SU1386970A1 - Device for controlling batch-type scale - Google Patents

Abstract

The invention can be used in automatic control systems for batch dispensers, dial weight indicators, (1) The purpose of the invention is to simplify and improve the reliability of the device. A device for controlling a weight batch dispenser contains a square pulse former 1, an angle-time converter 2, unit 3 portions, trggera 4, 5, and 12, elements 6, 8, 10, and 15, one-shot 7 and 14, block 9 of the display, generator 11 pulse cycles and generator J3 start-up pulses. n to the inputs of the one-shot 7 and 14. The first and second inputs of the element 15 are connected respectively with the output of the one-vibration 14 and with the output of the trigger 12. 1 ill. 1 WITH with 00 Oi from

Description

The invention relates to weighing technology and can be used in automatic control systems for portioning dispensers having dial gauges. The purpose of the invention is to simplify and improve the reliability of the device.

The drawing shows a functional diagram of a device for controlling a weight batch dispenser, i The device contains a square pulse maker I 1, a connected output to the converter I inputs 2 angle - time interval, the first setting I 3 portions and the first inputs I of the first A and the second 5 triggers connected by the second input, respectively, with the first and second outputs of the porium indicator. The first element And 6 is connected by the first and second inputs respectively to the first outputs of the first and second triggers, and the third input to the output of the first one-vibrator 7. The second element And 8 is connected by the first input to the second output of the trigger, and the second input to the first the input of the display unit 9, with the output of the converter angle - time in

terval and the fourth entrance of the first

element AND “The third element AND 10 is connected by the first and second inputs of the corresponding 11 to the output of the generator 11 pulses of the cycle and to the first output of the third trigger 12, and the output to the second and third inputs of the display unit and to the input of the square pulse former. The output of the second element I is connected to the first input of the third trigger, the second input of which is connected to the output of the generator 13 via a booster. The output of the first element And is connected to the inputs of the first 7 and second 14 single vibrators, and the first and second inputs of the fourth element And 15 are connected respectively to the output of the second single vibrator and the first output of the third trigger.

The angle-time interval converter consists of a chimney 16 made of magnetically tricky material5 whose ends are clamped by a silencer 17, an input magnetostrictive converter 18 is connected ™ to the output of recording amplifier 19, while the sump is made ring-shaped with a center coinciding with axis 20 of arrow 21 dial knob rigidly connected with

0 5 0 5

0

5 0 5

g 5

the associated output magnetostrictive transducer 22 connected to the read amplifier 23, and the input of the recording amplifier is connected to the input of the converter. The unit adjuster consists of a chute 24 made of a magnetostrictive material, each end of which has a silencer 25, an input magnetostrictive converter 26 connected to the output of recording amplifier 27, two output magnetostrictive converters 28 and 29 connected respectively with the inputs of the first 30 and second one 31 read amplifiers. The input of the recording amplifier is connected to the input of the setting device, and the outputs of the first and second amplifiers of the coupling are connected respectively to the first and second outputs of the setting device, while the conductor materials of the angle converter - time interval and the setting unit of the portion are selected to be the same.

The display unit consists of a generator 32 counting pulses connected to the first input of the fifth element I 33, the output of which is connected to the counting input of the counter 34 pulses. The output of the fourth flip-flop 35 is connected to the second input of the fifth element I, and the output of the pulse counter is connected to the indicating device 36. The first input of the fourth flip-flop, connected to the output of the read amplifier, and the inputs Setting zero of the fourth flip-flop and pulse counter are connected to the output the third element And, the first input of the fourth trigger is connected to the first input of the display unit, the second input of the fourth trigger is connected to the BTopbJM input of the display unit. cation, and the second pulse counter input - with the third-1 input of the display unit.

The device works as follows.

In the initial state, the single vibrators 7 and 14 are in steady states and the potentials of their outputs are resolving, respectively, for elements I6 and 15. At the beginning of the weighing: 1 st, the generator 13 trigger pulses generate a pulse (at the command of the operator), which sets Trigger 12 goes to the zero state. After that, the trigger potential 12 comes from the output of trigger 12. One of the inputs of elements 10 and 15 enters. As a result, a control signal appears on the encoder: element 15.

under the action of which the loading actuator (not shown) is activated, for example a sector shutter, and the dosing material starts to flow into the weighing bin. After that, the first impulse (start-impulse) from the generator output 11 cycles passes through the open element I 10 and is fed to the input of the former 1 direct pulses, which is intended

to form a rectangular AND pulse with a given duration. The pulse from the pulse generator 1 code sets the triggers 4 and 5 to zero states, in which the potential from the output of the trigger 4 is prohibiting element 6 and the potentials from the output of trigger 5 are allowing the element 8 and prohibiting element 8. In addition, the start-pulse from the output of the imaging unit 1 is fed to the input of the recording amplifier 19, and then to the input magnetotricting transducer 18. Under the action of this pulse in the acoustic duct 16 in the direct conversion zone of the transducer 18, due to the direct effect EKTA magnetostriction arises of mechanical impulse voltage which propagates through the acoustic line 16 with Vjij- speed of sound from the zero point of the angle of rotation schiGtyvani dial indicator arrow 21 to ob- zone. The conversion of the output magnetostriction transducer 22 is rigidly connected with the arrow 21. Under the action of a mechanical voltage pulse, due to the inverse magnetostriction effect, an electric signal is generated in the winding of the output transducer 22, which is amplified and formed in a pulse by the read amplifier 23. This pulse is delayed relative to the start pulse by a delay time equal to

t A V, e

where 1, the length of the sound duct between the input 18 and the output 22 converters; Vjb is the speed of sound. This is how the angle of rotation of the pointer 21 of the dial gauge is converted into a time interval.

Similar to the described start-pulse from the output of the driver 1 pulses passes through the amplifier 27

Q

0 5 o

0

five

recording unit 3 portions, enters the input transducer 26, where in the duct 24 in the area of its direct conversion, a mechanical voltage pulse occurs, which propagates along the conduit 24 at the speed of sound and reaches the inverse transformation zone of the output converter 28. Under the action of a mechanical impulse An electrical signal is generated in the winding of the output converter 28, which is amplified and formed into an impulse by the read amplifier 30. This impulse sets the trigger 4 to the state in which the signal from its output is enabling for math And 6. The time interval between the start-impulse from the output of the pulse former 1 and the moment when the resolving potential is established from the output of trigger 4 is the duration specified Coarse tdo, b doses are set in advance by choosing the required length of the sound duct between the input 26 and the output 28 converters, i.e. by moving the transducer 28 along the bus duct 24.

In addition, the mechanical voltage pulse, spreading further along the conduit 24, after some time reaches the inverse transformation zone of the output transducer 29, under the action of which into its ob-. A coil of electrical power is generated, which is amplified and formed into a pulse by the read amplifier 31. This pulse sets the trigger 5 to a state in which the signal from one of its outputs is enabling for the element 8, and the potential from the other output prohibits the coupling for element 6. The time interval between the start-pulse from the output of the pulse former 1 and the moment the setting of the resolving potential from the output of the trigger 5 for the element AND 8 is the duration of the predetermined dose td, tn. It is precisely set beforehand by moving the transducer 29 along the conduit 24.

To increase the reliability of the device, it is necessary that gene 5 t-o-iu--,

ode, the repetition period of pulses from the generator output 1 1 cycle pulses.

Impulse from the output of the amplifier 23 counts | The input enters the second inputs of the Elements And 6 and 8, If the current ijieHHe of the measured weight is less than the specified dose Rough, i.e. if t, od ftA, o3bii ,, then the inputs of the elements

  -od, pulse duration,

generated by a single vibrator 7.

After time t. Single-vibrator 7 returns to the original stable

It is resolving for element 6. If during or after the first filling the value of the dosing mass is still in the range between the values of coarse and exact, i.e. t,

15

A-} N, ah, t and then the next pulse from the output of amplifier 23 passes through the opened element 6, starts one-shot 7 and 14, and the whole described process of filling is repeated again, and so on.

If after the next portion dosyp25

 And 6 and 8, the forbidden potentials come from the outputs of the 4 and 5 L flip-flops, so the pulse from the output of the amplifier 23 does not pass through them. After that, under the action of the second and subsequent pulses from the output of the pulse generator of the 11th cycle, the entire described Process will repeat until the eye after the impact of the Kth pulse from the output of the generator of the 11 pulses of the cycle-20, the value of the dosing Hass reaches the specified dose. . ,, the next pulse from the output of amplifier 23 arrives at the inputs of the elements 6 and 8 at the moment when the switching potential of the inputs of the other element 6 and the enabling potential of one of the inputs of the element 8 enters from the outputs of the trigger 5. Therefore, the pulse from the output of the amplifier 23 passes only through the open element 8 and switches the trigger 12 into the state when the potential from its output is prohibiting the elements 15 and 10. This completes the dosing process and the potential that is removed from the second output of the trigger 12 is controlling Ok signal stop dosing.

The display unit 9 operates as follows.

In each dosing cycle specified by the generator 11, the pulse from the output of the element And 10 (start-pulse)

34 pulses

There is a time to calm the mechanical system, the zero state, and also switches the trigger 35 to the zero state; at which potential with his code

la current value of the dosed mass will reach a given dose of coarse, that is, tdo., - caa-td „„ ,. In this case, a pulse from the output of the readout amplifier 23 arrives at the input of element 6, at the moment when the potential of the output of the output of trigger 4 is applied to its second input. At the output of element 6, a pulse appears that initiates the one-shot 7 and 14, - then, under the action of the inhibitory potentials of their outputs, the elements 6 and 15 are closed. Control signal

thirty

element exit

15 is finished

as a result, the loading actuator is turned off, and the dosing material ceases to flow into the weighing bin. After that, the dosing is carried out in the dosy-, pok mode, i.e., when the executive loading mechanism (sector shutter) starts to operate in the impulse mode. | Pulse duration t ,, generated by a single vibrator 14, determine - sets the counter

35

40

t-i one-shot i

Topics. Through time

14 returns to its initial state, and from its output, the resolving potential is fed to the input of element 15. As a result, an impulse of the control signal5 appears at the output of element 15, under the action of which the first filling of the dosing material takes place.

Pulse duration control50

55

is a resolving element for AND 33.

Starting from this point in time, the pulses from the generator output 32 of the counting-HbDc pulses pass through the open element I 33 and arrive at the counting counter of the pulse counter 34. A pulse appearing in time (; .top pulse) From the output of the read amplifier 23 switches the trigger 35 and the pulses 34 are no longer received in the counter 34.

-Aos

those. dosch value

 DOS one, oAt

  -od, pulse duration,

generated by a single vibrator 7.

After time t. Single-vibrator 7 returns to the original stable

g

It is resolving for element 6. If during or after the first filling the value of the dosing mass is still in the range between the values of coarse and exact, i.e. t,

five

A-} N, ah, t and then the next pulse from the output of amplifier 23 passes through the opened element 6, starts one-shot 7 and 14, and the whole described process of filling is repeated again, and so on.

If, after the next batch of dosyp0, the value of the metered chassus reaches the specified dose ,, the next pulse from the output of amplifier 23 arrives at the inputs of the elements 6 and 8 at the moment when the switching potential of the inputs of the other element 6 and the enabling potential of one of the inputs of the element 8 enters from the outputs of the trigger 5. Therefore, the pulse from the output of the amplifier 23 passes only through the open element 8 and switches the trigger 12 into the state when the potential from its output is prohibiting the elements 15 and 10. This completes the dosing process and the potential that is removed from the second output of the trigger 12 is controlling Ok signal stop dosing.

50

55

is a resolving element for AND 33.

Starting from this point in time, the pulses from the generator output 32 of the counting-HbDc pulses pass through the open element I 33 and arrive at the counting counter of the pulse counter 34. A pulse appearing in time (; .top pulse) From the output of the read amplifier 23 switches the trigger 35 and the pulses 34 are no longer received in the counter 34.

Thus, in display unit 9, the time interval is converted into a digital code determined by the number of pulses recorded in the counter 34 pulses in each dosing wall. The indication of the pulse counter 34 is given to the indicating device 36 in terms of the weight of the material being metered, which is used for visual remote monitoring.

Claims (1)

Invention Formula A device for controlling a weight portioning dispenser containing an angle-time converter, a display unit, a portion setter, a square pulse shaper, connected by an output to the converter’s angle-time interval inputs, a portion setpoint and the first inputs of the first and second triggers connected by the second inputs, respectively the first and second outputs of the portioning setter, the first element I, connected by the first and second inputs respectively to the output of the first trig 0 five 0 five Hera and the first output of the second trigger, and T1 network input - to the output of the first one-shot, the second element. And, connected by the first input to the second output of the second trigger, and the second input to the first input of the display unit, with the output of the angle converter - time interval and the fourth input of the first element And, the third element And connected to the first and second inputs, respectively, to the output of the cycle pulse generator and to the output of the third trigger, and the output to the secondary and third inputs of the display unit and to the input of the square pulse generator, the output of the second 1 element I is connected to the first input of the third trigger, the second input of which An initiator pulse output, characterized in that, in order to simplify and increase the reliability of the device, the first element I is connected by an output to the inputs of the first and second single-oscillators, and the first and second inputs of the fourth element I are connected respectively to the output of the second one-shot and with the release of the third trigger.