JPH089597Y2 - Seal gate device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a seal gate device having an openable and closable opening for inserting and removing a sublance into and from a molten metal furnace. The sublance is a rod-shaped object for measuring and sampling the temperature of molten metal at its tip.

[Prior Art] When harmful gas is generated from a reaction furnace or the like, its internal space is
It is sealed by the structure of the furnace itself or by covering with a lid. When preventing outside air (air) from entering the inside, the furnace body is similarly sealed.

If it is necessary to perform operations such as the introduction of raw materials into the furnace and the measurement of the inside of the furnace (sampling by sublance etc.) from the outside of the furnace body, an opening for that is provided in the furnace body or lid. In addition, it is usual to install an opening / closing gate device in the opening. Whenever the furnace body is separated and opened or the lid body is removed in each of the above work,
This is because the emission of gas or the invasion of outside air during that period is remarkable. Since it is necessary to close the inside of the furnace as much as possible while the opening is closed, the above gate device is required to have high sealing performance.

Generally, a ball valve or a gate valve type is used as such a gate device, but when the inside temperature becomes high (there are many such reactors), for example, Nippon Ball Valve Co., Ltd. Catalog (CAT No83
The high temperature valve shown in 104) is used.

The above-mentioned high temperature valve is a ball valve in which a metal valve body and a body are directly in sliding contact (metal touch) without using an O-ring having low heat resistance, and a gland packing is used in other clearances. . Further, in order to allow thermal expansion of the valve body and the body, a body sleeve that is in sliding contact with the valve body is formed as a movable sleeve, and a spring is pressed from the casing toward the valve body.

A butterfly valve or a damper of the same type is generally used as a gate device when the gas temperature exceeds 500 ° C. This is the valve body and casing (or body)
This is because there is no sliding contact with and there is no need to consider thermal expansion, and since the valve body is flat, it is easy to cool.

[Problems to be Solved by the Invention] The above-mentioned high temperature valve has the following problems. That is, it is necessary to use a special alloy as a constituent material of the valve body and the body portion that are in sliding contact with each other, which is very expensive.

When dust or the like is contained in the gas, these are caught in the above-mentioned sliding contact portion, leading to malfunction or deterioration of sealing performance.

Since it is difficult to cool the valve disc, the maximum operating temperature is
Limited to around 500 ° C.

Face-to-face distance (distance between upstream and downstream openings)
In addition to the diameter of the valve element (ball-shaped), the length of the body (movable sleeve) and spring is required, and the method of occupying the axis (axis orthogonal to the opening surface; opening axis) direction is large. .

On the other hand, the butterfly valve or the damper of the same type has the following problems.

Since there is a gap between the valve body and the body, or at the root of the rotary shaft of the valve body, a sufficient sealability cannot be expected.

Since the rotary support shaft of the valve element crosses the center of the opening, workability is poor when the raw material is introduced through the opening and the condition inside the furnace is measured.

Since the valve body rotates, the face-to-face distance (or the length corresponding to this in the direction of the opening axis) also needs to be equal to or larger than the diameter of the valve body.

[Object of the Invention] The present invention has been made to solve the above-mentioned problems, and when closing, the opening can be closed with a high sealing property, while at the time of opening, the opening can be completely opened and high temperature (for example, 500 ° C). Above) and applicable to a use environment with dust, the length occupied in the opening axis direction is short, and it is inexpensive-providing a seal gate device suitable for inserting and extracting a sublance into a molten metal furnace. Is.

[Means for Solving the Problems] In order to achieve the above-mentioned object, a seal gate device of the present invention has an openable and closable opening through which a sublance (or another rod-shaped object having an equivalent function) is inserted into and removed from a molten metal furnace. The seal gate device includes a closed casing having coaxially an upper opening and a lower opening (of which the upper opening can be opened and closed) as the opening, and the casing of the upper opening. A plate-shaped valve body, which has a seating surface for packing abutment around the inner side and has a packing that abuts the seating surface on the upper surface and an insulating refractory on the lower surface, is directed toward the opening (that is, the upper opening and the lower portion). It is connected to the rod tip of a linear actuator installed so as to be able to move forward and backward from one side thereof (in the direction approaching the axis connecting the opening), and the connection is made by connecting the rod tip with a connecting member. One end is swingably connected in the vertical axis direction of the opening, and the valve element is connected to the connecting member via a spherical rod end. ) When the valve body is moved forward and backward toward the upper opening by the linear actuator so that it can be freely supported from below, the valve element swings in the vertical axis direction of the opening near the opening while A guide member for guiding a valve body having an inclined track is provided so as to come into contact with and separate from the seat surface, and a gas blowing pipe for cooling and purging the inside of the casing is provided.

[Operation] Since the seal gate device of the present invention has the closed casing, the inside of the molten metal furnace can be sealed, while the casing has an opening that can be opened and closed, and the furnace can be opened from the outside through the opening. Sublances can be inserted and removed. That is, the molten metal in the furnace can be appropriately sampled by opening the opening only when necessary and passing the sublance downward from above. Besides, there are the following characteristic actions.

The plate-shaped valve body comes into contact with the seat surface around the upper opening through the packing. Therefore, not only is the sealing property high when closed, but the sealing property is not impaired even if dust or the like is present between the valve body and the seat surface.

The valve element moves reciprocally between the opening (the axis connecting the axes, that is, the opening axis) and the side thereof, together with the rod tip portion driven by the linear actuator. Even during this movement, the plate-shaped valve body is kept substantially parallel to the opening and does not rotate like a butterfly valve, so the length occupied in the opening axis direction of the device is short. Further, when the valve body moves (retracts) to the side of the opening, the opening is completely opened.

When the valve body moves as described above, it is guided by the guide member and abuts and separates from the seating surface of the upper opening while swinging in the vertical axis direction of the opening near the opening. That is, when the valve body comes into contact with the seat surface, a component in the opening axis direction is given to the force for driving the valve body by the linear actuator via the guide member, and the valve body is pressed onto the seat surface. The sealing property shown in is further improved. Further, at this time, since the packing comes into contact with and separates from the seat surface almost without sliding, damage to the packing or the seat surface is prevented. In addition, since the valve element is supported from below by a spherical rod end, it can be freely swung in all directions of 360 °, and therefore a uniform pressure is applied to the seat surface over the entire circumference. The packing is brought into contact with to secure the sealing property. Moreover, this action is brought about without change even if the seat surface is inclined due to manufacturing error or deformation.

The valve body is in a high temperature atmosphere directly connected to the molten metal furnace,
Moreover, even though it is exposed to radiant heat from the molten metal, the maximum operating temperature is extremely high because the valve body is plate-shaped and there is no sliding contact area that is affected by thermal expansion, and because it has a heat resistant refractory on the bottom surface.

Since it does not seal by metal-to-metal contact (metal touch), inexpensive materials can be used for each member including the valve body.

Since the present device includes the closed casing that is connected to the upper opening and the lower opening, it can be installed in the middle of the pipe (the pipe for inserting the sublance). If another sealing means is provided in the upper or lower line and either the sealing means or the present sealing gate device is always closed, no harmful gas will be present during the above work through the opening. The outflow of air and the invasion of outside air can be prevented. At this time, the harmful gas or the outside air filling the casing is scavenged by blowing the purge gas.

The valve body, the rod tip of the linear actuator, the gate member, and the like arranged inside the casing are cooled by the cooling gas blown therein. Further, since the packing of the valve body is provided on the side facing the upper opening and does not come into direct contact with the atmosphere in the lower part, that is, inside the furnace, it is less likely to be affected by heat. From these points, the maximum operating temperature of the seal gate device is very high.

[Embodiment] An embodiment of the present invention will be described with reference to FIGS. This embodiment relates to a seal gate device for opening and closing a sub lance insertion port in a converter as shown in FIG.

As is well known, the converter 3 is a smelting furnace for steelmaking, but it reacts with the molten steel (or molten pig iron) 3a or oxygen blown from the blowing lance 5, and contains carbon monoxide (CO) at a high temperature (around 1400 ° C). Generates a large amount of gas. In this embodiment, the converter 3
The furnace opening is sealed with a hood 4, and the gas generated in the furnace is guided to a duct 4p so as not to leak to the atmosphere and then sent to a gas treatment facility (not shown). The gas pressure inside the converter 3 and the hood 4 is kept at a slightly high pressure (about 0.5 kg / cm ² G) for the purpose of promoting the metallurgical reaction. Note that the above-mentioned furnace gas contains CO and is harmful, and there is a risk of explosion if air is mixed into the gas.

In the converter 3, the sublance 6 is used for temperature measurement and sampling of the molten steel 3a. The sub-lance 6 is inserted downward from the opening (insertion port) 4a on the hood 4, and its tip is soaked in the molten steel 3a to serve the above purpose. In this embodiment, the insertion pipe 4c is provided above the opening 4a so that the above gas does not flow out (or outside air enters) from the opening 4a.
, And a packing seal 7 was provided at the upper end of the same to make sliding contact with the outer peripheral surface of the sub lance 6, and the following seal gate device 20 was continuously provided at the lower end of the insertion tube 4c.

As shown in FIG. 3, the seal gate device 20 includes a hood 4
Is provided with a casing 26 in which the opening 4a and the lower end opening 4b of the insertion tube 4c are connected to them as a lower opening and an upper opening, respectively. Inside the casing 26, a valve body 22, a connecting member 23, a guide rail 25, a hydraulic cylinder, etc. Linear actuator 24
The rod tip portion (operating portion) 24a is arranged to seal the opening 4b from the inside of the casing 26. Here, the openings 4a and 4b serve as upstream and downstream passage ports when the in-furnace gas flows out, respectively. The casing 26 has a closed structure except for the above-mentioned openings 4a, 4b and gas blow-in pipes 26a, 26b, 26c which will be described later, and the driving portion of the linear actuator 24 is attached to the outside of the side end portion of the upper wall. A lid 26d that is removable at the time of internal inspection is fixed to a part of the.

The plate-shaped valve body 22 has a packing 22a fixed to the upper surface thereof, which abuts the seating surface 21 formed around the opening 4b. Adiabatic refractory 22c is attached around it. The refractory material 22c is for protecting the valve body 22 against heat received from the inside of the hood 4 through the opening 4a.

The valve element 22 and the rod tip portion 24a of the linear actuator 24 are connected via a connecting member 23. That is, the protruding end of the rod end 22b is inserted into the pin 23a at the tip of the connecting member 23 to support the valve body 22 in a differential manner, while the rear end of the connecting member 23 is provided via the pin 23b. The linear actuator 24 is connected to the tip of the rod tip portion 24a so that the connecting member 23 and the valve body 22 can swing up and down with the pin 23b as a fulcrum. Further, to the connecting member 23, rotating rollers 23c were attached to both sides of the pin 23b, and another set of similar rotating rollers 23d was attached to both sides slightly closer to the tip. As with the valve element 22, a heat insulating refractory material 23e is attached to the lower surface of the tip of the connecting member 23.

Two guide rails 25 are arranged in parallel (see FIG. 4) in the lower part of the casing 26 via a fixing bracket 25a. The guide rail 25 has its upper surface in contact with the lower surfaces of the rotating rollers 23c, 23d and guides them, and has a long horizontal track and an upward arc shape formed in a portion near the tip (close to the opening 4b). And an inclined track.

26a and 26b in the figure are nitrogen gas blowing pipes for cooling the inside of the casing 26. This is because the casing 26 is filled with the high temperature gas in the hood 4, and the valve body 22, the connecting member 23, the guide rail 25 and the linear actuator 24.
The rod tip portion 24a of this is designed not to overheat, and the nitrogen gas blown from these at room temperature is not affected by the opening 4a.
Sent into the hood 4 from the furnace and ducted with the gas in the furnace
Emitted from 4p.

With the above configuration, the valve body 22 operates as follows to open and close the opening 4b. First, the solid line in FIG. 3 indicates that the rod tip portion 24a of the linear actuator 24 is extended and the packing 22a is seated.
The state where the valve body 22 is brought into contact with the valve body 21 to seal the opening 4b is shown.
Since the valve body 22 is differentially supported via the rod end 22b, the packing 22a is in uniform contact with the seat surface 21. As described above, the guide rail 25 has an inclined track in the portion near the opening 4b.
Since the roller 23d of the connecting member 23 moving on 25 rides on the inclined orbit, the force of the linear actuator 24 trying to extend the rod tip portion 24a is converted into a force to the upper right of the figure, and the valve body 22 Is pressed against the seat surface 21. In the case of this embodiment, the high gas pressure in the converter 3 acts on the lower surface of the valve body 22 and the valve body 22 is actuated together with the above force.
22 will be pressed against the seat surface 21.

When the rod tip portion 24a of the linear actuator 24 is contracted, the valve element 22 is retracted leftward together with the connecting member 23 which is guided on the guide rail 25 and moves leftward, and the opening 4b is opened. At this time, the roller 23d is first guided by the guide rail 25
As it descends from the inclined track to the horizontal track, the connecting member 23 and the valve body 22 first move slightly downward with the pin 23b as a fulcrum and separate from the seat surface 21, and then horizontally left. Move towards. The valve element indicated by the chain line (imaginary line) in the figure shows the state of being retracted in this way.

When the rod tip portion 24a of the linear actuator 24 is extended, contrary to the above, the valve body 22 horizontally moves to the right and then swings upward to bring the packing 22a into contact with the seat surface 21.

By the way, the following packing seal 7 is provided on the upper portion of the insertion tube 4c which is continuously provided on the openings 4a and 4b for passing the sub lance 6. That is, as shown in FIG. 4, a stuffing box 7a was formed at the upper end of the insertion tube 4c, a gland packing 7b was packed inside the stuffing box 7a, and the packing box 7c was pressed. Since the inner diameter of the gland packing 7b is set to be in sliding contact with the outer peripheral surface of the sub lance 6,
Gas does not flow out or enter through the packing seal 7 while the sublance 6 is inserted into the insertion tube 4c.

Then, a purging nitrogen gas blowing pipe 4d and a purging nitrogen gas blowing pipe 4e were connected to the upper and lower portions of the insertion pipe 4c, respectively. The blow-out pipe 4e is connected to a purging blow-in pipe 26c provided in the casing 26 of the seal gate device 20 via a check valve 4f.

Therefore, the insertion of the sublance 6 into the converter 3 for temperature measurement / sampling of the molten steel 3a is performed by the following procedure.

First, in a state in which the opening 4b is closed by the valve body 22 of the seal gate device 20, the sub-lance 6 is passed through the packing seal 7 in advance and the tip thereof is lowered to a position near the upper surface of the valve body 22 in the insertion tube 4c and stopped. Keep it. It should be noted that it is preferable to start blowing nitrogen gas from the blowing pipe 4d into the insertion pipe 4c before this to replace the internal air with nitrogen.

Nitrogen gas is blown into the insertion pipe 4c from the blowing pipe 4d until the pressure in the insertion pipe 4c becomes equal to (or more than) the gas pressure in the furnace in the hood 4. At this time, when the pressure in the insertion tube 4c exceeds the pressure in the hood 4, this nitrogen gas flows into the blow-out pipe 26c via the check valve 4f and blow-in pipes 26a, 26b.
While cooling the inside of the casing 26 with the nitrogen gas from the inside, the gas in the furnace in the vicinity thereof is purged.

The valve body 22 is retracted as described above to open the opening 4b, and the sublance 6 is lowered to the molten steel 3a through the opening 4b to measure temperature and sample.

After raising the temperature of the sublance 6 after the temperature measurement and sampling until the tip portion enters the insertion tube 4c, the opening 4b is closed by the valve body 22.

Continue blowing nitrogen gas from the blow-in pipe 4d, and blow out the furnace gas that has flowed into the insertion pipe 4c between
Purging (scavenging) from c into the hood 4.

After the purging is completed, the gas is stopped, the sublance 6 is extracted upward from the packing seal 7, and the sampled sample is collected.

According to the above, since the gas passage port is always closed by either the seal gate device 20 or the packing seal 7, the outflow of the gas in the furnace and the invasion of the outside air are completely prevented. The gas used for purging is not limited to nitrogen,
Any harmless inert gas may be used. The same applies to the cooling gas in the casing 26.

In addition to the above embodiments, the seal gate device according to the present invention can be implemented as follows.
That is, the linear actuator is not limited to the hydraulic cylinder or the electric cylinder described above, but the following may be used, for example. That is, a mechanism in which a nut member screwed into a screw shaft (or a ball screw shaft) reciprocates as an operating part by rotation of the shaft, or a mechanism in which the operating part reciprocates with a rack meshing with a drive gear (pinion). And so on.

By the way, FIG. 1 shows a reference example, and shows a molten metal furnace, a cover thereof, and a seal gate device which diverts a part of the technical idea of the present invention. Molten metal furnace 1
Is for storing the high temperature molten metal 1a inside the refractory 1b. In order to prevent oxidation of the molten metal 1a due to contact with air, the bath surface is covered with a cover 2 and argon gas is blown into the inside from a blow pipe 2b to fill it. In this molten metal furnace 1, lime (not shown) for adjusting the basicity of the metal 1a is charged from above the bath surface, or a thermocouple (not shown) is inserted to measure the temperature of the metal 1a. Therefore, an opening 2a is provided in a part of the cover 2, and a seal gate device 10 for opening and closing is provided along with the opening 2a.

The seal gate device 10 is configured as follows. First, a smooth seat surface 11 is formed around the opening 2a. Then, a plate-shaped valve body 12 having a packing 12a that abuts against the seating surface 11 and capable of sealing the opening 2a is attached to the electric cylinder 14
It is attached to the tip of the rod tip portion (expandable portion) 14a. In the electric cylinder 14, the support pin 14b at the base is inserted into the bracket 14c on the cover 2 so as to be swingable.
4a is installed on the side of the opening 2a toward the opening 2a. The valve body
12 has a mounting handle 12b provided on one side thereof and is mounted on the rod tip portion 14a, and guide pins 12c are provided on both sides of the mounting handle 12b in a protruding manner. Guide plates 15 are installed on both sides of the mounting handle 12b and the rod tip portion 14a, and the guide pins 12c are inserted into the guide grooves 15a. Guide groove 15
The letter a has a horizontal orbit, and has a downwardly inclined orbit in a circular arc shape in the portion near the opening 2a.

In the seal gate device 10 thus configured, when the operating portion 14a of the cylinder 14 is extended as shown in the figure, the packing 12a abuts the seat surface 11 and the valve body 12 seals the opening 2a. Therefore, the space above the molten metal 1a covered with the cover 2 is filled with the argon gas and the invasion of the outside air is prevented, so that the oxidation of the metal 1a during storage is prevented.

Opening 2a for performing the work such as lime charging and temperature measurement
The rod tip 14a of the electric cylinder 14
By retracting the valve body 12 to the side of the opening 2a (to the right in the figure). At this time, since the valve body 12 is guided by the guide plate 15 (guide groove 15a) via the pin 12c, first, the pin 12c moves along the above-described inclined trajectory in the guide groove 15a to move from the seat surface 11 to the seat surface 11. They are separated from each other while swinging to the upper right in the figure, and then move to the right in the guide groove 15a substantially horizontally along the horizontal orbit. However, due to rocking
The vertical movement amount of 12 is almost equal to the height of the inclined track of the guide groove 15a and is small. Argon gas continues to be blown into the cover 2 through the blow pipe 2b while opening the opening 2a.
It is necessary to close the opening 2a as soon as the work is completed, because the inflow of outside air is inevitable to some extent.

In order to close the opening 2a, the rod tip portion 14a of the electric cylinder 14 is extended to move the valve body 12 in the opposite direction to the above.In this case also, the valve body 12 is guided by the guide plate 15 to the opening 2a. At a near position, the packing 12a swings downward and the packing 12a abuts on the seat surface 11. At this position, since the pin 12c is in the inclined track of the guide groove 15a, the electric cylinder 14 is connected to the rod tip portion.
The force to extend 14a is converted into a force to the lower left and works to press the valve body 12 against the seat surface 11. Some lime powder may adhere to the seat surface 11 when lime is added,
The sealability is ensured by the action of the packing 12a and the action of the pressing force on the seat surface 11 of the valve body 12, and the argon gas does not leak or the outside air does not enter.

If the valve body 12 may be overheated or deformed by the radiant heat of the molten metal 1a, a water passage may be formed in the valve body 12 to connect a circulation hose, and this may be water-cooled. However, in this case, the cover 2 also needs to be water-cooled or heat-resistant.

[Effect of the Invention] According to the seal gate device of the present invention, the following effects are brought about.

When the opening is sealed, the valve body is pressed against the seating surface around the opening via the packing, so that the sealing property is extremely high. Further, when opening and closing, the packing comes into contact with and separates from the seat surface almost without sliding, so the life of the packing is long and the seat surface is less worn.

When opening the opening, the valve element retracts to the side of the opening and the opening is completely opened.Therefore, work through this opening, i.e. You can do it.

The valve has a heat-resistant refractory and is suitable for use in a high temperature atmosphere.Because the valve has a packing and can be pressed against the seat surface with a uniform force all around, dust particles It has the advantage that the opening can be sealed regardless of the presence or absence of the seat surface and the angle of inclination of the seat surface, and that the packing hardly slides on the seat surface, so it is not easily damaged. Therefore, it can be widely used in various furnaces. You can

Its short length in the direction of the opening axis is advantageous when there is no space above the opening.

Since it is not necessary to use a special material for each member such as the valve body, and there is no portion that requires precise processing, the manufacturing cost is low.

If combined with another sealing means, it is possible to prevent outflow of harmful gas and invasion of outside air even while performing work through the opening.

Since it can be installed in the middle of the gas pipeline, the range of applications is further expanded. In addition, the members in the casing are collectively cooled by the blown gas, and the packing on the valve body is not easily affected by heat, so the maximum operating temperature of the device is very high.

[Brief description of drawings]

FIG. 1 is a side view showing a molten metal furnace as a reference embodiment related to the present invention, a cover thereof, and a seal gate device in a partial sectional view. 2 to 4 show an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a converter and a hood, and FIG. 3 shows a seal gate device of the embodiment. FIG. 4 is a sectional view taken along line IV-IV in FIG. 1 ... Molten metal furnace, 2 ... Cover, 3 ... Converter, 4 ...
Hood, 6 ... Sublance, 2a, 4a, 4b ... Opening, 10,20
…… Seal gate device, 11,21 …… Seat surface, 12,22 …… Valve disc, 12a, 22a …… Packing, 23 …… Coupling member, 14 (electric cylinder), 24 (hydraulic cylinder) …… Straight line Actuator, 14a, 24a …… Rod tip (operating part), 15 (guide plate), 25 (guide rail) …… Guide member, 26
……casing.

Claims (1)

[Scope of utility model registration request] 1. A seal gate device having an openable / closable opening through which a sublance is inserted into and removed from a molten metal furnace, wherein the seal gate device comprises a hermetic casing having an upper opening and a lower opening coaxially with each other. A seat surface for packing contact is provided around the inside of the casing of the upper opening, and a plate-shaped valve body having a packing contacting the seat surface on the upper surface and an adiabatic refractory on the lower surface is directed toward the opening. One end of the connecting member is connected to the rod tip of a linear actuator installed so as to be able to move forward and backward from one side thereof, and one end of the connecting member is swingably connected to the rod tip in the vertical axis direction of the opening. , The valve element is connected to the connecting member via a spherical rod end so that the valve element can be differentially supported from below, and the valve element is directed toward the upper opening by the linear actuator. When advancing and retracting, a guide member for guiding the valve body having a slanted orbit is formed so that the valve body swings in the vertical axis direction of the opening in the vicinity of the opening and comes into contact with and separates from the seat surface of the upper opening. A seal gate device, characterized in that a gas blowing pipe for cooling and purging the inside of the casing is provided.