SU1753326A1 - Method and device for non-disassebly fault finding of roller bearing working surface - Google Patents

Abstract

Use: mechanical engineering, defects, quality control. The essence of the invention: a device implementing the method comprises a contactless current collector 1. movable ring 2, fixed ring 3, contact current collector 4, discriminator 5, frequency meter 6, meter 7 of duration. 2 sec. F-Py, 1 Il.

Description

The invention relates to mechanical engineering, and in particular to methods of bearing detection during operation and repair of machines and mechanisms.

Known methods for assessing the condition of bearings by monitoring the ease of rotation, by electrical parameters:

There is a known method for detecting the working surfaces of rolling bearings, which consists in measuring the contact potential difference between the rings of a rotating bearing, highlighting the extrema of one polarity of the specified contact potential difference, measuring the repetition rate of the extrema of one polarity and defective bearings when the inequality fl> f2, "

where fi and f2 are the repetition rates of the extrema of the same polarity of the defectable and reference bearings, respectively.

The disadvantage of this method is the low accuracy of the detection. With this method of detection, only the number of defects is detected, but their linear dimensions (length along the rolling direction) are not taken into account.

The purpose of the invention is to increase the accuracy of defective bearings by identifying defects having unacceptable dimensions.

This goal is achieved by the fact that in a method that includes measuring the contact potential difference between the rings of a rotating bearing, isolating the extrema of the same polarity of the specified contact potential difference, measuring the repetition rate of the extrema of the same polarity, they additionally measure the integral duration of the extrema of the same polarity and reject the bearings when the inequalities ffi> 1 f2 ^{T1> 'T2} · where f 1, f2 ~ repetition frequency extrema of one polarity and a reference, respectively defektiruemogo podshipni s;

7Ί, Tg are the integral durations of extrema of the same polarity of the detected and reference bearings, respectively, as well as the fact that the device implements a method comprising a contactless pulses of the contact potential difference between the rings of the rotating bearing, connected to the input of the discriminator, the output of which is connected to the input of the frequency meter, integrated duration meter, the input of which is connected to the output of the discriminator.

The drawing shows a diagram of a device that implements the method.

The method is as follows.

When the bearing rotates as a result of interaction in the contact zone of the rolling elements with the rings, pulses of the contact potential difference (CLC) arise. Frequency and integral pulse duration (PKP). The frequency and integral pulse width of the CRP depends on the state of the surfaces of the rolling bodies and rings. The pulses of the KRP from the rotating ring 2 are removed by a contactless puller 1 pulses. from a fixed ring 3 - by a contact puller 4. Pulses of the KRP are applied to the discriminator 5, where the extrema of this signal of the same polarity are distinguished. In the frequency counter 6, the frequency f1 of the extracted signal is measured and compared with the reference frequency f2 (signal frequency from the reference bearing). In the duration meter 7, the integral duration of the extracted signal T1 of the detected bearing is measured and compared with the integral duration Tg of the reference bearing.

Under the conditions

J * fl> f2 I b> T2 at least at one level of discrimination (at least at one amplitude of the identified extrema), the bearing is rejected.

The method allows to increase the accuracy of detection of working surfaces of rolling bearings by 20-25%.

Claims (2)

Claim 1. A method for in-place detection of the working surface of a rolling bearing, including measuring the contact potential difference between the rings of a rotating bearing, isolating the extrema of the same polarity of the indicated contact potential difference, measuring the frequency of the extrema of the same polarity and rejecting the bearings when the inequality fi> f2 is fulfilled, where fi, ft - the repetition rate of extremes of the same polarity of the detected and reference bearings, respectively, characterized in that, in order to improve the accuracy of the defect and measured integral5 hydrochloric extrema duration of one polarity and bearings is rejected if the inequality Τι> Τ ₂ . where Τι, Ta are the integral durations of extrema of the same polarity of the defectable and reference bearings, respectively. 2. The device of an in-place defect of the working surface of a bearing 1753326, comprising a contactless pulse puller of the contact potential difference between the rings of the rotating bearing, connected to the input 5 of the discriminator, the output of which is connected to the input of the frequency meter, characterized in that, in order to increase the accuracy of the detection, it is equipped with a meter integral duration, the input of which 10 is connected to the output of the discriminator.