JPS6310522Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a defect detector for insulated wires that is capable of simultaneously detecting pinholes, bare spots, etc. in addition to protrusions on the wire surface using one compact device.

Generally, with insulated wires made using painting methods, such as enamelled wires and formal wires, grain-like protrusions may form on the insulating layer on the surface of the wire or cavities may appear in the insulating layer due to various reasons during the manufacturing process. So-called pinholes may be formed, or in rare cases, bare spots with no coating may be formed.

For this reason, electric wires have traditionally been manufactured while detecting and observing these protrusions, pinholes, bare spots, etc.

Conventionally, when detecting the above-mentioned protrusions, an insulated wire is generally run through the die hole of a movably installed die, and when the protrusion comes, the protrusion and the die hole are caught, causing the die to move. So,
Devices and the like are used that detect the presence of protrusions by detecting this movement, but these protrusion detection devices cannot detect pinholes or bare spots due to their construction.

Conventionally, when detecting these pinholes and bare spots, based on the cause of the spark test method, a high An insulation defect detection device is used that applies voltage and detects the presence of pinholes and bare spots by generating sparks.

Therefore, when detecting pinholes, bare spots, etc. in addition to the protrusions mentioned above, it is necessary to connect the protrusion detection device using the above-mentioned die and the insulation defect detection device using the Sparkstet method in series in the running direction of the electric wire. must be installed in combination with

However, combining two devices in series as described above requires a considerable amount of space.
In particular, in the case of an enamel printing machine having multiple heads and a plurality of wire running lines, the space problem is serious because the installation space for one line is extremely limited. Moreover, installing the two devices separately is not preferable in terms of cost.

The present invention was developed in view of the existing circumstances, and its purpose is to create a compact device that can simultaneously detect protrusions, pinholes, and bare spots on the surface of electric wires using a single device. The present invention provides a defect detector for insulated wires.

The present invention is characterized in that a metal detection die that also serves as an electrode is movably and insulated and has a die hole slightly larger than the outer diameter of the insulated wire, and is installed in a small insulating case body. If a high voltage is applied to the protrusion,
Since the die moves when this protrusion hits the die hole, this movement is detected.
In the case of pinholes or bare points, sparks are generated, so this spark phenomenon is detected at the point.

Hereinafter, one embodiment of the present invention will be explained in detail with reference to FIGS. 1 to 3.

Reference numeral 1 denotes a small case body, which has a structure that can be divided into upper and lower parts at point P, and is preferably made of synthetic resin or other insulating material, and an insulating stand 2 is installed as the middle bottom near the bottom of the case body. be. Since this insulating stand 2 is equipped with a metal detection die 3 as a spark test component, a high voltage line 4 for applying a high voltage to it, etc., it is made of a highly insulating material such as a highly insulating synthetic resin or ceramic. This configuration is desirable because stable pressure resistance can be obtained in combination with the insulating material of the case body 1, but it can be omitted if the case body itself is made of a highly insulating material.

The shape of the metal detection die 3 is not particularly limited, but in the case of this embodiment, it is an inverted cylindrical body with a bottom, and has a die hole 5 in the center of the bottom, and the open lower end is used for fixing lead wires. A cap 6 is fitted. The die hole 5 is a hole slightly larger than the outer diameter of the insulated wire W to be inspected. Insulated wires W are passed through small holes 1a, 2a, 6a, and 1b, which are formed in the bottoms of the insulating stand 2 and the cap 6, respectively, so as to be considerably larger than the outside diameter of the wires. Therefore, if the insulated wire W has a protrusion, the protrusion is caught in the die hole 5, so that the detection die 3 is lifted and moved together with the insulated wire W.

Means for detecting movement of the detection die 3 is provided on the left and right side surfaces of the case body on the exit side of the running insulated wire W. In the case of this embodiment, this detection means is
A light emitting window 9 and a light receiving window 10 are formed of a light emitting element 7 and a light receiving element 8, and are bored on the left and right sides of the case body.
They are installed according to their wishes. In other words, the movement of the detection die 3, that is, the presence of the protrusion, is detected by blocking light. On the other hand, it is also possible to install the light emitting element 7 and the light receiving element 8 on the left and right sides of the case where the light emitted is blocked by the detection die itself so that the movement of the detection die 3 can be detected by sunlight. Of course it's a good thing.

The high-voltage wire 4 is fixed to the insulating table 2 with a one-piece fixing screw 11, etc., and is connected to the metal detection die 3 via a high-voltage lead wire 12 to apply a high voltage.

In order to simultaneously detect protrusions, pinholes, bare spots, etc. of the insulated wire W using the defect detector of the present invention configured as described above, the following procedure may be performed. First, as shown in FIGS. 1 and 2, the lead wire 12 of the high voltage wire 4 is connected to the metal detection die 3 by the cap 6
The insulated wire W is passed through the die hole 5. In this way, the electric wire W can run smoothly and at the same time, the lead wire 12 can be securely clamped and held. Once set in this manner, the light emitting element 7 and the light receiving element 8 of the detection means are operated, and at the same time, a high voltage is applied between the conductors of the high voltage line 4 and the insulated wire W to cause the insulated wire W to travel. As shown in FIG. 3, if there is a protrusion A on the surface of the wire, this protrusion A will be caught in the die hole 5, so that the detection die will be lifted together with the running wire, and at the same time it will come into contact with the upper inner wall surface of the case body 1. In order to block the light emitted from the light emitting element 7, the movement of the detection die 3, that is, the presence of the protrusion A, is detected by the light receiving element 8. Incidentally, the detection die 3 and the cap 6 that have been lifted upward automatically return to their original positions after the protrusion of the insulated wire W passes through the die hole. In addition, if there are pinholes or bare spots on the wire surface, sparks will occur between the wire conductor and the detection die 3, so by reading the short circuit current with an electric device, the presence of pinholes or bare spots can be detected. be done.

The material of the high voltage lead wire 12 may be other than metal wire, such as conductive rubber, and the cap 6 can hold the high voltage lead wire 12.
For example, a rubber band or the like may be used as long as it has the function of being electrically connected to the detection die 3.

As explained above, according to the present invention, a metal detection die having a die hole and serving as an electrode is movably and insulated installed inside a small case body, and a high voltage is applied using a high voltage lead wire. In addition, since a means for detecting the movement of the detection die is provided, it is possible to provide an extremely compact defect detector for insulated wires that simultaneously detects pinholes and bare spots in addition to protrusions on the wire surface. . Therefore, the defect detector of the present invention is particularly useful in cases such as an enamel printing machine having multiple heads and a plurality of wire running lines, and is also extremely advantageous in terms of cost.

Note that the means for detecting the movement of the dice is not limited to optical means, and may be replaced by other means such as a limit switch. In addition, it can be widely applied not only to enameled wires and formal wires, but also to other wires in which problems such as protrusions, pinholes, and bare spots occur.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional front view showing an embodiment of the insulated wire defect detector according to the present invention, Fig. 2 is a longitudinal sectional side view of the same detector, and Fig. 3 shows the state in which the metal detection die is moved. It is a vertical partial front view. 1...Case body, 3...Metal detection die, 4
...High voltage line, 5...Dice hole, 7...Light emitter,
8... Light receiving element, 12... High voltage lead wire.

Claims (1)

[Scope of utility model registration request] an insulating case body through which an insulated wire runs; a metal detection die movable inside the case body having a die hole slightly larger than the outer diameter of the insulated wire through which the insulated wire is passed; and the die. 1. A defect detector for an insulated wire, comprising: a detection means for detecting movement of the insulated wire; and a high-voltage lead wire drawn into the case body and applying a high voltage to the metal detection die.