JP2013056362A - Device and method for collecting dust of continuous casting machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a practical device for collecting dusts of a continuous casting machine, which can collect dusts.SOLUTION: The device 11 for collecting dusts of a continuous casting machine, collects dusts generated in cutting a cast slab 2 that is continuously casted, by a cutting device 4. The device for collecting dusts is provided with a dust collecting duct 12 having a suction side 12a for sucking dusts and an outlet side 12c for discharging dusts, wherein the suction side 12a is arranged above the cutting device 4 and the suction side 12a of the dust collecting duct 12 is directed toward a sluice 14 positioned below a table 3 for transporting the cast slab 2 so as to allow the dusts discharged from the dust collecting duct 12 to flow through the sluice 14 positioned below the table 3.

Description

  The present invention relates to a dust collecting apparatus and method for a continuous casting machine that collects dust generated when a continuously cast slab is cut by a cutting device.

  In a continuous casting machine, it is indispensable to cut the slab on the table carry-out side. As the cutting method, (1) a method of blowing out and blowing oxygen, (2) a method of cutting using a blade such as a shear, and (3) a method of cutting using oxygen mixed with powder are used. In the slab continuous casting machine, in most cases, the method (1) of fusing with oxygen is used, and the method (3) is used for casting high Cr steel such as stainless steel.

  In the case of the method (1) in which oxygen is blown out and cut, fine fumes are generated when cutting is performed by a cutting device called a torch cutter. Ascending airflow is generated by the radiant heat received from the slab and the heat generated at the time of cutting, the fumes are rolled up in the factory by the ascending airflow. In the case of the method of cutting using oxygen mixed with the powder of (3), the powder is similarly scattered in the factory by the rising air flow. A dust collector is required to collect these dusts.

  In Patent Document 1, a dust collection hood is provided above the torch cutter, a blower is connected to the dust collection hood via a dust collection duct, dust generated during cutting is sucked by the blower, and is provided in the middle of the dust collection duct. A dust collector that collects dust with a filter cloth is disclosed.

  In Patent Document 2, a large number of dust collection hoods are arranged in the longitudinal direction in the vicinity of a table that transports a slab, and is positioned in the dust generation range according to fluctuations in the dust generation range accompanying the movement of the torch cutter when the slab is cut. There is disclosed a dust collector that switches and controls a damper so that a dust collecting action is applied only to the dust collecting hood and the dust collecting hood is not applied to other dust collecting hoods.

JP 58-6757 A JP 62-282758 A

  However, in the dust collecting apparatus described in Patent Document 1, since the torch cutter is cut while moving in synchronization with the slab, it is necessary to cover the entire moving range of the torch cutter with a dust collecting hood. For this reason, there is a problem that the dust collecting hood becomes large and the dust collecting apparatus becomes large and expensive, and the dust collecting hood gets in the way when maintaining the torch cutter.

  According to the invention described in Patent Document 2, the dust collection hood is applied only to the dust collection hood located in the dust generation range, and the dust collection hood is not applied to other dust collection hoods. Can solve the problem. However, since a large number of dust collecting hoods are installed beside the table side, the dust collecting hood sucks the cooling water at the time of cutting together with the dust. For this reason, there is a problem that water collects in the dust collecting hood and it becomes impossible to collect the dust, which makes it a practical dust collector.

  From the above, the dust collector is often not installed in the torch cutter of the slab continuous casting machine. If a dust collector is not installed, fume will scatter and accumulate in the factory.For continuous casters where the cutter operation room is located nearby, positive pressure is required to prevent dust from entering the operation room. The operator needs to clean the deck and cast floor regularly.

  An object of the present invention is to solve the problems of the conventional dust collector, and to provide a dust collector and method for a practical continuous casting machine that can collect dust.

  In order to solve the above-mentioned problem, the invention described in claim 1 sucks dust in a dust collector of a continuous casting machine that collects dust generated when a continuously cast slab is cut by a cutting device. A dust collection duct having a suction side and an outlet side for discharging dust is provided, the suction side is arranged above a cutting device, and the outlet side of the dust collection duct is directed to a sluice under a table that conveys a slab, It is a dust collector of the continuous casting machine which flows the dust discharged | emitted from the said dust collection duct to the sluice under a table.

  The invention according to claim 2 is the dust collector of the continuous casting machine according to claim 1, wherein the dust collecting duct is movable together with the cutting device in the moving direction of the slab. It is provided in.

  According to a third aspect of the present invention, in the dust collector of the continuous casting machine according to the first or second aspect, the dust collector further includes a pipe installed in the dust collection duct, and the dust collector is arranged from the pipe. It is characterized in that dust is sucked in on the suction side of the dust collection duct by blowing air toward the outlet side of the dust duct.

  According to a fourth aspect of the present invention, in the dust collector of the continuous casting machine according to the third aspect, the pipe branches from a pipe for supplying air to the cutting device.

  According to a fifth aspect of the present invention, there is provided a dust collecting method for a continuous casting machine that collects dust generated when a continuously cast slab is cut by a cutting device, and a dust collecting duct provided above the cutting device. Dust is sucked in on the suction side, discharged from the outlet side of the dust collection duct, the outlet side of the dust collection duct is directed to the sluice under the table that transports the slab, and the dust discharged from the dust collection duct is directed to the sluice under the table. It is a dust collection method of a continuous casting machine that flows through

  According to the first aspect of the present invention, dust generated when cutting a slab can be caused to flow through the sluice below the table, so that the slab is discharged together with the slab metal discharged when the slab is cut. Can be processed. Since dust can be collected, dust such as fume can be prevented from accumulating on the deck and cast floor around the cutting device, and it is not necessary to clean the filter cloth of the dust collector. Therefore, it is possible to reduce the operator's cleaning load, the floor slip due to the accumulation of dust, and the operator's load to prevent dust.

  According to invention of Claim 2, since a dust collection duct moves with a cutting device, size reduction of the suction side of a dust collection duct can be achieved.

  According to the third aspect of the present invention, dust can be sucked on the suction side of the dust collecting duct by the ejector effect.

  According to the fourth aspect of the present invention, since the piping for generating the ejector effect branches off from the existing piping for supplying air to the combustion device, the structure of the dust collector can be simplified.

  According to the fifth aspect of the present invention, dust generated when the slab is cut can be flowed to the sluice below the table, so that together with the slab metal discharged when the slab is cut. Can be processed. Since dust can be collected, dust such as fume can be prevented from accumulating on the deck and cast floor around the cutting device, and it is not necessary to clean the filter cloth of the dust collector. Therefore, it is possible to reduce the operator's cleaning load, the floor slip due to the accumulation of dust, and the operator's load to prevent dust.

Side view of conventional dust collector Front view of conventional dust collector Side view of the dust collector of this embodiment Front view of the dust collector of this embodiment

  Hereinafter, based on an accompanying drawing, a dust collecting device of a continuous casting machine in one embodiment of the present invention is explained in detail. 1 and 2 show a conventional dust collector, and FIGS. 3 and 4 show the dust collector of this embodiment. In order to facilitate understanding of the dust collector of this embodiment, the dust collector of this embodiment will be described in comparison with a conventional dust collector.

  First, a conventional dust collector will be described. FIG. 1 shows a side view of a conventional dust collector, and FIG. 2 shows a front view of the conventional dust collector 1 (a view seen from the moving direction of a slab as a slab). 1 and 2 also show a table 3 for conveying a slab 2 together with a conventional dust collector 1 and a torch cutter 4 as a cutting device for cutting the slab 2 into a certain length.

  The slab 2 continuously cast from the tundish through the mold is sent onto the table 3. The table 3 is configured by arranging a large number of table rollers 3a at an equal pitch.

  Above the table 3 is provided a torch cutter 4 having a moving carriage structure that reciprocates in the moving direction of the slab 2. While the torch cutter 4 moves in synchronism with the slab 2 from the start end side to the end end side of the table 3, the high pressure oxygen is ejected from the blow tube 6 to melt the slab 2. The torch cutter 4 is self-propelled to the start end when one cutting is completed, and waits there. When the slab 2 is fed by a certain amount, the slab 2 is cut while moving in synchronization with the slab 2 again, and the continuously cast slab 2 is successively cut into a fixed length.

  The structure of each part of the torch cutter 4 is as follows. A pair of torch rails 7 are provided on the left and right sides of the table 3. The movable carriage 8 of the torch cutter 4 is self-propelled on the pair of torch rails 7. A pair of blow pipes 6 are provided on the torch mount 8 a of the movable carriage 8 so as to be movable in the width direction of the slab 2. The pair of blow pipes 6 cut the slab 2 from both ends in the width direction of the slab 2 toward the center. Each blowing pipe 6 is connected to piping for supplying cutting oxygen, preheated fuel gas (usually propane gas), and combustion air. These gas supply sources 9 are mounted on the torch mount 8 a of the movable carriage 8.

  When the slab 2 is cut by the blow tube 6 of the torch cutter 4, the fume w rises and scatters from the cutting position. The fume w is a slag generated at the time of gas cutting, and is finely divided by high-pressure water. In order to prevent the fume w from scattering, in the conventional dust collector shown in FIGS. 1 and 2, the large dust collection hood 1a is provided in the entire moving range of the torch cutter 4. And the air blower was connected to the dust collection hood 1a via the dust collection duct 1b, the dust generated at the time of cutting | disconnection was attracted | sucked with the air blower, and the dust was collect | recovered with the filter cloth provided in the middle of the dust collection duct 1b. For this reason, the dust collector 1 becomes a large-scale facility and becomes expensive, and it is difficult to maintain because there is no space above the torch cutter 4.

  3 and 4 show the dust collector of this embodiment. FIG. 3 shows a side view of the dust collector of this embodiment, and FIG. 4 shows a front view of the dust collector of this embodiment (a view seen from the moving direction of the slab). Since the structures of the table 3 and the torch cutter 4 are the same as those shown in FIGS. 1 and 2, the same reference numerals are given and description thereof is omitted.

  The dust collector 11 of this embodiment is provided on the moving carriage 8 of the torch cutter 4 so that it can reciprocate in the moving direction of the slab 2 together with the torch cutter 4. The dust collector 11 includes a dust collection duct 12 that is installed on the movable carriage 8 of the torch cutter 4 via a mount 8 b, and a pipe 13 that blows air into the dust collection duct 12. The dust collection duct 12 includes a dust collection hood 12a as a suction side for sucking dust, a duct body 12b extending from the dust collection hood 12a toward the rear surface side of the torch cutter 4 (that is, upstream in the moving direction of the slab 2), and dust The outlet side 12c.

  The dust collection hood 12 a is provided only above the blow tube 6. The dust collection hood 12a has an opening with a square cross section, and the cross-sectional area of this opening decreases toward the top. Since the dust collection hood 12a is provided on the moving carriage 8, it moves in the moving direction of the slab together with the blowing pipe 6. For this reason, even if the dust collection hood 12a is downsized, it is possible to cover the moving range of the blow tube.

  A duct body 12b is connected to the upper part of the dust collection hood 12a. As shown in FIG. 3, the duct body 12 b bends in a direction parallel to the moving direction of the slab 2 from the upper part of the dust collecting hood 12 a toward the rear surface side of the torch cutter 4. The outlet side 12c of the duct body 12b is bent downward toward the sluice 14 below the table 3. Since the outlet side 12c of the duct main body 12b faces vertically downward, the dust discharged from the outlet side 12c of the duct main body 12b flows to the sluice 14 below the table 3.

  As shown in FIG. 4, the width of the slab 2 is narrower than the width of the table 3, and both sides of the slab 2 are vacant with respect to the table 3. The dust discharged from the outlet side 12c of the duct main body 12b is caused to flow to the sluice 14 below the table 3 from the space where the slabs on both sides or one side of the slab 2 do not pass. Here, when the outlet side 12c of the duct 12b is directed to a space where the slabs on both sides or one side of the slab 2 do not pass, dust can be efficiently flowed to the sluice 14. Further, in FIG. 3, the discharge is performed at the upper position, but if the outlet side 12 c of the duct 12 b is lowered to the level of the upper surface of the slab 2, the dust can be more efficiently flowed to the sluice 14. When the wind speed cannot be ensured due to restrictions such as the air volume, it is preferable to reduce it as much as possible.

  It is known that the fume w generally floats in the atmosphere for 1-2 minutes after generation, and about 0.01 μm aggregates to around 5.0 μm and scatters around. The fume w can be sent into the sluice 14 by generating a flow toward the sluice 14 due to the nature of being able to ride on the airflow. The sluice 14 has a gradient, and circulating water flows through the sluice 14. The sluice 14 is provided in order to drop the metal that was originally discharged when the gas was cut into the sluice 14, carry it out of the machine with circulating water, and process it. There is almost no ascending air flow in the sluice 14 and there is a flow to the downstream side of the sluice due to the flow of the circulating water, so that the fume w is accumulated on the downstream side of the sluice 14 without diffusing around. Since the fume w is processed together with the bare metal, it is not necessary to clean the filter cloth like a conventional dust collector.

  A pipe 13 for blowing air toward the outlet side is provided in the dust collection duct 12. A nozzle is provided at the tip of the pipe 13, and air is ejected from the nozzle toward the outlet side 12 c of the dust collection duct 12. Since air flows from the dust collection hood 12a toward the outlet side 12c, the fume w is sucked from the dust collection hood 12a by the ejector effect.

  The pipe 13 branches from a pipe for supplying combustion air to the blowing pipe 6. Since air is also supplied to the blower tube 6, it is possible to supply air to the dust collection duct 12 by branching from the air. According to this embodiment, since the dust collector 11 is comprised only with the small dust collection hood 12a, the duct main body 12b, and the branch piping 13, an installation cost becomes cheap.

  The present invention is not limited to the embodiment described above, and can be changed to various embodiments without departing from the gist of the present invention.

  For example, the dust collector of the present invention is not limited to a gas cutting device using a torch cutter, and can also be applied to a powder cutting device for cutting high chromium steel such as stainless steel. Moreover, the steel type continuously cast is not particularly limited, and can be applied to all steel types.

  In the above embodiment, the dust collection hood is not moved in the width direction of the slab together with the blow pipe in consideration of the driving capacity of the blow pipe, so that the dust collection hood is slightly larger in the width direction of the slab. However, if the dust collection hood is installed on the moving carriage of the blow tube and can be moved in the width direction of the slab in synchronization with the blow tube, dust can be collected even with a smaller dust collection hood. In addition, it is also possible to employ | adopt the fixed large dust collection hood over the whole movement range of a torch cutter similarly to the conventional dust collector.

  In the above embodiment, air is blown into the dust collecting dust and the dust is sucked by the ejector effect. However, the dust may be sucked using a blower or the like.

  The dust collecting apparatus shown in FIGS. 3 and 4 was manufactured, and the collected fume was allowed to flow through the sluice below the table. The equipment cost when manufacturing and installing the dust collector was reduced to about 1/20 of that of the conventional dust collector. Duct cleaning work by the operator was required about once a month when the dust collector was not installed, but it could be reduced to about once a year by installing the dust collector. The load on the operator was reduced.

2 ... Slab 3 ... Table 4 ... Torch cutter (cutting device)
11 ... Dust collector 12 ... Dust collector duct 12a ... Dust collector hood (the suction side of the dust collector duct)
12b ... Duct body 12c ... Dust collection duct outlet side 13 ... Pipe 14 ... Sluice w ... Fume (dust)

Claims (5)

In a dust collector of a continuous casting machine that collects dust generated when a continuously cast slab is cut by a cutting device,
A dust collection duct having a suction side for sucking dust and an outlet side for discharging dust is provided.
The suction side is arranged above the cutting device, the outlet side of the dust collection duct is directed to the sluice below the table that conveys the slab, and the dust discharged from the dust collection duct flows continuously to the sluice under the table Dust collector for casting machine.   2. The dust collecting apparatus of a continuous casting machine according to claim 1, wherein the dust collecting duct is provided in the cutting apparatus so as to be movable in the moving direction of the slab together with the cutting apparatus. The dust collector further includes a pipe installed in the dust collection duct,
The dust collection of the continuous casting machine according to claim 1 or 2, wherein dust is sucked in on the suction side of the dust collection duct by blowing air from the pipe toward the outlet side of the dust collection duct. apparatus.   The dust collecting apparatus for a continuous casting machine according to claim 3, wherein the pipe branches from a pipe for supplying air to the cutting device. In a dust collecting method of a continuous casting machine for collecting dust generated when a continuously cast slab is cut by a cutting device,
Dust is sucked in at the suction side of the dust collection duct provided above the cutting device, and discharged from the outlet side of the dust collection duct,
A dust collection method for a continuous casting machine in which the outlet side of the dust collection duct is directed to the sluice under the table that conveys the slab, and the dust discharged from the dust collection duct flows into the sluice under the table.

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