SU1627854A1 - Electromagnetic balance - Google Patents

Abstract

The invention relates to weighing equipment and can be used in weighing instruments, weighers, dosing units and specialized weighing tools with full or partial magnetic balancing. The purpose of the invention is to increase the rate of reduction of masoogable richmer. The control system during the operation of the n mode Correction provided. the supply of current to the power coil in order to exclude the impact of the reference load on the power coil with the release of the reference load. After the completion of the work in the Correction mode, the supply of current to the power kagulchu provides lifting the load of the load of its possible potential by using spring-loaded C i mpi i. 5 il. F

Description

The invention relates to weighing technology and can be used in weighing instruments, weights, dosing devices and specialized weighing devices with full or partial electromagnetic balancing.

The purpose of the invention is to improve the accuracy and reduce the weight and size parameters of the scales.

11l figure 1 schematically shows an electromagnetic scale, in fig. 2 is a section A-L in FIG. on fig.Z - section bb in figure 2; figure 4 - block diagrams. scales and control unit; Fig. 5 is a diagram of the passage of control pulses in the process of working iisov in the modes of Correction and Measurement.

Electromagnetic scales contain a magnetic system 1 with a constant pulse 2, a sich coil 3, which is connected with a rod 4 to a load-receiving cup 5, an elastic suspension 6, to which a load-receiving device consisting of a power coil 3, a rod 4 and a cup 5, The stitching weight 7, the reference grout S, is placed in the support. The wedge-shaped groove is made in the side surface of the i rropoio and which is tpi fixed with two clamps 9 and 10 made in the form of two double-sided rhpages, one end of which has a side-sided side and og hinge but secured and the base of the h.ch- help rods 11 and 12, fixed on the basis of 13 weights,: lapimpnne

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supports 14, through springs 15 in one end connected with base 13, with other connecting clamps 9 and 10 with two cores 16 and 17 of electromagnet 18, displacement sensor 19, power balancing system 20, reading unit 21 and control unit 22. The power balance system unit 10 contains an irotation-pulse modulator 23, a third switch 24, an adder 25, a reference current source 26.

The control unit 22 holds two logical elements OR 27 and 28, two single-oscillators 29 and 30, a delay block 31 and 32, the first and second keys 33 and 34, and a current source 35.

Electromagnetic scales work as follows.

And the measured weight is 7 by mass, where PY is the force of gravity, g is the acceleration of free fall displaces the load receiving device and displacement sensor 19, which outputs a signal to the power balance circuit 20. At the output of power balance circuit 20, a compensation current IK is generated. IO utx / T (T c is the current at the output of the reference current source 26, and A-tx / T is the signal at the output of the PWM block 23) arriving at the first input is the sum of a torus 25, while the first key 33 of the control unit 22 is open the second key 34 is open and the gallop weights 8 are secured by the clips 9 and 10 in the up position.

At the moment of equality of gravity force PJ, depending on the measured mass

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mx, the power of the RK, created by the power coil 3, i.e. Px Pv ((B is the magnet induction, 1 is the total number of turns of the power coil), the value of the measured value is fixed on the reading device 21.

The operation of the balance in the sensitivity sensitivity correction mode is carried out by imposing a reference mass of the reference weight P0. When the voltage pulse voltage block 22 arrives at input K (for example, a button), a single-pulse switch 29 is started, the output pulse of which, arriving at the control switch of the first switch 33, closes it, connects the current source 26 for the pulse time to (( 4). vtssets adder 25, resulting in sipov kagushka 3 gets imp ibc currents D10, the power of the DR.

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 B11O lifts the power coil 3 to the reference load 8, through the delay time tj generated by the block 31, the one-shot 30 is started, the output impulse of which, arriving at the control input of the second switch 34, short-circuits it, connects the current source 35 to the coil of the electromagnet 18. The cores 17 and 16 of the electromagnet are pulled in, the reference load 8 is released by the latches 9 and 10 and without impact rests on the power coil 3. The action of the pulses a and b (Fig. 4) ends. The electromagnet cores return to their original position. When the coil of the electromagnet 18 is de-energized, the sensitivity of the balance is corrected for a given mass t0.

Before the Correction mode, the balance is reset (Fig. 4). so, with that 0, the reading device 21 also has zero readings. After setting the zero and calibration, the balance is ready for the Measurement mode.

Pulse Measurement at the input And control unit 22 (for example, from a button) —the one-shot 30 starts, turns on the electromagnet 18, the cores 16 and 17 are retracted, the latches 9 and 10 turn around the axes 11 and 12, move to the sides and over time delays tj, formed by the delay unit 32, launches a one-shot 29, the output pulse of which is fed to the control input of the first key, connecting the output of the first key 33 to the input of the adder 25, resulting in a current pulse UI0L under the action of which the power coil 3 raises and after the reference pulse L load 8 is gripped by clamps in turning off the electromagnet 18. The reference weight 8 is raised, and after the measurement.

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Claims (1)

Invention Formula Electromagnetic scales containing a load-receiving cup connected to the base through an elastic suspension, connected to a power coil, placed in the gap of the magnetic system and equipped with a displacement sensor, the output of which is connected to the power balance system, the first output of which is connected: by an input of a counting device, and the second output is with the input of the power coil, a reference weight, equipped with two spring-loaded clamps of its position, each of which is associated with the core of the electromagnet, and the control unit whose input Correction is connected to the first input of the first logical element OR and through the first delay unit to the first input of the second logical element OR whose second input is connected to the input Measurement of the control unit, while the Measurement input of the control unit is also connected via a second delay unit with a second input of the first OR logic element, the output of which through the first single vibrator is connected to the control input of the first key, and the output of the second logic element OR ithout second monostable multivibrator is connected to a control input of the second switch through which a current source is connected to the electromagnet, wherein e ui and in that, in order to increase the point 10 278546 To measure and reduce the weight and size of the pod, the electromagnet is made with two cores, and the spring-loaded lock is in the form of a hinged arm in the base of the two shoulders, one spring-loaded end of which is pivotally connected to the corresponding electromagnet core, and the other is made with a wedge-shaped side, under which has a wedge-shaped groove in the side surface of the reference weight, and the power balance system is designed as a reference current source connected through the third a key to the adder, and the output of the pulse-width modulator is connected to the control input of the third key, and the input of the power balancing system is connected to the input of the pulse-width modulator, and its first and second outputs respectively to the outputs of the pulse-width modulator and adder, the second input of which through the first key is connected to the output of the reference current source. 15 20 25 Fig.Z 4