RU2272263C2 - Momentum meter - Google Patents

Abstract

FIELD: instrument-making industry, in particular, engineering of momentum meters used for measuring torsion torque created on shafts of, for example, electric engines.

SUBSTANCE: momentum meter, containing base with bracket, on bearings of which shaft is positioned, containing base with bracket, in bearings of which shaft is positioned, connected to controlled torsion torque, and also measuring block with pendulum counterweight, contains movement limiter for aforementioned pendulum counterweight.

EFFECT: improved precision of measurements, more stable operation of momentum meter during measurement of torsion torque.

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Description

The invention relates to the instrument industry and can be used to measure torque on continuously rotating shafts, for example, electric motors.

The most common are brake torque meters, which combine a braking device installed on the base, which loads the engine under test with braking torque, and a measuring unit, which is necessary to measure this moment (L. L. Potapov, F. Yuferov, “Measurement of Torques and Rotational Speeds microelectric motors ", M., Energy, 1974).

However, they have low accuracy.

The closest in technical essence to the proposed technical solution are pendulum electromagnetic torque meters with an additional counterweight and a limiter to its movement (Application for the invention "Momentomer", G 01 L 3/22, reg. No. 2003136298, publ. 06/10/2004, bull. No. 16 )

However, in the upper part of the scale, due to the inertia of the pendulum system, the operation of the momentometer is unstable; when measuring the torque, it can “tip over” even if the rotation angle of the system is less than 180 ° in the statics. Reducing the scale range reduces the accuracy of the measurements.

The purpose of the invention is to increase the accuracy of measurements.

This goal is achieved by the fact that the momentometer is made with a limiter of the movement of the pendulum counterweight.

The limiter of the movement of the pendulum counterweight allows increasing the accuracy of measurements, eliminating the "tipping" of the momentmeter during sharp jumps in the measured torque, as well as during measurements in the upper part of the scale (due to the inertia of the system).

Figure 1 shows a momentometer, a General view; figure 2 - a view of figure 1.

Bracket 2 with a scale of 3 and brackets 4 and 5 with a freely rotating axis 6 of a non-magnetic metal disk 7 are fixedly mounted on the base of the momentometer 1. A measuring unit comprising a flange 8 with an electromagnet system 9, a pointer arrow 10, a pendulum counterweight 11, and cam 12.

In the diametrical groove 12 is an additional counterweight - a flexible connection 13 with a counterweight 14.

A limiter of movement 16 of the pendulum counterweight 11 is mounted on the bracket 15. The dashed line shows the position of the pendulum counterweight 11 at a maximum rotation angle of 180 °.

The counterweight 14 deflects the movable system of electromagnets 9 with the pointer arrow 10 to its original leftmost position. A shaft 18 is attached to the axis 6 by means of a coupling 17, on which it is necessary to measure the torque.

Momentomer works as follows.

When a torque occurs on the shaft 18, the non-magnetic metal disk 7 comes into rotation in the magnetic field of the system of electromagnets 9. The currents induced in the non-magnetic metal disk 7 interact with the magnetic field of the system of electromagnets 9, as a result of which the latter together with the flange 8, cam 12 and pointer arrow 10 carried away in the direction of its rotation and stops at a certain angle to the original. When rotating the system of electromagnets 9, rigidly fastened by means of a flange 8 with a cam 12, a flexible connection 13 with a counterweight 14 is wound up on the profile surface of the cam 12.

The braking torque created by counterweight 14 remains constant. Only the braking moment created by the pendulum counterweight 11 varies depending on the angle of rotation.

The limiter of the movement of the pendulum counterweight 16 prevents "tipping" of the momentometer when working with the limiting values of the measured torque, which allows to increase the scale of measurements. Depending on the maximum magnitude of the measured torques and the magnitude of the throws during the measurement process, you can slightly increase or decrease the upper value of the scale used to take readings. To this end, the movement limiter of the pendulum counterweight can be made height-adjustable.

The proposed momentometer can be used in healthcare and in the field of sports to measure the torque created by a person on an exercise bike.

In the claimed technical solution, the use of a pendulum counterweight to limit the measurement accuracy is a new feature.

A new feature is the use of the momentometer in healthcare and in the field of sports, as well as the adjustment of the limiter of the movement of the pendulum counterweight in height, which allows taking into account the nature of the measured torques.

These distinctive features give reason to consider the claimed technical solution to meet the criterion of "novelty", it does not follow explicitly from the achieved level of technology and is industrially applicable.

Claims (2)

1. A torque gauge containing a base with an arm, in the bearings of which a shaft is mounted connected with a controlled torque, as well as a measuring unit with a pendulum counterweight, characterized in that it contains a limiter for the movement of the pendulum counterweight. 2. The torque gauge according to claim 1, characterized in that the limiter of the movement of the pendulum counterweight is made with the possibility of height adjustment.

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