U.S. patent application number 09/814639 was filed with the patent office on 2002-03-07 for discharge apparatus for discharging materials.
Invention is credited to McFarlane, Claude L..
Application Number | 20020027168 09/814639 |
Document ID | / |
Family ID | 23559122 |
Filed Date | 2002-03-07 |
United States Patent
Application |
20020027168 |
Kind Code |
A1 |
McFarlane, Claude L. |
March 7, 2002 |
Discharge apparatus for discharging materials
Abstract
A discharge apparatus is disclosed for discharging materials
from a container onto an open area such as a field. The apparatus
includes a power discharge device which is disposed adjacent to a
discharge outlet defined by the container. The arrangement is such
that when the apparatus is being used to spread the materials onto
the open area such as the field, the materials move from the
container through the outlet towards the power discharge device for
discharging the materials at a location on the field. A power
source is drivingly connected to the power discharge device for
rotating the power discharge device. A power sensor is provided for
sensing the power supplied by the power source which is
approximately the power used by the power discharge device, the
power sensor generating a first signal which is correlated to the
spread rate of the materials discharged.
Inventors: |
McFarlane, Claude L.;
(Madison, WI) |
Correspondence
Address: |
DAVID J. ARCHER
9790 FOREST PRESERVE RD
DURAND
IL
61024
US
|
Family ID: |
23559122 |
Appl. No.: |
09/814639 |
Filed: |
March 22, 2001 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
09814639 |
Mar 22, 2001 |
|
|
|
09394479 |
Sep 11, 1999 |
|
|
|
Current U.S.
Class: |
239/63 ; 239/670;
239/672; 239/677; 239/69 |
Current CPC
Class: |
A01C 3/06 20130101; A01C
17/008 20130101 |
Class at
Publication: |
239/63 ; 239/69;
239/670; 239/672; 239/677 |
International
Class: |
B05B 012/12 |
Claims
What is claimed is:
1. In a nutrient material spreader comprising a main frame
supported on ground engaging wheels, a tank mounted on said frame
for receiving material to be distributed, a conveyor, a conveyor
drive motor for driving the conveyor so that the conveyor conveys
material received in said tank to a discharge area, an opening in
said tank in the vicinity of said discharge area, and at least one
slinger driven by a slinger motor and mounted outside said tank for
receiving material discharged through said opening and dispersing
the material on a field as the tank is transported over the field,
the improvement comprising: a control system responsive to a
nutrient demand signal for controlling the speed of the auger drive
motor so that nutrient material is conveyed to said opening at a
rate such that a desired weight of nutrient material per unit area
of the field, as specified by said nutrient demand signal, is
dispersed on the field; said control system having sensing means
producing feedback signals and circuit means for determining, from
the feedback signals and said nutrient demand signal, the
difference between the desired weight and the actual weight of
nutrient material per unit area being dispersed, said circuit means
producing an error signal for changing the speed of the auger drive
motor to reduce said difference.
2. The improvement as claimed in claim 1 wherein said sensing means
comprises first sensor means for sensing the speed of the spreader
and second sensor means for sensing the weight of said tank and the
material therein.
3. The improvement as claimed in claim 1 wherein said sensing means
comprises first sensor means for sensing the speed of the spreader
and second sensor means for sensing the weight of nutrient material
on said slinger.
4. The improvement as claimed in claim 1 wherein said sensing means
comprises first sensor means for sensing the speed of the spreader
and second sensor means for sensing the drive torque of said
slinger.
5. The improvement as claimed in claim 4 wherein said second sensor
means comprises a strain sensor for sensing strain in a shaft which
drives said slinger.
6. The improvement as claimed in claim 4 wherein said second sensor
means comprises a pressure sensor for sensing the driving pressure
of the slinger motor.
7. In a nutrient material spreader comprising a main frame
supported on ground engaging wheels, a tank mounted on said frame
for receiving material to be distributed, a conveyor assembly
including an auger rotatably mounted in said tank for conveying
material received in said tank to a discharge area, an opening in
said tank in the vicinity of said discharge area, distribution
means mounted outside said tank, including means in the vicinity of
said opening for receiving material discharged through said opening
and distributing it as the tank is transported over a field, the
improvement comprising: a system having control means for
dynamically controlling the rate at which material is distributed,
said control means provided with a signal based on geographical
nutrient demand data enabling site-specific distribution.
8. In a nutrient spreader having a conveyor driven by a motor for
conveying nutrient material to a slinger which disperses the
nutrient material onto a field, a control system for controlling
dispersal of nutrient material onto the field so that an optimum
amount of nutrient is spread over each cell of the field, said
control system comprising: a memory for storing a table of nutrient
demand data, the table holding therein a nutrient demand value Ws
corresponding to each cell of the field and defining an optimum
weight of nutrient material to be spread per unit area of the
corresponding cell; a global position receiver mounted on the
spreader for determining which cell the spreader is currently
located in, said memory being responsive to said receiver for
reading out the value of Ws for the cell in which the spreader is
located; and, means responsive to a value Ws read from said memory
for controlling the speed of said motor.
9. A control system as claimed in claim 8 and further comprising
means for modifying each value Ws read from said memory to adjust
it for nutrient value before it controls the speed of said
motor.
10. A control system as claimed in claim 8 wherein said memory
holds a plurality of tables, one for each type of nutrient which
might be spread, and means for operator selection of one of said
tables before spreading begins.
11. In a manure spreader having a main frame supported for
transport on ground engaging wheels, a tank mounted on said frame
for receiving manure to be distributed, a conveyor assembly mounted
in said tank and driven by a motor for conveying manure received in
said tank to a discharge area, an opening in said tank in the
vicinity of said discharge area, distribution means mounted outside
said tank in the vicinity of said opening for receiving manure
discharged through said opening and distributing it as the tank is
transported over a field at variable speed, the improvement
comprising: a closed loop control system for dynamically
controlling to a variable set point the rate at which manure is
distributed, said closed loop control system comprising means for
producing a feedback signal representing the average weight of
material distributed per unit of distance traveled, and a
comparator for comparing said signal to said set point to produce a
control signal for controlling the speed of said motor.
12. The improvement as claimed in claim 11 wherein said
distribution means comprises at least one slinger mounted for
rotation about a vertical axis and driven by a variable speed motor
so as to spread manure thereon over a variable width path, and
means for selecting a width of said path.
13. The improvement as claimed in claim 11 and further comprising a
source of nutrient data indicating the nutrient needs of different
cells of said field, and means for deriving said set point from
said source of nutrient data, said closed loop control system
comprising a microprocessor having means for dividing the nutrient
data by a value representing said selected width of said path.
14. The improvement as claimed in claim 13 wherein said nutrient
data is stored in a memory associated wish said microprocessor.
15. The improvement as claimed in claim 13 and further comprising a
GPS receiver for determining what cell of said field the spreader
is located in.
16. The improvement as claimed in claim 15 wherein said nutrient
data is stored in a memory associated with said microprocessor and
addressed by the cell location determined by said GPS receiver.
17. The improvement as claimed in claim 11 wherein said means for
producing a feedback signal comprises a speed sensor for sensing
the ground speed of said spreader, weight sensing means for sensing
the weight of said tank and the manure therein, and a controller
including means for sampling said speed sensor and said weight
sensing means to produce said feedback signal.
18. The improvement as claimed in claim 17 wherein said controller
comprises a microprocessor having means for periodically sampling
said weight sensing means and determining the weight of manure
distributed in a time interval between periodic samplings.
19. The improvement as claimed in claim 11 wherein said
distribution means comprises at least one slinger driven by a
slinger motor to rotate about a vertical axis, and wherein said
means for producing a feedback signal comprises a speed sensor for
sensing the ground speed of said spreader, weight sensing means for
sensing the weight of manure on said at least one slinger, and a
controller including means for periodically sampling said speed
sensor and said weight sensing means and producing said feedback
signal.
20. The improvement as claimed in claim 11 wherein said
distribution means comprises at least one slinger mounted on a
vertical shaft driven by a slinger motor, and wherein said means
for producing a feedback signal comprises a speed sensor for
sensing the ground speed of said spreader, a torque sensor for
sensing the torque required to drive said at least one slinger, and
a controller including means for periodically sampling said speed
sensor and said torque sensor and producing said feedback
signal.
21. The improvement as claimed in claim 20 wherein said torque
sensor comprises a strain sensor for sensing strain in said
shaft.
22. The improvement as claimed in claim 20 wherein said torque
sensor comprises a pressure sensor for sensing the driving pressure
of said slinger motor.
23. The improvement as claimed in claim 11 wherein said
distribution means comprises at least one slinger driven by an
hydraulic slinger motor to rotate about a vertical axis, and
wherein said means for producing a feedback signal comprises a
speed sensor for sensing the ground speed of said spreader, a
pressure sensor for sensing the pressure required to drive said at
least one slinger, and a controller including means for
periodically sampling said speed sensor and said pressure sensor
and producing said feedback signal.
24. The improvement as claimed in claim 11 and further comprising a
manually operable control for varying said set point.
25. A discharge apparatus for discharging materials from a
container onto an open area such as a field, said apparatus
comprising: a power discharge means disposed adjacent to a
discharge outlet defined by the container, the arrangement being
such that when the apparatus is being used to spread the materials
onto the open area such as the field, the materials move from the
container through said outlet towards said power discharge means
for discharging the materials at a location on the field; power
means drivingly connected to said power discharge means for
rotating said power discharge means; and power sensing means for
sensing the power supplied by the power means which is
approximately the power used by said power discharge means, said
power sensing means generating a first signal which is correlated
to a spread rate of the materials discharged.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] The subject application is a continuation of co-pending
patent application U.S. Ser. No. 09/394,479 filed Sep. 11, 1999
which is a continuation-in-part of U.S. Ser. No. 08/871,425 filed
Jun. 9, 1997 now U.S. Pat. No. 6,024,305. All the disclosure of the
aforementioned applications is incorporated herein by
reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a discharge apparatus for
discharging materials from a container onto an open area such as a
field.
[0004] More specifically, the present invention relates to a
discharge apparatus for discharging materials from a manure
spreader container onto any open area such as a field.
[0005] 2. Background Information
[0006] Normally, when manure or other fertilizers are to be spread
over a field to be cultivated, the manure is evenly spread over the
entire surface of the field.
[0007] However, each field has inherent characteristics which make
it advantageous to apply varying quantities of the fertilizer to
different parts of the field.
[0008] For example, certain parts of the field such as a valley
portion may have a relatively deep soil coverage whereas an
elevated portion of the same field may have had much of the soil
eroded therefrom thus requiring a relative increase in soil
nutrient replacement.
[0009] In view of the requirements for a variable spread of manure
over the area of the field, spreader programs have been developed
which optimize the amount of fertilizer required for each portion
of the field.
[0010] The aforementioned programs are sometimes developed by
combining the results of individual soil sample analyses taken from
the various portions of the field. Accordingly, a map of the field
is generated together with a set spread pattern so that the amount
of fertilizer is adjusted manually to correspond with the
previously determined spread requirements.
[0011] Therefore, by utilizing the spreader program, a farmer is
able to raise crops of uniform quality throughout the entire field
under cultivation.
[0012] In recent years, satellites have enabled the accurate
determination of the actual location of a spot on the surface of
the earth within a few feet and to provide not only a read out of
the longitude and latitude but also the elevation of such a
location. Such a means for ascertaining a location is known in the
art as a "global positioning system" or GPS.
[0013] The present invention combines the aforementioned GPS
technology with a land survey such that the actual location of a
spreader spreading material in an open area such as a field can be
continuously monitored. Such a system in combination with a soil
requirement survey enables the generation of a program for
regulating the amount of materials spread at any location on the
open area such as a field.
[0014] Accordingly, for a particular location, the soil requirement
is determined from the survey "map" so that the program generates a
signal which may be used to regulate the amount of materials spread
to optimize crop cultivation.
[0015] More specifically, such regulation may include one or more
of the following discharge regulator arrangements:
[0016] 1) Control of the power supplied from the driving motor to
the discharge means.
[0017] 2) Adjusting the opening of a door between the manure
container and the discharge apparatus.
[0018] 3) Regulating the land speed of the apparatus.
[0019] 4) Altering the rotational speed of a discharge auger
disposed in the materials container.
[0020] Therefore, it is a primary feature of the present invention
to provide a discharge apparatus that overcomes the problems
associated with the prior art proposals and which makes a
considerable contribution to the art of spreading materials and the
like on a field.
[0021] Another feature of the present invention is the provision of
a discharge apparatus that includes a variable delivery discharge
controlled by a program that optimizes the materials spread
pattern.
[0022] Other features and advantages of the present invention will
be readily apparent to those skilled in the art by a careful
consideration of the detailed description contained hereinafter
taken in conjunction with the annexed drawings.
SUMMARY OF THE INVENTION
[0023] The present invention relates to a discharge apparatus and
method for discharging materials onto a field or open area to be
cultivated.
[0024] More particularly, the present invention concerns a
discharge apparatus for discharging materials from a container onto
an open area such as a field. The apparatus includes a power
discharge device which is disposed adjacent to a discharge outlet
defined by the container. The arrangement is such that when the
apparatus is being used to spread the materials onto the open area
such as the field, the materials move from the container through
the outlet towards the power discharge device for discharging the
materials at a location on the field. A power source is drivingly
connected to the power discharge device for rotating the power
discharge device. A power sensor is provided for sensing the power
supplied by the power source which is approximately the power used
by the power discharge device, the power sensor generating a first
signal which correlates to a spread rate of the materials
discharged.
[0025] In another aspect of the present invention, a discharge
apparatus for discharging materials from a container onto an open
area such as a field, includes a power discharge means disposed
adjacent to a discharge outlet defined by the container. The
arrangement is such that when the apparatus is being used to spread
the materials onto the open area such as the field, the materials
move from the container through the outlet towards the power
discharge means for discharging the materials at a location on the
field.
[0026] Also, a power means is drivingly connected to the power
discharge means for rotating the power discharge means.
[0027] A power sensing means senses the power supplied by the power
means which is approximately the power used by the power discharge
means, the power sensing means generating a first signal which is
directly proportional to the spread rate of the materials
discharged.
[0028] In yet another aspect of the present invention, a discharge
apparatus for discharging materials from a container onto an open
area such as a field includes a power discharge means disposed
adjacent to a discharge outlet defined by the container. The
arrangement is such that when the apparatus is being used to spread
the materials onto the open area such as the field, the materials
move from the container through the outlet towards the power
discharge means for discharging the materials at a location on the
field.
[0029] A power means is drivingly connected to the power discharge
means for rotating the power discharge means.
[0030] A power sensing means senses the power supplied by the power
means which is approximately the power used by the power discharge
means, the power sensing means generating a first signal which is
directly proportional to the spread rate of the materials
discharged.
[0031] A control means is connected to the power sensing means such
that the first signal is fed into the control means.
[0032] A means is connected to the control means for generating a
second signal that is fed into the control means.
[0033] The control means includes a comparator circuit for
comparing the first and the second signals, the comparator circuit
generating a third signal based on a comparison of the first and
second signals. The arrangement is such that the third signal is
used for controlling the particular spread rate at which the
materials are discharged so that when the container is moved across
the field, the materials are discharged onto the field at an
optimal spread rate.
[0034] In a further aspect of the present invention a discharge
apparatus for discharging materials from a container onto an open
area such as a field includes a power discharge means which is
disposed adjacent to a discharge outlet defined by the container.
The arrangement is such that when the apparatus is being used to
spread the materials onto the open area such as the field, the
materials move from the container through the outlet towards the
power discharge means for discharging the materials at a location
on the field.
[0035] A power means is drivingly connected to the power discharge
means for rotating the power discharge means and a power sensing
means senses the power supplied by the power means which is
approximately the power used by the power discharge means. The
power sensing means generates a first signal which is correlated to
the spread rate of the materials discharged, the arrangement being
such that a repeatable relationship between the power supplied and
the rate of materials discharged is achieved.
[0036] Many modifications and variations of the present invention
will be readily apparent to those skilled in the art by a
consideration of the detailed description of a preferred embodiment
of the present invention. However, such modifications and
variations fall within the spirit and scope of the present
invention as defined by the appended claims. Included in such
modifications would be the provision of a device secured to the
apparatus for continuously monitoring and analyzing the soil as the
apparatus moves over the field. Such analysis could include
moisture content and/or the mineral content of the soil.
[0037] Also, although the detailed description describes a load
cell arrangement for sensing the tension and the amount of material
discharged, those skilled in the art will appreciate that when a
hydraulic motor is used for driving the power discharge means, the
hydraulic power within the hydraulic motor will be directly related
to the amount of materials discharged. Similarly, in the case of an
electric motor drive, the electrical power supplied will be
proportional to the rate of discharge of the materials.
BRIEF DESCRIPTION OF THE DRAWINGS
[0038] FIG. 1 is a diagrammatic plan view of a survey map of a
field to be cultivated;
[0039] FIG. 2 is a side elevational view partially in section of a
discharge apparatus according to the present invention;
[0040] FIG. 3 is a schematic view of the discharge apparatus shown
in FIG. 2;
[0041] FIG. 4 is a similar view to that shown in FIG. 2 but shows a
further embodiment of the present invention;
[0042] FIG. 5 is a front end view of another embodiment of the
present invention;
[0043] FIG. 6 is a similar view to that shown in FIG. 3 but shows
another embodiment of the present invention;
[0044] FIG. 7 is a similar view to that shown in FIG. 3 but shows
yet another embodiment of the present invention; and
[0045] FIG. 8 is a schematic representation of the discharge
apparatus concept according to the present invention.
[0046] Similar reference characters refer to similar parts
throughout the various embodiments of the present invention.
DETAILED DESCRIPTION OF EMBODIMENTS OF THE PRESENT INVENTION
[0047] FIG. 1 is a diagrammatic plan view of a survey map of a
field to be cultivated. The map shows a field 16 divided into
portions having coordinates a-i, 1-5. The map also shows the
elevation of the field. For example, coordinate e,3 is low lying
and may not require as much fertilizer as portion h,2 which is at a
relatively high elevation of 390 feet.
[0048] FIG. 2 is a sectional view of a discharge apparatus
generally designated 10 according to the present invention.
[0049] As shown in FIG. 2, the discharge apparatus 10 is used for
discharging materials 12 onto a field 16 or open area to be
cultivated.
[0050] The apparatus 10 includes a power discharge means generally
designated 18 which is disposed adjacent to a discharge outlet 20
defined by a container 14. The arrangement is such that when the
apparatus 10 is being used to spread the materials 12 onto the open
area such as the field 16, the materials 12 move from the container
14 through the outlet 20 towards the power discharge means 18 for
discharge at a location such as location e,3 on the field 16 as
shown in FIG. 1.
[0051] A power means generally designated 22 is drivingly connected
to the power discharge means 18 for rotating the power discharge
means 18 as indicated by the arrow 19.
[0052] FIG. 3 is a side elevational view partially in section of
the power discharge means 18 shown in FIG. 2. As shown in FIG. 3 a
power sensing means generally designated 23 is provided for sensing
the power supplied by the power means 22 which is approximately the
same as the power used by the power discharge means 18. The power
sensing means 23 generates a first signal which is proportional to
the power supplied by the power means 22 which is correlated to the
amount of material discharged.
[0053] A control means generally designated 24 is connected to the
power sensing means 23 such that the first signal is fed into the
control means 24.
[0054] A means generally designated 28 which may be programmable is
connected to the control means 24, the means 28 generating a second
signal that is fed into the control means 24.
[0055] Also, the control means 24 includes a comparator circuit 25
for comparing the first and the second signals. The comparator
circuit 25 generates a third signal based on a comparison of the
first and second signals. The arrangement is such that the third
signal is used for variably controlling the particular rate at
which the materials 12 are discharged so that when the container 14
is moved across the field 16, the materials 12 are discharged.
[0056] As shown in FIGS. 2 and 3 the power discharge means 18
includes an axle 36 rotatably driven about a rotational axis 37 by
the power means 22.
[0057] Also, a plurality of arms 110, 111, 112 and 113 are
connected to the axle 36 as shown in FIG. 3. Each of the arms
110-113 has a first and a second end 114 and 116 respectively. Each
of the first ends 114 of the arms are secured in spaced
relationship along the axle 36, the arms 110-113 extending
outwardly away from the axle 36 so that on rotation of the axle 36
as indicated by the arrow 19, the arms 110-113 propel the materials
12 in a direction as indicated by the arrow 38 from the container
14 and through the power discharge means 18.
[0058] As shown in FIGS. 2 and 3, the axle 36 is disposed
horizontally.
[0059] FIG. 4 is a similar view to that shown in FIG. 2 but shows
another embodiment of the present invention, in which the axle 36a
is disposed substantially vertically.
[0060] FIG. 5 is a front end view of yet another embodiment of the
present invention. As shown in FIG. 5 a further axle 118b is
disposed parallel and spaced relative to the axle 36. Also, a
further plurality of arms 110b, 111b, 112b and 113b are connected
to the further axle 118b. Each of the further arms 110b-113b has a
first and a second end 114b and 116b respectively. Each of the
first ends 114b of the further arms 110b- 113b are secured in
spaced relationship along the further axle 118b, the further arms
110b- 113b extending outwardly away from the further axle 118b so
that on rotation of the further axle 118b, the further arms
110b-113b cooperate with the arms 110-113 to propel the materials
in a direction 38b from the container 14b and through the power
discharge means 18b.
[0061] As shown in FIG. 2, each of the second ends 116 of the arms
110-113 include a hammer 44.
[0062] As shown in FIG. 3, the power means 22 is a hydraulic
motor.
[0063] FIG. 6 is a similar view to that shown in FIG. 3. However,
FIG. 6 shows another embodiment of the present invention in which
the power means 22c is an electric motor.
[0064] Also, FIG. 7 is a similar view to that shown in FIG. 3.
However, FIG. 7 shows yet another embodiment of the present
invention, in which the power means 22d is a gas engine.
[0065] FIG. 8 is a schematic representation of the power discharge
apparatus concept according to the present invention.
[0066] As shown in FIG. 8, in the broadest aspect of the present
invention as indicated by the dashed box 1, the power means 22 is
connected to the power sensing means 23 which sends a first signal
which correlates to the spread rate of the power discharge means
18.
[0067] In another aspect of the present invention, as indicated by
the dashed box 2, a control means 24 is connected to the power
sensing means 23 for permitting control of the spread rate.
[0068] In yet another aspect of the present invention, as indicated
by the dashed box 3, a means 28 which may be programmable, is
connected to the control means 24, the means 28 sending a second
signal to the control means 24. A comparator circuit within the
control means 24 compares the first and second signal and generates
a third signal based on the comparison. The third signal is used
for adjusting the spread rate of the power discharge means 18 by
means of a discharge regulator apparatus 19.
[0069] As shown in FIG. 3, the apparatus 10 also includes a drive
belt 118 for drivingly connecting the power means 22 to the power
discharge means 18.
[0070] More specifically, the power sensing means 23 includes a
driving device generally designated 120 which extends from the
power means 22 to the power discharge means 18 for driving the
power discharge means 18. Furthermore, a pulley 122 cooperates with
the driving device 120 such that the pulley 122 bears against the
driving device 120.
[0071] A load cell 124 is disposed adjacent to the pulley 122 such
that as the pulley 122 bears against the driving device 120, the
load cell 124 senses a change in tension of the driving device 120.
The change in tension is proportional to the power supplied by the
power means 22 so that the load cell 124 generates the first signal
which is proportional to the power supplied by the power means
22.
[0072] As shown in FIG. 3, the driving device 120 is a belt drive
119. However, in another embodiment of the present invention as
shown in FIG. 7, the driving device 120 is a chain drive 121.
[0073] In one embodiment of the present invention as shown in FIG.
3, the control means 24 is an electronic control.
[0074] However, in the embodiment as shown in FIG. 7, the control
means 24d is a hydraulic control circuit.
[0075] The means 28 in one embodiment of the invention includes a
prerecorded memory which generates the second signal which is
unique to a soil analysis of the location such as e,3 on the field
16 as shown in FIG. 1.
[0076] A global positioning system 126 is provided for determining
when the power discharge means 18 is disposed over the location
such as e,3 on the field 16, the second signal being triggered when
the location such as e,3 on the field is determined by the global
positioning system 126 so that the materials 12 are discharged at
the particular rate at the location such as e,3 on the field.
[0077] More specifically, the prerecorded memory may be a magnetic
tape 128 or other means for storing information which is compiled
from data supplied from the soil analysis for a plurality of
locations such as e,3 and h,2 and other locations within the field
as shown in FIG. 1.
[0078] Also, the global positioning system 126 operates in
conjunction with source of information 128 such that when the
global positioning system 126 determines that the power discharge
means 18 is disposed in a vicinity of one of the locations such as
e,3 of the plurality of locations e,3, h,2, the source of
information 128 is operative to supply the second signal which is
unique to the one of the locations such as e,3 so that the second
signal is fed to the comparator circuit 25 for assisting in varying
the power discharge means 18 to correspond with the soil analysis
for the one location such as e,3 such that the particular rate of
discharge is achieved.
[0079] The first signal also is compared by the comparator circuit
25 so that if a consistency of the material 12 being discharged
varies, the comparator circuit 25 compares the first and second
signals and generates the third signal based on the comparison of
the first and second signals, the third signal controlling the rate
of discharge of the materials 12 so that such rate is commensurate
with the consistency of the material 12 and so that such rate
corresponds with the soil analysis for the one location such as
e,3.
[0080] More particularly, when manure is being spread on a field,
such manure may be in liquid, semi-liquid, slurry, semi-solid or
solid form. Such difference in consistency of the manure is known
in the art as the "material factor" or MF. When manure is being
spread, rotation of the power discharge means requires a different
power input from the drive means when spreading liquid manure as
compared to spreading a heavier manure. In the case of a liquid
manure, the tension in the drive belt could be more than when
spreading a solid material, depending on the amount being spread.
The tension would be related to the amount of material being
discharged. Hence, the tension of the drive belt measured by the
load cell is related to the discharge rate and type of the manure.
Accordingly, the rate of discharge can be varied in accordance with
the nutritional value of the particular consistency of manure being
spread.
[0081] The programmable means 28 in a preferred embodiment of the
present invention includes means for storing data corresponding to
information received from a survey of the field 16. It will also be
understood by those skilled in the art that manual means could be
used as an alternative arrangement instead of the programmable
means.
[0082] The survey includes a combined global positioning system 126
and soil analysis survey.
[0083] Such survey may include any or all of the following
information: Topography, moisture, soil type, crop yield,
fertility.
[0084] Also, it will be understood by those skilled in the art that
a LORAN type of system or an ACCUTRAK system is included in the
generic term GPS.
[0085] Also, in the present invention, the first signal from the
load cell can be used to alter the door opening of the power
discharge means so as to maintain a constant spread rate when the
revolutions per minute of the power means remains constant.
[0086] Additionally, the apparatus according to the present
invention senses what is discharged so that the first signal from
the sensor can be used to monitor the spread rate.
[0087] Furthermore, control of the spread rate is based on the
weight of the materials spread and in most applications, an
operator will know how much material can be spread on the field in
accordance with government regulations. The operator will also know
the category of material being spread. Accordingly, a constant
spread rate can be maintained by automatically adjusting the door
opening by means of a hydraulic drive or screw jack or any other
method of controlling the spread rate.
[0088] The present invention enables an operator to automatically
or manually vary the amount of fertilizer spread over different
parts of a field to optimize crop cultivation while minimizing
cost.
* * * * *