Automobile expansion tank air tightness detection device and method

Abstract

The present invention discloses an automobile expansion tank air tightness detection device and method thereof. The present invention relates to the technical field of expansion tanks, comprising a bracket, a water pool fixedly connected to the bracket, a positioning plate movably mounted on the water pool, and a test water tank movably connected to the positioning plate. The present invention heats the coolant in the water pool and vibrates the test water tank, thereby simulating the state of the automobile during operation, making the detection results of the test water tank more comprehensive and accurate. The test water tank is located in a transparent coolant, which is convenient for staff to observe the location where bubbles are generated, thereby determining whether the leakage is caused by poor interface sealing or cracks or leaks in the test water tank, and facilitating targeted treatment of the test water tank. The test water tank and the positioning plate are easy to install. After the air tightness test is completed, the test water tank is easy to automatically pop out of the liquid surface and pop out from the positioning rod through a pop-up component, making it easy to unload.

Description

Technical Field

[0001] The present invention relates to the technical field of expansion water tanks, and in particular to an air tightness detection device and method for an automobile expansion water tank. Background Art

[0002] As a key component of the automobile engine cooling system, the automobile expansion tank's main function is to store and release superheated steam to maintain stable pressure in the cooling system and avoid engine overheating or damage due to excessive pressure. Therefore, the air tightness of the expansion tank is crucial.

[0003] Chinese patent application number CN114646437B discloses an air tightness testing device for an automotive expansion tank. The device includes a frame, an air pump, a cannula and a sealing cover. Multiple legs are fixedly installed at the bottom of the frame, and a workbench is fixedly installed on the top. The size of the workbench is slightly larger than the frame. A placement plate for placing the water tank is fixedly connected to the upper surface of the workbench near the center, and an air pump is fixedly connected to the upper surface at one side edge of the placement plate.

[0004] The above technical solution uses an air pump, connecting air pipe, air valve, cannula, and sealing cap to seal and inflate the water tank. A pressure sensor then monitors the air pressure inside the inflated water tank, determining the airtightness of the water tank based on the pressure value. This pressure is then displayed to the monitoring personnel for observation and judgment. This method is simple and convenient to use, preventing long hours of work by the inspectors from affecting the quality of product testing. However, in actual use, this solution has some shortcomings: First, the method for inspecting the expansion tank is too simple and cannot simulate the environmental conditions of the vehicle during operation. During the manufacturing process of the expansion water tank, if the thickness of some areas is relatively thin, it is easy to be damaged and leak when squeezed by the expanding coolant in the high temperature and vibration environment inside the car. However, this solution only places the workpiece on a placement plate in a room temperature environment. There is a difference between the simulated environment and the actual use environment of the car, which makes the detection effect of the water tank not comprehensive enough; secondly, after the scheme tests the water tank by inflation, since there are multiple interfaces on the water tank, if the sealing effect of the interface position is not good, it will also cause leakage, resulting in erroneous detection results; thirdly, when the water tank body leaks due to cracks, since the gas is colorless, it is difficult for subsequent staff to determine the leak location, which brings troubles to the maintenance work of some water tanks.

[0005] In order to solve the above-mentioned problems, an automobile expansion tank air tightness detection device is now proposed. Summary of the Invention

[0006] The main purpose of the present invention is to provide an automobile expansion tank air tightness detection device and method, which can effectively simulate the environment when the automobile is running, avoid the detection environment being too single, and the water tank detection results being incomplete, and effectively determine the location of the air leak, avoiding detection errors caused by insufficient air tightness at the interface position, and other problems.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] An automobile expansion tank air tightness testing device comprises a bracket, a water pool is fixedly connected to the bracket, a positioning plate is movably mounted on the water pool, the positioning plate is movably connected to the test water tank, a lifting assembly is movably mounted in the water pool, the lifting assembly includes a lifting rod, and the positioning plate is slidably connected to the lifting rod;

[0009] A heating component is fixedly connected in the water pool;

[0010] A cylinder is fixedly connected to one side of the bracket, and a vibration component is movably installed on one side of the pool;

[0011] The test water tank is inflated by an air injection assembly, which includes a tank cover connector and an air guide tube. The output shaft of the cylinder is fixedly connected to the tank cover connector, and the air guide tube is fixedly connected to the tank cover connector. The air guide tube is inserted into the test water tank.

[0012] A pop-up assembly is movably mounted on the bracket, and the pop-up assembly includes a V-shaped plate, one side of the V-shaped plate is located below the positioning plate, and the other side of the V-shaped plate is located on the side of the box cover connector.

[0013] By adopting the above technical solution, the test water tank is immersed in high-temperature coolant, vibrated and inflated to perform air tightness testing, so that the test results are more comprehensive;

[0014] The test water tank is immersed in the liquid to facilitate observation of the bubble generation position and thus determine the bubble generation situation;

[0015] After the air tightness of the test water tank is completed, the test water tank can be easily popped up and pushed out by the pop-up component, making it more convenient to unload the test water tank.

[0016] Preferably, a positioning rod is fixedly connected to the positioning plate, and a mounting hole is provided on the test water tank, and the test water tank is movably mounted on the positioning rod through the mounting hole.

[0017] By adopting the above technical solution, the test water tank is easy to position and install, and the position of the injection port corresponds to the position of the air guide pipe.

[0018] Preferably, a sliding tube is fixedly connected to the positioning plate, the lifting rod is fixedly connected in the water pool, the positioning plate is slidingly connected to the lifting rod through the sliding tube, and the lifting assembly also includes a spring, which is movably connected to the lifting rod and is located below the positioning plate.

[0019] By adopting the above technical solution, the spring can push the test water tank upwards to move it out of the liquid surface.

[0020] Preferably, the heating assembly includes an electric heating plate, a second mounting plate and a temperature sensor. The electric heating plate is fixedly connected to the center position of the bottom of the pool. The second mounting plate is fixedly connected to the inner wall of one side of the pool. The temperature sensor is fixedly connected to the second mounting plate.

[0021] By adopting the above technical solution, the liquid in the pool is heated.

[0022] Preferably, the vibration assembly includes a mounting plate 1, a stepper motor, a bearing and a drive rod, the mounting plate 1 is fixedly connected to the water pool, the stepper motor is fixedly connected to the mounting plate 1, the bearing is rotatably connected to the mounting plate 1, and the bearing passes through the mounting plate 1 upward, the drive rod is rotatably connected in the bearing, and the upper end of the drive rod is fixedly connected to the output shaft of the stepper motor.

[0023] Preferably, the vibration assembly further includes an elastic rod and a vibration ball, the elastic rod is fixedly connected to the lower end of the driving rod, the vibration ball is fixedly connected to the outer end of the elastic rod, and the vibration ball is located between the lifting rods.

[0024] By adopting the above technical solution, the vibrating ball vibrates the positioning plate.

[0025] Preferably, the pop-up assembly also includes a support seat, a slide and a fulcrum, the support seat is fixedly connected to the bracket, the V-shaped plate is rotatably connected to the support seat, the slide is opened on the positioning plate, the plate body on one side of the V-shaped plate can be movably installed in the slide, the fulcrum is fixedly connected to one side position of the box cover connecting piece, and the plate body on the other side of the V-shaped plate is located at the side position of the fulcrum.

[0026] By adopting the above technical solution, the fulcrum is slidably connected to the V-shaped plate, and the fulcrum pushes the V-shaped plate, so that the V-shaped plate can be easily rotated upward.

[0027] Preferably, the gas injection assembly includes a sealing cover, a sealing ring, a connecting plate, an air pressure sensor, a hose and an air pump. The sealing cover is fixedly connected to the box cover connector, the sealing ring is fixedly connected in the sealing cover, the air duct is fixedly connected to the sealing cover, the lower end of the air duct passes through the sealing ring and is fixedly connected to the connecting plate, the air pressure sensor is fixedly connected to the connecting plate, the air pump is fixedly connected to the bracket, the air pump is fixedly connected to the upper end of the air duct through the hose, an injection port is opened on the test water tank, and the air pressure sensor can be inserted into the injection port along with the lower end of the air duct.

[0028] By adopting the above technical solution, the air pump can inflate the test water tank and perform air pressure detection.

[0029] Preferably, a PLC controller is fixedly connected to the bracket, and the PLC controller is located below the cylinder. A transparent lampshade is fixedly connected to the bottom of the pool, and a lighting lamp is fixedly connected inside the transparent lampshade.

[0030] A method for using an automobile expansion tank air tightness detection device comprises the following steps:

[0031] Step 1: Introduce a transparent coolant or other test liquid into the water pool, power on the electric heating plate to heat the liquid in the water pool, and monitor the temperature of the heated liquid with a temperature sensor to heat the liquid to a temperature within the normal use range of the car, simulating the temperature environment when the car expansion tank is in use;

[0032] Step 2: The output shaft of the cylinder moves the box cover connector downward, and the fulcrum on the side of the box cover connector moves synchronously. Under the action of gravity, the plate body on one side of the V-shaped plate slides downward from the sliding slot, so that the plate body on one side of the V-shaped plate moves to the position below the positioning plate, and then the cylinder is paused;

[0033] Step 3: Movably install the mounting holes on the test water tank and the positioning rods on the positioning plate so that the test water tank is movably installed on the positioning plate;

[0034] Step 4: The cylinder starts again, pushing the tank cover connector to move again, inserting the lower end of the air guide tube and the air pressure sensor into the injection port, and then the sealing cover is sealed with the injection port through the sealing ring, and starts to push the test water tank and the positioning plate downward along the lifting rod, compressing the spring, and immersing the test water tank in the coolant of the pool;

[0035] Step 5: After the test water tank is located at the appropriate position in the coolant, the lower end of the positioning plate contacts the vibrating ball, and then the air pump is started to inflate the test water tank through the hose and air guide tube. The air pressure sensor detects the air pressure of the test water tank in real time. When the air pressure in the test water tank reaches the set value, the PLC controller controls the air pump to stop inflating;

[0036] Step 6: Start the stepper motor, causing the driving rod to drive the vibrating ball to rotate slowly and slowly hit the positioning plate, thereby simulating the vibration environment when the car is running. The air pressure sensor detects whether the air pressure in the test water tank changes. When there is a leak, the location of the bubbles in the liquid can be observed to mark the leaking part of the test water tank for subsequent processing.

[0037] Step 7: After the test is completed, slowly reset the cylinder, move the positioning plate upward out of the liquid surface, and after the air guide tube is moved out of the test water tank, the box cover connector continues to move, and the fulcrum rotates the V-shaped plate upward, so that the plate body on one side of the V-shaped plate pushes the test water tank upward, making it easier to unload the test water tank.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. In the present invention, the coolant in the water pool is heated, and the test water tank is vibrated to simulate the environment when the car is running, and the test water tank is inflated. The air tightness is tested by detecting the air pressure change, making the test results more comprehensive and accurate.

[0040] 2. In the present invention, when the test water tank leaks, the gas is discharged outward from the leaking position, thereby generating bubbles in the transparent coolant. The staff observes the location where the bubbles are generated to determine whether the leakage is caused by poor sealing of the interface or cracks or leaks in the test water tank, thereby facilitating targeted treatment.

[0041] 3. In the present invention, the test water tank and the positioning plate are easy to install. After the air tightness test is completed, the test water tank can automatically pop out of the liquid level and pop out from the positioning rod through the pop-up component, making it easy to unload. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a structural diagram of the present invention as a whole;

[0043] Figure 2 It is a schematic diagram of the overall structure of another aspect of the present invention;

[0044] Figure 3 This is a schematic diagram of the connection between the V-shaped plate and the positioning plate of the present invention;

[0045] Figure 4 This is a schematic structural diagram of the positioning plate of the present invention;

[0046] Figure 5 Schematic diagram of the connection structure between the lifting rod and the spring of the present invention;

[0047] Figure 6 Schematic diagram of the structure of the vibration component of the present invention

[0048] Figure 7Schematic cross-sectional view of the box cover connector of the present invention;

[0049] Figure 8 This is a schematic diagram of the connection structure between the V-shaped plate and the support seat of the present invention;

[0050] Figure 9 For the present invention Figure 2 Schematic diagram of the locally enlarged structure at point A in the middle.

[0051] Figure: 1, water tank; 2, positioning plate; 201, positioning rod; 202, slide tube; 3, test water tank; 301, injection port; 302, mounting hole; 4, cylinder; 5, lifting assembly; 501, lifting rod; 502, spring; 6, vibration assembly; 601, mounting plate 1; 602, stepping motor; 603, bearing; 604, driving rod; 605, elastic rod; 606, vibration ball; 7, ejection assembly; 701, V-shaped plate; 702, support base ;703, sliding mouth;704, fulcrum;8, bracket;9, gas injection assembly;901, box cover connector;902, sealing cover;903, sealing ring;904, air guide tube;905, connecting plate;906, air pressure sensor;907, hose;908, air pump;10, heating assembly;1001, electric heating plate;1002, mounting plate 2;1003, temperature sensor;11, PLC controller;12, transparent lampshade;13, lighting lamp. DETAILED DESCRIPTION

[0052] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0053] like Figure 1-9 As shown, an automobile expansion tank air tightness testing device includes a bracket 8, a water tank 1 is fixedly connected to the bracket 8, a positioning plate 2 is movably installed on the water tank 1, and the positioning plate 2 is movably connected to the test water tank 3. The test water tank 3 falls on the positioning plate 2. Under the action of gravity, the bottom surface of the test water tank 3 and the positioning plate 2 contact each other. A lifting assembly 5 is movably installed in the water tank 1. The lifting assembly 5 includes a lifting rod 501. The positioning plate 2 is slidably connected to the lifting rod 501. The lifting rod 501 is bent. The bent position of the lifting rod 501 can prevent the positioning plate 2 from moving further upward.

[0054] A heating component 10 is fixedly connected to the water pool 1. The coolant in the water pool 1 is heated by the heating component 10 and can also perform temperature detection.

[0055] A cylinder 4 is fixedly connected to one side of the bracket 8, and the cylinder 4 pushes the positioning plate 2 and the test water tank 3 to slide downward to facilitate immersion in the coolant. A vibration component 6 is movably installed on one side of the pool 1, and the vibration component 6 vibrates the positioning plate 2 and the test water tank 3;

[0056] The test water tank 3 is inflated by the gas injection assembly 9, which includes a tank cover connector 901 and an air guide tube 904. The output shaft of the cylinder 4 is fixedly connected to the tank cover connector 901, and the air guide tube 904 is fixedly connected to the tank cover connector 901, so that the tank cover connector 901 facilitates the downward movement of the air guide tube 904. The air guide tube 904 is inserted into the test water tank 3 and is inserted into the test water tank 3 through the injection port 301.

[0057] A pop-up assembly 7 is movably mounted on the bracket 8, and the pop-up assembly 7 includes a V-shaped plate 701. One side of the V-shaped plate 701 is located below the positioning plate 2, and the other side of the V-shaped plate 701 is located on the side of the box cover connector 901. The weight of the plates on both sides of the V-shaped plate 701 is different. The plate of the V-shaped plate 701 that contacts the pool 1 weighs more than the plate on the other side, so that the V-shaped plate 701 can be easily placed on the pool 1 on one side under the action of gravity.

[0058] A positioning rod 201 is fixedly connected to the positioning plate 2, and a mounting hole 302 is provided on the test water tank 3. The test water tank 3 is movably mounted on the positioning rod 201 through the mounting hole 302, and the test water tank 3 moves downward through the mounting hole 302 to be plugged into the positioning rod 201.

[0059] A sliding tube 202 is fixedly connected to the positioning plate 2. The sliding tube 202 is extended to facilitate the sliding tube 202 to drive the positioning plate 2 to slide on the lifting rod 501. The lifting rod 501 is fixedly connected to the water pool 1. The positioning plate 2 is slidably connected to the lifting rod 501 through the sliding tube 202. The lifting assembly 5 also includes a spring 502. The spring 502 is movably connected to the lifting rod 501 and is located below the positioning plate 2. The spring 502 is compressed when the positioning plate 2 moves downward. After the positioning plate 2 loses its pressure, the spring 502 resumes its expansion and pushes the positioning plate 2 upward, thereby moving the test water tank 3 thereon out of the liquid surface.

[0060] The heating assembly 10 includes an electric heating plate 1001, a second mounting plate 1002 and a temperature sensor 1003. The electric heating plate 1001 is fixedly connected to the center of the bottom of the pool 1. The electric heating plate 1001 heats the coolant. The second mounting plate 1002 is fixedly connected to the inner wall of one side of the pool 1. The temperature sensor 1003 is fixedly connected to the second mounting plate 1002. The temperature sensor 1003 facilitates temperature detection of the coolant. The temperature sensor 1003 is electrically connected to the PLC controller 11.

[0061] The vibration assembly 6 includes a mounting plate 601, a stepper motor 602, a bearing 603 and a drive rod 604. The mounting plate 601 is fixedly connected to the water pool 1, the stepper motor 602 is fixedly connected to the mounting plate 601, the stepper motor 602 is electrically connected to the PLC controller 11, the bearing 603 is rotatably connected to the mounting plate 601, and the bearing 603 upwardly penetrates the mounting plate 601, the drive rod 604 is rotatably connected in the bearing 603, and the upper end of the drive rod 604 is fixedly connected to the output shaft of the stepper motor 602, so that the stepper motor 602 rotates the drive rod 604, so that the drive rod 604 can rotate in the liquid.

[0062] The vibration assembly 6 also includes an elastic rod 605 and a vibration ball 606. The elastic rod 605 is fixedly connected to the lower end of the driving rod 604. The elastic rod 605 is an elastic steel elastic rod that can bend after being squeezed. The vibration ball 606 is fixedly connected to the outer end of the elastic rod 605. The vibration ball 606 is located between the lifting rods 501. The vibration ball 606 knocks on the positioning plate 2 moved to the side position, causing a small vibration.

[0063] The pop-up assembly 7 also includes a support seat 702, a slide 703 and a fulcrum 704. The support seat 702 is fixedly connected to the bracket 8, and the V-shaped plate 701 is rotatably connected to the support seat 702. The V-shaped plate 701 rotates back and forth on the support seat 702. The slide 703 is opened on the positioning plate 2. The plate body on one side of the V-shaped plate 701 can be movably installed in the slide 703. The plate body on one side of the V-shaped plate 701 is located at the lower position of the positioning plate 2. It can be inserted into the slide 703 by rotating upward and gradually extend upward from the slide 703. The fulcrum 704 is fixedly connected to one side of the box cover connecting piece 901, and the plate body on the other side of the V-shaped plate 701 is located at the side position of the fulcrum 704, so that when the fulcrum 704 rotates upward with the box cover connecting piece 901, the fulcrum 704 can easily push the plate body on the other side of the V-shaped plate 701 to rotate.

[0064] The gas injection assembly 9 includes a sealing cover 902, a sealing ring 903, a connecting plate 905, an air pressure sensor 906, a hose 907 and an air pump 908. The sealing cover 902 is fixedly connected to the box cover connector 901, and the sealing ring 903 is fixedly connected inside the sealing cover 902. The sealing cover 902 is sealed with the injection port 301 through the sealing ring 903. The injection port 301 is inserted into the sealing ring 903. The air guide tube 904 is fixedly connected to the sealing cover 902. The air guide tube 904 passes through the sealing cover 902, with one end inserted into the lower position of the sealing cover 902 and the other end located above the sealing cover 902. The lower end of the air guide tube 904 passes through the sealing ring 903 and is fixedly connected to the connecting plate 905. The air pressure sensor 906 is fixedly connected to the connecting plate 905. The air pressure sensor 906 moves synchronously with the lower end of the air guide tube 904. The air pump 908 is fixedly connected to the bracket 8. The PLC controller 11 controls the air pump 908 to start or stop. The air pump 908 is fixedly connected to the upper end of the air guide tube 904 through the hose 907. An injection port 301 is provided on the test water tank 3. The air pressure sensor 906 can be inserted into the injection port 301 along with the lower end of the air guide tube 904 to monitor the air pressure therein in real time.

[0065] A PLC controller 11 is fixedly connected to the bracket 8, and the PLC controller 11 is located below the cylinder 4. A transparent lampshade 12 is fixedly connected to the bottom of the pool 1, and a lighting lamp 13 is fixedly connected inside the transparent lampshade 12 to illuminate the transparent coolant in the pool 1, making the bubbles easier to observe.

[0066] It should be noted that the use steps of the present invention are as follows: a transparent coolant or other testing liquid is introduced into the water pool 1, the coolant used when the car is running is used, and the electric heating plate 1001 is energized to heat the liquid in the water pool 1 and control the temperature within the temperature range of the car coolant when it is running. For example, during normal operation, the normal operating temperature of the coolant of most car engines is in the range of 80 degrees Celsius to 105 degrees Celsius. The liquid in the water pool 1 can be controlled within the range of 80 to 90 degrees Celsius to avoid a large number of bubbles in the water pool 1 that obstruct the observation line of sight. The temperature sensor 1003 detects the temperature of the heated liquid, thereby heating the liquid to a temperature range during normal use of the car. The temperature sensor 1003 transmits the temperature signal to the PLC controller 11 in real time to simulate the temperature environment when the car expansion tank is in use.

[0067] The output shaft of the cylinder 4 moves the box cover connecting piece 901 downward, and the fulcrum 704 on the side of the box cover connecting piece 901 moves synchronously. The fulcrum 704 moves forward, so that the V-shaped plate 701 is no longer pressed upward. Under the action of gravity, the plate body on one side of the V-shaped plate 701 slides downward from the sliding slot 703, so that the plate body on one side of the V-shaped plate 701 moves to the position below the positioning plate 2, and then the cylinder 4 is paused to maintain the position of the V-shaped plate 701 and the box cover connecting piece 901;

[0068] The mounting holes 302 on the test water tank 3 are movably mounted on the positioning rods 201 on the positioning plate 2, so that the test water tank 3 is movably mounted on the positioning plate 2. The test water tank 3 can be positioned by plugging and installing the mounting holes 302 with a plurality of positioning rods 201. The injection port 301 on the test water tank 3 is conveniently positioned to correspond to the sealing cover 902 and the air guide tube 904.

[0069] The cylinder 4 is started again, pushing the tank cover connector 901 to move again, and the lower end of the air guide tube 904 and the air pressure sensor 906 are inserted into the injection port 301. Then the sealing cover 902 is sealed and connected to the injection port 301 through the sealing ring 903, so that the sealing cover 902 is sealed and connected to the injection port 301 on the corresponding test water tank 3. Interfaces are provided at other positions on the test water tank 3. These interfaces are sealed by external devices such as sealing plugs and other structures. After the sealing cover 902 is plugged into the injection port 301, the test water tank 3 and the positioning plate 2 continue to be pushed downward along the lifting rod 501. The positioning plate 2 compresses the spring 502 and immerses the test water tank 3 in the coolant of the pool 1, thereby immersing the test water tank 3 in the high-temperature coolant, so that the test water tank 3 is heated;

[0070] After the test water tank 3 is located at a suitable position in the coolant, the cylinder 4 no longer pushes the tank cover connector 901 to continue moving downward, and the compressed spring 502 squeezes the test water tank 3 in the opposite direction, so that the injection port 301 on the test water tank 3 is positioned with the sealing cover 902, and the lower end of the positioning plate 2 contacts the vibration ball 606. Then the PLC controller 11 starts the air pump 908, and inflates the test water tank 3 through the hose 907 and the air guide tube 904. The air pressure sensor 906 detects the air pressure of the test water tank 3 in real time and transmits the detection air pressure signal to the PLC controller 11. When the air pressure in the test water tank 3 reaches the set value, the PLC controller 11 starts the air pump 908. 11 controls the air pump 908 to stop inflating, and then observes the air pressure signal transmitted by the PLC controller 11 within a certain period of time, for example, within five minutes, to see if the air pressure in the test water tank 3 changes. If there is no change, it means that the test water tank 3 is in a sealed state at the current stage. If the air pressure in the test water tank 3 continues to decrease, it means that the test water tank 3 is leaking. By observing the position where bubbles are generated on the test water tank 3 in the liquid, it is marked. If the bubbles are at the injection port 301 and the interface position, it means that there may be a poor sealing problem. If the bubbles are at the injection port 301 and other positions of the interface, it means that there is a leak in the test water tank 3.

[0071] When the air pressure in the test water tank 3 no longer changes, it is preliminarily confirmed that there is no gas leakage in the test water tank 3, and then the stepper motor 602 is started, and the output shaft of the stepper motor 602 is fixedly connected to the driving rod 604 and drives it to rotate, and the elastic rod 605 at the lower end of the driving rod 604 rotates and drives the vibration ball 606 to rotate, and the vibration ball 606 slowly knocks the positioning plate 2, causing the positioning plate 2 to vibrate slightly, thereby simulating the vibration environment when the car is running. The vibration of the positioning plate 2 provides a vibration environment for the test water tank 3, and the air pressure sensor 906 detects whether the air pressure in the test water tank 3 changes. Continue to observe for a period of time to see whether the air pressure in the test water tank 3 changes. For example, whether the air pressure in the test water tank 3 changes within five minutes. When there is a leak, the air pressure in the test water tank 3 decreases. The leaking part of the test water tank 3 can be marked by observing the position where the bubbles are generated in the liquid. For example, as mentioned above, when the bubbles are located at the injection port 301 or the interface position, the sealing ring 903, the sealing plug and other structures at the injection port 301 and the interface position in the test water tank 3 can be replaced, and the test can be performed again to determine whether the seal is poor or there are cracks or holes at the interface position. When the bubbles are at the box position on the test water tank 3, it means that the test water tank 3 is prone to leakage in the automobile operating environment. Marking the position of the bubbles makes it easy to find problems at the corresponding position when the test water tank 3 is produced, or to quickly find the position when the test water tank 3 is repaired;

[0072] After the test is completed, the cylinder 4 is slowly reset, so that the box cover connecting piece 901 moves upward, the compressed spring 502 begins to recover, and pushes the positioning plate 2 upward, so that the positioning plate 2 slides upward on the lifting rod 501 through the sliding tube 202. When the sliding tube 202 moves to the bending position of the lifting rod 501, the sliding tube 202 and the positioning plate 2 no longer move upward, and the positioning plate 2 and the test water tank 3 thereon move upward out of the liquid surface. At this time, the positioning plate 2 is located above the plate body on one side of the V-shaped plate 701. Position, the box cover connector 901 continues to move, so that the sealing cover 902 and the injection port 301 are separated from each other, the air guide tube 904 and the air pressure sensor 906 gradually move out of the test water tank 3, and the box cover connector 901 continues to move, and the fulcrum 704 rotates the plate body on the other side of the V-shaped plate 701 upward, so that the plate body on the side of the V-shaped plate 701 located below the sliding port 703 rotates upward and extends into the sliding port 703, and gradually rises, pushing the upper test water tank 3 upward to facilitate unloading of the test water tank 3.

[0073] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An automobile expansion tank air tightness detection device, comprising a bracket (8), characterized in that: The bracket (8) is fixedly connected to a water pool (1), a positioning plate (2) is movably mounted on the water pool (1), the positioning plate (2) is movably connected to a test water tank (3), a lifting assembly (5) is movably mounted in the water pool (1), the lifting assembly (5) includes a lifting rod (501), and the positioning plate (2) is slidably connected to the lifting rod (501); A heating component (10) is fixedly connected to the water pool (1); A cylinder (4) is fixedly connected to one side of the bracket (8), and a vibration component (6) is movably installed on one side of the pool (1); The test water tank (3) is inflated by an air injection assembly (9), the air injection assembly (9) comprising a tank cover connector (901) and an air guide tube (904), the output shaft of the cylinder (4) being fixedly connected to the tank cover connector (901), the air guide tube (904) being fixedly connected to the tank cover connector (901), and the air guide tube (904) being inserted into the test water tank (3); A pop-up assembly (7) is movably mounted on the bracket (8), and the pop-up assembly (7) includes a V-shaped plate (701). One side of the V-shaped plate (701) is located below the positioning plate (2), and the other side of the V-shaped plate (701) is located on the side of the box cover connector (901).

2. The vehicle expansion tank air tightness detection device according to claim 1, characterized in that: A positioning rod (201) is fixedly connected to the positioning plate (2), a mounting hole (302) is provided on the test water tank (3), and the test water tank (3) is movably mounted on the positioning rod (201) through the mounting hole (302).

3. The vehicle expansion tank air tightness detection device according to claim 1, characterized in that: The positioning plate (2) is fixedly connected to a sliding tube (202), the lifting rod (501) is fixedly connected in the pool (1), the positioning plate (2) is slidably connected to the lifting rod (501) via the sliding tube (202), and the lifting assembly (5) further includes a spring (502), the spring (502) is movably connected to the lifting rod (501), and is located below the positioning plate (2).

4. The automobile expansion tank air tightness detection device according to claim 1, characterized in that: The heating assembly (10) comprises an electric heating plate (1001), a second mounting plate (1002) and a temperature sensor (1003); the electric heating plate (1001) is fixedly connected to the center of the bottom of the pool (1); the second mounting plate (1002) is fixedly connected to the inner wall of one side of the pool (1); and the temperature sensor (1003) is fixedly connected to the second mounting plate (1002).

5. The automobile expansion tank air tightness detection device according to claim 1, characterized in that: The vibration assembly (6) includes a mounting plate (601), a stepper motor (602), a bearing (603) and a driving rod (604), wherein the mounting plate (601) is fixedly connected to the pool (1), the stepper motor (602) is fixedly connected to the mounting plate (601), the bearing (603) is rotatably connected to the mounting plate (601), and the bearing (603) passes through the mounting plate (601) upward, the driving rod (604) is rotatably connected in the bearing (603), and the upper end of the driving rod (604) is fixedly connected to the output shaft of the stepper motor (602).

6. The automobile expansion tank air tightness detection device according to claim 5, characterized in that: The vibration assembly (6) further comprises an elastic rod (605) and a vibration ball (606), wherein the elastic rod (605) is fixedly connected to the lower end of the driving rod (604), and the vibration ball (606) is fixedly connected to the outer end of the elastic rod (605), and the vibration ball (606) is located between the lifting rods (501).

7. The automobile expansion tank air tightness detection device according to claim 6, characterized in that: The pop-up assembly (7) further comprises a support seat (702), a sliding opening (703) and a fulcrum (704), wherein the support seat (702) is fixedly connected to the bracket (8), the V-shaped plate (701) is rotatably connected to the support seat (702), the sliding opening (703) is provided on the positioning plate (2), the plate body on one side of the V-shaped plate (701) is movably mounted in the sliding opening (703), the fulcrum (704) is fixedly connected to one side of the box cover connector (901), and the plate body on the other side of the V-shaped plate (701) is located at a side position of the fulcrum (704).

8. The automobile expansion tank air tightness detection device according to claim 1, characterized in that: The gas injection assembly (9) includes a sealing cover (902), a sealing ring (903), a connecting plate (905), an air pressure sensor (906), a hose (907) and an air pump (908), wherein the sealing cover (902) is fixedly connected to the box cover connector (901), the sealing ring (903) is fixedly connected inside the sealing cover (902), the air guide tube (904) is fixedly connected to the sealing cover (902), and the lower end of the air guide tube (904) passes through the sealing ring. (903) is fixedly connected to the connecting plate (905), the air pressure sensor (906) is fixedly connected to the connecting plate (905), the air pump (908) is fixedly connected to the bracket (8), the air pump (908) is fixedly connected to the upper end of the air guide tube (904) through the hose (907), and the test water tank (3) is provided with an injection port (301), and the air pressure sensor (906) can be inserted into the injection port (301) along with the lower end of the air guide tube (904).

9. The automobile expansion tank air tightness detection device according to claim 1, characterized in that: A PLC controller (11) is fixedly connected to the bracket (8), and the PLC controller (11) is located below the cylinder (4). A transparent lampshade (12) is fixedly connected to the bottom of the pool (1), and a lighting lamp (13) is fixedly connected inside the transparent lampshade (12).

10. A method for using a vehicle expansion tank air tightness detection device, referring to the vehicle expansion tank air tightness detection device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: A transparent coolant or other test liquid is introduced into the water pool (1), and the electric heating plate (1001) is powered on to heat the liquid in the water pool (1). The temperature sensor (1003) monitors the temperature of the heated liquid, thereby heating the liquid to a temperature range during normal use of the automobile, simulating the temperature environment when the automobile expansion tank is in use; Step 2: The output shaft of the cylinder 4 moves the box cover connecting piece (901) downward, and the fulcrum 704 on the side of the box cover connecting piece (901) moves synchronously. Under the action of gravity, the plate body on one side of the V-shaped plate (701) slides downward from the sliding opening (703), so that the plate body on one side of the V-shaped plate (701) moves to the position below the positioning plate (2), and then the cylinder 4 is paused; Step 3: movably install the mounting hole (302) on the test water tank (3) and the positioning rod (201) on the positioning plate (2), so that the test water tank (3) is movably installed on the positioning plate (2); Step 4: The cylinder (4) is started again, pushing the box cover connector (901) to move again, and the lower end of the air guide tube (904) and the air pressure sensor (906) are inserted into the injection port (301). Then, the sealing cover (902) is sealed and connected to the injection port (301) through the sealing ring (903), and starts to push the test water tank (3) and the positioning plate (2) downward along the lifting rod (501), compressing the spring (502), and immersing the test water tank (3) in the coolant of the pool (1); Step 5: After the test water tank (3) is located at a suitable position in the coolant, the lower end of the positioning plate (2) contacts the vibrating ball (606), and then the air pump (908) is started to inflate the test water tank (3) through the hose (907) and the air guide tube (904). The air pressure sensor (906) detects the air pressure of the test water tank (3) in real time. When the air pressure in the test water tank (3) reaches the set value, the PLC controller (11) controls the air pump (908) to stop inflating. Step 6: The stepper motor (602) is started, so that the driving rod (604) drives the vibration ball (606) to rotate slowly and slowly knock the positioning plate (2), thereby simulating the vibration environment when the car is running. The air pressure sensor (906) detects whether the air pressure in the test water tank (3) changes. When there is a leak, the leaking part of the test water tank (3) can be marked by observing the position of the bubble in the liquid to facilitate subsequent processing; Step 7: After the test is completed, the cylinder (4) is slowly reset, the positioning plate (2) is moved upward out of the liquid surface, and after the air guide tube (904) is moved out of the test water tank (3), the box cover connector (901) continues to move, and the fulcrum (704) rotates the V-shaped plate (701) upward, so that the plate body on one side of the V-shaped plate (701) pushes the test water tank (3) upward, making it easier to unload the test water tank (3).

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