Fuel tank air tightness detection device

Abstract

The utility model discloses an oil tank air tightness detection device. The device comprises an installation support; the lifting mechanism is fixed in the mounting support and comprises a mounting plate, a lifting air cylinder is fixed on the mounting plate, a lifting support is fixedly connected onto an air cylinder rod of the lifting air cylinder and comprises an upper support and a lower support, the lower support is rotatably connected onto the upper support, and the lifting air cylinder is fixed on the mounting plate. A rotation driving structure for driving the lower bracket to rotate is also fixed on the upper bracket; the gas injection mechanism comprises a gas injection cylinder, the gas injection cylinder is fixed on the bottom beam of the lower support, and the gas injection cylinder is further provided with a sealing positioning structure matched with the oil injection hole of the oil tank; and an air tightness detection box. The air tightness detection device is simple in structure, can realize rapid positioning and fastening of the oil tank, thereby realizing detection of the air tightness of the oil tank, and is accurate in detection result, and the top and the bottom of the oil tank can be accurately detected.

Description

Technical Field

[0001] The utility model belongs to the field of air tightness detection, and in particular relates to an oil tank air tightness detection device. Background Art

[0002] Airtightness is a key metric in the qualification testing of automotive fuel tanks. In existing technologies, this is typically done manually, where an operator partially or completely immerses the tank in water and then introduces gas to observe whether bubbles are generated. This method has several significant drawbacks, one of which is its reliance on the operator's experience and observation skills, which can lead to subjective judgments and inconsistent results. Furthermore, manual operation can be not only time-consuming and labor-intensive, but also carries the risk of improper operation, such as missed inspections due to unobservable bubbles. Furthermore, observing only the top and sides of the tank will not yield accurate results, as bubbles may adhere to the outer wall of the bottom if there are air holes at the bottom, making them invisible. Utility Model Content

[0003] In order to solve one or more of the above-mentioned defects in the prior art, the utility model provides a fuel tank air tightness detection device, which has a simple structure and can realize rapid positioning and tightening of the fuel tank, thereby realizing the detection of the air tightness of the fuel tank, and the detection result is accurate, and both the top and bottom of the fuel tank can be accurately detected.

[0004] To achieve the above objectives, the present invention provides a fuel tank air tightness detection device, comprising:

[0005] a mounting bracket;

[0006] A lifting mechanism, the lifting mechanism being fixed in the mounting bracket, comprising a mounting plate, a lifting cylinder being fixed to the mounting plate, a lifting bracket being fixedly connected to the cylinder rod of the lifting cylinder, the lifting bracket comprising an upper bracket and a lower bracket, the lower bracket being rotatably connected to the upper bracket, and a rotary drive structure being further fixed to the upper bracket for driving the lower bracket to rotate;

[0007] An air injection mechanism, comprising an air injection cylinder fixed to the bottom beam of the lower bracket, with a plurality of air injection holes formed in the air injection cylinder, the air injection holes being connected to an air pipe, and a sealing positioning structure matching the oil filling hole of the oil tank on the air injection cylinder;

[0008] An airtightness detection box is fixed on the mounting bracket.

[0009] Furthermore, the rotary drive structure is a rotary cylinder, which is fixed on one side beam of the upper bracket, one side beam of the lower bracket is fixedly connected to the cylinder rod of the rotary cylinder, and the other side beam of the lower bracket is rotatably connected to the upper bracket.

[0010] Furthermore, a plurality of guide columns are fixed on the top beam of the upper bracket, and the guide columns are slidably connected to the mounting plate.

[0011] Furthermore, the sealing positioning structure includes a positioning ring, and limit pins are provided on both sides of the gas injection cylinder. The limit pins are located above the positioning ring. A sealing groove is provided on the inner side of the positioning ring, and a sealing gasket is fixedly connected to the sealing groove.

[0012] Furthermore, a plurality of sliding wheels are connected to the bottom of the mounting bracket.

[0013] Furthermore, the gas injection cylinder is detachably connected to the bottom beam of the lower bracket via a flange ring at the bottom.

[0014] The beneficial effects of the utility model are:

[0015] 1. The air tightness detection device has a simple structure and can realize the rapid positioning and tightening of the fuel tank, which reduces the difficulty of operation, thereby realizing the air tightness detection of the fuel tank and the detection results are accurate;

[0016] 2. The rotating cylinder can realize the 180-degree flip of the fuel tank, thereby testing the upper shell and bottom shell of the fuel tank, ensuring a comprehensive and thorough judgment of the air tightness of the entire fuel tank, and ensuring the safety and stability of the fuel tank under various working conditions;

[0017] 3. By setting the sealing positioning structure on the gas injection cylinder, the oil tank can be firmly positioned when it is positioned, and at the same time, the sealing of the detection can be guaranteed to avoid gas overflow when injecting gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural diagram of the utility model;

[0019] Figure 2 It is a side view of the utility model;

[0020] Figure 3 This is a cross-sectional structural diagram of the sealing and positioning structure of the utility model;

[0021] Figure 4 It is a cross-sectional view of the bottom surface of the fuel tank shell of the utility model;

[0022] Figure 5 It is a structural diagram of the gas injection cylinder of the present utility model;

[0023] Figure: 1. Mounting bracket; 2. Mounting plate; 3. Lifting cylinder; 4. Lifting bracket; 5. Upper bracket; 6. Lower bracket; 7. Gasket; 8. Bottom beam; 9. Gasket hole; 10. Air pipe; 11. Oil tank oil filling hole; 12. Air tightness test box; 13. Rotating cylinder; 14. Side beam; 15. Guide column; 16. Positioning ring; 17. Sealing groove; 18. Sealing gasket; 19. Sliding wheel; 20. Flange ring; 21. Bevel edge; 22. Notch; 23. Oil tank; 24. Oil inlet nozzle; 25. Stop pin. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0025] See also Figures 1 to 5 The fuel tank air tightness detection device shown includes:

[0026] A mounting bracket 1;

[0027] A lifting mechanism, which is fixed in a mounting bracket 1 and includes a mounting plate 2, a lifting cylinder 3 fixed to the mounting plate 2, a lifting bracket 4 fixedly connected to the cylinder rod of the lifting cylinder 3, and the lifting bracket 4 including an upper bracket 5 and a lower bracket 6, the lower bracket 6 being rotatably connected to the upper bracket 5, and a rotary drive structure for driving the lower bracket 6 to rotate being further fixed to the upper bracket 5;

[0028] An air injection mechanism, comprising an air injection cylinder 7, fixed to a bottom beam 8 of a lower support 6, with a plurality of air injection holes 9 formed in the air injection cylinder 7, the air injection holes 9 being connected to an air pipe 10, and a sealing positioning structure matching an oil injection hole 11 of an oil tank 23 on the air injection cylinder 7;

[0029] An airtightness detection box 12 is fixed on the mounting bracket 1 .

[0030] The process of the present invention when in use is as follows: when it is necessary to test the air tightness of the oil tank 23, a large amount of clean water is first injected into the air tightness test box 12 (about two-thirds of the height), and then the cylinder rod of the lifting cylinder 3 of the lifting mechanism rises upward, driving the lifting bracket 4 to rise upward. After the lifting bracket 4 rises, the gas injection cylinder 7 on the gas injection mechanism thereon is above the water surface. At this time, the oil tank 23 is fastened and connected. When the oil tank 23 is fastened and connected, the sealing positioning structure of the oil inlet nozzle 24 on the oil filling hole 11 of the oil tank 23 and the gas injection cylinder 7 is To match, the lifting cylinder 3 drives the lifting bracket 4 to move downward, so that the fuel tank 23 is submerged in water, and then a certain amount of gas is introduced into the fuel tank 23. After the gas is introduced, the pressure is maintained for 20 seconds, and the upper surface and side surfaces of the fuel tank 23 shell are observed to see if there are bubbles. Then, the rotary drive mechanism thereon drives the lower bracket 6 to rotate, so that the fuel tank 23 shell is turned over 180 degrees, so that the bottom surface of the fuel tank 23 shell can be observed (when turning over, the fuel tank 23 shell is always submerged in water). If there are no bubbles on the bottom surface, it means that the fuel tank 23 is of qualified quality.

[0031] Furthermore, the rotation drive structure is a rotary cylinder 13, which is fixed to one side beam 14 of the upper bracket 5. One side beam 14 of the lower bracket 6 is fixedly connected to the cylinder rod of the rotary cylinder 13, and the other side beam 14 of the lower bracket 6 is rotatably connected to the upper bracket 5. Specifically, the present invention drives the lower bracket 6 to rotate via the rotary cylinder 13, and when the lower bracket 6 rotates, it drives the oil tank 23 to rotate.

[0032] Furthermore, a plurality of guide posts 15 are fixed to the top beam of the upper bracket 5, and the guide posts 15 are slidably connected to the mounting plate 2. Specifically, the provision of the guide posts 15 prevents the lifting bracket 4 from rotating during lifting and lowering, and allows it to maintain vertical movement without deflection due to the deflection of the cylinder.

[0033] Furthermore, the sealing positioning structure includes a positioning ring 16, and limit pins 25 are provided on both sides of the gas injection cylinder 7. The limit pins 25 are located above the positioning ring 16, and a sealing groove 17 is provided on the inner side of the positioning ring 16. A sealing gasket 18 is fixedly connected to the sealing groove 17. Specifically, when positioning the oil tank 23 of the utility model, the oil tank 23 is first connected to the gas injection cylinder 7 through the oil inlet nozzle 24 above it. When connecting, the two notches 22 on the oil inlet nozzle 24 pass directly through the limit pins 25, and then the oil tank 23 is rotated. Since the oil inlet nozzle 24 also has two centrally symmetrical sloped edges 21, in the rotating state, the two sloped edges gradually clamp with the limit pins 25, thereby realizing the positioning of the oil tank 23. After positioning, the oil inlet nozzle 24 will be squeezed with the sealing gasket 18 to complete the sealing of the oil inlet nozzle 24.

[0034] Furthermore, a plurality of sliding wheels 19 are connected to the bottom of the mounting bracket 1. Specifically, through the connection of the sliding wheels 19, the mounting bracket 1 of the present invention can be moved more conveniently, and only needs to be pushed. The sliding wheels 19 can be universal wheels, which are more convenient when turning in different directions.

[0035] Furthermore, the gas injection cylinder 7 is detachably connected to the bottom beam 8 of the lower bracket 6 through a flange ring 20 at the bottom.

[0036] Specifically, since the gas injection cylinder 7 is detachably connected, it can be replaced according to different models of products, making the application range of the utility model wider.

[0037] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. A fuel tank air tightness detection device, characterized in that: include: a mounting bracket; A lifting mechanism, the lifting mechanism being fixed in the mounting bracket, comprising a mounting plate, a lifting cylinder being fixed to the mounting plate, a lifting bracket being fixedly connected to the cylinder rod of the lifting cylinder, the lifting bracket comprising an upper bracket and a lower bracket, the lower bracket being rotatably connected to the upper bracket, and a rotary drive structure being further fixed to the upper bracket for driving the lower bracket to rotate; An air injection mechanism, comprising an air injection cylinder fixed to the bottom beam of the lower bracket, with a plurality of air injection holes formed in the air injection cylinder, the air injection holes being connected to an air pipe, and a sealing positioning structure matching the oil filling hole of the oil tank on the air injection cylinder; An airtightness detection box is fixed on the mounting bracket.

2. The fuel tank air tightness detection device according to claim 1, characterized in that: The rotary drive structure is a rotary cylinder, which is fixed on one side beam of the upper bracket. One side beam of the lower bracket is fixedly connected to the cylinder rod of the rotary cylinder, and the other side beam of the lower bracket is rotatably connected to the upper bracket.

3. The fuel tank air tightness detection device according to claim 2, characterized in that: A plurality of guide columns are also fixed on the top beam of the upper bracket, and the guide columns are slidably connected in the mounting plate.

4. The fuel tank air tightness detection device according to claim 3, characterized in that: The sealing positioning structure includes a positioning ring. Limit pins are provided on both sides of the gas injection cylinder. The limit pins are located above the positioning ring. A sealing groove is provided on the inner side of the positioning ring. A sealing gasket is fixedly connected to the sealing groove.

5. The fuel tank air tightness detection device according to claim 4, characterized in that: A plurality of sliding wheels are connected to the bottom of the mounting bracket.

6. The fuel tank air tightness detection device according to claim 5, characterized in that: The gas injection cylinder is detachably connected to the bottom beam of the lower bracket through a flange ring at the bottom.

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