CN215160498U - Cantilever crane structure, cantilever crane system and crane - Google Patents

Abstract

The disclosure relates to a boom structure, a boom system and a crane. The arm support structure comprises: at least two layers of single-arm sections (10a, 10b) which can be nested layer by layer according to the size of the section caliber; the connecting section (20) is provided with a connecting part (24) which is used for being fixedly connected with at least one end of each layer of single-arm section (10a, 10b) in the at least two layers of single-arm sections (10a, 10b), wherein the reinforcing of the arm section structure is under the working condition, the at least two layers of single-arm sections (10a, 10b) are nested layer by layer, the connecting section (20) is arranged at the position, nested layer by layer, of at least one end of each layer of single-arm section (10a, 10b), and the connecting part (24) of the connecting section (20) is fixedly connected with the end part of each layer of single-arm section (10a, 10b) on the same side. The embodiment of the disclosure can meet the hoisting requirement of the overweight part and simultaneously improve the utilization rate of the arm support below the hoisting medium-sized part.

Description

Cantilever crane structure, cantilever crane system and crane

Technical Field

The disclosure relates to the field of engineering machinery, in particular to an arm support structure, an arm support system and a crane.

Background

Along with continuous optimization and upgrading of engineering application fields, from the construction aspect, the hoisting is more and more outstanding in efficiency and safety, the trend that the ground of a large-sized component is prefabricated in a modular manner in advance and the petrochemical tank body is hoisted integrally is more and more, and the hoisting construction of the continuously emerging oversized overweight device raises more and more requirements on the capacity of hoisting machinery; from the technical aspect, the hoisting machinery is increasingly large-sized, and higher requirements are provided for the bearing capacity of the whole structural part, particularly the arm support system serving as a key bearing structural part; from the operation aspect, according to engineering practice, the hoisting ratio of the overweight part is not too high, and the overweight part accounts for the hoisting of mostly medium-sized pieces, and the problem of overhigh operation cost is often faced when the overweight part is hoisted by the ultra-large crane in the process of hoisting the medium-sized pieces.

Disclosure of Invention

In view of this, the embodiments of the present disclosure provide an arm support structure, an arm support system, and a crane, which can meet the hoisting requirement of a super-heavy part and simultaneously improve the utilization rate of an arm support below a hoisting medium-sized part.

In one aspect of the present disclosure, there is provided a boom structure, including:

at least two layers of single-arm sections which can be nested layer by layer according to the size of the section caliber;

a connecting joint which is provided with a connecting part used for being fixedly connected with at least one end of each layer of the at least two layers of single-arm joints,

under the reinforcing service condition of the arm section structure, the at least two layers of single arm sections are nested layer by layer, the connecting section is arranged at the at least one end of the at least two layers of single arm sections which are nested layer by layer, and the connecting part of the connecting section is fixedly connected with the end part of the same side of each layer of single arm section.

In some embodiments, the connecting portion includes at least two sets of connecting joints, and under the reinforced use condition of the arm section structure, the at least two sets of connecting joints are fixedly connected with the end portions of the at least two layers of single-arm sections one by one through pin shafts or bolts.

In some embodiments, each set of connection joints forms a polygonal cross-sectional caliber that is the same size as the cross-sectional caliber of the single-armed segment of the corresponding layer.

In some embodiments, the connection joint further comprises:

at least two groups of chords, wherein each group of chords comprises a plurality of chords arranged in parallel;

at least two groups of web members which correspond to the at least two groups of chord members one by one, and each group of web members comprises a plurality of web members;

at least one group of connecting rods connected between adjacent groups of chords in the two groups of chords, wherein each group of connecting rods comprises a plurality of connecting rods;

at least one web member of the plurality of web members is arranged between two adjacent chord members of the plurality of chord members, at least one connecting rod of the plurality of connecting rods is arranged between two adjacent chord members of the adjacent group of chord members, the connecting part comprises at least two groups of connecting joints which are in one-to-one correspondence with the at least two groups of chord members, each group of connecting joints comprises a plurality of connecting joints, and the plurality of connecting joints are in one-to-one correspondence with one end or two ends of the plurality of chord members.

In some embodiments, the boom structure further comprises:

and at least one group of lacing bars are connected between adjacent single-arm sections in at least two layers of single-arm sections.

In some embodiments, the arm section structure further comprises a transition section, wherein under the working condition of the ultra-long arm of the arm section structure, the at least two layers of single arm sections are sequentially arranged along the length direction, and opposite ends of adjacent single arm sections are fixedly connected through the transition section.

In some embodiments, in the working condition of the auxiliary jib of the crane, the at least two layers of single-jib sections comprise a first single-jib section with a larger section caliber and a second single-jib section with a smaller section caliber, and the first single-jib section and the second single-jib section are respectively assembled on the main jib and the auxiliary jib of the crane.

In some embodiments, the connecting link is fixedly connected to an end of the first single-arm link and/or the second single-arm link.

In some embodiments, the single-arm section is a truss-type single-arm section or a box-type single-arm section.

In some embodiments, the single-armed segment comprises one standard segment or a plurality of standard segments connected in series along the length direction.

In some embodiments, the standard segments included in each layer of single-arm segments have the same cross-sectional caliber size.

In one aspect of the disclosure, a boom system is provided, which includes the aforementioned arm section structure.

In some embodiments, the boom system comprises two arm section structures, and the two arm section structures form a parallel double-arm structure or an A-type double-arm structure under the condition that the use condition is to be enhanced.

In some embodiments, the arm segment structure can be disassembled into a plurality of single arm segments mounted on at least two cranes as an arm support.

In one aspect of the present disclosure, there is provided a crane including:

the arm support system described above;

at least two tracked vehicles connected with the arm support system,

under the lifting working condition of a first tonnage, the at least two tracked vehicles and the arm section structure comprising at least two layers of single arm sections nested layer by layer are assembled into a single crane;

under the lifting working condition of a second tonnage, the at least two tracked vehicles are respectively assembled with the disassembled arm section structures to form at least two cranes, and the second tonnage is smaller than the first tonnage.

In one aspect of the present disclosure, there is provided a crane including:

the arm support system described above;

the circular rail base is connected with the arm support system and is provided with at least two groups of circular rails;

under the lifting working condition of a first tonnage, the ring rail base and the arm joint structure comprising at least two layers of single arm joints which are nested layer by layer are assembled into a single crane;

under the lifting working condition of a second tonnage, at least two groups of annular rails are disassembled from the annular rail base, at least two groups of annular rails are assembled with the disassembled arm section structures respectively to form at least two cranes, and the second tonnage is smaller than the first tonnage.

Therefore, according to the embodiment of the disclosure, at least two layers of single-arm sections are nested layer by layer under the reinforced use condition of the arm section structure and are fixedly connected with the end parts of the connecting sections on the same side of each layer of single-arm section, the bearing capacity of the arm frame structure is improved through the nested arm frame structure, the structure is compact, the requirement for hoisting overweight parts is met, and in other working conditions, part or all of the single-arm sections are selected from the at least two layers of single-arm sections for use, so that the utilization rate of the arm frame below the hoisting medium-sized parts is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

fig. 1 is a schematic structural view of a boom structure according to some embodiments of the present disclosure under enhanced use conditions;

fig. 2 is a schematic structural view of a connection joint in some embodiments of boom structures according to the present disclosure;

fig. 3 is a schematic cross-sectional view of a connecting joint corresponding to two layers of single arm joints in some embodiments of boom structures according to the present disclosure;

fig. 4 is a schematic cross-sectional view of a connecting joint corresponding to three layers of single arm joints in further embodiments of the boom structure according to the present disclosure;

fig. 5 is a schematic structural view of some embodiments of boom structures according to the present disclosure under an ultra-long boom use condition;

fig. 6 is a schematic structural view of some embodiments of boom structures according to the present disclosure under a working condition of a secondary jib of a crane.

It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.

The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be intervening devices between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, that particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

Fig. 1 is a schematic structural view of a boom structure according to some embodiments of the present disclosure under enhanced use conditions. Fig. 2 is a schematic structural view of a connection joint in some embodiments of boom structures according to the present disclosure. Referring to fig. 1 and 2, in some embodiments, the boom structure includes: the connecting joint 20 and at least two layers of single-arm joints which can be nested layer by layer according to the size of the section caliber. The connecting joint 20 has a connecting portion 24 for fixedly connecting with at least one end of each of the at least two layers of single-arm joints.

For example, in fig. 1, the boom structure includes two layers of single-arm sections, namely, a single-arm section 10a and a single-arm section 10 b. The size of the cross-sectional caliber of the single-arm section 10b is smaller than that of the single-arm section 10a, so that the single-arm section 10b can be placed in the inner cavity of the single-arm section 10 a. The sectional caliber herein refers to the structural dimension of the section of the single-arm joint in the direction perpendicular to the length direction of the single-arm joint, such as the dimension of the outer contour section or the inner contour section. In other embodiments, the boom structure may include more than three layers of single-arm sections, and the single-arm sections may be nested layer by layer according to the size of the cross-sectional caliber of the single-arm sections.

In fig. 1 and 2, it can be seen that the connecting portion of the connecting link 20 can be simultaneously brought into fixed connection with each layer of single-arm links. The fixed connection relationship can be detachable connection realized by a pin shaft or a screw, or non-detachable connection such as welding or bonding.

The arm support structure of the embodiment can be in different forms under various working conditions to meet the use requirements. When the arm support structure needs to bear high load, namely the reinforced use working condition of the arm section structure, the at least two layers of single arm sections are nested layer by layer, the connecting section 20 is arranged at least one end of the at least two layers of single arm sections nested layer by layer, and the connecting part 24 of the connecting section 20 is fixedly connected with the end part of the same side of each layer of single arm section. The nested and fixed structure can effectively improve the bearing capacity of the boom structure, and is more compact in structure compared with a mode of connecting a plurality of booms side by side in the related art, thereby being beneficial to meeting the hoisting requirement of overweight parts. Under other working conditions, part or all of the single arm sections are selected from at least two layers of single arm sections for use, so that the utilization rate of the arm support below the medium-sized hoisting part can be increased.

Referring to fig. 1, in some embodiments, the single-arm section is a truss-type single-arm section, which can effectively reduce the weight of the boom structure. In fig. 1, the truss-type single-armed section comprises a plurality of main chords 11 extending along the length direction of the single-armed section, and a plurality of connecting rods 12 can be arranged between the adjacent main chords 11 to realize the fixed connection between the main chords 11. In other embodiments, the single-arm joints are box-type single-arm joints, which can achieve good structural strength and rigidity. In still other embodiments, the single-armed segments of different layers may be truss-type single-armed segments and box-type single-armed segments, respectively.

In fig. 1, the single-arm segments 10a and 10b each comprise two standard segments, wherein the two standard segments of the single-arm segment 10a have a cross-sectional caliber dimension that is greater than the cross-sectional caliber dimension of the two standard segments of the single-arm segment 10 b. In length, the total length of the two standard segments of the one-arm segment 10a is equal to the total length of the two standard segments of the one-arm segment 10 b. In some embodiments, the single-armed segment may comprise one standard segment, or a plurality of standard segments connected in series along the length. The number of standard knots forming the single-arm knot can be selected according to the size of the standard knot and the requirement of actual working conditions. The number of standard sections included in the single-arm sections of different layers can be the same or different.

For an arm segment structure of equal cross-section, referring to fig. 1, in some embodiments, the cross-sectional calibers of the standard segments included in each layer of single arm segment are the same size. However, for some arm section structures with unequal cross sections, the single arm section can comprise a plurality of standard sections with different cross section calibers, the standard sections with different cross section calibers can be connected through transition sections, and when the multi-layer single arm section is nested, the standard sections with larger cross section calibers are nested layer by layer, and the standard sections with smaller cross section calibers are also nested layer by layer.

Referring to fig. 2, in some embodiments, the connection joint 20 further comprises: at least two sets of chords 21, at least two sets of web members 22 and at least one set of connecting rods 23. Each group of chords 21 includes a plurality of chords 21 arranged in parallel, and the chords 21 extend in the length direction of the single-arm segment. At least two sets of web members 22 correspond one-to-one to the at least two sets of chords 21. In fig. 2, each group of chords 21 includes four chords 21, and the four chords 21 are respectively located at four corner positions of the rectangle. The four chords 21 may be located at corner points of trapezoidal or rhombic shapes, respectively, as required.

Each set of web members 22 comprises a plurality of web members 22, and the web members 22 may be perpendicular to the chords 21. At least one web member 22 of the plurality of web members 22 is disposed between two adjacent chords 21 of the plurality of chords 21, for example, in fig. 2, two web members 22 are connected between two adjacent chords 21. In other embodiments, a single web member or more web members may be connected between two adjacent chords 21, and the width and thickness of the web members may be set as desired.

At least one set of connecting rods 23 is connected between adjacent sets of chords 21 in the two sets of chords 21, each set of connecting rods 23 including a plurality of connecting rods 23. At least one connecting rod 23 of the plurality of connecting rods 23 is disposed between two adjacent chords 21 of adjacent sets of chords 21. In fig. 2, two connecting rods 23 are provided between two adjacent chords 21. In some embodiments, a single connecting rod or more connecting rods may be disposed between two adjacent chords 21, and the width and thickness of the connecting rods may be set as desired.

Connecting portion 24 includes at least two sets of attach fitting, with at least two sets of chord 21 one-to-one, every group attach fitting includes a plurality of attach fittings, a plurality of attach fittings with the one end or the both ends one-to-one of a plurality of chord 21. In fig. 2, the connecting portion 24 has two sets of connecting joints, each set of connecting joints includes eight connecting joints, and each two connecting joints are respectively located at two ends of the chord 21 connected with the connecting joint. Thus, the connecting joint 20 can be fixedly connected with two layers of single-arm joints on one side, and can also be connected with two layers of single-arm joints of other arm support structures on the other side. Therefore, the effect that the plurality of arm support structures are connected in sequence and the connection is more stable and reliable can be realized. In other embodiments, the connecting joint may be provided at one end of the chord 21.

In the connecting joint, the chord member, the web member, the connecting rod and the connecting joint can adopt a welding type or an assembly type,

fig. 3 is a schematic cross-sectional view of a connecting joint corresponding to two layers of single arm joints in some embodiments of boom structures according to the present disclosure. Fig. 4 is a schematic cross-sectional view of a connecting joint corresponding to three layers of single-arm joints in other embodiments of the boom structure according to the present disclosure. Referring to fig. 2-4, in some embodiments, the connecting portion 24 includes at least two sets of connecting joints, and the at least two sets of connecting joints are fixedly connected to the ends of the at least two layers of single-arm sections by pins or bolts under the reinforced using condition of the arm section structure. Accordingly, the polygonal cross-sectional caliber formed by each group of the connecting joints is the same as the size of the cross-sectional calibers of the single-arm sections 10a and 10b of the corresponding layer, so that the single-arm sections of each layer are more stably connected with different groups of the connecting joints.

Referring to fig. 3 and 4, the number of the connection joint groups included in the connection portion corresponds to the number of the single arm sections included in the arm support structure. In fig. 3, the connection portion includes two sets of connection joints, and in fig. 4, the connection portion includes three sets of connection joints. In fig. 3, the two sets of connecting joints have a spacing relationship of H1> H2 in the first direction (i.e. in the vertical direction of fig. 3) and B1> B2 in the second direction (i.e. in the lateral direction of fig. 3) corresponding to the cross-sectional caliber positions of the two layers of single-arm segments.

The nested multi-layer single-arm sections are made into a whole body bearing load through the fixed connection of the connecting sections to the multi-layer single-arm sections, and in order to further improve the integrity, in some embodiments, the arm support structure further comprises at least one group of lacing bars. At least one set of lacing bars may be connected between adjacent ones of the at least two layers of single-armed sections. For example, one or two groups of lacing bars are arranged between every two adjacent layers of single arm sections so as to further strengthen the arm frame structure. For the arrangement of multiple groups of lacing lines, the lacing lines can be arranged at intervals along the length direction of the single-armed section. In other embodiments, the lacing strips may be provided on part of the single-arm sections of adjacent layers, and the lacing strips are not provided on some of the single-arm sections of adjacent layers, so as to simplify the assembly.

The arm support structure can be in different forms under various working conditions to meet the use requirements. Fig. 5 is a schematic structural view of some embodiments of boom structures according to the present disclosure under an ultra-long boom use condition. Referring to fig. 5, in some embodiments, the arm segment structure further includes a transition segment 30. Under the working condition of the ultra-long arm of the arm section structure, the at least two layers of single arm sections (such as the single arm section 10a and the single arm section 10b) are sequentially arranged along the length direction of the single arm sections, and the opposite ends of the adjacent single arm sections (such as the single arm section 10a and the single arm section 10b) are fixedly connected through the transition section 30.

Compared with the arm support structure comprising a plurality of layers of single arm sections which are nested layer by layer, when the lifting height and the working amplitude of the crane need to be improved, an operator can split the plurality of layers of single arm sections in the arm section structure adopted under the reinforced use working condition, and then the single arm sections with different section caliber sizes are connected through the transition section, so that a longer arm support structure is obtained.

Fig. 6 is a schematic structural view of some embodiments of boom structures according to the present disclosure under a working condition of a secondary jib of a crane. Referring to fig. 6, in some embodiments, in the working condition of the jib of the crane, the at least two layers of single-armed sections include a first single-armed section with a larger section caliber and a second single-armed section with a smaller section caliber, and the first single-armed section and the second single-armed section are assembled into the main jib a and the jib B of the crane respectively or assembled into the main jib a and the jib B of the crane respectively. Therefore, the utilization rate of the arm support structure is effectively improved, and other medium and small hoisting expansion requirements are met.

In this configuration, the connection link 20 may be fixedly connected to the end of the first single-arm section, may be fixedly connected to the end of the second single-arm section, or may be fixedly connected to the connection link 20 at neither the end of the first single-arm section nor the section of the second single-arm section.

The embodiment of the arm section structure disclosed by the invention can be suitable for arm support systems used by various engineering machinery. The boom system provided by the present disclosure may include any of the embodiments of the arm segment structures described above. The arm section system can be expanded in a single crane to meet the requirements of multiple working conditions of the crane, and can also be expanded among multiple different cranes, for example, arm frames of two cranes with different models are nested and reinforced to meet the requirement of reinforcing the working conditions of use. Accordingly, in some embodiments, the boom section structure can be split into a plurality of single boom sections which are installed on at least two cranes and used as the boom, that is, a user can split the boom structure under the enhanced use condition of one crane into a plurality of single boom sections and assemble the boom sections into the boom systems of a plurality of cranes with smaller tonnage.

In some embodiments, the boom system comprises two said arm-section structures, which form a parallel double-arm structure or an a-type double-arm structure under conditions that will enhance the use. That is to say, can make two sets of multilayer single armed festival nested layer by layer further make up into parallel double-arm structure or A type double-arm structure to satisfy the requirement of the hoisting capacity of further super large overweight part, it is compacter to compare in the cantilever crane system in the correlation technique in structure, it is also more convenient in the installation.

The boom system can be applied to various engineering machines (such as cranes and the like). The crane may comprise a crawler chassis or a rail crane (e.g. a ring rail crane, etc.) the present disclosure also provides a crane comprising: the cantilever crane system comprises the cantilever crane system and at least two tracked vehicles. At least two tracked vehicles are connected with the arm support system. The at least two tracked vehicles may be front and rear tracked vehicles or a dual tracked undercarriage.

Under the lifting working condition of a first tonnage, the at least two tracked vehicles and the arm section structure comprising at least two layers of single arm sections which are nested layer by layer are assembled into a single crane. Under the lifting working condition of a second tonnage, the at least two tracked vehicles are respectively assembled with the disassembled arm section structures to form at least two cranes, and the second tonnage is smaller than the first tonnage.

In other embodiments, the present disclosure also provides a crane comprising: the cantilever crane system comprises the cantilever crane system and a circular rail base connected with the cantilever crane system. The circular rail base is provided with at least two groups of circular rails. The circular track can be a closed or non-closed circular track.

Under the lifting working condition of a first tonnage, the ring rail base and the arm section structure comprising at least two layers of single arm sections which are nested layer by layer are assembled into a single crane. Under the lifting working condition of a second tonnage, at least two groups of annular rails are disassembled from the annular rail base, at least two groups of annular rails are assembled with the disassembled arm section structures respectively to form at least two cranes, and the second tonnage is smaller than the first tonnage.

The embodiment of the disclosure breaks through the thought limitation of the boom enhancement technology in the related art, and makes full use of the internal space of the boom section, so that the bearing capacity of the boom system is improved without increasing the size of the outer frame of the whole boom system, the boom system is more convenient to disassemble and assemble, and the disassembling and assembling efficiency is higher. The bearing capacity of the boom structure and the system can realize very flexible adjustability theoretically, the transformation and the expansion are simple, the utilization rate of components is high, the partial disassembly and the assembly are very flexible, the requirement of assembling the boom section structures of a single or multiple cranes is met, the hoisting of ultra-large components can be guaranteed, and the overall application economy of users is improved.

Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims (16)

1. An arm support structure, characterized by comprising:

at least two layers of single-arm sections (10a, 10b) which can be nested layer by layer according to the size of the section caliber;

a connecting section (20) having a connecting portion (24) for fixedly connecting at least one end of each of the at least two layers of single-arm sections (10a, 10b),

under the reinforcing use working condition of the arm section structure, the at least two layers of single arm sections (10a and 10b) are nested layer by layer, the connecting section (20) is arranged at least one end of the at least two layers of single arm sections (10a and 10b) which are nested layer by layer, and the connecting part (24) of the connecting section (20) is fixedly connected with the end parts of the same sides of the single arm sections (10a and 10 b).

2. The boom structure according to claim 1, characterized in that the connecting part (24) comprises at least two sets of connecting joints, and under the reinforced use condition of the boom structure, the at least two sets of connecting joints are fixedly connected with the ends of the at least two layers of single boom sections (10a, 10b) one by one through pins or bolts.

3. Boom structure according to claim 2, characterized in that the cross-sectional aperture of the polygon formed by each group of connection joints is the same size as the cross-sectional aperture of the single-armed section (10a, 10b) of the corresponding layer.

4. Boom structure according to claim 1, characterized in that the connection joint (20) further comprises:

at least two groups of chords (21), wherein each group of chords (21) comprises a plurality of chords (21) which are arranged in parallel;

at least two groups of web members (22) corresponding to the at least two groups of chords (21) one to one, each group of web members (22) comprising a plurality of web members (22);

at least one group of connecting rods (23) connected between adjacent groups of chords (21) in the two groups of chords (21), each group of connecting rods (23) comprising a plurality of connecting rods (23);

wherein at least one web member (22) of the plurality of web members (22) is disposed between two adjacent chords (21) of the plurality of chords (21), at least one connecting rod (23) of the plurality of connecting rods (23) is disposed between two adjacent chords (21) of the adjacent sets of chords (21), the connecting portion (24) includes at least two sets of connecting joints, one-to-one correspondence is made with the at least two sets of chords (21), each set of connecting joints includes a plurality of connecting joints, and the plurality of connecting joints one-to-one correspondence is made with one end or two ends of the plurality of chords (21).

5. The boom structure of claim 1, further comprising:

at least one set of lacing bars connected between adjacent ones (10a, 10b) of the at least two layers of single-armed sections (10a, 10 b).

6. The arm segment structure of claim 1, further comprising a transition segment (30), wherein under the working condition of the ultra-long arm of the arm segment structure, the at least two layers of single arm segments (10a, 10b) are sequentially arranged along the length direction, and opposite ends of the adjacent single arm segments (10a, 10b) are fixedly connected through the transition segment (30).

7. The arm segment structure according to claim 1, wherein the at least two layers of single arm segments (10a, 10B) comprise a first single arm segment with a larger cross-sectional caliber and a second single arm segment with a smaller cross-sectional caliber assembled into the main arm (a) and the sub arm (B) of the crane, respectively, or assembled into the main arm (a) and the sub arm (B) of the crane, respectively, in the sub arm condition of the crane.

8. The arm segment structure according to claim 7, characterized in that the connecting segment (20) is fixedly connected to the end of the first and/or second single-arm segment.

9. Boom structure according to any of claims 1-8, characterized in that the single-armed section (10a, 10b) is a truss-like single-armed section or a box-like single-armed section.

10. The boom structure according to claim 1-5, characterized in that the single boom section (10a, 10b) comprises one standard section or a plurality of standard sections connected in sequence along the length direction.

11. The arm segment structure according to claim 10, characterized in that the standard segments included in each layer of single-arm segments (10a, 10b) have the same size of cross-sectional caliber.

12. A boom system, comprising:

at least one arm segment structure according to any one of claims 1 to 11.

13. The boom system of claim 12, comprising two arm segment structures forming a parallel double arm structure or an a-type double arm structure under conditions that will enhance use.

14. Boom system according to claim 12, characterized in that the boom segment structure can be disassembled into a number of single boom segments (10a, 10b) mounted as a boom on at least two cranes.

15. A crane, comprising:

the boom system of claim 12;

at least two tracked vehicles connected with the arm support system,

under the lifting working condition of a first tonnage, the at least two tracked vehicles and the arm section structure comprising at least two layers of single arm sections (10a, 10b) nested layer by layer are assembled into a single crane;

under the lifting working condition of a second tonnage, the at least two tracked vehicles are respectively assembled with the disassembled arm section structures to form at least two cranes, and the second tonnage is smaller than the first tonnage.

16. A crane, comprising:

the boom system of claim 12;

the circular rail base is connected with the arm support system and is provided with at least two groups of circular rails;

under the lifting working condition of a first tonnage, the ring rail base and the arm joint structure comprising at least two layers of single arm joints (10a, 10b) which are nested layer by layer are assembled into a single crane;

under the lifting working condition of a second tonnage, at least two groups of annular rails are disassembled from the annular rail base, at least two groups of annular rails are assembled with the disassembled arm section structures respectively to form at least two cranes, and the second tonnage is smaller than the first tonnage.

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