# Patent

## Title
Method of cleaning ballast

## Abstract

A method of cleaning encrusted ballast comprises the steps of screening the encrusted ballast to separate detritus from the ballast, washing the screened ballast with water while removing the separated detritus on a conveyor belt unit, clarifying the washing water to produce a clarified water portion and washing water sludge, and disposing of the washing water sludge by moving it to the detritus on the conveyor belt unit for common removal with the detritus.

## Background
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of cleaning encrusted ballast supporting a track, which comprises the steps of screening the encrusted ballast to separate detritus from the ballast, and washing the screened ballast with water while removing the separated detritus on a conveyor belt unit.
2. Description of the Prior Art
British patent No. 1,519,316 discloses such a method. In this method, the washing water flows onto the track so that a very large amount of water is consumed.
SUMMARY OF THE INVENTION
It is the primary object of this invention to improve a method of cleaning ballast by screening and washing with water.
This is accomplished according to the invention by screening the encrusted ballast to separate detritus from the ballast, washing the screened ballast with water while removing the separated detritus on a conveyor belt unit, clarifying the washing water to produce a clarified water portion and washing water sludge, and disposing of the washing water sludge by moving it to the detritus on the conveyor belt unit for common removal with the detritus.
Depositing the washing water sludge on the detritus for common removal therewith has the advantage that the more or less liquid sludge forms a viscous mass with the detritus whereby the detritus serves as a carrier material for the sludge so that the sludge will not flow off but will be removed with the detritus to a storage car. This does away with costly conveying and storing units for the washing weater sludge.



BRIEF DESCRIPTION OF THE DRAWING
The above and other objects, advantages and features of the invention will become more apparent from the following detailed description of a now preferred embodiment, taken in conjunction with the accompanying, somewhat schematic drawing wherein
FIGS. 1 and 2 show a side view of a generally conventional ballast cleaning machine, FIG. 2 being the continuation of FIG. 1.



DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring to the drawing, there is shown the portion of ballast cleaning machine 1 which involves the method of the present invention. The machine is comprised of a number of cars 2 coupled to each other and supported by undercarriages 3 for movement on track 4 in an operating direction indicated by arrow 5. As is well known, encrusted ballast 6 supporting track 4 is removed from underneath the track by an endless excavating chain (not shown), and the excavated encrusted ballast is conveyed by conveyor belt 7 to screening unit 8, which is vibrated by vibrator 9, and where the encrusted ballast 6 is screened to separate detritus 13 from the ballast.
The mechanically screened ballast is conveyed by conveyor belt 10 to wash installation 11 where it is washed with water 12 sprayed onto the screened ballast. The doubly-cleaned ballast 6 is then returned to the track in a manner well known and not illustrated herein.
At the same time and while the screened ballast is washed, the separated detritus 13 is removed from screening unit 8 on conveyor belt unit 14, which conveys the detritus to a storage car 15. Washing water 12 is pumped from wash installation 11 through conduit 16 to water clarifying installation 17 where the washing water is clarified to produce a clarified water portion and washing water sludge 18. This washing water sludge is disposed by pumping it by pump 19 to detritus 13 on conveyor belt unit 14 where it is removed with the detritus to storage car 15. The detritus serves as a carrier material for the liquid washing water sludge during the conveyance on conveyor belt unit 14. Flow-off of washing water sludge 18 from conveyor belt unit 14 can be avoided by properly metering the pumped amount of washing water sludge in dependence on the consistency of detritus 13.

## Claims

1. A method of cleaning encrusted ballast supporting a track, which comprises the steps of
(a) screening the encrusted ballast to separate detritus from the ballast,
(b) washing the screened ballast with water while removing the separated detritus on a conveyor belt unit,
(c) clarifying the washing water to produce a clarified water portion and washing water sludge, and
(d) disposing of the washing water sludge by moving it to the detritus on the conveyor belt unit for common removal with the detritus.