JP7030340B2 - Paddle for container rotary mixer - Google Patents

Description

Patent Law Article 30, Paragraph 2 Applicable Chemical Engineering Papers, Vol. 44, No. 5, pp. 292-297, Chemical Engineering Society, Publication date: September 20, 2018

The present invention relates to a paddle for an apparatus that rotates a container to mix objects to be mixed in the container.

Conventionally, such a paddle for a container rotary mixing device is made of metal, and as shown in FIG. 7, a container integrally formed with an arm portion b arranged outside the container a and the tip of the arm portion b. It has a paddle portion c arranged in a, and the paddle portion c has a horizontal portion d, vertical portions e and e'protruding upward from both ends of the horizontal portion d, and a center of the horizontal portion d. It has a connecting shaft portion f to the arm portion b protruding upward, and rubber wipers g, h, h'are provided on the lower surface of the horizontal portion d and the outer surfaces of the vertical portions e, e', and the mixing device m. The paddle portion c is housed in the container a installed on the turntable t, and the container a is rotated by the turntable t so that the paddle portion c can knead the mixing object w in the container a. It can be seen (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-204980

However, in the above-mentioned mountain-shaped paddle of the prior art, when the mixed object w is a highly viscous fluid, the ring-shaped region s inward and above the upper ends of the vertical portions e and e'(shown by cross-hatching in FIG. 7). Since it became clear that the non-fluid region did not flow, there was a problem that had to be solved, such as the inability to uniformly knead the highly viscous fluid due to the generation of this non-fluid region.

In view of the problem that a highly viscous fluid cannot be uniformly kneaded with a mountain-shaped paddle based on the above-mentioned prior art, the present invention has an arm portion arranged outside the container and the container integrally formed at the tip of the arm portion. It has a paddle portion arranged inside, and the paddle portion is connected to a horizontal portion, a vertical portion protruding upward from both ends of the horizontal portion, and an arm portion protruding upward from the center of the horizontal portion. A mixed object in a region corresponding to a non-fluid region by having a shaft portion, providing an inwardly protruding portion at the upper end of at least one of the vertical portions, and forming a convex curved surface on the lower surface of the horizontal portion . Can be mixed at the inwardly protruding portion to solve the above problem.

In short, the present invention has an arm portion arranged outside the container and a paddle portion integrally formed at the tip of the arm portion and arranged inside the container, wherein the paddle portion has a horizontal portion and the horizontal portion. It has a vertical portion protruding upward from both ends of the horizontal portion and a connecting shaft portion to the arm portion protruding upward from the center of the horizontal portion, and an inward protruding portion at the upper end of at least one of the vertical portions. Since the mixing target in the region corresponding to the non-fluid region can be mixed with the mixing target in the other region by the inwardly protruding portion, the mixing target in the container should be uniformly mixed. Can be done.
Since one of the vertical portions is raised and the inwardly protruding portion is provided on the other of the vertical portions, the object to be mixed above the other vertical portion can be mixed in one of the vertical portions, so that the inside of the container can be mixed. The objects to be mixed can be mixed more uniformly.

Since the lower surface of the horizontal portion is a convex curved surface, the area of the corner portion of the lower portion of the horizontal portion is wide and downward, so that the region of the lower portion of the container in the object to be mixed can be fluidized, so that the mixing performance can be improved. Can be improved.

Since the connecting shaft portion is a columnar body having a wide width and double-edged edge portions formed on both sides, the mixed object flowing in the container is split at one edge portion of the connecting shaft portion and connected. Since it flows along the front and back surfaces of the shaft portion and merges through the other edge portion, no groove is generated at the confluence portion of the mixed object downstream from the other edge portion, so that air bubbles are mixed into the mixed object. It can be prevented.

Since the arm part and the paddle part are integrally molded with plastic, the weight can be reduced, and the inner surface of the container is damaged as it is without providing a rubber wiper on the lower surface of the horizontal portion and the outer surface of the vertical portion. The practical effect is enormous, such as being able to prevent it from being given .

It is a front view of the paddle for a container rotary mixer which concerns on this invention. It is an enlarged view of the XX cross section of FIG. It is an enlarged view of the YY cross section of FIG. It is a top view of the container rotary mixing apparatus to which the paddle of FIG. 1 is attached. It is a partial cross-sectional front view of the container rotary mixing apparatus of FIG. It is a horizontal sectional view in the state of use of the container in which a paddle is housed. It is a partial sectional front view of the conventional container rotary mixing apparatus.

The paddle for a container rotary mixing device according to the present invention has an arm portion 1 arranged outside the container A and a paddle portion 2 integrally formed at the tip of the arm portion 1 and arranged inside the container A. The paddle portion 2 includes a horizontal portion 3, vertical portions 4 and 5 projecting upward from both ends of the horizontal portion 3, and a connecting shaft portion 6 to the arm portion 1 projecting upward from the center of the horizontal portion 3. And an inward protruding portion 7 is provided at the upper end of at least one of the vertical portions 4 and 5.

Specifically, the paddle for the container rotary mixer is an integrally molded product made of plastic, preferably made of fiber reinforced plastic to which fibers such as glass fiber are added, and as shown in FIGS. 1 to 3, the arm portion. It is composed of 1 and a paddle portion 2, and an inwardly projecting portion 7 is formed in the other vertical portion 5.

The arm portion 1 has a substantially inverted L-shape in which a horizontal portion 9 is projected from the upper end of the strut portion 8, and a portion below the strut portion 8 is a round bar-shaped insertion portion 10.

The paddle portion 2 is a columnar body in which one vertical portion 4 is made higher than the other vertical portion 5, the connecting shaft portion 6 is wide, and double-edged edge portions 11 and 11a are formed on both side portions. Is a columnar body having a flat hexagonal horizontal cross-sectional shape, and the R surface is chamfered at four corners other than the edges 11 and 11a.
Further, the lower surface of the horizontal portion 3 and the outer surfaces of the vertical portions 4 and 5 are convex curved surfaces 12, 13 and 14, and a double-edged edge portion is formed on the upper surface of the horizontal portion 3 and the inner surface of the vertical portions 4 and 5. Specifically, the cross-sectional shape is a teardrop shape.

In the drawing, the thickness of the other vertical portion 5 side of the horizontal portion 3 is thinner than that of the one vertical portion 4 side, but the thickness may be the same.

Then, as shown in FIGS. 4 and 5, the insertion portion 10 of the arm portion 1 is inserted into the insertion hole H in the mixing device M, and the paddle portion 2 is housed in the container A installed on the turntable T to turn. By rotating the container A with the table T, as shown in FIG. 6, the paddle portion 2 is pushed by the mixing object W and moves until the paddle portion 2 hits the container A, and the mixing object W is mixed in this state to mix the paddle portion. The mixing object W (for example, a sealing material) which is a highly viscous fluid in the container A is mixed by 2, but the non-fluid region of the mixing object W disappears due to the inward protrusion 7, and the mixing object W becomes uniform. Is mixed with.

Further, by making the paddle for the container rotary mixing device according to the present invention made of plastic, even if the paddle portion 2 hits the container A, the container A is not damaged, and the lower surface of the horizontal portion 3, the vertical portion 4, and the like. By making the outer surface of 5 a convex curved surface 12, 13, 14, the frictional resistance with respect to the inner surface of the container A is reduced.

Experiment 1
A conventional paddle with a rectangular plate shape for the connecting shaft, which has a scraping effect, is used, and a 4 wt% CVP aqueous solution is used as the model liquid for the plastic fluid as the object to be mixed. As a result of visualizing the mixing process by the decolorization method with the rotation speed set to 45 rpm and the forward / reverse rotation interval set to 30 s, it was clarified that a non-fluid region was formed in the center of the container or near the bottom of the container.

Experiment 2
A mixed visualization experiment was conducted to confirm the performance of the prototype 1 of the paddle according to the present invention.
The diameter of the container A is 120 mm, the blade diameter of the prototype 1 is 115 mm, the height of one vertical portion 4 is 85 mm, the height of the other vertical portion 5 is 60 mm, and the lower surface of the horizontal portion 3 is on the bottom of the container. It was installed so that it was almost in contact.
As the object to be mixed, starch paste having a higher yield value than the CVP aqueous solution was used, the rotation speed of the container was set to 45 rpm, the interval of forward and reverse rotation was set to 30 s by the container rotary mixing device, and the visualization and mixing time of the mixing process of the prototype were used. Was observed and measured by the decolorization method.

Although it is a qualitative observation, the decolorization is almost completed in about 600 s, and a thin film that has not been decolorized is observed on the upper part of the wall of the container A, because the height of the other vertical portion 5 is low. It is probable that the scraping effect was slightly weaker than that of the conventional paddle.
However, since it took about 900 s to mix with the conventional paddle, it is considered that the mixing performance was improved even if the height of the other vertical portion 5 was low.
In addition, since the portion of the prototype exposed to the liquid surface can be reduced, it is considered that air bubbles can be prevented from being mixed.

Experiment 3
An experiment was carried out using the actual liquid of the prototype 2 of the paddle according to the present invention.
The diameter of the container A is 210 mm, the prototype 2 is made of GFRP to prevent damage, the wing diameter is 205 mm so as to be in contact with the wall of the container A when the paddle bends, and the height of one vertical portion 4 is set. The height of the other vertical portion 5 was set to 150 mm, and the lower surface of the horizontal portion 3 was installed so as to be substantially in contact with the bottom of the container A.
The mixed object W uses a polyurethane-based sealing material (Yokohama Rubber Co., Ltd., trade name: Hamatite SC-PU2NB) with a large yield value used at construction sites, and is a curing agent with respect to the main agent (white) 10 by weight. The two liquids are mixed at a ratio of (transparent) 1 to make the total volume 6 L, the rotation speed of the container is set to 45 rpm, the interval of forward / reverse rotation is set to 30 s, and the mixing process is visually observed by the container rotary mixing device. Therefore, a black tracer was added to the liquid free surface to measure the mixing time.

Although it was a qualitative observation, it was judged that the mixing of the polyurethane-based sealant was completed in about 300 s.
The white main agent and the transparent curing agent were uniformly mixed and cured after 1 day (not cured if the mixing was not sufficient).
Further, when the mixing object W having a high apparent viscosity is mixed using a container rotary mixing device having a forward / reverse inversion mechanism, even if the shaft is installed at the center, stress is received from the mixing object W and the paddle is released. Was observed.
It is considered that this effect added the effect of eccentric stirring (see FIG. 6), and the flow in the container A became a more unsteady flow, so that the mixing was promoted.
In order to improve the quality of the sealing material, it is required to prevent air bubbles from entering. When observing the cross section of the cured sealing material cut vertically together with the can, the cross section of the conventional paddle is compared with that of the prototype 2. It is considered that the cross section of the above has very little air bubbles mixed in, and the air bubbles are sufficiently prevented from being mixed.

Therefore, the optimum conditions for the paddle according to the present invention for eliminating the non-fluid region observed with the conventional paddle are the following (1) to (6).
(1) The connecting shaft portion 6 is a plate type.
(2) In order to eliminate the non-fluid region in the center of the container, an inwardly protruding portion 7 is formed at the position where the donut ring of the other vertical portion 5 is generated, so that the shape is asymmetrical to the right.
(3) In order to further increase the scraping effect, the vertical width of the horizontal portion 3, the vertical portions 4, 5 and the horizontal width of the connecting shaft portion 6 are widened, and the edge portions 11 and 11a are provided on both side surfaces of the connecting shaft portion 6. Edge portions are formed on the inner surface of the horizontal portion 3 and the vertical portions 4 and 5.
(4) In order to eliminate the non-fluid region in the lower part of the container A, the outer surfaces of the horizontal part 3 and the vertical parts 4 and 5 are made convex curved surfaces 12, 13 and 14, and the area of the corner part in the lower part of the horizontal part 3 is widened.
(5) Since the unsteady operation is effective for the mixing operation, a container rotary mixing device having a forward / reverse reversing mechanism is adopted every 30s.
(6) In order to minimize the mixing of air bubbles in order to improve the product quality of the mixed object W after mixing, the height of the other vertical portion 5 is set so that the tip is lower than the liquid level. Set.

1 Arm part 2 Paddle part 3 Horizontal part 4, 5 Vertical part 6 Connecting shaft part 7 Inward protrusion
11, 11a Edge
12 Convex curved surface A container

Claims (4)

A paddle for a container rotary mixer that rotates a container placed on a turntable to mix the objects to be mixed in the container.
It has an arm portion arranged outside the container and a paddle portion integrally formed at the tip of the arm portion and arranged inside the container, and the paddle portion has a horizontal portion and both ends of the horizontal portion. It has a vertical portion protruding upward and a connecting shaft portion to the arm portion protruding upward from the center of the horizontal portion, and an inward protruding portion is provided at the upper end of at least one of the vertical portions, and the horizontal portion is provided. A paddle for a container rotary mixer characterized by having a convex curved surface on the lower surface of the part . The paddle for a container rotary mixing device according to claim 1, wherein one of the vertical portions is raised and the inwardly protruding portion is provided on the other of the vertical portions. The paddle for a container rotary mixing device according to claim 1 or 2, wherein the connecting shaft portion is a columnar body having a wide width and double-edged edge portions formed on both side portions. The paddle for a container rotary mixing device according to claim 1, 2 or 3, wherein the arm portion and the paddle portion are integrally molded with plastic.

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