Agitation device

Abstract

To further preferably remove a deposit generated in a casing with agitation of an object to be treated.SOLUTION: An agitation device has a rotary shaft, agitation blades attached to the rotary shaft and rotating with rotation of the rotary shaft, and a casing with the rotary shaft and the agitation blades built therein, and agitates an object to be treated introduced in the casing with rotation of the agitation blades. The agitation blade has an end face facing the casing at an end on an opposite side to an attachment end to the rotary shaft, and a polygonal plate attached to the end face. The plate has one principal face facing the end face, and one of corner parts of the polygon is attached to the end face toward a rotation direction of the agitation blade.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a stirring device. [Background technology]

[0002] Conventionally, as stirring devices for heating and stirring the material to be treated, for example, conical dryers, Nauta mixers, paddle dryers, double disk dryers, rotary dryers, etc. are known. A paddle dryer has a rotating shaft and a plurality of stirring blades attached to the rotating shaft, and can also be used for drying inorganic materials. For example, sediment generated during smelting can be dried and crushed in a large paddle dryer and then proceeded to the next drying process.

[0003] In this type of drying process, sediment may accumulate inside the casing of the paddle dryer, causing sticking. In such cases, the motor that rotates the rotating shaft may be overloaded, causing the device to break down, or the casing or stirring blades may be damaged.

[0004] Here, Patent Document 1 discloses an agitation device in which a roughly T-shaped jig is attached to the end of an agitation blade connected to a rotating shaft. In the agitation device disclosed in Patent Document 1, sediment accumulated at the bottom of the rotating shaft is scraped off by the jig when the agitation blade rotates. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2014-151232 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, the stirring device disclosed in Patent Document 1 has problems in that when performing metal smelting, etc., there is a risk that the jig will fall off the stirring blade during drying due to the generated sediment, and it is difficult to reduce the load on the device.

[0007] The present invention has been made in consideration of the problems associated with the conventional technology as described above, and aims to provide a mixing device that can more effectively remove sediment that forms in a casing as the material to be treated is mixed. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides A rotation axis; A stirring blade attached to the rotating shaft and rotated with the rotation of the rotating shaft; A casing incorporating the rotating shaft and the stirring blade; In the agitation device, the material to be treated is agitated by rotation of the agitation blade, The stirring blade has an end surface facing the casing at an end opposite to an end attached to the rotating shaft, A polygonal plate material is attached to the end surface, The plate material is characterized in that one main surface faces the end face and one corner of a polygon is attached to the end face so as to face in the rotation direction of the agitating blade.

[0009] In the present invention configured as described above, when sediment is attached to the inner surface of the casing, when the impeller rotates with the rotation of the rotating shaft, the plate attached to the end face of the impeller comes into contact with the sediment attached to the inner surface of the casing. At this time, the plate has a polygonal shape, and one of the corners of the polygon is attached to the end face of the impeller facing the rotation direction of the impeller, so that the sediment attached to the inner surface of the casing is easily scraped off by the plate. In addition, since one main surface of the plate is attached facing the end face of the impeller, it is difficult for the plate to fall off from the impeller.

[0010] The plate material may be rectangular or hexagonal. In such a configuration, for example, by making the plate material symmetrical in shape with respect to the rotation direction of the agitator blade, the sediment adhering to the inner surface of the casing can be scraped off by the plate material even when the rotation direction of the agitator blade is reversed.

[0011] The length of the plate in the direction of rotation of the impeller may be longer than the length in the direction perpendicular to the direction of rotation. In such a configuration, the plate can be firmly attached to the impeller while the sediment is easily scraped off by the plate.

[0012] The plate may be attached to the end surface by welding at a peripheral portion of one of the main surfaces. In such a configuration, the plate is firmly attached to the agitating blade.

[0013] The plate may have a through hole penetrating between one main surface and the other main surface, and the peripheral portion of the through hole may also be attached to the end surface by welding. In such a configuration, the plate is attached to the end surface of the impeller at the peripheral portion of the one main surface and the peripheral portion of the through hole, and the plate is attached to the impeller more firmly.

[0014] The distance between the other main surface of the plate material and the casing may be 5 mm to 50 mm.

[0015] Moreover, the plate member may have a corner portion with an angle of 60° to 135° facing the rotation direction of the stirring blade. Effect of the Invention

[0016] According to the present invention, sediment generated in the casing due to stirring of the material to be treated can be more effectively removed. [Brief description of the drawings]

[0017] [Figure 1] 1 is an external view showing one embodiment of a stirring device of the present invention. [Diagram 2] FIG. 2 is a diagram showing an internal configuration of the paddle dryer shown in FIG. [Diagram 3] 3A and 3B are diagrams for explaining the configuration of the stirring blade shown in FIG. 2, in which (a) is a front view, (b) is an external perspective view of the plate material, (c) is a side view, and (d) is an enlarged view of the vicinity of the area where the plate material is attached. [Figure 4] FIG. 4 is a diagram showing the positional relationship between the stirring blades and the casing shown in FIG. 3. [Diagram 5] 3 is a diagram for explaining the action of a plate member in the paddle dryer shown in FIG. 1 and FIG. 2. FIG. [Figure 6] 13 is a diagram for explaining the effect of attaching a plate material to an agitator blade with its corners facing in the rotation direction of the agitator blade. FIG. [Figure 7] 13A and 13B are views showing another embodiment of a plate material, in which (a) is an external perspective view, and (b) is a view showing a state where the plate material is attached to an end face of an agitating blade. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0019] In addition, in the description of the specification and drawings of each embodiment, components having substantially the same or corresponding functional configurations may be denoted by the same reference numerals to avoid redundant explanations. In addition, in order to facilitate understanding, the scale of each part in the drawings may differ from the actual scale.

[0020] (Overall composition) Fig. 1 is an external view showing one embodiment of the stirring device of the present invention, as seen from the side. Fig. 2 is a diagram showing the internal configuration of the paddle dryer 1 shown in Fig. 1, as seen from the direction of the arrow A shown in Fig. 1.

[0021] The agitation device in this embodiment is a paddle dryer 1 in which rotating shafts 20a, 20b and agitation blades 23a-1, 23a-2, 23b-1, and 23b-2 are built inside a casing 10, as shown in FIGS.

[0022] The casing 10 is made of a heat-resistant material and is configured, for example, by attaching a cover to a U-shaped horizontally elongated container. The casing 10 is provided with an inlet 11, an outlet 12, gas outlets 13a to 13c, 14, and legs 15a, 15b.

[0023] The inlet 11 is for introducing the material to be treated (raw material) into the casing 10 and is provided, for example, at an upper portion on one longitudinal end side of the casing 10. The inlet 11 has, for example, a cylindrical shape and is configured so that the material to be dried and stirred in the paddle dryer 1 can be introduced into the casing 10 in the direction of arrow D.

[0024] The discharge outlet 12 is for removing the material (dried product) that has been dried and stirred inside the casing 10 to the outside, and is provided, for example, facing downward at the other end in the longitudinal direction of the casing 10. The discharge outlet 12 has, for example, a cylindrical shape, and is configured to be able to discharge the material that has been dried and stirred in the paddle dryer 1 to the outside of the casing 10 in the direction of arrow E.

[0025] Gas exhaust ports 13a-13c are provided in the upper part of casing 10 to exhaust moisture and the like contained in the material to be treated that is generated as the material to be treated is dried and stirred in casing 10. Gas exhaust ports 13a-13c may be formed, for example, in the form of an openable and closable plate. In this case, gas exhaust ports 13a-13c communicate the inside and outside of casing 10 when open, and exhaust moisture and the like generated as the material to be treated is dried and stirred in casing 10 to the outside of casing 10.

[0026] Gas exhaust port 14 is for discharging moisture and the like contained in the treated material that is generated as the treated material is dried and stirred inside casing 10, and is provided in the upper part of casing 10. Gas exhaust port 14 has, for example, a cylindrical shape, and is configured to be able to discharge moisture and the like that is generated as the treated material is dried and stirred inside casing 10 to the outside of casing 10.

[0027] The legs 15a and 15b are attached to, for example, the side surface of the casing 10 so as to protrude downward from the bottom surface of the casing 10. The leg 15a is attached to one longitudinal end side of the casing 10 where the inlet 11 is provided, and the leg 15b is attached to the other longitudinal end side of the casing 10 where the outlet 12 is provided. The legs 15a and 15b have different lengths, and the length of the leg 15a is longer than the length of the leg 15b. As a result, the casing 10 is installed at an angle with respect to the installation surface 4 so that the one longitudinal end side of the casing 10 where the inlet 11 is provided is higher than the other longitudinal end side of the casing 10 where the outlet 12 is provided.

[0028] The rotating shafts 20a, 20b are disposed inside the casing 10 and parallel to each other in the longitudinal direction of the casing 10. The rotating shafts 20a, 20b are made of a metal such as stainless steel, and have a hollow structure.

[0029] Agitating blades 23a-1 and 23a-2 are attached to the rotating shaft 20a. The agitating blades 23a-1 and 23a-2 are hollow structures made of, for example, metal, and the inside of the hollow structure is connected to the inside of the hollow structure of the rotating shaft 20a. The agitating blades 23a-1 and 23a-2 are arranged in pairs, with each pair overlapping with a gap in the direction in which the rotating shaft 20a extends. The detailed shapes of the agitating blades 23a-1 and 23a-2 will be described later.

[0030] The stirring blades 23b-1 and 23b-2 are attached to the rotating shaft 20b. The stirring blades 23b-1 and 23b-2 are hollow structures made of metal such as stainless steel, and the inside of the hollow structure is connected to the inside of the hollow structure of the rotating shaft 20b. The stirring blades 23b-1 and 23b-2 are arranged in pairs, with each pair overlapping with a gap in the direction in which the rotating shaft 20b extends. The detailed shapes of the stirring blades 23b-1 and 23b-2 will be described later.

[0031] Parts of the rotating shafts 20a, 20b near both ends are exposed to the outside of the casing 10. Gears 24a, 24b are attached to the parts of the rotating shafts 20a, 20b that are exposed to the outside of the casing 10, respectively. The two gears 24a, 24b are arranged to mesh with each other, so that the rotating shafts 20a, 20b rotate in different directions.

[0032] A chain 3 is wound around the rotating shaft 20a near the portion where the gear 24a is attached. The chain 3 is wound around the rotating shaft 20a and the motor 2, so that the rotating shafts 20a and 20b rotate when the motor 2 rotates.

[0033] The ends of the rotating shafts 20a, 20b to which the gears 24a, 24b are attached are provided with a steam inlet 21. Steam can be introduced from this steam inlet 21 in the direction of arrow B into the inside of the hollow structure of the rotating shafts 20a, 20b.

[0034] A steam outlet 22 is provided at the end opposite to the end where the gears 24a, 24b of the rotating shafts 20a, 20b are attached. From this steam outlet 22, steam that has circulated inside the hollow structure of the rotating shafts 20a, 20b and the stirring blades 23a-1, 23a-2, 23b-1, 23b-2 can be discharged to the outside in the direction of arrow C.

[0035] (Configuration of mixing blades 23a-1, 23a-2, 23b-1, 23b-2) Fig. 3 is a diagram for explaining the configuration of the agitating blades 23a-1, 23a-2, 23b-1, and 23b-2 shown in Fig. 2, where (a) is a front view, (b) is an external perspective view of the plate material 30, (c) is a side view, and (d) is an enlarged view of the vicinity of the region where the plate material 30 is attached. Note that Fig. 3 shows only the configuration of the agitating blades 23a-1 and 23a-2, but the configuration of the agitating blades 23b-1 and 23b-2 is also similar.

[0036] As shown in FIG. 3, the agitator blades 23a-1, 23a-2 shown in FIG. 2 are arranged so that a pair of agitator blades 23a-1, 23a-2 arranged at the same position in the extension direction of the rotation shaft 20a form a circle via two missing portions 26a, 26b.

[0037] The thickness of the agitating blade 23a-1 is changed so that the thickness on the side of the missing portion 26a is thicker than the thickness on the side of the missing portion 26b. Therefore, the agitating blade 23a-1 has an end face 25 facing the casing at the end opposite the end attached to the rotating shaft 20a at least on the side of the missing portion 26a. On the other hand, the thickness of the agitating blade 23b-1 is changed so that the thickness on the side of the missing portion 26b is thicker than the thickness on the side of the missing portion 26a. Therefore, the agitating blade 23b-1 has an end face 25 facing the casing at the end opposite the end attached to the rotating shaft 20a at least on the side of the missing portion 26b.

[0038] A hexagonal plate 30 is attached to the end surface 25 of the agitating blade 23a-1. The plate 30 has two main surfaces 33a and 33b, one of which faces the end surface 25, and one corner 32 of the hexagon is attached to the end surface 25 facing the rotation direction F of the agitating blade 23a-1. The peripheral portion of the main surface 33a of the plate 30 forms a welded portion 31 and is attached to the end surface 25 by welding. The method of attaching the plate 30 to the end surface 25 is not limited to welding, but it is preferable to make it difficult for the plate 30 to fall off the end surface 25 due to the operation of the paddle dryer 1 as described later. From this point of view, welding is preferable.

[0039] The agitating blade 23a-2 also has a plate member 30 attached to an end surface 25 in the same manner as the agitating blade 23a-1.

[0040] The length L1 of the plate material 30 in the rotation direction of the agitating blade 23a-1 may be longer than the length L2 in the direction perpendicular to the rotation direction of the agitating blade 23a-1. With such a configuration, the plate material 30 can be firmly attached to the agitating blade 23a-1, while the sediment is easily scraped off by the plate material 30 due to the action described below.

[0041] Moreover, the angle Θ1 of the corner 32 of the plate material 30 is preferably 60° to 135° in order to make it easier for the plate material 30 to scrape off the object to be treated by the action described below.

[0042] FIG. 4 is a diagram showing the positional relationship between the agitating blades 23a-1 and 23a-2 shown in FIG.

[0043] As described below, the agitating blades 23a-1, 23a-2, 23b-1, and 23b-2 are fitted with plate materials 30 in order to scrape off sediment adhering to the inside of the casing 10. However, if the distance D1 between the plate material 30 and the casing 10 is too wide, the force for scraping off the sediment becomes insufficient, whereas if the distance D1 between the plate material 30 and the casing 10 is too narrow, the load when scraping off the sediment becomes large, reducing the durability of the device.

[0044] Therefore, the distance D1 between the main surface 33b of the plate material 30 opposite to the main surface 33a that is the mounting surface for the agitating blades 23a-1, 23a-2 and the casing 10 is preferably 5 mm to 50 mm. In this case, for example, the distance between the end surface 25 of the agitating blades 23a-1, 23a-2 and the casing 10 may be 5 mm to 50 mm, and the thickness of the plate material 30 may be 5 to 30 mm. Furthermore, the distance between the end surface 25 of the agitating blades 23a-1, 23a-2 and the casing 10 may be 5 mm to 30 mm, and the thickness of the plate material 30 may be 5 to 20 mm. More preferably, the distance between the end surface 25 of the agitating blades 23a-1, 23a-2 and the casing 10 may be 5 mm to 15 mm, and the thickness of the plate material 30 may be 6 to 12 mm. In particular, if the distance between the end faces 25 of the agitating blades 23a-1, 23a-2 and the casing 10 is too wide, the force of transporting the material from the inlet 11 side to the outlet 12 side decreases, which is undesirable.

[0045] (Paddle dryer 1 operation) The operation of the paddle dryer 1 configured as above will be described below.

[0046] In the paddle dryer 1 configured as described above, the material to be treated is introduced from the input port 11 while steam is being introduced from the steam inlet 21. The material to be treated that is stirred and dried in the paddle dryer 1 includes, in addition to sediment, high moisture content materials, muddy materials, polymer polymerization and modification, and synthetic resins, sludge, food, chemical products, etc. The shape of the material to be treated (raw material) input from the input port 11 is not particularly limited and may be fine powder, granules, pellets, flakes, etc., or may have a particle size or particulate shape.

[0047] The steam introduced from the steam inlet 21 circulates inside the hollow structure of the rotating shafts 20a, 20b and the stirring blades 23a-1, 23a-2, 23b-1, and 23b-2. This heats the rotating shafts 20a, 20b and the stirring blades 23a-1, 23a-2, 23b-1, and 23b-2. Note that the use of steam is not limited to heating the rotating shafts 20a, 20b and the stirring blades 23a-1, 23a-2, 23b-1, and 23b-2. Hot air or hot water may be circulated inside the hollow structure of the rotating shafts 20a, 20b and the stirring blades 23a-1, 23a-2, 23b-1, and 23b-2.

[0048] As described above, the casing 10 is installed at an incline with respect to the installation surface 4 so that one end in the longitudinal direction where the inlet 11 of the casing 10 is provided is higher than the other end in the longitudinal direction where the outlet 12 of the casing 10 is provided. Therefore, when the material to be treated is charged from the inlet 11, the material charged from the inlet 11 moves inside the casing 10 from the inlet 11 side to the outlet 12 side.

[0049] At that time, the rotating shafts 20a and 20b rotate with the rotation of the motor 2, and the material to be treated is transported and stirred by the stirring blades 23a-1, 23a-2, 23b-1, and 23b-2 attached to the rotating shafts 20a and 20b. In addition, the rotating shafts 20a and 20b and the stirring blades 23a-1, 23a-2, 23b-1, and 23b-2 are heated, so that the material to be treated is dried.

[0050] Thereafter, the stirred and dried processed material is discharged to the outside through the discharge port 12.

[0051] Furthermore, moisture and the like contained in the objects to be treated, which is generated as the objects to be treated are dried and stirred inside the casing 10, is discharged to the outside through the gas exhaust ports 13a to 13c and 14.

[0052] In this manner, the paddle dryer 1 in this embodiment can agitate and dry the material fed from the feed port 11 and discharge it as a dried product from the discharge port 12. In addition to treating sediment after a filter press, the paddle dryer is also used for treating high moisture content materials and muddy materials, and for polymer polymerization and modification treatment, and is used in a wide range of fields such as synthetic resins, sludge, food, and chemical products.

[0053] In this embodiment, the casing 10 is installed at an angle, so that the material to be treated that is put in through the inlet 11 moves from the inlet 11 side to the outlet 12 side inside the casing 10. However, the stirring blades 23a-1, 23a-2, 23b-1, and 23b-2 may be angled so as to guide the material in the casing 10 from the inlet 11 side to the outlet 12 side.

[0054] (Action by plate material 30) The action of the plate material 30 attached to the agitating blades 23a-1, 23a-2, 23b-1, and 23b-2 will be described below.

[0055] Fig. 5 is a diagram for explaining the action of the plate material 30 in the paddle dryer 1 shown in Fig. 1 and Fig. 2. Note that Fig. 5 shows only the action when the agitating blades 23a-1 and 23a-2 rotate, but the action when the agitating blades 23b-1 and 23b-2 rotate is similar.

[0056] In the paddle dryer 1 shown in Figures 1 and 2, when the material to be treated is subjected to the stirring and drying treatment as described above, sediment 5 is generated from the material to be treated, as shown in Figure 5(a), and in particular, this may accumulate and adhere to the bottom of the casing 10, causing settling.

[0057] When the amount of sediment 5 adhering to the casing 10 reaches a level where it comes into contact with the agitating blades 23a-1 and 23a-2, the rotation of the rotating shaft 20a is hindered, and a load is applied to the motor 2 for rotating the rotating shaft 20a, which may cause a breakdown of the paddle dryer 1. There is also a risk of damage to the casing 10 and the agitating blades 23a-1 and 23a-2. The sediment 5 adhering to the casing 10 in this way, particularly if made of metal, further hardens over time after adhering, making it difficult to remove.

[0058] 1 and 2, as described above, the plate material 30 is attached to the end surface 25 of the agitating blades 23a-1, 23a-2, 23b-1, and 23b-2, which is opposite to the end surface attached to the rotating shafts 20a and 20b. Therefore, when the agitating blades 23a-1, 23a-2, 23b-1, and 23b-2 rotate with the rotation of the rotating shafts 20a and 20b, the plate material 30 moves in the rotation direction F of the rotating shaft 20a along the outer periphery of the agitating blades 23a-1 and 23a-2 while protruding from the end surface of the agitating blades 23a-1 and 23a-2.

[0059] Then, as shown in FIG. 5(b), the sediment 5 adhering to the inner surface of the casing 10 comes into contact with the plate material 30 and is scraped off as the plate material 30 moves.

[0060] Thereafter, when the plate material 30 has passed through the area where the sediment 5 is attached, a gap 6 is generated between the stirring blades 23a-1, 23a-2 and the sediment 5, as shown in Fig. 5(c). This gap 6 has a distance of at least the height of the plate material 30.

[0061] Here, the load applied to the plate material 30 when scraping off the sediment 5 adhering to the inner surface of the casing 10 may be large depending on the material and the time that has passed since the adhering. Therefore, when the plate material 30 shown in Fig. 3 is attached so that its main surfaces 33a and 33b are perpendicular to the end surfaces 25 of the agitating blades 23a-1, 23a-2, 23b-1, and 23b-2, if the agitating blades 23a-1, 23a-2, 23b-1, and 23b-2 rotate with the plate material 30 in contact with the sediment 5, the plate material 30 may fall off from the agitating blades 23a-1, 23a-2, 23b-1, and 23b-2. Furthermore, even if the material of the sediment 5 is soft or the time that has passed since it attached to the casing 10 is short, if the paddle dryer 1 is operated for a long period of time, the plate material 30 may come into contact with and scrape off the sediment 5 multiple times, causing it to fall off from the stirring blades 23a-1, 23a-2, 23b-1, and 23b-2.

[0062] 1 and 2, the plate material 30 is attached so that the main surface 33a faces the end surface 25 of the agitating blades 23a-1, 23a-2, 23b-1, and 23b-2, as described above. Therefore, even if the plate material 30 comes into contact with and scrapes off the sediment 5 as described above, it is unlikely to fall off the agitating blades 23a-1, 23a-2, 23b-1, and 23b-2.

[0063] FIG. 6 is a diagram for explaining the effect of attaching plate material 30 to agitator blades 23a-1, 23a-2, 23b-1, and 23b-2 with corners 32 facing in the rotational direction of agitator blades 23a-1, 23a-2, 23b-1, and 23b-2.

[0064] As shown in FIG. 6(a), the plate material 30 moves to the area where the sediment 5 is attached, and as shown in FIG. 6(b), the plate material 30 comes into contact with the sediment 5 and moves further in the direction of the arrow G, scraping off the sediment 5 attached to the inner surface of the casing 10. At this time, as described above, the plate material 30 is attached to the end surface 25 of the stirring blades 23a-1, 23a-2, 23b-1, 23b-2 with one corner 32 of the hexagon facing the rotation direction of the stirring blades 23a-1, 23a-2, 23b-1, 23b-2. As a result, when the plate material 30 comes into contact with the sediment 5, the corner 32 is the part of the plate material 30 that first comes into contact with the sediment 5. Then, the sediment 5 comes into contact with the plate material 30 along a line by the corner 32, and a large pressure is applied to the sediment 5 by the corner 32. Therefore, the sediment 5 adhering to the inner surface of the casing 10 can be easily scraped off. Even if the sediment 5 is difficult to scrape off due to its material or the time that has passed since it was attached, the sediment 5 is crushed by the corners 32 of the plate material 30, and can be easily scraped off.

[0065] In this way, in the paddle dryer 1 of this embodiment, a hexagonal plate material 30 is attached to the end surface 25 of the agitating blades 23a-1, 23a-2, 23b-1, and 23b-2. Since the corners 32 of the hexagon are attached facing the rotation direction of the agitating blades 23a-1, 23a-2, 23b-1, and 23b-2, the sediment 5 attached to the inner surface of the casing 10 is easily scraped off by the plate material 30. In addition, since one main surface of the plate material 30 is attached facing the end surface 25 of the agitating blades 23a-1, 23a-2, 23b-1, and 23b-2, it is difficult for the plate material 30 to fall off from the agitating blades 23a-1, 23a-2, 23b-1, and 23b-2. This makes it possible to more suitably remove the sediment generated in the casing 10 due to the agitation of the material to be treated.

[0066] It is also possible to scrape off the sediment 5 adhering to the inner surface of the casing 10 by forming the stirring blades 23a-1, 23a-2, 23b-1, and 23b-2 into a shape having a protrusion such as the plate material 30 on the end surface 25. However, in such a configuration, when the protrusion wears off with the use of the paddle dryer 1, it becomes necessary to replace the stirring blades 23a-1, 23a-2, 23b-1, and 23b-2 themselves. In contrast, the paddle dryer 1 in this embodiment has the plate material 30 attached to the end surface 25 of the stirring blades 23a-1, 23a-2, 23b-1, and 23b-2 as a configuration for scraping off the sediment 5 adhering to the inner surface of the casing 10. Therefore, when the plate material 30 wears off, it is only necessary to replace the plate material 30, and it is possible to avoid the replacement work becoming complicated and the associated high cost.

[0067] In this embodiment, the plate material 30 is hexagonal, but the shape of the plate material 30 is not limited to a hexagon as long as it is a polygon having corners. In this case, the same effect as described above can be obtained by attaching the corners to the end surface 25 of the agitator blade with the corners facing the rotation direction of the agitator blade. For example, by making the plate material 30 into an equilateral triangle to a regular octagon, the angle Θ1 of the corners 32 of the plate material 30 can be set to 60° to 135° as described above. However, if the plate material 30 is a square or hexagonal shape, the plate material 30 can be made symmetrical in the front-rear direction with respect to the rotation direction of the agitator blade, so that the sediment 5 attached to the inner surface of the casing 10 can be scraped off by the plate material 30 even when the rotation direction of the agitator blade is reversed.

[0068] Also, the shape of the main surface 33a of the plate material 30 on the side attached to the stirring blade may be made smaller than the shape of the main surface 33b on the opposite side, so that the main surface 33b protrudes from the main surface 33a. In this case, an acute angle is generated from the main surface 33b to the side, which makes it easier to scrape off the sediment 5 adhering to the inner surface of the casing 10.

[0069] In the above-described embodiment, the configuration in which the two rotating shafts 20a, 20b are arranged parallel to each other in the longitudinal direction of the casing 10 inside the casing 10 has been described as an example. However, the paddle dryer may have only one rotating shaft. Even in this case, the same effect as above can be obtained by attaching a plate member to the end of the stirring blade attached to the rotating shaft.

[0070] (Another embodiment of the plate material) FIG. 7 shows another embodiment of the plate material, where (a) is an external perspective view, and (b) shows a state where it is attached to the end surface 25 of the stirring blade.

[0071] As shown in Fig. 7, the plate material 130 in this embodiment has a through hole 134. The through hole 134 penetrates between one main surface 133a and the other main surface 133b of the plate material 130. In such a plate material 130, the peripheral portion of the main surface 133a of the plate material 130 becomes a welded portion 131a and is attached to the end surface 25 by welding, and the peripheral portion of the through hole 134 also becomes a welded portion 131b and is attached to the end surface by welding. This allows the plate material 130 to be attached more firmly to the end surface 25 of the stirring blade.

[0072] In the above embodiment, a paddle dryer is used as an example of the agitator. However, the agitator of the present invention can be appropriately applied to any agitator that has a rotating shaft and an agitator blade attached to the rotating shaft housed in a casing and that rotates with the rotation of the rotating shaft.

[0073] Although the present invention has been described above based on the embodiments, the present invention is not limited to these embodiments. Various changes, modifications, substitutions, additions, deletions, and combinations of the above-mentioned embodiments are possible within the scope of the claims, and these also belong to the technical scope of the present invention. [Explanation of symbols]

[0074] 1 paddle dryer 2 Motors 3. Chain 4 Installation surface 5 Sediment 6. Gap 10 Casing 11 Inlet 12 Outlet 13a~13c,14 Gas exhaust port 15a,15b Legs 20a, 20b Rotating shaft 21 Steam inlet 22 Steam outlet 23a-1, 23a-2, 23b-1, 23b-2 Agitator blade 24a,24b Gear 25 End face 26a, 26b Missing part 30,130 Board materials 31,131a,131b Welding 32 Corner 33a,33b,133a,133b Main surface 134 Through hole

Claims

1. A rotation axis; A stirring blade attached to the rotating shaft and rotated with the rotation of the rotating shaft; A casing incorporating the rotating shaft and the stirring blade; In the agitation device, the material to be treated is agitated by rotation of the agitation blade, The stirring blade has an end surface facing the casing at an end opposite to an end attached to the rotating shaft, A polygonal plate material is attached to the end surface, The plate material is attached to the end face with one main surface facing the end face and one corner of a polygon facing in the rotation direction of the mixing blade, in the mixing device.

2. The stirring device according to claim 1 , wherein the plate is rectangular or hexagonal.

3. The agitation device according to claim 1 , wherein the length of the plate member in a rotation direction of the agitation blade is longer than the length of the plate member in a direction perpendicular to the rotation direction.

4. The stirring device according to claim 1 , wherein the plate material is attached to the end surface by welding at a peripheral portion of the one main surface.

5. 5. The stirring device according to claim 4, wherein the plate material has a through hole penetrating between the one main surface and the other main surface, and the plate material is attached to the end surface by welding even at a peripheral portion of the through hole.

6. 2. The stirring device according to claim 1, wherein the distance between the other main surface of the plate and the casing is 5 mm to 50 mm.

7. The stirring device according to claim 1, wherein the plate has a corner portion having an angle of 60° to 135° facing the rotation direction of the stirring blade.

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