Auxiliary boom structure of floating crane cantilever
By adopting a design that combines tension and compression of the main chord in the sub-boom structure of the floating crane cantilever, adding a fourth main chord and using branch pipes to share the load, the problems of large weight and complex processing of traditional structures are solved, and efficient load-bearing and improved stability are achieved.
Patent Information
- Application Number
- CN202520271903.7
- 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
The sub-boom structure of traditional floating cranes is heavy and complex to manufacture when the length-to-height ratio is greater than 4. It is also difficult to form thick round tubes when the root is subjected to large bending moments, which leads to high requirements for processing equipment and makes it difficult to effectively withstand large axial pressure and bending moments.
The upper auxiliary boom section adopts a structural design where the first and second main chords are mainly under tension, while the lower auxiliary boom section uses the third, fourth, and fifth main chords mainly under superimposed compression. The fourth main chord is added to enhance the load-bearing capacity, and the load is distributed through the side and lower support pipes to avoid pressure concentration.
It achieves stability of the secondary boom structure under large axial pressure and bending moment, reduces structural weight, simplifies the manufacturing process, and improves overall load-bearing capacity and compressive strength.
Smart Images
Figure CN223659694U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a floating crane, especially relates to a vice arm support structure of floating crane cantilever. BACKGROUND
[0002] The floating crane is a kind of engineering ship specially engaged in hoisting operation.The vice arm support of its cantilever is mostly box type or truss form of four main chord bars, and the two forms are commonly used when the length of vice arm support is relatively short.
[0003] When the vice arm support structure adopts box type structure form, to ensure that the arm support plate has sufficient stability, in design, in addition to being provided with transverse partition plate to divide the arm support in length direction, a large number of angle steel structures are welded in the length direction of arm support as longitudinal reinforcing bars to improve the buckling resistance of arm support box type structure plate.But when the vice arm support is relatively long (length-height ratio is greater than 4), the traditional box type structure is relatively heavy, and the internal rib plate is complex to manufacture.
[0004] If the force arm of the traditional truss form of four main chord bars increases, large bending moment will be generated at the root portion, and the root portion needs to bear the increased bending moment, so that thick circular pipes are needed to bear the larger stress at the root portion.However, thick circular pipes are difficult in process, and the forming process is complex, and the processing equipment is required to be high. TECHNICAL CONTENT
[0005] The utility model aims at providing a vice arm support structure of floating crane cantilever, which can bear larger axial pressure and bending moment.
[0006] One aspect of the utility model provides a vice arm support structure of floating crane cantilever, which comprises an upper vice arm support part and a lower vice arm support part, wherein the upper vice arm support part is located above the lower vice arm support part, the upper vice arm support part comprises a first main chord bar and a second main chord bar, the first main chord bar is connected with the second main chord bar, the lower vice arm support part comprises a third main chord bar, a fourth main chord bar and a fifth main chord bar, the third main chord bar is connected with the fourth main chord bar, and the fourth main chord bar is connected with the fifth main chord bar.
[0007] In an embodiment, the fourth main chord bar is parallel to the center line of the cantilever.
[0008] In an embodiment, the third main chord bar and the fifth main chord bar are symmetrically arranged about the fourth main chord bar.
[0009] In an embodiment, the vice arm support structure further comprises a plurality of first side branch pipes, and the plurality of first side branch pipes are connected with the first main chord bar and the third main chord bar.
[0010] In an embodiment, the sub-boom structure further comprises a plurality of second side struts; the plurality of second side struts connect the second main chord and the fifth main chord.
[0011] In an embodiment, the upper sub-boom portion further comprises a plurality of upper struts; the plurality of upper struts connect the first main chord and the second main chord.
[0012] In an embodiment, the lower sub-boom portion further comprises a plurality of first lower struts; the plurality of first lower struts connect the third main chord and the fourth main chord.
[0013] In an embodiment, the lower sub-boom portion further comprises a plurality of second lower struts; the plurality of second lower struts connect the fourth main chord and the fifth main chord.
[0014] In an embodiment, the sub-boom structure further comprises a box support; the box support is connected to one end of the first main chord, the second main chord, the third main chord, the fourth main chord and the fifth main chord; the other end of the first main chord, the second main chord, the third main chord, the fourth main chord and the fifth main chord is connected to the main boom.
[0015] In an embodiment, the ratio of the axial length of the sub-boom structure to the height of the main boom is greater than 4.
[0016] The sub-boom structure of the floating crane cantilever of the utility model adds the fourth main chord in the lower sub-boom portion, so that the sub-boom can bear larger axial pressure and bending moment. The first main chord and the second main chord of the upper sub-boom portion are mainly in tension and adapt to small force flow; the third main chord, the fourth main chord and the fifth main chord of the lower sub-boom portion are mainly in compression and adapt to large force flow, overcoming the requirement of pipe thickness of the lower piece to bending moment. Meanwhile, the sub-boom structure of the utility model does not need to make a rib plate, reduces the structure weight, is simple to manufacture and easy to maintain. BRIEF DESCRIPTION OF DRAWINGS
[0017] The above and other features, properties and advantages of the utility model will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which:
[0018] Figure 1 is the structure schematic view of the box type sub-boom before improvement;
[0019] Figure 2 is the structure schematic view of the sub-boom of four main chords before improvement;
[0020] Figure 3 is the schematic view of one embodiment of the sub-boom structure of the floating crane cantilever according to the utility model.
[0021] Figure 4 is Figure 3 A-A sectional view in FIG. 1;
[0022] Figure 5 is Figure 3 B-B sectional view in FIG. 1. DETAILED DESCRIPTION
[0023] Floating crane is a kind of engineering ship which is specially engaged in hoisting operation. The auxiliary boom of its cantilever is mostly in the form of box type or four main chord truss. These two forms are commonly seen in the auxiliary boom with relatively short length.
[0024] Figure 1 The auxiliary boom 2 in the form of box type structure is shown. As shown in Figure 1 When the auxiliary boom 2 is in the form of box type structure, in order to ensure that the boom structure plate has sufficient stability, in the design, in addition to the transverse partition plate which divides the boom in the length direction, a large number of angle steel structures are welded in the length direction of the boom as longitudinal reinforcing bars to improve the buckling resistance of the boom box type structure plate.
[0025] Figure 1 The axial length and height ratio of the auxiliary boom 2 in the form of box type structure shown in
[0026] Figure 2 The auxiliary boom 2 in the form of four main chord truss is shown. Figure 2 The axial length and height ratio of the auxiliary boom 2 in the form of four main chord truss shown in Figure 2 As shown in
[0027] However, thick round pipe is relatively difficult in process, and the forming process is complex, and the processing equipment is required to be high.
[0028] Reference will now be made in detail to the embodiments of the present application, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the present application, not limitation of the present application. In fact, it will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the scope or spirit of the present application. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield still a further embodiment. Thus, it is intended that the present application covers modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.
[0029] As used herein, the term "offshore floating full slewing crane" is a kind of special engineering equipment integrating ship floating platform and full slewing crane function, mainly used for heavy lifting operation in complex offshore environment.
[0030] The term "jib" is the arm-like structure of floating crane used for suspending and lifting heavy objects, extending outward from the main body of the crane, and completing the lifting operation by rotating around the vertical axis, pitching, etc. to cooperate with the lifting of goods.
[0031] The term "main boom" is the lifting boom from the root hinge point articulated with the rotating platform or tower body of the floating crane to the axis of the wire rope guide sheave of the main lifting mechanism installed at the head of the lifting boom.
[0032] The term "auxiliary boom" is a section of adjustable angle lifting boom attached to the head of the main boom, which can increase the operation range of the floating crane, including height and amplitude, etc.
[0033] Figure 3 The auxiliary boom structure of the jib of the floating crane of the present application is shown. Figure 3 is the side view of the auxiliary boom structure of the present application. Among them, the floating crane can be specifically an offshore floating full slewing crane. The jib of the floating crane includes a main boom 1 and an auxiliary boom, and the auxiliary boom is connected with the head of the main boom 1.
[0034] As shown in Figure 3 The auxiliary boom structure of the jib of the floating crane of the present application includes an upper auxiliary boom part 10 and a lower auxiliary boom part 20. Among them, the upper auxiliary boom part 10 is located above the lower auxiliary boom part 20. The upper auxiliary boom part 10 includes a first main chord 100 and a second main chord 200. The first main chord 100 and the second main chord 200 are connected. The lower auxiliary boom part 20 includes a third main chord 300, a fourth main chord 400 and a fifth main chord 500. The third main chord 300 and the fourth main chord 400 are connected, and the fourth main chord 400 and the fifth main chord 500 are connected.
[0035] The auxiliary boom structure of the floating crane cantilever of the utility model increases the fourth main chord 400 in the lower auxiliary boom part 20, so that the auxiliary boom can bear larger axial pressure and bending moment. The first main chord 100 and the second main chord 200 of the upper auxiliary boom part 10 are mainly subjected to tension and adapt to small force flow; the third main chord 300, the fourth main chord 400 and the fifth main chord 500 of the lower auxiliary boom part 20 are mainly subjected to superimposed compression and adapt to large force flow, overcoming the requirement of the pipe thickness of the lower piece to the bending moment.
[0036] Meanwhile, compared with the traditional box type auxiliary boom 2, the auxiliary boom structure of the utility model does not need to make a rib plate, reduces the structure weight, is simple to manufacture and easy to maintain.
[0037] With reference to the auxiliary boom structure of the floating crane cantilever of the utility model still further Figure 3 In an embodiment, the auxiliary boom structure further comprises a box body support 900. The box body support 900 is connected with one end of the first main chord 100, the second main chord 200, the third main chord 300, the fourth main chord 400 and the fifth main chord 500. The other end of the first main chord 100, the second main chord 200, the third main chord 300, the fourth main chord 400 and the fifth main chord 500 is connected with the main boom 1.
[0038] In the embodiment, the box body support 900 is provided with a pulley and a lifting hook. When the floating crane hoists a heavy object, the pulley can change the direction of the steel wire rope tension, so as to flexibly control the lifting, lowering and other actions of the heavy object, so as to realize complex hoisting operation.
[0039] In an embodiment, with reference to the side view of the auxiliary boom structure of the floating crane cantilever of the utility model still further Figure 3 The auxiliary boom structure further comprises a plurality of first side branch pipes 610. The plurality of first side branch pipes 610 are connected with the first main chord 100 and the third main chord 300, so as to enhance the rigidity of the overall structure, reduce the distortion such as twisting and bending caused by stress, share the load of the first main chord 100 and the third main chord 300 and reduce stress concentration.
[0040] The plurality of first side branch pipes 610 are sequentially arranged along the center line X-X of the cantilever. The arrangement mode of the plurality of first side branch pipes 610 can be as shown in Figure 3
[0041] With reference to the auxiliary boom structure of the floating crane cantilever of the utility model still further Figure 3 The number of the first side branch pipes 610 can be seven.
[0042] Correspondingly, the auxiliary boom structure further comprises a plurality of second side branch pipes 620. The plurality of second side branch pipes 620 are connected with the second main chord 200 and the fifth main chord 500, so as to enhance the rigidity of the overall structure, reduce the distortion such as twisting and bending caused by stress, share the load of the second main chord 200 and the fifth main chord 500 and reduce stress concentration.
[0043] Multiple second side branch pipes 620 are sequentially installed along the centerline XX of the cantilever. The arrangement of the multiple second side branch pipes 620 can be as follows: Figure 3 As shown.
[0044] Continue to refer to Figure 3 The number of second side branch pipes 620 can be selected as seven.
[0045] Figure 4 It shows Figure 3 A sectional view of AA. (e.g.) Figure 4 As shown, the upper auxiliary boom section 10 also includes multiple upper support pipes 710. These upper support pipes 710 connect the first main chord 100 and the second main chord 200. When the first main chord 100 and the second main chord 200 are under tension, the upper support pipes 710 can decompose and transmit the tension borne by the first main chord 100 and the second main chord 200, preventing them from bearing excessive tension alone and improving load-bearing capacity.
[0046] Multiple upper branch pipes 710 are sequentially installed along the centerline XX of the cantilever. The arrangement of the multiple upper branch pipes 710 can be as follows: Figure 4 As shown.
[0047] Continue to refer to Figure 4 The number of upper branch pipes 710 can be selected as seven.
[0048] Figure 5 It shows Figure 3 A cross-sectional view of BB. In one embodiment, the fourth main chord 400 is parallel to the centerline XX of the cantilever. Furthermore, the third main chord 300 and the fifth main chord 500 are symmetrically arranged about the fourth main chord 400. This allows the pressure to be distributed more evenly across the third main chord 300, the fifth main chord 500, and the fourth main chord 400. When the structure is subjected to a large flow, this symmetrical structure avoids pressure concentration on a single main chord, improving the overall compressive strength of the structure. It also allows the third main chord 300, the fifth main chord 500, and the fourth main chord 400 to work together to share the pressure load, effectively enhancing the stability and load-bearing capacity of the structure.
[0049] In addition, the bending moment will affect the lower auxiliary boom section 20, which helps to better resist the bending moment, thereby reducing the bending moment requirement on the thickness of the lower tube, making the structure more stable when subjected to bending moment, and reducing the risk of structural failure due to excessive bending moment.
[0050] It should be noted that the fourth main chord 400 is not connected to the first main chord 100 and the second main chord 200. That is, there is no need to set a connecting branch between the fourth main chord 400 and the upper auxiliary boom section 10. This structure is simple, will not cause structural congestion, and can withstand a certain amount of pressure.
[0051] In one embodiment, the lower auxiliary boom section 20 further includes a plurality of first lower branch pipes 810 and a plurality of second lower branch pipes 820. The plurality of first lower branch pipes 810 connect to the third main chord 300 and the fourth main chord 400. The plurality of second lower branch pipes 820 connect to the fourth main chord 400 and the fifth main chord 500. The arrangement and number of the first lower branch pipes 810 and the second lower branch pipes 820 can be as follows: Figure 5 As shown.
[0052] The first lower branch pipe 810 and the second lower branch pipe 820 can respectively help the third main chord 300 and the fourth main chord 400, and the fourth main chord 400 and the fifth main chord 500 to better transmit and share the pressure, so that the three main chords can bear the load more evenly when superimposed under pressure, avoid the pressure from concentrating on a local position of a certain main chord, and enhance the compressive strength of the overall structure.
[0053] The auxiliary boom structure of this utility model can adapt to working conditions where the ratio of the axial length of the auxiliary boom structure to the height of the main boom 1 is greater than 4, that is, working conditions where the length of the auxiliary boom structure is relatively long. In such cases... Figure 3 In the embodiment of the sub-boom structure of this utility model shown, the axial length to height ratio of the sub-boom structure is 23000:5000 = 4.6. The first main chord 100 and the second main chord 200 of the upper sub-boom portion 10 of this utility model are primarily under tension, adapting to small force flows; the third main chord 300, the fourth main chord 400, and the fifth main chord 500 of the lower sub-boom portion 20 are primarily under superimposed compression, adapting to large force flows and overcoming the bending moment requirements on the tube thickness of the lower section.
[0054] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible variations and modifications without departing from the spirit and scope of the present invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.
Claims
1. A sub-jib structure of a floating crane jib, characterized by, comprising an upper sub-boom portion and a lower sub-boom portion; the upper sub-boom portion is above the lower sub-boom portion; the upper sub-boom portion comprises a first main chord and a second main chord; the first main chord and the second main chord are connected; the lower sub-boom portion comprises a third main chord, a fourth main chord and a fifth main chord; the third main chord and the fourth main chord are connected, and the fourth main chord and the fifth main chord are connected.
2. The counter jib structure of claim 1, wherein the fourth main chord is parallel to the centerline of the cantilever.
3. The counter jib structure of claim 2, wherein the third main chord and the fifth main chord are symmetrically arranged about the fourth main chord.
4. The counter jib structure of any one of claims 1-3, wherein, the sub-boom structure further comprises a plurality of first side branches; the plurality of first side branches connect the first main chord and the third main chord.
5. The counter jib structure of any one of claims 1-3, wherein, the sub-boom structure further comprises a plurality of second side branches; the plurality of second side branches connect the second main chord and the fifth main chord.
6. The counter jib structure of any one of claims 1-3, wherein, the upper sub-boom portion further comprises a plurality of upper branches; the plurality of upper branches connect the first main chord and the second main chord.
7. The counter jib structure of any one of claims 1-3, wherein, the lower sub-boom portion further comprises a plurality of first lower branches; the plurality of first lower branches connect the third main chord and the fourth main chord.
8. The counter jib structure of any one of claims 1-3, wherein, the lower sub-boom portion further comprises a plurality of second lower branches; the plurality of second lower branches connect the fourth main chord and the fifth main chord.
9. The counter jib structure of any one of claims 1-3, wherein, the sub-boom structure further comprises a box support; the box support is connected to one end of the first main chord, the second main chord, the third main chord, the fourth main chord and the fifth main chord; the other end of the first main chord, the second main chord, the third main chord, the fourth main chord and the fifth main chord is connected to the main boom.
10. The counter jib structure of claim 9, wherein the ratio of the axial length of the sub-boom structure to the height of the main boom is greater than 4.