JPH06229678A - Sealing device for rotary kiln - Google Patents

Abstract

PURPOSE:To support a movable cylinder substantially concentrically with a kiln body by providing a support plate in which plate a plurality of support rods extending parallely axially are provided on one of the outer periphery of the movable cylinder and that of a duct cylinder and a plurality of supprort holes to which the support rods are freely fitted are provided on the other. CONSTITUTION:A cylindrical kiln body 1 laid slantingly upwardly at the right is connected at its upper end side in the inclination direction with a movable end side duct portion 5, and a sealing device 20 is provided at a location between the external peripheral surfaces thereof. The sealing device 20 includes a movable cylinder 21 provided substantially concentrically with the kiln body 1 and a bellows-shaped sealing cylinder 26 provided between the movable cylinder 21 and a cylinder wall 5b of the end of the duct 5. Further, a plurality of support rods 23 exctending axially parallely toward the side of the duct 5 are fixedly mounted on a tongue-shaped plate 22 provided on the movable cylinder 22, and each support rod 23 is freely fitted into a support hole 25b in a support plate 25 fixedly mounted on the external peripheral surface of the duct 5 through a mounting bracket 24 to support the duct 5 substantially concentrically with the kiln body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary kiln sealing device used for heat treatment of various raw materials.

[0002]

2. Description of the Related Art A specific example of the above rotary kiln is disclosed in, for example, Japanese Patent Laid-Open No. 3-251683.
As shown in FIG. 5, the apparatus includes a horizontally long tubular kiln main body 51, and the kiln main body 51 has an annular tire portion 52.
It is rotatably supported from the lower side at a portion 52. Further, by driving the sprocket 53 provided on the outer peripheral surface by a motor (not shown), the kiln body 51
To be able to rotate.

Raw material powder is supplied to the kiln body 51 through an inlet side duct portion 54 on the left end side in the drawing,
This is sent to the right end side as the kiln body 51 rotates. At this time, a predetermined heat treatment is applied by the heating means 55 provided on the outer circumference of the kiln body 51, and the product powder after the heat treatment is recovered through the outlet duct section 56 on the right end side.

Sealing devices 57 and 58 for sealing the inside of the kiln body 51 from the external atmosphere are provided between the duct portions 54 and 56 and the kiln body 51. As such a sealing device, in addition to being airtight against relative rotational movement in a portion where the fixed portion and the rotating portion face each other, at least one end side of the kiln body 51 due to thermal expansion.
It is necessary to be able to tolerate a change in the axial length of the. Therefore, in the sealing device 58 on the right end side of the above device, as shown in FIG. 6A, an annular frame body 61 is provided on the outer peripheral side of the end of the kiln body 51. The frame body 61 includes an outlet side duct portion 56.
By a rail 62 extending from the rail 62, a position substantially concentric with the kiln body 51 is maintained, and the rail 62 is movably supported in the axial direction.

On the left end side of the frame body 61,
As shown in FIG. 6B, a ring-shaped seal plate 63 that expands in the radial direction is provided. On the other hand, a brim-shaped disc plate 64 facing the seal plate 63 is provided on the outer peripheral surface of the kiln body 51, and a seal is provided to keep the distance between the disc plate 64 and the seal plate 63 constant. Board 6
3, a pair of guide rollers 65, 65 for sandwiching the outer end side of the disk plate 64 and guiding it rotatably are attached.

A seal member 66 made of an elastic material and having a V-shaped cross section is disposed between the seal plate 63 and the disc plate 64 which are held at a constant interval as described above. The seal member 66 is fixed to the disc plate 64 on the inner end side while the outer end side is pressed against the seal plate 63.
As a result, airtightness is provided against relative rotational movement between the rotating kiln body 51 and the non-rotating frame body 61.

With the above structure, the frame body 61 follows the axial displacement of the end of the kiln body 51, but the frame body 61 is allowed to move in the axial direction to allow the frame body 61 to move. In order to seal the space between the outlet duct section 56 and the outlet side duct section 56, the both 61 and 56 are connected by a bellows-shaped sealing cylinder 67, whereby the whole of the kiln body 51 to the outlet side duct section 56 is It is configured to seal from the outside atmosphere.

[0008]

However, in the above apparatus, the frame body 61 is constituted by the rails 62 and the like for supporting the frame body 61 in a substantially concentric state with respect to the kiln body 51 and slidably supporting it in the axial direction. The support structure and the pressure holding structure including guide rollers 65, 65 and the like for keeping the distance between the disc plate 64 and the seal plate 63 constant and keeping the contact state of the seal member 66 with the seal plate 63 are provided. , Because they are independent of each other,
The whole structure is complicated. As a result, the number of parts increases and the number of types of assembly parts required increases, which complicates management of component parts and assembly work, which causes a problem that the overall manufacturing cost increases. There is. In addition, uneven thermal expansion of the kiln body 51,
Or, a positional deviation occurs in the kiln axial direction or the circumferential direction due to uneven wear of the tire portion 52 that supports the kiln body 51,
The frame body 61 and the kiln main body 51 cannot maintain the concentric position by the rail 62, and the sealing performance may be deteriorated.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to make a simpler structure, thereby making it possible to reduce the total manufacturing cost. To provide a rotary kiln sealing device.

[0010]

In order to achieve the above object, a sealing device for a rotary kiln according to the present invention includes a tubular kiln body which is rotationally driven, and a duct portion which covers an end of the kiln body. A movable cylinder that is movable in the axial direction is provided between the movable cylinder and the kiln body, and a sealing member that seals between the movable cylinder and the rotating kiln body is provided between the movable cylinder and the kiln body. A sealing device for a rotary kiln, in which a duct and a duct part are connected by an axially expandable / contractible sealing cylinder, and a plurality of devices extending parallel to the axial direction are provided on one of the outer circumference of the movable cylinder and the outer circumference of the duct part. Is provided with a supporting plate having a plurality of supporting holes corresponding to the supporting rods, and the supporting rods are loosely fitted into these supporting holes to allow the movable cylinder to be almost flush with the kiln body. Concentric support and this The dynamic barrel biasing means for biasing in order to press the kiln main body, is characterized in that is provided around each support rod is brought into contact at one end to the support plate.

[0011]

In the above construction, for example, the support rod provided on the outer periphery of the movable cylinder is loosely fitted into the support hole formed on the support plate provided on the outer periphery of the duct portion, so that the movable cylinder is connected to the kiln body. A support structure is provided for axially movably supporting in a substantially concentric state. Then, the movable cylinder is pressed toward the kiln body by a simple structure in which the biasing means composed of, for example, a compression coil spring is provided on the outer circumference of the support rod in the above-mentioned support structure. A pressure holding structure is provided that applies a pressing force in the axial direction to the seal member between them. That is, among the respective structures for giving the support function and the pressure holding function,
The support rod and the support plate are also used, which makes the overall configuration simpler. As a result, for example, the number and types of assembled parts are reduced, and the management and assembly work of the parts are facilitated, so that the overall manufacturing cost can be reduced.

[0012]

【Example】

[Embodiment 1] One embodiment of the present invention will be described with reference to FIGS.
The explanation is based on the following.

As shown in FIG. 3, the rotary kiln according to the present embodiment includes a tubular kiln body 1 which is horizontally placed with a slight inclination to the right in FIG. Although not shown, the kiln body 1 is provided with annular tire portions on both end sides of the outer peripheral surface and is rotatably supported by these tire portions. Further, on the outer peripheral surface of the kiln body 1, a sprocket connected to a motor (not shown) by a chain is provided, and by driving the motor, the kiln body 1 maintains the inclined state as described above. It is driven to rotate about its axis.

The tire portion is supported so that its axial movement is restricted on the left end side in the figure, while it is supported on its right end side while allowing axial movement.
Therefore, when the long kiln body 1 expands and contracts in the axial direction by thermal expansion, the left end side is used as a reference and the right end side is displaced in the axial direction.

On the left end side of the kiln body 1, that is, on the fixed end side where the positional change does not substantially occur due to the thermal expansion as described above, a fixed end side duct portion 2 covering the opening of this portion is connected. A heat exchanger 3 is further connected to the fixed end side duct portion 2, and air is supplied into the kiln body 1 through the heat exchanger 3 and the fixed end side duct portion 2 sequentially. Further, the fixed end side duct part 2 is provided with an oil burner 4 penetrating the fixed end side duct part 2. The combustion port of the oil burner 4 is located on the left end side in the kiln body 1, and thereby the air supplied into the kiln body 1 through the fixed end side duct portion 2 is heated.

On the other hand, on the right end side of the kiln body 1, that is, on the movable end side where axial displacement according to thermal expansion occurs, a movable end side duct portion 5 is provided to cover the opening of this portion. The tip of the movable end side duct portion 5 is a chimney 6
The exhaust duct 7 connected to the exhaust duct 7 is connected to the exhaust duct 7, and the first and second dust collectors 8 and 9 and the exhaust blower 10 are connected to the exhaust duct 7.
Are installed in sequence. Further, the movable end side duct portion 5 is further provided with a raw material supply device 11 including a conveying screw.
Is attached, and by this raw material supply device 11,
The raw material powder is supplied to the right end side in the kiln body 1.

A seal device 20 as shown in FIG. 2A is provided at a position between the outer peripheral surfaces of the kiln body 1 and the movable end side duct portion 5. As shown in FIG. 1, the sealing device 20 is configured by providing a movable cylinder 21 that is slidable in the axial direction between the kiln body 1 and the movable end side duct portion 5 in a substantially concentric manner with the kiln body 1. ing. On the outer peripheral surface of the movable cylinder 21, an annular brim-shaped plate 22 that spreads outward is joined at approximately the center, and the brim-shaped plate 22 is axially moved toward the movable end side duct portion 5 side. Support bolts (support rods) 23 extending parallel to the direction are further joined. On the other hand, an appropriate number of mounting brackets 24 are fixed in the circumferential direction on the outer peripheral surface of the movable end side duct portion 5, and a support plate 25 having an L-shaped cross section is fixed to these mounting brackets 24. There is. A support hole 25b penetrating in the axial direction is formed in the vertical plate portion 25a of the support plate 25, and the support bolt 23 is loosely fitted in the support hole 25b.

As shown in FIG. 2 (b), the support bolts 23 are provided at 36 positions, for example, at intervals of 10 degrees, over the entire circumference of the collar plate 22. The support bolts 23 are held substantially concentrically with the kiln body 1 as shown in FIG.
By being loosely fitted in, it is in an assembled state in which it is slidable in the axial direction.

On the other hand, as shown in FIG. 1, the movable end side duct portion 5 is provided with a short cylindrical wall 5b having a diameter slightly smaller than the outer peripheral wall surface 5a thereof so as to project toward the kiln body 1 side. There is. A bellows-shaped sealing cylinder 26 is provided between the cylindrical wall 5b and the end of the movable cylinder 21 on the side of the movable end side duct 5, so that the entire space is covered. Has become. This sealing cylinder 26
Is a composite having a heat resistance of about 250 ° C. or more that substantially does not allow air to permeate and covers a sheet made of an inorganic fiber such as glass fiber, carbon fiber or alumina fiber with a heat resistant resin substance such as silicon rubber or Teflon. Composed of materials.

At the end of the movable cylinder 21 on the kiln body 1 side, an annular sliding seal made of a gland packing mainly made of aromatic polyamide fiber having excellent abrasion resistance and having a heat resistant temperature of about 260 ° C. A body (seal member) 27 is provided. In addition to the above-mentioned materials, the sliding seal body 27 may be made of econole resin, or a metal having a smooth surface. The sliding seal body 27 having a rectangular cross section is assembled by sandwiching the movable cylinder 21 between the inner and outer retaining rings 28 and 29. Further, between the pressing rings 28 and 29 and the inner and outer surfaces of the sliding seal body 27, in order to improve the heat resistance of the sliding seal body 27, an annular heat resistant sheet made of an elastic body such as natural rubber is further formed. It is configured by sandwiching 30 and 31.

On the other hand, the kiln body 1 has an annular seal plate 3 which covers the outer periphery of the end of the kiln body 1 over the entire circumference.
Two are joined. Vertical face plate portion 3 of this seal plate 32
The surface on the movable end side duct portion 5 side of 2a is formed as a sealing surface having a smooth surface, and the sliding seal body 27 provided on the end portion of the movable cylinder 21 as described above faces this sealing surface. And is located. Like the seal body 27, the vertical face plate portion 32a may be made of engineering plastic having low sliding resistance, for example, econole resin.

Then, in order to press the sliding seal body 27 against the above-mentioned sealing surface over the entire circumference, the compression coil springs (biasing means) 3 are respectively provided on the outer circumferences of the support bolts 23.
3 are provided. The compression coil spring 33 is a washer 35 whose movement to the kiln body 1 side is restricted by a fixed nut 34 screwed at a midway position of the support bolt 23.
And the vertical surface plate portion 25a of the support plate 25. Therefore, the spring force of the compression coil spring 33 acts as a force that pushes the movable cylinder 21 toward the kiln body 1 side, and as a result, the sliding seal body 27 is pressed against the seal surface of the seal plate 32. Retained.

Inside the sealing device 20 having the above-mentioned structure, a cylindrical heat shield sheet 36 extending from the outer periphery of the cylindrical wall 5b in the movable end side duct portion 5 to the kiln body 1 side.
Are provided, and the heat shield sheet 36 functions as a heat shield plate of the sealing device 20.

Next, the operating state of the rotary kiln having the above-mentioned structure will be described, taking as an example the case of firing aluminum hydroxide powder to produce aluminum oxide.

By operating the exhaust blower 10 and igniting the oil burner 4, as shown by the solid arrow in FIG. 3, the air sequentially passes through the heat exchanger 3 and the fixed end side duct portion 2 and the kiln body. 1 is supplied to the inside of the oil burner 1, and the heat of combustion in the oil burner 4 causes air to
It is heated to about 00 ° C. This air is the kiln body 1
It will flow inside toward the movable end side duct part 5 side.

On the other hand, the raw material supply device 11 supplies the raw material powder of aluminum hydroxide containing about 10% of water to the movable end side duct portion 5 side in the kiln body 1. Then, as the kiln body 1 is rotationally driven, the raw material powder is stirred and along the inclination direction, in the figure,
As indicated by the broken line arrow, it flows toward the fixed end side duct portion 2 side. As a result, countercurrent heat exchange between the heated air and the raw material powder is performed in the kiln body 1, and the aluminum hydroxide is fired to become aluminum oxide as the product powder. This product powder is recovered from the inside of the kiln body 1 to the outside through the fixed end side duct portion 2 and the heat exchanger 3. In the heat exchanger 3, countercurrent heat exchange between the product powder in a high temperature state and air is performed, whereby preheated air is supplied into the kiln body 1, while
The product powder is cooled and collected outside.

On the other hand, the air that has passed through the kiln body 1 is discharged into the atmosphere through the chimney 6 after the powder contained in the first and second dust collectors 8 and 9 is separated. The powder separated by the first and second dust collectors 8 and 9 is returned to the inside of the kiln body 1 and the above-mentioned treatment is performed together with the raw material powder supplied through the raw material supply device 11.

By the way, the air flowing in the kiln body 1 is heated to about 1200 ° C., and then the temperature thereof is lowered by heat exchange with the raw material powder, and the air is discharged from the movable end side duct portion 5 side. When the temperature of the exhaust gas when the air is discharged through the movable end side duct portion 5 is low, the combustion gas containing sulfuric acid condenses and causes wall corrosion, so in order to prevent this, for example, 150 ° C or higher. Need to hold.

Therefore, the rotation and axial displacement of the kiln body are permitted between the rotary kiln of the related art, which is not provided with the sealing device as in this embodiment, that is, between the movable end side duct part and the kiln body. In a rotary kiln configured with a minimum clearance, it is necessary to burn a large amount of fuel with an oil burner in order to prevent excessive temperature drop of exhaust gas due to air leaking from the outside through the above clearance. However, the fuel consumption was greatly reduced.

However, in the present embodiment, a seal device 20 is provided between the kiln body 1 and the movable end side duct portion 5 to seal the gap therebetween. That is, FIG.
As shown in FIG. 5, the spring force of the compression coil spring 33 acts as a force for pressing the movable barrel 21 to the left in the figure, and as a result, it is provided at the end of the movable barrel 21. The sliding seal body 27 is held in close contact with the seal surface of the vertical plate portion 32a of the seal plate 32. Even when the axial length of the kiln body 1 changes due to thermal expansion, the support bolts 23 are loosely fitted in the support holes 25b of the vertical surface plate portion 25a. When the end position of the kiln body 1 moves to the left, the support bolt 23 moves to the left due to the spring force of the compression coil spring 33, and when the end of the kiln body 1 moves to the right. The support bolt 23 moves rightward against the spring force of the compression coil spring 33. That is, the movable cylinder 21 follows the movement of the end of the kiln body 1 in a state in which the sliding seal body 27 is always kept in close contact with the vertical face plate portion 32a. As a result, the kiln body 1
The sealing property against the relative rotational movement between the movable cylinder 21 and the movable cylinder 21 is maintained.

At the same time, the movable cylinder 21 and the movable end side duct portion 5
Since the space between and is covered with the bellows-shaped sealing cylinder 26, the above-described sealed state in which the axial movement is allowed is maintained, and therefore, the kiln body 1 to the movable end side duct portion 5 are retained. The entire sealability up to is secured.

As a specific numerical example of actual operation using the rotary kiln of the above-mentioned embodiment, first, as described above, the rotation of the kiln main body is between the movable end side duct part and the kiln main body. The air leak amount in the conventional rotary kiln configured to have the minimum clearance allowing the axial displacement and the axial displacement was 12,600 Nm ³ / m ² · Hr, but in the present embodiment, this is 1,300 Nm ³ / m ² · Hr. It was Nm ³ / m ² · Hr. Then, in comparison with the amount of oil used to bring the exhaust gas temperature to about 200 ° C. in the conventional rotary kiln, in the rotary kiln of the present embodiment, the exhaust gas temperature is 227 even if the amount of used oil is reduced by 7.5%. It is possible to maintain the temperature around ℃.

As described above, in the rotary kiln sealing device of the present embodiment, the support bolts 23 provided on the outer circumference of the movable cylinder 21 are fixed to the outer circumference of the movable end side duct portion 5. By being loosely fitted in the support holes 25b of 25, a support structure is provided for supporting the movable cylinder 21 substantially concentrically with the kiln body 1 and movably supporting it in the axial direction. Then, with a simple structure in which a compression coil spring 33 is provided on the outer periphery of the support bolt 23 in this support structure, an axial pressing force is applied to the sliding seal body 27 between the movable cylinder 21 and the rotating kiln body 1. The pressure holding structure is configured by this.

That is, in the above description, the support bolt 23 and the support plate 25 are also used in the structure that provides the support function and the pressure holding function, respectively. Therefore, the overall structure is simpler. Has become. As a result, for example, the number and types of assembled parts are reduced, and the management of parts and the assembling work are facilitated, so that it is possible to manufacture at lower cost.

In the above embodiment, one end of the support bolt 23 is welded to the collar plate 22 of the movable cylinder 21,
An example was given in which the other end side was loosely fitted in the support hole 25b of the support plate 25. However, for example, one end of the support bolt 23 is fixed to the movable end side duct portion 5 side, and in this case, the flange shape of the movable cylinder 21 is formed. Board 22
It is also possible to adopt another structure such that the other end side of the support bolt 23 is loosely fitted in a support hole provided in the support plate as a support plate.

[Embodiment 2] Another embodiment of the present invention will be described below with reference to FIG. For convenience of explanation, members having the same functions as those of the members shown in the drawings of the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The sealing device 20 of this embodiment includes a movable barrel 21.
An intermediate tube 41 is further provided between the sliding seal body 27 and the sliding seal body 27. On the left end side of the intermediate cylinder 41 in the drawing, the pressing ring 28.
9 、 Heat resistant sheet 30 ・ 31 fixed, heat resistant sheet 30 ・
The sliding seal body 27 is sandwiched and held on the left end side between 31.

On the other hand, on the left end side of the movable cylinder 21, concentric ring members 42 and 43 are extended so as to have a U-shaped cross section.
Two packings (hereinafter,
44 and 45 (referred to as slider packings) are axially stacked and fitted. The right end side of the intermediate cylinder 41 is fitted between the ring bodies 42 and 43, and the right end surface of the intermediate cylinder 41 contacts the slider packings 44 and 45 from the left side. Therefore, in this configuration, the intermediate cylinder 41 also includes the slider packings 44 and 45.
A circumferential sliding motion is generated on the shaft so that it can rotate in the circumferential direction. In addition, in the outer ring body 43,
An oil supply port 46 for supplying a lubricating liquid is provided in the slider packings 44 and 45.

In the above structure, the width of the slider packings 44 and 45 is smaller than that of the sliding seal body 27. Therefore, the pressing force per unit area of the compression coil spring 33 toward the kiln body 1 is for sliding. The slider packings 44 and 45 are larger than the seal body 27. As a result, in the normal operating state, the intermediate cylinder 41
In the same manner as in the above embodiment, the sliding seal body 27 slidably contacts the seal plate 32 on the kiln body 1 side,
At this portion, a sealing property against relative rotational movement is provided. On the other hand, for example, the axial expansion / contraction deformation caused by the thermal expansion of the kiln body 1 becomes uneven in the circumferential direction, and the pressing load of the sliding seal body 27 on the seal plate 32 becomes uneven, and a twisting load is generated. However, when the sliding resistance of the sliding seal body 27 with respect to the seal plate 32 becomes excessively large, the sliding movement of the slider packings 44 and 45 with respect to the movable cylinder 21 occurs. As a result, the intermediate cylinder 41 is also rotated with the kiln body 1.

As described above, when an excessive pressing force is locally generated on the sliding seal body 27, the sliding operation of the sliding seal body 27 with respect to the seal plate 32 is suppressed, and the whole is surrounded. Slider packing 44/45
Since the sliding motion is generated on the side, deformation such that the contact surface of the sliding seal body 27 against the seal plate 32 is locally worn and the sealing performance is deteriorated is suppressed. As a result, it is possible to better maintain the overall sealing property.

In each of the above embodiments, the rotary kiln having the sealing device 20 provided between the kiln body 1 and the movable end side duct portion 5 has been described as an example. In a device or the like that is supported so that displacement due to thermal expansion occurs at both left and right ends, the sealing device 20 as described above is used for the kiln body 1 and the fixed end side duct portion 2.
It is also possible to provide between and. Further, in each of the above-mentioned embodiments, the rotary kiln used for firing aluminum oxide is taken as an example, but the present invention can be applied to a rotary kiln used for heat treatment of other raw materials.

[0042]

As described above, the rotary kiln sealing device of the present invention is provided with a plurality of support rods extending in parallel to the axial direction on one of the outer periphery of the movable cylinder and the outer periphery of the duct portion, and on the other. A support plate having a plurality of support holes corresponding to each support rod is provided, and each support rod is loosely fitted in the support holes to support the movable cylinder substantially concentrically with the kiln body. An urging means for urging the tongue toward the kiln body is provided around each support rod with one end in contact with the support plate.

Therefore, a support function for supporting the movable cylinder in a substantially concentric state with respect to the kiln body and movably in the axial direction, and a seal for sealing relative rotational movement between the movable cylinder and the kiln body. In order to press the member in the axial direction, it has a structure in which the supporting rod and the supporting plate are also used in the structure that respectively provides the pressing holding function of pressing the movable cylinder.
The whole structure becomes simpler, and as a result, for example, the number and types of assembly parts are reduced, and the management and assembly work of parts are facilitated, so that the overall manufacturing cost can be made cheaper. Has the effect.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a sealing device for a rotary kiln according to an embodiment of the present invention.

FIG. 2 is a view showing a connecting portion between the kiln body and the movable end side duct portion in the rotary kiln, as shown in FIG.
Is a cross-sectional view, and FIG. 6B is a half cross-sectional view taken along the line AA in FIG.

FIG. 3 is a schematic diagram showing an overall configuration of a processing apparatus including the rotary kiln.

FIG. 4 is a cross-sectional view of essential parts showing a seal device for a rotary kiln according to another embodiment of the present invention.

FIG. 5 is a front view showing the configuration of a conventional rotary kiln.

6A and 6B show a sealing device in the rotary kiln shown in FIG. 5, in which FIG. 6A is a plan view of a main part and FIG.
FIG. 4 is a sectional view of a main part.

[Explanation of symbols]

 1 Kiln Main Body 5 Movable End Duct Section 20 Sealing Device 21 Movable Tube 23 Support Bolt (Support Rod) 25 Support Plate 25b Support Hole 26 Sealing Cylindrical Body 27 Sliding Sealing Body (Seal Member) 33 Compression Coil Spring (Biasing Means) )

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Kondo 5-1 Sokai-cho, Niihama-shi, Ehime Sumitomo Chemical Co., Ltd.

Claims (1)

[Claims] 1. A movable cylinder that is movable in the axial direction is provided between a cylindrical kiln body that is driven to rotate and a duct section that covers the end of the kiln body, and the movable cylinder and the kiln body are connected to each other. A seal member for sealing between the movable cylinder and the rotating kiln body is provided between the movable cylinder and the duct portion, and the rotary kiln is formed by connecting the movable cylinder and the duct portion with a sealing cylinder that is axially expandable and contractible. In the sealing device, a plurality of support rods extending in parallel to the axial direction are provided on one of the outer periphery of the movable cylinder and the outer periphery of the duct portion, and a plurality of support holes corresponding to the respective support rods are formed on the other. Support plates are provided, and the support rods are loosely fitted into these support holes to support the movable cylinder substantially concentrically with the kiln body, and also to urge the movable cylinder toward the kiln body side. Means for abutting one end on the support plate The rotary kiln sealing device is characterized in that it is provided around each supporting rod.