Automatic sampling device

Abstract

The utility model belongs to the technical field of detection equipment, and discloses an automatic sample introduction device, which comprises a sample plate, a sample liquid mixer, a liquid transfer component, a sample introduction pump and a controller, and under the control of the controller, the sample plate can transfer a sample container containing samples to a sampling area; the two groups of pipetting assemblies are used for respectively sucking quantitative samples and reagents into the sample liquid mixer, and the samples and the reagents can be fed to the detection device through the sample feeding pump after being uniformly mixed in the sample liquid mixer, so that deviation and errors caused by manual operation are reduced, and the detection efficiency and the detection precision are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, in particular to an automatic sampling device. Background Art

[0002] Calcium is closely related to physical health. In addition to forming bones to support the body, calcium also participates in the metabolic activities of the human body, and drinking milk is one of the most common ways to supplement calcium. Therefore, the calcium content has become one of the criteria for evaluating the quality of dairy products.

[0003] Currently, the detection of calcium content in dairy products mainly uses an atomic flame absorption spectrophotometer to detect the ashed samples. The detection process requires manual sampling and reagent addition. The detection results are easily affected by human errors and contamination during the processing. Moreover, when a large number of samples need to be detected, the detection efficiency is easily reduced due to the low sampling efficiency. Content of the Utility Model

[0004] The purpose of the utility model is to provide an automatic sampling device to solve the problems of low manual sampling efficiency and large detection errors caused by manual sampling during the detection of calcium content.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The automatic sampling device includes a base, a sample tray, a sample liquid mixer, a pipetting assembly, and an injection pump. The base has a sampling area, a reagent placement area, and a sample liquid mixing area. The sample tray includes a first rotation driving member and a sample tray body. A plurality of limiting grooves for placing sample containers filled with samples are circumferentially spaced on the sample tray body. The sample tray body is rotatably arranged on the base through a rotating shaft, so that any one of the sample containers on the sample tray body rotates to the sampling area. The first rotation driving member is configured to provide the power for the rotation of the sample tray body. The sample liquid mixer is arranged in the sample liquid mixing area and is configured to mix the sample and the reagent. At least two groups of pipetting assemblies are provided. One group of pipetting assemblies is configured to quantitatively aspirate the sample in the sample container located in the sampling area and transfer it to the sample liquid mixer, and the other group of pipetting assemblies is configured to quantitatively aspirate the reagent in the reagent container located in the reagent placement area and transfer it to the sample liquid mixer. The injection pump is connected to the sample liquid mixer. The controller is communicatively connected to the sample tray, the pipetting assembly, the sample liquid mixer, and the pump.

[0007] In one embodiment, the sample tray further includes a fixed gripper. The fixed gripper is fixed to the rotating shaft through a connecting rod. A plurality of fixed grippers are correspondingly arranged above the limiting grooves, and the fixed grippers are configured to fix the sample containers in the limiting grooves.

[0008] In one embodiment, the automatic sampler further includes an open - lid gripper, which is disposed above the sampling area and is configured to open the sample container.

[0009] In one embodiment, the open - lid gripper includes a first lifting drive, a second rotation drive, and a jaw cylinder. The second rotation drive is disposed at the output end of the first lifting drive, and the jaw cylinder is disposed at the output end of the second rotation drive.

[0010] In one embodiment, the sample tray body is connected to the rotating shaft by a sliding key. The sample tray further includes a cam and a vibration drive. The cam abuts against the lower surface of the sample tray body, and the vibration drive is configured to drive the cam to rotate and is communicatively connected to the controller.

[0011] In one embodiment, the liquid transfer assembly includes a pipettor, a liquid transfer needle, a second lifting drive, and a third rotation drive. The liquid transfer needle is L - shaped, and the horizontal end is connected to the pipettor. The third rotation drive is configured to drive the liquid transfer needle to perform a circular motion with the pipettor as the axis. The second lifting drive is configured to drive the liquid transfer needle and the pipettor to move up and down. The sampling area is disposed on the movement path of the end of the liquid transfer needle of one set of the liquid transfer assemblies away from the pipettor. The reagent placement area is disposed on the movement path of the end of the liquid transfer needle of the other set of the liquid transfer assemblies away from the pipettor. The sample liquid mixing area is disposed on the movement paths of the ends of the liquid transfer needles of both sets of the liquid transfer assemblies away from the pipettor.

[0012] In one embodiment, a cleaning area is further provided on the base. The cleaning area is used to place a cleaning container filled with cleaning liquid, and the cleaning area is at least on the movement path of the end of the liquid transfer needle of the liquid transfer assembly for transferring the sample away from the pipettor.

[0013] In one embodiment, a waste liquid area is further provided on the base. The waste liquid area is used to place a waste liquid container for holding waste liquid, and the waste liquid area is on the movement path of the end of the liquid transfer needle of the liquid transfer assembly for transferring the sample away from the pipettor.

[0014] In one embodiment, a positioning assembly is provided in the reagent placement area. The positioning assembly includes a positioning groove seat, an elastic member, and a clamping block. The positioning groove seat is fixedly provided on the base and is provided with a positioning groove with an upward - opening slot. An avoidance groove is provided in the positioning groove. The clamping block is connected to the positioning groove seat through an elastic member disposed in the avoidance groove, and the elastic member provides an elastic force to the clamping block to keep the clamping block in a tendency to protrude out of the avoidance groove.

[0015] In one embodiment, the automatic sampling device further includes a protective box body, and the base, the sample tray, the liquid transfer assembly, and the pump are all located inside the protective box body.

[0016] Advantages of the present utility model:

[0017] In the automatic sampling device according to the embodiment of the present utility model, the sample tray body is used to sequentially transfer a plurality of sample containers filled with samples to the sampling area, and then two sets of liquid transfer assemblies are used to respectively aspirate a quantitative amount of sample and reagent into the sample liquid mixer. After the sample and the reagent are mixed in the sample liquid mixer, they can be injected into the detection device through the injection pump, reducing the deviation and error caused by manual operation, and improving the detection efficiency and detection accuracy. Description of the drawings

[0018] Figure 1 is the front view of the automatic sampling device according to the embodiment of the present utility model;

[0019] Figure 2 is the top view of the automatic sampling device according to the embodiment of the present utility model;

[0020] Figure 3 is the structural schematic diagram of the pipette according to the embodiment of the present utility model;

[0021] Figure 4 is the structural schematic diagram of the sample liquid mixer according to the embodiment of the present utility model;

[0022] Figure 5 is the structural schematic diagram of the positioning assembly according to the embodiment of the present utility model.

[0023] In the figure:

[0024] 1. Base; 2. Sample tray; 21. Sample tray body; 22. First rotation driving member; 23. Fixed gripper; 24. Open - cover gripper; 25. First connecting rod; 26. Second connecting rod; 3. Liquid transfer assembly; 31. Pipette; 311. Sleeve; 312. Piston; 313. Piston rod; 314. Third lifting driving member; 315. Third connecting rod; 32. Liquid transfer needle; 4. Sample liquid mixer; 41. Mixing container; 42. Stirring blade; 43. Stirring driving member; 5. Positioning assembly; 51. Positioning groove seat; 52. Block; 6. Protective box body; 7. Vibration - damping support feet. Detailed implementation manners

[0025] The following further describes the present utility model in detail with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. Additionally, it should be noted that for the sake of description, only parts related to the present utility model rather than all structures are shown in the drawings.

[0026] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0027] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0028] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0029] Reference Figures 1 - 5As shown in the figure, in an embodiment of the present utility model, an automatic sampling device is proposed, which includes a base 1, a sample tray 2, a liquid transfer assembly 3, a sample liquid mixer 4, a sampling pump, and a controller. Among them, the base 1 has a sampling area, a reagent placement area, and a sample liquid mixing area. The sample tray 2 includes a first rotation driving member 22 and a sample tray body 21. A plurality of limiting grooves are circumferentially and spacedly arranged on the sample tray body 21. The limiting grooves are used to place sample containers filled with liquid samples. The sample tray body 21 is rotatably arranged on the base 1 through a rotating shaft, so as to rotate any sample container on the sample tray body 21 to the sampling area. The first rotation driving member 22 is connected to the rotating shaft, and the first rotation driving member 22 is configured to provide rotational power to the sample tray body 21. At least two groups of liquid transfer assemblies 3 are provided. One group of liquid transfer assemblies 3 is configured to quantitatively suck the sample in the sample container located in the sampling area and transfer it to the sample liquid mixer 4 located in the sample liquid mixing area. Another group of liquid transfer assemblies 3 is configured to quantitatively suck the reagent in the reagent container located in the reagent placement area and transfer it to the sample liquid mixer 4. The sample liquid mixer 4 is configured to mix the sample and the reagent. The sampling pump is connected to the sample liquid mixer 4 to pump the mixed liquid to the detection device. The sampling pump can specifically adopt a peristaltic pump. The controller is communicatively connected to the sample tray 2, the liquid transfer assembly 3, the sample liquid mixer 4, and the sampling pump, and is used to coordinately control the above functional mechanisms (referring to the sample tray 2, the liquid transfer assembly 3, the sample liquid mixer 4, and the sampling pump) to complete the sampling process of the same sample and the cyclic continuous sampling of multiple samples.

[0030] The controller can adopt existing functional devices such as a computer, a single-chip microcomputer, a PLC, etc. according to the actual situation, or an existing distributed or centralized control system as the controller. The functions of the controller include but are not limited to the start-stop control of each functional mechanism, the reception and feedback of signals, etc. The control methods and control principles of the controller for the above functional mechanisms all belong to the prior art and will not be elaborated here.

[0031] In the above automatic sampling device, the sample tray 2 of the automatic sampling device sequentially transfers a plurality of sample containers filled with samples to the sampling area, and then uses two groups of liquid transfer assemblies 3 to respectively suck a quantitative sample and reagent into the sample liquid mixer 4. After the sample and the reagent are mixed in the sample liquid mixer 4, they can be sampled by the sampling pump to the detection device, reducing the deviation and error caused by manual operation and improving the detection efficiency and detection accuracy.

[0032] Reference Figure 1 and Figure 2As shown, in order to improve the stability of the sample container on the sample tray body 21, the sample tray 2 further includes a fixed gripper 23. The fixed gripper 23 is fixed on the rotating shaft through a first connecting rod 25 extending radially along the rotating shaft to rotate together with the rotating shaft, and a plurality of fixed grippers 23 are correspondingly arranged above the limiting slots to fix the sample containers placed in the limiting slots. The fixed gripper 23 can adopt any mechanical gripper structure in the prior art, such as a gripper cylinder, and no specific limitation is made here.

[0033] In order to prevent the samples in the sample containers from leaking out when rotating with the sample tray body 21, plug caps are threadedly connected to the container openings of the sample containers. On this basis, the automatic sampling device further includes an open cap gripper 24. The open cap gripper 24 is arranged above the sampling area to facilitate removing the plug cap from the sample container, thereby opening the sample container. In one embodiment, the first rotation driving member 22 is fixed above the sample tray body 21 through a stand, and its output end is connected to the top end of the rotating shaft. The open cap gripper 24 is connected to the fixed end of the first rotation driving member 22 or to the stand through a second connecting rod 26 extending radially along the rotating shaft.

[0034] Specifically, referring to Figure 1 As shown, the open cap gripper 24 includes a first lifting driving member, a second rotation driving member and a gripper cylinder. The second rotation driving member is arranged at the output end of the first lifting driving member, and the gripper cylinder is arranged at the output end of the second rotation driving member. The gripper cylinder can clamp the plug cap and rotate under the action of the second rotation driving member, so as to remove the plug cap from the sample container. Obviously, the open cap gripper 24 needs to be used in cooperation with the fixed gripper 23 to prevent the sample container from rotating together with the plug cap.

[0035] The first lifting driving member can specifically adopt a lifting cylinder, and both the second rotation driving member and the first rotation driving member 22 can adopt a rotating motor. The difference is that the rotating motor used for the first rotation driving member 22 is a grating motor, so that any sample container on the sample tray body 21 can accurately stop at the sampling area.

[0036] Optionally, the open cap gripper 24 further includes a rubber pad. The rubber pad is arranged on the relative inner sides of the two grippers of the gripper cylinder to increase the friction between the gripper and the plug cap when screwing the plug cap, and reduce the difficulty of removing the plug cap.

[0037] To avoid uneven distribution of samples in the sample container due to sample deposition, the sample tray 2 further includes a cam and a vibration driving member connected to the cam. The cam abuts against the lower surface of the sample tray body 21, and the vibration driving member is configured to drive the cam to rotate, so that the sample tray body 21 vibrates up and down under the action of the cam, improving the uniformity of the samples. It should be noted that, in order to enable the sample tray body 21 to vibrate up and down, the sample tray body 21 is connected to the rotating shaft by a sliding key, and when the sample tray body 21 vibrates up and down, the fixed gripper 23 should slightly loosen the sample container so that the sample container vibrates up and down with the sample tray body 21. Moreover, the vibration driving member is also connected to the controller to be intermittently started under the control of the controller.

[0038] Reference Figure 1 As shown, the pipetting assembly 3 includes a pipettor 31, a pipetting needle 32, a second lifting driving member, and a third rotating driving member. The pipetting needle 32 is set in an L shape, and one of its horizontally arranged ends is connected to the pipettor 31. The third rotating driving member is configured to drive the pipetting needle 32 to make a circular motion with the pipettor 31 as the axis. The sampling area is arranged on the movement path of one end of the pipetting needle 32 of one group of pipetting assemblies 3 away from the pipettor 31, the reagent placement area is arranged on the movement path of one end of the pipetting needle 32 of the other group of pipetting assemblies 3 away from the pipettor 31, and the sample liquid mixing area is arranged on the movement paths of one ends of the pipetting needles 32 of the two groups of pipetting assemblies 3 away from the pipettor 31. The second lifting driving member is configured to drive one end of the pipetting needle 32 away from the pipettor 31 to lift and lower, so that one end of the pipetting needle 32 of one group of pipetting assemblies 3 away from the pipettor 31 is inserted into the sample container, and one end of the pipetting needle 32 of the other group of pipetting assemblies 3 away from the pipettor 31 is inserted into the reagent container. The second lifting driving member can also adopt a lifting motor, and the third rotating driving member adopts a rotating motor.

[0039] The pipettor 31 can adopt any one of the electric pipettors in the prior art. For example, as shown in the reference Figure 3 The pipettor 31 includes a sleeve 311, a piston 312, a piston rod 313, and a third lifting driving member 314. The piston rod 313 is arranged vertically, its upper end is connected to the piston 312, and its lower end is connected to the third lifting driving member 314 through a horizontally extending third connecting rod 315. The piston 312 is hermetically and movably arranged in the sleeve 311, and a suction port is arranged at the top of the sleeve 311. The pipetting needle 32 is connected to the suction port. Driven by the third lifting driving member 314, the piston rod 313 drives the piston 312 to move up and down, so that the pipettor 31 sucks or extrudes liquid (including but not limited to samples and reagents).

[0040] Specifically, the third rotation driving member is disposed at the output end of the second lifting driving member. The sleeve 311 of the pipette 31 and the third lifting driving member 314 are both disposed at the output end of the third rotation driving member. Driven by the third rotation driving member, the pipette 31 drives the pipetting needle 32 to rotate together, so that the end of the pipetting needle 32 away from the pipette 31 makes a circular motion. Driven by the second lifting driving member, the pipette 31 drives the pipetting needle 32 to lift and lower together to insert into or disengage from the sample container or the reagent container.

[0041] In other embodiments, the pipetting assembly 3 includes a pipette 31 and a manipulator. The pipette 31 is transferred between the sampling area, the reagent placement area, and the sample liquid mixing area through the manipulator, which will not be elaborated here.

[0042] In one embodiment, a cleaning area is further provided on the base 1. The cleaning area is used to place a cleaning container filled with cleaning liquid. The cleaning area is located on the movement path of the end of the pipetting needle 32 away from the pipette 31 in the pipetting assembly 3 for transferring samples. The pipetting needle 32 in the pipetting assembly 3 can be transferred to the cleaning area and suck the cleaning liquid in the cleaning container to achieve automatic cleaning, thereby reducing the interference of the previous sample on the detection result of the next sample.

[0043] Based on the setting of the cleaning area, a waste liquid area is further provided on the base 1. The waste liquid area is used to place a waste liquid container for holding waste liquid. The waste liquid area is also located on the movement path of the end of the pipetting needle 32 away from the pipette 31 in the pipetting assembly 3 for transferring samples.

[0044] In order to be able to clean the pipetting assembly 3 for transferring reagents, the cleaning area and the waste liquid area can also be located on the movement path of the end of the pipetting needle 32 away from the pipette 31 in the pipetting assembly 3 for transferring reagents.

[0045] Considering that some samples need to be diluted during the detection process, in one embodiment, three groups of pipetting assemblies 3 are provided. In addition to the two groups for transferring samples and transferring reagents, there is also one group for transferring diluent. Correspondingly, a diluent placement area is provided on the base 1, which will not be elaborated here.

[0046] Reference Figure 4 As shown, the sample liquid mixer 4 includes a mixing container 41, a stirring blade 42, and a stirring driving member 43. The mixing container 41 is provided with an opening at the top. The stirring blade 42 is rotatably disposed in the mixing container 41 to fully stir the liquid in the mixing container 41 driven by the stirring driving member 43, so as to mix the sample and the reagent. Specifically, the stirring driving member 43 can adopt a rotary motor, or the stirring blade 42 can also be made of a magnetic material, and the stirring driving member 43 adopts a motor used in cooperation with a magnetic steel. The principle and structure of magnetic stirring both belong to the prior art and will not be elaborated here.

[0047] Reference Figure 5 As shown, in order to stably place the reagent container in the reagent placement area, a positioning component 5 is provided in the reagent placement area. Specifically, the positioning component 5 includes a positioning groove base 51 fixedly arranged on the base 1. A positioning groove with an upward opening is formed in the positioning groove base 51. The positioning component 5 further includes an elastic member and a clamping block 52. An avoidance groove is formed in the positioning groove. The clamping block 52 is connected to the positioning groove base 51 through the elastic member arranged in the avoidance groove. The elastic member provides an elastic force to the clamping block 52, so that the clamping block 52 maintains a tendency to protrude out of the avoidance groove, thereby being able to cooperate with the clamping groove on the reagent container to limit the reagent container.

[0048] Based on the settings of the cleaning area and the waste liquid area, the cleaning area and the waste liquid area are also provided with a positioning component 5 for limiting and fixing the cleaning container and the waste liquid container, which will not be elaborated here.

[0049] Reference Figure 1 and Figure 2 As shown, the automatic sampling device further includes a protective box body 6. The top surface of the protective box body 6 is open, and a movable door is movably connected at the opening. The base 1 is arranged inside the protective box body 6, which can not only avoid external contamination, but also isolate the noise generated during the operation of each functional mechanism during the sampling process, and at the same time can protect against external contamination.

[0050] In order to increase the stability of the automatic sampling device, damping feet 7 are further arranged at the bottom of the base 1. Specifically, the damping feet 7 are made of rubber.

[0051] When the above automatic sampling device works, the sample plate body 21 rotates under the drive of the first rotation drive member 22 until a certain sample container on the sample plate body 21 moves to the sampling area. The open cap gripper 24 cooperates with the fixed gripper 23 to remove the plug cover on the sample container. After a pipetting component 3 sucks the sample in the sample container, it is transferred to the sample liquid mixer 4. Another pipetting component 3 synchronously sucks the reagent in the reagent container in the reagent placement area and then transfers it into the sample liquid mixer 4. The sample liquid mixer 4 stirs the sample liquid (abbreviation for the mixture of sample and reagent) to mix the sample liquid, and then pumps it to the detection device for detection through an injection pump. The whole process is automatically controlled by a controller, reducing the error caused by manual participation and improving the detection accuracy and detection efficiency.

[0052] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. An automatic sampling device, characterized in that, The automatic sampler includes: A base (1), which has a sampling area, a reagent placement area, and a sample solution mixing area; A sample tray (2), which includes a first rotation driving member (22) and a sample tray body (21). A plurality of limiting grooves for placing sample containers containing samples are circumferentially spaced on the sample tray body (21). The sample tray body (21) is rotatably arranged on the base (1) through a rotating shaft, so that any one of the sample containers on the sample tray body (21) rotates to the sampling area. The first rotation driving member (22) is configured to provide the power for the rotation of the sample tray body (21); A sample solution mixer (4), which is arranged in the sample solution mixing area and is configured to mix the sample and the reagent; A pipetting assembly (3), with at least two groups of the pipetting assembly (3). One group of the pipetting assembly (3) is configured to quantitatively aspirate the sample in the sample container located in the sampling area and transfer it to the sample solution mixer (4), and the other group of the pipetting assembly (3) is configured to quantitatively aspirate the reagent in the reagent container located in the reagent placement area and transfer it to the sample solution mixer (4); An injection pump, which is connected to the sample solution mixer (4); A controller, which is communicatively connected to the sample tray (2), the pipetting assembly (3), the sample solution mixer (4), and the injection pump.

2. The automatic sampling device according to claim 1, wherein, The sample tray (2) further includes a fixed gripper (23), which is fixed to the rotating shaft through a connecting rod. A plurality of the fixed grippers (23) are correspondingly arranged above the limiting grooves, and the fixed gripper (23) is configured to fix the sample container in the limiting groove.

3. The automatic sampling device according to claim 2, characterized in that, The automatic sampler further includes an open - cap gripper (24), which is arranged above the sampling area and is configured to open the sample container.

4. The automatic sampling device according to claim 3, wherein, The open - cap gripper (24) includes a first lifting driving member, a second rotation driving member, and a jaw cylinder. The second rotation driving member is arranged at the output end of the first lifting driving member, and the jaw cylinder is arranged at the output end of the second rotation driving member.

5. The automatic sampling device according to claim 1, characterized in that The sample tray body (21) is connected to the rotating shaft by a sliding key. The sample tray (2) further includes a cam and a vibration driving member. The cam abuts against the lower surface of the sample tray body (21). The vibration driving member is configured to drive the cam to rotate, and the vibration driving member is communicatively connected to the controller.

6. The automatic sampling device according to claim 1, wherein The pipetting assembly (3) includes a pipettor (31), a pipetting needle (32), a second lifting drive, and a third rotation drive. The pipetting needle (32) is arranged in an L shape, and the horizontally arranged end of the pipetting needle (32) is connected to the pipettor (31). The third rotation drive is configured to drive the pipetting needle (32) to perform circular motion with the pipettor (31) as the axis. The second lifting drive is configured to drive the pipetting needle (32) and the pipettor (31) to lift and lower. The sampling area is arranged on the movement path of the end of the pipetting needle (32) of one set of the pipetting assemblies (3) away from the pipettor (31). The reagent placement area is arranged on the movement path of the end of the pipetting needle (32) of the other set of the pipetting assemblies (3) away from the pipettor (31). The sample liquid mixing area is arranged on the movement paths of the ends of the pipetting needles (32) of the two sets of the pipetting assemblies (3) away from the pipettor (31).

7. The automatic sampling device according to claim 6, wherein A cleaning area is further arranged on the base (1). The cleaning area is used for placing a cleaning container filled with cleaning liquid. The cleaning area is located on the movement path of the end of the pipetting needle (32) of the pipetting assembly (3) for transferring the sample away from the pipettor (31).

8. The automatic sampling device according to claim 7, wherein A waste liquid area is further arranged on the base (1). The waste liquid area is used for placing a waste liquid container for holding waste liquid. The waste liquid area is located on the movement path of the end of the pipetting needle (32) of the pipetting assembly (3) for transferring the sample away from the pipettor (31).

9. The automatic sampling device according to claim 1, wherein A positioning assembly (5) is arranged in the reagent placement area. The positioning assembly (5) includes a positioning groove seat (51), an elastic member, and a clamping block (52). The positioning groove seat (51) is fixedly arranged on the base (1) and is provided with a positioning groove with an upward opening. An avoidance groove is arranged in the positioning groove. The clamping block (52) is connected to the positioning groove seat (51) through the elastic member arranged in the avoidance groove. The elastic member provides an elastic force to the clamping block (52) to keep the clamping block (52) in a tendency to extend out of the avoidance groove.

10. The automatic sampling device according to claim 1, wherein, The automatic sampling device further includes a protective box body (6). The base (1), the sample tray (2), the pipetting assembly (3), and the sampling pump are all located inside the protective box body (6).

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