RU109112U1 - ROPE STEEL MULTI-ORDER SMALL-ROLLING - Google Patents

Abstract

 A steel rope containing a metal core of three strands (1) with a diameter equal to D1, around which are twisted with alternating three strands (2) with a diameter equal to D2, and three strands (3) with a diameter equal to D3, twelve strands are located around the core (4 ) with a diameter equal to D4, and the direction of the core lay is opposite to the direction of the lay of the rope, all strands of the rope consist of six wires twisted around one central wire, all the strands are plastically deformed, the ratio of the diameters of the strands comprising the rope is D1 / D2 = 0.6-0, 9, D1 / D3 = 0.4-0.8, D1 / D4 = 0.4-0.8.

Description

Steel multi-strand rope, low twist, structures 12 × 7 (1 + 6) + 3 × 7 (1 + 6) / 3 × 7 (1 + 6) + 3 × 7 (1 + 6) using plastically crimped strands.

This device (rope) is intended for use on truck cranes, crane manipulators and other lifting installations as a lifting rope.

Six-strand ropes according to GOST 2688-80 and multi-strand ropes according to GOST 7681-80 and GOST 3088-80 are known from the prior art. These ropes differ in design, as well as in the fact that the manufacture is carried out without the use of calibrating devices. The use of these ropes as truck hoisting cranes was based on the relatively low tensile loads and the relatively low cost of these ropes. However, in the process of operating the ropes on truck cranes and crane manipulators, hoisting ropes are subjected to various types of wear, depending on the nature of the loads, the ratio of the diameter of the block to the diameter of the rope, safety factor, and environmental conditions. Thus, crane hoisting ropes according to the conditions of their work should have the highest performance;

have sufficient strength at the smallest diameter; have sufficient flexibility; perceive dynamic loads; resist abrasion and fatigue stress from repeated alternating bends on the blocks and the drum; possess torsion resistance around its axis.

All these factors cast doubt on the use of ropes according to GOST 2688-80, GOST 7681-80 and GOST 3088-80.

The problem to which the technical solution is directed is to manufacture steel multi-strand ropes with an increased service life.

The task is achieved by changing the design and manufacturing technology of ropes. Ropes are made of wire according to GOST 7372-79. The design of the rope 12 × 7 (1 + 6) + 3 × 7 (1 + 6) / 3 × 7 (1 + 6) + 3 × 7 (1 + 6) All strands of the rope, including the strands of the core, are made crimped. Plastic compression of the strands is carried out by pulling the finished strand through a roller cassette or a monolithic fiber installed in the caliper of the spinning machine.

Ropes are made on a cable car in two technological operations. The first operation is the manufacture of a core from crimped strands of a 3 × 7 (1 + 6) / 3 × 7 (1 + 6) + 3 × 7 (1 + 6) design.

The second operation is the manufacture of a rope of construction 12 × 7 (1 + 6) + 3 × 7 (1 + 6) / 3 × 7 (1 + 6) + 3 × 7 (1 + 6). In this case, the core and rope are twisted in the opposite direction.

The ratio of the diameters of the strands of the core of the first layer to the strands of the core of the second layer of smaller diameter is: D ₁ / D ₂ = (0.6-0.9), to the strands of the core of the second layer of larger diameter D ₁ / D ₃ = (0.4-0 ,8); to the strands of the external layer D _i / D ₄ = (0.4-0.8).

An example of a specific design: A rope is made of a construction 12 × 7 (1 + 6) + 3 × 7 (1 + 6) / 3 × 7 (1 + 6) + 3 × 7 (1 + 6). The manufacture of strands of construction 1 + 6 is made of wire according to GOST 7372-79. The diameter of the strand of the first layer (1) of the core is 1.05 mm, the diameter of the constituent strand of wires 0.40 mm is the central one, 0.35 mm in the midwire. The strands of the second layer of the core are made of different diameters and are arranged in a rope with alternation. The strands of smaller diameter (2) are made of wire with a diameter of 0.55 mm central and 0.50 mm in a cord. The diameter of the strand is 1.45 mm. Larger strands (3) are made from a wire with a diameter of 0.70 mm central and 0.60 mm in a cord. The diameter of the strand is 1.85 mm. The direction of the lay of all strands of the core is left. The core is manufactured in one technological operation. The direction of the core lay is left. The core diameter is 5.20 mm, the pitch of the lay is 33.8 mm.

The manufacture of strands of the third layer (4) is made of wire with a diameter of 0.60 mm - the center and 0.55 mm - in the midwife. The diameter of the strand is 1.55 mm, the direction of the strand is left.

The manufacture of the rope is made on the right lay, in increments of 56.0 mm. The diameter of the rope is 8.0 mm, the cross-sectional area of all the wires in the rope is 29.0 mm ² , the total tensile strength of the rope is 52.0 kN.

This rope design allows you to get a more balanced, non-spinning rope. Plastic compression of all strands of the rope allows you to increase the cross-sectional area and, accordingly, the total breaking strength, and breaking strength of the rope as a whole.

Due to the greater number of strands and wires constituting the rope (compared to previously used ropes according to GOST 2688-80, 7681-80), these ropes are more flexible, which favorably affects the state of the rope during the multi-layer winding of the rope on the drum and when working with a small diameter ratio block to the diameter of the rope.

Thus, the proposed design of multi-strand, low-twisting ropes allows to obtain ropes with improved performance and extended service life.

Claims (1)

A steel rope containing a metal core of three strands (1) with a diameter equal to D ₁ , around which are twisted with alternating three strands (2) with a diameter equal to D ₂ , and three strands (3) with a diameter equal to D ₃ , twelve are located around the core strands (4) with a diameter equal to D ₄ , and the direction of the core lay is opposite to the direction of the strand of the rope, all strands of the rope consist of six wires twisted around one central wire, all the strands are plastically deformed, the ratio of the diameters of the strands comprising the rope is D ₁ / D ₂ = 0.6-0.9, D ₁ / D ₃ = 0.4-0.8 D ₁ / D ₄ = 0.4-0.8.