JP2825592B2 - Control equipment for metal wire coating equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a metal wire coating facility for manufacturing a coated wire by coating a metal wire with an insulating composition made of a foamed metal resin, and more particularly to the present invention. The present invention relates to a control device for adjusting the finish outer diameter and capacitance of the covered wire with high accuracy.

(Prior art)

The coated wire manufactured by the metal wire coating equipment as described above is used for communication means of telephone equipment and general electric equipment, and has a capacitance (μF /
m) and finish dimensions (μm) of the outer diameter are required with high accuracy.

On the other hand, from the viewpoint of productivity, a high take-off speed of the coated wire is required, and the
It is required that the take-up speed be at least 00 m and that the finished outer diameter and the capacitance of the coated wire be within acceptable tolerances immediately after the start-up.

FIG. 1 shows an electric wire coating facility 1 which is an example of the above-described metal wire covering facility. In the electric wire covering equipment 1,
Supply line 4 _b contained in Koirusutokka 12 is supplied to the annealer 11 as being reduced in diameter core wire 4 _a by wire drawing machine 10 annealing. On the other hand, a polyethylene resin, which is an example of a synthetic resin, and an organic foaming agent are supplied to an extruder 3, and a screw (not shown) provided inside a cylinder (not shown) of the extruder 3 causes a crosshead 3 at the tip of the cylinder to be moved. It is press-fitted into _a. The polyethylene resin and the organic blowing agent, H ₁ of the heater (FIG. 2 disposed on the crosshead 3 _a in the cross-head 3 _a
Is heated to a predetermined temperature which is equal to or higher than the decomposition temperature of the organic foaming agent.

Further, the core wire 4 _a held at an appropriate temperature is led to the crosshead 3 _a of the extruder 3, wherein the polyethylene resin is coated the coated electric wire 4 along the inner shape of the cross head 3 _a. Then, the coated electric wire 4 is picked up by a subsequent picking-up machine 9 in a picking-up method (arrow F), immersed in water of a water-cooling tank 6, cooled and solidified, and then its capacitance is measured by a capacitance meter 7. Is done. Next, the outer diameter of the covered electric wire 4 is measured by an outer diameter meter 8.

Therefore, in the electric wire covering equipment 1, the screw rotation speed and the like of the extruder 3 have been conventionally controlled in proportion to the take-up speed v of the take-up machine 9 in order to obtain desired capacitance and outer diameter.

The capacitance of the covered electric wire 4 has been adjusted based on the actual measurement value by moving the water-cooling tank 6 in the take-off direction using the movable cooling tank 5. That is, the adjustment by the time to cool and solidify after coating of the polyethylene resin was adjusted by changing the distance between the crosshead 3 _a water-cooled tank 6, to control the foaming degree of the polyethylene resin Is performed. Further, the outer diameter of the covered electric wire 4 has been adjusted by manually measuring and changing the screw rotation speed of the extruder 3 and the set temperature of the extruder 3 based on the actually measured values.

[Problems to be solved by the invention]

In the electric wire covering equipment 1 as described above, in order to control the capacitance C of the covered electric wire 4, the movement of the water cooling tank 6 in the take-off direction is caused to return the detected capacitance C of the covered electric wire 4. It is often controlled by feedback control. However, if the proportional gain of these control systems becomes extremely large, for example,
May be largely moved by the movable cooling tank 5.
In some cases, the movable cooling tank 5 may exceed its control range and become uncontrollable.

Therefore, an example of a metal wire coating facility which solves such inconvenience is disclosed in, for example, Japanese Patent Publication No. 53-43194. According to this, like the metal wire coating equipment 1, the metal wire coating equipment feeds back the distance between the extruder 3 and the water cooling tank 6 based on the detected capacitance C of the coated electric wire 4. I am doing it. Extruder 3
For example, as a result of changing the temperature range of the cylinder,
If the water-cooling tank 6 reaches a position extremely far from or too close to the extruder 3 within the control range, the water-cooling tank 6 returns to an appropriate position within the control range, that is, a substantially middle position after a certain period of time. In order to make it possible, the cylinder temperature of the extruder 3 is corrected.

However, when the temperature of the extruder 3 is changed, not only the capacitance C of the insulated wire 4 but also the outer diameter D thereof changes. Therefore, the moving distance of the water cooling tank 6 and the take-up speed of the covered electric wire 4 could not be controlled independently.

Further, regarding the control of the temperature of the extruder 3 as described above,
Since a relatively large response delay occurs, the capacitance C and the outer diameter D of the covered electric wire 4 cannot be controlled with high accuracy.

Therefore, an object of the present invention is to predict the future temperature of the insulator composition at the time of extrusion, and to control the heating of the temperature of the insulator composition, so that the moving distance of the cooler and the metal wire are controlled. It is an object of the present invention to provide a control apparatus for a metal wire coating facility capable of controlling a take-up speed and the like independently and adjusting a capacitance and an outer diameter of a coated wire with high accuracy.

[Means for solving the problem]

In order to achieve the above object, the main means adopted by the present invention is to supply an extruder with an insulator composition made of a foamed synthetic resin, and to apply the synthetic composition onto a metal wire continuously supplied to the extruder. Extruded and coated at a temperature higher than the foaming temperature of the resin, and cooled and solidified by a cooler that can move away from the extruder in the supply direction of the metal wire, and control the outer diameter and the capacitance of the insulator composition to predetermined values. A temperature sensor for detecting the temperature of the insulator composition extruded on the metal wire, and a parameter relating to the detected physical property value of the insulator composition and the response characteristics of the facility. A ₁ , A ₂ , A
₀₁ , A ₀₂ , and parameter calculation means for calculating A ₀₃ , each deviation between the control target value and the detected value of the outer diameter and the capacitance of the insulator composition, and a parameter from the parameter calculation means. Non-interference control means for independently controlling the moving distance of the cooler and the take-up speed of the metal wire, and a resin temperature prediction parameter for evaluating the gain of the non-interference control means is within a predetermined range. Does not change the temperature setting for the insulator composition, and when the resin temperature prediction parameter is outside the predetermined range, the temperature detected by the temperature sensor and the temperature of the extruded insulator composition A resin temperature control means for controlling the heating of the insulating composition according to a predicted temperature determined by a temperature prediction function for predicting a change; and is there

A ₀₁ = (D ° ² -d ²⁾ (1-P °) A ₀₂ = 2D ° (1-P _{[deg.) V (t) A 03 =} (D ° ² -d ²⁾ v (t) where, D゜ is the outer diameter detection value of the insulator composition coated on the metal wire, d is the outer diameter of the metal wire, P ゜ is the foaming ratio of the insulator composition, and E _S (P) is the insulator composition. The dielectric constant when the foaming rate of the object is P 発 泡, and v (t) is the take-up speed of the metal wire at a certain time t.

However, the non-interference control means that the take-up speed of the covered wire is controlled so that the outer diameter of the covered wire and the capacitance do not interfere with each other.

[Action]

According to the present invention, first, the parameter calculation means calculates the physical property values of the insulator composition coated on the metal wire and the parameters relating to the response characteristics of the facility. Since this parameter is calculated based on the detected measurement data, an appropriate value according to the operating conditions at that time is calculated.

Then, the non-interference control means moves the cooler based on the deviation of each control target value and the detected value of the capacitance and the outer diameter of the insulator composition and the parameter based on the parameter and the moving distance of the metal wire. The take-off speed is controlled independently.

When the gain of the non-interference control means is out of a predetermined range by the resin temperature control means, heating control is performed according to the predicted temperature so as to appropriately maintain the control state of the equipment. Here, the temperature prediction function for obtaining the predicted temperature is a function determined by measuring in advance the time change when the insulator composition is heated by a heater or the like, and the time of the non-linear temperature is determined. Indicates a change. Further, when the gain of the non-interference control means is within a predetermined range, there is no possibility that control of the equipment becomes impossible, so that the temperature setting is not changed.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a configuration diagram showing an electric wire coating equipment according to one embodiment of the present invention, FIG. 2 is a block diagram showing a control system by a control device of the electric wire coating equipment, and FIG. FIG. 4 is a flowchart showing a processing procedure of the control device.

In the following description, the same reference numerals will be used for the elements common to the wire covering equipment 1 of FIG. 1 described in the related art, and the description thereof will be omitted. Further, the following embodiments are merely specific examples of the present invention, and do not limit the technical scope of the present invention.

In the control device 2 of the electric wire covering equipment 1 according to the present embodiment, as shown in FIG.
D _O , the take-up speed v _ref , the foaming rate P _O of the polyethylene resin are given to the metering device 13, and the metering device 13 has a manipulated _variable according to the outer diameter D _O , the take-up speed v _ref. Speed N,
The distance l between the crosshead 3 _a water-cooled tank 6 by driving the movable cooling bath 5, a take-up speed v, motor M ₁ for screw drive of the corresponding extruder 3, the motor M of the movable cooling bath 5 for driving ₂ ,
Respectively output to the motor M ₃ of the take-up device 9 for driving. Then, the control device 2 takes in the capacitance C ゜ and the outer diameter D ゜, the screw rotation speed N ゜, and the take-up speed v ゜ of the insulated wire 4 which are the measured amounts, and is a correction amount of the set value of the operation amount. , Δ
N ,, Delta] v, screw rotation speed N of the original set value by calculating respective .DELTA.l, take-up speed v, given the distance l, is output to the motor M _1, M _2, M ₃ as a new set value. Also, heater
The H _1, the correction amount Δθ in accordance with the temperature of the crosshead 3 _a of the extruder 3 is added to the original set temperature theta. The crosshead
3 temperature of _a was buried in the crosshead 3 _a, for example, is detected by the thermistor 15.

 Hereinafter, a specific example of the apparatus according to the present embodiment will be described.

In addition, when the rising state after the operation is started and the steady state is reached, the outer diameter D and the capacitance C of the insulated wire 4 are simultaneously set to the respective target values.
It is necessary to accurately and quickly approach D _O and C _O. As is well known, the outer diameter D and the capacitance C change simultaneously mainly due to the movement of the water cooling tank 6 by the movable cooling tank 5, so that they each interfere with each other. That is, assuming that the distance from the outlet of the crosshead 3a of the extruder 3 to the water cooling tank 6 at a certain time t is l (t) and the take-up speed of the covered electric wire 4 in a steady state is v, the foaming time τ (t ) Is represented by the following equation (1).

τ (t) = l (t) / v (1) Here, since the foaming rate P of the polyethylene resin monotonically increases with the foaming time τ (t), P = P (τ (t)) Can be shown.

At this time, the capacitance C is expressed by the following equation (2) according to the known Wagner formula.

Where C = capacitance D = outer diameter of coated wire d = outer diameter of core wire P = foaming rate E _S (P) = dielectric constant of polyethylene resin when foaming rate P F = farad On the other hand, (2) The dielectric constant E _S (P) in the equation is represented by the following equation (3).

Here, E _S (0) = dielectric constant _{a = 2E S (0) +1} b = -2 (E S (0) -1) c = 2E S (0) +1 e = E S (0) -1 It is.

The relative dielectric constant E _S (0) is a unique value, and is about 2.3 here.

Incidentally, the foaming rate P, as described above, becomes a function of the blowing time tau (t), at the same time also, the temperature of the polyethylene resin when the extruded in the cross head 3 _a on the core wire 4 _a theta ( It is also a function of t). Therefore, the foaming ratio P can be strictly expressed as in equation (4).

P = P (τ (t), θ (t)) (4) However, the temperature θ (t) of the polyethylene resin is:
Is controlled by the heater H ₁ arranged around the cross head 3 _a, the response characteristic is considerably worse than the response speed of the response speed and puller 9 of the movable cooling bath 5.

Therefore, the present inventors have determined that the cylinder of the extruder 3 (not shown),
Was investigated each response characteristics using crosshead 3 _a, a heater disposed around the die (not shown). According to it, considering the dead time and temporary delay, the crosshead
3 Response of heating by the heater H ₁ surrounding _a was the most satisfactory. The response of the heater H ₁ of the crosshead 3 _a at this time is shown in Figure 3. This response characteristic, the heater H ₁ due to the temperature of the crosshead 3 _a theta (t) (corresponding to the temperature prediction function) is the Laplace transform domain, i.e. in the s-domain, expressed as the following equation (5) .

Here, α ₁ , α ₂ , and α ₃ in the equation (5) are constants determined by experiments and representing heater characteristics. That is, α ₁ is the dead time of the control system, α ₂ is its primary delay, α ₃
There respectively temperature differences up to steady-state converged from the control starting point of the temperature of the crosshead 3 _a. The constant alpha ₁ according to the experiments according to the response characteristic of the heater H ₁ of the crosshead 3 _a
20 to 44 seconds, which was several minutes in terms of total first-order lag. Note that the constants α ₁ , α ₂ , α ₃ are obtained in advance by an experiment,
Stored at 14.

Next, the outer diameter D (t) of the insulated wire 4 and the capacitance C
The control of (t) will be described below.

As in (1), the transfer time covered electric wire 4 is transferred from the cross head 3 _a outlet of the extruder 3 to the water cooling tank 6, the equal to the foaming time tau (t), the distance l (t) It is a linear function.

Therefore, there is now a deviation of the capacitance C (t) of the polyethylene resin from its target value C _O by ΔC (t) = C (t) -C _O , and for this compensation, the moving cooling tank 5 is the distance Δl
Suppose that it has moved by (t). Thus, the travel time 1τ (t) is Only change.

That is, the foaming time of the polyethylene resin changes by Δτ (t) time.

Accordingly, the foaming ratio is ΔP (t) and the capacitance is ΔC
(T), assuming that the coating outer diameter fluctuates by ΔD (t),
The following equation (6) holds.

In this case, the mass of the extruder 3 exit from stored, i.e., since the total differential value of the formula (D ° ² -d ²⁾ (1-P °) v (t) is zero, the following (7 ) Equation is derived.

(D ° ² -d ²⁾ (1-P °) Δv (t) + 2D DEG (1-P [deg.) V (t) ΔD (t ) - (D ° ^{2 -d 2) v (t)} , ΔP ( t) = 0 (7) Here, P ゜ indicates the foaming rate of the polyethylene resin calculated from the measured values C ゜ and D ゜ of the capacitance and the outer diameter of the insulated wire 4.

On the other hand, by fully differentiating the Wagner formula (Equation (2)), the following equation (8) is derived as follows: ΔC = A ₁ ΔP + A ₂ ΔD (8)

Here, the parameters A ₁ and A ₂ are represented as follows.

Here, the permittivity E _S (P) in the equation is given by the equation (3).

Parameters A ₀₁ , A ₀₂ , A ₀₃ indicating each term of equation (7)
Is expressed as follows.

A ₀₁ = (D ° ² -d ²⁾ (1-P °) A ₀₂ = 2D ° (1-P _{[deg.) V (t) A 03 =} (D ° ² -d ²⁾ v (t) or less, A ₀₁ , A ₀₂ , and A ₀₃ are non-interference control parameters for independently controlling the capacitance C and the outer diameter D of the insulated wire 4.

A ₀₁ Δv + A ₀₂ ΔD−A ₀₃ ΔP = 0 (9) Then, the following expression (10) is derived from the expressions (9) and (8).

When the equation (6) is applied to the equation (10), the following equation (11) including the moving distance Δl (t) of the movable cooling tank 5 is derived.

Here, the coefficient of the first row and the first column in the coefficient matrix in the equation (11) is a self factor of the variation ΔC of the capacitance C, and the coefficient of the second row and the second column is the outer diameter D. Change amount Δ
D is a self-factor. The coefficients in the first row and second column and the second row and first column are the factors of the change amounts ΔC and ΔD that have an influence on the other party.

Further, a denominator of each coefficient in the first row in the matrix of coefficients, put the parameter X the _{(∂P / ∂τ) · A 1} .
The parameter X is used as a parameter for predicting the resin temperature. Further, the parameter X has two threshold values.
E ₁ and E ₂ (where E ₁ <E ₂ ) are set and stored in the memory 14. These threshold values E ₁ and E ₂ are set so that the movable cooling tank 5 does not deviate from its control range, that is, the movable cooling tank 5 is kept in an appropriate control range except for an end within the control range. Is required in advance.

For each coefficient in the coefficient matrix of the equation (11), table values categorized by resin type, temperature level, and outer diameter dimension level are stored in the memory 14 in advance as a reference table.

The control operation of the control device 2 of the electric wire covering device 1 configured as described above will be described below according to the processing means shown in the flowchart of FIG.

The processing means includes a data logging routine (step
S2 to S3), parameter table update routine (step
S51 to S53), resin temperature control routine (steps S11 to S2)
1) and a non-interference control routine for the capacitance C and the outer diameter D (steps S31 to S41). Each of these routines is executed as parallel processing at time intervals Δt ₀ , Δt ₂ , ΔT ₁ , Δt ₁ respectively defined.

Therefore, when the control device 2 is started, data relating to the operating conditions of the wire coating equipment 1 is initialized, and reference tables for parameters for non-interference control and parameters for resin temperature prediction are set (S1). Then, the control device 2 includes a capacitance meter 7 and an outer diameter meter 8 of the wire coating equipment 1.
Measurement data C ゜, N ゜, v from various sensors such as
{゜, D} are input every time Δt ₀ (S2). The measurement data taken into the control device 2 is referred to when executing other routines (S11, S31, S51). Further, an offset amount for each set value of the measurement data is calculated (step S3). Then, the parameters A ₁ , _AZ , A ₀₁ , A ₀₂ , A ₀₃ at that time are calculated based on the measurement data, and the correction amounts ΔA ₁ , ΔA ₂ , ΔA ₀₁ for the corresponding parameters in the reference table of the parameters are calculated. , ΔA ₀₂ and ΔA ₀₃ are calculated (S52). These correction amounts are added to the values of the parameters in the current table storing the parameters at that time, and the current table is updated (S53). That is, the functions of steps 51 to S53 are realized by the parameter calculation means.

Then, in the resin temperature control routine, first, the measurement data input from the wire coating equipment 1 is referred to (S1).
1). Therefore, the moving distance Δl (t) of the moving cooling tank 5 moved for compensating the deviation ΔC of the measured capacitance C ゜ from the target value C ₀ of the capacitance is obtained from the equation (3). From the change amount ΔP of the foaming rate at that time, the temporal change rate ∂P / ∂τ of the foaming rate P is calculated using equation (6) (S1
2), further calculates the parameter X for resin temperature prediction from the parameter A ₁ Tokyo in the current table and the temporal change rate ∂P / ∂τ (S13).

Then, the parameter X is evaluated. First, whether the parameter X is between threshold E ₁ and the higher threshold value E ₂ of the low is determined, it is if it is true (E ₁ ≦ | X |
≦ E _2), the movable cooling bath 5 is determined to be in the proper position within the control range, the heater H ₁ of the crosshead 3 _a of the extruder 3 is not carried out the predetermined change of the control amount, a polyethylene resin Is not changed (S21).

Meanwhile, the when the parameter X is smaller than the threshold value E ₁ of the low to (S14), during execution of the next of the routine, i.e. the time after [Delta] T _1, the predicted temperature of the polyethylene resin after extrusion θ (t + ΔT ₁₎ It is calculated based on equation (5). At the same time, the parameter X is within a predetermined range (E ₁ ≦ | X | ≦ E ₂ )
Is satisfied, the temperature θ ′ (t) of the polyethylene resin is obtained, and the temperature difference between the predicted temperature θ (t + ΔT ₁ ) and the temperature θ ′ (t) is calculated as a correction amount Δθ _{1 of the} polyethylene resin temperature. (S15). Then, after leaving the control command signal to the heater H ₁ of the crosshead 3 _a to only warm the correction amount [Delta] [theta] ₁ of the temperature the polyethylene resin (S16 and S 17).

This is because, when the value of the parameter X is extremely small, the proportional gain of the control system becomes apparently extremely large as seen in the first row of the coefficient matrix of the equation (11). It becomes necessary to significantly move the moving amount Δl (t) of the tank 5. Therefore, in some cases, the movable cooling tank 5 may exceed its control range and fall out of control. This is to prevent this.

On the other hand, when said parameter X has exceeded the threshold value E ₂ of the high (S18) also, the process similar to the step S14~S16 are executed. That is, the predicted temperature θ (t + ΔT ₁ ) of the polyethylene resin at the next execution of the routine is calculated based on the equation (5), and the predicted resin temperature θ ′ (t) at which the parameter X falls within the predetermined range is calculated. obtains a temperature difference between the temperature as the correction amount [Delta] [theta] ₂ of the temperature of the polyethylene resin (S19),
The current temperature and outputs a control command signal to the heater H ₁ of the crosshead 3 _a as the temperature is lowered ₂ minutes the correction amount [Delta] [theta] (S20,
S17).

In this case, the value of the parameter X is prevented from becoming extremely large, thereby preventing an apparent decrease in control sensitivity. That is, the steps S11-S
Means for realizing the 21 functions is the resin temperature control means.

Further, the non-interference control routine is executed in parallel with the resin temperature control routine. After all, the deviations ΔC and ΔD of the capacitance and the outer diameter from the target values C _O and D _O are calculated from the measurement data input from the electric wire covering device 1 (S
31～S33), followed by the parameter A ₁ for non-interference control the current stored in the current table, A _2, A _01,
From A ₀₂ and A ₀₃ , the value of the coefficient matrix in the equation is calculated based on equation (11) (S34). Then, based on the deviations ΔC, ΔD relating to the capacitance and the outer diameter and the value of the coefficient matrix, the correction amount Δl of the set value l relating to the distance between the extruder 3 and the water cooling tank 6, ie, moving cooling The movement amount of the tank 5 and the correction amount Δv of the set value v related to the take-up speed of the covered electric wire 4 are calculated (S35). These correction amounts .DELTA.l, Delta] v is fed back to the original settings, set values that have been modified respectively are supplied independently each motor M _2, M ₃ (S36~S4
1). It should be noted that each of the correction amounts Δ
Limiters (S36, S39) are provided for l and Δv, which restrict Δl ≦ l _max and Δv ≦ v _max . In particular, in S39, the determination is made in consideration of the absolute speed v + Δv.

According to this non-interference control routine, for example,
If the outer diameter D substantially matches the target value D _O and the capacitance C has a deviation ΔC from the target value C _O , the distance set value 1 is corrected by the correction amount Δl (t). Not only that, the change of the takeoff speed v by the correction amount Δv (t) can be performed.

On the other hand, when the capacitance C substantially coincides with the target value C _O and the outer diameter D is shifted by ΔD, not only the correction amount Δv (t) of the take-up speed v but also the correction of the distance 1 is corrected. Quantity Δ
It is understood that the change for l (t) should be made simultaneously. That is, means for realizing the functions of steps S31 to S41 is non-interference control means.

If such control is performed by general feedback control, hunting may occur in some cases. However, according to the present embodiment, the movable cooling tank 5 is set to an appropriate predetermined range within its control range. so as to be always held in a position, in other words, to prevent extreme reduction or excessive foaming of the foaming degree, the core wire 4 to predict the future temperature of the polyethylene resin is extruded onto _a temperature of the polyethylene resin, i.e., it controls the temperature of the crosshead 3 _a (S11~S21), the above-mentioned problems do not occur.

〔The invention's effect〕

As described above, the present invention supplies an insulator composition made of a foamed synthetic resin to an extruder, and extrudes and coats a metal wire continuously supplied to the extruder at a foaming temperature of the synthetic resin or higher. In the control device of the metal wire coating equipment for cooling and solidifying with a cooler which is movable in the feeding direction of the metal wire so as to be separated from the extruder, and controls the outer diameter and the capacitance of the insulator composition to predetermined values. A temperature sensor for detecting the temperature of the insulating composition extruded onto the metal wire, and parameters A ₁ , A ₂ , A ₀₁ , A relating to the physical property values of the detected insulating composition and the response characteristics of the equipment. ₀₂ , _A03 parameter calculation means for calculating _A03 , based on the deviation from each control target value and the detected value of the outer diameter and capacitance of the insulator composition and the parameters from the parameter calculation means. The moving distance of the cooler and the Non-interference control means for independently controlling the take-up speed, and when the resin temperature prediction parameter for evaluating the gain of the non-interference control means is within a predetermined range, the temperature setting for the insulator composition is changed. In the case where the resin temperature prediction parameter is outside the predetermined range, the temperature is determined by the temperature detected from the temperature sensor and a temperature prediction function for predicting a temperature change of the extruded insulator composition. A resin temperature control means for controlling the heating of the insulator composition in accordance with the predicted temperature, the control device of the metal wire coating equipment characterized by the fact that the gain of the non-interference control means is large. When there is a risk that the cooler may become uncontrollable, the heating of the insulator composition is controlled to arrange the cooler at an appropriate position, and the capacitance of the insulator composition coated on the metal wire And outer diameter The adjustment can be performed with high accuracy without interfering with each other.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electric wire covering equipment according to one embodiment of the present invention, FIG. 2 is a block diagram showing a control system of a control device of the electric wire covering equipment, and FIG. 3 is a heater for heating a crosshead. FIG. 4 is a flowchart showing a processing procedure of the control device. [Reference Numerals] 1 ...... wire coating equipment, 2 ...... controller 3 ...... extruder, 3 _a ...... crosshead 4 ...... covered wire, 5 ...... movable cooling bath 6 ...... water cooling tank, 7 ...... Capacitance meter 8: Outside diameter meter, 13: Metering device 15: Thermistor

Continuation of the front page (56) References JP-A-58-157007 (JP, A) JP-A-58-175218 (JP, A) JP-A-63-10410 (JP, A) (58) Fields investigated (Int) .Cl. ⁶ , DB name) H01B 13/14 B29C 47/02 B29C 47/92

Claims (1)

(57) [Claims] An insulating composition comprising a foamed synthetic resin is supplied to an extruder, and is extruded and coated on a metal wire continuously supplied to the extruder at a foaming temperature of the synthetic resin or higher. In the control device of the metal wire coating equipment for cooling and solidifying with a cooler that is freely movable in the wire feeding direction and away from the extruder, and controlling the outer diameter and the capacitance of the insulator composition to predetermined values, A temperature sensor for detecting the temperature of the insulator composition extruded on the wire, and parameters A ₁ , A ₂ , A ₀₁ , A ₀₂ , and a physical property value of the detected insulator composition and a response characteristic of the equipment. a parameter calculating means for calculating a a _03, the cooler based on the control target value of the outer diameter and the electrostatic capacity and the respective deviation between the detected value and the parameter from the parameter calculation means of the insulator composition Travel distance and take-up speed of the metal wire Non-interference control means for independently controlling the, if the resin temperature prediction parameter for evaluating the gain of the non-interference control means is within a predetermined range, without changing the temperature setting for the insulator composition, When the resin temperature prediction parameter is out of the predetermined range, the temperature detected by the temperature sensor and a temperature prediction function that predicts a temperature change of the extruded insulator composition and a predicted temperature determined by a temperature prediction function. And a resin temperature control means for controlling the heating of the insulator composition in response to the control signal. A ₀₁ = (D ° ² -d ²⁾ (1-P °) A ₀₂ = 2D ° (1-P _{[deg.) V (t) A 03 =} (D ° ² -d ²⁾ v (t) where, D ⁰ is the outer diameter detection value of the insulator composition coated on the metal wire, d is the outer diameter of the metal wire, P ⁰ is the foaming rate of the insulator composition, and E _S (P) is the insulator composition. The dielectric constant at the foaming rate P ⁰ of the object, v (t) is the take-up speed of the metal wire at a certain time t.