Tamping unit and method for tamping sleepers of a track

Abstract

The invention relates to a tamping unit segment for tamping sleepers of a track (38), with tamping tools mounted on a height-adjustable tool carrier opposite one another with respect to a vertical centre plane, which are each connected to a squeeze drive for generating a squeezing movement. A lever arm with a connecting part projecting above the centre plane is arranged on each tamping tool, with the connecting part of the respective lever arm being connected to the assigned squeeze drive. This arrangement results in an almost symmetrical design of all drive elements, with an optimized load situation during operation.

1 . A tamping unit segment for tamping sleepers of a track, with tamping tools mounted on a height-adjustable tool carrier opposite one another with respect to a vertical centre plane, which are each connected to a squeeze drive for generating a squeezing movement, wherein a lever arm with a connecting part projecting over the centre plane is arranged on each tamping tool and in that the connecting part of the respective lever arm is connected to the assigned squeeze drive. 
     
     
         2 . The tamping unit segment according to  claim 1 , characterized in that wherein the one lever arm protrudes through a fork-shaped opening of the other lever arm. 
     
     
         3 . The tamping unit segment according to  claim 1 , wherein an effecting axis of the respective squeeze drive forms an acute angle with the centre plane, in particular an angle of up to 30°. 
     
     
         4 . The tamping unit segment according to  claim 1 , wherein each squeeze drive is connected to an eccentric shaft of a vibration drive. 
     
     
         5 . The tamping unit segment according to  claim 4 , characterized in that wherein equalizing masses are arranged on the eccentric shaft. 
     
     
         6 . The tamping unit segment according to  claim 1 , wherein each squeeze drive is set up as a hydraulic cylinder for generating a vibration superimposed on the squeezing movement. 
     
     
         7 . The tamping unit segment according to  claim 1 , wherein each squeeze drive is coupled to a distance sensor to record an actuating distance. 
     
     
         8 . The tamping unit segment according to  claim 1 , wherein each squeeze drive is coupled to an adjustable limit stop device in such a way that a limit stop element can be moved against a limit stop through an actuation of the squeeze drive. 
     
     
         9 . The tamping unit segment according to  claim 8 , wherein the respective limit stop device comprises a spindle and a limit stop element arranged to rotate thereon. 
     
     
         10 . The tamping unit segment according to  claim 8 , wherein the respective limit stop device comprises an adjustable distance element which can be moved by means of an actuating mechanism from a pivoted-out position to a position between the limit stop and the limit stop element. 
     
     
         11 . The tamping unit segment according to  claim 1 , wherein each tamping tool comprises a tamping tine holder with two tamping tines fastened therein. 
     
     
         12 . The tamping unit segment according to  claim 1 , wherein at least one tamping tine of the respective tamping tool is arranged in a tamping tine holder that can be tilted upwards. 
     
     
         13 . The tamping unit for simultaneous tamping of adjacent sleepers of a track, wherein a plurality of tamping unit segments according to  claim 1  are arranged one behind the other and that each tamping unit segment in particular is able to be adjusted in height separately by means of an assigned height-adjustment drive. 
     
     
         14 . A method for operating a tamping unit segment according to  claim 1 , wherein the tamping tools inserted into a ballast bed during a squeezing process are squeezed by pulling the connecting part of the respective lever arm upwards by means of the assigned squeeze drive. 
     
     
         15 . The method for operating a tamping unit according to  claim 13 , wherein, with the tamping unit segments arranged one behind the other, a respectively assigned limit stop device is adjusted in at least some of the squeeze drives to adjust to a changed sleeper spacing by moving a distance element between a limit stop and a limit stop element using an actuating mechanism.