SU540186A1 - Device for diagnostics rolling bearings - Google Patents

Description

one

This invention relates to a testing technique.

A device for diagnostics of rolling bearings is known, which contains a vibration converter, an amplifier, a frequency analyzer, a counter, a matrix decoder, a coincidence unit, a memory unit, an adder, a threshold unit, and a digital converter pointer, with one of the outputs of the frequency analyzer connected to one of the match block inputs 1.

However, this device does not allow diagnostics of defects in rolling bearings installed in products, since it is impossible with its help to take into account changes in the frequency spectrum of vibration caused by the design of products.

The proposed device differs from the known one in that it is provided with a series-connected mode switch, a unit for determining the probability of a bearing defect, a unit for inputting the probability of a defect, and a synchronizer. The input of the mode switch is connected to the output of the coincidence unit, and the outputs of this switch are connected to the input of the storage unit and the bearing defect probability determination unit, the output of the defect probability input unit is connected to the second input of the adder, and the synchronizer outputs are connected to the second input of the frequency analyzer and with the entrance of the counter. In addition, the second output of the matrix decoder is connected to the second input of the threshold unit. Such an embodiment of the device allows one to take into account changes in the vibration spectrum of bearings that occur during their work in the product, due to which it is possible to diagnose bearing defects installed in the products. In addition, it provides improved performance.

The drawing shows a block diagram of the proposed device. A device for diagnostics of rolling bearing defects contains a vibration converter 1, an amplifier 2, a frequency analyzer 3, a synchronizer 4, a counter 5, a matrix decoder 6, a coincidence unit 7, a mode switch 8, a unit 9 for determining the probability of a defect in a bearing, a unit 10 for entering the probability of a defect, a storage unit 11, an adder 12, a threshold unit 13 and a digital converter-pointer 14. Block 9 for determining the probability of a defect

the bearing determines the significance of the information frequency, i.e. the frequency of non-drying information about a specific type of defect. Each type of defect is characterized by several information frequencies. Defect probability input unit 10

the bearing introduces definite weight factors into the adder 12, using which the adder determines the value of a discrete function, by the sign of which the occurrence of a certain type of defect in the bearing is established.

The device works as follows.

The vibration converter 1 converts the vibrations of the diagnosed bearing unit into an electrical signal, which, amplified by amplifier 2, is fed to frequency analyzer 3. The frequency analyzer is tuned by tuning motor, input w, to synchronizer 4. At the same time, synchronizer 4 outputs a synchronizing pulse to counter 5.

The status information of the counter 5 is fed to a matrix decoder 6, on the dial field of which certain theoretical information frequencies are set.

The signal from the matrix decoder 6 enters the coincidence unit 7 in the case when the spectrum analyzer 3 is tuned to one of the information frequencies. Each bus of the matrix decoder 6 corresponding to a certain information frequency is connected to its own circuit in coincidence unit 7. At the second inputs of the coincidence circuits, the frequency analyzer 3 receives a signal proportional to the vibration amplitude of the studied bearing at the frequency of the spectrum analyzer.

At the simultaneous occurrence of signals at both inputs of the coincidence unit 7, an impulse appears, which via the mode switch being in the recognition position enters the storage unit 11. In the presence of vibration with a certain information frequency, the key corresponding to this frequency, and the corresponding input of the adder 12 is connected to a single voltage. Adder 12 calculates the value of the discriminant function.

The values of the weighting coefficients of the information frequencies are determined in the block 9 for determining the probability of a bearing defect and are entered into the adder 12 when the device is operating in the mode of learning by the unit 10 to enter the probability of a bearing defect. Voltage from adder 12 whose sign matches

the sign of the discriminant function enters the threshold unit 13, in which the occurrence or absence of a defect in the bearing under test is established.

The second input of the threshold unit 13 at the end of the analysis comes from the readout bus of the matrix decoder 6 read pulse. If a pulse appears at the end of the analysis at the input of the threshold unit 13, then it records on the digital converter-pointer 14 the presence of this type of defect in the bearing under study.

In the training mode, the vibrator 1 converts the vibration of a reference bearing with technological defects or defects in the assembly of the bearing assembly. The operation of the amplifier 2, the frequency analyzer 3, the synchronizer 4, the counter 5, the matrix decoder 6 and the coincidence block 7 is similar to their operation in the recognition mode.

Claims (1)

Invention Formula Bearing diagnosis device a roller containing a vibrator, an amplifier, a frequency analyzer, a counter, a matrix decoder, a coincidence unit, a storage unit, an adder, a threshold unit and a digital converter pointer, with This is one of the outputs of the frequency analyzer connected to one of the inputs of the coincidence unit, characterized in that, in order to ensure the possibility of performing diagnostics of defects in subspaces installed in products and speeding up, the device is equipped with a series-connected mode switch, a bearing defect probability determination unit, a defect probability input unit and a synchronizer, the mode switch input is connected to the output of the coincidence unit, and the outputs of this switch are connected to the memory block inputs and a unit for determining the likelihood of a bearing defect, the output of the input unit for the likelihood of a defect is connected to the second input of the adder, and the outputs of the synchronizer are connected to the second the input of the frequency analyzer and the counter input, in addition, the second output of the matrix decoder is connected to the second input of the threshold unit.