JP2814350B2 - Mixing device for cement-based injection material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for mixing cement and liquid, and more particularly to mixing cement and fresh water to produce a cement-based injection material such as cement milk or cement mortar used for civil engineering works such as ground improvement. The present invention relates to a mixing device used to perform the mixing.

[0002]

2. Description of the Related Art Cement milk, etc. used in the conventional soil improvement method, except for large stationary plants, is charged with fresh water into a mixing tank of a mixer, and then bagged cement is cut directly into the fresh water. It is manufactured by the method of putting in and mixing.

[0003]

The above-mentioned conventional mixer cannot prevent the cement from being scattered when the cement is poured into the fresh water of the mixing tank, and the generated dust deteriorates the working environment and causes dust pollution to the surroundings. There was a problem that brought.

[0004] Further, since the cement contained in the bag is charged from the top of the mixing tank, it is necessary to manually lift the cement bag to a high position, and the labor burden is severe.
The cement put into the fresh water of the mixing tank floats on the water surface and the mixing effect is poor, and a considerable mixing time is required until the mixing is completed.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention provides a vertical hollow stirring shaft provided with a stirring blade 6 in the center of a closed mixing tank 1 around an open lower end. 2 is rotatably driven by a motor 3, a cyclone 9 composed of a closed container is installed at the upper end of the hollow stirring shaft 2, and a cement suction port 10 is formed on the annular peripheral surface of the cyclone 9 substantially along a tangential direction thereof. At the same time, a vacuum suction pipe 14 connected to a vacuum pump 13 is connected at an appropriate position via a filter 15, a rotary feeder 8 is provided below a discharge port of the cyclone 9, and a cement supply unit 11 is provided at a cement suction port 10. Is connected to a suction hose 12 having an open end, and a fresh water supply pipe 5 is connected to an appropriate position in a mixing tank.

[0006]

The cement C in the supply section 11 is vacuum-suctioned into the closed cyclone 9 by the suction hose 12 due to the negative pressure generated by the vacuum pump 13, and from there through the hollow stirring shaft 2 to the stirring blade 6 through the lower opening. Since the water is directly scattered into the fresh water in the peripheral portion and is simultaneously stirred and mixed with the fresh water by the rotation of the stirring blade 6, the decrease in the mixing effect due to the scattering of the cement dust and the floating of the cement is eliminated.

The cement sucked into the cyclone is supplied to a hollow stirring shaft via a rotary feeder.
It is continuously metered into fresh water in the mixing tank.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A hollow stirring shaft 2 is vertically installed at the center of a mixing tank 1 so as to be rotatable and driven by a motor 3 via a rotary gear mechanism 4, and a fresh water supply pipe 5 for supplying fresh water W to the mixing tank 1. Is plumbed.

The lower end of the hollow stirring shaft 2 is open, and a plurality of stirring blades 6 project radially outward from the lower end of the stirring shaft. At the upper end of the hollow stirring shaft 2, a cyclone 9 composed of a funnel-shaped closed vessel is provided via a rotary feeder 8.

[0010] A cement suction port 10 is provided on the annular circumferential surface of the cyclone 9 substantially along the tangential direction thereof, and a suction hose 12 having one end opened to a cement supply section 11 such as a cement storage tank or a cement bag is provided. The other end of a vacuum suction pipe 14 having one end connected to a vacuum pump 13 at an appropriate position of the cyclone 9 is connected via a filter 15 such as a bag filter.

A baffle plate 16 is provided at the bottom of the mixing tank 1 near the periphery of the rotating portion of the stirring blade 6.

Further, a discharge port 17 is provided on the bottom surface.

In the above configuration, when stirring and mixing the cement-based injection material, first, a certain amount of fresh water W is supplied into the mixing tank 1 from the fresh water supply pipe 5.

Then, the vacuum pump 13 is driven to suck the inside of the cyclone from the vacuum suction pipe 14 through the filter 15 to make the cyclone negative pressure.
Through the suction hose 12, the cement C in the cement supply unit 11 is vacuum-suctioned and sucked into the cyclone at a high speed. Here, the lower part of the cyclone is rotated along the circumference of the cyclone by centrifugal force according to the cyclone principle. Accumulate in a cone.

In accordance with the rotation of the rotary feeder 8 at the bottom of the cyclone 9, the accumulated cement C is sequentially and continuously discharged into the hollow agitating shaft 2 rotating below the cyclone 9 by a constant amount. And fall into the mixing tank 1.

At this time, the stirring blade 6 rotates together with the rotation of the hollow stirring shaft 2, and the cement C and the fresh water W scattered by the stirring and mixing action due to the turbulent flow with the baffle plate 16 opposed thereto are reliably stirred and mixed. The mixed liquid is discharged to the outside of the baffle plate 16 by centrifugal force, and the mixed liquid above the stirring blade 6 is stirred through an inner space between the hollow stirring shaft 2 and the cover plate 7 of the stirring blade 6. It is introduced into the space between the blades 6 and is continuously circulated and mixed sequentially.

The baffle plate 16 prevents the rotational flow of the same speed from occurring in the mixing tank 1 due to the rotation of the stirring blade 6.

[0018]

As described above, according to the present invention, the cement in the supply section is vacuum-suctioned into the closed cyclone by the suction hose by the negative pressure generated by the vacuum pump, and from there, through the hollow stirring shaft through the lower opening. Since it is directly scattered into the fresh water in the peripheral part of the stirring blade, and simultaneously with this discharge, the stirring blade is reliably stirred and mixed with the fresh water,
It is possible to eliminate the mixing effect caused by the scattering of cement dust and the floating of cement, and without raising a heavy cement bag up to the top of the mixer.
The cement can be sucked by negative pressure near the ground surface, and the burden on labor can be reduced.

Further, since the cement in the cyclone is supplied to the hollow stirring shaft via the rotary feeder, the cement can be continuously and quantitatively injected into the fresh water in the mixing tank.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view systematically showing an outline of an apparatus of the present invention.

FIG. 2 is a plan view of a stirring blade portion according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mixing tank 2 Hollow stirring shaft 3 Motor 4 Rotary gear mechanism 5 Fresh water supply pipe 6 Stirring blade 7 Cover plate 8 Rotary feeder 9 Cyclone 10 Cement suction port 11 Cement supply unit 12 Suction hose 13 Vacuum pump 14 Vacuum suction pipe 15 Filter 16 Plate 17 outlet

Claims (2)

(57) [Claims] 1. A hollow vertical rotating shaft having a stirring blade provided around an opened lower end portion is rotatably driven by a motor at the center of a closed mixing tank, and is rotatably driven by a motor. A cyclone is provided, and a cement suction port is provided substantially in the tangential direction on the annular peripheral surface of the cyclone, and a vacuum suction pipe connected to a vacuum pump is connected at an appropriate position via a filter, and the cement is provided. A cement-based injectable mixing device, characterized in that a suction hose is connected to a suction hose having one end open to a cement supply part, and a fresh water supply pipe is connected to an appropriate position of the mixing tank. 2. A hollow vertical rotating shaft having a stirring blade provided around an open lower end portion is rotatably driven by a motor at the center of the closed mixing tank, and is rotatably driven by a motor. A cyclone is provided, a cement suction port is provided on the annular peripheral surface of the cyclone substantially in a tangential direction thereof, and a vacuum suction pipe connected to a vacuum pump is connected at an appropriate position through a filter, and the cyclone is provided. A rotary feeder is provided below the discharge port of the cement supply port, a suction hose having one end opened to the cement supply section is connected to the cement suction port, and a fresh water supply pipe is connected to an appropriate position of the mixing tank. Mixing system for cement-based injection material.