CN111886660B

CN111886660B - Wire twisting device and method for manufacturing twisted wire

Info

Publication number: CN111886660B
Application number: CN201980019448.9A
Authority: CN
Inventors: 榎本纯也; 白井浩昭; 物延孝幸; 藤泽直树; 高井绚子; 冈田守弘
Original assignee: Shinmaywa Industries Ltd
Current assignee: Shinmaywa Industries Ltd
Priority date: 2018-03-26
Filing date: 2019-02-26
Publication date: 2021-11-05
Anticipated expiration: 2039-02-26
Also published as: JP2019169431A; WO2019187900A1; CN111886660A; EP3780020A1; EP3780020A4; EP3780020B1; MA52237A; JP6916137B2

Abstract

The invention aims to enable wires to be twisted well even if relatively long wires are twisted, and enable the wires to fall downwards and be recovered after twisting without stretching the wires with large force. The wire twisting device (1) is provided with: a first clamp (11) and a second clamp (12) which respectively hold one end and the other end of a first electric wire (51) and a second electric wire (52); a motor (13) that rotates the first chuck (11) about a rotation Center Line (CL); and an electric wire support member (31) which is configured to be movable between an electric wire support position, which is a position below the rotation Center Line (CL), and a retracted position, which is a position offset from below the rotation Center Line (CL), between the first jig (11) and the second jig (12), and which is configured to support the first electric wire (51) and the second electric wire (52) when the electric wire support member is located at the electric wire support position.

Description

Wire twisting device and method for manufacturing twisted wire

Technical Field

The present invention relates to an electric wire twisting device for twisting a plurality of electric wires and a method for manufacturing a twisted electric wire.

Background

There is conventionally known an electric wire twisting device including a pair of clamps (Clamp) for gripping one end portion and the other end portion of a plurality of electric wires, respectively, and twisting the plurality of electric wires by rotating at least one of the clamps. For example, patent document 1 describes an electric wire twisting device including a front rotating jig and a rear rotating jig which grip front end portions and rear end portions of two electric wires, respectively, and twisting the two electric wires by rotating the front rotating jig and the rear rotating jig in opposite directions to each other.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2017-10769

Disclosure of Invention

Technical problem to be solved

In addition, if the electric wire is long, the self weight is large. The long electric wires are easily bent downward when held by the two clamps. Further, since the bent portion is offset from the rotation center line of the jig, when the jig is rotated for twisting, a centrifugal force is likely to be generated in the bent portion. Therefore, if the amount of deflection of the wire is large, the wire vibrates greatly when the jig is rotated, and a problem occurs in that twisting cannot be performed satisfactorily, such as a variation in the twisting pitch.

Therefore, in order to make the wire less likely to be bent, it is considered to pull the wire with a force stronger than that in the conventional art using both clamps. However, when the wire is strongly pulled, a large tension is applied to the wire, and the wire is easily damaged. Further, when the tension of the wire is large, the remaining twisted length at both ends of the wire tends to be long. Therefore, there is a limit to the way of reducing the amount of deflection by strongly pulling the electric wire.

The present inventors considered a method of providing a support member for supporting an electric wire below the electric wire. Thereby, the amount of deflection of the electric wire can be reduced. However, in the electric wire twisting apparatus in which the recovery tray is provided below the electric wire, if the support member is provided below the electric wire, the twisted electric wire cannot be dropped and recovered on the recovery tray by releasing the grip of the clamp after twisting the electric wire.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electric wire twisting device and a method of manufacturing a twisted electric wire, which can twist an electric wire well even when relatively long electric wires are twisted, and can collect the twisted electric wire by dropping the electric wire downward after the twisting.

(II) technical scheme

The electric wire twisting device disclosed herein includes: a first clamp which holds one end portions of the first and second electric wires; a second clamp configured to hold the other end portions of the first and second electric wires; a rotary actuator that rotates at least one of the first jig and the second jig about a rotation center line extending from the first jig toward the second jig; and an electric wire support member. The wire support member is configured to be movable between a wire support position, which is a position below the rotation center line, between the first jig and the second jig, and a retracted position, which is a position offset from below the rotation center line, and to support the first wire and the second wire when the wire support member is located at the wire support position.

According to the electric wire twisting device, the first electric wire and the second electric wire held by the first jig and the second jig can be supported by the electric wire supporting member by moving the electric wire supporting member to the electric wire supporting position. Therefore, the amount of deflection of the two wires can be reduced. Therefore, the tension generated in each wire can be suppressed, and the damage of each wire can be suppressed. In addition, the twisted surplus length of both end portions of the electric wire can be shortened. Further, since the vibration of the two wires can be reduced at the time of twisting, the variation in the twisting pitch can be suppressed, and the two wires can be twisted well.

Further, according to the above-described electric wire twisting apparatus, after twisting the two electric wires, the electric wire support member is moved from the electric wire support position to the retracted position, thereby retracting the electric wire support member from a position below the twisted two electric wires (hereinafter referred to as twisted electric wires). Therefore, when the grip of the both clamps is released, the twisted electric wire falls downward without being obstructed by the electric wire support member. Therefore, the stranded electric wire can be easily recovered only by releasing the grips of both the clamps.

As described above, according to the wire twisting device, even when relatively long wires are twisted, the wires can be twisted well and collected by dropping the wires downward after the twisting.

According to a preferred aspect, the wire twisting device includes a rotating shaft that rotatably supports the wire support member between the wire support position and the retracted position.

According to the above aspect, the wire support member can be compactly configured.

According to a preferred embodiment, the wire support member is disposed in a central region of a region between the first jig and the second jig, which is divided into three equal parts.

In the case where the wire support member is not provided, the wire held by the first and second clamps is deflected by the maximum amount at the intermediate position between the first and second clamps. According to the above aspect, since the wire support member is disposed in the central region between the two clamps, the wire support member supports the central portion of the two wires where the amount of deflection is large. Therefore, the amount of deflection of each wire can be reduced. Therefore, both wires can be twisted well.

According to a preferred aspect, the wire twisting device includes a movement actuator that is coupled to the wire support member and moves the wire support member between the wire support position and the retracted position.

According to the above aspect, the movement of the wire support member from the wire support position to the retracted position and the movement from the retracted position to the wire support position can be automatically performed.

According to a preferred embodiment, the wire support member includes: a support portion located below the rotation center line when located at the electric wire support position; and a vibration stopper located at one and the other of the support portion in a horizontal direction intersecting the rotation center line and above the support portion when the vibration stopper is located at the wire support position.

During twisting of the electric wire, the electric wire sometimes vibrates in a lateral direction from the rotation center line. However, according to the above aspect, the lateral vibration of the electric wire can be suppressed by the vibration stopper. Therefore, the electric wire can be twisted more favorably.

According to a preferred embodiment, the wire support member includes a support rod portion having a concave portion which extends in a direction intersecting the rotation center line in a plan view when the support rod portion is located at the wire support position and is concave downward when viewed from a direction along the rotation center line.

According to the above aspect, the concave portion can suppress lateral vibration of the electric wire. Therefore, the electric wire can be twisted well.

According to a preferred embodiment, at least one of the first jig and the second jig is configured to be movable in a direction along the rotation center line.

According to the above aspect, the distance between the first jig and the second jig can be adjusted according to the length of the electric wire by moving at least one of the first jig and the second jig in the direction of the rotation center line. Therefore, wires of various lengths can be twisted. In addition, when the wire support member is located at the wire support position, the wire support member may become an obstacle when the jig is moved in the direction of the rotation center line. However, the wire support member can move to the retracted position. By moving the wire support member to the retracted position, the jig can be moved in the direction of the rotation center line without being obstructed by the wire support member. Further, depending on the position of the first jig or the second jig, when the wire supporting member moves from the retracted position to the wire supporting position, there is a possibility that the wire supporting member may come into contact with the first jig or the second jig. However, according to the above aspect, when there is such a possibility, the wire support member is held at the retracted position, so that the wire support member can be prevented from colliding with the first jig or the second jig.

According to a preferred embodiment, the plurality of wire support members are provided in a direction parallel to the rotation center line.

According to the above aspect, the two electric wires held by the first and second clamps can be supported at a plurality of places. Therefore, the amount of deflection of each wire can be further reduced, and both wires can be twisted more favorably.

The method of manufacturing a stranded electric wire disclosed herein manufactures a stranded electric wire using the electric wire stranding apparatus, the method including: a preparation step of moving the wire support member to the wire support position while gripping one end portion and the other end portion of the first wire and the second wire with the first jig and the second jig, respectively; a twisting step of twisting the first electric wire and the second electric wire by rotating at least one of the first jig and the second jig; and a collecting step of moving the wire support member to a retracted position and releasing the first and second clamps to drop and collect the twisted first and second wires.

According to the above-described manufacturing method, even when relatively long electric wires are twisted, the electric wires can be well twisted, and the electric wires can be dropped downward after the twisting and collected.

According to a preferred embodiment, in the preparation step, the first jig and the second jig apply tension to the electric wires such that a difference between the highest position and the lowest position of each electric wire is 10 to 50 times a diameter of each electric wire.

According to the above aspect, the difference between the highest position and the lowest position of each electric wire when gripped by the first gripper and the second gripper is 10 times or more the diameter of each electric wire, and the tension of each electric wire is relatively small. Therefore, damage to each wire can be sufficiently suppressed. In addition, the twisted surplus length of both ends of both electric wires can be shortened. On the other hand, the difference between the highest position and the lowest position of each wire is 50 times or less the diameter of each wire, and the deflection amount is not excessively large. Therefore, vibration of the respective wires at the time of twisting can be suppressed, and both wires can be twisted well.

(III) advantageous effects

As described above, according to the present invention, even when relatively long electric wires are twisted, the electric wires can be well twisted and collected by dropping the electric wires downward after the twisting.

Drawings

Fig. 1 is a perspective view of an electric wire twisting apparatus according to an embodiment.

Fig. 2 (a) and (b) are views of the electric wire support device viewed from a direction along the rotation center line, in which fig. 2 (a) shows a state in which the electric wire support member is located at the electric wire support position; fig. 2 (b) shows a state in which the wire supporting member is located at the retracted position.

Fig. 3 is a top view of a portion of the wire stranding apparatus.

Fig. 4 is a side view of a portion of the wire twisting device.

Fig. 5 is a flowchart of a method of manufacturing a stranded wire.

Fig. 6 is a perspective view of the electric wire twisting device in the twisting process.

Fig. 7 is a plan view of a part of the electric wire twisting device when the gripping of the first and second clamps is released.

Fig. 8 is a perspective view of the electric wire stranding device when the stranded electric wire is recovered.

Fig. 9 is a diagram for explaining the deflection of the electric wire when the electric wire support member is not provided.

Fig. 10 is a view of the electric wire support device of the other embodiment as viewed from a direction along the rotation center line.

Fig. 11 (a) and (b) are views of the electric wire supporting device according to another embodiment viewed from a direction along the rotation center line, in which fig. 11 (a) shows a state in which the electric wire supporting member is located at the electric wire supporting position; fig. 11 (b) shows a state in which the wire supporting member is located at the retracted position.

Fig. 12 is a conceptual diagram illustrating a method of holding and supporting an electric wire from both sides.

Detailed Description

An embodiment of the present invention will be described below with reference to the drawings. As shown in fig. 1, the electric wire twisting device 1 of the present embodiment includes: a first clamp 11 for holding one end portions of a first electric wire 51 and a second electric wire 52; and a second clamp 12 that grips the other end portions of the first electric wire 51 and the second electric wire 52. The electric wire twisting device 1 further includes a motor 13 as a rotation actuator for rotating the first clamp 11. The motor 13 is configured to rotate the first chuck 11 about the rotation center line CL. The rotation center line CL is a virtual straight line extending from the first jig 11 toward the second jig 12, and here is a straight line extending in the horizontal direction.

The first chuck 11 and the motor 13 are supported by a first Holder (Holder)21, and the second chuck 12 is supported by a second Holder 22. The wire stranding device 1 includes a Rail (Rail)14 extending parallel to the rotation center line CL. The first holder 21 and the second holder 22 are supported by the rail 14. At least one of the first holder 21 and the second holder 22 is slidably engaged with the rail 14. Thereby, at least one of the first jig 11 and the second jig 12 can be moved in the direction of the rotation center line CL, and the distance between the first jig 11 and the second jig 12 can be adjusted. Here, the first holder 21 is slidably engaged with the rail 14, and the second holder 22 is non-slidably engaged with the rail 14. Therefore, the first jig 11 is allowed to move in the direction of the rotation center line CL, and the second jig 12 is not moved in the direction of the rotation center line CL. However, the second holder 22 may be slidably engaged with the rail 14, and the first holder 21 may be non-slidably engaged with the rail 14. Further, both the first holder 21 and the second holder 22 may be slidably engaged with the rail 14.

Although not shown, an Actuator (Actuator) for moving the first holder 21 along the rail 14 is disposed inside the first holder 21. The actuator is not particularly limited, and may be, for example, an electric motor.

The wire twisting device 1 includes a wire support device 30 that supports a first wire 51 and a second wire 52. In the present embodiment, three wire support devices 30 are arranged in a direction parallel to the rotation center line CL. The rail 14 and the wire support devices 30 are supported by a stand not shown.

As shown in fig. 2 (a), the wire support device 30 includes: a first support 41 supported by the mount; a second pillar 42 extending laterally from the first pillar 41; the electric wire support member 31; a rotating shaft 32 for rotatably supporting the wire support member 31; and a pneumatic cylinder 33 which rotates the electric wire support member 31. The rotation shaft 32 is disposed on the side of the rotation center line CL (left side of fig. 2 a).

The wire support member 31 is disposed between the first jig 11 and the second jig 12 with respect to the direction of the rotation center line CL (see fig. 1). As shown in fig. 2 (a) and 2 (b), the wire support member 31 is configured to be rotatable between a wire support position, which is a position below the rotation center line CL, and a retracted position, which is a position offset from below the rotation center line CL. Here, the position shown in fig. 2 (a) is the wire supporting position, and the position shown in fig. 2 (b) is the retracted position. Further, the position below the rotation center line CL is a position lower than the rotation center line CL and is a position on a perpendicular line a3 passing through the rotation center line CL.

In the present embodiment, the wire support member 31 is formed of an L-shaped support rod. The wire support member 31 includes: a support rod part 31a that extends straight in a direction intersecting the rotation center line CL in a top view when located at the electric wire support position; a root bar portion 31b that is perpendicular to the support bar portion 31 a; and a connecting portion 31c provided to the root bar portion 31 b. Further, "the direction of intersection" includes: a vertically crossing direction, and an obliquely crossing direction. In the present embodiment, as shown in fig. 3, the support rod portion 31a intersects the rotation center line CL perpendicularly in a plan view.

As shown in fig. 2 (a), a Bracket (socket) 35 extending downward is provided at the distal end of the second support 42. The rotation shaft 32 rotatably connects the connection portion 31c of the wire support member 31 to the bracket 35.

A bracket 36 is provided at the lower end of the first support 41, and a root 33a of the pneumatic cylinder 33 is rotatably coupled to the bracket 36. The front end 33b of the pneumatic cylinder 33 is rotatably coupled to the coupling portion 31c of the wire support member 31. As shown in fig. 2 (a), when the Rod (Rod)33R of the pneumatic cylinder 33 extends, the wire support member 31 moves to the wire support position as indicated by an arrow a 1. As shown in fig. 2 (b), when the rod 33R of the pneumatic cylinder 33 contracts, the wire support member 31 moves to the retracted position as indicated by an arrow a 2.

The position of the wire support member 31 of each wire support device 30 is not particularly limited, and in the present embodiment, as shown in fig. 4, the wire support member 31 of the wire support device 30 is disposed in each of the region B1 on the first jig 11 side, the region B2 in the center, and the region B3 on the second jig 12 side, when the region between the first jig 11 and the second jig 12 is divided into three equal parts.

As shown in fig. 4, a recovery tray 45 for recovering the twisted electric wire 50 is disposed below the rail 14. The recovery tray 45 is disposed below the rotation center line CL and below the wire support position of the wire support member 31.

The above is the structure of the electric wire twisting apparatus 1. Next, a method of manufacturing the stranded electric wire 50 using the electric wire stranding apparatus 1 will be described. Fig. 5 is a flowchart of a manufacturing method of the stranded electric wire 50.

First, a preparation step S1 is performed. In the preparation step S1, one end portions of the two

electric wires

51, 52 are held by the first jig 11, and the other end portions of the two

electric wires

51, 52 are held by the second jig 12. Further, the pneumatic cylinder 33 is driven to move the electric wire support member 31 to the electric wire support position. As a result, both the

wires

51 and 52 are held by the first and

second holders

11 and 12 and supported by the wire support member 31 (see fig. 1, 2 (a), 3, and 4).

In the electric wire twisting device 1, the distance between the first clamp 11 and the second clamp 12 can be adjusted according to the lengths of the first electric wire 51 and the second electric wire 52. Further, the tension of the two

electric wires

51 and 52 can be adjusted by adjusting the distance between the first jig 11 and the second jig 12 (hereinafter referred to as the jig distance). For example, by increasing the jig interval, the

wires

51 and 52 can be strongly pulled to increase the tension. Conversely, by reducing the clip spacing, the tension can be reduced. However, if the tension is small, the amount of deflection of the

wires

51, 52 becomes large. On the other hand, if the tension is large, the

wires

51 and 52 are easily damaged, and a twisted surplus is easily generated at both ends of the

wires

51 and 52 at the time of twisting. The clamp spacing is therefore preferably adjusted so that: the

wires

51 and 52 are prevented from being damaged, the twisted portions at both ends are not easily left, and a tension not causing an excessive deflection is applied. In the present embodiment, the jig interval is adjusted so that the difference Δ H (see fig. 4) between the highest position H1 and the lowest position H2 of each

electric wire

51, 52 is 10 to 50 times the diameter of each electric wire 51, 52 (the diameters of the

electric wires

51, 52 are shown in fig. 4 in an exaggerated manner than in reality). This allows the

wires

51 and 52 to be appropriately tensioned. However, the appropriate tension varies depending on the length, outer diameter, material, and the like of the

wires

51, 52. The above is only an example of an appropriate tension, and the tension applied to the

wires

51 and 52 is not limited to a specific value.

Next, the twisting step S2 is performed. As shown in fig. 6, in the twisting step S2, the motor 13 is driven to rotate the first chuck 11 about the rotation center line CL. Thereby, the first electric wire 51 and the second electric wire 52 are twisted to become the stranded electric wire 50. When the two

wires

51 and 52 are twisted, there is a possibility that the

wires

51 and 52 vibrate from the rotation center line CL. However, according to the present embodiment, since the wire support member 31 is disposed below both the

wires

51 and 52, downward vibration of the

wires

51 and 52 can be suppressed. Therefore, the

wires

51 and 52 can be twisted well, and variation in the twist pitch of the stranded wire 50 can be suppressed. A high-quality stranded electric wire 50 can be obtained.

When the motor 13 is stopped, the twisting step S2 ends. After the twisting step S2 is completed, a recovery step S3 is performed to recover the twisted electric wire 50. In the recovery step S3, the pneumatic cylinder 33 is driven to move the wire support member 31 to the retracted position (see fig. 2 (b)). Thereby, the wire support member 31 is retracted to a position offset from the vertical line passing through the stranded wire 50. Then, as shown in fig. 7, the first jig 11 and the second jig 12 are opened, and the gripping of the first jig 11 and the second jig 12 is released. Then, as shown in fig. 8, the twisted electric wires 50 fall by their own weight and are collected in the collection tray 45 (see fig. 4). At this time, the wire support member 31 is located at the retracted position, and therefore, the collection of the stranded wires 50 is not hindered.

Although fig. 7 and 8 show the first and

second clamps

11 and 12 in the vertical direction (the state in which the pair of grip pieces are arranged in the horizontal direction), the first and

second clamps

11 and 12 may be released from gripping in the horizontal direction (the state in which the pair of grip pieces are arranged in the vertical direction; see fig. 6). In the recovery step S3, the state of the both

jigs

11, 12 is not particularly limited.

As described above, according to the electric wire twisting apparatus 1 of the present embodiment, the

electric wires

51 and 52 gripped by the first and

second clamps

11 and 12 can be supported by the electric wire supporting member 31 by moving the electric wire supporting member 31 to the electric wire supporting position. Therefore, even if the

wires

51 and 52 are not strongly pulled by the

clamps

11 and 12, the amount of deflection of the

wires

51 and 52 can be reduced. Therefore, even if the

wires

51 and 52 are relatively long, the tension generated in the

wires

51 and 52 can be suppressed, and damage to the

wires

51 and 52 can be suppressed. Further, the twisted surplus length of both end portions of the

wires

51 and 52 can be shortened. Further, since the vibration of the two

wires

51 and 52 can be reduced at the time of twisting, the variation in the twisting Pitch (Pitch) can be suppressed, and the two

wires

51 and 52 can be twisted well.

Further, according to the electric wire twisting device 1 of the present embodiment, after twisting the two

electric wires

51 and 52, the electric wire support member 31 is moved from the electric wire support position to the retracted position, thereby retracting the electric wire support member 31 from the position below the twisted electric wire 50. When the grips of the both clamps 11 and 12 are released, the stranded wire 50 falls downward without being obstructed by the wire support member 31. Therefore, the stranded electric wire 50 can be easily collected only by releasing the grips of both the

clamps

11 and 12. Further, the pitch measurement of the stranded electric wires 50 may be performed after twisting the two

electric wires

51, 52. According to the electric wire twisting device 1 of the present embodiment, the effect of enabling the pitch measurement to be performed without being hindered by the electric wire support member 31 can also be obtained.

As described above, according to the electric wire twisting device 1 of the present embodiment, even when relatively long

electric wires

51 and 52 are twisted, the

electric wires

51 and 52 can be twisted well, and the twisted electric wire 50 can be dropped downward and collected after being twisted.

The wire supporting member 31 may be movable between the wire supporting position and the retracted position, and the moving manner and the moving trajectory thereof are not limited at all. However, according to the present embodiment, the support device 30 is configured to include the rotating shaft 32 that rotatably supports the wire support member 31, and the wire support member 31 is configured to move between the wire support position and the retracted position by rotating. As shown in fig. 2 (a) and (b), since the wire support member 31 is configured to rotate, the movement locus of the wire support member 31 is relatively small. Therefore, a space available for movement is small, and the electric wire support member 31 can be configured compactly. The rotation shaft 32 is located on the side of the

wires

51 and 52, and can support the center portions of the

wires

51 and 52 by a compact mechanism.

As shown in fig. 9, when the wire support member 31 is not provided, the

wires

51 and 52 held by the

clamps

11 and 12 are greatly bent, and the amount of bending is maximized at the center in the longitudinal direction. However, according to the electric wire twisting device 1 of the present embodiment, as shown in fig. 4, the electric wire support member 31 is disposed in the central region B2 obtained by trisecting the region between the first jig 11 and the second jig 12. Since the central portions of the two

electric wires

51, 52 can be supported, the amount of deflection of the respective

electric wires

51, 52 can be reduced. Therefore, the

wires

51 and 52 can be twisted well without pulling the

wires

51 and 52 with a large force by the

clamps

11 and 12.

The wire support device 30 may not include a movement actuator (the pneumatic cylinder 33 in the above embodiment) for moving the wire support member 31, and the movement of the wire support member 31 between the wire support position and the retracted position may be performed manually. However, according to the present embodiment, since the pneumatic cylinder 33 is provided as the movement actuator for moving the wire support member 31, the movement of the wire support member 31 from the wire support position to the retracted position and the movement from the retracted position to the wire support position can be automatically performed.

According to the present embodiment, the wire support member 31 has the support rod portion 31a, and the support rod portion 31a extends straight in a direction intersecting the rotation center line CL in a plan view when located at the wire support position (see fig. 2 (a)). The support rod portion 31a has a simple structure. Therefore, the aforementioned effects can be obtained with an inexpensive and simple structure.

The electric wire twisting device 1 of the present embodiment includes a recovery tray 45, and the recovery tray 45 is disposed below the electric wire supporting position of the electric wire supporting member 31 (see fig. 4). After twisting the

electric wires

51 and 52, the grips of the both clamps 11 and 12 are released, and the twisted electric wires 50 fall by their own weight and can be easily collected in the collection tray 45.

However, the method of recovering the stranded wire 50 is not particularly limited. For example, a conveyor may be disposed below the rotation center line CL, and a recovery tray may be disposed at a downstream end of the conveyor in the conveying direction. In this case, when the grips of the both

grippers

11 and 12 are released, the stranded electric wires 50 fall onto the conveyor belt, are conveyed by the conveyor belt, and are then collected on the collection tray.

In the electric wire twisting device 1 of the present embodiment, the first clamp 11 is configured to be movable in the direction of the rotation center line CL. Therefore, the distance between the first jig 11 and the second jig 12 (jig distance) can be adjusted according to the lengths of the

wires

51 and 52. Therefore, the

wires

51 and 52 of various lengths can be twisted. For example, when the 2/3-length wires of the

wires

51 and 52 shown in fig. 3 are twisted, the first jig 11 is moved toward the second jig 12, whereby the jig interval can be adjusted to 2/3. Therefore, even when the length of the wire to be twisted is changed to 2/3, the wire can be held by the first and

second clamps

11 and 12 while maintaining the tension within a predetermined range.

When the jig interval is adjusted to 2/3 as described above, the wire support member 31 on the first jig 11 side is located at the same position as the first jig 11 with respect to the direction of the rotation center line CL. Therefore, if the first jig 11 is moved when each wire supporting member 31 is located at the retracted position, and then each wire supporting member 31 is moved from the retracted position to the wire supporting position, the wire supporting member 31 on the first jig 11 side collides with the first jig 11. Therefore, in this case, the wire support member 31 on the first jig 11 side may be held at the retracted position, and the other wire support member 31 may be moved to the wire support position. This makes it possible to avoid the wire support member 31 on the first jig 11 side from colliding with the first jig 11, and to support the

wires

51 and 52 by the other wire support member 31.

Further, when the wire supporting member 31 is located at the wire supporting position at the time of adjusting the jig interval, the first jig 11 can also be moved in the direction of the rotation center line CL. In this case, the wire supporting member 31 on the first jig 11 side, which is located at the wire supporting position, interferes with the movement of the first jig 11. However, in this case, the wire support member 31 on the first jig 11 side may be moved to the retracted position in advance. This can avoid collision with the first jig 11, and prevent the wire support member 31 from becoming an obstacle when the first jig 11 moves.

According to the electric wire twisting device 1 of the present embodiment, the plurality of electric wire support members 31 are provided in the direction parallel to the rotation center line CL. The number of the wire support members 31 is not particularly limited, and three wire support members are provided in the present embodiment. Therefore, the

electric wires

51 and 52 held by the first and

second clamps

11 and 12 can be supported at three positions. Therefore, the amount of deflection of the

wires

51, 52 can be sufficiently reduced, and both the

wires

51, 52 can be twisted well.

In the preparation step S1, the values of the tensions applied to the

electric wires

51 and 52 by the first and

second jigs

11 and 12 are not limited at all, and in the present embodiment, the tension is set such that the difference Δ H between the highest position H1 and the lowest position H2 of each

electric wire

51 and 52 is 10 to 50 times the diameter of each

electric wire

51 and 52. Since the tension is not excessively large, damage to the

wires

51 and 52 can be sufficiently suppressed, and the remaining twisted length at both ends of the twisted wire 50 can be shortened. Further, since the tension is not excessively small, the amount of deflection of the

wires

51, 52 can be prevented from increasing, and the

wires

51, 52 can be twisted well. Variation in the twist pitch of the stranded wires 50 can be suppressed, and high-quality stranded wires 50 can be obtained.

Although one embodiment of the present invention has been described above, it is needless to say that the present invention is not limited to the above embodiment. The present invention can be implemented in various other ways. Examples of other embodiments will be briefly described below.

As shown in fig. 10, in the above embodiment, the support rod part 31a may have: a support portion 31s located below the rotation center line CL when the electric wire support member 31 is located at the electric wire support position; and a vibration stopper 37 located above the support portion 31s and located on one and the other of the support portion 31s in a horizontal direction (the left-right direction in fig. 10) perpendicular to the rotation center line CL. The vibration stopper 37 may be formed of, for example, a convex portion protruding upward. Thus, if the wire support member 31 has the vibration stopper 37, the vibration stopper 37 can prevent the lateral vibration of the

wires

51 and 52 when twisting the

wires

51 and 52. Therefore, the

wires

51 and 52 can be twisted more favorably.

As shown in fig. 11 (a) and (b), the support rod part 31a of the electric wire support member 31 may have a concave part 31d which extends in a direction intersecting the rotation center line CL in a plan view when located at the electric wire support position and which is concave downward as viewed in the direction along the rotation center line CL. In this embodiment, the bottom of the recess 31d serves as a support portion, and both side portions of the recess 31d constitute vibration stopper portions. The one side portion 31f of the recess 31d extends to be farther from the rotation center line CL as it goes upward. The other side portion 31g extends in a vertical line. However, the shape of the

side portions

31f and 31g is not particularly limited. For example, both the

side portions

31f and 31g may extend so as to be spaced apart from the rotation center line CL in an upward direction, or may extend in a vertical line shape. Other structures are the same as those of the above embodiment, and therefore, description thereof is omitted. In fig. 11 (a) and (b), the same reference numerals are given to the same portions as those of the above embodiment.

In this embodiment, since the support rod portion 31a has the concave portion 31d, the

wires

51 and 52 can be prevented from vibrating in the lateral direction when the

wires

51 and 52 are twisted, as in the above-described embodiment.

When the first and

second jigs

11, 12 grip the

electric wires

51, 52, the

electric wires

51, 52 are laterally separated from each other (see fig. 1). In this embodiment, the side portion 31f of the support rod portion 31a is inclined from the vertical line, and the lateral width of the concave portion 31d decreases toward the lower side. Therefore, when the wire support member 31 is moved from the retracted position to the wire support position, both the

wires

51 and 52 can be brought close to the rotation center line CL by the concave portion 31 d. This allows both the

wires

51 and 52 to be twisted more favorably.

However, the wire support member 31 is merely an example, and the shape and size of the wire support member 31 are not particularly limited. The cross-sectional shape of the wire support member 31 is not limited to a circle, and may be a quadrangle or another shape.

In the above embodiment, three wire support members 31 are provided, but the number of the wire support members 31 may be one. In this case, the wire support member 31 is preferably disposed in the central region B2 obtained by trisecting the region between the first jig 11 and the second jig 12. However, the wire support member 31 is not particularly limited, and may be disposed in other regions B1 and B3.

In the above embodiment, the wire supporting device 30 may be moved in a direction parallel to the rotation center line CL. For example, a rail parallel to the rotation center line CL may be provided, and the wire support device 30 may be slidably engaged with the rail. The wire support device 30 may be detachably attached to a plurality of positions in a direction parallel to the rotation center line CL.

In the case where a plurality of wire support members 31 are provided, the interval between the first jig 11 and the wire support member 31 on the first jig 11 side and the interval between the second jig 12 and the wire support member 31 on the second jig 12 side may be equal to or different from each other with respect to the direction of the rotation center line CL. The interval between two adjacent wire support members 31 may be equal to or different from the interval between the first jig 11 and the wire support member 31 on the first jig 11 side or the interval between the second jig 12 and the wire support member 31 on the second jig 12 side. In the case where three or more wire support members 31 are provided, the intervals between two adjacent wire support members 31 may be equal to or different from each other.

In this specification, "support the electric wire (support the electric wire)" means that the electric wire does not move downward. The "support wire (support wire)" is not limited to the case of supporting the wire from below, and includes, for example, the case of holding the wire from both sides and preventing the wire from moving downward. For example, as shown in fig. 12, the first electric wire 51 and the second electric wire 52 may be held from both sides by the concave portion 31d of the electric wire support member 31 to be prevented from moving downward. In this case, the gap S may be generated between the

wires

51 and 52 and the recess 31 d.

The wire support member 31 supports the first wire 51 and the second wire 52 when positioned at the wire support position, but one or both of the

wires

51 and 52 may be temporarily separated from the wire support member 31 during twisting of the

wires

51 and 52. The "support" mentioned here is not limited to the case where both the

electric wires

51 and 52 are always in contact with the electric wire support member 31 and supported, but also includes the case where the electric wires are temporarily separated during the twisting process as described above.

The number of the electric wires twisted by the electric wire twisting device 1 is not limited to two, and may be three or more.

The first and

second holders

11 and 12 are not limited in structure. The first jig 11 may grip one end portion of the first electric wire 51 and one end portion of the second electric wire 52 together as in the above-described embodiment, or may have two gripping portions that individually grip one end portion of the first electric wire 51 and one end portion of the second electric wire 52. Similarly, the second jig 12 may grip the other end portions of the first electric wire 51 and the second electric wire 52 together, or may have two gripping portions that individually grip the other end portion of the first electric wire 51 and the other end portion of the second electric wire 52.

In the above embodiment, when the twisting step is performed, the first holder 11 rotates about the rotation center line CL and the second holder 12 does not rotate. However, the second clamp 12 may be configured to be rotatable about the rotation center line CL, and the electric wire twisting device 1 may include a rotation actuator (e.g., a motor) that rotates the second clamp 12. The first and

second clamps

11 and 12 may be configured to rotate in opposite directions to each other when the twisting process is performed, or only the second clamp 12 may be configured to rotate.

In the above embodiment, the wire support member 31 is configured to be rotatable about a horizontal line, but the direction of rotation is not particularly limited. For example, the wire support member 31 may be configured to be rotatable about a vertical line and to be rotatable in a horizontal direction. In addition, the moving manner of the electric wire support member 31 is not limited to rotation. The wire support member 31 may be configured to move in a direction intersecting the rotation center line CL in a plan view. The wire supporting member 31 may be configured to move between the wire supporting position and the retracted position by expanding and contracting in a direction intersecting the rotation center line CL in a plan view. The wire support member 31 may be configured to move between the wire support position and the retracted position by moving in parallel.

The moving actuator that moves the electric wire support member 31 is not limited to the pneumatic cylinder 33. The moving actuator may be another type of actuator such as a hydraulic cylinder, a Solenoid (Solenoid), or an electric motor.

The rotary actuator that rotates the first chuck 11 or the second chuck 12 is not limited to the motor 13.

The wire twisting device and the twisted wire manufacturing method according to the present invention are particularly effective for long wires (e.g., 4 to 5m wires), but the length of the wire is not particularly limited.

Description of the reference numerals

1-a wire stranding apparatus; 11-a first clamp; 12-a second clamp; 13-electric motor (rotary actuator); 30-a wire support; 31-a wire supporting member; 31 a-a support bar portion; 31 d-recess; 31 s-a support portion; 32-a rotation axis; 33-pneumatic cylinders (moving actuators); 37-vibration stop part; 45-recovery tray; 50-stranded wire; 51-a first wire; 52-a second wire; CL-center of rotation.

Claims

1. An electric wire twisting device is provided with:

a first clamp which holds one end portions of the first and second electric wires;

a second clamp configured to hold the other end portions of the first and second electric wires;

a rotary actuator that rotates at least one of the first jig and the second jig about a rotation center line extending from the first jig toward the second jig; and

and an electric wire support member which is movable between an electric wire support position, which is a position below the rotation center line, and a retracted position, which is a position offset from below the rotation center line, between the first jig and the second jig, and which is configured to support the first electric wire and the second electric wire when the electric wire support member is located at the electric wire support position.

2. The wire stranding apparatus according to claim 1,

the wire support member is rotatably supported between the wire support position and the retracted position by a rotating shaft.

3. The wire stranding apparatus according to claim 1 or 2,

the wire support member is disposed in a central region of a region between the first jig and the second jig, which is trisected.

4. The wire stranding apparatus according to claim 1 or 2,

the electric wire support device is provided with a movement actuator which is connected to the electric wire support member and moves the electric wire support member between the electric wire support position and the retreat position.

5. The wire stranding apparatus according to claim 1 or 2,

the wire support member includes: a support portion located below the rotation center line when located at the electric wire support position; and a vibration stopper located at one and the other of the support portion in a horizontal direction intersecting the rotation center line and above the support portion when the vibration stopper is located at the wire support position.

6. The wire stranding apparatus according to claim 1 or 2,

the wire support member has a support rod portion that has a concave portion that extends in a direction intersecting the rotation center line in a plan view when the support rod portion is located at the wire support position, and that is concave downward when viewed from a direction along the rotation center line.

7. The electric wire twisting device according to claim 1 or 2, wherein at least one of the first clamp and the second clamp is configured to be movable in a direction along the rotation center line.

8. The electric wire stranding apparatus according to claim 1 or 2, wherein the electric wire support member is provided in plurality in a direction parallel to the rotation center line.

9. A manufacturing method of a stranded electric wire, which manufactures a stranded electric wire using the electric wire stranding apparatus of claim 1, the manufacturing method comprising:

a preparation step of moving the wire support member to the wire support position while gripping one end portion and the other end portion of the first wire and the second wire with the first jig and the second jig, respectively;

a twisting step of twisting the first electric wire and the second electric wire by rotating at least one of the first jig and the second jig; and

and a collecting step of moving the wire support member to a retracted position and releasing the first and second clamps to drop and collect the twisted first and second wires.

10. The method of manufacturing a stranded electric wire according to claim 9,

in the preparation step, the first and second clamps apply tension to the electric wires such that a difference between the highest position and the lowest position of each electric wire is 10 to 50 times a diameter of each electric wire.