Mixing and drying equipment

Abstract

To improve agitation efficiency.SOLUTION: An agitating device (drying device 100) comprises: a container 110 that stores a treated object; a rotary shaft 120 that is rotatably provided in the container 110; a plurality of arms 130 that are erected from the rotary shaft 120, are separated in a circumferential direction of the rotary shaft 120 and an extension direction of the rotary shaft 120, and include a first arm with at least a part of its cross section having a polygon shape; and an agitating blade 140 that is mounted on the tip of the plurality of arms 130 and is curved in a rotating direction of the rotary shaft 120.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a mixing device and a drying device. [Background technology]

[0002] Ribbon mixers are widely used as mixing devices for mixing materials to be processed, 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 materials 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 curved in the direction of rotation of the rotating shaft. The ribbon mixer mixes the materials to be processed by fluidizing them with the mixing blade that rotates along with the rotating shaft. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2000-74565 A Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional ribbon mixers such as that described in Patent Document 1, there is a demand for development of a technique for improving the mixing efficiency.

[0005] In view of the above problems, the present disclosure has an object to provide an agitation device and a drying device capable of improving the agitation efficiency. [Means for solving the problem]

[0006] In order to solve the above problems, a stirring device according to one embodiment of the present disclosure is The present invention has a cylindrical outer cylinder and a head plate that seals at least one end of the outer cylinder in the axial direction, The present invention relates to a container for accommodating a material to be treated, a rotating shaft rotatably provided within the container, and a plurality of axially extending members arranged vertically from the rotating shaft and spaced apart from each other in the circumferential direction and the extending direction of the rotating shaft. Ta The stirring device has a plurality of arms and stirring blades attached to the tips of the arms and curved in the direction of rotation of the rotating shaft. The stirring blade moves the material to be treated toward approximately the center of the extension direction of the rotating shaft by the rotation of the rotating shaft, and the multiple arms include a first arm having at least a partial polygonal cross section, a second arm provided near the end plate and not shaped to press the material to be treated against the end plate in response to the rotation of the rotating shaft, and a third arm provided approximately in the center of the extension direction of the rotating shaft and having at least a partial circular cross section, the first arm is provided between the second arm and the third arm in the extension direction of the rotating shaft, the second arm has a first surface that is approximately parallel to the end plate and a second surface that is provided closer to the third arm than the first surface and is inclined with respect 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 of the rotation direction of the rotating shaft to the rear of the rotation direction. .

[0008] The cross section of the first arm may be rectangular with a surface substantially parallel to the stirring blade.

[0010] The container may include a heating section for heating the object to be treated housed in the container.

[0011] In order to solve the above problems, a drying device according to one aspect of the present disclosure includes: The present invention has a cylindrical outer cylinder and a head plate that seals at least one end of the outer cylinder in the axial direction, The present invention relates to a container for accommodating a material to be treated, a rotating shaft rotatably provided within the container, and a plurality of axially extending members arranged vertically from the rotating shaft and spaced apart from each other in the circumferential direction and the extending direction of the rotating shaft. Ta The apparatus includes a plurality of arms, stirring blades attached to the tips of the arms and curved in the direction of rotation of the rotating shaft, and a heating unit for heating the object to be treated contained in the container. The stirring blade moves the material to be treated toward approximately the center of the extension direction of the rotating shaft by the rotation of the rotating shaft, The multiple arms include a first arm having at least a portion of a polygonal cross section, a second arm provided near the head plate and not shaped to press the workpiece against the head plate in response to rotation of the rotating shaft, and a third arm provided approximately in the center of the extending direction of the rotating shaft and having at least a portion of a circular cross section, the first arm being provided between the second arm and the third arm in the extending direction of the rotating shaft, the second arm having a first surface that is approximately parallel to the head 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 of the rotating direction of the rotating shaft to the rear of the rotating direction. . Effect of the Invention

[0012] According to the present disclosure, it is possible to improve the stirring efficiency. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram illustrating a drying device according to an embodiment. [Diagram 2] FIG. 2 is a first diagram for explaining the flow direction of the material to be processed by the stirring blade. [Diagram 3] FIG. 3 is a second diagram illustrating the flow direction of the material to be processed caused by the stirring blade. [Figure 4] FIG. 4 is a diagram illustrating an arm according to the embodiment. [Diagram 5] FIG. 5 is a diagram illustrating the flow velocity distribution. [Figure 6]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. [Figure 7] FIG. 7 is a diagram illustrating the blend ratio of polymers. [Figure 8] FIG. 8 is a diagram illustrating the drying time. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical 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 repeated explanations, and elements not directly related to the present disclosure are not illustrated.

[0015] Fig. 1 is a diagram illustrating a drying device 100 according to this embodiment. In Fig. 1, a dashed arrow indicates the rotation direction of a rotating shaft 120. In Fig. 1 and other 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 in the figures.

[0016] The drying device 100 dries an 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 (agitation device) includes a container 110, a rotating shaft 120, a plurality of arms 130, an agitation blade 140, and a heating unit 170.

[0017] The container 110 contains the object to be treated. The container 110 includes an outer cylinder 112 and an end plate 114. The outer cylinder 112 is a cylindrical hollow member. The end plate 114 seals 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 directions in FIG. 1).

[0018] A supply pipe 112a and a discharge pipe 112b are connected to the outer cylinder 112. The supply pipe 112a is connected to approximately the center of the upper part of the outer cylinder 112. The object to be dried is introduced into the container 110 through the supply pipe 112a. An opening / closing valve 116a is provided in the supply pipe 112a.

[0019] Discharge pipe 112b communicates with approximately the center of the lower part of outer cylinder 112. The dried object is discharged from container 110 through discharge pipe 112b. An opening / closing valve 116b is provided in discharge pipe 112b.

[0020] The rotating shaft 120 is rotatably provided in the container 110. The rotating shaft 120 is provided in the container 110 so as to extend in the extension direction of the outer cylinder 112. That is, the rotating shaft 120 extends in the horizontal direction (±X-axis direction in FIG. 1). In this embodiment, the rotating shaft 120 is provided in 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 direction A or B in FIG. 1 by a motor (not shown).

[0021] 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 direction in which the rotating shaft 120 extends.

[0022] The agitating blade 140 is attached to the tip of a plurality of arms 130. The agitating blade 140 is a spiral-shaped flat plate curved in the rotation direction of the rotating shaft 120. The agitating blade 140 is provided at a distance from the rotating shaft 120 by the arm 130. The agitating blade 140 moves the material to be processed toward approximately the center of the rotating shaft 120 by the rotation of the rotating shaft 120. In this embodiment, the agitating blade 140 includes a first blade unit 150 and a second blade unit 160.

[0023] The first blade unit 150 is provided from one end (the 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 and the first outer blade 152 have a spiral winding direction opposite to that of the first outer blade 152.

[0024] The second blade unit 160 is provided from the other end (the 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. In addition, the first inner blade 154 and the second outer blade 162 have the same spiral winding direction.

[0025] The heating unit 170 heats the workpiece housed 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 .

[0026] Next, 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.

[0027] 2 and 3 are diagrams for explaining the flow direction of the material to be treated by the stirring blade 140. As shown in Fig. 2, when the rotating shaft 120 rotates in the A direction in Fig. 2 (counterclockwise when viewed from the +X side in Fig. 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 end plate 114) as shown by the white arrow in Fig. 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 Fig. 2.

[0028] On the other hand, the second outer blade 162 of the second blade unit 160 moves the workpiece in the +X-axis direction (toward the right end plate 114) as shown by the white arrow in Fig. 2. Also, the second inner blade 164 of the second blade unit 160 moves the workpiece in the -X-axis direction (approximately the center of the vessel 110) as shown by the black arrow in Fig. 2.

[0029] 3, when the rotating shaft 120 rotates in the B direction in FIG. 3 (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 shown 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 end panel 114) as shown by the black arrow in FIG. 3.

[0030] On the other hand, the second outer blade 162 of the second blade unit 160 moves the workpiece in the -X-axis direction (toward approximately the center of the container 110) as shown by the white arrow in Fig. 3. Also, the second inner blade 164 of the second blade unit 160 moves the workpiece in the +X-axis direction (toward the right end panel 114) as shown by the black arrow in Fig. 3.

[0031] A motor (not shown) alternately switches the rotation direction of the rotating shaft 120 between direction A and direction B. This reverses the flow direction of the material to be processed by the stirring blade 140. Therefore, the stirring blade 140 can efficiently stir the material to be processed.

[0032] This increases the frequency of contact between the container 110 heated by the heating unit 170 and the object to be treated, and between the rotating shaft 120 heated by the heating unit 170 and the object to be treated. In this way, the drying device 100 dries the object to be treated. When the drying of the object to be treated is completed, the on-off valve 116b is opened, the rotating direction of the rotating shaft 120 is set to direction B, and the object to be treated is gathered at approximately the center of the container 110 and discharged to the outside from the discharge pipe 112b.

[0033] Incidentally, in the conventional drying device, all the arms are cylindrical. The stirring effect of the stirring blades is less effective on the rotating shaft side than the inner blade of the stirring blade. For this reason, if all the arms are cylindrical, the fluidity of the material to be treated is reduced near the rotating shaft in the container, that is, at the base of the arm. Therefore, the drying device 100 according to the present embodiment can reduce the places where the fluidity of the material to be treated is reduced by devising the shape of the arm 130. The shape of the arm 130 according to the present embodiment will be described below.

[0034] Fig. 4 is a diagram illustrating the arm 130 according to this embodiment. Fig. 4A is a diagram illustrating the rotating shaft 120 and the arm 130. Fig. 4B is a diagram illustrating the end arm 134 on the left side in Fig. 4A. Fig. 4C is a diagram illustrating the stirring arm 136d.

[0035] As shown in FIG. 4A, the arm 130 includes a central arm 132 , an end arm 134 , and an agitating arm 136 .

[0036] 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.

[0037] Two end arms 134 (second arms) are provided on each end of the rotating shaft 120 (four in total). That is, the end arms 134 are provided in the vicinity of the end plate 114. The angle formed by the two end arms 134 provided on one end or the other end of the rotating shaft 120 is, for example, 90°.

[0038] 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. The agitation arms 136a and 136b are provided between the end arm 134 on the left side in FIG. 4A and the central arm 132. The 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 arms).

[0039] 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°.

[0040] In the extension direction of the rotating 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.

[0041] 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.

[0042] 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.

[0043] 4B, the end arm 134 has a triangular cross section. In this embodiment, the cross-sectional shape of the end arm 134 is an isosceles triangle having a base 134a that is approximately parallel to the end plate 114 at the end side of the rotating shaft 120 and a vertex 134b at the center side of the rotating shaft 120. In other words, a side 134c connecting the base 134a and the vertex 134b is a straight line.

[0044] As shown in FIG. 4C, the agitation arm 136d connects the rotating shaft 120 and the second inner blade 164. The agitation arm 136d has a rectangular cross section. In this embodiment, the cross section of the agitation arm 136d is a parallelogram having two sides 138a facing each other in the ±X-axis direction in FIG. 4C and two sides 138b facing each other in the Z-axis direction in FIG. 4C. The surface 138c corresponding to the side 138a in the agitation arm 136d is approximately parallel to the second inner blade 164. In addition, the surface 138d corresponding to the side 138b in the agitation arm 136d is approximately parallel to the extension direction of the rotating shaft 120.

[0045] Similarly, the cross section of the agitating arm 136a is rectangular with a surface approximately parallel to the first outer blade 152. The cross section of the agitating arm 136b is rectangular with a surface approximately parallel to the first inner blade 154. The agitating arm 136c is rectangular with a surface approximately parallel to the second outer blade 162.

[0046] As described above, the drying device 100 according to the present 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 places 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.

[0047] In addition, since the cross-sectional shape of the agitating arm 136 is rectangular, the specific surface area is larger than that of the conventional art in which the arm is cylindrical. Therefore, the drying device 100 can increase the contact area between the agitating arm 136 and the workpiece, that is, the heat transfer area, compared to the conventional art. Therefore, the drying device 100 can heat (dry) the workpiece more efficiently than the conventional art.

[0048] As described above, the end arm 134 provided near the end plate 114 has a base 134a that is approximately parallel to the end 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 end plate 114. Furthermore, 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 end plate 114. As a result, the end arm 134 can suppress the retention of the workpiece near the end plate 114, and the stirring efficiency of the workpiece can be improved.

[0049] As described above, the central arm 132 provided at approximately the center of the rotating shaft 120 has a cylindrical shape. This makes it possible for the central arm 132 to avoid a situation in which the flow of the workpiece by the first blade unit 150 and the flow of the workpiece by the second blade unit 160 are hindered. Therefore, the drying device 100 can improve the stirring efficiency of the workpiece.

[0050] [First Example] A simulation of the flow velocity distribution of a fluid was performed using the drying apparatus 100 according to this embodiment (Example) and a conventional agitator (Comparative Example) in which all arms are cylindrical. The fluid used was simulated sludge.

[0051] Fig. 5 is a diagram for explaining the flow velocity distribution, Fig. 5A is a diagram for explaining the flow velocity distribution of an example, and Fig. 5B is a diagram for explaining the flow velocity distribution of a comparative example.

[0052] As shown in FIG. 5B, it was found that in the stirrer of the comparative example, the fluid hardly flowed in the region surrounded by the dashed line.

[0053] In contrast, as shown in FIG. 5A, it was found that the drying device 100 of the embodiment improves the fluid flow rate in the areas surrounded by dashed lines, that is, between agitation arms 136a and 136b, and between agitation arms 136c and 136d.

[0054] Fig. 6 is a diagram illustrating the relationship between the proportion of the region in a container where the fluid mixing ratio is 40% or more and less than 60% and the mixing time. In Fig. 6, the horizontal axis represents the mixing time [s (seconds)]. In Fig. 6, the vertical axis represents the proportion [%] of the region where the fluid mixing ratio is 40% or more and less than 60%. In Fig. 6, squares represent examples and circles represent comparative examples.

[0055] 6, it was found that in the Example, as the stirring time increases, the ratio of the region where the mixing ratio of the fluid is 40% or more and less than 60% increases more than in the Comparative Example. Also, when the stirring time is 14 seconds, it was found that in the Example, the ratio of the region where the mixing ratio of the fluid is 40% or more and less than 60% increases by about 28% more than in the Comparative Example.

[0056] From the above results, it was confirmed that the drying device 100 according to this embodiment, unlike the comparative example, can reduce the number of areas where the fluid hardly flows (areas where the fluidity is low).

[0057] [Second Example] 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 also calculated using image processing.

[0058] FIG. 7 is a diagram for explaining the blending ratio of polymers. FIG. 7A is a diagram for explaining the results of the first test. FIG. 7B is a diagram for explaining the results of the second test. FIG. 7C is a diagram for explaining the results of the third test. FIG. 7D is a diagram for explaining the results of the fourth test. FIG. 7E is a diagram for explaining the results of the fifth test. In FIG. 7A to FIG. 7E, the horizontal axis indicates the polymer ratio [%]. In FIG. 7A to FIG. 7E, the vertical axis indicates the region. In FIG. 7A to FIG. 7E, squares indicate examples, and circles indicate comparative examples. In FIG. 7A to FIG. 7E, the closer the polymer ratio is to 50%, the higher the blending ratio is.

[0059] As shown in FIGS. 7A to 7E, it was found that the working example had more regions where the polymer ratio was close to 50% than the comparative example.

[0060] From the above results, it was confirmed that the drying apparatus 100 according to this embodiment has a higher mixing rate of the fluid over the entire area inside the container 110 than the comparative example.

[0061] [Third Example] A slurry with a water content of 99% (corresponding to a water content of 80% of sludge) was dried using the drying apparatus 100 according to this embodiment (Example) and a conventional agitator (Comparative Example) in which all arms are cylindrical.

[0062] Fig. 8 is a diagram illustrating the drying time. In Fig. 8, the horizontal axis represents the drying time [min (minutes)]. In Fig. 8, the vertical axis represents the moisture content [%]. In Fig. 8, squares represent examples, and circles represent comparative examples.

[0063] As shown in FIG. 8, it was found that the time required for the water content of the slurry to reach 96% (corresponding to a water content of 60% in sludge) was shorter by about 25 minutes in the example than in the comparative example.

[0064] From the above results, it was confirmed that the drying device 100 according to this embodiment can dry the workpiece in a shorter time than the comparative example.

[0065] Although the embodiments have been described above with reference to the accompanying 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 think of various modified or altered examples within the scope of the claims, and it is understood that these also naturally belong to the technical scope of the present disclosure.

[0066] For example, in the above-described embodiment, the drying device 100 includes the heating unit 170. However, the heating unit 170 is not an essential component. For example, an agitation device including a container 110, a rotating shaft 120, an arm 130, and an agitation blade 140 is provided.

[0067] In the above embodiment, the cross section of the agitation arm 136 is rectangular. However, the shape of the agitation arm 136 is not limited as long as it has a surface that is approximately parallel to the agitation blade 140. For example, the cross section of the agitation arm 136 may be polygonal.

[0068] In the above embodiment, the cross section of the agitating arm 136 is rectangular. However, at least a portion of the cross section of the agitating arm 136, for example, a cross section within a predetermined range from the rotating shaft 120, may be rectangular or polygonal.

[0069] 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 end plate 114 in response to the rotation of the rotating shaft 120. The end arm 134 may have an inclined surface inclined with respect to the axial direction of the rotating shaft 120, and may 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 may have an inclined surface facing the end plate 114, and may not have an inclined surface in which the distance from the end of the rotating shaft 120 to the center of the rotating shaft 120 gradually increases. If the end arm 134 has the inclined surface, the inclined surface will press the workpiece against the end 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 end plate 114 due to the rotation of the rotating shaft 120.

[0070] 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 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 have, 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 end plate 114 on the end side of the rotating shaft 120 and an upper base on the center side of the rotating shaft 120.

[0071] In the above embodiment, the cross section of the central arm 132 is circular. However, when the stirring blade 140 has a shape that moves the fluidized medium in one direction, the cross section of the central arm 132 may be substantially the same as that of the stirring arm 136.

[0072] In the above embodiment, the arm 130 includes the central arm 132, the end arm 134, and the agitating arm 136. However, the arm 130 may be entirely composed of the agitating arm 136. The arm 130 may be composed of the central arm 132 and the agitating arm 136. The arm 130 may be composed of the central arm 132 and the end arm 134.

[0073] 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 end plate 114 sealing 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 the stirring arm 136.

[0074] This disclosure can, for example, contribute to Sustainable Development Goal (SDG) 7: "Ensure access to affordable, reliable, sustainable and modern energy." [Explanation of symbols]

[0075] 100 Drying device (stirring device) 110 Container 112 Outer cylinder 114 Headboard 120 Rotational Axis 130 Arm 132 Central Arm (3rd 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

1. A container having a cylindrical outer cylinder and a mirror plate sealing at least one axial end of the outer cylinder, the container containing a workpiece; 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. 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.

3. 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.

4. A container having a cylindrical outer cylinder and a mirror plate sealing at least one axial end of the outer cylinder, the container containing a workpiece; 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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