SU805084A2 - Device for measuring shaft twist angle - Google Patents

Description

one

The invention relates to force-measuring technology and can be used for contactless measurement of the angle of torsion of a shaft.

According to the main author's certificate No. 735938, it is known to measure the angle of twist of a shaft, which contains inductive transducers located in two controlled shaft sections with switching circuits of windings crammed from a generator, and measuring circuit 1.

However, this device is characterized by low measurement accuracy due to the presence of dips in the sum signal of the transducers.

The purpose of the invention is to improve the measurement accuracy.

This goal is achieved by introducing a third inductive transducer with a winding connection circuit into the measuring circuit powered from a generator, located at the same distance between the first and second transducer. The measuring circuit is made in the form of three summation blocks, with the inputs of the first block connected with the outputs of the switching circuit of the first and

The third transducer, the inputs, the second transducer with the output circuits of the second and third transducers, and the third summation unit is connected with its inputs with the outputs of the first and second summation units.

FIG. 1 shows a block diagram of the device; in fig. 2 - sweeps of sections (sections) of the shaft with wiring layers (to the right of the sweeps, the relative position of the ends of the inductive converters is shown with the shaft twisted); in fig. 3 - shaft and inductive converters, side view; on fkg. 4 combining the scanning of the electrically conductive layer and the poles of the inductive converters; FIG. 5 - signals, timing diagrams.

Angle measuring device

0 shaft tightening includes inductive converters 1 and 1, 2 and 2 and 3 and 3 (Fig. 1), the switching circuits of the windings of converters 4-6,. powered by generator 7,

Claims (1)

5 and a measuring circuit in the form of three summation blocks 8-10, with the output of the last block connected to a voltmeter V. Inductive converters also include electrically conductive layers 11 through 13, carried over three sections of the shaft 14. The Eokov scan of the profiled poles of the transducers is represented It is an isosceles triangle (Fig. 4) and their ends are made along an arc of a circle (Fig. 3), and the width of the poles is less than the width of the electrically conductive layers 11, 12 and 13 (Fig. 4) by the amount of possible zero shaft displacement, the length of the poles ho de is equal to the extension of the conductive layers along the chord (FIG. 2) and the extent of the coated and uncoated portions of the shaft on the same circular arc. Inductive devices 1 and 1 and 2 and 2 are located at the same distance from the central converter 3 and 3. The device operates as follows. When the shaft rotates, the total areas of the gaps between the conductive layers 11-13 and the poles of the inductive converters 1 and 1, 2 and 2 and 3 and 3 change according to a triangular law (Lig. 1 and 5), this change is converted into an electrical signal by inductive converters 1i1, 2i2iZiZ and their switching circuits 4-6, which are pithots from a common generator 7. The total areas Sj are made up of, 5, and S / 1 (Fig. 2), TeSj., - S + 5c. Other electrical signals from the output of switching circuits: converters 1 and 1.2, 2, and D3Z are fed to algebraic adders 8 and 9, where their proceeds subtraction Vj V - Vj Vy - v (. Figure 1), then these signals are supplied to an adder 10 where they are addition (addition of like voltage sources in parallel their inclusion). If there is no load on the shaft, the signal at the output of the adder 10 is absent. When a load appears, the shaft is twisted — and, therefore, the signals c. The switching circuits of the V4, V J and V transducers are fed to algebraic adders shifted by the magnitude of the relative displacement of the electrically conductive layers. At the output of the adder 8 and 9, the signals Ve and Vq of the trapez Lalma appear. The amplitudes of these signals are the same and will depend only on the magnitude of the shaft twist angle and will not depend on the angle of inclination of the forming profiled poles of the transducers, as well as on the frequency of the signals following ((ig. 5). Then these signals are summed by the adder 10 and its output The signal is proportional to the amplitude of the signals Vg, Vg, and the signals in the output signal of the adder 10 will be absent when adding the signals Vg and V9. Then the signal (recorded by a voltmeter. Invention formula The head of the shaft tightening according to the author's certificate No. 735938, characterized in that, in order to improve the measurement accuracy, a third inductive converter with a circuit for switching the windings into the measuring circuit, powered from the generator, located at the same distance between the first and second converters, was introduced into it and the measuring circuit is made in the form of three summation blocks, with the inputs of the first block. associated with the outputs of the switching circuits of the first and third converters, the inputs of the second with the outputs of the switching circuits of the second and the third transducer, and the third summation unit is connected with its inputs with the outputs of the first and second summation units. Sources of information taken into account during the examination 1. USSR author's certificate W 735938, cl. G 01 L 3/10, 03/17/78. fc /