JP2013085989A - Powder mixture manufacturing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-quality inexpensive apparatus that can give a uniform mixture of a basic material such as sand and a powder such as bentonite, and can uniformly add a fluid (water) to a powder mixture (mixed soil of bentonite) without forming dumpling-like clods of the powder mixture (mixed soil of bentonite), and further can avoid quality degradation caused by adhesion of the powder mixture (mixed soil of bentonite) to a mixer and low work efficiency caused by cleaning work or the like of the mixer.SOLUTION: The powder mixture manufacturing apparatus 100 mixes the basic material (for example, sand) with the powder (for example, bentonite) and adds a fluid (for example, water) to manufacture the powder mixture (mixed soil of bentonite) having a desired fluid content ratio (water content ratio). The apparatus includes a basic material feeder 200, a powder feeder 300, a mixer 400, and a fluid feeder 500.

Description

  The present invention relates to an apparatus for producing a powder mixture. For example, a base material such as sand or gravel and a powder such as bentonite are uniformly mixed to add a fluid (for example, water), and a desired fluid content ratio (water content) The present invention relates to an apparatus for producing a powder mixture (bentonite mixed soil) having a ratio).

  Bentonite mixed soil is a mixture of soil such as sand and gravel and bentonite, and is used as a material for constructing a low water permeability layer of a waste disposal facility. In addition, bentonite may be used alone when extremely high water permeability is required as in a radioactive waste disposal facility. In order for the bentonite or bentonite mixed soil for constructing the low water permeability layer to exhibit the required low water permeability, it is necessary to perform sufficient compaction to increase the density of the low water permeability layer. For this reason, it is common to perform a moderate water addition and make bentonite and bentonite mixed soil into a wet state so that compaction can be performed easily.

  As a method of adding water to bentonite or bentonite mixed soil, for example, soil and bentonite are mixed in a biaxial forced mixer for concrete production, a bag mill type mixer, or a mixing machine called a self-propelled soil improvement machine or stabilizer. A method is known in which water is added to the soil and mechanically stirred and mixed with soil, bentonite and water (see, for example, Patent Document 1 and Patent Document 2).

JP-A-10-100132 JP 2010-222874 A

  However, it is known that bentonite and bentonite mixed soil easily adhere to the blades and rotating shaft of the mixer when the material is mechanically stirred and mixed because bentonite exerts a strong viscosity when it is hydrated. Yes. Thereby, stirring performance falls and manufacture of homogeneous bentonite mixed soil becomes difficult. Moreover, in order to remove the deposits on the blades of the mixer, the rotating shaft, etc., it is necessary to once stop the mixing operation and perform cleaning, which requires a lot of labor and greatly reduces the work efficiency. There is.

  Furthermore, bentonite has a problem that it becomes difficult to produce homogeneous bentonite and bentonite mixed soil due to its viscous nature, if it is excessively mechanically stirred, it becomes a dumpling-like lump. .

  For such a problem, the technique described in Patent Document 1 includes an empty kneading part for kneading sand and gravel and bentonite, and a water adding part for adding water to the bentonite mixed soil after the kneading. The bentonite mixed soil to which water has been added is provided with a kneading section for further mixing. In this technology, after sand and gravel and bentonite are kneaded, water is added and kneaded, so that no dumpling-like lump (ball) is formed, and bentonite mixed soil with little variation can be produced. It is said.

  However, in the technique described in Patent Document 1, a mechanical mixing device such as a bag mill type mixer or a stabilizer is also used when mixing the empty kneaded bentonite mixed soil and water, and the stirring blade and the rotating shaft are used. It was difficult to say that the problem of bentonite mixed soil was solved.

  Patent Document 1 discloses a simple kneading method in which bentonite mixed soil is dropped in a vertical direction in a structure in which baffle plates are alternately projected. However, in this case as well, bentonite mixed soil adheres to the baffle plates, and maintenance becomes a problem. Furthermore, it is difficult to perform high-quality kneading with a simple kneading method in which the bentonite mixed soil collides with the baffle plate.

  Moreover, in the technique described in the said patent document 2, the bentonite and bentonite mixed soil in a dry state are poured out to the construction site of a low-permeability layer, water is supplied after that, and bentonite and bentonite mixed soil are poured out at the dredging site. And water are agitated. However, even in the technique described in Patent Document 2, as long as mechanical stirring is performed, the problem of bentonite mixed soil adhering to the stirring blade, the rotating shaft, etc. is not solved, and maintenance such as cleaning is necessary. It is. Furthermore, the method of stirring and mixing the bentonite mixed soil and water at the construction site of the low water permeable layer has a problem that the variation in quality is large.

  Furthermore, high-quality bentonite mixed soil cannot be produced unless the base material such as sand and gravel is mixed uniformly with bentonite, but the conventional mechanical stirring cannot always perform uniform mixing. was there. Such a problem can also occur when a fluid is added to a powder mixture composed of a base material and powder.

  The present invention has been proposed in view of the above-described circumstances, and is capable of uniform mixing when mixing powder such as bentonite with a base material such as sand, and further fluidizing the powder mixture (bentonite mixed soil). A powder mixture production device that can uniformly add fluid (add water) without adding powder (bentonite mixed soil) into a dumpling-like lump when adding water (adding water) The purpose is to do. In addition, the present invention is a high-quality and inexpensive powder that does not cause deterioration in quality due to adhesion of the powder mixture (bentonite mixed soil) to the mixing device or reduction in construction efficiency due to cleaning of the mixing device. An object of the present invention is to provide a body mixture manufacturing apparatus.

  The powder mixture manufacturing apparatus of the present invention has the following features in order to achieve the above-described object. That is, the powder mixture manufacturing apparatus of the present invention mixes powder (for example, bentonite) with a base material (for example, sand) and adds a fluid (for example, water) at a desired fluid content ratio (water content ratio). A powder mixture production apparatus for producing a powder mixture (bentonite mixed soil), comprising a base material supply device, a powder supply device, a mixing device, and a fluid mixing device. To do.

  The base material supply device measures the base material (sand) whose fluid content ratio (water content ratio) is measured so that it becomes a powder mixture (bentonite mixed soil) with a preset target fluid content ratio (target water content ratio). It is a device for supplying quantitatively. The powder supply device measures the powder (bentonite) whose fluid content ratio (water content ratio) has been measured so as to become a powder mixture (bentonite mixed soil) having a preset target fluid content ratio (water content ratio). It is a device for supplying quantitatively.

  The mixing device includes a plurality of deformation passages arranged in parallel in the vertical direction. Each deformation passage continuously changes in cross-sectional shape from the inlet toward the outlet, and between the inlet and the outlet of each deformation passage. In addition, a joining means for joining the base material (sand) and powder (bentonite) passing through each deformation passage, and a division for dividing the joined base material (sand) and powder (bentonite) to flow down to each deformation passage A device for uniformly mixing a base material (sand) and powder (bentonite) to produce a powder mixture (bentonite mixed soil).

  The fluid mixing apparatus includes a powder mixture supply unit that quantitatively supplies a powder mixture (bentonite mixed soil), a dropping unit that freely drops the powder mixture (bentonite mixed soil), and a powder mixture that falls freely (bentonite) A fluid is added to the powder mixture (bentonite mixed soil) by adding a spray unit having a plurality of spray nozzles that spray (spray) the fine particle fluid (water) onto the mixed soil). It is a device for.

  Moreover, in the powder mixture manufacturing apparatus of the present invention, the base material can be sand or gravel, and the powder can be bentonite.

  The powder mixture manufacturing apparatus of the present invention, for example, uniformly mixes a base material such as sand or gravel and a powder such as bentonite, and vertically drops it in a thinly spread state, thereby producing a particulate fluid (water). Can be sprayed (sprayed) in multiple directions from all directions to widely contact the powder mixture (bentonite mixed soil) and the fluid (water).

  As a result, the powder mixture (bentonite mixed soil) does not become a dumpling-like lump, and the fluid is uniformly added without causing problems such as adhering to the structural parts of the mixing device and the fluid mixing device. It becomes possible to (water).

  As described above, since the base material such as sand and bentonite are uniformly mixed, it is possible to improve the quality of the powder mixture (bentonite mixed soil) after adding the fluid (after adding water). Furthermore, since the construction efficiency is improved, it is possible to provide a high-quality and inexpensive powder mixture manufacturing apparatus.

The schematic diagram which shows the structure of the powder mixture manufacturing apparatus which concerns on embodiment of this invention. The detailed schematic diagram which expands and shows a mixing apparatus and a fluid mixing apparatus. The detailed schematic diagram of a fluid mixing apparatus. Explanatory drawing of a mixing apparatus.

  Hereinafter, an embodiment of a powder mixture manufacturing apparatus according to the present invention will be described with reference to the drawings. 1 to 4 show a powder mixture manufacturing apparatus according to an embodiment of the present invention. FIG. 1 is a schematic diagram showing an overall configuration, FIG. 2 is an enlarged schematic diagram of a mixing device and a fluid mixing device, and FIG. 4 is a detailed schematic diagram of the fluid mixing device, and FIG. 4 is an explanatory diagram of the mixing device. In FIG. 1 and FIG. 2, there are slight differences in the shapes of the mixing device and the fluid mixing device, but the embodiments are shown with slight changes, and there is no difference in the main configuration.

  In the following description, bentonite will be described as a representative example of powder, but the powder to which the present invention is applied is not limited to this, and may be applied to other powders such as cement. it can. Note that the powder targeted by this embodiment is solid particles having a particle size of less than about 1 mm. Moreover, the powder mixture produced | generated by mixing this powder and a base material is a solid particle with a particle size of about 1 mm-about 20 mm.

  The fluid is not limited to water and may be any fluid as long as it has a fluidity. For example, a concrete admixture (air entraining agent, water reducing agent, setting / setting modifier, thickener, It can be applied to various fluids such as a foaming agent / foaming agent solution). Therefore, in the following description, when a fluid other than water is used, the water content ratio refers to the fluid content ratio.

<Outline of mixture production apparatus>
As shown in FIG. 1, the powder mixture manufacturing apparatus 100 according to the embodiment of the present invention mixes bentonite, which is a powder, with sand or gravel, which is a base material, and performs water addition to obtain a desired water content. It is an apparatus for producing a powder mixture (bentonite mixed soil) having a ratio, and includes a base material supply apparatus 200, a powder supply apparatus 300, a mixing apparatus 400, and a fluid mixing apparatus 500. Hereinafter, each device will be described.

<Base material supply device>
The base material supply device 200 is a device for measuring and quantitatively supplying a base material (for example, sand) whose water content ratio has been measured so as to become a powder mixture having a preset target water content ratio. As shown in FIG. 1, the base material supply apparatus 200 includes a base material hopper 210 that receives members and a quantitative supply unit (not shown) for quantitatively supplying the base material. The base material hopper 210 is a device for temporarily storing the base material, and the base material stored in the base material hopper 210 is quantitatively supplied by the quantitative supply unit. The base material hopper 210 is supplied with a base material from an opening provided in the upper part. Specifically, using a heavy machine such as a power shovel, a base material such as sand is introduced into the base material hopper 210 from the opening. A belt conveyor 610 is installed below the base material hopper 210, and the base material supplied quantitatively is conveyed toward the powder supply device 300 by the belt conveyor 610.

  Although not shown, the base material hopper 210 is attached with a measuring device (for example, a load cell) for measuring its weight (the weight of the stored base material). By this metering device, it is possible to supply the base material quantitatively by continuously measuring the change in the base material weight and controlling the driving of the quantitative supply unit.

  The fixed amount supply unit includes, for example, a screw conveyor and a motor for rotationally driving the rotating shaft of the screw conveyor. The fixed amount supply unit may have any structure, and in addition to a device using a screw conveyor, devices such as a piston type, a diaphragm type, a plunger type, and a snake type can be used.

  In the present embodiment, the moisture content of the base material is measured in advance. For the moisture content measurement, a moisture content measuring device such as an infrared moisture meter may be used. The moisture content is measured at an appropriate time interval according to the condition of the base material (field packing in the yard, storage in the building, etc.).

<Powder supply device>
The powder supply device 300 is a device for measuring and quantitatively supplying a powder (for example, bentonite) whose moisture content has been measured so as to become a powder mixture having a preset target moisture content. The powder supply apparatus 300 includes a silo 310 for storing powder, a powder hopper 320 that receives the powder stored in the silo 310, and a quantitative supply unit for quantitatively supplying powder (see FIG. Not shown). The silo 310 is a device for preventing the influence of outside air humidity on the powder as much as possible. The powder stored in the silo 310 is supplied to the powder hopper 320 by a transport device such as a powder pump. The powder hopper 320 is an apparatus for temporarily storing powder, and the powder stored in the powder hopper 320 is quantitatively supplied by a quantitative supply unit. In addition, a belt conveyor 620 is installed below the powder hopper 320, and the quantitatively supplied powder is transported toward the mixing device 400 together with the base material on the belt conveyor 620. .

  Although not shown, the powder hopper 320 is attached with a weighing device (for example, a load cell) for weighing its weight (the weight of the stored powder). By this measuring device, the powder can be quantitatively supplied by continuously measuring the change in the powder weight and controlling the driving of the quantitative supply unit.

  The fixed amount supply unit includes, for example, a screw conveyor and a motor for rotationally driving the rotating shaft of the screw conveyor. The fixed amount supply unit may have any structure, and in addition to a device using a screw conveyor, devices such as a piston type, a diaphragm type, a plunger type, and a snake type can be used.

  In the present embodiment, the moisture content of the powder is measured in advance. For the moisture content measurement, a moisture content measuring device such as an infrared moisture meter may be used. The moisture content is measured at an appropriate time interval.

<Mixing device>
As shown in FIGS. 1, 2, and 4, the mixing device 400 includes a plurality of deformation passages 410 arranged in the vertical direction. Each deformation passage 410 has a continuously changing cross-sectional shape from the inlet toward the outlet, and the base material and powder passing through each deformation passage 410 are joined between the inlet and the outlet of each deformation passage 410. And a dividing portion that divides the joined base material and powder and flows them down to the respective deformation passages 410, thereby repeating the joining and division of the base material and the powder to make the base material and the powder uniform. To form a powder mixture. A hopper 420 is provided at the uppermost part of the deformation passage 410, and the base material and powder conveyed on the belt conveyor 620 are received and dropped into the deformation passage 410.

  The mixing apparatus 400 can use, for example, a technique relating to “kneading method and apparatus” described in Japanese Patent No. 2975891. In order to mix the base material and the powder using the mixing device 400 having such a configuration, as shown in FIG. 4, the base material and the powder having fluidity are fed from the inlet of each deformation passage 410. Thus, the cross-sectional shape of the mixture of the base material and the powder is continuously changed to promote mixing. Then, in the middle of the mixing step, a step of joining the base material and the powder flowing in each deformation passage 410, a step of dividing the joined base material and powder and flowing them to each deformation passage 410, and each deformation passage And a step of shifting the timing at which the base material and the powder flowing in 410 are joined to each other.

  A belt conveyor 630 is disposed at the lower portion of the mixing device 400, and the belt mixture 630 conveys the powder mixture (bentonite mixed soil 700) to the upper portion of the fluid mixing device 500. In the examples shown in FIGS. 1 and 2, the inclination angles of the belt conveyors 610, 620, and 630 are different from each other. Depending on the area, the amount of the base material to be transported, and the transport amount of the powder (for example, sand, bentonite, bentonite mixed soil), etc., the method can be changed as appropriate.

<Fluid mixing device>
As shown in FIGS. 1 and 2, the fluid mixing device 500 includes a powder mixture supply unit 510 that quantitatively supplies the powder mixture, a dropping unit 520 that freely drops the powder mixture, and a powder that freely falls. It is an apparatus for adding (hydrating) a fluid to a powder mixture by including an injection unit 530 having a plurality of injection nozzles 531 for injecting (spraying) fine particle fluid (water) onto the mixture. The fluid mixing device 500 of this embodiment is a water adding device.

  Specifically, as shown in FIGS. 2 and 3, the fluid mixing device (hydration device) 500 includes a substantially cylindrical drop unit 520, and the powder mixture supply unit 510 is disposed above the drop unit 520. Is arranged. The powder mixture supply unit 510 of the present embodiment includes a hopper 511 and a quantitative supply device 514 having a screw conveyor 512, a stirring blade 513, and the like, and the powder mixture (bentonite mixing) air-kneaded by the mixing device 400 The soil 700) is stored in the hopper 511, and the powder mixture (bentonite mixed soil 700) is quantitatively dropped into the dropping unit 520 by the quantitative supply device 514. The dropping unit 520 is provided with a diffusing device 521 so as to be positioned immediately below the hopper 511, and by this diffusing device 521, the powder mixture (bentonite mixed soil 700) spreads concentrically and within the dropping unit 520. Falls vertically.

  The dropping section 520 includes a plurality of injection nozzles that are positioned inside and outside the powder mixture (bentonite mixed soil 700) that spreads concentrically and falls freely, and along the height direction of the dropping section 520. The injection unit 530 having 531 is provided, and fine powder water is injected from the injection unit 530 to the free-falling powder mixture (bentonite mixed soil 700), thereby the powder mixture (bentonite mixed soil). 700) and water. At this time, the injection nozzle 531 is disposed at a position where the powder mixture (bentonite mixed soil 700) is sandwiched from inside and outside the concentric circle so that the powder mixture (bentonite mixed soil 700) during free fall is not scattered by the injection pressure of water. Then add water. Thereby, the powder mixture (bentonite mixed soil 700) that freely falls in the falling part 520 is added to a desired state.

<Mixture supply unit>
As shown in FIGS. 2 and 3, the powder mixture supply unit 510 includes a hopper 511 provided at the top of the dropping unit 520 and a quantitative supply device 514 provided at the bottom of the hopper 511. The hopper 511 may have any shape as long as the bentonite mixed soil 700 can be stored. In the present embodiment, the hopper 511 has a conical shape with a diameter reduced downward, and a discharge port is provided at the lower end. Note that the shape and capacity of the hopper 511 can be changed as appropriate according to the situation at the processing site, such as the processing amount of the powder mixture (bentonite mixed soil 700) to be hydrated.

<Quantitative supply device>
As shown in FIGS. 2 and 3, the fixed amount supply device 514 includes a screw conveyor 512 provided at a lower portion of the hopper 511, and a motor (not shown) for rotationally driving the rotating shaft of the screw conveyor 512. Furthermore, it is preferable to further include a stirring blade 513 for stirring the powder mixture (bentonite mixed soil 700) stored in the hopper 511. The stirring blade 513 is made of reiki attached to the stirring rotating shaft, and stirs the powder mixture (bentonite mixed soil 700) in the vicinity of the discharge port of the hopper 511 to the powder conveyor 512 (bentonite mixed soil). 700).

  In this fixed quantity supply device 514, by rotating the screw conveyor 512 at a constant speed, the powder mixture (bentonite mixed soil 700) stored in the hopper 511 is quantitatively discharged from the discharge port. The fixed amount supply device 514 is not limited to the screw conveyor 512 and its accessory devices, and any device that can supply a fixed amount of the powder mixture (bentonite mixed soil 700) can be a piston type, a diaphragm type, a plunger type, Any structure such as a snake type may be used.

  Although not shown, the hopper 511 is equipped with a measuring device (for example, a load cell) for measuring its weight (the weight of the stored powder mixture (bentonite mixed soil 700)). By this measuring device, the powder mixture (bentonite mixed soil 700) is quantitatively measured by continuously measuring the change in the weight of the powder mixture (bentonite mixed soil 700) and controlling the driving of the quantitative supply device 514. Can be supplied.

<Falling part>
As shown in FIGS. 2 and 3, the dropping unit 520 is a cylindrical member placed on a gantry, and a predetermined amount of water is added during the free fall of the powder mixture (bentonite mixed soil 700). Has a height that can be done. The shape, diameter, and height of the dropping part 520 can be appropriately changed according to the situation at the processing site, such as the processing amount of the powder mixture (bentonite mixed soil 700) to be subjected to the hydrotreatment.

<Diffusion device>
As shown in FIGS. 2 and 3, the diffusing device 521 is a cone-shaped member whose diameter is expanded downward, and is accommodated in a cylindrical diffusing portion 523 provided immediately below the powder mixture supply portion 510. Yes. The powder mixture (bentonite mixed soil 700) supplied from the powder mixture supply unit 510 spreads concentrically by the diffusion device 521, and freely falls within the dropping unit 520. In addition, a cylindrical skirt portion 522 is provided below the diffusion device 521 in order to spread the powder mixture (bentonite mixed soil 700) concentrically together with the diffusion device 521. That is, the powder mixture (bentonite mixed soil 700) falling from the outlet of the hopper 511 is spread concentrically by the cone-shaped diffusion device 521. At this time, the powder mixture (bentonite mixed soil 700) is diffused into the diffusion portion. A skirt portion 522 that functions as a buffer portion is provided in order to prevent the inner wall from bouncing and bouncing and spreading inward from the diameter of the diffusion device 521.

  The diffusion device 521 is not limited to the shape described above, and may have any shape as long as it can diffuse the falling powder mixture (bentonite mixed soil 700), depending on the shape of the dropping portion 520 and the like. And can be made into an appropriate shape. The skirt portion 522 is preferably detachable from the diffusion device 521 in order to facilitate maintenance and the like.

<Injection nozzle>
As shown in FIG. 3, the injection nozzle 531 is positioned on the inner side and the outer side of the powder mixture (bentonite mixed soil 700) that spreads concentrically and falls freely, and the circumferential direction and the height direction of the dropping part 520. Are arranged along the line. One end of a water supply pipe 540 is connected to each injection nozzle 531, and the other end of the water supply pipe 540 is connected to a compression pump 570. Then, the water stored in the water tank is compressed to a predetermined pressure by the compression pump 570 and supplied to the injection nozzle 531 through the water supply pipe 540, whereby fine particle (mist) water is ejected from the injection nozzle 531. In addition, the diameter of the water particle injected from the injection nozzle 531 of this embodiment is about 10 to 400 μm. Moreover, the pressure of the water to be injected is about 0.05 to 1.0 MPa.

  The injection unit 530 having the injection nozzle 531 is divided into two systems, ie, a substantially central part of the dropping part 520 and an outer peripheral part, and is arranged in multiple stages in the height direction (vertical direction) of the dropping part 520. The inner-system injection unit 530 has a plurality of stages (for example, 4 to 8 stages) in the height direction, and the injection units 530 of each stage are concentrically spaced from the center of the drop part 520 to the outside at equal intervals. A plurality of (for example, 4 to 8) injection nozzles 531 are attached to each other.

  On the other hand, each injection unit 530 in the outer system is arranged at a position facing each injection unit 530 in the inner system. That is, the injection part 530 having the injection nozzle 531 of the outer system is attached to the water supply pipes 540 having a plurality of stages (for example, 4 to 8 stages) in the height direction. A plurality of (for example, 4 to 8) injection nozzles 531 are attached to each stage of the water supply pipe 540 concentrically from the outside of the dropping part 520 toward the center. The direction of the injection nozzle 531 is preferably substantially horizontal so as not to diffuse the free-falling powder mixture (bentonite mixed soil 700). However, the spray nozzle 531 is uniformly added to the powder mixture (bentonite mixed soil 700). In some cases, it may be installed downward or upward.

  In the present embodiment, although not shown in detail, a plurality of dummy injection units 550 that perform injection equivalent to each injection unit 530, an injection unit 530, and a dummy injection unit, corresponding to the plurality of injection units 530, respectively. And a three-way valve 560 for switching between 550 and 550. The dummy injection unit 550 has substantially the same configuration as the injection unit 530.

  Then, the amount of water added can be adjusted by adjusting whether or not water is injected from the injection unit 530 for each injection unit 530. Specifically, the number of injection units 530 to be used may be adjusted by switching the three-way valve 560 provided in the water supply pipe 540 of each injection unit 530 and each dummy injection unit 550. By switching the three-way valve 560, water is injected from either one of the injection units 530 of each stage and the corresponding dummy injection unit 550 of each stage. Thus, since the head balance does not change by switching the water flow in the injection unit 530 to the dummy injection unit 550, pressure fluctuation and flow rate fluctuation in each injection unit 530 can be suppressed.

  The injection unit 530 of the present embodiment has a cylindrical water storage unit (in order to store water between the water supply pipe 540 and the injection nozzle 531 and make the water pressure and water amount injected from the injection nozzle 531 uniform. (Not shown). In order to inject (inject) the water stored in this water storage part directly from each injection nozzle 531, the fluid pressure and flow volume concerning each injection nozzle 531 become equal, and the water storage part with a large capacity is used. In addition, water flow turbulence (turbulent flow state) due to bending of the water supply pipe 540, head loss, etc. are unlikely to occur.

<Shoot>
At the bottom of the fluid mixing device (hydration device) 500, a chute for dropping the powder mixture after mixing (bentonite mixed soil 700) onto the belt conveyor 640 is provided. Although not shown, the chute is reduced in diameter toward the lower side, and the peripheral wall portion is formed by collecting strip-shaped plate members divided in the circumferential direction. In addition, a sliding member for smoothly dropping the powder mixture (bentonite mixed soil 700) is attached to the inner surface of the peripheral wall portion. Furthermore, a diameter expansion preventing member made of a ring-shaped member having elasticity is attached to the outer peripheral portion of the peripheral wall portion in order to prevent the powder mixture (bentonite mixed soil 700) from colliding and spreading the chute. Yes.

<Comparison with conventional technology>
In the conventional mechanical hydration / mixing method using a mixer, a stabilizer, etc., bentonite mixed soil and water are put into a stirrer, and mechanical force is applied by a stirring blade to stir and disperse. Water is brought into contact with the bentonite mixed soil. On the other hand, in the fluid mixing device (hydration device) 500 of the present invention, the mixing device 400 uniformly mixes sand and bentonite to obtain bentonite mixed soil 700, and further allows the bentonite mixed soil 700 to fall freely. Water is brought into contact with the bentonite mixed soil 700 by collision with water dispersed and sprayed in the form of fine particles. Therefore, since no compulsory force is applied to the bentonite mixed soil 700 with a stirring blade or the like, a dumpling-like lump (ball) is not generated, and a power mechanism such as a stirring blade or its rotating shaft is used. The problem that the mixed bentonite soil 700 adheres does not occur.

  Further, in order to uniformly add water to the bentonite mixed soil 700, it is an important point how to increase the contact area between the bentonite mixed soil 700 and water. In the conventional mechanical hydration / mixing apparatus, the bentonite mixed soil 700 and water are mechanically agitated and dispersed. However, in many cases, uniform hydration cannot be performed. On the other hand, in the fluid mixing device (hydration device) 500 of the present invention, the bentonite mixed soil 700 that freely falls is concentrically spread using a cone-shaped guide (diffusion device 521), and the soil particles are dispersed in the falling process. In addition, uniform water addition is realized by injecting water in multiple directions and in multiple stages from inside and outside of the bentonite mixed soil 700 spreading concentrically.

  Thus, since the fluid mixing apparatus (hydration apparatus) 500 of the powder mixture manufacturing apparatus 100 of the present invention does not exert a mechanical action on the bentonite mixed soil 700, the bentonite mixed soil 700 has a dumpling shape. It is possible to perform water addition that is homogeneous and has little variation without becoming a lump. Furthermore, there is no problem with the mechanical hydration / mixing method, such as deterioration in quality due to adhesion of bentonite mixed soil 700 to the device, and reduction in construction efficiency due to cleaning of the device, etc. Furthermore, since it is a simple device that does not involve a mechanical mechanism, it is inexpensive and has extremely excellent dust and vibration, so that it has an excellent advantage that mechanical troubles such as motor failure are unlikely to occur. Yes. In addition, since the powder mixture manufacturing apparatus 100 of this invention can be used when adding water with respect to powder or a granular material like cement or its mixed soil other than bentonite or bentonite mixed soil 700, it can be used. Similar effects can also be achieved with other powders or granules.

DESCRIPTION OF SYMBOLS 100 Powder mixture manufacturing apparatus 200 Base material supply apparatus 210 Base material hopper 300 Powder supply apparatus 310 Silo 320 Powder hopper 400 Mixing apparatus 410 Deformation path 420 Hopper 500 Fluid mixing apparatus 510 Mixture supply part 511 Hopper 512 Screw conveyor 513 Stirring blade 514 Fixed supply device 520 Falling part 521 Diffusion device 522 Skirt part 523 Diffusion part 530 Injection part 531 Injection nozzle 540 Water supply piping 550 Dummy injection part 560 Three-way valve 570 Compression pump 610, 620, 630, 640 Belt conveyor 700 Bentonite mixed soil 810 Mother Material (sand)
820 Powder (Bentonite)

Claims (2)

A powder mixture production apparatus for producing a powder mixture having a desired fluid content ratio by mixing a powder with a base material and adding a fluid, the base material supply apparatus and the powder supply apparatus And a mixing device and a fluid mixing device,
The base material supply device measures the fluid content ratio, measures the base material so as to become a powder mixture having a preset target fluid content ratio, and supplies quantitatively,
The powder supply device measures the fluid content ratio, measures the powder so as to become a powder mixture having a preset target fluid content ratio, and quantitatively supplies the powder mixture,
The mixing device includes a plurality of deformation passages arranged in parallel in the vertical direction. Each deformation passage has a cross-sectional shape that continuously changes from the inlet toward the outlet, and the inlet and outlet of each deformation passage. In the meantime, comprising a joining means for joining the base material and the powder passing through each deformation passage, and a dividing means for dividing the joined base material and the powder and flowing down to each deformation passage, Uniformly mixing the base material and the powder to produce the powder mixture,
The fluid mixing device includes: a powder mixture supply unit that quantitatively supplies the powder mixture; a dropping unit that freely drops the powder mixture; and a particulate fluid with respect to the powder mixture that freely falls Adding a fluid to the powder mixture by providing a spray unit having a plurality of spray nozzles to spray;
An apparatus for producing a powder mixture.   The apparatus for producing a powder mixture according to claim 1, wherein the base material is sand or gravel, and the powder is bentonite.

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