JPS6321569Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a coil annealing furnace for annealing cold-rolled steel sheets, and in particular, the invention relates to a coil annealing furnace for annealing a cold-rolled steel plate, and particularly for cooling a coil annealing furnace for cooling a rolled coil after being heated in the coil annealing furnace. It is related to the device.

[Prior Art] A coil annealing furnace heats a cold-rolled rolled coil in an inert gas atmosphere and then cools and anneals it. This will be explained with reference to FIG. 3.

A base refractory 2 is provided on a base 1, and a plenum chamber 4 is provided on the base refractory 2 via a differential user chamber 3. A rolled coil 5 cold-rolled on this plenum chamber 4
is placed. An inner cover 6 is provided on the base refractory 2 to surround the rolled coil 5 to isolate it from the outside air. Base 1 and base refractory 2
A circulation fan 7 is provided in the center of the inner cover 6 so that the atmospheric gas such as inert gas inside the inner cover 6 is circulated as shown by the arrow in the figure. It passes through the user chamber 3, passes between the inner cover 6 and the rolling coil 5, rises, turns downward above it, passes between the plates of the rolling coil 5, flows into the plenum chamber 4, and returns to the circulation fan 7. It is cycled again as described above.

Atmospheric gas is supplied into the inner cover 6 from an atmospheric gas supply port 8 provided through the base 1 and the base refractory 2, and is appropriately exhausted from an atmospheric gas exhaust port 9. A liquid sealing device 12 made of oil 10 and water 11 provides a seal between the inner cover 6, the base 1, and the base refractory 2.

A heating cover (not shown) and a cooling cover 13 are alternately and removably provided on the outer periphery of the inner cover 6 to surround the inner cover 6.

In annealing the rolled coil 5, a heating cover is placed over the inner cover 6, the inner cover 6 is heated by the combustion gas inside the heating cover, and the heat is circulated within the inner cover 6 as shown by the arrow. The rolling coil 5 is heated by receiving heat from the gas.

After heating the rolling coil 5 for a predetermined period of time, the heating cover is removed and a cooling cover 13 shown in the figure is placed on it. In cooling with this cooling cover 13, by rotating a cooling fan 14 provided at the center of the upper part of the cooling cover 13, outside air is sucked through the lower end opening 15 of the cooling cover 13, and the outside air is used to cover the inner cover 1. When the temperature of the rolling coil 5 has cooled down to a certain level (for example, 350°C), cooling water is supplied to the inner cover 6 from a water sprinkling pipe 16 provided at the top of the inner cover 6. At the same time as sprinkling water, the rotation of the cooling fan 14 is reversed so that outside air flows from the cooling fan 14 to the opening 15 at the lower end, cooling the inner cover 6 with water and exhausting the generated steam from the opening 15. The rolling coil 5 is cooled.

[Problems to be solved by the invention] However, as shown in FIGS. 4 and 5, the cooling water from the water spray pipe 16 is passed through nozzles provided at intervals in the circumferential direction at the bottom of the water spray pipe 16. Since water is sprayed from the holes 17 onto the top of the inner cover 6, it bounces off as shown by the arrows in FIG. 4, and since there is a gap between the nozzle holes 17 as shown in FIG. The flow does not flow along the surface of the inner cover 6, and instead flows down while being biased on the surface of the inner cover 6. As a result, temperature unevenness occurs on the surface of the inner cover 6, resulting in an uneven temperature distribution in the atmospheric gas circulating inside the inner cover 6. There is a problem in that variations occur, and as a result, the quality of the rolled coil 5 becomes uneven.

[Purpose of the invention] The present invention was made in consideration of the above circumstances, and provides a coil annealing furnace that can uniformly form a water film over the entire surface of the inner cover when the inner cover is water-cooled after being heated and air-cooled. The purpose is to provide a cooling device for.

[Summary of the invention] In order to achieve the above object, the present invention includes an inner cover for enclosing a rolled coil to isolate it from outside air and annealing the rolled coil, and an inner cover for surrounding the inner cover. In a cooling device for a coil annealing furnace equipped with a cooling cover for air cooling and water cooling the outer periphery, an annular water sprinkling pipe is provided at the upper center of the inner cover, and cooling water is distributed in the circumferential direction at the bottom of the water sprinkling pipe. A slit is formed on the top of the inner cover to spray water in a film shape, and a water reservoir plate is provided on the upper outer periphery of the inner cover to allow the cooling water to flow down in a water film shape on the outer periphery of the inner cover. A slit is formed along the circumference at the bottom of the water sprinkler pipe, and cooling water is sprayed from the slit onto the top of the inner cover in the form of a water film, allowing the cooling water to flow uniformly over the entire top. Moreover, since the cooling water is received by the water reservoir cutting plate at the upper part of the outer periphery of the inner cover, the cooling water can flow down in the form of a water film over the entire outer periphery of the inner cover. This makes it possible to uniformly cool the coil without causing uneven cooling, thereby improving its quality.

[Embodiment] A preferred embodiment of the cooling device for a coil annealing furnace according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the main parts of the cooling device for the coil annealing furnace of the present invention. Although the lower part of the inner cover 6 is omitted in the figure, it is the same as the conventional example shown in FIG. Atmospheric gas such as an inert gas is forcibly circulated by a circulation fan 7 in order to heat or cool the rolled coils 5 placed thereon (two stacked in the illustrated example).

Cooling cover 13 surrounding inner cover 6
is provided to be removable from the inner cover 6 and can be raised and lowered by, for example, a crane (not shown).Although not shown in the drawings, it is provided with a guide rod or the like so that it can be accurately positioned with respect to the inner cover 6 during installation. You will be guided up and down. In addition, an appropriate number of legs 1 are provided on the lower outer periphery of the cooling cover 13.
8, and an opening 15 of an appropriate size is formed in the lower part of the cooling cover 13 when its legs 18 touch the floor surface.

As explained in FIG. 3, the cooling fan 14 is provided in the intake/exhaust pipe 19 at the center of the upper part of the cooling cover 13, and when the cooling fan 14 rotates forward, the air flows toward the intake/exhaust pipe 19 from the opening 15. When the rotation is reversed, outside air flows from the intake and exhaust pipe 19 to the opening 15.

An annular water spray pipe 16 is provided at the center of the upper part of the inner cover 6. This water sprinkler pipe 16 can be attached to the cooling cover 13 side, or it can be attached to the inner cover 6.
It may be attached to the top of the Further, in the illustrated example, one water spray pipe 16 is provided, but two or more water pipes may be provided concentrically as shown in FIG. 3.
As shown in FIG. 2, a continuous slit 20 is formed in the lower part of the water spray pipe 16 along its circumferential direction.

Further, on the upper part of the outer periphery of the inner cover 6, a water reservoir board 21 is provided which has a ring shape and expands outward from the lower end to the upper end. The lower end of this water reservoir board 21 is connected to the inner cover 6 so that it has a predetermined gap with the outer peripheral surface of the inner cover 6.
(or the cooling cover 13).

The water reservoir board 21 may be provided not only on the upper part of the outer periphery of the inner cover 6 but also below it, and may be provided in two stages, upper and lower, as shown in the figure, or in more than one stage.

Next, the operation of the present invention will be explained.

After the rolling coil 5 inside the inner cover 6 is heated by the heating cover (not shown) as described above, the heating cover is removed, and the cooling cover 13 is attached as shown in the drawing. The inner cover 6 is air-cooled by the outside air sucked through the opening 15 by normal rotation of the cooling fan 14 . When the temperature drops to 350°C due to this air cooling, cooling water is sprayed from the slit 20 of the water sprinkler pipe 16 onto the top of the inner cover 6 in the form of a water film, and at the same time, the cooling fan 14 is reversed and flows from the intake and exhaust pipes 19. Allow outside air to flow toward the opening 15.

At this time, since the slits 20 are provided continuously in the circumferential direction, the cooling water flows down uniformly and radially over the entire top surface of the inner cover 6 and reaches the outer circumference of the upper end of the inner cover 6. After the water is once stored in the water collecting board 21, it flows uniformly in the form of a water film from the gap between the lower end of the water collecting board 21 and the outer periphery of the inner cover 6. Further, if a water reservoir sill plate 21 is appropriately provided below the cooling water, the cooling water will be stored in the sill plate 21 again and then flow down.

The steam generated by the cooling is appropriately exhausted by an air flow flowing from the intake/exhaust pipe 19 to the opening 15.

In this way, by uniformly flowing the cooling water in the form of a water film over the entire inner cover 6, the inner cover 6
It becomes possible to uniformly cool the rolling coil 5 with the atmospheric gas without causing temperature unevenness in the atmospheric gas that is forcedly circulated therein.

[Effects of the Invention] As is clear from what has been described in detail above, the present invention provides the following excellent effects.

(1) A slit is provided in the circumferential direction at the bottom of the water pipe, and water is sprayed from the slit onto the top of the inner cover in the form of a water film, and a water reservoir plate is provided at the top of the outer periphery of the inner cover, so that the entire inner cover Allows cooling water to flow evenly.

(2) Cooling water can be uniformly flowed over the entire inner cover, improving cooling efficiency, shortening the cooling time, and improving the annealing ability of the rolled coil.

(3) Since there is no temperature unevenness on the inner cover,
Thermal stress can be reduced and the life of the inner cover can be extended.

(4) Uniform cooling of the inner cover improves the quality of rolled coils.

[Brief explanation of drawings]

Fig. 1 is a sectional view of essential parts showing an embodiment of the cooling device for a coil annealing furnace according to the present invention, Fig. 2 is a partial bottom view of the water spray pipe shown in Fig. 1, and Fig. 3 is a conventional coil annealing furnace. 4 is a partially enlarged view of FIG. 3, and FIG. 5 is a side view of FIG. 4. In the figure, 5 is a rolled coil, 6 is an inner cover,
13 is a cooling cover, 16 is a water pipe, 20 is a slit, and 21 is a water reservoir board.

Claims (1)

[Scope of utility model registration request] an inner cover for surrounding the rolled coil to isolate it from outside air and for annealing the rolled coil;
In a cooling device for a coil annealing furnace equipped with a cooling cover that surrounds the inner cover and air-cools and water-cools the outer periphery of the inner cover, an annular water sprinkler pipe is provided at the upper center of the inner cover,
A slit is formed in the lower circumferential direction of the water sprinkling pipe to spray cooling water onto the top of the inner cover in the form of a water film,
A cooling device for a coil annealing furnace, characterized in that a water reservoir plate is provided above the outer periphery of the inner cover to allow cooling water to flow down in the form of a water film on the outer periphery of the inner cover.