RU1809346C - Method of estimating technical state of block bearing of working device - Google Patents

Abstract

Field of use: diagnosis of the technical condition of the mechanisms of combine harvesters. SUMMARY OF THE INVENTION: A method for assessing the technical condition of a working body support bearing consists in measuring the amplitude of the vibration signal of the working body bearing support from unbalanced inertia forces during acceleration of the working body shaft from a minimum stable rotational speed to a maximum. The value of the area under the curve corresponding to the dependence of the amplitude of the vibration signal on the rotational speed of the shaft of the working body is taken as a diagnostic parameter. 3 ill. (L C

Description

The invention relates to agricultural machinery, in particular to methods for diagnosing the technical condition of the mechanisms of combine harvesters.

The purpose of the invention is to increase the information content, accuracy and reduce the complexity of evaluating the technical condition of the thrust bearings.

The goal is achieved in that the measurement of the amplitudes of the vibration signal is carried out continuously during the acceleration of the shaft of the working body from the minimum stable speed to maximum, and the technical condition is estimated by comparing the area under the curve of the dependence of the amplitude of the vibration signal on the shaft speed with the reference.

In FIG. 1 is a diagram for evaluating the bearing; in FIG. 2 and 3 - graphs of the dependence of the vibration signal and speed

When the shaft 3 of the working body of the combine is rotated, pulses are received from the standard speed sensor 6 to the measuring device 4 and the result of the calculation of the speed is recorded by the recorder 5. At the same time, the vibration sensor 1 generates electric pulses. signal caused by the violation of the technical condition of the bearing 2, which are processed by the measuring device 4 and recorded by the recorder 5.

When the shaft speed 3 reaches a value corresponding to the minimum stable (rtmin) speed, the value of the amplitude of the vibration signal Amin c is recorded on the recorder 5. Then, the rotational speed of the shaft 3 is sharply increased to the maximum (n, groin). The measuring device 4 continuously measures the electrical signal from the vibration sensor 1 and transmits to the recorder 5. After

00

about u

О Oh

corresponding transformations, the recorder 5 indicates (on the terminal screen or paper) the maximum value of Amaxbc at n, axi and the curve of the amplitude of the vibration signal (n) during acceleration of the working body (see Fig. 2).

The general technical condition of the bearing is estimated by comparing the area under the curve of the dependence of the amplitude of the vibration signal on the shaft rotation frequency Si (Fig. 2) obtained during diagnosis with the area under the So curve (Fig. 3) obtained when diagnosing a reference bearing (acceptable for use). If Si So, then the bearing is considered defective and an analysis of the obtained diagnostic curve is carried out to identify a specific internal defect (to make a final decision). To this end, from the known dependence of the oscillation frequency of the vibration signal on the shaft rotation frequency, the shaft rotation frequency at which this defect appears is determined. For example, when a radial clearance appears in the rolling bearings, the informative rotation frequency of the shaft of the working element w will be determined from the following expression:

2 60 f ZT

Sun

-1h

, (min)

tBC

where f is the frequency of the generated vibration signal, Hz; 35 ZT is the number of rolling bodies.

0

5

Then, on the abscissa axis (see Figs. 2, 3), the rotational speed of this defect is noted. Restore the perpendiculars from the obtained points to the intersection with the curves of variation of the amplitude of the vibration signal. Compare the amplitude of the vibration signal at this point of the real bearing - Ap.i.bc with the amplitude of the vibration signal at the same point

5

0

5

- Ae. |.

Bc

If

longn.o. Bearing Ar. | .. | bc, there is a radial clearance inside the bearing.

Claims (1)

The claims A method for evaluating the determination of the technical condition of the support bearing of a working body, including measuring the amplitude of the vibration signal of the bearing support at various test loads from unbalanced inertia forces, determining the value of the diagnostic parameter from the measured amplitudes and comparing this parameter with a reference value, characterized in that, in order to improve accuracy , informative and reduce the complexity, the measurement of the amplitudes of the vibration signal is carried out continuously in the process of accelerating the shaft of the working body from a minimum a stable rotation frequency to the maximum, and as a diagnostic parameter, the area under the curve corresponding to the dependence of the amplitude of the vibration signal on the rotational speed of the working body shaft is taken. Figure 1 AK tv AND  mlnni FIG. 2 P. - P, max So ntmin -t Fig.Z