JPH0621127Y2 - Flexible conductor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a flexible conductor useful when used as a power supply conductor of a robot welding machine such as an automobile.

[Technical Background of the Invention and its Problems] Conventionally, as a conductor for a water-cooled cable for a portable spot welding machine, as shown in FIG. 1, a conductor 1a is arranged from a child aligned rightward at the center, and The conductor 2 is known from the parent formed by aligning the conductor 1b from the seven children arranged in the right direction above with the conductor 1c in the left direction, and further aligning the conductor 1c with the child from the 12 children aligned further above it in the right direction. ing.

However, in such a water-cooled cable conductor,
Since the conductors 1b and 1c are aligned in opposite directions to each other from the child, that is, when the bending and twisting motions are caused by the point contact between the twisting layers of the conductor from the child, the twisting of the conductor from the child is performed. Conductor 1b, 1 from child between layers
c c rubbed each other, and finally, the wire constituting the conductor was worn and broken from the child in about 2 days.

On the other hand, in such a water-cooled cable conductor, a linear terminal 4 (hereinafter referred to as "I-type terminal") having a cooling hole 3 is attached to the end of the conductor 2 from the parent as shown in FIG. However, in such a configuration, since the I-shaped terminal 4 is linearly connected to the conductor 2 from the parent, excessive stress concentration is applied to the terminal opening 5 when subjected to severe bending, and the conductor 2 from the parent is connected at the terminal opening. There was a problem that it was broken.

[Object of the Invention] The present invention has been made in view of such a point, and it is possible to increase the contact area of the conductors with respect to the child, and consequently to reduce the tension applied to the flexible conductor to increase the life. It is intended to provide a conductor.

[Outline of the Invention] In the flexible conductor of the present invention, a conductor is formed in a hose for filling cooling water by a parent conductor formed by concentrically forming a plurality of conductors from a child obtained by twisting a plurality of strands. A flexible conductor to be used without being fitted or loosely fitted in the hose, in which the strands of the conductor of the adjacent child are set in different directions, and the strands of the conductor are concentric with the parent. The twist direction is characterized by the same direction in each layer.

[Embodiment of the Invention] Hereinafter, the present invention will be described with reference to the drawings of an embodiment. In FIG. 3, S is a conductor from a child in which 76 wires having an outer diameter of 0.26 mm are aligned in the right direction, and Z is a conductor from a child in which the same number of wires is aligned in the left direction. ing.

Then, the conductors S and Z are alternately arranged from the children so as to be adjacent to each other in the circumferential direction, and the conductors S and Z are respectively provided from the respective children in the right direction in each layer, that is, the first to third layers. The conductor 2'is formed concentrically with the parent according to the present invention. The parent conductor 2'is used in a state in which water is put in a hose which surrounds the conductor 2'with a required gap or in a state where the hose is not provided, that is, in a water-cooled state or an air-cooled state.

The conductor disposed in the center is not limited to the conductor extending in the right direction, and may be aligned in the left direction.

Next, the attachment of the L-type terminal to the conductor will be described with reference to FIG. As shown in the figure, first, the end of the conductor from the parent is covered with a molding sleeve 6 made of a copper sleeve or the like, and compressed so that a recess 7 along the length direction is formed in the upper part, and the end of the conductor from the parent is compressed. Firmly fixed to.

Next, the compressed molding sleeve 6 is inserted into the conductor insertion opening 8 of the I-shaped terminal 4 similar to the conventional one, and fixed with the solder 9.

Then, a metal plate 11 made of an iron plate or the like is arranged at the tip portion 10 of the I-type terminal 4 so as to be orthogonal thereto, and the joint portion between the both is firmly fastened with a bolt 12.

In the above-described embodiment, the L-type terminal is composed of the conventional I-type terminal and the metal plate fastened so as to be orthogonal thereto, but the present invention is not limited to this. You may use what was formed in the L shape by the thing.

Next, four types of test samples were prepared as shown in the table below, and the results of conducting a combined bending and twisting test on these samples will be described based on FIG.

In the above table, the term “with a hose” refers to a flexible conductor 2 ′ with a rubber hose with reinforcement (a rubber hose made of natural rubber and butylene butadiene rubber embedded with polyester braid) loosely fitted therein. In addition, “without hose” refers to a flexible conductor without such a rubber hose with reinforcement.

For the test, set a sample with a length of about 1 m in a test machine simulating the actual use situation and bend it twice at ± 90 ° C.
The twisting complex exercise was performed at about 20 times / minute.

From Fig. 5, by aligning the conductors from the child in the same direction in each layer, good characteristics are shown for both I-type and L-type terminals. It can be seen that the life of disconnection is extended by making the mold.

By the way, comparing sample 2 and sample 2 ', it can be seen that the life has been extended about 11,000 times.

FIGS. 6 and 7 show the results when a flexible conductor bending / twisting combined test was conducted by the same test method as that shown in FIG. 5 by pouring water into the reinforced rubber hose. From the figure, sample 1
And Sample 1'show almost the same characteristics, and it can be seen that the number of disconnections can be extended by 1.85 times by using Samples 3 and 3 ', that is, the terminal L type. This is because the direction of the conductor is alternately opposite to that of the child of the flexible conductor, the layers are aligned in the same direction, and the I-type terminal is changed to the L-type terminal.
It is considered that the stress concentration applied to the conductor and the wear between the wires were alleviated.

In short, it can be seen from the above test results that the sample 2'has the best performance after the sample 4'without the hose.

As described above, according to the present invention, the multiple strands of the conductor from the child whose strands are twisted from the right and the multiple strands of the conductor from which the strands of the strand are twisted from the left are arranged in the circumferential direction. Since the frictional contact between the conductors and the conductors when the flexible conductor is bent are made to be in line contact with each other, the abrasion between the conductors can be significantly reduced. Further, since all the twisted directions from the concentricity of the conductor with respect to the parent are made to be the same direction, stress concentration between layers due to twisting of the flexible conductor can be relaxed. That is, for example, as shown in FIG. 3, each layer is alternately arranged so that the first layer and the third layer are in the right direction and the intermediate second layer is in the left direction on the outer circumference of the conductor arranged in the center. In the case of concentricity, when the flexible conductor is twisted in one direction, the first layer and the third layer are tightened, the intermediate second layer is loosened, and partial stress concentration occurs between the layers, resulting in a conductor. In contrast, if the conductors are concentric with respect to the concentric direction rather than the parent, for example, all of them are aligned in the right direction, when the flexible conductor is twisted clockwise, the twisting of each layer is When twisted in the clockwise direction, the layers move in a looser manner, so that stress concentration between the layers can be relieved, and the disconnection life of the flexible conductor can be greatly increased.

From the above, in the present invention, there is no risk of the wires being easily broken due to bending motion acting on the intermediate portion of the flexible conductor, and even if twisting motion acts on the mouth of the terminal of the flexible conductor. It is possible to provide a flexible conductor which can greatly increase the life of disconnection as a whole without fear of concentration between layers.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a twisted state of a conventional flexible conductor, FIG. 2 is an explanatory view showing a mounted state of a conventional I-type terminal,
FIG. 3 is an explanatory view showing a twisted state of the flexible conductor of the present invention, FIG. 4 is an explanatory view showing an attached state of the L-shaped terminal, and FIG. 5 is a resistance of each sample under bending and torsion combined test. FIG. 6 is an explanatory view showing the relationship between the ratio and the number of repetitions, FIG. 6 is an explanatory view showing the same relationship as FIG. 5 when I type terminals are attached to each test sample, and FIG. 7 shows L for each test sample. It is explanatory drawing which shows the relationship similar to FIG. 5 at the time of attaching a mold terminal. S ... conductor from right side child Z ... conductor from left side child 2 '... conductor from parent 4 ... I type terminal 4' ... L type terminal

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A conductor comprising a parent obtained by concentrically forming a plurality of conductors from a child in which a large number of strands are combined
A flexible conductor which is loosely fitted in a hose for filling cooling water or is used as it is without being loosely fitted in the hose, and the twisting directions of the strands of the conductor from the adjacent child are different from each other. The flexible conductor is characterized in that the direction of concentricity of the conductor from the parent is the same direction in each layer.