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US-12623889-B2 - Supporting construction

US12623889B2US 12623889 B2US12623889 B2US 12623889B2US-12623889-B2

Abstract

Supporting construction ( 10 ) for a working machine comprising a mast, having a supporting leg box ( 12 ), which is open to a front side ( 16 ), and having a supporting leg ( 20 ) which is mounted displaceably in the longitudinal direction for moving between a completely retracted position and a position in which it is completely extended by a maximum extension length (A), wherein the supporting leg box ( 12 ) has, in the region of the open front side ( 16 ), a first load introduction device ( 30 ) and, at a given distance (D) from the front side ( 16 ), within the supporting leg box, a single second load introduction device ( 32 ) having at least one supporting surface ( 34 ), and wherein the supporting leg ( 20 ) has a reinforcing element ( 36 ) which extends substantially along a length (L) of the supporting leg ( 20 ) and which is designed to bear on the at least one supporting surface ( 34 ) of the single second load introduction device ( 32 ).

Inventors

  • Matthias Braun

Assignees

  • PUTZMEISTER ENGINEERING GMBH

Dates

Publication Date
20260512
Application Date
20220316
Priority Date
20210318

Claims (18)

  1. 1 . A supporting construction ( 10 ) for a work machine comprising a mast, a supporting leg box ( 12 ) which is open to a front side ( 16 ), and a supporting leg ( 20 ) slidingly movable in the supporting leg box ( 12 ) in a longitudinal direction ( 22 ) between a fully retracted position and a position in which it is fully extended from the supporting leg box ( 12 ) by a maximum extension length (A), wherein the supporting leg box ( 12 ) comprises a first load introduction device ( 30 ) in an area of its open front side ( 16 ), and a single second load introduction device ( 32 ) having at least one supporting surface ( 34 ) arranged within the supporting leg box at a given distance (D) from the front side ( 16 ), the single second load introduction device ( 32 ) passing through one or more through-aperture(s) in a wall of the supporting leg box ( 12 ) and projecting with respect to an inner surface of the supporting leg box ( 12 ), and wherein the supporting leg ( 20 ) comprises a reinforcing element ( 36 ) extending along a length (L) of the supporting leg ( 20 ) and which rests on the at least one supporting surface ( 34 ) of the single second load introduction device ( 32 ).
  2. 2 . The supporting construction ( 10 ) of claim 1 , wherein the first load introduction device ( 30 ) in the area of the open front side ( 16 ) is a reinforcement of an upper flange ( 50 ) or a reinforcement of at least one web plate ( 54 ) of the supporting leg box ( 12 ).
  3. 3 . The supporting construction ( 10 ) of claim 1 , wherein the single second load introduction device ( 32 ) is a reinforcement of a lower flange ( 52 ) or a reinforcement of at least one web plate ( 54 ) of the supporting leg box ( 12 ).
  4. 4 . The supporting construction ( 10 ) of claim 1 , wherein the given distance (D) corresponds substantially to the length (L) of the supporting leg ( 20 ) minus the maximum extension length (A).
  5. 5 . The supporting construction ( 10 ) of claim 1 , wherein the reinforcing element ( 36 ) acts on the first load introduction device ( 30 ).
  6. 6 . The supporting construction ( 10 ) of claim 1 , wherein the single second load introduction device ( 32 ) is of multi-part design.
  7. 7 . The supporting construction ( 10 ) of claim 1 , wherein the single second load introduction device ( 32 ) comprises a supporting surface ( 34 ) which extends transversely to the longitudinal direction ( 22 ).
  8. 8 . The supporting construction ( 10 ) of claim 1 , wherein the single second load introduction device ( 32 ) comprises a plurality of supporting surfaces ( 34 ) distributed over a periphery of the supporting leg box ( 12 ), at the given distance (D) from the front side ( 16 ).
  9. 9 . The supporting construction ( 10 ) of claim 7 , wherein the supporting surface ( 34 ) is formed on a lower flange ( 52 ) or on web plates ( 54 ).
  10. 10 . The supporting construction ( 10 ) of claim 1 , wherein the supporting surface ( 34 ) extends at an angle of 90° to the longitudinal direction ( 22 ), or in which the supporting surface ( 34 ) extends at an angle not equal to 90° to the longitudinal direction ( 22 ).
  11. 11 . The supporting construction ( 10 ) of claim 1 , wherein a transverse extension of the single second load introduction device ( 32 ) extends parallel to a front side of the first load introduction device ( 30 ) or in which a transverse extension of the single second load introduction device ( 32 ) does not have the same orientation as the front side of the first load introduction device ( 30 ).
  12. 12 . The supporting construction ( 10 ) of claim 1 , wherein the given distance (D) in the longitudinal direction ( 22 ) is determined along a central axis of the supporting leg box ( 12 ) from a front side of the first load introduction device ( 30 ) to an intersection of the central axis with a transverse extension of the single second load introduction device ( 32 ).
  13. 13 . The supporting construction ( 10 ) of claim 1 , wherein the single second load introduction device ( 32 ) is a substantially U-shaped bracket which is open at the top.
  14. 14 . The supporting construction ( 10 ) of claim 1 , wherein the single second load introduction device ( 32 ) is a reinforcement of a lower flange ( 52 ) or a reinforcement of web plates ( 54 ) of the supporting leg box.
  15. 15 . A supporting construction ( 10 ) for a work machine comprising a mast, a supporting leg box ( 12 ) which is open to a front side ( 16 ), and a supporting leg ( 20 ) slidingly movable in the supporting leg box ( 12 ) in a longitudinal direction ( 22 ) between a fully retracted position and a position in which it is fully extended from the supporting leg box ( 12 ) by a maximum extension length (A), wherein the supporting leg box ( 12 ) comprises a first load introduction device ( 30 ) in an area of its open front side ( 16 ), and a single second load introduction device ( 32 ) in the form of a substantially U-shaped bracket which is open in a direction facing the supporting leg ( 20 ), said single second load introduction device ( 32 ) having at least one supporting surface ( 34 ) arranged within the supporting leg box at a given distance (D) from the front side ( 16 ), and wherein the supporting leg ( 20 ) comprises a reinforcing element ( 36 ) extending along a length (L) of the supporting leg ( 20 ) and which rests on the at least one supporting surface ( 34 ) of the single second load introduction device ( 32 ).
  16. 16 . A supporting construction ( 10 ) for a work machine comprising a mast, a supporting leg box ( 12 ) which is open to a front side ( 16 ), and a supporting leg ( 20 ) slidingly movable in the supporting leg box ( 12 ) in a longitudinal direction ( 22 ) between a fully retracted position and a position in which it is fully extended from the supporting leg box ( 12 ) by a maximum extension length (A), wherein the supporting leg box ( 12 ) comprises a first load introduction device ( 30 ) in an area of its open front side ( 16 ), and a second load introduction device ( 32 ) having a supporting surface ( 34 ) arranged within the supporting leg box at a given distance (D) from the front side ( 16 ), said second load introduction device ( 32 ) projecting inwardly from opposite side webs ( 54 ) of the supporting leg box ( 12 ), and wherein the supporting leg ( 20 ) comprises a reinforcing element ( 36 ) projecting outwardly from first and second side web plates ( 64 ) of the supporting leg ( 20 ), said reinforcing element ( 36 ) extending along a length (L) of the supporting leg ( 20 ) and which rests on the supporting surface ( 34 ) of the second load introduction device ( 32 ).
  17. 17 . The supporting construction ( 10 ) claim 16 , wherein the second load introduction device ( 32 ) extends through an opening in the first and second side web plates ( 54 ).
  18. 18 . The supporting construction ( 10 ) of claim 17 , wherein the second load introduction device ( 32 ) is configured to end in a plane with an outside surface of the side webs ( 54 ) of the supporting leg box ( 12 ).

Description

TECHNICAL FIELD The present invention relates to a supporting construction for a work machine, in particular a work machine having a mast. BACKGROUND Supporting constructions of the type stated at the outset are used to support work machines provided with a mast, in particular a boom arrangement comprising a plurality of mast arms. When the mast is not in operation, supporting legs of the supporting construction are moved into a supporting leg box in a space-saving manner, ensuring that they do not protrude or protrude only slightly when the machine is being moved to another location. When the work machine, for example a mobile concrete pump, is in operation, the extended supporting leg often has to absorb large forces, which are transmitted via the supporting leg box and directed onto the ground. In this context, the force is generally transmitted from the supporting leg box to the supporting leg at two points: the supporting leg rests on the top of the supporting leg box in the region or area of the opening of the latter, and at its rear end is supported in the supporting leg box, on the bottom thereof. Known supporting legs have a hollow body, at the end of which that protrudes from the supporting leg box a supporting foot projects downward. The hollow body is composed of vertically oriented web plates and horizontally oriented flange plates. To prevent the supporting leg from buckling at the points where the force is introduced from the supporting leg box, the supporting leg must be designed to be particularly stable at these points. This is generally achieved by welding transverse diaphragms into the supporting leg, which means that the supporting leg can only be used in those settings in which the force is introduced in the region of the transverse diaphragms. This reduces the number of possible settings of the supporting leg. In most cases, the work machine can only be operated with the supporting leg fully extended, half extended or not extended at all. Installing a multiplicity of transverse diaphragms in the supporting leg would disadvantageously increase the weight thereof. DE 10 2014 014 038 A1 discloses a supporting construction of the type in question in which the web plates of the supporting legs are exposed and form lower and upper bearing surfaces, and the supporting legs rest with the downward-facing narrow sides of the web plates on two supporting strips in the supporting leg box, which extend in the longitudinal direction at a distance from one another. DE 20 2004 011 443 U1 discloses a supporting device for load bearing structures with projecting loads, in which upper load introduction blocks are provided on an inner side of the supporting leg box in the area of its opening, and lower load introduction blocks, which are arranged in a fixed manner in the interior of the supporting leg box, are provided at a distance from the upper blocks. Load introduction blocks are screwed on or bolted. SUMMARY OF THE INVENTION Proceeding from this, the proposal according to the invention is for a supporting construction having the features of claim 1. The invention is based on the insight of providing a single load introduction point in the interior of the supporting leg box, combined with a reinforcement, extending substantially over the entire length of the supporting leg or the extendable leg, for the purpose of support on the single load introduction point. According to the invention, structurally simple and low-cost load introduction with force flow optimization is thus provided. The combination of a single load introduction point in the supporting leg box (in addition to the upper-flange load introduction provided at an open end of the supporting leg box) and a continuous reinforcement in the supporting leg to be extended allows support with a large number of leg settings (i.e. different extension lengths), right up to full flexibility. This allows more flexible utilization capabilities of the work machine equipped with the supporting construction according to the invention. The invention thus relates to a supporting construction for a work machine that has a mast, having a supporting leg box, which is open to a front side, and having a supporting leg, which is mounted in the supporting leg box so as to be movable in the longitudinal direction for movement between a fully retracted position and a position in which it is fully extended by a maximum extension length, wherein a first load introduction device and a single second load introduction device are provided in or on the supporting leg box, the first load introduction device for absorbing a force that is to be dissipated upward in the supporting leg box during operation and the single second load introduction device for absorbing a force to be dissipated downward in the supporting leg box during operation, and wherein the supporting leg has a reinforcing element extending substantially over a length of the supporting leg and which is designe