JPH0839234A - Fall prevention device for sliding nozzle plate - Google Patents

Abstract

PURPOSE:To provide such fall prevention device for a sliding nozzle plate as dispenses with the adjustment of a plate position, facilitates the attachment and solves problems of thermal influence and attraction of dirt. CONSTITUTION:A spring system 9, which generates a pressurizing force of 50 to 500N against a face 7' abutting on the metal frame 6 for storing a plate that becomes a reference at the time of sliding, is provided between the metal frame 6 and the plate. The spring system 9 may be structured as a curved thin leaf spring. Consequently, the plate does not fall, even if the frame is opened/closed at the time of changing the plate 2, by pressurizing the SN plate against the metal frame 6 with the spring system. The breaking of a masonry joint is prevented between the upper nozzle and the fixed plate. Follow-up is possible to the dimensional tolerance of a plate brick in the sliding direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for preventing a plate from slipping from a predetermined position and dropping when replacing a fixed plate and a sliding plate of a sliding nozzle device.

[0002]

2. Description of the Related Art A sliding nozzle (SN) plate is composed of a fixed plate and a sliding plate, which are fixed to a metal frame for use. When used up to the specified life, the used plate is replaced with a new plate.

In the method of fixing plates with bolts when performing plate replacement work, it is necessary to hold the plates with one hand so that the plates do not drop when the bolts are loosened both when the plates are removed and when they are attached. It was Especially when the used plate is removed, the temperature of the plate reaches several hundreds of degrees Celsius, and the worker is liable to burn. There is also the possibility of bruising the foot by dropping the plate.

Further, when the fixing plate connected to the upper nozzle is attached, the function of crimping the joint material with the upper nozzle and holding the state is also important in terms of preventing the molten metal from entering the joints. That is, once the joint material such as mortar is pressure-bonded with the upper nozzle and the upper plate to form joints of a predetermined thickness and then the upper plate is separated, joint breakage occurs, and the joint of molten metal during use of SN. Leads to intrusion.
Also, it sometimes leads to leakage of molten metal.

Particularly, in the system in which the plate is simply fitted into the metal frame like the device described in Japanese Patent Laid-Open No. 1-218761, it is indispensable to take measures to prevent the plate from dropping during the plate replacement work. As one of the measures, a method is used in which a magnet is arranged on the metal frame side to adsorb the metal kale surrounding the plate brick. However, due to the characteristics of the magnet, there are problems that the magnetic force is lost when the temperature becomes high, the metallic dust is adsorbed and the magnet portion rises, and the regular plate position is displaced.

[0006]

A problem to be solved by the present invention is to eliminate a sliding nozzle plate drop prevention device which eliminates the need for plate position adjustment, is easy to install, and solves the problems of heat influence and dust adsorption. To provide.

[0007]

According to the present invention, 50 to 500 is applied to the contact surface of the plate housing metal frame which is a reference during sliding.
The above-described problem was solved by providing a spring system for generating a force of N between the plate housing metal frame and the plate and pressing the SN plate by the spring system. The spring system can be a curved leaf spring.

[0008]

By pressing the SN plate against the metal frame by the spring system, the plate does not drop even if the metal frame is opened when replacing the plate, and the safety of the operator is ensured.

[0009]

EXAMPLES The present invention will be specifically described below with reference to examples. FIG. 1 shows an embodiment of the present invention, which is an application example of a two-plate sliding nozzle device (SN device) to a fixed plate 2 and a sliding plate 3. Steel ladle I
The molten steel that has entered passes through the upper nozzle 1 and is discharged to the outside of the pan I through the fixed plate 2, the sliding plate 3, and the lower nozzle 4.

These refractory materials are replaced every predetermined number of heats, and among them, the stationary plates 2, the sliding plates 3 and the lower nozzles 4 are particularly frequently replaced. In this embodiment, since the replacement work of the lower nozzle 4 is omitted,
The sliding plate 3 and the lower nozzle 4 are integrated in a metal case 12. The refractory material of the fixed plate 2 is mortar-fixed to a metal case 12 having a plurality of protrusions 5, and the protrusions 5 are accurately fitted into the recesses 7 of the fixed metal frame 6 so that the sliding plate 3 slides. Sliding direction (Fig. 1
It is stored so that it does not move to the left or right. Similarly, the refractory material of the sliding plate 3 is also housed so as to synchronize with the movement of the sliding metal frame 8 in the sliding direction.

When the predetermined life is reached in the state of FIG. 1, the pot I
Is tilted, and after cleaning oxygen in the holes of the upper nozzle 1 and the lower nozzle 4, refractory replacement work is performed. In the embodiment shown in FIG. 1, the working posture is such that the sliding cylinder 11 side is downward, and the SN device is opened in a door form so as to be divided by the sliding surface between the fixed plate 2 and the sliding plate 3 after the surface pressure is released. Be done. When opening, the fixed plate 2 loses the constraint of the sliding plate 3, and the sliding plate 3 loses the constraint of the fixed plate 2 and may easily fall into the open spaces and fall. A thin plate spring formed by bending a thin plate that can be pressed with a pressing force of 100 N against the contact surface 7'of the plate housing metal frame 6 that serves as a reference during sliding so that the fixed plate 2 and the sliding plate 3 do not fall. 9 is provided. This thin plate spring 9 is formed by bending a 0.5 mm thick spring steel thin plate,
The shape is as shown in FIGS. 2 and 3, and is approximately half the width of the fixed plate 2, that is, the width of the entire width in contact with the thin leaf spring 9. With the opened SN device, the fixed plate 2 and the sliding plate 3 exposed to the operator side are pulled out and removed by the operator.

When the pressing force of the thin leaf spring 9 is less than 50 N, the plate falls down, which causes inconvenience.
If it is more than 00N, the force of the operator is not exerted and the removal work becomes inconvenient.

Next, the work of mounting a new plate will be described. In this plate, mortar is applied to the dowel portion to form the joint 10 with the upper nozzle 1, and then the plate is put into the fixed metal frame 6 while being pressed against the upper nozzle 1 side. If the fixing plate 2 moves after being inserted once, the joints 10 formed at the corners are broken, and the molten steel seal during casting is hindered.
For this reason, a pressing system that does not return after the joint with the upper nozzle 1 is once formed is particularly required in the fixing plate 2 that needs to form the joint with another refractory. Figure 2
In this embodiment, the thin leaf spring 9 is fixed to the fixed metal frame 6 by the block 13 so that there is no play, and the pressing system does not return. When inserting the fixed plate 2 into the fixed metal frame 6, the operator usually takes the procedure of inserting the lower side of the plate first and depositing the plate weight in the metal frame 6 and then pushing the upper side.

When following the procedure, it is easier to work when the pressing system is located above. Further, when the plate is exchanged, it is easier to adjust the strength of the thin leaf spring 9 without the weight of the fixed plate 2 being received by the thin leaf spring 9 when it is above.
Further, a thin leaf spring having a curvature that is convex toward the operator side is provided in order to provide a guide action when the fixed plate 2 is pushed against the spring force. The thin leaf spring 9 can be replaced when it is deteriorated by heat. Also, in the unlikely event that an abnormal sliding resistance occurs in the event of a trouble with the SN device, blocks 13 locked to the metal frame are arranged at a distance of several mm on the back of the thin leaf spring 9 in order to keep the trouble small. It has a structure.

The bent thin leaf spring 9 preferably has a small spring constant so as not to change workability even when the size of the fixed plate 2 is changed, and sometimes it is attached with a bend in advance.

In the embodiment, the spring system is described as the bent thin leaf spring 9. However, it is natural that the same effect can be obtained by using a coil spring, an air spring or the like as the spring system. Further, in the embodiment, the metal frame 6 and the plate 2 are fitted with high precision so that the backlash at the time of sliding is not allowed. However, the present invention can be applied even when the backlash at the time of sliding can be tolerated by several mm. Is. That is, it is possible to prevent the plate from dropping when the plate is replaced by pressing it against one of the metal frames with a spring system.

Also, when the present invention is applied to the method of fixing the plate with bolts, it is possible to prevent the hot used plate from falling when the bolts are loosened and the operator from being burned.

[0018]

As described above, the present invention has the following effects. By pressing the SN plate against the metal frame with a spring system, the plate does not drop even if the metal frame is opened and closed when the plate is replaced. It is possible to prevent joint breakage between the upper nozzle and the fixing plate. Can follow the dimensional tolerance of plate bricks in the sliding direction.

[Brief description of drawings]

FIG. 1 is a sectional view of a sliding nozzle device including an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view showing a plate locking structure by a thin leaf spring according to an embodiment of the present invention.

FIG. 3 is a perspective view showing an example of a thin leaf spring mounting structure according to an embodiment of the present invention.

[Explanation of symbols]

I pan, 1 upper nozzle, 2 fixed plate, 3 sliding plate, 4 lower nozzle, 5 protruding part, 6 fixed metal frame, 7 concave part, 7'contact surface, 8 slide metal frame, 9 thin leaf spring, 10 joint, 11 sliding cylinders, 12 metal cases, 13 blocks

Claims (2)

[Claims] 1. A spring system for generating a pressing force of 50 to 500 N is provided between the plate housing metal frame and the plate against the plate housing metal frame contact surface which is a reference during sliding. Sliding nozzle plate fall prevention device. 2. The sliding nozzle plate fall prevention device according to claim 1, wherein the spring system is a curved thin plate spring.