Ship hatch cover plate structure and using method thereof

Abstract

The invention discloses a ship hatch cover plate structure and a using method thereof, and relates to the technical field of ships, the ship hatch cover plate structure comprises a box cover, a pair of rectangular frames are arranged on the two sides of the top surface of the box cover, a pair of trapezoidal plates are fixedly arranged on the front side and the rear side of the top surface of the box cover, and a pair of first cover plates are hinged between the pair of trapezoidal plates; a second cover plate is hinged to the top edge of each first cover plate; the bottom edge of each second cover plate is provided with a third cover plate, the top edge of each third cover plate is provided with a fourth cover plate in a hinged mode, and the first cover plate, the second cover plate, the third cover plate and the fourth cover plate which are located on the same side are distributed in an M shape. In the ship sailing process, especially under the severe sea condition, the hatch cover plates need to be kept stable, the cover plates are mutually restricted and supported through the design of the M-shaped folding shape, and a stable structural system is formed; when the cover plate is subjected to transverse and longitudinal external force, the cover plate is not prone to shifting or loosening, and the safety of the ship in the whole voyage is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a ship hatch cover structure and a use method thereof. Background Art

[0002] In the shipping industry, the automated control of hatch covers is essential to ensure cargo safety, improve transportation efficiency and protect personnel safety. Ship hatch cover structures play an important role in the modern shipping industry, mainly used to ensure the effective closure of the hatches on each deck of the ship, prevent the leakage of seawater or harmful goods, and ensure the safety of navigation and the integrity of cargo.

[0003] The existing ship hatch cover structure has some defects and shortcomings: some automatically controlled hatch cover mechanisms have appeared on the market, but these devices generally have problems such as complex structure, high cost, and difficult maintenance; some hatch covers have certain safety hazards during transportation operations, especially during the closing and opening process. Improper operation may cause damage to the cover, which in turn affects navigation safety. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a ship hatch cover structure and a use method thereof.

[0005] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0006] A ship hatch cover structure, comprising a box cover, a pair of symmetrically distributed rectangular through holes are opened on both sides of the top surface of the box cover, a pair of symmetrically distributed rectangular frames are fixed on both sides of the top surface of the box cover, and each of the rectangular frames is connected to the rectangular through hole on the adjacent side in a penetrating manner;

[0007] A pair of staggered trapezoidal plates are fixedly provided on the front and rear sides of the top surface of the box cover, a pair of first cover plates arranged upward in an "eight" shape are hingedly provided between the pair of trapezoidal plates, and a second cover plate arranged downward in a "V" shape is hingedly provided on the top edge of each of the first cover plates;

[0008] The bottom edge of each of the second cover plates is provided with a third cover plate distributed upward in an "eight" shape, and the top edge of each of the third cover plates is hingedly provided with a fourth cover plate distributed downward in a "V" shape. The first cover plate, the second cover plate, the third cover plate, and the fourth cover plate located on the same side are distributed in an "M" shape.

[0009] Preferably, a first rectangular notch is formed in the middle section of the top edge of the first cover plate, a first rectangular convex edge is fixed to the middle section of the top edge of the second cover plate, and front and rear ends of the first rectangular convex edge are hingedly engaged in the first rectangular notch through a pair of first pins.

[0010] Preferably, a second rectangular convex edge is fixedly provided on the middle section of the top edge of the third cover plate, a second rectangular notch is opened on the middle section of the top edge of the fourth cover plate, and the front and rear ends of the second rectangular convex edge are hingedly engaged in the second rectangular notch through a pair of second pins.

[0011] Preferably, two pairs of symmetrically distributed I-shaped rails are fixed on both sides of the top surface of the box cover, and the pair of I-shaped rails on the same side are distributed on the front and rear sides of the corresponding rectangular frame;

[0012] A pair of third pins are fixedly provided at the front and rear ends of the bottom edge of the fourth cover plate, and the outer end of each of the third pins is rotatably sleeved with a U-shaped slider, and each of the U-shaped sliders is slidably engaged on the I-shaped rail on the adjacent side.

[0013] Preferably, a U-shaped slide plate is slidably engaged in the middle of each I-shaped rail, a pair of fourth pins are fixedly provided at the front and rear ends of the bottom edge of the second cover plate, and the outer end of each fourth pin is rotatably inserted into one end of the corresponding U-shaped slide plate;

[0014] A pair of fifth pins are fixedly arranged at the front and rear ends of the bottom edge of the third cover plate, and the outer end of each of the fifth pins is rotatably inserted through the other end of the corresponding U-shaped slide plate.

[0015] Preferably, the outer end of each of the fourth pin shafts is sleeved with a concentrically fixed first linkage gear, the outer end of each of the fifth pin shafts is sleeved with a concentrically fixed second linkage gear, and adjacent first linkage gears are meshingly connected with second linkage gears.

[0016] Preferably, a pair of sixth pins are fixedly provided at the front and rear ends of the bottom edge of the first cover plate, the outer end of one of the sixth pins rotates through the corresponding trapezoidal plate and is sleeved with a concentrically fixed driven gear, and the outer end of the other sixth pin rotates through the corresponding trapezoidal plate and is fixed with a driven swing arm.

[0017] Preferably, a seventh pin is rotatably inserted at the top corner of the outer side surface of the trapezoidal plate, a concentrically fixed driving gear is sleeved on the middle part of the seventh pin, the driving gear is meshingly connected with the adjacent driven gear, an L-shaped swing arm is fixed on the outer end of the seventh pin, and one end of the L-shaped swing arm is movably hinged to the outer end of the driven swing arm through a hinged connecting rod.

[0018] Preferably, flat through holes are provided on the front and rear sides of the top surface of the box cover, and a pair of flat through holes are located on the outside of a pair of trapezoidal plates. A hydraulic telescopic cylinder is hingedly provided inside each of the flat through holes, and the end of the telescopic rod of each of the hydraulic telescopic cylinders is movably hinged to the other end of the L-shaped swing arm on the adjacent side.

[0019] The present invention also provides a method for using a ship hatch cover structure, comprising the following steps:

[0020] Step 1: Under the action of a pair of hydraulic telescopic cylinders, the ends of the telescopic rods of the pair of hydraulic telescopic cylinders are controlled to shorten, driving the L-shaped swing arm and the driving gear to rotate along the seventh pin shaft;

[0021] The driving gear meshes to drive the driven gear and the first cover plate to rotate upward along the sixth pin axis, and the L-shaped swing arm drives the driven swing arm and the first cover plate to rotate upward along the sixth pin axis through the hinged connecting rod, so that the pair of first cover plates swing in a closed state;

[0022] Step 2: Under the hinged action of the first cover plate and the second cover plate, the second cover plate and the first rectangular convex edge are driven to rotate along the first pin shaft, and the U-shaped slide plate is driven to slide inward along the I-shaped rail, so as to drive the second cover plate to fold toward the first cover plate;

[0023] Under the meshing action of the first linkage gear and the second linkage gear, the third cover plate is driven to fold toward the second cover plate;

[0024] Step 3: Under the hinged action of the third cover plate and the fourth cover plate, the fourth cover plate and the second rectangular convex edge are driven to rotate along the second pin shaft, and the U-shaped slider is driven to slide inward along the I-shaped rail, so as to drive the fourth cover plate to fold toward the third cover plate;

[0025] The first cover plate, the second cover plate, the third cover plate and the fourth cover plate are folded together in an "M" shape, and a pair of rectangular frames on the box cover are opened synchronously;

[0026] Step 4, controlling the ends of the telescopic rods of a pair of hydraulic telescopic cylinders to extend, thereby driving the first cover plate, the second cover plate, the third cover plate, and the fourth cover plate to fold and unfold in an "M" shape, and synchronously closing a pair of rectangular frames on the box cover.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. In the present invention, the "M"-shaped folding hatch cover has more advantages in opening and closing operations. Through a simple mechanical transmission mechanism, each cover can be unfolded or folded in the "M"-shaped folding order. Compared with some complex large hatch cover translation or flipping systems, the operation is more flexible, reducing the dependence on large lifting equipment, and the hatch opening and closing actions can be completed faster, thereby improving the ship operation efficiency;

[0029] 2. In the present invention, the "M"-shaped structural design enables the hatch cover to have better mechanical properties when subjected to external loads (such as stacking of goods, movement of personnel, impact of waves, etc.), and can distribute the load more evenly to each cover and supporting structure, and reduce local stress concentration through a reasonable force transmission path;

[0030] In summary, during the navigation of the ship, especially in severe sea conditions, the hatch cover of the present invention needs to remain stable, and the "M"-shaped folding design allows the covers to restrain and support each other to form a stable structural system; the cover is not easy to shift or loosen when subjected to lateral and longitudinal external forces, thereby ensuring the safety of the ship throughout the voyage. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 It is an exploded view of the overall structure of the present invention;

[0034] Figure 3 It is a schematic diagram of a pair of first cover plates structure of the present invention;

[0035] Figure 4 An exploded view of a pair of first cover plate structures of the present invention;

[0036] Figure 5 It is a schematic diagram of the structures of the first cover plate, the second cover plate, the third cover plate and the fourth cover plate of the present invention;

[0037] Figure 6 It is an exploded view of the first cover plate, the second cover plate, the third cover plate and the fourth cover plate structure of the present invention;

[0038] Serial numbers in the figure: 1. box cover; 2. rectangular frame; 3. I-shaped rail; 4. trapezoidal plate; 5. first cover plate; 6. second cover plate; 7. third cover plate; 8. fourth cover plate; 9. driven gear; 10. driven swing arm; 11. hydraulic telescopic cylinder; 12. driving gear; 13. L-shaped swing arm; 14. articulated connecting rod; 15. first linkage gear; 16. U-shaped slide plate; 17. second linkage gear; 18. U-shaped slide block. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0040] Embodiment 1: This embodiment provides a ship hatch cover structure, see Figure 1-6 Specifically, it comprises a box cover 1, a pair of symmetrically distributed rectangular through holes are opened on both sides of the top surface of the box cover 1, a pair of symmetrically distributed rectangular frames 2 are fixed on both sides of the top surface of the box cover 1, and each rectangular frame 2 is connected to the rectangular through hole on the adjacent side in a penetrating manner;

[0041] Specifically, a pair of staggered trapezoidal plates 4 are fixedly provided on the front and rear sides of the top surface of the box cover 1, and a pair of first cover plates 5 arranged upward in an "eight" shape are hingedly provided between the pair of trapezoidal plates 4, and the top edge of each first cover plate 5 is hingedly provided with a second cover plate 6 arranged downward in a "V" shape; the bottom edge of each second cover plate 6 is provided with a third cover plate 7 arranged upward in an "eight" shape, and the top edge of each third cover plate 7 is hingedly provided with a fourth cover plate 8 arranged downward in a "V" shape, and the first cover plate 5, the second cover plate 6, the third cover plate 7, and the fourth cover plate 8 located on the same side are arranged in an "M" shape.

[0042] It should be noted that: in the specific implementation process, if Figure 5 and Figure 6 As shown, a first rectangular notch is provided in the middle section of the top edge of the first cover plate 5, and a first rectangular convex edge is fixedly provided in the middle section of the top edge of the second cover plate 6. The front and rear ends of the first rectangular convex edge are hingedly engaged in the first rectangular notch through a pair of first pins. Under the hinged action of the first cover plate 5 and the second cover plate 6, the second cover plate 6 and the first rectangular convex edge are driven to rotate along the first pin.

[0043] A second rectangular convex edge is fixedly provided at the middle section of the top edge of the third cover plate 7, and a second rectangular notch is opened at the middle section of the top edge of the fourth cover plate 8. The front and rear ends of the second rectangular convex edge are hingedly engaged in the second rectangular notch through a pair of second pin shafts. Under the hinged action of the third cover plate 7 and the fourth cover plate 8, the fourth cover plate 8 and the second rectangular convex edge are driven to rotate along the second pin shaft.

[0044] During specific operations, as the ship is moving, the hull may be deformed to a certain extent due to factors such as wave impact and cargo loading. Due to its own structural characteristics, the "M"-shaped folding cover is more adaptable to such deformation than the rigidly connected integral hatch cover. The relative movement between adjacent covers can buffer the stress caused by hull deformation within a certain range, while maintaining the sealing effect, avoiding hatch seal failure and water leakage due to hull deformation.

[0045] Embodiment 2: Based on Embodiment 1, this embodiment further includes:

[0046] In the specific implementation process, Figure 5 and Figure 6 As shown, two pairs of symmetrically distributed I-shaped rails 3 are fixed on both sides of the top surface of the box cover 1, and the pair of I-shaped rails 3 located on the same side are distributed on the front and rear sides of the corresponding rectangular frame 2; a pair of third pins are fixed on the front and rear ends of the bottom edge of the fourth cover plate 8, and the outer end of each third pin is rotatably sleeved with a U-shaped slider 18, and each U-shaped slider 18 is slidably engaged on the I-shaped rail 3 on the adjacent side, and the U-shaped slider 18 slides inward along the I-shaped rail 3, driving the fourth cover plate 8 to fold toward the third cover plate 7;

[0047] A U-shaped slide plate 16 is slidably engaged in the middle of each I-shaped rail 3, and a pair of fourth pins are fixedly arranged at the front and rear ends of the bottom edge of the second cover plate 6. The outer end of each fourth pin is rotatably inserted through one end of the corresponding U-shaped slide plate 16, and the U-shaped slide plate 16 slides inwardly along the I-shaped rail 3, driving the second cover plate 6 to fold toward the first cover plate 5;

[0048] A pair of fifth pins are fixedly provided at the front and rear ends of the bottom edge of the third cover plate 7, and the outer end of each fifth pin is rotatably inserted through the other end of the corresponding U-shaped slide plate 16;

[0049] Specifically, the outer end of each fourth pin shaft is sleeved with a concentrically fixed first linkage gear 15, and the outer end of each fifth pin shaft is sleeved with a concentrically fixed second linkage gear 17, and the adjacent first linkage gears 15 are meshed and connected with the second linkage gears 17. Under the meshing action of the first linkage gears 15 and the second linkage gears 17, the third cover plate 7 is driven to be folded toward the second cover plate 6;

[0050] During the implementation of this work, when the "M"-shaped folding and unfolding design is opened, the cover can be neatly folded and stored in a specific area around the hatch. Compared with the traditional whole-piece sliding or rotating hatch cover, this folding method can more effectively utilize the limited space on the deck and reduce interference with other operating areas and equipment layouts of the ship.

[0051] Embodiment 3: Based on Embodiment 2, this embodiment further includes:

[0052] In the specific implementation process, Figure 3 and Figure 4As shown, a pair of sixth pins are fixedly provided at the front and rear ends of the bottom edge of the first cover plate 5, wherein the outer end of one of the sixth pins rotates through the corresponding trapezoidal plate 4 and is sleeved with a concentrically fixed driven gear 9, wherein the outer end of the other sixth pin rotates through the corresponding trapezoidal plate 4 and is fixedly provided with a driven swing arm 10; a seventh pin is rotatably inserted at the top corner of the outer side surface of the trapezoidal plate 4, and a concentrically fixed driving gear 12 is sleeved in the middle of the seventh pin, and the driving gear 12 is meshed and connected with the adjacent driven gear 9, and the meshing of the driving gear 12 drives the driven gear 9 and the first cover plate 5 to rotate along the sixth pin, and an L-shaped swing arm 13 is fixedly provided at the outer end of the seventh pin, and one end of the L-shaped swing arm 13 is movably hinged with the outer end of the driven swing arm 10 through a hinged connecting rod 14, and the L-shaped swing arm 13 drives the driven swing arm 10 and the first cover plate 5 to rotate along the sixth pin through the hinged connecting rod 14;

[0053] Flat through holes are provided on both sides of the top surface of the box cover 1, and a pair of the flat through holes are located outside the pair of trapezoidal plates 4. A hydraulic telescopic cylinder 11 is hingedly provided inside each of the flat through holes. The end of the telescopic rod of each hydraulic telescopic cylinder 11 is movably hinged with the other end of the L-shaped swing arm 13 on the adjacent side. The telescopic rod of the hydraulic telescopic cylinder 11 drives the L-shaped swing arm 13 and the driving gear 12 to rotate along the seventh pin shaft.

[0054] When the hatch cover is folded and unfolded in an "M" shape, a special sealing structure can be designed between adjacent covers and between the cover and the edge of the hatch; rubber sealing pads or other high-performance sealing materials can be used at the folding part of the "M" shape, and these sealing materials can better fit the cover connections at different angles; compared with traditional hatch covers, this design can effectively prevent the intrusion of rain, seawater and waves in severe sea conditions, and better protect the cargo and equipment in the cabin from water damage.

[0055] Specifically, the working principle and operation method of the present invention are as follows:

[0056] Step 1: Under the action of a pair of hydraulic telescopic cylinders 11, the ends of the telescopic rods of the pair of hydraulic telescopic cylinders 11 are controlled to shorten, driving the L-shaped swing arm 13 and the driving gear 12 to rotate along the seventh pin shaft;

[0057] The driving gear 12 meshes and drives the driven gear 9 and the first cover plate 5 to rotate upward along the sixth pin axis, and the L-shaped swing arm 13 drives the driven swing arm 10 and the first cover plate 5 to rotate upward along the sixth pin axis through the hinge connecting rod 14, so that the pair of first cover plates 5 swing in a closed state;

[0058] Step 2: Under the hinged action of the first cover plate 5 and the second cover plate 6, the second cover plate 6 and the first rectangular convex edge are driven to rotate along the first pin shaft, and the U-shaped slide plate 16 is driven to slide inward along the I-shaped rail 3, driving the second cover plate 6 to fold toward the first cover plate 5;

[0059] Under the meshing action of the first linkage gear 15 and the second linkage gear 17, the third cover plate 7 is driven to fold toward the second cover plate 6;

[0060] Step 3: Under the hinged action of the third cover plate 7 and the fourth cover plate 8, the fourth cover plate 8 and the second rectangular convex edge are driven to rotate along the second pin shaft, and the U-shaped slider 18 is driven to slide inward along the I-shaped rail 3, driving the fourth cover plate 8 to fold toward the third cover plate 7;

[0061] The first cover plate 5, the second cover plate 6, the third cover plate 7, and the fourth cover plate 8 are folded together in an "M" shape, and a pair of rectangular frames 2 on the box cover 1 are opened synchronously;

[0062] Step 4, controlling the ends of the telescopic rods of a pair of hydraulic telescopic cylinders 11 to extend, thereby driving the first cover plate 5, the second cover plate 6, the third cover plate 7, and the fourth cover plate 8 to unfold in an "M" shape, and synchronously closing a pair of rectangular frames 2 on the box cover 1.

[0063] During the navigation of the ship, especially in severe sea conditions, the hatch cover needs to remain stable, and the "M"-shaped folding design allows the covers to restrain and support each other to form a stable structural system; the covers are not easily displaced or loosened when subjected to lateral and longitudinal external forces, thereby ensuring the safety of the ship throughout the voyage.

[0064] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A ship hatch cover structure, comprising a hatch cover (1), characterized in that: A pair of symmetrically distributed rectangular through holes are provided on both sides of the top surface of the box cover (1); a pair of symmetrically distributed rectangular frames (2) are fixed on both sides of the top surface of the box cover (1); each of the rectangular frames (2) is connected to the rectangular through hole on the adjacent side in a penetrating manner; A pair of staggered trapezoidal plates (4) are fixedly provided on the front and rear sides of the top of the box cover (1); a pair of first cover plates (5) arranged upward in an "eight" shape are hingedly provided between the pair of trapezoidal plates (4); and a second cover plate (6) arranged downward in a "V" shape is hingedly provided on the top edge of each of the first cover plates (5); The bottom edge of each of the second cover plates (6) is provided with a third cover plate (7) arranged upward in an "eight" shape, and the top edge of each of the third cover plates (7) is hingedly provided with a fourth cover plate (8) arranged downward in a "V" shape, and the first cover plate (5), the second cover plate (6), the third cover plate (7), and the fourth cover plate (8) located on the same side are arranged in an "M" shape.

2. A ship hatch cover structure according to claim 1, characterized in that: A first rectangular notch is provided in the middle section of the top edge of the first cover plate (5), and a first rectangular convex edge is fixedly provided in the middle section of the top edge of the second cover plate (6). Front and rear ends of the first rectangular convex edge are hingedly engaged in the first rectangular notch via a pair of first pins.

3. A ship hatch cover structure according to claim 2, characterized in that: A second rectangular convex edge is fixedly provided at the middle section of the top edge of the third cover plate (7), a second rectangular notch is opened at the middle section of the top edge of the fourth cover plate (8), and front and rear ends of the second rectangular convex edge are hingedly engaged in the second rectangular notch via a pair of second pin shafts.

4. A ship hatch cover structure according to claim 3, characterized in that: Two pairs of symmetrically distributed I-shaped rails (3) are fixedly arranged on both sides of the top surface of the box cover (1); the pair of I-shaped rails (3) located on the same side are both distributed on the front and rear sides of the corresponding rectangular frame (2); A pair of third pins are fixedly provided at the front and rear ends of the bottom edge of the fourth cover plate (8), and a U-shaped slider (18) is rotatably sleeved on the outer end of each of the third pins, and each of the U-shaped sliders (18) is slidably engaged with the I-shaped rail (3) on the adjacent side.

5. A ship hatch cover structure according to claim 4, characterized in that: A U-shaped slide plate (16) is slidably engaged in the middle of each I-shaped rail (3), a pair of fourth pins are fixedly arranged at the front and rear ends of the bottom edge of the second cover plate (6), and the outer end of each fourth pin is rotatably inserted into one end of the corresponding U-shaped slide plate (16); A pair of fifth pins are fixedly provided at the front and rear ends of the bottom edge of the third cover plate (7), and the outer end of each fifth pin is rotatably inserted through the other end of the corresponding U-shaped slide plate (16).

6. A ship hatch cover structure according to claim 5, characterized in that: The outer end of each of the fourth pin shafts is sleeved with a concentrically fixed first linkage gear (15), the outer end of each of the fifth pin shafts is sleeved with a concentrically fixed second linkage gear (17), and adjacent first linkage gears (15) and second linkage gears (17) are meshed and connected.

7. A ship hatch cover structure according to claim 6, characterized in that: A pair of sixth pins are fixedly provided at the front and rear ends of the bottom edge of the first cover plate (5), the outer end of one of the sixth pins rotatably passes through the corresponding trapezoidal plate (4) and is sleeved with a concentrically fixed driven gear (9), and the outer end of the other sixth pin rotatably passes through the corresponding trapezoidal plate (4) and is fixedly provided with a driven swing arm (10).

8. A ship hatch cover structure according to claim 7, characterized in that: A seventh pin is rotatably inserted at the top corner of the outer side surface of the trapezoidal plate (4); a concentrically fixed driving gear (12) is sleeved in the middle of the seventh pin; the driving gear (12) is meshingly connected with an adjacent driven gear (9); an L-shaped swing arm (13) is fixedly provided at the outer end of the seventh pin; one end of the L-shaped swing arm (13) is movably hinged to the outer end of the driven swing arm (10) via a hinged connecting rod (14).

9. A ship hatch cover structure according to claim 8, characterized in that: The top surface of the box cover (1) is provided with flat through holes on both the front and rear sides, and a pair of the flat through holes are located outside a pair of trapezoidal plates (4). A hydraulic telescopic cylinder (11) is hingedly provided inside each of the flat through holes, and the end of the telescopic rod of each of the hydraulic telescopic cylinders (11) is movably hinged to the other end of the L-shaped swing arm (13) on the adjacent side.

10. The method for using a ship hatch cover structure according to claim 9, characterized in that: The following steps are involved: Step 1: Under the action of a pair of hydraulic telescopic cylinders (11), the ends of the telescopic rods of the pair of hydraulic telescopic cylinders (11) are controlled to shorten, thereby driving the L-shaped swing arm (13) and the driving gear (12) to rotate along the seventh pin shaft; The driving gear (12) meshes to drive the driven gear (9) and the first cover plate (5) to rotate upward along the sixth pin axis, and the L-shaped swing arm (13) drives the driven swing arm (10) and the first cover plate (5) to rotate upward along the sixth pin axis through the hinge connecting rod (14), so that the pair of first cover plates (5) swing in a closed state; Step 2: under the hinged action of the first cover plate (5) and the second cover plate (6), the second cover plate (6) and the first rectangular convex edge are driven to rotate along the first pin shaft, and the U-shaped slide plate (16) is driven to slide inward along the I-shaped rail (3), so as to drive the second cover plate (6) to fold toward the first cover plate (5); Under the meshing action of the first linkage gear (15) and the second linkage gear (17), the third cover plate (7) is driven to fold toward the second cover plate (6); Step 3: Under the hinged action of the third cover plate (7) and the fourth cover plate (8), the fourth cover plate (8) and the second rectangular convex edge are driven to rotate along the second pin shaft, and the U-shaped slider (18) is driven to slide inward along the I-shaped rail (3), so as to drive the fourth cover plate (8) to fold toward the third cover plate (7); The first cover plate (5), the second cover plate (6), the third cover plate (7), and the fourth cover plate (8) are folded together in an "M" shape, and a pair of rectangular frames (2) on the box cover (1) are opened synchronously; Step 4: Control the ends of the telescopic rods of a pair of hydraulic telescopic cylinders (11) to extend, thereby driving the first cover plate (5), the second cover plate (6), the third cover plate (7), and the fourth cover plate (8) to unfold in an "M"-shaped folding state, and synchronously close the pair of rectangular frames (2) on the box cover (1).

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