Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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I
ROCK PULVERIZING SYSTEM
BACKGROUND OF Tl~E IN~E:NTION
1. FIELD OF TEIE IN V~N llON
This invention relates to the rock crushersl~ and more -r ~ 1
5 to the c~..tl ;rb~j,d~ . g machines class. The invention relates also to
i~L I 1 ~ machineswith rigid arms.
2. BACKGROUND DATA/ STATE OF TEIE ART
There are known in the art ' ;rh~;, I machines with rigid arms used for
rock. A problem which was not solved by these machines was that they
10 were limited to small flow rates and they were based mainly on attrition and
grinding, using in very small degree the impaction for r ~ - g Also the inside
of these machines tried to eliminate as much as possible the air
agitation inside. Because of this the present state of the art machines eYperience
severe wear and are limited to small flow rates.
The mining industry reqnired for a couple of decades a system to be able
to pulverize the ore down to 200-300 mesh directly after the first stage of crushing-
usually after the jaw or gyratory crushers. This would make it possible to go
directly after the primary crusher to the cyanide process in the case of gold ore
21~7~66
.
The main machine used for ~ .. O in the mining industry is the ball
mill. This machine has some ~ ' O is ~ ' " g the material, is ~sing
large amount of power(because the process is slow), is large, has low . . ~I . ;I.y,
5 and has extreme high costs associated with its '
SUMI\IARY OF T~E INVENTION
The above l~..lv ' O were eliminated by the rock pulverizer system
proposed in the present invention by the fact that is made of:
-a vertical rigid shaft having an upper part and a lower part;
10 -whereby at the upper and lower part of the rigid shaft having bearings as follows:
at the upper part an upper bearing and at the lower part a lower bearing
-whereby the bearings permit rotation of the vertical shaft around its a~is of
symmetry;
-a rigid r~ct- nO ' frame with an upper part and an lower part;
15 -whereby the said bearings are placed/fixed ~ on the
upper and the lower parts of the rigid ~ ' frame;
-a circular plate or circular shield rigidly attached by adjusting means to the
vertical shaft in such a way that the vertical shaft is F~ - ' OQ the surface of
the circular shield and the a~is of symmetry of the vertical shaft is passing through
20 the centre of gravity of the circular shield; the circular shield is attached by the
said a~justing means in such a way that it is possible to adjust the position of the
circular shield along the shaft upper or lower;
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-whereby the circular adjustable shield is placed on the vertical shaft
under the upper bearing;
-whereby ~ after the circular adjustable shield or circular plate, there
is attached to the vertical shaft, by adjusting means a rigid rotor assembly, this
5 rotor assembly having rigid arms, rigidly attached to the rotor, this rigid rotor
being called the first shock impacting rotor;
-whereby i ' ~ after the first shock impacting rotor there is attached to the
vertical shaft by adjusting means, a ' ,. rigid rotor assembly, this rotor
assembly having rigid arms, rigidly attached to the rotor, this rotor being called
10 the main shock impacting rotor or the second rotor;
-whereby ~di~ply after the main shock impacting rotor there is attached to
the vertical shaft by adjusting means, a rigid rotor assembly, this rotor assembly
havin~ rigid arms rigidly attached to the rotor, this rotor being called the last shock
nmpacting rotor;
15 -whereby after the last shock impacting rotor there is the said lower bearing;
-the rock r ~ - - g system g in ~
-a cylindrical drum having a diameter of 80-100 inch placed inside the rigid frame
so that their a~es of symmetry: ' t, the cylindrical drum having an upper
part and a lower part;
20 -whereby the vertical rigid shaft is placed with its a~is in the centre of the said
frame and drum;
-whereby the position of each rigid rotor being adjustable along the vertical shaft
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by the said ~d; l J~ O means;
-a bell like cover covering the lower bearing placed on the lower part of the rigid
I I O ' frame;
-a disk like dust protection object fixed on the vertical sha~t i ' ~ above
5 the lower bearing and above the bell like cover -when the shaft rotates, the disk
like dust protection object ~ rirbo.ll~.. away any dust close to the lower bearing;
-also placed on the lower part there is a wedge like dust deflector attached rigidly
to the bell like cover and to the rigid ..,. O ' frame assembly;
-whereby the .J'' ` h,~l drum having at the upper part a cover, with a circular
10 opening through which the vertical shaft is passing, also the cylindrical drum
having a rc~ O ' opening called the inlet opening;
-a cone shaped chute placed inside and at the upper part a of the drum with the
large diameter placed on the cover and the lower diameter being oriented
IW.~ 17~, that is the cone shaped chute is oriented with the virtual tip of the
15 cone d(..1.~..ld~"sothatthe inclined surface ofthe coneshapedchuteismaking
an angle of 45 degrees with the vertical wall of the cylindrical drum;
-whereby the diameter of the rigid circular plate is equal or slightly larger than the
small diameter of the cone shaped chute;
-whereby the rigid circularplate is placed ata certain distance from the cone
0 shaped chute this distance being bigger than the ma~imum size of the rock to be
d,
-in: ' , the rock r ~ - O system ~ 6 to 8 vertical
2I47~6~
elements -these elements being in form of angle irons
placed with the corner to the inside of the cylindrical drum and with the wings on
the inner vertical surface of the cylindrical drum;
-whereby the inner surface of the cylindrical drum and the deflecting impacting
5 elements being plated with r. r ~ shock and abrasive resistant wear plates;
-whereby the tips of the arms of the second rotor being distanced from the corner
of the d " ~ r , - V elements, with at least 1 inch;
-also the rock l;- '- ~. O system ~ another cone shaped nnetal sheet
directing element similar with the cone shaped chute, having the same larger
10 diameter, having also an angle of 45 degrees with the vertical, placed in a similar
way with the cone shaped chute but having the inner diameter larger, the height of
this cone shaped directing element being equal with the height of the angle
deflecting / . ~ v' elements measured on the radius of the cylindrical drunn;
-wherebythe loweredge ofthetips ofthesecondrotor being 114"higherthan
15 the inner edge ~ - 2 with the snnaller diameter of the directing cone
shapedi element;
-wherebythe vertical angle~ elements being .~
' ' in the areas where the tips of the first impacting rotor are, so that
the said tips are passing through the space of d ~ elements, the
20 said tips being distanced within an inch from the inner snrface of the cylindrical
drum, and one inch from the deflecthlg /impacting elements, that is7 these tips have
in the moment when they pass through the cut trough the deflecting innpacting
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elemcnts a distance of one inch to the in~mediate - , ,. ' ~ objects(the drum,
etc);
-also the rock ~ system another cone shaped metal sheet
directing element similar with the cone shaped chute, having the same larger
5 diameter, having also an angle of degrees with the vertical, placed in a similar way
with the cone shaped chute but having the inner diameter larger, the height of this
cone shaped directing element being eqnal with the height of the angle deflecthlg
/impacting elements measured on the radins of the cylindrical drum;
-whereby the lower edge of the tips of the last rotor being with 1/4" higher than
10 the inner edge .ni, . .~ with the smaller diameter of the directing element;
-whereby the tips of the arms of the last rotor being distanced from the corner of
the ' "- ~,/ , g elements with at least one inch;
-whereby " '~ under the cylindrical drum there is an open receiving space
or plenum chamber ending directly on a belt conveyor, so that the pulverr~ed
15 material is totally contained when it is getting out of the machine;
-also at the upper part of the vertical shaft being a belt pulley;
-an electric motor with belt pulley;
-belts;
-whereby the electric motor is driving the belts and the pulley, t~e shaft;
20 -an enclosed conveyor with an enclosed hood connected to the inlet opening;
-whereby the arms of the rotors are plated with r~, ' ' ~ , ' / ' ~;,
resistant plates facing the direction of .~ ~;
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-whereby the arms of the rotors have a portion of them machined on both sides
with inclined walls with angles of S degrees from vertical;
-whereby the rotors having recesses with inclined walls at 5 degrees from vertical;
-whereby the arms of the rotors are fi~ed to the rotors with screws ,the arms beiLtg
5 placed in the milled recesses with inclined walls;
-an enclosed bottom hood, sealing the dust against the belt conveyor, with
rubber lips and rubber flaps so that the dust is unable to get out from the
pulverizer space;
The way the rock ~ O system is working is as follows:
10 The enclosed conveyor is bringing the material to be pulverr~ed or the rock to the
inlet opening; the rock is entering in the drum via the inlet opening ;the electric
motor and pulley drive the shaft at 1000-llO0 rpm via the pulley at the upper part
of the ~ertical shaft O 3 tip speeds of the rotors no more than 100 m/s; the
rock is falling on the cone shaped chute; the rock is falling ml the circular plate
15 ,where is ~ ;rbco~ d by Coriolis forces to the periphery of the drum against the
vertical ' '' ~ A ~ O elements ;then the material is presented to the tips of
the first shock impacting rotor which is imparting the first shock blows at cca 100
m/s ( cca 300 feet per second) to the incoming rocks; in the moment of impact,
' cracks are i d ~ the cracks are ~ t~ ' almost with the
20 speed of sound in the rock(~ 1C C ~ m/s)-so in thousands of a second the rock is
split in small pieceS by the shock waves initiated by the arms; also the tips of the
arms of the first shock impacting rotor are passing through the said cut through
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the deflecting impacting elements so that any rock being there will be shock
impacted and sheared; the generated small fragments of rock are recoiled against
the deflecting vertical bars and against the cone shaped chute and against the
incoming larger pieces of rock; g to come from upstream; the split pieces
S cmltinue to fall under the influence of gravity but being however airborne; the rock
fragments are passing over the tips of the first rotor and after impacting against the
vertical deflectors are forced to remain for a while inside the space between the
first and the second rotors; because of the fact that between the rotor tips and the
drum is a small gap-in this case 1 inch the rock fragments are forced by the
10 ~..I.;fi.~,..l and ~ forces to do a statistic recoiling and sonic breaklng
combining the effects of self . - 3, direct impacting and shock wave cracking,
the whole aero and material mass in the space between rotors having over 16
rotations per second and peripheral speeds of up to 100 m/s and ~ fi.~..l and
Coriolis a..~h . I' - in the range of 1000 g and shock a~ r- in e~cess of
15 lO,OOOg; it is also important to note that for the heaviest rock the flying airspeed is
cca 3~ m/s-in this case we have in e~cess of 100 m/s at the periphery; the material
recoiled in the middle will have the tendency to fall on the rotor but will be
e..ll ;r..g..l~d by strong Coriolis forces in the rotor tips area where
severe shocks will be ~ d and the cracking process will be continued; the
20 eA~ .- proved that the above gaps, speeds and diameters will assure the
of the material to small size and having cca 1-2 % isolated 1/2 -3/4
inch splinters; these splinters will pass to the second . associated with
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the second shock impacting rotor where the process continues; the
proved that one main rotor is enough to provide 200- 300 mesh sh~ing; however,
there is a last c. r formed between the last main rotor and the last rotor
where the pulverized material is ~ to the periphery of the drum
5 impacting and jumping over the vertical deflectors; the gravib will move this layer
down slowly but ~ when it reaches the tips of the last impacting rotor
the pulverized material is recoiled violently against the cone shaped directing
element bringing the material back in the impacting ~ . g area; we have
altogether here the following r- -- a O.~.v - -' field assuring the down
.. t, a fluidic diode effect caused by the cone shaped elements also assuring a
down drafty ~. t, a flying ~ field making all particles to be
airborne-to ny a strong ~ irhOal field making the particles to be pushed to the
periphery of the drum and to be forced to be recoiled by the internal ~
of the drum and the dellecting vertical bars ,also a ~ ' of the above ,a
15 rotational thoroidal vorte~ with the symmetry a~is coincident with the aYis of the
rotating shallt, this vorte~ being created by the air and material flow pushed by the
c~ r~O..I forces against the walls and the cone shaped elements; this comple~
kinematic spectra ~ 1, .. O becanse the material and air are c~ by the
arms and when is reaching the cone shaped elements they go up against the wall and
20 then, when is reaching th~ nnderside part of the upper cone shaped element, they
are directed down against the arms or in the space around the tips of the arms, at
the same time there is a circular trail of vorte~es at the tips of the arms created by
21~7~6~
the fact that the particles of rock and the air in the boundary layer close to the wall
of the drum tends to remain behind but the air and the particles at the tips of the
arms are violently entrained by the fast moving boundary layer associated with
the tips; also the angle irons deflectors are bringing the material back in the
5 boundary layer associated with the tips, in the process the material is innpacted
against the material in a dynamic way which is ~ , O the ~ 1~ and
mean time because of the gravity, because of the said fluidic diode
effect of the cone shaped elements, and because of a slight draft created by the
movement of the belt conveyor the pulverized material will fall in the settling area
10 above the belt coDveyOr; this settling area is totally sealed by the lips; the
pulverized material is evacuated by the belt conveyor ;a . . ' .~ sealing is
assured by the rubber flaps at the e~it of the b~lt conveyor; in this way the whole
system is sealed at the inlet and at the ontlet and the belt conveyor movement and
the cone shaped elements in the drum make the air to move . ' that is
15 jn a dcwndraft mode creating a slight negative pressure inside the drum which is
'n O to the dust 7ll
BRIEF DESCRIPTION OF TE~E DRAWINGS
A full v~ ~ of the invention can be gained from the following
J~ r of the preferred; ' . ' when read in ~ . with the
20 ~ - g drawings in which:
Fig l-P~ view ofthe rock~ ~.. ,system.
Fig 2-Sectional view of the rock ~ ' . .. system-the drum/rotors detai!s.
21~7666
Fig 3-Sectional detail of the bottom of the drum-the open bottom concept.
Fig 4-Rotor /drum
DESCRIPTION OF TEE PREEE:RRED EIUBODIMENTS
The invention is suitable for replacing the ' ' stages from the
primary crusher till the first chemical treatment of the ore when it is necessary to
have pulverized material from 200-300 mesh size.
As it is seen in the ~ . ,y g '' " the rock ~ system
proposed is, . ' O
-a vertical rigid shaft I having an upper part 2 and a lower part 3;
-whereby at the upper and lower part of the rigid shaft having bearings as follows:
at the upper part an upper bearing 4 and at the lower part a lower bearing 5;
-whereby the bearings permit rotation of the vertical shaft around its a~is of
symmetry;
-a rigid . ~ ~ frame 6 with an upper part 7 and an lower part 8;
-whereby the said bearings are placedmxed ~ on the
upper and the lower parts of the rigid l . ~ ' frarne;
-a circular plate or circular shield 9 rigidly attached by adjusting means 10 to the
vertical shaft in such a way that the vertical shaft is ~ - ' on the surface ofthe circular shield and the axis of symmetry of the vertical shaft is passing through
the centre of gravity of the circular shield; the circular shield is attached by the
said adjusting means in such a way that it is possible to adjnst the position of the
21~766S
12
circular shield along the shaft upper or lower;
-whereby the circular adjustable shield is placed on the vertical shaft .,- .
under the upper bearing;
-whereby ~ after the circular adjustable shield or circular plate, there
5 is attached to the vertical shaft, by adjusting means 11 a rigid rotor assembly 12,
this rotor assembly having rigid arms 13, rigidly attached to the rotor, this rigid
rotor being called the first shock impacting rotor;
-whereby ~ ot~ly after the first shock impacting rotor there is attached to the
vertical shaft by adjusting means 14, a ' . rigid rotor assembly 15, this
10 rotor assembly having rigid arms 16, rigidly attached to the rotor, this rotor being
called the main shock impacting rotor or the second rotor;
-whereby - ~ after the main shock impacting rotor there is attached to
the vertical shaft by adjusting means 16a, a rigid rotor assembly 17, this rotor
assembly having rigid arms 18 rigidly attached to the rotor, this rotor being called
15 the last shock impacting rotor;
-whereby after the last shock impacting rotor there is the said lower bearing;
-the rock ~ . 5 system ~ in;
-a cylindrical drum 19 having a diameter of 80-100 mch placed inside the rigid
frame so that their a~es of symmetry ~ ' ~, the cylindrical drum having an
20 upper part 20 and a lower part 21;
-whereby the ~ertical rigid shaft is placed with its aYis in the centre of the said
fran~e and drnm;
21~7666
-whereby tbe position of each rigid rotor being adjustable along the vertical shaft
by the said adj~ O means;
-a bel~ like cover 22 covering the lower bearing placed on the lower part of the
rigid ~,. O ' frame;
5 -adisklike dust protection object 23 fi~ed on theverticalshaft i ~
above the lower bearing and above the bell like cover -when the shaft rotates, the
disk like dust protection object; ' irl.odt~., away any dust close to the lower
bearing;
-also placed on the lower part there is a wedge like dust deflector 24 attached
10 rigidly to the bell like cover and to the rigid rt. ' " ' frame assembly;
-whereby the .J'- ' ;Lal drum having at the upper part a cover ~5, with a circular
opening 26 through which the vertical shaft is passing, also the cylindrical drum
having a r~i.; O ' opening 27 called the inlet opening;
-a cone shaped chute 28 placed inside and at the upper part a of the drum with
15 the larOe diameter placed on the cover and the lower diameter being oriented
d .... ..1 dj, that is the cone shaped chute is oriented with the virtual tip of the
cone ~ .. -. ... d " so that the inclined surface of the co~e shaped chute is making
an angle of 45 degrees with the vertical wall of the cylindrical drum;
-whereby the diameter of the rigid circular plate is equal or slightly larger than the
20 small diameter of the co~e shaped chute;
-whereby the rigid circular plate is placed at a certain distauce 29 from the cone
shaped chute this distance being bigger than the ma~imum sr~e of the rock to be
2I~6~
14
-in the rock ~ ~ .. g system , ~ 6 to 8 vertical
d n - ~r ~ g elements 30 -these elements being in form of anglc irons
placed with the corner 31 to the inside of the cylindrical drum and with the wings
5 32 on the inner vertical surface 33 of the cylindrical drum;
-whereby the inner surface of the cylindrical drunn and the deflecthlg impacting
elements being plated with n, ~ ~ '' shock and abrasive resistant wear plates 34;
-whereby the tips 3~ of the arms of the second rotor being distanced 36 from the
corner of the d~ fl~ g elements, with at least 1 inch;
10 -also the rock 1~ O system ~ - O another cone shaped metal sheet
directing element 37 similar with the cone shaped chute, having the same larger
diameter, having also an angle of 45 degrees with the vertical, placed in a similar
way with the cone shaped chute but having the inner diameter larger, the height of
this cone shaped directing element being equal with the height of the angle
15 deflecting r . - g elements measured on the radius of the cylindrical drum;
-whereby the lower edge 38 of the tips of the sccond rotor being 1/4" higher than
the inner edge rCrJ~ - gO with the smaller diameter 39 of the directing cone
shaped element;
-wherebythe vertical angle ' ' ~ , elements being ,, . ~'
20 ~ 40 in the areas 41 where the tips of the first impacting rotor are, so
that the said tips are passing through the space 42 of ' ~ O' , - Ig
elements, the said tips being distanced 43 within an inch from the inner surface of
21 ~ 7~66
the cylindrical drum, and one inch 44 from the deflecting r . ~ elements, that
is, these tips have in the moment when they pass through the cut trough the
deflecting impacting elements a distance of one inch to the ' ~^ ~u,
drum, etc);
S -also the rock ~ system ~ ~ another cone shaped metal sheet
directing element 46 similar with the cone shaped chute, having the same larger
diameter, having also an angle of degrees with the vertical, placed in a similar way
with the cone shaped chute but having the inner diameter larger, the height of this
cone shaped directing element being equal with the height of the angle deflecting
10 rlmpacting elements measnred on the radius of the cylindrical drum;
-whereby the lower edge of the tips 47 of the last rotor being with 1/4" higher
than t~le inner edge c ~ ' o with the smaller diameter 48 of the directing
element;
-whereby the tips of the arms 49 of the last rotor being distanced from the corner of
the d ^'- 07r . - 2 elements 50 with at least one inch;
-whereby - ' t~ly under the cylindrical drum there is an open receiving space
or plenum chamber 51 ending directly on a belt conveyor 52, so that the
pulverized material 53 is totally contained when it is getting out of the machine;
-also a~ the upper part of the vertical shaft being a belt pnlley 54;
20 -an electric rnotor 55 with belt pulley 56;
-belts 57;
-whereby the electric motor is driving the belts and the pulley, the shaft;
214766~
16
-an eDclosed conveyor 58 with an enclosed hood 59 connected to the inlet opening;
-whereby the arms of the rotors are plated with rCr ~ .7; .
resistant plates 60 facing the direction of .~ ~,
-whereby the arms of the rotors have a portion of them 61 machined on both sides
5 62 with inclined walls 63 with angles of 5 degrees from vertical;
-whereby the rotors having recesses 64 with inclined walls 65 at 5 degrees from
vertical;
-whereby the arms of the rotors are fi~ed to the rotors with screws 66 ,the arms
being placed in the milled recesses with inclined walls;
10 -an erclosed bottom hood 67, sealing the dust against the belt conveyor 52, with
rubber lips 68 and rnbber flaps 69 so that the dust is unable to get out from the
pulverizer space;
The way the rock I~ v system is working is as follows:
The enclosed conveyor is bringing the material to be pulverized or the rock to the
15 inlet opening; the rock is entering in the drum via the inlet opening ;the electric
motor and pulley drive the shaft at 1000-1100 rpm via the pulley at the upper part
of the vertical shaft O ~ tip speeds of the rotors no more than 100 m/s; the
rock is falling on the cone shaped chute; the rock is falling on the circular plate
,where is .c..~- ;r..6.-t~d by Coriolis forces to the periphery of the drum against the
20 vertical d '- ~ ' , O elements ;then the material is presented to the tips of
the first shock irllpacting rotor which is imparting the first shock blows at cca 100
m/s ( cca 300 feet per second) to the incoming rocks; in the moment of impact,
21~7666
17
' ' . ctional cracks are I ~ ' the cracks are . ~ I ~ ' almost with the
speed of sound in the rock(2~ ~ 1 ~ ~ m/s)-so in thousands of a second the rock is
split hl small pieces by the shock waves initiated by the arms; also the tips of the
arms of the first shock impacting rotor are passing through the said cut throughthe ~eflecting impacting elements so that any rock being there will be shock
impacted and sheared; the generated small fragments of rock are recoiled againstthe deflecting vertical bars and against the cone shaped chute and against the
incoming larger pieces of rock c g to come from upstream; the split pieces
continue to fall under the influence of gravity but being however airborne; the rock
fragments are passing over the tips of the first rotor and after impacting against the
vertical deflectors are forced to remain for a while inside the space bet veen the
first and the second rotors; because of the fact that between the rotor tips and the
drum is a small gap-in this case 1 inch the rock fragments are forced by the
;rbhdl and ~ forces to do a statistic recoiling and sonic breaking
combining the effects of self impacting, direct impacting and shock wave cracking,
the whole aero and material mass in the space between rotors having over 16
rotations per second and peripheral speeds of up to 100 m/s and ~ . ;rht,dl and
Coriolis a. .~ l~. in the range of 1000 g and shock accel~. in e~cess of
10,00Cg; it is also important to note that for the heaviest rock the flying airspeed is
cca 35 m/s-in this case we have in e~cess of 100 m/s at the periphery; the material
recoiled in the middle will have the tendency to fall on the rotor but will be
~ c.i..l- irh~dt~d by strong Coriolis forces in the rotor tips area where
2147~B~
18
severe shocks will be ' ~ and the cracking process will be continued; the
esperience proved that the above gaps, speeds and diameters will assure the
of the material to small sr~e and having cca 1-2 % isolated 1/2 -3/4
inch splinters; these splinters will pass to the second . I~; associated with
5 the second shock impacting rotor where the process continues; the e~periments
proved that one main rotor is enough to provide 200- 300 mesh sr~ing; however,
there is a last . - formed between the last main rotor and the last rotor
where the pulverr~ed material is ~ ir~ O ' to the periphery of the drum
impacting and jumping over the vertical deflectors; the gravity will move this layer
10 down slowly but ' '.~ when it reaches the tips of the last impacting rotor
the pulverized material is recoiled violently against the cone shaped directing
element bringhlg the material back in the impacting ~ ~. O area; we have
altogether here the following ,)1 a O..lv ' field assuring the down
.. t, a fluidic diode effect caused by the cone shaped elements also assurhlg a
15 down drafty . . t, a flying &.,. ~ ~ field making all particles to be
; ~ to fly a strong ;rho~d field making the particles to be pushed to the
periphery of the drum and to be forced to be recoiled by the internal ~
of the drum and the deflecting vertical bars ,also a ~ ' of the above ,a
rotational thoroidal vorte~ with the symmetry a~is coincident with the asis of the
20 rotating shaft, this vortex being created by the air and material flow pushed by the
;rhO~.I forces against the walls and the cone shaped elements; this comple~
kinematic spectra ~ . r ' O because the material and air are .~ irLO.II~d by the
21~766~
19
arms and when is reaching the cone shaped elements they go up against the wall and
then, when is reaching the underside part of the upper cone shaped element, theyare directed down against the arms or in the space around the tips of the arms, at
the same time there is a circular trail of vorte~es at the tips of the arms created by
the fact that the particles of rock and the air in the boundary layer close to the wall
of the drum tends to remain behind but the air and the particles at the tips of the
arms are violently entrained by the fast moving boundary layer associated with
the tips; also the angle irons deflectors are bringing the material back in the
boundary layer associated with the tips, in the process the material is impactedagainst the material in a dynamic way which is - . "r~' O the - and
n; mean time because of the gravity, because of the said fluidic diode
effect of the cone shaped elements, and because of a slight draft created by themovement of the belt conveyor the pulverized nnaterial will fall in the settling area
above the belt conveyor; this settling area is totally sealed by the lips; the
pulverized material is evacuated by the belt conveyor ;a ., ' ~ sealing is
assured by the rubber flaps at the e~it of the belt conveyor; in this way the whole
system is sealed at the inlet and at the outlet and the belt conveyor movement and
the cone shaped elements in the drum make the air to move I c ' that is
in a ~ .... .Irl mode creating a slight negative pressure inside the drum which is
g to the dust '~
The ~ of this proposed inventions are as follows:
in one pass of 200-300 mesh starting from 6-8 inch material
21~7~S6
F ~ to process silica rock
- low wear rate
-low energy ~:
-low
-low cost
,. .- .~,
-improved ac. ~,d.~ behaviour
-good dust c
-compact structure
-uses ' ~ the dynamic material on material ~ . F effect
