RU2322621C1 - Method of production of rope elastic-hysteresis element - Google Patents

Abstract

FIELD: mechanical engineering.

SUBSTANCE: method can be used for production of rope vibration isolators for vibration protection of devices and equipment at any branch of technology. Core is formed due to bending metal rod to get toroid-shaped ring. Ends of rod are tightly connected together. Rope is untwisted and rope screw bundle is plaited around core. Two free ends of bundle are welded together. Joints of tight connections of rod and bundles are set apart at angular direction by 180°.

EFFECT: improved efficiency of suppression of vibrations; improved carrier ability of vibration isolator.

Description

The invention relates to mechanical engineering and can be used in the manufacture of cable vibration isolators for vibration protection of instruments and equipment in any field of technology.

A known method of forming a cable elastic hysteresis elements of vibration isolators, where the formation of the elements is done by pre-winding the cable onto the rods mounted on the mandrel, with the formation of return loops and straight sections of the cable between the return loops, with fixing the shape of the loops on the rods, for example, due to the plastic compression of the cable on each of the rods, and the subsequent gouging of the straight sections by fixing the return loops in the clips of the vibration isolator. It is possible to form elastic hysteresis elements by pre-winding the cable onto the rods mounted on the mandrel with the formation of two return loops and intersecting sections between them (Pat. 2082039 RF, IPC F16F 7/14. Method for forming elastic hysteresis elements of cable vibration isolators. / Ponomarev Yu.K. and other // BI. No. 17, 1997).

The disadvantage of this method is the presence of two ends of the elastic hysteresis elements, which, as a rule, with insufficient clamping in the clips of the vibration isolator tend to get out of the details of the clip covering the cable, which as a result weakens the load capacity of the vibration isolator in operation.

A known method of forming elastic hysteresis cable elements, including the operation of weaving a standard cable into screw strands, twisting this strand five times around itself to obtain a toroidal ring with a hollow core and soldering the two free ends of the screw strand (Pat. 2179667 RF, IPC F16F 7/14, F16G 11/00. Cable vibration isolator / V.A. Antipov et al. // BI No. 5, 2002).

This method of forming a cable element is selected by the authors as a prototype of the invention.

The disadvantage of this method is the low bearing capacity of the finished product and the lack of effectiveness of vibration protection.

The technical result is to increase the efficiency of vibration suppression and increase the bearing capacity of the vibration isolator.

The technical result is achieved by the fact that in the known method of manufacturing a rope elastic hysteresis element, including braiding a cable into strands, braiding a cable screw strand and soldering two ends of the strand, they first form a core by bending a metal rod into a toroidal ring, its ends are rigidly connected, and multiple weave around core with a cable screw strand, and the joints of the rigid joints of the rod and the strand are carried in an angular direction by 180 °.

The principal difference of the proposed method for manufacturing a cable elastic hysteresis element is, firstly, that multiple braiding of a cable screw strand is carried out around a core made in the form of a torus from a metal rod with subsequent rigid connection of its ends. This event allows you to significantly (hundreds of percent) increase the stiffness and bearing capacity of the finished product. Additional dispersion of vibration energy occurs due to the work of friction forces at the points of contact of the screw strand with the core. This increases the efficiency of vibration suppression. Secondly, the proposed method has more common features compared to the prototype, for example, multiple weaving of a cable screw strand instead of five-fold and a rigid connection of the ends of the strand instead of soldering.

Thirdly, the separation of the rigid joints of the strand and core by 180 ° increases the reliability of fastening the elastic-hysteresis elements in the clips, thereby increasing the resource of the finished product.

The method is carried out as follows.

First, a cable is twisted, twisted from several multicore strands. In this case, a strand with a helical axis is obtained. Then a toroidal core is formed from a segment of an elastic metal rod and its ends are rigidly connected.

Next, multiple braiding of the screw strand around the toroidal core is carried out and its ends are rigidly connected, and the joints of the core and screw strand are 180 ° apart.

By changing the structure of the core of the elastic hysteresis cable element and the pulling force of the cable strand during winding, the stiffness and damping properties of the finished product are easily controlled.

The result is a finished product in which the bearing capacity and vibration suppression efficiency is increased due to the introduction of a core formed from a piece of an elastic metal rod followed by a rigid connection into a toroidal ring.

In the structure of the elastic-hysteresis element, multiple linear contact of rubbing pairs is realized, and often surface contact, while the wires in the cable and the strand are generally elastically drawn together due to braiding with a predetermined tightness of the screw strand of the standard cable around the core. In this case, the contact area of the rubbing parts in the elastic-hysteresis element is increased. The mutual slippage of the wires during the deformation of the cable leads to the appearance of diffused cyclic energy. Due to energy dissipation, the vibrations of the object are damped and the loads on it are reduced during impacts, and the spacing of the ends with a rigid connection of the screw lock and the steel core in an angular direction by 180 ° provides an increase in the bearing capacity and reliability of fastening of the vibration isolator.

The proposed method of manufacturing a vibration isolator improves the efficiency and bearing capacity of the finished product, increases the reliability and durability of parts and components of machines and mechanisms.

For rough calculations, the use of new elasto-hysteresis elements manufactured by the proposed technology gives an increase and improvement of the following indicators (for the “average” conditional product):

1. The service life, including the stability of parameters in operation, is more than 2 times (up to 80,000 alternating loading cycles).

2. Bearing ability:

- in the axial direction, more than 2 times (up to 30 kg);

- in the radial direction, more than 3 times (up to 7 kg);

- the working stroke for compression (tension) is more than 1.5 times (up to 5 mm) with a total stroke of up to 10 mm. With the modular connection of such products, the stroke can be significantly increased;

- coefficient of reduction of overload by more than 1.5 times (up to 6.2) per product.

Claims (1)

A method of manufacturing a cable elastic hysteresis element, including braiding a cable, braiding with a cable screw strand and brazing two free ends of the strand, characterized in that the core is first formed by bending a metal rod into a toroidal ring, its ends are rigidly connected, multiple braiding is made around the core with a cable screw strand, moreover, the joints of the rigid joints of the rod and strands are carried in an angular direction by 180 °.