EP3556718B1 - Concrete pump vehicle - Google Patents

Description

The invention relates to a truck-mounted concrete pump with at least one rear pivoting leg and at least one front pivoting leg, the front pivoting leg comprising a leg box and at least one inner part that can be telescoped thereto, and the rear pivoting leg comprising an outer part with an upper and a lower leg, between which the inner part of the front swivel leg can be stored in a telescoping and swiveled-in state.

State-of-the-art truck-mounted concrete pumps typically include pivoting legs for supporting the truck-mounted concrete pump in a working condition. In the working state of the truck-mounted concrete pump, a placing boom of the truck-mounted concrete pump can be extended and concrete can be placed in a construction site area, for example, by means of the concrete pump and the placing boom. Depending on the design, the swivel legs of the truck-mounted concrete pump can be arranged or combined in different ways.

As an example, document discloses DE 20 2007 018214 U1 a concrete pump according to the preamble of claim 1.

Due to the compact design, a retracted and pivoted front telescopic leg or swivel leg of a truck-mounted concrete pump is required in one Driving condition of the machine usually space in the rear pivoting leg or space in the area of a recess in the rear pivoting leg. The space requirement depends on the length of the pivoting legs and the design of the truck-mounted concrete pump's mast bracket.

For this reason, the rear swivel legs of all truck-mounted concrete pumps that are similar to those in the EP 1 090 195 B1 correspond to the type shown, in the joint areas very long, openings. The two legs of the opening act as a bending beam when the corresponding pivot leg is loaded. This opening proves to be unfavorable for dissipating the loads of the placing boom acting on the rear swivel legs during pumping operation into the subsoil, since the load-bearing cross-sections in the area of the opening can only have very small cross-sections for geometric reasons, which is caused by comparatively large wall thicknesses in the corresponding areas must be balanced. Correspondingly, large material thicknesses are sometimes used for the respective components according to the prior art, which compensate for the necessarily smaller cross sections in the region of the swivel leg openings. This happens at the expense of the manufacturing costs and the component weight of corresponding truck-mounted concrete pumps. The components mentioned can be made of steel and/or other materials.

Against this background, the object of the invention is to provide an improved truck-mounted concrete pump in which, in particular, lower production costs and a lower component weight are achieved by correspondingly improving the structure of the pivoting legs.

According to the invention, this object is achieved by a truck-mounted concrete pump with the features of claim 1 . Advantageous configurations are the subject matter of the dependent claims.

Accordingly, a truck-mounted concrete pump is provided with at least one rear pivoting leg and at least one front pivoting leg, the front Pivoting leg comprises a leg box and at least one inner part telescopic thereto. It is also conceivable that the pivoting legs are designed to be telescopic several times.

The rear pivoting leg comprises an outer part with an upper and a lower leg between which the inner part of the front pivoting leg can be stored in a telescoped and pivoted state. According to the invention, it is provided that the two legs are coupled to one another by means of at least one diagonal reinforcement on the outside of the rear pivoting leg. According to the invention, exactly one diagonal bracing can of course also be provided.

The idea on which the invention is based is therefore to connect the lower leg of the rear pivoting leg on its outside diagonally from a lower hinge point of the rear pivoting leg to the leg-side end of the upper leg and/or in the opposite direction. In this way a very stable, truss-like triangle is created. As a result, the rear swivel leg can be stiffened with relatively little outlay on material and thus in a way that saves weight and costs. The outside of the rear swing leg is the side not penetrated by the telescopic leg when angling the front and rear legs toward each other to support the machine.

This takes advantage of the fact that the swivel legs of mobile concrete pumps are primarily loaded in one direction. A tensile load on the underside of the swivel leg is the predominant load in pump operation or in the working condition of the truck-mounted concrete pump. Due to the diagonal bracing of the opening between the upper and the lower leg of the rear swivel leg, the lower leg of the opening in particular is significantly relieved of bending and the entire opening area can thus advantageously be made lighter.

In a preferred embodiment of the invention it is conceivable that the two legs in the height direction at least in sections or over their entirety Length are coupled solely by the diagonal bracing. This means that in the described sections of the rear pivoting leg, the diagonal bracing is the sole connection of the legs and no other connecting means or connections are provided. Of course, a pivot axis can be provided at the ends of the legs, about which the pivoting leg is or both pivoting legs can be pivoted and which inevitably represents a further, albeit different, type of connection between the two legs.

In a further preferred embodiment it is conceivable that the diagonal bracing extends to an innermost section of one of the legs. This innermost portion may include the portion of the leg in which the pivot axis of the leg is located and which is the portion of the pivot leg closest to the truck-mounted concrete pump.

In a further preferred embodiment it is conceivable that the diagonal bracing extends up to a pivot axis of the rear pivot leg. As mentioned, the pivot axis can be arranged in the area of the innermost section of the pivot leg and set up to pivot the pivot leg relative to the truck-mounted concrete pump.

In a further preferred embodiment, it is conceivable that a U-shaped, triangular or polygonal opening is formed between the legs, which is open in particular to the outside. Thus, between the legs, an arcuate or angular area can form the outer part of the opening. The opening itself can be aligned horizontally, so that the inner part of the front pivoting leg can be pushed at least partially into the opening of the rear pivoting leg. For example, with a U-shaped opening, the radius of the opening may be between one-fourth and one-half the height of the rear pivot leg.

In a further preferred embodiment it is conceivable that the inner part of the front pivoting leg is framed by the legs and the diagonal bracing of the rear pivoting leg in its telescoped state. The legs and the diagonal bracing thus at least partially enclose the inner part of the pivoting leg in the telescoped-in state. The inner part of the swivel leg or the inner telescoping part can be visible from the outside in the telescoped state through recesses in the area of the outer part.

In a further preferred embodiment it is conceivable that the diagonal bracing is at least as long as the distance between the two legs and/or at most twice as long as one of the legs. In the shortest version, the diagonal bracing is just as long as the distance between the two legs. The diagonal bracing can thus be arranged perpendicularly to the legs. The concept of diagonal bracing is therefore not to be understood as limiting. It is alternatively or additionally conceivable that the diagonal bracing extends at least half and at most twice as far in the height direction as one of the legs.

In a further preferred embodiment, it is conceivable that the diagonal reinforcement has at least partially a constant profile in its longitudinal direction and/or has a greater length than width. The diagonal stiffener can thus be designed as a part that is elongated overall.

It can also be provided that not just a single but at least two diagonal stiffeners are provided on the rear swivel leg. The diagonal braces may be located on opposite sides of the pivot leg or on the same side of the pivot leg.

Figur 1:

eine schematische Ansicht einer erfindungsgemäßen Autobetonpumpe; und

Figur 2:

eine schematische Ansicht einer aus dem Stand der Technik bekannten Betonpumpe.

Further details and advantages of the invention are explained using the exemplary embodiments shown in the figures. show:

Figure 1:

a schematic view of a truck-mounted concrete pump according to the invention; and

Figure 2:

a schematic view of a concrete pump known from the prior art.

figure 1 shows a truck-mounted concrete pump 1 according to the invention with a placing boom 10, via which concrete can be transported or pumped from a concrete mixer to a placement site.

The placing boom 10 is coupled to the rest of the structure of the truck-mounted concrete pump 1 via a boom bracket 11 . The truck-mounted concrete pump according to figure 1 comprises two front pivoting legs 3 and two rear pivoting legs 2, the front pivoting legs 3 being able to comprise an in particular closed leg box 26. In the side view of figure 1 a front swivel leg 3 and a rear swivel leg 2 of the right side of the truck-mounted concrete pump 1 are shown. On the left side of the truck-mounted concrete pump, which is not shown, there can be two mirror-inverted pivoting legs 2, 3.

The truck-mounted concrete pump 1 can be designed as a truck 27 or as a working device with a driver's cab 27'.

The truck-mounted concrete pump 1 comprises at least one rear pivoting leg 2 with an outer part 21. The front pivoting leg 3 has a leg box 26 in which an inner part 22 is slidably or telescopically mounted. The outer part 21 of the rear pivoting leg 2 comprises an upper leg 211 and a lower leg 212. Between the two legs 211, 212, the inner part 22 of the front pivoting leg 3 is in a figure 1 Can be stored in the telescoped and pivoted-in state shown. The inner part 22 of the front swivel leg 3 can also be referred to as a telescopic leg 22 .

According to the invention, it is provided that the two legs 211, 212 are coupled to one another by means of at least one diagonal stiffener 213.

The two legs 211, 212 define an opening 24 together with a rounded or angular section. The two legs 211, 212 run in the longitudinal direction of the pivoting leg between the curved or angular area of the opening 24 and the pivot axis 23. The pivot axis 23 is set up for this purpose to pivot the pivoting legs 2, 3 relative to the truck-mounted concrete pump 1. It is conceivable that both pivoting legs 2, 3 can be pivoted relative to the rest of the structure of the truck-mounted concrete pump 1 via a common bolt or a corresponding common pivot axis 23.

The two legs 211, 212 are in the height direction or in the vertical direction in the figure 1 shown embodiment coupled over its entire length solely by the diagonal brace 213. Only the pivot axis 23, which is arranged in the innermost area of the pivot leg 2, can be regarded as an additional coupling. The pivot axis 23 can be made movable relative to the components of the pivot leg 2 mentioned, while the legs 211, 212 and the diagonal reinforcement 213 can be made in one piece and/or cannot be adjusted relative to one another or can be rigid. It is conceivable to provide or cover the side area or intermediate space defined by the legs 211, 212 together with the diagonal reinforcement 213 with a cover plate.

The legs 211, 212 and/or the diagonal stiffener 213 can be designed in one piece with one another, for example as burnt-out metal elements or as a single sheet. In addition or as an alternative, materials other than metals can also be used. It is conceivable that the diagonal reinforcement 213 is produced, for example, as a strut made of a metallic or non-metallic material such as a fiber composite material (eg based on carbon). This strut can be screwed and/or bolted to the legs 211, 212 and be set up in particular to absorb tensile loads.

In the embodiment of figure 1 the diagonal stiffener 213 runs from the outside above, that is to say in the figure at the top left, to the inside below, that is to say in the figure at the bottom right. This results in a Z- or S-shaped stiffening. An alternative or additional reverse arrangement of the diagonal bracing is also conceivable. In any case, the diagonal bracing 213 can run on a single side of the rear pivoting leg 2 so that the diagonal bracing 213 cannot collide with the inner part 22 of the front pivoting leg 3 .

In an embodiment with a plurality of diagonal reinforcements 213, these can run in the same way or differently from one another. Thus, several diagonal reinforcements 213 can be arranged parallel to one another or crossed and/or can be provided on opposite sides of the rear pivoting leg 2 . The reinforcements can thus be X-shaped or K-shaped.

The pivot axis 23 is arranged in an innermost portion of the legs 211, 212 and the diagonal stiffener 213 can extend to this innermost region. As can be seen from the figures, an opening 24 extends between the two legs 211, 212, which is diagonally and partially covered by the diagonal reinforcement 213.

As figure 1 can also be seen that the inner part 22 of the front pivoting leg 3 in the telescoped state shown therein can be bordered by the legs 211, 212 at the top and bottom and by the diagonal reinforcement 213 and/or guided therein. It can also be seen that the legs 211, 212 and the diagonal stiffener 213 extend approximately the same distance in the vertical direction or in the height direction, or that the components mentioned are manufactured to approximately the same thickness in the vertical direction.

Furthermore, it is conceivable that the acute angles 25 between the legs 211, 212 and the diagonal stiffener 213 are filled with reinforcing means which reduce the stress in the areas of these angles 25. It is conceivable that the transition areas of the diagonal reinforcement 213 to the legs 211, 212 are rounded or are made with fillets, whereby their dynamic load can be reduced.

It is also conceivable to provide more than one diagonal stiffener 213 on the pivoting leg 2 , with the diagonal stiffeners 213 being able to be arranged on opposite sides of the pivoting leg 2 or on the same side of the pivoting leg 2 .

figure 2 shows a truck-mounted concrete pump 1 known from the prior art, in which there is no diagonal reinforcement 213 between the legs 211, 212 and as a result the pivoting leg 2 must be made more massive, heavier and therefore more expensive in order to be able to withstand the same loads as in figure 1 shown vehicle according to the invention.

Claims (9)

1. Truck-mounted concrete pump (1) comprising at least one rear pivotable leg (2) and at least one front pivotable leg (3), wherein the front pivotable leg (3) comprises a leg box (26) and at least one inner part (22) that is telescopic with respect thereto, and wherein the rear pivotable leg (2) comprises an outer part (21) having a upper (211) and a lower (212) limb, between which the inner part (22) of the front pivotable leg (3) can be mounted in a state telescoped and pivoted in, characterised in that the two limbs (211, 212) are coupled together by means of at least one diagonal bracing (213), wherein the lower limb (212) of the rear pivotable leg (2) is connected diagonally, on the outside thereof, by a lower articulation point of the rear pivotable leg (2), to the leg-side end of the upper limb (212), and/or in the reverse direction.
2. Truck-mounted concrete pump (1) according to claim 1, characterised in that the two limbs (211, 212) are coupled in the height direction, at least in portions or over the entire length thereof, only by the diagonal bracing (213).
3. Truck-mounted concrete pump (1) according to either of the preceding claims, characterised in that the diagonal bracing (213) extends as far as an innermost portion of one of the limbs (211, 212).
4. Truck-mounted concrete pump (1) according to any of the preceding claims, characterised in that the diagonal bracing (213) extends as far as a swivel pin (23) of the rear pivotable leg (2).
5. Truck-mounted concrete pump (1) according to any of the preceding claims, characterised in that a U-shaped, biangular, triangular or polygonal opening (24) is formed between the limbs (211, 212), which opening is in particular open towards the outside.
6. Truck-mounted concrete pump (1) according to any of the preceding claims, characterised in that the inner part (22) of the front pivotable leg (3) is surrounded, in the telescoped-in state thereof, by the limbs (211, 212) and the diagonal bracing (213) of the rear pivotable leg (2).
7. Truck-mounted concrete pump (1) according to any of the preceding claims, characterised in that the diagonal bracing (213) is at least as long as the spacing of the two limbs (211, 212) and/or at most twice as long as one of the limbs (211, 212).
8. Truck-mounted concrete pump (1) according to any of the preceding claims, characterised in that the diagonal bracing (213) has a uniform profile, at least in part, in the longitudinal direction thereof, and/or is larger in length than in width.
9. Truck-mounted concrete pump (1) according to any of the preceding claims, characterised in that at least two diagonal bracings (213) are provided on the rear pivotable leg (2).

Images