SU838362A1 - Automatic batchmeter - Google Patents

Description

(54) AUTOMATIC DISPENSER

13 I y

The image-ogrenging to instrumentation, namely, devices for automatic dosing of liquid media.

There are known automatic dispensers containing, a flow meter (quantity), a valve, a control circuit, and a punched card device.

The disadvantage of such automatic dispensers is the complexity and low: reliability due to the presence of an electromechanical punched card software device, as well as the difficulty of controlling the dispenser directly from the computer.

Closest to the present invention is an automatic metering device comprising a flow meter, an analog-digital converter, a meter with a dose setter, a control circuit and a valve, and a flow meter is installed in series with the valve, with its transducer connected to the analog-digital converter, and the meter inputs and output are connected to the setter zone, the output of the analog-digital converter to the control circuit pT.

A disadvantage of the known device is the inability to control (by the operator or a computer) the efficiency of the dispenser and the dose value entered into the dispenser directly from the computer. This reduces the reliability of dosing and slows down the use of the dispenser in the ACS of THL.

The purpose of the invention is to increase the reliability of the automatic dispenser and expand its functionality by introducing control

dose values.

The goal is achieved by

Claims (2)

that a controlled generator and two switching devices are inserted into the automatic metering unit, with one switching device connected to the flow meter output and meter input, the second KOTqjoro input is connected to the generator output, the generator start input is connected to the control circuit, and the generator stop input is with the output of the control circuit, which is connected to the valve through the second switching device. The dispenser has two modes of operation: dispensing and control. In the dosing mode, the number of pulses in the frequency output signal of the flow meter is compared with the dose value entered in the meter and the valve through the control circuit locks the valve. In the control mode, the counter in the counter of the number of pulses from the controlled generator is compared with the dose value and the generator is locked with a signal similar to the valve control signal. The number in the counter is equal to the dose value and can serve as a criterion for the performance of the metering circuit. Both switching devices serve to prevent work on the ras of the meter and valve when controlling the pa dispenser. The drawing shows a structural diagram of the proposed dispenser. The automatic metering device contains a flow meter D connected through a switching device 2 to a counter 3 with a setting 4 doses, a controlled generator 5, a control circuit 6, a switching device 7 and a valve 8 installed in the pipeline of the Dosing material. The dispenser works as follows. After the start of metering, the output frequency signal of the flow meter 1 through the switching device 2 enters the counter 3, the limit number and which determines the unit 4 dose. The controlled generator 5 is stopped and does not affect the operation of the device. When the counter reaches the limit from its output, the control circuit 6 receives a signal which, after shaping and amplifying through switching device 7, closes gate 8. In control mode, both switching devices are open. The control circuit 6 starts the controlled generator 5, the pulses of which are counted by the counter 3. When the counter 3 reaches the limit number determined by the unit 4 dose, a signal is received from the output of the counter 3 to the control circuit 6. The generated and amplified signal from the output of the control circuit 6 locks the controlled generator 5. The health of the dose and the dose value entered in the 4 dose setting unit are judged by the number set in the 3 meter, which should be equal to the specified dose value. For a fixed frequency of the controlled oscillator 5, the control indicator can also be the duration of the time interval between the start and stop of the controlled oscillator. At the same time, the entered dose value can be found by the formula N-f-t, where N is the entered dose value, units; f is the frequency of the controlled oscillator, Hz; t is the duration of the operation interval of the controlled generator, p. For convenience of monitoring, the state of the counter 3 can be indicated, for example, on a digital indicator connected to it or in an automated process control system. The proposed device provides an increase in the reliability of metering and the monitoring of the health of the main nodes (counter, dose setter, control circuit). The invention includes an automatic metering device containing a flow meter, a meter with a dose setter, connected to a control circuit, and a valve installed on the pipeline of the dosing material, characterized in that, in order to increase reliability and expand functionality, a control generator is introduced into it and two switching devices, with one switching device connected to the output of the flowmeter p1 and the counter input, the second input of which is connected to the output of the controlled generator, the generator start input is connected to the control circuit, and the generator stop input to the output of the control circuit, which is connected to the valve through the switched switching device. Sources of information taken into account in the examination 1.US Patent Nb 3629858, cl. 34O-172, 1971. 2. Avtorskoe svidegelsgvo USSR № 468095, class, Q 01 F 11 / OO, 1973 (prototype).