JP2000254468A - Jet mixer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jet mixer which is capable of inhibiting deposited matter from being caused or preventing deposited matter from being grown, by a comparatively simple process. SOLUTION: In this jet mixer, a cylindrical tube 10 is inserted into a power tube 3 in such a way that the tube 10 is laid inside the tube 3 in the range from the rear end side 3a of the tube 3 to a position below a granule charging port 4a and cutting edges 10b are formed in the cylindrical tube 10. When a driving gear 16 is rotated by the drive of a first driving motor 14, the rotational force of the driving gear 16 is transmitted to a gear 12 to rotate the cylindrical tube 10. Also, a nozzle 2 is placed in such a way as to interpose a space L between the nozzle 2 and the adjacent one end of the cylindrical tube 10. Further, a vertical tube 17 communicated with the inside of the power tube 3 is placed right below the granule charging port 4a and a cylindrical tube 22 having an outer diameter slightly smaller than the inner diameter of the vertical tube 17 is inserted into the vertical tube 17 and also cutting edges are formed inside the cylindrical tube 22. When a driving gear 28 is rotated by the drive of a second driving motor 26, the rotational force of the driving gear 26 is transmitted to a gear 24 to rotate the cylindrical tube 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet mixer for continuously producing a paste by mixing and stirring powder and granules by a high-speed jet water stream.

[0002]

2. Description of the Related Art As a method for producing a paste by mixing and stirring water and a granular material such as cement, coal ash, blast furnace slab, lime, etc., besides a mechanical mixing method using rotating blades, it is also called a power tube. There is a jet mixer in which a high-speed jet water stream is passed through a pipe to be added, and powder and granules are added thereto to produce a paste.

As shown in FIGS. 4 to 6, the structure of this jet mixer is as follows.
Nozzle 2 for generating jet stream W, jet stream W
A powder tube, a hopper 4 having a powder material inlet 4a into the power tube 3, a storage hopper 5a for the powder S, and a powder and granule supply facility 5 having a screw feeder 5b, and a container for receiving the paste. It is composed of a cyclone 6 and the like.

Then, the jet water stream W coming from the rear end side of the power tube 3 sucks the granular material S by negative pressure (back pressure) in the same manner as spraying, and the granular material S is introduced at the inlet 4a of the granular material S. And the jet stream W collide violently.

[0005] The mechanism of stirring and mixing with a jet mixer is such that high-pressure jet water is injected into a tube,
Since the energy of the high-pressure water is released at once, it becomes a very fine spray and adheres to the surface of the granular particles, and the turbulent water flow generated in the power tube 3 entrains and agitates the granular material, and further increases the power. The paste ejected from the distal end of the tube 3 collides with the cyclone 6, adheres to the inner surface of the cyclone 6, applies a shearing force to the paste itself by the flow pushing force of the paste itself, and the kneading force (kneading) proceeds. .

[0006]

The jet mixer has a simple structure and has an advantage that it has a structure for continuously producing a paste. However, the greatest weak point is that the jet mixer is used in the power tube 3 or the powder or the like. This is a problem that deposits are generated near the mouth 4a. The deposit is a paste in which the granular material S and the water come into contact with each other and remains on the inner surface of the pipe. The generation causes are roughly classified into a negative pressure phenomenon generated by the jet water stream W and a deposition phenomenon of the granular material S due to gravity. it can. The main parts where the deposits are generated are near the nozzle 2 (reference A in FIG. 4),
a and the contact point of the power tube 3 (reference numeral B in FIG. 4), and below the granular material inlet 4a (reference numeral C in FIG. 4).

[0007] The cause of the generation of the deposits in the vicinity A of the nozzle 2 is caused by the negative pressure generated by the jet water stream W being generated in the vicinity of the nozzle 2 and causing the supplied granular material S to flow back toward the nozzle 2.

[0008] The cause of the generation of deposits at the contact point B between the powder / particle input port 4a and the power tube 3 is that water droplets are diffused near the powder / particle input port 4a and water droplets are formed at the contact point between the powder / particle input port 4a and the power tube 3. And the granular material S comes into contact with the granular material S, and the deposited material is generated. The deposited material gradually expands and narrows the granular material input port 4a, and a negative pressure is generated at the same location to suck up the jet water stream W. Is caused by growing.

[0009] The cause of the generation of deposits below the powder-particle input port 4a is caused by the fact that the charged powder does not survive the jet water stream W and precipitates and deposits downward by the action of gravity.

[0010] The present invention has been made in view of the above circumstances, and it is possible to prevent attachments from growing or to prevent the growth of the attachments by a relatively simple method, thereby improving the efficiency of paste production. It is an object of the present invention to provide a jet mixer capable of continuously and stably producing a paste having a desired quality.

[0011]

In order to solve the above-mentioned problems, a jet mixer according to the present invention passes a jet water jet ejected from a nozzle from a rear end to a front end of a power tube, and the jet water jet is supplied to the jet mixer. By pulling in the granular material charged into the power tube from the granular material charging section by the negative pressure generated by the above, the granular material is collided with the inner surface of the cyclone connected to the tip end side, whereby the granular material is Pressure to reduce the negative pressure generated in the power tube near the nozzle and in the vicinity of the input portion of the powder and granules in a jet mixer that obtains a paste having a desired water / powder ratio by stirring and mixing water and water. Equipped with reduction means.

[0012] According to the present invention, the powder and granular material injected into the power tube does not flow backward in the nozzle direction and is less likely to adhere to the nozzle. It is possible to prevent the growth of deposits.

In this case, the negative pressure reducing means can be obtained by a simple structure in which the inside of the power tube near the nozzle is communicated with the outside air, and the inside of the powder material charging section is communicated with the outside air.

[0014] Further, it is possible to equip the inside of the power tube near the nozzle and the inside of the granular material charging section with a granular material removing device for removing the granular material adhered to the inner surface thereof. According to this, since the granules do not adhere to the inside of the power tube and the inside of the granule charging section, it is possible to increase the efficiency of the paste production and continuously and stably produce the paste of the desired quality. Becomes

In this case, a cutting blade that is in contact with the inner surface of the power tube or the inner surface of the powder material input section, and a moving mechanism that moves the cutting blade along the inner surface. And a simple configuration including:

Here, a cylindrical tube having an outer diameter slightly smaller than these inner diameters is inserted into the power tube and the granular material charging section, a through hole is formed in the cylindrical tube, and the cylindrical tube extends in the axial direction of the through hole. By using the existing edge as a cutting blade and rotating the cylindrical tube around an axis by a rotating mechanism, powder particles adhered to the inner surface of the power tube and the powder material input section can be shaved off by the cutting blade. . It is to be noted that, not limited to the cylindrical tube provided with the through-hole described above, for example, a virtuously shaped member may be inserted into the inside of the power tube and the inside of the granular material charging section, and the virtuously shaped member may be rotated by a rotating mechanism. In addition, the adhered powder can be scraped off.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings. 4 to 6
The same reference numerals are given to the same components as those shown in FIG.

FIG. 1 shows the structure of a power tube 3 in the vicinity of a nozzle 2 and in the vicinity of a powder material inlet 4a of a jet mixer according to this embodiment.

Power tube 3 facing nozzle 2
A cylindrical tube 10 having an outer diameter slightly smaller than the inner diameter of the power tube 3 is inserted into the inside of the tube from the rear end side 3a to a position below the granular material inlet 4a. This cylindrical tube 1
2, a plurality of through holes 10a are formed at predetermined intervals in the circumferential direction as shown in FIG.
An edge extending in the axial direction of 0a has a cutting blade 10b for shaving powder S adhered to the inner surface of the power tube 3 described later.
It has been.

A ring-shaped gear 12 is fixed to the opening on the rear end 3a of the cylindrical tube 10.
A drive gear 16 connected to a drive shaft 14a of the first drive motor 14 meshes. When the drive gear 16 is rotated by the drive of the first drive motor 14, the rotational force is transmitted to the gear 12, and the cylindrical tube 10 rotates in the power tube 3.

Incidentally, the cylindrical tube 10, the gear 12, the first drive motor 14 and the drive gear 16 correspond to the powder and granular material removing apparatus of the present invention, and the gear 12, the first drive motor 14 and the drive gear 1
Reference numeral 6 corresponds to the moving mechanism of the present invention. In addition, cylindrical tube 1
A gap L of about 10 mm is provided between the nozzle 2
Are arranged.

On the other hand, a vertical pipe 17 communicating with the inside of the power tube 3 is provided below the powder material inlet 4a. A cylindrical pipe 22 having an outer diameter slightly smaller than the inner diameter of the vertical pipe 17 is inserted into the vertical pipe 17. As shown in FIG. 3, a plurality of through holes 22a are formed in the cylindrical tube 22 at predetermined intervals in the circumferential direction, and the edges of the through holes 22a extending in the axial direction are formed by connecting openings. Cutting blade 22 for shaving powder S attached to section 20
b.

A ring-shaped gear 24 is fixed to the upper opening of the cylindrical tube 22.
A drive gear 28 connected to a drive shaft 26a of the second drive motor 26 meshes. When the drive gear 28 rotates by the driving of the second drive motor 26, its rotational force is transmitted to the gear 24, and the cylindrical tube 22 rotates in the vertical tube 17. The cylindrical tube 22, the gear 24, the second
The drive motor 26 and the drive gear 28 correspond to the powder and granular material removing device of the present invention, and the gear 24, the third drive motor 26, and the drive gear 28 correspond to the moving mechanism of the present invention.

According to the jet mixer having the above structure, even if the jet water stream W is jetted from the nozzle 2, the jet water flows into the power tube 3 near the nozzle 2 from the gap L provided between the nozzle 2 and the end of the cylindrical tube 10. Since the outside air flows and almost no negative pressure is generated in the vicinity of the nozzle 2, the granular material S introduced into the power tube 3 does not flow backward in the direction of the nozzle 2, and flows toward the rear end 3 a of the power tube 3 near the nozzle 2. The powder S becomes difficult to adhere.

Even if the granular material S adheres to the inner surface of the rear end side 3a of the power tube 3, the first driving motor 14 drives the cylindrical tube 10 via the driving gears 16 and 12 to drive the cylindrical tube 10 to the power tube 3. By rotating the inside, the granular material S to which the cutting blade 10b of the cylindrical tube 10 adheres can be easily scraped off.

Further, even if the powder S which has not been able to ride on the jet water stream W precipitates and accumulates on the inner surface of the power tube 3 below the powder input 4a, even if the deposit is generated, the rotating cylindrical tube 10 is The adhering matter can be shaved by the cutting blade 10b, sent to the upper part of the power tube 3 with the rotation of the cylindrical tube 10, and sucked into the jet water stream W again.

On the other hand, the ventilation holes 1 formed in the vertical pipe 17
Since the outside air flows from 8 into the lower end of the vertical pipe 17 and the connection opening 20 of the power tube 3, a negative pressure hardly occurs near the connection part opening 20 and the jet water W is not sucked up. It is possible to prevent the attached matter of the granular material S from growing.

Even if the granular material S adheres to the connection opening 20, the driving gear 28,
By rotating the cylindrical pipe 22 in the vertical pipe 17 via the gear 24, the powder and granular material S to which the cutting blade 22b of the cylindrical pipe 22 adheres can be easily scraped off.

Therefore, the jet mixer according to the present embodiment can prevent the attached matter of the granular material S from adhering to the inner surface of the power tube 3 and the connection opening 20 or prevent the attached matter from growing. It is possible to continuously and stably produce a paste of the desired quality with improved paste production efficiency.

[0030]

As described above, according to the jet mixer according to the first or second aspect, the powder and granular material charged into the power tube does not flow backward in the nozzle direction and is less likely to adhere to the nozzle. Since the jet water flow is not sucked up to the part side, it is possible to prevent the growth of the attached matter of the granular material.

According to the jet mixer of the third or fourth aspect, since the powder does not adhere to the inside of the power tube and the inside of the powder input section, the paste production efficiency is improved and the paste of the desired quality is obtained. Can be continuously and stably manufactured.

[Brief description of the drawings]

FIG. 1 shows the structure of a power tube in the vicinity of a nozzle and in the vicinity of a granular material inlet of a jet mixer according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is an overall configuration diagram of a conventional jet mixer.

FIG. 5 is a plan view of a conventional jet mixer.

FIG. 6 is a sectional view taken along line VI-VI of FIG. 4;

[Explanation of symbols]

 2 Nozzle 3 Power tube 3a Rear end of power tube 4 Hopper 4a Powder material inlet 6 Cyclone 10,22 Cylindrical tube 10a, 22a Through hole 10b, 22b Cutting blade 12,24 Gear 14 First drive motor 16,28 Driving gear 17 Vertical pipe (powder for granular material) 18 Inlet hole 26 Second drive motor S Granular material W Jet water flow

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kenro Kobayashi 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. (72) Inventor Akira Uchida 2- 10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. (72) Inventor Akihide Koseki 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. (72) Shin-ichi Igawa 2-10-26 Fujimi, Chiyoda-ku, Tokyo Maeda Construction Industry Co., Ltd. F-term (reference) 4G035 AB44 AC23 AC51 AD04

Claims (4)

[Claims] 1. A jet water jet ejected from a nozzle is passed from a rear end to a front end in a power tube, and is injected into the power tube from a powder material input portion by a negative pressure generated by the jet water flow. Pull in the granules,
In a jet mixer for obtaining a paste having a desired water / granule ratio by stirring and mixing the granules and water by colliding the drawn-in granules with the inner surface of the cyclone connected to the tip end side, A jet mixer comprising negative pressure reducing means for reducing a negative pressure generated in a power tube near the nozzle and in the vicinity of a granular material charging section. 2. The apparatus according to claim 1, wherein said negative pressure reducing means has a structure in which an inside of a power tube near said nozzle is communicated with outside air, and an inside of said powder material charging section is communicated with outside air. The described jet mixer. 3. The apparatus according to claim 2, further comprising a powder removing unit that removes powder attached to the inner surface of the power tube near the nozzle and inside the powder input unit. The jet mixer according to claim 1. 4. The granular material removing device includes a cutting blade that is in contact with an inner surface of the power tube or the inner surface of the charging section, and a moving mechanism that moves the cutting blade along the inner surface. The jet mixer according to claim 3, wherein: