the inspiration of the application, which all belong to the protection of the application.

Claims

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

2. The automotive coating thermal insulation performance testing device according to claim 1, characterized in that: A guide column (130) is vertically fixed on the mounting platform (110), 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), and a slide rail (160) that is slidably adapted to the simulation chamber (210) is installed on the mounting platform (110).

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

4. The thermal insulation performance testing device for automobile coatings according to claim 3, characterized in that: The sliding sleeve (310) is provided with a plurality of axial sliding grooves (311) and radial sliding grooves (312) in the circumferential direction. An axial sliding block (313) is slidably embedded in the axial sliding groove (311) and is in contact with the rotating shaft (330). A radial sliding block (314) is slidably embedded in the radial sliding groove (312). A connecting rod (315) is hinged between the axial sliding block (313) and the corresponding radial sliding block (314). The annular flexible capsule (370) is sleeved on each group of radial sliding blocks (314). A sleeve rod (316) is horizontally fixed in the radial sliding groove (312). A first spring (317) is movably sleeved on the sleeve rod (316) and is in contact with the corresponding radial sliding block (314).

5. The automotive coating thermal insulation performance testing device according to claim 1, characterized in that: The dehumidifying element comprises a telescopic rod (340) axially slidably arranged at the lower end of the rotating shaft (330); a telescopic cavity (331) for accommodating the telescopic rod (340) is provided in the rotating shaft (330); a plurality of axial limiting strips (332) slidably adapted to the telescopic rod (340) are circumferentially arranged in the telescopic cavity (331); and a turbine blade (343) is mounted at the lower end of the telescopic rod (340); The temperature detection probe (350) is axially slidably sleeved on the sleeve (310), a second spring (351) is provided between the sleeve (310) and the temperature detection probe (350), and a plurality of through holes (318) are provided on the sleeve (310).

6. The automotive coating thermal insulation performance testing device according to claim 5, characterized in that: A main air channel (341) communicating with the telescopic cavity (331) is provided in the telescopic rod (340), and a plurality of branch air channels (342) are provided circumferentially at the lower end of the main air channel (341); an air hood (360) is fixed to the upper end surface of the lifting platform (120), the air hood (360) is sealedly connected to the rotating shaft (330), and an air pipe (361) is connected to one side of the air hood (360); an air cavity (333) communicating with the telescopic cavity (331) is provided in the rotating shaft (330), and an air hole (334) communicating with the air hood (360) is provided circumferentially on the air cavity (333).

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

8. The automotive coating thermal 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 spoiler 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 provided in the simulation chamber (211); a circulating air duct (214) is provided in the simulation chamber (210), and a plurality of electric heating meshes (250) are provided in the circulating air duct (214); a through groove (213) is provided on the side of the simulation chamber (211) away from the turbine spoiler 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 in the locking plate (420).

9. The automotive coating thermal insulation performance testing device according to claim 8, characterized in that: Hydrophobic slopes (215) are respectively provided at both ends of the circulating air channel (214), and a water receiving trough (280) in communication with the bottom of the hydrophobic slope (215) is detachably mounted at the bottom of the simulation chamber (210).

10. A method for testing the thermal insulation performance of automotive coatings using the device for testing the thermal insulation performance of automotive coatings according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Place the end of the sample to be tested (500) coated with the coating downwardly on the upper opening of the simulation chamber (211), and then push the simulation chamber (210) horizontally into the testing position in the test cabinet (100); Step 2: The detection chamber (220) is downwardly engaged with the simulation chamber (210), and the sample plate (500) to be tested is encapsulated, while the thermal insulation performance test conditions of the coating under a humid and hot environment are simulated in the simulation chamber (211); Step 3: The sliding sleeve (310) is gradually retracted into the lifting platform (120), driving the annular flexible capsule (370) on the sliding sleeve (310) to gradually expand radially, scraping off the water film in the area to be tested, and at the same time, the temperature detection probe (350) is exposed and attached to the upper end surface of the sample to be tested (500); Step 4: The driving motor (320) drives the rotating shaft (330) and the dehumidifying element to continuously dissipate the moisture in the test area, and the temperature of the upper end surface of the test sample (500) is measured by the temperature detection probe (350) to test the thermal insulation performance of the test sample (500).

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