JPH0721858A - Method for color change control in wire covering extruder, and method for preventing seizing of color changing valve in the wire covering extruder - Google Patents

Abstract

PURPOSE:To perform the color change of a covering resin without requiring hands by stopping a manufacturing line by the instruction from an operation board, at changing the color of the covering resin of a wire rod, and also conducting the switching operation of new and old resins in a resin extruder. CONSTITUTION:A covering resin is heated and molten by a resin extruder 2, and force-fed to a cross head 5 through a switching cock 20 to apply a covering to a wire rod 3000. When a color change command is inputted to an operation board 24 at changing the color of the covering resin, the operation board 24 outputs a color change operation signal and a manufacturing line stop signal to a hopper 1 and a solenoid valve 23. Thus, the manufacturing line is stopped, and the supply of the resin of a designated color from the hopper 1 is started. A driving means 22 is also driven to rotate the switching valve of the switching cock 20, the resin supply route to the cross head 5 is changed to a discharge route to the outside, and the old color resin is made overflow for a fixed time by a screw to exchange it with a new color resin. When the switching is completed, the switching valve is operated to supply the new color resin to the crosshead 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention supplies coated synthetic resin having different colors according to the colored synthetic resin supplied from the main extruder when coating the conductor with the synthetic resin, or in the form of stripes. When supplying a coated synthetic resin with a different color in place of the colored synthetic resin supplied from the main extruder, the switching device that connects and disconnects the route for supplying the colored coated synthetic resin is supplied from the main extruder. Control method in the wire coating extruder for switching to the colored synthetic resin supplied in place of the synthetic resin supplied, and switching of the colored synthetic resin supplied in accordance with the synthetic resin supplied to the die from the main extruder The present invention relates to a method for preventing seizure of a color change valve in an electric wire coating extruder for preventing seizure of the color change valve.

[0002]

2. Description of the Related Art Generally, electric wires and cables have a structure in which a conductor is covered with an insulator made of synthetic resin. This wire / cable has improved electrical stability, flexibility,
In order to improve the space factor (accommodate multiple cores in a small outer diameter), most of them are single-stranded cables, and most of them are stranded wires formed by twisting the core groups in various ways. In the case of this stranded cable, a plurality of electric wires and cables are twisted together and the outermost layer sheath made of synthetic resin (for example, polyvinyl chloride resin) is coated on the outside. When covering this sheath, a main resin extruder 1000 as shown in FIG. 8 is generally used. That is, the resin extruder 1000 has the crosshead 1
The cross head 1700 has a die 1100 attached thereto. This die 1
100 is a flange 112 at the rear end of the die body 1110.
0 is provided. Also, the die body 1110 is
The die body 1110 is formed in a tubular shape, and a taper portion 1130 is formed on the inner surface of the die body 1110 by providing a shape-retaining portion 1150 at a predetermined distance from the tip end opening 1140. The die body 11 is attached to the taper portion 1130 in the die body 1110.
Cylindrical nipple 14 at a predetermined distance from the inner surface of 10
00 is fitted. The die body 1110 and the nipple 1400 are arranged on the same center.

A die holder 1200 is engaged with a flange 1120 at the rear end of the die body 1110. An adjustment bolt 1300 is attached to the die holder 1200, and the adjustment bolt 1300 is for adjusting the deflection of the die body 1110. Also,
The nipple 14 fitted to the inner surface of the die body 1110
00 is fixed to the nipple holder 1500,
The nipple holder 1500 is fixed to the sleeve 1600. The extruded portion 1800 formed between the inner surface of the die body 1110 and the nipple 1400 is sequentially fed with the coating resin 2200 from the adapter portion 1900 through the switching cock 2000 through the pipe line 2100. There is. The pressure feeding of the coating resin 2200 is
This is done by rotating the screw. A resin colored in a pellet-like predetermined color is supplied to the screw from a hopper (not shown), and is heated and melted and extruded in the screw. A plurality of hoppers are provided according to the number of ground colors (for example, gray, white, etc.) of the coating resin, and the hoppers can be switched and supplied according to the selection of the ground color of the coating resin. Therefore, the coating resin 2200 sequentially pressure-fed from the adapter portion 1900 is applied to the surface of the wire rod 3000 that travels approximately in the center of the nipple 1400.
Coat at 150. A wire rod 30 in which the coating resin 2200 is coated on the shape-retaining portion 1150 of the die 1100.
00, after passing through the opening 1140 of the die 1100, the coating resin 2200 is cooled by contact with air,
Cure and shape.

When changing the color of the coating resin 2200 coated on the surface of the wire rod 3000, once the crosshead 17 is used.
The supply of the coating resin 2200 to 00 is stopped, the hopper containing the coloring material is changed to the instructed color, and the resin is newly supplied to the resin extruder 1000. Then, after changing the colored resin, the old color coating resin before changing the color is switched to the cock 2
000 discharge port (not shown), the operator visually checks the side until a new color coating resin is discharged, and judges that a completely new color coating resin is output. Then, the extrusion coating on the wire 3000 is restarted.

The switching cock 2000 is made of a coating resin 2200.
Is supplied to the crosshead 1700, and a part of the coating resin of the new color connected to the coating resin 2200 of the old color before changing the color is discharged. In addition, the switching cock 2000 uses the coating resin 2200 to cross the head 170.
In order to smoothly supply to 0, a heater is provided inside and the coating resin 2200 is appropriately heated to a temperature. This switching cock 2000 is switched by a spanner 250.
0 from the resin extruder 1000 to the crosshead 170
The supply path to 0 is changed to a discharge path from the resin extruder 1000 to the outside. When this switching cock 2000 is switched, the manufacturing line is stopped and the hopper containing the coloring material is switched before switching the switching cock 2000 to switch the colored coating resin supplied to the resin extruder 1000. Exchange. After that, switch the switching cock 2000,
The supply path from the resin extruder 1000 to the crosshead 1700 is changed to a discharge path from the resin extruder 1000 to the outside. By the switching of the switching cock 2000, the coating resin extruded by the screw of the resin extruder 1000 is discharged from the discharge port of the switching cock 2000. The resin first discharged from the discharge port of the switching cock 2000 is the coating resin of the old color before changing the color, and after a while, the resin in which the coating resin of the old color and the coating resin of the new color are mixed is discharged. Then, after a while, only the coating resin of the new color is discharged. When the worker confirmed that only this new color coating resin had been exhaled,
The worker switches the switching cock 2000 using the spanner 2500 to change the discharge path from the resin extruder 1000 to the outside to the supply path from the resin extruder 1000 to the crosshead 1700. By switching the switching cock 2000, the new color coating resin is supplied to the crosshead 1700. The manufacturing line is restarted at the same time when the switching cock 2000 is switched. In this way, the old color coating resin is switched to the new color coating resin.

By the way, such an electric wire / cable is
It is properly used depending on the purpose of use or the type of location. That is, when connecting one end of an electric wire / cable to a specific device and connecting the other end of the electric wire / cable to this device to another device or a power supply device, insulate the connection of the wire to be connected correctly. The body is colored in stripes. In the case of electric wires / cables, it is particularly important that the insulator is colored, because incorrect connection at the terminal or the connecting portion may cause a short circuit between wires.

The stripe-shaped coloring of this insulator was carried out by using a sub-extruder 5000 as shown in FIG. 9 to make the coating resin supplied from the main resin extruder 1000 the ground color, and coloring it in the stripe shape. It is formed by coating a coating resin. The coating of the colored coating resin is performed by the resin extruder 100.
When the coating resin is extruded from 0, the colored coating resin is extruded from the sub-extruder 5000 at the same time so as to be vertically arranged in a stripe shape. The stripes formed on the insulators and sheaths of the electric wires / cables are made of a resin colored in a color different from the ground color (eg, gray or white) of the insulator, for example, red or yellow. The colors of this stripe vary widely. Therefore, the sub extruder 5000 is also the main resin extruder 1000.
Similarly, a pellet-shaped resin colored in a predetermined color is supplied from the hopper into the screw, and is heated in the screw to be melted and extruded. In addition, a plurality of hoppers containing colored resin are provided in accordance with the number of stripe colors (for example, red, yellow, black, etc.) formed on the electric wire insulator or cable sheath. It is possible to switch and supply according to the selection of colors. Therefore, when changing the color of the stripe formed by coating on the surface of the wire rod 3000, the supply of the stripe forming resin to the crosshead 1700 is once stopped and the hopper for supplying the coloring material to the sub-extruder 5000 is switched. In the sub-extruder 5000, the colored stripe coating resin supplied from the hopper is extruded to the switching cock 6000 by the action of the screw. In changing the color of the stripe coating resin, the hopper containing the coloring material is switched to change the coloring resin, and then the old color coating resin before the color change is discharged and the new color coating resin is discharged. Up to this point, the worker visually checks the side, and when it is judged that the coating resin of a completely new color is output, the extrusion coating on the wire 3000 is restarted.

The switching cock 6000 stops the supply of the coating resin for stripes to the crosshead 1700, and discharges a part of the coating resin for stripes of a new color connected to the coating resin for old color stripes before the color change to the outside. belongs to. In addition, this switching cock 6000 is provided with the coating resin 2
In order to smoothly supply 200 to the crosshead 1700, a heater is provided inside and the coating resin 220
0 is heated to a suitable temperature. This switching cock 6000
Switching of the sub extruder 500 using the spanner 2500
The supply path from 0 to the crosshead 1700 is changed to a discharge path from the sub extruder 5000 to the outside. When the switching cock 6000 is switched, the switching cock 60
Before switching 00, the production line is stopped, the hopper containing the coloring material is switched, and the colored stripe coating resin supplied to the sub-extruder 5000 is replaced.
After that, the switching cock 6000 is switched, and the sub extruder 50
The supply path from 00 to the crosshead 1700 is changed to a discharge path from the sub extruder 5000 to the outside. By switching the switching cock 6000, the sub extruder 5000
The stripped coating resin extruded by the screw is discharged from the discharge port of the switching cock 6000.
The resin that is first discharged from the discharge port of the switching cock 6000 is the striped coating resin of the old color before changing the color,
After a while, the resin in which the old color stripe coating resin and the new color stripe coating resin are mixed is discharged, and after a while, only the new color stripe coating resin is discharged. When the worker confirms that only this new color stripe coating resin has been discharged, the worker uses the spanner 2500 to change the cock 60.
00 is switched to change from the discharge path from the sub extruder 5000 to the outside to the supply path from the sub extruder 5000 to the crosshead 1700. By switching the switching cock 6000, the coating resin for stripes of a new color is supplied to the crosshead 1700. At the same time as switching the switching cock 6000, the production line is restarted. In this manner, the old color stripe coating resin is switched to the new color stripe coating resin.

In addition, when a wire or cable is manufactured by forming a stripe on the surface of the resin that coats the wire rod 3000, and when the wire rod 3000 is coated with a plain resin to stop the formation of the stripe, a spanner is used. The switching cock 6000 is switched using 2500, and the supply path from the sub extruder 5000 to the crosshead 1700 is shifted so that the stripe coating resin is not supplied from the sub extruder 5000 to the crosshead 1700. To stop.

Thereafter, when a stripe is to be formed again on the surface of the resin coating the wire rod 3000, the spanner 250 is used.
0 to switch the switching cock 6000, the sub-extruder 5
The discharge route from 000 to the outside is changed to the supply route from the sub-extruder 5000 to the crosshead 1700, and
Operate the screws of the sub-extruder 5000.

[0011]

However, in the conventional coating method of the coating resin on the surface of the wire rod by the electric wire coating extruder, when the color of the coating resin 2200 coated on the surface of the wire rod 3000 is changed, coloring is performed. After changing the hopper containing the material and changing the colored resin, spit out the coating resin of the old color before changing the color and visually check the worker by the side until the coating resin of the new color is spitted out. Therefore, there is a problem in that the loss of the coating resin increases if the switching of the switching cock is delayed due to the trouble.

Further, in the conventional coating method of the coating resin on the surface of the wire material by the wire coating extruder, the color changing instruction and the cock switching are different works at different positions, so that the operator is burdened. Is too large.

Further, in the conventional method for coating the surface of the wire material with the coating resin by the wire coating extruder, the wire material 3000 is manufactured by forming the stripes on the surface of the resin that coats the wire material 3000. When the formation of stripes is stopped in order to manufacture an electric wire / cable coated with a plain resin, the switching cock 6000 is switched by the spanner 2500, and the supply route from the sub extruder 5000 to the crosshead 1700 is set to the sub extruder. The discharge route from 5000 to the outside was changed, and the sub extruder 5000
Stop the screw. After that, in the case of forming a stripe on the surface of the resin coating the wire rod 3000 again,
The spanner 2500 switches the switching cock 6000 to change the discharge path from the sub-extruder 5000 to the outside to the supply path from the sub-extruder 5000 to the crosshead 1700 and operate the screw of the sub-extruder 5000. In this way, when the stripe is not formed on the surface of the resin covering the wire rod 3000, the switching cock 6
000 with a spanner 2500 to stop the coating resin for stripes at the switching cock 6000,
There is a problem in that the coating resin for stripes on the portion of the switching cock 6000 is seized and the switching cock 6000 cannot rotate.

The present invention is a color change in an electric wire coating extruder in which a switching cock can be opened and closed without requiring manpower to switch to a colored synthetic resin supplied in place of the synthetic resin supplied from the main extruder. Control method, and a color change control method in an electric wire coating extruder capable of easily extracting an untrue product of a portion switched to a colored synthetic resin supplied in place of the synthetic resin supplied from the main extruder, and The resin extruding from the sub extruder is stopped for a long time by switching the switching cock that switches and switches the stripe coating resin supplied from the sub extruder according to the synthetic resin supplied from the main extruder to the crosshead. Even so, it is an object of the present invention to provide a method for preventing seizure of a color change valve in an electric wire coating extruder, which can prevent seizure of a switching cock.

[0015]

In order to achieve the above object, a method of controlling color change in an electric wire coating extruder according to the present invention is based on a color change command from an operation panel, in which different colored coating resins are used. Of the plurality of stored hoppers, the hopper in which the specified colored coating resin is stored is opened, the coating resin is supplied into the screw cylinder, the manufacturing line is stopped, and the driving means is stopped when the manufacturing line is stopped. Rotate the switching cock to change the supply path of the coating resin to the crosshead to the discharge path from the resin extruder to the outside, and discharge the old color coating resin remaining in the preset cylinder. Then, after the color change time until switching to the new color coating resin has elapsed, the switching cock is rotated again by the driving means and the discharging route of the coating resin from the resin extruder to the outside is crossed to the crosshead. Change in the supply path, in which so as to resume the production line.

In order to achieve the above object, the color change control method in the electric wire coating extruder of the present invention is based on a color change command from the operation panel, and a plurality of different colored coating resins are stored in each of them. Open the hopper that contains the specified colored coating resin in the hopper, supply the coating resin into the screw cylinder, and record the hopper switching time, and leave it in the preset cylinder. Calculate the length of the running wire / cable from the hopper switching to the color change time based on the color change time until the old color coat resin is discharged and the new color coat resin is switched to,
The location of the electric wire / cable to be removed is recorded based on the calculation result.

Further, in order to achieve the above object, a method for preventing seizure of a color change valve in an electric wire coating extruder according to the present invention is based on a command from an operation panel and is used for a ground color supplied from a main extruder. After stopping the colored stripe coating resin supplied from the sub-extruder according to the coating resin of
The switching cock of the coating resin for stripes is reciprocally rotated by a predetermined angle by a driving means every time a predetermined time elapses until the stripe is restarted.

[0018]

[Function] Based on the color change command from the operation panel, the hopper containing the designated colored coating resin is opened among the plurality of hoppers containing the different colored coating resins, and the relevant coating resin is opened. While supplying into the screw cylinder and stopping the production line, the switching cock is rotated by the drive means when the production line is stopped and the supply route of the coating resin to the crosshead is changed to the discharge route from the resin extruder to the outside. After changing the color change time until the old color coating resin remaining in the preset cylinder is discharged and switched to the new color coating resin, the driving means rotates the switching cock again to cover Since the discharge route of resin from the resin extruder to the outside is changed to the supply route to the crosshead and the production line is restarted, the synthetic resin supplied from the main extruder is used. Switching to supply colored synthetic resin can be opened and closed switching cock without requiring human intervention in place.

Further, based on a color change command from the operation panel, among the plurality of hoppers each containing a coating resin of a different color, the hopper in which the coating resin of a specified color is stored is opened and the coating is performed. Based on the color change time until the resin is supplied into the screw cylinder and the hopper switching time is recorded, and the old color coating resin remaining in the cylinder is discharged and switched to the new color coating resin. Since the length of the running electric wire / cable from the time of switching the hopper to the passage of the color change time is calculated and the position of the electric wire / cable to be removed is recorded based on the calculation result, it is supplied from the main extruder. It is possible to easily extract the untrue product in the portion switched to the colored synthetic resin to be supplied instead of the synthetic resin.

Further, based on a command from the operation panel, after stopping the colored strip coating resin supplied from the sub-extruder in accordance with the ground-color coating resin supplied from the main extruder, a predetermined time is given. Since the switching cock is reciprocally rotated by a preset angle by the driving means every time, the stripe coating resin supplied from the sub-extruder in accordance with the synthetic resin supplied from the main extruder to the crosshead. It is possible to prevent seizure of the switching cock even when the resin extruding from the sub-extruder is stopped for a long time by switching the switching cock that performs the intermittent / switching.

[0021]

EXAMPLES Examples of the present invention will be described below. << First Invention >> FIGS. 1 and 2 show an embodiment of a color change control method in an electric wire coating extruder according to the first invention of the present application.

In the figure, 1 is a hopper and 2 is a main resin extruder. A plurality of the hoppers 1 are provided, and each of them stores a pellet-shaped resin colored in a predetermined color. That is, the hopper 1 is
A plurality of coating resins are provided according to the number of ground colors of the coating resin (for example, gray, white, etc.), and the resin pellets can be supplied to the resin extruder 2 by switching according to the selection of the ground color of the coating resin. It has become. Further, the resin extruder 2 is
The pellet-shaped resin is supplied from one of the plurality of hoppers 1, heated and melted in the screw cylinder 3, and extruded while being pressed by the screw 4.
The resin extruder 2 has a crosshead 5. The crosshead 5 covers the wire rod 3000 with the coating resin 6 that is heated and melted in the screw cylinder 3 of the resin extruder 2.

The die 7 is attached to the tip of the crosshead 5.
Is attached. This die 7 is provided with a flange 9 at the rear end of the die body 8. The die body 8 is formed in a tubular shape, and the inner surface of the die body 8 is provided with a shape-retaining portion 11 at a predetermined distance from the tip opening 10 to form a taper portion 12. A cylindrical nipple 13 is fitted to the tapered portion 12 in the die body 8 at a predetermined distance from the inner surface of the die body 8. The die body 8 and the nipple 13 are arranged on the same center.

A die holder 14 is engaged with the flange 9 at the rear end of the die body 8. An adjustment bolt 15 is attached to the die holder 14, and the adjustment bolt 15 is for adjusting the deflection of the die body 8. Further, the nipple 13 fitted to the inner surface of the die body 8 is fixed to the nipple holder 16,
The nipple holder 16 is fixed to the sleeve 17. The coating resin 6 is sequentially pressure-fed to the extruding portion 18 formed between the inner surface of the die body 8 and the nipple 13 from the adapter portion 19 through the switching cock 20 and the pipeline 21. There is. This switching cock 20
Has a switching valve formed in the shape of a rod with a passage formed therein, and is opened and closed by rotating the switching valve by a predetermined angle. The pressure feeding of the coating resin 6 is performed by rotating the screw 4. To the screw 4, a pellet-shaped resin colored in a predetermined color is supplied from a hopper 1 (not shown), and is heated in the screw 4 to be melted and extruded.
A plurality of hoppers 1 are provided according to the number of ground colors (for example, gray, white, etc.) of the coating resin, and the hoppers 1 can be switched and supplied according to the selection of the ground color of the coating resin. Accordingly, the shape-retaining portion 11 of the die 7 coats the surface of the wire rod 3000 running substantially in the center of the nipple 13 with the coating resin 6 sequentially fed from the adapter portion 19. The wire rod 3000 coated with the coating resin 6 in the shape-retaining portion 11 of the die 7 is cooled by the coating resin 6 coming into contact with air after passing through the opening 10 of the die 7, and the coating resin 6 is cured and shaped.

Reference numeral 22 denotes a drive means for rotating the switching valve of the switching cock 20 by a predetermined angle. In this embodiment, it is a pneumatic device which performs a rocking motion and is constituted by a rocking cylinder. That is, the oscillating cylinder in the present embodiment can change linear motion into rotary motion, for example,
It has a built-in rack and pinion. Reference numeral 23 is a solenoid valve for controlling the drive of the drive means 22. That is, the solenoid valve 23 controls the flow of air supplied to the swing cylinder.

An operation panel 24 controls the solenoid valve 23, inputs a color change command, changes the color of the hopper 1 in response to the input of the color change command, and issues a line stop / start command. It is a control device.

Next, the operation of this embodiment will be described.

When the color of the coating resin 6 coated on the surface of the wire rod 3000 is to be changed, a color change command is input to the operation panel 24. In response to this color change command input, the operation panel 24 outputs a color change operation signal to the hopper 1 and the solenoid valve 23, and also outputs a line stop signal for stopping the production line to the line control device. The production line is stopped by this line stop signal. In addition, the hopper 1 in which the pellet-shaped resin colored in accordance with the color change operation signal is stored is moved to or opened in the charging port of the resin extruder 2, and the pellet-shaped resin extruder 2 is pressed. Start supplying resin. At the same time, the electromagnetic valve 23 operates based on the color change operation signal to drive the drive means 22 and rotate the switching valve of the switching cock 20 by a predetermined angle to supply the resin from the resin extruder 2 to the crosshead 5. The route is changed to a discharge route from the resin extruder 2 to the outside. Then,
The supply of the coating resin 6 from the resin extruder 2 to the crosshead 5 is stopped, and in the resin extruder 2, the colored coating resin 6 supplied from the hopper 1 is discharged to the outlet of the switching cock 20 by the action of the screw 4. Push out. Therefore, the screw 4 causes the old color resin to overflow for a certain period of time (color change time) until it is replaced with the new color resin, that is, until the color change is completed, the overflow is performed for a certain period of time.

This control flow chart is shown in FIG. In FIG. 3, when the manufacturing line is started, necessary data such as color changing conditions are read in step 100. Next, at step 101, the drive of the main extruder 2 is controlled. When the main extruder 2 is driven, it is determined in step 102 whether or not there is a color change instruction. If it is determined in step 102 that there is no color change instruction, the process returns to step 101. If it is determined in step 102 that the color change instruction has been issued, the manufacturing line is stopped in step 103, and in step 104, the hopper 1 containing the resin of the color designated based on the color change instruction is moved or opened. Speak.

When the hopper 1 in which the resin of the specified color is stored moves, in step 105, the color change time (until the color change is completed) is changed depending on the color change condition (how many colors are changed to what color). (Certain time) is calculated. These color change times can be set as empirical values, such as about 40 seconds when changing from white to pink and about 55 seconds when changing from pink to black. When the color change time is calculated based on the color change condition in step 105, the electromagnetic valve 23 is opened and the driving means 22 is driven to set the overflow position in step 106.

Next, in step 107, it is judged whether or not the color changing time calculated in step 105 has elapsed,
When it is determined in step 107 that the color changing time has elapsed, in step 108, the solenoid valve 23 is operated to drive the driving means 22 to rotate the switching valve of the switching cock 20 by a predetermined angle to move the resin extruder 2 to the outside. The discharge route of is changed to the supply route from the resin extruder 2 to the crosshead 5. Then, in step 109, the line is started.
Further, in step 110, it is determined whether or not the line is stopped, and manufacturing is continued until the line is stopped.

Therefore, according to this embodiment, it is possible to open and close the switching cock without manpower for switching to the colored synthetic resin supplied in place of the synthetic resin supplied from the main extruder.

<< Second Invention >> FIG. 4 shows an embodiment of a color change control method in an electric wire coating extruder according to the second invention of the present application.

The present invention is different from the first invention of the present application shown in FIG. 1 in that the color changing is performed without stopping the production line. Therefore, when changing the color of the coating resin, it is not necessary to operate the solenoid valve 23 based on the color change operation signal to drive the driving means 22 and rotate the switching valve of the switching cock 20.

In the figure, when the production line is started, in step 200, necessary data such as color changing conditions are read. Next, at step 201, the drive of the main extruder 2 is controlled. When the main extruder 2 is driven, it is determined in step 202 whether or not there is a color change instruction. In step 202, the process waits until there is a color change instruction. When it is determined in step 202 that there is a color change instruction, in step 203, the hopper 1 in which the resin of the color specified based on the color change instruction is stored is moved or opened to remove the resin in the hopper 1. Supply. Then, when the resin in the hopper 1 is supplied in step 203, in step 204,
Record the start time of resin supply into the hopper 1. Then, when the resin supply start time is recorded in step 204, the length of the electric wire / cable when the color change time has elapsed is calculated and displayed in step 205. Therefore, by discarding the length of the electric wire / cable calculated from the position at the time of starting the resin supply, it is possible to obtain the electric wire / cable whose color is completely changed.

<Third Invention> FIG. 5 shows an embodiment of a seizure prevention method for a color change valve in an electric wire coating extruder according to the third invention of the present application.

In the figure, the structure relating to the main resin extruder 2 is the same as the structure of the first invention of the present application shown in FIG.

Reference numeral 30 is a hopper, and 31 is a sub resin extruder. A plurality of the hoppers 30 are provided, and each of them stores a pellet-shaped resin colored in a predetermined color. That is, a plurality of hoppers 30 are provided according to the number of colors (for example, red, yellow, etc.) of the coating resin for stripes. It can be supplied to the extruder 31. Further, the sub-extruder 31 is supplied with pelletized resin from one of the plurality of hoppers 30, is heated and melted in the screw cylinder, and is extruded while being pressurized by the screw. The resin extruder 31 has a crosshead 50. The cross head 50 coats the wire rod 3000 with the coating resin 6 heated and melted in the screw cylinder 3 of the resin extruder 2 and simultaneously coats the stripped coating resin 40 heated and melted in the screw cylinder of the sub-extruder 31. Thinly extruded so as to be covered in a stripe shape, and as shown in FIG. 6, the wire material 3000 is covered with the covering resin 6 in a stripe shape together with the covering resin 6.

Reference numeral 32 denotes a switching cock, which is a valve for controlling the on / off of supply of the coating resin for stripes from the sub extruder 31 to the crosshead 50. Therefore, a heater is built in the switching cock 32 and is constantly heated to a constant temperature so that the stripe coating resin can be supplied immediately when the command is supplied. A switching valve 33 is rotatably fitted in the switching cock 32, and an overflow hole 34 is provided in the switching valve 33. Therefore, the switching cock 32 has the switching valve 33.
And a discharge path for discharging the stripe coating resin 40 through the sub extruder 31 to the overflow hole 34 from a supply path for supplying the stripe coating resin 40 to the crosshead 50 through the sub extruder 31. Or change from a discharge path for discharging the stripe coating resin 40 to the overflow hole 34 through the sub extruder 31 to a supply path for supplying the stripe coating resin 40 to the crosshead 50 through the sub extruder 31. It is something to do.

The switching valve 33 of the switching cock 32 is rotated by a predetermined angle, and the supply path for supplying the stripe coating resin 40 to the crosshead 50 through the sub extruder 31 is passed through the sub extruder 31 to the overflow hole 34. When the discharge route for discharging the stripe coating resin 40 is changed, the supply of the stripe coating resin 40 from the sub-extruder 31 to the crosshead 50 is stopped, and in the sub-extruder 31, the colored resin supplied from the hopper 30 is supplied. The coating resin 40 for stripes is pushed out to the switching cock 32 by the action of the screw. Therefore, until the old color stripe coating resin 40 overflows for a certain time (color change time) by the action of the screw and is replaced with the new color stripe coating resin 40, that is, until the color change is completed, the stripe coating resin 40 Overflow 40.

Reference numeral 35 denotes a driving means for rotating the switching valve 33 of the switching cock 32 by a predetermined angle. In this embodiment, a pneumatic device which performs a rocking motion is constituted by a rocking cylinder, but other driving means. Means may be used. That is, the swing cylinder according to the present embodiment is configured, for example, with a built-in rack and pinion so that linear motion can be converted into rotary motion. A solenoid valve 36 controls the driving of the driving means 35. That is, the solenoid valve 36 controls the flow of air supplied to the swing cylinder.

An operation panel 24 controls the solenoid valves 23 and 36, inputs a color change command, changes the color of the hopper 1 in response to the input of the color change command, and issues a line stop / start command. It is a control device.

Next, the operation of this embodiment will be described.

The operation relating to the main resin extruder 2 is as follows.
Since it is the same as the operation of the first invention of the present application or the second invention of the present application shown in FIG. 1, the description of the operation will be omitted.

When changing the color of the stripe coating resin 40 to be included in the coating resin 6 coated on the surface of the wire rod 3000, a color changing command is input to the operation panel 24. In response to this color change command input, the operation panel 24 outputs a color change operation signal to the hopper 30 and the solenoid valve 36, and also outputs a line stop signal for stopping the production line to a line control device (not shown). The production line is stopped by this line stop signal. Further, the hopper 30 in which the pellet-shaped stripe coating resin colored in accordance with the color change operation signal is stored moves to the input port of the sub-extruder 31, and the sub-extruder 31 is pelletized. The supply of the coating resin for stripes is started. At the same time, the electromagnetic valve 36 operates based on the color change operation signal to drive the driving means 35, rotate the switching valve 33 of the switching cock 32 by a predetermined angle, and supply the sub extruder 31 to the crosshead 50. The path is changed to the discharge path from the sub extruder 31 to the overflow hole 34. Then, from the sub extruder 31 to the crosshead 50
The supply of the coating resin for stripes 40 to the above is stopped, and in the sub-extruder 31, the colored coating resin for stripes 40 supplied from the hopper 30 is pushed out to the switching cock 32 by the action of the screw. Therefore, by the action of the screw, the coating resin for stripes of the old color is allowed to overflow for a certain period of time (color change time) and is changed to the coating resin for stripes of the new color, that is, until the color change is completed, it is overflowed for a certain period of time.

This control flow chart is shown in FIG. In FIG. 7, when the manufacturing line starts, in step 300, necessary data such as color changing conditions are read. Next, in step 301, it is determined whether or not there is an instruction to have a stripe. This step 3
At 01, the process waits until an instruction indicating that there is a stripe is issued.
In this step 301, when an instruction to have a stripe is issued, in step 302 the sub-extruder 31 is driven and controlled. When the sub extruder 31 is driven, step 30
In 3, it is judged whether or not the stripe attaching is completed. When it is determined in step 303 that the attaching of stripes is completed, it is determined in step 304 whether or not there is a color change instruction, that is, whether or not the color of the currently attached stripe is changed. If there is a color change instruction in step 304, the process moves to step 305 and the manufacturing line is stopped.

If it is determined in step 303 that the striping has not been completed, step 306
At, it is determined whether or not there is a color change instruction, that is, whether or not to change the color of the currently attached stripe. If it is determined in step 306 that there is no color change instruction, the process returns to step 303. If it is determined in step 304 that there is a color change instruction, the process moves to step 305 and the manufacturing line is stopped.

When the production line is stopped in step 305, in step 307, the hopper 30 accommodating the coating resin for stripes of the color designated based on the color change instruction moves or opens, and the color change condition (what The color change time (a fixed time until the color change is completed) is calculated according to how many colors have been changed. These color change times are empirical values, and about 4 when changing from white to pink.
It can be set to 0 seconds, and about 55 seconds when changing from pink to black. In step 307, the color change time is calculated according to the color change condition, and at the same time, the solenoid valve 3
6 is opened and the driving means 35 is driven to set at the position of the overflow hole 34.

Next, in step 308, it is determined whether or not the color change time calculated in step 307 has elapsed,
When it is determined in step 308 that the color changing time has elapsed, in step 309, the solenoid valve 36 is operated to drive the driving means 35 to rotate the switching valve 33 of the switching cock 32 by a predetermined angle and overflow from the sub extruder 31. Hole 3
4 to the crosshead 50 from the sub-extruder 31
Change to the supply route to. Then start the line. Further, in Step 310, it is determined whether or not the production line is stopped. If the production line is stopped, the flow is ended, and if it is determined that the production line is not stopped, Step 3
Return to 03.

If it is determined in step 304 that there is no color change instruction, the process proceeds to step 311, and the switching cock 32 is closed. That is, the electromagnetic valve 36 is operated to drive the drive means 35 to rotate the switching valve 33 of the switching cock 32 by a predetermined angle to close the supply path from the sub extruder 31 to the crosshead 50. Switching cock 3 in step 311
When step 2 is closed, it is determined in step 312 whether or not there is an instruction to form a stripe on the electric wire / cable to be manufactured. If it is determined in step 312 that there is an instruction to form stripes, step 3
Return to 02. If it is determined in step 312 that there is no stripe formation instruction, step 31
After waiting a preset time in 3, the switching valve 33 of the switching cock 32 is rotated in step 314 to such an extent that the supply path from the sub extruder 31 to the crosshead 50 is not opened. This switching cock 32
The reciprocating motion of the switching valve 33 is more effective. Then, the process returns to step 312, and the switching cock 3 is rotated at regular intervals until an instruction to form a stripe is issued.
The switching valve 33 of No. 2 from the sub extruder 31 to the crosshead 50
It is rotated by an angle within a range that does not open the supply path to.

Therefore, according to this embodiment, when the coating resin for stripes is not supplied from the sub-extruder 31 to the crosshead 50 through the switching cock 32, it is heated in the switching cock 32 at a constant temperature. It is possible to prevent the coating resin for stripes from being seized.

[0052]

According to the first aspect of the present invention, the specified colored coating resin is stored in the plurality of hoppers in which the different colored coating resins are stored based on the color change command from the operation panel. The hopper is opened to supply the coating resin into the screw cylinder and the manufacturing line is stopped. When the manufacturing line is stopped, the switching cock is rotated by the driving means to supply the coating resin to the crosshead. Is changed to a discharge path from the resin extruder to the outside, and after the color change time until the old color coating resin remaining in the preset cylinder is switched to the new color coating resin is passed, Since the switching cock is rotated by the driving means to change the discharge route of the coating resin from the resin extruder to the outside to the supply route to the crosshead, and the production line is restarted, Switching to colored synthetic resin supplied in place of the synthetic resin supplied from an extruder can be opened and closed switching cock without requiring human intervention.

According to the second aspect of the present invention, the specified colored coating resin is stored in the plurality of hoppers in which the different colored coating resins are stored based on the color change command from the operation panel. Open the hopper to supply the coating resin into the screw cylinder and record the hopper switching time, and discharge the old color coating resin remaining in the preset cylinder and switch to the new color coating resin. The length of the running electric wire / cable from the time when the hopper is switched to the color change time elapses is calculated based on the color change time, and the location of the electric wire / cable to be removed is recorded based on the calculation result. , The unauthentic product in the portion switched to the colored synthetic resin supplied in place of the synthetic resin supplied from the sub extruder can be easily extracted.

According to the third invention of the present application, based on the instruction from the operation panel, the colored strip coating resin supplied from the sub extruder in accordance with the ground color coating resin supplied from the sub extruder. After stopping the operation, the switching cock of the coating resin for stripes is reciprocally rotated by a predetermined angle by the driving means every time a certain time elapses until the stripe is restarted, so that it is supplied from the sub extruder to the crosshead. To prevent seizure of the switching cock even if the resin extruding from the sub extruder is stopped for a long time by switching the switching cock that switches and switches the coating resin for stripes supplied from the sub extruder according to the synthetic resin You can

[Brief description of drawings]

FIG. 1 is an overall configuration schematic diagram showing an embodiment of a color change control method in an electric wire coating extruder according to the first invention of the present application.

FIG. 2 is a plan view showing the overall configuration of the embodiment shown in FIG.

FIG. 3 is a control flowchart of the embodiment shown in FIG.

FIG. 4 is a control flowchart showing an embodiment of a color change control method in the wire coating extruder according to the second invention of the present application.

FIG. 5 is a schematic diagram showing the overall configuration of an embodiment of a seizure prevention method for a color change valve in an electric wire coating extruder according to the third invention of the present application.

6 is a cross-sectional view of electric wires and cables discharged from the crosshead in the embodiment shown in FIG.

FIG. 7 is a control flowchart of the embodiment shown in FIG.

FIG. 8 is a plan view showing the overall configuration of a conventional wire coating extruder for coating a conventional wire / cable with resin.

FIG. 9 is an overall schematic view of an electric wire coating extruder for extruding and covering a resin for stripes at the same time when a conventional electric wire / cable is coated with resin.

[Explanation of symbols]

1,30 …………………………………………………… Hopper 2 ……………………………………………………………… Resin extrusion Machine 3 ……………………………………………………………… Screw cylinder 4 ………………………………………………………… … Screw 5,50 …………………………………………………… Crosshead 6 ………………………………………………………… … Coating resin 7 ……………………………………………………………… Die 20, 32 …………………………………………………… Switching cock 21 ………………………………………………………… Pipeline 22,35 …………………………………………………… Drive Means 23, 36 …………………………………………………… Solenoid valve 24, 37 …………………………………… ………………… Control panel 31 ………………………………………………………… Sub-extruder 33 …………………………………… …………………… Switching valve 34 ………………………………………………………… Overflow hole 40 …………………………………… …………………… Stripe coating resin 3000 …………………………………………………… Wire

Claims (3)

[Claims] 1. Based on a color change command from an operation panel, a hopper accommodating a coating resin of a specified color is opened among a plurality of hoppers respectively accommodating coating resins of different colors, and the coating is performed. The resin is supplied into the screw cylinder and the production line is stopped. When the production line is stopped, the switching cock is rotated by the driving means and the supply route of the coating resin to the crosshead is discharged from the resin extruder to the outside. After changing the route, the old color coating resin remaining in the preset cylinder is discharged, and after the color changing time until switching to the new color coating resin, the switching cock is rotated again by the driving means. Change control method for wire coating extruder in which the discharge route of the coating resin from the resin extruder to the outside is changed to the supply route to the crosshead and the production line is restarted. . 2. Based on a color change command from the operation panel, a hopper accommodating a coating resin of a designated color is opened among a plurality of hoppers respectively accommodating coating resins of different colors, and the coating is performed. Based on the color change time until the resin is supplied into the screw cylinder and the hopper switching time is recorded, and the old color coating resin remaining in the cylinder is discharged and switched to the new color coating resin. An electric wire coating extruder, wherein the length of the running electric wire / cable from the time of switching the hopper to the passage of the color changing time is calculated, and the position of the electric wire / cable to be removed is recorded based on the calculation result. Color change control method in. 3. The stripe is restarted after stopping the colored stripe coating resin supplied from the sub-extruder in accordance with the ground color coating resin supplied from the main extruder, based on a command from the operation panel. A method for preventing seizure of a color change valve in an electric wire coating extruder, in which the switching cock of the coating resin for stripes is reciprocally rotated at a preset angle by a driving means every time a predetermined time elapses.