SU111492A1 - Lubricating oil quality testing machine - Google Patents

Description

The known machines and devices for testing the quality of lubricating oils have mechanical loading units, imitating, and operating conditions; In these machines, the angles of rotation of the tiller are determined mechanically.

In the described machine, for the purpose of testing lubricating oils, in order to more accurately determine the quality of lubrication of oils by electrical measurement from the angle of deviation of the pilot, the lower half of the bearing of the loading device is made in the form of a frame with a core, the arrival of a ball from the electromagnetic coil on the tomb and connected to the steel plate, the entrance is w, with its ends into the induction resistance coils of the AC bridge.

FIG. Figures 1 and 2 show the design of the lubricant testing machine: The shaft / may vrach, be at a certain speed in the bearing, which consists of two halves 2 VL 3. The upper half of the 2 bearings freely rest on the shaft /, and the massive master 4 is suspended from it The state of two poles of the supports 5 and the electromagnet 6 was ush, its main weight of the tandem. The lower half of the bearing is connected to two legs 7 that can slide along the supports 5. The legs 7 are one complete rigid system with a base 8 and a core 9. The supports 10 serve to limit the travel of this system. When current is passed through the electromagnet 6, the core 9 is pushed up by the action of the magnetic field and presses the lower half bearing 3 to the shaft /. Meng current in electromagnet 6, you can set the required load on the bearing.

An electrical device included in an electromagnet circuit can be calibrated in units of force, characterizing their load on the shaft bearing.

Before testing, the shaft is lubricated with the test oil. For the continuous supply of oil to the shaft / serves oiler. Val 1 is driven

No. 111492-2 -

in rotation with a motor with an adjustable speed. Occurs when the shaft moves / the force of friction depends on the number of revolutions of the shaft per minute, on the load on the support and on the quality of the lubricant.

The friction force F is directed towards the rotation of the shaft /, tangentially to the shaft surface, and the bearing 2 and 5 under the action of the friction forces tend to shift towards the movement of the shaft /, and with it the whole of the pilot system with an electromagnet. The friction force F depends on the force P, with which the bearing 3 is pressed against the shaft 1 by the electromagnet 6, on the weight of the entire system — the tang 4 and on the quality of the lubricant expressed by the coefficient K.

Comparing the quality of lubrication of different oils at the same speed of the motor of the machine and at the same pressure in the bearing, we find that the quality of the lubricant can be estimated by the angle of rotation of the tandem 4. The greater the angle of rotation of the tandem 4, the lower the lubrication quality.

To read the angle of rotation of the tandem, an ac bridge circuit is used, consisting of the following elements.

At the end of the core 9 there is a reinforced steel plate // symmetrically located with respect to the two coils 12 of the AC bridge. Two ohmic resistances (one of which is adjustable) are also included in the bridge circuit. When the tambour is in the non-deflected position, the steel plate 11 enters to the same depth in both coils 12, whereby the inductive resistance of these coils is equal.

With the deviation of the tambour at an angle a, the location of the plate // changes. It enters a large length of one coil and partially comes out of another coil. Due to this, the inductive impedance of the coils changes and the balance in the bridge is broken. When the bridge is unbalanced, the galvanometer will give a deviation, which will be greater, the greater will be the deviation of the plate // from the initial zero position, i.e. the greater will be the angle a,

Electromagnetic loading on the shaft bearing and electric bridge for determining the turning angle of the master body provide the necessary accuracy and flexibility in determining the qualities of lubricating oils.

Subject invention

A machine for testing the quality of lubricating oils, consisting of a rotating shaft lubricated by test oil, a loading device made in the form of detachable bearing halves and fixed devices, characterized in that, in order to more accurately determine the quality of lubrication of oils by electric measurement of the angle of deviation the tick, the lower half of the load-bearing device is made in the form of a frame with a core coming in motion From an electromagnetic coil placed on the tiller and connected to a steel plate Tink, incoming at its ends in kaTuschki induction AC resistance bridge