Cover plate structure, ship unloader funnel and ship unloader

By using crank slider mechanism and winch traction assembly in the unloader to replace traditional screw drive, the problem of inconvenient arrangement of cover plate structure is solved, and space saving, cost reduction and service life extension are achieved.

CN222539959UActive Publication Date: 2025-02-28ZHEJIANG GUOHUA ZHENENG POWER GENERATION CO LTD
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Patent Information

Application Number
CN202323296644.3
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2023-12-04
Publication Date
2025-02-28
Estimated Expiration
2033-12-04

AI Technical Summary

Technical Problem

The screw structure of the drive cover plate in the existing ship unloader is not convenient to arrange, especially when the cover plate stroke is large, the screw length increases, takes up a large space and is costly.

Method used

Using a crank slide mechanism, the first cover plate and the second cover plate are driven by a winch and a traction assembly, and the combination of wire rope and pulley is used to realize the opening and closing operation of the cover plate, reducing the need for screws.

Benefits of technology

The space occupation and cost of the cover structure is reduced, while the layoutability and service life of the structure is improved. The crank slider mechanism is lightly worn during movement and has high load-bearing capacity.

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Abstract

The utility model relates to a cover plate structure, a ship unloader hopper and a ship unloader, the cover plate structure is used for covering a feeding port of the ship unloader hopper, and the cover plate structure comprises a first cover plate, a second cover plate, a winch and a traction assembly. The edge of the first cover plate is hinged to the edge of the feeding port. The edge of one side of the second cover plate is hinged to the first cover plate, and the edge of the other side of the second cover plate is slidably and rotatably connected with the edge of the feeding port, so that a slider-crank mechanism is formed among the first cover plate, the second cover plate and the feeding port. The winch is provided with a steel wire rope capable of being unfolded or wound. The traction assembly comprises a first pulley movably arranged in the horizontal direction, the steel wire rope bypasses the first pulley and is connected to the first cover plate, and the first pulley slides and pulls the steel wire rope and is used for driving the first cover plate to rotate in the second direction opposite to the first direction. By means of the technical scheme, the situation that in the prior art, screw transmission occupies more space and is difficult to arrange is not needed any more.
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Description

Technical Field

[0001] The present disclosure relates to the field of ship unloaders, and in particular to a cover plate structure, a ship unloader hopper and a ship unloader. Background Art

[0002] Ship unloaders are mostly used for cargo unloading operations at ports, and usually include a gantry, a hopper for receiving cargo, and a conveyor system. Usually, a cover structure is also required on the ship unloader. Take the ship unloader unloading loose granular materials such as coal or minerals as an example. After the unloading is completed, the cover structure needs to cover the feed port of the hopper to prevent rainwater from entering the hopper, because some materials will remain in the hopper. On rainy days, the materials remaining in the hopper will flow into other locations of the conveyor system with the rainwater, causing the conveyor system to malfunction. In the related art, the cover is usually driven by a screw drive so that the cover can cover the feed port of the hopper. When the stroke of the cover is larger, the screw required is longer, the cost is higher and it is inconvenient to arrange. Utility Model Content

[0003] The purpose of the present disclosure is to provide a cover plate structure, a ship unloader hopper and a ship unloader, so as to solve the problem that the screw structure for driving the cover plate in the related art is inconvenient to arrange.

[0004] The first object of the present disclosure is to provide a cover plate structure for covering a feed port of a ship unloader hopper, the cover plate structure comprising:

[0005] a first cover plate, wherein an edge of the first cover plate is hinged to an edge of the feed port;

[0006] a second cover plate, wherein one side edge of the second cover plate is hinged to the first cover plate, and the other side edge is slidably and rotatably connected to the edge of the feed port, so as to form a crank slider mechanism between the first cover plate, the second cover plate and the feed port;

[0007] a winch provided with a steel wire rope capable of being unrolled or wound, for driving the first cover plate to rotate in a first direction to open the feed port; and

[0008] The traction assembly includes a first pulley movably arranged in the horizontal direction, the steel wire rope passes around the first pulley and is connected to the first cover plate, the first pulley slides and pulls the steel wire rope to drive the first cover plate to rotate in a second direction opposite to the first direction to close the feed port.

[0009] Optionally, the cover structure also includes a crossbeam provided with a horizontally extending rack, and the traction assembly also includes a drive motor and a mounting seat, the mounting seat is provided with a gear that can mesh with the rack, the drive motor is arranged on the mounting seat and the output shaft of the drive motor is connected to the gear for driving the mounting seat to move, and the first pulley is arranged on the mounting seat.

[0010] Optionally, the traction assembly includes two horizontally extending mounting rods arranged on the crossbeam, the mounting rods are respectively arranged on both sides of the rack, and the mounting seat is slidably mounted on the mounting rods.

[0011] Optionally, limit plates are respectively provided at both ends of the mounting rod to prevent the mounting seat from being separated from the mounting rod.

[0012] Optionally, the mounting seat is provided with cleaning members extending toward the rack and the mounting rod respectively, and the cleaning members are used to clean the rack and the mounting rod when the mounting seat moves.

[0013] Optionally, the traction assembly further comprises a second pulley arranged on the crossbeam, the second pulley being arranged above the winch and arranged horizontally spaced apart from the first pulley, and the steel wire rope is connected to the first cover plate after passing around the second pulley and the first pulley in sequence.

[0014] Optionally, the second cover plate is provided with a third pulley for connecting to the edge of the feed port, and the edge of the feed port is provided with a guide rail capable of cooperating with the third pulley.

[0015] Optionally, the winch and the traction assembly are provided in plurality.

[0016] A second object of the present disclosure is to provide a ship unloader hopper, comprising a hopper body and a cover plate structure, wherein an upper port of the hopper body is formed as the feed port, wherein the cover plate structure is any one of the cover plate structures described above.

[0017] Optionally, the cover plate structure further includes a water collecting trough surrounding the feed port.

[0018] A third object of the present disclosure is to provide a ship unloader, comprising the ship unloader hopper described above.

[0019] Through the above technical solution, when the winch unfolds the wire rope and the first pulley drives the first cover plate to rotate in the first direction, the first cover plate and the second cover plate will cover the feed port of the ship unloader hopper. When the winch winds the wire rope, the wire rope will pull the first cover plate to open the feed port. When the stroke of the cover plate changes, the length of the wire rope and the moving distance of the first pulley can be adjusted, and the space occupied by the winch and the traction assembly remains unchanged. It is no longer necessary to increase the length of the screw itself as in the prior art because the increase in the stroke of the cover plate requires more space and is difficult to arrange. The foldable first cover plate and the second cover plate reduce the stroke of the cover plate and the stroke required for the first pulley, and the space occupied by the traction assembly is reduced and the cost is reduced. It is more convenient to arrange the cover plate structure and does not take up much space. At the same time, the crank slider mechanism is less worn during movement and has a high load-bearing capacity, which ensures the service life of the cover plate structure. Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0021] Figure 1 is a structural schematic diagram of a cover plate structure provided in an exemplary embodiment of the present disclosure;

[0022] Figure 2 is a schematic diagram of the use of the cover plate structure provided by an exemplary embodiment of the present disclosure;

[0023] Figure 3 is a schematic structural diagram of a feed port provided in an exemplary embodiment of the present disclosure;

[0024] Figure 4 is a schematic diagram of the use of a mounting base provided by an exemplary embodiment of the present disclosure;

[0025] Figure 5 is a schematic diagram of the use of a beam provided by an exemplary embodiment of the present disclosure;

[0026] Figure 6 yes Figure 1 Enlarged view of part A.

[0027] Description of Reference Numerals

[0028] 1-first cover plate, 2-second cover plate, 21-third pulley, 3-winch, 31-wire rope, 4-crossbeam, 41-rack, 5-traction assembly, 51-first pulley, 52-drive motor, 53-mounting seat, 531-gear, 54-mounting rod, 55-limiting plate, 56-second pulley, 6-guide rail, 7-feeding port, 8-water collecting trough. DETAILED DESCRIPTION

[0029] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0030] In the present disclosure, unless otherwise stated, the directional words used generally refer to the control box provided in the present disclosure under normal use. "Inside and outside" can refer to the inside and outside of the outline of the corresponding component or its location inside or outside the environment in which it is located, depending on the specific context. In addition, when the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The terms "first", "second", etc. used in the present disclosure are to distinguish one element from another and do not have order or importance.

[0031] like Figures 1 to 6 As shown, the first object of the present disclosure is to provide a cover plate structure for covering the feed port 7 of the ship unloader hopper, and the cover plate structure includes a first cover plate 1, a second cover plate 2, a winch 3 and a traction assembly 5. The edge of the first cover plate 1 is hinged to the edge of the feed port 7. One side edge of the second cover plate 2 is hinged to the first cover plate 1, and the other side edge is slidably and rotatably connected to the edge of the feed port 7 to form a crank slider mechanism between the first cover plate 1, the second cover plate 2 and the feed port 7. The winch 3 is provided with a steel wire rope 31 that can be unfolded or wound, which is used to drive the first cover plate 1 to rotate in a first direction to open the feed port 7. The traction assembly 5 includes a first pulley 51 movably arranged in the horizontal direction, the steel wire rope 31 passes around the first pulley 51 and is connected to the first cover plate 1, and the first pulley 51 slides and pulls the steel wire rope 31, which is used to drive the first cover plate 1 to rotate in a second direction opposite to the first direction to close the feed port 7.

[0032] Through the above technical solution, when the winch 3 unfolds the wire rope 31 and the first pulley 51 drives the first cover plate 1 to rotate in the first direction, the first cover plate 1 and the second cover plate 2 will cover the feed port 7 of the ship unloader hopper. When the winch 3 winds the wire rope 31, the wire rope 31 will pull the first cover plate 1 to open the feed port 7. When the stroke of the cover plate changes, the length of the wire rope 31 and the moving distance of the first pulley 51 can be adjusted, and the space occupied by the winch 3 and the traction assembly 5 remains unchanged. It is no longer necessary to increase the length of the screw itself as in the prior art because the increase in the stroke of the cover plate requires more space and is difficult to arrange. The foldable first cover plate 1 and the second cover plate 2 reduce the stroke of the cover plate and the stroke required for the first pulley 51. The space occupied by the traction assembly 5 is reduced and the cost is reduced, which makes it more convenient to arrange the cover plate structure and does not occupy much space. At the same time, the crank slider mechanism is less worn during movement and has a high load-bearing capacity, which ensures the service life of the cover plate structure.

[0033] It should be noted that, depending on the position of the first cover plate 1 and the feed port 7, the first direction can be clockwise or counterclockwise, and the second direction is opposite to the first direction. When the first direction is clockwise, the second direction is counterclockwise, and when the first direction is counterclockwise, the second direction is clockwise. The first cover plate 1 can rotate in the counterclockwise direction to cover the feed port 7, or it can rotate in the clockwise direction to cover the feed port 7. At the same time, the first pulley 51 needs to pull the wire rope 31 in the horizontal direction and the lower edge of the first cover plate 1 is hinged to the edge of the feed port 7, so the horizontal movement direction of the first pulley 51 needs to be perpendicular to the lower edge of the first cover plate 1 to ensure that the first cover plate 1 can rotate.

[0034] The following are Figure 1 and Figure 2 For example, Figure 1 and Figure 2 Taking the drawing direction as a reference, the usage process of the cover structure is introduced. Figure 1 When the cover plate structure is not covered on the feed port 7, the first cover plate 1 and the second cover plate 2 are in an upright state respectively. Figure 2 When the cover plate structure is covered on the feed inlet 7, the first cover plate 1 and the second cover plate 2 are respectively covered on the feed inlet 7. Figure 1 and Figure 2 In the embodiment, the feed port 7 is arranged on the right side of the first cover plate 1 and the second cover plate 2. At this time, the first direction is the clockwise direction, that is, the first cover plate 1 needs to be rotated in the clockwise direction to cover the feed port 7. Figure 1When the cover plate structure needs to be covered on the feed port 7, the winch 3 unfolds the steel wire rope 31, the length of the steel wire rope 31 becomes longer, and the first cover plate 1 can rotate toward the feed port 7. The first pulley 51 in the traction assembly 5 moves to the right in the horizontal direction to pull the steel wire rope 31, driving the first cover plate 1 to rotate clockwise. When the first cover plate 1 rotates clockwise, the upper edge of the first cover plate 1 will move to the right and downward at the same time. When moving to the right, the upper edge of the first cover plate 1 will push the second cover plate 2 that is slidably connected to the edge of the feed port 7, so that the second cover plate 2 also moves to the right. At the same time, when moving downward, the upper edge of the first cover plate 1 will drive the second cover plate 2 to rotate counterclockwise. When the steel wire rope 31 is unfolded to a certain extent and the first pulley 51 moves to the right a certain distance, the cover plate structure is Figure 1 The status in becomes Figure 2 In this state, the first cover plate 1 and the second cover plate 2 are covered on the feed port 7. Figure 2 When the cover plate does not need to be covered on the feed port 7, the winch 3 winds the wire rope 31, the length of the wire rope 31 is reduced, and the wire rope 31 pulls the first cover plate 1, driving the first cover plate 1 to rotate counterclockwise to move away from the feed port 7. The first pulley 51 in the traction assembly 5 moves horizontally to the left to pull the wire rope 31, and assists in driving the first cover plate 1 to rotate counterclockwise. When the first cover plate 1 rotates counterclockwise, the upper edge of the first cover plate 1 will move to the left and upward at the same time. When the upper edge of the first cover plate 1 moves to the left, it will drive the second cover plate 2 to move to the left as well. At the same time, when the upper edge of the first cover plate 1 moves upward, it will drive the second cover plate 2 to rotate clockwise. When the wire rope 31 is wound to a certain extent and the first pulley 51 moves a certain distance to the left, the cover plate structure is Figure 2 The status in becomes Figure 1 In this state, the first cover plate 1 and the second cover plate 2 are vertically arranged at the edge of the feed port 7. When the first cover plate 1 and the second cover plate 2 are vertically arranged at the edge of the feed port 7, they can also play a role of wind shielding to prevent some materials with relatively small particles from flying around under the action of wind.

[0035] In some embodiments, Figure 4As shown, the cover assembly may further include a crossbeam 4 provided with a horizontally extending rack 41, and the traction assembly 5 may further include a drive motor 52 and a mounting seat 53. The mounting seat 53 is provided with a gear 531 that can mesh with the rack 41. The drive motor 52 is disposed on the mounting seat 53 and the output shaft of the drive motor 52 is connected to the gear 531 for driving the mounting seat 53 to move. The first pulley 51 is disposed on the mounting seat 53. When the drive motor 52 is driven, the output shaft of the drive motor 52 also drives the gear 531 to rotate. Since the position of the rack 41 is fixed, the rotating gear 531 meshing with the rack 41 will drive the mounting seat 53 to move along the horizontal extension direction of the rack 41. The first pulley 51 is disposed on the mounting seat 53, and the mounting seat 53 drives the first pulley 51 so that the first pulley 51 can be movably disposed in the horizontal direction. Figure 1 and Figure 2 Taking the moving direction of the first pulley 51 as an example, by changing the rotation direction of the output shaft of the driving motor 52, it can be adjusted whether the first pulley 51 moves horizontally to the left or to the right. When the positions of the first cover plate 1 and the second cover plate 2 need to be fixed, the length of the wire rope 31 no longer changes, and the output shaft of the driving motor 52 can be locked to avoid rotation, so that the positions of the first cover plate 1 and the second cover plate 2 are fixed.

[0036] The cross beam 4 can be fixed on the portal seat of the ship unloader by a plurality of I-beams. The plurality of I-beams are arranged at intervals along the extension direction of the cross beam 4. The I-beams can ensure the contact area with the cross beam 4 and the portal seat respectively, thereby ensuring the fixing strength and stability of the cross beam 4.

[0037] The traction assembly 5 may include two horizontally extending mounting rods 54 disposed on the crossbeam 4. The mounting rods 54 are respectively disposed on both sides of the rack 41. The mounting seat 53 is slidably mounted on the mounting rods 54. Figure 4 and Figure 5 The mounting seat 53 can be slidably mounted on two mounting rods 54. The mounting seat 53 is installed below the rack 41 through the two mounting seats 53. The two mounting rods 54 can ensure the stability of the mounting seat 53 and also ensure the direction of the mounting seat 53 when moving.

[0038] Limiting plates 55 may also be provided at both ends of the mounting rod 54 to prevent the mounting seat 53 from being separated from the mounting rod 54. The limiting plates 55 can limit the moving distance of the mounting seat 53, prevent the mounting seat 53 and the first pulley 51 from falling, and avoid injuring the operator or the first cover plate 1 and the second cover plate 2.

[0039] The mounting seat 53 may be provided with cleaning members extending toward the rack 41 and the mounting rod 54, respectively, and the cleaning members are used to clean the rack 41 and the mounting rod 54 when the mounting seat 53 moves. The cover plate structure needs to be used in an external environment, and the ship unloader hopper will unload bulk granular materials such as coal or minerals, so that impurities in the external environment and some materials with smaller particles are easily attached to the rack 41 and the mounting rod 54. The particles attached to the rack 41 will affect the meshing of the gear 531 and the rack 41, and the particles attached to the mounting rod 54 will interfere with the movement of the mounting seat 53. The cleaning member here can be a brush detachably arranged on the mounting seat 53, and the elasticity of the brush bristles enables the bristles to cover more area, ensuring the use effect of the cleaning member.

[0040] In order to further avoid the influence of the external environment, the cross beam 4 can be formed with a storage space, and the gear 531, the rack 41 and the mounting rod 54 and other structures can be arranged in the storage space, and the cross beam 4 can play the role of shielding from wind and rain. The storage space formed by the cross beam 4 further avoids the interference of the external environment on the above structures.

[0041] The traction assembly 5 may also include a second pulley 56 disposed on the crossbeam 4, the second pulley 56 is disposed above the winch 3 and arranged horizontally with the first pulley 51, and the steel wire rope 31 passes through the second pulley 56 and the first pulley 51 in sequence and is connected to the first cover plate 1. The second pulley 56 is disposed above the winch 3, and the second pulley 56 can change the extension path of the steel wire rope 31. The second pulley 56 is disposed above the winch 3, so that the steel wire rope 31 extending from the winch 3 can first be vertically extended to the second pulley 56, and at the same time, because the second pulley 56 is arranged horizontally with the first pulley 51, the steel wire rope 31 extending to the second pulley 56 can be horizontally extended to the first pulley 51, and then vertically extended from the first pulley 51 to the first cover plate 1 and connected to the first cover plate 1. In this way, when the first cover plate 1 and the second cover plate 2 are covered on the feed port 7, the steel wire rope 31 will not occupy too much space above the feed port 7.

[0042] The edge of the second cover plate 2 for connecting to the feed port 7 may be provided with a third pulley 21, and the edge of the feed port 7 may be provided with a guide rail 6 capable of cooperating with the third pulley 21. Figure 1 and Figure 2 For reference, the third pulley 21 and the guide rail 6 can ensure the direction of the second cover plate 2 when moving to the left and to the right, and avoid the second cover plate 2 from getting stuck when moving. At the same time, the third pulley 21 and the guide rail 6 will not affect the rotation of the second cover plate 2.

[0043] There can be multiple winches 3 and traction assemblies 5. When there are two winches 3 and two traction assemblies 5, the two traction assemblies 5 and the two winches 3 can be arranged symmetrically. Multiple winches 3 and multiple traction assemblies 5 can drive the first cover plate 1 and the second cover plate 2 of larger size and heavier weight, so that the cover plate structure can be applied to the feed port 7 of larger size. At the same time, multiple winches 3 and multiple traction assemblies 5 also make the first cover plate 1 and the second cover plate 2 more stable and safer.

[0044] According to the second aspect of the present disclosure, a ship unloader funnel is also provided, including a funnel body and a cover structure, wherein the upper port of the funnel body is formed as a feed port 7, wherein the cover structure is the cover structure of any of the above-mentioned embodiments and has all its beneficial effects, which will not be repeated here.

[0045] The ship unloader hopper may also include a water collecting tank 8 surrounding the feed port 7. Figure 3 When it rains, rainwater will fall on the first cover plate 1 and the second cover plate 2 and will slide down from the first cover plate 1 and the second cover plate 2 to the water collecting tank 8, preventing the rainwater from flowing to other parts of the ship unloader. The water collecting tank 8 can be directly connected to the drainage system, so that the collected rainwater will be directly processed by the drainage system, avoiding the accumulation of rainwater in the water collecting tank 8.

[0046] According to a third aspect of the present disclosure, a ship unloader is also provided, comprising the above-mentioned ship unloader hopper and having all its beneficial effects, which will not be described in detail here.

[0047] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0048] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0049] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A cover plate structure, used to cover the feed port of a ship unloader hopper, characterized in that: The cover plate structure comprises: a first cover plate, wherein an edge of the first cover plate is hinged to an edge of the feed port; a second cover plate, wherein one side edge of the second cover plate is hinged to the first cover plate, and the other side edge is slidably and rotatably connected to the edge of the feed port, so as to form a crank slider mechanism between the first cover plate, the second cover plate and the feed port; a winch provided with a steel wire rope capable of being unrolled or wound, for driving the first cover plate to rotate in a first direction to open the feed port; and A traction assembly, comprising a first pulley movably arranged in a horizontal direction, the steel wire rope passing around the first pulley and connected to the first cover plate, the first pulley slidingly pulling the steel wire rope, and driving the first cover plate to rotate in a second direction opposite to the first direction, so as to close the feed port; The cover structure further comprises a crossbeam provided with a horizontally extending rack, the traction assembly further comprises a drive motor and a mounting seat, the mounting seat is provided with a gear that can mesh with the rack, the drive motor is arranged on the mounting seat and the output shaft of the drive motor is connected to the gear for driving the mounting seat to move, and the first pulley is arranged on the mounting seat; The traction assembly comprises two horizontally extending mounting rods arranged on the crossbeam, the mounting rods are respectively arranged on both sides of the rack, and the mounting seat is slidably sleeved on the mounting rods; The mounting seat is provided with a cleaning member extending toward the rack and the mounting rod respectively, and the cleaning member is used to clean the rack and the mounting rod when the mounting seat moves, and the cleaning member is a brush detachably provided on the mounting seat; The cross beam is formed with a receiving space, and the gear, the rack and the mounting rod are arranged in the receiving space.

2. The cover plate structure according to claim 1, characterized in that: Limiting plates are also provided at both ends of the mounting rod, respectively, for preventing the mounting seat from being separated from the mounting rod.

3. The cover plate structure according to claim 1, characterized in that: The traction assembly also includes a second pulley arranged on the crossbeam, the second pulley is arranged above the winch and is arranged horizontally with the first pulley, and the wire rope is connected to the first cover plate after passing around the second pulley and the first pulley in sequence.

4. The cover plate structure according to claim 1, characterized in that: The second cover plate is connected to the edge of the feed port and is provided with a third pulley, and the edge of the feed port is provided with a guide rail capable of cooperating with the third pulley.

5. The cover plate structure according to claim 1, characterized in that: The winch and the traction assembly are provided in plurality.

6. A ship unloader hopper, characterized in that: It comprises a funnel body and a cover plate structure, wherein the upper port of the funnel body is formed as a feed port, wherein the cover plate structure is the cover plate structure according to any one of claims 1-5.

7. The ship unloader hopper according to claim 6, characterized in that: The ship unloader hopper also includes a water collecting tank surrounded by the feed port.

8. A ship unloader, characterized in that: The invention comprises the ship unloader hopper as described in claim 6 or 7.