Method for hoisting and unshipping main engine of large ship
By designing a lifting point scheme and using flatbed trailers to assist in sharing the load, combined with the three-hook design of the gantry crane, the problem of insufficient lifting capacity during the hoisting of large ship main engines was solved, enabling the rotation and hoisting of the main engine and saving resources.
Patent Information
- Application Number
- CN202511395989.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-28
- Publication Date
- 2025-12-16
AI Technical Summary
In the existing technology, ship main engines whose weight exceeds the load capacity of the gantry crane hook cannot complete the aerial rotation during the lifting process. Especially in the shipbuilding process, the lifting capacity of conventional gantry cranes is insufficient and cannot meet the lifting requirements of large ship main engines.
By designing a lifting point scheme, utilizing a gantry crane with three hooks, and combining it with a flatbed trailer to assist in sharing part of the load and providing rotation functionality, the main engine of a large ship can be lifted. Specific steps include determining the lifting type and lifting point locations, and using the gantry crane and flatbed trailer in conjunction to complete the lifting and rotation of the main engine.
It enabled the hoisting and rotation of large ship main engines, saving money on offshore crane hoisting or other site transfers, and solved the problem of insufficient hoisting capacity by utilizing existing equipment.
Smart Images
Figure CN121134569A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of ship construction, in particular to a method for hoisting and unloading a large ship main engine. BACKGROUND
[0002] At present, the ship main engine is generally installed by a crane during loading and unloading. In the existing hoisting equipment of the shipyard, the main engine cannot be hoisted and rotated in the air during the hoisting stage if the weight of the main engine exceeds the load of the middle hook of the gantry crane. The main reasons are as follows:
[0003] 1. The gantry crane used for ship construction is generally in the form of upper and lower trolleys. The upper trolley is provided with a left hook and a right hook, and the lower trolley is provided with a middle hook, a total of three hook heads. The hook head with the largest single hook load is generally the middle hook.
[0004] 2. During hoisting of the main engine, three hook heads can be used to hoist simultaneously with locking. At this time, the hoisting capacity is higher than the single hook hoisting weight. However, if rotation in the air is required during hoisting, only one hook head can be used to realize rotation in the air during hoisting of the ship main engine by rotating the hook head.
[0005] 3. When the weight of the ship main engine exceeds the load of the middle hook, the main engine cannot be hoisted and rotated in the air during the hoisting stage.
[0006] Therefore, in view of these problems, a method for hoisting and unloading a large ship main engine is designed. The method is designed by designing the hoisting point scheme and using a flatbed trailer to assist in sharing part of the load and providing rotation function, which is of great significance to complete the hoisting and unloading of the large ship main engine. SUMMARY
[0007] In view of the above problems, the purpose of the present application is to provide a method for hoisting and unloading a large ship main engine by using a conventional standard gantry crane with three hooks, designing the hoisting point scheme, and using a flatbed trailer to assist in sharing part of the load and providing rotation function.
[0008] To achieve the above purpose, the technical scheme adopted by the present application is as follows: by designing the hoisting point scheme for the two orientations of the ship main engine and directly realizing the process connection design of the two schemes, and by researching the parameters and use methods of the flatbed trailer equipment, the implementation scheme of the cooperation between the hoisting machine and the flatbed trailer is determined, and a method for hoisting a ship main engine is realized.
[0009] The present application provides a method for hoisting and unloading a large ship main engine, which comprises the following steps:
[0010] Determine the hoisting type of the ship main engine, and determine the hoisting point position of the ship main engine corresponding to different hoisting types;
[0011] Based on the position of the main engine in the bow and stern direction relative to the main beam of the gantry crane when the transport ship arrives at the dock, determine the type of main engine hoisting to be used, use the gantry crane to lift the main engine off the transport ship, and place it on a flatbed trailer.
[0012] By operating the flatbed trailer and gantry crane, the weight of the ship's main engine is borne by the hook and the flatbed trailer;
[0013] Operate the flatbed trailer to position the ship's main engine in the required orientation;
[0014] The main engine was lifted again using a gantry crane with the appropriate type of lifting method, removed from the flatbed trailer, and stored on the main engine storage platform.
[0015] Furthermore, the method for determining the type of ship main engine hoisting is as follows:
[0016] When a transport ship is moored along the dock and the bow and stern of the main engine are parallel to the direction of the gantry crane's main beam, the main engine hoisting type is the transverse hoisting type.
[0017] When the main engine is perpendicular to the main beam of the gantry crane in the bow and stern direction, the main engine hoisting type of the ship is longitudinal hoisting.
[0018] Furthermore, when determining the lifting point location of the ship's main engine corresponding to different types of lifting operations,
[0019] When the hoisting type is horizontal hoisting, the left, middle and right hooks of the gantry crane are used for hoisting. The lifting points of the middle hook are symmetrically distributed in front of and behind the center of gravity of the main machine and in the left and right directions. At this time, the lifting points of the middle hook are used when the head and tail directions of the main machine are perpendicular to the main beam of the gantry crane. The left and right hooks of the gantry crane are distributed on both sides along the head and tail directions of the main machine.
[0020] When the hoisting type is longitudinal hoisting, the left and right hooks of the gantry crane are distributed at the beginning and end of the main unit, respectively, and the lifting points of the left and right hooks of the gantry crane are symmetrical with respect to the center of gravity of the main unit.
[0021] Furthermore, before operating the flatbed trailer to position the ship's main engine in the required orientation, the left and right hooks of the gantry crane need to be disconnected from the lifting wire ropes, while the middle hook lock remains in place.
[0022] Furthermore, the method of operating the flatbed trailer and gantry crane so that the weight of the ship's main engine is borne by the hook and flatbed trailer is as follows:
[0023] The flatbed trailer is used to lift the load, and the left and right hooks of the gantry crane are reduced to no load. The weight of the ship's main engine is borne by the middle hook and the flatbed trailer.
[0024] Furthermore, the method for maneuvering the flatbed trailer to position the ship's main engine in the required orientation is as follows:
[0025] Operate the flatbed trailer and rotate it in place to make the ship's main engine rotate horizontally and reach the required orientation.
[0026] Furthermore, when using a gantry crane again to lift the main engine of a ship using a suitable type of main engine lifting method,
[0027] The left and right hook wire ropes of the gantry crane were re-locked and connected to the main engine lifting point of the ship;
[0028] The gantry crane uses its center hook to lift and load the main engine, and its left and right hooks to lift and load the main engine, lifting it off the flatbed trailer and storing it on the main engine storage platform.
[0029] The advantages and positive effects of this invention are:
[0030] For the hoisting and unloading process of large ship main engines, it is necessary to rotate them in the air during the hoisting process to adjust the orientation of the main engine of the cargo ship. This invention addresses the problem of insufficient hoisting capacity of the gantry crane hook used for rotation. It utilizes existing equipment to complete the main engine rotation work, saving money on offshore hoisting or other site transfers. Attached Figure Description
[0031] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that these drawings are designed for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, unless specifically indicated, these drawings are intended only to conceptually illustrate the structural construction described herein and are not necessarily drawn to scale.
[0032] Figure 1 This is a schematic diagram of the ship's main engine lifting points provided in an embodiment of the present invention;
[0033] Figure 2 This is a schematic diagram of the hoisting of a ship's main engine via a lateral hoisting point, provided in an embodiment of the present invention.
[0034] Figure 3 A schematic diagram illustrating the simultaneous hoisting of the ship's main engine onto a flatbed trailer by the left, center, and right hooks after unloading, according to an embodiment of the present invention.
[0035] Figure 4 This is a schematic diagram of the left and right hook states of the lateral lifting point for dismantling a ship's main engine, provided in an embodiment of the present invention.
[0036] Figure 5 This is a schematic diagram showing the re-locking of the left and right hooks after the main unit has been hoisted and rotated, as provided in an embodiment of the present invention.
[0037] Figure 6This is a schematic diagram showing that after the main unit completes its rotation, the left and right hooks are reconnected to the longitudinal lifting points, the flatbed trailer is removed, and the main unit is simultaneously lifted by the left, middle, and right hooks of the gantry crane.
[0038] In the picture:
[0039] 1. Main engine of the ship 2. Hook lifting point
[0040] 3. Horizontal lifting point: left hook lifting point; 4. Horizontal lifting point: right hook lifting point
[0041] 5. Longitudinal lifting point: left hook lifting point; 6. Longitudinal lifting point: right hook lifting point.
[0042] 7. Gantry crane middle hook 8. Gantry crane left hook
[0043] 9. Right hook of gantry crane 10. Flatbed trailer
[0044] 11. Lifting wire rope. Detailed Implementation
[0045] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this invention. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this invention, and should not be construed as limiting the invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.
[0046] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0047] This embodiment provides a method for hoisting and unloading the main engine of a large ship, the method including the following steps:
[0048] Determine the type of ship main engine hoisting and the corresponding hoisting point location for the ship main engine for different hoisting types;
[0049] Based on the position of the main engine in the bow and stern direction relative to the main beam of the gantry crane when the transport ship arrives at the dock, determine the type of main engine hoisting to be used, use the gantry crane to lift the main engine off the transport ship, and place it on a flatbed trailer.
[0050] By operating the flatbed trailer and gantry crane, the weight of the ship's main engine is borne by the hook and the flatbed trailer;
[0051] Operate the flatbed trailer to position the ship's main engine in the required orientation;
[0052] The main engine was lifted again using a gantry crane with the appropriate type of lifting method, removed from the flatbed trailer, and stored on the main engine storage platform.
[0053] The method for determining the type of ship main engine hoisting is as follows:
[0054] When a transport ship is moored along the dock and the bow and stern of the main engine are parallel to the direction of the gantry crane's main beam, the main engine hoisting type is the transverse hoisting type.
[0055] When the main engine is perpendicular to the main beam of the gantry crane in the bow and stern direction, the main engine hoisting type of the ship is longitudinal hoisting.
[0056] When determining the lifting point location of the ship's main engine corresponding to different types of lifting operations,
[0057] When the hoisting type is horizontal hoisting, the left, middle and right hooks of the gantry crane are used for hoisting. The lifting points of the middle hook are symmetrically distributed in front of and behind the center of gravity of the main machine and in the left and right directions. At this time, the lifting points of the middle hook are used when the head and tail directions of the main machine are perpendicular to the main beam of the gantry crane. The left and right hooks of the gantry crane are distributed on both sides along the head and tail directions of the main machine.
[0058] When the hoisting type is longitudinal hoisting, the left and right hooks of the gantry crane are distributed at the beginning and end of the main unit, respectively, and the lifting points of the left and right hooks of the gantry crane are symmetrical with respect to the center of gravity of the main unit.
[0059] As an example, in this embodiment, when hoisting and unloading the main engine of a large ship, it is necessary to design the lateral and longitudinal hoisting points for the main engine. Using a flatbed trailer as an aid, and in conjunction with the design of the left, center, and right hook locking schemes for the gantry crane, a method for hoisting and unloading the main engine of a large ship is completed. The specific steps are as follows:
[0060] Step 1: When designing the lifting points for the gantry crane's left, center, and right hooks when the transport ship is docked along the pier and the main engine's bow and stern direction is parallel to the gantry crane's main beam, the lifting points are the transverse lifting points; when designing the main engine's bow and stern direction is perpendicular to the gantry crane's main beam, the lifting points are the longitudinal lifting points.
[0061] Step 2: When designing the lateral and longitudinal lifting points, consider that the gantry crane's center hook 7 is suitable for both lateral and longitudinal lifting point schemes; simultaneously, the gantry crane's center hook lifting points should be symmetrically arranged with respect to the ship's main engine's center of gravity in both the forward / backward and left / right directions; for example... Figure 1 As shown, the gantry crane has four sets of hook lifting points 2, which are symmetrical to the front and rear and left and right directions of the ship's main engine 1.
[0062] Step 3: After the transport ship carrying the main engine arrives at the dock and moors along the dock, the main engine's bow and stern direction should be parallel to the direction of the gantry crane's main beam. The gantry crane's left, center, and right hooks, using the lateral lifting points, will lift the main engine off the transport ship and slowly place it onto a flatbed trailer. Figure 2 , 3 As shown, the lifting points of the left hook 8 and the right hook 9 of the gantry crane on the main machine are distributed on both sides of the main machine in the direction of the front and rear, that is, on both sides of the width direction of the main machine. They are the left hook lifting point 3 and the right hook lifting point 4 for horizontal lifting, respectively.
[0063] Step 4: The flatbed trailer is lifted and loaded, and the left and right hooks of the gantry crane are reduced to no load. The weight of the ship's main engine is borne by the middle hook and the flatbed trailer 10. During this process, the load data of the gantry crane and the flatbed trailer are monitored in real time. This can be achieved by lifting and lowering the flatbed trailer or by raising and lowering the left and right hooks. At this time, the flatbed trailer bears part of the weight of the ship's main engine and is within the safe operating load range of the flatbed trailer. The ship's main engine is always supported by the gantry crane and is within the safe load range.
[0064] Step 5: Remove the left and right hook lifting wire clips 11, leaving only the middle hook with lock;
[0065] Step Six: Rotate the main unit horizontally using a flatbed trolley. During the rotation, the hook should be kept perpendicular to the center point of the plane formed by the lugs. If the hook deviates significantly from the center point, move the gantry crane along the overall track or move the hook trolley to keep the hook perpendicular to the center point of the plane formed by the lugs. The rotation process must be carried out smoothly.
[0066] Step 7: Re-lock the left and right hook lifting wire ropes and connect them to the longitudinal lifting points; as follows: Figure 6 As shown, the lifting points of the left hook 8 and the right hook 9 of the gantry crane on the main machine are distributed at both ends of the main machine, that is, on both sides of the length direction of the main machine, which are the longitudinal lifting point left hook lifting point 5 and the longitudinal lifting point right hook lifting point 6, respectively.
[0067] Step 8: The middle hook is lifted and loaded or not, and the left and right hooks are lifted and loaded. During the load increase process, the load on the middle hook is within the rated load, and the load on the flatbed trailer is gradually reduced to zero. At this time, the ship's main engine is completely lifted by the gantry crane. The main engine is lifted to the main engine storage platform by moving the gantry crane along the overall track or by moving the middle hook trolley.
[0068] One possible approach is to disconnect the left and right hooks of the gantry crane before operating the flatbed trailer to position the main engine in the desired orientation, while retaining the locking mechanism on the center hook. When using the gantry crane again to lift the main engine using a suitable lifting method, the left and right hooks of the gantry crane should be re-locked and connected to the lifting points of the main engine. The center hook of the gantry crane should then be used for lifting and loading, while the left and right hooks should also be used for lifting and loading, lifting the main engine off the flatbed trailer and storing it on the main engine storage platform.
[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A method for hoisting and unloading the main engine of a large ship, characterized in that, The method includes the following steps: Determine the type of ship main engine hoisting and the corresponding hoisting point location for the ship main engine for different hoisting types; Based on the position of the main engine in the bow and stern direction relative to the main beam of the gantry crane when the transport ship arrives at the dock, determine the type of main engine hoisting to be used, use the gantry crane to lift the main engine off the transport ship, and place it on a flatbed trailer. By operating the flatbed trailer and gantry crane, the weight of the ship's main engine is borne by the hook and the flatbed trailer; Operate the flatbed trailer to position the ship's main engine in the required orientation; The main engine was lifted again using a gantry crane with the appropriate type of lifting method, removed from the flatbed trailer, and stored on the main engine storage platform.
2. The method for hoisting and unloading a large ship's main engine according to claim 1, characterized in that, The method for determining the type of ship main engine hoisting is as follows: When a transport ship is moored along the dock and the bow and stern of the main engine are parallel to the direction of the gantry crane's main beam, the main engine hoisting type is the transverse hoisting type. When the main engine is perpendicular to the main beam of the gantry crane in the bow and stern direction, the main engine hoisting type of the ship is longitudinal hoisting.
3. The method for hoisting and unloading a large ship's main engine according to claim 2, characterized in that, When determining the lifting point location of the ship's main engine corresponding to different types of lifting operations, When the hoisting type is horizontal hoisting, the left, middle and right hooks of the gantry crane are used for hoisting. The lifting points of the middle hook are symmetrically distributed in front of and behind the center of gravity of the main machine and in the left and right directions. At this time, the lifting points of the middle hook are used when the head and tail directions of the main machine are perpendicular to the main beam of the gantry crane. The left and right hooks of the gantry crane are distributed on both sides along the head and tail directions of the main machine. When the hoisting type is longitudinal hoisting, the left and right hooks of the gantry crane are distributed at the beginning and end of the main unit, respectively, and the lifting points of the left and right hooks of the gantry crane are symmetrical with respect to the center of gravity of the main unit.
4. The method for hoisting and unloading a large ship's main engine according to claim 1, characterized in that, Before operating the flatbed trailer to position the ship's main engine in the required orientation, the left and right hooks of the gantry crane must be disconnected from the lifting wire ropes, while the middle hook lock remains in place.
5. The method for hoisting and unloading a large ship's main engine according to claim 1, characterized in that, The method for operating the flatbed trailer and gantry crane to allow the weight of the ship's main engine to be borne by the hook and flatbed trailer is as follows: The flatbed trailer is used to lift the load, and the left and right hooks of the gantry crane are reduced to no load. The weight of the ship's main engine is borne by the middle hook and the flatbed trailer.
6. The method for hoisting and unloading a large ship's main engine according to claim 1, characterized in that, The method for maneuvering a flatbed trailer to orient the ship's main engine as required is as follows: Operate the flatbed trailer and rotate it in place to make the ship's main engine rotate horizontally and reach the required orientation.
7. The method for hoisting and unloading a large ship's main engine according to claim 1, characterized in that, When using a gantry crane again to lift the main engine of a ship using a suitable type of main engine lifting method. The left and right hook wire ropes of the gantry crane were re-locked and connected to the main engine lifting point of the ship; The gantry crane uses its center hook to lift and load the main engine, and its left and right hooks to lift and load the main engine, lifting it off the flatbed trailer and storing it on the main engine storage platform.