JPS6077910A - Structure of opening and closing part of flow rate regulating valve - Google Patents

Abstract

PURPOSE:To make spherical plates more compact and to reduce installation cost by constucting a flow rate regulating valve for powder of two spherical plates and convering stage-shaped notch of throat with falling preventing plate thus enabling prevention of falling of feed for a blast furnace. CONSTITUTION:The flow rate of the powder is regulated by the flow rate regulating valve 7 provided to the bottom end of a throat 15 at the bottom of a hopper 2B. Falling of the feed is prevented by falling preventing plates 26, 27 provided to cover stage-shaped notch 30 at both sides below the throat 15. The valve 7 is constituted of a valve body having two spherical plates 8A, 8B, and almost triangular or semicircular notches are provided to the spherical plates 8A, 8B. The plates are turned around a same shaft 9 to vary the area of the opening part.

Description

[Detailed Description of the Invention] Field of Application The present invention relates to the structure of a flow rate regulating valve opening/closing section.
More specifically, the present invention relates to the structure of the flow control valve opening/closing part installed at the bottom of the hopper in a furnace top charging device in which the hopper in the upper part of the blast furnace is connected to the core of the blast furnace.

BACKGROUND OF THE INVENTION As a blast furnace top charging device, a type having a rotating chute inside the blast furnace, that is, a bellless type top charging device has been put into practical use. This bell-less type furnace top charging device
As shown in Japanese Patent No. 8-34082, two hoppers 2, 2 were installed side by side in the upper part of the blast furnace 1 as shown in Fig. When charging the material into the furnace, since the vertical chute 61 from the hopper 2 is tilted, a horizontal component force is generated on the material flowing down the VL mudflow, and the tilting angle 1i of the rotating chute 3 is
Solved the problem with 〇, which was desired to be improved because even if it is closed, the raw material is not charged into the furnace in a circular shape, resulting in a distorted shape.It causes various problems in operating the blast furnace. In order to do this, a furnace top charging device was proposed in which a hopper was installed at the top of the furnace and was located between the furnace core and the furnace core. For example, in Japanese Patent Publication No. 5'7-48618, there is a type in which two hoppers in the same circular shape as the furnace core are installed at the top of the blast furnace, and a type in which hoppers 2A and 2B are installed vertically as shown in Figure 2. A furnace top charging device of the type that is stacked on top of the hopper is disclosed, and a technology is introduced in which this popper is rotated when charging raw materials into two hoppers to eliminate particle size segregation of raw materials in the circumferential direction inside the hopper. has been done. 1. Japanese Patent Application Laid-Open No. 56-8'7613 discloses that, as shown in Fig. 3, hoppers 2A and 2B are provided between the furnace core and the bottoms of the hoppers, and the surrounding area can be changed into a circular or polygonal shape around the furnace core. A bellless furnace top charging device equipped with four variable opening/closing mechanisms is disclosed. In the figure, 5 and 5A are seal valves.

In this way, by installing the hopper installed at the top of the furnace at a distance from the furnace core of the blast furnace, and by always aligning the center of the raw material flow with the furnace core when discharging raw materials from the bottom of the hopper, a bell-less type furnace top system can be installed. The charging device can now charge raw materials into the furnace evenly in the circumferential direction. Regarding the variable opening/closing mechanism 4 described in Japanese Patent Application Laid-open No. 56-81613, a highly practical device is disclosed in Japanese Utility Model Application Publication No. 5'7-114698.

That is, as shown in FIGS. 4 and 5, in the granule flow rate adjustment-yf'7 provided at the outlet of the hopper 2B, etc., the above W, the valve plate of the 1-section valve, and the Consisting of two spherical plates 8A and 8B, a portion of each spherical plate is cut out into an approximate triangular or semicircular shape with the virtual center In 10 of the hopper outlet section as one point, and these cut-out valve plates This flow control valve is characterized in that it is formed so that concentric openings can be obtained by operating the valves in opposite directions.

In the figure, 9 indicates the center axis of rotation of the spherical plates 8A and 8B.

Since this flow rate control Th14 valve 7 has a simple structure and is operated in a timely manner, it is possible to use a furnace top charging device of the type disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 56-8'7613, that is, a hopper, which is connected to the furnace core. It is being adopted in bell-less furnace top charging equipment, which is installed vertically.

However, the purpose of the invention is to use the upper and lower spherical plates 8A because this flow rate control valve is under severe usage conditions that cause severe wear.

8B is a metal with excellent wear resistance, but the range is 4o to 100711m.
Because the thickness of the spherical plates 8A and 8B must be larger than the radius of the throat outlet, the spherical plates themselves become larger, which increases the size of the casing of the valve body, which reduces equipment costs. Problems arise such as an increase in the amount of dust, an increase in the use of the equalizing pressure gas in the hopper 2B, and an increase in the amount of dust deposited.

Furthermore, since the thickness of the spherical plate is large, due to this thickness, the lower end surface of the throat that makes sliding contact with the upper spherical plate has a step-like notch of 3° as shown in FIG. 6 when viewed from the side. When the flow rate control valve is opened, the raw material protrudes from this notch 30 and rides on the side upper surface of the spherical plate, and as the valve opens and closes, the raw material on the lower spherical plate is pressed by the tip of the upper spherical plate, and the raw material is pressed into the ball. A problem arose with deposits on the rear upper surface of the faceplate. If the raw material accumulates behind the spherical plate, there is a risk of it falling off the spherical plate during the opening/closing operation of this valve, and if the spilled raw material falls onto the seal valve 5A, it may cause damage between the seal valve 5A and the seat (not shown). This causes a problem in that the raw material gets caught in between, impairing the sealing performance.

The present invention aims to advantageously solve such problems.

Structure and operation of the invention The present invention will be explained in detail based on the first box.

The flow rate control valve according to the present invention is attached to the throat 15 at the bottom of the hopper 2B as shown in FIGS. The face plate 8A, the lower spherical plate 8B, their rotation center axis 9, and the arm 20 connecting the axis and each spherical plate.
21, and a spherical plate 8A centered on the axis 9.
, 8B rotate in opposite directions, so that the raw material in the hopper 2B falls through the approximately square opening 16 formed by the upper spherical plate 8A and the lower spherical plate 8B.

Since the flow rate control valve 7 is used in the blast furnace J1 loading device, the outlet diameter of the hopper 2B to which it is attached, that is, the throat diameter 150, is quite large, with an outer diameter of about 600 to 1500 m.
/ m ), and the thickness of the valve body is also under severe abrasion usage conditions, so each spherical plate 8A, 8B has a considerable thickness (approximately 4 m).
0~100m/m).

However, the increased size and thickness of the valve body results in the casing 190 of the valve body becoming dog-shaped.

That is, as shown in FIGS. 6 and 7, a rectangular or circular opening 16 is inserted into the upper spherical plate 8 for a diameter of 150 mm.
When forming by A and lower spherical plate 8B, diagonal lines 22.23
The portions indicated by , that is, the side portions of the spherical plates 8A and 8B protrude far beyond the hopper outlet. In this case, a portion corresponding to the thickness tl of the spherical plate is also included in the protruding portion.

The present invention miniaturizes the spherical plates 8A and 8B themselves, and cuts the sides of the spherical plates 8A and 8B, and prevents spillage by preventing raw material from protruding from both sides of the lower throat due to this cutting. It is characterized by the installation of a board.

The spherical plates 8A and 8B according to the present invention are shown in FIG.
, 23 that protrudes from the throat 15 of the spherical plates 8A and 8B, that is, at 90° with respect to the opening and closing direction of both slope plates.
Both side surfaces are cut in the vertical direction with a width of tl. By making such a shape, the width of the spherical plate is significantly narrowed.Accordingly, if the diameter of the spherical plate is about 100m/m, the width of the spherical plate will be 90° relative to the opening/closing direction of the spherical plate. 50 for the direction of the ° side
It becomes possible to reduce the size by about 0 to 1000 m/m. In addition, in the opening/closing direction, the rear region of the 6-spherical plate shown by diagonal lines 24.25 in FIG. is equal to the thickness of the spherical plate, that is, if the thickness is 100 m/m, it is possible to reduce the size by about 200 m/m in the opening/closing direction of the spherical plate. FIG. 8 shows the shapes of the upper and lower spherical plates 8A and 8B after cutting the side and rear parts.

However, in the valve body cut as described above, when the flow control valve is opened to allow a predetermined flow rate to flow, since the lower spherical plate is thick, the lower spherical plate 8B and the hopper are connected by the thickness of the upper spherical plate 8A. A gap is created between the outlet throat 15 and the charging material oozes out from the gap, and the original purpose of the flow rate control valve is to discharge the material at a predetermined flow rate to the center of the hopper and eventually to the center of the furnace. This will impede that function.

The present invention provides a structure that can solve this problem in practical use.

FIG. 9 shows, as a specific example, a side view of a flow rate control valve in which a fray prevention plate 26, 2'i' is attached to an arm 21. The spill prevention plate 26.2'J attached to the arm 21 may be attached to the upper spherical plate 8A, the lower spherical plate sB, or the throat 15 of the hopper, but its height is the same as that of the lower spherical plate and the throat of the hopper. It is effective that the height is 30 to 50 m/m higher than the gap between the parts.

The radius of curvature R of the upper spherical plate 8A and the lower spherical plate 8B according to the present invention is determined to be an appropriate value in relation to the radius r of the lower end of the throw 15, and R/r is 1.4. ~2
．． It is desirable that it be within the range of 5.

R/r=1. a is the minimum radius of curvature when the thickness of the spherical plate is not considered, and in reality the thickness of each spherical plate is not negligible, so if the overlapping part is taken into account, it is 1.4
The value must be greater than or equal to 1.

Regarding the upper limit value, if R/r exceeds 2.5, the casing becomes too large and becomes unsuitable for practical use, so it is desirable to set it to 25 or less for practical equipment. Further, it is effective that the spherical plates 8A and 8B according to the present invention have a shape in which the rear part of the spherical plate protrudes from the casing with all the parts cut off when the valve is closed.

Effects of the Invention As described above, according to the present invention, each spherical plate can be made compact and the equipment elongation can be significantly reduced. 01l
There is no spillage from l [1N], and the entire amount can be discharged from the same core opening, allowing its function to be fully demonstrated. Although the present invention has been described as being installed at the bottom of the hopper of a bell-less furnace top charging device, it is installed in the vertical chute of the bell-less furnace top charging device illustrated in FIG. It is very effective when used with

[Brief explanation of drawings]

1 and 2 are sectional views illustrating a blast furnace top charging device, FIG. 3 is a sectional view illustrating a blast furnace top charging device according to the present invention, and FIGS. 4 and 5 are sectional views illustrating a blast furnace top charging device according to the present invention. FIG. 6 is a cross-sectional view illustrating the lower end of the throat according to the present invention, and FIGS. 7 and 8 are plan views illustrating the spherical plate according to the present invention. , FIG. 9 shows an embodiment of the present invention. It is a front view. 2B... Hopper 5A... Seal valve 7... Flow rate adjustment valve 8A, 8B... Spherical plate 5... Throat 16... Opening 19... Casing 21.22... Arm 26.27... Spill prevention plate 30... Notch Applicant Nippon Steel Corporation No. 4Dl Figure '5 Figure 6 Figure 7 2 Figure 8

Claims (1)

[Scope of Claims] (1) The valve body is composed of two spherical plates, each of which is a Japanese-style chamber, and each spherical plate has an approximately triangular or approximately semicircular notch, and these two spherical plates A flow control valve is provided at the lower end of the throat at the bottom of the hopper, which allows the surface arrangement of the opening of the hopper to be changed around the 7 cores of the shaft by rotating the hopper in opposite directions through the same shaft. The structure of the flow control valve opening/closing part is characterized in that the stepped notches on both sides of the throat are covered with crush prevention plates. )) The two spherical plates constituting the flow control valve have a thickness of 40' such that the ratio R/r of the radius of curvature R of the valve body and the radius r of the throat outlet is 1.4 or more and 2.5 or less. : A patent consisting of a ~100-diameter fluorescent plate, which has an outer diameter larger than the outer diameter of the lower end of the throat, and has a shape in which the protruding parts of the spherical plate on both sides parallel to the direction of rotation are cut off. A structure according to claim 1. (3) The structure according to claim 2, wherein the spherical plate has a shape obtained by cutting off the portion that protrudes from the throat at the rear of the joint venture when both slope plates are rotated in the closing direction to close the valve. . (4) The structure according to claim 2, wherein the spherical plate has a shape obtained by cutting a horizontal surface of the rear upper surface of the spherical plate. (5) The breakage prevention plate is provided on any one of the lower part of the throat, the upper spherical plate, the lower spherical plate, the arm of the upper spherical plate, and the arm of the lower spherical plate. Structure described in section.