SU1670520A1 - Device for testing materials for lubricated friction and wear - Google Patents

Abstract

This invention relates to friction and wear testing systems for materials. The purpose of the invention is to provide automated control of the testing process and increase the reliability of measurement of friction parameters. The device contains sensors for friction and temperature parameters, a temperature sensor connected to a comparator unit connected to a temperature setter, an indicator and a temperature controller controlling a heating element. For adjustment to a predetermined test time, the comparison unit is connected to a trigger, a time counter, and a time setter. After the set temperature has been set, the control unit energizes the rotational drive, wear sensors, friction contact conductivity coefficient, frictional force, and also stops the testing device and recording devices in time. In order to ensure simultaneous activation of the recording devices after application of the load to the test specimens, the device is equipped with a blocking device. 1 il.

Description

The invention relates to a testing technique and can be used to control devices for testing rubbing materials and oils.

The aim of the invention is to provide the possibility of automated control of the testing process and improving the reliability of measuring the parameters of friction by maintaining the stability of the conditions of friction.

The drawing schematically shows the proposed device

The device contains a power supply unit 1 connected to one input of control unit 2 and an input of temperature controller 3 connected with a heating element 4

and with the output of the comparison unit 5, the temperature sensor 6 connected to one input of the comparison unit 5 connected to the second input to the temperature setting 7, and the outputs to the indicator 8 and to the first input of the trigger 9 whose output is connected to one input of the time counter 10 connected to inputs with a time setting 11 and with one output of block 12, and outputs with a second trigger input 9 and a second input of control block 2 Control block 2 is connected to the output of the block 12 of the test device with the input of the block 12, the sensor 14 frictional forces, wear a sensor 15 and sensor 16 Elektroprom factor XI

ABOUT

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water friction contact. Each of the sensors 14, 15, 16 is connected by an output to an input of a corresponding recording device 17, 18, 19, respectively, each connected by a second input to an output of block 12.

The device also includes an oil bath 20 with test oil 21 and counterbrack holders 22 and samples 23.

The device works as follows.

Before starting the test, it is necessary to pour test oil 21 into the bath 20. Set the temperature and the time of testing using the setting units 7 and 11. After these operations have been completed, the device is ready for operation.

Initially, the control system works on heating the test oil. For this, power supply unit 1 is turned on, voltage is supplied to control unit 2 and controller 3, which turns on heating element 4. The test oil 21 is heated to a predetermined value set by the temperature setting device 7. The temperature of the oil 21 is measured by a temperature sensor 6 placed in the oil 21, and its value is compared in block 5. When the oil temperature is below the set temperature, the temperature indicator lamp 8 lights up. When the temperature reaches a predetermined temperature, the indicator lamp 8 goes out, and from the comparison unit 5 a signal is given to the trigger 9, which in turn generates a start signal of the pulse generator of the time counter 10, which enters the control unit 2 through the latter. The control unit 2 supplies the voltage to the sensors 14, 15, 16 for measuring the moment of frictional force, wear, conductivity coefficient of the friction contact and the rotation drive 13.

From the moment the sample 22 begins to rotate in the device, the control system works to heat the sample 22 without applying a load to the specified oil temperature 21. When the sample 22 rotates in the oil bath 20, the oil gives heat to the sample 22 and as a result the oil temperature 21 drops. The indicator light 8 lights up and goes out when the set temperature is reached. After the secondary set of the predetermined temperature of the oil 21, a load is applied to the test samples 22, 23. Since then, the system has been working on the registration of tribological parameters and control of the testing process. In this case, the blocking unit 12 supplies the voltage to the recording devices 17, 18, 19 and the signal to the time counter tO for counting the test time. In the process

the tribotechnical parameters are recorded on the recording devices 17, 18, 19. The signals from the sensors 14, 15, 16 may not be sent to the recording devices.

devices 17, 18, 19, and through a microprocessor on a micro-computer and immediately processed by a special program.

After the test time specified by the setting device 11, the counter 10

0 time generates a signal, upon receipt of which the control unit 2 generates a signal for turning off the rotational drive 13, de-energizing the sensors 14, 15, 16, recording devices 17, 18, 19 and returning

5 trigger 9 to its original state. The operator turns off the power supply unit 1.

After changing the oil 21 in the bath 20 and the test samples 22, 23, the process is repeated.

Claims (1)

Formula of invention A device for testing materials in the presence of oils for friction and wear, containing a base, an oil bath installed on it, and accommodated therein 5 sample holders, a rotation drive, kinematically associated counterbrack holder, a loading unit connected to the sample holders, and friction torque and temperature sensors, from and that so as to ensure automated control of the testing process and increase reliability of results, it is equipped with a power supply unit, a temperature setter, a unit of comparison, with the inputs of which the output of the temperature setter and the temperature sensor are connected, with an indicator connected to one output of the comparison unit, A temperature monitor connected to one output of the power supply unit, a heater connected to a temperature controller, a trigger, one input of which is connected to the second output of the comparison unit, a time counter, one input of which is connected 5 with a trigger output, and an output with a second trigger input, a time master, a control unit, one input of which is connected to the output of a time counter, a blocking unit, the output of which is connected to 0 by the third time counter input, wear and conductivity sensors of the friction contact, connected to the output of the control unit, by recorders, with one input connected respectively to 5 sensors of frictional force, wear and conductivity of the friction contact, and the second inputs with the second output of the control unit, the second input of the control unit is connected to the second output of the power supply unit, the output of the control unit is connected with the blocking input, the rotation drive and the friction torque sensor, and the third output of the comparator unit is connected to the temperature controller -AND L