Scraper bar for a scraper blade of a road milling machine
The invention relates to a scraper bar ( 20 ) for a scraper blade ( 68 ) of a road milling machine, having a carrier ( 10 ) that comprises a front side and a rearward installation surface ( 17 ), the carrier ( 10 ) comprising a cutting-element receptacle ( 13 ), cutting elements ( 30 ) being held, serially arranged along a longitudinal axis (L) extending in a width direction of the carrier ( 10 ), on or in the cutting-element receptacle ( 13 ), and the cutting elements ( 30 ) comprising a cutting edge ( 35.1 ) that transitions indirectly or directly into a rake surface ( 35 ). In order to improve the working result, provision is made according to the present invention that at least for some of the cutting elements ( 30 ), the cutting edge ( 35.1 ) is set at least locally not parallel to the longitudinal axis (L).
1. A scraper bar for a scraper blade of a road milling machine, the scraper bar comprising:
a carrier including a front side, a rear-side installation surface, and a cutting-element receptacle; and
a plurality of cutting elements serially arranged along a longitudinal axis extending in a width direction of the carrier on the cutting-element receptacle, each of the cutting elements including a cutting edge that transitions indirectly or directly into a rake surface;
wherein the cutting edge of at least some of the cutting elements extends along the width direction and is at least partially set at an inclination angle not parallel to the longitudinal axis.
2. The scraper bar of claim 1 , wherein:
at least some of the cutting elements include two of the cutting edges, the two cutting edges being at an angle to one another, and the two cutting edges each being at least partially set at an inclination angle not parallel to the longitudinal axis.
3. The scraper bar of claim 1 , wherein:
at least some of the cutting elements include two limbs at an angle to one another, each of the two limbs including one of the cutting edges at least partially set at an inclination angle not parallel to the longitudinal axis.
4. The scraper bar of claim 1 , wherein:
at least some of the cutting elements include a secondary cutting edge extending transversely to the cutting edge.
5. The scraper bar of claim 1 , wherein:
at least some of the cutting elements include abutment surfaces, the serial arrangement of the cutting elements being provided by abutment of the abutment surfaces of adjacent cutting elements with one another; and
the cutting edge of each of the cutting elements extends in a region between the abutment surfaces of the respective cutting element.
6. The scraper bar of claim 5 , wherein:
the cutting edge of each of the cutting elements extends to the abutment surfaces of the respective cutting element.
7. The scraper bar of claim 1 , wherein:
at least some of the cutting elements include two of the rake surfaces, the two rake surfaces adjoining one another indirectly or directly at a secondary cutting edge of the respective cutting element; and
the two rake surfaces are at a roof-shaped angle to one another.
8. The scraper bar of claim 1 , wherein:
the plurality of cutting elements serially arranged along the longitudinal axis are arranged such that the cutting edges form a zigzag-shaped structure.
9. The scraper bar of claim 1 , wherein:
the plurality of cutting elements serially arranged along the longitudinal axis are arranged such that the cutting edges form a sawtooth-shaped structure.
10. The scraper bar of claim 1 , wherein:
the inclination angle of the cutting edges is in an angle range between 2 degrees and 28 degrees with respect to the longitudinal axis.
11. The scraper bar of claim 10 , wherein:
the angle range is between 10 degrees and 20 degrees.
12. The scraper bar of claim 1 , wherein:
the carrier includes a bottom surface adjacent to the cutting elements, the bottom surface extending rearward relative to the cutting edges; and
the scraper bar includes one or more skid runners arranged on the bottom surface, the skid runners being made of a hard material harder than the carrier.
13. The scraper bar of claim 12 , wherein:
the bottom surface of the carrier has one or more receptacles recessed into the bottom surface, and each of the one or more skid runners is at least partly received in a respective one of the receptacles.
14. The scraper bar of claim 12 , wherein:
the carrier is configured such that when the scraper bar is installed on a scraper blade of a milling machine, the bottom surface of the carrier is inclined rearwardly upward with respect to a horizontal line.
15. The scraper bar of claim 1 , wherein:
the carrier includes an extension projecting rearward beyond the rear-side installation surface, the extension including a support surface such that the rear-side installation surface and the support surface enclose an angle.
16. The scraper bar of claim 1 , wherein:
the cutting-element receptacle includes a plurality of elevations, and at least some of the cutting elements include a depression, each of the elevations engaging a respective one of the depressions.
17. The scraper bar of claim 16 , wherein:
the cutting-element receptacle is assembled from a plurality of sub-receptacles, each sub-receptacle including at least one of the elevations.
18. The scraper bar of claim 1 , wherein:
the cutting-element receptacle includes a plurality of depressions, and at least some of the cutting elements include an elevation, each of the elevations engaging a respective one of the depressions.
19. The scraper bar of claim 18 , wherein:
the cutting-element receptacle is assembled from a plurality of sub-receptacles, each sub-receptacle including at least one of the depressions.
20. The scraper bar of claim 1 , wherein:
the cutting-element receptacle includes a flat placement surface extending along the longitudinal axis; and
the cutting elements are each joined to the placement surface with a solder material.
21. The scraper bar of claim 1 , wherein:
the carrier has a width parallel to the longitudinal axis, a height perpendicular to the longitudinal axis, and a depth perpendicular to the width and the height, wherein the width is greater than the height and the width is greater than the depth.
22. The scraper bar of claim 1 , wherein:
the carrier includes receptacles defined through the rear-side installation surface for receiving fasteners for attaching the carrier to a scraper blade.
23. The scraper bar of claim 22 , wherein:
the front side of the carrier includes a scraper surface extending generally parallel to the rear-side installation surface; and
the receptacles penetrate the scraper surface and the rear-side installation surface.
24. The scraper bar of claim 1 , wherein:
at least some of the cutting edges of the cutting elements lie in one plane.
25. The scraper bar of claim 1 , wherein:
at least some of the rake surfaces of the cutting elements are arranged parallel to one another.
26. The scraper bar of claim 1 , in combination with:
a height-adjustable scraper blade for a road milling machine; and
a plurality of additional scraper bars, the scraper bars all being mounted on an underside of the scraper blade.