SU1377653A1 - Method of estimating technical condition of agricultural machine mechanism with crank drive - Google Patents

Abstract

The invention relates to the maintenance of agricultural machinery and provides an increase in the information content and reducing the complexity of diagnosis. Two parameters are determined; as one of them, the movement of the connecting rod 3 of the cleaning mechanism along parasitic waves is taken. degree of freedom. This movement is recorded by the amplitude of the signal of the magnetoelectric sensor 4 linear displacement, when the angle between the axes of the crank 2 and the connecting rod 3 is equal to O or I80. As the second parameter, the movement of the slave unit, for example, suspension 7 of the lower register 8, measured by a rheostat sensor 5 of angular displacements, the signal of which is recorded simultaneously with the registration of the signal of the sensor 4, is taken. Sensor 5 can measure angular movements and other driven units of the mechanism. According to the results of comparing the values of the signals received from sensors 4 and 5 with the standard ones, they determine the technical condition of the elements of the cleaning mechanism1 and. 3 il. f with /)

Description

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The invention relates to the maintenance of agricultural machinery and can be used, for example, to determine the technical state of the mechanism for cleaning a combine harvester.

The purpose of the invention is to increase the information content and reduce the complexity of the method.

Fig. 1 shows the layout of displacement sensors when determining the technical state of the mechanism for cleaning combine harvesters; in Fig „2 - an indicator of displacement sensors for a faulty mechanism. H - the same for a worn mechanism.

The method is carried out in a sintering manner.

On the case 1 of cleaning the combine harvester in the plane of the crank 2 (oscillating shaft) and connecting rod 3, a magnetoelectric sensor 4 linear displacements is installed. On the stiffener 1, a rheostat sensor 5 of angular displacements is installed, the slider of which connects the hard 6 to the driven element of the mechanism, for example, the suspension 7 of the lower cleaning sieve 8. Sensor 5 can be swapped across the panel of housing 1, and the slider of this sensor can be connected to slave links 9 and 10.

The method is carried out as follows.

Scrolling manually the pulley of the main counter-drive for cleaning, set the neck of the crank 2 opposite the sensor 4 Between the neck of the crank 2 and the sensor 4 establish a gap of 3.5 mm, characterizing the sensitivity of the sensor 4, while the angle between the axes of the crank 2 and the connecting rod 3 must be equal to O or 180 °

The engine of the combine is started and includes a cleaning mechanism, to assess the technical state of which two parameters are determined. The first parameter — the movement of the connecting rod 3 — is recorded by the amplitude A of the signal from the sensor 4, when the angle between the axes of the crank 2 and the connecting rod 3 is O or 180 °. In this case, the readings of the sensor 4 actually record the movement of the connecting rod 3 in the parasitic degrees of freedom in the hinge couplings of the driving link (crank 2). This movement characterizes the gap in these hinge joints, the magnitude of which determines the technical condition of the mechanism. .

The second parameter — displacement of the driven link of the mechanism — is measured by sensor 5. The amplitude V. of the signal of this sensor is recorded simultaneously with recording of the signal of sensor 4. Sensor 5 records the angle of rotation Cf of the driven link (depending on 7).

Depending on the technical condition of the elements of the mechanism (on the size of the gaps in the hinge conjugations), the amplitudes A and B change (increase as the mechanism wears). The measured amplitudes A and B are compared with the normative values (admittances) and, based on the comparison result, they make a conclusion about the technical state of the mechanism.

This method allows you to measure

the necessary parameters without the use of vibration sensors, which reduces the complexity of the work. In addition, the ability to measure movements of various driven parts of the mechanism is achieved

a simple permutation of the rheostat sensor ensures the informativeness of the method.

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Formula of Invention

A method for evaluating the technical condition of an agricultural machine mechanism with a crank drive, which includes determining two parameters, one of which takes a connecting rod movement recorded by the amplitude of the linear displacement sensor signal and comparing the values of these parameters with standard ones, characterized in that in order to increase the information content and reduce the labor intensity, the signal of the linear displacement sensor is recorded when the angle between the crank axle and the connecting rod axis is O or 180 °, to measure the the rods are rotated according to the parasitic degrees of freedom, and the second parameter is the displacement of the driven link of the mechanism, measured by means of an angular displacement sensor, the signal of which is recorded simultaneously with the registration of the linear displacement sensor signal.

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Claims (1)

Formula <acquisition A method for evaluating the technical condition of the mechanism of an agricultural machine with a crank drive, including determining two parameters, one of which is the connecting rod movement recorded by the amplitude of the linear displacement sensor signal and comparing the values of these parameters with the standard ones, characterized in that, for the purpose to increase the information content and reduce the complexity, the signal of the linear displacement sensor is recorded when the angle between the axes of the crank and connecting rod is 0 or 180 °, for measuring the displacement Ia rod by parasitic degrees of freedom, and as a second parameter taking movement of the driven gear unit, measured by the sensor of angular displacements, which signal is recorded simultaneously with the recording of linear displacement sensor signal.