JPH01176552A - Method for lining and fixing ceramics to inner surface of pipe - Google Patents

Abstract

PURPOSE:To prevent the release of the ceramic lining layer provided to the inner surface of a pipe even under an adverse condition, by connecting ceramic segments by a connection member to form a long cylindrical body and inserting said cylindrical body in a pipe to weld necessary places by current supply welding using a welding pin to fix the ceramic segments. CONSTITUTION:Two stepped ceramic segments 2 are arranged so that the step parts 3 are opposed to each other and connection members 5 are inserted through the piercing holes 9 of said segments. Next, two ceramic segments 1 each having no step part are arranged by inserting the connection members 5 through the piercing holes 9 thereof. Thereafter, in the same combination, two stepped ceramic segments 2 and two ceramic segments 1 are alternately arranged to be connected in a long cylindrical shape and this cylindrical body is inserted in a pipe housing 4. Welding pins 6 are inserted in the pipe housing 4 from the stepped pin holes 10 preliminarily bored in said housing 4 at the pitch having the thickness corresponding to four ceramic segments and pressed by the electrode holders mounted to electrode grasping flanges 8 and voltage is applied between the connection members 5 and the welding pins 6 to weld and fix the contact parts of the connection members 5 and the welding pins 6.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for attaching a ceramic having such properties to the inner surface of a pipe that requires wear resistance, corrosion resistance, heat resistance, etc.

(Conventional technology) Portions of pipes that transport or pump powder or slurry materials that are subject to severe internal wear or damage must be coated with abrasion-resistant, corrosion-resistant, and heat-resistant ceramics, etc. Conventionally, a ceramic liner has been adhered to the inner surface of the pipe to cover it, or the pipe itself has been cast and molded with ceramic.

(Problems to be Solved by the Invention) However, with this conventional method of adhering and coating the inner surface of the pipe with a ceramic liner, the oil and
Excessive surface treatment such as removal of moisture and dirt must be carried out strictly, and in the case of the inner surface of the pipe, it is difficult both technically and cost-wise to perform these operations completely.
If the working environment conditions such as temperature and humidity during bonding work are inappropriate, the work will be subject to Class 4 restrictions, such as making it impossible to carry out the work or causing large variations in bond strength even if the work is carried out forcibly. .

Furthermore, even if the work is carried out in a favorable working environment, the strength of the adhesive may decrease due to the usage conditions (temperature, humidity, etc.) of the equipment to which the Ceramimecliner is attached, causing it to peel off from the inner surface of the pipe. Due to the performance of the adhesive in a high temperature atmosphere (especially in a high temperature range of 150°C or higher)
However, there is a problem that the adhesive and strength deteriorate rapidly, making it unusable.

In addition, when the pipe itself is cast and molded from ceramic, there are problems such as poor wear resistance because the pipe is not a press-molded product, and the manufacturing process is complicated, resulting in long manufacturing time and high costs. Ta. In addition, cast molded products are
Due to the limited capacity of the sintering furnace and the capacity of the processing machine during machining, both length and diameter are limited in manufacturing, and there is a problem that long items or large diameter items cannot be manufactured.

(Means for Solving the Problems) The present invention has been made to solve the problems of the conventional art, and the ceramic lining the inner surface of the pipe peels off even under adverse conditions such as high temperature, high humidity, and vibration. Furthermore, the present invention provides a method of coating the inner surface of a pipe with a ceramic of a new concept, which is not affected by working environment conditions at the time of measuring, conditions of surface treatment, etc., and can be made at low cost.

The gist is as follows: 1) A ring-shaped ceramic segment with a through hole penetrating both planes; A ring-shaped step or a ceramic segment with a hole is prepared, and a plurality of these two kinds of ceramic segments are arranged in a row, and a long connecting member is arranged in the row. The welding pin is inserted into the through holes of the plurality of arranged ceramic segments, and the continuous ceramic segments are inserted into the pipe, and the welding pin is inserted through the pin hole drilled in the pipe wall on the latter stage or the stepped part of the ceramic segment with holes. Insert it and touch the tip to the connecting member surface,
In this state, a voltage is applied between the welding pin and the connecting member to weld the tip of the welding pin and the connecting member, and the welding pin is further fixed to the pipe to integrate it, and the long connecting member and welding pin are bonded together to form a ceramic material. A method of coating and fixing a ceramic on the inner surface of a pipe characterized by fixing the segment to the inner surface of the pipe 2) A ceramic segment in the shape of a square/gang that has a through hole penetrating both planes and is formed into a plurality of parts so as to be able to be divided into JET parts. and a through hole that penetrates both planes, and a step or opening that exposes the circumferential side of the through hole on one plane side, or an opening on the circumferential surface and can be divided into multiple parts. A plurality of these two types of ceramic segments are arranged in a row, and a long connecting member is passed through the plurality of ceramic segments arranged in the row. Insert the connected ceramic segment into the pipe while penetrating the hole, and insert the welding pin through the pin hole drilled in the pipe wall on the latter stage or the service part of the holed ceramic segment, and touch the tip of the welding pin to the connecting member surface. In this state, a voltage is applied between the welding pin and the connecting member to weld the welding pin tip and the connecting member, and then the welding pin is fixed to the pipe and integrated, and the long connecting member and welding pin are bonded together. A method for coating and fixing ceramic on the inner surface of a pipe, characterized in that the ceramic segment is fixed to the inner surface of the pipe. 3) A cylindrical ceramic segment is vertically split to form a plurality of segments divided in the longitudinal direction, and the same segment is A through hole that penetrates the inside of the segment in the longitudinal direction and a pin hole drilled from the surface of the segment to the through hole are prepared, and multiple segments are assembled into a cylindrical shape and a long length is inserted into the through hole. A connecting member is inserted into the pipe, and then a welding pin is inserted through a pin fixing hole drilled in the pipe wall above the pin through hole, and the tip of the pin and the connecting member are electrically welded, and then the welding process is performed. A method for coating and fixing ceramic on the inner surface of a pipe is characterized in that a pin is fixed to the pipe and integrated, and a ceramic segment is fixed to the inner surface of the pipe by a long connecting member and a welding pin.

The invention set forth in claim 1 (hereinafter referred to as the first invention) covers the inner surface of a pipe using two types of ceramic segments: a ceramic segment with a stepped portion or an opening, and a ceramic segment with a serving portion. This is a method of fixing it.

On the other hand, the invention stated in claim 2 (hereinafter referred to as 2nd claim)
The invention) is a ring-shaped segment formed by assembling a plurality of parts, and a ceramic segment that can be divided into a plurality of parts and has a useful part, and a ceramic segment that can be divided into a plurality of parts but has a stepped part. This is a method of covering and fixing the inner surface of a pipe using two types of ceramic segments, one without a section.

In addition, the invention described in claim 4 (hereinafter referred to as the third invention) is a cylindrical ceramic segment in which i number of vertically divided segments are assembled into a cylindrical ceramic segment. This method uses shaped ceramic segments to cover and fix the inner surface of the pipe.

(Example) [First example (see Figures 1 to 10)] Ceramic segment without stepped portion (3) of this example (
1), the stepped part (3) and the ceramic segment (2) with a hole are both pressure-molded from alumina into a ring shape using a press, and are relatively small diameter pipes.
).

Further, the connecting member (5) that penetrates the ceramic segment is made of a narrow stainless steel plate. Further, the stepped portion (3) is formed by appropriately reducing the middle and outer diameters on one plane side of the segment.

The welding pin (6) is made of stainless steel and has a threaded portion, and has an electrode grip portion (8) fixed to the rear part of the threaded portion (7) with such strength that it can be broken off by hand.

In this embodiment, first, two stepped or holed ceramic segments (2) are arranged with the stepped portions (3) facing each other, and the connecting member (5) is inserted into the through hole (9). Next, connect two ceramic segments (1) without stepped parts to connect the connecting member (
5). After this, in the same combination, 2 ceramic segments (2) with steps or holes and 1 ceramic segment (1
) Arrange the two pieces alternately and connect them into a long cylindrical shape, and insert this into the pipe (4).

This crest connecting member (5) is exposed to the outside at the serving part (3) at a pitch of four ceramic segments.

Insert the welding pin (6) through the stepped pin hole (10), which has been drilled in advance with a pincher to the thickness of four ceramic segments, in the pipe/magnet (4), and
Press with the electrode holder attached to 8) and apply voltage between the connecting member (5) and welding pin (6) to weld and fix the contact part of the connecting member (5) and welding pin (6). do. After this, the electrode grip portion (8) is broken off and fixed by screwing a nut (ll) onto the screw portion (7). Furthermore, the entire surface of this pin hole (+1) is backfilled with overlay welding.

The ceramic segment is restrained by a connecting member (5) which is connected to the pipe housing (4) by means of a weld pin (6).
), so lateral movement, rotation, falling off, etc. do not occur, and the connecting member (5) is also protected by ceramic segments from high temperature, high humidity, corrosion, etc.

[Second Embodiment (FIGS. 11-18)] The second embodiment shown in FIGS. 11-18 is an embodiment of the second invention according to the aspect described in claim 3.

Ceramic segment without stepped part (3) of this example (
l →, stepped or holed ceramic segment (l) is a relatively large-diameter pipe formed by pressing alumina into a ring shape consisting of two parts... Ceramic segment (1'; 4, stepped) Ceramic Segment △ Me/To (l) and split part (consisting of a female segment (1η) with an inset groove (10) and a male segment (II) with an inset protrusion (formed).

In addition, the through holes (9) are set in each segment (+7) and (1→) so that all the segments are fixed.These are assembled into a ring shape while inserting the connecting member (5) respectively. It is connected in a long cylindrical shape, and then attached to a pipe (14) in the same manner as in the first embodiment.

In this second embodiment, since the ceramic segment is divided into two parts, each part can be formed into a small shape even though it is press-molded using a press, so mold making, pressing work, etc.
It has the advantage of being easy to handle and transport.

[Third Example] The third example shown in FIGS. 19 and 20 is an example of the third invention described in claim 4.

Similar to the second invention, this embodiment is a press-molded product of alumina, which is a cylindrical product cut into quarters, and is relatively long compared to the diameter, so that it can be used regardless of the size of the inner diameter of the pipe housing. It is designed to be applicable.

Through hole (9) and pin through hole 6 (21 is each segment) (2
1), and pin through holes (20) are equally distributed at both ends of each long segment (21).These can be attached in the same manner as in the second invention.

[Fourth Example] The fourth example shown in FIG. 21 is an example of the third invention described in claim 5.

This example is a pipe-shaped ceramic segment by combining the segment of the third example (21) with a through hole (9) and a pin through hole (21), and one with no pin hole (21) formed. The installation procedure for this can be carried out in the same manner as in the second invention.

Although each embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to these embodiments.

For example, regarding the material of the ceramic segment, in addition to alumina used in this example, various ceramics such as silicon nitride, silicon carbide, and zirconia are used depending on the required ceramic performance. In addition to stainless steel, various suitable materials may be used depending on the situation, such as various metals and plastics.

Although the stepped ff1(3) of the stepped or holed ceramic segment is formed with a small outer diameter, the present invention is not limited to this, and may be formed by drilling a hole above the through hole.

Further, the cross-sectional shapes of the through hole (9) and the connecting member (5) can be formed into arbitrary shapes, for example, the cross-sectional shapes as shown in FIGS. 22 and 23 can be made into a crescent shape.

Further, in the second embodiment, the pipe housing is formed into a ring shape by two segments, but the pipe housing is not limited to this, and may be divided into three or four parts according to the diameter of the pipe housing.

Furthermore, the mounting pitch of the welding pins is not limited to that of the embodiment, and only ceramic segments with steps or holes may be used and all segments may be fixed with welding pins.

(Effects of the Invention) As described above, according to the present invention, ceramics are connected using connecting members to form a long cylindrical shape, which is inserted into a pipe and fixed at necessary points by current welding with welding pins. This will produce the following effects.

1. Compared to the adhesive method, ceramic installation can be performed stably without being affected by the temperature and humidity during installation, and is not restricted by the work environment.

2. Also, the pressure bonding process and post-bonding curing period required by the bonding method are no longer necessary, and the heat curing process that requires a superheating furnace is also no longer necessary.

3. Since the welding method was performed using strip materials such as stainless steel, performance can be predicted and managed using various measurement methods that have been widely used in industry, and it is possible to select the appropriate material according to the purpose of use. You can choose widely.

4. Since the ceramic segments are connected and attached using connecting members, there is no risk of one or several ceramic segments falling off and wear progressing from there, rendering the transportation line inoperable.

5. The ceramic part can withstand even when exposed to high temperatures.

6 Regardless of the size of the pipe to be installed, since we use Ceraminok segments manufactured using a pressure molding method using a press, we can create a lining with uniform installation strength using high-performance ceramic, and exhibit excellent performance. I can do it.

7. The construction method according to the present invention does not require the skill level of the worker unlike the conventional construction method, makes it possible to apply ceramic lining to the inner surface of the pipe regardless of its size, and the construction process is simple and the construction period is quick.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the fixing work of the first embodiment, Fig. 2 is a perspective view showing the fixed state of the ceramic segments, Fig. 3 is a cross-sectional view showing the state in which the ceramic segments are connected in a cylindrical shape, and Fig. 4 is an explanatory diagram showing the fixing work of the first embodiment. The figure is a side view showing a ceramic segment without a stepped part, FIG. 5 is a front view of the same, FIG. 6 is a side view of a ceramic segment with steps or holes, FIG. 7 is a front view of the same, and FIG.
The figure is a perspective view of the connecting member, Figure 9 is a front view of the welding pin, Figure 10 is a sectional view of the nut, Figure 11 is an explanatory diagram showing the fixing work of the second embodiment, and Figure 12 is each segment note. 13 is a front view showing a female segment among the ceramic segments without a stepped part, and FIG. 14 is a cross-sectional view showing a female segment of the ceramic segment without a stepped part. 15 is a front view showing a ring-shaped ceramic segment formed by assembling a female segment and a male segment; FIG. 16 is a front view showing a female segment among the stepped or holed ceramic segments;
Fig. 7 is a front view of the same male segment, Fig. 18 is a front view showing a ring-shaped stepped or holed ceramic segment formed by assembling the female segment and the male segment, and Fig. 19 is a front view of each of the third embodiment. A perspective view showing a ceramic segment assembled into a cylindrical shape, FIG. 20 is a sectional view of the same,
FIG. 21 is a sectional view showing a cylindrical ceramic segment of the fourth embodiment, FIG. 22 is a sectional view showing another shape of the through hole, and FIG. 23 is a perspective view showing another shape of the connecting member.
FIG. 24 is a sectional view showing another shape of the divided portion. (1), Ceramic segment (2) Ceramic segment with step or hole (3) 0 step part (4): Hypno-Using (5), Connecting member (6): Welding pin (9) Two through holes
(IQ: Pin hole (12: Ceramic segment (13 two-stage or ceramic segment with hole (14 pipe...Using) (+1: Divided part (10゛ fitting groove (+7): Female segment (1119 fitting protrusion (1') J: Male segment (2,
Pin through hole (21): Segment patent applicant 1) Correct
Masato Masato Toshima
Ministry 4th part q

Claims (1)

[Claims] 1) A ring-shaped ceramic segment with a through hole penetrating both planes, a through hole penetrating both planes, and a stepped portion exposing the through hole on the circumferential surface side. A ring-shaped step or a ceramic segment with a hole is prepared, and a plurality of these two types of ceramic segments are arranged in a row, and the long connecting member is connected to the Penetrates through the through holes of multiple ceramic segments arranged in a row, inserts the continuous ceramic segments into the pipe, and welds through the pin holes drilled in the pipe wall on the latter stage or on the stepped part of the ceramic segments with holes. Insert the pin and bring the tip into contact with the surface of the connecting member. In this state, apply a voltage between the welding pin and the connecting member to weld the welding pin tip and the connecting member, and then fix the welding pin to the pipe. A method for coating and fixing ceramic on the inner surface of a pipe, characterized in that the ceramic segment is fixed to the inner surface of the pipe using a long connecting member and a welding pin. 2) A ring-shaped ceramic segment that has a through hole that penetrates both planes and is divisible into multiple parts;
A through hole that penetrates both planes, and a stepped part or opening that exposes the through hole to the circumferential surface on one plane side, or an opening on the circumferential surface, and is formed so that it can be divided into multiple parts. A ring-shaped step or a ceramic segment with a hole is prepared.
A plurality of these two types of ceramic segments are arranged in a row, a long connecting member is inserted into the through holes of the plurality of ceramic segments arranged in the row, and the connected ceramic segments are inserted into the pipe. Alternatively, insert a welding pin through a pin hole drilled in the pipe wall on the stepped part of the ceramic segment with a hole, touch the tip of the pin to the surface of the connecting member, and in this state apply a voltage between the welding pin and the connecting member. A ceramic pipe characterized in that the tip of the welding pin and the connecting member are welded together, the welding pin is further fixed to the pipe to integrate it, and the ceramic segment is fixed to the inner surface of the pipe by the long connecting member and the welding pin. A method of fixing the coating on the inner surface. 3) A ring-shaped ceramic segment formed in a divisible manner is assembled into a ring shape by fitting a fitting protrusion formed on the other side of the divided part into a fitting groove formed on one of the divided parts. A method of coating and fixing the ceramic described in item 2 on the inner surface of a pipe. 4) A cylindrical ceramic segment is vertically divided to form multiple segments in the longitudinal direction, with a through hole passing through the inside of the segment in the longitudinal direction, and a pin through hole from the surface of the segment to the through hole. Prepare a piece with a hole drilled in it, collect multiple segments to form a cylindrical shape, insert a long connecting member into the through hole and insert it into the pipe, and then drill a hole in the pipe wall above the pin hole. A welding pin is inserted through the pin fixing hole, and the tip of the pin and the connecting member are electrically welded.The welding pin is then fixed to the pipe and integrated, and the ceramic segment is attached to the pipe using the long connecting member and the welding pin. A method of coating and fixing ceramic on the inner surface of a pipe, characterized by fixing it on the inner surface. 5) A method for coating and fixing the ceramic on the inner surface of a pipe as set forth in claim 4, wherein a cylindrical ceramic segment is composed of a segment in which a through hole and a pin hole are formed and a segment in which a through hole is not formed.