KR850001848B1 - Device for feeding with elongate lining material aninstallation for lining a tubular member - Google Patents

Abstract

A device for feeding elongated lining material(4) into a tubular member(1) has a dia. of 650-1000mm and is mounted for rotation about its axis. A horizontal arm(6) is mounted for vertical and horizontal translatory motion and one end, which also carries a welding head(2), is introduced into the tubular workpiece. The arm moves the lining material into contact with the tube wall. Additional lining material is provided from a reel(20) rotatably mounted on the arm. This allows the lining material e.g. in ribbon form, to be progressively delivered and welded in place as the tube rotates. This method can be used, e.g., 50 line mild steel pipes with stainless steel.

Description

A device for supplying a long coating material to a device for covering the inner surface of a pipe.

1 is an axial elevation view of a tube showing the feeder and weld head of the present invention;

2 is a plan view of the line A-A of FIG.

The present invention relates to an apparatus for supplying a long coating material to an apparatus for coating an inner surface of a tube having a diameter of 650 to 1,000 mm.

For example, a conventional coating apparatus configured to cover a tubular body by using a ribbon-shaped long lining material has a welding head inserted into the tubular body, which is provided on an arm capable of moving the welding head in the axial direction. It is supported by. In addition, while the tube is rotating, the coating is applied by a continuous pass, and the coating material is continuously supplied to the welding head in one pass in which a coating ring is formed on the inner surface of the tube.

In particular, in the field of nuclear reactors, it is necessary to cover the inner surface of a pipe or a pipe used for conveying a high temperature high pressure fluid or a corrosive fluid such as pressurized water in a cooling circuit of a pressurized water reactor.

To manufacture such a tube, a low alloy steel tube element coated with an inner surface of stainless steel is used to be resistant to corrosion by high temperature, high pressure water or other corrosive fluids.

In the case of manufacturing such a tubular element, the coating device as described above is used, and the welding head of the coating device is continuously supplied with a ribbon material made of stainless steel, that is, a strip.

Tubing used in the nuclear industry, which needs to form a sheath of stainless steel, is generally less than 1 m in diameter, which is a problem associated with installing the welding head used and the ribbon-type cladding material supply associated therewith. This exists.

In practice, in the case of a pipe having a very large diameter, a reel in which a ribbon-like coating material is wound can be disposed above the welding head, so that the coating material enters the welding head vertically, It can be guided and driven in a vertical direction up to a welding zone located in the withdrawal of the tube to be coated which is rotated about the axis.

On the other hand, when the diameter is less than 1 m, the rail wound with the covering material cannot be disposed above the welding head. Therefore, in this case, the rail is provided on the arm portion located outside the pipe during the welding operation. The coating material is moved from work along the horizontal arm or to the place where the welding nozzle is located parallel to the arm.

In addition, movement of the coating material over the entire length or over most of the arm is intended to be guided by the rollers, but this roller may cause deformation or breakage of the long coating material during such guidance.

When the coating material is broken in this way, the welding operation must be stopped in order to recombine the long coating material to the welding head, and this interruption makes it impossible to achieve the welding operation at high speed.

In addition, when the long coating material is deformed, the dimensions, shape or metallurgical characteristics of the coating material may be changed. In such a case, it is necessary to perform auxiliary work such as polishing or cutting after coating.

Accordingly, an object of the present invention is to provide a coating apparatus for covering an inner surface of a tubular body which is disposed on a support with the axis horizontal and is rotatable about the axis by the support and has a diameter of 650 to 1,000 mm. A feeding device for supplying a coating material, the support having a horizontal arm capable of translating in the vertical and horizontal directions is provided, and the end of the horizontal arm inserted into the tube during the coating operation guides the long coating material. An upright welding head provided with a drive device is provided, and the movement path of the coating material in the welding head until the tubular body comes into contact with the inner surface so as to be welded to the inner surface of the lower part of the tube when the tubular body rotates about its own horizontal axis. Is maintained in the vertical direction to prevent deformation and breakage of the coating material and at the same time Space to provide a small supply.

For this purpose, in the feeder of the present invention, the rail on which the long coating material is wound is mounted on the side of the welding head close to the front end of the welding head, that is, on the pipe end opposite to the side on which the welding head is inserted, It is rotatably installed on an axis integral with the front end of the arm, has a slight angle with the horizontal arm, and has an end in a vertical path for introducing a long coating material into the guide and drive unit combined with the welding head. An adjustable guide is provided for guiding the coating material from the lower region of the rail to the top of the weld head along a path that is adapted for the width and flexibility of the tool.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, inside the tubular body 1, a stainless steel ribbon-like material, i.e., a strip 4, is brought into contact with the inner surface 3 of the tubular body 1, so that the inner surface 3 The welding head 2 for welding and fixing to is arrange | positioned.

Further, as shown in FIGS. 1 and 2, the welding head 2 is mounted to the support member 7 by screws 11, 12, and the support member 7 is mounted on the arm 6. It is supported by the two sliding support members 9 and 10 at the front-end | tip.

The slide-shaped arm 6 is mounted on a support (not shown) composed of one bracket so as to be capable of vertical movement in the vertical direction and its own axial direction, and the support of the arm 6 It is configured to generate a long vertical motion and a horizontal motion in the direction of the arm axis 14 which is successively stepped at an amplitude substantially equal to the width of the strip 4.

The front part of the support member 7, that is, the part of the support member 7 that is directed toward the opposite end of the pipe body on the end side for entering the welding head 2 into the pipe body 1, consists of a end plate 16, which is the end plate. (16) is fixed to the tip of the support member (7) by means of screws (17), and the direction of the end plate (16) relative to the arm (6) along the support member (7) is adjusted by the screws (17). Thus, the axial direction of the shaft 18 fixed to the end plate 16 of the supporting member 7 is adjusted.

The shaft 18 is fixed on the support member 7 by a nut 19 to support the rail 20 on which the strip 4 is wound.

Therefore, when the direction of direction of the end plate 16 relative to the support member 7 and the arm 6 is adjusted, the direction of direction of the rail 20 relative to the arm 6 is adjusted.

This direction adjustment is in effect rotating the axis 18 of the rail 20 about the axis 14 of the arm 6. The axis 18 will have some small angle with respect to the axis 14 of the arm 6 in all its positions.

By adjusting the directing direction of the plate 16, it is possible to change the inclination of the rail surface relative to the horizontal plane and the vertical plane passing through the axis 14 of the arm 6, which is generally 90 °. Do not.

On the other hand, the position of the welding head 2 and the rail 20 with respect to the arm 6 can be adjusted by the sliding support members 9 and 10. By means of the sliding support member 9 the position of the welding head 2 relative to the arm 6 can be adjusted in the transverse direction, ie in the horizontal direction perpendicular to the axis of the arm 6, such adjustment being a screw. The electric motor 23 which drives the 24 is implemented. The screw 24 is coupled to the support member 25 which is integral with the fixed plate 26 of the support member 7.

Similarly, the sliding support member 10 provided with the two guide rods 28 and 29 is comprised so that a vertical translation may be performed by the screw 27 driven by an electric motor.

Therefore, the horizontal position and the vertical position of the welding head 2 and the rail 20 are controlled extremely precisely inside the tubular body 1 from the control station of the coating apparatus.

The welding head 2 is provided with a conductive end member 30 which ensures electrical contact with the strip 4 when the strip 4 is applied and welded to the inner surface 3 of the tubular body 1. The welding head 2 is also provided with two cups 31 for distributing the welding flux to the welding zone where the end material 30, which is the current supply site, is located.

The cup 31 is supplied with compressed air by the compressed air from a flux reservoir disposed at an end of the arm opposite to the end side supporting the welding head 2 inserted into the tube 1. Mainly, the welding flux composed of silicate particles is supplied to the cup 31 through the supply pipe by compressed air.

Guide passages of the two pairs of drive rollers 33, 34 and strip 4 which remain engaged with the strip 4 while the strip 4 moves vertically from the weld head 2 32 is provided in the welding head 2. The guide and drive device, that is, drive rollers 33 and 34 are connected to the reduction device, thereby moving the strip 4 inside the welding head 2 while rotating.

The welding head 2 has a deflection roller 35 at the top where the strip 4 reaches, whereby the strip 4 is guided into the interior of the welding head 2.

The feeding device for supplying the strip 4 to the welding head 2 is provided with three sets of guide rollers 36, 37, 38 on the outer shaft of the rail 20 rotatably mounted on the shaft 18. This guide roller is mounted on the support body integral with the welding head 2 and the support member 17 of the rail 20 by the shafts 39, 40, 41, so that The guide rollers 36, 37, 38 for the shafts 39, 40, and 41, respectively, can be adjusted according to the elasticity, shape, and dimensional characteristics of the strip 4, respectively. It is.

The strip 4 passes between the roller spacings of the guide rollers 36, 37, 38 of each set.

The rail 20 is provided with two arms 20a, 20b, and (refer to FIG. 2) provided at intervals of 90 degrees integrally with the bearing 43 provided on the shaft 18. As shown in FIG. Each arm 20a, 20b of the rail 20 has a support mechanism of the strip 4, which supports both ends of the shaft 46 for adjusting the support mechanism according to the width of the strip 4. Equipped with.

In this way, the roll of the strip 4 is supported on the rail 20 and the strip 4 is not released until the end of the strip is pulled by the drive rollers 33 and 34, and the strip is not released. Only after the end is pulled does the rail begin to rotate.

The strip 4 has three sets of guide rollers 36, 37, () from the bottom 50 of the rail 20 until it reaches the deflection roller 35 which forms the top of the welding head 2. 38).

The guide is positioned to release the strip 4 from the bottom 50 of the rail 20. As shown in FIGS. 1 and 2, the strip 4 forms a loop shape, the lower part of which extends tangentially to the lower part of the rail 20, and the upper part of the loop. Extends tangentially with respect to the vertical plane passing through the axis 14 of the arm 6.

By the direction of the rail 20 by adjusting the position of the shaft 18 and by the adjustment of the guide rollers 36, 37, 38, the rails 20 and The shape of the loop formed by the strip 4 between the welding heads 2 can be adjusted.

As can be seen with reference to FIG. 1, the cross-sectional dimension of the overall device consisting of the welding head 2 and the rail 20 is such that the arrangement of the device 20 is arranged to place the rail 20 on top of the welding head 2. It is very small compared to the cross-sectional dimensions.

During the welding operation of the strip 4 forming the inner surface sheath of the tube 1, the tube 1, which is arranged on the drive rollers 52, 53 with the axis horizontal, has a welding speed on the inner surface 3. It will rotate about its own axis at a low speed corresponding to.

At the same time as the tubular body 1 is rotated, the drive rollers 33, 34 arranged in the welding head 2 are driven, so that the strip 4 is applied to the inner surface 3 of the tubular body 1. It is released at a linear velocity that enables. As a result, the strip 4 is welded to the inner surface 3 of the tubular body 1 while passing through the end member 30 positioned at the current supply site.

This welding takes place inside the conductive solid flux supplied to the welding zone by the cup 31.

When the tubular body 1 rotates once, the rotation of the tubular body 1, the drive of the driving rollers 33 and 34, and the supply of the strip 4 to the welding zone are simultaneously stopped.

Next, the arm 6 is horizontally moved toward the area of the tube body 1 which is not yet covered, and the rotation of the tube body 1 by the drive rollers 52 and 53 and the drive rollers 33 and 34 are performed. The movement of the strip 4 by means of a new one is to start the next pass. In this case, the horizontal movement of the arm 6 is made with an amplitude slightly smaller than the width of the strip 4 so that the films formed in each successive pass can overlap each other slightly.

For example, in the case where a stainless steel strip having a width of 60 mm is coated on a pipe of a reactor pipe having a diameter of 660 mm, the overlapping film width is 8 mm.

At the start of the coating operation, the height of the arm 6 on the support is roughly adjusted, and then the arm 6 is directed toward the coating device and the arm of the shaft supporting the welding head 2 inside the tubular body 1. Enter the tip of (60).

Subsequently, accurate positioning in the height direction of the welding head 2 is performed by the sliding support member 10 and accurate positioning in the lateral direction by the supporting member 9, respectively.

The main advantages of the feeder according to the invention are the fact that the feeder and weld head with respect to the axis of the pipe are small in the transverse dimension, and that it is possible to introduce this into the weldhead so that the strip does not deform and break. For example, the loop forming the passage between the rail and the weld head may guide the strip to have a sufficiently large radius of curvature depending on the strip's formation, dimensions and mechanical properties.

The present invention is not limited to the above embodiments, and many modifications can be made. In one example, the position adjusting device of the rail, the fixing device and the guide device of the strip may be different from the specific configuration described above.

Not only the welding head of the above-mentioned aspect of the present invention, but also the welding head having various forms can be applied depending on the current supply and the form of welding to be realized.

In addition, the present invention is applicable not only to welding of strips, but also to welding wire rods or other long flexible materials supplied along a looped path from a winding surface to a position in a perpendicular direction.

The present invention can also be used to coat the inner surface of all piping used in other industries, as well as to cover the inner surface of piping used in the nuclear industry.

Claims (1)

A supply apparatus for supplying an elongated coating material (4) to an apparatus for covering an inner surface of a tubular body (1) having a diameter of 650 to 1000 mm and being rotatable about the axis, being arranged on a support with its own axis horizontally, A horizontal arm 6 capable of translating in the vertical and horizontal directions is provided on the support, and one end of the horizontal arm is inserted into the tube during the coating operation, and the vertical arm and the vertical weld are welded in the tube. The path of the coating material in the welding head 12 supports the head 2, and the welding head 2 has guides and drives 33, 34 for the coating material. Configured to maintain the vertical direction until the inner surface and the covering material come into contact so that the covering material is welded to the lower inner surface of the tube when 1) rotates about its horizontal axis, and the covering material is In the coating material supply device configured to be wound around a rail 20 located in front of the welding head 2 rotatably supported on an axis fixed to the tip of the flat arm 6, the shaft of the rail 20 ( 18 has a predetermined small angle of inclination α with respect to the horizontal arm 6, and from the lower region of the rail 20 located on the horizontal arm axis to the top of the welding head 2, Applying the coating material to the top of the weld head along a looped path adapted to its width and flexibility, and then along a vertical path for guiding the coating material into guides and drives 33,34 coupled to the weld head. An adjustable guide for guiding, the horizontal arm 6 comprises a end plate 16 which firmly mounts the rail 20, the rail 20 with respect to the welding head 2; To adjust the direction of the rail 20 Teeth and the horizontal arm 6 supports the rail 20 by sliding members 9 and 10 for changing the vertical position and the horizontal position at the tip thereof. Characterized in that it is strip-shaped and the adjustable guide consists of a plurality of rollers 36, 37 and 38 and the elongated coating material is supported and guided along the looped path through the rollers 36, 37 and 38. Apparatus for supplying a long coating material to a device for coating the inner surface of the tube.

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