FI63640C - FOERBAETTRINGAR FOER FOERFARANDET AV OEVERDRAGNING AV VAJRAR - Google Patents

Description

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Patent »och regieterstyreleen '' AmMcm uttofd oek uti ^ krtfun pubUnrad 31.03.03 (32) (33) (31) Pyydetty utuoikuM * —prtarttut 10.03.73 Englant i-England (GB) 11672/73 (71) General Engineering Radcliffe 1979 Limited, Bury Road, Radcliffe,

Manchester M26 9UR, England-England (GB) (72) Bernard Keith Bigland, Radcliffe, Manchester, England-England (GB) (7U) Leitzinger Oy (5U) Improvements to the wire coating method - Förhättringar för förfarandet av överdragning av vajrar a method of making coatings on elongate elements such as wires, cables and wires, e.g., insulating coatings on electrical wires. For the sake of simplicity, these elongate elements are hereinafter collectively referred to as "wire". More specifically, the coating material is a thermoplastic or elastomeric material, and again for simplicity, these materials are commonly referred to as coating materials.

It is known to make coated wires, such as electrical wires, with an insulating coating, using a device consisting essentially of a helical press through which the coating material is fed to an extruder surrounding the wire to be coated so that the coating can be windings. Such a device has the disadvantage that unless the machine is controlled by skilled workers, expensive and complex monitoring equipment is required for automatic monitoring of the machine. There are many variables that must be observed to obtain a 63640 image acceptable product. For example, during use, the speed of the press and / or the speed of the winding device may vary, as well as the flatness of the coating material and the temperature of the coating material or press, or all of these variables must be taken into account. With respect to variations in the operating speed of the press and the winding device, this can be arranged by connecting the press to the winding device so that a change in the speed of one element causes a similar change in speed in another. The coupling used may be physically provided, e.g., by mechanical couplings or by the use of synchronized motors to drive the press and winder, but this does not necessarily guarantee that a uniform coating is achieved due to possible changes in the coating composition or temperature. Variations in the coating composition and temperature can, of course, affect the uniformity of the coating, whether or not the speeds of the press and the winder are synchronized.

In order to achieve coating smoothness, it has been proposed to vary the speed of the winding device to affect the speed of the press screw, as it is easier to vary the winding speed and thus control the smoothness than to try to control the smoothness by varying the speed of the press screw.

From the above, it is clear that the monitoring device must be adapted to all mechanical elements of the equipment and that due to e.g. non-linearity of the output with respect to the speed of the press, the synchronization step is performed when the equipment is currently producing coated wire. This inevitably results in batches of unevenly coated wire that cannot be used. In addition, for example, periodicity in the method may occur during use, due to short-term changes in the power supply or coating composition, which in time causes waste, as the control mechanism requires time to compensate for such changes. In the past, the development of equipment has followed the line that in order to achieve a higher level of uniformity, more and more advanced control devices have had to be used in the output.

The above means the production of a single coated layer of il 363640 wire, which coating material is pressed onto the wire from a single press. Given that it is common practice to apply two or more coating materials to a wire in a single operation that requires the use of two or more presses, it is clear that the problems described above are becoming more and more severe.

One of the first uses of coated wires is in the formation of cables comprising two or more wires. It can be seen from the above comments that if two or more wires are coated simultaneously to provide a finished cable, the problem of providing a uniform coating on each wire becomes significantly greater. Therefore, it is normal practice to make separate wires from which the cable is then assembled. Usually the cables are made at a much lower speed than is possible to make a simple coated wire, e.g. the ratio of coated wire to cable production speeds can be up to 10: 1 and therefore storage of simple wires is often necessary due to unproductive use of valuable and expensive space .

The invention is based on the finding that it is possible to provide a device in which the basic unevenness of the output from the press is compensated before the coating material is applied to the wire. This realization of the problem has made it possible to provide a device in which it is possible in many cases to simplify the monitoring device and, as a result, to pre-synchronize the device parts so that as soon as the working speed is reached, the wire coating has the required proportions. reducing waste. Thus, if necessary, the device according to the invention can be used economically to feed coated wires directly to a twisting, bundling or layering device or coating device, thus eliminating or at least significantly reducing the need to store private coated wires until needed for cable production.

Thus, in one aspect of the present invention, a device for coating a wire comprises a coating composition dispensing member, a feed device therefor, at least one positive transport unit connected to the at least one wire by a coating extruder having an opening for pressing the coating mixture around the wire to be coated and the winding wire.

According to another embodiment of the invention, there are devices for pre-synchronizing the positive transport units and the winding member.

Preferably, the apparatus comprises means between the wire coating extruder and the winding device adapted to cool, vulcanize or cure the mixture fitted to the wire in the coating mold.

Most preferably, the device has a plurality of positives from the transport unit for the coating composition that interact with the individual non-positive coating composition dispensing members, the device having a wire coating extruder in communication with each positive transport unit and the coated wire winder. Most preferably, the positive transport units are pre-synchronized with each other.

According to a further development of the invention, the positive transport units can also be pre-synchronized with the winding device.

In one embodiment of the device, the speed of the dispensing members can be monitored to maintain a predetermined pressure at the inlet of the positive transport unit.

Alternatively, the distribution members and the positive transport unit are pre-synchronized.

In one form of the device, there are a plurality of positives from the transport unit, each having a wire coating extruder, and a winding and cabling device for the coated wires, whereby two or more wires can be formed into cables.

Most preferably, the winding device comprises devices for winding, bundling, layering or swinging, whereby the cable can be formed from coated wires while insulating them.

According to another embodiment of the invention, the sheathing extruder is arranged to form a shield around the cable.

The positive transport unit is preferably a gear pump.

Alternatively, the positive transport unit is an alternating positive transfer multi-screw pump.

Preferably, the dispensing member is a vise. In one embodiment of the invention, the positive transport units and distribution members are pre-synchronized.

In an alternative embodiment of the invention, the positive transport units and dispensing means are available at different speeds to maintain a predetermined pressure at the inlet of the positive transport units.

The invention will now be described, by way of example, with reference to two practical embodiments thereof, shown in the accompanying drawings, in which Figure 1 is a diagram schematically showing an apparatus for making a single coated wire.

Fig. 2 is a diagram similar to Fig. 1 showing a variant.

Fig. 3 is a diagram similar to Fig. 1 showing still another embodiment.

Fig. 4 is a diagram of a part of the device according to Fig. 1, showing a variant.

Fig. 5 is a diagram schematically illustrating an apparatus for making a pair of coated wires and making a twisted pair cable therefrom.

63640

Fig. 6 is a diagram similar to Fig. 2 showing a variant, and Figs. 7 and 8 are diagrams of the device of Fig. 5 showing still other variations.

Figure 1 shows a dispensing member 10 from which a coating composition is fed via a pipe 11 to a positive conveying unit 12 to which an extruder 13 is attached, to which a coating composition is fed in a predetermined feed rate per unit time through an opening through which the wire 14 passes centrally. The wire is fed to the extruder head from the feeder 15. The wire thus becomes coated with the coating mixture as it passes through the opening of the extruder. The coated wire passes from the extruder 13 through a cooling, vulcanization or curing zone S, where the coating mixture is cooled, vulcanized or cured before it enters the winding device 16 and is fed to the reel 17 or the drum.

In the device generally described above, assuming that the coating composition is of a thermoplastic material such as polyamide, polyolefin or vinyl material, the dispensing member 10 may be in the form of a simple screw press in which plastic material granules are moved to provide a homogeneous mass; the positive transport unit 12 may be a gear pump. The curing zone S in this device may have jets of water or coolant which provide a conical water or coolant curtain around the wire, the water or coolant being sprayed onto the wire so that its essential velocity component is in the same direction as the coated wire; and the winding device 16 may be a tension reel to which the wire is wound; that is, the elements 16 and 17 shown in the diagram may be combined.

Although such a device does not allow the coating of more than one wire, it allows a very precise fitting of the coating because, despite inevitable changes in the coating composition and other factors such as ambient temperature, device operating voltage and the like, which may cause changes in is greater than the pump capacity.

7 63640 The amount of coating material fed to the extruder, and thus the amount fed to the wire in a unit of time, varies within such small limits that in practice it can in many cases be considered to fall within the normal framework.

It is possible to further develop the device to achieve acceptable uniformity of coating dimensions despite changes in the operating speed of the device, and to achieve this it is necessary to pre-synchronize at least the winder and the positive transport unit so that if the winding speed varies, the transport unit speed varies accordingly. Figure 2 schematically shows one possible device to which pre-synchronization can be applied. As will be seen, the common drive D is provided for the positive transport unit 12, and the winding device 16, the shafts D1 and D11 are driven from the drive D, and these together with the shafts 121 and 161 and the bevel gear G function to shift the drive. As discussed below, other uses may be used if desired.

In the further developed form shown in Figure 3 and for fitting two or more coating materials to a single wire, it is possible to feed coating materials through separate conveying units 12 and 12a to fit coatings to the wire in any known form, i.e. either sequentially fitted coatings extends over one part of the wire. Again, it is possible to pre-synchronize the positive transport units with the winding device and / or with each other.

In another further developed embodiment, as shown in Fig. 4, a pressure equalizing device P operating to vary the output of the dispensing member 10 may be arranged at either the outlet end of the dispensing member 10, as shown in solid line at the inlet of the positive conveying unit 12; as shown by the dashed line at P1 or between the two points by the pipe 11, as shown by the dashed line at PII so that the pressure at the inlet of the positive transport unit 12 is kept constant. Alternatively, the dispensing member and the positive transport unit may be pre-synchronized, e.g., using mechanical means such as those used to pre-synchronize the positive 8 63640 transport unit 12 and the winding device 16, as shown in Figure 2.

The device shown in Figure 5 has a dispensing member 20 (e.g., one screw conveyor, as referred to above) that feeds a suction tube 22 through a tube 21 from which the tubes 23 feed a pair of positive transport units 24 (such as a positive gear pump). Each member is provided with an extruder head 25 into which the wire 26 to be coated is led from a feeder and from which the coated wire passes through an area S where the coating is cooled, vulcanized or cured. The wires have hitherto been pulled through the device by means of a winding device 28, from where they pass to a rotating end 29, from which a double cable 30 leaves, which can then be wound on a spool 31 or fitted into a container. Although the two winding devices 28 are illustrated connected to the rotating head 29, it should be noted that this is for simplicity only; in practice, any known winding and winding device can be applied.

The device according to Fig. 5 can be modified, e.g. as shown in Fig. 6, by arranging more than two tubes 23 in the suction tube 22. As shown in Fig. 6, there are four such positive transport units, two of which are numbered 24 and two additional equipment. The additional pipes 23a are arranged from the suction pipe 22 as well as the additional cooling devices S1, the winding devices 28a, the winding end 29a and the cable reel 31a, together with an additional wire feed device 27a. Using this arrangement, two double cables can be made.

By increasing the number of positive transport unit pairs, as well as winders and rotators, a larger number of double cables can be made. As can be seen from Figure 7, a cable with four wires can be made using only a single twist end 29b into which the coated wires from the winding devices 28 and 28a are fed. By increasing the number of wires fed to the rotating head 29b, other cable shapes can be made. If desired, a triple cable can be made and in fact a cable bundle comprising a very large number of wires can be made. In another further development shown in Figure 8, 63640, each positive conveying unit 24, 24a may be fed from its own dispensing member 20. This arrangement makes it possible to coat each wire with a different coating mixture. The device according to Fig. 8 can be used with either the rotation device according to Fig. 6 or Fig. 7 if desired.

As in the arrangement according to Fig. 3, it is possible to make improvements to the device according to Figs. 5-8 by pre-synchronizing the positive transport units 24, 24a with each other and further with the winding devices 28, 28a.

It should be borne in mind that although wires have been referred to as plastic materials, they can also be coated with other materials, such as natural or synthetic rubber.

Standard conveying means other than positive gear pumps can be used, e.g. an alternating multi-screw pump, and of course the type of device used in the cooling, vulcanization or curing zone S depends on the type of material used.

In order to achieve the pre-synchronization described above, it is possible to arrange a direct mechanical drive connection between the pre-synchronized devices, in which case the device can be operated with one variable speed drive, or alternatively synchronous motors or positive hydraulic motors can be used to drive the members individually.

Although the devices of Figures 5-8 are generally used at coating speeds that are significantly lower than those used to coat a single wire because the coating speed must match the spin or bundle speed, space savings due to the need to store coils or coils of coated the wire and a better uniformity of the thickness of the coating are sufficient to compensate for the reduction in speed which may be necessary.

Claims (24)

Device for coating cables with a distribution device for a coating material, characterized in that it consists of a feeder device (21, 22, 23) conductive to a plurality of positive transport units (24), which communicates with at least one coating material. wire extruder (25), with an outlet for extrusion of the coating mixture around the wire (26) to be coated, and a winding device (28) for the coated wire. Device according to claim 1, characterized in that it has means (D) for pre-synchronizing the positive transport units with the winding device (28). Device according to claim 1, characterized in that it has a non-positive coating mixer (20) and a wire extrusion extruder (25) for each positive transport unit (24). Device according to any of the preceding claims, characterized in that the positive transport units (24) can also be pre-synchronized between themselves. Device according to any of the preceding claims, characterized in that the positive transport units (24) can also be pre-synchronized with the winding device (28). 6. Apparatus according to claims 1 or 2, characterized in that a positive extruder extruder (25) for the wires and a wiring device (29) for coated wires are connected to each positive transport unit (24), whereby two or more wires can be formed into cables. Device according to any of the preceding claims, characterized in that the winding device (28) comprises a twisting device (29), where a cable can be formed by the coated wires, when insulated. Device according to any one of claims 1-6, characterized in that the winding device (28) comprises bundling means, whereby the cable can be formed by coated wires when insulated. Device according to any of claims 1-6, characterized in that the winding device (28) comprises coating arrangements whereby a coated cable can be formed by coated wires when insulated. 10. Device according to any one of claims 1-6, characterized in that the winding device (28) comprises a pendulum device, whereby a cable can be formed of coated wires when insulated. 11. Apparatus according to any of the preceding claims, characterized in that it comprises a coating extruder, whereby a cable can be coated with foil after manufacture. 12. Device according to any of the preceding claims, characterized in that the speed of the distributing means (20) can be regulated to maintain a predetermined pressure at the inlet end of the positive transport units (24). Device according to claim 12, characterized in that it comprises a pressure-reacting device (D) in the outlet end of the distributor (20) for controlling the amount of discharge. Device according to claim 12, characterized in that a pressure-reacting device (D ') is provided at the inlet end of the positive transport unit (24) for varying the output quantity of the distributor (20). t Device according to claim 12, characterized in that a pressure-reacting device (D ") is arranged between the distributor (20) and the positive transport unit (24) for varying the output quantity of the distributor (20). Device according to any one of the preceding claims 1-11, characterized in that the distributing means (20) and the