Mast crane boom head multi-web box-shaped structure and mast crane

Abstract

The invention discloses a mast crane boom head multi-web box-shaped structure and a mast crane, the multi-web box-shaped structure comprises a main arm, an auxiliary arm, a head cross beam, a pin shaft, a lifting fixed pulley block, a lifting movable pulley block and a variable amplitude pull plate, the head cross beam is formed by welding an upper wing plate, a lower wing plate and a plurality of groups of webs; the head beam is integrally welded to the head of the main arm, and the auxiliary arm is fixed to the head beam through a pin shaft. The lifting fixed pulley block is directly arranged on the head cross beam of the boom, and the variable-amplitude pull plate is mounted on the head cross beam. The variable-amplitude pulling plate and the auxiliary arm share the cross beam web at the head of the main arm, and the structure is compact; the mast crane is not provided with a lifting pull plate and a movable pulley frame, and under the same lifting height, the length of the boom is shorter, and the lifting performance is better.

Description

Technical Field

[0001] The invention relates to a multi-web box-shaped structure at the head of a mast crane arm and a mast crane, belonging to the technical field of lifting machinery. Background Art

[0002] During the boom of a mast crane's swing and luffing process, the intersection of the plumb line of the lifted object and the axis of the luffing pull plate is not on the boom axis, causing the boom structure to bend. The bending moment decreases from the maximum linear moment to zero from the boom head to the boom root. In order to reduce the bending moment, the distance between the two hinge points of the boom head beam (the hinge point between the boom head beam and the lifting pull plate and the movable pulley frame, and the hinge point between the boom head beam and the luffing pull plate) is usually reduced, that is, the boom head structure is reduced. After the lifting fixed pulley block is fixed to the boom head, the lifting rope interferes with the boom structure during the boom's swing and luffing process. The resulting problem is that the lifting fixed pulley block cannot be arranged at the boom head, and a lifting pull plate and a movable pulley frame 10 must be provided for transition (such as Figure 1 As shown in the figure, the fixed lifting pulley block is installed at the lower end of the lifting plate and the movable pulley frame, and the upper end of the lifting plate and the movable pulley frame is fixed on the cross beam at the head of the boom. As the length of the lifting plate and the movable pulley frame is increased, the height of the fixed lifting pulley block is reduced, which leads to a decrease in the effective lifting height of the heavy object. The height difference must be compensated by increasing the arm length, increasing the arm length, adding the lifting plate and the movable pulley frame, and reducing the effective lifting height of the heavy object, that is, reducing the lifting height of the crane. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a multi-web box-shaped structure at the head of the boom crane, in order to solve the arrangement problem of the boom structure, lifting plate, movable pulley frame and lifting fixed pulley group existing in the prior art, so as to eliminate the lifting plate and movable pulley frame and enable the lifting fixed pulley group to be directly arranged on the cross beam of the boom head.

[0004] To solve this technical problem, the present invention provides a multi-web box-shaped structure at the head of a mast crane boom, comprising a main boom, a jib, a head crossbeam, a pin shaft, a lifting fixed pulley group, a lifting movable pulley group and a luffing pull plate, wherein the head crossbeam is welded by an upper wing plate, a lower wing plate and multiple groups of webs; the head crossbeam is integrally welded to the head of the main boom, and the jib is fixed to the head crossbeam by a pin shaft; the lifting fixed pulley group is directly arranged on the boom head crossbeam, and the luffing pull plate is installed on the head crossbeam.

[0005] The jib adopts a plate-tube hybrid structure, including a jib pull plate, a jib chord and a jib joint. The jib pull plate is a bent steel plate, the jib chord is a straight tube, and four groups of jib joints are respectively welded to the jib chord and the jib pull plate.

[0006] The upper wing plate is provided with slots corresponding to the number of the webs, and each web is provided with a boss. When the head beam is assembled and welded, the boss on the web is inserted into and passes through the slots on the web and is welded on the outer side of the upper wing plate.

[0007] The web is provided with a lifting shaft hole, and the lifting fixed pulley block is installed on the head cross beam through the lifting shaft hole.

[0008] The web is provided with an amplitude-changing shaft hole, and the amplitude-changing pull plate is installed on the head crossbeam through the amplitude-changing shaft hole.

[0009] The web is provided with a jib shaft hole, through which the jib is fixed to the head cross beam by a pin shaft.

[0010] The head of the main arm is provided with a stiffening rib, and the stiffening rib is provided with a plurality of pieces, which are respectively welded between the upper wing plate, the lower wing plate and the web plate, so that the upper wing plate, the lower wing plate and the web plate form a sealed box structure.

[0011] The present invention also provides a mast crane, wherein the mast crane is provided with the multi-web box structure described above.

[0012] Beneficial effects: The auxiliary arm of the present invention adopts a plate-tube hybrid structure, which reduces the manufacturing difficulty. The stiffening ribs are arranged at the head of the main arm, so that the lifting fixed pulley group, the variable-length pull plate and the auxiliary arm share the crossbeam web of the head of the main arm, and the structure is compact. Compared with the prior art, the present invention does not set a lifting pull plate and a movable pulley frame. At the same lifting height, the arm frame length is shorter and the lifting performance is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the traditional boom head structure;

[0014] Figure 2 This is a schematic diagram of the structure of the multi-ventral head of the boom of the present invention;

[0015] Figure 3 It is a structural schematic diagram of the auxiliary arm of the present invention;

[0016] Figure 4 It is a schematic diagram of the structure of the head cross beam of the present invention;

[0017] Figure 5 This is a schematic diagram of the structure of the upper wing plate of the crossbeam of the present invention;

[0018] Figure 6 It is a structural schematic diagram of the web of the crossbeam of the present invention;

[0019] Figure 7 It is a structural schematic diagram of the arm head of the present invention;

[0020] Figure 8 It is a schematic diagram of the assembly of the arm support head of the present invention.

[0021] In the figure: 1, main arm; 2, jib; 3, head cross beam; 4, pin shaft; 5, lifting fixed pulley block; 6, lifting movable pulley block; 7, luffing pull plate; 8, lifting rope; 10, lifting pull plate and movable pulley frame; 201, jib pull plate; 202, jib chord; 203, jib joint; 301, upper wing plate; 302, lower wing plate; 303, web plate; 304, jib shaft hole; 305, slot hole; 306, lifting shaft hole; 307, luffing shaft hole; 308, boss; 309, stiffening rib. DETAILED DESCRIPTION

[0022] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0023] like Figure 2-Figure 8 As shown, the present invention provides a multi-web box-shaped structure at the head of a mast crane jib, comprising a main arm 1, a jib 2, a head crossbeam 3, a pin 4, a lifting fixed pulley group 5, a lifting movable pulley group 6 and a luffing pull plate 7, wherein the head crossbeam 3 is welded by an upper wing plate 301, a lower wing plate 302 and a plurality of webs 303; the head crossbeam 3 is integrally welded to the head of the main arm 1, and the jib 2 is fixed to the head crossbeam 3 by a pin 4; the lifting fixed pulley group 5 is directly arranged on the jib head crossbeam 3, and the luffing pull plate 7 is installed on the head crossbeam 3.

[0024] The jib 2 adopts a plate-tube hybrid structure, including a jib pull plate 201, a jib chord 202 and a jib joint 203. The jib pull plate 201 is a bent steel plate, the jib chord 202 is a straight tube, and four groups of jib joints 203 are welded to the jib chord 202 and the jib pull plate 201 respectively. The jib 2 has no pipes arranged in a spatially inclined manner, and the weldment manufacturing process is simple, which reduces the manufacturing difficulty.

[0025] The upper wing plate 301 is provided with slots 305 corresponding to the number of the webs 303, and each web 303 is provided with a boss 308. When the head cross beam 3 is assembled and welded, the boss 308 on the web 303 is inserted into and passes through the slots 305 on the web 303, and is welded on the outer side of the upper wing plate 301, thereby solving the problem that multiple groups of webs 303 cannot be welded.

[0026] The web 303 is provided with a lifting shaft hole 306, and the lifting fixed pulley group 5 is directly installed on the head cross beam 3 through the lifting shaft hole 306. There is no need to use a lifting pull plate and a movable pulley frame 10, so there is no weight of the lifting pull plate and the movable pulley frame, and there is no height generated by the lifting pull plate and the movable pulley frame, which correspondingly increases the lifting height of the crane.

[0027] The web 303 is provided with a luffing shaft hole 307, and the luffing pull plate 7 is installed on the head cross beam 3 through the luffing shaft hole 307. The luffing pull plate 7 provides luffing power for the head cross beam 3 and its main arm 1, driving the main arm 1 to produce pitch swing luffing, and realizing the amplitude change of the crane. The luffing shaft hole 307 and the lifting shaft hole 306 are simultaneously provided on the web 303, so that the structure transmits force more directly. The load on the lifting fixed pulley block 5 is transmitted to the web 303 through the lifting shaft hole 306, and then transmitted to the luffing shaft hole 307 through the web 303, and finally transmitted to the luffing pull plate 7.

[0028] The web 303 is provided with a jib shaft hole 304, and the jib 2 is fixed to the head beam 3 through the jib shaft hole 304 using a pin 4, so that the head beam 3 can be connected to the lifting fixed pulley set 5, the variable-length pull plate 7 and the jib 2 at the same time, so the structure of the head beam 3 is more compact.

[0029] The head of the main arm 1 is provided with a stiffening rib 309, and the stiffening rib 309 is composed of multiple pieces, which are respectively welded between the upper wing plate 301, the lower wing plate 302 and the web 303, so that the upper wing plate 301, the lower wing plate 302 and the web 303 form a sealed box structure, thereby enhancing the strength of the head cross beam 3 and preventing local instability of the head cross beam 3.

[0030] The auxiliary arm of the present invention adopts a plate-tube hybrid structure, which reduces the manufacturing difficulty. The main arm head is equipped with stiffening ribs so that the lifting fixed pulley group, the variable-length pull plate and the auxiliary arm share the crossbeam web of the main arm head, and the structure is compact. Compared with the prior art, the present invention does not provide a lifting pull plate and a movable pulley frame. Under the same lifting height, the arm frame length is shorter and the lifting performance is better.

[0031] The present invention also provides a mast crane, wherein the mast crane is provided with the multi-web box structure described above.

[0032] The boom head of the present invention adopts a multi-web box structure, and a lifting shaft hole 306 and a variable-length shaft hole 307 are arranged on the web of the head cross beam 3. The width of the head cross beam is increased, that is, the spacing between the lifting shaft hole and the variable-length shaft hole is increased. This structure does not provide a lifting pull plate and a movable pulley frame. Under the same lifting height, the boom length is shorter and the lifting performance is better; the auxiliary arm 2 adopts a plate-tube hybrid structure, which reduces the manufacturing difficulty. The joints of the auxiliary arm 2 are connected with the help of the cross beam web, which not only ensures the effective fixation of the lifting fixed pulley group 5, but also makes the structure more reasonable and avoids the bending of the main arm head cross beam 3 under the action of the lifting load; the lifting fixed pulley group 5, the variable-length pull plate 7 and the auxiliary arm 2 share the cross beam web of the main arm head, and the structure is compact; the main arm head cross beam 3 structure adopts a boss extension method, which solves the process problem that the multi-web box is difficult to weld, and increases the cross-sectional height of the main arm head in the variable-length plane, effectively improving the main arm strength under dangerous working conditions.

[0033] 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 multi-web box structure at the head of a mast crane boom, characterized in that: The invention comprises a main arm (1), a jib (2), a head cross beam (3), a pin shaft (4), a lifting fixed pulley block (5), a lifting movable pulley block (6) and a luffing pull plate (7), wherein the head cross beam (3) is welded by an upper wing plate (301), a lower wing plate (302) and a plurality of web plates (303); the head cross beam (3) is integrally welded to the head of the main arm (1), and the jib (2) is fixed to the head cross beam (3) by a pin shaft (4); the lifting fixed pulley block (5) is directly arranged on the head cross beam (3) of the boom, and the luffing pull plate (7) is installed on the head cross beam (3).

2. The multi-web box structure of the mast crane boom head according to claim 1, characterized in that: The jib (2) adopts a plate-tube hybrid structure, comprising a jib pull plate (201), a jib chord (202) and a jib joint (203); the jib pull plate (201) is a bent steel plate, the jib chord (202) is a straight tube, and four groups of jib joints (203) are respectively welded to the jib chord (202) and the jib pull plate (201).

3. The multi-web box structure of the mast crane boom head according to claim 1, characterized in that: The upper wing plate (301) is provided with slots (305) corresponding in number to the web plate (303), and each web plate (303) is provided with a boss (308). When the head cross beam (3) is assembled and welded, the boss (308) on the web plate (303) is inserted into and passes through the slots (305) on the web plate (303), and is welded on the outer side of the upper wing plate (301).

4. The multi-web box structure of the mast crane boom head according to claim 1, characterized in that: The web (303) is provided with a lifting shaft hole (306), and the lifting fixed pulley block (5) is installed on the head cross beam (3) through the lifting shaft hole (306).

5. The multi-web box structure of the mast crane boom head according to claim 1, characterized in that: The web (303) is provided with an amplitude-changing shaft hole (307), and the amplitude-changing pull plate (7) is installed on the head crossbeam (3) through the amplitude-changing shaft hole (307).

6. The multi-web box structure of the mast crane boom head according to claim 1, characterized in that: The web (303) is provided with a jib shaft hole (304), and the jib (2) is fixed to the head cross beam (3) through the jib shaft hole (304) by a pin shaft (4).

7. The multi-web box structure at the head of a mast crane jib according to any one of claims 1 to 6, characterized in that: The head of the main arm (1) is provided with a stiffening rib (309), and the stiffening rib (309) is provided with a plurality of pieces, which are respectively welded between the upper wing plate (301), the lower wing plate (302) and the web plate (303), so that the upper wing plate (301), the lower wing plate (302) and the web plate (303) form a sealed box structure.

8. A mast crane, characterized in that: A multi-web box structure as described in any one of claims 1 to 7 is provided.

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