A reaction tube automatic sample adding system

Abstract

The present invention discloses an automatic sample loading system for a reaction tube, comprising a mounting plate, on which a centrifugal disk for placing a reaction tube, a dilution disk for placing a biochemical cup, and a sample disk for placing a sample container are mounted and rotated; the reagent loading mechanism is used to automatically absorb the reagent B in the reagent B box on the mounting plate, and then add it to the reaction tube; the dilution loading mechanism is used to automatically absorb the reagent A in the reagent A box on the mounting plate, and then add it to the biochemical cup, and to automatically absorb the liquid in the biochemical cup and add it to the reaction tube; the sample loading mechanism is used to automatically absorb the sample in the sample container and add it to the biochemical cup. The automatic sample loading system for a reaction tube disclosed by the present invention can realize the sequential addition of corresponding solutions into the reaction tube, and each action is fully automated, and after the sample loading is completed, there is no need to manually transfer the reaction tube, and the sample loading efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of medical testing instruments, in particular to an automatic sample adding system for a reaction tube. Background Art

[0002] In the medical testing instruments of the in vitro diagnostic industry, the degree of automation of the solution sample addition instrument in the reaction tube is not high. In the traditional sample addition operation, it relies on complete manual sample addition, manual transfer of the reaction tube or the use of a semi-automatic sample addition instrument to complete the sample addition operation, but it is still necessary to manually place the sampled reaction tubes into the centrifugal disk in turn for batch rotation and mixing operations. This traditional method requires manual operation for each sample addition, which is not only cumbersome, but also the manual transfer operation is easy to interfere with the sample. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in order to overcome the defects of the prior art, an automatic reaction tube loading system is provided, which can realize the sequential addition of corresponding solutions into the reaction tubes, each action is fully automated, and after the loading is completed, there is no need to manually transfer the reaction tubes, and the loading efficiency is high.

[0004] The technical solution adopted by the present invention is: to provide a reaction tube automatic sample loading system, comprising a mounting plate, on which a centrifugal disk for placing reaction tubes, a dilution disk for placing biochemical cups, and a sample disk for placing sample containers are provided; the mounting plate is also provided with:

[0005] The reagent adding mechanism is fixedly connected to the mounting plate and is used to automatically absorb the reagent B in the reagent B box on the mounting plate and then add it to the reaction tube;

[0006] The dilution and sample adding mechanism is used for automatically sucking the reagent A in the reagent A box on the mounting plate and then adding it to the biochemical cup, and for automatically sucking the liquid in the biochemical cup and adding it to the reaction tube;

[0007] The sample adding mechanism is used for automatically sucking the sample from the sample container and adding it into the biochemical cup.

[0008] Compared with the prior art, the present invention has the following advantages:

[0009] The automatic sample loading system for reaction tubes of the present invention is equipped with a corresponding reaction tube placement plate, sample loading mechanisms for various corresponding solutions and a solution storage container on a mounting plate. The sample loading process is fully automated, realizing a series of operations such as smooth sample loading, dilution and mixing, thereby greatly improving the stability of the reaction tubes and the work efficiency of operators.

[0010] Furthermore, the reagent loading mechanism, the dilution loading mechanism and the sample loading mechanism have the same structure, and all include a support frame and a connecting arm, the connecting arm is provided with a loading assembly, and the support frame is also provided with a lifting drive assembly for driving the connecting arm to lift and lower, and a rotation drive assembly for driving the connecting arm to swing horizontally. In this structure, the movement of the loading assembly is achieved by lifting or rotating the corresponding connecting arm, and the structure is simple and easy to drive.

[0011] Preferably, the sample addition assembly includes a sample addition needle and a pump, wherein the sample addition needle is vertically mounted on one end of the connecting arm; the pump is mounted on the connecting arm or the mounting plate to drive the sample addition needle to absorb or release the solution. In this preferred structure, the sample addition needle cooperates with the pump to achieve the aspiration of the solution, which is convenient to control and simple to operate.

[0012] As an improvement, the lifting drive assembly includes a first conveyor belt and a first driver that drives the first conveyor belt to run in a vertical direction, a lifting rod is provided at one end of the connecting arm away from the sample injection needle, the lower end of the lifting rod is connected to the first conveyor belt, and a limiting hole for the lifting rod to pass through is provided at the upper end of the support frame. In this improved structure, the lifting rod is used to drive the connecting arm to rise and fall, and the lifting rod is slidably matched in the limiting hole of the support frame, thereby increasing the stability of the lifting.

[0013] In a further improvement, the rotation drive assembly includes a second conveyor belt and a second driver, the second driver is mounted on the support frame, and the output shaft of the second driver is provided with a second driving wheel, a connecting sleeve is rotatably provided in the limiting hole, a second driven wheel is provided at the upper end of the connecting sleeve, and the second driven wheel sleeve is provided on the outside of the lifting rod; the outer wall of the lifting rod is provided with a guide groove extending along its axial direction, and the inner wall of the connecting sleeve is provided with a guide protrusion matching the guide groove. In this improved structure, a corresponding guide groove is provided on the outer wall of the lifting rod, and a guide protrusion is provided on the connecting sleeve. When the lifting rod slides vertically, the guide protrusion can play a guiding role to ensure that the lifting rod will not deflect when sliding up and down; when the connecting sleeve rotates, the limiting protrusion can also play a linkage role to drive the lifting rod to rotate synchronously.

[0014] Further improved, the mounting plate is also provided with a needle washing mechanism for automatically washing the sample adding needle after adding the sample. This improved structure is used to wash the sample adding needle after each sample addition to keep the outer surface of the sample adding needle clean and tidy.

[0015] Preferably, the needle washing mechanism comprises a needle washing tank, and at least one liquid spray pipe and a negative pressure suction pipe are provided on the side wall of the needle washing tank, and the ends of the liquid spray pipe and the negative pressure suction pipe extend toward the middle of the needle washing tank; and a water outlet channel is provided at the bottom of the needle washing tank. In this structure, corresponding liquid spray pipes and negative pressure suction pipes are provided in the needle washing tank to achieve flushing of the outer surface of the sample needle and water droplet adsorption, which is simple and effective.

[0016] Further improved, the mounting plate is provided with a first detection unit for detecting the rotation angle of the centrifugal disk, the dilution disk and the sample disk respectively; the support frame is provided with a second detection unit for detecting the rotation angle of the connecting arm; the first sensing unit and the second sensing unit are both connected to the main controller signal of the sample loading system, and the main controller is used to control the operation of each driving component. This improved structure is mainly used to detect and control the rotation angle of each driving turntable to ensure automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of a reaction tube automatic sample adding system of the present invention.

[0018] Figure 2 The present invention is a top view of a reaction tube automatic sample adding system.

[0019] Figure 3 This is a structural diagram from another angle of a reaction tube automatic sample adding system of the present invention.

[0020] Figure 4 It is a structural diagram of the reagent loading mechanism, the dilution loading mechanism, and the sample loading mechanism in the present invention.

[0021] Figure 5 This is a structural diagram from another angle of a reaction tube automatic sample adding system of the present invention.

[0022] Figure 6 This is a structural diagram from another angle of a reaction tube automatic sample adding system of the present invention.

[0023] Among them, 01-reagent loading mechanism, 02-dilution loading mechanism, 03-sample loading mechanism, 04-needle washing mechanism;

[0024] 1-mounting plate, 2-centrifugal disk, 2.1-first receiving tank, 3-dilution disk, 3.1-second receiving tank, 4-sample disk, 4.1- The third accommodating groove, 5-reagent B box, 6-reagent A box, 7-support frame, 8-connecting arm, 9-sample adding needle, 10-first conveyor belt, 11-first driver, 12-lifting rod, 12.1-guide groove, 13-second conveyor belt, 14-second driver, 15-second driving wheel, 16-connecting sleeve, 17-second driven wheel, 18-needle washing groove, 19-spray pipe, 20-negative pressure pipette, 21-first driving shaft, 22-first driven shaft, 23-fixed block, 24-first photoelectric signal sensor, 25-first chopping piece, 26-second chopping piece, 27-second photoelectric signal sensor, 28-driving motor, 29-third conveyor belt, 30-connecting shaft, 31-third driven wheel, 32-sawtooth chopping piece, 33-third photoelectric signal sensor, 34-reset chopping piece, 35-reset optical coupler. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] In the description of the present invention, it should be noted that the terms "upper end", "lower end", "outer side wall", "inner side wall" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. In addition, in the description of the present invention, the terms "first", "second", and "third" are only for the convenience of description and distinction, and have no specific meaning.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figure 1 , 2As shown, a reaction tube automatic loading system provided by the present invention comprises a mounting plate 1, on which a centrifugal disc 2, a dilution disc 3 and a sample disc 4 are sequentially arranged along the circumferential direction, wherein a plurality of first receiving grooves 2.1 for inserting reaction tubes are circumferentially arranged on the centrifugal disc 2, a plurality of second receiving grooves 3.1 for positioning biochemical cups are circumferentially arranged on the dilution disc 3; a plurality of third receiving grooves 4.1 for placing sample containers are circumferentially arranged on the sample disc 4, and the centrifugal disc 2, the dilution disc 3 and the sample disc 4 are all rotatably connected to the mounting plate 1 along the circumferential direction, that is, as each turntable rotates, the reaction tubes, biochemical cups and sample containers are sequentially transferred to corresponding operating stations, thereby ensuring automated flow work.

[0029] like Figure 2 As shown, a reagent loading mechanism 01 is arranged between the centrifugal disk 2 and the sample disk 4 on the mounting plate 1, and a reagent B box 5 for accommodating reagent B is arranged close to the reagent loading mechanism 01 on the mounting plate 1; a dilution loading mechanism is arranged between the centrifugal disk 2 and the dilution disk 3, and a reagent A box 6 for accommodating reagent A is also arranged close to the dilution loading mechanism 02 on the mounting plate 1; and a sample loading mechanism 03 is also arranged between the dilution disk 3 and the sample disk 4.

[0030] The following is an explanation of the action process of each loading mechanism in combination with the loading steps of various liquids in the reaction tube:

[0031] First, the reagent adding mechanism 01 is used to automatically suck the reagent B in the reagent B box 5 and add it to the corresponding sample tube on the centrifugal disk 2;

[0032] At the same time, the dilution and sample adding mechanism 02 is used to automatically absorb the reagent A in the reagent A box 6 and then add it to the corresponding biochemical cup on the dilution plate 3;

[0033] Then, the sample adding mechanism 03 is used to absorb the sample in the corresponding sample container on the sample disk 4, and then add it to the corresponding biochemical cup on the dilution disk 2, and the biochemical cup to which the sample is added in this step is the same biochemical cup to which the reagent A is added in the previous step, and as the dilution disk 3 rotates, the reagent A and the sample are added to the same biochemical cup each time;

[0034] After adding reagent A and sample to the corresponding biochemical cup, the dilution loading mechanism 02 performs loading again. This loading process is to absorb the mixed dilution liquid in the corresponding biochemical cup on the dilution disk 3 and add it to the reaction tube on the centrifugal disk 2 to which reagent B has been added, thereby completing the loading and mixing of all liquids in one reaction tube.

[0035] The entire sample addition process is automatically performed through a specific sample addition mechanism, and no manual sample addition is required in the intermediate process, so the operation is precise and the sample addition efficiency is high.

[0036] In addition, the reagent loading mechanism 01, the dilution loading mechanism 02 and the sample loading mechanism 03 involved in the above loading process have the same structure, except for the different solutions used for loading. They all include a support frame 7 and a connecting arm 8, on which a loading assembly is provided, and the support frame 7 is also provided with a lifting drive assembly for driving the connecting arm 8 to lift and lower, and a rotation drive assembly for driving the connecting arm 7 to swing horizontally. The loading assembly in this structure includes a loading needle 9 and a pump (not shown in the figure), the pump can be a syringe pump or a plunger pump; and the loading needle 9 is vertically mounted at one end of the connecting arm 8; the pump is mounted on the connecting arm 8 to drive the loading needle 9 to absorb or release the solution. In other embodiments, the pump can also be mounted on the mounting plate 1.

[0037] In the structure of the present invention, a corresponding sample adding adjustment component is arranged on each connecting arm 8, and different sample adding mechanisms have their own set sample adding ranges during the sample adding process, thereby ensuring the accuracy of sample adding.

[0038] More specifically, Figure 4 As shown, the lifting drive assembly involved in the above structure includes a first conveyor belt 10 and a first driver 11 driving the first conveyor belt 10 to run in the vertical direction. A lifting rod 12 is provided at one end of the connecting arm 8 away from the sample needle 9. The lower end of the lifting rod 12 is connected to the first conveyor belt 10. The upper end of the support frame 7 is provided with a limit hole for the lifting rod 12 to pass through. In this structure, the first driver 11 is a stepper motor, and the stepper motor is installed at the lower end of the support frame 7 in the horizontal direction. The output shaft of the stepper motor is connected to the first driving shaft 21, and the upper end of the support frame 7 is connected to the first driven shaft 22. The two ends of the first transmission belt 10 are respectively matched on the outer side walls of the first driving shaft 21 and the first driven shaft 22. The lower end of the lifting rod 12 is connected to the first conveyor belt 10 through a fixing block 23; thereby realizing the up and down movement of the connecting arm 8 controlled by the stepper motor, and according to the characteristics of the stepper motor, the lifting height of the lifting rod 12 can be basically controlled.

[0039] In order to further improve the control accuracy, in this embodiment, Figure 4As shown, a corresponding first photoelectric signal sensor 24 is connected to the upper end of the support frame 7, and a first chopper 25 corresponding to the first photoelectric sensor 24 is provided on the side wall of the fixed block 23, that is, when the lifting rod 12 moves upward to a set height, the first chopper 25 on the side wall of the fixed block 23 is matched in the groove of the first photoelectric signal sensor 24. After receiving the information, the first photoelectric signal sensor 24 transmits the signal to the main controller of the entire sample loading system. At this time, the main controller can control the first driver 11 to stop. Of course, in this structure, the rising height of the lifting rod 12 can also be preliminarily controlled by a stepper motor. After adding a corresponding photoelectric signal control mechanism, the control accuracy is further improved. In this structure, the position of the first chopper 25 in the groove of the first photoelectric sensor 24 is the initial position, which is also the power-on reset position.

[0040] On the other hand, the rotation drive assembly includes a second conveyor belt 13 and a second driver 14, the second driver 14 is mounted on the support frame 7, and a second driving wheel 15 is provided on the output shaft of the second driver 14, and a connecting sleeve 16 is rotatably provided in the limiting hole, specifically, the connecting sleeve 16 is rotatably matched with the support frame 7 through corresponding bearings; a second driven wheel 17 is provided at the upper end of the connecting sleeve 16, and the second driven wheel 17 is sleeved on the outside of the lifting rod 12; a guide groove 12.1 extending along the axial direction is provided on the outer side wall of the lifting rod 12, and a guide protrusion matching the guide groove 12.1 is provided on the inner side wall of the connecting sleeve 16. In this structure, the lifting shaft 12 rotates with the rotation of the connecting sleeve 16 by the matching of the guide protrusion on the connecting sleeve 16 with the guide groove 12.1 on the outer side wall of the lifting rod 12.

[0041] In this mechanism, a first signal detection unit for the rotation angle of the connecting arm 5 is also provided on the support frame 7. Specifically, a second chopping piece 26 is connected to the lower end of the connecting sleeve 16, and a second photoelectric signal sensor 27 corresponding to the second chopping piece 26 is provided on the support frame 7. A plurality of corresponding notches are provided on the second chopping piece 26, and the plurality of notches respectively correspond to the angles of the left and right rotation of the connecting arm 5. As the second driver 14 drives the lifting shaft 12 to rotate, the connecting sleeve 16 rotates synchronously, thereby realizing the rotation of the second chopping piece 26. The second photoelectric signal sensor 27 senses the notch position on the second chopping piece 26 to realize the control of the rotation angle of the connecting arm 5, that is, the corresponding sample injection needle 9 is switched back and forth between the solution absorbing station and the solution releasing station, and each time it can accurately rotate to the corresponding station angle.

[0042] On the other hand, Figure 1As shown, a needle washing mechanism 04 is also provided on the mounting plate 1, which is used to automatically wash the sample adding needle 9 after the sample is added. Specifically, the needle washing mechanism 04 includes a needle washing tank 18, and at least one liquid spray pipe 19 and a negative pressure suction pipe 20 are provided on the side wall of the needle washing tank 18, and the ends of the liquid spray pipe 19 and the negative pressure suction pipe 20 extend toward the middle position of the needle washing tank 18; a water outlet channel is provided at the bottom of the needle washing tank 18. In this embodiment, three liquid spray pipes 19 and a negative pressure suction pipe 20 are arranged on the side wall of the needle washing tank 18, and the three liquid spray pipes 19 and the negative pressure suction pipe 20 are arranged in a ring shape, and a needle washing space is reserved between them. And the liquid spray pipe 19 is connected to an external liquid storage tank, and the negative pressure suction pipe 20 is connected to an external negative pressure generator. After the sample needle 9 completes each sample addition, it moves to the center of the needle washing tank 18, and the flushing liquid is transported toward the sample needle 9 through the liquid bumping tube 19 to flush the outer wall of the sample needle 9. During this process, the flow rate of the flushing liquid is slowly controlled. After the flushing is completed, the liquid remaining on the outer wall and the needle can be sucked away by the negative pressure suction tube 20 to ensure that there is no residue on the sample needle 9. In addition, in this structure, the water outlet channel is preferably arranged at the bottom middle position of the needle washing tank 18, that is, when the sample needle 9 is flushed, the flushing liquid can slide along the outer wall of the sample needle 9 and directly drip at the water outlet channel position, which is more convenient for the discharge of the flushing liquid.

[0043] like Figure 3 As shown, driving mechanisms for driving the centrifugal disc 2, the dilution disc 3 and the sample disc 4 to rotate are respectively provided at the lower end of the mounting plate 1. The driving mechanisms of the rotating discs are of the same structure, and all include a driving motor 28 and a third conveyor belt 29. The driving motor 28 is preferably a stepping motor, wherein a third driving wheel (not shown in the figure) is connected to the output shaft of the stepping motor. Three connecting shafts 30 are respectively penetrated on the mounting plate 1, and the centrifugal disc 2, the dilution disc 3 and the sample disc 4 are respectively connected to the upper ends of the three connecting shafts 31, and the lower ends of the connecting shafts 30 are connected to the third driven wheels 31, and the two ends of the third transmission belt 29 are respectively mounted on the outer side walls of the third driving wheel and the third driven wheel 31.

[0044] In the above-mentioned driving structure, in order to realize the precise control of the rotation angle of each turntable, a first signal detection unit for detecting the rotation angle of the centrifuge disk 2, the dilution disk 3 and the sample disk 4 is respectively provided on the mounting plate 1; a second signal detection unit for detecting the rotation angle of the connecting arm 5 is provided on the supporting frame 4; the first signal detection unit and the second signal detection unit are both connected to the main controller signal of the sample loading system, and the main controller is used to control the operation of each driving component.

[0045] Specifically, Figure 5As shown, a corresponding sawtooth chopper 32 is coaxially mounted on the connecting shaft 30 connected to each rotating disk, and a third photoelectric signal sensor 33 for detecting the sawtooth convex structure on the sawtooth chopper 32 is correspondingly provided on the mounting plate 1, that is, as each rotating disk rotates, the corresponding sawtooth chopper 32 on the connecting shaft 30 rotates synchronously, and each time the sawtooth convex structure rotates by an angle until the sawtooth convex structure is located in the sensing groove of the third photoelectric signal sensor 33, the third photoelectric signal sensor 33 can both receive the signal and transmit the signal to the main controller, and the main controller controls the corresponding drive motor 28 to stop, and then performs the subsequent solution addition action. When the addition of the sample in one reaction tube is completed, the main controller continues to control the drive motor 28 to rotate by an angle to the position where the next reaction tube is added, and so on and so forth, so that the addition of the sample is completed in each reaction tube on the centrifugal disk 2, and the whole process is precisely controlled, the action is coherent, and the degree of automation is high.

[0046] In addition, such as Figure 6 As shown, a reset chopper 34 and a reset optical coupler 35 fixed on the mounting plate 1 are coaxially mounted on the connecting shaft 30 located at the lower end portion of the mounting plate 1, and the reset optical coupler 35 is connected to the main controller signal. Each time the machine is turned on or a fault alarm occurs, the output shaft of the drive motor 28 is located in the initial position through the detection induction of the reset optical coupler 35 and the reset chopper 34, thereby ensuring that the third photoelectric signal sensor 33 can accurately find the signal of the corresponding sawtooth-shaped protrusion structure.

[0047] The above is an explanation of the preferred embodiments of the present invention, but it cannot be understood as a limitation of the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A reaction tube automatic sample loading system, comprising a mounting plate (1), characterized in that: The mounting plate (1) is provided with a centrifugal plate (2) for placing reaction tubes, a dilution plate (3) for placing biochemical cups, and a sample plate (4) for placing sample containers; the mounting plate (1) is also provided with: A reagent loading mechanism (01) is fixedly connected to the mounting plate (1) and is used to automatically absorb the reagent B in the reagent B box (5) on the mounting plate (1) and then add it to the reaction tube; The dilution and sample adding mechanism (02) is used to automatically absorb the reagent A in the reagent A box (6) on the mounting plate (1) and then add it to the biochemical cup, and to automatically absorb the liquid in the biochemical cup and add it to the reaction tube; The sample adding mechanism (03) is used to automatically suck the sample from the sample container and add it to the biochemical cup; The reagent loading mechanism (01), the dilution loading mechanism (02) and the sample loading mechanism (03) have the same structure, and all include a support frame (7) and a connecting arm (8). The connecting arm (8) is provided with a loading assembly. The support frame (7) is also provided with a lifting drive assembly for driving the connecting arm (8) to lift and lower, and a rotation drive assembly for driving the connecting arm (8) to swing horizontally. The loading assembly includes a loading needle (9) and a pump. The loading needle (9) is vertically mounted on one end of the connecting arm (8). The pump is mounted on the connecting arm (8) or the mounting plate (1) to drive the loading needle (9) to absorb or release the solution. The lifting drive assembly includes a first conveyor belt (10) and a first driver (11) for driving the first conveyor belt (10) to run in the vertical direction. The connecting arm (8) is away from the loading needle (9). A lifting rod (12) is provided at the end, the lower end of the lifting rod (12) is connected to the first conveyor belt (10), and the upper end of the support frame (7) is provided with a limiting hole for the lifting rod (12) to pass through; the rotation drive component comprises a second conveyor belt (13) and a second driver (14), the second driver (14) is installed on the support frame (7), and a second driving wheel (15) is provided on the output shaft of the second driver (14), a connecting sleeve (16) is rotatably provided in the limiting hole, a second driven wheel (17) is provided at the upper end of the connecting sleeve (16), and the second driven wheel (17) is sleeved on the outside of the lifting rod (12); a guide groove (12.1) extending along its axial direction is provided on the outer side wall of the lifting rod (12), and a guide protrusion matching the guide groove (12.1) is provided on the inner side wall of the connecting sleeve (16); The mounting plate (1) is provided with a first signal detection unit for detecting the rotation angles of the centrifuge disk (2), the dilution disk (3) and the sample disk (4) respectively; the support frame (7) is provided with a second signal detection unit for detecting the rotation angle of the connecting arm (8); the first signal detection unit and the second signal detection unit are both connected to the main controller signal of the sample loading system, and the main controller is used to control the operation of each driving component.

2. The reaction tube automatic sample loading system according to claim 1, characterized in that: The mounting plate (1) is also provided with a needle washing mechanism (04) for automatically washing the sample adding needle (9) after sample addition.

3. The reaction tube automatic sample loading system according to claim 2, characterized in that: The needle washing mechanism (04) comprises a needle washing trough (18), and at least one liquid spray pipe (19) and a negative pressure suction pipe (20) are provided on the side wall of the needle washing trough (18), and the ends of the liquid spray pipe (19) and the negative pressure suction pipe (20) both extend toward the middle position of the needle washing trough (18); and a water outlet channel is provided at the bottom of the needle washing trough (18).

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