JP2004130276A - Mud recycle apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a mud recycle apparatus which, when mud is recycled to improved soil, mass-produces excellent improved soil having stable quality by a batch method. <P>SOLUTION: In the mud recycle apparatus, a mixer 3 is supported by a machine frame 1 through load cells 2, a conveyor 4 for mud, a metering conveyor 5 for a flocculation material, and a metering conveyor 6 for a neutral solidifying material are installed to carry the materials to the mixer 3, a comparison operation unit 7 that performs the comparison operation of the measured value by the load cells 2 and the preset values of the flocculation material and the neutral solidifying material is installed, and the flocculation material and the neutral solidifying material are measured based on signals from the operation unit 7 and fed to the mixer 3. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mixing device for recycling mud into improved soil.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a method of improving the soil quality of mud and recycling it into useful soil is known (for example, Patent Documents 1, 2, 3, and 4).
[0003]
However, it has been difficult to determine the quantitative stability and uniformity of a large amount of mud and additives.
[0004]
[Patent Document 1]
JP-A-10-272498 (page 39, right column, line 39 to page 8, right column, bottom line)
[Patent Document 2]
JP-A-2000-44945 (page 4, right column, line 22 to page 6, right column, one line)
[Patent Document 3]
JP 2001-182044A (page 5, left column, line 47 to page 6, right column, line 34)
[Patent Document 4]
JP 2002-1394A (page 5, right column, lines 34 to 44)
[0005]
[Problems to be solved by the invention]
An object of the present invention is to mass-produce an improved soil having a stable and uniform soil quality in a batch manner by adding and stirring a predetermined ratio of an additive to a large amount of mud.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention first supports a mixer via a load cell in a machine frame, and provides a mud conveyor, a coagulating material measuring conveyor and a neutral solidifying material measuring conveyor to the mixer, A calculating unit for comparing the measured value of the load cell with the set value of the agglomerated material and the neutral solidifying material, wherein the aggregating material and the neutral solidified material are metered and supplied to the mixer by a signal from the calculating unit. Mud recycling equipment,
Second, the mud recycling apparatus according to the first invention, wherein a water supply device with a flow meter and a dry air blower are connected to the mixer.
Thirdly, the mud recycling apparatus according to the first or second invention, wherein the mixer is a two-shaft mixer, each of which has stirring blades on both rotating shafts, and a discharge port that can be opened and closed on a bottom surface between both shafts.
It is constituted by.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
A machine box 12 of the mixer 3 is supported on a machine frame 1 provided on a floor or ground 14 via four load cells 2.
[0008]
The machine box 12 supports parallel horizontal rotating shafts 10 and 10 by bearings 15 and 15. Each shaft 10 is provided with a plurality of arms 16 at helical positions, and each arm 16 is provided with a stirring blade 11 and a mixer 3. To form
[0009]
The two rotating shafts 10, 10 are rotated in opposite directions by meshing gears 17, 17 at projections outside the bearings 15, 15,
Drive motors 19, 19 are connected to pinions 18, 18 meshing with meshing gears 17, 17 provided on both protruding portions, and the torque of the rotating shafts 10, 10 can be detected.
[0010]
The machine box 12 is provided with two cylinders 12 ', 12' for accommodating the above-mentioned two rotating shafts 10, 10 and a discharge port 13 on a convex arc-shaped bottom surface 12 "connecting the cylinders 12 ', 12'. The discharge port 13 can be opened and closed by rotating the opening / closing plate 20 around a support shaft 21 with a cylinder 22.
[0011]
At the upper end of the machine box 12, an inlet 14 'for the screw conveyor 4 for mud (raw mud) is opened, and further, the inlets 5' and 6 'for the screw conveyor 5 for the coagulant and the screw conveyor 6 for the neutral solidified material. Is opened via weighing machines 5 ", 6".
[0012]
The mud (raw mud) put into the machine box 12 by the mud screw conveyor 4 is weighed by the four load cells 2 and the average weighed value is displayed on a display of the control unit 23 by a signal.
[0013]
The viscosity and density of the input mud are measured in advance, and the unit weight and viscosity (viscosity) are almost constant.
[0014]
The input amount of the mud is about half the capacity of the machine box 12, and the amount of the input mud by the load cell 2 is detected.
[0015]
In this way, the detected value of the mud (raw mud) is compared with the set value of the setting unit of the control unit 23 by a signal from the load cell 2 and is stored and fed back to stop the mud conveyor 4, but the horizontal value is determined. The stirring operation by the rotating shafts 10 continues.
[0016]
At the time when the detected value measured by the load cell 2 reaches the set value of the mud, the weight ratio of the coagulant and the neutral solidified material is compared and calculated by the comparison calculator 7, and the mud input amount is determined by the signal. The metering screw conveyor 5 and the metering screw conveyor 6 for the neutral solidified material are started, and the input amount is measured by the measuring devices 5 "and 6", and the metered amount is charged into the container 12 and automatically stopped.
[0017]
The above-mentioned charging can be performed simultaneously or staggered, and the stirring operation continues even during the charging, the mud is stirred and mixed with the coagulant and the neutral solidifying material, and the coagulant is dissolved in the mud or the mud-containing water. , Take in moisture and lose its properties as free water, so that the soil particles are agglomerated, while the neutral solidifying material reacts with moisture to set and harden,
Further, the soil particles aggregated by the fixation and hardening of the water accompanying the mixing are aggregated to form large hardened particles including the soil particles. Of course, the pH of the mud is neutralized to about 7 and It is regenerated into clay soil.
[0018]
With the passage of time set in advance by the mixing test, the cylinder 22 operates to rotate the convex arc-shaped opening / closing plate 20 of the convex arc-shaped bottom surface 12 ″ to open the discharge port 13. It is discharged downward as mixed reformed soil) and discharged outside the machine by the carry-out conveyor 25.
[0019]
Examples of the aggregating material include acrylic acid light metal salt, acrylamide copolymer, anionic polyacrylamide polymer, water-absorbing resin, polyacrylamide partial hydrolyzate, natural vegetable powder, and inorganic aggregating materials such as aluminum sulfate and polyaluminum chloride. It is suitable.
[0020]
Further, as the neutral solidifying material, hemihydrate gypsum, type 3 anhydrous gypsum, and various other hydraulic gypsum having an action of maintaining the strength of the solidified material can be used.
[0021]
As described above, the free water contained in the mud is fixed in the mixer 3 by the quantitative mixing of the coagulant and the neutral solidifying material, and the neutralized (about PH7) state which does not exhibit alkalinity. Regenerated soil can be obtained in a batch manner by the mixer 3.
[0022]
Hot air (gas) from a dry air blower is blown into the machine box 12 from the gas inlet 26 to the stirred mud in the mixing step to lower the atmospheric humidity, thereby reducing the reaction rate between the mud and the coagulant and the neutral solidifying material. Can be raised. Further, the water supply device 24 with a flow meter can be supplied into the machine box 12 to adjust the viscosity corresponding to the torque detected from the rotating shaft 10 of the stirring mud.
[0023]
In the figure, reference numeral 24 denotes a recycled soil discharge hopper, 27 denotes a mud (raw mud) input hopper, 28 denotes a coagulant input hopper, 29 denotes a neutral solidified material input hopper, and 30 denotes the arm 16 in the machine box 12. It is an open gas outlet.
[0024]
【The invention's effect】
Since the present invention is configured as described above, the set ratio of the coagulant and the neutral solidifying agent can be accurately charged and stirred with respect to the weight of the mud fed into the mixer, and the quality is rich in quantitative stability and uniformity. There is an effect that the improved soil can be mass-produced quickly and reliably in a batch system.
[0025]
Water can be supplied to the mixture in the mixer as necessary, or dry air (gas) can be supplied to adjust the quality and increase the reaction speed.
[Brief description of the drawings]
FIG. 1 is a front view showing a mud recycling apparatus of the present invention.
FIG. 2 is an enlarged vertical sectional view of a mixer.
FIG. 3 is a side view of FIG. 1 as viewed from the right.
FIG. 4 is a system block diagram.
FIG. 5 is a control system diagram.
FIG. 6 is an operation flowchart.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Machine frame 2 Load cell 3 Mixer 4 Conveyor for mud 5 Conveyor for agglomerated material 6 Conveyor for neutral solidification material 7 Comparison operation part 8 Water supply device with flow meter 9 Dry air blower 10 Rotary shaft 11 Stirring blade 12 Machine box 12 " Bottom 13 between both shafts Outlet

Claims (3)

Support the mixer via a load cell on the machine frame,
A mud conveyor, a coagulating material measuring conveyor and a neutral solidifying material measuring conveyor to the mixer are provided,
Comprising a calculation unit for comparing the measured value of the load cell and the set value of the coagulant and the neutral solidifying material,
A mud recycling apparatus characterized in that the coagulant and the neutral solidifying material are metered and supplied to the mixer according to a signal from the arithmetic unit. The mud recycling apparatus according to claim 1, wherein a water supply device with a flow meter and a dry air blower are connected to the mixer. The mud recycling apparatus according to claim 1 or 2, wherein the mixer is a two-shaft mixer, each of which has stirring blades on both rotating shafts, and an openable / closable discharge port on a bottom surface between the two shafts.

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