US1359563A - Process of removing sand cores from hollow drill-rod by sand-blast - Google Patents

Description

P. A. E. ARMSTRONG.

PROCESS OF REMOVING SAND comzs FROM HOLLOW DRILL ROD BY SAND BLAST.

Patented Nov. 23, 1920.

APPLICATION FILED DEC. 13, 1919- AME v UR no i ill) - eomparatively weal: original aliaelroi the .showmg'ilie operation of L .lFio

.llpplieaiioa filed heoember To all wizom may concern:

e ii'slriiown l, l saor El. E. ARM- STRONG, a subject of the liirig of Greal; Brilain, and a resident of LOHClOIlVlllS, county of Albany, State of ear Yorlr, have invents oereain new and iiseful improvements in Processes of Removing; Sahel Cores from Hollow Drill-Reel Sand-iflasrh, or" "which the following is a s eoiiicaoioia.

invention relaies to a process removing sancl cores from tubular hoclies, such as hollow clrill rocl, loy meansof a sand blast. The term sand eoi used herein eonvenierii expression lo cover sores of various refractory ma'ierials such hurried inagiiesihe powder lime. zirconia and the lilre.

in the man ioiure of tubular horlies such as hollow drill rocl lay hot hollow ingot with a sand core therein for elongation and reduction of e oss 'SfiCiZlUl-fi oi ingot and core as by e; 'lhe core iimihe resultins; elongated roci o ecluceel eross section is exizremely romp-ace difll uli; to remove.

lhieretoforaso as l are aware, sueh removal has been accomplished h drilling}; or by air lolasl. llrillihraoperations are troublesome, slow ancl'ezrpensive; While compressed air may he used for this purpose, the clifi'iciiliy with the use of the air hlast, not laden- With abrasive particles, resides in the air upon the resistant ('Olfi. Wheii the air or oiher gaseous fluid is laden with abrasive narlicles. making" what is known as a sand blast this clifii rally is avoioleai. the initial attack is highly powerful anol eil'ective, and the material of the core is rapidly hrolren (lown arirl removed.

The accompanying" drawings illustrate apparatus which may be used in carrying out my invention.

in the drawings Figure l is a transverse section of an apparatus in which the debris of the core is discharged through the abrasive laden air enters around 'lhe pipe and between it and ihe hore walls. Fig". 2 is an enlarged sectional diagrammaiical View the apparatus of 1., and Fig. 3 is a view similar. lo Fig. 2, sea showing ihe'ahrasive laden air eorichieieerhrougl'i the pipe and the discharge takingplace through the annular space between the outside of the pipe and the Walls of the hora.

Refereace numeral 10 oesignales the i; halar hocly suoh rlrill rocl, aiicl. the

sand cleacl at suitable ore a pipe ancisaiicl core which is to he removed from. the here 12. The hollow heacl 13 is supported in any suitable manner and ihetuloe 10 is removably olampecl means, such as the cam The pipe estends in'lzo head 13 through packing device as indicated at 16 in line with ihe here 12; and the pipe 15 is introduced into here 12 and advanced therein as the core maierial is removed. Various means may he for Sidvaiioirig she pipe 15.

Air unoler pressure is acli ihtecl iao 13 as lay pipe 1? prorirlecl with means such as valve 18 to prevent sand from iioiso ifhe air pip Two sources of higher pressure ihari the olher praise ably provided, as. for example, pipe 19, eeritrollecl val e 20 may carry eompresserl air ssiire for sand Work a icl pipe 21, also QDHEClZfiCi to piss ii. and cor.- irollecl by valve 2.2 may serve a0 supply roar pressed a higher pressure. lesle'ad or? air other suitable gaseous fluids he ill leans are erovieles for supplying; sire particles. as for example, saricl. to the ehamher 23 head 13. the form shown. a relatively tall anal narrow canister 2% is proriolecl communioaiiog with ehamher 23 by passage eonirollecl valve 25. The vanister is preferably macle tell to carry a suiiicienl; quantity of ahrasire. anrl narrow to avoiol undue pressure on the hearl 2", which is preferably bolted in plaee and provided with a plug 27 having a handle 28 for convenieiiee in filling with sam'l time "so time. The pressures are orefe 'ahl v halarieed on opposite sides o valve 25. as by ihe 'o -i ass pipe 29. controlled by valve 29'. A pine 30. controlled by valve 31 is preierah led in about (he top of canisier 24.. and serves when desired, to conne i, same to line sour-2e therein by suitable o shraused; separately when desired... as. for example, ii passage 24 or valve 25 shoizlrl gel". clogged up and require freeing; by arlmirizirig high pressure momentarily behind the semi. As such times pipe 17 is proiecrerl "from sorry of sand, ii the low pressure connection should he open. hy flap ralveil, and valve 29: may he eiose When the air la den with abrasive material 32 is eoriclarierl into'hihelll aroaiicl the one sicle oi pipe 15, as shown by the arrows in 1, is is confined so as to exerri its primary attack against the saml core in a more row annular region algaeeeh lo the here lllll 15, may

walls, as indicated at 33, Figs. 1 and 2. Due to the presence of the abrasive particles the initial attack on the sand core in this region is highly effective, and the core material being loosened in such annular region and freed from the bore walls is rapidly broken up and discharged through the bore 34 of pipe 15.

As the sand or other abrasive material 82 may be quite finely divided, no difficulty is encountered in delivering same through the narrow annular passage 35 between pipe 15 and the walls 36 of bore 12, and the pipe be of comparatively large diameter, leaving the bore 34 thereof sufiiciently large for discharge of particles of comparatively large size, which may result from the effective breaking up of core 11 by the sand blast.

In the alternative apparatus of Fig. 3, the sand blast enters through the bore 37 of pipe 38, is discharged centrally against the face of the core 11, as at 39, and the debris of the .core, together with the sand and air of the sand blast, are discharged through the annular passage about pipe 38.

The preferred mode of carrying out the invention, however, is as shown in Figs. 1 and 2, since the alternative mode of Fig. 3, while usable, requires a smaller pipe 38 in order to leave sufficient room for discharge of core particles of even moderate size, and

in the case of making hollow drill having a completed bore of only about i} of an inch diameter, it is desirable to be able to use a pipe of maximum size and ruggedness, also the walls of the drill rod bore are likely to bemore or less irregular and rough, which also interferes with free outward passage of comparatively large particles around the pipe 38. whereas with theform of Figs. 1 and 2 the particles have a free outward passage through the smooth bore 34 of relatively large diameter. Also the form of igs. 1 and 2 is better adapted for removal of hollow center cores,- which break down apidly when attacked by sand blast close up to the bore walls.

To carry out the process the rod containing the core to be removed is secured in lace and the air turned on, preferably the low pressure air. by means of valve 20, the

sand valve 25 being opened sufiiciently to admit the requisite amount of sand to cham- "or 23 and the removal of the core'is effect- -=l a has been described, the pipe being admasses vanced as needed to keep the sand blast up to its work on the receding faceof the core. If the sand passage 24 or valve 25 should be clogged, valve 31 can be opened and valve 29 closed for a short interval, which will usually be all that is necessary to free the sand passage. If the discharge from the tube 10 should become clogged it may be freed by admitting the high pressure air by valve 22, valve 20 being preferably closed at such times.

The discharge can be connected with a source of suction, if desired, though ordinarily this is unnecessary.

It is to be understoodthat the apparatus shown is only for illustration of apparatus by which the process may be carried into effect, and that the process can be carried out by other apparatus than as shown.

I claim:

1. The process of removing sand cores from tubular bodies which comprises the steps of introducing a pipe into the bore thereof, delivering air laden with abrasive material against the core through the annular passage between the pipe and the bore walls, and discharging the air and solid particles carried thereby backwardly through the pipe.

2. The process of removing from tubular bodies, such as hollow drill rod, sand cores made hard and compact by elongating and reducing the cross section thereof as by rolling with the sand core in place therein. which comprises the steps of delivering gaseous fluid laden with abrasive material against the sand core, and discharging the material of the core backwardly in the opposite direction from that of the fluid entry.

3., ,T he process of removing from tubular bodies. such as hollow drill rod, sand cores ma'de hard and compact by elongating and reducing the cross section thereof as by rolling with the sand core in place therein, which comprises the steps of delivering fluid laden with abrasive material against the sand core, discharging the abrasive material and the material of the sand core backwardly in the opposite direction from that of the fluid entry, and advancing the fluid discharge means progressively as the core is removed.

In testimony that I claim the'foregoing I hereto set my hand, this 10th day of December, 1919.

rnacr A. E. ARMSTRONG.

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