SU1749747A1 - Device for controlling slippage in rolling bearings - Google Patents

Abstract

Use of mechanical engineering The essence of the invention The device provides measurement of the amount of slip in radial bearings in modes corresponding to different ratios of frequency and direction of rotation of the bearing rings, and contains rotational drives of the outer and inner ring of the underhead, ring speed sensors and separator, converters dividers , comparing the device and attack indicator, - the diagnostic mode selection block 3 or

Description

The invention relates to a ball-bearing industry, can be used to assess the technical condition of radial rolling bearings, both in design and in operation.

The purpose of the invention is to improve the quality of diagnostics

Fig. 1 is an electrokinematic block diagram of the device; Fig. 2 is an electrical block diagram of a mode selector unit; Fig. 3 is an electrical block diagram of an indicator, the corresponding circuit of a mode selector block.

The device (FIG. 1) contains a shaft 1 for mounting the bearing 2 under investigation, the first 3 and the second 4 contactless sensors used to measure the rotation speed of the separator and the inner ring of the bearing 2, the outputs of which are connected to the inputs of the first 5 and second 6 dividers, respectively, divider 5 consists of two cascades connected in series, the outputs of which are the second and first outputs of divider 5. The first output of the first divider 5 is connected to the input of the first converter 7 frequency-voltage and the second output second divider b - to the input of the second converter 8 frequency-voltage The outputs of the converter 7 and 8 are connected to the inputs of the first comparison unit 9, the output of which is connected to the first input of the indicator 10 The device also contains series-connected third proximity sensor 11, which serves to measure the rotation speed of the external bearing rings 2, the third divider 12, the third frequency-voltage converter 13 and the second comparing unit 14, in addition the fourth frequency-voltage converter 15, the fourth 16 and the fifth 17 divider the third 18 and fourth 19 comparison blocks, the adder 20 and the slip control mode selection block 21. Moreover, the input of the fourth converter 15 is connected to the second output of the first divider 5, and the output is connected to the input of the fourth divider 16, the output of which is connected to the second input of the second comparative block 14, the output of which is connected to the second input of the indicator 10 The output of the third converter 13 through the fifth divider 17 is connected to the third input of the third

cl

xs

4 b. M

comparing unit 18, the second input of which is connected to the output of the first converter 7, and the output is connected to the combined first inputs of the fourth comparing unit 19 and adder 29, the combined second inputs of which are connected to the output of the second converter 8, the outputs of the adder 20 and the fourth comparing unit 19 are connected respectively to the third and fourth inputs of the indicator 10, the fifth input of which is connected to the first output of the mode selection unit 21, the second and third outputs of which are connected to the shaft rotation drive 22 (i.e., lower bearing ring 2} and to the actuator 32 of rotation of the outer ring of the bearing 2, respectively.

The mode selection unit 21 (FIG. 2) contains two sources 24 and 25 of direct current, four relays 26-29 and eight keys 30-37. Indicator 10 (FIG. 3) contains four keys 30-41, four relays 42-45 and information display device 46.

The device works as follows.

Using the mode selector 21, one of four possible slip control modes is selected, corresponding to the actual operating modes of the radial bearing with the following ratios of rotational frequencies fe and tn of the inner and outer rings of the bearing, respectively: mode 1 - f 0 0; TH 0 - rotation of the inner ring; mode 2 - fa 0; fit Vs 0 - rotation of the outer ring; mode 3 - fB 0; fH 0 - rotation of the rings in one direction; mode 4 - fB 0, t F - rotation of the rings in opposite directions.

In this case, the slip for the radial bearing (taking into account the contact angle a-0) is calculated by the corresponding formulas:

Mode 1 - fcK - fo - fc / Kt; Mode 2 - fcK - fa - fc / K2; Mode 3 - ck fe + fn / Cs - fc / Kt; Mode 4 - fCK fo - Jn / Kz - fc / Ki; where fc is the rotational speed of the separator;

Ki. K2 and Kz - division factors, equal to:

2D

./ ,-. R. + ...

 D-d

where D is the diameter of a circle, through the centers of rolling bodies; d is the diameter of the rolling body,

The diameter D of the circumference of the centers of the rolling bodies and the diameter d of the rolling body are determined from the technical documentation for the bearing.

The selection of the monitoring mode is accomplished by closing one of the keys of the block 21:34, 35, 36, or 37 (FIG. 2).

To select mode 1, the contacts of the switch 34 are closed. When this happens, relay 26 is activated,

0, contacts 30 are closed and power is supplied to a DC source 24, the output of which is connected to the input of the drive 22. The drive 22 causes the inner ring of the bearing 2 to rotate and its outer ring

5, the ring is braked, since the drive 23 is not energized. From the output of the proximity sensors 3 and 4, signals proportional to the rotational frequencies of the separator and the inner ring are supplied

0 to the first stage divider 5 and divider b with division factors equal to the transmission coefficients of the proximity sensors 3 and 4, respectively. In addition, the signal from sensor 3 in the first stage divider 5

5 is divided by the coefficient KL taking into account the geometrical parameters of the bearing under study. The output signals from the first output of divider 5 and divider b are interrupted using converters 7 and 8

0 are analog and are fed to the inputs of the comparing unit 9. The output signal of the block 9 corresponds to the slip value gsl.

From the key 34, the low voltage is supplied through the first output of the mode selector 21 and the fifth input of the indicator 10 to the relay 42 (FIG. 3), which leads to the output of the comparison unit 9 to the input of the information display device 46 via closed contacts 38 and the fCK slip value display.

To control the slip in mode 2, they close the contacts of the key 35 of the mode selection unit 21. In this case, the relay 27 is activated, the contacts 31 are closed and the supply voltage is applied to the DC source 25, the output of which is connected to the input of the drive 23. The drive 23 causes the outer ring of the bearing to rotate. Its inner ring is blocked since the power to drive 22 is not energized. From the output of the proximity sensors 3 and 11, signals proportional to the rotational frequencies of the separator and the outer ring are fed to the first cascade of divider 5 l f 5 and divider 12 with division factors equal to the transfer coefficients of the corresponding proximity sensors 3 and 11. The output signals from the second output of the divider 5 and the divider 12 is converted using converters 15 and 13 into analog, and the output signal of the converter 15 is divided in divider 16 by the coefficient Kg and fed to the second input of the comparison unit 1G to the first input of which a signal is given from the output of the converter 13. The output signal of the comparison unit 14 corresponds to the slip value f ". From the switch 35, the low level voltage through the first output of the mode selection unit 21 and the fifth input of the indicator 10 is supplied to the relay 43. As a result, the output signal of the comparison unit 14 is fed to the input of the information display device 46 through the closed contacts 39 and is displayed

To select mode 3, the contacts of the key 36 of the mode selection unit 21 are closed. This triggers relay 2B and contacts 32 close, which triggers relay 26 and 27 and energizes the inputs of the DC sources 24 and 25 whose outputs are connected to the drives 22 and 23 respectively. Drives 22 and 23 cause the bearing and outer bearing rings to rotate in one direction.

At the same time, as in modes 1 and 2, the outputs of dividers 5, 6 and 12 contain signals corresponding to the rotational frequencies of the separator, the inner and outer rings of the bearing 2 Output signals from the first stage of the divider 5 and converter 13 are fed to the second stage of the divider 5 and divider 17 that produce the division of the input signals, respectively, by the coefficients Ni and Kz, taking into account the geometrical parameters of the bearing under study. The output signal from the first output of the divider 5 is converted in the converter 7 to analog. The output signal of the divider 17 is supplied to the first input of the comparing unit 18. The second input of which is supplied by the signal e of the converter 7, and the output signal of the comparing unit 18 is fed to the second input of the adder 20 to the first input of which the signal from the output of the converter 8C of the key 36 is supplied is low level through the first output the mode selection unit 21 and the fifth input of the indicator 10 to the relay 44, which closes the contacts 40, and the output signal of the adder 20 is fed to the input of the information display device 46, which reflects the amount of slip TCK

To select mode 4, the contacts of the key 37 of the control mode selection block 21 are closed. At the same time, the relay 29 and the contacts of the key 33 close, which causes the relay 26 and 27 to operate and the supply voltage to the inputs of the sources 24

and 25 DC, the outputs of which are connected to the drives 22 and 23, respectively. When the closure of the second normally open contacts of the relay 29 occurs

5 switching the polarity of the load feeding the actuator 23, which causes the inner and outer rings of the bearing to rotate in opposite directions.

10 Mode 4 is similar to mode 3 and is characterized in that the output signal of the comparison unit 18 is fed to the first input of the comparison unit 19, to the second input of which is fed to the output signal of the transducer 8

From the key 37, a low level signal is supplied via the first output of the block 21 and the fifth input of the indicator 10 to the relay 45, which closes the contacts 41 and the output signal of the comparative 1 of the block 19 is fed to the input of the information display 46 on which the slip value fCK is displayed

Claims (1)

5 claims A device for controlling sliding in rolling bearings, containing a rotational drive for an inner bearing ring, contactless rotational speed sensors 0 of the separator and the inner ring of the bearing, the output of the first of which is connected through serially connected first divider, first converter and first comparison unit to the first input of the indi catator, and the output of the second sensor through serially connected second divider, second converter connected to the second input of the first comparison unit, About the fact that, in order to improve the quality of diagnostics, a rotational drive of the outer ring of the bearing, connected in series by the third contactless first sensor, a third divider third transducer and a second 5 comparator unit, the fourth converter in series, and the fourth divider, the fifth divider in series, the third and fourth comparison blocks, and also the adder 0 and a mode selection unit, the input of the fourth converter is connected to the second output of the first divider, and the output of the fourth divider is connected to the second input of the second divider, the output of the first converter is connected to the second input of the indicator; the converter - with the second input of the third comparison unit, the output of which is also connected to the first input of the adder, the output of the second converter is connected to the second inputs of the adder and the fourth comparison unit, the outputs of which By connecting respectively to third and fourth inputs of the indicator, a fifth input of which connected to the first output of the mode selection unit by the second and third outputs connected respectively to the rotational drives of the inner and outer rings of the bearing. , - 20 JP / I / FIG.