JPH10112225A - Cable with double-twisted wire sheathing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a twist from occurring on a cable having a double-twisted wire sheathing and delivered through a sheave. SOLUTION: A right-twisted inside twisted wire 4 made of a synthetic resin strand 3 is provided on the outer periphery of the cable main body 2 of a cable 11 having a double-twisted wire sheathing, and a left-twisted outside twisted wire 6 made of a synthetic resin strand 5 is provided on its outer periphery. The inside twisted wire 4 and the outside twisted wire 6 are connected together by an adhesive 22 in the cable longitudinal direction at one position in the cable peripheral direction. In this cable 11 having a double-twisted wire sheathing, the synthetic resin strands 3, 5 of the inside and outside twisted wires 4, 6 are fixed each other for each pitch of twisting. Mutual movement between the inside and outside twisted wires 4, 6 necessary for a bend at a sheave is allowed, however mutual movement between the inside and outside twisted wires 4, 6 causing a twist of the cable 11 is not allowed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable having a double stranded wire sheath in which a synthetic resin stranded wire is provided double in an inner and outer reverse twist around an outer periphery of a cable body.

[0002]

2. Description of the Related Art As a cable having the above-described double stranded wire sheath, for example, there is a cable connected to an unmanned spacecraft (underwater robot) used in the sea. This unmanned spacecraft cable (called a spacecraft cable) uses a composite cable that combines electric wires and optical fibers for power supply and data transmission, but it also uses an unmanned spacecraft (hereinafter called a spacecraft). The composite cable is provided with a stranded wire made of synthetic resin around the composite cable in order to have a role as a tensile strength member for lifting the cable. Since it is desirable that the spacecraft cable be lightweight so as not to hinder the movement of the spacecraft in the sea, usually, Kevlar FRP (Kevlar (trademark)) is used as a strand material of the synthetic resin stranded wire. Fiber reinforced plastic). The synthetic resin stranded wires are provided in two layers on the outer periphery of a cable body (the above-described composite cable) 2 as shown in FIGS. That is, for example, the inner stranded wire 4 is left-twisted, and the outer stranded wire 6 is right-twisted thereon. In FIG. 10, L ₁ indicates the twist pitch of the synthetic resin strand 3 forming the inner stranded wire 4, and L ₂ indicates the twist pitch of the synthetic resin strand 5 forming the outer stranded wire 6. However, in FIG. 10, half of the pitch (1 / 2L ₁ , 1 / 2L
₂ ) is clearly stated. The twist pitch is the length in the cable longitudinal direction in which the twist spiral makes one round.

The above-mentioned spacecraft is suspended in the sea by a spacecraft cable which is fed out of the spacecraft through a sheave through a sheave. If a cable is used, the spacecraft cable rotates when the spacecraft cable is fed out through the sheave. In the helical twist direction as described above, the cable rotates counterclockwise when the cable is fed, and clockwise when the cable is wound. The cause of this rotation is considered to be that the synthetic resin stranded wire of the probe cable has a double stranded structure as described above. Therefore, when the propeller of the probe is moved so as to prevent the probe from rotating with the rotation of the probe cable, twisting occurs in the probe cable. For this reason, conventionally, when designing and manufacturing the stranded wires of the cable for the spacecraft, the designing and manufacturing have been performed so that the balance between the inner and outer stranded wires is appropriate.

In other words, the inner stranded wire 4 is twisted in the left direction and the outer stranded wire 6 is twisted in the opposite direction to the right twist so that the torque can be balanced, and the number and pitch are calculated and wound. Then, we performed a hanging test on land and confirmed that the torque was almost balanced before shipping. As for the equipment on the side of the spacecraft, the fleet angle (the angle of entry of the spacecraft cable with respect to the plane of the sheave) when the spacecraft cable is wound around the sheave is set to 0 (zero).

[0005]

However, a certain effect can be obtained even if the design and manufacturing are considered to be appropriate by taking various considerations based on the viewpoint of torque balance as described above, but a certain effect can be obtained. However, it was impossible to completely solve the problem that twisting occurred in the cable for the spacecraft and the twist was distributed. Since the twisted probe cable cannot be wound on the drum on the ship as it is, when the probe is lifted, the probe is hung by a crane and the probe is rotated freely to eliminate the cable twist, A complicated cable twisting work was required on board, such as removing the connector at the connection with the cable and turning the spacecraft cable to eliminate the cable twisting.

As described above, the phenomenon that the rotation direction of the cable tip is reversed between the time when the cable is extended and the time when the cable is wound is because the torque balance of the cable is out of order or the fleet angle of the sheave on the ship is large. I can't explain. Therefore, in order to eliminate the twist, the present inventors have paid attention to the fact that the twist of the cable is generated when the cable enters and exits the sheave, and conducted experiments with various proposals. From such studies, the present inventors presumed the cause as follows. In other words, no matter how well balanced the cable is, when the cable passes through the sheave under strong tension, the cable is "struck". It is estimated that this phenomenon of squeezing causes a mutual displacement in the longitudinal direction of the cable between the outer stranded wire and the inner stranded wire, and this displacement contributes to applying a rotational force to the cable. By analogy, wearing a jacket (outer stranded wire) on a shirt (inner stranded wire) and rubbing the sleeve of the jacket in the longitudinal direction, only the sleeve of the jacket is dragged by hand, It protrudes greatly from the sleeve of the jacket. When this is applied to the cable, when the cable is extended, as shown in FIG. 12A, on the downstream side (lower left side in the figure) of the sheave 7, the tension distribution of the outer stranded wire 6 increases and the inner stranded wire 4 On the other hand, a shift occurs in the longitudinal direction of the cable, and a right rotation torque is generated with the shift. That is, even if the cable has a proper torque balance, immediately after passing through the sheave 7, the outer stranded wire 6 is in a shortage state, which can be a force for rotating clockwise. In addition,
On the upstream side of the sheave 7 (upper right side in the figure), due to the delay of the progress of the outer stranded wire due to the detachment, the cable does not rotate, but generates a counterclockwise torque. On the other hand, at the time of winding the cable, as shown in FIG. 12B, on the upstream side of the sheave 7 (the lower left side in the figure), the tension sharing of the outer stranded wire 6 is reduced and the inner stranded wire 4 On the other hand, a shift occurs in the longitudinal direction of the cable, and a left rotation torque is generated in accordance with the shift. On the downstream side of the sheave 7 (upper right side in the figure), the cable 1 does not rotate, but generates a clockwise rotation torque. On the desk, the rotational force (that is, torsion) should be canceled by one reciprocation of the feeding and rewinding, but actually, a slight displacement remains, and thus remains in the cable 1 as a distribution of torsion. It seems to end up. Based on the above considerations, the present inventors, in order to suppress twisting (generation of rotational force) of the cable, adjust the longitudinal displacement between the inner stranded wire 4 and the outer stranded wire 6. I found that it was better to suppress it. However, if the longitudinal displacement between the inner stranded wire 4 and the outer stranded wire 6 is suppressed over the entire length and the entire circumference of the cable, the cable 1 will not bend. Therefore, various means for eliminating the displacement between the inner and outer stranded wires without impairing the flexibility of the cable 1 were studied.

SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and has an armor made of an inner stranded wire and an outer stranded wire which are twisted in opposite directions, and feeds and winds a cable passing through a sheave. It is an object of the present invention to provide a cable having a new double-stranded wire sheath that does not cause twisting of the cable when the cable is twisted.

[0008]

According to a first aspect of the present invention, there is provided a double stranded wire sheathing in which a synthetic resin stranded wire is provided on the outer periphery of a cable body in a double inner and outer reverse twist. The inner stranded wire and the outer stranded wire are joined to each other over the entire circumference in the cable circumferential direction at appropriate intervals in the cable longitudinal direction.

The invention according to claim 2 is characterized in that the inner stranded wire and the outer stranded wire are joined to each other at one position in the circumferential direction of the cable in the longitudinal direction of the cable.

According to a third aspect of the present invention, a sheet which is plastically deformed by heat is inserted between an inner stranded wire and an outer stranded wire, and the inner stranded wire and the inner stranded wire are heated from the outside to form a sheet on both sides of the sheet. It is characterized in that a twist groove is formed by an outer twist wire.

[0011]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIGS. FIG. 1 is a partially cutaway front view showing an embodiment of a cable having a double stranded wire sheath of claim 1, and FIG. 2 is an enlarged sectional view taken along line AA in FIG. The cable 11 having the double stranded wire sheath is a cable for an unmanned spacecraft described in the description of the conventional example,
The cable body 2 is a composite cable in which an electric wire and an optical fiber are combined for power supply and data transmission. The cable (probe cable) 11 having the double stranded wire sheath is attached to the outer periphery of the cable body 2 by Kevlar FR.
P: an inner twisted wire 4 formed by twisting a synthetic resin wire 3 made of P to the left, and a synthetic resin wire 5 also made of Kevlar FRP
And an outer stranded wire 6 which is right-twisted in the opposite manner to the above. The configuration described above is the same as the conventional spacecraft cable 1 shown in FIGS. 10 and 11, except that the cable 11 having the double stranded sheath has an inner stranded wire 4 and an outer stranded wire 6, and a cable At appropriate intervals in the longitudinal direction, they are joined to each other over the entire circumference in the circumferential direction of the cable.

In the illustrated example, the inner stranded wire 4 and the outer stranded wire 6 are bonded to each other by an elastic adhesive 12 at a position of an integer multiple of the twist pitch of the synthetic resin strands 3 and 5 within a range of a width a. They are joined along the entire circumference. Incidentally, it illustrated example, twisting pitch L of the pitch L ₁ and the outer twisted wire 6 twisted inside the twisted wire 4
_This is the case where ₂ is made equal.

A cable 11 having the above-mentioned double stranded wire sheath
According to the method, the inner stranded wire 4 and the outer stranded wire 6 are fixed to each other at every integral multiple of the twist pitch, so that the mutual displacement in the longitudinal direction between the inner and outer stranded wire layers remains within one pitch of the twist. , The deviation does not accumulate. Therefore, the mutual movement in the longitudinal direction between the inner and outer stranded wire layers when being bent along the sheave is allowed, but the movement until the twist or undulation is not allowed. This situation will be described with reference to FIG. 5. In the figure, the pitch between the A position and the B position is one pitch of the twist. At the A position and the B position, the inner and outer stranded wires 4 and 6 are fixed to each other, and the inner and outer stranded wires are fixed. There is no longitudinal mutual movement between the lines 4,6. However, in the region between the position A and the position B, the mutual movement of the inner and outer stranded wires 4 and 6 is allowed. That is, mutual movement between the inner and outer stranded wires necessary to bend along the sheave 7 is allowed. In FIG. 5, R represents the radius of the sheave 7, r represents the cable radius, l represents the length of the synthetic resin wires 3 and 5 during one pitch of twist, and θ represents the twist direction.

In the above description, the twisted pitches L ₁ and L ₂ of the inner stranded wire 4 and the outer stranded wire 6 are assumed to be equal.
Normally, the twist pitches L ₁ and L ₂ of the inner and outer twisted wires 4 and 6 are different from each other due to the torque balance. When the twist pitches L ₁ and L _{2 of the} inner and outer stranded wires 4 and 6 are different from each other,
The joining interval between the inner and outer stranded wires 4 and 6 is the twist pitch L ₁ of both stranded wires,
The interval of the least common multiple of L _2. However, the inner and outer stranded wires 4,
6 may not necessarily be an integral multiple of the twist pitch.

FIGS. 3 and 4 show a cable 21 having a double stranded wire sheath according to an embodiment of the present invention. The cable 21 having the double stranded wire sheath, the cable body 2, the inner stranded wire 4 made of the synthetic resin wire 3, the outer stranded wire 6 made of the synthetic resin wire 5, and the like themselves are shown in FIGS. The configuration is the same as that shown. However, in the cable 21 having the double stranded wire sheath, the inner stranded wire 4 and the outer stranded wire 6 are connected at one location in the cable circumferential direction, for example, 5 to 7 m.
They are joined to each other by an adhesive 22 having elasticity over the entire length in the longitudinal direction of the cable with a width b of about m.

According to this configuration, the synthetic resin strands 3 and 5 of the inner and outer stranded wires 4 and 6 are always fixed to each other at every twist pitch. Therefore, as described above with reference to FIGS. 5A and 5B, the mutual movement in the longitudinal direction between the inner and outer stranded wires 4 and 6 necessary for bending at the sheave 7 is permitted, but the twisting is performed. Movement up to the swell is not allowed. In addition, the cable 21 having the double-stranded wire sheath having this configuration can be easily manufactured because it is necessary to uniformly join the cable 21 at one location in the cable circumferential direction in the cable longitudinal direction. In addition,
Bonding between the inner and outer stranded wires 4 and 6 with an adhesive is preferably performed over the entire length of the cable, but this does not exclude that the connecting portion is interrupted.

FIG. 6 to FIG. 9 show a cable 31 having a double-stranded wire sheath according to an embodiment of the present invention (the one in the middle of the manufacturing process is indicated by 31 '). The cable having the double stranded wire sheath also has a cable body 2, an inner stranded wire 4 using a synthetic resin wire 3, and an outer stranded wire 6 using a synthetic resin wire 5.
Are the same as those shown in FIGS. 10 and 11, but in the cable 31 having the double stranded wire sheath, plastic deformation occurs between the inner stranded wire 4 and the outer stranded wire 6 due to heat. The sheet 32 is interposed. FIG. 6 is a partially cutaway front view of the cable 31 ′ having the double stranded wire sheath in the middle of the process of manufacturing the cable 31 having the double stranded wire sheath of this embodiment (the stage before the heat treatment described later). , FIG.
(A) is a cross-sectional view taken along the line CC of FIG. 6, and FIG. 8 is a view showing a vertical cross section of a main part of FIG. 6 above a center line. As shown in FIGS. 6 to 8, a sheet 32 which is plastically deformed by heat is interposed between the inner stranded wire 4 and the outer stranded wire 6.
When 1 'is heat-treated from the outside, spiral twist grooves 32a and 32b are formed on both surfaces of the sheet 32 as impressions of the inner and outer stranded wires 4 and 6, as shown in FIG.

In the cable 31 having the double stranded wire sheath, the synthetic resin strands 3 and 5 of the inner stranded wire 4 and the outer stranded wire 6 are twisted in the twist direction along the twist grooves 32a and 32b of the sheet 32. Is allowed, but movement in the cable longitudinal direction (cable axial direction) is not allowed. That is, the mutual movement between the inner and outer stranded wires 4 and 6 necessary to bend along the sheave 7 is allowed, but the movement in the longitudinal direction of the cable such as torsion or undulation is not allowed. The sheet 32 interposed between the inner stranded wire 4 and the outer stranded wire 6 is not provided on the entire cable circumferential direction as shown in FIG. A plurality of sheet-like sheets 32 'may be vertically attached at intervals in the circumferential direction of the cable.

Although Kevlar FRP is used as the synthetic resin wires 3 and 5 in the above embodiment, wires made of other synthetic resins can be used if the strength and the like are adapted to the intended use. .

The cable having the double-stranded wire sheath of the present invention is not limited to the probe cable as in the embodiment, but may be a cabtire cable, an elevator cable, or any other cable using synthetic resin strands. The present invention can be applied to a cable having various types of double-stranded wire sheaths that have a twisted inner and outer double twisted wire sheath and are fed and wound through a sheave during use.

[0021]

According to the cable having the double stranded wire sheath of the present invention, the occurrence of twisting of the cable when the cable is fed or wound through the sheave is greatly reduced or completely eliminated without impairing the flexibility of the cable. It can be. Thereby, the occurrence of kink of the cable can be prevented. In addition, the inconvenience of undulation and bumps on the cable can be eliminated. Further, the complicated twisting work on the ship, which was conventionally required for removing the twisting of the cable, is not required, and the work efficiency on the ship is remarkably improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a cable having a double stranded wire sheath according to the invention of claim 1;

FIG. 2 is an enlarged cross-sectional view taken along the line AA in FIG.

FIG. 3 is a partially cutaway front view showing an embodiment of a cable having a double stranded wire sheath according to the invention of claim 2;

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a view for explaining the operation of the cable having the double stranded wire sheath according to the first and second aspects of the invention.

FIG. 6 is a partially cutaway front view of a cable having a double stranded wire sheath in a middle stage of a process of manufacturing a cable having a double stranded wire sheath according to an embodiment of the present invention (a stage before heat treatment). FIG.

7A is a cross-sectional view taken along line CC of FIG. 6, and FIG. 7B is a cross-sectional view taken along line CC of a modification.

FIG. 8 is a vertical sectional view of a portion above a center line of a main part in FIG. 6;

9 shows a cable having a double-stranded wire sheath of a final product obtained by heat-treating a cable having a double-stranded wire sheath in the intermediate step shown in FIGS. 6 to 8, and corresponds to FIG. FIG.

FIG. 10 is a partially cutaway front view of a conventional cable having a double stranded wire sheath.

FIG. 11 is a sectional view taken along line DD of FIG. 10;

12A and 12B are diagrams illustrating a problem when a conventional cable having a double-stranded wire sheath is used, wherein FIG. 12A illustrates a situation when the cable is extended, and FIG. 12B illustrates a situation when the cable is wound. FIG.

[Explanation of symbols]

Reference Signs List 2 Cable body (probe cable) 3 Synthetic resin strand constituting inner stranded wire 4 Inner strand 5 Synthetic resin strand constituting outer stranded wire 6 Outer stranded wire 7 Sheave 11, 21, 31 double Cable with stranded wire sheath (cable for submarine exploration machine) 12,22 Adhesive 32 Sheet plastically deformed by heat

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Norio Kadomoto 5-6-4 Tsukiji, Chuo-ku, Tokyo Mitsui Engineering & Shipbuilding Co., Ltd. (72) Inventor Yasunori Nishida 3-1-1 Tamama, Tamano-shi, Okayama Prefecture No. Mitsui Engineering & Shipbuilding Co., Ltd. Tamano Plant (72) Inventor Kiichi Kaneko 9-1, Futaba-cho, Numazu-shi, Shizuoka Prefecture Inside Fujikura Numazu Plant (72) Inventor Masahiro Shinozaki 9-1, Futaba-cho, Numazu-shi, Shizuoka Stock Fujikura Numazu Plant (72) Inventor Haruhiko Tsuboi 9-1 Futaba-cho, Numazu City, Shizuoka Prefecture Fujikura Numazu Plant (72) Inventor Masahiro Iwasaki 9-1 Futaba-cho, Numazu City, Shizuoka Prefecture Zikura Numazu Plant

Claims (3)

[Claims] 1. A cable having a double-stranded outer sheath in which a synthetic resin-made twisted wire is double-laid inside and outside on the outer periphery of a cable body, wherein the inner twisted wire and the outer twisted wire are connected to each other. Characterized by being joined to each other over the entire circumference in the circumferential direction of the cable at appropriate intervals in the longitudinal direction of the cable. 2. A cable having a double-stranded outer sheath in which a synthetic resin stranded wire is provided twice in an inner and outer reverse twist around an outer periphery of a cable body, wherein an inner stranded wire and an outer stranded wire are provided. Characterized by being joined to each other in one direction in the circumferential direction of the cable in the longitudinal direction of the cable. 3. A cable having a double stranded outer sheath in which a synthetic resin stranded wire is provided twice in an inner and outer reverse twist around an outer periphery of a cable main body, wherein an inner stranded wire and an outer stranded wire are provided. Characterized in that a twist-formed groove formed by an inner stranded wire and an outer stranded wire is formed on both sides of the sheet by inserting a sheet which is plastically deformed by heat and heating the sheet from the outside. Cable with wire sheath.