An oil-immersed transformer oil leakage detection device

Abstract

The present invention discloses an oil-immersed transformer oil leakage detection device, which relates to the technical field of transformer detection, and comprises a frame, a plurality of movable wheels are fixedly arranged at the bottom of the frame, handles are fixedly arranged on both sides of the frame, a driving mechanism is arranged at the top of the frame, an oil inlet sealing mechanism is arranged at the bottom of the driving mechanism, an observation detection mechanism is fixedly arranged on the right side of the oil inlet sealing mechanism, a closing protection mechanism is slidably arranged at the top of the observation detection mechanism, the closing protection mechanism is connected to the driving mechanism, and a trigger-type air supply mechanism is arranged on the driving mechanism. The present invention can detect the oil tank of the oil-immersed transformer more conveniently, has lower operation difficulty and effectively saves manpower, and is more suitable for industrial detection of oil-immersed transformers.

Description

Technical Field

[0001] The invention relates to the technical field of transformer detection, and in particular to an oil leakage detection device for an oil-immersed transformer. Background Art

[0002] Oil-immersed transformer is one of many types of transformers. The oil tank of the oil-immersed transformer is filled with a large amount of transformer oil. During the use of the transformer, the transformer oil in the tank can cool the transformer. In order to ensure the cooling effect and the service life of the transformer, the oil tank of the oil-immersed transformer must be leak-free. Therefore, the sealing detection of the oil tank of the oil-immersed transformer is particularly important.

[0003] The invention patent with authorization announcement number CN 110726514 B discloses a transformer tank oil leakage detection device, including a fuselage, a working chamber is provided in the fuselage, a lifting mechanism is provided in the working chamber, the lifting mechanism includes a sealing plate arranged on the lower side of the fuselage, an alarm mechanism is provided on the upper side of the lifting mechanism, the alarm mechanism includes a moving block, a moving groove opening forward is provided on the rear end wall of the working chamber, an inflation mechanism is provided on the left side of the alarm mechanism, and the inflation mechanism includes a baffle fixed to the rear end wall of the working chamber.

[0004] The device is easy to operate. After using a sealing plate to block the opening of the oil tank, start the motor and press the device downward. The device can inflate the oil tank. If the oil tank is not leaking, the device will not issue a warning. If the oil tank is leaking, the device will issue a warning. If the seal is not thorough, the motor will idle.

[0005] When the above device is in use, the user is required to place the device on the upper side of the oil tank, cover the opening of the oil tank with a sealing plate, then start the motor, and manually press the fuselage downward to make the sealing plate close to the fuselage. However, when technical personnel in this field actually operate it, considering that the oil tank of the existing oil-immersed transformer is large in size, there are great operational difficulties in placing the device and manually pressing the device. The operation is inconvenient and too labor-intensive, and it cannot be applied to the industrial detection of oil-immersed transformers.

[0006] Therefore, it is necessary to invent an oil-immersed transformer oil leakage detection device to solve the above problems. Summary of the invention

[0007] The object of the present invention is to provide an oil-immersed transformer oil leakage detection device to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an oil-immersed transformer oil leakage detection device, comprising a frame, a plurality of movable wheels are fixedly arranged at the bottom of the frame, handles are fixedly arranged on both sides of the frame, a driving mechanism is arranged at the top of the frame, an oil inlet sealing mechanism is transmission-arranged at the bottom of the driving mechanism, an observation and detection mechanism is fixedly arranged on the right side of the oil inlet sealing mechanism, a closing protection mechanism is slidably arranged at the top of the observation and detection mechanism, the closing protection mechanism is connected to the driving mechanism, and a trigger-type air supply mechanism is transmission-arranged on the driving mechanism.

[0009] Preferably, the driving mechanism comprises a driving motor, a first screw rod, a threaded sleeve and a lifting sleeve plate;

[0010] The driving motor is fixedly arranged on the top of the frame, the first screw is located inside the frame and is drivingly connected to the driving motor, the threaded sleeve is sleeved on the outside of the first screw and is threadedly connected to the first screw, and the lifting sleeve is fixedly sleeved on the outside of the threaded sleeve.

[0011] Preferably, the oil inlet sealing mechanism comprises a sealing housing, a rubber sealing ring, a sliding rod and a first spring;

[0012] The sealing shell is located below the lifting sleeve, the rubber sealing ring is bonded to the bottom opening of the sealing shell, two sliding rods and two first springs are provided, the two sliding rods are respectively fixed on both sides of the top of the sealing shell, the two first springs are respectively sleeved on the outside of the two sliding rods, one end of the first spring is fixedly connected to the sealing shell, and the other end is fixedly connected to the lifting sleeve.

[0013] Preferably, the observation and detection mechanism comprises a mounting plate, a transparent sleeve and a detection airbag;

[0014] The mounting plate is fixedly arranged on the right side of the sealing shell, the transparent sleeve is fixedly arranged on the right side of the mounting plate, and the detection airbag is located inside the transparent sleeve and fixedly connected to the mounting plate.

[0015] Preferably, the closed protection mechanism comprises a rotating block, a telescopic rod, a limit plate, a second spring and a closed protection plate;

[0016] The rotating block is rotatably nested at the bottom end of the first screw rod through a bearing, the telescopic rod is fixedly connected to the bottom of the rotating block, the limit plate is fixedly connected to the bottom end of the telescopic rod, the second spring is sleeved on the outside of the telescopic rod, one end of the second spring is fixedly connected to the rotating block and the other end is fixedly connected to the limit plate, the closed protective plate is fixedly set at the bottom of the second spring, and the closed protective plate is slidably nested at the top right side of the detection airbag.

[0017] Preferably, the trigger-type air supply mechanism comprises a second screw, a lifting and lowering plate, an air supply airbag and an air supply pipeline;

[0018] Two second screws are provided, and the two second screws are respectively penetrated on both sides of the top of the lifting sleeve and are threadedly connected to the lifting sleeve. The top ends of the two second screws are rotatably nested in the inner side of the frame through bearings. The lifting and lowering pressure plate is sleeved on the outside of the two second screws and threadedly connected to the two second screws. The air supply airbag is sleeved on the outside of the first screw and bonded to the inner side of the frame. The bottom end of the air supply pipe is fixedly penetrated on the left side of the top of the sealing shell, and the top end of the air supply pipe is connected to the air supply airbag.

[0019] The present invention also provides a detection method of an oil-immersed transformer oil leakage detection device, which specifically comprises the following steps:

[0020] S1. Push the frame by the handle so that the frame moves to the outside of the oil tank of the oil-immersed transformer through the moving wheels. At this time, the oil inlet sealing mechanism is located directly above the oil inlet of the oil tank;

[0021] S2, start the drive motor, the drive motor drives the first screw to rotate, the first screw rotates and drives the threaded sleeve to descend, the threaded sleeve descends and drives the lifting sleeve to descend synchronously, the lifting sleeve descends and drives the sealing shell to descend synchronously through the sliding rod, the sealing shell descends and drives the detection airbag to descend synchronously, so that the detection airbag moves away from the limit plate;

[0022] S3, when the lifting sleeve plate descends, it synchronously drives the two second screws to rotate, and when the second screws rotate, it drives the lifting and pressing plate to rise, so that the lifting and pressing plate moves toward the direction of the air supply airbag, and when the detection airbag descends, the pressure on the limit plate is gradually released, so that the compressed second spring is gradually restored;

[0023] S4. When the threaded sleeve descends to a first threshold, the second spring is fully restored. When the threaded sleeve descends to a second threshold, the restored second spring drives the closed protection plate to rise through the limit plate, so that the closed protection plate releases the seal on the right end of the detection airbag. At the same time, the sealing shell is pressed against the top of the oil tank through the rubber sealing ring, thereby sealing the oil inlet of the oil tank. In addition, the lifting and lowering plate contacts the air supply airbag.

[0024] S5. Then the threaded sleeve continues to descend. Since the sealed housing cannot continue to descend at this time, the lifting sleeve compresses the first spring, and the lifting and pressing plate compresses the air supply airbag at the same time. The gas inside the air supply airbag enters the sealed housing through the air supply pipe, and part of it enters the detection airbag to expand the detection airbag. At this time, the detection airbag fits with the transparent sleeve, and part of it enters the fuel tank through the fuel inlet on the top of the fuel tank;

[0025] S6. When the threaded sleeve descends to a third threshold, the air supply bag is completely compressed, and then the drive motor is stopped. After a set period of time, the detection bag is observed to see whether it shrinks. When the detection bag shrinks, there is a leak in the detected oil tank. When the detection bag does not shrink, there is no leak in the detected oil tank.

[0026] S7. After the detection is completed, the driving motor drives the first screw to rotate in the reverse direction, so that the driving mechanism drives the oil inlet sealing mechanism, the observation and detection mechanism, the sealing protection mechanism and the trigger-type air supply mechanism to reset.

[0027] Technical effects and advantages of the present invention:

[0028] The present invention is provided with a driving mechanism, an oil inlet sealing mechanism, an observation and detection mechanism, a sealing protection mechanism and a trigger-type air supply mechanism, so that the driving mechanism can be used to drive the oil inlet sealing mechanism, thereby causing the oil inlet sealing mechanism to seal the oil inlet of the oil tank to be detected. At the same time, the driving mechanism drives the trigger-type air supply mechanism during the process of driving the oil inlet sealing mechanism, thereby causing the trigger-type air supply mechanism to supply air to the oil inlet sealing mechanism. In addition, during the process of the oil inlet sealing mechanism being driven, the observation and detection mechanism is driven away from the sealing protection mechanism, thereby releasing the protection of the observation and detection mechanism by the sealing protection mechanism, so that the observation and detection mechanism can subsequently perform normal detection operations. Compared with the same type of devices in the prior art, the present invention can more conveniently detect the oil tank of the oil-immersed transformer, has lower operating difficulty and effectively saves manpower, and is more suitable for industrial detection of oil-immersed transformers. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall front view structure of the present invention.

[0030] Figure 2 It is a front view structural schematic diagram of the driving mechanism, oil inlet sealing mechanism, observation and detection mechanism, sealing and protection mechanism and trigger-type air supply mechanism of the present invention.

[0031] Figure 3 It is a front cross-sectional structural schematic diagram of the driving mechanism and the trigger-type air supply mechanism of the present invention.

[0032] Figure 4 It is a front cross-sectional structural schematic diagram of the driving mechanism and the sealing protection mechanism of the present invention.

[0033] Figure 5 It is a front cross-sectional structural schematic diagram of the oil inlet sealing mechanism and the observation and detection mechanism of the present invention.

[0034] In the figure: 1. frame; 2. moving wheel; 3. handle; 4. driving mechanism; 41. driving motor; 42. first screw; 43. threaded sleeve; 44. lifting sleeve; 5. oil inlet sealing mechanism; 51. sealing shell; 52. rubber sealing ring; 53. sliding rod; 54. first spring; 6. observation and detection mechanism; 61. mounting plate; 62. transparent sleeve; 63. detection airbag; 7. closing protection mechanism; 71. rotating block; 72. telescopic rod; 73. limit plate; 74. second spring; 75. closing protection plate; 8. trigger-type air supply mechanism; 81. second screw; 82. lifting and lowering plate; 83. air supply airbag; 84. air supply pipeline. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] The present invention provides Figure 1-5 An oil-immersed transformer oil leakage detection device shown in the figure includes a frame 1, a plurality of moving wheels 2 are fixedly arranged at the bottom of the frame 1, handles 3 are fixedly arranged on both sides of the frame 1, a driving mechanism 4 is arranged on the top of the frame 1, an oil inlet sealing mechanism 5 is transmission-arranged at the bottom of the driving mechanism 4, an observation and detection mechanism 6 is fixedly arranged on the right side of the oil inlet sealing mechanism 5, a closing protection mechanism 7 is slidably arranged on the top of the observation and detection mechanism 6, the closing protection mechanism 7 is connected to the driving mechanism 4, and a trigger-type air supply mechanism 8 is transmission-arranged on the driving mechanism 4.

[0038] like Figure 3 and Figure 4 As shown, the driving mechanism 4 includes a driving motor 41, a first screw 42, a threaded sleeve 43 and a lifting sleeve 44, wherein the driving motor 41 is fixedly arranged on the top of the frame 1, the first screw 42 is located on the inner side of the frame 1, and is transmission-connected to the driving motor 41, the threaded sleeve 43 is sleeved on the outer side of the first screw 42 and is threadedly connected to the first screw 42, and the lifting sleeve 44 is fixedly sleeved on the outer side of the threaded sleeve 43.

[0039] By setting the above structure, the driving motor 41 can drive the first screw rod 42 to rotate, thereby causing the threaded sleeve 43 to rise and fall. When the threaded sleeve 43 rises and falls, the lifting sleeve plate 44 is driven to rise and fall synchronously.

[0040] like Figure 5As shown, the oil inlet sealing mechanism 5 includes a sealing shell 51, a rubber sealing ring 52, a sliding rod 53 and a first spring 54, wherein the sealing shell 51 is located below the lifting sleeve 44, the rubber sealing ring 52 is bonded to the bottom opening of the sealing shell 51, two sliding rods 53 and two first springs 54 are provided, the two sliding rods 53 are respectively fixedly arranged on both sides of the top of the sealing shell 51, the two first springs 54 are respectively sleeved on the outside of the two sliding rods 53, one end of the first spring 54 is fixedly connected to the sealing shell 51, and the other end is fixedly connected to the lifting sleeve 44.

[0041] By setting the above structure, after the sealing shell 51 descends to the top of the tested oil tank, the oil inlet of the tested oil tank is closed by the rubber sealing ring 52, so that the subsequent airflow entering the inside of the sealing shell 51 can enter the inside of the tested oil tank through the oil inlet.

[0042] like Figure 5 As shown, the observation and detection mechanism 6 includes a mounting plate 61, a transparent sleeve 62 and a detection airbag 63, wherein the mounting plate 61 is fixedly arranged on the right side of the sealing shell 51, the transparent sleeve 62 is fixedly arranged on the right side of the mounting plate 61, and the detection airbag 63 is located inside the transparent sleeve 62 and fixedly connected to the mounting plate 61.

[0043] By setting the above structure, when the airflow enters the detection airbag 63, the detection airbag 63 expands and then fits against the inner wall of the transparent sleeve 62. The technician can determine whether there is a leak in the detected oil tank by observing whether the transparent sleeve 62 continues to fit against the inner wall of the detection airbag 63.

[0044] like Figure 4 As shown, the closed protection mechanism 7 includes a rotating block 71, a telescopic rod 72, a limit plate 73, a second spring 74 and a closed protection plate 75, wherein the rotating block 71 is rotatably nested at the bottom end of the first screw rod 42 through a bearing, the telescopic rod 72 is fixedly connected to the bottom of the rotating block 71, the limit plate 73 is fixedly connected to the bottom end of the telescopic rod 72, the second spring 74 is sleeved on the outside of the telescopic rod 72, one end of the second spring 74 is fixedly connected to the rotating block 71 and the other end is fixedly connected to the limit plate 73, the closed protection plate 75 is fixedly set at the bottom of the second spring 74, and the closed protection plate 75 is slidably nested at the top right side of the detection airbag 63.

[0045] By setting the above structure, the second spring 74 can be used to push the limit plate 73, so that the limit plate 73 is pressed against the top of the transparent sleeve 62, and the closed protective plate 75 at the bottom of the limit plate 73 is located inside the transparent sleeve 62, and the right end opening of the transparent sleeve 62 is closed, so that the detection airbag 63 is protected when the device is on standby, and the detection airbag 63 is prevented from being exposed to the air. When the closed protective plate 75 is removed, the transparent sleeve 62 is connected to the outside world, and the air inside the transparent sleeve 62 can enter the air through the right side opening of the transparent sleeve 62, thereby avoiding affecting the subsequent normal expansion of the detection airbag 63.

[0046] like Figure 3 As shown, the trigger-type air supply mechanism 8 includes a second screw 81, a lifting and pressure plate 82, an air supply bag 83 and an air supply pipe 84, wherein two second screws 81 are provided, and the two second screws 81 are respectively penetrated and arranged on both sides of the top of the lifting sleeve 44, and are both threadedly connected to the lifting sleeve 44, and the top ends of the two second screws 81 are rotatably nested and arranged on the inner side of the frame 1 through bearings, the lifting and pressure plate 82 is sleeved on the outside of the two second screws 81, and is threadedly connected to the two second screws 81, the air supply bag 83 is sleeved on the outside of the first screw 42, and is bonded to the inner side of the frame 1, and the bottom end of the air supply pipe 84 is fixedly penetrated and arranged on the left side of the top of the sealing shell 51, and the top end of the air supply pipe 84 is connected to the air supply bag 83.

[0047] By setting the above structure, the lifting sleeve 44 can drive the lifting and pressing plate 82 to move upward through the second screw 81, so that the lifting and pressing plate 82 can compress the air supply bag 83. When the air supply bag 83 is compressed, air flow is injected into the sealed shell 51 through the air supply pipe 84.

[0048] Example 2

[0049] The present invention also provides a detection method of an oil-immersed transformer oil leakage detection device, which specifically comprises the following steps:

[0050] S1, push the frame 1 through the handle 3, so that the frame 1 moves to the outside of the oil tank of the oil-immersed transformer through the moving wheels 2, and the oil inlet sealing mechanism 5 is located directly above the oil inlet of the oil tank;

[0051] S2, start the drive motor 41, the drive motor 41 drives the first screw 42 to rotate, the first screw 42 rotates and drives the threaded sleeve 43 to descend, the threaded sleeve 43 descends and drives the lifting sleeve 44 to descend synchronously, the lifting sleeve 44 descends and drives the sealing housing 51 to descend synchronously through the sliding rod 53, the sealing housing 51 descends and drives the detection airbag 63 to descend synchronously, so that the detection airbag 63 moves away from the limit plate 73;

[0052] S3, when the lifting sleeve 44 descends, the two second screws 81 are synchronously driven to rotate, and when the second screws 81 rotate, the lifting and lowering pressure plate 82 is driven to rise, so that the lifting and lowering pressure plate 82 moves toward the direction of the air supply airbag 83, and when the detection airbag 63 descends, the pressure on the limit plate 73 is gradually released, so that the compressed second spring 74 is gradually restored;

[0053] S4, when the threaded sleeve 43 descends a distance that reaches a first threshold, the second spring 74 is completely restored. When the threaded sleeve 43 descends a distance that reaches a second threshold, the restored second spring 74 drives the closed protection plate 75 to rise through the limit plate 73, so that the closed protection plate 75 releases the seal on the right end of the detection airbag 63. At the same time, the sealing housing 51 is pressed against the top of the oil tank through the rubber sealing ring 52, thereby sealing the oil inlet of the oil tank. In addition, the lifting and lowering plate 82 contacts the air supply airbag 83.

[0054] S5. Then the threaded sleeve 43 continues to descend. Since the sealed housing 51 cannot continue to descend at this time, the lifting sleeve 44 compresses the first spring 54, and the lifting and pressing plate 82 compresses the air supply airbag 83. The gas inside the air supply airbag 83 enters the sealed housing 51 through the air supply pipe 84, and part of it enters the detection airbag 63 to expand the detection airbag 63. At this time, the detection airbag 63 fits with the transparent sleeve 62, and part of it enters the fuel tank through the fuel inlet on the top of the fuel tank;

[0055] S6, when the threaded sleeve 43 descends a distance reaching a third threshold, the air supply bag 83 is completely compressed, and then the drive motor 41 is stopped. After a set period of time, the detection bag 63 is observed to check whether the detection bag 63 is shrunk. When the detection bag 63 is shrunk, there is a leak in the detected oil tank. When the detection bag 63 is not shrunk, there is no leak in the detected oil tank.

[0056] S7. After the detection is completed, the driving motor 41 drives the first screw 42 to rotate in the reverse direction, so that the driving mechanism 4 drives the oil inlet sealing mechanism 5, the observation and detection mechanism 6, the sealing protection mechanism 7 and the trigger-type air supply mechanism 8 to reset.

[0057] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil-immersed transformer oil leakage detection device, characterized in that: The invention comprises a frame (1), a plurality of moving wheels (2) are fixedly arranged at the bottom of the frame (1), handles (3) are fixedly arranged on both sides of the frame (1), a driving mechanism (4) is arranged at the top of the frame (1), an oil inlet sealing mechanism (5) is arranged at the bottom of the driving mechanism (4), an observation and detection mechanism (6) is fixedly arranged on the right side of the oil inlet sealing mechanism (5), a sealing protection mechanism (7) is slidably arranged at the top of the observation and detection mechanism (6), the sealing protection mechanism (7) is connected to the driving mechanism (4), and a trigger-type air supply mechanism (8) is arranged on the driving mechanism (4); The driving mechanism (4) comprises a driving motor (41), a first screw rod (42), a threaded sleeve (43) and a lifting sleeve plate (44); The driving motor (41) is fixedly arranged on the top of the frame (1); the first screw rod (42) is located inside the frame (1) and is drivingly connected to the driving motor (41); the threaded sleeve (43) is sleeved on the outside of the first screw rod (42) and is threadedly connected to the first screw rod (42); and the lifting sleeve (44) is fixedly sleeved on the outside of the threaded sleeve (43); The oil inlet sealing mechanism (5) comprises a sealing housing (51), a rubber sealing ring (52), a sliding rod (53) and a first spring (54); The sealing shell (51) is located below the lifting sleeve (44), the rubber sealing ring (52) is bonded to the bottom opening of the sealing shell (51), two sliding rods (53) and two first springs (54) are provided, the two sliding rods (53) are respectively fixedly provided on both sides of the top of the sealing shell (51), the two first springs (54) are respectively sleeved on the outside of the two sliding rods (53), one end of the first spring (54) is fixedly connected to the sealing shell (51) and the other end is fixedly connected to the lifting sleeve (44); The observation and detection mechanism (6) comprises a mounting plate (61), a transparent sleeve (62) and a detection airbag (63); The mounting plate (61) is fixedly arranged on the right side of the sealing housing (51), the transparent sleeve (62) is fixedly arranged on the right side of the mounting plate (61), and the detection airbag (63) is located inside the transparent sleeve (62) and is fixedly connected to the mounting plate (61); The closed protection mechanism (7) comprises a rotating block (71), a telescopic rod (72), a limit plate (73), a second spring (74) and a closed protection plate (75); The rotating block (71) is rotatably nested at the bottom end of the first screw rod (42) via a bearing, the telescopic rod (72) is fixedly connected to the bottom of the rotating block (71), the limit plate (73) is fixedly connected to the bottom end of the telescopic rod (72), the second spring (74) is sleeved and arranged on the outside of the telescopic rod (72), one end of the second spring (74) is fixedly connected to the rotating block (71) and the other end is fixedly connected to the limit plate (73), the closed protective plate (75) is fixedly arranged at the bottom of the second spring (74), and the closed protective plate (75) is slidably nested and arranged on the top right side of the detection airbag (63); The trigger-type air supply mechanism (8) comprises a second screw rod (81), a lifting and pressing plate (82), an air supply airbag (83) and an air supply pipeline (84); Two second screw rods (81) are provided, and the two second screw rods (81) are respectively arranged to penetrate through the two sides of the top of the lifting sleeve (44) and are both threadedly connected to the lifting sleeve (44). The top ends of the two second screw rods (81) are rotatably nested in the inner side of the frame (1) through bearings. The lifting and lowering pressure plate (82) is sleeved on the outside of the two second screw rods (81) and is threadedly connected to the two second screw rods (81). The air supply airbag (83) is sleeved on the outside of the first screw rod (42) and is bonded to the inner side of the frame (1). The bottom end of the air supply pipe (84) is fixedly arranged to penetrate through the left side of the top of the sealing shell (51), and the top end of the air supply pipe (84) is connected to the air supply airbag (83).

2. The detection method of an oil-immersed transformer oil leakage detection device according to claim 1 is characterized in that: The specific steps include: S1. Pushing the frame (1) by means of the handle (3) causes the frame (1) to move to the outside of the oil tank of the oil-immersed transformer via the moving wheels (2), and at this time, the oil inlet sealing mechanism (5) is located directly above the oil inlet of the oil tank; S2, starting the driving motor (41), the driving motor (41) drives the first screw (42) to rotate, the first screw (42) drives the threaded sleeve (43) to descend when rotating, the threaded sleeve (43) drives the lifting sleeve (44) to descend synchronously when descending, the lifting sleeve (44) drives the sealing housing (51) to descend synchronously through the sliding rod (53) when descending, the sealing housing (51) drives the detection airbag (63) to descend synchronously when descending, so that the detection airbag (63) moves in a direction away from the limit plate (73); S3, when the lifting sleeve (44) descends, the two second screws (81) are synchronously driven to rotate, and when the second screws (81) rotate, the lifting and lowering pressure plate (82) is driven to rise, so that the lifting and lowering pressure plate (82) moves in a direction close to the air supply airbag (83), and when the detection airbag (63) descends, the pressure on the limit plate (73) is gradually released, thereby gradually restoring the compressed second spring (74); S4, when the threaded sleeve (43) drops a distance that reaches a first threshold, the second spring (74) is completely restored. When the threaded sleeve (43) drops a distance that reaches a second threshold, the restored second spring (74) drives the sealing protection plate (75) to rise via the limit plate (73), so that the sealing protection plate (75) releases the seal on the right end of the detection airbag (63). At the same time, the sealing housing (51) is pressed against the top of the oil tank via the rubber sealing ring (52), thereby sealing the oil inlet of the oil tank. In addition, the lifting and lowering plate (82) contacts the air supply airbag (83); S5. Then, the threaded sleeve (43) continues to descend. Since the sealing housing (51) cannot continue to descend at this time, the lifting sleeve (44) compresses the first spring (54), and at the same time, the lifting and pressing plate (82) compresses the air supply bag (83). The gas inside the air supply bag (83) enters the sealing housing (51) through the air supply pipe (84), and part of it enters the detection bag (63) to expand the detection bag (63). At this time, the detection bag (63) fits with the transparent sleeve (62), and part of it enters the oil tank through the oil inlet at the top of the oil tank; S6, when the threaded sleeve (43) descends a distance reaching a third threshold, the air supply bag (83) is completely compressed, and then the drive motor (41) is stopped. After a set period of time, the detection bag (63) is observed to check whether the detection bag (63) is shrunk. When the detection bag (63) is shrunk, there is a leak in the detected oil tank. When the detection bag (63) is not shrunk, there is no leak in the detected oil tank. S7. After the detection is completed, the driving motor (41) drives the first screw (42) to rotate in the reverse direction, thereby causing the driving mechanism (4) to drive the oil inlet sealing mechanism (5), the observation and detection mechanism (6), the sealing protection mechanism (7) and the trigger-type air supply mechanism (8) to reset.

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