JP2001165579A - Sealing device for rotary kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal device for a rotary kiln, which is capable of realizing sealing between the opening unit and the hood of the rotary kiln with a comparatively simple structure without depending on a labyrinth. SOLUTION: The rotary kiln 10 is provided with a hood 30 through a seal device 20 at the end of the same. The seal device comprises an annular movable side seal receiving plate 21 provided on the side of the rotary kiln, an annular fixed side seal receiving plate 22, provided on the side of the hood so as to be opposed to the movable side seal receiving plate through a gap, an annular seal member 23, provided so as to be abutted against the movable side seal receiving plate and the fixed side seal receiving plate to block a gap, and an energizing device for energizing the seal member toward the central direction of the rotary kiln. The seal member is constituted of a plurality of divided seal members, divided with respect to the peripheral direction of the same, while the energizing device is constituted of energizing mechanisms, comprising a lever, supported pivotally to the side of the hood through a bearing and whose one end is contacted with the divided seal member, and a spring member, energizing the other end side of the lever so that the one end of the same pushes the divided seal member and provided in every divided seal members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a structure in which an object to be treated introduced through an opening at one end is melted while being moved to the other end, and molten slag and exhaust gas are discharged from the opening at the other end. The present invention relates to a sealing device suitable for a rotary kiln.

[0002]

2. Description of the Related Art Generally, a rotary kiln has openings at both ends, and each opening is provided with other equipment via a hood. As other equipment, for example, an object to be treated is provided at one end (referred to as an inlet side) of the rotary kiln, and a secondary combustion tower is provided at the other end (referred to as an outlet side). The secondary combustion tower generally includes a facility for collecting and reburning gas discharged from the rotary kiln and detoxifying the exhaust gas, and a facility for discharging the discharged molten slag to the outside.

[0003] In any case, in such a rotary kiln, if the inside and the outside air communicate with each other, the temperature, pressure, oxygen concentration and the like inside the kiln change, and the combustion conditions fluctuate. For this reason, a sealing device is provided between the rotary kiln and the hood. This sealing device needs to be interposed between a rotary kiln that is rotating during operation and a hood that is always fixed to perform sealing.

An example of such a sealing device is disclosed, for example, in Japanese Patent Application Laid-Open No. 6-281348. This seal device is a seal device at a rotary connection portion between the rotary kiln body and the hood, and includes a rotating portion that rotates with the rotary kiln body and a fixed portion that does not rotate.

[0005] The rotary portion includes a seat welded to the rotary kiln body, a guide pin welded to the seat at predetermined intervals in the circumferential and axial directions of the rotary kiln body, and a seat surface of the seat. A flexible sealing material slidably provided, and two or more seal holding members each of which is divided into a plurality of rings in a ring shape having an H-shaped cross section and which are divided in the circumferential direction and the division positions are juxtaposed with each other in phase; The member, a tip ring fastened to the inner surface of the outer peripheral tip of the seal holding member, and the guide pin sandwiched at the center in the circumferential direction for each division of the seal holding member,
A bracket welded to the seal holding member, and a band with a coil spring, which is mounted on the outer peripheral surface of the cross member of the seal holding member by dividing into a plurality of parts, and each end face is connected by a coil spring having an adjustment bolt. Is provided.

On the other hand, the fixing portion includes a fixing base fixed to a foundation near the tip of the rotary kiln on the hood side, a fixing ring fixed to the fixing base, a cover ring fastened to the fixing ring, Of the inner circumference of the covering,
A tip ring holding member having an I-shaped cross section welded to a position opposite to the groove of the seal holding member; and a tip ring fastened to both end portions of the tip ring holding member. See the above publication).

[0007]

However, the above-mentioned sealing device has a problem that the structure is complicated because the sealing is realized by forming a labyrinth in the seal holding member having the H-shaped cross section. is there.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary kiln sealing device that can realize a seal between an opening of a rotary kiln and a hood with a relatively simple structure that does not depend on labyrinth.

[0009]

SUMMARY OF THE INVENTION The present invention is applied to a rotary kiln having a hood at an end on the opening side of a rotary kiln having at least one end opened through a sealing device, wherein the sealing device is a rotary kiln. A ring-shaped movable-side seal receiving plate provided on the hood side; a ring-shaped fixed-side seal receiving plate provided on the hood side to face the movable-side seal receiving plate via a gap; A ring-shaped seal member provided to abut the seal receiving plate and the fixed-side seal receiving plate to close the gap, and an urging means for urging the seal member toward the center of the rotary kiln Wherein the seal member comprises a plurality of divided seal members divided in a circumferential direction, and the urging means pivotally supports the hood side. A biasing mechanism comprising a lever having one end in contact with the split seal member and a spring member for biasing the other end of the lever so that the one end presses the split seal member. It is characterized by being provided for each.

In the present sealing device, the biasing mechanism provided for each of the divided seal members is provided so as to form a pair for each of two divided seal members adjacent to each other. The one end of each lever is provided so as to extend in a direction away from each other, and a coil spring is interposed between the other ends of each lever so that the one end of each lever serves as the divided seal member. It is urged to press.

In the present sealing device, the fixed-side seal receiving plate and the movable-side seal receiving plate are provided so as to form an angle close to about 90 degrees, and the divided seal member has a cross section substantially corresponding to the angle. It has a V-shape.

In the present sealing device, the joints of the divided seal members adjacent to each other are covered with a cover plate having a substantially V-shaped cross section, and only one end of the cover plate is fixed to the divided seal member. I have.

According to the present invention, there is also provided a ring-shaped movable seal receiving plate provided on the rotary kiln side, and a ring-shaped provided on the hood side opposed to the movable seal receiving plate via a gap. A fixed-side seal receiving plate, a ring-shaped seal member provided so as to abut on the movable-side seal receiving plate and the fixed-side seal receiving plate, and closing the gap; and Biasing means for biasing toward a center direction, wherein the seal member includes a plurality of divided seal members divided in a circumferential direction, and the biasing means extends over both of the divided seal members adjacent to each other. And a cover plate closing between the divided seal members adjacent to each other, and one end rotatably supported on the hood side and having one end thereof. An urging mechanism comprising a lever in contact with the lever and a spring means for urging the other end of the lever so that the one end presses the cover plate is provided for each of the divided seal members adjacent to each other. A rotary kiln sealing device is provided.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rotary kiln sealing device according to the present invention will be described below with reference to the drawings. Referring to FIG. 1, a hood 30 is attached to an end of the rotary kiln 10 on the outlet side via a sealing device 20.
Is provided. Needless to say, a similar sealing device is provided at the end of the rotary kiln 10 on the entry side, and the following describes the exit-side sealing device 20.

Referring also to FIG. 2 and FIG.
Is a ring-shaped movable-side seal receiving plate 2 fixed to a cylindrical support 11 provided around the rotary kiln 10.
1, a ring-shaped fixed-side seal receiving plate 22 provided on the hood 30 so as to face the movable-side seal receiving plate 21 via a gap, and a movable-side seal receiving plate 21 and a fixed-side seal receiving plate 22. And a biasing device for biasing the seal member 23 toward the center of the rotary kiln 10. Thus, the gap between the rotary kiln 10 and the hood 30 is completely closed by the support 11 and the sealing device 20.

The movable-side seal receiving plate 21 and the fixed-side seal receiving plate 22 are each composed of a plurality of divided members in the circumferential direction, and are made of a material such as iron or stainless steel. The seal member 23 is made of a heat-resistant material such as iron.

In this embodiment, the seal member 23 is also composed of twelve divided seal members 23-1 divided in the circumferential direction, and the biasing device is provided with twelve divided seal members 23-1 provided corresponding to each divided seal member 23-1. Of the urging mechanism 24. Each of the urging mechanisms 24 is rotatably supported on the hood 30 side and has one end thereof in contact with the divided seal member 23-1.
-1 and a spring member 24 for urging the other end of the lever 24-1 so that the one end presses the divided seal member 23-1.
-2. More specifically, each of the urging mechanisms 24 is provided so as to form a pair with each of the two divided seal members 23-1 adjacent to each other, and the pair of urging mechanisms 24 is the same as that of the respective levers 24-1. One end is provided so as to extend away from each other, and each lever 24-
1 a spring member 2 formed by an open coil spring between the other end sides
4-2, each lever 24-
The one end is urged to press the split seal member 23-1.

FIG. 4 shows the divided seal member 23-1, and FIG. 5 shows the relationship between the divided seal member 23-1 and the lever 24-1. Here, the divided seal member 23-
A connecting member 23-2 having a U-shaped cross section is fixed to the center of the connecting member 1 by welding or the like. One end of a lever 24-1 is rotatably supported in the U-shaped portion of the connecting member 23-2. You.

In this embodiment, in order to provide the fixed-side seal receiving plate 22, a ring-shaped plate member 25 having an L-shaped cross section is attached to the end surface of the hood 30 by welding or the like. The plate member 26 is attached by bolts or the like. The stationary-side seal receiving plate 22 is attached to an end surface of the plate member 26 on the rotary kiln side by welding or the like.

As shown in FIG. 6, the plate member 26 is composed of six divided plate members 2 which are divided into six in the circumferential direction.
6-1 to 26-6.

On the other hand, in order to support the lever 24-1 of the urging mechanism 24, a shaft support 27 is fixed to an end surface of the plate member 26 on the rotary kiln side by welding or the like. A through hole communicating with the plate member 26 and the shaft support 27 is formed, and a pin 28 for shaft support is inserted into the through hole. The lever 24-1 is rotatably supported by a pin 28.

FIG. 7 shows the lever 24-1 and the spring member 2
4-2, a bearing 24-24 supported by the pin 28, and a bearing 24 supported by the connecting member 23-2 in FIG. -13
With

FIG. 8 shows the relationship between the spring member 24-2 and the paired lever 24-1. Two pairs of levers 24-
A bolt 24-3 is inserted into one receiving portion 24-11. The nut between the two receiving portions 24-11 has a nut 2
4-4 and 24-5 are attached, and a spring member 24-2 is provided between the receiving portion 24-11 and the nut 24-5.
Is provided. One receiving portion 24-11 directly receives the spreading force of the spring member 24-2, and the other receiving portion 24-1.
1 receives the spreading force of the spring member 24-2 via the nut 24-4. Due to this spreading force, one end of the lever 24-1 presses the divided seal member 23-1 toward the center of the rotary kiln 10.

The movable-side seal receiving plate 21 is fixed to the support 11 so as to be inclined to the side opposite to the hood 30. On the other hand, the fixed-side seal receiving plate 22 is provided on the plate member 26 so as to form an angle close to 90 degrees with the movable-side seal receiving plate 21. In order to close the gap between the movable-side seal receiving plate 21 and the fixed-side seal receiving plate 22 facing each other at an angle close to 90 degrees, the divided seal member 23-1 has a cross section substantially corresponding to the angle V. It has a character shape. The V-shaped outer surface of the divided seal member 23-1 is formed between the movable seal receiving plate 21 and the fixed seal receiving plate 22.
Is in contact with In particular, since the movable seal receiving plate 21 is rotating during the operation of the rotary kiln 10, the divided seal member 23-1 comes into sliding contact with the movable seal receiving plate 21.

Further, in this embodiment, the joint between the adjacent divided members 23-1 is covered with a cover plate 29 having a substantially V-shaped cross section as shown in FIG. In particular, since the split seal member 23-1 expands and contracts in the circumferential direction due to the pressing force of the urging mechanism 24 and deforms in the radial direction of the rotary kiln 10, one end of the cover plate 29 is adapted to cope with these expansion and contraction and deformation. Only the side is fixed to one of the divided seal members 23-1. Further, since the divided seal member 23-1 has R (R) portions formed at both edges thereof, R portions are formed at both edges of the cover plate 29 in accordance with the R portions.

The above-described sealing device is also provided at the end of the rotary kiln 10 on the entry side. Of course, in the case of a rotary kiln having an opening only on one end side, a sealing device is provided only on this opening side.

With the above structure, the seal between the rotary kiln and the hood can be completely sealed with a much simpler structure than the seal device disclosed in the above-mentioned publication.

The number of divisions of the seal member 23 is not limited to 12, but may be any number. Further, a tension coil spring may be used for the spring member 24-2 instead of the compression coil spring. It is needless to say that the urging form by the tension coil spring in this case is different from the case of FIG. Furthermore, the rotation of the rotary kiln 10 tends to cause a deviation in the roundness of the outer periphery due to the rotation. In this case, it is conceivable that a gap is partially formed between the movable-side seal receiving plate 21 and the seal member 23 during the rotation of the rotary kiln 10. As such a countermeasure, a cushioning member, such as a cushion material, which acts to compensate for the irregularity of roundness may be interposed between the rotary kiln 10 and the support 11.

Next, a second embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the urging of the divided seal member 23-1 is performed via the cover plate 41. In other words, parts other than the sealing device 20 are the same as those in the first embodiment, and therefore, only the sealing device 20 will be described below. FIG. 10 is a view of the second embodiment viewed from the same direction as FIG. 2, but the rotary kiln 10, the support 11, the movable-side seal receiving plate 21, and the plate shown in FIG. The illustration of the member 26 is omitted.

The urging mechanism 24 'in the sealing device 20
Is a cover plate 41 provided so as to extend over both of the divided seal members 23-1 adjacent to each other and closing between the divided seal members 23-1 adjacent to each other, similarly to the first embodiment. A lever 24-1 rotatably supported on the hood side and having one end connected to the cover plate 41, and the other end of the lever 24-1 for urging the one end to press the cover plate 41. And an air cylinder mechanism 24-2 '. Such an urging mechanism 24 'is provided between each of the divided seal members 23-1 adjacent to each other. The connection structure between one end of the lever 24-1 and the cover plate 41 is as follows.
The structure may be the same as the structure shown in FIG.

In particular, the biasing mechanism 24 'is a pair of two biasing mechanisms 24' adjacent to each other. The pair of biasing mechanisms 24 'are provided so that the one ends of the respective levers 24-1 extend in a direction away from each other, and air is provided between the other ends of the respective levers 24-1. The one end of each lever 24-1 is urged to press the cover plate 41 by interposing the cylinder mechanism 24-1.

As described in FIG. 3, the fixed-side seal receiving plate 22 and the movable-side seal receiving plate 21 are provided so as to form an angle close to about 90 degrees. Although the divided seal member 23-1 has a substantially V-shaped cross section corresponding to the angle, the end of the divided seal member 23-1 is a triangular plate member 23-12 in order to prevent gas leakage through the end. It is blocked. In this embodiment, the divided seal member 23-
At least the portion of the upper end of 1 that is in contact with the cover plate 41 is closed by the plate member 23-13.

In the present embodiment, the bolts 42 are provided so as to penetrate the cover plate 41 in a loosely fitted state on the upper surface side of the plate member 23-13 and at positions corresponding to the divided seal members 23-1 adjacent to each other. Is erected. In particular, the head of the bolt 42 does not come into contact with the cover plate 41 so that the cover plate 41 can be freely moved in the radial direction. Further, the through hole of the bolt 42 in the cover plate 41 is
Elongate hole 41a that is slightly wider than the diameter of
And Thereby, the cover plate 41 is slidable in the circumferential direction with respect to the divided seal member 23-1. Note that the cover plate 41 is provided with one of the divided seal members 23.
What is necessary is just to be able to slide to -1. In this case, the relationship between the bolt 42 and the elongated hole 41a may be applied to one of the divided seal members 23-1, and the other may be fixed to the divided seal member 23-1.

In the first embodiment, a case where a coil spring is used as the spring means in the biasing mechanism, and the case where the air cylinder mechanism is used in the second embodiment has been described, but these can be interchanged. Yes, and other spring means, such as a gas spring, may be used.

[0035]

As described above, according to the present invention, the seal between the opening of the rotary kiln and the hood can be realized with a relatively simple structure that does not depend on the labyrinth.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment in which the present invention is applied between an end on the outlet side of a rotary kiln and a hood.

FIG. 2 is a view of the embodiment of FIG. 1 as viewed from the direction of arrow A in FIG.

FIG. 3 is an enlarged view of a portion B in FIG. 1;

FIG. 4 is a view showing a divided seal member used in the present invention.

FIG. 5 is a cross-sectional view of the divided seal member shown in FIG. 4 taken along a line C in FIG. 4;

FIG. 6 is a view showing a divided plate member used in the present invention.

FIG. 7 is a view showing a lever in a biasing mechanism used in the present invention.

FIG. 8 is a diagram showing a relationship between a spring member and peripheral elements in a biasing mechanism used in the present invention.

FIG. 9 is a view showing a cover plate used in the present invention.

FIG. 10 is a view of a second embodiment of the present invention as viewed from the same direction as FIG. 2;

FIG. 11 is a sectional view taken along line C of FIG. 10;

12 is a sectional view taken along line D in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rotary kiln 11 Support body 20 Seal device 21 Movable side seal receiving plate 22 Fixed side seal receiving plate 23 Seal member 23-1 Split seal member 24, 24 'Urging mechanism 24-1 Lever 24-2 Spring member 24-2' Air Cylinder mechanism 29, 41 Cover plate 30 Hood 42 Bolt

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J040 AA15 BA07 EA18 EA25 HA02 4K061 AA09 BA12 CA21 CA23

Claims (8)

[Claims] 1. A rotary kiln comprising a rotary kiln having an opening at least at one end side and a hood provided at an end on the opening side via a sealing device, wherein the sealing device comprises a ring-shaped movable side provided on the rotary kiln side. A seal receiving plate, a ring-shaped fixed-side seal receiving plate provided on the hood side to face the movable-side seal receiving plate via a gap, the movable-side seal receiving plate and the fixed-side seal receiving plate A ring-shaped seal member provided so as to abut the seal member and closing the gap; and urging means for urging the seal member toward a center direction of the rotary kiln, wherein the seal member has a circumferential direction. The biasing means is rotatably supported on the hood side and has one end provided with the divided seal member. A biasing mechanism is provided for each of the divided seal members, the biasing mechanism including a lever in contact with the divided seal member, and a spring means for biasing the other end of the lever so that the one end presses the divided seal member. A rotary kiln sealing device, characterized in that: 2. The sealing device according to claim 1, wherein the biasing mechanism provided for each of the divided seal members is provided so as to form a pair for each of two divided seal members adjacent to each other, and forms a pair. The biasing mechanism is provided so that the one end sides of the respective levers extend in a direction away from each other, and the spring means is interposed between the other end sides of the respective levers so that the one ends of the respective levers are provided. A rotary kiln sealing device, which is urged to press the divided seal member. 3. The seal device according to claim 1, wherein the fixed-side seal receiving plate and the movable-side seal receiving plate have a thickness of about 9 mm.
A rotary kiln sealing device, wherein the seal member is provided so as to form an angle close to 0 degrees, and the divided seal member has a substantially V-shaped cross section corresponding to the angle. 4. The sealing device according to claim 3, wherein a seam of the divided sealing members adjacent to each other has a cross section substantially V-shaped.
A rotary kiln sealing device, wherein the sealing device is covered with a cover plate having a character shape, and only one end of the cover plate is fixed to the divided sealing member. 5. A rotary kiln in which a hood is provided at an end on the opening side of a rotary kiln having at least one end side opened via a sealing device, wherein the sealing device is a ring-shaped movable side provided on the rotary kiln side. A seal receiving plate, a ring-shaped fixed-side seal receiving plate provided on the hood side so as to face the movable-side seal receiving plate via a gap, the movable-side seal receiving plate and the fixed-side seal receiving plate A ring-shaped seal member provided so as to abut the seal member and closing the gap; and urging means for urging the seal member toward a center direction of the rotary kiln, wherein the seal member has a circumferential direction. The biasing means extends over both of the divided seal members adjacent to each other. A cover plate closing the space between the divided seal members adjacent to each other, a lever rotatably supported on the hood side, one end of which is in contact with the cover plate, and a lever other than the lever. A spring mechanism for urging the end side so that the one end presses the cover plate is provided for each of the divided seal members adjacent to each other. apparatus. 6. The sealing device according to claim 5, wherein the urging mechanisms provided between the divided seal members adjacent to each other are paired with two urging mechanisms adjacent to each other. The urging mechanism is provided such that the one end sides of the respective levers extend in a direction away from each other, and a spring means is interposed between the other end sides of the respective levers to thereby form the one end of each lever. Is urged to press the cover plate. 7. The seal device according to claim 5, wherein the fixed-side seal receiving plate and the movable-side seal receiving plate are about 9 inches.
Provided so as to form an angle close to 0 degrees, the split seal member has a substantially V-shaped cross section corresponding to the angle,
A rotary kiln sealing device characterized in that at least its end is closed. 8. The sealing device according to claim 5, wherein at least one end of the cover plate is provided so as to be slidable at least in a circumferential direction with respect to at least one of the divided seal members adjacent to each other. Features a rotary kiln sealing device.