SU1582026A1 - Device for weight portion metering - Google Patents

Abstract

The invention relates to the field of weighing equipment and can be used mainly in automated dosing control systems for various substances intended for further mixing, for example, in the preparation of a composition in the production of synthetic detergents. The device provides a reduction in the dosing error due to the end of the feed with the zero speed of the feeder, as well as the operational accounting of the mass of the excess column of the dosing material by additionally introducing two comparators 13 and 14, three counting blocks 14-16, a time interval former 17 and a switch 18. 1 Il.

Description

The invention relates to weighing technology and can be used in automated dosing control systems for various substances intended for further mixing, for example, in the preparation of a composition in the production of synthetic detergents.

The aim of the invention is to improve the accuracy of the device.

The drawing shows a block diagram of the proposed device.

The device for weighing batch dosing contains a feeder 1, a load receiving unit 2 with a weight sensor 3, a weight measurement unit 4, a control unit 5, a loading speed determination unit 6, a loading speed control unit 7, a loading speed setting unit 8, first and second comparators 9 and 1 0. dose setting unit 11, third and fourth comparators 12 and 13, first, second and third counting units 14-16, time interval generator 17 and switchboard 1 8.

The device works as follows.

Initially, the feeder 3 is switched off and the discharger discharging mode is switched on. When the device is started up, the unloading mode is turned off and the feeder 1 is turned on, from which the dosing substance enters the receiving unit 2. The weight sensor 3 converts the weight of the material in the load receiving unit 2 into the electrical signal supplied to the unit 4 measuring the weight, where indicated, the signal transforms the binary code corresponding to the value of the current weight of the substance being metered. In this case, at the first output, the measurement unit 4 records the code of the weight of the substance in the previous measurement cycle, and at the second output - the code of the current weight of the substance (in the current measurement cycle). According to the signals from the control unit 5, the measurement process is periodically repeated. The measurement burden and its period are selected for reasons of accuracy. The difference between two successive measurements of weight per measurement time is the current load rate VTe (, iЈ, formed at the output

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de node 6 determine the download speed.

From the moment the device starts up (power on), a signal is generated at the third output of control unit 5, which begins the process of integrating the loading rate of the third counting unit 16, as well as counting the time taken by the driver for time interval 17. The control effect on the feeder 1 is supplied from the output of the loading speed control unit 7 and is formed by the difference between the set (from the output of the setpoint 8 loading speed through the switch 18) and the current (from the output of the node 6) loading speeds. When a given loading rate is reached, the output of the fourth comparator 13 generates a signal O, which is used to end the integration process (in the third counting unit 16) and set the count time (shaper 17 of the time interval). As a result, at the output of the block 16, the code of the advance value for the given dosing cycle b is fixed, and at the output of the Shaper 17, the time code for the set of the nominal load rate is set.

The process of loading the material being metered at the nominal (set) speed of the feeder continues to the corresponding command, after which the signal 1 from the output of the second comparator 10 switches the switch 18. At the time of the end of loading (reaching the specified weight P $ ad, flow b), the control effect and speed feeders are zero. In this case, a permitting signal (J at the output of the third comparator) is formed at the first input of the pair comparator, which is also outputted by the feeder J to close the shutter. After the end of the flow of material into the load-bearing unit 2 and calm down the weighing part, the device fulfills the condition

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As a result, at the output of the first comparator 9, a signal 1 is formed, which is supplied to the feeder 1 to open the shutter for dosing the next batch of substance. In addition, on the front of the specified signal, the value of uP-jy.j B is fixed to the first counting unit 14.

Claims (1)

Invention Formula A device for weighing batch dosing, comprising a feeder, a load receiving unit with a weight sensor connected to a weight measuring unit, control units and load rate control units, a loading rate determination unit, two comparators and setting units for loading speed and dose, characterized in that accuracy, it additionally introduces the third and fourth comparators, three counting blocks, a time interval former and a switch, with the output of the load speed setter connected to the first bit in The switch and the first bit inputs of the fourth comparator, the second bit inputs of which are connected to the corresponding bit outputs of the load speed determination node and the bit inputs of the third counting unit and the load speed control unit, the output of which is connected to the inputs of the feeder, and the second bit inputs - with the corresponding bit outputs of the switch, the second bit inputs of which are connected to the corresponding bit outputs of the second counting unit, and the third input - to the output of the second computer arator, the first bit inputs of which are connected to the corresponding outputs of the third counting ten 15 820266 the second bit inputs, with the corresponding outputs of the first counting unit and the first bit inputs of the second counting unit, and the third comparator, the second input of which is connected to the common wire of the device, and the output to the second input of the feeder and the first input of the first comparator, the second bit inputs of which are connected to the corresponding first bit outputs of the weight measuring unit and the first bit inputs of the load speed determination node, the second bit inputs of which are connected to the third bit inputs m of the first comparator, the second bit outputs of the weight measuring unit and the first bit inputs of the first counting unit, the second bit inputs of which are connected to the corresponding outputs of the dose setter, and the third input with the third input of the feeder and the output of the first comparator, the first output of the control unit connected to the second input of the weight measuring unit, the second output - to the third input of the load speed determination node, and the third output - to the first input of the For30 world viewer, and the second input of the third counting unit, the third input of which is connected to the output of the fourth comparator and the second input of the time interval generator, the bit outputs of which are connected to the corresponding second bit inputs of the second subchapter. 20 35 Editor T. Parfenova Order 2081 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Compiled by K. Zhukov Tekhred L. Serdyukova Proofreader T. Malets Circulation 425 Subscription