JPH0791591B2 - Method and apparatus for threading in continuous annealing furnace - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a threading method and apparatus for a horizontal continuous annealing furnace for steel strips.

[Conventional technology]

In the horizontal continuous annealing furnace for steel strip, when threading the steel strip through the furnace from the state where there is no steel strip in the furnace, when the furnace temperature is at or near room temperature, Workers can enter and work. However, when the furnace temperature is a high temperature atmosphere, a special device is required for threading.

The conventional threading method is as shown in FIG. 6, in which a nichrome wire made of a heat resistant material is always used in the annealing furnace 1.
After passing through 10 etc. and winding it with a winch 9 (Japanese Patent Publication No. 57-3735), or a rod 11 called a threading bar shown in FIG. 7 is placed on a large number of rolls 2 provided in the annealing furnace 1. There is a method of mounting and guiding the wire rope 6 through.

In the method shown in FIG. 6, since the nichrome wire 10 is exposed to the high temperature furnace for a long time, even a heat resistant material is deteriorated.

The method shown in FIG. 7 requires a space (usually three times the pitch of the rolls in the furnace) for processing the threading bar 11 before and after the annealing furnace 1 and arranges many rolls 2 in the furnace. There is a need. In this case, the furnace temperature is 1000
If the temperature is higher than 1200 ° C, an expensive alloy or a water-cooled roll is required as the roll material. The water-cooled roll has a large amount of heat removal and generates energy loss of about 10 ⁵ kcal / h per roll.

[Problems to be solved by the invention]

 The present invention aims to solve the following problems.

(1) Threading can be easily performed.

(2) Threading wire rope, etc. provided in the furnace should be able to withstand long-term use in a high temperature furnace.

(3) To reduce the number of rolls provided in the furnace to improve the furnace efficiency.

(4) Reduce the space before and after the furnace.

[Means for solving problems]

a) In the high temperature furnace, the endless threading wire rope is constantly rotated at a low speed, and the wire rope is cooled outside the furnace so that it can be used for a long time.

b) One end of the steel strip is connected to this endless wire rope via a tow rope and is passed through.

The apparatus of the present invention capable of suitably carrying out the above method is provided with drum devices respectively on the inlet side and the outside of the outlet side of the horizontal continuous annealing furnace for steel strips, and endless wire ropes are installed on both drum devices in the furnace. It is a threading device in a horizontal heat treatment furnace for steel strips, which is equipped with cooling devices for the endless wire ropes outside the furnace on the inlet side and the outlet side of the annealing furnace.

[Action]

 The method of the present invention has the following functions.

i) Since the endless threading wire rope is constantly rotated at a low speed and cooled, it can be used for a long time and the threading work becomes extremely easy.

ii) The number of rolls can be minimized by not using furnace rolls for threading work.

iii) By not using a device such as a threading bar that projects from the inside of the furnace to the outside of the furnace, the space before and after the furnace can be minimized.

〔Example〕

1 and 2 show an embodiment of the present invention. Continuous annealing furnace 1
An in-furnace roll 2 is disposed inside, and a steel strip 3 to be processed in the furnace passes through. This is the same as a normal horizontal furnace. The threading tile 4 is arranged in the continuous annealing furnace 1. Details of the structure of the threading tile 4 are shown in FIG. The threading tile 4 is arranged in the furnace above the furnace roll 2. The wire rope 6 for threading is the drum device 5
Is always rotating at low speed. The part of the threading wire rope 6 that is exposed to the outside of the furnace is cooled by an air blower 7. When the furnace is operating normally and the steel strip 3 is inside the furnace, the wire rope 6 is in the state shown in FIGS. 2 and 4. Since the drum 5 is constantly rotating at a low speed, the wire rope 6 is moving on the threading tile 4. At this time, since the part of the wire rope 6 that has come out of the furnace is always cooled by the cooling air from the blower 7, when the wire rope 6 goes around the drum 5 and enters the furnace again, the cooled wire The rope 6 will enter.

When performing the threading work, the wire rope 6 is removed from the threading tile 4 and shaken on the outside of the furnace on the inlet side or the outlet side of the furnace, or the wire rope 6 is wound up by the drum device 5 to move the wire rope 6 to the threading tile 4
Completely remove it and position it at the position 6a shown in FIG.

After the above work is completed, as shown in Fig. 5, a metal fitting for the tow rope 8 having a thickness for pulling the steel strip 3 on the wire rope 6a is fixed.
In the furnace, by connecting at 12 and connecting, for example, one of the broken steel strips to the tow rope 8 and winding the drum device 5 from the inlet side to the outlet side of the furnace or from the outlet side to the inlet side. The steel strip 3 can be passed through.

In this embodiment, the threading tile 4 is shown attached continuously to the inner wall of the furnace, but the present invention is not limited to this and may be provided intermittently. If the furnace length is short, the threading tile can be omitted.

〔The invention's effect〕

According to the present invention, threading work can be easily performed in a high temperature furnace. Further, the number of rolls in the furnace can be minimized, and the furnace as a whole is an energy-saving type furnace with less heat removal from the rolls.

[Brief description of drawings]

1 and 2 are a longitudinal sectional view and a transverse sectional view of an annealing furnace showing an embodiment of a threading device suitably used for carrying out the method of the present invention, and FIG. 3 is a partially enlarged view of FIG. FIG. 5 is a perspective view thereof, FIG. 5 is a perspective view showing a threading operation state, and FIGS. 6 and 7 are explanatory views of a conventional threading method. 1 ... Annealing furnace 2 ... Furnace roll 3 ... Steel strip 4 ... Threading tile 5 ... Drum device 6 ... Wire rope 7 ... Cooling blower 8 ... Wire rope (for pulling steel strip) 9 ... … Winch 10 …… Nichrome wire 11 …… Threading bar 12 …… Wire rope tightening bracket

Claims (2)

[Claims] 1. An endless wire rope is circulated in the inlet and outlet direction of a horizontal continuous annealing furnace for steel strips, and one end of the steel strip is connected to the endless wire rope via a pulling rope into the furnace. A threading method in a continuous annealing furnace characterized by passing through. 2. A horizontal strip continuous annealing furnace for steel strips is provided with a drum device on the outside of the furnace and at the outside of the oven, and endless wire ropes are hung on both drum devices so that they can run inside the furnace. A threading device for a continuous annealing furnace, wherein a cooling device for the endless wire rope is provided outside the inlet and outlet furnaces.