JPS6352977B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for manufacturing stranded wires for, for example, electric cables, and more particularly to an apparatus for manufacturing stranded wires by combining a wire drawing machine and a stranding machine in tandem on the same line. It is something.

In order to reduce the number of processes for the purpose of lowering the manufacturing cost of electric cables, a stranding manufacturing device has been proposed in which a multi-strand wire drawing machine and a buncher-type stranding machine are combined in tandem on the same line (for example, Tokuko Showa 55-
(See No. 41352). With this device, if the tension of each wire rod is not balanced between the wire drawing machine and the wire twisting machine, the center wire will protrude or become thinner during twisting, and if the tension of the outer layer wire is not constant, the twisting The appearance becomes irregular.

In order to solve this problem, the applicant first proposed that the take-up speed x of the wire stranding machine and the circumferential speed y of the final capstan of the wire drawing machine are stretched in the relationship y=ax+A (a is a proportionality constant, A is a bias). He proposed a method for controlling line machines (Japanese Patent Application No. 57-218444). In the above equation, a rotation speed detector is used as a signal of x, but fluctuations in the output voltage cannot be avoided due to the characteristics of the rotation speed detector. For example, the rotation speed of a bunchier type wire twisting machine is
At 1000r.pm (drawing speed of 42m/min when the wire cross section is ^2mm2 ), the voltage of the rotation speed detector is approximately 30V.
The fluctuation is ±0.45V, which is relatively small. However, the rotation speed of the bunchier type wire twisting machine is
At 200r.pm (pulling speed 8.3m/min), the voltage of the rotation speed detector is approximately 6V, and the fluctuation is approximately ±0.45V, which corresponds to approximately ±15r.pm when converted to rotation speed, indicating that the wire is too tensioned. It has the disadvantage of being too loose. As can be seen from this example, when the wire twisting machine is running at high speed, the voltage of the rotation speed detector relative to the rotation speed is ±1.5%, but when the wire twisting machine is running at low speed, the voltage increases to ±15%. Even though the actual rotation speed of the stranding machine is constant, if the rotation speed detector fluctuates as shown above,
The peripheral speed of a wire drawing machine fluctuates under the influence of voltage fluctuations from a rotation speed detector. In other words, when the voltage of the rotation speed detector increases, the circumferential speed of the wire drawing machine increases and the tension decreases, and conversely, when the voltage of the rotation speed detector decreases, the wire drawing machine slows down and the tension decreases. becomes large, causing wire breakage inside the stranding machine. The appropriate circumferential speed of a wire drawing machine is affected by the capstan diameter of the wire drawing machine, the number of turns of the wire, the wire diameter, the wire speed, etc., but a multi-wire drawing machine cannot make such a large capstan. The capstan is relatively small compared to the wire diameter, and therefore there is usually considerable slippage at low speeds.

In order to prevent such disconnection at low speeds,
It is possible to increase the value of , but if you do this, the bias will become too large at normal linear speeds, resulting in large slips on the capstan.
The surface of the wire rod is easily damaged due to wear of the capstan,
In addition, if the wire becomes too loose, the wire crosses on the capstan and is likely to break.

An object of the present invention is to provide a stranded wire manufacturing apparatus that can always operate at a stable and constant speed from start to stop and obtain high quality stranded wire.

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows an apparatus of the present invention, in which a multi-strand wire drawing machine 12 and a bunchier-type wire twisting machine 14 are the same. In the illustrated embodiment, the wire twisting machine 14 is shown to have seven wires 1, and after leaving the wire drawing machine 12, the seven wires 1 are combined on the wire drawing machine 12 by the tension control rolls 38. A stranded wire is produced by twisting six outer layer wires around one centerline by a twisting machine 14 while maintaining constant tension.

The wire drawing machine 12 has six wire drawing dies 1 for each wire rod.
6 and six capstans 18 are alternately arranged in a straight line. In addition, in Fig. 1, the reference numeral 2
0 and 22 are an entrance guide roll and an exit guide roll, respectively. The seven wire rods 1 enter the wire drawing machine 12 from the entrance guide rolls 20, are drawn into wire rods 1' having a predetermined outer diameter, and pass through the exit guide rolls 22.

The wire twisting machine 14 enters the cage 24 through the twister 26 and the guide roll 28, passes through the cage 24 in an arcuate manner, passes through the guide roll 28', passes through the capstan 30, the guide roll 32, and the traverser 34 to the winding drum 36. It is wound up and twisted twice in one revolution of the cage 24.

According to the principle of the present invention, as shown in FIG. 3, if the take-up speed of the wire twisting machine 14 is x and the circumferential speed of the final capstan 18A of the wire drawing machine 12 is y, then during normal operation, y=ax+A (a is proportionality constant, A is bias)
However, in the low speed region of x, A is made larger than during normal operation, and y = ax + C.
Control is performed using the relationship (C=A+B>A). In this way, if you increase the bias value in the low speed region of x,
Even if the speed ratio of y and x increases and there is a large fluctuation in the voltage of the rotation speed detector, which will be described later, the wire 1 will not be disconnected. In the illustrated example, the low speed region of x is 1/5 or less of the circumferential speed during steady operation, that is, 8.3 mm/min compared to the steady take-up speed of 42 mm/min.
This area may be larger than 1/3 or less.

FIG. 2 shows one specific example of the device of the invention,
In this specific example, the take-up speed x of the wire twisting machine 14 is taken out from the tension control roll 38 to control the drive motor 40 of the final capstan 18A of the wire drawing machine 12. The take-up speed detection means includes a rotation speed detector 44 via a belt transmission mechanism 42 from 38, and the rotation speed detector 44 detects a take-up speed signal Sx corresponding to the take-up speed x. This take-up speed signal Sx
The slope is varied within a range of 15% or less using a variable resistor VR1 to obtain a variable slope signal Sax corresponding to the product of a proportionality constant a (corresponding to the slope) and the take-up speed x. The reason for changing the proportionality constant a within a range of 15% is as follows. The peripheral speed of the wire drawing machine 12, that is, the peripheral speed of the capstan 18, varies depending on the dimensions of the conductor to be drawn, but the peripheral speed of the capstan is set higher than the actual speed of the wire to prevent slipping between the wire and the capstan. ing. This speed difference corresponds to the slip rate, which is the change in the slope of the proportionality constant (in the range of 15%). The change in this gradient differs between the high-speed state and the low-speed state of the wire, and the higher the speed, the smaller the gradient becomes. Incidentally, if it exceeds the range of 15%, the wire rod will be drawn out too much and control will not be performed smoothly, so it is preferable to change the slope within 15%. Further, this take-up speed signal Sx is supplied to a comparison circuit 52, which generates a low-speed region signal Ss when this take-up speed signal is smaller than a predetermined value Sd. When the low speed region signal Ss is generated, the arithmetic circuit 44 connects the variable resistor to the variable slope signal Sax.
The bias signal SA corresponding to the bias value A generated from VR2 is added to the auxiliary bias signal SB generated from the variable resistor VR3 through the changeover switch 51 which is closed by the low speed region signal Ss.
A control signal Sys corresponding to +A+B is generated. Also, when Sx is larger than Sd, the low speed region signal Ss
Since this is not occurring, the changeover switch 51 is open and generates the control signal Syo which is the sum of the variable slope signal Sax and the bias signal SA. These control signals
Sys or Syo is supplied to the drive circuit 48 of the drive motor 40 via the start/stop switch 46. Therefore, the drive motor 40 moves the final capstan 18A of the wire drawing machine 12 to y=ax+C(A+B) or y=
It is driven by a drive circuit 48 to set the peripheral speed to a controlled peripheral speed of ax+A. In FIG. 2, reference numeral 49 denotes a gear transmission mechanism that drives the final capstan 18A from the drive motor 40, and 50.
is a rotation speed detector of the drive motor 40, and its signal is fed back to the drive circuit 48 and compared with the control signal Sy, so that the drive motor 40 is driven at a predetermined rotation speed.

In addition, although the take-up speed x of the wire stranding machine is taken out from the tension control roll 38, it may be taken out from the capstan 30, or it may be taken out from the wire rod 1' or another roll that engages with the stranded wire. good.

According to the present invention, as described above, even if there is a fluctuation in the output of the rotation speed detector in the low speed range of the wire twisting machine, wire breakage does not occur, and therefore the wire is twisted with stable tension from start to stop. There are practical benefits that can be achieved.

[Brief explanation of drawings]

Fig. 1 is a schematic system diagram of the method of the present invention, Fig. 2 is a circuit diagram of an example of a control circuit used in the device of the present invention, and Fig. 3 is a line showing the relationship between x and y according to the principle of the present invention. It is a diagram. 10...1,1'...Wire rod, 12...Wire drawing machine, 1
4...Twisting machine, 18A...Final capstan.

Claims (1)

[Scope of Claims] 1. An apparatus for continuously twisting a plurality of wires after drawing, which comprises a multi-strand wire drawing machine and a bunchier-type wire twisting machine combined on the same line, wherein the wire twisting machine a take-up speed detection means for detecting a take-up speed signal Sx of the take-up speed signal Sx; and a take-up speed signal from the take-up speed detection means.
an arithmetic circuit that is supplied with a variable slope signal Sax obtained by giving a slope to Sx, a bias signal SA, and an auxiliary bias signal SB and generates a control signal for driving a final capstan of the wire drawing machine; a comparison circuit that compares Sx with a predetermined value Sd and generates a low-speed region signal Ss when said Sx is smaller than Sd; and a comparison circuit that generates a low-speed region signal Ss when said Sx is smaller than Sd; SB
and a changeover switch for supplying the wire to the arithmetic circuit, and the arithmetic circuit controls the take-up speed x of the wire twisting machine and the circumferential speed y of the final capstan of the wire drawing machine when the low speed region signal Ss is not generated. is controlled according to the relationship y=ax+A (a is a proportionality constant, A is bias), but when the low speed region signal Ss is generated, it is controlled according to the relationship y=ax+C (C=A+B>A). A stranded wire manufacturing device characterized by calculation. 2 The low speed region is 0 to 1/ of the maximum speed.
The stranded wire manufacturing apparatus according to claim 1, wherein the stranded wire manufacturing apparatus has a speed range of 3 or less.