CN2714524Y

CN2714524Y - Crane boom

Info

Publication number: CN2714524Y
Application number: CN 200420035755
Authority: CN
Inventors: 张建军; 黎伟福
Original assignee: Puyuan Branch Of Changsha Zoomlion Heavy Industry Technology Development Co ltd
Current assignee: Puyuan Branch Of Changsha Zoomlion Heavy Industry Technology Development Co ltd
Priority date: 2004-04-30
Filing date: 2004-04-30
Publication date: 2005-08-03
Anticipated expiration: 2014-04-30

Abstract

The utility model discloses a crane boom, and is characterized in that the cross-section of the boom is a hexagonal trapezoid with a big rounded corner; the trapezoid is formed by a lower cover plate (1) and an upper cover plate (2), the ratio of the height and the width is h2:H=1. 1-1. 6, and the lower cover plate (1) is formed by a horizontal section (8) and two stages of the sloped section (9, 10). The degree of an included angle alpha of the horizontal section (8) and the sloped section (9, 10) ranges from25 degrees to 40 degrees, and the ratio of the cross section width and the length of the horizontal section (8) of the lower cover plate (1) is H:h1=3. 5-6. 5; the upper cover plate (2) comprises a top plate (3) and bilateral web plate (4, 5), and the degree of the included angle beta of the top plate 3 and the web plate (4, 5) ranges from92 degrees to100 degrees . The utility model is a crane boom, with the advantages of light dead weigh, good hoisting performance, simple structure, convenient manufacture and low cost; besides, the stress is evenly distributed.

Description

A kind of hoisting crane arm

Technical field

The utility model relates to a kind of hoisting crane arm.

Background technology

Arm is the vitals of car hosit, is the key of hoisting crane performance quality.The version of arm also is diversified, and quadrangle, trapezoidal, hexagon, octagon are arranged, and each arm all has characteristics separately, and domestic main arm section form is quadrangle and hexagon at present.When the car hosit hoisting capacity reaches certain tonnage; Tradition arm shape has just seriously restricted the lifting performance of car hosit, and the one, the version decision arm own wt of traditional arm is big, influences lifting performance; The 2nd, the version of traditional arm can't make section stress be tending towards rectangular distribution, and local stress is bigger, and existing material is difficult to meet the demands.

When the version of telescopic boom crane arm had determined the arm stand under load, the stress on the cross section was made up of two parts, integrally bending stress, local bending stress.Wherein the integrally bending distribution of stress is on whole cross section, and local bending stress only appears near the lower cover, the arm of conventional cross-section (quadrangle and hexagon) neutral line is substantially near the cross section geometric center, when it made the arm stand under load, the stress at the stress amplitude ratio upper cover plate place at lower cover place was twice above.In order to satisfy the stress requirement at lower cover place, have only: the thickness of slab that, increases lower cover; Two, improving the intensity rank of lower cover material, also is that whole arm cross section upper stress distributed pole is unreasonable, does not give full play to the mechanical characteristics of material, causes arm weight big, influences lifting performance.

The utility model content

Technical problem to be solved in the utility model provide a kind of distribution of stress evenly, from heavy and light, hoisting crane arm that lifting performance is good.

In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of hoisting crane arm, it is characterized in that: it is trapezoidal that its cross section consists of big fillet hexagon by lower cover and upper cover plate, its height and the ratio of its width: h2: H=1.1～1.6, described lower cover is made up of horizontal segment and two sections tilting sections, angle α=25 of horizontal segment and tilting section °～40 °, the ratio of section width and the horizontal section length of lower cover: H: h1=3.5～6.5, described upper cover plate is made up of the web of top board and both sides, angle β=92 of top board and web °～100 °.

As a kind of improvement of the present utility model, two jiaos of places are provided with tilt prop respectively in the bottom, cross section, and it is to distance h 3=30～50 in the outside, cross section.

Hoisting crane adopts the arm of technique scheme, and fully court moves down away from the cross section geometric center can to make the cross section neutral line.When it makes the arm stand under load, with regard to integrally bending stress, the stress amplitude ratio bottom on top, cross section want big, lower cover place in bottom, cross section adds local bending stress like this, makes that the combined stresses on the whole arm cross section is tending towards even.It can give full play to the mechanical characteristics of arm material, and material use is very reasonable, and arm is in light weight, and hoisting capacity is big.

Two jiaos of places add tilt prop in the bottom, cross section, the one, make the kernel of section layer further towards moving down, the 2nd, increase by a constraint, reduce lower cover should the place because local extruding and issuable distortion reduces the local bending stress value.Make the cross section more reasonable, distribution of stress is more even.

In sum, the utility model be a kind of distribution of stress evenly, from heavy and light, arm that lifting performance is good and simple in structure, easily manufactured, with low cost.

Description of drawings

Accompanying drawing is the utility model structural representation.

The specific embodiment

Referring to accompanying drawing, it is trapezoidal that the arm cross section consists of big fillet hexagon by lower cover 1 and upper cover plate 2, its height and the ratio of its width: h2: H=1.1～1.6, described lower cover 1 is by horizontal segment 8 and two sections tilting sections 9,10 form, horizontal segment 8 and tilting section 9,10 angle α=25 °～40 °, the length ratio of the horizontal segment 8 of section width and lower cover 1: H: h1=3.5～6.5, described upper cover plate 2 is by the web 4 of top board 3 and both sides, 5 form, top board 3 and web 4,5 angle β=92 °～100 °, two jiaos of places are provided with tilt prop 6 respectively in the bottom, cross section, 7, it is to distance h 3=30～50 in the outside, cross section.

Claims

1, a kind of hoisting crane arm, it is characterized in that: it is trapezoidal that its cross section consists of big fillet hexagon by lower cover (1) and upper cover plate (2), its height and the ratio of its width: h2: H=1.1～1.6, described lower cover (1) is by horizontal segment (8) and two sections tilting sections (9,10) form, horizontal segment (8) and tilting section (9,10) angle α=25 °～40 °, the length ratio of the horizontal segment (8) of section width and lower cover (1): H: h1=3.5～6.5, described upper cover plate (2) is by the web (4 of top board (3) and both sides, 5) form top board 3 and web (4,5) angle β=92 °～100 °.

2, a kind of hoisting crane arm according to claim 1 is characterized in that: two jiaos of places are provided with tilt prop (6,7) respectively in the bottom, cross section, and it is to distance h 3=30～50 in the outside, cross section.