Classifying – separating – and assorting solids – Plural – diverse separating operations – Gaseous suspension and sifting
Reexamination Certificate
1999-07-28
2003-06-24
Nguyen, Tuan N. (Department: 3653)
Classifying, separating, and assorting solids
Plural, diverse separating operations
Gaseous suspension and sifting
C055S304000, C055S380000, C055S484000, C055SDIG001
Reexamination Certificate
active
06581778
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a powder receiving device for receiving various types of powder transported from a truck or the like. More specifically, the present invention relates to a powder receiving device for receiving granular and/or powdered food products, feed, chemical products, and pharmaceutical products.
Powder is conventionally stored and shipped in bags or plastic containers. Alternatively, powder may be bulk shipped using a transport device such as a dump truck or a dump semi-trailer having a container with an upper section that can be opened and closed. Powder shipped in this manner arrives at a destination plant where the powder is transported with a powder air transport system installed in the plant. The powder is received by a powder receiving device (receiver) and is then stored in a silo.
Referring to
FIGS. 1 and 2
, a conventional system is shown for air transporting a powder from a dump truck
100
into a silo
108
. Dump truck
100
, arriving at a plant
101
, backs into a loading area
102
. A receiving hood
103
, installed in loading area
102
, has a powder loading opening
103
a
formed on a side surface. Dump truck
100
backs toward powder loading opening
103
a
. A container
100
a
is lifted and powder is loaded into receiving hood
103
from a rear door
100
b
. The bottom of receiving hood
103
forms a hopper-style powder outlet opening
103
b
. A chain conveyor
104
connects at a lower region of powder outlet opening
103
b
to provide lateral transfer of powder.
Powder loaded into powder loading opening
103
a
drops from powder outlet opening
103
b
through a powder feeding opening
104
a
of chain conveyer
104
. Powder laterally transferred by chain conveyor
104
is released through a powder transfer opening
104
b.
A loading hopper
105
a
, attached at a lower region of powder transfer opening
104
b
, transfers the powder vertically into a bulk conveyor
105
. Powder dropped through powder transfer opening
104
b
is transferred upward by bulk conveyor
105
. When powder reaches an uppermost section
105
b
of bulk conveyor
105
, powder drops through a powder supplying duct
105
c.
Powder supplying duct
105
c
connects to a powder supply opening
106
a
.
The powder, laterally transferred by a chain conveyor
106
, drops into a powder transfer opening
106
b
. A connecting pipe
107
connects powder transfer opening
106
b
to a ceiling
108
a
of silo
108
. Powder stored inside silo
108
is fed through an outlet gate
109
at the bottom of a hopper
108
b
into a supply pipeline (not shown in the figure).
In the conventional powder supply system described above, a considerable amount of powder escapes when the powder is loaded in bulk into receiver hood
103
. Powder blown out from powder loading opening
103
a
enters back into container
100
a
of dump truck
100
, making dump truck
100
dirty. In addition, the escaping powder aggravates the work environment around loading area
102
, requiring frequent cleaning of loading area
102
.
A dust collector
110
is attached at an upper floor of plant
101
. A suction pipe
111
connects the inside of receiver hood
103
with dust collector
110
. Powder returns to silo
108
from an outlet side of dust collector
110
through a circulation pipe
112
. A suction fan
113
, disposed on an upper surface of dust collector
110
, takes air in through dust collector
110
and lets the air out through an outlet pipe
114
attached to a vent opening
115
of plant
101
. This conventional system restricts the escape of powder to some degree.
However, since dust collector
110
is installed at a high position, extra space is required. Also, since outside air enters receiver hood
103
, the internal suction power (pressure distribution) is uneven, resulting in stagnation of air and preventing efficient dust collection. Furthermore, powder retrieved in dust collector
110
must be returned to a supply line of silo
108
, allowing residual powder inside circulation pipe
112
to decompose. If dust collector
110
is used, different powders from other sources can become mixed with the desired powder, thus decreasing product value.
OBJECTS AND SUMMARY OF THE INVENTION
It is a first object of the present invention to provide a powder receiving device which results in a clean workplace where the escape and flying up of powder in a loading section is minimized.
It is a second object of the present invention is to provide a powder receiving device which prevents unevenness of pressure during dust collection, thus allowing dust to be efficiently collected.
It is a third object of the present invention is to provide a powder receiving device which prevents pressure loss in the duct piping and prevents contamination inside the duct piping.
It is a fourth object of the present invention is to provide a powder receiving device which uses an air blower that requires low suction power in the dust collector.
It is a fifth object of the present invention to provide a powder receiving device which substantially prevents noise from the dust collector.
Briefly stated, the present invention provides a powder receiving device having a loading chamber with an integral dust collector. The dust collector preferably includes at least one bag filter which filters air taken from above powder loaded into the loading chamber. The filtered air is then fed either back into the loading chamber, into a hopper where the powder is released to an external location, or out over the container from which the powder is loaded. This air flow provides for increased fluidity of the powder. The bag filter is positioned facing the loading chamber, such that when a backwash mean sends a pulse of air into the bag filter, the collected powder is dropped back into the loading chamber. The resulting powder receiving device prevents powder from escaping when powder is transferred from a container into the loading chamber. Since the powder is prevented from escaping, the powder receiving device further provides a clean workplace.
According to an embodiment of the present invention, there is provided a powder receiving device for receiving powder comprising a housing, a loading chamber within the housing for receiving the powder, a powder loading hopper attached at a bottom of the housing to direct powder from the loading chamber to an external location, a blower, the blower moving air on an air path originating inside the loading chamber, at least one bag filter in the housing in the air path, the bag filter being effective for filtering particles of the powder in the air path, and the at least one bag filter being positioned to permit the particles to fall into the powder loading hopper upon release from the bag filter.
According to another embodiment of the present invention, there is provided an integrated powder receiving device comprising a housing, a powder loading chamber in the housing, a powder loading hopper attached at a bottom of the powder loading chamber to receive powder from the housing and to direct powder to an external location, a fan drawing air from the powder loading hopper into an air path, at least one bag filter in the air path, the bag filter being of a type effective for filtering airborne particles of the powder from the air path, and the air path directed to at least one high location and one low location in the housing.
According to a further embodiment of the present invention, there is provided a powder receiving device comprising a loading chamber for conveying powder to a hopper therebelow, a blower drawing air on an air path from the loading chamber, a first air outlet from the air path, the first air outlet being close to the hopper, thereby increasing a fluidity of the powder in the hopper, whereby a flow of the powder through the hopper is improved, and a second air outlet high in the loading chamber for producing a downward flow of air toward the hopper, whereby the powder is preferentially directed toward the hopper.
The invention provides a powder receiving device whe
Kamimura Shinsaku
Kato Fumio
Darby & Darby
Nguyen Tuan N.
Tsukasa Industry Co., Ltd.
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