JPH0456087A - Method for detecting terminal position of steel-cored aluminium twisted wire in aluminium compressed sleeve - Google Patents

Abstract

PURPOSE:To detect a terminal position of a steel-cored aluminium twisted wire easily by using a bar magnet which can rotate at a position of a center of gravity as a sensor, and using the character of the steel-cored aluminium twisted wire and the bar magnet that they are attracted to each other to detect a terminal position of the steel-core. CONSTITUTION:A case 8 of a sensor 7 is made to abut on a compression part 4A of an aluminium compressed sleeve 4 to be moved in the longitudinal direction thereof. In the case that a steel core 2 exists in the compression part 4A at a position where the case 8 abut on, one pole of a bar magnet 9 (S pole closer to the steel core 2 in a figure) and the steel core 2 are attracted to each other with the magnetic force, and the bar magnet 9 is directed at right angle with the compression part 4A like A position. In the case that the sensor 7 exists in B position that the steel core 2 does not exist within the compression part 4A, since one pole (S pole in the figure) of the bar magnet 9 and a closest part of the steel core 2 are attracted to each other with the magnetic force, the bar magnet 9 is directed to a terminal of the steel core 2, namely, a terminal of a steel-cored aluminium twisted wire 1. A terminal position of the steel-cored aluminium twisted wire 1 can be detected by detecting the direction of the bar magnet 9 with a movement of the sensor 7.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is directed to an aluminum compression sleeve inner steel wire for detecting the terminal position of a steel core aluminum stranded wire that is compressed and connected in an aluminum compression sleeve such as a compression type jumper sleeve. The present invention relates to a method for detecting the terminal position of a twisted aluminum wire.

[Prior Art] When securing the installation terminal of a steel-core aluminum stranded wire, an aluminum compression sleeve is compressively connected to the end of the steel-core aluminum stranded wire,
This aluminum compression sleeve is held in place.

In this case, if the steel-core aluminum stranded wire is not fully inserted and compressed into the aluminum compression sleeve, the contact resistance between the steel-core aluminum strands and the aluminum compression sleeve will increase, so the steel-core aluminum This can lead to an accident in which the stranded wire comes loose from the aluminum compression sleeve.

In order to prevent such accidents from occurring, conventional methods have been to magnetize the steel core of the steel-core aluminum stranded wire inside the aluminum compression sleeve with a permanent magnet from outside the aluminum compression sleeve, and then set the magnetic detector to the compression of the aluminum compression sleeve. The end position of the steel core was detected by detecting the magnetism of the steel core while moving along the section (Japanese Patent Publication No. 34790/1983).

[Problems to be Solved by the Invention] However, such a detection method requires a process of magnetizing the steel core of the steel-core aluminum stranded wire, and thus has the problem of being time-consuming. Another problem was that a strong permanent magnet for magnetizing the steel core was required.

An object of the present invention is to provide a method for detecting the end of a steel core aluminum stranded wire in an aluminum compression sleeve, which makes it easier to detect the end of the steel core than in the past.

[Means for Solving the Problems] To explain in detail the present invention for achieving the above object, the present invention provides a method for controlling the end position of a steel core of a steel core aluminum stranded wire that is compression-connected within an aluminum compression sleeve. In a method for detecting the end position of a steel-core aluminum stranded wire inside an aluminum compression sleeve, a sensor having a bar magnet rotatably supported at the center of gravity is used, and the sensor is placed outside the aluminum compression sleeve along its longitudinal direction. The end position of the steel core of the steel core aluminum stranded wire is detected from the orientation of the bar magnet.

[Function] When a bar magnet that is rotatable at the center of gravity is used as a sensor in this way, the bar magnet has the property of attracting magnetic materials, so
The steel core of the steel core aluminum stranded wire and the bar magnet are attracted to each other,
The end position of the steel core can be detected from the orientation of the bar magnet without magnetizing the steel core.

[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. The steel core aluminum stranded wire 1 has a structure in which aluminum wires 3 are twisted around the outer periphery of a steel core 2. One end of an aluminum compression sleeve 4 is compressively connected to the end of the steel-core aluminum stranded wire 1. That is, one end of the aluminum compression sleeve 4 has a wire insertion hole 5.
is provided, and the end of the steel-core aluminum stranded wire 1 is inserted into the wire insertion hole 5 and is compressed and connected. The compressed portion 4A of the aluminum compression sleeve 4 compressed in this manner has, for example, a hexagonal cross section. The other end of the aluminum compression sleeve 4 is secured to a retaining clamp 6.

As a sensor 7 for detecting the end position of the steel core 2 of the steel core aluminum stranded wire 1 in the aluminum compression sleeve 4, a bar magnet 9 having a length of, for example, about 5 cm is housed in a case 8 made of transparent plastic or the like. The bar magnet 9 has an axis 10 at its center of gravity.
Use a structure that is rotatably supported by.

The case 8 of such a sensor 7 is attached to an aluminum compression sleeve 4
4A and move it in the longitudinal direction. If the steel core 2 is present in the compression part 4A at the position where the case 8 is in contact, one pole of the bar magnet 9 (in the figure, the S pole near the steel core 2) will be magnetically attracted to the steel core 2. Accordingly, the bar magnet 9 is oriented substantially perpendicular to the compressed portion 4A as in the A position. Compression section 4A
If the sensor 7 is located at the 8th position where the steel core 2 is not present, one pole of the bar magnet 9 (in the figure, the S pole) is located at the steel core 2.
The bar magnet 9 faces the end of the steel core 2, that is, the end of the steel core aluminum stranded wire 1. By observing the direction of the bar magnet 9 as the sensor 7 moves in this manner, the end position of the steel-core aluminum stranded wire 1 can be known.

When performing detection work in a live wire state, the sensor 7 is attached to the tip of an insulating rod and moved.

FIGS. 2(A) and 2(B) show an example of a specific configuration of the sensor 7. FIG. The sensor 7 of this embodiment has a case 8.
A guide plate 11 made of aluminum or the like is attached to the bottom surface of the aluminum compression sleeve 4.
It has a structure in which a guide recess 12 that fits into A is provided.

Such a sensor 7 is installed in a guide recess 12 of a guide plate 11.
is fitted into the compression part 4A of the aluminum compression sleeve 4 and moved while in contact.

In this way, the distance between the compression section 4A and the sensor 7 can be maintained constant while the sensor 7 can be moved, and detection can be performed more accurately.

FIGS. 3(A) and 3(B) show other examples of specific configurations of the sensor 7. FIG. This embodiment shows an example in which the case 8 is provided vertically on the guide plate 11. Both sides of the case 8 are transparent, and the shaft 10 is oriented parallel to the guide plate 11.

With this structure, the direction of the bar magnet 9 can be seen from the moving direction of the sensor 7, and the sensor 7 can be monitored by the second
This method is easier to perform than those shown in Figures (A) and (B), and the workability of detection is improved.

[Effects of the Invention] As explained above, in the method for detecting the end position of a steel-core aluminum stranded wire in an aluminum compression sleeve according to the present invention, a bar magnet rotatable at the center of gravity is used as a sensor. The end position of the steel core can be detected by utilizing the property of attraction between the steel core and the bar magnet. Therefore, in the present invention, the work of magnetizing the steel core is no longer necessary, and the terminal position of the steel-core aluminum stranded wire can be detected more easily than before.

[Brief explanation of drawings]

Figure 1 is a vertical sectional side view of the main part showing the implementation state of the detection method of the present invention, and Figures 2 (A) and (B) are front views and side views showing an example of a specific configuration of the sensor used in the present invention. , Figure 3 (
A) and (B) are a front view and a plan view showing other examples of specific configurations of the sensor used in the present invention. DESCRIPTION OF SYMBOLS 1... Steel core aluminum stranded wire, 2... Steel core, 3... Aluminum wire, 4... Aluminum compression sleeve, 4A... Compression part, 5... Electric wire insertion hole, 6...・Retention clamp, 7...
・Sensor, 8... Case, 9... Bar magnet, 10...
- Shaft, 11... Guide plate, 12... Guide recess. Figure 1 Figure 3 Zukechi 2 [

Claims (1)

[Claims] In a method for detecting the end position of a steel core aluminum stranded wire in an aluminum compression sleeve, which detects the end position of a steel core aluminum stranded wire compressed and connected in an aluminum compression sleeve, a rod rotatably supported at the center of gravity is used. Using a sensor with a magnet,
The inner steel of the aluminum compression sleeve is characterized in that the sensor is moved along the longitudinal direction outside the aluminum compression sleeve to detect the end position of the steel core of the steel core aluminum stranded wire from the orientation of the bar magnet. Method for detecting terminal position of twisted aluminum wire.