JP3185999B2 - Magnetic detection method for inserted wires - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[Industrial application] When crimping a steel core aluminum stranded wire inserted into a sleeve with a detent clamp or jumper socket, this stranded wire does not reach the bottom of the hole of the sleeve, resulting in incomplete connection. May be. The present invention relates to a detection method for preventing this.

[0002]

2. Description of the Related Art In many cases, an electric wire that has been pushed to the bottom of a hole is actually crimped as it is, leaving a gap between the bottom of the hole and the end of the electric wire. Since the compression is performed starting from the position corresponding to the bottom of the hole, the effective crimping width is reduced by the gap in this case, resulting in incomplete connection. This may cause heat generation at this point, and in some cases may lead to accidental pullout of the jumper wire. In order to avoid this, as a method of detecting the position of the electric wire end in the aluminum sleeve after crimping, a method utilizing magnetism is disclosed in Japanese Patent Publication No. 60-34.
790. After the permanent magnet magnetizes the steel core wire of the entire compressed part, the magnetic detector is moved along the connection part, and the position of the steel core wire is detected by the deflection of the meter of the detector. However, moving the magnetic detector along the connection is cumbersome, and it is unavoidable that the pass / fail judgment is not sharp. In addition, the detection is not performed after the compression, and unless it is performed immediately before the start of the compression work, the effectiveness cannot be obtained.

[0003]

A permanent magnet and a magnetic sensor are mounted on one side of an upper or lower die, and a magnetic field is formed on the same side by the former, and a change in the magnetic field by a steel core wire is detected by the latter. Be prepared to do it. Mark the point A on the surface of the sleeve corresponding to the bottom of the hole. This sleeve is inserted between the two dies, and is fed from the other side of the dies in the direction of the magnetic field with the mouth side as a tail. When the mark A comes at a fixed distance from the side surface of the die, the steel core wire changes the magnetic field to be magnetized, and the action causes the meter of the magnetic sensor to fluctuate.
Confirm this and activate the dice. Although a portion of the wire end is not compressed, the sleeve hole must be deepened accordingly, but this loss is not a problem compared to the benefit of reliably preventing a bad connection.

[0004]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The compressor C is located at a height of the tower, and the hydraulic pump P is located on the ground. (FIG. 4). Upper and lower dies 1, 2 of the compressor are supported by holders 1a, 2a, respectively. The permanent magnet 3 is fixed to the side surface of the holder 2a, and forms a magnetic field along the side surface as shown in FIG. The center of the magnetic field is shown by a line MM in FIGS. Separately, the magnetic sensor 4 is mounted on the same side. The magnetic sensor 4 reacts only to the steel core wire that has been immersed in the magnetic field MM, converts a change in the magnetic field due to the change into a change in the current, and transmits the change as a radio wave. The oil pump P includes a receiver 5 and is activated by receiving this radio wave. As shown in FIGS. 1 and 2, the sleeve A with the mark A at the position corresponding to the hole bottom is inserted between the upper and lower dies 1 and 2, and is fed from left to right in the figure. 1 and 2 show a case where the point A is located at a position α from the side surface of the die and is located to the right over the MM line. In FIG. 1, since the electric wire E reaches the hole bottom and the steel core wire crosses the MM wire, the magnetic field MM changes, and the magnetic sensor 4 detects this. This detection is simultaneously performed by the hydraulic pump on the ground
It is transmitted to the receiver 5 of P. This drives the hydraulic pump
Then, the compression operation of the upper and lower dies is started by the oil supply. FIG. 2 shows a case where there is a gap V between the wire end and the hole bottom. Mark A
The magnetic sensor does not respond even if is set to the same position as above. After removing the sleeve from the die and correcting it, you will see the reaction again. Since the wire MM and the steel core wire are orthogonal to each other, both detection and pass / fail determination can be reliably performed. Since the detection is performed immediately before compression, there is no defective connection. Japanese Patent Application Laid-Open No. 54-60487 and others are known as having the same purpose as the present invention. However, any of them is for detecting insufficient wire insertion using a magnetic sensor after compression, and a construction error can be found. But it cannot be prevented. On the other hand, in the present invention, when the sleeve is compressed, as long as the electric wire is not correctly inserted into the sleeve, even if the operator turns on the compressor, it does not operate. It is a feature that construction errors are completely prevented.

[0005]

[Effect] The occurrence of connection failure can be eliminated.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a relationship among a die, a sleeve, and a magnetic field line.

FIG. 2 is the same explanatory drawing when there is a gap in a sleeve.

FIG. 3 is an explanatory diagram of a magnetic sensor.

FIG. 4 is a diagram showing a positional relationship between a compressor and an oil pump.

[Explanation of symbols]

 1, 2 upper and lower dies 1a, 2a upper and lower holder 3 permanent magnet 4 magnetic sensor 5 receiver S sleeve E electric wire V air gap C compressor P hydraulic pump

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-60487 (JP, A) JP-A-56-55801 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01V 3/08 H01R 43/048

Claims (1)

(57) [Claims] 1. A magnetic field is formed on one side of a pair of upper and lower dies, and a sleeve into which a steel core aluminum stranded wire is inserted is fed between the two dies by a predetermined length from the other side of the die with the sleeve mouth as a tail. When the end of the steel core wire appears in this magnetic field, the magnetic sensor detects changes in the magnetic field due to the steel core wire.
The change is converted to an electrical signal, and the hydraulic pump drive control
Magnetic detection method for inserted wires, characterized by controllability
Law.