KR101159590B1

KR101159590B1 - Device for prevention of falling of dummy bar

Info

Publication number: KR101159590B1
Application number: KR1020100028804A
Authority: KR
Inventors: 류주영
Original assignee: 현대제철 주식회사
Priority date: 2010-03-30
Filing date: 2010-03-30
Publication date: 2012-06-26
Also published as: KR20110109197A

Abstract

The present invention relates to a dummy bar fall prevention device that prevents the dummy bar from falling by raising and lowering the segment roll when the operation of the PLS stops, and includes an accumulator and an accumulator for supplying a high pressure fluid to a cylinder for raising and lowering the segment roll. It includes an accumulator valve for regulating the flow of the supplied fluid, the PLC monitoring unit switched according to the operating state of the PLC and the valve driving unit for driving the accumulator valve to raise and lower the segment roll in accordance with the switching operation of the PLC monitoring unit It is characterized by.

Description

Dummy bar fall prevention device {DEVICE FOR PREVENTION OF FALLING OF DUMMY BAR}

The present invention relates to a continuous casting machine, and more particularly, to a dummy bar fall prevention device for preventing the fall of the dummy bar by raising and lowering the segment roll when the operation of the PL.

In general, in the continuous casting process, the molten steel contained in the ladle is supplied to the tundish, and the molten steel of the tundish is supplied to the mold having the lower side opened through the immersion nozzle installed at the lower portion.

The molten steel supplied to the mold is cast into slabs having a predetermined width and thickness while being cooled through the segments.

Since the slab cannot be smoothly transferred to the curved portion of the lower part of the mold and the end of the segment facility by its own weight, the slab is connected to the tip of the slab to draw the slab from the mold and the segment.

The above technical configuration is a background art for helping understanding of the present invention, and does not mean a conventional technology well known in the art.

The present invention, when the operation of the PLC (PROGRAMMABLE LOGIC CONTROLLER; PLC) is stopped, by supplying a high-pressure fluid to the cylinder for operating the segment roll by raising and lowering the segment roll, to prevent the dummy bar fall to prevent the fall of the dummy bar The purpose is to provide a device.

Another object of the present invention is to prevent the time and economic losses due to the fall of the dummy bar.

The dummy bar fall prevention apparatus of the present invention includes an accumulator for supplying a high pressure fluid to a cylinder for raising and lowering a segment roll; An accumulator valve for regulating the flow of the fluid supplied from the accumulator; A PLC monitoring unit switched according to the PLC operating state; And a valve driving unit driving the accumulator valve to raise and lower the segment roll according to the switching operation of the PLC monitoring unit.

The PLC monitoring unit of the present invention is installed in the PLC, when the operation of the PLC stop, the PLC monitoring relay turned on; And an auxiliary relay for turning on the valve driving unit when the PLC monitoring relay is turned on.

In the present invention, it is characterized in that it further comprises a check valve installed on the outlet side of the accumulator valve to prevent the back flow of the fluid supplied to the cylinder.

The valve driving unit of the present invention is characterized in that when the PLC monitoring unit is turned on open the accumulator valve.

According to the present invention, when the operation of the PLS stops, supplying a high-pressure fluid to the cylinder for operating the segment roll to raise and lower the segment roll, thereby preventing the fall of the dummy bar, the time and economic loss caused by the fall of the dummy bar Prevent it beforehand.

1 is a block diagram of a dummy bar fall prevention apparatus according to an embodiment of the present invention.

Hereinafter, a dummy bar fall prevention apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user's or operator's intention or custom. Therefore, the definitions of these terms should be made based on the contents throughout the specification.

Dummy bar fall prevention apparatus according to an embodiment of the present invention is a PG (PROGRAMMABLE LOGIC CONTROLLER; PLC) monitoring unit 80, the accumulator (ACCUMULATOR) 50, the check valve 30, the accumulator valve 40 and the valve The drive unit 60 is included.

In the continuous casting facility, each segment has a segment roll for moving while pressing the dummy bar and the slab SAB.

The segment roll consists of an upper roll 1 and a lower roll 2. The upper roll 1 presses the slab S at the top of the slab S, and the lower roll 2 presses the slab S at the bottom of the slab S. This segment roll is lifted up and down by a cylinder.

The cylinder has an upper roll cylinder 10 for elevating the upper roll 1 and a lower roll cylinder 20 for elevating the lower roll 2.

The upper roll cylinder 10 is formed inside the cylinder body 12 and the cylinder body 11, one side of which is connected to the upper roll 1 to protrude and insert the cylinder body 12, so that the cylinder arm 12 protrudes. It is provided with a protrusion 13 filled with the fluid and an insert 14 formed inside the cylinder body 11 to fill the fluid so that the cylinder arm 12 is inserted.

The lower roll cylinder 20 is formed inside the cylinder body 22 and the cylinder body 21, one side of which is connected to the lower roll 2 and protrudes and is inserted into the cylinder body 21 so that the cylinder arm 22 protrudes. It is provided with a protrusion 23 filled with the fluid and an insertion portion 24 formed inside the cylinder body 21 to fill the fluid so that the cylinder arm 22 is inserted therein.

Here, the high pressure fluid is filled in the protrusion 13 of the upper roll cylinder 10 and the protrusion 23 of the lower roll cylinder 20. Accordingly, each of the cylinder arms 12 and 22 protrudes, pressing the slab S up and down as shown in the arrow direction to hold the dummy bar or the slab S, thereby preventing the fall.

The accumulator 50 fills the high pressure fluid and supplies the high pressure fluid to the upper roll cylinder 10 and the lower roll cylinder 20 so that the upper roll 1 and the lower roll 2 are lifted up and down. The flow path connected to the accumulator 50 is branched and connected to the protrusions 13 of the upper roll cylinder 10 and the protrusions 23 of the lower roll cylinder 20, respectively, thereby providing a high pressure fluid to each of the protrusions 13,. 23).

The accumulator valve 40 interrupts the flow of the fluid supplied from the accumulator 50 in accordance with the switching operation of the valve driver 60. Here, the accumulator valve 40 is opened when the valve driver 60 is turned on and closed when the valve driver 60 is turned off.

The check valve 30 is installed at the outlet side of the accumulator valve 40 to prevent backflow of the fluid supplied to the upper roll cylinder 10 and the lower roll cylinder 20.

The PLC monitoring unit 80 is switched according to the operating state of the PLC 70. That is, the operating state of the PLC 70 is monitored to turn on when the operation of the PLC 70 is stopped, and to be turned off when the PLC 70 is not stopped.

The PLC monitoring unit 80 includes a PLC monitoring relay 81 and an auxiliary relay 82.

The PLC monitoring relay 81 is installed in the PLC 70 and is turned on when the PLC 70 is stopped. Here, the stopping of the operation of the PL 70 refers to a state in which the operation of the PL 70 is stopped due to a power failure or an error.

The auxiliary relay 82 is turned on or off in accordance with the switching operation of the PLC monitoring relay 81 to turn on or turn off the valve driver 60. That is, when the PRC monitoring relay 81 is turned on, the valve drive unit 60 is turned on.

The valve driver 60 drives the accumulator valve 40 in accordance with the switching operation of the auxiliary relay 82. In this case, the valve driving unit 60 drives the accumulator valve 40 to raise and lower the segment roll when the PLC monitoring unit 80 is turned on. As a result, the upper roll cylinder 10 is driven to lower the upper roll 1, and the lower roll cylinder 20 is driven to raise the lower roll 2.

On the other hand, the valve drive unit 60 is installed to correspond to each segment, and are connected in parallel to each other.

That is, the auxiliary relay 82 is connected to the valve driving unit 60 of each segment of the performance equipment, for example, the second, third, fourth, seventh, and eighth segments, and the valve driving unit 60 is number two. And the upper roll 1 and the lower roll of each of these segments (segments 2, 3, 4, 7, and 8) by being installed in segments 3, 4, 7, and 8 and connected in parallel with each other. (2) is raised and lowered at the same time.

For reference, FIG. 1 illustrates a dummy bar fall prevention apparatus installed in segment 2, which is equally installed in segments 3, 4, 7, and 8.

On the other hand, the upper roll cylinder 10 and the lower roll cylinder 20 is raised and lowered by the hydraulic circuit (90).

The solenoid valve 91 of the hydraulic circuit 90 supplies fluid to the upper roll cylinder 10 and the lower roll cylinder 20. The solenoid valve 91 supplies fluid to each of the protrusions 13 and 23 and the insertion portions 14 and 24 of the upper roll cylinder 10 and the lower roll cylinder 20.

The first check valve 92 and the second check valve 93 are installed at the outlet side of the solenoid valve 91 so that the protrusions 13 and 23 and the inserting portions of the upper roll cylinder 10 and the lower roll cylinder 20 are provided. To prevent backflow of fluid to 14, 24). The first check valve 92 prevents backflow of the fluid supplied to the protrusions 13 and 23. The second check valve 93 prevents backflow of the fluid supplied to the inserts 14, 24.

Hereinafter, an operation process of the dummy bar fall prevention apparatus according to an embodiment of the present invention will be described.

First, the PLC 70 controls the solenoid valve 90 according to the playing process to supply the fluid to the upper roll cylinder 10 and the lower roll cylinder 20. The first check valve 92 and the second check valve 93 prevent backflow of the fluid supplied to the upper roll cylinder 10 and the lower roll cylinder 20. Accordingly, the upper roll cylinder 1 and the lower roll cylinder 2 are moved up and down while pressing down the dummy bar or the slab S.

In this process, when the operation of the PD 70 stops due to a power failure or an error, the PD monitoring relay 81 is turned on and the auxiliary relay 82 is turned on.

As the auxiliary relay 82 is turned on, the valve driving unit 60 installed in the second, third, fourth, seventh, and eighth segments is turned on.

For reference, in the present embodiment, the control of the segment roll of segment 2 will be described as an example.

On the other hand, when the valve drive unit 60 is turned on, the accumulator valve 40 is opened.

As the accumulator valve 40 opens, the high pressure fluid filled in the accumulator 50 passes through the check valve 30 and the protrusion 13 of the upper roll cylinder 10 and the protrusion 23 of the lower roll cylinder 20. Is supplied.

Accordingly, the cylinder arm 12 of the upper roll cylinder 10 is lowered, the cylinder arm 22 of the lower roll cylinder 20 is raised to raise and lower the upper roll 1 and the lower roll 2, It will hold the slab (S).

Meanwhile, in this process, the fluid supplied from the accumulator 50 is blocked by the first check valve 92, so that only the protrusions 13 of the upper roll cylinder 10 and the protrusions 23 of the lower roll cylinder 20 are used. Supplied.

For reference, in the present exemplary embodiment, the flow path for supplying the fluid from the accumulator 50 is connected to the flow path connected to the upper roll cylinder 10 and the lower roll cylinder 20 from the first check valve 92 by way of example. However, alternatively, it will be obvious to form a separate flow path.

That is, in the dummy bar fall prevention apparatus according to the exemplary embodiment of the present invention, the upper roll cylinder 10 and the lower roll cylinder 20 are formed by the fluid supplied from the accumulator 50 even when the operation of the PLC 70 is stopped. In operation, the upper roll 1 and the lower roll 2 are moved up and down to hold the dummy bar or the slab S, thereby preventing the fall of the dummy bar.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary and various modifications and equivalent other embodiments are possible for those skilled in the art to which the art pertains. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the claims below.

1: upper roll 2: lower roll
10: upper roll cylinder 11: cylinder body
12: cylinder arm 13: protrusion
14: inserting portion 20: lower roll cylinder
21: cylinder body 22: cylinder arm
23: projection 24: insertion
30: check valve 40: accumulator valve
50: accumulator 60: valve drive unit
70: PLC 80: PD watchdog
81: PLC supervision relay 82: auxiliary relay
90: hydraulic circuit 91: solenoid valve
92: check valve 93: check valve

Claims

An accumulator for supplying a high pressure fluid to a cylinder for lifting and lowering the segment roll;
An accumulator valve for regulating the flow of the fluid supplied from the accumulator;
A PLC monitoring unit switched according to the PLC operating state; And
In accordance with the switching operation of the PLC monitoring unit includes a valve driving unit for driving the accumulator valve to raise and lower the segment roll,
The valve driving unit opens the accumulator valve when the PLC monitor is turned on,
The PLC monitoring unit is installed in the PLC and when the operation of the PLC stop, the PLC monitoring relay turned on, and when the PLC monitoring relay is turned on, it comprises an auxiliary relay for turning on the valve drive unit Dummy bar fall prevention device.

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The dummy bar fall prevention apparatus according to claim 1, further comprising a check valve installed at an outlet side of the accumulator valve to prevent backflow of the fluid supplied to the cylinder.

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