JPH0740014A - Device for holding immersion nozzle - Google Patents

Abstract

PURPOSE:To obtain an immersion nozzle holding device having high safety, in which accurate and stable pushing force is obtd. without utilizing the fluid pressure as the pushing force and the fitting/separating of the immersion nozzle can easily and quickly be executed. CONSTITUTION:A trunnion shaft 26a is projectingly arranged to a nozzle holder 4 and supported at the tip part of a nozzle supporting arm 8. Further, the base end part of the nozzle supporting arm 8 is held to a guide stand 7 so as to be shiftable in the vertical direction through a spring. Then, both end parts of a lifting shaft 17 penetrating the intermediate part of the nozzle supporting arm 8 is loosely fitted into a cam groove 19 composed of mutually parallel double-level grooves 19a, 19b arranged to a cam plate 11 supported so as to be slidable to a guide stand 7 and an inclined groove 19c for connecting both double level grooves 19a, 19b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding device for a submerged nozzle mounted on the bottom surface of a molten metal container such as a ladle or a tundish when pouring molten steel into a mold of a continuous casting machine. .

[0002]

2. Description of the Related Art Generally, when pouring molten steel from a tundish into a mold in a continuous casting apparatus, it is particularly desirable to prevent contact between molten steel and air during pouring as much as possible. A method of mounting a dipping nozzle below a slide gate is widely adopted for pouring molten steel for use. By the way, the slide gate for controlling the opening and closing of the gate of the tundish and the flow rate of the molten steel poured into the mold from the tundish, and the dipping nozzle for guiding the molten steel discharged from this slide gate to the mold, Functions are different. Therefore, the materials (chemical components) are also different. Therefore, in general,
Both are molded and processed separately and are used as a single combination at the site of use.

On the other hand, for example, in the operation of continuous casting, the temperature of the metal and refractory around the submerged nozzle mounting portion changes with time during the preheating of the tundish, or from the start of casting to the end of casting. . That is, first
Since the temperature of the refractory material rises prior to the temperature of the metal object from the start of pouring to the beginning of pouring, the refractory material is restrained from thermal expansion by the metal object holding it, causing creep, and the cushioning property of the joint material. It may be damaged, or in some cases, an abnormal load may be generated to damage the mechanical device.

When the refractory is gradually heated to the surface as the casting continues, the metal directly holding the refractory and the peripheral metal are also heated. At this time, since the linear expansion coefficient is different between the metal object and the refractory material, the difference causes the metal object to expand more greatly when heated in the same way, so the holding power of the dipping nozzle is weakened, or in the extreme case, the holding power is increased. Can be lost and even a gap can be created between the dipping nozzle and the lower plate of the slide gate that contacts it.

When a gap is formed between the immersion nozzle and the lower plate of the slide gate in this way, air intrudes through this gap and oxidizes the molten steel due to contact with the molten steel, or the aluminum in the molten steel and the air. Alumina 30 is generated by the combination with oxygen in the inside, and the alumina adheres to the inner surface of the immersion nozzle 5 as shown in FIG. 8 to cause nozzle clogging, and further, due to the reaction between the refractory and oxygen. It causes various failures such as abnormal wear of refractory. Therefore, conventionally, when the immersion nozzle is continuously used for a long time, the looseness is inspected at regular intervals, and the tightening force is manually adjusted (re-tightening).

In order to eliminate such a problem, a means for adjusting the tightening force of the immersion nozzle due to the change with time during casting has already been proposed. One of them is as disclosed in JP-B-59-32439, JP-B-61-45967, JP-B-62-13730 and the like. In all of these, the support arm on which the immersion nozzle is placed is supported directly or by a cylinder through a link mechanism, and the pressing force of the immersion nozzle is obtained by hydraulic pressure or fluid pressure such as pneumatic pressure. It is a thing.

The other one is disclosed in Japanese Patent Laid-Open No. 50196/1993.
As disclosed in No. 1, the immersion nozzle is mounted on one end of the support arm, a spring is provided on the other end, and a vertical position adjusting member is provided in the middle part, and the gap nut of the vertical position adjusting member is used. The pressing force (spring pressure) of the immersion nozzle is adjusted.

Further, as a means for separating the lower plate (slide gate) from the immersion nozzle, as disclosed in Japanese Utility Model Laid-Open No. 5-33952, a protrusion provided on the outer periphery of the immersion nozzle case at the tip of the support arm. In addition to a groove for mounting the (trunnion shaft), a hook-shaped push-down engaging portion that is fixed to the outside of the support arm in correspondence with the groove and that is bent and protrudes above the groove portion. Proposed.

[0009]

Among the conventional means for adjusting the tightening force of the immersion nozzle, the former, that is, the one in which the immersion nozzle is pressed against the lower plate by the fluid pressure, adjusts the pressing force by controlling the fluid pressure. Therefore, as long as the fluid pressure is working normally, the adjustment can be done easily and accurately, but it is a very high temperature substance such as molten steel that is handled at a temperature of a few hundreds of degrees, and the working environment is high. Exposed. Therefore, if the fluid piping or the like breaks down or is damaged for some reason, the pressing force of the immersion nozzle due to the fluid pressure cannot be obtained at all, which may lead to a major accident such as the outflow of molten steel. Since it is not sufficiently satisfactory from the above, and since the unidirectional pressing force is only applied to the immersion nozzle, as mentioned above, alumina etc. adhere to the inner surface of the immersion nozzle during use and the lower plate and the immersion nozzle When the and are integrated, the lower nozzle and the submerged nozzle cannot be separated by simply releasing the pressing force.In this case, the work efficiency is poor because the worker or the like must separate them by applying an external force. It was

The latter, that is, the one in which the immersion nozzle is provided at one end of the arm and the spring is provided at the other end, and the middle of the arm is supported by the position adjusting member, does not use fluid pressure as in the former, but exclusively. Since the immersion nozzle is pressed against the lower nozzle by the spring force of the mechanical spring, there is no problem as described above due to damage to the fluid piping, and the reliability from the safety aspect is relatively high, but the spring pressure of the spring is high. Since the adjustment is performed by manually tightening the gap nut, it is necessary to adjust the gap nut every time the immersion nozzle is replaced, and the adjustment accuracy varies widely, and it is difficult to obtain a stable tightening force. Moreover,
Similar to the former case, since the pressing force in only one direction is simply added, if the pressing force of the immersion nozzle is not released and separation is not achieved, then an external force must be applied as in the former case. In addition, it was not satisfactory in terms of work efficiency.

Furthermore, in the means for separating the lower plate (slide gate) and the immersion nozzle disclosed in Japanese Utility Model Laid-Open No. 5-33952, the projection (trunnion shaft) mounted on the upper surface of the tip of the support arm is sandwiched. The holding arm for pushing down is fixed to the support arm, and a groove is provided to securely hold the protrusion on the support arm, and the protrusion is slid on the upper surface of the support arm to fit into the groove. It is troublesome to attach and detach because it is inserted, and moreover, it is necessary to provide a sufficient gap between the support arm and the locking portion for pushing down so that the protrusion can be smoothly inserted. In the state,
Furthermore, the gap between the upper surface of the protrusion and the lower surface of the lowering engaging portion is inevitably wide.

On the other hand, since the support arm and the push-down engaging portion are integrally fixed, they simultaneously move (elevate). For this reason, when the lower plate and the immersion nozzle are not separated only by lowering the support arm, the support arm is lowered to some extent, that is, after the support arm is lowered until it fills the gap between the upper surface of the protrusion and the lower surface of the pressing locking portion. For the first time, the depressing locking portion comes into contact with the upper surface of the protrusion to perform the depressing action, and until then, the immersion nozzle is held in an integrated state with the lower plate. Therefore, when the immersion nozzle is pushed by the pushing-down engaging portion and separated from the lower plate, a considerable gap is formed between the upper surface of the support arm and the lower surface of the protrusion, and the immersion nozzle is separated from the lower nozzle. As a result, the protrusion (immersion nozzle) will drop on the upper surface of the support arm due to impact, which is dangerous and inevitably causes damage to the immersion nozzle.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to obtain an accurate pressing force of the immersion nozzle without utilizing the fluid pressure as the pressing force between the lower plate and the immersion nozzle. It is an object of the present invention to obtain an immersion nozzle holding device which is easy to attach and detach the immersion nozzle, has a high degree of safety, and can maintain stable operation.

[0014]

According to the present invention, the trunnion shafts 26a and 26b are projected from the nozzle holder 4 in the holding device for holding the immersion nozzle on the bottom surface of the molten metal container through the slide gate. Then, the trunnion shafts 26a, 26b are supported by the tip end portion of the nozzle support arm 8, and the base end portion of the nozzle support arm 8 is held by the guide stand 7 via the spring 15 so as to be movable in the vertical direction. The stepped grooves 19a and 19b parallel to each other provided on the cam plate 11 slidably supported on the guide stand 7 at both ends of the lifting shaft 17 penetrating the intermediate portion of the nozzle support arm 8 and the stepped grooves 19a,
A submerged nozzle holding device characterized by being loosely fitted in a cam groove 19 formed of an inclined groove 19c connecting 19b, and more preferably, substantially in parallel with the nozzle supporting arm 8 and similarly to the nozzle supporting arm 8. , A nozzle pressing arm 9 whose base end is held by a guide stand 7 so as to be movable in the vertical direction via a spring 15, and an intermediate portion of the nozzle pressing arm 9 is provided with a sliding direction of the cam plate 11. Long holes 20 are provided in a direction intersecting with each other, both ends of a lift shaft 17 penetrating the long holes 20 are fitted into the cam grooves 19, and one end of the nozzle pressing arm 9 is immersed in a dipping nozzle. 5 is attached to the nozzle pushing down plate 22, and the nozzle pushing down arm 9 and the guide stand 7 are brought into contact with each other to regulate the movement of the nozzle pushing down arm 9. That the contact piece 23 and the stopper 24 provided to be able to obtain a submerged nozzle holding apparatus according to claim.

[0015]

[Operation] Trunnion shaft 26 projecting from nozzle holder 4
a and 26b are supported by the tip end portion of the nozzle support arm 8, and the base end portion of the nozzle support arm 8 is guided by the guide stand 7
And a cam plate 11 slidably supported by the guide stand 7 so that both ends of an elevating shaft 17 penetrating an intermediate portion of the nozzle support arm 8 are slidably supported by the guide stand 7. By loosely fitting the cam groove 19 which is provided with the mutually parallel step difference grooves 19a and 19b and the inclined groove 19c connecting the both step difference grooves 19a and 19b, the cam is driven by an appropriate driving means such as the hydraulic cylinder 12 described later. The position of the lifting shaft 17 can be moved from the lower groove 19a to the upper groove 19b or vice versa simply by sliding the plate 11 in the horizontal direction in the drawing, and the nozzle support arm 8 is rotated vertically. Because you can
The immersion nozzle can be easily attached and detached, and the base end of the nozzle support arm 8 is movably held in the vertical direction by the guide stand 7 via the spring 15 and is urged downward by the spring 15. The tip of the nozzle support arm 8 that supports the nozzle holder 4 is biased upward to obtain a predetermined pressing force.

A nozzle pushing arm 9 having a proximal end movably held in a vertical direction by a guide stand 7 via a spring 15 is provided substantially parallel to the nozzle support arm 8 as in the nozzle support arm 8. An elongated hole 20 is provided in the middle portion of the nozzle pushing arm 9 in a direction intersecting with the sliding direction of the cam plate 11, and the elongated hole 2 is provided.
The both ends of the lifting shaft 17 that penetrates 0 are fitted in the cam groove 19, and the tip of the nozzle pushing arm 9 is equipped with a nozzle pushing plate 22 whose one end can be engaged with the immersion nozzle 5. As described above, by sliding the cam plate 11 left and right to move the position of the elevating shaft 17 up and down, if the elevating shaft 17 rises and comes into contact with the upper surface of the elongated hole 20, the nozzle pressing arm 9 faces upward. When the elevating shaft 17 descends and comes into contact with the lower surface of the elongated hole 20, the nozzle pressing arm 9 rotates downward.
Therefore, when the immersion nozzle is attached or detached, the immersion nozzle can be held from above and below by both the nozzle support arm 8 and the nozzle pressing arm 9 over a predetermined stroke, and the attachment / detachment work can be performed. Even if the lower plate and the dipping nozzle are in a state where it is difficult to separate them due to the adherence, the forcible separation can be easily performed.

Further, the nozzle pressing arm 9 and the guide stand 7 are provided with the contact pieces 23 and the stopper 24 which contact the nozzle pressing arm 9 and restrict the movement of the nozzle pressing arm 9, respectively. Since the descending range can be limited, the gap between the tip of the support arm 8 and the tip of the push-down arm 9 can be widened, which facilitates mounting and dismounting of the immersion nozzle.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the embodiments shown in the drawings. 1 and 2, reference numeral 1 denotes a lower plate mounted on the bottom surface of a molten metal container such as a ladle or a tundish (not shown), which constitutes a part of the slide gate. The lower plate 1 is held on the bottom surface of a molten metal container (not shown) via a support metal 2. Reference numeral 3 denotes a submerged nozzle holding device, which is provided on the lower surface of the supporting metal member 2 and has a submerged nozzle 5 mounted on the lower plate 1 via a nozzle holder 4.
It is designed to be attached to and detached from the bottom surface of.

With reference to FIGS. 3 to 6 together, the immersion nozzle holding device 3 generally includes a base plate 6 fixed to the lower surface of the support metal 2, a guide stand 7 fixed to the lower surface of the base plate 6, and A support arm 8 and a push-down arm 9 supported by the guide stand 7, a slider 10 slidably supported by the guide stand 7, a cam plate 11 fixed integrally with the slider 10, and the slider 10 are slid. It is constituted by a hydraulic or pneumatic cylinder 12 for.

A spring case 14 is provided on the base end side (opposite the immersion nozzle side) of the guide stand 7 and is supported by the guide stand 7 via a pin 13 so as to be vertically movable by a predetermined amount. A spring 15 is inserted in the spring case 14. Reference numeral 16 is an elongated hole for allowing the pin 13 to move in the vertical direction, and when a load (immersion nozzle pressing force) more than a set value is applied to the tip end portion of the support arm 8 (immersion nozzle mounting side), a spring is formed. It is for compressing 15 to release the load (adjust the pressing force).

Further, the base ends of the support arm 8 and the push-down arm 9 are pivotally attached to the pin 13, respectively. An elevating shaft 17 is inserted through an intermediate portion between the supporting arm 8 and the push-down arm 9, and both ends of the elevating shaft 17 are fitted into cam grooves 19 described later via rollers 18. The hole through which the elevating shaft 17 is provided in the push-down arm 9 is an elongated hole 20 that is long in the vertical direction.

The slider 10 is guided and supported on the lower surface of the base plate 6 so as to be sandwiched by the guide stands 7 on both sides. Has been done. Further, the slider 10 has a lower surface on the lower surface thereof.
The cam plates 11 fixed integrally with are provided facing each other. As shown in FIG. 4, the cam plate 11 is provided with parallel grooves 19a and 19b which are staggered from each other and an inclined groove 19c which connects the parallel grooves 19a and 19b to each other.
The cam grooves 19 are formed of the above, and, as described above, both ends of the elevating shaft 17 are fitted into the cam grooves 19 via the rollers 18, respectively.

Further, at the tip of the support arm 8, there is provided a support portion 21 cut into a U shape on the upper surface.
A push-down plate 22 is attached to the tip of the push-down arm 9, and a contact piece 23 is provided in the middle. A stopper 24 protruding from the guide stand 7 is provided so as to cross the movement path of the contact piece 23. The contact piece 23 and the stopper 24 move the push-down arm 9 when they contact each other. Are regulated.

Further, the supporting arm 8 and the push-down arm 9 are fixed to either side of the tip end portions thereof,
A guide plate 25 extending to the other side is attached. The guide plate 25 functions as a guide when the support arm 8 and the push-down arm 9 move relative to each other, and the immersion nozzle 5 mounted on the support portion 21 of the support arm 8 allows both arms 8, 9 to move. Prevent intrusion between.

The holding mechanism for the immersion nozzle 5 will be described with reference to FIG. A large diameter portion 5a is provided on the outer periphery of the upper portion of the immersion nozzle 5, and the immersion nozzle 5 is held by the nozzle holder 4 such that the lower surface of the large diameter portion 5a is locked on the nozzle holder 4. There is. Then, the trunnion shafts 26 a, 26 protruding outward are provided on the nozzle holder 4.
b is fixed, and is mounted on the support portion 21 of the support arm 8 via the trunnion shafts 26a and 26b. The upper surface of the large-diameter portion 5a comes into contact with the push-down plate 22 attached to the tip of the push-down arm 9. Therefore, when the immersion nozzle 5 is placed on the nozzle holding device 3, the immersion nozzle 5 has the lower surface of the large diameter portion 5a supported by the support arm 8 via the nozzle holder 4 and pushes down the upper surface of the large diameter portion 5a. It is adapted to be supported by the push-down arm 9 via 22.

Next, the attaching / detaching operation of the immersion nozzle using the immersion nozzle holding device will be described. The embodiment shown in FIGS. 1 to 7 shows a state in which the immersion nozzle 5 is attached (pressed) to the lower plate 1, so first, the case of removing the immersion nozzle 5 will be described.

When the rod 12a is pulled in by operating the hydraulic or pneumatic cylinder 12, the slider 10 connected to the rod 12a and the cam plate 11 integrated with the slider 10 are slid to the right in the figure. At this time, since the lift shaft 17 having both ends fitted in the cam groove 19 penetrates the support arm 8 and the push-down arm 9, these arms 8 and 9 are used to form the cam plate 1.
The movement of 1 in the sliding direction is restricted. Therefore, the cam plate 1
When 1 slides, the elevating shaft 17 is moved downward in the drawing along the cam groove 19, and the support arm 8 and the push-down arm 9 whose base ends are pivotally supported by the pin 13 are synchronized with the pin 13 as a fulcrum. And rotate downward. Therefore, the immersion nozzle 5 in which the lower surface of the large-diameter portion 5a is supported by the support arm 8 via the trunnion shafts 26a and 26b and the nozzle holder 4 and the upper surface of the large-diameter portion 5a is brought into contact with the push-down plate 22 is , The lower plate 1 which is forced down in the figure
Separated from.

When the slider 10 is further slid to the right in the drawing and the support arm 8 and the push-down arm 9 are rotated, the abutment piece 23 provided at the intermediate portion of the push-down arm 9 and the guide stand 7 are moved. Protruding stopper 24
And abut each other, and further movement (lowering) of the push-down arm 9 is prevented, and thereafter, only the support arm 8 rotates and the elevating shaft 17 moves the parallel groove 19a below the cam groove 19.
When it moves to, the rotation stops. Therefore, the support arm 8
Is rotated more than the push-down arm 9, the gap between the tip of the support arm 8 on which the immersion nozzle 5 is placed and the tip of the push-down arm 9 is widened, and the immersion nozzle 5 placed on the support 21 is illustrated. It can be easily taken out from the support portion 21 by a detaching device or the like.

On the other hand, when the immersion nozzle 5 is mounted, contrary to the above, first, the cylinder 12 is retracted and the slider 10 is slid to the right in the figure, that is, the removal operation is completed. To In this state, the immersion nozzle 5 is placed on the support portion 21 by a desorption device or the like (not shown). At this time, as described above, since the gap between the tip of the support arm 8 and the tip of the push-down arm 9 is wide, the immersion nozzle 5 can be easily placed. Next, contrary to the case of the removal, the cylinder 12 is pushed out and the slider 10 is slid to the left in the figure, so that the elevating shaft 17 ascends as the cam groove 19 moves. Rotates upward with the pin 13 as a fulcrum. At this time, since the push-down arm 9 penetrates the elevating shaft 17 through the elongated hole 20, it does not rotate until the elevating shaft 17 contacts the upper surface of the elongated hole 20.

Therefore, the immersion nozzle 5 rises as the support arm 8 rises, but the push-down plate 22 attached to the tip of the push-down arm 9 remains stopped.
The large diameter portion 5a of the immersion nozzle 5 is lifted by raising the support arm 8.
The upper surface of the lower surface contacts the lower surface of the push-down plate 22. That is, the immersion nozzle 5 has its lower surface supported by the support arm 8 via the nozzle holder 4 and its upper surface supported by the push-down arm 9 via the push-down plate 22 so as to sandwich the large-diameter portion 5a. In this state, the elevating shaft 17 also abuts the upper surface of the elongated hole 20, so that the supporting arm 8 and the pushing down arm 9 ascend synchronously thereafter, and the immersion nozzle 5 comes into contact with the lower plate 1 and stops. At this time, the lifting shaft 17 has moved to the parallel groove 19b above the cam groove 19.

Therefore, in this state, since the elevating shaft 17 is held by the parallel groove 19b, the supporting arm 8 and the pushing down arm 9 have their intermediate portions therebetween.
Pivoted by 7. Further, the base end side (the side opposite to the immersion nozzle) of the support arm 8 and the push-down arm 9 has the pin 1
It is supported by the guide stand 7 via the guide 3 so as to be movable in the vertical direction by a predetermined amount, and is constantly pressed downward by the spring 15. Therefore, when an upward pressing force acts on the tip end portion of the support arm 8 (on the immersion nozzle mounting side), and a load (immersion nozzle pressing force) higher than a preset value is applied for some reason, the spring 1
5 is released to release the load, and conversely, when the load applied to the support arm becomes less than the set value, the spring 15 presses it. Therefore, the pressing force between the lower plate 1 and the immersion nozzle 5 is a predetermined pressing force by the spring force of the spring 15. Maintained in power.

[0032]

According to the present invention, the position of the elevating shaft 17 is changed from the lower groove 19a to the upper groove 19b, or vice versa, simply by sliding the cam plate 11 in the left-right direction in the drawing by an appropriate driving means. Can be moved to the nozzle support arm 8
Since the can be rotated up and down, the immersion nozzle can be easily attached and detached, and the base end of the nozzle support arm 8 is
Since the guide stand 7 is movably held in the vertical direction via the spring 15 and is urged downward by the spring 15, the tip of the nozzle support arm 8 that supports the nozzle holder 4 is urged upward and set to a predetermined position. A pressing force can be obtained. This pressing force can be set in advance, and the position of the lifting shaft 17 is simply changed from the lower groove 19a to the upper groove 1a.
Since it is uniquely set to a constant value simply by moving it to 9b, there is no need to control the end of the pressing force, and since fluid pressure such as hydraulic pressure or pneumatic pressure is not used as the pressing force, the fluid can be used even under severe operating conditions. There is no problem such as damage to the piping, and safety can be improved. Note that the hydraulic cylinder 12 is used as a drive means for sliding the cam plate 11, and even if the fluid pressure is lost for some reason, the pressing force of the spring 15 is still retained, resulting in an accident. There is no danger of being connected.

Further, when the immersion nozzle is attached or detached, the immersion nozzle can be held from above and below by both the nozzle support arm 8 and the nozzle pushing arm 9 over a predetermined stroke, so that the attachment and detachment work can be performed. Even if the lower plate and the immersion nozzle are in a state where it is difficult to separate them due to adhesion or the like, they can be easily separated by force.

Further, since the abutting piece 23 and the stopper 24 for restricting the movement of the nozzle pressing arm 9 are provided, the descending range of the nozzle pressing arm 9 can be limited, so that the tip portion of the supporting arm 8 and the pressing arm 9 can be restricted. The gap with the tip can be widened, and the work of mounting and removing the immersion nozzle becomes easy.

As described above, according to the present invention, since fluid pressure such as hydraulic pressure or pneumatic pressure is not used as the pressing force between the slide gate (lower plate) and the immersion nozzle, even under severe operating conditions. There is no problem such as damage to the fluid piping, and safety can be improved. In addition, since the accurate and stable pressing force of the immersion nozzle can be obtained and the immersion nozzle can be easily attached and detached, the stable operation can be maintained and the work efficiency can be improved. And so on.

[Brief description of drawings]

FIG. 1 is an overall side view showing an embodiment of the present invention.

FIG. 2 is a bottom view of FIG.

FIG. 3 is a partial cross-sectional side view showing an essential part of the present invention.

FIG. 4 is a side view of the cam plate portion of the present invention.

5 is a cross-sectional view taken along the line A of FIG.

FIG. 6 is a sectional view taken along the line B of FIG.

7 is a cross-sectional view taken along the line C of FIG.

FIG. 8 is a cross-sectional view showing a state of inner surfaces of a slide gate and an immersion nozzle.

[Explanation of symbols]

1 Lower Plate 2 Supporting Hardware 3 Immersion Nozzle Holding Device 4 Nozzle Holder 5 Immersion Nozzle 6 Base Plate 7 Guide Stand 8 Support Arm 9 Pushing Down Arm 10 Slider 11 Cam Plate 12 Cylinder 15 Spring 17 Lifting Shaft 19 Cam Groove 20 Long Hole 22 Nozzle Pushing Down Plate 23 Abutting piece 24 Stoppers 26a, 26b
Trunnion shaft

Claims (3)

[Claims] 1. A holding device for an immersion nozzle, which holds the immersion nozzle on the bottom surface of a molten metal container through a slide gate, wherein a trunnion shaft (26a, 2a) is attached to a nozzle holder (4).
6b), the trunnion shafts (26a, 26b) are supported by the tip end portion of the nozzle support arm (8), and the base end portion of the nozzle support arm (8) is connected to the spring (15).
The guide stand (7) is movably held in the vertical direction via the guide stand (7), and both ends of the lifting shaft (17) penetrating the intermediate portion of the nozzle support arm (8) are slid on the guide stand (7). Staggered grooves (19a, 19b) parallel to each other provided on a movably supported cam plate (11),
Inclined groove (19) that connects the two-level difference grooves (19a, 19b)
An immersion nozzle holding device which is loosely fitted in a cam groove (19) formed by (c). 2. The immersion nozzle holding device according to claim 1, wherein a base end portion of the nozzle (1) is substantially parallel to the nozzle supporting arm (8) and a spring (1) is formed in the same manner as the nozzle supporting arm (8).
5) a guide stand (7) is provided with a nozzle pressing arm (9) movably held in the vertical direction, and both ends of an elevating shaft (17) penetrating an intermediate part of the nozzle pressing arm (9). The guide stand (7)
It is loosely fitted in a cam groove (19) provided in a cam plate (11) slidably supported on the above, and one end of the nozzle pushing down arm (9) can be engaged with an immersion nozzle (5). Immersion nozzle holding device, characterized in that it is equipped with a different nozzle push-down plate (22). 3. The immersion nozzle holding device according to claim 2, wherein the cam plate (11) has a hole provided in an intermediate portion of the nozzle pushing arm (9) for penetrating the lifting shaft (17). Oblong hole (20) long in the direction intersecting the sliding direction of
The nozzle pressing arm (9) and the guide stand (7) are in contact with each other and restrict the movement of the nozzle pressing arm (9) (2).
3) An immersion nozzle holding device comprising a stopper (24).