JPH0559781B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a stirring and mixing device suitable for use in fluidizing various solids.

"Prior art and its problems" When changing the state of solids such as various powders to a fluid by stirring and mixing them with a liquid medium, a fluidizing agent, etc., multiple mixers are generally used to mix the phase change materials with each other. Although a drop in mixing efficiency is prevented by stirring and mixing while preventing mixing, equipment costs and power costs increase, and it is also disadvantageous in terms of operation. In addition, forced mixing may be carried out using a kneader or the like, but in this case, although the apparatus can be made more compact, it has the drawbacks of increased power consumption and equipment costs, and moreover, increased wear on the apparatus.

The present invention was made in view of the above circumstances, and
By directly mixing each state of each phase while preventing mutual mixing of phase change substances, we provide a stirring and mixing device that increases mixing efficiency, simplifies the stirring and mixing process, and reduces equipment and power costs. The purpose is to

"Means for Solving the Problems" In order to achieve the above object, the present invention provides a stirring and mixing device that stirs and mixes solid materials to gradually change their state into a fluid, which includes an input port and a discharge port. At least a pair of rotating shafts extending in the longitudinal direction of the container are provided substantially parallel to each other inside a container having a predetermined length toward the discharge port and installed substantially horizontally, and the rotating shafts are provided with the above-mentioned A stirring blade is provided for stirring and mixing the material while feeding it from the input port toward the discharge port at a speed on the discharge port side that is faster than the feed speed on the input port side. The interior of the container is divided into a plurality of zones along the delivery direction, and a buffer is provided to form a stirring and mixing area according to the change in the state of the material, and the material is stirred and mixed at the discharge port to change its state to a fluid. An adjustment means is provided to adjust the amount of the above-mentioned material retained.

"Operation" In the above configuration, the solid material introduced into the container from the input port is stirred and mixed by the stirring blades installed on the rotating shaft, gradually changing its state into a fluid, and then being discharged from the discharge port. However, the inside of the container is divided into multiple stirring and mixing zones by baffles along the material delivery direction, and furthermore, the material feeding speed by the stirring blade increases on the discharge port side, so the material Even when fluidization progresses, the fluid does not flow backwards, the stirring and mixing zones are easy to distinguish, and substances in different phases are not mixed with each other, so that the stirring force acts uniformly on the material. , improve stirring efficiency. In addition, when the retention amount is adjusted by the adjustment means, the effect of increasing the feed rate by the stirring blade and the effect of maintaining the liquid level of the fluid by the buffer are combined, and the liquid level becomes higher in the mixing region where the viscosity decreases as stirring and mixing progresses. Therefore, the stirring torque in each mixing zone becomes approximately constant as a whole, and the stirring efficiency is further improved.

"Example" An example of the stirring and mixing apparatus of the present invention will be described with reference to FIGS. 1 to 3.

In the figure, reference numeral 1 indicates a cylindrical container installed almost horizontally.
An input port 2 for charging the solid material M is provided inside the 1b, and a discharge port 3 for discharging the fluid R obtained by changing the phase of the solid material M to the outside is provided at the lower part of the 1b. Inside the container 1, a pair of left and right first rotation shafts 4a, 4b extending in the longitudinal direction are provided passing through the end faces of both ends 1a, 1b of the container 1, and the first rotation shafts 4a, 4b Both ends of the container 1 projecting to the outside are rotatably supported by bearings 5, 5. And the first rotating shafts 4a, 4b
The first rotating shafts 4a, 4b are attached to the protruding ends of the third rotating shaft.
A drive device that rotates the right first rotating shaft 4b in the clockwise direction and the left first rotating shaft 4a in the counterclockwise direction (this is referred to as the outward direction) at high speed in the cross-sectional view of the figure. (not shown) is provided. Further, on the rear end 1a side of the container 1, a pair of second rotating shafts 6a, 6b are fitted onto the rear end side portions of the first rotating shafts 4a, 4b so as to be relatively rotatable.
It is rotatably supported by a bearing 7 and extends outward through the end surface of the rear end 1a of the container 1, and the second rotating shafts 6a, 6b are provided at the protruding portions of the second rotating shafts 6a, 6b. A drive device (not shown) is provided that rotates the rotation shaft 6b at a low speed in a direction opposite to the first rotation shafts 4a, 4b (this is called an inward direction). The portions of the second rotating shafts 6a, 6b located inside the container 1 are located at the base end portions m, m that face the lower part of the input port 2, and the front portions having approximately the same length as the base end portions m, m. It consists of front end portions n, n nearer to each other, and the proximal end portions m, m
Spiral blades 8a, 8a are fixed to the outer periphery of the front end portions n, and a plurality of paddle-shaped stirring blades 9 are attached at predetermined pitches in the axial direction to the outer periphery of the front end portions n, n. The spiral blades 8a, 8a are connected to the second rotating shaft 6.
The positions of a and 6b are shifted from each other by half a pitch in the axial direction, and the adjacent portions of the rotating shafts overlap each other when viewed in the axial direction of the rotating shaft. The paddle-shaped stirring blades 9... are connected to the second rotating shaft 6a,
A paddle plate 9b is attached to the tip of the arm portion 9a implanted in 6b.
is fixed at a predetermined slope in the axial direction with respect to a surface extending in the radial and axial directions of the rotating shaft, and the same position in the axial direction of the rotating shaft is spaced at intervals of 180 degrees in the circumferential direction. There are two sets. Here, although the stirring blades 9 of one second rotating shaft 6a and the stirring blades 9 of the other second rotating shaft 6b have the same mounting pitch in the axial direction, the axes of the rotating shafts 6a and 6b as a whole Furthermore, the loci of the tips of the same blades overlap, and the mounting positions of the rotation shafts 6a and 6b in the circumferential direction are shifted by 45 degrees from each other. Further, on the outer periphery of the portion of the first rotating shafts 4a, 4b located inside the container 1 and not fitted with the second rotating shaft, there is provided an arm portion 10a and a paddle plate 10b, similar to the stirring blade 9. A plurality of paddle-shaped stirring blades 10 are mounted at a predetermined mounting pitch in the axial direction of the rotating shafts 4a and 4b, and each paddle plate 10b
is inclined at a predetermined gradient in the axial direction with respect to a surface extending in the radial and axial directions of the rotating shaft. Two sets of these stirring blades 10 are also provided at the same position in the axial direction of the rotating shaft at intervals of 180 degrees in the circumferential direction, one stirring blade 10 for the first rotating shaft 4a and the other stirring blade 10 for the first rotating shaft 4b. Although the mounting pitches of the stirring blades 10 in the axial direction are the same, they are shifted by half a pitch in the axial direction as a whole, and the trajectories of the tips of the same blades overlap, and the rotating shaft 4
The mounting positions of a and 4b in the circumferential direction are shifted by 45 degrees from each other as shown in FIG.

Furthermore, inside the container 1, there are a plurality of buttholes that divide the inside of the container 1 into a plurality of zones (four zones in the figure) in the longitudinal direction to form a plurality of stirring and mixing zones corresponding to changes in the state of the material. is provided. That is, inside the container 1, there is a rotating shaft 4.
The first, second, and third fixing plates 11a, 11b, and 11c each having a through hole through which the fixing plates a and 4b are inserted are fixed at both left and right edges to the left and right inner surfaces of the container 1 in the longitudinal direction of the container 1. with a predetermined interval between them, and container 1.
are provided across the container 1 at a predetermined interval in the lower part of the interior of the container 1. Also, on the left and right inner surfaces of the container 1, a pair of left and right frame members 12a, 12b, 12c are provided.
is fixed to the rear (left side in FIG. 1) from each fixed plate 11a, 11b, 11c with a predetermined gap,
A rectangular first, second, and third full 13 with elongated holes extending vertically between the fixing plate and the frame member.
a, 13b, and 13c are inserted into the elongated holes so that the rotary shafts can be freely moved up and down, respectively. Each of the levers 13a, 13b, 13c has a pair of left and right levers 14a, 14b, which penetrate upward through the upper surface of the container 1.
14c is fixed with its axis directed in the vertical direction. And each lever 14a, 14b, 14c
By manually or mechanically raising and lowering the
The vertical position of each baffle 13a, 13b, 13c is adjusted so that the distance between the bottom of the container 1 and each buffle can be adjusted. Further, a fixed baffle 15 is provided inside the container 1 at a portion adjacent to the discharge port 3 so as to cross the inside of the container 1 and have an opening in the lower part. The area from the input port 2 of the container 1 to the first buffer 13a is a high viscosity mixing area A, and the area between the first buffer 13a and the second buffer 13b is a medium viscosity mixing area B.
The area between the second buffer 13b and the third buffer 13c is a low viscosity mixing area C, and the third buffer 1
The area between 3c and the fixed baffle 15 is divided into a defoaming mixing area D.

Stirring blades 9 in the mixing zones A, B, C...,
The mounting slope of 10... is smaller in the medium viscosity mixing area B than in the high viscosity mixing area A, and smaller in the low viscosity mixing area C than in the medium viscosity mixing area B, and this As a result, the pressure-receiving area of the stirring blade increases, and as a result, the material feeding speed gradually increases as it approaches the discharge port 3. Further, in the defoaming mixing area D, in this example, the stirring blade 10 is not provided with an attachment slope, and the material is hardly fed at a speed. In addition to adjusting the slope of the stirring blades 9, 10 in this way, the paddle plates 9 of the stirring blades 9, 10
By gradually increasing the area of the blades b and 10b as they approach the discharge port 3, the feed speed of the material can be gradually increased, and the number of blades can also be increased by shortening the gap distance between the coaxial blades. By increasing the pitch, the mounting pitch of the stirring blades 9, 10 can be gradually reduced as they approach the discharge port 3, thereby increasing the feeding speed. Further, the mounting slope, mounting pitch, and blade area of the stirring blades 9 and 10 in the mixing zones A, B, and C may be adjusted so as to gradually change over the entire axial direction of the rotating shaft, or each It may be adjusted so that it changes for each mixing region.

Further, a pair of left and right frame members 16 are fixed to the left and right inner surfaces of the container 1 from the fixed buttful 15 forward (on the right side in FIG. 1) with a predetermined gap,
A rectangular adjustment plate 17 having a vertically extending elongated hole is inserted between the fixed buttful 15 and the frame member 16 so that it can freely move up and down, with a rotating shaft inserted into the elongated hole.
A pair of left and right levers 18 passing upward through the upper surface of the container 1 are fixed to the adjustment plate 17 with their axes directed in the vertical direction. Then, by manually or mechanically moving the lever 18 up and down, the adjustment plate 1
The vertical position of the container 7 can be adjusted so that the distance between the bottom surface of the container 1 and the adjustment plate 17 can be adjusted, and the adjustment plate 17 and the lever 18 constitute adjustment means for adjusting the amount of fluid retained. are doing. Further, a discharge valve (not shown) is connected to the discharge port 3, and the amount of fluid R retained can also be adjusted by adjusting the opening degree of the discharge valve.

Furthermore, the other end of a suction pipe 19 whose one end is connected to a vacuum generator (not shown) is connected to the center of the upper surface of the defoaming mixing area D of the container 1, and air bubbles are removed through the suction pipe 19. It is about to be removed.

The stirring blade 9 may have the same basic structure as the stirring blade 10 as described above, but it may have a structure in which the edges of the paddle plate are made larger to scrape up the solid material to ensure more reliable stirring. You can also use it as Further, each baffle may be divided into two or more parts, for example, into an upper part and a lower part of the rotating shaft, so that the position of each part can be adjusted independently. Also,
In the figure, 20 is a sealing device for forming a seal between each rotating shaft and the container 1, and 21 is a sealing device for forming a seal between the first rotating shaft and the second rotating shaft.
This is a sealing device for creating a seal between the rotary shaft and the rotary shaft. Furthermore, the center of the bottom of the container 1 is made to protrude upward in accordance with the rotation range of the stirring blade, so that there is no non-stirring area.

In the above-mentioned stirring and mixing device, the solid material M introduced into the container 1 from the input port 2 is transported in the high viscosity mixing region A by the spiral blades provided on the second rotating shafts 6a and 6b which are rotated at low speed. 8a, 8a forcibly pushed forward, and stirred and mixed by paddle-shaped stirring blades 9 attached to the same rotating shaft. And the 1st, 2nd, 3rd full 1
3a, 13b, and 13c in sequence, high viscosity mixing area A → medium viscosity mixing area B → low viscosity mixing area C →
The mixture is sequentially transferred to the defoaming mixing area D and discharged to the outside from the discharge port 3, but during this time, it is further stirred and mixed by the stirring blades 10, fluidized, and discharged as a fluid R having a predetermined viscosity.

When a mixture of solid and liquefied materials is mixed, it is difficult to apply stirring force directly to the solid particles, but in the above-mentioned stirring and mixing device, stirring and mixing zones are differentiated according to changes in the state of the materials. Therefore, substances in different phases are not mixed with each other, and therefore, the stirring force acts uniformly on the material, improving stirring efficiency. Further, in the above device, the amount of fluid R retained is adjusted by narrowing the opening of the discharge valve or adjusting the vertical position of the adjustment plate 17 with the lever 18, and
The mounting slope of the stirring blades 9..., 10... is smaller in the medium viscosity mixing region B than in the high viscosity mixing region A, and smaller in the low viscosity mixing region C than in the medium viscosity mixing region B. As a result, the feed rate of the material increases as it approaches the discharge port 3. Therefore, as the agitation mixture progresses and the viscosity decreases in the front mixing zone, the retention amount increases and the liquid level becomes higher, and overall, while the agitation torque in each mixing zone is approximately constant, the agitation efficiency is improved. is gradually increasing. In addition, since the feed rate gradually increases as described above, even if fluidization progresses, the fluid does not flow backwards, which promotes the partitioning effect of the buffle and contributes to improving the stirring efficiency.

Furthermore, in the above-mentioned stirring and mixing device, air bubbles are removed through the suction pipe 19 in the defoaming mixing zone D, but in the mixing zone D, the stirring blades 10 are rotated at high speed in the outer direction to extend the liquid level. As a result, the internal bubbles are stretched out on the surface and disappear, resulting in effective defoaming. In addition, each batch is structured so that its vertical position can be freely adjusted, making it easy to optimally adjust the retention amount (liquid level) in each mixing zone and adjust the mixing degree. Optimal operating conditions can be obtained even if the materials and properties are different.

By the way, in the above example, the defoaming step is
This may not be necessary depending on the material to be fluidized. In this case, both the first rotation axis and the second rotation axis may be inward. Furthermore, if fluidization is relatively easy and the high viscosity mixing region is relatively short, both shafts can be rotated at similar speeds.
Further, in the above embodiment, the process may be divided into two steps, a high viscosity mixing step and a remaining mixing step, and the apparatus may be constructed in two stages corresponding to the two steps. Furthermore,
The shape of the paddle plate of the stirring blade does not have to be rectangular, it may be curved, and the direction of inclination thereof may be in a plurality of directions, such as two directions. Furthermore, the entire container may be installed so that the front discharge port side is lower than the input port side. In this way, stable discharge of the fluid and prevention of backflow can be achieved more reliably.

"Effects of the Invention" As explained above, in the stirring and mixing device of the present invention, the solid material introduced into the container from the input port is divided into sections, stirred and mixed, and gradually changed into a fluid state, and the solid material is gradually changed to a fluid state, and then the solid material is poured into the container from the input port. Since the materials in different phases are not mixed with each other, the mixing process is simplified and connected, and the stirring force acts uniformly on the material, improving stirring efficiency. Therefore, equipment costs and power costs can be significantly reduced compared to conventional methods. Furthermore, the feeding speed of the material by the stirring blade increases on the discharge port side, so even if the fluidization of the material progresses, the fluid will not flow backwards, making it easier to distinguish the stirring and mixing area. With the addition of the adjusting means and the liquid level holding effect of the fluid by the buffer, stirring and mixing progresses, and the liquid level becomes higher in the mixing area where the viscosity is lower, so the stirring torque in each mixing area remains almost constant as a whole. This has the effect of further increasing the stirring efficiency.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a horizontal sectional view thereof, and FIG. 3 is a sectional view taken along the - arrow in FIG. 1... Container, 2... Inlet, 3... Outlet, 4
a, 4b...first rotating shaft (high speed rotating shaft part), 6a,
6b... Second rotating shaft (low speed rotating shaft part), 8... Spiral blade, 9, 10... Stirring blade, 13a, 13
b, 13c...1st, 2nd, 3rd full, 17
...adjustment board.

Claims (1)

[Scope of Claims] 1. A stirring and mixing device that stirs and mixes solid materials to gradually change their state into a fluid, which includes an input port and a discharge port, has a predetermined length from the input port to the discharge port, and has approximately Inside a container placed horizontally,
At least a pair of rotating shafts extending in the longitudinal direction of the container are provided substantially parallel to each other, and the rotating shafts are configured to feed the material at a speed at which the feed speed on the discharge port side is faster than the feed speed on the input port side. While a stirring blade is provided for stirring and mixing the materials while feeding them from the input port toward the discharge port, the inside of the container is divided into a plurality of areas along the feeding direction of the materials. A buffer is provided to form an agitation/mixing zone according to a change in state, and the discharge port is provided with an adjusting means for adjusting the amount of the material that has been agitated and mixed and whose state has changed into a fluid. Stirring and mixing equipment. 2. The rotating shaft includes a low-speed rotating shaft part located on the inlet side of the container and rotated inwardly at low speed, and a high-speed rotating shaft part located on the outlet side of the container and rotating outwardly at high speed. The stirring blade includes a spiral blade provided on the low-speed rotating shaft,
A plurality of paddle-shaped stirring blades are provided at predetermined mounting pitches in the longitudinal direction of the low-speed rotating shaft at a portion where the spiral blades are not provided, and a plurality of paddle-shaped stirring blades are mounted at predetermined mounting pitches in the longitudinal direction of the high-speed rotating shaft. 2. The stirring and mixing device according to claim 1, comprising a plurality of paddle-shaped stirring blades arranged in pitch. 3. The rotating shaft includes a low-speed rotating shaft portion located on the inlet side of the container and rotated inwardly at low speed, and a high-speed rotating shaft portion located on the outlet side of the container and rotating inwardly at high speed. The stirring blade includes a spiral blade provided on the low-speed rotating shaft,
A plurality of paddle-shaped stirring blades are provided at predetermined mounting pitches in the longitudinal direction of the low-speed rotating shaft at a portion where the spiral blades are not provided, and a plurality of paddle-shaped stirring blades are mounted at predetermined mounting pitches in the longitudinal direction of the high-speed rotating shaft. 2. The stirring and mixing device according to claim 1, comprising a plurality of paddle-shaped stirring blades arranged in pitch. 4. The plurality of paddle-shaped stirring blades are inclined at a predetermined slope with respect to the axis of the rotating shaft, and the slope is set to become smaller as it approaches the outlet of the container. A stirring and mixing device according to claim 2 or 3. 5. The stirring and mixing device according to claim 2 or 3, wherein the mounting pitches of the plurality of paddle-shaped stirring blades are set to become smaller as they approach the outlet of the container. 6. The stirring and mixing device according to claim 2 or 3, wherein the area of the plurality of paddle-shaped stirring blades increases as it approaches the outlet of the container.