JPS6121185Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly relates to a water-cooled flexible cable that connects a welding transformer and a welding gun, and in particular improves the structure of the connecting terminals connected to both ends of the cable.

A water-cooled flexible cable is formed by winding a conductor wire in a spiral shape, which is made by twisting together a large number of thin wires.
It is generally used as a reciprocating conductor for multi-spot welding machines and portable spot welding machines.

This type of cable is continuously subjected to complex motions such as bending motion and twisting motion related to the operation of the welding machine, and also suffers from resistance heat generation due to high current of 5000A to 15000A, thermal fatigue due to cooling water, and corrosion fatigue. Because they are used under such harsh conditions, they are subject to severe wear and tear, and accidents occur due to reductions in welding current due to broken cable wires and poor welding. Therefore, the flexible cable is treated as a consumable item and must be replaced frequently, so the lifespan of the cable has a great effect on work efficiency.

Conventional water-cooled flexible cables are made by fitting, for example, a wrap-shaped copper sleeve onto the cable ends of twisted conductor wires, and then applying strong pressure from the outer periphery of the copper sleeve to shape the outer periphery into a U-shape. Apply pressure in a W-shape to crimp the copper sleeve and the conductor,
This is either soldered within the terminal or, if a copper sleeve is not used, other mechanical fastening means are used to join the cable to the terminal.

However, in both of the joining methods, the joining part of the cable is crushed from one side into a U-shape or W-shape, so this joining part is relatively strong against bending inward in the U-shape or W-shape. However, it is weak against outward bending motion, causing problems such as wire breakage and accelerated deterioration.In both cases, copper sleeves and other fasteners are required, the structure is complex, and assembly time is required. There were drawbacks such as:

Furthermore, due to the structure of conventional water-cooled flexible cables, it is not possible to provide multiple water-cooling cavities;
Because two water cooling cavities can only be provided at one location in the U-shaped or W-shaped inner gap, it is difficult for the cooling water to flow all around the cable, and if the water cooling cavity becomes clogged, the cooling effect will not be achieved at all. There were some drawbacks that would go away.

As mentioned above, the present invention uses a mechanical tightening means such as a copper sleeve that does not require soldering, does not damage the cable material, and reliably connects the cable and the connecting terminal in a state close to the original shape of the material. The purpose is to significantly reduce manufacturing man-hours and significantly improve cooling effectiveness and durability.

Hereinafter, the present invention will be explained based on drawings of embodiments.

FIG. 1 is a perspective view showing the entire cable according to the present invention, partially showing the internal structure. FIG. 2 shows a state in which the cable and the terminal are connected, and FIG. 3 is an enlarged cross-section of the above-mentioned connected portion.

In FIGS. 1 to 3, reference numeral 1 denotes a cable, which is a single conductor wire 1a made of a large number of thin wires twisted together, which is wound in a spiral shape. 2 and 3 are
Connection terminals are connected to both ends of the cable, one connection terminal 2 is connected to a terminal of a welding transformer, and the other connection terminal 3 is connected to a welding gun.

The connection terminals 2 and 3 are formed with an opening connection part 5 that is integral with the copper body part 4, and the end of the cable is inserted into this opening connection part, and the end of the cable is inserted from the outer periphery of the opening connection part, for example. As shown in Figure 3, three directions A,
A strong pressure is applied from B and C to the recesses 6 ₁ , 6 ₂ ,
6 ₃ , the cable 1 and the opening connection portion 5 are crimped and fixed. That is, by pressing the cable and the opening connection part into a trefoil shape, it is possible to join the cable material without significantly destroying its original shape. Each of the recesses 6 ₁ , 6 ₂ , 6 ₃ formed on the outer periphery of the opening connection portion is provided with a water cooling cavity 8 by perforating each inclined surface 7 ₁ , 7 ₂ , 7 ₃ that moves to the body portion 4 and the opening connection portion 5 . ₁ , 8 ₂ , and 8 ₃ are formed, and these communicate with a water passage 9 formed in the body portion 4 of the connection terminal. The outer periphery of the cable is coated with an insulator 10, and the insulator 10 is tightened with a band 12 at the brake groove 11 of the body 4 of the connection terminals 2, 3.

Cooling water is injected from the water passage 9 of one connection terminal, passes through the water cooling cavities 8 ₁ , 8 ₂ , 8 ₃ of each recess, flows throughout the gap between the cable and the insulation, and flows into the water passage of the other connection terminal. flows.

From the above structure, according to the present invention, since the cable and the connecting terminal are crimped by applying pressure from multiple directions, the connecting part of the cable is not crushed into a U-shape or W-shape from one direction as in the past. It is possible to connect the cable in a natural state without destroying the original shape of the cable, significantly reducing cable breakage due to concentrated stress, and conventionally only one cooling water passage hole is provided on the outer periphery of the connection terminal. Since it is possible to provide at least three or more water-cooling cavities, the cooling effect can be further enhanced, and even if one water-cooling cavity becomes clogged, the remaining two water-cooling cavities can be used. Furthermore, since the cable and the connecting terminal are directly crimped, there is no need for mechanical fasteners such as copper sleeves or soldering as in the past. It has a simple structure and is extremely economical as it does not require many man-hours to manufacture, and it has great effects, such as being able to significantly extend the life of the cable.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the external appearance and internal structure of the cable according to the present invention. FIG. 2 is a side view showing the connection state of the cable and the connection terminal. Figure 3 is Figure 2-
Linear view. Explanation of symbols, 1... Cable, 2, 3... Connection terminal, 4... Body part, 5... Opening connection part, 6 ₁ ,
6 ₂ , 6 ₃ ... recess, 8 ₁ , 8 ₂ , 8 ₃ ... water cooling cavity, 9 ... water passage, 10 ... insulator.

Claims (1)

[Scope of utility model registration request] The end of a cable made of twisted multiple conductors is inserted into the open connection part that is integrated with the body of the connection terminal, and multiple recesses are formed around the outer periphery of the open connection part by applying strong pressure from multiple directions. The opening connection part and the cable are fixed by crimping, and each recess is provided with a water cooling cavity that communicates with the connection terminal's passageway at the transition from the body part to the opening connection part, and the outer periphery of the cable is covered with an insulating material. Water-cooled flexible cable for resistance welding.