JPH0337916A - Electric wire twisting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to an electric wire constituted by stranded wires such as an overhead ground wire, particularly an electric wire consisting of a high tensile strength wire and an @ wire,
Among these, it relates to a twisting method that is useful when applied to the production of optical fiber composite overhead ground wires (hereinafter referred to as 1'0PGW) and a twisting device used for that purpose. [Prior art] Recently, optical fibers have been Remarkable progress has been made in the technology used as transmission lines, and with the realization that the optical fiber is not subject to magnetic influences due to its material, 0PGW, which uses the above-mentioned overhead ground wire as a carrier and is attached to ultra-high voltage power transmission lines, is now widely put into practical use. It has come to be

Its typical structure is an aluminum pipe 1 as shown in Figure 2.
The optical fiber 13 is housed in 2 with or without a spacer, and the OP unit and the strands 11 of the overhead ground wire are twisted together so that the OP unit consists of 6 parts. It's more than that.

Since the material of the optical fiber is glass, its strength is much lower than that of the high tensile strength strands constituting the above-mentioned edge, and its elongation properties are also extremely low.

Moreover, if the optical fiber is quantitatively loaded with a tension that exceeds a predetermined critical value, even if the tension is small, static fatigue phenomenon caused by the static load peculiar to glass can be expected. It is known that the wire will break much earlier than the initial period.

To express this in concrete numbers, for example, when a 1% proof optical fiber is subjected to 0.33% stress, its lifespan is 30 years.
．． There is data that if placed under a stress state of 0.5% larger value, that is, 0.38%, the ligament will be severed within one year, that is, 322 days.Therefore, 0PGW! A: The optical fibers in the OP unit are loosely housed with a considerable amount of extra length so that even if they elongate due to constant load, the elongation will not be directly transmitted to the internal optical fibers.

However, as the specific cross-sectional view of 0PGWIO is shown in FIG. 2, 0PGWIO is a high tensile strength wire 11a with aluminum or copper coating 11b applied to the outer periphery of the wire 11a, and the cross section of the wire 11 is approximately fan-shaped.
There are many examples of twisted aluminum wires as shown in the figure, and compared to aluminum stranded wires used for ordinary power transmission lines,
The elastic modulus of the stranded wire is much larger, and therefore untwisting due to elastic deformation of the stranded wire diameter is highly likely to occur.

Such untwisting results in an increase in the length of the 0PGW after twisting. For this, the tl are twisted together.

The aluminum pipe of the OP unit was stretched, causing abnormal tension to the internal optical fiber, and the UI of the optical fiber was
There is a risk of a serious line accident.

Therefore, attempts have been made to reduce the untwisting of wires after the wires are twisted by twisting the wires using a wire twisting machine as shown in FIG.

That is, in FIG. 3, reference numeral 11 indicates the high tensile strength wires to be twisted, and the high tensile strength wires 11 are connected to the wire pressing device 2.
The high tensile strength strands 11 are sent out to the gathering plate 21 via the wire 0, passed through the presser roll 22, and are given a certain amount of plastic deformation in advance so as to be able to adapt to a predetermined twisting pitch so as to prevent the untwisting from occurring. Plastic deformation is applied by a preform device f23, and the wire is twisted together with the dummy core wire 12' by a twisting die 24.

However, in the case of the above-mentioned wire twisting device, it is not possible to completely eliminate untwisting only by applying the above-mentioned preform, and the untwisting caused by the twisting of the wires is further prevented by passing through the corrector 25 after twisting. To prevent. Straightening using the straightener 25 is extremely difficult work, and if it is carried out with the OP unit and γ-t twisted together, it may cause damage to the aluminum pipe or breakage of the optical fiber. As shown in Figure 3, a dummy twisted aIto' in which high tensile strength wires 11 are twisted is placed around the outer periphery of a dummy aluminum wire 12', and then a dummy twisted 1110' is made by a diffusion plate 26 as shown in No. 4 UfA. Untwist and remove 6 parts of the aluminum wire 12', and replace the aluminum wire 1112' with the OP unit 1.
2 as the core wire, and perform normal twisting with die 4' to create 0PGWIO with no risk of untwisting.
This is what I was getting.

[Problem to be solved by the invention 1 However, the above! ! ! ! By using all the methods, the untwisting of the strands will be reduced, and the 41 problems mentioned above will be eliminated! However, once a dummy stranded wire is produced, untwisting the stranded wire or replacing the core wire becomes a double effort, which takes time and requires many steps. As a result, there is a problem that the surface of the strands becomes rough especially when passing through the straightener 25, and there has been an increasing demand for a means for twisting wires that can achieve the same effect through a second process.

An object of the present invention is to solve the above-mentioned ran problems of the prior art, and to provide a method for twisting wires that does not cause untwisting without the need for severe work such as straightening using a straightener, and a device for the same. It is.

[Means for Solving the Five Problems] The present invention provides a method for each twist in a wire twisting machine. Before the strands pass through the collecting plate, each strand is preformed at a pitch shorter than the desired twisting pitch of the wires, and then when being twisted, the pitch of the preformed strands is adjusted to a longer pitch. The first gist is to twist the yarn to a desired twisting pitch by returning it,
As a device that makes this possible, a first holding device and a second holding device are installed in series at a predetermined interval to allow each main line to pass while suppressing its own twisting before reaching the collecting plate.
The presser device itself is in a fixed state, and the second presser device is rotated about the traveling direction of the strand and fixed so as to be fixed, and the second presser device is rotated and fixed to obtain the required rotation angle. The second method is configured such that a pre-selected preform can be applied in advance to the strands existing between the wire and the first holding device at a pitch shorter than the desired twisting pitch of the wire. The outline of The present invention is constructed to provide a particularly suitable wire twisting method and device.

[Operation] If one side of the wire texture is fixed and the other wire texture is fixed with a rotation angle of 1° before reaching tl to the collecting plate, and the wire is passed through in a twisted state, the magnitude of the rotation angle can be changed. The strands undergo plastic deformation and are preformed. If this strand is preformed slightly excessively, the desired twisting pitch will be achieved once by the subsequent untwisting, and no untwisting will occur even if the wire is twisted directly onto the OP unit.Therefore, the OP unit It becomes possible to directly use 0PGW as a core wire in a twisted wire and directly twist 0PGW in one step without the need for tammy twisting.

C Example J The present invention will be explained below with reference to Real R@...1.

FIG. 1 is an explanatory diagram showing how 0PGWIO is twisted by the method according to the present invention using the apparatus according to the present invention.

Reference numeral 11 denotes the strands constituting the stranded wire shown in FIG.
4M, ttb is an aluminum or copper coating layer coated on its outer periphery.

In the example shown in FIG. 2, each of the strands 11, 11 has a fan-shaped cross section, but having such a fan-shaped cross section creates a wedge effect between the strands 11, 11 after being twisted. internal O
This is to prevent the large 11!11 pressure from being applied to the aluminum pipe 12 of the P unit and causing the aluminum pipe 12 to deform.

In FIG. 1, reference numeral 3 denotes a collecting plate, which has the role of collecting the strands 11 and 11 pulled out from each bobbin, rotating them, and twisting them in the twisting die 4.

In the present invention, the first line pressing device 1 is
and 2nd I! Presser devices 2 are arranged in series in the direction of movement of the strands, and each line texture device has presser rolls 1a, 1a, and 2a as shown in the figure.

2a is provided, and when the bare att, especially the one with the fan-shaped cross section, passes through each line texture device 1 and 2, its M1 surface is pressed by the presser rolls 1a and 2a, which may cause twisting. configured to no state. However, the presser rolls 1a and 2a not only prevent twisting, but also prevent the material from twisting when passing through each roll.
It is also possible to serve the role of forming or preforming i.

The element R11゜11 fed out from the bobbin (not shown) is first held by the first presser! 1, and then the second presser device 2
and is collected on the collecting board.

In the above, the first presser device ff is in a fixed state,
The second holding device 2 can be rotated about the direction of movement of the wire 11 as an axis, and is configured to be able to be fixed at the rotation angle after being rotated appropriately.

As described above, if the second presser device is rotated to the required rotation angle for preforming the target wire and fixed at that position, the first presser device will be in the fixed state. Therefore, the strand 1] between the first and @2 holding devices is given a twist corresponding to the [1li11 rotation angle of the second holding device, and this twist causes it to be plastically deformed and becomes the element ff1ll. When a preform with a pitch shorter than the pitch of the stranded wire is given according to the twisting, the presser rolls 2a, 2a of the second presser device 2 also have the function of further fixing this preform.

The strands 11, 11, which have been given a preform with a predetermined pitch by twisting as described above by the first and second holding devices 1 and 2, pass through the collecting plate 3 and are directly connected to the OP unit 12 in the twisting die 4. They are twisted together as core wires, but during this twisting, the pitch of the preform, which was short 1El, is changed due to the return action from the second holding device to the twisting port and the ironing action by the die 4. The wire is twisted back by a certain amount to restore the desired pitch, and then twisted once at the desired twisting pitch. Therefore, OP G 'l/V only in the - process
The twisting of the IO wire is completed and no more untwisting occurs thereafter.

The amount of return of the preformed pitch described above largely depends on the strength of the steel wire 11a that presses the strand 11, and this is directly related to the elasticity of the steel wire 11a when preforming with the second holding device. If a large gA wire with a large return strength is used, it is necessary to preform with a strong twist, and if a steel wire with a low strength is used, an excessively strong twist must be applied. Conversely, when the wires are twisted in the opposite direction, the twist becomes tight.

The pitch at which the preform is applied and when the preform is twisted, the pitch of the preform returns to the desired twisting pitch can be easily determined by experiment, but the steel used as 0PGW In the case of wire, it is sufficient to make the bi-sochi of the preform given by the presser device have a pitch shorter than the desired twisting pitch in the range of 50 to 100%, and in this range of 50 to 100% @ It is only necessary to set the preform with an appropriate pitch depending on the strength of the 1ila, the number of strands, the material of the coating layer 1b, the coating thickness, etc. 5. The cross-sectional shape of the cable wire is not necessarily limited to a fan-shaped cross-section, and other cross-sectional shapes may be used, and the present invention can be applied to even a normal circular cross-section strand as long as it can be sufficiently pressed by the presser roll of the presser. It is possible to apply

Regarding the type of mIN, it is not necessary to target only 0PGW, and the present invention can be applied to twisting of twisted wires in which untwisting after twisting is undesirable.

[Effects of the Invention] As detailed above, the present invention, by applying this particularly to 0PGW, can achieve the same effect in one step as opposed to conventionally preventing untwisting in two steps. By being able to reduce the number of man-hours by a large amount, it not only saves time and money, but also eliminates the process of forcing the orthodontist through the conventional method.
Improving quality by improving quality (J=r
Becomes Noh.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing how the f-based m-ray method of the present invention is implemented using the apparatus according to the present invention, and FIG. 2 is an 0PGW
FIG. 3 is an explanatory diagram showing how tummy wires are twisted together by a conventional twisting device, and FIG. 4 is an explanatory diagram showing how the dummy wire and OP unit are replaced. . 1: 1st #I holding device, 2: 2nd wire holding device, 3: Collecting board, 4: Twisting die, 10: 0J) GW, 11: Twisting cable wire, 12: 0. P unit] (pipe), 1: Optical fiber.

Claims (3)

[Claims] (1) In the twisting machine, each twisted wire is fed into the twisting die via the collecting plate and twisted around the outer periphery of the center line.
Before the stranded strands pass through the collecting plate, each strand is preformed at a pitch shorter than the desired twisting pitch of the wire, and then when being twisted, the pitch of the preformed strands is slightly adjusted. A method of twisting electric wires in which the wires are twisted to a desired twisting pitch by returning the wires to long lengths. (2) The OP unit according to claim 1, wherein the twisted wires are aluminum or copper-coated steel wires having an irregularly shaped cross section such as a fan-shaped cross section, and the center line is an OP unit in which the optical fiber is housed in an aluminum pipe. Stranding method. (3) A first holding device and a second holding device are installed in series at a predetermined interval to allow each strand to pass through while suppressing its own twist before reaching the collecting plate, and the first holding device itself in a fixed state, the second presser device is configured to be able to rotate and fix around the traveling direction of the strands, and by rotating and fixing the second presser device and setting the required rotation angle. A wire twisting device configured to be able to apply pre-selected preforms at a pitch shorter than a desired twisting pitch of the electric wires to the wires existing between the wires and the first holding device.