JPH0144222Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly involves applying a voltage to a carbon electrode that is brought into pressure contact with a component to be brazed having a round outer peripheral surface such as a copper tube. The present invention relates to an electric brazing machine that is configured to heat and melt a brazing material using electrical resistance heat generated between the two to bond members together.

A commonly known electric brazing machine of this type is the one shown in FIG. The copper tube 5 is placed so that a pair of carbon electrodes 1a' and 1b' are pressed against each other at approximately bisecting positions in the circumferential direction of the copper tube 5.
A' is sandwiched between the carbon electrodes 1a', 1b' and the copper tube 5a', and the copper tube 5a is heated using electric resistance heat between the carbon electrodes 1a' and 1b' and the copper tube 5a'. In order to bond the copper tubes 1a', 5a' uniformly over the entire circumference, it is necessary to uniformly heat the outer periphery of the copper tubes 5a'. It takes a considerable amount of time for heat to be uniformly transferred from the contact point to the entire circumferential surface of the copper tube. Therefore, the conventional electric brazing machine equipped with only a pair of carbon electrodes 1a' and 1b' has poor working efficiency for large-diameter pipes and has a narrow range of application for pipe diameters.

In view of this point, as shown in FIG.
A third carbon electrode 1 is placed at or approximately the center of b′.
c' is extended to form a three-electrode electric brazing machine,
A component 5' to be brazed having a large circumference, such as a large diameter copper tube, is heated with three carbon electrodes so that the entire component 5' to be brazed is uniformly heated in a short time. However, if the position of the central third carbon electrode 1c' among the three carbon electrodes 1a', 1b', and 1c' is constant, the diameter will change as shown in Fig. 4B. When used for different parts 5' to be brazed, the carbon electrodes 1a', 1b', 1c' are arranged offset on the outer periphery of the part 5' to be brazed, and are arranged uniformly along the outer peripheral surface where heating efficiency is highest. The arrangement state for each phase difference interval is destroyed, and even though it is effective in improving work efficiency for pipes of a specific diameter, the effect of improving work efficiency for parts to be brazed with different diameters is not the same as the three-pole method. There is a drawback that it is relatively low.

In view of these circumstances, the present invention reliably and easily creates a state in which the work efficiency increasing effect, which is the original function of a three-electrode electric brazing machine, can always be maximized regardless of the diameter of the parts to be brazed. The purpose is to make it possible.

The electric brazing machine according to the present invention, which was made to achieve the above object, has a characteristic configuration including a pair of carbon electrodes that can be oscillated relative to each other, and a third carbon electrode provided at the center or almost the center between the pair of carbon electrodes. carbon electrodes, and each of the carbon electrodes is arranged so as to be spaced apart from a constant or almost constant phase difference in the circumferential direction of a virtual circle inscribed at the point of contact with the member to be brazed. In the electric brazing machine, the third carbon electrode is moved in a phase difference interval relative to the carbon electrode in the circumferential direction of the virtual circle in conjunction with the relative distance swinging of the carbon electrode pair. The virtual circle is provided with an interlocking mechanism that slides the virtual circle in a direction that changes the size while maintaining the size of the virtual circle.

The effects of the present invention having such a characteristic configuration are as follows.

In other words, the electrode arrangement has the highest heating efficiency, in which the three carbon electrodes are always positioned at a constant or almost constant phase difference on the outer peripheral surface of the component to be brazed, regardless of the diameter of the component to be brazed. can be reliably manifested with an extremely simple and minimal operation such as relative distance-to-far movement of one pair of carbon electrodes among the three, and therefore,
While it does not complicate work operations and is easy to handle, it always maximizes the work efficiency improvement effect, which is the original function of a three-electrode electric brazing machine, regardless of the diameter of the parts to be brazed. I was able to make it work.

Next, an embodiment of the configuration of the present invention will be described based on the drawings.

As shown in FIG. 1, 3 is the main body of the electric brazing machine, 1a, 1b, 1c are electric wires 6a, 6b, 6, respectively.
The left and right carbon electrodes 1a and 1b are extended from the main body 3 side so as to move relatively near and far when the operator grasps the grip handles 7 and 7 of the main body 3, Further, the third carbon electrode 1c located at the center slides toward the main body 3 when the left and right carbon electrodes 1a, 1b move in a direction away from each other due to the interlocking mechanism 4,
On the other hand, if the carbon electrodes 1a, 1b, 1c are moved toward each other, they slide in the direction of protruding from the main body 3, and the three carbon electrodes 1a, 1b, 1c are in contact with each other at their respective contact points n... A virtual circle 2 is located at a constant or almost constant phase difference in the circumferential direction of the copper tube 5a, which is an example of the attachment member 5, and is formed on the outer circumferential surface of the copper tube 5a while maintaining the phase difference interval in the circumferential direction. The structure is such that the position can be changed and fixed in the direction in which the size of the image changes.

Further, the interlocking mechanism 4 includes 8a and 8b.
are a pair of left and right gears integrally connected to the main body 3, a second small diameter gear 10 meshes with a first small diameter gear 9 which rotates integrally with one of the gears 8b, and the second small diameter gear 10 and the center The rack 12 formed on the side surface of the mounting rod 11 of the carbon electrode 1c engages with the carbon electrode 1c, and by gripping the gripping handles 7, 7, the third carbon electrode 1c is attached to the left and right carbon electrodes 1a, 1.
It is configured to slide in and out in conjunction with the distance movement of b.

Further, reference numeral 13 denotes a spring that biases both grip handles 7, 7 in a direction in which they open from each other.

Moreover, instead of the interlocking mechanism 4 consisting of a combination of the plurality of gears 8a, 8b, 9, 10, links extending inward from both grip handles 7, 7 as shown in FIG. The gripping handles 7, 7 are held together by the spring 13 by a link mechanism 15 formed by connecting the mounting rod 11 of the central carbon electrode 1c with a pin to the tips of 14, 14.
By gripping the central carbon electrode 1c against the urging force of the left and right carbon electrodes 1a, 1b
It may be configured to slide in and out in conjunction with the distance movement of the object.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of drawings]

The drawings show an embodiment of the electric brazing machine according to the present invention, and FIG. 1 is a partially cutaway overall plan view including the main parts;
FIG. 2 is a plan view showing another embodiment, FIG. 3 is a plan view showing a conventional example, and FIGS. 4A and 4B are plan views showing a comparative example. 1a, 1b, 1c...carbon electrode, 5...brazing member, n...contact point, 2...virtual circle, 4
...Interlocking mechanism, 8a, 8b, 9, 10...gear,
15...link mechanism.

Claims (1)

[Claims for Utility Model Registration] 1. A pair of carbon electrodes that can freely swing relative to each other.
a, 1b and their carbon electrode pair 1a, 1b
and a third carbon electrode 1c provided at the center or approximately the center position between them, and each carbon electrode 1a, 1b, 1c is inscribed in the contact point n to the member 5 to be brazed 5. The electric brazing machine is arranged so as to be spaced apart from a constant or almost constant phase difference in the circumferential direction of a circle 2, and the third carbon electrode 1c is connected to the carbon electrode pair 1a, 1b. The virtual circle 2 is slid in a direction in which the size of the virtual circle 2 is changed while maintaining the phase difference interval with respect to the carbon electrodes 1a and 1b in the circumferential direction of the virtual circle 2 in conjunction with the relative perspective swing of the virtual circle 2. An electric brazing machine equipped with an interlocking mechanism 4. 2 The interlocking mechanism 4 has a plurality of gears 8a, 8b,
The electric brazing machine according to claim 1 of the utility model registration claim, which is constituted by a combination of elements 9 and 10. 3. The electric brazing machine according to claim 1, wherein the interlocking mechanism 4 includes a link mechanism 15. 4. The electric brazing machine according to any one of claims 1 to 3, wherein the third carbon electrode 1c has two contact points with the member 5 to be brazed.