JP2000144588A - Stranding method for multilayer stranded steel cord and system therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the subject stranding method and system therefor enabling easy and sure speed synchronism of two stranders collocated with each other even in case steel cord construction is varied. SOLUTION: This system works as follows: when the difference between the wire travel speed of a 1st strander for core strands and that of a 2nd strander for cords occurs, the tension of a core strand S wound on dancer roller device D is varied; then a mobile roller 22 is set in vertical motion which, in turn, is converted to rotary motion via a chain 27, a sprocket 28, and a gear 29, the rotary motion is then transduced into an electric signal which, in turn, is sent to the arithmetic logic unit in an electrical control section E; subsequently, an instruction is given to the driving motor 7 for the 1st strander A from the arithmetic logic unit, with the result that the revolutions of the driving motor 7 are properly corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a steel cord used as a reinforcing material for a rubber product such as a tire or a conveyor belt (hereinafter also referred to simply as a cord). The present invention relates to an improvement, and particularly to a method of efficiently performing a twisting process on a multi-layered steel cord.

[0002]

2. Description of the Related Art Conventionally, in manufacturing a multi-layer twisted steel cord, the inner layer (core) and the outer layer (sheath) are twisted in separate steps. That is, in the first step, the metal strands constituting the core are twisted to form a core strand,
Take up on reel. Next, in a second step, the metal strands constituting the sheath were aligned around the core strand, and these were twisted to produce a desired multi-layer twisted steel cord. However, in the above-mentioned conventional manufacturing method, the core strand is once wound on a reel,
There is a drawback that workability is poor because it is fed out in the next step.

A stranded wire device for solving the above-mentioned disadvantage is disclosed in, for example, Japanese Utility Model Publication No. Hei 3-11277. This is a mechanism in which a stranded wire machine for a core strand and a stranded wire machine for a cord are continuously arranged, and two stranded wire machines are driven by a single driving motor via a transmission shaft. The ratio of the number of revolutions of the two twisting machines is changed depending on the gear size (gear ratio), and the traveling speed of the core strand and the cord is synchronized. As a result, multi-layer twisted steel cord can be twisted in one process, shortening the process, eliminating the need for core strand winding reels, improving workability, and reducing equipment costs and electrical control costs. It is.

However, in the twisting device as disclosed in Japanese Utility Model Publication No. Hei 3-11277, a mechanism for mechanically synchronizing the rotation speed and the linear speed of the two twisting machines with gears is used. However, since the gear ratio is determined by the theoretical calculation formula, errors in the rotation speed and the linear speed of the two twisting machines are unavoidable, and tuning is difficult. That is, when the gear ratio of the core strand twisting machine and the cord twisting machine does not exactly match, an error occurs in the linear speeds of the two. And, when the linear speed of the core strand is faster than the linear speed of the cord,
The core strand becomes a slightly slack steel cord,
On the other hand, when the core strand has a lower linear velocity than the cord linear velocity, the core strand gradually becomes tense and eventually breaks.

In the case of producing steel cords having different twist configurations, the gear ratio of the above-mentioned twisting machine must be changed one by one, and it becomes necessary to replace gears and prepare various types of gears. I was

[0006]

SUMMARY OF THE INVENTION As described above, according to the present invention, a core strand led out of a first stranding machine and a plurality of side strands unreeled from a side strand unreeling device are assembled by an assembly guide. After that, in the method and apparatus for twisting a multi-layered twisted steel cord to be introduced into the second twisting machine and twisted, the line speed of the two twisting machines is set at the time of steady operation or when the twisting configuration of the steel cord is changed. An object of the present invention is to achieve reliable and easy tuning, stabilize twist of a cord, improve workability, and reduce cost.

[0007]

SUMMARY OF THE INVENTION A method for twisting a multi-layered twisted steel cord according to the present invention is characterized in that a tension fluctuation adjusting / detecting means provided between a first twisting machine and a collective guide is used for steady operation. The fluctuation of the tension of the core strand, which changes every moment, is detected, and the logical operation processing device in the electric control unit compares the detected fluctuation with the reference value and calculates the corrected value. It is characterized in that it is sent to the drive motor of a single stranded wire machine and its rotation speed is automatically controlled. Further, the multi-layer twisted steel cord twisting device of the present invention is a first twisting machine for twisting a core strand, a side strand feeding device, and a second stranding machine for twisting a core strand and a side strand. And a dancer roller device provided on a core strand between the first and second stranding machines, and connected to a moving roller of the dancer roller device via a transmission mechanism. A potentiometer, a logical operation processing device in an electric control unit electrically connected to the potentiometer, and a first stranded wire machine different from the drive motor of the second stranded wire machine electrically connected to the logic operation processing device And the drive motor of (1) is provided.

According to the twisting method of the present invention, the tension variation adjusting / detecting means provided between the first stranding machine and the second stranding machine is used to control the ever-changing tension variation of the core strand. By capturing the difference, it is possible to derive a difference in the linear speed between the first stranded wire machine and the second stranded wire machine. That is, when the wire speed of the first stranding machine is higher than the wire speed of the second stranding machine, the tension of the core strand is small, and when the wire speed of the first stranding machine is low, the core The strand tension increases. Normally, a dancer roller device is used as the tension fluctuation adjustment / detection means. Then, the detected tension fluctuation amount is replaced with a fluctuation value by a logical operation processing device, and the fluctuation value and a reference value are compared and calculated,
The correction value obtained from the calculation is sent to the drive motor of the first stranded wire machine, and the rotation speed of the drive motor of the first stranded wire machine is corrected, whereby the first stranded wire machine and the second stranded wire machine are modified. This synchronizes the linear velocity. By the way, the reference value is the position information of the moving roller immediately before the change value. That is, by detecting the increase or decrease in the tension from the positional relationship of the moving roller that changes every moment, the linear speed of the first stranded machine is corrected to the second speed by correcting the rotation speed of the drive motor of the first stranded machine in real time. This is to tune to the wire speed of the stranded wire machine.

Further, according to the twisting apparatus of the present invention, since a separate driving motor is provided for each twisting machine, it is possible to control the linear speed and the rotation speed of each twisting machine without restricting each other. In addition, a dancer roller device including a fixed roller and a moving roller is provided between the first twisting machine and the second twisting machine. After winding the core strand around the dancer roller device several times, the core strand and the side strands are assembled, introduced into a second stranding machine and twisted. If the wire speed of the first twisting machine becomes faster than the wire speed of the second twisting machine, the moving roller moves away from the fixed roller because the winding tension is weakened. If the wire speed of the first twisting machine becomes slower than the speed, the winding tension increases and the moving roller approaches the fixed roller. The movement of the moving roller is replaced by a rotational movement via a transmission mechanism such as a belt-gear mechanism or a chain-sprocket mechanism and sent to a potentiometer. The potentiometer converts this rotational variation into an electric signal and sends it to the logical operation processing device. Then, the rotation speed of the drive motor of the first twisting machine is appropriately corrected by the logical operation processing device.
As described above, the linear speed of the first stranding machine can be synchronized with the linear speed of the second stranding machine.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a commercially available torque motor or inverter motor is used as a driving motor for each twisting machine. Regardless of which motor is used, it is only necessary to electrically connect the wires so that logical operation processing can be performed.
By changing the frequency of the driving motor, the number of rotations can be freely changed. An output corresponding to this logical operation is performed by inverter control.

Further, a potentiometer is used as an instrument for detecting the moving direction and the moving amount of the moving roller of the dancer roller device. This potentiometer serves to detect the position of the moving roller by replacing the linear movement of the moving roller with the rotational movement, and to transmit the detected position information of the moving roller to the logical operation processing device by an electric signal.

In the above-mentioned logical operation processing device, set values of various types of steel codes are input in advance. By operating the switches, the setting of the wire speed of each twisting machine corresponding to the twisting configuration can be easily performed. During the operation of the twisting device, the linear speed of the first twisting machine is appropriately controlled in response to the movement of the moving roller based on the linear speed of the second twisting machine. As this logical operation processing device, a programmable logic circuit (PLC) is suitable. In addition, the logical operation processing device
Also provided is a determining means for determining the position of the moving roller,
When the position of the moving roller of the dancer roller device deviates from a preset allowable range, the position of the moving roller is set to be appropriately corrected.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 shows a stranded wire apparatus for producing a multi-layer stranded steel cord having a 2 + 7 structure. This twisting device includes a first stranding machine A for core strands, a second stranding machine B for cords, and a side strand feeding device C provided with a number of feeding reels.
And a dancer roller device D provided immediately after the first twisting machine A, and an electric control unit E (not shown).

The first twisting machine A includes a machine frame 1, a cradle 2 swingably suspended on the machine frame 1, flyers 3, 3 rotatably arranged on both sides of the cradle 2, and a core strand. Capstan 4, a drive motor 7 for driving the first twisting machine A via a plurality of belts 5 and a plurality of gears 6, guide rollers 8, 9 and cradle 2. The feed reel 10 and the like are the main components. In addition, two metal wires W are wound in parallel on the payout reel 10.

Further, the second stranded wire machine B for cords comprises
1 and a cradle 12 swingably suspended on a machine frame 11
And the second stranded wire machine B via flyers 13 and 13 rotatably arranged on both sides of the cradle 12, a take-up capstan 14 for picking up cords, a plurality of belts 15 and a plurality of gears 16. A driving motor 17 to be driven, guide rollers 18 and 19, a take-up reel 20 provided on the cradle 12, and the like are main components.

A dancer roller device D is disposed between the first twisting machine A and the second twisting machine B. The dancer roller device D includes a fixed roller 21 and a moving roller 22. Further, a potentiometer (not shown) is provided which converts the vertical movement of the moving roller 22 into a rotation angle and sends the rotation angle to the electric control unit E by an electric signal. The behavior of the moving roller 22 is replaced by an electric signal and transmitted to the electric control unit E. The logical operation control device in the electric control unit E calculates and corrects the set linear speed of the first twisting machine A, sends the speed command to the drive motor 7, and corrects the rotation speed of the drive motor 7. To follow the second twisting machine B.

An assembly guide 23 is disposed between the dancer roller device D and the second twisting machine B. Further, in the side wire feeding device C, seven feeding reels 24 around which the metal wires W are wound are rotatably provided.

In the present embodiment, the position of the fixed roller 21 of the dancer roller device is set to a point higher than the take-up capstan 14 and the collecting guide 23. However, the operation and effect of the present invention can be achieved irrespective of their positional relationship. Is what is done. For example, the position of the fixed roller 21 may be further lowered to the same height as the capstan 14 and the collecting guide 23, and the pass line of the core strand S may be linear.

Next, the wire speed correction mechanism of the first twisting machine A is shown in FIG.
This will be described in more detail based on When a difference between the linear speed of the first stranding machine A and the linear speed of the second stranding machine B occurs, the tension of the core strand S wound around the dancer roller device D fluctuates, and the moving roller 22 moves linearly. Then, the rotation is changed to a rotational movement via a transmission mechanism including the chain 27, the sprocket 28, and the gear 29, and an electric signal is transmitted from the potentiometer 30 to the electric control unit E. Then, the electric control unit E
A command is sent to the drive motor 7 of the first twisting machine A by the logical operation processing device therein, and the rotation speed of the drive motor 7 is corrected. Then, the above-described correction processing is performed for a predetermined time (for example, 20 m).
Performed every sec), the linear speed of the first stranded wire machine A can be synchronized with the linear speed of the second stranded wire machine B, and unmanned operation for a long time becomes possible.

Next, the production of a multi-layer twisted steel cord using the above-described twisting device will be described with reference to FIGS. The two metal strands W wound in parallel on the payout reel 10 in the cradle 2 of the first twisting machine A are:
Guided to the outside of the flyer 3 through the axis of the flyer 3,
The core strand S is formed by passing through the other axis while rotating around the cradle 2 via the guide rollers 8 and 9, and is taken up by the take-up capstan 4. The core strand S produced as described above is fed from the pay-out reel 24, merges with the seven metal strands W gathered by the gathering guide 23, and is guided to the second stranding machine B.

The core strand S and the seven metal wires W pass through one axis of the second twisting machine B and pass through the guide rollers 18 and 1.
9, is guided to the outer peripheral portion of the flyer 13, is rotated around the cradle 12, and is guided to the cradle 12 from the other shaft center via the other flyer 13 while rotating around the cradle 12. The group of wires led into the cradle 12 is twisted twice to complete a multi-layered steel cord having a 2 + 7 structure, and is taken up by the take-up capstan 14 and taken up by the take-up reel 20.

(Embodiment 2) FIG. 3 shows a stranded wire apparatus for producing a multi-layer stranded steel cord having a 3 + 8 structure. This twisting device is obtained by adding a feeding reel 25 to the structure of the first twisting machine A of the twisting device described in FIG. 1 of the first embodiment.
One metal wire W is wound around the pay-out reel 25. The metal wire W paid out from this payout reel is:
It is introduced from one shaft core of the first twisting machine A, rotates around the cradle 2 via the guide rollers 26, 26, and is introduced into the first twisting machine A through the other shaft core, The core strand S is formed by joining two metal strands W fed from the payout reel 10 and twisting a total of three metal strands W.

As shown in the second embodiment, depending on the number of metal strands constituting the core strand S, a new pay-out reel may be provided outside, or a pay-out reel may be additionally provided in the cradle. When it is desired to increase or decrease the number of metal wires of the sheath, the number of external feeding reels 24 may be appropriately increased or decreased. Thus, the 3 + 8 structure and the 3 + 9
Any multi-layer stranded steel cord such as structure can be manufactured.

[0024]

Since the present invention has the above-described structure, the number of working steps can be reduced, and the twisting cost can be drastically reduced.
In addition, since the linear speeds of the twisting machines can be easily synchronized with each other by the logical operation and the fluctuation of the linear speed during operation can be coped with, the production of a multilayer twisted steel cord with a stable twist becomes possible. Further, there is no slack or breakage of the steel cord due to the variation in the linear speed of the core strand and the cord, which is a problem of the conventional multi-layer stranded wire twisting device. Further, even if the twist configuration of the multi-layer twisted steel cord is different, it is possible to reliably and easily cope with the change of the wire speed, and the workability is greatly improved. Furthermore, since each twisting machine is operated by a single drive motor, each twisting machine can be used alone in some cases.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view of a twisting device for a multi-layer twisted steel cord according to a first embodiment.

FIG. 2 is a schematic explanatory view showing a linear velocity correcting mechanism of the twisting machine used in the present invention.

FIG. 3 is a schematic explanatory view of a twisting device for a multi-layer twisted steel cord according to a second embodiment.

[Explanation of symbols]

 1,11 Machine frame 2,12 Cradle 3,13 Flyer 4,14 Take-off capstan 5,15 Belt 6,16 Gear 7,17 Driving motor 8,9,18,19,26 Guide roller 10,24,25 Feeding reel 20 Take-up reel 21 Fixed roller 22 Moving roller 23 Assembly guide 27 Chain 28 Sprocket 29 Gear 30 Potentiometer A First stranded wire machine B Second stranded wire machine C Side wire feeding device D Dancer roller device E Electric control unit S Core strand

Claims (2)

[Claims] 1. A core strand drawn from a first stranding machine and a plurality of side strands fed from a side strand feeding device are assembled by an assembly guide, and then introduced into a second stranding machine and twisted. In the twisting method of the multi-layer twisted steel cord to be combined, the tension fluctuation adjustment / detection means provided between the first twisting machine and the collecting guide detects the tension fluctuation of the core strand that changes every time during steady operation. Then, the logical operation processing device in the electric control unit, by comparing and calculating the fluctuation value replaced from the detected fluctuation amount and the reference value, and sends the calculated correction value to the drive motor of the first twisting machine, A twisting method for a multi-layer twisted steel cord, characterized by automatically controlling the number of revolutions. 2. A multi-layer twisted steel cord comprising a first stranding machine for twisting a core strand, a side strand feeding device, and a second stranding machine for twisting a core strand and a side strand. In the wire device, a dancer roller device provided on a core strand between the first and second twisting machines, a potentiometer connected via a transfer mechanism to a moving roller of the dancer roller device, and electrically connected to the potentiometer A logical operation processing device in the electric control unit, and a drive motor of the first stranded wire machine different from the drive motor of the second stranded wire machine electrically connected to the logical operation processing device, Wire twisting equipment for multi-layer twisted steel cord.