SU509788A1 - Weighing device - Google Patents

Description

one

The invention relates to the field of weight measuring.

Weight measuring devices are known which contain an elastic element with an electromagnetic compensator in a solenoid bide, the bark of which is rigidly connected to the elastic element, and a displacement meter with an indicator.

i However, the accuracy of such devices is insufficient

In the proposed device, the disadvantage i is eliminated by the fact that the electromagnet compensator is made in it with a character that is inverse to the non-linearity s of the vocabulary. the elastic element, the solenoid winding is made on a material with a thermal resistance co-faction that is inverse to the coefficient of the elastic modulus of the auger element, and the chain of the winding is a heat-sensitive element.

FIG. 1 is a schematic representation of the description of the venous device; in FIG. 2, the family of its half-hacks.

The device contains gfuzhny elastic element 1, located in the housing 2, on

the load element 3, the upper support 4 and the displacement transducer with indicator 5, the solenoid 6 of the compensator are fixed in the housing 2. Inside the solenoid 6 there is a bore 7 connected to the load element 3. The winding 8 of the solenoid 6 is made of a material with a positive drag coefficient and is fed on through the heat connector 9. Solenoid 6 is fixed with screw 1O. The power supply unit 11 through-i cut the thermoelement 12 and the amplifier 13 is connected to the winding 8 of the solenoid 6.

Claims (2)

The electromechanical characteristic (Y on fkg. 2) of the compensator is nonlinear, its magnitude depends on the parameters of solenoid 6 to core 7 and can be chosen equal in magnitude and inverse to the characteristic of the elastic wavelet 1 (curve P in FIG. 2) The sign of whether or not the apmechanical case of the compensator, formed by a solenoid 6 with a cable 7, is determined by the beginning of the cortex 7 inside the solenoid 6, the coqpoe is regulated by the movement of the sodenone; Yes 6 with the help of screw 1O. The device works as follows. When} the elastic of the elastic element 1 and: measurable force measles 7 is mixed inside the solenoid 6, while the force acting on the elastic element 1 through the load element 3 connected to the chamber 7 is added to the correction force of the solenoid 6.i. Corr 7. Since the nonlinearity, the characteristics of the elastic element I and the condenser are equal in magnitude and inverse in sign, the total characteristic is linear (Fig. 2). Temperature error due to a negative temperature coefficient; volume modulus of elasticity of the material of the elastic element. When the temperature changes in the range tn t (-v tp, the characteristic of the elastic element changes (curves I, П and 1И in Fig. 2), where n is the calibration temperature; I "is the lower temperature limit of measurement; f is the upper temperature limit of measurement. Change of temperature in the interval L tp, causes a change in the windings 8 of a solenoid 6 made of a material with a positive thermal resistance coefficient, and, therefore, a change in the electromechanical characteristic of the compensator depending on the current in the solenoid winding (curves IV, V and V1 in FIG , 2). Su The mmar characteristic of the KONV pepsator and the elastic element (with t.. h are characteristics 1 and 4. U1 and with ttt are characteristics of 111 and PG) is equal to the graduation characteristic (right of UN with i I}, Basi is over graduated. Thus , a change in the characteristic of the compensator compensates for a change in the characteristic of the elastic element with a change in temperature. To extend the range of temperature compensation, a sensitive thermoelement 12 is included in the winding circuit 8 of the solenoid 6, which perceives a change in the ambient temperature and converts temperature to change the electrical signal. Claim 1. Weight measuring device containing an element with an electromagnetic compensator in the form of a solenoid, the measles of which is rigidly connected with an elastic element, and a displacement meter with an I1 scooper, characterized in that in order to increase accuracy, the electromagnetic compensator is made with a characteristic , the nonlinearity of which is the inverse nonlinearity of the characteristic of the elastic element. 2. The device according to claim 1, wherein the winding of the solenoid is made of a material with a thermal resistance coefficient, opposite in sign to the coefficient of elastic modulus of the element, and the winding power supply circuit is connected to a temperature-sensitive element.