Note: Descriptions are shown in the official language in which they were submitted.
CA 02618442 2008-01-15
MANURE REMOVAL AND DRYING SYSTEM
FIELD OF THE INVENTION
This invention relates in general to a system for drying and removing manure
from
poultry or livestock houses. More particularly, the present invention concerns
the use of a
perforated belt manure removal and drying system.
BACKGROUND OF THE INVENTION
Operators of poultry or livestock houses, for obvious reasons, have a need to
remove
manure from the poultry or livestock houses. As a part of that removal,
operators have also
found it to be very beneficial to dry the manure as it is being removed for a
number of reasons,
including but not necessarily limited to, ease of handling, ease of storage,
reduction in weight
which make the dried manure more cost effective in shipping, disease/fly
control, ease of field
application/blend consistency, and very little nutrient content is lost by
drying, such that it creates
a more nutrient dense product relative to weight.
Current systems for the removal and drying of manure from poultry or livestock
houses
present many problems for the animal husbandry industry. For example, in a
typical poultry
house 22, as illustrated in FIG. 1, a manure removal and drying machine 21
along with a
permanently placed wall 28 separate a high pressure area or room 29 from a low
pressure area or
room 27. The manure removal and drying machine 21 has a plurality of levels of
perforated belts
or conveyors 24 along which the manure travels as it is dried and removed from
the poultry
house 22. Air flow (depicted by arrows facing to the left in FIG. 1) into the
high pressure room
29 caused by fans (not shown) running within the poultry house 22 causes
static pressure to
buildup in the high pressure room 29. The manure removal and drying machine 21
of the prior
art allows the air flow, forced by the static pressure within the high
pressure room 29, to flow
into and across the manure removal and drying machine 21, typically at every
other level of
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perforated belt 24. This air flow, however, is then forced to divert either
upwardly or
downwardly (FIG. 1 illustrates air flow both upwardly and downwardly, although
some prior art
manure removal and drying machines only allow air flow either upwardly or
downwardly),
through the perforations in the perforated belts 24, and out of the manure
removal and drying
machine 21 and into the low pressure room 27.
Such a configuration, however, does not allow for efficient operation of the
entire manure
removal and drying system as there is an excessive buildup of static pressure
in the poultry house
22. The manure removal and drying machine 21 is only designed to allow for a
small amount of
air and static pressure to move therethrough from the high pressure room 29 to
the low pressure
room 27, i.e., for minimum ventilation of the poultry house 22. When more fans
are running
within the poultry house 22, extra static pressure is generated and builds up
in the high pressure
room 29, but this is static pressure that the manure removal and drying
machine 21 does not
need, thus resulting in possible inefficient operation of the manure removal
and drying machine
21.
Also, typical manure removal and drying systems use a manual stop and start
control (full
speed or nothing), which requires constant attention from an operator, and
causes inconsistent
loading of the dryer system.
Further, typical manure removal and drying systems have a plurality of manure
belts
which are staggered relative to one another in a vertical arrangement. More
specifically, material
or manure traveling along a first manure belt in a first direction will be
dropped onto a second
manure belt traveling in a second direction. The manure is then dropped onto a
third manure belt
traveling in the same direction as the first belt, and then the manure is
dropped onto a fourth belt
traveling in the same direction as the second belt, and so on and so forth for
as many manure
belts are provided in the manure removal and drying system. Such a
configuration wastes time
and energy, however, as the entire operating capacity of the manure and
removal drying system is
not needed when the amount of manure is minimal. Furthermore, when maintenance
is required
on one or more of the conveyor belts, the entire system must be shut down in
order to perform
the maintenance.
Also, the belts 24 of the manure removal and drying machine and system are
typically
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63632-1684
supported by a fixed member, such as a support tube or any other structural
and/or functional
equivalent thereof. Because these members are fixed, a large amount of
friction is generated by
the belts 24 moving over the fixed members, thus limiting the length at which
the belts 24 can
operate. Currently, it is believed that most belts 24 in manure removal and
drying
machines/systems are limited to a length of approximately 260 feet. It would
be desirable to
increase the length of the belts 24 for a variety of reasons, including but
not limited to, the
possible removal of levels of belts 24 in the manure removal and drying
machine 21 and the
ability to lengthen the drying time of the manure within the manure removal
and drying machine
21.
These and other drawbacks are solved by the present invention.
SUMMARY OF THE INVENTION
Briefly, and in accordance with the foregoing, some embodiments of the
invention provide a
manure removal and drying system for use in an agricultural setting such as a
poultry or livestock house.
The manure removal and drying system includes a manure removal and drying
machine, which is
preferably made up of a plurality of continuous conveyor belts which are
staggered relative to
one another in a vertical arrangement. The manure removal and drying system
also includes an
actuator configured to activate and/or deactivate the conveyor belts as well
as vary the speed of
the conveyor belts. The actuator is in communication with a controller that
instructs the actuator
to activate and/or deactivate the conveyor belts as well as vary the speed of
the conveyor belts
based upon preprogrammed levels of the amount of manure on the conveyor belts
as well as
preprogrammed levels of moisture within the manure.
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In some embodiments, a moisture sensor configured to sense the level
of moisture in the manure is operatively associated with one or more of the
conveyor
belts of the manure removal and drying machine and in communication with the
controller. When the moisture sensor communicates to the controller a level of
moisture in the manure equal to or greater than the preprogrammed moisture
level in
the controller, the controller instructs the actuator to activate the conveyor
belts.
Likewise, when the moisture sensor communicates a level of moisture below the
preprogrammed level of moisture in the controller, the controller instructs
the actuator
to deactivate the conveyor belts.
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Furthermore, the controller may have a plurality of preprogrammed moisture
levels that when
reached, the controller will instruct the actuator to vary the speed of the
conveyor belts rather
than simply activate or deactivate the conveyor belts.
Similarly, a material position sensor configured to sense the amount of manure
on one or
more of the conveyor belts is operatively associated with the conveyor belts
and is in
communication with the controller. When the material position sensor
communicates to the
controller a specified amount of manure on the conveyor belts, the controller
instructs the
actuator to increase or decrease the speed of the conveyor belts based upon
the preprogrammed
amounts of manure in the controller.
The plurality of staggered conveyor belts of the manure removal and drying
machine are
scalable. For example, a first conveyor belt is positioned above a second
conveyor belt, which is
in turn positioned above a third conveyor belt, which is then in turn
positioned above a fourth
conveyor belt. The ends of the first and third conveyor belts are generally
coplanar, and the ends
of the second and fourth conveyor belts are generally coplanar, but the ends
of the first and third
conveyor belts are offset from the ends of the second and fourth conveyor
belts. Also, the first
and third conveyor belts move in a same direction, and the second and third
conveyor belts move
in a same direction that is opposite the direction of the first and third
conveyor belts. Thus,
manure will travel along the first conveyor belt and be dropped onto the
second conveyor belt,
then travel along the second conveyor belt and be dropped onto the third
conveyor belt, then
travel along the third conveyor belt and be dropped onto the fourth conveyor
belt. However,
when deemed appropriate or necessary, the second conveyor belt can be moved
out of a co-planar
relationship with the fourth conveyor belt, and into a co-planar relationship
with the first and
third conveyor belts. Thus, manure traveling along the first conveyor belt
will be dropped to the
fourth conveyor belt effectively bypassing both the second and third conveyor
belts.
Furthermore, the static pressure generated by the manure removal and drying
system is
controlled by a static pressure control system. The manure removal and drying
machine along
with a portion of static pressure control system separate a high pressure area
from a low pressure
area. The static pressure control system includes a pressure bypass door
between the high
pressure and low pressure areas that is configured to open such that the high
pressure area is in
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CA 02618442 2013-05-07
63632-1684
communication with the low pressure area in order to reduce the pressure in
the high pressure
area. The bypass door is opened and closed by a bypass actuator. The static
pressure control
system further includes a static pressure sensor positioned within the high
pressure area. The
static pressure sensor is in communication with a bypass controller that is in
turn in
communication with the bypass actuator. The bypass controller is programmed
with at least
one predetermined level of static pressure. Thus when the bypass controller
receives input
from the static pressure sensor indicating a level of static pressure in the
high pressure area
equal to or greater than the programmed level of static pressure in the bypass
controller, the
bypass controller instructs the bypass actuator to open the bypass door.
The length of the perforated belts/conveyors of a manure removal and drying
machine is also greatly increased over those of the prior art by incorporating
a friction
reduction system within the manure removal and drying machine. The friction
reduction
system includes a tube member or the like that is sized to fit over and around
the tube or
member that is fixedly secured in place to support the belts along their
length. The tube
member is preferably round, larger than the support member, and is rotatable
about the
support member such that as the perforated belt moves along the tube member,
the tube
member will roll or move around the support member, thereby reducing the
amount of friction
generated between the perforated belts and the support member. This reduction
in friction
allows for the length of the perforated belts to be substantially increased.
According to one aspect of the present invention, there is provided a manure
removal and drying system comprising: a friction reduction system including
first and second
members and a conveyor, the first member having a predetermined length and an
axis, the
first member being fixed in position and being non-movable, the second member
having a
predetermined length and an axis, the second member being positioned around
the first
member and being movable about the first member, the conveyor configured to
move in a
direction which is transverse to the lengths of the first and second members,
the conveyor
being in contact with the second member such that movement of the conveyor
causes the
second member to move about the first member.
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63632-1684
BRIEF DESCRIPTION OF THE DRAWINGS
The features of the invention which are believed to be novel are described in
detail hereinbelow. The organization and manner of the structure and operation
of the
invention, together with further objects and advantages thereof, may best be
understood by
reference to the following description taken in connection with the
accompanying drawings
wherein like reference numerals identify like elements in which:
FIG. 1 is a side view of an interior of a typical prior art poultry house in
which
a manure removal and drying machine along with a permanently placed wall
separate a high
pressure room from a low pressure room;
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CA 02618442 2008-01-15
FIG. 2 is a side view of an interior of a poultry house incorporating various
systems of a
manure removal and drying system of the present invention, with a pressure
bypass of a static
pressure control system being in a closed position;
FIG. 3 is a side view of an interior of a poultry house depicted in FIG. 2,
but with the
pressure bypass being in an open position;
FIGS. 4 and 5 are side views of an interior of a poultry house incorporating
an alternative
embodiment of the pressure bypass being in both a closed position (FIG. 4) and
an open position
(FIG. 5);
FIG. 6 is a side view of an interior of a poultry house incorporating another
alternative
embodiment of the pressure bypass;
FIG. 7 is a side view of a portion of a selective capacity control system of
the manure
removal and drying system of the present invention;
FIG. 8 is a side view of a portion of the selective capacity control system
showing one of
multiple levels of conveyors moved out of alignment with the other levels such
that it can be
bypassed during operation of the manure removal and drying system;
FIG. 9 is a flow chart illustrating a portion of the static pressure control
system;
FIG. 10 is a flow chart illustrating a portion of a moisture sensing control
system of the
manure removal and drying system of the present invention;
FIG. 11 is a side view of another portion of the moisture sensing control
system;
FIG. 12 is a flow chart illustrating a portion of an automatic variable speed
loading
system of the manure removal and drying system of the present invention;
FIG. 13 is side view of another portion of the automatic variable speed
loading system;
and
FIG. 14 is a side view of a friction reduction system of the manure removal
and drying
system of the present invention.
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CA 02618442 2008-01-15
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS
While this invention may be susceptible to embodiment in different forms,
there is shown
in the drawings and will be described herein in detail, specific embodiments
with the
understanding that the present disclosure is to be considered an
exemplification of the principles
of the invention, and is not intended to limit the invention to that as
illustrated.
Turning now to the drawings, the illustrated manure removal and drying system
20
desirably is adapted to be used in connection with a livestock or poultry
house 22 as shown in
FIGS. 2-14. As illustrated in FIGS. 2-8, the manure removal and drying system
20 has a manure
removal and drying machine 23 which includes a plurality of manure conveyors
24, which are
preferably continuous perforated belts which are staggered relative to one
another in a vertical
arrangement. More specifically, a first manure belt 24a is positioned above a
third manure belt
24c with the ends 26a, 26c of the first and third manure belts 24a, 24c being
generally co-planar,
a second manure belt 24b is positioned above a fourth manure belt 24d with the
ends 26b, 26d of
the second and fourth manure belts 24b, 24d being generally co-planar, but the
ends 26a, 26c are
not generally co-planar with the ends 26b, 26d, but rather are offset from one
another. The
second manure belt 24b is vertically positioned between the first and third
manure belts 24a, 24c
and the third manure belt 24c is vertically positioned between the second and
fourth manure belts
24b, 24d. Also, the first and third manure belts 24a, 24c generally move in
the same direction,
whereas the second and fourth manure belts 24b, 24d generally move in the
opposite direction.
Thus, material or manure traveling along the first manure belt 24a will be
dropped onto the
second manure belt 24b, which in turn will be dropped onto the third manure
belt 24c, which in
turn will be dropped onto the fourth manure belt 24d, and so on and so fourth
for as many
manure belts 24 are provided in the manure removal and drying system 20, as it
is to be
understood that the manure removal and drying machine 23 may have more than
four manure
belts 24.
The manure removal and drying machine 23 includes a selective capacity control
system
25 that provides for at least one of the manure belts 24, for instance the
second manure belt 24b,
to be configured to be moved such that the end 26b of the second manure belt
24b be moved out
of co-planar relation with the end 26d of the fourth manure belt 24d and into
co-planar relation
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CA 02618442 2008-01-15
with the ends 26a, 26c of the first and third manure belts 24a, 24c. Thus, the
second and third
manure belts 24b, 24c are effectively bypassed such that manure traveling on
the first manure
belt 24a will be dropped onto the fourth manure belt 24d.
This selective capacity control system 25 of the manure removal and drying
system 20
allows the whole manure and removal drying machine 23 to be scaled to the
desired moisture
content and drying time. The selective capacity control system 25 of the
manure removal and
drying system 20 also allows the operator to perform service on some of the
manure belts 24, for
instance the second and third manure belts 24b, 24c as they need not be
running during bypass
operation, yet still run the rest of the manure belts 24. Thus, levels of the
manure removal and
drying machine 23 are skipped two at a time, shrinking the operating capacity
of the manure
removal and drying system 20.
Preferably, the manure removal and drying system 20 includes a static pressure
control
system 30, a moisture sensing control system 50, an automatic variable speed
loading system 70,
and a friction reduction system 90.
The static pressure control system 30, as depicted in FIG. 9, allows the
manure removal
and drying system 20 to operate somewhat independently of the typical building
ventilation,
including the minimal ventilation through the manure removal and drying
machine 23, such as
that described in the prior art with regard to the manure removal and drying
machine 21. The
static pressure control system 30 includes a controller 32, a static pressure
sensor 34, a pressure
bypass actuator 36 and a pressure bypass 38. As shown in FIG. 1-6, manure
removal and drying
machines 21, 23 of the prior art and of the present invention are typically in
a low pressure
area/room 27 of a poultry house 22. The manure removal and drying machine 23
separates the
low pressure area/room 27 from a high pressure area/room 29. As previously
discussed, prior art
arrangements include a permanently placed wall 28 that further separates the
low pressure
area/room 27 from the high pressure area/room 29.
The static pressure control system 30 allows for a more efficient operation of
fans within
the poultry house 22 by limiting the buildup of static pressure. The static
pressure control system
further allows for adjustment of manure moisture without changing building
ventilation
controls. The static pressure control system 30 of the manure removal and
drying system 20 also
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CA 02618442 2008-01-15
allows operators to compensate for seasons and weather.
As best illustrated in FIGS. 2-6, the pressure bypass 38 of the static
pressure control
system 30 of the manure removal and drying system 20 replaces the permanently
placed wall 28
in prior art arrangements. The static pressure sensor 34 is positioned in the
high pressure
area/room 29 and is in communication with the controller 32. The controller 32
controls the
pressure bypass actuator 36 which, in turn, is operatively associated with the
pressure bypass 38.
The controller 32 may dictate that the pressure bypass 38 be in a closed
position, as illustrated in
FIGS. 2 and 4, such that the pressure bypass 38 acts like the permanently
placed wall 28.
Conversely, the controller 32 may dictate that the pressure bypass 38 be in an
open position, as
illustrated in FIGS. 3 and 5, such that the high pressure area/room 29 be in
communication with
the low pressure area/room 27, in order to reduce the pressure in the high
pressure area/room 29.
The controller 32 is configured to have an operator input one or more pressure
levels/limits at
which, based on the sensing of the static pressure by the static pressure
sensor 34 within the high
pressure area/room 29, the controller 32 dictates the opening/closing of the
pressure bypass 38.
For instance, at a first pressure level/limit, the controller 32 is programmed
to dictate that the
pressure bypass 38 be closed. At a second pressure level/limit higher than the
first pressure
level/limit, the controller is programmed to dictate that the pressure bypass
38 be opened to a
certain degree of openness. It is understood that the controller 32 may be
programmed with more
than two pressure levels/limits at which the controller 32 dictates that the
pressure bypass 38 be
opened to different degrees of openness.
The pressure bypass 38 may be in the form of a partition configured to open
and close as
shown in FIGS. 2 & 3, or as a door within a partition that is configured to
open and close as
shown in FIGS. 4 & 5. It is also contemplated that the pressure bypass 38 can
be a valve that can
open and close to allow communication between the high pressure area/room 29
and the low
pressure area/room 27, as generally shown in FIG. 6.
The moisture sensing control system 50 of the manure removal and drying system
20, as
depicted in FIGS. 10 & 11, .includes a controller 52. In the present
illustrated embodiment, the
controller 52 of the moisture sensing control system 50 is described and
illustrated as being
separate from the controller 32 of the static pressure control system 30, but
it is to be understood
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CA 02618442 2008-01-15
that a single controller may be used for both systems 30, 50. The moisture
sensing control
system 50 also includes a manure moisture sensor 54, a safety sensor 56, and a
manure belt
actuator 58. The manure moisture sensor 54 and the safety sensor 56 are in
communication with
the controller 52. The controller 52 controls the manure belt actuator 58
which, in turn, is
operatively associated with a manure belt 24 in order to activate or
deactivate the manure belt 24.
The controller 52 dictates when the manure belt 24 runs and how long the
manure belt 24 runs.
The manure moisture sensor 54 is associated with the manure belt 24 in order
to sense the
moisture of the manure on the manure belt 24. The controller 52 is configured
to have an
operator input one or more desired moisture levels at which, based on the
sensing of moisture by
the manure moisture sensor 54, the controller 52 dictates the running of the
manure belt 24. The
safety sensor 56 is associated with the manure belt 24 in order to sense any
malfunction in the
manure belt 24. If a malfunction is sensed by the safety sensor 56, the
controller 52 stops the
manure belt 24 regardless of the level of moisture of manure on the manure
belt 24. It is to be
understood that the manure belt 24 of the moisture sensing control system 50
is the same as the
manure belts 24 illustrated in FIGS. 7 & 8.
The moisture sensing control system 50 is a labor saving device. The moisture
sensing
control system 50 allows manure belts 24 to automatically move based on the
moisture level of
the manure. The moisture sensing control system 50 also will allow manure
removal and drying
systems 20 to operate at peak efficiency, with operators specifying moisture
content.
As illustrated in FIGS. 12 & 13, an automatic variable speed loading system 70
of the
manure removal and drying system 20 includes a manure belt controller 72.
Again, in the present
illustrated embodiment, the manure belt controller 72 of the variable speed
loading system 70 is
described and illustrated as being separate from the controller 32 of the
static pressure control
system 30, and the controller 52 of the moisture sensing control system 50,
but it is to be
understood that a single controller may be used for all three systems 30, 50,
70. The automatic
variable speed loading system 70 also includes a material position sensor 74,
a safety sensor 76, a
variable speed motor drive control 78, and a flapper member 80. The material
position sensor 74
and the safety sensor 76 are in communication with the manure belt controller
72. The safety
sensor 76 is associated with the manure belt 24 in order to sense any
malfunction in the manure
CA 02618442 2008-01-15
belt 24. If a malfunction is sensed by the safety sensor 76, the controller 72
stops the manure belt
24 regardless of the amount of manure on the manure belt 24. The safety sensor
76 is described
and illustrated as being separate from the safety sensor 56, but it is to be
understood that a single
safety sensor may be used for both systems 50, 70. The manure belt controller
72 controls the
variable speed motor drive control 78 which, in turn, is connected to the
manure belt 24 in order
to control the speed at which the manure belt 24 runs. The flapper member 80
is positioned
above the manure belt 24 at an initial angle and is configured to pivot about
a fulcrum point 82.
The material position sensor 74 is associated with the flapper member 80 and
senses an angle or
movement of the flapper member 80 relative to the manure belt 24. During
operation, the
manure will be transported along the manure belt 24 and will come into contact
with the flapper
member 80. Depending on the amount or volume of the manure traveling along the
manure belt
24, the flapper member 80 will pivot about the fulcrum point 82 and the manure
position sensor
74 will sense the movement and relay this information to the manure belt
controller 72. The
larger the volume of manure sensed by the manure position sensor 74, the
faster the manure belt
controller 72 and the variable speed motor drive controller 78 will dictate
that the manure belt 24
be moved. Likewise, the smaller the volume of manure sensed by the manure
position sensor 74,
the slower the manure belt controller 72 and the variable speed motor drive
controller 78 will
dictate that the manure belt 24 be moved. Thus, the manure belt 24 is
preferably always running,
but can, of course, be stopped if desired.
The automatic variable speed loading system 70 allows for more consistent,
rapid loading
of a manure removal and drying system 20. Current systems use a stop and start
control (full
speed or nothing), but the automatic variable speed loading system 70 allows
for consistent flow
of material by changing speed based on the amount of the material being moved
on the manure
belt.
The friction reduction system 90, depicted in FIG. 14, provides for a
reduction in the
amount of friction between the perforated belts 24 and members 92 which
support the perforated
belts 24 and over which the perforated belts 24 travel. The members 92 are
fixedly positioned
within the manure removal and drying machine 23 such that the perforated belts
24 sit on top
thereof and travel across same. As the members 92 are fixed in position, there
is a substantial
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CA 02618442 2008-01-15
amount of friction between the belts 24 and the members 92. The members 92 may
be of any
configuration, but are illustrated as a tube-like member in FIG. 14 that is
preferably made of
metal. It is to be understood that other members 92 that are generally
equivalent either
structurally and/or functionally may also be used.
The friction reduction system 90 of the present invention incorporates the use
of a
separate member 94 that is positioned around the members 92, in a non-fixed
manner, such that
the member 94 is allowed to move relative to the member 92 as the belt 24 is
moved over the
member 94. In a preferred embodiment, as illustrated in FIG. 14, the member 94
is a tube-like
member that is preferably made of plastic, that is positioned around the tube-
like member 92,
with the member 94 having a larger internal diameter than an outside diameter
of the member 92.
As such, when the belt 24 is moved over the member 94, the member 94 is
allowed to rotate or
roll about the member 92. Because the member 94 is provided between the belt
24 and the
member 92, the amount of friction between the belt 24 and the member 94 and
between the
member 94 and the member 92 is substantially less than that directly between
the belt 24 and the
member 92. As such, the provision of the member 94 allows for the belts 24 of
the manure
removal and drying machine 23 to have a length which is substantially longer
than those that are
presently used in prior art manure removal and drying machines 21. Prior art
manure removal
and drying machines 21 are known to have a maximum length of approximately 260
feet,
whereas the manure removal and drying machine 23 having the friction reduction
system 90
incorporated therein can have lengths of at least 375 feet, which allows for a
more cost effective
configuration of the manure removal drying machine 23 and, thus, the manure
removal and
drying system 20.
The selective capacity control system 25, the static pressure control system
30, the
moisture sensing control system 50, the automatic variable speed loading
system 70, and the
friction reduction system 90 of the manure removal and drying system 20 are
described and
illustrated herein as being independent of one another, but it is to be
understood that each of the
selective capacity control system 25, the static pressure control system 30,
the moisture sensing
control system 50, the automatic variable speed loading system 70, and the
friction reduction
system 90 of the manure removal and drying system 20 can be operatively
associated with one
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63632-16b4 CA 02618442 2013-05-07
another such that the activation and operation of one system affects the
activation and operation
of another system. As discussed previously, the controllers 32, 52, 72 of the
static pressure
control system 30, the moisture sensing control system 50 and the automatic
variable speed
loading system 70 can be one single controller configured to perform the
desired operations of
each of the systems 30, 50, 70. By way of example, the level of static
pressure sensed by the
static pressure sensor 34 of the static pressure control system 30 and
conveyed to the controller
32, which can also be the manure belt controller 72 of the automatic variable
speed loading
system 70, can dictate at what speed the variable speed motor drive 78 drives
the manure belts 24
regardless of the amount of manure sensed by the manure position sensor 74.
Likewise, the
actions of the selective capacity control system 25 and the moisture sensing
control system 50
may be affected by the static pressure control system 30, and vice versa.
Also, the friction
reduction system 90 can be incorporated into the manure removal and drying
machine 23
regardless of whether the manure removal and drying machine 23 has none, one
or more of the
systems 25, 30, 50, 70.
While preferred embodiments of the invention are shown and described, it is
envisioned
that those skilled in the art may devise various modifications without
departing from the
scope of the foregoing description and the appended claims.
13
