JP3400837B2 - Stranded wire terminal straightening device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a straightening process for linearly aligning stranded conductors at the end of a cable having stranded conductors. The present invention relates to a stranded conductor terminal straightening device. 2. Description of the Related Art In general, a conductor such as a power cable is formed by twisting strands having an appropriate wire diameter. When such cables are connected, the end faces of the stranded conductors of the cables to be connected to each other are abutted, and a compression sleeve is put on the end faces to perform compression integration. In such a case, it is necessary that each of the stranded conductors is linearly and correctly aligned in advance, and that some of the strands are not bent or disturbed. Stranded wire conductors that have just been stripped of their terminal portions are usually aligned and suitable for connection. However, if any force is applied to the wires before the connection work, each wire will disturb its arrangement,
The straightening process is required before the connection work. FIG. 2 is an explanatory diagram of the contents of preliminary processing when connecting, for example, an insulated wire cable. The figure shows the contents of the cable terminal processing in chronological order from the top. First, the stranded wire conductor 1 of the insulated wire is stripped of the coating 2 for a predetermined length. The insulated wire cable 2 is a cable in which each wire is covered with an insulator in order to suppress a so-called skin effect. Therefore, when connecting this stranded conductor using a compression sleeve or the like,
It is necessary to previously remove the insulator of each strand. FIG. 2 shows a cable terminal after such an insulator removing operation has been completed. That is,
As shown in this figure, the ends of the stranded conductor 1 are separated by the insulation removing process. In this case, first, as shown in the figure, the stranded conductors 1 are bundled by the band 3. Then, as shown in the figure, the temporary fixing sleeve 4 is put on the stranded conductor 1. The temporary fixing sleeve 4 is made of a metal such as copper or aluminum. In this state, the stranded conductor 1 is gradually reduced in diameter by using various dies (not shown) together with the temporary fixing sleeve 4. The stranded conductor 1 made of copper, aluminum, or the like is usually deformed by such a compression process, and is reshaped according to the shape of the temporary fixing sleeve 4. Then, as shown in the figure, the split die 5 is used to remove the temporary fixing sleeve 4, the outer peripheral surface of the temporary fixing sleeve 4 is scratched, and the temporary fixing sleeve 4 is destroyed. In this way, the stranded conductor 1 is straightened as shown in FIG. 1 and then compressed using a compression sleeve or the like. FIG. 3 is an explanatory view of another conventional straightening method. The method of using the temporary fixing sleeve 4 as described above is as follows.
It is necessary to use the band 3 to bind the stranded conductor 1 to the temporary fixing sleeve 4 in advance. The method shown in FIG. 3 does not require such a pretreatment and shapes the stranded conductor 1 in order using various dies. That is, as shown in the figure, the stranded conductor 1 is sandwiched between elliptical dies 7A having an elliptical inner surface in advance. Next, as shown in the figure, the stranded conductor 1 is compressed using a die having a circular inner surface. By appropriately repeating such operations, the stranded conductor 1 is finally shaped so that the cross section becomes circular as shown in the figure. By repeatedly applying such compression, the stranded conductor is adjusted to the state shown in FIG. [0007] The above-described conventional stranded conductor straightening method and apparatus have the following problems to be solved. In any of the above cases, unless the compression is performed sufficiently effectively and the number of times of the compression is reduced as much as possible, there is a problem that the stranded conductor is excessively stretched or hardened by processing. [0008] Unless the cable is compressed exactly concentrically with respect to the axis of the cable, eccentricity or bending occurs at the compression connection portion. In addition, there is a problem that the straightening operation takes a relatively long time by any of the methods. In addition, there is a problem that the strand of the stranded conductor is damaged when compressed by the die. SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and a stranded wire capable of compressing and realigning a stranded wire conductor that has been separated at a cable terminal while suppressing damage and deterioration as efficiently as possible. It is an object of the present invention to provide a conductor terminal straightening device. [0010] A stranded wire conductor terminal straightening device of the present invention includes a pair of dies which surround the ends of the stranded wire conductors, compress the wires in the radial direction, and straighten them. Is provided with a semi-cylindrical main body part obtained by dividing a cylinder into two parts, and a comb-shaped part extending along the dividing line of the main body part so as to extend the main body part in the direction of movement of the dies. The comb-shaped portion surrounds the stranded wire conductor terminal, and is arranged so that the dies can approach each other and compress the stranded wire conductor terminal from the start of compression until the dies are compressed so as to maintain a meshing state with each other. It is a feature. In this apparatus, the ends of the stranded conductors are bundled and compressed using a pair of dies having a semi-cylindrical body. The comb-like portion sandwiches the stranded conductor between the pair of dies from a state where the interval between the pair of dies is sufficiently large, and prevents a part of the strand from protruding outside. Therefore, straightening is completed by compressing the dice several times while enlarging or reducing the interval between the dice while surrounding the stranded wire conductor with the main body portion and the comb-like portion of the pair of dies. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. FIG. 1 is a perspective view showing an embodiment of a stranded conductor straightening device according to the present invention. In the illustrated device, a cylinder 12 is vertically arranged on an upper portion of a frame 11. The cylinder 12 is operated by a hydraulic pump 13 so that the upper shaft 14 can be moved up and down in the direction of arrow 10. A die 15 is fixed to a lower end of the upper shaft 14. The die 15 has a semi-cylindrical main body 15.
A, and a comb-shaped portion 15B provided at a portion corresponding to a dividing line when the die is manufactured by dividing a cylinder. The comb-shaped portion 15B extends so as to extend the main body 15A in the moving direction of the die 15 exactly. That is, the comb-shaped portion 15B of the die 15 fixed to the upper shaft 14 is configured to extend vertically downward. On the other hand, a lower shaft 16 is disposed at a lower portion of the frame 11 in the figure, and a die 15 having the same configuration as the die 15 fixed to the upper shaft 14 is fixed to an upper end thereof. The lower shaft 16 is fixed to an end of an arm 17, which is supported by a bearing 18 provided on a leg of the frame 11,
It swings in the direction. As shown in the figure, the die 15 fixed to the upper shaft 14 and the die 15 fixed to the lower shaft 16 are arranged so that their comb-tooth-like portions 15B just mesh with each other. As shown in the figure, the apparatus having the above-described configuration carries out a process of holding the ends of the stranded conductor 1 from which the coating 2 has been removed, compressing the stranded conductor 1 collectively in the diameter reducing direction, and realigning. Next, the operation of the apparatus of the present invention will be described step by step. First, the upper shaft 14 shown in FIG.
Is lifted upward, and the arm 17 to which the lower shaft 16 is attached is further rotated in the direction of arrow 19 to open the lower side of the device. In this state, the stranded conductor 1 is sandwiched between the die 15 fixed to the upper shaft 14 and the die 15 fixed to the lower shaft 16. By rotating the arm 17 and returning the lower shaft 16 to a direction that is just vertical, that is, the state as shown in FIG. 1, the stranded conductor 1 is moved to the die 15 fixed to the upper shaft 14 and the lower shaft 16. It is surrounded by the fixed die 15. FIG. 4 is a diagram for explaining the operation of the apparatus of the present invention at the time of compression processing. When starting the compression of the stranded conductor with the apparatus of the present invention, as shown in FIG.
Is a main body 15A of a pair of dies 15 and a comb-shaped portion 1
5B. In this state, the upper shaft 14 shown in FIG.
5 approach each other. Thus, the stranded conductor 1 is compressed from the state shown in FIG. 4 having an oval cross section to the state shown in FIG. 4 which is a true circular cross section. In this case, since the comb-shaped portions 15B are engaged with each other, the strands of the stranded conductor 1 are not disturbed or protrude outward from the start of compression to the most compressed state. In addition, when sufficient straightening cannot be performed by one compression, the interval between the pair of dies 15 is increased again. Also in this case, the length of the comb tooth-shaped portion 15B is selected so as to always maintain the meshing state. Therefore, even if the state shown in FIG. 4 and the state shown in FIG. 4 are alternately repeated, the strand of the stranded conductor 1 is always sandwiched between the pair of dies 15. Therefore, for example, while the twisted wire conductor 1 is slightly rotated about its cable axis, the pair of dies 15 can be moved up and down to compress them, and an effective straightening operation can be performed. The present invention is not limited to the above embodiment. In the above embodiment, a hydraulic device was used to move the pair of dies closer or farther apart. However, this may be an electric shaft or crank or a manual one. In addition, the comb-shaped portion 15B
Any structure may be used as long as it can maintain the meshing state from the start of compression to the end of compression as described above, and a gap may exist between the comb teeth themselves. That is,
The comb-like portion 15B does not have to be a fixed band-like shape as shown in the figure, but may be, for example, a needle-like shape. Of course, the number, shape, etc. may be arbitrarily selected. The stranded wire conductor end straightening apparatus of the present invention described above is provided with a pair of dies which surround the ends of the stranded wire conductors, compress them in the radial direction, and straighten them. Has a semi-cylindrical body and a comb-shaped portion extending so as to extend in the direction of movement of the die, and the comb-shaped portion surrounds and meshes with each other from the start of compression until compression of the stranded conductor terminal. Since the arrangement is made so as to maintain the state, the work of compressing and straightening the stranded conductor is simplified. In addition, effective compression can be performed as compared with the case where compression is performed using a sleeve or the like, and straightening of the stranded conductor end can be performed with a smaller number of times of compression.
Further, when the stranded conductor is appropriately and repeatedly compressed, there is no possibility of damaging a part of the strand. Therefore, the apparatus according to the present invention facilitates the connection work of this kind of cable and can minimize the deterioration of the conductor and the like, so that the electrical and mechanical characteristics of the connection portion itself can be sufficiently improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a stranded conductor terminal straightening device of the present invention. FIG. 2 is an explanatory diagram showing a conventional stranded conductor terminal straightening method. FIG. 3 is an operation explanatory diagram showing a conventional stranded conductor terminal straightening device. FIG. 4 is an explanatory diagram showing a straightening operation of the device of the present invention. [Description of Signs] 1 Stranded wire conductor 11 Frame 12 Cylinder 13 Hydraulic pump 14 Upper shaft 15 Dice 15A Main body 15B Comb-like portion 16 Lower shaft

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01R 43/00 B21F 1/02

Claims (1)

(57) [Claims 1] A pair of dies for surrounding the end of the stranded wire conductor and compressing in a radially decreasing direction to straighten the pair of dies, wherein the pair of dies are formed by dividing a cylinder into two halves. A cylindrical main body, and a comb-shaped portion extending on the dividing line of the main body so as to extend the main body in the direction of movement of the dies. Surround the terminal,
A stranded wire conductor straightening device, wherein the dies are arranged so as to maintain a meshing state from each other until the dies approach each other and compress the stranded wire conductor from the start of compression.