An oil tank leak detection tool

Abstract

An oil tank leak detection tool, comprising a test table, a ventilation hole is arranged through the test table, a fixed column is arranged on the test table, the fixed column is arranged around the ventilation hole, and an auxiliary test device is detachably arranged on the end of the fixed column away from the test table; the upper surface of the test table is further provided with a plurality of lifting devices, and the end of each lifting device away from the test table is provided with a pressing device. The device with positioning and supporting effect composed of the fixed column and the detachable auxiliary test device is arranged above the test table, and combined with the surrounding multiple lifting devices and the pressing device, the oil tank can be quickly and accurately positioned and pressed on the test station. The sealing surface between the opening end of the oil tank and the auxiliary test device can be effectively ensured to be uniformly stressed, the misjudgment caused by insufficient local pressing force is avoided, and the accuracy and reliability of the leak detection test are significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of oil tank sealing detection, specifically an oil tank leak detection tool. Background Technology

[0002] As a key component in power transformers, the oil conservator's core function is to regulate the volume of insulating oil, isolate it from air and moisture, and ensure the stability of the insulating medium's performance. Therefore, the sealing performance of the oil conservator is one of the fundamental indicators for measuring its quality and ensuring the safe operation and service life of power equipment. If the oil conservator has pinholes, cracks, or welding defects leading to leakage, it will not only accelerate the aging of the insulating oil but may also cause serious equipment failures, threatening the safety of the power grid.

[0003] Currently, some existing leak detection fixtures suffer from poor versatility and low automation. They typically lack effective positioning and rapid tightening mechanisms, relying on manual tightening by operators during testing. This is not only inefficient and labor-intensive but can also lead to uneven tightening force, affecting the sealing surface and resulting in false positives or false negatives. Furthermore, traditional fixtures often lack integrated standardized air circuit interfaces and pressure monitoring points. Controlling the inflation pressure and holding pressure depends on the operator's experience, making it difficult to guarantee the accuracy and repeatability of test results. Utility Model Content

[0004] To address the problems of poor versatility, low automation, and excessive reliance on operator experience in the aforementioned leak detection devices, this utility model provides a leak detection fixture for oil storage tanks.

[0005] The technical solution of this utility model is as follows: A leak detection fixture for an oil tank includes a test platform with a ventilation hole for connecting to an external air source. A fixed column is also provided on the test platform, surrounding the ventilation hole. An auxiliary testing device for placing the oil tank is detachably provided at the end of the fixed column away from the test platform. The upper surface of the test platform is also equipped with multiple lifting devices. The lifting devices are evenly arranged around the outer perimeter of the fixed column, and each lifting device is equipped with a clamping device for fixing the oil tank at the end away from the test platform.

[0006] To facilitate airtightness testing, the bottom of the ventilation hole is connected to a pressure testing instrument via a pipe.

[0007] Preferably, the clamping device includes a pneumatic motor and a pressure rod mounted on the pneumatic motor drive shaft and capable of rotating with the drive shaft, wherein the rotation path of the pneumatic motor is a fixed path.

[0008] To facilitate support of the oil tank to be tested, the auxiliary testing device includes a hollow bearing column connected to the top of a fixed column. The end of the bearing column away from the fixed column extends into a disc-shaped structure away from the axis, and the outer diameter of the disc-shaped structure is larger than the outer diameter of the bearing column that cooperates with the fixed column.

[0009] To improve the sealing performance of the leak detection device, a sealing ring is provided on the support column to form a sealing fit with the open end of the oil tank.

[0010] Preferably, the radial length of the sealing ring is less than the difference between the outer diameter and the inner diameter of the bearing column disc structure.

[0011] Preferably, the test platform is movable.

[0012] To enable the leak detection device to adapt to oil tanks of different shapes, a sealing end cap is also included, which is used to be installed at the end of the through-hole oil tank away from the test platform.

[0013] Preferably, a seal is provided on the side of the sealed end cap that contacts the oil tank.

[0014] Preferably, the lifting device is selected from a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

[0015] The beneficial effects of this utility model are as follows: This invention utilizes a positioning and support device, consisting of a fixed column and a detachable auxiliary testing unit, installed above the test platform. Combined with multiple surrounding lifting and clamping devices, this allows for the rapid and accurate positioning and clamping of the oil tank onto the test station. This multi-point coordinated clamping method effectively ensures uniform force on the sealing surface between the oil tank opening and the auxiliary testing unit, avoiding misjudgments caused by insufficient local clamping force and significantly improving the accuracy and reliability of leak detection testing.

[0016] In addition, the auxiliary testing device and the fixed column adopt a detachable structure, which can replace the auxiliary testing device of different specifications according to different types of oil tanks. It can be quickly adapted to various models of oil tanks for testing, which greatly improves the utilization rate of tooling and testing efficiency. Attached Figure Description

[0017] The advantages and solutions of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention.

[0018] In the attached diagram: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a front view of the structure of this utility model; Figure 3 This is a schematic diagram of the working structure of this utility model (the oil tank is a single channel); Figure 4 This is a schematic diagram of the working structure of this utility model (the oil tank is open at both ends).

[0019] The components represented by the various reference numerals in the diagram are: 1. Test platform; 2. Ventilation hole; 3. Fixed column; 4. Auxiliary test device; 5. Lifting device; 6. Clamping device; 61. Pneumatic motor; 62. Pressure rod; 7. Sealing ring; 8. Sealing end cap. Detailed Implementation

[0020] Example 1 A leak detection fixture for oil storage tanks, such as Figure 3 As shown, the main body of the oil tank to be leak-tested in this embodiment is cylindrical with a flange at the open end.

[0021] like Figure 1-3 As shown, the leak detection fixture for the oil tank includes a freely movable test platform 1. A ventilation hole 2 for connecting to an external air source is provided through the surface of the test platform 1. The ventilation hole 2 is located in the middle of the test platform 1, and its bottom is connected to a pressure testing instrument via a valve and pipe (the connection to the pressure testing instrument is a conventional connection and is omitted in the figure). This connection is used to fill the oil tank with detection gas and monitor internal pressure changes in real time. The pressure testing instrument here is also a conventional gas filling and testing device of existing technology, and will not be described in detail further.

[0022] To achieve positioning and bottom sealing of the oil tank, a fixed column 3 is fixedly installed on the upper surface of the test platform 1. The fixed column 3 is arranged around the ventilation hole 2 and is a hollow cylinder.

[0023] An auxiliary testing device 4 is detachably connected to the end of the fixed column 3 away from the test platform 1. The auxiliary testing device 4 specifically includes a hollow support column. The lower end of the support column is connected to the fixed column 3, and the upper end extends into a disc-shaped structure away from the axis. The outer diameter of the disc-shaped structure is larger than the outer diameter of the support column, thus forming a support surface. An annular groove is formed on the upper surface of the disc-shaped structure of the auxiliary testing device 4. A sealing ring 7 is embedded in the annular groove to form a sealing fit with the opening end of the oil tank. Preferably, the radial length of the sealing ring 7 is smaller than the difference between the outer diameter of the disc-shaped structure and the outer diameter of the support column.

[0024] The auxiliary testing device 4 is fixed to the fixed column 3 by a threaded connection and sealed by sealant or bolt preload. The auxiliary testing device 4 can be replaced according to the oil tank of different diameters. After replacement, the diameter of the auxiliary testing device 4 at the end away from the fixed column 3 changes, while the end that mates with the fixed column 3 remains the same diameter. The height of different auxiliary testing devices 4 can be different, but the engagement length of the thread that mates with the fixed column 3 is the same.

[0025] In order to better press and fix the oil tank, multiple lifting devices 5 are also provided on the surface of the test platform 1. The multiple lifting devices 5 are arranged around the outside of the fixed column 3. In this embodiment, there are 6 lifting devices 5.

[0026] The lifting device 5 can be a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder, and is evenly arranged around the outer periphery of the fixed column 3.

[0027] In this embodiment, the lifting device 5 is a cylinder. The cylinder has simple power and stable operation. It adopts the existing technology of synchronous pipeline connection. A single main air pipe branches to each cylinder. The flow distribution is dynamically adjusted by a self-adjusting synchronous valve to compensate for the friction or load difference between the cylinders (this is common knowledge, and the pipeline is omitted in the figure).

[0028] Each lifting device 5 has a pressing device 6 installed at the top of its piston rod. The pressing device 6 includes a pneumatic motor 61 and a pressure rod 62 mounted on the drive shaft of the pneumatic motor 61. The pneumatic motor 61 can drive the pressure rod 62 to rotate in the pressing direction, and its rotation path is limited to a fixed 90-degree arc.

[0029] The pneumatic motor 61 is a general mechanical component, and its pipeline synchronous connection method is similar to the pipeline synchronous connection method of multiple cylinders mentioned earlier, so it will not be described again.

[0030] It is worth noting that the different auxiliary testing devices 4 mentioned earlier can have different heights so that after placing different oil tanks above the auxiliary testing devices 4, they can be matched as closely as possible to the operating stroke of the lifting device 5. In other words, the height of the lifting device 5 after extension should be slightly greater than the height of the top of the flange at the edge of the oil tank, by a controllable distance D. This ensures reliable sealing force during testing without damaging any working components due to overpressure. This distance D is easily determined based on the cylinder model and the required clamping force, and this embodiment does not impose specific limitations.

[0031] See attached document Figure 1-3When using this device, firstly, select an auxiliary testing device 4 of appropriate height according to the height of different oil tanks, and fix the auxiliary testing device 4 to the fixed column 3 by threaded connection, ensuring a seal. Then, place the oil tank with the opening facing down on the auxiliary testing device 4, aligning its port with the sealing ring 7 and pressing it against the surface of the sealing ring 7. Start the lifting device 5 to raise it to the predetermined height, then start the pneumatic motor 61 to rotate the pressure rod 62 above the oil tank flange, and then lower the lifting device 5 to press the oil tank flange tightly. Compressed air is injected through the ventilation hole 2, and the pressure is maintained for a period of time. Observe the change in the reading of the pressure testing instrument to determine the sealing performance of the oil tank.

[0032] Example 2 See Figure 4 This embodiment, based on Embodiment 1, is adapted to the testing requirements of an oil tank with two through channels. Similar to Embodiment 1, this embodiment also includes a test platform 1, ventilation holes 21, a fixed column 3, an auxiliary testing device 4, a sealing ring 7, a lifting device 5, and a clamping device 6 consisting of a pneumatic motor 61 and a pressure rod 62. The difference is that, to achieve complete sealing of the dual-channel oil tank, this embodiment adds a sealing end cap 8. The sealing end cap 8 is used to close the channel opening at the end of the oil tank away from the test platform 1. A sealing element, which can be another sealing ring or a sealing gasket, is also provided on the side of the sealing end cap 8 that contacts the end face of the oil tank.

[0033] Accordingly, in order to match the travel of the lifting device 5 and provide appropriate sealing pressure, this embodiment also ensures that the height of the extended lifting device 5 is slightly larger than the top height of the sealing end cap 8. The controllable distance D of the extra height is also easy to determine according to the cylinder model and the required pressure.

[0034] See attached document Figure 4 When using this device, firstly, select an auxiliary testing device 4 of appropriate height according to the height of different oil tanks, and fix the auxiliary testing device 4 to the fixed column 3 by threaded connection, and ensure sealing. Then, place the oil tank opening downwards on the auxiliary testing device 4, align its port with the sealing ring 7, and press it on the surface of the sealing ring 7. After that, place the sealing element and sealing end cap 8 at the upper opening of the oil tank. The subsequent pressing, inflation and testing steps are the same as in Example 1. When pressing, the pressure rod 62 is in direct contact with the sealing end cap 8.

Claims

1. An oil tank leak detection tooling comprising a test bed (1) characterised in that, The test platform (1) is provided with a ventilation hole (2) for connecting to an external air source. The test platform (1) is also provided with a fixed column (3). The fixed column (3) is arranged around the ventilation hole (2). The end of the fixed column (3) away from the test platform (1) is detachably provided with an auxiliary test device (4) for placing an oil tank. The upper surface of the test platform (1) is also provided with multiple lifting devices (5). The lifting devices (5) are evenly arranged around the circumferential outer side of the fixed column (3), and each lifting device (5) is provided with a clamping device (6) for fixing the oil tank at one end away from the test platform (1).

2. The oil tank leak detection tool of claim 1, wherein, The bottom of the ventilation hole (2) is connected to a pressure testing instrument via a pipe.

3. The oil tank leak detection tool of claim 1, wherein, The pressing device (6) includes a pneumatic motor (61) and a pressure rod (62) mounted on the transmission shaft of the pneumatic motor (61) and capable of rotating with the transmission shaft. The rotation path of the pneumatic motor (61) is a fixed path.

4. The oil tank leak detection tool of claim 1, wherein, The auxiliary testing device (4) includes a hollow bearing column connected to the top of the fixed column (3). The end of the bearing column away from the fixed column (3) extends to the side away from the axis with a disc-shaped structure, and the outer diameter of the disc-shaped structure is larger than the outer diameter of the bearing column that cooperates with the fixed column (3).

5. The oil tank leak detection tool of claim 4, wherein, The support column is provided with a sealing ring (7) for forming a sealing fit with the open end of the oil tank.

6. The oil tank leak detection tool of claim 5, wherein, The radial length of the sealing ring (7) is less than the difference between the outer diameter and the inner diameter of the bearing column disc structure.

7. The oil tank leak detection tool of claim 1, wherein, The test platform (1) is movable.

8. The oil tank leak detection tool of claim 1, wherein, It also includes a sealing end cap (8), which is used to be located at the end of the through oil tank away from the test platform (1).

9. The oil tank leak detection tool of claim 8, wherein, A seal is provided on the side of the sealed end cap (8) that contacts the oil tank.

10. The oil tank leak detection tool of claim 2, wherein, The lifting device (5) can be a pneumatic cylinder, a hydraulic cylinder, or an electric cylinder.

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