JPH07105177B2 - Method and apparatus for calculating linear velocity of running wire rod in extruder - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a method and a device for calculating the linear velocity of a wire rod running in an extruder, and in particular, anyone can easily take out the coating resin to be taken out from the extruder for linear velocity calculation. The present invention relates to a method for calculating a linear velocity of a traveling wire rod in an extruder, which can reduce an error in a take-out operation and can prevent an error in manufacturing a cable due to an incorrect linear velocity calculation, and an apparatus thereof.

[Prior art]

Generally, an electric wire cable has a structure in which a synthetic resin insulator is coated on the outside of a conductor. In order to improve electrical stability, flexibility, and space factor (accommodating multiple cores in a small outer diameter), most of these wire cables except the single-core cable are formed by twisting the wire core group in various ways. It is a twisted wire. In the case of this stranded cable, a plurality of electric cables are twisted together and the outermost sheath made of synthetic resin (for example, polyvinyl chloride resin) is coated on the outside. When covering this sheath, a resin extruder 100 as shown in FIG. 8 is generally used. That is, the resin extruder 1
00 has a crosshead 170, and a die 110 is attached to the tip of the crosshead 170. The die 110 is provided with a flange 112 at the rear end of the die body 111. Further, the die body 111 is formed in a tubular shape, and the inner surface of the die body 111 is provided with a shape-retaining portion 115 at a predetermined distance from the tip end opening 114 to form a taper portion 113. The die body 11 is attached to the tapered portion 113 in the die body 111.
A cylindrical nipple 140 is fitted with a predetermined gap from the inner surface of 1. The die body 111 and the nipple 140 are arranged concentrically. A die holder 120 is engaged with the flange 112 at the rear end of the die body 111.
An adjustment bolt 130 is attached to the die holder 120, and the adjustment bolt 130 is for adjusting the deflection of the die body 111. Further, the nipple 140 fitted to the inner surface of the die body 111 is fixed to the nipple holder 150, and the nipple holder 150 has a sleeve 160.
It is fixed to. The inner surface of this die body 111 and the nipple 1
The extrusion section 200 formed between the adapter section 180 and
The coating resin 190 is sequentially fed from below. The pressure feeding of the coating resin 190 is performed by rotating a screw. Therefore, the wire rod 3 traveling in the approximate center of the nipple 140
The shape-retaining portion 115 of the die 110 is coated with the coating resin 190 sequentially pressure-fed from the adapter portion 180 on the surface of 00. The wire 300 coated with the coating resin 190 is the opening 1 of the die 110.
After passing through 14, the coating resin 190 is cooled by contact with air, and the coating resin 190 is cured and shaped. In this way, the thickness of the coating resin 190 coated on the surface of the wire rod 300, that is, the coating amount varies depending on the type, material, wire diameter, and the like of the wire rod 300. The coating amount of the coating resin 190 on the surface of the wire rod 300 is such that the amount of the coating resin 190 extruded from the crosshead 170 of the resin extruder 100 is constant, so that the wire rod passing through the crosshead 170 of the resin extruder 100. Determined by a running speed of 300. Further, the extrusion amount of the coating resin 190 extruded from the crosshead 170 of the resin extruder 100 per unit time varies depending on the type of the coating resin 190. That is, the crosshead 1 of the resin extruder 100
If the extrusion amount of the coating resin 190 extruded from the 70 is constant, the wire rod passing through the crosshead 170 of the resin extruder 100.
When the traveling speed of 300 is increased, the coating resin 190 coated on the surface of the wire rod 300 becomes thinner. The thickness of the coating resin 190 with which the surface of the wire rod 300 is coated varies depending on the type of the wire rod 300, the material, the wire diameter, and the like. Therefore, it is necessary to set the traveling speed of the wire rod 300 passing through the crosshead 170 of the resin extruder 100 so that the thickness of the coating resin 190 is determined by the type, material, wire diameter, etc. of the wire rod 300 to be covered. Therefore, conventionally, the traveling speed of the wire has been obtained by the method shown in FIGS. 5 and 6. That is, a clock 400, a scale 450, and a calculator (desktop calculator) 500 are prepared in advance. In this state, first, the crosshead 170 of the extruder 100 is overhauled to check the kneading state of the extruded material, and the coating material is discharged. The operator visually checks the kneading state of the coating material extruded from the crosshead 170, and when it becomes satisfactory, the rotation of the screw feeding the coating resin 190 is increased to the rated rotation. After that, the rotation of the screw rises to the rated value and waits until the discharge amount of the coating resin 190 stabilizes in the rated operation. When the discharge amount of the coating resin 190 in the rated operation of the screw becomes stable, the worker removes the coating resin 190 that was being discharged at the same time when the worker operates the watch 400, and removes the coating resin 190 extruded from the crosshead 170 of the extruder 100. Receive in hand. After a lapse of a predetermined time, the operator stops the clock 400, removes the coating resin 190 received by hand from the crosshead 170, places it on the balance 450, and measures it. From the measured value and the measurement time of the clock 400, the operator calculates the extrusion amount per unit time by the calculator 500. Further, from the amount of extrusion per unit time and the thickness of the coating resin 190 that coats the surface of the wire rod 300, the operator determines the traveling speed of the wire rod 300 passing through the crosshead 170 of the resin extruder 100 by the calculator 500. calculate. The calculated traveling speed of the wire rod 300 is set in the take-up machine, the take-up line speed is raised to the calculated value, and the coating resin 190 is coated with the crosshead 170. During this time, the rotation of the screw is maintained at the rated value.

[Problems to be Solved by the Invention]

As described above, conventionally, when the sheath of the multi-core electric wire cable is coated, the extruder 100 is operated to coat the surface of the wire rod 300 with the coating resin 19.
When starting extrusion to cover 0, wire 3
In order to know the set speed of the traveling speed of 00, the rotation of the screw that is feeding the coating resin 190 is increased to the extruder rated rotation, and the watch 400 is used to coat the resin per unit time at the rated rotation. The weight of the resin 190 is measured by the scale 450, and using the calculator 500, It is calculated by the formula. That is, in the conventional method of calculating the linear velocity of the wire rod running in the extruder, the coating resin 190 for linear velocity calculation is used.
Take out a predetermined amount of, after the rotation of the screw rises to the rated value and the discharge amount of the coating resin 190 is stabilized in the rated operation,
After the operator operates the clock 400 and measures for a predetermined time, the operator stops the clock 400 again and receives the coating resin 190 extruded from the crosshead 170 of the extruder 100 in his hand. In this way, the operator has to look at the clock 400 and operate it, which makes it difficult to perform the work.
There is an error in the operation of and the operation of taking out the coating resin 190 extruded from the crosshead 170 of the extruder 100, and this error causes a problem in the calculation of the extrusion amount per unit time. Further, in the conventional method of calculating the linear velocity of the wire rod running in the extruder, since the operator individually calculates each value using the calculator 500, it is easy to make a calculation error, Extruder 100 crosshead 170
There is a problem in that the loss of the coating resin 190 extruded from is large. The present invention enables anyone to easily take out the coating resin taken out from the extruder for calculating the linear velocity,
Moreover, it is intended to reduce the error in the take-out operation of the coating resin and prevent the manufacturing error of the cable due to the calculation error of the linear velocity.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, in the linear velocity calculation method of the traveling wire rod in the extruder of the present invention, when the molten resin is quantitatively extruded and coated, the coating material is extruded from the extruder before traveling the wire rod. Is discharged for a predetermined time, the weight of the discharged coating material is measured, the extrusion amount per unit time from the extruder is calculated from the weight and the coating material discharge time, and the calculated value and the resin coating wire material. The linear velocity of the wire rod running in the extruder is calculated based on the coating amount of the coating material that covers the surface of the wire rod, which has been obtained in advance based on the material, wire type, wire diameter, and the like. Further, in order to achieve the above object, in the linear velocity calculation device of the traveling wire rod in the extruder of the present invention, a weighing device for measuring the weight of the coating material extruded from the crosshead of the extruder, and the weighing start at the time of the weighing. A time measuring device that sometimes starts and stops at the end of weighing, and a coating amount per unit length of the wire that is coated on the surface of the wire determined by the wire type and wire diameter of the wire running in the extruder. And a setter for setting the amount of extrusion of the molten resin per unit time extruded from the crosshead of the extruder from the measured value measured by the measuring instrument and the measurement time measured by the time measuring instrument. A wire rod running in the crosshead of the extruder based on the resin extrusion amount per unit time and the coating amount per unit length of the wire rod set by the setting device. It is obtained constituted by a calculator for calculating the. Further, the above arithmetic unit is provided with a display unit for displaying the linear velocity calculated by the arithmetic unit. Further, it is preferable to connect an integrator to the above-mentioned measuring device and sequentially integrate the integrated measurement values measured by the measuring device unless reset.

[Action]

By using the linear velocity calculation method for the traveling wire rod in the extruder configured as described above, anyone can easily work because the coating resin for linear velocity calculation is taken out without looking at the clock. Since the linear velocity is automatically calculated only by measuring the coated resin, the calculation error can be reduced. Further, the linear velocity calculation device of the running wire rod in the extruder, a measuring device for measuring the weight of the coating material taken out from the extrusion nozzle of the extruder, and the coating amount per unit length for coating the wire material traveling in the extruder. A setting device to be set, a time measuring device that operates at the same time as turning on the start switch and continuously measures time until the stop switch is turned on, a measured value measured by the measuring device, and a measuring time measured by the time measuring device. From the extruder to calculate the extruded coating amount per unit time, and also to calculate the linear velocity of the wire rod from the extruded coating amount per unit time and the coating amount per unit length of the wire rod set in the setting device. Since it is composed of a display unit and a display unit that displays the linear velocity calculated by the calculation unit, anyone can create it easily and with a small error. It is possible to manufacture errors by miscalculation can be prevented, and it is possible to set a short time at a linear velocity.

【Example】

Examples of the present invention will be described below. FIG. 1 shows an embodiment of a linear velocity calculation method for a traveling wire rod in an extruder and an apparatus therefor according to the present invention. In the figure, a linear velocity calculation device 1 is attached to an extruder 100. That is, the crosshead 1 of the extruder 100
A touch bar switch 2 is provided near 70, and the touch bar switch 2 is connected to the linear velocity calculation device main body 3. The touch bar switch 2 has a structure as shown in FIG. That is, the touch bar switch 2 includes the touch sensor unit 202 supported by the fixed unit 201.
And a lead wire 203 is connected to the fixed portion 201. Further, the fixed portion 201 is fixed to one end of an arm 204 that is configured to be rotatable.
A handle 205 is provided at the other end of the. The touch sensor unit 202 is on / off-operated when touched by a human hand, and there is, for example, one using electrostatic capacitance. The touch bar switch 2 can be housed so that a worker cannot easily touch it by rotating the arm 204 as shown by an arrow A in FIG. Further, a measuring device 4 is provided above the linear velocity calculation device body 3. The weighing device 4 is an electric type weighing device, which weighs by placing an object to be measured on the upper pan, and the weighing result is provided on the front panel of the linear velocity calculation device main body 3. The measured value display 5 is digitally displayed. The measured value display 5 is one in which photoelectric elements are arranged in a matrix for digital display or liquid crystal display. A time setter 6 is provided on the front panel of the linear velocity calculation device body 3. The time setter 6 is an off-timer used when the time is measured without using the touch bar switch 2, and an operator can set an arbitrary time in minutes. Further, on the front panel of the linear velocity calculation device main body 3, an extrusion speed indicator 7, an integrated amount display switch 8, a metered integrated value reset switch 9, a coating amount setting device 10, a linear velocity display 11, a printer.
12, a print reset switch 13, and a power switch 14 are provided. The extrusion rate display 7 displays the extrusion rate (g / min) of the coating resin 190 extruded from the crosshead 170 of the extruder 100 per unit time. The extrusion speed indicator 7 is a device for arranging photoelectric elements in a matrix for digital display or a liquid crystal display. Further, the integrated amount display switch 8 is a switch for digitally displaying on the measured value display section 5 a value obtained by integrating all the weights of the objects to be measured placed and weighed on the upper pan of the weighing machine 4. . Further, the integrated measurement value reset switch 9 is used for the measuring instrument 4 which is digitally displayed on the measured value display section 5.
This is a switch for resetting the integrated value of the total weight of the measured object weighed in. The coating amount setting device 10 sets the coating amount according to the thickness of the coating resin 190 which is determined by the type, material, wire diameter, etc. of the wire material 300 to be coated. That is, the coating amount setting device 10 sets the coating amount per unit length of the coating resin 190 with which the wire rod 300 running in the extruder 100 is coated. Also, the linear velocity indicator 11
Is the extruder 100 displayed on the extrusion speed indicator 7.
Of the coating resin 190 extruded from the cross head 170 per unit time (g / min), and the coating resin 190 determined by the type, material, wire diameter, etc. of the wire rod 300 to be coated set in the coating amount setting device 10. The linear velocity of the wire rod running in the extruder, which is calculated and calculated based on the coating amount by the thickness, is digitally displayed. This linear velocity display 11 is one for arranging photoelectric elements in a matrix for digital display or liquid crystal display. Further, the printer 12 prints a value obtained by adding up all the weights of the objects to be measured placed and weighed on the upper plate portion of the weighing device 4. In addition, the print reset switch 13
Is to reset. Also, the power switch 14 is
An on / off power supply for operating the linear velocity calculation device body 3. The linear velocity calculation device 1 has a circuit configuration as shown in FIG. That is, the time bar 50 is connected to the touch bar switch 2. This time measuring instrument 50
When the touch bar switch 2 is brought into contact with the hand, the time measurement is started and started, and when the hand is brought into contact with the touch bar switch 2 again, the time measurement is turned off. This time measuring device 50 is a changeover switch
It is connected to the first arithmetic circuit 52 via 51, and the time measured by the time measuring device 50 is used as the first arithmetic circuit 52.
Is output to. A set time measuring device 53 is connected to the time setting device 6. The set time measuring device 53 sets the measurement time by the time setting device 6 in minutes, and immediately starts subtracting and counting the time, and completes the measurement of the set time when it becomes 0 (zero). . This set time measuring device 53 is provided with a first arithmetic circuit 52 via a changeover switch 51.
And outputs the time set by the set time measuring device 53 to the first arithmetic circuit 52. The changeover switch 51 is restrained by the time setting device 6. That is, when the time setting device 6 is operated, the changeover switch 51 switches the connection state between the time measuring device 50 and the first arithmetic circuit 52 to the connection state between the set time measuring device 53 and the first arithmetic circuit 52. It is like this. Further, the measured value from the measuring device 4 is input to the first arithmetic circuit 52. An integrator 54 is connected to the weighing device 4, and the printer 12 is connected to the integrator 54. The integrator 54 sequentially accumulates the weight put on the weighing device 4 unless the integrated weighing value reset switch 9 is turned on. That is, the integrator 54 is
Check the kneading status of the extruded material, raise the screw rotation of the extruder to the rated speed and stabilize, and discharge the extruded material until the resin discharge amount stabilizes. Overhaul discharge resin and resin discharged to calculate the linear velocity. The amount is accumulated. In this way, the integrator 54 integrates the overhaul discharged resin and the discharged resin amount for the linear velocity calculation in order to know the material yield amount in a short time. In the first arithmetic circuit 52, the time measuring device 50
Alternatively, the coating resin extruded from the crosshead 170 of the extruder 100 based on the time input from the set time measuring device 53 and the measured value in the measuring device 4 after the time measurement or time setting.
The extrusion rate (g / min) per unit time of 190 is calculated.
The calculation result is displayed on the extrusion speed display 7. A second arithmetic circuit 55 is connected to the first arithmetic circuit 52. The second arithmetic circuit 55 is configured to input the coating amount based on the thickness of the coating resin 190 which is set by the coating amount setting device 10 and is determined by the type, material, wire diameter, etc. of the coating wire material 300. ing. In the second arithmetic circuit 55, the extruder 10 input from the first arithmetic circuit 52 is input.
Extrusion rate per unit time of 0 crosshead 170 (g /
Minute) and the coating amount (g / m) of the coating resin 190 per unit length for coating the wire rod 300 input from the coating amount setting device 10, and the linear velocity of the wire rod 300 is calculated. The calculation result is displayed on the linear velocity display 11. Based on the linear speed displayed on the linear speed indicator 11, the worker sets a speed setting device for the wire drawing speed at which the wire is run. The first arithmetic circuit 52 and the second arithmetic circuit 55 constitute an arithmetic unit. The starting flow of extrusion coating of this wire 300 is shown in FIG. Therefore, according to the present embodiment, unlike the conventional case, when removing the coating resin at the time of overhaul without looking at the timepiece, the operator just touches the touch bar to measure the time,
This measurement time is sent to the data processing unit of the computing unit, and when the material is placed on the weighing machine immediately, the data processing unit receives the measurement time and the weight, and the calculated cable coating calculated weight is set in advance. The calculated linear velocity can be displayed immediately. Further, according to the present embodiment, the total weight can be displayed each time the material is placed on the weighing machine, and the total weight can be displayed on the printer. In addition, the extrusion amount (g / min) of the crosshead 170 of the extruder 100 per unit time, and the coating amount of the coating resin 190 per unit length for coating the wire rod 300 input from the coating amount setting device 10 (g / m), the linear velocity value of the wire rod 300 calculated by the second arithmetic circuit 55 can be directly input to the wire rod take-up speed speed setter to automatically set the linear speed. By doing so, it is possible to prevent the operator from making a setting error.

【The invention's effect】

Since the present invention is configured as described above, it has the effects described below. When quantitatively extruding and coating the molten resin on the running wire, the coating is discharged from the extruder for a predetermined time before running the wire, and the weight of the discharged coating is measured,
The amount of extrusion per unit time from the extruder is calculated from the weight and the coating material discharge time, and the wire material is obtained in advance based on the calculated value and the material, wire type, wire diameter, etc. of the wire material covering the resin. Since the linear velocity of the wire rod running in the extruder is calculated based on the coating amount of the coating material coated on the surface, anyone can easily take out the coating resin taken out from the extruder for the linear velocity calculation. In addition, it is possible to prevent the error in the operation of taking out the coating resin and prevent the manufacturing error of the cable due to the calculation error of the linear velocity. A weighing machine for measuring the weight of the covering material extruded from the crosshead of the extruder, a time measuring machine for measuring the weighing time which starts at the start of weighing at the time of weighing and stops at the end of weighing, and a wire rod running in the extruder. A setter that sets the coating amount per unit length of the wire to be coated on the surface of the wire, which is determined by the wire type, wire diameter, etc. of the wire, the measured value measured by the measuring instrument, and the measurement measured by the time measuring instrument. Based on the time, the extrusion amount per unit time of the coating resin extruded from the crosshead of the extruder is calculated, and the resin extrusion amount per unit time and the coating amount per unit length of the wire rod set in the setting device are calculated. It consists of a calculator that calculates the linear velocity of the wire running in the crosshead of the extruder and the start and end time signal switches. It is possible to take off the coating resin at the time of overhaul without looking at the clock, making it easy for anyone to take out the coating resin taken out from the extruder for the purpose of calculating the linear velocity. By reducing the number, it is possible to prevent a manufacturing error of the cable due to an incorrect calculation of the linear velocity. Since the computing unit is provided with a display for displaying the linear velocity calculated by the computing unit, anyone can easily set the wire rod take-up speed to the speed setting unit with relative ease. Since the meter is connected to the meter and the meter integrated values measured by the meter are sequentially integrated unless reset, the material yield amount can be obtained in a short time.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a linear velocity calculation method for a traveling wire rod in an extruder and an apparatus therefor according to the present invention, and FIG.
FIG. 3 is an enlarged view of the touch bar switch of the linear velocity calculation device shown in FIG. 3, FIG. 3 is a circuit configuration diagram of the linear velocity calculation device shown in FIG. 1, and FIG. 4 is an extrusion coating start flowchart of the linear velocity calculation device shown in FIG. FIG. 5 is a diagram showing a conventional method for collecting coating resin at the time of overhaul, FIG. 6 is a diagram showing a method for calculating linear velocity using the conventional coating resin at the time of overhaul, and FIG. 7 is a conventional extrusion. FIG. 8 is a flowchart of the extrusion coating start by the method for calculating the linear velocity of the traveling wire rod in the machine, and FIG. 8 is an overall configuration diagram of the extruder. 1 …… Line velocity calculation device 2 …… Touch bar switch 3 …… Line velocity calculation device main unit 4 …… Measuring instrument 5 …… Measured value display 6 …… Time setting device 7 …… Extrusion speed display 8 …… Measuring Integrated value reset switch 9 …… Integrated amount display switch 10 …… Coating amount setting device 11 …… Line speed indicator 12 …… Printer 13 …… Print reset switch 14 …… Power switch 50 …… Time measuring device 51 …… Switch Switch 52 …… First arithmetic circuit 53 …… Set time measuring instrument 54 …… Integrator 55 …… Second arithmetic circuit 100 …… Extruder 190 …… Coating resin 300 …… Wire rod

Claims (4)

[Claims] 1. When quantitatively extruding and coating molten resin on a running wire rod, the coating material is discharged from an extruder for a predetermined time before running the wire rod, and the discharged coating material is weighed, The amount of extrusion per unit time from the extruder is calculated from the weight and the coating material discharge time, and the wire material is obtained in advance based on the calculated value and the material, wire type, wire diameter, etc. of the wire material covering the resin. A linear velocity calculation method for a traveling wire rod in an extruder, wherein a linear velocity of a wire rod running in the extruder is calculated based on a coating amount of a coating material coated on the surface. 2. A weighing machine for measuring the weight of a covering material extruded from a crosshead of an extruder, a time measuring machine for measuring a weighing time which starts at the start of weighing at the time of weighing and stops at the end of weighing, and the extruder. A setter that sets the coating amount per unit length of the wire rod that covers the surface of the wire rod, which is determined by the wire type, wire diameter, etc. of the wire rod that runs in the machine; The amount of extrusion of the molten resin extruded from the crosshead of the extruder per unit time is calculated from the measurement time measured in the above, and the amount of resin extrusion per unit time and the unit length of the wire rod set in the setting device are calculated. Of the traveling wire rod in the extruder, characterized in that it is constituted by a calculator for calculating the linear velocity of the wire rod traveling in the crosshead of the extruder based on the coating amount of Fast computing device. 3. The linear velocity calculating device for a traveling wire rod in an extruder according to claim 2, wherein the arithmetic unit is provided with a display for displaying the linear velocity calculated by the arithmetic unit. 4. The running wire rod in the extruder according to claim 2, wherein an integrating device is connected to the measuring device, and the integrated values measured by the measuring device are sequentially integrated unless reset. Linear velocity calculator.