AU744239B2

AU744239B2 - Device for cutting or kirving material

Info

Publication number: AU744239B2
Application number: AU11352/99A
Authority: AU
Inventors: Otto Krassnitzer
Original assignee: Voest Alpine Bergtechnik GmbH
Current assignee: Sandvik Mining and Construction GmbH
Priority date: 1997-11-04
Filing date: 1998-11-03
Publication date: 2002-02-21
Anticipated expiration: 2018-11-03
Also published as: ATA186597A; PL340382A1; WO1999023356A1; DE59804836D1; AU1135299A; AT407421B; EP1029150B1; ZA9810055B; PL189331B1; ATE220760T1; EP1029150A1

Abstract

The invention relates to a device for cutting or kirving material on an essentially flat working face. Said device has a kirving tool which is mounted on a swivelling boom in such a way that it can rotate. Said boom consists of at least two boom parts (6, 7) which pivot in relation to each other. The swivelling axis of the boom and the swivelling axes (8, 9) of the boom parts (6, 7) pass through the breast. Planetary gears are arranged coaxially to the swivelling axes (8, 9) of the boom or boom parts (6, 7) and decrease the rotational speed of the turning drives for the swivelling drive to a reduced swivelling speed of the boom or the boom parts (6, 7).

Description

1 Device for Cutting or Kirving Material The invention relates to a device for cutting or kirving material on a substantially plane working face by means of a cutting tool which is rotatably mounted on a pivotable cantilever arm comprised of at least two relatively pivotable cantilever arm parts, the pivot axis of the cantilever arm and the pivot axes of the cantilever arm parts passing through the mine face.

A device of the initially mentioned type is known from AT 380 925 B. The known device aimed to provide a cutting machine which could do with a very short structure, viewed in the advance direction, while simultaneously enabling the walling of the track as far as close to the mine face without interruption of the cutting work and without endangerment or impediment. Therein, the pivotable cantilever arm parts are pivotable about axes which are oriented substantially normal to the mine face such that for the lower cantilever arm part a pivot angle of at least 1800 and for the cantilever arm parts mounted on said first pivotable cantilever arm part an accordingly larger pivot angle is required in order to be able to work an actually plane mine face in an accordingly pivoted position. In doing so, high demands are set on the pivoting actuator, since that pivoting actuator naturally also must take up reaction forces during cutting. On account of the required pivot angle and, in particular, the pivot angle required for further cantilever arm parts articulately connected to the first pivotable cantilever arm part, conventional cylinder piston units are to be excluded as actuators. However, a rotary drive, which in a conventional manner might be designed as a hydraulic motor in cutting machines, calls for a reduction gear providing a high gear reduction in order to ensure precise positioning and the safe absorption of the cutting forces. The reduction gear to be employed, moreover, must be housed in a protected manner, and it is the object of the invention to provide a device of the 2 initially mentioned type, whose reduction gear does not enlarge the structural length, viewed in the advance direction, and can be housed in a very small space.

Furthermore, the invention aims to design such a reduction gear in a manner that, in addition to a short mode of construction, also a high gear reduction and the safe arrangement in the respective cutting arm or cantilever arm parts are feasible. To solve this object, the device according to the invention essentially consists in that planetary gears are arranged coaxial with the pivot axes of the cantilever arms or cantilever arm parts, which planetary gears lower the speed of rotary drives for the pivoting actuator to a reduced pivoting speed of the cantilever arm or cantilever arm parts.

By arranging planetary gears coaxial with the pivot axes of the cantilever arms or cantilever arm parts, such gears, viewed in the axial direction of the pivot axis, can be designed in an extremely short-structured manner and housed in the cutting arm or cantilever arm part in a protected manner.

Advantageously, the configuration according to the invention in this case is devised such that the gears in the region of the pivot axes are designed in a structurally identical manner and each comprise a driven sun wheel, a plurality of rotating planet wheels journaled on a carrier as well as a two-part ring gear which is divided in the axial direction, wherein the ring gear parts are fixed in different parts of the cantilever arm in a rotationally fast manner. Such a two-part ring gear which is divided in the axial direction ensures a particularly high gear reduction at an extremely small structural length, viewed in the axial direction. Due to the fact that one of the two ring gear parts is fixed in the first cantilever arm part in a rotationally fast manner, the planet wheels in the event of a driven sun wheel are forced to rotate together with their carrier. And the fact that the second part of the divided twopart ring gear is connected in a rotationally fast manner with the cantilever arm part that is pivotably mounted on the preceding part offers an effective and extremely high gear reduction if the planet wheels are dividedly designed, 3 comprising relatively slightly deviating numbers of teeth in the two sections. In principle, however, also a uniform planet wheel extending over the entire axial length may be employed if, in order to achieve an accordingly high gear reduction, the configuration is devised such that the ring gear parts carry different numbers of teeth.

In that case, the configuration advantageously is devised such that the planet wheels rotate in the axially adjacent ring gear parts on different reference diameters. Such a mode of construction renders feasible the utilization of what is called a profile correction, wherein the planet wheels may be designed in one part. In order to obtain a differential tooth number of, for instance, three, an inward profile correction takes place in the stationary ring gear part of one of the cantilever arms and an outward profile corrections takes place in the output ring gear part, which is connected in a rotationally fast manner with the cantilever arm part that is pivotably mounted on the preceding cantilever arm part. In this case, the planet wheel engages in both ring gear parts on different reference diameters. The reference diameter in each case results from the multiplication of the module and the number of teeth.

Advantageously, the configuration according to the invention, thus, is devised such that the numbers of teeth of neighboring ring gear parts differ from each other by at least one, preferably three to four, which results in a particularly high gear reduction and, at the same time, calls for the smallest structural length in the axial direction.

In a particularly simple manner, the rotary drives according to the invention may be comprised of hydraulic motors. Also the actuator for the cutting head or the cutting rolls, which is arranged on the respectively outermost cantilever arm part, in an advantageous manner may be designed as a hydraulic motor, wherein a protected arrangement of the hydraulic ducts 4 to the respective hydraulic motors is rendered feasible in a particularly advantageous manner in that the sun wheels are arranged on hollow shafts for the passage of hydraulic ducts to hydraulic motors arranged on the consecutively provided pivotable cantilever arm part.

A particularly small space demand for the cantilever arm results in that the output ring gear of the first gear stage and the firmly connected ring gear part of the planetary gear of the outer boom are arranged in the same vertical plane.

In the following, the invention will be explained in more detail by way of an exemplary embodiment schematically illustrated in the drawing. In the drawing, Fig. 1 is a schematic side view of a cutting machine according to the invention, Fig. 2 illustrates a section through the gears in the cutting or cantilever arm parts, and Fig. 3 is a partially sectioned view in the direction of the arrow III of Fig. 1.

Fig. 1 depicts a cutting machine 1 whose stationary machine frame is denoted by 2.

A slide which is L-shaped in side view is displaceable relative to the box-shaped machine frame 2 and has an upwardly extending end region which is designed as a portal and denoted by 3. The slide via lugs 4 overlaps a guide tube 5, which in turn is connected with the rigid machine frame 2. The slide and, in particular, the portal-like end 3 of the slide, on which the cantilever arms 6 and 7 are mounted so as to be rotatable about pivot axes 8 and 9, in the main may be displaced towards the mine face relative to the machine frame 2 in the direction of the double arrow 10 without requiring the machine itself to be displaced by its crawler mechanism 11.

A roof bolt drilling and setting device is schematically indicated by 12. In order. to keep as low as possible the 5 distance between the positions in which the roof bolt drilling and setting device 12 enters into action and the mine face, only little space remains available for the cantilever arm parts 6, 7, their respective drives, a kirving motor 13 and a cutting head 14, wherein the structural dimensions in the axial direction can be appropriately reduced only by constructing the actuating means and the gear for the cantilever arm parts 6 and 7 accordingly. The details of this actuating means are represented in Fig. 2.

From Fig. 2, it is apparent that a first cantilever arm part 6 is arranged on the portal 3 so as to be pivotable about an axis 8. A hydraulic motor 15, which is connected with a sun wheel 17 via a gear train 16, is provided for actuation. The gear train 16 may, for instance, be designed as a chain drive.

The sun wheel 17, which is, thus, in connection with the driving motor 15, meshes with planet wheels 18 which rotate together with their carrier. The ring gear, in which the planet wheels 18 engage, is dividedly designed with a first ring gear part 19 being stationarily connected with the portal 3, whereby the planet wheels 18 are driven for rotation about the axis 8. The output drive is effected via the second ring gear part 20, which again is stationarily connected with the first, pivotable cantilever arm part 6. The numbers of teeth in the ring gear parts 19 and 20 differ from each other such that in the event of a uniformly configured planet wheel 18 suitable speed reduction will be effected with a high transmission ratio being adjusted.

The actuating means for the second cantilever arm part 7 is designed in an analogous manner. The hydraulic motor in this case is denoted by 21 and drives a central sun wheel 22. From the illustration of this sun wheel 22 it is apparent that this sun wheel is hollowly designed, comprising an axial bore 23 for the passage of hydraulic ducts which may be arranged in the interior of the cantilever arm parts 6 and 7 in a 6 completely protected manner, leading also to the kirving actuator for the kirving head 14. A rotary passage for the supply ducts is denoted by 29.

Planet wheels 24 again mesh with the sun wheel 22, the externally arranged ring gear again being designed in two parts. The ring gear part 25 again is connected with the cantilever arm part 6 in a rotationally fast manner, whereas the second part of the ring gear 26 is connected with the cantilever arm part 7 in a rotationally fast manner. Due to the difference in the numbers of teeth provided in the ring gear parts 25 and 26, it is again feasible to provide a high gear reduction, wherein accordingly small-structured hydraulic motors 21 and 15, respectively, will be sufficient while, nevertheless, enabling the safe absorption of the required supporting forces and reaction forces.

In the illustration according to Fig. 3, the planet wheels and the respective ring gears are visible in partial section. The planet wheels are each journaled on common carriers and are able to rotate in the sense of the double arrow 27 as a function of the number of teeth of the respective ring gear part. As for the rest, the reference numerals of the preceding Figures have been retained in the illustration according to Fig. 3. In addition to the end-side portal 3, the frame members 28 of the slide structure are visible, which is guided on the tubes 5 so as to be displaceable in the longitudinal direction of the machine. Furthermore, the box section of the rigid machine frame 2 is clearly apparent as is the fact that the stationary machine frame 2 has the shape of a box section and accommodates a track conveyor 30, which is mounted in the box-shaped section so as to be displaceable in the longitudinal direction of the machine.

6a Where the terms "comprise", "comprises", "comprised" or "comprising" are used in this specification, they are to be interpreted as specifying the presence of the stated features, integers, steps or components referred to, but not to preclude the presence or addition of one or more other feature, integer, step, component or group thereof.

0 a as 00 00 26/04/00,td 11276. com. doc,6

Claims

1. A device for cutting or kirving material on a substantially plane working face by means of a cutting tool which is rotatably mounted on a pivotable cantilever arm comprised of at least two relatively pivotable cantilever arm parts 7), the pivot axis of the cantilever arm and the pivot axes 9) of the cantilever arm parts 7) passing through the mine face, characterized in that planetary gears are arranged coaxial with the pivot axes 9) of the cantilever arms or cantilever arm parts which planetary gears lower the speed of rotary drives for the pivoting actuator to a reduced pivoting speed of the cantilever arm or cantilever arm parts 7).

2. A device according to claim 1, characterized in that the gears in the region of the pivot axes 9) are designed in a structurally identical manner and each comprise a driven sun wheel (17, 22), a plurality of rotating planet wheels (18, 24) journaled on a carrier as well as a two-part ring gear which is divided in the axial direction, wherein the ring gear parts (18, 19; 25, 26) are fixed in different parts 7) of the cantilever arm in a rotationally fast manner.

3. A device according to claim 1 or 2, characterized in that the ring gear parts (18, 19; 25, 26) carry different numbers of teeth.

4. A device according to claim 1, 2 or 3, characterized in that the planet wheels (18, 24) rotate in the axially adjacent ring gear parts (18, 19; 25, 26) on different reference diameters.

A device according to any one of claims 1 to 4, characterized in that the numbers of teeth of neighboring ring gear parts (18, 19; 25, 26) differ from each other by at least one, preferably three to four. 8

6. A device according to any one of claims 1 to characterized in that the rotary drives are comprised of hydraulic motors (15, 21)

7. A device according to any one of claims 1 to 6, characterized in that the sun wheels (17, 22) are arranged on hollow shafts for the passage (29) of hydraulic ducts to hydraulic motors (15, 22) arranged on the consecutively provided pivotable cantilever arm part 7).

8. A device according to any one of claims 1 to 7, characterized in that the output ring gear (20) of the first gear stage and the firmly connected ring gear part (25) of the planetary gear of the outer boom are arranged in the same vertical plane.