JP6771908B2 - Stirring blade structure for kneading stirrer - Google Patents

Description

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

The kneading and stirring device includes, for example, two rotating shafts arranged in parallel, a stirring blade (paddle) attached in the axial direction of each rotating shaft, and a casing for accommodating the rotating shaft and the stirring blade. The structure to have is common.
In this kneading and stirring device, there is a device in which a part of the outer periphery of the stirring blade is close to the inner peripheral surface of the casing and the inner peripheral surface of the casing is self-cleaned as the rotating shaft rotates (Patent Document 1, FIGS. 1 to 1 to 1). See FIG. 11 and the like).

In this self-cleaning type kneading and stirring device, a polycondensation resin having a low degree of polymerization is supplied as an object to be treated, and the resin is agitated to increase the degree of polymerization, and the object to be processed is continuously supplied and discharged. There is a continuous type in which a certain amount of object to be processed is supplied into a kneading and stirring device to knead and stir. The former is compact and can obtain high productivity, but has a problem that it is difficult to obtain a sufficient residence time and a required degree of polymerization cannot be obtained. The latter can obtain a sufficient degree of polymerization, but the productivity is inferior to that of the former, and the processing amount is determined by the amount of one supply. Therefore, in order to increase the productivity, the size is increased (capacity is increased). )There is a need to. The increase in size requires a large installation space, and the equipment is also expensive.

Japanese Unexamined Patent Publication No. 03-151033

From the above, many continuous self-cleaning type kneading and stirring devices are manufactured, but this kneading and stirring device is usually described with reference to FIG. 1 according to the present application, and has a cross section in which two circles having the same diameter intersect. In the processing chamber 2 inside the tubular casing 1 having a shape, screw blades 3a and 3b are provided at both ends, and a large number of stirring blades (paddles) 10 are provided along the axial direction between the screw blades 3a and 3b. The two rotating shafts 5 are arranged in parallel with each other. Further, the casing 1 is provided with a supply port 6 at the upper part on one end side and a discharge port 7 at the lower part on the other end side, and a jacket 8 for heating / cooling is provided on the outer peripheral surface excluding the supply port 6 and the discharge port 7. It is provided.

Both ends of both rotating shafts 5 project from the casing 1, and when both rotating shafts 5 and 5 are rotated by a motor, the polycondensation resin supplied from the supply port 6 of the casing 1 to the processing chamber 2 The (object to be processed) c is sent to the stirring blade 10 by the screw blade 3a, is sent back to the stirring blade 10 by the screw blade 3b, and is gradually kneaded and stirred by the stirring blade 10 toward the other end side of the casing 1. The resin c'has a high degree of polymerization and is discharged from the discharge port 7.

In such a kneading and stirring device, it is a problem whether the object to be processed c is retained and stirred in the casing 1 for an appropriate time. At this time, if the material is retained unnecessarily, the productivity may decrease and the degree of polymerization may be problematic, and it is difficult to properly feed the object to be treated c only with the feeding screw blade 3a.
For this reason, various techniques have been conventionally considered. For example, the stirring blade 10 is spirally inclined and attached to the rotating shaft 5, or the outer peripheral end side surface of the stirring blade 10 is inclined (patented). Reference 1 4 to 9).
However, the structure in which the stirring blade 10 is inclined in a spiral shape has a problem that it is difficult to adjust the residence time because it only feeds the stirring blade 10. Further, in the structure in which the outer peripheral end inclined surface of the stirring blade 10 is inclined, the outer peripheral end inclined surface is narrow and in the thickness direction of the stirring blade 10, so that a sufficient width cannot be secured and an appropriate feed rate and feed amount cannot be set. There's a problem.

An object of the present invention is to make it possible to set the appropriate feed rate and feed amount by devising the shape of the stirring blade under the above conditions.

In order to achieve the above object, the present invention has decided to form a slope inclined in the object feeding direction by cutting out the stirring blade.
If the notch portion is appropriately selected, an appropriate feed amount can be secured and appropriate stirring can be performed.

One configuration of the present invention is a stirring blade structure in which a rotating shaft in the tubular axial direction is provided in a tubular casing, and plate-shaped stirring blades are sequentially attached to the rotating shaft in the axial direction in the direction orthogonal to the rotating shaft. Therefore, it is possible to adopt a configuration in which an inclined surface inclined in the processing object feeding direction is formed on the axial surface of the stirring blade by a notch.

As another configuration of the present invention, a stirring blade in which a rotating shaft in the tubular axis direction is provided in the tubular casing, and plate-shaped stirring blades are sequentially attached to the rotating shaft in the axial direction in the direction orthogonal to the rotating shaft. In the structure, each stirring blade has a triangular shape, each side portion of the triangular shape is cut out, and an inclined surface inclined in the processing object feeding direction is formed by the cutout end surface of the cutout portion. It is possible to adopt the configured configuration.

As still another configuration of the present invention, stirring is provided in a tubular casing in the direction of the tubular axis, and plate-shaped stirring blades are sequentially attached to the rotating shaft in the axial direction in the direction orthogonal to the axis of rotation. In the blade structure, each stirring blade has a triangular shape, and has a scraping member protruding from the side surface in the axial direction of the rotation axis on the side surface of the apex of the triangle, and the shaft of the scraping member. It is possible to adopt a configuration in which an inclined surface inclined in the processing object feeding direction is formed on the directional surface by a notch.

The above configurations can be mutually adopted. For example, in the other configuration, an inclined surface inclined in the feed direction of the object to be processed is formed by a notch on the axial surface of the stirring blade, or each triangular side portion of the stirring blade is cut out. Therefore, the cutout end face of the cutout portion may form an inclined surface that is inclined in the feed direction of the object to be processed.

Since the present invention is configured as described above, the degree of freedom in designing the inclined surface for feeding the object to be processed is high, so that a kneading and stirring device having an appropriate feeding speed (residence time) can be obtained.

A first embodiment of the kneading and stirring device according to the present invention is shown, (a) is a cross-sectional plan view, (b) is a longitudinal front view, and (c) is a cut side view. Perspective view with the casing of the same embodiment removed. The stirring blade of the same embodiment is shown, (a) is a perspective view, (b) is a plan view, and (c) is a front view. A second embodiment of the kneading and stirring device according to the present invention is shown, (a) is a perspective view, (b) is a plan view, and (c) is a front view. A third embodiment of the kneading and stirring device according to the present invention is shown, (a) is a perspective view, (b) is a plan view, and (c) is a front view. A fourth embodiment of the kneading and stirring device according to the present invention is shown, (a) is a perspective view, (b) is a plan view, and (c) is a front view. A fifth embodiment of the kneading and stirring device according to the present invention is shown, (a) is a perspective view, (b) is a plan view, and (c) is a front view.

The first embodiment of the kneading and stirring device (kneader) according to the present invention is shown in FIGS. 1 to 3, and the kneading and stirring device of this embodiment is supplied with a polycondensation resin c having a low degree of polymerization as an object to be treated. , It is used as a polymerization apparatus that stirs the supplied resin (object to be treated) c to increase the degree of polymerization, and has a processing chamber inside a tubular casing 1 having a cross-sectional shape in which two circles having the same diameter intersect. Two screw blades 3a and 3b are provided at both ends of the casing 1, and a large number of stirring blades (paddles) 10 are provided between the two screw blades 3a and 3b along the axial direction. The rotating shafts 5 are arranged parallel to each other. Each stirring blade 10 has a plate shape and is orthogonal to the rotation axis 5.
The casing 1 is provided with a supply port 6 at the upper end on one end side and a discharge port 7 at the lower end on the other end side, and a jacket 8 for heating / cooling is provided on the outer peripheral surface excluding the supply port 6 and the discharge port 7. ing.

Both rotating shafts 5 have both ends protruding from the casing 1, and a motor (not shown) is connected to one of the protruding ends. By the motor, both rotating shafts 5 and 5 are the same in the same direction. It rotates at the rotation speed. Further, each of the screw blades 3a and 3b is inserted through the mounting hole (not shown) at the center of the screw blade 3a and 3b through the rotating shaft 5 and keyed to be attached so as to be orthogonal to the rotating shaft 5. Reference numeral 3a is a feed blade, and screw blade 3b on the discharge port 7 side is a return blade.
Therefore, the polycondensation resin (object to be processed) c supplied from the supply port 6 of the casing 1 to the processing chamber 2 by the rotational drive of the rotating shaft 5 is sent to the stirring blade 10 by the screw blades 3a. , It is sent back to the stirring blade 10 by the screw blade 3b, and gradually shifts to the other end side of the casing 1 while being kneaded and stirred by the stirring blade 10, and becomes a resin c'with a high degree of polymerization from the discharge port 7. It is discharged.

The stirring blades 10 are sequentially fixed at alternating positions in the axial directions of the rotating shafts 5 and 5, and are in the same phase along the axial direction of the rotating shafts 5. This phase can be made different from, for example, 60 degrees. These stirring blades 10 are made of, for example, SUS316 or the like, and as shown in FIG. 3, have a substantially regular triangular shape in which each of the three sides of the Reuleaux triangular plate piece (see FIG. 4) 11 is appropriately missing. A mounting hole 4 for the rotating shaft 5 is formed at the center thereof. The diameter of the rouleaux may be appropriately set, and is, for example, 118 mm.
Both side surfaces of the lacking side are inclined surfaces 12 in the circumferential direction and the radial direction of the axial center by cutting. That is, in FIG. 3C, the inclined surface 12 is gradually deepened in the direction of the arrow a and gradually deepened in the direction of the arrow b, and the inclination has an action of sending out the object to be processed c. Demonstrate.
Stirring protrusions (raising members) 13 projecting on both sides are formed at each apex of the stirring blade 10, and the protrusions (members) 13 promote stirring of the object to be processed c.

In the kneading and stirring device shown in FIG. 1 having the stirring blade 10 having this configuration, when the stirring blade 10 rotates in the direction of the arrow in FIG. 3 (c), the inclined surface 12 (lower side in FIG. 3 (b)) causes the stirring blade 10. , Axial and radial (delivery direction) forces of the rotating shaft 5 are applied to the object to be processed c to stir. It is also stirred by the stirring protrusion 13.
Therefore, the feed amount of the object to be processed c is appropriately set by appropriately setting the inclination angle of the inclined surface 12 in the a and b directions, the size of the stirring protrusion 13, the amount of protrusion to the side, and the like. Appropriate agitation is performed from the supply port 6 to the discharge port 7 with an appropriate residence time, and the object to be treated c'with appropriate polymerization moves.
In addition, in FIG. 3B, inclined surfaces 12 and 12 are formed by notches on both sides (upper and lower sides) of the plate piece 11, respectively. With such a configuration, the stirring blade 10 is shown in FIG. As shown in 3, the left-right (both sides) symmetry, that is, the left-right rotation symmetry with respect to the line passing through the center in the thickness direction orthogonal to the rotation axis 5, and the rotation axis of the stirring blade 10 without considering the left-right side surface thereof. Can be attached to 5.

In the above embodiment, the stirring blade 20 shown in FIG. 4 (feed inclined surface 22) does not lack each of the three sides of the Reuleaux triangular plate piece 11, and the shape of the stirring protrusion 13 is different. The stirring blade 30 (feed inclined surface 32) is shown in FIG.
In FIGS. 6 and 7, a part of each of the three sides of the Reuleaux triangular plate piece 11 is missing, but an inclined surface is formed on the side surface of the missing portion (FIG. 6) or formed on the stirring protrusion 13. The stirrer blades 40 and 50 are shown (feed inclined surfaces 42 and 52).
As described above, since the forming positions of the inclined surfaces 12, 22, 32, 42 and 52 can be appropriately set, the forming positions of the inclined surfaces 12, 22, 32, 42 and 52 are formed in consideration of the degree of stirring. , The inclination angle, and the shape of the stirring protrusion 13 are appropriately set in consideration of the degree of stirring and the like. That is, for example, also in the embodiments shown in FIGS. 6 and 7, the inclined surfaces 12, 22 and 32 on the side surface of the plate piece 11 shown in FIGS. 3 to 5 can be formed. In each of the embodiments shown in FIGS. 3 to 6, three protrusions (raising members) 13 and three inclined surfaces 12, 22, 32, and 42 are provided, and rotation is performed at intervals of 120 degrees around the rotation shaft 5. It is a position.
Therefore, the embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. The scope of the present invention is indicated by the scope of claims and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 Casing 2 Processing chamber 3a, 3b Screw blade 5 Rotating shaft 6 Supply port 7 Discharge port 10, 20, 30, 40, 50 Stirring blade 12, 22, 32, 42, 52 Inclined surface 13 Stirring protrusion c, c'Processed Thing (resin)

Claims (4)

A rotating shaft (5) in the tubular axial direction is provided in the tubular casing (1), and plate-shaped stirring blades (10, 20, 30) are sequentially attached to the rotating shaft (5) in the axial direction. The stirring blade structure is attached so that the plane of the stirring blade is orthogonal to the rotation axis (5), and the surface of the stirring blade in the axial direction, which is the plane of the stirring blade, reaches the other surface in the plate thickness direction of the stirring blade. no inclined surface inclined object to be processed feeding direction by notches (12, 22, 32) is formed, and the stirring blade, the left and right with respect to a line passing through the center in the thickness direction perpendicular to the rotation axis (5) The stirring blade is rotationally symmetric, and the stirring blade has a triangular shape in the axial direction, the rotation axis (5) passes through the center of the triangle, and the stirring blade rotates from the side surface to the side surface of the apex of the triangle. Having a scraping member (13) projecting in the axial direction of the shaft (5), the inclined surfaces (12, 22, 32) and the scraping member (13) form both side surfaces forming the plane of the stirring blade. A stirring blade structure for a kneading agitator, which is provided with three of each of the above-mentioned rotating shafts (5) and has rotating positions at intervals of 120 degrees. A rotating shaft (5) in the tubular axial direction is provided in the tubular casing (1), and a plate-shaped stirring blade (50) is sequentially attached to the rotating shaft (5) in the axial direction. It is a stirring blade structure attached so as to be orthogonal to the rotation axis (5), and each stirring blade (50) has a triangular shape in the axial direction, and is attached to the side surface of the apex of the triangle from the side surface. It has a scraping member (13) protruding in the axial direction of the rotating shaft (5), the rotating shaft (5) passes through the center of the triangle, and a notch is formed on the axial surface of the scraping member (13). A stirring blade structure for a kneading and stirring device, characterized in that an inclined surface (52) inclined in the feed direction of an object to be processed is formed. An inclined surface (12, 22, 32) inclined in the object feeding direction is formed on the axial surface of the stirring blade (50), which is the plane, by a notch that does not reach the other surface in the plate thickness direction of the stirring blade. 2. The stirring blade structure for a kneading and stirring device according to claim 2 . Each of the triangular side portions of the stirring blade (50) is cut out, and the cutout end surface of the cutout portion forms an inclined surface (42) inclined in the processing object feeding direction. The stirring blade structure for a kneading stirring device according to claim 2 .

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