Tower body structure of marine grab bucket frequency conversion crane

Abstract

The invention discloses a tower body structure of a marine grab bucket variable frequency crane, and relates to the technical field of crane tower bodies, the tower body structure comprises a tower body main body, the tower body main body comprises an equal-diameter cylindrical shell, two sides of the cylindrical shell are respectively provided with a suspension arm root hinge point, and the cylindrical shell is hinged to a suspension arm structure through the suspension arm root hinge points; the cylindrical shell is obliquely and upwards cut to form an opening from the upper portion of a hinge point of the root of the corresponding suspension arm, a beveled side face is connected to the opening, and a tower arm gap is formed between the beveled side face and the suspension arm structure. In order to overcome the defects that an existing bent polyhedron and rolled conical shell tower body structure is complex in manufacturing process, low in internal space utilization rate and particularly waste in top space, the tower body structure achieves the effects that the manufacturing process is simple, the internal space utilization rate is high, and meanwhile it is ensured that movement of the suspension arm is free of interference.

Description

Technical Field

[0001] This invention relates to the field of crane tower technology, and in particular to a tower structure for a marine grab bucket variable frequency crane. Background Technology

[0002] For wire rope luffing cranes with jib hinge points on both sides of the tower, the upper part of the tower structure is typically narrower than the lower part to avoid interference between the jib and the inner structure of the jib box girder during lifting. The tower structures of marine cranes on the market mainly adopt two forms: one is a "polyhedral" structure (such as an octagonal prism) made by bending and welding flat plates; the other is a "frustum conical shell" structure made by rolling sheet metal. Both of these mainstream structures have inherent defects in practical applications: 1. Complex manufacturing process: The "polyhedral" structure requires precise bending of a large number of irregularly shaped plates, resulting in numerous and long weld seams, making it difficult to control welding deformation and incurring high costs for straightening and inspection. Although the "frustum conical shell" structure has fewer weld seams, the unfolding, blanking, and rolling of the conical plates require specialized equipment, and the taper causes each section to have different dimensions, resulting in low standardization and limited manufacturing efficiency. 2. Low internal space utilization: The "polyhedral" structure has multiple sharp corners and irregular spaces, which is not conducive to the layout of equipment such as winches and the laying of pipelines, resulting in a small effective usable area. Although the "conical shell" structure has no sharp corners inside, it is smaller at the top and larger at the bottom, while equipment usually needs to be placed at the bottom, and the top space cannot be effectively utilized. Therefore, it is necessary to design a new tower structure that is simple to manufacture, has high internal space utilization, ensures no movement interference with the boom, and takes into account excellent mechanical performance. Summary of the Invention

[0003] The purpose of this invention is to provide a tower structure for a marine grab bucket variable frequency crane. In view of the shortcomings of existing bent polyhedral and rolled conical shell tower structures, such as complex manufacturing processes and low internal space utilization (especially waste of top space), this invention provides a marine grab bucket variable frequency crane tower structure with simple manufacturing process, high internal space utilization, and ensures no interference in the movement of the boom.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A tower structure for a marine grab bucket variable frequency crane includes a tower body, the tower body including a cylindrical shell of equal diameter, with boom root hinge points on both sides of the cylindrical shell and hinged to the boom structure through the boom root hinge points; the cylindrical shell is cut obliquely upward from the upper part of the corresponding boom root hinge point, and obliquely cut side is connected at the opening, with a tower arm gap between the obliquely cut side and the boom structure.

[0005] Furthermore, the main body of the tower includes an internal circular platform within a cylindrical shell, which divides the interior of the cylindrical shell into an upper electrical room and a lower winch room.

[0006] Furthermore, the cylindrical housing is provided with a hinge reinforcement structure at the hinge point position at the root of the boom.

[0007] Furthermore, the inner side of the beveled side is provided with several reinforcing ribs.

[0008] Furthermore, the cylindrical shell and the obliquely cut side are divided into upper and lower parts that are fixed together.

[0009] Furthermore, the fixed positions between the upper and lower parts of the cylindrical shell and the oblique side are located at different heights.

[0010] Furthermore, the root hinge point of the boom is connected to a root hinge point support located on the outside of the cylindrical shell.

[0011] Furthermore, the upper end of the beveled side is connected to the top of the cylindrical shell, and the distance between the tops of the two beveled sides is 0.5 to 0.8 times the outer diameter of the cylindrical shell.

[0012] In summary, the present invention has the following beneficial effects: 1. Collaborative design to avoid interference and optimize space; Traditional "smaller at the top, larger at the bottom" designs avoid interference with the boom by reducing the overall size of the upper part; however, this invention adopts an innovative combination of a cylindrical shell of equal diameter and a beveled side plate; the beveled plane cuts upwards from the upper part of the boom hinge point, directly removing a part of the tower side wall that may interfere with the boom's lifting path, thus physically eliminating the risk of interference while keeping the main diameter of the tower constant (maximizing internal space).

[0013] 2. Core design for process simplification; The cylindrical shell of equal diameter can be formed in one step by rolling standard rectangular steel plates on a plate rolling machine with constant curvature. Only a few equal-diameter sections need to be rolled for the entire tower body, connected by circumferential welds. The material cutting, rolling, and assembly processes are extremely simple and highly standardized. Compared to conical shells, this invention eliminates the complex taper calculation and variable curvature rolling process, significantly reducing manufacturing difficulty and cost. Compared to polyhedral structures, it eliminates a large number of long straight welds and bending processes, resulting in less welding deformation and easier precision control. 3. Core design for efficient space utilization; The uniform-diameter cylindrical shell provides a constant, regular, and seamless circular internal space from bottom to top (below the initial beveled surface). This allows for the flexible arrangement of multiple rotating mechanisms along the cylinder wall in the lower winch room, reserving more space for the central winch. The upper electrical room has complete space for electrical cabinets. Although the space above the beveled portion of the side walls has been removed, the structure's front and rear are cylindrical shells, ensuring 100% effective utilization of the lower main space. The overall space utilization rate is far higher than that of a truncated cone design that is overall narrowed to avoid obstruction. The horizontal annular platform enables a vertically layered and compact arrangement of electrical and mechanical equipment, with clear logic and smooth pipeline laying. 4. Structural integration and optimization; The root hinge support is directly installed on the outer wall of the cylindrical shell. Inside this area, there is a box-shaped reinforcement structure integrated with the cylinder wall and the annular platform. The cylindrical shell is locally thickened in high-stress areas (such as the hinge area and the bottom of the tower). The front and rear directions are circular. Compared with the polyhedral form, the wind load coefficient is reduced, thus reducing the wind load in the front and rear directions. Attached Figure Description

[0014] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of the tower body of a marine grab bucket variable frequency crane according to the present invention; Figure 2 This is a schematic diagram of the structure of the tower body and the boom structure of a marine grab bucket variable frequency crane according to the present invention. Figure 3 This is a schematic diagram of the internal structure of the tower structure of a marine grab bucket variable frequency crane according to the present invention.

[0016] In the diagram, 1. Cylindrical shell; 11. Root hinge point of the boom; 12. Oblique side; 13. Hinge point reinforcement structure; 2. Boom structure; 21. Root hinge point support; 22. Tower boom gap; 3. Internal circular platform; 31. Upper electrical room; 32. Lower winch room. Detailed Implementation

[0017] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. These embodiments do not constitute a limitation of the present invention. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this application.

[0018] A tower structure for a marine grab bucket variable frequency crane, such as Figure 1 and Figure 2 As shown, the tower body includes a main body, which includes a cylindrical shell 1 of equal diameter. The cylindrical shell 1 has two hinge points 11 at the base of the boom on both sides, and is hinged to the boom structure 2 through the hinge points 11. The cylindrical shell 1 is cut obliquely upward from the top of the hinge point 11 to its top to form an opening (in this embodiment, the upper end of the oblique side 12 is connected to the top of the cylindrical shell 1, and the distance between the tops of the two oblique side 12 is 0.5 to 0.8 times the outer diameter of the cylindrical shell 1). The oblique side 12 (which can be set as a straight side or a streamlined shape) is welded and fixed at the opening. A tower arm gap 22 is left between the oblique side 12 and the boom structure 2. It adopts an innovative combination of a cylindrical shell 1 of equal diameter and a beveled side plate. The beveled plane cuts upward from the upper part of the boom hinge point, directly removing part of the tower side wall that may interfere with the boom's lifting path. Thus, while keeping the main diameter of the tower body constant (maximizing the internal space), the risk of interference is physically eliminated.

[0019] like Figure 1 and Figure 2 As shown, the thickness of the cylindrical shell 1 is designed with a gradient according to the stress, and is locally thickened in high stress areas (such as the hinge area and the bottom of the tower body), and several vertical reinforcing ribs are welded on the inner side of the oblique side 12; in this embodiment, the root hinge point 11 of the boom is directly connected to the root hinge point support 21 located on the outside of the cylindrical shell 1, and a box-shaped hinge point reinforcement structure 13 integrated with the cylindrical shell 1 is correspondingly provided in the area (the position of the root hinge point 11 of the boom).

[0020] like Figure 3 As shown, the main body of the tower includes an internal circular platform 3 (a horizontal annular platform, in this embodiment, welded to the plane of the fixed oblique side 12) welded inside a cylindrical shell 1. The upper end of the hinge point reinforcement structure 13 can be connected to the internal circular platform 3 to further improve the strength. The internal circular platform 3 divides the interior of the cylindrical shell 1 into an upper electrical room 31 and a lower winch room 32. The cylindrical shell 1 of the same diameter provides a constant, regular, and dead-angle-free circular internal space from bottom to top (below the oblique starting surface), which allows multiple rotating mechanisms to be flexibly arranged along the cylinder wall in the lower winch room 32, reserving more space for the middle winch arrangement. The upper electrical room 31 has a complete space and is used to arrange electrical cabinets, etc. In this embodiment, in order to improve the connection strength, the cylindrical shell 1 and the oblique side 12 are divided into upper and lower parts that are welded together. The welding positions between the upper and lower parts of the cylindrical shell 1 and the oblique side 12 are located at different heights, and the inner circular platform 3 is welded to the top surface of the lower half of the cylindrical shell 1. Specifically, the cylindrical shell 1 of equal diameter can be formed by rolling a standard rectangular steel plate in one go on a plate rolling machine with constant curvature. Only a few equal diameter sections need to be rolled for the entire tower body, which can be connected by circumferential welds. The material cutting, rolling, and assembly processes are extremely simple and highly standardized. Compared with conical shells, this invention eliminates the complex taper calculation and variable curvature rolling process, significantly reducing manufacturing difficulty and cost. Compared with polyhedral structures, it eliminates a large number of long straight welds and bending processes, resulting in small welding deformation and easy precision control.

[0021] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within the scope of its essence and protection. Such modifications or equivalent substitutions should also be considered to fall within the protection scope of the present invention.

Claims

1. A tower structure for a marine grab bucket variable frequency crane, characterized in that: The tower body includes a cylindrical shell of equal diameter. The cylindrical shell has two hinge points at the base of the boom on both sides and is hinged to the boom structure through the hinge points. The cylindrical shell is cut with openings diagonally upward from the upper part of the corresponding boom root hinge point and connected with the diagonally cut side at the opening. There is a tower arm gap between the diagonally cut side and the boom structure.

2. The tower structure of a marine grab bucket variable frequency crane according to claim 1, characterized in that: The main body of the tower includes an internal circular platform inside a cylindrical shell, which divides the interior of the cylindrical shell into an upper electrical room and a lower winch room.

3. The tower structure of a marine grab bucket variable frequency crane according to claim 1, characterized in that: The cylindrical shell is provided with a hinge point reinforcement structure at the hinge point position at the root of the boom.

4. The tower structure of a marine grab bucket variable frequency crane according to claim 1 or 3, characterized in that: The inner side of the obliquely cut side is provided with several reinforcing ribs.

5. The tower structure of a marine grab bucket variable frequency crane according to claim 1, characterized in that: The cylindrical shell and the obliquely cut side are divided into upper and lower parts that are fixed together.

6. The tower structure of a marine grab bucket variable frequency crane according to claim 5, characterized in that: The fixed positions of the upper and lower parts of the cylindrical shell and the oblique side are located at different heights.

7. The tower structure of a marine grab bucket variable frequency crane according to claim 1 or 3, characterized in that: The boom root hinge point is connected to the root hinge point support located on the outside of the cylindrical shell.

8. The tower structure of a marine grab bucket variable frequency crane according to claim 1, characterized in that: The upper end of the beveled side is connected to the top of the cylindrical shell, and the distance between the tops of the two beveled sides is 0.5 to 0.8 times the outer diameter of the cylindrical shell.

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