SU1107000A1 - Electromagnetic balance having three supports - Google Patents

Abstract

Tripodal ELECTROMAGNETIC SCALES containing the load cup base with attached to it a system of elastic suspensions, three magnetoelectric power compensator three movement sensor, whose outputs are connected through inverters in series with the coils magnetoelectric power compensators and an adder currents, characterized in that, in order to increase the highest limit of weighing scales, the elastic suspension system is made in the form of three upper radially angled 120 angles in one plane consoles and three lower consoles parallel to them, and at the ends of the upper consoles magnetic systems of magnetoelectric power compensators are fixed, on which the load-receiving cup is installed by means of the stops, and the ends of the lower consoles are rigidly fastened with coils of magnetoelectric power compensators, and transverse the grooves forming the necks for the upper and lower consoles of different thickness, while the electrodes of the capacitive displacement sensors are located n and isolating substrates between upper and lower consoles.

Description

The invention relates to measuring Texfrnice and can be used to accurately measure the mass of various cargoes. Electromagnetic scales containing a load-receiving cup are known - an elastic parallelogram mechanism, a sensitive element, an electric compensator, a non-compensating transducer, and an equilibrium electric circuit 11. These scales have a low maximum weighing limit and are difficult to manufacture and adjust. The closest to the proposed technical entity are electromagnetic scales containing a load-receiving cup, a base with a system of elastic suspensions fixed on it, three magnetoelectric power compensators, three displacement sensors, the outputs of which are connected through converters with cathodes of magnetoelectric power compensators and with current accumulator C2 . The known ones have a low lowest weighing limit, the value of which is limited by the value of the nominal compensating force generated by the magnetoelectric power compensator. The purpose of the invention is to increase the maximum weighing limit. This goal is achieved by the fact that a three-support electromagnetic scale containing a load-carrying plate base with a system of elastic suspensions fixed on it, three magnetoelectric power compensators, three displacement sensors, the outputs of which are connected via transducers in series with coils of nitroelectric power co-generators and with current accumulator, the elastic suspension system is made in the form of three radially upper upper angles 120 one plane of the consoles and three lower consoles parallel to them, with magnetic systems of magnetoelectric power compensators fixed at the ends of the upper consoles, on which the load-bearing cup is installed by means of the stops, and the ends of the lower consoles are rigidly fastened to the coils of the magnetoelectric power compensators, and in the area of sealing con0 -2 salts in the base are made transverse grooves, forming necks for the upper and lower consoles of different thicknesses, while the electrodes of capacitive displacement sensors Are located on an insulate; their substrates between the upper and lower consoles. The drawing shows schematically three-support electromagnetic scales. The balance consists of a load-receiving cup 1, on which a weighed weight 2 is placed, a load-receiving cup 1 by means of stops 3 is mounted on magnetic systems 4, which, together with support rings 5, are fixed on the upper brackets 6. A power compensation coil 7 by means of a central rod rigidly bonded to the lower HHNCH consoles 8. Consoles 6 and 8 have transverse grooves in the area of their embedment, between which are formed necks 9. The common end part of the elastic consoles 6 and 8 is fixed in the base 10 by means of a clamping sleeve 11. Between the consoles 6 and 8 on the isolate x substrates are electrodes 12 and 13 of capacitive sensors of relative movements of the consoles connected to the inputs of transducers 14-16 displacements into electric current. The outputs of the latter through the coil 7 power compensation connected to the input of the adder 17 currents. Scales work as follows. The weighed mass of the head is arbitrarily placed on the load-carrying cup 1. The weight P depending on the location of the mass of ha on the cup is appropriately distributed to the stops 3, so that P PX + PX + Py cause pro + PV ,. The forces P, y iy, the portioned displacement Xj of the cantilevers 6, defined by the hardness c, c, Cj of their working journals 9. The movements of the cantilevers b cause corresponding changes in the capacitances of the displacement sensors, which are converted by converters 14-16 into electric currents 1, 12 and ij. These currents create in the coils 7 of the compensation force ,, F 12BI2; F ij. where 1 Ij, is the length of the active turns of the coils 7;

B - magnetic induction in a zazhorazmamagnitnoy system; I ,, 1,2. and% currents in coils

magnetoelectric converters.

The forces F, P2, and FJ of the force compensation coil interactions with the magnetic system act on the arms 8 and cause displacements x; J, x, and x |, which are determined by the hardness 2 and c1 of the necks of the arms 8.

t mi,

On the other hand, the forces of the magnetic systems -F, -F and 7, equal and opposite to those of the KaTsraieK-force compensation, act on the elastic arms 6 towards the corresponding components of gravity R. As a result, each of the arms 6 is under the influence of the force difference P - - F. RCS - P2 and - E3, causing proportional displacements x 2 and x. The displacements x, x and x are balanced in the autocompensation system by displacements x, z and x and with sufficient accuracy can be considered that x Xj Xj xs x.

Because

.bai5 ,,, BczzB, .BiiiS.

and polyhga to simplify

Sa s, s; with

WITH; ci cj with

we will get three equations solved by auto-compensation systems

Px.-ff

ft. with . with with

   2a6l2

with. E

 - 3 esBIi

From p. S

Assuming the equality of Ts 1 1 1 and taking into account that the output current of the adder 1 1 + 1 + + It. and the power of P P. + P .. + p half, and power P P, + PX +

chim

) 1В1х

20

 (one

The 1B1 multiplier determines the value of the total compensating force F (developed by magnetoelectric converters.

Thus, the proposed electromagnetic scale allows weighing the weight of Pj (1 4-) times

more than the total compensating power of the FI magnetoelectric converters.

The use of the invention will significantly increase the maximum weighing limit of compensation-type armless scales.

Claims (1)

THREE-SIDE ELECTROMAGNETIC SCALES, containing a load cup, a base with a system of elastic suspensions fixed to it, three magnetoelectric power compensators, three displacement sensors, the outputs of which are connected in series with the coils of magnetoelectric power compensators and with a current adder, characterized in that, in order to increase of the largest limit for weighing the balance, the elastic suspension system is made in the form of three upper radially located at an angle of 120 ° in one plane it and three lower consoles located parallel to it, and at the ends of the upper consoles there are fixed magnetic systems of magnetoelectric power compensators, on which a load receptacle is mounted by means of stops, and the ends of the lower consoles are rigidly fastened with coils of magnetoelectric power compensators, and transverse in the base grooves forming necks for the upper and lower consoles of different thicknesses, while the electrodes of capacitive displacement sensors are located on insulating substrates between the upper and lower consoles. 1 1107000 2