Patent Application
20090078468
This invention relates to a rock drill machine comprising a frame, arranged inside the frame a drill rod movable in axial direction, an arrangement to rotate the drill rod, a hammer gear, by means of which hammering pulses are generated to the piston, which is arranged to hammer the drill rod rear end, in order to transmit hammering pulses through the drill rod, attachable to the drilling equipment, for drilling the drill rod front end, and further, there is in this drilling machine arranged around the drill rod a position sleeve and an arrangement in order to move the position sleeve in axial direction towards the hammering pistons so that a counter surface in the position sleeve meets the a counter surface in the drill rod, whereby the drill rod can be moved to the d hammering point wanted, while continuing the said positioning motion.
Previously known from Finnish patent publication 114903 is a rock drill machine like the one presented, to w hose pulling gear that moves the drill rod during rock drilling a force in the opposite is directed, which moves the pulling gear forwards and keeps it at a specified distance from the position corresponding to the hammering point of the drill rod. When the drilling equipment is pulled out from the hole, the pulling gear is moved towards the hammering piston, causing transmission force in the pulling gear. Such special most usable percussion like working is needed in pulling the drilling equipment out of the drill hole, since often the drill tries to wedge into the hole while being removed from the hole.
The disadvantage of the solution according to publication FI-114903 is that for the pulling gear a moving arrangement in both directions is needed. When the movements are done by means of pressure medium the cylinder, piston and packing solutions become quite complicated. In addition, control valves are necessary for both positioning moves During pulling out the drilling equipment hammering pulses arise strongly into the drill frame, since there are no spring elements.
By means of a rock drilling machine according to the invention the need of many positioning movements and their controls are avoided. Only one moving direction has to be carried out, when the return movement in opposite direction takes freely place during operation of the drilling machine. During pulling out the drilling equipment there is due to the simple spring-arrangement a strong tendency to pull-off the impulses, whereby the drill is not strained by harmful hammering as much as in known solutions. Also the behaviour of the drilling by pulling out according to the solution of the invention departs essentially from known solutions, since energy bound to flexibility throws the drilling equipment backwards in regard to the frame in a quite other way, which is effective, among other things, in pulling out the drilling equipment from the hole, if it has already got stuck. It is easy to form one cylinder space in the drill frame as well as placing a piston furnished with one pressure surface in it.
In the following the invention is disclosed with reference to the enclosed drawing, where
The drilling machine has according to the invention a position sleeve 9 that positions the drill rod 2, which in this drilling situation is freely drifted to its foremost position, due to which it is so far from counter shoulder surface 12, which belongs to drill rod 2, that counter surface 12 does not reach to counter surface 13, which belongs to position sleeve 9, when drill rod 2 is making back and forth motion which belongs to the drilling situation. In the drilling situation shown by
By means of the new simple position sleeve 9 solution according to the invention hammering pulses are easily produced, which assist the pulling out of the drilling equipment from the hole.
On pulling out the drilling equipment, by means of piston 1, hammering pulses are produced, as even by hole drilling. By pulling out position sleeve 9 is moved towards hammering piston 1.
On pulling out, while the hammering piston is producing pulses to drill rod 2, the impact of the pulses can be turned to pulses, which pull out the drill equipment from the hole by means of a positioning sleeve 9 according to the invention, and by means of spring element 11, which stores and transmits energy. By pulling out, frame 3, 4 of the drilling machine is pulled by appropriate force off the hole. Frame 3, 4 represents a great mass and drill rod 2 and the drilling equipment a small mass and thus fast motion. Pulling out the drilling equipment from the hole improves essentially when, to drilling equipment a small back and forth motion can be conveyed in addition to even pulling force.
