EP3251998B1 - Boom profile for the boom of a telescopic crane - Google Patents

Description

The invention relates to a boom profile for the boom of a telescopic crane, with lower and upper shell, wherein the lower and upper shell are welded together and wherein the weld extends between the lower and upper shell at least in an area angled to at least one profile edge of the boom profile.

EP1090875 A1 discloses a boom profile according to the preamble of claim 1.

Boom profiles of telescopic cranes can be known to consist of an upper shell and a lower shell, which can be connected by means of a extending over the entire length of the profile weld. These upper and lower shells can already consist of several sheets themselves, where shocks can extend both transversely and longitudinally to the boom profile. This design is characterized in that the components of the upper and lower shell are made of rectangular sheets and that the connecting weld or the connecting welds of the upper and lower shell parallel to the profile edges of the boom profile. This is due to the fact that non-planar areas of the boom profile or of the upper shell and lower shell can be difficult to weld together.

A disadvantage of the boom profiles known from the prior art is that the lower and upper shells welded together parallel to their profile edges along the entire length of the boom profile or along a part of the boom profile have a constant cross-section, while the loading introduced into the boom profile depends changed from the position on the boom profile and the force acting on the boom overall.

As a result, known boom profiles in some areas over-dimensioned cross-sectional profiles, while the same cross-sectional profiles can be undersized in other areas of the boom profile for correspondingly larger moments occurring there. For safe or stable design of the boom profiles, it is disadvantageously known to perform this so that the strength of the lower and upper shells along the entire profile length is sufficiently large to accommodate the largest torque occurring on the boom profile dimensioned. This results in the result that in areas of the boom profile with lower loads introduced a significant oversizing of the boom profile occurs and thus unnecessarily much material is installed and correspondingly excessive costs and weight in the production of appropriate boom profiles arise.

Against this background, it is an object of the invention to provide a boom profile, which is better adapted to the occurring along the boom profile different sized loads and which can be made with less material use.

This object is achieved by a boom profile with the features of claim 1. Advantageous embodiments are the subject of the dependent claims. Accordingly, a boom profile with lower and upper shell is provided, wherein lower and upper shell are welded together and wherein the weld extends between the lower and upper shell at least in an area angled to at least one profile edge of the boom profile.

The angled course of the weld here means a course that is not parallel to the profile edges. Due to the angled arrangement of the weld or the welds between the lower and upper shell, it is possible to produce lower and upper shell of components that have no constant dimensions along the longitudinal axis of the boom profile. In particular, for example, an optionally thicker executed lower shell occupy a larger area of the cross section of the boom profile in areas in which particularly large loads on the lower shell of the boom profile, while in areas of the boom profile, in which lower loads on the boom profile or on the lower shell act the strength or thicker performed lower shell can take a smaller share of the cross section of the boom profile.

In contrast, in these areas, a thin shell designed as a lower shell can occupy a larger proportion of the cross section of the boom profile. A correspondingly oblique weld seam or correspondingly oblique weld seams thus make it possible to produce boom profiles with heterogeneous mechanical properties along the profile length, which are adapted to the different load scenarios occurring along their longitudinal axes. In this way, in particular, the amount of material for providing a boom profile with a defined rigidity can be reduced. Conversely, with the same material use, the permissible load of the corresponding telescopic boom can be increased.

The term profile edges here may include any non-planar structures of the boom profile and in particular substantially longitudinal edges or correspondingly extending bending edges of the boom profile. The boom profile may have a polygonal and / or rounded cross-sectional area perpendicular to the longitudinal direction of the boom profile. In particular, the outer contours of the cross-sectional area of the boom profile may be polygonal and / or rounded.

The term of the weld is presently not restrictive to a single weld between the lower and upper shell, but it can also a plurality of welds, in particular two welds occur. These may be arranged on opposite sides of the boom profile and in particular run symmetrically to each other.

In a preferred embodiment of the invention, it is conceivable that the lower shell has a greater thickness than the upper shell. Advantageously, occurring on the thicker lower shell higher compression forces or bending moments, which vary along the length of the boom profile, are absorbed by the lower shell, without the lower shell is over-dimensioned in sections for the corresponding occurring loads and thus an overall over-sized boom profile is present.

In a further preferred embodiment, it is also conceivable that the lower shell rises in accordance with the torque curve in the boom profile. With the rise of the lower shell is meant that it occupies a larger cross-sectional portion at the cross section of the boom profile ascending from bottom to top when looking sideways the boom profile. If, for example, a linear increase in the load or the torque introduced occurs at the boom profile in question, then the weld seam can correspondingly increase linearly along the boom profile.

In a further preferred embodiment, it is conceivable that the weld seam between the lower and upper shell runs along the entire cantilever profile at a constant or varying angle to the profile edges of the cantilever profile and / or curved. Alternatively, it is also conceivable that the weld between the lower and upper shell runs along a part of the boom profile at a constant or varying angle to the profile edges of the boom profile and / or curved. Along another part or other parts of the boom profile, the weld between the lower and upper shells may be parallel to the profile edges of the boom profile. They are also free or approximate free weld seams conceivable, which make it possible to enter particularly easily constructive structures such as Verbolzungselemente or other loads on the boom profile. Receivers for these structures can be made stronger by means of a lower shell which engages more strongly and / or occupies a larger part of the cross section of the boom profile. The edges of the lower and upper shell are manufactured in such a way that they can correspond to each other or can be welded together without gaps. For this purpose, an edge of a lower shell may be formed as a negative of the edge of an upper shell welded to it. This also applies to angled, as for parallel and / or curved with respect to the profile edges of the boom profile extending welds.

In a preferred embodiment, it is also conceivable that lower and upper shell are welded together by a laser hybrid method. Such methods make it particularly easy to produce non-planar welding seams, which can be welded accordingly over, for example, longitudinally or angled running bending edges of the boom profile. Alternatively or additionally, other welding methods are also conceivable by means of which a corresponding non-planar weld seam can be produced in particular automatically.

The invention further relates to a boom for a telescopic crane with at least one boom profile according to one of claims 1 to 7 and a telescopic crane with at least one boom profile according to one of claims 1 to 7.

Figuren 1, 2:

unterschiedliche Ansichten eines Auslegerprofils gemäß dem Stand der Technik;

Figuren 3, 4:

unterschiedliche Ansichten des erfindungsgemäßen Auslegerprofils mit über die gesamte Profillänge ansteigender Schweißnaht;

Figuren 5, 6:

unterschiedliche Ansichten erfindungsgemäßer Auslegerprofile mit abknickenden Schweißnähten;

Figur 7:

unterschiedliche Ansichten des erfindungsgemäßen Auslegerprofils mit frei verlaufender Schweißnaht; und

Figur 8:

unterschiedliche Ansichten des erfindungsgemäßen Auslegerprofils mit gebogen verlaufender Schweißnaht.

Further details and advantages of the invention are shown by way of exemplary embodiments illustrated in the figures. Showing:

Figures 1, 2:

different views of a boom profile according to the prior art;

FIGS. 3, 4:

different views of the boom profile according to the invention with over the entire profile length rising weld;

FIGS. 5, 6:

different views of inventive boom profiles with kinking welds;

FIG. 7:

different views of the boom profile according to the invention with free-running weld; and

FIG. 8:

different views of the boom profile according to the invention with bent extending weld.

FIG. 1 shows a known from the prior art boom profile of the boom of a telescopic crane with lower 2 and upper shell 1, wherein lower 2 and upper shell 1 by means of a running over the entire profile length weld 3 are welded together. As in the FIGS. 1 and 2 can be seen, the weld 3 runs parallel to a profile edge 4 of the boom profile.

Figures 3 and 4 show an inventive running at an angle weld 3, which may have a constant angle to the profile edge 4 and profile edges 4 over the entire length of the boom profile. The angled running weld 3 can be referred to as shock.

By modern welding processes, such as Laserhybridverfahren that is in the FIGS. 3 to 7 welding shown over profile edges 4 away or the welding of non-planar welds possible. The weld 3 can now no longer run parallel to the profile edges 4 and instead run on curved surfaces of the boom profile and / or across edges. The optionally thicker lower shell 2 of the telescopic profile or the boom profile may increase in accordance with the torque curve. It is also conceivable, however, a construction with initially rising or angled profile profile or weld seam course and in the further course of a parallel orientation of the Weld 3 to the profile edges 4 of the boom profile, as shown in FIG. 5 is shown. In the rear or in the FIG. 5 The right-hand area of the boom profile can be the clamping area of the boom profile in which the boom profile is clamped in a different boom profile or in another clamping device.

Figures 2 and 4 to 8 show different weld types in more detailed views. In this case, in the upper region of the figures mentioned, the respective metal sheets or lower and upper shells 1 are shown in unwinding. 2 and upper shell 1 are each shown in a planar plan view and without the need for the completion of the lower and upper shell 2 longitudinal profile edges, that is unwound.

Side views of the respective cantilever profiles are shown in the central areas of said figures, with additional terminations being visible at the ends of the cantilever profiles.

In the lower areas of said figures, sectional views are shown at the corresponding locations of the boom profiles. It can be seen that the lower shells 2 are usually designed to be stronger than the corresponding upper shells 1. With stronger execution here, the sheet thickness of the corresponding component may be meant. The dashed vertical lines indicate in which region the respective cuts are arranged or which region of the corresponding boom profile they represent.

The sectional views show embodiments of the boom profiles, in which the lower shells 2 have a rounded cross-section. Conceivable, however, are all other cross sections that meet the requirements of the corresponding telescopic crane.

The boom profiles according to the invention can be manufactured so that in a first step it is determined which loads along the boom profile occur. In a next step, it is determined which profile thicknesses or material thicknesses are necessary for absorbing these loads along the longitudinal course of the boom profile. In a next step, the geometry of suitable for receiving the calculated loads lower and upper shells 2, 1 is determined and the thus defined lower and upper shells 1 1 are made of suitable semi-finished. In a further step, welding takes place by means of, in particular, a laser hybrid method of sub-2 and upper shell 1. Additional steps, in particular for the preparation or reworking of the boom profiles or also further intermediate steps between the main steps mentioned above, can of course also be incurred.

FIG. 7 shows a weld 3 with a free course, in which by welding seam guide particularly strong areas to be performed 5 can be formed by a correspondingly enhanced executed lower shell 2, which forms the areas 5 and which is arranged in the areas 5. The strongly executable areas 5 may be, for example, sections at which force is introduced into the boom profile.

FIG. 8 shows similar to Figures 3 and 4 an inventively angled running weld 3, which is not linear over the entire length of the boom profile, but at least partially curved. To better illustrate the curvature of the weld 3, a straight line is shown and highlighted with two oppositely directed arrows, the distance between the straight line and weld 3 at certain points. The weld seams 3 of all embodiments shown may be provided laterally on the boom profiles, usually on the left and right of the boom profile depending on a weld 3 may be provided. The two welds 3 a Ausleberprofils can be symmetrical or not symmetrical to each other.

Claims (9)

1. A boom profile for the boom of a telescopic crane, having a lower shell (2) and an upper shell (1), wherein the lower shell (2) and the upper shell (1) are welded together, and characterized in that the weld seam between the lower shell (2) and the upper shell (1) extends at least in one region at an angle to at least one profile edge of the boom profile.
2. The boom profile in accordance with claim 1, characterized in that the lower shell (2) has a larger thickness than the upper shell (1).
3. The boom profile in accordance with claim 1 or claim 2, characterized in that the lower shell (2) increases in accordance with the torque progression in the boom profile.
4. The boom profile in accordance with claim 1, 2 or 3, characterized in that the weld seam between the lower shell (2) and the upper shell (1) extends along the whole boom profile at a constant or varying angle to the profile edges of the boom profile, and/or in a curved manner.
5. The boom profile in accordance with claim 1, 2 or 3, characterized in that the weld seam between the lower shell (2) and the upper shell (1) extends along a part of the boom profile at a constant or varying angle to the profile edges of the boom profile, and/or in a curved manner.
6. The boom profile in accordance with claim 5, characterized in that the weld seam between the lower shell (2) and the upper shell (1) extends along a part of the boom profile in parallel with the profile edges of the boom profile.
7. The boom profile in accordance with one of the preceding claims, characterized in that the lower shell (2) and the upper shell (1) are welded to one another by a laser hybrid process.
8. A boom for a telescopic crane having at least one boom profile in accordance with one of the claims 1 to 7.
9. A telescopic crane having at least one boom profile in accordance with one of the claims 1 to 7.

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