Two-cylinder thick matter pump having a transfer tube

Abstract

A thick matter pump having a material feeding container arranged in which is a pivotable transfer tube. The transfer tube has a pivoting tube that is connected to a delivery line. In order to ensure reliable sealing of the coupling joint between the transfer tube and the container wall, the transfer tube has a metallic ring element which has an inlet in the form of an arcuate slot. A cushion is arranged between the ring element and the pivoting tube. The cushion has an aperture which encloses the slot. The ring element can be moved axially relative to the pivoting tube so that the ring element can be pressed against the inner surface of the container wall via the cushion element under the action of the delivery pressure in the transfer tube.

What is claimed is: 
     
         1 . A thick matter pump, comprising:
 a material feeding container having an interior and a container wall, the container wall having first and second passage openings;   a first delivery cylinder fluidly connected to the first passage opening and having a first piston and a first orifice, and a second delivery cylinder fluidly connected to the second passage opening and having a second piston and a second orifice, the first and second pistons alternately performing filling and delivery strokes;   a transfer tube arranged in the interior of the material feeding container and being pivotable in a pivot direction, the transfer tube having a pivoting tube extending therefrom and connected to a delivery line, the transfer tube configured to alternately connect the first and second delivery cylinders to the interior of the container and the delivery line;   a metallic ring element arranged about the transfer tube, the metallic ring element comprising an inlet oriented in the direction of the first and second orifices and configured as an arcuate slot, the inlet having a width corresponding to the diameter of the passage openings and having a length corresponding to an outer spacing of the passage openings, the metallic ring element further comprising first and second closure attachments associated with the first and second passage openings, respectively, the closure attachments protruding beyond an outer edge of the arcuate slot in the pivoting direction; and   a cushion arranged between the ring element and the pivoting tube, the cushion having an aperture enclosing the arcuate slot, wherein the ring element is axially displaceable relative to the pivoting tube to press against the inner surface of the container wall via the cushion element under the action of delivery pressure in the transfer tube.   
     
     
         2 . The thick matter pump as claimed in  claim 1 , wherein the container wall on an internal surface facing towards the ring element carries a replaceable wear plate provided with the first and second passage openings. 
     
     
         3 . The thick matter pump as claimed in  claim 1 , wherein the ring element has a stepped molded pocket configured to receive the cushion, the molded pocket having an external contour corresponding to the cushion and forming an outer pocket edge. 
     
     
         4 . The thick matter pump as claimed in  claim 3 , wherein the ring element is delimited in the direction of the slot by a stepped pocket wall having a height which is smaller than the outer pocket edge. 
     
     
         5 . The thick matter pump as claimed in  claim 3 , wherein an elevation of limited arcuate form and penetrated by a pivoting tube channel is arranged on a cylinder end of the pivoting tube, the elevation having an external contour corresponding to the pocket in the ring element. 
     
     
         6 . The thick matter pump as claimed in  claim 1 , wherein the cushion is a pliable or elastic material. 
     
     
         7 . The thick matter pump as claimed in  claim 1 , wherein the cushion comprises a flexible rubber material. 
     
     
         8 . The thick matter pump as claimed in  claim 1 , wherein the cushion contains an incompressible fluid.