JPS6312129B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of operating an annealing apparatus for a metal strip wound into a coil (hereinafter simply referred to as a strip coil).

Traditionally, patch-type annealing furnaces such as bell-type furnaces have been generally used for annealing strip coils.
Such patch-type annealing furnaces have drawbacks such as requiring complicated operations such as attaching and detaching the cover using a crane and stacking and unloading strip coils, and low thermal efficiency. In order to solve this problem, there is annealing equipment that uses a roller hearth type continuous furnace (the strip coil is moved by the rotation of the hearth roller), but in the case of the roller hearth type, the deformation of the roller due to high heat and the load of the strip coil is avoided. To prevent this, it is necessary to reciprocate the strip coil within the furnace during the heating period (referred to as in-furnace oscillation), which increases the length of the furnace.
In addition, the rollers are made of expensive heat-resistant steel and require cooling water to pass through them, resulting in high production and operating costs, and the cooling water dissipates heat, resulting in poor thermal efficiency.

Additionally, if a strip coil is charged into a heating furnace with rolling oil still attached, a large amount of oil smoke will evaporate and adhere to the inner walls of the furnace, causing trouble. However, this method requires chemical removal treatment using a degreasing agent or incineration (burn-off), but this requires equipment and space.

The present invention is aimed at eliminating the above-mentioned drawbacks and at the same time reducing the consumption of atmospheric gas.The entire annealing apparatus and its operating method will be described below with reference to the drawings.

First, the insertion device for the strip coils a, a, . . . will be explained. A horizontal shaft 3 is rotatably supported on a base 1 by bearings 2, 2, and a side surface-shaped rolling table 4.
is pivotally supported, and the overturning table 4 is constructed so that it can be raised and horizontally turned over by the operation of a cylinder 5. A pair of pillows 6, 6 are provided on one side of the rolling table 4 so that the strip coil a can be stably placed thereon, and rollers 7 are pivotally supported on the other side, and each roller is chain-driven by a motor 8. Being driven. Reference numeral 9 denotes a movable frame, and an endless chain 12 is stretched between sprockets 10 and 11 which are pivotally supported at the front and rear ends of the movable frame, and a pusher 13 is fixed to the chain 12. Therefore, when the chain 12 rotates, the pusher 1
3 can be moved back and forth. 14, 14 are roller conveyors installed in parallel on both sides of the movable frame 9. The support shaft 15 of the sprocket 10 at the front end of the movable frame 9 is rotatably supported by fixed bearings 16, 16, and the rear end of the movable frame 9 is supported by a cylinder 17 so as to be movable up and down. The support shaft 15 is linked to a motor 18 with a reduction gear. For this purpose, the cylinder 17 is contracted to tilt the rear end of the movable frame 9 downward, and while the pusher 13 is lowered below the conveyance surface of the roller conveyors 14, 14, the cylinder 5 is extended and the overturn table 4 is moved as shown by the arrow. As shown, the strip coil a placed on the pillows 6, 6 is supported on the rollers 7, 7, 7, . . . via the tray b.
Then, the rollers 7, 7, 7, . . . and the rollers of the roller conveyors 14, 14 are rotationally driven to transport the strip coil a forward. Then cylinder 1
7 and pusher 13 to roller conveyor 1.
Protrude higher than the conveying surface of chains 1 and 14.
By moving the pusher 13 in the direction of the arrow shown in the figure, the strip coils a,
Press a and a and insert into the furnace.

The heating furnace 20 is constructed with a heat insulating furnace wall, and is equipped with a radiant tube (heating tube) 21 inside, as well as a stirring fan 22 installed on the ceiling to direct the atmospheric gas inside the furnace in the direction indicated by the arrow in the figure. It is circulated as shown. Three rows of narrow roller rollers 23 are laid on the floor of the heating furnace 20, and the strip coils a, a, a pressed by the pusher 13 are supported on the roller rollers 23 via a tray. Slide it into the furnace. Reference numeral 24 indicates the entrance door, and 26 indicates a cylinder for opening and closing the entrance door. 27 is a cooling chamber formed adjacent to this heating furnace 20. Reference numeral 28 indicates an intermediate door provided between the heating furnace 20 and the cooling chamber 27, and 29 indicates a chain wheel for suspending and opening/closing the intermediate door. A drive roller 31 with a heat-resistant steel flange 30 fixed to it is rotatably supported on the floor of the cooling chamber 27 and rotated by the power of a motor 32. Strip coils a, a are placed on the flange 30 via a tray. , a are supported so that they can be transported. A stirring fan 33 and a cooler 34 are arranged on the ceiling of the cooling chamber 27 to circulate the atmospheric gas in the chamber as indicated by arrows in the figure. 35 is an exit door of the cooling chamber 27, 36 is a cylinder for opening and closing the exit door, and 37 is an extraction table. The reference numeral 38 shown in FIG. 4 indicates a storage tank for storing atmospheric gas such as non-oxidizing gas, and the storage tank is connected to the cooling chamber 2.
An ejection pipe 39 is disposed within 7. Reference numeral 44 denotes an atmospheric gas generator, and the atmospheric gas generated here is constantly supplied in small quantities to the heating furnace 20 and the cooling chamber 27. A part of it is stored in the storage tank 38 through the compressor 45. Also, 40
42 is a purifier; 42 is a purifier;
The atmospheric gas sucked in by the purifier 42 passes through the purifier 42 to remove impurities such as oil smoke, and is returned to the heating furnace 20 through the return pipe 43.

Next, a method of operating the metal strip coil annealing apparatus will be explained. When opening the inlet door 24, the intermediate door 28, and the outlet door 35 to replace the strip coils a, a, a in the heating furnace 20, in the present invention, the atmospheric gas in the storage tank 38 is discharged into the cooling chamber 27 through the jet pipe 39. By supplying a large amount of air at once, it is possible to completely eliminate the intrusion of outside air during replacement. and the radiant tube 21
The strip coils a, a, a in the heating furnace 20 are heated by heating the atmospheric gas with the heat source and rotating the stirring fan 22 to circulate the atmospheric gas. At the beginning of heating, the blower 40 is driven to circulate the atmospheric gas in the furnace to the purifier 42, thereby removing the oil smoke evaporated from the strip coils a, a, a.

In this way, the present invention circulates atmospheric gas to the purifier installed outside the heating furnace to sequentially remove the oil smoke that evaporates from the strip coil during heating. It is not necessary to remove rolling oil before entering the heating furnace, and therefore, there is an advantage that no equipment or space is required for this purpose, and the inside of the heating furnace is purified to prevent various problems caused by the adhesion of oil smoke.

In addition, the atmospheric gas generated by the atmospheric gas generator is stored in a storage tank through a compressor, and when the strip coil is replaced, a large amount of this atmospheric gas is supplied to the cooling chamber at once, thereby preventing outside air from entering. becomes easier and productivity improves. Furthermore, the strip coil is inserted into the heating furnace by the pressure of the pusher, and the free rolling rollers installed on the floor of the heating furnace are of narrow width and can be installed in multiple rows to eliminate the influence of thermal deformation. The rollers do not need to be cooled by passing water through them, and manufacturing and operating costs can be reduced. In addition, the floor of the cooling chamber is equipped with a drive roller that has a heat-resistant flange fixed around it, so the flange supports the strip coil at a distance from the circumferential surface of the drive roller itself, allowing for heat conduction. This has various advantages, such as being able to easily prevent overheating of the drive roller due to

[Brief explanation of the drawing]

The drawing shows one embodiment of the present invention.
The figure is a plan view of the annealing device, the second figure is a longitudinal cross-sectional view, and the third figure is a longitudinal sectional view.
The figure is a sectional view taken along the line XX in FIG. 2, and FIG. 4 is a sectional view taken along the line YY in FIG. a...metal strip coil, b...tray,
13... pusher, 20... heating furnace, 21... radiant tube, 22... stirring door, 23... roller roller, 24... inlet door, 27... cooling chamber, 2
8... Intermediate door, 30... Flange, 31... Drive roller, 32... Motor, 33... Stirring door, 34...
Cooler, 38...Storage tank, 39...Ejection pipe, 40...Blower, 41...Suction pipe, 42...
...Purifier, 43...Return pipe, 44...Atmospheric gas generator, 45...Compressor.

Claims (1)

[Claims] 1. An insertion device that presses a metal strip coil placed on a tray and inserts it into the furnace, a heating furnace having a radiant tube and a stirring door, and a cooling chamber adjacent to this heating furnace via an intermediate door. In this annealing equipment, multiple rows of narrow free-rolling rollers are installed on the floor of the heating furnace, and the drive roller is pivotally supported on the floor of the cooling chamber by fixing a heat-resistant flange around the floor. The atmospheric gas generated by the gas generator is constantly supplied in small quantities to the heating furnace and the cooling room, and a part of it is stored in a storage tank through a compressor, and the inlet door of the heating furnace, the intermediate door, and the outlet door are opened. When replacing the metal strip coil in the heating furnace, a large amount of the atmospheric gas in the storage tank is supplied at once from the jet pipe installed in the cooling chamber, and the metal strip coil is heated by the atmospheric gas. A method for operating a metal strip coil annealing apparatus, characterized in that the atmospheric gas is circulated to a purifier provided outside the heating furnace to remove oil smoke evaporated from the metal strip coil.