JPH04308069A - Automatic roll grinding device - Google Patents

Abstract

PURPOSE:To automatically grind a roll and to stabilize the quality of the product by providing a mechanism for pressing a rotating brush on the roll and reciprocating the brush, etc., fixing the pressing amt. and allowing the parallel movement of the brush to follow the traveling speed of a steel strip. CONSTITUTION:This automatic roll grinding device is formed with a rotary grinder 21 for scraping off the foreign matter deposited on a roll 8, a mechanism for pressing the grinder on the roll 8, a reciprocating mechanism, a means 22 for detecting the wear of the grinder 21 and a control means 30. The grinder 21 is reciprocated along the axis of the roll 8 by the reciprocating mechanism. The pressing amt. is controlled by the control means 30 based on the result of the detecting means 22, and the speed of the grinder controlled in accordance with the traveling speed of the ground steel strip 2. The foreign matter deposited on the roll 8 is removed on-line in this way.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic roll polishing apparatus for automatically polishing rolls for transporting plated steel strips on-line.

0002

[Prior Art] For example, in a production line for hot-dip galvanized steel sheets, alloying of deposited plating is promoted in an alloying furnace, and after forced cooling, an upper deflector roller is used.
The steel strip is transported downstream by the The plating surface layer is soft immediately after alloying, and zinc tends to adhere to the upper deflector roll. If zinc adheres to the roll surface, it is undesirable because it damages the surface of the plated steel strip and causes quality deterioration.

For this reason, the surface of the upper deflector roll is coated with satin-like chrome plating or ceramic spray coating.
Prevents zinc from adhering. Despite that,
Since zinc adheres to the roll surface, the operator presses a brush against the roll surface to remove the adhered zinc. Further, a polishing device is installed near the roll, a brush is pressed against the roll surface, and adhering zinc is removed while the brush is moved back and forth along the roll axis.

0004

[Problems to be Solved by the Invention] However, in conventional roll polishing devices, the amount of brush pressing changes due to wear of the brush and changes in the crown shape of the roll, etc. is set manually, resulting in insufficient polishing or uneven polishing. Further, since the brush traveling speed in the roll axis direction is constant, if the steel strip conveying speed (roll rotation speed) changes, insufficient polishing or wasted polishing will occur.

Furthermore, when manufacturing high-quality surface-treated steel sheets, workers constantly monitor the condition of the rolls online and manually finely adjust the amount of push of the brush to grind away the adhering zinc. There is a need. For this reason, it depends on the skill level of the worker, and individual differences in quality tend to occur.

[0006] This invention was made to solve the above-mentioned problem, and the amount of brush pressing against the roll does not substantially change from the initial stage to the final stage of use, and also depends on the operator. An object of the present invention is to provide an automatic roll polishing device capable of automatically grinding a roll online without any trouble.

[0007]

[Means for Solving the Problems] An automatic roll polishing device according to the present invention is an automatic roll polishing device that removes foreign matter on-line from a roll for conveying a plated steel strip. A rotary grinding object that removes adhering foreign matter by grinding, a pressing mechanism that presses the rotary grinding object against a roll, a reciprocating mechanism that moves the rotary grinding object back and forth along a roll axis, and the rotary grinding object. means for detecting the state of wear of the rotary abrasive object, and controlling the amount of pressing of the rotary abrasive object by the pressing mechanism according to the detection result, and controlling the amount of pressing of the rotary abrasive object by the reciprocating mechanism according to the conveyance speed of the plated steel strip. It is characterized by having a control means for controlling the moving speed.

[0008]

[Function] In the automatic roll polishing device according to the present invention, the wear condition is detected from the operating time of the rotary grinding object, changes in the diameter, etc., and the amount of pressing of the rotary grinding object is appropriately adjusted accordingly. Prevents temporal fluctuations in roll surface grinding.

Furthermore, when the conveyance speed of the plated steel strip increases, the reciprocating speed of the rotary grinding object is increased, and the brush is reciprocated so as to come into contact with the roll surface at approximately the same position as in the case of low speed. Furthermore, when the width of the steel strip changes, the reciprocating stroke of the rotary grinding object changes accordingly.

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 2, in the continuous galvanized steel sheet production line, the steel strip 2 is soaked in a continuous annealing furnace (not shown) and then immersed in a hot-dip galvanizing bath 3. ing. An in-bath deflector roll 4 is provided in the plating bath 3, and the steel strip 2 is passed from the roll 4 to an upper deflector roll 8 via a drawing device 5, an alloying furnace 6, and an air cooling device 7. It is designed to be transported vertically. At the upper roll 8, the conveying direction of the steel strip 2 is changed from vertical to horizontal.

The upper deflector roll 8 is provided horizontally, and has a rotating shaft connected to a motor (not shown). A rotating brush 21 of an automatic polishing device is pressed against a proper position on the lower roll surface of the upper roll 8. The rotating brush 21 is formed by bundling many sheets of abrasive paper.

As shown in FIG. 1, a first stage 12 of an automatic polishing device 10 is supported by a pair of rails 11, and a lower nut (not shown) is attached to a screw 14 equipped with a motor 13.
are screwed together. The shaft of the screw 14 extends in a direction parallel to the rotation axis of the upper roll 8 (X-axis direction), and the first stage 12 is reciprocated in the X-axis direction by driving the motor 13. ing. Moving straw of first stage 12
The pass line is set longer than the maximum width of the steel strip 2 that should pass through the pass line.

A box 15 is provided on the table of the first stage 12, and a screw jack 18 is attached to the side surface of the box 15. A timing belt is stretched between the screw jack 18 and the drive shaft of the servo motor 17. The screw of the screw jack 18 extends in a horizontal plane in a direction perpendicular to the rotational axis of the upper roll 8 (Y-axis direction), and is connected to the second stage 19. This screw jack 18 is provided to finely adjust the amount of pushing of the rotating brush 21, and is
7 is rotationally controlled with high precision.

A pair of rotating brushes 21 are provided on the table of the second stage 19. These pair of rotating brushes 2
1 are supported by the same support shaft. A belt is stretched between the support shaft of the brush 21 and the rotating shaft of the motor 20. Further, a distance sensor 22 is attached to a suitable position on the second stage 19.

Note that the rod of the emergency evacuation cylinder 16 is connected to the box 15 on the first stage 12. This emergency evacuation cylinder 16 is a rotor of the rotating brush 21.
When an abnormality occurs in contact with the rotary brush 21
It has the role of separating the material from the roll 8.

The output side of the controller 30 is connected to a power supply circuit for each motor 13, 17, 20 and cylinder 16. On the other hand, a current detector (not shown) and a voltage detector (not shown) of the motor 13 and a distance sensor 22 are connected to the input side of the controller 30. Next, Figure 3
The case where the reciprocating movement of a rotating brush is automatically controlled online will be explained with reference to .

Setting values for setting conditions for the reciprocating stroke amount and rotational speed of the rotating brush 21 are controlled by the controller 3.
0 is pre-entered with data. These conditions are appropriately changed depending on the width of the steel strip 2 and the like.

The main roll speed command signal is sent to the controller 3.
0, the roll speed is determined, and a speed command signal is sent to the speed controller 32. The main roll speed command signal is the conveyance speed of the steel strip 2 (for example, 100 m/min)
This is a voltage signal representing the roll rotation speed that corresponds one-to-one to the roll rotation speed, and is input from another control system.

Furthermore, a signal is sent from the controller 32 to the AC variable speed device 33, and the running speed V of the rotating brush 21 is determined based on the following equation (1). However, speed V1 indicates the roll rotation speed corresponding to the main roll speed command signal, and symbols A and B each indicate a variable constant. V=A×V1 +B…(1)

[0021]
A voltage signal corresponding to the running speed V is sent from the AC variable device 33 to the motor 13 to drive the motor 13. Motor 1
3 repeats forward and reverse rotation at the desired rotation speed,
The rotating brush 21 moves back and forth at a desired speed. Incidentally, the reciprocating speed of the rotating brush 21 is set so that the brush moves by the width while the roll 8 rotates twice. Next, with reference to FIG. 4, a case will be described in which the pressing amount of the rotating brush is automatically controlled online.

A brush rotating motor load command signal is input to the load amount controller 36, and the position of the second stage 19 corresponding to the pressing load of the brush 21 is determined. The brush rotating motor load command signal is a signal for pressing the rotating brush 21 against the roll 8 with a constant force, and is arbitrarily set and input by the operator from another control system. This additional command is compared with the feedback of the load on the motor 20 detected using the current detector and voltage detector installed on the brush rotation motor 20, and the result is used as a position command signal. It is sent to the controller 37. Furthermore, this is compared with the position detection signal from the position detector 22. As a result, the amount of wear (reduction in diameter) of the rotating brush 21 is reduced.
Understand the
The corrected position of the stage 19 is determined. The corrected position command signal is sent to the servo motor 17 via the speed controller 38. In the speed controller 38, the brush 2
In order to prevent hunting of motor 17, the transmission signal is varied so that motor 17 starts slowly. As a result, the rotating brush 21 is gently and evenly pressed against the roll 8. In this way, the pressing amount of the rotating brush 21 is maintained substantially constant from the initial stage of use to the final stage of use. When the feed amount of the second stage 19 exceeds a predetermined threshold value, it means that the wear loss of the rotary brush 21 has reached an allowable limit, and therefore the rotary brush 21 is replaced.

[0023]

According to the present invention, a roll for conveying a plated steel strip can be automatically ground online using a rotating brush without depending on the operator. For this reason,
High quality plated steel sheets can be manufactured unattended. In addition, the quality of the product is stabilized because it is no longer affected by the skill level of the worker.

Furthermore, since the amount of brush pressing against the conveying roll can be maintained substantially constant from the initial stage to the final stage of use, the crown of the roll can be ground almost uniformly.

[Brief explanation of the drawing]

FIG. 1 is a mechanical block perspective view schematically showing an automatic roll polishing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing part of a continuous hot-dip galvanizing line.

FIG. 3 is a control block diagram of brush running speed.

FIG. 4 is a control block diagram of brush pressing amount.

[Explanation of symbols]

2; Steel strip, 8; Roller, 10; Automatic polishing device, 12, 1
9; stage, 13, 17, 20; motor, 16; cylinder, 18; screw jack, 21; rotating brush,
30; controller

Claims (1)

[Claims] Claim 1: In an automatic roll polishing device for online removal of foreign matter adhering to rolls for conveying plated steel strips, a rotary grinding device for removing foreign matter adhering to the rolls, and a rotary grinding device for removing foreign matter adhering to the rolls; a pressing mechanism for pressing the rotary grinding object against the roll; a reciprocating mechanism for reciprocating the rotary grinding object along the roll axis; and means for detecting the state of wear of the rotary grinding object;
A control means for controlling the amount of pressing of the rotary grinding object by the pressing mechanism according to the detection result, and controlling the moving speed of the rotary grinding object by the reciprocating mechanism according to the conveyance speed of the plated steel strip; An automatic roll polishing device characterized by having: