Torsion-resistant connecting device of floating crane boom
By using inclined connectors and intersecting line cutting and welding on the boom of a floating crane to form an X-shaped structure, the problem of increased load under torque on traditional floating crane booms is solved, the torsional resistance of the structure is improved and the manufacturing complexity and cost are reduced.
Patent Information
- Application Number
- CN202520276729.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-20
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2035-02-20
AI Technical Summary
Under torque, the load at the connection of a traditional floating crane boom increases, which affects structural safety and working performance. Existing solutions, such as increasing wall thickness, are limited or the cost of flared transitions is high.
The first, second, and third connectors are arranged at an angle, and the intersecting line cutting and welding are combined to form an X-shaped structure, which reduces the load on the connector and improves the stress distribution, avoiding complex transition structures.
It improves torsional resistance, reduces load at the connection, simplifies the manufacturing process, and reduces costs.
Smart Images
Figure CN223659695U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a floating crane, especially to a torsion-resistant connecting device of a floating crane jib. BACKGROUND
[0002] The jib of the traditional heavy-duty crane is mainly subjected to axial force and hardly bears torque. With the development of the market, especially the requirement of horizontal double-hook overturning operation, the torque borne by the jib has reached an extent that cannot be ignored. The microcosmic manifestation of the jib under the action of the torque is a large increase in the horizontal rod load. This change not only affects the normal working performance of the jib, but also poses a severe challenge to the structural safety of the jib.
[0003] The connecting body between the two sides of the main leg of the traditional jib is usually an H-shaped truss, the axis of which forms a 90-degree angle with the center line of the jib. The inclined branch pipes at both ends of the truss are connected to the main jib. Under the action of large torque, the force of the inclined branch pipe is greatly increased, resulting in difficulty in calculating the end node.
[0004] However, the existing solutions are as follows: one is to increase the wall thickness of the main pipe, but this is limited by the pipe winding process capability. In actual production, the technical level of the pipe winding process limits the increase range of the wall thickness of the main pipe, and the problem cannot be solved by increasing the wall thickness without limit. The other solution is to use a horn-shaped transition, but the manufacturing is complex and the cost is high. SUMMARY
[0005] The utility model aims at providing a torsion-resistant connecting device of a floating crane jib, which has torsion resistance.
[0006] One aspect of the utility model provides a torsion-resistant connecting device of a floating crane jib, which comprises at least one connecting body; the connecting body comprises a first connecting piece, a second connecting piece and a third connecting piece; the first connecting piece connects the two side main legs of the jib, and the central axis of the first connecting piece is obliquely arranged relative to the center line of the jib; the second connecting piece connects the side main leg of the jib and the first connecting piece; and the third connecting piece connects the other side main leg of the jib and the first connecting piece.
[0007] In an embodiment, the central axis of the second connecting piece is obliquely arranged relative to the center line of the jib, and the central axis of the third connecting piece is obliquely arranged relative to the center line of the jib; the second connecting piece and the third connecting piece are coaxially arranged.
[0008] In an embodiment, the included angle between the central axis of the first connecting piece and the center line of the jib is 60°.
[0009] In an embodiment, the two ends of the first connecting piece are butt-jointed with the two side main legs of the jib through the intersection line cutting and are connected through welding.
[0010] In an embodiment, the first end of the second connecting member is connected to one side main leg of the cantilever crane through a line intersection cutting and welding; and the second end of the second connecting member is connected to the first connecting member through a node plate.
[0011] In an embodiment, the first end of the third connecting member is connected to the other side main leg of the cantilever crane through a line intersection cutting and welding; and the second end of the third connecting member is connected to the first connecting member through a node plate.
[0012] In an embodiment, the number of the first connecting member, the second connecting member and the third connecting member of the connecting body is two.
[0013] In an embodiment, the torsion-resistant connecting device further comprises a plurality of branch pipes; and the plurality of branch pipes connects two first connecting members.
[0014] In an embodiment, the number of the connecting body is two.
[0015] In an embodiment, the first connecting member is a strut pipe; and / or the second connecting member is a strut pipe; and / or the third connecting member is a strut pipe.
[0016] The first connecting member of the torsion-resistant connecting device of the floating crane cantilever crane has a certain angle with the center line of the cantilever crane, has reasonable arrangement angle and flexibility, has torsion resistance, reduces the load of the connecting body, improves the stress of the connecting part, avoids using a complex horn-shaped transition, and reduces the cost. BRIEF DESCRIPTION OF DRAWINGS
[0017] The above and other features, properties and advantages of the present application will become more apparent through the following description with reference to the drawings and embodiments, in which:
[0018] Figure 1 is the connecting body of the floating crane cantilever crane before improvement;
[0019] Figure 2a is Figure 1 is a sectional view of H1-H1;
[0020] Figure 2b is Figure 1 is a sectional view of H2-H2;
[0021] Figure 2c is Figure 1 is a local enlarged view of A;
[0022] Figure 3 is a schematic view of an embodiment of the torsion-resistant connecting device of the floating crane cantilever crane according to the present application;
[0023] Figure 4a is Figure 3 a sectional view of V1-V1 in the middle;
[0024] Figure 4b is Figure 3 a sectional view of V2-V2 in the middle. DETAILED DESCRIPTION
[0025] The traditional boom of the heavy-duty crane is mainly subjected to axial force and almost no torque. With the development of the market, especially the requirement of the transverse double-hook overturning operation, the torque borne by the boom has reached an unnegligible level. The microcosmic manifestation of the boom under the action of the torque is a large increase in the horizontal rod load. This change not only affects the normal working performance of the boom, but also poses a severe challenge to the structural safety of the boom.
[0026] Figure 1 The structure of the boom connector of the traditional floating crane before improvement is shown. Figure 2a and Figure 2b respectively show Figure 1 the sectional views of H1-H1 and H2-H2 in the middle, connected and supported between the two main pipes 11 by multiple branch pipes 13.
[0027] As shown in Figure 1 , Figure 2a and Figure 2b , the traditional boom includes two side legs 10 connected by a connector between the two side legs 10. The number of the connector can be multiple, as shown in Figure 1 , the number of the connector is two.
[0028] With reference to Figure 1 , generally speaking, the connector is an H-shaped truss structure, the axis (the central axis of the main pipe 11) of which forms a 90° angle with the center line X-X of the boom. Among them, the center line X-X of the boom refers to a virtual straight line located at the geometric center of the boom from the root of the boom to the end of the boom.
[0029] The truss is connected to the main boom at both ends by the inclined branch pipe 12. However, under the action of large torque, the force of the inclined branch pipe 12 is greatly increased, resulting in difficulty in calculating the end node.
[0030] The connector before improvement as shown in Figure 1 includes ten node plates 14. Among them, the node plate 14 is a kind of steel plate used for strengthening the node area, which is usually used for connecting trusses, supports, inclined branch pipes and other components. By means of welding or bolt connection, multiple components are connected together to play the role of load transmission and dispersion.
[0031] To address the issue of significantly increased stress in the inclined branch pipe under high torque conditions, one existing solution is to increase the wall thickness of the main pipe 11. However, this is limited by the pipe rolling process capability. In actual production, the technical level of the pipe rolling process restricts the extent to which the wall thickness of the main pipe 11 can be increased; therefore, the problem cannot be solved indefinitely by increasing the wall thickness.
[0032] Solution two is to use a flared transition to increase the load-bearing capacity of the connecting body, such as... Figure 2c As shown. However, this solution is complex to manufacture and expensive.
[0033] Reference will now be made in detail to embodiments of the present invention, one or more examples of which are illustrated in the accompanying drawings. Each example is provided to explain the present invention and not to limit it. In fact, it will be apparent to those skilled in the art that various modifications and variations may be made to the present invention without departing from the scope or spirit thereof. For example, features shown or described as part of one embodiment may be used with another embodiment to produce yet another embodiment. Therefore, the present invention is intended to cover these modifications and variations that fall within the scope of the appended claims and their equivalents.
[0034] As used in this article, the term "floating slewing crane" is a special engineering equipment that integrates a floating platform and slewing lifting functions, and is mainly used for heavy lifting operations in complex marine environments.
[0035] The term "boom" refers to a movable rod-like or frame-like structural component on a floating crane used for lifting, transporting, and placing heavy objects. It can rotate around a specific fulcrum and can extend or fold as needed to lift heavy objects between different positions and heights to meet the needs of cargo loading and unloading, engineering construction, and other operations in areas such as seas or ports.
[0036] Figure 3 A top view of an anti-torsional connection device for a floating crane boom is shown. Specifically, the floating crane can be an offshore floating full-rotation crane. For example... Figure 3 As shown, the anti-torsional connection device for the boom of this utility model includes at least one connecting body. The connecting body includes a first connecting member 100, a second connecting member 200, and a third connecting member 300. The first connecting member 100 connects the two main legs 10 of the boom, and the central axis of the first connecting member 100 is inclined relative to the centerline XX of the boom. The second connecting member 200 connects one main leg 10 of the boom to the first connecting member 100. The third connecting member 300 connects the other main leg 10 of the boom to the first connecting member 100.
[0037] The center axis of the first connecting piece 100 of the torsion-resistant connecting device of the floating crane boom has a certain included angle with the center line X-X of the boom, has reasonable arrangement angle and flexibility, so that the connecting body has torsion resistance, reduces the load of the connecting body, improves the stress of the connecting part, and simultaneously avoids the use of a complex horn-shaped transition, thereby reducing the cost.
[0038] In an embodiment, the center axis of the second connecting piece 200 is arranged obliquely relative to the center line X-X of the boom, and the center axis of the third connecting piece 300 is arranged obliquely relative to the center line X-X of the boom.
[0039] Optionally, as shown in Figure 1 The included angle between the second connecting piece 200 and the center line X-X of the boom and the included angle between the third connecting piece 300 and the center line X-X of the boom can be consistent with the included angle between the first connecting piece 100 and the center line X-X of the boom.
[0040] The included angle between the center axis of the first connecting piece 100 and the center line X-X of the boom ranges from 45° to 75°, and is preferably 60°. If the above-mentioned included angle is too small, the first connecting piece is too long, which results in large consumption and affects the torsion resistance to some extent; if the above-mentioned included angle is too large, the structure approaches an H-shaped truss, and the torsion effect cannot be achieved.
[0041] In an embodiment, the two ends of the first connecting piece 100 are connected to the two side main legs 10 of the boom through interpenetrating line cutting, and are connected through welding.
[0042] In the embodiment, that is, the two ends of the first connecting piece 100 and the two side main legs 10 of the boom are directly connected in the form of interpenetrating lines. Direct interpenetrating line connection refers to a connection mode in which two or more steel pipe members are directly welded through full penetration welding seams by precisely cutting the profile lines (interpenetrating lines) at the intersection positions of the members, so that the end surfaces of the members are completely fitted. This connection mode does not need to rely on a node plate or other transition piece, thereby realizing continuous transmission of the load between the members, improving the mechanical properties and load-carrying capacity of the boom structure, and being beneficial to optimizing the overall structural layout of the boom.
[0043] Specifically, the cutting profile can be calculated according to the spatial geometric interpenetrating line equation; the end part of the first connecting piece 100 is cut by interpenetrating lines by using a numerical control cutting device, so as to form a contact surface completely fitted with the outer walls of the two sides of the boom; and the first connecting piece 100 after cutting is connected to the boom, and is welded and fixed through full penetration welding seams.
[0044] In an embodiment, the first end of the second connecting member 200 is connected to one side main leg 10 of the cantilever crane through a line intersection cut and is connected through welding. The connection between the second connecting member 200 and the one side main leg 10 of the cantilever crane can refer to the connection between the first connecting member 100 and the main leg 10, that is, the second connecting member 200 is directly connected to the one side main leg 10 of the cantilever crane in the form of a line intersection.
[0045] In an embodiment, the first end of the third connecting member 300 is connected to the other side main leg 10 of the cantilever crane through a line intersection cut and is connected through welding. The connection between the third connecting member 300 and the other side main leg 10 of the cantilever crane can refer to the connection between the first connecting member 100 and the main leg 10, that is, the third connecting member 300 is directly connected to the one side main leg 10 of the cantilever crane in the form of a line intersection.
[0046] The second end of the second connecting member 200 is connected to the first connecting member 100 through the node plate 400. The second end of the third connecting member 300 is connected to the first connecting member 100 through the node plate 400. As shown in Figure 3 , the node plate 400 connects the first connecting member 100, the second end of the second connecting member 200, and the second end of the third connecting member 300.
[0047] The number of the connecting body of the torsion-resistant connecting device can be multiple. As shown in Figure 3 , the number can be selected to be two. The multiple connecting bodies are arranged in sequence along the center line X-X of the cantilever crane. The adjacent two connecting bodies can have a gap or can be seamlessly connected.
[0048] Figure 4a The sectional view of the torsion-resistant connecting device of Figure 3 is shown; Figure 4b The sectional view of the torsion-resistant connecting device of Figure 3 is shown.
[0049] As shown in Figure 4a and Figure 4b , in one connecting body, the number of the first connecting member 100, the second connecting member 200, and the third connecting member 300 is two, so that the connection strength and the stability of the connection can be improved.
[0050] Further, as shown in Figure 3 to Figure 4b , the torsion-resistant connecting device includes four node plates 400. Compared with the connecting body before improvement shown in Figure 1 which includes ten node plates 14, the node plates used in the torsion-resistant connecting device are greatly reduced, so that the manufacturing difficulty of the connecting body is greatly reduced, and significant economic benefits can be achieved.
[0051] In addition, the second connecting member 200 and the third connecting member 300 can be selected to be a support pipe.
[0052] The anti-torsion connecting device further comprises a plurality of branch pipes 500.
[0053] As shown in Figure 4a and Figure 4b In one connecting body, the number of the branch pipes 500 is four, and the branch pipes 500 are arranged in an "M" type to connect the two first connecting members 100.
[0054] The central axis of the first connecting member 100 forms an included angle of about 60° with the center line X-X of the arm support, and forms an X type structure in a plan view, which is different from the traditional H type truss structure, and the anti-torsion connecting device has the anti-torsion capacity.
[0055] Although the anti-torsion connecting device is disclosed in the above preferred embodiments, it is not intended to limit the anti-torsion connecting device, and any person skilled in the art can make possible changes and modifications without departing from the spirit and scope of the anti-torsion connecting device. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the anti-torsion connecting device, which does not depart from the technical scheme of the anti-torsion connecting device, falls within the protection scope defined by the claims of the anti-torsion connecting device.
Claims
1. A torsion-resistant connection device for a floating crane jib, characterized in that The connecting body comprises at least one connecting member; wherein The connecting member comprises a first connecting piece, a second connecting piece and a third connecting piece; The first connecting piece connects two side main legs of the arm support, and a central axis of the first connecting piece is arranged obliquely relative to a center line of the arm support; The second connecting piece connects a side main leg of the arm support and the first connecting piece; The third connecting piece connects another side main leg of the arm support and the first connecting piece.
2. Anti-twist connection according to claim 1, characterized in that A central axis of the second connecting piece is arranged obliquely relative to the center line of the arm support, and a central axis of the third connecting piece is arranged obliquely relative to the center line of the arm support; The second connecting piece and the third connecting piece are coaxially arranged.
3. Anti-twist connection according to claim 2, characterized in that An included angle between the central axis of the first connecting piece and the center line of the arm support is 60°.
4. The anti-rotation coupling device of claim 1, wherein, Two ends of the first connecting piece are connected to the two side main legs of the arm support through intersecting line cutting and welding.
5. Anti-twist connection according to claim 4, characterized in that A first end of the second connecting piece is connected to the side main leg of the arm support through intersecting line cutting and welding; A second end of the second connecting piece is connected to the first connecting piece through a node plate.
6. Anti-twist connection according to claim 5, characterized in that A first end of the third connecting piece is connected to the other side main leg of the arm support through intersecting line cutting and welding; A second end of the third connecting piece is connected to the first connecting piece through a node plate.
7. Anti-twist connection according to any of claims 1 to 6, characterized in that The number of the first connecting piece, the second connecting piece and the third connecting piece of the connecting body is two.
8. Anti-twist connection according to claim 7, characterized in that The anti-torsion connecting device further comprises a plurality of branch pipes; The plurality of branch pipes connect the two first connecting pieces.
9. Anti-twist connection according to any of claims 1-6, characterized in that The number of the connecting bodies is two.
10. Anti-twist connection device according to any of claims 1-6, characterized in that The first connecting piece is a strut pipe; and / or The second connecting piece is a strut pipe; and / or The third connecting piece is a strut pipe.