JP2023039481A - Pipeline brazing device - Google Patents

Abstract

To make it possible to easily and safely braze a component to be joined to an end of a pipeline with uniform quality.SOLUTION: A pipeline brazing device has: pipeline fixing and supporting means 13 which fixes and supports a pipeline 1 of which an end is inserted in a connection joint 2 via ring wax 3; connection joint holding means 14 which holds the connection joint in the state of energizing the same to the pipeline side, is movable in an axial direction, and is rotatable around an axis; heating means 16 which is located near the connection joint held by the connection joint holding means, heats the connection joint, and melts the ring wax; rotating means 18 which rotates in a reciprocate manner the connection joint holding means at a prescribed angle during heating of the connection joint by the heating means, and rotates the connection joint around the axis; a contact type displacement sensor 19 which detects, by movement of the connection joint holding means, that the connection joint has displaced to the pipeline side by melting of the ring wax; and a control unit 12 which so controls as to operate the heating means and the rotating means until it is detected by the contact type displacement sensor that the ring wax has been molten and the connection joint has displaced to the pipeline side by a specified value.SELECTED DRAWING: Figure 6

Description

Embodiments of the present invention relate to pipe brazing apparatus.

In the construction of gas circuit breakers (GCB) and gas insulated switchgear (GIS) that use highly insulating sulfur hexafluoride (SF6) gas, the units are connected by gas pipes, and individual parts assembled on site are installed. The equipment is filled with sulfur hexafluoride gas. The gas pipes used for connection are generally small-diameter copper pipes that have stable weather resistance and ensured durability. connected by attaching

In general, brazing work, especially high-temperature brazing work, can be broadly classified into one method of using a brazing material such as SP-27, which is called "brazing brazing", together with flux. In this method, the flux carbonizes at a high temperature, and the flux unevenly overflows outside the brazing surface, impairing the appearance, and the residual flux may cause corrosion. Moreover, it takes time to remove the residual flux.

Another method is a brazing method that uses a brazing material such as phosphorous copper solder (BCuP-5, etc.) having a self-flushing action and does not use flux. Since flux is not used, a process for removing carbonized flux and residual flux can be omitted, but an oxide film is generated inside the brazed parts. In order to prevent this oxide film, an inert gas is flowed inside the brazed parts.

JP-A-59-150658 JP-A-2002-263879 JP 2016-155137 A JP 2019-202338 A

However, the inert gas inflow device is generally designed to enclose the entire brazed part, resulting in a large size. Moreover, since the gas inflow device itself is installed as an independent device, the operations of fixing the brazed parts, heating, and injecting the inert gas are separate operations, resulting in inefficient work at the site. .

In addition, in a high-temperature brazing operation, the heated and melted brazing material does not flow evenly, and there is a problem that blowholes are generated in the brazed portion. In order to deal with this problem, it is possible to rotate the pipe or the connection joint as the member to be joined, but the rotating work under high temperature heating poses problems in terms of safety and workability.

Furthermore, the high-temperature brazing work using phosphorous copper brazing is highly difficult, and only those who have passed the certification test are permitted to perform the work, having undergone training using special tools. However, even those who have passed the certification test have different levels of workers. For example, a worker who always performs brazing work and a worker who does brazing work for the first time in a long time have a significantly different finished state of brazing work.

SUMMARY OF THE INVENTION The embodiments of the present invention have been made in consideration of the above-mentioned circumstances, and provide a pipe brazing apparatus capable of easily and safely brazing a member to be joined to the end of a pipe with uniform quality. aim.

A pipe brazing apparatus according to an embodiment of the present invention includes pipe fixing and supporting means for fixing and supporting a pipe whose end is inserted into a member to be joined via a brazing material, and urging the member to be joined toward the pipe. a member-to-be-joined holding means that holds the joined member in the folded state and is provided to be axially movable and rotatable around the axis; heating means for heating the members to be joined to melt the brazing material; rotating means for reciprocally rotating the member to be joined by a predetermined angle to rotate the member to be joined around an axis; and the heating means and the rotating means are operated until the displacement detecting means detects that the brazing material melts and the member to be joined is displaced toward the pipe side by a predetermined amount. and a control means for controlling to cause the

According to the embodiments of the present invention, it is possible to easily and safely braze a member to be joined to an end portion of a pipe with uniform quality.

1 is a block diagram showing the configuration of a pipe brazing apparatus according to one embodiment; FIG. The front view which shows the brazing apparatus main body of FIG. FIG. 3 is a plan view showing the brazing apparatus main body of FIG. 2; IV-IV arrow directional view of FIG. VV arrow directional view of FIG. FIG. 3 is an enlarged front half-sectional view of the main part of FIG. 2 ; VII arrow line view of FIG. The VIII arrow view of FIG. Fig. 7 is a half-sectional view showing the piping, connection joint and ring brazing of Fig. 6, where (A) shows the state before brazing and (B) shows the state after brazing. FIG. 6 shows the operation of the contact-type displacement sensor, where (A) shows the state before installation of pipes, (B) shows the state after installation of pipes, and (C) shows the operation after melting the ring brazing. figure. FIG. 10 shows the action when a laser distance sensor is used instead of the contact displacement sensor, where (A) shows the state before installation of pipes, (B) shows the state after installation of pipes, and (C). FIG. 4 is an operation diagram showing a state after the ring brazing is melted; 2 is a flow chart showing the operation of the control device of FIG. 1;

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated based on drawing.
FIG. 1 is a block diagram showing the configuration of a pipe brazing apparatus according to one embodiment. The pipe brazing apparatus 10 shown in FIG. 1 brazes and joins a connection joint 2 as a member to be joined to a pipe 1 shown in FIGS. 2 and 6 using ring solder 3 as a brazing material. It is composed of a brazing apparatus main body 11 and a control device 12 as control means. As shown in FIGS. 2, 3 and 6, the brazing apparatus main body 11 includes pipe fixing support means 13, connection joint holding means 14 as holding means for members to be welded, inert gas supply means 15, and heating means 16. , an ignition detection means 17, a rotation means 18, and a contact-type displacement sensor 19 as displacement detection means.

The pipe fixing and supporting means 13 fixes and supports the pipe 1 as shown in FIGS. A plurality of types of the pipe retainer 21 are prepared corresponding to the diameter of the pipe 1, and are attached to the pipe retainer 22 so as to be replaceable. The pipe retainer 21 clamps (grips) and fixes the pipe 1 between the hinged upper piece 21A and lower piece 21B. The pipe retainer 22 supports the pipe retainer 21 on the base 20 and supports the pipe 1 via the pipe retainer 21 . The toggle clamp 23 applies clamping force to the pipe retainer 21 . Moreover, the code|symbol 39 in FIG. 2 is a piping support.

Here, the pipe 1 fixed and supported by the pipe fixing and supporting means 13 has the connection joint 2 inserted through the ring brazing 3 at the end thereof as shown in FIG. 9(A). The ring brazing material 3 is a ring-shaped brazing material, and when the pipe 1 and the connection joint 2 are made of copper, a brazing material made of phosphorous copper brazing material (eg, BCuP-5) is generally used. , is preferable in that the use of flux becomes unnecessary.

2 and 6, the connection joint holding means 14 has a housing 24, a housing cradle 25, a joint adapter 26, a compression spring 27 and a spring case 28, of which the joint adapter 26 is a common adapter holder. It comprises a seat 26A and an adapter element 26B.

A housing cradle 25 supports the housing 24 on the base 20 . The housing 24 has a bearing bush 29 inside, and the cylindrical portion 30 of the adapter common seat 26A of the joint adapter 26 can be moved in the axial direction of the joint adapter 26 and around the axis of the joint adapter 26 by the bearing bush 29. Rotatable support.

26 A of adapter common receiving seats of the joint adapter 26 are comprised by the holder part 31 and the cylindrical part 30 being integrated. A plurality of types of the adapter element 26B of the joint adapter 26 are prepared according to the type of the connection joint 2, and are exchangeably attached to the holder portion 31 of the common adapter seat 26A. The joint adapter 26 holds the connection joint 2 inserted into the end of the pipe 1 using this adapter element 26B.

The base end of the spring case 28 is fixed to the housing 24, and the compression spring 27 is interposed between the tip and the cylindrical portion 30 of the adapter common seat 26A. The pipe 1 whose end is inserted into the connection joint 2 via the ring brazing 3 is clamped and fixed by the pipe retainer 21 of the pipe fixing support means 13, and compresses the compression spring 27 of the connection joint holding means 14. The joint adapter 26 is pressed in the direction of arrow O in FIG. As a result, the connection joint holding means 14 biases the connection joint 2 inserted into the end of the pipe 1 toward the pipe 1 by the biasing force of the compression spring 27, as indicated by the arrow P in FIG. is held by the joint adapter 26 and the housing 24 at .

As shown in FIGS. 1 and 2, the inert gas supply means 15 supplies nitrogen (N2) gas as an inert gas from the gas tank 32 through the nitrogen supply line 33 to the interior of the joint adapter 26 of the connection joint holding means 14. It is intended to be introduced into As a result, nitrogen gas is supplied to the inside of the connection joint 2 and the inside of the pipe 1 held by the joint adapter 26 to prevent the inside of the connection joint 2 and the pipe 1 heated by the heating means 16 from being oxidized. Film formation is suppressed. In addition to nitrogen gas, argon gas or the like may be used as the inert gas.

As shown in FIGS. 1 to 3, the nitrogen supply line 33 is provided with a nitrogen supply valve 34 and a flow control valve 35 in this order from the gas tank 32 side. The flow control valve 35 is for adjusting the supply flow rate of nitrogen gas, and is manually adjusted by the worker before the brazing work. Further, the nitrogen supply valve 34 performs the supply and cutoff of nitrogen gas to the joint adapter 26 by opening and closing the valve by electromagnetic force, and is controlled by the control device 12 as will be described later.

As shown in FIGS. 1 and 2, the heating means 16 includes a PLG supply line 37 that supplies PLG (liquefied petroleum gas) as a combustible gas from a gas tank 36, and an oxygen supply line 40 that supplies oxygen gas from a gas tank 38. , a heating torch 41 for emitting PLG and oxygen gas, and an ignition heater 42 for igniting the PLG emitted from the torch nozzle 41 A of the heating torch 41 . Here, PLG is preferably propane gas, acetylene gas, or the like.

As shown in FIGS. 1 and 3, the PLG supply line 37 is provided with a vapor tank 43, a PLG supply valve 44, a flashback prevention device 45, and a flow control valve 46 in this order from the gas tank 36 side. The flow control valve 46 is for adjusting the supply flow rate of PLG, and is manually adjusted by the worker before the brazing work. Also, the PLG supply valve 44 performs the supply and shutoff of the PLG to the heating torch 41 by opening and closing the valve by electromagnetic force, and is controlled by the control device 12 as will be described later.

As shown in FIGS. 1 and 3, the oxygen supply line 40 is provided with an oxygen supply valve 47, a flashback prevention device 48, and a flow control valve 49 in this order from the gas tank 38 side. The flow control valve 49 is for adjusting the supply flow rate of the oxygen gas, and is manually adjusted by the worker before the brazing work. Further, the oxygen supply valve 47 performs the supply and cutoff of oxygen gas to the heating torch 41 by opening and closing the valve by electromagnetic force, and is controlled by the control device 12 as will be described later.

As shown in FIGS. 3 and 4, the heating torch 41 is configured by attaching torch nozzles 41A to a substantially ring-shaped torch ring 41B at circumferentially equidistant positions, for example, at 120-degree equidistant positions. A plurality of, for example, three torch nozzles 41A are arranged in the vicinity of the connection joint 2 held by the connection joint holding means 14 . Also, the PLG supply line 37 and the oxygen supply line 40 are connected to the torch ring 41B. Thereby, the heating torch 41 can discharge the PLG from the PLG supply line 37 together with the oxygen gas from the oxygen supply line 40 around the connection joint 2 held by the connection joint holding means 14 from the torch nozzle 41A.

As shown in FIG. 2, a plurality of ignition heaters 42 are attached to a heater mounting seat 51 provided in the housing 24 in correspondence with the torch nozzles 41A of the heating torch 41 . The ignition heater 42 is preferably an SN heater (silicon nitride heater), for example. Each ignition heater 42 can be arranged in the vicinity of each torch nozzle 41A, and is turned ON when PLG is emitted from the torch nozzle 41A to ignite this PLG. A mixed gas of PLG and oxygen gas is emitted from the torch nozzle 41A after the above-described ignition, and the flame F (FIG. 1) at this time cuts the ring solder 3 inside the pipe 2 held by the connection joint holding means 14. Heat to melt.

Here, as shown in FIGS. 3 and 5, the PLG supply line 37, the oxygen supply line 40 and the heating torch 41 are supported by a movable table 52 having a carriage 53. As shown in FIG. A grip bar 50 is erected on the movable table 52 . The carriage 53 is engaged with a rail 54 laid on the base 20 to movably guide the movable table 52 in the front-rear direction of the brazing apparatus main body 11 when viewed from the front. As a result, the ends of the PLG supply line 37, the oxygen supply line 40, and the heating torch 41 are inserted into the connection joint 2 by operating the grip bar 50 and moving the movable table 52 outward. When fixing the pipe 1 to the pipe fixing support means 13, as indicated by the two-dot chain line in FIG. be done.

The ignition detection means 17 is, for example, a thermocouple arranged near the tip of the torch nozzle 41A of the heating torch 41, as shown in FIGS. The ignition detection means 17 detects that the PLG emitted from the torch nozzle 41A of the heating torch 41 is ignited and burned by the oxygen gas also emitted to raise the flame F (FIG. 1) to a predetermined temperature or higher. A detection signal from the ignition detection means 17 is output to the control device 12 shown in FIG.

As shown in FIGS. 2, 6 and 7, the rotating means 18 reciprocates the joint adapter 26 of the connecting joint holding means 14 by a predetermined angle while the heating means 16 is heating the connecting joint 2, thereby rotating the joint. It rotates (slides) the connection joint 2 held by the adapter 26 , and comprises a rotation motor 55 , a movable disc 56 , a motor shaft flange 57 and a crank 58 .

The rotation motor 55 is supported by the base 20 using a motor seat 59 . A motor shaft flange 57 is connected to the rotating shaft of the rotating motor 55, and the motor shaft flange 57 continuously rotates in the direction of arrow α in FIG. 7 when the rotating motor 55 is driven to rotate. The movable disc 56 is attached to and connected to the end of the tubular portion 30 of the joint adapter 26 so as to rotate integrally, and is connected to the motor shaft flange 57 via the crank 58 . The movable disk 56 is connected to the motor shaft flange 57 via the crank 58, so that when the motor shaft flange 57 continuously rotates in the direction α, it reciprocates by a predetermined angle in the direction of arrow β in FIG. As a result, the joint adapter 26 is also reciprocally rotated by a predetermined angle in the β direction like the movable disk 56 , and the connection joint 2 held by the joint adapter 26 is rotated (slided). This rotation (sliding movement) is substantially synonymous with a predetermined angle reciprocating rotational movement in the β direction.

As the connection joint 2 rotates (sliding) as described above while the connection joint 2 is heated by the heating torch 41 of the heating means 16, the connection joint 2 is uniformly heated in the circumferential direction by the heating torch 41 and , the brazing ring 3 heated and melted inside the connection joint 2 flows evenly over the joint surface between the connection joint 2 and the pipe 1, as shown in FIG. 9(B). In this manner, the melted ring solder 3 evenly flows over the joint surface between the connection joint 2 and the pipe 1, thereby suppressing the occurrence of blowholes or the like at the brazed joint.

The contact displacement sensor 19 is installed on the base 20 using a sensor seat 60, as shown in FIGS. When the connection joint 2 inserted into the end of the pipe 1 and held by the joint adapter 26 is displaced in the direction of arrow P (FIG. 6) by the biasing force of the compression spring 27 due to the melting of the ring solder 3, the displacement is It is detected by movement of the joint adapter 26 . When the contact-type displacement sensor 19 detects that the connection joint 2 is displaced by a predetermined value (by the thickness of the ring braze 3), the ring braze 3 interposed between the pipe 1 and the connection joint 2 is displaced. It is determined by the controller 12 that it has completely melted.

That is, as shown in FIGS. 6 and 10A, when the pipe 1 is not fixedly supported by the pipe fixing support means 13, the compression spring 27 of the connection joint holding means 14 is not compressed, and contact is made. The contactor 61 of the displacement sensor 19 is not in contact with the movable disc 56 attached to the joint adapter 26 of the connection joint holding means 14 . As shown in FIGS. 6 and 10B, the pipe 1 with the connection joint 2 inserted through the ring brazing 3 at the end is fixed and supported by the pipe fixing support means 13, and the connection joint 2 is , the contactor 61 of the contact-type displacement sensor 19 contacts the movable disk 56 when the compression spring 27 is pressed (compressed) in the direction of arrow O and held by the joint adapter 26 .

FIG. 10(C) shows that the ring solder 3 in the connection joint 2 inserted into the pipe 1 is heated by the heating means 16 and melted, and the connection joint 2 is rotated by the rotation means 18 to melt the ring. This is when the brazing filler metal 3 flows evenly over the joint surface between the pipe 1 and the connection joint 2 . At this time, as shown in FIGS. 6 and 10C, the connection joint 2, the joint adapter 26, and the movable disk 56 are urged in the direction of arrow P by the compression spring 27 of the connection joint holding means 14, and the ring brazing is carried out. The thickness of 3 (predetermined value) is returned. The contactor 61 of the contact-type displacement sensor 19 detects the predetermined displacement of the connection joint 2 through the joint adapter 26 and the movable disc 56 while in contact with the movable disc 56 . This detection signal is output from the contact displacement sensor 19 to the control device 12 as shown in FIG.

Instead of the contact displacement sensor 19 described above, a laser distance sensor 62 shown in FIG. 11 may be used as displacement detection means. That is, as shown in FIGS. 6 and 11A, the laser distance sensor 62 measures the distance to the movable disk 56 when the pipe 1 is not fixedly supported by the pipe fixing support means 13. FIG. As shown in FIGS. 6 and 11(B), the pipe 1 into which the connection joint 2 is inserted is fixed and supported by the pipe fixing support means 13, and the connection joint 2 pushes the compression spring 27 of the connection joint holding means 14. When held by the joint adapter 26 while being pressed (compressed) in the direction of arrow O, the laser distance sensor 62 measures the distance to the movable disc 56 .

Further, as shown in FIGS. 6 and 11(C), the ring brazing 3 in the connection joint 2 is heated by the heating means 16 and melted, and the connection joint 2 is rotated by the rotation means 18 to be melted. The brazing ring 3 flows evenly over the joint surface between the pipe 1 and the connection joint 2, and when the connection joint 2 is displaced in the direction of the arrow P by the thickness of the brazing ring 3 (predetermined value), the laser distance sensor 62 measures the distance to the movable disk 56 . Melting of the brazing ring 3 in the connection joint 2 is detected by obtaining the difference between the measured values of the laser distance sensor 62 in FIGS. 11B and 11C.

As shown in FIGS. 1 and 2, the control device 12 causes the ring brazing 3 interposed between the pipe 1 and the connection joint 2 inserted at the end of the pipe 1 to melt and the connection joint 2 to be removed from the pipe. Based on the detection signals from the ignition detection means 17 and the contact displacement sensor 19, the heating means 16 and It controls the operation of the rotating means 18 . Furthermore, the control device 12 controls the supply of nitrogen gas as an inert gas into the pipe 1 and the connection joint 2 before and after the heating means 16 and the rotating means 18 are operated. The control of the control device 12 described above will be described in detail mainly with reference to FIGS. 1 and 12. FIG.

Before turning on the power switch 63 and the start button 64 of the control device 12, the worker inserts the connection joint 2 into the end of the pipe 1 through the ring solder 3 as shown in FIG. 9(A). , the pipe 1 having the connection joint 2 and the ring brazing 3 is clamped and fixed to the pipe retainer 21 of the pipe fixing support means 13 shown in FIGS. When the pipe 1 is fixed, the connection joint 2 is held by the joint adapter 26 of the connection joint holding means 14 in a compressed state by pressing the compression spring 27 in the direction of the arrow O. As shown in FIG.

After the pipe 1 is fixed and supported by the pipe fixing support means 13 and the connection joint 2 is held by the connection joint holding means 14 as described above, the control device 12 is opened by an operator as shown in FIGS. The power switch 63 and the start button 64 are sequentially turned on (S11, S12). When the activation button 64 is turned ON, the controller 12 first opens the nitrogen supply valve 34 of the inert gas supply means 15 (S13), and supplies the nitrogen gas in the gas tank 32 to the pipe 1 through the nitrogen supply line 33. and supplied to the inside of the connection joint 2 . After this step S13, the control device 12 takes in the initial position of the contact displacement sensor 19 (S14).

Next, the controller 12 opens the PLG supply valve 44 of the heating means 16 (S 15 ) to discharge the PLG in the gas tank 36 from the torch nozzle 41 A of the heating torch 41 through the PLG supply line 37 . After the PLG is emitted from the heating torch 41, the controller 12 turns on the ignition heater 42 (S16) to ignite the PLG emitted from the heating torch 41. FIG. After that, the control device 12 opens the oxygen supply valve 47 (S17), discharges the oxygen gas in the gas tank 38 together with the PLG from the torch nozzle 41A of the heating torch 41 through the oxygen supply line 40, and discharges the flame F to the torch nozzle 41A. give rise to

After step 17, the controller 12 turns off the ignition heater 42 (S18). After the ignition heater 42 is turned off, the controller 12 determines whether the PLG emitted from the torch nozzle 41A of the heating torch 41 burns with oxygen gas and the flame F reaches a predetermined temperature or higher based on the detection signal from the ignition detection means 17. It is determined whether or not (S19). If the flame F at the torch nozzle 41A is below the predetermined temperature, the control device 12 determines that the ignition has failed and terminates the control.

When the flame F of the torch nozzle 41A is equal to or higher than the predetermined temperature in step S19, the control device 12 activates the rotating motor 55 of the rotating means 18 (S20) to move the connecting joint holding means through the movable disc 56. The joint adapter 26 of 14 is reciprocatingly rotated by a predetermined angle, and the connection joint 2 held by the joint adapter 26 is rotated (slung).

Next, based on the detection signal from the contact-type displacement sensor 19, the controller 12 controls the displacement of the connection joint 2 via the movable disk 56 and the joint adapter 26 when the displacement is equal to or greater than a predetermined value (thickness of the ring solder 3). Therefore, it is determined whether or not the brazing ring 3 in the connection joint 2 is melted (S21). Even if the displacement of the connection joint 2 is less than the predetermined value, the control device 12 determines whether or not a predetermined time has passed since the ignition heater 42 was turned on and the PLG from the heating torch 41 was ignited ( S22), it is determined again whether the displacement of the connection joint 2 is equal to or greater than a predetermined value. If it is determined in step S22 that the predetermined time has elapsed after the ignition of the PLG, the control device 12 determines that the brazing ring 3 in the connection joint 2 is incompletely melted, and terminates the control.

When the control device 12 determines in step S21 that the displacement of the connection joint 2 is equal to or greater than the predetermined value and that the brazing ring 3 in the connection joint 2 is well melted, the oxygen supply valve 47 of the heating means 16 is turned on. is closed (S23), the PLG supply valve 44 is closed (S24), and the operation of the heating means 16 is stopped. Further, the control device 12 stops the rotation motor 55 of the rotation means 18 to stop the operation of the rotation means 18 (S25), and the connection joint 2 held by the joint adapter 26 of the connection joint holding means 14 is rotated. Stop the rotation.

The control device 12 determines whether or not a certain period of time has elapsed after the PLG supply valve 44 was closed in step S24 (S26). Nitrogen gas is continuously supplied into 1 and connection joint 2 to cool these pipes 1 and connection joint 2 . After the predetermined time has elapsed, the control device 12 closes the nitrogen supply valve 34 of the inert gas supply means 15 to stop the supply of nitrogen gas to the pipe 1 and the connection joint 2 (S27). Finish brazing control.

With the configuration as described above, the present embodiment has the following effects (1) to (3).
(1) As shown in FIGS. 2 and 6, the control device 12 melts the brazing ring 3 interposed between the connecting joint 2 inserted at the end of the pipe 1 and the pipe 1 to Until the contact-type displacement sensor 19 or the laser-type distance sensor 62 detects that the pipe 2 is displaced by a predetermined amount toward the pipe 1 side, the heating means 16 and the rotating means 18 are controlled to operate. Therefore, while the heating torch 41 of the heating means 16 heats the connection joint 2 and melts the ring solder 3 in the connection joint 2, the rotation means 18 moves the joint adapter 26 of the connection joint holding means 14 to a predetermined position. Since the connection joint 2 is rotated by angularly reciprocating rotation, the melted brazing ring 3 flows evenly over the joint surface between the pipe 1 and the connection joint 2 . As a result, the pipe 1 and the connection joint 2 can be easily brazed with uniform quality without causing blow holes in the brazed joint between the pipe 1 and the connection joint 2 .

(2) Since the control device 12 controls the heating means 16 and the rotating means 18 to complete the brazing work between the pipe 1 and the connection joint 2, the connection joint 2 heated by the heating torch 41 of the heating means 16 and There is no need for workers to touch the pipe 1 with their hands. Therefore, it is possible to improve the safety of the brazing work.

(3) The control device 12 operates the inert gas supply means 15 before and after the operation of the heating means 16 and the rotating means 18 to supply nitrogen gas to the inside of the pipe 1 and the connection joint 2. is controlling As a result, the inner surfaces of the pipe 1 and the connection joint 2 heated by the heating means 16 can be prevented from being oxidized, so that the generation of an oxide film on the inner surfaces can be suppressed.

Although the embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. , is included in the scope and gist of the invention, and is included in the scope of the invention described in the claims and its equivalents.

DESCRIPTION OF SYMBOLS 1... Piping, 2... Connection joint (member to be joined), 3... Ring brazing (brazing material), 10... Pipe brazing apparatus, 11... Brazing apparatus main body, 12... Control device (control means), 13... Pipe fixation Support Means 14 Connection Joint Holding Means 15 Inactive Gas Supply Means 16 Heating Means 17 Ignition Detection Means 18 Rotation Means 19 Contact Displacement Sensor (Displacement Detection Means) 21 Piping Presser 24 Housing 26 Joint adapter 27 Compression spring 33 Nitrogen supply line 34 Nitrogen supply valve 37 PLG supply line 40 Oxygen supply line 41 Heating torch 41A Torch nozzle 42 ... ignition heater, 44 ... PLG supply valve, 47 ... oxygen supply valve, 55 ... rotation motor, 56 ... movable disk

Claims (5)

a pipe fixing and supporting means for fixing and supporting a pipe inserted into a member to be welded through a brazing material;
a member-to-be-joined holding means that holds the member-to-be-joined in a state of being urged toward the pipe and is provided so as to be axially movable and rotatable about the axis;
a heating means arranged in the vicinity of the member to be joined held by the member-to-be-joined holding means for heating the member to be joined to melt the brazing material;
Rotating means connected to the member-to-be-joined holding means for rotating the member-to-be-joined holding means back and forth by a predetermined angle while the member-to-be-joined is being heated by the heating means to rotate the member-to-be-joined around an axis. and,
a displacement detection means for detecting displacement of the member to be joined toward the pipe due to melting of the brazing material from the movement of the member to be joined holding means;
a control means for controlling to operate the heating means and the rotating means until the displacement detection means detects that the brazing material melts and the member to be joined is displaced toward the pipe by a predetermined amount; A pipe brazing device characterized by comprising: It further comprises inert gas supply means for introducing an inert gas into the holding means for the member to be joined and supplying the inert gas to the inside of the member to be joined and the piping. The pipe brazing device according to claim 1. The heating means includes a plurality of torch nozzles arranged in the vicinity of the periphery of the member to be joined held by the member-to-be-joined holding means for emitting a combustible gas together with oxygen gas, and a heating torch arranged in the vicinity of the tip of the heating nozzle. 3. The pipe brazing apparatus according to claim 1, further comprising an ignition heater for igniting combustible gas. 2. The apparatus according to claim 1, further comprising ignition detection means disposed near the tip of said heating nozzle for detecting that the combustible gas emitted from said heating nozzle is ignited and burned. 4. The pipe brazing device according to 3. 5. A pipe brazing apparatus according to claim 1, wherein said brazing material is a ring-shaped brazing material made of phosphorous copper.

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