High-voltage lead fixing and shockproof structure of marine transformer

Abstract

The application relates to the technical field of transformers, in particular to a high-voltage lead fixing and shockproof structure of a marine transformer, which comprises an iron core clamping frame and a support plate fixedly installed on the iron core clamping frame, a control cylinder is fixedly arranged on the support plate, an insulator is arranged at the end position of the control cylinder, a high-voltage lead is fixed at one end of the insulator away from the control cylinder, and a connecting end seat is fixedly installed at one end of the insulator close to the control cylinder; the high-voltage lead of the transformer can be fixed and supported; when the start-stop frequency of the transformer is higher than a set value, the insulator can axially and radially move, and the thermal expansion and cold contraction stress of the high-voltage lead can be released.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically to a high-voltage lead fixing and shockproof structure for a marine transformer. Background Technology

[0002] The high-voltage leads of a transformer are conductive connecting segments from the end of the high-voltage coil winding to the high-voltage bushing, used to lead high-voltage electricity from the coil to the external power grid. Most high-voltage leads are made of copper busbars or copper tubing. To fix the high-voltage leads and prevent shock during transportation, existing technologies use insulators to support them. The high-voltage leads are locked to the insulators with screws, and the insulators are then fixed to the core frame with screws. However, in actual use, it has been found that transformers frequently start and stop under certain operating conditions. After each shutdown, the transformer temperature gradually decreases, and after startup, it gradually rises. Under conditions of high start-stop frequency, due to large and frequent temperature fluctuations, the rigid support and fixation of the high-voltage leads by the insulators can lead to bending stress, making them prone to fatigue cracking. Compared to high-voltage leads under stable temperature conditions, their lifespan is significantly shortened. Summary of the Invention

[0003] The purpose of this invention is to provide a high-voltage lead fixing and shockproof structure for marine transformers, which can provide rigid support for the high-voltage lead during transportation and handling or under stable temperature conditions, and release the thermal expansion and contraction stress of the high-voltage lead under conditions of large temperature fluctuations and high frequency of fluctuations, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high-voltage lead fixing and shockproof structure for a marine transformer, comprising a core clamp frame and a support plate fixedly mounted on the core clamp frame. A control cylinder is fixedly mounted on the support plate, and an insulator is mounted at the end of the control cylinder. The high-voltage lead is fixed at the end of the insulator away from the control cylinder, and a connecting end seat is fixedly mounted at the end of the insulator close to the control cylinder. A rubber corrugated curtain is connected between the connecting end seat and the control cylinder to enclose the control cylinder. A dual-state adjustment mechanism is provided inside the control cylinder. When the transformer start-stop frequency is higher than a set value, the dual-state adjustment mechanism allows the insulator to move radially and axially relative to the control cylinder; when the transformer start-stop frequency is lower than the set value, the dual-state adjustment mechanism allows the insulator to be fixed relative to the control cylinder.

[0005] The dual-state adjustment mechanism includes an axially movable inner cover disposed inside the control cylinder. A side wall groove is provided on the inner wall of the control cylinder. A limiting protrusion is fixedly provided on the outer surface of the axially movable inner cover. The limiting protrusion cooperates with the side wall groove to limit the movement of the axially movable inner cover, so that the axially movable inner cover can only move axially relative to the control cylinder.

[0006] The dual-state adjustment mechanism further includes a threaded cylinder fixedly installed on the connecting end seat. A limiting plate is fixedly provided on the outer surface of the threaded cylinder. A first clamping plate and a second clamping plate are fixedly provided on the inner wall surface of the axial moving inner cover. Both the first clamping plate and the second clamping plate are annular, and the inner ring diameter of the first clamping plate and the second clamping plate is larger than the diameter of the threaded cylinder. The first clamping plate and the second clamping plate clamp and limit the limiting plate between them, so that the limiting plate can only move radially.

[0007] The threaded cylinder has a threaded post installed inside in a helical fit. A locking pressure plate is fixedly installed at the end of the threaded post. A universal joint is provided on the side of the locking pressure plate away from the threaded post. The universal joint drives the locking pressure plate to rotate without affecting the movement of the locking pressure plate.

[0008] The dual-state adjustment mechanism also includes a pressure locking component; when the transformer start-stop frequency is lower than the set value, the locking pressure plate moves axially by rotating, and then clamps and locks with the second clamping plate, so that the limit plate cannot move radially; while the locking pressure plate clamps and locks with the second clamping plate, the pressure locking component locks the axial inner cover and the control cylinder relative to each other, so that the axial inner cover cannot move axially.

[0009] The pressure locking assembly includes an alignment groove formed on the second clamping plate. A detection pressure frame is provided on one side of the alignment groove. When the locking pressure plate moves axially toward the second clamping plate, it can squeeze the detection pressure frame and drive the detection pressure frame to move. When the locking pressure plate and the second clamping plate are clamped and locked, the detection pressure frame is pressed into the alignment groove.

[0010] A limiting slide is fixedly installed on the inner wall of the axially movable inner cover. A pushing component is installed in the limiting slide. The pushing component is fixed to the detection pressure frame and the detection pressure frame drives the pushing component to move.

[0011] A locking tongue is embedded in the inner wall of the axially movable inner cover, and an inner wall groove is formed on the inner wall of the control cylinder. When the pushing member moves, it can squeeze the locking tongue, causing the locking tongue to move outward of the axially movable inner cover and engage in the inner wall groove, thus locking the axially movable inner cover and the control cylinder relative to each other. The limiting slide cover has a first elastic pull tab inside and a second elastic pull tab outside. The first elastic pull tab is connected to the locking tongue and applies a pulling force to the locking tongue, causing the locking tongue to tend to move inward of the axially movable inner cover. The second elastic pull tab is connected to the detection pressure frame and applies a pulling force to the detection pressure frame, causing the detection pressure frame to tend to move away from the location of the second clamping plate.

[0012] A photosensitive sensor is embedded in the control cylinder. The photosensitive sensor is located at one end of the control cylinder near the insulator. When creepage occurs on the surface of the insulator, it can be detected by the photosensitive sensor.

[0013] The control cylinder is externally connected to a pneumatic control pipe, and the other end of the pneumatic control pipe is connected to a compressed gas cylinder. The compressed gas cylinder is equipped with an electrically controlled air valve. When the photosensitive sensor detects creepage, it controls the electrically controlled air valve to open, so that the compressed gas in the compressed gas cylinder enters the interior of the control cylinder through the pneumatic control pipe, pushing the connecting end seat and the rubber corrugated curtain to bulge outward from the control cylinder.

[0014] Compared with the prior art, the beneficial effects of the present invention are: The high-voltage lead fixing and shockproof structure of the marine transformer of this invention, through the cooperation of a dual-state adjustment mechanism and connecting end seats and other structures, can fix and support the high-voltage lead of the transformer, suppressing the vibration and resonance swing of the high-voltage lead. When the transformer starts and stops more frequently than a set value, since each start and stop is accompanied by large temperature fluctuations, the dual-state adjustment mechanism of this invention allows the insulator to move axially and radially, releasing the thermal expansion and contraction stress of the high-voltage lead. This avoids the high-voltage lead being rigidly supported and stuck under conditions of large and frequent temperature fluctuations, which can cause bending stress and fatigue cracking. It also enables flexible switching between different support states under different operating conditions.

[0015] In operation with large and frequent temperature fluctuations, when the insulator can move radially and axially relative to the control cylinder, the present invention can detect the creepage of the insulator by means of a photosensitive sensor. When creepage is detected on the surface of the insulator, a positive pressure is generated inside the control cylinder, which drives the connecting end to bulge outward axially from the control cylinder, thereby moving the insulator further away from the control cylinder and the coil, increasing the insulation gap between the high-voltage lead and the coil, and performing emergency safety control. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a side view of the overall structure of the present invention.

[0018] Figure 3 This is a three-dimensional half-sectional schematic diagram of the insulator part of the present invention.

[0019] Figure 4 This is a partial three-dimensional cross-sectional view of the insulator of the present invention.

[0020] Figure 5 This is a schematic diagram of the components at the control cylinder of the present invention.

[0021] Figure 6 This is a three-dimensional half-sectional schematic diagram of the components at the control cylinder of the present invention.

[0022] Figure 7 This is a three-dimensional half-sectional view of the control cylinder of the present invention.

[0023] Figure 8 This is a three-dimensional half-section schematic diagram of the pressure frame of the present invention.

[0024] Figure 9 This is a schematic diagram of the axially movable inner cover structure of the present invention.

[0025] In the diagram: 1. Core clamping frame; 2. Support plate; 3. Control cylinder; 4. Insulator; 5. Connecting end seat; 6. Rubber corrugated curtain; 7. Photosensitive sensor; 301. Shaft-driven inner cover; 302. Side wall slide groove; 303. Limiting protrusion; 304. Threaded cylinder; 305. Limiting plate; 306. First clamping plate; 307. Second clamping plate; 308. Threaded post; 309. Locking pressure plate; 310. Universal joint; 311. Alignment groove; 312. Detection... Pressure testing frame; 313, limiting slide cover; 314, pushing component; 315, locking tongue component; 316, inner wall slot; 317, first elastic pull tab; 318, second elastic pull tab; 701, pneumatic control pipeline; 702, compressed gas cylinder; 703, electrically controlled gas valve; 101, column support shaft; 102, transverse support shaft; 201, adjusting gear; 202, drive rack; 203, rack clamping part; 204, synchronous lifting crossbar; 205, gas cylinder fixing seat. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figures 1 to 9 This invention provides a technical solution: a high-voltage lead fixing and shockproof structure for a marine transformer, including a core clamp frame 1, as shown below. Figure 1As shown, a vertical support shaft 101 and a horizontal support shaft 102 are fixedly installed on the core clamp frame 1. The vertical support shaft 101 is vertically positioned, and the horizontal support shaft 102 is horizontally positioned. The vertical support shaft 101 and the horizontal support shaft 102 cooperate to support and fix the core clamp frame 1, allowing the core clamp frame 1 to clamp and fix the core. A bracket plate 2 is bolted to the core clamp frame 1. A control cylinder 3 is integrally formed and fixed on the bracket plate 2. An insulator 4 is located at the end of the control cylinder 3. A high-voltage lead is fixed at the end of the insulator 4 away from the control cylinder 3. A connecting end seat 5 is fixedly installed at the end of the insulator 4 closest to the control cylinder 3. A groove is formed at the end of the insulator 4. When the high-voltage lead is fixed to the end of the insulator 4 with screws, the high-voltage lead is locked in the groove, preventing the insulator 4 from rotating relative to the high-voltage lead. A rubber corrugated curtain 6 is connected between the connecting end seat 5 and the control cylinder 3, sealing the control cylinder 3. Figure 7 As shown, the rubber corrugated curtain 6 is provided so that the end of the control cylinder 3 is sealed, while not affecting the axial and radial movement of the connecting end seat 5 relative to the control cylinder 3.

[0028] The control cylinder 3 is equipped with a dual-state adjustment mechanism. When the transformer start-stop frequency is higher than the set value, the dual-state adjustment mechanism allows the insulator 4 to move radially and axially relative to the control cylinder 3; when the transformer start-stop frequency is lower than the set value, the dual-state adjustment mechanism allows the insulator 4 to be fixed relative to the control cylinder 3. The above-mentioned set value can be determined based on the transformer's high-voltage lead stress resistance design and experiments. For example, the set value is one start-stop per day, and anything exceeding this is considered to be above the set value.

[0029] like Figure 7 As shown, the dual-state adjustment mechanism includes a axially movable inner cover 301 disposed inside the control cylinder 3. A side wall groove 302 is provided on the inner wall of the control cylinder 3. A limiting protrusion 303 is fixedly provided on the outer surface of the axially movable inner cover 301. The limiting protrusion 303 cooperates with the side wall groove 302 to limit the movement of the axially movable inner cover 301, so that the axially movable inner cover 301 can only move axially relative to the control cylinder 3.

[0030] The dual-state adjustment mechanism also includes a threaded cylinder 304 fixedly installed on the connecting end seat 5. A limiting plate 305 is fixedly provided on the outer surface of the threaded cylinder 304. A first clamping plate 306 and a second clamping plate 307 are fixedly provided on the inner wall surface of the axial inner cover 301. Both the first clamping plate 306 and the second clamping plate 307 are annular, and the inner ring diameter of the first clamping plate 306 and the second clamping plate 307 is larger than the diameter of the threaded cylinder 304, so that the threaded cylinder 304 has sufficient radial movement space. The first clamping plate 306 and the second clamping plate 307 clamp and limit the limiting plate 305 between them, so that the limiting plate 305 can only move radially.

[0031] The threaded cylinder 304 has a threaded post 308 installed internally with a helical fit. A locking pressure plate 309 is fixedly installed at the end of the threaded post 308. A universal joint 310 is provided on the side of the locking pressure plate 309 away from the threaded post 308. The universal joint 310 drives the locking pressure plate 309 to rotate without affecting its movement. Figure 7 As shown, an adjusting gear 201 is provided on the outside of the support plate 2. The universal joint 310 is connected to the adjusting gear 201 for transmission. When the universal joint 310 passes through the support plate 2, the two are sealed together. Specifically, a through hole is provided on the surface of the support plate 2, and a sealing ring is embedded in the through hole. When the universal joint 310 passes through the through hole, it makes sealing contact with the sealing ring to achieve a sealed fit.

[0032] like Figure 7 As shown, the universal joint 310 is a universal joint structure in the prior art, including a telescopic intermediate shaft and universal joints located at both ends of the intermediate shaft. Rotational force is transmitted through the universal joint 310 without affecting the axial and radial movement of the locking pressure plate 309.

[0033] like Figure 4 As shown, the adjusting gear 201 is externally meshed with a drive rack 202, such as... Figure 5 As shown, a rack clamping part 203 is fixedly provided on the surface of the bracket plate 2. The drive rack 202 is limited by the rack clamping part 203. The lifting and lowering movement of the drive rack 202 drives the adjustment gear 201 to rotate, so that the adjustment gear 201 can drive the universal joint 310 to rotate.

[0034] like Figure 1 and Figure 4 As shown, a synchronous lifting crossbar 204 is fixedly installed at the end of the drive rack 202. The synchronous lifting crossbar 204 drives the drive rack 202 to move up and down, so that the drive racks 202 corresponding to the three-phase high-voltage leads move up and down synchronously. The synchronous lifting crossbar 204 is driven to move up and down by a motor in conjunction with a lead screw mechanism.

[0035] The dual-state adjustment mechanism also includes a pressure locking component. When the transformer start-stop frequency is lower than the set value, the locking pressure plate 309 rotates to move axially, thereby clamping and locking with the second clamping plate 307, preventing the limiting plate 305 from moving radially. Both the surface of the locking pressure plate 309 and the surface of the second clamping plate 307 are provided with engagement protrusions, which are not shown in the accompanying drawings. When the locking pressure plate 309 and the second clamping plate 307 are clamped and locked, the engagement protrusions limit each other, making the locking pressure plate 309 and the second clamping plate 307 more stable and preventing slippage. At the same time as the locking pressure plate 309 and the second clamping plate 307 are clamped and locked, the pressure locking component locks the axial inner cover 301 and the control cylinder 3 relative to each other, preventing the axial inner cover 301 from moving axially.

[0036] The pressure locking assembly includes an alignment groove 311 formed on the second clamping plate 307. A detection pressure frame 312 is provided on one side of the alignment groove 311. When the locking pressure plate 309 moves axially toward the second clamping plate 307, it can squeeze the detection pressure frame 312 and drive the detection pressure frame 312 to move. When the locking pressure plate 309 and the second clamping plate 307 are clamped and locked, the detection pressure frame 312 is pressed into the alignment groove 311.

[0037] A limiting slide cover 313 is fixedly installed on the inner wall of the axially movable inner cover 301. A pushing member 314 is provided in the limiting slide cover 313. The pushing member 314 is fixed to the detection pressure frame 312, and the detection pressure frame 312 drives the pushing member 314 to move. A locking tongue 315 is embedded in the inner wall of the axially movable inner cover 301. An inner wall groove 316 is opened on the inner wall of the control cylinder 3. When the pushing member 314 moves, it can squeeze the locking tongue 315, so that the locking tongue 315 moves towards the outside of the axially movable inner cover 301 and is locked into the inner wall groove 316, locking the axially movable inner cover 301 and the control cylinder 3 relative to each other.

[0038] The limiting slide cover 313 has a first elastic pull tab 317 inside and a second elastic pull tab 318 outside. The first elastic pull tab 317 is connected to the locking tongue 315 and applies a pulling force to the locking tongue 315, causing the locking tongue 315 to tend to move towards the inside of the axially movable inner cover 301. The second elastic pull tab 318 is connected to the detection pressure frame 312 and applies a pulling force to the detection pressure frame 312, causing the detection pressure frame 312 to tend to move away from the location of the second clamping plate 307.

[0039] A photosensitive sensor 7 is embedded in the control cylinder 3, located at one end of the control cylinder 3 near the insulator 4. When creepage occurs on the surface of the insulator 4, the photosensitive sensor 7 can detect it. An external pneumatic control pipe 701 is connected to the control cylinder 3, and the other end of the pneumatic control pipe 701 is connected to a compressed air cylinder 702, which is filled with compressed gas. Figure 5 As shown, a gas cylinder mounting base 205 is fixedly installed on the surface of the support plate 2, and the compressed gas cylinder 702 is fixed to the support plate 2 through the gas cylinder mounting base 205. An electrically controlled air valve 703 is installed on the compressed gas cylinder 702; when the photosensitive sensor 7 detects creepage, it controls the electrically controlled air valve 703 to open, allowing the compressed gas in the compressed gas cylinder 702 to enter the interior of the control cylinder 3 through the air control pipe 701. The intermediate shaft of the universal joint 310 is telescopic; therefore, when the pressure inside the control cylinder 3 increases, pushing the connecting end seat 5 and the rubber corrugated curtain 6 to bulge axially outwards from the control cylinder 3, the telescopic function of the universal joint 310 will not hinder the movement and displacement of the connecting end seat 5.

[0040] This invention addresses situations where the transformer's start-up and shutdown frequency exceeds a set value, and where there are large and frequent temperature fluctuations. Figure 7 As shown, the locking pressure plate 309 is moved away from the second clamping plate 307. At this time, the insulator 4 and the connecting end seat 5 can move radially relative to the axial inner cover 301, while the axial inner cover 301 can move axially relative to the control cylinder 3. This makes the insulator 4 no longer rigidly fix the high voltage lead, avoiding problems such as bending stress and fatigue cracking caused by thermal expansion and contraction of the high voltage lead.

[0041] However, when the transformer's start-up and shutdown frequency is lower than the set value, or when the transformer's temperature is stable during handling and transportation, and rigid support is required for the high-voltage leads, such as... Figure 4 and Figure 7 As shown, the control synchronous lifting crossbar 204 moves downward, causing the drive rack 202 to move downward, which in turn drives the adjusting gear 201 to rotate.

[0042] The adjusting gear 201 drives the locking pressure plate 309 to rotate via the universal joint 310. The locking pressure plate 309 drives the threaded column 308 to rotate. The insulator 4 and the connecting end seat 5 are limited by the rotation of the rubber corrugated curtain 6 and the vertical limit of the high voltage lead, so that the insulator 4 and the connecting end seat 5 will not rotate. At this time, the threaded column 308 and the threaded cylinder 304 rotate relative to each other. The threaded column 308 moves toward the inside of the threaded cylinder 304, and the locking pressure plate 309 moves axially toward the second clamp 307.

[0043] like Figure 8 As shown, during the process of the locking pressure plate 309 moving towards the second clamping plate 307, the locking pressure plate 309 squeezes the detection pressure frame 312, pushing the detection pressure frame 312 and the pusher 314 and other structures to the left. The pusher 314 squeezes the locking tongue 315, causing the locking tongue 315 to protrude outward and move. The locking tongue 315 is inserted into the inner wall groove 316, locking the axial inner cover 301 and the control cylinder 3 relative to each other. At this time, the axial inner cover 301 cannot move axially relative to the control cylinder 3.

[0044] As the locking pressure plate 309 and the second clamping plate 307 come into contact, the locking pressure plate 309 clamps and locks with the second clamping plate 307 through friction. Figure 7 As shown, the limiting plate 305 and the locking plate 309 cooperate to clamp and lock the second clamping plate 307. At this time, the insulator 4 and the connecting end seat 5 and other structures cannot move radially relative to the axial inner cover 301; the entire insulator 4 is completely rigidly locked relative to the control cylinder 3, providing rigid support for the high-voltage lead during transportation and handling or under stable temperature conditions.

[0045] This invention addresses situations where the transformer's start-up and shutdown frequency exceeds a set value, or where there are large and frequent temperature fluctuations. Figure 7 As shown, the locking pressure plate 309 is moved away from the second clamping plate 307. At this time, the insulator 4 and the connecting end seat 5 can move radially relative to the axially movable inner cover 301, while the axially movable inner cover 301 can move axially relative to the control cylinder 3. The high-voltage lead is no longer rigidly fixed, avoiding problems such as bending stress and fatigue cracking caused by thermal expansion and contraction. In this embodiment of the invention, frequent transformer start-up and shutdown are taken as a typical scenario, but other operating conditions with large and frequent temperature fluctuations can also be considered. Among these, the temperature impact caused by frequent transformer start-up and shutdown is the most significant, causing the temperature difference between room temperature and operating temperature to fluctuate much more than during normal operation.

[0046] Because creepage produces a blue-violet halo, which is clearly visible in the dark environment inside the transformer, the photosensitive sensor 7 of this invention uses a visible light optical fiber sensor to directly capture the creepage arc light. When the photosensitive sensor 7 detects the creepage arc light, it controls the opening of the electrically controlled pneumatic valve 703. Figure 6 As shown, when the electronically controlled air valve 703 is opened, the compressed gas in the compressed gas cylinder 702 enters the interior of the control cylinder 3 directly through the air control pipe 701.

[0047] like Figure 7 As shown, the control cylinder 3 is under high pressure, which pushes the connecting end seat 5 and the rubber corrugated curtain 6 outwards. This causes the connecting end seat 5 to move axially to the left, which in turn moves the insulator 4 to the left. The insulator 4 supports the high-voltage lead and moves a short distance away from the coil winding, increasing the insulation gap between the high-voltage lead and the coil winding, improving safety, and sending a signal to the fault warning terminal. During maintenance, the operator cleans the surface of the insulator 4, releases the gas from the control cylinder 3, and refills the compressed gas cylinder 702.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-voltage lead fixing and shockproof structure for a marine transformer, comprising a core clamp frame (1) and a support plate (2) fixedly mounted on the core clamp frame (1), characterized in that: A control cylinder (3) is fixedly installed on the support plate (2). An insulator (4) is installed at the end of the control cylinder (3). A high-voltage lead is fixed at the end of the insulator (4) away from the control cylinder (3). A connecting end seat (5) is fixedly installed at the end of the insulator (4) close to the control cylinder (3). A rubber corrugated curtain (6) is connected between the connecting end seat (5) and the control cylinder (3) to seal the control cylinder (3). The control cylinder (3) is equipped with a dual-state adjustment mechanism. When the transformer start-up and shutdown frequency is higher than the set value, the dual-state adjustment mechanism enables the insulator (4) to move radially and axially relative to the control cylinder (3); when the transformer start-up and shutdown frequency is lower than the set value, the dual-state adjustment mechanism enables the insulator (4) to be fixed relative to the control cylinder (3). The dual-state adjustment mechanism includes a axially movable inner cover (301) disposed inside the control cylinder (3). A side wall groove (302) is provided on the inner wall of the control cylinder (3). A limiting protrusion (303) is fixedly provided on the outer surface of the axially movable inner cover (301). The limiting protrusion (303) is limited to the axially movable inner cover (301) by limiting the movement of the axially movable inner cover (301) relative to the control cylinder (3) through the limiting cooperation with the side wall groove (302). The dual-state adjustment mechanism also includes a threaded cylinder (304) fixedly installed on the connecting end seat (5). A limiting plate (305) is fixedly provided on the outer surface of the threaded cylinder (304). A first clamping plate (306) and a second clamping plate (307) are fixedly provided on the inner wall surface of the axially movable inner cover (301). The first clamping plate (306) and the second clamping plate (307) are both annular, and the inner ring diameter of the first clamping plate (306) and the second clamping plate (307) is larger than the diameter of the threaded cylinder (304). The first clamping plate (306) and the second clamping plate (307) clamp and limit the limiting plate (305) between them, so that the limiting plate (305) can only move radially.

2. The high-voltage lead fixing and shockproof structure for marine transformers according to claim 1, characterized in that: The threaded cylinder (304) is internally helically fitted with a threaded column (308), and a locking pressure plate (309) is fixedly provided at the end of the threaded column (308). A universal joint (310) is provided on the side of the locking pressure plate (309) away from the threaded column (308). The universal joint (310) drives the locking pressure plate (309) to rotate without affecting the movement of the locking pressure plate (309).

3. The high-voltage lead fixing and shockproof structure for marine transformers according to claim 2, characterized in that: The dual-state adjustment mechanism also includes a pressure locking component; when the transformer start-stop frequency is lower than the set value, the locking pressure plate (309) moves axially by rotation, and then clamps and locks with the second clamping plate (307), so that the limit plate (305) cannot move radially; while the locking pressure plate (309) clamps and locks with the second clamping plate (307), the pressure locking component locks the axial moving inner cover (301) and the control cylinder (3) relative to each other, so that the axial moving inner cover (301) cannot move axially.

4. The high-voltage lead fixing and shockproof structure for marine transformers according to claim 3, characterized in that: The pressure locking assembly includes an alignment groove (311) formed on the second clamping plate (307). A detection pressure frame (312) is provided on one side of the alignment groove (311). When the locking pressure plate (309) moves axially toward the second clamping plate (307), it can squeeze the detection pressure frame (312) and drive the detection pressure frame (312) to move. When the locking pressure plate (309) and the second clamping plate (307) are clamped and locked, the detection pressure frame (312) is pressed into the alignment groove (311).

5. The high-voltage lead fixing and shockproof structure for marine transformers according to claim 4, characterized in that: A limiting slide cover (313) is fixedly installed on the inner wall of the axially movable inner cover (301). A pushing member (314) is provided in the limiting slide cover (313). The pushing member (314) is fixed to the detection pressure frame (312). The pushing member (314) is moved by the detection pressure frame (312).

6. The high-voltage lead fixing and shockproof structure for marine transformers according to claim 5, characterized in that: A locking tongue (315) is embedded in the inner wall of the axial inner cover (301), and an inner wall groove (316) is provided on the inner wall of the control cylinder (3). When the pusher (314) moves, it can squeeze the locking tongue (315), so that the locking tongue (315) moves towards the outside of the axial inner cover (301) and is inserted into the inner wall groove (316), thereby locking the axial inner cover (301) and the control cylinder (3) relative to each other. The limiting slide cover (313) is provided with a first elastic pull tab (317) inside and a second elastic pull tab (318) outside. The first elastic pull tab (317) is connected to the locking tongue (315) and applies a pulling force to the locking tongue (315), so that the locking tongue (315) tends to move towards the inside of the axial inner cover (301). The second elastic pull tab (318) is connected to the detection pressure frame (312) and applies a pulling force to the detection pressure frame (312), so that the detection pressure frame (312) tends to move away from the location of the second clamp (307).

7. The high-voltage lead fixing and shockproof structure for marine transformers according to claim 1, characterized in that: A photosensitive sensor (7) is embedded in the control cylinder (3). The photosensitive sensor (7) is located at one end of the control cylinder (3) near the insulator (4). When creepage occurs on the surface of the insulator (4), it can be detected by the photosensitive sensor (7).

8. The high-voltage lead fixing and shockproof structure for marine transformers according to claim 7, characterized in that: The control cylinder (3) is externally connected to a pneumatic control pipe (701), and the other end of the pneumatic control pipe (701) is connected to a compressed gas cylinder (702). The compressed gas cylinder (702) is equipped with an electric control valve (703). When the photosensitive sensor (7) detects creepage, it controls the electric control valve (703) to open, so that the compressed gas in the compressed gas cylinder (702) enters the interior of the control cylinder (3) through the pneumatic control pipe (701), pushing the connecting end seat (5) and the rubber corrugated curtain (6) to bulge outward from the control cylinder (3).

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