Electric self-locking safety hatch cover device of bulk cargo ship and working method of electric self-locking safety hatch cover device

Abstract

The invention belongs to the technical field of hatch cover devices, and discloses a bulk carrier electric self-locking safety hatch cover device and a working method thereof.The device comprises a hatch cover and a cover plate, the cover plate is arranged at the top of the hatch cover, an emergency cover is arranged in the cover plate, a hydraulic cylinder is arranged on one side of the hatch cover, and a protruding block is arranged on one side of the cover plate; by means of cooperation of the piston rod, the U-shaped plate, the wrapping ring, the silica gel strip, the inlet pipe, the third hose and the pump body, after the hydraulic cylinder is started, the piston rod in transmission connection with the output shaft of the hydraulic cylinder can be driven to move up and down, and the hydraulic cylinder is driven to move up and down. According to the hatch cover, the cover plate can be automatically opened and closed, the piston rod is smoother in the moving process, vibration and resistance caused by large friction force are reduced, lubricating liquid in the wrapping ring can flow back into the lubricating box through the second hose, and the service life of the hatch cover is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of hatch cover devices, and in particular relates to an electric self-locking safety hatch cover device for a bulk carrier and a working method thereof. Background Art

[0002] A hatch cover device is a sealing device used in ships, submarines, and aircraft vehicles. It is mainly used to close hatches and doors to ensure that the cabin is not affected by the external environment during operation. The hatch cover device includes a hatch cover, which is usually made of metal and has the characteristics of high strength and corrosion resistance. The hatch cover needs to be able to seal the hatch and prevent water and gas leakage. Sealing strips are used between the hatch cover and the hatch to increase the sealing performance. Usually, elastic materials such as rubber and plastic are used. In order to ensure that the hatch cover is firmly closed during use, it is usually equipped with a hydraulic locking mechanism. These mechanisms will fix the hatch cover when it is closed to prevent accidental opening.

[0003] However, the existing electric self-locking safety hatch cover device for bulk carriers and its working method are not perfect and still have certain defects: The piston rod installed in the hydraulic mechanism for closing the hatch cover will produce friction with the cylinder body during movement. If no lubricant is applied, the friction will increase and the wear will increase. Air and moisture will cause the piston rod to rust and corrode, shortening the service life of the hydraulic mechanism, which will affect the opening and closing of the hatch cover. When the hydraulic mechanism fails, the cover cannot be opened in time. In an emergency, the operator cannot enter the hatch. For this reason, an electric self-locking safety hatch cover device for bulk carriers is designed. Summary of the invention

[0004] The object of the present invention is to provide an electric self-locking safety hatch cover device for bulk carriers and a working method thereof, so as to solve the problem proposed in the above-mentioned background technology that failure to apply lubricant will lead to increased friction and increased wear, and air and moisture will cause rust and corrosion of the piston rod, shortening the service life of the hydraulic mechanism, thus affecting the opening and closing of the hatch cover.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: an electric self-locking safety hatch cover device for a bulk carrier, comprising a hatch cover and a cover plate, the cover plate is arranged on the top of the hatch cover, an emergency cover is arranged inside the cover plate, a hydraulic cylinder is arranged on one side of the hatch cover, a bump is arranged on one side of the cover plate, a piston rod is connected to the output shaft of the hydraulic cylinder in a transmission manner, a control frame is fixedly installed on the other side of the cover plate, a screw rod is arranged inside the control frame, a support rod is arranged inside the control frame, an auxiliary plate is sleeved on one end of the screw rod and the support rod, a lubrication box is arranged on one side of the hatch cover, a guide pipe is arranged on one side of the lubrication box, two U-shaped plates are arranged on one side of the hatch cover, two wrapping rings are arranged on one side of the two U-shaped plates, and a plurality of silicone strips are arranged on one side of the four wrapping rings.

[0006] Preferably, one end of the piston rod is fixedly connected to the bottom of the protrusion, the bottom of the auxiliary plate is fixedly connected to the top of the emergency cover, a rotating rod is rotatably installed on the top of the control frame, and one end of the rotating rod is fixedly connected to one end of the screw rod.

[0007] Preferably, a guide tube is inserted and connected inside the reinforcement block, an inlet tube is provided at one end of the guide tube, a third hose is provided at one side of the guide tube, and a vertical tube is provided at the bottom of one of the wrapping rings.

[0008] Preferably, a first hose is provided at one end of the vertical tube, one end of the first hose is interlacedly connected to the top of one of the wrapping rings, and a second hose is interlacedly connected to the bottom of one of the wrapping rings.

[0009] Preferably, one end of the second hose is fixedly connected with one side of the lubrication box, one end of the inlet pipe is connected with the top of the lubrication box, and a pump body is provided on one side of the outlet pipe.

[0010] Preferably, two annular blocks are fixedly installed on the other side of the two U-shaped plates, four recessed holes are opened on one side of the hatch cover, two first reinforcement blocks are fixedly installed on both sides of the cover plate, and two protruding rods are provided at the bottom of the four first reinforcement blocks.

[0011] Preferably, a limiting strip is disposed on one side of each of the four annular blocks, and one end of the four limiting strips is respectively connected to the internal threads of the four recessed holes.

[0012] Preferably, two second reinforcement blocks are fixedly installed on both sides of the hatch cover, two reinforcement columns are arranged on the top of four of the second reinforcement blocks, one end of the eight reinforcement columns is provided with a clamping hole, and one end of the eight protruding rods is respectively engaged with the inside of the eight clamping holes.

[0013] Preferably, the plurality of silicone strips are arranged at equal intervals, a sealing ring is provided at one end of the hydraulic cylinder, and a reinforcement block is provided at one side of the hatch cover.

[0014] A working method of an electric self-locking safety hatch cover device for a bulk carrier comprises the following steps: Step 1: The operator starts the hydraulic cylinder. When the piston rod connected to the output shaft moves up and down, the cover plate and the emergency cover move up and down. When the height of the two is raised, the hatch cover is opened. Step 2: At this time, start the pump body, and the lubricating liquid stored in the lubrication box will be guided to the inside of the two wrapping rings through the inlet pipe and the third hose. The lubricating liquid will rub against the surface of the piston rod through multiple silicone strips, and the piston rod will be smoother during its movement, reducing the vibration and resistance caused by the large friction; Step 3: The lubricating liquid inside the wrapping ring can flow back to the inside of the lubrication box through the second hose, and the outer surfaces of the multiple silicone strips are in contact with both sides of the piston rod respectively. As the piston rod moves downward, the cover plate will also move downward; Step 4: The eight protruding rods will gradually embed into the corresponding card holes, and the two will engage with each other, thereby realizing the self-locking of the hatch cover and the cover plate.

[0015] The beneficial effects of the present invention are as follows: 1. The present invention cooperates with the piston rod, U-shaped plate, wrapping ring, silicone strip, inlet pipe, third hose and pump body. After the hydraulic cylinder is started, the piston rod connected to the output shaft can be driven to move up and down, so that the cover plate can be automatically opened and closed. At the same time, the pump body is started, and the lubricating liquid stored in the lubrication box will be guided to the inside of the two wrapping rings through the inlet pipe and the third hose. The lubricating liquid rubs against the surface of the piston rod through multiple silicone strips. After the lubricating liquid is applied to the surface of the piston rod, the lubricating liquid forms a protective film to reduce direct contact between the metal surfaces, thereby reducing the friction coefficient. The piston rod will be smoother during its movement, reducing vibration and resistance caused by large friction. The lubricating liquid inside the wrapping ring can flow back to the inside of the lubrication box through the second hose, thereby extending the service life of the hatch cover.

[0016] 2. The present invention cooperates with the screw rod, support rod, rotating rod, auxiliary plate, convex rod and reinforcement column. After the rotating rod is rotated clockwise, the screw rod fixedly connected to it can be driven to rotate, and the auxiliary plate mounted thereon can be driven to move upward, so that the emergency cover can be gradually raised, and the operator can enter the hatch through the gap between the cover plate and the emergency cover, thereby solving the problem that the cover plate cannot be opened due to failure of the self-locking mechanism. As the cover plate descends, the eight first reinforcement blocks gradually approach the eight second reinforcement blocks. After one end of the eight convex rods is embedded in the interior of the card hole, the hatch cover and the cover plate can be self-locked as the two are engaged, thereby enhancing the firmness of the installation of the two.

[0017] 3. The present invention cooperates with the annular block, the limit strip, the first hose, the second hose and the vertical tube, so that the lubricating liquid in the lubrication box is transported to the inside of the third hose through the inlet tube and the outlet tube, and then transported to the inside of the second hose through the vertical tube and the first hose. The two limit strips are rotated in the opposite direction to disengage them from the inside of the concave hole, and the U-shaped plate is moved to one side to separate the two wrapping rings from the piston rod, which is convenient for cleaning multiple silicone strips. The sealing ring is located at the connection between the hydraulic cylinder and the piston rod, which enhances the sealing performance between the two. One end of the lubrication box is externally connected to the lubricating liquid. As the pump body is started, the lubricating liquid will be guided to the internal storage of the lubrication box through the guide tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 For the present invention Figure 1 The enlarged view of point A in the middle; Figure 3 It is a front view structural schematic diagram of the present invention; Figure 4 It is a partial front view structural schematic diagram of the present invention; Figure 5 It is a partial exploded view of the present invention; Figure 6 For the present invention Figure 5 The enlarged view of point B in the middle; In the figure: 1. hatch cover; 2. cover plate; 3. emergency cover; 4. hydraulic cylinder; 5. piston rod; 6. convex block; 7. control frame; 8. screw rod; 9. support rod; 10. rotating rod; 11. auxiliary plate; 12. first reinforcement block; 13. convex rod; 14. second reinforcement block; 15. reinforcement column; 16. lubrication box; 17. guide pipe; 18. U-shaped plate; 19. annular block; 20. limit strip; 21. wrapping ring; 22. silicone strip; 23. first hose; 24. second hose; 25. sealing ring; 26. reinforcement block; 27. inlet pipe; 28. outlet pipe; 29. ​​third hose; 30. vertical pipe; 31. pump body. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figures 1 to 6 As shown, the embodiment of the present invention provides a technical solution of a bulk carrier electric self-locking safety hatch cover device and a working method thereof: Embodiment 1

[0021] like Figure 1-2 As shown, an electric self-locking safety hatch cover device for a bulk carrier comprises a hatch cover 1 and a cover plate 2, wherein the cover plate 2 is arranged on the top of the hatch cover 1, an emergency cover 3 is arranged inside the cover plate 2, a hydraulic cylinder 4 is arranged on one side of the hatch cover 1, a convex block 6 is arranged on one side of the cover plate 2, a piston rod 5 is connected to the output shaft of the hydraulic cylinder 4, a control frame 7 is fixedly installed on the other side of the cover plate 2, a screw rod 8 is arranged inside the control frame 7, a support rod 9 is arranged inside the control frame 7, an auxiliary plate 11 is sleeved on one end of the screw rod 8 and the support rod 9, a lubrication box 16 is arranged on one side of the hatch cover 1, a guide pipe 17 is arranged on one side of the lubrication box 16, two U-shaped plates 18 are arranged on one side of the hatch cover 1, two wrapping rings 21 are arranged on one side of the two U-shaped plates 18, and four A plurality of silicone strips 22 are provided on one side of the wrapping ring 21, one end of the piston rod 5 is fixedly connected to the bottom of the protrusion 6, the bottom of the auxiliary plate 11 is fixedly connected to the top of the emergency cover 3, and a rotating rod 10 is rotatably installed on the top of the control frame 7, and one end of the rotating rod 10 is fixedly connected to one end of the screw rod 8. The lubricating fluid rubs against the surface of the piston rod 5 through the plurality of silicone strips 22. After the lubricating fluid is applied to the surface of the piston rod 5, the lubricating fluid forms a protective film to reduce direct contact between the metal surfaces, thereby reducing the friction coefficient. The piston rod 5 will be smoother during its movement, reducing vibration and resistance caused by large friction. The lubricating fluid inside the wrapping ring 21 can flow back to the inside of the lubrication box 16 through the second hose 24, thereby extending the service life of the hatch cover 1. Embodiment 2

[0022] Based on the first embodiment, Figure 2-4As shown, the inside of the reinforcement block 26 is connected with an outlet pipe 28, one end of the outlet pipe 28 is provided with an inlet pipe 27, one side of the outlet pipe 28 is provided with a third hose 29, a vertical pipe 30 is provided at the bottom of one of the wrapping rings 21, one end of the vertical pipe 30 is provided with a first hose 23, one end of the first hose 23 is connected with the top of one of the wrapping rings 21, a second hose 24 is connected with the bottom of one of the wrapping rings 21, one end of the second hose 24 is connected with one side of the lubrication box 16, one end of the inlet pipe 27 is connected with the top of the lubrication box 16, a pump body 31 is provided on one side of the outlet pipe 28, and a screw rod 8 is provided. , support rod 9, rotating rod 10, auxiliary plate 11, convex rod 13 and reinforcement column 15. After rotating rod 10 clockwise, the screw rod 8 fixedly connected thereto can be driven to rotate, and the auxiliary plate 11 mounted thereon can be driven to move upward, and the emergency cover 3 can be gradually raised, and the operator can enter the hatch through the gap between the cover plate 2 and the emergency cover 3, which solves the problem that the cover plate 2 cannot be opened due to failure of the self-locking mechanism. As the cover plate 2 descends, the eight first reinforcement blocks 12 gradually approach the eight second reinforcement blocks 14. After one end of the eight convex rods 13 is embedded in the inside of the card hole, the self-locking of the hatch cover 1 and the cover plate 2 can be achieved as the two are engaged. Embodiment 3

[0023] On the basis of the first and second embodiments, Figure 1 , Figure 5 and Figure 6 As shown, two annular blocks 19 are fixedly installed on the other side of the two U-shaped plates 18, four concave holes are opened on one side of the hatch cover 1, two first reinforcing blocks 12 are fixedly installed on both sides of the cover plate 2, two convex rods 13 are arranged at the bottom of the four first reinforcing blocks 12, one side of the four annular blocks 19 is provided with a limit strip 20, one end of the four limit strips 20 is respectively connected with the internal threads of the four concave holes, two second reinforcing blocks 14 are fixedly installed on both sides of the hatch cover 1, and two reinforcing columns 15 are arranged on the top of the four second reinforcing blocks 14. Eight reinforcing columns One end of each of the hydraulic cylinders 4 and the piston rod 5 is provided with a card hole, and one end of the eight protruding rods 13 is respectively engaged with the inner part of the eight card holes. The two limit strips 20 are rotated in the opposite direction to disengage them from the inside of the concave hole, and the U-shaped plate 18 is moved to one side to separate the two wrapping rings 21 from the piston rod 5, which is convenient for cleaning the multiple silicone strips 22. The sealing ring 25 is located at the connection between the hydraulic cylinder 4 and the piston rod 5, which enhances the sealing performance between the two. One end of the lubrication box 16 is externally connected to the lubricating liquid. As the pump body 31 is started, the lubricating liquid will be guided to the internal storage of the lubrication box 16 through the guide pipe 17.

[0024] A working method of an electric self-locking safety hatch cover device for a bulk carrier comprises the following steps: Step 1: The operator starts the hydraulic cylinder 4. When the piston rod 5 connected to the output shaft moves up and down, the cover plate 2 and the emergency cover 3 are also driven to move up and down. After the heights of the two are raised, the hatch cover 1 is opened; Step 2: At this time, the pump body 31 is started, and the lubricating liquid stored in the lubrication box 16 is directed to the inside of the two wrapping rings 21 through the inlet pipe 27 and the third hose 29. The lubricating liquid rubs against the surface of the piston rod 5 through the multiple silicone strips 22, and the piston rod 5 will be smoother during its movement, reducing the vibration and resistance caused by the large friction; Step 3: The lubricating liquid inside the wrapping ring 21 can flow back to the inside of the lubrication box 16 through the second hose 24, and the outer surfaces of the plurality of silicone strips 22 are in contact with both sides of the piston rod 5 respectively. As the piston rod 5 moves downward, the cover plate 2 will also move downward; Step 4: The eight protruding rods 13 will also be gradually embedded into the corresponding locking holes, and the two will be engaged with each other, thereby achieving self-locking of the hatch cover 1 and the cover plate 2.

[0025] The working principle and use process of the present invention: The hatch cover device is a sealing device used for ships, submarines, and aircraft vehicles. It is mainly used to close hatches and doors to ensure that the cabin is not affected by the external environment during operation. The hatch cover device includes a hatch cover, which is usually made of metal and has the characteristics of high strength and corrosion resistance. The hatch cover needs to be able to seal the hatch and prevent water and gas leakage. A sealing strip is used between the hatch cover and the hatch to increase the sealing performance. Usually, elastic materials such as rubber and plastic are used. In order to ensure that the hatch cover is firmly closed during use, it is usually equipped with a hydraulic locking mechanism. These mechanisms will fix the hatch cover when it is closed to prevent accidental opening. The hydraulic mechanism for closing the hatch cover The installed piston rod 5 will generate friction with the cylinder body during movement. If no lubricant is applied, the friction will be aggravated and the wear will be increased. Air and moisture will cause the piston rod 5 to rust and corrode, shortening the service life of the hydraulic mechanism, which will affect the opening and closing of the hatch cover. When the hydraulic mechanism fails, the cover cannot be opened in time. In an emergency, the operator cannot enter the hatch. For this purpose, an electric self-locking safety hatch cover device for bulk carriers is designed. After starting the hydraulic cylinder 4, the piston rod 5 connected to its output shaft can be driven up and down to complete the automatic opening and closing of the cover 2. At the same time, the pump body 31 is started, and the lubricating fluid stored in the lubrication box 16 will be diverted to the two wrapping rings 21 through the inlet pipe 27 and the third hose 29. Inside, the lubricating liquid rubs against the surface of the piston rod 5 through multiple silicone strips 22. After the lubricating liquid is applied to the surface of the piston rod 5, the lubricating liquid forms a protective film to reduce direct contact between the metal surfaces, thereby reducing the friction coefficient. The piston rod 5 will be smoother during its movement, reducing vibration and resistance caused by large friction. The lubricating liquid inside the wrapping ring 21 can flow back to the inside of the lubrication box 16 through the second hose 24, extending the service life of the hatch cover 1. After the rotating rod 10 is rotated clockwise, the screw rod 8 fixedly connected to it can be driven to rotate, which in turn drives the auxiliary plate 11 mounted thereon to move upward, and the emergency cover 3 can be gradually raised, and the operator can enter the hatch through the gap between the cover plate 2 and the emergency cover 3, solving the problem. The problem that the cover plate 2 cannot be opened due to the failure of the self-locking mechanism is solved. As the cover plate 2 descends, the eight first reinforcement blocks 12 gradually approach the eight second reinforcement blocks 14. After one end of the eight protruding rods 13 is embedded in the inside of the card hole, the self-locking of the hatch cover 1 and the cover plate 2 can be achieved with the card engagement of the two, thereby enhancing the firmness of the installation of the two. The lubricating liquid in the lubrication box 16 is transported to the inside of the third hose 29 through the inlet pipe 27 and the outlet pipe 28, and then transported to the inside of the second hose 24 through the vertical pipe 30 and the first hose 23. The two limit strips 20 are rotated in the opposite direction to be separated from the inside of the concave hole, and the U-shaped plate 18 is moved to one side to separate the two wrapping rings 21 from the piston rod 5, which is convenient for cleaning the multiple silicone strips 22.The sealing ring 25 is located at the connection between the hydraulic cylinder 4 and the piston rod 5, which enhances the sealing performance between the two. One end of the lubrication box 16 is connected to the lubricating liquid. As the pump body 31 is started, the lubricating liquid will be guided to the internal storage of the lubrication box 16 through the guide pipe 17.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric self-locking safety hatch cover device for a bulk carrier, comprising a hatch cover (1) and a cover plate (2), wherein the cover plate (2) is arranged on the top of the hatch cover (1), and is characterized in that: An emergency cover (3) is arranged inside the cover plate (2), a hydraulic cylinder (4) is arranged on one side of the hatch cover (1), a convex block (6) is arranged on one side of the cover plate (2), an output shaft of the hydraulic cylinder (4) is drivingly connected to a piston rod (5), a control frame (7) is fixedly mounted on the other side of the cover plate (2), a screw rod (8) is arranged inside the control frame (7), a support rod (9) is arranged inside the control frame (7), an auxiliary plate (11) is sleeved on one end of the screw rod (8) and the support rod (9), a lubrication box (16) is arranged on one side of the hatch cover (1), a guide pipe (17) is arranged on one side of the lubrication box (16), two U-shaped plates (18) are arranged on one side of the two U-shaped plates (18), two wrapping rings (21) are arranged on one side of the four wrapping rings (21), and a plurality of silicone strips (22) are arranged on one side of each of the four wrapping rings (21).

2. The electric self-locking safety hatch cover device for bulk carriers according to claim 1, characterized in that: One end of the piston rod (5) is fixedly connected to the bottom of the protrusion (6), the bottom of the auxiliary plate (11) is fixedly connected to the top of the emergency cover (3), and a rotating rod (10) is rotatably mounted on the top of the control frame (7), and one end of the rotating rod (10) is fixedly connected to one end of the screw rod (8).

3. The electric self-locking safety hatch cover device for bulk carriers according to claim 1, characterized in that: The reinforcement block (26) is internally connected with an outlet pipe (28), one end of the outlet pipe (28) is provided with an inlet pipe (27), one side of the outlet pipe (28) is provided with a third hose (29), and a vertical pipe (30) is provided at the bottom of one of the wrapping rings (21).

4. The electric self-locking safety hatch cover device for bulk carriers according to claim 3 is characterized in that: A first hose (23) is provided at one end of the vertical tube (30), one end of the first hose (23) is interpenetratingly connected to the top of one of the wrapping rings (21), and a second hose (24) is interpenetratingly connected to the bottom of one of the wrapping rings (21).

5. The electric self-locking safety hatch cover device for bulk carriers according to claim 4, characterized in that: One end of the second hose (24) is fixedly connected to one side of the lubrication box (16), one end of the inlet pipe (27) is connected to the top of the lubrication box (16), and a pump body (31) is provided on one side of the outlet pipe (28).

6. The electric self-locking safety hatch cover device for bulk carriers according to claim 1, characterized in that: Two annular blocks (19) are fixedly mounted on the other side of the two U-shaped plates (18), four recessed holes are provided on one side of the hatch cover (1), two first reinforcement blocks (12) are fixedly mounted on both sides of the cover plate (2), and two convex rods (13) are provided at the bottom of the four first reinforcement blocks (12).

7. The electric self-locking safety hatch cover device for bulk carriers according to claim 6, characterized in that: A limiting strip (20) is provided on one side of each of the four annular blocks (19), and one end of the four limiting strips (20) is respectively connected to the internal threads of the four recessed holes.

8. The electric self-locking safety hatch cover device for bulk carriers according to claim 7, characterized in that: Two second reinforcement blocks (14) are fixedly mounted on both sides of the hatch cover (1), two reinforcement columns (15) are arranged on the top of four of the second reinforcement blocks (14), one end of the eight reinforcement columns (15) is provided with a clamping hole, and one end of the eight protruding rods (13) is respectively engaged with the inside of the eight clamping holes.

9. The electric self-locking safety hatch cover device for bulk carriers according to claim 1, characterized in that: The plurality of silica gel strips (22) are arranged at equal intervals, a sealing ring (25) is provided at one end of the hydraulic cylinder (4), and a reinforcement block (26) is provided at one side of the hatch cover (1).

10. A working method of an electric self-locking safety hatch cover device for a bulk carrier, the method being applicable to the electric self-locking safety hatch cover device for a bulk carrier as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: The operator starts the hydraulic cylinder (4), and when the piston rod (5) connected to the output shaft thereof moves up and down, the cover plate (2) and the emergency cover (3) are driven to move up and down. When the heights of the two are raised, the hatch cover (1) is opened; Step 2: At this time, the pump body (31) is started, and the lubricating liquid stored in the lubrication box (16) is guided to the inside of the two wrapping rings (21) through the inlet pipe (27) and the third hose (29). The lubricating liquid rubs against the surface of the piston rod (5) through the plurality of silicone strips (22), and the piston rod (5) moves more smoothly during its movement, reducing vibration and resistance caused by high friction. Step 3: The lubricating liquid inside the wrapping ring (21) can flow back into the lubrication box (16) through the second hose (24), and the outer surfaces of the plurality of silicone strips (22) are in contact with both sides of the piston rod (5), respectively. As the piston rod (5) moves downward, the cover plate (2) will also move downward; Step 4: The eight protruding rods (13) will also gradually embed into the corresponding locking holes, and the two will engage with each other, thereby achieving self-locking of the hatch cover (1) and the cover plate (2).

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