Automatic sample feeding and withdrawing device for culture dish

Abstract

The present invention discloses an automatic sample feeding and withdrawing device for culture dishes, which relates to the field of biological sample processing technology. The device comprises a sample feeding and withdrawing mechanism, a driving mechanism, a sample withdrawing and withdrawing mechanism, a gripping mechanism, and a platform base. The sample feeding and withdrawing mechanism is used to place multiple groups of culture dishes to be sampled. The driving mechanism is used to sequentially transport the culture dishes to be sampled in the sample feeding and withdrawing mechanism to the operating position of the platform base. The gripping mechanism is used to sequentially grab the culture dishes on the platform base after sampling and transfer them to the sample withdrawing and withdrawing mechanism. The sample withdrawing and withdrawing mechanism is used to place multiple groups of culture dishes after sampling. The automatic sample feeding and withdrawing device for culture dishes can realize automatic sample feeding and withdrawing of culture dishes, thereby improving efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of biological sample processing, in particular to an automatic sample feeding and withdrawing device for a culture dish. Background Art

[0002] A mass spectrometer is an analytical instrument used in the field of basic medicine. Existing microbial mass spectrometers cannot automatically inject and remove samples from culture dishes. Instead, the injection and removal of samples from culture dishes need to be completed one by one, resulting in low efficiency in injection and removal, which directly affects the processing efficiency of subsequent processes. Summary of the Invention

[0003] The purpose of the present invention is to provide an automatic sample feeding and sample withdrawal device for a culture dish to solve the problems existing in the above-mentioned prior art, and to realize automatic sample feeding and sample withdrawal of the culture dish and improve efficiency.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides an automatic sample feeding and withdrawing device for culture dishes, comprising a sample feeding and storage mechanism, a driving mechanism, a sample withdrawing and storage mechanism, a gripping mechanism, and a platform base. The sample feeding and storage mechanism is used to place multiple groups of culture dishes to be sampled. The driving mechanism is used to sequentially deliver the culture dishes to be sampled in the sample feeding and storage mechanism to the operating position of the platform base. The gripping mechanism is used to sequentially grab the culture dishes on the platform base that have completed sampling and transfer them to the sample withdrawing and storage mechanism. The sample withdrawing and storage mechanism is used to place multiple groups of culture dishes that have completed sampling.

[0006] Preferably, the sampling storage mechanism includes a sampling top cover, a sampling base and a sampling positioning piece, the sampling top cover and the sampling base are arranged up and down and in parallel, the sampling positioning piece is installed between the sampling top cover and the sampling base, and the sampling positioning piece is used to place multiple culture dishes to be sampled, the culture dishes in the sampling positioning piece are stacked up and down, and a lower sampling hole is opened on the sampling base at a position corresponding to the sampling positioning piece, the lower sampling hole can allow the culture dish to pass through, and the culture dish that falls through the lower sampling hole is pushed to the operating position of the platform base by the driving mechanism.

[0007] Preferably, there are three groups of injection positioning members, there are three lower injection holes, and one group of injection positioning members corresponds to one lower injection hole. An upper injection hole is also provided on the injection top cover at a position corresponding to each lower injection hole, and the upper injection hole is used to place the culture dish into the injection positioning member; each of the injection positioning members includes three injection positioning rods, and the three injection positioning rods are evenly fixed on the outer periphery of the lower injection hole, and the culture dish is placed between the three injection positioning rods.

[0008] Preferably, the automatic sample feeding and withdrawing device for culture dishes provided by the present invention also includes a sample feeding motor and a sample feeding photoelectric switch. The sample feeding motor is located at the lower end of the sample feeding chassis, and the sample feeding motor is used to drive the sample feeding storage mechanism to rotate. The sample feeding photoelectric switch is installed on the platform base, and the outer edge of each lower sample feeding hole is fixed with a sample feeding sensor sheet, and the circle surrounded by the three sample feeding sensor sheets is concentric with the sample feeding chassis. When the sample feeding motor drives the sample feeding storage mechanism to rotate, the sample feeding photoelectric switch can sense each sample feeding sensor sheet in turn, and when the sample feeding photoelectric switch detects one of the sample feeding sensor sheets, the sample feeding motor is controlled to stop. At this time, the culture dish at the bottom layer located in the sample feeding positioning component can fall through the lower sample feeding hole and be pushed by the driving mechanism, and the other two lower sample feeding holes are blocked by the platform base.

[0009] Preferably, the driving mechanism includes a linear motor, a push block and a contact switch, the contact switch is installed on the platform base, the linear motor is located on one side of the platform base, the push block is located at the upper end of the platform base, and the output shaft of the linear motor is connected to one side of the push block, and the other side of the push block is used to push the culture dish to be sampled at the bottom layer to the operating position of the platform base, and when the push block moves to below the sample positioning member, it can block the lower sample hole. After the linear motor pushes the culture dish into place, the push block contacts and acts on the contact switch, and the contact switch controls the reversal of the linear motor and drives the push block back to its position and pushes the push block next time.

[0010] Preferably, the sample return storage mechanism includes a sample return top cover, a sample return base and a sample return positioning member, the sample return top cover and the sample return base are arranged up and down and in parallel, the sample return positioning member is installed between the sample return top cover and the sample return base, the sample return positioning member is used to place multiple culture dishes that have been sampled, the culture dishes in the sample return positioning member are stacked up and down, and an upper sample return hole is opened on the sample return top cover at a position corresponding to the sample return positioning member, the upper sample return hole can allow the culture dish to pass through, and the sample return culture dish that has been sampled is placed into the sample return positioning member through the upper sample return hole by the grasping mechanism.

[0011] Preferably, there are three groups of sample withdrawal positioning members, there are three upper sample withdrawal holes, and one sample withdrawal positioning member corresponds to one upper sample withdrawal hole, and a lower sample withdrawal hole is also provided on the sample withdrawal chassis at a position corresponding to each upper sample withdrawal hole; each of the sample withdrawal positioning members includes three sample withdrawal positioning rods, and the three sample withdrawal positioning rods are evenly fixed on the periphery of the upper sample withdrawal hole, and the culture dish is placed between the three sample withdrawal positioning rods.

[0012] Preferably, the automatic sample feeding and withdrawing device for a culture dish provided by the present invention further includes a sample withdrawing base, a sample withdrawing photoelectric switch and a sample withdrawing motor, the sample withdrawing base is installed below the sample withdrawing chassis and is parallel to the sample withdrawing chassis, the sample withdrawing motor is installed on the sample withdrawing base, and the output shaft of the sample withdrawing motor passes through the sample withdrawing base and is connected to the middle of the sample withdrawing chassis, the sample withdrawing photoelectric switch is installed on the sample withdrawing base through a bracket, and a sample withdrawing sensor piece is fixed at the lower end of the outer edge of each of the lower sample withdrawing holes, and the circle surrounded by the three sample withdrawing sensor pieces is concentric with the sample withdrawing chassis. When the sample withdrawing motor drives the sample withdrawing storage mechanism to rotate, the sample withdrawing photoelectric switch can sense each of the sample withdrawing sensor pieces in turn, and when the sample withdrawing photoelectric switch detects one of the sample withdrawing sensor pieces, the sample withdrawing motor is controlled to stop, and at this time, the grasping mechanism can grasp the sampled culture dish into the sample withdrawing positioning piece.

[0013] Preferably, the automatic sample feeding and withdrawing device for a culture dish provided by the present invention also includes a tray, an optical axis, a screw rod and a limit motor, the limit motor is installed at the lower end of the sample withdrawal base, and the output shaft of the limit motor is connected to the lower end of the screw rod, the upper end of the screw rod extends upward, the lower end of the optical axis is installed on the sample withdrawal base, the upper end of the optical axis extends upward, and the optical axis is arranged parallel to the screw rod, the tray passes through the optical axis and the screw rod, and one end of the tray can be extended into the sample withdrawal positioning member and used to support the culture dish, the outer periphery of the screw rod is provided with a slider, the outer periphery of the slider is connected to the tray, the limit motor can drive the screw rod to rotate and make the tray move back and forth along the axial direction of the screw rod.

[0014] Preferably, the grasping mechanism includes a robotic arm and a robotic claw, the robotic claw is connected to one end of the robotic arm, and the robotic arm is used to drive the robotic claw to grasp the sampled culture dish and place the culture dish onto the tray through the top of the tray.

[0015] Compared with the prior art, the present invention has achieved the following technical effects:

[0016] The automatic sampling and retrieval device for culture dishes provided by the present invention has a sampling and storage mechanism for placing multiple groups of culture dishes to be sampled, thereby facilitating continuous sampling; a driving mechanism is used to sequentially deliver the culture dishes to be sampled in the sampling and storage mechanism to the operating position of the platform base, so as to facilitate the picking of colonies and direct coating of target plates on the culture dishes at the operating position; at the same time, automatic sampling is achieved through the cooperation of the driving mechanism and the sampling and storage mechanism, thereby improving the sampling efficiency; a grasping mechanism is used to sequentially grasp the culture dishes on the platform base after sampling is completed and transfer them to the sample retrieval and storage mechanism; the sample retrieval and storage mechanism is used to place multiple groups of culture dishes after sampling, thereby facilitating continuous automatic grasping and improving the sample retrieval efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic structural diagram of the automatic sample feeding and withdrawing device for a culture dish provided by the present invention;

[0019] Figure 2 It is a structural diagram of the sample introduction mechanism and the platform base in the present invention;

[0020] Figure 3 yes Figure 2 A top view of

[0021] Figure 4 It is a structural diagram of the platform base in the present invention;

[0022] Figure 5 yes Figure 4 A top view of

[0023] Figure 6 It is a structural diagram of the cooperation between the sample-returning mechanism and the grasping mechanism in the present invention;

[0024] Figure 7 It is a top view of the cooperation between the sample-returning mechanism and the gripping mechanism in the present invention;

[0025] Figure 8 It is a structural schematic diagram of the tray in the present invention;

[0026] In the figure: 100-automatic sample feeding and withdrawing device for culture dishes, 1-sample feeding storage mechanism, 11-sample feeding top cover, 12-sample feeding positioning rod, 13-sample feeding chassis, 2-platform base, 21-culture platform, 3-sample withdrawal storage mechanism, 31-sample withdrawal top cover, 32-sample withdrawal positioning rod, 33-sample withdrawal chassis, 34-sample withdrawal base, 35-sample withdrawal photoelectric switch, 36-sample withdrawal sensor sheet, 37-sample withdrawal motor, 4-grabbing mechanism, 41-mechanical arm, 42-mechanical claw, 5-driving mechanism, 51-linear motor, 52-push block, 53-sample feeding photoelectric switch, 54-contact switch, 55-sample feeding sensor sheet, 56-sample feeding motor, 6-culture dish, 71-tray, 72-limit motor, 73-screw rod, 74-optical axis. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] The purpose of the present invention is to provide an automatic sample feeding and withdrawing device for a culture dish, so as to solve the technical problem that the existing sample feeding and withdrawing of the culture dish cannot be automatically operated, thereby affecting the efficiency.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figures 1-8 As shown, the present invention provides an automatic sampling and withdrawing device 100 for culture dishes, comprising a sampling and storage mechanism 1, a driving mechanism 5, a sample withdrawal and storage mechanism 3, a gripping mechanism 4 and a platform base 2. The sampling and storage mechanism 1 is used to place multiple groups of culture dishes 6 to be sampled, thereby facilitating continuous sampling. The driving mechanism 5 is used to sequentially deliver the culture dishes 6 to be sampled in the sampling and storage mechanism 1 to the operating position of the platform base 2, so as to facilitate the picking of colonies and direct coating of target plates on the culture dishes 6 at the operating position. At the same time, automatic sampling is achieved through the cooperation of the driving mechanism 5 and the sampling and storage mechanism 1, thereby improving the sampling efficiency. The gripping mechanism 4 is used to sequentially grab the culture dishes 6 on the platform base 2 that have completed sampling and transfer them to the sample withdrawal and storage mechanism 3. The sample withdrawal and storage mechanism 3 is used to place multiple groups of culture dishes 6 that have completed sampling, thereby facilitating continuous automatic gripping and improving the sample withdrawal efficiency.

[0031] Specifically, the sampling storage mechanism 1 includes a sampling top cover 11, a sampling bottom plate 13 and a sampling positioning member. The sampling top cover 11 and the sampling bottom plate 13 are arranged in parallel up and down to form a storage space for the culture dish 6. The sampling positioning member is installed between the sampling top cover 11 and the sampling bottom plate 13, and the sampling positioning member is used to place multiple culture dishes 6 to be sampled for continuous sampling. The culture dishes 6 in the sampling positioning member are stacked up and down, and a lower sampling hole is opened on the sampling bottom plate 13 at a position corresponding to the sampling positioning member. The lower sampling hole can allow the culture dish 6 to pass through. The driving mechanism 5 pushes the culture dish 6 that falls through the lower sampling hole to the operating position of the platform base 2, so that the culture dish 6 can be automatically The culture dishes 6 on the bottom layer automatically fall down under the action of body gravity, and then the driving mechanism 5 pushes the culture dish 6 on the bottom layer to the operation position to realize automatic sampling. That is, during the sampling process, the culture dish 6 on the bottom layer falls onto the platform base 2, and the driving mechanism 5 pushes the culture dish 6 to move to the culture platform 21. At this time, the culture dish 6 on the second-to-last layer contacts the upper end surface of the driving mechanism 5. When the driving mechanism 5 retracts and no longer limits the culture dishes 6 on the second-to-last layer, the culture dishes 6 on the second-to-last layer fall together with the culture dishes 6 above it, and the culture dishes 6 on the second-to-last layer fall onto the platform base 2, so that they can move under the push of the driving mechanism 5. This cycle realizes automatic sampling with high efficiency.

[0032] There are three groups of injection positioning members, three lower injection holes, and one group of injection positioning members corresponds to one lower injection hole. Upper injection holes are also provided on the injection top cover 11 at positions corresponding to the lower injection holes. The upper injection holes are used to place the culture dishes 6 into the injection positioning members to facilitate the injection of the culture dishes 6. Each injection positioning member includes three injection positioning rods 12, which are evenly fixed on the outer periphery of the lower injection hole, and the three injection positioning rods 12 are used to place the culture dishes 6. The culture dishes 6 are limited by the principle of three-point circle positioning. In the initial state, there are 32 culture dishes 6 in each group of injection positioning members. However, in the automatic injection and withdrawal device 100 for culture dishes provided by the present invention, the number of injection positioning members and the number of culture dishes 6 in each group of injection positioning members in the initial state are not limited to the above-mentioned limitations. Those skilled in the art can make adaptive adjustments according to actual needs.

[0033] The automatic sample feeding and withdrawing device 100 for a culture dish provided by the present invention further includes a sample feeding motor 56 and a sample feeding photoelectric switch 53. The sample feeding motor 56 is located at the lower end of the sample feeding chassis 13, and the sample feeding motor 56 is used to drive the sample feeding storage mechanism 1 to rotate, thereby realizing the switching of each sample feeding positioning member, so that each sample feeding positioning member is aligned with the driving mechanism 5 in sequence, that is, when the sample feeding of the culture dish 6 in a sample feeding positioning member is completed, the sample feeding storage mechanism 1 is driven to rotate by the sample feeding motor 56, so that the next sample feeding positioning member is aligned with the driving mechanism 5 and the sample feeding of the culture dish 6 is realized. The sample feeding photoelectric switch 53 is installed on the platform base 2, and the outer surface of each lower sample feeding hole is The edge of the sample feeding sensor sheet 55 is fixed, and the circle surrounded by the three sample feeding sensor sheets 55 is concentric with the sample feeding chassis 13. When the sample feeding motor 56 drives the sample feeding storage mechanism 1 to rotate, the sample feeding photoelectric switch 53 can sense each sample feeding sensor sheet 55 in turn, and when the sample feeding photoelectric switch 53 detects one of the sample feeding sensor sheets 55, the sample feeding motor 56 is controlled to stop. At this time, the bottommost culture dish 6 in the sample feeding positioning piece corresponding to the sample feeding sensor sheet 55 can fall through the lower sample feeding hole and be pushed by the driving mechanism 5. The other two lower sample feeding holes are blocked by the platform base 2 to prevent the culture dishes 6 in the other two sample feeding storage mechanisms 1 from falling.

[0034] The driving mechanism 5 includes a linear motor 51, a push block 52 and a contact switch 54. The contact switch 54 is installed on the platform base 2. The linear motor 51 is located on one side of the platform base 2, and the push block 52 is located at the upper end of the platform base 2. The output shaft of the linear motor 51 is connected to one side of the push block 52. The other side of the push block 52 is used to push the culture dish 6 to be sampled at the bottom layer to the operation position of the platform base 2. When the push block 52 moves to below the sampling positioning member, it can block the lower sampling hole, thereby preventing the second-to-last culture dish 6 from falling when the culture dish 6 to be sampled at the bottom layer is pushed. After the linear motor 51 pushes the culture dish 6 to move into place, the push block 52 contacts and acts on the contact switch 54. The contact switch 54 controls the linear motor 51 to reverse and drive the push block 52 to return. At the same time, after the push block 52 returns, it no longer blocks the lower sampling hole, and the second-to-last culture dish 6 falls, so as to facilitate the sampling of the second-to-last culture dish 6.

[0035] The sample return storage mechanism 3 includes a sample return top cover 31, a sample return base 33 and a sample return positioning member. The sample return top cover 31 and the sample return base 33 are arranged up and down and in parallel. The sample return positioning member is installed between the sample return top cover 31 and the sample return base 33. The sample return positioning member is used to place multiple sampled culture dishes 6, which facilitates the collection of multiple culture dishes 6 after sample return. The culture dishes 6 in the sample return positioning member are stacked up and down, and an upper sample return hole is opened on the sample return top cover 31 at a position corresponding to the sample return positioning member. The upper sample return hole can allow the culture dish 6 to pass through. The sampled culture dish 6 is placed into the sample return positioning member through the upper sample return hole by the grasping mechanism 4, and then the culture dishes 6 in the sample return positioning member are stacked.

[0036] There are three groups of sample withdrawal positioning members, three upper sample withdrawal holes, and one sample withdrawal positioning member corresponds to one upper sample withdrawal hole. Lower sample withdrawal holes are also provided on the sample withdrawal chassis 33 at positions corresponding to each upper sample withdrawal hole. Each sample withdrawal positioning member includes three sample withdrawal positioning rods 32, which are evenly fixed to the outer periphery of the upper sample withdrawal hole. Culture dishes 6 are placed between the three sample withdrawal positioning rods 32. The position of the culture dishes 6 is limited by the principle of three-point circle determination. Each group of sample withdrawal positioning members can accommodate 32 culture dishes 6. However, in the culture dish automatic sample feeding and withdrawing device 100 provided by the present invention, the number of sample withdrawal positioning members and the maximum number of culture dishes 6 that can be accommodated in each group of sample withdrawal positioning members are not limited to the above-mentioned limitations. Those skilled in the art can make adaptive adjustments according to actual needs.

[0037] The automatic sample feeding and withdrawing device 100 for culture dishes provided by the present invention also includes a sample withdrawing base 34, a sample withdrawing photoelectric switch 35 and a sample withdrawing motor 37. The sample withdrawing base 34 is installed below the sample withdrawing chassis 33 and is parallel to the sample withdrawing chassis 33. The sample withdrawing motor 37 is installed on the sample withdrawing base 34, and the output shaft of the sample withdrawing motor 37 passes through the sample withdrawing base 34 and is connected to the middle part of the sample withdrawing chassis 33, thereby being able to drive the sample withdrawing chassis 33 to rotate, so as to realize the switching of each sample withdrawing positioning member, so that each sample withdrawing positioning member is aligned with the grasping mechanism 4 in turn, that is, when the maximum number of culture dishes 6 in a sample withdrawing positioning member is reached, the sample withdrawing motor 37 drives the sample pushing and storing mechanism to rotate, so that the next sample withdrawing positioning member is aligned with the grasping mechanism 4 and the culture dishes 6 are fed and withdrawn. The sample withdrawal photoelectric switch 35 is mounted on the sample withdrawal base 34 through a bracket, that is, the lower end of the bracket is mounted on the sample withdrawal base 34, the upper end of the bracket and the sample withdrawal photoelectric switch 35, and the lower end of the outer edge of each lower sample withdrawal hole is fixed with a sample withdrawal sensor 36, and the circle surrounded by the three sample withdrawal sensor pieces 36 is concentric with the sample withdrawal chassis 33. When the sample withdrawal motor 37 drives the sample withdrawal storage mechanism 3 to rotate, the sample withdrawal photoelectric switch 35 can sense each sample withdrawal sensor piece 36 in turn, and when the sample withdrawal photoelectric switch 35 detects one of the sample withdrawal sensor pieces 36, the sample withdrawal motor 37 is controlled to stop. At this time, the grasping mechanism 4 can grasp the sampled culture dish 6 into the sample withdrawal positioning piece corresponding to the sample withdrawal sensor piece 36.

[0038] The cam 73 is connected to the upper and lower ends of the support frame 34 so as to prevent the cam 73 from sliding off and thus causing the support frame 34 to slide in and out of the support frame 34. The lifting mechanism 71 is moved up and down, and the lifting mechanism 71 is moved down ...

[0039] The grabbing mechanism 4 includes a robotic arm 41 and a robotic claw 42 . The robotic claw 42 is connected to one end of the robotic arm 41 . The robotic arm 41 is used to drive the robotic claw 42 to grab the sampled culture dish 6 and place the culture dish 6 onto the tray 71 from above.

[0040] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An automatic sample feeding and withdrawing device for a culture dish, characterized by: The sample feeding and storage mechanism comprises a sample feeding and storage mechanism, a driving mechanism, a sample returning and storage mechanism, a gripping mechanism and a platform base. The sample feeding and storage mechanism is used to place multiple groups of culture dishes to be sampled. The driving mechanism is used to sequentially deliver the culture dishes to be sampled in the sample feeding and storage mechanism to the operation position of the platform base. The gripping mechanism is used to sequentially grab the culture dishes on the platform base that have completed sampling and transfer them to the sample returning and storage mechanism. The sample returning and storage mechanism is used to place multiple groups of culture dishes that have completed sampling. The sample storage mechanism includes a sample top cover, a sample base and a sample positioning member, wherein the sample top cover and the sample base are arranged vertically and in parallel, and the sample positioning member is installed between the sample top cover and the sample base, and the sample positioning member is used to place a plurality of culture dishes to be sampled, and the culture dishes in the sample positioning member are stacked up and down, and a lower sample hole is opened on the sample base at a position corresponding to the sample positioning member, and the lower sample hole can allow the culture dish to pass through, and the culture dish falling through the lower sample hole is pushed to the operation position of the platform base by the driving mechanism; There are three groups of injection positioning members, and there are three lower injection holes, and each group of injection positioning members corresponds to one lower injection hole. An upper injection hole is also opened on the injection top cover at a position corresponding to each lower injection hole, and the upper injection hole is used to place the culture dish into the injection positioning member; each injection positioning member includes three injection positioning rods, and the three injection positioning rods are evenly fixed on the outer periphery of the lower injection hole, and the culture dish is placed between the three injection positioning rods; The sample feeding mechanism further comprises a sample feeding motor and a sample feeding photoelectric switch, wherein the sample feeding motor is located at the lower end of the sample feeding chassis, and the sample feeding motor is used to drive the sample feeding storage mechanism to rotate, the sample feeding photoelectric switch is installed on the platform base, and a sample feeding sensor is fixed to the outer edge of each lower sample feeding hole, and the circle surrounded by the three sample feeding sensor pieces is concentric with the sample feeding chassis. When the sample feeding motor drives the sample feeding storage mechanism to rotate, the sample feeding photoelectric switch can sense each sample feeding sensor piece in turn, and when the sample feeding photoelectric switch detects one of the sample feeding sensor pieces, the sample feeding motor is controlled to stop rotating, and at this time, the culture dish at the bottom layer in the sample feeding positioning member can fall through the lower sample feeding hole and be pushed by the driving mechanism, and the other two lower sample feeding holes are blocked by the platform base; The driving mechanism includes a linear motor, a push block and a contact switch, the contact switch is installed on the platform base, the linear motor is located on one side of the platform base, the push block is located at the upper end of the platform base, and the output shaft of the linear motor is connected to one side of the push block, and the other side of the push block is used to push the culture dish to be sampled at the bottom layer to the operating position of the platform base, and when the push block moves to below the sampling positioning member, it can block the lower sampling hole. After the linear motor pushes the culture dish into place, the push block contacts and acts on the contact switch, and the contact switch controls the reversal of the linear motor and drives the push block to return to its position and push the push block next time.

2. The automatic sample feeding and withdrawing device for a culture dish according to claim 1, characterized in that: The sample return storage mechanism includes a sample return top cover, a sample return bottom tray and a sample return positioning member. The sample return top cover and the sample return bottom tray are arranged vertically and in parallel. The sample return positioning member is installed between the sample return top cover and the sample return bottom tray. The sample return positioning member is used to place a plurality of culture dishes after sampling. The culture dishes in the sample return positioning member are stacked up and down, and an upper sample return hole is opened on the sample return top cover at a position corresponding to the sample return positioning member. The upper sample return hole can allow the culture dish to pass through. The sample return dish after sampling is placed into the sample return positioning member through the upper sample return hole by the grasping mechanism.

3. The automatic sample feeding and withdrawing device for a culture dish according to claim 2, characterized in that: There are three groups of sample withdrawal positioning members, three upper sample withdrawal holes, and one sample withdrawal positioning member corresponds to one upper sample withdrawal hole. A lower sample withdrawal hole is also provided on the sample withdrawal chassis at a position corresponding to each upper sample withdrawal hole. Each sample withdrawal positioning member includes three sample withdrawal positioning rods, which are evenly fixed on the outer periphery of the upper sample withdrawal hole, and the culture dish is placed between the three sample withdrawal positioning rods.

4. The automatic sample feeding and withdrawing device for a culture dish according to claim 3, characterized in that: The cam is connected to the upper portion of the sample discharging plate to move the sample discharging motor to the upper portion of the sample discharging plate, and the cam is connected to the lower portion of the sample discharging plate to move the sample discharging motor to the lower portion of the sample discharging plate.

5. The automatic sample feeding and withdrawing device for a culture dish according to claim 4, characterized in that: The cam is connected to the lower end of the sample ejection base by a movable frame, and the movable frame is connected to the upper end of the sample ejection base by a movable frame. The cam is connected to the lower end of the sample ejection base by a movable frame. The movable frame is connected to the lower end of the sample ejection base by a movable frame.

6. The automatic sample feeding and withdrawing device for a culture dish according to claim 5, characterized in that: The grabbing mechanism includes a robotic arm and a robotic claw, the robotic claw is connected to one end of the robotic arm, and the robotic arm is used to drive the robotic claw to grab the culture dish after sampling, and place the culture dish onto the tray through the top of the tray.

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