RU2337326C2 - Device for metering of liquid reagents (versions) - Google Patents

Abstract

FIELD: technological process.

SUBSTANCE: in device with two fly gates that have controlling inlets with measuring vessel and piston that freely moves inside, according to invention, controlled frequency generator is introduced with direct and inverse outlets, at that direct and inverse controlling inlets of fly gates are accordingly connected to controlling outlets of frequency generator, which is connected to frequency setter. During operation measuring vessel is filled and emptied at the same time, and frequency of this process and measuring vessel capacity determine reagent flow rate.

EFFECT: higher accuracy and efficiency of metering.

4 cl, 7 dwg

Description

The invention relates to the field of dispensing liquids in the process and can be used in processing plants for flotation of non-ferrous metals, in the chemical, metallurgical and other industries.

A known device for dispensing liquid reagents PRI-1 [1], controlled by a periodic frequency signal, containing a shut-off valve, actuated by an electromagnet. The current reagent flow rate is determined by the valve’s open state during the period, valve response rate and reagent pressure at the inlet of the shutoff valve. The disadvantage of the device [1] is the low metering accuracy due to the dependence of the current flow through the valve on the change in reagent pressure at its inlet.

A device for dispensing flotation reagents PRM-2 [2], containing a measuring vessel with a measuring tube, connected by an inlet pipe with a flap valve controlled by an electromagnet, and an outlet pipe, which is the output of the device. The measuring vessel in the device [2] is filled from the supply tank under pressure, and merges into the process by gravity, therefore, the time of reagent discharge from the measuring vessel is significantly longer than the time of filling the measuring vessel. The device [2] has poor performance.

The prototype of the invention is a device [2].

The proposed device (option 1) is shown in figure 1. Figure 2 shows the plot of the signals at the corresponding points of the device. Figure 1 and 2 are given the following notation:

1 - supply tank

2 - liquid reagent,

3 - adjustable valve

4 - the first changeover valve [3],

4.0 - device input, input / output,

4.1 - the first input / output of the changeover valve,

4.2 - the second input / output of the first changeover valve,

4.3 - control input of the first changeover valve,

5 - measuring vessel,

6 - direction of movement of even doses of the reagent,

7 - direction of movement of odd doses of the reagent,

8 - the first end of the measuring vessel,

9 - the second end of the measuring vessel,

10 - freely movable piston,

11 - the first locking device

12 - second locking device

13 - the first input / output of the measuring vessel,

14 - the second input / output of the measuring vessel,

15 - the second changeover valve

15.0 - device output, input / output,

15.1 - the first input / output of the second changeover valve,

15.2 - the second input / output of the second changeover valve,

15.3 - control input of the second changeover valve,

16 is a first node connecting pipelines,

17 - the second node connecting pipelines,

18 - frequency generator,

18.1 - direct output of the frequency generator,

18.2 - inverse output of the frequency generator,

19 - setter,

19.1 - setpoint output,

20 - voltage at the control input of the first changeover valve,

21 - voltage at the control input of the second changeover valve,

22 - dose of reagent equal to the volume of the measuring vessel.

A device for dispensing liquid reagents (option 1) works as follows. The reagent enters the input of the first changeover valve 4, and enters the process from the second changeover valve 15, which are the inlet and outlet valves of the device, respectively. When the adjustable valve 3 is opened, reagent 2 from the pressure tank 1 enters the input 4.0 of the first changeover valve 4. For definiteness, we assume that at this moment a control signal is supplied to the control input 4.3 of the changeover valve 4, which ensures that the input 4.0 is connected to the first input / output 4.1 of the first cross over valve. At this moment, a control signal 15.3 of the second changeover valve 15 is connected to the output of the device 15.0 with the second input / output 15.2 of the second changeover valve 15. Therefore, the freely moving piston 10 in the measuring vessel moves from the first end 8 of the measuring tank 5 to the second end 9 measuring capacity, and the reagent comes from the input of the device 4.0 to its output 15.0 at the input / output 4.1 of the first changeover valve 4, the first node connecting pipelines 16, the first input / output 13 of the measuring vessel, measuring vessel 5, the second input / output 14 measuring vessel, the second node connecting pipelines 17, the second input / output 15.2 of the second changeover valve 15. When the freely movable piston 10 reaches the second end 9 of the measuring vessel 5, the second locking device 12 blocks the second input / output 14 of the measuring vessel 5, and the reagent duct stops, and the freely moving piston 10 remains in this state until the control signals at the control inputs 4.3 and 15.3 of the changeover valves 4 and 15 are reversed. After that, the freely movable piston 10 passes from the second end 9 to the first end 8 of the measuring tank 5, and the reagent enters from the input of the device 4.0 to its output 15.0 through the circuit: the second input / output of the first changeover valve 4, the second node of the pipe connection 17, the second input / output 14 of the measuring vessel 5, measuring vessel 5, the first input / output 13 of the measuring vessel 5, the first node connecting pipelines 16, the first input / output 15.1 of the second changeover valve 15. When the freely moving piston 10 reaches the first end 8 of the measuring tank 5, the first shut-off device 11 closes the reagent flow for the time until the next change in the control signals supplied to the control inputs 4.3 and 15.3 from the outputs 18.1 and 18.2 of the frequency generator 18. Next, the dosing cycle is repeated.

The current value of the flow rate Qtec is determined by the expression Qtec = 2Vo · F, where Vo is the volume of the measuring vessel, F is the frequency of the generator. The output frequency 18.1 (18.2) of the frequency generator 18 is set by the signal from the output 19.1 of the setter 19.

Thus, for each period T, two doses of reagent 22 are received at the output of the device, while the dose volume is equal to the volume Vo of the measured capacity. To reduce the current consumption of the reagent, the frequency of doses 22 is changed by changing the output signal of the setter 19. Thus, in one period of the generator frequency, the volume of the reagent 2Vo enters the process regardless of the pressure of the reagent at the input of the device.

Figure 3 (option 2) shows a device for dispensing liquid reagents, in which the frequency of receipt of reduced doses in the process remains constant, but for a period T a volume equal to 2Vo is dosed. Figure 4 shows the signals at the respective outputs of the device and the flow Q of the reagent in the pipelines of the device, namely:

23 - pulse-width signal generator,

23.1 - output signal of the pulse width generator,

24 - the first logical element 2I,

24.1 - output signal of the first logic element 24,

25 - the second logical element 2I,

25.1 - output signal of the second logic element,

26 - the first shut-off valve

26.1 - input of the first shut-off valve,

26.2 - output of the first shut-off valve,

27 - second shut-off valve,

27.0 - control input of the second shut-off valve,

27.1 - input of the second shut-off valve,

27.2 - output of the second shut-off valve,

28 - output device dispensing.

A device for dispensing liquid reagents (option 2) works as follows. The frequency generator 18 and the pulse width generator 23 having a constant output frequency are connected to the output of the master 19 by the control inputs. Moreover, the output of the master 19, which increases the frequency of the generator 18, proportionally increases the pulse width (duration) of the pulse width generator 23.

For definiteness, we assume that when voltage is supplied to the control input 4.3 of the first changeover valve 4, its input 4.0 is connected to the first line 4.1 of the first changeover valve 4. The signal 18.1 is permissive for the signal from the output 23.1 of the pulse-width signal generator 23. Therefore, from the output 24.1 of the logical element 24 receives signals U23.1 to the control input 27.0 of the shut-off valve 27 and ensure the passage of doses of reagent ΔQ27 to the output 28 of the dispensing device. For a time less than or equal to half the period of the signal of the frequency generator 18, the freely moving piston 10 reaches the second end 9 of the measuring vessel. At the end of the control signal at the control input 4.3, the input 4.0 of the device is connected to the second input / output 4.2 of the first changeover valve 4. At the same time, an enable signal from the inverse output 18.2 appears, which is fed to the input of the second logic element 2I 25. The first shut-off valve 26 the control signal U25.1 supplied to the input of the first shut-off valve 26, ensures the passage of doses ΔQ26 of the reagent to the output 28 of the device. Further, the dosing cycle is repeated.

Thus, the device for dispensing liquid reagents ensures the flow of reagent with a constant frequency into the technological process in doses reduced in comparison with the capacity of the measuring vessel, which is one of the useful properties of the device for dispensing liquid reagents.

Figure 5 shows a device for dispensing liquid reagents (option 3), in which fixed doses of volume Vo arrive at the second inlet / outlet 4.2, which is the outlet of the device, under pressure determined by the pressure of the air supplied to the first inlet / outlet 15.1 of the second changeover valve fifteen.

A device for dispensing liquid reagents (option 3) works as follows.

Upon receipt of the control signal from the direct output of the frequency generator 18 to the control input 4.3 of the first changeover valve 4, the first input / output of the first changeover valve 4.1 is connected to the input / output 4.0 of the first changeover valve 4. Simultaneously, the second input / output 15.2 of the second changeover valve 15 is connected to the input / output 15.0 of the second flap valve, and the freely moving piston 10 moves to the second end 9 of the measuring tank 5. Upon reaching the freely moving piston 10 of the end 9, the measuring tank 5 is filled with reagent, two the pressure of the freely moving piston 10 is stopped, and the dose of reagent equal to the capacity of the measuring vessel 5 is ready to be forwarded to the process. When the control signals at the outputs 18.1 and 18.2 change to the opposite of the first 4 and second 15, the change-over valves go into opposite states. In this case, the input / output 4.0 of the first changeover valve is connected to the second input / output 4.2 of the first changeover valve 4, and the first input / output 15.1 of the second changeover valve 15 is connected to the line 15.0 of the second changeover valve 15 and the freely movable piston 10 moves to the first under air pressure the end face 8 of the measuring tank 5, while the output of the device under pressure receives a dose of Q4.2, equal to the volume of the measuring tank 5. Current flow rate Edema. reagent is determined by the expression Qtec = Vo · F. Further, the dosing cycle is repeated.

Figure 7 shows a device for dispensing liquid reagents (option 4) based on normally closed valves. Normally closed valves 29, 30, 31 and 32 are connected into the device, connected according to the “bridge circuit” (by analogy with the diode “bridge” in electrical engineering), forming two diagonals AB and CD. The diagonal AB is the input / output of the liquid dosing device, the inputs / outputs 13 and 14 of the measuring vessel 5 are connected to the diagonal CD. The control inputs of the normally closed valves 29, 32 and 30, 31 are paired and connected to the direct 18.1 and inverse 18.2 outputs of the frequency generator eighteen.

A device for dispensing liquid reagents (option 4) works as follows.

For definiteness, we assume that from the direct output of the frequency generator 18 to the combined control inputs 29.1 and 32.1 of the normally closed valves 29 and 32, a control signal is received that ensures the opening of the normally closed valves 29 and 32. In this case, the reagent flows from the device input along the following path: device input A, normally closed valve 29, measured capacity 5, normally closed valve 32, device output B. When the freely moving piston 10 reaches the second end 9 of the measuring tank 5, the reagent at the output B stops flowing. When changing the control signals at the outputs 18.1 and 18.2 of the frequency generator 18 to the opposite direction, the passage of the reagent to the device output B is carried out along the path: input A of the metering device, normally closed valve 31, measuring vessel 5, normally closed valve 32, output B of the device. The receipt of the reagent at exit B stops when the freely moving piston 10 reaches the first end 8 of the measuring tank 5. Next, the dosing cycle is repeated.

The proposed technical solution is new, as it includes a set of new essential features with the corresponding connections between the elements, namely: new elements and connections are introduced - the first and second flapper valves, a measuring vessel equipped with a freely movable piston, the first and second locking devices, a controlled generator pulse-width signal, master, two logic elements 2I, and the inputs of the rocker valves connected to the outputs of the logic elements 2I, the connection of the second rocker valve with the source chnikom air under increased pressure, and in one embodiment of the dispensing device introduced "bridge" circuit, normally closed valves and their communication with the controlled frequency generator.

The specified set of new essential features allows you to take an inventive step and get a positive effect, which consists in expanding the functionality of the dispensers of liquid reagents. The present invention is industrially applicable for automatic dosing of liquid reagents during flotation of non-ferrous metal ores, in other cases, dosing of liquid reagents in the chemical and construction industries.

Literature

1. Fundamentals of Metallurgy, Volume VI, Moscow, Publishing House Metallurgy, 1973, p. 185.

2. Fundamentals of Metallurgy, Volume VI, Moscow, ed. Metallurgy, 1973, p. 182.

3. Catalog of the company CAMOZZI, 2004-2005, p. 02.02 / 001.

Claims (4)

1. A device for dispensing liquid reagents, comprising a supply tank, an adjustable valve, pipelines, a measuring vessel equipped with inlet and outlet, inlet and outlet solenoid valves and a control device, characterized in that a frequency generator with a control input, direct and inverse, is introduced into it outputs, master, inlet and outlet valves made of first and second flap valves, each of which is equipped with an input, first and second outputs, and the first outputs of the flap valves and the second outputs are not ekidnyh valves share a common conduit, formed in the two assemblies pipe connections mounted measuring vessel, equipped with a freely movable piston with two locking devices, wherein the control inputs of the changeover valve are respectively connected to the direct and inverse outputs of the frequency generator, which control input connected to the output setpoint. 2. The device according to claim 1, characterized in that the second flip solenoid valve is made of the first and second shut-off valves equipped with control inputs, the first and second logic elements 2I are introduced, the outputs connected to the control inputs of the first and second shut-off valves, respectively, the first the inputs of the first and second logic elements 2I are combined and connected to the output input to the device of the pulse-width signal generator, and the second inputs of the first and second logic elements 2I are connected to the impulse and inverse outputs of the frequency generator, respectively, and the inputs of the frequency generator and pulse-width pulse generator are connected to the output of the master. 3. A device for dispensing liquid reagents, containing a measuring vessel equipped with inlet and outlet, inlet and outlet valves, a frequency generator with direct and inverse outputs and a setter, characterized in that the first and second valves are made of the first and second, third and fourth normally closed valves, and the control inputs of the first and third valves are combined and connected to the direct output of the frequency generator, and the control inputs of the second and fourth closed valves are combined and connected to the inverse input of the generator frequency atom. 4. A device for dispensing liquid reagents, containing a supply tank, valve, pipelines, first and second flap valves, a measuring vessel connected to the inputs / outputs of the flap valves, and a frequency generator with direct and inverse outputs, characterized in that it is additionally introduced a pipeline with high pressure air connected to the first output of the second changeover valve, and the second output of the second changeover valve is left free for air to exit.

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