JPH09323155A - Structure for preventing looseness of bayonet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent the looseness of a bayonet by arranging one or more of grooves in the radial direction on the circular direction of the spiral engaging surface at either one in an outer cylinder and an inner cylinder and fitting projection having elasticity inserted into the groove in the radial direction on the other engaging surface. SOLUTION: A refractory 22 sticking mortar 29 on the surface is fitted to a tapered opening hole part 21. Successively, the fastening plate 18 of a fastening metallic material 15 is inserted into a removing metallic material 14 through a fastening plate inserting groove 17. Thereafter, the second spiral engaging surface 18a of the fastening plate 18 is engaged with the first spiral engaging surface 16a of a receiving plate 16 by grasping a handle 23 and turning the fastening metallic material 15 to the receiving metallic material 14 in a prescribed turning direction. The pushing surface 20 of the fastening metallic material 15 to the refractory is gradually risen by engaging these spiral engaging surfaces 16a, 18a and the refractory 22 is intensely pressurized and fixed to the tapered opening hole part 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loosening prevention structure for a bayonet used for inserting, fixing or connecting a refractory material to a molten metal container.

[0002]

2. Description of the Related Art A refractory (for example, a porous plug) for injecting gas into the bottom of a molten metal container is inserted and fixed, or a flow rate of molten metal poured from a ladle or a tundish is controlled. A bayonet is commonly used to connect a lower nozzle to the bottom of a sliding nozzle device attached to the bottom of a pan or the like.

FIG. 6 and FIG. 7 show one form of such a bayonet. The bayonet 50 is used to insert and fix the porous plug into the bottom of the molten metal container, and as shown in the figure, the bayonet 50 is
It comprises a metal fitting 54 fixed to an iron skin 53 forming a bottom wall 52 of the molten metal container together with the bottom lining 51, and a tightening metal piece 55 engaged with the metal fitting 54.

As shown in the figure, the receiving member 54 is substantially composed of a cylindrical body having openings at both ends, the upper end opening thereof is fixedly connected to the iron shell 53, and the inner peripheral surface 18 of the lower end opening is formed.
A fan-shaped receiving plate 56 formed of a quarter arc is projected at a position facing each other by 0 °, and a first spiral engaging surface is formed on the upper surface of each receiving plate 56. Further, between these receiving plates 56, a pair of fan-shaped tightening plate fitting grooves 57 formed of quarter arcs are formed.

On the other hand, the tightening piece 55 is also substantially composed of a cylindrical body, and is passed through a pair of fan-shaped tightening plate fitting grooves 57 provided in the above-mentioned receiving piece 54 at positions opposite to each other by 180 ° on the upper peripheral surface thereof. A pair of tightening plates 58, each of which is formed of a quarter arc that can enter the inside of 54, is attached, and a second spiral engagement surface is formed on the lower surface of each tightening plate 58. Further, an upper plate 59 is integrally attached to the upper end opening of the tightening member 55.
A refractory pressing surface 60 is formed on the upper surface of the. Then, on the pressing surface 60, the lower surface of a refractory (a porous plug in the case shown) 62 mounted in the tapered opening 61 provided in the bottom wall 52 of the molten metal container is supported in a pressed state. There is.

In addition, 18 of the lower part of the cylinder of the tightening hardware 55 is used.
A pair of handles 63 are attached at positions facing each other by 0 °.

A method of using the bayonet 50 having such a structure will be described. First, the mortar 64 is attached to the surface of the refractory 62 and mounted in the tapered opening 61. Next, the tightening plate 58 of the tightening piece 55 is inserted into the receiving piece 54 through the tightening plate fitting groove 57. After that, the grip 63 is gripped and rotated in a predetermined rotation direction so that the first spiral engaging surface of the receiving plate 56 is engaged with the second spiral engaging surface of the tightening plate 58. Due to the engagement between the spiral engaging surfaces, the refractory pressing surface 60 of the fastening metal 55 gradually rises, and the refractory 62 is strongly pressed and fixed to the tapered opening 61. In the figure, 63
a is a gas supply pipe. 6 and 7, the tightening plate 58 has a fan shape, but the tightening plate 58 may have a rod shape. Further, there are also cases where three or more tightening plates 58 and receiving plates 56 are attached, respectively. FIG. 8 shows an example of a bayonet used when the lower nozzle 72 is attached to the sliding nozzle device. In this case, the fastening hardware 70 is provided with three fastening protrusions 70a, and the receiving hardware 71 is provided with three spiral grooves 71a. By mounting the lower nozzle 72 in the tightening hardware 71, inserting the tightening protrusion 70a of the tightening hardware 70 into the spiral groove 71a of the receiving hardware 71, and rotating and tightening the tightening hardware 70, as shown in FIG. As shown, the lower nozzle 72 is fixed to the lower plate 74. In addition, in FIG. 8, 73 is a handle.

[0008]

However, the prior art described above still has the following problems to be solved. For example, as shown in FIGS. 6 and 7, a bayonet 5 used for inserting and fixing a porous plug into the bottom of a molten metal container.
At 0, the tightening of the bayonet 50 may be loosened due to thermal expansion of the bayonet 50 itself due to repeated heating during use, or change in the shrinkage of the refractory material 62. When the tightening of the bayonet 50 becomes loose, the refractory 62 inserted and fixed becomes loose, and the refractory 62
There is a possibility that a gap is created between the tapered opening 61 and the tapered opening 61, and the molten metal leaks to the outside through this gap, resulting in a serious accident.

In order to solve such a problem,
For example, as shown in FIG. 10, the bottom wall 52 of the molten metal container
The refractory 62 consisting of a porous plug is attached to the bayonet 5
When inserting and fixing at 0, the handle 63 of the bayonet 50 and the connecting rod 64 attached to the bottom wall 52 of the molten metal container are fixed using the wire 65 and the turnbuckle 66 to prevent the bayonet 50 from loosening. There is a way to do it. However, since the position of the handle 63 is different every time after tightening the bayonet 50, there is a problem that the work becomes complicated and takes much labor.

Also, as shown in FIG.
There is also a method of providing a screw hole penetrating the side surface of the cylindrical body and screwing the fixing bolt 67 into this screw hole to tighten the bayonet 50. However, it takes time and the tightening force of the fixing bolt 67 is limited. , Could not completely prevent loosening. This also applies to the bayonet used when connecting the lower nozzle to the lower plate of the sliding nozzle device described above with reference to FIGS. 8 and 9.

The present invention has been made in view of the above circumstances, and it is possible to reliably prevent loosening of a bayonet in a bayonet used for inserting and fixing a refractory or connecting refractories. It is an object of the present invention to provide a bayonet loosening prevention structure.

[0012]

According to the present invention, there is provided a semiconductor device comprising:
The bayonet loosening prevention structure described is a refractory bayonet in which the inner cylinder holding the refractory is spirally engaged with the outer cylinder in a fixed state, of the outer cylinder and the inner cylinder,
One or two or more radial grooves are provided in the circumferential direction on one of the spiral engaging surfaces, and the protrusion having an elastic force is fitted into the radial groove on the other engaging surface. Is attached.

The structure for preventing loosening of the bayonet according to claim 2 is a refractory bayonet in which an inner cylinder holding a refractory is spirally engaged with an outer cylinder in a fixed state. On one of the opposing peripheral surfaces of the cylinder,
One or more axial grooves are provided in the circumferential direction,
A protrusion having an elastic force to be fitted into the groove is attached to the other opposing peripheral surface.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, with reference to the attached drawings, several embodiments embodying the present invention will be described for the understanding of the present invention.

(First Embodiment) First, referring to FIGS. 1 to 3, a basic structure of a bayonet 10 having a bayonet loosening prevention structure according to a first embodiment of the present invention will be described. explain. The present embodiment is a case where the refractory material 22 is a porous plug for blowing gas, which is attached to the bottom wall 12 of the molten metal container.

As shown in the figure, the bayonet 10 includes a bottom lining 11 and a receiving member 14 as an example of an outer cylinder in a fixed state which is fixed to a steel shell 13 which forms a bottom wall 12 of a molten metal container. A fastening hardware 15 as an example of an inner cylinder engaged with the hardware 14. The receiving member 14 is substantially composed of a cylindrical body having openings at both ends, the upper end opening thereof is fixedly connected to the iron shell 13, and the inner peripheral surface of the lower end opening is located at a position facing 180 ° to a quarter. A fan-shaped receiving plate 16 composed of one circular arc is provided so as to project.
A first spiral engagement surface 16 a is formed on the upper surface of 6. Further, between these receiving plates 16, a pair of fan-shaped tightening plate fitting grooves 17 formed of a quarter arc are formed.

On the other hand, the tightening piece 15 is also substantially formed of a cylindrical body, and is passed through a pair of fan-shaped tightening plate fitting grooves 17 provided in the above-mentioned receiving piece 14 at a position opposite to the upper outer peripheral surface by 180 °. A pair of tightening plates 18 each having a quarter arc that can enter the inside of 14 are attached, and a second spiral engaging surface 18 a is formed on the lower surface of each tightening plate 18.

Further, an upper plate 19 is integrally attached to the upper end opening of the tightening member 15, and a refractory pressing surface 20 is formed on the upper surface of the upper plate 19. Then, on the refractory pressing surface 20, the lower surface of the refractory 22 mounted in the tapered opening 21 provided in the bottom wall 12 of the molten metal container is supported in a pressed state. Also, tightening hardware 1
A pair of grips 23 are attached to the lower portion of the cylindrical body of No. 5 at 180 ° opposite positions.

Explaining how to use the bayonet 10 having such a structure, first, mortar 29 is formed on the surface.
The refractory material 22 attached with is attached to the tapered opening portion 21. Next, the tightening plate 18 of the tightening piece 15 is inserted into the receiving piece 14 through the tightening plate fitting groove 17. After that, by gripping the handle 23 and rotating the tightening metal piece 15 in a predetermined rotation direction with respect to the receiving metal piece 14, the tightening plate 18 is attached to the first spiral engagement surface 16 a of the receiving plate 16.
The second spiral engaging surface 18a of is engaged. Due to the engagement between the spiral engagement surfaces 16a and 18a, the tightening hardware 1
The refractory pressing surface 20 of No. 5 gradually rises, and the refractory 22 is strongly pressed and fixed to the tapered opening 21.

This embodiment is based on the above-mentioned bayonet 1.
It is characterized by adding a bayonet loosening prevention structure to the basic configuration of 0. That is, as shown in FIGS. 1 to 3, in the present embodiment, the second spiral engagement surface 18 provided on the pair of tightening plates 18 of the tightening piece 15 is provided.
Each a is provided with a plurality of radial grooves 24 at a predetermined pitch in the circumferential direction, preferably at equal intervals.

On the other hand, the first spiral engaging surface 16a of the pair of receiving plates 16 which engages with the second spiral engaging surface 18a of the tightening plate 18 by the relative rotation of the tightening member 15 with respect to the receiving member 14 has elasticity. One protrusion 25 with force
It is provided individually. As the protrusion 25, for example, a ball plunger can be preferably used.

Then, the tightening hardware 15 is received and the hardware 14 is
These projections 2 when rotated relative to
5 will each be fitted in any of the radial grooves 24 provided in the second spiral engagement surface 18a of the corresponding tightening plate 18.

As described above, in the present embodiment, even if the bayonet 10 itself thermally expands or the refractory 22 contracts due to repeated heating during use,
Since the projection 25 having elastic force is elastically fitted into the radial groove 24 and serves as a wedge, it is possible to reliably prevent the tightening plate 18 from reversely rotating in the loose side with respect to the receiving plate 16. You can Therefore, Bayonet 1
It is possible to reliably prevent the accidental leakage of the molten metal to the outside through the gap between the refractory material 22 and the tapered opening portion 21 caused by the looseness of tightening 0.

Further, in the present embodiment, since the projection 25 has an elastic force, when the tightening plate 18 is rotated relative to the receiving plate 16, the projection 25 elastically contracts, so that the radial direction is increased. The mountain portion formed between the grooves 24 can be easily overcome and the relative rotation described above is not hindered.

The relationship between the radial groove 24 and the projection 25 will be further described. The radial groove 24 may have any width as long as the tip of the projection 25 having an elastic force can be inserted therein. Determined by size. The length of the groove 24 in the radial direction may be a length long enough for the protrusion 25 having elastic force to be fitted therein.
The protrusion 25 can be fitted in the groove 24 in the radial direction even when the protrusion 25 is displaced from the center of the groove 4.

Further, in the present embodiment, each tightening piece 15 is provided with a plurality of radial grooves 24. This is when there is a variation in the insertion position, that is,
Even if the insertion position changes depending on the working conditions,
The loosening prevention structure of the bayonet is applicable. However, the number of the grooves 24 in the radial direction may be one. Specifically, the present invention can be applied to a case where the position where the fastening metal piece 15 is inserted and fixed is determined in advance or the insertion position of the fastening metal piece 15 into the receiving metal article 14 is managed in advance.

Further, although the intervals between the grooves 24 in the radial direction are equal in the present embodiment, they may be different. For example, in a porous plug, a plurality of porous plugs having the same length but different diameters may be used to control the protruding length from the brick, depending on the wear state of the brick. In this case, the lower end position of the inserted porous plug changes. In order to deal with such a case, the insertion position can be managed by arbitrarily changing the interval between the grooves 24 in the radial direction.

Further, in the present embodiment, the plurality of radial grooves 24 are provided in the circumferential direction on the second spiral engaging surface 18a, and the projection 25 having the elastic force on the first spiral engaging surface 16a. Attached, but can be reversed. That is, the protrusion 25 having an elastic force may be attached to the second spiral engagement surface 18a, and the plurality of radial grooves 24 may be provided in the circumferential direction on the first spiral engagement surface 16a. 1 and 2, 29a indicates a gas supply pipe.

FIG. 4 shows the structure of a bayonet 10A according to a modification of this embodiment. As shown, the bayonet 10A is the bayonet shown in FIGS. 1 to 3 except that height adjusting spacers 26 and 27 are provided between the refractory material 28 and the fastening plate 18 of the fastening hardware 15. Since they have the same configuration as 10, the same components are designated by the same reference numerals. In the present embodiment, the same bayonet 10A can be used by changing the height adjusting spacers 26 and 27 even if the refractories 28 have different sizes.

(Second Embodiment) In the present embodiment, as shown in FIG. 5, a lower sliding plate 31 of a sliding nozzle device 30 which is an example of a refractory material is attached to a lower nozzle which is an example of a refractory material. This is the case where 32 is connected using the bayonet 33.

As shown in the figure, the bayonet 33 is composed of a receiving piece 35 as an example of a fixed outer cylinder attached to a metal frame 34 supporting the lower plate 31, and an inner cylinder accommodating and supporting the lower nozzle 32. The tightening protrusion 36 is provided as an example, and the tightening protrusion 38 provided on the outer periphery of the tightening metal 36 fits into the spiral groove 35 a provided in the receiving metal 35 in a spiral shape and is tightened and fixed. . In addition to the spiral groove 35a described above, a plurality of axial grooves 39 are provided on the inner peripheral surface of the receiving member 35, and the tightening member 36 facing the inner peripheral surface of the receiving member 35 is provided.
Two protrusions 37 having an elastic force are provided on the outer peripheral surface of the.

With this structure, also in this embodiment, when the lower nozzle 32 is connected to the lower plate 31 by the bayonet 33, the protrusion 37 having an elastic force is elastically fitted into the axial groove 39, and the wedge is formed. Since the bayonet 33 itself thermally expands due to repeated heating during use or the refractory material such as the lower plate 31 and the lower nozzle 32 contracts, the tightening protrusion 38 has a spiral shape. It is possible to reliably prevent the reverse rotation of the groove 35a toward the loose side. Therefore,
It is possible to reliably prevent the accident of leakage of the molten metal to the outside through the gap between the lower plate 31 and the lower nozzle 32, which is caused by loose tightening of the bayonet 33.

[0033]

In the structure for preventing loosening of the bayonet according to the first aspect of the invention, the inner cylinder for holding the refractory is spirally engaged with the outer cylinder in the fixed state, and among these outer cylinder and inner cylinder,
One or two or more radial grooves are provided in the circumferential direction on one of the spiral engaging surfaces, and a protrusion having an elastic force to be fitted into the radial groove is provided on the other engaging surface. It is installed.

Therefore, even if the bayonet itself thermally expands due to repeated heating during use or the refractory material shrinks, the protrusions having elastic force are fitted into the radial grooves to form a wedge. Since it plays a role of, it is possible to reliably prevent the tightening metal from loosening and rotating in the reverse direction. Therefore, it is possible to surely prevent the molten metal from leaking out due to loose tightening of the bayonet, and to ensure the safety of operation. Also,
Since the work is simplified as compared with the conventional bayonet loosening prevention method, the work efficiency can be improved.

In the loosening prevention structure for a bayonet according to a second aspect of the present invention, the inner cylinder for holding the refractory is spirally engaged with the fixed outer cylinder, and either one of the outer cylinder and the inner cylinder is engaged. One or two or more axial grooves are provided in the circumferential direction on the opposite circumferential surface, and an elastic protrusion fitted into the groove is attached to the other opposite circumferential surface.

In this case, similarly to the structure for preventing loosening of the bayonet according to claim 1, even when the bayonet itself thermally expands or the refractory shrinks due to repeated heating during use, Since the protrusion having the elastic force is fitted into the groove in the axial direction and functions as a wedge, it is possible to reliably prevent the tightening metal from loosening and rotating in the reverse direction. Therefore, it is possible to reliably prevent the leakage accident of the molten metal caused by loosening of the bayonet and ensure the safety of operation, and the work is simplified as compared with the conventional method for preventing the loosening of the bayonet. Therefore, the work efficiency can be improved. Also, depending on where the bayonet is used and the structure of the bayonet,
Either can be selected and the usability of the bayonet loosening prevention structure can be improved.

[Brief description of drawings]

FIG. 1 is a front sectional view showing the overall structure of a bayonet including a bayonet loosening prevention structure according to a first embodiment of the present invention.

FIG. 2 is a bottom view of the same.

FIG. 3 is an exploded perspective view of the same.

FIG. 4 is a front sectional view of a bayonet loosening prevention structure according to a modification.

FIG. 5 is a front sectional view showing the overall structure of a bayonet including a bayonet loosening prevention structure according to a second embodiment of the present invention.

FIG. 6 is a sectional front view of a conventional bayonet.

FIG. 7 is a bottom view of the same.

FIG. 8 is an exploded perspective view of a conventional lower nozzle bayonet.

FIG. 9 is a front cross-sectional view showing the overall configuration of a conventional lower nozzle bayonet.

FIG. 10 is a bottom view of a conventional bayonet.

FIG. 11 is a bottom view of a conventional bayonet.

[Explanation of symbols]

10 Bayonet 10A Bayonet 11 Bottom lining 12 Bottom wall 13 Iron skin 14 Receiving hardware 15 Tightening hardware 16 Receiving plate 16a First spiral engaging surface 17 Fastening plate fitting groove 18 Tightening plate 18a Second spiral engaging surface 19 Top Plate 20 Refractory pressing surface 21 Tapered opening 22 Refractory 23 Handle 24 Radial groove 25 Protrusion 26 Height adjusting spacer 27 Height adjusting spacer 28 Refractory 29 Mortar 29a Gas supply pipe 30 Sliding nozzle device 31 Lower part Plate 32 Lower Nozzle 33 Bayonet 34 Gold Frame 35 Receiving Hardware 35a Spiral Groove 36 Tightening Hardware 37 Protrusion 38 Tightening Protrusion 39 Groove

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahide Yoshida 1-1 Higashihama-cho, Hachimansai-ku, Kitakyushu, Fukuoka Prefecture Kurosaki Ceramics Co., Ltd. Kurosaki Ceramics Co., Ltd.

Claims (2)

[Claims] 1. A refractory bayonet in which an inner cylinder holding a refractory is spirally engaged with an outer cylinder in a fixed state, wherein a spiral engaging surface of either one of the outer cylinder and the inner cylinder. Is provided with one or more radial grooves in the circumferential direction, and a protrusion having an elastic force fitted into the radial groove is attached to the other engagement surface. Bayonet loosening prevention structure. 2. A refractory bayonet in which an inner cylinder for holding a refractory is spirally engaged with an outer cylinder in a fixed state, wherein one of the outer cylinder and the inner cylinder has a facing peripheral surface. The loosening of the bayonet, characterized in that one or more axial grooves are provided in the circumferential direction, and a projection having an elastic force fitted into the groove is attached to the other opposing peripheral surface. Prevention structure.