Boring or penetrating the earth – With above-ground means to feed tool
Patent
1989-11-08
1992-03-03
Neuder, William P.
Boring or penetrating the earth
With above-ground means to feed tool
173105, 173114, 175189, 175203, E21B 302
Patent
active
050924117
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a drilling apparatus, in particular a drilling apparatus used for drilling shot holes, with a carriage for advancing and withdrawing the drilling rod that comprises a plurality of sections, an advance system, a pressure-operated drive system for the drilling rod, a flushing head that is arranged on the carriage, which can be moved either with or apart from the drilling rods, and a hydraulically operated in-hole hammer that is arranged on the front end of the drilling rod.
THE RELATED ART
Drilling apparatuses of this kind have been known for a considerable time, and are used in underground mining, tunnel building, and in the stone and earth quarrying industry. The advantage of the in-hole hammer system is that its blows are made directly on its chisels, so that there are not energy losses in the drilling rods, compared to the embodiment in which the hammers are arranged behind the drilling rods. In the case of hammers that are powered by means of compressed air, the working air also serves to remove the drilling debris from the hole. This is not possible in the case of hydraulically powered hammers, so that for these, three lines have to be provided in the drilling rods, i.e., one for the hydraulic feed to the hammer, one for the hydraulic return from the hammer, and one for the compressed air that is used to blow the drilling debris out of the hole. This embodiment entails the disadvantage that when the drilling rod is changed, the hydraulic system has to be shut down and that when the bore rods are separated and (re)connected, one has to accept losses of hydraulic oil and it will be impossible to avoid pollution.
Proceeding from this prior art, it is the task of the present invention to create a drilling apparatus of the type described in the introduction hereto, while avoiding the disadvantages set out above, which permits simple and rapid changing of the drilling rods when a hydraulically operated in-hole hammer that is arranged at the front end of the drilling rods is used.
SUMMARY OF THE INVENTION
According to the present invention, this has been achieved in that the compressed air operated drive for the drilling rods transmits a back and forth oscillatory movement to the drilling rods. Unlike former and conventional rotary drives, the system used herein provides for a back and forth oscillatory movement. This makes it possible to accommodate the required hoses in the annular space between the drilling rods and the walls of the drilled hole, with the result that these do not have to be parted when the rods are changed.
In order to achieve optimal drill performance and protection for the hoses that are used, the rotational range of the drilling rod is preferably restricted to an angle of pivot between 180.degree. and 360.degree..
It is advantageous that an oscillating motor with a gear system is used for the drive system.
The transfer of torque to the drilling rods is effected by an interlocking shape-fit preferably through profiling of the drilling rods, or by a force fit, preferably through a clamping system.
According to another feature of the present invention, the pressure-operated drive system is located on a slide that can be moved on the carriage of the drilling apparatus. The movement of the slide with the drive system can be effected by means of an advance chain, through the flushing head and/or by means of separate drives.
In order to preclude, for all practical purposes, wear on the hoses that are used, according to another feature of the invention it is proposed that the drilling rods have two longitudinal channels that are open to the outside, and which serve to accommodate the hoses used for the feed and return lines for the hydraulic oil for the in-hole hammer. The hydraulic hoses are located within the periphery of the drilling rods and do not project beyond these, so that to a very great extent these hoses are protected against wear. Flushing air is supplied through the hollow drilling rods.
The longitudinal channels in th
REFERENCES:
patent: 2151206 (1939-03-01), Hawthorn
patent: 2766011 (1956-10-01), Winder
patent: 3371726 (1968-03-01), Bouyoucos
patent: 3565190 (1971-02-01), Ishii
patent: 3786874 (1974-01-01), Jodet et al.
patent: 3844345 (1974-10-01), Evans et al.
patent: 4860837 (1989-08-01), Robert
Eckey Friedhelm
Hausherr Heinrich-Rudolf
Dubno Herbert
Neuder William P.
Rudolf Hausherr & Sohne GmbH & Co. KG
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