KR20170065047A - Apparatus for handling strip breakage in Rolling Mill System - Google Patents

Apparatus for handling strip breakage in Rolling Mill System Download PDF

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Publication number
KR20170065047A
KR20170065047A KR1020150170429A KR20150170429A KR20170065047A KR 20170065047 A KR20170065047 A KR 20170065047A KR 1020150170429 A KR1020150170429 A KR 1020150170429A KR 20150170429 A KR20150170429 A KR 20150170429A KR 20170065047 A KR20170065047 A KR 20170065047A
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KR
South Korea
Prior art keywords
strip
rolling mill
roll
rolling
plate
Prior art date
Application number
KR1020150170429A
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Korean (ko)
Inventor
신재석
심광호
Original Assignee
주식회사 포스코
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Publication date
Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Priority to KR1020150170429A priority Critical patent/KR20170065047A/en
Publication of KR20170065047A publication Critical patent/KR20170065047A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B33/00—Safety devices not otherwise provided for; Breaker blocks; Devices for freeing jammed rolls for handling cobbles; Overload safety devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B33/00—Safety devices not otherwise provided for; Breaker blocks; Devices for freeing jammed rolls for handling cobbles; Overload safety devices
    • B21B33/02—Preventing fracture of rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B38/00—Methods or devices for measuring, detecting or monitoring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B39/14—Guiding, positioning or aligning work

Abstract

A strip plate breaking action device of a rolling mill is disclosed. A strip plate breakage preventing apparatus for a rolling mill according to an embodiment of the present invention includes a sensing unit for detecting plate breakage of a strip during a cold rolling process by a rolling mill and a pair of strips provided at the front and rear sides of the rolling mill, A holding unit for clamping, and a roll control unit for separating the upper and lower rolling rolls from the strip inside the rolling mill when the plate rupture is detected.

Figure P1020150170429

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a strip-

The present invention relates to a strip plate breakage preventing apparatus for a rolling mill, and more particularly, to a strip plate breakage preventing apparatus for a rolling mill capable of reducing the damage of a rolling roll caused by plate breaking occurring during a rolling operation.

In the field of steel manufacturing, cold rolled steel sheets are manufactured through a series of processes such as pickling, cold rolling, cleaning, annealing, temper rolling and correction.

Among them, the cold rolling step is a step of rolling a metal material such as steel or stainless steel at a temperature close to room temperature. The metal material (strip) is put between rolling rolls to reduce the thickness or the cross- Is called rolling (rolling).

The ZRM type rolling mill equipment used in the cold rolling process has a reel for winding a stainless steel cold rolled steel sheet in both directions by a reversible rolling method, and a cold rolling mill is installed in the middle of the rolling mill, so rolling is performed five to six times.

During the rolling process, steel strips may occur due to various factors. Plate breakage means that the steel plate breaks in the form of tearing in the width direction, and the main cause is the occurrence of inaccurate operation due to the nature of the cold rolling mill constituted by material defects and / or complicated facility mechanisms. Specific examples are caused by welding defects at the welding site, cracks occurring at the edge of the steel sheet, and scabs.

If sheet breakage occurs, the intermediate part of the steel sheet is broken, and the rolled rolls in which debris is splashed or the breakage part is arranged in the up-and-down direction inside the rolling mill can be damaged. In addition, since the rolling mill is required to re-weld the broken portion or to reconnect it by means of a connecting means, after the plate breaking portion is completely removed from the rolling mill at a low speed, the rolling speed must be increased again and rolled, It takes a lot of manpower to operate the shop.

In order to minimize the damage of the plate rupture, it is very important to separate the steel roll and the rolling roll in which the rolling point is formed as soon as possible when the plate rupture occurs.

Korean Registration Practice No. 20-0164246 (October 10, 1999)

The apparatus for rupturing the strip plate of the rolling mill according to the embodiment of the present invention intends to perform the subsequent processing quickly so that the impact is not transmitted to the rolling facility when the plate rupture occurs.

According to an aspect of the present invention, there is provided a rolling mill including a sensing unit for sensing plate breakage of a strip during a cold rolling process by a rolling mill, a holding unit provided at the front and rear of the rolling mill to clamp both ends of the strip, And a roll control unit for separating the upper and lower rolling rolls from the strip inside the rolling mill when the plate rupture is sensed.

The holding unit may include a tension roll provided at a lower portion of the path of the strip, a pair of hopper rolls adjacent to the tension roll and spaced from the strip at an upper portion on the strip path, When the plate is broken, the strip can be clamped by using the tensile roll and the hopper roll.

In addition, the roll control unit may include a taper block which enters the upper and lower rolling rolls of the rolling mill at the time of plate breaking, and a driving cylinder for driving the taper block.

Further, the taper block may include a soft protector at an end thereof.

The driving cylinder may be a tandem type driving cylinder.

The apparatus for rupturing a strip of a rolling mill according to an embodiment of the present invention prevents the strip from swinging by holding both ends of the ruptured strip when the occurrence of the rupture is detected and separates the rolls from the strip, It is possible to effectively prevent the damage of the rolling roll caused by the roll.

1 is a perspective view showing a rolling mill equipped with a plate breaking action device according to an embodiment of the present invention.
2 is a view showing a rolling mill including a plate breaking action device according to an embodiment of the present invention.
3 is a view showing a holding unit in a strip plate breakage preventing apparatus of a rolling mill according to an embodiment of the present invention.
4 is a view showing a roll control unit in a strip plate breakage preventing apparatus of a rolling mill according to an embodiment of the present invention.
5 is a partial cut-away view of a drive cylinder of a roll control unit in a strip plate breakage preventing apparatus of a rolling mill according to an embodiment of the present invention.
6 is a side view for explaining the operation of the holding unit in the apparatus for breaking the strip in the rolling mill according to the embodiment of the present invention.
7 is a view for explaining the operation of a roll control unit in a strip plate breakage preventing apparatus of a rolling mill according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

FIG. 1 is a schematic view showing the construction of a cold rolling system in which a plate breaking action device according to an embodiment of the present invention is used. Herein, the cold rolling system is exemplified in the present embodiment, but the present invention is not limited thereto. It is needless to say that the hot rolling system can be easily modified and modified by a person skilled in the art.

Referring to the drawings, the cold rolling system includes two tension reels 10 and 12 and a cold rolling mill 20 provided between the two tension reels 10 and 12.

The two tension reels 10 and 12 are composed of an input side tension reel 10 and an output side tension reel 12. The strip S released from the coil wound on the input side tension reel 10 is pushed and fixed by the pinch roll 14 and then is wound around the output side tension reel 12 ).

During the process, the strip S may not be accurately introduced into the output tension reel 12 due to its thickness, material, appearance, or type of steel. In order to correct this, the operator spreads the tip of the strip S and passes the tip of the strip S through an oil wiper (not shown) using a jig. The strip S then passes through the cold rolling mill 20 (Not shown) and then sent to the output tension reel 12. Reference numeral 16 is a deflector roll, and 18 is a shape roll.

That is, in summary, in the cold rolling system, the strip S is unwound from the input tension reel 10, and the pinch roll 14 deflector 16, the shaping roll 18, the inlet oil wiper, the cold rolling mill 20, And enters the output tension reel (12) through the output oil wiper.

As the cold rolling mill 20, a multi-stage rolling mill may be employed. Hereinafter, the structure of the rolling mill 20 will be described as an example of a 20-staged rolling mill, but the present invention is not limited thereto and may be applied to the 4th, 6th, 12th,

The cold rolling mill 20 includes a plurality of rolling rolls such as four upper backup rolls 21 and four lower backup rolls 22 and an inner side of the upper backup roll 21 and the lower backup roll 22 Three intermediate rolls 23 and 24 provided respectively on the intermediate rolls 25 and 26, two primary intermediate rolls 25 and 26, and one working roll 27 and 28, respectively. In order to roll the thin plate, the roll diameter must be made small. If the diameter is made small, it is difficult to obtain accuracy (precision) because the roll is warped. In the case of a 20-staged mill, a large number of supporting rolls are placed around a work roll having a very small size, so that the entire stiffener is made rigid.

The cold rolling mill 20 for rolling the annealed hot coils performs the rolling process while reversing the strip S 5 to 6 times. The primary path of the strip S is performed while proceeding from the input side tension reel 10 to the output side tension reel 12 and then the strip S is advanced from the output side tension reel 12 to the input side tension reel 10 A secondary pass is made. When the reversible rolling is carried out while passing through these processes 5 to 6 times, the rolled steel strip S having the final desired thickness can be processed.

On the other hand, during the rolling process as described above, plate stripping may occur in the strip S. If a plate break occurs, the broken part is re-welded or re-connected using a connecting means, so that the plate break should be detected and follow-up promptly.

The apparatus for breaking the strip according to the present embodiment comprises a sensing unit 30 for sensing the plate break, a holding unit 40 for clamping and holding the plate broken by the strip, And a roll control unit 50 for adjusting the interval.

The plate break detection unit 30 includes a tension sensor for detecting the tension of the strip passing through the rolling mill. As the tension sensor, both the method of directly measuring the tension of the strip and the method of measuring by using the sound wave (frequency) can be employed. In this embodiment, the tension sensor is provided in the tension roll of the holding unit 40 to be described later, but it is not limited to the position of the tension roll, but may be suitably provided in the strip path line of the rolling mill.

The holding unit 40 is for fast clamping and holding the plate breaking end (end) of the strip S and is provided forward and backward with respect to the strip conveying direction in the rolling mill 20, respectively.

2 and 3, the holding unit 40 includes a base frame 41, a tension roll 42 and a hopper roll 44 provided on the base frame, and a lifting unit 42 for lifting and lowering the tension roll 42 And a cylinder (45).

The base frame 41 is provided on the lower side of the strip S and includes a base 41a on which the tension roll 42 is installed and a base 41b extending vertically from both sides of the base 41a to the upper side of the strip S And a pair of support bars 41b. A tension roller 42 is rotatably installed in an inner space formed by the base 41a and the support bar 41b. The tension roller 42 is supported by a cylinder 45 provided at the lower portion thereof, So that it can be selectively raised and lowered. The tension sensor of the above-described sensing unit 30 may be installed on the rotation shaft of the tension roll 42.

A hopper roll 44 is rotatably provided at the end of the support bar 41b. The hopper roll 44 is normally spaced upward from the strip S by a predetermined distance. A height detection sensor 46 is provided on the side wall of the support bar 41b to sense the height of the tension roll 42. A tension sensor 46 is attached to the rod 47 of the cylinder 45, A sensing bar 48 is provided for sensing the position of the sensor 42. Although not shown, the cylinder 45 is provided with a load cell to accurately control the height of the cylinder rod 47 for lifting and lowering the tension roll 42 as shown in Fig.

2 and 4, the roll control unit 50 quickly separates the interval between the plurality of rolling rolls R provided on the rolling mill 20, particularly the work rolls 27 and 28, .

To this end, the roll control unit 50 includes a taper block 51 for horizontally entering the work rolls 27 and 28 to move the work roll up and down when the plate is broken and a taper block 51 for driving the taper block 51 And a driving cylinder 55 for driving the motor.

The taper block 51 is made of a metal material having high rigidity so as to withstand the impact of the strip steel plate. The tip of the taper block 51 is made of a synthetic resin material so as not to be damaged when the work rolls 27, A protector 52 is provided. The protector 52 and the taper block 51 are inclined from the rear end toward the front end like a wedge.

The drive cylinder 55 is for rapidly bringing the taper block 51, which is normally spaced from the rolling roll, at the time of plate breakage, and a tandem cylinder can be used so that a fast and large output can be obtained.

As shown in FIG. 5, the tandem type drive cylinder 55 has a structure in which two pistons 55a and 55b are provided in series, and the cylinder is used where a large force is required although the size is limited. The tandem-type drive cylinder 55 operates by pneumatic or hydraulic pressure, and its operation will be described later.

The piston rod 55b of the tandem type drive cylinder 55 is fastened to the bracket 53 provided on the back surface of the taper block 51 and the movable length of the bracket 53 is controlled in parallel with the drive cylinder 55 A guide rod 54 is provided.

6 and 7, the operation of the strip plate breakage preventing apparatus of the rolling mill having the above-described structure will be described.

When the plate rupture of the strip s is sensed by the sensing unit 30 provided on the tension roll 42 during the rolling process, the holding unit 40 can quickly rotate the tension roll 42 So that the strip is lifted and held between the pair of hopper rolls 44 and the tension rolls 42. The movement distance of the tension roll 42 can be controlled by the height sensor 46, the sensing bar 47 and the load cell in the cylinder 45 not shown.

Since the holding unit 40 is provided before and after the rolling mill 20, the pair of holding units 40 clamps the cut ends of the strips cut inside the rolling mill from both sides, The damage of the rolling mill can be effectively prevented.

Further, when the plate breakage is detected, the roll control unit 50 quickly operates the drive cylinder 55 to advance the data block 51 to separate the gap between the work rolls 27 and 28.

7, the first piston 55a and the second piston 55b of the normal driving cylinder 55 are connected to the first chamber 56a (Or air pressure) supplied and discharged in the direction of the arrow so as to be positioned on the right side of the second chamber 56b and the right side of the second chamber 56b (see FIG.

When the breakage of the plate of the strip is detected, the direction of movement of the hydraulic pressure supplied to the drive cylinder 55 is reversely changed so that the first piston 55a and the second piston 55b move to the left side of the drawing. The flow rates of the first chamber 56a and the second chamber 56b are different from each other and the second piston 55b directly connected to the taper block 51 is connected to the second chamber 56b And the pressure of the second rod 55c of the first piston 55a is simultaneously pressed, the taper block 51 can be pushed forward more quickly.

The roll control unit 50 provided on the front and rear sides of the rolling mill 20 is driven by the driving cylinder 55 to push the pair of taper blocks 51 from both sides of the work rolls 27 and 28, The damage of the rolling roll can be effectively prevented.

10,12 .. Tension Reel 20 .. Rolling Mill
30. Platen break detection unit 40 .. Holding unit
42 .. tension roll 44 .. hopper roll
45 .. cylinder 46 .. height sensor
50 .. Roll control unit 51 .. Taper block
55 .. Drive Cylinder S .. Strip

Claims (6)

A sensing unit for sensing plate breakage of the strip during the cold rolling process by the rolling mill,
A holding unit provided on the front and rear sides of the rolling mill for clamping both ends of the broken strip when the plate is broken,
And a roll control unit for separating the upper and lower rolling rolls from the strip inside the rolling mill when the plate rupture is detected. The method according to claim 1,
The holding unit includes a tension roll provided at a lower portion of the path of the strip,
A pair of hopper rolls adjacent to the tension roll and spaced from the strip at an upper portion on the strip path,
And a cylinder for raising the tension roll to the hopper roll,
And a strip clamping device for clamping the strip by using the tensile roll and the hopper roll when detecting the plate breakage. 3. The method of claim 2,
Wherein the detection unit is provided in the tension roll. The method according to claim 1,
The roll control unit
A taper block which enters the upper and lower rolling rolls of the rolling mill when the plate is broken,
And a drive cylinder for driving the taper block. 5. The method of claim 4,
Wherein the taper block includes a soft protector at an end thereof. 5. The method of claim 4,
Wherein said drive cylinder is a tandem type drive cylinder.
KR1020150170429A 2015-12-02 2015-12-02 Apparatus for handling strip breakage in Rolling Mill System KR20170065047A (en)

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KR1020150170429A KR20170065047A (en) 2015-12-02 2015-12-02 Apparatus for handling strip breakage in Rolling Mill System

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KR1020150170429A KR20170065047A (en) 2015-12-02 2015-12-02 Apparatus for handling strip breakage in Rolling Mill System

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112371729A (en) * 2020-09-11 2021-02-19 宁波宝新不锈钢有限公司 Strip breakage protection method for Sendzimir rolling mill

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112371729A (en) * 2020-09-11 2021-02-19 宁波宝新不锈钢有限公司 Strip breakage protection method for Sendzimir rolling mill

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