JPH064945B2 - Concentric stranded wire making machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a manufacturing machine for concentric stranded wires used for power transmission lines, etc. It can be manufactured at the same time.

[Conventional technology]

FIG. 10 shows a concentric stranded wire manufacturing machine disclosed in Japanese Patent No. 1260214, (a) is a longitudinal sectional view, and (b) is A-A of (a).
FIG.

The concentric stranded wire manufacturing machine 21 is provided with an annular groove 23 on the outer circumference of a rotary head 22 driven by a power source (not shown), and slides an inner convex portion 27 of a fixed shoe 26 on the annular groove 23. It is fitted so that it can be contacted with each other, and is formed in a shape in which the cross-sectional area of the annular groove 23 is gradually reduced. It is characterized in that it is formed by penetrating the core wire delivery hole 25.

In the figure, reference numeral 28 denotes a material guide roll, and a long material (not shown) is supplied from the material inlet 29 into the annular groove 23 as the rotary head 22 rotates (direction B),
While passing through the annular groove 23, it is compressed and extruded from a plurality of extrusion dies 24 as outer layer strands (not shown).
Then, the outer layer element wire is twisted around a center element wire (not shown) delivered from the core wire delivery hole 25 by a twisting die not shown to form a concentric stranded wire.

FIG. 11 shows a concentric stranded wire manufacturing machine disclosed in JP-A-63-274033. (A) is a longitudinal sectional view, (b) is B of (a).
It is a -B sectional view.

The concentric stranded wire manufacturing machine 30 has a rotary head 31 driven by a power unit (not shown), which is provided with an annular groove 32 on the outer periphery of its tip 31a and a plurality of extrusion dies 33 communicating with the annular groove 32. A core wire delivery hole 34 is provided at the center of the rotary head 31, an annular movable shoe 35 is eccentrically provided with respect to the annular groove 32, and an inner convex portion 36 of the movable shoe 35 is slidably contacted. It is characterized by being freely fitted.

Here, the rotary head 31 is supported by a housing 37 via a bearing 38, and the movable shoe 35 is also supported by the housing 37.
Is eccentrically and rotatably supported by the rotary head 31 via a bearing 39. Then, the rotary head 31
The material passage 40 formed between the annular groove 32 and the inner convex portion 36 of the movable shoe 35 gradually decreases in cross-sectional area as the rotary head 31 rotates, so that the material passage 40 is inserted. The long material (not shown) is gradually compressed,
In the vicinity of the maximum compression point 40a, it is sequentially extruded from the extrusion die 33 as an outer layer wire. At the same time, the core wire is supplied from the core wire delivery hole 34 of the rotary head 31, and the outer layer wire is twisted around the center wire to complete the concentric stranded wire.

However, these conventional concentric stranded wire manufacturing machines 21, 30
In that case, it was necessary to separately prepare a central wire. That is, since the center strand is supplied from the core wire delivery holes 25 and 34 of the rotary heads 22 and 31 to the outer layer strand that is molded and extruded by the extrusion dies 24 and 33, the center strand is supplied. Since a dedicated feeding device (not shown) and the like must be provided, there were problems in terms of cost and enlargement of the stranded wire manufacturing machine.

[Problems to be Solved by the Invention]

The present invention has been made in view of the above points, and an object thereof is to provide a concentric twisted wire manufacturing machine that does not require the separate preparation of a center wire.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a rotary head with an annular groove and a plurality of extrusion dies communicating with the annular groove, and the cross-sectional area of the annular groove is gradually increased with respect to the annular groove. In a twisted wire manufacturing machine, in which a ring-shaped shoe to be reduced is slidably fitted, a material is supplied into the ring-shaped groove, and the strands are extruded and twisted from the extrusion die, one of the plurality of extrusion dies. A means for increasing the extrusion resistance of the strand is taken with respect to the extrusion die, and the extrusion speed of the core strand extruded from the one extrusion die is changed to the velocity of the outer layer strand extruded from the other extrusion die. It is characterized by being slower than.

[Work]

Since a means for increasing the extrusion resistance of the strand is taken for one of the multiple extrusion dies, the extrusion speed of the core strand is slower than that of the outer strand strand, and a twisting margin is required. It is possible to set the center strand to be shorter than the outer layer strand. Therefore, it is possible to simultaneously obtain the center wire and the outer layer wire from the same material with less equipment.

〔Example〕

FIG. 1 shows that the core wire feeding holes 25 and 34 are omitted from the rotary heads 22 and 31 of the concentric stranding machines 21 and 30 shown in the related art (FIGS. 10 to 11) and the extrusion is performed. 1 shows a rotary head 4 according to the present invention in which a core wire extrusion die 3 is provided together on a pitch circle 2 of a die 1 (corresponding to 24 and 33 in FIGS. 10 to 11). In the figure,
1 shows a rotary head 4 for producing a seven-core concentric stranded wire,
One core wire extrusion die 3 for six outer layer wire extrusion dies 1
Are installed.

FIG. 2 shows an essential part of a concentric stranding machine according to the present invention using the rotary head 4 shown in FIG.

In the figure, 4 denotes the rotary head, 5 denotes a wire guide which rotates in synchronization with the rotary head 4, and 6 denotes a concentric guide which also rotates in synchronization with the rotary head 4. The wire guide 5 is provided with seven guide holes 7 corresponding to the six outer layer wire extrusion dies 1 and one core wire extrusion die 3 of the rotary head 4 in the same pitch circle. The pitch circle of the guide hole 7 is set smaller than the pitch circle 2 of the extrusion die 1 of the rotary head 4. Further, the concentric guide 6 is provided with one core wire insertion hole 8 at the center thereof, and six outer layer wire insertion holes 9 are equally arranged around the core wire insertion hole 8 and the guide holes 7 are provided. The pitch circle is smaller than the pitch circle of.

The center wire 10 sent out from the core wire extrusion die 3 of the rotary head 4 passes through the guide hole 7 of the wire wire guide 5 and the core wire insertion hole 8 of the concentric guide 6, and then the twisting die 1
Guided to 1. The twisting die 11 twists the outer layer wire 12 and the center wire 10 fed from the concentric guide 6 that rotates in synchronization with the rotary head 4 and finally concentric as shown in FIG. It is for forming the stranded wire 13.

In the structure of the concentric stranding machine described above, the extrusion speed of the center wire 10 is set to be slower than the extrusion speed of the outer layer wire 12. That is, as shown in FIG. 4 (a), in which the center line 10a of the concentric stranded wire 13 and the outer layer wire 12a are twisted together, the center line 10a is formed in order to twist the outer layer wire 12a around the center line 10a. Since there is no twisting margin, it must be set shorter than the outer layer wire 12a.

FIG. 4 (b) shows the respective dimensional relationships, L ₁ is the length of one pitch of the center line 10a, and L ₂ is
One pitch length of the outer layer wire 12a, L _3, is the outer layer wire 12a
Is the length of the pitch circle 14. Where L ₁ ,
Since L ₂ and L ₃ are represented by a right triangle, If the diameter of the outer layer wire 12a = the diameter of the center wire 10a = D, then L
₃ = 2πD, where L ₁ = 30D is usually specified, so that L ₁ / L ₂ ≈0.977, and the center line 10a is about 2 to 3% shorter than the outer layer line 12a.

Therefore, it is necessary to set the extrusion speed of the center wire 10 to be lower than the extrusion speed of the outer layer wire 12, and therefore, in the present invention, the core wire extrusion die 3 is
Measures are taken to increase the extrusion resistance of the center wire 10.

5 to 7 and 9 show an embodiment of the means, and FIG. 8 shows the structure of a conventional (FIG. 10) extrusion die 24 for comparison. That is, these are the annular grooves 23, 3 shown in the prior art (FIG. 10 or FIG. 11).
3 shows a core wire extrusion die 3 that communicates with the annular groove 15 of the rotary head 4 similar to that in FIG.

FIG. 5 shows that the core wire extrusion die 3 is positioned in the intermediate portion of the communication hole 16 with respect to the annular groove 15 of the rotary head 4 so that the resistance of the material pressure-fed in the direction of the arrow A is increased in the communication hole 16. This is a means for increasing the speed to slow down the extrusion speed of the core wire 10.

FIG. 6 shows that immediately before the core wire extrusion die 3, the core wire extrusion die 3 is
A spacer 18 having an orifice 17 having a diameter smaller than the inlet diameter of is used to increase the extrusion resistance of the material.

In FIG. 7, a cooling pipe 19 is embedded near the core wire extrusion die 3 (rotary head 4) to cool the material to increase the deformation resistance of the material and slow the extrusion speed.

Further, FIG. 9 shows the orifice 20 of the core wire extrusion die 3a.
The cross-sectional shape of the inner surface is a non-circular concavo-convex shape 20a, and the molding resistance of the center wire 10 is increased.

〔The invention's effect〕

As described above, according to the present invention, for one extrusion die among a plurality of extrusion dies, means for increasing the extrusion resistance of the strand is taken, and the central element extruded from the one extrusion die. Since the extrusion speed of the wire is made slower than the speed of the outer layer wire extruded from other extrusion dies, it is necessary to prepare a separate center wire as in the past, or It is not necessary to provide a feeder or the like, and therefore, the manufacturing cost can be reduced and the concentric stranded wire manufacturing machine itself can be made compact.

[Brief description of drawings]

FIG. 1 is a front view showing a rotary head according to the present invention, FIG. 2 is a perspective view of a main part of a concentric stranded wire manufacturing machine of the present invention, FIG. 3 is a sectional view of the concentric stranded wire, and FIG. b) is an explanatory view of the concentric stranded wire, FIGS. 5 to 7 and 9 are sectional views in the vicinity of the extrusion die showing the extrusion speed delay means of the core wire in the present invention, and FIG. 8 is a conventional extrusion. Sectional view of the vicinity of the die, FIG. 10 shows a conventional example, (a) is a longitudinal sectional view, (b) is a sectional view taken along the line AA of (a), and FIG. 11 is another conventional example. ) Is a vertical sectional view, (b) is
It is a BB sectional view of (a). 1 ... Outer layer wire extrusion die, 3 ... Core wire extrusion die, 4, 22, 3
1 ... rotary head, 10 ... center wire, 10a ... center line,
12 ... outer layer wire, 12a ... outer layer wire, 13 ... concentric stranded wire,
15 ... Annular groove, 16 ... Communication hole, 17 ... Orifice, 19
... cooling pipe, 20a ... uneven shape, 23, 32 ... annular groove, 24, 33 ... extrusion die, 25 ... core wire delivery hole, 26 ...
Fixed shoe, 35 ... Movable shoe.

Claims (1)

[Claims] 1. A rotary head is provided with an annular groove and a plurality of extrusion dies communicating with the annular groove, and an annular shoe for gradually reducing the cross-sectional area of the annular groove is slidably contacted with the annular groove. In a twisted wire manufacturing machine that fits as much as possible, supplies a material into the annular groove, and extrudes strands from the extrusion die to twist the strands, By taking measures to increase the extrusion resistance of the wire, the extrusion speed of the core wire extruded from the one extrusion die is
A concentric stranded wire manufacturing machine, which is slower than the speed of the outer layer strand extruded from another extrusion die.