JPH06262344A - Automatic torch brazing machine - Google Patents

Abstract

PURPOSE:To uniformly heat a part to be brazed by jetting LPG flame, and to attain a satisfactory brazing state by rotating at least one nozzle around the part to be brazed, or arranging plural nozzles at an equal distance to a part to be brazed. CONSTITUTION:An automatic torch brazing machine 1 is equipped with a carrier 3 holding the work 2 of a heat exchanger, etc., and a movable table 4 consisting of a belt conveyer, etc., as a moving means moving this carrier 3 to a prescribed position. Also, the machine is constituted of a lift 5 lifting parts 6 and 6 to be brazed of the work 2 to a nozzle part, a flame-jetting means 7 and 7 heating the parts 6 and 6 to be brazed of the work 2, and a rotational means 8 and 8 of a nozzle part holding the nozzle part of this flame-jetting means at a fixed distance from the part to be brazed and making it rotate at a prescribed angle. Thus, since the part to be brazed can be uniformly heated by jetting LPG flame, a satisfactory brazing state is attained, the work is simplified, and efficiency is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates mainly to an automatic torch lowing machine for attaching a heat exchanger and the like to a pipe.

[0002]

2. Description of the Related Art Conventionally, aluminum welding with argon gas has been known as a method for fixing a pipe to a heat exchanger, for example. This method is mainly performed by manual welding or automatic welding by a robot, but in the case of argon gas welding, the back bead is generated due to the strong heat and the flow resistance of the heat exchanger becomes large. However, it has the disadvantages of high fuel cost, pinholes, etc.

Further, since the pipe fixed to the heat exchanger bends in a predetermined direction as soon as it rises from the welded portion, it becomes difficult to rotate the crater portion circumferentially with respect to the welded portion, which results in uneven welding. There is a problem in that

[0004]

For this reason, the present invention provides an automatic torch-loose machine which can uniformly join the joining parts to be joined and eliminate the above-mentioned various problems. is there.

[0005]

The invention according to claim 1 uses a moving means for moving a joining object having a brazed portion on which a brazing material is mounted to a predetermined position, and an LPG. A flame releasing means having at least one crater portion facing the brazed portion so as not to interfere with the joining target, and a crater portion of the flame releasing means at a constant distance from the brazed portion. And a crater portion rotating means for rotating the crater portion by a predetermined angle. Further, the invention according to claim 2 moves a joining target having a brazed portion to which a brazing material is attached to a predetermined position. And a plurality of crater portions that are arranged around the brazed portion so as not to interfere with the joining target and that are fixed to the brazed portion with a constant distance using the moving means and the LPG. And a flame releasing means having.

[0006]

Therefore, in the invention described in claim 1,
While the crater portion keeps a certain distance with respect to the brazed portion and is rotated by the crater portion rotating means, a flame from LPG having a lower temperature than the flame of argon gas is radiated to evenly the brazed portion. Since it can be heated, the brazing material can be evenly welded to the part to be brazed, and in the invention of claim 2, a plurality of crater parts are fixed with a certain distance to the periphery of the part to be brazed. Therefore, since the flame from the LPG can be evenly radiated to the brazed portion, the brazing material can be evenly welded to the brazed portion without rotating the crater portion, and the above-mentioned problem can be achieved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention described in claim 1 will be described below with reference to the drawings. Machine 1 with automatic torch lower shown in FIG.
Includes a carrier 3 for holding the work 2 such as a heat exchanger, a moving table 4 including a belt conveyor as a moving means for moving the carrier 3 to a predetermined position, and the brazed portions 6, 6 of the work 2. A lift 5 for elevating to the crater part described below, and flame releasing means 7, 7 for heating the brazed parts 6, 6.
And the crater portion rotating means 8, 8 for rotating the crater portion of the flame releasing means 7, 7.

The work 2 is, for example, a heat exchanger as shown in FIG. 2, and the heat exchanger main body 20 mounted on the carrier 3 is used.
And a pipe position fixing holder 2 provided on the carrier 3.
5, 26, 27, one end of which is constituted by an inlet pipe 23 and an outlet pipe 24 which are fitted into a refrigerant inlet 21 and a refrigerant outlet 22 formed in the heat exchanger body 20, respectively. 23, a portion where the refrigerant outlet 22 and the outlet pipe 24 are joined and which is bonded by a brazing material is the brazed portion 6. Flux is applied to the portion 6 to be brazed, and an annular brazing material 90 is mounted as shown in FIG.

The flame releasing means 7 in this embodiment, as shown in FIG. 3, includes a pair of crater portions 70 provided opposite to each other,
A pair of crater arm 7 for holding each of these craters 70
1 and a holding plate 72 that holds each of the crater arm 71, and a hose 78 that sends a mixture of LPG and air to the crater 70 is provided inside the crater arm 71. 78 is an LPG not shown
It is connected to the supply hose 79 and the air supply hose 80.

The holding plate 72 is a crater arm 7
1 has elongated holes 75 into which the screw portion 73 fixed to 1 is inserted, and by fixing the screw portion 73 with a nut 74, the distance between the crater portion 70 and the brazed portion 6 can be adjusted. It has become. Also, the holding plate 7
A screw hole 76 is formed at the center of the screw hole 2.
A crater angle adjusting protrusion 77 is provided at a position separated by a predetermined distance from.

As shown in FIG. 4, this holding plate 72 is fixed by bolts 81 to the bottom surface of a drive shaft 82 which is attached through the frame 50. The bottom surface of the drive shaft 82 is provided with a screw hole 87 into which the bolt 81 is screwed, and a plurality of holes formed on the circumference at regular intervals with a predetermined distance from the screw hole 87. The position of the holding plate 72 with respect to the drive shaft 82 is determined by inserting the crater angle adjusting protrusion 77 into a predetermined hole and fixing it with a bolt 81. Therefore, the initial position of the crater portion 70 is set. can do.

As a result, as shown in FIG. 2, since the bending directions of the pipes 21 and 22 are different between the refrigerant inlet 22 side and the refrigerant outlet side 21, their mounting positions are changed.
When the work 2 is lifted, the crater 70 and the pipe 21 or 22 do not collide.

The drive shaft 82 is connected to a drive device 84 composed of, for example, a motor actuator or an air cylinder, and the drive shaft 82 is operated by the drive device 84 as shown in FIG. 5 in this embodiment. It is rotated by 90 degrees from the position indicated by A to the position indicated by B (the crater rotation means 8). In this embodiment, the drive device 84 is provided on each drive shaft 82, 82, but both drive shafts may be rotated by one drive device.

In the automatic torch lobe machine 1 having the above structure, as shown in FIGS. 5 and 6, when the brazed portion 6 is lifted up to a predetermined position, a mixture of LPG and air is generated from the crater portion 70. The flame is radiated, and the crater part 70 is moved from the brazed part 6 along the circumference indicated by the one-dot chain line C in FIG.
Rotate back and forth for a predetermined time at an angle of degrees.

Due to the flame caused by the LPG, the brazed portion 6 is uniformly heated at 2000 ° C. for a predetermined time, the annular brazing material 90 is melted and evenly flows into the gap between the inlet pipe 23 and the refrigerant inlet 21. . Thereafter, the work 2 descends, the part 6 to be brazed separates from the crater 70, radiates heat, and is cooled, so that the brazing material is solidified and the inlet pipe 23 and the refrigerant inlet 21 are bonded. Similarly, the outlet pipe 24 and the refrigerant outlet 22 are also bonded. By this, LP
The torch with the flame release of G does not generate back beads (buildup on the back side of the welded pipe) because the heat power is weaker than that of argon gas, there is no weld buildup (brazing material) on the surface, and the cost of fuel used is low. That is, it is possible to perform brazing at two places at the same time.

Even when the single crater portion 70 is used, the brazed portion 6 is heated evenly by rotating the crater portion 70 on the circumference of the circle excluding the portion where the pipe interferes. Alternatively, a plurality of craters may be rotated, and the number, position, rotation range, etc. of the craters 70 are changed depending on the shape of the brazed portion 6 and the shape in the vicinity of the brazed portion 6. This makes it possible to attach articles of various shapes to the torch.

As an embodiment according to the invention described in claim 2, the one shown in FIG. 7 can be considered. The crater portion 70 'in this embodiment is an annular crater 7 with a part cut away.
0a and a plurality of craters 70a formed on the inner peripheral surface of the annular crater portion 70a, the plurality of craters 70a are equidistant from the brazed portion 6 as shown in FIG. Is the position of. Also, the cutout portion 70
c is formed in order to arrange the crater around the brazed portion 6 without being disturbed by the bent pipe. Thereby, also in the invention described in claim 2,
It is possible to obtain the same effect as that of the invention described in claim 1.

[0018]

As described above, according to the present invention, at least one crater is rotated with respect to the brazed portion, or a plurality of craters are arranged at an equal distance with respect to the brazed portion. As a result, the brazed portion can be uniformly heated by the flame released by the LPG, so that a good brazed state can be obtained. Further, since the temperature of the flame released by LPG is lower than that of the flame released by argon gas, there is no back bead, no weld deposit on the surface, no pinhole, etc., as compared with conventional argon welding. In addition to the effects, effects such as simplification of work, good efficiency, and cost reduction can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an outline of a machine with an automatic torch lower according to an embodiment of the present invention.

FIG. 2 is a plan view of a heat exchanger as a work.

FIG. 3 is an exploded perspective view showing an example of a flame releasing means of the present invention.

FIG. 4 is a front view showing an example of a crater rotating means of the present invention.

FIG. 5 is an explanatory diagram of two craters and a brazed portion.

FIG. 6 is an explanatory view seen from the same side surface.

FIG. 7 is a perspective view of a crater portion of an embodiment according to the invention described in claim 2.

FIG. 8 is an explanatory diagram of an embodiment according to the invention of claim 2;

[Explanation of symbols]

 1 Machine with automatic torch lower 2 Work 3 Carrier 4 Moving stand 5 Lift 7 Flame releasing means 8 Crater rotating means

Claims (2)

[Claims] 1. A moving means for moving a joining target having a brazed portion to which a brazing material is attached to a predetermined position, and LPG is used to face the brazing subject so as not to interfere with the joining target. Flame releasing means having at least one crater portion, and crater rotating means for rotating the crater portion of the flame releasing means at a predetermined angle with respect to the part to be brazed by a predetermined angle. A machine with an automatic torch lo. 2. A moving means for moving a joining target having a brazed portion to which a brazing material is attached to a predetermined position, and an LPG, which is arranged around the brazed portion so as not to interfere with the joining target. And a flame releasing means having a plurality of craters fixed at a fixed distance from the part to be brazed, the automatic torch lowing machine.