SU1368648A1 - Mass-measuring device - Google Patents

Abstract

Invention m. Used for precision mass measurement with discrete or continuous weighing A-A. The purpose of the invention is to increase the accuracy and service life. To measure the mass, the load is placed on plane 3 of the charging flange 4 so that the center of mass of the installed load is on the NN axis. Due to the force-frequency effect, the frequency of oscillations of each piezo-quartz plate 9 increases directly in proportion to the mass of the measured load. The electrical signals from each electronic driver 17 are taken to adder 19, where the increment in frequency is summed. Further, the signals arrive at indicator 20, where the mass value is displayed in units of mass, 2 Il. with (L

Description

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FIG. 2

one

The invention relates to a weighing instrument and can be used for precision measurement of mass in case of distortion or continuous weighing.

The purpose of the invention is to improve the accuracy and service life.

Figure 1 shows the functional diagram of the device; on FIG. 2 - section A-A in FIG. one .

The diagram of the device shows a heavy-duty flange 1 with a receiving element 2 and a loading plane.

the initial frequency f, must correspond to the given G value, and the value of the scale factor M, must correspond to the specified value of the scale factor M ,.

If the initial frequency f does not coincide with the specified value, the difference is eliminated (by changing the values of inductive-capacitive chains) using the corresponding adjustable loop 18, the initial and specified frequencies are equal: f, f.

If the scale value does not match

3, the supporting flange 4 and the flexible removal of the if coefficient M, with a predetermined value Md change the value of the mechanical stress on the corresponding plate 9 by rotating the stop screw 15, which by means of the tension bars 11-13 and the elastic elements 16, creates a force along the transverse axis QQ, piezoplates 9 due to a change in force action. VIA on the plate from the side of the screw.

25 The transform coefficient of the transverse axis QQ is significantly lower than the transform coefficient of the force acting along the main axis 00 and therefore the adjustment of the scale

30 coefficients in a limited range are produced with high accuracy. After setting the scale coefficients and frequency values (f, M, MO), the device is closed with a removable

body 5 with gaskets 6 and tightening clamps 7. A load flange 1, a support flange 4 and a removable flexible body 5 with gaskets 6 and tightening clamps 7 provide the possibility of creating an airtight seal in chamber 8. volume in which piezo-quartz plates 9 are installed with electrodes 10.

The load and support ends of each piezoquartz plate 9 are fastened with flanges 1 and 4. On the side faces of each piezoquartz plate 9 there are three tension bars 11–13 interconnected by means of guide pins 14, stop screw 15 and elastic elements 16. Electrodes 10 piezo quartz plates

9 are connected to the inputs of the corresponding g flexible housing 5 (in a vacuum or medium

neutral gas), creating then with. using sealing gaskets 6 and tightening clamps 7, the hermetic volume in chamber 8 with 40 piezo quartz plates 9 placed in it.

The electronic exciters 17, in parallel with which the reactive circuits 18 are connected. The outputs of the electronic exciters 17 are connected to the inputs of the adder 19, the output of which is connected to the input of the indicator 20. The transverse axis of the 9 frequency sensitivity passes through the torx piezoquartz plates 9, the transverse axis passes through the lateral faces of the plates 9 QP 45 forces of particular sensitivity. The NN axis is the local vertical axis.

The device works as follows.

The device by means of the support flange 4 is installed on the base

To measure the mass, a weight (not shown) is placed on the loading plane 3 of the loading flange 4 (or acting on the receiving element 2) in such a way that the center of mass of the installed load is on the NN axis.

50

Due to the force-frequency effect, the oscillation frequency of each piezquartz plate increases in direct proportion to the mass of the measured load. The electrical signals from 55 of each electronic driver 17, whose frequency corresponds to the oscillation frequency of the plates 9, are taken to the adder 19, where the frequency gain is summed.

in such a way that the direction of the local vertical NN (axis of the local vertical) coincides with the axis of sensitivity of the device 00. In this case, the main axes of the force-frequency sensitivity of the OO piezoquartz plates 9 coincide with the direction of the local vertical NN. Here, the value for weighing a weight (not shown) is placed on the loading plane 3 of the loading flange 4 (or acting on the receiving element 2) in such a way that the center of mass of the installed load is on the NN axis.

Due to the force-frequency effect, the oscillation frequency of each piezquartz plate increases in direct proportion to the mass of the measured load. The electrical signals from each electronic driver 17, whose frequency corresponds to the oscillation frequency of the plates 9, are taken to adder 19, where the frequency gain is summed.

From the adder 19, electrical signals arrive at indicator 20, where the mass value of the measured load is displayed in units of mass.

Claims (1)

The change in the center of mass of the measured load to the left or to the right of the axis in the range between the axes 00 and does not cause measurement errors, since the total value of the force from the weight of the load remains constant. After the measurement, the load is removed from the loading flange 1, the device is again ready for operation. Invention Formula A device for measuring the mass, comprising a housing, piezo-quartz plates attached to the load, are located the exciting electrodes connected through a driver to a mat connected to the indicator, and power adjustment mechanism often 5 you are different that, in order to increase the accuracy and yield of the work, the mechanism of power frequency tuning is set on the sides The 10 facets of piezoquartz plates are made in the form of three pressure plates interconnected by pinning them with studs, and two pressure plates are installed on the side edges 15 piezoquartz plate, and the third has a threaded hole, in which a stop screw is mounted, connected through an elastic element to one of the pressure bars, this housing nominal and supporting flanges, with the main section 20 being made in the form of a flexible element, the edges of piezoquartz plates fixed to the flanges with clamps. 6 1 placed exciting electrodes connected through a pathogen to the adder connected to the indicator, and the power trim mechanism is often you are different that, in order to increase the accuracy and service life, the power frequency tuning mechanism is installed on the side faces of piezoquartz plates and is made in the form of three pressure plates interconnected by guide pins with studs, with two pressure plates mounted on the side edges piezo quartz plate, and the third has a threaded hole in which a stop screw is installed, connected through an elastic element to one of the pressure plates, this housing being 15139 u figure 1