Abstract
A tamping assembly for a track-tamping machine tamping tools designed as rocker arm pairs. Each tamping tool has a pick arm mounted on a support so as to be pivotally adjustable about a pivot axis and with a hydraulic drive engaging one end and a pick on the other end. The pick arm is of single web design and is mounted on the pivot axis between two axis supports assigned to the support. A pick holder is between the pick arm and the pick. The pick holder is mounted on the pick arm to be pivotally adjustable about an adjustment axis by a pivot drive. The adjustment axis is perpendicular to the pivot axis, and the point of attack of the hydraulic drive on the pick arm, the longitudinal axis of the pick arm, and the adjustment axis lie in a common plane between the axis supports.
Claims
1. A tamping assembly for a track-tamping machine, said tamping assembly comprising: tamping tools pivotally adjustably arranged on a support guided in a tamping assembly frame in vertically adjustable movement; said tamping tools being rocker arm pairs having lower tamping pick ends configured to be inserted in a ballast bed; the lower tamping pick ends being driven in opposite directions or synchronously by an oscillating drive comprising a hydraulic drive, and being hydraulically closeable relative to one another; wherein each tamping tool has a respective pick arm mounted on the support so as to be pivotally adjustable about a respective pivot axis, each pick arm having one end that the hydraulic drive engages and another end to which at least one pick is attached; and wherein each of the pick arms has a single web configuration and has a single web that extends along a longitudinal axis of the pick arm and is mounted on the pivot axis between two axis supports associated with the support; and wherein a pick holder is provided between the pick arm and the pick, said pick holder being mounted on the pick arm so as to be pivotable about an adjustment axis by a pivot drive; wherein the adjustment axis is perpendicular to the pivot axis, and a connection of the hydraulic drive with the pick arm, the longitudinal axis of the pick arm, and the adjustment axis lie in a common plane extending between the two axis supports of the support.
2. A tamping assembly according to claim 1, wherein at least two of said pick holders mounted on the pick arm so as to be pivotally adjustable about the adjustment axis are associated with each pick arm, said pick holders being constructed as identical parts.
3. A tamping assembly according to claim 2, wherein said pick holders are mounted so as to be pivotally adjustable by means of slide bushes on the adjustment axis, which is arranged in a rotationally fixed manner in the pick arm.
4. A tamping assembly according to claim 2, wherein pivot or adjustment axes are associated with lubricant-free slide bushes made of plastic, composite material or carbon fiber.
5. A tamping assembly according to claim 1, wherein the pivot or adjustment axes are associated with lubricant-free slide bushes made of plastic, composite material or carbon fiber.
6. A tamping assembly according to claim 1, wherein the hydraulic drive acting at one end on the pick arm acts at the other end on the support via a bearing block.
7. A tamping assembly for a track-tamping machine, said tamping assembly comprising: a support guided in a tamping assembly frame for vertically adjustable movement; tamping tools supported on the support; said tamping tools each including a respective pick arm each having two ends; one of the ends of the pick arm having a pick holder supporting a pick, wherein said pick holder is mounted on the pick arm so as to be pivotable about an adjustment axis by a pivot drive, and wherein said pick forms part of a respective rocker arm pair of the respective tamping tool, said rocker arm pair having lower tamping pick ends configured to be inserted in a ballast bed and being supported so as to be hydraulically closeable relative to one another; each of the pick arms being of single web design with a respective single web thereof extending along a longitudinal axis of the pick arm and positioned between two axis supports associated with the support such that each of the pick arms is pivotably mounted on the support for pivotally adjustable movement about a respective pivot axis on the support; and the other end of the pick arm having a connection with a hydraulic drive of an oscillating drive that drives the lower tamping pick ends of the rocker arm pairs of the tamping tools in opposite directions relative to each other or synchronously with respect to each other; wherein the adjustment axis of the pick holder is perpendicular to the pivot axis of the associated pick arm; and wherein the connection of the hydraulic drive with the pick arm, the longitudinal axis of the pick arm in which the web extends, and the adjustment axis lie in a common plane that extends between the two axis supports of the support supporting the pick arm.
8. The tamping assembly according to claim 7, and further comprising at least one additional pick holder mounted on each of the pick arms so as to be pivotally adjustable about the adjustment axis thereof, said pick holders being constructed as identical parts.
9. The tamping assembly according to claim 8, wherein the pivot or adjustment axes are associated with lubricant-free slide bushes made of plastic, composite material or carbon fiber.
10. The tamping assembly according to claim 7, wherein the pivot or adjustment axes are associated with lubricant-free slide bushes made of plastic, composite material or carbon fiber.
11. The tamping assembly according to claim 7, wherein the hydraulic drive has one end acting at said end of the pick arm and another end that acts on the support via a bearing block.
12. The tamping assembly according to claim 7, wherein said pick holders are mounted so as to be pivotally adjustable using slide bushes positioned on the adjustment axis and rotationally fixed in the pick arm.
13. The tamping assembly according to claim 7, wherein the connection of the hydraulic drive with the pick arm includes a connection portion of the hydraulic arm being received between spaced portions of the pick arm both extending from the web of the pick arm so that the connection portion of the hydraulic drive is centered in said plane between the two axis supports.
Description
BRIEF DESCRIPTION OF THE INVENTION
(1) The subject matter of the invention is schematically shown in the drawings by way of example, wherein:
(2) FIG. 1 shows a conventional (prior art) fully hydraulic switch tamping assembly with fully hydraulic tamping drive in front view,
(3) FIG. 2 shows a fully hydraulic switch tamping assembly according to the invention with fully hydraulic tamping drive in front view,
(4) FIG. 3 shows a conventional switch tamping assembly on the left and one designed according to the invention on the right in a partially sectional side view,
(5) FIG. 4 shows a conventional switch tamping assembly on the left and one according to invention on the right in front view,
(6) FIG. 5 shows a pick arm in the conventional design on the left and an embodiment according to the invention on the right in an oblique view,
(7) FIG. 6 shows a pick holder in conventional design on the left and an embodiment according to the invention on the right in an oblique view and
(8) FIG. 7 shows the embodiment of the conventional pick arm bearing on the left and the embodiment according to the invention on the right in cross-section.
BRIEF DESCRIPTION OF THE PREFERRED EMBODIMENTS
(9) FIG. 1 shows a conventional switch tamping assembly 1 with guide columns 2 on which the tamping box slides up and down as support 3 for the tamping tools. The pick arm 5 is hinged to the pivot bearing 7 and the pick holder 8 so that the picks 9 can be pivoted upwards. Reference numeral 6 shows the rotary pivot drives. Via the fully hydraulic tamping drive 4, the pick arm is closed during tamping with simultaneous superimposed vibration.
(10) FIG. 2 schematically shows a switch tamping assembly 1 according to the invention with guide columns 2 on which the tamping box slides up and down as a support 3 for the tamping tools. The pick arm 5 is articulated to the pick holder 17 and the pick holder 16 so that the picks 9 can be pivoted upwards by means of the pivot drive 6. The fully hydraulic tamping drive 4 closes the pick arm during tamping with simultaneous superimposed vibration. Reference numeral 25 shows the console to which the tamping drive 4 is connected. The hydraulic drive 4 engages at one end on the pick arm 5, 10 and at the other end on the support 3 via a bearing block 25. This bearing block 25 is manufactured separately and then connected to the support 3. This allows the use of the tamping assembly 1 according to the invention also with differently designed tamping drives (e.g. eccentric drives).
(11) FIG. 3 schematically shows on the left side the design of a conventional pick arm 14 with articulated pivot bearing and pick holder as seen from the left side and on the right side the design 15 according to the invention with two pick holders 16, 17. FB shows the point of force introduction of the tamping drive 4. FB shows the reaction forces which occur at the pick plates of the pick during tamping. In the conventional design 14, the closing force FB is disadvantageously asymmetrically introduced into the pick arm bearing at a distance a. With the design according to the invention, the closing force is introduced in exactly the same plane, so that no parasitic forces and moments occur. The picks 9 of the tamping assemblies 14, 15 penetrate the ballast bed at high speed and are then strongly braked. The submerged impact forces FS that occur place a high load on the components pick arm 10a, 10b, pivot bearing 7 and pick holder 8, 16, 17 of the pivot drives 6a, 6b and the bearings 11a, 11b, 13a, 13b. In the conventional design 14, these impact forces FS are primarily introduced into the vertical guides via a much larger moment arm b than in the design c according to the invention. The acting moments and the stress on the tamping box 3 and the vertical guides 2 are thus considerably higher in the conventional design 14 than in the system 15 designed according to invention. As a result, the switch tamping assembly 15 designed according to the invention is stressed by considerably lower moments and forces. This increases the service life of the individual components and bearings and reduces wear.
(12) FIG. 4 shows on the left the conventional pick arm 14 with attachments in front view and on the right the design 15 according to the invention. FB shows the combined closing and vibration force of the tamping drive acting on the pick arm. Reference numerals 6a and 6b show the pivot drives. Reference numeral 7 is designated the adjusting bearing and reference numeral 8 the pick holder. The designation adjusting bearing 7 refers to the fact that the shaft is pressed into the adjusting bearing of component 7 and rotates with it during pivoting. Slide bushes are therefore installed in pick arm 5a and also in the pick holder 8 which rotates on the shaft of the pivot bearing 7. In the design 15 according to the invention, the pick holder 16 of the outer pick and the pick holder 17 of the inner pick sit side by side on a fixed shaft which is pressed into the pick arm 5b. The pick arms are mounted in the pick box 3 via 11a and 11b. FS indicates the plunge impact forces and FP indicates the pick compaction forces. The surface pressures are essential for the wear of the bushes. SL shows schematically the surfaces in which the axis is pressed in. PH schematically shows the surface area of the slide bushes of pick holder 8. The size of the surfaces of the two pick holders PH1 and PH2 of the design according to the invention are firstly equal and secondly considerably larger than in the conventional design PH. This means that with the design 15 according to the invention, considerably lower surface pressures occur with the same acting forces, which is associated with correspondingly reduced wear.
(13) FIG. 5 shows schematically on the left a pick arm in the conventional design 5a with two diverging webs and a design according to the invention of the pick arm 5b with only one central web in the right picture.
(14) FIG. 6 schematically shows on the left an adjusting bearing 7 and a pick holder 8 in conventional design which rotates on the axis fixed in the pivot bearing 7 and a design according to the invention of pick holders 16, 17 for the inner and outer pick. The pick holders 16 and 17 are designed as identical components. 17 corresponds to 16 rotated by 180° around the vertical axis. The pick holders 16 and 17 sit next to each other and rotate on an axis fixed in the pick arm 5b.
(15) FIG. 7 schematically shows on the left the design of the conventional pivot bearing of the pick arm and on the right the much simpler design of the pivot bearing of the pick arm according to the invention. The pick arm 5 in the conventional version is designed with two webs and is connected via a bush 20 and spacers 22 to the eye of the pick box 3 with the aid of a bolt 18 and bolted 23. To prevent the lubricating oil from escaping, radial seals 21 are fitted to the left and right of the bearing and are fixed with spacer covers 19. The design according to the invention has the single web pick arm 5 in the middle around which the eyes of the picking box 3 close. The pick arm 5 is bolted to the picking box 3 by means of the bolt 18 via lubricant-free slide bushes 20 and spacers 24.
