JPH0825343A - Mixing apparatus of cementitious injection material - Google Patents

Abstract

PURPOSE:To prevent the deterioration of work environment caused by the scattering of cement at the time of the throwing-in of cement in a cement mixing apparatus. CONSTITUTION:A vertical hollow stirring shaft 2 having stirring blades 6 provided to the periphery of the opened lower end part thereof is provided to the center part of a hermetically closed mixing tank 1 so as to be rotationally driven by a motor 3 and a cyclone 9 composed of a hermetically closed container is arranged to the upper end of the hollow stirring shaft 2 and a cement suction port 10 is provided to the annular peripheral surface of the cyclone 9 along the tangential direction thereof and the vacuum suction pipe 14 connected to a vacuum pump 13 is connected to the cyclone 9 at an appropriate position through a filter 15 and a rotary feeder 8 is provided to the lower part of the discharge port of the cyclone 9. The suction hose 12 opened to a cement supply part 11 at one end thereof is connected to the cement suction port 10 and a fresh water supply pipe 5 is connected to the mixing tank at an appropriate position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for mixing cement and liquid, and in particular, for mixing cement and fresh water to produce cement-based injecting materials such as cement milk and cement mortar used for civil works such as ground improvement. The present invention relates to a mixing device used to do this.

[0002]

2. Description of the Related Art Cement milk used in conventional ground improvement methods, etc., except for large stationary plants, is filled with fresh water into the mixing tank of a mixer, and then the bag-filled cement is directly sealed. It is manufactured by the method of putting in and mixing.

[0003]

[Problems to be Solved by the Invention] The above-mentioned conventional mixer cannot prevent the scattering of cement when the cement is poured into the fresh water of the mixing tank, and the generated dust deteriorates the working environment and pollutes the surroundings. There was a problem of bringing.

Further, since the cement contained in the bag is charged from the upper part of the mixing tank, it is necessary to manually lift the cement bag to a high position, which is a heavy labor burden and
The cement put into the fresh water of the mixing tank floats on the water surface and the mixing effect is poor, and it takes a considerable mixing time to complete the mixing.

[0005]

In order to solve the above-mentioned conventional problems, the present invention provides a vertical hollow stirring shaft in which a stirring blade 6 is provided around the open lower end in the central part of a closed mixing tank 1. 2 is rotatably driven by a motor 3, and a cyclone 9 consisting of a closed container is installed on the upper end of the hollow stirring shaft 2, and a cement suction port 10 is provided on the annular peripheral surface of the cyclone 9 substantially along its tangential direction. A vacuum suction pipe 14 connected to a vacuum pump 13 is provided at an appropriate position through a filter 15, a rotary feeder 8 is provided below a discharge port of a cyclone 9, and a cement supply unit 11 is provided at a cement suction port 10. A mixing device for cement-based injectable material is proposed, in which a suction hose 12 having one end opened is connected to and a fresh water supply pipe 5 is connected to an appropriate position of a mixing tank.

[0006]

The cement C in the supply section 11 is vacuum-sucked into the closed cyclone 9 by the suction hose 12 by the negative pressure generated by the vacuum pump 13, from which the hollow stirring shaft 2 is passed through the lower opening of the stirring blade 6. Since it is directly scattered into the fresh water in the peripheral portion and is surely stirred and mixed with the fresh water by the rotation of the stirring blades 6 at the same time as this scattering, the reduction of 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 the hollow stirring shaft via the rotary feeder,
It is continuously metered into fresh water in the mixing tank.

[0008]

EXAMPLE A hollow agitation shaft 2 is vertically installed at a central portion of a mixing tank 1 by a motor 3 via a rotary gear mechanism 4 so as to be freely rotatable, and a fresh water supply pipe 5 for supplying fresh water W to the mixing tank 1. Is piped.

The hollow stirring shaft 2 is open at its lower end, and a plurality of stirring blades 6 are radially provided on the outer periphery of the lower end of the hollow stirring shaft 2. An annular cover plate 7 is attached in series to the upper ends of the tips of the stirring blades 6. In addition, a cyclone 9 composed of a funnel-shaped closed container is installed at the upper end of the hollow stirring shaft 2 via a rotary feeder 8.

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 therewith. The vacuum suction pipe 14 having one end connected to the vacuum pump 13 is connected to an appropriate position of the cyclone 9 via a filter 15 such as a bag filter.

A baffle plate 16 is provided at the bottom of the mixing tank 1 close to 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 structure, when the cement-based injecting material is stirred and mixed, a certain amount of fresh water W is first supplied into the mixing tank 1 through the fresh water supply pipe 5.

Then, by driving the vacuum pump 13 to suck the inside of the cyclone from the vacuum suction pipe 14 through the filter 15 to make it a negative pressure, the cement suction port 10
Through the suction hose 12, the cement C in the cement supply unit 11 is vacuumed and sucked into the cyclone at a high speed, where the lower part of the cyclone is rotated by centrifugal force along the circumference of the cyclone by the principle of the cyclone. Pile up in a cone.

The accumulated cement C is continuously discharged in a fixed amount in sequence into the hollow stirring shaft 2 rotating below the rotary feeder 8 at the bottom of the cyclone 9, and the lower opening is opened. And falls into the mixing tank 1.

At this time, the stirring blades 6 rotate 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 by the turbulent flow with the baffle plate 16 opposite thereto are surely stirred and mixed, The mixed solution is discharged to the outside of the baffle plate 16 by centrifugal force, and the mixed solution above the stirring blade 6 is stirred through the 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 in order to be mixed by stirring.

The baffle plate 16 prevents the rotating flow of the same speed which tends to occur 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 part is vacuum-sucked into the closed cyclone by the suction hose by the negative pressure generated by the vacuum pump, and from here, through the hollow stirring shaft, from the lower opening. Since it spatters directly into the fresh water in the peripheral part of the stirring blade, and at the same time as the stirring blade is rotated, it is surely stirred and mixed with the fresh water,
It is possible to eliminate the decrease in mixing effect due to the scattering of cement dust and the floating of cement, and without raising the cement bag of considerable weight to the top of the mixer,
The cement can be sucked by the negative pressure near the ground surface, and the labor burden can be reduced.

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

[Brief description of drawings]

FIG. 1 is a vertical sectional front view systematically showing the 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]

 1 Mixing Tank 2 Hollow Stirring Shaft 3 Motor 4 Rotating 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 Section 12 Suction Hose 13 Vacuum Pump 14 Vacuum Suction Pipe 15 Filter 16 Interfering Board 17 outlet

Claims (2)

[Claims] 1. A hollow vertical rotating shaft provided with stirring blades around an open lower end is rotatably driven by a motor at the center of a closed mixing tank, and a closed container is provided at the upper end of the rotating shaft. Cyclone is installed, and the cement suction port is provided along the annular circumferential surface of this cyclone almost along the tangential direction, and a vacuum suction pipe connected to a vacuum pump is connected at an appropriate position through a filter, A mixing device for cement-based injection material, characterized in that a suction hose having one end opened to a cement supply part is connected to the suction port, and a fresh water supply pipe is connected to an appropriate position of the mixing tank. 2. A hollow vertical rotating shaft provided with stirring blades around an open lower end is provided at the center of a closed mixing tank so as to be rotatable by a motor, and an upper end of the rotating shaft is connected to a closed container. A cyclone is installed, and a cement suction port is provided along the annular circumferential surface of this cyclone substantially along the tangential direction, and a vacuum suction pipe connected to a vacuum pump is connected at an appropriate position through a filter, and the cyclone is A rotary feeder is provided below the discharge port of the cement, a suction hose with one end opened to the cement supply part is connected to the cement suction port, and a fresh water supply pipe is connected to an appropriate position of the mixing tank. Cement-based injecting material mixing device.