JP2003168331A - Manufacturing equipment for high-frequency cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide manufacturing equipment for a high-frequency cable generating no shape change in a corrugated pipe in order to maintain and improve electric characteristics of a cable. <P>SOLUTION: This manufacturing equipment is equipped with a corrugating machine 6 for corrugating a pipe body 1; a taking-in device 7 taking-in the corrugated pipe 2 sent from the corrugating machine 6 on the downstream side; and a control means S detecting an axial direction thrust force applied to the taking-in device 7 from the corrugated pipe 2 with a measuring device 4 and controlling the taking-in velocity of the taking-in device 7 so as to make the axial direction thrust force constant. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a high frequency cable manufacturing apparatus.

[0002]

2. Description of the Related Art A corrugated waveguide or corrugated cable for high frequency transmission is provided with a corrugated tube (corrugated tube) having an oval or circular cross section. This corrugated cable for high-frequency transmission has low transmission loss and VSWR (Volt S
Strict performance such as good tanding wave ratio) characteristics is required.

A conventional manufacturing apparatus of a coaxial cable 10 for high frequency transmission having a corrugated tube 2 having a circular cross section as shown in FIG.
It is as follows. Explaining it with reference to FIG. 2, a core member 13 composed of a conductor wire 11 as an inner conductor and an insulator 12 such as foamed polyethylene which is externally fitted and covered on the conductor wire 11 has a circular cross section so as to wind a tape-shaped copper plate. An outer conductor (14) having a predetermined circular cross section is formed into a pipe and surrounds and covers the core member (13). This is then welded with a welding torch so that a longitudinal seam is formed, forming a waveless (smooth surface) tube. Then, as shown in FIG. 4, conventionally, this waveless tube 41 (workpiece) is sent out in the direction of the arrow by the endless track type feeding device 42 and is arranged on the downstream side of the endless track type feeding device 42. With the corrugating machine 43, the corrugated pipe 41 is corrugated in a ring shape. Corrugated pipe 44 exiting corrugating machine 43
Is applied with a predetermined tension via the dancer 45, and is wound by the winder 46.

Further, the endless track type feeding device 42 and the corrugating machine 43
Both of the power transmission drive systems of No. 1 and No. 2 are composed of a drive motor and a device such as a speed reducer and a clutch interposed between them, and the endless track type feeding device 42
And the corrugated machine 43 was connected.

[0005]

In the conventional apparatus shown in FIG. 4, the corrugating machine 43 is fixed to the base 47, and the corrugating machine 43 is used.
Since the corrugated work speed of is constant, the pipe 41 and corrugated pipe
When the traveling speed (feed speed) of 44 (work) changes, the corrugated machine 43 performs corrugation work at a predetermined speed (predetermined pitch), but the pipe 41 and corrugated pipe 44 are axially oriented. The compressive force and the tensile force in the axial direction act on the wave pitch of the corrugated pipe 44 and the corrugated pipe 44.
A change in shape occurs in the diameter dimension of the. Also,
If a speed reducer, clutch, etc. are interposed between the drive motor and the endless track type feeding device 42 and the corrugated machine 43, periodic rotation fluctuation due to tooth contact of gears (especially spur gears) of the speed reducer etc. may occur. However, there is a possibility that the rotation of the drive system becomes periodic and the speed of the work fluctuates, which deteriorates the VSWR characteristics.
Further, on the downstream side of the corrugating machine 43, tension is applied to the corrugating tube 44 by the dancer 45, and when the vibration is transmitted to the corrugating tube 44 and the corrugating machine 43 by the operation (vibration) of the dancer 45, the winding is performed. Opportunity
The wave pitch of the corrugated tube 44 wound around the coil 46 was periodically varied, and the wave pitch could not be made uniform with high accuracy.

As described above, the VSWR of the high frequency cable
Although the characteristics are severely limited, if the wave pitch of the corrugated tube 44 is not uniform or if there is a periodic fluctuation in the wave pitch, reflection of transmitted radio waves etc. easily occurs and electrical characteristics become poor,
There is a problem that the VSWR characteristics cannot be maintained above a certain value. Further, in the conventional device, VSWR
There is a problem that the characteristics cannot be further improved.

Therefore, an object of the present invention is to provide a high-frequency cable manufacturing apparatus which does not cause a change in shape of the corrugated tube in order to maintain and improve the electrical characteristics of the cable.

[0008]

In order to achieve the above-mentioned object, a high-frequency cable manufacturing apparatus according to the present invention comprises a corrugating machine for corrugating a pipe, and a corrugating machine sent from the corrugating machine. A take-up device for taking the attached pipe downstream is provided, and further,
The take-up device is provided with control means for detecting the axial thrust received from the corrugated pipe by a measuring instrument and controlling the take-up linear velocity of the take-out device so as to make the axial thrust constant.

The load device is a load cell in which the take-up device is in a floating state and the measuring device for detecting the axial thrust force received by the take-up device from the corrugated pipe is used. Also,
A feeding device for feeding the pipe body to the corrugating machine is disposed on the upstream side of the corrugating machine, and the power transmission drive systems of the feeding device, the corrugating machine, and the take-off device are provided for respective driving motors. It is directly connected to the output shaft.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in detail based on the illustrated embodiments.

FIG. 1 shows an embodiment of an apparatus for manufacturing a corrugated coaxial cable which is a high frequency cable, and FIG. 2 is a sectional perspective view of the corrugated coaxial cable manufactured by this apparatus or the like.
Shown in. As shown in FIG. 2, the corrugated coaxial cable 10 includes a core member 13 having a conductor wire (copper wire or copper tube) 11 as an inner conductor and an insulator 12 such as foamed polyethylene outside the outer conductor (copper tube). 14 is a corrugated pipe (corrugated cable) 2 having a corrugated surface and a corrugated surface, and the corrugated pipe 2 has an outer insulating layer.
15 are coated.

Explaining the manufacturing apparatus of FIG. 1, reference numeral 16 is a core member feeding machine for feeding a core member 13 wound around a drum in the direction of arrow a (downstream direction), and the fed core member 13 is a dancer. External conductor winding part 18 through 17
Sent to. On the other hand, 19 is a metal tape 23 wound around a drum, which will later become the outer conductor 14, in the direction of arrow b (downstream of the apparatus).
It is a metal tape supply that is sent out to the. The sent metal tape 23 is the tape cleaning unit 20, the trimming cutter 21.
Is sent to the outer conductor winding part 18 via. The trimming cutter 21 cuts a metal tape 23 into a predetermined width to form a strip-shaped metal tape 23 '. The residual material 24 cut by the trimming cutter 21 is wound by the scrap winder 22. Although not shown, the core member feeder 16 and the metal tape supply 19 are provided with a stock core member 13 and a metal tape 23 in the vicinity of their respective working positions. As a result, it is possible to stably manufacture the cable without stopping the production work for a long time.

Next, in the outer conductor winding portion 18, the strip-shaped metal tape 23 'is gradually wound by the tape forming device 25 from the strip plate shape to a circular cross-section so that both edges thereof approach each other. To be done. Then, in the middle of the pipe forming process of the strip-shaped metal tape 23 ', the core member 13 is taken into the center thereof, and the tubular outer conductor 14 is formed on the outer surface side of the core member 13. In addition,
The tape forming device 25 is of a roll type, a triangle former type, or the like. And sent from the outer conductor winding part 18,
The outer conductor 14 containing the core member 13 is welded to the joint (butting portion) of the outer conductor 14 by the welding torch 26 to form the smooth tubular body 1 having a longitudinal weld seam and a smooth surface. .

The tube 1 is then sent to the corrugating molding device section 9,
The corrugated processing is applied to the tubular body 1. This corrugated forming device section 9
As shown in the side view of the corrugated forming device unit 9 in FIG. 3, the tubular body 1 in which the outer conductor 14 is externally fitted to the core member 13 on the base 33 is shown.
Of the corrugated pipe 5 that feeds the water to the downstream side, the corrugating machine 6 that corrugates the surface of the pipe body 1 fed by the feeding device 5, and the corrugated pipe 2 that is fed from the corrugating machine 6. Collection device 7
Are fixed in a line from the upstream side to the downstream side. The feeding device 5 and the take-up device 7 are endless track type (caterpillar type) feeding (take-off) machines, and the traveling portions (contact portions) of the pipe body 1 and the corrugated pipe 2 are the pipe body 1 and It corresponds to the cross-sectional shape of the corrugated pipe 2, and the pipe body 1 and the corrugated pipe 2 are held while maintaining the cross-sectional shape. The waveform applied by the corrugating machine 6 is an independent protruding annular wave. Alternatively, it may have a spiral shape.

The delivery device 5 will be described. The delivery device 5 has a pair of an upper delivery device 5a and a lower delivery device 5b for sandwiching the pipe body 1 in the vertical direction and running the pipe body 1 in the direction of arrow c. and a infeed machine motor M _1, M ₁ to. Each infeed device 5a of the infeed device 5, 5b power transmission drive system shall infeed machine motor M _1, M ₁ of the output shaft becomes direct drive. That is, the output shafts of the feeder motors M ₁ and M ₁ are directly connected to the pulleys of the feeders 5 a and 5 b without interposing a speed reducer or a clutch. Therefore, the periodical fluctuation of rotation due to the tooth contact of the gear of the speed reducer,
Since it does not affect the conveying speed (linear velocity) of 5b, the pipe body 1 can be always fed at a constant speed without giving the feed velocity fluctuation to the pipe body 1. In addition, the motor M for the feeder
_An inverter motor or the like may be used for ₁ and M ₁ .

First, the take-off device 7 will be described. The take-up device 7 sandwiches the corrugated pipe 2 whose surface is corrugated by the corrugating machine 6 from above and below and causes the corrugated pipe 2 to travel in the direction of arrow c. It has a pair of upper take-up machine 7a and lower take-up machine 7b, and is provided with take-up machine motors M ₃ and M ₃ for driving the respective machines. Further, in the power transmission drive system of each of the pulling machines 7a and 7b of the pulling device 7, the output shafts of the pulling machine motors M ₃ and M ₃ are directly coupled. That is, the pulleys of the take-off machines 7a and 7b do not have a reducer, a clutch or the like interposed therebetween, and the take-up machine motor M is used.
_3, the output shaft of M ₃ is connected directly. Therefore, the periodical fluctuation of rotation due to the tooth contact of the gears of the speed reducer or the like does not affect the transfer speed (linear speed) of the pullers 7a and 7b, so that the corrugated pipe 2 is not subjected to the fluctuation of the feed speed. The corrugated tube 2 can always be taken at a constant speed. An inverter motor or the like may be used as the take-up machine motors M ₃ and M ₃ .

With this take-up device 7, the corrugated pipe 2 has a predetermined tension (axial holding force) between the corrugating machine 6 and the take-up device 7.
As a result, stable corrugation molding is possible. That is, for example, as shown in FIG. 1, even if the winder 32 is stopped in order to replace (the drum of) the winder 32 on the downstream side of the take-up device 7, it is not necessary to suspend the corrugating work, and Since the corrugated tube 2 corrugated during that time has a predetermined shape, it does not affect the performance of the product. Further, the feeding device 5 and the take-up device 7 are
Any other device (roller type or the like) may be used as long as it is a device that travels the tubular body 1 and the corrugated pipe 2 from the upstream side to the downstream side in the axial direction (longitudinal direction) thereof.

Next, the corrugating machine 6 will be described. A corrugating forming portion (molding head) 8 for corrugating the tubular body 1 to form the corrugating tube 2, and corrugating work for operating the corrugating forming portion 8. And a drive motor M ₂ . The corrugated work drive motor M ₂ operates the corrugated forming unit 8 at a predetermined working speed to set a predetermined pitch,
The pipe 1 is corrugated with a predetermined diameter. To be more specific, for example, although not shown, on the circumference of the pipe body 1 fed at a predetermined speed by the feeding device 5,
A plurality of gears (corrugated dies) are rotated / contacted to corrugate on a concentric circle, and then the corrugated tube 2 is taken out by the take-up device 7 at a predetermined speed.

Further, in the power transmission drive system of the corrugated machine 6, the output shaft of the corrugated work drive motor M ₂ is directly coupled. That is, the corrugated die is directly connected to the output shaft of the corrugated work drive motor M ₂ without interposing a speed reducer or a clutch. Therefore, the periodical fluctuation of the rotation due to the tooth contact of the gear of the reduction gear or the like does not affect the corrugating work speed of the corrugating machine 6, so that the corrugating pipe 2 is always corrugated at a predetermined pitch. be able to.

An axial tensile force or an axial compressive force may act on the corrugated tube 2. This is a corrugated tube 2
This occurs when the traveling speed (feed speed) of the item fluctuates.
Specifically, if the corrugating work speed by the corrugating machine 6 and the take-up traveling speed v ₃ of the corrugating pipe 2 by the take-off device 7 are in a balanced state (balanced state), these axial forces do not act. When the take-up traveling speed v ₃ becomes faster, the corrugating work speed by the corrugating machine 6 is constant, so that the corrugating pipe 2 between the corrugating machine 6 and the take-off device 7 gradually has an axial tensile force. Will be received. On the contrary, when the take-up traveling speed v ₃ becomes slow, the corrugating work speed by the corrugating machine 6 is constant,
The corrugated pipe 2 between the corrugating machine 6 and the take-up device 7 gradually receives an axial compressive force. Then, this compressive force or tensile force acts as an axial thrust on the take-up device 7 and an axial forming resistance on the corrugating machine 6 (or corrugating forming portion 8), so that the corrugated corrugated pipe 2 is formed. Pulled or compressed, corrugated machine 6
The corrugated processing due to may not be performed at the set pitch, which may cause deformation. In addition to the above, the generation of the axial force may be due to a change in the working speed of the corrugating machine 6 or a combination thereof.

Therefore, according to the present invention, as shown in FIG. 3, the pulling device 7 detects the axial thrust force received by the pulling device 7 from the corrugated pipe 2 by the measuring device 4, and keeps the axial thrust force constant. The control means S for controlling the take-up linear velocity is provided. More specifically, the take-up device 7 is indicated by an arrow A.
It is slidable in the direction of arrow B. For example, the take-up device 7 is brought into a floating state in which it can be moved in the axial direction of the corrugated tube 2 by a linear movement guide means 27 such as a linear guide. The load cell 3 as the measuring device 4 for detecting the axial thrust received by the take-off device 7 is connected to the upstream side of the take-up device 7.
On the downstream side, a fixed part fixed to the take-up device 7 and the board 33.
It is connected (provided) between 28 and 28.

That is, the above-mentioned axial thrust acting on the take-up device 7 is detected by the measuring instrument 4 and gives a signal, and the control means S receives the signal, and the control means S receives the take-up machine motor M of the take-up device 7.
Change the take-up linear velocity (conveyance velocity) of ₃ (large or small). Specifically, for example, when a compressive force in the axial direction begins to act on the corrugated pipe 2 and a thrust force in the downstream direction (arrow A) acts on the take-up device 7, the measuring device 4 (load cell 3) on the downstream side compresses. In response to the action, the control means S controls to increase the take-up linear velocity of the take-up machine motor M ₃ . As a result, the axial compression force of the corrugated pipe 2 is rapidly reduced (disappeared), and the corrugated machine 6
Since the molding resistance that acts on (1) decreases (disappears), the axial thrust becomes constant, the corrugated corrugated pipe 2 maintains a constant corrugation pitch, and the corrugating machine 6 corrugates at a constant pitch.

The motor M for the take-up machine by the above control means S
The control of the take-up linear velocity of ₃ is feedback control and detects the state in real time to control the operation of the motor M ₃ . As a result, it is possible to produce a high-quality high-frequency cable with improved VSWR characteristics, in particular, without giving a periodical shape change to the corrugated tube 2.

Returning to FIG. 1, the corrugated pipe 2 exiting from the corrugating molding device section 9 has a cleaning device 29 and a drying device 30.
2 through the dancer 31 and is wound up by the winder 32 in the state of a semi-finished product in which the outer insulating layer 15 of FIG. . Then, the coaxial cable 10 may be manufactured by covering the outer insulating layer 15 with a device (not shown). Alternatively, this coating device may be incorporated on the upstream side of the winder 32 shown in FIG. In addition to this, as a high-frequency transmission cable corrugated and formed by the corrugation molding device unit 9 of the manufacturing apparatus of the present invention, there is a corrugated waveguide or the like although not shown.

[0025]

The present invention has the following effects due to the above configuration.

(According to the first aspect) Since the corrugated pipe 2 that has been corrugated is constantly taken by the take-up device 7 in a constant state, it is possible to efficiently produce a high-frequency corrugated cable having a uniform pitch in the axial direction. You can Therefore, it is possible to obtain a high quality product in which the VSWR characteristic of this high frequency cable is remarkably improved.

Since the take-up device 7 is set in the floating state (according to claim 2), the axial thrust acting on the corrugated pipe 2 can be directly detected by the load cell 3, so that the control means S can produce the product accurately. The corrugated tube 2 that can be controlled and is highly accurate can be manufactured.

(According to claim 3) Periodic fluctuations in rotation due to tooth contact of gears such as a speed reducer are carried out by the conveying speed (linear speed) of the feeding device 5 and the take-up device 7 and the work of the corrugator 6. Since it does not affect the speed, corrugation can be performed at a constant pitch without giving a periodical variation to the corrugation process.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a manufacturing apparatus of the present invention.

FIG. 2 is a perspective view of a high frequency cable manufactured by the manufacturing apparatus of the present invention.

FIG. 3 is a side view showing a main part of the manufacturing apparatus.

FIG. 4 is a side view showing a conventional manufacturing apparatus.

[Explanation of symbols] 1 tube 2 corrugated pipe 3 load cell 4 measuring instruments 5 sending device 6 corrugated machine 7 Collection device S control means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kaneharu Kan             Ishizuka Wari 6-1 San 37, Shirokata-cho, Fukui City, Fukui Prefecture             Ryoden Industry Co., Ltd. Fukui Factory (72) Inventor Itaro Kasabo             Mitsubishi Electric, 8 Nishino-cho, Higashi-Mukojima, Amagasaki City, Hyogo Prefecture             Line Industry Co., Ltd. F-term (reference) 5G323 EA02

Claims (3)

[Claims] 1. A corrugating machine for corrugating a pipe body, and a take-off device for taking down the corrugated pipe sent from the corrugating machine at a downstream side are provided. A high-frequency cable manufacturing apparatus comprising a control means for detecting the axial thrust received from the corrugated pipe by a measuring instrument and controlling the take-up linear velocity of the take-out device so as to make the axial thrust constant. 2. The high-frequency cable manufacturing apparatus according to claim 1, wherein the take-up device is in a floating state, and the measuring device for detecting the axial thrust received by the take-up device from the corrugated pipe is a load cell. 3. A feeding device for feeding the pipe body to the corrugating machine is arranged on the upstream side of the corrugating machine, and the power transmission drive systems of the feeding device, the corrugating machine and the take-up device are respectively provided. The high frequency cable manufacturing apparatus according to claim 1 or 2, wherein the high frequency cable is directly connected to an output shaft of a driving motor.