A quantitative sampling device

Abstract

The utility model relates to the technical field of quantitative sample addition, and discloses a quantitative sample addition device, including a bottom plate, two ends of the bottom plate are provided with relative support plates, a reagent cartridge is provided between the two support plates, a storage cavity is provided in the reagent cartridge, a sliding groove is provided on the reagent cartridge, a card slot is provided on the slide, a plurality of round holes are provided on the sliding groove, a sliding plate is provided in the sliding groove, a plurality of dosing tubes are provided on the sliding plate, a dosing cavity with openings at both ends is provided in the dosing tube, a driving component is provided on a support plate located on one side, an opening and closing component is provided at the lower end of the dosing cavity, and a control component is also provided between the two support plates. Through the above-mentioned structure, the control component can simultaneously release the closure of multiple dosing cavities, so that the reagents in the dosing cavities can flow into the corresponding test tubes synchronously and react with the samples in the test tubes, thereby avoiding the unequal reaction time between the reagents and the samples in the multiple test tubes, and thus inconvenience for the staff to conduct multiple groups of control tests.

Description

Technical Field

[0001] The utility model relates to the technical field of sample adding equipment, in particular to a quantitative sample adding equipment. Background Art

[0002] In medical testing, it is usually involved in sampling and testing of drugs and body fluids. In the test, it is usually necessary to add the extracted sample to a test tube, and then add a quantitative explicit reagent to verify the composition or content of the collected sample. Usually, the extracted sample is pipetted into the test tube, and then a quantitative explicit reagent is added to the test tube to observe the reaction of the sample after mixing, so as to determine whether the sample contains the substance to be tested. In actual testing, multiple groups of similar control groups will be set up for one test to improve the accuracy of the test; in existing multi-group control tests, in order to ensure that the test results of multiple groups of control tests can be displayed in the same time period, it is convenient to compare multiple test tubes. When adding samples to the test tubes of multiple groups of control tests, it is necessary to ensure that the time intervals before and after the addition of samples to the multiple test tubes are not too different.

[0003] For example, a quantitative sample adding device for medical examination disclosed in the patent with authorization announcement number CN213148965U, although the quantitative sample adding device for medical examination fixes the connecting sleeve to the outside of the sample adding tube by screwing, and the flange can be clamped and fixed by setting the locking bolt, thereby realizing the connection between the flange and the connecting block, and the connecting block can be positioned by setting the threaded rod, the threaded sleeve and the scale line, thereby realizing the quantitative addition of the sample liquid; however, when the quantitative sample adding device for medical examination conducts multiple groups of control tests, the sample adding tube can only add the explicit reagent to one test tube at a time. After the sample adding tube adds the explicit reagent to the samples in multiple test tubes, the reaction time of the sample in each test tube with the explicit reagent is not equal, resulting in different reaction results between the sample in each test tube and the explicit reagent, thereby inconvenience for the staff to conduct multiple groups of control tests. Utility Model Content

[0004] The purpose of the utility model is to provide a quantitative sample adding device to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The cam is provided with a plurality of support plates at two ends of the bottom plate, and a reagent cartridge is provided between the two support plates, a storage cavity for storing reagents is provided in the reagent cartridge, a sliding groove with openings at both ends is provided on the side wall of the reagent cartridge facing the bottom plate along its length direction, a card slot is provided on the side wall opposite to the sliding groove along its length direction, a plurality of circular holes connecting the storage cavity are provided on the side wall of the sliding groove along its length direction, a sliding plate is provided in the sliding groove which is inserted into the corresponding card slots at both sides, a plurality of dosing tubes are provided on the sliding plate along its length direction and one end of the dosing tubes extends out of the sliding groove, a dosing cavity with openings at both ends is provided in the dosing tubes, a driving assembly is provided on the support plate on one side, the driving assembly is used to drive the sliding plate to move so as to realize the opening and closing of the sliding plate to the circular hole, an opening and closing assembly is provided at the lower end of the dosing cavity for opening and closing the lower end opening of the dosing cavity, and a control assembly is also provided between the two support plates, the control assembly is used to open and close the lower end opening of the dosing cavity by the plurality of opening and closing assemblies.

[0007] Preferably, a mounting seat is provided on a side wall of the sliding plate facing the bottom plate and at one end thereof;

[0008] The driving assembly includes a rotatable threaded rod arranged on a mounting seat, a thread at one end of the threaded rod penetrates a supporting plate, and a hand-cranked wheel is provided at the protruding end of the threaded rod for driving the threaded rod to rotate. The hand-cranked wheel drives the threaded rod to rotate and drives the mounting seat to move, thereby realizing the movement of the sliding plate to open and close the circular hole.

[0009] Preferably, a sleeve is provided at the lower end of the medicine adding chamber, and a cavity with openings at both ends is provided in the sleeve;

[0010] The opening and closing assembly includes a lap plate which is arranged in the medicine adding cavity and is movable. The lap plate is provided with an opening and closing cylinder with one end extending out of the cavity. A cavity opening downward is provided in the opening and closing cylinder. A plurality of slots connecting the cavities are provided at the upper end of the opening and closing cylinder along its circumference. A driving member is also provided in the sleeve. The driving member is used to drive the lap plate to move downward so that the lower end of the lap plate is pressed against the upper end surface of the sleeve.

[0011] Preferably, a plurality of mounting grooves are provided on the lower end surface of the sleeve along its circumference, a fixing ring is sleeved on the side wall of the opening and closing tube extending out of the cavity, a plurality of fixing rods are provided on the fixing ring along its circumference and one end of the fixing rods extends into the corresponding mounting grooves, a fixing plate is provided on the fixing rods located in the mounting grooves, and an interception ring for intercepting the fixing plate is provided at the opening of the mounting grooves;

[0012] The driving member comprises a spring arranged in the mounting groove, and the spring is used for pushing the fixing plate to approach the intercepting ring.

[0013] Preferably, a cone cylinder is provided on the lower end surface of the fixing plate, and a cone cavity with openings at both ends is provided in the cone cylinder.

[0014] Preferably, the control assembly includes a connecting plate disposed between the two supporting plates, and an upper end surface of the connecting plate is connected to a corresponding fixing ring.

[0015] Preferably, a placement rack for placing test tubes is provided between the two support plates.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. In the utility model, since the opening and closing component opens and closes the lower end of the medicine adding chamber, the control component simultaneously controls multiple opening and closing components to release the closure of the medicine adding chamber, so that the medicine in the medicine adding chamber can flow into the corresponding test tube synchronously to react with the sample. Compared with the existing ones, this quantitative sample adding device can add the reagents in multiple medicine adding chambers to multiple test tubes at the same time during actual use, and react synchronously with the samples in the multiple test tubes, thereby avoiding too large time interval difference in adding the reagents to the multiple test tubes, which makes it inconvenient for the staff to conduct multiple groups of control tests.

[0018] 2. The utility model places the test tubes on the corresponding placement racks in sequence. When the mounting seat abuts against the support plate, the opening and closing tubes correspond to the test tubes on the placement rack in sequence, so that the reagents in the cavities can flow into the corresponding test tubes at the same time to react with the samples, thereby facilitating the addition of reagents to multiple test tubes at the same time, which is more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a structural schematic diagram of a quantitative sample adding device.

[0020] Figure 2 It is a schematic diagram of the structure of the reagent cartridge in the utility model.

[0021] Figure 3 It is a schematic diagram of the structure in which the sliding plate is installed on the reagent cartridge in the utility model.

[0022] Figure 4 It is a schematic cross-sectional structural diagram of the reagent cartridge and the sliding plate in the utility model.

[0023] Figure 5 for Figure 4 Schematic diagram of the enlarged structure at point A in the middle.

[0024] The meaning of the symbols in the figure is:

[0025] 100, bottom plate; 110, support plate; 120, reagent cartridge; 130, hand-cranked wheel; 140, connecting plate; 150, dosing tube; 160, placement rack; 170, plug;

[0026] 201, sliding slot; 202, card slot; 203, round hole; 210, limit block;

[0027] 300, sliding plate; 301, mounting seat; 310, threaded rod; 320, cone;

[0028] 401, storage chamber; 402, medicine adding chamber;

[0029] 500, sleeve; 510, lap plate; 511, opening and closing tube; 512, cavity; 513, notch; 521, mounting groove; 530, fixing ring; 531, fixing rod; 532, fixing plate; 540, intercepting ring; 550, spring; 561, conical cavity. DETAILED DESCRIPTION

[0030] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are only used to explain the utility model but not to limit it.

[0031] The following is combined with Figure 1-Figure 5 This embodiment is described in further detail.

[0032] like Figure 1 As shown, a quantitative sample addition device in this embodiment includes a bottom plate 100, and opposite support plates 110 are provided at the two ends of the bottom plate 100. A reagent cartridge 120 is provided between the two support plates 110. A storage cavity 401 for storing reagents is provided in the reagent cartridge 120. A sliding groove 201 with openings at both ends is provided on the side wall of the reagent cartridge 120 facing the bottom plate 100 along its length direction. A card slot 202 is provided on the side wall opposite to the sliding groove 201 along its length direction. A plurality of circular holes 203 communicating with the storage cavity 401 are provided on the side wall of the sliding groove 201 along its length direction. The sliding groove 201 is provided with card slots 202 on both sides that are inserted into corresponding card slots 203. 2, a plurality of dosing tubes 150 are provided on the sliding plate 300 along its length direction and one end of which extends out of the sliding groove 201, and a dosing cavity 402 with openings at both ends is provided in the dosing tube 150, and a driving component is provided on the support plate 110 located on one side, and the driving component is used to drive the sliding plate 300 to move, so as to realize the opening and closing of the circular hole 203 by the sliding plate 300, and an opening and closing component for opening and closing the lower end opening of the dosing cavity 402 is provided at the lower end of the dosing cavity 402, and a control component is also provided between the two support plates 110, and the control component is used for multiple opening and closing components to open and close the lower end opening of the dosing cavity 402.

[0033] In this embodiment, combined with Figure 2 and Figure 3As shown, the circular hole 203 is arranged opposite to the dosing tube 150, thereby, the driving assembly on one side of the support plate 110 drives the sliding plate 300 to move in the sliding groove 201, so that the dosing chamber 402 in the dosing tube 150 can be connected with the corresponding circular hole 203. At this time, the circular hole 203 is opened, so that the reagent in the storage chamber 401 can enter the dosing chamber 402 through the circular hole 203. When the dosing chamber 402 is filled with the reagent, the driving assembly drives the sliding plate 300 to move again, so that the circular hole 203 and the dosing chamber 402 are staggered with each other. At this time, the sliding plate 300 is closed to the circular hole 203, and the circular hole 203 is closed by the driving assembly. The opening and closing component closes the lower end opening of the medicine adding chamber 402. At this time, the control component simultaneously controls multiple opening and closing components to release the closure of the lower end of the medicine adding chamber 402, so that the reagents in the medicine adding chamber 402 can flow out of the medicine adding chamber 402 synchronously and flow into the corresponding test tube to react with the sample. Compared with the existing ones, this quantitative sample adding device can add the reagents in multiple medicine adding chambers 402 to multiple test tubes at the same time during actual use, and react synchronously with the samples in the multiple test tubes, thereby avoiding too large time difference in adding the reagents to the multiple test tubes, which makes it inconvenient for the staff to conduct multiple groups of control tests.

[0034] The reagent cartridge 120 is provided with a dosing hole, through which the reagent can be injected into the storage chamber 401. A plug 170 for blocking the dosing hole is also installed at the opening of the dosing hole. The dosing hole is blocked by the plug 170, thereby preventing dust outside the reagent cartridge 120 from entering the storage chamber 401 through the dosing hole and contaminating the reagent in the storage chamber 401, thereby affecting actual use.

[0035] The support plate 110 is fixedly mounted at the two ends of the bottom plate 100, and the two ends of the reagent cartridge 120 are fixedly mounted on the corresponding support plate 110, thereby realizing the installation of the reagent cartridge 120;

[0036] Among them, the dosing tubes 150 are fixedly installed on the sliding plate 300, and the installation of the sliding plate 300 in the sliding groove 201 is achieved by inserting the two ends of the sliding plate 300 into the corresponding card slots 202, and the upper end surface of the sliding plate 300 and the bottom wall of the sliding groove 201 are in sliding contact, so as to improve the airtightness of the sliding plate 300 in the sliding groove 201 and prevent the reagent from leaking from the circular hole 203. When the sliding plate 300 moves, it can drive the dosing tube 150 to move, so that the circular hole 203 corresponds to the dosing cavity 402, and the reagent in the storage cavity 401 can enter the dosing cavity 402. When the sliding plate 300 moves again, the dosing cavity 402 and the corresponding circular hole 203 are staggered with each other. At this time, the sliding plate 300 closes the circular hole 203.

[0037] In actual use, when the volume in the medicine adding chamber 402 is fixed, when the medicine adding chamber 402 is filled with reagent, when the reagent in the medicine adding chamber 402 is added to the corresponding test tube, at this time, the amount of reagent added to the test tube is the same, thereby achieving quantitative addition of samples to the test tube.

[0038] like Figure 1-3 As shown, in this embodiment, a mounting seat 301 is provided on the side wall of the sliding plate 300 facing the bottom plate 100 and at one end thereof;

[0039] The driving assembly includes a rotatable threaded rod 310 which is arranged on the mounting seat 301. One end of the threaded rod 310 is threadedly penetrated through the support plate 110. The protruding end of the threaded rod 310 is provided with a hand-cranked wheel 130 for driving the threaded rod 310 to rotate. The hand-cranked wheel 130 drives the threaded rod 310 to rotate and drives the mounting seat 301 to move, thereby realizing the movement of the sliding plate 300 to open and close the circular hole 203.

[0040] In this embodiment, by setting the mounting seat 301, the threaded rod 310 and the hand-cranked wheel 130, the mounting seat 301 is fixedly mounted on the sliding plate 300, and the threaded rod 310 is mounted on the mounting seat 301 through the bearing seat. When the threaded rod 310 is threadedly rotated on the support plate 110, the threaded rod 310 can pull the mounting seat 301 to move, that is, the sliding plate 300 moves, so that the sliding plate 300 opens and closes the circular hole 203.

[0041] The hand-cranked wheel 130 is fixedly mounted on the threaded rod 310, and the hand-cranked wheel 130 can better drive the threaded rod 310 to rotate, thereby facilitating actual use;

[0042] In actual use, a limit block 210 is fixedly installed at one end of the sliding groove 201. When the threaded rod 310 drives the sliding plate 300 to move through the mounting seat 301, one end of the sliding plate 300 abuts against the limit block 210. At this time, the medicine adding chamber 402 and the circular hole 203 are in a state of mutual communication. When the threaded rod 310 drives the sliding plate 300 to move through the mounting seat 301, the mounting seat 301 abuts against the support plate 110. At this time, the medicine adding chamber 402 and the circular hole 203 are in a state of disconnection, so that the sliding plate 300 closes the circular hole 203.

[0043] like Figure 1-5 As shown, in this embodiment, a sleeve 500 is sleeved at the lower end of the medicine adding cavity 402, and a cavity with two ends opened is provided in the sleeve 500;

[0044] The opening and closing assembly includes a lap plate 510 which is arranged in the dosing cavity 402 and is movable. The lap plate 510 is provided with an opening and closing tube 511 with one end extending out of the cavity. The opening and closing tube 511 is provided with a cavity 512 opening downward. The upper end of the opening and closing tube 511 is provided with a plurality of grooves 513 connecting the cavity 512 along its circumference. A driving member is also provided in the sleeve 500, and the driving member is used to drive the lap plate 510 to move downward, so that the lower end of the lap plate 510 is pressed against the upper end surface of the sleeve 500.

[0045] In this embodiment, by setting the sleeve 500, the cavity, the lap plate 510, the opening and closing cylinder 511, the cavity 512, the notch 513 and the driving member, the sleeve 500 is fixedly installed in the cavity, and the opening and closing cylinder 511 is fixedly installed on the lap plate 510. When the sliding plate 300 closes the circular hole 203, the opening and closing cylinder 511 is driven to drive the lap plate 510 to move upward, so that the notch 513 on the opening and closing cylinder 511 can extend out of the cavity and communicate with the medicine adding cavity 402. At this time, the reagent in the medicine adding cavity 402 enters the cavity 512 through the notch 513 and flows into the corresponding test tube from the opening at the lower end of the cavity 512.

[0046] The side wall of the opening and closing cylinder 511 is slidably fitted with the side wall of the cavity. When the opening and closing cylinder 511 moves upward to extend the notch 513 out of the cavity, the reagent in the medicine adding cavity 402 can only enter the cavity 512 from the notch 513 for discharge.

[0047] The outer wall of the lap plate 510 is not in contact with the side wall of the dosing cavity 402, and the diameter of the lap plate 510 is larger than the diameter of the cavity. Therefore, when the lap plate 510 is overlapped on the sleeve 500, the upper opening of the cavity can be closed. At the same time, when the opening drives the lap plate 510 upward, the reagent can enter the cavity 512 through the notch 513.

[0048] In actual use, through the setting of the driving member, when the overlapping plate 510 overlaps the upper end surface of the sleeve 500, the driving member can make the overlapping plate 510 press against the upper end surface of the sleeve 500, thereby avoiding the overlapping plate 510 from being loosely pressed against the sleeve 500, resulting in leakage of the reagent.

[0049] like Figure 1-5 As shown, in this embodiment, a plurality of mounting grooves 521 are provided on the lower end surface of the sleeve 500 along its circumferential direction, and the mounting grooves 521 are arranged along the axial direction of the sleeve 500. A fixing ring 530 is sleeved on the side wall of the opening and closing cylinder 511 extending out of the cavity. A plurality of fixing rods 531 are provided on the fixing ring 530 along its circumferential direction, and one end of the fixing rods 531 extends into the corresponding mounting grooves 521. A fixing plate 532 is provided on the fixing rods 531 located in the mounting grooves 521, and an interception ring 540 for intercepting the fixing plate 532 is provided at the opening of the mounting grooves 521.

[0050] The driving member includes a spring 550 disposed in the mounting groove 521 , and the spring 550 is used to push the fixing plate 532 toward the intercepting ring 540 .

[0051] In this embodiment, by setting the mounting groove 521, the fixing ring 530, the fixing rod 531, the fixing plate 532, the intercepting ring 540 and the spring 550, the fixing ring 530 is fixedly mounted on the opening and closing tube 511, the fixing rod 531 is fixedly mounted on the fixing ring 530, the fixing plate 532 is fixedly mounted on the fixing rod 531, and the intercepting ring 540 is threadedly mounted at the opening of the mounting groove 521. When the spring 550 pushes the fixing plate 532 to approach the intercepting ring 540, the fixing plate 532 drives the fixing rod 531 to move downward, the fixing rod 531 moves downward to drive the fixing ring 530 to move downward, and the fixing ring 530 moves downward to drive the opening and closing tube 511 to move downward, that is, the lap plate 510 moves downward, so that the lap plate 510 is pressed against the sleeve 500.

[0052] In actual use, the fixing plate 532 is intercepted by the interception ring 540 so that the fixing ring 530 can always be located in the installation groove 521, thereby realizing the installation of the fixing plate 532 in the installation groove 521, that is, the spring 550 can always drive the lap plate 510 to press against the sleeve 500.

[0053] like Figure 1-5 As shown, in this embodiment, the control assembly includes a connecting plate 140 disposed between two supporting plates 110 , and the upper end surface of the connecting plate 140 is connected to the corresponding fixing ring 530 .

[0054] In this embodiment, by setting the connecting plate 140, the connecting plate 140 is threadedly connected to the corresponding fixing ring 530 through bolts (not shown in the figure), so that the connecting plate 140 is installed on the corresponding fixing ring 530, and by driving the connecting plate 140 to move up, the fixing ring 530 is synchronously driven to move up, so that the multiple opening and closing cylinders 511 are moved up at the same time, so that the reagent in the medicine adding chamber 402 enters the cavity 512 from the notch 513 synchronously, and enters the test tube to react with the sample at the same time, so as to avoid that when the reagent is added to multiple test tubes to react with the sample, the reaction time of the reagent and the multiple samples is unequal, and it is inconvenient for the staff to conduct multiple groups of control tests;

[0055] By removing the bolts from the fixing ring 530, the fixing rings 530 on the connecting plate 140 can be removed. At this time, by driving one fixing ring 530 upward, a reagent can be added to a test tube, which is convenient for actual use and has strong practicality.

[0056] Among them, a placement rack 160 for placing test tubes is fixedly installed between the two support plates 110. By placing the test tubes on the corresponding placement racks 160 in sequence, when the mounting seat 301 abuts against the support plate 110, at this time, the opening and closing cylinder 511 corresponds to the test tubes on the placement rack 160 in sequence, so that the reagents in the cavity 512 can flow into the corresponding test tubes at the same time to react with the samples, thereby facilitating the addition of reagents to multiple test tubes at the same time;

[0057] In actual use, a cone cylinder 320 is fixedly installed on the lower end surface of the fixed plate 532. A cone cavity 561 with openings at both ends is opened in the cone cylinder 320. The cone cylinder 320 is generally in an upward cone shape. The reagent in the cavity 512 can flow into the corresponding test tube better through the cone cavity 561, and the use effect is better.

[0058] Working principle: First, remove the plug 170, pour the reagent into the storage chamber 401 through the dosing hole, and then seal the dosing hole with the plug 170, and then turn the hand-cranked wheel 130 to make the threaded rod 310 threadedly rotate on the support plate 110, thereby pushing the mounting seat 301 to move, so that one end of the sliding plate 300 abuts against the limit block 210. At this time, the dosing chamber 402 and the circular hole 203 are interconnected, so that the reagent in the storage chamber 401 can enter the storage chamber 401 through the circular hole 203. When the storage chamber 401 is full of medicine, at this time, turn the hand-cranked wheel 130 again, and drive the threaded rod 310 through the hand-cranked wheel 130 to rotate. The threaded rod 310 rotates, thereby pulling the mounting seat 301 to abut against the support plate 110, so that the sliding plate 300 closes the circular hole 203, and then the test tubes are placed in the corresponding placement racks 160 in turn. Finally, by driving the connecting plate 140 to move upward, the fixing ring 530 can drive the opening and closing cylinder 511 to move upward, and the opening and closing cylinder 511 drives the overlapping plate 510 to move upward, so that the reagent in the medicine adding chamber 402 can enter the cavity 512 through the notch 513, and the reagent in the cavity 512 flows into the corresponding test tube at the same time through the cone tube 320, thereby realizing the addition of a certain amount of reagent to multiple test tubes at the same time, so as to reduce the long interval time of adding samples.

[0059] In short, the above is only a preferred embodiment of the present utility model, and all equivalent changes and modifications made according to the scope of the patent application of the present utility model should fall within the scope of the present utility model patent.

Claims

1. A quantitative sampling device, characterized in that: The invention comprises a bottom plate (100), wherein opposite support plates (110) are arranged at both ends of the bottom plate (100), a reagent cartridge (120) is arranged between the two support plates (110), a storage cavity (401) for storing reagents is arranged in the reagent cartridge (120), a sliding groove (201) with openings at both ends is arranged on the side wall of the reagent cartridge (120) facing the bottom plate (100) along its length direction, a clamping groove (202) is arranged on the side wall opposite to the sliding groove (201) along its length direction, a plurality of circular holes (203) communicating with the storage cavity (401) are arranged on the side wall of the sliding groove (201) along its length direction, and sliding grooves (201) are arranged in both sides of the sliding groove (201) and are clamped into the corresponding clamping grooves (202). A plate (300) is provided on the sliding plate (300) along its length direction, and one end of the drug adding tubes (150) extends out of the sliding groove (201). The drug adding tubes (150) are each provided with a drug adding cavity (402) with openings at both ends. A driving component is provided on the support plate (110) located on one side, and the driving component is used to drive the sliding plate (300) to move, so as to realize the opening and closing of the circular hole (203) by the sliding plate (300). An opening and closing component for opening and closing the lower end opening of the drug adding cavity (402) is provided at the lower end of the drug adding cavity (402). A control component is also provided between the two support plates (110), and the control component is used to open and close the lower end opening of the drug adding cavity (402) by the multiple opening and closing components.

2. A quantitative sampling device according to claim 1, characterized in that: A mounting seat (301) is provided on a side wall of the sliding plate (300) facing the bottom plate (100) and at one end thereof; The driving assembly comprises a threaded rod (310) which is rotatably arranged on the mounting seat (301), one end of the threaded rod (310) is threadedly penetrated through the supporting plate (110), and a hand-cranked wheel (130) for driving the threaded rod (310) to rotate is provided at the protruding end of the threaded rod (310), and the hand-cranked wheel (130) drives the threaded rod (310) to rotate and drives the mounting seat (301) to move, so that the sliding plate (300) moves to open and close the circular hole (203).

3. A quantitative sampling device according to claim 1, characterized in that: A sleeve (500) is sleeved at the lower end of the medicine adding cavity (402), and a cavity with openings at both ends is arranged in the sleeve (500); The opening and closing assembly comprises a movably mounted overlapping plate (510) disposed in the medicine adding cavity (402), an opening and closing cylinder (511) having one end extending out of the cavity being disposed on the overlapping plate (510), a cavity (512) opening downwardly being disposed in the opening and closing cylinder (511), a plurality of grooves (513) connecting the cavity (512) being disposed at the upper end portion of the opening and closing cylinder (511) along its circumference, and a driving member being disposed in the sleeve (500), and the driving member being used to drive the overlapping plate (510) to move downward, so that the lower end surface of the overlapping plate (510) is pressed against the upper end surface of the sleeve (500).

4. A quantitative sample addition device according to claim 3, characterized in that: A plurality of mounting grooves (521) are provided on the lower end surface of the sleeve (500) along its circumferential direction, and the mounting grooves (521) are arranged along the axial direction of the sleeve (500). A fixing ring (530) is sleeved on the side wall of the opening and closing cylinder (511) extending out of the cavity. A plurality of fixing rods (531) are provided on the fixing ring (530) along its circumferential direction, and one end of the fixing rods (531) extends into the corresponding mounting grooves (521). A fixing plate (532) is provided on the fixing rods (531) located in the mounting grooves (521), and an interception ring for intercepting the fixing plate (532) is provided at the opening of the mounting grooves (521). The driving member comprises a spring (550) arranged in the mounting groove (521), and the spring (550) is used to push the fixing plate (532) to approach the intercepting ring (540).

5. A quantitative sampling device according to claim 4, characterized in that: A cone cylinder (320) is provided on the lower end surface of the fixing plate (532), and a cone cavity (561) with openings at both ends is provided in the cone cylinder (320).

6. A quantitative sample addition device according to claim 4, characterized in that: The control assembly comprises a connecting plate (140) arranged between two supporting plates (110), and the upper end surface of the connecting plate (140) is connected to a corresponding fixing ring (530).

7. A quantitative sample addition device according to claim 6, characterized in that: A placement rack (160) for placing test tubes is provided between the two support plates (110).

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