Method and device for cleaning railtrack grooves

• US 6,444,046 B1
• Filed: 06/21/1999
• Issued: 09/03/2002
• Est. Priority Date: 10/20/1997
• Status: Expired due to Fees

• Current Assignee: Florianer BAHN Forschungs-Und ErrichtungsGmbH
• Original Assignee: Florianer BAHN Forschungs-Und ErrichtungsGmbH
• Inventors: Hillbrand, Georg
• Primary Examiner(s): Gulakowski, Randy
• Assistant Examiner(s): CHAUDHRY, SAEED T
• Application Number:
  US09/331,632
• Time in Patent Office: 1,170 Days
• Field of Search: 134/23, 134/24, 134/34, 134/37, 134/10, 134/104.4, 134/172, 239/173, 239/174, 104/279, 15/55
• US Class Current: 134/34
• CPC Class Codes: E01H 1/103 in which the soiled loosening or washing liquid is removed, e.g. by suction removing liquids in general E01H1/108
• CPC Class Codes: E01H 8/125 Pneumatically or hydraulically loosening, removing or dislodging undesirable matter, e.g. removing by blowing, suction or flushing flushing devices incorporated in tramay tracks E01B21/02; Loosening or removing by means of heat built-in heating, blowing or liquid applying devices for switches E01B7/24

Abstract

A groove cleaning unit has a high pressure jet nozzle from which a cleaning liquid impinges in a high pressure jet stream inclined downwardly onto a cleaning surface and is covered by a covering screen. An exit opening for the dirt liquid mixture is placed in the cover screen. The cover screen (5) covers a piece of a railtrack (17) with a railtrack groove (3). A high pressure jet nozzle (1) is placed in the region of a front wall (8) on the jet stream side. A high pressure liquid jet stream (2) is directed onto an impingement location (4) in the railtrack groove (3) by the high pressure jet nozzle (1). A reflected liquid jet stream (11) of the high pressure liquid jet stream (2) is reflected under an angle. The angle is steeper as compared to the inclination of a lower screen wall (7) disposed inclined relative to a travel advance direction (19) and is rising forwardly. The reflected liquid jet stream (11) passes essentially immediately to an exit opening (18).

Claims

1. A method for cleaning of railtrack grooves, during travel with a cleaning unit attached to a carrier vehicle, and disposed in an essentially fixed position relative railtrack groove, disposing a sealing beam (25) resting on a surface (22) of a railtrack (17) and essentially laying on the surface (22);

wherein a high pressure aqeous liquid jet stream (2) of a cold or heated aqueous cleaning liquid is directed at a dirt layer (12) in the railtrack groove (3) to be processed by a groove cleaning unit, wherein a reflected liquid jet stream (11) of the high pressure aqueous liquid jet stream (2) reflected by a respective impact location (4) entrains the dirt and a dirt liquid mixture fed from a collection device and from a guide device to a transport apparatus, wherein the dirt liquid mixture is guided into a dirt collection device and stored or spent liquid is at least partially separated from the dirt in the dirt collection device or in a separate separation device or the dirt liquid mixture is directly carried out.

2. The method for cleaning of railtrack grooves, according to claim 1, wherein the high pressure aqueous liquid jet stream (2) directed toward the dirt layer (12) in the railtrack groove (3) to be processed by the groove cleaning unit is arranged with an impingement angle relative to the railtrack surface of from between 30 and 80 angular degrees relative to the surface of the railtrack (17), depending on the kind of the high pressure aqueous liquid jet stream (2), on the dirt in the dirt layer (12) of railtrack grooves (3) and on a travel speed.

3. The method for cleaning of rail grooves according to claim 1, wherein the high pressure aqueous liquid jet stream (2) directed by a groove cleaning unit onto the dirt deposit (12) in the railtrack groove (3) to be processed is arranged with an impingement angle relative to the railtrack surface, perpendicular to a travel direction (19) of the carrier vehicle and thus essentially perpendicular to the longitudinal direction of the railtrack groove (3), of between 90 and 30 angular degrees relative to the surface of the railtrack (17), directed against a side wall of the railtrack groove (3), depending on the kind of the high pressure aqueous liquid jet stream (2), of the dirt in the dirt deposits (12) of the railtrack groove (3).

4. The method for cleaning of railtrack grooves according to claim 1 wherein the high pressure aqueous liquid jet stream (2), formed as a forwardly and downwardly inclined jet stream in travel direction (19), in particular as a flat jet stream directed in particular perpendicular to the railtrack groove (3) is directed to a dirt deposit (12) in the railtrack groove (3) and an aqueous liquid jet stream reflected under an acute angle upwardly impinges on the guide face (7) and is deflected along the guide space (7) forwardly and upwardly.

5. The method for cleaning of railtrack grooves, according to claim 1, wherein reflected aqueous liquid jet streams (11) of the high pressure aqueous liquid jet stream (2) of a cleaning liquid, in particular water or aqueous cleaning solution, directed by the groove cleaning unit onto a dirt deposit (12) in the railtrack groove (3) to be processed, entrain dirt from the respective impingement locations (4) and transport the dirt over a guide surface at an inclined angle upwardly and are collected in a collection device together with the dirt, wherein in particular at least the overwhelming part of the solid parts and of a fluid content are directly carried out or are led with a transport device (14) into a dirt collection device.

6. The method for cleaning of railtrack grooves according to claim 1, wherein a material for decreasing of the surface tension is added to the cleaning fluid of the high pressure fluid jet stream (2).

7. The method for cleaning of railtrack grooves according to claim 1 wherein the cleaning liquid of the high pressure aqueous liquid jet stream (2) is splashed onto the dirt deposit (12) with a working pressure of between 10 bar and 2500 bar depending on the kind of the cleaning liquid, of the dirt deposit (12) and the jet stream expansion required and occurring during the cleaning.

8. A groove cleaning unit with a high pressure jet nozzle from which a cleaning liquid impinges in a high pressure jet stream inclined downwardly onto a cleaning surface and is covered by a covering screen, wherein an exit opening for the dirt liquid mixture is placed in the cover screen, wherein the cover screen (5) covers a piece of a railtrack (17) with a railtrack groove (3), a sealing beam (25) resting on a surface (22) of a railtack (17) and essentially laying on the surface (22), wherein a high pressure jet nozzle (1) is placed in the region of a front wall (8) on the jet stream side, wherein a high pressure liquid jet stream (2) is directed onto an impingement location (4) in the railtrack groove (3) by the high pressure jet nozzle (1), wherein a reflected liquid jet stream (11) of the high pressure liquid jet stream (2) is reflected under an angle, wherein the angle is steeper as compared to the inclination of a lower screen wall (7) disposed inclined relative to a travel advance direction (19) and is rising forwardly and wherein the reflected liquid jet stream (11) passes essentially immediately to an exit opening (18) or that the reflected liquid jet streams (11) are deflected under an angle, wherein the angle is equal to or flatter as compared to the inclination of the forwardly rising disposed lower screen wall (7), wherein the reflected liquid jet streams (11) are captured and pass through the exit opening (18) at the surface of the lower screen wall (7).

9. The groove cleaning unit according to claim 8, wherein the lower screen wall (7) forms a discharge channel (20) with an upper stream wall (6) and side walls (13) disposed on two sides, wherein the discharge channel (20) ends in the exit opening (18), wherein the discharge channel (20) exhibits at the railtrack surface at least the width of a railtrack groove (3) and exhibits upwardly the same, or an increasing width.

10. The groove cleaning unit according to claim 8 wherein the high pressure jet nozzle (1) is at least in travel direction (19) steeper or flatter inclined downwardly and adjustable in distance relative to the impingement location, depending on the kind and the quantity of the dirt deposit (12) in the railtrack groove (3), the respective travel speed and the pressure of the high-pressure liquid jet stream (2) and wherein the high-pressure liquid jet stream (2) is directed by the high pressure jet nozzle (1), as a flat jet stream with a width perpendicular to the direction of travel (19) and essentially is delivered impinging over the width of the railtrack groove (3), wherein an angle of between 30 and 80 angular degrees is adjustable relative to the surface of the railtrack (17).

11. The groove cleaning unit according to claim 8 wherein the high-pressure jet nozzle (1) is adjustable perpendicular to the travel direction (19), sideways, perpendicular or steeper or flatter inclined, depending on the groove shape, the kind and amount of the dirt deposit (12) in the railtrack groove (3) in order to direct high-pressure fluid jet streams (2) preferably sideways at a side wall of the railtrack groove (3).

12. The groove cleaning unit according to claim 8 wherein the exit opening (18) of the cover screen (5) leads into a collection trough (15), wherein the collection trough forms at the same time a storage container or is this feeding part of a transport device (14), from which the dirt is transported with the cleaning liquid or a part of the cleaning liquid into a dirt container, wherein the cleaning liquid with a mud part discharges toward the outside from the dirt container or passes into a storage container.

13. The groove cleaning unit according to claim 8 wherein a collection trough (15) for the dirt cleaning liquid mixture is furnished with an overflow (16) at least for the overwhelming part of the spent cleaning liquid part.

14. The groove cleaning unit according to claim 8 wherein the groove cleaning unit is placed immediately between wheel sets coordinated as close as possible to the groove cleaning unit or is placed directly in guide wheels running in the groove and wherein a separate groove cleaning unit is provided for each railtrack groove (3) of a railtrack strand.

15. A groove cleaning unit with a high pressure jet nozzle from which a cleaning fluid impinges in a high pressure jet stream inclined downwardly onto a cleaning surface and is covered by a covering screen, wherein an exit opening for the dirt fluid mixture is placed in the cover screen, wherein the cover screen (5) covers a piece of a railtrack (17) with a railtrack groove (3), wherein a high pressure jet nozzle (1) is placed in the region of a front wall (8) on the jet stream side, wherein a high pressure fluid jet stream (2) is directed onto an impingement location (4) in the railtrack groove (3) by the high pressure jet nozzle (1), wherein a reflected fluid jet stream (11) of the high pressure fluid jet stream (2) is reflected under an angle, wherein the angle is steeper as compared to the inclination of a lower screen wall (7) disposed inclined relative to a travel advance direction (19) and is rising forwardly and wherein the reflected fluid jet stream (11) passes essentially immediately to an exit opening (18) or that the reflected fluid jet streams (11) are deflected under an angle, wherein the angle is equal to or flatter as compared to the inclination of the forwardly rising disposed lower screen wall (7), wherein the reflected fluid jet streams (11) are captured and pass through the exit opening (18) at the surface of the lower screen wall (7);

wherein the lower screen wall (7) forms a discharge channel (20) with an upper stream wall (6) and side waits (13) disposed on two sides, wherein the discharge channel (20) ends in the exit opening (18), wherein the discharge channel (20) exhibits at the railtrack surface at least the width of a railtrack groove (3) and exhibits upwardly the same, or an increasing width;

wherein the side walls (13) reach down up to the surface (24) of the railtrack (17) and to a surface of a leading edge (23) on two sides of the railtrack groove (3) and end with sealing beams (25,26), wherein a sealing beam (25) is the disposed resting on a surface (22) of the railtrack (17) essentially laying on the surface (22) and wherein the sealing beam (26) is disposed resting on the surface (24) of the leading edge (23), in the case the high level distance between the surface (22) of the railtrack (17) and of the surface of the leading edge (23) exhibits the highest tolerance value, wherein the two sealing beams (25, 26) delimit the opening of the cover screen (5) sideways relative to the railtrack groove (3) and protrude in the direction of travel (19), preferably on two sides.

16. The groove cleaning unit according to claim 15 wherein the lower screen wall (7), which preferably exhibits a planar course, is reaching down to the surface of the processed railtrack (17) and ends in an edge (21) preferably nearly touching at least at a distance from the impingement point (4) of the high-pressure fluid jet streams, wherein the distance corresponds at least approximately to the length of the railtrack groove (3) processed by the high-pressure fluid jet stream.

17. The groove cleaning unit according to claim 15 wherein wherein the high pressure aqueous liquid jet stream (2) directed toward a dirt layer (12) in the railtrack groove (3) to be processed by the groove cleaning unit is arranged with an impingement angle relative to the railtrack surface of from between 30 and 80 angular degrees relative to the surface of the railtrack (17), depending on the kind of the high pressure aqueous liquid jet stream (2), on the dirt in the dirt layer (12) of railtrack grooves (3) and on a travel speed;

wherein the high pressure aqueous liquid jet stream (2) directed by a groove cleaning unit onto the dirt deposit (12) in the railtrack groove (3) to be processed is arranged with an impingement angle relative to the railtrack surface, perpendicular to a travel direction (19) of the carrier vehicle and thus essentially perpendicular to the longitudinal direction of the railtrack groove (3), of between 90 and 30 angular degrees relative to the surface of the railtrack (17), directed against a side wall of the railtrack groove (3), depending on the kind of the high pressure aqueous liquid jet stream (2), of the dirt in the dirt deposits (12) of the railtrack groove (3).

18. A groove cleaning unit with a high pressure jet nozzle from which a cleaning fluid impinges in a high pressure jet stream inclined downwardly onto a cleaning surface and is covered by a covering screen, wherein an exit opening for the dirt fluid mixture is placed in the cover screen, wherein the cover screen (5) covers a piece of a railtrack (17) with a railtrack groove (3), wherein a high pressure jet nozzle (1) is placed in the region of a front wall (8) on the jet stream side, wherein a high pressure fluid jet stream (2) is directed onto an impingement location (4) in the railtrack groove (3) by the high pressure jet nozzle (1), wherein a reflected fluid jet stream (11) of the high pressure fluid jet stream (2) is reflected under an angle, wherein the angle is steeper as compared to the inclination of a lower screen wall (7) disposed inclined relative to a travel advance direction (19) and is rising forwardly and wherein the reflected fluid jet stream (11) passes essentially immediately to an exit opening (18) or that the reflected fluid jet streams (11) are deflected under an angle, wherein the angle is equal to or flatter as compared to the inclination of the forwardly rising disposed lower screen wall (7), wherein the reflected fluid jet streams (11) are captured and pass through the exit opening (18) at the surface of the lower screen wall (7);

wherein the lower screen wall (7) forms a discharge channel (20) with an upper stream wall (6) and side walls (13) disposed on two sides, wherein the discharge channel (20) ends in the exit opening (18), wherein the discharge channel (20) exhibits at the railtrack surface at least the width of a railtrack groove (3) and exhibits upwardly the same, or an increasing width;

wherein at least a sealing beam (25) resting on a surface (22) at the railtrack (17) exhibits a steel plate several mm thick and exhibiting a thickness of from 10 to 50 min exhibits a profile with a planar or bomb shaped lower sealing face (33) and exhibits a rectangular or square cross-section.

19. A groove cleaning unit with a high pressure jet nozzle from which a cleaning fluid impinges in a high pressure jet stream inclined downwardly onto a cleaning surface and is covered by a covering screen, wherein an exit opening for the dirt fluid mixture is placed in the cover screen, wherein the cover screen (5) covers a piece of a railtrack (17) with a railtrack groove (3), wherein a high pressure jet nozzle (1) is placed in the region of a front wall (8) on the jet stream side, wherein a high pressure fluid jet stream (2) is directed onto an impingement location (4) in the railtrack groove (3) by the high pressure jet nozzle (1), wherein a reflected fluid jet stream (11) of the high pressure fluid jet stream (2) is reflected under an angle, wherein the angle is steeper as compared to the inclination of a lower screen wall (7) disposed inclined relative to a travel advance direction (19) and is rising forwardly and wherein the reflected fluid jet stream (11) passes essentially immediately to an exit opening (18) or that the reflected fluid jet streams (11) are deflected under an angle, wherein the angle is equal to or flatter as compared to the inclination of the forwardly rising disposed lower screen wall (7), wherein the reflected fluid jet streams (11) are captured and pass through the exit opening (18) at the surface of the lower screen wall (7);

wherein at the sealing beam (26), preferably however the two sealing beams (25, 26) are disposed at the coordinated side wall (13) of the cover screen (5) shiftable in height level.

20. A groove cleaning unit with a high pressure jet nozzle from which a cleaning fluid impinges in a high pressure jet stream inclined downwardly onto a cleaning surface and is covered by a covering screen, wherein an exit opening for the dirt fluid mixture is placed in the cover screen, wherein the cover screen (5) covers a piece of a railtrack (17) with a railtrack groove (3), wherein a high pressure jet nozzle (1) is placed in the region of a front wall (8) on the jet stream side, wherein a high pressure fluid jet stream (2) is directed onto an impingement location (4) in the railtrack groove (3) by the high pressure jet nozzle (1), wherein a reflected fluid jet stream (11) of the high pressure fluid jet stream (2) is reflected under an angle, wherein the angle is steeper as compared to the inclination of a lower screen wall (7) disposed inclined relative to a travel advance direction (19) and is rising forwardly and wherein the reflected fluid jet stream (11) passes essentially immediately to an exit opening (18) or that the reflected fluid jet streams (11) are deflected under an angle, wherein tie angle is equal to or flatter as compared to the inclination of the forwardly rising disposed lower screen wall (7), wherein the reflected fluid jet streams (11) are captured and pass through the exit opening (18) at the surface of the lower screen wall (7);

wherein a sealing beam (25) is disposed on a surface (22) of the railtrack (17), is furnished with a longitudinal bore hole (30), wherein the longitudinal bore hole (30) is connected to a feed line for a fluid under pressure and wherein the feed line ends with one or several longitudinal slots (31) aligned in travel direction (19) or a plurality of bore holes, opened downwardly and being in the lower disposed sealing face (33).

21. A groove cleaning unit with a high pressure jet nozzle from which a cleaning fluid impinges in a high pressure jet stream inclined downwardly onto a cleaning surface and is covered by a covering screen, wherein an exit opening for the dirt fluid mixture is placed in the cover screen, wherein the cover screen (5) covers a piece of a railtrack (17) with a railtrack groove (3), a sealing beam (25) resting on a surface (22) of a railtrack (17) essentially laying on the surface (22), wherein a high pressure jet nozzle (1) is placed in the region of a front wall (8) on the jet stream side, wherein a high pressure fluid jet stream (2) is directed onto an impingement location (4) in the railtrack groove (3) by the high pressure jet nozzle (1), wherein a reflected fluid jet stream (11) of the high pressure fluid jet stream (2) is reflected under an angle, wherein the angle is steeper as compared to the inclination of a lower screen wall (7) disposed inclined relative to a travel advance direction (19) and is rising forwardly and wherein the reflected fluid jet stream (11) passes essentially immediately to an exit opening (18) or that the reflected fluid jet streams (11) are deflected under an angle, wherein the angle is equal to or flutter as compared to the inclination of the forwardly rising disposed lower screen wall (7), wherein the reflected fluid jet streams (11) are captured and pass through the exit opening (18) at the surface of the lower screen wall (7);

wherein a sealing brush (27) is disposed in a brush support (28), horizontally inserted, is disposed sideways outside of the sealing beam (26), at the side of a leading edge (23), next to a side wall (13) in travel direction or, respectively, working direction (19), wherein the bristles (29) are aligned from top to bottom and scrubbingly end over an outer edge (23) of the leading edge (23) and exhibit a length, which amounts to a multiple, and at least a five fold of the largest allowable distance between the sealing beam (26) and the surface (24) of the leading edge (53), wherein the sealing brush (27) covers the length of the sealing beam (26) in travel direction (19) and preferably surpasses.

22. The groove cleaning unit according to claim 21 wherein bristles (29) of a brush (27) are made of plastic of a high wear resistance and or are reinforced with metal bristles, which metal bristles are preferably disposed in rows and disposed mixed.

23. A groove cleaning unit with a high pressure jet nozzle from which a cleaning fluid impinges in a high pressure jet stream inclined downwardly onto a cleaning surface and is covered by a covering screen, wherein an exit opening for the dirt fluid mixture is placed in the cover screen, wherein the cover screen (5) covers a piece of a railtrack (17) with a railtrack groove (3), wherein a high pressure jet nozzle (1) is placed in the region of a front wall (8) on the jet stream side, wherein a high pressure fluid jet stream (2) is directed onto an impingement location (4) in the railtrack groove (3) by the high pressure jet nozzle (1), wherein a reflected fluid jet stream (11) of the high pressure fluid jet stream (2) is reflected under an angle, wherein the angle is steeper as compared to the inclination of a lower screen wall (7) disposed inclined relative to a travel advance direction (19) and is rising forwardly and wherein the reflected fluid jet stream (11) passes essentially immediately to an exit opening (18) or that the reflected fluid jet streams (11) are deflected under an angle, wherein the angle is equal to or flatter as compared to the inclination of the forwardly rising disposed lower screen wall (7), wherein the reflected fluid jet streams (11) arc captured and pass through the exit opening (18) at the surface of the lower screen wall (7);

wherein the lower screen wall (7), which preferably exhibits a planar course, is reaching down to the surface of the processed railtrack (17) and ends in an edge (21) preferably nearly touching at least at a distance from the impingement point (4) of the high-pressure fluid jet streams, wherein the distance corresponds at least approximately to the length of the railtrack groove (3) processed by the high-pressure fluid jet stream;

wherein a groove seal (9) is disposed operating from the edge (21) downwardly into the railtrack groove (3), which groove seal (9), for example, protrudes into the railtrack groove (3), is made of a rigid material, preferably hinged or of elastic or of material not resisting bending, of a wear resistant material, solidly attached or formed by a sealing liquid jet stream.

24. A groove cleaning unit with a high pressure jet nozzle from which a cleaning fluid impinges in a high pressure jet stream inclined downwardly onto a cleaning surface and is covered by a covering screen, wherein an exit opening for the dirt fluid mixture is placed in the cover screen, wherein the cover screen (5) covers a piece of a railtrack (17) with a railtrack groove (3), wherein a high pressure jet nozzle (1) is placed in the region of a front wall (8) on the jet stream side, wherein a high pressure fluid jet stream (2) is directed onto an impingement location (4) in the railtrack groove (3) by the high pressure jet nozzle (1), wherein a reflected fluid jet stream (11) of the high pressure fluid jet stream (2) is reflected under an angle, wherein the angle is steeper as compared to the inclination of a lower screen wall (7) disposed inclined relative to a travel advance direction (19) and is rising forwardly and wherein the reflected fluid jet stream (11) passes essentially immediately to an exit opening (18) or that the reflected fluid jet streams (11) are deflected under an angle, wherein the angle is equal to or flatter as compared to the inclination of the forwardly rising disposed lower screen wall (7), wherein the reflected fluid jet streams (11) are captured and pass through the exit opening (18) at the surface of the lower screen wall (7);

wherein the lower screen wall (7), which preferably exhibits a planar course, is reaching down to the surface of the processed railtrack (17) and ends in an edge (21) preferably nearly touching at least at a distance from the impingement point (4) of the high-pressure fluid jet streams, wherein the distance corresponds at least approximately to the length of the railtrack groove (3) processed by the high-pressure fluid jet stream;

wherein a groove covering (10) disposed running from the edge (21) forwardly in travel direction (19) and essentially sealingly resting on the surface of the railtrack (17) to be processed, wherein the length of the groove covering (10) corresponds to a multiple of the depth of the railtrack (3), in particular at the holding back of the cleaning fluid by the dirt deposits (12) adapted in the railtrack groove (3).

25. A groove cleaning unit with a high pressure jet nozzle from which a cleaning fluid impinges in a high pressure jet stream inclined downwardly onto a cleaning surface and is covered by a covering screen, wherein an exit opening for the dirt fluid mixture is placed in the cover screen, wherein the cover screen (5) covers a piece of a railtrack (17) with a railtrack groove (3), wherein a high pressure jet nozzle (1) is placed in the region of a front wall (8) on the jet stream side, wherein a high pressure fluid jet stream (2) is directed onto an impingement location (4) in the railtrack groove (3) by the high pressure jet nozzle (1), wherein a reflected fluid jet stream (11) of the high pressure fluid jet stream (2) is reflected under an angle, wherein the angle is steeper as compared to the inclination of a lower screen wall (7) disposed inclined relative to a travel advance direction (19) and is rising forwardly and wherein the reflected fluid jet stream (11) passes essentially immediately to an exit opening (18) or that the reflected fluid jet streams (11) are deflected under an angle, wherein the angle is equal to or flatter as compared to the inclination of the forwardly rising disposed lower screen wall (7), wherein the reflected fluid jet steams (11) are captured and pass through the exit opening (18) at the surface of the lower screen wall (7);

wherein a transport device (14) comprises a bucket chain, wherein the buckets of the bucket chain at the lower half of the conveyor belt or chain, perpendicular to the travel direction (19) are attached movable through under the exit opening (18) of each groove cleaning unit.

26. Groove cleaning unit comprising

a high pressure jet nozzle from which an aqueous cleaning liquid impinges in a high pressure jet stream inclined downwardly onto a cleaning surface and is covered by a covering screen, wherein an exit opening for the dirt fluid mixture is placed in the covering screen;

side walls (13) reaching down up to the surface (24) of the railtrack (17) and to a surface of a leading edge (23) on two sides of the railtrack groove (3) and end with sealing beams (25,26), wherein a sealing beam (25) is the disposed resting on a surface (22) of the railtrack (17) essentially laying on the surface (22) and wherein the sealing beam (26) is disposed resting on the surface (24) of the leading edge (23), in the case the high level distance between the surface (22) of the railtrack (17) and of the surface of the leading edge (23) exhibits the highest tolerance value, wherein the two sealing beams (25, 26) delimit the opening of the cover screen (5) sideways relative to the railtrack groove (3) and protrude in the direction of travel (19) on two sides.