SU547486A1 - Rope twist method - Google Patents

Description

(54) METHOD OF CANOPY CANVA

one

The invention relates to the manufacture of ropes, cables, cords and other twisted products.

Known way of twisting the rope double twist bundle swivel elements with subsequent winding on the drum 1.

In this method, the twisting is carried out by twisting the beam of the elements to be swiveled by rotating the loop-curved part of this beam. For this, the bundle of elements to be swirled is twisted at the primary twist section, then, with the help of rollers, the wires are deflected from the axis of rotation in the form of a loop rotating around the receiving drum and rubbed onto the drum in the opposite direction, exposing the section with the first twist to the secondary twisting.

The main disadvantage of this method is that in the area of the primary twist, the swirling elements are naturally drawn out of the charging coils only for the length required. for the first one, the product is twisted, and in the section of the secondary twist, the product is twisted only due to the axial deformation of its elements: the outer layers are stretched, and the inner layers are compressed, i.e. on the section of the secondary belt: the roll is carried out due to the tensioned lengths of the elements. Therefore, in the section of the secondary twist, the swiveling elements must either be stretched, or shortened (in the inner layers), or, if the swiveling elements are tin (lanrimer steel wires), the buckling of the compressed layers is lost, which leads to looping of the product and disruption of the stranding process.

For this reason, the double twist way, despite its well-known advantages, has only limited use, for example, only for twisting cords, hemp ropes, organic cores, twisted yarns, and cable cores with a large twig string, i.e. in those cases when the swiveling elements have significant elasticity for twisting in the secondary twisting section.

Normal twisting of twisted articles from low-stretch elements, for example, wire strands and ropes, is not provided by the double twist method.

The purpose of the invention is to improve the quality of the ropes.

Claims (2)

This is achieved by the fact that the bundle of swiveling elements is preliminarily subjected to an additional twist in the direction of twist of the rope and partial unscrewing, and the value of the additional twist is equal to the twist of the hotspot product. In the pre-twist npciaecce, the swiveling elements are twisted from charge coils of length necessary for the secondary twist, which ensures that the lengths of its elements are twisted into the rope. The drawing shows the scheme of the rope. The bundle 1 is fed to the device 2 by an additional pre-twist, which rotates at an angular speed w ,, draws in and twists the bundle of wires on the section Ac. At the exit from the pre-twist device, the product enters the double twist frame 3 angular skrost w in the same direction as the device 2 preliminary twist. Further, the passage of the double twist frame, the product enters the receiving drum 4, before entering which in section B receives a secondary twist with an angular speed W2 The device 2 of the preliminary twisting and unscrewing of the beam 1 of the swiveling elements can be performed, in the form of a rotating frame, the passage of which, the product bends around three blocks fixed to it. The initial parameter for the kinematics of a method is the drawing rate of an article V, which, by continuity, is the same along its entire length from the center of the strand to the receiving drum. Per unit of time, the product moves by a length S V. At this length, due to the rotation of the device 2 of the preliminary twist on section A, the angle of rotation of the cross-section of the product p Wi is obtained. Therefore, the torsion of the product, as the angle of twisting per unit of dashpa, is: ,, 0) 1 5 V When entering from the preliminary twisting device 2, the product spins with the angular velocity Wi and twists with the angular velocity W2. In this case, the residual crzchest on section C will be equal, U) j - 6J + (jOEi a) VV On section B, the torsion doubles to, ak. Thus, the pre-twist does not affect the amount of torsion of the finished product, but only drawing wires from charge coils for the length necessary to twist the beam with an angular velocity Wj. Therefore, in order for the wire lengths drawn from the charging coils to be equal to their unstressed lengths in the finished product, it is necessary that Kj Kz from where we get aj.L a602 This equality should be considered as an ideal condition, since its output does not take into account the slippage of the product (procrastination) in the preliminary and double twist devices, as well as the possible transfer of torsion turns from section A to section B. In fact, it is important that the approximate equality Wi l, sr.2 W2, and the specific value wi be set by calculation or by optic method, depending on the construct of the manual. The equality of the torsion of products in areas A and B means the equality of the lengths of the twisted wires per unit length of the product, and hence the equality of the corresponding tensions in the wires. This opens up the possibility for widespread use of this method in the manufacture of ropes with any twist, any multi-layered linear touch structures and a significant increase in the performance of the stranding process. Claim 1. The method of twisting the rope with a double twist bow of the swiveling elements with subsequent winding on the drum, characterized in that, in order to improve the quality of the ropes, the bundle of the swiveling elements is previously subjected to an additional twist in the direction of twisting of the rope and partial unscrewing. 2. A method according to claim 1, characterized in that the amount of additional twist is equal to the twist of the finished rope. Sources of information taken into account in the examination: 1. Buckshteyn M "A" Production and use of steel ropes, Mo, 1973, p. 150  /., ..