Air tightness detection device for transformer box body

Abstract

The invention relates to the technical field of transformer detection, and discloses a transformer box air tightness detection device which comprises an oil tank. The detection assembly is used for detecting the oil tank sealing performance of the transformer; the detection assembly comprises a sliding pressing plate, the sliding pressing plate is connected to the oil tank in a sliding mode, and a circulating device, a display device and a recording device are arranged on the sliding pressing plate. According to the air tightness detection device for the transformer box body, the air tightness of the oil tank can be rapidly detected through the arranged detection assembly, bubble water does not need to be smeared, whether the air leakage condition exists in the oil tank or not can be directly judged through the pressure value change of the display device, and compared with the mode of manual visual observation of bubbles in the prior art, the detection efficiency is improved. The detection device is more convenient and reliable, the whole detection effect is better, the detection efficiency is better, and meanwhile, the working state of the transformer under complex conditions can be simulated by adopting continuous circulating pressurization and decompression of the circulating device, so that the detection data is more accurate and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of transformer detection, and in particular to a transformer box air tightness detection device. Background Art

[0002] The oil tank of the oil-immersed transformer needs to be tested for air tightness after welding to test the actual use conditions and ensure the quality of the transformer before leaving the factory. The existing detection method is to seal the oil tank first, then manually brush bubble water on the seal of the outer surface of the oil tank, and finally inflate the reserved connection port of the oil tank, and manually observe whether there are bubbles on the surface of the oil tank to determine whether the oil tank is leaking.

[0003] First of all, this detection method is too primitive, and the operation is time-consuming and laborious. When manually inspecting the box, because the working environment of the transformer may have a certain pressure resistance, simply inflating the oil tank may be in good condition at the time, but it is impossible to achieve efficient or high-frequency pressurization and decompression processes to simulate a higher load condition. In addition, if the leakage point of the traditional method is small, it cannot be visually viewed by humans, or the leakage point is at a corner or a dead end and cannot be visually viewed at all. This directly places high demands on manual labor and it is easy to miss detection points. Therefore, a transformer box air tightness detection device is proposed to solve the above-mentioned problems. Summary of the invention

[0004] 1. Technical problems solved: In view of the deficiencies in the prior art, the present invention provides a transformer box air tightness detection device, which solves the problems in the prior art that the air tightness detection of the transformer box is too cumbersome, the detection process is difficult to view, and the detection simulation working conditions are too single.

[0005] (II) Technical solution: To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a transformer box air tightness detection device, comprising an oil tank; a detection component, used to detect the air tightness of the transformer oil tank; the detection component includes a sliding pressure plate, the sliding pressure plate is slidably connected to the oil tank, and a circulation device, a display device and a recording device are arranged on the sliding pressure plate; the circulation device is used to circulate and continuously provide circulation pressure to detect the box; the display device is used to display the real-time air pressure value inside the oil tank; the recording device is used to record the air pressure value during the circulation detection.

[0006] Preferably, the circulation device includes a driving motor, the output end of the driving motor is connected to a reciprocating screw, the reciprocating screw is slidably connected to a reciprocating slide, a pin rod is arranged inside the reciprocating slide, the pin rod is slidably connected to a reciprocating groove on the surface of the reciprocating screw, a guide column is fixedly connected to the reciprocating slide, the left end of the guide column is connected to a piston plate, the surface of the piston plate is slidably connected to an air sleeve, the left end of the air sleeve is connected to a sliding pressure plate through a connecting pipe, and a plurality of air outlets are provided at the bottom of the sliding pressure plate.

[0007] Preferably, the air sleeve is connected with a branch pipe, one end of the branch pipe is connected with a pressure pipe, the pressure pipe is fixedly mounted on a sliding pressure plate, a piston plate is slidingly connected inside the pressure pipe, a pressure spring is connected to the right side of the piston plate, and the right end of the pressure spring is fixed on the right side inside the pressure tube.

[0008] Preferably, two groups of the air sleeves are provided, and the two groups of air sleeves are symmetrically distributed with the center line of the sliding pressure plate as the symmetry axis, and the piston plate is connected to the display device.

[0009] Preferably, the display device includes a dial, a pointer is rotatably connected to the dial, the pointer is connected to a gear plate through an axle, a connecting tooth plate is meshed on the surface of the gear plate, the left side of the connecting tooth plate is connected to a movable pull rod, and the left end of the movable pull rod is fixedly connected to the piston plate.

[0010] Preferably, the recording device comprises an inserting plate, a bottom of the inserting plate is abutted against a paint pen, the paint pen is mounted on the pointer, and the inserting plate is inserted into the sliding pressure plate.

[0011] Preferably, the recording device further comprises a conveying device; The conveying device includes an intermediate gear, a lower rack is meshed on the intermediate gear, an upper rack is clamped on the lower rack through a ratchet, the right end of the upper rack is connected to a push rod through a connecting rod for upward and downward sliding, the right end of the push rod is in contact with the plug plate, and a power rod is connected to the left side of the piston plate, and teeth are arranged on the power rod.

[0012] Preferably, the upper rack is slidably connected to a limit rod via a sliding groove, the surface of the limit rod is slidably connected to a limit sleeve, a small spring is sleeved on the surface of the limit rod, one end of the small spring abuts against the limit sleeve, and the bottom of the small spring abuts against the upper rack.

[0013] Preferably, a card slot is provided on the surface of the oil tank, a sliding slot is provided inside the sliding pressure plate, the sliding slot is slidably inserted into the surface of the oil tank through the card slot, a sealing strip is provided at the bottom of the sliding pressure plate, and a push handle is provided on the sliding pressure plate.

[0014] (III) Beneficial effects: Compared with the prior art, the present invention provides a transformer box air tightness detection device, which has the following beneficial effects: 1. The transformer box air tightness detection device can realize rapid air tightness detection of the oil tank through the detection components set up. There is no need to apply bubble water. It can directly determine whether there is a leak in the oil tank through the change of the pressure value of the display device. Compared with the manual visual observation of bubbles in the prior art, the detection device is more convenient and reliable, and the overall detection effect is better and the detection efficiency is better. At the same time, the continuous circulation of the circulation device is pressurized and depressurized, which can simulate the working state of the transformer in complex situations, making the detection data more accurate and reliable.

[0015] 2. The transformer box air tightness detection device can mark and record the data of each cycle detection through the set recording device. The subsequent operator can also determine whether there is a leak in the oil tank directly based on the markings. The whole process does not require the operator to observe all the time, and only needs to wait for the final test marking length, which provides a more convenient way for batch oil tank production detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a transformer box air tightness detection device proposed by the present invention; Figure 2 It is a structural schematic diagram of an oil-immersed transformer; Figure 3 A schematic diagram of the structure of a detection component of a transformer box air tightness detection device proposed by the present invention; Figure 4 A schematic diagram of the structure of a circulation device and a display device of a transformer box air tightness detection device proposed by the present invention; Figure 5 A schematic diagram of the connection position of a plug board of a transformer box air tightness detection device proposed by the present invention; Figure 6 A schematic diagram of the structure of a display device of a transformer box air tightness detection device proposed by the present invention; Figure 7 A schematic diagram of a connecting structure of a supporting rod of a transformer box air tightness detection device proposed by the present invention; Figure 8 This is a schematic diagram of the structure of a plug board of a transformer box air tightness detection device proposed by the present invention after continuous marking; Fig. 9 This is a schematic diagram of the bottom structure of a sliding pressure plate of a transformer box air tightness detection device proposed by the present invention.

[0017] In the figure: 1, oil tank; 2, detection assembly; 21, sliding pressure plate; 211, air outlet; 212, sliding slot; 22, circulation device; 221, driving motor; 222, reciprocating screw rod; 223, reciprocating slide; 224, pin rod; 225, guide column; 226, piston plate; 227, air sleeve; 228, connecting pipe; 229, branch pipe; 230, pressure pipe; 231, piston plate; 232, pressure spring; 23, display device 2301, dial; 2302, pointer; 2303, gear plate; 2304, connecting tooth plate; 2305, movable pull rod; 24, recording device; 2306, paint pen; 2307, plug plate; 2308, intermediate gear; 2309, power rod; 2310, lower rack; 2311, upper rack; 2312, limit rod; 2313, small spring; 2314, limit sleeve; 2315, push rod; 25, push handle. DETAILED DESCRIPTION

[0018] 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.

[0019] See also Figure 1-Figure 8 A transformer box air tightness detection device comprises an oil tank 1; a detection component 2, used to detect the air tightness of the transformer oil tank 1; the detection component 2 comprises a sliding pressure plate 21, the sliding pressure plate 21 is slidably connected to the oil tank 1, and a circulation device 22, a display device 23 and a recording device 24 are arranged on the sliding pressure plate 21; the circulation device 22 is used for circulating motion to continuously provide circulating pressure to detect the oil tank 1; the display device 23 is used for displaying the real-time air pressure value inside the oil tank 1; the recording device 24 is used for recording the air pressure value during the circulation detection.

[0020] In this embodiment, the circulation device 22 includes a driving motor 221, the output end of the driving motor 221 is connected to a reciprocating screw 222, a reciprocating slide 223 is slidably connected to the reciprocating screw 222, a pin rod 224 is arranged inside the reciprocating slide 223, the pin rod 224 is slidably connected in the reciprocating groove on the surface of the reciprocating screw 222, a guide column 225 is fixedly connected to the reciprocating slide 223, the left end of the guide column 225 is connected to a piston plate 226, the surface of the piston plate 226 is slidably connected to an air sleeve 227, the left end of the air sleeve 227 is connected to the sliding pressure plate 21 through a connecting pipe 228, and a plurality of air outlets 211 are provided at the bottom of the sliding pressure plate 21. The rotation of the driving motor 221 will drive the reciprocating screw 222 to rotate, and then the spiral groove on the surface of the reciprocating screw 222 will drive the reciprocating slide 223 to perform a left and right cyclic motion, and then the reciprocating slide 223 will drive the two guide pillars 225 to move, and the guide pillars 225 will drive the piston plate 226 to slide in the air sleeve 227, so that the internal gas is squeezed and the air pressure is transmitted to the inside of the sliding pressure plate 21 through the connecting pipe 228, and then transmitted to the inside of the oil tank 1 through multiple air outlets 211, so as to pressurize the oil tank 1. If the oil tank 1 is depressurized, it can be directly judged based on the display change value of the display device 23.

[0021] Furthermore, the air sleeve 227 is connected with a branch pipe 229, one end of the branch pipe 229 is connected with a pressure pipe 230, the pressure pipe 230 is fixedly mounted on the sliding platen 21, a piston plate 231 is slidably connected in the pressure pipe 230, a pressure spring 232 is connected to the right side of the piston plate 231, and the right end of the pressure spring 232 is fixed to the right side inside the pressure pipe 230. Two groups of air sleeves 227 are provided, and the two groups of air sleeves 227 are symmetrically distributed with the center line of the sliding platen 21 as the symmetry axis, and the piston plate 231 is connected to the display device 23. The set pressure spring 232 can provide a certain pressure value for the piston plate 231, or in other words, the pressure of the entire oil tank 1 is provided by the compression of the pressure spring 232. Because if the oil tank 1 is well sealed, the air squeezed by the piston plate 226 will act on the piston plate 231 through the pipeline, pushing the piston plate 231 to move right, squeezing the pressure spring 232, and the pressure spring 232 will have a reverse thrust, pushing the piston plate 231 to move left, and then elastically squeezing the airflow at this time, so that it acts on the inside of the oil tank 1.

[0022] Furthermore, the display device 23 includes a dial 2301, on which a pointer 2302 is rotatably connected, and the pointer 2302 is connected to a gear plate 2303 through an axis rod. The surface of the gear plate 2303 is meshed with a connecting tooth plate 2304, and the left side of the connecting tooth plate 2304 is connected to a movable pull rod 2305, and the left end of the movable pull rod 2305 is fixedly connected to the piston plate 231. If the oil tank 1 is in a completely sealed state, the air pressure inside the air sleeve 227 will be transmitted to the inside of the pressure tube 230 through the branch pipe 229, and then the piston plate 231 will be squeezed to slide to the right. Then, the right side of the piston plate 231 is connected to a pressure spring 232. If the oil tank 1 has a slow leak, the sliding length of the piston plate 231 will be different each time. The piston plate 231 is connected to a connecting tooth plate 2304 through a movable pull rod 2305. When the piston plate 231 moves, it will synchronously drive the connecting tooth plate 2304 to slide, and then drive the pointer 2302 to rotate through the meshing of the teeth. Therefore, the operator can check the air pressure value inside the oil tank 1 by the rotation amplitude of the pointer 2302.

[0023] In addition, the recording device 24 includes a plug plate 2307, the bottom of the plug plate 2307 is abutted with a coating pen 2306, the coating pen 2306 is installed on the pointer 2302, and the plug plate 2307 is plugged into the sliding plate 21. When the pointer 2302 rotates, it will drive the coating pen 2306 to rotate, and the coating pen 2306 will make an arc-shaped line at the bottom of the plug plate 2307, and then record the swing of the pointer 2302. Subsequent operators can directly judge the air pressure value of the fuel tank 1 at that time according to the arc angle of the line, and what is recorded at this time is the maximum air pressure value inside the fuel tank 1, and the recording device 24 also records the maximum pressure value of the fuel tank 1, and the maximum pressure value can be used to judge whether the fuel tank 1 is leaking or not. Because if there is a leak, the air pressure value inside the fuel tank 1 will definitely become smaller and smaller.

[0024] In addition, the recording device 24 also includes a conveying device; the conveying device includes an intermediate gear 2308, a lower rack 2310 is meshed on the intermediate gear 2308, an upper rack 2311 is clamped on the lower rack 2310 through a ratchet, the right end of the upper rack 2311 is connected to a push rod 2315 by a connecting rod that slides up and down, the right end of the push rod 2315 is in contact with the plug plate 2307, and a power rod 2309 is connected to the left side of the piston plate 231, and the power rod 2309 is provided with teeth. Because the entire circulation device 22 is in the process of cyclic pressurization and extrusion, a conveying device is set up to continuously push the plug plate 2307 to move slightly, so as to achieve continuous marking and marking. Every time the piston plate 231 slides, it will drive the power rod 2309 to move. When the power rod 2309 moves to the left, it will engage and rotate with the intermediate gear 2308, and then the intermediate gear 2308 will drive the lower rack 2310 to engage and move right. After the lower rack 2310 engages and moves to the right, it will push the upper rack 2311 to move right through the one-way pushing principle of the ratchet, and the upper rack 2311 will drive the push rod 2315 to move right through the connecting rod, and then the push rod 2315 moves right, which will push the plug plate 2307 to move slightly to the right, thereby exposing a blank area for the next pressure arc recording.

[0025] It is worth noting that the upper rack 2311 is slidably connected to the limit rod 2312 through the sliding groove, the surface of the limit rod 2312 is slidably connected to the limit sleeve 2314, and the surface of the limit rod 2312 is sleeved with a small spring 2313, one end of the small spring 2313 is in contact with the limit sleeve 2314, and the bottom of the small spring 2313 is in contact with the upper rack 2311. When a cycle of suction is completed, the middle gear 2308 will be controlled to rotate forward and reverse, and after the middle gear 2308 is reversed, because of the ratchet engagement, the lower rack 2310 will not repeatedly drive the upper rack 2311 to slide back, and under the pressure of multiple small springs 2313, the upper rack 2311 will move up and fluctuate to achieve the sliding of the lower rack 2310, so as to achieve the unidirectional push of the upper rack 2311, and finally ensure the intermittent movement of the plug board 2307, which is convenient for the subsequent continuous marking record.

[0026] It is worth noting that a card slot is provided on the surface of the oil tank 1, and a sliding slot 212 is provided inside the sliding pressure plate 21. The sliding slot 212 is slidably inserted into the surface of the oil tank 1 through the card slot. A sealing strip is provided at the bottom of the sliding pressure plate 21, and a push handle 25 is provided on the sliding pressure plate 21. The card slot of the oil tank 1 itself provides an insertion position for the sliding pressure plate 21, thereby ensuring that the sliding pressure plate 21 will not be displaced by the increase in air pressure during detection. The sealing strip can ensure the sealing of the contact surface between the sliding pressure plate 21 and the oil tank 1, avoiding the situation in which the subsequent detection data is inaccurate due to leakage of the connection gap between the sliding pressure plate 21 and the oil tank 1 during detection.

[0027] Working principle: first, when testing, the entire upper cover of the transformer needs to be taken out, and then the sliding slot 212 on the sliding pressure plate 21 is plugged into the surface slot of the oil tank 1, and then the entire sliding pressure plate 21 sliding cover is set on the upper surface of the oil tank 1 to replace the upper cover of the transformer. After that, the rotation of the driving motor 221 will drive the reciprocating screw 222 to rotate. After that, because of the spiral groove on the surface of the reciprocating screw 222, the reciprocating slide 223 will be driven to perform a left and right cyclic motion. After that, the reciprocating slide 223 will drive the two guide pillars 225 to move. The guide pillars 225 will drive the piston plate 226 to slide in the air sleeve 227, so that the internal gas is squeezed, and the air pressure is transmitted to the inside of the sliding pressure plate 21 through the connecting pipe 228, and then transmitted to the inside of the oil tank 1 through multiple air outlets 211, realizing the process of "flatulence". The purpose of "flatulence" is to increase the internal air pressure of the oil tank 1. If the oil tank 1 is defective or has fine holes, the air pressure generated at this time will be released from the fine holes. Therefore, the piston-like reciprocating motion is used to realize the airtightness detection of the stamping and extraction of the oil tank. If the oil tank 1 is in a completely sealed state, the air pressure inside the air sleeve 227 will be transmitted to the inside of the pressure tube 230 through the branch pipe 229, and then the piston plate 231 will be squeezed to slide to the right. Then, the right side of the piston plate 231 is connected to a pressure spring 232. If the oil tank 1 has a slow leak, the sliding length of the piston plate 231 will be different each time. The piston plate 231 is connected to a connecting tooth plate 2304 through a movable pull rod 2305. When the piston plate 231 moves, it will synchronously drive the connecting tooth plate 2304 to slide, and then drive the pointer 2302 to rotate through the meshing of the teeth. Therefore, the operator can check the air pressure value inside the oil tank 1 by the rotation amplitude of the pointer 2302. If the operator does not see it at that time, a recording device 24 is set up. When the pointer 2302 rotates, it will drive the coating pen 2306 to rotate, and the coating pen 2306 will draw an arc line at the bottom of the plug plate 2307, and then record the swing of the pointer 2302. The subsequent operator can directly judge the air pressure value of the tank 1 at that time based on the arc angle of the line.Because the entire circulation device 22 is in the process of cyclic pressurization and extrusion, a conveying device is set up to continuously push the plug plate 2307 to move slightly, so as to achieve continuous marking and marking. Every time the piston plate 231 slides, it will drive the power rod 2309 to move. When the power rod 2309 moves to the left, it will mesh with the middle gear 2308 and then the middle gear 2308 will drive the lower rack 2310 to mesh and move right. After the lower rack 2310 meshes and moves to the right, it will push the upper rack 2311 to move right through the one-way pushing principle of the ratchet, and the upper rack 2311 The push rod 2315 will be driven to move right through the connecting rod, and then the push rod 2315 will push the plug plate 2307 to move right slightly, thereby exposing a blank area to facilitate the next pressure arc recording. Therefore, when a cycle of suction is completed, the middle gear 2308 will be controlled to rotate forward and reverse. After the middle gear 2308 reverses, because of the ratchet engagement, the lower rack 2310 will not repeatedly drive the upper rack 2311 to return and slide, and will be squeezed by multiple small springs 2313. At this time, the upper rack 2311 will move upward and fluctuate to achieve the sliding and giving way to the lower rack 2310.

[0028] Therefore, the overall technical solution can realize reciprocating squeezing and pumping, thereby testing the air tightness of the oil tank 1, thereby simulating complex working conditions and making the air tightness test of the oil tank 1 more accurate. The actual operation of the oil tank 1 may also be accompanied by high temperature, so a heating module can be provided inside the oil tank 1 as needed, thereby simulating the air tightness state of the oil tank 1 under high temperature again. The external additional conditions are not limited in this embodiment.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A transformer box air tightness detection device, characterized in that: include: Fuel tank (1); A detection component (2) for detecting the sealing performance of an oil tank (1) of a transformer; The detection assembly (2) comprises a sliding pressure plate (21), the sliding pressure plate (21) is slidably connected to the oil tank (1), and a circulation device (22), a display device (23) and a recording device (24) are provided on the sliding pressure plate (21); The circulation device (22) is used for circulating motion to continuously provide circulating pressure to detect the oil tank (1); The display device (23) is used to display the real-time air pressure value inside the oil tank (1); The recording device (24) is used to record the air pressure value during the cycle detection.

2. A transformer box air tightness detection device according to claim 1, characterized in that: The circulation device (22) comprises a driving motor (221), the output end of the driving motor (221) is connected to a reciprocating screw rod (222), a reciprocating slide (223) is slidably connected to the reciprocating screw rod (222), a pin rod (224) is arranged inside the reciprocating slide (223), the pin rod (224) is slidably connected to a reciprocating groove on the surface of the reciprocating screw rod (222), a guide column (225) is fixedly connected to the reciprocating slide (223), the left end of the guide column (225) is connected to a piston plate (226), the surface of the piston plate (226) is slidably connected to an air sleeve (227), the left end of the air sleeve (227) is connected to the sliding pressure plate (21) through a connecting pipe (228), and a plurality of air outlets (211) are provided at the bottom of the sliding pressure plate (21).

3. A transformer box air tightness detection device according to claim 2, characterized in that: The air sleeve (227) is connected to a branch pipe (229), one end of the branch pipe (229) is connected to a pressure pipe (230), the pressure pipe (230) is fixedly mounted on a sliding pressure plate (21), a piston plate (231) is slidably connected inside the pressure pipe (230), a pressure spring (232) is connected to the right side of the piston plate (231), and the right end of the pressure spring (232) is fixed to the right side inside the pressure pipe (230).

4. A transformer box air tightness detection device according to claim 3, characterized in that: Two groups of the air sleeves (227) are provided, and the two groups of air sleeves (227) are symmetrically distributed with the center line of the sliding pressure plate (21) as the symmetry axis, and the piston plate (231) is connected to the display device (23).

5. A transformer box air tightness detection device according to claim 4, characterized in that: The display device (23) comprises a dial (2301), a pointer (2302) is rotatably connected to the dial (2301), the pointer (2302) is connected to a gear plate (2303) via a shaft, a connecting tooth plate (2304) is meshed on the surface of the gear plate (2303), a movable pull rod (2305) is connected to the left side of the connecting tooth plate (2304), and the left end of the movable pull rod (2305) is fixedly connected to the piston plate (231).

6. A transformer box air tightness detection device according to claim 5, characterized in that: The recording device (24) comprises an inserting plate (2307), the bottom of which is abutted against a paint pen (2306), the paint pen (2306) being mounted on the pointer (2302), and the inserting plate (2307) being inserted into the sliding pressure plate (21).

7. A transformer box air tightness detection device according to claim 6, characterized in that: The recording device (24) further comprises a conveying device; The conveying device comprises an intermediate gear (2308), a lower rack (2310) meshing on the intermediate gear (2308), an upper rack (2311) being clamped on the lower rack (2310) via ratchet teeth, the right end of the upper rack (2311) being connected to a push rod (2315) by sliding up and down via a connecting rod, the right end of the push rod (2315) being in contact with the plug plate (2307), the left side of the piston plate (231) being connected to a power rod (2309), and teeth being arranged on the power rod (2309).

8. A transformer box air tightness detection device according to claim 7, characterized in that: The upper rack (2311) is slidably connected to a limit rod (2312) via a sliding groove; the surface of the limit rod (2312) is slidably connected to a limit sleeve (2314); a small spring (2313) is sleeved on the surface of the limit rod (2312); one end of the small spring (2313) abuts against the limit sleeve (2314); and the bottom of the small spring (2313) abuts against the upper rack (2311).

9. A transformer box air tightness detection device according to claim 1, characterized in that: The surface of the oil tank (1) is provided with a card slot, the interior of the sliding pressure plate (21) is provided with a sliding slot (212), the sliding slot (212) is slidably plugged into the surface of the oil tank (1) through the card slot, a sealing strip is provided at the bottom of the sliding pressure plate (21), and a push handle (25) is provided on the sliding pressure plate (21).

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