RU2473050C1 - Apparatus for feeding floatation agents - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: apparatus has a pressure tank, a unit for controlling metering valves with period T, equipped with an information transmitting and receiving channel, N feed channels, a device for measuring flow of reagents at the inlet of the pressure tank and a computing device, the input of which is connected to the output signal of the device for measuring flow of reagents, and information transmitting and receiving channels of the computing device and the unit for controlling metering valves are mutually connected. In order to determine faults in the metering valves and the pressure tank, the computing device, by integrating the output signal of the device for measuring flow of reagents, calculates the flow rate of the reagent over a time which is a multiple of the period T, and compares the obtained flow rate with the total flow rate of the reagent established in the channels of the unit for controlling metering valves. Said procedure can be realised continuously for the entire feeding period. When the flow rate of the reagent deviates from the allowable value, an algorithm for searching for the faulty equipment - feed channel or pressure tank - is executed.

EFFECT: possibility of automatic calibration of reagent feed channels.

3 cl, 1 dwg

Description

The present invention relates to the field of automation of production processes, in particular to devices for dispensing liquid flotation reagents during flotation of non-ferrous metal ores.

A device [1] for dispensing reagents is known, comprising a pressure tank, metering valves, N control channels for metering valves, each of which contains a timer, logic elements and amplifier. The disadvantage of the device [1] are low reliability and limited functionality.

A device [2] is known, comprising a pressure tank, N dispensing channels, each of which contains a metering valve, as well as a microprocessor control unit for metering valves, equipped with a common program consisting of program blocks that provide:

- the formation of control signals by metering valves,

- creation of a database of catastrophic failures of dispensing channels,

- accounting for the specified costs of reagents for each channel.

The disadvantage of the device [2] is the lack of control of the actual reagent consumption through the metering channels, the control of parametric failures of the metering valves, the control of the pressure tank, and the lack of automatic calibration of the metering valves.

The closest in technical essence and the achieved technical effect - the prototype of the proposed device is a device [2].

The objective of the invention is to expand the functionality of the device - the addition of the device with the functions of the calibration of the metering channels, the identification of parametric failures of the metering valves and pressure tank. For this purpose, a reagent flow meter at the inlet of the pressure tank is introduced into the device [2], in which the first and second float valves are additionally installed, a computing device equipped with program blocks:

- calibration of dosing channels,

- comparing the current flow rate of the reagent with the flow rate specified in the metering valve control unit,

- algorithm for finding faulty equipment,

- receiving and transmitting information between the computing device and the metering valve control unit.

Figure 1 shows a block diagram of the proposed device, which shows:

1 - meter reagent consumption,

1.1 - input fitting

1.2 - output fitting

2 - pressure tank, including the first and second float valves

3 - reagent,

4 - the first float,

5 - the first locking device

6 - rod of the second float valve,

7 - throttle fitting,

8 - second locking device

9 - the second float,

10 - dosing channels,

11 - metering valves,

12 - control unit metering valves, including a first computing device,

12.1 - display,

12.2 - keyboard,

13 - channel transmission of information,

14 is a second computing device,

14.0 - a common software unit of a computing device,

14.1 - software block calibration of the metering channels,

14.2 - program unit for calculating the deviation of the input and predetermined reagent consumption,

14.3 - software block search algorithm for faulty equipment,

14.4. - software unit for receiving / transmitting information,

14.5. - a software unit for inputting a signal of a reagent flow meter,

15 is a channel for receiving information from a reagent flow meter.

The first float 4 and the first shut-off device 5 are the first shut-off valve. The second float 9, the second shut-off device 8 and the rod of the second float valve are the second shut-off valve. The proposed device operates as follows.

Under the control of a block 12, containing N channels for the formation of control actions in the form of PWM signals with a period T, the metering valves 11 are turned on for a certain time. In this case, the dose of reagent flowing from the metering valve is proportional to the duration of the on state of the valve during period T at a constant value of the level of reagent in the pressure tank.

The regulation of the level of reagent 3 in the supply tank is as follows. When reducing the level of reagent 3 in the pressure tank 2, the first locking device 5, located at the end of the first float 4, opens the outlet fitting 1.2 of the meter of the flow of reagent 1 and the level of reagent 3 in the pressure tank is restored. When reducing the output stream of reagent 3, the first float 4 rises, blocking the outlet fitting 1.2, and the level of reagent 3 is restored. The float valve containing the rod 6, the locking device 8 and the float 9, when the level of the reagent 3 in the pressure tank increases, the throttle fitting 7 closes and the pressure in the flow tank 2 increases, which causes an increase in the input flow rate of the reagent 3. The flow meter of the reagent 1 transmits this information to a computing device, and the program unit 14.2 calculates the magnitude of the current input stream of the reagent 3 meter 1 for a time multiple of period T, and a given total consumption of reagent 3 in the metering channels, and transmits by redstvom total program block in the program block 14.0 14.3 the algorithm that implements the search for faulty equipment. The program block 14.4 implements an algorithm for receiving and transmitting information between blocks 12 and 14. The program block 14.5 implements an algorithm for receiving information from the meter 1 of the reagent flow through the channel for receiving information from the meter of the reagent flow 15.

For the normal functioning of the proposed device, you must first perform the following operations:

- calibration of dosage channels 10,

- set the period T of the block 12 control the metering valves 11,

- set the flow rate in the metering channels 10.

The calibration mode of the metering valves 11 is implemented by the software unit 14.1 according to the following algorithm.

The metering valves 11 of each channel 10 are successively switched on one at a time for a certain time, the flow rate of the reagent 3 is measured during this time, and the second flow rate of the reagent 3 of each dispensing channel is determined. 10. The obtained values of the second flow rate are stored in the control unit of the dispensers 12 and are used in the batching mode.

The period T of the operation of the unit 12 is set by the computing device 14 via the transmit-receive channel 13 or from the keyboard 12.2 of the control unit 12 of the metering valves. The value of the set flow rate of the dispensing channels is controlled by the indicator 12.1 of block 12.

The costs of the reagent 3 for each batching channel 10 are set by setting as a percentage of the maximum consumption of the reagent 3 in each batching channel 10 via the transmit-receive channel 13 or the keyboard 12.2.

Thus, the proposed device, in contrast to the prototype, provides the formation of a database:

- malfunctions of the metering valves 11,

- malfunction of the pressure tank 2,

- reduction of the input stream of the reagent 3 below the permissible.

The determination of the reason for the deviation of the given total reagent 3 flow rate from the real one is also determined by continuous monitoring of the signal of the reagent 1 flow meter and the current total set reagent flow rate 3 set in the metering valve control unit.

Thus, the proposed device in comparison with the prototype has distinctive properties, namely, it performs automatic calibration of the metering valves 11, monitors the parametric failures of the metering channels 10, monitors the failures of the pressure tank 2, controls the flow of reagent 3 entering the pressure tank 2. This achieved by the fact that new elements and software are introduced into the device, and new connections between the elements of the device.

The proposed device implements the criteria of the invention, namely, introduced new elements and the relationship between them, introduced new program blocks. The device is used in the automation of technological processes of flotation.

Literature

1. RF patent 2184388, G05D 11/13, BI No. 18, 27.6.02.

2. RF patent 2270980, G05D 11/13, BI No. 6, 02.22.06.

Claims (3)

1. A device for dispensing flotation reagents containing a pressure tank, N identical dispensing channels, each of which contains dispensing valves, a control unit for dispensing valves, equipped with a first computing device and a channel for receiving and transmitting information, operating periodically with a set period T, characterized in that a pressure tank equipped with the first and second float valves is inserted into the device, a reagent flow meter installed at the inlet of the pressure tank, and a second computer e device equipped with a program unit for calibrating the metering channels, a program unit for calculating the deviations of the input reagent flow rate over a multiple number of periods T from the total reagent flow rate set in the metering valve control unit for the same time, a program unit that implements an algorithm for determining the malfunction of the metering valves and pressure tank, a program block of a channel for receiving and transmitting information and a program block for receiving information from a reagent flow meter. 2. The device according to claim 1, characterized in that the output signal of the reagent flow meter is connected to the input of the computing device, and the output channel for receiving and transmitting information of the computing device is connected to the output channel for receiving and transmitting information of the metering valve control unit. 3. The device according to claim 1, characterized in that the float valve is placed in the pressure tank in the form of a rod, to which a locking device is attached, and a float is attached to one end of the rod, and the other is withdrawn from the pressure tank through the throttle fitting.