EP3870758A1

EP3870758A1 - Tamping assembly for tamping sleepers of a track

Info

Publication number: EP3870758A1
Application number: EP19779783.0A
Authority: EP
Inventors: Thomas Philipp
Original assignee: Plasser und Theurer Export Von Bahnbaumaschinen GmbH
Current assignee: Plasser und Theurer Export Von Bahnbaumaschinen GmbH
Priority date: 2018-10-24
Filing date: 2019-09-24
Publication date: 2021-09-01
Also published as: WO2020083590A1; EA202100113A1; CN112840080A; EA039948B1; AT521673A4; CN112840080B; US20220034043A1; AT521673B1

Abstract

The invention relates to a tamping assembly (1) for tamping sleepers (5) of a track, comprising a tamping unit having opposing tamping tools (13, 14) mounted on a height-adjustable tool carrier (7) and each coupled to a vibration drive (9) via a servo drive (10, 12), wherein every tamping tool (13, 14) comprises a pivot lever (16, 17) that can rotate about a pivot axis (15) and at least one tamping tool holder for receiving at least one tamping pick. A first servo drive (10) is directly coupled to the vibration drive (9) and hingedly connected to a first pivot lever (16) and a second servo drive (12) is coupled to the vibration drive (9) via a separate coupling unit (11) and hingedly connected to a lever arm (25) mounted on the tool carrier (7) and a second pivot lever (17).

Description

description

Tamping unit for tamping sleepers on a track

Technical field

The invention relates to a tamping unit for tamping sleepers of a track, comprising a tamping unit with opposing tamping tools mounted on a height-adjustable tool carrier, each of which is coupled to an oscillating drive via an auxiliary drive, each tamping tool having a pivoting lever which can be rotated about a pivot axis and at least comprises a tamping tool holder for receiving at least one tamping pick.

State of the art

[02] To restore or maintain a given track position, tracks with ballast bedding are regularly processed using a tamping machine. The tamping machine travels on the track and lifts the track grate, which is formed from sleepers and rails, to a target level using a lifting / straightening unit. The new track position is fixed by tamping the sleepers with a tamping unit. The tamping unit comprises tamping tools with tamping picks, which are subjected to vibration during a tamping process and plunge into the ballast bed and are placed next to each other. The ballast is compacted below the respective threshold.

Such tamping units for tamping sleepers of a track have been known for a long time. For example, AT 343 168 B discloses a

Tamping unit with a tool holder on which an oscillation drive and two rotatably mounted tamping tools are arranged. Each tamping tool includes a swivel arm that is connected to the vibration drive via an associated auxiliary drive. The

Side drives are on opposite sides of the

Vibration drive approximately on a common axis

aligned. The total dimension of the tamping unit in the longitudinal direction of the rail is thus approximately twice the length of an auxiliary drive and

exceeds a usual threshold distance. Such a design is therefore not suitable for an arrangement of several identical

Tamping units within a machine for simultaneous tamping of adjacent sleepers.

[04] A tamping unit with reduced dimensions is in the Austrian

Patent application A 325/2017 disclosed. Here are side by side

arranged auxiliary drives supported on consoles, which in turn are connected to a common vibration drive. Although this design is particularly compact, the side drives arranged side by side result in moments about a vertical axis during operation. These moments must be taken up by appropriately dimensioned components.

Summary of the invention

The invention is based, for a tamping unit the task

type mentioned above to provide an improved design over the prior art.

According to the invention, this object is achieved by the features of

Claim 1. Dependent claims indicate advantageous embodiments of the invention.

It is envisaged that a first auxiliary drive directly with the

Vibration drive coupled and articulated with a first pivot lever that a second auxiliary drive via a separate

Coupling unit coupled to the vibration drive and articulated with a rocker mounted on the tool carrier and a second pivot lever. In this way, the tamping unit can be designed very compactly with auxiliary drives arranged one below the other, forces and moments occurring during operation being easy to control. The dimensioning of the individual components does not lead to any

Weight gain compared to conventional tamping units with auxiliary drives connected directly opposite to the vibration drive and swivel arms spread outwards. In the case of the invention Arrangement eliminates the need for the spread swivel arms, whereby the additional mass of the coupling unit is compensated.

[08] An improvement in the kinematic conditions provides that the

Pivot axes of the two pivot levers are arranged at different heights. This measure brings about balanced leverage on the two tamping tools during operation by reducing the leverage ratio of the two

Swivel levers are aligned. In addition, the same effect

Stroke paths of the side drives have the same side paths at the free ends of the tamping tools.

In an advantageous embodiment of the invention, the

Vibration drive an eccentric shaft, being on a first

eccentric shaft section a joint eye of the first auxiliary drive is mounted and a joint eye of the coupling unit is mounted on a second eccentric shaft section. The vibrational movements transmitted from the vibratory drive to the articulated eyes are exactly predetermined by counter forces independent of eccentricities of the eccentric shaft. This advantage does not apply to other vibration generators that generate vibration by means of imbalance or by pulsating a hydraulic cylinder.

It makes sense if the first eccentric shaft section and the second eccentric shaft section have different eccentricities. The respective eccentricity is based on the kinematic

Arrangement of the vibration-transmitting components adjustable. This ensures that the same at each tamping end

Vibration amplitude with approximately the same impact force acts on the ballast to be compacted.

In a further improvement, each add-on drive includes one

Hydraulic cylinder with an active axis, with all active axes in a common, normal to the swivel axes

Plane of symmetry. This ensures that all components for the transfer of the auxiliary forces are loaded symmetrically and that no disturbing moments occur. It is advantageous if the coupling unit comprises two coupling arms which are arranged symmetrically to the plane of symmetry and / or if the rocker comprises two swing arms which are symmetrical to the

Plane of symmetry are arranged. Then essentially only tensile and compressive forces act on the coupling unit or the rocker arm, whereby an optimized dimensioning of the two coupling arms or rocker arms is facilitated.

For a uniform transmission of the vibrational forces to the second tamping tool, it is advantageous if a connection of the second

Auxiliary drive with the coupling unit is designed as a swivel joint with an axis of rotation aligned parallel to the swivel axes. In this way, the second auxiliary drive forms the coupling of a double rocker arm with optimal support of the forces prevailing during operation.

It is advantageous if the connection of the second ordering drive to the coupling unit and to the rocker is designed as a common swivel joint. This reduces the number of components and the associated wear.

In addition, the kinematics of the arrangement is particularly advantageous if the

Swing arm is rotatably mounted about the pivot axis of the first pivot lever. This measure also leads to a reduction in

Number of components by using an existing swivel. For example, only an already provided pivot pin is longer for the additional mounting of the rocker.

[16] In an advantageous development of the tamping unit, there are several

Height-adjustable tool carrier mounted in a common unit frame. In this way, the compact design is used to create a multi-sleeper tamping unit, with several identical

Darning units are arranged. The one behind the other in common

Stuffing units mounted on the unit frame can then be lowered together into a ballast bed in order to simultaneously stuff several sleepers lying next to each other. Brief description of the drawings

[17] The invention is explained below by way of example with reference to the accompanying figures. It show in schematic

Presentation:

Fig. 1 side view of a tamping unit

2 front view of the tamping unit according to FIG. 1st

3 kinematics according to FIG. 1st

Fig. 4 alternative kinematics

Description of the embodiments

The tamping unit 1 shown in FIGS. 1 and 2 comprises one

Unit frame 2, which is attached to a machine frame 3 of a track construction machine not described in detail. During work, the track construction machine travels on a track with a ballast bed 4

Thresholds 5 and rails 6 fastened thereon. Thresholds 5 are stuffed in sequence by means of the tamping unit 1.

[19] In the assembly frame 2, a tool carrier 7 is guided so as to be adjustable in height, with a lowering or swiveling movement being carried out by means of an assigned flute adjustment drive 8. On the tool carrier 7 is a

Vibration drive 9 arranged, at least a first

Add-on drive 10 and a separate coupling unit 11 for a second add-on drive 12 are connected. In addition, at least a first tamping tool 13 and a second tamping tool 14 are rotatably mounted on the tool carrier 7 about a respective pivot axis 15. Each stuffing tool 13, 14 comprises a pivot lever 16, 17 and one

Darning tool holder 18 for receiving at least one darning pick 19.

[20] As the vibration drive 9, for example, an eccentric drive with a rotating eccentric shaft is used, with an assigned eccentricity ei, Q2 specifying an oscillation amplitude for each tamping tool 13, 14 and being adjustable. A rotation speed determines the oscillation frequency. The respective add-on drive 10, 12 is designed as a hydraulic drive with a hydraulic cylinder and a control or regulating valve. The respective effective axis 20 of the hydraulic cylinder is advantageously in a common, normal to the

Pivot axes 15 aligned plane of symmetry 21.

[21] To transmit an oscillating movement 22 and one

Order movement 23 on the first tamping tool 13 is the first

Add-on drive 13 coupled directly to the vibration drive 9 and articulated with a swivel joint 24 with the swivel lever 16 of the first

Darning tool 13 connected. In the exemplary embodiment, an articulated eye of the hydraulic cylinder is on a first eccentric section of the

Eccentric shaft mounted. In this way, the whole first swings

Add-on drive 13 with rotating eccentric shaft. This

Vibration movement 22 is caused by the application of the first

Supplementary drive 13 superimposed on the order movement 23.

[22] With the second tamping tool 14, the movement is transmitted

other way. Here, the second auxiliary drive 12 is coupled to the vibration drive 9 via the separate coupling unit 11 and is supported by a rocker 25 mounted on the tool carrier 7. in the

In the exemplary embodiment, the connection between the coupling unit 11 and the second auxiliary drive 12 is designed as a swivel joint 24. The coupling unit 11 is mounted with a joint eye on a second eccentric section of the eccentric shaft. The coupling unit functions here as a connecting rod for converting the circular movement of the eccentric shaft into an oscillating movement of the second auxiliary drive 12. FIG. 3 shows the kinematics of this arrangement. For better illustration, the eccentricities ei, Q2 are shown enlarged. Drawn-in fixed bearings 26 indicate the bearing locations of the components on the tool carrier 7.

[23] Another embodiment is shown in FIG. 4. Here, the coupling unit 11 is rigidly connected to the second auxiliary drive 12 and with a link-like guide 27 on the second eccentric section of the

Eccentric shaft mounted. In this way, only movements in the effective axis direction are transmitted from the eccentric shaft to the coupling unit 11 and thus to the second auxiliary drive 12.

[24] The eccentricities ei, Q2 of the first eccentric shaft section and the second eccentric shaft section are preferably around 180 ° staggered to achieve a mass balance in the vibration generation. In addition, it is advantageous to design the two eccentricities ei, Q2 differently. The respective eccentricity ei, Q2 is then optimally adapted to the kinematic arrangement of the associated tamping tool 13, 14, so that all tamping pick ends always have the same vibration amplitude during operation.

For a symmetrical power transmission to the second pivot lever 17, the coupling unit 11 and the rocker 23 each have two arms which are arranged symmetrically to the plane of symmetry 21. Each coupling arm has an articulated eye. The second eccentric section of the eccentric shaft is divided into two, the two articulated eyes of the

Coupling unit 11 are mounted on both sides of the hinge eye of the first auxiliary drive 10. In this way, no moments act on the eccentric shaft around a vertical axis during operation.

[26] The new arrangement of the motion-transmitting elements enables a very compact construction of the tamping unit 1. The auxiliary drives 10, 12 are arranged one below the other, so that the overall dimension of the

The tamping unit 1 in the longitudinal direction of the rail only slightly exceeds the length of an auxiliary drive 10, 12. In addition, the vibration drive 9 is not arranged symmetrically between the two tamping tools 13, 14, as is the case with conventional tamping units. The present arrangement of the vibration drive 9 above the second tamping tool 14 creates space for a central arrangement of the height adjustment drive 8. The central force transmission thus achieved when lowering and lifting the tool carrier 7 protects longitudinal guides 28 on the unit frame 2 because no moments occur about a transverse axis.

[27] In a tamping unit 1 for tamping a threshold 5

Usually four tamping units 29 are arranged side by side, a tamping unit 29 being used on each side of a rail 6. The present compact design also enables a plurality of identical stuffing units 29 to be arranged in succession in one

Unit frame 2. Each tamping unit 29 is attached separately

Longitudinal guides 28 guided and by means of its own height adjustment drive 8 can be lowered or raised. In this way, several side-by-side sleepers 5 can be stuffed at the same time in one operation.

Claims

1. tamping unit (1) for tamping sleepers (5) of a track, comprising a tamping unit (29) with opposite, on one

Height-adjustable tool carrier (7) mounted tamping tools (13, 14), each of which is coupled to an oscillation drive (9) via an auxiliary drive (10, 12), each tamping tool (13, 14) having a swivel lever (13) that can be rotated about a swivel axis (15). 16, 17) and at least one tamping tool holder (18) for receiving at least one tamping pick (19), thereby

characterized in that a first auxiliary drive (10) directly with the

Vibration drive (9) coupled and articulated to a first pivot lever (16) that a second auxiliary drive (12) is coupled to the vibration drive (9) via a separate coupling unit (11) and to a rocker (25) mounted on the tool carrier (7) ) and a second pivot lever (17) is articulated.

2. tamping unit (1) according to claim 1, characterized in that the pivot axes (15) of the two pivot levers (16, 17) are arranged at different heights.

3. tamping unit (1) according to claim 1 or 2, characterized in that the vibration drive (9) comprises an eccentric shaft, that a hinge eye of the first auxiliary drive (10) is mounted on a first eccentric shaft section and that on a second eccentric shaft section

Articulated eye of the coupling unit (11) is mounted.

4. tamping unit (1) according to claim 3, characterized in that the first eccentric shaft section and the second eccentric shaft section have different eccentricities (ei, 62).

5. tamping unit (1) according to any one of claims 1 to 4, characterized

characterized in that each auxiliary drive (10, 12) with a hydraulic cylinder an effective axis (20) and that all effective axes (20) lie in a common plane of symmetry (21) oriented normal to the swivel axes (15).

6. tamping unit (1) according to claim 5, characterized in that the coupling unit (11) comprises two coupling arms which are arranged symmetrically to the plane of symmetry (21) and / or that the rocker (25) comprises two rocker arms which are symmetrical to the plane of symmetry ( 21) are arranged.

7. tamping unit (1) according to any one of claims 1 to 6, characterized

characterized in that a connection of the second auxiliary drive (12) to the coupling unit (11) is designed as a swivel joint (24) with an axis of rotation aligned parallel to the swivel axes (15).

8. tamping unit (1) according to claim 7, characterized in that the connection of the second ordering drive (12) with the coupling unit (11) and with the rocker (25) is designed as a common swivel joint (24).

9. tamping unit (1) according to one of claims 1 to 8, characterized

characterized in that the rocker (25) is rotatably mounted about the pivot axis (15) of the first pivot lever (16).

10. tamping unit (1) according to any one of claims 1 to 9, characterized

characterized in that several height-adjustable tool carriers (7) are mounted in a common unit frame (2).