DE2416277C3 - Device for the continuous production of long water-tight high-frequency coaxial cables - Google Patents

Description

The invention relates to a device: for the continuous production of longitudinally watertight high-frequency coaxial cables, consisting of a press for continuously applying the spacer disks to the inner conductor, a device for applying insulation arranged over the disks, a device for bending the metal outer conductor strip to form a pipe, a welding device for welding the longitudinal seam of the outer conductor, a drawing funnel to reduce the cross-section of the outer conductor, a caterpillar haul-off and a take-up reel.
In a device of this type known from DT-OS 2120 699, the insulation is applied to the spacer disks attached to the inner conductor with the aid of an extrusion device that produces a smooth plastic tube surrounding the spacer disks; around this plastic pipe, the outer conductor metal strip is bent into a pipe by forming rollers, the longitudinal seam of which is welded. Then the cable is pulled through the drawing funnel, creating the outer diameter

»Ο the outer conductor is reduced and that the insulation forming smooth plastic tube firmly against the perimeter the spacer washers is pressed. To achieve longitudinal watertightness, the cable is finally heated, so that the plastic pipe is welded to the spacer washers.

Such a device is because of the extrusion press required for the formation of the plastic pipe and the final heating and also because of the use of rotating molds expensive and complicated. In addition, the dimensions of the spacer disks must have relatively tight tolerances to ensure a perfect and tight connection with the smooth plastic pipe around the entire circumference is guaranteed for each spacer washer

In the earlier patent application P 24 04 909.0 is a Coaxial cable proposed in which the insulation is formed by a transversely corrugated dielectric tape, that is, the inner conductor with the washers overlapping wrapped. This training eliminates the need to maintain a tight tolerance for the spacer washers, because differences in diameter are compensated for by the corrugations of the belt will. Furthermore, with the final cross-cut reduction, a flawless longitudinally watertight connection between the transversely corrugated tape and the perimeter of the Spacer washers achieved.

The object of the invention is to create a device of the type specified at the outset which, with a simple structure, ensures the production of perfectly longitudinally watertight high-frequency coaxial cables.
According to the invention, this object is achieved in that behind the disk press a pair of rollers is arranged for transversely corrugating a smooth dielectric strip, that the device for applying the insulation arranged over the disks has two tubular guide parts coaxially surrounding one another forming an annular gap that the with the spacer provided Innenlei ter enters the inner tubular guide part, since the transversely corrugated band emerging from the pair of rollers is inserted into the space in such a way that it is shaped into a tube, and that the device for bending the outer conductor metal band has a guide ring into which the inner conductor sheathed with the tubular, bent, transversely corrugated band

³ 4

as well as a connecting to the guide ring · Inner conductor applied. A very schematically

of the cylindrical mold which is made from the extrusion molding machine 21 has a nozzle on one

Guide ring exiting sheathed inner conductor point where two chains, each half of the

surrounds with the formation of a space in which the spacer disks form compression molds, one another

Outer conductor metal tape is introduced, and on its 5 of the opposite. The output motor 26 controls the

The outlet end of the welding device is arranged. Advance of the two carrying the half-press molds

In the device according to the invention for chains via a schematically shown arrangement

Formation of the tubular insulation and the outer cable from a chain 22 and a drive wheel 23.

ters exclusively fixed guide parts and a device 27 is used for automatic

Forming tools of simple construction used. In addition, monitoring of the distance and the shape of the

this eliminates the need for an extruder and spacer washers.

the complicated and required for their operation and The speed of the drive motor 26 is by a

precise control device. The cross-waving is controlled by a control circuit 28. This control circuit

smooth dieelectric tape, which then receives a signal from a

fixed tubular guide parts are simply supplied around the tachometer generator 54, which is connected to the motor 56

Spacer washers is placed, allows the formation of the haul-off device in the station 7 is coupled, and

the tubular insulation in a simple manner and with, on the other hand, a signal from a photoelectric

simple means, being delivered as a result of the action of the device 29 for monitoring

Transverse corrugation nevertheless a flawless longitudinal water- a supply loop of the with the spacer washers

tightness is guaranteed without a final 20 provided inner conductor being provided. One with that

Warming is necessary. The principle of the formation of the motor 26 connected to the tachometer generator 26 'represents the

a tubular jacket through the fixed synchronism of the motors 56 and 26,

and forming tools is also used for the formation of the tools shown in FIG. 2 device shown in more detail

of the outer conductor maintained, creating a uniform station 3 is used for transverse waves of the dielectric

rather, results in a compact and simple structure. 25 tape that is used to form the on the spacer washers

Advantageous refinements and developments to be applied insulation is used. In this

the device according to claim 1 are in the station there is a supply spool 31 with smooth

Subclaims indicated. Plastic tape, the width of which is slightly larger than

One embodiment of the invention is in the front of the inner circumference of the outer conductor

Drawing shown. They show: 30 cross-section reduction taking place. The smooth one

Fig. 1 is a plastic belt in two halves for reasons of space between two corrugated rollers 32 and

subdivided overall view of the device, 32 'passed through, which by means of electrical Heizwick-

Fig. 2 is a more detailed representation of the device lungs 33 are heated. The one from the pair of rollers 32,

for the transverse corrugation of the tape, 32 'emerging dielectric tape is thereby with

3 shows a more detailed representation of the means 35 provided with permanent transverse corrugations. The cross-corrugated

to form the insulation and the outer conductor. Tape is guided over a pulley 34, which is on

Fig. 1 shows very schematically the structure at the end of a balance arm 35 is attached, which is a

continuous production of longitudinally watertight speed control potentiometer 36 via a gear wheel

Coaxial cables. For reasons of space, the representation in drives 35 ', 36' is activated. The potentiometer 36 controls the

divided into two halves, which along the dot-dash 40 drive motor 37 of the pair of rollers 32, 32 'via a

th line XY are to be joined. The device control circuit 38. The motor 37 is operated in this way

is indicated by dashed lines in different stations through the supply loop 39 running over the roller 34

divided. Station 1 is used to calibrate the controlled. This loop 39 is determined by the speed of the

Inner conductor serving wire, the station 2 to the roller pair 32,32 'and through the take-off speed

Applying the spacer washers to the inner conductor, 45 speed of the pull-off device 51 set. The one in the

the station 3 for transversely corrugating the dielectric tape, station 3 existing facility is thus in

the station 4 for the formation of the tubular insulation depending on the withdrawal speed without

from the transversely corrugated strip, the bending station 5 automatically regulates electrical circuit connection,

of the outer conductor metal strip to a pipe and to the die provided in stations 4, 5 and 6 (Fig. 1),

Welding the longitudinal seam of the pipe, the station fi to 50 devices are used to form the insulation

Cooling and drying of the cable and the station 7 for the transversely corrugated tape to form the outer conductor

the withdrawal and winding of the finished cable. from a smooth one supplied from a supply reel 42

In the station 1 is a supply reel 11 metal tape for welding the longitudinal seam of the

supplied wire through a calibration drawing iron 12 outer conductor as well as for cooling and drying the

drawn, the outer conductor welded in the usual way with a lubricator. These facilities are in

device 13 upstream and a cleaning device Fig.3 shown on a larger scale and are

14 is connected downstream. The pulling drum 15 of the subsequently explained in detail.

Calibration station 1 is driven by the motor 26 of the station In the last station 7 there is the caterpillar

2 driven by a mechanical transmission 16, train 51, which the cable or its production

which pulls the motor 26 with a continuously adjustable 60 parts used throughout the device.

mechanical gear 17 is coupled, which is connected by a feed hopper 47 in front of the caterpillar haul-off 51

Servomotor 18 is controlled. The servomotor 18 receives arranged in which a cross-sectional reduction of the

a speed control signal takes place from a photoelectric finished outer conductor. The finished cable is on

Monitoring device 19, which is wound between the one winding spool 52.

Calibration station 1 and station 2 formed 65 Fi ς. 3 shows the components on a larger scale

Monitoring the supply loop of the inner conductor. of stations 4, 5 and 6 partly in longitudinal section in

In station 2, spacer plates are continuously produced on a plane containing the longitudinal axis of the cable,

ben made of plastic at regular intervals on the In the upper part of Fi g. 3 are cross-sections through the

Guides and forming tools in a direction perpendicular to the metal band C bends into a tube that bends the inner conductor

Shown longitudinal axis standing planes. with the insulation attached to it. One

The inner conductor, provided with the spacer disks, is arranged directly behind the molding tool 43, A enters a tubular guide part 41, which is widened in a funnel-shaped manner on the welding front indicated schematically by an arrow, so that direction 44 is used to weld the longitudinal seam of the spacer disks correctly into the Inside of the metal tube forming the outer conductor.
Guide part 41 are guided. A second tubular- At the outlet end of the guide ring 64 a total guide part 61 surrounds the right end of the guide plate 65 is attached, which has the shape of a guide part 41; it is on this by spacers it has a cylinder fixed along a plane inclined with respect to its axis 62, 62 'cut off between the guide part 41 and to. The guide part 61, which folds one on top of the other, has an annular gap between the cross-sections of the guide plate 65 are defined in the, the radial dimension of which is shown approximately between the sections IV, V and VI. This guiding the thickness of the sheet, measured at the apex of a transverse corrugation, protrudes through the entire molding tool 43 and until it corresponds to the transversely corrugated strip B. In this intermediate over the welding device 44. The transversely corrugated band B is inserted, which can be seen from 15 that the guide plate 65 is formed into a tube in the vicinity of the guide parts 41 and 61. Welding device 44 is in the form of an arched, which the spacer washers on the inner conductor Λ in tongue which surrounds itself over an angle of about 30 ° in an almost closed circle; it is merely extended and the overlap zone of the two edges between the two edges of the band covers a small part of the transversely corrugated band B , so that there is this gap which corresponds to the position of the spacers 62, 10 band before any direct contact with the 62 ' . This arrangement can be seen in section 1. Outer conductor forming metal band C and in particular

The tubular guide part 61 is joined by its edges during the longitudinal welding

slightly tapered guide approach 63, which protects.

Cross-sectional shape is shown in the section 11 and at a distance of less than 5 cm behind the.

which, in the manner of a hemmer, measures the diameter of the 25 welding point, a cooling device 45 is arranged.

Band ßformed tube so reduced that the net, which consists essentially of a cylindrical

overlap both edges of tape B. This creates a container that is connected via pipes 70 and 71

achieved that the inner conductor A is connected to a cooling water circuit. The end

attached spacer washers completely from the exiting this container cooled cable is with

dielectric tape ß is surrounded, the two edges 30 of which dried immediately with the aid of a compressed air device. It

overlap without being firmly connected to each other, it is important that the welded outer conductor before the

being. Introduce into the funnel 47 of each trace of

At a short distance behind the outlet end of the moisture is freed, so that an effective lubrication

Guide ring 63 is a guide ring 64 which can be arranged in the judge. The drying is successful

net, the cross-sectional shape of which is shown in section 111. 35 through a coiled tube 46, which is attached to the cable ¹

The directional openings provided with the transversely corrugated insulation are provided and the above

The inner guide runs through this guide ring. Behind the pipes 72 and 73 with a compressed air source c

Guide ring 64 lies the molding tool 43, which is connected.
the smooth one coming from the supply tube 42

For this purpose 3 sheets of drawings

Claims (5)

Patent claims: 1. Device for the continuous production of longitudinally watertight high-frequency coaxial cables, consisting of a press for continuously applying the spacer discs to the inner conductor, a device for applying insulation arranged over the discs, a device for bending the outer conductor metal strip to the pipe, a welding device for welding the longitudinal seam of the Outer conductor, a drawing funnel to reduce the cross-section of the outer conductor, a caterpillar take-off and a winding spool, characterized in that a pair of rollers (32, 32 ') for transversely corrugating a smooth dielectric strip (31) is arranged behind the disk press (21) the insulation arranged over the disks has two tubular guide parts (41, 61) surrounding each other coaxially to form an annular gap, so that the inner conductor (A) provided with the spacer disks enters the inner tubular guide part (41) that the transversely corrugated strip (B ) emerging from the pair of rollers (32, 32 ') is inserted into the space in such a way that it is shaped into a tube, and that the device for bending the outer conductor metal strip (C) has a guide ring (64) , into which the inner conductor (A ) encased with the tubularly bent transversely corrugated band (Ό) enters, as well as a cylindrical forming tool (43) adjoining the guide ring (64), which encases the encased inner conductor emerging from the guide ring (64) to form a Surrounds intermediate space into which the outer conductor metal strip (C) is inserted, and at the exit end of which the welding device (45) is arranged. 2. Apparatus according to claim 1, characterized in that the inner tubular guide part (41) is widened in a funnel shape on the inlet side. 3. Apparatus according to claim 1 or 2, characterized in that the outer tubular guide part (61) is extended at the outlet end by a slightly tapered guide projection (63) which has the shape of a hemmer cut open along a surface line and bent into a spiral cross-section , which brings the edge sections of the pipe bent from the transversely corrugated strip (B) to overlap. 4. Device according to one of claims 1 to 3, characterized in that the inner guide part (41) and the outer guide part (61) are firmly connected to one another by spacers (62,62 ') are. 5. Device according to one of the preceding claims, characterized in that on the On the exit side of the guide ring (64) a tongue-shaped guide plate (65) is arranged, which extends through the molding tool (43) to below the welding point of the welding device (44).