JP3141335U - Ceramic liner device - Google Patents

Abstract

There is provided a ceramic liner device capable of tightening and fixing a ceramic piece, and in which an unreasonable load is not applied to the ceramic piece even when the ceramic piece is tightened.
A metal stud bolt 13 that is mounted in a through hole 11 of a square ceramic piece 12 in a plan view and is fixed to a metal base material 13 by stud welding, and a metal stud screwed into the stud bolt 13. In the ceramic liner device 10 having the nut member 15, an inner flange portion 16 having a truncated cone-shaped inclined surface 12 a that is reduced in diameter downward is formed on the lower portion of the through hole 11. Has an outer tapered surface 19 coinciding with the truncated cone-shaped inclined surface 12a, and further, a ceramic lid member 23 that is screwed into the stud bolt 14 and covers the through-hole 11 from the upper portion is provided at the upper portion of the nut member 15. ing.
[Selection] Figure 1

Description

The present invention relates to a ceramic liner device that can be easily and efficiently attached to a surface of a metal base material to prevent falling off.

Conventionally, the heat resistance of a device used in a high temperature atmosphere such as a furnace wall, a burner, or a blast furnace tuyere has been improved by providing a heat resistant protective layer for a ceramic piece on a metal base material. In addition, by utilizing the superior wear resistance of ceramics, a wear-resistant protective layer is formed by lining a ceramic piece on the metal base material of high-speed rotating equipment such as blowers and pumps, resulting in a long service life for high-speed rotating equipment. (See, for example, Patent Document 1).

The details of Patent Document 1 will be described with reference to FIGS. 3 (A) and 3 (B). When the front side is larger than the back side in plan view, a circular through hole 60 is provided. The ceramic piece 61, a metal stud bolt 63 that is mounted in the through hole 60 of the ceramic piece 61, the base portion of which is stud welded to the metal base material 62, and the stud bolt 63 are screwed together, and the through hole 60 is stepped. It has a nut member 65 that presses the portion 64, and a ceramic cap nut member 66 that covers the nut member 65. An adhesive 67 is also used between the ceramic piece 61, the nut member 65, and the cap nut member 66.

Utility Model Registration No. 3125040

However, in the technique described in Patent Document 1, the nut member 65 is made of metal, directly presses the stepped portion (that is, the inner flange portion) 64 of the ceramic piece 61, and the stepped portion 64 has a uniform thickness. There is no reinforcement at the base portion, and it does not have a sufficient thickness to withstand the tightening stress. Therefore, if the nut member 65 is tightened strongly, there is a problem that the stepped portion 64 is damaged or cracked.
On the other hand, Patent Document 1 discloses that a stud bolt is provided with a flange portion having a truncated cone-shaped inclined surface and a stepped portion of the ceramic piece is provided with a truncated cone-shaped inclined surface. Since the flange portion is fixed to the stud bolt, there is a problem that the tightening force does not work at all.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a ceramic liner device that can fasten and fix a ceramic piece and that does not apply an excessive load to the ceramic piece even when tightened. .

A ceramic liner device according to a first device for achieving the above object is rectangular in plan view and has a ceramic piece having a through hole formed in the center thereof, and is attached to the through hole of the ceramic piece. In a ceramic liner device having a metal stud bolt whose lower end is fixed to a metal base material by stud welding and a metal nut member screwed into the stud bolt,
An inner flange portion having a truncated cone-shaped inclined surface on the upper side is formed at the lower portion of the through-hole, and an outer tapered surface coinciding with the truncated cone-shaped inclined surface is formed on the outer side of the nut member. In addition, a ceramic lid member that is screwed onto the stud bolt and covers the through hole from above is provided on the nut member.
Here, the square means a shape in which ceramic pieces having the same shape are arranged on a plane with no gap or a slight gap, such as a quadrangle (square, rectangle, parallelogram), triangle, hexagon and the like.

A ceramic liner device according to a second device is the ceramic liner device according to the first device, wherein the lid member has a cap nut shape and can be screwed onto an upper portion of the stud bolt to be hung on the upper surface. Has a recess.

A ceramic liner device according to a third device is the ceramic liner device according to the first and second devices, wherein the frustoconical inclined surface is located to the lower end of the inner flange portion.

A ceramic liner device according to a fourth device is the ceramic liner device according to the first and second devices, wherein the inner flange portion has a cylindrical portion, and the frustoconical inclined surface is formed on the cylindrical portion. Located up to the top.

And the ceramic liner apparatus which concerns on 5th invention is a ceramic liner apparatus which concerns on 1st-4th invention, The inclination-angle of the said truncated cone-shaped inclined surface exists in the range of 15-75 degree | times with respect to horizontal. .

In the ceramic liner device according to any one of claims 1 to 5, an inner flange portion having a truncated cone-shaped inclined surface which is reduced in diameter downward is formed on the lower portion of the through hole, and a truncated cone shape is formed on the outer portion of the nut member. It has an outer tapered surface that coincides with the inclined surface, and further, a ceramic lid member that is screwed onto the stud bolt and covers the through hole from the upper portion is provided on the upper portion of the nut member. Although the inner flange portion of the ceramic piece is pressed downward, the inner flange portion is thicker toward the outside in the radial direction, and therefore has sufficient strength to withstand the tightening force.
Further, since a part of the load of the nut member is distributed also on the radially outer side of the inner flange portion, self-alignment ensures the positioning of the ceramic piece in the front-rear and left-right directions, and the fastening force is also eased.

Further, in the ceramic liner device according to claim 2, since the lid member has a cap nut shape and can be screwed onto the upper portion of the stud bolt and has a latching recess on the upper surface, the metal base material The entire surface of the ceramic liner device attached to the can be ceramic.

In the ceramic liner device according to claim 3, since the truncated cone-shaped inclined surface is located up to the lower end of the inner flange portion, the length of the inclined surface can be increased, and the inclination angle with respect to the horizontal plane can be increased. it can.

In the ceramic liner device according to the fourth aspect, since the lower portion of the inner flange portion has a cylindrical portion and the truncated cone-shaped inclined surface is located up to the upper end of the cylindrical portion, the thickness of the inner flange portion can be increased. Furthermore, the inner thickness of the inner flange portion can be secured to some extent, and inner chipping of the inner flange portion can be prevented.

And in the ceramic liner device according to claim 5, since the inclination angle of the truncated cone-shaped inclined surface is in a range of 15 to 75 degrees with respect to the horizontal, when the angle of the inclined surface is close to 15 degrees, The function as a flange portion can be maintained, and when it is close to 75 degrees, the effect as a wedge is exhibited, the bending or bending stress on the base side of the inner flange portion is reduced, and the inner flange portion is more firmly secured. Can be fixed to a metal base material.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIGS. 1A and 1B are a side sectional view and a plan view of the ceramic liner device according to the first embodiment of the present invention, respectively, and FIGS. 2A and 2B are respectively the views of the present invention. It is the sectional side view and top view of the ceramic liner apparatus which concern on 2nd Embodiment.

As shown in FIGS. 1A and 1B, the ceramic liner device 10 according to the first embodiment of the present invention has a square shape in plan view and a ceramic piece having a through hole 11 formed in the center. 12 and a metal stud bolt 14 which is attached to the through hole 11 of the ceramic piece 12 and whose lower end is fixed to the metal base material 13 made of carbon steel or stainless steel which is an attachment target by stud welding, And a metal nut member 15 screwed into the stud bolt 14. These will be described in detail below.

The ceramic piece 12 is, for example, a square or rectangle having a side dimension of 15 to 150 mm in a plan view, a thickness of 3 to 30 mm, and is formed of alumina, zirconia, sialon, silicon nitride, or silicon carbide. And the lower part of the through-hole 11 has the inner flange part 16 which equips the upper part (namely, upper surface) with the truncated cone-shaped inclined surface 12a diameter-reduced below. The frustoconical inclined surface 12a is located up to the lower end of the inner flange portion 16, and the inclination angle α of the inner flange portion 16 is in the range of 15 to 75 degrees with respect to the horizontal plane. The range of 50 to 75 degrees is preferable. Accordingly, the thickness of the periphery of the inner flange portion 16, that is, the root portion can be increased, and the horizontal strength of the root portion (radially outer side) can be increased.

The inner diameter d1 on the upper side of the through hole 11 is preferably about 0.15 to 0.7 times the outer dimension of the ceramic piece 12. Moreover, it is preferable that the inner diameter d2 of the lower end of the through-hole 11 exists in the range of 0.15-0.9 (more preferably 0.3-0.9) of the inner diameter d1.

The stud bolt 14 disposed at the center of the ceramic piece 12 is a full screw (outer male screw), for example, an outer diameter of 3 to 10 mm, and is formed of an iron material such as carbon steel or stainless steel, and its base is a metal mother. It is fixed to the material 13 by welding. Although the protrusion 17 is provided at the tip of the stud bolt 14 before welding, the protrusion 17 disappears after welding, and the lower end surface 18 of the stud bolt 14 is fixed to the metal base material 13. The height of the stud bolt 14 is, for example, about 0.5 to 0.8 times the height of the ceramic piece 12. In addition, the lower end surface 18 of the stud bolt 14 can be enlarged to form a flange.

The nut member 15 is made of ordinary steel or stainless steel, and has an outer tapered surface 19 that completely coincides with the truncated cone-shaped inclined surface 12a on the lower surface (outer portion). At the center, a female screw 20 that is screwed with the external male screw of the stud bolt 14 is provided. The height of the nut member 15 is preferably 0.8 to 1.2 times that of the truncated cone-shaped inclined surface 12a. When the upper portion of the nut member 15 protrudes from the truncated cone-shaped inclined surface 12a, the portion becomes a columnar shape, and the outer diameter thereof is, for example, about 0.91 to 0.99 of the diameter d1 of the through hole 12. It has become. Further, a small hole 22 which is an example of two or more latching depressions for tightening the nut member 15 with a tool is provided on the upper surface of the nut member 15.

The upper part of the nut member 15 is covered with a cap nut member 23 (an example of a lid member) made of the same material as that of the ceramic piece 12 or made of another kind of ceramic. The diameter of the cap nut member 23 is, for example, about 0.91 to 0.99 times the diameter d1 of the through hole 11, and the height is, for example, about 0.2 to 0.5 times the height of the ceramic piece 12. A female screw 24 that is screwed into the stud bolt 14 is formed at the lower center. When the cap nut member 23 is screwed to the stud bolt 14 in the state of FIG. 1, a space 26 can be formed at the upper end of the female screw 24, and the cap nut member 23 is sufficiently screwed to the stud bolt 14. It can be made to.

Further, on the upper surface of the cap nut member 23, a small hole 27 which is an example of two or more latching recesses for tightening the cap nut member 23 with a tool is provided. In this embodiment, the upper surface of the cap nut member 23 is completely covered with ceramic. However, the stud bolt 14 can be lengthened and a female screw screwed into the stud bolt 14 can be vertically penetrated.

In the construction of the ceramic liner device 10, the stud bolt 14 is vertically welded to a predetermined position of the metal base material 13, the through hole 11 of the ceramic piece 12 is inserted into the stud bolt 14, and the nut member 15 is attached to the stud. Screwed onto the bolt 14. Thus, the ceramic piece 12 is positioned and is securely fixed to the metal base material 13. Then, a ceramic cap nut member 23 is screwed onto the stud member 14 on the nut member 15. In order to prevent loosening of the nut member 15 and the cap nut member 23, an adhesive may be inserted between the male screw and the female screw.

Next, a ceramic liner device 30 according to a second embodiment of the present invention shown in FIG. 2 will be described.
As shown in FIGS. 2A and 2B, the ceramic liner device 30 according to the second embodiment of the present invention has a square shape in plan view and a ceramic piece having a through hole 31 formed in the center. 32, and a metal stud bolt 34 which is attached to the through hole 31 of the ceramic piece 32 and whose lower end portion is fixed to the metal base material 13 formed of carbon steel or stainless steel which is an attachment target by stud welding. And a metal nut member 35 screwed into the stud bolt 34, and a ceramic nut member 36 as an example of a ceramic lid member thereon. These will be described in detail below.

The ceramic piece 32 is, for example, a square or rectangle having a side dimension of 15 to 150 mm in a plan view, a thickness of 3 to 30 mm, and is formed of alumina, zirconia, sialon, silicon nitride, or silicon carbide. A frustoconical inclined surface 37 whose diameter is reduced downward is provided on the upper side (that is, the upper surface) below the through hole 31, and an inner flange portion 39 in which a cylindrical portion 38 is formed is provided therebelow. ing. The inclination angle β of the upper surface of the inner flange portion 39 is in the range of 15 to 75 degrees with respect to the horizontal plane, but in this embodiment, it is preferably in the range of 20 to 45 degrees. Accordingly, the thickness of the inner flange portion 39 can be secured, the thickness of the root portion can be increased, and the horizontal strength of the root portion (radially outer side) can be increased.

The inner diameter d3 on the upper side of the through hole 31 is preferably about 0.15 to 0.7 times the outer dimension of the ceramic piece 32. The inner diameter d4 at the lower end of the through hole 31 is preferably in the range of 0.15 to 0.9 (more preferably 0.3 to 0.9) of the inner diameter d3.

The stud bolt 34 disposed at the center of the ceramic piece 32 is a full screw (outer male screw), for example, an outer diameter of 3 to 10 mm and is formed of an iron material such as carbon steel or stainless steel, and its base is a metal mother. It is fixed to the material 13 by welding. Although the protrusion 40 is provided at the tip of the stud bolt 34 before welding, the protrusion 40 disappears after welding, and the lower end surface 41 of the stud bolt 34 is fixed to the metal base material 13. The height of the stud bolt 34 is, for example, about 0.9 to 1.2 times the height of the ceramic piece 32. In addition, the lower end surface 41 of the stud bolt 34 can be enlarged to form a flange.

The nut member 35 is made of plain steel or stainless steel, and has an outer tapered surface 42 that completely coincides with the truncated cone-shaped inclined surface 37 on the lower surface. At the center, a female screw 44 that is screwed with the external male screw of the stud bolt 34 is provided. The height of the nut member 35 is preferably 0.9 to 1.3 times that of the truncated cone-shaped inclined surface 37. When the upper portion of the nut member 35 protrudes from the truncated cone-shaped inclined surface 37, the portion becomes a columnar shape, and the outer diameter thereof is, for example, about 0.91 to 0.99 of the diameter d3 of the through hole 32. It has become. The upper surface of the nut member 35 is provided with a small hole 45 as an example of two or more latching recesses for tightening the nut member 35 with a tool.

An upper portion of the nut member 35 is covered with a ceramic nut material 36 made of the same material as the ceramic piece 32 or made of another kind of ceramic. The diameter of the ceramic nut member 36 is, for example, about 0.91 to 0.99 times the diameter d3 of the through hole 31, and the height is, for example, about 0.2 to 0.5 times the height of the ceramic piece 32. A female screw 46 is formed at the center to be screwed into the stud bolt 34.

Further, on the upper surface of the ceramic nut member 36, a small hole 47 which is an example of two or more latching recesses for tightening the ceramic nut member 36 with a tool is provided. In this embodiment, the stud bolt 34 is exposed from the upper surface of the ceramic nut member 36. However, the stud bolt 34 can be made invisible from above as a cap nut shape.

In the construction of the ceramic liner device 30, the stud bolt 34 is vertically welded to a predetermined position of the metal base material 13, and the through hole 31 of the ceramic piece 32 is fitted (covered) into the stud bolt 34. Is screwed onto the stud bolt 34. As a result, the ceramic piece 32 is positioned and securely fixed to the metal base material 13. Then, the ceramic nut material 36 is screwed onto the stud bolt 34, and the ceramic nut material 36 is covered on the nut member 35. In order to prevent the nut member 35 and the ceramic nut member 36 from being loosened, an adhesive may be inserted between the male screw and the female screw.

As mentioned above, although embodiment of this invention was described, this invention is not limited to this embodiment, The change in the range which does not change the summary of invention is possible, Each above-mentioned implementation is possible. The case where the ceramic liner device of the present invention is configured by combining some or all of the forms and modifications is also included in the scope of the right of the present invention.
For example, in the above-described embodiment, the length of the stud bolt is constant. However, the stud bolt may be longer than the stud bolt to be used, and may be cut at a predetermined position after welding or folded with a crease in advance. it can.
Moreover, although the ceramic was used as a hard material which has heat resistance and abrasion resistance, a cemented carbide alloy and a cermet can also be used.
In the present invention, it is also possible to use a hard resin piece, a rubber piece, or a cemented carbide piece instead of the ceramic piece.
In the above embodiment, specific numbers are used for easy understanding. However, the present invention is not limited to these numbers, and numerical values within a range not changing the gist of the present invention. Changes are possible.

(A), (B) is a sectional side view and a plan view of the ceramic liner device according to the first embodiment of the present invention, respectively. (A), (B) is a sectional side view and a plan view of a ceramic liner device according to a second embodiment of the present invention, respectively. (A), (B) is a sectional side view and a plan view of a ceramic liner device according to a conventional example, respectively.

Explanation of symbols

10: Ceramic liner device, 11: Through hole, 12: Ceramic piece, 12a: Frustum-shaped inclined surface, 13: Metal base material, 14: Stud bolt, 15: Nut member, 16: Inner flange, 17: Protrusion, 18: lower end surface, 19: outer tapered surface, 20: female screw, 22: small hole, 23: cap nut member, 24: female screw, 26: space, 27: small hole, 30: ceramic liner device, 31: through hole, 32 : Ceramic piece, 34: Stud bolt, 35: Nut member, 36: Ceramic nut material, 37: Frustum-shaped inclined surface, 38: Cylindrical portion, 39: Inner flange portion, 40: Projection, 41: Lower end surface, 42: Outer taper surface, 44: female thread, 45: small hole, 46: female thread, 47: small hole

Claims (5)

A ceramic piece that is square in a plan view and has a through hole formed in the center thereof, and is attached to the through hole of the ceramic piece, and its lower end is fixed to a metal base material that is an attachment object by stud welding. In a ceramic liner device having a metal stud bolt and a metal nut member screwed into the stud bolt,
An inner flange portion having a truncated cone-shaped inclined surface on the upper side is formed at the lower portion of the through-hole, and an outer tapered surface coinciding with the truncated cone-shaped inclined surface is formed on the outer side of the nut member. The ceramic liner device further includes a lid member made of ceramic that is screwed onto the stud bolt and covers the through hole from above. The ceramic liner device according to claim 1, wherein the lid member has a cap nut shape, can be screwed onto the upper portion of the stud bolt, and has a latching depression on the upper surface. Ceramic liner device. 3. The ceramic liner device according to claim 1, wherein the frustoconical inclined surface is located up to a lower end of the inner flange portion. 4. 3. The ceramic liner device according to claim 1, wherein a cylindrical portion is provided at a lower portion of the inner flange portion, and the frustoconical inclined surface is located up to an upper end of the cylindrical portion. A ceramic liner device characterized by that. 5. The ceramic liner device according to claim 1, wherein an inclination angle of the frustoconical inclined surface is in a range of 15 to 75 degrees with respect to the horizontal.

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