JPH0494803A - Device for removing foreign matter sticking to roll - Google Patents

Abstract

PURPOSE:To efficiently remove foreign matter sticking to a roll by spirally arranging a knife-shaped scraper which is bisected in the longitudinal direction and providing a groove for discharging foreign matter at the back of it. CONSTITUTION:In a device for removing foreign matter sticking to the outer peripheral surface of roll in a continuous processing line for metallic strip, the knife-shaped scraper 3 is bisected in the longitudinal direction, formed into spiral, arranged in the shape of sweepback wings in a helical angle and over both end parts of a roll with the region of width longer than the entire width of the metallic strip 4 by taking the middle part in the width direction of the roll 1 as an apex and brought into contact with the outer peripheral surface of roll. And, the groove 8 for discharging foreign matter is provided over the entire length of its back. In this way, the foreign matter sticking to the roll is scraped and also can be discharged without staying it.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is equipped with a knife-shaped scraper for removing foreign matter adhering to the outer peripheral surface of a roll provided in a continuous processing line for metal strips. Roll (=j) This relates to a foreign matter removal device.

<Prior art> In a continuous processing line for metal strips, such as a rolling line for rolling cold-rolled steel sheets or a plating line for plating surface-treated steel sheets, various types of deflector rolls and the like are used to convey the metal strips. A roll is placed.

In this way, it is inevitable that foreign matter will adhere to the rolls disposed within the line.

There are various types of foreign matter adhering to the roll, including those generated from the metal strip itself and those brought from the roll device, such as metal powder, dust, scale, and dirt. If foreign matter is attached to the roll, defects such as indentation scratches and star marks will occur on the surface of the metal strip being conveyed, impairing the surface quality. Furthermore, the roll itself may be scratched, resulting in a large number of defective strips. For this reason, various roll-attached foreign matter removal devices have been proposed to remove foreign matter that has adhered to the rolls.

For example, JP-A-49-38836 and JP-A-49-
No. 21361 discloses a device that removes foreign matter adhering to a roll by moving a linear knife-like scraper along the axial direction of the roll, and Japanese Utility Model Application Publication No. 133666/1986 uses a knife-like scraper to remove foreign matter from a roll while moving it along the axial direction of the roll. It has been proposed to arrange them in the width direction. However, the prior art proposed in the above-mentioned publication does not handle the foreign matter scraped off with a knife-like scraper, and the remaining foreign matter may cause damage to the surface.
This poses a problem in making the knife-shaped scraper work effectively.

Japanese Utility Model Application No. 58-111103 proposes a method for disposing of foreign matter scraped with a knife-shaped scraper by installing a suction hood immediately after the knife-shaped scraper to remove the foreign matter by suction. In order to secure the force, the suction port cannot be made wide, so the suction port of the suction hood must be narrowed and the suction port must be moved in the roll axis direction together with the knife-shaped scraper, which results in a complicated structure.

Also, Utility Model Application No. 50-26132 and Utility Model Application No. 62-10
Publication No. 3489 proposes a method in which a knife-shaped scraper is used in combination with a liquid jet nozzle, and foreign matter adhering to the roll is scraped off with the knife-shaped scraper and then washed away with the liquid jetted from the liquid jet nozzle. The places where it can be used are limited, and it often cannot be used, especially in conveyor roll systems, so it lacks versatility.

Furthermore, Japanese Utility Model Application Publication No. 2-48163 proposes a system in which a knife-shaped scraper and a gutter for storing scraped foreign matter are integrated, and the gutter slides in the roll axis direction. There are problems in that foreign matter accumulated on the cutting edge does not fall smoothly into the gutter, making removal of the foreign matter uncertain, and also requiring a sliding mechanism, resulting in a complex structure and increased equipment costs.

<Problems to be Solved by the Invention> The present invention solves the problems of the prior art as described above, uses a knife-like scraper to reliably scrape off adhered foreign matter from the outer peripheral surface of the roll, and quickly eliminates the scraped foreign matter. The object of the present invention is to provide a roll (one-piece foreign matter removal device) with a simple structure that can always keep the roll clean over its entire width and can be easily installed even in a narrow space.

Means for Solving the Problems> To achieve the above-mentioned objects, the present invention includes a knife-like scraper for removing foreign matter adhering to the outer peripheral surface of a roll provided in a continuous processing line for metal strips. The roll adhesion removal device is characterized in that the knife-shaped scraper is divided into two pieces in the longitudinal direction, each of which is formed into a spiral shape, and each of the knife-shaped scrapers is used to remove the metal from the metal with the central part in the width direction of the roll as the apex. The helical angle is arranged so as to form a swept wing-like shape in the roll rotation direction over both ends of the roll in a width region longer than the full width of the strip, and is in contact with the outer circumferential surface of the roll, and the knife-shaped scraper is provided with a blade along the entire length behind it. This is a roll-attached foreign matter removing device characterized by being provided with a foreign matter discharge groove.

<Function> As described above, the knife-shaped scraper formed in a helical shape as described above is arranged so that the helical angle is shaped like a swept wing in the direction of roll rotation, with the apex at the center in the width direction of the roll, and the helical angle extends across both ends of the roll. Since the roller is brought into contact with the outer circumferential surface, foreign matter adhering to the outer circumferential surface of the roll can be quickly and reliably scraped off by the knife-shaped scraper.

In this way, the foreign matter scraped by the knife-shaped scraper is guided to the groove installed behind the knife-shaped scraper, and is automatically removed to both ends of the roll through the groove, so the knife-shaped scraper always works stably. foreign matter can be removed.

<Example> In Fig. 1, reference numeral 1 denotes a roll installed in a cold-rolled steel plate production line, and the roll l is divided into two pieces in the longitudinal direction and has a knife-shaped scraper 2 formed in a spiral shape.
and 3 are disposed while being supported by a support frame (not shown).

That is, the two knife-shaped scrapers 2.3
The metal strips 1 are arranged in the shape of swept wings in the rotational direction of the roll 1 over both ends of the roll 1 in a width region longer than the entire width of the metal strip 4 being conveyed with the central part in the width direction as the apex, and are brought into contact with the outer circumferential surface of the roll 1. be.

As shown in FIG.
At the same time, a groove 8 for discharging foreign matter is provided behind the holder 5 of the knife-shaped scraper 2.3 over the entire length in the longitudinal direction.

As shown in FIG. 3, the helical angle θ of the knife-shaped scraper 2 (the same applies to 3) placed in contact with the roll 1 with respect to the roll axis direction is determined by the helical angle θ of the knife-shaped scraper 2 (the same applies to 3) placed in contact with the roll 1. It is necessary to set the angle so that the foreign matter is guided into the foreign matter discharge groove 8 and easily moves to both ends of the tour roll 1. The minimum angle of the helical angle θ is not uniform but varies depending on various conditions such as the surface condition of the roll 1, the properties of the attached foreign matter, the rake angle α of the knife-shaped scraper 2.3 (see FIG. 2), and its posture. Therefore, it is preferable to set the helical angle θ as large as possible in consideration of the structure so as to smoothly discharge the foreign matter.

Furthermore, the discharge end of the foreign matter discharge groove 8 provided behind the knife-shaped scrapers 2 and 3 is connected to the roll 1 as shown in FIG.
The knife-shaped scraper 2.3 is provided to make the range from the 2 o'clock position indicated by the clock scale to the 4 o'clock position indicated by the clock scale relative to the roll 1 as shown in Fig. 5. This is convenient for smoothly discharging foreign matter from the discharge end of the foreign matter discharge groove 8. If the condition that the discharge end of the groove for discharging foreign matter provided in the knife-shaped scraper 2.3 is within the range of 2 o'clock to 4 o'clock on the clock scale with respect to the roll 1 is satisfied, the total length of the knife-shaped scraper 2.3 can be set to multiple times. It is also possible to subdivide into

Four deflection rolls (roll length L = 2000 mm, diameter d = 1000 mm) were installed in a continuous electroplating line for cold rolled steel sheets (thickness 1.0 mm, width 1200 mm).
), the spiral knife-shaped scraper divided into two parts according to the present invention is set to the helical angle θ-35 degrees in FIG. 3, and the width W=
The deflector roll was placed over a length of 1800 mm to remove foreign matter adhering to the deflector roll. For comparison, a straight knife-shaped scraper is placed in the axial direction of the roll (corresponding to the helical angle θ−〇)
A comparative experiment was conducted to remove foreign substances using

Table 1 shows the effects of the inventive example and the comparative example (conventional example).

As shown in Table 1, according to the present invention, compared to the comparative example, the foreign matter adhering to the roll can be scraped off more reliably using the knife-shaped scraper, and the foreign matter is smoothly discharged without accumulation. It can be seen that the number of times of cleaning can be significantly reduced, and the occurrence of surface defects on electroplated cold rolled steel sheets due to foreign matter adhering to the rolls can be eliminated.

<Effects of the Invention> As explained above, according to the present invention, it is possible to reliably scrape off foreign matter adhering to a roll, and it is also possible to easily discharge the scraped foreign matter without stagnation, thereby eliminating the problem caused by line stoppage. Not only is it possible to improve the operating rate of the line by eliminating roll maintenance work, but also it is possible to significantly reduce quality defects in metal strips due to foreign matter adhering to the rolls.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a roll (=J foreign matter removing device) according to the present invention, Fig. 2 is a partially enlarged side view of Fig. 1, Fig. 3 is a plan view of Fig. 1, and Figs. Fig. 5 is an explanatory view showing the -1 position of the roll-attached foreign matter removing device according to the present invention. 1... Roll, 2... Knife-shaped scraper, 3... Knife-shaped scraper, 4... - Metal strip, 5... Holder, 6... Knife, 7... Bolt, 8... Foreign matter discharge groove.

Claims (1)

[Claims] A roll deposit removal device equipped with a knife-shaped scraper for removing foreign matter attached to the outer circumferential surface of a roll installed in a continuous processing line for metal strips, the knife-shaped scraper being divided into two sheets in the longitudinal direction. The metal strip is divided and each is formed into a spiral shape, and the helical angle of each knife-shaped scraper is set back in the roll rotation direction over both ends of the roll in a width region longer than the entire width of the metal strip, with the apex at the center in the width direction of the roll. A roll-adhered foreign matter removing device characterized in that the knife-shaped scraper is arranged in a wing shape and brought into contact with the outer circumferential surface of the roll, and the knife-shaped scraper is provided with a foreign matter discharge groove over the entire length behind the knife-shaped scraper.