JPS6328966B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a sealing device for the entrance and exit of a furnace for continuously heat-treating strips such as sheet-like thin metal plates.

(Background of the Invention) Conventionally, there has been no seal at the entrance/exit of a heat treatment furnace in a strip line that can be completely sealed both mechanically and fluidically, and the atmosphere inside the furnace and the outside air communicate through the entrance/exit. However, although the opening area of the entrance and exit is made as small as possible, this is not completely satisfactory.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a sealing device that can reliably seal the entrance and exit of a furnace without preventing the movement of the strip. .

(Structure of the Invention) In order to achieve the above object, the furnace entrance/exit sealing device according to the present invention includes several pairs of upper and lower rolls on the outside of the furnace communicating with the entrance/exit of the strip heat treatment furnace.
Nozzles are arranged in parallel at appropriate intervals in the traveling direction of the strip, and between adjacent upper rolls and lower rolls for jetting gas toward the strip, and these nozzles are communicated with a pressure accumulation chamber. It is constructed so that static pressure is generated by jetting gas from a nozzle between the rolls that clamp and convey the strip, and the outside air and the atmosphere inside the furnace are completely shut off.

(Description of Embodiments) Embodiments of the present invention will be explained with reference to the drawings.
is a strip heat treatment furnace, and strip inlets and outlets 2 and 3 are provided on the front and rear walls of the furnace.

Reference numeral 4 designates a housing having a strip passageway 5 in the center, which is closely fixed to the front and rear outer walls of the furnace 1 with the passageway 5 communicating with the strip entrances and exits 2 and 3 on the same line. Several pairs (three pairs in the figure) of upper and lower rolls 6 and 7 are arranged at appropriate intervals in the direction in which the strip 8 moves.

The upper and lower facing surfaces of the housing passage 5, which are the parts where the upper and lower rolls 6 and 7 are disposed, are curved in the shape of a concave arc groove along the circumferential surfaces of the rolls 6 and 7. The groove is deep so that it can move up and down.

Reference numerals 9 and 10 indicate upper and lower pressure accumulation chambers formed in the hollow interior of the housing 4 which is divided into upper and lower halves through the passage 5, and the passage side wall surfaces between the adjacent upper rolls 6 and 6 and between the lower rolls 7 and 7. Nozzles 11 and 12
are provided facing the passage 5, respectively, and the pressure accumulation chambers 9, 1
The atmospheric gas supplied from the outside to the nozzle 1
It is designed to eject from 1 and 12.

The above-mentioned upper and lower rolls 6 and 7 have their center shaft ends protruding from both sides of the housing 4, as shown in FIG.
It is supported by 3.13. The upper roll 6 is supported by movable bearings 14, 14 at both ends thereof, and is configured to be moved up and down by cylinders 15, 15.

(Function) To describe the function of the entrance/exit sealing device configured as described above, the strip 8 enters the furnace 1 from the passage 5 of one housing 4 through the inlet 2, is heat treated in the furnace, and then passes through the outlet 3 to the other side. is led out to the outside through the passage 5 of the casing 4.

At this time, the strip 8 moves while being held between the upper and lower rolls 6 and 7, and the upper roll 6 is pressed by the cylinder 15 and the strip 8 is pressed against the rolls 6 and 7, so that the strip 8 is moved by the rolls. Proceed by rotating 6 and 7.

Note that the lower roll 7 may be rotated at the same speed as the advancing speed of the strip 8 by an electric motor.

In the passage 5, adjacent upper rolls 6,
6 and between the lower rolls 7 and 7, static pressure is generated, and a gap between the upper and lower rolls 6 and 7 and upper and lower pressure accumulation chambers 9 and 1 in which the upper and lower rolls 6 and 7 are arranged.
Static pressure prevents outside air from entering through the gap between the zero wall plate and the roll, and leakage of the furnace atmosphere gas to the outside, thereby completely shutting off the outside air and the furnace atmosphere.

Also, when the connection part of the strip 8 passes,
The cylinder 15 is actuated by the detection signal of the connection position of the strip 8, and the upper roll 6 is pulled up via the movable bearing 14, and after the strip 8 has passed, the upper roll 6 is immediately lowered to clamp the strip 8. It is.

At this time, a large amount of atmospheric gas is ejected into the passage 5 from the nozzles 11 and 12 to increase the static pressure in the passages 5 and 5, and the outside air or the furnace atmosphere is increased according to the expansion of the gap between the upper and lower rolls 6 and 7. This prevents infiltration.

(Effects of the Invention) As described above, according to the furnace entrance/exit sealing device of the present invention, several pairs of upper and lower rolls are arranged, and the strip is held between the upper and lower rolls, and the strip is held between the adjacent upper rolls and between the lower rolls. Since the structure is such that gas is jetted from the pressure accumulation chamber through a nozzle between the strips, static pressure is generated by jetting gas between the pair of upper and lower rolls adjacent to each other in the direction of strip movement. The entrance and exit of the heat treatment furnace for the strip can be completely sealed by the pressure and the rolls to isolate the inside of the furnace from the outside air, and furthermore, even with this sealing, the strip can be smoothly moved through the rolls. Moreover, the static pressure can be easily adjusted by adjusting the amount of gas ejected from the nozzle.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a simplified longitudinal side view thereof, FIG. 2 is a simplified longitudinal front view thereof, and FIG.
FIG. 3 is a simplified side view of the entire furnace. 1...Furnace, 2, 3...Entrance/exit, 4...Casing, 5
... Passageway, 6, 7 ... Upper and lower rolls, 8 ... Strip, 9, 10 ... Pressure accumulator, 11, 12 ... Nozzle.

Claims (1)

[Scope of Claims] 1 Several pairs of upper and lower rolls are arranged in parallel at appropriate intervals in the direction of strip movement on the outside of the furnace that communicates with the entrance and exit of the strip heat treatment furnace. A sealing device for the entrance and exit of a furnace, characterized in that nozzles for jetting gas toward the strip are arranged between the strips, and these nozzles are communicated with a pressure accumulation chamber. 2. The sealing device for the entrance and exit of a furnace according to claim 1, characterized in that the upper roll is moved up and down by a cylinder.