JP2024061989A - Mixing Equipment - Google Patents

Abstract

[Problem] To improve the degree of mixing of materials to be processed and additives by an agitator. [Solution] The agitator of this invention is an agitator in which a rotor 3, which has a number of agitator claws 13 arranged in a spiral shape and protruding from the outer periphery of a rotating shaft 7, is supported inside a cylindrical drum case 2, and while rotating the rotor 3, the materials to be processed are agitated and discharged from the other end of the drum case 2. A nozzle 19 is provided on the peripheral wall of the drum case 2 for spraying additives in the direction of rotation of the rotation trajectory L of the rotor 3. The drum case 2 is formed into a U-shaped cross section as a whole, and a lid 14 is attached to close the open end. A nozzle 19 is provided facing downwards for spraying additives along the raking direction through the agitation space 17 formed in the inner corner between the lid 14 and the side walls 2a, 2b. [Selected Figure] Figure 4

Description

Application for application of Article 30, Paragraph 2 of the Patent Act has been filed. Exhibition name: INCHEM TOKYO 2021, the 34th Plant Show Venue: Tokyo Big Sight Date: November 17, 2021 - November 19, 2021

This invention relates to a mixing device that mixes powders and granular materials, and crushes and mixes lumps of earth and minerals.

Conventionally, as described in Patent Documents 1 and 2, an agitation device like the one described above is known in which a rotor with multiple agitation claws arranged in a spiral on the outer periphery of a rotating shaft is supported inside a cylindrical drum case, and the material to be treated is fed into one end of the drum case and agitated, crushed, and mixed while being sent out to the other end.

The various types of materials to be mixed as described above are often subjected to preliminary treatment, depending on the type of material and the purpose of the treatment, for example to mix or grind efficiently in a short time, or to modify the mechanical, physical, or chemical properties of the material for the next processing or treatment step.

For this reason, when powders, granules, gases, liquids, or mixtures of these are added prior to processing with these mixing devices, they are added before the mixing process, or are supplied by pouring, injection, scattering, spraying, etc. into the drum case during mixing.

Patent No. 6889924 Patent No. 6156803

However, even when the above method is used inside the drum case, there are problems such as insufficient or uneven mixing, and in order to improve these problems, it is necessary to ensure that the treated material has a sufficient residence time inside the drum case.

The agitation device of the present invention, which aims to solve the above problems, is a device that first supports a rotor 3, which has a number of agitation claws 13 arranged in a spiral shape and protruding from the outer periphery of a rotating shaft 7, inside a cylindrical drum case 2, and agitates the material fed into one end of the drum case 2 while rotating the rotor 3, and discharges it out the other end, and is characterized by having a nozzle 19 installed on the peripheral wall of the drum case 2 for spraying additives in the direction of rotation of the rotation trajectory L of the rotor 3.

Secondly, the cross section of the lower half of the drum case 2 is formed in an arc shape following the rotation trajectory L of the rotor 3, and the entire cross section is formed in a U-shape with the upper end open. A lid 14 is attached to close the open end, and agitation spaces 17 are formed in the inner corners between the lid 14 and the front and rear side walls 2a and 2b of the drum case 2, in which the processed material is splashed up. A nozzle 19 is installed on the lid 14 facing downward, which sprays additives through the agitation space 17 on the suction side of the rotor 3 along the suction direction of the agitation claws 13.

Thirdly, it is characterized in that multiple nozzles 19 are arranged side by side at a predetermined interval along the axial direction of the rotor 3.

Fourthly, the nozzle 19 is characterized by using a nozzle 19 that ejects material in a fan-shaped spray along the axial direction of the rotor 3 inside the drum case 2.

The device of the present invention configured as described above sprays additives in the direction of rotation of the rotor (the direction of inlet), so the additives (gas or liquid) or powder or granular material sprayed together with them are smoothly fed into the interior by the rotation of the rotor's stirring claws, and efficiently and uniformly mix or come into contact with the material to be treated. This has the advantage that mixing, crushing, physical and chemical processing, etc. according to the processing purpose of the material to be treated can be performed reliably.

The nozzle sprays the additive through the mixing space inside the drum case, supplying it to the material being treated as it is dispersed within the space, promoting mixing and contact with the material being treated.

In addition, by arranging multiple nozzles in a row along the axial direction of the drum case, the additives are sprayed evenly over a long area around the rotor, ensuring that the additives are supplied evenly and reliably to the material being treated, improving treatment performance. In addition, the additives are spread in a fan shape along the axial direction, further improving the additives' uniform mixing and treatment performance.

1 is an overall front view of a stirring device of the present invention. FIG. FIG. 2 is an overall plan view of the stirring device. 1A and 1B are front and right side sectional views of the rotor and drum case, respectively.

Figures 1 to 4 show one embodiment of the device of the present invention, in which a cylindrical drum case 2 is installed in the longitudinal (left-right) direction on a mounting frame 1 that serves as a base, and a rotor 3 is housed inside the drum case 2 along the longitudinal direction, with the left and right ends rotatably supported by bearings 4 and 6. In this example, the rotor 3 rotates counterclockwise when viewed from the right side.

A motor 9 is attached to the left end of the mounting frame 1 and is connected to the rotating shaft 7 of the rotor 3 via a clutch (or coupling) 8, and the motor 9 drives and rotates the rotor 3. An inlet 11 with a hopper for the processed material is provided on the left end (motor side end) of the drum case 2, and an outlet 12 for discharging the stirred and mixed processed material is provided on the lower right end. Both the left and right ends of the drum case 2 are closed by end plates 10.

A number of stirring claws 13 are spirally arranged and radially protruded at regular intervals from the outside circumference of the rotating shaft 7 of the rotor 3. As shown in FIG. 4(A), the stirring claws 13 consist of a feed claw 13a and a return claw 13b at the upper end of the discharge port 12. In this example, the feed claws 13a are generally hatchet claws that are twisted toward the tip and curved in a mountain shape along the direction of rotation, similar to the rotary (cultivation) claws attached to the rotary of a tractor or cultivator. As the rotor 3 rotates forward, the material to be treated is stirred, mixed, crushed, etc., while being scraped in, and then transported in the discharge direction.

The return claw 13b is similar to the feed claw 13a in that it is curved in a mountain shape, but the twisting direction toward the tip is the opposite, and the forward rotation of the rotor 3 provides a reverse return action against the discharge (transport) operation of the processed material, preventing the material from accumulating on the discharge port 12 and ensuring discharge. 15 is a receiving tray located below the discharge port 12.

The drum case 2 has a total length of, for example, about 3.8 m, and is formed with a U-shaped cross section as shown in Figure 4 (B). Its inner bottom surface is a semicircular arc surface that is concentric with the rotation path L of the agitating claws 13 of the rotor 3, and both front and rear side walls 2a are open vertically upward. The open ends are covered with flat lids 14 that are removably attached and fixed by clampers 16. The top and left and right ends of the drum case 2 are closed, and the drum case 2 is formed into a cylindrical shape with a U-shaped cross section as a whole.

A resilient rubber liner (not shown) of a certain thickness is attached to the inner surface of the drum case 2 by adhesive or screw fastening, and there is a clearance of 5 to 6 mm between the outer diameter (rotation path L) of the rotor 3, which is about 320 mm, and the inner diameter of the liner. This mechanism prevents the material from sticking to the inner surface of the drum case 2 when the material is stirred while rotating at, for example, 90 to 300 rpm, and maintains high mixing performance.

A mixing space 17 consisting of an irregular space is formed on the rotation trajectory L of the rotor 3 inside the drum case 2 at a corner surrounded by the rotation trajectory L, the inner surface of the lid 14, and the upper end of the side wall 2a.

The open end (opening) of the drum case 2 is formed between the input port 11 and the end of the transport path (right end), and the lid 14 that covers it is equipped with a hook bolt 18 for lifting, as well as multiple nozzles 19 arranged in a row in the left-right direction at a predetermined interval along the axial direction of the rotor 3 at the front end side, which is the side where the material inside is taken in. The front-to-rear positions are determined according to the rotation direction (take-in direction) of the rotor 3.

The nozzle 19 is used to spray additives determined according to the material and its processing purpose onto the material being stirred, and is installed facing downward so that the spray direction is aligned with the direction of rotation of the rotation trajectory of the rotor 3 (the direction of the stirring claws 13).

Each nozzle 19 has the function of spraying the ejected material inside the drum case 2 while spreading it in a fan-like shape from left to right along the axial direction (see FIG. 4(A)). As a result, inside the drum case 2, the additive is sprayed uniformly in a continuous linear state or nearly so on the left and right sides along the nozzle arrangement direction on the rake side of the rotor 3, and the gaseous additive enhances mixing performance.

The additives used depend on the material to be treated and the purpose of the treatment. For example, when crushing and mixing soil lumps, moisture in the form of steam is supplied to facilitate crushing, and gas is supplied to improve mixability. If aggregates are to be formed in the next process, additives containing a binder that promotes aggregate formation are supplied, or additives that impart viscosity to powders, etc. Other additives that have mechanical, physical, or chemical modifying functions, such as pH adjusters, disinfectants, and temperature adjusters, are also envisioned, and may be in the form of gas, liquid, powder, granules, or a mixture of these.

In addition, the materials being mixed are stirred up into the mixing space 17 by the rotor 3 while dispersed in the air, further improving the mixing function. In addition, spraying additives into this space also has the advantage of increasing the degree of mixing of the additives themselves.

2 drum case 3 rotor 7 rotating shaft 13 stirring claw 14 lid 17 stirring space 19 nozzle L rotation trajectory

Claims (4)

A rotor (3) with many stirring claws (13) arranged in a spiral on the outer periphery of a rotating shaft (7) is supported inside a cylindrical drum case (2), and while rotating the rotor (3), the material to be treated is fed into one end of the drum case (2) and discharged out the other end. A nozzle (19) is installed on the peripheral wall of the drum case (2) to spray additives in the direction of rotation of the rotation trajectory (L) of the rotor (3). The mixing device according to claim 1, in which the cross section of the lower half of the drum case (2) is formed in an arc shape following the rotation trajectory (L) of the rotor (3), and the upper part is formed as an open end and the whole is formed in a U-shaped cross section, a lid (14) is attached to close the open end, a mixing space (17) is formed in the inner corner part between the lid (14) and the front and rear side walls (2a) and (2b) of the drum case (2) where the processed material is splashed up, and a nozzle (19) is installed downward on the lid (14) to spray additives along the raking direction of the mixing claws (13) through the mixing space (17) on the raking side of the rotor (3). The stirring device according to claim 1 or 2, in which a plurality of nozzles (19) are arranged in parallel at predetermined intervals along the axial direction of the rotor (3). The stirring device according to claim 1 or 2, which uses a nozzle (19) that ejects a jet of material that spreads in a fan shape along the axial direction of the rotor (3) inside the drum case (2).

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