SU934234A1

SU934234A1 - Continuous-action batchmeter

Info

Publication number: SU934234A1
Application number: SU802943606A
Authority: SU
Inventors: Александр Сергеевич Ерошкин; Геннадий Филиппович Алексеев; Юрий Александрович Трещев
Original assignee: Научно-Исследовательский И Конструкторский Институт Испытательных Машин,Приборов И Средств Измерения Масс
Priority date: 1980-06-23
Filing date: 1980-06-23
Publication date: 1982-06-07

Description

(54) ДОЗАТОР НЕПРЕРЫВНОГО ДЕЙСТВИЯ(54) CONTINUOUS ACTION DISPENSER

1one

Изобретение относитс к весодозирующей технике и может быть использовано при непрерывной весовом дозировании сыпучих материалов в различных отрасл х промышленности.This invention relates to a weight dosing technique and can be used in continuous weight dosing of bulk materials in various industries.

Известен весовой дозатор непрерывного 5 действи , содержаший загрузочное устройство , питатель с приводом, задатчик производительности , регул тор и измеритель расхода массы, выполненный в виде единичной роликоопоры, размещенной прд транспортер- Q ной лентой питател и опирающейс на силоизмерительный преобразователь, выход которого соединен с одним из входов множительного устройства, второй вход которого соединен с выходом датчика скорости, при этом выход множительного устройства .сое- 15 динен с одним из входов элемента сравнени регул тора, второй вход которого соединен с выходом задатчика производительности, а выход - с приводом питател 1.A known weigher of continuous 5 action, containing a loading device, a feeder with a drive, a performance adjuster, a controller and a mass flow meter, made in the form of a single roller support placed by a conveyor belt of the feeder and based on a force-measuring converter, the output of which is connected to one from the inputs of the multiplying device, the second input of which is connected to the output of the speed sensor, while the output of the multiplying device. 15 is connected to one of the inputs of the comparison element Str torus, a second input coupled to an output performance setpoint, and an output - with a feeder drive 1.

Наиболее близким по технической сущ- 20 ности к предлагаемому вл етс дозатор непрерывного действи , содержащий загрузочное устройство, питатель с приводом, измеритель расхода массы, выход которого соединен с входом вычитани элемента сравнени , задатчик производительности, св занный через суммирующий вход элемента сравнени с входом регул тора, выход которого св зан с приводом питател 2.The closest in technical essence to the present invention is a continuous dispenser containing a loading device, a powered feeder, a mass flow meter, the output of which is connected to the subtraction input of the reference element, a performance adjuster connected via the summing input of the comparison element to the regulator input. torus, the output of which is associated with the actuator drive 2.

Недостатком известных дозаторов вл етс сравнительно низка точность дозирова-. ни материалов, обусловленна транспортным запаздыванием между питателем и устройством измерени расхода массы, а также инерционность привода питател и устройства измерени расхода массы.A disadvantage of the known dispensers is the relatively low dosage accuracy. neither materials, due to the transport delay between the feeder and the mass flow measurement device, as well as the inertia of the drive of the feeder and the mass flow measurement device.

Цель изобретени - повышение точности дозировани за счет исключени вли ни запаздывани , обусловленного транспортной задержкой материала и инерционностью отдельных элементов контура управлени .The purpose of the invention is to improve the accuracy of dosing due to the elimination of the influence of the delay caused by the transport delay of the material and the inertia of individual elements of the control loop.

Claims

This goal is achieved by the fact that the metering device is equipped with an adder, a constant delay unit and a filtering unit, the input of which is connected to the regulator output, and the output is connected to the input of the constant delay unit, and a summing input of the adder, the second input of which is subtracted to the output of the unit constant lag, and the output is connected to the second subtraction input of the reference element. The drawing shows schematically the proposed device. The continuous dispenser has a hopper 1 mounted above the feeder with a drive 2, a mass flow meter 3 whose output is connected to the subtraction input of the comparison element 4, a setpoint controller 5 connected through the summing input of the comparison element 4 the input of the regulator 6, the output of which is connected to the drive of the feeder 2 and the input of the filtering unit 7, the output of which is connected to the input of the constant delay unit 8, the output of which is connected to the subtraction input of the adder 9, The second summing input of which is connected to the output of the filtering unit 7, and the output to the second input of the subtraction of the comparison element 4. The dispenser works as follows. The bulk material from the hopper 1 is iodized by the feeder 2. The current value of the weight flow at the exit of the feeder 2 is measured by the device 3 and compared in the comparison element 4 with the set value of the flow rate set on the setting unit 5. In the steady state mode of operation of the metering unit, the output value of the performance sensor 5 supplied to the Summing input of the comparison element 4 is equal to the output value of the mass flow meter 3 supplied to the subtraction input of the comparison element 4, while the output from the output of the adder 9 of the comparison element 4 receives the signal equal to "zero. In the event of a deviation in the measured value of the mass flow from the comparison element 4 specified from the output, the signal proportional to this deviation is received at the input of the regulator 6. The controller b generates a control action aimed at eliminating the deviation, which simultaneously enters the input of the drive of the feeder 2, changes the mass flow rate of the material at the dispenser's output, is proportional to the change of the control action during the transport lag time and at the input of the filtering unit 7 and further on the input of the adder 9. At the output of the adder 9, a signal different from the "zero" appears, which is fed to the second input of the subtraction of the comparison element 4 and eliminates its output signal in a time significantly less transport latency. In this case, a new value of the control action that is established at the output of the controller b ensures, after a time equal to the transport lag time, the flow rate equal to the specified one. At a time equal to the transport delay time, the subtraction input of the adder 9 through the constant delay unit 8 receives a signal equal to the signal at the summing input of the adder 7. At the output of the adder 9, the signal takes a zero value and the signal at the output of the mass flow meter 3 equal to the output signal of the setting device 5 performance. The absence of the proposed device leads to the fact that when a deviation occurs at the output of the comparison element 4, the signal at the output of the regulator 6 changes during the entire time of the transport delay, after which it turns out to be more or less than the required value; which, in turn, leads to the emergence of new metering errors, the invention The continuous dispenser containing a loading device, a feeder with a drive, a mass flow meter, the output of which is connected to the subtraction input of the reference element, a setpoint controller, connected through the summing input of the comparison element an input of a regulator, the output of which is associated with a drive of the feeder, characterized in that, in order to increase the accuracy of dosing, it is equipped with an adder, a block of constant delay and a block m filter, whose input is connected to the output of the controller, and output - with an input unit constant lag and summing adder input, a second input of the subtractor is connected svyhodom blo constant lag, and an output coupled to the second input of the subtractor comparing element. Sources of information taken into account in the examination 1. A. Eroshkin et al. Analysis of the control system of a continuous dispenser of the type KDN - Kauchuk and Rubber, 1972, No. 10, p. 44.

2. Halperin, F. S. [Main trends in the development of weighers of continuous action]. M., TsNIITEIpriborostroeni, 1977, p. 10 (prototype).