Concrete conveyor vehicle
Patent Information
- Application Number
- PCT/EP2026/057503
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-03-24
- Filing Date
- 2026-03-17
- Publication Date
- 2026-10-01
Smart Images
Figure EP2026057503_01102026_PF_FP_ABST
Abstract
Description
[0001] PUTEI 11PW0
[0002] 17.03.2026 / PH
[0003] concrete conveyor vehicle
[0004]
[0001] Concrete conveying vehicles are used to convey liquid concrete or similar materials, such as bulk materials or viscous substances, along a mast arm of the concrete conveying vehicle, so that the liquid concrete can be discharged at a desired location via a distal end of the mast arm. The mast arm is typically composed of a plurality of mast segments, wherein in an extended state the mast arm extends over a large distance and wherein in a retracted state the mast segments are in a compact state, so that the mast arm lies within the dimensions of the concrete conveying vehicle.
[0005]
[0002] By mounting the mast arm on a vehicle, high mobility is achieved, allowing the machine to be easily used in different locations. Before use, support legs are extended outwards to securely stabilize the concrete conveyor vehicle. This stabilization ensures that the concrete conveyor vehicle remains stable even when the mast arm is extended far to the side.
[0006]
[0003] It is common practice to design the support legs of a concrete pumping vehicle, at least in sections, as hollow profiles. It is desirable to make good use of the considerable volume inside such a hollow profile. For this purpose, it is advantageous to have an opening in one side wall of the support leg. On the other hand, an opening weakens the structure of the support leg. If such a weakening is compensated for by a greater material thickness of the side wall, this has the disadvantage of increasing the weight of the support leg. It has proven not entirely straightforward to give a support leg with a side opening sufficient strength and service life through local reinforcements.
[0007]
[0004] The invention is based on the objective of providing a concrete conveying vehicle with which the aforementioned disadvantages are reduced. This objective is achieved by the features of the independent claim. Advantageous embodiments are specified in the dependent claims.
[0008]
[0005] A concrete conveying vehicle according to the invention comprises a frame and an extendable mast arm, wherein the frame supports the mast arm. The concrete conveying vehicle is designed to convey liquid concrete along the mast arm, so that the liquid concrete is dispensed at a distal end of the mast arm. The concrete conveying vehicle is equipped with a support leg, wherein the support leg is movable between a retracted state and an extended state. The support leg has a section designed as a hollow profile. The hollow profile is bounded by a web plate, wherein a first opening is formed in the web plate. The support leg comprises a reinforcing plate, wherein a second opening is formed in the reinforcing plate. The first opening and the second opening together form a window cutout in a side wall of the support leg.The web plate and the reinforcement plate are connected to each other by a weld seam enclosing the perimeter of the window opening.
[0009]
[0006] The invention proposes reinforcing a web plate, which laterally defines the support leg, with a reinforcing plate resting on the web plate. The reinforcing plate also has an opening, so that the opening of the web plate and the opening of the reinforcing plate together form the window opening. The invention recognizes that such a local reinforcing plate can contribute sufficiently to the strength and service life of the support leg if it is welded to the web plate by a weld seam enclosing the circumference of the window opening. The material thickness of the reinforcing plate can be greater than the material thickness of the web plate.
[0010]
[0007] The weld seam preferably extends without interruption around the circumference of the window opening. It has been shown that an end section of a weld seam is associated with local stress peaks that are detrimental to the strength and service life of the support leg. By extending the weld seam without interruption around the circumference, there are no such end sections, but rather the weld seam forms a continuous, uninterrupted path.
[0011]
[0008] The opening of the web plate (first opening) can be geometrically similar to the opening of the reinforcing plate (second opening). In particular, the shape of the two openings can be such that they can be transformed into one another by geometric scaling, i.e., by enlarging or reducing them to scale.
[0012]
[0009] The size of the first opening can differ from the size of the second opening. The two openings can be arranged relative to each other such that a gap exists around the opening of the web plate between the edge of the first opening and the edge of the second opening. The window cutout is then defined by the smaller of the two openings. The weld seam can extend along the opening edge of the larger of the two openings.
[0013]
[0010] The two openings can be designed such that the area of the larger opening differs from the area of the smaller opening by no more than 50%, preferably by no more than 20%, and furthermore by no more than 10%. The reference size for comparison is the area of the smaller opening. In one embodiment, the opening of the reinforcing plate is larger than the opening of the web plate. The weld seam can then extend over the opening edge of the reinforcing plate and be spaced apart from the opening edge of the web plate. It is also possible that the opening of the web plate is larger than the opening of the reinforcing plate. The weld seam can then extend over the opening edge of the web plate and be spaced apart from the opening edge of the reinforcing plate.
[0014]
[0011] The strip enclosed between the two opening edges can extend uninterrupted around the circumference of the openings. The strip can have a substantially constant width. In particular, the support leg can be designed such that the greatest width of the strip differs from the smallest width of the strip by no more than 50%, preferably by no more than 20%, and more preferably by no more than 10%. The smallest width serves as the reference for comparison. In one embodiment, the strip enclosed between the openings has a constant width around its entire circumference.
[0015]
[0012] If the strip does not have a constant width, it is advantageous if the distance between the edge of the smaller opening and the edge of the larger opening is greater in a corner region of the window opening than in a region of the window opening spaced apart from the corner region. In one embodiment, this applies to each of the corner regions, in particular to each of the four corner regions of the window opening. Between each pair of adjacent corner regions, there can be a region of the window opening in which the distance between the edge of the smaller opening and the edge of the larger opening is smaller than in the two corner regions. This has the advantage that in areas of particularly high stress there is an increased distance between the circumferential weld seam and the edge of the window opening. In this embodiment, the smaller opening can be formed in the reinforcing plate and the larger opening in the web plate.
[0016]
[0013] The direction from the proximal end to the distal end of the support leg corresponds to the longitudinal direction. The support leg can be attached to the frame of the concrete conveyor vehicle at its proximal end. A pivot joint can be formed between the proximal end of the support leg and the frame. The pivot axis of the pivot joint can be vertically oriented. The height and side dimensions of the support leg each form a right angle with the longitudinal direction. The web plate can be oriented such that the window opening extends in the longitudinal direction and in the height dimension of the web plate. The height of the window opening can be dimensioned such that the window opening extends over at least 40%, preferably at least 60%, and more preferably at least 80% of the height of the cavity located behind the window opening.
[0017]
[0014] For the force flow, it is advantageous if the contour of the window opening is as rounded as possible. The smallest radius of any curvature occurring in the contour of the window opening is preferably not less than 10%, preferably not less than 20%, and furthermore not less than 50% of the height of the window opening. If the height of the window opening is not constant, the specification refers to the greatest height of the window opening.
[0018]
[0015] The cavity can be enclosed longitudinally between two baffle plates, the first baffle plate being arranged between the cavity and the proximal end of the support leg, and the second baffle plate being arranged between the cavity and the distal end of the support leg. The length of the window opening can be dimensioned such that the window extends over at least 50%, preferably at least 70%, and more preferably at least 90% of the length of the cavity.
[0019]
[0016] Between the first bulkhead and the proximal end of the support leg and / or between the second bulkhead and the distal end of the support leg, one or more further cavities can be formed within the support leg. One or more of the cavities can be designed as a liquid tank, in particular as a fuel tank.
[0020]
[0017] In addition to the weld seam extending around the circumference of the window opening, the reinforcing plate can also be welded to the support leg structure at its outer circumference. The support leg can be designed such that the weld seam at the outer circumference of the reinforcing plate forms a further connection between the reinforcing plate and the web plate. If the cavity is bounded by bulkhead plates, the outer circumference of the reinforcing plate can be welded to a bulkhead plate at its rear end and / or at its front end. If the cavity is bounded upwards by a flange plate, the outer circumference of the reinforcing plate can be welded to the flange plate at its upper end. If the cavity is bounded downwards by a flange plate, the outer circumference of the reinforcing plate can be welded to the flange plate at its lower end.
[0021]
[0018] The reinforcing plate can be arranged on the inside of the web plate. The reinforcing plate is then located between the cavity and the web plate. It is also possible for the reinforcing plate to be arranged on the outside of the web plate. In this case, the web plate is located between the cavity and the reinforcing plate.
[0019] The web plate can form an outer web of the support leg. The outer web faces the outside of the vehicle when the support leg is in the retracted position. It is also possible for the web plate to form an inner web of the support leg. The inner web faces the center of the vehicle when the support leg is in the retracted position.
[0022]
[0020] The window opening can be arranged in a proximal section of the support leg. In particular, the distance between the distal end of the window opening and the distal end of the support leg can be at least twice as large, preferably at least five times as large, as the distance between the proximal end of the window opening and the proximal end of the support leg.
[0023]
[0021] The cavity formed behind the window opening can be bounded upwards by a first flange plate. The first flange plate can extend without interruption from the cavity to a joint receptacle formed at the proximal end of the support leg. The first flange plate can form the upper flange of the support leg, by which the support leg is bounded upwards. The first flange plate can also form an upper intermediate flange, which is arranged between an upper flange and the cavity. In this case, both the upper intermediate flange and the upper flange can extend without interruption from the cavity to the joint receptacle at the proximal end of the support leg.
[0024]
[0022] The cavity formed behind the window opening can be bounded downwards by a second flange plate. The second flange plate can extend without interruption from the cavity to the proximal joint receptacle. The second flange plate can form the lower flange of the support leg, by which the support leg is bounded downwards. The second flange plate can also form a lower intermediate flange, which is arranged between a lower flange and the cavity. In this case, both the lower intermediate flange and the lower flange can extend without interruption from the cavity to the joint receptacle at the proximal end of the support leg.
[0025]
[0023] In one embodiment, the support leg is equipped with a first window opening in the outer web and a second window opening in the inner web. The first window opening and the second window opening can be aligned with each other, which means that there is an axis pointing transversely to the support leg that intersects both the first window opening and the second window opening. The overlap can extend over at least 40%, preferably at least 60%, and more preferably at least 80% of the area of the window openings. If the window openings are not of the same size, the comparison refers to the smaller of the two window openings.
[0026]
[0024] All features described in connection with a first reinforcing plate and a first web plate can also be implemented individually or in combination in the second reinforcing plate and the second web plate.
[0027]
[0025] A component of the concrete pumping vehicle can be arranged in the cavity located behind the window opening. This component can be fixedly attached to the concrete pumping vehicle. The component can be attached to the support leg so that it moves with the support leg when the support leg pivots. Alternatively, the component can be attached to the frame of the concrete pumping vehicle so that it maintains a fixed position relative to the frame when the support leg is retracted or extended. When the support leg is retracted, the component can protrude into the cavity through a window opening in the inner web plate. The component can, for example, be an oil cooler, in particular an oil cooler for the hydraulic system of the concrete pumping vehicle.
[0028]
[0026] The concrete conveying vehicle can include more than one support leg. These can include a front support leg and a rear support leg. The window opening can be located in the rear support leg. The terms "front" and "rear" refer to the direction of travel of the concrete conveying vehicle when moving forward. The concrete conveying vehicle can include a front support leg and a rear support leg on both sides.
[0029]
[0027] The support leg can be a pivoting leg. A pivoting leg is connected to a frame of the concrete pumping vehicle via a pivot joint and can be moved between a retracted and an extended state by a pivoting motion. The pivoting leg can additionally or alternatively be a telescopic leg. A telescopic leg can be linearly adjusted in length by moving leg segments relative to each other. In the retracted state, the support leg lies within the contour of the concrete pumping vehicle, so that the concrete pumping vehicle can be moved in road traffic. In the extended state, the support leg projects far outwards, so that the concrete pumping vehicle stands stably.
[0030]
[0028] The concrete conveying vehicle can be designed as a concrete pump vehicle. The concrete pump vehicle comprises a concrete pump designed to convey liquid concrete along a conveying line extending to a distal end of the mast arm. The mast arm can be composed of a plurality of mast arm segments, wherein in an extended state the mast arm extends over a large distance and wherein in a folded state the mast arm segments are in a compact state, such that the mast arm lies within the dimensions of the concrete pump vehicle.
[0031]
[0029] In an alternative embodiment, the concrete conveying vehicle is designed as a belt conveying vehicle. The belt conveying vehicle can comprise a mast arm, with a first belt conveyor extending to a distal end of the mast arm. The mast arm can comprise a plurality of mast arm segments, each segment carrying a section of the belt conveyor. The mast arm can be telescopically extendable between a fully extended state, in which the mast arm extends over a considerable distance, and a retracted state, in which the mast arm is within the dimensions of the belt conveying vehicle. The belt conveying vehicle can comprise a second belt conveyor extending between a pre-filling hopper and a proximal end of the first belt conveyor.
[0032]
[0030] The invention is described below by way of example with reference to the accompanying drawings, using advantageous embodiments as an example. The drawings show:
[0033] Fig. 1 : a concrete pump vehicle with a mast arm in the folded state;
[0034] Fig. 2 : the concrete pump vehicle from Fig. 1 with the mast arm extended;
[0035] Fig. 3 : a schematic top view of an invention according to the concrete pump vehicle;
[0036] Fig. 4: the view according to Fig. 3 in a different state of the concrete pump vehicle;
[0037] Fig. 5: the proximal end of a support leg of the concrete pump vehicle from Fig. 3, 4; Fig. 6: a section along line AA from Fig. 5;
[0038] Figs. 7, 8: the view according to Figs. 5, 6 in another embodiment of the invention;
[0039] Figs. 9, 10: the view according to Figs. 5, 6 in a further embodiment of the invention;
[0040] Figs. 11, 12: the view according to Figs. 5, 6 in yet another embodiment of the invention;
[0041] Fig. 13 : a schematic representation of a belt conveyor vehicle according to the invention;
[0042] Fig. 14: the conveyor vehicle according to Fig. 13 in a top view.
[0043]
[0031] A concrete conveying vehicle in the form of a concrete pump truck 14, shown in Fig. 1, is equipped with a concrete pump 15 that conveys liquid concrete from a pre-filling hopper 16 through a conveying line 17. The conveying line 17 extends along a mast arm 18, which is rotatably mounted on a slewing ring 19. The mast arm 18 comprises three mast arm segments 20, 21, 22, which are articulated together. By pivoting the mast arm segments 20, 21, 22 relative to each other via the joints, the mast arm 18 can be moved between a folded state (Fig. 1) and an extended state (Fig. 2). The conveying line 17 extends beyond the distal end of the third mast arm segment 22, so that the liquid concrete can be applied in an area remote from the concrete pump 15.
[0044]
[0032] To ensure that the concrete pump vehicle remains stable even when the mast arm 18 is extended, support legs 31, 32, 33, 34 are provided, which are attached to the frame 26 of the concrete pump vehicle 14 via pivot joints 39. The support legs 31, 32, 33, 34 can be moved between a retracted state (Fig. 3) and an extended state (Fig. 4). An end of the support leg 31, 32, 33, 34 adjacent to the respective pivot joint 39 is referred to as the proximal end 28.
[0045]
[0033] The front support legs 31, 33 each carry a support cylinder 35 at their distal end 29 located at the front, and the rear support legs 32, 34 each carry a support cylinder 35 at their distal end 29 located at the rear. The support cylinder 35 can be extended vertically downwards until a foot attached to it touches the ground. By extending the support cylinder 35 further, the concrete pump vehicle 14 can be raised so that it rests only on the feet of the support cylinders 35. The rear support legs 32, 34 can be rigid support legs of a fixed length. The front support legs 31, 33 can be telescopic support legs.
[0046]
[0034] Fig. 5 shows a side view of the proximal end 28 of the left rear support leg 32. The support leg 32 is in the retracted position. The pivot joint 39 is formed by a joint receptacle 40 attached to the frame 26 and a pivot pin 41 extending vertically through the support leg 32.
[0047]
[0035] The support leg 32 forms a hollow profile, which, according to the sectional view in Fig. 6, is composed of an upper chord 42, a lower chord 43, an inner web plate 44, and an outer web plate 45. A window opening 46 is formed in both the inner web plate 44 and the outer web plate 45. The two window openings 46 are aligned with each other, so that an oil cooler 47, which is attached to the frame 26 of the concrete pump vehicle, is visible through the two window openings 46. The oil cooler 47 projects into the cavity 56 inside the support leg 32 when the support leg 32 is in the retracted position.
[0048]
[0036] The cavity 56 is bounded longitudinally by a proximal bulkhead 48 and a distal bulkhead 49. Each of the bulkheads 48, 49 forms a closed surface over the cross-section of the support leg 32. A first reinforcing plate 50 is attached to the inside of the outer web plate 45, in which an opening 55 is formed that is slightly larger than the opening 54 in the outer web plate 45 that forms the window opening 46. The opening 55 (second opening) in the reinforcing plate 50 is slightly larger than the opening 54 (first opening) in the outer web plate 45 that corresponds to the window opening 46. Both openings 54, 55 have the same geometric shape, so that a strip of constant width is enclosed between the two openings 54, 55.
[0049]
[0037] A first weld 51 is formed along the opening 55 of the reinforcing plate 50, extending without interruption over the entire circumference of the opening 55. The reinforcing plate 50 is welded to the inside of the outer web plate 45 by the first weld 51. The first weld 51 is positioned so that it maintains a distance from the edge of the opening 54 of the outer web plate 45.
[0050]
[0038] A second weld 57 extends around the outer circumference of the reinforcing plate 50. The second weld 57 has a first section connected to the upper chord 42, a second section connected to the distal bulkhead plate 49, a third section connected to the lower chord 43, and a fourth section connected to the proximal bulkhead plate 48. The second weld 57 extends continuously around the outer circumference of the reinforcing plate 50.
[0039] The inner web plate 44 is reinforced accordingly with a second reinforcing plate 50. The two reinforcing plates 50 strengthen the support leg 32 in the area where it is weakened by the two window cutouts 46. The two web plates 44, 45 can thus be dimensioned as if the support leg 32 had no window cutouts 46.In particular, the two web plates 44, 45 can extend with constant thickness over the entire length of the support leg 32 from the proximal end 28 to the distal end 29. The weakening resulting from the window opening 46 is compensated for by the two reinforcing plates 50. The circumferential weld 51, which maintains a distance from the window opening 46, prevents stress concentrations in the area of the window opening 46.
[0051]
[0040] Figures 7 and 8 show an alternative embodiment in which a window opening 46 is formed only in the outer web plate 45. The inner web plate 44 forms a continuous boundary for the cavity 56, in which there is no window opening. The closed wall of the inner web plate 44 is visible through the window opening 46 of the outer web plate 45.
[0052]
[0041] A reinforcing plate 50 is attached to the outside of the outer web plate 45. A second opening 55 is formed in the reinforcing plate 50, which is smaller than the first opening 54 in the outer web plate 45. The window opening 46 is bounded by the edge of the second opening 55 of the reinforcing plate 50. A first weld 51 connects the inside of the reinforcing plate 50 to the edge of the first opening 54. The first weld 51 maintains a distance from the edge of the second opening 55. A second weld 57 extends over the outer circumference of the reinforcing plate 50 and establishes a connection to the outside of the outer web plate 45.
[0042] In Figs. 9 and 10, a further embodiment is shown in which an upper intermediate chord 52 is arranged between the upper chord 42 and the cavity 56, and in which a lower intermediate chord 53 is arranged between the lower chord 43 and the cavity 46.The continuous weld 57, which extends over the outer circumference of the outer reinforcement plate 50 and the inner reinforcement plate 50, has a first section connected to the upper intermediate flange 52, has a second section connected to the distal bulkhead plate 49, has a third section connected to the lower intermediate flange 53, and has a fourth section connected to the proximal bulkhead plate 48.
[0053]
[0043] The upper chord 42 and the upper intermediate chord 52 extend without interruption from the cavity 46 to an upper section of the pivot joint 39. The upper chord 42 and the upper intermediate chord 52 are enclosed between a two-part joint receptacle 40 of the frame 26. A pivot pin 41 extends through the joint receptacle 40, through the upper chord 42, and through the intermediate chord 52. Similarly, the lower chord 43 and the lower intermediate chord 53 form the lower part of the pivot joint 39.
[0054]
[0044] Figures 11 and 12 show an alternative embodiment in which two reinforcing plates 50 are attached to the inside of the outer web plate 45 and the inside of the inner web plate 44. The second openings 55 of the reinforcing plates 50 are smaller than the first openings 54 in the web plates 44 and 45. The window openings 46 are bounded by the edge of the second openings 55 of the reinforcing plates 50. A first weld 51 connects the outside of the reinforcing plate 50 to the edge of the first opening 54. The first weld 51 maintains a distance from the edge of the second opening 55. The distance is greater in the corner regions of the window opening 46 than in regions of the window opening 46 spaced away from the corner regions, see Figure 11.
[0055] 11. In this way, the first weld 51 maintains a greater distance from the edge of the window opening 46 in areas where particularly high stresses occur, which has a beneficial effect on the strength. A second weld 57 extends over the outer circumference of the reinforcing plates 50 and forms a connection to the flange plates 42, 43.
[0056]
[0045] Figures 13 and 14 show an alternative embodiment of a concrete conveying vehicle in the form of a belt conveyor vehicle 66. The mast arm 67, which is mounted on a slewing ring 19, comprises a plurality of mast arm segments 71 that can be moved telescopically between a retracted and an extended position. A first belt conveyor 73 extends along the mast arm 67 from a proximal end 75 to a distal end 76. An end hose 69 is attached to the distal end 76, through which material conveyed by the first belt conveyor 73 is discharged. The material can be, for example, liquid concrete, another viscous material, or a bulk material. The belt conveyor vehicle 66 comprises a second belt conveyor 68, via which material that has been filled into the pre-filling hopper 60 is fed to the proximal end 75 of the first belt conveyor 73.The two rear support legs 32, 34 are equipped with window cutouts 46 according to the invention.
Claims
Patent claims 1. Concrete conveying vehicle comprising a frame (26) and an extendable mast arm (18, 67), wherein the frame (26) supports the mast arm (18, 67), wherein the concrete conveying vehicle is designed to convey liquid concrete along the mast arm (18, 67) such that the liquid concrete is dispensed at a distal end (27) of the mast arm (18, 67), wherein the concrete conveying vehicle (14, 66) is equipped with a support leg (31, 32, 33, 34), wherein the support leg (31, 32, 33, 34) is movable between a retracted state and an extended state, wherein the support leg (31, 32, 33, 34) has a section designed as a hollow profile, the hollow profile being bounded by a web plate (44, 45) is, wherein a first opening (54) is formed in the web plate (44, 45), wherein the support leg (31, 32, 33, 34) comprises a reinforcing plate (50), wherein a second opening (55) is formed in the reinforcing plate (50),wherein the first opening (54) and the second opening (55) together form a window cutout (46) in a side wall of the support leg (31, 32, 33, 34) and wherein the web plate (44, 45) and the reinforcing plate (50) are connected to each other by a weld seam (51) enclosing the circumference of the window cutout (46).
2. Concrete conveying vehicle according to claim 1, wherein the size of the first opening (54) differs from the size of the second opening (55).
3. Concrete conveying vehicle according to claim 3, wherein the area of the larger opening (54) differs from the area of the smaller opening (55) by no more than 50%.
4. Concrete conveying vehicle according to claim 2 or 3, wherein the weld seam (51) has a distance from the edge of the smaller opening (54).
5. Concrete conveying vehicle according to one of claims 1 to 4, wherein the window cutout (46) has a rounded contour.
6. Concrete conveying vehicle according to one of claims 1 to 5, wherein a cavity (56) located behind the window cutout (46) is enclosed between a proximal bulkhead plate (48) and a distal bulkhead plate (49).
7. Concrete conveying vehicle according to one of claims 1 to 6, wherein the reinforcing plate (50) is connected to the structure of the support leg (31, 32, 33, 34) via the first weld (51) and via a second weld (57), and wherein the second weld (57) extends without interruption over the outer circumference of the reinforcing plate (50).
8. Concrete conveying vehicle according to one of claims 1 to 7, wherein the reinforcing plate (50) is arranged on the inside of the web plate (44, 45).
9. Concrete conveying vehicle according to one of claims 1 to 8, wherein the support leg (31, 32, 33, 34) comprises the first web plate (45) and a second web plate (44), wherein the first web plate (45) forms an outer web and the second web plate (44) forms an inner web of the support leg (31, 32, 33, 34), wherein a first window opening (46) is formed in the first web plate (45) and a second window opening is formed in the second web plate (44).
10. Concrete conveying vehicle according to claim 9, wherein the second window opening is reinforced with a second reinforcing plate. 19 11. Concrete conveying vehicle according to one of claims 1 to 10, wherein an oil cooler (47) is connected to the frame (26) of the concrete conveying vehicle, wherein the oil cooler (47) projects through the window opening (46) into the support leg (31, 32, 33, 34) when the support leg (31, 32, 33, 34) is in the retracted state.