JPH02250927A - Continuous treatment device - Google Patents

Abstract

PURPOSE:To prevent the atmosphere gases of the heating zone and cooling zone in a continuous heat treatment furnace for steel strips, etc., from being mixed with each other and to heat-treat the steel strips with high accuracy by forming gas cushions with partition walls having a specific construction between the two zones. CONSTITUTION:While a metallic material 1 to be treated, such as steel strip, is transported without contact in the continuous heat treatment furnace having the heating zone 9-1 and the cooling zone 9-2 in the direction of an arrow 8, the steel strip is continuously heat-treated. The partition walls 4, 4; having front slits 5, 5' and back slits 6, 6' are provided above and below the steel strip 1 between the heating zone 9-1 and the cooling zone 9-2 in this case. The gas cushions 7, 7 to eject the gas which is the same in the temp., humidity and components as the gas in the heating zone 9-1 from the front slits 5, 5' as well as that in the cooling zone 9-2 from the back slits 6, 6' toward the heating zone and the cooling zone, respectively, perpendicularly to or at 90 to 45 deg. angle with the steel strip 1 are provided. The gases of both the zones heat-treated the steel strip with the high accuracy without being mixed from each other form spacings 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a continuously running belt-shaped workpiece, such as a metal band or a conveying material placed on a metal belt.

The present invention relates to a continuous processing apparatus, such as a heat treatment apparatus for metal strips, which continuously processes metal strips by passing through a processing chamber.

[Prior art] Fig. 4 shows a metal strip 1-1 running continuously in the eight directions of arrows.
is continuously heat treated. FIG. 2 is a schematic diagram showing an example of a processing chamber. This processing chamber is internally partitioned by a partition wall -4-2 and is formed of, for example, a heating zone 9-1 and a cooling zone 9-2. The heating zone 9-1 is filled with high-temperature gas, and the cooling zone 9-2 is filled with low-temperature gas. The partition wall 4-2 is provided with a metal strip 1 to prevent mixing of high temperature gas and low temperature gas.
-1's driving path is narrowed. However, simply narrowing the travel path is insufficient to prevent gases from mixing, and low-temperature gas flows through the opening 3-
2 into the heating zone 9-1 as indicated by arrow 10-1, or hot gas enters the cooling zone 9-2 through the opening 3-2. Such gas passing through the opening 3-2 makes the temperature of the heating zone 9-1 and the cooling zone 9-2 uncertain, thus impairing the accuracy of the heat treatment of the metal strip 1.

Furthermore, the partition walls 4-1 and 4-3 partition the processing chamber and the outside air, but the gas inside the processing chamber and the outside air are
This impairs the accuracy of the temperature inside the processing chamber and impairs the thermal efficiency of the furnace, and the pressure inside the heat treatment furnace is usually set higher than the outside pressure. Therefore, expensive furnace gas (inert gas, reducing gas, etc.) flows out from the openings 3-1 and 3-3, and the amount must be replaced, leading to an increase in cost.

Attempts have been made to further narrow the openings by hanging curtains made of asbestos over the bulkheads 4-1, 4-2, and 4-3, but such curtains get dirty during use and can become damaged by, for example, metal strips. It is easy to cause dirt and scratches, and even with this method, it is difficult to sufficiently block gas passing through the opening.

Japanese Patent Publication Nos. 44-11451, 53-17508, and 48101 relate to methods and devices for supporting strips in stable positions using air suction. However, these prior art techniques do not provide any specific means for preventing the gases inside and outside the partition wall from migrating and mixing through the partition wall.

[Problems to be Solved by the Invention] The present invention includes a partition wall having an opening through which a strip-shaped object to be processed runs without contact, and therefore, although there is a gap between the strip-shaped object to be processed and the opening, , discloses a continuous processing apparatus in which a processing chamber is partitioned by partition walls that can prevent internal and external gases from passing through the gap and mixing.

[Means for Solving the Problems] First, the partition wall 4 of the present invention will be explained. FIG. 1 is a detailed explanatory diagram of the present invention. The strip-shaped object to be processed 1 passes through the processing chamber in the direction of arrow 8 . The processing chamber is partitioned by a partition wall 4 into zones 9-1 and 9-2, for example. The strip-shaped object to be processed 1 passes through the opening 3 without contact. A front slit 5 and a rear slit 6 that cover the width of the material 1 to be treated are provided in the opening.

The slits 5 and 6 eject gas perpendicularly to the material to be treated 1 or at an angle of 901 to 45 degrees to the material to be treated.

Zone 9-1 and zone 9-2 are generally filled with different gases at different pressures. In this specification, different gases are:
Refers to gases with different temperatures, components, humidity, etc.
The same gas refers to gases that are the same.

In FIG. 1, the slit 5 blows out the same gas as inside 9-1, and the slit 6 blows out the same gas as inside 9-2.

As will be explained in detail later, when the conditions for ejecting the gas ejected from the slits 5 and 6 are controlled, the gas ejected from the slit 5 flows exclusively in the direction of zone 9-1, and the gas ejected from the slit 6 flows exclusively in the direction of zone 9-1. Flowing exclusively in two directions,
Between the treated material 1 from the slit 5 to the slit 6,
A gas cushion 7 that does not move in the left-right direction in FIG. 1 is formed. This gas cushion allows gas to flow from zone 9-1 to zone 9-02 and from zone 9-2 to zone 9.
-1 is blocked to prevent mixing and yet to zone 9-1. It is also possible to hold zone 9-2 at an incredible pressure.

Therefore, the gas cushion seals the gap between the opening 3 and the object 1 to be processed, thereby preventing the atmospheres inside and outside the partition wall 4 from mixing.

In FIG. 1, the slits 5' and 6' provided below the openings also eject gas, forming a gas cushion 7' between the lower surface of the object 1 and the partition wall 4. The gas cushion 7' similarly seals the opening on the lower surface of the strip-shaped object 1 to be processed.

In the present invention, for example, the gas ejected from the slits 5 and 5' flows toward the zone 9-1, but the gas ejected from the slit 5.5' is the same gas as the gas in the zone 9-1. 1 is always kept at the same gas level.

Similarly, the same gas is always maintained in zone 9-2.

FIG. 2 is an explanatory diagram of an example of a processing chamber of the continuous processing apparatus of the present invention. The strip-shaped object to be processed 1 travels in the direction of arrow 8 . Partition wall 4-1 is a partition between outside air and zone 9-1, 4-2 is a partition between zone 9-1 and zone 9-2, and 4-3 is a partition between zone 9-2 and outside air. Each bulkhead has a front slit (5-1, 5-2, 5-3) and a rear slit (6
-1°6-2.6-3) are provided respectively.

In the partition wall 4-1 of FIG. 2, the slit 5-1 blows out the same air as outside air, and the slit 6-1 blows out the same gas as in the zone 9-1. Gas cushion two 1 is formed by this ejection, and blocks off outside air and zone 9-1. In the partition wall 4-2 of FIG. 2, the slit 5-2 blows out the same gas as in the zone 9-1, and the slit 6-2 blows out the same gas as in the zone 9-2. Each of the ejected gases flows in the direction of the arrow, but since the gas cushion 7-2 is formed, no gas flows between zone 9-1 and zone 9-2, and no gas flows between zone 9-1 and zone 9-2. 1 and zone 9-2 are cut off. The partition wall 4-3 similarly blocks off the zone 9-2 from the outside air. In the example shown in Fig. 2, the slit 5-3 blows out the same gas as the slit 9-2, and the slit 6-3 blows out the same air as the outside air. Gas cushion pads'-1, 7' are also provided on the bottom surface of the treated material 1.
-2,7'-3 is formed to block gas flowing through the partition wall.

Based on FIG. 2, an example of a processing chamber having three partition walls has been described in detail. If the partition wall of the present invention is used even in a processing chamber with a partition wall on the side or a processing chamber with a large number of partition walls inside the processing chamber and a large number of zones, the gas moving through the partition wall can be used. The flow can be blocked.

FIG. 3 is a diagram showing another example of application of the present invention. In FIG. 3, the objects 11 to be processed are small in shape and are not strip-shaped, for example, brick-shaped objects, but when placed on the conveyor belt 10, they become strip-shaped objects. As will be explained in detail later, in order to form a stable gas cushion 7, it is preferable that the distance between the material to be treated 11 and the slits 5 and 6 does not change. Therefore, the material to be treated 11 in FIG. It is preferable to place the paper on the conveyor belt 10 so that the paper is evenly distributed.

[Function] The reason why the gap between the object to be processed 1 and the opening 3 is sealed by the gas cushion 7 in the present invention will be explained.

In Figure 1, gas pressure P7 in the gas cushion and zone 9-
The relationship between the gas pressure P and -□ in the vicinity of the opening of the partition wall 4 in 1 is expressed by the following equation 1.

P. slit width, h: distance between the opening of the partition wall and the object to be processed; similarly, gas pressure P7 in the gas cushion and zone 9-2
The relationship between the gas pressure P and -8 near the opening of the partition wall 4 is expressed by the following second equation.

Pv=Ps-i+aspsu:(ts/h)"-
-(2) However, awtbs is a constant, pH=density of gas ejected from slit 6, u, flow rate of gas ejected from slit 6, t6: slit width of slit 6, pressure p,
and P, -2 are often predetermined depending on operating conditions, and usually P, -1≠P, -8. If the right-hand side of the first equation and the right-hand side of the second equation are made equal here, hydrodynamic equilibrium is achieved and the gas cushion 7 that does not move is formed.

That is, if the gas ejected from the slit 5 and the gas ejected from the slit 6 are controlled as shown in the third equation below, hydrodynamic balance is achieved.

Ps-t+ aspsu: (ts/h)” In the third equation,
The constants 85 and b5 and the constants 86 and b@ are known in advance through experiments, etc. 1 In the present invention, these constants are used to calculate us+tst u@* t so that the third equation is satisfied.
@9 h etc. to achieve hydrodynamic balance. When this balance is achieved and the gas cushion 7 is not moved, the ejected gas from the slit 5 flows exclusively into the zone 9-1, as already mentioned.

Moreover, the ejected gas from the slit 6 flows exclusively into the zone 9-2, thereby preventing the gas in the zones 9-1 and 9-2 from passing through the partition wall 4 and moving to the adjacent zone.

[Example] Using the continuous annealing furnace of the present invention shown in FIG. 2, a continuously running strip steel plate was passed through. The size of the strip steel plate is width 1 * 000rmm e thickness 0.1mm ~ 0.6VA, threading speed 10m/min, ~ 50m/min.
It was a win. In FIG. 2, the distance between the opening of the partition wall and the strip steel plate is 20+*m. In the figure, the atmospheric gases in zone 9-1 and zone 9-2 are both reducing gases, but there is a difference in dew point and gas temperature.

In the figure, air is released from slits 5-1 and 6-3.

The same gas as the reducing gas in zone 9-1 is ejected from slit 6-1.5-2, and the same gas as the reducing gas in zone 9-2 is ejected from slit 6-2.5-3. I can do it.

The furnace pressure in zone 9-1 and zone 9-2 is 25m+mH
It was 2O. Therefore, in order to seal zone 9-1 and zone 9-2 and the outside of the annealing furnace, the cushion portion 7
-1.7-2.7-3.7'-1,7'-2 and 7'
The flow rate (uGvu@) of the air and reducing gas to be ejected from the slit is adjusted according to the above-mentioned method so that the pressure in zone 9-3 is 35 mmH,0, which is 10+ueH,0 higher than the furnace pressure in zone 9-1 and zone 9-2. As a result of calculation from Equation 3, the appropriate flow velocity was 5 m/see to 15 m/see, and the ejected gas flow velocity was controlled to be within this range. As a result, hydrodynamic equilibrium is achieved and zones 9-1 and 9
-2 gas could be prevented from passing through the partition wall and mixing with each gas, and the annealing furnace could be sealed from the outside.

Next, a continuous annealing furnace of the present invention shown in FIG. 3 was used to pass a continuously running strip steel plate placed in a belt shape on a conveyor belt.

The size of the strip steel plate, the threading speed, the distance between the opening of the partition wall and the strip steel plate, and the atmospheric gas were all the same as in the case explained using FIG. 2 as an example.

The furnace pressure in zone 9-1 and zone 9-2 is 25 mH2
It was O. Therefore, in order to seal zone 9-1 and zone 9-2 and the outside of the annealing furnace, the pressure of the cushion portion 7 must be 10 m higher than the furnace internal pressure of zone 9-1 and zone 9-2.
m1. The flow rate (us
+us) was calculated from the third equation described above, and the appropriate flow velocity was 5 m/see to 15 m/see, and the ejected gas flow velocity was controlled to stay within that range. As a result, hydrodynamic equilibrium is achieved, gases in zones 9-1 and 9-2 can be prevented from passing through the partition wall and mixing with their respective gases, and the annealing furnace can be sealed from the outside. did it.

[Effects of the Invention] When the continuous processing apparatus of the present invention is used, the objects to be processed travel without contacting the openings of the partition walls, so that dirt and scratches due to contact with the openings occur on the objects to be processed. Furthermore, the workpiece can be moved at high speed.

In the present invention, the opening of the partition wall is sufficiently sealed, and the gases inside and outside the partition wall do not mix with each other.
The inside of each zone is always kept in a uniform atmosphere with desired conditions.

Therefore, when the continuous processing apparatus of the present invention is used, it is possible to process objects to be processed with high precision, and when used as a heat treatment furnace for metal strips, for example, heat treatment with high precision of thermal history becomes possible.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an example of a partition wall in a continuous processing apparatus of the present invention, FIG. 2 is an explanatory diagram of an example of a processing chamber in a continuous processing apparatus of the present invention, and FIG. Diagram showing an example. FIG. 4 is an explanatory diagram of an example of a conventional method for continuously processing a metal strip. 1 (1-1): Processed object, 2: Continuous processing chamber, 3 (
3-1゜3-2.3-3): Opening, 4 (4-1,
4-2, 4-3): Partition wall. 5 (5-1, 5-2, 5-3,), 5'(5'-1,
5'-2,5'-3): Front slit, 6 (6-1
, 6-2, 6-3), 6'(6'-1,6'-2, 6
'-3): Back slit, ? (7-1, 7-2, 7-
3),? '(7'-1,7'-2,7'-3): Gas cushion, 8: Arrow, 9-1: Heating zone,
9-2 = cooling zone, lO: conveyor belt, h: interval. Patent applicant Nippon Steel Corporation

Claims (3)

[Claims] (1) In a continuous processing device that continuously processes a continuously traveling strip-shaped workpiece 1 by passing it through a processing chamber 2,
The processing chamber 2 is partitioned by a partition wall 4 having an opening 3 through which the object 1 to be processed passes through without contact.
A front slit 5 (5') blows jet gas onto the running surface of the
) and a rear slit 6 (6'), and a front slit 5 (
5') and the rear slit 6 (6') are gas cushions 7 (7') that jet gas and do not move between them and the object to be processed 1.
, and the gas cushion 7 (7') seals the gap between the opening 3 and the object to be processed 1 to prevent mixing of atmospheres inside and outside the partition wall 4. (2) The strip-shaped workpiece 1 that runs continuously is a metal strip,
Claim (1) characterized in that the processing chamber 2 is a processing chamber consisting of a plurality of zones whose interior is partitioned by one or more partition walls 4.
1) The continuous processing device according to item 1). (3) The continuous processing apparatus according to claim 1, wherein the strip-shaped workpiece 1 that continuously runs is a workpiece placed in a belt-like manner on the conveyor belt 10.