Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1997-11-20
2000-01-04
Vo, Peter
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
173 38, 173 42, 173171, F16C 2902
Patent
active
060099577
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an arrangement in a feed beam of a rock drill, the arrangement comprising a feed beam which is provided with at least one slide guide frame on both sides of the feed beam and a slide guide profile of steel placed on each slide guide frame, whereby the inner surface of the slide guide profile and the outer surface of the slide guide frame of the feed beam are essentially in contact with each other.
BACKGROUND OF THE INVENTION
It is well known that the feed beam of the rock drill comprises slide guides along which the carriage of the rock drill slides when moving backwards and forwards along the feed beam. Similarly, in telescopic feed beams the parts of the feed beam move relative to one another along corresponding slide guides and the end beam may also move relative to the cradle at the end of the boom along corresponding slide guides. When the weight at the end of the boom is to be reduced, feed beams made of a light metal mixture have been used to reduce their weight. As a consequence of this, it is essential that separate steel slide guides or profiles providing the surface of the slide guide are secured to the feed beams because the wear resistance of light metal is clearly not sufficient in drilling conditions. An arrangement of this kind is known e.g. from Swedish Published Specification 444 346.
The above identified Swedish Published Specification discloses a solution in which the profile of an aluminum feed beam is shaped at the slide guide to be such that in addition to the surfaces of the slide guides at an angle relative to one another, it comprises surfaces narrowing away from the slide guides. The slide guide is made of a flexible steel profile which can be pushed to its place in the cross direction of the feed beam. In this case, the feed beam yields and is able to slide into its place and when it settles into its place, it presses against the surfaces of the feed beam and remains in place by its springback factor. A problem of this solution is that in order to implement cross directional mounting, the steel profile to be used has to be made of a very thin material. As a result of this, it easily works up during use because of damaging and for other reasons, whereby it bends and tends to straighten so that its springback factor weakens and it may fall off. Further, because of securing by the springback factor, the slide profile may slightly move relative to the beam and as a result, the dust between the profile and the feed beam may wear the end beam fast at the same time as the changes of form in the profile will be faster and thus the service life of the feed beam and slide profile will become shorter. Also, in situations in which the slide pieces or the carriage of the rock drill are clamped too tight against the slide guide, it may cause the slide guide to jolt and thus it will be permanently damaged at once.
SUMMARY OF THE INVENTION
The object of this invention is to provide an arrangement with which the problems mentioned above can be avoided and which is reliable and easy to implement. The arrangement according to the invention is characterized in that the other edge of the slide guide frame and respectively, the corresponding edge of the slide guide profile are shaped in such a manner that when the slide guide is in place on the slide guide frame, the edge of the slide guide profile is shape-locked relative to the edge of the slide guide frame; that the slide guide frame and the slide guide profile are shaped in such a manner that the slide guide can be placed in the cross direction of the feed beam against the slide guide frame without bending the slide guide profile in its cross direction; and that the arrangement comprises securing means with which the slide guide profile is secured to the feed beam stationary relative to it.
The essential idea of the invention is that the feed beam is provided with such a cross section of the profile part formed by the slide guide of the feed beam that the steel profile forming the slide guide can be
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Esko Mauri
Hakkinen Leo
Jantunen Heikki
Laitinen Timo
Calve James P.
Tamrock Oy
Vo Peter
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