SU98093A1 - Induction logometric torque meter - Google Patents

Description

The invention relates to the number of instruments used to determine the static and dynamic friction moments, for example, in bearings, as well as the torques of small instrument motors, in which the moment is measured using an induction gauge.

A feature of the proposed design is that the balancing of the measured torque is performed using an adjustable establishing ratiometric moment with a constant ratio of currents in the area of the gauge and the use of two scales, the reference and zero.

The drawing is a schematic diagram of the device.

To measure the frictional moment, for example, the instrument bearing 1, the latter is inserted with its outer sleeve into the slot of the rotating pulley 2, which is driven by the motor 3.

The inner bearing race through the compensator 4 and the rod 5 is connected with a hollow cylinder 6 made of red copper sheet.

The hollow cylinder 6 has the ability to rotate around its axis.

Around the cylinder are four, mounted on the cores 7 and 5 of electrical steel. The coils 9 vi 10 are powered by a special transformer //, and, as for the rest of the circuit elements, the principle of connecting the coils of the induction meter is used. The lower end of the rod 5 carries a replaceable partitioned load 12, having the form of articulated thin-walled steel cylinders of small diameter (to reduce the DM) with lead fill. Loads can be selected depending on the required loading.

The balancing of the moment which enthralls the inner ring of the bearing during rotation of the outer ring and corresponding to the measured friction moment is produced by a ratiometric setting moment, the value of which can be changed using two rheochords-13 potentiometers 13 and 14. and connected in series with the winding of coils 9 10 b of the power supply circuit in such a way that

the ratio of the currents in both contacts remains unchanged due to the profile of the reichords and the interrelated movement of the sliders, to which the pointer 15 of the pointer scale 16 is connected.

Potentiometer 13 serves to change the current in the circuit of the coils 10, creating, their countermeasure moment of the meter, and potentiometer 14- to change the current in the circuit of the coils 9 of the torque.

Thus, the position of the lever 17 associated with the sliders 18 and 19 and the arrow 20 determines the magnitude of the setting moment, and the arrow 20 placed on the lever 17 determines on the scale 21 the value of the sought moment in g / cm. To change the power measurement limits, the device is switched to the appropriate voltage by means of the switch 22.

To eliminate the effect of changing the parameters of the power supply, the initial position of the device is at a point close to a ratiometric zero. The equality of the ratiometric setting moment to the moment being measured is determined using the second arrow 15 associated with the frame 6 and the displaced torque.

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Subject invention

Induction logometric torque meter, designed, for example, to determine the torque of instrument bearings and torque of small instrument motors, using a ferrodynamic logometer, the frame of which is kinematically associated with the test object, two scale reading and zero and electrical contact devices for determining the moment of displacement arrows and for adjusting the position of the core during installation, which is also distinguished by the fact that, in order to balance the measured moment by the log with the etric moment, From the change in power supply parameters, the working section of the device is in the zone close to the ratiometric zero, and both coils of the gauge are connected to the power source through the appropriate calibrated plates, which ensure the current ratio remains constant and change the value of the ratiometric moment to which achieves the equality of both moments, is determined by the movement of the zero arrow associated with the barometer.