Underwater construction observation room with easily adjustable buoyancy

Abstract

This invention provides an underwater construction observation room with easily adjustable buoyancy, relating to the field of diving equipment technology. It includes a main frame, a central observation chamber, side buoyancy frames, and upper buoyancy compressed air tanks. The central observation chamber is located in the middle of the main frame, and side buoyancy frames are located on both sides of the main frame. Upper buoyancy compressed air tanks are fixedly connected to both sides of the upper part of the main frame. Propeller propulsion modules are symmetrically and rotatably connected to both sides of the side buoyancy frames. A ballast water tank is fixedly connected to the middle of the side buoyancy frames, and an internal airbag is fixedly connected inside the ballast water tank. Side connecting rods are rotatably connected to both sides of the side buoyancy frames. During sinking, after the ballast water tank is filled with water, the two side buoyancy frames adhere to the lower sides of the main frame, shifting the center of gravity below the buoyancy center. This improves the stability and balance of the main frame during sinking and increases the sinking speed, solving the problem of instability caused by the center of gravity being too close to the buoyancy center in the underwater construction observation room.

Description

Technical Field

[0001] This invention relates to the field of diving equipment technology, and in particular to underwater observation rooms with easily adjustable buoyancy. Background Technology

[0002] The underwater construction observation room is a sealed cabin that can be submerged underwater. It provides on-site observation and operational support for underwater rescue and salvage, underwater engineering monitoring, scientific research and exploration.

[0003] The existing device has a fixed ballast tank design, and buoyancy is adjusted by the intake and drainage of the ballast tank. This results in a narrow buoyancy adjustment range, small changes in the relative position of the center of gravity and the center of buoyancy, and the center of gravity and the center of buoyancy being relatively close. This makes it susceptible to yaw caused by water flow impact, resulting in poor balance stability and a tendency to tilt or even capsize. In addition, the existing device requires the overall frame to be driven underwater to change the observation direction. Underwater turning is easily affected by water flow interference, making operation difficult. The operation of comprehensive observation of fixed construction areas (such as submarine pipeline interfaces and bridge pier foundations) is extremely difficult. Summary of the Invention

[0004] This invention provides an underwater observation chamber with convenient buoyancy adjustment. During sinking, after the ballast tank is filled with water, the two side buoyancy frames are attached to the lower sides of the main frame, and the center of gravity shifts to below the center of buoyancy, improving the stability and balance of the main frame during sinking and increasing the sinking speed. During the rising and floating phase, the ballast tank providing buoyancy is located at the top, causing the center of buoyancy to move further upward and above the center of gravity, making the rising speed more synchronized and maintaining the stability of the rising. This avoids the situation where the ballast tank is at the bottom, which would cause the center of buoyancy to be unstable, tilting, or even overturning. It takes into account the adjustment of the center of buoyancy during both rising and sinking. The central observation chamber rotates circumferentially around the central connecting frame to adjust the position of the observation window. The switching of the direction of the central observation chamber and the observation window can be achieved without the need for underwater turning of the central connecting frame or underwater turning operations of the central connecting frame.

[0005] This invention provides an underwater observation bay with convenient buoyancy adjustment, specifically comprising: a main frame, a central observation chamber, side buoyancy frames, and an upper buoyancy compressed air tank. The central observation chamber is located in the middle of the main frame, side buoyancy frames are located on both sides of the main frame, upper buoyancy compressed air tanks are fixedly connected to both sides of the upper part of the main frame, a central connecting frame is fixedly connected to the middle of the main frame, a lower telescopic cylinder is fixedly connected to the lower part of the main frame, lower L-shaped supports are fixedly connected to both sides of the bottom of the main frame, L-shaped movable supports are slidably connected to both sides of the bottom of the main frame, the L-shaped movable supports and the lower L-shaped supports are symmetrically arranged, upper pins are slidably connected to both sides of the upper part of the main frame, and upper telescopic cylinders are fixedly connected to both sides of the upper part of the main frame.

[0006] Furthermore, the telescopic rod of the lower telescopic cylinder is fixedly connected to the L-shaped movable bracket, and the L-shaped movable bracket and the lower L-shaped bracket are slidably connected to both sides of the ballast counterweight. The L-shaped movable bracket and the lower L-shaped bracket are slidably engaged to clamp and fix the ballast counterweight. The extension of the telescopic rod of the lower telescopic cylinder pushes the L-shaped movable bracket to move and separate from the ballast counterweight, thereby realizing the release of the ballast counterweight. The telescopic rod of the upper telescopic cylinder is fixedly connected to the upper pin.

[0007] Furthermore, transparent observation windows are provided on both sides of the central observation chamber. An upper access passage is welded to the upper part of the central observation chamber, and a sealed cover is provided on the upper part of the upper access passage. A lower connecting frame is welded and fixed to the lower part of the central observation chamber. A drive worm gear is rotatably connected to the inner side of the lower connecting frame, and the drive motor at the tail end of the drive worm gear is fixedly connected to the lower connecting frame.

[0008] Furthermore, the lower connecting frame and the middle connecting frame are rotatably connected by rotating shafts, the worm gear at the top of the middle connecting frame is meshed with the drive worm, and the upper access channel and the upper part of the main frame are circumferentially connected by a deep-sea pressure-resistant bearing. The middle observation chamber can rotate 360° continuously around the middle connecting frame, which is convenient for all-round observation without the need to drive the main frame to turn.

[0009] Furthermore, propeller propulsion modules are symmetrically rotatably connected to both sides of the side buoyancy frame. The central shaft of the propeller propulsion module, in conjunction with a motor, achieves vertical rotation, providing horizontal movement power and vertical auxiliary lifting power. The propeller propulsion module provides power for horizontal and vertical movement. A ballast water tank is fixedly connected to the center of the side buoyancy frame, and an internal air bladder is fixedly connected inside the ballast water tank. Side compressed air tanks are fixedly connected to the top and bottom of the side buoyancy frame. Side connecting rods are rotatably connected to both sides of the side buoyancy frame. A lower connecting pipe is provided at the bottom of the ballast water tank, which is connected to seawater. An electromagnetic sea valve is provided on the lower connecting pipe of the ballast water tank. When sinking, the electromagnetic sea valve opens, and seawater enters the ballast water tank under water pressure. The internal air bladder is in a natural contraction state, and the weight of the device increases, thus sinking.

[0010] Furthermore, the side compressed air tank and the inner air bladder are connected by a solenoid valve and a pipeline. When the solenoid valve is opened, the side compressed air tank is connected to the inner air bladder inside the ballast water tank for inflation. The inner air bladder squeezes out the seawater in the ballast water tank to increase buoyancy and achieve the floating operation. The upper end of the side connecting rod is rotatably connected to the middle of the main frame. When sinking, the two side buoyancy frames are attached to the lower two sides of the main frame to shift the center of gravity to below the center of buoyancy.

[0011] Furthermore, when the upper pin and the middle insertion hole of the side buoyancy frame are in the sliding insertion state, the side buoyancy frame is fixed to the top of the main frame. Both the side buoyancy frame and the ballast water tank are located on the top two sides of the main frame, ensuring that the side buoyancy frame is reliably fixed to the main frame in the floating state, avoiding displacement caused by water flow impact. During the rising and floating stage, the ballast water tank that provides buoyancy is located at the top, causing the center of buoyancy to move further upward and be higher than the center of gravity, making the floating more stable, reducing the risk of tilting, and avoiding the situation where the ballast water tank is located at the bottom, which would cause the center of buoyancy to be unstable and tilt or even overturn. This helps the ballast water tank and the side buoyancy frame float on the water surface.

[0012] Furthermore, the sliding sleeve at the front end of the buoyancy compressed air tank forms a sleeve-type telescopic structure. An external telescopic sealing pipe is fixedly connected between the buoyancy compressed air tank and the telescopic cylinder. The external telescopic sealing pipe wraps around the sliding connection between the telescopic cylinder and the buoyancy compressed air tank to prevent seawater from seeping in. The telescopic cylinder is slidably connected to both sides of the top of the main frame. The buoyancy compressed air tank inflates the telescopic cylinder, and the inflation supports the axial expansion of the telescopic cylinder.

[0013] This invention provides an underwater observation bay with easily adjustable buoyancy, offering the following advantages: During descent, after the ballast tanks are filled with water, the two side buoyancy frames fit against the lower sides of the main frame, shifting the center of gravity below the buoyancy center. This improves the stability and balance of the main frame during descent and increases the descent speed. During the ascent and buoyancy phase, the ballast tanks providing buoyancy are located at the top, causing the buoyancy center to move further upward and above the center of gravity. This results in a more synchronized ascent speed and maintains stability during ascent, preventing the buoyancy center from becoming unstable due to the ballast tanks being at the bottom, which could lead to tilting or even overturning. This also takes into account the adjustment of the buoyancy center during ascent and descent, making both ascent and descent more stable. This solves the problems of fixed buoyancy center, narrow buoyancy adjustment range, and easy tilting and overturning during ascent in traditional underwater observation devices.

[0014] When on the water, the two side buoyancy frames are attached to the lower sides of the main frame. The ballast water tank and the side buoyancy frames float on the water. The upper buoyancy compressed air tank and telescopic cylinder are inflated and expanded to increase the floating area on the water surface, reduce the risk of tilting, improve the stability when floating on the water surface, and facilitate the entry and exit of personnel on the water surface. This solves the problems of the existing device having a small floating area on the water surface, a low center of gravity, being easily tilted by wind and waves, and inconvenience for personnel to enter and exit.

[0015] The mid-observation cabin rotates circumferentially around the mid-connecting rotating frame to adjust the position of the observation window. Without the need for underwater turning of the mid-connecting rotating frame, the orientation of the mid-observation cabin and the observation window can be switched, making it more convenient to conduct underwater observations around the fixed construction location and reducing the difficulty of underwater operations. Attached Figure Description

[0016] To more clearly illustrate the technical solution of the present invention, the accompanying drawings will be briefly described below.

[0017] The accompanying drawings described below are only related to some embodiments of the invention and are not intended to limit the invention.

[0018] In the attached diagram: Figure 1 A schematic diagram of the overall structure of this application is shown; Figure 2 A schematic diagram of the main framework structure of this application is shown; Figure 3 A schematic diagram of the lower L-shaped support structure of this application is shown; Figure 4 A schematic diagram of the structure of the observation cabin in this application is shown; Figure 5 A schematic diagram of the side buoyancy frame of this application is shown; Figure 6 A cross-sectional structural schematic diagram of the ballast water tank of this application is shown; Figure 7 A cross-sectional structural schematic diagram of the external telescopic sealing tube of this application is shown; Figure 8 The diagram shows the main frame, the central observation chamber, and the side buoyancy support of this application in their separated states.

[0019] Figure label: 1. Main frame; 101. Middle connecting frame; 102. Lower telescopic cylinder; 103. Lower L-shaped bracket; 104. Ballast counterweight; 105. L-shaped moving bracket; 106. Upper pin; 107. Upper telescopic cylinder; 2. Middle observation chamber; 201. Observation window; 202. Upper access passage; 203. Lower connecting frame; 204. Drive worm gear; 3. Side buoyancy frame; 301. Propeller propulsion module; 302. Ballast water tank; 303. Internal airbag; 304. Side compressed air tank; 305. Side connecting rod; 306. Lower connecting pipe; 4. Buoyancy compressed air tank; 401. Telescopic cylinder; 402. External telescopic sealing pipe. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] Example 1: Please refer to... Figures 1 to 8 : This invention proposes an underwater observation bay with convenient buoyancy adjustment, comprising a main frame 1, a central observation chamber 2, side buoyancy frames 3, and an upper buoyancy compressed air tank 4. A central connecting frame 101 is fixedly connected to the middle of the main frame 1. A lower telescopic cylinder 102 is fixedly connected to the lower part of the main frame 1. Lower L-shaped supports 103 are fixedly connected to both sides of the bottom of the main frame 1. L-shaped movable supports 105 are slidably connected to both sides of the bottom of the main frame 1. The L-shaped movable supports 105 and the lower L-shaped supports 103 are symmetrically arranged. Upper pins 106 are slidably connected to both sides of the upper part of the main frame 1. Upper telescopic cylinders 107 are fixedly connected to both sides of the upper part of the main frame 1. The telescopic rod of the lower telescopic cylinder 102 is fixedly connected to the L-shaped movable supports 105. The L-shaped movable supports 105 and the lower L-shaped supports 103 are slidably connected to the ballast counterweight 104. On both sides, L-shaped moving bracket 105 and lower L-shaped bracket 103 cooperate to clamp and fix ballast counterweight 104. The extension rod of lower telescopic cylinder 102 extends to push L-shaped moving bracket 105 to move and separate from ballast counterweight 104, realizing the release of ballast counterweight 104. The extension rod of upper telescopic cylinder 107 and upper pin 106 are fixedly connected. A middle observation chamber 2 is set in the middle of the main frame 1. Transparent observation windows 201 are opened on both sides of the middle observation chamber 2. The upper part of the middle observation chamber 2 is welded and connected to the upper access passage 202. A sealed cover is set on the upper part of the upper access passage 202. The lower part of the middle observation chamber 2 is welded and fixed to the lower connecting frame 203. The inner side of the lower connecting frame 203 is rotatably connected to the drive worm gear 204. The drive motor at the tail end of the drive worm gear 204 is fixedly connected to the lower connecting frame 203. Both sides of the main frame 1 are provided with side buoyancy frames 3. Propeller propulsion modules 301 are symmetrically rotatably connected to both sides of the side buoyancy frames 3. The central shaft of the propeller propulsion module 301, in conjunction with a motor, achieves vertical rotation, providing horizontal movement power and vertical auxiliary lifting power. The propeller propulsion module 301 provides power for horizontal and vertical movement. A ballast water tank 302 is fixedly connected to the center of the side buoyancy frame 3. An internal air bladder 303 is fixedly connected inside the ballast water tank 302. Side compressed air tanks 304 are fixedly connected to the top and bottom of the side buoyancy frame 3. Side connecting rods 305 are rotatably connected to both sides of the side buoyancy frame 3. A lower connecting pipe 306 is connected to the bottom of the ballast water tank 302, allowing it to connect to seawater. An exhaust valve is installed at the top of the ballast water tank 302. The device is equipped with an electromagnetic sea valve. When sinking, the electromagnetic sea valve opens, and seawater enters the ballast water tank 302 under water pressure. The internal air bladder 303 is in a naturally contracted state, and the weight of the device increases, thus sinking. Buoyancy compression tanks 4 are fixedly connected to both sides of the upper part of the main frame 1. The front end of the buoyancy compression tank 4 is slidably fitted with a telescopic cylinder 401 to form a sleeve-type telescopic structure. An external telescopic sealing pipe 402 is fixedly connected between the buoyancy compression tank 4 and the telescopic cylinder 401. The external telescopic sealing pipe 402 wraps around the sliding connection between the telescopic cylinder 401 and the buoyancy compression tank 4 to prevent seawater from seeping in. The telescopic cylinder 401 is slidably connected to both sides of the top of the main frame 1. The buoyancy compression tank 4 inflates the telescopic cylinder 401. The inflation supports the axial expansion of the telescopic cylinder 401, which increases the total floating area on the water surface, improves the ability to resist wind and waves, reduces the risk of tilting, and achieves stable docking in wind and waves.

[0022] In this embodiment, the lower connecting frame 203 and the middle connecting frame 101 are rotatably connected by a rotating shaft. The worm gear at the top of the middle connecting frame 101 and the drive worm 204 are meshed together. The upper access channel 202 and the upper part of the main frame 1 are circumferentially connected by a deep-sea pressure-resistant bearing. The middle observation chamber 2 can rotate 360° continuously around the middle connecting frame 101, which is convenient for all-round observation. There is no need to drive the main frame 1 to turn as a whole, and there is no need for complicated underwater turning attitude adjustment. Operators can get started without professional skills training, and the operation difficulty is greatly reduced.

[0023] In this embodiment, the side compressed air tank 304 and the inner air bladder 303 are connected by a solenoid valve and a pipeline. After the solenoid valve is opened, the side compressed air tank 304 is connected to the inner air bladder 303 inside the ballast water tank 302 for inflation. The inner air bladder 303 squeezes out the seawater in the ballast water tank 302 to increase buoyancy and achieve the floating operation. The upper end of the side connecting rod 305 is rotatably connected to the middle of the main frame 1. When sinking, the two side buoyancy frames 3 are attached to the lower sides of the main frame 1 to shift the center of gravity to below the center of buoyancy, forming a stable sinking torque to ensure the stability and balance of the main frame 1 when sinking.

[0024] In this embodiment, when the upper pin 106 and the middle insertion hole of the side buoyancy frame 3 are in the sliding insertion state, the side buoyancy frame 3 is fixed to the top of the main frame 1. The side buoyancy frame 3 and the ballast water tank 302 are both located on the top sides of the main frame 1, ensuring that the side buoyancy frame 3 is reliably fixed to the main frame 1 in the floating state, avoiding displacement caused by water flow impact. During the rising and floating stage, the ballast water tank 302 that provides buoyancy is located at the upper part, which makes the center of buoyancy move further upward and higher than the center of gravity, making the floating more stable and reducing the risk of tilting. This avoids the situation where the ballast water tank 302 is located at the lower part, which would cause the center of buoyancy to be unstable and tilt or even overturn. This improves the floating area above the water surface of the ballast water tank 302 and the side buoyancy frame 3, increases the stability on the water surface, and facilitates personnel landing on the water surface.

[0025] In this second embodiment, based on the first embodiment, a lower telescopic cylinder 102 and an upper pin 106 are provided on both sides of the lower part of the main frame 1. The side buoyancy frame 3 is fixed to both sides of the lower part of the main frame 1 by sliding through the insertion holes in the lower part of the main frame 1 and the middle part of the side buoyancy frame 3, so as to realize the positioning work of the side buoyancy frame 3 during the underwater and sinking stages.

[0026] The working principle of this invention: This solution is applicable to near-shore or river observation operations at depths of 0-100 meters, specifically in tasks such as submarine pipeline inspection, bridge pier foundation testing, shallow-sea scientific research, intertidal ecology, near-shore geological surveys, and shipwreck rescue. Personnel enter the middle observation chamber 2 through the upper access passage 202 and conduct underwater observations through the transparent observation window 201. After the ballast tank 302 is filled with water, the total weight of the device increases. Under the influence of gravity, the side buoyancy frames 3 on both sides move downwards and fit against the lower sides of the main frame 1, causing the center of gravity to shift below the buoyancy center, forming a stable sinking moment. This effectively counteracts the yaw risk caused by water flow impact, further reducing horizontal deviation during sinking and improving balance stability. It also increases sinking speed, adapting to the rapid deployment requirements of water depths of 0-500 meters. During underwater operations, the propeller... The propulsion module 301 provides power for the synchronous horizontal and vertical movement of the side buoyancy frame 3 and the main frame 1. When it is necessary to float, the side compressed air tank 304 inflates the inner air bladder 303 to quickly expel the seawater in the ballast water tank 302. At the same time, the side buoyancy frame 3 flips upward with the side connecting rod 305, and the side buoyancy frame 3 fits against the top two sides of the main frame 1, so that the center of buoyancy moves up by 300-500mm from the sinking state, and the center of buoyancy is 100-200mm higher than the center of gravity, forming a strong buoyancy matrix. This solves the problem that traditional devices are prone to tilting when floating due to the fixed center of buoyancy. The risk of tilting is reduced. Even when encountering the impact of ocean currents, it can still maintain stable floating. This solves the problems of the fixed center of buoyancy, the inability to adjust the relative position of the center of gravity and the center of buoyancy of existing underwater observation devices, the easy yaw when sinking, the easy tilting and overturning when floating, and the narrow buoyancy adjustment range. The side buoyancy frames 3 on both sides of the top of the main frame 1 form a symmetrical floating structure with the ballast water tank 302. With the buoyancy compressed air tank 4 driving the telescopic cylinder 401 to expand axially, the total floating area on the water surface is increased, which improves the ability to resist wind and waves, reduces the risk of tilting, and achieves stable docking in wind and waves. It also facilitates personnel access and the stable floating state provides a safe platform for equipment loading and unloading and sample transfer, significantly improving the convenience of operation. This solves the problems of small floating area, low center of gravity, easy tilting due to wind and waves, and inconvenience for personnel access in the existing device. The central observation chamber 2 is driven by a worm gear 204 that meshes with the worm wheel at the top of the central connecting frame 101, allowing it to rotate continuously around the central connecting frame 101. The observation window 201 can be quickly switched to any observation direction without driving the main frame 1 to rotate as a whole. This enables all-round observation around fixed construction locations such as submarine pipeline interfaces and bridge pier foundations, reducing blind spots. Compared with traditional devices, the overall turning operation speed is faster, and there is no need for complex underwater turning attitude adjustments. Operators can get started without professional skills training, greatly reducing the difficulty of operation.

[0027] The following points should be noted in this article: 1. The accompanying drawings of the embodiments disclosed herein only involve structures relevant to the embodiments disclosed herein; other structures may refer to general designs.

[0028] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.

[0029] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. An underwater observation room designed for easy buoyancy adjustment, including: The main frame (1), the central observation chamber (2), the side buoyancy frame (3) and the upper buoyancy compressed air tank (4) are characterized in that the central observation chamber (2) is provided in the middle of the main frame (1), the side buoyancy frames (3) are provided on both sides of the main frame (1), the upper buoyancy compressed air tank (4) is fixedly connected to both sides of the upper part of the main frame (1), the propeller propulsion module (301) is symmetrically rotated and connected to both sides of the side buoyancy frame (3), the ballast water tank (302) is fixedly connected to the middle of the side buoyancy frame (3), the inner airbag (303) is fixedly connected inside the ballast water tank (302), the side compressed air tank (304) is fixedly connected to the upper and lower parts of the side buoyancy frame (3), the side connecting rod (305) is rotatably connected to both sides of the side buoyancy frame (3), and the bottom of the ballast water tank (302) is connected to the lower connecting pipe (306).

2. The underwater observation bay with easily adjustable buoyancy as described in claim 1, characterized in that, The main frame (1) is fixedly connected to a middle connecting frame (101) in the middle, and a lower telescopic cylinder (102) is fixedly connected to the lower part of the main frame (1). Both sides of the bottom of the main frame (1) are fixedly connected to lower L-shaped brackets (103). Both sides of the bottom of the main frame (1) are slidably connected to L-shaped moving brackets (105). Both sides of the upper part of the main frame (1) are slidably connected to upper pins (106). Both sides of the upper part of the main frame (1) are fixedly connected to upper telescopic cylinders (107).

3. The underwater observation bay with easily adjustable buoyancy as described in claim 2, characterized in that, The telescopic rod of the lower telescopic cylinder (102) is fixedly connected to the L-shaped moving bracket (105), and the L-shaped moving bracket (105) and the lower L-shaped bracket (103) are slidably connected to both sides of the ballast counterweight (104). The telescopic rod of the upper telescopic cylinder (107) is fixedly connected to the upper pin (106).

4. The underwater observation bay with easily adjustable buoyancy as described in claim 2, characterized in that, The middle observation chamber (2) has observation windows (201) on both sides. The upper part of the middle observation chamber (2) is welded and connected to the upper entrance and exit passage (202). The lower part of the middle observation chamber (2) is welded and fixed to the lower part. The inner side of the lower connecting frame (203) is rotatably connected to the drive worm gear (204).

5. The underwater observation bay with easily adjustable buoyancy as described in claim 4, characterized in that, The lower connecting frame (203) and the middle connecting frame (101) are rotatably connected by rotating shafts. The worm gear at the top of the middle connecting frame (101) and the drive worm (204) are meshed together. The upper inlet / outlet channel (202) and the upper part of the main frame (1) are rotatably connected in the upper circumferential direction.

6. The underwater observation bay with easily adjustable buoyancy as described in claim 5, characterized in that, The side compressed air tank (304) and the inner air bladder (303) are connected by a pipe, and the upper end of the side connecting rod (305) is rotatably connected to the middle of the main frame (1).

7. The underwater observation bay with easily adjustable buoyancy as described in claim 6, characterized in that, When the upper pin (106) and the middle insertion hole of the side buoyancy frame (3) are in the sliding state, the side buoyancy frame (3) is fixed on the top of the main frame (1), and the side buoyancy frame (3) and the ballast water tank (302) are both located on the top sides of the main frame (1).

8. The underwater observation bay with easily adjustable buoyancy as described in claim 1, characterized in that, The buoyancy compressed air tank (4) has a sliding sleeve telescopic cylinder (401) at its head end. An external telescopic sealing pipe (402) is fixedly connected between the buoyancy compressed air tank (4) and the telescopic cylinder (401). The telescopic cylinder (401) is slidably connected to both sides of the top of the main frame (1).

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