Fluid handling – Systems – Multi-way valve unit
Patent
1996-05-16
1998-05-05
Fox, John
Fluid handling
Systems
Multi-way valve unit
137874, F04B 702
Patent
active
057462470
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a slide valve device for a pump with two oppositely working conveying cylinders for the conveyance of thick matter supplied to the pump via a material feed container, with a pivoting pipe which is received in the material feed container and is curved in an essentially C-shaped manner and is connected at its upper end to a rigid conveying conduit via a rotary pipe connection. The pivoting pipe is arranged rotatably by a changeover mechanism about an axis that extends essentially parallel to the axes of the conveying cylinders, in such a way that its other lower end equipped with a wear ring is connected alternately to the orifices of the conveying cylinders connected to the rear wall of the material feed container and can be pressed there, by means of a pressure or tension device, against the edge of the perforations of an interposed wear plate. The changeover mechanism has a changeover lever arranged on the outside of the rear wall of the material feed container above the conveying cylinders, one end of which is rigidly connectable to the upper end of the pivoting pipe and on the other end of which two oppositely actuable drive cylinders, oriented essentially transversely to the conveying cylinders and to the conveying conduit and supported on opposite sides on bearings fixed to the conveying cylinders, are articulated with the mutually confronting ends of their pistons or piston rods.
BACKGROUND OF THE INVENTION
Slide valve devices of this type (DE-C-2,162,406), on account of their compact design, are suitable particularly for concrete pumps mounted on vehicles, in which the conveying pipe adjoining the slide housing makes a connection with the conveying mast resting on the front part of the running gear and in which the material feed container can be charged without difficulty from the rear end face of the running gear. The parts of the slide valve device which are exposed to high wear are easily accessible from the top side of the material feed container and can therefore be exchanged in a simple way. Furthermore, in a slide valve device of this type, it is known that the changeover lever is actuated by means of double-acting cylinders which, during the outward and return stroke, are loaded with pressurized oil alternately on the bottom side and on the rod side. In this case, the hydraulic cylinders are mounted on the cylinder side and on the rod side by a strap, on a bearing block of the running gear or on the changeover lever, clearance for bridging a particular wear path being provided at the bearing points. In this construction, however, it is considered a disadvantage that, on account of the high loads which occur, the points of articulation of the drive cylinders are inclined to a premature deflection, and that the wear path which can be accommodated in the region of the bearing points is relatively small, so that only relatively low wear in the wear ring and in the wear plate is permissible.
SUMMARY OF THE INVENTION
Proceeding from this, the object on which the invention is based is to provide a slide valve device of the initially specified type which can accommodate a large wear path and which can nevertheless absorb by a simple means the bending forces occurring during the changeover operation.
To achieve this object, it is proposed, according to the invention, that the drive cylinders be supported, at their bearing points located on the conveying cylinder side and at those located on the changeover lever side, in ball sockets by ball heads, that the drive cylinders form with one another in their actuating direction an obtuse angle open to the rear wall, and that the changeover lever have a supporting arm which projects on the conveying conduit side and on which an extension pipe connected on the conveying conduit side to the upper end of the pivoting pipe can be supported. By these measures, a relatively large wear path of the slide device can be accommodated, without undesirable sagging or twisting of the changeover lever occurring.
It ha
REFERENCES:
patent: 4502851 (1985-03-01), Calvin et al.
patent: 4653990 (1987-03-01), Schlecht
patent: 4681022 (1987-07-01), Schwing
Hurr Hellmut
Schlecht Karl
Fox John
Putzmeister-Werk Maschinenfabrik GmbH
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