SU553490A1 - Torque measuring device - Google Patents

Description

one

The invention relates to a force-measuring technique and can be used in measuring the torsional moment of its torque on rotating shafts, for example, marine engines.

The known devices for measuring torque on shafts containing an inductive displacement transducer and a shaft twist transducer into axial movement of the inductive transducer core are not completely non-contact, and therefore are complex in design and have low operational reliability and a limited range of application in the area of low and medium turns.

A device for measuring torque is also known, comprising an inductive displacement transducer, the bark of which is connected to a rotating shaft, and the magnetic circuit with the windings is fixed relative to the shaft, and a mechanism for converting the shaft to twisting into an axial movement of the core. The drawback of the device is the complexity of its design, unreliability and limited range of application.

In the proposed device for measuring torque, the measles are made in the form of two rings fixed on the disks of the mechanism for converting the twist to axial movement of the core, one of which is rigidly fixed on the shaft and the other with the possibility of axial movement. The inductive transducer magnetic circuit is made in the form of two ferromagnetic rods with windings fixedly mounted along the shaft axis without mechanical contact with the core rings and projecting their ends beyond the outer periphery of the rings by the amount of possible axial movement of the shaft. In this case, the ferromagnetic rods and the zone of movement of the rings of the cores are made of a material with a large magnetic resistance, for example

carbonyl iron.

The drawing shows the proposed device.

The device for measuring the torque contains a mechanism for converting the shaft twisting into an axial movement of the core consisting of two disks 1, one of which is rigidly mounted on the shaft 2 and the other movable along the axis of the shaft, and a conversion device 3 made, for example , in the form of a roller-cam mechanism, which is mechanically associated with the said discs. The anchor is designed to control the magnetic flux M created by the inductive transducer, and consists of two rings 4, which are rigidly mounted on the disks 1. The rings 4 are made of electrical steel with low magnetic resistance. Inductive Transform C | - L - «|| P i

... ,,. 4 | ь /

The tel is designed to convert the mechanical movement of the core into an electrical signal and consists of two ferromagnetic rods 5 installed along the shaft axis so that between the rings 1 and the sterols {and 5, one of which, for example, has a magnetizing winding b, and the other is a signal winding 7, which can be inserted into one of the measuring bridge, there is a gap, and the ends of these rods protrude beyond the broken periphery of the rings 4 by the amount of possible axial movement of the shaft 2. Rods 5 in the zone of movement Lets 4 are made of a material with high magnetic resistance (for example, carbonyl iron). The rest of the rods 5 are made of electrical steel with low magnetic resistance. Therefore, the magnitude of the magnetic resistance of the sensor is determined mainly by the sum of the resistances of the air gaps between the sterles 5 and the corresponding rings 4 and the sections of the rods 5 (the zone of movement of the rings 4) made of a material with high magnetic resistance, the total magnetic resistance of which can be greater part of the magnggnogo resistance dapchika. Moving one ring of the core relative to the other significantly changes the magnitude of the magnetic resistance of the sensor, which leads to imbalance of the measuring bridge, the output of which produces a voltage that propagates relative to the relative movement of the rings of the core.

In the absence of a torque, the measuring bridge is balanced, and its output voltage is zero.

In the presence of a torque, the shaft 2 is twisted and the disks I are turned relative to each other at a certain angle, which the device 3 transforms into axial non-movement of one ring core relative to the other. As a result, the distance between these rings changes and, consequently, the magnitude of the magnetic resistance of the sensor changes. Balance measuring bridge 553490

collapses and a voltage is generated at its output, which is measured by the measured moment. During axial movement of the shaft, the rings 4 move along the axis of the shaft by an amount

its axial displacement, with the distance

between them remains constant. therefore

voltage at the output of the measuring bridge

does not depend on axial movement of the shaft.

Offered torque sensor

is non-contact and simplifies the device, at the same time increases operational reliability and expands the range of its application.

Claims (2)

1. A device for measuring torque, containing an inductive displacement transducer, the bore of which is connected to the rotating shaft, and the magnetic circuit with the windings is fixed relative to the shaft, and the twisting conversion mechanism shaft in the axial movement of the core, characterized in that, with the aim of uproning the construction while simultaneously increasing the reliability and expanding the range of its application, the measles in it is made in the form of two rings fixed on the disks of the shaft twisting transformation mechanism into axial movement of the core, one of which is rigidly fixed on the shaft and the other with the possibility of axial movement, and the inductive converter magnetic circuit is made in the form of two ferromagnetic rods with windings fixedly mounted along the axis of the shaft without mechanical contact with the rings of the core and protruding at their ends for the outer periphery of the rings by the amount of possible axial displacement of the shaft. 2. A device according to claim 1, characterized in that the ferromagnetic rods in the zone of movement of the core rings are made of material with high magnetic resistance, for example carbonyl iron.