JP2005169445A - Straight flow type flow rate control apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the development of turbulent flow of an opening hole part caused by the collision of molten metal against a lower nozzle by adjusting the opening hole parts of a slide plate and the lower nozzle so as to form as straight flow when molten metal is made to flow down at the opening hole parts. <P>SOLUTION: In a sliding nozzle apparatus constituted of a fixed plate in contact with an nozzle disposed at the bottom part of a vessel for holding the molten metal, the slide plate and the lower nozzle in connection with this slide plate, the straight flow type flow rate control apparatus for molten metal is provided with a straightening plate constituted of the following members disposed between the fixed plate and the slide plate. The above members are (a) a first control plate arranged so as to be slidable for adjusting the opening area in the opening hole part between the fixed plate and the slide plate and a second control plate disposed so as to be faced to the first control plate, and (b) two pieces of pushing plates disposed so as to interpose from both sides of the first and the second control plates which are slidable. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a flow rate control device for controlling the flow rate of molten metal.

  When the molten steel is poured out from a ladle or tundish, a sliding nozzle (hereinafter abbreviated as SN) is used as a flow control device. The SN will be described with reference to FIG. The SN in FIG. 4A is provided at the bottom of a ladle, for example, and is provided to adjust the molten steel flow rate. SN is composed of a refractory material and includes an upper nozzle 51 for discharging molten steel. The upper nozzle 51 has, for example, a substantially conical opening 56.

  Below the upper nozzle 51, for example, a fixed plate 52 having a columnar opening 57 is provided for flowing molten steel. Below the fixed plate 52, a slide plate 54 that is made of a refractory material and has a columnar opening 59, for example, is provided for flowing molten steel. The slide plate 54 is slidable left and right. In FIG. 4A, the opening 57 is closed by the slide plate 54, and the molten steel is not discharged.

  In order to flow molten steel made of a refractory material under the slide plate 54, for example, a lower nozzle 55 having a substantially cylindrical opening 60 is provided in the center, and the molten steel is discharged from the lower nozzle 55. The The lower nozzle 55 is often equipped with a long nozzle for air sealing or an immersion nozzle for continuous casting.

  FIG. 4B shows a state in which the slide plate is displaced and the opening 56 of the upper nozzle 51, the opening 57 of the fixed plate 52, the opening 59 of the slide plate 54, and the opening 60 of the lower nozzle 55 communicate with each other. In this state, molten steel is discharged.

Japanese Patent Laid-Open No. 5-277678 discloses an upper fixing plate for a sliding gate for controlling the flow rate of molten metal in a continuous casting facility so as not to cause a drift in the immersion nozzle when the gate opening is changed. In this example, the sliding plate interposed between the lower fixing plate and the lower fixing plate is divided into two so as to be movable toward and away from each other.
JP-A-5-277678

  By the way, such a method has the following problems. Usually, when molten steel is poured out, the flow rate is controlled by the opening area of the opening 57 of the fixed plate 52 and the opening 59 of the slide plate 54. That is, when reducing the flow rate, the slide plate is shifted to reduce the area of the opening, and when increasing the flow rate, the slide plate is shifted and the opening 57 of the fixed plate 52 and the opening of the slide plate 54 are shifted. If 59 is overlapped, the maximum opening area is obtained and the maximum flow rate is obtained.

  However, when the flow rate is adjusted by adjusting the opening area between the opening 57 of the fixed plate 52 and the opening 59 of the slide plate 54 as described above, there are the following problems.

(1) Since the opening area is adjusted by shifting the integrally formed slide plate, if the opening is widened from the state where the opening is closed with the slide plate, the molten metal flowing from the opening to the lower nozzle is opened. It flows down diagonally from the part.
(2) The molten metal flowing down in the oblique direction collides with the lower nozzle and flows down in the lower nozzle in the opposite oblique direction.
(3) An opening may occur at the location where the molten metal collides in the lower nozzle due to wear erosion of the lower nozzle.

(4) In addition, when connecting a long nozzle to the lower nozzle, a seal material is used to seal the nozzles together to prevent air from entering, but the seal may loosen due to the collision of the molten metal, resulting in an opening. .
(5) When an opening is generated, air flows into the nozzle through the opening. Then, the quality of the molten metal is deteriorated due to gas components in the atmosphere, moisture, and the like.

  The present invention is for solving the above-described problems, and adjusts the opening between the slide plate and the lower nozzle so that the molten metal rectifies when flowing down the opening, and collides with the lower nozzle. This eliminates the occurrence of an opening due to.

In order to solve the above-described problems, a first aspect of the present invention is a fixed plate that contacts an upper nozzle disposed at the bottom of a container that contains molten metal, a slide plate, and a lower nozzle connected to the slide plate. A rectifying flow rate control for molten metal, comprising a rectifying plate comprising the following members disposed between the fixed plate and the slide plate: Device.
(A) a first control plate slidably provided to adjust an opening area of the opening between the fixed plate and the slide plate, and disposed so as to face the first control plate. A second control board installed;
(B) Two pressing plates disposed so as to sandwich the first and second control plates from both sides so that the first control plate and the second control plate can slide.

  According to the second aspect of the present invention, each control is performed so that the opening shape when the first control plate and the second control plate are moved in opposite directions to be opened is a square or a rhombus. It is a rectifying flow control device for molten metal, characterized in that the opposite ends of the plates are formed.

  According to a third aspect of the present invention, the front ends of the control plates facing each other when the first control plate and the second control plate are closed are positioned at the center of the opening of the sliding plate of the sliding nozzle. A rectifying flow rate control device for molten metal, wherein the one control plate and the other control plate are disposed.

  According to a fourth aspect of the present invention, the first control plate and the second control plate are moved in opposite directions to move the first control plate and the second control plate so as to form an opening of an arbitrary size. A rectifying flow control device for molten metal, characterized in that means is provided.

  According to a fifth aspect of the present invention, there is provided a rectifying flow rate controller for molten metal, wherein the molten metal container is a ladle or a tundish.

  According to a sixth aspect of the present invention, there is provided a rectifying flow rate control apparatus for molten metal, wherein the molten metal is molten steel or molten iron.

  By providing a flow rate adjusting plate in SN, rectification of the molten metal was obtained. Therefore, the molten metal that has flowed down does not collide with the lower nozzle and an opening is not generated. When a long nozzle is connected to the lower nozzle, the seal portion can be made smaller. In addition, the atmosphere does not flow in from the opening and the quality of the molten metal is no longer lowered, extending the life of the refractory and improving the steel quality.

  Embodiments of the present invention will be described with reference to FIGS. SN21 of Fig.1 (a) is provided, for example in bottom parts, such as a ladle, and is provided in order to adjust a molten steel flow rate. SN21 is made of a refractory material and has an upper nozzle 1 in the center for flowing molten steel. The upper nozzle 1 has, for example, a substantially conical opening 6. On the lower side of the upper nozzle 1, for example, a fixed plate 2 having a columnar opening 7 in the center is provided for flowing molten steel.

  On the lower side of the fixed plate 2. It is made of a refractory and has a flow rate control plate 3 for controlling the flow rate of molten steel. The flow rate control plate 3 has a function of adjusting the opening degree of the opening 8. Below the flow rate control plate 3, for example, a slide plate 4 having a cylindrical opening 9 is provided for flowing molten steel. The slide plate 4 is slidable left and right. In FIG. 1 (a), the flow control plate opening 8 is in a closed state, and the flow control plate opening 8 and the fixed plate opening 7 are closed by the slide plate 4, so that the molten steel does not flow. is there.

  In order to allow molten steel to flow through the lower side of the slide plate 4, for example, a lower nozzle 5 having a substantially columnar opening 10 is provided at the center. Molten steel is discharged from the opening 10 of the lower nozzle 5. The lower nozzle 5 may be connected to a long nozzle for air sealing.

  FIG. 1B shows an opening 6 of the upper nozzle 1, an opening 7 of the fixed plate 2, an opening 8 of the flow rate control plate 3, an opening 9 of the slide plate 4, and an opening 10 of the lower nozzle 5. Since the flow control plate opening 8 is in a fully open state, the molten steel flows out fully.

  FIG. 2 is a plan view of the flow rate control plate of the present invention. FIG. 2A shows a state in which the opening 8 of the flow rate control plate 3 is closed. The flow rate control plate 3 is slidably provided to adjust the opening area of the opening 8 and is also slidable to adjust the opening area of the opening 8. The right control plate 34 is disposed.

  Further, on the upper side of the drawings of the control plate 33 and the control plate 34, a pressing plate 31 for pressing the control plates 33, 34 is provided so that the control plates 33, 34 can slide smoothly left and right. Similarly, a pressing plate 32 that presses the control plates 33 and 34 is provided below the control plate 33 and the control plate 34 so that the control plates 33 and 34 can slide smoothly left and right. What is necessary is just to select suitably the material of a control board or a press board, a magnitude | size, a shape, etc. according to the temperature to be used, the kind of molten metal, etc., for example.

  The flow rate is controlled by opening and closing the control plate, for example, as follows. That is, as shown in FIG. 1B, the slide plate is made of the opening 6 of the upper nozzle 1, the opening 7 of the fixed plate 2, the opening 8 of the flow rate control plate 3 in the opened state, and the opening of the slide plate 4. 9, the lower nozzle 5 is in a state where the opening 10 communicates, and then, or simultaneously, the control plates 33 and 34 shown in FIG. 2 (a) are closed as shown in FIG. 2 (b). The openings 8 may be gradually opened by sliding the control plates 33 and 34.

  In order to adjust the flow rate in the case of FIG. 1B, the control plates 33 and 34 are slid in the direction facing each other, and the degree of opening and closing of the opening 8 of the flow rate control plate is adjusted. That is, the flow rate can be adjusted by sliding the control plates 33 and 34 in a facing direction and covering the circular opening 9 of the slide plate 4 to widen or narrow the opening. At the end, the operation is reversed. That is, the open / close plates 33 and 34 may be closed as shown in FIG. 2A, and then the slide plate may be closed as shown in FIG.

  In order to control the flow rate by opening and closing the control plate, it can also be performed as follows. That is, as shown in FIG. 1B, the slide plate is made of the opening 6 of the upper nozzle 1, the opening 7 of the fixed plate 2, the opening 8 of the flow rate control plate 3 in the opened state, and the opening of the slide plate 4. 9, the lower nozzle 5 is in a state where the opening 10 communicates, and then, or simultaneously, the control plates 33 and 34 shown in FIG. 2 (a) are closed as shown in FIG. 2 (b). The control plates 33 and 34 are slid to gradually open the opening 8.

  In order to adjust the flow rate, the control plates 33 and 34 are slid in the direction facing each other, and the degree of opening and closing of the opening 8 of the flow rate control plate is adjusted. At the end, as shown in FIG. 2 (a), the open / close plates 33 and 34 are simply closed, and the position of the slide plate remains as shown in FIG. 1 (b) as shown in FIG. 1 (b).

  In addition, when the control plates 33 and 34 are slid and the opening is closed, it is desirable that the tip position of each control plate and the center position of the opening of the slide plate are aligned. In order to allow molten steel to flow evenly during casting, it is desirable to open and close the control plates so that the left and right dimensions are equal at the same speed. The sliding directions of the control plates 33 and 34 may be the same as the sliding direction of the slide plate 4 as shown in FIG. The direction suitable for the work can be selected as appropriate.

  The shape of the opening 8 formed between the tip of the control plate 33 and the tip of the control plate 34 will be described below. In the example of FIG. 2, the front ends of the control plates 33 and 34 are formed perpendicular to the traveling direction of the control plate, and the shape of the opening 8 is rectangular. The shape of the opening 8 may be inclined so that the shape of the opening is a rhombus without making the tip vertical. Alternatively, one may be formed in a semicircular convex shape and the other in a semicircular concave shape, and when the tips of the two are aligned, they may be formed so as to fit in each other's semicircular portions. As long as the molten steel passing through the control plate can be prevented from causing turbulent flow, the shape of the butt surface can be arbitrarily set.

  Further, as shown in FIG. 1B, the opening 7 of the fixed plate 2 and the opening 8 of the flow rate control plate 3 are fully opened, and the opening area formed by the opening 9 of the slide plate 4 is not fully opened. Even when the molten metal is allowed to flow out in the state of being squeezed in advance, the control plates 33 and 34 may be slid in the direction facing each other as described above to close the opening 9 of the slide plate. That is, by sliding the control plates 33 and 34 in the facing direction and covering the circular opening 9 of the slide plate 4, for example, the opening can be narrowed to adjust the flow rate. In the case of increasing the number, the opening may be widened.

  FIG. 3 shows another form of the flow rate control plate. FIG. 3A shows an example in which the control plates 43 and 44 are symmetrically formed between the pressing plates 41 and 42 so as to collide with each other in the form of a hook and are closed. FIG. 3B shows a state in which the control plates 43 and 44 are slid and opened. Thus, when the control plates 43 and 44 are formed, when the control plate is slid to open and close, the metal plate fixed to the control plate is easily opened and closed using, for example, a cylinder or the like.

  Thus, by providing the control plate 3, the flow rate can be finely adjusted as compared with the conventional method of adjusting the opening area between the opening 7 of the fixed plate 2 and the opening 9 of the slide plate 4. Moreover, since the molten metal flows vertically down the central portion, the flow of the molten metal can be rectified.

  In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can be appropriately changed as necessary without departing from the scope of the invention.

  The SN as shown in FIG. 1 was attached to the bottom of the pan, and the number of times the SN was used, the accident rate of the lower nozzle, and the surface quality were examined over a month. An SN having a diameter of 80 mm and a stroke of 200 mm was used.

  As a result of the investigation, when the SN of the present invention was used, the SN could be used repeatedly 8 times. Moreover, the number of accidents where the lower nozzle was perforated was zero, and the oxygen level in the steel could be reduced. On the other hand, when the conventional SN was used, the number of repeated uses did not exceed 5 times. The lower nozzle hole accident was 0.6%, and the oxygen level in the steel was high.

  The molten metal that has flowed down collides with the lower nozzle, so that no opening is generated. When a long nozzle is connected to the lower nozzle, the seal portion can be made smaller. In addition, since the atmosphere does not flow from the opening and the quality of the molten metal is not lowered, the life of the refractory can be extended, and the steel quality is improved.

It is the schematic of SN which attached the flow volume adjustment board of this invention. It is an example of one form of this invention flow control board. It is another example of a form of this invention flow control board. It is the schematic of conventional SN.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper nozzle 2 Fixed plate 3 Flow control plate 4 Slide plate 5 Lower nozzle 6 Opening part 7 Opening part 8 Opening part 9 Opening part 10 Opening part 21 SN (sliding nozzle)
31 Press Plate 32 Press Plate 33 Control Plate 34 Control Plate 41 Press Plate 42 Press Plate 43 Control Plate 44 Control Plate 50 SN (Sliding Nozzle)
51 Upper nozzle 52 Fixed plate 54 Slide plate 55 Lower nozzle 56 Opening portion 57 Opening portion 59 Opening portion 60 Opening portion

Claims (6)

A sliding nozzle device comprising a fixed plate in contact with an upper nozzle disposed at the bottom of a container containing molten metal, a slide plate, and a lower nozzle connected to the slide plate, the fixed plate and the slide A rectifying flow rate control device for molten metal, comprising a rectifying plate composed of the following members disposed between the plates.
(A) a first control plate slidably provided to adjust an opening area of the opening between the fixed plate and the slide plate, and disposed so as to face the first control plate. A second control board installed;
(B) Two pressing plates disposed so as to sandwich the first and second control plates from both sides so that the first control plate and the second control plate can slide.   The front end of each control plate is formed so that the opening shape when the first control plate and the second control plate are moved in opposite directions and opened is a square or a rhombus. The rectifying flow rate control device for molten metal according to claim 1.   The one control plate and the other control plate are positioned so that the opposing tips of the control plates when the first control plate and the second control plate are closed are located at the center of the opening of the sliding plate of the sliding nozzle. The rectification type flow control device for molten metal according to claim 1, wherein a control plate is provided.   In order to adjust the flow rate by moving the first control plate and the second control plate in opposite directions, there is provided driving means for moving the first control plate and the second control plate so as to form an opening of an arbitrary size. The rectification type flow control device for molten metal according to any one of claims 1 to 3.   The rectifying flow rate control device for molten metal according to any one of claims 1 to 4, wherein the molten metal container is a ladle or a tundish.   The rectifying flow control device for molten metal according to any one of claims 1 to 5, wherein the molten metal is molten steel or molten iron.

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