JPH0581429B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial field of application This invention applies to an extrusion coated wire manufacturing line that manufactures an extrusion coated filament by extrusion coating an insulator around a core wire such as a copper wire. The present invention relates to an apparatus for controlling the outer diameter of an extruded coated filament that controls the outer diameter of the filament, that is, the thickness of the insulator.

(b) Prior Art When producing conductive wires such as covered electric wires having an insulator coated by extrusion around the filament, a so-called extrusion coated wire production line is generally used. A typical extrusion coated wire manufacturing line is shown in FIG. 4, as shown in the schematic diagram of its configuration, as shown in FIG.
This is a group of devices equipped with A drum on which a core wire, which is a conductor, is wound is set in the unwinding machine 1, and the core wire is unwound into the production line by the pulling force of the unwinding machine 5. The extruder 2 is a device that extrudes an insulating resin around this core wire to form an insulating coating layer. The wire on which the coating layer has been formed (covered wire) is guided to the cooling bath 4 and cooled, and the coating layer is hardened. In the steps up to this point, in order to keep the outer diameter of the extruded covered wire constant, the pulling machine 5 takes off the wire (core wire→extruded covered wire) at a predetermined speed. Thereafter, the winder 9 winds up the manufactured extrusion coated wire. by the way,
Although the winding drum is replaced every predetermined length of extruded coated wire, it is not possible to stop the winding of the wire even during the replacement work (if it is stopped, the outer diameter of that part will become uneven). Therefore, an accumulator 6 is provided between the take-up machine 5 and the winder 9 in order to hold the extruded coated wire taken off during the replacement work. This accumulator 6 is a device in which the extruded sheathed wire is detoured between the fixed sheave and the movable sheave, and by moving the movable sheave to the opposite side of the fixed sheave, the detour is lengthened, and the extruded sheathed wire is lengthened. can be retained. When the replacement of the winding drum is completed, the extruded coated wire is wound at high speed for a while to wind up the extruded coated wire that has been bypassed to the accumulator 6. The scale of such an extrusion coated wire production line is typical: Distance between unwinding machine and winding machine: 40 to 50 m Maximum amount of accumulated wire in the accumulator: about 200 m The pulling speed of the pulling machine 5 is 3 mm in outer diameter. (cross-sectional area 5.5 mm ² ) stranded conductor, 1.0
Extrusion coated with vinyl chloride insulation of mm, outer diameter
In the case of finishing to 5.0 mm, in such an extrusion coated wire production line, outer diameter control is performed to control the take-up speed of the take-off machine 5 and the extrusion speed of the extruder 2 in order to keep the outer diameter of the manufactured extrusion-covered wire constant. equipment is provided.
This outer diameter control device is a device that performs feedback control to inspect the outer diameter of the manufactured extruded coated wire and eliminate deviation from the target value. The device was equipped with an outer diameter measuring device to keep the outer diameter of the extruded coated wire constant (target value) at this position.

(c) Problems to be Solved by the Invention As described above, the conventional outer diameter control device performs various controls to keep the outer diameter of the extruded coated wire constant immediately after it is extruded. The insulating coating layer is still in a high temperature state, and is cooled and hardened by passing through the cooling bath 4. Through this cooling and hardening process, the coating layer shrinks to a certain extent and its outer diameter becomes smaller, but this shrinkage rate varies depending on the surrounding environment such as temperature and humidity, and the outer diameter is controlled to be constant during extrusion. However, the outer diameter when cooled - that is, the finished diameter -
There was a drawback that the value was not constant. For this reason, the extrusion diameter target value for the outer diameter control device was set by the staff by observing the environment at the time and based on their own experience, but this required skill and was difficult to maintain high accuracy. There was a problem in that if the environment changed during manufacturing, the target values had to be changed.

On the other hand, a method of measuring the finished diameter and controlling the operation of the take-off machine and extruder using this data is also considered, but the distance from the extruder to the point where it passes through the cooling tank is several tens of meters, so the measurement is performed at this point. Controlling the thickness of the coating layer formed at the extruder position based on the outer diameter obtained has the disadvantage that the inertia is too large and control becomes extremely difficult.

This invention measures the outside diameter (finished diameter) of the extruded coated wire that has passed through the cooling tank, and based on this, corrects the target value of the outside diameter measuring device immediately after the extruder that performs actual outside diameter control. An object of the present invention is to provide an apparatus for controlling the outer diameter of an extruded coated filament that solves the above problems.

(d) Means for solving the problem (1) The first invention of this application is a feeding machine that feeds out a core wire, an extruder that extrudes an insulating resin around the core wire to cover it, and a cooling device that cools the extruded insulating resin. An outer diameter control device installed in an extrusion coated filament manufacturing apparatus having a cooling tank, a take-off machine that takes off the cooled extrusion coated filament at a predetermined speed, and a winder that winds up the taken-off extrusion coated filament. A first outer diameter measuring device for measuring the outer diameter of the extruded coated filament immediately after the extruder, and a second outer diameter measuring device for measuring the outer diameter of the extruded coated filament between the cooling tank and the winder. an outer diameter measuring device; a first reference value storage means for storing a first reference value which is a target value of the outer diameter in the first outer diameter measuring device; and a second reference value storing means which is a target value of the outer diameter in the second outer diameter measuring device. a second reference value storage means for storing two reference values; and correcting the take-up speed of the take-off machine and/or the extrusion speed of the extruder so that the measured value of the first outer diameter measuring device becomes equal to the first reference value. The present invention is characterized by the following: speed correction means; and target value correction means for correcting the first reference value so that the measured value of the second outer diameter measuring device becomes equal to the second reference value.

(2) The second invention of this application is a feeding machine that feeds out a core wire, an extruder that extrudes and coats an insulating resin around the core wire, a cooling tank that cools the extruded insulating resin, and a cooled extruded coated wire. An outer diameter control device installed in an extrusion-coated filament manufacturing apparatus having a take-up machine that takes up the body at a predetermined speed and a winder that winds up the taken-off extrusion-coated filament, the extrusion-covered filament being removed immediately after the extrusion machine. a first outer diameter measuring device for measuring the outer diameter of the filament; a second outer diameter measuring device for measuring the outer diameter of the extruded coated filament between the cooling tank and the winding machine; a first reference value storage means for storing a first reference value which is a target value of the outer diameter in the measuring instrument; and a second reference value storing a second reference value which is a target value of the outer diameter in the second outer diameter measuring instrument. a storage means; a speed correction means for correcting the take-up speed of the take-off machine and/or the extrusion speed of the extruder so that the measured value of the first outer diameter measuring device becomes equal to the first reference value; The first standard is adjusted so that the measured value of the second outside diameter measuring device becomes equal to the second reference value with a correction period that is longer than the time required for the second outside diameter measuring device to pass between the first outside diameter measuring device and the second outside diameter measuring device. A target value correction means for correcting the value, and the following are provided.

(3) The third invention of this application is a feeding machine that feeds out a core wire, an extruder that extrudes insulating resin around the core wire to cover it, a cooling tank that cools the extruded insulating resin, and a cooled extruded coated wire. A take-up machine that takes up the body at a predetermined speed, a take-up machine that winds up the taken-up extruded coated filament, an accumulator that is provided between the take-up machine and the take-up machine, and has a detour for the filament of variable length; An outer diameter control device installed in an extrusion coated filament manufacturing apparatus comprising: a first outer diameter measuring device for measuring the outer diameter of the extrusion coated filament immediately after an extruder; an accumulator; and a winder. a second outer diameter measuring device that measures the outer diameter of the extruded coated filament between the machine and the first outer diameter measuring device; and a first reference value memory that stores a first reference value that is a target value of the outer diameter in the first outer diameter measuring device. means, second reference value storage means for storing a second reference value which is a target value of the outer diameter in the second outer diameter measuring instrument, a speed correction means for correcting the take-up speed of the take-off machine and/or the extrusion speed of the extruder; a detour measuring device for measuring the length of the striae detour of the accumulator; a passage time calculation means for calculating the time required for the extruded coated filament to pass between the first outer diameter measuring device and the second outer diameter measuring device from the path length; and a correction period equal to or longer than the passing time; A target value correcting means for correcting the first reference value so that the measured value of the second outer diameter measuring device becomes equal to the second reference value.

(e) Effect of the invention In the outer diameter control device for an extruded coated filament of the present invention, the speed of the drawing machine and/or the extruder is controlled based on the measurement value of the first outer diameter measuring device installed immediately after the extruder. I do. The outer diameter of the extruded coated filament is determined by the thickness of the insulator deposited in the extruder, so
By measuring this immediately after the extruder and performing feedback control, the extrusion diameter can be controlled with high precision. On the other hand, a second outer diameter measuring device installed after the cooling tank measures the outer diameter (finished diameter) of the extruded coated filament that has passed through the cooling tank, and this measured value becomes the second reference value. Correct the first reference value. As a result, the finished diameter can be maintained at the target value by controlling the extrusion diameter, and control errors such as control delays are eliminated.

Furthermore, in the second and third inventions of this application, after the first reference value is corrected, the extruded coated filament body that has been controlled based on the new first reference value is used in the second outer diameter measuring device. The next control will not be performed until it is sent to the position. This makes it possible to eliminate overshoot hunting without performing complicated control such as P control. In this case, in the outer diameter control device for an extruded coated filament of the third invention of this application, when an accumulator is provided between the first outer diameter measuring device and the second outer diameter measuring device, the accumulator is The actual length of the first outer diameter measuring device and the second outer diameter measuring device (the time required to pass through) is calculated from the condition of the muleta, and the correction cycle is set based on this. Eliminated control errors caused by mulrator operation.

(f) Embodiment FIG. 1 is a schematic diagram of an extrusion coated wire manufacturing line in which an outer diameter control device according to an embodiment of the present invention is used. In this figure, the parts having the same configuration as the extrusion coated wire production line explained in FIG. 4 are given the same numbers and the explanation will be omitted. In this extrusion coated wire production line, between the extruder 2 and the cooling tank 4 (extruder 2
Immediately after the first outer diameter measuring device 3 is installed.
A second outer diameter measuring device 8 is provided between the accumulator 6 and the winder 9. These outer diameter measuring instruments have a well-known configuration in which an extruded coated wire is passed between a laser light emitting part and a light receiving part, and the outer diameter of the coated wire is measured based on the time that the laser light is interrupted. It is. This type of outer diameter measuring instrument can perform a single measurement in a few μs, so in response to an outer diameter measurement command, it outputs the average value of hundreds of measurements, making it possible to cancel measurement errors. There is. Further, an accumulator sensor (detour measuring device) 7 is provided along the movable sheave movement path of the accumulator for measuring how much the extruded covered wire is detoured and stored by the accumulator 6. This accumulator sensor 7 is composed of 10 sensors 7-0 to 7-9 arranged in a row, and the length of the detour, that is, the amount of accumulated radiation, is determined by the sensor number that detected the movable sheave. It allows calculations to be performed. Furthermore, the take-up machine 5 is provided with a driving motor 5a and an encoder 5b for outputting the rotation amount. By counting the encoded pulses of the encoder 5b, the collection amount and collection speed of the collection machine 5 can be calculated.

These outer diameter measuring devices 3 and 8, accumulator sensor 7, and encoder 5b are connected to a controller 10 via an interface group 12. The controller 10 is composed of a microcomputer, and the interface group 12 has the function of converting data groups input in various formats into digital signals that can be handled by the controller 10, and the input/output control of the controller 10 and the above-mentioned measuring instruments. It has the function to do. Further, a setting device 11 is connected to this interface group 12.
This setting device 11 is also provided with an outer diameter setting key for inputting a target value for the finished diameter (product outer diameter) of the extruded coated wire, and a start switch and a stop switch for starting/stopping the operation of this extruded coated wire manufacturing line. . Furthermore, interface group 1
The motor 5a of the take-off machine 5 and the extruder 2 are connected to 2, so that a take-up speed control signal and an extrusion speed control signal can be output. In addition, in the following example, the operation of controlling only the motor 5a of the take-up machine is explained, but it is also possible to control the extrusion speed of the extruder.

FIG. 2 shows a group of registers set in the controller 10.

R1 is the extrusion target value, R0 is the finishing target value, P
is the withdrawal speed. The controller 10 controls the take-up speed P so that the measured value of the first outer diameter measuring device 3 becomes R1.
and corrects R1 so that the measured value of the second outer diameter measuring device 8 becomes R0. R0 is set by a staff member using the setting device 11. Note that the extrusion target value R1 corresponds to the first reference value of the present invention, and the finishing target value R1 corresponds to the first reference value of the present invention.
0 corresponds to the second reference value of this invention.

C1, C2 and A1, A2 are first counters,
They are a second counter, an extrusion diameter accumulation area, and a finished diameter accumulation area. The first counter C1 and the extrusion diameter accumulation area A1 are registers used when correcting the take-up speed P based on the first outer diameter measuring device by a timer interrupt. The extrusion target value R is determined based on the measured value of the second outer diameter measuring device by interruption.
This is a register used when modifying 1.

S is an accumulator sensor register. This register is a register that stores the number of the accumulator sensor 7 (7-0 to 7-9) that detected the movable sheave.

F is a passing flag F. This flag is a flag for storing that the tip of the extruded coated wire manufactured after the correction when the extrusion target value R1 was corrected has passed the second outer diameter measuring device 8.

The operation of this outer diameter control device (controller 10) will be explained with reference to the flowchart in FIG.
A in the figure is the main routine, B in the figure is the timer interrupt routine, and C in the figure is the encoder interrupt routine.

In the main routine shown in FIG. 5A, first, when a finish target value is inputted from the setting device 11 by an attendant (n1), the take-up speed P and the extrusion target value R1 are calculated and stored in each register (n2). Next, when the staff member turns on the start switch (n3), the take-up machine 5 starts taking over and the extruder 2 starts extruding (n4). At the same time, interrupt operation for outer diameter control (see B and C in the same figure) is permitted (n5). In this state, the extrusion coated wire manufacturing operation continues, and during this time, a timer interrupt is applied by the clock function built in the controller, and the encoder 5b
An encoder interrupt is generated by an encoder pulse input from the encoder. This state will continue until the stop switch is turned on by the staff member,
When the stop switch is turned on (n6), the interrupt operation is first prohibited (n7), and the extrusion of the extruder 2 is stopped (n8). After confirming that the last part of the core wire extruded and coated by the extruder 2 has been taken up by the take-off machine 5, take-up is stopped (n9) and the operation is completed.

B in the figure shows the timer interrupt operation. This interrupt operation may be performed every several tens of ms to 100 ms. When this operation starts, the extrusion diameter is first read by the first outer diameter measuring device (n11). This extrusion diameter is integrated into the extrusion diameter integration area A1 (n12), and the first counter C1 is added (n13). If the value of this first counter does not reach a predetermined value (about 10), the process returns (n14). When the count value of the first counter C1 reaches the predetermined value, counting is completed (n14), and the average extrusion diameter is calculated by calculating A1/C1 (n15). The deviation between this average extrusion diameter and the extrusion target value R1 is calculated (n16). The take-up speed P is corrected to eliminate this deviation (n17). This modification may be performed using, for example, PI control or fuzzy inference. Thereafter, the extrusion diameter accumulation area A1 and the first counter C1 are cleared (n18) and the process returns.

C in the figure is an encoder interrupt. If the pulse period of encoder 5b is set to about 30cm/pulse,
At a take-up speed of 200 m/min, an interrupt will occur approximately every 100 ms. In this way, by arranging the interruption to occur every certain length of take-up by the take-up machine 5, changes in take-up speed can be canceled. At the beginning of this operation, it is first determined whether the pass flag F is set (n21). When the passing flag F is set, it indicates that the portion pushed out during the previous correction of the extrusion target value has already passed the position of the second outer diameter measuring device 8.

When the flag is reset, n21→n22
After incrementing the second counter C2, the value (S) of the accumulator sensor 7 is read (n23).
A passing count number Cp is calculated based on S. The passing count number is a number corresponding to the distance from the first outer diameter measuring device 3 to the second outer diameter measuring device 8, and is the number of encoder pulses for this length.

The movable sheave of the accumulator 6 is connected to the sensor 7-
The distance from the first outer diameter measuring device 3 to the second outer diameter measuring device 8, including the length of the detour when it is in the 0 position, is a fixed length Lf, which is formed when the movable sheave moves by one sensor. Assuming that the increase in length of the detour is variable length Lv, the sensor number is ν, and the take-up length per encoder pulse is Lp, it can be calculated as Cp=(Lf+Lv×ν)÷Lp.

In addition, for reliable and safe determination, Lf may be replaced with the distance from the extruder 2 to the second outer diameter measuring device 8 instead of the first outer diameter measuring device 3 to the second outer diameter measuring device 8.

At n25, the value of the second counter C2 is compared with this Cp, and if C2 is greater than or equal to Cp, the extruded coated wire manufactured with the previously revised extrusion target value R1 has passed through the second outer diameter measuring device. Therefore, move on to the outer diameter measurement operation. Therefore, the second counter C2 is cleared (n26), the passing flag F is set, and the process returns (n27). If C2 is less than Cp, return as is (n25).

When the pass flag F is set, the operations following n28 are executed. First, at n28, the finished diameter is read by the second outside diameter measuring device 8, and this finished diameter is integrated into the finished diameter integration area A2 (n29). Next, the second counter C2 is incremented (n30), and it is determined whether the counting is completed (n31). Returns if the count is not completed.

If the count has been completed, the operations following n32 are executed to correct the extrusion target value R1. first,
The average value of the finished diameter is calculated (n32), and the deviation from the finished target value R0 is calculated (n33). The extrusion target value is corrected to eliminate this deviation (n34).
That is, if the average finished shape is larger than the target finished value, the extrusion target value is revised smaller according to the larger ratio, and if the average finished diameter is smaller than the target value, the extrusion target value is similarly revised larger. Thereafter, the second counter C2 and finished diameter accumulation area A2 are cleared (n35), the passing flag F is reset (n36), and the process returns.

In this encoder interrupt operation, after the previous extrusion target value R1 correction, the next control is stopped until the result is known, but if P1 control or fuzzy inference control is used for this extrusion target value correction, continuous Control becomes possible.

In this embodiment, everything is controlled by a controller consisting of a microcomputer, but a hard logic circuit using a counter or a gate circuit, or the output of the outer diameter measuring device is obtained as an analog voltage value, and an operational amplifier, A similar circuit can be constructed using an analog circuit using an integrating circuit or the like, and it goes without saying that these also belong to the technical scope of the present invention.

(g) Effects of the invention As described above, according to the outer diameter control device for extruded coated filaments of the present invention, the actual finished diameter is measured after the cooling tank, and based on this measurement, the By modifying one standard value, the extrusion diameter can be constantly controlled based on the finished diameter, and the finished diameter can be kept constant even if the external environment changes. Further, since the actual control of the take-up speed and the like is performed based on the measured value of the first outer diameter measuring device, the outer diameter can be easily and accurately controlled with less control inertia.

Furthermore, according to the second and third inventions of this application, the correction of the first reference value is performed at intervals, thereby eliminating the need for complex control such as PI control. In this case, in the third invention, even if the accumulator operates when replacing the winding drum, the correction interval by the second outer diameter measuring device is changed based on the amount of operation, so that the correction interval by the second outer diameter measuring device is changed. Control errors will no longer occur.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a schematic configuration of an extrusion coated wire manufacturing line using an outer diameter control device according to an embodiment of the present invention, and Fig. 2 shows a group of registers set in the controller of the outer diameter control device. Figures, Figures 3A-C
is a flowchart showing the operation of the controller. Moreover, FIG. 4 is a schematic diagram of a general extrusion coated wire production line. 1... Feeding machine, 2... Extruder, 4... Cooling tank,
5... Collection machine, 6... Accumulator, 9...
Winding machine, 3... First outer diameter measuring device, 8... Second outer diameter measuring device, 7 (7-0 to 7-9)... Accumulator sensor.

Claims (1)

[Claims] 1. A feeding machine that feeds out a core wire, an extruder that extrudes insulating resin around the core wire to cover it, a cooling tank that cools the extruded insulating resin, and a cooled extruded coated filament at a predetermined speed. An outer diameter control device installed in an extrusion coated filament manufacturing apparatus having a take-up machine for taking off and a winding machine for winding up the extrusion coated filament that has been taken off, the outer diameter control device being installed in an extrusion coated filament manufacturing apparatus immediately after the extrusion machine. a first outer diameter measuring device for measuring the outer diameter; a second outer diameter measuring device for measuring the outer diameter of the extruded coated filament between the cooling tank and the winding machine; a first reference value storage means for storing a first reference value that is a target value of the diameter; a second reference value storage means for storing a second reference value that is a target value for the outer diameter of the second outer diameter measuring instrument; speed correction means for correcting the take-up speed of the take-off machine and/or the extrusion speed of the extruder so that the measured value of the first outer diameter measuring device becomes equal to the first reference value; and the measured value of the second outer diameter measuring device; A device for controlling the outer diameter of an extruded coated filament, comprising: target value correcting means for correcting the first reference value so that the first reference value is equal to the second reference value. 2. A feeding machine that feeds out the core wire, an extruder that extrudes insulating resin around the core wire to cover it, a cooling tank that cools the extruded insulating resin, a pulling machine that takes the cooled extruded coated filament at a predetermined speed, and a pulling machine An outer diameter control device installed in an extrusion coated filament manufacturing apparatus having a winder for winding the extrusion coated filament, the outer diameter control device including a winder for measuring the outer diameter of the extrusion coated filament immediately after the extruder. a second outer diameter measuring device that measures the outer diameter of the extruded coated filament between the cooling tank and the winder; and a target value of the outer diameter of the first outer diameter measuring device. a first reference value storage means for storing a first reference value; a second reference value storage means for storing a second reference value which is a target value of the outer diameter in the second outer diameter measuring instrument; and a first outer diameter measuring instrument. speed correction means for correcting the take-up speed of the take-off machine and/or the extrusion speed of the extruder so that the measured value of is equal to the first reference value; Target value correction means for correcting the first reference value so that the measured value of the second outer diameter measuring device becomes equal to the second reference value at a correction cycle longer than the time required to pass between the outer diameter measuring devices; A device for controlling the outer diameter of an extruded coated filament, characterized in that it is provided with: 3. A feeding machine that feeds out the core wire, an extruder that extrudes insulating resin around the core wire to cover it, a cooling tank that cools the extruded insulating resin, a pulling machine that takes the cooled extruded coated filament at a predetermined speed, and a pulling machine An apparatus for manufacturing an extruded coated filament comprising: a winder for winding the extrusion coated filament, and an accumulator provided between the take-up machine and the winder and having a variable-length filament detour. The outer diameter control device is provided with a first outer diameter measuring device that measures the outer diameter of the extruded coated filament immediately after the extruder, and a first outer diameter measuring device that measures the outer diameter of the extruded coated filament between the accumulator and the winder. a second outer diameter measuring instrument for measuring an outer diameter; a first reference value storage means for storing a first reference value which is a target value of the outer diameter in the first outer diameter measuring instrument; a second reference value storage means for storing a second reference value which is a target value of the diameter; and a drawing speed of the drawing machine and/or extrusion so that the measured value of the first outer diameter measuring device becomes equal to the first reference value. a speed correction means for correcting the extrusion speed of the machine; a detour measuring device for measuring the length of the striae detour of the accumulator; and a detour measuring device for measuring the length of the striae detour of the accumulator; a passing time calculation means for calculating the time required to pass between the first outer diameter measuring instrument and the second outer diameter measuring instrument; A device for controlling the outer diameter of an extruded coated filament, comprising: target value correcting means for correcting the first reference value so that it becomes equal to the second reference value.