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Патент USA US3078061

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Feb. 19, 1963
w. R. PATTERSON
AUTOMATIC CRUSHER
Filed oct. 11, 1960
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3,078,051
3,078,051
3
43 remains off while the time sequence device is operating
and until the feed speed has been changed. However, if
the low horsepower per ton per hour signal persists after
the feed change is completed, the entire feed increase
sequence is repeated until the condition is corrected or
the feed exceeds its predetermined limit.
As mentioned above, the signal from the horsepower
per ton per hour instrument 30 is also applied to a de
crease sctting switching device 48. This setting device
4
crease setting switch to go to full output. The output
of switch 66 after a time delay goes to time sequence
device 80 which operates motor 54 to change the setting
of rheostat 36. This causes an unbalance between rheo
stats 35, 36 which in turn causes the position setting
motor `59 to operate as explained above. The motor
in this case actuates the hydraulic lift means 14 to in
crease the sett-ing of the crusher. If the signals from the
horsepower per ton per hour instrument and the minimum
signal is supplied. lf the horsepower per ton low condi
tonnage switch persist after the crusher setting has been
changed, the entire sequence will be repeated and the
setting of the crusher will be increased in periodic time
tion persists until a further increase in the feed would
exceed the capacity of the crusher, a switch is actuated
increments until the horsepower per ton per hour is re
turned to the desired range or the amount of tonnage
48 is biased to a greater value than the feed increase
device 43 and hence will not conduct until an additional
which prevents further increases in feed and directs an 15 processed goes above the preset minimum value.
If for any reason the feed rate is such that the hopper
additional signal to the decrease setting device. When
«60 which is above the crusher chamber 11 is filled to
the chamber 11 of the crusher 10 ñlls, a suitable limit
an overñow condition, an electric signal is applied to the
switch is closed to direct a current to a chamber full
feed decrease switching device 61 by the hopper full
switching device 50. This current overcomes the bias
on the chamber full switching device Se (another mag 20 switch 63 which will cause periodic decreases in the feed
speed until the amount of material in the hopper is re
netic amplifier or transistor) and causes it to go to full
duced below the chamber full level. In the illustrated
system this is accomplished by cutting olf the bias on
the
hopper full switch 63 (a magnetic amplifier) so that
further feed increases. A second output of the chamber
full switching device 50 is applied to the decrease setting 25 it conducts and supplies a signal to the feed decrease
device 61.
switching device 48.
If the feed overflows »the hopper 60, the start-stop
The output from the chamber full device 50 plus the
switch 71 is opened to cut olf feed to the hopper. This
output from horsepower per ton per hour device 30 over
is »accomplished by removing or overcoming the bias on
comes the bias on the decrease setting switch 48 and
30 the feed stop magnetic amplifier 72 so that it no longer
causes it to conduct to a time sequence switch 52 after a
conducts -to the solenoid 73 which normally holds the
predetermined time delay. The time sequence switch 52
start-’stop switch 71 in a conducting position. The switch
operates a motor 54 which in turn operates rheostat 36
71 when open prevents the ñow of current to the variable
to change its position. 'This causes an unbalance be
speed drive 17 that drives the feed conveyor 16.
tween the rheostats 35, 36 which results in a current
If for any reason, such as lack of feed on the con
flow in setting motor control circuit 55. This closes con
veyor, the horsepower being drawn `by the crusher falls
tacts 56 which connect the setting motor 59` to a source
below -the preset range of the motor, a signal is sent that
of power not shown. A current then flows in the setting
stops further changes in the feed and sounds a warning
motor 59 causing it to operate and drive the hydraulic
lift means 14 to decrease the setting of the crusher. De 40 that the machine is not operating Within the desired range.
This signal could come from either the horsepower or
creasing the setting of the crusher means to decrease
the tons per hour instrument but as shown in the drawing
the minimum clearance between the mantle 15 and the
it goes from «the horsepower instrument 29 to the feed
chamber casing 11. If the signals from the chamber
increase device 4‘3, the feed decrease device 61 and a
full switch 50 and horsepower per ton per hour instru
warning light 81.
ment 30 persist after the setting change has been made,
As it has been pointed out in connection with the graph
the crusher setting will be lowered further periodically
in
FIG. 1, it is desirable to maintain the operation of
in preset time increments until the desired horsepower
the crusher as close as possible to its maximum horse
per ton per hour is restored.
power per ton per hour output short of packing. To
When the operation of the crusher is such that the
facilitate this an electric pulse device 83 is provided
horsepower per ton per hour is higher than the preset
which periodically sends a short time signal to the feed
range, an electric signal is transmitted from the horse
increase device 43. This of course tends to increase the
power per ton per hour instrument 30 to the feed decrease
feed. However, if the feed change takes the crusher
switching device 61 and the increase setting device 66.
out of the desired operating range, which is up along the
The feed decrease switching device 61 after a predeter
flared portion of the curve in FIG. 1, the crusher would
mined time delay causes a time sequence unit 62 to con
start to pack and the horsepower per ton per hour instru
duct to produce a feed decrease in substantially the same
ment would send a signal to reduce the feed and -bring it
way as' was described above in connection with the feed
back within the desired r-ange of operation for the ma
increase except that it decreases the rate of feed rather
chine. The pur-pose of the pulsing device is to keep the
than increasing the rate.
crusher operating near the upper limit of the desired
Asl mentioned in connection with decrease `setting de 60 operating range of horsepower per ton per hour by peri
vice 48, the increase setting switching device 66 is biased
odically trying to increase the feed to the crusher.
to a greater value than the feed decrease device 61 and
When the feed falls back within the hopper 60, the
will have no output from the horsepower per ton per
solenoid operated start-stop switch 71 is closed. This
hour signal alone. Therefore, the feed speed will thus
again connects the variable speed drive 17 to a source
output. One output of the chamber full switching device
Si) is applied to the feed increase device 43 to stop any
be decreased periodically in preset increments until the 65 of power and starts the feed drive under automatic con
load condition is corrected or until the tonnage indicated
trol. All of the instruments 21, 29, 30; the feed device
on the tons per hour instrument becomes lower than a
43, 44; the setting devices 48, 66; the time sequence de
predetermined minimum tonnage desired, in which case
vices 44, 52, 62, S0; the pulsing device 83; the chamber
a switch 68 on the tons per hour instrument 21 is closed
full device 50; the hopper full device 63; and the feed
to apply a signal to the feed decrease switching device 70 stop device 72 are connected to a suitable source of power
such as a standard 120 volt supply. For simplicity, the
'61 to stop any further decrease in the feed rate. Closing
wiring to all of these elements is not shown in the draw
of the minimum tonnage switch 68 also applies a further
signal to the increased setting switch 66 which supple
ments the signal from the horsepower per ton per hour
instrument 30 to overcome the bias and cause the in 75
ing but anyone skilled in electronics could provide suit
able wiring to supply power as indicated.
There are electronic devices readily available on the
3,078,051>
5
6
commercial market for performing the functions set out
in connection with the feed increase switch, the Iltime se
quence switch and other elements mentioned above. For
chamber and removing material that has passed through
example, the described feed increase switch, the time
said chamber; means for setting the position of said man
tle relative to said chamber; means -for measuring the
horsepower consumed by the crusher per ton of material
crushed per hour; means for producing a first electric
signal when the horsepower per ton per hour of said
sequence switches and the setting devices can be either
magnetic amplifiers or transistors. These elements can
be biased by methods well-‘known in the electronics field
crusher deviates from a predetermined range; means re
sponsive to said first signal for varying the volume of
to have the characteristic indicated for the devices de
scribed. The time delay means can be a suitable capaci
feed to said crusher; means for producing a second elec
tor or any other well-known electronic element that pro 10 tric signal when said crusher chamber is full of feed;
vides a time del-ay lbefore conducting.
means responsive to said second signal for preventing
The above-mentioned electronic devices are especially
further increases of the rate of feed to said crusher,
suitable for a control system such as described because
means responsive to the sum of said first and second sig
of the-ir .rugged characteristics, their com-plete lack of
nals for decreasing the setting of said mantle relative
moving parts and their inherent freedom from mainte 15 to said chamber; means for producing a third signal when
nance attention. Many of the indicated devices are capa
the rate of material being crushed by said crusher falls
ble of receiving one `or more input signal-s to produce the
below a predetermined value, means responsive to said
desired output function.
third signal .to prevent further decreases in the rate of
. Although but lone embodiment has been illustrated and
feed to said crusher, means responsive to the sum of
described, it will be apparent to those skilled in the art 20 said first and third signals for increasing the setting of
that various changes and modifications maybe made
said mantle relative to said chamber.
therein without departing from the spirit of the invention
5. In a crusher having a mantle mounted for rotation
or from the scope Iof the appended claims.
within a chamber; means for feeding material into said
Having now particularly described and ascertained the
chamber and removing material that has passed through
nature of my said invention and 4the „manner in which it 25 said chamber; means for setting the position of said man
is to be performed, I declare that what I claim is: ’ Y
tle relative to said chamber; means for measuring the
l. In a crusher having a mantle mounted for rotation
horsepower consumed by the crusher per ton of material
within a chamber; means for feeding material into said
crushed per hour; means for producing a first electric
chamber; means for setting the position of said mantle
signal when the horsepower per t0n per hour of said
relative to said chamber; means for measuring the horse 30 crusher exceeds a predetermined range; means respon
power consumed by the crusher per ton of material
sive to said first signal for decreasing the rate of feed
crushed per hour; means for producing a first electric
to said crusher; means for producing a second signal
signal when the horsepower per ton per hour of said
when the horsepower per ton per hour of said crusher
crusher deviates `from a predetermined range; means re
falls below said predetermined range, means responsive
sponsive to said first signal for varying the volume of 35 to said second signal for increasing the rate of feed to
feed to said crusher within predetermined limits and
said crusher, means for producing a third electric signal
means for producing a second electric signal after said
when said crusher chamber is full of feed; means re
feed has reached its predetermined limit, and means re
sponsive to said tlL'rd signal for preventing further in
sponsive to the sum of said signals for Varying the setting
creases in the rate of feed to said crusher, means re
of said mantle relative to said chamber.
40 sponsive to the sum of said lsecond and third signals for
2. In a crusher having a mantle mounted for rotation
decreasing the minimum space between said mantle and
Within a chamber; means for feeding m-aterial into said
said chamber; means for producing a fourth signal when
chamber; means for setting the position of said mantle
the rate of material being crushed by said crusher falls
relative to said chamber; means for measuring the horse
below a predetermined value, means responsive to said
power consumed by the crusher per ton of material 45 fourth signal to prevent further decreases in the rate of
crushed per hour; means for producing a first electric
signal when the horsepower per ton per hour of said
feed to said crusher, means responsive to the sum of
said first and fourth signals for increasing the minimum
crusher deviates fro-m Ia predetermined range; means re
space between said mantle and said chamber.
sponsive to said first signal for Varying the volume of
6. The apparatus of claim 5 having a hopper positioned
feed ‘to said crusher within predetermined limits and 50 above said chamber for receiving and directing feed into
means for producing a second electric signal when said
chamber is full of feed; means responsive to said second
signal to prevent further increases in the rate of feed to
said crusher, and means respon-sive to the sum of said
said chamber, and means associated with said hopper for
producing an electric signal when said hopper is full,
said means responsive to said first signal being responsive
to
said hopper full signal for decreasing the rate of feed
55
signals for decreasing the minimum space between said
to said chamber.
mantle and said chamber.
7. The apparatus of claim 5 having means for produc
3. In a crusher having a mantle mounted for rotation
ing an electric signal when the horsepower being used
within a chamber; means for feed-ing material into said
by said motor falls below a predetermined value, said
chamber; means for setting the position of said mantle
means responsive to said first and second signals, being
relative to said chamber; means for measuring the horse 60 responsive to said horsepower low signal to prevent fur
power consumed by the crusher per ton of material
ther changes in the rate of feed to said chamber.
crushed per hour; mean-s for producing the first signal
8. The apparatus of claim 5 having a pulse means for
when a horsepower' per ton per hour of said crusher
periodically sending a signal to said means responsive to
deviates from a predetermined range; means responsive
to said signal for varying the volume of feed to said 65 said second signal to increase the rate of feed to said
chamber.
crusher within predetermined limits; means for producing
9. In a crusher having a mantle mounted for rotation
a second electric signal when the weight of material pass
Iwithin a chamber; a variable speed drive for feeding
ing through said chamber falls below a predetermined
material into said chamber, conveyer means for removing
limit, means responsive to said second signal to prevent
further decreases in the rate of feed to said crusher, and 70 material that has passed through said chamber; means
«for setting the position of said mantle relative to said
means responsive to the sum of said signals for increas
chamber; means for measuring the horsepower consumed
ing the minimum space between said mantle and said
chamber.
by the crusher per ton of material crushed per hour;
4. In a crusher having a mantle mounted for rotation
means for producing a first electric signal when the horse
within a chamber; means lfor feeding material into said
power per ton per hour of said crusher exceeds a pre
3,078,051
7
determined range; means responsive, to said iirst signal
for decreasing the speed of said drive to decrease `the
rate of feed to said crusher; means for producing a sec
ond signal when the horsepower per ton per hour ofl said
crusher falls below said predetermined range, means re
sponsive to said second signal for increasing the speed
of said> drive- to- increase the rate of feed to said Crusher;
means for producing> a third electric signal when said
crusher chamber is fulllof feed; means responsive to
said third signal ‘for preventing further increases in the 10
speed of said drive, means responsive to the sum of said
second and third signals for decreasing the minimum
space between said mantle and said chamber; means
for producing a fourth signal when the amount of- ma
terial being crushed per hour by said crusher falls below
a predetermined value, means responsive to said fourth
signal to prevent further decreases in the speed of said
drive, means responsive to the sum of said first and
8
the horsepower per ton per, hour of said crushcr ex
ceeds a predetermined range; means responsive to said
first signal for decreasing the' rate` of feed to said Crusher;
means for producing a second signal when the horse
power per ton per hour of said` Crusher falls below said
predetermined range, means responsive to said second
»signal for increasing the rate of feed to said Crusher;
means for producing a third electric signal when said
crusher chamber is full of feed; means responsive to
said third signal for preventing yfurther increases in the
rate of feed to said Crusher, means responsive to the
sum of said second and third signals for operating said
lift to decrease the minimum space between said mantle
and said chamber; means for producing a fourth signal
when the rate of material, being crushed by said crusher
falls below a predetermined value, means responsive to
said fourth signal to prevent further decreases in the
rate of feed to said Crusher, means responsive to the
sum of said first and fourth signals for operating said
20 lift to increase the minimum space between said mantle
said mantle and said chamber.
and said chamber.
10. In a Crusher having a mantle mounted for rotation
within a chamber; means for feeding material into said
References Cited in the. tile of this patent
fourth signals for‘increasing the minimum space between
chamber, a hydraulic lift connected operatively to said
UNITED STATES PATENTS
mantle to vary- the position of- said mantle relative to
25
Re.
24,185
Staege -___ _____________ _„ July 24, 1956
said chamber; means for measuring the horsepower con
1,815,155
Lewellen __e __________ __ July 2l, 1931
sumed by the Crusher per ton of material crushed per
2,613,878
Hailey _______________ _- Oct. 14, 1952
hour; means for producing -a first electric signal when
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