CN213679688U

CN213679688U - Polygonal arm support, telescopic arm and aerial work platform

Info

Publication number: CN213679688U
Application number: CN202022440440.2U
Authority: CN
Inventors: 龙冶国; 郑波; 刘波; 胡伟成; 刘龙
Original assignee: Hunan Zoomlion Intelligent Aerial Work Machinery Co Ltd
Current assignee: Hunan Zoomlion Intelligent Aerial Work Machinery Co Ltd
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2021-07-13
Anticipated expiration: 2030-10-28

Abstract

The utility model relates to an engineering machine tool field, concretely relates to polygon cantilever crane, telescopic boom and aerial working platform, wherein, the polygon cantilever crane is including being located upper cover portion (10) at the top of polygon cantilever crane, being located bottom plate portion (20) of the bottom of polygon cantilever crane and being located upper cover portion (10) with lateral part (30) between bottom plate portion (20), the thickness of lateral part (30) is less than upper cover portion (10) with the thickness of bottom plate portion (20). By arranging the side part with smaller thickness, the height of the polygonal arm support can be relatively increased, and the inertia moment of the cross section of the polygonal arm support is increased, so that the rigidity of the polygonal arm support is obviously increased.

Description

Polygonal arm support, telescopic arm and aerial work platform

Technical Field

The utility model relates to an engineering machine tool specifically relates to a polygon cantilever crane, telescopic boom and aerial working platform.

Background

The high-altitude operation equipment needs to ensure the safety and stability of the high-altitude operation of personnel. For example, for aerial work platforms, the stiffness requirements for the telescopic boom are high. Especially for high-altitude operation platforms with high-meter sections (generally over 42 meters), the requirement on the height of the arm support of the telescopic arm is higher. If the arm support with the same rigidity is used, the shaking amount of the high-altitude operation platform in the high-altitude section is much larger than that of the high-altitude operation platform in the low-altitude section, and the experience of operators is poor. At present, a telescopic boom adopts a rectangular boom, in order to improve the rigidity of the boom, the height, the width and the plate thickness of the boom are generally increased, which can increase the weight of the boom, further affect the stability of the whole high-altitude operation equipment and increase the manufacturing cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a polygon cantilever crane in order to overcome the great and problem that influences stability of weight of the high rigidity cantilever crane of problem that prior art exists, this polygon cantilever crane can compromise rigidity and improve and maintain stability.

In order to achieve the above object, an aspect of the present invention provides a polygonal arm support, wherein the polygonal arm support includes an upper cover portion located at the top of the polygonal arm support, a bottom plate portion located at the bottom of the polygonal arm support, and a side portion located between the upper cover portion and the bottom plate portion, the upper cover portion includes a first plate portion and a first bending portion bent downward from both sides of the first plate portion, the bottom plate portion includes a second plate portion and a second bending portion bent upward from both sides of the second plate portion, the side portion extends vertically from the first bending portion to the second bending portion, and the thickness of the side portion is smaller than the thickness of the upper cover portion and the thickness of the bottom plate portion.

Optionally, the side portion, the upper cover portion and the bottom plate portion are all equal-thickness plates.

Optionally, the polygonal arm support includes a first slider disposed inside the first bending portion and a second slider disposed inside the second bending portion.

Optionally, the second bent portion includes a vertical edge vertically disposed and an inclined edge connecting the vertical edge and the second flat plate portion.

Optionally, an included angle a between the inclined edge and the second plate portion is 135-165 °; and/or the ratio L2/L3 of the length L2 of the second plate part to the length L3 of the inclined edge is 1-3.

Optionally, the polygonal arm support includes a cover plate, a bottom plate and a web plate, the cover plate forms the upper cover portion, the bottom plate forms the bottom plate portion, the web plate forms the side portion, and two ends of the web plate are respectively welded to the cover plate and the bottom plate.

Optionally, the cover plate is an equal-thickness plate, and the bottom plate is an equal-thickness plate.

Optionally, the polygonal arm support comprises a cover plate and a base plate, the cover plate forms the upper cover part and a first side part connected to the upper cover part, the base plate forms the base plate part and a second side part connected to the base plate part, and the first side part and the second side part are welded to each other to form the side part.

Optionally, the first side portion and the second side portion are welded on a neutral layer of the polygonal arm support.

Optionally, a bending plate for increasing rigidity is disposed on an outer surface of the side portion, and the bending plate and the outer surface of the side portion enclose a closed frame.

The application further provides a telescopic boom, wherein the telescopic boom comprises the polygonal boom support.

The application also provides an aerial work platform, wherein, aerial work platform includes the telescopic boom of this application.

Optionally, the aerial work platform is a high-altitude work platform in a high-altitude section.

Through the technical scheme, the side part with smaller thickness is arranged, so that the height of the polygonal arm support can be relatively increased, the inertia moment of the polygonal arm support is increased, and the rigidity of the polygonal arm support is obviously increased.

Drawings

FIG. 1 is a schematic cross-sectional view of one embodiment of a polygonal boom according to the present application;

FIG. 2 is a schematic cross-sectional view of the side and bottom plate portions of FIG. 1;

FIG. 3 is a cross-sectional schematic view of another embodiment of a polygonal boom according to the present application;

fig. 4 is a schematic cross-sectional view of another embodiment of a polygonal boom according to the present application.

Description of the reference numerals

10-upper cover part, 11-first flat plate part, 12-first bent part, 20-bottom plate part, 21-second flat plate part, 22-second bent part, 221-vertical edge, 222-inclined edge, 30-side part, 31-first side part, 32-second side part, 40-first sliding block, 50-second sliding block, 60-cover plate, 70-bottom plate, 80-web plate, 90-bent plate and S-third sliding block.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

In this application, where the contrary is not stated, the use of directional words such as "upper, lower, left and right" generally means upper, lower, left and right as illustrated with reference to the accompanying drawings; "inner and outer" refer to the inner and outer relative to the profile of the components themselves. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

According to an aspect of the present application, a polygonal boom is provided, wherein the polygonal boom includes an upper cover portion 10 located at the top of the polygonal boom, a bottom plate portion 20 located at the bottom of the polygonal boom, and a side portion 30 located between the upper cover portion 10 and the bottom plate portion 20, the upper cover portion 10 includes a first flat plate portion 11 and a first bent portion 12 bent downward from two sides of the first flat plate portion 11, the bottom plate portion 20 includes a second flat plate portion 21 and a second bent portion 22 bent upward and obliquely from two sides of the second flat plate portion 21, the side portion 30 vertically extends from the first bent portion 12 to the second bent portion 22, and a thickness of the side portion 30 is smaller than thicknesses of the upper cover portion 10 and the bottom plate portion 20.

According to the polygonal arm support, on the premise that the weight is not increased (namely, on the premise that the sectional areas of the polygonal arm support are the same), the height of the polygonal arm support can be relatively increased by arranging the side part 30 with the smaller thickness, the inertia moment of the cross section of the polygonal arm support is increased, and therefore the rigidity of the polygonal arm support is remarkably increased.

Specifically, when the height and width dimensions of the polygonal boom are not limited, in the case of the same polygonal boom sectional area, the thickness of the side portion 30 is smaller, so that the distance between the upper cover portion 10 and the bottom plate portion 20 (i.e., the height of the side portion 30) is set to be larger, thereby increasing the moment arm (h in the following formula) of the upper cover portion 10 and the bottom plate portion 20, according to the vertical moment of inertia formula: i is_l＝∫h²dA, it is known that the vertical moment of inertia is significantly increased and the rigidity is increased.

When the height and width dimensions of the polygonal boom are limited, under the condition of the same polygonal boom cross section area, the thickness of the side part 30 is smaller, so that the cross section area of the side part is smaller, the cross section areas of the upper cover part 10 and the bottom plate part 20 are relatively increased, and due to the width limitation, the increase of the cross section areas of the upper cover part 10 and the bottom plate part 20 is realized by increasing the thicknesses of the upper cover part 10 and the bottom plate part 20, so that the overall rigidity of the polygonal boom is also increased.

Regardless of whether the height and width dimensions of the polygonal boom are limited, it can be seen from the above analysis that the effect of increasing the rigidity can be obtained by making the thickness of the side portions 30 smaller than the thickness of the upper lid portion 10 and the bottom plate portion 20. Meanwhile, the sectional area of the polygonal arm support is not changed, so that the weight and the production cost of the polygonal arm support are not additionally increased, and the stability of the whole machine is not influenced.

In order to ensure the uniform performance of the polygonal arm support at the respective cross sections of the upper cover part 10, the bottom plate part 20 and the side part 30, the upper cover part 10 and the bottom plate part 20 are all equal-thickness plates.

In addition, in order to form the telescopic boom by assembling a plurality of polygonal boom frames, it is necessary to provide a slider on the polygonal boom frame, and the slider is mounted on a portion having a large plate thickness in order to ensure stable mounting of the slider. For this purpose, the polygonal arm support includes a first slider 40 disposed inside the first bending portion 12 and a second slider 50 disposed inside the second bending portion 22. By having the first slider 40 and the second slider 50 disposed inside the first bent portion 12 and the second bent portion 22, respectively, a firm mounting can be provided by the first bent portion 12 and the second bent portion 22, which are relatively thick.

In addition, the bottom plate part 20 is provided to have a structure of being bent obliquely, thereby forming a polygonal cross-sectional structure of the polygonal arm support to improve the buckling performance. Specifically, as shown in fig. 2, the second bent portion 22 includes a vertical side 221 vertically disposed and an inclined side 222 connecting the vertical side 221 and the second plate portion 21. The specific parameters of the second bending portion 22 can be set to further increase the contribution of the bottom plate portion 20 to the improvement of the rigidity of the polygonal arm support.

Specifically, the contribution of the bottom plate portion 20 to the rigidity can be changed by setting the angle a of the inclined edge 222 with respect to the second plate portion 21, the length L3 of the inclined edge 222, and the length L2 of the second plate portion 21.

Wherein, along with the increase of included angle a, the height of bottom plate portion 20 reduces, and the height of lateral part 30 will increase, but when the height of bottom plate portion 20 reduces to a certain extent, for the sectional area of guaranteeing the polygon cantilever crane is unchangeable, the thickness of bottom plate portion 20 will increase for the height of lateral part 30 reduces. Thus, as the included angle A increases, the height of the side portion 30 increases and then decreases. Furthermore, when the included angle a increases to 180 °, the cross section of the polygonal arm will change from polygonal to rectangular, while the buckling performance of the rectangular cross section is inferior to that of the polygonal arm, so that the included angle a should be avoided from being too large. For this purpose, the angle a between the inclined edge 222 and the second plate portion 21 is 135-165 °. Preferably, the included angle A is 150-160 deg..

Furthermore, the stiffness of the polygonal arm support can also be changed by adjusting the length L3 of the inclined edge 222 and the length L2 of the second plate portion 21. Specifically, when the width and height of the polygonal arm support are not limited, under the condition that the sectional area of the polygonal arm support is not changed, as L2/L3 is increased, the height h1 of the side portion 30 is increased, the height h2 of the second plate portion 21 is decreased, and the rigidity of the polygonal arm support is increased and then decreased. When the width and height of the polygonal arm support are limited, under the condition that the sectional area of the polygonal arm support is not changed, as L2/L3 is increased, L2 is increased, and the rigidity of the polygonal arm support is increased.

It will be appreciated that the increase in the length L2 of the second plate portion 21 will cause the length L3 of the inclined edge 222 to be shortened, and the third slider S is required to be mounted at the inclined edge 222, and the limit length of L3 for mounting the third slider S cannot be shorter than the width of the third slider S.

Therefore, in consideration of various factors, it is preferable that the ratio L2/L3 of the length L3 of the inclined side 222 to the length L2 of the second plate portion 21 is 1 to 3, preferably 1.5 to 2.

The present application may be embodied in various specific forms. For example, in the embodiment shown in fig. 1 and 2, the polygonal arm support includes a cover plate 60, a bottom plate 70 and a web 80, the cover plate 60 forms the upper cover portion 10, the bottom plate 70 forms the bottom plate portion 20, the web 80 forms the side portion 30, and two ends of the web 80 are respectively welded to the cover plate 60 and the bottom plate 70. Wherein, the cover plate 60 and the bottom plate 70 can be both equal thick plates.

Alternatively, in the embodiment shown in fig. 3, the polygonal arm support may include a cover plate 60 and a base plate 70, the cover plate 60 forms the upper cover part 10 and a first side part 31 connected to the upper cover part 10, the base plate 70 forms the base plate part 20 and a second side part 32 connected to the base plate part 20, and the first side part 31 and the second side part 32 are welded to each other to form the side part 30. Wherein the first side portion 31 and the second side portion 32 can be provided with an extension height according to requirements. Preferably, the first side portion 31 and the second side portion 32 are welded on a neutral layer of the polygonal arm support (i.e. a layer which is neither in tension nor in compression and has substantially zero stress on the section of the polygonal arm support), so that the stress of the welding seam is improved, and the fatigue life of the welding seam is prolonged.

In addition, to further increase the rigidity, as shown in fig. 4, a bending plate 90 for increasing the rigidity may be disposed on an outer surface of the side portion 30, and the bending plate 90 and the outer surface of the side portion 30 form a closed frame. The shape of the closed frame can be trapezoid, rectangle, semicircle, etc.

Compared with the rectangular arm support with the height section of more than 40 meters in the prior art, the polygonal arm support has the advantages that the rigidity can be obviously improved, and the rigidity limit of the rectangular arm support is broken through. For example, in the height range of 50-60m, compared with the rectangular arm support in the prior art, the polygonal arm support has the advantages that the vertical rigidity can be improved by 20-25%, the vertical shaking is reduced by 1200mm, the lateral rigidity can be improved by 12-17%, and the lateral shaking is reduced by 300-450 mm.

According to another aspect of the present application, there is provided a telescopic boom, wherein the telescopic boom comprises the polygonal boom of the present application.

By arranging the side part 30 with smaller thickness, the height of the polygonal arm support can be relatively increased, and the force arm of each point on the cross section of the polygonal arm support is increased, so that the rigidity of the polygonal arm support is obviously increased. Thus, the height of the telescopic arm of the present application can be significantly increased.

According to another aspect of the present application there is provided an aerial work platform, wherein the aerial work platform comprises a telescopic boom of the present application. Preferably, the aerial work platform is a high-meter-section aerial work platform.

By using the high-rigidity telescopic arm, the requirements on the safety and the stability of the aerial work platform can be met, and the high-rigidity telescopic arm is particularly suitable for the requirements of the aerial work platform in a high-altitude section.

In addition, under the condition of the same rigidity, the aerial work platform using the polygonal arm support can reduce the weight by 3-5t compared with the aerial work platform using the existing rectangular arm support.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. In the technical idea scope of the present invention, it is possible to provide a solution of the present invention with a plurality of simple modifications to avoid unnecessary repetition, and the present invention is not described separately for various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims

1. The polygonal arm support is characterized by comprising an upper cover part (10) positioned at the top of the polygonal arm support, a bottom plate part (20) positioned at the bottom of the polygonal arm support and a side part (30) positioned between the upper cover part (10) and the bottom plate part (20), the upper cover part (10) comprises a first flat plate part (11) and a first bending part (12) which is bent downwards from two sides of the first flat plate part (11), the bottom plate portion (20) includes a second plate portion (21) and second bent portions (22) bent obliquely upward from both sides of the second plate portion (21), the side portion (30) extending vertically from the first folded portion (12) to the second folded portion (22), the side portion (30) has a thickness smaller than the thicknesses of the upper lid portion (10) and the bottom plate portion (20).

2. Polygonal arm support according to claim 1, characterized in that the sides (30), the upper cover part (10) and the bottom plate part (20) are all equal-thickness plates.

3. The polygonal arm support according to claim 1, comprising a first slider (40) arranged inside the first bent portion (12) and a second slider (50) arranged inside the second bent portion (22).

4. The polygonal arm support according to claim 1, wherein the second bent portion (22) comprises a vertically arranged vertical side (221) and a slanted side (222) connecting the vertical side (221) and the second plate portion (21).

5. The polygonal arm support according to claim 4, wherein the included angle A between the inclined edge (222) and the second plate portion (21) is 135-165 °; and/or the ratio L2/L3 of the length L2 of the second plate part (21) to the length L3 of the inclined edge (222) is 1-3.

6. The polygonal arm support according to any one of claims 1 to 5, wherein the polygonal arm support comprises a cover plate (60), a base plate (70) and a web (80), wherein the cover plate (60) forms the upper cover portion (10), the base plate (70) forms the base plate portion (20), the web (80) forms the side portion (30), and two ends of the web (80) are respectively welded with the cover plate (60) and the base plate (70).

7. The polygonal arm support according to claim 6, wherein the cover plate (60) is of equal thickness and the base plate (70) is of equal thickness.

8. Polygonal boom according to any one of claims 1-5, characterized in that the polygonal boom comprises a cover plate (60) and a base plate (70), the cover plate (60) forming the upper cover part (10) and a first side part (31) connected to the upper cover part (10), the base plate (70) forming the base plate part (20) and a second side part (32) connected to the base plate part (20), the first side part (31) and the second side part (32) being welded to each other to form the side part (30).

9. The polygonal boom according to claim 8, characterized in that the first side (31) and the second side (32) are welded at a neutral layer of the polygonal boom.

10. The polygonal arm support according to any one of claims 1 to 5, wherein a bending plate (90) for increasing rigidity is provided on the outer surface of the side portion (30), and the bending plate (90) and the outer surface of the side portion (30) enclose a closed frame.

11. A telescopic boom, characterized in that it comprises a polygonal boom according to any of claims 1-10.

12. An aerial work platform comprising the telescopic boom of claim 11.

13. An aerial work platform as claimed in claim 12 wherein the aerial work platform is a high metre section aerial work platform.