Mining or in situ disintegration of hard material – Hard material disintegrating machines – Percussive-type cutter
Patent
1987-03-03
1989-01-10
Novosad, Stephen J.
Mining or in situ disintegration of hard material
Hard material disintegrating machines
Percussive-type cutter
267 6415, E21C 2928
Patent
active
047969563
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to driving machines with a selective action boom implement, and, more specifically, it deals with machines for driving workings in hard rocks.
The invention may be most advantageously used in the mining industry, e.g. for driving workings in hard rocks by percussive rock breaking.
In addition, the invention may also be used in the mining and construction industries in machines having a percussive implement for crushing oversized rock lumps, demolishing foundations and walls of buildings, breaking road paving, for preparing rock bed for erecting dams and other water engineering structures, and the like.
BACKGROUND ART
Known in the art is a machine for driving workings in hard rocks referred to as a heading combine (cf. French Pat. No. 2,193,138, Int. Cl. E 21 C 35/06, publ. Feb. 15, 1974), comprising a base plate; a first carriage mounted on the base-plate; a trough-shaped carrier secured to the first carriage for rotation about the vertical axis; a boom extending in parallel with the longitudinal axis of the baseplate mounted for rotation on the trough-shaped carrier about the horizontal axis and about its own longitudinal axis; a platform mounted on the boom for rotation about a horizontal pivot pin mounted on, or adjacent to the outer end of the boom; a second carriage for installation of the implement, which is mounted for sliding with respect to the platform.
The first carriage is movable longitudinally along the baseplate by means of double-action hydraulic jacks.
The trough-shaped carrier is rotatable about the vertical axis with respect to the first carriage on which it is mounted by means of double-action hydraulic jacks.
The boom mounted on the trough-shaped carrier is rotatable about the horizontal axis up and down under the action of a pair of double-action hydraulic jacks. In addition, the boom is rotatable about its own longitudinal axis by a hydraulic drive.
The platform is mounted on the front end part of the boom for rotation with respect to the boom under the action of respective double-action hydraulic jacks.
The second carriage, which is mounted on the platform and designed for the installation of the implement, is movable by a double-action hydraulic jacks along the longitudinal axis of the platform.
All jacks are actuated by a hydraulic system including an oil tank, a pump having a drive, a system of pipelines, various control and safety valves. The hydraulic system is manually controlled from the operator's workplace on the trough-shaped carrier.
By moving the abovementioned members, the implement is brought up to, and pressed with its tool against the rock at a point where the rock is to be broken down. Then the hammer piston of the implement delivers a blow at the tool which transmits the impact energy to the rock thereby breaking it. After a rock lump is broken away, the implement is set to a new position, and the next blow is delivered.
The broken rock is removed by means of a scraper and winch.
The abovedescribed machine for driving workings in hard rocks is rather a sophisticated apparatus having a large number of hydraulic jacks and pivotal joints. The percussive implement used in the machine has to be positioned in such a manner that its longitudinal axis and the axis of the tool aligned therewith should be directed substantially at right angles to the surface of the rock body at a point where a blow is to be delivered. When a lump of rock falls down after the blow, the end of the tool acting upon the rock may slip over the surface of the rock body at an angle substantially different from the right angle. This slippage can be the cause of substantial dynamic loads acting upon all members of the machine which are only limited by the amount of yielding of these members so that they can fail.
The complicated structure of the machine and the abovedescribed phenomenon of slippage of the implement tool substantially lower reliability of the machine.
The need to set the implement every time at right angles to the rock body entails substantial
REFERENCES:
patent: 2159855 (1939-05-01), Laugaudin
patent: 2614833 (1952-10-01), Laugaudin
patent: 4300802 (1981-11-01), Mitin et al.
patent: 4379595 (1983-04-01), Roussin et al.
patent: 4593768 (1986-06-01), Eklof
Ermilov Nikolai P.
Fadeev Petr Y.
Fadeev Vladimir Y.
Korobko Vladlen V.
Kulagin Rim A.
Neuder William P.
Novosad Stephen J.
Spetsialnoe Konstruktorskoe Bjuro Gidroimpulsnoi Tekhniki
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