Jib

Abstract

The present disclosure provides a boom, belonging to the field of hoisting and transporting machinery. The boom includes a boom root, a boom middle part, a boom front part and a boom head. The boom middle part includes two extension units, and each extension unit includes four main chord members that are parallel to each other. Along the direction from the boom root to the boom head, the four main chord members include two first main chord members and two second main chord members, and the two first main chord members are located between the two second main chord members and the symmetry plane. The boom front part includes a front box body and a truss connection structure. The truss connection structure includes six truss chord members. The six truss chord members include two first truss chord members and four second truss chord members. The first end of each first truss chord member is connected to one end of two first main chord members that are symmetric about the symmetry plane, and the first ends of the four second truss chord members are respectively and correspondingly connected to one end of the four second main chord members. The boom head is connected to the front box body. The present disclosure can reduce the weight of the boom head.

Description

Technical Field

[0001] The present disclosure belongs to the field of crane transporters, and particularly relates to a boom. Background Art

[0002] The boom is an important component of a crane for lifting goods. The root of the boom is usually rotatably connected to the turntable of the crane, and a lifting pulley is provided at the head of the boom. A lifting wire rope with one end connected to a winch is arranged on the lifting pulley, and the winch controls the retraction and release of the lifting wire rope to realize the lifting and lowering of the goods connected to the other end of the lifting wire rope.

[0003] In related technologies, the booms of cranes mostly adopt four-chord booms or eight-chord booms. The structure of a four-chord boom mainly includes four main chords arranged in parallel, multiple web members for support arranged between the four main chords, and a boom head provided at one end of the four main chords for installing structures such as a lifting pulley. An eight-chord boom is formed by arranging two four-chord booms side by side and connecting them with a connecting rod in the middle. The boom head of the eight-chord boom is connected to eight main chords.

[0004] However, the four-chord boom has a weak anti-eccentric load capacity. Although the eight-chord boom can carry a large load, the overall weight of the eight-chord boom is relatively heavy, especially the weight of the boom head is relatively large, which is not conducive to reducing the overall self-weight of the crane. Summary of the Invention

[0005] An embodiment of the present disclosure provides a boom that can reduce the weight of the boom head. The technical solution is as follows:

[0006] An embodiment of the present disclosure provides a boom. The boom includes a boom root, a boom middle part, a boom front part, and a boom head connected in sequence, and the boom has a symmetry plane. The boom middle part includes two extension units, the two extension units are symmetric about the symmetry plane and are connected to the boom root. Each extension unit includes four main chord members that are parallel to each other. Along the direction from the boom root to the boom head, the distance between each main chord member and the symmetry plane gradually decreases. The four main chord members include two first main chord members and two second main chord members, and the two first main chord members are located between the two second main chord members and the symmetry plane. The boom front part includes a truss connection structure and a front box body. The truss connection structure includes six truss chord members, the six truss chord members include two first truss chord members and four second truss chord members. The two first truss chord members are parallel to each other and are located in the symmetry plane. The four second truss chord members are symmetrically located on both sides of the symmetry plane in pairs. The first end of each first truss chord member is connected to one end of two first main chord members that are symmetric about the symmetry plane. The first ends of the four second truss chord members are connected to the first ends of the four second main chord members in a one-to-one correspondence. The second ends of the four second truss chord members and the second ends of the two first truss chord members are both connected to the front box body. The boom head is connected to the front box body.

[0007] In another implementation manner of the present disclosure, the truss connection structure further includes two chord transition plates, the two chord transition plates are parallel to each other and perpendicular to the symmetry plane. One side edge of each chord transition plate is connected to one end of two first main chord members that are symmetric about the symmetry plane, and the other side edge of each chord transition plate is connected to one of the two first truss chord members.

[0008] In another implementation manner of the present disclosure, the truss connection structure further includes a plurality of front web members. The front web members are connected between two adjacent truss chord members, and the plurality of front web members between two adjacent truss chord members are connected end to end in sequence. Each chord transition plate is connected to the two front web members closest to the chord transition plate, and the two front web members connected to the chord transition plate are symmetric about the first truss chord member.

[0009] In yet another implementation of the present disclosure, the front part of the boom further includes multiple truss support structures. The multiple truss support structures are arranged at intervals along the length direction of the boom. Each group of the truss support structures includes six front panel sections and two truss link assemblies. The two truss link assemblies are symmetric about the symmetry plane. The six front panel sections are arranged in one-to-one correspondence with the six truss chords, and the front panel sections are perpendicularly connected to the corresponding truss chords. Each truss link assembly includes four truss first links and one truss second link. Both ends of each truss first link are connected to two adjacent front panel sections, and the four truss first links enclose a rectangular frame structure. Both ends of the truss second link are connected to two front panel sections located on the diagonal of the rectangular frame structure.

[0010] In yet another implementation of the present disclosure, the extension unit further includes multiple middle web members. The middle web members are connected between two adjacent main chords, and multiple middle web members between two adjacent main chords are connected end to end. Each chord transition plate is connected to two middle web members closest to the chord transition plate, and the two middle web members connected to the chord transition plate are symmetric about the first truss chord.

[0011] In yet another implementation of the present disclosure, the middle part of the boom further includes multiple middle support structures. The multiple middle support structures are arranged at intervals along the length direction of the boom. Each middle support structure includes eight middle panel sections, two middle first link assemblies, and one middle second connection assembly. The two middle first link assemblies are respectively connected to both sides of the middle second connection assembly. Each middle first link assembly includes four middle first links and one middle second link. Both ends of each middle first link are connected to two adjacent middle panel sections, and the four middle first links enclose a rectangular frame structure. Both ends of the middle second link are connected to two middle panel sections located on the diagonal of the rectangular frame structure. The middle second connection assembly includes two middle third links and multiple middle fourth links. The two middle third links are parallel to each other, and both ends of each middle third link are respectively connected to two middle panel sections located in the middle. The multiple middle fourth links are connected end to end between the two middle third links, and the middle fourth link located at the end is connected to the middle panel section located on the diagonal of the rectangular frame structure.

[0012] In yet another implementation of the present disclosure, the boom root includes two root units that are symmetric about the symmetry plane. Each root unit includes a root box body and four boom root legs. The four boom root legs are connected to the root box body, and along the direction from the boom root to the boom middle, the distance between each boom root leg and the symmetry plane gradually decreases. The two extension units are connected to the two root units in a one-to-one correspondence, and the four main chords in each extension unit are coaxially connected to the four boom root legs in the corresponding root unit in a one-to-one correspondence.

[0013] In yet another implementation of the present disclosure, the front part of the boom further includes two luffing ear plates for installing luffing pulleys. The two luffing ear plates are symmetric about the symmetry plane and are both perpendicularly connected to the first surface of the front box body. Along the direction from the boom middle to the boom front, the two luffing ear plates approach each other.

[0014] In yet another implementation of the present disclosure, the boom head includes four head chords and a head end plate. The first ends of the four head chords are connected to the four second truss chords in a one-to-one correspondence, the second ends of the four head chords are connected to the head end plate, and the second ends of the two head chords on the same side of the symmetry plane are connected together.

[0015] In yet another implementation of the present disclosure, the boom further includes a plurality of main hoist ear plates for installing main hoist pulleys. The plurality of main hoist ear plates are arranged in pairs, and each pair of main hoist ear plates is symmetric about the symmetry plane. Multiple pairs of main hoist ear plates are arranged at intervals along the extension direction of the boom. A part of the paired main hoist ear plates is connected to the boom middle, and another part of the paired main hoist ear plates is connected to the boom front. Along the direction from the boom middle to the boom front, the two main hoist ear plates in each pair of main hoist ear plates approach each other.

[0016] In yet another implementation of the present disclosure, the boom further includes a plurality of main hoist ear plates for installing main hoist pulleys. The plurality of main hoist ear plates are arranged in pairs, and each pair of main hoist ear plates is symmetric about the symmetry plane. Multiple pairs of main hoist ear plates are arranged at intervals along the extension direction of the boom. A part of the paired main hoist ear plates is connected to the boom middle, and another part of the paired main hoist ear plates is connected to the boom front. For any pair of main hoist ear plates, along the direction from the boom middle to the boom front, the two main hoist ear plates approach each other.

[0017] The beneficial effects brought by the technical solution provided by the embodiments of the present disclosure are:

[0018] In the boom provided by the embodiments of the present disclosure, eight main chord members in the middle of the boom are respectively connected to the boom root 1, and six truss chord members in the front of the boom are correspondingly connected to the eight main chord members in the middle of the boom. In this way, the boom can be a symmetric structure and connected as a whole, thereby ensuring that the force transmission can be realized relatively stably.

[0019] Moreover, since the four main chord members in the boom include two first main chord members and two second main chord members, and the six truss chord members include two first truss chord members and four second truss chord members, the first end of each first truss chord member is connected to one end of two first main chord members symmetric about the symmetry plane, and the first ends of the four second truss chord members are correspondingly connected to one end of the four second main chord members one by one. In this way, the eight main chord members in the middle of the boom can be correspondingly connected to the six truss chord members in the front of the boom, greatly reducing the weight of the front part of the boom.

[0020] That is to say, this structure of the above-mentioned boom can not only stably realize the force transmission, but also greatly reduce the weight of the boom when the volume of the boom is not much different from that of the original eight-chord boom, and at the same time, it can have a bending moment with a larger load like the eight-chord boom, thereby effectively realizing the lifting of structures such as leg with a large weight. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is a schematic structural diagram of the boom provided by the embodiments of the present disclosure;

[0023] Figure 2 is a side view of the boom provided by the embodiments of the present disclosure;

[0024] Figure 3 is Figure 1 an enlarged view of part A in

[0025] Figure 4 is Figure 1 an enlarged view of part B in

[0026] Figure 5 is for Figure 1 a cross-sectional view along the a-a direction in

[0027] Figure 6 is for Figure 1 an enlarged view of part C in

[0028] Figure 7is Figure 1 A sectional view taken along the b-b direction in

[0029] Figure 8 is Figure 1 An enlarged view of part D in

[0030] Figure 9 is Figure 2 An enlarged view of part E in

[0031] Figure 10 A schematic diagram of the rotational connection structure provided by an embodiment of the present invention;

[0032] Figure 11 is Figure 1 A sectional view taken along the c-c direction in

[0033] The meanings represented by the symbols in the figure are as follows:

[0034] 1. Boom root; 11. Root unit; 111. Root box; 112. Boom root leg; 1112. Rotational connection structure; 1121. Connecting piece; 1122. Fixed piece; 13. Root connecting rod; 14. Fixed rod; 15. Transverse rib plate; 16. Longitudinal rib plate;

[0035] 2. Middle part of the boom; 21. Extension unit; 211. Main chord; 2111. First main chord; 2112. Second main chord; 212. Middle web member; 23. Middle support structure; 233. Middle panel; 234. First middle link assembly; 2341. First middle link; 2342. Second middle link; 235. Second middle connection assembly; 2351. Third middle link; 2352. Fourth middle link;

[0036] 3. Front part of the boom; 31. Front box; 32. Truss connection structure; 321. Truss chord; 3211. First truss chord; 3212. Second truss chord; 322. Chord transition plate; 323. Front web member; 324. Support structure; 3243. Front panel; 3244. Truss link assembly; 3241. First truss link; 3242. Second truss link; 33. Luffing ear plate;

[0037] 4. Head of the boom; 41. Head chord; 42. Head end plate;

[0038] 5. Main hoist ear plate; 6. Auxiliary hoist ear plate;

[0039] 100. Symmetry plane. Detailed implementation manners

[0040] To make the objectives, technical solutions, and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0041] An embodiment of the present disclosure provides a boom, as Figure 1 shown. The boom includes a boom root 1, a boom middle part 2, a boom front part 3, and a boom head 4 that are connected in sequence. The boom has a symmetry plane 100. The boom middle part 2 includes two extension units 21. The two extension units 21 are symmetric about the symmetry plane 100 and are connected to the boom root 1.

[0042] Figure 2 is a side view of the boom provided by the embodiment of the present disclosure. Combining Figure 2 , each extension unit 21 includes four main chord members 211 that are parallel to each other.

[0043] Continue to refer to Figure 1 , along the direction from the boom root 1 to the boom head 4, the distance between each main chord member 211 and the symmetry plane 100 gradually decreases. The four main chord members 211 include two first main chord members 2111 and two second main chord members 2112. The two first main chord members 2111 are located between the two second main chord members 2112 and the symmetry plane 100.

[0044] The boom front part 3 includes a truss connection structure 32 and a front box body 31. The truss connection structure 32 includes six truss chord members 321. The six truss chord members 321 include two first truss chord members 3211 and four second truss chord members 3212. The two first truss chord members 3211 are parallel to each other and are located within the symmetry plane 100. The four second truss chord members 3212 are symmetrically located on both sides of the symmetry plane 100 in pairs. The first end of each first truss chord member 3211 is connected to one end of two first main chord members 2111 that are symmetric about the symmetry plane. The first ends of the four second truss chord members 3212 are connected to the first ends of the four second main chord members 2112 in one-to-one correspondence. The second ends of the four second truss chord members 3212 and the second ends of the two first truss chord members 3211 are both connected to the front box body 31. The boom head 4 is connected to the front box body 31.

[0045] In the boom provided by the embodiment of the present disclosure, by connecting the eight main chord members 211 of the boom middle part 2 to the boom root 1 respectively, and connecting the six truss chord members 321 of the boom front part 3 to the eight main chord members 211 of the boom middle part 2 correspondingly, the boom can be made into a symmetric structure and be connected as a whole, thereby ensuring that the force transmission can be realized stably.

[0046] Moreover, the four main chord members 211 in the boom include two first main chord members 2111 and two second main chord members 2112, and the six truss chord members 321 include two first truss chord members 3211 and four second truss chord members 3212. The first end of each first truss chord member 3211 is connected to one end of two first main chord members 211 that are symmetric about the symmetry plane 100, and the first ends of the four second truss chord members 3212 are respectively and correspondingly connected to one end of the four second main chord members 2112. In this way, the eight main chord members 211 in the middle part 2 of the boom can be correspondingly connected to the six truss chord members 321 in the front part 3 of the boom, greatly reducing the weight of the front part 3 of the boom.

[0047] That is to say, this structure of the above boom can not only stably transmit force, but also greatly reduce the weight of the boom when the volume of the boom is not much different from that of the original eight-chord boom. At the same time, it can also have a bending moment with a larger load like the eight-chord boom, and thus can effectively lift structures such as heavy pile legs.

[0048] Exemplarily, the two first main chord members 2111 and the two second main chord members 2112 in each extension unit 21 together form a frame structure, and the two first main chord members 2111 and the two second main chord members 2112 are respectively located at the four end points of the frame structure. This can facilitate the connection between the main chord members 211 and increase the stability of the boom.

[0049] Figure 3 Yes Figure 1 is an enlarged view of part A in, combined with Figure 3 . Optionally, the truss connection structure 32 further includes two chord transition plates 322. The two chord transition plates 322 are parallel to each other and perpendicular to the symmetry plane 100. One side edge of each chord transition plate 322 is connected to one end of two first main chord members 211 that are symmetric about the symmetry plane, and the other side edge of each chord transition plate 322 is connected to one of the two first truss chord members 3211.

[0050] In the above implementation, the arrangement of the chord transition plates 322 can effectively connect the main chord members 211 to the corresponding truss chord members 321.

[0051] Exemplarily, the chord transition plates 322 are welded to the corresponding main chord members 211 and truss chord members 321. This can enable quick connection and ensure the connection strength.

[0052] Figure 4 Yes Figure 1 is an enlarged view of part B in, combined with Figure 4Optionally, the truss connection structure 32 further includes a plurality of front web members 323. The front web members 323 are connected between two adjacent truss chord members 321, and the plurality of front web members 323 between two adjacent truss chord members 321 are connected end to end in sequence. Each of the chord transition plates 322 is connected to the two front web members 323 closest to the chord transition plate 322, and the two front web members 323 connected to the chord transition plate 322 are symmetric about the first truss chord member 3211.

[0053] In the above implementation, by providing the front web members 323, the six truss chord members 321 can be connected into one body, thereby increasing the overall structural stability of the front part 3 of the boom.

[0054] Exemplarily, the front web members 323 are also connected to the truss chord members 321 by welding.

[0055] Figure 5 For Figure 1 the sectional view along the a-a direction in, combined with Figure 5 Optionally, the front part 3 of the boom further includes a plurality of groups of truss support structures 324. The plurality of groups of truss support structures 324 are arranged at intervals along the length direction of the boom. Each group of truss support structures 324 includes six front panel members 3243 and two truss link assemblies 3244. The two truss link assemblies 3244 are symmetric about the symmetry plane. The six front panel members 3243 are arranged in one-to-one correspondence with the six truss chord members 321, and the front panel members 3243 are perpendicularly connected to the corresponding truss chord members 321. Each truss link assembly 3244 includes four truss first links 3241 and one truss second link 3242. Both ends of each truss first link 3241 are connected to two adjacent front panel members 3243, and the four truss first links 3241 enclose a rectangular frame structure; both ends of the truss second link 3242 are connected to two front panel members 3243 located on the diagonal of the rectangular frame structure.

[0056] In the above implementation, through the front panel members 3243, a firm connection between the truss first links 3241, the truss second links 3242 and the truss chord members 321 can be achieved, thereby improving the connection strength between the truss chord members 321, preventing the strength of the truss chord members 321 from being affected, and further improving the overall stability of the boom.

[0057] Figure 6 For Figure 1 the enlarged view of part C in, combined with Figure 6 Optionally, the front part 3 of the boom further includes two luffing lugs 33 for installing luffing pulleys. The two luffing lugs 33 are symmetric about the symmetry plane 100, and are both perpendicularly connected to the first surface of the front box 31. Along the direction from the middle part 2 of the boom to the front part 3 of the boom, the two luffing lugs 33 approach each other.

[0058] In the above implementation, the luffing lug plate 33 is used to mount the luffing pulley on the front part 3 of the boom to achieve the luffing of the boom. Moreover, the two luffing lug plates 33 are close to each other, so that the steel wire rope straddling the luffing pulley can avoid other components, and at the same time, it does not affect the force on the luffing pulley.

[0059] In addition, angle steel can be additionally provided on the inner wall of the front box body 31 to improve the stability of the boom.

[0060] See again Figure 4 , optionally, the middle web member 212 is connected between two adjacent main chord members 211, and multiple middle web members 212 between two adjacent main chord members 211 are connected end to end. Each chord transition plate 322 is connected to the two middle web members 212 closest to the chord transition plate 322, and the two middle web members 212 connected to the chord transition plate 322 are symmetric about the first truss chord 3211.

[0061] In the above implementation, by providing the middle web member 212, the eight main chord members 211 can be connected into one body, thereby increasing the overall structural stability of the middle part 2 of the boom.

[0062] Exemplarily, the middle web member 212 has the same structure and function as the front web member 323, both of which are to improve the overall stability of the boom.

[0063] Figure 7 For Figure 1 the cross-sectional view along the b-b direction in Figure 7Optionally, the middle part 2 of the boom further includes a plurality of middle support structures 23. The plurality of middle support structures 23 are arranged at intervals along the length direction of the boom. Each middle support structure 23 includes eight middle panel sections 233, two middle first link assemblies 234 and one middle second connection assembly 235. The two middle first link assemblies 234 are respectively connected to both sides of the middle second connection assembly 235. Each middle first link assembly 234 includes four middle first links 2341 and one middle second link 2342. The two ends of each middle first link 2341 are connected to two adjacent middle panel sections 233, and the four middle first links 2341 enclose a rectangular frame structure. The two ends of the middle second link 2342 are connected to two middle panel sections 233 located on the diagonal line of the rectangular frame structure. The middle second connection assembly 235 includes two middle third links 2351 and a plurality of middle fourth links 2352. The two middle third links 2351 are parallel to each other, and the two ends of each middle third link 2351 are respectively connected to two middle panel sections 233 located in the middle. The plurality of middle fourth links 2352 are connected end to end between the two middle third links 2351, and the middle fourth link 2352 located at the end is connected to the middle panel section 233 located on the diagonal line of the rectangular frame structure.

[0064] In the above implementation, the stability of the two extension units 21 can be improved through the middle support structure 23, so that the boom can withstand a greater bending moment and increase the anti-eccentric load capacity of the boom.

[0065] The middle support structure 23 is set to the above structure, so that simply connecting multiple main chord members 211 together can further increase the structural stability of the middle part 2 of the boom.

[0066] Exemplarily, two adjacent middle support structures 23 can be connected together. This can further increase the structural stability of the middle part 2 of the boom.

[0067] Figure 8 For Figure 1 the enlarged view of part D in Figure 8 . Optionally, the head part 4 of the boom includes four head chord members 41 and a head end plate 42. The first ends of the four head chord members 41 correspond to and are butted against the four second truss chord members 3212 one by one, and the second ends of the four head chord members 41 are connected to the head end plate 42.

[0068] Figure 9 For Figure 2 the enlarged view of part E in Figure 9 . The second ends of the two head chord members 41 located on the same side of the symmetry plane 100 are connected to each other.

[0069] In the above implementation, the head chord 41 is used to be correspondingly connected to the four second truss chords 3212. The head end plate 42 is used to connect the four head chords 41 into one body. The second ends of the head chords 41 are connected to each other, which can make the head chords 41 incline downward to facilitate the hoisting of goods.

[0070] Exemplarily, in order to increase the connection stability between the head chords 41, multiple head web members can also be provided between two adjacent head chords 41. The arrangement and connection manner of the head web members are similar to those of the middle web members 212 and the front web members 323 described above, and will not be elaborated here.

[0071] Refer to again Figure 4 . Optionally, the boom further includes a plurality of main hoist lugs 5 for installing main hoist pulleys. The plurality of main hoist lugs 5 are arranged in pairs, and each pair of main hoist lugs 5 is symmetric about the symmetry plane 100. The multiple pairs of main hoist lugs 5 are arranged at intervals along the extending direction of the boom. A part of the paired main hoist lugs 5 is connected to the middle part 2 of the boom, and another part of the paired main hoist lugs 5 is connected to the front part 3 of the boom. For any pair of main hoist lugs 5, along the direction from the middle part 2 to the front part 3 of the boom, the two main hoist lugs 5 approach each other.

[0072] In the above implementation, the main hoist lug 5 is used to install the main hoist pulley. In addition, the paired main hoist lugs 5 approach each other, which can avoid interference between the main hoist wire rope and other components.

[0073] Refer to again Figure 6 , the boom further includes two auxiliary hoist lugs 6. The two auxiliary hoist lugs 6 are symmetric about the symmetry plane 100, and the two auxiliary hoist lugs 6 are connected to the front box body 31.

[0074] In the above implementation, the auxiliary hoist lug 6 is used to install the auxiliary hoist pulley.

[0075] Refer to again Figure 1 , the boom root 1 includes two root units 11. The two root units 11 are symmetric about the symmetry plane 100. Each root unit 11 includes a root box body 111 and four boom root legs 112. The four boom root legs 112 are connected to the root box body 111, and along the direction from the boom root 1 to the middle part 2 of the boom, the distance between each boom root leg 112 and the symmetry plane 100 gradually decreases. The two extension units 21 are correspondingly connected to the two root units 11 one by one, and the four main chords 211 in each extension unit 21 are coaxially connected to the four boom root legs 112 in the corresponding root unit 11 one by one.

[0076] In the above implementation, the above structure can make the boom a symmetric structure, and can make the boom have a larger sectional moment of inertia, be able to withstand the bending moment of a larger load, have a stronger anti-eccentric load capacity, and can effectively realize the hoisting of structures such as heavy pile legs.

[0077] Figure 10 is a schematic diagram of the rotational connection structure provided by an embodiment of the present invention. As Figure 10 shown, a rotational connection structure 1112 can be provided on each root box 111. When the boom is connected to the turntable of the crane, the boom can be connected to the turntable of the crane through the rotational connection structure 1112.

[0078] Exemplarily, the rotational connection structure 1112 can include a connecting member 1121 and a fixing member 1122. The fixing member 1122 is arranged between the connecting member 1121 and the root box 111. The connecting member 1121 can be connected to the double-ear plate structure on the turntable of the crane through a pin shaft. The thickness of the connecting member 1121 is less than the thickness of the fixing member 1122. This structure can realize the connection between the boom and the crane with a relatively simple structure.

[0079] Figure 11 is Figure 1 the sectional view along the c-c direction in Figure 11 . Optionally, the boom root 1 further includes two parallel root connecting rods 13. The two root connecting rods 13 are located between the two root boxes 111, and both ends of each root connecting rod 13 are respectively connected to the two root boxes 111.

[0080] In the above implementation, the root connecting rods 13 are used to connect the two root boxes 111 together.

[0081] Exemplarily, a through hole for inserting the boom root leg 112 is provided on each root box 111, so as to facilitate the fixing and installation of the boom root leg 112 on the root box 111.

[0082] Optionally, the boom root 1 further includes a plurality of fixing rods 14. The fixing rods 14 are arranged end to end between the two root connecting rods 13.

[0083] In the above implementation, the arrangement of the fixing rods 14 can increase the strength of the boom.

[0084] Optionally, a transverse rib plate 15 and a longitudinal rib plate 16 are provided in each root box 111. The arrangement of the transverse rib plate 15 and the longitudinal rib plate 16 can increase the overall strength of the boom root 1.

[0085] For the above-provided eight-chord rod connecting six-chord rod boom, the boom root 1 and the boom middle part 2 adopt a structural form of eight-chord rods, and the boom front part 3 and the boom head part 4 adopt a structural form of six-chord rods.

[0086] Such a structural form can be applied to a truss boom with a root opening greater than 6m. At the same time, the boom head is narrower than that of an eight-chord boom, effectively reducing the weight of the boom head.

[0087] The above are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included within the protection scope of the present disclosure.

Claims

1. A boom, characterized in that, the boom includes a boom root (1), a boom middle part (2), a boom front part (3) and a boom head (4) connected in sequence, and the boom has a symmetry plane (100); the boom middle part (2) includes two extension units (21), the two extension units (21) are symmetric about the symmetry plane (100) and are connected to the boom root (1), each extension unit (21) includes four main chord members (211) that are parallel to each other, along the direction from the boom root (1) to the boom head (4), the distance between each main chord member (211) and the symmetry plane (100) gradually decreases, the four main chord members (211) include two first main chord members (2111) and two second main chord members (2112), and the two first main chord members (2111) are located between the two second main chord members (2112) and the symmetry plane (100); the boom front part (3) includes a truss connection structure (32) and a front box body (31), the truss connection structure (32) includes six truss chord members (321), the six truss chord members (321) include two first truss chord members (3211) and four second truss chord members (3212), the two first truss chord members (3211) are parallel to each other and are located in the symmetry plane (100), the four second truss chord members (3212) are symmetrically located on both sides of the symmetry plane (100) in pairs, the first end of each first truss chord member (3211) is connected to one end of two first main chord members (2111) that are symmetric about the symmetry plane (100), the first ends of the four second truss chord members (3212) are connected to the ends of the four second main chord members (2112) in one-to-one correspondence, and the second ends of the four second truss chord members (3212) and the second ends of the two first truss chord members (3211) are both connected to the front box body (31); the boom head (4) is connected to the front box body (31).

2. The boom according to claim 1, characterized in that, the truss connection structure (32) further includes two chord transition plates (322), the two chord transition plates (322) are parallel to each other and perpendicular to the symmetry plane (100); one side edge of each chord transition plate (322) is connected to one end of two first main chord members (2111) that are symmetric about the symmetry plane (100), and the other side edge of each chord transition plate (322) is connected to one of the two first truss chord members (3211).

3. The boom according to claim 2, characterized in that, the truss connection structure (32) further includes a plurality of front web members (323), the front web members (323) are connected between two adjacent truss chord members (321), and the plurality of front web members (323) between two adjacent truss chord members (321) are connected end to end in sequence; Each of the chord transition plates (322) is connected to the two front web members (323) closest to the chord transition plate (322), and the two front web members (323) connected to the chord transition plate (322) are symmetric about the first truss chord (3211).

4. The boom according to any one of claims 1 to 3, wherein, the front part (3) of the boom further includes a plurality of truss support structures (324), the plurality of truss support structures (324) are arranged at intervals along the length direction of the boom, and each truss support structure (324) includes six front panel members (3243) and two truss link assemblies (3244), and the two truss link assemblies (3244) are symmetric about the symmetry plane (100); the six front panel members (3243) are arranged in one-to-one correspondence with the six truss chords (321), and the front panel members (3243) are perpendicularly connected to the corresponding truss chords (321); each truss link assembly (3244) includes four truss first links (3241) and one truss second link (3242), and both ends of each truss first link (3241) are connected to two adjacent front panel members (3243), and the four truss first links (3241) enclose a rectangular frame structure; both ends of the truss second link (3242) are connected to two front panel members (3243) located on the diagonal of the rectangular frame structure.

5. The boom according to claim 2, wherein, the extension unit (21) further includes a plurality of middle web members (212); the middle web members (212) are connected between two adjacent main chords (211), and the plurality of middle web members (212) between two adjacent main chords (211) are connected end to end; each of the chord transition plates (322) is connected to the two middle web members (212) closest to the chord transition plate (322), and the two middle web members (212) connected to the chord transition plate (322) are symmetric about the first truss chord (3211).

6. The boom according to any one of claims 1 to 3, wherein, the middle part (2) of the boom further includes a plurality of middle support structures (23), the plurality of middle support structures (23) are arranged at intervals along the length direction of the boom, and each middle support structure (23) includes eight middle panel members (233), two middle first link assemblies (234) and one middle second connection assembly (235); The two middle first link assemblies (234) are respectively connected to both sides of the middle second connection assembly (235). Each middle first link assembly (234) includes four middle first links (2341) and one middle second link (2342). The two ends of each middle first link (2341) are connected to two adjacent middle intermediate plates (233). The four middle first links (2341) enclose a rectangular frame structure. The two ends of the middle second link (2342) are connected to two middle intermediate plates (233) located on the diagonal of the rectangular frame structure. The middle second connection assembly (235) includes two middle third links (2351) and multiple middle fourth links (2352). The two middle third links (2351) are parallel to each other. The two ends of each middle third link (2351) are respectively connected to two middle intermediate plates (233) located in the middle. The multiple middle fourth links (2352) are connected end to end between the two middle third links (2351). The middle fourth link (2352) located at the end is connected to the middle intermediate plate (233) located on the diagonal of the rectangular frame structure.

7. The boom according to any one of claims 1 to 3, characterized in that the boom root (1) includes two root units (11). The two root units (11) are symmetric about the symmetry plane (100). Each root unit (11) includes a root box body (111) and four boom root legs (112). The four boom root legs (112) are connected to the root box body (111). Along the direction from the boom root (1) to the boom middle (2), the distance between each boom root leg (112) and the symmetry plane (100) gradually decreases. The two extension units (21) are connected to the two root units (11) in one-to-one correspondence. The four main chord members (211) in each extension unit (21) are coaxially connected to the four boom root legs (112) in the corresponding root unit (11) in one-to-one correspondence.

8. The boom according to any one of claims 1 to 3, characterized in that the boom front part (3) further includes two luffing ear plates (33) for installing luffing pulleys. The two luffing ear plates (33) are symmetric about the symmetry plane (100) and are both perpendicularly connected to the first surface of the front box body (31). Along the direction from the boom middle (2) to the boom front part (3), the two luffing ear plates (33) approach each other.

9. The boom according to any one of claims 1 to 3, characterized in that the boom head (4) includes four head chord members (41) and a head end plate (42); The first ends of the four head chord members (41) are connected to the four second truss chord members (3212) in a one-to-one correspondence. The second ends of the four head chord members (41) are connected to the head end plate (42), and the second ends of the two head chord members (41) located on the same side of the symmetry plane (100) are connected to each other.

10. The boom according to any one of claims 1 to 3, characterized in that the boom further comprises a plurality of main hoist lugs (5) for mounting main hoist pulleys, the plurality of main hoist lugs (5) are arranged in pairs, and each pair of main hoist lugs (5) is symmetric about the symmetry plane (100). A plurality of pairs of main hoist lugs (5) are arranged at intervals along the extending direction of the boom. A part of the pairs of main hoist lugs (5) is connected to the middle part (2) of the boom, and another part of the pairs of main hoist lugs (5) is connected to the front part (3) of the boom; Along the direction from the middle part (2) of the boom to the front part (3) of the boom, the two main hoist lugs (5) in each pair of main hoist lugs (5) approach each other.

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