JPH08246065A - Sealing device in continuous heat treatment furnace for metallic strip - Google Patents

Abstract

PURPOSE: To improve sealing and to smoothly introduce a metallic strip by loading a roll pair rotated in the different direction from a furnace frame, interposing an elastic material between the furnace frame and the end surface of the roll, and further, interposing a skid between the furnace frame and the elastic material. CONSTITUTION: The elastic roll pair 11, 12 holding the metallic strip A are loaded to the furnace frame 21. The elastic roll 11 is rotated in right direction and the elastic roll 12 is rotated in left direction. The elastic rolls 11, 12 use iron-made rolls 11a, 12a as the core material and urethane rubber 11b, 12b, etc., is lined on the surfaces. Felts 41, 42, etc., are fitted on the outer surfaces of the seal metals 31, 32 fitted to the furnace frame 21 and the elastic rolls 11, 12 are pushed to the felts 41, 42. The elastic material such as a sponge 51, etc., is interposed between the furnace frame 21 and the end surface in the axial direction of the elastic roll, and further, the skid 61 is interposed between the sponge 51 and the end surface in the axial direction of the elastic roll 11. The sponge 51 is fixed to the furnace frame 21 and the skid 61 is fixed to the sponge 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for a continuous heat treatment furnace for metal strips. All are strip-shaped stainless steel plates, aluminum plates, copper plates, various alloy plates, etc.
Vertical or horizontal continuous heat treatment furnaces are used for heat treating these metal strips, for example annealing, solutionizing, brightening. In these continuous heat treatment furnaces, generally, a sealing device is provided at the entrance and exit of the strip for heat treating the metal strip under a predetermined atmosphere gas, for example, under a hydrogen gas-containing atmosphere gas. The present invention relates to an improvement of such a sealing device.

[0002]

2. Description of the Related Art Conventionally, as a sealing device as described above,
A pair of rolls mounted on a furnace frame and rotating in different directions, a seal metal member attached to the furnace frame, and a felt member attached to the outer surface of the seal metal member are used (Japanese Patent Publication No. 6-4).
3616). This prior art device guides a metal strip between a pair of rolls while pressing the rolls against the felt to seal. However, this conventional device has the drawbacks that the sealing property is poor and the metal strip cannot be smoothly guided in some cases.

The pair of rolls, which guide the metal strip while sandwiching it from both sides, are exposed directly to the atmosphere in the furnace, and therefore repeat thermal expansion and thermal contraction. When the roll is mounted with the axial end surface of the roll closely attached to the furnace frame, the roll bends due to its thermal expansion, the metal strip cannot be smoothly guided by such roll, and the pressing against the felt is partially unsuccessful. Atmosphere gas in the furnace leaks out from there.
On the contrary, when the roll is mounted with a gap left between the furnace frame and the axial end surface of the roll in consideration of the maximum thermal expansion of the roll, or a spacer is placed between the furnace frame and the axial end surface of the roll. When the roll is mounted, if the roll is mounted with a gap left between the furnace frame and the spacer or between the spacer and the axial end face of the roll, bending of the roll due to thermal expansion can be prevented. Atmosphere gas in the furnace leaks through the gaps during operation other than the maximum expansion time.

[0004]

The problem to be solved by the present invention is that the conventional sealing device has a poor sealing property.
In addition, the metal strip may not be smoothly guided in some cases.

[0005]

SUMMARY OF THE INVENTION The present invention is, however, a sealing device equipped at the entrance and exit of a continuous heat treatment furnace for metal strips, in which a pair of rolls rotating in different directions is mounted on a furnace frame, An elastic material is interposed between the furnace frame and the axial end surface of the roll, and a lubricant is further provided between the furnace frame and the elastic material and / or between the elastic material and the roll. The present invention relates to a sealing device in a continuous heat treatment furnace for metal strips, which is characterized by being interposed.

The sealing device of the present invention comprises a pair of rolls mounted on a furnace frame and rotating in different directions, an elastic material interposed between the furnace frame and an axial end surface of the roll, and the furnace. A lubricant is provided between the frame and the elastic material and / or between the elastic material and the roll. Two rolls are arranged side by side, each mounted on a furnace frame and connected to a synchronized drive motor. As the roll, a metal roll can be used, but a metal roll is used as a core material, and the core material is made of nitrile rubber, chloroprene rubber, fluororubber,
It is preferable to use an elastic roll lined with rubber such as silicone rubber or urethane rubber.

The elastic material is interposed between the furnace frame and the axial end surface of the roll, and is formed in a tubular shape as a whole. As the elastic material, the material is not particularly limited as long as it has appropriate durability and can absorb the thermal expansion of the roll, but it is preferable to use sponge, and among them, urethane foam having a closed cell structure is used. It is preferably used.

The lubricating material is interposed between the furnace frame and the elastic material and / or between the elastic material and the axial end surface of the roll, and is formed in a ring shape as a whole. The elastic material and the lubricant may or may not be fixed. However, when the elastic material is fixed to the furnace frame, the lubricant is placed between the elastic material and the axial end surface of the roll. Intervene. When the elastic material is fixed to the end surface of the roll in the axial direction, the lubricant is interposed between the furnace frame and the elastic material. Further, when the elastic member is not fixed, the lubricant is interposed between the furnace frame and the elastic member and between the elastic member and the axial end face of the roll. The lubricant is not particularly limited as long as it has a smooth surface and low friction, but a Teflon plate is preferable.

[0009]

Since the thermal expansion of the roll is absorbed by the elastic material interposed between the furnace frame and the axial end face of the roll, the roll can be prevented from bending and the metal strip can be smoothly guided. In the radial direction of the roll, as in the conventional case, a sealing metal object is attached to the furnace frame, a felt is attached to the sealing metal object, and the roll is pressed against the felt for sealing, but since the roll does not bend, the roll is In the case of the present invention, not only the roll but also the elastic material and the slipping material can be pressed uniformly against the felt, and therefore a reliable seal can be achieved. Further, in the axial direction of the roll, the furnace frame, the elastic member and the axial end face of the roll are always in close contact with each other via the lubricant, so that the roll can be reliably sealed.

[0010]

FIG. 1 is a longitudinal sectional view in the furnace length direction showing an embodiment of the present invention. FIG. 1 shows a sealing device at the entrance of the horizontal continuous heat treatment furnace. A pair of elastic rolls 11 and 12 are provided so as to sandwich the metal strip A from both upper and lower sides. The elastic rolls 11 and 12 are connected to a tuned drive motor (not shown) so that the elastic roll 11 rotates right and the elastic roll 12 rotates left. The elastic rolls 11 and 12 are iron rolls 11a and 12a.
Is used as a core material, and cylindrical urethane rubber 11b, 1 is provided on the surface thereof.
It consists of a lined 2b. Furnace frame 21
Seal metal pieces 31 and 32 are attached to the outer surface of the seal metal pieces 31 and 32, and felts 41 and 42 are attached to the outer surfaces of the seal metal pieces 31 and 32.
It is pressed against 42.

FIG. 2 is a partially enlarged side view showing the same embodiment as FIG. The elastic roll 11 is mounted on the furnace frame 21. A cylindrical sponge 51 as an elastic material is interposed between the furnace frame 21 and the axial end surface of the elastic roll 11, and a ring-shaped sliding material is further provided between the sponge 51 and the axial end surface of the elastic roll 11. The Teflon plate 61 of FIG. The sponge 51 is fixed to the furnace frame 21,
The Teflon plate 61 is fixed to the sponge 51.
Although illustration and description are omitted, the elastic roll 12 forming a pair with the elastic roll 11 has the same structure.

FIG. 3 is a partially enlarged side view showing another embodiment of the present invention as in the case of FIG. Furnace frame 22
An elastic roll 13 is mounted on the core, and the elastic roll 13 is composed of an iron roll 13a as a core material and a cylindrical urethane rubber 13b lined on the surface thereof.
A tubular sponge 53 as an elastic material is interposed between the furnace frame 22 and the axial end surface of the elastic roll 13, and a ring-shaped Teflon plate 63 is used as a lubricant between the furnace frame 22 and the sponge 53. Is installed. The sponge 53 is fixed to the axial end surface of the elastic roll 13, and the Teflon plate 63 is fixed to the sponge 53. Although illustration and description are omitted, other elastic rolls that form a pair with the elastic roll 13 have the same configuration.

FIG. 4 is a partially enlarged side view showing still another embodiment of the present invention as in the case of FIG. The elastic roll 15 is mounted on the furnace frame 23.
Reference numeral 5 is composed of an iron roll 15a as a core material and a cylindrical urethane rubber 15b lined on the surface thereof. A cylindrical sponge 55 as an elastic material is interposed between the furnace frame 23 and the axial end surface of the elastic roll 15, and further between the furnace frame 23 and the sponge 55 and between the sponge 55 and the elastic roll 15 in the axial direction. Ring-shaped Teflon plates 65 and 66 are interposed as lubricants between the end faces. Sponge 55
Also, the Teflon plates 65 and 66 are not fixed. Although illustration and description are omitted, other elastic rolls forming a pair with the elastic roll 15 have the same configuration.

Each of the examples shown in FIGS. 1 to 4 is a sealing device at the inlet of the horizontal continuous heat treatment furnace, but similar sealing devices are also provided at the outlet of the horizontal continuous heat treatment furnace and the inlet and outlet of the vertical continuous heat treatment furnace. Applicable.

[0015]

As is apparent from the above, the present invention described above has the advantages that the sealing property is good and the metal strip can be guided smoothly at all times.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view in a furnace length direction showing an embodiment of the present invention.

FIG. 2 is a side view showing the same embodiment as FIG. 1 in a partially enlarged manner.

FIG. 3 is a side view showing a partially enlarged view of another embodiment of the present invention.

FIG. 4 is a side view showing, in a partially enlarged manner, still another embodiment of the present invention.

[Explanation of symbols]

11, 12, 13, 15, ... Elastic rolls 21, 21,
2, 23 ... Furnace frame, 31, 32 ... Seal hardware, 4
1, 42 ... Felt, 51, 53, 55 ... Sponge, 61, 63, 65, 66 ... Teflon plate

Claims (4)

[Claims] 1. A sealing device installed at an inlet / outlet of a continuous heat treatment furnace for metal strips, wherein a pair of rolls rotating in different directions is mounted on a furnace frame, and the furnace frame and an axial end surface of the roll. And an elastic material interposed between the furnace frame and the elastic material, and / or a lubricant between the elastic material and the roll. Sealing device for continuous heat treatment furnace for metal strip. 2. The sealing device in a continuous heat treatment furnace for metal strips according to claim 1, wherein the roll is an elastic roll having rubber running on a core material. 3. The elastic material is sponge as claimed in claim 1.
A sealing device in the continuous heat treatment furnace for metal strips according to claim 1. 4. The sealing device in a continuous heat treatment furnace for metal strips according to claim 1, 2 or 3, wherein the lubricant is a Teflon plate.