JP2995260B2 - Acid liquid backflow prevention device for pickling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pickling apparatus for continuously pickling a plate such as a steel strip while passing the plate through a pickling tank with a pickling solution jetted from a pickling supply header. The present invention relates to an acid liquid backflow prevention device for a jet pickling facility for preventing a washing liquid from flowing back into a preceding tank (previous tank) and overflowing out of the tank.

[0002]

2. Description of the Related Art Conventionally, as pickling equipment for a plate to be processed such as a strip of steel after hot rolling, the pickling of a plate passing through each of the pickling tanks arranged in the line direction at the entrance and the exit of the tank is known. 2. Description of the Related Art A jet pickling apparatus that performs an acid pickling process by injecting an acid solution toward a surface is known. One example will be described with reference to FIG. 2. Liquid collecting chambers 2 and 3 are formed at the front and rear portions of a tank main body 1 extending in the line direction. Wash tanks are arranged in the line direction adjacent to each other. A support skid 4 is provided in each tank at the front and rear portions and, if necessary, at an intermediate portion thereof. The plate 5 to be processed travels in a substantially central position of each tank in one direction while being supported by the support skids 4. Has become. Acid solution supply headers 6 and 7 are provided on the inlet side and the outlet side of the tank body 1 for injecting the acid solution into the tank body and toward the surface of the plate 5 to be processed. A linger roll 8 for squeezing out the acid solution adhered to the front and back surfaces of the plate 5 to be processed is provided in the outlet liquid collecting chamber 3 slightly downstream of the supply header 7. During normal operation, the acid solution injected from the both acid solution supply headers 6 and 7 fills the tank body 1 and passes under the header into the inlet and outlet collecting chambers 2 and 3. After being discharged from a discharge port 9 at the bottom of each liquid collecting chamber and subjected to a regeneration treatment, the liquid is again supplied to the tank body 1 from the acid liquid supply headers 6 and 7 and the acid liquid supply port 10 in the tank.

In this type of pickling apparatus, when the traveling speed of the plate to be processed increases, the acid solution flows into the rear tank over the pickling supply header on the outlet side due to the viscosity of the acid liquid, and the acid liquid flows between the plurality of tanks. The phenomenon that the acid solution is mixed occurs. When the acid solution is mixed, the acid concentration changes, causing a problem in the pickling treatment. For this reason, it has been conventionally proposed to attach a guard plate for preventing transfer of the acid solution above the acid solution supply header to prevent the acid solution from overflowing to the adjacent tank (Japanese Utility Model Laid-Open No. 4-7661).

[0004]

In a conventional jet pickling apparatus, the running of the plate to be processed is stopped from a normal operation state such as when the line is stopped or when the acid solution in the tank is replaced, and the acid solution supply header is used. When the supply of the acid solution from the tank is stopped, the acid solution filled in the tank body cannot be completely discharged from the outlet in the tank body, and flows back to another tank through the periphery of the acid solution supply header (FIG. 3). , 27), and sometimes overflows out of the tank. FIG. 3 is a partially enlarged view showing the state at this time. The acid solution in the tank main body 1 passes over the ringer roll 8 along the upper surface of the plate 5 to be stopped, or passes through a gap between the upper and lower ringer rolls 8 on the side of the plate to be processed to another tank adjacent thereto. It flows in as indicated by reference numeral 26. Further, although the liquid collecting chambers 2 and 3 of the adjacent front and rear tanks are partitioned by the partition wall 11, the acid solution flowing out along the plate 5 to be treated flows between the ringer roll 8 and the partition wall 11. Flows into the other liquid collecting chamber 3 (reference numeral 2).
7). The acid solution recovered through the outlet 9 of each of the liquid collecting chambers 2 and 3 is reused again in the same tank corresponding to the liquid collecting chamber.
When the acid solution flows into the other liquid collecting chamber, the acid concentration changes when the operation is restarted, which causes a problem in the pickling treatment. The above-mentioned actual opening 4-
The pickling solution guard device disclosed in JP-A-7661 is a measure for preventing overflow of the acid solution during operation, and the same problem as described above occurs when the line is stopped. Particularly in an acid cleaning apparatus in which the amount of the acid solution spouted from the acid solution supply header is large, the acid solution outflow when the line is stopped is large,
There was a risk of overflowing outside the tank and causing a major accident.

The present invention prevents the acid solution from overflowing to another tank or out of the tank when the plate to be processed is stopped, thereby preventing mixing of the acid solution between the tanks and ensuring safety. It is an object of the present invention to provide an acid liquid backflow prevention device for an acid pickling facility, which achieves cost reduction by securing and reducing an acid supply amount.

[0006]

According to one aspect of the present invention , two chambers are arranged in a line direction between adjacent pickling tank bodies.
A liquid collection chamber which is cut and has a bottom deeper than the bottom of the tank body
And each of the tank chambers disposed in each of the partition chambers of the liquid collection chamber.
An acid that sprays and supplies pickling liquid onto the plate to be processed into the body
A pickling facility having a liquid supply header;
Adjacent to the outside of the acid solution supply header in each partition chamber
Two sets of seal nozzle headers to be arranged and the liquid collection chamber
Ringerlow provided between the seal nozzle headers
Le and the treated plate acid solution backflow prevention device of pickling equipment having a control device which gradually controlled so as to decrease when the running line stop the discharge amount of the acid solution supply pump of the acid liquid supply header of providing Is done.

According to another aspect of the present invention, a pickling solution is supplied from an acid solution supply header disposed on an inlet side and an outlet side of a pickling tank, and the pickling solution is moved toward the inside of the pickling tank and travels. In a pickling facility for spraying and supplying onto a plate, a backflow prevention device for an acid solution of a pickling facility in which a seal nozzle header is provided adjacent to the acid solution supply header and a switching valve is provided in a supply pipe connected to these headers. Is provided.

According to still another embodiment of the present invention, the pickling solution is supplied from the acid solution supply headers provided on the inlet side and the outlet side of the pickling tank toward and inside the pickling tank. In the pickling equipment for injecting and supplying onto the plate, the discharge amount of the acid solution supply pump of the acid solution supply header is controlled to be gradually reduced when the traveling line of the plate to be processed is stopped , and the tank body
The level of the acid solution in the section is
The acid liquid supply header and the
A control device for stopping the operation of the seal nozzle header is provided, and an acid solution backflow prevention device is provided in which a seal nozzle header is provided adjacent to the acid solution supply header and a switching valve is provided in a supply pipe connected to these headers. You.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional view of a jet pickling apparatus for a strip steel plate (plate to be processed) 5 according to one embodiment of the present invention. In this figure, the same reference numerals are given to the same functional portions as those of the conventional example shown in FIG. 2, and the overlapping description is omitted as much as possible. In the present embodiment, the liquid collecting chambers 2 on the inlet side and the outlet side of each tank body 1 are provided.
3 are provided with seal headers 12 and 13 for injecting the seal liquid obliquely toward the front and back surfaces of the strip steel plate 5 and toward the center of the tank body 1. Each seal header 1
2 and 13 are disposed at positions outside the tank body 1 of the acid solution supply headers 6 and 7 adjacent to the inlet and the outlet of each tank body 1, but inside the liquid collecting chamber 3 inside the ringer roll 8, That is, it is arranged between the outlet-side acid solution supply header 7 and the ringer roll 8. In addition, these seal headers 12 and 13 are arranged with a plurality of spray nozzles arranged in the horizontal direction so as to cover the entire width direction of the steel strip 5. Seal header 1
The same acid solution as the acid solution of the corresponding tank body 1 is supplied from the sub-tank 14 by the pump 15 through the switching valves 16 and 17 to the sealing liquid injected from the tanks 2 and 13 toward the steel strip 5. The acid solution spouted from the acid solution supply headers 6 and 7 is supplied from the sub tank 14 by the pump 15 to the switching valve 21,
Supplied via 22. Similarly, the same acid solution is supplied from the sub tank 14 via the pump 15 and the switching valve 23 from the acid solution supply port 10 opened to the tank body 1. Each switching valve 16,
17, 21, 22, and 23 are control devices 24 outside the tank.
The opening / closing operation of the pump 15 is controlled, and the drive motor 25 of the pump 15 is controlled by the control device 24, whereby the discharge amount of the acid solution from the acid solution supply headers 6, 7 is adjusted.

When the strip steel sheet 5 is pickled in a normal state, the acid solution supply headers 6 and 7 and the acid solution supply port 10 are used.
The switching valves 21, 22 and 23 are opened, and the strip steel 5 is run while pickling by supplying the acid solution into the tank, and the overflowed acid solution is discharged to the outlet 9 of the collecting chambers 2, 3 and the tank. Main unit 1
Is returned to the sub-tank 14 via the pipes 19 and 20 from the discharge port 18 in the tank. When the running of the steel strip 5 is stopped to remove the acid solution in the tank, the acid solution supply headers 6, 7 and the switching valves 21, 22, and 23 of the acid solution supply port 10 in the tank are closed,
The supply of the acid solution is stopped and the seal headers 12 and 13 are stopped.
The switching valves 16 and 17 are opened to discharge the acid solution from the headers 12 and 13. The acid solution directed to the center side of the tank body 1 by the acid solution jets of the acid solution supply headers 6 and 7 flows backward along the upper surface of the strip steel plate 5 when the headers 6 and 7 stop.
The effluent drops downward just before the seal headers 12 and 13 due to the injection from the seal headers 12 and 13 and is prevented from flowing out into a conventional tank. The operating time of the seal headers 12 and 13 is determined by the size of the tank and the size of the discharge port 18. In general, the operation is stopped when the level of the acid solution in the tank body 1 becomes lower than the height of the supporting skid 4. Is set by the control device 24 so that

[0012] By stopping examples acid solution supply header 6 described above, it is configured to cut off the acid solution to back flow seal header 12, 13, specifically, intracisternal acid solution supplied during line stops The supply of the acid solution from the port 10 is stopped, and the ejection amount of the acid solution supply headers 6 and 7 is controlled by the control device 24.
Control by the control of the drive motor 25, the acid solution which is about to flow out along the plate surface of the steel strip is prevented by the injection of the headers 6 and 7, and as the acid solution in the tank decreases, the header 6, 6 7 to reduce the amount of ejection. Also in this case, the reduction rate of the ejection amount of the acid solution supply headers 6 and 7 is determined by the size of the tank and the discharge amount of the discharge port 18 in the tank, and when the acid solution in the tank becomes lower than the supporting skid, the headers 6 and 7 are reduced. May stop completely.

The present invention may further combine the prevention of acid solution outflow by injection of the seal header and the control of the ejection amount of the acid solution supply headers 6 and 7 to prevent backflow and overflow when the line is stopped. It is also possible to prevent the backflow by discharging the acid solution only from the discharge port 18 in the tank without operating the seal header and keeping the ejection amount of the acid solution supply header constant. However, in this case, the acid solution ejected from the acid solution supply headers 6 and 7 flows into the tank, so that it takes time to drain the liquid from the tank. It is needless to say that the supply amount of the acid solution from the acid solution supply headers 6 and 7 should be smaller than the discharge amount of the discharge port 18 in the tank.

[0014]

As described above, according to the present invention, only a seal header is provided adjacent to an acid solution supply header.
Alternatively, the simple operation of controlling the amount of the acid solution supply header jet can prevent the inflow of acid solution to the adjacent tank side or overflow from the outside of the tank when the plate to be processed is stopped, and the operation is also simple. This can be performed automatically by the apparatus, and mixing of the acid solution in each tank can be avoided, so that safe and effective pickling can be performed while reducing the amount of acid consumed.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a jet pickling equipment provided with an acid liquid backflow prevention device according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a conventional jet pickling apparatus.

FIG. 3 is a partially enlarged cross-sectional view showing a state in which an acid solution in a tank flows backward from a liquid collecting chamber to an adjacent tank when the line is stopped.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tank main body part 2, 3 Liquid collection chamber 5 Plate to be processed 6, 7 Acid liquid supply header 9 Outlet 11 Partition wall 12, 13 Seal header 14 Subtank 15 Pump 16, 17, 21, 22, 23 Switching valve 18 Inside of tank Outlet 24 Control device 25 Drive motor

Claims (2)

(57) [Claims] 1. A line direction between adjacent pickling tank bodies.
Divided into two chambers and having a bottom deeper than the bottom of the tank body
A liquid collection chamber, which is disposed in each partition chamber of the liquid collection chamber, and
Inject and supply the pickling solution onto the plate to be processed into the storage tank body
An acid solution supply header having
Next to the outside of the acid solution supply header in each partition chamber of the liquid collection chamber
A seal nozzle header disposed in contact with the liquid collecting chamber;
A phosphorus provided between the two sets of the seal nozzle headers.
And Garoru, acid solution of pickling equipment and the; and a control device for controlling so as to gradually decrease the discharge amount of the acid liquid supply header acid solution supply pump during driving line stoppage of the treatment plate Backflow prevention device. 2. The acid solution supply header and the seal nose.
A switching valve must be provided for each supply pipe connected to the header.
The acid liquid backflow prevention device for pickling equipment according to claim 1, characterized in that: