JPH0260432B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a sliding gate valve for controlling the flow rate of molten metal.

``Prior Art'' There are two types of sliding gate valves attached to molten metal containers such as tundishes, one of which is a sequential movement type and the other is a reciprocating type. For example, the sequential movement type is shown in Japanese Patent Publication No. 18137/1983.
A plurality of sliding gates are sequentially moved along a guide path relative to the pouring opening of a molten metal container such as a tundish, and when the sliding gate with an orifice overlaps the pouring opening, the molten metal is poured out and the hole is filled. The sliding gate is constructed to stop the flow of molten metal when it overlaps with the pouring opening, and the reciprocating type has a single sliding gate with an orifice, as shown in Japanese Patent Publication No. 58-41142, for example. The sliding gate is mounted on a support frame and reciprocated, allowing the molten metal to flow when the orifice aligns with the spouting opening and stopping the flow when the orifice is removed from the spouting opening.

However, when supplying molten metal from a tundish to a mold of a continuous casting apparatus, problems arise if only a conventional sliding gate valve is attached to the tundish. The tundish is fed with molten metal from a ladle, and the effective operation of continuous casting equipment requires a virtually constant flow of molten metal from the tundish to the mold, which requires a sliding gate valve. Therefore, it is necessary from time to time to adjust the flow of molten metal flowing out of the tundish. This is also the ferrostatic head of the molten metal in the tundish.
It is necessary to keep it almost constant. This is done by opening and closing the spout opening in the ladle when the amount of molten metal released into the mold exceeds the amount that produces a hydrostatic head that can be effectively controlled simply by restricting the flow of molten metal. This is done by periodically pouring molten metal into a tundish.

Continuous casting equipment is operated continuously for a very long time, and the sliding gate is worn out or damaged during this time.
Two sliding gates cannot be used consecutively in tandem. Therefore, it is advantageous to equip a tundish used in a continuous casting apparatus with a sliding gate valve of the sequential movement type, which allows the sliding gate to be quickly replaced. In a reciprocating sliding gate valve, when the sliding gate becomes worn, the container (tundish) must be removed from the casting apparatus, the valve mechanism must be opened, and the worn sliding gate must be replaced. Since this takes a long time and the operation of the continuous casting apparatus must be stopped during this period, a reciprocating type sliding gate valve is obviously unsuitable for application to a tundish for a continuous casting apparatus. However, if the conventional sliding gate valve of the sequential movement type is applied as is to a tundish for a continuous casting apparatus, considerable problems will occur. In sequential sliding gate valves, flow control is achieved by replacing the sliding gate provided below the spout opening with one having a different orifice diameter. Although the diameter of the orifice varies stepwise, it is not possible to control the flow rate to vary infinitely using this method. Furthermore, changing the sliding gate to change the flow rate is uneconomical. Because,
For example, each time it is desired to vary the flow rate to compensate for changes in the hydrostatic head in the tundy, a new sliding gate with a different diameter orifice must be installed in place of the active sliding gate. . Such a sliding gate must be replaced even when the sliding gate is still in operation and has not yet worn out. Therefore, the need to change the sliding gates to effect flow regulation greatly increases the number of sliding gates that must be used during a given valve operation. Therefore, the successive movement type sliding gate valve has the advantage of being able to quickly replace the sliding gate when it wears out, and it also has the ability to infinitely adjust the flow rate from fully open to fully closed by throttling the sliding gate valve. A sliding gate valve that eliminates the drawback of the conventional method of having to prepare a large number of sliding gates is
Proposed in No. 59071. This sliding gate valve, which basically belongs to the sliding gate valve of the sequential displacement type, has two independently actuable drives, one of which is a series of sliding gate valves supported on a support frame. one drive gate is connected to the support frame and is adapted to move the support frame independently of the first drive device to provide a flow restricting action. This configuration allows the valve to be closed immediately when a danger occurs, and also has the ability to immediately return to the adjusted flow rate when the danger has passed and it is desired to restore the flow of molten metal. ing.

"Problems to be Solved by the Invention" Although the sliding gate valve described in the above-mentioned Japanese Patent Publication No. 1-59071 is greatly improved compared to the conventional sliding gate valve, there are some problems when using it in the field. left behind. The equipment is bulky, lacks a concrete means for feeding and holding a new sliding gate into a support frame before being moved into the operating position, and the ability to quickly replace worn pour tube assemblies. For example, it lacks.

The object of the present invention is to further improve the sliding gate valve disclosed in Japanese Patent Publication No. 1-59071 so that it is suitable for on-site use, and to obtain a more compact device.

"Means for Solving the Problem" According to the present invention, in order to achieve the above object,
a valve for controlling the flow rate of molten metal from a spout of a pouring tank, the valve being disposed below the sliding gate support rails and opposing longitudinally extending sliding gate support rails connected to the pouring tank; a frame having therein opposed support tube support rails extending approximately the same length; a top plate fixedly attached to the frame having a through opening in fluid communication with the spout of the reservoir; and the sliding gate support. a gate mounting portion slidably supported on a rail and extending below the top plate;
a first having a gate actuation section and a gate evacuation section;
a sliding gate that sequentially moves inside the frame along a movement path; a tube mounting portion, a tube actuating portion, and a tube discharge that are slidably supported on the tube support rail and extend below the first movement path; a spout tube assembly that moves sequentially within the frame along a second movement path having portions; and a first guide provided in the frame for feeding the sliding gate to the gate mounting portion;
a second guide provided in the frame for feeding the spout tube assembly to the tube mounting portion and a sliding gate sequentially along the sliding gate support rail and/or the spout tube assembly sequentially along the sliding gate support rail; A flow control valve is provided, characterized in that it comprises a supply drive for moving along the tube support rail and a throttle drive for moving the sliding gate support rail in a horizontal direction perpendicular to its longitudinal direction.

"Operation" Since the present invention is constructed as described above, the sliding gate is fed from the lateral direction through the first guide to the gate mounting portion of the first movement path, is supported by the sliding gate support rail, and then The supply drive unit sequentially transports the gate on the support rail along the first movement path to the gate operating section and the gate discharging section for gate replacement. The support rail can be moved in the right angle direction by the aperture driver, so if there is a sliding gate with a hole in the gate operating part, this sliding gate will be shifted from the opening in the top plate to prevent the flow of molten metal. can be reduced to an appropriate amount. Similarly, in accordance with the invention, the dispensing tube assembly is fed from the second guide into the second movement path and is fed by the feed drive along the second movement path over the tube support rail from the tube mounting portion to the tube actuation portion. Then, the spout tube assembly that was in the tube working section is pushed by a new spout tube assembly and delivered to the tube discharge section, allowing for quick exchange of the spout tube assembly.

"Example" Figures 1 and 2 show a spout 12 in a lining 14 of a spout tank 16 such as a tundish for pouring molten metal into a mold of a continuous casting device (not shown).
A sliding gate valve structure 10 is shown operatively installed in FIG. For pouring, use a perforated refractory sliding gate as shown at 17 in FIGS. 2, 6, and 7, or a non-perforated refractory sliding gate as shown at 17' in FIG. 1 using the refractory top plate 18. It is controlled by manipulating the Sliding gate valve structure 10
It also has a replaceable spout tube assembly 19 forming a valve extension for directing the flow of poured molten metal to the mold of the casting apparatus. Sliding gate valve structure 1
0 is adapted to be attached to the tank 16 by a threaded connection 20 extending through a hole 21 in the frame 22. That is, a threaded connection 20 attaches the frame 22 to a mounting plate 23, which in turn is attached to the tank by bolts (not shown) that connect to nut plates 24 below the lining 14 of the tank. A heat insulating pad 26 made of asbestos or the like is preferably inserted between the mounting plate 23 and the tank 16.

As shown in FIG. 4, the mounting plate 23 is connected to the tank outlet 1.
2 is a generally flat metal plate with a central opening 28 for receiving the lower end 30 of the refractory material forming the refractory material. The upper surface of the mounting plate 23 has a recess 31 along its side edge, which recess has a nut 34 cooperating with the screw connection 20.
It communicates with a bolt hole 32 for receiving the.

Mounting plate 23 is provided with a plurality of internal fluid passages for conducting cooling air and inert gas during valve operation. A first passageway 36 concentric with the central opening 28 is defined by a recess formed in the wall of the opening and covered by a ring 38 which is welded to the mounting plate to seal the passageway. Additionally, the mounting plate is formed with a pair of opposed non-extending elongated passageways 40, 42 which extend around three sides of the mounting plate and terminate in a downwardly directed outlet 44, which is connected to a valve spring as will be described in more detail below. supply cooling air to. An air inlet 46 is provided on one side of the mounting plate for delivering cooling air to the fluid passageways 36, 40, 42, which passageways are indicated by arrows 4.
are coupled in series as shown at 8, whereby the cooling air is first directed around the annular passage 36 and then in both directions through passages 40, 42 before being discharged through the outlet 44.

Further, an elongated passage 50 is provided in the mounting plate 23,
This passage communicates at one end with an opening 52 in one side of the mounting plate for coupling to a source of inert gas, and at the other end a downwardly directed passage adapted to communicate with a gas supply in the top plate 18 of the valve to be described below. It communicates with the discharge opening 54 .

Valve frame 22, which is formed from a machined metal casting reinforced with member 56, is particularly illustrated in FIGS.
As shown in the figure. This frame 22 houses the operating parts of the valve structure and is adapted to be attached to and removed from the mounting plate 23 as an assembled unit by means of screw connections 20. Frame 22 has three major sections, shown in FIG. 3 as plate mounting section 58, actuation section 60, and plate ejection section 62. Near the plate mounting portion 58 the frame 22 has a feed drive 68
A coupling body (Fig. 8) that can engage a bracket device 66 for mounting with a threaded hole 64 (Fig. 8).
It is attached with a coupling body (not shown) that can be engaged with. The feed drive 68 has a fluid actuated cylinder 70 with a reciprocatable piston mounting a piston rod 72 and a pusher 74. A second set of drivers, referred to as "diaphragm drivers", are mounted to frame 22 near its actuating portion 60. These drives 76 operate oppositely and independently of the feed drive 68. Each of these has an actuating cylinder 78 mounted to the frame by a bracket 80 with a hole 8
2 (FIG. 9) and is attached to the frame side wall with an engageable coupling. Each of the cylinders 78 houses a reciprocatable piston, the piston rod 83 having a laterally elongated coupling catch 86 which couples a sliding pin 88, which slide pin 88 fits into an opening 90 in the frame side wall (FIG. 9). Aperture rails 84, 84' are mounted which are received and guided within and are operative to operate a sliding gate located within the working portion 60 of the frame. Rail 84' is shorter than rail 84 to allow the gate to pass through mounting portion 58 of the frame.

The interior of the frame 22 is shaped to define a passageway through which the sliding gate 17 or 17' and the spout tube assembly 19 can move between the mounting section 58, actuation section 60, and discharge section 62, respectively, of the frame. . The mounting portion 58 of the frame 22 herein described has a laterally extending guideway 9 adapted to pass through the sliding gates 17, 17' and the spout tube assembly 19, respectively.
2 and 94 (Figure 9). Guide route 9
2 is a sliding gate 96 extending oppositely to the guide path 94.
The rail 96 serves to support a sliding gate mounted within the valve. The bottom of the guideway 94 is defined by a similar set of sliding rails 98 that support the dispensing tube 19 to which it is attached. A contact rail 99 along the roof of the frame of this part serves to position the sliding gate 17 vertically when it moves from the mounting part 58 of the valve to its working part 60.

As shown in FIGS. 8 and 9, the frame 22 allows insertion of a sliding gate or spout tube from either the right or left side by installing identical guideways 92', 94' on opposite sides of the frame. It is made possible. When the guideways 92, 94 are selected for use, they are closed by plugging members 100 (FIG. 3), shown as 92', 94' on the opposite side of the frame, which close the holes 104 (FIG. 8). ) a stop plate 10 spaced vertically from a back plate 102 screwed to the frame 22 and filling the guideways 92', 94';
6,108 to effectively prevent the spout tube from moving beyond the desired location near the pusher 74. Obviously, mounting from the opposite side of the frame simply involves inserting the filler member 100 through the guideways 92', 94'.
This is easily accomplished by moving the guideways 92, 94 on the opposite side to fill them.

The active part 60 of the frame 22 is the stationary fireproof top plate 1
8 and a central opening 112 in the refractory top plate aligns with the spout 12 from the vessel to define an inlet to the gate valve structure 10. At a vertically spaced apart position below the opening 110, the frame 22 faces the base 11 spaced apart from each other.
4, whose bases together with the upper wall of the frame define a cavity 115. base 114
is provided with laterally spaced threaded holes 116 which serve as a series of holes operative to hold spout tube assembly 19, sliding gate 17 or 17', and top plate 18 in face-to-face sealing relationship. The coupling body 118 that mounts the spring-pressing lever 120 is received. The lever 120 swings on a rocker 122 held by a coupling body 118 and is mounted on a hole 126 in the frame.
Headed push pin 124 movably mounted inside
is pressed by a spring. Hole 126 is counterbored at its upper end to provide a seat for a push pin head 128 and a spring 130, which is inserted between the push pin head and the opposing surface of mounting plate 23.

Hole 126 in frame 22, as shown in FIG.
communicates with the outlet 44 of the mounting plate 23, whereby cooling air is supplied to prevent the spring 130 from overheating. Exhaust ports 44 preferably include exhaust holes 132 to effectively distribute cooling air to the respective spring assemblies.

A pair of vertically spaced alignment holes are provided in the side walls of the valve frame 22 near the actuating portion 60, indicated at 196 and 198, respectively. Each pair of alignment holes is adapted to receive a selectively positionable stop pin 200 that traverses the respective path of movement of the sliding gate or spout tube assembly and that, during the gate replacement process, stops the sliding gate. 17 or pouring tube assembly 1
It operates to prevent movement of either when it is desired to replace 9 with another sliding gate or spout tube assembly. Similar holes 196' are provided in rails 84,8.
4' (FIG. 1) to allow a stop pin 200 to pass through these members. sliding gate 17
When it is desired to replace both the spout tube assembly 19 and the spout tube assembly 19 at the same time, the stop pin 200 is completely withdrawn from the frame, leaving both paths of motion free and unobstructed. Under normal operating conditions, the stop pins 200 are retained in the lower pair of holes 198 to provide a free path of motion for the sliding gate so that the flow of melt can be quickly stopped as described below.

The evacuation portion 62 of the frame 22 is formed with vertically spaced guideways 134, 136 that open at the ends of the frame (FIG. 9). Guideways 134, 136 are formed in the longitudinal extension of the base 114 to guide the sliding gate 17 or 17' and the spout tube assembly 19, respectively, from a location within the actuating portion 60 of the valve to a discharge point as discussed below. It is defined by stepped shoulders 138, 140 which act as slide-guiding rails.

As can be clearly seen in Figure 3, the aperture rails 84, 8
4' is a sliding gate installation guide path 9 in the frame 22.
placed at approximately the same height as 2. Rail 84 is longer than rail 84' and extends substantially the entire length inside the frame. On the other hand, the rail 84' moves the sliding gate 17 from the guide passage 92 to the pusher 74 when the sliding gate is installed.
It is shorter than the rail 84 so that it can be passed through the position related to the rail 84. The rail 84 further includes a guideway 92
a plurality of longitudinally spaced magnets 142 along the length facing the
(Fig.), here the magnets are six 4-pole permanent magnets. Its function is as described below, when the sliding gate 17 or 17' is in the mounting preparation position.
However, the purpose is to prevent the rail from falling off the rail 84 while the rail is moving to perform the throttling function of the valve.

A sliding gate 1 of a valve structure 10 as shown in FIG.
7, 17', top plate 18 and spout tube assembly 1
9 each consist essentially of refractory material enclosed within a metal frame. The spout tube assembly 19 intended for use in the valve structure described above is of conventional construction consisting of an elongated cylindrical tube 144 having an axial opening 145. tube 14
4 is a length that allows its lower end to extend into a casting machine mold or the like (not shown). tube 1
The upper end of 44 is adapted to be received within a recess 146 in the underside of a generally flat rectangular refractory plate called tube retainer plate 148 . The tube holding plate 148 has a through opening 1 coaxial with the tube opening 145.
49, and is surrounded by a metal casing 150 around the exposed bottom portion and around the circumferential side thereof.

As shown, mortar cement is used to seal the seam between the upper end of tube 144 and retainer plate 148 and to mount the retainer plate within the metal casing. The metal casing is preferably provided with a sagging skirt 152 which serves to protect the mortar joints and strengthen the bottom of the casing. A heat resistant material such as asbestos rope (not shown) can be used to fill the gap 153 between the skirt and tube. tube 144
Secondary attachment between the tube and the retaining plate includes a collar 154 near the top end of the tube that defines a shoulder 156 that is removable to the metal casing 150 with a screw fastener or the like (not shown). This is done by engaging the attached retaining ring 158. The opening 145 of the spout tube 144 and the opening 149 of the retaining plate 148 are formed to have a diameter slightly larger than the opening of the sliding gate to allow metal to be discharged from the passage when the valve is fully closed. is preferable.

The top plate assembly 18 of this valve structure is shown in FIGS.
It is shown in FIG. The top plate assembly 18 has a rectangular refractory 160 mortared within a metal casing 162 of generally L-shaped circumference. The upper surface 164 of the refractory 160 flares above the upper edge of the metal casing and provides a smooth surface contact with the lower surface of the mounting plate 23 and the refractory lining 14 of the vessel when the top plate assembly is within its working portion of the valve structure. A polished finish is provided to provide contact. The refractory 160 is provided with a centrally stepped through opening 166 for receiving a permeable refractory insert 168 in the form of a porous plug with an axial opening defining a melt flow opening 112 through the refractory. The insert 168 has an outer surface 1 stepped to complement the opening 166 in the refractory.
72, and the outermost step is adapted to be segmented with the mating step of the aperture.
The middle step is significantly smaller in diameter than the middle step of the aperture. An annular passageway 174 is thus defined around the insert 168 for supplying inert gas through the insert to the melt opening 112. The refractory is provided with an inclined passageway 176 which opens at 178 at the top of the refractory and is positioned to communicate with the opening 54 in the underside of the mounting plate 23 when the valve is assembled. The inclined passageway 176 thus provides a convenient device for supplying inert gas into the melt flow path 112 while the valve is closed, thereby agitating the metal within the melt flow path and preventing it from solidifying. . By forming the annular ring in this manner, the top plate assembly 18 can be fabricated using conventional refractory forming methods without the need for expensive machining with fragile or multi-part processing tools.

Sliding gate assemblies used in the valve structure may be of the type shown at 17' in FIG. 1 or without holes, as shown in FIG.
It may also have an opening 180 as shown at 17 in FIGS. 6 and 7. The imperforate gate 17' is used to block the flow of molten metal through the valve, as shown in FIG. used. Both gates 17, 17' are made in the same manner so that they have a generally square refractory plate 182 whose feed direction, indicated by F in FIGS. 6 and 7, is slightly longer than the throttling direction, indicated by T. The refractory board 182 is cemented into a metal casing 184 surrounding the perimeter of the refractory board. The metal casing 184 is
To seat and engage on the aperture rails 84, 84',
and a shoulder 186 intermediate its upper and lower edges for sliding engagement on the slide rail 96 at the mounting portion 58 of the valve and onto the shoulder 138 at the discharge portion 62 thereof.
(Fig. 1) is provided. The fireproof plate 182 has a shoulder 188 (FIG. 2) that complements the shoulder of the metal casing.
is formed.

The lower portion of the metal casing, indicated at 190, is formed with a large radius of curvature to provide a guiding cam surface to prevent damage to any member when the respective sliding gate assembly is moved into the working portion of the valve by the pusher 74. The sliding gate assembly can be guided over the upper edge of the spout tube retaining assembly without having to do so.

The lower part of the refractory plate 182 near the lower part 190 of the large curvature of the metal casing is inclined as shown to provide an enlarged storage space 192 for mortar between the refractory plate and the metal casing. The large mortar bed in this area of the sliding gate assembly slides when the sliding gate moves across the tube retaining assembly 19 and when the sliding gate is operated by the movable rails 84, 84' during throttling. Works to buffer the gate.

The sliding gate assembly 17 has an assembly 17', the latter being non-porous, whereas the former has melt flow openings 180.
It is different to have. The position of the opening 180 in the fireproof plate is precisely placed along the longitudinal centerline of the fireproof plate, but is equal to one-half the stroke of the sliding pin 88 from the center point of the fireproof plate to the left in FIG. offset by an amount such that the refractory plate has made a full stroke to the right as viewed in FIG.
The molten metal can flow at full flow rate through the pouring passage in vertical alignment with 12. When gate 17 is fully stroked to the left and rail 84 contacts wall 194, aperture 180 is completely disengaged from aperture 112, thereby stopping the flow of molten metal through the valve. By actuating the throttle drive 76, the position of the opening 180 in the gate 17 can be adjusted to any desired position of these full stroke positions with respect to the top plate opening 112, thereby reducing the flow of molten metal through the valve. The effective dimensions of the channel can be varied to control the flow rate of molten metal therethrough.

A typical commercial embodiment of the sliding gate assembly 17 is approximately 277 mm (10.9 inches) long along the feed direction F, 328 mm (12.9 inches) along the drawing direction T, and 76 mm (3 inches) long. The center of diameter aperture 180 is offset approximately 44 mm (1.75 in.) from the center point of the gate, so that there is approximately 13 mm (1/2 in.) between apertures 112 and 180 when gate 17 is in the blocking position.
Provide fire-resistant materials.

The operation of the valve structure 10 described herein is as follows.

The valve frame 22 is attached to the top plate 1 as shown in FIG.
8. The solid sliding gate 17' and spout tube assembly 19 are preassembled into the working portion 60 of the valve frame and attached to the mounting plate 23 below the spout trough 16. Channel opening 112 through top plate 18 is then vertically aligned with spout 12 through tank lining 14. When molten metal is introduced into the vessel, the flow of molten metal through the valve is blocked due to flow path obstruction by the flow-impermeable sliding gate 17'. During this metal retention period, an inert gas such as argon or nitrogen permeates the porous walls of the insert via passages 50 in mounting plate 23 and passages 176 in the top plate leading to annular passages 174 around insert 168. Pour hole 11 on the top plate
Enter 2. Inserting an inert gas in this way works to stir the molten metal in the blocked flow path,
This prevents it from solidifying therein. Cooling air is also admitted into the mounting plate 23 via an inlet 46 into a valve, from where it flows sequentially through an annular passage 36 around the lower area of the tank lining 14, cooling the refractory material in this area and then through the passage. 40,42
It is discharged from the discharge port 44 (FIG. 4) and cools the spring 130 (FIG. 2).

Once the throttle device has placed the rails 84, 84' in the position shown in FIG. 2 where the rails 84 contact the cavity wall 194, the active sliding gate 17 is manually inserted into the mounting portion 58 of the valve. The sliding gate 17 is inserted into the guideway 92 with the sliding gate shoulder 186 slidingly engaged on the sliding rail 96. The leading edge of the sliding gate 17 collides with the rail 84 and the magnet 14
2 until it is held against the rail 84, thus placing the sliding gate 17 in its ready position close to the pusher 74 of the feed drive 68. The feed drive 68 is then actuated, the pusher 74 moves the sliding gate 17 from its ready position to the actuating portion 60 of the valve frame 22 between the top plate 18 and the spout tube assembly 19, and the imperforate gate 17' It is slid along shoulder 138 into ejection portion 62 where it is removed from the frame. An effective face-to-face seal between each refractory plate is provided by a spring-loaded lever 120 which forces the tube retaining plate 148 upwardly towards the sliding gate 17 and then pushes the sliding gate 17 onto the top plate 18. and press upward. A large radius lower portion 190 in the metal casing 184 of the sliding gate 17 allows the sliding gate to be guided across the opposite edge of the spring-loaded spout tube retaining plate 148 without damaging the spout tube retaining plate. Ru. The feed drive 68 is then actuated in the opposite direction to retract the pusher 74 to the position of FIG.
7' is inserted into the mounting part 58 of the valve frame 22 in its ready position in a manner similar to that described above for the insertion of the perforated sliding gate 17.

When you want to start flowing molten metal through the valve, open opening 11.
The flow of inert gas to rails 84, 8 is stopped and an integrally operating throttle drive 76 connects rails 84, 8.
4' and the sliding gate 17 held on the rail are actuated to move laterally within the cavity 115. Normally, the aperture drive 76 is operated to move the rails 84, 84' to bring the rails 84' into contact with the wall 194 of the cavity 115, thereby forcing the opening 180 of the sliding gate 17 into contact with the opening in the top plate 18. 112 in axial alignment. This defines the fully open position of the valve. Alternatively, when the flow rate of the molten metal is desired to be smaller than the full flow rate, the throttle drive body can be controlled so that the sliding gate 17 is placed at any intermediate position between fully open and fully closed, and the desired intermediate position can be achieved. It is possible to create a flow rate. Furthermore, during the pouring process, the position of the sliding gate can be changed to control the valve as desired by controlling the operation of the aperture driver 76 which applies a restrictive movement of the sliding gate 17 and its opening 180 relative to the top plate pouring opening 112. It is possible to increase or decrease the flow rate of the molten metal passing through it.

The present invention allows for easy replacement of both sliding gate 17 and spout tube assembly 19, either individually or together. When it is desired to replace a used sliding gate 17, a stop pin 200 is inserted into the hole 198 in the valve frame 22 to prevent movement of the spout tube assembly. The imperforate gate 17' is withdrawn from its ready position near the pusher 74 and a replacement sliding gate 17 is inserted in its place. Then the supply drive 6
8 to move the replacement gate into the working section 60 of the valve while discharging the spent gate through the discharge section 62.

In this procedure, the replacement gate 17 is connected to the magnet 1.
42 on the rail 84, any lateral position across the working portion 60 of the aperture rails 84, 84' can be achieved. Thus, when installed in the working part 60, the replacement gate 17 assumes the same throttle position as the used gate it is replacing.

When it is desired to replace the spout tube assembly 19, the aperture rails 84, 84' are actuated by the aperture drive 76 to move the sliding gate 17 to the fully closed position shown in FIG. Non-porous gate 17'
is pulled out from the valve frame. Next stop pin 20
0 is taken out of hole 198 and inserted into holes 196, 196'.
to prevent movement of the sliding gate 17 in the operating part. The replacement spout tube assembly 19 is then manually inserted through the guideway 94 in the mounting portion 58 of the valve frame 22 into a position near the pusher 74, and then the feed drive 68 is inserted into the replacement spout tube assembly. 19 into the operating position below the sliding gate 17 in the operating section 60 while moving the spent spout tube assembly into the guideway 136 of the discharge section 62.
It is then discharged.

Alternatively, when it is desired to replace both the sliding gate 17 and the spout tube assembly 19, the aperture drive 76
is actuated to move the rails 84, 84' and the sliding gate 17 in the actuating section to the fully closed position, and the stop pin 200 is withdrawn from the valve frame. The replacement sliding gate 17 and spout tube assembly 19 are installed in the guide passages 92 and 94 of the mounting portion 58, respectively.
and is inserted into a ready position near its pusher 74. Actuation of the feed drive 68 causes the replacement sliding gate and spout tube assembly to simultaneously move into the actuating portion 6.
0, while its used counterpart is ejected via the guide channels 134, 136 of the ejecting section 62.

EFFECTS OF THE INVENTION An important feature of the valve structure described herein is its ability to quickly stop the flow of molten metal through the valve independent of its throttling function. This feature is characterized in that the operation of the feed drive 68 for changing gates within the valve is completely separate from the operation of the throttle drive 76, and that the sliding gate 17 is placed in the working section 60 of the sliding gate throttle. This is achieved because it can be changed independently of position. During normal valve operation, the preferably imperforate sliding gate 17' is maintained in a ready position near the pusher 74. This sliding gate, like all sliding gates in the ready position, is connected to the magnet 142.
is attached to the rail 84 by and is thus moved laterally back and forth with the sliding gate 17 in the working part, thereby ensuring that the former is always aligned longitudinally with the latter. If it is necessary to quickly stop the flow of molten metal for some reason, for example due to a malfunction in the casting process, the sliding gate 17 in the operating section of the supply drive body 68 may be replaced with a non-porous gate 17'. It is only necessary that the The effect of this feature is that the sliding gate in the actuating section requires about 2 seconds to be moved by the aperture drive 76 from its fully open position to its fully closed position; Considering that it can be done in less than 0.2 seconds using a supply driver, it can be highly evaluated.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of the sliding gate valve of the present invention;
Figure 2 is a sectional view taken along line 2-2 in Figure 1;
The figure is a horizontal sectional view taken along line 3-3 in Figure 1.
The figure is a partially cutaway perspective view of a mounting plate implemented in the present invention, showing flow paths for cooling air and inert gas, and FIG. 5 is a partially cutaway perspective view of a top plate implemented in the present invention. 6 is a plan view of a sliding gate constructed according to the present invention, FIG. 7 is a perspective view of the sliding gate of FIG. 6, and FIG. 8 is a view from above of the valve frame structure of the present invention before assembly. FIG. 9 is a perspective view from below of the valve frame structure of FIG. 8. 10...Sliding gate valve structure, 12... Outlet,
14... Lining, 16... Pour tank, 17...
Effective gate, 17'... Non-perforated gate, 18... Top plate, 19... Output tube assembly, 22... Frame, 23... Mounting plate, 58... Mounting part, 60
... Actuation part, 62 ... Discharge part, 68 ... Supply driver, 74 ... Pusher, 76 ... Aperture driver, 84, 84' ... Rail, 112 ... Opening
142...Magnet, 144...Tube, 1
45... Opening, 146... Recess, 148... Holding plate, 149... Opening, 196, 198... Hole, 2
00...Pin.

Claims (1)

[Scope of Claims] 1. Opposed sliding gate support rails 8 connected to the pouring tank 16 and extending in the longitudinal direction, which serve as valves for controlling the flow rate of molten metal from the spout 12 of the pouring tank 16.
a frame 2 having an opposed tube support rail 140 disposed thereunder and extending approximately the same length as the sliding gate support rail 140 at 4,84';
2, a top plate 18 fixedly attached to the frame and having a through opening 112 in fluid communication with the spout 12 of the vat; and the sliding gate support rails 84,8.
a gate mounting portion 58 and a gate actuating portion 60 slidably supported on the top plate 4′ and extending below the top plate 18;
and a sliding gate 17, 17' moving sequentially inside said frame along a first movement path with a gate discharge portion 62; and said tube support rail 1.
40 and having a tube mounting portion 58, a tube actuation portion 60, and a tube evacuation portion 62 extending below said first movement path.
a spout tube assembly 19 that moves sequentially within said frame 22 along a movement path; and a first guide provided in said frame 22 for feeding said sliding gates 17, 17' to said gate mounting portion 58. 92, a second guide 94 provided on the frame 22 for feeding the spout tube assembly 19 to the tube mounting portion 58, and a sliding gate sequentially along the sliding gate support rails 84, 84'. a feed drive 68 for sequentially moving the gate and/or spout tube assembly 19 along the tube support rail 140; and the sliding gate support rail 84;
and a throttle drive body 76 for moving the throttle valve 84' in a horizontal direction perpendicular to its longitudinal direction. 2. The flow control valve according to claim 1, wherein the spout tube assembly 19 includes a tube support plate 148 that can engage and slide along the tube support rail 140. flow control valve. 3. A flow control valve according to claim 2, characterized in that the supply driver 68 includes a device 74 operative to move the spout tube assembly 19 along its rail 140. valve. 4. The flow control valve of claim 3, wherein movement of the sliding gate 17 and spout tube assembly 19 is selectively inhibited so that the supply driver 68 moves between the sliding gate 17 and the spout tube assembly 19. A flow control valve characterized in that it has a device 196, 198, 200 capable of moving the spout tube assembly 19 singly or jointly. 5. The flow control valve of claim 4, wherein the blocking device is located either at a position 196 across the movement path of the sliding gate 17 or at a position 198 across the movement path of the spout tube assembly 19. A flow control valve characterized in that it has a stop pin 200 that can be selectively placed. 6. In the flow control valve according to any one of claims 2 to 5, each of the tube support rails 140 is rotatably attached to the frame 22, and the tube support plate 148 is rotatably attached to the frame 22. A flow control valve comprising a series of levers 120 having one end engageable with the levers 120 and a spring 130 within the frame 22 providing an upward bias on the one end of each lever 120. 7. In the flow control valve according to claim 6, in which a valve mounting plate is interposed between the frame and the tank in order to connect the frame and the tank, the mounting plate 23 Flow control valve characterized in that it has a device 44 for supplying cooling fluid to the bore 126 in said frame 22 overlying the spring 130. 8. The flow control valve according to any one of claims 1 to 7, wherein the top plate 18 has an annular passage 174 located concentrically with respect to the through opening 112, and an inert portion in the passage 174. A flow control valve characterized in that it has a device 176 for supplying gas. 9. In the flow control valve according to claim 8, the through opening 166 of the top plate 18 has a diameter that gradually increases from one end of the opening to the other end, and has an axial direction for receiving a porous plug 168 having an opening. the plug has an outer surface 172 formed with axially spaced steps of decreasing diameter from one end of the plug to the other end of the plug;
The plug has an endmost step joined to a corresponding step in the axial opening in the body, and a step of the plug intermediate the endmost step has a diameter smaller than the diameter of the corresponding step in the axial opening. has a small diameter,
A flow control valve wherein said annular passageway 174 is defined therein. 10. The flow control valve according to claim 9, characterized in that a metal casing 162 is joined around the periphery of the top plate 18. 11 A top plate having a through opening 112 fixed to the spout 16 and in fluid communication with the spout 12 of the spout trough, which serves as a valve for controlling the flow rate of molten metal from the spout 12 of the spout 16; 18 and an opening 180, respectively.
Or the part without an opening is the through opening 112 of the top plate.
a sliding gate that is slidable along a sealed area around the through opening 112 in the top plate in close contact with the top plate 18 to permit or stop the flow of molten metal from the pouring tank 16 when aligned with the top plate; 17, 17' and
In a control valve having a spout tube assembly 19 having a tube support plate 148 closely spaced below the sliding gate, the tube support plate 148 is supported for sliding movement under the sliding gate. A frame 22 with a hollow interior comprising a tube support structure 140 and a spring device 130 combined with the tube support structure 140 for pressing the tube support plate 148 against the sliding gates 17, 17' is provided. combined with the outlet tank 16,
a drive operative to sequentially move the spout tube assembly 19 along a path of motion formed in the frame 22 to have a mounting portion 58, an actuating portion 60, and an ejection portion 62 of the spout tube assembly 19; A flow control valve characterized in that a device 68 is attached to the frame 22. 12. The flow control valve according to claim 11, wherein the frame 22 has a lateral opening communicating with the tube mounting portion for laterally inserting the spout tube assembly 19; Tube support structure 140 near the opening in the direction
is interrupted by said lateral opening, and the tube support structure opposite said lateral opening is interrupted by said lateral opening;
Flow control valve that is approximately the same length as all frame parts. 13. The flow control valve of claim 12, wherein the tube support structure 140 includes a plurality of spring biased levers 120 attached to the frame.