JP2013188944A - Manufacturing apparatus of powder mixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately measure moisture ratios of a matrix and powder and accurately supply the matrix and powder at a required dry weight ratio matched with the variation of the moisture states of the matrix and powder, and to accurately supply an amount of adding water reaching a target moisture ratio, matched with the variation of the moisture states of the matrix and powder.SOLUTION: The manufacturing apparatus of a powder mixture includes: a matrix fluid content ratio measuring means 1 and a powder fluid content ratio measuring means 4 continuously and automatically measuring the fluid contents of the matrix and the powder respectively; a matrix supply amount adjusting means 2, the matrix supply amount adjusting means 2, and a fluid supply amount adjusting means 8 adjusting supply amounts of the matrix, powder and fluid respectively based on the measured values in the respective measuring means; a matrix supply means 3 and a powder supply means 6 supplying the matrix and powder respectively; a mixing means 7 uniformly mixing the matrix and powder to form a powder mixture; and a fluid mixing means 9 adding the fluid to the powder mixture by injecting the fluid, while quantitatively supplying the powder mixture and making the powder mixture freely drop.

Description

  The present invention relates to an apparatus for producing a powder mixture, in which a base material (for example, sand or gravel) and a powder (for example, bentonite) are uniformly mixed, and a fluid (for example, water) is added to the desired fluid. The present invention relates to an apparatus for producing a powder mixture (for example, bentonite mixed soil) having a content ratio (water content ratio).

  Bentonite mixed soil, which is a powder mixture, is a mixture of sand or gravel and bentonite, and is used as a material for constructing a low water permeability layer of a waste disposal facility. In order for the 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 general that the bentonite mixed soil is wetted by adding appropriate water so that compaction can be easily performed.

  In the production of bentonite mixed soil, the bentonite addition rate and water content ratio, which affect the low water permeability after compacting the bentonite mixed soil, are important quality control items and must be managed accurately. is there.

  Conventionally, as a method of adding water to 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

  As described above, in the production of bentonite mixed soil, which is a powder mixture, it is important to manage the ratio of bentonite added to the base material (for example, sand or gravel) and the water content, and to manage these accurately. Need to solve the following problems.

  First, the moisture content of the base material (sand or gravel) and bentonite is accurately measured, and the base material (sand or gravel) and bentonite are adjusted according to the change in the water content of the base material (sand or gravel) and bentonite. It is necessary to supply accurately at the required dry weight ratio. In order to quantitatively supply the base material (sand or gravel) and bentonite, a commercially available quantitative supply device (for example, a loss-in-weight type quantitative supply device) is used. This quantitative supply device measures the wet weight in real time using a load cell, calculates the dry weight based on the moisture content ratio of the base material (sand or gravel) and bentonite measured in advance, and both become a constant ratio. In such a manner (or a dry weight per unit time), the speed of the conveyor is automatically adjusted by PI control, and the base material (sand or gravel) and bentonite are supplied. However, it is also true that many quantitative supply devices that are generally available on the market have many measurement errors due to differences in mechanism, control method, and method.

  Since the moisture content of the base material (sand or gravel) generally varies with time even during one day of construction, the moisture content of the base material (sand or gravel) that was originally supplied is measured in real time. Thus, it is desirable to reflect this in the calculated dry weight value in real time. However, measurement of the water content ratio takes 1 day for the oven drying method of the Geotechnical Society standard, and about 15 minutes for the microwave oven method, and it takes time for measurement. In many cases, the moisture content is measured about 2 to 4 times, and the dry weight is calculated from the wet weight using this.

  And when the fluctuation | variation of the moisture content of a base material (sand or gravel) is large, even if it measures a wet weight correctly using a load cell, the difference | error of the calculation value of the important dry weight will become large. Generally, in the case of bentonite mixed soil used as a material for constructing a low water permeable layer, low water permeability may not be satisfied unless the bentonite addition rate is ensured more than necessary. Therefore, the compounding ratio (dry weight ratio) between the base material (sand or gravel) and bentonite is an important quality control index, but when the amount of dry weight discharge error is expected to be large due to fluctuations in the water content ratio. In order to prevent the added amount of bentonite from breaking the design value, a method of increasing the added amount of bentonite is employed. Thus, the method of increasing the amount of bentonite added has a problem that the material cost increases.

  Secondly, the water content of the base material (sand or gravel) and bentonite is accurately measured, and the amount of water that reaches the target water content is accurately adjusted according to changes in the water content of the base material (sand or gravel) and bentonite. Need to supply. In the case of bentonite mixed soil, in order to perform the required water addition, the amount of water required to reach the target water content is determined based on the measured value of the water content of the base material (sand or gravel) and bentonite before mixing. This is added to bentonite mixed soil. Therefore, it is necessary to accurately measure the moisture content of the base material (sand or gravel) and bentonite in order to add water accurately so as to achieve the target moisture content.

  However, the base material (sand or gravel) quantitative supply device and bentonite quantitative supply device currently on the market have measurement errors in terms of mechanism and control. However, the measurement error is within a predetermined arbitrary width (can be controlled and managed with a predetermined arbitrary width). In addition, a commercially available quantitative supply device requires a certain amount of time after startup until it can be managed and stably operated with an arbitrary control width, and the material supplied during that time has a desired quality (for example, a mixing ratio). ) Cannot be satisfied, and not only the waste increases but also the manufacturing cost increases. Therefore, continuous operation without stopping the quantitative supply device leads to efficiency and cost reduction.

  In the techniques described in Patent Document 1 and Patent Document 2 described above, the moisture content of the base material (sand or gravel) and bentonite is accurately measured, and the moisture content of the base material (sand or gravel) and bentonite is adjusted to the fluctuation. To accurately supply the base material (sand or gravel) and bentonite at the required dry weight ratio, and accurately measure the water content of the base material (sand or gravel) and bentonite to reach the target water content ratio No consideration is given to supplying the amount of water accurately in accordance with changes in the moisture content of the base material (sand or gravel) and bentonite.

  Such a problem is not limited to bentonite mixed soil, but should be widely considered when a powder mixture is produced by mixing other types of base materials and powder.

  The present invention has been proposed in view of the above-described circumstances, and continuously and accurately measures the fluid content ratio (water content ratio) of the base material (for example, sand or gravel) and powder (bentonite), and the base material ( For example, the base material (for example, sand or gravel) and the powder (for example, bentonite) are required to be dried in accordance with the change in the fluid content (water content) of the sand or gravel) and the powder (for example, bentonite). It is an object of the present invention to provide an apparatus for producing a powder mixture (for example, bentonite mixed soil) that can be supplied accurately in a weight ratio. Further, the present invention continuously and accurately measures the fluid content ratio (water content ratio) of the base material (for example, sand or gravel) and powder (for example, bentonite) to obtain the target fluid content ratio (target water content ratio). Powder that can accurately supply the amount of fluid mixed in (water content) according to fluctuations in the fluid content (moisture content) of the base material (eg, sand or gravel) and powder (eg, bentonite) It aims at providing the manufacturing apparatus of a mixture (for example, bentonite mixed soil).

  The powder mixture manufacturing apparatus of the present invention has the following features in order to achieve the above-described object. That is, the apparatus for producing a powder mixture of the present invention mixes powder (for example, bentonite) with a base material (for example, sand or gravel) and adds a fluid (for example, water) to contain a desired fluid. The present invention relates to a powder mixture production apparatus for producing a powder mixture (for example, bentonite mixed soil) having a ratio (water content ratio).

  The powder mixture manufacturing apparatus of the present invention comprises a base material fluid content ratio measuring means for continuously and automatically measuring the fluid content ratio of the base material, and a preset target fluid based on the measured fluid content ratio of the base material. A base material supply amount adjusting means for adjusting the base material supply amount so as to be a powder mixture of the content ratio, a base material supply means for supplying the base material so as to be an adjusted base material supply amount, and a pre-measurement Based on the fluid content ratio of the powder, the powder supply amount adjusting means for adjusting the powder supply amount so as to obtain a powder mixture having a preset target fluid content ratio, and the adjusted powder supply amount A powder supply means for supplying powder to the liquid, a mixing means for uniformly mixing the base material and the powder to generate a powder mixture, and a fluid so as to obtain a powder mixture having a preset target fluid content ratio. Fluid supply amount adjustment means for adjusting the supply amount, and free fall while quantitatively supplying the powder mixture By and is characterized by comprising a fluid mixing means for adding fluid to the powder mixture by injecting a regulated fluid supply amount of the fluid.

  Further, in addition to the above-described configuration, a powder fluid content ratio measuring unit that continuously and automatically measures the powder fluid content ratio is provided, and the powder supply amount adjusting unit is based on the measured fluid content ratio of the powder. The powder supply amount is adjusted so that a powder mixture having a preset target fluid content ratio is obtained, and the powder supply means is configured to supply the powder so that the adjusted powder supply amount is obtained. Is possible.

  The powder mixture manufacturing apparatus of the present invention can be suitably applied to a bentonite mixture manufacturing apparatus that uses sand or gravel as a base material and bentonite as a powder to manufacture bentonite mixed soil. it can.

  According to the powder mixture manufacturing apparatus of the present invention, the fluid content ratio (water content ratio) of the base material (for example, sand or gravel) and the powder mixture (for example, bentonite mixed soil) after adding the fluid (after addition). ) To continuously and automatically measure the fluid content ratio (water content ratio) and adjust the supply amount of the base material (eg, sand or gravel) and powder (eg, bentonite) and the amount of mixed fluid (water content). By this, a powder mixture (for example, bentonite mixed soil) that matches a desired fluid content ratio (water content ratio) can be produced. Therefore, it is possible not only to produce high-quality powder mixtures (eg bentonite mixed soil), but also to reduce production costs because there is no need to use waste materials by properly managing the material supply. It becomes.

The functional block diagram of the manufacturing apparatus of the powder mixture which concerns on embodiment of this invention. The schematic diagram of the bentonite mixed-soil manufacturing apparatus which applies the manufacturing apparatus of the powder mixture which concerns on embodiment of this invention. The schematic diagram of the water addition apparatus which applies the manufacturing apparatus of the powder mixture which concerns on embodiment of this invention.

  Hereinafter, an embodiment of an apparatus for producing a powder mixture according to the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram of a powder mixture production apparatus according to an embodiment of the present invention, FIG. 2 is a schematic diagram of a bentonite mixed earth production apparatus to which the powder mixture production apparatus can be applied, and FIG. It is a schematic diagram of the water addition apparatus which can apply a manufacturing apparatus.

  In the following description, sand is described as a representative example of the base material. However, the base material to which the present invention is applied is not limited to this, and other base materials such as gravel can also be applied. In this case, sand or gravel may be used alone as a base material, or a mixture of sand and gravel may be used. Moreover, although bentonite is demonstrated as a typical example of powder, the powder which applies this invention is not restricted to this, It can apply also to other powders like cement. The powder targeted in 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. That is, sand is given as a specific example of the base material, bentonite is given as a specific example of the powder, and water is given as a specific example of the fluid, but the base material, powder, and fluid to which the present invention is applied are: However, it is not limited to these.

<Outline of powder mixture manufacturing equipment>
A powder mixture production apparatus 10 according to an embodiment of the present invention is an apparatus for producing bentonite mixed soil having a desired water content by mixing bentonite with sand or gravel and adding water. 1, the base material fluid content ratio measuring means 1, the base material supply amount adjusting means 2, the base material supply means 3, the powder supply amount adjusting means 5, the powder supply means 6, and the mixing means 7, a fluid supply amount adjusting means 8, and a fluid mixing device 90. Further, in addition to these means, it is possible to adopt a configuration provided with the powder fluid content ratio measuring means 4.

  As shown in FIG. 2, the specific apparatus configuration includes a base material supply device 30 that is the base material supply means 3, a powder supply device 60 that is the powder supply means 6, and a mixing device 70 that is the mixing means 7. And a fluid mixing device (hydration device) 90 as the fluid mixing means 9, and as means for controlling these devices, the base material fluid content ratio measuring means 1, the base material supply amount adjusting means 2, , A powder fluid content ratio measuring means 4, a powder supply amount adjusting means 5, and a fluid supply amount adjusting means 8. The powder fluid content ratio measuring means 4 is a means required when the powder fluid content ratio is not stable. Hereinafter, each device and means will be described.

  The base material fluid content ratio measuring means 1, the base material supply amount adjusting means 2, the powder fluid content ratio measuring means 4, the powder supply amount adjusting means 5, and the fluid supply amount adjusting means 8 are electronic devices and their attached devices. And calculating means for calculating the measured value and the supply amount, each calculating means is composed of a personal computer or the like, and the CPU or the like operates according to a predetermined program so as to exert its function. It has become. A program is a concept that includes not only software that exhibits its function but also a logic circuit that can exhibit an equivalent function by being stored in a RAM or the like and executed by hardware such as a CPU. It is.

<Base material supply device>
The base material supply device 30 is a device for measuring and quantitatively supplying sand or gravel whose water content ratio has been continuously and automatically measured so as to be a bentonite mixed soil having a preset target water content ratio. As shown in FIG. 2, the base material supply device 30 includes a base material hopper 31 that receives sand or gravel, and a base material quantitative supply device 32 that quantitatively supplies sand or gravel. The base material hopper 31 is a device for temporarily storing sand or gravel, and the sand or gravel stored in the base material hopper 31 is quantitatively supplied by a base material quantitative supply device 32. Sand or gravel is supplied to the base material hopper 31 from an opening provided in the upper part. Specifically, sand or gravel is thrown into the base material hopper 31 from the opening using a heavy machine such as a power shovel. In addition, a belt conveyor 110 is installed below the base material hopper 31, and the quantitatively supplied sand or gravel is conveyed toward the powder supply device 60 by the belt conveyor 110.

  The base material hopper 31 is attached with a base material measuring device 33 (for example, a load cell) for measuring its weight (the weight of stored sand or gravel). By changing the weight of the sand or gravel continuously by the base material measuring device 33 and controlling the drive of the base material quantitative supply device 32 by the base material supply amount adjusting means 2, the sand or gravel is quantitatively measured. Can be supplied to.

  The base material quantitative supply device 32 includes, for example, a screw conveyor and a motor for rotationally driving the rotating shaft of the screw conveyor. The base material constant supply device 32 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 may be used.

Moreover, in this embodiment, the base material fluid content ratio measuring means 1 for continuously and automatically measuring the water content ratio of sand or gravel is provided. For example, a continuous RI (Radio Isotope) moisture meter can be used as the base material fluid content ratio measuring means 1. The RI moisture meter detects neutrons that have passed through a measurement object (sand or gravel) between a neutron source and a detector (for example, a ³ He proportional counter), and fast neutrons are converted into thermal neutrons. This is a device that measures the moisture content of the measurement object using the principle that the hydrogen nucleus density in the measurement object part can be estimated based on the ratio (or the ratio of fast neutrons that are not converted into thermal neutrons). That is, although not shown, the RI moisture meter includes a neutron source (eg, ²⁵² C) that emits neutron rays, a detection unit (eg, ³ He proportional counter) that detects neutron rays that have passed through the measurement object, A calculation unit that calculates the water content (water content ratio) of the measurement object based on the neutron dose detected by the detection unit.

  The base material fluid content ratio measuring means 1 is not limited to the RI moisture meter, and any device may be used as long as the fluid content ratio contained in the base material can be continuously and automatically measured.

  In the base material supply device 30 having the above-described configuration, the base material fluid content ratio measuring means 1 measures the base material weight by the base material weighing device 33 while continuously and automatically measuring the water content ratio of the base material. The supply amount adjusting means 2 performs drive control of the base material fixed amount supply device 32 to adjust the supply amount of the base material.

<Powder supply device>
The powder supply device 60 is a device for measuring and quantitatively supplying bentonite whose water content ratio is continuously and automatically measured so as to be a bentonite mixed soil having a preset target water content ratio. The powder supply device 60 includes a silo 61 for storing bentonite, a powder hopper 62 for receiving bentonite stored in the silo 61, and a powder quantitative supply device 63 for quantitatively supplying bentonite. ing. The silo 61 is a device for preventing as much as possible the influence of outside air humidity on the bentonite, and an appropriate weight of bentonite is stored in the silo 61. The bentonite stored in the silo 61 is supplied to the powder hopper 62 by a transport device such as a powder pump. The powder hopper 62 is an apparatus for temporarily storing bentonite, and the bentonite stored in the powder hopper 62 is quantitatively supplied by a powder quantitative supply device 63. A belt conveyor 120 is installed below the powder hopper 62, and bentonite supplied quantitatively is mixed with sand or gravel on the belt conveyor 120 and conveyed toward the mixing device 70. .

  A powder weighing device 64 (for example, a load cell) for weighing the weight (the weight of the stored bentonite) is attached to the powder hopper 62. The bentonite can be quantitatively supplied by continuously measuring the weight change of bentonite by the powder measuring device 64 and controlling the driving of the powder quantitative supply device 63 by the powder supply amount adjusting means 5. it can.

  The powder fixed quantity supply device 63 is composed of, for example, a screw conveyor and a motor for rotationally driving the rotating shaft of the screw conveyor. The base material constant supply device 32 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 may be used.

  As the powder fluid content ratio measuring means 4 for continuously and automatically measuring the water content ratio of bentonite, for example, the above-described RI moisture meter can be used. The powder fluid content ratio measuring means 4 is not limited to the RI moisture meter, and may be any device as long as it can continuously and automatically measure the content ratio of the fluid contained in the base material.

  In the powder supply device 60 having the above-described configuration, while the moisture content ratio of the bentonite is continuously and automatically measured by the powder fluid content ratio measuring means 4, the bentonite weight is measured by the powder metering device 64, and the powder supply amount is measured. The adjusting unit 5 controls the drive of the powder quantitative supply device 63 to adjust the powder supply amount.

  If the fluctuation of the moisture content of the powder is very small, the powder fluid content ratio measuring means 4 can be omitted. In this case, for example, the moisture content of bentonite is measured at an appropriate time using an infrared moisture meter. In other words, bentonite is delivered in a tank truck or a moisture-proof bag and stored in a silo that is not easily affected by the external environment, so there is no need to frequently measure the moisture content. Can be assumed to be correct. On the other hand, when the fluctuation of the moisture content of the powder is expected, it is preferable to provide the powder fluid content ratio measuring means 4.

<Mixing device>
As shown in FIG. 2, the mixing device 70 includes a plurality of deformation passages 71 arranged in the vertical direction. Each deformed passage 71 has a continuously changing cross-sectional shape from the inlet to the outlet, and sand or gravel and bentonite passing through each deformed passage 71 join between the inlet and the outlet of each deformed passage 71. And a dividing portion that divides the joined sand or gravel and bentonite and flows down to the respective deformation passages 71, thereby repeating the merging and dividing of the sand or gravel and bentonite to make the sand or gravel and bentonite uniform. The bentonite mixed soil can be produced. A hopper is provided at the uppermost part of the deformation passage 71 and receives sand or gravel and bentonite conveyed on the belt conveyor 120 and drops them into the deformation passage 71.

  The mixing device 70 can use, for example, a technique relating to “kneading method and device” described in Japanese Patent No. 2975891. In order to mix sand or gravel and bentonite using the mixing device 70 having such a configuration, the sand or gravel and bentonite having fluidity are fed from the inlets of the respective deformation passages 71 so as to feed the sand or gravel and bentonite. Mixing is promoted by continuously changing the cross-sectional shape of the bentonite mixed soil, which is a mixture of the above. And, in the middle of the mixing process, the step of joining the sand or gravel and bentonite flowing in each deformation passage 71, the step of dividing the joined sand or gravel and bentonite and flowing them to each deformation passage 71, and each deformation passage And a step of shifting the timing at which sand or gravel and bentonite flowing in 71 join each other.

  A belt conveyor 130 is disposed below the mixing device 70, and the bentonite mixed soil 200 is conveyed to the upper portion of the fluid mixing device 90 by the belt conveyor 130. The mixing device 70 may also include a fluid content ratio measuring means (for example, an RI moisture meter) for measuring the fluid content ratio (water content ratio) of the supplied powder mixture (bentonite mixed soil 200). Good.

<Fluid mixing device>
2 and 3, the fluid mixing device 90 includes a mixture supply unit 91 that quantitatively supplies the bentonite mixed soil 200, a dropping unit 92 that freely drops the powder mixture, and a bentonite mixed soil that freely falls. 200 is an apparatus for adding fluid (adding water) to the bentonite mixed soil 200 by including an injection section 93 having a plurality of injection nozzles 93a for injecting (spraying) fine particle fluid (water) onto 200. Yes, this embodiment is a water addition device.

  Specifically, as shown in FIG. 3, the fluid mixing device (hydration device) 90 includes a substantially cylindrical drop unit 92, and the mixture supply unit 91 is disposed above the drop unit 92. . The mixture supply unit 91 of the present embodiment includes a hopper 91a, a powder mixture fixed amount supply device 91d having a screw conveyor 91b, a stirring blade 91c, and the like, and the bentonite mixed soil 200 kneaded in the mixing device 70. The bentonite mixed soil 200 is stored in the hopper 91a and quantitatively dropped into the dropping unit 92 by the powder mixture quantitative supply device 91d. The dropping unit 92 is provided with a diffusing device 94 so as to be positioned immediately below the hopper 91a. By the diffusing device 94, the bentonite mixed soil 200 spreads concentrically and falls vertically in the dropping unit 92. .

  The dropping part 92 has a plurality of injection nozzles 93a so as to be located inside and outside the bentonite mixed soil 200 that is concentrically spread and freely falls, and along the height direction of the dropping part 92. 93 is provided, and the bentonite mixed soil 200 and water are brought into contact with each other by spraying (spraying) particulate water onto the bentonite mixed soil 200 that freely falls. At this time, in order to prevent the bentonite mixed soil 200 during free fall from scattering due to the spray pressure of water, the spray nozzle 93a performs water addition by placing the bentonite mixed soil 200 from the inside and outside of the concentric circles. Thereby, the bentonite mixed soil 200 that freely falls in the falling portion 92 is hydrated until it reaches a desired state.

<Mixture supply unit>
As shown in FIG. 3, the mixture supply unit 91 includes a hopper 91a provided at the upper part of the dropping unit 92 and a powder mixture quantitative supply device 91d provided at the lower part of the hopper 91a. The hopper 91a may have any shape as long as the bentonite mixed soil 200 can be stored. In the present embodiment, the hopper 91a has a conical shape whose diameter is reduced downward, and a discharge port is provided at a lower end portion. In addition, the shape and capacity | capacitance of the hopper 91a can be suitably changed according to the condition of a processing field, such as the processing amount of the bentonite mixed soil 200 which performs a water treatment.

<Powder mixture quantitative supply device>
As shown in FIG. 3, the powder mixture fixed amount supply device 91d includes a screw conveyor 91b provided at the lower portion of the hopper 91a and a motor (not shown) for rotating the rotation shaft of the screw conveyor 91b. Furthermore, it is preferable to provide a stirring blade 91c for stirring the bentonite mixed soil 200 stored in the hopper 91a. The stirring blade 91c is made of reiki attached to the stirring rotating shaft, and is a member for stirring the bentonite mixed soil 200 near the discharge port of the hopper 91a and stably supplying the bentonite mixed soil 200 to the screw conveyor 91b. is there.

  In the powder mixture quantitative supply device 91d, the bentonite mixed soil 200 stored in the hopper 91a is quantitatively discharged from the discharge port by rotating the screw conveyor 91b at a constant speed. The powder mixture quantitative supply device 91d is not limited to the screw conveyor 91b and its attached devices, and any device that can supply the bentonite mixed soil 200 in a fixed amount is a piston type, a diaphragm type, a plunger type, a snake type. Any structure may be used.

  A powder mixture weighing device 95 (for example, a load cell) for weighing the weight (the weight of the stored bentonite mixed soil 200) is attached to the hopper 91a. By this powder mixture metering device 95, the change in the weight of the bentonite mixed soil 200 is continuously measured and the drive of the powder mixture quantitative supply device 91d is controlled, whereby the bentonite mixed soil 200 is quantitatively supplied. Can do.

<Falling part>
As shown in FIG. 3, the dropping portion 92 is a cylindrical member placed on a gantry and has a height that allows a predetermined amount of water to be added while the bentonite mixed soil 200 is freely dropped. doing. The shape, diameter, and height of the dropping portion 92 can be changed as appropriate according to the situation at the processing site, such as the amount of bentonite-mixed soil 200 that is subjected to the hydrotreatment.

<Diffusion device>
As shown in FIG. 3, the diffusing device 94 is a cone-shaped member whose diameter is expanded downward, and is accommodated in a cylindrical diffusing portion 96 provided immediately below the mixture supply portion 91. The bentonite mixed soil 200 supplied from the mixture supply unit 91 spreads concentrically by the diffusion device 94 and freely falls in the dropping unit 92. In addition, a cylindrical skirt portion 94 a is provided below the diffusion device 94 in order to spread the bentonite mixed soil 200 concentrically with the diffusion device 94. That is, the bentonite mixed soil 200 falling from the discharge port of the hopper 91a is spread concentrically by the cone-shaped diffusion device 94. At this time, the bentonite mixed soil 200 collides with the inner wall of the diffusion portion and rebounds. In order to prevent the inner diameter from spreading beyond the diameter of 94, a skirt portion 94a that functions as a buffer portion is provided.

  The diffusion device 94 is not limited to the shape described above, and may have any shape as long as the falling bentonite mixed soil 200 can be diffused, and may have an appropriate shape according to the shape of the dropping portion 92 and the like. can do. The skirt portion 94a is preferably detachable from the diffusion device 94 in order to facilitate maintenance and the like.

<Injection nozzle>
As shown in FIG. 3, a plurality of the injection nozzles 93 a are arranged along the circumferential direction and the height direction of the dropping portion 92 so as to be positioned inside and outside the bentonite mixed soil 200 that concentrically expands and freely falls. Has been. One end of a water supply pipe 97 is connected to each injection nozzle 93 a, and the other end of the water supply pipe 97 is connected to a compression pump 98. Then, the water stored in the water tank is compressed to a predetermined pressure by the compression pump 98 and supplied to the injection nozzle 93a via the water supply pipe 97, whereby fine particle (mist) water is ejected from the injection nozzle 93a. In addition, the diameter of the water particle injected from the injection nozzle 93a of this embodiment is about 10-400 micrometers. Moreover, the pressure of the water to be injected is about 0.05 to 1.0 MPa.

  The injection section 93 having the injection nozzle 93a is divided into two systems, ie, a substantially central portion of the drop portion 92 and an outer peripheral portion, and is arranged in multiple stages in the height direction (vertical direction) of the drop portion 92. The injecting part 93 of the inner system has a plurality of stages (for example, 4 to 8 stages) in the height direction, and the injecting parts 93 of each stage are concentrically spaced outward from the center of the dropping part 92 at equal intervals. A plurality of (for example, 4 to 8) injection nozzles 93a are attached to the nozzle.

  On the other hand, each injection unit 93 in the outer system is arranged at a position facing each injection unit 93 in the inner system. That is, the injection part 93 having the injection nozzle 93a of the outer system is attached to the water supply pipe 97 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 93a are attached to each stage of the water supply pipe 97 at concentric circles from the outside of the drop portion 92 toward the center. The direction of the injection nozzle 93a is preferably substantially horizontal so as not to diffuse the free-falling powder mixture (bentonite mixed soil 200), but the water is uniformly added to the powder mixture (bentonite mixed soil 200). 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 93b that perform injection equivalent to each of the injection units 93, an injection unit 93, and a dummy injection unit, corresponding to the plurality of injection units 93, respectively. And a three-way valve 93c for switching to 93b. The dummy injection unit 93b has substantially the same configuration as the injection unit 93.

  The amount of water added can be adjusted by adjusting whether or not water is injected from the injection unit 93 for each injection unit 93 at each stage. Specifically, the number of stages of the injection units 93 to be used may be adjusted by switching the three-way valve 93c provided in the water supply pipe 97 of each injection unit 93 and each dummy injection unit 93b. By switching the three-way valve 93c, water is injected from either one of the injection sections 93 of each stage and the corresponding dummy injection section 93b of each stage. Thus, since the head balance does not change by switching the flow of water in the injection unit 93 to the dummy injection unit 93b, pressure fluctuations and flow rate fluctuations in each injection unit 93 can be suppressed.

  The injection unit 93 of the present embodiment has a cylindrical water storage unit (in order to store water between the water supply pipe 97 and the injection nozzle 93a and make the water pressure and the amount of water injected from the injection nozzle 93a uniform. (Not shown). In order to inject (inject) the water stored in this water storage part directly from each injection nozzle 93a, the fluid pressure and the flow volume concerning each injection nozzle 93a become equal, and by using a large capacity water storage part In addition, water flow turbulence (turbulent flow state) due to bending of the water supply pipe 97, head loss, and the like are unlikely to occur.

  In the fluid mixing device 90 having the above-described configuration, the fluid supply amount adjusting means 8 performs opening / closing control of the three-way valve 93c to adjust whether or not the water is injected from the injection unit 93, or a water amount valve (not shown). The amount of water supplied is adjusted by adjusting the opening degree of) and adjusting the amount of water to be injected. The fluid mixing device 90 is also provided with a fluid content ratio measuring means (for example, an RI moisture meter) for measuring the fluid content ratio (water content ratio) of the powder mixture after the addition (bentonite mixed soil 200). Also good.

<Shoot>
A chute for dropping the hydrated bentonite mixed soil 200 onto the belt conveyor 140 is provided at the lowermost part of the fluid mixing device 90 (hydration device). It is transferred to an appropriate transport location.

  This powder mixture manufacturing apparatus is roughly divided into four steps. That is, the powder mixture manufacturing apparatus of the present embodiment includes a base material supply step (sand weighing / supplying step), a powder supply step (bentonite weighing / supplying step), and a mixing step (sand and bentonite mixing step). , Fluid mixing step (including a hydration step for bentonite mixed soil.

<Base material supply process>
In the base material supply process, the water content ratio of the sand or gravel is continuously and automatically measured by the base material fluid content ratio measuring means 1, and the base material quantitative supply device 32 is controlled by the base material supply amount adjusting means 2 and set in advance. Sand or gravel is quantitatively supplied so as to be a bentonite mixed soil having a target water content ratio.

<Powder supply process>
In the powder supply process, the moisture content ratio of bentonite is continuously measured by the powder fluid content ratio measuring means 4, and the powder mixture quantitative supply device 91 d is controlled by the powder supply amount adjusting means 5 to set a preset target. Bentonite is supplied quantitatively so that it becomes a bentonite mixed soil with a water content.

<Mixing process>
In the mixing step, sand or gravel and bentonite are uniformly mixed to generate bentonite mixed soil. The mixing apparatus 70 of this embodiment includes a plurality of deformation passages 71 arranged in the vertical direction, and the cross-sectional shape of each deformation passage 71 is continuously changed from the inlet toward the outlet. Furthermore, sand or gravel and bentonite are obtained by repeating the step of joining sand or gravel and bentonite between the inlet and outlet of each deformation passage 71 and the step of dividing the joined sand or gravel and bentonite. Uniform mixing is possible.

<Fluid mixing process>
In the fluid mixing step, the bentonite mixed soil 200 mixed in the mixing step is supplied to the bentonite mixed soil 200 by being freely dropped while being quantitatively supplied and spraying (spraying) particulate water. At this time, the amount of water added can be adjusted by the fluid supply amount adjusting means 8 to produce the bentonite mixed soil 200 having a target water content ratio.

DESCRIPTION OF SYMBOLS 10 Powder mixture manufacturing apparatus 1 Base material fluid content ratio measurement means 2 Base material supply amount adjustment means 3 Base material supply means 4 Powder fluid content ratio measurement means 5 Powder supply amount adjustment means 6 Powder supply means 7 Mixing means 8 Fluid supply amount adjusting means 9 Fluid mixing means 30 Base material supply device 31 Base material hopper 32 Base material quantitative supply device 33 Base material weighing device 60 Powder supply device 61 Silo 62 Powder hopper 63 Powder quantitative supply device 64 Powder measurement Equipment 70 Mixing equipment 71 Deformation passage 90 Fluid mixing equipment (hydration equipment)
91 Mixing unit 91a Hopper 91b Screw conveyor 91c Stirring blade 91d Powder mixture fixed amount supply device 92 Dropping unit 93 Injection unit 93a Injection nozzle 93b Dummy injection unit 93c Three-way valve 94 Diffusion device 94a Skirt unit 95 Powder mixture measurement device 96 Diffusion unit 97 Water supply piping 98 Compression pump 110, 120, 130, 140 Belt conveyor 200 Bentonite mixed soil

Claims (3)

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,
A base material fluid content ratio measuring means for continuously and automatically measuring the fluid content ratio of the base material;
Based on the fluid content ratio measurement value of the base material, a base material supply amount adjusting means for adjusting the base material supply amount so as to become a powder mixture having a preset target fluid content ratio;
A base material supply means for supplying a base material so as to have the adjusted base material supply amount;
A powder supply amount adjusting means for adjusting a powder supply amount so as to be a powder mixture having a target fluid content ratio set in advance based on the fluid content ratio of the powder measured in advance;
Powder supply means for supplying powder so as to have the adjusted powder supply amount;
Mixing means for uniformly mixing the base material and the powder to produce a powder mixture;
Fluid supply amount adjusting means for adjusting the fluid supply amount so as to be a powder mixture having a preset target fluid content ratio;
Fluid mixing means for adding fluid to the powder mixture by spraying the adjusted fluid supply amount of fluid while allowing the powder mixture to fall freely while quantitatively supplying the powder mixture;
An apparatus for producing a powder mixture, comprising: A powder fluid content ratio measuring means for continuously and automatically measuring the fluid content ratio of the powder is provided.
The powder supply amount adjusting means adjusts the powder supply amount so as to be a powder mixture having a preset target fluid content ratio based on the fluid content ratio measurement value of the powder,
The apparatus for producing a powder mixture according to claim 1, wherein the powder supply means supplies the powder so that the adjusted powder supply amount is obtained. The base material is sand or gravel,
The apparatus for producing a powder mixture according to claim 1 or 2, wherein the powder is bentonite.

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