JPH08193285A - Restoration method and the time of rupture of steel strip in continuous pickling line - Google Patents

Abstract

PURPOSE: To ensure the efficient and safe execution of restoration in the event of a rupture of a steel strip in a continuous pickling vessel for the steel strip in the state of holding the cover of the pickling vessel mounted. CONSTITUTION: An acid resistant rope fixing a steel sheet 2 at the inlet side end is held hung and mounted at the rope engaging hook fixed on the inner side of the pickling vessel cover 8. An inlet side loop car 11 is moved in a direction of increasing a loop quantity to pull the steel strip 15 outside the pickling vessel and thereafter the ruptured surface of the inlet side steel strip and the steel sheet 2 are welded in the event of the rupture of the steel strip 15 within the pickling vessel. The acid resistant rope is then pulled by a winch toward an outlet side and an outlet side loop car 11 is moved in a direction of increasing the loop quantity while the inlet side loop car 11 is moved in the direction of decreasing the loop quantity, by which the rupture surface of the outlet side steel strip pulled outside the pickling vessel and the rupture surface of the inlet side steel strip pulled out by traction of the acid resistant rope are welded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recovering from strip steel breakage in a continuous pickling line for strip steel, and more specifically, to a strip steel breakage in a pickling tank or in a portion other than the pickling tank. , So that recovery work can be carried out efficiently and safely,
The present invention relates to a new restoration method for preventing a decrease in operation efficiency in a continuous pickling line for strip steel.

[0002]

2. Description of the Related Art Conventionally, in a continuous pickling line for strip steel, it takes a long time to restore the connection when a break occurs during strip running of the strip. Therefore, this restoration work should be performed efficiently and in a short time. Was very important for the operation efficiency of the continuous pickling line for steel strip.

In order to shorten the recovery time, it is important to find the location where the steel strip breaks early and shorten the recovery time itself. As a method of detecting the strip steel breakage and the occurrence location, particularly regarding the strip steel breakage in the pickling tank, it is not based on the operator's judgment, but a detection method by a device such as a limit switch has already been disclosed, and an automatic alarm or An automatic stop system etc. is incorporated. However, the recovery method has been carried out by extremely inefficient and dangerous work.

Specifically, of the broken steel strips, first, the strip steel on the outlet side is wound up by a winder and drawn to the outlet side, and then the fracture surface of the strip steel on the inlet side in the pickling tank is searched for. By winding a rope around one end of the rope and pulling it with a crane, etc., the steel strip on the inlet side is gradually moved into the tank, pulled to the outlet side, and then the steel strip previously pulled out is broken. The method is to restore the connection by cross-section and welding.

Further, when the strip steel is broken except in the pickling tank,
For example, when a strip steel breaks in the loop car, it is necessary to move the strip steel to a position where it can be connected with a winch or the like to restore the connection. It was

[0006]

When a strip steel rupture occurs in a continuous pickling line for strip steel, for example, a rupture occurs in the pickling tank, the pickling tank cover is removed and the strip end surface of the strip steel is removed. The rope is wound around and the steel strip is gradually moved.However, if the steel strip breaks near the entrance side, the movement distance becomes long and the rope slips easily, causing the rope to come off the fracture surface during movement. In many cases, the rope is caught on the partition between the pickling tanks and comes off, and it is necessary to hang the rope again.Therefore, it is necessary to carefully move the steel strip over time, which is extremely inefficient and dangerous. It was working.

Moreover, the work on the upper part of the pickling tank is greatly affected by fumes due to the acid, and the long-term restoration work is extremely dangerous from the viewpoint of safety and hygiene. Also, if a strip steel breaks in a place other than in the pickling tank, it is necessary to move either or both of the entry side exit side and the fracture end surface to a connectable position to restore the connection. Since the tension of the steel strip is strong in places other than the wash tank, the distance between the fractured surfaces of the steel strip becomes large, and it is difficult to install a winch or other device for moving the steel strip, which also requires a great deal of time. It was

The present invention has been made to solve the above problems, and an object of the present invention is to provide a restoration method for improving the efficiency of the restoration work when a strip steel is broken.

[0009]

SOLUTION OF THE PROBLEM The recovery method at the time of steel strip breakage in the continuous pickling line for steel strip according to the present invention is to connect a steel plate to one end of the acid resistant rope against the steel strip breakage occurring in the pickling tank. Using the jig, after moving the inlet loop car in the direction of increasing the loop amount and pulling the strip steel out of the pickling tank, weld the fracture surface of the inlet strip steel and the steel plate of the jig, and then While moving the incoming loop car in the direction of decreasing the loop amount, pull the jig in the outgoing direction by a winch or a crane to move the outgoing loop car in the direction of increasing the loop amount, or rotate the winder normally. The recovery work is carried out by welding the fracture surface of the outgoing strip steel pulled out of the pickling tank and the fracture surface of the incoming strip steel pulled by the jig.

In the case other than in the pickling tank, a pedestal on which a dummy strip steel is placed is prepared in advance, and at the time of rupture, the pedestal is moved to the fracture point to connect the strip steel fracture surface and the dummy strip steel end surface, It is to carry out recovery work.

[0011]

[Operation] In the recovery method at the time of fracture of the strip in the continuous pickling line for strip according to the present invention, when the fracture location is in the pickling tank, it is fixed to the end of the acid-resistant rope provided in advance. Since the steel plate and the steel strip fracture surface are welded and the other end of the rope is pulled to pass through the pickling tank, the acid-resistant rope does not come off as in the past, and recovery work can be completed in a short time. This is possible, and this work can be performed with the pickling tank cover attached.

When the steel strip rupture occurs outside the pickling tank, the fracture surfaces are often separated from each other due to the high tension. Therefore, a dummy strip steel is inserted between both fractured surfaces, the tip of the dummy strip steel is welded to one fractured surface of the fractured strip steel, and then the dummy strip steel is fed out and the other end of the fractured strip steel is fractured. By welding the fractured surface of the strip steel, the recovery work can be completed without moving the fractured strip steel.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for recovering from a strip steel breakage in a strip steel continuous pickling line according to the present invention will be described in detail below with reference to the drawings. FIG. 1 shows an overall view of the equipment of a continuous pickling line for steel strip and the flow of steel strip. In FIG. 1, reference numeral 7 is a continuous pickling tank composed of a plurality of pickling tanks 7a, and a pair of entrance side tension bridle rolls 9a, 9b are provided on the entrance side 7A of the continuous pickling tank 7. An entry side steering roll 10 and an entry side loop car 11 are provided. A pair of outlet tension bridle rolls 12A and 12B, an outlet steering roll 13 and an outlet loop car 14 are provided on the outlet 7B of the continuous pickling tank 7. The steel strip 15 is passed through the entry loop car 11 and subjected to posture control by the entry steering roll 10 so as not to meander, and then the entry tension bridle roll 9 is inserted.
After passing through A and 9B, it is guided to the continuous pickling tank 7 and pickled.
The strip steel 15 that has passed through the continuous pickling tank 7 passes through the exit side tension bridle rolls 12A and 12B and the exit side steering roll 13 to reach the exit side loop car 14, and is wound by a winder (not shown). To be

As shown in FIG. 2 and FIG. 4, a steel plate 2 is connected to one end of the acid resistant rope 1 used for recovering the strip steel that has been broken in the pickling tank. As shown in FIG. 1, the rope is hooked by rope hooks 16 fixed at several places inside the pickling tank cover 8.
The connection side of the steel plate 2 of the acid resistant rope 1 is wound around or fixed to the pickling tank inlet side 7A, and the other end is wound or fixed to the outlet side 7B.

In the above structure, when the strip steel 15 is broken in the continuous pickling tank 7, the window of the pickling tank cover 8
The acid resistant rope 1 is removed from the rope hook 16 and the entry side loop car 11 is moved in the loop amount increasing direction to weld the entry side fracture surface of the strip steel 15 pulled out of the pickling tank 7 to the steel plate 2. . Then, tie a new acid resistant rope to the acid resistant rope 1. Then, the acid resistant rope 1 is pulled toward the exit side of the pickling tank by a winch installed separately while moving the entry side loop car 11 in the direction of decreasing the loop amount, or by using a crane. Similarly, the exit loop car is moved in the direction of increasing the loop amount, or the winder is rotated forward and stopped at a position where the exit fracture surface of the strip steel 15 pulled out of the pickling tank 7 can be welded. After cutting off the steel plate 2 from the entrance side fracture surface, the entrance side fracture surface and the exit side fracture surface are welded,
Restart pickling work. The new acid-resistant rope that has passed through the pickling tank is suspended on the pickling tank cover 8.

FIG. 5 shows a pedestal 3 to be used when recovering a strip steel that has been broken at a place other than the pickling tank. The pedestal 3 is provided at its lower portion with casters 17 and the like that can be moved back and forth and left and right. , Two small rolls 4 on the pedestal 3 at appropriate intervals
Is installed. A dummy strip steel 5 preferably having a length corresponding to the maximum movement distance of the entry loop car 11 is always installed on the roll 4, and by pulling the strip steel tip 6, the small roll 4 is rotated and fed out. I can do it.

In the above-described structure, when the strip steel 15 breaks, for example, in the entry side loop car 11, the pedestal 3 on which the dummy strip steel 5 is installed is moved to the breaking point, and one end of the fracture surface of the strip steel 15 and the dummy. Welding the steel strip tip 6 and the dummy steel strip 5
While feeding, the pedestal 3 is moved to the other breaking point and the end of the dummy strip steel 5 and the fracture surface at the other end are welded. After that, the pedestal 3 is moved to the outside of the entry loop car 11 and the pickling operation is restarted.

The dummy strip steel is used as a dummy strip steel again by cutting the welded portion by a cutter and coiling it.

[0019]

EFFECTS OF THE INVENTION According to the method of recovering a strip steel in a continuous pickling line for strip steel according to the present invention, the following effects can be obtained. When the steel strip breaks in the pickling tank, the acid resistant rope installed in the pickling tank is used for restoration work, but the steel plate is fixed to the acid resistant rope and cannot be easily removed. As a result, the work can be performed easily and quickly, and the recovery time of the steel strip rupture in the pickling tank can be greatly shortened, and according to the conventional restoration method, the pickling tank cover can be removed. It was very dangerous because it was exposed to acid fumes for a long time, but it can be done with the pickling tank cover attached, and this kind of problem does not occur.

In the case of breaking the strip steel other than the pickling tank, the fracture end face is often too far apart due to the high tension, but it is not necessary to move the fracture surface by using the dummy strip steel installed on the pedestal. It is possible to significantly reduce the recovery time for strip steel fracture.

[Brief description of drawings]

FIG. 1 is an overall schematic view of a continuous pickling line.

FIG. 2 is a view showing an acid resistant rope having a steel plate connected to one end.

FIG. 3 is a sectional view of a pickling tank.

FIG. 4 is a schematic diagram of restoration using an acid resistant rope.

FIG. 5 is a schematic view of a pedestal on which a dummy steel strip is installed.

[Explanation of symbols]

1 ・ ・ Acid-resistant rope 2 ・ ・ Steel plate 3 ・ ・ Pedestal 4 ・ ・ Small roll 5 ・ ・ Dummy strip steel 6 ・ ・ Dummy strip steel tip 7 ・ ・ Continuous pickling tank 8 ・ ・ Picking tank cover 9A, 9B ・ ・Entry side tension bridle roll 10 Entry side steering roll 11 Entry side loop car 12A, 12B Entry side tension bridle roll 13 Entry side steering roll 14 Entry loop car 15 Hanging hook 17 ... Caster

Claims (2)

[Claims] 1. An acid-resistant rope having a steel sheet fixed to the entrance end is attached to the pickling tank cover, and one end of the acid-resistant rope is broken when the steel strip breaks in the pickling tank of the continuous pickling line for steel strip. Using the jig connected to the steel plate, after pulling the strip steel out of the pickling tank by moving the entry side loop car in the direction of increasing the loop amount, the fracture surface of the entry side strip steel and the steel plate of the jig And then move the inlet loop car in the direction of decreasing the loop amount while pulling the jig in the outlet direction by a winch or a crane to move the outlet loop car in the direction of increasing the loop amount or winding. While the machine is rotating normally, the fracture surface of the outgoing strip steel pulled out of the pickling tank and the fracture surface of the incoming strip steel pulled by the jig are welded and restored. Recovery method for strip steel breakage in continuous pickling line. 2. A continuous pickling line for a steel strip, comprising a movable pedestal, rolls installed on the pedestal at appropriate intervals, and a coil-shaped dummy strip steel set on the roll. In, in the case where the strip steel ruptures in a place other than the pickling tank, the pedestal is moved to the rupture location and the pedestal after welding the tip of the dummy strip steel and the fracture surface of one of the fractured strip steels A method for recovering a strip steel in a continuous pickling line for strip steel, which comprises moving the steel strip and repairing it by welding the fracture surface of the other strip steel and the end portion of the dummy strip steel.