AU601284B2 - Button bit grinding system - Google Patents

Description

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(ORIGINAL)

FOR OFFICE USE Shorl Tito: Int. Cl: ArPllcrntn Numbeor- Lodged: CO"FP. a:O SPOciticaion-4odged: Accepted Pubflshed: Priority: FTisdocumC-11 Coft'nS tdo anenfl~f 1 ~made under Scction 49 and is correct for prillting.

4.- 040a4 *44 Nam; of 5 Xpplic',nt: Address of Applicnnt: Acftual Inventor: Addres.s (or Servkoe: TO BE COMPLETED BY APPLICANT 1. CON ST RUCTILON,-kI'IN'J'NG-E QUIPMEl~NTI AB3 Varvadersgataii 1, 417 311 GoteboDrCg,

SWEDEN

1KALLEVA KIEJO MANQUIST H3ALFORD AND M AXWELL, Patent Trade Mark Attornaeys, 49-51 York Street, SYDNEY, N.S.W.1 2000 Complete Specification (or v(.11i1(l rii~ea: "BUTTON BIT GRINDING SYSTEM"' S0000 01/ 0 6/88 T oawing statement 14 a full description of this Invention, including the beut method of podlorming It k~nown to rno::- U s 1.

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n -2- This invention relates to an apparatus for grinding button bits of the type used mainly in the drilling of underground mines, quarries, blast holes and water wells, etc. In the prior art the gridinig of button bits of mining and drilling equipment has been performed manually. This manual handling is time consuming and as it requires little skill is inefficient and wasteful, The present invention seeks to overcome these disadvantages or at least to provide San alternative by providing an apparatus for holding a grinding mechanism for grinding button drill bits.

In accordance with the invention the apparatus ause enable agrindig mechanism with its too to line 0* up inlu relation to the buttons of the drill bit to Sprecessional motion to grind said bit.

This invention will now be described with epet to Seabeig. I n shows the apparatus according to the inventi on in aside-view; and Fig. 2 shows a view through the drive mechanism of he grinding unit Fig. i shows drill bit clamping device 2 foe tol S; 'Fig 1 sho

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'111 olam"ping device 2 holds a drill IbiL 1. r111( cl.amping device 2 is supported along verticril axis 1U, b~y support 12. The support .12 bas nn adjusting hzandlie 13 whici allows the clamping device 2 to be moved along 11. The support 12 is held at thc ond of- arm 14 by bi.azcl~eL 15. IBraclzot 15 is, pivotablue about an oxi,, parallel. to axcis 11.

The other enmd of arm 14 is pivo~od on support colun 16 and is also mnovable along ais17 oE- thec column 16.

The space where the grinding operation is to be pnerf-ormedl is provided with a transparent shlield 4, 4 .444 99q40,f I~*4I ThIe grinding mechanism 3 and its drive mcchanisni 4 ate supported by a robotic arm system 5. The arm system includes two articulations joined ait one end to the coltumni 16 and at the other end to drive mnechani.Lsm 4. The arm system 5 is therefore rotatable about axis 17 and translatable in directions perpendicular to axis 17. Thi s arm system 5 is self -adjustable via the illustrated hydraulic or pneumatic cylinders 6 and 7, which adjust the grinding mechanism 3 into a proper location relative to the drill bit I and its tungsten carbide buttons which are to be sharpened or ground.

The grinding mechanism 3 is positioned at c~ angle to ir~ -4- ',hle axis 11 of drive shaft 9 by clamnp 21. The grinding mechanism 3 thus rotates in a conical pattern about axis 11. The grinding of all typos of buttons including conical and dome type tungsten carbide buttons can be S performed as well as the grinding without interference of narrow placed tungsten carbide buttons. The latter buttons are packed close to each other on the bit bcead leaving little spa-co between each othoer especially f~or those buttons, called gaugo buttos pJ.ace at lie 0puriphery of thec bit. The apparatus is suitable for t110 rogrinding of all types, of bit including convex, conlcave, drop centre and flat faced bits, as well nFs bitc, of, tLhC Lrunacd type Or in the holo hiammer. typo.

The ~~~~~grinding mechanism inldsahhspd oo 18,000 28,000 rpm) which drives Lhe grinding head to grind a button of the drill biL 1. The motor may be Powered by air., Or- hydraulically or electrically. The grindling mechanism 3 ca-n, for example, comprise a "Diaroc" or "Super Diaroc" tool of- the applican~t's manufacture or other s;uitable tool.

The robot arm systemi 5 also includes supply lines or hoses to distribute water for cooling, oil for lubrication, and compressed air for the operation oE the apparatus. These hoses have not been illustrated.

F~ig. 2 illustrates the drive mechanism 4. This includes a motor 8 which develops a low RPM drive for the grinding unit 3 via first and second belt pulley reduction gears. These geart comprise pulleyo 23 and 24 for the first gear and pulleys 25 and 26 for the second gear.

Pulleys 24 and 25 are drivan on the samne shaft 27 while pul.ley 2G drives shaft 9. The grinding unit 3 is thus made to rotate around shaft 9. Pl-'itings 22 providi2 for adr and water supply to the gjrindling unit. 3.

'Tho robot arm system according Lo the t enin 1 111Ochanisod sys-tm, thereb~y alimninating the nee2d e liandl-held operation.

'Though the invontion has' bDouon JefsCribect ab1ove withl tespecL to a preferred emnbodliment, it is to be understood as not limited theoreto. Other variations familiar to ai person ski~lled in the art are also contemplated. Fo r exaimple, the robotic arm can be made with other than the two articulations as shown. ]Equally the motor 3 can be connected directly to the drive shaft 9 via a planetary drive rather than via the belt pulley reduction gears 23, 24, 25 and 26. In addition, the bit holder and associated supports may include more than one drill bit to be grounid, whether in a single protective hiousing or shiield 20 ot: several separate housin.11

Claims (6)

1. An apparatus for grinding button bits including means for holding button bits in a position to be ground, a grinding mechanism equipped with a grinding tool which rotates about its longitudinal axis and further includes a grinding machine journalling devico ,which is positioned at an angle to the longitudinal axis of said grinding tool and which is operative to move the grinding machine in an orbital path with tho centre of rotation lying in the grinding centre of tho grinding tool, wherein the grinding machine journalling device is moveable in the horizontal and the vertical plane relative to the holding means, which is stationary.

2. An apparatus for grinding button bits as claimed in claim 1 wherein said journalling device is mounted on an articulated arm pivotally mounted on a vertical axis.

3. An apparatus for grinding button bits as claimed in claim 2 wherein said articulated arm comprises two I segments hinged by a joint, each segment including a pair of parallel arms.

4. An apparatus for grinding button bits as claimed in any one of the previous claims wherein said grinding mechanism further includes a high speed motor driving the grinding tool about said longitudinal axis and a low speed motor for rotating said tool at a set angle to said longitudinal axis.

An apparatus for grinding button bits as claimed in cl.aim 4 wherein said high speed motor is driven hydraulically, pneumatically or electrically and said t ,01". K- l l V^ I 1 11 Irl- -1-11 1 1 -7- low speed motor is driven from said high speed motor by reduction gearing.

6. An apparatus for grinding button bits substantially as hereinbeforo dcscribed with reference to the accompanying figures. Dated this day o~f 1990 4. a 4* j 4* a 4 a CME CONSTRUCTION-MT:NING-EQUIPI-,NT A13 By their Patent Attorneys Half ord Co. i~a L <44