JPH09217989A - Sealing mechanism for external heat type rotary kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealing mechanism for an external heat type rotary kiln in which an effective seal can be realized without feeding air or the like under pressure. SOLUTION: An external heat type rotary kiln comprises an inner cylinder 12 driven to rotate, for feeding and moving a material to be treated which is charged from an inlet to an outlet side and discharging the material from the outlet and a heating furnace arranged on the outer periphery of the inner cylinder 12 for heating the cylinder 12. A sealing mechanism 30A is provided between the rotating side annular member 11 of the external heat type rotary kiln and a fixed side annular member 16 opposed thereto. The first annular member 11 of the two annular members 11 and 16 is provided with a sliding contact surface S substantially traversing the rotating axis of the rotating side annular member 11. A movable flange 62 connected to the second annular member 16 in an airtight state through an expansion pipe 63 is pressed to the sliding contact surface S under the force of an urging member 66 and is prevented from rotating by using a rotation stop mechanism 70 for permitting only an axial movement relative to the second annular member 16.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a waste plastic,
The present invention relates to a seal mechanism for an externally heated rotary kiln used for dry distillation and gasification of shredder dust, waste home appliances, OA equipment, general waste, and the like.

[0002]

2. Description of the Related Art In an external heat type rotary kiln, an inner cylinder for feeding and moving an object to be processed is inserted into a heating furnace, and the inner cylinder is rotated so that the object to be processed introduced from an inlet is transferred to the inner cylinder. It is sent to the exit side by utilizing the slope and discharged from the exit. In this case, since there is a gap between the rotating portion and the fixed portion, a sealing mechanism is arranged at a portion where flame may blow out or gas may leak from the gap.

In a conventional external heat type rotary kiln, as shown in Japanese Patent Laid-Open No. 53-56167, an annular seal box containing a seal plate is provided in a portion where inner cylinders at both ends of a heating furnace penetrate. By blowing air or an inert gas having a higher pressure than the heating furnace into the box, it is possible to prevent the flame from blowing out from the heating furnace.

[0004]

However, in the conventional seal mechanism of the external heat type rotary kiln, it is necessary to pump air or an inert gas for sealing, so that the running cost is high, and the pumping means is required at the time of power failure. If was stopped, it would be impossible to seal the seal, which could impair safety.

In view of the above circumstances, it is an object of the present invention to provide a seal mechanism for an external heat type rotary kiln capable of reliable sealing without pressure-feeding air or the like.

[0006]

According to a first aspect of the present invention, an inner cylinder, which is rotationally driven to feed and move an object to be processed, which has been introduced from an inlet, toward an outlet, and discharges it from the outlet, and an outer periphery of the inner cylinder. In the external heat type rotary kiln provided with a heating furnace for heating the inner cylinder, a seal mechanism provided between the rotary side annular member and the fixed side annular member facing the rotary side annular member,
Of the two annular members, the first annular member is provided with a sliding contact surface that is substantially orthogonal to the rotation axis of the rotation-side annular member,
An annular moving flange, which is airtightly connected to the second annular member via an expansion tube, is brought into pressure contact with the sliding contact surface by the force of the biasing member, and the moving flange is axially moved with respect to the second annular member. The feature is that the rotation is stopped by using the rotation stop mechanism that allows only the movement of the.

According to a second aspect of the present invention, in the first aspect, the first annular member is the rotating inner cylinder, and the sliding surface is an annular partition plate protruding from the outer periphery of the inner cylinder. Fixed side annular members as the second annular members are provided on both sides of the partition plate, and the fixed side annular members as the second annular members are provided between the partition plates. In order to seal the above, a moving flange that is brought into pressure contact with the sliding surface by the biasing member and a rotation stopping mechanism for the moving flange are provided between each stationary-side annular member and the partition plate. Is characterized by.

According to a third aspect of the present invention, the heating furnace is located at an intermediate portion in the axial direction, is concentrically arranged on the outer circumference of the inner cylinder, and is driven to rotate by a drive mechanism. And a casing for supplying / discharging heated fluid, which is connected to the outer cylinder by an inner / outer cylinder connecting mechanism so that the inner cylinder rotates together with the outer cylinder, and the inner space of the casing and the inner cylinder. The gap between the outer cylinders is the flow path for the heating fluid,
The sealing means between the connecting portion of the outer cylinder as the rotating side annular member and the casing as the stationary side annular member.
It is characterized in that the described seal mechanism is provided.

According to a fourth aspect of the present invention, the heating furnace is located at an intermediate portion in the axial direction, is concentrically arranged on the outer periphery of the inner cylinder, and is driven to rotate by a drive mechanism, and is fixed to both ends thereof. And a casing for supplying / discharging heating fluid disposed in the inner cylinder, the inner cylinder is connected to the outer cylinder by an inner / outer cylinder connecting mechanism so that the inner cylinder rotates together with the outer cylinder, and both ends of the inner cylinder respectively inside the casing. A hood is fixedly provided on the outside of each casing so as to block the inlet and outlet of the inner cylinder penetrating through the casing from the atmosphere, and the inner space of the casing and the gap between the inner cylinder and the outer cylinder are heated. Is a fluid flow path,
The sealing mechanism according to claim 2 is provided as means for sealing between the inner cylinder as the rotating side annular member and the casing and the hood as the two stationary side annular members.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an outline of the entire configuration of an external heat type rotary kiln 1 incorporating a sealing mechanism of an embodiment of the present invention. The rotary kiln 1 installed on the gantry 2 dry-distills and gasifies the material to be treated H introduced from the charging hopper 3 and the charging device 4 to the inlet 12a to obtain the treated solid P. Discharge from the outlet 12b to the discharge hopper 6,
The gas G generated by the treatment is taken out from the generated gas hood 19 to the outside. Charging hopper 3
Is composed of two sets of hoppers with built-in sealable dampers, and purges the inside of the hopper with combustion exhaust gas having a low nitrogen or oxygen content to prevent the atmosphere from entering the kiln 1. The discharge hopper 6 is also the same. The purging is carried out in order to prevent an explosion due to the mixture of combustible gas generated in the kiln 1 and oxygen in the atmosphere.

The rotary kiln 1 includes an outer cylinder 11 and
The heating fluid inlet casing 16 and the heating fluid outlet casing 17 arranged on both sides of the outer cylinder 11 in the axial direction, the inner cylinder 12 penetrating the inside thereof, and the outlet 12b side of the inner cylinder 12 are covered so as to be shielded from the atmosphere. Outlet side generated gas hood 19
An inlet side gas hood 20 for covering the inlet 12a side of the inner cylinder 12 so as to be shielded from the atmosphere, and a rotation support mechanism 21 and a rotation drive mechanism 24 for the outer cylinder 11. Further, the seal mechanism 30A provided at the connecting portion between the end of the outer cylinder 11 and the inner end of the heated fluid inlet casing 16 and the outer cylinder 1
1, a sealing mechanism 30B provided at a connecting portion between the end of the heating fluid outlet casing 17 and the inner end of the heated fluid outlet casing 17, the outer periphery of the end of the inner cylinder 12, the outer end of the heated fluid inlet casing 16, and the outlet side generated gas hood 19. A seal mechanism 32A provided between the
A seal mechanism 32B provided between the outer circumference of the end of the inner cylinder 12, the outer end of the heated fluid outlet casing 17, and the inlet gas hood 20, an inner-outer cylinder connecting mechanism 18A that connects the inner cylinder 12 and the outer cylinder 11. 18B and.

In this rotary kiln 1, a heating furnace is constituted by an outer cylinder 11, a heating fluid inlet casing 16 and a heating fluid outlet casing 17, and an inner cylinder 12 is provided inside the outer cylinder 11 so as to penetrate the inside thereof. It is installed in. The inner cylinder 12 is slightly inclined with respect to the horizontal, and when it is rotated, the workpiece H introduced from the inlet 12a of the higher end opening is transferred to the outlet 12 of the lower end opening.
It is gradually fed to the side b and discharged, and discharged from the outlet 12b.
The inner cylinder 12 is concentrically arranged inside the outer cylinder 11,
It is connected to the outer cylinder 11 via inner and outer cylinder connecting mechanisms 18A and 18B.

An outer cylinder 11 located at an axially intermediate portion of the heating furnace.
Is a main part of the heating furnace, and the rotary support mechanism 2
It is rotatably supported by 1, and is rotationally driven by a rotary drive mechanism 24. Rotation support mechanism 21
Is composed of a support roller 22 arranged below the outer cylinder 11, and a tire 23 fitted to the outer circumference of the outer cylinder 11 and rotatably supported by the support roller 22. Rotation drive mechanism 2
As shown in FIG. 2, 4 includes a drive source 25 such as a motor, a pinion gear 26 rotated by the drive source 25, and a ring gear 27 meshed with the pinion gear 26 and fitted on the outer circumference of the outer cylinder 11. Then, the inner cylinder 12 is rotated by operating the drive source 25 and rotating the outer cylinder 11.

A flow path 13 for the heating fluid K is secured between the inner cylinder 12 and the outer cylinder 11, and this flow path 13 is the outer cylinder 11.
Is connected to the heating fluid inlet casing 16 and the heating fluid outlet casing 17 via the seal mechanisms 30A and 30B, so that the internal spaces 16a and 17a of the heating fluid inlet casing 16 and the heating fluid outlet casing 17 are formed.
And communicate with each other. Therefore, the heating fluid K sent from the outside flows from the heating fluid inlet casing 16 into the flow path 13
Through the heated fluid outlet casing 17.
In this case, the heating fluid inlet casing 16 is arranged on the outlet 12b side of the inner cylinder 12, the heating fluid outlet casing 17 is arranged on the inlet 12a side of the inner cylinder 12, and the flow of the heating fluid K is
It flows in the direction opposite to the moving direction of the object to be processed H. That is, the flow of the heating fluid K is countercurrent to the flow of the workpiece H.
The heating fluid inlet casing 16 is formed in an annular shape concentric with the inner cylinder 12, as shown in FIG. The same applies to the heated fluid outlet casing 17. These casings 16 and 17 are fixedly attached to the gantry 2 and do not rotate.

The outlet side generated gas hood 19 is disposed outside the heating fluid inlet casing 16 and covers the outlet 12b of the inner cylinder 12. This exit side generated gas hood 1
A discharge port 19a for the generated gas is provided at the upper end of 9, and a discharge port 19b for discharging the treated solid P to the discharge hopper 6 is provided at the lower end. The inlet-side gas hood 20 is arranged outside the heating fluid outlet casing 17 and covers the inlet 12 a of the inner cylinder 12. A distal end of the charging device 4 penetrates the inlet gas hood 20 in an airtight manner, and the distal end is inserted into the inlet 12a of the inner cylinder 12. The inlet side gas hood 20 and the outlet side generated gas hood 19 are fixedly attached to the gantry 2 and do not rotate.

Next, details will be described. Inner and outer cylinder connection mechanism 18
A and 18B are configured as shown in FIGS. 4, 5, and 6. The inner and outer cylinder connecting mechanisms 18A and 18B are provided at intervals in the axial direction of the inner cylinder 12 and the outer cylinder 11, and a plurality of inner and outer cylinder connecting mechanisms 18A and 18B are arranged in the circumferential direction as shown in FIG. Has been done.

As shown in FIGS. 4 and 5, each of the inner and outer cylinder connecting mechanisms 18A and 18B penetrates the ring 51 welded and fixed to the outer peripheral surface of the inner cylinder 12 and the peripheral wall of the outer cylinder 11 and axially extends in the radial direction. A guide tube 54 fixed by welding, a connecting rod 53 having one end slidably inserted in the guide tube 54 and the other end fitted in central holes 52A and 52B of the ring 51, and an outer cylinder of the guide tube 54. 11 is a lid plate 56 joined to the outer end flange 55, and the distal end is screwed to the lid plate 56 and the tip is guided by the guide tube 54.
Adjustment bolt 57 that has entered the inside of the
The washer 58 attached to the tip of the connecting rod 53 is inserted between the washer 58 and the end surface of the connecting rod 53, and the connecting rod 53 is inserted into the inner cylinder 1.
The inner cylinder 1 is formed by a connecting rod 53 slidable with respect to the guide pipe 54, which is composed of a spring 59 that is pressed toward the second side.
2 and the outer cylinder 11 while absorbing the difference in thermal expansion in the radial direction,
It is connected so that it can transmit torque. The spring 59 keeps the connecting rod 53 from rattling or dropping by constantly pressing the connecting rod 53 toward the inner cylinder 12.
The adjusting bolt 57 and the washer 58 serve to regulate the pressing force of the spring 59 and to regulate the slidable amount of the connecting rod 53.

The inner and outer cylinder connecting mechanisms 18A and 18B, which are installed at intervals in the axial direction of the inner and outer cylinders 12 and 11, when both exert an axial restraining force, the thermal expansion difference between the inner and outer cylinders 12 and 11 in the axial direction. Therefore, as shown in FIG. 5, the central hole 52B of the ring 51 of one of the inner and outer cylinder connecting mechanisms 18B cannot be absorbed.
Is configured as an elongated hole that is long in the axial direction, and allows the relative movement of the connecting rod 53 and the ring 51 in the axial direction by a necessary amount. Other points are common.

Next, the seal mechanism 30A, 30B, 32A, 32B as an embodiment of the present invention will be described. The respective seal mechanisms 30A, 30B, 32A, 32B basically have almost the same configuration except for the place where they are provided.

First, with reference to FIG. 7, a seal mechanism 30A provided at a connecting portion between the inner end of the heating fluid inlet casing 16 and the end of the outer cylinder 11 will be described. In this case, the outer cylinder 11 is the rotating-side annular member (first annular member), and the heated fluid inlet casing 16 is the stationary-side annular member (second annular member). In this sealing mechanism 30A, a flange 11A that is substantially orthogonal to the rotation axis of the outer cylinder 11 is provided at the end of the outer cylinder 11, and the outer surface thereof is set as the sliding contact surface S.

On the outer surface of the side wall of the heating fluid inlet casing 16 facing the sliding surface S, an annular fixing flange 6 is provided.
1 is attached by a screw 69 (represented by a chain line for simplification). A movable flange 62 is arranged in parallel in front of the fixed flange 61 with a space therebetween, and an inner peripheral end of the fixed flange 61 and an inner peripheral end of the movable flange 62 are spaced apart from each other on the outer side of the inner cylinder 12. They are connected to each other by the expandable tube 63 provided. A space as a flow path for the heating fluid K is secured between the expansion tube 63 and the inner cylinder 12.

The moving flange 62 is pressed against the sliding surface S with an appropriate force by a spring (biasing member) 66 arranged between the fixed flange 61 and the moving flange 62, and at this mating surface. The gap between the connecting points is sealed. A contact surface between the moving flange 62 and the sliding surface S is coated with heat-resistant grease as a sealing substance. A plurality of the springs 66 are arranged at intervals in the circumferential direction, and the bolts 6 protruding from the fixing flange 61 are provided.
One end is inserted into 7. An adjusting nut 68 is screwed onto the bolt 67. By adjusting the position of the adjusting nut 68, the repulsive force of the spring 66 can be changed, and thereby the pressure contact force applied to the moving flange 62 can be adjusted.

The moving flange 62 is prevented from rotating with respect to the fixed flange 61 by the rotation stopping mechanism 70. A plurality of rotation stopping mechanisms 70 are arranged at intervals in the circumferential direction. Each rotation stopping mechanism 70 has an arm 71 fixed to the fixed flange 61 by welding and extending toward the moving flange 62, an arm 72 fixed to the moving flange 72 by welding extending toward the fixed flange 61, and an overlapping portion of both arms 71, 72. It consists of a bolt 74 that is penetrated and a nut 75 that fastens the arms 71 and 72 by screwing into the bolt 74, and the bolt through hole 73 of one arm 71 is formed as a long hole, so that the axial direction The arms 71 and 72 are connected to each other so as to allow the movement of the arms and to prevent relative rotation. As a result, the moving flange 62 is connected to the fixed flange 61 so that the distance between the two can be adjusted, and it is connected so as not to rotate.

The inner peripheral surface of the outer cylinder 11 and the casing 16
A hard heat insulating material 14 such as castable is attached to the inner peripheral surface of the, and a soft heat insulating material 65 such as rock wool is attached to the inner peripheral surface of the expandable tube 63. A support ring 64 is arranged on the inner peripheral side of the expandable tube 63 so as to prevent the heat insulating material 65 from falling off and the like, and is supported by the moving flange 61 or the fixed flange 61.

FIG. 8 shows a seal mechanism 30B provided at a connecting portion between the inner end of the heated fluid outlet casing 17 and the end of the outer cylinder 11. In this case, the outer cylinder 11 is the rotating side annular member (first annular member), and the heating fluid outlet casing 17 is the stationary side annular member (second annular member). In this sealing mechanism 30B, a flange 11B that is substantially orthogonal to the rotation axis of the outer cylinder 11 is provided at the end of the outer cylinder 11, and the outer surface thereof is set as the sliding contact surface S.
Other configurations are the same as those of the seal mechanism 30A in FIG.

FIG. 9 shows a seal mechanism 32A for sealing the gap between the heated fluid inlet casing 16, the outlet side generated gas hood 19 and the inner cylinder 12. In this case, the inner cylinder 12
Is a rotating side annular member (first annular member), and the heating fluid inlet casing 16 and the outlet side generated gas hood 19 are stationary side annular members (second annular member). This sealing mechanism 32A is a second sealing mechanism that seals between the outer end of the heating fluid inlet casing 16 and the end of the inner cylinder 12 (see FIG. 8).
(Corresponding to the sealing mechanism 30B of FIG. 7) and a third sealing mechanism (corresponding to the sealing mechanism 30A of FIG. 7) that seals between the inner end of the outlet side generated gas hood 19 and the end of the inner cylinder 12 together. It is a combination.

In this seal mechanism 32A, an annular fixing flange 80 is provided in an airtight manner on the outer periphery of the end portion of the inner cylinder 12, and an annular partition plate 81 can be detached from the fixing flange 80 (attachment and detachment of the expansion tube 63). Airtightly,
Both surfaces of the partition plate 81 are set as sliding contact surfaces S that are substantially orthogonal to the rotation axis. Then, the seal mechanism 30B shown in FIG. 8 is provided between the one sliding surface S of the partition plate 81 and the outer end side wall of the heating fluid inlet casing 16.
The other sliding surface S of the partition plate 81 and the outlet side generated gas hood 1
9 and the inner side wall of the sealing mechanism 3 shown in FIG.
0A is provided. As a result, both seal mechanisms 30
The moving flanges 62, 62 of A and 30B are brought into pressure contact with the sliding surfaces S on both sides of the partition plate 81 by the force of the spring 66, and sealing is performed at these mating surfaces.

Next, the operation will be described. In this external heat type rotary kiln 1, the outer cylinder 11 and the inner cylinder 12 which constitute the main part of the heating furnace are connected by inner and outer cylinder connecting mechanisms 18A and 18B,
Since the inner cylinder 12 is rotated by rotationally driving the outer cylinder 11, it is not necessary to largely extend both ends of the inner cylinder 12 to the outside of the heating furnace for rotational support. Therefore, as in this example, both ends of the inner cylinder 12 are connected to the outlet side generated gas hood 19
Also, it can be completely covered with the inlet side gas hood 20, thereby eliminating the portion exposing the inner cylinder 12 to the atmosphere, reducing the amount of heat dissipation to the atmosphere, and improving the thermal efficiency. . Also, the inner cylinder 1 to be housed in the heating furnace
Since the length of 2 can be increased, the heating efficiency of the inner cylinder 12 is improved and the rotary kiln 1 can be downsized.

Further, since the outer cylinder 11 is communicated with the heating fluid inlet casing 16 and the heating fluid outlet casing 17 via the seal mechanisms 30A and 30B, the outer cylinder 11 and the inner cylinder are passed through both casings 16 and 17. While rotating 12, the heating fluid is circulated in the flow path 13 between the inner and outer cylinders,
The inner cylinder 12 can be stably heated. In addition, by the seal mechanism 32A, 32B incorporating the partition plate 81,
Flow path of heating fluid (internal space 16 of casing 16, 17)
a, 17a) and the flow path of gas generated from the object to be treated (inner cylinder 1)
Since the two inlets 12a and 12b) are clearly separated,
It is possible to reliably prevent contact between the generated gas G and the heating fluid K from the inner cylinder 12. It is possible to prevent danger such as explosion.

When a difference in thermal expansion occurs between the outer cylinder 11 and the inner cylinder 12, the inner-outer cylinder connecting mechanism 18A shown in FIGS.
In 18B, the difference in thermal expansion in the radial direction is absorbed by the connecting rod 53 sliding in the guide tube 54 against the spring 59. Regarding the difference in thermal expansion in the axial direction,
The connecting rod 53 of the inner-outer tube connecting mechanism 18B shown in FIG. 5 moves inside the center hole (oblong hole) 52B of the ring 51 to absorb it.

Further, each sealing mechanism 30A, 30B, 32
In A and 32B, since the moving flange 62 is pressed against the sliding surface S by the force of the spring 66, the mating surface can secure the sealing property while absorbing the effect of thermal expansion, and the inner cylinder 12 and the outer cylinder 11 can be continuously and stably rotated. That is, the difference in thermal expansion in the radial direction is absorbed by the sliding surface S and the moving flange 62 sliding on each other, and the difference in thermal expansion in the axial direction is absorbed by the expansion and contraction of the expansion tube 63. At this time, since the moving flange 62 is brought into pressure contact with the sliding surface S by the spring 66 with an appropriate force, proper sealing performance is maintained. Further, even if the hoods 19 and 20 to which the fixed flange 61 is attached and the casings 16 and 17 are thermally deformed and tilted, a large number of springs 66 are arranged in the circumferential direction, so that between the moving flange 62 and the sliding surface S. A good contact state is secured with and the sealing performance is maintained.

Further, the sealing mechanism 30A, 30B, 32A, 32B of the rotary kiln 1 seals the seal box provided at the end of the heating furnace by feeding the sealing air having a pressure higher than the furnace pressure of the heating furnace. Since it is not a type that does not run, it does not incur a running cost and can secure a seal at the time of power failure.

It should be noted that the seal mechanism 32A (also the same for 32B) in which the partition plate 81 is incorporated is particularly shown in FIGS.
Changes can also be made as shown in 1. In the seal mechanism 132A shown in FIG. 10, the gland packing 85 is provided between the sliding surface S of the partition plate 81 and the mating surface of the moving flange 62.
Is additionally inserted. Heat resistant grease is supplied to the gland packing 85 through an oil supply hole (not shown). This sealing mechanism 132A is particularly effective when the pressure of the heating fluid is high.

Further, in the seal mechanism 232A shown in FIG. 11, the partition plate 81 and the fixed flange 8 that joins the partition plate 81 together.
An elastic plate 87, such as spring steel, is interposed between the elastic plates 87 and 1. By doing so, even if the fixed flange 80 is inclined, the partition plate 81 can be arranged so as to be orthogonal to the rotation axis of the inner cylinder 12, and the sliding of the moving flange 62 with respect to the sliding surface S of the partition plate 81. Dynamic resistance can be reduced.

As the seal material supplied to the sliding surface S, solid carbon or the like may be used in addition to the heat resistant grease, or a sliding material such as a copper ring may be incorporated in the sliding surface S. In addition, in the above-described embodiment, the inner cylinder 12 is slightly inclined with respect to the horizontal, but the inner cylinder 12 is installed horizontally without being inclined, and the blade for conveying the object to be processed is spirally fixed to the inner wall of the inner cylinder 12. Then, the object to be processed may be conveyed by the rotation of the blade due to the rotation of the inner cylinder 12.

Further, in the above embodiment, the case where the outer cylinder 11 which is the main part of the heating furnace is rotated so as to rotate the inner cylinder 12 following the rotation is shown. The sealing mechanism of the present invention can be used as the sealing means between the heating furnace and the inner cylinder for the external heating rotary kiln of the type that penetrates the rotating inner cylinder with respect to the provided heating furnace.

[0037]

As described above, according to the seal mechanism of the invention of claim 1, since the moving flange connected to the expansion tube is brought into pressure contact with the sliding contact surface by the force of the biasing member, The mating surfaces of the sliding contact surfaces can reliably seal the gap between the first and second annular members. The expansion and contraction tube absorbs the difference in thermal expansion between the first and second annular members in the axial direction, and the difference in thermal expansion in the radial direction is absorbed by sliding between the sliding contact surface and the mating surface of the moving flange. Therefore, even if there is a difference in thermal expansion,
The gap between the first and second annular members can be reliably sealed. Therefore, unlike the conventional example, it is not necessary to pressure-feed air for sealing, the running cost can be reduced, and the seal at the time of power failure can be secured, and the safety can be improved.

According to the second aspect of the present invention, since the moving flanges respectively connected to the expansion tubes are brought into pressure contact with the partition plates provided on the outer circumference of the inner cylinder, the partition plates and the fixed side annular members on both sides thereof are provided. The gap between them can be reliably sealed.
In addition, the expansion and contraction tube that connects the moving flange can absorb the difference in thermal expansion between the partition plate and the fixed-side annular member in the axial direction, and the sliding between the moving flange and the sliding surfaces on both sides of the partition plate allows the partition plate to slide. It is possible to absorb the difference in thermal expansion between the fixed side annular member and the fixed side annular member. Therefore, even if there is a difference in thermal expansion, it is possible to reliably seal the gap between the rotating inner cylinder and the fixed side annular member, prevent the generated gas from leaking from the inner cylinder, or heat the same with the generated gas. By preventing contact with the flame of the furnace and the heating fluid, the danger of explosion can be prevented.

According to the third aspect of the invention, since the inner cylinder is rotated by rotating the outer cylinder, it is not necessary to provide a rotation support mechanism or a rotation driving mechanism for the inner cylinder itself, and the inner cylinder exposed from the heating furnace is eliminated. The tubular portion can be made as small as possible, and the thermal efficiency can be improved. Further, although the outer cylinder is rotated, since the heating fluid is supplied and discharged through the fixedly arranged casing for supplying and discharging the heating fluid, the heating fluid can be reliably supplied and discharged. Moreover, since the seal mechanism according to claim 1 is arranged at the connecting portion between the casing and the outer cylinder, even if there is a difference in thermal expansion between the outer cylinder and the casing, the gap between the connecting portion between the outer cylinder and the casing is reliably sealed. The outer cylinder can be turned.

According to the invention of claim 4, as in the invention of claim 3, since the inner cylinder is rotated by rotating the outer cylinder, it is necessary to provide a rotation support mechanism and a rotation drive mechanism for the inner cylinder itself. The inner cylinder portion exposed from the heating furnace can be made as small as possible, and the thermal efficiency can be improved.
Further, although the outer cylinder is rotated, since the heating fluid is supplied and discharged through the fixedly arranged casing for supplying and discharging the heating fluid, the heating fluid can be reliably supplied and discharged. Further, since the sealing mechanism according to claim 2 is arranged as a means for sealing between the hood that covers the inlet and the outlet of the inner cylinder, the casing, and the inner cylinder, the difference in thermal expansion between the inner cylinder, the hood, and the casing. Even if there is, while surely sealing the gap between them,
The inner cylinder can be turned. Therefore, it is possible to reliably prevent the generated gas from coming into contact with the heating fluid from the inner cylinder.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an overall schematic configuration of an external heat type rotary kiln equipped with a sealing mechanism according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a sectional view taken along the line III-III of FIG.

FIG. 4 is a cross-sectional view of an inner / outer cylinder connecting mechanism 18A in FIG. 1.

5 is a cross-sectional view of an inner-outer tube connecting mechanism 18B in FIG.

FIG. 6 is an inner-outer cylinder connecting mechanism 18A, 1 shown in FIGS. 4 and 5;
It is sectional drawing which shows arrangement | positioning of 8B in the circumferential direction.

7A and 7B are detailed views of the seal mechanism 30A in FIG. 1, where FIG. 7A is a side sectional view and FIG. 7B is a plan view of a rotation stop mechanism 70.

8A and 8B are detailed views of the seal mechanism 30B in FIG. 1, where FIG. 8A is a side sectional view and FIG. 8B is a plan view of a rotation stop mechanism 70.

9A and 9B are detailed views of the seal mechanism 32A in FIG. 1, in which FIG. 9A is a side sectional view and FIG. 9B is a plan view of the rotation stopping mechanism 70.

10 is a side sectional view showing another example of the sealing mechanism of FIG.

11 is a side sectional view showing still another example of the sealing mechanism of FIG. 9. FIG.

[Explanation of symbols]

DESCRIPTION OF REFERENCE NUMERALS 1 external heat type rotary kiln 11 outer cylinder (rotating side annular member) 12 inner cylinder (rotating side annular member) 12a inlet 12b outlet 13 flow path 16 heating fluid inlet casing (casing, fixed side annular member) 17 heating fluid outlet casing (casing) , Fixed side annular member) 16a, 17a internal space 18A, 18B inner / outer cylinder connecting mechanism 19 outlet side generated gas hood (hood, fixed side annular member) 20 inlet gas hood (hood, fixed side annular member) 24 drive mechanism 30A, 30B Sealing mechanism 32A, 32B Sealing mechanism 63 Expansion / contraction tube 62 Moving flange 66 Spring (biasing member) 70 Rotation stop mechanism 81 Partition plate S Sliding surface

Claims (4)

[Claims] 1. An inner cylinder, which is driven to rotate to feed an object to be processed, which is fed from an inlet, moves to an outlet and discharges from the outlet, and a heating furnace arranged on the outer periphery of the inner cylinder to heat the inner cylinder. A seal mechanism provided between a rotary side annular member and a fixed side annular member facing the same in an external heat type rotary kiln having a rotary side annular member in the first annular member of the two annular members. Provide a sliding contact surface that is substantially orthogonal to the rotation axis of the member,
An annular moving flange, which is airtightly connected to the second annular member via an expansion tube, is brought into pressure contact with the sliding contact surface by the force of the biasing member, and the moving flange is axially moved with respect to the second annular member. A seal mechanism for an externally heated rotary kiln, characterized in that rotation is stopped using a rotation stop mechanism that allows only the movement of 2. The first annular member is the rotating inner cylinder, and the sliding surfaces are provided on both sides of an annular partition plate projecting on the outer periphery of the inner cylinder, and both sides of the partition plate are provided. In the second
Fixed side annular members as the respective annular members, and the fixed side annular members and the partition plates for sealing between the fixed side annular members as the respective second annular members and the partition plate. 2. A seal for an external heat type rotary kiln according to claim 1, further comprising: a moving flange, which is pressed against the sliding surface by the biasing member, and a rotation stopping mechanism for the moving flange. mechanism. 3. The heating furnace, wherein the heating furnace is located at an intermediate portion in the axial direction, is concentrically arranged on the outer circumference of the inner cylinder, and is driven to rotate by a drive mechanism, and the heating is fixedly arranged at both ends thereof. A casing for supplying and discharging fluid, and the inner cylinder is connected to the outer cylinder by an inner-outer cylinder connecting mechanism so that the inner cylinder rotates together with the outer cylinder, and the inner space of the casing and the gap between the inner cylinder and the outer cylinder. Is a flow path for the heating fluid, and the sealing mechanism according to claim 1 is provided as a sealing means between the connecting portion of the outer cylinder as the rotating side annular member and the casing as the stationary side annular member. External heat type rotary kiln sealing mechanism. 4. The heating furnace, which is located at an intermediate portion in the axial direction and is concentrically arranged on the outer circumference of the inner cylinder and driven to rotate by a drive mechanism, and a heating member fixedly arranged at both ends thereof. The inner cylinder is connected to the outer cylinder by an inner-outer cylinder connecting mechanism so that the inner cylinder rotates together with the outer cylinder, and both ends of the inner cylinder penetrate through the casing to form a casing. A hood is fixedly provided on the outside of each casing so as to block the inlet and outlet of the penetrating inner cylinder from the atmosphere, and the inner space of the casing and the gap between the inner cylinder and the outer cylinder form a flow path for the heating fluid. The sealing mechanism according to claim 2 is provided as means for sealing between the inner cylinder as the rotating side annular member and the casing and the hood as the two stationary side annular members. Externally heated rotary Kiln sealing mechanism.