JPH0329020Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a rotating MIG welding torch that can be applied to consistent welding from the initial layer to the extra welding of pipe joints in chemical plants, nuclear power plants, etc.

(Prior Art) Conventionally, no MIG welding device has been developed that is compact, allows the welding torch to rotate continuously in a fixed direction, and can continuously supply a large current for a long period of time.

(Problems to be solved by the invention) In order to improve welding efficiency and welding quality, the present invention supplies a large current to the welding torch body and rotates it continuously to increase the welding amount width, and also increases the welding width in the direction of rotation. Rotary MIG that allows precise control of welding conditions
This is a welding torch developed.

(Means for solving the problem) This invention supplies shielding gas, electricity, and cooling water to the upper part of the welding torch body, whose tip is inserted into the case, in order to continuously rotate the welding torch with a large current. A curved tip is installed at the tip of the main body, and the circumference in the rotating direction is detected in two parts by a sensor installed close to the case, and the welding conditions (current control) are determined for each part. It is characterized by the ability to perform combined control.

(Function) In the present invention, since the cooling water from the slip-ring mechanism is cooled together with the welding torch body and the slip-ring body, a large current can be continuously supplied, thereby improving welding efficiency. In addition, stable welding can be achieved because the proximity sensor detects the trajectory in the rotational direction in two parts and changes the strength of the welding current into a pulsed form.

(Embodiment) As shown in FIGS. 1 to 4, the motor 5 is attached to the upper part of the case 10, and the spur gears 11a, 11b,
11c, an insulating tube 12, and a support shaft 13, the tip of the welding torch main body 2 is inserted into the rotating mechanism section 1, which is provided with an insulating cylinder 12, and a support shaft 13. It consists of a triple structure with an inner cylinder 15 and an outer cylinder 16 as a cooling water channel, and a cooling water supply port fitting 1 is installed on the upper part.
7 has an integral structure with an inner cylinder 15 and an outer cylinder 16. Further, the inner tube 14 is integrated with a rotating shaft 18 which is a power supply section for welding current. Also, inside the inner tube 14 is a wire guide tube 1.
9 is inserted up to the curved tip 20 at the tip, and is screwed onto the rotating shaft 18 at the top and sealed. As shown in FIGS. 3 and 4, the slip ring mechanism 3 includes a cooling water supply fitting 17 and a rotating shaft located on the upper part of the welding torch body 2 in the center hole of a slip ring body 22 made of a conductive material wrapped in an insulating cover 21. Insert the one that is connected with 18 with a bolt, and then
Carbon brush 23 from the 3 cut windows of 2
a, 23b, 23c to the rotating shaft 18 and the spring 24a,
It is pressed against 24b and 24c. The carbon brushes 23a, 23b, and 23c are connected to the body 22 by electric wires 26, and the upper part of the rotating shaft 18 has a horizontal hole up to the center hole, which is sealed with O-rings 27a and 27b above and below to connect the body 22.
Shielding gas is supplied from the horizontal hole through the hose fitting 6, passes through the gap between the hole in the rotating shaft 18 and the wire guide tube 19, and flows from the horizontal hole at the tip of the inner tube 14 through the orifice 28 into the shield cup 29. .

In addition, the hose fittings 7a and 7b are attached to the lower part of the body 22, and the cooling water is supplied to the inner cylinder 15 of the torch body 2 through the horizontal hole of the body 22, and the horizontal hole of the supply port fitting 17.
Water is circulated through the outer cylinder 16. For power supply, a bolt 8 is screwed into the body 22, and a captire cable 30 is connected to the tip of the bolt 8.

Further, three sensors 4a, 4b, 4c are attached close to the case 10 of the rotation mechanism 1, and three detection bodies 31a, 31b, 31 are attached to the support shaft 13 attached to the welding torch 20.
c, (31b is not shown because it is on the paper side) are provided on the horizontal plane corresponding to the sensors 4a to 4c. The detection body 31b is attached to the support shaft 13 at a position perpendicular to the bending direction of the tip of the torch 20, and each of the detection bodies 3
1a and 31c are attached to the support shaft 13 so as to be shifted vertically in a 90° left and right direction with the detection body 31b as the center. With this configuration, it is possible to detect the rotational circumference into two parts and set welding conditions. This will be explained with reference to FIGS. 5 to 7.

As shown in FIGS. 5 and 6, in order to align the rotation center of the welding torch with the center of the width of the groove, the bending direction of the tip 20 is oriented perpendicular to the width of the groove, that is, in the direction of welding progress. The position is determined by detecting the detection body 31b attached to the support shaft 13 with the sensor 4b. 7th from this position
As shown in the figure, welding is started under welding condition 1, and the torch is rotated. The torch starts from the starting point b.
When located at point c after turning 90 degrees, the detection body 31c provided on the support shaft 13 is detected by the sensor 4c, and the welding condition is switched to welding condition 2 as shown in FIG. Point a where the torch further turns 180° from point c
, the detection body 3 provided on the support shaft 13
1a is detected by the sensor 4a, and the welding condition returns to 1 as shown in FIG.

By repeating the above operations, the circumference of the torch rotation is divided into two, and welding conditions 1 and 2 are switched. The rotation of the torch after the welding is completed is detected by the sensor 4b.
It stops at the position where 1b is detected.

(effect) The present invention has the following effects.

(1) The rotary welding torch and slip-ring mechanism are compactly integrated, which has a good cooling effect, which allows a large current to be continuously supplied and improves welding efficiency.

(2) Since the rotating circumference can be detected in two parts by the proximity sensor, stable welding can be achieved by selecting welding conditions for each part.

[Brief explanation of drawings]

Figures 1 to 4 show an example of the rotary MIG welding torch of the present invention, and Figure 1 is a front view;
Fig. 2 is a top view, Fig. 3 is a side sectional view, Fig. 4 is a sectional view taken along line A-A' in Fig. 3, and Fig. 5 shows the detection of the rotational circumference divided into two in the welding torch of the present invention. FIG. 6 is a schematic diagram for explaining, FIG. 6 is a view taken in the direction of arrow A in FIG. 5, and FIG. 7 is a schematic diagram for explaining switching of welding conditions by detecting the rotation circumference divided into two parts. 1...Rotating mechanism section, 2...Welding torch main body, 3
...Slip spring mechanism section, 4a, 4b, 4c...
...Sensor, 5...Motor, 15...Inner cylinder, 16
...outer tube, 20...chip, 22...slip ring body, 31a, 31b, 31c...detection object.

Claims (1)

[Scope of utility model registration request] The upper part of the welding torch main body is inserted into the case of the rotating mechanism section to which a rotating device such as a motor is attached, and a slip ring mechanism for supplying shielding gas, electricity and cooling water is provided on the upper part of the welding torch, and the above-mentioned A bendable tip is rotatably attached to the lower end of the welding torch body, and three sensors are provided near the case, and one sensor is mounted on the rotating part of the welding torch body in a direction perpendicular to the bending direction of the tip. A rotary MIG welding torch, characterized in that one detection body is provided in each of the left and right directions to detect the rotational circumference of the welding torch body in two parts to select welding conditions.