GB2112429A

GB2112429A - Wire guide flyer for the rotor of a tubeless stranding machine

Info

Publication number: GB2112429A
Application number: GB08225389A
Authority: GB
Inventors: Renate Baum; Dimiter Mandadjiev; Martin Poide
Original assignee: Schwermaschinenbau Kombinat Ernst Thalmann VEB
Current assignee: Schwermaschinenbau Kombinat Ernst Thalmann VEB
Priority date: 1981-12-30
Filing date: 1982-09-07
Publication date: 1983-07-20
Also published as: DD209003A1; DE3230172A1; IT8223118A0; FR2519040A1; GB2112429B; IT1152527B

Abstract

The flyer (8) extends between bearing stands (1, 2) to guide the material (13) being stranded, said flyer (8) comprising two high strength bands (9 and 10) arranged at an equal spacing from one another and fixed to the rotor sections (3, 4); guide rollers (12) mounted in lateral fixing members (14) are arranged between the two bands (9, 10), and spacers (15) are arranged at right angles thereto, to hold the two bands (9, 10) together at the desired spacing. <IMAGE>

Description

SPECIFICATION Wire guide flyer for the rotor of a tubeless stranding machine This invention relates to a wire guide flyer for the rotor of a tubeless stranding machine of the type wherein the individual rotor sections are interconnected by flyers serving to guide the material being stranded, and to a tubeless stranding machine provided with a wire guide flyer.

Stranding machines of the flyer type are known in various forms.

One known construction is shown in British patent number 1175 589. In the stranding machine illustrated therein the flyers are guided into the individual rotor sections, where they are joined together. Each flyer is formed by a guiding strip curved to match the slight curve of the wires.

The wires are guided over the inside of the flyers by guide nipples. At the non-uniform phases of operation, i.e. at the starting up and decelerating phase, the wires are pulled over the wire guides invoived and in the process are constantly reorientated along the whole rotor. This creates strong frictional forces, leading to an enormous increase in the tensile forces in the material being stranded. Wires with relatively low tensile strength factors, such as aluminium and copper wires, can therefore not be stranded with such guides.

A brochure from Messrs. Pourtier, France, also shows a stranding machine in which the individual rotor sections are linked by yokes and the wire guiding elements are arranged on the insides of the yokes in the form of small rollers. In this type of wire guide the wires are guided over the rollers at the starting up and decelerating phase. Thus, in contrast with guidance by nipples, the enormous increase in tensile forces in the material being stranded is avoided, and it is theoretically possible to strand aluminium and copper wires. With the high speeds which are necessary for the rotors, the individual flyers are very heavily loaded by the guide rollers and need to be of far more solid construction than with the nipple type of guidance.This leads to a considerable increase in the revolving weight of the rotor, to higher driving power, to substantially heavier loads on the bearings and thus to a shortening of the life of the roller bearings.

At the uniform phase of operation, when the rotors have reached their operational rotating speed, the material being stranded is applied to the inner surface of the flyers. Constant friction of the wire damages the surface of the flyers, which are very solid, and the flyers have to be exchanged. This results in increased costs for the manufacturer and machinery out of action.

According to the present invention there is provided a wire guiding flyer means for use on the rotor of a tubeless stranding machine of the type having a flyer extending between bearing stands to guide the material being stranded, said flyer comprising two thin high strength bands spaced one on top of the other with transversely extending guide rollers arranged between them, said guide rollers being held in short lateral fitting members in which they are mounted for rotation, and said two bands being detachably joined together by spacer members.

The invention further provides for the distance between the guide rollers and the inner band of the guide yoke to be such that the wire cannot touch the outside of the inner band during the movement phase of the material being stranded.

Further according to the invention, the guide rollers have cylindrical surfaces.

The function of the individual wire guide flyer is to guide the material being stranded during the non-uniform phase without additional sliding friction. The reels from which the material being stranded is unwound are decelerated, by means of known reel brakes, only sufficiently to prevent the reels from continuing to run when the stranding machine is switched off or when the tension is removed from the wire. The material being stranded therefore lies on the guide rollers until the speed of the rotor is high enough for the centrifugal force to overcome the tensile force applied. As the centrifugal force increases, the material being stranded is laid against the inside of the outer band of the guide yoke.In the normal operating phase there is indeed abrasion between the material being stranded and the inside of the outer band, but it does not increase the tensile force on the wire to any considerable extent.

When the outer band becomes worn it can easily be exchanged and replaced without dismantling the guide flyer.

An embodiment of the invention will now be described, by way of an example, with reference to the accompanying drawings, in which: Figure 1 is an overall side view of the wire guidance flyer between two rotor sections in a tubeless stranding machine; Figure 2 shows the flyer in cross-section, together with the guiding roller, and Figure 3 shows the flyer in cross-section, in the region of the spacers.

The wire guide shown in Figures 1 to 3 comprises the rotor sections 3, 4 rotating in spaced-apart bearing stands 1, 2. The rotor sections 3, 4 are frusto-conical, mounted for rotation at their axle journals 5 in the bearing stands 1, 2 and driven synchronously by a common transmission 11. The crade frame 6, which is mounted between the rotor sections 3, 4 for easy pendulating movement on their journals, supports a reel 7. The guide flyers 8 extend between and are fixed to the rotor sections 3 and 4. The individual guide flyers 8 each comprise two tin, high strength bands 9 and 10, which are arranged one above the other and radially spaced apart on a radial line struck from the rotational axis. Guide rollers 12 are arranged between the two bands 9, 10, in such a way that the wire 13 which passes between the bands 9 and 10 under tension cannot touch the surface of the inner band 9.The guide rollers 12 are held between the bands 9, 10 and at the same time mounted for easy rotation therein by lateral fitting members 14. To provide further stabilisation for the guide flyer 8 and lateral guidance for the wires 13, spacers 1 5 extend between the bands 9, 10 and are fixed by screws in the regions between the guide rollers 12. The bands 9, 10 of the flyer 8 are fixed in such a way that the outer band 10 can be removed and replaced by a different one without dismantling the flyer 8. The wire guiding arrangement has the great advantage that the flyer is very stable in shape and tension proof despite its low weight. Added to this is the fact that only the outer band 10 need be changed in the event of wear. Furthermore the driving power is relatively small as a result of the favourable flow conditions in the design of the guide flyer and the whole wire guiding arrangement. The new wire guide flyer allows low tension resistant wires to be stranded, such as copper and aluminium wires. The stranding machines fitted with it can therefore be used more universally.

Claims

1. A wire guiding flyer means for use on the rotor of a tubeless stranding machine of the type having a flyer extending between bearing stands to guide the material being stranded, said flyer comprising two thin high strength bands spaced one on top of the other with transversely extending guide rollers arranged between them, said guide rollers being held in short lateral fitting members in which they are mounted for rotation, and said two bands being detachably joined together by spacer members.

2. A wire guide flyer as claimed in claim 1, in which the guide rollers are arranged at a spacing on the inner band such that the or each wire guided by the flyer does not touch the outer side of the inner band during the movement along the flyer of the material being stranded.

3. A wire guide flyer as claimed in claim 1 or claim 2, in which the guide rollers have a cylindrical shape.

4. A wire guiding flyer for use on the rotor of a tubeless stranding machine of the type having a flyer extending between bearing stands to guide the material being stranded, substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.

5. A tubeless stranding machine provided with a wire guiding flyer as claimed in any preceding claim.