The present invention relates to an upper beam intended to be used with a lower beam in a telescopic feeder for a drilling machine for rock drilling. The present invention also relates to a telescopic feeder for a drilling machine and a drilling device for rock drilling.
In bolting in narrow drifts in mines, there is often a conflict between the desired advance per round for the blast hole drilling and the feeding length in bolt drilling. If the required length for the blasting was to be drilled, the feeder would be so long that it would not be possible for it to be arranged transversely in the drift. One way of solving this problem is to use a feeder with displaceable drilling supports or to use a telescopic feeder. A telescopic feeder has a lower beam and an upper beam which is slidably arranged on the lower beam. The length of the telescopic feeder may be changed so that it may be extended to the desired length in a drilling condition and retracted which results in that it may be accommodated transversely in the drift when needed. One problem with telescopic feeders is that they are heavy and ungainly.
An example of a telescopic feeder is disclosed in WO9518912. This telescopic feeder comprises a lower beam and an upper beam slidably mounted on the lower beam. The slide rail, intended for the sliding arrangement between the upper beam and the lower beam, is placed solely on the lower portion of the upper beam which makes the lower beam low. This results in a reduced height of the telescopic feeder. The disadvantage of this design is that the upper beam becomes heavy and ungainly. This is in particular a problem when the feeder is used in a position where it has been rotated somewhat around its axis. The leverage with a heavier upper beam and lighter lower beam will then result in impaired friction between the beams.
It is therefore an object of the present invention to provide a drilling device which is compact and has good sliding properties.
According to the present invention, this object is achieved by an upper beam intended to be used with a lower beam in a telescopic feeder for a drilling machine for rock drilling. The upper beam extends along a longitudinal axis and has a generally U-shaped cross section comprising a bottom wall and a first and a second side wall, wherein each side wall has an inward surface and an outward surface. The upper beam comprises a cooperating member intended for slidable cooperation with the lower beam. The cooperating member comprises an attachment means extending outwardly from each outward surface of each side wall. Each attachment means is intended for fixed mounting of a crank block bracket, which crank block bracket faces said outward surface of each side wall.
According to the present invention, this object is also achieved by a telescopic feeder for a drilling machine for rock drilling. The telescopic feeder comprises a generally U-shaped lower beam and the upper beam according to the present invention.
According to the present invention, this object is also achieved by a drilling device for rock drilling, comprising a drilling machine and a telescopic feeder according to the present invention.
Since the upper beam comprises crank block brackets facing the side wall of the upper beam, a space is created between the crank block bracket and the side walls of the upper beam, which space enables the upper beam to travel partly in the lower beam, which makes the telescopic feeder compact. Since the crank block brackets, having a much lower weight than the slide rail, are arranged at the upper beam, the weight of the upper beam is kept low which means a reduced leverage and thus improved sliding properties.
An advantage of the present invention is that it provides for an improved view for the person performing the drilling since the telescopic feeder is not very high, i.e. the telescopic feeder is more compact.
A further advantage of the present invention is that the lower beam, which is subjected to large forces, is strong and robust. This is since slide rails for sliding cooperation with the upper beam are arranged along the lower beam which makes it more heavy and stable.
A number of embodiments of the invention will now be described with reference to the drawings. The present invention is not limited to these embodiments. Various variants, equivalents and modifications may be used. Therefore, the embodiments should not be considered as limitations of the scope of the invention, which scope is defined by the appended claims.
The upper beam 40 comprises cooperating members 110 intended for slidable cooperation with the lower beam 50 so that the upper beam 40 is telescopically displaceably arranged in the lower beam 50. The upper beam 40 moves along the longitudinal axis of the lower beam 50 in a conventional manner, e.g. utilizing a telescopic cylinder which may for example be fixedly mounted to the upper beam 40 and the lower beam 50, in a space between the upper beam 40 and the lower beam 50.
The upper beam 40 may comprise two or more cooperating means 110, arranged at the upper beam 40, advantageously on each of the outer surfaces 110 of the side walls 70, 80, alternatively on the bottom wall 60. The cooperating members 110 each comprise an attachment means 120 and a crank block bracket 130. The attachment means 120 is fixedly mounted on the upper beam 40 and fixedly mounted on the crank block bracket 130. The attachment means is arranged at the outward surface 100 of the upper beam 40, e.g. by means of welding, and is arranged so as to extend outwardly from the outer surface 100 of the side walls 70, 80. In order to enable the upper beam 40 to travel in the lower beam 50, and in order for the attachment means 120 to not be in the way for the lower beam 50, the attachment means 120 is vertically arranged at a portion of the side wall intended to protrude above the upper beam 50, i.e. is arranged at the upper portion 104 of the upper beam 40. This means that the attachment means 120 is arranged at a distance from the bottom wall 60 so that the lower portion 102 of the upper beam is free from protruding parts and enable the lower portion 102 to travel in the lower beam 50. In an alternative embodiment, the attachment means 120 is arranged on the bottom wall 60, in order for it not to be in the way for the lower beam 50 the attachment means 120 is arranged so as to run tightly along the bottom wall 60 and side walls 70, 80 of the upper beam 40 up to the upper portion 104, where it deflects outwardly from the outward surface 100 of the side walls 70, 80 as mentioned above.
The higher on the upper beam 40 the attachment means 120 extends outwards from the outward surface 100 of the side walls 70, 80, the larger the portion of the upper beam 40 that is enabled to travel in the lower beam 50. The attachment means 120 may be manufactured by extrusion or in another suitable manner and may be constituted by e.g. aluminium or other suitable material. The upper beam 40 has a front end 140 and a rear end 150 (see
In
The upper beam 40 also comprises a pair of sliding rails 180 intended for sliding cooperation with a carriage 190 on which carriage 190 the drilling machine 20 is arranged (the carriage is also illustrated in
In order to reduce the height of the telescopic feeder 30, the lower beam 50 is wider than the total or at least the lower portion 102 of the upper beam 40 so that the lower beam 50 within its U-shape accommodates all of the lower portion 102 of the upper beam 40 in such a manner that the upper beam 40 fully or partially may travel in the lower beam 50. As mentioned above, it is a matter of fact that the larger the vertical portion of the upper beam 40 traveling in the lower beam 50, the more compact the telescopic feeder 30 can be made, i.e. the less is the height of the telescopic feeder. The lower beam 50 is manufactured of a suitable material such as e.g. an extruded aluminium profile. The lower beam 50 comprises a pair of slide rails 160 as mentioned above, intended for sliding cooperation with the above mentioned crank block bracket 130 arranged on the upper beam 40. The sliding rails 160 may for instance be cladded with an outer layer 260 having suitable abrasion and sliding properties such a thin steel sheet. The sliding rails 160 may be fixedly arranged along the lower beam 50 or constitute a part of its extruded cross section. Suitably, the slide rails 160 are arranged with one sliding rail on the outward surface 250 of each side wall 230. The slide rails 160 have a suitable male profile for cooperation with the female profile of the crank block bracket 130 on the upper beam 40. In the example in
Number | Date | Country | Kind |
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0600293 | Feb 2006 | SE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/SE2007/000049 | 1/19/2007 | WO | 00 | 6/20/2008 |
Publishing Document | Publishing Date | Country | Kind |
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WO2007/091939 | 8/16/2007 | WO | A |
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Number | Date | Country |
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9518912 | Jul 1995 | WO |
2004074626 | Sep 2004 | WO |
Number | Date | Country | |
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20100218998 A1 | Sep 2010 | US |