Underwater electric winch sealing device

Abstract

The invention relates to an underwater electric winch sealing device, and belongs to the technical field of underwater winding and unwinding equipment. The underwater electric winch sealing device comprises a dynamic sealing device, the dynamic sealing device comprises an outer ring and an inner ring, the inner ring is arranged on the inner side of the outer ring, and a sliding frame and two end covers are connected between the outer ring and the inner ring in a sliding mode; according to the underwater electric winch sealing device, the self-adaptive pressure adjusting device can actively adjust the pressure of the hydraulic oil between the outer ring and the inner ring so as to meet the requirement that the dynamic sealing device can normally operate at the corresponding water depth, meanwhile, in the submerging process of the underwater electric winch, water pressure can also act on the hydraulic oil, and when the water pressure is larger than the pressure of the hydraulic oil, the dynamic sealing device can normally operate. At the moment, the hydraulic pressure of the hydraulic oil can be kept consistent with the external water pressure, and the probability that the hydraulic oil and water are blended due to the fact that the pressure difference between the hydraulic pressure of the hydraulic oil and the nearby water pressure is too large is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of underwater retractable equipment, and in particular to an underwater electric winch sealing device. Background Art

[0002] An underwater winch is an unmanned power device used on underwater observation platforms. It is generally composed of a mounting frame, a drive device, a transmission mechanism, a guide rope device, a cable, a moored communication cable and an underwater electric slip ring. It is driven by a built-in motor to achieve the retraction and release of ropes or cables.

[0003] A Chinese patent discloses an underwater winch with a motor-built-in oil-filled mechanical seal (authorization announcement number CN213568855U). A compensating oil pipe is installed at the fixed end of the motor's sealed cabin, and transformer oil is filled inside the motor's sealed cabin. The compensating oil pipe maintains the pressure balance between the cabin and the outside. A mechanical seal is installed on the sealed output shaft. When the seal is worn, it is automatically compensated under the dual action of the compensating oil pipe and the mechanical seal to ensure the reliability of the seal.

[0004] Since the above device can only compensate for the pressure inside the mechanical seal when the mechanical seal is worn, the water pressure at different depths in the water will also cause the internal and external pressures of the mechanical seal to change, and the above device cannot automatically adjust the pressure of the mechanical seal under the above circumstances, which will increase the operating burden of the mechanical seal and shorten the service life of the mechanical seal itself. Summary of the invention

[0005] Based on this, it is necessary to provide an underwater electric winch sealing device to address the problem that the underwater electric winch sealing device is easily affected by water pressure and rotating centrifugal force, making it difficult to ensure its effective operation.

[0006] A sealing device for an underwater electric winch comprises a dynamic sealing device, wherein the dynamic sealing device comprises an outer ring and an inner ring, wherein the inner ring is arranged on the inner side of the outer ring, wherein a sliding frame and two end covers are slidably connected between the outer ring and the inner ring, wherein the two end covers are symmetrically distributed on both sides of the two sliding frames, wherein the sliding frames are rotatably connected to a rotating shaft which is distributed in an annular shape and contacts the outer ring and the inner ring, wherein O-rings are arranged between the outer ring, the inner ring and the end covers, and wherein the bottom of the outer ring is fixedly connected and communicated with an adaptive pressure regulating device.

[0007] Furthermore, the adaptive pressure regulating device includes a liquid guide tube, a piston cylinder, a piston block and an adjusting bolt. The liquid guide tube is fixedly connected and communicated with the bottom of the outer ring, the piston cylinder is fixedly connected and communicated with the bottom of the liquid guide tube, the piston block is slidably connected to the inside of the piston cylinder, the space between the outer ring and the inner ring, the inside of the liquid guide tube and the piston cylinder are all filled with hydraulic oil, the adjusting bolt is threadedly connected to the bottom of the piston cylinder, the top of the adjusting bolt penetrates into the inside of the piston cylinder and contacts with the piston block, and a water guide hole is opened at the bottom of the piston cylinder.

[0008] In one of the embodiments, the adaptive pressure regulating device can not only actively adjust the pressure of the hydraulic oil between the outer ring and the inner ring to ensure that the dynamic sealing device can operate normally at the corresponding water depth, but also the water pressure can act on the hydraulic oil during the diving of the underwater electric winch. When the water pressure is greater than the pressure of the hydraulic oil, the water pressure can indirectly squeeze the hydraulic oil. At this time, the liquid pressure of the hydraulic oil can be consistent with the external water pressure, effectively reducing the probability of hydraulic oil and water mixing due to excessive pressure difference between the liquid pressure of the hydraulic oil and the nearby water pressure, thereby ensuring the stable operation of the dynamic sealing device.

[0009] Furthermore, a sliding cavity is provided at the top of the adjusting bolt, an adjusting column is slidably connected inside the sliding cavity, and the top of the adjusting column passes through the sliding cavity and is fixedly connected to the piston block.

[0010] In one embodiment, this can limit the trajectory and range of the piston block to ensure that the piston block can operate normally.

[0011] Furthermore, the vertical cross-section of the sliding cavity and the adjusting column is convex, and the local cross-section size of the adjusting column arranged inside the sliding cavity is larger than the local cross-section size of the adjusting column arranged outside the sliding cavity.

[0012] In one embodiment, this can prevent the adjusting column from slipping out of the sliding cavity, so as to ensure that the adjusting bolt can stably drive the adjusting column.

[0013] Furthermore, an elastic liquid sac is fixedly connected to the inner top wall of the piston cylinder, the bottom of the liquid guide tube is fixedly connected and communicated with the bottom of the elastic liquid sac, and the top of the piston block is in contact with the elastic liquid sac.

[0014] In one embodiment, the elastic liquid bag can reduce the probability of hydraulic oil leaking from the gap between the piston block and the piston cylinder, which can not only ensure the hydraulic pressure of the hydraulic oil, but also reduce the probability of hydraulic oil polluting the water body.

[0015] Furthermore, the top of the elastic liquid bag is fixedly connected to and communicated with a hydraulic quick connector fixedly connected to the piston cylinder, and the top of the hydraulic quick connector penetrates to the outside of the piston cylinder.

[0016] In one embodiment, this enables the staff to quickly extract or fill the hydraulic oil, making the maintenance work more convenient for the staff.

[0017] Furthermore, a protective mechanism is fixedly connected to the interior of the elastic liquid sac, and the protective mechanism includes a mounting block and a filter plate. The mounting block is fixedly connected to the inner top wall of the elastic liquid sac, and a first liquid guide cavity and a second liquid guide cavity that are interconnected are provided on the top of the mounting block. The bottoms of the liquid guide tube and the oil pressure quick connector are respectively connected to the first liquid guide cavity and the second liquid guide cavity, and a liquid guide port that is connected to the second liquid guide cavity is provided at the bottom of the mounting block. The filter plate is rotatably connected to the interior of the second liquid guide cavity, and one end of the filter plate is in contact with the lower opening of the first liquid guide cavity. The diameter of the second liquid guide cavity and the inner diameter of the filter plate are both larger than the inner diameter of the first liquid guide cavity.

[0018] In one of the embodiments, the protection mechanism can collect the solid debris that sinks along with the hydraulic oil to reduce the resistance of the inner ring and the rotating shaft during rotation, effectively reducing the rate of wear. When the staff pours hydraulic oil inward, the hydraulic oil flowing inward can abut the filter plate and cover the lower opening of the first liquid guide cavity, which can not only prevent the solid debris remaining in the second liquid guide cavity from flowing back, but also prevent the solid debris in the hydraulic oil flowing inward from entering between the outer ring and the inner ring, which further reduces the resistance of the inner ring and the rotating shaft during rotation, thereby extending the overall service life of the dynamic sealing device.

[0019] Furthermore, the filter plate is in a vertical state at this time, and the diameter of the filter plate is smaller than the inner diameter of the second liquid guiding cavity.

[0020] In one embodiment, this can ensure that the filter plate can rotate normally in the second liquid guiding cavity, so as to ensure that the solid debris can be discharged normally.

[0021] Furthermore, a first filter screen is embedded and installed inside the liquid guide port, and the distance between filter plates of the first filter screen is greater than the diameter of the filter plates.

[0022] In one embodiment, this can prevent the probability of solid debris entering the elastic liquid sac, which not only reduces the difficulty of discharging the solid debris, but also reduces the probability of the solid debris scratching the elastic liquid sac, thereby ensuring the integrity of the elastic liquid sac.

[0023] Furthermore, the cross-sectional shape of the bottom of the mounting block is arc-shaped, and the corners of the mounting block are rounded.

[0024] In one embodiment, this can reduce the probability of the elastic sac being scratched by the mounting block, further ensuring the integrity of the elastic sac.

[0025] Furthermore, a second filter screen is embedded in the water guide hole, and the bottom of the second filter screen is flush with the lower opening of the water guide hole.

[0026] In one embodiment, the second filter screen can filter out solid impurities mixed in the passing water to prevent the solid impurities from entering the interior of the piston cylinder, thereby ensuring that the piston block and the adjusting bolt can operate normally.

[0027] The above-mentioned underwater electric winch sealing device, the adaptive pressure regulating device can not only actively adjust the pressure of the hydraulic oil between the outer ring and the inner ring to ensure that the dynamic sealing device can operate normally at the corresponding water depth, but also the water pressure can act on the hydraulic oil during the diving of the underwater electric winch. When the water pressure is greater than the pressure of the hydraulic oil, the water pressure can indirectly squeeze the hydraulic oil. At this time, the hydraulic pressure of the hydraulic oil can be consistent with the external water pressure, which effectively reduces the probability of the hydraulic oil and water mixing due to the excessive pressure difference between the hydraulic pressure of the hydraulic oil and the nearby water pressure, thereby ensuring the stable operation of the dynamic sealing device;

[0028] The protective mechanism can collect the solid debris that sinks along the hydraulic oil to reduce the resistance of the inner ring and the rotating shaft during rotation, effectively reduce the wear rate, and further ensure the stable operation of the dynamic sealing device. When the staff pours hydraulic oil inward, the hydraulic oil flowing inward can abut the filter plate and cover the lower opening of the first liquid guide cavity, which can not only prevent the solid debris remaining in the second liquid guide cavity from flowing back, but also prevent the solid debris in the hydraulic oil flowing inward from entering between the outer ring and the inner ring, which further reduces the resistance of the inner ring and the rotating shaft during rotation, thereby extending the overall service life of the dynamic sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a schematic diagram of the connection between the dynamic sealing device and the adaptive pressure regulating device in the present invention;

[0031] Figure 2 It is a schematic diagram of the arrangement of the dynamic sealing device and the adaptive pressure regulating device in the present invention;

[0032] Figure 3 It is a cross-sectional schematic diagram of the arrangement of the dynamic sealing device and the adaptive pressure regulating device in the present invention;

[0033] Figure 4 It is a schematic diagram of the explosion of the dynamic sealing device in the present invention;

[0034] Figure 5 for Figure 1Schematic cross-sectional view along the AA direction;

[0035] Figure 6 for Figure 1 A cross-sectional schematic diagram along the BB direction;

[0036] Figure 7 for Figure 6 Enlarged view of middle C;

[0037] Figure 8 It is a schematic diagram of the explosion of the protection mechanism in the present invention.

[0038] Reference numerals:

[0039] 100, dynamic sealing device; 110, outer ring; 120, inner ring; 130, sliding frame; 140, end cover; 150, rotating shaft; 160, O-ring; 200, adaptive pressure regulating device; 210, liquid guide tube; 220, piston cylinder; 221, water guide hole; 230, piston block; 240, adjusting bolt; 241, sliding cavity; 250, adjusting column; 260, elastic liquid sac; 270, hydraulic quick connector; 280, protective mechanism; 281, mounting block; 2811, first liquid guide cavity; 2812, second liquid guide cavity; 2813, liquid guide port; 282, filter plate; 283, first filter screen; 290, second filter screen. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0041] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of the present invention are for illustrative purposes only and do not represent the only implementation method.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] Unless otherwise defined, all technical and scientific terms used in the specification of the present invention have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in the specification of the present invention includes any and all combinations of one or more related listed items.

[0045] Combine the following Figure 1 - Figure 8 The underwater electric winch sealing device of the present invention is described.

[0046] In one embodiment, an underwater electric winch sealing device includes a dynamic sealing device 100, the dynamic sealing device 100 includes an outer ring 110 and an inner ring 120, the inner ring 120 is arranged on the inner side of the outer ring 110, a sliding frame 130 and two end covers 140 are slidably connected between the outer ring 110 and the inner ring 120, the two end covers 140 are symmetrically distributed on both sides of the two sliding frames 130, the sliding frames 130 are rotatably connected with a rotating shaft 150 that is distributed in an annular shape and contacts the outer ring 110 and the inner ring 120, O-rings 160 are arranged between the outer ring 110 and the inner ring 120 and the end covers 140, and the bottom of the outer ring 110 is fixedly connected and connected with an adaptive pressure regulating device 200;

[0047] The underwater electric winch includes a frame and two dynamic sealing devices 100, wherein the outer rings 110 of the two dynamic sealing devices 100 are respectively fixedly connected to the two ends of the frame, a drum is fixedly connected between the two inner rings 120, a cable is wound on the surface of the drum, a reduction motor is fixedly connected inside the drum, the end of the reduction motor output shaft passes through the drum frame and is fixedly connected, and the signal transmission part of the reduction motor is electrically connected to the external energy supply and control equipment through a water-sealed connector;

[0048] It should be noted that the energy supply device mentioned above can be a power supply, which is a device that converts other forms of energy into electrical energy and provides electrical energy to the circuit. The control device can be a PLC controller, which is a digital operation controller with a microprocessor for automatic control, and can load control instructions into the memory at any time for storage and execution. In the above description, the oil pressure quick connector 270, the water sealing connector, the reduction motor, the power supply and the PLC controller are all devices with relatively mature application in the prior art. The specific model can be selected according to actual needs and will not be described in detail here.

[0049] When the staff needs to unwind the cable, they only need to manually control the reduction motor to drive in the corresponding direction through the PLC controller. The reduction motor drives the drum to rotate in the corresponding direction. The drum then reels or releases the cable normally.

[0050] like Figure 5 , Figure 6 and Figure 7As shown, the adaptive pressure regulating device 200 includes a liquid guide tube 210, a piston cylinder 220, a piston block 230 and an adjusting bolt 240. The liquid guide tube 210 is fixedly connected and communicated with the bottom of the outer ring 110, the piston cylinder 220 is fixedly connected and communicated with the bottom of the liquid guide tube 210, the piston block 230 is slidably connected to the inside of the piston cylinder 220, the outer ring 110 and the inner ring 120, the inside of the liquid guide tube 210 and the piston cylinder 220 are filled with hydraulic oil, the adjusting bolt 240 is threadedly connected to the bottom of the piston cylinder 220, the top of the adjusting bolt 240 penetrates into the inside of the piston cylinder 220 and contacts the piston block 230, and the bottom of the piston cylinder 220 is provided with a water guide hole 221; the top of the adjusting bolt 240 is provided with a sliding cavity 241, the inside of the sliding cavity 241 is slidably connected with an adjusting column 250, and the top of the adjusting column 250 penetrates The sliding cavity 241 is fixedly connected to the piston block 230; the vertical cross-section of the sliding cavity 241 and the adjusting column 250 is convex, and the local cross-section size of the adjusting column 250 arranged inside the sliding cavity 241 is larger than the local cross-section size of the adjusting column 250 arranged outside the sliding cavity 241; the inner top wall of the piston cylinder 220 is fixedly connected with an elastic liquid capsule 260, the bottom of the liquid guide tube 210 is fixedly connected and communicated with the bottom of the elastic liquid capsule 260, and the top of the piston block 230 is in contact with the elastic liquid capsule 260; the top of the elastic liquid capsule 260 is fixedly connected and communicated with the oil pressure quick connector 270 fixedly connected to the piston cylinder 220, and the top of the oil pressure quick connector 270 passes through the outside of the piston cylinder 220; the second filter screen 290 is embedded and installed inside the water guide hole 221, and the bottom of the second filter screen 290 is flush with the lower opening of the water guide hole 221;

[0051] The staff can rotate the adjusting bolt 240 in the corresponding direction according to the requirement of the water depth, and the adjusting bolt 240 spirally rises and falls. At this time, the rod of the adjusting bolt 240 pushes upward or downward to disengage from the piston block 230, and the piston block 230 rises and falls along the piston cylinder 220. In this process, the piston block 230 also gradually increases or decreases the squeezing force on the elastic liquid bag 260, and the hydraulic pressure on the hydraulic oil increases or decreases accordingly, so as to ensure that when the dynamic sealing device 100 operates in the area of ​​corresponding water depth, the hydraulic pressure of the hydraulic oil between the outer ring 110 and the inner ring 120 and the nearby water pressure are kept within a relatively balanced range, so as to reduce the probability of the hydraulic oil and water mixing due to the excessive pressure difference between the hydraulic oil and the nearby water pressure, thereby ensuring that the dynamic sealing device 100 can operate stably;

[0052] When the piston cylinder 220 enters the water, the water enters the interior of the piston cylinder 220 through the water guide hole 221 and fills the bottom of the piston block 230. When the piston cylinder 220 dives, the water pressure inside the piston cylinder 220 is also kept the same as the surrounding water pressure. The water pressure inside the piston cylinder 220 also acts on the hydraulic oil through the piston block 230 and the elastic liquid capsule 260. When the water pressure is greater than the hydraulic pressure of the hydraulic oil, the water pressure can squeeze the hydraulic oil through the piston block 230 and the elastic liquid capsule 260, which will increase the pressure of the hydraulic oil between the outer ring 110 and the inner ring 120, so that the outer ring 110 and the inner ring 120 are always kept in a balanced state with the surrounding water pressure. This does not require the staff to actively adjust the pressure, further ensuring that the dynamic sealing device 100 can operate stably as a whole.

[0053] like Figure 7 and Figure 8 As shown, the elastic liquid capsule 260 is fixedly connected to the interior of the protective mechanism 280, and the protective mechanism 280 includes a mounting block 281 and a filter 282. The mounting block 281 is fixedly connected to the inner top wall of the elastic liquid capsule 260, and the top of the mounting block 281 is provided with a first liquid guide cavity 2811 and a second liquid guide cavity 2812 that are interconnected. The bottoms of the liquid guide tube 210 and the oil pressure quick connector 270 are respectively connected to the first liquid guide cavity 2811 and the second liquid guide cavity 2812, and the bottom of the mounting block 281 is provided with a liquid guide port 2813 that is connected to the second liquid guide cavity 2812. The filter 282 is rotatably connected to the second liquid guide cavity 2812. Inside the liquid guiding cavity 2812, one end of the filter plate 282 contacts the lower opening of the first liquid guiding cavity 2811, and the diameter of the second liquid guiding cavity 2812 and the inner diameter of the filter plate 282 are both larger than the inner diameter of the first liquid guiding cavity 2811; the filter plate 282 is in a vertical state at this time, and the diameter of the filter plate 282 is smaller than the inner diameter of the second liquid guiding cavity 2812; the first filter screen 283 is embedded and installed inside the liquid guiding port 2813, and the distance between the first filter screen 283 and the filter plate 282 is larger than the diameter of the filter plate 282; the cross-sectional shape of the bottom of the mounting block 281 is an arc shape, and the corners of the mounting block 281 are rounded.

[0054] When the staff extracts the hydraulic oil through the hydraulic quick connector 270, the hydraulic oil flowing outward can drive the filter plate 282 to rotate, so that the filter plate 282 is no longer blocked on the first liquid guide cavity 2811, so that the hydraulic oil can carry the solid debris generated during the operation and be discharged through the hydraulic quick connector 270;

[0055] When the staff stops pumping hydraulic oil outward, the filter plate 282 rotates under the action of gravity and contacts the lower opening of the first liquid guiding chamber 2811. When the staff injects hydraulic oil through the oil pressure quick connector 270, the hydraulic oil flowing inward can tightly abut the filter plate 282 and cover the lower opening of the first liquid guiding chamber 2811. This can not only prevent the solid debris remaining in the second liquid guiding chamber 2812 from flowing back, but also prevent the solid debris in the hydraulic oil flowing inward from entering between the outer ring 110 and the inner ring 120. This can reduce the resistance of the inner ring 120 and the rotating shaft 150 during rotation, effectively reduce the wear rate, and thus extend the overall service life of the dynamic sealing device 100.

[0056] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. An underwater electric winch sealing device, comprising a dynamic sealing device (100), wherein the dynamic sealing device (100) comprises an outer ring (110) and an inner ring (120), wherein the inner ring (120) is arranged on the inner side of the outer ring (110), wherein a sliding frame (130) and two end covers (140) are slidably connected between the outer ring (110) and the inner ring (120), wherein the two end covers (140) are symmetrically distributed on both sides of the two sliding frames (130), wherein the sliding frames (130) are rotatably connected with a rotating shaft (150) which is distributed in an annular shape and contacts the outer ring (110) and the inner ring (120), and an O-ring (160) is arranged between the outer ring (110) and the inner ring (120) and the end covers (140), wherein: The bottom of the outer ring (110) is fixedly connected to and communicates with an adaptive pressure regulating device (200); The adaptive pressure regulating device (200) comprises a liquid guide tube (210), a piston cylinder (220), a piston block (230) and an adjusting bolt (240); the liquid guide tube (210) is fixedly connected to and communicated with the bottom of the outer ring (110); the piston cylinder (220) is fixedly connected to and communicated with the bottom of the liquid guide tube (210); the piston block (230) is slidably connected to the inside of the piston cylinder (220); the outer ring (110) and the inner ring (120) and the inside of the liquid guide tube (210) and the piston cylinder (220) are all filled with hydraulic oil; the adjusting bolt (240) is threadedly connected to the bottom of the piston cylinder (220); the top of the adjusting bolt (240) penetrates into the inside of the piston cylinder (220) and contacts with the piston block (230); and a water guide hole (221) is provided at the bottom of the piston cylinder (220).

2. The underwater electric winch sealing device according to claim 1, characterized in that: The top of the adjusting bolt (240) is provided with a sliding cavity (241), the interior of the sliding cavity (241) is slidably connected with an adjusting column (250), and the top of the adjusting column (250) passes through the sliding cavity (241) and is fixedly connected to the piston block (230).

3. The underwater electric winch sealing device according to claim 2, characterized in that: The vertical cross-section of the sliding cavity (241) and the adjusting column (250) is convex, and the local cross-section size of the adjusting column (250) disposed inside the sliding cavity (241) is larger than the local cross-section size of the adjusting column (250) disposed outside the sliding cavity (241).

4. The underwater electric winch sealing device according to claim 1, characterized in that: The inner top wall of the piston cylinder (220) is fixedly connected with an elastic liquid sac (260), the bottom of the liquid guide tube (210) is fixedly connected and communicated with the bottom of the elastic liquid sac (260), and the top of the piston block (230) is in contact with the elastic liquid sac (260).

5. The underwater electric winch sealing device according to claim 4, characterized in that: The top of the elastic liquid bag (260) is fixedly connected to and communicates with a hydraulic quick connector (270) that is fixedly connected to the piston cylinder (220), and the top of the hydraulic quick connector (270) penetrates to the outside of the piston cylinder (220).

6. The underwater electric winch sealing device according to claim 5, characterized in that: The elastic liquid sac (260) is fixedly connected to a protective mechanism (280) inside, and the protective mechanism (280) comprises a mounting block (281) and a filter sheet (282). The mounting block (281) is fixedly connected to the inner top wall of the elastic liquid sac (260). The top of the mounting block (281) is provided with a first liquid guide cavity (2811) and a second liquid guide cavity (2812) that are interconnected. The bottoms of the liquid guide tube (210) and the oil pressure quick connector (270) are respectively connected to the first liquid guide cavity (2811). 2811) is connected to the second liquid guiding cavity (2812), the bottom of the mounting block (281) is provided with a liquid guiding port (2813) connected to the second liquid guiding cavity (2812), the filter plate (282) is rotatably connected to the interior of the second liquid guiding cavity (2812), one end of the filter plate (282) is in contact with the lower opening of the first liquid guiding cavity (2811), and the diameter of the second liquid guiding cavity (2812) and the inner diameter of the filter plate (282) are both larger than the inner diameter of the first liquid guiding cavity (2811).

7. The underwater electric winch sealing device according to claim 6, characterized in that: The filter plate (282) is in a vertical state at this time, and the diameter of the filter plate (282) is smaller than the inner diameter of the second liquid guiding cavity (2812).

8. The underwater electric winch sealing device according to claim 6, characterized in that: A first filter screen (283) is embedded and installed inside the liquid guide port (2813), and the distance between the first filter screen (283) and the filter plate (282) is greater than the diameter of the filter plate (282).

9. The underwater electric winch sealing device according to claim 6, characterized in that: The cross-sectional shape of the bottom of the mounting block (281) is in the shape of an arc, and the corners of the mounting block (281) are rounded.

10. The underwater electric winch sealing device according to claim 1, characterized in that: A second filter screen (290) is embedded and installed inside the water guide hole (221), and the bottom of the second filter screen (290) is flush with the lower opening of the water guide hole (221).

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