JPS6218608B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for conveying a strip made of various materials during heat treatment while continuously conveying the strip.

Recently, in continuous annealing furnaces for aluminum alloys, copper alloys, etc., jets of hot or cold air are applied to both the top and bottom surfaces of the horizontal strip in order to heat or cool the strip to a uniform temperature without damaging the strip surface. A floating method is used in which the strip is transported through the furnace in a suspended state by the wind pressure. However, in this case, the weight of the strip needs to be supported by the wind pressure, so the floating level changes depending on the thickness of the strip, and in the case of a heavy strip, due to a slight defect in the shape of the base plate, it will meander in the thickness direction and fall to the bottom. The strip will come into contact with a wind pressure generating device such as a plenum chamber (wind box), and the strip surface will be scratched.
In order to prevent this, the blower for generating wind pressure, the air passage, the plenum chamber, etc. must have a large capacity, and the power consumption will also increase.

This invention solves the above-mentioned conventional drawbacks,
The object of the present invention is to provide a method for conveying a strip in which the amount of meandering in the thickness direction of the strip is small and the strip can be conveyed without damaging the surface of the strip.

However, when heat treating the strip while continuously transporting the strip, the upper edge of the strip arranged so that the width direction is substantially vertical is pinched by a pinch roller, and the strip is suspended by the pinch roller. It is characterized in that the strip is transported in the longitudinal direction.

The present invention will be explained in more detail below with reference to the drawings.

In the figure, 1 is an annealing furnace, 2 is a furnace body, 3 is a heating chamber, and 4 is a cooling chamber. Reference numeral 5 denotes a strip, which is arranged so that its width direction is vertical.The end of the strip on the furnace inlet 6 side is wound around a coil unwinding machine (payoff reel) through a tension device, etc., and the end on the furnace outlet 7 side The ends of the strips are similarly wound on a coil winding machine (coiling reel) via a tensioning device or the like. The coil unwinding machine, coil winding machine, tensioning device, etc. (all not shown) are equipped with reels, rollers, etc. that rotate around a vertical axis. Reference numeral 8 designates a pinch roller for pinching the upper end edge 9 of the strip 5. Axes 12 and 13 are protruded from a bracket 11 fixed to the furnace ceiling 10, and swing plates 14 and 15 are respectively attached to these shafts. Shafts 18 and 19, which are rotatably mounted around the shaft and have rollers 16 and 17 fixed to their lower ends, are passed through the furnace ceiling 10 through a suitable airtight device, and these shafts are connected to the bearing 20.
They are rotatably attached to the rocking plates 14 and 15, respectively. A compression spring 21 generates a clamping force on the rollers 16 and 17, and is fitted between the two swing plates 14 and 15 by fitting into seat plates 22 and 23 fixed to each swing plate. As shown in the first figure, the shafts 18 and 19 are arranged with their lower ends slightly inclined toward the strip advancing direction X. Reference numeral 24 denotes a presser roller that engages with the upper end edge 9 of the strip to prevent the strip from rising too much.A shaft 25 to which this roller is fixed passes through the furnace side wall 26 via a suitable airtight device and is attached to a bearing 27. It is rotatably supported by. 28 is a bracket for mounting the bearing 27 and is fixed to the furnace side wall 26. Reference numeral 29 denotes a guide having a U-shaped cross section to prevent the lower end edge 30 of the strip from excessive meandering in the thickness direction, and is fixed to the hearth bottom 31 and has a gap of about 10 mm between it and the surface of the strip 5. It is. An electric heater 32 is a strip heating source and is attached to the inner surface of the furnace side wall 26 of the heating chamber 3. Reference numeral 33 denotes a plenum chamber (wind box) for blowing out cold air that is disposed on both the left and right sides of the strip 5 in the cooling chamber 4, and is connected to a cold air supply source (not shown) via piping, and a large number of chambers are provided on the blowing surface 34 facing the strip. Small hole 35 for blowing out cold air
It is equipped with Note that a duct or the like (not shown) is provided so that the cold air blown into the cooling chamber 4 from the plenum chamber 33 flows back to the blower suction port side of the cold air supply source.

In order to carry out the conveyance and annealing of the strip using the apparatus constructed as described above, the upper edge 9 of the strip 5 is held between the rollers 16 and 17 of the pinch roller 8, so that the strip can be freely moved in the longitudinal direction by these rollers. The suspended strip 5 is heated by an electric heater 32 while being driven in the direction of arrow X by a coil winder or the like outside the furnace. Strip 5 is roller 1
The weight of the strip is supported by 6 and 17, and the strip 5
As the rollers 16 and 17 are transferred in the direction of arrow X,
rotates as an idler, and at this time the shafts 18, 19
Since the strip 5 is inclined in the direction of the arrow X, the strip 5 is guided slightly upward as shown by the arrow Y in FIG. The upper end edge 9 of the strip is maintained at a predetermined vertical position by the downward restraining force exerted by the presser roller 24. In addition, the upper end edge 9 of the strip is mechanically maintained at a predetermined position in the left-right direction (thickness direction) by the rollers 16 and 17, so even if there is a defect in the shape of the original plate, the strip can be maintained. The amount of meandering in the thickness direction near the lower edge 30 is reduced to about half compared to the conventional floating method in which the entire strip meanderes without mechanical positional regulation of the side edge. be. In addition, since the strip 5 is suspended at the upper edge 9, if the strip meanders around the lower edge 30 and the strip tends to incline, the downward weight of the strip will correct the inclination. As a result, the amount of meandering of the strip in the thickness direction becomes even smaller. In the heating chamber 3, only if the amount of meandering in the thickness direction becomes excessive, the guide 29 comes into contact with the lower end edge 30 of the strip to regulate its position. Further, in the cooling chamber 4, since cold air is blown out from the plenum chamber 33, the strip 5 is cooled to a predetermined temperature while being maintained in a substantially upright state by the static pressure created by the cold air. In other words, the strip 5 is aligned in the thickness direction (arrow Y
When the strip 5 approaches the jetting surface 34 of the plenum chamber 33 on one side, the static pressure formed by the jetted cold air increases, and conversely, the jetting surface 34 of the plenum chamber 33 on the other side increases.
4 and the strip 5, the static pressure created by the jet of cold air is reduced, and the resultant force of these forces restores the strip to its upright position.
At this time, as mentioned above, since the amount of meandering in the thickness direction of the strip is small, even if the distance between the jetting surface 34 of the plenum chamber and the strip 5 is small, the surface of the strip will not be damaged, and furthermore, the strip's own weight can be reduced by wind pressure. Since there is no need for support by a wind pressure generating device such as a blower, the capacity of the wind pressure generating device such as a blower can be small, and the power consumption can be small.

Although there may be slight impressions caused by the rollers 16 and 17 near the upper edge 9 of the strip, the edge is prone to overheating or overcooling and has a poor structure, so it is not recommended for use. In the end, the upper end edge may be cut off after the heat treatment.

In the above embodiment, by setting the amount of inclination of the shafts 18 and 19 in the strip advancing direction to an appropriate amount in consideration of strip slippage, etc., the presser roller 2
4 may be omitted, and the guide 29 may also be omitted depending on the strip thickness and speed. Further, in the above embodiment, since the heating is performed by the electric heater 32, the width of the furnace can be made particularly small and compact, but a plenum chamber, jet nozzle, etc. that blows out hot air may be used instead.

Although the above description has been made regarding the case of annealing the strip, the present invention can also be applied to conveying the strip during heat treatment other than annealing.

As explained above, according to the present invention, the upper edge of the strip arranged so that the width direction is substantially vertical is pinched by the pinch rollers, and the strip is transported in the longitudinal direction in a suspended state. , the area near the upper edge of the strip is reliably maintained in a predetermined position, and the meandering in the thickness direction near the lower edge of the strip is suppressed, resulting in strip damage caused by contact with in-furnace equipment such as electric heaters and plenum chambers. Surface scratches are prevented. Furthermore, since the strips are arranged vertically in the width direction, especially in the case of wide strips, the installation area of the furnace can be smaller than in the case where the strips are arranged horizontally in the width direction.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an annealing furnace showing an example of the apparatus used to carry out the method of the present invention, and FIG.
The enlarged cross-sectional view taken along the line A-A in the figure, and the same figure as B-B in Figure 3.
It is a line enlarged sectional view. 1... Annealing furnace, 5... Strip, 8...
Pinch roller, 9... upper edge portion, 16... roller, 17... roller.

Claims (1)

[Claims] 1. When heat-treating the strip while continuously transferring it, the upper edge of the strip arranged so that the width direction is almost vertical is pinched by a pinch roller, and the strip suspended by the pinch roller is A method of conveying a strip, characterized by conveying the strip in a direction.