Special cabin door for ship

Abstract

The cabin door special for the ship comprises a ship bow cabin, and the ship bow cabin comprises a bow door and a cabin opening cover; the bow door is installed at the foremost end of the ship bow cabin in a hinged mode, and the hatch cover is arranged at the top of the ship bow cabin in a sliding mode. The hatch cover comprises a cover plate, a side sliding mechanism and a stop device. Sliding rails are arranged on the two sides of the upper portion of the ship bow cabin. The side sliding mechanisms are installed on the two sides of the cover plate and used in cooperation with the sliding rails. The more than two cover plates are located on different horizontal planes and are connected through movable joints, and rollers are arranged between the cover plates; the stopping device is arranged on the upper surfaces of the cover plates and located between the two cover plates. The ship bow cabin door not only can meet the requirement that goods or other equipment enters from the front of the ship bow cabin, but also can meet the requirement that the goods or other equipment is hoisted from the top of the ship bow cabin, and objects needing to be transported enter and exit from the ship bow cabin conveniently.

Description

Technical Field

[0001] This invention relates to the field of marine equipment technology, and specifically to a special hatch for ships. Background Technology

[0002] Ferries, landing ships, and roll-on / roll-off ships typically have a bow door, which, when opened, allows the vessel to connect with a dock or land via a bow ramp. During navigation, the bow door must be completely closed to prevent seawater from entering the hull and ensure safe navigation. Hatch covers are sealing devices at the openings of cargo holds on the open deck of a ship, used to ensure the hull is watertight and the safety of cargo inside.

[0003] Some ship types have the bow door located directly forward, hinged to the hull at the bottom. When opened forward, it forms a plate-like structure, which can be raised or lowered via a remote control handle, allowing the roller end of the cover to contact the water surface parallel to the surface, or to be submerged. Above the interior cabins behind the bow door, a hatch cover is installed to facilitate other lifting operations; the bow door and hatch cover must be used in conjunction.

[0004] The hatch covers used on this type of vessel are folding type. Opening and closing the hatch covers is primarily achieved by using a winch reel connected to a shaft in the winch nacelle. The winch pulls the left and right side covers by simultaneously winding and unwinding steel cables. If the steel cable breaks or other reasons cause the hatch cover's sliding guide wheel to shift, the hatch cover will malfunction. Furthermore, the existing winch drive structure requires a dedicated winch nacelle next to the hull to house the dedicated winch system for driving the opening and closing of the hatch covers, as well as raising and lowering the bow door cover. Summary of the Invention

[0005] In view of the above analysis and existing problems, this invention develops a ship-specific hatch. By installing a bow door and hatch cover at the bow and top of the hull respectively, which cooperate with each other, it can simultaneously meet the needs of cargo entering the hatch horizontally through the bow door, or cargo being lifted into the hatch vertically from above the hatch cover by a crane. Operation and maintenance are convenient, and the bow door and hatch cover can be opened and closed from inside the bow compartment or the bridge, respectively. It also reduces the construction cost of ships with similar uses. The specific structure is as follows:

[0006] A ship-specific hatch includes a bow compartment, the bow compartment comprising...

[0007] Bow door and hatch cover;

[0008] The bow door is hinged and installed at the foremost end of the bow compartment, and the hatch cover is slidably mounted on the top of the bow compartment;

[0009] The hatch cover includes a cover plate, a side sliding mechanism, and a stop device; slide rails are provided on both sides above the bow compartment; the side sliding mechanism is installed on both sides of the cover plate and works in conjunction with the slide rails; the cover plate includes two or more pieces located on different horizontal planes and connected by movable joints, with rollers provided between the cover plates; the stop device is installed on the upper surface of the cover plate and located between two cover plates.

[0010] Furthermore, the cover plate includes a first hatch cover plate, a second hatch cover plate, a third hatch cover plate, and a fourth hatch cover plate; the first hatch cover plate is fixedly installed on the side near the hull; two sets of rollers are respectively installed at the front and rear ends of the second, third, and fourth hatch cover plates; guide rails are provided on the first, second, and third hatch cover plates to cooperate with the rollers, and the rollers can roll on the guide rails; three sets of slide rails are arranged in parallel, respectively cooperating with the side sliding mechanisms installed on both sides of the lower surface of the second, third, and fourth hatch cover plates; a side sliding mechanism is also provided below the stop device, which cooperates with the edges of the first, second, and third hatch cover plates.

[0011] Furthermore, it also includes a limiting mechanism; the limiting mechanism is respectively installed at the foremost end of the bow compartment and in front of the first hatch cover. When the fourth hatch cover is fully extended, the foremost end contacts the limiting mechanism at the foremost end of the bow compartment; when the fourth hatch cover is fully retracted, the rearmost end contacts the limiting mechanism in front of the first hatch cover.

[0012] Furthermore, it also includes a forward and reverse winch, which is installed at the end of the bow compartment opposite to the bow door, and includes a motor, a transmission mechanism, and a rope reel; the motor is connected to the rope reel through the transmission mechanism; rope grooves are provided on both sides above the bow compartment, and a pulley is provided at the front end of the rope groove; the rope reel includes a coaxial clockwise reel and a counterclockwise reel, the rope on the clockwise reel is wound clockwise and then passes through the rope groove, around the pulley at the front end of the rope groove, and is fixed to the side of the fourth hatch cover plate; the rope on the counterclockwise reel is wound counterclockwise and then fixed to the side of the fourth hatch cover plate through the rope groove, and the rope on the rope reel is connected to the fourth hatch cover plate by a wire rope orchid buckle.

[0013] Furthermore, the side sliding mechanism includes a mounting block, a mounting box, and an adjusting screw; the mounting box is disposed inside the mounting block, and the upper and lower surfaces of the mounting block have parallel oblong holes. A roller mounting rod is vertically inserted inside the mounting box, passing through the oblong holes on the mounting block, and the roller is mounted on the end of the roller mounting rod; a threaded hole is provided on the side of the mounting block, and a through hole is provided in the mounting box corresponding to the threaded hole position. The adjusting screw is movably connected to the through hole of the mounting box, passing through the through hole of the mounting box and connecting to the threaded hole on the mounting block; the axial direction of the adjusting screw is parallel to the oblong holes, and the position of the mounting box within the mounting block can be adjusted by rotating the adjusting screw.

[0014] Furthermore, it also includes a power mechanism, which is installed at the front end of the fourth hatch cover and includes a motor and a drive wheel; the upper sides of the bow compartment are provided with bosses, and the drive wheel contacts the bosses to drive the cover to move.

[0015] Furthermore, the bow door includes pulleys on both sides of the top of the door panel; rope grooves are provided on both sides above the bow compartment; a winch is provided at the end of the bow compartment opposite to the bow door, and the rope of the winch is slidably connected to the pulleys at the top of the bow door through the rope grooves, passes through the bow door from one pulley, passes through the pulley on the other side, and is fixed to the side of the bow compartment. The winch winds up and unwinds the rope to control the opening and closing of the bow door.

[0016] Furthermore, a roller conveyor belt is also installed on the bow door to transport objects entering the bow compartment from the front of the bow door. The power output is provided by a towing winch inside the compartment, which is connected to the object by a rope and runs on the roller conveyor belt, thereby transferring the object from the water surface to the compartment.

[0017] Furthermore, the roller conveyor belt comprises left and right parts, each of which is provided with a number of rollers, and the rollers in the left and right parts are inclined inward; and the rollers on the roller conveyor belt gradually shorten from the top to the bottom of the gate, gradually increase in height, and gradually increase in inclination.

[0018] Furthermore, the roller conveyor belt is also provided with transition rollers, which consist of three parts: left, middle, and right, and are intermittently arranged between the roller conveyor belts at the front end of the gate.

[0019] In use, the fourth hatch cover 9 is driven by the power mechanism 22 to run on the guide rail. The second cover stops running after reaching the guide rail locking joint. The third cover continues to slide on the guide rail and stops running after reaching the guide rail locking joint. The power mechanism 22 continues to slide to the end of the guide rail. After the limiting mechanism 10 contacts, the power is cut off, thereby stopping the drive pulley. During the hatch closing process, the side sliding mechanism 3 on both sides of the front end of each hatch adjusts the distance between the pulley and the bulkhead by adjusting the length of the adjusting bolts, so that the pulley contacts the bulkhead slide rail 5. The pulley in the auxiliary side sliding mechanism 3 slides inside the compartment, so that the hatch runs smoothly until the hatch cover 2 is completely closed.

[0020] The bow door 1 is opened and closed by a winch controlling the rope to be wound and released through the rope groove 24. When the bow door 1 is open, the front end is transported into the bow hold by the roller conveyor belt 25, and then the cargo in the bow hold is hoisted by the opening and closing of the hatch cover 2 on the top. The bow door roller can be immersed in water, and objects on the water surface or underwater are transported into the hold by a towing winch.

[0021] In addition, the fourth hatch cover 9 can also be opened and closed by rotating a winch. When the winch rotates clockwise, the rope on the clockwise disc 13 is released and the rope on the counterclockwise disc 14 is retracted, pulling the fourth hatch cover 9 back and opening the hatch cover 2. When the winch rotates clockwise and counterclockwise, the rope on the clockwise disc 13 is retracted and the rope on the counterclockwise disc 14 is released, pulling the fourth hatch cover 9 forward and closing the hatch cover 2.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The bow hatch is designed to accommodate both entry from the front of the bow and loading from the top of the bow, facilitating the movement of objects into and out of the bow.

[0024] The hatch cover on top of the bow compartment allows for convenient and quick opening; the control motor circuitry for the bow door and hatch cover is independently located in both the bow compartment and the bridge, allowing for independent operation of the bow door and hatch cover from two different positions, facilitating use and improving operational efficiency; the hatch cover can be opened or closed by the hatch cover drive winch rotating forward or in reverse; each hatch cover plate is equipped with a protective baffle at the top to effectively prevent damage from severe impacts; the hatch cover plates inside the compartment are equipped with adjustable guide wheels at both the top and bottom to prevent deformation of the hatch cover from causing it to slide unevenly on the guide rails; independent limit switches are set for both closing and opening the hatch cover to ensure that the hatch cover is opened or closed in the most effective position.

[0025] Both the bow door and hatch cover are equipped with dedicated limit devices to prevent equipment damage or personnel injury caused by loss of control during opening or closing.

[0026] An internal towing winch is installed. The connecting cable can pull objects from the water surface or underwater through the bow door rubber rollers to the bow door bracket, and then transfer them into the cabin through the intermediate transfer rollers. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the usage state of Embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the internal three-dimensional structure of Embodiment 1 of the present invention;

[0029] Figure 3 This is a front view of Embodiment 1 of the present invention;

[0030] Figure 4 for Figure 3 Enlarged view of part a in the middle;

[0031] Figure 5 This is a schematic diagram of the three-dimensional structure of the bow gate as described in Embodiment 1 of the present invention;

[0032] Figure 6 This is a schematic diagram of the hatch cover in use according to Embodiment 1 of the present invention;

[0033] Figure 7 This is a schematic diagram of the hatch cover and bow door opening / closing mechanism in Embodiment 1 of the present invention;

[0034] Figure 8 for Figure 3 Enlarged view of section b in the middle;

[0035] Figure 9 for Figure 3 Enlarged view of section c;

[0036] Figure 10 for Figure 3 Enlarged view of section d in the middle;

[0037] Figure 11 for Figure 3 Enlarged view of section e in the middle;

[0038] Figure 12 This is a schematic diagram of the internal three-dimensional structure of Embodiment 2 of the present invention;

[0039] Figure 13 for Figure 12 Enlarged view of part f in the middle;

[0040] Figure 14 for Figure 12 Enlarged view of part g in the middle;

[0041] Figure 15 This is a schematic diagram of the hatch cover opening and closing mechanism in Embodiment 2 of the present invention;

[0042] Figure 16This is a schematic diagram of the upper surface of the hatch cover in Embodiment 2 of the present invention;

[0043] Figure 17 This is a schematic diagram of the lower surface of the hatch cover in Embodiment 2 of the present invention;

[0044] Figure 18 for Figure 17 Enlarged view of the middle h section;

[0045] Figure 19 This is a side cross-sectional view of Embodiment 2 of the present invention;

[0046] Figure 20 This is a schematic diagram of the bow gate switch in Embodiment 2 of the present invention;

[0047] Figure 21 This is an exploded view of the side sliding mechanism structure described in an embodiment of the present invention;

[0048] In the picture:

[0049] 1—Bow door, 2—Hatch cover, 3—Side sliding mechanism, 4—Stop device, 5—Slide rail, 6—First hatch cover plate, 7—Second hatch cover plate, 8—Third hatch cover plate, 9—Fourth hatch cover plate, 10—Limiting mechanism, 11—Motor, 12—Transmission mechanism, 13—Clockwise disc, 14—Counterclockwise disc, 15—Mounting block, 16—Mounting box, 17—Adjusting screw, 18—Oval hole, 19—Roller mounting rod, 20—Threaded hole, 21—Through hole, 22—Power mechanism, 23—Boss, 24—Rope groove, 25—Roller conveyor belt, 26—Transition roller. Detailed Implementation

[0050] To make the technical means, inventive features, and objectives of this invention easier to understand, the technical solution of the invention will be further explained below with reference to two embodiments of a method for using a special ship hatch and its usage, as well as specific implementation methods:

[0051] Example 1: A ship-specific hatch includes a bow compartment, which includes a bow door 1 and a hatch cover 2;

[0052] The bow door 1 is hinged and installed at the foremost point of the bow compartment, while the hatch cover 2 is slidably mounted on the top of the bow compartment.

[0053] The hatch cover 2 includes a cover plate, a side sliding mechanism 3, a stop device 4, a limiting mechanism 10, and a power mechanism 22; slide rails 5 are provided on both sides above the bow compartment; the side sliding mechanism 3 is installed on both sides of the cover plate and works in conjunction with the slide rails 5; the cover plate includes four pieces located on different horizontal planes and connected by movable joints; the stop device 4 is installed on the upper surface of the cover plate and located between two cover plates. The cover plate includes a first hatch cover plate 6, a second hatch cover plate 7, a third hatch cover plate 8, and a fourth hatch cover plate 9; the first hatch cover plate 6 is fixedly installed on the side close to the hull, and two sets of rollers are installed at the front and rear ends of the cover plate, respectively. Guide rails are provided on the cover plate, and the rollers can roll on the guide rails; three sets of slide rails 5 are arranged in parallel and are used in conjunction with the side sliding mechanisms 3 installed on the second hatch cover plate 7, the third hatch cover plate 8, and the fourth hatch cover plate 9, respectively. The limiting mechanism 10 is respectively installed at the foremost end of the bow compartment and in front of the first hatch cover 6. When the fourth hatch cover 9 is fully extended, the foremost end contacts the limiting mechanism 10 at the foremost end of the bow compartment; when the fourth hatch cover 9 is fully retracted, the rearmost end contacts the limiting mechanism 10 in front of the first hatch cover 6.

[0054] The power mechanism 22 is installed at the front end of the fourth hatch cover 9 and includes a motor 11 and a drive wheel; there are bosses 23 on the upper sides of both sides of the bow compartment, and the drive wheel contacts the bosses 23 to drive the cover to move.

[0055] The side sliding mechanism 3 includes a mounting block 15, a mounting box 16, and an adjusting screw 17. The mounting box 16 is located inside the mounting block 15. The upper and lower surfaces of the mounting block 15 have parallel oblong holes 18. A roller mounting rod 19 is vertically inserted inside the mounting box 16. The roller mounting rod 19 passes through the oblong holes 18 on the mounting block 15, and the roller is mounted on the end of the roller mounting rod 19. The side of the mounting block 15 has a threaded hole 20. The mounting box 16 has a through hole 21 corresponding to the threaded hole 20. The adjusting screw 17 is movably connected to the through hole 21 of the mounting box 16. The adjusting screw 17 passes through the through hole 21 of the mounting box 16 and connects to the threaded hole 20 on the mounting block 15. The axis of the adjusting screw 17 is parallel to the oblong holes 18. By rotating the adjusting screw 17, the position of the mounting box 16 inside the mounting block 15 can be adjusted.

[0056] The bow door 1 includes pulleys on both sides of the top of the door panel; rope grooves 24 are provided on both sides above the bow compartment; a winch is provided at the end of the bow compartment opposite to the bow door 1, and the winch rope is slidably connected to the pulleys at the top of the bow door 1 through the rope grooves 24, passes through the pulley on one side of the bow door 1, passes through the pulley on the other side, and is fixed to the side of the bow compartment. The winch winds up and unwinds the rope to control the opening and closing of the bow door 1. A roller conveyor belt 25 is also provided on the bow door 1 to transport objects entering the bow compartment from the front end of the bow door 1. The roller conveyor belt 25 includes left and right parts, each with several rollers. The rollers in the left and right parts are inclined inward; and the rollers on the roller conveyor belt 25 gradually shorten, gradually increase in height, and gradually increase in inclination from the top to the bottom of the bow door 1. The roller conveyor belt 25 is also equipped with a transition roller 26, which consists of three parts: left, middle and right, and is intermittently arranged between the roller conveyor belts 25 at the front end of the gate 1.

[0057] In use, the fourth hatch cover 9 is driven by the power mechanism 22 to run on the guide rail. The second cover stops running after reaching the guide rail locking joint. The third cover continues to slide on the guide rail and stops running after reaching the guide rail locking joint. The power mechanism 22 continues to slide to the end of the guide rail. After the limiting mechanism 10 contacts, the power is cut off, thus stopping the drive pulley. During the hatch cover closing process, the side sliding mechanism 3 on both sides of the front end of each hatch cover adjusts the distance between the pulley and the bulkhead by adjusting the length of the adjusting bolts, so that the pulley contacts the bulkhead slide rail 5. The pulley in the auxiliary side sliding mechanism 3 slides inside the compartment, so that the hatch cover runs smoothly until the hatch cover 2 is completely closed. The bow door 1 is opened and closed by the winch controlling the rope to be wound and released through the rope groove 24. When the bow door 1 is open, the front end is transported into the bow hold by the roller conveyor belt 25, and then the cargo in the bow hold is hoisted by the opening and closing of the top hatch cover 2.

[0058] Example 2: The difference from Example 1 is that a power mechanism 22 is not provided; instead, a forward and reverse winch is used. The forward and reverse winch is installed at the end opposite to the bow hatch 1 in the bow compartment and includes a motor 11, a transmission mechanism 12, and a rope reel. The motor 11 is connected to the rope reel through the transmission mechanism 12. Rope grooves 24 are provided on both sides above the bow compartment, and a pulley is provided at the front end of the rope groove 24. The rope reel includes a coaxial clockwise reel 13 and a counterclockwise reel 14. The rope on the clockwise reel 13 is wound clockwise and then passes through the rope groove 24, around the pulley at the front end of the rope groove 24, and is fixed to the side of the fourth hatch cover 9. The rope on the counterclockwise reel 14 is wound counterclockwise and then fixed to the side of the fourth hatch cover 9 through the rope groove 24. The rope on the rope reel is connected to the fourth hatch cover 9 by a wire rope orchid buckle. When the winch rotates clockwise, the rope on the clockwise disc 13 is released, and the rope on the counterclockwise disc 14 is retracted, pulling the fourth hatch cover 9 to retract and opening the hatch cover 2; when the winch rotates clockwise and counterclockwise, the rope on the clockwise disc 13 is retracted, and the rope on the counterclockwise disc 14 is released, pulling the fourth hatch cover 9 to extend and closing the hatch cover 2.

[0059] The second distinguishing feature from Embodiment 1 is that a side sliding mechanism 3 is also provided below the stop device 4, which is used in conjunction with the edges of the first hatch cover 6, the second hatch cover 7 and the third hatch cover 8.

[0060] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of the invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the invention should be included within the protection scope of the invention. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A ship-specific hatch, including a bow compartment, characterized in that: The bow compartment includes Bow door (1) and hatch cover (2); The bow door (1) is hinged and installed at the foremost end of the bow compartment, and the hatch cover (2) is slidably disposed on the top of the bow compartment; The hatch cover (2) includes a cover plate, a side sliding mechanism (3) and a stop device (4); a slide rail (5) is provided on both sides above the bow compartment; the side sliding mechanism (3) is installed on both sides of the cover plate and works in conjunction with the slide rail (5); the cover plate includes two or more pieces located on different horizontal planes and connected by movable joints, with rollers provided between the cover plates; the stop device (4) is installed on the upper surface of the cover plate and located between the two cover plates.

2. A ship-specific hatch as described in claim 1, characterized in that: The cover plate includes a first hatch cover plate (6), a second hatch cover plate (7), a third hatch cover plate (8), and a fourth hatch cover plate (9); the first hatch cover plate (6) is fixedly installed on the side close to the hull, and two sets of rollers are respectively installed at the front and rear ends of the second hatch cover plate (7), the third hatch cover plate (8), and the fourth hatch cover plate (9). The first hatch cover plate (6), the second hatch cover plate (7), and the third hatch cover plate (8) are provided with guide rails that cooperate with the rollers, and the rollers can roll on the guide rails; three sets of slide rails (5) are arranged in parallel, which are used in conjunction with the side sliding mechanisms (3) installed on both sides of the lower plate surface of the second hatch cover plate (7), the third hatch cover plate (8), and the fourth hatch cover plate (9); a side sliding mechanism (3) is also provided below the stop device (4), which cooperates with the edges of the first hatch cover plate (6), the second hatch cover plate (7), and the third hatch cover plate (8).

3. A ship-specific hatch as described in claim 2, characterized in that: It also includes a limiting mechanism (10); the limiting mechanism (10) is respectively installed at the front end of the bow compartment and in front of the first hatch cover (6). When the fourth hatch cover (9) is fully extended, the front end contacts the limiting mechanism (10) at the front end of the bow compartment; when the fourth hatch cover (9) is fully retracted, the rear end contacts the limiting mechanism (10) in front of the first hatch cover (6).

4. A ship-specific hatch as described in claim 2, characterized in that: It also includes a forward and reverse winch, which is installed at the end opposite to the bow door (1) of the ship's bow compartment. The winch includes a motor (11), a transmission mechanism (12), and a rope reel. The motor (11) is connected to the rope reel through the transmission mechanism (12). Rope grooves (24) are provided on both sides above the bow compartment. A pulley is provided at the front end of the rope groove (24). The rope reel includes a coaxial clockwise reel (13) and a counterclockwise reel (14). The rope on the clockwise reel (13) is wound clockwise and then passes through the rope groove (24), around the pulley at the front end of the rope groove (24), and is fixed to the side of the fourth hatch cover (9). The rope on the counterclockwise reel (14) is wound counterclockwise and then fixed to the side of the fourth hatch cover (9) through the rope groove (24). The rope on the rope reel is connected to the fourth hatch cover (9) by a wire rope orchid buckle.

5. A ship-specific hatch as described in claim 1, characterized in that: The side sliding mechanism (3) includes a mounting block (15), a mounting box (16), and an adjusting screw (17); the mounting box (16) is disposed inside the mounting block (15), and the upper and lower surfaces of the mounting block (15) are provided with parallel oblong holes (18). A roller mounting rod (19) is vertically inserted inside the mounting box (16), and the roller mounting rod (19) passes through the oblong holes (18) on the mounting block (15). The roller is mounted on the end of the roller mounting rod (19); the side of the mounting block (15) is provided with a threaded hole. (20) The mounting box (16) has a through hole (21) at the position of the threaded hole (20). The adjusting screw (17) is movably connected to the through hole (21) of the mounting box (16). The adjusting screw (17) passes through the through hole (21) of the mounting box (16) and connects to the threaded hole (20) on the mounting block (15). The axial direction of the adjusting screw (17) is parallel to the waist-shaped hole (18). By rotating the adjusting screw (17), the position of the mounting box (16) in the mounting block (15) can be adjusted.

6. A ship-specific hatch as described in claim 2, characterized in that: It also includes a power mechanism (22), which is installed at the front end of the fourth hatch cover (9) and includes a motor (11) and a drive wheel; a boss (23) is provided on both sides above the bow compartment, and the drive wheel contacts the boss (23) to drive the cover to move.

7. A ship-specific hatch as described in claim 1, characterized in that: The bow door (1) includes pulleys on both sides of the top of the door panel; rope grooves (24) are provided on both sides above the bow compartment; a winch is provided at the end of the bow compartment opposite to the bow door (1), the rope of the winch is slidably connected to the pulley at the top of the bow door (1) through the rope groove (24), and passes through the pulley on one side of the bow door (1) and then passes through the pulley on the other side before being fixed to the side of the bow compartment. The winch winds up and unwinds the rope to control the opening and closing of the bow door (1).

8. A ship-specific hatch as described in claim 1 or 7, characterized in that: The bow door (1) is also equipped with a roller conveyor belt (25) for conveying objects that enter the bow compartment from the front end of the bow door (1).

9. A ship-specific hatch as described in claim 8, characterized in that: The roller conveyor belt (25) includes two parts, left and right, each with a number of rollers. The rollers in the left and right parts are inclined inward. The rollers on the roller conveyor belt (25) gradually shorten from the top to the bottom of the gate (1), gradually increase in height, and gradually increase in inclination.

10. A ship-specific hatch as described in claim 9, characterized in that: The roller conveyor belt (25) is also provided with a transition roller (26), which includes three parts: left, middle and right, and is intermittently arranged between the roller conveyor belt (25) at the front end of the gate (1).

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