Device and method for detecting air tightness of automobile fuel tank

Abstract

The invention relates to the technical field of automobile fuel tank airtightness detection, in particular to an automobile fuel tank airtightness detection device. Comprising a rack and a detection assembly, the detection assembly comprises a U-shaped frame, an air distribution seat, an air inlet electric valve, an air exhaust electric valve, an air conveying pipe, a pressure sensor, an oil tank body, a mold component and a clamping component, the air exhaust electric valve is closed, and the air inlet electric valve is closed after being opened at regular time. The pressure sensor detects the pressure and feeds back data information to the control PLC, if the oil tank body has a gas leakage point position, the pressure detected by the pressure sensor is lower than a normal value, and the airtightness of the oil tank body is unqualified, so that a worker does not need to subjectively judge the airtightness of the detected oil tank, the detection precision is higher, and the detection efficiency is improved. And the equipment does not need to be provided with a water pool, so that the size is smaller, the accuracy of detection data can be improved, and the equipment size can be optimized.

Description

Technical Field

[0001] This invention relates to the field of automotive fuel tank airtightness testing technology, and more particularly to an automotive fuel tank airtightness testing device and method. Background Technology

[0002] The fuel tank is an important component of a car, and its sealing performance is the most important performance characteristic of the fuel tank. During the whole vehicle production process, the fuel tank must undergo 100% sealing performance testing to ensure that its sealing performance is qualified before it can be assembled into the car.

[0003] Traditional automotive fuel tank sealing tests involve immersing the tank in water while simultaneously introducing high-pressure gas. The tank's sealing is then subjectively assessed by observing whether bubbles escape. This method, relying on subjective judgment, leads to a higher false alarm rate and inaccurate test results. Furthermore, the need for a water tank results in a large footprint for traditional fuel tank sealing testing systems. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for testing the airtightness of automotive fuel tanks, which can improve the accuracy of test data and facilitate the optimization of equipment size.

[0005] To achieve the above objectives, the present invention provides an automotive fuel tank airtightness testing device, including a frame and a testing component;

[0006] The detection assembly includes a U-shaped frame, a gas distribution seat, an intake electric valve, an exhaust electric valve, an air supply pipe, a pressure sensor, an oil tank body, a mold component, and a clamping component. The U-shaped frame is installed on the rear side of the frame, the gas distribution seat is installed on the top of the U-shaped frame, the intake electric valve is installed on the left air inlet of the gas distribution seat, the exhaust electric valve is installed on the right air outlet of the gas distribution seat, the air supply pipe is connected to the connectors on the top outlet of the gas distribution seat and the oil filling port of the oil tank body, the pressure sensor is installed on the front side of the gas distribution seat, and its detection part extends into the internal T-shaped air passage. The oil tank body is limited and fixed by the mold component and the clamping component.

[0007] The mold component includes a bottom mold and mating parts. The bottom mold is fixed on the frame. The mating parts are located in the middle and on both sides of the bottom mold.

[0008] The mating components include a limiting plate and an L-shaped plate. The limiting plate is symmetrically installed on the bottom mold and slidably connected to the oil tank body. The L-shaped plate is detachably connected to the frame and symmetrically arranged, and is also detachably connected to the oil tank body.

[0009] The clamping component includes a positioning platform and an actuating component. The positioning platform is integrally formed with the bottom mold. The actuating component is located on the side of the positioning platform near the oil tank body.

[0010] The actuating components include a corner cylinder and a clamping plate. The corner cylinder is mounted on the top of the positioning platform, and the clamping plate is mounted on the output end of the corner cylinder.

[0011] The control panel and microcomputer are located on the left side of the rack.

[0012] The vehicle fuel tank airtightness testing device further includes a layout assembly, which includes a layout frame and a top plate. The layout frame is detachably connected to the U-shaped frame and is located on top of the U-shaped frame; the top plate is installed on top of the layout frame.

[0013] One method for testing the airtightness of a car fuel tank, using the aforementioned car fuel tank airtightness testing device, is characterized in that the method includes the following steps:

[0014] Adjust the working pressure of the air pipeline according to processing requirements;

[0015] The qualified fuel tank body test piece is fixed by mold components and clamping components to test whether the equipment meets the test standards. After meeting the test standards, the test piece is replaced.

[0016] Connect the outlet side of the gas pipeline to the connector on the top of the fuel tank body to form a gas supply passage;

[0017] The exhaust electric valve is closed, and the intake electric valve opens and closes after a time interval, thus filling the inside of the fuel tank with compressed air.

[0018] After the compressed air is closed by the intake electric valve and the exhaust electric valve, it is stably stored in a closed environment. At this time, the pressure sensor detects the pressure and feeds the data back to the control PLC. Finally, the data is displayed on the microcomputer screen.

[0019] If there is a gas leak point in the fuel tank, the pressure detected by the pressure sensor will be lower than the normal value. In this case, the fuel tank is not airtight.

[0020] After the inspection is completed, the fuel tank body is transferred according to whether it passes or fails.

[0021] This invention discloses an automotive fuel tank airtightness testing device. The working pressure of the air pipeline is adjusted according to processing needs. A qualified fuel tank test piece is fixed using mold components and clamping components to test whether the equipment meets the testing standards. After meeting the standards, the test piece is replaced. The outlet side of the air supply pipe is connected to the top of the fuel tank body to form an air supply passage. The exhaust electric valve is closed, and the intake electric valve opens and closes periodically, thus filling the fuel tank body with compressed air. After the compressed air passes through the intake and exhaust electric valves and is closed, it is stably stored in a sealed environment. At this time, the pressure sensor detects the pressure and feeds the data back to the control PLC. If there is a gas leak in the fuel tank body, the pressure detected by the pressure sensor will be lower than the normal value. In this case, the fuel tank body is considered airtight. This application eliminates the need for workers to subjectively judge the sealing performance of the tested fuel tank, resulting in higher testing accuracy. Furthermore, the equipment does not require a water tank, making it smaller in size and improving the accuracy of the test data. It also facilitates optimization of the equipment size. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0023] Figure 1 This is a schematic diagram of the overall structure of the automotive fuel tank airtightness testing device according to the first embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the limiting plate according to the first embodiment of the present invention.

[0025] Figure 3 This is a schematic diagram of the overall structure of the automotive fuel tank airtightness testing device according to the second embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram showing the setting position of the rolling ball according to the third embodiment of the present invention.

[0027] Figure 5 This is a flowchart of a method for testing the airtightness of an automotive fuel tank.

[0028] In the diagram: 101-Frame, 102-U-shaped frame, 103-Gas distribution seat, 104-Intake electric valve, 105-Exhaust electric valve, 106-Gas supply pipe, 107-Pressure sensor, 108-Oil tank body, 109-Bottom mold, 110-Limit plate, 111-L-shaped plate, 112-Positioning platform, 113-Corner cylinder, 114-Clamping plate, 115-Control panel, 116-Microcomputer, 201-Layout frame, 202-Top plate, 301-Connecting column, 302-Rolling ball. Detailed Implementation

[0029] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0030] Example 1:

[0031] like Figure 1 and Figure 2 As shown, where Figure 1 This is a schematic diagram of the overall structure of a car fuel tank airtightness testing device. Figure 2 This is a schematic diagram of the limiting plate. The present invention provides an automotive fuel tank airtightness testing device, comprising a frame 101 and a testing assembly. The testing assembly includes a U-shaped frame 102, a gas distribution seat 103, an intake electric valve 104, an exhaust electric valve 105, an air supply pipe 106, a pressure sensor 107, a fuel tank body 108, a mold component, and a clamping component. The mold component includes a bottom mold 109 and mating parts. The mating parts include a limiting plate 110 and an L-shaped plate 111. The clamping component includes a positioning platform 112 and an actuating component. The actuating component includes a corner cylinder 113 and a clamping plate 114. The aforementioned solution improves the accuracy of the testing data and facilitates optimization of the equipment size. It is understood that the aforementioned solution can improve the accuracy of the testing data.

[0032] In this embodiment, the frame 101 can be fixed by bolts.

[0033] The U-shaped frame 102 is installed on the rear side of the frame 101, the air distribution seat 103 is installed on the top of the U-shaped frame 102, the air intake electric valve 104 is installed on the left air intake of the air distribution seat 103, the exhaust electric valve 105 is installed on the right air outlet of the air distribution seat 103, the air supply pipe 106 is connected to the connectors on the top outlet of the air distribution seat 103 and the oil filling port of the oil tank body 108, the pressure sensor 107 is installed on the front side of the air distribution seat 103, and its detection part extends into the internal T-shaped air passage. The oil tank body 108 is limited and fixed by the mold component and the clamping component. The U-shaped frame 102 is fixed with bolts, and a PLC control cabinet is installed on the left rear side. The gas distribution seat 103 is fixed with bolts and has interconnected T-shaped air passages inside. The mounting plate of the intake electric valve 104 is fixed with bolts to the outside of the inlet of the gas distribution seat 103 and connected to an external air source pipeline through a movable pipe. The mounting plate of the exhaust electric valve 105 is fixed with bolts to the outside of the outlet of the gas distribution seat 103. A quick-connect air hose connector is installed on the top outlet of the gas distribution seat 103 to facilitate the connection of the air supply pipe 106. A connector is provided on the oil tank body 108, which is detachable and equipped with a quick-connect air hose connector for easy connection of the air supply pipe 106. The pressure sensor 107 is fixed with bolts for pressure detection and is electrically connected to the PLC through a cable. The mold component and the clamping component are used to fix the oil tank body 108.

[0034] Secondly, the bottom mold 109 is fixed to the frame 101; the mating components are disposed in the middle and on both sides of the bottom mold 109. The bottom mold 109 is fixed by positioning pins and bolts arranged from bottom to top. The mating components are used to fit and fix the oil tank body 108.

[0035] Then, the limiting plates 110 are symmetrically installed on the bottom mold 109 and slidably connected to the oil tank body 108; the L-shaped plates 111 are detachably connected to the frame 101, symmetrically arranged, and detachably connected to the oil tank body 108. The limiting plates 110 are U-shaped structures with openings facing upwards and are fixed by countersunk bolts. The L-shaped plates 111 are fixed by positioning pins and bolts, and can be slidably connected to the left and right sides of the oil tank body 108 to achieve limiting.

[0036] Furthermore, the positioning platform 112 is integrally formed with the bottom mold 109; the actuating component is located on the side of the positioning platform 112 near the oil tank body 108. The positioning platform 112 is provided with threaded holes to facilitate the installation and mating of the actuating component.

[0037] Furthermore, the corner cylinder 113 is installed on the top of the positioning platform 112; the clamping plate 114 is installed on the output end of the corner cylinder 113. The corner cylinder 113 is fixed by bolts, and the clamping plate 114 is fixedly installed on its output end.

[0038] Finally, a control panel 115 and a microcomputer 116 are located on the left side of the frame 101. The control panel 115 is used for connecting the corresponding equipment and is connected to the PLC control cabinet via cables. The software system on the microcomputer 116 can convert the detected pressure of the pressure sensor 107 into a pressure curve graph and display it on the screen. Subsequently, workers can directly observe the pressure curve changes to determine whether the test is qualified. If it is unqualified, there will be no air leakage, and the pressure curve will show increased fluctuations. At the same time, the display screen also displays the pressure value. When it is unqualified, the alarm set on the U-shaped frame 102 will activate to provide a warning.

[0039] When using this invention to improve the accuracy of test data and optimize equipment size, the working pressure of the air pipeline is adjusted according to processing needs. A qualified test piece of the oil tank body 108 is fixed using the mold component and the clamping component to test whether the equipment meets the test standards. After meeting the test standards, the test piece is replaced. The outlet side of the air supply pipe 106 is connected to the connector at the top of the oil tank body 108 to form an air supply passage. The exhaust electric valve 105 is closed, and the intake electric valve 104 opens and closes periodically, thus filling the inside of the oil tank body 108 with compressed air. After the compressed air passes through the intake electric valve 104 and the exhaust electric valve 105 and is closed, it is stably stored in a sealed environment. The pressure sensor 107 detects the pressure and feeds the data back to the control PLC. If there is a gas leak point in the oil tank body 108, the pressure detected by the pressure sensor 107 will be lower than the normal value. At this time, the oil tank body 108 is not airtight. During the test, the gas pipeline can be checked by listening or touching the corresponding air pipe and quick connector to ensure the reliability of the test data. After the test, the opening time of the exhaust electric valve 105 can be set by the test process. This application does not require workers to subjectively judge the sealing of the oil tank under test, the test accuracy is higher, and the equipment does not need to be set up with a water tank, so the size is smaller, which can improve the accuracy of the test data and help optimize the size of the equipment.

[0040] Example 2:

[0041] like Figure 3 As shown, where Figure 3This is a schematic diagram of the overall structure of an automotive fuel tank airtightness testing device. Based on the first embodiment, the present invention provides an automotive fuel tank airtightness testing device, which further includes a layout assembly, including a layout frame 201 and a top plate 202.

[0042] The fabric arrangement frame 201 is detachably connected to the U-shaped frame 102 and is located on top of the U-shaped frame 102; the top plate 202 is installed on top of the fabric arrangement frame 201. The fabric arrangement frame 201 is fixed by bolts and has an upward-opening U-shaped cross-section. The top plate 202 is fixed by bolts.

[0043] In this embodiment, the rack 201 and the top plate 202 facilitate the protection of the corresponding air pipes and cables during installation.

[0044] Example 3:

[0045] like Figure 4 As shown, where Figure 4 This is a schematic diagram of the setting position of the rolling ball. Based on the first embodiment, the present invention provides an automotive fuel tank airtightness testing device, which further includes a protective component, including a connecting column 301 and a rolling ball 302.

[0046] The connecting post 301 is integrally formed with the L-shaped plate 111, and multiple of them are arranged at intervals in a straight line. The rolling ball 302 is disposed on the end of the connecting post 301 near the oil tank body 108, and is slidably connected to the left and right sidewall surfaces of the oil tank body 108. The connecting post 301 and the rolling ball 302 are installed and fitted in a one-to-one correspondence.

[0047] In this embodiment, the connecting post 301 and the rolling ball 302 convert the surface contact between the L-shaped plate 111 and the fuel tank body 108 into point contact, reducing the contact area and helping to better protect the surface of the fuel tank body 108.

[0048] like Figure 5 As shown, where Figure 5 This is a flowchart of a method for testing the airtightness of an automotive fuel tank. The present invention provides a method for testing the airtightness of an automotive fuel tank using the aforementioned automotive fuel tank airtightness testing device. The method is characterized by comprising the following steps:

[0049] S1: Adjust the working pressure of the air pipeline according to processing needs;

[0050] S2: The qualified fuel tank body 108 test piece is fixed by the mold components and clamping components to test whether the equipment meets the test standards. After meeting the test standards, the test piece is replaced.

[0051] S3: Connect the outlet side of the gas pipeline 106 to the connector on the top of the fuel tank body 108 to form a gas supply passage.

[0052] S4: The exhaust electric valve 105 is closed, and the intake electric valve 104 is opened and closed after a timed period, so that the inside of the fuel tank body 108 can be filled with compressed air.

[0053] S5: After the compressed air is closed by the intake electric valve 104 and the exhaust electric valve 105, it is stably stored in a closed environment. At this time, the pressure sensor 107 detects the pressure and feeds the data information back to the control PLC. Finally, the data is displayed on the screen of the microcomputer 116.

[0054] S6: If there is a gas leak point in the fuel tank body 108, the pressure detected by the pressure sensor 107 will be lower than the normal value. At this time, the fuel tank body 108 is not airtight.

[0055] S7: After the inspection is completed, the oil tank body 108 is transferred according to whether it is qualified or not.

[0056] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A device for testing the airtightness of an automotive fuel tank, comprising a frame, characterized in that: It also includes detection components; The detection assembly includes a U-shaped frame, a gas distribution seat, an intake electric valve, an exhaust electric valve, an air supply pipe, a pressure sensor, an oil tank body, a mold component, and a clamping component. The U-shaped frame is installed on the rear side of the frame, the gas distribution seat is installed on the top of the U-shaped frame, the intake electric valve is installed on the left air inlet of the gas distribution seat, the exhaust electric valve is installed on the right air outlet of the gas distribution seat, the air supply pipe is connected to the connectors on the top outlet of the gas distribution seat and the oil filling port of the oil tank body, the pressure sensor is installed on the front side of the gas distribution seat, and its detection part extends into the internal T-shaped air passage. The oil tank body is limited and fixed by the mold component and the clamping component.

2. The automotive fuel tank airtightness testing device as described in claim 1, characterized in that... : The mold component includes a bottom mold and mating parts. The bottom mold is fixed on the frame. The mating parts are located in the middle and on both sides of the bottom mold.

3. The automotive fuel tank airtightness testing device as described in claim 2, characterized in that... : The mating components include a limiting plate and an L-shaped plate. The limiting plate is symmetrically installed on the bottom mold and slidably connected to the oil tank body. The L-shaped plate is detachably connected to the frame and symmetrically arranged, and is also detachably connected to the oil tank body.

4. The automotive fuel tank airtightness testing device as described in claim 2, characterized in that... : The clamping component includes a positioning platform and an actuating component. The positioning platform is integrally formed with the bottom mold. The actuating component is located on the side of the positioning platform near the oil tank body.

5. The automotive fuel tank airtightness testing device as described in claim 4, characterized in that... : The actuating components include a corner cylinder and a clamping plate. The corner cylinder is mounted on the top of the positioning platform; the clamping plate is mounted on the output end of the corner cylinder.

6. The automotive fuel tank airtightness testing device as described in claim 1, characterized in that: A control panel and a microcomputer are located on the left side of the rack.

7. The automotive fuel tank airtightness testing device as described in claim 1, characterized in that: The automotive fuel tank air tightness testing device also includes a layout assembly, which includes a layout frame and a top plate. The layout frame is detachably connected to the U-shaped frame and is located on top of the U-shaped frame. The top plate is installed on top of the arrangement frame.

8. A method for testing the airtightness of an automotive fuel tank, employing the automotive fuel tank airtightness testing device as described in any one of claims 1 to 7, characterized in that, The method for testing the airtightness of a vehicle fuel tank includes the following steps: Adjust the working pressure of the air pipeline according to processing requirements; The qualified fuel tank body test piece is fixed by mold components and clamping components to test whether the equipment meets the test standards. After meeting the test standards, the test piece is replaced. Connect the outlet side of the gas pipeline to the connector on the top of the fuel tank body to form a gas supply passage; The exhaust electric valve is closed, and the intake electric valve opens and closes after a time interval, thus filling the inside of the fuel tank with compressed air. After the compressed air is closed by the intake electric valve and the exhaust electric valve, it is stably stored in a closed environment. At this time, the pressure sensor detects the pressure and feeds the data back to the control PLC. Finally, the data is displayed on the microcomputer screen. If there is a gas leak point in the fuel tank, the pressure detected by the pressure sensor will be lower than the normal value. In this case, the fuel tank is not airtight. After the inspection is completed, the fuel tank body is transferred according to whether it passes or fails.

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