US2757905A

US2757905A - Cleansing device for rotary rock drills

Info

Publication number: US2757905A
Application number: US304728A
Authority: US
Inventors: Paul C O'leary
Original assignee: Ingersoll Rand Co
Current assignee: Ingersoll Rand Co
Priority date: 1952-08-16
Filing date: 1952-08-16
Publication date: 1956-08-07
Anticipated expiration: 1973-08-07

Description

Aug. 7, 1956 P. c. O'LEARY CLEANING DEVICE FOR ROTARY ROCK DRILLS Filed Aug. 16, 1952 2 Sheets-Sheet l INVENTOR O 6 7 7 2 m Q A 2 5 3 A: i 5 f v I 9 3 III 9 7 3 1/ 4 2 J T4 FL |1|| L n L 4!\ J 6 6 PAUL C. O LEARY BY HIS ATTORNEY Aug. 7, 1956 p c;. O'LEARY 2,757,905

CLEANING DEVICE FOR ROTARY ROCK DRILLS Filed Aug. 16, 1952 2 Sheets-Sheet 2 INVENTOR PAUL C. 0' LEARY HIS ATTORNEY 2,757,905 Patented Aug. 7.,,. 1.95.6

United States Patent Oflice 2 Claims. (Cl: 255-49).

J2, assignorto Ingersoll- New York, N. K, a corporation of This invention. relates, to. rock. drilling mechanism, and. more particularly totai cleansing device, for pressure fluid actuated. rock, drills, of. the. rotary type.

Heretofore, in. the, use. of, devices of; the; type,-.to which the, present invention pertains. it. has, been. the, practice to utilize; the pressure. fluid thatdriyes thermistor. serving to rotate the drilling, implementonly, for; that. function nd o use a cons ant stream. t, pressure fluid directly: from the source of supply for blowing thecuttings, from the .hole being, drilled. Thisrnode of. operation, ll'lt addition to being wasteful of power. medium, is, also highly, o jectionable from the standpoint. of. the, noise: which res l s. when, the fluid is. exhausted directly. from he; o or. into. the. atmosphere.

It is accordingly an object; of the. present invention, ominiinize the power. costtor operating th trocle drill.

Ano her. object is to" obviate the objec ionable: noises. casioned by; the. exhaust. fluid discha gin irectly m he rock. drill. to the atmas her t.

Qther objectswill,beinpartcbyioustand in narttpointed ut, hereinafter.

In the. drawings; accompanying. this specification and in. which similar. reference numerals. refer. totsimilar. R s

Fig r 1 is. a sideelevation,.pa tly, broken, aways at a rotary rock drilliequippedwith acleansing.devicetccnrstructed in accordancetwithlthe prac ice oft he innenticm.

Figure. 2. is an, elevati n, partly. in section, of. the. drive ing element. offthe. rock drill,

Figure 3,. is. asimilar. view fa. detail, nd.

Figure 4; is a transverse. view taken hrough, Eigyre; 2 on the line 4-4 looking in the direction indicated by the arrows.

R f rring more particularly. tathe, drawings, 20 designates, in general; a' rotaryrock drill and 21 a drill rod WhiCh is rotated. by. therock drill? 20 The drill rod carries. a cutting bit 22. shown as-beihg; of the-insertdiamondf. type; andv extends into the forward end of the casing 23 where. it. is. supported and. guided by a pair 0ft relatively, spaced. antirfriction, bearings 24 and 2S:

Rotary motion. is imparted tothe. drill rod 21 by a pressllwfiuidi actuatedmotor 26ttheaoasing 27 of which is; seatedi upon a. surface 28,- attherearward end of the stem 41 that extends into and; is interlockinglyengaged with the crank, web;34 coaxially' with the, crank. shaft 30.

Withinthe valve 38ris a passage: 42 having a port 43. at its forward end: for; registry with. passages 44, in; the bushing 40. and. in, the.- casing: 27, leading to the outer ends of the: cylinders. 29.; The, pressure fluid; enters the passage 42 through a port; 45-, in the valve 38,, that. is in. constant. communication. with. an annular groove 4.6 in the. inner surface; of! the bushing 40; and into which pressure fluid flows. from. a supply conduit. 47 through apassage 48in the: valve chest and in the.- bushing 40;

In order to prevent the; motor speed: from risingto an excessively high. rate in. the; event that the cutting bit 22 enters a void or a pocket of soft material in, the roclc formation, the motorv 26 is: provided With: a suitable governor 49-for controlling; the rateof flowofpres sure fluid to the. valve.v 38.; The; governor 49. is interposed: in the supply conduit. 47 and its housing 5.0! is mounted uponxtherearwardlendz of the casing; 27. The. governor comprises. a spring opposed valve 51 whichis, reciprocable in; the. housing 50 for1 controlling communication between; branches. 52 and.- 535 of the supply, conduit 47 attached to, the housing 50; at points, lying in. spaced parallelplanes;

The valve 51 is actuated.- fon throttling; the flow oil: pressure. fluid from one branch conduit to anotherv bycentrifugallyactuated. weights 54 which; are; pivotally, mounted upon abracketSS in. the housing 50. and have arms 56 in.engagement. with the end of a stem; 57 on: the. valve. 5-1 for lifting; said valve. The. bracket 551s.

. carried. by.- a shaft! 58- that, extends through. the: casing asing Z3 and to which, it. may. be secured in any suitable; manner Thenmotor. 26. is. of the. rnulti-pistorrv type. Its;cy1inders,29t are. arranged in- V-fashiom about: a: crank shaft: 30, and. eachcylinder 29 contains: a: piston; 31;, the rod 32. of which-is connected to a common crank pin 33 having crank-webs 34 and 35. The crank shaft 30 extends forwardly through the casing 23, in parallelism with the drill rod 21, and carries a pinion 36 that meshes with a gear 37 which is carried by the drill rod 21 and located between the

bearings

24 and 25.

The distribution of pressure fluid to the cylinders 29 is controlled by a valve 38 arranged in a valve chest 39 mounted upon the rearward end of the motor casing 27. The valve 38 is rotatable within the chest 39, more particularly, within a bushing 40 in the chest, and has a 27 and carries a pinion 59 which meshes with a gear; 6,0; on.the. cranlc.shaft 30} In addition to: e-ficcting the: distribution; of pressure: fluid:- to. the Cylinders 29, the: valve 38 also. controls the. exhaust. of. fluid. from. the cylinders-.. It is,, accordingly; provided with a: passage 61 thatextends; endwise of; the; valve. and has. a port: 62. opening; into its periphery for. communication withthe-passagesa 44. The oppositercnda of. the: passage 61. opens; into, a: chamber 63 located in: the;valve*chest .39 at.the rearward: endof the; valve and: atconduit64-extendssfrom thechamber 6,3 totthe casing 23,. to which.- it is attached by" bolts, 65,; ion conveying thefluid exhausted. by theamotor' tor a chamhen 66s in: the casing 23 and which chamber is in constant come municaticnt with; a; passage- 67: extending; from end end. of the; drill? rod 21 Owing; to: this; arrangement all: of. the. fluid exhausted by the motor 26:- will, pass to;

the; working surface. for blowing, the Cuttings; from the;

surfa'.ce ,fr,e,eof. cuttings, but. when. drilling rock that is.

moist the. cuttings tend. to; adhere. to. thewall. of, the, drill:

hole, particularly adjacent the cutting, bit,. and may ac? cumul'ate in quantities thatwill clog thetdrillholes Totthe end" that occurrences of'thi's nature may be obviated,

the rock drill is provided with means for selectively directing an uninterrupted stream ofcleansing fluid, at full lihepressure; into thedrill hole' whenever required. A conduit 68% isaccordingly extended from the supply conduit 47 to the conduit 64 to by-pass the valve 38 and a valve mechanism, designated 69, controls the flow of pressure fluid thereinto from supply.

The valve mechanism 69 comprises a casing 70 which is secured to the rock drill casing 23 by bolts 71 and is interposed between the supply conduit 47 and the conduit 68. The casing 70 is recessed to provide a valve chamber 72 and

passages

73 and 74 that communicate with the supply conduit 47 and the conduit 68, respectively, and open into the valve chamber 72 at relatively spaced points along its length. Communication between the

passages

73 and 74 is controlled by a valve 75 having a pair of

heads

76 and 77 which are connected by a stem 78 around which pressure fluid flows from the passage 73 to the passage 74 in what may be termed the open position of the valve.

The valve 75 normally occupies a position in which the head 76 covers the passage 73. It is held in that position by a spring 79 interposed between the valve and a plug 80 forming a closure for one end of the valve chamber 72. The opposite end of the valve chamber 72 is also closed by a plug 81, and the end of the valve 75 adjacent thereto constitutes an actuating surface 82 which may be selectively subjected to pressure fluid conveyed to it by a conduit 83 connected to the plug 81 and having a manually operable valve 84 where by the flow of pressure fluid to the actuating surface and the exhaust of such fluid to the atmosphere may be controlled,

In the operation of the device, the valve 38 is rotated by the crank shaft 30 to bring the port 43 successively into registry with the passages 44 for charging the cylinders 29 and the port 62 is brought, in like manner, into communication with the passages 44 for effecting the exhaust of fluid from the cylinders into the chamber 63, whence it passes through the conduit 64, the chamber 66, and through the passage 67 in the drill rod into the drill hole for expelling the cuttings.

Whenever the exhaust fluid from the motor is found to be inadequate to keep the drill hole free of cuttings pressure fluid is valved, by manipulation of the valve 84, to the actuating surface 82 of the valve 75. The valve 75 will then be shifted to uncover the passage 73 and pressure fluid will flow, in an uninterrupted stream, from the passage 73 into the passage 74 through the conduits 6864 and associated passages into the drill hole.

The valve 84 may be manipulated to vary the pressure value of the fluid acting against the actuating surface 82 for shifting the valve 75 to either a partially or a full open position, depending upon whether it be desired to supply a heavy or a moderate flow of pressure fluid to the hole being drilled. By suitably restricting the pressure fluid through the valve 75 into the conduit 64 the back-pressure adjacent the valve 38 may be held to a sufficiently low value to preclude stalling of the motor and the motor may then continue to rotate the drill rod to assist in breaking up any compacted mass of cuttings that may have accumulated in the drill hole.

From the foregoing description it will be readily apparent to those familiar with the art that by utilizing the exhaust fluid of the motor instead of a constant jet of pressure fluid from supply, as a medium for cleansing the drill hole, the power cost of operating the drill will be greatly minimized. Moreover, the oil entrained in the pressure fluid and which is usually introduced thereinto for lubricating the parts to which the pressure fluid has access will also be carried into the drill hole instead of being disseminated in the atmosphere adjacent the drilling site, and the objectionable exhaust noises will be entirely eliminated.

I claim:

1. In a rock drilling mechanism adapted for rotary drilling only and operable by compressed gas, the combination of a rotary drill rod having a passage for con veying such fluid for cleansing therethrough, a'rotary type drill bit on the rod,-a compressed gas actuated rotation motor connected to drive the drill rod, a compressed gas supply line for the motor, a rotary valve for the motor for controlling the flow of compressed gas to and the exhaust of such gas from the motor, conduit means for conveying such exhaust gas from the rotary valve to the passage, a by-pass line for compressed gas leading from the gas supply line to the conduit means and bypassing the rotary valve, a pressure fluid actuated valve mechanism in the by-pass line to control the flow of such gas therein, said valve mechanism including a casing having inlet and outlet passages communicating with the gas supply line and the ,by-pass line, respectively, a reciprocable valve member having a cylindrical head sealingly slidable in said casing and interposed between said inlet and outlet passages for controlling the flow of compressed gas therebetween and having a second head at the opposite end thereof having an end face adapted to be exposed to pressure fluid to actuate the valve to its open position, a spring constantly urging the valve member to the shut-off position, a pressure fluid supply conduit to the casing adjacent said end face of the valve; and a manually operable valve in said line adapted to control the flow of such fluid to said end face of the valve.

2. In a rock drilling mechanism for rotary drilling only and operable by compressed gas, the combination of a rotary drill rod having a passage for conveying such fluid for cleansing therethrough, a rotary type drill bit on the rod, a compressed gas actuated rotation motor connected to drive the drill rod, a compressed gas supply line for the motor, a rotary valve for the motor for controlling the flow of compressed gas to and the exhaust of such gas from the motor, conduit means for conveying such exhaust gas from the rotary valve to the passage, a by-pass line for compressed gas leading from the gas supply line to the conduit means and bypassing the rotary valve, a pressure fluid actuated valve mechanism in the by-pass line to control the flow of gas therein consisting of a reciprocating spool type valve member having a pair of heads, a casing having ports associated by the by-pass line and controlled by one of the heads, a supply line to the casing adjacent an end face of the other said head for motive fluid to actuate the valve and, a manually operable valve in the last said supply line to control the flow of fluid therein.

References Cited in the file of this patent UNITED STATES PATENTS