DE2925931A1 - METHOD AND DEVICE FOR PRODUCING A POWDER-FILLED CABLE - Google Patents

Description

The invention relates to the filling of cables with fluidized Powder, it concerns a device suitable for this and a cable filled by such a method.

It is known to fill cables with powder, the Powder is supplied to the cable in "open" form, i.e. the individual conductors of the cable are kept at a distance from each other so that the powder can be introduced therebetween by blowing it or registered in another way.

Various problems arise with the known types of cable filling, one of which is uniformity to achieve and maintain the filling. For example, with multilayer cables it is important that the filling is uniform everywhere as a change between the cable layers is a change in the electrical Properties of the layers results. For long distance cables, this is a very undesirable condition and in some applications even an unacceptable state.

The present invention creates a filling of a cable consisting of many individual conductors by the cable is passed through a fluidized bed of the filling powder, the cable in a substantially closed State is before it enters the fluidized bed.

To clarify the invention, the process and the device used for this purpose are shown below with reference to the schematic Drawing described; in the drawing shows:

Figure 1 is a side view of a cable loading device according to the invention,

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FIG. 2 shows a schematic representation of the process of passing a cable through the device according to Fig. 1, and

FIG. 3 shows a perspective illustration of an embodiment of the device according to the invention for filling two cables.

The apparatus of Figure 1 comprises a main vessel or Housing 10 with a cover section 11, an air vessel 12 at the bottom of the housing 10, an air inlet 13, a dust extraction outlet Ii). and a powder inlet I5. At the inlet end of the housing 10 is an inlet form 16 and is located at the opposite end of the housing 10 an outlet shape 17. The air vessel 12 is opposite separated from the main body 10 by a porous plate 18.

In operation, powder is introduced into the housing 10 through the inlet 15 filled and compressed air is the air vessel 12 over the air inlet 13 is supplied. The air passes through the porous plate 18 and fluidizes the powder in the housing 10, so that a fluidized powder bed I9 is created. A certain amount of dust that is generated is discharged through the dust extractor 1if.

Before the housing 10 is filled with powder, the conductors 20 of a cable are passed through the inlet and outlet forms or mouthpieces 16 and I7 passed through. As shown in Fig. 1, the conductors 20 of the cable are passed through a preforming guide plate 21 and then passing through of the inlet mouthpiece 16 the cable is formed.

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An initial portion of the conductors formed into a cable passes through the housing 10 and becomes the outlet mouthpiece 17 brought out. The ones formed into a cable Conductors can then be connected to a guide element for connection to a pulling and receiving mechanism will.

When the conductors have passed through the housing, it can be closed, powder can be fed in and the air supply can be switched on. The conductors are then pulled through the housing. When the conductors emerge from the housing 10 through the outlet mouthpiece 17, a wrapping tape 25 is wrapped around them by a shaping device 26. In the example shown, the forming device comprises a conical inlet section 2.7 and a tubular section 28 of constant diameter. The tapered portion wraps or wraps the wrapping tape 25 around the conductors 20 and prevents the filler from being lost.

The conductors 20 can be separate individual conductors or as is common with trunk cables, contain pairs of conductors twisted together. The ladder are fed into the housing through the inlet mouthpiece or inlet mold 16 in a substantially closed condition introduced. There may be a small gap between the conductors, e.g. due to the ladder opening slightly after entry from the inlet mold 16 into the housing, however, the resulting opening is only slightly. The distance can be changed by changing the hole diameter the inlet shape 16 can be changed to change the filling level, surprisingly a uniform and complete filling for cables with also very large ones

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Number of conductors reached although the conductors are and possibly in an essentially closed state different conductor layers are present. For example, the filling of a cable can be satisfactory can be achieved with 50 conductor pairs. The way of the ladder through the housing 10 is shown in FIG.

Fig. 3 shows a typical embodiment of a device for filling two cable cores that are in the special Example each contain 25 pairs of conductors. Two housings 10 are arranged next to one another and connected to a common powder feed / fO. In this example are torsional vibration front panels 4I on the inlet forms or Mouthpieces provided in order to put the ladder in a state of oscillation when it passes through the housing 10. The powder supply is controlled so that an essentially constant bed strength or thickness results. In an alternative arrangement (not shown), a plurality of cable cores can also be connected by a common Bed to be headed.

The device is relatively simple, inexpensive to build and very effective. The result is uniformly filled Cable cores and the filling can be controlled and changed as desired. The resulting cable has uniform Electrical Properties.

In this way, the conductors of a cable are filled with powder by passing the cable through a fluidized powder bed in an essentially closed state. After exiting the fluidized bed, the filled cable can be provided with a wrapping tape.

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Claims (1)

Patent claims: 1. \ Process for filling a system consisting of many individual conductors ^ - 'the cable core with powder, characterized that the cable core (20) through a fluidized bed (19) of the filling tester is performed, and that the cable core (20) before entering the fluidized bed (19) in substantially is held closed. 2. The method according to claim 1, characterized in that that the core (20) is wrapped with a tape (25) when it emerges from the fluidized bed (19). 3. The method according to claim 1 or 2, characterized in that the powder the bed with such Amount is supplied that a substantially constant bed strength is maintained. 909982/0929 if. Method according to one of Claims 1 to 3, characterized gekennzei chnet that the conductors of the cable core (20) when passing through the bed housing (10) be set in vibration. 5. Device for filling one consisting of many conductors Cable with powder, with a housing with a housing base and an inlet and an outlet end, characterized in that at least one inlet (16) at the inlet end of the housing (10) for Entry of a cable core (20) from a plurality of individual conductors (20) is provided that the inlet (16) has such a size that the core (20) is held in a substantially closed state that a Outlet (17) at the outlet end of the housing (10) for discharge the cable core (20) is provided in the closed state and that a porous element (18) at the bottom of the housing (10) and a device (13) for supplying air through the porous element (18) is provided, in order to fluidize powder contained in the housing (10) and to surround the cable core (20) with fluidized powder. 6. Apparatus according to claim 5, characterized net that at the bottom of the housing (10) an air vessel (12) is attached that the air supply device is an air supply device (13) to the air vessel (12) and that the porous element (18) is between the air vessel (12) and the housing (10). 7. Apparatus according to claim 3 or 6, characterized in that the housing (10) is provided with a cover portion (11) on which a dust extractor (14) is attached. 903382/0929 8. Device according to one of claims 5 to 7, characterized in that a winding device (26, 2.7, 28) adjacent to the outlet (17) for wrapping a tape (25) around the core (20) when exiting through the outlet (17 ) is provided. 9. Device according to one of claims 5 to 7 »characterized in that in front of the inlet (16)
a preform element (21) is arranged to preform the conductors (21) prior to the inlet. 10. Device according to one of claims 5 to 9, characterized in that an oscillating element (if1) at the inlet (16) for oscillating the conductor (20)
is provided when they pass through the housing (10). 909882/0929