CN115773844A - Air tightness detection device and detection method for body-in-white - Google Patents
Air tightness detection device and detection method for body-in-white Download PDFInfo
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Abstract
The invention relates to an air tightness detection device and a detection method for a white vehicle body, wherein a white vehicle body is sealed by a black organic glass plate and the white vehicle body through a sealant to form a sealed white vehicle body cavity, a test bed frame can drive the white vehicle body cavity to lift and rotate so as to facilitate an infrared thermal imager to acquire infrared images of different angles of the outer surface of the white vehicle body cavity, the temperature and the infrared radiation intensity in the white vehicle body sealed cavity are improved through an infrared heater, the infrared thermal imager is used for acquiring the infrared images of the outer surface of the white vehicle body cavity, the leakage position is rapidly positioned according to the image change, an analysis system evaluates the sealing effect by calculating the infrared radiation intensity and the temperature change in the white vehicle body cavity within a certain time, the leakage position of the white vehicle body can be rapidly and accurately found by utilizing the principles of infrared radiation and infrared thermal imaging, the sealing performance of the white vehicle body can be detected, relevant parameters can be directly obtained, and the air tightness of the white vehicle body can be ensured.
Description
Technical Field
The invention relates to the field of automobile part detection, in particular to a device and a method for detecting air tightness of a body in white.
Background
With the rapid development of the automobile industry and the continuous improvement of the living standard of people, consumers pay more and more attention to the comfort and NVH performance of passenger cars. The air tightness of the body-in-white has important influence on the performance of the whole vehicle, the improvement of the air tightness of the body-in-white can reduce the noise in the vehicle, improve the heat energy management and the waterproof and dustproof performance, prolong the service life of the whole vehicle and meet the driving and riding requirements of users. At present, the sealing performance of a body-in-white is mainly detected by an air-tightness test. The test for detecting the air tightness of the body in white can be divided into a positive pressure method and a negative pressure method in principle. The positive pressure method is to fill air into the cavity of the body-in-white to make the air pressure inside the vehicle higher than the air pressure outside the vehicle, calculate the leakage amount of the body-in-white by analyzing the air inflow and the condition of the pressure inside the vehicle, and then judge the leakage position by the smoke generator. Whereas the negative pressure law is the opposite.
The positive pressure method and the negative pressure method based on the pressure difference are mainstream test methods of various automobile manufacturers at present. However, the method is complicated to operate, and a large amount of preliminary preparation work is required; in the process of forming positive pressure or negative pressure in the body-in-white cavity, the consumed time is long; when the smoke generator is used for judging the leakage position, the efficiency is low, and tiny leakage points are easy to miss; the requirement on the accuracy of the sensor is high. Therefore, a simple, accurate and efficient white body airtightness detection device and detection method are needed.
Disclosure of Invention
In order to overcome the defects in the background art, the invention provides the air tightness detection device and the air tightness detection method for the body-in-white, the air tightness detection device and the air tightness detection method for the body-in-white can quickly find the leakage position of the body-in-white, accurately evaluate the sealing effect of glue coating, welding seams, partition blocks, sealing fillers and the like of the body-in-white in a lap joint area, and have the advantages of simple structure, convenience in operation, high detection efficiency, high precision and the like.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the utility model provides an air tightness detection device for white automobile body, includes analytic control system, infrared heater, infrared thermal imaging appearance, infrared ray sensor, black organic glass board and test bench be equipped with the bottom plate in the test bench rotary mechanism's the higher authority be equipped with elevating system, be equipped with white automobile body on the mounting panel in elevating system, be equipped with black organic glass board respectively around the both sides of white automobile body on door, front windshield glass and the tail-gate glass window and make the inner chamber of white automobile body form a inclosed cavity sets up infrared heater and infrared ray sensor respectively, infrared heater and infrared ray sensor's transmission data line passes the outside analytic control system of black organic glass board upper seal connecting hole connection white automobile body, sets up a plurality of infrared thermal imaging appearance in the test bench frame, and a plurality of infrared thermal imaging appearance connect analytic control system through the transmission data line respectively, analytic control system connects the motor in the rotary mechanism and the hydraulic pressure post form through the transmission data line respectively an air tightness detection device for white automobile body.
The air tightness detection device for the body-in-white comprises a rotating mechanism, a support column, a worm wheel, a worm, a bearing base, a motor and a fixed support column, wherein the fixed support column is arranged on the ground, the worm is arranged on the fixed support column, the end part of the worm is connected with the motor, the motor is respectively connected with a power supply and an analysis control system, the worm is meshed with the worm wheel, the worm wheel is arranged on the bearing base, a plurality of support columns are arranged on the worm wheel, and a plurality of support columns are connected with a bottom plate.
The air tightness detection device for the body-in-white is characterized in that the fixed support column is arranged on the ground through a bolt.
The air tightness detection device for the white automobile body is characterized in that the lifting mechanism comprises four hydraulic columns and a mounting plate, the four hydraulic columns are respectively arranged at four corners of the upper surface of the bottom plate, hydraulic rods of the four hydraulic columns are respectively connected with four corners of the lower surface of the mounting plate, and the four hydraulic columns are respectively connected with the analysis control system.
The air tightness detection device for the white automobile body is characterized in that the infrared heater comprises an infrared heating pipe and an infrared heater support, and the two ends of the infrared heating pipe are respectively provided with the infrared heater support.
The air tightness detection device for the white vehicle body is characterized in that the black organic glass plates are connected with front and rear doors, front windshield glass and rear door glass windows on two sides of the white vehicle body through sealing glue.
The middle part of the upper surface of the bottom plate is provided with an infrared thermal imager, and the infrared thermal imager is connected with an analysis control system through a transmission data line.
The air tightness detection device for the white car body is characterized in that a sliding guide rail is arranged on the inner side of the test bed frame, and an infrared thermal imager is arranged on the sliding guide rail.
A detection method for the air tightness of a body-in-white specifically comprises the following steps:
firstly, manufacturing black organic glass plates with the shapes consistent with the shapes of front and rear doors, front windshield glass and rear door glass windows on two sides of a body-in-white to be detected according to the body-in-white to be detected;
secondly, placing the infrared heater and the infrared sensor in a body-in-white and connecting a transmission data line of the infrared heater and the infrared sensor to an external analysis control system through a sealed connecting hole of a black organic glass plate at a vehicle door;
thirdly, the black organic glass plates are respectively connected with front and rear vehicle doors, front windshield glass and rear door glass windows on the two sides of the body-in-white in a sealing way by using sealant, and the rest installation holes, coating process holes, positioning holes, drain holes, process via holes and lightening holes which are communicated with the inside and the outside of the body-in-white are sealed, so that a sealed cavity is formed inside the body-in-white;
fourthly, respectively installing a plurality of infrared thermal imaging cameras on a test bed frame of the test bed frame, wherein the plurality of infrared thermal imaging cameras are distributed at fixed positions around the white body and are connected with an analysis control system;
fifthly, controlling the infrared heater and the infrared sensor by the analysis control system, and when the temperature and the infrared radiation intensity in the body-in-white cavity reach preset values, closing the infrared heater and recording the time, the temperature and the radiation intensity;
sixthly, rotating the test bed for placing the body-in-white according to a preset direction, controlling the infrared thermal imager to shoot once when rotating the test bed by a preset angle by the analysis control system, controlling the test bed to lift, repeatedly rotating and shooting to obtain infrared images with different heights and directions, and sending the shot infrared images to the analysis control system for identification and analysis;
seventhly, when the air tightness of the body-in-white does not meet the standard, extracting a temperature singular point or area by the analysis control system 2, and determining the leakage position of the body-in-white;
eighthly, controlling the test bench to rotate, enabling the body-in-white leakage position to be clearly reflected in the shooting range of the infrared thermal imager, starting video recording and fast shooting, and accurately positioning the body-in-white leakage position;
ninthly, according to preset time, carrying out analysis and calculation by an analysis control system according to the infrared image, the infrared radiation intensity value and the temperature value which are transmitted in real time, focusing on the difference value between the infrared radiation intensity value in the body-in-white and the radiation intensity value after the infrared heater is turned off, and obtaining the leakage rate of the body-in-white;
and tenth, if the air tightness of the body-in-white does not meet the standard, detecting the leakage reason of the body-in-white leakage position, resealing the body-in-white leakage position after the leakage reason is ascertained, and returning to the fifth step to start detection again until the air tightness of the body-in-white meets the standard.
According to the air tightness detection method for the body-in-white, when the leakage reasons of the body-in-white leakage position are explored in the tenth step, if the outer surface of a body-in-white cavity which is not easy to detect exists in an infrared thermal imager arranged on the test bed frame, the handheld infrared thermal imager is adopted for accurate detection.
By adopting the technical scheme, the invention has the following advantages:
according to the invention, a sealed white body cavity is formed by sealing a white body through a sealant, an infrared heater and an infrared sensor are positioned in the white body cavity, a test bench can drive the white body cavity to lift and rotate so as to facilitate an infrared thermal imager to acquire infrared images of different angles of the outer surface of the white body cavity, the temperature and the infrared radiation intensity in the white body sealed cavity are improved through the infrared heater, the infrared thermal imager is used for acquiring the infrared images of the outer surface of the white body cavity, the leakage position is rapidly positioned according to the image change, and an analysis system evaluates the sealing effect by calculating the infrared radiation intensity and the temperature change in the white body cavity within a certain time.
Drawings
FIG. 1 is an operation flow chart of a body-in-white air tightness detection method in an embodiment of the invention;
FIG. 2 is a schematic perspective view of a body-in-white air tightness detection device according to an embodiment of the present invention;
FIG. 3 is a schematic front view of the body-in-white air tightness detection device in the embodiment of the present invention;
FIG. 4 is a schematic view of the air tightness detecting device for body in white in the embodiment of the present invention;
FIG. 5 is a schematic perspective view of an infrared heater according to an embodiment of the present invention;
FIG. 6 is a schematic perspective view of a rotary mechanism of the present invention;
FIG. 7 is a schematic view of the installation of the sliding guide of the present invention;
in the figure: 1. a body-in-white; 2. an analysis control system; 3. a support column; 4. an infrared heater; 5. an infrared thermal imager; 6. an infrared sensor; 7. an infrared heating pipe; 8. an infrared heater support; 9. a black organic glass plate; 10. a worm gear; 11. a hydraulic column; 12. a worm; 13. a test bed; 14. mounting a plate; 15. sealing glue; 16. a bearing mount; 17. a motor; 18. a bolt; 19. fixing a strut; 20. a test bed frame; 21. a base plate; 22. sealing the connecting hole; 23. a sliding guide rail.
Detailed Description
The present invention will be explained in more detail by the following examples, which are not intended to limit the invention;
the air tightness detection device for the white car body comprises an analysis control system 2, an infrared heater 4, an infrared thermal imager 5, an infrared sensor 6, a black organic glass plate 9 and a test bench 13, wherein a bottom plate 21 is arranged above a rotating mechanism in the test bench 13, a lifting mechanism is arranged above the bottom plate 21, a white car body 1 is arranged above a mounting plate 14 in the lifting mechanism, the black organic glass plate 9 is respectively arranged on front and rear car doors, front windshield glass and rear door glass windows on two sides of the white car body 1 to enable an inner cavity of the white car body 1 to form a closed cavity, the infrared heater 4 and the infrared sensor 6 are respectively arranged in the closed cavity, and the test bench 13 can drive the white car body cavity to lift and rotate so that the infrared thermal imager 5 can acquire infrared images of different angles on the outer surface of the white car body cavity; the transmission data lines of the infrared heater 4 and the infrared sensor 6 penetrate through a sealing connecting hole 22 in a black organic glass plate 9 to be connected with an analysis control system 2 outside a white vehicle body 1, a plurality of infrared thermal imagers 5 are arranged on a test bench frame 20 in a test bench 13, the plurality of infrared thermal imagers 5 are distributed at fixed positions around the white vehicle body 1 and are used for shooting the white vehicle body 1 to obtain infrared images, the plurality of infrared thermal imagers 5 are respectively connected with the analysis control system 2 through transmission data lines, the analysis control system 2 is provided with a display screen and is used for controlling the radiation intensity and the temperature in the white vehicle body cavity and analyzing the transmitted back temperature, infrared radiation intensity and infrared images to determine the leakage position and the leakage rate of the white vehicle body cavity, and the analysis control system 2 is respectively connected with a motor 17 in a rotating mechanism and a hydraulic vehicle body column 11 in a lifting mechanism through the transmission data lines to form the air tightness detection device for the white vehicle.
As shown in fig. 2, 3 and 6, the rotating mechanism includes a supporting column 3, a worm wheel 10, a worm 12, a bearing base 16, a motor 17 and a fixed supporting column 19, the fixed supporting column 19 is disposed on the ground, in implementation, the fixed supporting column 19 is disposed on the ground through a bolt 18, the worm 12 is disposed on the fixed supporting column 19, an end of the worm 12 is connected to the motor 17, the motor 17 is respectively connected to a power supply and an analysis control system 2, the worm 12 is meshed with the worm wheel 10, the worm wheel 10 is disposed on the bearing base 16, a plurality of supporting columns 3 are disposed on the worm wheel 10, and the plurality of supporting columns 3 are connected to a bottom plate 21. In operation, the fixing support 19 is used for supporting the worm 12, the worm 12 is driven by the motor 17 and transmits power to the worm wheel 10, the lower surface of the worm wheel 10 is connected with the bearing base 16, and the upper surface of the worm wheel 10 is connected with the bottom plate 21 through the support column 3.
As shown in fig. 2 and 3, the lifting mechanism includes four hydraulic columns 11 and a mounting plate 14, the four hydraulic columns 11 are respectively disposed at four corners of the upper surface of the bottom plate 21, hydraulic rods of the four hydraulic columns 11 are respectively connected to four corners of the lower surface of the mounting plate 14, the four hydraulic columns 11 are respectively connected to the analysis control system 2, an infrared thermal imager 5 is disposed in the middle of the upper surface of the bottom plate 21, and the infrared thermal imager 5 is connected to the analysis control system 2 through a data transmission line.
In implementation, the four corners of the upper surface of the bottom plate 21 are respectively fixed with the hydraulic columns 11, the middle part of the upper surface is provided with the infrared thermal imager 5, the hydraulic columns 11 are connected with the mounting plate 14, and the mounting plate 14 is used for placing the body-in-white 1.
As shown in fig. 4 and 5, the infrared heater 4 includes an infrared heating pipe 7 and an infrared heater bracket 8, and the infrared heater bracket 8 is respectively disposed at two ends of the infrared heating pipe 7. In implementation, the shape and size of the infrared heating pipe 7 are selected in combination with the actual infrared heater bracket 8, so that the temperature and the infrared radiation intensity in the body-in-white cavity reach preset values.
As shown in fig. 2 and 3, the black organic glass plate 9 is connected with the front and rear doors, the front windshield glass and the rear door glass window on the two sides of the white car body 1 through the sealant 15.
As shown in fig. 2, 3 and 7, the inside of the test bed frame 20 is provided with a slide rail 23, and the thermal infrared imager 5 is disposed on the slide rail 23. During implementation, the sliding guide rail 23 is connected with the infrared thermal imager 5 in a sliding manner, so that the test bed and the sliding guide rail can be controlled to move simultaneously, and the efficiency of shooting infrared images of the outer surface of the cavity of the body-in-white from all angles by the infrared thermal imager 5 is improved.
A method for detecting the air tightness of a body in white is shown in the attached figure 1, and specifically comprises the following steps:
firstly, manufacturing black organic glass plates 9 with the shapes consistent with the shapes of front and rear doors, front windshield glass and rear door glass windows on two sides of a body-in-white 1 to be detected according to the body-in-white 1 to be detected;
secondly, placing an infrared heater 4 and an infrared sensor 6 in the body-in-white 1 and connecting a transmission data line of the infrared heater and the infrared sensor to an external analysis control system 2 through a sealed connecting hole of a black organic glass plate 9 at a vehicle door;
thirdly, the black organic glass plates 9 are respectively connected with front and rear vehicle doors, front windshield glass and rear door glass windows on the two sides of the body-in-white 1 through sealant 15 in a sealing manner, and the rest installation holes, coating process holes, positioning holes, drain holes, process via holes and lightening holes which are communicated with the inside and the outside of the body-in-white 1 are sealed, so that a sealed cavity is formed inside the body-in-white 1;
fourthly, respectively installing a plurality of infrared thermal imaging cameras 5 on a test bench frame 20 of a test bench 13, wherein the plurality of infrared thermal imaging cameras 5 are distributed at fixed positions around the white automobile body 1 and are connected with the analysis control system 2;
fifthly, the analysis control system 2 controls the infrared heater 4 and the infrared sensor 6, when the temperature and the infrared radiation intensity in the body-in-white cavity reach preset values, the infrared heater 4 is turned off, and the time, the temperature and the radiation intensity are recorded;
sixthly, the test bench 13 for placing the body-in-white 1 rotates according to a preset direction, the analysis control system 2 controls the infrared thermal imaging instrument 5 to shoot once when rotating for a preset angle, controls the test bench 13 to lift, repeatedly rotates and shoots to obtain infrared images with different heights and directions, and sends the shot infrared images to the analysis control system 2 for identification and analysis;
seventhly, when the air tightness of the body-in-white 1 does not meet the standard, extracting a temperature singular point or area by the analysis control system 2, and determining the leakage position of the body-in-white 1;
eighthly, controlling the test bed frame 13 to rotate, enabling the leakage position of the body-in-white 1 to clearly reflect in the shooting range of the infrared thermal imager 5, starting video recording and fast shooting, and accurately positioning the leakage position of the body-in-white 1;
ninthly, according to preset time, the analysis control system 2 carries out analysis and calculation according to the infrared image, the infrared radiation intensity value and the temperature value which are transmitted in real time, and focuses on the difference value between the infrared radiation intensity value in the body-in-white 1 and the radiation intensity value after the infrared heater 4 is turned off, so that the leakage rate of the body-in-white 1 is obtained;
tenth, if the air tightness of the body-in-white 1 does not meet the standard, detecting the leakage reason of the leakage position of the body-in-white 1, resealing the leakage position of the body-in-white 1 after the leakage reason is detected, and returning to the fifth step to start detection again until the air tightness of the body-in-white 1 meets the standard;
during implementation, when revealing the reason and exploring to the body in white 1 position, if there is the body in white cavity surface of difficult surveying in infrared thermal imager 5 that sets up on test bench frame 20, adopt the accurate detection of handheld infrared thermal imager to further improve and detect the precision.
The principle of the white vehicle body airtightness detection method is as follows: infrared rays are ubiquitous, and as long as an object with a temperature higher than absolute zero degree radiates infrared rays due to molecular motion of the object. From the basic theory of infrared thermal radiation and analysis of leakage heat transfer, it is known that the magnitude of infrared radiation is mainly dependent on temperature, and the radiation is stronger at higher temperatures. Therefore, the temperature and the infrared radiation intensity in the white body cavity can be actively enhanced, the temperature distribution of the outer surface of the white body cavity is checked by using an infrared thermal imager, the reflection spectrum of the surface of the white body is collected, the leakage area of the white body is positioned, the difference value of the infrared radiation intensity in the white body cavity before and after a certain time is analyzed, and the sealing effect is evaluated.
If the body-in-white air tightness does not meet the standard, two heat transfer processes mainly occur at the leakage position: firstly, due to the temperature difference between the inside and the outside of the body-in-white cavity, the convection heat transfer can occur at the body-in-white leakage part. Secondly, leakage gaps existing in different areas of the body-in-white can be regarded as throttling openings, and Joule-Thomson effect can occur at the leakage part of the body-in-white. The infrared heater is placed in the body-in-white cavity to have two functions, namely, the infrared heater generates infrared radiation and reaches preset intensity in the body-in-white cavity, and the body-in-white sealing effect is convenient to analyze. And secondly, the temperature in the white automobile body cavity is heated, the temperature is increased and the air expands by utilizing the characteristic of expansion caused by heat and contraction caused by cold of the air, and the air pressure in the white automobile body cavity is increased to force the air to flow outwards from the gap. Meanwhile, the leakage position of the body-in-white can generate Joule-Thomson effect, the convection heat transfer at the leakage position is intensified, and the detection precision is improved.
In the specific implementation of the invention, the white car body is sealed by the black organic glass plate 9 and the white car body 1 through the sealant 15 to form a closed white car body cavity. The infrared heater 4 and the infrared sensor 6 are located in the cavity of the body-in-white 1. The test bench 13 can drive the white body cavity to lift and rotate so that the infrared thermal imager 5 can acquire infrared images of different angles of the outer surface of the white body cavity;
the test bed 13 is mainly used for driving the body-in-white to rotate and lift so as to facilitate the infrared thermal imaging instrument 5 to acquire infrared images of the body-in-white 1 at different heights and directions; meanwhile, the sealing operation of the bottom of the body-in-white 1 is facilitated, and the leakage degree of the bottom is detected and analyzed;
furthermore, an endoscope can be arranged in the body-in-white cavity and used for checking the states of the lap joint structure and the partition block in the body-in-white cavity.
A sliding guide rail 23 is arranged on a frame of a test bed frame 20 of the test bed 13, and the sliding guide rail 23 is connected with the infrared thermal imager 5 in a sliding mode. The analysis control system 2 controls the test bench 13 and the sliding guide rail 23 at the same time, and the efficiency of the infrared thermal imager 5 for acquiring the infrared images of the outer surface of the white car body from all angles is improved.
The overlap joint of white automobile body 1, the region that becomes certain angle uses under the difficult circumstances of surveying of above-mentioned device, with the accurate detection of handheld infrared thermal imager, further improves and detects the precision.
The specific embodiment of the invention is as follows:
with reference to fig. 1 to 4, the method for rapidly detecting the air tightness of the body in white according to the embodiment of the invention comprises the following steps: according to the body-in-white 1 to be measured, black organic glass plates 9 are manufactured, wherein the shapes of the black organic glass plates are consistent with those of front and rear doors, front windshield glass and rear door glass windows on the two sides of the body-in-white 1. Before the body-in-white 1 is sealed, the infrared heater 4 and the infrared sensor 6 are placed at predetermined positions in the body-in-white 1 and the transmission data lines thereof are connected to the external analysis control system 2 through the sealed connection hole 22 of the black perspex panel 9 at the door.
And the black organic glass plates 9 are respectively connected with the front and rear vehicle doors, the front windshield glass and the rear door glass windows on the two sides of the body-in-white 1 in a sealing manner by using sealing glue 15. And sealing the rest through holes of the body-in-white 1, such as the mounting holes, the coating process holes, the positioning holes, the drain holes, the process through holes, the lightening holes and the like which are communicated with the inside and the outside to form a closed body-in-white cavity.
The infrared thermal imaging cameras 5 are arranged on a frame 20 of the test bed 13, distributed at fixed positions around the body-in-white 1 and connected with the analysis control system 2, and are required to be debugged before detection so as to reach an optimal detection state. The infrared heater 4, the infrared sensor 6 and the infrared thermal imager 5 are required to be appropriately selected, otherwise, not only the detection cost may be increased or the detection effect may be affected but also an unacceptable measurement error may be caused.
The analysis control system 2 controls the infrared heater 4, the infrared sensor 6 and the infrared thermal imager 5 to start working at the same time, and records detection time, temperature, radiation intensity and infrared images in real time. The infrared heater 4 can be closed when the preset temperature and infrared radiation intensity are reached in the cavity of the body-in-white 1, so that conditions are created for the analysis control system 2 to compare and analyze the change of the preset temperature and infrared radiation intensity in the cavity of the body-in-white 1.
And controlling the test bench 13 for placing the cavity of the body-in-white 1 to rotate according to a preset direction, wherein the analysis control system 2 controls the infrared thermal imaging camera 5 to shoot once every time the test bench rotates for a preset angle (generally not more than 20 degrees). After the test bed 13 rotates for a circle at the set height, the test bed 13 is controlled to ascend to the designated height, the rotation shooting is repeated, infrared images with different heights and directions are obtained, and the shot infrared images are sent to the analysis control system 2 for identification and analysis.
When the air tightness of the body-in-white 1 does not meet the standard, a singular point or an area inevitably exists in the fed back temperature field image, and the analysis control system 2 extracts the temperature singular point or the area, so that the leakage position of the body-in-white 1 can be determined. And then the analysis control system 2 immediately sends an instruction to enable the test bench 13 to drive the body-in-white 1 to rotate to the leakage position, so that the leakage position can be clearly reflected in the shooting range of the infrared thermal imager 5, video recording and shooting are started, and the leakage position of the body-in-white 1 is accurately positioned.
And the analysis control system 2 stores and records the infrared image, the infrared radiation intensity value and the temperature value which are transmitted back in real time. After the time is set, the infrared radiation intensity and the temperature in the cavity of the body-in-white 1 are naturally reduced to preset values, the analysis control system 2 carries out calculation and analysis according to various collected data, and the leakage rate of the body-in-white 1 is output.
And if the air tightness of the body-in-white 1 does not meet the standard, detecting the leakage reason of the body-in-white 1 at the leakage position. Meanwhile, if the surface of the cavity of the body-in-white 1 which is not easy to detect by using the device exists, a handheld infrared thermal imager is adopted for accurate detection. And after the leakage reason is ascertained, resealing the leakage position of the body-in-white 1, and detecting again until the air tightness of the body-in-white 1 meets the standard.
The detection environment and personnel greatly influence the detection accuracy. Corresponding shielding measures must be taken for the detection environment to reduce the influence of absorption of the atmosphere, reflection and slow reflection of light, air flow, dust and suspended particles in the atmosphere, and heat radiation of surrounding objects on infrared image acquisition. The detection personnel need to be skilled in using the detection equipment and can accurately adjust the instrument according to the emissivity and the actual distance of the body-in-white material.
The white body airtightness detection method based on the infrared radiation and infrared thermal imaging principle is realized by detecting the difference between the temperature at the leakage position of the white body 1 and the ambient temperature. When gas exchange occurs inside and outside the body-in-white 1 cavity, the temperature at the leakage position changes, and different color changes are reflected in the infrared chart. And controlling the infrared heater 4 to analyze the detection result difference and the detection efficiency under the condition that the temperature and the infrared radiation intensity in the cavity of the body-in-white 1 reach different values, and determining the optimal detection parameters.
When the infrared thermal imager 5 shoots infrared images of the outer surface of the cavity of the body-in-white 1 in different directions, the analysis control system 2 controls the test bench 13 to drive the cavity of the body-in-white 1 to rotate in a preset direction (generally, the angle is not more than 20 degrees). The transmission path is that the motor 17 works to drive the worm 12 to drive the worm wheel 10 to transmit power to the bottom plate 21 through the supporting column 3, and the bottom plate 21, the hydraulic column 11, the mounting plate 14 and the body-in-white 1 rotate together. When the test bench 13 goes up and down, the length of the hydraulic rod 11 is changed to drive the mounting plate 13 connected with the hydraulic rod and the body-in-white 1 on the mounting plate to go up and down together.
The infrared heater 4 comprises a support 8 and an infrared heating pipe 7, the shape and the size of the infrared heating pipe 7 are selected by combining the actual support 8, the annular infrared heating pipe 7 is arranged on the cylindrical part of the support, and the 3/4 annular infrared heating pipe 7 is arranged on the bottom surface of the cylinder and is used for enabling the temperature and the infrared radiation intensity of each part in the cavity of the body-in-white 1 to quickly reach preset values.
The infrared thermal imaging cameras 5 are arranged on the frame of the test bed 13, distributed at fixed positions around the body-in-white 1, used for shooting the body-in-white 1 to obtain infrared images, and connected with the analysis control system 2.
The infrared heater 4, the infrared sensor 6 and the infrared thermal imager 5 are respectively connected with the analysis control system 2. The analysis control system 2 is provided with a display screen and is used for controlling the radiation intensity and the temperature in the cavity of the body-in-white 1, analyzing the transmitted temperature, the infrared radiation intensity and the infrared image and determining the leakage position and the leakage rate of the cavity of the body-in-white 1.
Compared with the prior art, the invention has the beneficial effects that:
1. the infrared heater of the white body air tightness detection device can enable the temperature and the infrared radiation intensity in the white body cavity to reach the preset values in a short time, saves time for an infrared thermal imager to acquire infrared images of the outer surface of the white body cavity, analyzes and controls the system to detect the temperature and the infrared radiation intensity change, and improves the detection efficiency.
2. The test bench of the white body air tightness detection device can drive the white body cavity to lift and rotate so that the infrared thermal imaging instrument can obtain infrared images of different angles of the outer surface of the white body cavity, and devices for lifting and rotating the white body cavity do not need to be designed respectively.
3. The white body air tightness detection device provided by the invention has the advantages that the structure is simple, the operation is convenient and fast, the detection is comprehensive, and tiny leakage points are not easy to miss when the white body air tightness does not meet the standard and the infrared image of the outer surface of the white body cavity is collected by combining the handheld infrared thermal imager.
4. According to the white vehicle body air tightness detection method and device, the principles of infrared radiation and infrared thermal imaging are utilized, the leakage position of the white vehicle body can be quickly and accurately found, the sealing performance of the white vehicle body can be detected, relevant parameters can be directly obtained, and the white vehicle body air tightness is guaranteed.
The invention is not described in detail in the prior art.
The embodiments chosen for the purpose of disclosure of the invention are presently considered to be suitable, however, it is to be understood that the invention is intended to cover all variations and modifications of the embodiments which fall within the spirit and scope of the invention.
Claims (10)
1. The utility model provides an air tightness detection device for white automobile body, includes analysis control system (2), infrared heater (4), infrared thermal imager (5), infrared ray sensor (6), black organic glass board (9) and test bench (13), characterized by: the test bench is characterized in that a bottom plate (21) is arranged on a rotating mechanism in the test bench (13), a lifting mechanism is arranged on the bottom plate (21), a body-in-white (1) is arranged on a mounting plate (14) in the lifting mechanism, black organic glass plates (9) are respectively arranged on front and rear vehicle doors, front windshield glass and rear door glass windows on two sides of the body-in-white (1) to enable an inner cavity of the body-in-white (1) to form a closed cavity, an infrared heater (4) and an infrared sensor (6) are respectively arranged in the closed cavity, transmission data lines of the infrared heater (4) and the infrared sensor (6) penetrate through a sealing connecting hole (22) in the black organic glass plate (9) to be connected with an analysis control system (2) outside the body-in-white (1), a plurality of infrared thermal imaging meters (5) are arranged on a test bench framework (20) in the test bench (13), the infrared thermal imaging meters (5) are respectively connected with the analysis control system (2) through transmission data lines, and the analysis control system (2) is respectively connected with a motor (17) in the rotating mechanism through the transmission data lines and a hydraulic column (11) in the lifting mechanism to form an air tightness detection device for the vehicle body.
2. The airtightness detection apparatus for a body-in-white according to claim 1, wherein: rotary mechanism includes support column (3), worm wheel (10), worm (12), bearing base (16), motor (17) and fixed stay (19), fixed stay (19) set up subaerial, are equipped with worm (12) on fixed stay (19), the end connection motor (17) of worm (12), power and analysis control system (2) are connected respectively in motor (17), worm (12) and worm wheel (10) meshing, worm wheel (10) set up on bearing base (16), are equipped with a plurality of support columns (3) on worm wheel (10), and bottom plate (21) is connected in a plurality of support columns (3).
3. The air-tightness detecting device for body-in-white according to claim 2, wherein: the fixed support column (19) is arranged on the ground through a bolt (18).
4. The air-tightness detecting device for body-in-white according to claim 1, wherein: the lifting mechanism comprises four hydraulic columns (11) and a mounting plate (14), the four hydraulic columns (11) are respectively arranged at four corners of the upper surface of the bottom plate (21), hydraulic rods of the four hydraulic columns (11) are respectively connected with four corners of the lower surface of the mounting plate (14), and the four hydraulic columns (11) are respectively connected with the analysis control system (2).
5. The air-tightness detecting device for body-in-white according to claim 1, wherein: the infrared heater (4) comprises an infrared heating pipe (7) and an infrared heater support (8), and the two ends of the infrared heating pipe (7) are respectively provided with the infrared heater support (8).
6. The air-tightness detecting device for body-in-white according to claim 1, wherein: the black organic glass plate (9) is connected with front and rear doors, front windshield glass and rear door glass windows on two sides of the white car body (1) through sealant (15).
7. The airtightness detection apparatus for a body-in-white according to claim 1, wherein: the middle part of the upper part of the bottom plate (21) is provided with an infrared thermal imager (5), and the infrared thermal imager (5) is connected with the analysis control system (2) through a transmission data line.
8. The airtightness detection apparatus for a body-in-white according to claim 1, wherein: the inner side of the test bed frame (20) is provided with a sliding guide rail (23), and the sliding guide rail (23) is provided with an infrared thermal imager (5).
9. The method for detecting an airtightness detection apparatus for a body-in-white according to any one of claims 1 to 8, wherein: the detection method specifically comprises the following steps:
firstly, manufacturing black organic glass plates (9) with the shapes consistent with the shapes of front and rear doors, front windshield glass and tail door glass windows on two sides of a body-in-white (1) to be detected according to the body-in-white (1) to be detected;
secondly, placing an infrared heater (4) and an infrared sensor (6) in a body-in-white (1) and connecting a transmission data line of the infrared heater and the infrared sensor to an external analysis control system (2) through a sealed connecting hole of a black organic glass plate (9) at a vehicle door;
thirdly, the black organic glass plate (9) is respectively connected with the front and rear doors, the front windshield glass and the tail door glass window on the two sides of the body-in-white (1) in a sealing way by using a sealant (15), and the other installation holes, coating process holes, positioning holes, drain holes, process via holes and lightening holes which are communicated with the inside and the outside of the body-in-white (1) are sealed, so that a sealed cavity is formed inside the body-in-white (1);
fourthly, respectively installing a plurality of infrared thermal imaging cameras (5) on a test bench frame (20) of a test bench (13), wherein the plurality of infrared thermal imaging cameras (5) are distributed at fixed positions around the white body (1) and are connected with an analysis control system (2);
fifthly, the analysis control system (2) controls the infrared heater (4) and the infrared sensor (6), and when the temperature and the infrared radiation intensity in the body-in-white cavity reach preset values, the infrared heater (4) is turned off, and the time, the temperature and the radiation intensity are recorded;
sixthly, rotating a test bed (13) for placing the body-in-white (1) according to a preset direction, controlling the infrared thermal imager (5) to shoot once by the analysis control system (2) every time the test bed (13) rotates by a preset angle, controlling the test bed (13) to lift, repeatedly rotating and shooting to obtain infrared images with different heights and directions, and sending the shot infrared images to the analysis control system (2) for identification and analysis;
seventhly, when the air tightness of the body-in-white (1) does not meet the standard, extracting a temperature singular point or area by the analysis control system (2) and determining the leakage position of the body-in-white (1);
eighthly, controlling the test bed (13) to rotate, enabling the leakage position of the body-in-white (1) to be clearly reflected in the shooting range of the infrared thermal imager (5), starting video recording and fast shooting, and accurately positioning the leakage position of the body-in-white (1);
ninthly, according to preset time, the analysis control system (2) carries out analysis and calculation according to the infrared image, the infrared radiation intensity value and the temperature value which are transmitted in real time, the difference value between the infrared radiation intensity value inside the body-in-white (1) and the radiation intensity value after the infrared heater (4) is turned off is focused, and the leakage rate of the body-in-white (1) is obtained;
and tenth, if the air tightness of the body-in-white (1) does not meet the standard, detecting the leakage reason of the body-in-white (1), resealing the leakage position of the body-in-white (1) after the leakage reason is found out, and returning to the fifth step to start detection again until the air tightness of the body-in-white (1) meets the standard.
10. The airtightness detection method for a body-in-white according to claim 9, wherein: when the leakage position of the body-in-white (1) is detected in the tenth step, if the outer surface of the body-in-white cavity which is not easy to detect exists in the infrared thermal imager (5) arranged on the test bed frame (20), the handheld infrared thermal imager is adopted for accurate detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211637744.5A CN115773844A (en) | 2022-12-20 | 2022-12-20 | Air tightness detection device and detection method for body-in-white |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211637744.5A CN115773844A (en) | 2022-12-20 | 2022-12-20 | Air tightness detection device and detection method for body-in-white |
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| CN115773844A true CN115773844A (en) | 2023-03-10 |
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| CN202211637744.5A Pending CN115773844A (en) | 2022-12-20 | 2022-12-20 | Air tightness detection device and detection method for body-in-white |
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| CN (1) | CN115773844A (en) |
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- 2022-12-20 CN CN202211637744.5A patent/CN115773844A/en active Pending
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