JPH06128773A - Pickling tank - Google Patents

Abstract

PURPOSE:To automatically discharge the sludge depositing on the bottom of a strip pickling tank without suspending the operation. CONSTITUTION:A suction nozzle 11 is reciprocated by a traveling device 3, and the sucked sludge is transported to a treating device through a loop hose 13. The nozzle has a skirt 10a, the suction rate is controlled to 0.3-0.8m/s and the moving speed to 2m/min when the slit width is adjusted to 3-8mm, and the nozzle width is matched with that of the pickling tank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous strip pickling tank equipped with a sludge recovery treatment device.

[0002]

Pickling of a strip is carried out by continuously passing the strip through a pickling tank. Since sludge accumulates in the pickling tank, the pickling operation is stopped and the inside of the pickling tank is cleaned when the sludge may come into contact with the strip. Generally, the cleaning method is performed by inserting a vacuum hose into the pickling tank using a vacuum suction wheel and manually intervening. In this cleaning method, the operation is interrupted and the sludge is solidified by cooling the pickling tank, which makes cleaning extremely difficult. In addition, it took a lot of labor and a lot of time in a bad environment.

As an alternative technology, Japanese Patent Publication No. 2-1087
According to the publication No. 4, the strip 102 as shown in FIG.
A scraper 103 is provided in the pickling tank 101 for treating the sludge, and the sludge 1 is moved by the reciprocating scraper 103.
A method is disclosed in which 04 is scraped against the bits 105 at both ends of the pickling tank 101, overflows into the gutter 108, is withdrawn to the settling tank 109, and is separated here. In this technique, both ends of the pickling tank must be significantly modified in order to install a device for extracting the sludge 104.
Therefore, it requires a high cost and has a defect that the line is idle for a long time.

[0004]

However, in vacuum suction by human power, hard work and operation interruption are problems, and in the scraper system of Japanese Patent Publication No. 10874/1990, a large amount of cost is required due to a large modification of the pickling tank. The problem is that it requires long line breaks. The present invention is a device that automatically discharges sludge from a pickling tank without impairing operation, and directly sucks sludge in the pickling tank as an alternative to a conventional reciprocating scraper. The purpose is to provide a scheme.

[0005]

The present invention focuses on the fact that the sludge accumulated in the pickling tank during operation is relatively soft and highly floating, and suction is extremely effective. It was developed based on the knowledge of. The present invention is characterized by taking the following technical means in a pickling tank for strips. (A) A traveling device that travels along the longitudinal direction of the pickling tank is provided above the pickling tank. (B) A sludge suction pipe is hung from the traveling device in the pickling tank. The sludge suction pipe is suspended near both side plates of the pickling tank so as not to hinder the running of the strip. (C) A suction nozzle having a slit-shaped downward opening is attached to the sludge suction pipe so as to be close to the bottom surface of the pickling tank and traverse the pickling tank. The suction nozzle is provided below the strip passing through the pickling tank and close to the bottom of the pickling tank. (D) A discharge passage for discharging sludge is provided in parallel on the side surface in the longitudinal direction of the pickling tank.

[0006]

According to the present invention, a traveling device that travels in the longitudinal direction of the pickling tank, a sludge suction pipe, a suction nozzle, and a sludge discharge passage are provided in a space that does not hinder the travel of the strip, and a pump is provided for the bottom of the pickling tank. Automatically sucks and discharges sludge during operation. Therefore, not only the amount of sludge in the pickling tank is constantly kept to a minimum, the operation of the pickling tank is not stopped and human labor is not required, but it is also suitable in terms of safety and working environment.

As the sludge discharge path, it is preferable to use a highly flexible hose to transport the sludge in the form of slurry to the processing device. For suctioning and discharging sludge, a pump may be provided outside the pickling tank. A vacuum pump may be used as the pump.

[0008]

1 to 3 show an apparatus according to an embodiment of the present invention. 1 is a partial plan view of the pickling tank, FIG. 2 is a side view thereof, and FIG. 3 is a front view thereof. Rails 2, 2 are provided on the upper surface of the pickling tank 1 on both sides of the pickling tank along the longitudinal direction of the pickling tank. Traveling devices 3 and 3 that travel along the rails 2 and 2 are provided.
The traveling devices 3, 3 include wheels 4, 4 driven by traveling motors 5, 5. The left and right traveling devices 3 and 3 are connected by the lateral beams 7 and 7 so that they travel integrally. Horizontal beam 7
The tie connecting material 6 is suspended in the pickling tank 1, and a suction pipe 9 is attached to the connecting material 6 and is suspended in the tank. A suction nozzle 10 is attached to the lower end of the suction pipe 9. The suction nozzle 10 has a slit-shaped downward opening having a length substantially equal to the inner width of the pickling tank, and is mounted close to the bottom surface of the pickling tank and orthogonal to the longitudinal direction of the pickling tank. Suction nozzle 1
As shown in FIG. 5, the skirt 0 has a skirt 10a that guides sludge to the nozzle opening and is attached downward. The suction nozzle 10 is provided below the strip 60 passing through the pickling tank and close to the bottom surface of the pickling tank 1, and sucks the sludge to be deposited together with the liquid.

Holding a skirt 10a as shown in FIG.
Moving the suction nozzle 10 with a slit width of 3 to 8 mm at a moving speed of 2 m
The best condition for suction when moving at a speed of / min was a nozzle structure with a suction speed of 0.3 to 0.8 m / s. The nozzle width may be slightly smaller than the inner width of the pickling tank. An appropriate suction flow rate of such a suction nozzle is, for example, about 280 liter / min when the inner width of the pickling tank is 2200 mm.

The pump 11 sucks the sludge in a slurry state through the suction pipe 9 and discharges it through the loop hose 13. The loop hose 13 is a flexible hose.
One end is attached to the frame 12 extending outward from the traveling device 3 and placed on the floor along the longitudinal side surface of the pickling tank. Then, it is bent so as to have one U-shaped loop. Therefore, when the traveling device 3 moves, the hose placed on the floor rises in the U-shaped loop portion and follows the movement of the traveling device. This hose has corrosion resistance,
A bellows-shaped rubber hose, a plastic hose or the like can be used.

FIG. 4 shows another embodiment of the present invention.
As shown in FIG. 4, a suction pump is mounted on the traveling carriage,
The discharge gutter 20 is installed along the longitudinal direction of the pickling tank, and the discharge gutter 20 is passed through the discharge pipe 15 fixed to the pump.
The sludge may be discharged to a waste liquid 21.

[0012]

EFFECTS OF THE INVENTION Since the present invention is a system in which sludge is directly sucked from the bottom of the pickling tank, no special equipment such as a scraper is provided in the tank, so that extra trouble such as damage, deterioration, and clogging is prevented. Has nothing to do with Of course, there is an advantage that a large amount of cost for installing the device in the tank and long-term operation suspension are not required. Generally, it is difficult to select the material of the loop hose depending on the liquid conditions in the pickling tank using mixed acid, but it can be said to be an extremely effective means in the sulfuric acid tank and the like.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a front view of FIG.

FIG. 4 is an explanatory diagram of another embodiment of the present invention.

FIG. 5 is a cross-sectional view of a suction nozzle.

FIG. 6 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

1 pickling tank 2 rail 3 traveling device 4 wheels 5 traveling motor 6 connecting material 7 lateral beam 9 suction pipe 10 suction nozzle 11 pump 12 frame 13 loop hose 15 discharge pipe 20 discharge gutter 21 waste liquid 50 dipping roll 60 strip

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Nemoto 1 Kawasaki-cho, Chuo-ku, Chiba Kawasaki Steel Co., Ltd. Chiba Steel Works (72) Masahiko Ito 1 Kawasaki-cho, Chuo-ku, Chiba Kawasaki Steel Co., Ltd. Chiba Steel (72) Inventor Takeki Sasaka 2-1, Oiwake, Hiratsuka-shi, Kanagawa Yokohama Rubber Co., Ltd. Hiratsuka Factory

Claims (1)

[Claims] 1. A strip pickling tank, wherein a traveling device that travels in a longitudinal direction of the pickling tank is provided above the pickling tank, and a sludge suction pipe is hung from the traveling device into the pickling tank to suck the sludge. A suction nozzle with a downward slit-like opening was attached to the pipe so as to be close to the bottom of the pickling tank and across the pickling tank, and a discharge path for sludge discharge was installed side by side along the longitudinal direction of the pickling tank. A pickling tank.