RU2278361C2 - Torquemeter - Google Patents

Abstract

FIELD: the invention refers to instrument-making particular to measuring technique and may be used for measuring of torque moment.

SUBSTANCE: the arrangement has a foundation with a bracket in whose bearings a shaft is installed, and also a measuring block with a scale, a pendulum and an additional counterweight, connected with an indication arrow, and a limiter of movement with possibility of regulating of additional counterweight in height. The foundation is applied in quality of a limiter of the movement of an additional counterweight. The additional counterweight has a hollow thread opening inside which a rod with thread is installed.

EFFECT: simplifies construction of the arrangement.

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 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.

Closest to the proposed are electromagnetic braking torque meters with an additional counterweight and its movement limiter located on the base (application for the invention "Momentomer", G 01 L 3/22, reg. No. 2003136298, publ. 10.06.2004, bull. No. 16) .

However, its design is quite complicated.

The purpose of the invention is to simplify the design.

This goal is achieved by the fact that a base is used as a limiter for the movement of the additional counterweight, and the additional counterweight contains at least one through threaded hole, inside which there is a threaded rod.

Figure 1 shows a momentometer, a General view; figure 2 is a view of a fi.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 with a flange 8 with an electromagnet system 9, pointer 10, an eccentric pendulum counterweight 11, and cam 12.

An additional counterweight is located in the diametral groove of the cam 12 — a flexible thread 13 with a load 14, which has at least one through threaded hole 15 with a threaded rod 16.

The other end of the flexible thread 13 is fixedly mounted on the cam 12 at a point diametrically opposite to the attachment point of the counterweight 11. The load 14 deflects the movable electromagnetic system 9 with the pointer arrow 10 to its original extreme left (right) position. A shaft 18 is connected to the axis 6 by means of a coupling 17, on which it is necessary to measure the torque.

The most commonly used thread in measuring instruments for precision screw pairs is metric (V. Lawnikov, A. N. Malov, A. B. Paknis and others. General Technical Reference, Moscow, Mechanical Engineering, 1982, 415 pp., Ill.).

As threaded rods in specific cases can be applied including

- bolts convenient for use for calibrating wrenches;

- screws, convenient when working with a screwdriver;

- studs, secure fastening with nuts on both ends

the rod.

Momentomer works as follows.

When a torque occurs on the shaft 18, the disk 7 comes into rotation in the magnetic field of the electromagnets 9, the currents inducted 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, the 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 base 1 in the role of the movement limiter of the additional counterweight 14 neutralizes its effect when the index arrow 10 passes the zero reference point and eliminates the "tipping" of the momentometer. When neutralizing the additional counterweight, the pendulum counterweight acts against the "tipping" of the momentum.

Calibration of the momentmeter occurs by screwing (unscrewing) the rod 16 into the threaded hole 15 with fixing in the position corresponding to the zero point of the scale 3.

In the proposed technical solution, the design is simplified, cost is reduced by reducing the number of parts used, namely, the movement limiter of the additional counterweight as such.

In the claimed technical solution, the use of an additional counterweight of the momentum base as a movement limiter is a new feature.

A new feature is the use of threaded rods for calibrating the torque gauge by screwing (twisting) into the threaded holes on an additional counterweight.

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 (5)

1. A torque gauge containing a base with at least one bracket, the bearings of which have a shaft connected to a controlled torque, as well as a measuring unit with a scale, pendulum and additional counterweights associated with the pointer arrow, a movement limiter with the possibility of adjusting an additional counterweight height with fixation in the working position, characterized in that the base is used as a limiter for the movement of the additional counterweight, and the additional counterweight contains, ak least one through threaded hole, within which is mounted a threaded rod. 2. The torque gauge according to claim 1, characterized in that a bolt is used as a threaded rod. 3. The torque gauge according to claim 1, characterized in that a screw is used as a threaded rod. 4. The torque gauge according to claim 1, characterized in that a stud is used as a threaded rod. 5. The torque gauge according to claim 1, characterized in that a metric thread is used in the through hole and on the rod.

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