WO2017024925A1

WO2017024925A1 - Working method for liquid extracting and quantifying device and liquid extracting and quantifying device

Info

Publication number: WO2017024925A1
Application number: PCT/CN2016/090452
Authority: WO
Inventors: 王政军; 周科峰; 肖强
Original assignee: 珠海优特电力科技股份有限公司
Priority date: 2015-08-10
Filing date: 2016-07-19
Publication date: 2017-02-16
Also published as: CN105065912A; CN105065912B

Abstract

Disclosed are a liquid extracting and quantifying device and a working method therefor. The device comprises at least one liquid storage module (1), a pressure regulating module (2), a buffer module (3) and a control module (4). The liquid storage module (1) comprises at least one liquid storage unit (C1), at least one liquid outlet switch (F3) and at least one ventilation switch (F1). The pressure regulating module comprises at least one high negative pressure regulating unit (21) and at least one low negative pressure regulating unit (22). The buffer module comprises a buffer unit, a discharge port of the buffer unit being in communication with a master switch for feeding (F2). The control module (4) is communicatively connected to the liquid storage module (1), the pressure regulating module (2) and the buffer module (3) respectively. A pipeline is pre-extracted with a high negative pressure to discharge air within the pipeline, then the liquid is extracted in a quantified manner with the high negative pressure, and the liquid left within a liquid outlet pipeline is stably extracted with a low negative pressure. The liquid is enabled to be conveyed quickly at first and then steadily during extraction, which effectively improves the service life and reliability of the entire device.

Description

Working method of liquid measuring device and liquid measuring device

Technical field

The invention relates to the technical field of taking quantity of a batching device, in particular to a liquid taking device and a working method thereof.

Background technique

As we all know, it is often necessary to prepare various liquid materials in daily life and industrial production, such as seasoning preparation, drug preparation, and chemical raw material preparation. A simple liquid material preparation task can be dispensed by manually taking the amount of liquid required. For example, in the field of cooking, the chef needs to measure the appropriate oil, soy sauce, vinegar, etc. according to the needs of different dishes. The appropriate amount of these liquid sauces has a great influence on the dishes to be cooked: excessive use of seasonings will be beneficial to human health. Harmful, and the lack of use of spices will affect the taste of the food. At present, with the continuous improvement of the automation level of mechanical equipment, there are many equipments on the market for automatic liquid dispensing. For example, in the field of cooking, there is a cooking equipment with automatic dispensing of liquid ingredients, such as belts. Automatic cooking machines with automatic vinegar and other functions, as well as special ingredient preparation equipment, namely cooking batching machine. For the existing cooking batching equipment, in terms of working principle, a fixed negative pressure value is generally generated by the gas source device, and the liquid ingredients are extracted and quantified.

It has been proved by a large number of experiments and practices that the batching equipment for formulating liquids with a fixed negative pressure value has at least the following disadvantages: the selection of the pressure of the negative pressure is difficult to grasp accurately and is difficult to control. When the negative pressure of the whole liquid reclaiming and dosing device is too small, the liquid condiment is extracted from the liquid bottle by the small negative pressure, the liquid condiment flows relatively slowly in the pipeline, and the liquid passes through the pipeline. There may also be a certain amount of liquid remaining on the inner wall of the pipeline, which affects the accuracy of the amount of liquid extracted. In addition, when the pressure of the suction pressure is preset too large, although the speed of the liquid seasoning is fast, the flow rate of the liquid seasoning in the pipeline is too fast, which causes the liquid seasoning to directly flush into the buffer bottle module of the device. In the middle, the liquid splashes around the walls of the buffer bottle, and even causes the splashed liquid to enter the gas source device that generates the negative pressure along the ventilation pipe.

In summary, in the prior art, the cooking batching machine or the automatic cooking machine absorbs and quantifies the liquid ingredients through a fixed negative pressure value, and there is a problem that the taking quantity is not accurate enough; When the setting is too large, it is easy to damage the air source device, which is not conducive to the entire device. Life and reliability.

Summary of the invention

In view of the above technical problems, the present invention provides a working method of a liquid take-up device and a liquid take-up device, which adopts a stepped negative pressure to realize the absorption and quantification of the liquid, thereby effectively improving the accuracy of the liquid take-up and the life of the entire device. And reliability.

The invention first provides a working method of a liquid take-up device, the method comprising:

Step S10: opening the high negative pressure regulating unit, pre-pumping the pipeline through the high negative pressure generated by the high negative pressure regulating unit, and eliminating the air in the pipeline;

Step S20: opening the liquid discharge switch on the liquid discharge pipe, the opening valve of the liquid storage unit is simultaneously opened; the liquid in the liquid storage unit is pumped to the buffer unit by the high negative pressure generated by the high negative pressure regulating unit; When the predetermined amount is extracted, the liquid discharge switch is turned off;

Step S31: The ventilation switch disposed on the bypass line between the liquid storage unit and the liquid discharge switch is opened, and the opening valve of the liquid storage unit is simultaneously closed; wherein the bypass line is in communication with the atmosphere, and the ventilation switch is opened. Eliminating high negative pressure in the liquid outlet between the liquid storage unit and the liquid outlet switch;

Step S32: Turn off the high vacuum pressure regulating unit;

Step S40: opening the low vacuum pressure regulating unit;

Step S50: opening the liquid discharge switch on the liquid discharge pipe, and pumping the liquid remaining in the liquid discharge pipe to the buffer unit by the low negative pressure generated by the low negative pressure regulating unit;

Step S60: closing the liquid discharge switch, the ventilation switch, and the low negative pressure regulating unit;

The execution order of step S31 and step S32 is interchangeable.

The invention also provides a liquid dispensing device, the device comprising:

At least one liquid storage module: the liquid storage module includes at least one liquid storage unit, at least one liquid outlet switch, and at least one ventilation switch; the liquid discharge switch is located on an outlet line of the liquid storage unit; a bypass line connected to the atmosphere and located between the liquid storage unit and the liquid discharge switch; wherein the liquid storage unit is provided with an opening valve and an air guiding port;

The pressure regulating module comprises at least one high negative pressure regulating unit and at least one low negative pressure regulating unit;

a cache module, comprising: a buffer unit, wherein the discharge port of the buffer unit is connected with a blanking switch; the buffer unit is disposed between the liquid storage module and the voltage regulating module, and a pipeline is connected to the liquid storage module, and is connected to the high negative pressure regulating unit and the low negative pressure regulating unit through the second pipeline;

And a control module: the control module is communicably connected to the liquid storage module, the voltage regulating module and the cache module, respectively.

Further, the vent switch is adjacent to an opening of the liquid storage unit, and/or the liquid discharge switch is adjacent to an interface of the liquid discharge line and the first line.

Further, the opening valve is a silicone valve, the opening pressure of the silicone valve is less than the absolute value of the high negative pressure generated by the high negative pressure regulating unit; and the silicone valve is used to adaptively open and close the buffer under the action of pressure The opening of the unit is simple and reliable.

Further, a gas balance switch is disposed on the second pipeline communicating with the buffer unit, and the gas balance switch is in communication with the atmosphere; before the low vacuum pressure regulating unit is opened, the gas balance switch is first opened to eliminate The gas balance switch is turned off after a high negative pressure in the cache unit.

Further, the second pipeline is further provided with a pressure detecting unit, the pressure detecting unit is disposed between the gas balance switch and the buffer unit; the pressure detecting unit is used for real-time monitoring of the pressure in the pipeline to improve the reliability of the entire device. Sex.

Further, the high negative pressure regulating unit includes at least one high negative pressure regulating valve, at least one high negative pressure switch and a vacuum pump, and the high negative pressure regulating valve is disposed on the vacuum pump and the high negative pressure switch And/or the low negative pressure regulating unit includes at least one low negative pressure regulating valve, at least one low negative pressure switch and a vacuum pump, the low negative pressure regulating valve being disposed at the vacuum pump and the low Between negative pressure switches.

Further, the high negative pressure regulating valve and the low negative pressure regulating valve are connected in parallel to the same vacuum pump; a first pump switch is arranged between the vacuum pump and the high negative pressure regulating valve, A second pump switch is disposed between the vacuum pump and the low negative pressure regulating valve.

Further, an air pump unit is disposed at an end of the second pipeline communicating with the buffer unit, and the air is blown into the pipeline and the buffer unit through the air pump in the air pump unit, so that the liquid can be blown out from the discharge port to improve the blanking. Control accuracy and accuracy.

Further, some or all of the switches in the liquid take-up device are solenoid valves.

Advantageous technical effects of the present invention:

The working method and the liquid measuring device of the liquid measuring device of the invention adopts the stepping negative pressure to suck the liquid, firstly extracting the liquid through the high negative pressure and then extracting the liquid remaining in the liquid discharging pipe through the low negative pressure, so that The whole process of taking the volume has the advantages of rapid liquid extraction, less residual liquid in the wall, and accurate sampling. In addition, the high negative pressure and low negative pressure extraction method also makes the liquid extraction. The process is fast and stable first, which effectively improves the life and reliability of the entire equipment.

DRAWINGS

1 is a schematic structural view of an embodiment of a liquid take-up device of the present invention;

2 is a schematic structural view of another embodiment of a voltage regulating module in a liquid measuring device according to the present invention.

Figure 3 is a schematic view showing the operation of the control module in the liquid take-up device of the present invention;

4 is a flow chart showing the operation of the liquid take-up device of the present invention.

detailed description

The detailed description of the embodiments of the present invention is set forth in the accompanying drawings and claims

The liquid take-up device of the present invention comprises a liquid storage module 1, a pressure regulating module 2, a cache module 3 and a control module 4,

As shown in FIG. 1, the liquid storage module 1 of the present invention may have a plurality of liquids for storing different kinds of liquids, such as cooking oil, soy sauce, vinegar and the like. Each liquid storage module 1 is mainly composed of liquid storage units C1-Cn, only C1 and C2 are illustrated in FIG. 1, and upper portions of respective liquid storage units (such as C1, C2) are provided with air guiding ports 12 capable of communicating with the atmosphere, so that The liquid in the liquid storage unit (such as C1, C2) can be sucked out under the action of negative pressure; the opening valve 11 is provided at the discharge port of the lower part of each liquid storage unit (such as C1, C2). In this embodiment, preferably, the opening valve 11 adopts a silicone valve, and the silicone valve automatically deforms or restores the original shape under the action of pressure, thereby adaptively opening and closing the liquid storage unit under pressure (such as C1 and C2). The lower discharge port. Of course, in other embodiments, the open valve 11 can also be a valve (such as a solenoid valve) that is automatically controlled by the control module 4 to open and close.

In addition, a discharge line is connected corresponding to the discharge port at the lower part of each liquid storage unit (such as C1, C2) and an outlet switch (such as F3, F5) is connected. Through the opening and closing of the liquid discharge switch (such as F3, F5), the type of liquid to be extracted can be selected, and the amount of liquid to be extracted can be controlled by opening and closing the time of the liquid discharge switch (such as F3, F5). In addition, a bypass line is connected to one side of the liquid discharge line communicating with the discharge port of the lower portion of each liquid storage unit (such as C1, C2), and the bypass line is located at the liquid storage unit and the liquid discharge switch. In the meantime, the bypass line is a branch line of the liquid discharge line, and the outlet line is not the same line. Specifically, the bypass line is provided with a ventilation switch (such as F1, F4), and the ventilation switch (such as F1, F4) is connected to the atmosphere, and the ventilation switch is opened (such as F1). F4) The inside of the liquid storage unit (such as C1, C2) can be connected to the atmosphere. At this time, the silicone valve closes the discharge port of the liquid storage unit (such as C1, C2) under the pressure balance, and the silicone valve has good The sealing effect, when closed, allows liquid storage units (such as C1, C2) to no longer drip down. In order not to affect the use of low vacuum to extract residual liquid from the liquid line, preferably the bypass line and the venting switch (eg F1, F4) are as close as possible to the lower part of the liquid storage unit (eg C1, C2) At the material inlet, after the liquid is pumped through the high pressure, the liquid discharge unit is closed and the opening valve of the liquid storage unit is closed, and the liquid remaining in the liquid supply unit of the liquid storage unit flows downward without flowing in. It is provided in the bypass line of the vent switch to ensure the accuracy of the intake.

The pressure regulating module 2 in the liquid take-up device of the present invention is used for classifying and outputting different negative pressures for sucking and quantifying liquid. Specifically, the pressure regulating module 2 includes at least one high negative pressure regulating unit 21 and at least one low negative pressure regulating unit 22. Wherein, the high negative pressure regulating unit 21 is used for quickly drawing the required amount of liquid from the liquid storage unit (such as C1, C2), and the low negative pressure regulating unit 22 is for performing the liquid remaining on the liquid discharging line. Slowly sucking, the extraction process is relatively stable, there is no liquid splashing, and the liquid is left in the liquid discharge pipe to affect the accuracy of the amount of liquid taken. Specifically, the high negative pressure regulating unit 21 includes a high negative pressure regulating valve TY1, a high negative pressure switch F6, and a vacuum pump D1. Specifically, the high negative pressure regulating valve TY1 is disposed on the vacuum pump D1 and the high negative pressure switch F6 shown. between. The low negative pressure regulating unit 22 includes a low negative pressure regulating valve TY2, a low negative pressure switch F8, and a vacuum pump D1. Specifically, the low negative pressure regulating valve TY2 is disposed between the vacuum pump D1 and the high negative pressure switch F6 shown. In the specific implementation, the vacuum relief valve can be selected for both the high negative pressure regulating valve TY1 and the low negative pressure regulating valve TY2. In addition, in the present embodiment, in order to ensure that the liquid in the liquid storage unit can be sucked out by the high negative pressure when the high-pressure pressure regulating unit 21 is operated, it is necessary to overcome the opening pressure of the above-mentioned silicone valve, in the present invention, when When the open valve 11 using the liquid storage unit is a silicone valve, the absolute value of the high negative pressure output by the high negative pressure regulating unit 21 should be greater than the opening pressure of the silicone valve.

The vacuum pump D1 included in the high negative pressure regulating unit 21 and the low negative pressure regulating unit 22 may be the same one, and the negative pressure is generated by the same air source device, and then passed through the high negative pressure regulating valve TY1 and the low negative pressure respectively. The pressure regulating valve TY2 performs negative pressure value adjustment, and then outputs preset high negative pressure value and low negative pressure value respectively, that is, the above high negative pressure value and low negative pressure value can pass the high negative pressure regulating valve TY1 according to actual needs. The low negative pressure regulating valve TY2 is set separately, for example, the value set by the high negative pressure regulating valve TY1 can be -10 KPa, and the value set by the low negative pressure regulating valve TY2 can be -2 KPa. Specifically, the high negative pressure regulating valve TY1 and the low negative pressure regulating valve TY2 are connected in parallel to the same vacuum pump D1, wherein A first pump switch F7 is disposed between the vacuum pump D1 and the high negative pressure regulating valve TY1, and a second pump switch F9 is disposed between the vacuum pump D1 and the low negative pressure regulating valve TY2. The first pump switch F7 and the second pump switch F9 are respectively used for controlling the opening and closing of the output high negative pressure and the output low negative pressure passage, that is, when the first pump switch F7 is opened and the second pump switch F9 is closed, the vacuum pump D1 is generated. The negative pressure leads to the high negative pressure regulating valve TY1; when the first pump switch F7 is closed and the second pump switch F9 is opened, the negative pressure generated by the vacuum pump D1 leads to the low negative pressure regulating valve TY2.

Of course, in other embodiments, as shown in FIG. 2, unlike the pressure regulating module 2 of FIG. 1, in this embodiment, the high negative pressure regulating valve TY1 and the low negative pressure regulating valve TY2 are each connected to one. When the vacuum pump D1 is used, it is not necessary to separately provide a pump switch between the vacuum pump D1 and the high negative pressure regulating valve TY1, between the vacuum pump D1 and the low negative pressure regulating valve TY2, and the high negative pressure regulating unit 21 and the low can also be realized. The negative pressure regulating unit 22 outputs a high negative pressure and a low negative pressure, respectively.

The cache module 3 of the present invention is used for buffering the liquid to be extracted. When the whole device absorbs and quantifies the liquid, the liquid in the cache module 3 is driven out by external force or from the cache module 3 by the weight of the liquid itself. The discharge port flows out. Specifically, the buffer module 3 includes a buffer unit, and the discharge port of the buffer unit is connected to the blanking main switch F2. The buffer unit is disposed between the liquid storage module 1 and the voltage regulating module 2, and passes through the first pipeline G1. It is in communication with each liquid storage module 1 and communicates with the high negative pressure regulating unit 21 and the low negative pressure regulating unit 22 through the second line G2; that is, the liquid outlet line below each liquid storage module 1 is connected as a branch line in parallel. Connected to the first line G1, the line for connecting each part of the high-naked pressure regulating unit 21 and the line for connecting each part of the low-pressure pressure regulating unit 22 are also used as branch pipes respectively. The road is connected in parallel to the second line G2.

With continued reference to FIG. 1, in the present embodiment, the blanking main switch F2 is disposed on the first line G1 and is adjacent to the end of the first line G1. In the present invention, each of the liquid storage modules 1 is in communication with the blanking main switch F2 through the first line G1. When the blanking main switch F2 is turned on, each of the sucked and quantified liquids can sequentially flow out from the buffer unit through the first line G1. Of course, in other embodiments, the blanking main switch F2 may also be disposed on the pipeline that is not in the same channel as the first pipeline G1, as long as the blanking main switch F2 is in communication with the discharge port of the buffer unit. In addition, preferably, the liquid discharge switch under each liquid storage unit is close to the interface between the liquid discharge line and the first line G1, so that liquid does not remain when flowing out of the buffer unit and through the first line G1. In the liquid outlet pipe, it is beneficial to improve the accuracy of the material feeding amount.

In the present invention, preferably, the second line G2 communicating with the buffer unit is provided with a gas balance switch F10, the gas balance switch F10 is in communication with the atmosphere; and the low negative pressure regulating unit 22 is opened for low Before the liquid is pumped under negative pressure, the gas balance switch F10 needs to be turned off immediately after opening. It should be noted that the gas balance switch F10 is turned on for a short time to eliminate the high negative pressure in the buffer unit, so that the liquid extraction process is more stable when a large volume of liquid is extracted. The term "short time" as used herein generally refers to a period of half a second to one second. In order not to affect the operation of the low-pressure pressure regulating unit 22, the opening and closing of the gas balance switch F10 is more accurately controlled. Preferably, the pressure detecting unit 5 may be disposed on the second line G2, wherein the pressure detecting unit 5 is located. The buffer unit and the air balance switch F10 are connected to each other and to the control module 4. The pressure detecting unit 5 can use a pressure gauge, which is mainly used for real-time monitoring of the pressure in the second pipeline G2 and the buffer unit. When the gas balance switch F10 is turned on to eliminate the high negative pressure, the pressure monitoring unit 5 detects the inside of the buffer unit. When the absolute value of the pressure and the low negative pressure are substantially equal, the control module controls the gas balance switch F10 to be closed, so that the buffer unit and the pipe connecting the buffer unit are no longer relieved. In addition, the gas balance switch F10 plays a key role in the smooth cutting of the entire equipment: when the step of extracting the liquid is completed, the gas balance switch F10 is connected to the atmosphere, and the gas balance switch F10 and the main switch are opened. F2, so that the liquid in the buffer unit can flow out from the discharge port of the buffer unit. In addition, in order to make the accuracy of the blanking more accurate, it is easy to prevent the viscous liquid from remaining on the inner wall of the buffer unit or the pipe when it is cut by the self-weight. In this embodiment, further, the end of the second pipe G2 communicating with the buffer unit is further The air pump unit is provided, that is, the air pump D2 is arranged in series at the end of the entire pipeline system opposite to the discharge port, and communicates with the entire pipeline system. After the air pump unit is opened, high-pressure gas can be blown into the buffer unit and the pipeline, and blown in. The high-pressure gas can blow the residual liquid in the pipeline from the discharge port after the pumping is completed, and eliminate the influence of the pipeline volume on the discharge accuracy of the entire system. In different embodiments, the air balance switch F10 can be separately disposed on the bypass line communicating with the second line G2; as shown in FIG. 1, in the embodiment, it can also be directly disposed under the air pump D2. Since the air pump D2 is not completely sealed, even if the air balance switch F10 is in communication with the atmosphere when it is disposed below the air pump D2, the above-mentioned pressure relief and blanking functions can be realized, and the air pump unit can be used to control the air pump unit blowing. On and off.

As shown in FIG. 3, the control module 4 of the present invention includes a CPU microprocessor, a relay driving unit, an I/O interface, a network interface unit, a start switch A1, and relays J1-J12. The network interface unit communicates with the external intelligent terminal in a wired or wireless manner. The liquid take-up device of the present invention acquires the discharge parameter from the external intelligent terminal through the network interface unit, and realizes automatic quantitative reclaiming of the liquid according to the discharge parameter. And blanking; receiving external input information through the I/O interface works in conjunction with other external intelligent terminals. In addition, each of the switches in the present invention may be a solenoid valve and is communicatively coupled to the control module 4, through the CPU microprocessor and relay drive in the control module 4. The moving unit controls the cooperative operation of each switch according to the discharging parameter; the vacuum pump D1 and the air pump D2 in the present invention are all connected with the control module 4, that is, the control module 4 controls the opening and closing of the vacuum pump D1 and the air pump D2, and cooperates with the switches. In order to complete the action of quantitative reclaiming and cutting.

As shown in FIG. 4, the present invention also discloses a working method of a liquid take-up device, the method comprising:

Step S32: Turn off the high vacuum pressure regulating unit;

Step S40: opening the low vacuum pressure regulating unit;

The execution order of step S31 and step S32 is interchangeable.

The working method of the present invention will be described in detail below in conjunction with one of the embodiments of the liquid take-up device. In order to better illustrate the present invention, the following is a detailed description of taking 1#-40 ml of edible oil as an example. It should be noted that the initial state of each switch (such as a solenoid valve) in the present invention is in a closed state, and the liquid take-up device starts to work by pressing the start switch A1:

Pre-pumping: The CPU microprocessor in the control module 4 drives the relays J10, J7 and J6 through the relay drive unit to make the vacuum pump D1 open, and the solenoid valves F7 and F6 are opened, and the vacuum generated by the vacuum pump D1 is high. After the negative pressure regulating valve TY1 becomes a preset high negative pressure value (such as -10KPa), the pipeline is pre-extracted by the high negative pressure value to eliminate the air in the pipeline to eliminate the air error in the pipeline. .

Receiving and parsing the reclaimed data: The CPU microprocessor receives the reclaimed data sent by the external intelligent terminal through the network interface unit, and parses the reclaimed data. Among them, the reclaimed data contains the required liquid material number and capacity parameters (such as 1# - edible oil 40 ml).

Reading the reclaimed data: The CPU microprocessor reads the reclaimed data of this step (such as 1#- edible oil 40 ml), and calculates the extraction time according to the capacity parameter of the liquid material in the reclaimed data (such as at high negative pressure) It takes 3 seconds to take 40 ml of edible oil at -10 KPa.

Open the corresponding solenoid valve according to the liquid material number: the CPU microprocessor selects the corresponding relay contact of the liquid storage unit (such as C1) through the relay drive unit according to the liquid material number (such as 1#) in the data in this step. (If the liquid discharge switch J3) is turned on, open the solenoid valve (such as F3) corresponding to the liquid storage unit (such as C1).

High negative pressure quantitative extraction of liquid material: the opening valve 11 of the liquid storage unit (such as C1) is opened under the action of high negative pressure, and the high negative pressure generated by the high negative pressure regulating unit 21 will be corresponding in the corresponding extraction time. The liquid material of the capacity is pumped to the buffer unit; after the quantitative extraction is completed, the contact of the relay (such as J3) is disconnected by the relay drive unit, thereby closing the corresponding solenoid valve (such as F3).

Eliminate the high negative pressure in the liquid outlet: Turn on the relay contact (such as J1) through the relay drive unit, and open the ventilation switch (such as F1) on the bypass line below the liquid storage unit (such as C1) to eliminate After the high negative pressure in the liquid discharge line, the opening valve 11 of the liquid storage unit (such as C1) is automatically closed.

The high negative pressure regulating unit is turned off: the CPU microprocessor in the control module 4 drives the relays J7 and J6 to open the contacts through the relay driving unit, and closes the electromagnetic valves F7 and F6.

Open the low negative pressure regulating unit: the CPU microprocessor in the control module 4 drives the relays J8 and J9 through the relay drive unit to open the solenoid valves F8 and F9, and the negative pressure generated by the vacuum pump D1 passes through the low negative After the pressure regulating valve TY2 is pressed, it becomes a preset low negative pressure value (such as -2KPa).

Low-pressure extraction of liquid remaining in the liquid discharge line: The CPU microprocessor in the control module 4 drives the J3 contact of the relay through the relay drive unit to turn on, and reopens the extracted liquid material corresponding to the solenoid valve (such as F3). The low negative pressure generated by the low negative pressure regulating unit draws the liquid remaining in the liquid discharge line to the buffer unit; since the liquid is slowed down due to the low negative pressure, the liquid can be prevented from splashing in the buffer unit, and also Prevent splashing liquid from entering the vacuum pump, effectively improving the life and reliability of the entire equipment.

End of quantitative extraction: The CPU microprocessor drives the J3, J1, J8, J9 and J10 contacts of the relay to be disconnected by the relay drive unit, and closes the solenoid valves F3, F1, F8 and F9, and the vacuum pump D1 stops working.

Before the low-pressure pressure regulating unit is turned on, in order to eliminate the high negative pressure in the buffer unit, the liquid-drawing process is more stable when the large-capacity liquid is extracted, and further, the micro-portion through the CPU is further included. The controller drives the J11 contact of the relay through the relay drive unit to turn on, opens the corresponding solenoid valve F11 for a short time, performs pressure relief, and closes the solenoid valve F11 within 0.5-1 seconds. Further, in order to make the action of closing the electromagnetic valve F11 more accurate, so that the pressure relief process does not affect the operation of the low vacuum pressure regulating unit, preferably, the detected information is transmitted to the control module 4 through the pressure detecting unit, thereby The control module 4 accurately controls the opening and closing operation of the solenoid valve F11. Specifically, when the pressure detecting unit detects that the pressure in the buffer unit is substantially equal to the absolute value of the negative pressure generated by the low-naked voltage regulating unit, the information is transmitted to the CPU microprocessor, and after receiving the information by the CPU microprocessor, The J11 contact of the relay driven by the relay drive unit is turned off, and the solenoid valve F11 is closed.

In the invention, in order to make the blanking effect better, the residual liquid which may appear in the pipeline or the buffer unit during the blanking process is avoided, and the precision of the blanking is affected, and after the quantitative liquid extraction is completed, the step of blowing and discharging is further included: CPU micro The processor turns on the contacts of the relays J2, J11 and J12 through the relay driving unit, opens the electromagnetic valve F2 and the electromagnetic valve F11, activates the air pump D2 to generate compressed air, and uses the compressed air to blow the liquid in the buffer unit through the discharge port. After the discharge is completed, the relays J2, J11 and J12 are disconnected, and the solenoid valve F2, the solenoid valve F11 and the air pump D2 are closed.

The working method and liquid measuring device of the liquid measuring device provided by the invention adopts the stepping negative pressure to suck the liquid, firstly extracts the liquid by high negative pressure and then extracts the residual liquid in the liquid discharging pipe through the low negative pressure. The liquid makes the whole taking process have the advantages of rapid liquid extraction, less residual residual liquid in the wall, and accurate taking; the liquid taking device adopts the method of first high negative pressure and low negative pressure to make the liquid in the process of extraction. Fast and smooth delivery first, effectively improving the life and reliability of the entire equipment.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

A working method of a liquid take-up device, characterized in that the method comprises:

Step S10: opening the high negative pressure regulating unit, pre-pumping the pipeline through the high negative pressure generated by the high negative pressure regulating unit, and eliminating the air in the pipeline;

Step S20: opening the liquid discharge switch on the liquid discharge pipe, the opening valve of the liquid storage unit is simultaneously opened; the liquid in the liquid storage unit is pumped to the buffer unit by the high negative pressure generated by the high negative pressure regulating unit; When the predetermined amount is extracted, the liquid discharge switch is turned off;

Step S31: The ventilation switch disposed on the bypass line between the liquid storage unit and the liquid discharge switch is opened, and the opening valve of the liquid storage unit is simultaneously closed; wherein the bypass line is in communication with the atmosphere, and the ventilation switch is opened. Eliminating high negative pressure in the liquid outlet between the liquid storage unit and the liquid outlet switch;

Step S32: Turn off the high vacuum pressure regulating unit;

Step S40: opening the low vacuum pressure regulating unit;

Step S50: opening the liquid discharge switch on the liquid discharge pipe, and pumping the liquid remaining in the liquid discharge pipe to the buffer unit by the low negative pressure generated by the low negative pressure regulating unit;

Step S60: closing the liquid discharge switch, the ventilation switch, and the low negative pressure regulating unit;

The execution order of step S31 and step S32 is interchangeable.
A liquid take-up device, characterized in that the device comprises:

At least one liquid storage module: the liquid storage module includes at least one liquid storage unit, at least one liquid outlet switch, and at least one ventilation switch; the liquid discharge switch is located on an outlet line of the liquid storage unit; a bypass line connected to the atmosphere and located between the liquid storage unit and the liquid discharge switch; wherein the liquid storage unit is provided with an opening valve and an air guiding port;

The pressure regulating module comprises at least one high negative pressure regulating unit and at least one low negative pressure regulating unit;

The cache module includes a buffer unit, and the discharge port of the buffer unit is connected with a blanking switch; the buffer unit is disposed between the liquid storage module and the voltage regulating module, and passes through the first pipeline and the The liquid storage module is connected to communicate with the high negative pressure regulating unit and the low negative pressure regulating unit through the second pipeline;

And a control module: the control module is communicably connected to the liquid storage module, the voltage regulating module and the cache module, respectively.
The apparatus according to claim 2, wherein said vent switch is adjacent to an opening of said liquid storage unit, and/or said discharge switch is adjacent to said liquid discharge line and said first The interface of the pipeline.
The apparatus according to claim 2, wherein said opening valve is a silicone valve, and said silicone valve has an opening pressure that is less than an absolute value of said high negative pressure generated by said high negative pressure regulating unit.
The apparatus according to claim 2, wherein the second pipeline communicating with the buffer unit is provided with a gas balance switch, the gas balance switch is in communication with the atmosphere; before the low vacuum pressure regulating unit is opened, the device is The gas balance switch is opened for a short time, and the gas balance switch is turned off after eliminating the high negative pressure in the buffer unit.
The apparatus according to claim 5, wherein the second pipeline is further provided with a pressure detecting unit, and the pressure detecting unit is disposed between the gas balance switch and the buffer unit.
The apparatus according to claim 2, wherein said high negative pressure regulating unit comprises at least one high negative pressure regulating valve, at least one high negative pressure switch and a vacuum pump, said high negative pressure regulating valve being disposed at Between the vacuum pump and the high negative pressure switch; and/or the low negative pressure regulating unit includes at least one low negative pressure regulating valve, at least one low negative pressure switch and a vacuum pump, the low negative pressure regulating pressure A valve is disposed between the vacuum pump and the low vacuum switch.
The apparatus according to claim 7, wherein said high negative pressure regulating valve and said low negative pressure regulating valve are connected in parallel to a same vacuum pump; said vacuum pump and said high negative pressure regulating pressure A first pump switch is disposed between the valves, and a second pump switch is disposed between the vacuum pump and the low negative pressure regulating valve.
The apparatus according to any one of claims 2 to 8, wherein an end of the second conduit communicating with the buffer unit is provided with an air pump unit.
Device according to any one of claims 2 to 8, characterized in that the switch in the liquid take-up device is partly or completely a solenoid valve.