Operating system and operating method for gantry crane operating bulk goods

Abstract

The operation system comprises a transfer trolley, a lifting appliance, a portal crane and a plurality of bulk cargo boxes, the multiple bulk cargo boxes are arranged on the transfer trolley side by side, the bottoms of the bulk cargo boxes are open, and sealing plates are installed on the bottoms of the bulk cargo boxes in an openable and closable mode; the lifting appliance is installed on the portal crane and used for lifting a plurality of bulk cargo boxes on the transfer vehicle. The system and method for operating bulk cargoes through the portal crane have the beneficial effects that the shipping efficiency of bulk cargoes which cannot be directly grabbed through a grab bucket is improved, semi-automation is achieved, and operation is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of port operations, and in particular to an operation system and an operation method for gantry crane bulk cargo operations. Background Art

[0002] Currently, bulk cargo handling at ports primarily relies on gantry cranes equipped with specialized grab buckets. Typically, cargo is transported to the dock by port trucks, where it is dumped onto the dockside by the trucks, where it is then handled by grab buckets. During this operation, the cargo is easily broken by the grab buckets' gripping and squeezing, and by the loading and unloading equipment's crushing. Therefore, bulk cargoes such as fertilizers and grains cannot be handled using this method due to their fragility and potential contamination. Summary of the Invention

[0003] The present invention provides an operation system and an operation method for bulk cargo operation using a gantry crane, aiming to solve the problems in the prior art.

[0004] The technical solution of the present invention to solve the above technical problems is as follows:

[0005] A system for handling bulk cargo using a gantry crane comprises a transfer vehicle, a lifting device, a gantry crane and a plurality of bulk cargo containers, wherein the plurality of bulk cargo containers are placed side by side on the transfer vehicle, and their bottoms are open and closable and are provided with sealing plates; the lifting device is mounted on the gantry crane and is used for lifting the plurality of bulk cargo containers on the transfer vehicle.

[0006] The beneficial effects of the present invention are as follows: during the operation, a plurality of bulk cargo containers are pulled to a designated location for dock operations by using a transfer vehicle, and at the same time, a gantry crane uses a lifting device to sequentially lift the bulk cargo containers on the transfer vehicle to designated loading locations in the ship's hold, and then open the sealing plate at the bottom of the bulk cargo container, so that the cargo in the bulk cargo container is released to complete the loading operation;

[0007] After the bulk cargo is emptied, the gantry crane places the bulk cargo box on a flat position at the dock, and the bulk cargo box automatically closes the sealing plate at the bottom under the influence of its own gravity.

[0008] The present invention provides a system for loading bulk cargo using a gantry crane, aiming to improve the loading efficiency of bulk cargo that cannot be directly grabbed by a grab bucket, achieve semi-automation, and facilitate operation.

[0009] On the basis of the above technical solution, the present invention can also be improved as follows.

[0010] Furthermore, each of the sealing plates includes a pair of door panels, one end of which is rotatably connected to the two ends of the open ends of the bottom of the bulk container, and the other ends of which can be rotated to fit together to seal the bottom of the bulk container.

[0011] The beneficial effect of adopting the above further solution is that the structure is simple, the sealing plate adopts a split structure, and the pair of door panels are flipped to open or close the bottom of the bulk container, so as to realize the bulk cargo loading operation, which is convenient and efficient.

[0012] Furthermore, the plurality of bulk containers are rectangular boxes, and each pair of door panels are rectangular plate-shaped structures.

[0013] The beneficial effects of adopting the above further solution are simple structure, reasonable design of the shapes of the bulk cargo box and the door panel, and matching shapes of the bulk cargo box and the door panel, which facilitates the door panel to seal or open the bottom of the bulk cargo box.

[0014] Furthermore, hydraulic cylinders are installed opposite to each other at both ends of each bulk cargo box, and the telescopic ends of the two hydraulic cylinders are respectively rotatably connected to the corresponding pair of door panels, and the other ends are respectively rotatably connected to the two ends of the bulk cargo box.

[0015] The beneficial effects of adopting the above further solution are simple structure and reasonable design. During operation, two hydraulic cylinders are used to realize the flipping of the door panels to close or open the bottom of the bulk container, thereby facilitating the loading operation of bulk cargo.

[0016] Furthermore, the sling includes a fixed seat, which is suspended on the gantry crane through a cable; a plurality of twist lock assemblies are evenly installed on the edge of the fixed seat, and the plurality of twist lock assemblies are respectively used to fix the top edge of the bulk container.

[0017] The beneficial effect of adopting the above further solution is simple structure and reasonable design. During lifting, the fixing seat is attached to the top of the bulk container, and then multiple twist lock components are used to fix the edge of the top of the bulk container, thereby realizing the lifting of the bulk container.

[0018] Furthermore, the fixing seat is a frame-shaped structure.

[0019] The beneficial effects of adopting the above further solution are simple structure, reasonable shape design of the fixing seat, which matches the shape of the bulk container and is easy to lift.

[0020] Furthermore, the plurality of rotary lock assemblies respectively include a rotary pin and a rotary pin oil cylinder, wherein the rotary pin is vertically rotatably mounted on the edge of the fixed seat through a joint bearing; the rotary pin oil cylinder is horizontally mounted on the fixed seat, and its telescopic end is rotatably connected to the upper end of the rotary pin, and the end of the rotary pin oil cylinder is rotatably connected to the fixed seat, and is used to drive the rotary pin to rotate so that the lower end of the rotary pin is rotated into or out of the lock groove on the top of the bulk container.

[0021] The beneficial effects of adopting the above further solution are simple structure and reasonable design. During lifting, the fixing seat is attached to the top of the bulk container, and then the multiple rotating pins are rotated by the extension and contraction of the multiple rotating pin cylinders so that the fixing sleeves at the lower ends of the multiple rotating pins are inserted into or removed from the locking grooves at the top of the bulk container, thereby fixing or loosening the edge of the top of the bulk container, thereby realizing the lifting of the bulk container.

[0022] Furthermore, the plurality of rotary lock assemblies respectively include a push pin and a push pin limiter. The push pin is vertically mounted on the fixed seat and can be limitedly moved up and down. It is located next to the rotating pin, and a spring is sleeved on the push pin; the push pin limiter is fixedly mounted on the fixed seat, and the lower end of the spring abuts against the protrusion on the push pin, and the upper end thereof abuts against the push pin limiter; a controller is also included, and the door machine, the plurality of hydraulic cylinders and the plurality of push pin limits are respectively communicatively connected to the controller.

[0023] The beneficial effects of adopting the above-mentioned further scheme are simple structure and reasonable design. When the sling is placed on the top of the bulk cargo box, the bulk cargo box will push up multiple ejector pins so that the ejector pins move up to the set position. At this time, multiple ejector pin limiters receive signals and send them to the controller. The controller controls the multiple turn pin cylinders to operate synchronously to ensure that the multiple turn pins synchronously lock the bottom of the bulk cargo box. During the operation, the controller is used to control the operation of each component, which has a high degree of automation, convenient operation, and greatly improved operating efficiency.

[0024] The present invention also relates to an operating method of an operating system for bulk cargo handling using the above-mentioned gantry crane, comprising the following specific steps:

[0025] The transshipment vehicle pulls multiple bulk containers to the designated location for dock operations. At the same time, the gantry crane uses a sling to lift the bulk containers on the transshipment vehicle to the designated loading locations in the ship's hold in turn, and opens the sealing plate at the bottom of the bulk containers, allowing the cargo in the bulk containers to leak out and complete the loading operation.

[0026] The beneficial effect of adopting the above further solution is that the present invention provides a method for gantry crane operation of bulk cargo, aiming to improve the loading efficiency of bulk cargo that cannot be directly grabbed by a grab bucket, achieve semi-automation, and facilitate operation.

[0027] Furthermore, the method further comprises the following specific steps: after the bulk cargo is emptied, the gantry crane places the bulk cargo box on a flat position at the dock, and the bulk cargo box automatically closes the sealing plate at the bottom under the influence of its own gravity.

[0028] The beneficial effects of adopting the above further solution are simple method, reasonable design, and after bulk cargo loading is completed, the sealing plate at the bottom of the bulk container can be closed by the bulk container's own gravity, thereby saving energy consumption and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1It is the operation flow chart of the present invention;

[0030] Figure 2 Schematic diagram of the structure of the transfer vehicle and bulk cargo box in the present invention;

[0031] Figure 3 Schematic diagram of the three-dimensional structure of the bulk container in the present invention;

[0032] Figure 4 is a schematic plan view of a bulk container in the present invention;

[0033] Figure 5 It is a structural schematic diagram of a single twist lock assembly in the present invention.

[0034] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0035] 1. Reversing trolley; 2. Bulk container; 3. Door panel; 4. Draw rope; 5. Fixed seat; 6. Turn pin; 7. Turn pin cylinder; 8. Spherical bearing; 9. Ejector pin; 10. Ejector pin limiter; 11. Anti-fall safety pin; 12. Locking limiter; 13. Unlocking limiter. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0040] Example 1

[0041] like Figures 1 to 5 As shown, this embodiment provides an operation system for gantry crane operations of bulk cargo, including a transfer trolley 1, a hoist, a gantry crane and a plurality of bulk cargo boxes 2, wherein the plurality of bulk cargo boxes 2 are respectively placed side by side on the transfer trolley 1, and their bottoms are respectively open and closable and are respectively installed with sealing plates; the hoist is installed on the gantry crane and is used for lifting the plurality of bulk cargo boxes 2 on the transfer trolley 1.

[0042] During the operation, a plurality of bulk cargo containers 2 are pulled to the designated location of the dock operation by a transport truck 1. At the same time, a gantry crane uses a lifting device to sequentially lift the bulk cargo containers 2 on the transport truck 1 to the designated loading location in the ship's hold, and then opens the sealing plate at the bottom of the bulk cargo container 2, so that the cargo in the bulk cargo container 2 is released to complete the loading operation.

[0043] After the bulk cargo is emptied, the gantry crane places the bulk cargo box 2 on a flat position at the dock, and the bulk cargo box 2 automatically closes the sealing plate at the bottom under the influence of its own gravity.

[0044] This embodiment provides a system for gantry crane bulk cargo loading, aiming to improve the loading efficiency of bulk cargo that cannot be directly grabbed by a grab bucket, achieve semi-automation, and facilitate operation.

[0045] Example 2

[0046] Based on Example 1, in this embodiment, each of the sealing panels includes a pair of door panels 3, one end of which is rotatably connected to the two ends of the open ends of the bottom of the bulk container 2, and the other ends can be rotated to fit together to seal the bottom of the bulk container 2.

[0047] This solution has a simple structure, and the sealing plate adopts a split structure. The pair of door panels 3 are flipped to open or close the bottom of the bulk container 2, so as to realize the bulk cargo loading operation, which is convenient and efficient.

[0048] Example 3

[0049] On the basis of Example 2, in this embodiment, the plurality of bulk containers 2 are respectively rectangular boxes, and each pair of door panels 3 are respectively rectangular plate-shaped structures.

[0050] This solution has a simple structure, and the shapes of the bulk box 2 and the door panel 3 are reasonably designed. The shapes of the bulk box 2 and the door panel 3 match each other, making it easy for the door panel to seal or open the bottom of the bulk box.

[0051] Example 4

[0052] On the basis of any one of Examples 2 to 3, in this embodiment, hydraulic cylinders are relatively installed at both ends of each bulk container 2, and the telescopic ends of the two hydraulic cylinders are respectively rotatably connected to the corresponding pair of door panels 3, and the other ends are respectively rotatably connected to the two ends of the bulk container 2.

[0053] This solution has a simple structure and a reasonable design. During operation, two hydraulic cylinders are used to flip the pair of door panels 3 to close or open the bottom of the bulk container 2, thereby facilitating the loading of bulk cargo.

[0054] Example 5

[0055] Based on Example 4, in this embodiment, the sling includes a fixed seat 5, which is suspended on the gantry crane through a cable 4; a plurality of twist lock assemblies are evenly installed on the edge of the fixed seat 5, and the plurality of twist lock assemblies are respectively used to fix the top edge of the bulk container 2.

[0056] This solution has a simple structure and a reasonable design. During hoisting, the fixing seat 5 is fitted on the top of the bulk container 2, and then multiple twist lock assemblies are used to fix the edge of the top of the bulk container 2, thereby realizing the hoisting of the bulk container 2.

[0057] Example 6

[0058] On the basis of Example 5, in this embodiment, the fixing seat 5 is a frame-shaped structure.

[0059] This solution has a simple structure, and the shape of the fixing seat 5 is reasonably designed. Its shape matches the shape of the bulk container 2, making it easy to hoist.

[0060] Preferably, in this embodiment, a plurality of reinforcing rods are fixedly installed in the fixing base 5 at even intervals, and the plurality of reinforcing rods extend from one side of the fixing base 5 to the other side, and their two ends are fixedly connected to the two sides of the fixing base 5 respectively.

[0061] In addition, the number of the above-mentioned reinforcing rods is preferably two, and the two reinforcing rods are distributed side by side.

[0062] Preferably, in this embodiment, the number of the above-mentioned cables 4 is preferably four, the lower ends of the four cables 4 are respectively connected to the four corners of the fixing seat 5, and the upper ends thereof are respectively connected to the door machine.

[0063] Example 7

[0064] On the basis of any one of Examples 5 to 6, in this embodiment, the plurality of rotary lock assemblies respectively include a turn pin 6 and a turn pin cylinder 7, wherein the turn pin 6 is vertically rotatably mounted on the edge of the fixed seat 5 via a joint bearing 8; the turn pin cylinder 7 is horizontally mounted on the fixed seat 5, and its telescopic end is rotatably connected to the upper end of the turn pin 6, and the end of the turn pin cylinder 7 is rotatably connected to the fixed seat 5, and is used to drive the turn pin 6 to rotate so that the lower end of the turn pin 6 is screwed into or out of the lock groove at the top of the bulk container 2.

[0065] This solution has a simple structure and a reasonable design. During hoisting, the fixing seat 5 is attached to the top of the bulk container 2. Then, the multiple rotation pin cylinders 7 are extended and retracted to drive the multiple rotation pins 6 to rotate so that the fixing sleeves at the lower ends of the multiple rotation pins 6 are inserted into or removed from the locking grooves at the top of the bulk container 2, thereby fixing or releasing the edge of the top of the bulk container 2, thereby realizing the hoisting of the bulk container 2.

[0066] Preferably, in this embodiment, the number of the above-mentioned twist lock components is preferably four, and the four twist lock components are respectively distributed at the four corners of the fixing base 5.

[0067] Example 8

[0068] On the basis of Example 7, in this embodiment, the plurality of rotary lock assemblies further include a push pin 9 and a push pin limiter 10, respectively. The push pin 9 is vertically mounted on the fixed seat 5 and can be limitedly moved up and down. It is located next to the rotating pin 6, and a spring is sleeved on the push pin 9; the push pin limiter 10 is fixedly mounted on the fixed seat 5, and the lower end of the spring abuts against the protrusion on the push pin 9, and the upper end abuts against the push pin limiter 10; a controller is also included, and the door machine, the plurality of hydraulic cylinders and the plurality of push pin limits 10 are respectively communicatively connected to the controller.

[0069] This solution has a simple structure and a reasonable design. When the sling is placed on the top of the bulk container 2, the bulk container 2 will push up multiple push pins 9 so that the push pins 9 move up to the set position. At this time, multiple push pin limiters 10 receive a signal and send it to the controller. The controller controls the multiple rotation pin cylinders 7 to operate synchronously to ensure that the multiple rotation pins 6 synchronously lock the bottom of the bulk container 2. During the operation, the controller is used to control the operation of each component, which has a high degree of automation, convenient operation, and greatly improved operating efficiency.

[0070] Preferably, in this embodiment, each ejector pin 9 is assembled as follows: a through-hole is provided in the fixing seat 5 to mate with the ejector pin 9, a slide groove is vertically mounted on the side wall of the through-hole, and the ejector pin 9 is vertically mounted within the through-hole and can move up and down; an anti-fall safety pin 11 is fixedly mounted on the ejector pin 9. The anti-fall safety pin 11 is arranged perpendicular to the ejector pin 9, with one end fixedly connected to the ejector pin 9 and the other end extending into the slide groove and slidingly connected thereto. In this solution, the anti-fall safety pin 11 slides in engagement with the slide groove in the through-hole to prevent the ejector pin 9 from slipping.

[0071] Preferably, in this embodiment, each rotary lock assembly also includes a locking limit 12 and an unlocking limit 13, and the locking limit 12 and the unlocking limit 13 are fixedly installed on the fixed seat 5 at intervals, and are located next to the upper end of the corresponding turn pin 6. The locking limit 12 and the unlocking limit 13 are respectively communicated with the controller, and are respectively used to monitor the position of the turn pin cylinder 7 that drives the turn pin 6 to rotate by telescoping, and send the corresponding signal to the controller, and then the controller controls the operation of the turn pin cylinder 7 according to the received signal.

[0072] Example 9

[0073] Based on the above embodiments, this embodiment further provides an operating method for an operating system for bulk cargo handling using the above-mentioned gantry crane, comprising the following specific steps:

[0074] The inverting vehicle 1 pulls multiple bulk containers 2 to the designated location for dock operations. At the same time, the gantry crane uses a lifting device to lift the bulk containers 2 on the inverting vehicle 1 to the designated loading locations in the ship's hold in sequence, and opens the sealing plate at the bottom of the bulk containers 2, so that the cargo in the bulk containers 2 leaks out to complete the loading operation.

[0075] This embodiment provides a method for loading bulk cargo using a gantry crane, aiming to improve the loading efficiency of bulk cargo that cannot be directly grabbed by a grab bucket, achieve semi-automation, and facilitate operation.

[0076] Example 10

[0077] Based on Example 9, this embodiment further includes the following specific steps: after the bulk cargo is emptied, the gantry crane places the bulk cargo box 2 on a flat position at the dock, and the bulk cargo box 2 automatically closes the bottom sealing plate under the influence of its own gravity.

[0078] The method is simple and reasonably designed. After the bulk cargo is loaded onto the ship, the sealing plate at the bottom of the bulk cargo box 2 can be closed by the gravity of the bulk cargo box 2 itself, thereby saving energy consumption and reducing costs.

[0079] Based on the above solution, after the bulk cargo is emptied, the gantry crane places the bulk cargo box 2 on a flat position at the dock. The bulk cargo box 2 pushes the pair of door panels 3 back to their original positions under the influence of its own gravity, thereby pushing the hydraulic cylinder to retract.

[0080] The operating method of the bulk cargo handling system of a gantry crane provided by the present invention comprises the following specific steps:

[0081] During the operation, a plurality of bulk cargo containers 2 are pulled to the designated location of the dock operation by a transport truck 1. At the same time, a gantry crane uses a lifting device to sequentially lift the bulk cargo containers 2 on the transport truck 1 to the designated loading location in the ship's hold, and then opens the sealing plate at the bottom of the bulk cargo container 2, so that the cargo in the bulk cargo container 2 is released to complete the loading operation.

[0082] After the bulk cargo is emptied, the gantry crane places the bulk cargo box 2 on a flat position at the dock, and the bulk cargo box 2 automatically closes the sealing plate at the bottom under the influence of its own gravity.

[0083] It should be noted that all electronic components involved in the present invention adopt existing technologies, and the above components are electrically connected to the controller, and the control circuits between the controller and the components are existing technologies.

[0084] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0085] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A bulk cargo handling system for a gantry crane, characterized by: The invention comprises a transport truck (1), a lifting device, a gantry crane and a plurality of bulk cargo boxes (2). The plurality of bulk cargo boxes (2) are respectively placed side by side on the transport truck (1), and their bottoms are respectively open and closable and are respectively provided with sealing plates; the lifting device is installed on the gantry crane and is used for lifting the plurality of bulk cargo boxes (2) on the transport truck (1).

2. The bulk cargo handling system for a gantry crane according to claim 1, characterized in that: Each of the sealing plates comprises a pair of door panels (3), one end of the pair of door panels (3) being rotatably connected to the two ends of the corresponding open ends of the bottom of the bulk container (2), and the other ends thereof being rotatable to fit together to seal the bottom of the bulk container (2).

3. The bulk cargo handling system for a gantry crane according to claim 2, characterized in that: The plurality of bulk containers (2) are respectively rectangular box bodies, and each pair of door panels (3) are respectively rectangular plate-shaped structures.

4. The bulk cargo handling system for a gantry crane according to claim 2, characterized in that: Hydraulic cylinders are installed oppositely at both ends of each bulk container (2); the telescopic ends of the two hydraulic cylinders are respectively rotatably connected to a corresponding pair of door panels (3), and the other ends are respectively rotatably connected to both ends of the bulk container (2).

5. The bulk cargo handling system for a gantry crane according to claim 4, characterized in that: The sling comprises a fixed seat (5), and the fixed seat (5) is suspended on the door machine through a cable (4); a plurality of rotary lock assemblies are evenly spaced and installed on the edge of the fixed seat (5), and the plurality of rotary lock assemblies are respectively used to fix the top edge of the bulk container (2).

6. The bulk cargo handling system for a gantry crane according to claim 5, characterized in that: The fixing seat (5) is a frame-shaped structure.

7. The bulk cargo handling system for a gantry crane according to claim 5, characterized in that: The plurality of rotary lock assemblies respectively include a rotary pin (6) and a rotary pin oil cylinder (7), wherein the rotary pin (6) is vertically rotatably mounted on the edge of the fixed seat (5) via a joint bearing (8); the rotary pin oil cylinder (7) is horizontally mounted on the fixed seat (5), and its telescopic end is rotatably connected to the upper end of the rotary pin (6), and the end of the rotary pin oil cylinder (7) is rotatably connected to the fixed seat (5) for driving the rotary pin (6) to rotate so that the lower end of the rotary pin (6) is rotated into or out of the lock slot at the top of the bulk container (2).

8. The bulk cargo handling system for a gantry crane according to claim 7, characterized in that: The plurality of rotary lock assemblies further include a push pin (9) and a push pin limiter (10), respectively. The push pin (9) is vertically mounted on the fixed seat (5) and can be limitedly moved up and down. It is located next to the rotating pin (6), and a spring is sleeved on the push pin (9); the push pin limiter (10) is fixedly mounted on the fixed seat (5), the lower end of the spring abuts against the protrusion on the push pin (9), and the upper end thereof abuts against the push pin limiter (10); and a controller is further included, and the door machine, the plurality of hydraulic cylinders and the plurality of push pin limiters (10) are respectively connected to the controller for communication.

9. An operating method for a bulk cargo handling system using a gantry crane according to any one of claims 1 to 8, characterized in that: The specific steps include: The transshipping vehicle (1) pulls a plurality of bulk cargo containers (2) to a designated location for dock operations, and at the same time, the gantry crane utilizes a lifting device to sequentially lift the bulk cargo containers (2) on the transshipping vehicle (1) to designated loading locations in the ship's hold, and opens the sealing plate at the bottom of the bulk cargo container (2), so that the cargo in the bulk cargo container (2) leaks out to complete the loading operation.

10. The method for handling bulk cargo using a gantry crane according to claim 9, characterized in that: The following specific steps are also included: after the bulk cargo is emptied, the gantry crane places the bulk cargo box (2) on a flat position at the dock, and the bulk cargo box (2) automatically closes the sealing plate at its bottom under the influence of its own gravity.

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