Single-double combined boom structure of crane and mast crane thereof

Abstract

The invention discloses a single-double combined boom structure of a crane, which comprises a lower boom section, an upper boom section and a transition joint, the lower boom section is of a double-arm structure, the two sides of the lower boom section are symmetrical, and the upper boom section is of a single-arm structure; the arm support lower section is formed by sequentially connecting a root part, a root part section and a lower section standard section, and the arm support upper section is formed by sequentially connecting an upper section standard section and a head section; the upper arm support section and the lower arm support section are connected through a transition joint. The upper section of the single-double combined cantilever crane structure is the single arm, the lower section of the single-double combined cantilever crane structure is the double arms, the transition joint is arranged at the transition position of the single arm and the double arms, lateral stability is good, and meanwhile arrangement of a connecting beam is avoided. Compared with a single-arm boom, the lateral stability of the single-arm and double-arm boom structure is better, the self weight of the single-arm and double-arm boom structure is lighter, and the single-arm and double-arm boom structure has obvious advantages in the aspects of technical feasibility, safety, economical efficiency and the like; each rod of the transition joint adopts a circular tube section, and the transition joint is symmetrically arranged in structure and is compact in structure and reasonable in force transmission.

Description

Technical Field

[0001] The invention relates to a crane single-double combined boom structure and a mast crane thereof, belonging to the technical field of lifting machinery. Background Art

[0002] A jib crane is a type of jib crane used for loading and unloading cargo at ports and terminals. It can be categorized as either fixed or mobile. Fixed-mast cranes utilize a mast secured at both ends by supports or ropes. The crane relies on a winch to move the boom via ropes. Large-capacity jib cranes typically feature a double-jib structure, with two jib sections arranged symmetrically, a narrow hinge at the upper end and a wide hinge at the lower end to increase lateral load capacity. A connecting beam is installed midway between the two jib sections to enhance jib stability. The jib sections are split, with joints connecting the sections for easy installation, disassembly, and transportation. However, the yaw force of the load can cause significant internal forces at the connecting beams of these jib sections, leading to excessive local stresses and complex local jib structure arrangements. Due to transportation constraints, the connection between the jib head beam and the two jib sections requires separation. However, the internal forces and stresses at this location are high, making the joints less robust. The boom of a mast crane is a simply supported member at both ends within the luffing plane and a cantilever member within the boom plane. Generally, the boom has a larger slenderness ratio within the boom plane, making it more prone to instability. A single-boom structure is simple in construction and easy to work with. However, under the action of horizontal deflection forces at the boom end within the boom plane, a large bending moment is easily generated at the boom root. Therefore, a single-boom structure is typically used in applications where the boom length is not large. A double-boom structure has two widely spaced fulcrums at the boom root, which enhances the overall stability of the boom, which in turn translates into a load-bearing capacity issue for each single boom. Depending on the boom length, one or more connecting beams can be installed between the two single booms of the double-boom structure. The connecting beams reduce the slenderness ratio of the single boom and improve stability. However, under the action of horizontal loads at the boom end, a large stress concentration occurs at the junction of the connecting beam and the single boom, requiring a reasonable arrangement of the local rod system. This makes the split design of the boom more difficult. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the defects of the existing technology and the requirements for loading and unloading overweight cargo at the dock, and to propose a crane single-double combined boom structure and a mast crane thereof.

[0004] To solve this technical problem, the present invention provides a single-double combination boom structure of a crane, comprising a boom lower section, an boom upper section and a transition section. The boom lower section is a double-arm structure, symmetrical on both sides, and the upper section is a single-arm structure; the boom lower section is composed of a root, a root section and a lower section standard section connected in sequence, and the boom upper section is composed of an upper section standard section and a head section connected in sequence; the boom upper section and the boom lower section are connected by a transition section.

[0005] The root includes a root beam, a root hinge and a root flange, and the root hinge and the root flange are respectively welded on both sides of the two ends of the root beam; the root is connected to the root section through the root flange by a group of bolts; the arm structure is fixed on the base through the root beam and the root hinge.

[0006] The root section includes a root section structure, a root section flange and a root section joint. The root section structure as a whole is a square column platform structure. The root section flange is welded to the bottom of the root section structure, and four root section joints are welded to the upper end of the root section structure. The root section is connected to the lower section standard section through the root section joint with a bolt group, and is connected to the root through the root section flange with a bolt group.

[0007] The lower section standard section includes a lower section standard section structure and a lower section standard section joint. The lower section standard section structure is a square column structure as a whole. Eight groups of lower section standard section joints are welded at both ends of the lower section standard section structure respectively. The bottom of the lower section standard section is connected to the root section through the lower section standard section joint with a bolt group, and its upper end is connected to the transition section or the lower section standard section through the lower section standard section joint with a bolt group.

[0008] The transition section is a symmetrically arranged upper and lower structure, including an upper cross bar, a lower cross bar, an outer chord, an inner chord, a connecting rod, a web, an upper joint and a lower joint. The upper end of the upper cross bar is welded to the upper joint, the lower end of the lower cross bar is welded to the lower joint, the inner chord and the outer chord are welded between the upper cross bar and the lower cross bar respectively, and the upper cross bar and the lower cross bar between the inner chords are welded by connecting rods; the upper end of the transition section is connected to the upper standard section, and the lower end is connected to the two lower standard sections; the upper and lower structures of the transition section are welded by a number of webs; the transition section is connected to the upper standard section through the upper joint, and is connected to the two lower standard sections through the lower joints.

[0009] Stiffening ribs are provided inside the upper cross bar and the lower cross bar. The stiffening ribs are stiffening circular plates or stiffening rectangular plates. The stiffening ribs are arranged in a transverse or longitudinal manner.

[0010] The upper cross bar, the lower cross bar, the outer chord bar, the inner chord bar, the connecting rod and the web bar are all made of round tubes.

[0011] The upper standard section includes an upper standard section structure and an upper standard section joint. The upper standard section structure is a square column structure as a whole. Eight groups of upper standard section joints are welded at both ends of the upper standard section structure respectively. The bottom of the upper standard section is connected to the transition section by a bolt group through the upper standard section joint, and its upper end is connected to the head section by a bolt group through the upper standard section joint.

[0012] The head section includes a head section structure, a head section joint and a head cross beam. The head section structure as a whole is a square column structure. The head cross beam is welded to the top of the head section structure. A head section joint is welded to the lower part of the head section structure. The head section is connected to the upper standard section through the head section joint with a group of bolts.

[0013] The present invention also provides a mast crane, which is provided with the above-mentioned crane single-double combined boom structure.

[0014] Beneficial Effects: The present invention utilizes a single-double combined boom structure with a single boom at the upper section and double booms at the lower section. A transition joint is provided at the transition point between the single and double booms, resulting in improved lateral stability while avoiding the need for a connecting beam. Compared to a single-boom boom, the single-double boom structure offers improved lateral stability and is lighter than a double-boom structure, offering significant advantages in terms of technical feasibility, safety, and affordability. Each rod in the transition joint utilizes a circular tube cross-section, resulting in a symmetrical, compact structure and efficient force transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the arm support of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the root of the present invention;

[0017] Figure 3 It is a structural schematic diagram of the root section of the present invention;

[0018] Figure 4 This is a schematic structural diagram of the lower section standard component of the present invention;

[0019] Figure 5 It is a structural schematic diagram of the transition section of the present invention;

[0020] Figure 6 It is a cross-sectional schematic diagram of the transition section of the present invention;

[0021] Figure 7 This is a schematic structural diagram of the upper standard section of the present invention;

[0022] Figure 8 It is a structural schematic diagram of the head section of the present invention;

[0023] Figure 9 It is a structural schematic diagram of the whole machine of the present invention.

[0024] In the figure: 1. root; 2. root section; 3. lower section standard section; 4. transition section; 5. upper section standard section; 6. head section; 101. root crossbeam; 102. root hinge; 103. root flange; 201. root section structure; 202. root section flange; 203. root section joint; 301. lower section standard section structure; 302. lower section standard section joint; 401. upper crossbar; 402. lower crossbar; 403. outer chord; 404. inner chord; 405. connecting rod; 406. web member; 407. upper joint; 408. lower joint; 409. stiffening rib; 501. upper section standard section structure; 502. upper section standard section joint; 601. head section structure; 602. head section joint; 603. head crossbeam. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0026] like Figures 1-9 As shown, the present invention provides a single-double combination boom structure of a crane, including a boom lower section, a boom upper section and a transition section 4. The boom lower section is a double-arm structure with bilateral symmetry, and its upper section is a single-arm structure; the boom lower section is composed of a root 1, a root section 2 and a lower section standard section 3 connected in sequence, and the boom upper section is composed of an upper section standard section 5 and a head section 6 connected in sequence; the boom upper section and the boom lower section are connected by a transition section 4, and the transition point of the boom is selected at the golden section point. The overall structure is beautiful and the force is reasonable; the structure has good lateral stability and avoids the setting of a connecting beam.

[0027] The root 1 includes a root beam 101, a root hinge 102 and a root flange 103, and the root hinge 102 and the root flange 103 are respectively welded on both sides of the two ends of the root beam 101; the root 1 is connected to the root section 2 through the root flange 103 by a bolt group; the boom structure is fixed to the base through the root beam 101 and the root hinge 102; the root beam 101 can offset the horizontal load generated by the axial force of the root section 2 and facilitate the installation of the boom.

[0028] The root section 2 includes a root section structure 201, a root section flange 202 and a root section joint 203. The root section structure 201 is a square column platform structure as a whole. The root section flange 202 is welded to the bottom of the root section structure 201, and four root section joints 203 are welded to the upper end of the root section structure 201. The root section 2 is connected to the lower section standard section 3 through the root section joint 203 using a bolt group, and is connected to the root 1 through the root section flange 202 using a bolt group.

[0029] The lower standard section 3 includes a lower standard section structure 301 and a lower standard section joint 302. The lower standard section structure 301 is a square column structure as a whole. Eight groups of lower standard section joints 302 are welded to the two ends of the lower standard section structure 301 respectively; the bottom of the lower standard section 3 is connected to the root section 2 by a bolt group through the lower standard section joint 302, and its upper end is connected to the transition section 4 or the lower standard section 3 by a bolt group through the lower standard section joint 302; according to the lifting situation, one or more lower standard sections 3 can be set on one side. When one lower standard section 3 is set, the transition section 4 is located close to the arm root, which is similar to a single-arm structure; when multiple lower standard sections 3 are set, the transition section 4 is located close to the arm end, which is similar to a double-arm structure.

[0030] The transition section 4 is a two-piece structure with a symmetrical arrangement, including an upper crossbar 401, a lower crossbar 402, an outer chord 403, an inner chord 404, a connecting rod 405, a web 406, an upper joint 407 and a lower joint 408. In the single-piece structure, the upper end of the upper crossbar 401 is welded with an upper joint 407, the lower end of the lower crossbar 402 is welded with a lower joint 408, the inner chord 404 and the outer chord 403 are welded between the upper crossbar 401 and the lower crossbar 402, and the inner The upper cross bar 401 and the lower cross bar 402 between the chords 404 are welded with a connecting rod 405; the upper end of the transition section 4 is connected to the upper standard section 5, and the lower end is connected to the two lower standard sections 3; the upper and lower structures of the transition section 4 are welded with a number of web roots 406, and the transition section structure is symmetrically arranged, compact, and has reasonable force transmission; the transition section 4 is connected to the upper standard section 5 through the upper joint 407, and is connected to the two lower standard sections 3 through the lower joint 408.

[0031] Stiffening ribs 409 are provided inside the upper cross bar 401 and the lower cross bar 402. The stiffening ribs 409 are stiffening circular plates or stiffening rectangular plates. The stiffening ribs 409 are arranged horizontally or vertically. Under the load of the upper joint and the lower joint, the upper cross bar and the lower cross bar of the transition section are subjected to large local internal forces and stresses. The stiffening ribs can be used to strengthen the upper cross bar and the lower cross bar to prevent strength damage and local instability.

[0032] The upper crossbar 401, the lower crossbar 402, the outer chord 403, the inner chord 404, the connecting rod 405 and the web 406 all adopt circular tube cross-sections. The transition section structure is symmetrically arranged, compact in structure and reasonable in force transmission.

[0033] The upper standard section 5 includes an upper standard section structure 501 and an upper standard section joint 502. The upper standard section structure 501 is a square column structure as a whole. Eight groups of upper standard section joints 502 are welded to the two ends of the upper standard section structure 501 respectively; the bottom of the upper standard section 5 is connected to the transition section 4 by a bolt group through the upper standard section joint 502, and its upper end is connected to the head section 6 by a bolt group through the upper standard section joint 502.

[0034] The head section 6 includes a head section structure 601, a head section joint 602 and a head crossbeam 603. The head section structure 601 is a square column structure as a whole. The head crossbeam 603 is welded to the top of the head section structure 601. The head section joint 602 is welded to the lower part of the head section structure 601. The head section 6 is connected to the upper standard section 5 by a group of bolts through the head section joint 602.

[0035] The present invention also provides a mast crane, which is provided with the above-mentioned crane single-double combined boom structure.

[0036] The combined boom structure of the present invention features a double-arm lower section and a single-arm upper section. A transition section connects the upper and lower sections, providing excellent lateral stability while avoiding the need for a connecting beam. The boom as a whole takes on a "human" shape. When the transition section is near the base of the boom, it resembles a single-arm structure, while when it is near the end of the boom, it resembles a double-arm structure. Therefore, the single- and double-boom structure is somewhere between a single- and double-arm structure. The transition point of the boom is located at the golden section, resulting in an aesthetically pleasing overall structure and reasonable force distribution. Compared to a single-arm boom, the single- and double-boom structure offers greater lateral stability and is lighter than a double-arm boom.

[0037] The above embodiments of the present invention are merely illustrative and not exclusive, and all modifications within the scope of the present invention or equivalent to the scope of the present invention are encompassed by the present invention.

Claims

1. A crane single and double combined boom structure, characterized in that: The invention comprises a boom lower section, a boom upper section and a transition section (4); the boom lower section is a double-arm structure with bilateral symmetry, and the upper section is a single-arm structure; the boom lower section is composed of a root (1), a root section (2) and a lower section standard section (3) connected in sequence, and the boom upper section is composed of an upper section standard section (5) and a head section (6) connected in sequence; the boom upper section and the boom lower section are connected via a transition section (4).

2. The single-double combined boom structure of the crane according to claim 1, characterized in that: The root (1) comprises a root crossbeam (101), a root hinge seat (102) and a root flange (103); the root hinge seat (102) and the root flange (103) are respectively welded to the two sides of both ends of the root crossbeam (101); the root (1) is connected to the root section (2) by a bolt group via the root flange (103); and the boom structure is fixed to the base via the root crossbeam (101) and the root hinge seat (102).

3. The single-double combined boom structure of a crane according to claim 1, characterized in that: The root section (2) comprises a root section structure (201), a root section flange (202) and a root section joint (203); the root section structure (201) is a square column platform structure as a whole; the root section flange (202) is welded to the bottom of the root section structure (201); and four root section joints (203) are welded to the upper end of the root section structure (201); the root section (2) is connected to the lower standard section (3) via the root section joint (203) by means of a bolt group, and is connected to the root (1) via the root section flange (202) by means of a bolt group.

4. The single-double combined boom structure of a crane according to claim 1, characterized in that: The lower section standard section (3) comprises a lower section standard section structure (301) and a lower section standard section joint (302); the lower section standard section structure (301) is a square column structure as a whole; eight groups of lower section standard section joints (302) are respectively welded to the two ends of the lower section standard section structure (301); the bottom of the lower section standard section (3) is connected to the root section (2) by means of a bolt group through the lower section standard section joint (302); and the upper end thereof is connected to the transition section (4) or the lower section standard section (3) by means of a bolt group through the lower section standard section joint (302).

5. The single-double combined boom structure of a crane according to claim 1, characterized in that: The transition section (4) is a two-piece structure with upper and lower parts, which are symmetrically arranged, and includes an upper cross bar (401), a lower cross bar (402), an outer chord bar (403), an inner chord bar (404), a connecting rod (405), a web bar (406), an upper joint (407) and a lower joint (408). The upper end of the upper cross bar (401) is welded with the upper joint (407), the lower end of the lower cross bar (402) is welded with the lower joint (408), and the inner chord bar (404) and the lower chord bar (404) are respectively welded between the upper cross bar (401) and the lower cross bar (402). The upper cross bar (401) and the lower cross bar (402) between the outer chord (403) and the inner chord (404) are welded by connecting rods (405); the upper end of the transition section (4) is connected to the upper standard section (5), and the lower end is connected to the two lower standard sections (3); the upper and lower structures of the transition section (4) are welded by a plurality of web bars (406); the transition section (4) is connected to the upper standard section (5) through an upper joint (407), and is respectively connected to the two lower standard sections (3) through a lower joint (408).

6. The single-double combined boom structure of a crane according to claim 5, characterized in that: Stiffening ribs (409) are arranged inside the upper cross bar (401) and the lower cross bar (402). The stiffening ribs (409) are stiffening circular plates or stiffening rectangular plates. The stiffening ribs (409) are arranged in a transverse or longitudinal manner.

7. The single-double combined boom structure of a crane according to claim 5, characterized in that: The upper cross bar (401), the lower cross bar (402), the outer chord bar (403), the inner chord bar (404), the connecting rod (405) and the web bar (406) are all made of round tubes.

8. The single-double combined boom structure of a crane according to claim 1, characterized in that: The upper standard section (5) comprises an upper standard section structure (501) and an upper standard section joint (502); the upper standard section structure (501) is a square column structure as a whole, and eight groups of upper standard section joints (502) are respectively welded to the two ends of the upper standard section structure (501); the bottom of the upper standard section (5) is connected to the transition section (4) by means of a bolt group through the upper standard section joint (502), and the upper end thereof is connected to the head section (6) by means of a bolt group through the upper standard section joint (502).

9. The single-double combined boom structure of a crane according to claim 1, characterized in that: The head section (6) comprises a head section structure (601), a head section joint (602) and a head cross beam (603); the head section structure (601) is a square column structure as a whole; the head cross beam (603) is welded to the top of the head section structure (601); a head section joint (602) is welded to the bottom of the head section structure (601); the head section (6) is connected to the upper standard section (5) by a bolt group via the head section joint (602).

10. A mast crane, characterized in that: A crane single-double combined boom structure is provided according to any one of claims 1 to 9.

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