JP2022188507A - Mixing agitator - Google Patents

Abstract

To provide a mixing agitator which can easily undergo replacement work when a scraping member of an agitation blade is abraded.SOLUTION: A mixing agitator is adopted, which comprises an agitation blade body 10 formed, as an agitation blade 5, into a plate-like shape with each top including each apex of an equilateral triangle inclined in the same rotation direction when viewed from a thickness direction, and outwardly fitted to a rotating shaft through a bearing metal fitting 17 with an attitude orthogonal to the axial direction of the rotating shaft, and scraping members 11 attached detachably to the thickness surface 15 of a longer side of each inclined top 14 of the agitation blade body 10 with two blots 16. In this manner, when a scraping member 11 of the agitation blade 5 is abraded, only the abraded scraping member 11 is removed from the agitation blade body 10 to be replaced, and replacement work can be performed more efficiently than before because there is no need of replacing the entire agitation blades 5.SELECTED DRAWING: Figure 5

Description

The present invention relates to a kneading stirrer for kneading and stirring powders, liquids, high-viscosity fluids, and the like.

A kneading and stirring device generally comprises a cylindrical casing, at least one rotating shaft provided inside the casing so as to extend in the direction of the cylindrical axis, and a plurality of stirring blades attached to the rotating shaft in the axial direction. (paddle), and by rotationally driving the rotary shaft, the material to be processed supplied to the casing is kneaded and stirred with the stirring blades.

In such a kneading and stirring device, at least some of the plurality of stirring blades attached to the rotating shaft are formed in a plate shape having a plurality of vertexes when viewed from the thickness direction, and are arranged in the axial direction of the rotating shaft. and a raking member (stirring projection) protruding in the axial direction of the rotating shaft from the top including the top of the stirring blade body, and the stirring There is one in which the stirring of the material to be processed is promoted by a raking member of blades (see, for example, Patent Documents 1 and 2).

Japanese Patent No. 6771908 Japanese Patent Publication No. 2019-525832

However, in the kneading stirrer using the stirring blade having the scraping member as described above, if the scraping member of the stirring blade is formed integrally with the stirring blade main body, the treatment performance is deteriorated due to the abrasion of the scraping member. When degraded, it is necessary to replace the entire stirrer blade with worn scraping members. When replacing the entire stirring blade, remove the rotating shaft from the casing, attach and detach the stirring blade (including those that do not need to be replaced) from the rotating shaft, and then attach the rotating shaft to the casing. There was a problem that this replacement work would take a lot of time and effort.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a kneading stirrer in which a scraping member of a stirring blade can be easily replaced when it is worn.

In order to solve the above problems, the present invention provides a tubular casing, at least one rotary shaft provided inside the casing so as to extend in the axial direction of the tubular casing, and a rotary shaft arranged in the axial direction of the rotary shaft. In the kneading and stirring device provided with a plurality of stirring blades attached to the rotating A configuration comprising: a stirring blade main body externally fitted on the rotating shaft in a posture perpendicular to the axial direction of the shaft; It was adopted.

According to the above configuration, when the raking member of the stirring blade is worn, only the worn raking member can be removed from the stirring blade main body and replaced, so that the stirring blade does not need to be replaced or removed from the casing of the conventional rotating shaft. It is possible to eliminate the attachment and detachment work for the rotating shaft of the , and the replacement work can be performed efficiently.

Here, the raking member is attached to the stirring blade body by two or more bolts that are screwed from the surface thereof into the top portion of the stirring blade body, and the surface side of the stirring blade body is counterbored to accommodate the heads of the bolts. A configuration in which a portion is formed can be adopted. If two or more bolts are used in this way, the scraping member does not rotate along the thickness surface of the impeller body, and the bolts are less likely to loosen. There is no risk of damaging the inner wall of the casing by protruding from the recessed portion.

Further, when the head of the bolt is accommodated in the counterbore of the scraping member as described above, the counterbore of the scraping member is buried by welding while accommodating the head of the bolt. Alternatively, it is desirable that the front side opening is closed with a cap that is fitted into the inner periphery of the counterbore while the head of the bolt is accommodated. By doing so, it is possible to reliably prevent damage due to contact between the inner wall of the casing and the bolt head.

As described above, in the kneading and stirring apparatus of the present invention, as at least a part of the stirring blades, the stirring blade body is detachably attached with the scraping member. Therefore, when the scraping member is worn, , only the scraping member that has worn out can be replaced, and as a result, the labor for the replacement work can be greatly reduced as compared with the conventional one.

1 is a longitudinal front view of a kneading and stirring device according to an embodiment of the present invention; FIG. Cross-sectional plan view of the kneading and stirring device of FIG. Cross-sectional view along the III-III line in Fig. 2 A perspective view of a stirring blade of the kneading stirrer of FIG. Front view of FIG. Vertical cross-sectional front view showing an enlarged main part of FIG. Vertical cross-sectional front view showing a main part of a modified example of the stirring blade corresponding to FIG.

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, this kneading and stirring apparatus has a pair of rotating shafts 3 arranged parallel to each other so as to extend in the direction of the cylindrical axis of the casing 1 in the processing chamber 2 inside the cylindrical casing 1. Each rotary shaft 3 is provided with screw blades 4a and 4b at both ends in the processing chamber 2, and a large number of stirring blades 5 between the screw blades 4a and 4b.

The casing 1 has a cross-sectional shape in which two circles of the same diameter intersect. A jacket 8 for heating and cooling is provided on the outer peripheral surface except for the outlet 7 .

Both ends of the rotating shafts 3 protrude from the casing 1, and are rotated in the same direction at the same rotational speed by a motor (not shown) connected to one protruding end. there is

Each of the screw blades 4a and 4b has a mounting hole (not shown) at the center of which the rotary shaft 3 is inserted and is keyed in a position orthogonal to the rotary shaft 3. The blade 4a is a feed blade, and the screw blade 4b on the discharge port 7 side is a return blade. As a result, when the rotating shaft 3 is driven to rotate, the material to be treated supplied from the supply port 6 of the casing 1 is fed into the row of the stirring blades 5 by the screw blades 4a on the supply port 6 side, and the discharge port 7 It is sent back to the row of stirring blades 5 by the side screw blades 4b, gradually moves to the other end side of the casing 1 while being kneaded and stirred by the stirring blades 5, and is discharged from the discharge port 7.

The stirring blades 5 are attached to one rotating shaft 3 and attached to the other rotating shaft 3 so that the mounting positions of the stirring blades 5 are staggered in a cross section including the axial centers of both rotating shafts 3. , and have the same phase along the axial direction of each rotating shaft 3 .

As shown in FIGS. 3 to 5, each of these stirring blades 5 includes a substantially triangular plate-shaped stirring blade main body 10 fitted on the rotating shaft 3, and three The scraping member 11 is provided.

The stirring blade main body 10 has an octagonal metal fitting mounting hole 12 formed in the center thereof, and the bearing metal fitting 13 and the rotating shaft 3 are fitted in the metal fitting mounting hole 12 in a posture orthogonal to the axial direction of the rotating shaft 3. is fixed to the rotating shaft 3 by a spline connection.

In addition, when viewed from the thickness direction, the stirring blade body 10 is formed in a shape in which the apexes including the respective vertices of an equilateral triangle are inclined in the same rotational direction. A raking member 11 is attached to each of 15 .

Each of the raking members 11 is a plate-like member having a substantially trapezoidal cross section when viewed from the thickness direction of the impeller main body 10. One leg of the trapezoidal shape extends along one side of the triangle of the impeller main body 10. and is attached to the impeller main body 10 by two bolts 16 screwed into the top portion 14 of the impeller main body 10 from the surface of the impeller main body 10 in a state of protruding forward and backward in the thickness direction of the impeller main body 10 .

As shown in FIGS. 5 and 6, the scraping member 11 is formed with a counterbore 18 for accommodating the head of the bolt 16 on the surface side of the bolt hole 17 through which the threaded portion of the bolt 16 is passed. The counterbore portion 18 is embedded by welding while accommodating the head portion of the bolt 16 . In addition, the weld metal 19 filling the counterbore 18 is surface-finished in order to reduce the rotational resistance of the scraping member 11 . Since the welded metal 19 can be easily removed by various methods, the raking member 11 can be easily removed from the stirring blade main body 10 .

As described above, this kneading and stirring device has a stirring blade main body 10 in which all the stirring blades 5 are fitted around the rotating shaft 3, and the raking member 11 is detachably attached to the blade main body 10. When the scraping member 11 is worn out, only the scraping member 11 that has worn out can be removed from the stirring blade main body 10 and replaced. Therefore, it is not necessary to remove the rotating shaft from the casing and then attach and detach the stirring blades to the rotating shaft as in the conventional art, and the labor for the replacement work can be greatly reduced compared to the conventional art.

In addition, since two bolts 16 are used to attach the rake-up member 11 to the stirring blade main body 10, the rake-up member 11 does not rotate along the thickness surface 15 of the agitation blade main body 10, and the bolts 16 do not rotate. In addition to being difficult to loosen, the counterbore portion 18 of the rake-up member 11 that accommodates the head of the bolt 16 is buried by welding, so that the head of the bolt 16 protrudes from the counterbore portion 18 during use and does not interfere with the inner wall of the casing 1. There is no risk of injury.

Here, instead of filling the counterbore portion 18 of the scraping member 11 of the stirring blade 5 by welding as described above, as in the modification shown in FIG. A cap 20 fitted to the inner periphery of the portion 18 may close the front side opening. In this modification, too, the scraping member 11 can be easily replaced, and damage due to contact with the head of the bolt 16 on the inner wall of the casing 1 can be reliably eliminated.

It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above-described meaning, and is intended to include all modifications within the scope and meaning of equivalents to the scope of the claims.

For example, the configuration of the stirring blades in which the raking member is detachably attached to the stirring blade body is desirably applied to all the stirring blades attached to the rotating shaft as in the embodiment, but the scraping member is worn. You may make it apply only to some stirring blades arrange|positioned at the easy position.

Moreover, the present invention is not limited to the twin-screw type kneading and stirring device in which a pair of rotating shafts are provided in the casing as in the embodiment, but can be applied to a kneading and stirring device having at least one rotating shaft.

1 Casing 3 Rotating shafts 4a, 4b Screw blade 5 Stirring blade 6 Supply port 7 Discharge port 10 Stirring blade main body 11 Raking member 14 Top 15 Thickness surface 16 Bolt 18 Counterbore 19 Welding metal 20 Cap

Claims (4)

A cylindrical casing (1), at least one rotating shaft (3) provided inside the casing (1) so as to extend in the direction of the cylinder axis, and the rotating shaft (3) in the axial direction in order. In a kneading stirrer equipped with a plurality of stirring blades (5) attached to
At least some of the stirring blades (5) among the plurality of stirring blades (5) are formed in a plate shape having a plurality of vertexes when viewed from the thickness direction, and are orthogonal to the axial direction of the rotating shaft (3). A stirring blade main body (10) externally fitted on a rotating shaft (3) in a posture, and a scraping member detachably attached to a thickness surface (15) of a top portion (14) including the vertex of the stirring blade main body (10). (11) A kneading stirrer characterized by comprising: The raking member (11) is attached to the stirring blade body (10) with two or more bolts (16) screwed from the surface thereof into the top portion (14) of the stirring blade body (10). 2. The kneading and stirring device according to claim 1, wherein a counterbore portion (18) for accommodating the head portion of the bolt (16) is formed on the side. 3. The kneading and stirring apparatus according to claim 2, wherein the counterbore portion (18) of the scraping member (11) is embedded by welding while accommodating the head portion of the bolt (16). The counterbore portion (18) of the raking member (11) is opened on the surface side by a cap (20) fitted to the inner periphery of the counterbore portion (18) while accommodating the head of the bolt (16). 3. The kneading and stirring device according to claim 2, wherein the is closed.

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