JP2016028799A - Kneading and stirring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a kneading and stirring device where production efficiency is improved and weight of the device is reduced.SOLUTION: A self-cleaning type kneading and stirring device includes: two rotary shafts 5 arranged in parallel which rotate at the same rotary speed in the same direction; A plurality of stirring blades 4 installed to be perpendicular to each direction of the rotating shaft and eccentric to a shaft center of the rotating shaft; and a casing 1 where an inner circumferential surface for housing the rotary shaft and the stirring blade becomes a trajectory of an outer circumferential of the stirring blade, where a part of the outer circumferential of the stirring blade closes to the inner circumferential surface of the casing in accordance with rotation of the rotary shaft. At least a part of the stirring blade includes an opening 44 having a shape of a frame and communicating with the inside of the frame at an outer circumferential surface. For this reason, a flow of a material to be treated occurs from the opening of the outer circumferential surface to an opening at a side face inside the frame when stirring, stirring efficiency is improved by the flow and residence time is elongated, thereby, production efficiency is improved. Moreover, since the stirring blade has a shape of the frame and the outer circumferential surface of the stirring blade is opened so that weight of the stirring blade is reduced, it is possible to reduce weight of the device itself.SELECTED DRAWING: Figure 2

Description

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

  As this kind of kneading and stirring device, two rotating shafts arranged in parallel rotating at the same rotational speed in the same direction, stirring blades (paddles) attached in the axial direction of the respective rotating shafts, and the rotation A casing for housing the shaft and the stirring blade, and with the rotation of the rotating shaft, a part of the outer periphery of the stirring blade is close to the inner peripheral surface of the casing and at the same position in the axial direction of the two rotating shafts. There is a type in which a part of the outer periphery of one of the attached both agitating blades is close to the other outer peripheral surface, and the outer peripheral surface of the stirring blade and the inner peripheral surface of the casing are self-cleaning.

  In this self-cleaning kneading and stirring device, a polycondensation resin having a low degree of polymerization is supplied as an object to be processed, and there is an apparatus that stirs the resin to increase the degree of polymerization. There are two types: a continuous type that is performed automatically, and a batch type in which a constant amount of an object to be treated is fed into a kneading and stirring device and kneaded and stirred. The former is compact and high productivity can be obtained, but there is a problem that a sufficient residence time is difficult to obtain and a required degree of polymerization cannot be obtained. The latter can obtain a sufficient degree of polymerization, but the productivity is inferior to the former, and the throughput is determined by the amount of supply at one time. )There is a need to. The increase in size requires a large installation space, and the device becomes expensive.

  From such a situation, in a continuous self-cleaning kneading and stirring apparatus, the stirring blade is eccentric (offset) with respect to the rotating shaft, and a large turning radius can be obtained with a small diameter stirring blade. (See Patent Document 1, Abstract, FIGS. 1 to 9). This self-cleaning type kneading and stirring device with eccentric stirring blades can secure the residence time of the object to be processed several times that of the kneading and stirring device without stirring blades, and the polycondensation resin having a low polymerization degree can be secured. The degree of polymerization can be increased.

JP 2013-17980 A JP 2014-12344 A

  In a continuous self-cleaning kneading and agitating apparatus in which the agitating blades are eccentric, it is desired to enable more efficient production. Moreover, weight reduction is also desired.

  This invention makes it a subject to make further weight reduction while aiming at the further improvement in production efficiency under the above actual condition.

In order to achieve the above object, the present invention is configured such that the stirring blade has a frame shape and has an opening on the outer peripheral surface thereof leading to the frame.
In this way, when the workpiece is stirred by the stirring blade, the flow of the workpiece is generated from the opening on the outer peripheral surface to the opening on the inner side surface of the frame. This flow improves the stirring efficiency and increases the residence time. Become. For this reason, production efficiency is improved. Moreover, since the stirring blade is light-weighted by opening the outer peripheral surface of the stirring blade in a frame shape, the weight of the apparatus itself can be reduced.

  As one configuration of the present invention, two rotating shafts arranged in parallel and rotating in the same direction at the same rotational speed, and perpendicular to the axial direction of each rotating shaft and decentered from the axis of the rotating shaft, A plurality of stirring blades attached to each other, and a casing whose inner peripheral surface that accommodates the rotating shaft and the stirring blade becomes an outer locus of the stirring blade, and a part of the outer periphery of the stirring blade as the rotating shaft rotates In the self-cleaning type kneading and stirring device in which the outer peripheral part of one of the opposed stirring blades attached at the same position in the axial direction of both rotary shafts is close to the outer peripheral surface of A configuration in which at least a part of the stirring blade has a frame shape and has an opening leading to the inside of the frame on the outer peripheral surface thereof can be adopted.

  As another configuration of the present invention, two rotating shafts arranged in parallel and rotating in the same direction at the same rotational speed, and perpendicular to the axial direction of each rotating shaft and decentered from the axis of the rotating shaft. A plurality of agitating blades attached in sequence and a casing having an inner peripheral surface that accommodates the rotating shaft and the agitating blade as an outer locus of the agitating blade. In the self-cleaning type kneading and stirring device in which the portion is close to the inner peripheral surface of the casing, the stirring blades are alternately attached to one and the other of the two rotating shafts in the length direction, and each of the rotating shafts The stirring blade has a scraper extending in one of the length directions of the rotating shaft, and each stirring blade of the other rotating shaft has a scraper extending in the other of the length directions of the rotating shaft. Each of the other rotating shafts parallel to the shaft rotation Close to the outer peripheral surface of 拌翼, and at least a portion of the stirring blade, it is possible to adopt a configuration having an opening communicating with the inner frame in the outer peripheral surface thereof in a frame shape.

  In this configuration, the stirring blades are alternately attached to the two rotating shafts in a staggered pattern in the length direction, and the scraper of each stirring blade of one rotating shaft is on the side of each stirring blade of the other rotating shaft. Therefore, as the rotating shafts rotate, each scraper comes close to the outer peripheral surface of each stirring blade and scrapes off the object to be treated that adheres to the outer peripheral surface of the stirring blade.

In these configurations, each of the stirring blades may be configured such that adjacent stirring blades are fixed to each other at the axis of the rotating shaft and the rotating shaft is omitted. With this configuration, further weight reduction can be achieved.
The agitating blade may have a shape in which the tertiles on the circumference of a circle eccentric from the rotation axis are apexes, and the vertices are connected by outer convex arcs.

  Since the present invention is configured as described above, the production efficiency can be improved and the weight can be reduced.

Longitudinal front view of the first embodiment of the kneading and stirring apparatus according to the present invention Cross-sectional plan view of FIG. 1B cross-sectional view The perspective view which removed the casing of the embodiment It is an enlarged view of the principal part of FIG. 2, (a) is a perspective view, (b) is a left view, (c) is a front view. Shape explanatory drawing of the stirring blade of the same embodiment Action explanatory diagram of the stirring blade of the same embodiment The principal part perspective view which removed the casing of the said 2nd Embodiment Main part enlarged transverse plan view of the third embodiment The same embodiment is shown, (a) is a perspective view of the main part with the casing removed, (b) is a perspective view of one stirring blade, and (c) is a right side view. Main part enlarged transverse plan view of the fourth embodiment The same embodiment is shown, (a) is a perspective view of the main part with the casing removed, (b) is a perspective view of one stirring blade, and (c) is a right side view. The principal part perspective view which removed the casing of the 5th embodiment Cross-sectional plan view of the sixth embodiment Cross-sectional plan view of the seventh embodiment The perspective view which removed the casing of the embodiment Front view of a partially cut-out part of the same embodiment The stirring blade of the embodiment is shown, (a) is a perspective view, (b) is a side view, and (c) is a cut front view. Action explanatory diagram of the stirring blade of the same embodiment (A)-(c) is each sectional drawing of other embodiment.

One embodiment of a kneading and stirring apparatus (kneader) according to the present invention is shown in FIGS. 1 to 5, and the kneading and stirring apparatus of this embodiment is supplied with a polycondensation resin a having a low degree of polymerization as an object to be processed. The agitated resin is used as a polymerization apparatus for increasing the degree of polymerization, and a screw blade 3a is provided at both ends in the processing chamber 2 inside the cylindrical casing 1 having a cross-sectional shape where two circles of the same diameter intersect. 3b, two rotating shafts 5 provided with a large number of stirring blades (paddles) 4 along the axial direction are arranged in parallel with each other between the screw blades 3a and 3b.
The casing 1 is provided with a supply port 6 at the upper end of one end and a discharge port 7 at the lower end of the other end, and a jacket 8 for heating and cooling is provided on the outer peripheral surface excluding the supply port 6 and the discharge port 7. ing.

Both the rotating shafts 5 are protruded from the casing 1 at both ends, and a motor (not shown) is connected to one protruding end of the rotating shafts 5 so that the rotating shafts 5 and 5 are identical in the same direction. It rotates at the rotation speed. Further, each screw blade 3a, 3b is inserted into the rotary shaft 5 from the center mounting hole and keyed and attached to the rotary shaft 5, and the screw blade 3a on the supply port 6 side is a feed blade, The screw blade 3b on the discharge port 7 side is a return blade.
For this reason, when the rotating shaft 5 is rotationally driven, the polycondensation resin (object to be processed) a supplied from the supply port 6 of the casing 1 to the processing chamber 2 is sent to the stirring blade 4 by the screw blade 3a. The resin blade a is fed back to the stirring blade 4 by the screw blade 3b, and gradually moves to the other end side of the casing 1 while being kneaded and stirred by the stirring blade 4 to become a resin a ′ having a high degree of polymerization from the discharge port 7. Discharged.

  The agitating blades 4 are fixed to the rotary shafts 5 and 5 in sequence at the same position in the axial direction and close to each other in the same phase (see FIGS. 1 and 2). 5 are arranged so that the phase is shifted by 45 ° in the same circumferential direction along the axial direction of 5 (see FIGS. 1 and 2). The phase difference is arbitrary such as 60 degrees.

These stirring blades 4 is made of, for example, SUS316, etc., as shown in FIG. 4, trisected position point on the circumference of the circle C that the axis _{0 1} eccentric from _{0 second} rotational shaft 5 (theta: 120 (Degree interval quantile) c ₁ , c ₂ , c ₃ (generic symbol: c) as vertices, and the vertices c are connected by outer convex arcs. Each outer convex arc is centered on the opposite vertex c (for example, the arc between the vertices c _{1 and} c ₂ is centered on the vertex c ₃ ). For example, when the arc radius is 150 mm, The inner diameter of the casing 1 is 227 mm, the diameter of the circle C is 171 mm, and the amount of eccentricity is 28 mm. Mounted embodiment of the rotary shaft 5 of the stirring blade 4, the axis 0 ₁ of the rotary shaft 1 is positioned within a triangle formed by the three vertices c _1, c _2, c _3.

As shown in FIGS. 5 (a) to 5 (h), a set of two stirring blades 4 fixed to the respective rotating shafts 5 at the same position in the axial direction by using the stirring blades 4 as described above. When the rotating shafts 5 and 5 are rotated in the same direction (counterclockwise in the figure) at the same rotational speed, the state where the apex c of one stirring blade 4 is close to the other stirring blade 4 is appropriately maintained. The object to be processed adhered to the outer periphery is removed by rotating eccentrically. When the stirring blade 4 rotates eccentrically, as shown in FIG. 1 and FIG. 1C, one vertex c ₁ moves in a state of being close to the inner peripheral surface of the casing 1, and the workpiece on the inner peripheral surface is moved. Scratch up. That is, self-cleaning is performed.

  In this embodiment, each stirring blade 4 is divided into a triangular frame-shaped blade piece 41 and a pair of solid triangular blade pieces 42, and the gap between the two pieces 41, 42 is lacking in the substantially equilateral triangle shape. Thus, a gap 43 reaching the outer surface of the rotating shaft 5 is formed between the two-dot chain lines in FIG. For this reason, when the stirring blade 4 rotates eccentrically, the workpiece a enters the gap 43 and is stirred, and the stirring efficiency is improved as compared with the case where the gap 43 does not exist. The solid triangular wing piece 42 may also have a frame shape.

As shown in FIG. 3, the triangular frame-shaped wing piece 41 is obtained by superposing a pair of triangular frame-shaped pieces 41 a via intervening pieces 41 b and inserting and fixing spring pins 41 c to the intervening pieces 41 b. Due to the interposition of the interposition piece 41b, the triangular frame-shaped wing piece 41 has an air gap (cavity) 44 opened on the outer peripheral surface and the side surface. The triangular frame piece 41a and the interposition piece 41b may be integrated by welding.
Further, a scraper 45 that protrudes in the axial direction of the rotary shaft 5 from the side surface is provided at the apex c ₁ portion of the triangular frame wing piece 41 and the apex c ₂ and c ₃ portions of the solid triangular wing piece. The scraper 45 is fixed by a pin 41c and reaches near the side surface of the adjacent stirring blade 4. If there is no interference, the scraper 45 may overlap in the radial direction of the rotating shaft 5 of the adjacent stirring blade 4 (the tip of the scraper 45 may reach the outer peripheral surface of the stirring blade 4). The scraper 45 may be any shape as long as it can perform a scraper action such as a round bar or a square bar. The scraper 45 may also be integrated with the blade pieces 41 and 42 by welding.

  An attachment portion of each blade piece 41, 42 to the rotating shaft 5 is an arc-shaped recess 46 that is the same as the outer peripheral arc of the rotating shaft 5 (see FIG. 3). The wing pieces 41, 42 are attached to the rotary shaft 5 by welding b around the fitted wing pieces 41, 42 and the rotary shaft 5 (the entire circumference of the wing pieces 41, 42). Each of the recesses 46 is an opening having a size within a half outer periphery of the rotating shaft 5, and the blade pieces 41 and 42 can be fitted to the rotating shaft 5 from the outer peripheral surface of the rotating shaft 5.

Thus, if each blade piece 41 and 42 is attached to the rotating shaft 5 by welding b, compared with the attachment by the conventional stirring blade 4 being inserted in the rotating shaft 5 and fitting through a key, the blade pieces 41 and 42 are attached. Since the thickness of the fitting portion with the rotary shaft 5, that is, the thickness of the portion forming the recess 46 is thin and sufficient, the stirring blade 4 can be made small if the stirring ability is the same.
Moreover, since the welding beat b exists in the welding part with the rotating shaft 5 of each blade piece 41 and 42, each adjacent stirring blade 4 cannot be made to contact | connect and attach conventionally. For this reason, there is a possibility that the object to be processed (kneaded material) a stays between the stirring blades 4 and 4, but the kneaded object (object to be processed) a is scraped (dropped) by the scraper 45. Since they are moved to the rotating shaft 5 side, they are sufficiently kneaded without stagnation.

As described above, the kneading and stirring device is configured to provide a resin that adheres to the outer periphery of the other stirring blade 4 at one vertex c of one stirring blade 4 when each pair of triangular stirring blades 4 rotates eccentrically (see FIG. The object to be processed) a is scraped off and reliably removed, and the resin a adhering to the inner wall of the processing chamber 2 is scraped off at the apex c ₁ of at least one stirring blade 4 to reliably remove it. The self-cleaning performance is superior to that using the stirring blade (see FIG. 16 (c)), and it is possible to reliably prevent troubles caused by the solidified resin a in the processing chamber 2 and to operate stably for a long time. can do.

Moreover, since the cavity (gap) 44 is provided in the outer peripheral surface and side surface of each stirring blade 4, while the resin a is stirred with the stirring blade 4, it becomes a thin film in the cavity 44, and a polymerization reaction, a solvent, etc. Volatilization is promoted and processing can be performed efficiently. In addition, since the stirring blade 4 has a frame shape and its outer peripheral surface and side surfaces are hollow 44 and is lightweight, the apparatus itself is also lightweight.
Further, since each stirring blade 4 is composed of a triangular frame-shaped blade piece 41 and a solid triangular blade piece 42, while the resin a is being stirred by the stirring blade 4, in the gap 43 between both blade pieces 41, 42. Becomes a thin film, and the polymerization reaction and the volatilization of the solvent are promoted, so that the treatment can be performed efficiently.

Figure 6 shows a second embodiment, this embodiment is provided with a scraper 45 on either side of the triangular frame-shaped wings 41, the scraper 45, projecting respectively from the vertex c ₁ and other corners of the wings 41 The piece 41a ′ (half piece of the triangular frame-like piece 41a) and the connecting piece 41b of the two pieces are U-shaped, and the scraper of the solid triangular wing piece 42 is omitted. The connecting piece 41 b becomes the scraper 45.
At this time, it is not necessary to provide the scraper 45 on the stirring blades 4 at both ends of the rotating shaft 5. On the other hand, if a scraper 45 directed to the adjacent stirring blade 4 is provided to the stirring blade 4 at both ends, the scraper 45 serving as the scraper 45 (left side in FIG. 6) is omitted from the adjacent stirring blade 4. Only the other (right side in FIG. 6) scraper 45 may be provided. For this reason, it is not necessary to provide the scraper 45 on both sides of all the stirring blades 4. That is, the scraper 45 is appropriately provided on each stirring blade 4 within a range where the outer peripheral surface of the stirring blade 4 and the inner peripheral surface of the casing can be scraped up.

FIG. 7 shows a third embodiment. In this embodiment, the scraper 45 of the triangular frame-shaped wing piece 41 is omitted, a part of the solid triangular wing piece 42 is extended in the axial direction of the rotating shaft 5, and the tip thereof An L-shaped scraper 45 'is provided at the edge. The scrapers 45 ′ are alternately positioned on the left and right (axial direction) in the same circumferential direction, and reach the outer circumferential surface as long as they do not approach or interfere with the adjacent stirring blades 4.
FIG. 8 shows a fourth embodiment. In this embodiment, in FIG. 7, both ends of the triangular triangular blade piece 42 are extended in the axial direction of the rotary shaft 5 and L-shaped scrapers 45 ′ are formed at both end edges thereof. Is provided.
In the third and fourth embodiments, similarly to the above, the scraper 45 ′ can be appropriately provided as long as the outer peripheral surface of the stirring blade 4 and the inner peripheral surface of the casing can be scraped up.

  In the third and fourth embodiments, the scraper 45 ′ is provided between the adjacent stirring blades 4, 4 by extending the end of the solid triangular blade piece 42, but is separated from the solid triangular blade piece 42. It can also be provided. At this time, the scraper 45 ′ can be provided at an arbitrary position in the circumferential direction of the rotating shaft, not in the same axial direction as the solid triangular blade 42 and the rotating shaft 5.

  FIG. 9 shows a fifth embodiment in which the scrapers 45 and 45 ′ are omitted. In this embodiment, the respective stirring blades 4 are made as close as possible.

FIG. 10 shows a sixth embodiment. In this embodiment, the stirring blade 4 is not fixed to each rotary shaft 5 at the same position in the axial direction. The stirring blades 4 of one rotating shaft 5 are alternately attached to the other in the length direction, and have a scraper 45 extending in one of the length directions of the rotating shaft 5, and each of the other rotating shafts 5. The stirring blade 4 has a scraper 45 extending to the other side in the length direction of the rotating shaft 5.
In this embodiment, the stirring blades 4 (41, 42) are alternately attached to the two rotating shafts 5, 5 in a staggered pattern in the length direction, and each stirring blade 4 of one rotating shaft 5 is provided. Since the scraper 45 extends to each stirring blade 4 side of the other rotating shaft 5, the scraper 45 comes close to the outer peripheral surface of each stirring blade 4 as the both rotating shafts 5 rotate. The workpiece a adhering to the outer peripheral surface is scraped off.

As described above, in each of the above embodiments, as described above, when the stirring blade 4 rotates eccentrically, the resin a adhered to the outer periphery of the other stirring blade 4 by one apex of the one stirring blade 4 or the scraper 45. The resin adhered to the inner wall of the processing chamber 2 at the apex c of at least one stirring blade 4 is scraped off and reliably removed and self-cleaning is performed.
Further, each stirring blade 4 is composed of a triangular frame-shaped blade piece 41 and a solid triangular blade piece 42, and the cavity 44 is provided on the outer peripheral surface and the side surface of each stirring blade 4, so that the resin is stirred by the stirring blade 4. In the meantime, a thin film is formed in the cavity 44, and the volatilization of the polymerization reaction and the solvent is promoted, so that the treatment is performed efficiently.

11 to 15 show a seventh embodiment, in which a part of the rotating shaft 5 is omitted.
For this reason, each stirring blade 4 has a pair of triangular frame-shaped blade pieces 51, 51 larger than the triangular frame-shaped blade piece 41 having a boss portion 53 serving as a rotating shaft portion, and a boss positioned between the blade pieces 51. It has a triangular frame-shaped wing piece 52 that does not have a portion 53, and each of the wing pieces 51, 52 is integrated with a spring pin 41c with a connecting member 54 interposed therebetween. The central wing piece 52 can also be provided with a boss portion 53. Further, the blade pieces 51 and 52 and the connecting member 54 can be integrated by welding. In the boss portion 53, a fitting pin 55 or a hole 55a into which the pin 55 is fitted is formed at the center, and a bolt hole 56 is formed around the fitting pin 55.

  As shown in FIG. 13, each stirring blade 4 of this embodiment is fastened and integrated with a bolt / nut 58 via a spacer 57. The spacer 57 can be omitted.

In this embodiment, as shown in FIGS. 15A to 15F, when the coupling body of the stirring blades 4 is rotated in the same direction (counterclockwise in the same figure) at the same rotational speed, While maintaining the state in which one vertex of 4 is close to the other stirring blade 4 as appropriate, it rotates eccentrically to remove the objects to be treated adhered to each other's outer periphery. Further, when the eccentric rotation of the stirring blade 4, as shown in the figure, moves in a state in which one vertex c ₁ is close to the inner circumferential surface of the casing 1, scraped an object to be processed in the inner peripheral surface thereof. That is, self-cleaning is performed.
At this time, since the stirring blade 4 is constituted by the frame-shaped blades 51 and 52 and is light, even if the rotating blade 5 is not provided in the portion of the stirring blade 4, the strength is sufficient. For this reason, by rotating, the above-mentioned action is effectively exhibited by the fact that the stirring blade 4 has a frame shape and the outer peripheral surface has the opening 44 communicating with the inside of the frame.

  Incidentally, the kneading and stirring device of each of the above embodiments, like the kneading and stirring device described in Patent Document 1, kneads and stirs an object to be processed such as a general powder, liquid, high-viscosity fluid, or the like. It can be used for separation treatment of gas from the liquid or reaction treatment of liquid or high viscosity fluid with gas. Even when such a method of use is adopted, it is possible to operate stably for a long time by having a self-cleaning performance superior to the conventional one as described above.

In each of the above-described embodiments, the screw blades 3 a and 3 b are provided at both ends of each rotating shaft 5, but a configuration in which the stirring blade 4 is provided over the entire length of the processing chamber 2 may be employed. At this time, the stirring blade 4 itself is formed in a helical shape for sending the object to be discharged to the discharge side below the supply port 6, and the stirring blade 4 itself is formed in a reverse helical shape for reversely sending the object to be processed above the discharge port 7. can do. Further, the stirring blade 4 does not have to be entirely frame-shaped and has an opening that communicates with the outer peripheral surface of the stirring blade 4, and only a part thereof, for example, a central part can be used.
Further, the shape of the stirring blade 4 is such that the solid triangular blades 42 shown in FIG. 16 (a) are integrated, the whole shown in FIG. 16 (b) is framed, or the circle shown in FIG. A part of the outer periphery of the stirring blade 4 approaches the inner peripheral surface of the casing 1 as the rotary shaft 5 rotates, and a part of the outer periphery of the stirring blade 4 is the other stirring blade. Any one may be used as long as it has a self-cleaning function close to the outer peripheral surface. Further, in each of the embodiments shown in FIG. 16, the scrapers 45 and 45 ′ can of course be attached to one side or both sides of the stirring blade 4.
In each of the above embodiments, the stirring blade 4 is attached to the rotating shaft 5 by welding other than the embodiments shown in FIGS. 11 to 15. However, as described in Patent Document 2, an attachment hole is formed in the stirring blade 4. In addition, it is possible to adopt a conventionally well-known attachment mode in which the stirring blade 4 is inserted into the rotary shaft 5 through the hole and keyed.

DESCRIPTION OF SYMBOLS 1 Casing 2 Processing chamber 3a, 3b Screw blade 4 Agitation blade 5 Rotating shaft 6 Supply port 7 Discharge port 41, 51, 52 Triangular frame-shaped blade piece 42 which forms stirring blade
53 Stirring blade boss 57 Spacer 58 Bolt / Nut

Claims (4)

Two rotating shafts (5, 5) arranged in parallel and rotating in the same direction at the same rotational speed, and perpendicular to the axial direction of each rotating shaft (5) and decentered from the axis of the rotating shaft. A plurality of stirring blades (4) attached to each other, and a casing (1) in which the inner peripheral surface for housing the rotating shaft (5) and the stirring blade (4) is the outer locus of the stirring blade. Along with the rotation of the rotating shaft (5), a part of the outer periphery of the stirring blade (4) approaches the inner peripheral surface of the casing (1) and at the same position in the axial direction of both the rotating shafts (5). In the self-cleaning kneading and stirring apparatus in which one outer peripheral part of both of the opposed stirring blades attached is close to the other outer peripheral surface,
At least a part of the stirring blade (4) has a frame shape and has an opening (44) communicating with the outer peripheral surface of the frame. Two rotating shafts (5, 5) arranged in parallel and rotating in the same direction at the same rotational speed, and perpendicular to the axial direction of each rotating shaft (5) and decentered from the axis of the rotating shaft. A plurality of stirring blades (4) attached to each other, and a casing (1) in which the inner peripheral surface for housing the rotating shaft (5) and the stirring blade (4) is the outer locus of the stirring blade. A self-cleaning kneading and stirring device in which a part of the outer periphery of the stirring blade (4) is close to the inner peripheral surface of the casing (1) as the rotating shaft (5) rotates,
The stirring blades (4) are alternately attached to one and the other of the rotary shafts (5, 5) in a zigzag manner in the length direction thereof, and the stirring blades ( 4) has a scraper (45) extending in one of the length directions of the rotating shaft, and each stirring blade (4) of the other rotating shaft (5) has a scraper (45) extending in the other of the length directions of the rotating shaft. Each scraper (45) is close to the outer peripheral surface of each stirring blade (4) of the other rotary shaft (5) parallel to the rotation of both rotary shafts (5),
The self-cleaning kneading and stirring apparatus is characterized in that at least a part of the stirring blade (4) has a frame shape and has an opening (44) communicating with the outer peripheral surface of the stirring blade (4).   Each said stirring blade (4) is the structure which fixed the adjacent stirring blade in the axial center of the said rotating shaft (5), and abbreviate | omitted the said rotating shaft (5). A self-cleaning kneading and stirring apparatus according to 1. The agitating blade (4) has a cuboid (c ₁ , c ₂ , c ₃ ) on the circumference of a circle (C) decentered from the rotation axis (5) as a vertex, and an outer convex between the vertices. The self-cleaning type kneading and stirring apparatus according to any one of claims 1 to 3, wherein the self-cleaning type kneading and stirring apparatus has a shape connected by arcs.

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