JP2011064386A - Rotary kiln - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary kiln in which an excess stress due to a difference in coefficients of thermal expansion, is hardly applied to a retort from ring members, surely retaining the retort, and easily performing a mounting work of the ring members. <P>SOLUTION: This rotary kiln 1 includes the cylindrical retort 2, and the ring members 8F, 8R disposed on the outer peripheral face of the retort 2. Each of the ring members 8F, 8R includes an outer ring 80, three or more retainers 81 having inner peripheral faces kept into contact with the outer peripheral face of the retort 2 and arranged in the circumferential direction, connecting members 82 each elastically connecting the adjacent retainers 81 and annularly surrounding the outer peripheral face of the retort 2 with the retainers 81, and the clearance gap 83 defined between the outer ring 80 and the retainers 81. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotary kiln that heat-treats a workpiece while being conveyed in the axial direction.

  The rotary kiln includes a cylindrical retort and a gantry. The retort is arranged substantially horizontally. A ring-shaped tire is disposed on the outer peripheral surface of the retort. On the other hand, a roller is disposed on the gantry. By rolling the tire on the roller, the retort can be rotated about its axis.

  Retorts and tires are generally made of metal such as SUS (stainless steel). For this reason, a tire can be easily attached to a retort. However, depending on the characteristics of the object to be processed, a non-metallic retort such as ceramic or carbon may be used. In this case, it is difficult to attach the tire to the retort. Further, excessive stress may be applied from the tire to the retort due to the difference between the thermal expansion coefficient of the retort and the thermal expansion coefficient of the tire.

  Therefore, Patent Document 1 introduces a rotary kiln capable of suppressing the stress applied to the retort due to the difference in thermal expansion coefficient. In FIG. 11, the radial direction sectional drawing of the rotary kiln described in the literature is shown. As shown in FIG. 11, the rotary kiln 100 includes a retort 101, a tire 102, and a pair of rollers 103. The retort 101 is made of ceramic and has a cylindrical shape. The tire 102 is disposed on the outer peripheral surface of the retort 101.

  The tire 102 includes an outer ring 102a, three spring members 102b, and a gap 102c. The outer ring 102a has a ring shape. A guide rib 104 is disposed on the inner peripheral surface of the outer ring 102a. The guide rib 104 extends in the circumferential direction. The gap 102c is partitioned between the inner peripheral surface of the outer ring 102a and the outer peripheral surface of the retort 101. The spring member 102b has an M shape. A pair of guided pieces 105 are arranged on both ends of the M-shape of the spring member 102b. The guided piece 105 is in sliding contact with the guide rib 104. The two M-shaped top portions of the spring member 102 b are in elastic contact with the outer peripheral surface of the retort 101.

JP 2006-250475 A

  According to the rotary kiln 100 of Patent Document 1, a gap 102 c is defined between the inner peripheral surface of the outer ring 102 a and the outer peripheral surface of the retort 101. For this reason, even if the outer ring 102a and the retort 101 are deformed by heat, the gap 102c can absorb the deformation amount. Therefore, it is difficult to apply excessive stress from the tire 102 to the retort 101.

  However, according to the rotary kiln 100 described in the same document, the three spring members 102 b are not arranged continuously in the circumferential direction of the retort 101. For this reason, it is also conceivable that the retort 101 is disengaged from the restraint by the three spring members 102b. In this case, for example, the retort 101 and the guided piece 105 may interfere with each other.

  Further, according to the rotary kiln 100 described in the document, the mounting work of the tire 102 is complicated. That is, when attaching the tire 102, the tire 102 is first arranged on the radially outer side of the retort 101, then a total of six guided pieces 105 are slid with respect to the guide rib 104, and finally the central axis of the tire 102 And the central axis of the retort 101 need to match. For this reason, the attaching operation | work of the tire 102 is complicated.

  The rotary kiln of the present invention has been completed in view of the above problems. The present invention makes it difficult to apply excessive stress due to a difference in thermal expansion coefficient from a ring member such as a tire, a sprocket, or a gear to the retort. The purpose is to provide.

  (1) In order to solve the above-described problem, a rotary kiln according to the present invention includes a cylindrical retort that is disposed substantially horizontally and is rotatable about an axis, and a ring member that is disposed on an outer peripheral surface of the retort. In the rotary kiln, the ring member includes an outer ring, three or more holders that are arranged in the circumferential direction and have an inner peripheral surface that contacts the outer peripheral surface of the retort, and adjacent holders A connecting member that elastically connects the outer periphery of the retort together with the holder, and a gap defined between the outer ring and the holder. 1).

  According to the rotary kiln of the present invention, a gap is defined between the outer ring and the holder. For this reason, even if the outer ring and the retort are deformed by heat, the gap can absorb the deformation amount. Accordingly, due to the difference between the thermal expansion coefficient of the retort and the thermal expansion coefficient of the ring member, it is difficult for excessive stress to be applied from the ring member to the retort.

  Moreover, according to the rotary kiln of this invention, the retort is enclosed from the radial direction outer side by the ring formed by a holder and a connection member being continued. For this reason, a retort can be hold | maintained reliably. Three or more holders are arranged. Even in this respect, the retort can be reliably held.

  Moreover, according to the rotary kiln of this invention, a ring member can be attached to a retort by connecting adjacent holders with a connection member. For this reason, the attachment work of a ring member is easy.

  (2) Preferably, in the configuration of (1), the ring member may be a tire that is mounted on a roller so as to be able to roll (corresponding to claim 2). According to this configuration, it is difficult to apply excessive stress from the tire to the retort due to the difference between the thermal expansion coefficient of the retort and the thermal expansion coefficient of the tire. Moreover, according to this structure, a retort can be hold | maintained reliably. Further, according to this configuration, the tire mounting operation is simple. Moreover, according to this structure, the stability of the tire with respect to a retort is high.

  (3) Preferably, in the configuration of the above (1) or (2), the retort should have a cylindrical shape (corresponding to claim 3). According to this configuration, the inner peripheral surface of the holder is difficult to slip relative to the outer peripheral surface of the retort. The reason will be described below.

  That is, generally, the outer peripheral surface of a cylindrical retort is designed in a perfect circle (specifically, the outer peripheral surface (outer peripheral line) in the radial cross section of the retort is a perfect circle). Similarly, the inner peripheral surface of the ring member is also designed to be a perfect circle. If both members are produced as designed, the ring member will be in surface contact with the retort over the entire circumference. For this reason, the inner peripheral surface of the holder is less likely to slip relative to the outer peripheral surface of the retort.

  However, in reality, the retort may not be produced as designed, and the roundness of the retort may be low. For example, the outer surface of the retort after production may be elliptical. In this case, the perfect circular ring member comes into contact with the elliptical retort at two locations. For this reason, the inner peripheral surface of the holder is easily slipped with respect to the outer peripheral surface of the retort.

  In this regard, according to this configuration, the inner peripheral surface of the holder comes into contact with the outer peripheral surface of the retort at least at three locations (the more the number of holders arranged, the more contact locations). That is, even if the outer peripheral surface of the retort is a perfect circle, oval, oval, irregular shape, etc., it is held against the outer surface of the retort regardless of the shape of the outer surface of the retort. The inner peripheral surface of the tool abuts at least at three locations. For this reason, the inner peripheral surface of the holder is less likely to slip relative to the outer peripheral surface of the retort.

  Further, when the number of holders arranged is two or less, the inner peripheral surface of the holder may abut against the outer peripheral surface of the retort at two locations. In this case, it is also conceivable that the ring member wobbles with respect to the retort around the virtual axis connecting the two contact portions. Thus, when the number of arrangement | positioning of a holder is two or less, the stability of the ring member with respect to a retort is low. In this regard, according to the present configuration, the number of holders arranged is three or more. For this reason, the stability of the ring member with respect to a retort is high.

  (4) Preferably, in the configuration of (3), the holder has flexibility, and the curvature of the inner peripheral surface of the holder in a natural state and the design curvature of the outer peripheral surface of the retort. Are preferably different from each other (corresponding to claim 4).

  That is, this structure does not make the curvature of the inner peripheral surface of the holder in a natural state (unconstrained state) before attachment coincide with the design curvature of the outer peripheral surface of the retort. According to this structure, when attaching a holder, a holder is elastically deformed so that the shape of the inner peripheral surface of a holder may follow the shape of the outer peripheral surface of a retort. For this reason, the inner peripheral surface of a holder can be elastically contacted with the outer peripheral surface of a retort using the restoring force by the said elastic deformation. Therefore, the inner peripheral surface of the holder becomes more difficult to slip with respect to the outer peripheral surface of the retort.

  (5) Preferably, in the configuration of the above (3) or (4), it is preferable that three of the holders are arranged (corresponding to claim 5). The greater the number of holders arranged, the greater the number of contact points of the inner peripheral surface of the holder with the outer peripheral surface of the retort. For this reason, the inner peripheral surface of the holder becomes more difficult to slip with respect to the outer peripheral surface of the retort. On the other hand, as the number of holders arranged increases, the number of parts of the ring member increases. For this reason, the structure of the ring member is complicated.

  In this respect, according to the present configuration, only three holders are arranged. That is, as many holders as possible can be stably installed on the retort. For this reason, the number of parts of the ring member can be reduced while ensuring the stability of the ring member. Further, the structure of the ring member can be simplified.

  (6) Preferably, in any one of the above configurations (1) to (5), the ring member is further disposed in the gap and is supported by the outer ring so as to be swingable. It is better to have a link arm having an inner end that is swingably supported by the tool (corresponding to claim 6).

  According to this configuration, the holder can be swung together with the inner end of the link arm around the outer end of the link arm. For this reason, the radial direction position of a holder can be adjusted. Moreover, according to this structure, a holder can be rock | fluctuated centering | focusing on the inner end of a link arm. For this reason, the angle of the inner peripheral surface of the holder can be adjusted. Thus, according to this structure, the adaptability of the holder to the shape, curvature, diameter, etc. of the outer peripheral surface of the retort is enhanced.

  In particular, when this configuration is combined with any one of the above configurations (3) to (5), the mounting operation of the ring member is simplified. For example, when the roundness of the retort is low and the roundness of the ring member is high, in order to suppress slippage of the ring member after mounting, while searching for an angle that increases the contact area between the ring member and the retort (for example, It is necessary to attach the ring member while rotating the ring member relative to the retort. For this reason, the attachment work of a ring member is complicated.

  On the other hand, in the case of this configuration, the holder can be freely moved by the link arm. For this reason, it is not necessary to attach a ring member, searching for the angle which the contact area of a holder and a retort becomes large. Therefore, the attaching operation of the ring member is simple.

  (7) Preferably, in any one of the configurations (1) to (6), the retort is preferably made of ceramic (corresponding to claim 7). A ceramic retort is produced by first forming and then firing. The retort immediately after molding and before firing is soft. For this reason, it is difficult to maintain the molded shape. For this reason, for example, the retort may be deformed due to its own weight or the like. In this case, the retort is fired with the deformed shape. Therefore, the surface accuracy (reproducibility of the actual surface with respect to the design surface) of the outer peripheral surface of the retort after firing is lowered.

  In this regard, according to the rotary kiln of the present invention, the inner peripheral surface of the holder comes into contact with the outer peripheral surface of the retort at least at three locations regardless of the surface accuracy of the outer peripheral surface of the retort. For this reason, a retort can be hold | maintained reliably.

  Moreover, according to the rotary kiln of the present invention, a gap is defined between the outer ring and the holder. For this reason, it is difficult to apply excessive stress due to the difference in thermal expansion coefficient from the ring member to the ceramic retort.

  In particular, when this configuration is combined with any one of the above configurations (3) to (5), even if the roundness of the outer peripheral surface of the retort after firing is low, the outer peripheral surface of the retort The inner peripheral surface of the holder comes into contact with at least three places. For this reason, the inner peripheral surface of the holder is less likely to slip relative to the outer peripheral surface of the retort.

  According to the present invention, it is difficult for excessive stress due to a difference in thermal expansion coefficient to be applied to a retort from a ring member such as a tire, a sprocket, or a gear. Can be provided.

It is a perspective view of the rotary kiln of a first embodiment. It is a disassembled perspective view of the rotary kiln. It is a perspective view near the tire ahead of the rotary kiln. It is a disassembled perspective view of the tire vicinity. It is radial direction sectional drawing of the tire vicinity. It is a disassembled perspective view of the connection member vicinity arrange | positioned above the tire. It is radial direction sectional drawing of the tire vicinity ahead of the rotary kiln when the outer peripheral surface of a retort is elliptical. It is radial direction sectional drawing of the tire vicinity ahead of the rotary kiln of 2nd embodiment. It is radial direction sectional drawing of the tire vicinity ahead of the rotary kiln of 3rd embodiment. It is a disassembled perspective view of the connection member arrange | positioned upwards of the tire ahead of the rotary kiln of 4th embodiment. It is radial direction sectional drawing of the conventional rotary kiln.

  Hereinafter, embodiments of the rotary kiln of the present invention will be described.

<First embodiment>
[Composition of rotary kiln]
First, the structure of the rotary kiln of this embodiment is demonstrated. In FIG. 1, the perspective view of the rotary kiln of this embodiment is shown. FIG. 2 shows an exploded perspective view of the rotary kiln. As shown in FIGS. 1 and 2, the rotary kiln 1 mainly includes a retort 2, a screw feeder 3, an upstream hood 4, a hopper 5, and a heating unit 6 (see FIG. And a downstream hood 7, a pair of front and rear tires 8 </ b> F and 8 </ b> R, and a gantry 9.

  As shown by a thick dotted line in FIG. 1, the workpiece is put into the hopper 5 from the outside. The thrown object to be processed passes through each member in the order of screw feeder 3 → retort 2 → downstream hood 7 → rotary valves 71 and 72. And it is paid out to the outside. When passing through the inside of the retort 2, a predetermined heat treatment is performed on the workpiece by the heat from the heating unit 6.

(Stand 9)
The gantry 9 has a desk shape. The gantry 9 includes a pair of rollers 90L and 90R, a pair of rollers 91L and 91R, and a pair of bearing portions 92. These members are arranged side by side in the front-rear direction on the top surface of the gantry 9.

  The pair of rollers 90 </ b> L and 90 </ b> R is disposed on the front edge of the upper surface of the gantry 9. The rotating shafts of the rollers 90L and 90R each extend in the front-rear direction. The pair of rollers 90L and 90R are arranged side by side in the left-right direction. The pair of rollers 91 </ b> L and 91 </ b> R is disposed slightly behind the center of the top surface of the gantry 9. The rotation shafts of the pair of rollers 91L and 91R each extend in the front-rear direction. The pair of rollers 91L and 91R are arranged side by side in the left-right direction. The pair of bearing portions 92 are disposed near the rear edge of the upper surface of the gantry 9. The pair of bearing portions 92 are arranged side by side in the front-rear direction. The shaft through holes of the pair of bearing portions 92 are arranged coaxially in the front-rear direction.

(Retort 2)
The retort 2 is made of ceramic and has a cylindrical shape extending in the front-rear direction. The outer peripheral surface of the retort 2 has a perfect circle shape. The sprocket 24 is made of steel and is provided behind the tire 8R in the retort 2. When the driving force from the driving device (not shown) is transmitted to the sprocket 24, the retort 2 can rotate around the axis on the rollers 90L and 90R and the rollers 91L and 91R. In addition, although the retort 2 is arrange | positioned substantially horizontal, in order to make a to-be-processed object flow, strictly, it inclines slightly downward toward the front from back.

(Heating unit 6, downstream hood 7, upstream hood 4)
The heating unit 6 has a rectangular parallelepiped box shape. A heater (not shown) is disposed on the inner surface of the heating unit 6. The retort 2 penetrates the heating unit 6 in the front-rear direction. A substantially central portion of the retort 2 in the axial direction (front-rear direction) is accommodated in the heating unit 6.

  The upper part of the downstream hood 7 has a rectangular parallelepiped box shape, and the lower part has a quadrangular pyramid box shape pointed downward. A retort insertion hole 70 is formed in the rear wall of the upper portion of the downstream hood 7. The retort insertion hole 70 accommodates the front end of the retort 2. A sliding seal member (not shown) is interposed between the hole edge of the retort insertion hole 70 and the outer peripheral surface of the retort 2. Below the downstream hood 7, rotary valves 71 and 72 are connected in the vertical direction.

  The upstream hood 4 has a hollow cylindrical shape. A retort insertion hole 40 is formed in the front wall of the upstream hood 4. The retort insertion hole 40 accommodates the rear end of the retort 2. A sliding seal member (not shown) is interposed between the hole edge of the retort insertion hole 40 and the outer peripheral surface of the retort 2. A supply pipe insertion hole 41 is formed in the rear wall of the upstream hood 4.

(Screw feeder 3, hopper 5)
The screw feeder 3 includes a supply pipe 30 (shown in a transparent manner in FIG. 2), a shaft 31, and a screw 32. The supply pipe 30 has a cylindrical shape extending in the axial direction (front-rear direction). The supply pipe 30 is inserted into the supply pipe insertion hole 41 of the upstream hood 4 and fixed. The front end of the supply pipe 30 is opened inside the retort 2.

  The shaft 31 has a round bar shape. The shaft 31 is coaxially arranged inside the supply pipe 30 in the radial direction. The rear end of the shaft 31 protrudes behind the supply pipe 30. The rear end of the shaft 31 is rotatably supported by the pair of bearing portions 92.

  A sprocket 311 is provided between the pair of bearing portions 92 at the rear end of the shaft 31. A driving force (rotational force) is transmitted from the outside to the shaft 31 via the sprocket 311.

  The screw 32 has a spiral shape. The screw 32 is housed inside the supply pipe 30 in the radial direction together with the shaft 31. The screw 32 is provided around the outer peripheral surface of the shaft 31. Due to the rotational force transmitted to the shaft 31 via the sprocket 311, the screw 32 rotates around the axis of the shaft 31 together with the shaft 31.

  The hopper 5 is a hopper with an upper lid, and the upper portion has a cylindrical shape and the lower portion has a conical box shape that is pointed downward. The hopper 5 is fixed above the supply pipe 30. An object to be processed is stored in the hopper 5.

(Tire 8F, 8R)
The tire 8 </ b> F is disposed on the outer peripheral surface near the front end of the retort 2. The tire 8F is mounted on the pair of rollers 90L and 90R so as to be able to roll. The tire 8R is disposed on the outer peripheral surface near the rear end of the retort 2. The tire 8R is mounted on the pair of rollers 91L and 91R so as to be able to roll.

  The pair of front and rear tires 8F and 8R are arranged symmetrically in the front-rear direction. The configuration of the tires 8F and 8R is the same. Therefore, here, only the tire 8F will be described, and the tire 8R will also be described.

  FIG. 3 is a perspective view of the vicinity of the tire in front of the rotary kiln of the present embodiment. FIG. 4 shows an exploded perspective view of the vicinity of the tire. FIG. 5 shows a radial sectional view of the vicinity of the tire. In FIG. 4, the retort 2 is shown through. As shown in FIGS. 3 to 5, the tire 8 </ b> F includes an outer ring 80, three holders 81, three connecting members 82, a gap 83, and three link arms 84.

  The outer ring 80 is made of steel and has a perfect circular ring shape. An outer end mounting hole 800 is formed in the front surface of the outer ring 80. A total of three outer end mounting holes 800 are arranged spaced apart by 120 ° in the circumferential direction. The center axis A1 of the outer ring 80 and the center axis A2 of the retort 2 substantially coincide.

  The holder 81 is made of steel and has a partial arc shape. As shown by a thin line in FIG. 5, the curvature of the inner peripheral surface of the holder 81 in a natural state before being attached to the retort 2 is set larger than the design curvature of the outer peripheral surface of the retort 2. For this reason, the holder 81 is attached to the outer peripheral surface of the retort 2 in a spread state (in a state where the curvature is reduced). The inner peripheral surface of the holder 81 is in line contact with the outer peripheral surface of the retort 2. That is, the three holders 81 are in line contact with the retort 2 at three points separated by approximately 120 °. An inner end attaching portion 810 is disposed substantially at the center in the circumferential direction of the holder 81. The inner end mounting portion 810 has an inner end mounting hole 810a. Both ends in the circumferential direction of the holder 81 are bent outward in the radial direction. A connecting portion 811 is formed in each of the pair of bent portions. The gap 83 is defined between the inner peripheral surface of the outer ring 80 and the outer peripheral surface of the holder 81.

  The link arm 84 is made of steel and has a thin plate shape. The link arm 84 connects the outer ring 80 and the holder 81 in the radial direction. A total of three link arms 84 are arranged. The link arm 84 includes an outer end 840 and an inner end 841. An outer end hole 840 a is formed in the outer end 840. The outer end hole 840a is aligned with the outer end mounting hole 800 of the outer ring 80 in the front-rear direction. The outer end pin member 85 is inserted into the outer end hole 840a and the outer end mounting hole 800. Therefore, the link arm 84 can swing around the outer end pin member 85. The inner end 841 has an inner end hole 841a. The inner end hole 841a is aligned with the inner end mounting hole 810a of the holder 81 in the front-rear direction. An inner end pin member 86 is inserted into the inner end hole 841a and the inner end mounting hole 810a. Therefore, the holder 81 can swing around the inner end pin member 86.

  The connecting member 82 connects the holders 81 adjacent in the circumferential direction. That is, the three connecting members 82 and the three holders 81 are alternately connected to surround the retort 2 from the radially outer side. FIG. 6 shows an exploded perspective view of the vicinity of the connecting member disposed above the tire in front of the rotary kiln of the present embodiment. As shown in FIG. 6, the connecting member 82 includes a bolt 820, a nut 821, washer rings 822 to 824, and a coil spring 825. A connecting hole 811 a is formed in the connecting portion 811 of the holder 81. The bolt 820 passes through a pair of adjacent connecting holes 811a from the right side to the left side. The nut 821 is screwed to the penetrating end (left end) of the bolt 820. The washer ring 822 is interposed between the head of the bolt 820 and the right connecting portion 811. The washer rings 823 and 824 are connected to the right side of the nut 821. The coil spring 825 is interposed between the washer ring 823 and the left connecting portion 811. The coil spring 825 accumulates a biasing force in the extension direction by fastening the bolt 820 and the nut 821. That is, the coil spring 825 biases the left connecting portion 811 to the right side. In other words, the urging force of the coil spring 825 acts in a direction that brings the pair of left and right connecting portions 811 closer to each other.

[Tire mounting method]
Next, a tire mounting method of the rotary kiln of the present embodiment will be described. As shown in FIG. 5, in attaching the tire 8 </ b> F, first, a relatively large space is secured on the radially inner side of the three holders 81 by swinging the link arm 84 radially outward. Next, the tire 8 </ b> F is disposed on the radially outer side of the retort 2. Then, the holders 81 adjacent in the circumferential direction are connected by the connecting member 82. In this way, the tire 8F is mounted on the retort 2.

[Motion when the outer surface of the retort is elliptical]
Next, the movement of the rotary kiln of the present embodiment when the outer peripheral surface of the retort is elliptical will be described. FIG. 7 shows a radial cross-sectional view of the vicinity of the tire in front of the rotary kiln of the present embodiment when the outer peripheral surface of the retort is elliptical. FIG. 7 corresponds to FIG.

  As shown in FIG. 7, the outer peripheral surface of the retort 2 has an elliptical shape that is crushed in the vertical direction. In addition, what is shown with a dashed-dotted line in FIG. 7 is the shape (perfect circle shape) of the retort 2 of FIG. The curvature of the upper and lower sections of the outer peripheral surface of the retort 2 is smaller than the perfect circle. The curvature of the left and right sections of the outer peripheral surface of the retort 2 is larger than the perfect circle. The three holders 81 cover the outer peripheral surface of the retort 2 from the three directions of lower, upper right, and upper left. Among these, the curvature of the inner peripheral surface of the lower holding tool 81 and the curvature of the lower section of the outer peripheral surface of the retort 2 are approximated. Therefore, the lower holding tool 81 is in surface contact with the retort 2 with a relatively large area. The upper right holding tool 81 and the upper left holding tool 81 are in line contact with the retort 2. Further, the coil spring 825 of the connecting member 82 expands and contracts according to the entire circumferential length of the outer peripheral surface of the retort 2.

  Thus, even if the outer peripheral surface of the retort 2 is elliptical, the inner peripheral surfaces of the three holders 81 are firmly in contact with the outer peripheral surface of the retort 2. Further, the center axis A1 of the outer ring 80 and the center axis A2 of the retort 2 substantially coincide with each other.

[Tire movement when retort and tire are thermally deformed]
Next, the movement of the rotary kiln of the present embodiment when the retort and the tire are thermally deformed will be described. As shown in FIG. 5, when the outer ring 80 thermally expands inward in the radial direction, the gap 83 can block the stress from being applied from the outer ring 80 to the holder 81. Moreover, when the retort 2 thermally expands radially outward, the deformation can be absorbed by the coil spring 825 of the connecting member 82 contracting. Further, the deformation of the retort 2 can be absorbed by the gap 83. Further, when the holder 81 is thermally expanded in the circumferential direction, the deformation can be absorbed by the coil spring 825 of the connecting member 82 extending. Also, as shown in FIG. 4, when the relative positional relationship between the outer end mounting hole 800 of the outer ring 80 and the inner end mounting hole 810a of the holder 81 changes due to thermal deformation, the link arm 84 swings. The change can be absorbed by moving.

[Function and effect]
Next, the effect of the rotary kiln of this embodiment is demonstrated. According to the rotary kiln 1 of the present embodiment, the gap 83 is defined between the outer ring 80 and the holder 81 as shown in FIG. For this reason, even if the outer ring 80 and the retort 2 are deformed by heat, the gap 83 can absorb the deformation amount. Therefore, due to the difference between the thermal expansion coefficient of the retort 2 and the thermal expansion coefficient of the tires 8F and 8R, it is difficult for excessive stress to be applied to the retort 2 from the tires 8F and 8R. A gap is also defined between the inner peripheral surface of the holder 81 and the outer peripheral surface of the retort 2. Also in this respect, it is difficult to apply excessive stress to the retort 2.

  Moreover, according to the rotary kiln 1 of this embodiment, as shown in FIG. 5, the retort 2 is enclosed from the radial direction outer side by the ring in which the three holders 81 and the three connection members 82 are formed alternately. It is. For this reason, the retort 2 can be reliably held.

  Further, according to the rotary kiln 1 of the present embodiment, the tires 8F and 8R can be attached to the retort 2 by connecting the adjacent holding members 81 with the connecting member 82. For this reason, the attaching work of the tires 8F and 8R is simple.

  Further, according to the rotary kiln 1 of the present embodiment, the inner peripheral surface of the holder 81 abuts on the outer peripheral surface of the retort 2 at at least three locations. That is, even if the shape of the outer peripheral surface of the retort 2 is a perfect circle shown in FIG. 5 or an elliptical shape shown in FIG. The inner peripheral surface of the holder 81 abuts on the surface at at least three locations. For this reason, the inner peripheral surface of the holder 81 is less likely to slip relative to the outer peripheral surface of the retort 2. Moreover, according to the rotary kiln 1 of this embodiment, the number of arrangement | positioning of the holder 81 is three. For this reason, the stability of the tires 8F and 8R with respect to the retort 2 is high.

  Further, according to the rotary kiln 1 of the present embodiment, the curvature of the inner peripheral surface of the holder 81 in the natural state and the design curvature of the outer peripheral surface of the retort 2 do not match. For this reason, when attaching the holder 81, the holder 81 is elastically deformed so that the shape of the inner peripheral surface of the holder 81 follows the shape of the outer peripheral surface of the retort 2. Therefore, the inner peripheral surface of the holder 81 can be brought into elastic contact with the outer peripheral surface of the retort 2 using the restoring force due to the elastic deformation. Also in this respect, the rotary kiln 1 of the present embodiment is less likely to slip the inner peripheral surface of the holder 81 with respect to the outer peripheral surface of the retort 2.

  Further, according to the rotary kiln 1 of the present embodiment, the holder 81 can be swung together with the inner end 841 of the link arm 84 around the outer end 840 of the link arm 84. For this reason, the radial direction position of the holder 81 can be adjusted. Further, according to the rotary kiln 1 of the present embodiment, the holder 81 can be swung around the inner end 841 of the link arm 84. For this reason, the angle of the inner peripheral surface of the holder 81 can be adjusted. Thus, according to the rotary kiln 1 of this embodiment, the adaptability of the holder 81 to the curvature and diameter of the outer peripheral surface of the retort 2 is increased.

  Further, according to the rotary kiln 1 of the present embodiment, the holder 81 can be freely moved by the link arm 84. For this reason, it is not necessary to attach the tires 8F and 8R while searching for an angle at which the contact area between the holder 81 and the retort 2 increases. Also in this respect, the attaching work of the tires 8F and 8R is simple.

  Further, according to the rotary kiln 1 of the present embodiment, only three holders 81 are arranged. For this reason, the number of parts of the tires 8F and 8R can be reduced while ensuring the stability of the tires 8F and 8R. Moreover, the structure of the tires 8F and 8R can be simplified.

  Further, according to the rotary kiln 1 of the present embodiment, the three holders 81 are swingably supported by the three link arms 84 having the same length. For this reason, the central axis A1 of the outer ring 80 and the central axis A2 of the retort 2 can be easily matched regardless of the shape of the retort 2.

  The retort 2 is made of ceramic. For this reason, as shown in FIG. 7, it is easy to deform | transform into an ellipse. However, according to the rotary kiln 1 of the present embodiment, the inner peripheral surface of the holder 81 comes into contact with the outer peripheral surface of the retort 2 at least at three locations regardless of the roundness of the outer peripheral surface of the retort 2. For this reason, the inner peripheral surface of the holder 81 is less likely to slip relative to the outer peripheral surface of the retort 2.

<Second embodiment>
The difference between the rotary kiln of this embodiment and the rotary kiln of the first embodiment is that the curvature of the inner peripheral surface of the holder in the natural state is set smaller than the design curvature of the outer peripheral surface of the retort. Here, only differences will be described.

  FIG. 8 shows a radial cross-sectional view of the vicinity of the tire in front of the rotary kiln of the present embodiment. In addition, about the site | part corresponding to FIG. 5, it shows with the same code | symbol. As shown by thin lines in FIG. 8, the curvature of the inner peripheral surface of the holder 81 in the natural state before being attached to the retort 2 is set smaller than the design curvature of the outer peripheral surface of the retort 2. For this reason, the holder 81 is attached to the outer peripheral surface of the retort 2 in a narrowed state (in a state where the curvature is increased).

  The rotary kiln of the present embodiment has the same operational effects as the rotary kiln of the first embodiment with respect to the parts having the same configuration. As in the rotary kiln of the present embodiment, the curvature of the inner peripheral surface of the holder 81 in the natural state may be set smaller than the design curvature of the outer peripheral surface of the retort 2.

<Third embodiment>
The difference between the rotary kiln of this embodiment and the rotary kiln of the first embodiment is that the number of holders, connecting members, and link arms arranged is six. Here, only differences will be described.

  FIG. 9 shows a radial cross-sectional view of the vicinity of the tire in front of the rotary kiln of the present embodiment. In addition, about the site | part corresponding to FIG. 5, it shows with the same code | symbol. As shown in FIG. 9, the retort 2 is surrounded by a total of six holders 81. The holder 81 and the outer ring 80 are connected by a link arm 84. Adjacent holders 81 are connected by a connecting member 82.

  The rotary kiln of the present embodiment has the same operational effects as the rotary kiln of the first embodiment with respect to the parts having the same configuration. According to the rotary kiln of the present embodiment, the inner peripheral surface of the holder 81 is in contact with the outer peripheral surface of the retort 2 at six locations. That is, even if the outer peripheral surface of the retort 2 is a perfect circle, or is oval, oval, irregular, etc., the outer surface of the retort 2 is not affected by the shape of the outer peripheral surface of the retort 2. Thus, the inner peripheral surface of the holder 81 comes into contact with at least six locations. For this reason, the inner peripheral surface of the holder is less likely to slip relative to the outer peripheral surface of the retort 2.

<Fourth embodiment>
The difference between the rotary kiln of the present embodiment and the rotary kiln of the first embodiment is only the configuration of the connecting member. Here, only differences will be described. FIG. 10 is an exploded perspective view of the vicinity of the connecting member disposed above the tire in front of the rotary kiln of the present embodiment. In addition, about the site | part corresponding to FIG. 6, it shows with the same code | symbol.

  As shown in FIG. 10, the connecting member 82 includes a coil spring 826 in addition to the coil spring 825. The coil spring 826 is interposed between adjacent connecting portions 811.

  The rotary kiln of the present embodiment has the same operational effects as the rotary kiln of the first embodiment with respect to the parts having the same configuration. According to the rotary kiln of the present embodiment, the urging force can be applied not only in the direction in which the interval between the adjacent holders 81 is narrowed but also in the direction in which it is expanded. For this reason, the circumferential total length of the ring formed by the holder 81 and the connecting member 82 can be elastically adjusted based on the position where the urging forces of the two coil springs 825 and 826 are balanced.

<Others>
The embodiment of the rotary kiln of the present invention has been described above. However, the embodiment is not particularly limited to the above embodiment. Various modifications and improvements that can be made by those skilled in the art are also possible.

  For example, a rubber member may be arranged instead of the coil springs 825 and 826 of the connecting member 82. The retort 2 may be made of carbon or steel. Further, the curvature of the inner peripheral surface of the holder 81 in the natural state is not particularly limited. For example, the inner peripheral surface of the holder 81 may be planar. Further, a reverse curvature may be provided on the inner peripheral surface of the holder 81 so that the center of curvature is disposed on the radially outer side of the retort 2.

  The rotary kiln of the present invention is particularly suitable for being embodied as a rotary kiln 1 having a ceramic retort 2 having an inner diameter of 150 mm or more. The reason is that when the inner diameter is 150 mm or more, the roundness rapidly decreases.

  Moreover, in the said embodiment, although the tires 8F and 8R were used as the ring member of this invention, the sprocket 24 is good also as a ring member of this invention. In this case, the teeth of the outer peripheral surface of the sprocket 24 may be formed on the outer peripheral surface of the outer ring 80 shown in FIG. A gear may be used as the ring member of the present invention.

  Moreover, in the said embodiment, although the cylindrical retort 2 was used, the shape of the retort 2 is not specifically limited. For example, a square tubular retort may be used. In this case, it is preferable to arrange four holders 81 for each flat portion of the outer peripheral surface of the retort. Moreover, you may use a hexagonal cylindrical retort. In this case, it is preferable to arrange six holders 81 for each plane portion of the outer peripheral surface of the retort. In addition, when two adjacent surfaces are held by one holder 81, three holders 81 may be arranged. Further, an octagonal retort may be used. In this case, it is preferable to arrange eight holders 81 for each plane portion of the outer peripheral surface of the retort. In addition, when two adjacent surfaces are held by one holder 81, four holders 81 may be arranged.

1: rotary kiln, 2: retort, 3: screw feeder, 4: upstream hood, 5: hopper, 6: heating unit, 7: downstream hood, 8F: tire, 8R: tire, 9: mount.
24: Sprocket, 30: Supply pipe, 31: Shaft, 32: Screw, 40: Retort insertion hole, 41: Supply pipe insertion hole, 70: Retort insertion hole, 71: Rotary valve, 72: Rotary valve, 80: Outer ring, 81: holder, 82: connecting member, 83: gap, 84: link arm, 85: pin member for outer end, 86: pin member for inner end, 90L: roller, 90R: roller, 91L: roller, 91R: roller , 92: bearing portion.
311: Sprocket, 800: Outer end attachment hole, 810: Inner end attachment portion, 810a: Inner end attachment hole, 811: Connection portion, 811a: Connection hole, 820: Bolt, 821: Nut, 822-824: Washer ring, 840: Outer end, 840a: Outer end hole, 841: Inner end, 841a: Inner end hole.
A1: central axis, A2: central axis.

Claims (7)

A rotary kiln comprising a cylindrical retort that is arranged substantially horizontally and is rotatable about an axis, and a ring member that is arranged on the outer peripheral surface of the retort,
The ring member has an outer ring, an inner peripheral surface that abuts on the outer peripheral surface of the retort, and three or more holders arranged side by side in the circumferential direction, and the adjacent holders are elastically connected to each other. A rotary kiln comprising: a connecting member that annularly surrounds the outer peripheral surface of the retort together with the holder; and a gap defined between the outer ring and the holder.   The rotary kiln according to claim 1, wherein the ring member is a tire that is slidably mounted on a roller.   The rotary kiln according to claim 1, wherein the retort is cylindrical. The holder has flexibility,
The rotary kiln according to claim 3, wherein a curvature of the inner peripheral surface of the holder in a natural state is different from a design curvature of the outer peripheral surface of the retort.   The rotary kiln according to claim 3 or 4, wherein three holders are arranged.   The ring member further includes a link arm that is disposed in the gap and has an outer end that is swingably supported by the outer ring and an inner end that is swingably supported by the holder. The rotary kiln according to any one of claims 1 to 5.   The rotary kiln according to any one of claims 1 to 6, wherein the retort is made of ceramic.

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