Road milling machine

Abstract

In a road milling machine (1), comprising a machine frame (6), at least three travelling devices (2, 3), wherein at least two travelling devices (3) are drivable and at least one travelling device (2) is steerable, at least one milling drum (11) for working the ground pavement (4), at least one extraction device (12) for extracting air contaminated with dusts and vapours, it is provided for the following features to be achieved: the extraction device (12) comprises at least one first exhaust air pipe (13) with at least one first pipe section (24) with at least one first cross-section (26) and at least one second pipe section (20) with at least one second cross-section (22), wherein the second cross-section (22) is smaller than the first cross-section (26), wherein a suction channel (18) comprises an inlet opening (30) and an outlet opening, wherein the outlet opening (28) opens into the exhaust air pipe (13) in the area of the second pipe section (20), wherein the air contaminated with dusts and vapours can be sucked in at the inlet opening (30).

Claims

1. A road milling machine, comprising: a machine frame; at least three travelling devices, wherein at least two of the travelling devices are drivable and at least one of the travelling devices is steerable; at least one milling drum for working a ground pavement; and at least one extraction device configured to extract contaminated air, the extraction device including: at least one exhaust air pipe including at least one first pipe section and at least one second pipe section, the at least one first pipe section having at least one first cross-section, and the at least one second pipe section having at least one second cross-section, the second cross-section being smaller than the first cross-section; a fan connected to the first pipe section so that air can be blown into the exhaust air pipe by the fan, the second pipe section being downstream of the first pipe section such that the air flows first through the first pipe section and then through the second pipe section; and a suction channel including an inlet opening and an outlet opening, wherein the outlet opening opens into the second pipe section of the exhaust air pipe, so that contaminated air can be sucked in at the inlet opening.

2. The road milling machine of claim 1, wherein: the exhaust air pipe further includes a flexible hose arranged above the first and second pipe sections, the flexible hose being stretchable in length.

3. The road milling machine of claim 1, wherein: the first pipe section extends along a first longitudinal axis oriented at an angle to the ground pavement in a range from 70° to 90°.

4. The road milling machine of claim 3, wherein: the fan is configured such that air from the fan enters the air exhaust pipe at an angle in a range from 60° to 90° to the first longitudinal axis.

5. The road milling machine of claim 3, wherein: the suction channel enters the air exhaust pipe at an angle in a range from 60° to 90° to the first longitudinal axis.

6. The road milling machine of claim 1, wherein: the suction channel projects into the air exhaust pipe.

7. The road milling machine of claim 1, wherein: the air exhaust pipe includes a first opening and a second opening, the second opening being arranged above the first opening, and the contaminated air may exit the second opening.

8. The road milling machine of claim 7, wherein: the first opening of the exhaust air pipe faces the ground pavement.

9. The road milling machine of claim 8, wherein: the extraction device further includes a collection container arranged at the first opening of the exhaust air pipe.

10. The road milling machine of claim 1, wherein: the air exhaust pipe includes a first opening and a second opening, the second opening being arranged above the first opening, and the contaminated air may exit the second opening; further comprising: an operator's platform, wherein the second opening of the exhaust air pipe is arranged above the operator's platform.

11. The road milling machine of claim 1, wherein: the exhaust air pipe further includes a third pipe section arranged behind the second pipe section as seen in a direction of flow, wherein the third pipe section has a third cross-section larger than the second cross-section of the second pipe section.

12. The road milling machine of claim 1, further comprising: a milling drum casing arranged around the milling drum, the milling drum casing including a rear side as seen in a direction of travel, the rear side including an opening connected to the suction channel to form the inlet opening of the suction channel.

13. The road milling machine of claim 1, wherein: the at least three travelling devices includes at least two rear traveling devices, and the milling drum is arranged between the two rear travelling devices.

14. A road milling machine, comprising: a machine frame; at least three travelling devices, wherein at least two of the travelling devices are drivable and at least one of the travelling devices is steerable; at least one milling drum for working a ground pavement; and at least one extraction device configured to extract contaminated air, the extraction device including: at least one exhaust air pipe including at least one first pipe section and at least one second pipe section, the at least one first pipe section having at least one first cross-section, and the at least one second pipe section having at least one second cross-section, the second cross-section being smaller than the first cross-section; and a suction channel including an inlet opening and an outlet opening, wherein the outlet opening opens into the second pipe section of the exhaust air pipe, so that contaminated air can be sucked in at the inlet opening; wherein the first pipe section extends along a first longitudinal axis oriented at an angle to the ground pavement in a range from 70° to 90°; and wherein the extraction device further includes a fan connected to the first pipe section so that air can be blown into the exhaust air pipe by the fan, the fan being arranged below the suction channel and, relative to the first longitudinal axis of the exhaust air pipe, laterally next to the exhaust air pipe.

15. A road milling machine, comprising: a machine frame; at least three travelling devices, wherein at least two of the travelling devices are drivable and at least one of the travelling devices is steerable; at least one milling drum for working a ground pavement; and at least one extraction device configured to extract contaminated air, the extraction device including: at least one exhaust air pipe including at least one first pipe section and at least one second pipe section, the at least one first pipe section having at least one first cross-section, and the at least one second pipe section having at least one second cross-section, the second cross-section being smaller than the first cross-section; and a suction channel including an inlet opening and an outlet opening, wherein the outlet opening opens into the second pipe section of the exhaust air pipe, so that contaminated air can be sucked in at the inlet opening; wherein the extraction device is demountable from the road milling machine; and wherein the road milling machine further includes fasteners configured such that a transport conveyor may be connected to the road milling machine in lieu of the extraction device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following, one embodiment of the present invention is explained in more detail with reference to the drawings.

(2) The following is shown:

(3) FIG. 1 A road milling machine according to the present disclosure,

(4) FIG. 2 an extraction device,

(5) FIG. 3 the extraction device according to FIG. 2 in side view, and

(6) FIG. 4 the extraction device according to FIG. 3 in a sectional view.

(7) FIG. 1 shows a road milling machine 1 for working the ground pavement 4. The road milling machine 1 comprises a machine frame 6 and at least three travelling devices 2, 3. At least two travelling devices 3 are drivable and at least one travelling device 2 is steerable. The road milling machine may, however, also comprise four travelling devices, all of which may also be driven. In the embodiment depicted, the road milling machine is a small milling machine in which the milling drum 11 depicted merely by way of dashed lines is arranged between the rear travelling devices 3. The travelling devices 2, 3 may be wheels or tracked ground-engaging units. In the embodiment depicted, the travelling devices are wheels. The road milling machine comprises an operator's platform 8 and, above the operator's platform 8, a roof 62. The roof 62 may be height-adjustable in relation to the operator's platform.

(8) The rear travelling devices 3 may be height-adjustable in relation to the machine frame 6. In the embodiment depicted, lifting columns are provided for the rear travelling devices by means of which the machine frame 6 is adjustable in height. In this way, the milling drum 11 supported on the machine frame 6 may also be adjusted in height. One of the two rear travelling devices 3 may be pivoted, from an outer limit position depicted in FIG. 1, inwards into a recess 7 of the machine frame 6 so that the outer edge of the pivoted-in travelling device 3 ends approximately flush with the side of the road milling machine 1. In this way, on the side on which one of the rear travelling devices 3 is pivoted, the milling drum may be arranged in such a fashion that the same extends up to the side of the machine frame 6 and ends preferably flush with the side of the road milling machine 1, and milling close to the edge is thus possible. The side on which close-to-the-edge milling is possible is called zero side.

(9) The extraction device 12 is already depicted in FIG. 1. No transport device is provided in the embodiment shown. The milling drum 11 is arranged in a housing 10, in particular, a milling drum casing. An opening 15 is provided on the rear side 14 as seen in the direction of travel. The inlet opening 30 (FIG. 3) of the suction channel 18 (FIG. 3) is arranged behind the opening 15.

(10) The extraction device 12 is depicted in more detail in FIGS. 2, 3 and 4. The extraction device 12 comprises at least one exhaust air pipe 13. The first exhaust air pipe 13 comprises at least one first pipe section 24 and at least one second pipe section 20. The first pipe section 24 comprises at least one first cross-section 26, and the second pipe section 20 comprises at least one second cross-section 22. The second cross-section 22 is smaller than the first cross section 26. The suction channel 18 comprises an inlet opening 30 and an outlet opening 28. The outlet opening 28 opens into the second pipe section 20 of the extraction pipe 13.

(11) A fan 16 is arranged below the suction channel 18. Said fan 16 is preferably arranged laterally next to the exhaust air pipe 13. Below and above is to be used in the following so as to be understood in relation to the ground pavement. Above means further away from the ground pavement, and below means closer to the ground pavement. The exhaust air pipe shown comprises at least a first longitudinal axis 46 in the first pipe section 24, and a second longitudinal axis 47 in the second pipe section 20. The first and the second longitudinal axis 46, 47 extend essentially perpendicular to the ground pavement. The first and/or the second longitudinal axis 46, 47 preferably exhibit an angle α of between 70° and 90° to the ground pavement 4.

(12) The exhaust air pipe 13 may comprise a fourth pipe section 60 which is arranged above the first and second pipe section 24, 20, wherein the fourth pipe section 60 is designed as a flexible hose which is stretchable in its length. The flexible hose is designed in the form of a concertina and may therefore stretch in its length.

(13) This has the advantage that the exhaust air pipe 13 may be fastened to the height-adjustable roof 62 of the road milling machine 1, wherein the roof 62 is a roof of the operator's platform 8.

(14) As can be inferred from FIG. 4, the extraction channel 18 preferably projects into the exhaust air pipe 13 by the amount of X. In this way, the flow velocity in the exhaust air pipe in the area of the outlet opening 28 of the extraction channel 18 is particularly high, and the contaminated air can be carried off particularly well.

(15) The exhaust air pipe 13 may be of single-piece or multiple-piece design. In the present case, the exhaust air pipe 13 is composed of multiple pieces. The exhaust air pipe does also not have to extend rectilinearly. The exhaust air pipe comprises a first and a second opening, wherein the second opening 34 is arranged above the first opening 36. The first opening 36 is arranged on the side facing the ground pavement. The contaminated air may exit the second opening 34.

(16) A collection container 38 may be provided, as shown, on the first opening 36 of the exhaust air pipe 13. In the embodiment shown, the collection container 38 is open at the bottom. The same may, however, be easily closed with a lid. The collection container 38 may alternatively also be of a flexible material and be turned up at the lower end and be closed in this way.

(17) The exhaust air pipe 13 may also comprise a third pipe section 52 which comprises a third cross-section, wherein the third cross-section 50 is larger than the second cross-section 22 of the second pipe section 20. The cross-section of the exhaust air pipe thus increases again behind the entry of the contaminated air as seen in the direction of flow. This has a particularly positive effect on the extraction of the contaminated air.

(18) When dust develops in the milling drum casing, said dust may enter the extraction channel 18 through the opening 15 and the inlet opening 30. The fan 16 blows air into the exhaust air pipe 13. As a result of the air being blown into the first pipe section 24, and the second pipe section 20 exhibiting a smaller cross-section 22, the flow velocity is higher in the second pipe section 20. In this way, a negative pressure is created at the outlet opening 28 of the suction channel 18. The contaminated air is therefore sucked in by the suction channel 18.

(19) The air blown into the exhaust air pipe 13 by the fan 16 therefore carries the contaminated air with it and conducts the same to the second opening 34 where the contaminated air may exit. If more coarse-grained dirt is present in the contaminated air which cannot be carried along by the air, the same falls downwards through the exhaust pipe 13 into the collection container 38. Since the fan 16 is arranged next to the exhaust air pipe, that is, next to the exhaust air pipe and below the extraction channel 18 in relation to the longitudinal axis 46, even the coarse-grained dirt does not fall onto the fan 16. The contaminated air 18 does also not have to flow through the fan 16. The fan is therefore arranged on the clean side. In this way, the fan 16 has a longer lifespan and requires less frequent cleaning.

(20) The design of the extraction device enables the “Venturi effect” to be particularly well utilized, and the extraction process is particularly effective.

(21) In a road milling machine 1, comprising a machine frame 6, at least three travelling devices 2, 3, wherein at least two travelling devices 3 are drivable and at least one travelling device 2 is steerable, at least one milling drum 11 for working the ground pavement 4, at least one extraction device 12 for extracting air contaminated with dusts and vapours, it is provided for the following features to be achieved: the extraction device 12 comprises at least one first exhaust air pipe 13 with at least one first pipe section 24 with at least one first cross-section 26 and at least one second pipe section 20 with at least one second cross-section 22, wherein the second cross-section 22 is smaller than the first cross-section 26, wherein a suction channel 18 comprises an inlet opening 30 and an outlet opening, wherein the outlet opening 28 opens into the exhaust air pipe 13 in the area of the second pipe section 20, wherein the air contaminated with dusts and vapours can be sucked in at the inlet opening 30.