JP3122114B2 - Mixer for mixing bulk materials with a large difference in specific gravity - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixer for mixing a massive substance having a remarkable difference in specific gravity, and in particular, to a lightweight and stabilized soil (Satbilized Lig).
ht Soil (hereinafter abbreviated as SLS). The present invention relates to a mixer for rapidly pulverizing and mixing a large amount of civil engineering materials in advance without using a crushing device.

SLS is true specific gravity 2.3-2.8 gf / cm ³ , bulk specific gravity 1.3-1.9 gf / cm
⁽³ ) Soil, coal ash, refuse incineration ash, slag, etc. and bulk specific gravity 0.0
A civil engineering material made by mixing particles (diameter 1 to 30 mm) such as 1 to 0.03 gf / cm ³ of extremely light styrene foam to reduce the weight and adding a small amount of cement and lime to adjust the strength. Used as embankment material, roadbed material, soil freezing suppression material, excavation backfill material, liquefaction countermeasure material, backfill material behind structures, etc. SLS can adjust its lightness, shear and compressive strength by blending, so it can satisfy the lightness and strength required for design according to the properties of the raw material such as soil, and can be used extremely effectively for civil engineering It is a material, and when various kinds of waste materials are used, it is also an environmental measure. However, it is extremely difficult to satisfy the time and quantity (100-500 m ³ per day) for materials that differ in specific gravity by as much as 100 times for civil engineering, and it is extremely difficult to mix and manufacture homogeneously. It was realized for the first time by a batch mixer with a simple structure with mixing blades.

The present invention also works effectively for the production of a new type of mixed stabilization treated soil called short braided mixed reinforcing soil.

That is, a short braid cut to a length of about 3 to 7 cm with the remaining soil (about 10 to 300 μm in diameter, and the mixing amount is 0.2% of the weight of the soil.
(Approximately 1.0%), and a large tensile strength can be imparted to the soil having a low tensile strength by the frictional force between the soil and the fiber and the tensile strength of the fiber.

Conventionally, there is no mixing mixer capable of this type of mixing at all, and it is possible to mix the soil with slurry (200-500% water content) using other mixers. (20-150%), the mixture is unevenly hardened and cannot be homogeneously mixed. However, in the case of a slurry, it is too soft and extremely difficult to perform, and the strength is not sufficient.
Therefore, there has been a long-awaited demand for a method in which heavy machinery can be installed in a state of ordinary water content and mixing is performed in a state where the strength is greatly enhanced.

The mixing mixer of the present invention can meet such a demand, and only by attaching a cutting and feeding device such as the one described below, the cycle and the like do not change, and it is possible to simultaneously mix cement and styrene foam. is there.

[Conventional technology]

Conventionally, as an agitator for obtaining a uniform product by stirring and mixing a fluid such as a high-viscosity liquid or slurry-like substance, for example, the invention of JP-A-2-40228 has been disclosed. The invention comprises outer and inner spiral band blades fixed to a common rotation axis and having opposite spiral directions in a container having a supply port and an outlet.

[Problems to be solved by the invention]

In the above-mentioned conventional stirring device, it is possible to uniformly stir and mix when treating a fluid, but as in the present invention, pulverize and crush lumpy substances such as soil, coal ash, refuse incineration ash, and tailings. However, it is almost impossible to mix evenly and in large amounts with particles of styrene foam, which is 100 times lighter.

SUMMARY OF THE INVENTION An object of the present invention is to provide a mixer having a simple structure in which these hard-to-mix SLS materials can be uniformly mixed in a large amount without using a pretreatment device for pulverizing and crushing.

[Means for Solving the Problems] The mixer for mixing a massive substance having a remarkable difference in specific gravity according to the present invention has the following constitution as means for achieving the above object.

(1) In a container having a supply port and an outlet above and below the center,
Outer and inner spiral band wings fixed to a common rotation axis are provided, and the outer and inner spiral band blades are cut off in the vicinity of a central portion, respectively, and the outer spiral band blade left portion and the outer spiral band blade right portion are provided. And the spiral direction is opposite to the left and right portions of the respective outer spiral band blades, and the left and inner spiral band blades have opposite spiral directions.

(2) In the container, the outer spiral band blade left and right portions transfer the contents from the left and right ends toward the center, and the inner spiral band blade left and right portions conversely move the contents. The direction of rotation of the rotating shaft and the helical direction of each helical band blade are defined so that the helical band is transported from the center toward the left and right ends.

(3) A double-lined corrugated blade or intermittent projecting piece (fold) such as a hammer is provided on the outer periphery of the outer spiral band blade so that it can be used without using a special pretreatment device for pulverization and crushing. .

(4) The container and the rotating shaft are each mounted with a slight play.

(5) The outer spiral band blade is provided with an appropriate number of holes.

(Operation)

In the mixer configured as described above, the capacity and the cycle time can be interconnected to have a production capacity corresponding to the amount of civil engineering work.
This is a single-shaft rotary mixer with 3.0 m ³ and a cycle time of 2 to 4 minutes (depending on the properties of the raw material such as soil). The outer and inner sides of the mixing blade are provided symmetrically, and the rotation speed is 10 to 30 times / minute. (The number of rotations is slightly different depending on the soil properties of the raw material soil, and is appropriately selected.) The above-described cycle time includes the raw material measurement, premixing, main mixing, and discharge time.

The pre-mixing is to mix a lightweight material such as styrene foam and lime or cement evenly through a small amount of water.

The main mixing is to add a raw material such as soil and mix them evenly.

The mixing mixer of the present invention is provided with a special single-shaft double rotor as described later, and performs the following four functions at the same time.

(1) Pulverize one of the raw materials, such as soil. Agglomerated soil, clumpy clay-like clumps, and various sludge dewatered press clumps are crushed into fine particles.
Relax. It is primarily the function performed between the folds formed on the outside of the outer swirler and the skin of the mixer vessel. It acts like a saw between the pleats and the skin. These folds are also useful for rubbing, concrete, etc., which are difficult to crush, to slip through the folds with a slight movement so that they do not get caught between the wing and the outer plate and break. ing. For this reason, the folds are made of a super-hard material.

(2) The soil below the left and right ends in the mixer vessel is forcibly moved upward in the center. To this end, the outer spiral band creates this movement in the helical and rotational directions.

(3) Objects gathered by the outer spiral band blades above the central portion in the mixer container are forcibly moved to the left and right ends by the inner spiral band blades. The spiral pitches of the outer wing and the inner wing are set so as to make the respective feed amounts equal.

By both the above (2) and (3) movements,
The outer-inward movement and the help of gravity are added in part, and the downward-upward movement is repeated everywhere. The left and right exchanges are performed by wrapping the outer and inner wings in the center. This movement is performed regardless of the specific gravity of the material.

(4) In order not to make the movement uniform, the outer wing is perforated, creating a difference in the speed of movement, causing shear in the material and enhancing the mixing effect.

In the mixing mixer of the present invention, the rotation speed is adjusted for the following purpose.

(1) Uniformize the torque generated at the time of loosening and mixing of the raw materials. When the torque is small, the speed is increased, and when the torque is large, the speed is decreased.

(2) The generation of torque depends on the mixing ratio of heavy and light materials. Adjust the rotation accordingly.

The reason why the outer spiral band blade is caused to move inward (in the center) is that the discharge port for the mixture is provided at one place below the center part, so that it also has a function of collecting the outlet there.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, FIG. 1 is an overall arrangement showing an example of a lightweight soil plant having a mixer for mixing according to the present invention, wherein 1 is a mixer, 2 is a mixer power board, and 3 is a sediment measuring tank. , 4 is a cement measuring tank, 5 is a water measuring tank, 6 is a bottle of EPS granules (styrene foam granules), 7 is a capacity measuring tank, 8 is a belt conveyor for conveying earth and sand,
9 is an operation panel, and 10 is a cement silo.

FIG. 2 shows an example of a time table showing the operation of the lightweight soil plant shown in FIG. 1, in which EPS, cement, and water are measured for 4 minutes to 220 seconds, and the discharge and mixing are performed for 320 seconds to 22 seconds.
The weighed earth and sand are added and mixed in 0 seconds, and the release is completed in 160 seconds, and the next batch will be accepted.

FIG. 3 is a partially cut plan view, a front view, and a partially cut side view showing an example of the mixing mixer of the present invention. In the figure 11
Is a container, not shown, having a supply port above the center and an outlet below it. The container 11 has a degree of freedom only by being placed on the four support frames 12. A rotating shaft 13 is provided in the container 11, supported by a bearing 14 (fixed), and connected to a speed reducer 15 (hanging and having a considerable degree of freedom). The speed reducer 15 is belt-driven by a motor 16. A large-diameter outer spiral band wing left portion 17 and a right outer portion 17 ′ are fixed to the rotating shaft 13 by support pieces (not shown). The left portion 17 and the right portion 17 'face each other except for a wrap portion at a central portion, and have opposite spiral directions. The rotating shaft 13 has a small diameter inner spiral band wing left portion 18 and a right portion 18 ′.
Are fixed by support pieces (not shown). The left portion 18 and the right portion 18 'face each other except for a wrap portion at the center portion, and have opposite helical directions. Also left part 17
The left part 18, the right part 17 'and the right part 18' also have opposite helical directions. And during operation, the contents are outer spiral band wing 17,
The rotation direction of the rotating shaft 13 and each band are adjusted so that the contents are transferred from both ends of the container 13 toward the center by the 17 'and the inner spiral band blade transfers the contents from the center to both ends of the container. The spiral effect of the wings 17, 17 ', 18, 18' is specified to increase the mixing effect. Reference numeral 19 denotes holes provided in the outer spiral band blades 17 and 17 ', whereby the transfer speed of the contents can be adjusted, a shearing action can be generated, and the mixing effect can be further improved.

FIG. 4 is a front view and a perspective view showing an example of the outer spiral band blades 17, 17 '. In this case, two inner and outer corrugated outer blades 17a, 17a of a double lining type are attached, and are viscous and massive. Has the effect of loosening the soil that forms the surface with a rotating saw blade. 19 is the aforementioned hole.

FIG. 5 is a front view and a perspective view showing another example of the outer spiral band wings 17 and 17 '. In this case, a large number of hammers 17b are attached to the inner and outer layers in a double lining system, and a considerably hard rock piece is formed. Demonstrate the ability to crush.

FIG. 6 shows a fiber cutting and feeding device used for producing the above-mentioned short fiber-reinforced mixed soil. The yarn winding table 20 pulls out about 200 to 5 yarns per yarn from 10 to 5 yarn guides.
Pull out with roller 22 through 1, cut with cutter 23,
This is blown into the mixer by the blower 24.

The measurement of the yarn is carried out by measuring the weight of the bobbin minus or by measuring the bobbin length.

〔The invention's effect〕

 The effects provided by the present invention are as follows.

(1) Materials with specific gravities about 100 times different from those in the measurement stabilization process (such as soil and styrofoam) can be processed with a simple device in a time and amount (100 to 500 m ³ per day) corresponding to civil works.

(2) No extra equipment is required for grinding and crushing.

(3) It is possible to produce a short reinforced mixed soil.

[Brief description of the drawings]

FIG. 1 is an overall layout diagram showing an example of a lightweight soil plant, FIG.
The figure shows an example of a timetable, FIG. 3 shows an example of a mixing mixer of the present invention, a partially cut plan view, a front view and a partially cut side view, and FIGS. It is the front view and perspective view which show an example of a wing. FIG. 6 is a perspective view showing an example of a cutting and feeding device. 1: Mixer, 2: Mixer power board 3: Earth and sand measuring tank, 4: Cement measuring tank 5: Water measuring tank, 6: EPS grain bottle 7: EPS grain 8: Belt conveyor capacity measuring tank for earth and sand transport 9: Operation panel, 10: Cement silo 11: Container, 12: Support frame 13: Rotating shaft, 14: Bearing 15: Reduction gear, 16: Motor 17, 17 ': Outer spiral band blade 18, 18': Inner spiral band blade 19 : Hole, 17a: Edge of corrugated outer circumference 17b: Hammer 20: Winding stand, 21: Guide 22: Roller, 22: Cutter 24: Blower

Claims (2)

(57) [Claims] An outer and inner spiral band wing fixed to a common rotating shaft is provided in a container having a supply port and an outlet above and below a central portion. It is cut in the vicinity, the outer spiral band blade left part and the outer spiral band blade right part have a spiral direction opposite, and the inner spiral band blade left part and the inner spiral band blade right part are opposite and The left and right outer spiral band blades have a spiral direction opposite to the left and right portions of each outer spiral band blade. The rotation direction of the rotating shaft and the helical direction of each helical band blade are defined so as to convey the contents from the central portion toward the left and right ends, opposite to the left and right band members. Provide intermittent protruding pieces such as corrugated blades or multiple hammers on the outer circumference of Forms a I, mixing mixer significant bulk material difference in specific gravity, wherein the container and the rotary shaft are respectively fitted with play. 2. A mixer according to claim 1, wherein an appropriate number of holes are provided in said outer spiral band blade.