Scraper device, as well as construction machine

Abstract

A scraper device for a milling drum mounted in a construction machine at a machine frame between lateral walls with a milling drum axis, with a two-part scraper blade arranged in a height-adjustable fashion behind the milling drum when seen in the direction of travel, the lower part of which can glide over the ground surface milled off by the milling drum, where the lower part of the scraper blade is adjustable in height when in operating position, it is provided that the upper part of the scraper blade is attached, at the upper end, to swivel about a swivelling axis parallel to the axis of the milling drum.

Claims

1. A construction machine, comprising: a machine frame; a milling drum mounted to rotate about a milling drum axis, the milling drum axis being fixed relative to the machine frame; a scraper blade located behind the milling drum with reference to a direction of travel of the construction machine, the scraper blade including an upper part and a lower part, the lower part being movable in a sliding non-pivotal motion relative to the upper part; a lifting actuator connected between the upper and lower parts to slide the lower part relative to the upper part between a downward extended position and an upward retracted position; and a swiveling actuator separate from the lifting actuator, the swiveling actuator being connected between the upper part of the scraper blade and a fixed part fixed relative to the machine frame, the swiveling actuator being configured to extend to pivot the scraper blade upward about a swiveling axis parallel to and spaced apart from the milling drum axis.

2. The construction machine of claim 1, wherein: the swiveling actuator comprises a piston-cylinder unit.

3. The construction machine of claim 1, wherein: the swiveling axis is fixed in height relative to the machine frame.

4. The construction machine of claim 1, wherein: the swiveling actuator is pivotally connected to the upper part of the scraper blade at a pivotal connection having a pivotal axis lower in height than the swiveling axis.

5. The construction machine of claim 4, wherein: the swiveling axis is offset rearward from the pivotal axis of the pivotal connection relative to the direction of travel.

6. The construction machine of claim 1, wherein: the swiveling actuator is pivotally connected to the fixed part at a pivotal connection having a pivotal axis lower in height than the swiveling axis.

7. The construction machine of claim 1, further comprising: a drum casing attached to the machine frame; and wherein the upper part of the scraper blade is pivotally connected at the swiveling axis to the drum casing.

8. The construction machine of claim 1, wherein: the swiveling actuator is oriented substantially horizontally.

9. A construction machine, comprising: a machine frame; a milling drum mounted to rotate about a milling drum axis, the milling drum axis being fixed relative to the machine frame; a scraper blade located behind the milling drum with reference to a direction of travel of the construction machine, the scraper blade including an upper part and a lower part; a lifting actuator connected between the upper and lower parts to move the lower part relative to the upper part between a downward extended position and an upward retracted position; and a swiveling actuator separate from the lifting actuator, the swiveling actuator being connected between the upper part of the scraper blade and a fixed part fixed relative to the machine frame, the swiveling actuator being configured to pivot the scraper blade between an operating position and a raised position about a swiveling axis parallel to and spaced apart from the milling drum axis; wherein: the swiveling actuator is connected to the fixed part at a machine side pivotal connection; the swiveling actuator is connected to the scraper blade at a blade side pivotal connection, a pivotal axis of the blade side pivotal connection being lower in height than the swiveling axis; and the swiveling axis is offset rearward from the pivotal axis of the blade side pivotal connection when the scraper blade is in the operating position.

10. The construction machine of claim 9, wherein: the swiveling actuator comprises a piston-cylinder unit.

11. The construction machine of claim 10, wherein: the piston-cylinder unit is extended to pivot the scraper blade upward to the raised position.

12. The construction machine of claim 9, wherein: a pivotal axis of the machine side pivotal connection is located forward of the pivotal axis of the blade side pivotal connection.

13. The construction machine of claim 9, wherein: a pivotal axis of the machine side pivotal connection is lower in height than the swiveling axis.

14. The construction machine of claim 9, wherein: the swiveling axis is fixed in height relative to the machine frame.

15. The construction machine of claim 9, wherein: the swiveling actuator is oriented substantially horizontally.

16. The construction machine of claim 9, further comprising: a drum casing attached to the machine frame; and wherein the upper part of the scraper blade is pivotally mounted at the swiveling axis to the drum casing.

17. The construction machine of claim 9, further comprising: a drum casing attached to the machine frame; and wherein the machine side pivotal connection of the swiveling actuator is connected to the drum casing.

18. The construction machine of claim 9, wherein: in the operating position the scraper blade is oriented essentially orthogonally to a ground surface to be milled; and in the raised position the scraper blade is oriented essentially horizontally.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is an automotive road milling machine with a scraper device according to the invention.

(2) FIG. 2 is a first embodiment of a scraper device in operating condition.

(3) FIG. 3 is a scraper device according to FIG. 2 with the raised lower scraper part in unlocked position.

(4) FIG. 4 is a scraper device according to FIG. 2 in raised and swivelled position.

(5) FIG. 5 is a second embodiment of a scraper device in operating condition.

(6) FIG. 6 is a scraper device according to FIG. 5 with the raised lower scraper part in unlocked position.

(7) FIG. 7 is a scraper device according to FIG. 5 in raised and swivelled position.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(8) FIG. 1 shows an automotive road milling machine 1 in the design of a large milling machine, in which a milling drum 6 is mounted between front and rear travel drive units 2, 3 with a milling drum axis 5 in lateral walls 8 of the machine frame 4.

(9) The milling drum 6 is surrounded by a drum casing 7 attached to the machine frame 4, the said drum casing 7 being provided with, at the rear end when seen in the direction of travel, a scraper device with a two-part scraper blade 10. The lower part 12 of the scraper blade 10 can glide over the ground surface 9 milled off by the milling drum 6 during operation, with the lower part 12 of the scraper blade 10 being adjustable in height relative to the milling drum 6.

(10) It goes without saying that the scraper device with a two-part scraper blade 10 is also suitable for use in other road milling machines of different design.

(11) In addition to the side walls 8, a height-adjustable side plate 11 may additionally be provided as edge protection for the milling edge.

(12) FIG. 2 shows a first embodiment of a scraper device with a two-part scraper blade 10, in which the upper part 14 of the scraper blade 10 is attached, at the upper end 16, in an articulated fashion to swivel about a swivelling axis 18 parallel to the axis of the milling drum 5.

(13) In operating position, the scraper blade 10 is engaged with lateral retaining devices 20 in the lateral walls 8, which retain the scraper blade 10 in a position running essentially orthogonally to the ground surface 9. In the embodiment of FIG. 1, the lower part 12 of the scraper blade 10 is engaged with sliding blocks 24, which are mounted to rotate in the lateral walls 8 on both sides of the lower part 12 of the scraper blade 10.

(14) The lower part 12 is provided with one sliding surface 26 each on its vertical lateral edges 25, which are engaged with the sliding blocks 24 in a full-surface fashion.

(15) For this purpose, the sliding blocks are designed in cuboid shape, and in quadratic shape in particular in the cross-section, and are mounted to rotate in the lateral walls 8.

(16) When the lower part 12 of the scraper blade 10 is raised in relation to the upper part 14 by means of the lifting device 22, then the lower part 12, when in the highest position, is disengaged from the sliding blocks 24, so that the scraper blade 10 as a whole is released for swivelling.

(17) A swivelling device 30 can then swivel the scraper blade 10 about the swivelling axis 18, with the swivelling device 30 being articulated, at the upper end 16 of the upper part 14, with an operating device 34 comprising a piston-cylinder unit. The operating device 34 is articulated, on the machine side, at a permanently installed part 32, for example, at the drum casing 7, and extends essentially horizontally to an articulation 36 at the upper end 16 of the upper part 14 of the scraper blade 10, so that the scraper blade 10 can be swivelled upwards by at least 90 when a pressure force is applied by the operating device 34.

(18) As the lower part 12 of the scraper blade 10 is fully raised, the scraper blade 10 has only approximately half the height, so that the swivelling radius of the scraper blade 10 is reduced while a large swivelling angle is made possible at the same time.

(19) When the scraper blade 10 is swivelled back into the operating position, the lower part 12 can be moved downwards so that the lower part 12 can then thread in again in front of the sliding blocks 24 when seen in the direction of travel. Threading in is facilitated by the fact that the vertically running sliding surfaces 26 are bevelled or rounded at their lower edges 27 towards the scraper blade 10, and that the sliding blocks 24 are mounted in a rotating fashion. The sliding surfaces 26 may also run slightly conically, tapering in downward direction, in order to facilitate threading in as well.

(20) The rotatable sliding block 24 with a quadratic cross-section permits full-surface contact with the sliding surface 26, so that reduced wear and tear results from the full-surface contact.

(21) The sliding blocks 24 act as locking means when the scraper blade 10 is in the operating position.

(22) The operating device 34, at the upper part 14 of the scraper blade 10, preferably engages with the articulation 36 below the swivelling axis 18 of the scraper blade 10. It is understood that two operating devices 34 with two articulations 36, forming a second swivelling axis, may also be provided.

(23) The swivelling axis 18 is therefore arranged vertically higher relative to the articulation 36, and offset horizontally towards the rear relative to the direction of travel. In this way, the swivelling device 30 requires only a low design height where, due to the low point of application of the operating device 34, the entire swivelling device 30 does not project vertically in upward direction in relation to the upper part 14 of the scraper blade 10.

(24) The articulation 36 of the scraper blade 10 is preferably arranged in the plane of the upper part 14 of the scraper blade 10 or at a small distance from this plane.

(25) In the embodiments of FIGS. 5 to 7, the swivelling device 30 and the swivelling axis 18, as well as the lifting device 22 are arranged in essentially the same fashion as in the embodiments of FIGS. 2 to 4.

(26) The difference therefore essentially concerns the design of the retaining devices 20. These retaining devices consist of locking bolts 38 that are provided on both sides of the upper part 14 of the scraper blade 10, at the lower end of the upper part 14, with the said locking bolts 38 mounted in a movable fashion vertically in the upper part 14 of the scraper blade 10. The locking bolts 38 engage with corresponding bayonet-type recesses 40 in the lateral walls 8.

(27) Carriers 41 attached at the lower part 12 of the scraper blade 10 lift the locking bolts 38 when the lower part 12 of the scraper blade 10 is in its raised position. Lifting of the locking bolts 38 causes these to be lifted out of the locking part of the recess 40, so that the operating device 34 of the swivelling device 30 can swivel the scraper blade 10 about 90 or about more than 90 respectively.

(28) The carriers 41 at the lower part 12 of the scraper blade 10 consist of round bolts projecting orthogonally from the lower part 12 and running essentially horizontally. The locking bolts 38, which are supported in a guide of the upper part 14 of the scraper blade and are designed in a vertically movable fashion, are provided with recesses 44 open towards the bottom in their guiding plates 46 running parallel to the scraper blade 10, with carriers 41 being able to engage with the said recesses 44 in order to lift and to unlock the locking bolts 38.

(29) The locking bolts 38 are guided between vertical guiding walls 48, which project orthogonally from the upper part 14 of the scraper blade 10, in such a manner that the locking bolts 38 cannot get jammed.

(30) In addition, the upper part 14 of the scraper blade 10 can be provided with a flap 50 which can be opened in the operating position of the scraper blade 10 in order to be able to deposit a part of the excavated material in the milled track, if required.

(31) In both embodiments, the lifting device 22 engages, on the one hand, with the upper end 16 of the upper part 14 of the scraper blade 10 and, on the other hand, with the lower end 17 of the lower part 12 of the scraper blade 10.

(32) In both embodiments, the scraper blade 10 runs essentially orthogonally to the ground surface 9, i.e. vertically or slightly inclined by up to approx. 15 towards the milling drum, as can be seen from FIG. 1.

(33) Although a preferred embodiment of the invention has been specifically illustrated and described herein, it is to be understood that minor variations may be made in the apparatus without departing from the spirit and scope of the invention, as defined by the appended claims