SU1352255A1 - Force-measuring transducer - Google Patents

Abstract

The invention relates to the field of force measurement using strain-retardant sensors. The purpose of the invention is to improve accuracy by compensating for torque. A tensile force is applied to the sample through the hard center of the sensor. A signal proportional to the magnitude of the axial force is generated at the output of the bridge circuit 11, and a signal proportional to the torque value is output at the output of the bridge circuit 12. The non-inverting input of amplifier 13 is supplied with a signal from the output of bridge circuit 11. At the output of amplifier 13, the magnitude of the signal will correspond to the difference of signals from bridge circuits 11 and 12. This value is proportional to the value of the measured force without the influence of torque. 6 Il. (L VyhoZ 00 SL N3 Yu SL SL Fig. 5

Description

113522) 5

This invention relates to measuring forces using strain gauge sensors.

The purpose of the invention is to improve accuracy by compensating for torque.

FIG. 1 shows a sensor; in fig. 2 - beam of each sensor beam, axonometric; in fig. 3 is a basic bridge circuit for measuring forces without torque compensation; in fig. 4-- additional bridge circuit for torque measurement MOCTOHOV 1 / chgr circuits (1 transducer 1A is connected to the inverting input of amplifier 13 and the measurement result is removed from the output of amplifier 13.

Load sensor works as follows.

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Tensioning force F is applied to sample 15 through a hard center 3 of the sensor. At the same time, axial and tangent deschems occur in the beams 1 and 2 due to the stretching and twisting of the sample 15; in fig. 6 is a test setup of the about-15 formations perceived by the strain tensor by stretching. At the output of the bridge circuit 11, a signal is generated that is proportional to the magnitude of the axial force, and at the output of the bridge circuit 12, a signal that is proportional to the torque value. Since it is not known in advance what sign the signal will form at the output of bridge circuit 12, it is fed to the input of converter 14, as a function

the outer ends of the rigid jumper 4. 25 which includes stabilization of the sign

On beams 1 and 2 of each beam, the signal was set at the output regardless of the resistance strain gages included in

bridge circuits. Beam 1 of each beam

it is executed in the form of two rigidly; in fig. 5 - bridge connection

A load cell contains an elastic element of two halves, consisting of three beams, located at an angle of 120 to one another. Each beam consists of two beams 1 and 2 one above the other with a common hard center 3 and connected on

The non-inverting input of amplifier 13 is supplied with a signal from the output of bridge circuit 11. The output of the amplifier of the 13th century signal at the input is output. In this case, the output of the converter 14 is provided with a positive polarity of the signal between itself and, for example, welding, a bridge circuit 12, which is fed into parts 5 and 6 of rectangular section, the inverting input of amplifier 13. whose planes are perpendicular to each other, and of these, strain gages 7–10 are installed on both sides, and the sensing signal deformation corresponds to the difference of different signs. Beam 2 of each signals of bridge circuits 11 and 12. This beam has a rectangular cross section and the value is proportional to the value of i- located parallel to part 5 of the beam of measurable force without the influence of the steepness - 1, and part 6 of beam 1 is not in contact time, soar. with the inner surface of the ball Q.

Claims (2)

ki 2. On both sides of beam 2, the formula of the invention of strain gauges 7 and 8, per-. overcoming the deformation of a different sign. A force measuring sensor containing a force for measuring without a compensating elastic element made of torque uses the pavement of two identical halves, each of scheme 11, in my opposite shoulders which consists of beams of a straight line which include resistance strain gages 7 of the transverse cross section lying and 8. To compensate for torsional moments in one plane, the inner ends of the one use a bridge circuit 12, in the beams — both halves are connected by common adjacent arms of the bridge which are connected by rigid centers, and the outer ends strain gages 9 and 10, the sensing beams are rigidly connected to one half of the deformation of a different sign from the alkaline steep to respective ends of the other half of the beams, and strain gauges arranged on planes beams .j greater area and included in the basic bridge skh.emu, characterized th moment. To measure the torque with respect to torque, joint switching on bridges of circuits 11 and 12 is used, as shown in FIG. 5. The output of the bridge circuit 11 is connected to the non-inverting input of the operational amplifier 13 - the adder, and the output the fact that, in order to ensure accuracy by compensating for the effect of torque, an adder and MOCTOHOV 1 / chgr circuits (1 transducer 1A is connected and the absolute is connected to the inverting input of amplifier 13. The measurement result is removed from the output of amplifier 13. Load sensor works as follows. The non-inverting input of amplifier 13 is supplied with a signal from the output of bridge circuit 11. The output of the amplifier of the 13th century signal at the input is output. The output of the converter 14 is provided with a positive polarity of the signal from the bridge circuit 12, which is fed to the inverting input of the amplifier 13. The signal is equal to the difference between the signals of the bridge circuits 11 and 12. This value is proportional to the value of the measured force without affecting the torque , the fact that, in order to ensure accuracy by compensating for the effect of torque, an adder and a signal converter to its absolute value; each beam of one of the halves of the elastic element is made of two parts, one of which is connected to a rigid center, the placement plane of the resistance strain gages are perpendicular to each other, and the resistance strain gages are They are parallel to the measured force, connected to an additional bridge circuit, with the main bridge connected to the first input of the adder, and an additional one through the signal converter to its absolute value to the second input of the adder. 1 YU 6 Logout. Oh oh D / G5 AND jieL ///////////////// d a f t ( Editor M. Petrov Compiled by V. Godzikovsky Tehred A. Kravchuk Proofreader G. Reshetnik Order 5555/37 Circulation 776 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4