JP2005251451A - Device and method for manufacturing self-supporting cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method for manufacturing a self-supporting cable, capable of forming a neck part and a window part in a constricted part so as to have a fixed longitudinal length and increasing the manufacturing linear velocity of the cable. <P>SOLUTION: In the manufacture of the self-supporting cable 1, wherein the periphery of a cable and a suspension wire is integrally coated with an insulating resin, and the constricted part comprising the neck part 6 and the window part 7 is formed between the cable and the suspension wire, the advancing and retreating operation of a window opening member 17 to mold the neck part 6 and the window part 7 is carried out by a cam mechanism. The cam mechanism adjusts and sets the longitudinal length of the neck part 6 and the window part 7 by changing the rotational speed of a cam in response to the rotational position of the cam 20, and highly accurate control is carried out by an AC servo motor 19. In addition, the neck part 6 and the window part 7 are formed by fixing the driving speed of the advancing and retreating operation of the window opening member 17 regardless of the fluctuation of the manufacturing linear velocity of the cable. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a manufacturing apparatus and a manufacturing method of a self-supporting cable in which reinforcing suspension lines are arranged in parallel on a cable body and are integrally formed of resin.

  When installing a cable for communication or power supply, or an optical fiber cable, which has been increasingly used in recent optical communication development, on a utility pole, the cable itself has insufficient tensile strength. Prone to occur. For this reason, usually, a self-supporting cable in which a suspension wire made of a steel wire or the like is arranged in parallel with the cable body and integrated through a coating resin is used.

  FIG. 4 is a diagram showing an example of a self-supporting cable, in which 1 is a self-supporting cable, 2 is a cable body, 3 is a hanging wire, 4 is a coating resin, 5 is a constricted portion, 6 is a neck portion, and 7 is a neck portion. The window is shown. As shown in FIG. 4, the self-supporting cable 1 has suspension lines 3 arranged in parallel with the cable body 2, and each is covered with a coating resin 4, and a constricted portion 5 is provided between the cable body 2 and the suspension line 3. In general, a configuration in which the two are integrally connected to each other is provided. In the self-supporting cable 1, the window 7 is formed in the constricted portion 5 in order to reduce an area where wind is received and a cable load tension increases and a dancing phenomenon or the like is reduced. In addition, let the connection part which connects the part of the cable main body 2 and the part of the suspension wire 3 between the window parts 7 be the neck part 6. FIG.

The window portion 7 is formed in the constricted portion 5 by punching using a press machine, but the bead-like shavings remain at the edge portion, and the formation accuracy is not good and the appearance is not good. For this reason, a method using a processing laser for forming the window portion 7 (see Patent Document 1), a method using a shutter mechanism (see Patent Document 2), and the like are known.
JP-A-8-83526 JP-A-8-306252

  FIG. 5 is a diagram illustrating an example of a manufacturing example of a self-supporting cable using a shutter mechanism as disclosed in Patent Document 2. In the figure, 8 is a resin extruder, 9 is a window lighting device, 10 is a cooling device, 11 is a take-up capstan device, 12 is an extrusion head, 13 is a cable coating hole, 14 is a hanging wire coating hole, and 15 is a constriction. A forming hole portion, 16 is an air cylinder device, 17 is an opening / closing member (a window member), and 18 is an electromagnetic valve.

  As shown in FIG. 5 (A), the self-supporting cable 1 is formed by extruding the coating resin 4 in a form in which the resin extruder 8 is connected to the outer periphery of the cable body 2 and the suspension wire 3 in FIG. The After the neck portion 6 and the window portion 7 are formed by the window lighting device 9 provided at the outlet portion of the resin extruder 8, the coating resin 4 is cooled and cured by the cooling device 10. Thereafter, the self-supporting cable 1 is taken up by the take-up capstan device 11 and taken up on a take-up bobbin (not shown).

  FIG. 5B is a diagram for explaining the outline of the windowing device 9. The windowing device 9 can move an opening / closing member (also called a windowing member) 17 to the side of the extrusion head 12 that extrudes the coating resin 4. It is provided and configured. The extrusion head 12 is formed by an extrusion hole having a shape in which the cable covering hole portion 13 and the hanging wire covering hole portion 14 communicate with each other at the constricted portion forming hole portion 15, and the window member 17 enters and exits the constricted portion forming hole portion 15. The neck 6 and the window 7 are molded by repeating the above. Patent Document 2 does not disclose the driving means for the opening / closing member 17, but as one method, driving means using the air cylinder device 16 is used, and the opening / closing member 17 is moved forward and backward by turning on / off the electromagnetic valve 18 and the like. Is done.

  However, the forward / backward operation of the opening / closing member 17 using air as a drive source is simple in terms of mechanism, but there is unevenness in the response of the cylinder of about several tens of ms, and the length of the neck portion 6 and the window portion 7 in the longitudinal direction. Are likely to vary. In addition, there is a problem that it is difficult to increase the cable production speed and the productivity cannot be increased. Even when performing laser processing as shown in Patent Document 1, it is difficult to increase the cable manufacturing speed too much because the window is processed while the cable is moved intermittently, and laser processing is an apparatus. It is expensive and expensive.

  The present invention has been made in view of the above-described circumstances, and can form a neck portion and a window portion of a constricted portion with a certain length in the longitudinal direction, and can increase the cable production speed. It is an object to provide a cable manufacturing apparatus and a manufacturing method.

  In the self-supporting cable manufacturing apparatus and manufacturing method according to the present invention, the cable body and the outer periphery of the suspension line are integrally covered with an insulating resin, and a constricted portion including a neck portion and a window portion is formed between the cable body and the suspension line. In the manufacture of the support type cable, the window member for forming the neck portion and the window portion is advanced and retracted by the cam mechanism. Also, the cam mechanism adjusts and sets the longitudinal lengths of the neck portion and the window portion by changing the cam rotation speed according to the rotational position of the cam, and further performs high-precision control with an AC servo motor. Further, the neck portion and the window portion are formed with the speed of the window member moving forward and backward being constant regardless of the change in the cable production line speed.

  According to the present invention, by driving the window member using the cam mechanism, the window member can be moved forward and backward with a stable and constant operation without variation, and the length of the neck portion and the window portion at the constricted portion is constant. Quality self-supporting cables can be manufactured. In addition, according to the present invention, it is possible to increase the cable production line speed, and even if the cable production line speed is changed, the rotation speed is changed in accordance with the rotational position of the cam, so that the neck part and the window part can be set in a desired manner. Can be set to length. As a result, it is not necessary to replace the rotating cam, and the end shape of the neck portion or window portion is made constant by keeping the speed of the window member moving forward and backward regardless of the cable production speed. be able to.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram for explaining the outline of the present invention, FIG. 2 is a diagram for explaining the operation of the cam mechanism, and FIG. 3 is a diagram for explaining the length setting of the neck and the window. In the figure, 19 is a drive motor, 20 is a rotating cam, 20a, 20b and 20c are cam surfaces, 20 'is a cylindrical groove cam, 21 is a cam follower, 22 is a power transmission mechanism, 22a is a transmission part, 22b is a transmission part, Reference numeral 22c denotes another cam mechanism, reference numeral 23 denotes a position detection sensor, and reference numeral 24 denotes a control device. Description of other reference numerals is omitted by using the same reference numerals as those used in FIGS.

  The self-supporting type cable according to the present invention is manufactured by extruding a coating resin on the outer periphery of the cable body and the suspension line by the resin extruder 8 as shown in FIG. The neck portion 6 and the window portion 7 are formed by the window light device 9 provided at the outlet portion of the extruder 8. As shown in part of FIG. 1 (B), the window device 9 is configured by providing a window member (also referred to as an opening / closing member) 17 on the side of the extrusion head 12 for extruding the coating resin so as to be able to advance and retract. Is done. The extrusion head 12 is formed as an extrusion hole having a shape that allows the cable covering hole 13 and the hanging wire covering hole 14 to communicate with each other at the constricted portion forming hole 15, and the window member 17 is moved forward and backward in the constricted portion forming hole 15. By doing so, the neck portion 6 and the window portion 7 are formed.

  In the present invention, the window member 17 is advanced and retracted by the cam mechanism. The rotating cam 20 shown in FIG. 1A is merely shown as a model for explanation. As the rotating cam 20 rotates, the cam follower 21 of the window member 17 moves on the cam surfaces 20a, 20b, and 20c. Trace and move the window member 17 forward and backward. The rotating cam 20 is rotated by, for example, a drive motor 19 such as a servo motor, and the window member 17 is advanced and retracted at a predetermined cycle to form the neck 6 and the window 7 in the self-supporting cable 1 shown in FIG. To do.

  The cam mechanism is configured, for example, by controlling the rotation of a cylindrical groove cam 20 ′ as shown in FIG. Between the drive motor 19 and the cylindrical groove cam 20 ′, there is disposed a power transmission mechanism 22 in which a transmission portion 22a for transmitting the rotation of the motor, a transmission portion 22b for converting the rotation speed, and other cam members 22c are combined. Thus, it can be driven intermittently or in various other forms. In addition to the cylindrical groove cam shown in the figure, the cam has various shapes called a straight advance cam, plate cam, flat groove cam, conjugate cam, end face cam, cylindrical rib cam, parallel cam, roller gear cam, etc. Can be used.

As shown in FIG. 2 (A), the rotary cam 20 shown as a model, for example, the convex cam surface 20a having a rotation angle theta ₁ to correspond to the formation of the neck portion 6, concave cam having a rotation angle theta ₂ The surface 20b is made to correspond to formation of the window part 7. FIG. On both sides of the rotation angle theta ₃ of the rotation angle theta ₁ is provided with inclined cam surfaces 20c, advancing and retracting the MadoAkira member 17 at a predetermined operating speed. When the cam surface of the rotating cam 20 is linear, it can be expressed as a straight cam as shown in FIG. Each cam surface is formed with a preset rotation angle θ ₁ , θ ₂ , θ ₃ .

Here, the cam follow 21 abuts on the rotation angle theta ₁ of the convex cam surface 20a, MadoAkira member 17 enters into the extrusion head of the resin, for example, the neck portion by an opening provided in the MadoAkira member 17 6 is molded. On the other hand, when the cam following 21 to concave cam surface 20b of the rotation angle theta ₂ abuts, MadoAkira member 17 to exit from the extrusion head of the resin, for example, closed opening provided in MadoAkira member 17 windows Part 7 is molded. Further, the cam follower 21 moves on the inclined cam surface 20c, and the window member 17 is advanced and retracted at a predetermined speed. Depending on the operating speed of the window member 17 at this time, the shape of both end edges of the neck 6 becomes thinner or thicker.

  If the rotation speed of the rotary cam 20 is kept constant, the forward / backward operation of the window member 17 that follows the rotation cam is constant at a predetermined cycle and becomes stable. The rotation of the rotary cam 20 is stably rotated and controlled by using a servo motor or the like. For this reason, the window member 17 is moved back and forth using a cam mechanism as compared with a conventional window member 17 using a conventional air cylinder, so that the constricted portion 5 of the self-supporting cable 1 varies. It is possible to form a neck portion 6 and a window portion 7 having a certain shape without any gaps. As a result, the production speed of the cable can be improved, and the productivity can be increased.

  When the cam mechanism is used, the longitudinal lengths of the neck portion 6 and the window portion 7 also change when the rotational speed of the rotary cam 20 is constant and the cable production speed is changed. Therefore, the longitudinal lengths of the neck 6 and the window 7 can be adjusted by changing the rotational speed of the rotary cam 20 in accordance with the cable production line speed, but the length of the neck 6 and the window 7 can be adjusted. Only when the ratio is constant. However, if it is desired to change the ratio of the length of the neck portion 6 and the window portion 7, it is necessary to replace the rotating cam 20 with a changed shape, but this lowers the working efficiency and increases the cost. Further, if the rotational speed of the rotary cam 20 is changed depending on the cable manufacturing line speed, the advance / retreat speed of the window member 17 also changes, so that the thickness of the end portion of the neck portion 6 may change and the desired thickness may not be obtained. .

Therefore, in the present invention, it is preferable to perform control so that the cam rotation speed can be changed according to the rotation position of the cam. The rotational position of the cam can be detected by, for example, detecting the starting point position P of the rotating cam 20 shown in FIG. 2 with the position detection sensor 23 or the like, or using a rotary encoder. In the rotation angle theta ₁ of the convex cam surface 20a, the rotational speed of the rotating cam 20 and N _1, the rotation speed of the rotation angle theta ₂ in the rotary cam 20 of the concave cam surface 20b and N _2, The inclination The rotational speed of the rotary cam 20 at the rotational angle θ ₃ of the cam surface 20c is N ₃ . Also, let V be the cable production speed. If one rotation of the rotating cam 20 is one cycle,
The length _{L 1} of the neck _{6, V × θ 1/360 ×} 1 / N 1 , and the
The length _{L 2} of the window portion 7 becomes _{V × θ 2/360 × 1} / N 2.

Also, the rotation angle theta ₃ of the length of the cam surface 20c is a degree that can be substantially ignored, than producing linear velocity V of the cable prone shape change due to reciprocating speed of MadoAkira member 17. For example, if the window member 17 has a slow advance / retreat speed, the end of the neck 6 becomes a thin, sharp edge, and if it is fast, a thick, square edge. Therefore, the cam rotation speed N ₃ of the rotation angle theta ₃ is preferably either to constant regardless of changes in manufacturing line speed V of the cable.

The cam rotation speeds N ₁ , N ₂ , and N ₃ are individually adjusted according to the rotation positions of the respective cam surfaces as described above. For this reason, it is preferable to use a servomotor capable of high-precision drive control and high output. The servo motor includes an AC drive AC servo motor and a DC drive DC servo motor, but any servo motor may be used. However, since the drive of the servo motor is not repeatedly stopped during cable manufacture, an AC servo motor with a large driving force during rotation is preferred.

In the present invention, by setting the length L ₂ of the length L ₁ and a window portion 7 of the neck 6, in accordance with the production line speed V of the cable, from the above equation (see FIG. 3), the rotation angle theta _1, theta _The cam rotation speeds N ₁ , N ₂ , and N ₃ are adjusted every ₂ and θ ₃ . By inputting this into the control device 24 and detecting and controlling the rotational position of the cam, a self-supporting cable having a neck portion 6 having a length set to a desired value and a constricted portion 5 of the window portion 7 is obtained. We try to manufacture with high accuracy. Various settings may be input once to the control device 24 and stored, and the constricted portion can be formed in a desired shape without using a cam having various shapes.

In some products, for example, the length _{L 1} of the neck portion 6 of the neck portion 5 of the self-supporting cable in 35Mm～50mm, length _{L 2} of the window portion 7 is determined to 500Mm～600mm. When this constricted portion 5 is formed using a conventional air cylinder mechanism, the length L ₁ of the neck portion 6 is 42.0 ± 4.0 mm, whereas it is formed using the cam mechanism according to the present invention. the length _{L 1} of the neck 6 was 43.0 ± 1.0 mm. Further, the length L ₂ of the window portion 7 formed using the conventional air cylinder mechanism is 546.5 ± 6.5 mm, whereas the window portion 7 formed using the cam mechanism according to the present invention. length _{L 2} was 543.0 ± 1.5 mm. From this result, as in the present invention, the self-supporting cable having the neck portion 6 and the window portion 7 having the constricted portion 5 with no variation is manufactured by performing the forward and backward operation of the window light member 17 using the cam mechanism. be able to.

Further, the constant production line velocity V of the cable, 24 mm length _{L 1} of the neck 6, 29 mm, and measured by setting the rotational speed of the cam so that the 34 mm. The 29 mm one was 28 mm and there was an error of 1.0 mm, but for the other, the set value and the actually measured value were the same. Further, when the cable production linear velocity V was changed and the rotation speed was changed so as to be the same length of the neck portion 6, the length L ₁ of the neck portion 6 was 24 mm, which was 23 mm and 1.0 mm. There was an error, but in other cases, the set value and the measured value were the same. From this result, according to the present invention, a self-supporting cable having a neck portion 6 having a desired length and a constricted portion 5 of a window portion 7 can be accurately manufactured at various cable manufacturing line speeds without replacing the cam. can do.

It is a figure explaining the outline of the present invention. It is a figure explaining operation | movement of the cam mechanism in this invention. It is a figure explaining the length setting of the neck part and window part of a constriction part in this invention. It is a figure explaining the example of a general self-supporting type cable. It is a figure which shows an example which forms the neck part and window part of the conventional constriction part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Self-supporting type cable, 2 ... Cable main body, 3 ... Hanging wire, 4 ... Covering resin, 5 ... Constriction part, 6 ... Neck part, 7 ... Window part, 8 ... Resin extruder, 9 ... Window-lighting device, 10 ... Cooling , 11 ... take-up capstan device, 12 ... extrusion head, 13 ... cable covering hole, 14 ... hanging wire covering hole, 15 ... constriction forming hole, 16 ... air cylinder device, 17 ... opening and closing member (window member) ), 18 ... Solenoid valve, 19 ... Drive motor, 20 ... Rotating cam, 20a, 20b, 20c ... Cam surface, 20 '... Cylindrical groove cam, 21 ... Cam follower, 22 ... Power transmission mechanism, 22a ... Transmission part, 22b ... Transmission unit, 22c ... Other cam mechanism, 23 ... Position detection sensor, 24 ... Control device.

Claims (6)

  An apparatus for manufacturing a self-supporting cable, wherein the outer periphery of a cable body and a suspension line is integrally covered with an insulating resin, and has a constricted portion comprising a neck portion and a window portion between the cable body and the suspension line, wherein the neck portion and the window An apparatus for manufacturing a self-supporting cable, wherein a cam mechanism is used for advancing and retracting a window member for forming a portion.   The self-supporting cable manufacturing apparatus according to claim 1, wherein the cam mechanism includes a control device that changes a cam rotation speed according to a rotation position of the cam.   3. The self-supporting cable manufacturing apparatus according to claim 1, wherein an AC servo motor is used for rotationally driving the cam mechanism.   A method of manufacturing a self-supporting cable in which a cable body and an outer periphery of a suspension line are integrally covered with an insulating resin, and a constriction portion including a neck portion and a window portion is formed between the cable body and the suspension wire, the neck portion and A method of manufacturing a self-supporting cable, wherein the window portion is formed by a window member that is advanced and retracted by a cam mechanism.   5. The method of manufacturing a self-supporting cable according to claim 4, wherein the cam mechanism changes a cam rotation speed in accordance with a rotation position of the cam, and adjusts and sets longitudinal lengths of the neck portion and the window portion. .   6. The method of manufacturing a self-supporting cable according to claim 5, wherein a speed of the window member advancing / retreating operation is constant regardless of a cable manufacturing linear velocity.

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