SU1236321A1 - Automatic weighing machine - Google Patents

Abstract

The invention relates to weighing devices with automatic loading and unloading of weighed doses of cargo. The purpose of the invention is to improve the accuracy and reliability of the device. Before weighing, the initial zero states of both mass sensors 1 and 3 are checked, and only one weighing channel is involved in operational weighing. The second channel is in reserve and replaces the worker only when leaving the last zero source in the last one. Weighing actuators (valves 19 and 20) are turned on when the readings are converted to S (L

Description

The recipients of both channels are diverged by a value σ not exceeding the predetermined value at the setpoint 13 of the difference in the weighting results. Decreasing a given mass difference improves weighing accuracy, and reliability decreases as the invention relates to weighing devices with autolatic loading and unloading of weighed doses of cargo.

The purpose of the invention is to improve the accuracy and reliability of the device.

The drawing shows a block diagram of the device.

The device contains a scale with mass sensor 1, setpoint 2 zero, second mass sensor 3, first converter 4, first comparison element 5, autogenerator 6, second comparison element 7, second converter 8, switch 9, first 10 and second 11 elements AND subtraction element 12, unit 13 for differences in weighing results, control trigger 14, element 15 OR, third element 16 of the comparison for emergency blocking relay 17, third element AND 18, valves 19 and 20 for loading and unloading, respectively.

The device works as follows.

The measuring signal from the mass sensors 1 and 3, respectively, goes to the working inputs of the converters 4 and 8, from the outputs of which they are fed in the same type to both inputs of the switch 9. From the output of the switch 9, one of these signals is fed to the first input of the control trigger 14, which includes with its outputs a valve 19 load or discharge valve 20,

In order to set the zone of acceptable zero-state departure, a zero zero driver 2 is used, from which output the reference signal is fed to comparison elements 5 and 7, where it is compared with the control signals of both converters 4 and 8. The negative result of the comparison (signal No) includes via element probability of increasing the obtained mass difference by. compared with the target and subsequent weighing lockout. If the value of the specified mass difference increases, the weighing accuracy deteriorates and the reliability increases, 1 sludge.

2

You are And 10 and 11 and the element OR 15 of the relay 17, which switches the weighing channel in the switch 9 and blocks in the trigger 14 the control signals of the keyboard 5 loading panels 19 and unloading 20. A positive comparison result (signal Yes) from the output of the comparison elements 5 and 7 enables operation of converters 4 and 8.

O The control signals of both transducers 4 and 8 are fed to subtraction elements 12, from where the result of the difference arrives at element 16 and is compared there with the reference

5 by the signal of the allowable difference, taken from the setpoint 13 of the difference in the weighing results. The negative comparison result (signal No) switches AND 18 and OR 15 to Re0 17 through the elements, which, as before, switches the weighing channel in switch 9 and blocks, in trigger 14, control signals for loading valves 19 and unloading 20.

5 A pulse pulse of the autogenerator 6 appears after unloading the dispenser and calming down its mechanical parts. It analyzes the departure of zero initial states of both weight sensors and at

0 necessary includes the relay 17 emergency lock.

The half-pulse of the oscillator 6 is delayed with respect to the clock pulse at the time of loading.

,; dispenser and calm its mechanical parts Kiix. It compares the magnitude of the mismatch between the two control signals from both converters with the difference specified on the sensor 13, and, if necessary, also turns on the emergency lockout relay 17.

Thus, in the proposed device, before weighing, check your

zero states and 3 masses, and in working

From the initial sensors 1 Г1,., only one weighing channel is involved in the weighing. In this case, the second channel is in reserve and replaces the working channel only when leaving the last zero initial state. The weighing actuators (valves 19 and 20) are turned on only when the readings of the converters of both channels, working and backup, are diverted by an amount not exceeding the set value at the setpoint 12 of the difference between the weighting results. By reducing the specified mass difference, the accuracy of weighing is increased, and the reliability of the device decreases as the probability of the obtained mass difference increases compared to the specified and subsequent weighing blocking. As the value of the specified mass difference increases, the accuracy of weighing deteriorates, and the reliability of the device increases, as the likelihood increases when the values of the initial states in both channels do not exceed the specified mass difference when the working channel is switched to the active one.

Formula and gain

Automatic dispenser containing

scales with a mass sensor, a converter, an autogenerator, a control trigger, loading and unloading valves, the mass sensor is connected to the working input of the converter, the clock input of which is connected to the output of the autogenerator, and the output of the converter is connected to the first input of the control trigger, the second input of which is connected to the output the autogenerator, and each of the two outputs of the control trigger is connected, respectively, with the loading and unloading valves, of which it is

To increase the accuracy and reliability of the metering device, a second mass sensor, different in type from the first sensor, the second converter, the first, second and third elements of the comparison, the zero setting device, the differential pressure sensor are entered into it.

Order 3080/44 Edition 705

Random polygons Avenue, Uzhhorots, st. Project, 4

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These are the weighing results, the first, second and third elements AND, the switch, the subtraction element, the OR element and the blocking alarm relay, and the enable input of the first converter is connected to the output Yes First. The first comparison input, the first input of which is connected to the control output of the first converter and the first input of the subtraction element, the working output of the first converter is connected to the first input of the switch, the second input of which is connected to the working output of the second converter, the test output of which is connected to the second input of the subtraction element and with the second input of the second reference element, the output of which is Yes connected to the enabling input of the second converter, the working input of which is connected to the output of the second sensor m assy, the second input of the first comparison element is connected to the first output of the zero setting device, the second output of which is connected to the first input of the second comparison element, the output of which is not connected to the second input of the second element AND, the code of which is connected to the second input of the OR element, the first input of which is connected to the output of the first element And, the first input of which is connected to the output No first comparison element, the output of the subtraction element is connected to the first input of the third comparison element, the second input of which is connected to the output of the reference ka difference in weighing results, output No third comparison element is connected to the second input of the third element And, the first input of which is connected to the half output of the autogenerator, the clock output of which is connected to the clock input of the second converter, the second input of the first element And, and the first input of the second element And, output the third element And is connected to the third input of the element}) that OR, the output of which is connected to the input of the emergency lock relay, the first output of which is connected to the blocking input of the switch, the output of which It is connected to the first control trigger input, blocking1, and its input is connected to the second output of the emergency blocking relay.

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Claims (1)

Claim An automatic dispenser comprising a balance with a mass sensor, a converter, a self-oscillator, a control trigger, loading and unloading valves, the mass sensor being connected to the working input of the converter, a clock input of which is connected to the output of the oscillator, and the output of the converter is connected to the first input of the control trigger, the second input which is connected to the output of the oscillator, and each of the two inputs of the control trigger is connected, respectively, to the loading and unloading valves, characterized in that, in order to increase accuracy and reliability of the dispenser, a second mass sensor, different in type from the first sensor, a second transducer, first, second and third comparison elements, a zero adjuster, a difference adjuster for weighing results, the first, second and third AND elements, a switch, an element is introduced into it a subtraction, an OR element and an emergency blocking relay, wherein the enable input of the first converter is connected to the Yes output of the first comparison element, the first input of which is connected to the control output of the first converter and is subtracted from the first input of the element I, the working output of the first converter is connected to the first input of the switch, the second input of which is connected to the working output of the second converter, the control output of which is connected to the second input of the subtraction element and to the second input of the second comparison element, the output of which is connected to the enabling input of the second converter, the input of which is connected to the output of the second mass sensor, the second input of the first comparison element is connected to the first output of the zero adjuster, the second output of which is connected to the first input of the second th comparison element, the output of which is not connected to the second input of the second AND element, whose output is connected to the second input of the OR element, whose first input is connected to the output of the first AND element, whose first input is connected to the output There is no first comparison element, the output * of the subtraction element is connected with the first input of the third comparison element, the second input of which is connected to the output of the setter of the difference of the weighing results, the output No the third comparison element is connected with the second input of the third element And, the first input of which connected to a half-cycle output of the oscillator, the clock output of which is connected to the clock input of the second converter, the second input of the first element And and the first input of the second element And, the output of the third element And is connected to the third input of the OR element, the output of which is connected to the input of the emergency blocking relay, the first the output of which is connected to the blocking input of the switch, the output of which is connected to the first input of the control trigger, the blocking input of which is connected to the second output of the emergency blocking relay. VNIIIPI Order 3080/44 Circulation 705 ___ Subscription Custom polygr. ave, city of Uzhhorod, st. Project, 4