US1875472A

US1875472A - Alexandeb gbant mcoeegor

Info

Publication number: US1875472A
Authority: US
Publication date: 1932-09-06
Anticipated expiration: 1949-09-06

Description

sept. 6, 1932. A, G, MCGREGOR 1,8755472 SAMPLING APPARATUS Filed April 2, 1928 I Patented Sept. s, 1932VA UNITED: STATES- ALEXANDER GRANT MCGREGOR, or LONDON; ENGLAND. Y

SAMPLING APPARATUS Application med April 2,kr

This invention relates to improvements in sampling apparatus for` dividing off 4from crushed ore or other pulverulent material or n w material capable of flowing under the influ- 5 ence of gravity a proportion of the total quantity which accurately represents the average constitution of the Whole body.

In the usual ore sampling plant, the Vore g is crushed andl sampled by automatic sami as plers, an example of which `is described in my United States Patent No. 1,591,092 dated July 6th, 1926. The final sample selected by such an apparatus, although onlyy a small portion of the original ore, is too large for laboratory tests or assays and is usually divided by hand manipulation such as coning and quartering, taking ever tenth shovel and like methods. Riltle splitters` are like- Wise used for this purpose consisting of a number of vert-ical partitions uniformly spaced, the spaces between the partitions being in communication with chutes and alternate chutes facing lin opposite directions so that one half` of the material is delivered to one side and the other to the other side of the splitter. Such an apparatusserves to divide the material into tWoport-ions of' which one can be used as a sample and by repeating the sub-divisiona small sample of a large bulk can be obtained. o

These methods require hand manipulation. The sample usually consists of amixture of ore particles ranging in size from one quarter of' an inch down to less than that Which Will pass a screen having 100 meshesto the linear inch. Since the coarser sizes of particles frequently contain a different proportion of valuable mineral from those contained in the finer sizes and in hand manipulation Vsome segregation from one another of coarse and fine particles may occur itis quite possible for the finer sample not to be a true average of the original material. Indeed, where shov'elling is resorted to in separating the sample the shoveller sometimes gains such skill in electin-g segregation of the particles that he can make a high or low sample at will.

It isl an object of' the present inventionV to l provide an automatic apparatus forl sub-dividing the material which vvill yield a fair vcordance With the invention.

1928. Serial No.. 266,715.

sample and avoid hand manipulation. The present invention comprises in apparatus for sampling crushed oreand similar material the combination of a plurality of riile-splitters in series and means fordirecting a sam- 313 pleidivided off by therst splitter to the second splitter and r thus againdividing it, and soon through any remaining splitters inv the series It is yto be understoodthat the term rime-splitters as rused herein is in- 60 tended to include anyapparatus comprising fixed upright partitions on to Which'the material to be sampled descends and which serve to-sub-divide it into a sample-portion and a reject-portion. Y

Preferably chutes are provided for collecting the sample-portion of the ore and redirecting it to the next rifile-splitter and these chutes may be formed as storage receptacles with means to permit periodic dis- 7o charge of their contents. The automatic discharge means may consist of a counter- Weighted hinged bottom to the storage receptacle.

The materialrejected by the rime-'splitters `75 preferably all passes intoJ a reject-collecting `chamber com-mon to all of them, chutes for delivering reject from eachV splitter Vbeing connected thereto. As` the reject-collecting chamber Will `necessarily, in handling dry v material, tend to become filled with fine floating dust-,the cih-utes are preferably provided with a counter-Weighted dust-seal thereby preventing, return of the dust up any of the chutes and obviating any liability ofthe sa'm'ple being altered by the admixture of such dust.

The accompanying drawing illustrates diagrammatically one form of apparatus in ac- In the drawing f- Figure 1y isy a vertical longitudinal section through the apparatus.

Figure 2 is a cross section on the line 2, 2 y ofA Figure 1 showing a portion only of the 95 apparatus, and

Figure 3 is a detail of a rilie-splitt-er. p The apparatus comprises a samplingchamber in theform of a vertically extending column 1l at the top of Which is a hopper 12 100 13 is rotated by suitable gearing from adriving motor which is also not shown and it serves to deliver a uniform eedof ma-VA terial to the apparatus below.

This apparatus comprises aseries ot riiiiesplitters-17, 18 19,120, 21, mounted one be- .low another inthe column 11.. Gne'of the Y Vmille-splitters is illustrated in Figure 3 and comprises a number of yvertical partitions 22 uniformly spacedvfrom one another. The spaces between the partitions `are connected to

chutes

23, 24 and alternate chutes :tace in opposite directions.. The chutes 23 all deliver toward the front of the rime-splitter and are open at the bottom. The chutes 24 form part et a storage receptacle 25 which extends along the rear portion of the splitter and is open at the bottom. vThe rilile-splitter is flanged round three sides, as shown at 26, 27, 28 and the flanges rest on brackets 29,4 30, (Figure 2) inside the column 11. To the underside of each storage receptacle 25 there is iitted a hinged door`31. The door is hinged by mounting it on an operating shaft 32 which passes through the walls of the column 11 andisconnected to a counterweight 33. The counterweight 33 is so Vdisposed that when the storage receptacle 25 is lled the weight of the material contained therein will cause the door 31 to open rapidly and fully. To this end the counterweight is mounted above the axis of the shaft 32 so that the leverage exerted by it falls off as the door k3l opens. When the storage receptacle 25 is completely emptied the counterweight rapidly closes the door 31. It will be noted that the rime-splitters are so mounted in relation to one another that when thedoors 31 open they serve to direct the material flowing by them on to the rililes o1c the splitters next below and to preventfloss of material by passing around the {lange 27 at the back of the splitter. Y j Y f The storage receptacle 25 of the lowermost rime-splitter 21 discharges into a removable sample-safe 34. rlhe samplelsafe 34 is provided with flanges similar to those of the rille-splitters and the column 11 has doors (not illustrated) which enable any one or more vof the splitters to be removed and the sample-safe 34 to be substituted at any point in the series. Y

The chutes y23 which carry the reject away from the splitters discharge through openings cut in the wallet the column 11 into hoods 35 said hoods forming the outer walls of said chutes, the bottom ends of which are closed by hinged doors 36 which serve as dust-seals and which are normally held closed by counterweights 36a. The hoods and hinged doors are surrounded by a reject-coL lecting column 37 which extends from the top to the bottom of the apparatus and receives all 'the reject material.

In operation the material uniformly de livered to the uppermost-'splitter 17 is divided by it into two equal portions, one of which passes out by the chutes 23 into the uppermost hood 35 and through the door 36 to the reject column 37. The other portion collects in the storage receptacle 25 which forms part of the chutes 24 until its weight is sufiicient to overcome the counterbalance weight 33,- where-upon it is discharged to the second ritlle splitter 18. As it is discharged in bulk there is no doubt that it will be accurately subdivided. TvVere the door 31 to be 'omitted so that the lrst riile-splitter delivered continuously to the second there might be some chance that thematerial in falling rapidly would rebound from some of the surfaces with which it came into contact and ifthedividing walls 22 of the splitter' 'were in any way irregular some selective action might take place which would interfere with the airnessof'the sample. As-soon as the storage receptacle 25 of the rifile-splitter 18 is filled, which will not talre place until the storage receptacle 25 of the iirst rifflev-splitter 17 has been emptied more than once, vthe discharge door 31 of the splitter 18 will open and deliver the material to thethird splitter 19. Here it is again subdivided and the action is repeated by the splitters 20 and 21 so that the material inally delivered to the safe` 34 consists of only V one-thirtysecond part of that initially delivered to the splitter 17. It it 4is desired to take a larger sampleany one of the splitters may be removed andthe sample-safe 34 inserted at any point in the series which may be desired. It is for this reason that the -rille-splitters are made removable and interchangeable with the sample-safe.

1. Apparatus j for sampling crushed `ore and similar material, consisting or" a series of rilile- Vsplitters mounted in ajseries one below another, chutes betweeneach adjacent pair of splittersv in the series for directing samplesgdivided oil .by the splitters above the chutes to the splitters below by gravity, said chutes being provided withy means to store sample material and automatic means to discharge material from such storage when a predetermined amount'thereof has accumulated.

2. Apparatus for sampling crushed ore and similar material, consisting of a series of Vrillie splitters mounted in a series one below another, means between each adjacent pair of splitters in the series for directing sam-k plesdivided olf by the splitter above said means to the splitter below, areject-collectingA chamber common to all of` said splitters, chutesv for delivering reject from each splitter thereto and a counterweighted dust seal below each said chute. A

3. Apparatus, for sampling ore and similar material, comprising a series of riliiesplitters mounted in a series onebelow another, means between each adjacent pair of splitters in the series for directingsamples divided off bythe splitter above said means to the splitter below, a reject-collecting chamber common to all of said splitters, f chutes for delivering reject from each splitter to said chamber, said chutes including hoods forming the outer walls thereof, and hinged counterweighted dust seals for automatically closing the lower ends of said chutes.

4. Apparatus Afor sampling crushed ore and similar material comprising, in combination, a sampling chamber in the form ofja vertical column, means, at the top of said column, for distributing material continuously and uniformly across the width thereof, a riflie-splitter below the said means, other riiliesplitters, in a series, below said firstnamed splitter, each of said splitters being provided with a sample chute and a reject chute, sample receptacles communicating with said sample chutes, counterweighted hinged doors for emptying said receptacles, when sufficiently filled, to the neXt riile-splitter below, a sample safe below the lowermost sample receptacle of the series, a rejectcollecting column into which said reject chutes discharge, said chutes including hoods forming the outer walls thereof, and hinged counter-weighted dust seals for automatically closing the lower ends of said reject chutes.

5. Apparatus for sampling crushed ore and similar material comprisingin combination a sampling chamber in the form of a vertically-extending column, means at the top of the columnfor distributing material continuously and uniformly across the width thereof, a riifle splitter below the said means and other riiiie splitters below the first said splitter in a series, each provided with a sample chute and a reject-chute, sample receptacles communicating with the sample chutes,

y counterweighted doors for discharging said receptacles automatically to the next .riftle splitter when sufficiently filled and a samplesafe below the last sample-receptacle of the series.

6. Apparatus for sampling crushed ore chutes to the splitters next below them in the series, and storage receptacles into which said chutes may deliver material, said reoeptacles having hinged counterweighted bottom doors to permit discharge of material ples divided ofl' by the splitters above the chutes to the splitters below, by gravity, said chutes being provided 'with means to store sample material, and automatic `means to discharge sample material, said means consisting of a counterweighted hinged bottom to the storage receptacle.

In testimony whereof I aiix my signature. ALEXANDER GRANT MGGREGOR.

and similar material comprising a plurality of rilile splitters mounted inaseries one below another and chutes between each adjacent pair of splitters in the series, for. directing samples divided oil by the splitters above the miV