SU1717519A1 - Magnetic lining of rope sheaves - Google Patents

Abstract

The invention relates to lifting devices. SUMMARY OF THE INVENTION: Magnetic liner liners are mounted on a pulley rim with a gap relative to each other. The liners are made of polymer material. The inserts are movably mounted and face each other with like poles. The magnetic lining is firmly held when it is peeled off, while the lining inserts are easily shifted, which ensures the mutual repulsion of the like poles of the liners. 3 il.

Description

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The invention relates to lifting devices (e.g., to pile driving pulleys of mine and mine hoisting installations, to drilling rigs of drilling rigs, etc.) and can be used as a replaceable lining for cable guide pulleys.

The aim of the invention is to increase the reliability of operation by ensuring uniform wear of the lining.

Figure 1 shows a portion of a pulley rim within a pulley spanning arc of a rope with a magnetic lining arranged in a rim; figure 2 is a cross section aa in figure 1; Fig. 3 shows a pulley with a part of the rim with a laid magnetic lining outside the pulley spanning arc of a rope.

Lining liners 1 are made of a polymer material with magnetic properties, such as polyamide PA-6, filled with ferromagnetic powder, and

2 pulleys with variable gaps b are located in the rim within the pulley spanning arc, the lining liners are placed with a constant gap 62. The lining liners 1 are installed with respect to each other by the same poles. On the liner liners 1 laid hoisting rope 3.

Magnetic lining works as follows.

When the pulley with rim 2 rotates in the direction indicated by the arrow (load lifting), the rope 3 will overlap the pulley and within the span arc, the tension in the rope 3 in the absence of dynamic loads will change according to Euler's law in proportion to the value 1 (where I - the base of natural logarithms; f is the coefficient of friction; a is the angle of coverage of the pulley with a rope). In accordance with the law of tension in rope 3, the last (according to Hooke's law)

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will receive a variable on the coverage arc elastic elongation.

The wires of the rope 3 are pressed into the surface of the liners 1, and the rope 3 is bonded to the liners 1 with the rim 2 of the pulleys. As a result, gaps 5i are established between the liner liners 1, the magnitude of which within the spanning arc will vary from the point of rope 2 to the pulley rim 2 to the belting point of the rope 3 from the rim 2 pulleys in accordance with the change in elastic stretch of the rope 3.

In the presence of dynamic stresses in the rope 3, the nature of the elastic stretching of the latter can be any other, i.e. not conforming to Euler's law, however, the gaps di will always correspond to the actual law of change of the elastic stretching of the rope 3 within the spanning arc (in this case, one of the liners 1 will be very close together, and an increased gap 5i will be established between the others).

When the lining liners 1 come out during the operation of the pulley from the limits of the pulley spanning arc of the rope 3, due to the fact that the lining liners are turned towards each other with the same poles, the closely spaced liners 1 will be pushed away from each other. As a result, the inserts 1 are displaced and a constant value of the gap H2 is established between them. Due to this displacement of the liners 1 outside the pulley span arc cable 3, the variable gap size d, due to the elastic stretching of the rope 3, is always reset to the initial state with the constant gap gap set. If there was no self-setting of the gap dg between the inserts with each turn of the pulley, the inserts 1 would eventually get lost into a tight group without a gap, and the rope 3 in the process of elastic stretching, moving relative to the inserts 1, would forcefully wear the inserts 1. This would happen because, in contrast to the proposed magnetic lining (the elements of which move with the rope and the liners are worn at the point of contact with the rim 2, where specific pressures operate) in the absence of a self-clearance of gap 5a elastic

The stretching moves relative to the liners 1. In this case, the wear of the liners 1 occurs at the point of contact of the rope 3 with the liner liners 1, where high values of specific pressures exist.

The magnetic lining is firmly held when it is peeled off (i.e., under the action of centrifugal forces outside the arc of the pulley rope 3). At the same time, in accordance with the peculiarities of the work of the permanent

The magnets in the tangential direction of the liner liners 1 are relatively easily shifted, which ensures mutual repulsion of the like poles of the liners and the establishment of the gap 6g.

Along with this, it is possible (with full safety in operation) to wear the lining liners 1 to the full thickness up to the rim of the pulley.

Claims (1)

Magnetic lining of cable pulleys, including lining liners with magnetic properties, mounted on the rim of the pulley with a gap relative to each other, characterized in that, in order to increase reliability in operation by ensuring uniform wear of the lining, lining liners made of a polymeric material, movably mounted around the circumference on the rim of the cable pulley and facing each other like poles. LA FIG i A- / 2