JPH0736924B2 - Method and apparatus for removing scale of steel material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method and apparatus for removing scale of a steel material, which removes an oxide film, that is, scale, adhering to the surface of a linear or strip-shaped steel material, and particularly uses an electrode roller. The present invention relates to a method and an apparatus for removing scale of a steel material, in which a current is passed through a linear or strip-shaped steel material passing through an electrolytic solution to electrolyze the electrolytic solution to remove the scale of the steel material by so-called electrolytic pickling.

[Conventional technology]

BACKGROUND ART Conventionally, as a method for removing scale of a steel material by electrolytic pickling, a method using an electrode roller as an electrode for passing an electric current through the steel material is known. This method is based on Japanese Patent Publication No. 55-4184.
As described in No. 4, a pair of rollers are arranged outside the electrolytic cell filled with the neutral electrolytic solution with the steel material guided in the electrolytic cell interposed, and one of the rollers has a positive electrode and a negative electrode of a DC power source. One of them is connected to form an electrode roller, and a non-contact type electrode plate is arranged in the electrolytic cell, and the other of the positive electrode and the negative electrode is connected thereto. When these electrodes are energized, a current flows through the steel material via the electrolytic solution between the steel material and the electrode plate, the electrolytic solution between the steel material and the electrode plate is electrolyzed, and the scale of the steel material is removed. Since the electrolytic solution is neutral, it is relatively easy to handle.

In addition, in the above-mentioned Japanese Patent Laid-Open Publication No. Sho, further, a mechanical scale removing device is installed on the upstream side of the electrolysis cell, and two electrolysis cells, an anode reaction cell and a cathode reaction cell, are arranged as electrolysis cells to form a compound with scale. To improve the efficiency of scale removal.

[Problems to be solved by the invention]

In the above-mentioned conventional technique, the electrode roller for supplying an electric current to the steel material sandwiches the steel material with a pair of rollers, and one of them serves as the electrode roller, so that the steel material and the electrode roller are in line contact with each other. A slight slip occurs between the steel material and the electrode roller. For this reason, the steel material and the electrode roller are repeatedly contacted and separated, and a spark is generated between them. As a result, it will damage the steel product,
There is a problem that not only the quality of the product is deteriorated, but also it is similar to scrap, which deteriorates the product yield.

Further, a slip occurs between the steel material and the electrode roller to generate wear powder, and the wear powder adheres to the surface of the steel material and the surface of the electrode roller. As a result, sparks are generated on the inlet side and the outlet side of the electrode roller using the abrasion powder as a medium, further promoting the scratching of the steel material. Further, the abrasion powder adhering to the surface of the steel material itself deteriorates the quality of the product and causes a reduction in product yield.

Therefore, an object of the present invention is to prevent the generation of sparks and abrasion powder between the steel material and the electrode roller in a steel material scale removing method and apparatus for removing the scale of the steel material by electrolytic pickling using an electrode roller, It is to improve quality and yield.

[Means for solving problems]

The above-mentioned object is, in the scale removing method of the steel material, while changing the direction of the steel material around the electrode roller so as to have a contact angle between the steel material and the electrode roller, the electrode roller has a contact angle within the range of the contact angle. Is achieved by energizing in a small angle range.

Further, the above-mentioned object is, in the scale removing apparatus for steel materials, at least one of the upstream side and the downstream side of the electrode roller is provided with guide means for changing the direction of the steel material around the electrode roller, and the electrode roller is provided with an insulating rigid body, It is composed of a plurality of strip-shaped conductors mounted on the outer peripheral surface of the rigid body separately in the circumferential direction, and is smaller than the contact angle within the range of the contact angle between the steel material and the electrode roller at one end of the electrode roller. This is achieved by providing a brush mechanism that energizes the strip-shaped conductor within the angular range.

[Action]

The steel material that turns around the electrode roller makes surface contact with the electrode roller, almost no slip occurs, and the entire surface of the steel material does not separate from the electrode roller. Further, because of the surface contact, the energization area between the steel material and the electrode roller is widened, the current density flowing therethrough is reduced, and the potential difference is reduced. Therefore, the occurrence of sparks between the steel material and the electrode roller is suppressed. Further, since the slip does not occur, almost no wear powder is generated, and sparks are suppressed from being generated on the inlet side and the output side of the electrode roller due to the wear powder. Further, since the electrode roller is energized within the range of the contact angle in an angle range smaller than the contact angle, when the steel material strip contacts the electrode roller and when the steel material strip separates at the exit side, The occurrence of sparks in parts is also prevented.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 represents the entire scale removing apparatus for steel products according to the present invention, and the scale of a strip-shaped steel product, that is, a steel product strip S is removed by this removal device 1.

The removing device 1 includes an electrolytic bath 2 filled with a neutral electrolytic solution L, and a steel material strip S is provided on the inlet side and the outlet side of the electrolytic bath 2.
, And the sink rollers 5, 6, 7, 8 for immersing the steel strip S in the electrolytic solution L are arranged in the electrolytic bath 2. In the electrolytic cell 2, there are also non-contact electrode plates 9a, 9b and 10 immersed in the electrolytic solution L.
Electrode rollers 11 located outside a, 10b and the electrolytic solution L are arranged. A power supply unit 12 is provided on the electrode plates 9a, 9b and 10a, 10b.
Is connected to the cathode, and the electrode roller 11 is connected to the anode.

The sink rollers 6 and 7 located below the electrode roller 11 constitute guide means for changing the direction of the steel strip S around the electrode roller 11 by the arrangement of the anode roller 11 and the sink rollers 6 and 7. There is. As a result, the steel strip S makes surface contact with the electrode roller 11 at a predetermined contact angle. In the illustrated embodiment, the contact angle is approximately 180 degrees.

As shown in FIG. 2, the electrode roller 11 has a roller core 20.
And an insulating body 21 that is press-fitted into the roller core 20.
And a plurality of strip-shaped conductors 22 separately mounted in the circumferential direction on the outer peripheral surface of the insulating body 21. More specifically, a plurality of dovetail grooves 23 are formed on the outer peripheral surface of the insulating body 21 in the axial direction, and a plurality of strip-shaped conductors 22 are inserted into these dovetail grooves 23.

At both ends of the roller core 20, rotary shafts 24, 25 extending through the side walls 2a, 2b of the electrolytic cell 2 are provided.
Is rotatably supported by bearing devices 26 and 27 outside the electrolytic cell 2. One of the strip-shaped conductors 22 is extended to the end of the rotary shaft 24 to form an extension 28, and the extension 28 is located on the rotary shaft 24 via an insulator 29.

A brush mechanism 30 is arranged at one end of the electrode roller 11. As shown in FIG. 4, the brush mechanism 30 includes two rows of brushes 31a, 31b and brushes 32a, 3b which come into contact with the conductor extension 28 within the range of the contact angle between the steel strip S and the electrode roller 11.
2b, 32c, the inner brush 31a, 31b is the outer brush 32
It is located so as to fill the gap between a, 32b and 32c. The brushes 31a, 31b, 32a, 32b, 32c are accommodated in the corresponding holes 34, 35 of the holder 33 attached to the bearing device 26, and the conductors are also provided by the spring rings 36, 37 also accommodated in the holes 34, 35. Biased towards extension 28. As a result, the brush mechanism 30 energizes the belt-shaped conductor 22 within the range of the contact angle between the steel strip S and the electrode roller 11 and within the range of the angle smaller than the contact angle.

A shield plate is provided between the side walls 2a, 2b of the electrolytic cell 2 and the rotating shafts 24, 25.
It is closed by 38, 39.

As shown in FIG. 5, roller type scrapers 40 and 41 are provided between the electrode roller 11 and the sink roller 6 as drainers for removing the electrolytic solution adhering to the steel strip S. The scrapers 40 and 41 have roller wipers 42 as shown in FIG. 6 and FIG.
43 (only one shown) is supported by a bearing 44, and a stopper that is inserted into a hole 45 formed in the bearing 44 at the end of the rotary shaft 43.
46 is installed. This allows the roller wiper 42
Can be arbitrarily selected from a rotary type and a fixed type.

Next to the bearing 44, a centering adjustment bolt 45 that is orthogonal to the axis of the rotary shaft 43 and engages with the bearing 44 is provided. By operating this adjustment bolt 45, the offset amount of the bearing 44 is adjusted, and the steel strip S The contact strength of the roller wiper 42 with respect to is adjusted.

The operation of the scraper removing device 1 configured as described above will be described below.

The steel strip S is introduced into the electrolytic bath 2 by the deflora 3, immersed in the electrolytic solution L by the sink roller 5, and guided upward between the electrode plates 9a and 9b and through the sink roller 6 to remove the electrolytic solution L. It is once put out. Then, the direction is changed around the electrode roller outside the electrolytic solution L, and the sink roller 7
Is guided downwardly by the electrolytic solution L, is immersed again in the electrolytic solution L, passes between the electrode plates 10a and 10b and the sink roller 8, and is led out of the electrolytic cell 2 by the deflora 4.

As described above, the cathode of the power supply device 12 is connected to the electrode plates 9a, 9b and 10a, 10b in the electrolytic solution, and the anode is connected to the electrode roller 11. As a result, the steel strip S moving in the electrolytic bath 2 is connected between the electrode strips 9a, 9b and the electrode roller 11 via the electrolytic solution L between the steel strip S and the electrode strips 9a, 9b and 10a, 10b. Part, the electrode roller 11 and the electrode plates 10a, 10
An electric current flows in the portion between b and the electrolytic solution L between the steel strip S and the electrode plates 9a, 9b and 10a, 10b is electrolyzed, and the scale of the steel strip S is removed by this electrolysis.

On the other hand, at this time, in the electrode roller 11, the steel strip S makes a surface contact at an angle of approximately 180 degrees and turns around the periphery thereof. Therefore, the steel strip S and the electrode roller
Sufficient frictional force acts on 11 and slip hardly occurs. The entire surface of the steel strip is electrode roller 11
Never leave. Further, because of the surface contact, the current-carrying area between the steel strip S and the electrode roller 11 becomes large, the current density flowing therethrough becomes small, and the potential difference becomes small.
For this reason, the steel strip S and the electrode roller 11
A spark is prevented from occurring between and.

Further, since slip does not occur between the steel strip S and the electrode roller 11, almost no wear powder is generated, and sparks are suppressed from being generated on the inlet side and the output side of the electrode roller 11 due to the wear powder.

The brush mechanism 30 includes a steel strip S and an electrode roller 11
Within the range of the contact angle with, the belt-shaped conductor 22 within the angle range smaller than the contact angle is energized. Therefore, when the steel strip S contacts the electrode roller on the inlet side of the electrode roller 11 and when the steel strip S separates on the outlet side, no current flows in that portion, and it is possible to avoid sparking in that portion.

As described above, since no spark is generated between the electrode roller 11 and the steel strip S, the steel strip S is prevented from being damaged by the spark. Further, since no abrasion powder is generated, the abrasion powder does not adhere to the steel strip S. Therefore, the quality of the product is improved and the yield is also improved.

Further, when the electrode roller is energized in this manner, the electrolytic solution L attached to the steel strip S is removed by the scrapers 41, 41 between the sink roller 6 and the electrode roller 11. This minimizes the invasion of the electrolytic solution into the electrode roller 11, and the electrolytic solution causes the electrode roller 11, particularly the strip-shaped conductor 22
Is less likely to corrode.

Since the electrode roller 11 has a configuration in which the strip-shaped conductor 22 is attached to the insulating body 21 by the dovetail groove 23, the body 22 can be easily attached and detached. Therefore, even if the conductor 22 is corroded, the conductor 22 can be easily replaced and the electrode roller can be easily maintained.

In the above embodiment, the steel strip S was turned around the electrode roller 11 so that the contact angle was about 180 degrees. However, as long as surface contact is made, angles other than 180 degrees and angles other than 180 degrees are used. It may be redirected to contact at an angle.

In addition, a sink roller is provided on both upstream and downstream sides of the electrode roller 11.
Although 6 and 7 are arranged and electrolytic pickling is performed at two places, a sink roller may be arranged only on one side and electrolytic pickling may be performed at one place. In this case, the electrode roller 11 can be arranged on either the inlet side or the outlet side of the electrolytic pickling portion.

〔The invention's effect〕

As is apparent from the above, in the steel material scale removing method and apparatus of the present invention, the contact angle is provided between the steel material and the electrode roller, and the electrode roller has an angle range smaller than the contact angle within the contact angle range. Since it is energized with, no sparks are generated and no wear powder is generated.
It is possible to prevent damage to the steel material due to sparks and adhesion of wear powder to the steel material, improve product quality and yield, and realize a significant cost reduction of the product.

[Brief description of drawings]

FIG. 1 is a schematic view showing the layout of a steel material scale removing device according to an embodiment of the present invention, FIG. 2 is a partial cross-sectional side view of an electrode roller of the scale removing device, and FIG. 3 is the same electrode. FIG. 4 is a cross-sectional view of the upper part of the roller, FIG. 4 is an explanatory view showing the positional relationship between the conductor extension of the electrode roller and the brush of the brush mechanism, and FIG. 6 is an enlarged view of the portion of the sink roller of FIG. 6, FIG. 6 is an end view of the scraper shown in FIG. 5, and FIG. 7 is a side view of the end of the scraper. In the figure, reference numeral 1 ... Scale removing device, 2 ... Electrolyzer, 6,
7 …… Sink roller (guide means), 11 …… Electrode roller, 2
1 ... Insulating body, 22 ... Strip conductor, 23 ... Dovetail, 30
…… Brush mechanism, 41,42 …… Scraper

Claims (4)

[Claims] 1. A method for removing scale of a steel material, which comprises applying an electric current to a linear or strip-shaped steel material passing through an electrolytic solution using an electrode roller to remove the scale of the steel material, wherein the steel material is turned around the electrode roller, A method of removing scales of a steel material, comprising providing a contact angle between the steel material and an electrode roller, and energizing the electrode roller within an angle range smaller than the contact angle within the range of the contact angle. 2. A steel material scale removing device for removing a scale of a steel material by applying an electric current to a linear or strip-shaped steel material passing through an electrolytic solution by using an electrode roller, and at least one side upstream and downstream of the electrode roller. A guide means for diverting the steel material around the electrode roller is arranged, and the electrode roller is provided with an insulating rigid body and a plurality of strip-shaped conductors circumferentially separated and attached to the outer peripheral surface of the rigid body. And a brush mechanism for energizing a belt-shaped conductor within an angle range smaller than the contact angle between the steel member and the electrode roller at one end of the electrode roller. Scale remover. 3. A plurality of dovetail grooves extending in the axial direction are formed on the outer peripheral surface of the insulating rigid body, and the strip-shaped conductors are inserted and mounted in the dovetail grooves. The scale remover for steel according to the item. 4. The scale removing device for steel products according to claim 2, further comprising a scraper for removing the electrolytic solution adhering to the steel products upstream of the electrode roller.