Device for pumping viscous material

Abstract

An apparatus for the conveying of viscous material from a container has a conveyor pump, which has a conveyor cylinder and a conveyor piston that can be moved forward and back in the conveyor cylinder, and has a measuring device for measurement of the speed of the conveyor piston. The measuring device has a control unit for control of the conveying of the viscous material in dependence on the measured speed of the conveyor piston and a waste line is branched off from a conveying line for the viscous material, which is connected to the conveyor pump, and using the control unit the conveying line can be blocked and the waste line can be released.

1 . An apparatus for the conveying of viscous material from a container, with a conveyor pump ( 16 ), which has a conveyor cylinder ( 20 ) and a conveyor piston that can be moved forward and back in the conveyor cylinder ( 20 ), and with a measuring device ( 24 ) for measurement of the speed of the conveyor piston, wherein the measuring device ( 24 ) has a control unit ( 32 ) for control of the conveying of the viscous material in dependence on the measured speed of the conveyor piston and wherein a waste line ( 36 ) is branched off from a conveying line ( 18 ) for the viscous material, which line is connected to the conveyor pump ( 16 ), and by means of the control unit ( 32 ) the conveying line ( 18 ) can be blocked and the waste line ( 36 ) can be released. 
     
     
         2 . The apparatus according to  claim 1 , wherein the measuring device ( 24 ) has a distance-measuring unit ( 26 ) for time-independent measurement of the distance traveled by the conveyor piston. 
     
     
         3 . The apparatus according to  claim 2 , wherein the conveyor piston is connected mechanically to the distance-measuring unit ( 26 ). 
     
     
         4 . The apparatus according to  claim 3 , wherein the conveyor pump ( 16 ) has a piston rod ( 28 ), which projects from the conveyor cylinder ( 20 ), is connected in fixed manner to the conveyor piston and is connected rigidly by way of connecting means ( 30 ) to a movable element of the distance-measuring unit ( 26 ). 
     
     
         5 . The apparatus according to  claim 2 , wherein the distance-measuring unit ( 26 ) is an absolute-value transmitter. 
     
     
         6 . The apparatus according to  claim 1 , wherein the waste line ( 36 ) leads to a waste container ( 38 ). 
     
     
         7 . The apparatus according to  claim 1 , further comprising a follower plate ( 12 ) for sealing of the container on an open upper side of the container, which has a material outlet to which the conveyor pump ( 16 ) is attached. 
     
     
         8 . A method for conveying of viscous material from a container by use of the apparatus ( 10 ) according to  claim 1 , wherein the viscous material is conveyed in the conveying line ( 18 ) when the measured speed of the conveyor piston lies in a predetermined tolerance range around a predetermined target speed, and wherein the viscous material is conveyed in the waste line ( 36 ) when the measured speed of the conveyor piston lies outside the tolerance range.