JPS6336048Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a strip continuous pickling equipment for removing scale formed on the surface of hot coils, etc. (hereinafter simply referred to as strips) of materials for cold strips. It is related to.

(Prior art) In continuous strip pickling equipment, after the strip is sequentially immersed and passed through pickling liquid in a plurality of pickling tanks,
The pickling solution adhering to the strip surface is washed away by sequentially spraying the rinsing solution onto the strip surface using a plurality of rinsing tanks. By the way, in each rinsing tank, fresh water is supplied to the final tank, and then from the final tank to the first tank in a sequential overflow manner, and as a result, the pickling solution washed away in each tank is mixed. The acid concentration of the water in each tank gradually increases from the last tank to the cutest tank. Conventionally, water in such a tank is used as the rinsing liquid sprayed onto the strip surface in each rinsing tank, so the rinsing effect in each rinsing tank is small. On the other hand, the strip is usually as hot as 100°C when it leaves the final pickling tank, and its cooling effect in each rinsing tank is small.

Therefore, when the line of such conventional equipment is operated at low speed or stopped, the strip surface is not only between the last pickling tank and the first rinsing tank, but also between each rinsing tank. The heat can cause the pickling solution to stick to the surface and dry while remaining. Although it depends on the material of the strip and the acid concentration of the attached liquid, if the attached liquid dries or if rinsing liquid droplets or fumes come into contact with the dried attached liquid surface, rinsing the strip surface may not completely remove the residue. A discolored area appears that is difficult to erase.
In addition, when the line is stopped, the surface of the strip that comes into contact with the ringer roll installed at the exit side of the final pickling tank is exposed to acid due to the pickling liquid that has accumulated without drying in the area sandwiched between this and the ringer roll. Washing causes discolored areas similar to those described above. Discoloration of the strip surface significantly impairs its quality.

Therefore, a method has been proposed in which water is sprayed onto the strip surface in order to keep it moist so that the strip surface does not dry out (see Japanese Patent Laid-Open No. 161543/1983).

(Problem that the invention aims to solve) However, in this conventional method, water is sprayed onto the surface of the moving strip between the final tank of the pickling tank and a spray nozzle device that sprays rinsing liquid onto the strip that is to be sent out. When the line is running at low speeds that cause discoloration of the strip surface, the strip surface may dry and discolor between each rinse tank, and when the line is stopped, the strip surface may dry and discolor between the pickling tank and the rinsing tank and between each rinse tank. I can't prevent it from happening.
Another disadvantage is that when the line is stopped, the pickling solution accumulated in the area sandwiched between the ringer roll and the strip at the outlet side of the pickling tank cannot be washed away, and discoloration of the strip surface due to this pickling solution cannot be prevented. There is.

(Means for Solving the Problems) The continuous strip pickling equipment of the present invention is equipped with a ringer roll on the outlet side of the final tank of the pickling tank, and the ringer roll can be opened when the line is stopped. In addition, a spray nozzle is provided near the ringer roll that can spray pickling liquid onto the strip surface during low-speed operation and when the line is stopped.With this configuration, discoloration of the strip surface can be prevented. When the line is operated at a speed below the speed that causes this (during low-speed operation), spray the pickling solution onto the strip surface, and when the line is stopped, spray the pickling solution onto the strip surface while opening the ringer roll to prevent accumulation. ,
This eliminates the drying and accumulation of the pickling solution on the strip surface (which causes discoloration).

(Example) An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is the final tank of a plurality of pickling tanks arranged in a series, and one or more sets of ringer rolls 2 (two sets in the example) are provided on the outlet side of the tank 1. With the catenary in the tank kept constant, the strips 3 are sequentially immersed in the pickling solution and can be transferred to a rinsing tank (not shown).

The ringer roll 2 is provided so that it can be opened and closed by a lifting mechanism (not shown).

At the exit side of the final pickling tank 1, near the ringer roll 2, there is provided a spray nozzle 4 capable of spraying a pickling liquid onto the surface of the strip 3.

The spray nozzles 4 are installed in a plurality of sets of nozzle headers 5 (5 sets in the embodiment) along the width direction which are arranged vertically opposite to each other with the strip 3 in between. The pickling solution is arranged so that it can be sprayed over almost the entire surface. This spray nozzle 4 is connected to the final pickling tank 1 by a pipe 9 via a pump 6 and valves 7,8.

In addition, 10 is a liquid return guide, and the spray nozzle 4
In order to return the pickling liquid sprayed from the pickling tank 1 to the rinsing tank 1 without dropping it into the rinsing tank, the pickling tank 1 is provided on the outlet side of the tank 1 and extends above the rinsing tank.

(Function) After pickling, strip 3 is placed on ringer roll 2.
It is then transferred to a rinsing tank. The spray nozzle 4 is not used during normal operation of the line. When the line is running at low speed, the spray nozzle 4 is communicated with the pickling tank 1 by opening the valves 7 and 8, and the pickling liquid is injected by operating the pump 6. The pickling solution is sprayed over the entire surface and never dries. When the line is stopped, the ringer roll 5 is opened and operated to prevent the pickling liquid from accumulating in the area sandwiched between the strip 3 and the ringer roll 5, and the pickling liquid is sprayed from the spray nozzle 4 using the same procedure as above. and,
The surface of the strip 3 is sprayed with pickling liquid over almost the entire surface in the vicinity of the ringer roll 2, so that it does not dry out and does not accumulate between it and the ringer roll 5.

(Effects of the invention) As described above, the present invention prevents the strip surface from drying by spraying the pickling liquid during low-speed operation and when the line is stopped, and also prevents the surface of the ringer roll and strip from drying by opening the ringer roll when the line is stopped. Since the pickling liquid accumulation area formed between the strips is eliminated and the pickling liquid is prevented from accumulating on the strip surface, discoloration of the strip surface can be reliably prevented.

[Brief explanation of the drawing]

1 and 2 are a plan view and a side sectional view schematically showing an embodiment of the present invention. 1... Final pickling tank, 2... Ringer roll, 3
...Strip, 4...Spray nozzle, 5...
Nozzle header, 6...Pump, 7, 8...Valve, 9
...Piping, 10...Liquid return guide.

Claims (1)

[Scope of utility model registration request] In a strip continuous pickling facility in which a ringer roll is provided on the outlet side of the final tank of the pickling tank, the ringer roll is provided so that it can be opened when the line is stopped, and a ringer roll is provided near the ringer roll that can be opened during low-speed operation of the line. A continuous strip pickling equipment characterized by being equipped with a spray nozzle that can spray pickling liquid onto the strip surface when the strip is stopped.