A tamping machine has a tamping unit for simultaneously tamping sleepers of a track that are positioned directly behind one another. Tamping unit segments are arranged one behind the other. Each tamping unit segment has a height-adjustable tamping tool carrier on which opposing tamping tools are mounted that are coupled to a vibration drive via squeezing cylinders. The respective vibration drive has an eccentric shaft with first and second eccentric discs, the axes of symmetry of which, together with a common axis of rotation, span two eccentric planes that enclose a relative angle to one another. A first squeezing cylinder is mounted on the first eccentric disc. An opposing second squeezing cylinder is mounted on the second eccentric disc. Cylinder axes of the opposing squeezing cylinders enclose a position angle which is approximated to the relative angle of the eccentric planes.

The invention relates to a method for treatment of a ballast track by means of track maintenance machine which comprises a lifting unit, having gripping rollers for gripping a track grid formed of rails and sleepers and lifting drives for lifting the track grid, and a measuring system for comparing to a target position of the track, wherein the lifting unit is set in vibration by means of a vibration exciter and the vibration is transmitted to the track grid, wherein the lifting unit is controlled by means of a control device in such a way that, during a lifting operation, the lifting unit is set in vibration, and the track grid is first lifted to above the target position and subsequently lowered to the target position. By means of the method according to the invention it is possible to carry out in a simple manner a lifting of the track grid with simultaneous stabilization of the track position.

The invention relates to a method for treatment of a ballast track by means of track maintenance machine which comprises a lifting unit, having gripping rollers for gripping a track grid formed of rails and sleepers and lifting drives for lifting the track grid, and a measuring system for comparing to a target position of the track, wherein the lifting unit is set in vibration by means of a vibration exciter and the vibration is transmitted to the track grid, wherein the lifting unit is controlled by means of a control device in such a way that, during a lifting operation, the lifting unit is set in vibration, and the track grid is first lifted to above the target position and subsequently lowered to the target position. By means of the method according to the invention it is possible to carry out in a simple manner a lifting of the track grid with simultaneous stabilization of the track position.

For tamping a track, tamping tines are squeezed towards one another in pairs by a squeezing cylinder. A vibration is superimposed on a linear lift motion of a squeezing piston movable in the squeezing cylinder. The vibration is generated by a vibration piston which is arranged in the squeezing cylinder and which is movable independently of the squeezing piston.

For tamping a track, tamping tines are squeezed towards one another in pairs by a squeezing cylinder. A vibration is superimposed on a linear lift motion of a squeezing piston movable in the squeezing cylinder. The vibration is generated by a vibration piston which is arranged in the squeezing cylinder and which is movable independently of the squeezing piston.

A tamping unit for tamping sleepers of a track includes a tool carrier supported in a lowerable manner on an assembly frame, on which two pivot levers with tamping tools are mounted so as to be squeezable toward one another and, while being actuatable with a vibration, are rotatable about a respective rotation axis. A sensor for recording a pivot angle of a pivoting motion about the related rotation axis is associated with at least one pivot lever. The sensor has a multipart configuration with a first sensor part fastened to the tool carrier and a second sensor part fastened to the pivot lever. In this manner, sensitive sensor components in the first sensor part are subjected to lessened stress since the tool carrier merely performs a lowering or lifting motion during a tamping operation. A method for operating the tamping unit is also provided.

A tamping unit for tamping sleepers of a track includes a tool carrier supported in a lowerable manner on an assembly frame, on which two pivot levers with tamping tools are mounted so as to be squeezable toward one another and, while being actuatable with a vibration, are rotatable about a respective rotation axis. A sensor for recording a pivot angle of a pivoting motion about the related rotation axis is associated with at least one pivot lever. The sensor has a multipart configuration with a first sensor part fastened to the tool carrier and a second sensor part fastened to the pivot lever. In this manner, sensitive sensor components in the first sensor part are subjected to lessened stress since the tool carrier merely performs a lowering or lifting motion during a tamping operation. A method for operating the tamping unit is also provided.

A method for the correction of vertical position error of a track by a track tamping machine and a dynamic track stabilizer. Starting from a registered actual position, an over-lift value is prescribed for a treated track location with which the track is lifted into a preliminary over-lift track position and tamped. The track is subsequently lowered by dynamic stabilization into a resulting final track position. In this, a smoothed actual position course is formed from a course of the actual track position, wherein an over-lift value is prescribed for the treated track location in dependence of the course of the actual track position with regard to the smoothed actual position course. In this way, only short-wave track faults are treated with an over-lift value.

A method for the correction of vertical position error of a track by a track tamping machine and a dynamic track stabilizer. Starting from a registered actual position, an over-lift value is prescribed for a treated track location with which the track is lifted into a preliminary over-lift track position and tamped. The track is subsequently lowered by dynamic stabilization into a resulting final track position. In this, a smoothed actual position course is formed from a course of the actual track position, wherein an over-lift value is prescribed for the treated track location in dependence of the course of the actual track position with regard to the smoothed actual position course. In this way, only short-wave track faults are treated with an over-lift value.

A track-tamping machine (100) for compressing the ballast bed of a track comprises a tamping assembly group that has at least two tamping assemblies (ST), which are arranged in a row and can be moved transversely to the track-tamping machine longitudinal direction (AR) by a transverse-movement device, in order to tamp the track on each track-tamping machine side (R, L). The tamping assembly group (V, H) is rotatably mounted on a support (18) for the purpose of a rotational adjustment about a track-tamping machine vertical axis (A). At least two tamping assembly groups (V, H) are arranged one behind the other in the track-tamping machine longitudinal direction (A, R), said groups being rotatably mounted about the track-tamping machine vertical axis (A) via a common rotational device (2), wherein the tamping assemblies (ST) of the tamping assembly groups (V, H) can be moved independently of one another transversely to the track-tamping machine longitudinal direction (AR) and can be lifted and lowered relative to the consoles (3) independently of one another.