JP5616263B2 - Horizontal rotary dryer - Google Patents

Description

  The present invention relates to a horizontal rotary dryer, and more particularly to a horizontal rotary dryer in which heating tubes supported by a number of support members are arranged in a rotary dryer body.

  Conventionally, as a horizontal rotary dryer, for example, the one shown in FIG. 6 is known (Patent Document 1).

  The rotary dryer 100 has a cylindrical rotary dryer main body 101. The rotary dryer main body 101 has a supply port 102 for a material to be dried (for example, wet powder or granules) at one end (the left end in the drawing), and a discharge port for the material to be dried at the other end (the right end in the drawing). 103, and on two fulcrum rollers 105 that are arranged at two intervals in the axial direction via two tires 104 provided on the outer peripheral surface, the discharge port 103 is more than the supply port 102 side. It is placed horizontally so that it can be rotated with the side facing down.

  The rotary dryer main body 101 includes an annular large gear 106 between two tires 104, and the driving force of the electric motor 107 is transmitted through a pinion (not shown) that meshes with the large gear 106 to a predetermined speed. The to-be-dried object that has been rotated and received from the supply port 102 is brought into contact with a large number of heating pipes 108 arranged in the axial direction inside the rotary dryer main body 101, and the to-be-dried object is discharged to the discharge port 103. Drying is performed continuously by moving toward the surface.

  The heating pipes 108 arranged inside the rotary dryer main body 101 are arranged in an annular shape along the entire inner peripheral portion excluding the axial core portion of the rotary dryer main body 101, and are supported by a large number of support members 109U and 109L. Yes. The support members 109U and 109L are provided so as to protrude from the inner surface of the rotary dryer main body 101 toward the shaft core, and the rotary dryer is provided to the group of the support members 109U and the group of the support members 109U. The main body 101 includes a group of support members 109L that are spaced apart from each other in the circumferential direction by a predetermined interval in the axial direction.

  By the way, due to the recent demand for an increase in size, there has been a case in which the diameter of the rotary dryer main body 101 becomes 3600 mm or more, which causes the occurrence of fatigue cracks that may be caused by the deformation of the rotary dryer main body 101 during rotation. It has become to.

  That is, the base portions of the supporting members 109U and 109L supporting the heating tube 108 in the rotary dryer main body 101 (fixed portions with the inner surface of the rotary dryer main body 101), and the rotary dryer main body corresponding to this root portion A fatigue crack sometimes occurred on the wall surface 101. This is considered to be caused by the strain during rotation of the rotary dryer main body 101 being concentrated in the base portions of the support members 109U and 109L.

  In order to cope with this, in Patent Document 1, as shown in FIG. 7, the rotating ends of the rotary dryer main body 101 are deformed by connecting the protruding ends of the support members 109 </ b> U and 109 </ b> L via the rod-shaped body 110. I try to suppress it. According to this method, it has been confirmed that the stress concentration generated at the base portions of the support members 109U and 109L can be effectively suppressed even by the FEM analysis result.

  However, as a result of further studies by the inventors, in this method, depending on the type of the object to be dried and the dry state, the portion of the rod-shaped body 110 may become an obstacle to the movement of the object to be dried. In addition, since the rod-shaped body 110 is provided inside the rotary dryer main body, there is a problem that it cannot be applied to the existing rotary dryer main body.

  By providing a reinforcing ring over the entire circumferential direction on the inner peripheral surface or outer peripheral surface of the rotary dryer main body so as to pass through the mounting position of the support member or the vicinity thereof as a technique for dealing with the same problem of fatigue cracking, It is also known to reinforce the base portion of the support member (Patent Document 2).

  However, the configuration in which the reinforcing ring is provided on the inner peripheral surface of the rotary dryer main body has a problem that it cannot be applied to the existing rotary dryer main body as described above.

  On the other hand, the configuration in which the reinforcing ring is provided on the outer peripheral surface can be applied to the existing rotary dryer main body, and is considered effective for suppressing the occurrence of fatigue cracks at the base portion of the support member. According to the study, it was found that there are the following new problems.

  That is, the rotation of the rotary dryer main body can be roughly divided into axial deformation and cross-sectional deformation. As shown in FIG. 6, the axial deformation of the rotary dryer main body 101 is simply supported at two points with the portion of the tire 104 in the axial direction as a fulcrum. This occurs when the maximum bending moment is applied to the center between these fulcrums depending on the weight of the object to be dried.

  On the other hand, as shown in FIG. 7, the cross-sectional deformation is such that the rotary dryer main body 101 is supported at two points by two fulcrum rollers 105 at the site of the tire 104. When viewed in a cross section perpendicular to the cross section, the rotation occurs in a central portion between the two fulcrum rollers 105 in a distorted form instead of a circular form.

  The techniques of Patent Documents 1 and 2 both reinforce the protruding end of the support member or its base portion along the circumferential direction, and are for coping with cross-sectional deformation. Even when a reinforcing ring is provided on the outer peripheral surface of the rotary dryer main body as in Patent Document 2, the reinforcing ring is only provided in the circumferential direction of the rotary dryer main body, and therefore cannot cope with axial deformation at all. .

  Since the rotary dryer main body rotates about its axis, when viewed in the axial direction, a compressive stress is generated at the top and a tensile stress is generated at the bottom, so that the stress amplitude becomes large. For this reason, repeated axial deformation occurs during rotation of the rotary dryer main body, so that when the operation is performed for a long period of time, a reinforcing ring is provided at the junction between the support member and the inner surface of the rotary dryer main body. Even if this occurs, fatigue cracks may occur at the joint between the reinforcing ring and the inner surface of the main body of the rotary dryer.

JP 2009-243721 A JP 2006-57880 A

  As a result of intensive studies on the problem of the occurrence of such fatigue cracks, the present inventors have suppressed the occurrence of fatigue cracks at the base portion of the support member only by suppressing the axial deformation during rotation of the rotary dryer body. As a result, the inventors have found out that the present invention can be achieved.

  Therefore, the present invention can suppress the occurrence of fatigue cracks at the base portion of the support member that supports the heating tube in the rotary dryer body by suppressing axial deformation during rotation of the rotary dryer body. It is an object to provide a horizontal rotary dryer.

  The other subject of this invention becomes clear by the following description.

  The above problems are solved by the following inventions.

(Claim 1)
An object to be dried received from one end of the main body of the rotary dryer, in which a large number of heating tubes along the axial direction are supported by a number of support members protruding from the inner surface of the main body of the rotary dryer. A horizontal rotary dryer that is dried by the heat of the heating tube while rotating, and discharged from the other end,
A plurality of reinforcing members along the axial direction of the rotary dryer main body, and a buckling prevention member for preventing buckling of the reinforcing member on the outer peripheral surface of the rotary dryer main body,
The reinforcing member is provided at regular intervals in the circumferential direction of the rotary dryer body ,
The buckling prevention member is provided to connect the reinforcing members adjacent to each other in the circumferential direction of the rotary dryer main body so as to connect the surfaces arranged inside each other, and is spaced along the axial direction of the rotary dryer main body. The buckling prevention members between the reinforcing members adjacent to each other in the circumferential direction of the rotary dryer main body are arranged so as to be shifted in the axial direction of the rotary dryer main body . Horizontal rotary dryer characterized by.

(Claim 2)
The reinforcing member has an elongated flat plate extending in the axial direction of the main body of the rotary dryer, a structural material formed in a U-shaped cross section, a structural material formed in an H-shaped cross section, and a cross-shaped U-shaped cross section. The horizontal rotary dryer according to claim 1, wherein the horizontal rotary dryer is one of a formed structural material and a structural material formed in a cross-sectional O shape .

(Claim 3)
The buckling prevention member is a fan-shaped flat plate, a structural material formed in a U-shaped cross section, a structural material formed in a H-shaped cross section, a structural material formed in a cross-shaped cross section, or a cross-section. The horizontal rotary dryer according to claim 1 or 2 , wherein the horizontal rotary dryer is one of structural materials formed in an O shape .

(Claim 4 )
The buckling preventing member, the rotary dryer horizontal rotary dryer of claim 1, 2 or 3, wherein the spaced apart at a gap from the outer peripheral surface of the body.

  According to the present invention, the support for supporting the heating tube in the rotary dryer main body is achieved by a simple configuration that increases the rigidity of the rotary dryer main body by a plurality of reinforcing members along the axial direction and suppresses axial deformation during rotation. The occurrence of fatigue cracks at the base portion of the member can be suppressed.

  Further, since it is only necessary to provide a plurality of reinforcing members along the axial direction on the outer periphery of the rotary dryer main body, the present invention can be easily applied to an existing rotary dryer main body.

Side view showing an example of a horizontal rotary dryer according to the present invention (Ii)-(ii) sectional view taken on the line in FIG. Partial sectional view showing another example of a buckling prevention member Partial sectional view showing still another example of the buckling prevention member (A)-(d) is a fragmentary sectional view which shows the other example of a reinforcement member Side view showing a conventional horizontal rotary dryer (Vi)-(vi) line sectional view of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a side view showing an example of a horizontal rotary dryer according to the present invention, and FIG. 2 is a cross-sectional view taken along line (ii)-(ii) in FIG.

  The cylindrical rotary dryer main body 2 constituting the main part of the horizontal rotary dryer 1 is respectively spaced apart in the axial direction via two tires 3 provided on the outer peripheral surface as in FIG. It is rotatably mounted on the fulcrum rollers 4 arranged two by two. At one end of the rotary dryer main body 2 (left end in FIG. 1), a supply port 5 for introducing an object to be dried is continuously provided, and at the other end (right end in FIG. 1), A discharge port 6 for discharging the material to be dried is provided continuously. The rotary dryer main body 2 is horizontally placed on a fulcrum roller 4 arranged at an interval in the axial direction so that the discharge port 6 side is lower than the supply port 5 side.

  The two tires 3 are arranged at an interval in the axial direction of the rotary dryer main body 2, and in the meantime, the two tires 3 are annular so as to be close to one tire 3 (here, the tire 3 located on the discharge port 6 side). The large gear 7 is provided over the entire circumference of the rotary dryer main body 2. The large gear 7 meshes with a pinion (not shown) that rotates by driving of the electric motor 8, and rotates the rotary dryer main body 2 at a predetermined speed by driving of the electric motor 8. Thereby, the rotary drying main body 2 moves the to-be-dried material received from the supply port 5 toward the discharge port 6 while rotating.

  As shown in FIG. 2, the rotary dryer main body 2 includes a large number of heating tubes 21 extending in the axial direction therein. These heating tubes 21 are annularly arranged on the entire inner peripheral portion excluding the shaft core portion of the rotary dryer body 2, and a heating medium such as steam is supplied to the inside from the end side of the rotary dryer body 2. And dried by contact with the material to be dried received from the supply port 5. The heating tube 21 shown here is arranged at two equal intervals in the circumferential direction on two circumferences having different diameters when viewed in a cross section orthogonal to the axial direction of the rotary dryer main body 2. It is provided to be a layer.

  These heating tubes 21 are supported by the support members 22U and 22L by penetrating through a large number of support members 22U and 22L provided on the inner peripheral surface of the rotary dryer main body 2. Each support member 22U, 22L consists of a fan-shaped flat plate which protrudes toward the axial center part of the rotary dryer main body 2, is arrange | positioned along the circumferential direction of the rotary dryer main body 2, and several sheets (here 3) Are arranged at equal intervals in the circumferential direction.

  Here, the support members 22U and 22L are a set of three pieces installed in the circumferential direction, and the support member 22U on the upstream side (supply port 5 side) and the downstream side (discharge port 6 side) of the rotary dryer body 2 are combined. When viewed from the axial direction of the rotary dryer main body 2, the support member 22 </ b> L is arranged out of phase so as not to overlap each other. That is, as shown in FIG. 2, one support member 22U is provided at 120 ° intervals in the circumferential direction with the uppermost portion of the rotary dryer main body 2 as a base point, and the other support member 22L is provided in the rotary dryer main body 1. Are provided at intervals of 120 ° in the circumferential direction starting from the lowermost part, and a plurality of sets of support members 22U and 22L are set at a predetermined interval in the axial direction of the rotary dryer body 2 as a set. Members 22U and 22L are disposed and support the heating tube 21, respectively.

  These supporting members 22U and 22L are not limited to the fan-shaped members illustrated. For example, other shapes such as a bowl shape may be used, and the number of heating tubes 21 supported by a single support member 22U, 22L is not particularly limited, but the handling property and the arrangement of the heating tubes are taken into consideration. Then, the illustrated fan shape is preferable.

  Here, a reinforcing rib 23 which is an example of a reinforcing member of the present invention is provided on the outer peripheral surface of the rotary dryer main body 2. A plurality of the reinforcing ribs 23 are provided along the axial direction of the rotary dryer main body 2 and are provided at regular intervals in the circumferential direction. Each reinforcing rib 23 is formed of a long flat plate extending in the axial direction of the rotary dryer main body 2, and one side of the long side is welded to the outer peripheral surface of the rotary dryer main body 2, so that the radial shape extends from the outer peripheral surface. It is provided so as to protrude. Here, 16 reinforcing ribs 23 are provided at equal intervals in the circumferential direction, but the number thereof is not particularly limited, and is appropriately determined according to the diameter of the rotary dryer main body 2.

  The range in which the reinforcing ribs 23 are provided is provided over a range in which the stress amplitude due to axial deformation becomes the largest when the rotary dryer body 2 rotates. For example, as shown in FIG. 1, tires 3 are arranged at intervals in the axial direction of the rotary dryer main body 2, and the two tires 3 each have two fulcrum rollers 4 as fulcrums. Is supported at two points, the stress amplitude due to axial deformation during rotation is the largest between the tires 3, so that the range between the two tires 3 includes the center between the tires 3. What is necessary is just to be provided over.

  Here, since the large gear 7 is provided so as to be close to the tire 3 on the downstream side, the reinforcing rib 23 is provided between the tire 3 on the upstream side and the large gear 7. The axial deformation stress acting on the ribs 23 is provided at an interval of, for example, 300 mm to 500 mm from the upstream tire 3 and the large gear 7 so as not to reach the upstream tire 3 and the large gear 7. ing.

  The rotary dryer body 2 is provided with the plurality of reinforcing ribs 23 along the axial direction as described above, so that the rigidity in the axial direction is enhanced, and as a result, axial deformation during rotation is suppressed. For this reason, it is possible to avoid stress concentration at the joint portion between the support members 22U and 22L and the inner surface of the rotary dryer body 2 when the rotary dryer body 2 is rotated, and the occurrence of fatigue cracks at the joint portion or in the vicinity thereof. Is suppressed.

  According to the experiment of the present inventor, as shown in FIG. 1, the rotation dryer main body 2 having an interval of 21000 mm between the upstream tire 3 and the large gear 7, a plate thickness of 16 mm, and a diameter (outer diameter) of 3600 mm is attached to the tire. 16 reinforcing ribs 23 made of SUS having a height of 120 mm and a thickness of 12 mm are spaced apart from the tire 3 and the large gear 7 by 500 mm between the tire 3 and the large gear 7 so as to be equally spaced in the circumferential direction. The radial moment is improved by 30%, the generated stress can be reduced by 30%, and the stress concentration at the joint between the rotary dryer main body 2 and the supporting members 22U and 22L is reduced. It was confirmed that

  In order to increase the rigidity of the rotary dryer main body 2, a method of increasing the thickness of the rotary dryer main body 2 can be considered. However, the overall weight of the rotary dryer main body 2 is increased, and the structure must be reinforced to support it. As a whole, there is a problem that the cost becomes high. However, according to the present invention, it is only necessary to add a plurality of reinforcing members (reinforcing ribs 23) along the axial direction on the outer peripheral surface of the rotary dryer main body 2, so that the total weight increases. There is an advantage that it can be suppressed and the cost is low, and it can be easily applied to an existing rotary dryer main body.

  In the present invention, it is possible to suppress the axial deformation at the time of rotation of the rotary dryer body 2 just by providing a plurality of reinforcing ribs 23 along the axial direction in this way, it is possible to suppress the occurrence of fatigue cracks, In order to prevent the reinforcing ribs 23 from buckling due to the cross-sectional deformation that repeatedly acts on the rotary dryer main body 2 during rotation, the reinforcing ribs 23 adjacent in the circumferential direction of the rotary dryer main body 2 as shown in FIGS. It is preferable to further provide a buckling prevention member along the circumferential direction of the rotary dryer main body 2 so as to connect each other.

  Here, a buckling prevention rib 24 which is an example of a buckling prevention member is formed over the entire circumference of the rotary dryer main body 2. That is, the buckling prevention ribs 24 are provided between the reinforcing ribs 23 adjacent to each other along the circumferential direction of the rotary dryer body 2.

  The buckling prevention rib 24 is made of a fan-shaped flat plate having the same thickness as the reinforcing rib 23, protrudes from the outer peripheral surface of the rotary dryer main body 2, and is arranged along the circumferential direction of the rotary dryer main body 2. The reinforcing ribs 23 and the outer peripheral surface of the rotary dryer main body 2 are welded to the reinforcing ribs 23 and the rotary dryer main body 2 so as to bridge and integrally connect the reinforcing ribs 23 adjacent to each other in the circumferential direction.

  The reinforcing ribs 23 adjacent in the circumferential direction are reinforced by the buckling prevention ribs 24 so that the distance between the reinforcing ribs 23 is constant, and the reinforcing ribs 23 are tilted along the circumferential direction of the rotary dryer body 2 and are seated. It is prevented from bending. In addition, since the buckling prevention rib 24 is provided, the cross-sectional deformation that acts when the rotary dryer main body 2 rotates is also suppressed, so that the rigidity of the rotary dryer main body 2 can be further improved.

  As shown in FIG. 1, a plurality of such buckling prevention ribs 24 are provided at predetermined intervals along the axial direction of the rotary dryer main body 2. This is preferable because buckling of the reinforcing rib 23 can be prevented and the rigidity of the rotary dryer main body 2 can be further improved.

  In the present invention, the buckling prevention rib 24 as an example of the buckling prevention member is a base portion of the support members 22U and 22L that protrude from the inner surface of the rotary dryer main body 2 like a conventional reinforcing ring (Patent Document 2). The purpose is not to reinforce the ribs but to prevent buckling of the reinforcing ribs 23 along the axial direction of the rotary dryer body 2. When the conventional reinforcing ring is provided on the outer peripheral surface of the rotary dryer main body, it is necessary to provide it in accordance with the arrangement position of the support member that cannot be seen in the inside, and therefore, particularly when applied to the existing rotary dryer main body, etc. However, according to the present invention, even when applied to an existing rotary dryer main body, the positioning work is provided regardless of the positions of the internal support members 22U and 22L. It is possible, and the conventional difficult work is not required.

  Similarly, since the buckling prevention rib 24 is intended to prevent buckling of the reinforcing rib 23, the buckling prevention rib 24 may be provided so as to connect the reinforcing ribs 23 adjacent to each other in the circumferential direction of the rotary dryer body 2, and is not necessarily rotated. It may not be fixed to the outer peripheral surface of the dryer body 2. Therefore, as shown in FIG. 3, the buckling prevention rib 24 can be provided so as to be separated from the outer peripheral surface of the rotary dryer main body 2 with a gap S therebetween. Even in this case, the function of maintaining a constant spacing between the reinforcing ribs 23 adjacent to each other in the circumferential direction of the rotary dryer main body 2 can be achieved, and the reinforcing ribs 23 can be prevented from buckling. The effect which raises the rigidity with respect to cross-sectional deformation | transformation of the rotary dryer main body 2 is acquired.

  The buckling prevention rib 24 shown in FIGS. 1 and 2 is formed over the entire circumference of the rotary dryer main body 2, and prevents buckling of the reinforcing rib 23 over the entire circumference of the rotary dryer main body 2. However, the buckling prevention ribs 24 may be connected so as to keep the reinforcing ribs 24 adjacent to each other in the circumferential direction of the rotary dryer main body 2 at a constant interval. Therefore, for example, as shown in FIG. 4, the buckling prevention ribs 24 may be provided so as to be discontinuous along the circumferential direction of the rotary dryer body 2.

  That is, the plurality of buckling prevention ribs 24 provided at predetermined intervals in the axial direction of the rotary dryer main body 2 between the two reinforcing ribs 23 are provided between the adjacent reinforcing ribs 23. Are not disposed at the same position in the circumferential direction of the rotary dryer, but are shifted in the axial direction of the rotary dryer body 2. Accordingly, the buckling prevention ribs 24 between the reinforcing ribs 23 are arranged in a zigzag shape when viewed in the axial direction of the rotary dryer body 2.

  Even in such an embodiment, the buckling prevention rib 24 exhibits a function of maintaining a constant interval between the reinforcing ribs 23 adjacent to each other in the circumferential direction of the rotary dryer main body 2, and prevents the buckling of the reinforcing rib 23. In addition, the effect of increasing the rigidity of the rotary dryer main body 2 through these reinforcing ribs 23 can be obtained.

  Furthermore, also in the aspect of the buckling prevention rib 24 shown in FIG. 4, it may be separated from the outer peripheral surface of the rotary dryer main body 2 with a gap S as in FIG.

  In the above description, the reinforcing rib 23 made of a long flat plate is exemplified as the reinforcing member in the present invention. However, the reinforcing member in the present invention is not limited to such a rib-shaped reinforcing member, but is illustrated in FIG. As described above, reinforcing members having various cross-sectional shapes can be used.

  FIG. 5A shows an example in which a reinforcing member 25 made of a structural material having a U-shaped cross section is used.

  FIG. 5B shows an example in which a reinforcing member 26 made of a structural material having an H-shaped cross section is used.

  FIG.5 (c) is an example using the reinforcement member 27 which consists of a structural material formed in the cross-sectional shape of a cross-section.

  FIG. 5D shows an example in which a reinforcing member 28 made of a structural material having a cross-sectional O shape is used. The reinforcing member 28 has a hollow shape but may be a solid rod-shaped body.

  Each of the reinforcing members 25 to 28 shown in FIG. 5 is unlikely to be tilted along the circumferential direction of the rotary dryer main body 2 unlike the reinforcing rib 23, and can prevent buckling to some extent only by its structure. However, providing such a reinforcing member 25 to 28 with a buckling prevention member along the circumferential direction of the rotary dryer main body 2 reinforces the reinforcing members 25 to 28 and via the reinforcing members 25 to 28. This is preferable because an effect of increasing the rigidity against cross-sectional deformation of the rotary dryer body 2 can be obtained.

  In addition, in each aspect shown in FIGS. 1-5, although the buckling prevention rib 24 is used as a buckling prevention member, the buckling prevention member in this invention is also restricted to such a rib-shaped buckling prevention member. Absent. For example, you may use the buckling prevention member which consists of a structure which has the cross-sectional structure similar to the reinforcement members 25-28 each shown to Fig.5 (a)-(d).

  The buckling prevention rib 24 shown in FIGS. 5A to 5D may also be separated from the outer peripheral surface of the rotary dryer main body 2 with a gap S, as in FIG. In addition, when using a buckling prevention member made of a structure having a cross-sectional structure similar to that of the reinforcing members 25 to 28 shown in FIGS. A gap S may be provided between the main body 2 and the outer peripheral surface.

  Further, in the case of using a buckling prevention member made of a structure having a cross-sectional structure similar to that of the reinforcing members 25 to 28 shown in FIGS. 5A to 5D, the buckling prevention member similarly to FIG. May be provided so as to be discontinuous along the circumferential direction of the rotary dryer body 2.

1: Horizontal rotary dryer 2: Rotary dryer main body 21: Heating tube 22U, 22L: Support member 23: Reinforcement rib (reinforcement member)
24: Buckling prevention rib 25-28: Reinforcing member 3: Tire 4: Support roller 5: Supply port 6: Discharge port 7: Large gear 8: Electric motor S: Gap

Claims (4)

An object to be dried received from one end of the main body of the rotary dryer, in which a large number of heating tubes along the axial direction are supported by a number of support members protruding from the inner surface of the main body of the rotary dryer. A horizontal rotary dryer that is dried by the heat of the heating tube while rotating, and discharged from the other end,
A plurality of reinforcing members along the axial direction of the rotary dryer main body, and a buckling prevention member for preventing buckling of the reinforcing member on the outer peripheral surface of the rotary dryer main body,
The reinforcing member is provided at regular intervals in the circumferential direction of the rotary dryer body ,
The buckling prevention member is provided to connect the reinforcing members adjacent to each other in the circumferential direction of the rotary dryer main body so as to connect the surfaces arranged inside each other, and is spaced along the axial direction of the rotary dryer main body. The buckling prevention members between the reinforcing members adjacent to each other in the circumferential direction of the rotary dryer main body are arranged so as to be shifted in the axial direction of the rotary dryer main body . Horizontal rotary dryer characterized by. The reinforcing member has an elongated flat plate extending in the axial direction of the main body of the rotary dryer, a structural material formed in a U-shaped cross section, a structural material formed in an H-shaped cross section, and a cross-shaped U-shaped cross section. The horizontal rotary dryer according to claim 1, wherein the horizontal rotary dryer is one of a formed structural material and a structural material formed in a cross-sectional O shape . The buckling prevention member is a fan-shaped flat plate, a structural material formed in a U-shaped cross section, a structural material formed in a H-shaped cross section, a structural material formed in a cross-shaped cross section, or a cross-section. The horizontal rotary dryer according to claim 1 or 2 , wherein the horizontal rotary dryer is one of structural materials formed in an O shape . The buckling preventing member, the rotary dryer horizontal rotary dryer of claim 1, 2 or 3, wherein the spaced apart at a gap from the outer peripheral surface of the body.

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