SU1055913A1 - Sliding bearing - Google Patents

Abstract

1. SUSHOLTING SUPPORT, containing a metal shaft, a housing and an insert installed in the housing, made in the form of a package replacing at least three coaxially arranged bushings, the middle of which is made of polymer, and the inner AND outer is made of metal In order to increase durability when working in electrically conductive media, the sleeve facing the shaft is made of metal with a more positive value of the electrode potential than the metal of the external sleeve and is electrically connected with the external sleeve.

Description

, 2i, The support according to claim 1, 1, which means that the inner sleeve is made of copper and the outer of aluminum.

one

This invention relates to slide bearings operating in aggressive environments.

Many friction units of the machinery and equipment of the chemical, oil mining, metallurgical, food and other industrial sectors work in contact with corrosive media. The details of such assemblies are subject to corrosive-mechanical fy wear in electrically conductive environments, the second are acidic and alkaline, salt solutions and melts, many Technological products of food and other industries. To reduce corrosion losses and increase equipment life, electrochemical methods are used to protect metals from corrosion, in particular, anodic protection. However, these methods did not find application in the nodes of friction because of the cumbersome electrical sources of polarization that significantly complicate the design of machines.

A known insulating insert of a sliding bearing is made of a composite of outer and inner metal bushings between which an electrically insulating sleeve is placed, and the ends of the insert are covered with a sealing and electrically insulating layer TIJ.

However, the operation of such a bearing in electrically conductive media can lead to a sorozionno-mechanical wear of metal parts ..

The most technical to the invention according to its technical essence and the achieved result is a sliding friction unit, including a metal shaft, body: with an insert mounted in the case, made in the form of a package of alternating coaxial metal and metal graphite bushings 23.

However, the known assembly does not contain devices for protecting the shaft from corr (} zionno-mechanical izashashivanie, resulting in a node resource when operating in electrolytes is very limited. Increasing the resource node is associated with the use of special seals that complicate and increase the 1ax design.

The aim of the invention is to increase the durability of the support in electrically conductive media.

The goal is achieved by the fact that in the slide bearing, a metal shaft, a housing and inserts in the housing are inserted, the insert is made in the form of a package of at least three alternating coaxial bushings, the middle of which is made of polymer, the shaft facing the shaft is made of metal This is a more positive value of the electrode potential than the metal from which the outer sleeve is made, and these sleeves are electrically connected to each other.

In addition, the inner sleeve is made of copper, and the outer is made of aluminum.

The drawing shows the design of the proposed slide bearing. The support comprises a steel shaft T and an insert consisting of cylindrical sleeves. The inner sleeve 2 is made of a metal that has a more positive electrode potential value than the metal from which the sleeve is made.

For example, sleeve 2 can be made of copper, and sleeve 3 can be made of

aluminum, characterized in the voltage range by standard electrode potentials of +0.34 and -1.66 V, respectively. Bushes 2 and 3 are separated by a layer 4, 200 μm thick, from

poliviilbutiral forming an adhesive compound with them. The liner is installed in the housing 5, for example from plastic, in this way. j i that the metal cover 6 contacts with the sleeves 2 and 3, electrically connecting them with each other. . In connection with the housing 5 and the cover 6, a rubber sealing gasket 7 is installed. The assembly works in the following manner. When the shaft rotates in an electrically conductive medium, for example, in a NaCI solution, frictional heating of the liner to 330-355 K occurs. Due to heating in an electric circuit consisting of sleeve 3, cover 6, sleeve 2 and interlayer 4, a density of about 5 appears Yu mA / cm. When the shaft is in contact with the copper sleeve 2, the electrode potential of the obtained results indicate significant (up to 6 times I

Reducing the intensity of corrosion-mechanical shaft wear

. in case of an electrical circuit of the insert, in comparison with the insert, the metallic bushings of which are electrically not connected with each other. For bearings in which the shaft is the most critical and expensive part, this reduction in wear

corresponds to a few;

support resource times. ,

The advantages of the proposed sliding support: the absence of seals, excluding the contact details of the assembly with an electrically conductive working fluid:

provision of electrochemical shaft protection without the use of external electrical sources; The useful use of frictional heating is a plug to generate a polarization current. 3 la shifts to the range of values corresponding to the passive state of the steel. This leads to a decrease in the intensity of corrosion-non-hachial shaft wear. The test of the proposed design of the slide bearing was carried out on the SMC-2 friction machine with an insert area of 2 cm, load, 35 Sha, skrl- speed: 4 m / s. The shaft was made of St45 steel, with a diameter of 40 mm and hardness HRC 40-45, roughness Rj., 0.8–1.0 microns. The wear rate was determined by the gravimetric method. The test results are given in Table 1d.

Claims (2)

1. SLIDING BRACKET, comprising a metal shaft, a housing and a liner installed in the housing, made in the form of a package of at least three coaxially located bushings, the middle of which is made of polymer, and the inner and outer ones are made of metal, cast with the fact that In order to increase durability when working in electrically conductive media, the sleeve facing the shaft is made of metal with a more positive electrode potential than the metal of the outer sleeve and is electrically connected to the outer sleeve. > 2 * Support according to claim 1, 'characterized by the fact that the inner sleeve is made of copper, and the outer one is made of aluminum.