JPH04235727A - Stirring apparatus - Google Patents

Abstract

PURPOSE:To perform continuous operation by applying feed action to an object to be treated and to effectively perform self-cleaning and degassing in a stirring apparatus equipped with the paddles respectively provided to a plurality of the rotary shafts rotating in synchronous relationship within a container. CONSTITUTION:A plurality of paddles (9, 10) are respectively provided to a plurality of the rotary shafts (7, 8) synchronously rotating in the same direction within a container (1) and scrapers (30, 31) each having the length almost corresponding to the interval between the paddles are provided to the leading end of the paddles (9, 10) to constitute a stirring apparatus and many disc-shape stirring plates (11a, 11b, 11c,... 12a, 12b, 12c...) are mounted on the rotary shafts (7, 8) so as to be successively eccentric in the same direction around the axes of the rotary shafts and provided so that the inner wall of the container and the stirring plates and mutual stirring plates are close to each other so as to leave slight gaps.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a stirring device for stirring and mixing substances such as high viscosity fluids, slurry substances, powders, etc.
For example, the present invention relates to a stirring device suitable for use as a polymerization reactor, a desolvation device, a demonomer device in a polymer production process, or a mixer for various raw materials in the food industry.

0002

2. Description of the Related Art Conventionally, there have been various types of stirring devices with self-cleaning functions for treating particularly strongly adhesive substances. One of them is a stirring device in which axial paddles are attached to a rotating shaft with intervals in the axial direction, and a scraper having a length approximately corresponding to the spacing is attached to the tip of the paddle. However, this stirring device is usually composed of a combination of paddles having the same shape from the inlet to the outlet.

0003

SUMMARY OF THE INVENTION The conventional stirring apparatus described above has the following disadvantages depending on its use.

(1) Due to its characteristics, the length of the scraper attached to the tip of the paddle is relatively long. There is a concern that devolatilization may not be carried out smoothly because the evaporation acts to block the holes.

(2) From the characteristics of the paddle of the stirring device,
For some substances, it may be difficult to continuously pump them from the inlet to the outlet.

The present invention aims to provide a stirring device that can solve the above-mentioned problems.

[0007]

[Means for Solving the Problems] The present invention provides a plurality of rotating shafts arranged in a container and driven to rotate synchronously in the same direction, and a plurality of rotating shafts fixed to each of the rotating shafts to perform a stirring action. In the stirring device, the paddles are attached to the paddles at intervals in the axial direction, and a scraper having a length approximately corresponding to the interval at the tip of each paddle is connected to the rotating shaft. mounted in parallel,
In a part of the stirring device, a plurality of disk-shaped stirring plates are attached to each of the rotating shafts, eccentrically arranged in the same direction around the axis of each rotating shaft, and each of the stirring plates is connected to the inner wall of the container. The plates and stirring plates are provided close to each other with a slight gap left.

[0008]

[Operation] In the present invention, a stirring action is performed by the rotation of a plurality of paddles fixed to each rotating shaft and the scraper at the tip thereof, and the rotation of the paddles and the scraper at the tip of the paddles causes adjacent objects to approach each other. relative movement,
Each part inside the container, such as the inner wall of the container, paddle, and scraper, is self-cleaned.

Further, in a part of the stirring device, a plurality of disc-shaped stirring plates are eccentrically attached to each rotating shaft and are sequentially shifted in the same direction around the axis of the rotating shaft, and each of the stirring plates Because the inner wall of the container, the stirring plate, and the stirring plates are placed close to each other with a small gap, the multiple stirring plates form an intermittent screw around the rotation axis, and the processed material A strong feeding action is generated,
The paddle and scraper effectively perform stirring and feeding of the processed material.

Furthermore, since the width (thickness) of each stirring plate attached to each of the rotating shafts is small, when a devolatilization nozzle is installed in the part of the container where the stirring plate is installed, the stirring plate is used to prevent evaporation. The volatile nozzle will not be blocked.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a horizontal section in the axial direction of a horizontal stirring and mixing device according to an embodiment of the present invention, FIG. 2 is a longitudinal section taken along the line II--I in FIG. 1, and FIG. Vertical section along, Figure 4
is a longitudinal section taken along line III-III in FIG. Further, FIG. 5 is a vertical cross section taken along the line IV-IV in FIG.

The horizontal cylindrical container 1 is formed into a cocoon shape by combining two circles of the same size with a part of the cross section cut out. 3 are provided near both ends thereof. Further, the container 1 is provided with a nozzle stub 4 for devolatilizing near the inlet nozzle 2, and a nozzle 5 for devolatilizing at an intermediate portion. Further, the container 1 has rotating shafts 7 and 8 provided horizontally at the centers of two circles forming the container 1, respectively, and is rotatable with respect to the container 1. A plurality of paddles 9, 10 and a plurality of disk-shaped stirring plates 11 are mounted on the rotating shafts 7, 8 in the container 1, respectively.
a, 11b, . . .; 12a, 12b, . ing.

A plurality of paddles 9 are fixed to the rotating shaft 7 at predetermined intervals. Each paddle 9 is formed into a thick plate having a spindle-shaped (convex lens-like) cross section with a bulge in the center and pointed ends, and is attached to the rotating shaft 7 in a plane orthogonal thereto. Further, the paddles 9, which are adjacent to each other in the axial direction of the rotating shaft 7, are out of phase by 90 degrees around the axis. Further, the tip of each of these paddles 9 is arranged so that it can face the inner wall of the container 1 and a corresponding paddle 10 of another rotating shaft 8, which will be described later, with a slight clearance depending on its rotational angular position. Dimensions are selected.

On the other hand, a plurality of paddles 10 having a spindle-shaped cross section are similarly fixed to the rotating shaft 8. Each paddle 10 is provided at the same position in the axial direction corresponding to the paddle 9, and has a phase of 90 degrees with respect to the corresponding paddle 9.
It is attached to the rotating shaft 8 with a degree deviation. Further, each tip of each paddle 10 is connected to the inner wall of the container 1 with a slight clearance depending on the rotational angular position of the corresponding paddle 9.
Its dimensions are selected so that it can face the

Further, the rotating shafts 7 and 8 are round shafts 21 and 8, respectively.
22 and a shaft cover 23 having a pseudo-square cross section on its outer periphery,
24 (see Fig. 5), the same round shaft 21,
Both ends of 22 are sealed by seals 50.

Furthermore, scrapers 30 and 31 each having a pseudo-triangular cross section corresponding to the cross-sectional shape of the tips are fixed to the tip ends of the paddles 9 and 10 in parallel with the rotating shafts 7 and 8, respectively. Each scraper 30, 31 has a length approximately corresponding to the spacing between adjacent paddles 9, 9; They are facing each other across the clearance.

Looking at the adjacent paddles 9, 9 and 10, 10 attached to the rotating shafts 7 and 8, respectively, as shown in FIGS. 1 and 2, the scrapers 30, 31 of one of the paddles 9, 10 are the other paddle 9, 10 respectively
The scrapers 30, 31 of the other paddles 9, 10 extend in the axial direction of the rotating shafts 7, 8 toward one of the paddles 9, 10, respectively, in the opposite direction. The lateral tips of each scraper 30 face the side surface of the paddle 9, and the lateral tips of each scraper 31 closely oppose the side surface of the paddle 10. In this way, a plurality of sets of two adjacent paddles are attached to each rotating shaft. The tips of each of the scrapers 30 and 31 are located on a line equidistant from the axes of the rotating shafts 7 and 8, so that the tips of each of the scrapers 30 and 31 are at the rotational angular position of the rotating shafts 7 and 8. a shaft cover 2 having a surface that is continuous with the inner wall of the container 1 and the paddle of the other rotating shaft with a slight clearance therebetween;
3 and 24.

Further, as shown in FIG. 5, a scraper 30
, 31 and the shaft covers 23, 24, the scrapers 31, 30 attached to the paddles of the other adjacent rotating shaft enter into each other as they rotate, and when they enter, the scrapers 30 The dimensions are selected such that the circumferential surface of the scraper 31 on the shaft center side and the circumferential surface of the scraper 31 on the shaft center side are close to each other with a slight clearance.

On the other hand, a portion 11A consisting of stirrers 11a, 11b, . . . and a portion 1 consisting of stirring plates 12a, 12b, .
2A is provided at the end of the rotating shafts 7 and 8 on the side where the inlet nozzle 2 and the devolatilization nozzle 4 are provided, and also includes a portion 11B and the stirring plate 12, which also consist of stirring plates 11a, 11b, . . .
The portion 12B consisting of a, 12b, .

As shown in FIGS. 3 and 4, each stirring plate 11
a, 11b, ...; 12a, 12b, ... The axial horizontal cross section of the rotating shafts 7, 8 is a circle having a diameter equal to the distance OP between the centers of the rotating shafts, and the respective centers A1, B1; A2, B
2 ; When rotating in the same direction and at the same rotational angular velocity around ..., the stirring plates 11a and 12a, 11b and 12b,
... Stirring plates 11a, 11b,... to prevent comrades from interfering with each other.
is attached to the rotating shaft 7, and stirring plates 12a, 12b, . . . are attached to the rotating shaft 8. Furthermore, each stirring plate 11a and 12a, 1
1b and 12b, ... centers A1, B1; A2, B2
A1 does not coincide with the axes O and P of the rotating shafts 7 and 8.
, B1 ; A2 , B2 ;... are respectively centered on the axis O,
It is arranged to be eccentric in the same direction and the same distance away from P. In addition, stirring plates 11a fixed to each rotating shaft,
11b, 11c...; 12a, 12b, 12c... are eccentrically attached to each rotating shaft so that their centers are sequentially shifted in one direction around the axes O and P of each rotating shaft, and Stirring plates 11a, 12a; 11b, 12b
;11c, 12c;... are located at a slight interval from each other, and each stirring plate is configured to rotate with the inner wall of the container 1 at a slight interval.

Therefore, the stirring plates 11a adjacent to each other
, 11b, 11c... and 12a, 12b, 12c,... are centered around the axes O, P of the rotating shafts 7, 8, which are the centers of revolution.
It will be moved sequentially in one direction centering on
Stirring plates 11a, 11b, 11c,...; 12a, 12b,
12c, . . . themselves form an intermittent screw, and as they rotate, a strong processing material feeding action is generated.

In this embodiment configured as described above, the parts 11A, 11B of the rotating shaft 7 and the parts 12A, 12A of the rotating shaft 7,
Stirring plates 11a, 11b, 11c... provided in 12B;
12a, 12b, 12c, . . . rotate about the rotation axis, a feeding action is applied to the processed material in the container 1, and the processed material moves in the axial direction within the container 1 from the inlet nozzle 2 to the outlet nozzle 3. sent to. Further, since each stirring plate rotates with a slight interval from the inner wall of the container 1, the inner wall of the container 1 is self-cleaned.

[0024] Furthermore, as described above, the material to be processed that is sent in the axial direction within the container 1 is subjected to an agitation effect due to the rotation of the paddles 9, 10 and the scrapers 30, 31 caused by the driving rotation of the rotating shafts 7, 8. and then taken out from the outlet nozzle 3.

On the other hand, at the same time as the stirring action described above, each part inside the container 1 is self-cleaned by the cleaning action described below. That is, the inner wall of the container 1 is cleaned by moving the tips of the paddles 9, 10 and the scrapers 30, 31 close to each other. Further, the curved peripheral surfaces of the paddles 9 and 10 are cleaned by moving their tips close to each other. Furthermore, the planar side surfaces of the paddles 9 and 10 and the lateral tip surfaces of the scrapers 30 and 31 facing them, respectively, are cleaned by moving close to each other. For example, the planar side surface of the paddle 9 moves relatively close to the side tip surface of the scraper 31, and the opposing surfaces thereof are mutually cleaned. Further, the circumferential surfaces of the scrapers 30 and 31 are mutually cleaned by moving the scrapers 30 and 31 of other rotating shafts so that their tips and circumferential surfaces are brought close to each other. In this way, the paddle 9 due to the rotation of the rotating shafts 7 and 8
, 10, and the container 1 due to the relative movement of the scrapers 30 and 31.
The surface of each part inside can be cleaned.

As mentioned above, in this embodiment, the stirring plate 11a
, 11b, ...; 12a, 12b, ..., the processing material is moved to the paddles 9, 10 and the scrapers 30, 3.
When passing through the container 1, the materials are sufficiently stirred and mixed, and then the treated material can be continuously sent out of the container 1.

[0027] Also, stirring plates 11a, 11b,...; 12a
, 12b, ... and paddles 9, 10 and scrapers 30, 3
1 allows the inner wall of the container 1 and each part within the container to be self-cleaned.

Furthermore, stirring plates 11a, 11b,...;1
2a, 12b, ... have short widths, so they do not block the devolatilization nozzles 4, 5 of the container 1, and volatile matters from the processed material are smoothly discharged as they are stirred and mixed, resulting in a devolatilization effect. without interfering with

[0029]

[Effects of the Invention] As explained in detail above, the present invention has the following features:
By having the structure described in the claims, the inner wall of the container and each part inside the container can be mechanically self-cleaned, and continuous operation can be performed by the feeding action of the stirring plate. At the same time, devolatilization can be carried out smoothly.

[Brief explanation of the drawing]

FIG. 1 is an axial horizontal cross-sectional view of a stirring device according to an embodiment of the present invention.

FIG. 2 is an axial cross-sectional view taken along line II in FIG. 1;

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

FIG. 4 is a longitudinal sectional view taken along line III-III in FIG. 1;

FIG. 5 is a longitudinal cross-sectional view taken along line IV-IV in FIG. 1;

[Explanation of symbols]

Claims (1)

[Claims] 1. A stirring device comprising a plurality of rotating shafts disposed in a container and driven to rotate synchronously in the same direction, and a plurality of paddles fixed to each of the rotating shafts to perform a stirring action. In the apparatus, the paddles are attached to the rotating shaft at intervals in the axial direction, and a scraper having a length approximately corresponding to the spacing is attached to the tip of each paddle in parallel to the rotating shaft, and A plurality of disk-shaped stirring plates are attached to a part of the stirring device on each of the above-mentioned rotating shafts so as to be eccentric in the same direction around the axis of each rotating shaft, and each of the stirring plates is connected to the inner wall of the container. A stirring device characterized in that a plate and a stirring plate are disposed close to each other with a slight gap left.