Patent Application
20230031915
The invention relates to a sweeping device for working on a track formed of rails and sleepers, with a brush shaft consisting of a plurality of shaft portions, which is designed as a hollow shaft, having resilient sweeping elements protruding radially from it, which can be attached via at least one adjustable vertical drive to a vehicle that can travel on rails.
The ballast bed secures the track geometry against track buckling. Essential for this is the technically correct design of the ballast bed cross-section. This means that sufficient quantities of ballast are distributed as uniformly as possible and in the defined profile along the entire course of the line. In order to be able to carry out tamping in a durable manner, there must be sufficient ballast.
The ballast is removed by corresponding ballast ploughs. The ballast shoulder is profiled using shoulder ploughs, which ensures that the correct angle of the embankment is produced. The shoulder ploughs draw the ballast into the upper area of the ballast bed towards the ballast crown. There the crown plough takes up the ballast and distributes it in the track area according to the position of the baffle plates.
Finally, a sweeping unit removes residual ballast stones from the sleeper surfaces. Often, sweeping units are equipped with a transverse conveyor belt, which then either discharges excess ballast to the side or conveys it via another conveyor belt into a storage hopper. In the case of high-speed lines, the sweeping units are of particular importance; this is referred to as deep sweeping. In this process, the ballast in the middle of the sleeper cribs, which is the area between two adjacent sleepers, is swept deeper than the sleeper surface.
A sweeping device with a total of five arranged sweeping brushes distributed over the track cross-section is known from US 3,007,264. The brush shafts of the two outer sweeping brushes, each intended for sweeping a ballast shoulder, are connected to the brush shafts of the respective adjacent sweeping brushes via a cardan joint and can thus be adjusted at an angle to them, while all five sweeping brushes can be made to rotate via a common drive.
Furthermore, AT 395 875 B discloses a track maintenance machine for working on the ballast bed of a track. With a device for clearing or sweeping ballast and, if necessary, further devices intended for ballast storage and/or introduction into the track or ballast profiling, the ballast sweeping device arranged in the sleeper area consisting of three sweeping rollers which are vertically adjustable and can be rotated independently of one another by drives, are arranged one behind the other in the transverse direction of the machine and whose axes of rotation run essentially in the transverse direction of the machine. The total of three sweeping rollers only extend over the entire sleeper area, and the axes of rotation of the two outer sweeping rollers can be adjusted independently of each other in the angle to the axis of rotation of the central sweeping roller or to the track plane.
Based on this, EP 2 775 035 B1 shows a sweeping device with improved application possibilities and an adjustment option, which is implemented by a control shaft guided inside the hollow shaft with an eccentrically designed bearing.
The object of the invention is to provide a device of the kind mentioned above with greater flexibility in adapting to different sleeper shapes, as well as an increase in sweeping performance and thus the cost efficiency of the machine, with a concomitant improvement in the quality of the sweeping pattern compared to prior art.
According to the invention, these objects are achieved by way of a device according to claim 1. Dependent claims refer to advantageous embodiments of the invention.
The invention provides that at least one axis of rotation of a shaft portion is adjustable via a control shaft with control elements acting externally on the shaft portion.
This eliminates the need for a complex shaft-in-shaft set-up, in which the control shaft is designed inside the brush shaft with an internal, eccentrically designed bearing, which is responsible for the inclination of the brush shaft. This also makes the production and assembly of the components at the factory much easier. Expensive special tools or even a complex, separable shaft design are thus superfluous.
It is advantageous if the control elements are joined to the rotatably mounted control shaft and are designed in a sword-like shape.
The slim design and especially the position of the control elements is chosen accordingly so that there is no contact with sweeping elements. Unwanted wear of the sweeping elements can thus be prevented.
One embodiment of the invention provides that the control shaft is rotated via a mechanical linkage and at least one gear.
Via a corresponding linkage mechanism, a gear is actuated by a translatorily acting actuator, which adjusts the control shaft around its axis of rotation. The gear converts the translatory actuation movement into a rotatory degree of freedom that drives the control shaft. The actuator is designed as a doubleacting hydraulic cylinder, supplied via the existing, on-board hydraulic system. This makes it easy to actuate and regulate. An internally mounted position/displacement measuring system can also be used to determine the position of the piston.
It is particularly advantageous if the gear is designed as a worm gear.
Implementation as a self-locking worm gear is evidence of high process stability and reliability in the actuation of the control shaft and thus of the intervening positioning elements.
A further embodiment of the invention provides that the individual shaft portions of the brush shaft are movably connected via cardan joints.
This guarantees a robust, positive power transmission with simultaneous axial longitudinal compensation, which is required for adjustment of the multi-part brush shaft.
One embodiment provides that the brush shaft is driven by means of at least one laterally arranged chain drive.
This arrangement allows for a slim design of the structural shaft suspension. The drive sprocket is rotated by an internally flanged hydraulic motor.
It is particularly advantageous if the brush shaft consists of five shaft portions.
A five-part hollow shaft design ensures optimum adaptability to almost all common sleeper shapes, especially concrete sleepers with partially sloping surfaces. This design also completely covers the middle of the sleeper, leaving no undesirable ballast accumulation. This area is of particular importance in high-speed traffic, where the ballast in the middle of the sleeper cribs must be swept more deeply than the sleeper surface in the case of so-called deep sweeping.
A useful further development of the invention is that two control elements act on the central part of the shaft portions, with one control element each acting on the bearing point on the left and right thereof.
The symmetrical engagement of the positioning elements on the central shaft portion of the brush shaft ensures uniform power transmission and counteracts possible jamming and signs of wear caused by asymmetrical loading.
A further embodiment provides that the brush shaft as well as the control shaft with their associated drive and bearing components are arranged in a common brush box.
This forms a compact unit and enables rapid assembly and disassembly of the entire device if required.
It is also possible that the sweeping elements, which are resilient and radially arranged on the brush shaft, are made of solid material or internally hollow, tubular products.
This provides a high degree of flexibility in adapting to the condition and grain size of the loose material. Different sleeper shapes may also require a corresponding shape and design of the sweeping elements.
Furthermore, the design is characterised by a larger diameter of the hollow shaft and consequently a larger shaft circumference. This results in the accommodation of more sweeping elements compared to previous machines. Consequently, this achieves a higher sweeping performance with an even, clean sweeping pattern.
In the following, the invention is explained by way of example with reference to the accompanying figures. The following figures show in schematic illustrations:
The embodiment explained above for
The supporting frame 21 is directly connected to the brush box 22.
Supplementary to
| Number | Date | Country | Kind |
|---|---|---|---|
| A 410/2019 | Dec 2019 | AT | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2020/086635 | 12/17/2020 | WO |
