JP3777740B2 - Continuous mixing system for powder materials - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a powder material continuous mixing system, and in particular, a continuous powder material including a powder dropping unit that drops powder and a mixing device that includes a nozzle that causes a pressure liquid to collide with the falling powder. Relates to mixing systems.
[0002]
[Prior art]
For example, in continuous underground wall construction and shield construction methods, bentonite, CMC and various polymer materials are dissolved in water and other liquids near the construction site to promote fluidization of ground stabilization liquid and excavated soil. There are many cases of using as a material. There is also a great demand for mixing powder with liquid in the food field, chemical field, and other industrial fields. When these powder materials are dissolved or mixed in water or other liquids, conventionally called so-called batch processing, the liquid and powder materials are put into a water tank so as to have a required mixing ratio, and stirring blades are used. For example, a solution or a dispersion liquid mixture was prepared by forcibly stirring and mixing.
[0003]
[Problems to be solved by the invention]
However, the conventional method tends to cause secondary agglomeration called “dama” which encloses the aggregate of powder with a water film and is difficult to uniformly disperse. However, the agitation blade and the motor for driving the rotation of the agitation blade need to be enlarged and strengthened.
[0004]
Moreover, due to partial uneven distribution such as concentration and consistency due to secondary aggregation, the quality is difficult to stabilize, and much effort is required to maintain the quality constant.
[0005]
Furthermore, since it is a batch processing method, the production amount per time is determined according to the capacity of a liquid tank such as a water tank, and it is necessary to increase the size when dealing with continuous mass use at the time of construction. However, since the size and capacity are limited, a plurality of devices are required in preparation for such a case, and there is a drawback that a large installation space is occupied.
[0006]
In order to eliminate this type of defect, for example, as disclosed in Japanese Patent Laid-Open No. 6-57004, while the powder material is falling, a water film by pressure water is continuously supplied while intersecting the powder material, and is stored in the lower part. A method of dropping and storing the container together with water has been developed.
[0007]
A mixing device used in such a method is provided with a powder dropping unit for dropping powder and a nozzle for causing pressure water to collide with the falling powder, and is dropped as a mixed liquid while mixing the pressure water and the powder. In spite of a simple configuration, a large amount of powder material can be easily and continuously mixed, and furthermore, the system can control the supply amount of powder material and water to automate the mixing operation. Development is desired.
[0008]
The present invention solves the above-mentioned problems, and an object of the present invention is to provide a powder material capable of easily automating the mixing operation of the powder material and the liquid by a mixing device having a simple configuration. It provides a continuous mixing system.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a continuous mixing system for powder material according to the present invention includes a powder dropping part for dropping powder and a nozzle for causing a pressure liquid to collide with the falling powder. A mixing device that drops the mixture as a mixed solution while mixing, a storage tank that stores the mixed solution obtained by the mixing device, and a powder dropping unit of the mixing device that supplies the powder to the powder dropping unit Therefore, a powder feeder provided with a powder level meter, a powder supply device for supplying powder to the powder feeder, and a pressure liquid for supplying pressure liquid to the mixing device are disposed above the mixing device. a supply pump based on the detection result by the liquid level meter and the powder level meter, the powder feeder, with on-off controlling said powder supplying device and the pressure fluid supply pump, and the pressure fluid and said powder During mixing , It is characterized in that these and a control means for controlling driving and the pressure fluid supply pump and said powder feeder as mixed at a preset mixing ratio.
The powder material continuous mixing system of the present invention includes a powder dropping unit for dropping powder and a nozzle for causing the pressure liquid to collide with the falling powder, and the mixed liquid while mixing the pressure liquid and the powder. A mixing device to be dropped, a storage tank having a liquid level meter for storing the liquid mixture obtained by the mixing device, and an upper portion of the mixing device to supply powder to a powder dropping unit of the mixing device is disposed, and the powder feeder provided with a powder level meter, and the powder feeder powder supply device for supplying powder to a pressure liquid supply pump for supplying pressure fluid to the mixing device, the liquid A powder material continuous mixing system comprising: a level meter or a control means for on / off controlling the powder feeder, and the pressure liquid supply pump based on a detection result of the powder level meter. Te, said mixed The apparatus includes a cylindrical guide having a lower opening, a powder supply pipe projectingly arranged on the upper side of the cylindrical guide, a powder receiving hopper integrated with an upper end of the powder supply pipe, and the cylinder A ring-shaped distribution head which is disposed around the powder supply pipe and has a pressure liquid connection pipe protruding integrally on the side thereof, and a lower part of the distribution head. And a plurality of pressure liquid jet nozzles, the tip of which is inserted into the upper part of the cylindrical guide and protrudes toward the lower opening of the cylindrical guide .
[0010]
According to the continuous mixing system of the present invention, the liquid level of the liquid mixture in the storage tank is automatically measured by a liquid level meter such as a liquid level sensor, and a preset maximum water level or minimum water level is detected. As a result, the power supply of the water supply pump and the powder feeder is automatically turned on and off. On the other hand, the remaining amount of the powder material in the powder feeder is automatically measured by a powder level meter such as a powder level sensor, and the powder material is replenished by operating the powder supply device as necessary. . That is, by these, automation of mixed solution preparation is achieved.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows the overall configuration of a continuous mixing system according to the present invention.
[0012]
The system in the figure includes a storage tank 2 disposed in a lower part surrounded by a frame 1, a mixing device 3 fixedly disposed above the storage tank 2, a powder feeder 4 disposed above the mixing device 3, and A coil feeder 6 serving as a powder supply device for supplying the powder A stored in a powder hopper 5 disposed in the vicinity of the frame 1 to the powder feeder 4, and a water supply pump 7 for supplying water to the mixing device 3. And a monopump 8 that discharges the liquid mixture stored in the storage tank 2 toward the supply side.
[0013]
In addition, a liquid level sensor 15 that automatically detects the water level of the mixed liquid stored in the storage tank 2 is provided in the storage tank 2, and the amount of powder in the powder feeder 4 is included in the powder feeder 4. A powder level sensor 16 for automatically detecting the detected value is provided, and the detection values of these sensors 15 and 16 are input to the control device 17.
[0014]
Furthermore, the control device 17 controls the drive of the water supply pump 7 and the powder feeder 4 so that water and the powder material are always mixed at a desired mixing ratio, and the detected value of the liquid level sensor 15. Accordingly, a function of turning on / off the water supply pump 7 and the powder feeder 4 and a function of turning on / off the coil feeder 6 according to the detection state of the powder level sensor 16 are provided.
[0015]
Here, as shown in an enlarged view in FIG. 2, the mixing device 3 includes a cylindrical guide 9 having a lower opening, a powder supply pipe 10 that protrudes from the upper side of the cylindrical guide 9, and a powder supply pipe. 10 is a powder receiving hopper 11 integrated at the upper end of 10 and an upper portion of a cylindrical guide 9, which is arranged around the powder supply pipe 10 and has a high-pressure water connection pipe 12 projecting integrally on its side. A plurality of ring-shaped distribution heads 13 and a plurality of protrusions integrally projecting from the lower part of the distribution head 13 and projecting toward the lower openings of the cylindrical guides 9 with their tips inserted into the upper parts of the cylindrical guides 9. It consists of a high-pressure water jet nozzle 14.
[0016]
Therefore, in this mixing device 3, the high pressure water W is sprayed from each nozzle 14 while continuously supplying the powder A from the powder feeder 4 into the powder receiving hopper 11. While expanding the ejection range, the powder A collides with the powder A falling in the center due to the ejection pressure, and forcibly mixes, and the negative pressure generated around the nozzle 14 is urged to fall by the ejection.
[0017]
Then, this mixture repeats a plurality of collision reflections on the inner wall of the cylindrical guide 9 depending on the direction of the water flow, as shown by a chain line in FIG. The liquid mixture is continuously discharged toward the storage tank 2.
[0018]
The length of the cylindrical guide 9 can be adjusted in consideration of the number of in-cylinder reflections of the water flow in accordance with the type of powder and mixing characteristics.
[0019]
Further, the supply amounts of the powder A and the high-pressure water W are quantitatively supplied according to the pre-designed blending amount.
[0020]
And according to the continuous mixing system of this embodiment, when the liquid level sensor 15 detects the minimum water level or the maximum water level of the liquid mixture in the storage tank 2 set in advance, the control device 17 is connected to the water supply pump 7 and the powder. The body feeder 4 is automatically turned on / off. Further, the powder level sensor 16 automatically measures the remaining amount of the powder A in the powder feeder 4, and when the preset minimum amount or maximum amount is detected, the coil feeder 6 is automatically turned on / off. . Further, the control device 17 drives and controls the feed water pump 7 and the powder feeder 4 so that the powder A and the high-pressure water W are mixed at a preset mixing ratio.
[0021]
Therefore, according to the continuous mixing system of this embodiment, the powder material and water can be mixed continuously and efficiently while automating as the construction progresses.
[0022]
In addition, with the unmanned and automatic operation of the equipment, labor can be saved, which can greatly contribute to the cost reduction at the site and contribute to the reduction of construction site by reducing the size and weight of the equipment. be able to.
[0023]
In addition, this invention is not limited to the thing of the aspect of the said embodiment, A various change can be employ | adopted within the range of the structure described in the claim. For example, if the mixing device is a device provided with a powder dropping part for dropping powder and a nozzle for causing pressure water to collide with the falling powder, for example, the mixing described in JP-A-6-57004 An apparatus can also be employed.
[0024]
Further, the liquid to be mixed with the powder is not necessarily water, and the continuous mixing system of the present invention is not limited to the civil engineering field, but also in the food field, the chemical field, and other various industrial fields. Can be adopted.
[0025]
【The invention's effect】
As is apparent from the above description, the continuous mixing system for powder materials according to the present invention eliminates the need for a conventional large-scale stirring device, and facilitates automation of mixing operations with a simple configuration mixing device. It is possible to produce a large amount of mixed solution easily and continuously. Furthermore, since these are mixed at a preset mixing ratio during the mixing of the powder and the pressure liquid, a stable mixed solution can be continuously produced. Moreover, the mixture of the powder and the high-pressure liquid repeats the collision reflection a plurality of times on the inner wall of the cylindrical guide and obtains a plurality of cross-stirring effects by the collision reflection, so that the mixing operation can be made more efficient. .
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing the overall configuration of a continuous mixing system according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a main part of a mixing device used in the system.
[Explanation of symbols]
2 Storage tank 3 Mixing device 4 Powder feeder 5 Powder hopper 6 Coil feeder (powder supply device)
7 Water supply pump 9 Cylindrical guide 10 Powder supply pipe 14 High-pressure water jet nozzle 15 Liquid level sensor 16 Powder level sensor 17 Control device (control means)
A Powder W High pressure water

Claims (2)

A powder dropping unit for dropping powder and a nozzle for causing pressure liquid to collide with the falling powder, and a mixing device that drops the mixed liquid while mixing the pressure liquid and the powder;
A storage tank equipped with a liquid level meter for storing the liquid mixture obtained by the mixing device;
A powder feeder with a powder level meter disposed above the mixing device to supply powder to the powder dropping part of the mixing device;
A powder supply device for supplying powder to the powder feeder;
A pressure liquid supply pump for supplying pressure fluid to the mixing device,
Based on the detection result by the liquid level meter and the powder level meter, the powder feeder, with on-off controlling said powder supplying device and the pressure fluid supply pump, while mixing with the pressure fluid and said powder Control means for driving and controlling the pressure liquid supply pump and the powder feeder so that they are mixed at a preset mixing ratio ;
A continuous mixing system of powder materials characterized by comprising: A powder dropping unit for dropping powder and a nozzle for causing pressure liquid to collide with the falling powder, and a mixing device that drops the mixed liquid while mixing the pressure liquid and the powder;
A storage tank equipped with a liquid level meter for storing the liquid mixture obtained by the mixing device;
A powder feeder with a powder level meter disposed above the mixing device to supply powder to the powder dropping part of the mixing device;
A powder supply device for supplying powder to the powder feeder;
A pressure liquid supply pump for supplying pressure fluid to the mixing device,
And a control means based on said detection result by the liquid level meter and the powder level meter, on-off control the powder feeder, the powder supplying device and the pressure fluid supply pump,
A continuous mixing system of powder material comprising:
The mixing device includes:
A cylindrical guide having a lower opening; a powder supply pipe projectingly arranged on the upper side of the cylindrical guide; a powder receiving hopper integrated with an upper end of the powder supply pipe; A ring-shaped distribution head which is disposed around the powder supply pipe and protrudes a pressure liquid connection pipe integrally on the side thereof, and is integrally protruded from the lower part of the distribution head. And a plurality of pressure liquid jet nozzles, the tip of which is inserted into the upper part of the cylindrical guide and protrudes toward the lower opening of the cylindrical guide, and a continuous mixing system of powder material.

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