JPH0733453U - Collector nozzle for sliding gate - Google Patents

Abstract

(57) [Summary] [Purpose] The main refractory material that constitutes the collector nozzle,
It suppresses the occurrence of cracks by absorbing the stress and impact applied to specific positions such as the position corresponding to the lower end of the bayonet hardware.
Improves durability and reliability. [Structure] A mortar 3 is provided between a main body refractory 1 which constitutes a nozzle main body and a metal case 2 which protects the main body refractory 1.
And a soft material such as ceramic fiber or a void is provided as a buffer zone 11 in the circumferential direction at a predetermined position between the main body refractory 1 and the metal case 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a collector nozzle for a sliding gate used for controlling the flow rate of molten metal in a molten steel ladle, a tundish, etc.

[0002]

[Problems to be solved by conventional techniques and devices]

 As a conventional collector gate for sliding gates used to control the flow rate of molten metal in molten steel ladle, tundish, etc., the outer periphery is protected by a metal case to protect the refractory body that constitutes the nozzle body. The one with the above structure is generally used.

4, 5, and 6 are cross-sectional views showing the structure of a conventional sliding gate collector nozzle. In the collector nozzle shown in FIG. 4, the metal case 2 is set in the main body refractory 1 by filling the entire space between the main body refractory 1 and the metal case 2 with mortar 3. Further, in the collector nozzle shown in FIG. 5, the outer circumference of a part of the metal case 2 set through the mortar 3 on the outer circumference of the main body refractory 1 composed of the upper large diameter portion 1a and the lower small diameter portion 1b. It has a structure in which the ceramic fiber 4 is attached so as to make one round. Further, in the collector nozzle shown in FIG. 6, the metal case 2 is set in the main body refractory 1 by directly fitting the metal case 2 in the main body refractory 1.

Then, the sliding gate collector nozzle having these structures is usually inserted into the bayonet metal piece 5 as shown in FIG. 7, and then the bayonet portion 6 of the bayonet metal piece 5 is hit with a hammer or the like to be tightened. It is attached by screwing it in and used.

By the way, as described above, the main body refractory 1 constituting the sliding gate collector nozzle is composed of the large diameter portion 1a and the small diameter portion 1b, and the neck portion (step portion) 7 is formed at the boundary thereof. Therefore, stress tends to concentrate on the neck 7, and cracks 9 (Fig. 7) tend to occur in the circumferential direction of the neck 7. However, this problem is caused by the shape of the refractory body 1 such as increasing the taper. The solution is tentatively solved by the method of preventing the concentration of stress by the change.

Since the bayonet hardware 5 is attached to the bayonet hardware 5 by hammering the bayonet portion 6 with a hammer or the like, it is circumferentially positioned near the lower neck straight body portion 8 corresponding to the lower end of the bayonet hardware 5. A crack 10 is likely to occur in the.

Of these, the cracks 9 in the neck portion 7 are caused by the fact that the neck portion 7 is in a position where stress is likely to be concentrated in shape, and cracks are generated by changing the shape such as increasing the taper. The problem has been solved for the time being.

However, the underbody straight body part 8 not only receives a shock when the bayonet part 6 of the bayonet metal fitting 5 is tightened at the time of mounting, but also when using a long nozzle, together with the sliding plate. When the long nozzle is configured to move, further stress is applied in a direction perpendicular to the axial direction of the collector nozzle, so that cracks occur near the lower body 8 corresponding to the lower end of the bayonet hardware 5. The reality is that we have not been able to sufficiently suppress or prevent the occurrence.

As described above, the conventional sliding gate collector nozzle is prone to cracking, and repeated use causes a large amount of cracking and steel leakage due to its progress. The actual situation is that the cracked parts are replaced with new ones. In the actual usage example of Steel Works A, it is not impossible to withstand the usage of about 4 times as an upper limit, but there are many variations in the number of times of usage, and it is troublesome for inspection and operation management, and there is a problem that efficiency is poor. is there.

This invention solves the above problems and suppresses the occurrence of cracks by absorbing the stress and impact applied to a specific position of the refractory body such as the position corresponding to the lower end of the bayonet metal object. It is an object of the present invention to provide a sliding gate collector nozzle that can be manufactured, has excellent durability, and is highly reliable.

[0011]

[Means for Solving the Problems]

 In order to achieve the above object, the sliding gate collector nozzle of the present invention constitutes a nozzle body in a sliding gate collector nozzle used for controlling the flow rate of molten metal in a molten steel ladle or a tundish. Mortar is filled between the main body refractory and the metal case that protects the main body refractory, and a soft material such as ceramic fiber or a gap is circumferentially provided at a predetermined position between the main body refractory and the metal case. It is characterized by being arranged as a buffer zone.

[0012]

[Action]

 In the sliding gate collector nozzle of this invention, mortar is filled between the metal cases that protect the main body refractory, and ceramic fibers such as ceramic fibers are used as a buffer zone in the circumferential direction at a predetermined position between the main body refractory and the metal case. Since a soft material or voids are installed, the impact such as when the bayonet part of the bayonet metal object is tightened when it is installed, and the local stress applied to a specific position of the refractory body during use. It is possible to suppress the occurrence of cracks by absorbing

[0013]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front sectional view showing a sliding gate collector nozzle according to an embodiment of the present invention, FIG. 2 is a plan sectional view, and FIG. 3 shows a main part of a sliding gate collector nozzle according to an embodiment of the present invention. It is an expanded sectional view shown.

The collector nozzle of this embodiment has a main body refractory 1 composed of an upper large diameter portion 1a and a lower small diameter portion 1b, and a shape corresponding to the main body refractory 1 set so as to cover the outside thereof. The mortar 3 is filled between the metal cases 2 which are provided, and a predetermined position between the main body refractory 1 and the metal case 2 (in this embodiment, a position corresponding to the lower end of the bayonet metal 5 having the bayonet portion 6). ) Is formed by disposing the ceramic fiber 11 as a buffer zone in the circumferential direction. In this example, the ceramic fiber (buffer zone) 11 was inserted together with the mortar 3 when the metal case 2 was fitted.

The dimensions of each part of the sliding gate collector nozzle of this embodiment are as follows: mortar thickness T ₁ : 2 mm Metal case thickness T ₂ : 2 mm Buffer zone thickness T ₃ : 2 mm Buffer zone width W: 30 mm .

When the collector nozzle of this example configured as described above was used as a collector nozzle for a sliding gate of a molten steel ladle of the A Works, it was confirmed that the collector nozzle can endure 4 or more times of use.

When the collector nozzle was cut and observed after four times of use, a crack (lateral crack) in the circumferential direction was generated in the inferior neck body portion 8, but the degree was slight. It was confirmed that the durability was clearly improved compared to the conventional collector nozzle.

In the above embodiment, the case where the ceramic fiber is provided as the buffer band has been described, but the method of forming the buffer band is not limited to the method of providing the ceramic fiber, and the ceramic band is not limited to the ceramic fiber. It is also possible to dispose soft materials other than fibers (for example, tapes made of materials such as paper and resin such as Styrofoam) at predetermined positions to form the buffer zone. It is possible to obtain the same effect as that of the embodiment.

Furthermore, the void portion may be formed in a band shape as a buffer band, and in that case, the same effect as that of the above-described embodiment can be obtained.

Further, in the above embodiment, the case where the buffer band is arranged at the position corresponding to the lower end of the bayonet metal of the main body refractory has been described, but the position of the buffer band is not limited to this. Instead, it is possible to dispose the buffer band at an arbitrary position effective for absorbing impact in consideration of the mounting mode and usage mode of the sliding gate collector nozzle.

The collector gate collector for a sliding gate according to the present invention is not limited to the above-mentioned embodiment in other points as well, and the dimensions and specific shapes of each part of the refractory body and the metal case, Various applications and modifications can be added within the scope of the invention.

[0022]

[Effect of device]

 As described above, the sliding gate collector nozzle of the present invention fills the space between the main body refractory that constitutes the nozzle body and the metal case that protects the main body refractory, and at the same time, the main body refractory and the metal refractory Since a soft material such as ceramic fiber or a void is arranged as a buffer band in the circumferential direction at a predetermined position between the cases, it is possible to hit the bayonet part of the bayonet metal at the time of mounting by tightening. , It becomes possible to suppress the occurrence of cracks by absorbing the local stress applied to the specific position of the refractory body during use.

Therefore, it becomes possible to improve the safety in use of the collector nozzle for the sliding gate in the molten steel ladle and the tundish, and to extend the service life (the number of times of use), thereby reducing the unit price and reducing the reliability. It can contribute to improvement.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a sliding gate collector nozzle according to an embodiment of the present invention.

FIG. 2 is a plan sectional view showing a sliding nozzle collector nozzle according to an embodiment of the present invention.

FIG. 3 is an enlarged sectional view showing a main part of a sliding gate collector nozzle according to an embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a conventional sliding gate collector nozzle.

FIG. 5 is a cross-sectional view showing another conventional collector gate for a sliding gate.

FIG. 6 is a sectional view showing still another conventional collector nozzle for a sliding gate.

FIG. 7 is a cross-sectional view showing a state in which a conventional sliding gate collector nozzle is tightened and attached to a bayonet metal object.

[Explanation of symbols]

1 refractory body 2 metal case 3 mortar 5 bayonet metal 6 bayonet part 7 neck (step) 8 under neck straight body part 11 ceramic fiber (buffer zone) T ₁ mortar thickness T ₂ metal case thickness T ₃ buffer zone Thickness W Buffer band width

Claims (1)

[Scope of utility model registration request] 1. In a collector nozzle for a sliding gate used for controlling the flow rate of molten metal in a molten steel ladle, a tundish, etc., a main body refractory forming a nozzle main body and a metal case for protecting the main body refractory. The sliding gate collector is characterized in that it is filled with mortar between the main body and a soft material such as ceramic fiber or a void portion is arranged as a buffer band in the circumferential direction at a predetermined position between the main body refractory and the metal case. nozzle.