KR20040024736A - A vacuum switching device for degassser - Google Patents

Abstract

PURPOSE: A vacuum switching apparatus for degassing facility is provided in which RH facility and VTD facility are selectively used by using one vacuum system according to steel type conditions, and RH facility, VTD facility and vacuum system are simultaneously installed at a narrow place to reduce facility investment and occupied space. CONSTITUTION: The vacuum switching apparatus for degassing facility comprises a vacuum duct(10) vertically arranged between first exhaust duct (D1) of RH (Ruhrstahl-Heraeus) facility and second exhaust duct (D2) of VTD (Vacuum Tank Degasser) facility and extended from vacuum system; moving transfer cars(20a,20b) comprising a plural traveling wheels(22) put on sliding rails(21) horizontally installed directly above the first and second exhaust ducts; a traveling motor for horizontally reciprocating the moving transfer cars along the sliding rails by rotationally driving any one traveling wheel in the plural traveling wheels in both directions; lowerable and liftable motors(32a,32b) for lowering and lifting the switching duct so that any one duct in the first and second exhaust ducts is communicated with the vacuum duct by winding or unwinding chain members(33a,33b) connected to a switching duct arranged directly above the first and second exhaust ducts; and a sensor part(40) comprising first and second limit switches(41a,41b,42a,42b) for sensing touch bar of connection plate(23) connected between the moving transfer cars so as to control driving of the traveling motor and the lowerable and liftable motors.

Description

Vacuum Switching Device for Degassing Facility {A VACUUM SWITCHING DEVICE FOR DEGASSSER}

The present invention relates to an apparatus for vacuum switching that can select and use degassing equipment such as RH equipment and VTD equipment. RH and VTD facilities can be selected and used according to the steel type conditions by using a single vacuum system to reduce the occupied space, increase facility utilization rate, improve work productivity, and respond quickly to the demands of various steel types. It relates to a vacuum switching device for gas equipment.

In general, vacuum degassing equipment is an important steelmaking equipment used to produce high quality steel by removing impurity gases such as CO, CO ₂ and H ₂ contained in molten steel and adjusting fine components.

Such vacuum degassing facilities include RH (Rheinstal Heraeus), RH-OH (Rheinstal Heraeus-Oxygen Blowing) (VHD), and VTD (Vacuum Tank Degasser). The same applies to each.

That is, the preliminary process for the operation of the RH facility, as shown in Fig. 1 (a), by melting and reducing the iron ore in the blast furnace to produce molten iron, injecting oxygen from the top, nitrogen and argon gas at the bottom of the converter In order to remove impurities by supplying blown air and supply it, it is treated with LF (Ladle Furnace) to refine molten steel in ladle to adjust temperature rise and composition required in performance equipment or RH equipment, and then ultra low carbon in RH equipment. Impurity removal to produce high grade steel is processed using vacuum system, impurities are removed, and molten steel is supplied to the casting equipment to manufacture cast steel.

As shown in FIG. 1 (b), the ladle 101 containing the molten steel pretreated in the converter is connected to the lower side of the vacuum chamber 112 by the hydraulic lifting equipment 111. At the same time as the start of the process, the exhaust gas suction input is generated by the watering pump 131, and the ejector 134 and the booster 133 of the vacuum system 130 are sequentially operated to make the vacuum chamber 112 a high vacuum condition. In operation, the gas cooler 113 connected to the vacuum chamber 122, the first exhaust duct D1 connecting the gas cooler 113 and the ejector 134, and the inside of the vacuum chamber 112 in a vacuum state. Make it. Accordingly, the molten steel in the ladle 101 is sucked by the vacuum suction input formed in the vacuum chamber 112, and blows the reflux gas to the lower side of the vacuum chamber 112 to reflux the molten steel, Degassing and removing the inclusions in the steel to achieve high purity and high purity of the molten steel, while the ferroalloy from the ferroalloy facility 140 into the ladle 101 to adjust the components of the molten steel demanded by the demand.

At this time, a large amount of dust contained in the exhaust gas generated in the process of forming the vacuum chamber 112 in a vacuum state is partially collected while passing through the gas cooler 113 is stored in the collecting box 114, the remaining dust Regardless of operation, dust and water other than gaseous components are mixed and introduced into the closed tank 139 while passing through the condenser 138 through which cooling water of a constant flow rate is injected, and the water is supplied to and treated with a water treatment facility.

On the other hand, as shown in Fig. 2 (a), the preliminary process of the VDT equipment produces the molten steel by dissolving the main raw material in the electric furnace by generating arc and electrode with the scrap and scrap as the main raw material, in the playing equipment or VTD equipment. Ladle Furnace (LF) treatment is used to refine molten steel in the ladle to adjust the required temperature rise and components, and then cast molten steel is removed from the VTD equipment using a vacuum system to the casting equipment.

In addition, as shown in FIG. 2 (b), the VTD facility 120 includes a ladle 102 containing molten steel processed in an electric furnace in the inner space of the vacuum tank 121, and the vacuum tank 121. The open upper portion of the tank cover 122 is sealed by the tank cover 122 is connected to the vacuum system 130 via the second exhaust duct D2, the watering pump at the same time as the start of the process In order to reach the high vacuum while the exhaust gas is started by the operation of the 131, the ejector 134 and the booster 133 of the vacuum system 130 are sequentially operated to operate the second exhaust duct D2 and the vacuum tank 121. In the vacuum state, the gas is injected to the lower side of the ladle 102 through the lower gas injection device. Accordingly, the molten steel in the ladle is processed by reflux of the molten steel circulation by gas injection of argon and nitrogen gas, and the high purity and high purification of the molten steel is performed by removing degassing and inclusions in the steel by vacuum.

In addition, as in the RH facility 110, the ferroalloy is input from the ferroalloy 140 to adjust the composition of molten steel as required by the demand price, and a large amount of dust contained in the exhaust gas discharged to the outside is maintained at a constant flow rate. While the cooling water is injected through the condenser 138, the dust and water other than the gaseous components are mixed and introduced into the mill tank, and the water is supplied to the water treatment facility for post-treatment.

However, in order to operate the RH facility 110 and the VTD facility 120, a vacuum system 130 including a watering pump 131, an ejector 134, a booster 133, and a condenser 138 is provided. Since the first exhaust duct (D1) and the second exhaust duct (D2) must be installed separately, respectively, the same vacuum system is installed redundantly, and the investment cost is excessively increased, and thus, the maintenance cost of the equipment is excessively increased. There was a problem in constructing the RH facility, the VTD facility, and the two vacuum systems simultaneously in a narrow space.

Therefore, the present invention has been proposed to solve the conventional problems as described above, the object of which can be used to select the RH equipment and VTD equipment according to the steel type conditions using one vacuum system, RH in a narrow place By installing equipment, VTD equipment, and vacuum system at the same time, it can reduce equipment investment cost, reduce the occupied space occupied by the whole equipment, improve work productivity by increasing facility operation rate, and respond quickly to demand of various steel grades. To provide a vacuum switching device for gas equipment.

1 (a) is a process flow diagram of a typical RH facility,

Figure 1 (b) is a block diagram showing a general RH equipment,

2 (a) is a process flow diagram of a typical VTD facility,

Figure 2 (b) is a block diagram showing a general VDT equipment,

Figure 3 is an overall configuration showing a vacuum switching device for degassing equipment according to the present invention,

Figure 4 (a) (b) is a detailed view showing the stopper and the sensor unit employed in the vacuum switching device for degassing equipment according to the present invention,

Figure 5 is a longitudinal cross-sectional view showing a vacuum switching device for degassing facility according to the present invention,

Figure 6 (a) (b) is an operating state diagram showing a vacuum switching device for degassing facility according to the present invention.

Explanation of symbols on the main parts of the drawings

10 ..... Vacuum duct 15 ..... Switching duct

19a, 19b ... Flange 20a, 20b ...

21 ..... Slide rails 22 ..... Travel wheel

23 ..... Connecting plate 31 ..... Travel motor

32a, 32b ... lifting motor 33a, 33b ... chain member

40 ..... Sensor parts 41a, 41b ... first limit switch

42a, 42b ... second limit switch 43 ..... touch bar

D1, D2 ..... 1st and 2nd exhaust duct 110 .... RH equipment

120 ..... VTD Equipment 130 .... Vacuum System

As a technical configuration for achieving the above object, the present invention,

Equipped with a RH facility that operates the converter as a whole process, a VTD facility that operates the electric furnace as a whole process, and a vacuum system that generates a constant suction power input, eliminating harmful gas components contained in molten steel and adjusting the components. In the degassing plant,

A vacuum duct disposed perpendicularly between the first exhaust duct of the RH facility and the second exhaust duct of the VTD facility and extending from the vacuum system;

A mobile trolley having a plurality of traveling wheels mounted on a slide rail installed horizontally above the first and second exhaust ducts;

A driving motor which rotates one of the plurality of driving wheels in both directions to horizontally move the moving cart along the slide rail;

Lifting and lowering the switching duct so as to allow any one of the first and second exhaust ducts to communicate with the vacuum duct by winding or unwinding a chain member connected to a U-shaped switching duct disposed directly above the first and second exhaust ducts. Lifting motors

It is provided with a vacuum switching device for the degassing facility characterized in that it comprises a sensor unit for controlling the driving of the driving, lifting and lowering motor equipped with the first and second limit switches for detecting the touch bar of the connection plate connecting the moving cart. By

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

3 is an overall configuration diagram showing a vacuum switching device for degassing facility according to the present invention, Figure 4 (a) (b) is a stopper and a sensor unit employed in the vacuum switching device for degassing facility according to the present invention. One detailed view, Figure 5 is a longitudinal sectional view showing a degassing equipment vacuum switching apparatus according to the present invention, Figure 6 (a) (b) is an operation showing the degassing equipment vacuum switching apparatus according to the present invention. State diagram.

As shown in Figs. 3 to 6, the apparatus 1 of the present invention performs the operation using the RH facility 110, which operates the converter in the previous step with one vacuum system 130, and the electric furnace, as the previous step. In order to use the VTD facility 120 freely and easily to switch the vacuum flow path, such an apparatus 1 includes a vacuum duct 10, a switching duct 15, a moving trolley 20a and 20b and a traveling motor. 31, the lifting motors 32a and 32b, the sensor unit 40, and the like.

That is, the vacuum duct 10 is provided from the first exhaust duct D1 extending from the gas cooler 113 constituting the RH facility 110 and the tank cover 122 constituting the VTD facility 120. The duct member is disposed vertically side by side between the extended second exhaust duct (D2), extending downward from the ejector 132 constituting the vacuum system 130, and then bent upward.

The upper end portions of the first and second exhaust ducts D1 and D2 and the vacuum duct 10 are disposed on the same horizontal line, are arranged side by side with the same predetermined interval, and have the same inner diameter size. A a plurality of cross-section escape prevention openings 12 are installed in the circumferential direction.

In addition, the plurality of moving trolleys 20a and 20b are mounted on the horizontal slide rails 21 which are horizontally fixed at regular intervals on the upper portions of the first and second exhaust ducts D1 and D2. It is a moving member having a traveling wheel 22, between them is integrally connected by a connecting plate 23.

Here, the stoppers 26a and 26b made of an elastic material such as urethane are fastened to lower left and right ends of the slide rail 21 to absorb shock while preventing derailment of the moving trolley 20a and 20b. Brackets 27a and 27b on 'a' cross-section are mounted to be installed as members 28a and nut members 28b, respectively, and the brackets 27a and 27b have another fastening member 29a and a nut member. By 29b, it is equipped in the left and right of the said slide rail 21. As shown in FIG.

In addition, the upper surface of the slide rail 21 is provided with a plurality of support rails (29a) orthogonally disposed thereon, and a horizontal rail (28a) is also provided on the upper surface of the support rail (29a).

In addition, the driving motor 31 rotates any one of the plurality of driving wheels 22 provided in the moving trolley 20a and 20b in a forward or reverse direction, together with the moving trolley 20a and 20b. It is a motor member provided on one side of the movable trolley 20a, 20b so as to horizontally move the connecting plate 23 assembled therebetween along the slide rail 21.

Further, the lifting motors 32a and 32b are chain members 33a respectively connected to left and right ends of the X-type switching ducts 15 disposed directly above the first and second exhaust ducts D1 and D2. The switching duct 15 is moved up and down to simultaneously form one or two of the first and second exhaust ducts D1 and D2 and the switching duct 10 so as to communicate with each other to form a vacuum flow path. The motor member is fixed to each of the moving trolley 20a, 20b so as to be.

Here, the flanges 19a and 19b are provided in the lower opening of the switching duct 15 so as to facilitate close contact with the upper ends of the first and second exhaust ducts D1 and D2 and the vacuum duct 10. ) Respectively. The chain members 33a and 33b are hooks 36a to be hooked to the hook members 36a and 36b of the connecting frames 35a and 35b respectively provided on the outer surfaces of the left and right ends of the switching hook 15. Each 36b is provided and comprised.

In addition, the sensor unit 40 is mounted on one side of the connection plate 23 and a plurality of first and second limit positions 41a and 41b for detecting the touch bar 43 which is horizontally moved. 42a) and 42b) to control the driving and driving of the elevating motors 31, 32a and 32b according to the detected signal.

The first limit switches 41a and 41b and the second limit switches 42a and 42b are fixed to a pair of left and right fixing bars 49 provided on one side of the slide rail 21, respectively. The first sensor plate 41 and the second sensor plate 42 are fixedly installed at predetermined intervals, respectively, and are electrically connected to the driving and elevating motors 31, 32a and 32b, respectively.

In addition, the front and rear ends of the touch bar 43 respectively have inclined surfaces 43a and 43b so that the first and second limit switches 41a, 41b, 42a and 42b are in contact with the detection end smoothly. Form.

The operation and effects of the present invention having the configuration as described above will be described.

First, when a vacuum degassing input generated from the vacuum system 130 is transmitted to the RH facility 110 to perform a degassing process, the driving motor 31 is operated to move the driving wheel 22 in the forward direction, counterclockwise in the drawing. In the direction of rotation driving, the running wheel 22 mounted on the slide rail 21 is rotated while rolling the moving trolley 20a, 20b together with the connecting plate 23 connecting them from the RH facility 100. It moves horizontally to the extended 1st exhaust duct D1 side.

The touch bar 43 of the connection plate 23 horizontally moved along the slide rail 21 is formed at one end of the touch bar 43 of the first limit switches 41a and 41b. When interfering with the limit switch 41b proximate to the inclined surface 43a, the forward rotational driving of the traveling motor 31 is temporarily suspended by the detection signal generated at this time.

In this case, the switching duct 15 hanging on the chain members 33a and 33b of the movable trolley 20a and 20b is also horizontally moved while the switching duct 20a and 20b is stopped. The flange portions 19a and 19b formed at the lower opening of the 15 are disposed in a substantially one-to-one correspondence with the second exhaust duct D1 of the RH facility 110 and the vacuum duct 10 of the vacuum system 130, respectively. do.

Successively, the moving trolley 20a, 20b and the connecting plate 23, which were traveling in one direction, were pushed slightly in the advancing direction by the inertia force, and the inclined surface 43a of the touch bar 43 and the first limit switch ( The remaining limit switches 41a of 41a and 41b interfere with each other, and the lifting and lowering motors 32a and 32b are simultaneously released by the detection signal generated so that the chain members 33a and 33b are released. do.

At this time, the amount of loosening of the chain members 33a and 33b is measured by measuring means such as a cam switch and PLG provided on the drive shaft to detect the rotational driving amount of the lifting motors 32a and 32b. It is controlled by the controller receiving it.

In this case, the switching duct 15 corresponding to the second exhaust duct D1 of the RH facility 110 and the vacuum duct 10 of the vacuum system 130 in a substantially vertical direction descends downward. While the flanges (19a) (19b) and the upper end of the first exhaust duct (D1) and the vacuum duct 10 formed on the lower left and right ends are in close contact with each other, the flanges (19a, 19b) O-ring tightly seals the contact area.

Accordingly, when the water suction pump 131 of the vacuum system 130 is driven to transmit the vacuum suction input to the vacuum duct 10 through the ejector 134 and the booster 133, the vacuum duct 10 and Since the vacuum suction input is transmitted to the lower part of the vacuum chamber 112 of the RH facility 110 through the first exhaust duct D1 connected through the switching duct 15, the molten steel in the ladle 101 is sucked up. At the same time, the molten steel component is adjusted while supplying reflux gas under the ladle 101 while refluxing to achieve high purity and high purification of the molten steel.

On the other hand, when the degassing process is to be performed in connection with the vacuum system 130 in conjunction with the VTD facility 120, the driving of the watering pump 131 is stopped, and all the operations in the RH facility 110 are completed. In the stopped state, when the operator of the cab drives the elevating motors 32a and 32b at the same time as the button operation of the control panel and pulls up the chain members 33a and 33b simultaneously, the first of the RH facility 110 is operated. The switching duct 15, which has a pair of lower openings communicating with the exhaust duct D1 and the vacuum duct 10, respectively, is lifted to the upper portion and spaced apart from the duct members D1 10.

When the winding amount of the chain members 33a and 33b is sufficiently spaced apart between the switching duct 15 and the duct members D1 and 10, the lifting motor 32a ( The winding operation of 32b) is stopped, and at the same time, power is applied to the driving motor 31 to rotate it in the reverse direction as opposed to the above.

In this case, the driving wheels 22 of the moving trolleys 20a and 20b are rotated in the reverse direction, clockwise in the drawing, and start to move horizontally along the slide rail 21 to the right in the drawing. The duct 15 is also horizontally moved.

Continuously, when the inclined surface 43b of the touch bar 43 mounted on the horizontally moving connecting plate 23 interferes with the second limit switches 42a and 42b, respectively, the traveling motor ( 31, the movable trolleys 20a and 20b are stopped by driving stops of the flanges 19a, 19b and the VDT facilities 120 formed in the lower openings on the left and right sides of the switching duct 15, respectively. After the double duct D2 and the vacuum duct 10 of the vacuum system 13 correspond to each other, the unloading drive of the lifting motors 32a and 32b is simultaneously performed, and the chain connected to the switching duct 15 The members 33a and 33b are released to closely contact the flange portions 19a and 19b of the switching duct 15 to the upper ends of the vacuum duct 10 and the second exhaust duct D2, respectively.

In this state, by driving the watering pump 131 of the vacuum system 130 to transfer the vacuum suction input to the vacuum duct 10 through the ejector 134, the booster 133, the vacuum duct 10 And a vacuum suction input is transferred into the vacuum tank 121 of the VTD facility 120 through the second exhaust duct D2 of the VTD facility 120 connected in communication with the switching duct 15. The molten steel of the ladle 102 accommodated in 121 is refluxed by gas injection to achieve high purity and high purification of the molten steel, and to adjust the molten steel component.

According to the present invention as described above, the vacuum duct of the vacuum system is vertically disposed between the first exhaust duct extending from the RH facility and the second exhaust duct extending from the VTD facility, and the upper portion is reciprocated and With the lowering switching duct, it is possible to selectively supply vacuum force to the RH and VTD equipment using one vacuum system to perform degassing and composition adjustment. Therefore, RH is not limited to a small installation space. By constructing equipment, VTD equipment, and vacuum system in the same place, it can reduce equipment investment cost, significantly improve work productivity by increasing equipment operation rate, and produce various kinds of steel quickly to meet the demand of various demands. Is obtained.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to clarify that knowledge is easy to know.

Claims (4)

Harm included in molten steel with RH facility 110 for operating the converter as a whole process, VTD facility 102 for operating the furnace as a whole process, and vacuum system 130 for generating a constant suction strength input In the degassing apparatus which removes a gas component and adjusts a component, The vacuum duct 10 vertically disposed between the first exhaust duct D1 of the RH facility 110 and the second exhaust duct D2 of the VTD facility 120 and extending from the vacuum system 130. ; Moving trolleys (20a) (20b) having a plurality of traveling wheels (22) mounted on a slide rail (21) installed horizontally above the first and second exhaust ducts (D1) (D2); A driving motor 31 for horizontally moving the moving trolley 20a and 2b along the slide rail 21 by rotating one of the plurality of driving wheels 22 in both directions; Winding or unwinding the chain members 33a and 33b connected to the U-shaped switching duct 15 disposed directly above the first and second exhaust ducts D1 and D2, the first and second exhaust ducts D1. Lifting motors 32a and 32b for raising and lowering the switching duct 15 to communicate any one of (D2) and the vacuum duct 15 with each other; The first and second limit switches 41a, 41b, 42a, 42b for detecting the touch bar 43 of the connecting plate 23 connecting the moving trolley 20a, 20b, the driving, A degassing facility vacuum switching device comprising a sensor unit (40) for controlling the driving of the elevating motor (31) (32a) (32b). The method of claim 1, On the lower left and right ends of the slide rail 21, stoppers 26a and 26b made of an elastic material such as urethane may be respectively installed to absorb shock while preventing derailment of the moving trolley 20a and 20b. Degassing equipment vacuum switching device, characterized in that for mounting a bracket (27a) (27b) on the 'b' cross-section. The method of claim 1, The lower openings of the switching ducts 15 are provided with flange portions 19a and 19b to facilitate close contact with the upper ends of the first and second exhaust ducts D1 and D2 and the vacuum duct 10. Vacuum switching device for degassing facility, characterized in that each forming. The method of claim 1, The front and rear ends of the touch bar 43 respectively form inclined surfaces 43a and 43b so that the first and second limit switches 41a, 41b, 42a and 42b are in contact with the detection end smoothly. Vacuum switching device for degassing equipment characterized in that.