Horizontal-type rotary dryer

Abstract

[PROBLEM] To provide a horizontal-type rotary dryer with which it is possible to regulate the filling rate of to-be-treated objects in a rotary cylinder. [SOLUTION] This horizontal-type rotary dryer 1 for resolving the problem is characterized by including: a rotary cylinder 10 that has a supply port 41 for supplying to-be-treated objects W on one end side ITS and a discharge port 50 for discharging the to-be-treated objects W on the other end side OTS, and is rotatable in the circumferential direction; a discharge pipe 51 connected to the discharge port 50 and provided at a center part of the other end side of the rotary cylinder 10; and a first scraping member 60 positioned at the other end side OTS of the rotary cylinder 10, rotating in the circumferential direction of the rotary cylinder 10, scraping up the to-be-treated objects W deposited in a lower part of the other end side OTS of the rotary cylinder 10, and guiding the to-be-treated objects W to the inside of the discharge pipe 51. The first scraping member is a variable scraping member with which it is possible to change the surface area of the front surface of the first scraping member with respect to the rotation direction of the first scraping member 60.

Description

Horizontal rotary dryer

[0001] The present invention relates to a horizontal rotary dryer that heats and dries materials to be treated, and more particularly to a discharge mechanism for materials to be treated that is provided on the discharge side of a rotary drum of the horizontal rotary dryer.

[0002] In conventional horizontal rotary dryers, a dam plate is provided inside the rotating drum, and the dam plate ensures a desired filling rate and drying performance of the material to be treated.

[0003] In addition to the configuration in which a dam plate is provided inside the rotating cylinder, there are also configurations having mechanisms such as those described in Patent Documents 1 to 5 below.

[0004] The rotary drum dryer of Patent Document 1 includes a rotary drum and an agitator blade installed longitudinally within the rotary drum. The tip of the blade is positioned so that it passes at a height of at least two-thirds of the height of the outlet weir at the terminal end of the rotary drum, and at least at the bottom of the rotary drum, passes at a height of at most three-thirds of the height of the outlet weir in the direction of rotation and transfer of trapped debris. The lifter installed on the inner surface of the rotary drum is also characterized by a height of at most one-third of the height of the outlet weir at the terminal end of the rotary drum, a pointed top, and a front and rear sloped flared toward the inner surface of the rotary drum. This rotary drum dryer is said to prevent the accumulation of debris on the inner surface of the rotary drum, not impede the flow of debris from the input side to the output side, and prevent a decrease in debris retention and a decrease in processing capacity.

[0005] The drum dryer in Patent Document 2 is a drum dryer in which materials to be dried are loaded into the inlet side at one end of the rotating drum, dried with hot air as the rotating drum rotates, and discharged to the outlet side at the other end, and is characterized by the provision of multiple lifters on the inner surface of the outlet side of the rotating drum, each consisting of a single inclined blade that sends the materials to be dried back toward the inlet when the rotating drum rotates forward and sends them toward the outlet when the rotating drum rotates reversely.This drum dryer is said to make it possible to improve drying efficiency during forward rotation in a drum dryer in which materials to be dried can be discharged by rotating the rotating drum in reverse.

[0006] The horizontal rotary dryer of Patent Document 3 is characterized by the fact that it has a dried material removal section formed in a cylindrical main body, a relay chamber provided adjacent to the dried material removal section, and a discharge chamber adjacent to the relay chamber, which are connected to each other, and a scraping device for the dried material is provided on the circumferential surface of an axial tube extending from the dried material removal section to the relay chamber, and the scraping device is configured to operate as the main body rotates. With this horizontal rotary dryer, when the upper surface of the dried material in the discharge chamber rises and exceeds the angle of repose of the dried material, it flows back into the relay chamber and is scraped back into the main body by a screw formed on the axial tube that rotates with the main body, preventing the dried material from being strongly pressed into the discharge chamber and forming clumps.

[0007] In the method for removing contents from a rotary kiln described in Patent Document 4, an input pipe and an output pipe are provided at both ends of the center of the kiln, each equipped with a bearing, and a sprocket attached to one end. The bearing is then set on a frame, and a reducer with a sprocket is quickly connected to the kiln sprocket with a roller chain. The reducer has a variable rotation direction. This method is said to be convenient because, when removing contents from a batch-type rotary kiln, it is only necessary to operate a switch to rotate the kiln in the direction of removal.

[0008] The rotary heat treatment furnace of Patent Document 5 is characterized by a cylindrical heating drum and a furnace body integrally formed with an inlet tube and a discharge tube, each having screw blades fixed to both ends of its central axis, rotatably installed so that the heating drum portion is housed inside an insulated muffle equipped with a heat generating means at the bottom, and the ends of the inlet tube and the discharge tube are connected to a raw material supply section and a treated product discharge section by a sealing sliding seal mechanism. This rotary heat treatment furnace is characterized by a mechanism in which screw blades for supplying and discharging powder and granular material are fixed inside the inlet tube and the discharge tube, which serve as the rotation axis of the heating drum, allowing for smooth powder and granular material transport by utilizing the rotation of the furnace body itself, and also enabling the construction of an airtight furnace structure.

[0009] Japanese Patent Laid-Open No. 09-310978 Japanese Patent Laid-Open No. 2001-272166 Japanese Patent Laid-Open No. 2007-263481 Japanese Patent Laid-Open No. 09-166382 Japanese Utility Model Laid-Open No. 07-002889

[0010] In conventional horizontal rotary dryers, in which the materials to be treated are heated and dried as they move from one end to the other inside the rotating cylinder, if the materials have high fluidity, even if a hollow, disc-shaped dam plate is provided inside the rotating cylinder along the cross section of the rotating cylinder so as to contact the inner peripheral wall of the rotating cylinder in order to increase the packing rate of the materials at one end of the rotating cylinder, the materials may easily pass through the hollow portion in the center of the dam plate and move to the other end.As a result, the packing rate of the materials at the one end side of the dam plate is not sufficient, which leads to a problem of reduced drying performance for the materials.

[0011] In the aforementioned Patent Document 1, vanes are provided inside the rotating drum to reduce the amount of retained dust scraped off and stabilize the flow of the dust toward the discharge side. These vanes stabilize the flow of dust, but do not adjust the filling rate of retained dust inside the rotating drum.

[0012] In the above-mentioned Patent Document 2, an annular dam plate is provided on the end face of the outlet side of the rotating drum, and a notch and a guide blade are provided in part of the annular dam plate to adjust the residence time of the materials to be dried. However, according to the drawings in this Patent Document 2, the guide blade is merely a plate member extending obliquely inward from one side of the notch, and therefore does not have the function of appropriately adjusting the filling rate of the materials to be dried inside the rotating drum.

[0013] Furthermore, although the above-mentioned prior patent documents 3 to 5 disclose various mechanisms for discharging the materials to be treated from the rotating cylinder, none of them can adjust the filling rate of the materials to be treated in the rotating cylinder.

[0014] Therefore, a main object of the present invention is to provide a horizontal rotary dryer that can appropriately adjust the filling rate of the material to be treated inside the rotary drum.

[0015] The present invention, which has solved the above-mentioned problems, is as follows: (First Aspect) A horizontal rotary dryer comprising: a rotating shell having a supply port for materials to be treated at one end and a discharge port for the materials to be treated at the other end and rotatable in a circumferential direction, a discharge pipe connected to the discharge port provided in the center of the other end of the rotating shell, and a first scraping-up member located at the other end of the rotating shell, rotating in the circumferential direction of the rotating shell, and scraping up the materials to be treated accumulated at the lower part of the other end of the rotating shell and guiding them into the discharge pipe, wherein the first scraping-up member is an adjustable scraping-up member whose front surface area in the direction of rotation of the first scraping-up member can be changed.

[0016] In the horizontal rotary dryer of this aspect, the first scraping member scrapes up the materials accumulated at the lower end of the rotating shell, and the scraped-up materials are guided into the discharge pipe. In this horizontal rotary dryer, the front area of ​​the first scraping member in the direction of rotation can be changed, so that the amount of materials scraped up by the first scraping member can be adjusted, and as a result, the filling rate of the materials inside the rotating shell can be appropriately adjusted.

[0017] (Second Aspect) The horizontal rotary dryer is the horizontal rotary dryer of the first aspect, which has a number of heating pipes inside the rotating cylinder through which a heating medium passes, and is a dryer in which the material to be treated is brought into contact with outer surfaces of the heating pipes while the material to be treated moves from one end side to the other end side of the rotating cylinder, thereby indirectly heating and drying the material to be treated.

[0018] (Operation and Effect) The horizontal rotary dryer of the second embodiment is an indirect heating horizontal rotary dryer. This indirect heating horizontal rotary dryer is a dryer known as a steam tube dryer or the like. In this indirect heating horizontal rotary dryer, it is important to control the contact rate between the multiple heating tubes and the workpieces to achieve a desired moisture content for the workpieces discharged from the rotating shell. A factor that contributes to this contact rate is the filling rate of the workpieces in the rotating shell. In an indirect heating horizontal rotary dryer, adjusting the filling rate of the workpieces in the rotating shell is important. However, because the front surface area of ​​the first scraping member relative to the direction of rotation can be changed, this filling rate of the workpieces can be easily adjusted.

[0019] (Third Aspect) The horizontal rotary dryer of the first or second aspect, wherein a through hole is formed in a part of the first scraping member, and the first scraping member is provided with an opening / closing door that can cover the through hole.

[0020] (Effect) When the opening and closing door is in the open state, when the first scraping member is rotated, the material to be processed placed on the front surface of the first scraping member in the direction of rotation falls out of the through hole of the first scraping member.

[0021] Conversely, when the opening and closing door is in the closed position, when the first scraping member is rotated, the material to be processed placed on the front surface of the first scraping member in the direction of rotation can be prevented from falling out of the through hole of the first scraping member.

[0022] As described above, the amount of material scraped up can be changed by opening and closing the door, so that the filling rate of the material in the rotating cylinder can be adjusted.

[0023] (Fourth Aspect) The horizontal rotary dryer according to the third aspect, wherein the opening and closing door is a hinged door that opens to at least one of the front and rear sides in the rotation direction of the first scraping member.

[0024] (Operation and Effect) A hinged door that opens to at least one of the front and rear sides in the rotation direction of the first scraping member can be used as the opening and closing door. This hinged door can achieve the operation and effect of the third aspect.

[0025] (Fifth aspect) A horizontal rotary dryer according to the third or fourth aspect, wherein the first scraper member is provided between the outer wall of the discharge pipe and the inner wall of the rotating cylinder, and extends from the inside to the outside of the rotating cylinder in a cross section intersecting the axis of the rotating cylinder, the inner part of the first scraper member is located further rearward than the outer part of the first scraper member in the direction of rotation of the first scraper member, and an intermediate part connecting the inner part of the first scraper member and the outer part of the first scraper member extends from the rear to the front in the direction of rotation of the first scraper member.

[0026] (Operation and Effect) The horizontal rotary dryer of the fifth aspect is characterized by the shape of the first scraping member, which extends from the inside to the outside of the rotating shell in a cross section intersecting the axis of the rotating shell. Specifically, the inner portion of the first scraping member is located further rearward than the outer portion of the first scraping member in the direction of rotation of the first scraping member, and the middle portion connecting the inner and outer portions of the first scraping member extends from the rear to the front in the direction of rotation of the first scraping member. By shaping the first scraping member in this way, the materials scraped up by the first scraping member can be temporarily accumulated in a recess formed by the inner and middle portions of the first scraping member, making it easier to discharge the scraped materials into the discharge pipe.

[0027] (Sixth Aspect) The horizontal rotary dryer according to any one of the first to fifth aspects, wherein the first scraping member has a side wall on at least one of a supply port side and a discharge port side of the material to be treated.

[0028] (Effects) It is preferable to provide a sidewall on at least one of the supply inlet side and discharge outlet side of the first scraping member for the material to be treated. If a sidewall is provided on the supply inlet side, when the material to be treated is scraped up by the first scraping member, the scraped material is less likely to fall out of the supply inlet side. Therefore, compared to when a sidewall is not provided on the supply inlet side, it is easier to discharge the material scraped up by the first scraping member into the discharge pipe.

[0029] Similarly, when a side wall is provided on the discharge outlet side, the scraped-up material is less likely to spill out from the discharge outlet side, making it easier to discharge the scraped-up material by the first scraping member into the discharge pipe compared to when no side wall is provided on the discharge outlet side.

[0030] From the viewpoint of facilitating the discharge of the material scraped up by the first scraping member into the discharge pipe, it is preferable to provide side walls on both the supply port side and the discharge port side of the material scraped up by the first scraping member.

[0031] (Seventh Aspect) The horizontal rotary dryer of the first or second aspect, wherein the first scraping member has an inner scraping blade that is provided between the outer wall of the discharge pipe and the inner wall of the rotating shell and extends from the inside to the outside of the rotating shell in a cross section that intersects with the axis of the rotating shell, and an outer scraping blade that is provided next to the inner scraping blade and can move outward relative to the inner scraping blade, and the extension length of the first scraping member can be changed by moving the outer scraping blade inward or outward.

[0032] (Operation and Effect) In the horizontal rotary dryer of this aspect, when the materials accumulated at the bottom of the rotating shell exceed a predetermined height, the materials at the height exceeding the predetermined height are scraped off by the first scraping member and poured into the discharge pipe. This aspect has the advantage that the predetermined height, i.e., the boundary line that determines whether or not the materials will be scraped off, can be easily changed by changing the extension length of the first scraping member. Furthermore, because the materials at the height exceeding the predetermined height are scraped off by the first scraping member, there is also the advantage that the filling rate of the materials can be more easily adjusted by adjusting the amount of materials scraped up inside the rotating shell.

[0033] (Eighth Aspect) The first scraping member is provided between the outer wall of the discharge pipe and the inner wall of the rotating shell, and has a fixed blade whose base end is fixed directly or indirectly to the circumferential wall of the discharge pipe and extends from the inside to the outside of the rotating shell in a cross section that intersects with the axis of the rotating shell, and a plurality of rotating blades that are provided outward of the fixed blade and can be connected to the tip ends of the fixed blades; and the horizontal rotary dryer has a rotating member having a rotating shaft that extends from the inside to the outside of the rotating shell in a cross section that intersects with the axis of the rotating shell, and the plurality of rotating blades have different lengths that extend outward of the rotating shell in the cross section that intersects with the axis of the rotating shell, are fixed to the rotating member, and rotate in the circumferential direction of the rotating shaft as the rotating member rotates, and it is possible to change the rotating blade that is connected to the fixed blade by rotating the rotating member.

[0034] (Operation and Effect) In this embodiment, as in the horizontal rotary dryer of the third embodiment, the first scraping member scrapes off the material piled up at the bottom of the rotating drum that exceeds a predetermined height and pours it into the discharge pipe. In this embodiment, the scraping amount of the material can be adjusted by changing the rotating blades connected to the fixed blades. Therefore, the first scraping member of this embodiment can easily adjust the filling rate of the material.

[0035] (Aspect 9) A horizontal rotary dryer according to aspect 1 or 2, wherein the base end of the first scraper member is directly or indirectly attached to the peripheral wall of the discharge pipe, the first scraper member extends from the inside to the outside of the rotating shell in a cross section that intersects with the axis of the rotating shell, other first scraper members having different lengths extending outward from the rotating shell in a cross section that intersects with the axis of the rotating shell are prepared in advance, and the first scraper member is replaceably attached to the peripheral wall of the discharge pipe.

[0036] (Effects) By replacing the first scraping member attached directly or indirectly to the peripheral wall of the discharge pipe with a first scraping member of a different length, the scraping amount of the material can be changed. With the horizontal rotary dryer of this aspect, which allows the replacement of the first scraping member, the filling rate of the material can be easily adjusted.

[0037] (Tenth Aspect) A horizontal rotary dryer according to the first or second aspect, wherein the base end of the first scraping member is directly or indirectly attached to the peripheral wall of the discharge pipe, and extends from the inside to the outside of the rotating shell in a cross section that intersects with the axis of the rotating shell, and an extension member can be attached to the tip of the first scraping member to extend the outward extension length of the rotating shell in the cross section that intersects with the axis of the rotating shell.

[0038] (Effects) By attaching an extension member to the tip of the first scraping member, which extends the length of the first scraping member outward from the rotating cylinder in a cross section that intersects with the axis of the rotating cylinder, the amount of material scraped up can be changed. With this horizontal rotary dryer in which an extension member can be attached to the tip of the first scraping member, the filling rate of the material can be easily adjusted.

[0039] (Eleventh Aspect) The horizontal rotary dryer according to any one of the first, second, fifth, seventh, eighth, ninth, and tenth aspects, wherein the first scraping member extends radially outward from an outer wall of the discharge pipe.

[0040] (Effects) For example, when the first scraper member is to be extended close to the inner wall of the rotating barrel, extending the first scraper member in the radial direction of the rotating barrel minimizes the extension length of the first scraper member. In other words, if the extension direction of the first scraper member is inclined relative to the radial direction of the rotating barrel, the extension length of the first scraper member must be longer than when the first scraper member extends in the radial direction of the rotating barrel. This can result in disadvantages such as requiring more power to rotate the first scraper member and increasing the material costs of the first scraper member. By extending the first scraper member in the radial direction of the rotating barrel, these disadvantages can be prevented.

[0041] (12th aspect) The horizontal rotary dryer of any one of the first to 11th aspects, further comprising: a second scraping-up member located on the other end side of the rotating shell, rotating in the circumferential direction of the rotating shell, scraping up the material to be treated accumulated on the bottom of the other end side of the rotating shell, and guiding it into the discharge pipe; a through hole formed in a part of the second scraping-up member; and a retractable door that can cover the through hole provided in the second scraping-up member.

[0042] (Operation and Effect) In the twelfth aspect, a second scraping member is further provided in addition to the first scraping member.

[0043] When the opening / closing door is in the open state, when the second scraping member is rotated, the material to be processed placed on the front surface of the second scraping member in the rotation direction falls out of the through hole of the second scraping member.

[0044] Conversely, when the opening and closing door is in the closed state, when the second scraping member is rotated, the material to be processed placed on the front surface of the second scraping member in the direction of rotation can be prevented from falling out of the through hole of the second scraping member.

[0045] As described above, the opening and closing of the opening and closing door can be used to scrape up or not scrape up the material to be treated, so by using the first scraping member, the filling rate of the material to be treated can be easily adjusted, and the material to be treated that has accumulated at the bottom of the other end of the rotating cylinder can be scraped up by the second scraping member and easily removed from inside the rotating cylinder.

[0046] (13th Aspect) The horizontal rotary dryer according to the 12th aspect, wherein the opening and closing door is a sliding door that is movable inward and outward of the rotary cylinder in a cross section that intersects with the axis of the rotary cylinder.

[0047] (Operation and Effect) As the opening and closing door, a sliding door that moves inward and outward of the rotating cylinder in a cross section that intersects with the axis of the rotating cylinder can be used. This sliding door can achieve the operation and effect of the twelfth aspect.

[0048] (14th Aspect) The horizontal rotary dryer according to the 12th aspect, wherein the opening and closing door is a hinged door that opens to at least one of the front and rear sides in a rotation direction of the second scraping member fixed to the discharge pipe.

[0049] (Operation and Effect) A hinged door that opens to at least one of the front and rear sides in the rotation direction of the second scraping member can be used as the opening and closing door. This hinged door can achieve the operation and effect of the twelfth aspect.

[0050] According to the present invention, it is possible to provide a horizontal rotary dryer in which the filling rate of materials to be treated inside the rotary drum can be adjusted.

[0051] 10 is a side view of a horizontal rotary dryer according to the present invention; FIG. 11 is a cross-sectional view of the other end of a horizontal rotary dryer according to the present invention as seen from the side; FIG. 12 is a cross-sectional view of the other end of a horizontal rotary dryer according to the present invention as seen from one end; FIG. 13 is a view showing a state in which a first scraper member is extended further than in FIG. 3; FIG. 14 is a perspective view showing the first scraper member and its peripheral area; FIG. 14 is a view showing a state in which the first scraper member is retracted further than in FIG. 5; FIG. 15 is a side view showing the first scraper member and its peripheral area; FIG. 16 is a view showing a state in which the first scraper member is retracted further than in FIG. 7; FIG. 17 is a perspective view showing the first scraper member and its peripheral area according to the second embodiment; FIG. 18 is a view showing a state in which the rotation control rod is rotated from the state of FIG. 9; FIG. 19 is a view showing a state in which the rotation control rod is further rotated from the state of FIG. 10; FIG. 19 is a perspective view of the state of FIG. 9 as seen from a different angle (outside the rotating cylinder); FIG. 19 is a perspective view showing the first scraper member and its peripheral area according to the third embodiment; FIG. 13 is a perspective view showing a state in which a different first scraper member is attached; FIG. 19 is a perspective view showing the first scraper member and its peripheral area according to the fourth embodiment; FIG. 19 is a perspective view showing a state in which an extension member is attached from FIG. 15. 24. A perspective view showing a state in which another extension member is attached from the state of FIG. 15. A side view of FIG. 15. A side view of FIG. 16. A side view of FIG. 17. A perspective view showing a second scraping member and its periphery according to the fifth embodiment. A perspective view showing a state in which the opening and closing door is opened from the state of FIG. 21. A perspective view showing a second scraping member and its periphery according to the sixth embodiment. A perspective view showing a state in which the opening and closing door is opened from the state of FIG. 23. A perspective view showing a state in which the opening and closing door is further opened from the state of FIG. 24. A perspective view showing a first scraping member and its periphery according to the seventh embodiment. A perspective view showing a state in which the opening and closing door is opened from the state of FIG. 26. A perspective view showing a state in which the opening and closing door is further opened from the state of FIG. 27. A cross-sectional view of the other end of the horizontal rotary dryer according to the seventh embodiment, as seen from one end side.

[0052] A preferred embodiment of the present invention will be described below with reference to the drawings. Note that the following description and drawings merely illustrate one embodiment of the present invention, and the contents of the present invention should not be interpreted as being limited to this embodiment.

[0053] In the following description, in an intersecting cross section intersecting the axis of the rotating shell 10, the direction approaching the axis of the rotating shell 10 is referred to as the inner side BS, base end side BS, or inner side BS, and the direction moving away from the axis of the rotating shell 10 is referred to as the outer side TS, tip end side TS, or outer side TS. Also, in an intersecting cross section intersecting the axis of the rotating shell 10, the direction intersecting the axis of the rotating shell 10 is referred to as the radial direction RD.

[0054] In the following description, the axis SL of the rotating shell 10 is the rotation axis of the rotating shell 10, and is a line connecting the center of the top surface and the center of the bottom surface of the rotating shell 10. For example, in the case of the rotating shell 10 shown in Figure 1, since the rotating shell 10 is in a horizontal position, the left side LL of the ITS on one end of the rotating shell 10 can be considered to be the top surface, and the right side RL of the OTS on the other end of the rotating shell 10 can be considered to be the bottom surface. Conversely, the left side LL of the ITS on one end of the rotating shell 10 can also be considered to be the bottom surface, and the right side RL of the OTS on the other end of the rotating shell 10 can also be considered to be the top surface.

[0055] In the following description, the terms "longitudinal section of the rotating shell 10," "transverse section of the rotating shell 10," and "intersecting section intersecting with the axis SL of the rotating shell 10" are as follows: "longitudinal section of the rotating shell 10" refers to a cross section obtained when the rotating shell 10 is cut vertically along its axis SL. "Longitudinal sections of the first scraper member and the second scraper member" refer to cross sections obtained when the first scraper member and the second scraper member are cut vertically in the same direction as the longitudinal section of the rotating shell 10. "Transverse section of the rotating shell 10" refers to a cross section obtained when the rotating shell 10 is cut along a plane perpendicular to its axis SL. "Transverse sections of the first scraper member and the second scraper member" refer to cross sections obtained when the first scraper member and the second scraper member are cut in the same direction as the transverse section of the rotating shell 10. The cross section intersecting the axis SL of the rotating shell 10 refers to a cross section obtained when the rotating shell 10 is cut at a plane intersecting the axis SL. Furthermore, the cross sections of the first scraper member and the second scraper member refer to cross sections obtained when the first scraper member and the second scraper member are cut in the same direction as the cross section of the rotating shell 10.

[0056] In the following description, "intersecting with the axis SL of the rotating barrel 10" includes not only the case where the axis is perpendicular to the axis SL of the rotating barrel 10, but also the case where the axis is perpendicular to the axis SL of the rotating barrel 10 at a predetermined angle. In particular, the case where the axis is perpendicular to the axis SL of the rotating barrel 10 is typical.

[0057] (Workpiece W) There are no particular limitations on the workpiece W to be dried and provided to the horizontal rotary dryer 1. Specific examples include ores such as coal, copper ore, iron powder, and zinc powder, metal-based substances, inorganic substances such as gypsum, alumina, and soda ash, and dehydrated sludge.

[0058] (Horizontal rotary dryer 1) Next, the horizontal rotary dryer 1 will be described. The horizontal rotary dryer 1 is also not particularly limited, and for example, an indirect heating horizontal rotary dryer (also called a "steam tube dryer") or a kiln can be used. The drying method is not limited to indirect heating, and direct drying may also be used.

[0059] In an indirect heating horizontal rotary dryer, the frequency of contact between the heating tube and the workpiece must be increased to sufficiently dry the workpiece, and in order to increase the frequency of contact, it is important to adjust the filling rate of the workpiece inside the rotating shell 10 to an appropriate range. Therefore, the following configuration, which can adjust the filling rate of the workpiece to an appropriate range, is particularly suitable for indirect heating rotary dryers. The following description will be given using the indirect heating horizontal rotary dryer shown in Figures 1 and 2 as an example.

[0060] As illustrated in Figures 1 and 2, the horizontal rotary dryer 1 has a cylindrical rotating shell 10, which is installed so that its axis is slightly tilted relative to the horizontal plane, with one end ITS (the supply port side for the workpiece W) of the rotating shell 10 positioned higher than the other end OTS (the discharge port side for the workpiece W). Two support units 20 and a motor unit 30 are installed below the rotating shell 10 to support the rotating shell 10, and the rotating shell 10 is rotatable around its own axis by the motor unit 30. The rotating shell 10 rotates in one direction. The direction can be determined arbitrarily; for example, it can rotate counterclockwise when viewed from the one end ITS to the other end OTS.

[0061] A large number of steam tubes (heating tubes) 11, which are metal pipes, are attached inside the rotating shell 10 and extend along the axis of the rotating shell 10 as heat transfer tubes to the workpieces W. A plurality of these heating tubes 11 are arranged, for example, in the circumferential and radial directions so as to form concentric circles about the axis of the rotating shell 10. The heating tubes 11 are heated by steam or the like flowing through the interior of the heating tubes 11 as a heating medium.

[0062] A screw feeder 42 is connected to the ITS on one end of the rotating shell 10. A gas blowing means (not shown) is provided near the screw feeder 42, blowing carrier gas A (inert gas) into the interior of the rotating shell 10 from a supply port 41. The carrier gas A blown by this gas blowing means flows through the interior of the rotating shell 10, for example, toward the OTS on the other end of the rotating shell 10, and is then exhausted from an exhaust port 56. Note that the carrier gas A may be blown into the interior of the rotating shell 10 from another supply port (not shown) provided in the ITS on the one end other than the supply port 41. Alternatively, the carrier gas A may be blown into the interior of the rotating shell 10 from a supply port (not shown) in the OTS on the other end and exhausted from an exhaust port (not shown) in the ITS on the one end.

[0063] A discharge port 50 is formed in the center of the OTS on the other end of the rotating shell 10. A discharge pipe 51 is connected to this discharge port 50 so as to pass through the discharge port 50. A plurality of openings X are formed in the outer surface of the ITS on one end of the discharge pipe 51. A screw blade 24 is provided inside the discharge pipe 51 to send the dried material to be treated, i.e., the material to be treated E, from the ITS on one end to the OTS on the other end.

[0064] An exhaust casing 55 capable of discharging the material to be treated E and the carrier gas A may be provided at the other end OTS of the exhaust pipe 51 so as to cover the other end OTS of the exhaust pipe 51. This exhaust casing 55 is formed, for example, from a thick metal, and has an exhaust port 57 at the bottom for discharging the dried material to be treated E and an exhaust port 56 at the top for discharging the carrier gas A.

[0065] Further, at the other end OTS of the discharge casing 55, a steam supply pipe 72 for supplying steam into the heating pipe 11 and a drain discharge pipe 71 are provided.

[0066] (Drying Process) Next, the process of drying the workpiece W in the horizontal rotary dryer 1 will be described with reference to FIGS.

[0067] The material W to be treated is supplied from the supply port 41 into the screw feeder 42, and is supplied into the rotating shell 10 by rotating a screw installed inside the screw feeder 42 using a driving means (not shown). The material W supplied from the supply port 41 is heated and dried by contacting the outer surface of the heating tube 11 heated by steam, and moves to the OTS on the other end of the rotating shell 10 and piles up at the bottom. The material W piled up at the bottom of the OTS on the other end of the rotating shell 10 is scraped up by the first scraping member 60 and guided into the discharge pipe 51 through the opening X. After drying, the material W (i.e., material E) guided into the discharge pipe 51 is sent to the OTS on the other end by the screw blade 24, enters the discharge casing 55, and is discharged from a discharge port 57 provided below the discharge casing 55.

[0068] On the other hand, carrier gas A blown into the supply port 41 by a gas blowing means provided on one end side ITS of the rotating shell 10 passes through the interior of the rotating shell 10 and the gas passage U2 and is exhausted from an exhaust port 56 provided above the exhaust casing 55.

[0069] Furthermore, the steam supplied from the steam supply pipe 72 into the heating pipe 11 becomes drain as a result of heat exchange when the workpiece W comes into contact with the heating pipe 11 and is discharged from the drain discharge pipe 71 .

[0070] (Discharge Mechanism) Next, a description will be given of a discharge mechanism for the workpiece W, which sends the workpiece W from the other end of the rotating shell 10 into the discharge pipe 51. Note that descriptions of parts that overlap with the above description will be omitted.

[0071] When the material W supplied into the rotating shell 10 reaches the other end of the rotating shell 10, it is scraped up by the first scraping member 60, which rotates together with the rotating shell 10 as the rotating shell 10 rotates. Note that in Figures 3 to 11 and 13 to 20, which will be described later, the direction of rotation of the rotating shell 10 is indicated by the symbol R. The material W scraped up by the first scraping member 60 falls naturally due to gravity when the first scraping member 60 is positioned above the rotating shell 10, and enters the inside of the delivery passage U1 through the opening X of the discharge pipe 51 provided in the center of the other end OTS of the rotating shell 10.

[0072] Furthermore, as the rotating shell 10 rotates, the discharge pipe 51 fixed to the center of the OTS on the other end side of the rotating shell 10 also rotates. Because the screw blades 24 are fixed to the inner surface of the discharge pipe 51, the screw blades 24 also rotate as the discharge pipe 51 rotates. Therefore, the processed material E, which is the dried material W to be processed, is sent through the delivery passage U1 toward the openings 21 and 22 by the feeding action of the screw blades 24 and is discharged from the openings 21 and 22. The discharged processed material E is discharged from the discharge port 57 below the discharge casing 55 due to its own weight.

[0073] Furthermore, steam paths (an internal steam supply pipe 91 and an internal condensate discharge pipe 92) that penetrate the discharge casing 55 and extend into the partition wall 23 are provided integrally with the rotating shell 10. The internal steam supply pipe 91 communicates with an inlet header portion of the heating pipes 11 in the end plate portion 17, and the internal condensate discharge pipe 92 communicates with an outlet header portion of the heating pipes 11 in the end plate portion 17. Furthermore, the steam supply pipe 72 and the condensate discharge pipe 71 are connected to the internal steam supply pipe 91 and the internal condensate discharge pipe 92, respectively, via a rotary joint 63.

[0074] (First Scraping Member 60 According to the First Example) The first scraping member 60 according to the first example has a structure equipped with an adjustment mechanism that allows it to slide inward (BS) and outward (TS) of the rotating shell 10. An example of this structure is shown in FIGS. 5 to 8 . The first scraping member 60 in FIGS. 5 to 8 has two slidable plate-shaped scraping blades 60A, 60B located adjacent to each other. Specifically, the first scraping member 60 has an inner scraping blade 60A extending from the outer peripheral wall of the discharge pipe 51 in the radial direction RD toward the outer side (TS), and an outer scraping blade 60B located further outward (TS) in the radial direction RD than the inner scraping blade 60A. The inner scraping blade 60A is located at the back of the drawings in FIGS. 5 and 6 , and the outer scraping blade 60B is located at the front of the drawings in FIGS. 5 and 6 .

[0075] 5 to 8 showing the first embodiment, the first scraping member 60 is attached directly to the outer wall of the discharge pipe 51 and extends directly from the outer peripheral wall of the discharge pipe 51, but this is not a limitation. That is, the first scraping member 60 may be attached indirectly to the outer peripheral wall of the discharge pipe 51 via another member (such as a plate) and extend indirectly from the outer peripheral wall of the discharge pipe 51. This is not limited to the first embodiment, and is similar to other embodiments such as the second to seventh embodiments described below.

[0076] 5 to 8 showing the first embodiment, the first scraper member 60 (inner scraper blade 60A and outer scraper blade 60B according to the illustrations of FIGS. 5 to 8 ; the same applies below) is shown extending in the radial direction RD. However, the extending direction of the first scraper member 60 is not limited to the radial direction RD. In other words, it is not limited to a direction passing through the axis of the rotating shell 10. Specifically, the first scraper member 60 may extend from the inner side BS to the outer side TS of the rotating shell 10 in a cross section intersecting the axis of the rotating shell 10. In other words, the extending direction of the first scraper member 60 does not necessarily have to intersect the axis of the rotating shell 10. This applies not only to the first embodiment, but also to other embodiments such as the second to seventh embodiments.

[0077] 5 to 8 showing the first embodiment, the first scraping member 60 is provided between the outer wall of the discharge pipe 51 and the inner wall of the rotating shell 10. This is true not only for the first embodiment, but also for other embodiments such as the second to seventh embodiments.

[0078] In the first embodiment, a fixing member 60C having a rivet-shaped cross section perpendicular to the extension direction of the inner scraper blade 60A is provided at the tip of the inner scraper blade 60A, and the outer scraper blade 60B moves inside this fixing member 60C. This fixing member 60C prevents the outer scraper blade 60B from separating from the inner scraper blade 60A. Note that the fixing member 60C shown in the figure is an example. Other fixing members 60C may be used as long as they can maintain the inner scraper blade 60A and the outer scraper blade 60B adjacent to each other and allow the outer scraper blade 60B to move continuously or temporarily toward the outer TS and the inner BS.

[0079] The tip of the outer scraping blade 60B is bent in the rotation direction S of the first scraping member 60. This bent tip is called a protrusion 60D. The workpieces W piled up in the lower part of the rotating shell 10 are mainly scraped up by the outer scraping blade 60B.

[0080] The means for moving the outer scraper blade 60B to the inner BS and the outer TS is not particularly limited. For example, a control rod 70 as shown in FIGS. 5 to 8 can be used. This control rod 70 is attached to the back surface of the outer scraper blade 60B (the surface in the direction in which the protrusion 60D extends is called the front surface, and the surface in the opposite direction is called the back surface). As shown in FIGS. 5 and 7, when the control rod 70 is pulled toward the outer TS, the outer scraper blade 60B moves to the outer TS. Conversely, as shown in FIGS. 6 and 8, when the control rod 70 is pushed toward the inner BS, the outer scraper blade 60B moves to the inner BS.

[0081] More specifically, as shown in Figures 7 and 8, the side wall of the inner BS of the control rod 70 is joined to the back surface of the outer scraper blade 60B by welding or the like. In Figures 7 and 8, the welded portion between the control rod 70 and the outer scraper blade 60B is indicated by the reference numeral 69. The control rod 70 extends from the welded portion 69 to the outer TS. Specifically, the control rod 70 extends from the inner BS of the rotating shell 10 through the inside of a through-hole 10H provided in the rotating shell 10 to the outer TS.

[0082] A nut 66 and a support part 65 that supports the nut 66 are provided immediately outside the through hole 10H of the rotating shell 10. The support part 65 is integrated with the rotating shell 10, so that its cross section is roughly U-shaped, and the nut 66 is inserted between the rotating shell 10 and the support part 65. The nut 66 and the support part 65 are also provided with through holes 66H, 65H, respectively, and the control rod 70 passes through the inside of these through holes 66H, 65H and extends outward TS.

[0083] The nut 66 is sandwiched between the rotating shell 10 and the support part 65, so that the nut 66 can rotate but cannot move to the inner BS or outer TS. In the embodiment shown in Figures 7 and 8, the control rod 70 is a bolt that screws into the nut 66, and as the nut 66 rotates, the control rod 70 moves to the inner BS or outer TS, and as the control rod 70 moves, the outer scraper blade 60B also moves to the inner BS or outer TS.

[0084] 7 and 8, a mechanism using bolts and nuts has been described as the mechanism for moving the control rod 70, but the mechanism for moving the control rod 70 is not limited to this. For example, although not shown, a mechanism may be used in which the control rod 70 is moved to the inner BS or outer TS by a cylinder or the like and a fastener or the like is provided to hold the state after movement.

[0085] 5 to 8 are merely examples, and the present invention is not limited to these. For example, the first scraping member 60 may be formed with three or more scraping blades instead of two.

[0086] 5 shows the first scraping member 60 in a state in which the outer scraping blade 60B is fully extended outward TS. At this time, the outer surface of the protruding portion 60D of the outer scraping blade 60B is in contact with the inner surface of the rotating shell 10. In this way, the outer scraping blade 60B may be configured to be able to extend until it can contact the inner surface of the rotating shell 10, but it does not have to be configured to be able to extend it until it contacts the inner surface of the rotating shell 10.

[0087] Specifically, when the distance from the outer surface of the discharge pipe 51 to the inner surface of the rotating shell 10 is 100, it is preferable that the distance over which the scraper blade 60 can be extended (the distance extending from the outer surface of the discharge pipe 51 to the outer TS) is 40 or more, and it is more preferable that the scraper blade 60 can be extended until the distance reaches 100 (until it comes into contact with the inner surface of the rotating shell 10). If the distance is shorter than 40, the amount of the workpiece W that can be scraped up by the first scraper member 60 is too small, which causes the workpiece W to accumulate too much below the other end OTS of the rotating shell 10.

[0088] On the other hand, if the distance is too long, problems are unlikely to occur. This is because, during normal operation, the length of the first scraping member 60 should not be long so as not to discharge too much of the workpieces W below the OTS on the other end of the rotating shell 10. On the other hand, when the operation of the horizontal rotary dryer 1 is finished, as shown in Figure 5, the length of the first scraping member 60 should be made as long as possible so that all of the workpieces W accumulated below the OTS on the other end of the rotating shell 10 are discharged from the rotating shell 10.

[0089] As described above, with the configurations shown in Figures 5 to 8, the extension length of the first scraping member 60 can be arbitrarily changed. That is, the area of ​​the front surface of the first scraping member 60 in the rotation direction S (referring to the surface on the rotation direction S side; the same applies below) can be arbitrarily changed. Figure 3 shows the state before the first scraping member 60 extends outward TS, and Figure 4 shows the state after the first scraping member 60 has extended further outward TS than in Figure 3.

[0090] In Fig. 3, the extension direction of the first scraper members 60 located at the bottom and top right of the drawing is the radial direction RD, while the extension direction of the first scraper member 60 located at the top left of the drawing is not the radial direction RD. In Fig. 4, all of the first scraper members 60 extend in the radial direction RD. As in Fig. 3, the extension directions of the multiple first scraper members 60 may be different directions, or as in Fig. 4, the extension direction of the multiple first scraper members 60 may all be the same direction. Although the extension direction of the first scraper member 60 located at the top left of Fig. 3 is not the radial direction RD, it extends from the inner side BS to the outer side TS of the rotating shell 10 in a cross section intersecting the axis of the rotating shell 10.

[0091] The longer the length that the first scraping-up member 60 extends toward the outer TS, the more of the materials W that can be scraped up that have accumulated below the OTS on the other end side of the rotating shell 10. Therefore, by changing the length of the first scraping-up member 60, the amount of materials W that accumulate below the OTS on the other end side of the rotating shell 10 (and therefore the filling rate of the materials W) can be easily controlled, as shown in Figures 3 and 4 .

[0092] 3 and 4 show the amount of accumulated workpieces W when the rotating shell 10 is stopped for ease of understanding. However, when the rotating shell 10 actually starts to rotate, the workpieces W are also lifted upward by the heating pipes 11, and therefore the workpieces W are dispersed in a crescent shape inside the rotating shell 10.

[0093] Furthermore, not only in the first embodiment but also in other embodiments such as the second to seventh embodiments, the number of first scraping-up members 60 provided inside the rotating barrel 10 can be determined arbitrarily and is not particularly limited. For example, although three first scraping-up members 60 are provided in the examples shown in Figures 3 and 4, one, two, or four or more first scraping-up members 60 may be provided.

[0094] Furthermore, not only in the first embodiment but also in other embodiments such as the second to seventh embodiments, the positions at which the first scraping members 60 are provided in the circumferential direction of the rotating shell 10 can be determined arbitrarily and are not particularly limited. In the examples shown in FIGS. 3 and 4 , three first scraping members 60 are provided at intervals of approximately 120 degrees relative to the axis of the rotating shell 10, but the intervals between the multiple first scraping members 60 do not necessarily have to be so even. However, by providing as even intervals as possible between the first scraping members 60 in the circumferential direction of the rotating shell 10, the rotational dynamics of the workpieces W at the other end (OTS) of the rotating shell 10 can be stabilized, and as a result, the workpieces W can be constantly guided to the openings X.

[0095] In addition to the first embodiment, in other embodiments such as the second to seventh embodiments, when the heating pipes 11 are provided inside the rotating shell 10 as shown in, for example, FIG. 3 and FIG. 4 , it is necessary to prevent the first scraping member 60 from coming into contact with the heating pipes 11 when the first scraping member 60 is extended.

[0096] 9 to 12 show a first scraper member 61 according to a second embodiment. The first scraper member 61 according to the second embodiment has a fixed blade 61A, an outer rotating blade 61B, an inner rotating blade 61C, and an intermediate rotating blade 61D. Note that the intermediate rotating blade 61D is not necessarily required and may be omitted.

[0097] 9 to 12 is made of a flat plate, and its base end is fixed to the outer surface of the discharge pipe 51. The fixed blade 61A extends outward TS from the connection between the discharge pipe 51 and the fixed blade 61A.

[0098] 9 to 12, an annular support ring 81 is fixed by welding or the like to the front surface of the fixed blade 61A (the surface in the direction in which a rotational direction-extending wall 61Bb described later extends is called the front surface, and the surface in the opposite direction is called the back surface). More specifically, the support ring 81 in FIGS. 9 to 12 has an annular shape, and is arranged so that the axis of the support ring 81 is along the radial direction RD (not limited to the radial direction RD, but may extend from the inner side BS to the outer side TS of the rotating shell 10 in an intersecting cross section that intersects the axis of the rotating shell 10), and a part of the outer peripheral surface of the support ring 81 is fixed to the front surface of the fixed blade 61A.

[0099] A rotation control rod 80 (an example of a rotating member) is inserted into a through-hole inside the support ring 81. More specifically, the base end of the rotation control rod 80 is inserted into the through-hole of the support ring 81, and the inserted rotation control rod 80 is rotatable around the axis of the rotation control rod 80 inside the support ring 81. As described above, by inserting the base end of the rotation control rod 80 into the through-hole of the support ring 81, the base end side of the rotation control rod 80 is supported by the support ring 81.

[0100] On the other hand, the rotation control rod 80 extends from the portion inserted into the support ring 81 in the radial direction RD toward the outer side TS, and its tip end portion is fixed to the rotating shell 10. The extending direction of the rotation control rod 80 is not limited to the radial direction RD, but may extend from the inner side BS of the rotating shell 10 to the outer side TS in a cross section intersecting the axis of the rotating shell 10. When fixing the rotation control rod 80 to the rotating shell 10, it is preferable to fix the rotation control rod 80 loosely so that the rotation control rod 80 can rotate. For example, as shown in FIG. 12 , a through hole 10A may be formed in the rotating shell 10, and a tubular fixed tube 10B may be provided that extends from the periphery of the through hole 10A to the outer side TS of the rotating shell 10. The rotation control rod 80 may then be fixed so as to pass through the inside of the through hole 10A and the inside of the fixed tube 10B and further extend to the outer side TS.

[0101] In the examples of Figures 9 to 12, the rotation control rod 80 is provided at the other end OTS at the end of the OTS at the other end side in the longitudinal direction LD of the rotating shell 10, but the position at which the rotation control rod 80 is provided is not limited to this location, and the rotation control rod 80 may also be provided at one end side ITS at the end of the OTS at the other end side in the longitudinal direction LD of the rotating shell 10.

[0102] As shown in Figure 9, the rotation control rod 80 can rotate circumferentially around its axial center. The rotation control rod 80 in Figure 9 rotates clockwise (left side of Figure 9). The rotation direction CD of the rotation control rod 80 in Figure 9 is indicated by a dotted arrow. Furthermore, from the state in Figure 10, the rotation control rod 80 can be rotated in both the clockwise and counterclockwise directions (both the left and right sides of Figure 10), and from the state in Figure 11, the rotation control rod 80 can be rotated counterclockwise (right side of Figure 11), so these rotation directions CD are also indicated by dotted arrows.

[0103] The outer rotary vanes 61B, the intermediate rotary vanes 61D, and the inner rotary vanes 61C are fixed to the peripheral wall of the rotation control rod 80.

[0104] The outer rotating blade 61B has a shape formed by bending a plate material into an L-shape. The outer rotating blade 61B has an outer extending wall 61Ba extending outwardly (TS) and a rotational direction extending wall 61Bb extending from the tip of the outer extending wall 61Ba in the rotational direction S of the first scraping member 61. In the outer rotating blade 61B shown in FIGS. 9 to 11, the inner angle between the outer extending wall 61Ba and the rotational direction extending wall 61Bb is approximately right angles. When the horizontal rotary dryer 1 is finished operating, it is necessary to discharge all of the workpieces W from the interior of the rotating shell 10. To discharge all of the workpieces W from the rotating shell 10, it is preferable to position the outer rotating blade 61B near the inner wall of the rotating shell 10 and ensure that the tip of the rotational direction extending wall 61Bb is in contact with the inner wall of the rotating shell 10, as shown in FIG. 9. To achieve this state, it is preferable that the inner angle between the outer extending wall 61Ba and the rotation direction extending wall 61Bb be approximately a right angle. In the state shown in Figure 9, the outer rotating blade 61B forms a scraping blade that scrapes up the workpiece W using the fixed blade 61A and the outer rotating blade 61B. As the rotating shell 10 rotates, the workpiece W is scraped upward while being held in the inner angle between the outer extending wall 61Ba and the rotation direction extending wall 61Bb.

[0105] A flat inner rotating blade 61C extending substantially perpendicular to the direction of extension of the fixed blade 61A is provided on the inner BS of the outer rotating blade 61B and further in the direction of rotation S of the first scraper 61 than the outer rotating blade 61B. When the rotation control rod 80 is rotated to rotate the inner rotating blade 61C to the state shown in Figures 9 to 11, the inner rotating blade 61C is preferably positioned so that the outer TS edge of the fixed blade 61A and the inner BS surface of the inner rotating blade 61C are slightly in contact with each other to prevent the inner rotating blade 61C from getting caught on the fixed blade 61A and becoming immobile. In other words, the inner rotating blade 61C is preferably positioned slightly outward of the outer TS edge of the fixed blade 61A. 11, the fixed blade 61A and the inner rotating blade 61C form a scraping blade that scrapes up the workpiece W. That is, as the rotating shell 10 rotates, the workpiece W is scraped up upward while being held in the inner angle between the fixed blade 61A and the inner rotating blade 61C.

[0106] It is preferable to provide an intermediate rotating blade 61D between the rotational direction-extending wall 61Bb of the outer rotating blade 61B and the inner rotating blade 61C. In the embodiment shown in Figures 9 to 12, the intermediate rotating blade 61D has a shape formed by bending a plate material into an L shape, similar to the outer rotating blade 61B. This intermediate rotating blade 61D has an outward extending wall 61Da extending outward TS and a rotational direction-extending wall 61Db extending from the tip of the outward extending wall 61Da in the rotational direction S of the first scraping member 61. In the intermediate rotating blade 61D shown in Figures 9 to 12, the inner angle between the outward extending wall 61Da and the rotational direction-extending wall 61Db is approximately a right angle, but is not limited to a right angle and may be approximately 60 to 90 degrees. 10, the intermediate rotary blade 61D, together with the fixed blade 61A, forms a scraping blade that scrapes up the workpiece W. As the rotating shell 10 rotates, the workpiece W is scraped upward while being held in the inner angle between the outward extending wall 61Da and the rotation direction extending wall 61Db.

[0107] 9 to 11 , the front surface (the right surface in FIGS. 9 to 11 ) of the outward extending wall 61Ba of the outer rotating vane 61B and the end surface of the rotational direction extending wall 61Bb, respectively, portions located on the other end side OTS in the longitudinal direction LD of the rotating shell 10, are fixed to the rotation control rod 80. Similarly, the front surface (the right surface in FIGS. 9 to 11 ) of the outward extending wall 61Da of the intermediate rotating vane 61D and the end surface of the rotational direction extending wall 61Db, respectively, portions located on the other end side OTS in the longitudinal direction LD of the rotating shell 10, are fixed to the rotation control rod 80. Furthermore, the portion of the end surface of the inner rotating vane 61C, respectively, portions located on the other end side OTS in the longitudinal direction LD of the rotating shell 10, are fixed to the rotation control rod 80.

[0108] With the above configuration, the outer rotating vane 61B, the inner rotating vane 61C, and the intermediate rotating vane 61D rotate in the circumferential direction of the rotation axis of the rotation control rod 80. The rotation direction of each of the vanes 61B, 61C, and 61D is the same as the rotation direction of the rotation control rod 80. In other words, when the rotation control rod 80 rotates clockwise (left side in FIGS. 9 to 11), the outer rotating vane 61B, the inner rotating vane 61C, and the intermediate rotating vane 61D also rotate clockwise (left side in FIGS. 9 to 11). Note that, for example, from the state shown in FIGS. 10 and 11, the rotation control rod 80 may be rotated counterclockwise (right side in FIGS. 10 and 11), causing the outer rotating vane 61B, the inner rotating vane 61C, and the intermediate rotating vane 61D to rotate counterclockwise (right side in FIGS. 10 and 11).

[0109] Although the rotation angle of the outer rotating vane 61B, the inner rotating vane 61C, and the intermediate rotating vane 61D when rotating clockwise or counterclockwise is not limited, it is preferable to rotate them in one go until they reach a predetermined angle. After the rotation control rod 80 is rotated, it is preferable that any of the outer rotating vane 61B, the inner rotating vane 61C, and the intermediate rotating vane 61D is connected to the fixed vane 61A.

[0110] The rotation of the rotation control rod 80 will be described in detail below. Figure 9 shows a state in which the outer rotating blade 61B, the inner rotating blade 61C, and the intermediate rotating blade 61D are positioned furthest forward (to the right in Figure 9). With Figure 9 as the initial state, Figure 10 shows the state after the first rotation, and Figure 11 shows the state after the second rotation. In the state of Figure 9, the workpiece W is scraped up mainly by the fixed blade 61A and the outer rotating blade 61B. In the state of Figure 10, the workpiece W is scraped up mainly by the fixed blade 61A and the intermediate rotating blade 61D. In the state of Figure 11, the workpiece W is scraped up mainly by the fixed blade 61A and the inner rotating blade 61C.

[0111] 9, the outer extending wall 61Ba of the outer rotating blade 61B and the fixed blade 61A are connected in a straight line in the radial direction RD (continuous state). In this state, by rotating the first scraping member 61 in the rotation direction S of the first scraping member 61, the outer rotating blade 61B scrapes off most of the workpieces W accumulated at the bottom of the rotating shell 10, and the scraped workpieces W are scraped upward by the outer rotating blade 61B and the fixed blade 61A, and the scraped workpieces W are guided through the opening X into the discharge pipe 51. At this time, the inner rotating blade 61C and the intermediate rotating blade 61D are not connected to the fixed blade 61A, and therefore do not function much as a means for scraping up the workpieces W.

[0112] When the rotation control rod 80 is rotated one step clockwise (to the left in FIG. 9 ) to the state shown in FIG. 10 , the outer extending wall 61Da of the intermediate rotating blade 61D and the fixed blade 61A are aligned in a straight line in the radial direction RD (continuous state). In this state, by rotating the first scraper 61 in the rotation direction S of the first scraper 61, the intermediate rotating blade 61D scrapes off a portion of the workpieces W accumulated at the bottom of the rotating shell 10, and the scraped workpieces W are then scraped upward by the intermediate rotating blade 61D and the fixed blade 61A, and the scraped workpieces W are guided through the opening X into the discharge pipe 51. Note that in this state, the outer rotating blade 61B and the inner rotating blade 61C are not continuous with the fixed blade 61A, and therefore do not function as a means for scraping up the workpieces W.

[0113] 11, the inner rotating blade 61C and the fixed blade 61A are connected in an L-shape (continuous state). In this state, by rotating the first scraping member 61 in the rotation direction S of the first scraping member 61, the inner rotating blade 61C scrapes off a further portion of the workpieces W accumulated at the bottom of the rotating shell 10. The scraped workpieces W are then scraped upward by the inner rotating blade 61C and the fixed blade 61A, and the scraped workpieces W are guided through the opening X into the discharge pipe 51. In this state, the outer rotating blade 61B and the intermediate rotating blade 61D are not connected to the fixed blade 61A, and therefore do not function as a means for scraping up the workpieces W.

[0114] 9 to 11, of the outer rotating blade 61B, inner rotating blade 61C, and intermediate rotating blade 61D, the outer rotating blade 61B is located furthest from the outer TS, and therefore the state in which the fixed blade 61A and the outer rotating blade 61B are connected as shown in Fig. 9 can scrape up the most material to be treated W. Furthermore, of the outer rotating blade 61B, inner rotating blade 61C, and intermediate rotating blade 61D, the intermediate rotating blade 61D is located next to the outer TS, and therefore the state in which the fixed blade 61A and the intermediate rotating blade 61D are connected as shown in Fig. 10 can scrape up the next most material to be treated W. Of the outer rotating blade 61B, the inner rotating blade 61C, and the intermediate rotating blade 61D, the inner rotating blade 61C is located at the innermost BS, and therefore the state in which the fixed blade 61A and the inner rotating blade 61C are connected as shown in Figure 11 results in the least amount of workpiece W being scraped up.

[0115] As described above, by rotating the rotation control rod 80, any one of the outer rotating blade 61B, inner rotating blade 61C, and intermediate rotating blade 61D is connected to the fixed blade 61A. By arbitrarily selecting which of the outer rotating blade 61B, inner rotating blade 61C, and intermediate rotating blade 61D is connected to the fixed blade 61A, the front surface area of ​​the first scraper 61 in the rotation direction S can be arbitrarily changed, and the amount of scraping up of the workpiece W can be freely changed.

[0116] For example, when a large amount of materials W to be treated is stored below the OTS on the other end side of the rotating shell 10 and it is desired to put a large amount of materials W from the rotating shell 10 into the inside of the discharge pipe 51, it is preferable to make the outer rotating blade 61B continuous with the fixed blade 61A as shown in Fig. 9. Conversely, when the filling rate of materials W to be treated inside the rotating shell 10 is low and it is desired to increase the filling rate, it is preferable to make the inner rotating blade 61C continuous with the fixed blade 61A as shown in Fig. 11.

[0117] As described above, by providing the inner rotating blades 61C and the intermediate rotating blades 61D, it is possible to more easily adjust the amount of workpiece W scraped up (and therefore more easily adjust the filling rate of the workpiece W) compared to when the inner rotating blades 61C and the intermediate rotating blades 61D are not provided.

[0118] 9 to 12, only one intermediate rotary blade 61D is provided, but the number of intermediate rotary blades 61D is not particularly limited, and two or more intermediate rotary blades 61D may be provided. The greater the number of intermediate rotary blades 61D, the easier it is to adjust the amount of workpiece W scraped up.

[0119] As shown in Fig. 9, the state in which the outer rotating blade 61B is connected to the fixed blade 61A is the state in which the workpiece W can be most easily scraped up, and as shown in Fig. 11, the state in which the inner rotating blade 61C is connected to the fixed blade 61A is the state in which the amount of scraped up workpiece W is small. The intermediate rotating blade 61D is intended to finely adjust the amount of scraped up workpiece W between these two states. Therefore, in the radial direction RD, it is preferable that the rotational direction extending wall 61Db of the intermediate rotating blade 61D be positioned between the rotational direction extending wall 61Bb of the outer rotating blade 61B and the inner rotating blade 61C. When multiple intermediate rotary vanes 61D are provided, it is preferable to provide multiple rotational direction extending walls 61Db of the intermediate rotary vanes 61D between the rotational direction extending wall 61Bb of the outer rotary vane 61B and the inner rotary vane 61C in the radial direction RD.

[0120] The second embodiment has the following advantages over the first embodiment.

[0121] First, in the first embodiment, the control rod 70 may slide against the through holes 10H, 65H, and 66H provided in the rotating shell 10, the support portion 65, and the nut 66, respectively. At the same time, the outer scraper blade 60B may also slide against the inner scraper blade 60A and the fixed member 60C. In such cases, the area of ​​the sliding portion is large in the first embodiment. In contrast, in the second embodiment, the sliding portion of the rotation control rod 80 is limited to the through hole 10A of the rotating shell 10 and the inner wall of the support ring 81, and the area of ​​the sliding portion is smaller than that of the first embodiment. Therefore, the rotation control rod 80 of the second embodiment has the advantage of being easier to operate than the control rod 70 of the first embodiment.

[0122] Furthermore, in the first embodiment, the control rod 70 is configured to move to the inner BS and the outer TS. Therefore, if the control rod 70 is moved to the outer TS with the workpiece W sandwiched between the through-hole 10H of the rotating shell 10 and the control rod 70, there is a possibility that a portion of the sandwiched workpiece W will leak out of the rotating shell 10. In contrast, in the second embodiment, the rotation control rod 80 does not move to the inner BS or the outer TS, so there is an advantage that even if the workpiece W is sandwiched between the through-hole 10A of the rotating shell 10 and the rotation control rod 80, there is a low possibility that a portion of the workpiece W will leak out of the rotating shell 10.

[0123] Furthermore, in the first embodiment, since the control rod 70 is configured to move to the inner BS and the outer TS, if the control rod 70 is repeatedly moved to the inner BS and the outer TS while the workpiece W is sandwiched between the through-hole 10H of the rotating shell 10 and the control rod 70, the amount of workpiece W that enters the gap between the through-hole 10H of the rotating shell 10 and the control rod 70 increases, and the workpiece W that has entered gradually compacts. As a result, it may ultimately become difficult to move the control rod 70 to the inner BS and the outer TS. In contrast, in the second embodiment, the rotation control rod 80 is simply rotated, and is not moved to the inner BS and the outer TS as in the first embodiment, which can prevent malfunctions such as malfunctions of the rotation control rod 80.

[0124] (First scraping member 73 according to the third embodiment) A first scraping member 73 according to the third embodiment is shown in Figures 13 and 14. In this third embodiment, the first scraping member 73 attached directly or indirectly to the peripheral wall of the discharge pipe 51 can be replaced.

[0125] For example, as shown in Fig. 13, when a first scraper member 73A having a short length in the radial direction RD is attached to the peripheral wall of the discharge pipe 51, the first scraper member 73A can be removed and replaced with a first scraper member 73B having a longer length in the radial direction RD, as shown in Fig. 14. By replacing the existing first scraper member 73A having a short length in the radial direction RD with a new first scraper member 73B having a longer length in the radial direction RD as the first scraper member 73 attached to the peripheral wall of the discharge pipe 51 in this manner, the front surface area of ​​the first scraper member 73 in the rotation direction S can be increased, and the amount of workpieces W scraped up below the other end OTS of the rotating shell 10 can be increased. Note that, although not shown, for example, bolts and nuts may be used to attach the first scraper member 73 to the discharge pipe 51.

[0126] Conversely, if it is desired to reduce the amount of workpiece W scraped up, the first scraping member 73B having a long length in the radial direction RD as shown in Figure 14 can be removed and replaced with the first scraping member 73A having a short length in the radial direction RD as shown in Figure 13.

[0127] In the above description, two types of first scraping members 73, namely, first scraping members 73A having a short length in the radial direction RD and first scraping members 73B having a long length in the radial direction RD, are prepared and interchangeable. However, this is not necessarily limited to this configuration. For example, three or more types of first scraping members 73 having different lengths in the radial direction RD may be prepared as the first scraping members 73, and these may be interchangeable depending on the amount of workpiece W to be scraped. The more types of first scraping members 73 (first scraping members 73 having different lengths in the radial direction RD) prepared in advance, the more precisely the amount of workpiece W scraped can be changed.

[0128] The first scraping member 73 is preferably replaced after the rotation of the rotating shell 10 has been stopped. For example, the timing may include before starting operation of the horizontal rotary dryer 1, while the operation is stopped, or after the operation has been completed.

[0129] Unlike the first and second embodiments, this third embodiment does not have a through hole 10A in the peripheral wall of the rotating shell 10, which has the advantage that there is no risk of the workpiece W inside the rotating shell 10 leaking out of the rotating shell 10 through the through hole 10A.

[0130] 15 to 20 show a first scraping member 75 according to a fourth embodiment. In the fourth embodiment, the first scraping member 75 is attached directly or indirectly to the peripheral wall of the discharge pipe 51. By attaching an extension member 76 to the tip of the first scraping member 75, which is formed to extend outward TS directly or indirectly from the peripheral wall of the discharge pipe 51 in this manner, the length of the first scraping member 75 in the radial direction RD can be extended.

[0131] For example, as shown in Figures 15 and 18, a first scraping-up member 75 having a short length in the radial direction RD can be extended from the peripheral wall of the discharge pipe 51, and then, as shown in Figures 16 and 19, a first extension member 76A can be attached to the tip of the first scraping-up member 75. By attaching the first extension member 76A in this way, the amount of workpieces W piled up below the other end OTS of the rotating shell 10 can be increased.

[0132] If it is desired to further increase the amount of workpieces W piled up below the other end (OTS) of the rotating shell 10, an extension member 76 having a longer length in the radial direction RD can be attached to the tip of the first scraping-up member 75. For example, as shown in Figures 17 and 20, a second extension member 76B can be attached to the tip of the first scraping-up member 75. Because the length in the radial direction RD of the second extension member 76B is longer than the length in the radial direction RD of the first extension member 76A, the amount of workpieces W scraped up can be further increased.

[0133] On the other hand, if it is desired to reduce the amount of workpiece W scraped up, the extension member 76 may be omitted as shown in FIG. 15 or FIG.

[0134] In the above description, two types of extension members 76, the first extension member 76A and the second extension member 76B, are prepared and added as needed. However, the present invention is not limited to this configuration. For example, another extension member 76 (e.g., a third extension member) having a different length in the radial direction RD from the first extension member 76A and the second extension member 76B may be prepared and attached to the tip of the first scraping member 75. The more types of extension members 76 (extension members 76 having different lengths in the radial direction RD) that are prepared in advance, the more precisely the amount of scraping up of the workpiece W can be adjusted.

[0135] The extension member 76 is preferably replaced after the rotation of the rotating shell 10 has been stopped. For example, this can be done before the horizontal rotary dryer 1 starts operating, while the operation is stopped, or after the operation has finished.

[0136] Unlike the first and second embodiments, this fourth embodiment does not have a through hole 10A in the peripheral wall of the rotating shell 10, which has the advantage that there is no risk of the workpiece W inside the rotating shell 10 leaking out of the rotating shell 10 through the through hole 10A.

[0137] There is no particular limitation on the method for attaching the extension member 76 to the tip of the first scraping member 75. For example, as shown in Figures 15 to 20, a connecting hole 77 may be provided at the tip of the first scraping member 75, and the first scraping member 75 and the extension member 76 may be connected via this connecting hole 77 using a bolt 78 and a nut 79.

[0138] Furthermore, although the above description has been given of a configuration in which the extension member 76 is attached to the tip of the first scraping member 75, the present invention is not necessarily limited to this configuration. For example, after attaching an extension member 76 to the tip of the first scraping member 75, another extension member 76 may be attached to the tip of the extension member 76, thereby increasing the length in the radial direction RD of the entire portion connecting the first scraping member 75 and the extension member 76, and thereby increasing the amount of workpiece W scraped up.

[0139] 19 and 20 , the first scraper member 75 according to the fourth embodiment has an L-shaped cross section, and the extension member 76 connected to the first scraper member 75 also has a similar L-shaped cross section. Specifically, the extension member 76 has an outward extending wall 76X extending in the outward TS direction, a first rotational direction extending wall 76Y extending from the outward TS end of the outward extending wall 76X in the rotational direction S of the first scraper member 75, and a second rotational direction extending wall 76Z extending from an intermediate portion of the outward extending wall 76X in the rotational direction S of the first scraper member 75. The front surface (the surface facing the rotational direction S) of the outward extending wall 76X and the upper surface (the surface facing the inner BS) of the second rotational direction extending wall 76Z are fixed in contact with the outward TS portion of the first scraper member 75.

[0140] At this time, the workpiece W scraped up by the extension member 76 tends to get into the corner 76Q between the front surface of the outer extending wall 76X and the underside (the outer TS surface) of the second rotation direction extending wall 76Z, which creates the problem that the workpiece W becomes difficult to enter the opening X.

[0141] To solve this problem, it is preferable to provide a plate-shaped guide member 74 on the extension member 76, as shown in Figures 16, 17, 19, and 20. Specifically, it is preferable to provide the guide member 74 extending from a portion of the outer extending wall 76X between the first rotational direction extending wall 76Y and the second rotational direction extending wall 76Z toward the tip of the second rotational direction extending wall 76Z. By providing this guide member 74, it becomes difficult for the workpiece W to get into the corner 76Q between the front surface of the outer extending wall 76X and the underside of the second rotational direction extending wall 76Z, so that the workpiece W scraped up by the extension member 76 can be smoothly guided to the opening X.

[0142] (Second scraper member 85 according to the fifth embodiment) A second scraper member 85 according to the fifth embodiment is shown in Figures 21 and 22. In Figures 21 and 22, a second scraper member 85 according to the fifth embodiment is provided in addition to the first scraper member 75 according to the fourth embodiment. The second scraper member 85 of the fifth embodiment extends to the inner wall of the rotating barrel 10, and has a through-hole 86 formed in the outer TS. The through-hole 86 can be closed or opened by sliding an opening / closing door 87 between the inner BS and the outer TS.

[0143] For example, when it is desired to discharge all of the materials W remaining in the rotating shell 10 and empty the rotating shell 10, such as when the operation of the horizontal rotary dryer 1 is finished, the retractable door 87 is closed to block the through-hole 86 as shown in Figure 21. This prevents the materials W placed on the second scraping-up member 85 from leaking out through the through-hole 86, and allows the materials W to be scraped up.

[0144] If one were to empty the workpieces W from the rotating cylinder 10 using only the first scraping member 75 of the fourth embodiment, it would be necessary to attach an extension member 76 to the first scraping member 75 and position the tip of the extension member 76 near the inner wall of the rotating cylinder 10, which would be time-consuming to attach the extension member 76.

[0145] As in the fifth embodiment, by providing the second scraping member 85 in addition to the first scraping member 75, it is possible to scrape up the workpieces W at the bottom of the OTS at the other end of the rotating shell 10 by closing the opening / closing door 87 of the second scraping member 85 to block the through-hole 86, without attaching the extension member 76 to the first scraping member 75. Therefore, compared to the case in which the extension member 76 is attached to the first scraping member 75 of the fourth embodiment, providing both the first scraping member 75 and the second scraping member 85 makes it easier to scrape up the workpieces W at the bottom of the OTS at the other end of the rotating shell 10 and discharge them outside the rotating shell 10.

[0146] Conversely, during normal operation of the horizontal rotary dryer 1, the retractable door 87 is opened to leave the through-hole 86 open, as shown in Figure 22. This causes most of the materials W placed on the second scraping member 85 to pass through the through-hole 86 and leak out in the direction opposite to the rotation direction S of the second scraping member 85. In this way, the filling rate can be adjusted by preventing the second scraping member 85 from scraping up the materials W and adjusting the amount of materials W scraped up by the first scraping member 75.

[0147] There is no particular limitation on the method for moving the opening / closing door 87 to the inner BS and the outer TS. For example, as shown in Figures 21 and 22, a control rod 88 may be connected to the opening / closing door 87, the outer TS portion of the control rod 88 may be supported by the rotating shell 10, and the opening / closing door 87 may be moved to the inner BS or the outer TS by moving the control rod 88 to the inner BS or the outer TS.

[0148] 21 and 22, the through-hole 86 is provided on the outer side TS of the second scraping member 85, but the present invention is not limited to this. For example, the through-hole 86 may be provided on the inner side BS of the second scraping member 85 as shown in FIGS.

[0149] (Second scraper member 95 according to the sixth embodiment) A second scraper member 95 according to the sixth embodiment is shown in Figures 23 to 25. In the sixth embodiment, in addition to the first scraper member 75 according to the fourth embodiment, a second scraper member 95 according to the sixth embodiment is provided. The second scraper member 95 of the sixth embodiment extends to the inner wall of the rotating barrel 10 and has a through-hole 96 on the outer side TS, and the through-hole 96 can be blocked or opened by opening an opening / closing door 97 toward the rear side in the rotation direction S of the second scraper member 95 (the direction opposite to the rotation direction S).

[0150] For example, when it is desired to discharge all of the materials W remaining in the rotating shell 10 and empty the rotating shell 10, such as when the operation of the horizontal rotary dryer 1 is finished, the retractable door 97 is closed to block the through-hole 96 as shown in Figure 23. This prevents the materials W placed on the second scraping-up member 95 from leaking out through the through-hole 96, and allows the materials W to be scraped up.

[0151] If one were to empty the workpieces W from the rotating cylinder 10 using only the first scraping member 75 of the fourth embodiment, it would be necessary to attach an extension member 76 to the first scraping member 75 and position the tip of the extension member 76 near the inner wall of the rotating cylinder 10, which would be time-consuming to attach the extension member 76.

[0152] As in the sixth embodiment, by providing the second scraping member 95 in addition to the first scraping member 75, it is possible to scrape up the workpieces W at the bottom of the OTS at the other end of the rotating shell 10 by closing the opening / closing door 97 of the second scraping member 95 to block the through-hole 96, even without attaching the extension member 76 to the first scraping member 75. Therefore, compared to the case in which the extension member 76 is attached to the first scraping member 75 of the fourth embodiment, providing both the first scraping member 75 and the second scraping member 95 makes it easier to scrape up the workpieces W at the bottom of the OTS at the other end of the rotating shell 10 and discharge them outside the rotating shell 10.

[0153] On the other hand, during normal operation, the opening / closing door 97 is opened to leave the through-hole 96 open, as shown in Figures 24 and 25. This causes most of the material W placed on the second scraping member 95 to pass through the through-hole 96 and leak out in the direction opposite to the rotation direction S of the second scraping member 95. Therefore, the filling rate can be adjusted by preventing the second scraping member 95 from scraping up the material W and adjusting the amount of material W scraped up by the first scraping member 75.

[0154] There is no particular limitation on the method for opening and closing the opening / closing door 97. For example, as shown in Figures 23 to 25, a control rod 98 may be connected to the opening / closing door 97, the outer TS portion of the control rod 98 may be supported by the rotating barrel 10, and the opening / closing door 97 may be rotated by rotating the control rod 98 in the circumferential direction of the control rod 98.

[0155] 24 and 25 show a configuration in which the opening / closing door 97 opens toward the rear in the rotation direction S of the second scraper member 95 (opposite the rotation direction S of the second scraper member 95), but the present invention is not necessarily limited to this configuration. For example, the opening / closing door 97 may be configured to open toward the front in the rotation direction S of the second scraper member 95 (the same direction as the rotation direction S of the second scraper member 95). However, if the opening / closing door 97 opens toward the front in the rotation direction S of the second scraper member 95, depending on the opening degree, there is a possibility that the workpieces W placed on the opening / closing door 97 may be scraped up and discharged from the rotating cylinder 10. Therefore, a configuration in which the opening is toward the rear in the rotation direction S is preferable.

[0156] 23 to 25, the through-hole 96 is provided on the outer side TS of the second scraping member 95, but the present invention is not limited to this. For example, the through-hole 96 may be provided on the inner side BS of the second scraping member 95 in the configuration shown in FIGS.

[0157] In the above description, the second scraper member 85 according to the fifth embodiment and the second scraper member 95 according to the sixth embodiment are combined with the first scraper member 75 according to the fourth embodiment. However, this is not limiting. For example, the second scraper member 85 and the second scraper member 95 according to the sixth embodiment may be combined with any of the first scraper member 60 according to the first embodiment, the first scraper member 61 according to the second embodiment, the first scraper member 73 according to the third embodiment, and the first scraper member 105 according to the seventh embodiment (described later) instead of the first scraper member 75.

[0158] The combination of scraper members is not limited to two types, and may be three or more types. For example, a third scraper member (not shown) may be combined with each of the first scraper members 60, 61, 73, and 75, 105 (described later), and each of the second scraper members 85 and 95. A combination of two types is preferred. A more preferred combination is the first scraper member 75 of the fourth embodiment or the first scraper member 73 of the third embodiment with the second scraper member 85 of the fifth embodiment, or the first scraper member 75 of the fourth embodiment or the first scraper member 73 of the third embodiment with the second scraper member 95 of the sixth embodiment.

[0159] 26 to 29 show a first scraper member 105 according to a seventh embodiment. The first scraper member 105 of the seventh embodiment extends to the inner wall of the rotating barrel 10 and has a through-hole 106 at its tip end TS, and is configured to cover or open the through-hole 106 by opening an opening / closing door 107 rearward in the rotation direction S of the first scraper member 105 (the direction opposite to the rotation direction S).

[0160] The first scraper member 105 is provided between the outer wall of the discharge pipe 51 and the inner wall of the rotating shell 10, and extends from the inside to the outside of the rotating shell 10 in a cross section intersecting with the axis of the rotating shell 10. An inner portion 112 of the first scraper member 105 is located rearward of an outer portion 114 of the first scraper member 105 in the direction of rotation S of the first scraper member 105, and an intermediate portion 113 connecting the inner portion 112 of the first scraper member 105 and the outer portion 114 of the first scraper member 105 extends from rearward to forward in the direction of rotation S of the first scraper member 105.

[0161] The above-described structure makes it possible to form a recess 111 recessed toward the rear of the rotation direction S of the first scraper member 105 inside the first scraper member 105. This recess 111 is located rearward of the outer portion 114 of the first scraper member 105 in the rotation direction S. This recess 111 is formed by connecting the tip end of the inner portion 112 of the first scraper member 105 (the outer portion of the inner portion 112 of the first scraper member 105 in a cross section that intersects with the axis of the rotating shell 10) and the base end of the outer portion 114 of the first scraper member 105 (the inner portion of the outer portion 114 of the first scraper member 105 in a cross section that intersects with the axis of the rotating shell 10) via the intermediate portion 113. The recessed portion 111 is mainly constituted by an inner portion 112 and a middle portion 113 of the first scraping member 105, and may be provided with a side wall 109, which will be described later, as required.

[0162] 27 and 28, the door 107 is opened to open the through-hole 106. This allows most of the material W placed on the outer portion 114 of the first scraping member 105 to pass through the through-hole 106 and leak out in the direction opposite to the rotation direction S of the first scraping member 105. At this time, if a large amount of workpieces W accumulates at the bottom of the rotating shell 10 and the height of the workpieces W accumulated at the bottom of the rotating shell 10 is higher than the height of the upper end of the outer part 114 of the first scraping member 105 (this refers to the end of the inner BS of the first scraping member 105 when the first scraping member 105 is located at the bottom of the rotating shell 10 and the wall surface of the first scraping member 105 is vertical; the same applies below), the inner part 112 and middle part 113 of the first scraping member 105 will scrape up the part of the workpieces W that is higher than the height of the upper end of the outer part 114 of the first scraping member 105, and the scraped-up workpieces W will be temporarily stored in the recessed part 111, and the workpieces W will finally be guided to the opening X. On the other hand, when it is desired to empty the rotating shell 10 by discharging all of the materials W remaining therein, for example, when the operation of the horizontal rotary dryer 1 is terminated, the retractable door 107 is closed to block the through-holes 106 as shown in FIG. 26 . This allows the materials W placed on the first scraping member 105 to be scraped up without leaking out of the through-holes 106. The first scraping member 105 described above allows adjustment of the amount of materials W scraped up. Furthermore, when providing the first scraping member 105, the extension length of the outer portion 114 (the height of the upper end of the outer portion 114) can be set to a desired value, thereby allowing the filling rate of the materials W in the rotating shell 10 to be adjusted to a desired value.

[0163] There is no particular limitation on the method for opening and closing the opening / closing door 107. For example, as shown in Figures 26 to 28, a control rod 108 may be connected to the opening / closing door 107, a tip side TS portion of the control rod 108 may be supported by the rotating barrel 10, and the opening / closing door 107 may be rotated by rotating the control rod 108 in the circumferential direction of the control rod 108.

[0164] 27 and 28 show a configuration in which the opening / closing door 107 opens rearward in the rotation direction S of the first scraping member 105 (opposite the rotation direction S of the first scraping member 105), but this is not necessarily limited to this configuration. For example, the opening / closing door 107 may open forward in the rotation direction S of the first scraping member 105 (the same direction as the rotation direction S of the first scraping member 105). However, if the opening / closing door 107 opens forward in the rotation direction S of the first scraping member 105, depending on the opening angle, there is a possibility that the workpieces W placed on the opening / closing door 107 may be scraped up and discharged from the rotating cylinder 10. Therefore, a configuration in which the opening door opens rearward in the rotation direction S is preferable.

[0165] 26 to 28, the through-hole 106 is provided on the outer side TS of the first scraping member 105, but the present invention is not limited to this. For example, the through-hole 106 may be provided on the inner side BS of the first scraping member 105 in the configuration shown in FIGS.

[0166] It is preferable to provide a side wall 109 on the side surface of the first scraping member 105. Providing this side wall 109 prevents the workpiece W from spilling from the front side in the direction of rotation S of the first scraping member 105 to the side in the direction of rotation S when the first scraping member 105 is rotated, which has the advantage of allowing most of the workpiece W to be guided to the opening X.

[0167] When providing side walls 109, it is preferable to provide side walls 109 on the entire lateral surface of the first scraper 105, i.e., on all lateral surfaces of the inner portion 112, middle portion 113, and outer portion 114 of the first scraper 105. Providing side walls 109 on the entire lateral surface of the first scraper 105 increases the effect of preventing the workpiece W from spilling from the front side of the first scraper 105 in the direction of rotation S to the side in the direction of rotation S. When providing side walls 109 on only a portion of the lateral surface of the first scraper 105, it is preferable to provide side walls 109 on the inner portion 112 rather than the outer portion 114. This is because the workpiece W placed on the front side of the first scraper 105 in the direction of rotation S gradually moves toward the inner side BS of the rotating shell 10 as the first scraper 105 rotates, making it more important to prevent the workpiece W from spilling from the inner portion 112 to the side in the direction of rotation S.

[0168] The length of the side wall 109 in the rotation direction S can be determined arbitrarily, but the longer the length of the side wall 109, the more it can prevent the workpiece W from spilling out from the side. As illustrated in Figures 26 to 29, it is preferable that the length of the side wall 109 of the inner part 112 in the rotation direction S is longer than the length of the side wall 109 of the outer part 114 in the rotation direction.

[0169] (Modification of the Shape of the First Scraping Member) Although not shown, the shape of the first scraping member in the first to fourth embodiments may be the same as the first scraping member 105 in the seventh embodiment. That is, the inner portion of the first scraping member may be located further rearward than the outer portion of the first scraping member in the direction of rotation S of the first scraping member, and an intermediate portion connecting the inner and outer portions of the first scraping member may extend forward from the rear in the direction of rotation S of the first scraping member. By shaping the first scraping member in this way, a recessed portion is formed on the inner side BS of the first scraping member. In this way, when the first scraping member rotates, much of the workpiece W scraped up by the first scraping member can be temporarily accumulated in this recessed portion, thereby increasing the amount of workpiece W discharged into the discharge pipe.

[0170] Specifically, the first to fourth embodiments may be modified as follows.

[0171] (Modification of the First Embodiment) The inner scraper blade 60A is disposed further rearward in the rotation direction S of the first scraper blade 60 than the outer scraper blade 60B, and an intermediate member is newly provided to connect the inner scraper blade 60A and the outer scraper blade 60B.

[0172] (Modification of the second embodiment) The fixed blade 61A is arranged further rearward in the rotation direction S than the rotary blades (outer rotary blade 61B, inner rotary blade 61C, intermediate rotary blade 61D), and a new intermediate member is provided to connect the fixed blade 61A and the rotary blades.

[0173] (Modification of the Third Embodiment) The shape of each of the first scraping members 73A and 73B itself is made the same as the shape of the first scraping member 105 of the seventh embodiment.

[0174] (Modification of the Fourth Embodiment) The first scraping member 75 is disposed further rearward in the rotation direction S than the extension member 76, and an intermediate member is newly provided to connect the first scraping member 75 and the extension member 76.

[0175] (Side Wall of First Scraping Member) As with the first scraping member 105, a side wall may be provided on the supply port side (one end side ITS of the rotating shell 10) of each first scraping member for the workpieces W. By providing this side wall, the workpieces W scraped up by the first scraping member can be prevented from spilling out from the supply port side of the workpieces W, making it easier to guide the workpieces W scraped up by the first scraping member to the opening X.

[0176] Specifically, the first to fourth embodiments may be modified as follows.

[0177] (Modification of the First Embodiment) A side wall is provided on the supply port side (one end side ITS of the rotating shell 10) of the inner scraping blade 60A and the outer scraping blade 60B for the workpiece W. In this case, it is preferable to provide a side wall on both the inner scraping blade 60A and the outer scraping blade 60B, but a side wall may be provided on only one of them. If a side wall is provided on only one of them, it is preferable to provide a side wall on the inner scraping blade 60A in order to make it easier to guide the scraped workpiece W to the opening X.

[0178] (Variation of the second embodiment) Side walls are provided on the supply port side (one end side ITS of the rotating shell 10) of the workpiece W on the fixed blade 61A and the rotating blades (outer rotating blade 61B, inner rotating blade 61C, intermediate rotating blade 61D). In this case, it is preferable to provide side walls on both the fixed blade 61A and the rotating blade, but a side wall may be provided on only one of them. If a side wall is provided on only one of them, it is preferable to provide a side wall on the fixed blade 61A in order to make it easier to guide the scraped-up workpiece W to the opening X. Note that if a side wall is provided on the inner rotating blade 61C, it should be provided so as not to interfere with the side wall of the fixed blade 61A.

[0179] (Modification of the Third Embodiment) A side wall is provided on the supply port side of the first scraping members 73A and 73B for the workpieces W (one end side ITS of the rotating shell 10).

[0180] (Variation of the Fourth Example) A side wall is provided on the supply port side (one end side ITS of the rotating shell 10) of the first scraping member 75 and the extension member 76 for the workpieces W. In this case, it is preferable to provide a side wall on both the first scraping member 75 and the extension member 76, but a side wall may be provided on only one of them. If a side wall is provided on only one of them, it is preferable to provide a side wall on the first scraping member 75 in order to make it easier to guide the scraped-up workpieces W to the opening X.

[0181] 21 to 25, the second scraping member of the fifth and sixth embodiments may be provided with a side wall similar to that of the first scraping member 105. By providing this side wall, it is possible to prevent the workpieces W scraped up by the second scraping member from spilling out from the supply port side of the workpieces W, making it easier to guide the workpieces W scraped up by the second scraping member to the opening X.

[0182] Up to this point, the side walls 109 of the first scraping member and the second scraping member in each of the above embodiments have been described as being provided at one end ITS of the rotating shell 10, but the side walls 109 may also be provided at the other end OTS. Furthermore, providing the side walls 109 at both the one end ITS and the other end OTS is more effective in preventing the scraped-up workpieces W from spilling out.

[0183] In addition, when the other end OTS side of the first scraping member or the second scraping member in each of the above embodiments is not adjacent to any wall on the other end OTS (for example, when there is a certain amount of space between the first scraping member 60 and the end plate inner wall 18 as shown in FIG. 2), it is preferable to provide a side wall 109 on the other end OTS of the first scraping member or the second scraping member. This is because the workpiece W scraped up by the first scraping member or the second scraping member is less likely to spill out of the other end OTS.

[0184] Conversely, if the side surface of the other-end OTS of the first scraping member or the second scraping member in each of the above embodiments is adjacent to some kind of wall on the other-end OTS (for example, as shown in Figures 26 to 28, when there is almost no gap between the first scraping member 105 and the end plate inner wall 18), it is not necessary to provide a side wall 109 on the other-end OTS of the first scraping member or the second scraping member. This is because some kind of wall on the other-end OTS prevents the workpiece W scraped up by the first scraping member or the second scraping member from spilling out of the other-end OTS.

[0185] (Filling rate of workpiece W) The filling rate of workpiece W refers to the value obtained by dividing the volume of workpiece W remaining in the rotating shell 10 by the volume inside the rotating shell 10, and can be calculated using the following formula 1. where η is the packing rate (%), Ap is the cross-sectional area (m ２ ), and Af is the free cross-sectional area (m ２ )

[0186] As an example of a specific calculation method, Ap is calculated by measuring the filling height of the workpieces W inside the rotating shell 10 through an inspection hatch provided at the end of the main body of the horizontal rotary dryer 1. Also, Af can be obtained from a design value. η (filling rate) can be derived by applying the thus-obtained Ap and Af to the above-mentioned calculation formula.

[0187] (Rotation of the first scraper members 60, 61, 73, 75, 105 and the second scraper members 85, 95) In the above explanation, it has been described that the first scraper members 60, 61, 73, 75, 105 according to the first to fourth examples and the seventh example, and the second scraper members 85, 95 according to the fifth and sixth examples rotate. Because the first scraper members 60, 61, 73, 75, 105 according to the first to fourth examples and the seventh example, and the second scraper members 85, 95 according to the fifth and sixth examples are fixed to the discharge pipe 51, when the discharge pipe 51 rotates, the first scraper members 60, 61, 73, 75, 105 and the second scraper members 85, 95 also rotate in the same direction as the discharge pipe 51. Furthermore, because the discharge pipe 51 is fixed to the rotating shell 10, when the rotating shell 10 rotates, the discharge pipe 51 also rotates in the same direction as the rotating shell 10. Therefore, when the rotating shell 10, the discharge pipe 51, the first scraping members 60, 61, 73, 75, 105, and the second scraping members 85, 95 are interconnected, the rotation direction R of the rotating shell 10 and the rotation direction S of the first scraping members 60, 61, 73, 75, 105, and the second scraping members 85, 95 are the same direction.

[0188] (Attachment Positions of First Rake-Up Members 60, 61, 73, 75, 105 and Second Rake-Up Members 85, 95) In the above, the first Rake-Up Members 60, 61, 73, 75, 105 according to the first to fourth and seventh embodiments and the second Rake-Up Members 85, 95 according to the fifth and sixth embodiments are attached to the outer peripheral wall of the discharge pipe 51. However, the present invention is not limited to this. For example, a rotating pipe (not shown) extending in the same direction as the discharge pipe 51 may be provided inside the discharge pipe 51, and the first Rake-Up Members 60, 61, 73, 75, 105 according to the first to fourth and seventh embodiments and the second Rake-Up Members 85, 95 according to the fifth and sixth embodiments may be attached to the rotating pipe.

[0189] (Flow of Workpiece W into Opening X) In the above explanation, it has been described that the workpiece W is scraped up by the first scraping-up members 60, 61, 73, 75, and 105 according to the first to fourth and seventh embodiments, and the second scraping-up members 85 and 95 according to the fifth and sixth embodiments, and that the scraped workpiece W flows into the inside of the discharge pipe 51 through the opening X provided in the discharge pipe 51. The flow of the scraped workpiece W into the discharge pipe 51 occurs in the upper part of the rotating shell 10. For example, in the configurations shown in FIGS. 3 and 4 , the workpiece W on the first scraping-up member 60 flows into the inside of the discharge pipe 51 through the opening X near the first scraping-up member 60 located in the upper right of the drawings.

[0190] 3 and 4 show the rotating shell 10 in a stopped state, i.e., the workpieces W are not moving (are stationary), for ease of understanding. When the rotating shell 10 and the first scraping member 60 rotate from this state, the workpieces W are lifted in the same direction as the rotation direction R of the rotating shell 10 and the rotation direction S of the first scraping member 60. When the rotating shell 10 and the first scraping member 60 rotate in the directions shown in FIGS. 3 and 4, the workpieces W are lifted to the upper right of the drawing, and the workpieces are dispersed in a crescent shape inside the rotating shell 10. This is the same in all of the first to seventh embodiments.

[0191] (Effects of the Invention) As described above, the horizontal rotary dryer 1 according to the present invention has the advantage that the front area of ​​the first scraping member 60 relative to the direction of rotation can be changed, making it easy to adjust the filling rate of the workpieces W in the rotating cylinder 10 to the desired value.

[0192] (Industrial Applicability) The horizontal rotary dryer 1 according to the present invention can be used as a dryer for drying ores such as coal, copper ore, iron powder, and zinc powder, metal-based substances, inorganic substances such as gypsum, alumina, and soda ash, dewatered sludge, and the like.

[0193] 1: horizontal rotary dryer, 10: rotating shell, 11: heating pipe, 17: end plate portion, 18: end plate inner wall, 41: supply port, 51: discharge pipe, 55: discharge casing, 56: exhaust port, 57: discharge port, 60: first scraping member (according to the first embodiment), 60A: inner scraping blade, 60B: outer scraping blade, 60C: fixed member, 60D: protrusion, 61: first scraping member (according to the second embodiment), 61A: fixed blade, 61B: outer rotating blade, 61Ba: outer extending wall, 61Bb: rotation direction extending wall, 61C : inner rotating blade, 61D: intermediate rotating blade, 61Da: outer extending wall, 61Db: rotation direction extending wall, 65: support portion, 65H: through hole, 66: nut, 66H: through hole, 70: control rod, 71: drain discharge pipe, 72: steam supply pipe, 73: first scraper member (according to the third embodiment), 73A: first scraper member, 73B: first scraper member, 74: guide member, 75: first scraper member (according to the fourth embodiment), 76: extension member, 76A: first extension member, 76B: second extension member, 76Q: Corner portion, 76X: outward extending wall, 76Y: first rotation direction extending wall, 76Z: second rotation direction extending wall, 77: connecting hole, 78: bolt, 79: nut, 80: rotation control rod, 85: second scraper member (according to the fifth embodiment), 86: through hole, 87: opening / closing door, 88: control rod, 91: internal steam supply pipe, 92: internal drain discharge pipe, 95: second scraper member (according to the sixth embodiment), 96: through hole, 97: opening / closing door, 98: control rod, 105: first scraper member (according to the seventh embodiment), 106: through hole, 1 07: opening / closing door, 108: control rod, 109: side wall, 110: through hole, 111: recess, 112: inner part (of first scraper member), 113: middle part (of first scraper member), 114: outer part (of first scraper member), A: carrier gas, E: material to be processed, R: rotation direction of the rotating cylinder, S: rotation direction (of first scraper member and second scraper member), W: material to be processed, LD: longitudinal direction (of the rotating cylinder), ITS: one end side, OTS: other end side, RD: radial direction, BS: base end side (inside), TS: tip end side (outside)

Claims

1. A horizontal rotary dryer comprising: a rotating cylinder having a supply port for material to be treated at one end and a discharge port for the material to be treated at the other end and being freely rotatable in a circumferential direction; a discharge pipe connected to the discharge port provided in the center of the other end of the rotating cylinder; and a first scraping member located at the other end of the rotating cylinder, rotating in the circumferential direction of the rotating cylinder, scraping up the material to be treated that has accumulated at the bottom of the other end of the rotating cylinder and directing it into the discharge pipe, wherein the first scraping member is a variable scraping member whose front area in the direction of rotation of the first scraping member can be changed.

2. The horizontal rotary dryer according to claim 1, which has a number of heating tubes inside the rotating cylinder through which a heating medium passes, and is a dryer that indirectly heats and dries the material to be treated by bringing the material into contact with the outer surfaces of the heating tubes as the material moves from one end of the rotating cylinder to the other end.

3. A horizontal rotary dryer as described in claim 1 or 2, wherein a through hole is formed in a part of the first scraping member, and the first scraping member is provided with an opening / closing door capable of blocking the through hole.

4. A horizontal rotary dryer according to claim 3, wherein the opening and closing door is a door that opens to at least one of the front and rear sides in the rotation direction of the first scraping member.

5. A horizontal rotary dryer as described in claim 3, wherein the first scraping member is provided between the outer wall of the discharge pipe and the inner wall of the rotating cylinder, and extends from the inside to the outside of the rotating cylinder at a cross section intersecting the axis of the rotating cylinder, the inner portion of the first scraping member is located rearward of the outer portion of the first scraping member in the direction of rotation of the first scraping member, and an intermediate portion connecting the inner portion of the first scraping member and the outer portion of the first scraping member extends from rearward to forward in the direction of rotation of the first scraping member.

6. A horizontal rotary dryer according to claim 5, wherein the first scraping member has a side wall on at least one of the supply inlet side and the discharge outlet side of the material to be treated.

7. A horizontal rotary dryer as described in claim 1 or 2, wherein the first scraping member has an inner scraping blade provided between the outer wall of the discharge pipe and the inner wall of the rotating cylinder, and extending from the inside to the outside of the rotating cylinder at a cross section intersecting the axis of the rotating cylinder, and an outer scraping blade provided next to the inner scraping blade and capable of moving outward relative to the inner scraping blade, and the extension length of the first scraping member can be changed by moving the outer scraping blade inward or outward.

8. The first scraping member is provided between the outer wall of the discharge pipe and the inner wall of the rotating shell, and has a fixed blade whose base end is fixed directly or indirectly to the peripheral wall of the discharge pipe and extends from the inside to the outside of the rotating shell at a cross section that intersects with the axis of the rotating shell, and a plurality of rotating blades are provided outside the fixed blade and can be connected to the tip ends of the fixed blades; the horizontal rotary dryer has a rotating member having a rotating shaft that extends from the inside to the outside of the rotating shell at a cross section that intersects with the axis of the rotating shell, and the plurality of rotating blades have different lengths extending outward from the rotating shell at a cross section that intersects with the axis of the rotating shell, are each fixed to the rotating member, and rotate in the circumferential direction of the rotating shaft as the rotating member rotates, and it is possible to change the rotating blade connected to the fixed blade by rotating the rotating member.

9. A horizontal rotary dryer as described in claim 1 or 2, wherein with the base end of the first scraper member directly or indirectly attached to the peripheral wall of the discharge pipe, the first scraper member extends from the inside to the outside of the rotating cylinder in a cross section that intersects with the axis of the rotating cylinder, other first scraper members having different lengths extending outwardly of the rotating cylinder in a cross section that intersects with the axis of the rotating cylinder are prepared in advance, and the first scraper member is replaceable with respect to the peripheral wall of the discharge pipe.

10. A horizontal rotary dryer as described in claim 1 or 2, wherein the first scraping member has a base end attached directly or indirectly to the peripheral wall of the discharge pipe, extends from the inside to the outside of the rotating cylinder in a cross section that intersects with the axis of the rotating cylinder, and an extension member can be attached to the tip of the first scraping member to extend the outward extension length of the rotating cylinder in the cross section that intersects with the axis of the rotating cylinder.

11. A horizontal rotary dryer as claimed in claim 1 or 2, wherein the first scraping member extends radially outward from the outer wall of the discharge pipe.

12. The horizontal rotary dryer according to claim 1 or 2, further comprising a second scraping member located at the other end of the rotating shell, rotating in the circumferential direction of the rotating shell, scraping up the material to be treated accumulated at the bottom of the other end of the rotating shell and guiding it to the inside of the discharge pipe, a through hole being formed in a part of the second scraping member, and a door that can be opened and closed to cover the through hole being provided in the second scraping member.

13. A horizontal rotary dryer according to claim 12, wherein the opening and closing door is a sliding door that can move inward and outward of the rotating cylinder in a cross section that intersects with the axis of the rotating cylinder.

14. A horizontal rotary dryer according to claim 12, wherein the opening and closing door is a door that opens to at least one of the front and rear sides in the rotation direction of the second scraping member fixed to the discharge pipe.

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