JPH0448100A - cleaning equipment - Google Patents

Abstract

PURPOSE:To prevent defective glossiness from being caused on the surface of strip by spirally notching a dewatering groove on the surface of a roll in the bleacher of strip. CONSTITUTION:Strip 3 is passed through a welding machine 5 and successively washed in an electrolytic washing part 7, a brushing washing part 10 and a bleacher 17 and dried by a dryer 18. At this time, the drum part 31 of a sink roll 16 in the bleacher 17 is constituted of an inner cylinder 32 and rubber lining 33. A spiral dewatering groove 35 is notched on the surface of the rubber lining 33. This spiral dewatering groove 35 is slightly tilted in the direction close to parallel in the advancing direction of strip 3. Thereby defective glossiness is prevented from being caused on strip 3 after tempering and rolling.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to equipment for cleaning metal strips such as steel, and which does not cause gloss spots to appear on the surface of metal strips such as steel. be.

[Prior Art] For example, when a metal strip such as steel is cold rolled, friction occurs between it and the rolling roll of a rolling mill, and the running speed of the metal strip on the exit side becomes faster than the running speed of the lip. The ratio of the entry speed to the exit speed corresponds to the low rate of metal strip in cold rolling. By forming an oil film of rolling oil on the rolling surface between the metal strip and the rolling orifice, the surface of the rolling roll and the metal strip are
Although surface gouging on the surface of the roll is prevented, a small amount of metal powder is generated on the friction surface between the metal strip and the rolling roll. The two gold powders generated here are suspended in rolling oil. Most of this suspended metal powder is captured as scum from the rolling oil, but a portion of it adheres to the surface of the metal strip and is wound into a coil on the tension reel at the exit of the cold rolling mill.

In equipment for electrolytically cleaning cold-rolled metal strips such as steel, metal powder and rolling oil adhering to the surface of the metal strips are cleaned and removed. ! In the decleaning equipment, the chemical action of alkali, the surface activation action of electrolysis, the blanching action, and the washing action of water wash and remove attached metal powder and rolling oil.

Drainage grooves are cut into the surface around which the strip of zinc roll is wound, which is installed in the water of the equipment for rinsing after the alkaline cleaning equipment for electrolytic cleaning of metal strips. This prevents mistracking caused by the metal strip skidding while traveling at high speed.

The conventional technology will be explained below. Figures 3, 4, and 5 show the main parts of a zinc roll with drainage grooves used in the prior art. Figure 3 is the roll body, and the strip is wound around it as shown in the figure. Drainage grooves are cut into the surface of the roll parallel to the direction in which the strip travels. When viewed from the roll body and roll axis direction, as shown in Figure 4, it has a cylindrical shape made of steel plate.

A shaft portion is attached to both end faces of this cylinder made of steel plate to form a zinc roll. A rubber lining is applied to the surface of this cylindrical roll made of steel sheet to improve strip grip properties. Drainage grooves are cut into the surface of the rubber lining parallel to the direction of travel of the strip. FIG. 5 shows the cross-sectional shape of the drainage grooves on the surface of the rubber lining. This drainage groove prevents the metal strip from mistracking due to skidding while traveling at high speed.

When the line is stopped or running at low speed during an electrolytic cleaning operation, the surface of the strip becomes oxidized in the rinse tank. According to the draining grooves of zinc rolls in the prior art, oxidation of the surface of the strip occurs at locations where water is transferred to the surface of the strip. When a strip whose surface is oxidized in this state is subjected to skin pass rolling in a temper rolling mill, if the surface of the strip is oxidized in this state, oxides such as iron oxide will be transferred to the work roll of the temper rolling mill. Deposited. As a result, differences in surface roughness occur in stripes on the work rolls of the temper rolling mill. Therefore, differences in surface roughness are transferred to the surface of the skin-pass rolled strip over the entire length.

This results in a gloss defect in the form of linear stripes over the entire length of the strip.

[Problems to be Solved by the Invention] However, the linear streak-like gloss defects on the surface of the strip result in uneven gloss when used as a base plate for high-grade tin plated steel sheets such as tinplate, and also for home appliances and luxury passenger cars. Even when an extremely uniform electrophoretic coating is applied, uneven gloss occurs, so there was a desire to provide a zinc roll for use in water rinsing of electrolytic cleaning equipment that would not cause gloss defects in the form of linear stripes on the surface of the strip.

[Means for Solving the Problems] The cleaning device according to the present invention has a draining groove spirally cut into the surface of a roll disposed in or near the tank for hot water washing or cold washing after various types of washing. It is characterized by the fact that it has a .

[Function] In the cleaning device equipped with a zinc roll having drain grooves according to the present invention, since the drain grooves are cut in a spiral shape, oxides such as iron oxide are not transferred to the work roll of a temper rolling mill. As a result, there is no difference in surface roughness in the form of stripes on the work roll of the skin-pass rolling mill, so that there is no gloss defect in the form of linear stripes on the surface of the strip.

This cleaning device is used not only for electrolytic cleaning, but also for acid cleaning, alkaline cleaning, water washing, hot water washing, etc., by cutting spiral drainage grooves into the surface of the rolls placed in or close to the final liquid cleaning tank. Therefore, it has similar effects.

In other words, it is also effective for squeezing rolls, pinch rolls, etc. that are used with liquid remaining, and includes cleaning devices applied to these rolls.

[Example] The present invention will be explained below with reference to the drawings. FIG. 1 is a layout diagram of electrolytic cleaning equipment in which the present invention is implemented. In FIG. 0, 1 is a payoff reel.

2 is an input strip coil. 3 is a strip. 4 is a pass line roll. 5 is a welding machine.

6 and 8 are electrolytic cleaning section conductor rolls. 7 is an electrolytic cleaning section. 9 is an electrolytic cleaning section deflector roll. 10 is a brushing cleaning section. 11 and 15
is the deflector roll of the brushing cleaning section. 12
is a brush roll. 13 brushing backup roll. 16 is a hot water washing tank zinc roll. 1
7 is a hot water washing tank. 18 is a dryer. 19 and 2
0 is a part of the dryer deflector roll. 21 is a deflector roll. 22 and 23 are exit side priddle rolls. 24 is an output strip coil.

25 is a tension reel.

The incoming strip coil 2 is unwound and fed out by a payoff reel 1 and connected to the tail end of the preceding strip by a welder 5. The trailing strip 3 connected to the leading strip wraps around the pass line roll 4 and enters the electrolytic cleaning section 7 while forming an accurate pass line, wraps around the electrolytic cleaning section conductor rolls 6 and 8, and then enters the electrolytic cleaning section. By being wrapped around the deflector rolls 8 and 9, it is immersed in an electrolytic cleaning solution and cleaned.

The strip 3 then passes through the brushing washing section 10 by being wrapped around deflector rolls 11 and 15, during which time the strip 3 is cleaned by brushing.Then the strip 3 enters a hot water washing tank 17 and is washed with hot water. However, at this time, it is wrapped around the hot water washing tank zinc roll 16 and immersed in hot water to be washed.

Here, the hot water washing tank zinc roll 16 is a zinc roll having a water draining structure according to the present invention.

Fig. 2 shows a zinc roll having a draining pickle according to the present invention. In Fig. 0, 31 is the body of the zinc roll;
It consists of an inner cylinder 32 which is a cylinder made of steel plate and a rubber lining 33 applied to its surface. A shaft portion 34 is attached to both end faces of the body portion 31 to form a zinc roll. The rubber lining on the roll surface enhances the quality of the strip grip. A colander is cut into the surface of the rubber lining in a spiral shape that is nearly parallel to the direction of travel of the strip but slightly oblique. 35 is a drainage groove on the surface of the roll. The cross-sectional shape of the drain groove on this surface is as shown in FIG. 5 described above.

This drainage groove prevents the metal strip from skidding and mistracking while running at high speed, and furthermore, the drainage groove is cut in a spiral pattern.

The oxidation of the surface of the strip that occurs at the locations where water is transferred to the surface of the strip due to the removal of water from the zinc roll is
It is possible to avoid the occurrence of striped differences in surface roughness on the work roll of the temper rolling mill, which are transferred and deposited on the work roll of the temper rolling mill.

Therefore, the difference in surface roughness is not transferred to the surface of the skin-pass rolled strip in a striped manner over the entire length of the strip, thereby preventing gloss defects in the form of linear stripes over the entire length of the strip.

In the embodiment shown in FIG. 2, the direction of the spiral is changed approximately at the center of the body to improve the draining effect and tracking performance. Furthermore, when multiple zinc rolls are used in one electrolytic cleaning equipment, it is possible to alternately reverse the spiral inclination direction of the draining ridges cut in the spiral shape of the zinc roll, or to make them in the same direction. The effect of preventing linear striped gloss defects from occurring on the surface of the strip is remarkable compared to the case of the conventional method.

Furthermore, in the case of a plurality of rolls, the same effect may be obtained by changing the spiral angle for each roll or alternately.

The oxidation marks in the drain grooves of the zinc rolls do not cause defects in the gloss of the strip after skin-pass rolling, and in the conventional case, the work rolls of the skin-pass rolling mill had to be rearranged only 3.9 sets/20 days after skin-pass rolling due to poor gloss. What used to be 100 tons has now disappeared. Furthermore, the incidence of failed coils due to poor gloss has been reduced from 1.3% in the conventional case.

[Effects of the Invention] Since the present invention is configured as described above, there is no occurrence of gloss defects in the strip after skin-pass rolling due to oxidation marks from the draining material of the rolls, the product yield is improved, and the skin-pass rolling machine is improved. The amount of recombined grass on the work roll of the mill has decreased, making it possible to lower the level of the original grass on the work roll of the temper rolling mill.

[Brief explanation of drawings]

Fig. 1 is an equipment layout diagram of an electrolytic cleaning equipment in which the present invention is implemented, Fig. 2 is a zinc roll according to the present invention, Fig. 3 is an explanatory diagram of a conventional zinc roll viewed from the direction perpendicular to the roll axis; FIG. 4 is an explanatory diagram of a roll body according to the prior art viewed from the roll axis direction, and FIG. 5 is a sectional view of a drainage groove on the surface of a rubber lining according to the prior art. Topeio reel, 2... Input side strip coil, 3
... Strip, 4... Pass line roll 5... Welding machine, 6.8... Conductor roll 7... Electrolytic cleaning section,
9...Deflector roll, 10...Brushing cleaning section, 11...Deflector roll, 12...Brush roll, 13.14...Brushing backup roll, 15...Deflector roll, 16...Zin roll , 17...Hot water washing tank, 18...Dryer, 1, 2o, 2]・Deflector roll, 22.23・Pride roll, 24...Strip coil, 24...
Tension reel, 31... body, 32... inner cylinder,
33...Rubber lining, 34...Shaft part, 35...
Water cutter.

Claims (1)

[Claims] A cleaning equipment characterized by having drain grooves spirally cut into the surface of a roll placed in or close to a bath for hot water or cold washing after various types of cleaning.