RU2279648C2 - Pressure gage - Google Patents

Abstract

FIELD: instrument engineering.

SUBSTANCE: device comprises base with cantilever whose bearings receive the shaft, measurement unit with scale, pendulum and additional counterweights connected with the pointer, and arrester of movement of the pendulum counterweight provided with shock-absorber.

EFFECT: enhanced precision and prolonged service life.

4 cl, 2 dwg

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 the brake device installed on the base, which loads the brake engine under test torque, and the measuring unit necessary to measure this moment (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 momentometers with a pendulum counterweight and a limiter of its movement (Application for the invention "Momentomer", G 01 L 3/22, reg. No. 2005103784 of 02/14/2005).

However, during measurements in the upper part of the scale, due to the inertia of the pendulum system, the pendulum counterweight strikes the limiter of its movement, which leads to premature wear of the momentmeter.

The purpose of the invention is to increase the accuracy of measurements, as well as the lifetime.

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

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 moment 1. In the ball bearings of bracket 2, a flange 8 is installed with a system of electromagnets 9, a pointer arrow 10, a pendulum counterweight 11 and a cam 12.

In the diametrical groove of the cam 12 is an additional counterweight - a flexible thread 13 with a load of 14.

On the bracket 15, a limiter of movement 16 of the pendulum counterweight is installed 11. Springs 17 act as a damper at the moment the pendulum counterweight 11 is in contact with the limiter of its movement 16.

The dashed line shows the position of the pendulum counterweight 11 at a maximum angle of rotation of 180 °.

The load 14 deflects the movable electromagnetic system 9 with the pointer arrow 10 to its original extreme left position. A shaft 19 is attached to the axis 6 by means of a coupling 18, on which it is necessary to measure the torque.

Momentomer works as follows.

When a torque occurs on the shaft 19, the disk 7 comes into rotation in the magnetic field of the electromagnets 9. The currents induced in the non-magnetic metal disk 7 interact with the magnetic field of the electromagnet system 9, as a result of which the latter, together with the flange 8, cam 12 and the index arrow 10, are carried away in the direction rotation of the non-magnetic metal disk 7 and stops at a certain angle to the original. During the rotation of the electromagnetic system 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 the additional counterweight 14 remains constant. Only the braking moment created by the pendulum counterweight 11 varies depending on the angle of rotation.

The limiter 16 with the springs 17 softens the impact of the pendulum counterweight 11, prevents its premature destruction.

The spring-loaded limiter 16 withstands a larger impact from the side of the counterweight 11, which allows to increase the scale of the measurement of the momentmeter and thus increase the accuracy of the measurement of torque.

The shock absorber may be pneumatic, in which the shock of the counterweight is mitigated by the resistance of air (gas), or hydraulic, in which liquid is used for damping.

The presence of an electromagnetic system is optional, and the torque can be applied directly to the flange 8. In this case, the torque can be generated both by a mechanical device and by the physical effort of a person, for example, his lower or upper limbs.

Reduces the likelihood of failure of the momentmeter in case of erroneous application of a torque exceeding the range of its measurements, since a sharp blow to the limiter is excluded.

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

In the claimed technical solution, the use of a moment meter to simultaneously increase the life and accuracy of measurements of the pendulum counterweight with the shock absorber is a new feature.

A new feature is the use of the momentum in healthcare and sports.

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 (4)

1. A torque meter containing a base with an arm, in the bearings of which a shaft is connected, connected with a controlled torque, a measuring unit with a pendulum counterweight, and also a pendulum counterweight movement limiter, characterized in that the pendulum counterweight movement limiter is made with a shock absorber. 2. The torque gauge according to claim 1, characterized in that the shock absorber is spring-loaded. 3. The torque gauge according to claim 1, characterized in that the shock absorber is made pneumatic. 4. The torque gauge according to claim 1, characterized in that the shock absorber is made hydraulic.

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