SU468102A1 - Digital Measuring Instrument Strain Balance - Google Patents

Description

(54) DIGITAL MEASURING DEVICE

In p

B v: -; SHAFT SENSORS

The invention relates to weighing technology. A measuring device for electro-strain gauges for weighing rail cars on the go is known, containing a null organ whose inputs are connected to strain gauges and a linear decoding converter, and the output is connected to a register synchronized by a pulse distributor and connected by outputs from the inputs of an adder, in which each decade consists of four trcggers, with weight values of rc 2 and 2. The device is based on a parallel-balancing method with parallel signal compensation. The measured signal of strain gauges, proportional to the mass of the object being weighed, is compensated at the input of the null organ by the reference voltage of the linear-decoding converter. The difference signal is amplified in the null-organ path and, depending on the over-compensation or under-compensation, changes its phase to the opposite. The output element of the zero-body, which operates in the phase-shift mode, provides, together with the register and pulse distributor, data input to the adder, if the measured signal is not overcompensated. In a known instrument, code 2-4-2-1 is used. in a linear decoding converter. The use of this code determines the presence of a decoder between each pair of decade of the adder and the register during the repeated measurement of the signal in order to use the statistical measurement method. The complexity of the decoder due to the fact. In the inevitable parallel data entry per decade of the adder, it is necessary to distinguish the state of its triggers. The proposed digital measuring device for strain gauges, to simplify it, is equipped with inverters, AND and OR circuits, and each decade of the register in it is made in the form of five triggers, with weights 2, 2.2, 2, and I, a single the input of each of which is connected to one of two inputs of five AND circuits, the second inputs of which are connected to the outputs of a pulse distributor, where the outputs of AND circuits connected to triggers 2 registers are connected to four inputs of an OR circuit whose output through an inverter is capacitively connected Zannuyu with zero exit trigger 2 decade of the adder, connected to the counting input of trigger 2 and the zero input of the trigger 2 decade of the adder, and the counting input of the trigger

2 decades of the adder are connected via an inverter connected capacitively to the previous decade of the adder and connected to the output of the AND circuit connected to the trigger of the decade of the register.

The drawing shows the scheme of the proposed device.

The following notation is taken: linear decoder converter 1; nuleorgan 2; teizodatchiki 3; decade 4 registers, consisting of five triggers with weights of 2, 2, 2, 2 and a distributor of 5 pulses; scheme

at 10; OR 11; decade 12 sumgora, containing four triggers with weight .0,

, 3,

2, 2, 2, 2 grains of a stor of T, 1 inverters; condensers C, C inverters; diodes D, D ,,

decades of adder.

The measuring device operates as follows.

Prior to the measurements, all the griggers are in the initial state. With the start of measurements using the distributor of 5 pulses per decade 4 of the register, cocked ipnri-ep 2 connected to the circuit

Y. They sang the signal of strain gauges 3, recompensated, go-trip with the help of a zero-organ 2 is reset, the data in decade 12 of the adder is not entered, and chritGer 2 in the decade 4 registers, combined with the And 9 scheme.

In the same case, when the signal iefi3Odagchiki 3 is undercompensated, in the decade of the register trigger 2, connected to the AND 1U circuit, remains in the biennium interface. The cocked state of this Tpiiiiejja together with the signal has distributed 5 pulses by means of the circuit 11 10 through the circuit OR J 1. and the inverter T.-j providing 1y.) Giving a pulse to

one

schexny RXfiti gri | 1era 2 and zero

trigger input, 2 decades of adder 12. At the same time, adder 12 is confirmed

about

the initial state of trigger 2 and cocked

trigger 2. The following two, received from the AND 9 scheme, will return the trigger

2 to the initial state. Wherein

2 will trigger 2, as usual

binary-decimal counter, and t, d.

2 Before trigger 2 is raised,

any deuce enters trigger 2,

3

If trigger 2 is set, i.e., the number 8 is stored in the decade of the adder, then the next signal with a weight value of 2, being at the zero input of trigger 2., will reset it to its original state, ensuring the transfer of a pulse to the next decade of the senior totalizer . Trigger

2 does not work at the same time, since

Q

cocked trigger 2 through diode D is blocked by trigger input .21, As for signals with a weight value of 1, th when cocked trigger 1 of register 4 is transmitted through transistor T, the pulse arrives

on the counting trigger input 2 decades 12 adders. Through the capacitor C.

the input of decade 12 of the adder is connected to the output of the previous decade, and the capacitor

C connects bit 2 to bit 2

And redmet invention

A digital measuring instrument for strain gauges containing strain gauges, a linear-decoding converter, a register, a pulse distributor, a sum.-gator, in which each decade consists of

four trigtvrov with weights

If Ifff IfIf If // o - //

 , -, 2 and 2, and null-organ, to the inputs

gene sensors and a linear decoding converter connected by inputs to the voltages of the decad- ing trigger triggers, zero inputs4.1 of which are connected to the output of the zero-organ, and single inputs of the triggers of the decade register are connected to the outputs of the pulse distribution gels, about l And with the fact that, with a pellet (by simplification, it provides nvertoraml, thread thread schemes AND and OR

each decade of the register in it is executed in the form of five triggers with weight values of 2, 2, 2, 2 and 1, a single input, each of which is connected to one of two inputs of five And circuits, the second inputs of which are connected to the outputs of the distributor pulses, with the outputs of the circuits And,

connected to the trigger 2. register, connected to the four inputs of the OR circuit, the output of which through the inverter, capacitively

associated with zero trigger output

2 decades of the adder, connected to the counting input of trigger 2., and zero in3

; do trigger two decades of adder, and

the counting trigger input of 2 decade of the adder is connected via an inverter capacitively connected to the previous decade of the adder and connected to the output of the AND circuit connected to the trigger of the decade of the register. F Y