DE2724810A1 - Mobile hydraulically positioned concrete distributor mast support - has hinged struts on mast block leading to auxiliary frame rear end - Google Patents

Abstract

The concrete distributor is of the mast type, comprising a multi-membered hydraulically bent and rotated distributor arm supported on the ground by a mast block and legs, with carrier vehicle and pump firmly connected to it. The mast block pref. has forward swinging or folding support legs, and is fastened to the distributor's auxiliary frame (7) with bolt hinges (6) set at max. depth. The upper part of the block (3) has struts (17) hinged pref. close to the pivot bearing (8). These lead to the rear outside end of the auxiliary frame or of its cross beam (15), pref. to the point where the rear support legs (17) introduce their support forces.

Description

Concrete distributor

The invention relates to mobile concrete placing booms.

They are usually built on self-propelled Ueton pumps. the The mass delivered by the pump is conveyed through a delivery line which is attached to the distributor arm entian <j {3cfuert is directed to the construction site.

A large number of such instructions have become known in practice. Most of these distributor arms are screwed onto a so-called subframe. This also carries the concrete pump. An important problem is the support in the working position. As a rule, hydraulically operated support legs are used here of various types of construction either on the subframe or on the so-called Mast support provided and hydraulically supported on the ground. Vehicle and concrete pump then act as suspended ballast. The support legs are either raised so far that the entire vehicle lifts off the ground with the wheels or that the wheels are on the ground just rest on top.

As the distributor arms got longer, the wheelbases and the vehicles get bigger. In known constructions, folding or pivoting legs are used used, which are hinged to the mast bracket and swivel forward to the front axle, in order to give the greatest possible stability when the distributor arm over the The cab is stretched forward. Then the Distributor arm swiveled backwards to overhang laterally over the rear wheel and are the rear ones If the support legs are attached to the rear end of the subframe, the result is a strong one Twisting of the entire frame and chassis. With a larger support width of the rear support legs will make this appearance worse.

In another construction, both the front and the the rear support legs are mounted on a heavy square sliding frame, which is firmly welded to the mast bracket.

The vertical pivot axes are located at each corner of the subframe the fold-out support legs. Under this auxiliary 5-frame is a second, so-called 5-frame Subframe of the pump and screwed underneath the vehicle frame. ttier became the support forces rear support legs over the pump subframe or chassis frame but directly introduced into the Masbock.

However, such constructions have the disadvantage that they are large Vehicles are extremely difficult to build. Most will be at the rear of the vehicle An additional support leg is necessary to prevent the vehicle from falling tilts backwards when the distributor arm moves backwards over the directly in the direction of travel Concrete pump is stretched out.

Another disadvantage of such designs is the fact that the accessibility to the hydraulic control and drive units is unsatisfactory the concrete pump. They are preferred because of the corresponding drive options Mounted in the center of the vehicle, i.e. exactly where the base of the mast bracket is is screwed to the chassis.

In addition to these disadvantages, there is the great weight of such known ones Constructions, which is particularly disadvantageous in view of the other hand required easy mobility of these units.

The object of this invention is to avoid the disadvantages mentioned and to find a design that, with a large support width and width, the Distributor arm coming support forces on the direct and shortest route into the support legs to the ground.

According to the invention, the placing boom described in claim suggested.

Here the mast bracket 3 and its upper part are designed in a known manner. On the underside, however, it has a heavy cross member 4. You carry the on the outside Joints 11 on which the support legs 12/13 can be pivoted or telescoped or hinged are hinged in a known and proven way.

On the underside of the cross member 4 there are four or more Fastening straps 5, which grip over the two supports 7 of the subframe and there at a low-lying point 6 with the help of bolts and holes in itself are attached in a known manner. The connection at point 6 is preferred executed with a horizontal axis. So it becomes easy assembly, easy processing and allows good adjustability.

On top of the mast bracket 3, preferably near the pivot bearing 8 the struts 17 are articulated. They transmit the load torque of the distributor arm 1 as a tensile or compressive force to the rear end of the mounting frame 7. Preferably the struts 17 at the extreme rear ends of the subframe 7, i.e.

preferably articulated at the outer end of the cross member 15. This Cross member 15 is firmly connected to the longitudinal members of the subframe 7 and is used as a push-out box for laterally telescopic rear support legs 16, which at each have a hydraulic cylinder 13 as a support at their end. Instead of the telescopic Support legs can of course also swivel support legs and similar constructions be provided in a known manner.

Analogously, the supporting forces are directed there via the struts 17, where the support forces from the support leg 13/16 are introduced into the subframe 7, to achieve the most direct and shortest flow of forces.

The struts 17 with pin joints 18/19 are expediently known Attached in a vertical, inclined or horizontal plane.

The construction according to the invention not only gives the advantage of small Construction costs due to the direct and short power flow. It also allows extremely easy assembly, a clear construction, weak, material-saving Dimensioning of the subframe 7. Furthermore, this construction largely avoids any Torsion of the chassis frame. With the appropriate design of the whole will therefore the vehicle is no longer subjected to torsion at all during mast operation.

As can be seen from the figure, it is mostly in vigorous Sheet steel executed platform surface 20 provides good stiffening between the longitudinal members of the subframe 7 and the rear cross member 15 achieved. This prevents If the supporting forces are high, the mounting frame is bent into an S-shape in the horizontal plane will. Preferably, the platform surface 20 is pulled forward to the vicinity of the cross member 4 on the mast bracket 3.

For further stiffening, a cross tube can be used, which is in or near the attachment point 6 between the longitudinal beams 7 axially parallel to the fastening bolts 6 can be installed.

The struts 17 can optionally be viewed from above as shown run obliquely. Your front linkage distance 23 resp.

the rear articulation distance 24 can, however, be changed depending on the other structural requirements on the vehicle and mast.

It is conceivable, for example, that the front articulation distance 24 is approximately the width of the vehicle corresponds, i.e. that the struts 17 are mounted on the top of the mast bracket so that they are far to the outside will. This can be done at the end of the slewing thrust cylinders that are usually present 14. In this way, the accessibility of the platform 20 for loading is fully retained. However must then additionally occurring torsional forces, which by a vertical Axis act, are absorbed by an additional stiffening of the subframe e.g. in a horizontal plane.

Another advantage of the arrangement according to the invention is to be seen in that by changing the length of the struts a slight adjustment to different Vehicle sizes and wheelbases can be made possible without changing the basic structure the subframe and the concrete pump.

The struts 17 can optionally be used as a container for Ilydrauliöl and Something similar can be used so that they serve a dual purpose. This is possible due to their simple static load.

It is also conceivable that the struts 17 can be telescoped hydraulically be carried out to the mast bracket around its pivot point 16, i.

to pivot about a horizontal axis in a vertical plane.

The latter is useful e.g. for applications in tunnels, for painting deep pits or to reduce the height of the mast during transport, by tilting the mast bracket 3 forwards or backwards from the vertical.

Another major advantage of the construction according to the invention is a substantial relief of the front axle. Because the mast bracket 3 is always possible must be arranged close to the front axle in order to achieve a large range on the one hand to reach the front, on the other hand a small rear overhang in the driving position, will in otherwise known constructions, the front axles are slightly overloaded or must be harmful distance between the mast bracket and the front axle. In the case of the drawn The illustration shows those components that are used to transfer the supporting forces in the direction of the rear support leg are not attached near the mast frame and entsI) reched strongly dimensioned. Rather, their weight is largely distributed above or behind the rear axle and thus relieves the front part of the vehicle.

The arrangement according to the invention is equally applicable to stationary used placing booms. In principle, they have the same structure. Instead of A simple profile steel frame with ballast weights is installed under the vehicle frame with the same or similar support w.e drawn in the present example.

Claims (1)

A n p r ü c h e 1. Concrete distributor, consisting of a multi-part, hydraulically articulated and rotatable distributor arm, which extends over a so-called mast bracket and several support legs on dep rso (len supported, the carrier vehicle and the There may be a concrete pump installed as ballast underneath with the distributor are firmly connected, d u r c h cr e k e n -z e i c h n e t that the mast bracket which preferably with the front axle pivoting or folding support legs (12/13) is provided, with pin joints (6) on the auxiliary tap as low as possible ('7) of the distributor is attached and preferably on the upper part of the mast bracket (3) close to the pivot bearing (8) struts (17) are hinged to the rear outer end of the subframe (7) or its cross member (15) lead, preferably to that Place where the rear support legs (16/13) apply their support forces.