CN115290389A - A liquid reagent segmented quantitative sampling device and its sampling method - Google Patents

Abstract

The invention relates to the technical field of liquid sampling equipment, and discloses a liquid reagent sectional quantitative sampling device which comprises a suction pump, a sampling bottle, a vent pipe, a liquid passing pipe, a pipeline switching device, a liquid level sensor and a controller. The invention also discloses a sampling method of the sampling device. The invention has simple structure, low cost and simple control, realizes accurate quantitative sampling by repeating accurate sampling for multiple times, and has high sampling precision.

Description

A liquid reagent subsection quantitative sampling device and sampling method thereof

technical field

The invention relates to the technical field of liquid sampling equipment, in particular to a segmented quantitative sampling device for liquid reagents and a sampling method thereof.

Background technique

With the development of mechanization, chemical analysis instruments are constantly updated. In the analysis and measurement of chemical inspection, the sampling accuracy of liquid reagents plays a decisive role in the accuracy of the entire result. If the accuracy is not up to standard, it will lead to data distortion and affect the analysis of data. , thereby reducing the overall performance of the entire chemical detector.

In order to solve the above problems, researchers have explored in various ways. Currently on the market, there are mainly two types of devices for quantitative sampling of liquid reagents:

1. Traditional peristaltic pump sampling, the peristaltic pump works by relying on the pumping efficiency produced by several rollers alternately squeezing or releasing along an elastic tube. The squeezed fluid in the tube produces flow output, and when the pressure disappears, the tube returns to its original shape by its own elasticity, the volume increases, a vacuum is generated, and the fluid is sucked in. Common peristaltic pumps on the market are driven by stepping motors, and the purpose of quantitative sampling is achieved by controlling the relationship between the speed and time of the peristaltic pump. The disadvantage of using peristaltic pump sampling is that the amount of reagent can only be determined through the relationship between time and the speed of the peristaltic pump, and the hose of the peristaltic pump will be deformed due to long-term extrusion, resulting in inaccurate quantification. It is used in water quality monitoring instruments. On the surface, the peristaltic pump tube needs to be replaced frequently, which not only increases the cost of consumables, but also the cost of human maintenance is particularly significant.

2. The syringe is used for sampling, which is composed of a stepper motor and its driver, screw rod and bracket. When working, the single-chip microcomputer system sends out control pulses to make the stepping motor rotate, and the stepping motor drives the screw to change the rotary motion into a linear motion, realizing high-precision, stable and pulse-free liquid transmission. The disadvantages of using syringes for sampling are: high cost, complex driving device, high requirements for maintenance personnel, and domestic syringes are not precise enough and easy to wear.

Contents of the invention

The technical problem to be solved by the present invention is to provide a segmented quantitative sampling device for liquid reagents with simple structure, low cost and high sampling accuracy.

In order to achieve the above object, the present invention provides a segmented quantitative sampling device for liquid reagents, including a suction pump, a sampling bottle, a vent pipe, a liquid pipe, a pipeline switching device, a liquid level sensor and a controller. The suction end of the pump is connected to the sampling bottle, and the sampling bottle, the vent pipe and the liquid pipe are respectively connected to the pipeline switching device, and the pipeline switching device is used to control the sampling bottle communicate with the ventilation pipe or control the communication between the sampling bottle and the liquid pipe, the liquid level sensor is arranged on the connecting pipe between the pipeline switching device and the sampling bottle, and the connecting pipe A first electromagnetic switch valve is provided, and the first electromagnetic switch valve is located between the sampling bottle and the liquid level sensor. The liquid level sensor, the first electromagnetic switch valve and the pipeline switching device are respectively Electrically connected with the controller.

As a preferred solution of the present invention, the connecting pipeline includes a quantitative section and a buffer section, one end of the quantitative section is connected to the pipeline switching device, and the other end of the quantitative section is connected to one end of the buffer section, so The other end of the buffer section is connected to the sampling bottle, and the liquid level sensor is located at the junction of the quantitative section and the buffer section.

As a preferred solution of the present invention, the liquid reagent subsection quantitative sampling device also includes a blowing device and a second electromagnetic switch valve electrically connected to the controller, and the connecting pipeline also includes a connecting section, and the quantitative section is far away from the One end of the buffer section is connected to one end of the connecting section through the second electromagnetic switch valve, the other end of the connecting section is connected to the pipeline switching device, and the connecting section is connected to the blowing device.

As a preferred solution of the present invention, the pipeline switching device is a multi-channel switching valve, the multi-channel switching valve is provided with an output port, an air inlet and a plurality of liquid inlets, and the connecting pipe is connected to the output port , the air inlet is connected to the ventilation pipe, and a plurality of the liquid inlets are respectively connected to the liquid pipes.

As a preferred solution of the present invention, a third electromagnetic switching valve is provided between the suction pump and the sampling bottle, and the third electromagnetic switching valve is electrically connected to the controller.

As a preferred solution of the present invention, the suction pump is a peristaltic pump or a plunger pump.

As a preferred solution of the present invention, the liquid level sensor is a non-contact liquid level sensor, and the connecting pipe is a hard pipe.

As a preferred solution of the present invention, it also includes a drive motor electrically connected to the controller, the drive motor is connected to the liquid level sensor through a transmission assembly, and the drive motor can drive the liquid level sensor along the connection The axis of the pipe moves.

The present invention also provides a sampling method of the liquid reagent subsection quantitative sampling device, comprising the following steps:

Step 1: Connect the vent pipe with the outside air, connect the liquid pipe with the liquid container to be sampled, the connecting pipe has a capacity of Xml from the liquid level sensor to the pipeline switching device, and take a sample The target capacity is Yml, Y=nX, wherein, n is an integer;

Step 2: the controller controls the pipeline switching device to switch to the state where the sampling bottle is connected to the liquid passage;

Step 3: the controller controls the opening of the first electromagnetic switch valve and the operation of the suction pump to pump the liquid in the liquid container to the connecting pipeline;

Step 4: When the liquid level sensor detects liquid, the liquid level sensor feeds back a signal to the controller, and the controller controls the first electromagnetic switch valve to close and the suction pump to stop working;

Step 5: the controller controls the pipeline switching device to switch to the state where the sampling bottle is connected to the ventilation pipeline;

Step 6: The controller controls the opening of the first electromagnetic switch valve and the operation of the suction pump to pump the outside air into the connecting pipe, and pump the liquid in the connecting pipe to the connected pipe at the same time. in the sampling bottle;

Step 7: When all the liquid in the connecting pipeline enters the sampling bottle, the controller controls the first electromagnetic switch valve to close and controls the suction pump to stop working;

Step 8: Repeat steps 2 to 7 until the volume of the liquid in the sampling bottle reaches the target value for sampling.

As a preferred solution of the present invention, when sequentially quantitatively sampling multiple liquids, X can evenly divide the sampling target volumes of multiple liquids.

Compared with the prior art, a segmented quantitative sampling device for liquid reagent and its sampling method in the embodiment of the present invention have the beneficial effect that the liquid is first pumped into the connecting pipeline through the suction pump, and then the liquid is detected by the liquid level sensor to Determine the amount of liquid in the connecting pipe, and then pump air through the suction pump to pump the liquid in the connecting pipe to the sampling bottle, so as to accurately achieve a single sampling, and finally achieve the target value accurately by repeating multiple sampling; The invention has the advantages of simple structure, low cost and simple control, realizes accurate quantitative sampling by repeating accurate sampling for many times, and has high sampling precision.

Description of drawings

Fig. 1 is a schematic structural view of Embodiment 1 of the present invention;

Fig. 2 is a schematic structural diagram of Embodiment 2 of the present invention;

3 is a schematic diagram of the connection structure between the drive motor and the liquid level sensor in Embodiment 2 of the present invention;

In the figure, 1. Suction pump; 2. Sampling bottle; 21. First electromagnetic switch valve; 22. Third electromagnetic switch valve; 3. Ventilation pipe; 4. Liquid pipe; 5. Pipeline switching device; 51. Output port; 52, air inlet; 53, liquid inlet; 6, liquid level sensor; 7, connecting pipe; 71, quantitative section; 72, buffer section; 73, connecting section; 731, second electromagnetic switch valve; 8 , blowing device; 9, drive motor; 91, transmission components.

Detailed ways

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

In describing the present invention, it should be understood that the present invention uses the terms "central", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right" ", "vertical", "horizontal", "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing this The invention and the simplified description do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

As shown in FIG. 1 , Embodiment 1 of the present invention.

A segmented quantitative sampling device for liquid reagents, comprising a suction pump 1, a sampling bottle 2, a vent pipe 3, a liquid pipe 4, a pipeline switching device 5, a liquid level sensor 6 and a controller, and the suction of the suction pump 1 connected to the sampling bottle 2, the sampling bottle 2, the vent pipe 3 and the liquid pipe 4 are respectively connected to the pipeline switching device 5, and the pipeline switching device 5 is used to control the communication between the sampling bottle 2 and the vent pipe 3 or to control the connection between the sampling bottle 2 and the ventilation pipe 3. The liquid pipe 4 is connected, and the liquid level sensor 6 is arranged on the connecting pipe 7 between the pipeline switching device 5 and the sampling bottle 2. The connecting pipe 7 is provided with a first electromagnetic switch valve 21, and the first electromagnetic switch valve 21 is located at the sampling point. Between the bottle 2 and the liquid level sensor 6, the liquid level sensor 6, the first electromagnetic switching valve 21 and the pipeline switching device 5 are respectively electrically connected to the controller.

The sampling method of the present embodiment comprises the following steps:

Step 1: Connect the 3 ventilation pipes with the outside air, connect the 4 liquid pipes with the liquid container to be sampled, connect the pipeline 7 from the liquid level sensor 6 to the pipeline switching device 5 with a capacity of Xml, and the sampling target volume is Yml, Y=nX, wherein, n is an integer;

Step 2: The controller controls the pipeline switching device 5 to switch to the state where the sampling bottle 2 is connected to the liquid pipe 4;

Step 3: the controller controls the opening of the first electromagnetic switch valve 21 and controls the operation of the suction pump 1 to pump the liquid in the liquid container to the connecting pipe 7;

Step 4: When the liquid level sensor 6 detects liquid, the liquid level sensor 6 feeds back a signal to the controller, and the controller controls the first electromagnetic switch valve 21 to close and controls the suction pump 1 to stop working. The part from the sensor 6 to the pipeline switching device 5 is filled with liquid, that is, the liquid intake in the connecting pipeline 7 is Xml;

Step 5: The controller controls the pipeline switching device 5 to switch to the state where the sampling bottle 2 is connected to the ventilation pipe 3. After the first electromagnetic switch valve 21 is closed, the sampling bottle 2 is not connected to the connecting pipe 7, so that the connecting pipe 7 is not connected to the pipe. During the switching state of the channel switching device 5, the liquid is continuously fed, and at the same time, the liquid in the sampling bottle 2 can be prevented from flowing back into the connecting pipe 7, thereby ensuring the accuracy of sampling;

Step 6: The controller controls the opening of the first electromagnetic switch valve 21 and controls the operation of the suction pump 1 to pump the outside air into the connecting pipe 7, and at the same time pump the liquid in the connecting pipe 7 into the sampling bottle 2, that is, the subsequent What enters the connecting pipe 7 is air instead of the liquid to be sampled, so the amount of liquid entering the connecting pipe 7 will not be increased;

Step 7: After all the liquid in the connecting pipeline 7 enters the sampling bottle 2, the controller controls the first electromagnetic switch valve 21 to close and controls the suction pump 1 to stop working, that is, the single sampling volume of the sampling bottle 2 is Xml, generally , when the liquid sensor does not detect liquid, it can indicate that a single sampling is completed, but in order to ensure that the liquid in the connecting pipe 7 enters the sampling bottle 2, a certain suction time can be extended, which can be obtained according to the test;

Step 8: Repeat steps 2 to 7 until the capacity of the liquid in the sampling bottle 2 reaches the target value for sampling. Since each sampling volume is Xml, after n times of sampling, the liquid in the sampling bottle 2 can be The target sampling value is Yml, and the sampling accuracy is high. Generally, the single sampling value can be 1ml, which makes the applicability of the sampling device high. Of course, the single sampling value can also take other values according to the actual use.

Exemplarily, when sequentially quantitatively sampling multiple liquids, X can divide the sampling target volumes of multiple liquids, such as the sampling target volume of the first liquid is 1ml, the sampling target volume of the second liquid is 1.5ml, and the third liquid When the sampling target volume is 2ml, the single sampling value can be selected as 0.5ml. When the required doses of multiple liquids cannot be divisible by X, the concentration of each liquid can be adjusted under the premise of ensuring that the required dose remains unchanged. The final sampling target capacity of can be divisible by X.

In this embodiment, the liquid is first pumped into the connecting pipe 7 through the suction pump 1, and then the liquid is detected by the liquid level sensor 6 to determine the amount of liquid entering the connecting pipe 7, and then the air is pumped through the suction pump 1 to drain the liquid into the connecting pipe 7. The liquid is pumped to the sampling bottle 2, thereby accurately realizing a single sampling, and finally by repeating multiple samplings to accurately achieve the sampling of the target value; the present invention is simple in structure, low in cost, and simple in control. Accurate quantitative sampling, high sampling accuracy.

Exemplarily, the connection pipeline 7 includes a quantitative section 71 and a buffer section 72, one end of the quantitative section 71 is connected to the pipeline switching device 5, the other end of the quantitative section 71 is connected to one end of the buffer section 72, and the other end of the buffer section 72 is connected to The sampling bottle 2 is connected, and the liquid level sensor 6 is located at the junction of the quantitative section 71 and the buffer section 72. The capacity of the quantitative section 71 is the single sampling amount, and the buffer section 72 is set so that there is a gap between the liquid level sensor 6 and the sampling bottle 2. A certain space for liquid delivery prevents the liquid level sensor 6 from being directly connected to the sampling bottle 2, thereby ensuring the normal operation of the liquid level sensor 6.

Exemplarily, the pipeline switching device 5 is a three-way solenoid valve, the three-way solenoid valve is provided with an output port 51, an air inlet 52 and a liquid inlet 53, the connecting pipe 7 is connected to the output port 51, and the air inlet 52 is connected to the through The air pipes are connected by 3 channels, the liquid inlet 53 is connected with the liquid pipe 4, and the three-way solenoid valve can control the connection between the air inlet 52 and the output port 51 or control the connection between the liquid inlet 53 and the output port 51, and the pipeline is switched to use three Through the electromagnetic valve, the overall structure of the whole sampling device is relatively simple and the volume is small. In addition, the pipeline switching device 5 can use two electromagnetic valves, one electromagnetic valve is connected with the connecting pipeline 7 and the ventilation pipe 3 respectively, and the other electromagnetic valve They are respectively connected to the connecting pipe 7 and the liquid pipe 4, which can also realize the function of pipe switching.

Exemplarily, a third electromagnetic switch valve 22 is provided between the suction pump 1 and the sampling bottle 2, specifically, the third electromagnetic switch valve 22 is provided on the pipeline between the suction pump 1 and the sampling bottle 2 for controlling The suction pump 1 is connected or cut off from the sampling bottle 2, and the third electromagnetic switch valve 22 is electrically connected to the controller. In some experimental scenarios, it is necessary to quantitatively sample various liquids respectively to the sampling bottle 2, and then wait in a closed environment. Its reaction, now the third electromagnetic switch valve 22 and the first electromagnetic switch valve 21 are closed to make the sampling bottle 2 in a closed state.

Exemplarily, the suction pump 1 is a peristaltic pump, which has the characteristics of high stability and high precision, and can well control the speed at which the liquid enters the connecting pipe 7, so as to avoid the liquid level sensor 6 failing to detect and react too quickly, thereby The precision of a single sampling volume is affected due to excessive liquid intake. In addition, the suction pump 1 can also be a plunger pump and other pumps capable of pumping liquid and air.

As shown in Figure 2, the second embodiment of the present invention.

This embodiment is different from Embodiment 1 in that the liquid reagent subsection quantitative sampling device also includes a blowing device 8 and a second electromagnetic switch valve 731 electrically connected to the controller, and the connecting pipeline 7 also includes a connecting section 73, a quantitative section 71 One end away from the buffer section 72 is connected to one end of the connecting section 73 through the second electromagnetic switching valve 731, the other end of the connecting section 73 is connected to the pipeline switching device 5, and the connecting section 73 is connected to the blowing device 8, that is, the quantitative section 71 is connected to the pipe There is a certain space for liquid delivery between the circuit switching devices 5, and the setting of the second electromagnetic switch valve 731 is to ensure that the capacity of the quantitative section 71 is the single sampling volume of the device, specifically when the liquid level sensor 6 detects liquid At this time, the controller controls the second electromagnetic switch valve 731 to close, at this time, the liquid fills the quantitative section 71, and then the controller controls the blowing device 8 to work, and the liquid in the connecting section 73 is reversely transported (that is, it flows to the quantitative section 71) The direction is opposite), so as to empty the liquid in the connecting section 73 and the pipeline switching device 5, and then the controller controls the pipeline switching device 5 to switch to the state where the connecting pipeline 7 communicates with the ventilation pipe 3, that is, to prevent the suction pump 1 from pumping When there is air, there is liquid remaining in the connecting section 73 and the pipeline switching device 5, which will affect the accuracy of a single sampling. It should be noted that the blowing device 8 is a device that can control the start and stop. Gas, blowing device 8 is not connected with connecting section 73 when not working, as blowing device 8 comprises blowing pipe, high-pressure air source and blowing electromagnetic valve, one end of blowing pipe is connected with connecting section 73, and the other end of blowing pipe is connected with high-pressure gas. source connection, the blowing solenoid valve is arranged on the blowing pipe and the blowing solenoid valve is electrically connected to the controller, and the blowing solenoid valve is used to control whether the blowing pipe purges the connection section 73 .

Exemplarily, the pipeline switching device 5 is a multi-channel switching valve, such as a multi-channel solenoid valve. The multi-channel switching valve is provided with an output port 51, an air inlet 52 and a plurality of liquid inlets 53, and the connecting pipe 7 and the output port 51 connection, the air inlet 52 is connected with the ventilation pipe 3, and each liquid inlet 53 is connected with a liquid pipe 4, that is, the number of the liquid pipe 4 is the same as that of the liquid inlet 53, and the liquid inlet 53 is connected with the liquid pipe. 4 are connected in one-to-one correspondence, so as to carry out quantitative sampling of various liquids in turn.

Exemplarily, the liquid level sensor 6 is a non-contact liquid level sensor 6, which is easy to install, has fast detection response and high precision, and the connecting pipe 7 is a hard tube, such as a quartz tube, to avoid pressure deformation during the sampling process and affect sampling Accuracy, the liquid level sensor 6 can move along the axial direction of the connecting pipe 7, thereby adjusting a single sampling volume, such as installing a sleeve on the connecting pipe 7, the mounting sleeve can slide on the connecting pipe 7 Sliding on the quantitative section 71), the main liquid level sensor 6 is installed on the installation sleeve, and the connecting pipe 7 is provided with a scale line for marking the capacity (mainly for marking the capacity of the quantitative section 71), by adjusting the position of the installation sleeve to Change the detection position of the liquid level sensor 6, thereby adjusting the single sampling volume of the sampling device. When quantitatively sampling multiple liquids in sequence, when it is not convenient to select a number that can divide the sampling target capacity of multiple liquids, you can adjust the single sampling volume. Quantitative sampling of various liquids in sequence, such as the sampling target volume of the first liquid is 0.8ml, the sampling target volume of the second liquid is 1ml, and the sampling target volume of the third liquid is 1.5ml, then the first liquid is sampled When sampling, the single sampling volume can be adjusted to 0.4ml. When sampling the second liquid and the third liquid, the single sampling volume can be adjusted to 0.5ml.

In this embodiment, as shown in Figure 3, the liquid reagent subsection quantitative sampling device also includes a drive motor 9 electrically connected to the controller, and the drive motor 9 is connected to the liquid level sensor through a transmission assembly. In this embodiment, the transmission assembly 91 is a screw nut pair. In addition, the transmission component 91 can also be other components that can convert the rotation of the motor into linear motion. The drive motor 9 can drive the liquid level sensor to move along the axis of the connecting pipeline 7 (that is, along the axis of the connecting pipeline 7). The axis of the quantitative section 71 moves), thereby adjusting the relative position of the liquid level sensor 6 and the connecting pipe 7, so as to change the detection position of the liquid level sensor 6, thereby adjusting the single sampling amount of the sampling device, which is driven and adjusted by the drive motor 9, Convenience and high precision, in the present embodiment, the connecting pipe 7 is provided with a mounting block, and the driving motor 9 is arranged on the mounting block, so that the setting of the driving motor 9 and the transmission assembly 91 is convenient, the driving motor 9, the transmission assembly 91, the liquid level sensor 6 and connecting pipe 7 are integrated into one body, which is convenient to move.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the present invention, some improvements and replacements can also be made, these improvements and replacements It should also be regarded as the protection scope of the present invention.

Claims (10)

1. A segmented quantitative sampling device for liquid reagents, characterized in that: comprising a suction pump, a sampling bottle, a vent pipe, a liquid pipe, a pipeline switching device, a liquid level sensor and a controller, the suction pump of the suction pump The suction end is connected to the sampling bottle, and the sampling bottle, the vent pipe and the liquid pipe are respectively connected to the pipeline switching device, and the pipeline switching device is used to control the connection between the sampling bottle and the The vent pipe is connected or the sampling bottle is connected with the liquid pipe, the liquid level sensor is arranged on the connecting pipe between the pipeline switching device and the sampling bottle, and the connecting pipe is provided with a second An electromagnetic switch valve, the first electromagnetic switch valve is located between the sampling bottle and the liquid level sensor, the liquid level sensor, the first electromagnetic switch valve and the pipeline switching device are respectively connected to the The controller is electrically connected. 2. The segmental quantitative sampling device for liquid reagents according to claim 1, characterized in that: the connecting pipeline includes a quantitative segment and a buffer segment, one end of the quantitative segment is connected to the pipeline switching device, and the quantitative The other end of the segment is connected to one end of the buffer segment, the other end of the buffer segment is connected to the sampling bottle, and the liquid level sensor is located at the connection between the quantitative segment and the buffer segment. 3. The segmental quantitative sampling device for liquid reagent according to claim 2, characterized in that: it also includes a blowing device and a second electromagnetic switch valve electrically connected to the controller respectively, and the connecting pipeline also includes a connecting section, The end of the quantitative section away from the buffer section is connected to one end of the connecting section through the second electromagnetic switch valve, the other end of the connecting section is connected to the pipeline switching device, and the connecting section is connected to the connecting section. The blowing device is connected. 4. The segmental quantitative sampling device for liquid reagents according to claim 1, characterized in that: the pipeline switching device is a multi-channel switching valve, and the multi-channel switching valve is provided with an output port, an air inlet and a plurality of A liquid inlet, the connecting pipe is connected to the output port, the air inlet is connected to the ventilation pipe, and a plurality of the liquid inlets are respectively connected to the liquid pipe. 5. The segmental quantitative sampling device for liquid reagents according to claim 1, characterized in that: a third electromagnetic switching valve is arranged between the suction pump and the sampling bottle, and the third electromagnetic switching valve is connected to the sampling bottle. The controller is electrically connected. 6. The segmented quantitative sampling device for liquid reagents according to claim 1, characterized in that: the suction pump is a peristaltic pump or a plunger pump. 7. The segmental quantitative sampling device for liquid reagents according to claim 1, wherein the liquid level sensor is a non-contact liquid level sensor, and the connecting pipe is a hard pipe. 8. The segmental quantitative sampling device for liquid reagents according to claim 7, characterized in that: it also includes a drive motor electrically connected to the controller, the drive motor is connected to the liquid level sensor through a transmission assembly, the The driving motor can drive the liquid level sensor to move along the axial direction of the connecting pipe. 9. A sampling method of a liquid reagent subsection quantitative sampling device as claimed in claim 1, characterized in that: comprising the following steps: Step 1: Connect the vent pipe with the outside air, connect the liquid pipe with the liquid container to be sampled, the connecting pipe has a capacity of Xml from the liquid level sensor to the pipeline switching device, and take a sample The target capacity is Yml, Y=nX, wherein, n is an integer; Step 2: the controller controls the pipeline switching device to switch to the state where the sampling bottle is connected to the liquid passage; Step 3: the controller controls the opening of the first electromagnetic switch valve and the operation of the suction pump to pump the liquid in the liquid container to the connecting pipeline; Step 4: When the liquid level sensor detects liquid, the liquid level sensor feeds back a signal to the controller, and the controller controls the first electromagnetic switch valve to close and the suction pump to stop working; Step 5: the controller controls the pipeline switching device to switch to the state where the sampling bottle is connected to the ventilation pipeline; Step 6: The controller controls the opening of the first electromagnetic switch valve and the operation of the suction pump to pump the outside air into the connecting pipe, and pump the liquid in the connecting pipe to the connected pipe at the same time. in the sampling bottle; Step 7: When all the liquid in the connecting pipeline enters the sampling bottle, the controller controls the first electromagnetic switch valve to close and controls the suction pump to stop working; Step 8: Repeat steps 2 to 7 until the volume of the liquid in the sampling bottle reaches the target value for sampling. 10. The sampling method of the segmental quantitative sampling device for liquid reagents according to claim 9, characterized in that: when sequentially quantitatively sampling multiple liquids, X can divide the sampling target volumes of multiple liquids.

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