JPH06114419A - Device for trimming roll surface of rolling mill - Google Patents

Abstract

PURPOSE:To eliminate the need for attachment and detachment of a doctor blade and gap adjustment at every exchange of rolls. CONSTITUTION:This device is a roll surface trimming device for removing attached foreign matters by abutting a doctor blade 43 on the surface of a roll 2 of a rolling mill. It is mounted on a cobble guard 3 in the rolling mill, both ends of the doctor blade 43 are supported by supporting member 41 connected with an adjusting cylinder 44 to adjust a gap to the roll surface and consists of a gas nozzle 51 for injecting pressure gas toward a wedge shape space composed of the roll surface and the doctor blade and a controller 53 for controlling an adjusting cylinder 44 through this back pressure to adjust the gap.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a doctor blade type roll surface cleaning device for removing foreign matter adhering to the roll surface of a rolling mill in cold rolling of a metal strip such as a steel strip.

[0002]

2. Description of the Related Art In cold rolling of steel strips, stainless steel strips, metal strips such as aluminum (hereinafter referred to as "steel strips"), if foreign matter adheres to the roll surface, a backup roll and a work roll mesh with each other. At that time, foreign matter digs into the soft backup roll side, which is transferred to the work roll, causing surface defects on the rolled steel strip.

A mixture of rolling oil and cooling water called roll coolant, which is sprayed on the roll surface for cooling the roll and improving the rolling property, also has a function of rinsing foreign substances on the roll surface, but some foreign substances cannot be removed by this alone. is there. Therefore, as disclosed in, for example, Japanese Patent Application Laid-Open No. 4-52013, there is known a roll surface care device that gently presses a thin blade-shaped doctor blade against the roll surface to mechanically remove foreign matter.

A side sectional view of this device is shown in FIG. 1 is a steel strip, 2 is a work roll, 6 is a surface care device, 61 is a blade holder, 65 is a rotating shaft, 63 is a doctor blade, 64 is a blade retainer, and 66 is a counterweight. The doctor blade 63 is fixed to the blade holder 61 by a blade retainer 64, is rotatably supported around a rotary shaft 65, and is pressed against the roll surface by a pressing force F adjusted by its own weight W and a counterweight 66 to roll the roll. The foreign matter adhered to the surface is mechanically shaved off by the rotation of.

Conventionally, such a roll surface maintenance device is usually attached to a roll chock of a work roll to be cleaned through a bracket. In cold rolling mills, work rolls are changed relatively frequently due to quality requirements, but when the roll surface maintenance device is attached to the roll chock of the work roll, the roll surface maintenance device is newly incorporated into the roll chock by roll exchange. Had to be installed in advance to adjust the gap between the doctor blade and the roll, while the work for removing the roll surface care device from the removed roll chock was required.

Further, the adjustment of the gap between the doctor blade and the roll depends on the operator's perception and experience, and therefore there are individual differences in the method and finish, and it takes a long time, and in some cases during adjustment. There are also problems such as accidentally scratching the roll.

[0007]

SUMMARY OF THE INVENTION The present invention provides a novel mounting structure for a roll surface care device and a means for adjusting a gap, which eliminates such trouble and eliminates the need to remove and install the work roll each time the work roll is replaced. The purpose is to

[0008]

SUMMARY OF THE INVENTION The present invention is a roll surface care device for removing foreign matter adhering to a roll surface of a rolling mill by pressing a doctor blade, which is attached to a cobble guard in the rolling mill. The blade is characterized in that both ends thereof are supported by a supporting member connected to an adjusting means for adjusting the distance from the roll surface.

Further, the present invention further includes a gas nozzle for ejecting a pressure gas toward a wedge-shaped space formed by a roll surface of a rolling mill and a doctor blade, and adjusting means based on a pressure signal detected by the gas nozzle. And a control device for controlling the.

[0010]

[Operation] According to the present invention, the roll surface care device is attached not to the work roll chock but to the cobble guard in the rolling mill. Therefore, it is not necessary to remove and attach the doctor blade every time the work roll is replaced. Furthermore, a pressure sensor that measures the gap between the doctor blade and the roll and a cylinder that moves the doctor blade toward or away from the roll surface are installed, and this cylinder is controlled by a signal from the pressure sensor to interlock them. Therefore, the adjustment of the gap is not performed when the doctor blade is attached, but can be performed in real time while being used while measuring the gap with the sensor, so that the maintenance function is always maintained in a good state. Also,
Even if rolls having different roll diameters are incorporated by exchanging rolls, it is not necessary to perform adjustment work for that purpose.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to FIGS. 1 is a side view of the roll surface care device,
FIG. 2 is a plan view taken along the line AA. Reference numeral 1 is a steel strip, 2 is a work roll, 3 is a cobble guard, 4 is a surface care device of this embodiment, and 51 is a gas nozzle described later. By the way, the cobble guard 3 is a partition plate provided outside the work roll so as not to come into contact with the work roll, and prevents the steel strip from being wound around the work roll or the backup roll in the case of rolling trouble such as breakage. To do. Since it becomes an obstacle when changing the rolls, it is necessary to evacuate the housing from the window and return to the original position after incorporating the rolls.

As shown in this figure, the roll surface care device 4 of the present invention is attached to the cobble guard 3. Figure 3
FIG. 3A is an enlarged side view of the roll surface care device, FIG.
4B is a sectional view taken along the line BB, and FIG. 4 is a partial plan view corresponding to FIG. 41 is a blade holder, 42 is a guide bracket, 43 is a doctor blade, 44 is an adjusting cylinder as an example of adjusting means, 45 is a rotating shaft, and 46 is a counterweight.

The blade holder 41 is fitted into two guide brackets 42 provided at both ends in the width direction of the work roll on the cobble guard, and its rear end is connected to each of two adjusting cylinders 44. The distance can be adjusted by moving in and out so that the roll surface approaches and separates. Since the doctor blade 43 is in contact with the entire width of the roll, it forms a slender strip having soft flexibility, and at the tip of the blade holder 41, through the rotating shaft 45, foreign matter on the roll surface with respect to the rotation direction of the roll. It can be mounted at an angle like picking up.

FIG. 5 is a side view of the adjusting device 5 for adjusting the distance between the roll surface and the doctor blade, and 51 is a gas nozzle,
52 is a pressure sensor, 53 is a control device, and 54 is a switching valve. At least two gas nozzles 51 for ejecting pressure gas toward a wedge-shaped space formed by the doctor blade 43 and the work roll 2 are provided on the back surface near both ends of the doctor blade 43. Since there is a gap between the doctor blade 43 and the work roll 2 and the back pressure of the ejected pressure gas is different depending on the size, this is detected by the pressure sensor 52 and provided in the fluid pressure circuit of the adjustment cylinder 44 via the control device 53. Control valve 54 and adjust cylinders 44 at both ends.
The feedback control of the gap is performed by. Gas nozzle 51
Is preferably a back pressure type air micrometer commercially available under the name such as air micrometer, but may be combined with a pressure switch or the like. In the present invention, since the environment of the installation location is bad due to steam, rolling oil, etc., an optical or electromagnetic range finder cannot be used, and the gas nozzle method is optimal.

In the present invention, the adjusting device 5 not only performs the retracting operation and the returning operation to the used state when the adjusting cylinder 44 does not use the roll surface maintenance device such as the roll exchange, but also performs the clearance adjustment in the used state. be able to.
Therefore, not only is it unnecessary to remove and install the doctor blade when exchanging the rolls, but also the clearance adjustment work performed after the installation becomes unnecessary.

[0016]

According to the present invention, a doctor blade for removing foreign matter on the roll surface is attached to a cobble guard in a rolling mill, and an adjusting cylinder for adjusting a contact gap with the roll is provided.
Since the pressure sensor that detects this gap is linked, removing the doctor blade when changing the roll,
There is no need for work such as mounting and adjustment, and since contact with the roll can be detected, it is possible to prevent scratches on the roll due to misadjustment of the doctor blade.

[Brief description of drawings]

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

FIG. 2 is a plan view taken along the line AA of FIG.

FIG. 3 is a partial side view of FIG.

FIG. 4 is a plan view of FIG.

FIG. 5 is a control system diagram of the adjusting device of the present invention.

FIG. 6 is a side view showing a conventional technique.

[Explanation of symbols]

 1 Steel strip 2 Work roll 3 Cobble guard 4 Roll surface care device 43 Doctor blade 44 Adjustment cylinder 5 Adjustment device 51 Gas nozzle 52 Pressure sensor 6 Roll surface care device 63 Doctor blade

Claims (2)

[Claims] 1. A roll surface maintenance device for pressing a doctor blade against the roll surface of a rolling mill to remove foreign matter adhering to the roll surface, which is attached to a cobble guard in the rolling mill, wherein the doctor blade is separated from the roll surface. A roll surface maintenance device for a rolling mill, characterized in that both ends are supported by a supporting member connected to an adjusting means for adjusting. 2. A gas nozzle for ejecting a pressure gas toward a wedge-shaped space formed by a roll surface of a rolling mill and a doctor blade, and a control for controlling an adjusting means by a pressure signal detected by the gas nozzle. The roll surface care device for the rolling mill according to claim 1, further comprising: