Tool driving or impacting – Impacting devices – With means for rotating tool
Patent
1989-12-26
1991-11-12
Eley, Timothy V.
Tool driving or impacting
Impacting devices
With means for rotating tool
173105, 173104, 173 1, B23B 4516
Patent
active
050640038
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to equipment associated with operation of mines and quarries and, more particularly, to a hydraulic drilling machine.
2. Description of the Related Art
There is known a hydraulic drilling machine (cf., SU, A, 1,073,450) comprising a drill tool, a hydraulic motor for rotating the drill tool connected thereto through a reduction gear and having hydraulic pressure and discharge lines, and a hydraulic percussive mechanism having pressure and discharge lines communicating therewith via a rotatable fluid distributor, and a drive for rotating the fluid distributor. The hydraulic motor is used as a drive for rotating the fluid distributor in this hydraulic drilling machine. A separate hydraulic pressure line is used to feed the hydraulic motor rotating the fluid distributor.
In order to smoothly control the frequency and power of percussive action, use is made of a slide valve connected to the pressure lines of the hydraulic percussive mechanism and to the hydraulic motor rotating the drill tool.
The use of a hydraulic motor as the drive for rotating the fluid distributor necessitates extra consumption of liquid under pressure, and, accordingly, requires an additional pump.
As the slide valve is connected to the pressure lines the hydraulic motor rotating the drill tool and to hydraulic percussive mechanism, controlling the slide valve likewise necessitates more liquid under high pressure.
In addition, the above facilities fail to control the frequency and power of impacts delivered by the hammer of the percussive mechanism when reversing the hydraulic motor rotating the drill tool.
The aforedescribed overcomplicates the drilling machine in terms of its construction and control, as well as affects its reliability and reduces its operation efficiency.
SUMMARY OF THE INVENTION
The present invention aims at providing a hydraulic drilling machine in which a drill tool and percussive mechanism would be so hydraulically controlled as to ensure a higher efficiency of its hydraulic system, while simultaneously providing variations in the frequency of percussive action during changing of the rotation or stopping of rotational movement of the drill tool, as well as to improve the reliability of the machine.
The aim of the invention is attained by a hydraulic drilling machine comprising a drill tool, a hydraulic motor for rotating the drill tool connected to the drill tool through a reduction gear and having hydraulic pressure and discharge lines, and a hydraulic percussive mechanism having pressure and discharge lines connected to the arrangement through a rotatable fluid distributor, and a drive for rotating the fluid distributor. According the invention, the machine includes a flow governor made up of a non-return valve and a flow throttling valve connected in parallel, the inlet of the flow governor being connected to the discharge line of the hydraulic motor for rotating the drill tool through a fluid distributor provided in this line, and to the discharge line of the hydraulic motor through a flow restrictor, whereas the outlet of the flow governor is connected to the discharge line of the hydraulic percussive mechanism and to the inlet of the drive for rotating the fluid distributor having the form of a hydraulic turbine, a hydraulic accumulator being provided in the discharge line of the hydraulic percussive arrangement.
Preferably, the hydraulic turbine is a reaction turbine secured at the rotating element of the fluid distributor, the working chamber of the hydraulic turbine being preferably communicated with a discharge cavity of a rotatable fluid distributor via axial passages made in the fluid distributor, the discharge cavity of the rotatable fluid distributor continuously communicating with the hydraulic accumulator.
In view of the aforedisclosed, it is possible, because the hydraulic turbine uses a joint flow of the liquid spent in the hydraulic percussive arrangement and in the hydraulic motor rotating the drill tool,
REFERENCES:
patent: 3561542 (1971-02-01), Hanson et al.
patent: 3669197 (1972-06-01), Hanson
patent: 4261249 (1981-04-01), Grantmyre
Fanshtein Valentin N.
Medyanik Vladimir A.
Mushtakov Nikolai A.
Neroznikov Jury I.
Rudakov Ivan P.
Eley Timothy V.
Fridie Jr. Willmon
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