Agitating – Mortar mixer type – Gravity type
Reexamination Certificate
2000-11-03
2002-03-05
Soohoo, Tony G. (Department: 1723)
Agitating
Mortar mixer type
Gravity type
C366S017000, C366S018000, C366S029000, C366S031000
Reexamination Certificate
active
06352360
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a continuous mixing plant, and more particularly to a continuous mixing plant that is suitable for continuously producing concrete for a short period of time simply by, for example, continuously feeding necessary material while measuring it and dropping the material by gravitational force.
BACKGROUND ART
Conventionally, a batcher plant that is an apparatus for producing concrete is equipment for mixing cement, water, sand, rough sand, mixer agent and the like for the material of the concrete measured in a predetermined composition for producing the concrete that is kept in non-solid condition, and has been widely used in a dam construction, a civil construction, a green concrete factory, a concrete secondary factory or the like.
The conventional batcher plant is roughly composed of a material reservoir portion, a metering portion, a kneading portion and a loading portion. The batcher plants are divided into various types in accordance with these arrangements. The most typical system is of a tower type as shown in FIG.
11
. The conventional tower type batcher plant
1
shown in
FIG. 11
is a system in which a receiving chamber
2
, a material reservoir
3
(a cement reservoir
3
a,
a sand reservoir
3
b,
a small stone reservoir
3
c,
a water reservoir
3
d
), a metering portion
4
(a cement metering tank
4
a,
a sand metering tank
4
b,
a small stone metering tank
4
c
), a concrete mixer
5
, a concrete hopper
6
and the like are overlapped in order in a tower-like shape from above. A type in which an operating chamber
7
projects from a metering or mixer chamber
8
and a type in which an operating chamber
7
is separated from the plant are popular.
Thus, almost all of the conventional batcher plants including that shown in
FIG. 11
are of a batch processing type (the process in which a predetermined amount of materials is mixed and agitated every time, and this is repeated). Then, one for metering and agitating the materials for every turn is called a batch mixer.
However, in such a batch process, the manufacture of concrete is intermittent and such a process is not so effective for continuously producing a large amount of concrete. For this reason, in the conventional tower type batcher plant
1
as shown in
FIG. 11
, two concrete mixers
5
are arranged within the mixer chamber
8
, and these are alternately used in order to keep the continuation or continuity of the concrete manufacture as much as possible.
Even in a batch process, if the plurality of concrete mixers
5
are arranged as described above and are used in order, it is possible to keep continuous manufacture to some extent. However, there is a problem that the more the number of the installed mixers
5
, the larger the equipment of the batcher plant as a whole will become.
By the way, it is desired to continuously perform the manufacture of concrete in this manner. It is however very difficult to continuously mix the materials in an optimal manner. Actually, a mixing apparatus, i.e., a mixer that is actually usable effectively has not yet been realized. Also, even if such a continuous mixer is developed, there is a problem as to how the amount of each material to be continuously introduced into the mixer is metered for manufacturing a high quality concrete. Also in view of this point, it is considered impossible to perform the effective continuous manufacture of concrete.
In order to overcome the above-described problems inherent in the prior art, an object of the present invention is to provide a continuous mixing plant that, for example, simply continuously feeds the necessary materials while metering the amount thereof and drops these materials by gravitational force so that the mixed material may be manufactured continuously for a short period of time suitably, and in the case where the mixed material is concrete, it is possible to manufacture higher quality concrete continuously for a short period of time while accurately continuously metering each material and feeding it to the mixer.
DISCLOSURE OF THE INVENTION
The present invention relates to a continuous mixing plant. In order to solve the above-described problems, the invention is constituted as follows. Namely, according to the present invention, there is provided a continuous metering and feeding means for keeping on feeding at least two kinds of materials to be mixed with each other while continuously metering the materials, the number of the continuous metering and feeding means being the number corresponding to the materials, and at least one mixing box unit for mixing the materials fed continuously from the continuous metering and feeding means, characterized in that the mixing box unit is provided with: a plurality of modified passages each of which has an inlet at one end and an outlet at the other end, a cross-sectional shape of which is continuously changed from the inlet toward the outlet and which extend in an axial direction; and a merging and dividing means provided between the inlet and the outlet of each of the modified passages for merging and dividing each material passing through each of the modified passages, and each material is continuously cast from the inlet portion and passed toward the outlet portion through each of the modified passages by the gravitational force to be mixed.
In the continuous mixing plant according to the present invention, it is preferable that the plant further comprises a metering means for metering a delivery amount locally and for every predetermined time in a midway for continuously delivering the material fed from each of the continuous metering and feeding means, and the continuous metering and feeding means receives a signal from this metering means to be feedback-controlled, thereby enhancing precision of the material supply amount.
In such a continuous mixing plant, at least two materials to be mixed are an aggregate and mortar, or cement paste, and the mixing plant is applied as a plant for continuously manufacturing concrete.
A continuous mixing plant according to the present invention may further take the following structure. Namely, there is provided a continuous mixing plant comprising a main belt conveyor unit for delivering aggregate; a continuous aggregate feeding means for keeping on feeding at least one kind of aggregate to the main belt conveyor unit while metering the material; a first detecting unit installed downstream of a delivery belt of the main belt conveyor unit for metering continuously at a predetermined position a local amount of the aggregate that has been transferred on the delivery belt of the main belt conveyor unit, thereby outputting a signal; a continuous fixed amount supply means installed downstream of the main belt conveyor unit having the aggregate fed for keeping on feeding a fixed amount of mortar or cement paste continuously to the main belt conveyor unit; and at least one mixing box unit disposed just below a delivery end of the main belt conveyor unit, characterized in that the continuous fixed amount supply unit receives the signal continuously output from the first detecting unit and is feedback-controlled to enhance precision of the supply amount of the mortar or cement paste, and that, furthermore the mixing box unit is provided with: a plurality of modified passages each of which has an inlet portion at one end and an outlet portion at the other end, a cross-sectional shape of which is continuously changed from the inlet portion toward the outlet portion, and which extend in an axial direction; and a merging and dividing means provided between the inlet portion and the outlet portion of each of the modified passages for merging and dividing concrete passing through each of the modified passages and concrete is cast from the inlet portion and passed toward the outlet portion through each of the modified passages by the gravitational force to be mixed.
Although the continuous mixing plant according to the present invention comprises the above-described necessary structural elements, it is pos
Burr & Brown
Japan Institute of Construction Engineering
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