JP2017072322A - Rotary kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the stress applied to the junction between a bearing plate and a strike plate.SOLUTION: A rotary kiln comprises a structure in which a discoid bearing plate 10 having three inner cylinders attached thereto and a burner cylinder 8 disposed on the outside of the bearing plate are connected with a connection mechanism 13 interposed therebetween. The connection mechanism 13 includes: a strike plate 14 having a groove 18 attached on the periphery of the bearing plate 10 on the side of the bearing plate 10; a reinforcement plate 15 attached in a flange shape at a position covering the strike plate 14 on the outer periphery of the bearing plate 10; and an opening 20 provided at a position where the reinforcement plate 15 overlaps with the groove 18. On the side of the burner cylinder 8, the connection mechanism includes: a pin holding cylinder 16 provided on the peripheral wall of the burner cylinder 8; and a connection pin 17 held by the pin holding cylinder. The end side of the connection pin 17 located on the inner side of the burner cylinder 8 is inserted into the opening 20 of the reinforcement plate 15 and is fitted in the groove 18 of the strike plate 14. The load of the gravity of the inner cylinder and the bearing plate 10 is transmitted to the connection pin 17 on the side of the burner cylinder 8 via the reinforcement plate 15 as well as the strike plate 14, for making the load be supported.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rotary kiln used for performing pyrolysis gasification treatment or carbonization treatment of an object to be treated.

  As one of the devices for performing pyrolysis gasification treatment and carbonization treatment of municipal solid waste such as municipal waste and industrial waste as an object to be treated, an external heat type (indirect heating type) rotary kiln is used. Are known.

  As one type of the external heat type rotary kiln, a type in which a plurality of inner cylinders are accommodated inside the outer cylinder is known (for example, see Patent Document 1).

  In such a rotary kiln having a plurality of inner cylinders, the support structure for supporting each inner cylinder inside the outer cylinder includes transmitting the rotational force of the outer cylinder to each inner cylinder, and the outer cylinder and the inner cylinder. It is required to be able to absorb the difference in deformation due to the thermal expansion of the cylinder.

  Therefore, each inner cylinder is attached to a disk-like support plate (partition plate) having a diameter smaller than the inner diameter of the outer cylinder, and this support plate is attached to the outer cylinder via a coupling mechanism.

  The coupling mechanism includes a plurality of receiving seats arranged at intervals in the circumferential direction on the outer peripheral portion of the support plate, a pin fitting groove formed in each receiving seat, and each receiving seat in the outer cylinder. A plurality of pin holding cylinders provided along the radial direction of the outer cylinder at positions on the outer circumferential side of the outer cylinder, a connection pin having one end inserted into each pin holding cylinder, and each connection pin extending radially inward of the outer cylinder Biasing means for biasing, and the other end side of each connecting pin is fitted into the corresponding groove of the seat.

  Each seat is disposed so as to fit in a rectangular cutout provided on the outer peripheral portion of the support plate, and is attached to the support plate by welding.

JP 2008-128522 A

  By the way, the connection mechanism moves along a circumferential track when the outer cylinder rotates, and the posture of the connection mechanism rotates once when it goes around the circumferential track. Therefore, when the outer cylinder rotates, the relative positional relationship in the vertical direction changes with respect to the support plate-side seat, the coupling pin, and the outer cylinder-side pin holding cylinder in the coupling mechanism.

  For this reason, the coupling mechanism has a function of transmitting and supporting a downward load due to the weight of the inner cylinder from the support plate to the outer cylinder, and the bearing function is responsible for the load supporting function. The connecting mechanism has an angular posture that comes into contact with the upper side, that is, the connecting mechanism that is mainly located in the lower half of the circumferential track.

  Further, when the posture of the coupling mechanism is rotated, the portion of the seat that comes into contact with the coupling pin from above changes sequentially, such as one side wall of the groove, the inner bottom wall of the groove, and the other side wall of the groove.

  Therefore, considering the seat as a reference, when the load due to the weight of the inner cylinder is transmitted from the seat to the connecting pin, the position where the seat receives the reaction force from the connecting pin and the direction of the reaction force depend on the rotation of the outer cylinder. It changes periodically with it.

  For this reason, stress in which the direction of action sequentially changes acts repeatedly on the joint (welding point) between the support plate and the seat. Therefore, in order to prolong the life of the rotary kiln, it is effective to reduce the stress that repeatedly acts on the joint and suppress the occurrence of damage such as cracks.

  Therefore, the present invention is intended to provide a rotary kiln capable of reducing the stress acting on the joint between the support plate and the seat and extending the life.

  In order to solve the above-mentioned problem, the present invention horizontally places a furnace body having an outer cylinder and a plurality of inner cylinders arranged inside the outer cylinder so as to be rotationally driven, and is supplied into each inner cylinder. In the rotary kiln for thermally decomposing the workpiece to be processed, each inner cylinder has a disk shape with a diameter smaller than the inner diameter of the outer cylinder, and an inner cylinder insertion hole corresponding to the arrangement of the inner cylinders. An attached support plate, and a connection mechanism for connecting a plurality of circumferential positions of the outer periphery of the support plate to the outer cylinder, the connection mechanism including a seat provided on the outer periphery of the support plate; A groove provided on a surface of the seat facing the outer peripheral side of the support plate, a reinforcing plate attached to the outer periphery of the support plate so as to cover the seat, and an arrangement overlapping the groove on the reinforcing plate. The provided opening and the pin provided on the outer cylinder at a position on the outside of the seat A holding tube and a connecting pin held by the pin holding tube, and the connecting pin is inserted into the opening of the reinforcing plate at the end portion located inside the outer tube and into the groove of the seat A rotary kiln with a fitted configuration is assumed.

  The reinforcing plate is configured such that the thickness of the peripheral edge of the opening is larger than the thickness of the portion that is separated from the opening.

  The reinforcing plate has end portions on both sides in the longitudinal direction along the circumferential direction of the support plate, and both end portions in the longitudinal direction of the reinforcing plate are center portions in the width direction orthogonal to the longitudinal direction. Further, the configuration is more triangular.

  The said reinforcement board is set as the structure attached so that it might extend over the range set to the circumferential direction in the position used as the outer side of the inner cylinder insertion hole in the outer periphery of the said support plate.

  According to the rotary kiln of the present invention, the stress acting on the joint between the support plate and the seat can be reduced, and the life of the rotary kiln itself can be extended.

It is an outline figure showing a 1st embodiment of a rotary kiln. It is a figure which expands and shows the cross section of the furnace main body in the rotary kiln of 1st Embodiment. The expansion mechanism in the rotary kiln of a 1st embodiment is expanded and shown, (a) is a partial cutaway view seen from one side of the axial direction of an outer cylinder, and (b) is an AA direction arrow of (a). FIG. As a second embodiment of the rotary kiln, another example of the reinforcing plate in the coupling mechanism is shown. (A), (b), (c), and (d) are examples of different arrangements of the reinforcing plates provided on the outer periphery of the support plate, respectively. FIG. The reinforcement board in the rotary kiln of 2nd Embodiment is shown, (a) (b) is a figure which shows the example from which the number of openings with which a reinforcement board is provided, respectively differs. As a third embodiment of the rotary kiln, still another example of the reinforcing plate in the coupling mechanism is shown.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a schematic view showing a first embodiment of a rotary kiln. FIG. 2 is an enlarged view showing a cross section perpendicular to the axial direction of the kiln body in the rotary kiln of the present embodiment. FIG. 3 is an enlarged view of the coupling mechanism in the rotary kiln of the present embodiment. FIG. 3 (a) is a partially cutaway view seen from one side in the axial direction of the outer cylinder, and FIG. FIG.

  In FIG. 1, the left is the upstream side and the right is the downstream side.

  The rotary kiln of the present embodiment is indicated by reference numeral 1 in FIG. 1, and from the upstream side, a dust feeder 2 provided with a hopper 3, an inlet cylinder 4, a furnace body 5, an outlet cylinder 6, and a separation chamber 7 In order.

  First, the furnace body 5 will be described.

  The furnace body 5 includes a plurality of inner cylinders 9 arranged at angular intervals set in the circumferential direction around the axis of the outer cylinder 8 inside the outer cylinder 8 on which a refractory material (not shown) is attached. Is stored. In the present embodiment, for example, as shown in FIG. 2, three inner cylinders 9 arranged at intervals of 120 degrees in the circumferential direction are accommodated inside the outer cylinder 8.

  As shown in FIGS. 1 and 2, the inner tube 9 has a double tube structure including an outer tube 9a and an inner tube 9b arranged concentrically with a gap therebetween, and the outer tube 9a and the inner tube 9b. The space between the two is a heating flow path 12. The relative positions of the outer tube 9a and the inner tube 9b are held via a connecting member (not shown). The shape, arrangement, and number of the connecting members are set so as not to hinder the flow of a heating medium such as hot air 46 that flows through the heating flow path 12 as will be described later.

  As shown in FIG. 2, each inner cylinder 9 is formed in a disk shape having a diameter smaller than the inner diameter of the outer cylinder 8 at a plurality of positions in the longitudinal direction (three positions in FIG. 1). A support plate 10 having an inner cylinder insertion hole 11 is attached. As a result, the inner cylinders 9 are inserted and arranged in the inner cylinder insertion holes 11 of the support plate 10, so that their relative positions are maintained.

  At this time, a difference in deformation due to thermal expansion between the inner cylinder 9 and the support plate 10 is between the inner peripheral surface of the inner cylinder insertion hole 11 and the outer peripheral surface of the inner cylinder 9 (the outer peripheral surface of the outer tube 9a). A gap is formed for absorbing water. The inner cylinder 9 is held at a plurality of locations in the circumferential direction at the peripheral edge of the inner cylinder insertion hole 11 via support pins (not shown) extending along the radial direction of the inner cylinder 9.

  Each support plate 10 is connected to the outer cylinder 8 through a connecting mechanism 13 as shown in FIGS.

  The connection mechanism 13 includes a receiving seat 14 and a reinforcing plate 15 provided on the support plate 10 side, a pin holding cylinder 16 provided on the outer tube 8 side, and a connection pin 17.

  The receiving seats 14 are arranged in a plurality of locations at intervals in the circumferential direction on the outer peripheral portion of the support plate 10.

  The receiving seat 14 has, for example, a rectangular parallelepiped shape, and a groove 18 for fitting the connecting pin 17 is provided on a surface that faces the outer peripheral side of the support plate 10. The support plate 10 is provided with notch-shaped recesses 19 at a plurality of locations corresponding to the arrangement of the receiving seats 14 on the outer periphery, and the receiving seats 14 are arranged so as to fit into the respective recesses 19. It is attached to the edge of the recess 19 by welding.

  The reinforcing plate 15 is a belt-like plate material that extends in the circumferential direction in contact with the outer periphery (outer edge) of the support plate 10, and is disposed on the outer periphery of the support plate 10 in a flange shape so as to cover the outer peripheral side of the receiving seat 14. . The reinforcement plate 15 is attached to the outer periphery of the support plate 10 using a welding technique such as fillet welding. The reinforcing plate 15 is also attached to the seat 14 by a welding technique such as fillet welding.

  The reinforcing plate 15 is provided with an opening 20 penetrating in the plate thickness direction so as to overlap the groove 18 of the receiving seat 14. Thus, when the connecting pin 17 is fitted into the groove 18 of the receiving seat 14, the connecting pin 17 is inserted into the opening 20 of the reinforcing plate 15.

  It is preferable that the reinforcing plate 15 further includes a configuration in which the thickness of the peripheral edge of the opening 20 is larger than the thickness of the portion that is separated from the opening 20 and the peripheral edge of the opening 20 is further reinforced. . In this configuration, for example, the reinforcing plate 15 may be configured to include a doubling plate (stacked plate) 15a on the periphery of the opening 20 as shown in FIGS. This is because the connecting pin 17 is inserted and disposed in the opening 20, and it is desired that the periphery of the opening 20 that receives a load (force) from the connecting pin 17 should have high strength. In order to suppress the performance required for the rotation support mechanism 36 and the rotation drive mechanism 38 (see FIG. 1), the unnecessary thickness of the reinforcing plate 15 is suppressed to reduce the weight as much as possible, thereby reducing the weight of the furnace body 5. This is because is effective.

  Since the reinforcing plate 15 including the doubling plate 15 a is disposed inside the furnace body 5, it can be considered that the reinforcing plate 15 comes into contact with a heating medium such as hot air 46 (see FIG. 1) circulated through the heating flow path 12. Therefore, the material of the reinforcing plate 15 including the doubling plate 15a may be made of, for example, stainless steel (SUS) in consideration of heat resistance and corrosion resistance. As long as the reinforcing plate 15 has heat resistance and corrosion resistance against a heating medium such as the hot air 46, the reinforcing plate 15 may be made of the same material as that of the support plate 10 and the receiving seat 14, and is made of a material other than SUS. Of course, it is also good.

  What is necessary is just to set suitably the thickness (plate thickness) of the reinforcement board 15 and the doubling plate 15a according to the intensity | strength desired for the reinforcement board 15 and the doubling plate 15a. Further, the thickness ratio between the reinforcing plate 15 and the doubling plate 15a shown in FIG. 3A is for convenience of illustration and does not reflect the actual dimensional ratio. Accordingly, the thickness ratio between the reinforcing plate 15 and the doubling plate 15a may be changed as appropriate.

  As shown in FIG. 3 (b), both ends of the reinforcing plate 15 in the longitudinal direction have a width-direction central portion arranged along the support plate 10 with respect to the width direction orthogonal to the longitudinal direction. It has a protruding triangular shape. The reason why the reinforcing plate 15 has such a shape is that it is advantageous for releasing the stress acting on the reinforcing plate 15 itself and for increasing the leg length of welding to the support plate 10.

  In addition, although the triangular shape shown in FIG.3 (b) is preferable as the shape of the longitudinal direction both ends side of the reinforcement board 15, of course, it is good also as other arbitrary shapes.

  The outer cylinder 8 is provided with pin attachment holes 21 penetrating in the inner and outer directions at a plurality of locations on the peripheral wall that are outside the seats 14.

  The pin holding cylinder 16 is inserted through the pin mounting hole 21 in a posture along the radial direction of the outer cylinder 8. A ring-shaped seat plate 22 that is curved along the outer peripheral surface of the outer cylinder 8 is airtightly attached to the outer periphery of the pin holding cylinder 16 at a position along the outer peripheral surface of the outer cylinder 8. The outer peripheral edge of the seat plate 22 is airtightly attached to the peripheral edge of the pin attachment hole 21.

  The pin holding cylinder 16 is provided with a flange 23 at an end protruding outward of the outer cylinder 8. Furthermore, reinforcing ribs 24 are provided in an arrangement set in the circumferential direction on the outer periphery of the pin holding cylinder 16 and between the seat plate 22 and the flange 23.

  A connecting pin 17 is slidably inserted into the pin holding cylinder 16. The connecting pin 17 is inserted into the opening 20 of the reinforcing plate 15 at the end protruding from the inner side of the outer cylinder 8 and is fitted into the groove 18 of the receiving seat 14.

  A plate member 25 is attached to the flange 23 with a screw (counter screw) 26 so as to close the opening. A bolt hole 27 in which a female screw is cut is provided at the center of the plate member 25, and an adjustment bolt 28 is screwed from the outside of the outer cylinder 8.

  A spring receiver 29 is provided on the tip side of the adjustment bolt 28. A spring 30 as an urging means is sandwiched between the spring receiver 29 and the connecting pin 17. As a result, when the adjustment bolt 28 is tightened into the bolt hole 27 of the plate member 25 and the spring 30 is compressed, the connecting pin 17 is urged by the restoring force in the extending direction of the compressed spring 30 to the seat 14. Pressed.

  Therefore, the support disposed in the outer cylinder 8 is adjusted by appropriately adjusting the urging force applied to each connecting pin 17 as described above by the pin holding cylinders 16 provided in the circumferential direction of the outer cylinder 8. The plate 10 and the inner cylinder 9 (see FIGS. 1 and 2) are held by the connecting pins 17 that are pressed toward the seats 14. In this state, when the inner cylinder 9 and the support plate 10 rotate together with the outer cylinder 8, the connecting pin 17 disposed in the lower half portion of the outer cylinder 8 faces downward due to the weight of the inner cylinder 9 and the support plate 10. On the other hand, the downward load hardly acts on the connecting pin 17 disposed in the upper half portion of the outer cylinder 8, but the change in the load acting on each connecting pin 17 is as follows. It is absorbed by the radial movement of the outer cylinder 8 of the connecting pin 17 accompanying the expansion and contraction of the spring 30.

  Furthermore, even when a difference in deformation due to thermal expansion occurs between the outer cylinder 8 and the support plate 10, the spring 30 is bent and the connecting pin 17 moves in the radial direction of the outer cylinder 8, so that the thermal expansion difference Is absorbed.

  Therefore, in the connection mechanism 13, the fitting of each connection pin 17 to the seat 14 is always maintained.

  For this reason, when the outer cylinder 8 rotates, a load acting in the rotation direction is supported from the outer cylinder 8 through the pin holding cylinders 16, the connection pins 17, the seats 14, and the reinforcing plates 15. 10 is transmitted. For this reason, when the outer cylinder 8 is rotated, the support plate 10 and the inner cylinder 9 are rotated together with the outer cylinder 8.

  A cover 31 is attached to the plate member 25 to prevent gas leakage from the screwed portion of the adjustment bolt 28 with respect to the bolt hole 27.

  As shown in FIG. 1, on the inner side near the upstream of the outer cylinder 8, an inlet-side header 32 where the upstream opening of the inner pipe 9 b of each inner cylinder 9 joins is provided. A supply side communication pipe 33 is provided on the upstream side of the header 32 in a coaxial arrangement with the outer cylinder 8.

  In addition, the to-be-processed object 41 is guide | induced to each inner cylinder 9 from the header part 32 so that it may mention later. Therefore, although not shown, the header part 32 is provided with a means for scraping the workpiece 41 in the header part 32 and sending it to each inner cylinder 9 by rotating integrally with the header part 32. preferable.

  Inside the outer cylinder 8 on the downstream side, a discharge side communication pipe 35 is provided coaxially with the outer cylinder 8. The downstream side of each inner cylinder 9 is connected so that each inner pipe 9 b is partially communicated with the communication pipe 35. Portions other than the communication portions on the downstream side of each inner pipe 9 b and the upstream side of the communication pipe 35 are airtightly closed by the closing plate 34.

  The furnace body 5 having the above-described configuration is in a horizontal orientation in which the axial direction of the outer cylinder 8 is inclined downward from the upstream side toward the downstream side. In this state, a plurality of locations in the axial direction of the outer cylinder 8 are provided. The rotary support mechanism 36 is rotatably supported via a rotating body 37 such as a roller.

  Further, a rotation drive mechanism 38 having a drive source such as a motor is attached to the outer cylinder 8. Thereby, the furnace body 5 is rotationally driven by the operation of the rotational drive mechanism 38.

  The upstream side of the outer cylinder 8 is rotatably connected to the inlet cylinder 4 that is fixedly arranged via a rotary joint 39. The downstream side of the outer cylinder 8 is rotatably connected to the outlet cylinder 6 that is fixedly arranged via a rotary joint 40.

  A supply-side communication pipe 33 is inserted into the inlet cylinder 4 and disposed. A dust feeder 2 having a hopper 3 is provided on the upstream side of the inlet cylinder 4, and an outlet side of the dust feeder 2 is inserted into the communication pipe 33. Accordingly, when the dust feeder 2 is operated, the workpiece 41 in the hopper 3 is supplied to the inlet side header 32 through the dust feeder 2. The workpiece 41 supplied to the header portion 32 is supplied from the header portion 32 into the inner cylinder 9 that rotates as the furnace body 5 rotates.

  The outlet tube 6 is disposed so that the discharge side communication pipe 35 is inserted therethrough. On the downstream side of the outlet tube 6, a separation chamber 7 is provided so as to communicate with the communication pipe 35.

  The separation chamber 7 includes an internal space for separating the pyrolysis gas 42 and the pyrolysis residue 43, a top gas outlet 44, and a bottom pyrolysis residue 43 outlet 45.

  Furthermore, an inlet 47 of hot air 46 as a heating medium is provided in the outlet cylinder 6 so as to communicate with the heating flow path 12. The inlet tube 4 is provided with an outlet 48 for hot air 46 in communication with the heating flow path 12.

  A seal plate 49 that seals the upstream end of the inlet tube 4 on the outer peripheral side of the communication tube 33 is provided at the end of the communication tube 33 that is separated from the inner tube 9. A seal plate 50 that seals the downstream end of the outlet tube 6 on the outer peripheral side of the communication tube 35 is provided at the end of the communication tube 35 that is separated from the inner tube 9.

  When the rotary kiln 1 according to the present embodiment having the above-described configuration is used to treat an object to be treated 41 such as municipal waste or industrial waste, the rotary main mechanism 5 of the rotary drive mechanism 38 is used. Start rotating. Next, the dust feeder 2 is operated to supply the workpiece 41 in the hopper 3 to the header 32. The workpiece 41 supplied to the header portion 32 is supplied from the header portion 32 into the inner cylinder 9 that rotates as the furnace body 5 rotates.

  The inlet 47 is supplied with hot air 46 guided from a heating medium supply unit (not shown) such as a hot stove. As a result, the hot air 46 flows into the heating channel 12 from the inlet 47 and then flows through the heating channel 12 toward the outlet 48. For this reason, each inner cylinder 9 is heated by the hot air 46 which distribute | circulates the heating flow path 12. FIG.

  At this time, since the air supply to the inside of the inner cylinder 9 is not performed, the workpiece 41 in the inner cylinder 9 is heated by the hot air 46 flowing through the heating flow path 12 in an atmosphere in which the oxygen concentration is limited. It is indirectly heated through the peripheral wall of the tube 9b. When the workpiece 41 is heated until it reaches the thermal decomposition temperature, the workpiece 41 is pyrolyzed into a pyrolysis gas 42 and a pyrolysis residue 43 mainly composed of carbon. The pyrolysis gas 42 and the pyrolysis residue 43 generated by the pyrolysis of the workpiece 41 in each inner cylinder 9 are sent to the separation chamber 7 through the communication pipe 35 from the downstream side of each inner cylinder 9.

  In the separation chamber 7, the pyrolysis gas 42 and the pyrolysis residue 43 guided through the communication pipe 35 are separated in the vertical direction, so that the pyrolysis gas 42 is taken out and collected from the gas outlet 44, and is heated from the outlet 45. The decomposition residue 43 is taken out and collected.

  Thus, according to the rotary kiln 1 of this embodiment, the to-be-processed object 41 is pyrolyzed in each inner cylinder 9 of the rotating furnace main body 5, and the pyrolysis gas 42 and the pyrolysis residue 43 are isolate | separated. Can be recovered.

  Further, in the rotary kiln 1 of the present embodiment, the connecting pin 17 is inserted into the groove 18 of the receiving seat 14 by the connecting mechanism 13 and is inserted through the opening 20 of the reinforcing plate 15 attached to the support plate 10. It becomes the composition. A downward load due to the weight of the inner cylinder 9 and the support plate 10 acts on the connecting pin 17 disposed in the lower half of the outer cylinder 8. In this case, in this embodiment, the seat 14 is moved from the support plate 10. In addition to the transmission of the load to the connecting pin 17 via the load, the transmission of the load from the support plate 10 to the connecting pin 17 via the reinforcing plate 15 is also performed.

  Accordingly, the reaction force received from the connecting pin 17 side during the transmission of the load is distributed to the seat 14 and the reinforcing plate 15. For this reason, in this embodiment, the stress which acts on the junction part (welding part) of the support plate 10 and the receiving seat 14 can be reduced, and generation | occurrence | production of damages, such as a crack, in this junction part is suppressed. Can do.

  For this reason, the lifetime of the rotary kiln 1 of this embodiment can be increased.

  The reinforcing plate 15 is attached to the outer periphery of the support plate 10 to which the receiving seat 14 is attached in such a manner that the opening 20 is aligned with the groove 18 of the receiving seat 14. Therefore, the configuration of the present embodiment is applied to the existing rotary kiln by modifying the existing rotary kiln 1 by temporarily removing the connecting pin 17 and welding and attaching the reinforcing plate 15 to the support plate 10 in that state. Is possible. Therefore, this embodiment is also effective when extending the life (prolonging the life) of the existing rotary kiln.

  In addition, in this embodiment, it is preferable that all the connection mechanisms 13 arrange | positioned in the circumferential direction of the support plate 10 are the structures provided with the reinforcement board 15 as shown to Fig.3 (a) (b). However, in consideration of the fact that the support plate 10 is provided with the inner cylinder insertion holes 11 at a plurality of locations in the circumferential direction, and therefore the strength of the support plate 10 is not uniform in the circumferential direction, FIG. The coupling mechanism 13 having the configuration shown in (b) and the coupling mechanism having a configuration excluding the reinforcing plate 15 from the configuration shown in FIGS. 3 (a) and 3 (b) may be mixed and used. Good.

[Second Embodiment]
FIG. 4 shows another example of the coupling mechanism as the second embodiment of the rotary kiln. FIGS. 4A, 4B, 4C, and 4D are different reinforcing plates provided on the outer periphery of the support plate. It is a figure which shows the example of arrangement | positioning. FIG. 5 is an enlarged view of the reinforcing plate in the rotary kiln of the present embodiment, and FIGS. 5A and 5B are diagrams showing configuration examples of the reinforcing plate having different numbers of openings.

  As shown in FIGS. 4A, 4B, 4C, and 4D, the rotary kiln of the present embodiment has the same configuration as that of the first embodiment, and the reinforcing plate 15 is disposed along the outer periphery of the support plate 10. It is set as the structure attached so that it might extend over the range set to the circumferential direction.

  4 (a), (b), (c), (d), and FIGS. 5 (a) and 5 (b), the same components as those shown in FIGS. 1 to 3 (a) and (b) are denoted by the same reference numerals. The description is omitted.

  Here, the setting method of the circumferential direction range which provides the reinforcement board 15 is demonstrated.

  As shown in FIG. 4A, the support plate 10 has a disc shape and is configured with a plurality of inner cylinder insertion holes 11. For this reason, the area located near the outer periphery of the support plate 10 and outside the inner cylinder insertion holes 11 in the radial direction has a dimension w along the radial direction (hereinafter referred to as a radial width dimension w). Since it is limited between the outer periphery of 10 and the inner cylinder insertion hole 11, it is smaller than the radius r.

  Therefore, the region located on the outer side in the radial direction from the inner cylinder insertion hole 11 is an area where the material of the support plate 10 is continuously present in the radial direction between the inner cylinder insertion holes 11. It is lower than the strength.

  Thus, for example, in the configuration of FIG. 4A, a portion of the support plate 10 that is radially outside the inner cylinder insertion holes 11 and in which the radial width dimension w is 50% or less of the radius r. About (w <= 0.5r), the reinforcement board 15 is attached to the outer periphery of the range covering the full length of the circumferential direction of this part. In FIG. 4A, for convenience of illustration, the description of the receiving seat 14 in the support plate 10 and the doubling plate 15a of the reinforcing plate 15 is omitted (FIGS. 4B, 4C, and 4D described later). The same applies to FIG.

  As a result, the support plate 10 is reinforced by the reinforcing plate 15 in a region outside the inner cylinder insertion holes 11 in the radial direction and the radial width dimension w is 50% or less of the radius r.

  The portion where the radial width dimension w is smaller than the radius r as described above is a portion used for holding the inner cylinder 9 inserted through the inner cylinder insertion hole 11. Therefore, the strength of this portion is related to the stability of holding the inner cylinder 9. In the present embodiment, since the portion is reinforced by the reinforcing plate 15 extending along the circumferential direction, the inner cylinder 9 can be more stably held by the support plate 10.

  In addition, in this embodiment, the transmission of force between the reinforcing plate 15 and the support plate 10 can be performed in a wider range in the circumferential direction than in the case of the first embodiment.

  Therefore, in addition to the same effects as those of the first embodiment, the present embodiment can be further advantageous for extending the life of the rotary kiln 1 itself.

  By the way, depending on the material of the support plate 10, the plate thickness, the diameter and the arrangement of the inner cylinder insertion holes 11, the reinforcement plate can be used even in a region outside the inner cylinder insertion holes 11 in the support plate 10 in the radial direction. The radial width w of the portion where reinforcement by attachment of 15 is desired varies.

  Therefore, when setting the circumferential range to which the reinforcing plate 15 is attached as “a portion where the radial width dimension w is not more than x% of the radius r (w ≦ r · x / 100)”, the value of x is appropriately changed. Of course it is good.

  For example, the configuration of FIG. 4B is a region (w ≦ 0.4r) where the radial width dimension w is 40% or less of the radius r in the outer peripheral region of each inner cylinder insertion hole 11 of the support plate 10. ), A reinforcing plate 15 is attached to the outer periphery in a range extending over the entire length in the circumferential direction of the portion.

  The configuration of FIG. 4C is a region (w ≦ 0.3r) where the radial width dimension w is 30% or less of the radius r in the outer peripheral region of each inner cylinder insertion hole 11 of the support plate 10. The reinforcing plate 15 is attached to the outer periphery of the range over the entire length in the circumferential direction of the portion.

The configuration of FIG. 4D is a region (w ≦ 0.2r) where the radial width dimension w is 20% or less of the radius r in the outer peripheral region of each inner cylinder insertion hole 11 of the support plate 10. The reinforcing plate 15 is attached to the outer periphery of the range over the entire length in the circumferential direction of the portion.

  4 (b), (c), and (d), similarly to the configuration of FIG. 4 (a), in the region on the outer peripheral side of each inner cylinder insertion hole 11 in the support plate 10, and in the radial direction. A portion where the width dimension w is equal to or less than the set dimension is reinforced along the circumferential direction by the reinforcing plate 15.

  Therefore, the same effect as in the case of the configuration shown in FIG.

  4A, 4B, 4C, and 4D show configuration examples, and the value of x described above may be any value other than 50, 40, 30, and 20. Of course, a value larger than 50 or a value smaller than 20 may be used.

  4A, 4B, 4C, and 4D, when the reinforcing plate 15 extending in the circumferential direction is attached to the outer periphery of the support plate 10, the attachment range of the reinforcing plate 15 is set to the outer peripheral portion of the support plate 10. In some cases, the connection mechanism 13 extends in the circumferential direction. In that case, the configuration of the reinforcing plate 15 may be configured to connect a plurality of connecting mechanisms 13 as shown in FIG. 5A or 5B.

  The reinforcing plate 15 shown in FIG. 5 (a) has an opening 20 and a peripheral edge thereof at two locations according to the arrangement of the seats 14 of the two coupling mechanisms 13 provided adjacent to the outer peripheral portion of the support plate 10. A doubling plate 15a is provided. In this case, the two connecting mechanisms 13 have the same configuration as the connecting mechanism 13 shown in FIGS. 3A and 3B except for the reinforcing plate 15. Thereby, in the configuration of FIG. 5A, the two connecting mechanisms 13 are connected by the common reinforcing plate 15.

  The reinforcing plate 15 shown in FIG. 5 (b) has openings 20 at a plurality of locations corresponding to the arrangement of the receiving seats 14 of the three or more coupling mechanisms 13 arranged in the outer periphery of the support plate 10. The peripheral doubling plate 15a is provided. In this case, the plurality of connecting mechanisms 13 have the same configuration as the connecting mechanism 13 shown in FIGS. 3A and 3B except for the reinforcing plate 15. Thereby, in the configuration of FIG. 5B, a configuration in which three or more of the plurality of connecting mechanisms 13 are connected by the common reinforcing plate 15 is obtained.

  In this embodiment, since the attachment range of the reinforcing plate 15 is set as shown in FIGS. 4A, 4B, 4C, and 4D, the reinforcing plate 15 is arranged in the circumferential direction on the outer peripheral portion. It is conceivable that some of the plurality of connecting mechanisms 13 provided outside the mounting range of the reinforcing plate 15 are out of the mounting range. In this case, a connecting mechanism having a configuration in which the reinforcing plate 15 is removed from the configuration of the connecting mechanism 13 shown in FIGS. 3A and 3B is provided at a location outside the attachment range of the reinforcing plate 15. Thus, the outer cylinder 8 (see FIGS. 3A and 3B) and the support plate 10 may be connected.

[Third Embodiment]
FIG. 6 shows still another example of a coupling mechanism as a third embodiment of the rotary kiln.

  In FIG. 6, the same components as those shown in FIGS. 1 to 3A and 3B are denoted by the same reference numerals, and the description thereof is omitted.

  In each of the above-described embodiments, the plurality of reinforcing plates 15 are attached to the outer periphery of the support plate 10 in the circumferential direction. However, as shown in FIG. It is good also as a structure which attached the reinforcement board 15 extended over the periphery.

  According to the present embodiment having such a configuration, the stress acting on the joint portion (welding point) between the support plate 10 and the seat 14 (see FIGS. 3A and 3B) can be reduced, and the rotary kiln 1 itself can be reduced. It is possible to extend the service life.

  In addition, this invention is not limited only to said each embodiment, The longitudinal direction dimension of the reinforcement board 15 shown to Fig.3 (a) (b) and the width dimension orthogonal to it are the convenience for illustration. It does not reflect actual dimensions. Therefore, the longitudinal dimension and the width dimension of the reinforcing plate 15 may be appropriately set according to the range and strength of the support plate 10 for which reinforcement by the reinforcing plate 15 is desired.

  The reinforcing plate 15 shown in FIGS. 5A and 5B has a length dimension from an opening 20 near one end in the longitudinal direction of the reinforcing plate 15 to one end in the longitudinal direction, and an opening 20 near the other end in the longitudinal direction. Although the length dimension from the other end in the longitudinal direction to the other end in the longitudinal direction is shown as having the same configuration, a range in which the reinforcement plate 15 on the outer periphery of the support plate 10 is desired to be reinforced, and a connection mechanism in the circumferential direction of the support plate 10 13, the length of the reinforcing plate 15 from the opening 20 near one end in the longitudinal direction to one end in the longitudinal direction, and the length from the opening 20 near the other end in the longitudinal direction to the other end in the longitudinal direction. May be different.

  4A, 4B, 4C, and 4D, a range in which reinforcement by the reinforcement plate 15 on the outer periphery of the support plate 10 is desired, and the range. Depending on the position and the number of the coupling mechanisms 13 arranged in the above, the arrangement and the number of the openings 20 may be different for each reinforcing plate 15.

  The inner cylinder 9 has been described as having a double tube structure including the outer tube 9a and the inner tube 9b, but the inner tube 9 may have a single tube structure. In this case, a space formed between the inner cylinder 9 and the outer cylinder 8 may be used as the heating channel 12.

  Of course, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Rotary kiln, 5 Furnace main body, 8 Outer cylinder, 9 Inner cylinder, 10 Support plate, 11 Inner cylinder insertion hole, 13 Connection mechanism, 14 Seat, 15 Reinforcement plate, 15a Doubling plate, 16 pin holding cylinder, 17 Connection pin, 18 grooves, 20 openings, 41 workpiece

Claims (4)

In a rotary kiln for horizontally disposing a furnace main body having an outer cylinder and a plurality of inner cylinders arranged inside the outer cylinder so as to be rotationally driven, and for thermally decomposing an object to be processed fed into each of the inner cylinders,
A disk-like shape having a diameter smaller than the inner diameter of the outer cylinder, and an inner cylinder insertion hole according to the arrangement of the inner cylinders, and a support plate attached to the inner cylinders;
A connection mechanism for connecting a plurality of circumferential positions of the outer peripheral portion of the support plate to the outer cylinder,
The coupling mechanism is
A seat provided on the outer periphery of the support plate;
A groove provided on a surface facing the outer peripheral side of the support plate in the seat;
A reinforcing plate attached to the outer periphery of the support plate so as to cover the seat;
An opening provided in the reinforcing plate so as to overlap the groove;
A pin holding cylinder provided on the outer cylinder at a position on the outside of the seat;
A connection pin held by the pin holding cylinder,
The rotary kiln is characterized in that the end of the connecting pin located inside the outer cylinder is inserted into the opening of the reinforcing plate and fitted in the groove of the seat. The rotary kiln according to claim 1, wherein the reinforcing plate has a configuration in which a thickness of a peripheral edge of the opening is larger than a thickness of a portion separated from the opening. The reinforcing plate has end portions on both sides in the longitudinal direction along the circumferential direction of the support plate, and both end portions in the longitudinal direction of the reinforcing plate are center portions in the width direction orthogonal to the longitudinal direction. The rotary kiln according to claim 1 or 2, wherein the rotary kiln has a triangular shape protruding further. The said reinforcement board is attached so that it may extend over the range set to the circumferential direction in the position which becomes the outer side of the inner cylinder insertion hole in the outer periphery of the said support board. Rotary kiln.

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