EP0838562B1 - Concrete pump boom - Google Patents

Description

The invention relates to a concrete placing boom for stationary and mobile concrete pumps with several Articulated joints, with articulated axes parallel to each other interconnected elongated mast arms and with one of several articulated, led along and attached to the mast arms Existing pipe segments, at the end of the last Mast arms in a concrete delivery line ending in an end hose.

It is known, concrete booms designed as articulated masts fold so that the end hose supporting last mast arm in its rest position at least one of the other mast arms in this parallel alignment comes to lie. With such Concrete placing booms must be constructed and constructed be ensured by a defined folding strategy, that when unfolding and when folding it is not too Collisions between the mast arms is coming. This problem Occurs mainly with overhead scroll moths with some cranked mast arms. In addition, the large-scale concreting, in which the end hose by stretching and / or shortening the articulated mast and by swiveling the end hose transversely to the stretch and Shortening direction over the surface to be concreted is moved, either the end hose by hand bent or the entire concrete placing boom around his Vertical axis is pivoted on the pedestal. In the former Trap can only be relatively small swivel angles achieve while in the latter case the total mass the placing boom must be moved back and forth.

Proceeding from this, the invention is based on the object a concrete placing boom of the type specified at the beginning Kind of develop that is easier to use guaranteed during unfolding and folding and / or when concreting.

To solve this problem is the in claim 1 specified combination of features proposed. advantageous Refinements and applications of the invention result themselves from the dependent claims.

The solution of the invention is above all the idea based on the fact that a further degree of freedom of movement in Area of the last mast arm carrying the end hose in many applications with significant advantages brings itself. To achieve this, according to the invention suggested that the last mast arm in two on one to the last articulation axis and to the longitudinal extent of the last mast arm vertical pivot axis limited arm sections pivotable against each other is. If the concrete delivery line is not as it has sufficient flexibility it is important that the one guided along the last mast arm Pipe segment two pivotable against each other about the pivot axis or has bendable segment sections. To this end, can stare between the two Pipe segment sections either one with the swivel axis aligned swivel coupling or a flexible one Connection hose can be arranged.

Are in the interest of an automatic movement the two arm sections with hydraulic or electrical Means pivotable against each other.

For most applications, it is advantageous if the arm section on the end hose side is at least five times longer than the articulated side Arm section is.

In order to minimize the forces acting on the placing boom, it’s an advantage if the arm sections between two limit switches or end stops damped by the end position are limited pivotable against each other. The Swivel angle should be limited to 3 ° to 10 °.

With the measures according to the invention, the large area Concreting is facilitated by the fact that the end hose supporting arm section of the last mast arm the one located between the two arm sections Swivel axis between two during the concreting process End positions is automatically swung back and forth. The pivoting movement is expediently controlled remotely triggered. It is also advantageous if the end positions, i.e. the swivel angle around the swivel axis adaptable to the conditions given by the construction site is.

Furthermore, the measures according to the invention enable simplified procedure for unfolding and folding a concrete placing boom where the last boom arm at least when folding in its rest position one of the other mast arms comes to rest and the mast arm above it may be cranked is. If the concrete placing boom is added as an overhead roller folder is a collision-free Unfolding is often difficult. Around Avoiding difficulties is according to the invention suggested that the end hose side arm section of the last mast arm around his to the neighboring one Articulation axis and perpendicular to the longitudinal extension of the mast arm Pivot axis at the beginning of the unfolding process its rest position swung out sideways and at the end of the Folding process is pivoted back into this rest position.

Fig. 1

eine Seitenansicht eines Betonfahrmischers mit Betonpumpe und Verteilermast;

Fig. 2

eine Draufsicht auf die Mastarme 1 und 3 des Betonverteilermasts bei seitlich ausgeschwenktem Mastarm 3;

Fig. 3

eine schaubildliche Darstellung des Fahrmischers nach Fig. 1 mit ausgefaltetem Betonverteilermast beim Betonieren großer Flächen;

Fig. 4a und b

je einen Ausschnitt aus dem letzten Mastarm aus dem Bereich der Schwenkachse mit zwei verschiedenen Förderleitungs-Gelenken.

The invention is explained in more detail below with reference to the drawing. Show it

Fig. 1

a side view of a concrete mixer truck with concrete pump and placing boom;

Fig. 2

a plan view of the mast arms 1 and 3 of the concrete placing boom with the mast arm 3 pivoted out laterally;

Fig. 3

a schematic representation of the truck mixer of Figure 1 with folded concrete placing boom when concreting large areas.

4a and b

A section from the last mast arm from the area of the swivel axis with two different delivery line joints.

The truck mixer pump shown in Fig. 1 consists in essentially from a four-axle chassis 10, one in the middle of the chassis 10 around Axis 12 rotatably arranged, with its loading and Extend outlet opening 14 diagonally to the rear Mixing drum 16, one in the area of the rear axles 18, 18 'arranged on the chassis 10 two-cylinder thick matter pump 20 with material feed container 22 and one in the area of the front axles 24, 24 'near the driver's cab 26 on a bearing block 28 around a vertical Axis 30 rotatably mounted, from three at the articulated joints A, B and C mast arms can be swiveled towards each other 1, 2, 3 composite concrete boom 32 as Carrier for a concrete delivery line 34. The concrete delivery line 34 is composed of several tube segments 34 ', 34' ', 34 '' 'assembled at the hinge ends the mast arms 1, 2, 3 via pipe bends 36 and pipe slewing rings 38 are hinged together and on End of the last mast arm 3 into an end hose 62 lead.

The first mast arm 1 has two on a crank 40 interconnected arm sections 42, 44. The Crank 40 is positioned and dimensioned such that the mast arm 1 in the folded state of the distribution mast surrounds the mixing drum 16 on the outside (FIG. 2).

The last mast arm 3 is in two arm sections 3 ', 3' ' subdivided by one to the neighboring articulation axis C and 3 vertical to the longitudinal extension of this mast arm Pivot axis 46 'can be pivoted relative to one another by approximately 5 ° are. The swiveling takes place either via a hydraulic cylinder 48 (Fig. 2) or via a hydraulic Swing motor 50 (Fig. 4a and b). Next is on Mast arm 3 along pipe segment 34 '' 'in two the pivot axis 46 'or mutually bendable pivotable segment sections 52 ', 52' 'divided, which in the case of Fig. 4a by a flexible conveyor hose 54 and in the case of Fig. 4b by two 90 ° pipe bends 56 and one arranged between the pipe bends, rotary coupling 58 concentric with pivot axis 46 ' are interconnected.

In the application example shown in Fig. 2, this is Swivel joint 46 used in the last mast arm 3, the Arm section 3 '' from the collision area with the cranked Swing mast arm 1 out before the placing boom unfolded from its rest position shown in Fig. 1 becomes.

3, the arm section 3 '' for large-area concreting in the direction of the double arrow 60 about the pivot axis 46 ' the arm section 3 'and thus also compared to the rest Mast arms 1 and 2 swung back and forth. The outlet of the end hose 62 sweeps depending on Extended position of the placing boom shown in Fig. 3 Arch sections 64 on the surface to be concreted 66th

In summary, the following can be stated: The invention refers to a concrete placing boom for stationary and mobile concrete pumps. He instructs several Articulated joints with mutually parallel articulation axes A, B, C connected elongated mast arms 1, 2, 3 and one of several articulated, along the mast arms 1, 2, 3 guided pipe segments 34 ', 34' ', 34' '' existing, at the end of the last Mast arms 3 in an end hose 62 concrete delivery line 34 on. To facilitate handling the placing boom unfolds from its rest position and when concreting large areas is according to the invention suggested that the last mast arm 3 in two at one to the last articulation axis C and to the longitudinal extent of the last mast arm 3 vertical swivel axis 46 'limits arm sections which can be pivoted relative to one another 3 ', 3 "is divided.

Claims (13)

1. A concrete distributor mast for stationary and mobile concrete pumps having a plurality of elongated mast arms (1, 2, 3) which are interconnected at articulated joints with mutually parallel axes (A, B, C), and having a concrete delivery pipe line (34) which consists of a plurality of pipe line segments (34', 34", 34"') which are connected to each other in an articulated manner and which are guided along and connected to the mast arms (1, 2, 3), the pile line ending in an end hose (62) at the end of the last mast arm (3), characterized in that the last mast arm (3) is divided into two arm sections (3', 3") which are limitedly pivotable to each other about a pivot axis (46') which is perpendicular to the last articulation axis (C) and to the longitudinal extension of the last mast arm (3).
2. The concrete distributor mast of claim 1, characterized in that the pipe line segment (34"') guided along the last mast arm (3) comprises two segment sections (52', 52") which are pivotable or bendable with respect to each other about the pivot axis (46').
3. The concrete distributor mast of claim 1 or 2, characterized in that the two arm sections (3', 3") are pivotable with respect to each other by hydraulic or electric means (48, 50).
4. The concrete distributor mast of one of claims 1 to 3, characterized in that the arm section (3") adjacent to the end hose is longer than the arm section (3') adjacent to the articulated joint.
5. The concrete distributor mast of claim 4, characterized in that the arm section (3") adjacent to the end hose is at least five times as long as the arm section (3') adjacent to the articulated joint.
6. The concrete distribution mast of one of claims 1 to 5, characterized in that the arm sections (3', 3") are limitedly pivotable with respect to each other between two limit switches or stops which are dampened in their end positions.
7. The concrete distributor mast of one of claims 1 to 6, characterized in that the pivot angle between the two arm sections (3', 3") is limited to 3° to 10°.
8. The concrete distributor mast of one of claims 1 to 7, characterized in that a rotational clutch (58) which is aligned with the pivot axis (46') is positioned between the two rigid pipe segment sections (52', 52").
9. The concrete distributor mast of one of claims 1 to 7, characterized in that a flexible connecting hose (54) is positioned between the two rigid pipe segment sections (52', 52").
10. A method for distributing concrete including the use of the concrete distributor mast of one of claims 1 to 9, which mast is connected to a stationary or mobile concrete pump, the method including moving the end hose (62) over the area to be supplied with concrete by extending and/or retracting the concrete distributor mast by way of its articulated joints and by pivoting the end hose (62) perpendicularly to the direction of extension and retraction, characterized in that an arm section (3") of the last mast arm (3), which section carries the end hose (62), is automatically pivoted during the concrete distribution between two end positions about a pivot axis (46') which is positioned between the last articulated joint and the end hose (62) and which is oriented perpendicularly to the adjacent articulation axis (C) and the longitudinal extension of the mast arm (3).
11. The method of claim 10, characterized in that the pivoting movement is adapted to be executed by remote control.
12. The method of claim 10 or 11, characterized in that the pivot angle between the arm sections (3', 3") is adjustable according to need.
13. A method for folding and unfolding the concrete distributor mast of one of claims 1 to 9, the mast preferably being of the overhead roll folding type, in which the last mast arm (3) is folded during the folding operation in its rest position beneath at least one of the other mast arms in a preferably parallel alignment, characterized in that an arm section (3") of the last mast arm (3) which carries the end hose (62) is laterally pivoted from its rest position at the beginning of the unfolding operation and pivoted back into its rest position at the end of the folding operation about a pivot axis (46') which is positioned on this last mast arm (3) and which is perpendicular with respect to the adjacent articulation axis (C) and to the longitudinal extension of this mast arm (3).

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