JPH08332569A - Support device of torch for build up welding - Google Patents

Abstract

PURPOSE: To always make rotation of a cylindrical member and movement of a support cylinder in the axial direction smooth and to simplify the construction. CONSTITUTION: A ball holder 26 is arranged on the outer peripheral face of a support cylinder 24 arranged with a torch at its tip. Two support holes 27 are formed apart in a prescribed interval on its peripheral direction. Ceramic balls 28 made of ceramic are loose-fitted to each support hole rollable. The ceramic balls loose-fitted into the support holes 27 are protruted outward from the hole 27 by a required quantity. Further, under the state the protruded parts of ceramic balls 28 protruding outward from the support holes 27 are abutted on the inner peripheral face of cylindrical member 10, the support cylinder 24 is supported by no contact and movable in the cylindrical member 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support device for build-up welding torches, and more specifically, a torch for applying build-up welding to the inner peripheral surface of a long tubular member such as a steel pipe. The present invention relates to a build-up welding torch support device that supports a torches in a tubular member in a state where the members can be smoothly rotated and axially moved.

[0002]

2. Description of the Related Art A method of plasma overlay welding of various coating metal materials on the inner peripheral surface of a long tubular member such as a steel pipe, which requires properties such as high wear resistance, rust prevention and corrosion resistance. Coating is carried out. FIG. 6 shows a schematic configuration of a welding device for overlay welding a coating metal material on the inner peripheral surface of the tubular member 10. The outer cylinder 12 fixed to the base 11 has an axial direction inside thereof. Inner cylinder 14 that can move back and forth freely
Inner tube 14 that is inserted through and projects from the open end of the outer tube 12.
A torch 16 for overlay welding is arranged at the tip of the. Each torch 16 has a tubular body piped inside the inner cylinder 14.
Metal powder for coating, plasma gas, carrier gas, etc. are supplied through (not shown). At the time of overlay welding by this device, the inner cylinder 14 and the outer cylinder 12 are inserted into the inside of a cylindrical member 10 rotatably held by a holding member (not shown), and a torch is provided at the tip of the inner cylinder 14. The 16 ejection ports are opposed to the inner surface of the tubular member 10 by a required distance. In this state, the metal powder is fed into the plasma arc ejected from the ejection port of the torch 16, and the metal powder melted by the high heat of the plasma arc is built up on the inner peripheral surface of the tubular member 10. Then, while the tubular member 10 is moved in the axial direction while being rotated, the inner cylinder 14 is reciprocated at a high speed in the axial direction (weaving) with respect to the outer cylinder 12, so that the inner peripheral surface of the tubular member 10 is A wide bead is built up in layers in the longitudinal direction.

A bracket 18 is attached to the open end of the outer cylinder 12.
Is provided on the bracket 18, as shown in FIG.
A plurality of first rollers 20 that are in contact with the inner peripheral surface of the tubular member 10 and are rotatable in the rotational direction of the tubular member 10 are pivotally supported at a required interval in the circumferential direction. Further, a plurality of second rollers 22 that are in contact with the outer peripheral surface of the inner cylinder 14 and are rotatable in the axial direction of the inner cylinder 14 are pivotally supported by the bracket 18 at predetermined intervals in the circumferential direction. That is, the outer cylinder 12 is supported by the first roller 20 with respect to the tubular member 10, and the tubular member 10 is supported.
The inner cylinder 14 is supported by the second roller 22 with respect to the outer cylinder 12, and the weaving of the inner cylinder 14 in the axial direction is smoothly performed.

[0004]

In the above-described welding apparatus, since the inside of the tubular member 10 in the state where overlay welding is being carried out has an extremely high temperature (about 300 degrees), the first roller 20 and The second roller 22 is made of a metal material having excellent heat resistance. However, both rollers 2
0 and 22 are exposed to a high temperature for a long period of time, and unmelted metal powder ejected from the torch 16 is caught in the pivotal part thereof to cause seizure and the like, which often prevents smooth rotation. The service life was short. Therefore, the rollers 20 and 22 need to be replaced in a short period of time, which increases the running cost and causes a decrease in work efficiency due to a loss time at the time of replacement. Also, torch 1
While inserting the inner cylinder 14 in which 6 is arranged into the outer cylinder 12,
Since the rollers 20 and 22 for supporting the inner cylinder 14 and the tubular member 10 are arranged in the outer cylinder 12, the structure becomes complicated, and the outer diameter of the arrangement position of both rollers 20 and 22 becomes large. However, there is also a drawback that the inner diameter of the tubular member 10 capable of overlay welding is limited.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks inherent in the prior art, and is proposed in order to solve this problem. An object of the present invention is to provide a support device for a build-up welding torch having a simple structure that can be always smoothly performed.

[0006]

SUMMARY OF THE INVENTION In order to overcome the above problems and preferably achieve the intended purpose, the present invention provides a torch for overlay welding on the inner peripheral surface of a tubular member. A support device for movably supporting an inner peripheral surface, wherein the torch is provided at a tip, and the support cylinder is insertable into the inside of the tubular member in a non-contact manner, and in a circumferential direction of the support cylinder. A plurality of balls made of a ceramic material, which are rotatably arranged at positions spaced apart from each other by a required distance in a state of partially protruding outward in the radial direction, and the protruding portions of which are in contact with the inner peripheral surface of the cylindrical member. And inserting the torch and the support tube into the inside of the tubular member in a state where the balls are in contact with the inner peripheral surface of the tubular member, and the rotation of the ball and the support tube by the rolling of the balls. It is characterized in that it is configured to smoothly move.

In order to achieve the above object, another invention of the present application is a supporting device for movably supporting a torch for overlay welding on an inner peripheral surface of a tubular member, with respect to the inner peripheral surface of the tubular member. The torch is provided at the tip and can be inserted in the tubular member in a non-contact manner inside the tubular member, a holder provided on the outer peripheral surface of the support tube, and the holder and its circumference. Direction, a plurality of support holes formed at a required distance apart from each other, and the support holes are rotatably loosely fitted in a state in which a part of each of the support holes is projected outward, and the projecting portion is inside the tubular member. A ball made of a ceramic material that abuts on the peripheral surface, and the torch and the support cylinder are inserted into the cylindrical member while the balls are in contact with the inner peripheral surface of the cylindrical member, and the ball rolls. Is configured so that the tubular member can be smoothly rotated and the support tube can be moved smoothly. .

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a support device for a build-up welding torch according to the present invention will be described with reference to the accompanying drawings with reference to preferred embodiments. The same members as the members described in the section of the related art with reference to FIGS. 6 and 7 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a side view showing an overall structure of a support device for a build-up welding torch according to an embodiment. For example, a plasma is attached to the tip of a support cylinder 24 movably supported by a moving means (not shown). A torch 16 for overlay welding is arranged, and the torch 16 is supplied with necessary metal powder, required gas, and the like through each tubular body (not shown) provided inside the support cylinder 24. It is supposed to be done.

On the outer peripheral surface of the support cylinder 24 near the tip of the torch 16, a ball holder 26 is provided below the ejection port of the torch 16.
6, a plurality of them are arranged at required intervals in the circumferential direction (for example, at intervals of 60 degrees around the axis of the support tube 24) as shown in FIG.
Support holes 27 (two in the embodiment) are formed. And
A ball 28 made of ceramics is provided in each support hole 27.
(Hereinafter referred to as "ceramic ball") is loosely fitted so that it can be rolled. As shown in FIG. 3, the ball holder 26 includes a spacer 30 that abuts the outer peripheral surface of the support cylinder 24,
It is composed of a supporting plate 32 facing the outside of the spacer 30 and a pressing member 34 facing the outside of the supporting plate 32. The pressing member 34, the supporting plate 32 and the spacer 30 are connected to the plurality of screws 3.
It is configured to be fixed to the support cylinder 24 by 6.

The support holes 27 formed in the ball holder 26 are formed in the longitudinal direction of the support plate 32 as shown in FIG.
It is composed of an elongated hole 32a formed to extend a required length in the (axial direction of the support cylinder 24) and an elongated hole 34a formed to extend a required length in the longitudinal direction of the pressing member 34. . The inner diameter of the oblong hole 32a in the support plate 32 in the lateral direction is set to be slightly larger than the diameter of the ceramic ball 28 so as to allow the smooth movement of the ball 28 in the longitudinal direction. In addition, the long hole 34 of the pressing member 34
The inner diameter in the lateral direction of the outer end of a is the ceramic ball 2
8 is set to be sufficiently smaller than the diameter of 8, and the opposing inner ends are formed in an arc shape following the outer peripheral surface of the ceramic ball 28, and the ceramic ball 28 loosely fitted in both elongated holes 32a and 34a (support hole 27) is formed. It is configured to be able to roll smoothly while protruding outward by a required amount. A projecting portion of the ceramic ball 28 that projects outward from the support hole 27 is brought into contact with the inner peripheral surface of the tubular member 10 so that the support tube 24 is movably supported in the tubular member 10 without contact. (See FIG. 3).

The support plate 3 of the spacer 30 is used.
The long groove 30 having the same length at the position corresponding to each long hole 32a of 2
a is formed so that the movement of the ceramic ball 28 in the support hole 27 can be smoothly guided. Further, the spacer 30 is configured to be detachable and replaceable, and the distance from the outer peripheral surface of the support cylinder 24 to the protruding portion of the ceramic ball 28 can be changed by replacing the spacer 30 with a spacer 30 having a different thickness. Thereby, the separation distance from the ejection port of the torch 16 to the inner peripheral surface of the tubular member 10 can be adjusted, and overlay welding can be always performed under optimum conditions.

That is, the support cylinder 24 provided with the ball holder 26 is disposed inside the cylindrical member 10 during overlay welding.
Two ceramic balls 28 loosely fitted in the holder 26,
28 is inserted while being in contact with the inner peripheral surface of the tubular member 10. Then, while supplying the molten metal ejected from the torch 16 arranged in the support cylinder 24 to the inner surface of the tubular member 10,
The tubular member 10 is moved in the axial direction while being rotated by a rotating means (not shown), and the support tube 24 is moved to the tubular member 10.
On the other hand, by weaving in the axial direction, a bead having a wide width in the longitudinal direction is built up in layers on the inner peripheral surface of the tubular member 10. At this time, the ceramic balls 28,2
8 rolls in the support holes 27, 27 of the ball holder 26,
The tubular member 10 can be smoothly rotated with respect to the support tube 24, and the axial movement of the support tube 24 with respect to the tubular member 10 can be smoothly performed. The support hole 27 formed in the ball holder 26 is an elongated hole (32a, 34a) extending in the required direction in the moving direction of the support cylinder 24.
Since the ceramic balls 28 can move along the longitudinal direction of the support holes 27, smooth movement can be achieved even when the speed is higher than the axial movement of the support cylinder 24.

The ceramics used as the material of the ceramic balls 28 are, for example, carbides, oxides, nitrides,
A silicide or the like can be adopted. This ceramic has extremely high wear resistance as compared with conventional metal materials, and has heat resistance that does not deteriorate even when exposed to high temperatures for a long period of time. Therefore, when the above-mentioned build-up welding is performed, the ceramic balls 28 always roll smoothly in the support holes 27 of the ball holder 26, the rotation of the tubular member 10 with respect to the support tube 24 and the axis of the support tube 24. It is possible to smoothly move in the direction for a long period of time. Moreover, in the case of ceramics, seizure does not occur even if the metal powder or the like ejected from the torch 16 is caught.

Here, as a result of actual overlay welding using the supporting device according to the prior art (provided with the first roller 20 and the second roller 22) and the supporting device according to the embodiment, In the conventional supporting device, the rollers 20 and 22 did not rotate smoothly in 100 hours due to seizure due to the inclusion of metal powder. On the other hand, in the supporting device of the example, the ceramic balls 28 were smoothly rotated without seizing even after 300 hours had passed. That is, in the supporting device using the ceramic balls 28, it was found that the balls 28 continued to rotate smoothly semipermanently and no replacement was necessary.

[0016]

[Modification] FIG. 5 shows a modification of the ball holder 26 in the supporting device, in which a circular support hole 27 is formed in the holder 26. That is, a plurality of round holes 32b (two in the illustrated example) are formed in the support plate 32 at the required angular intervals in the circumferential direction, the round holes 32b having an inner diameter set slightly larger than the diameter of the ceramic ball 28. In addition, at the position corresponding to the round hole 32b of the support plate 32 in the pressing member 34, the inner diameter of the outer end is smaller than the diameter of the ceramic ball 28, and the inner peripheral surface is formed into an arc shape that follows the outer peripheral surface of the ceramic ball 28. The hole 34b is formed. Then, the ceramic ball 28 is rotatably loosely fitted in the support hole 27 formed of both round holes 32b and 34b, and the ball 28 is projected from the round hole 34b of the pressing member 34 by a required amount. There is. Also in this modified example, the ceramic balls 28 contacting the inner peripheral surface of the tubular member 10 always roll smoothly, and the rotation of the tubular member 10 and the support tube 2 are performed.
The axial movement of 4 can be smoothly maintained for a long period of time.

In the above-described embodiment, the case where the ball holder 26 is composed of the three members 30, 32 and 34 has been described, but the present application is not limited to this, and for example, the support plate 32 and the pressing member 34. It is also possible to integrally form and, and to form a long hole or a round hole in which the ceramic ball 28 can roll in a state of protruding by a required amount. The number of ceramic balls 28 provided is not limited to two as in the embodiment, and may be three or more. Further, a plurality of ball boulders 2 in which one ceramic ball 28 is loosely fitted
6 may be arranged in the circumferential direction of the support cylinder 24 with a required space therebetween, or a plurality of ball holders 26 may be arranged at predetermined intervals in the axial direction of the support cylinder 24.

[0018]

As described above, according to the support device for a build-up welding torch according to the present invention, the balls made of a ceramic material arranged on the outer periphery of the support cylinder having the torch at the tip are extremely high. It has abrasion resistance and heat resistance. Therefore, it is possible to smoothly rotate the tubular member and axially move the support barrel for a long period of time, and it is possible to keep the running cost low. Further, since the inner cylinder is not inserted into the outer cylinder as in the conventional case, the structure is simplified and the manufacturing cost can be reduced. Moreover, since the support portion of the torch can have a small diameter, it is possible to perform overlay welding on a tubular member having a smaller diameter than before.

[Brief description of drawings]

FIG. 1 is a side view showing an overall structure of a support device for a build-up welding torch according to an embodiment of the present invention.

FIG. 2 is a front view showing an arrangement portion of a ball holder in the supporting device of the embodiment.

FIG. 3 is a vertical cross-sectional view showing an arrangement portion of a ball holder in the supporting device of the embodiment.

FIG. 4 is a vertical cross-sectional view showing an arrangement portion of a ball holder in the supporting device of the embodiment.

FIG. 5 is a front view showing a modified example of the ball holder in the supporting device of the embodiment.

FIG. 6 is a side view showing an overall structure of a support device for a overlay welding torch according to a conventional technique.

FIG. 7 is a cross-sectional view of a main part of a supporting device according to a conventional technique.

[Explanation of symbols]

 10 Cylindrical member 16 Torch 24 Supporting cylinder 26 Ball holder 27 Supporting hole 28 Ceramic ball

Claims (3)

[Claims] 1. A support device for movably supporting a torch (16) for overlay welding on the inner peripheral surface of a tubular member (10) with respect to the inner peripheral surface of the tubular member (10). The torch (16) is provided at the tip, and the support tube (24) that can be inserted into the tubular member (10) without contact is separated from the support tube (24) in the circumferential direction by a required distance. A plurality of balls made of a ceramic material, which are rotatably arranged in a state of partially protruding outward in the radial direction, and the protruding portions of which are in contact with the inner peripheral surface of the cylindrical member (10). (28), the torch (16) and the support tube (24) inside the tubular member (10) in a state in which the balls (28) are in contact with the inner peripheral surface of the tubular member (10). A support device for build-up welding torch, characterized in that it is configured to smoothly rotate the tubular member (10) and move the support tube (24) by inserting the ball into the ball and rolling the ball (28). 2. A support device for movably supporting a torch (16) for overlay welding on the inner peripheral surface of a tubular member (10) with respect to the inner peripheral surface of the tubular member (10). The torch (16) is provided at the tip, and the support tube (24) is inserted into the tubular member (10) in a non-contact manner, and is provided on the outer peripheral surface of the support tube (24). Holder (26), a plurality of support holes (27) formed in the holder (26) with a required spacing in the circumferential direction, and a part of the support holes (27) protruding outward. The ball (28) is made of a ceramic material and is fitted into the cylindrical member (10) such that the ball is in a tubular shape. The torch (16) and the support cylinder (24) are inserted into the cylindrical member (10) in a state of being in contact with the inner peripheral surface of the member (10), and the cylindrical member is formed by rolling the ball (28). Make sure to smoothly rotate (10) and move the support tube (24). Support device overlay welding torch, characterized in that it has. 3. The support device for a build-up welding torch according to claim 2, wherein the support hole (27) is an elongated hole extending in the axial direction of the support cylinder (24) by a required length.