JP2009235605A - System and method for producing stranded wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make complicated arithmetic processing unnecessary in tension control of each wire when producing a stranded wire, and to prevent the reduction of life and thermal damage by the heat of a structure part. <P>SOLUTION: A tension-imparting mechanism 4 for imparting the tension to each wire 1 when fed to a twisting machine 2 regulates the tension by stretching each wire 1 by a resilient body 6 at a constant power, and reducing the force by the resilient body 6 by a power-reducing means 7. A control system 5 of the power-reducing means 7 controls so that when each wire 1 travels at a regular traveling speed, the reduction by the power-reducing means 7 may be zero, and when the traveling speed is gradually increased from zero to the regular traveling speed at the start of the operation, the reduction may be gradually reduced from the maximum to zero. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The invention of the present application relates to a stranded wire manufacturing system and a stranded wire manufacturing method in which a plurality of strands are bundled and twisted.

For example, most electric wires currently used are manufactured by bundling a plurality of strands and twisting them together. This is because the strength and the flexibility can be increased by using a twisted bundle of a plurality of thin wires rather than a single thick wire. A twisted wire manufacturing system for manufacturing such a twisted wire uses a twisting wire machine (twist bucher) that bundles and twists a plurality of strands.
JP 2000-265382 A

In the production of stranded wire, as taught in Japanese Patent Application Laid-Open No. 2000-265382, in order to obtain a high quality stranded wire by uniformizing the finished state of the stranded wire, an appropriate tension is applied to each strand during twisting. It is necessary to give According to this gazette, the number of rotations of the stranding machine is detected, and an appropriate tension value corresponding to the detected value is calculated and given to each strand.
However, the calculation processing for calculating an appropriate tension value according to the number of rotations of the stranding machine at that time tends to be complicated, and the cost for configuring the calculation unit increases or the control responsiveness is poor. There is a problem that becomes.

  In this publication, a torque motor is connected to an arm having a tension pulley attached to the tip via a powder clutch. When a large tension is applied, the torque of the torque motor is transmitted by connecting the powder clutch, and when a small tension is applied, the powder clutch is slightly disconnected and the torque generated by the torque motor is transmitted while being weakened. That is, the strength of the applied tension is controlled by always operating the torque motor and the powder clutch and controlling the degree of connection / disconnection of the powder clutch.

  However, in this method, the rotating bow rotates at the highest speed when the apparatus is in steady operation, and therefore the greatest tension needs to be applied to each strand. In the technique of this publication, the maximum load is applied to the torque motor and the powder clutch in the state of steady operation. With such a configuration, the load loss (energy consumption) of the torque motor and the powder clutch is large, which increases the running cost. In addition, high power consumption is also a problem from the viewpoint of protecting the global environment.

Particularly problematic is when the device is used in a relatively hot place. Along with the relocation of production bases overseas, stranded wire machines are also increasingly used overseas, and more often in countries with high temperatures near the equator. When used in such a high temperature environment, the torque motor and powder clutch are used for a long time under high load conditions. There are problems that make it unusable.
In this publication, during steady operation, the value of the rotational speed of the stranding machine is fed back to control the position of the tension pulley. Such a closed loop control system tends to be complicated in configuration, and it is difficult to ensure sufficient positional accuracy and responsiveness.

  The present invention has been made in order to solve such problems, and in the production of stranded wire that performs control to give an optimum tension to each strand, complicated arithmetic processing is not required, and the mechanism portion This element has the significance of preventing the life of the element from being shortened by heat or being damaged by heat.

In order to solve the above problems, the invention described in claim 1 of the present application includes a stranding machine that bundles and twists a plurality of strands, and a wire feeder that sends out and supplies each strand to the stranding machine. A stranded wire manufacturing system,
The wire feeder is provided with a tension applying mechanism that applies tension to each strand when supplied to the stranding machine,
The tension applying mechanism includes an elastic body that pulls each element wire with a constant force, and a reducing means that adjusts a tension applied to each element element by reducing the force generated by the elastic body.
The reducing means is provided with a control system for controlling the magnitude of the reducing force,
The control system sets the reduction force by the reducing means to zero when each strand is sent at the steady running speed, and when the running speed of each strand is gradually increased from zero to the steady running speed at the start of operation. Has a configuration in which the control is performed to gradually reduce the reduction force from the maximum to zero.
In order to solve the above-mentioned problem, the invention according to claim 2 is the configuration according to claim 1, wherein the control system is configured to reduce the traveling speed of each strand from the steady traveling speed to zero when the operation is stopped. Has a configuration in which the reduction is gradually increased from zero to perform the maximum control.
In order to solve the above-mentioned problems, the invention according to claim 3 is the configuration according to claim 1 or 2, wherein the tension applying mechanism includes a tension roller on which each strand sent to the stranding machine is hooked, and a tension roller. An arm having a roller fixed to one end and a rotating rod fixed to the other end of the arm,
The power reducing means includes a power reducing motor and a torque transmitter that transmits torque generated by the power reducing motor to the rotating rod;
The torque transmitter includes a first member that is rotationally driven by a reducing motor, and a second member that is opposed to the first member in a non-contact manner and is fixed to the rotating rod,
A magnet is provided on one of the first member and the second member, and the other member is formed of a magnetic material.
When the first member is rotated by the motor for reducing force, the torque transmitter attracts the first and second members to each other by the primary magnetic flux generated by the magnet and the secondary magnetic flux generated by the eddy current generated by the primary magnetic flux. And having a configuration in which torque is transmitted.
Moreover, in order to solve the said subject, invention of Claim 4 was equipped with the strand wire machine which bundles and twists several strands, and the wire feeder which sends out and supplies each strand to a strand wire machine A stranded wire manufacturing system,
The wire feeder is provided with a back tension applying mechanism that applies a background tension to each strand by driving a tension pulley on which each strand is hooked when supplied to the stranding machine, and a back tension applying mechanism. And a control system for controlling the magnitude of the tension to be applied,
The control system controls the back tension applying mechanism so that a steady background tension is applied when each strand is sent at a steady running speed, and the running speed of each strand is steady from zero at the start of operation. When the speed is gradually increased up to the speed, the back tension applying mechanism is controlled to prevent plastic deformation or breakage of each strand by applying a background tension smaller than the steady value to each strand. Have
Moreover, in order to solve the said subject, invention of Claim 5 is a strand manufacturing method which manufactures a strand by bundling and twisting a some strand, Comprising: A plurality of strands are bundled and twisted together While using a stranded wire machine and a wire feeder that feeds and supplies each strand to the stranded wire machine,
When each strand is sent to the stranding machine at a steady running speed, a certain tension is given to each strand by the elastic body,
When the running speed of each strand is gradually increased from zero to the steady running speed at the start of operation, it is a method to give each strand in a state where the force by the elastic body is reduced,
It has a configuration in which the force reduction by the elastic body is the largest when the movement of each strand is started, then gradually decreased, and the reduction is made zero when the steady traveling speed is reached.
Moreover, in order to solve the said subject, invention of Claim 6 is a twisted-wire manufacturing method which manufactures a strand by bundling a plurality of strands and twisting them, and bundling a plurality of strands together While using a stranded wire machine and a wire feeder that feeds and supplies each strand to the stranded wire machine,
It is a method of applying a background tension to a strand by driving a tension pulley on which each strand is hooked when being supplied to a stranding machine,
When each strand is sent at a steady running speed, a steady background tension is applied, and when the running speed of each strand is gradually increased from zero to the steady running speed at the start of operation, the steady value By applying a smaller background tension to each strand, it has a configuration that prevents plastic deformation or breakage of each strand.

As described below, according to the invention described in claim 1 of the present application, even if the device is used in any region of the world, such as a tropical region or a cold region, a stable steady tension without any fine adjustment. Can be given. In addition, there is no problem that the elements of the mechanism part have a life span or are damaged by heat in a short time due to heat. Furthermore, since energy consumption is reduced, it is suitable from the viewpoint of consideration for the global environment.
Further, according to the invention described in claim 2, in addition to the above effect, there is no problem that the configuration of the signal processing unit becomes complicated or the responsiveness of the control becomes worse.
According to the invention described in claim 3, in addition to the above effect, a non-contact type torque transmitter using a magnet for torque transmission in the reducing means is employed, so that wear due to heat and thermal damage are prevented. The problem is further avoided.
Further, according to the invention described in claim 4 or 5, in addition to the above effect, even when a thin strand is used, it is not necessary to sacrifice the productivity by reducing the back tension as in the prior art. For this reason, a stranded wire can be manufactured with high productivity.

Next, the best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described.
FIG. 1 is a schematic front view of a stranded wire manufacturing system according to an embodiment of the present invention. The stranded wire manufacturing system shown in FIG. 1 includes a stranded wire machine 2 that bundles and twists a plurality of strands 1, and each wire feeder 3 that sends out and supplies each strand 1 to the stranded wire machine 2. .

Although only two wire feeders 3 are shown in FIG. 1, the number of the wire wires 1 to be bundled is provided. Each wire feeder 3 supplies the strand 1 to the stranded wire 2 while giving a predetermined tension to the strand 1. In addition, the strand 1 itself bundled may be a stranded wire. That is, there may be a case where a plurality of strands obtained by bringing together a plurality of strands are prepared and further twisted.
Each wire feeder 3 includes a feed bobbin 31 around which the wire 1 is wound, a feed guide pulley 32 that guides the sent wire 1, and a tension pulley that applies a predetermined tension to the sent wire 1. And a tension applying mechanism 4 including 41. The tension applying mechanism 4 is provided with a control system (not shown in FIG. 1) for controlling the magnitude of the tension applied to each strand 1.

  The strand wire machine 2 includes an entrance guide 21 provided at a position where the strands 1 are bundled, a rotating bow 22 for twisting the strands bundled by the entrance guide 21 (hereinafter referred to as a bundled wire) 11, And an outlet guide 23 through which a strand 12 (hereinafter referred to as a stranded wire) 12 twisted by a rotary bow 22 is sent out. The stranded wire machine 2 also has a function of winding and collecting the twisted wire 12, and drives the winding bobbin 24 that winds the twisted wire 12 sent out from the outlet guide 23 and the winding bobbin 24. A take-up motor 27 is provided.

The rotary bow 22 is a bow-shaped member, and is rotated by a rotation mechanism (not shown). In this embodiment, the rotation axis by the rotation mechanism is in the horizontal direction. As shown in FIG. 1, the rotary bow 22 has a shape that is bent in a direction perpendicular to the horizontal rotation axis.
The rotary bow 22 has a through guide (not shown in FIG. 1) that guides through the bundle line 11 along its arcuately bent shape. A number of through guides are provided at regular intervals along the direction in which the rotary bow 22 extends.

One end of the rotary bow 22 is located near the entrance guide 21 and the other end is located near the exit guide 23. The strands 1 that have become bundled wires 11 bundled by the entrance guide 21 are inserted into the through guides of the rotary bow 22 and then reach the exit guide 23.
In addition, the entrance guide 21 is cylindrical, and each strand 1 is inserted through the inside. The outlet guide 23 is also cylindrical, and the twisted wire 12 is inserted through the outlet guide 23. The entrance guide 21 and the exit guide 23 are on the same horizontal line, and the rotation axis of the rotary bow 22 is located on this line.

  The entrance guide 21 is provided with a bundle pulley 25. The bundling pulley 25 is a pulley that follows a horizontal axis perpendicular to the rotation axis of the rotary bow 22. On the other hand, the outlet guide 23 is provided with a twist pulley 26. The twist pulley 26 is also a pulley that follows a horizontal axis perpendicular to the rotation axis.

When the rotating bow 22 is rotated by a rotating mechanism (not shown), the rotating bow 22 is in a state of partitioning a space area like a barrel. The take-up bobbin 24 is arranged in this space region as shown in FIG. The take-up bobbin 24 is provided with a take-up motor 27. In this embodiment, the take-up motor 27 performs take-up by rotating the take-up bobbin 24 around a rotation axis that is perpendicular to the rotation axis of the rotary bow 22 and in a horizontal direction. Yes.
A traverse guide roller 28 is provided between the winding bobbin 24 and the twist pulley 26. The traverse guide roller 28 is for periodically changing the position at which the twisted wire 12 enters the take-up bobbin 24, thereby eliminating the uneven winding state of the take-up bobbin 24.

  In the stranded wire manufacturing system shown in FIG. 1, each delivery bobbin 31 around which a predetermined amount of the wire 1 is wound is mounted on each wire feeder 3. Then, the strands 1 are manually pulled out from each delivery bobbin 31 and bundled, hooked on the bundle pulley 25 while being inserted into the entrance guide 21, and attached to the rotary bow 22. That is, the bundled wire 11 is pulled out to the position of the outlet guide 23 along the rotary bow 22 while being sequentially inserted into the through guide. The bundled wire 11 is inserted into the outlet guide 23 and hooked on the twist pulley 26, and the tip is fixed to the take-up bobbin 24. In this state, the operation preparation for the apparatus is completed. By operating each motor in this state, the apparatus operates and the twisted wire 12 is wound around the winding bobbin 24.

  That is, when the winding motor 27 rotates, the wire 1 is pulled out from the sending bobbin 31 of each wire feeder 3. Each strand 1 is bundled at the position of the bundling pulley 25, proceeds along the rotary bow 22, reaches the take-up bobbin 24 through the twist pulley 26, and is taken up. At this time, since the rotating mechanism rotates the rotating bow 22, the bundled wire 11 is twisted twice. That is, the bundling wire 11 does not rotate at the bundling pulley 25, but rotates with the rotation of the rotary bow 22. Therefore, twisting is first performed at this portion. Further, while the bundled wire 11 advances while rotating together with the rotary bow 22, the rotation of the bundled wire 11 is restricted (not rotated) at the twist pulley 26. Therefore, another twist is performed here. A twisting machine that performs twisting twice in this way is called a Double Twist Buncher.

In the above-described stranded wire manufacturing system, when the strands 1 are bundled and twisted, it is necessary to apply an appropriate tension to each strand 1. Hereinafter, this point will be described with reference to FIG. FIG. 2 is a schematic front view illustrating the necessity of tension control.
FIG. 2 schematically shows the rotating bow 22 and the bundled wire 11 when the apparatus is operating. As shown in FIG. 2, the rotary bow 22 is a hollow member, and a through guide 221 is formed therein. The through guide 221 includes a pair of protrusions that protrude inward and face each other. A number of through guides 221 are provided at regular intervals along the longitudinal direction of the rotary bow 22. Further, an opening 222 for reducing the overall weight of the rotary bow 22 is formed at a position between each through guide 221 and the through guide 221.

  During operation of the apparatus, the bundle wire 11 rotates together with the rotary bow 22, so that a centrifugal force acts on the bundle wire 11. At this time, if the tension is small, the influence of centrifugal force increases, and the bundled wire 11 bends so as to protrude outward from the opening 222 between the through guides 221 as shown in FIG. In this case, the bundle line 11 advances while rubbing against the edge of the projection on the outer side of each through guide 221, and the bundle line 11 may be worn or damaged. Further, since the bundled wires 11 are caught by the respective through guides 221, even if the bundled wires 11 are pulled by the take-up bobbin 24, the bundled wires 11 may be unwound and an excessive force may be applied to break the bundled wires 11.

On the other hand, if the tension is too large, the influence of the centrifugal force is relatively reduced. Therefore, as shown in FIG. It will proceed while rubbing against the edge of. Also in this case, the bundled wire 11 is likely to be worn or damaged.
Ideally, as shown in FIG. 2 (3), it is desirable that the bundle line 11 proceeds without contacting any edge of each through guide 221. In order to realize the state as shown in FIG. 2 (3) (or to make it close to that state), tension control is performed.

  The tension control is performed by experimentally obtaining in advance the magnitude of the tension that results in the state of FIG. 2 (3) and operating the control system so that the state is reproduced. However, the magnitude of the tension in the state of FIG. 2 (3) is not always constant. That is, the required tension changes depending on the winding speed (traveling speed of the bundled wire 11) by the winding bobbin 24 and the rotational speed of the rotary bow 22.

  Because of the necessity as described above, the stranded wire manufacturing system of the embodiment includes a tension applying mechanism 4 that applies tension to each element wire 1. The tension applying mechanism 4 is provided with a control system 5 for controlling the magnitude of the tension to be applied. The tension applying mechanism 4 includes an elastic body that applies an elastic force to each tension pulley 41 in the direction in which the tension is increased. Further, there is provided a reducing means 7 for applying a force to each tension pulley 41 in a direction to reduce the tension against the elastic force of the elastic body, and the control system 5 has a magnitude of the reducing force of the reducing means 7. Can be controlled.

  First, the configuration of the tension applying mechanism 4 will be described with reference to FIG. FIG. 3 is a schematic perspective view of the tension applying mechanism 4. As shown in FIG. 3, the tension pulley 41 is fixed to one end of the arm 42. The other end of the arm 42 is fixed to one end of the rotating rod 43. The rotating rod 43 is in a horizontal posture. The arm 42 extends upward from one end of the rotating rod 43, and a tension pulley 41 is rotatably fixed to the tip thereof. The tension pulley 41 rotates (swings) within a predetermined angular range around the central axis of the rotating rod 43 when the rotating rod 43 rotates.

The other end of the rotating rod 43 is provided with a fixed torque introducing portion 44 for introducing a fixed torque by an elastic body and a reducing torque introducing portion 45 for introducing a reducing torque by the reducing means 7. In FIG. 3, the reducing torque introducing portion 45 is partially broken in order to facilitate understanding of the structure.
As the elastic body, a coil spring 6 is employed as shown in FIG. The coil spring 6 is provided in a posture in which the central axis is vertical. The coil spring 6 is fixed to the fixed frame 60.
An adjustment screw 61 is provided at the lower end of the coil spring 6. The adjustment screw 61 is screwed into the lower end of the fixed frame 60 and adjusts the pulling force of the coil spring 6 by pulling the lower end of the coil spring 6. By operating the adjusting screw 61, the tension is adjusted so that the state shown in FIG.

  The fixed torque introducing portion 44 is mainly composed of a fixed torque disk 441 connected to the other end of the rotating rod 43, and a connecting wire 442 constructed by connecting the fixed torque disk 441 and the coil spring 6. Yes. The fixed torque disk 441 is provided coaxially with the rotating rod 43. A groove is formed on the peripheral surface of the fixed torque disk 441, and a connecting wire 442 is installed in the groove. One end of the connecting wire 442 is fixed to a fixing portion provided on the fixed torque disk 441. The other end of the connecting wire 442 is connected to the upper end of the coil spring 6. The connecting wire 442 is hooked on the guide pulley 443.

  The reduction means 7 decelerates the output of the torque transmitter 71 provided in the reduction torque introducing portion 45, the reduction motor 72 that generates torque transmitted via the torque transmitter 71, and the reduction motor 72. The speed reducer 73 and the like are configured. In the present embodiment, the torque transmitter 71 is of a type that efficiently transmits torque using eddy currents. FIG. 4 is a schematic cross-sectional view showing the structure of the torque transmitter 71 shown in FIG.

The torque transmitter 71 includes a drive rod 711 provided through the speed reducer 73, a drive flange 712 formed at the tip of the drive rod 711, and a driven disk 713 provided to face the drive flange 712. ing.
The driven disk 713 is fixed to the rotating rod 43. The drive rod 711 is arranged coaxially with the rotating rod 43. The drive flange 712 is a disk-shaped part formed at the tip of the drive rod 711.

The tip of the drive rod 711 slightly protrudes from the drive flange 712 as shown in FIG. On the other hand, the driven disk 713 has a recess formed in the center of the surface facing the drive flange 712, and the tip of the drive rod 711 is located in this recess. A bearing 714 is provided between the recess and the tip of the drive rod 711 as shown in FIG.
Note that the drive flange 712 and the driven disk 713 are opposed to each other at a very narrow interval without contact. The “very narrow interval” is, for example, about 0.2 mm to 1 mm. When the interval is narrow, there is a merit that even a weak magnet is sufficient, but there is a drawback that high accuracy is required for the accuracy of the mechanism for rotation and the dimensional accuracy of parts. In addition, when the interval is wide, it is sufficient to use a stronger magnet. However, when the interval is too wide, there is a drawback that a stronger magnet than the limit must be used.

  The drive flange 712 has an annular shape, and the driven disk 713 has substantially the same outer diameter as the drive flange 712. A surface facing the drive flange 712 of the driven disk 713 (hereinafter simply referred to as a facing surface) is provided with a plurality of magnets 715 that play a major role in torque transmission. In this embodiment, a permanent magnet 715 is employed for each magnet 715. Each magnet 715 has a small disk shape with a diameter of about 5 to 30 mm, and a strong neodymium magnet having a surface magnetic flux density of about 1.0 to 1.5 T, for example, is employed. Ferrite magnets may be used.

  On the other hand, a current collecting plate 716 is provided on a surface of the drive flange 712 facing the driven disk 713 (hereinafter simply referred to as a facing surface). The current collecting plate 716 is made of a good conductor such as copper. The current collecting plate 716 is fitted in a recess provided on the facing surface of the drive flange 712 and is flush with the facing surface. FIG. 5 is a schematic perspective view showing the positional relationship between each magnet 715 and current collecting plate 716 shown in FIG.

  As shown in FIG. 5, the magnets 715 are provided at equal intervals on a circumference coaxial with the rotating rod 43. The current collecting plate 716 is an annular member and is also coaxial with the rotating rod 43. The width of the current collecting plate 716 (the difference between the inner diameter and the outer diameter) is approximately equal to or slightly larger than the diameter of each magnet 715. In FIG. 5, eight magnets 715 are illustrated, but more magnets are actually arranged. Although the torque transmission efficiency increases as the number of magnets 715 increases, the efficiency saturates at a certain number, so it is useless to arrange more.

  Further, as shown in FIG. 5, the magnets 715 are arranged so that adjacent ones have opposite magnetic poles, although the front side has N poles and the back side has S poles. For this reason, the magnetic flux 717 is generated so as to connect the magnets 715. The magnetic flux 717 passes through the current collecting plate 716 of the drive flange 712 and reaches the adjacent magnet 715 via the inside of the drive flange 712. The drive flange 712 is made of a material having high magnetic permeability such as pure iron.

As shown in FIG. 4, a magnetic flux confinement plate 718 is fixed to the periphery of the facing surface of the driven disk 713. The magnetic flux confinement plate 718 is for preventing the magnetic flux generated by each magnet 715 from leaking to the outside (the side away from the central axis of the rotating rod 43). The magnetic flux confinement plate 718 is formed of a non-magnetic material such as aluminum and has a cylindrical shape that surrounds the periphery of the facing surface of the driven disk 713 by 360 degrees. The magnetic flux confinement plate 718 has a protrusion that protrudes inward, and a plurality of openings for the magnet 715 are provided in the protrusion. Each magnet 715 is provided in a state of being fitted in each opening.
The driven disk 713 is attached to a frame (not shown) via a bearing (not shown). The driven disk 713 is rotatably supported by the frame together with the rotating rod 43 and the like.

The operation of the mechanism portion of the reducing means 7 having the above-described configuration will be described below.
In FIG. 3, the coil spring 6 always pulls the connecting wire 442 with a constant force, and a fixed torque (fixed torque) is applied to the fixed torque disk 441 in the direction indicated by the arrow A in FIG. . By this fixed torque, a force that swings in the direction of arrow A is applied to the arm 42 and the tension pulley 41, whereby a constant tension is applied to the strand 1. This state is a state in which the tension of the wire 1 and the fixed torque by the coil spring 6 are balanced, and the tension pulley 41, the rotating rod 43, the fixed torque disk 441 and the like are stationary.

When the reduction motor 72 operates in this state, the output of the reduction motor 72 is transmitted to the drive rod 711 via the speed reducer 73, and the drive rod 711 rotates at a certain rotational speed. Along with this, the drive flange 712 also rotates. The direction of rotation of the drive flange 712 is opposite to the fixed torque.
Although the driven disk 713 is in a state where the magnets 715 on the opposing surface attract the drive flange 712, it is not completely magnetically coupled and there is a fixed torque, so even if the drive flange 712 rotates. It does not rotate integrally with this. However, like the magnetic clutch, “slip” occurs, and the torque in the same direction as the rotation of the drive flange 712 is applied to the driven disk 713. Since the torque at this time is in the opposite direction to the fixed torque applied by the fixed torque motor, it is hereinafter referred to as “reverse torque”. In FIG. 3, the reverse torque is indicated by an arrow B.

  The magnitude of the reverse torque can be adjusted by the rotational speed of the drive flange 712. That is, when the drive flange 712 rotates with respect to each magnet 715 of the driven disk 713, the attractive force generated by each magnet 715 with respect to the drive flange 712 acts to rotate the driven disk 713 in the same direction. Further, since the driven disk 713 does not rotate with respect to the drive flange 712, the number of flux linkages by the magnets 715 changes, and an eddy current is generated in the current collecting plate 716. The eddy current generates a secondary magnetic flux different from the primary magnetic flux by each magnet 715, and the attraction force by this secondary magnetic flux also generates a torque to rotate the driven disk 713 following the drive flange 712.

The amount of torque due to the primary magnetic flux and the amount of secondary magnetic flux depend on the rotational speed of the drive flange 712, and the reverse torque increases as the rotational speed of the drive flange 712 increases. Therefore, the magnitude of the reverse torque can be adjusted by adjusting the output of the motor 72 for reducing force, and as a result, how much the fixed torque is reduced can be adjusted.
For example, when each magnet 715 has a surface magnetic flux density of about 1.0 to 1.5 T and the drive flange 712 is rotated at a rotation speed of about 170 rpm, a reverse torque of about 700 g is applied to the driven disk 713. Can be given to. The inventor's experiment has confirmed that the rotational speed of the drive flange 712 is linearly proportional to the reverse torque, and that the reverse torque increases linearly when the rotational speed is increased linearly. .

  It should be noted that stoppers 431 and 432 are provided for restricting the position of the tension pulley 41 when the apparatus is completely stopped. The stoppers 431 and 432 are configured to restrict the position of the tension pulley 41 when a stop bar 444 provided on the fixed torque disk 441 comes into contact therewith. When the operation of the apparatus is completely stopped, the force of the coil spring 6 is only applied to the arm 42 via the rotating rod 43. At this time, one stopper 431 stops the arm 42 at a predetermined limit position. It has become. The other stopper 432 restricts the rotation of the arm 42 in the opposite direction.

Next, the control system 5 will be described.
The control for the reduction motor 72 described above is basically an open loop sequence control. The control system 5 includes an input unit 51 that inputs data from the outside, an arithmetic processing unit 52 that creates a sequence according to the input data, an output unit 53 that outputs a control signal according to the created sequence, and the like. .

  FIG. 6 is a schematic diagram showing the sequence control of the reduction motor 72. In the present embodiment, at least the following three values are given as set values. One is an output value (hereinafter referred to as a full output value) for setting the tension applied to the wire 1 to a set minimum value. The other is the time from the full output value until the output becomes zero when the apparatus starts operation (hereinafter referred to as a transition time at the start). The remaining one is the time from the output zero to the full output value when the operation of the apparatus is stopped (hereinafter referred to as “transient time at stop”).

  In the present embodiment, as shown in FIG. 6, when the main switch of the apparatus is turned on, a standby state is set, and a control signal is output to the reduction motor 72 so that a full output value is output. When the operation of the apparatus is started, the output value of the reducing motor 72 gradually decreases linearly, and a control signal is output so that the output value becomes zero when the set start-up transient time elapses. Is output. Also, when the device stops operating, the output value is increased linearly from zero, and a control signal is output so that the output value becomes a full output value when the set transient time at stop has elapsed. .

  Each data of the full output value, start time elapsed time, and stop elapsed time in the control is input from the input unit 51 and stored in a memory (not shown). The arithmetic processing unit 52 generates the control signal according to the input data. The generated control signal is sent from the output unit 53 to the reducing motor 72.

Next, the relationship between the control of the traveling speed and twisting speed of each strand 1 and the tension control will be described with reference to FIG. 6 again.
As described above, in the stranded wire machine 2 of the embodiment, the twisting is performed twice in total at the entrance guide 21 and the exit guide 23. The twist density of the finished stranded wire (how many strands are formed per unit length) depends on the traveling speed of each strand 1 (hereinafter simply referred to as traveling speed) and the rotational speed of the rotating bow 22 (hereinafter referred to as Determined by the relative relationship with the rotational speed of the twist. When the traveling speed is constant, the twist becomes dense if the twist rotational speed is increased, and becomes rough if the twist rotational speed is lowered. When the rotational speed of the twist is constant, the twist becomes rough when the traveling speed is increased, and becomes dense when the travel speed is decreased.

  The density of the twist is one of the specification values of the twisted wire as a product, and is determined in advance. The optimum traveling speed and twist rotational speed for achieving a predetermined twist density are selected in advance and set as the optimum operating conditions of the apparatus. The control system 5 is also configured to send a control signal to a winding motor and a twist rotating motor for rotating the rotary bow 22.

  As for the traveling speed and the twisting rotational speed, the speed (steady traveling speed, steady twisting rotational speed) when the apparatus is in steady operation is determined in advance and input from the input unit 51. In addition, the time (starting transient time) from the start of operation until reaching the steady traveling speed or the steady twist rotational speed is determined in advance and input from the input unit 51. Furthermore, when the operation of the apparatus is stopped, the time until the steady traveling speed and the steady twisting speed are set to zero (transient time at the time of stopping) is determined in advance, and is input from the input unit 51.

  Normally, the start time transient time and the stop time transient time for the traveling speed and the twist rotation speed are the same as the start time transient time and the stop time transient time for the power reducing motor 72 described above. That is, as shown in FIG. 6, after the operation of the apparatus is started, the timing when the start-up transient time elapses and the output of the reduction motor 72 becomes zero, and the traveling speed and the twisting rotational speed become the steady speed. The timing is the same. In addition, the timing at which the output of the reduction motor 72 becomes full after the operation stop command for the apparatus is issued is the same as the timing at which the traveling speed and the twisting rotational speed become zero.

This is the end of the description of each part of the apparatus, and the overall operation of the apparatus will be described. The following description is also an explanation of the method for manufacturing a stranded wire of the embodiment.
When starting the operation of the apparatus, the operator sets each strand 1 to the stranding machine 2. That is, the operator pulls the wire 1 from the delivery bobbin 31 of each wire feeder 3 and passes through the entrance guide 21, the rotary bow 22, and the exit guide 23 in this order while being hooked on the tension pulley 41 and the feed guide pulley 32. Finally, the tip is connected to the take-up bobbin 24.

  When the setting is completed for all the strands 1, the main switch of the apparatus is turned on. As a result, the reduction motor 72 starts operating, and rotates the drive flange 712 with the full output value. As a result, reverse torque is applied to the rotating rod 43 via the torque transmitter 71, the arm 42 is pulled back from the limit position, and stops at the standby position where the tension becomes a predetermined minimum value.

  In this state, the worker inputs an operation start command for the apparatus from the input unit 51 to start the operation of the apparatus. As described above, the winding motor 27 starts to rotate and gradually increases the traveling speed of each strand 1. At the same time, the twist rotating motor also starts to operate and gradually increases its speed. At the same time, the reducing means 7 starts to operate and gradually increases the reverse torque.

  When the same start time transition time has elapsed, the winding motor reaches the steady rotational speed, and the traveling speed also reaches the steady traveling speed. At the same time, the twist rotational speed reaches the steady twist rotational speed, and the output of the reducing motor 72 becomes zero at the same timing. Accordingly, each tension pulley 41 is positioned at a steady state position, and a steady value of tension is applied to each strand 1. As described above, the steady-state tension is set by operating the adjusting screw 61 so that the state shown in FIG.

  The apparatus continues to operate at a steady traveling speed and a steady twist rotation speed, and is twisted as described above, and the twisted wire 12 is wound around the take-up bobbin 24 one after another. If the operation is continued for winding the twisted wire 12 of a predetermined length, an operation stop command is issued. Thereafter, as described above, the traveling speed and the twisting rotational speed become zero over the same stop-time transition time, and the reduction motor 72 increases the output to the full output value. Thereby, it will be in the state which operation stopped. The tension pulley 41 returns to the standby position. When the operation of the apparatus is completely stopped, at least each wire 1 is removed from each tension pulley 41 and the main switch is turned off. As a result, the tension pulley 41 reaches the limit position from the standby position and stops by the stopper 431.

For example, when a copper wire having a diameter of about 0.5 mm is used as the strand 1, for example, when a tension exceeding 1 kg is applied, the strand 1 extends (plastic deformation). . Therefore, the tension value during steady operation is 1 kg.
In the above operation, the twist rotation may be performed after the traveling speed reaches the steady traveling speed. That is, at the beginning of operation, only the strands are bundled and sent, and the rotation of the rotary bow 22 may be started after confirming that the traveling speed of each strand has reached the steady traveling speed.

  In the stranded wire manufacturing system according to the embodiment related to the configuration and operation described above, the force reducing means 7 is provided only when the apparatus starts and stops when the fixed torque is given by the elastic body made of the coil spring 6. It is operated gradually, and the tension is gradually increased or decreased. When the apparatus is in a steady operation state, only a fixed torque by the elastic body is given. The restoring force of an elastic body generally has no temperature dependence. Therefore, even if the device is used in any region of the world such as a tropical region or a cold region, a constant and steady tension can be given without any fine adjustment.

  In particular, when the apparatus is in steady operation, it is only the elastic body that generates force for tension control. Therefore, there is no problem that the elements of the mechanism part are shortened in life in a short time or thermally damaged due to heat as in the prior art. In the configuration in which the steady tension is applied while the motor is constantly operated and controlled, energy consumption for releasing carbon dioxide gas is always performed. However, the steady tension by the elastic body does not consume such energy, and the earth It is also suitable from the viewpoint of environmental considerations.

  Further, at the start and stop of the operation of the apparatus, the tension is gradually increased or decreased by the reducing means 7, but this control also increases the output of the reverse torque motor gradually or linearly. Signal processing is simple because it is only reduced. For this reason, there is no problem that the configuration of the signal processing unit becomes complicated or the responsiveness of control deteriorates. Further, since the control is sufficient by open loop control, there is no problem that the configuration of the entire control system 5 becomes complicated.

In addition, since the non-contact type configuration using the magnet 715 is adopted as the torque transmitter 71 in the force reducing means 7, problems of wear due to heat and thermal damage are also avoided here. Further, since the torque is transmitted using the secondary magnetic flux caused by the eddy current, the efficiency is good and the energy efficiency of the reducing motor 72 is high. Since the current collecting plate 716 is provided, the efficiency of generating the secondary magnetic flux is increased, and the efficiency of torque transmission is also increased in this respect.
However, the use of the non-contact type torque transmitter 71 using the magnet 715 is not an essential condition of the present invention. A powder clutch may be used as in the above-mentioned publication, and other torque transmitters may be used. In the case where a non-contact type torque transmitter is used, a configuration may be adopted in which magnets are provided on both of the first and second members facing each other to attract each other.

Moreover, the structure of the said embodiment has the remarkable significance that manufacture of a strand wire can be performed with high productivity, even when a thinner strand is used. Hereinafter, this point will be described.
In the stranded wire manufacturing system, the most basic factor that determines the productivity is the traveling speed of the strand 1, and it is necessary to increase the traveling speed in order to increase the productivity. The rotational speed of the rotary bow 22 depends on the density at which the twist is formed (how many twists per unit length should be twisted). The twist density is predetermined as a product specification. In general, when the traveling speed is increased in order to increase productivity, it is necessary to increase the rotation speed of the rotary bow 22 in order to obtain a necessary twist density.

  On the other hand, when the traveling speed increases, it is generally necessary to increase the tension applied to the strand 1. As the traveling speed increases, as described above, the rotational speed of the rotary bow 22 increases in order to obtain the necessary twist density. When the strand 1 passes through the through guide 221 of the rotary bow 22, it tries to bulge outward by centrifugal force as described above. However, in order to obtain a high-quality stranded wire, it is necessary to suppress this bulge by applying tension. There is. As the rotational speed of the rotary bow 22 increases, the centrifugal force applied to the strand 1 also increases, so it is necessary to apply a larger tension to suppress swelling. Therefore, when increasing the traveling speed, it is necessary to increase the tension to be applied.

The main part of the tension during the above-described steady operation is a tension that is always applied by the tension pulley 41 during operation, and in this sense is called background tension (hereinafter abbreviated as back tension). In order to increase productivity, it is necessary to increase the traveling speed, and as a result, it is necessary to increase the set value of the back tension.
However, in order to increase the back tension, there is a limit in terms of the yield strength of the wire 1. If too much back tension is applied, plastic deformation such as extension of the wire 1 occurs, or the wire 1 breaks. The critical tension at the time of plastic deformation or disconnection is hereinafter referred to as limit tension. When the thick strand 1 is used, even if the strand 1 is run at the highest practical speed, plastic deformation and disconnection are rarely generated, and the back tension value is exclusively the performance of a rotating system such as a motor. Often determined from the standpoint of However, in the case of a stranded wire obtained by twisting very thin strands 1 like an electric wire used in an electronic device or a precision device, the traveling speed is limited by the limiting tension because the limiting tension is small.

  In this case, a particular problem in relation to productivity is that the back tension must be set much smaller than the limit tension in order to avoid plastic deformation and disconnection at the start of operation. Hereinafter, this point will be described with reference to FIG. FIG. 7 is a diagram showing the relationship between the back tension and the actual tension in the conventional stranded wire manufacturing system and the embodiment. In FIG. 7, (1) is the conventional one, and (2) is the embodiment.

  In FIG. 7, the back tension is shown by a solid line. This back tension is given by the tension pulley 41 pulling the wire 1. Further, in FIG. 7, the actual tension applied to the element wire 1 is indicated by a broken line. In the steady operation state, the actual tension is slightly larger than the back tension. The larger portion is the portion where the winding bobbin 24 is pulling the wire for winding. The value of the back tension is set so that the actual tension is sufficiently smaller than the limit tension.

  As shown in FIG. 7 (1), in the conventional stranded wire manufacturing system, the back tension is basically constant during the operation of the apparatus. And it controls according to the rotational speed of a rotary bow as needed like the above-mentioned gazette. Even if the back tension is constant, the actual tension applied to the strand is not always constant. That is, as shown in FIG. 7 (1), a large tension is applied to the strand 1 at the start of operation. This is because the strand 1 starts running from zero speed, and the winding bobbin 24 initially pulls the strand with a large force. That is, since the running of the strand starts from the state in which the tension pulley 41 pulls the strand 1 to apply the tension, the initial tension is considerably larger than the back tension. The actual tension decreases as the traveling speed approaches the steady traveling speed after the start of traveling, and when the traveling speed reaches the steady traveling speed, the actual tension is stabilized at a slightly larger value than the back tension.

Here, when the strand 1 having a small limit tension (that is, weak) is used, as shown in FIG. 7 (1), even when the back tension is set smaller than the limit tension, the actual travel is started. The tension applied to the arm may exceed the limit tension. In this case, since the plastic deformation or breakage occurs in the strand 1, as shown in FIG. 7 (1), the back tension is set to a smaller value, and the tension actually applied to the strand 1 at the start is less than the limit tension. It is done to make it smaller.
Decreasing the set value of the back tension means lowering the winding speed. That is, it means that productivity is lowered. That is, in the case of the wire 1 having a small limit tension, the set value of the back tension has to be lowered at the expense of productivity in order to avoid plastic deformation and disconnection.

  On the other hand, in the case of the stranded wire manufacturing system of the embodiment, there is substantially no such sacrifice. That is, as described above, in the embodiment, the force reducing means 7 is operated during the start transition time to reduce the fixed torque. Therefore, in the embodiment, as shown in FIG. 7 (2), the back tension gradually increases from the minimum value during the start-up transient time, and becomes a steady value and stabilizes when the start-up transient time elapses. Therefore, the tension actually applied to the wire 1 during the start transition time is smaller than the limit tension, and plastic deformation and disconnection do not occur. In other words, the initial value of the back tension is set so that the tension actually applied to the wire 1 at the start of operation is sufficiently smaller than the limit tension. As is apparent from the above description, this initial value is appropriately set according to the adjustment by the adjusting screw 61 and the full output value of the motor 72 for reducing force. The initial value may be zero (that is, a state where no tension is applied in the initial state).

As can be understood from the above description, according to the configuration of the embodiment, it is sufficient that the back tension at the time of steady operation is made smaller than the limit tension by a margin meaning “insurance”. Even when the thin wire 1 is used, there is no need to sacrifice the productivity by reducing the back tension as in the prior art. For this reason, a stranded wire can be manufactured with high productivity in the case of the thin strand 1.
In the above embodiment, the elastic body is the coil spring 6, but this is only an example, and the present invention can be implemented using another elastic body such as a leaf spring.
Note that the stranded wire manufacturing system and the stranded wire manufacturing method of the above-described embodiment are not limited to wire manufacturing, and can be used in principle when manufacturing stranded wire for other purposes.

1 is a schematic front view of a stranded wire manufacturing system according to an embodiment of the present invention. It is the front schematic diagram explaining the necessity of tension control. 3 is a schematic perspective view of a tension applying mechanism 4. FIG. It is the cross-sectional schematic which showed the structure of the torque transmitter 71 shown in FIG. FIG. 6 is a schematic perspective view showing the positional relationship between each magnet 715 and current collecting plate 716 shown in FIG. 4. It is the schematic shown about the sequence control of the motor 72 for reducing force. It is the figure shown about the relationship between the back tension and the actual tension in the strand wire manufacturing system of the past and embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Strand 2 Stranding machine 21 Entrance guide 22 Rotating bow 23 Exit guide 24 Winding bobbin 3 Wire feeder 31 Sending bobbin 4 Tension applying mechanism 41 Tension pulley 5 Control system 51 Input part 52 Arithmetic processing part 53 Output part 6 Coil spring 61 Adjustment screw 7 Reduction means 71 Torque transmitter 72 Reduction motor

Claims (6)

A stranded wire manufacturing system comprising a stranding machine that bundles and twists a plurality of strands, and a wire feeder that sends out and supplies each strand to the stranding machine,
The wire feeder is provided with a tension applying mechanism that applies tension to each strand when supplied to the stranding machine,
The tension applying mechanism includes an elastic body that pulls each element wire with a constant force, and a reducing means that adjusts a tension applied to each element element by reducing the force generated by the elastic body.
The reducing means is provided with a control system for controlling the magnitude of the reducing force,
The control system sets the reduction force by the reducing means to zero when each strand is sent at the steady running speed, and when the running speed of each strand is gradually increased from zero to the steady running speed at the start of operation. The stranded wire manufacturing system is characterized in that control is performed to gradually reduce the reduction force from the maximum to zero. When the running speed of each strand is reduced from the steady running speed to zero when the operation is stopped, the control system performs control to gradually increase the reduction force from zero to maximize it. The stranded wire manufacturing system according to claim 1, The tension applying mechanism includes a tension roller on which each strand sent to the stranding machine is hooked, an arm that fixes the tension roller to one end, and a rotating rod that is fixed to the other end of the arm.
The power reducing means includes a power reducing motor and a torque transmitter that transmits torque generated by the power reducing motor to the rotating rod;
The torque transmitter includes a first member that is rotationally driven by a reducing motor, and a second member that is opposed to the first member in a non-contact manner and is fixed to the rotating rod,
A magnet is provided on one of the first member and the second member, and the other member is formed of a magnetic material.
When the first member is rotated by the motor for reducing force, the torque transmitter attracts the first and second members to each other by the primary magnetic flux generated by the magnet and the secondary magnetic flux generated by the eddy current generated by the primary magnetic flux. The twisted wire manufacturing system according to claim 1, wherein torque is transmitted. A stranded wire manufacturing system comprising a stranding machine that bundles and twists a plurality of strands, and a wire feeder that sends out and supplies each strand to the stranding machine,
The wire feeder is provided with a back tension applying mechanism that applies a background tension to each strand by driving a tension pulley on which each strand is hooked when supplied to the stranding machine, and a back tension applying mechanism. And a control system for controlling the magnitude of the tension to be applied,
The control system controls the back tension applying mechanism so that a steady background tension is applied when each strand is sent at a steady running speed, and the running speed of each strand is steady from zero at the start of operation. When the speed is gradually increased up to the speed, the back tension applying mechanism is controlled so as to prevent plastic deformation or breakage of each strand by applying a background tension smaller than the steady value to each strand. Characteristic stranded wire production system. A stranded wire manufacturing method for manufacturing a stranded wire by bundling and twisting a plurality of strands, and a strand wire machine for bundling and twisting a plurality of strands, and feeding and supplying each strand to the strand wire machine It is a method of using a line transmitter,
When each strand is sent to the stranding machine at a steady running speed, a certain tension is given to each strand by the elastic body,
When the running speed of each strand is gradually increased from zero to the steady running speed at the start of operation, it is a method to give each strand in a state where the force by the elastic body is reduced,
Production of stranded wire, characterized in that the force reduction by the elastic body is the largest when each strand starts running, and then gradually decreases to zero when reaching the steady running speed Method. A stranded wire manufacturing method for manufacturing a stranded wire by bundling and twisting a plurality of strands, and a strand wire machine for bundling and twisting a plurality of strands, and feeding and supplying each strand to the strand wire machine It is a method of using a line transmitter,
It is a method of applying a background tension to a strand by driving a tension pulley on which each strand is hooked when being supplied to a stranding machine,
When each strand is sent at a steady running speed, a steady background tension is applied, and when the running speed of each strand is gradually increased from zero to the steady running speed at the start of operation, the steady value A method for producing a stranded wire, characterized in that plastic deformation or breakage of each strand is prevented by applying a smaller background tension to each strand.

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