JP7604852B2 - Mixing and drying equipment - Google Patents

Description

This disclosure relates to a mixing device and a drying device.

Ribbon mixers are widely used as mixing devices for mixing materials such as liquids, powders, or slurries (for example, Patent Document 1). Ribbon mixers include a container, a rotating shaft, multiple arms, and a mixing blade (ribbon). The container is cylindrical and contains the material to be processed. The rotating shaft is provided inside the container. The arms are cylindrical and connect the rotating shaft and the mixing blade. The mixing blade is a helical member that is curved in the direction of rotation of the rotating shaft. The ribbon mixer mixes the material to be processed by causing it to flow with the mixing blade that rotates along with the rotating shaft.

JP 2000-74565 A

There is a need to develop technology to improve the mixing efficiency of conventional ribbon mixers such as those described in Patent Document 1 above.

In view of these issues, the present disclosure aims to provide a mixing device and a drying device that can improve mixing efficiency.

In order to solve the above problems, an agitation device according to one aspect of the present disclosure includes a container having a cylindrical outer cylinder and a mirror plate sealing at least one axial end of the outer cylinder, and for accommodating a material to be treated; a rotating shaft rotatably provided within the container; a plurality of arms standing upright from the rotating shaft and spaced apart in the circumferential direction and in the extension direction of the rotating shaft; and agitation blades attached to the ends of the plurality of arms and curved in the rotation direction of the rotating shaft , wherein the agitation blades move the material to be treated toward approximately the center in the extension direction of the rotating shaft by rotation of the rotating shaft, and the plurality of arms include a first blade having at least a portion of a polygonal cross section. The rotary kiln includes one arm, a second arm that is provided near the mirror plate and is not shaped to press the workpiece against the mirror plate in response to rotation of the rotating shaft, and a third arm that is provided approximately in the center of the extension direction of the rotating shaft and has at least a portion of a cross section that is circular, the first arm being provided between the second arm and the third arm in the extension direction of the rotating shaft, the second arm having a first surface that is approximately parallel to the mirror plate and a second surface that is provided closer to the third arm than the first surface and is inclined relative to the first surface, and the second surface of the second arm is inclined in a direction away from the first surface as it moves from the front in the rotation direction of the rotating shaft to the rear in the rotation direction .

The cross section of the first arm may also be rectangular with a surface that is approximately parallel to the stirring blade.

The container may also be equipped with a heating section for heating the object to be treated contained therein.

In order to solve the above problems, a drying device according to one aspect of the present disclosure includes a container having a cylindrical outer cylinder and an end plate sealing at least one axial end of the outer cylinder, and for accommodating an object to be treated, a rotating shaft rotatably provided within the container, a plurality of arms standing upright from the rotating shaft and spaced apart in the circumferential direction and in the extension direction of the rotating shaft, stirring blades attached to the tips of the plurality of arms and curved in the rotation direction of the rotating shaft, and a heating unit for heating the object to be treated accommodated in the container , wherein the stirring blades move the object to be treated toward approximately the center in the extension direction of the rotating shaft by rotation of the rotating shaft,
The multiple arms include a first arm, at least a portion of which has a polygonal cross-section, a second arm, which is provided near the mirror plate and is not shaped to press the workpiece against the mirror plate in response to rotation of the rotating shaft, and a third arm, which is provided approximately in the center of the extension direction of the rotating shaft and has at least a portion of which has a circular cross-section, the first arm being provided between the second arm and the third arm in the extension direction of the rotating shaft, the second arm having a first surface approximately parallel to the mirror plate and a second surface which is provided closer to the third arm than the first surface and is inclined relative to the first surface, and the second surface of the second arm is inclined in a direction away from the first surface as it moves from the front in the rotation direction of the rotating shaft to the rear in the rotation direction .

This disclosure makes it possible to improve mixing efficiency.

FIG. 1 is a diagram illustrating a drying device according to an embodiment. FIG. 2 is a first diagram for explaining the flow direction of the material to be treated caused by the stirring blade. FIG. 3 is a second diagram for explaining the flow direction of the material to be treated caused by the stirring blade. FIG. 4 is a diagram illustrating an arm according to the embodiment. FIG. 5 is a diagram illustrating the flow velocity distribution. FIG. 6 is a diagram illustrating the relationship between the ratio of the region in the container where the mixing rate of the fluid is equal to or greater than 40% and less than 60%, and the mixing time. FIG. 7 is a diagram for explaining the mixing ratio of polymers. FIG. 8 is a diagram illustrating the drying time.

The embodiments of the present disclosure will be described in detail below with reference to the attached drawings. The dimensions, materials, and other specific values shown in the embodiments are merely examples for ease of understanding, and do not limit the present disclosure unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are given the same reference numerals to avoid duplicated explanations, and elements not directly related to the present disclosure are not illustrated.

Figure 1 is a diagram illustrating a drying device 100 according to this embodiment. In Figure 1, the dashed arrow indicates the direction of rotation of the rotating shaft 120. In Figure 1 and the following figures of this embodiment, the X-axis (horizontal direction), Y-axis (horizontal direction), and Z-axis (vertical direction) that intersect perpendicularly are defined as shown.

The drying device 100 dries the object to be treated. The object to be treated is, for example, sludge generated in sewage treatment, food waste, etc. As shown in FIG. 1, the drying device 100 (mixing device) includes a container 110, a rotating shaft 120, multiple arms 130, an agitating blade 140, and a heating unit 170.

The container 110 contains the object to be treated. The container 110 includes an outer cylinder 112 and a mirror plate 114. The outer cylinder 112 is a cylindrical hollow member. The mirror plate 114 seals the openings formed at both ends of the outer cylinder 112. In this embodiment, the container 110 is installed so that its axial direction is horizontal (±X-axis direction in FIG. 1).

The outer cylinder 112 is connected to a supply pipe 112a and a discharge pipe 112b. The supply pipe 112a is connected to the approximate center of the upper part of the outer cylinder 112. The workpiece before drying is guided into the container 110 through the supply pipe 112a. An opening/closing valve 116a is provided on the supply pipe 112a.

The discharge pipe 112b is connected to the approximate center of the lower part of the outer cylinder 112. The dried workpiece is discharged from the container 110 through the discharge pipe 112b. An opening/closing valve 116b is provided in the discharge pipe 112b.

The rotating shaft 120 is rotatably provided within the container 110. The rotating shaft 120 is provided within the container 110 so as to extend in the extension direction of the outer cylinder 112. In other words, the rotating shaft 120 extends horizontally (±X-axis direction in FIG. 1). In this embodiment, the rotating shaft 120 is provided within the container 110 so that the central axis of the rotating shaft 120 substantially coincides with the central axis of the outer cylinder 112. The rotating shaft 120 is rotated in the A direction or B direction in FIG. 1 by a motor (not shown).

The arm 130 stands upright from the rotating shaft 120. The arms 130 are provided on the rotating shaft 120 at regular intervals in the circumferential direction of the rotating shaft 120 and in the extension direction of the rotating shaft 120.

The agitator blades 140 are attached to the tips of multiple arms 130. The agitator blades 140 are spiral-shaped flat plates curved in the direction of rotation of the rotating shaft 120. The agitator blades 140 are provided at a distance from the rotating shaft 120 by the arms 130. The agitator blades 140 move the material to be treated toward approximately the center of the rotating shaft 120 as the rotating shaft 120 rotates. In this embodiment, the agitator blades 140 include a first blade unit 150 and a second blade unit 160.

The first blade unit 150 is provided from one end (left side in FIG. 1) of the rotating shaft 120 to approximately the center. In this embodiment, the first blade unit 150 includes a first outer blade 152 and a first inner blade 154. The first inner blade 154 is provided closer to the rotating shaft 120 than the first outer blade 152. The first inner blade 154 has a spiral winding direction opposite to that of the first outer blade 152.

The second blade unit 160 is provided from the other end (right side in FIG. 1) of the rotating shaft 120 to approximately the center. In this embodiment, the second blade unit 160 includes a second outer blade 162 and a second inner blade 164, similar to the first blade unit 150. The second outer blade 162 has a spiral winding direction opposite to that of the first outer blade 152. The second inner blade 164 is provided closer to the rotating shaft 120 than the second outer blade 162. The second inner blade 164 has a spiral winding direction opposite to that of the second outer blade 162. In other words, the first outer blade 152 and the second inner blade 164 have the same spiral winding direction. Furthermore, the first inner blade 154 and the second outer blade 162 have the same spiral winding direction.

The heating unit 170 heats the workpiece contained in the container 110. The heating unit 170 is, for example, an electric heater, a steam tracer, or the like. In this embodiment, the heating unit 170 heats the container 110 and the rotating shaft 120, thereby indirectly heating the workpiece. For ease of understanding, the heating unit 170 that heats the rotating shaft 120 is omitted from FIG. 1.

Next, the drying of the workpiece using the drying device 100 will be described. First, the on-off valve 116b is closed and the on-off valve 116a is opened. Then, the workpiece is supplied into the container 110 through the supply pipe 112a. When the supply of the workpiece is completed, the on-off valve 116a is closed. Next, the rotation of the rotating shaft 120 is started, and heating by the heating unit 170 is started.

Figures 2 and 3 are diagrams explaining the flow direction of the material to be treated by the stirring blade 140. As shown in Figure 2, when the rotating shaft 120 rotates in the A direction in Figure 2 (counterclockwise when viewed from the +X side in Figure 2), the first outer blade 152 of the first blade unit 150 moves the material to be treated in the -X axis direction (towards the left mirror plate 114) as shown by the white arrow in Figure 2. Also, the first inner blade 154 of the first blade unit 150 moves the material to be treated in the +X axis direction (approximately the center of the container 110) as shown by the black arrow in Figure 2.

On the other hand, the second outer blade 162 of the second blade unit 160 moves the workpiece in the +X-axis direction (towards the right mirror plate 114) as shown by the white arrow in Figure 2. The second inner blade 164 of the second blade unit 160 moves the workpiece in the -X-axis direction (approximately the center of the container 110) as shown by the black arrow in Figure 2.

As shown in FIG. 3, when the rotating shaft 120 rotates in the B direction (clockwise as viewed from the +X side in FIG. 3), the first outer blade 152 of the first blade unit 150 moves the workpiece in the +X axis direction (approximately the center of the container 110) as indicated by the white arrow in FIG. 3. The first inner blade 154 of the first blade unit 150 moves the workpiece in the -X axis direction (toward the left mirror plate 114) as indicated by the black arrow in FIG. 3.

On the other hand, the second outer blade 162 of the second blade unit 160 moves the workpiece in the -X-axis direction (approximately the center of the container 110) as shown by the white arrow in Figure 3. Also, the second inner blade 164 of the second blade unit 160 moves the workpiece in the +X-axis direction (towards the right mirror plate 114) as shown by the black arrow in Figure 3.

The motor (not shown) alternates the rotation direction of the rotating shaft 120 between direction A and direction B. This reverses the flow direction of the material to be treated by the agitating blade 140. Therefore, the agitating blade 140 can efficiently agitate the material to be treated.

This increases the frequency of contact between the container 110 heated by the heating unit 170 and the workpiece, and between the rotating shaft 120 heated by the heating unit 170 and the workpiece. This allows the drying device 100 to dry the workpiece. When the drying of the workpiece is completed, the on-off valve 116b is opened, the rotating direction of the rotating shaft 120 is set to direction B, and the workpiece is gathered in approximately the center of the container 110 and discharged to the outside through the discharge pipe 112b.

In the past, all the arms of the drying device were cylindrical. The stirring effect of the stirring blades is less effective on the side of the rotating shaft than the inner blades of the stirring blades. For this reason, if all the arms were cylindrical, the fluidity of the material to be treated would be low near the rotating shaft in the container, that is, at the base of the arms. Therefore, the drying device 100 of this embodiment is able to reduce the areas where the fluidity of the material to be treated is low by devising a shape for the arm 130. The shape of the arm 130 of this embodiment is described below.

Figure 4 is a diagram illustrating the arm 130 according to this embodiment. Figure 4A is a diagram illustrating the rotating shaft 120 and the arm 130. Figure 4B is a diagram illustrating the left end arm 134 in Figure 4A. Figure 4C is a diagram illustrating the stirring arm 136d.

As shown in FIG. 4A, the arm 130 includes a central arm 132, an end arm 134, and an agitator arm 136.

Four central arms 132 (third arms) are provided approximately in the center of the rotating shaft 120. The four central arms 132 are provided at approximately equal intervals in the circumferential direction of the rotating shaft 120. In other words, the angle between two adjacent central arms 132 is, for example, 90°. The central arms 132 have a circular cross section. In other words, the central arms 132 are cylindrical.

Two end arms 134 (second arms) are provided on each end of the rotating shaft 120 (four in total). In other words, the end arms 134 are provided near the mirror plate 114. The angle between the two end arms 134 provided on one end or the other end of the rotating shaft 120 is, for example, 90°.

The agitation arm 136 (third arm) is provided on the rotating shaft 120 between the central arm 132 and the end arm 134. The agitation arm 136 includes agitation arms 136a to 136d. Agitation arms 136a and 136b are provided between the end arm 134 on the left side in FIG. 4A and the central arm 132. Agitation arms 136c and 136d are provided between the end arm 134 on the right side in FIG. 4A and the central arm 132. Two of each of the agitation arms 136a, 136b, 136c, and 136d are provided on the rotating shaft 120 (a total of eight).

The angle between the two agitation arms 136a is, for example, 90°. Similarly, the angle between the two agitation arms 136b, the angle between the two agitation arms 136c, and the angle between the two agitation arms 136d are, for example, 90°.

In the extension direction of the rotation shaft 120, the distance between the end arm 134 and the agitator arm 136a, the distance between the agitator arm 136a and the agitator arm 136b, the distance between the agitator arm 136b and the central arm 132, the distance between the central arm 132 and the agitator arm 136d, the distance between the agitator arm 136d and the agitator arm 136c, and the distance between the agitator arm 136c and the end arm 134 are approximately equal.

The first outer blade 152 is connected to the end arm 134, the stirring arm 136a, the stirring arm 136b, and the central arm 132. The first inner blade 154 is connected to the end arm 134, the stirring arm 136a, the stirring arm 136b, and the central arm 132. Note that the end arm 134, the stirring arm 136a, the stirring arm 136b, and the central arm 132 connected to the first inner blade 154 are shorter than the end arm 134, the stirring arm 136a, the stirring arm 136b, and the central arm 132 connected to the first outer blade 152.

The second outer blade 162 is connected to the end arm 134, the stirring arm 136c, the stirring arm 136d, and the central arm 132. The second inner blade 164 is connected to the end arm 134, the stirring arm 136c, the stirring arm 136d, and the central arm 132. Note that the end arm 134, the stirring arm 136c, the stirring arm 136d, and the central arm 132 connected to the second inner blade 164 are shorter than the end arm 134, the stirring arm 136c, the stirring arm 136d, and the central arm 132 connected to the second outer blade 162.

As shown in FIG. 4B, the end arm 134 has a triangular cross section. In this embodiment, the cross section of the end arm 134 is an isosceles triangle having a base 134a that is approximately parallel to the mirror plate 114 at the end of the rotating shaft 120 and a vertex 134b at the center of the rotating shaft 120. In other words, the side 134c connecting the base 134a and the vertex 134b is a straight line.

As shown in FIG. 4C, the agitator arm 136d connects the rotating shaft 120 and the second inner blade 164. The agitator arm 136d has a rectangular cross section. In this embodiment, the cross section of the agitator arm 136d is a parallelogram having two sides 138a that face each other in the ±X-axis direction in FIG. 4C and two sides 138b that face each other in the Z-axis direction in FIG. 4C. The surface 138c that corresponds to the side 138a in the agitator arm 136d is approximately parallel to the second inner blade 164. In addition, the surface 138d that corresponds to the side 138b in the agitator arm 136d is approximately parallel to the extension direction of the rotating shaft 120.

Similarly, the cross section of the agitator arm 136a is rectangular with a surface that is approximately parallel to the first outer blade 152. The cross section of the agitator arm 136b is rectangular with a surface that is approximately parallel to the first inner blade 154. The cross section of the agitator arm 136c is rectangular with a surface that is approximately parallel to the second outer blade 162.

As described above, the drying device 100 according to this embodiment includes the stirring arm 136. As described above, the stirring arm 136 has a surface that is approximately parallel to the stirring blade 140. This allows the stirring arm 136 to assist the function of the stirring blade 140, that is, the function of fluidizing the workpiece (pushing the workpiece by rotation). Therefore, compared to a conventional drying device in which all arms are cylindrical, the drying device 100 can reduce the number of locations in the container 110 where the fluidity of the workpiece is low. The stirring arm 136 can improve the fluidity of the workpiece, particularly in the vicinity of the rotation shaft 120, that is, at the base of the stirring arm 136. Therefore, the drying device 100 can improve the stirring efficiency of the workpiece and the drying efficiency of the workpiece.

In addition, the agitator arm 136 has a rectangular cross-sectional shape, and therefore has a larger specific surface area compared to conventional techniques in which the arm is cylindrical. This allows the drying device 100 to have a larger contact area between the agitator arm 136 and the workpiece, i.e., a larger heat transfer area, than conventional techniques. Therefore, the drying device 100 is able to heat (dry) the workpiece more efficiently than conventional techniques.

As described above, the end arm 134 provided near the mirror plate 114 has a base 134a that is approximately parallel to the mirror plate 114 at the end of the rotating shaft 120, and has a triangular cross section with a vertex 134b at the center of the rotating shaft 120. Therefore, even if the rotating shaft 120 rotates, the end arm 134 can prevent the surface corresponding to the base 134a from pressing the workpiece against the mirror plate 114. In addition, the end arm 134 can move the workpiece to the approximately center side of the rotating shaft 120 by the surface corresponding to the side 134c due to the rotation of the rotating shaft 120. Therefore, the end arm 134 can suppress the movement of the workpiece to the mirror plate 114. As a result, the end arm 134 can suppress the retention of the workpiece near the mirror plate 114, and improve the stirring efficiency of the workpiece.

As described above, the central arm 132, which is provided at approximately the center of the rotating shaft 120, is cylindrical. This allows the central arm 132 to avoid impeding the flow of the workpiece by the first blade unit 150 and the flow of the workpiece by the second blade unit 160. Therefore, the drying device 100 can improve the stirring efficiency of the workpiece.

[First embodiment]
A simulation of the flow velocity distribution of a fluid was performed using the drying apparatus 100 according to the present embodiment (Example) and a conventional agitator (Comparative Example) in which all arms are cylindrical. The fluid used was simulated sludge.

Figure 5 is a diagram illustrating the flow velocity distribution. Figure 5A is a diagram illustrating the flow velocity distribution of an embodiment. Figure 5B is a diagram illustrating the flow velocity distribution of a comparative example.

As shown in Figure 5B, the mixing device of the comparative example showed almost no fluid flow in the area surrounded by the dashed line.

In contrast, as shown in FIG. 5A, the drying device 100 of the embodiment was found to improve the fluid flow rate in the areas surrounded by the dashed lines, that is, between agitator arm 136a and agitator arm 136b, and between agitator arm 136c and agitator arm 136d.

Figure 6 is a diagram illustrating the relationship between the proportion of the region in the container where the fluid mixing ratio is 40% or more and less than 60% and the mixing time. In Figure 6, the horizontal axis indicates the mixing time [s (seconds)]. In Figure 6, the vertical axis indicates the proportion [%] of the region where the fluid mixing ratio is 40% or more and less than 60%. In Figure 6, squares indicate examples and circles indicate comparative examples.

As shown in Figure 6, it was found that in the Example, as the mixing time increases, the proportion of the region where the fluid mixing rate is 40% or more and less than 60% increases more than in the Comparative Example. In addition, when the mixing time is 14 seconds, it was found that in the Example, the proportion of the region where the fluid mixing rate is 40% or more and less than 60% increases by about 28% more than in the Comparative Example.

The above results confirm that the drying device 100 according to this embodiment, unlike the comparative example, can reduce areas where the fluid barely flows (areas where fluidity is low).

[Second embodiment]
The drying device 100 according to the present embodiment (Example) and a conventional stirring device (Comparative Example) in which all arms are cylindrical were used to stir for a predetermined time (60 seconds), and the mixing ratio (%) of the fluid during stirring was measured. A colored polymer was used as the fluid. The mixing ratio was calculated using image processing.

Figure 7 is a diagram explaining the blending ratio of polymers. Figure 7A is a diagram explaining the results of the first test. Figure 7B is a diagram explaining the results of the second test. Figure 7C is a diagram explaining the results of the third test. Figure 7D is a diagram explaining the results of the fourth test. Figure 7E is a diagram explaining the results of the fifth test. In Figures 7A to 7E, the horizontal axis indicates the polymer ratio [%]. In Figures 7A to 7E, the vertical axis indicates the region. In Figures 7A to 7E, squares indicate examples and circles indicate comparative examples. In Figures 7A to 7E, the closer the polymer ratio is to 50%, the higher the blending ratio.

As shown in Figures 7A to 7E, the examples had more regions where the polymer ratio was closer to 50% than the comparative examples.

From the above results, it was confirmed that the drying device 100 according to this embodiment has a higher fluid mixing rate throughout the entire area of the container 110 than the comparative example.

[Third Example]
A slurry with a moisture content of 99% (corresponding to a moisture content of 80% of sludge) was dried using the drying apparatus 100 (Example) according to this embodiment and a conventional agitation apparatus (Comparative Example) in which all arms are cylindrical.

Figure 8 is a diagram explaining the drying time. In Figure 8, the horizontal axis indicates the drying time [min (minutes)]. In Figure 8, the vertical axis indicates the moisture content [%]. In Figure 8, squares indicate examples, and circles indicate comparative examples.

As shown in Figure 8, the time required for the slurry moisture content to reach 96% (corresponding to a sludge moisture content of 60%) was shortened by approximately 25 minutes in the embodiment compared to the comparative example.

These results confirm that the drying device 100 according to this embodiment can dry the workpiece in a shorter time than the comparative example.

Although the embodiments have been described above with reference to the attached drawings, it goes without saying that the present disclosure is not limited to the above-described embodiments. It is clear that a person skilled in the art can come up with various modified or revised examples within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present disclosure.

For example, in the above-described embodiment, the drying device 100 is provided with a heating unit 170. However, the heating unit 170 is not an essential component. For example, an agitation device is provided that includes a container 110, a rotating shaft 120, an arm 130, and an agitation blade 140.

In the above embodiment, the cross section of the agitator arm 136 is rectangular. However, the shape of the agitator arm 136 is not limited as long as it has a surface that is approximately parallel to the agitator blade 140. For example, the cross section of the agitator arm 136 may be polygonal.

In the above embodiment, the agitator arm 136 has all cross sections that are rectangular. However, at least a portion of the cross section of the agitator arm 136, for example, a cross section within a predetermined range from the rotation shaft 120, may be rectangular or polygonal.

In the above embodiment, the cross section of the end arm 134 is triangular. However, the shape of the end arm 134 is not limited as long as it is not shaped to press the workpiece against the mirror plate 114 in response to the rotation of the rotating shaft 120. The end arm 134 has an inclined surface inclined with respect to the axial direction of the rotating shaft 120, and does not have an inclined surface that approaches the end side of the rotating shaft 120 as it moves from the front of the rotating shaft 120 to the rear of the rotating shaft 120. In other words, the end arm 134 has an inclined surface facing the mirror plate 114, and does not have an inclined surface in which the distance from the mirror plate 114 gradually increases from the end of the rotating shaft 120 to the center of the rotating shaft 120. If the end arm 134 has the above inclined surface, the inclined surface will press the workpiece against the mirror plate 114 due to the rotation of the rotating shaft 120. Therefore, by not having the inclined surface, the end arm 134 can avoid the workpiece being pressed against the mirror plate 114 by the rotation of the rotating shaft 120.

The end arm 134 may have a shape that moves the workpiece toward the center of the rotating shaft 120 in response to the rotation of the rotating shaft 120. The end arm 134 may have an inclined surface that is inclined with respect to the axial direction of the rotating shaft 120, and that approaches the center of the rotating shaft 120 as it moves from the front of the rotating shaft 120 to the rear of the rotating shaft 120. This allows the end arm 134 to move the workpiece toward the center of the rotating shaft 120. The cross section of the end arm 134 may be, for example, a curved shape in which the shape of the two sides 134c gradually decreases the distance between the two sides 134c toward approximately the center of the rotating shaft 120. The cross section of the end arm 134 may also be rectangular. In this case, the end arm 134 may be a trapezoid having a lower base approximately parallel to the mirror plate 114 on the end side of the rotating shaft 120 and an upper base on the center side of the rotating shaft 120.

In the above embodiment, the cross section of the central arm 132 is circular. However, if the agitator blade 140 has a shape that moves the fluid medium in one direction, the cross section of the central arm 132 may be substantially the same as that of the agitator arm 136.

In the above embodiment, the arm 130 includes the central arm 132, the end arm 134, and the agitator arm 136. However, the arm 130 may be entirely composed of the agitator arm 136. The arm 130 may be composed of the central arm 132 and the agitator arm 136. The arm 130 may be composed of the central arm 132 and the end arm 134.

In the above embodiment, the rotating shaft 120 extends horizontally. However, the rotating shaft 120 may extend vertically or may be tilted at a predetermined angle from the horizontal. When the rotating shaft 120 extends vertically, the outer cylinder 112 may also be installed so that its axial direction is vertical. In this case, the mirror plate 114 that seals the upper end of the outer cylinder 112 may be omitted. In this case, the cross section of the uppermost arm 130 among the arms 130 may be rectangular. In other words, the uppermost arm 130 may be an agitating arm 136.

This disclosure can contribute, for example, to Sustainable Development Goal (SDG) Goal 7: "Ensure access to affordable, reliable, sustainable and modern energy."

100 Drying device (stirring device)
110: container 112: outer cylinder 114: end plate 120: rotating shaft 130: arm 132: central arm (third arm)
134 End arm (second arm)
136 Agitation arm (first arm)
136a Agitation arm (first arm)
136b Agitation arm (first arm)
136c Agitation arm (first arm)
136d Agitation arm (first arm)
140 stirring blade 170 heating section

Claims (4)

A container having a cylindrical outer cylinder and a plate sealing at least one end of the outer cylinder in an axial direction, the container containing the object to be treated;
A rotating shaft rotatably provided within the container;
a plurality of arms extending from the rotation shaft and spaced apart from each other in a circumferential direction and an extending direction of the rotation shaft;
Agitating blades attached to the tips of the arms and curved in the direction of rotation of the rotating shaft;
Equipped with
The stirring blade moves the object to a substantially center of the extension direction of the rotation shaft by the rotation of the rotation shaft,
The plurality of arms include
A first arm having at least a portion of a cross section of a polygonal shape;
A second arm is provided near the end plate and is not shaped to press the workpiece against the end plate in response to rotation of the rotation shaft;
a third arm provided at approximately the center in the extending direction of the rotation shaft, at least a portion of which has a circular cross section;
Including,
the first arm is provided between the second arm and the third arm in an extension direction of the rotation shaft,
the second arm has a first surface that is substantially parallel to the end plate, and a second surface that is disposed closer to the third arm than the first surface and is inclined with respect to the first surface,
a mixing device , wherein the second surface of the second arm is inclined in a direction away from the first surface as it moves from a front side in a rotation direction of the rotation shaft to a rear side in the rotation direction . 2. The agitating device according to claim 1 , wherein the cross section of the first arm is rectangular having a surface substantially parallel to the agitating blade. The agitation device according to claim 1 or 2 , further comprising a heating unit for heating the object to be processed housed in the container. A container having a cylindrical outer cylinder and a plate sealing at least one end of the outer cylinder in an axial direction, the container containing the object to be treated;
A rotating shaft rotatably provided within the container;
a plurality of arms extending from the rotation shaft and spaced apart from each other in a circumferential direction and an extending direction of the rotation shaft;
Agitating blades attached to the tips of the arms and curved in the direction of rotation of the rotating shaft;
A heating unit that heats the object to be treated contained in the container;
Equipped with
The stirring blade moves the object to a substantially center of the extension direction of the rotation shaft by the rotation of the rotation shaft,
The plurality of arms include
A first arm having at least a portion of a cross section of a polygonal shape;
A second arm is provided near the end plate and is not shaped to press the workpiece against the end plate in response to rotation of the rotation shaft;
a third arm provided at approximately the center in the extending direction of the rotation shaft, at least a portion of which has a circular cross section;
Including,
the first arm is provided between the second arm and the third arm in an extension direction of the rotation shaft,
the second arm has a first surface that is substantially parallel to the end plate, and a second surface that is disposed closer to the third arm than the first surface and is inclined with respect to the first surface,
a drying device , wherein the second surface of the second arm is inclined in a direction away from the first surface as it moves from a front side in a rotation direction of the rotation shaft to a rear side in the rotation direction .

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