Telescopic boom and mobile crane

Abstract

The invention relates to a telescopic boom comprising a coupling section, on the side of which at least two luffing-cylinder mounts are provided for fastening luffing cylinders to the telescopic boom. The bearing plates of the luffing-cylinder mount transition into a metal-plate box structure, the metal-plate box structure being composed of three partial luffing-cylinder boxes.

Claims

1. A telescopic boom comprising a coupling section with at least two luffing-cylinder mounts for fastening luffing cylinders to the telescopic boom, wherein bearing plates of each luffing-cylinder mount transition into a metal-plate box structure for transferring load from each luffing-cylinder mount into of the telescopic boom, wherein the metal-plate box structure comprises three partial luffing-cylinder boxes, of which two partial luffing-cylinder boxes are arranged substantially below side walls so as to be opposite one another in a lateral region of a lower shell of the coupling section and parallel with the coupling section, while a third partial luffing-cylinder box extends transversely to the coupling section.

2. The telescopic boom according to claim 1, wherein the three partial luffing-cylinder boxes are each box structures comprising two side walls, a cover plate, and an end plate.

3. The telescopic boom according to claim 1, wherein the third partial luffing-cylinder box adjoins each end of the two partial luffing-cylinder boxes which are opposite an end having the at least two luffing-cylinder mounts.

4. The telescopic boom according to claim 3, wherein the third partial luffing-cylinder box is welded to the two partial luffing-cylinder boxes.

5. The telescopic boom according to claim 4, wherein metal plates of the two substantially parallel partial luffing-cylinder boxes penetrate metal plates of the third partial luffing-cylinder box at least in part.

6. The telescopic boom according to claim 1, wherein at least one buckling strut formed on the lower shell only extends as far as the third partial luffing-cylinder box, which extends transversely to the coupling section.

7. The telescopic boom according to claim 6, wherein the at least one buckling strut formed on the lower shell is welded to a partial luffing-cylinder box of the two partial luffing-cylinder boxes.

8. The telescopic boom according to claim 1, wherein an additional metal-plate box structure interconnects the two partial luffing-cylinder boxes, which are arranged in parallel with one another, below the lower shell.

9. The telescopic boom according to claim 8, wherein the additional metal-plate box structure is connected to the lower shell section in a center thereof between the two partial luffing-cylinder boxes adjacent thereto.

10. The telescopic boom of claim 1, wherein the at least two luffing-cylinder mounts are bolt mounts.

11. A crane or a mobile crane, comprising a telescopic boom, the telescopic boom comprising: a coupling section, on a side of which at least two luffing-cylinder mounts are provided for fastening luffing cylinders to the telescopic boom, and bearing plates of each luffing-cylinder mount transition into a metal-plate box structure for transferring load from the respective luffing-cylinder mount into the telescopic boom, wherein the metal-plate box structure is composed of three partial luffing-cylinder boxes, of which two partial luffing-cylinder boxes are arranged substantially below side walls of the coupling section so as to be opposite one another in a lateral region of a lower shell in parallel with the coupling section, while a third partial luffing-cylinder box extends transversely to the coupling section.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) Further features, details and advantages of the invention will become apparent from the following detailed description of a preferred embodiment, which is explained with reference to the accompanying drawings, in which:

(2) FIG. 1 is a view of a detail of a telescopic boom according to the prior art,

(3) FIG. 2A is a side view of the coupling section according to FIG. 1,

(4) FIG. 2B is a side view of an embodiment of the coupling section according to the invention,

(5) FIG. 3 is a perspective view of a detail of the coupling section,

(6) FIG. 4 is a side view of the detail of the coupling section according to FIG. 3,

(7) FIG. 5A is a view from below of the detail of the coupling section according to FIG. 3,

(8) FIG. 5B is a view corresponding to FIG. 5A, with the cover plates of the partial luffing cylinders being omitted in part, and

(9) FIG. 6 is a front view of the view of a detail according to FIG. 3.

DETAILED DESCRIPTION

(10) FIG. 2B shows a coupling section 1 of a telescopic boom according to an embodiment of the present invention. Here, lateral luffing-cylinder mounts 33 in the form of bolt mounts are provided as force-introduction points. Luffing cylinders (not shown in greater detail here), which, in a known manner, serve to move the telescopic boom up and down, are articulated to said luffing-cylinder mounts 33.

(11) In the present case, corresponding luffing-cylinder mounts 33 are provided on each side, since this is a large crane. The bearing plates 71 of the luffing-cylinder mounts transition into a metal-plate box structure 3, which serves to transfer load from the luffing-cylinder mount 33 into the structure of the telescopic boom.

(12) The more precise structure of the metal-plate box structure is explained with reference to FIGS. 3, 4, 5A, 5B and 6. Accordingly, the metal-plate box structure 3 is composed of three partial luffing-cylinder boxes 40, 50, 60, of which two partial luffing-cylinder boxes 40, 50 are arranged substantially below the side walls 11 so as to be opposite one another in the lateral region 72 of the lower shell 73 of the coupling section 1 in parallel with the coupling section 1 (cf. in particular FIG. 6).

(13) Furthermore, a third partial luffing-cylinder box 60 is arranged transversely to the coupling section 1, as shown in FIG. 3, for example. The partial luffing-cylinder boxes 40, 50 introduce the majority of the forces into the rigid profiled web walls 11 of the coupling section 1. This takes place over the two web plates 41, 42 (cf. FIG. 3). Here, the higher plate, which extends to the outer wall, as shown here, may also consist of a plurality of partial plates 41, 41′ (cf. FIG. 4). The two partial luffing-cylinder boxes 40, 50 constitute closed boxes and comprise cover plates 43, 44. Corresponding end plates 74 are also provided.

(14) A partial luffing-cylinder box 60 extends transversely to the boom section 1. It also comprises web plates 61, 62. Cover plates 63 are also provided in order to produce a closed box structure here too.

(15) In FIG. 5B, most of the cover plates are hidden, such that it can be seen that the partial luffing-cylinder boxes 40, 60 penetrate the partial luffing-cylinder boxes 50, 60 in part. Therefore, after welding the two partial luffing-cylinder boxes 40 and 60, the web plate 42 continues in the partial luffing-cylinder box 60 by means of a web plate 42′.

(16) FIG. 3 shows in detail that buckling struts 12, 13 that extend in parallel and are provided in the coupling section 1 end at the partial luffing-cylinder box 60 and are welded thereto. A continuing buckling strut 12, 13 in the region of the lulling-cylinder box is not necessary, since the box itself provides sufficient stability against buckling.

(17) FIG. 3 and also FIG. 6 in particular show that another metal-plate box structure 70 is additionally provided as a stabilizing additional box. It is also a box-shaped metal-plate box structure which is completely closed. Side plates and cover plates are also provided. This metal-plate box structure 70 rigidifies the entire metal-plate box structure 3 and interconnects the two partial lulling-cylinder boxes 40, 50. In the center M, it is connected to the comparatively soft lower shell of the coupling section 1, which can be seen in FIG. 6. This connection is only indented into the lower shell to a negligible extent. Essentially, the two luffing-cylinder mounts 33, i.e. the force-introduction points, are braced against one another. Furthermore, stabilizing forces can also be absorbed by the lower shell perpendicularly to the longitudinal axis of the coupling section 1. The lower shell has a particularly high load capacity in this direction.