JPH11343522A - Roll seal device of continuous heat treatment furnace for metal strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roll seal device of a continuous heat treatment furnace for a metallic strip which is capable of pressing an elastic diaphragm of a chamber against a surface of a rotary roll opposite thereto in a constantly stable manner as desired, and free from the increase in the gas leakage with a simple structure. SOLUTION: A roll seal device is equipped with a pair of rotary rolls 11, 12 holding a surface of a metallic strip A from both sides over its width direction, and a pair of chambers 31, 32 in which elastic diaphragms 21, 22 are stretched in the axial direction of each rotary roll opposite to its surface, and a non-combustible liquid or a non-combustible and flowable powder and granular material is supplied in each chamber to control the pressure to be applied to the elastic diaphragm of each chamber, and each elastic diaphragm is pressed against the surface of the rotary roll opposite thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll sealing device for a continuous heat treatment furnace for metal strip. A vertical or horizontal continuous heat treatment furnace is used when a metal strip such as a strip-shaped stainless steel plate or a copper plate is subjected to continuous brightening treatment or continuous non-oxidizing annealing. In such a continuous heat treatment furnace, in order to heat-treat the metal strip in a state where the furnace is filled with a twistable gas, a roll seal device is installed at the entrance and exit of the furnace to minimize the leakage of the combustible gas in the furnace to the outside of the furnace. Installing. The present invention relates to an improvement of such a roll seal device.

[0002]

2. Description of the Related Art Conventionally, as a roll seal device as described above, a pair of rotating rolls sandwiching the surface from both sides in the width direction of a metal strip, and an elasticity relative to the surface in the axial direction of each rotating roll. Japanese Patent Application Laid-Open No. H10-46 proposes a configuration in which a pair of chambers having a diaphragm are provided, and a gas such as nitrogen gas is pumped into each chamber.
261). This conventional apparatus seals between the metal strip and each of the rotating rolls by sandwiching both sides of the metal strip between a pair of rotating rolls, and also pressurizes gas into each of the chambers attached to the furnace frame, whereby the pressure is reduced. Is pressed against the rotating rolls facing each other to seal the gap between each elastic diaphragm and each rotating roll facing each other.

[0003] However, the conventional apparatus as described above has a problem in that the pressure applied to each of the elastic diaphragms fluctuates because the gas is pumped into the chamber. If the pressure applied to the elastic diaphragm is too small due to the pressure fluctuation, the pressure contact of the elastic diaphragm with the rotating roll becomes insufficient, and the leakage of the twistable gas in the furnace from both sides to the outside of the furnace. To increase. Further, when the gas supply is stopped due to a power failure or the like, the amount of the flammable gas leaked further increases. In order to eliminate these inconveniences, if the pressure fluctuation is reduced in the conventional apparatus as described above, the structure of the apparatus for controlling the pressure in the gas pumping system becomes complicated.

[0004]

The problem to be solved by the present invention is that a conventional roll seal device in which a gas such as nitrogen gas is pressure-fed into each chamber has a pressure applied to an elastic diaphragm of each chamber. The fluctuation of the flammable gas in the furnace increases the amount of leakage, or the amount of flammable gas leakage further increases when the gas supply is stopped. If this is attempted, the structure of the apparatus for controlling the pressure in the gas pumping system becomes complicated.

[0005]

SUMMARY OF THE INVENTION The present invention, which solves the above-mentioned problems, is a roll sealing apparatus for sealing the entrance and exit of a continuous heat treatment furnace for metal strips, the surface being sandwiched from both sides in the width direction of the metal strip. A pair of rotating rolls, and a pair of chambers each having an elastic diaphragm stretched in the axial direction of each rotating roll so as to face the surface thereof, wherein a flame-retardant liquid or a flame-retardant and flowable powder is provided in each chamber. To control the pressure applied to the elastic diaphragms of the respective chambers so that the respective elastic diaphragms are brought into pressure contact with the surface of the rotating roll opposed thereto.

The roll sealing device of the present invention is for sealing the inlet and outlet of a continuous heat treatment furnace for metal strip. This roll sealing device includes a pair of rotating rolls that sandwich the surface of the metal strip from both sides in the width direction. Such a rotating roll is usually made by lining an elastic body made of rubber, for example, on the outer circumference of a metal roll, and can be tuned so that the peripheral speed is the same as the transport speed of the metal strip. The gap between the two rotating rolls can be adjusted by tilting with a pressure cylinder. The gap between the two rotating rolls is adjusted according to the thickness of the metal strip, and each rotating roll is tuned to rotate so that the peripheral speed is the same as the transport speed of the metal strip. To seal between the metal strip and each rotating roll.

[0007] The roll seal device of the present invention is provided with a pair of chambers each having an elastic diaphragm stretched in the axial direction of each rotating roll so as to face the surface thereof. Each chamber is usually attached at its base to a flange formed at the inlet or outlet of the furnace, and an elastic diaphragm is stretched at the open end of the chamber, facing the surface of the rotating roll. .
Examples of the elastic diaphragm include an elastic plate made of a liquid-impermeable styrene-butadiene rubber, a cushion material made of a soft urethane foam laminated on the surface thereof, and a low friction and abrasion resistance laminated on the surface. And a three-layer laminate consisting of the following woven fabrics.

In each of the above-mentioned chambers, a predetermined amount of a flame-retardant liquid or a flame-retardant and flowable powder can be supplied. Water, silicone oil and the like can be used as the flame-retardant liquid, and sand, ceramic powder, ceramic particles and the like can be used as the flame-retardant and fluid powder. For example, a supply pipe is connected to the side wall of each chamber, a measuring instrument is connected to the supply pipe, and a certain amount of water is allowed to flow under its own weight from the measuring instrument through the supply pipe into the chamber. A constant pressure is applied according to the amount of water that has flowed down by its own weight to the elastic diaphragm stretched over the elastic diaphragm, and the elastic diaphragm to which the constant pressure has been applied is pressed against the surface of the rotating roll opposed thereto, so that the furnace inlet is Alternatively, a seal is provided between the elastic diaphragm of the chamber attached to the outlet and the rotating roll.

According to the present invention, a predetermined amount of a flame-retardant liquid or a flame-retardant and flowable powder is supplied into a chamber, and a predetermined pressure is applied to an elastic diaphragm of the chamber in accordance with the supply amount. With little variation, the elastic diaphragm can be constantly and stably pressed against the surface of the rotating roll facing the elastic diaphragm as desired. Further, in the present invention, in the simplest case, the predetermined amount of the flame-retardant liquid or the flame-retardant and fluid powder is simply allowed to flow down by its own weight, so that the structure of the supply system is also simple.

[0010]

FIG. 1 is a longitudinal sectional view illustrating a roll seal device according to the present invention. FIG. 1 shows a roll seal device installed at the inlet of a vertical continuous heat treatment furnace for metal strips. A pair of rotating rolls 11, 12 sandwiching the surface of the metal strip A continuously conveyed from both sides in the width direction is provided. The rotating rolls 11 and 12 include metal rolls 11b and 12b attached to rotating shafts 11a and 12a, and metal rolls 11b and 12b.
cylindrical rubber 11c, 12c lined on the surface of b
Although not shown, the peripheral speed can be tuned and rotated so as to be the same as the transport speed of the metal strip A, and it is tilted by a pneumatic cylinder to provide a clearance between the two. Can be adjusted according to the thickness of the metal strip A. As these tuning rotating means and tilt adjusting means themselves, means in a conventional roll seal device can be applied.

A pair of chambers 31 and 32 having elastic diaphragms 21 and 22 stretched in the axial direction of each of the rotating rolls 11 and 12 facing the surface thereof are provided. Chamber 31,
32 has a base 23 bolted to a flange 41 formed at the inlet of the furnace, and elastic diaphragms 21, 22 are stretched at the open end thereof facing the surfaces of the rotating rolls 11, 12. . The illustrated elastic diaphragms 21 and 22 are elastic plates 21 a and 2 made of a liquid-impermeable styrene-butadiene rubber.
2a, a soft urethane foam cushioning material 21b, 22b laminated on its surface, and a low-friction and wear-resistant woven fabric 21c, 22c laminated on its surface. , Are detachably bolted to the distal ends of the chambers 31 and 32.

Supply pipes 31a and 32a are connected to upper portions of the side walls of the chambers 31 and 32, respectively.
A measuring device (not shown) is connected to a. FIG. 1 shows a chamber 31, a supply pipe 31a and a supply pipe 31a.
32 shows a state in which a certain amount of water B, C is caused to flow down by its own weight into the inside of the chamber 32. Therefore, the chamber 31 of the certain amount of water B, C is placed on the elastic diaphragms 21, 22 stretched at the open ends of the chambers 31, 32. , 32 are applied, and the elastic diaphragms 21 and 22 to which the pressure is applied are in pressure contact with the surfaces of the rotating rolls 11 and 12 opposed thereto.

Ground rolls 51, 52 for discharging static electricity generated when the rotating rolls 11, 12 rub against the surfaces of the elastic diaphragms 21, 22 are provided on the rotating rolls 11, 12, respectively.
Is in pressure contact. A load corresponding to the weights 51b, 52b is applied to the earth rolls 51, 52 via the connecting rods 51a, 52a supported by the shafts. It comes into pressure contact with the surface and is driven by the rotating rolls 11 and 12. These earth rolls themselves can apply the earth roll in the conventional roll sealing device.

[0014]

As is apparent from the above description, the present invention described above allows the elastic diaphragm of the chamber to be stably and constantly pressed against the surface of the rotating roll opposed thereto with a simple structure. Therefore, there is an effect that the amount of gas leakage does not increase.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view illustrating a roll seal device according to the present invention.

[Explanation of symbols]

11, 12 ... rotating rolls 21, 22, ... elastic diaphragm, 31, 32 ... chamber, 51, 52 ... ground roll, A ... metal strip, B, C ... water

Claims (1)

[Claims] 1. A roll sealing device for sealing an entrance and an exit of a continuous heat treatment furnace for metal strip, comprising: a pair of rotating rolls sandwiching a surface of the metal strip from both sides in a width direction, and an axial direction of each rotating roll. A pair of chambers having an elastic diaphragm stretched opposite to the surface thereof, and supplying a flame-retardant liquid or a flame-retardant and fluid powder into each chamber to reduce the pressure applied to the elastic diaphragm in each chamber. A roll seal device characterized in that by controlling, each elastic diaphragm is brought into pressure contact with the surface of a rotating roll facing the elastic diaphragm.