JPS6325029Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the rotating electrode head of a seam welding machine, which allows a large current to pass through the rotating electrode to the welding location of the workpiece.

The rotating electrode head of this type of seam welding machine has a hollow space between the electrode shaft, which has a rotating electrode integrally attached to one end, and the circumferential surface of the electrode shaft on the inner circumferential side, which rotatably supports this electrode shaft. It is common to have a main body forming a chamber, and a power supply metal divided into a plurality of parts in the circumferential direction that connects the electrode shaft and the main body to each other is disposed in the hollow chamber. Conventionally, each power supply metal is pressed against the electrode shaft by an axial pressure spring interposed between the side plate of the main body and each power supply metal, and is formed on the main body by penetrating each power supply metal. An axial pressure spring interposed between a bolt screwed into one side wall of the hollow chamber and each power supply metal causes the bolt to be pressed against the side wall of the hollow chamber into which the bolt is screwed.

However, in the conventional rotating electrode head as described above, the contact between each power supply metal and the main body by the axial pressure means is made only on one side of the hollow chamber formed in the main body, so the contact resistance is low due to the lack of contact area. There was a problem that a sufficient welding current could not be obtained due to a large voltage drop. In addition, due to the voltage drop, the temperature of the rotating electrode head increases sharply, resulting in noticeable wear and tear on the power supply portion. Furthermore, since each power supply metal is pressed against one side of the hollow chamber by a bolt screwed into one side of the hollow chamber formed in the main body and an axial pressure means interposed between the power supply metal, the power supply metal If it remains placed in the hollow chamber,
The bolt could not be removed, and naturally the power supply metal could not be removed either. Therefore, in order to maintain the power supply metal, it is necessary to remove a portion of the main body along with the power supply metal from the electrode shaft.

The present invention was developed to solve the above-mentioned problems, and its purpose is to increase the contact area between the power supply metal and the main body to suppress voltage drop, provide sufficient welding function, and generate heat. It is an object of the present invention to provide a rotating electrode head for a seam welding machine, which suppresses wear and tear of the power feeding part caused by the welding process and facilitates maintenance and inspection of the power feeding metal.

Hereinafter, one embodiment of the present invention will be specifically described based on the drawings.

In FIG. 1, 1 and 2 are a pair of upper and lower rotating electrode heads, and these rotating electrode heads 1,
2, the part to be welded on the object A to be welded is held and energized, and is connected to terminal portions 3a, 3b of the transformer 3 via secondary conductors 4, 4. The rotating electrode head 2 is driven upward and downward by a driving source such as a pneumatic cylinder (not shown). Moreover, 4a is a flexible conductor formed of laminated copper plates.

The rotating electrode heads 1 and 2 each include an electrode shaft 6 made of chromium copper or the like with a rotating electrode 5 integrally attached to one end thereof, and a portion corresponding to the one end 6a and the other end 6b of the electrode shaft 6. The main body 9 is rotatably supported by bearings 7 and 8 disposed in the main body 9. To be more specific, the main body 9 has a series of hollow holes 10a, 1 in the axial center, respectively.
Consisting of a body 10 and a lid 11 having a diameter of 1a,
The lid body 11 is attached to one side of the body part 10 with a fixing screw 12, and the right end part 6 of the electrode shaft 6
A hollow chamber 13 is formed in a portion of the main body 9 corresponding to the center portion 6c between the left end portion 6b and the hollow hole 10a of the body portion 10 and a hollow hole 11a of the lid body 11 is formed with a hollow chamber 13. Insulator 33,
33, and these bearings 7 and 8 support the electrode shaft 6 concentrically and rotatably in the hollow holes 10a and 11a. .

In the hollow chamber 13, as shown in FIG. 3, a pair of power feeders each having semicircular arc-shaped inner peripheral surfaces 14c, 14c that can be fitted facing each other along the peripheral surface 6d of the electrode shaft 6 are provided. Metals 14, 14 are installed inside. The power supply metals 14, 14 are made of a material such as pure copper, and these pair of power supply metals 14, 1
4 are arranged in two rows in parallel along the axial direction of the electrode shaft 6. The cross section of the power supply metals 14, 14 in the axial direction includes a surface 14a along the axial direction of the electrode shaft 6 and a surface 14b perpendicular thereto, as shown in FIG.
The surface 14a along the axial direction is the circumferential surface 6 of the electrode shaft 6 as described above.
d. Further, the hollow chamber 1
Contact surfaces 13a and 13b are formed on both sides of the electrode shaft 6 in a direction perpendicular to the axial direction of the electrode shaft 6, and these contact surfaces 13a and 13b are connected to the surfaces 14b and 14b of the power supply metal 14, respectively. They are placed opposite each other so that they can come into contact with each other.

Reference numeral 15 denotes a pressure means, which includes an axial pressure means 16 and an axial pressure means 17. The axial direction pressurizing means 16 includes spring fitting holes 18 (in this embodiment, four pairs each) drilled along the axial direction in the surface 14b where the power supply metals 14, 14 of each row face each other. There are a total of 8 spring fitting holes.) in which axial pressure springs 16a are inserted.
energizes each row of power supply metals 14, 14 in the axial direction,
Each of the power supply metals 14, 14 can be pressed against the contact surfaces 13a, 13b of the hollow chamber 13 facing each other in a constant surface contact manner. Note that 19 is a lid for keeping the axial pressure spring 16a enclosed in the spring fitting hole 18.

The axial pressing means 17 is for pressing the semi-circular inner circumferential surface 14c of each power supply metal 14 against the circumferential surface 6d of the electrode shaft 6, and as shown in FIG. Spring fitting holes 20 (in this example, the left,
There are a total of 8 spring fitting holes on both sides of the right side. ) is fitted with an axial pressure spring 17a, and each power supply metal 14,
14 can be urged in the axial direction and brought into contact with the circumferential surface 6d of the electrode shaft 6. The side plates 9a, 9a are attached by bolts 32 to maintenance holes 9b, 9b formed on both sides of the main body 9, and the axial pressure spring 17a is attached to the side plates 9a, 9a.
At one end, there is an adjustment screw 21 screwed into the side plate 9a.
The strength of the axial pressure spring 17a can be adjusted with the adjustment screw 21, and the axial pressure spring 17a can be kept in a state enclosed in the spring fitting hole 20. urge In addition, when the abutting surfaces 13a and 13b of the hollow chamber 13 are made parallel to the mounting surface 22 of the body 10 and the lid 11 of the main body 9 as in this embodiment, the end surfaces 13a and 13b of the hollow chamber 13 are processed by machining the end surfaces using a lathe or the like. This has the advantage that it can be easily carried out and that it can be made into a highly accurate contact surface suitable for surface contact with the power supply metal 14.

The axial center of the electrode shaft 6 is provided with a core hole 6e in the longitudinal direction, into which a pipe 23 is inserted, and one end of this pipe 23 is integrally attached to the axial center of the lid 11. It is fixed with a support fitting 24. The support fitting 24 has an inlet 2 for supplying cooling water.
5 and an outlet 26 are opened, and an inlet 2
The cooling water that entered the pipe 23 from the pipe 23
A water channel 27a passing through the rotating electrode 5, a water channel 27b connected to the circuit 27a and provided in an arc shape around the rotating electrode 5, and a water channel 27b provided in the rotating electrode 5.
The cooling water is returned to the core hole 6e by successively passing through a water channel 27c which is connected to the core hole 6e and collects the cooling water to the core hole 6e. On the other hand, the right end 6a and the left end 6b of the main body 9
Water channels 28 and 29 for supplying cooling water are also provided in the main body, respectively, so that the right end 6a and left end 6b of the main body are cooled. In FIG. 2, 30 is a packing, 31 is a nut for retaining the bearing 7, and the upper and lower rotating electrode heads 1, 2 are driven by a screw attached to the outer peripheral surface of one or both of the rotating electrodes 5. This is performed by applying rotational force from a motor (not shown) serving as a driving source.

In the above configuration, when the main bodies 9 of the rotating electrode heads 1 and 2 are energized, the contact surfaces 13a and 13b of the main bodies 9
Power supply metal 14, 1 that is in contact with a, 13b
The welding current will flow through the main body 9 and the power feeding metal 14, 14, since the power feeding metals 14, 14 installed in the hollow chamber 13 are in surface contact with the contact surfaces 13a, 13a of the main body 9, respectively. The contact area of No. 14 is doubled compared to the case where the power supply metals are not arranged in two rows in parallel, but only come into contact with one contact surface. Therefore, even if a large current of 10,000 to 20,000 amperes required for welding functions flows, the contact resistance can be kept extremely low, and therefore the voltage drop at the power supply part can be kept extremely small. This can prevent the inability to obtain a sufficient welding current, which occurs when the voltage drop is large, or the wear and tear of the power supply part that occurs due to a rapid rise in the temperature of the rotating electrode heads 1 and 2. . Moreover, these power supply metals 14, 14 are
An axial pressure spring 16a interposed between the surfaces 14b facing each other, and an axial pressure spring 17a provided between the side plate 9a of the main body 9 and each of the power supply metals 14, 14 allow the inside of the hollow chamber 13 to be If you want to replace the power supply metals 14, 14, remove the bolts 32 on the main body 9 and remove the side plate 9.
Power supply metal 1 can be easily connected by removing a and 9a.
4 and 14 can be taken out, which is extremely convenient for maintenance management.

Although the above has shown one embodiment of the present invention, the design can be changed without departing from the gist of the present invention. For example, each power supply metal 14 in the above embodiment was divided into two pieces in the circumferential direction that can be fitted facing each other along the circumferential surface of the electrode shaft, but this is divided into three or more pieces to form a set. It may be as follows.

As described above, the present invention consists of arranging two sets of power supply metals divided into multiple parts in the circumferential direction in parallel in the axial direction in a hollow chamber, and interposing an axial pressure means between the opposing surfaces of these two sets of power supply metals. The side surfaces of each pair of power supply metals are pressed against the side surfaces of the hollow chamber, and an axial pressure means is interposed between the side plate of the main body and each power supply metal, and the inner peripheral surface of each power supply metal is pressed around the electrode axis. Since it is in contact with the surface and the side plate of the main body is removable, the power supply part from the main body to the power supply metal will not come into contact even when the large current of 10,000 to 20,000 amperes required for the welding function flows. The resistance can be kept extremely low and the voltage drop across the feed section can be kept very low, so that not only can the required sufficient welding current be obtained, but also the temperature rise of the rotating electrode head can be reduced. This can prevent the phenomenon of wear and tear on the power supply portion from becoming severe and becoming noticeable.
In addition, each power supply metal is operated by an axial pressure means interposed between the opposing surfaces of the two sets of power supply metals, and an axial pressure means interposed between the side plate of the main body and each power supply metal. Because it is held in the hollow chamber,
By removing the side plate of the main body, it can be easily taken out from the hollow chamber for maintenance and inspection. As described above, the rotary electrode head of a seam welding machine according to the present invention has excellent effects in that the welding function is improved and maintenance and inspection to maintain the function can be performed extremely easily.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a schematic front view of the main parts of a seam welding machine, FIG. FIG. 1, 2... Rotating electrode head, 6... Electrode shaft, 9
...Main body, 13...Hollow chamber, 13a, 13b...
Contact surface, 14... Power supply metal, 15... Pressure means, 16... Axial direction pressure means, 17... Axial direction pressure means.

Claims (1)

[Claims for Utility Model Registration] An electrode shaft with a rotating electrode integrally attached to one end;
A main body rotatably supports this electrode shaft via an insulating material and forms a hollow chamber between the electrode shaft and the central peripheral surface of the electrode shaft, and a main body is disposed within the hollow chamber and conducts the electrode shaft and the main body. In a rotating electrode head of a seam welding machine equipped with a plurality of power supply metals divided in the circumferential direction, two sets of power supply metals divided in the plurality in the circumferential direction are arranged in parallel in the axial direction in the hollow chamber, and these two sets of power supply metals are arranged in parallel in the axial direction in the hollow chamber. An axial pressure means is interposed between the opposing surfaces of the power supply metals to press the side surfaces of each pair of power supply metals to the side surfaces of the hollow chamber, respectively, and axial pressure is applied between the side plate of the main body and each power supply metal. A rotary electrode head for a seam welding machine, characterized in that means is provided to press the inner circumferential surface of each power supply metal to the circumferential surface of the electrode shaft, and the side plate of the main body is removable.