A pusher rake device and a ship unloader

Abstract

The present invention relates to the technical field of ship unloading devices, and particularly relates to a pusher-rake device and a ship unloader. The pusher-rake device provided by the present invention is movably installed at the material taking end of the material taking device, and has a contracted state at a first preset angle A with the vertical plane and an extended state at a second preset angle B with the vertical plane, wherein A < B; thus, in the contracted state, the pusher-rake device can be retracted, facilitating the material taking device to extend into the interior of the cabin, and at the same time preventing interference with the normal operation of the material taking device; and in the extended state, the pusher-rake device can be spread out, facilitating the pusher-rake device to extend under the hatch coaming to scrape the materials under the hatch coaming, facilitating the material taking device to take the materials, thereby reducing the amount of materials to be cleared by using the material taking device for cabin cleaning and improving the overall efficiency of unloading.

Description

Technical Field

[0001] The present invention relates to the technical field of ship unloader devices, and particularly to a pushing and raking device and a ship unloader. Background Art

[0002] A ship unloader is an execution device for loading and unloading bulk materials. Continuous ship unloaders have a long application history in port bulk cargo ship unloaders. In particular, chain bucket ship unloaders have been applied within a certain range due to their good environmental protection performance and the ability to stably convey materials during unloading.

[0003] Generally, a fender is provided at the hatch of the cargo hold. However, since the rigid chain bucket arm cannot extend below the fender of the bulk carrier's hatch, it is difficult to unload the materials under the fender of the hatch, resulting in a large amount of cleaning work when using a chain bucket ship unloader, which seriously affects the overall efficiency. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect that it is difficult to unload the materials under the fender of the hatch in the prior art, so as to provide a pushing and raking device that can conveniently unload the materials under the fender of the hatch.

[0005] Another technical problem to be solved by the present invention is to overcome the defect that it is difficult to unload the materials under the fender of the hatch in the prior art, so as to provide a ship unloader that can conveniently unload the materials under the fender of the hatch.

[0006] To solve the above technical problems, the present invention provides a pushing and raking device, which is suitable for being movably installed at the material taking end of a material taking device; the pushing and raking device includes:

[0007] A structural rod, which is hingedly connected to the material taking device. The structural rod has a contracted state at a first preset angle A with the vertical plane and an expanded state at a second preset angle B with the vertical plane, where A < B;

[0008] At least one scraper, the plane of the scraper is arranged at an angle with the length direction of the structural rod, and the scraper is adapted to make a reciprocating circular motion around the structural rod when the structural rod is in the expanded state.

[0009] Optionally, the pushing and raking device further includes: a sprocket group, which is rotatably arranged on the structural rod;

[0010] A chain is wound around the sprocket group, and the scraper is arranged on the chain.

[0011] Optionally, the sprocket group includes a first inner sprocket and a second inner sprocket, and the first inner sprocket and the second inner sprocket are respectively rotatably arranged at both ends of the structural rod along the length direction;

[0012] The chain includes an inner chain, and the inner chain is disposed around the first inner sprocket and the second inner sprocket;

[0013] The first end of the scraper is hingedly connected to the inner chain via a first scraper hinge point.

[0014] Optionally, the sprocket set further includes a first outer sprocket and a second outer sprocket, the first outer sprocket and the second outer sprocket are rotatably disposed at two ends of the structural rod along the length direction, respectively, and the diameter of the first outer sprocket is larger than the diameter of the first inner sprocket, and the diameter of the second outer sprocket is larger than the diameter of the second inner sprocket;

[0015] The chain comprises an outer chain, and the outer chain is disposed around the first outer sprocket and the second outer sprocket;

[0016] The scraper is directly or indirectly connected to the outer chain at a preset position away from the first end.

[0017] Optionally, a hinge slide is provided on the outer chain, and a second scraper hinge is provided on the scraper, and the second scraper hinge is suitable for sliding cooperation with the hinge slide.

[0018] Optionally, the first outer sprocket and the first inner sprocket are coaxially arranged and rotate independently of each other;

[0019] The second outer sprocket and the second inner sprocket are coaxially arranged and rotate independently of each other.

[0020] Optionally, when the hinge point of the second scraper is located at the first position of the hinge point slideway, the scraper is in a working state;

[0021] When the hinge point of the second scraper is located at the second position of the hinge point slideway, the scraper is in an untrapped state;

[0022] Wherein, the first position is farther away from the inner chain than the second position.

[0023] Optionally, the push-rake device further comprises: a pitch drive unit, wherein the pitch drive unit is hingedly connected to the structural rod and is suitable for driving the structural rod to rotate.

[0024] The ship unloader provided by the present invention comprises:

[0025] Reclaiming device;

[0026] And a push-rake device as described above, which is arranged at the material taking end of the material taking device.

[0027] Optionally, a plurality of push-rake devices are arranged circumferentially around the material taking device.

[0028] The technical solution of the present invention has the following advantages:

[0029] 1. The pusher rake device provided by the present invention is movably installed at the material taking end of the material taking device, and has a contracted state at a first preset angle A with the vertical plane and an unfolded state at a second preset angle B with the vertical plane, where A < B. Thus, in the contracted state, the pusher rake device can be retracted to facilitate the material taking device to extend into the interior of the cabin, and at the same time prevent interference with the normal operation of the material taking device. And in the unfolded state, the pusher rake device is spread out to facilitate the pusher rake device to extend under the hatch coaming to scrape the materials under the hatch coaming, facilitating the material taking device to take materials, thereby reducing the amount of cleaning the cabin using the material taking device and improving the overall efficiency of unloading.

[0030] 2. The pusher rake device provided by the present invention drives the inner chain to rotate through the first inner sprocket and the second inner sprocket, and drives the outer chain to rotate through the first outer sprocket and the second outer sprocket. At the same time, since the first end of the scraper is hingedly connected to the inner chain through the first scraper hinge point, and a preset position of the scraper far from the first end is directly or indirectly connected to the outer chain, the scraper can make a reciprocating motion around the structural rod when the outer chain and the inner chain make synchronous rotation movements.

[0031] 3. The pusher rake device provided by the present invention is provided with a hinge point slideway on the outer chain, and the second scraper hinge point on the scraper can slide in the hinge point slideway, so that when the outer chain and the inner chain make asynchronous rotation, the scraper can make an angle adjustment, so that the pusher rake device can adjust the attitude of the scraper according to needs. When encountering the collapse of the bulk material pile or encountering great resistance, the scraper can be retracted to reduce the contact area between the scraper and the materials, facilitating the retraction and making it easy to get out of trouble.

[0032] 4. The ship unloader provided by the present invention is provided with a pusher rake device at the material taking end of the material taking device, so that in the contracted state, the pusher rake device can be retracted to facilitate the material taking device to extend into the interior of the cabin, and at the same time prevent interference with the normal operation of the material taking device. And in the unfolded state, the pusher rake device is spread out to facilitate the pusher rake device to extend under the hatch coaming to scrape the materials under the hatch coaming, facilitating the material taking device to take materials, thereby reducing the amount of cleaning the cabin using the material taking device and improving the overall efficiency of unloading. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 Schematic diagram of the working state of the ship unloader of the present invention;

[0035] Figure 2 Schematic diagram of the pusher-rake device of the present invention in the deployed state;

[0036] Figure 3 is Figure 2 Enlarged view at position B in

[0037] Figure 4 Schematic diagram of the pusher-rake device of the present invention in the retracted state;

[0038] Figure 5 is Figure 4 Enlarged view at position C in

[0039] Figure 6 is Figure 2 Schematic diagram of the A-A cross-section in

[0040] Description of reference numerals:

[0041] 12, main beam; 13, traveling trolley; 20, cabin; 30, material; 40, wharf foundation; 100, material taking device;

[0042] 700, pusher-rake device; 701, scraper; 702, first inner sprocket; 703, first outer sprocket; 704, first scraper hinge point; 705, hinge slideway; 706, second scraper hinge point; 707, inner chain; 708, outer chain; 709, pitching drive unit; 710, second inner sprocket; 711, second outer sprocket; 712, structural rod. Detailed implementation manners

[0043] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0044] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0045] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0047] Embodiment 1

[0048] Combined with Figures 1-6 As shown, the pusher-rake device provided in this embodiment, the pusher-rake device 700 is adapted to be movably installed at the material-taking end of the material-taking device 100; the pusher-rake device 700 includes:

[0049] A structural rod 712, which is hingedly connected to the material-taking device 100. The structural rod 712 has a contracted state at a first preset angle A with the vertical plane and an expanded state at a second preset angle B with the vertical plane, where A < B;

[0050] At least one scraper 701, the plane where the scraper 701 is located is arranged at an angle with the length direction of the structural rod 712, and the scraper 701 is adapted to make a reciprocating motion around the structural rod 712 when the structural rod 712 is in the expanded state.

[0051] Preferably, the pusher-rake device 700 is installed on the material-taking device 100 and is adapted to perform a lifting motion or a translation motion following the material-taking device 100. In the contracted state, the pusher-rake device 700 is placed against the housing of the material-taking device 100, which is convenient for the material-taking device 100 to extend into the interior of the cabin and at the same time prevents interference with the normal operation of the material-taking device 100; in the expanded state, the projection coverage area of the pusher-rake device 700 on the horizontal plane is larger than the projection coverage area of the material-taking device 100 on the horizontal plane, and the pusher-rake device 700 is installed at the material-taking end of the material-taking device 100, so that it can conveniently extend under the hatch coaming and rake the materials under the hatch coaming to a place where the material-taking device 100 can pick up, which is convenient for the material-taking device 100 to take materials.

[0052] The rake device provided in this embodiment is movably installed at the material taking end of the material taking device 100, and has a contracted state at a first preset angle A with the vertical plane and an expanded state at a second preset angle B with the vertical plane, where A < B. Thus, in the contracted state, the rake device 700 can be retracted, facilitating the material taking device 100 to extend into the interior of the cabin and preventing interference with the normal operation of the material taking device 100. And in the expanded state, the rake device 700 can be spread out, facilitating the rake device 700 to extend under the hatch coaming to scrape the materials under the hatch coaming, facilitating the material taking device 100 to take materials, thereby reducing the amount of cleaning the cabin using the material taking device 100 and improving the overall efficiency of unloading.

[0053] Preferably, the number of the scraping plates 701 is multiple, and the multiple scraping plates 701 all make reciprocating motions around the structural rod 712, thereby facilitating the scraping of the materials by the scraping plates 701. By adopting the reciprocating form, continuous scraping can be achieved to improve the working efficiency. And without relying on the movement of the material taking device 100, the materials can be scraped under the material taking device 100, facilitating material taking.

[0054] Specifically, the value range of the first preset angle A is 0° ≤ A < 45°.

[0055] Specifically, the value range of the second preset angle B is 45° ≤ B ≤ 135°.

[0056] Specifically, the value of the second preset angle B is B = 90°.

[0057] By controlling the first preset angle A and the second preset angle B, the structural rod 712 can be switched between the contracted state and the expanded state, and the projection coverage area of the rake device 700 on the horizontal plane can be adjusted.

[0058] Specifically, the rake device further includes: a sprocket group, and the sprocket group is rotatably arranged on the structural rod 712;

[0059] A chain is wound around the sprocket group, and the scraping plate 701 is arranged on the chain.

[0060] Preferably, the sprocket group is composed of at least two sprockets, and the at least two sprockets are distributed along the length direction of the structural rod 712. A chain is wound around the sprocket group, so that the sprocket group drives the chain to rotate and simultaneously drives the scraping plate 701 arranged on the chain to move, thereby realizing the scraping of the materials.

[0061] Specifically, the sprocket group includes a first inner sprocket 702 and a second inner sprocket 710, and the first inner sprocket 702 and the second inner sprocket 710 are respectively rotatably arranged at both ends of the structural rod 712 along the length direction;

[0062] The chain includes an inner chain 707 which is disposed around between the first inner sprocket 702 and the second inner sprocket 710;

[0063] The first end of the scraper 701 is hingedly connected to the inner chain 707 through a first scraper hinge point 704.

[0064] Specifically, the sprocket set further includes a first outer sprocket 703 and a second outer sprocket 711. The first outer sprocket 703 and the second outer sprocket 711 are respectively rotatably disposed at two ends of the structural rod 712 along the length direction, and the diameter of the first outer sprocket 703 is greater than the diameter of the first inner sprocket 702, and the diameter of the second outer sprocket 711 is greater than the diameter of the second inner sprocket 710;

[0065] The chain includes an outer chain 708 which is disposed around between the first outer sprocket 703 and the second outer sprocket 711;

[0066] A preset position of the scraper 701 away from the first end is directly or indirectly connected to the outer chain 708.

[0067] For the pushing and raking device provided in this embodiment, the first inner sprocket 702 and the second inner sprocket 710 drive the inner chain 707 to rotate, and the first outer sprocket 703 and the second outer sprocket 711 drive the outer chain 708 to rotate. At the same time, since the first end of the scraper 701 is hingedly connected to the inner chain 707 through the first scraper hinge point 704, and a preset position of the scraper 701 away from the first end is directly or indirectly connected to the outer chain 708, when the outer chain 708 and the inner chain 707 perform a synchronous rotation action, the scraper 701 can perform a reciprocating motion around the structural rod 712.

[0068] Specifically, a hinge point slideway 705 is provided on the outer chain 708, and a second scraper hinge point 706 is provided on the scraper 701. The second scraper hinge point 706 is adapted to be slidably matched with the hinge point slideway 705.

[0069] Preferably, a first scraper hinge point 704 is provided at the first end of the scraper 701, and a second scraper hinge point 706 is provided at a preset position of the scraper 701 away from the first end. Among them, the first scraper hinge point 704 is directly hingedly connected to the inner chain 707, and the second scraper hinge point 706 can slide in the hinge point slideway 705, so as to realize the indirect connection between the second scraper hinge point 706 and the outer chain 708.

[0070] Specifically, the first outer sprocket 703 and the first inner sprocket 702 are coaxially arranged and rotate independently of each other;

[0071] The second outer sprocket wheel 711 is coaxially arranged with the second inner sprocket wheel 710 and rotates independently of each other.

[0072] Preferably, the first outer sprocket wheel 703 and the first inner sprocket wheel 702 are driven differently, so that the first outer sprocket wheel 703 and the first inner sprocket wheel 702 can rotate independently of each other.

[0073] Preferably, the driving form of the pushing and raking device can adopt motor drive. Thus, in the harsh environment inside the bulk cargo hold, compared with the possible damage of the hydraulic drive components caused by slag entering the hydraulic cylinder, the motor can better ensure stable operation in this environment.

[0074] For the pushing and raking device provided in this embodiment, by arranging a hinge point slideway 705 on the outer chain 708 and enabling the second scraper hinge point 706 on the scraper 701 to slide within the hinge point slideway 705, when the outer chain 708 and the inner chain 707 rotate asynchronously, the scraper 701 can be adjusted in angle. Thus, the pushing and raking device can adjust the posture of the scraper 701 as needed. When encountering the collapse of the bulk material pile or a large resistance, the scraper 701 can be retracted, reducing the contact area between the scraper 701 and the material, facilitating the retraction and making it easy to get out of trouble.

[0075] Specifically, when the second scraper hinge point 706 is located at the first position of the hinge point slideway 705, the scraper 701 is in the working state;

[0076] When the second scraper hinge point 706 is located at the second position of the hinge point slideway 705, the scraper 701 is in the trouble-free state;

[0077] Wherein, the first position is farther from the inner chain 707 than the second position.

[0078] In one embodiment, when the second scraper hinge point 706 is located at the first position of the hinge point slideway 705, the included angle range between the scraper 701 on the upper and lower sides of the structural rod 712 and the structural rod 712 can be 45° to 90°. At this time, the scraper 701 is in the working state, facilitating the scraping of the material. On the other hand, when the second scraper hinge point 706 is located at the second position of the hinge point slideway 705, the included angle range between the scraper 701 on the upper and lower sides of the structural rod 712 and the structural rod 712 can be 0° to 30°. At this time, the scraper 701 is in the trouble-free state, reducing the contact area between the scraper 701 and the material, facilitating the retraction and making it easy to get out of trouble.

[0079] The following details the specific working process of the pushing and raking device provided in this embodiment:

[0080] When the material taking device 100 needs to unload the materials under the hatch coaming of the bulk cargo ship and the material taking device 100 cannot be extended under the hatch coaming, the pusher and rake device 700 provided in this embodiment can be used. First, the pusher and rake device 700 is in a retracted state and placed close to the cover of the material taking device 100, which facilitates the material taking device 100 to extend into the cabin and prevents interference with the normal operation of the material taking device 100; when the material taking device 100 is extended into the cabin, the structural rod 712 rotates from the retracted state to the extended state, and at this time, the scraper 701 is still in a state of being freed, so as to prevent the scraper 701 from being in a state of being freed. Figure 4 Taking the push-rake device 700 on the left side as an example, the inner chain 707 is slid clockwise for a certain distance relative to the outer chain 708. At this time, the inner chain 707 moves the first scraper hinge 704 clockwise, and the second scraper hinge 706 slides toward the center in the hinge slide 705. In this way, the scraper 701 is transformed from the escape state to the working state. When the structural rod 712 is laid flat and the scraper 701 is opened, the push-rake device starts to work. The sprocket drives the scraper 701 to do a counterclockwise circular motion, and the scraper pushes the material.

[0081] At this time, the scraper located above the structural rod 712 can push the material on the push-rake device down to prevent the push-rake device from being buried, and the scraper located below the structural rod 712 pushes the material toward the material reclaiming device. When the material is under the hatch coaming and needs to be scraped to the bottom of the hatch, the scraper can push the material under the hatch coaming to the bottom of the material reclaiming device.

[0082] When the scraper encounters a collapse of the bulk material pile or encounters great resistance during the scraping process, the inner chain 707 can continue to slide clockwise for a certain distance relative to the outer chain 708. At this time, the inner chain 707 moves the first scraper hinge 704 in the clockwise direction, and the second scraper hinge 706 slides to the bottom in the hinge slide 705. The angle between the scraper and the structural rod becomes smaller, so that the scraper can be folded up, which is convenient for withdrawal and easy to escape.

[0083] Specifically, the push-rake device further includes: a pitch drive unit 709 , which is hingedly connected to the structure rod 712 and is suitable for driving the structure rod 712 to rotate.

[0084] Preferably, the pitch drive unit 709 can be a motor, which is installed on the outer platform of the material taking device cover, and the end of the pitch drive unit 709 is connected to the structural rod of the push-rake device, thereby driving the structural rod to drive the push-rake device to pitch as a whole.

[0085] Embodiment 2

[0086] Combination Figure 1 As shown, this embodiment provides a ship unloader, comprising:

[0087] Material taking device 100;

[0088] And a pushing and raking device 700 as described in the first embodiment above, which is arranged at the material taking end of the material taking device 100.

[0089] For the ship unloader provided in this embodiment, by arranging the pushing and raking device 700 at the material taking end of the material taking device 100, the pushing and raking device 700 can be retracted in the retracted state, which is convenient for the material taking device 100 to extend into the interior of the ship's hold, and at the same time prevents interference with the normal operation of the material taking device 100; and in the deployed state, the pushing and raking device 700 is spread out, which is convenient for the pushing and raking device 700 to extend under the hatch coaming to rake the materials under the hatch coaming, facilitating the material taking device 100 to take materials, thereby reducing the amount of materials to be cleared from the hold when using the material taking device 100 for hold cleaning and improving the overall efficiency of unloading.

[0090] Optionally, the ship unloader is arranged on the quay foundation 40, and rails are arranged on the quay foundation 40. The ship unloader can move along the rails to drive the frame body of the ship unloader to move along the rails.

[0091] Optionally, the frame body 10 further includes a main beam 12; and a traveling trolley 13, the traveling trolley 13 is adapted to translate relative to the main beam 12; the material taking device 100 is driven by the traveling trolley 13, so that the material taking device 100 translates along the main beam 12. The traveling trolley 13 can drive the material taking device 100 to move above the ship's hold 20 to unload the materials 30 in the ship's hold 20. The material taking device 100 has a bucket chain 110 for digging materials.

[0092] Specifically, a plurality of pushing and raking devices 700 are arranged circumferentially around the material taking device 100.

[0093] Preferably, each pushing and raking device can be independently controlled and actuated. When it is necessary to clean the materials under the hatch coaming in a certain direction, the pushing and raking device in the corresponding direction extends, and the remaining pushing and raking devices continue to be in the retracted state.

[0094] Specifically, the pushing and raking devices 700 are respectively arranged on both sides of the material taking device 100 in the ship width direction;

[0095] And / or, the pushing and raking devices 700 are respectively arranged on both sides of the material taking device 100 in the ship length direction.

[0096] It should be noted that, as shown in Figure 1 The ship width direction refers to Figure 1 the left - right direction of the ship's hold 20, and the ship length direction refers to Figure 1 the direction perpendicular to the paper plane in

[0097] Preferably, on each of the four surfaces of the housing of the material taking device, a set of pushing and raking mechanisms is installed on each surface.

[0098] Obviously, the above embodiments are merely examples given for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or alterations derived therefrom are still within the protection scope of the present invention.

Claims

1. A push rake device, It is characterized in that The push-rake device (700) is suitable for being movably mounted on the material taking end of the material taking device (100); The push-rake device (700) comprises: A structural rod (712) is hingedly connected to the material taking device (100), and the structural rod (712) has a retracted state at a first preset angle A with the vertical plane, and an extended state at a second preset angle B with the vertical plane, wherein A<B; at least one scraper (701), wherein the plane where the scraper (701) is located is arranged at an angle with the length direction of the structural rod (712), and the scraper (701) is suitable for performing a cyclic reciprocating motion around the structural rod (712) when the structural rod (712) is in an unfolded state; A sprocket group, the sprocket group is rotatably arranged on the structural rod (712), a chain is arranged around the sprocket group, the scraper (701) is arranged on the chain, the chain includes an inner chain (707) and an outer chain (708), a first end of the scraper (701) is hingedly connected to the inner chain (707) via a first scraper hinge point (704), and a preset position of the scraper (701) away from the first end is directly or indirectly connected to the outer chain (708), The outer chain (708) is provided with a hinge slideway (705), the scraper (701) is provided with a second scraper hinge (706), and the second scraper hinge (706) is suitable for sliding cooperation with the hinge slideway (705). When the second scraper hinge point (706) is located at the first position of the hinge point slideway (705), the scraper (701) is in a working state; When the second scraper hinge point (706) is located at the second position of the hinge point slideway (705), the scraper (701) is in an untrapped state; Wherein, the first position is farther away from the inner chain (707) relative to the second position.

2. The push-rake device according to claim 1, It is characterized in that The sprocket set comprises a first inner sprocket (702) and a second inner sprocket (710), wherein the first inner sprocket (702) and the second inner sprocket (710) are rotatably disposed at two ends of the structural rod (712) along the length direction respectively; The inner chain (707) is disposed around the first inner sprocket (702) and the second inner sprocket (710).

3. The push-rake device according to claim 2, It is characterized in that The sprocket set further comprises a first outer sprocket (703) and a second outer sprocket (711), wherein the first outer sprocket (703) and the second outer sprocket (711) are rotatably disposed at two ends of the structural rod (712) along the length direction, respectively, and the diameter of the first outer sprocket (703) is greater than the diameter of the first inner sprocket (702), and the diameter of the second outer sprocket (711) is greater than the diameter of the second inner sprocket (710); The outer chain (708) is disposed around the first outer sprocket (703) and the second outer sprocket (711).

4. The push-rake device according to claim 3, It is characterized in that The first outer sprocket wheel (703) and the first inner sprocket wheel (702) are coaxially arranged and rotate independently of each other; The second outer sprocket wheel (711) and the second inner sprocket wheel (710) are coaxially arranged and rotate independently of each other.

5. The rake pushing device according to any one of claims 1-4, characterized in that the rake pushing device further comprises: a pitching drive unit (709), the pitching drive unit (709) is hingedly connected to the structural rod (712) and is adapted to drive the structural rod (712) to rotate.

6. A ship unloader, characterized in that it comprises: a material taking device (100); and a rake pushing device (700) according to any one of the above claims 1-5 provided at the material taking end of the material taking device (100).

7. The ship unloader according to claim 6, characterized in that a plurality of the rake pushing devices (700) are circumferentially arranged around the material taking device (100).

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