CS211085B1 - Method of corrosion prevention of balancing wire rope of circular cross section - Google Patents

Description

BACKGROUND OF THE INVENTION The present invention relates to a method of anticorrosive protection of an equalizing wire rope of circular cross-section which is used in environments with an increased risk of corrosion, in particular in underground mines.

Steel ropes are often used in environments that are corrosive to rope wires.

Corrosion leads to a reduction in the original size of the wire material, a loss of strength and the necessary mechanical properties of the wire. This shortens the operation time of the rope.

In extreme cases, the rope may be damaged by the load due to a considerable reduction in its load-bearing capacity due to corrosion.

Corrosion protection of steel ropes is achieved by applying a protective layer of lubricant to the rope or individual wires. In the case of ropes with textile inserts, anticorrosive protection of the wires in the inner parts of the rope is expected to be gradually pushed out by the lubricant during operation of the rope from the textile inset, which is impregnated with it and serves as a lubricant reservoir.

Another way of protection against corrosion is by plating steel wires with zinc or metals by others.

When operating ropes in a progressive and wet environment, these protection methods are not sufficiently effective. The lubricant applied to the wires is washed away with water. When the protective metal layer on the wires corrodes, the steel wire wires are directly corroded.

The use of rubber or plastic to protect the ropes against corrosion is more efficient, as these materials are insensitive to the effects of the corrosive environment.

Existing methods of protection by means of plastics are carried out in such a way that the gaps between strands or wires of the rope are filled with protective material over the entire cross-section of the rope (NSR Patent Nos. 1 270 450 and 881 763). the strands treated in this way are made of rope (German Patent No. 2,630,417).

Other methods of protection are carried out in such a way that the rope is filled with gaps and rubber and the wire core surface is covered with an additional layer of plastic as a backing for rope strands which are no longer protected (German Patent No. 2,548,162,

(German Patent No. 2 703 670), or the gaps of one of the inner layers of the rope strands are filled with plastic (German Patent No. 2 031 895).

For single-stranded conductors or prestressing elements consisting of round or parallel shaped wires, the plastic protection is combined with a metal sheath (British Patent Nos. 1 133 007 and 1 394 362).

In cases where the plastic protection is accomplished by filling the gaps between the strands along the entire cross-section of the rope and on its surface, adjacent strands in the layer are made in the opposite winding direction (British Patent No. 1 197 329).

The protection provided only on the inner parts of the rope, eg the wire core or one of the inner layers of the rope strands, exposes the wires and strands to the surface of the rope, which remain unprotected.

Said methods of protection must be carried out during the production of the rope, which increases the demands on the rope production equipment.

The aforementioned drawbacks are remedied by the method of anticorrosion protection of the round wire rope according to the invention, which consists in applying to the rope a protective layer of a corrosion-resistant elastic mass which does not completely fill the gaps between the rope strands and the inner surface is adapted to the shape of the rope surface. An intermediate layer of any material of a maximum thickness of 1 mm may be interposed between the protective layer and the strand strands. The protective layer is applied to the rope only after the rope has been made.

A protective layer on the surface of the rope made, for example, of rubber or plastic, forming a closed sheath along its entire length, prevents the corrosive environment from reaching the rope strands. In this way, effective corrosion protection is achieved without limiting the protection to only a part of the rope strands. By providing a protective sheath that does not completely fill the gaps between the strands, the longitudinal and transverse movement of the strands due to the variable load of the flax during operation is allowed, since the protective layer on the rope surface does not prevent or hinder it. This makes it possible to equalize the different loads in the individual layers of the rope strands without secondary effects on the integrity and external state of the protective layer. The protective layer can be applied to the rope produced, therefore it is possible to use this method of protection for any type of rope, without the use of the necessary device for applying the protective layer in the rope production itself. This greatly reduces the requirements for rope-producing devices with effective corrosion protection and extends the possibility of using this method of rope corrosion protection.

In balancing ropes used in potentially explosive atmospheres, it is possible to use a material with a desired conductivity to form a protective layer of material, thereby avoiding the formation of an electric charge or allowing it to be led to a desired location. ₍

In order to achieve the necessary thickness and shape of the protective sheath layer of the balancing rope, the respective rope can be coated with a thin layer of paper or plastic tape before the protective material is applied. This prevents the protective sheath material from entering the gaps between the strands of the rope and allows the uniform thickness of the protective pha to be formed over the entire circumference and the length of the equalizing rope.

Examples of embodiments of the invention are shown in Figures 1 and 2.

FIG. 1 shows a protective layer J applied to the surface of a steel wire consisting of six strands 2 and a textile insert J. The inner surface X of the protective layer χ is adapted to the shape of the rope surface.

Fig. 2 shows a protective layer X applied to the surface of a steel wire consisting of six strands 2 and a textile insert J, which is wrapped with an auxiliary layer X formed by a tape of eg paper or plastic up to 1 mm thick.

The protective layer may be applied to the rope, for example, by applying a layer of suitable material of the desired thickness to the steel wire produced without a protective lubricant on its surface. If, for example, technical rubber is used, the application is carried out by continuously spraying the rubber mixture with a pressure device followed by vulcanization and cooling on the vulcanization line. In doing so, the effect of the natural moisture and lubricant contained within the rope causes the rubber layer to not completely fill the gaps between the strands. The same procedure can be used if, prior to applying the protective layer, the rope is wrapped along its entire length with an auxiliary layer made of paper or plastic tape, which, in particular for ropes of larger diameters, prevents the increased effect of natural moisture and lubricant contained within the rope. applied rubber mixtures.

The leveling ropes with a protective layer on the surface according to the invention can be used in environments with corrosive effects, in particular for mining equipment for vertical transport in underground mines.

Claims (1)

SUBJECT OF THE INVENTION Method of anticorrosive protection of an equalizing wire rope of circular cross-section, characterized in that on the rope is applied a protective layer (1) made of corrosion-resistant elastic material, completely filling the gaps between the rope strands (2). ) is adapted to the shape of the rope surface.