JPH033913Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sealing device provided between a rotary cylinder and a fixed hood of a rotary kiln.

[Conventional technology]

Conventionally, a simple sealing device between the rotary kiln's rotary cylinder and the fixed hood is a rotary kiln's rotary cylinder 1 as shown in Fig. 3.
A housing body 2 integrally formed with a shell is provided with a seal ring 3 projecting outward, and a fixed cylindrical body 5 surrounding the outer periphery of the rotating cylinder from a fixed hood 4.
There is a device in which a fixed cylindrical body 5 is provided with a fixed seal ring 6 in sliding contact with the seal ring 3 at the tip of the fixed cylindrical body 5, but in the case of a large rotary kiln, such a seal device is not suitable. It is impossible to maintain the seal rings in close contact with each other at all times due to the axial expansion and contraction of the rotary kiln rotating cylinder as it is heated and cooled, and the axial reciprocation during operation. It had the disadvantage of being. Therefore, recent large-scale rotary kilns are constructed to form a complicated labyrinth between the fixed cylindrical body 5 protruding from the fixed hood and the casing 2 on the outer periphery of the rotary kiln rotating cylinder. In some cases, methods have been adopted to increase the ventilation resistance in this area and seal it, but even with this method, the seal is not perfect and it is necessary to maintain a strong reducing atmosphere, especially inside the rotary kiln. In some cases, it was not sufficient.
Furthermore, there was also the problem that furnace gas and dust leaked out from the seal, contaminating the environment.

[Problem that the invention attempts to solve]

The purpose of the present invention is to eliminate the drawbacks of the conventional rotary kiln sealing device as described above. To provide a sealing device that can maintain airtightness between a kiln cylinder and a hood even when the furnace reciprocates in the axial direction during operation.

[Means for solving problems]

In order to achieve the above object, the present invention provides an axially movable reciprocating structure between a fixed cylindrical body fixed to a fixed hood and a seal ring fixed to a rotary kiln cylindrical body. A movable cylindrical body is provided, and the sealing portion of the movable cylindrical body is constantly slid against the sealing portion of the fixed cylindrical body and the seal ring, thereby maintaining airtightness within the rotary kiln cylindrical body.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of the hood of a rotary kiln equipped with the sealing device of the present invention, and FIG. 2 is a longitudinal sectional view of the main part of FIG. 1.

The rotary cylinder 1 of the rotary kiln has a cylindrical shape, and tires 8 arranged at a plurality of locations along its length are supported by rollers 9 that are pivotally supported on the foundation, and are driven by a drive device (not shown). It is made to be rotatable around the central axis. The end of the cylinder 1 is inserted into the hood 4.

Further, a mantle 2 is fixed to the outer side near the end of the cylinder 1 with a gap 2a in between, and an annular seal ring having a seal member 3a fixed to the hood side is attached to the outside of the mantle 2. 3 is placed protrudingly. A fixed cylindrical body 5 is fixed to the hood 4 in the direction of the seal ring 3, and a packing 6 is removably attached to the inner surface of the distal end thereof. Furthermore, a movable cylindrical body 7 is provided between the seal ring 3 and the hood 4.
One end of the movable cylindrical body 7 is inserted inside the fixed cylindrical body 5, and an annular seal member 7a is provided at the other end with a seal ring 3.
It is fixed at a position where it can come into contact with the seal member 3a. Further, support members 10 are fixed to protrude from both sides of the movable cylindrical body 7 in the horizontal direction, and two wheels 11 are mounted in parallel on the support member 10 and one wheel is mounted below the support members 10.
guide rollers 12 are pivotally supported. The wheels 11 and the guide rollers 12 sandwich a rail 13 provided so as to protrude substantially horizontally from the hood 4, so that the movable cylindrical body 7 can move around the rail 13.
It is designed to be able to freely reciprocate in the direction of the central axis. Next, at the tip of the movable cylindrical body 7, arms 14 are provided protruding from upper and lower opposing positions, and a roller 15 is disposed at the tip of the arm 14 via a spindle 16. The roller 15 has a vertical shaft 15a supported so as to be able to come into contact with the opposite side of the sealing member 3a of the sealing ring 3. The arm 14 and the roller 15 are at least two
A set is required. Also, the roller 15 is connected to the spring 1
7 in the direction of the seal ring 3.

[Effect]

Since this device is constructed as described above, the movable cylindrical body 7 is drawn toward the seal ring 3, and the seal members 3a and 7a abut against each other to form a seal, and the outer surface of the movable cylindrical body 7 is sealed by the packing 6. It comes into contact with and is sealed. As a result, the cylindrical body 1 can maintain airtightness from the outside air. When the cylinder 1 rotates, the seal ring 3 also rotates, but the movable cylinder 7 does not rotate, the seal members 3a and 7a slide, and the roller 15 rolls on the surface of the seal ring 3. Furthermore, when the cylindrical body 1 moves slightly in the direction of the rotation axis, the movable cylindrical body 7 moves to the sealing member 3.
a, 7a slide against the packing 6 while abutting against each other and move in conjunction with the cylinder body 1. The pressing mechanism in this example uses the springs 17 of the plurality of arms 4 to press the movable cylindrical body 7 against the seal ring 3, but a spring (not shown) is provided in the hood 4 to seal the movable cylindrical body 7. It may be pressed in the direction of the ring 3, or a wire may be attached to the movable cylindrical body 7,
It may be pressed and biased by a weight via a pulley or the like (none of which is shown).

[Effect of idea]

As explained in detail above, according to the sealing device of the present invention, even if the rotary cylinder of the rotary kiln moves in the axial direction due to fluctuations in heat load, the inside of the rotary kiln is always kept airtight and is not affected by the outside air. Stable operations can continue without polluting the outside air.

[Brief explanation of the drawing]

Figure 1 is a side view of the rotary kiln hood section equipped with the sealing device of the present invention, and Figure 2 is a side view of the rotary kiln hood section equipped with the sealing device of the present invention.
The longitudinal sectional view of the figure, FIG. 3, is a diagram showing an example of a conventional sealing device. 1... Rotating cylindrical body, 2... Mantle, 3... Seal ring, 4... Fixed hood, 5... Fixed cylindrical body, 6
...Packing, 7...Movable cylindrical body, 8...Tire, 9...Roller, 10...Supporting member, 11...
...Wheel, 12...Guide roller, 13...Rail, 14...Arm, 15...Roller, 16...
...Spindle, 17...Spring.

Claims (1)

[Scope of utility model registration request] a fixed cylindrical body that is provided so as to protrude toward the kiln cylindrical body from a fixed hood into which an end of the rotating cylindrical body of the rotary kiln is inserted, and that has a seal portion on its inner surface; and a seal ring having a sealing surface on the fixed hood side; a seal ring whose portion near one end is inserted into the fixed cylindrical body and is reciprocally movable in the direction of its central axis; and a seal between the seal portion of the fixed cylindrical body and the seal ring. 1. A sealing device for a rotary kiln, comprising: a movable cylindrical body that can slide against a surface for sealing; and a pressing mechanism that can press and urge the movable cylindrical body in the direction of a seal ring.