SU1662403A1 - Device for diagnosing of grain combine straw shaker - Google Patents

Abstract

The invention relates to agricultural machinery, namely, devices for diagnosing the technical condition of the working mechanisms of combine harvesters. The aim of the invention is to improve the accuracy of the control. The device contains a magnetoelectric sensor 1 for registering a selection of the buttons of the straw walker, a vibrator 4, amplifiers 6 and 7, a differential amplifier 10, a switching element 11, an indication unit 12, a timer 13. During the operation of the straw walker mechanism, its bearing supports perceive all the dynamic effects occurring in the unit, the oscillations generated are recorded by the vibrator 4, the generated signal is amplified by amplifier 6, equalized in amplitude and phase in the scaling unit 8, signals are sent to the differential amplifier 10. Simultaneously from the second channel connection, which is formed by pulses from the magnetoelectric sensor 1, amplified by amplifier 7, the amplitude and phase equalized in block 8 scaling signals are also tread to the differential amplifier 10. The subtraction in the differential amplifier 10 in amplitude signals through the member 11 running on command timer 13 time are applied to the display unit 12 where, for example, in chetyrehrazr bottom limit of the measurement is performed count readings. Depending on the magnitude of the latter, the condition of the straw walkers is judged. 1 hp ff, 4 ill.

Description

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The invention relates to agricultural machinery, namely, devices for diagnosing the technical condition of the working mechanisms of combine harvesters.

The purpose of the invention is to improve the accuracy of control.

FIG. 1 shows a block diagram of a device for assessing the technical condition of the straw walker of combine harvesters; in fig. 2 - working diagram of the installation of sensors on the case of the straw walker mechanism; in fig. 3 - node I in FIG. 2; Fig. 4 shows a plot of the implementation of subtracting signals by electronic units of the circuit.

The device contains a magnetoelectric sensor 1 for registering a knockout of the straw walker, mounted on the front panel of the thresher housing by means of an adjustable bracket 2 in the rotational-translational movement zone of the straw walker 3. Vibrating transducer A for detecting the straw shaft 3 is located on the stud of the bearing shaft of the straw walker. The output of the vibration converter 4 and the sensor 1 is connected to the corresponding differential inputs by means of the corresponding amplifiers 6 and 7, as well as blocks 8 and 9. cial amplifier 10. The output of the last using the dial member 11 connected to the input unit 12, display, and input to a controllable element 11 connected to the timer 13 times. The latter is made in the form of a sensor for detecting the phase of oscillation of the shaft of the straw walker 3, for example, in the form of an induction sensor.

The device works as follows.

During the operation of the straw walker mechanism, its bearing supports perceive all the dynamic effects occurring in the unit. The resulting oscillations are recorded by the vibration transducer 4, the generated signal is amplified by an amplifier 6, equalized in amplitude and phase in the scaling unit 9, the signals are sent to a differential amplifier 10. Simultaneously from the second communication channel, which is generated by pulses from a magnetoelectric sensor 1, amplified by an amplifier 7, equalized in amplitude and the phase in the scaling unit 8, the signals are also fed to the differential amplifier 10, the signals deducted from the differential amplifier 10 in amplitude through element 11, working on the timer command 13 time, arrive at the display unit 12, where, for example, the four-bit limit of the measurement limit reads out.

After turning on the straw walker mechanism 3 and at the beginning of work, the radial clearance, for example, is 0.16 mm, in the key bearings 0.5-1.2 mm, the bend of the shafts is 0.12 mm,

the deformation of the keys is within 1-3 mm; with such parameters, the runout of the keys in the horizontal-angular direction is equal to fi 40 mm; the magnitude of the signal marked from the display unit 12 should be

100 TV.

During operation of the combine harvesters, the values of the parameters of the technical condition of the straw walker 3 increase. The radial clearance in the thrust bearings reaches its maximum permissible values of 0.20 mm, the gaps in the key bearings 1-8 mm, the bending of the shafts 0.3 mm, the deformation of the keys is 3-6 mm, the stick out reaches

h 20 mm. The signal from the display unit 12 to a value of 220 mV. Thus, the mark from the display unit is set to 100 mV - Normal, 220 mV. Not normal. A further increase in the parameters of the technical condition of the straw trough 3 causes a breakdown of the entire unit.

Claims (2)

1. Device for assessing the technical condition of grain harvesting straws combine, containing a magnetoelectric sensor for recording the departure of the buttons of the straw walker, connected to the input of the first converter, vibration converter To register the contact of the straw walker connected to the input of the second converter, as well as the display unit, characterized in that, in order to improve the control accuracy, it is equipped with a timer, a switching element and a differential amplifier, each converter made in the form of a series-connected amplifier and block scaling, with the outputs both scaling units are connected to the corresponding inputs of the differential amplifier, and the output of the latter. connected to the information input of the switching element, to the control input the output of the timer is connected, and the output is connected with the display unit, in addition, the magnetoelectric sensor is configured to register the departure of the straw walker keys in perpendicular directions in the vertical plane. 2. The device according to claim 1, which differs from ° C in that the timer is designed as a sensor for detecting the phase of oscillation of the straw of the straw walker. FIG. t Vui.3