JP2586608Y2 - Seal valve structure for raw material loading inlet of melting furnace - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal valve structure for a raw material charging inlet of a melting furnace.

[0002]

2. Description of the Related Art In a melting furnace for melting metal, slag, etc. using electric power, gas, coke, coal, etc. as a heat source, it is generally necessary to prevent air from entering the furnace in order to protect the refractory inside. For this reason, a seal valve is generally provided in the opening for charging the raw material. In addition, since these seal valves are exposed to a high-temperature atmosphere in a furnace, a water-cooled structure is usually employed.

[0003] For example, rock wool is produced by melting its raw material in an electric melting furnace, and blowing the melted product with a cotton mill or spinning. As shown in FIG. 6, in the electric melting furnace 1, a plurality of electrode rods 19 penetrating a furnace lid 1b covered on a furnace body 1a are inserted into the furnace so as to be able to move up and down. Also furnace lid
Dissolved slag such as blast furnace slag, which is a main raw material of rock wool, is introduced into the furnace from a raw material charging port 2 provided in 1b by a slag pot 18. A seal valve 3 is provided in the middle of the raw material charging port 2 to prevent air from entering the electric melting furnace 1 as described above.

In such a conventional seal valve 3, a valve element 4 disposed in a valve box 12 as shown in a plane in FIG. 7 is rotatable about a vertical axis 8 for rotation via a support arm 13. Fixed. A drive arm 16 is fixed above the vertical shaft 8, and the other end of the drive arm 16 is connected to a piston shaft 17 a of a cylinder 17. When the cylinder 17 expands and contracts, it revolves and reciprocates in the valve box 12 between a position where the raw material charging port 2 is closed and a release position indicated by a broken line.
The vertical shaft 8 for rotation is rotatably supported by upper and lower bearings 15 and 15 'fixed to the valve box 12.

FIG. 8 is a detailed sectional view taken along the line AA in FIG. As shown in FIG.
And the castable refractory 6. When the castable refractory 6 inside the furnace is on the lower pipe seat 14 a forming the raw material inlet 2, the seal valve 3 is closed. As shown in FIG. 9, a hose 7 for supplying and discharging cooling water is connected to the water cooling jacket 5 on the outside of the furnace, and the other end of the hose 7 is connected to a communication hole 9 provided in a vertical shaft 8 for turning. Connected. A hose 11 is connected to a pipe 10 attached to the upper surface of the vertical shaft 8 and connected to the communication hole 9.

The cooling water supplied from one supply-side hose 11 passes through a supply-side pipe 10, and is supplied to a water-cooling jacket 5 through a supply-side communication hole 9 provided in a vertical shaft 8 for turning and a hose 7. Supplied to The cooling water supplied to the water-cooling jacket 5 passes through the water-cooling jacket 5 and cools the valve body 4 while being guided by the partition plate 4 a provided in the water-cooling jacket 5. Is discharged through another communication hole 9 through a pipe 10 and a hose 11 on the discharge side.

As described above, the valve body 4 is connected to the water cooling jacket 5.
Since it is constituted by the castable refractory 6, even when the valve element 4 is at the position where the raw material inlet 2 is closed, it can withstand high temperatures in the furnace of the electric melting furnace 1.

[0008]

The conventional seal valve structure has the following problems. The hose 7 connected to the water-cooling jacket 5 is generally screwed in, and the hose 7 leaks from the connection portion due to long-time use or the hose 7 due to a high-temperature atmosphere.
Leakage is likely to occur due to the deterioration of the material.

Since the valve element 4 is used in a high temperature atmosphere,
Although the life of the valve element 4 is short, the vertical axis 8
It is necessary to remove the hose 7 before pulling out. However, the upper surface of the electric smelting furnace 1 is generally in a high-temperature atmosphere and other auxiliary facilities are densely packed, and work from the pipe seat 15 provided in the valve box 12 is impossible. Therefore, it is necessary to remove the seal valve 3 integrally. However, since the seal valve 3 has a large shape and is operated in a high-temperature atmosphere, the operation itself is extremely difficult and requires a long time.

The present invention provides a seal valve structure for a raw material loading inlet of a melting furnace in which only a small amount of water leakage occurs and only the valve element 4 can be easily replaced on the melting furnace in order to solve the above-mentioned drawbacks. The purpose is to do so.

[0011]

Means for Solving the Problems The present invention for achieving the above object, is fixed via a support arm 13a on the vertical axis 8 for pivoting and a valve body 4 having a water cooling jacket 5, the valve body 12 In a seal valve structure for a raw material charging port of a melting furnace in which the raw material charging port 2 is opened and closed by being supported by upper and lower bearings 15 and 15 ′ so as to be freely rotatable in a horizontal direction, the rotating vertical shaft 8 is connected to the vertical shaft 8 . , it is fitted to the upper bearing 15 and drive Doa over arm 16
Is divided into three parts: an upper shaft 8a to which the valve shaft 4 is fixed, a middle shaft 8b to which the valve body 4 is fixed via a support arm 13a, and a lower shaft 8c fitted to the lower bearing 15 '. 8a, the bonding surfaces of the central shaft 8b and the lower shaft 8c is a raw material charging hole seal valve structure of a melting furnace, characterized in that axial rotation torque is a fitting structure of possible irregularities transmission.

In the present invention described above, the central shaft (8
Water cooling jacket (5) of valve body (4) on b) and support arm (13a )
It is preferable to provide a communication hole (9) leading to and before
An opening (2 ) through which a pipe (10) for supplying and discharging cooling water passes through the upper shaft (8a)
0) is preferably provided.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction and operation of the present invention will be described below in detail based on embodiments. FIG. 1 is a longitudinal sectional view showing the structure of the present invention, which corresponds to the conventional structure shown in FIG. 8, and the same components as those shown in FIG. . As explained with reference to FIG. 8, since conventionally the vertical shaft 8 for turning the valve body 4 is integral structure through an arm 13, but it was difficult to exchange work on any valve body 4, the In the invention, the vertical axis for turning is driven as shown in FIG.
Doa over arm 16 integral with the upper shaft 8a, it is to basically to 3 divided structure to the central axis 8b and the lower shaft 8c which is integral with the valve body 4 through the support arm 13a.

[0014] That is to fix the drive Doa over-time 16 upper shaft 8
a is fitted to the upper bearing 15, the valve body 4 is fixed to the middle shaft 8b via the support arm 13a, and the lower shaft 8c is fitted to the lower bearing 15 '. . And the upper shaft 8a, aperture 20 in the vertical direction in order to pass the tube 10
(See FIG. 4). The middle shaft 8b and the support arm 13a are provided with a communication hole 9a (see FIG. 2), and one end of the communication hole 9a communicates with the water cooling jacket 5 and the other end communicates with the upper shaft 8a. It is connected to a pipe 10 arranged so as to pass through an opening 20 provided. The water cooling jacket 5 is partitioned by a partition plate 4b to form a cooling water passage.

As shown in FIG. 3, the lower surface of the upper shaft 8a and the upper surface of the middle shaft 8b are connected to each other by a polygonal fitting portion (square in the figure) 21 with the concave portion of the upper shaft 8a and the convex portion of the middle shaft 8b. They are fitted and connected so that rotational torque can be transmitted. The lower surface of the middle shaft 8b and the upper surface of the lower shaft 8c are shown in FIG.
As shown in the figure, the convex portion of the middle shaft 8b and the concave portion of the lower shaft 8c are fitted by a polygon fitting portion (hexagon in the figure) 22 and are similarly connected so as to be able to transmit rotational torque. .

The valve body 4 of the seal valve 3 according to the present invention has the above-described structure, but the upper shaft 8a and the middle shaft 8b are polygonal fitting portions 21, and the middle shaft 8b and the lower shaft 8c are connected to each other. Are connected by fitting at the polygonal fitting portions 22, so that the turning torque by the operation of the cylinder 17 is transmitted integrally with the conventional turning shaft 8 as in the case of the conventional turning shaft 8, and the raw material loading port 2 is turned by turning the valve element 4. Can be opened and closed.

The cooling water supplied from the pipe 10 provided in the opening 20 provided in the upper shaft 8a can be guided to the water cooling jacket 5 through the communication hole 9a provided in the middle shaft 8b and the arm 13a. it can. For this reason, since there is no place that is vulnerable to water leakage unlike the conventional hose 7, a structure that is durable against water leakage can be provided. When the valve body 4 is replaced for repair, the hose 11 and the pipe 10 are first detached from the central shaft 8b, then fitted on the bearing 15 and fitted on the central shaft 8b by the polygonal fitting portion 21. Pull out the upper shaft that is being used. Next, since the central shaft 8b, the support arm 13a, and the valve body 4 are integrated, if the central shaft 8b is lifted beyond the fitting margin of the polygonal fitting portion 22 with the lower shaft 8c, the central shaft 8b is disengaged from the lower shaft 8c. br />

At this stage, the valve body 4 can be pulled out in the lateral direction. In order to pull out the valve element 4, it is necessary to make the side surface of the valve box 12 (for example, the left or right side surface in FIG. 7) openable. Subsequently, if the lower shaft 8c fitted to the lower bearing 15 'is pulled upward, a series of removing operations is completed. When the lower shaft 8c, the middle shaft 8b, and the upper shaft 8c are mounted in the valve box 12, the above procedure may be reversed. Although FIGS. 3 and 5 show an example in which the upper shaft 8a and the lower shaft 8c arranged above and below the middle shaft 8b are fitted into a square and a hexagon, other polygons, key shapes, and splines are used. well the unevenness of the relationship in any shape or the like may be reversed. It goes without saying that the present invention can be used for various melting furnaces other than the electric melting furnace.

[0019]

As described above, according to the present invention, the following effects can be obtained. (1) Since the life of the seal valve is extended, the airtightness of the melting furnace is ensured for a long time, and the operating rate of the furnace is improved. (2) Since the water supply / drain route to the valve body is a communication hole provided in an arm integrated with the valve body, water leakage in a high-temperature atmosphere can be reliably prevented.

(3) Since the swiveling shaft is divided, even if the valve is damaged, only the valve can be easily replaced on the melting furnace.
The replacement work time can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a seal valve structure for a raw material charging inlet of a melting furnace according to the present invention.

FIG. 2 is a cross-sectional view taken along the line cc of FIG. 1;

FIG. 3 is a cross-sectional view taken along a line dd in FIG. 1;

FIG. 4 is a sectional view taken along the line ee in FIG. 1;

FIG. 5 is a cross-sectional view taken along the line ff in FIG. 1;

FIG. 6 is a sectional view showing an electric melting furnace.

FIG. 7 is a plan view showing a seal valve structure for a raw material charging inlet of a conventional melting furnace .

8 is a cross-sectional view taken along the line AA of FIG.

FIG. 9 is a cross-sectional view taken along the line BB of FIG. 8;

[Explanation of symbols]

1 electric melting furnace 2 feed spout 3 sealed valve 4 valve body 5 water cooling jacket 6 castable 7 Hose 8 vertical axis 9, 9a communicating hole 10 tube 11 the hose 12 valve body 13,13a supporting arms 14, 14a tube seat 15, 15 'Bearing 16 Drive arm 17 Cylinder 18 Slag pan 19 Electrode rod 20 Opening 21 Polygon fitting part 22 Polygon fitting part

Claims (3)

(57) [Scope of request for utility model registration] 1. A vertical axis for turning.(8)To support arm(13a)
Fixed throughAndWater cooling jacket(Five)Valve body with
(Four)To,Valve box(12)Bearings arranged above and below(15, 15 ')Water
So that it can be turned freely in the horizontal direction.materialEntrance(2)Open and close
Of the melting furnacematerialOdor seal valve structure
And the vertical axis for turning(8)The upper bearing(15)Fit into
IsAndDriveMovementHome(16)Fixed upper shaft(8a)And support
arm(13a)Through the valve body(Four)Middle shaft with fixed(8b)
And the lower bearing(15 ')Lower shaft fitted to(8c)And 3 minutes
Split the above upper axis(8a), Central shaft(8b)And lower shaft(8c)
The mating surfaces of the joints are fitted with irregularities that can transmit shaft rotation torque.
Of melting furnace characterized by having structurematerialSea for charging entrance
Le valve structure. 2. A according to claim 1, characterized in that a water cooling jacket communicating hole leading to the (5) (9) of the central shaft (8b) and the support arm (13a) in a valve body (4) Seal valve structure for raw material loading inlet of melting furnace. 3. A tube for supply and discharge of cooling water to the upper shaft (8a)
2. An opening (20) through which (10) passes.
A seal valve structure for a raw material charging inlet of the melting furnace as described above.