Sampling device for flow cytometer

Abstract

The invention relates to the technical field of flow cytometers, and discloses a sampling device for a flow cytometer, which comprises a working table, a circular notch is arranged above the working table, the flow cytometer is arranged above the working table, a circular rotating plate is arranged between the flow cytometer and the working table, and the circular rotating plate is arranged above the working table. Four notches distributed circumferentially are further formed in the circular rotating plate, circular mounting cylinders are arranged in inner cavities of the notches, and supporting frames are arranged on the periphery of the bottom of the workbench; and a placing cylinder is arranged in an inner cavity of each circular mounting cylinder. According to the invention, the driving assembly drives the circular rotating plate to rotate, so that the semicircular mounting ring assists the placement cylinder to automatically lift, and the outer semicircular mounting ring and the inner semicircular mounting ring are matched to realize automatic clamping and loosening of the test tube body, so that shaking during detection is avoided, and the detection precision is guaranteed; therefore, the test tube body can be automatically sampled and fed under the assistance of the driving assembly, so that the operation is convenient, and the test tube can be quickly taken out after detection.

Description

Technical Field

[0001] This invention belongs to the field of flow cytometry technology, and more specifically, relates to a sampling device for flow cytometry. Background Technology

[0002] In the flow cytometer detection process, the sampling device is the core component for sample transport, and its operational stability and automated coordination directly affect the accuracy of detection data and process efficiency.

[0003] Currently, cell testing typically involves placing sampled cells into test tubes, then placing the test tubes into a flow cytometer for alignment and analysis. However, flow cytometry often requires multiple assays, and placing a single test tube into the flow cytometer each time is cumbersome. Furthermore, since the test tubes are placed inside the flow cytometer's cavity, removing them from the flow cytometer is also quite inconvenient.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: A sampling device for a flow cytometer includes a worktable with a circular slot on its top. A flow cytometer is mounted on the worktable, and a circular rotating plate is positioned between the flow cytometer and the worktable. The rotating plate has four circumferentially distributed slots, each containing a circular mounting cylinder. Support frames are provided around the bottom of the worktable. Each circular mounting cylinder contains a placement cylinder for holding a test tube. A semi-circular mounting ring is located at the bottom of the circular slot. The rotating plate has an outer and an inner semi-circular mounting ring. A laser detection component is located within the flow cytometer. A driving assembly is located at the bottom of the worktable to drive the rotating plate to rotate. This rotation, aided by the semi-circular mounting rings, drives the placed test tubes to rise and fall. The rotation also helps to clamp and loosen the placed test tubes with the assistance of the outer and inner semi-circular mounting rings.

[0006] In a preferred embodiment of the present invention, two motorized slide rails are provided on the front side of the flow cytometer. The two motorized slide rails are symmetrical to each other, and a sealing door is slidably provided on the two motorized slide rails. The sealing door is used to seal the flow cytometer.

[0007] In a preferred embodiment of the present invention, the driving component includes a servo motor, which is disposed at the bottom of the worktable. A rotating rod is disposed at the output end of the servo motor, and a circular rotating plate is disposed at the end of the rotating rod away from the servo motor. The circular rotating plate is rotatably disposed on the inner wall of a circular slot.

[0008] In a preferred embodiment of the present invention, each of the circular mounting cylinders has two movable grooves in its inner cavity, each movable groove being symmetrical to the other, and each movable groove having a movable slider slidably disposed thereon, each movable slider being symmetrical to the other, and each movable slider being connected to the placement cylinder in pairs.

[0009] In a preferred embodiment of the present invention, each of the placement cylinders is provided with a connecting rod at the bottom, and each of the connecting rods is rotatably provided with a sliding ball.

[0010] In a preferred embodiment of the present invention, two arc-shaped inclined surfaces are provided above the semi-circular mounting ring, and an upper sliding surface is provided between each pair of the two arc-shaped inclined surfaces. The upper sliding surface is integrated with the arc-shaped inclined surface and the semi-circular mounting ring, and a sliding ball is slidably provided above it.

[0011] In a preferred embodiment of the present invention, the outer semicircular mounting ring has two outwardly inclined surfaces at both ends, the two outwardly inclined surfaces are symmetrical to each other, and an outer semicircular placement ring is provided at the end of each of the two outwardly inclined surfaces away from the outer semicircular mounting ring. The outer semicircular mounting ring is integrally formed with the two outwardly inclined surfaces and the outer semicircular placement ring, and an outer sliding rod is slidably provided on the inner wall.

[0012] In a preferred embodiment of the present invention, the inner semicircular mounting ring has two inner inclined surfaces at both ends, the two inner inclined surfaces are symmetrical to each other, and an inner semicircular placement ring is provided at the end of each of the two inner inclined surfaces away from the inner semicircular mounting ring. The inner semicircular mounting ring is integrally formed with the two inner inclined surfaces and the inner semicircular placement ring, and an inner sliding rod is slidably provided on the inner wall.

[0013] In a preferred embodiment of the present invention, the circular mounting cylinder and the placement cylinder are respectively provided with two outer mounting slots and two inner mounting slots, and each of the outer mounting slots and the inner mounting slots are symmetrical to each other and fit together.

[0014] In a preferred embodiment of the present invention, each of the placement cylinders has an outer clamping plate and an inner clamping plate placed inside its cavity, and the outer clamping plate and the inner clamping plate are symmetrical to each other. An outer sliding rod and an inner sliding rod are respectively provided at opposite ends of each of the outer clamping plate and the inner clamping plate.

[0015] Compared with the prior art, the present invention has the following advantages: This invention uses a drive component to rotate a circular rotating plate, thereby allowing the semi-circular mounting ring to automatically lift and lower the placement cylinder. The outer and inner semi-circular mounting rings work together to automatically clamp and loosen the test tube body, preventing shaking during testing and ensuring testing accuracy. Therefore, with the assistance of the drive component, automatic sampling and feeding of the test tube body can be achieved, making the operation convenient and allowing the test tube to be quickly removed after testing.

[0016] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0017] In the attached diagram: Figure 1 This is a three-dimensional structural diagram of a sampling device for flow cytometer. Figure 2 This is a bottom view schematic diagram of a sampling device for flow cytometer; Figure 3 This is a schematic diagram of the structure above the worktable of a sampling device for a flow cytometer. Figure 4 This is an enlarged schematic diagram of the circumferential rotating plate of a sampling device for a flow cytometer. Figure 5 A bottom view of the rotating plate structure of a sampling device for a flow cytometer; Figure 6 This is an exploded view of the circumferential rotating plate and semi-circular mounting ring of a sampling device for a flow cytometer. Figure 7 A sampling device for flow cytometer Figure 6 Enlarged structural diagram at point A in the middle; Figure 8 This is an exploded bottom view of the circumferential rotating plate and semi-circular mounting ring of a sampling device for a flow cytometer.

[0018] In the picture: 1. Support frame; 11. Workbench; 12. Flow cytometer; 121. Sealed door; 122. Electric slide rail; 13. Circular slot; 14. Test tube body; 15. Laser detection assembly; 2. Servo motor; 21. Rotating rod; 211. Circular rotating plate; 22. Circular mounting cylinder; 221. Moving slide; 222. Moving slider; 223. Outer mounting slot; 23. Placement cylinder; 231. Inner mounting slot; 232. Connecting rod; 233. Sliding ball; 24. Semi-circular mounting ring; 241. Arc-shaped inclined surface; 242. Upper sliding surface; 3. Outer semicircular mounting ring; 31. Outer inclined surface; 311. Outer semicircular placement ring; 312. Outer sliding rod; 313. Outer clamping plate; 32. Inner semicircular mounting ring; 321. Inner inclined surface; 322. Inner semicircular placement ring; 323. Inner sliding rod; 324. Inner clamping plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention.

[0020] Example 1: like Figures 1 to 8 As shown, a sampling device for a flow cytometer includes a workbench 11 with a circular slot 13 on top. A flow cytometer 12 is also mounted above the workbench 11. A circular rotating plate 211 is positioned between the flow cytometer 12 and the workbench 11. The rotating plate 211 has four circumferentially distributed slots, and circular mounting cylinders 22 are installed inside the slots. Support frames 1 are provided around the bottom of the workbench 11. Each circular mounting cylinder 22 has a placement cylinder 23 inside its cavity, and each placement cylinder 23 is used to place a test tube body 14. A semi-circular mounting ring 24 is provided at the bottom of the inner cavity of the slot 13. An outer semi-circular mounting ring 3 and an inner semi-circular mounting ring 32 are provided on the circular rotating plate 211. A laser detection component 15 is provided in the inner cavity of the flow cytometer 12. A drive component is provided at the bottom of the worktable 11. The drive component is used to drive the circular rotating plate 211 to rotate. The rotation of the circular rotating plate 211 is used to drive the placed test tube body 14 to rise and fall with the assistance of the semi-circular mounting ring 24. The rotation of the circular rotating plate 211 is also used to clamp and loosen the placed test tube body 14 with the assistance of the outer semi-circular mounting ring 3 and the inner semi-circular mounting ring 32. The drive component drives the circular rotating plate 211 to rotate, thereby allowing the semi-circular mounting ring 24 to automatically lift and lower the auxiliary placement cylinder 23. The outer semi-circular mounting ring 3 and the inner semi-circular mounting ring 32 work together to automatically clamp and loosen the test tube body 14, avoiding shaking during testing and ensuring testing accuracy. Therefore, with the assistance of the drive component, automatic sampling and feeding of the test tube body 14 can be achieved, making the operation convenient and allowing the test tube to be quickly removed after testing.

[0021] like Figures 1 to 2As shown in the specific embodiment, two motorized slide rails 122 are also provided on the front side of the flow cytometer 12. The two motorized slide rails 122 are symmetrical to each other, and sealing doors 121 are slidably mounted on the two motorized slide rails 122. The sealing doors 121 are used to seal the flow cytometer 12. In this configuration, the motorized slide rails 122 can drive the sealing doors 121 to slide up and down vertically. When open, they provide a channel for the test tube body 14 to enter the detection area of ​​the flow cytometer 12. When closed, they can seal the inner cavity of the flow cytometer 12, preventing external environmental interference with the detection process and ensuring the sealing and stability of the detection environment.

[0022] Example 2: The difference between the above embodiments and this embodiment is that: Figures 1 to 6 and Figure 8 As shown, a sampling device for a flow cytometer includes a drive assembly comprising a servo motor 2, which is mounted at the bottom of a worktable 11. A rotating rod 21 is mounted at the output end of the servo motor 2, and a circular rotating plate 211 is mounted at the end of the rotating rod 21 furthest from the servo motor 2. The circular rotating plate 211 is rotatably mounted on the inner wall of a circular slot 13. The installation position and components of the drive assembly are thus determined.

[0023] like Figures 1 to 8 As shown in the specific embodiment, each circular mounting cylinder 22 has two movable grooves 221 inside its cavity. Each movable groove 221 is symmetrical to the others. Each movable groove 221 has a movable slider 222 slidably mounted inside its cavity. Each movable slider 222 is also symmetrical to the others, and each movable slider 222 is connected to the placement cylinder 23 in pairs. In this configuration, the movable sliders 222 and the movable grooves 221 constitute a sliding guide mechanism, limiting the placement cylinder 23 to move only up and down along the axial direction of the circular mounting cylinder 22. This prevents the placement cylinder 23 from shifting or wobbling during circumferential rotation, providing structural support for the smooth lifting and lowering of the placement cylinder 23.

[0024] like Figures 1 to 8 As shown, each placement cylinder 23 is further provided with a connecting rod 232 at its bottom, and a sliding ball bearing 233 is rotatably mounted at the bottom of each connecting rod 232. In this configuration, the contact surface between the sliding ball bearing 233 and the semi-circular mounting ring 24 is subject to rolling friction, which can significantly reduce the friction force when the placement cylinder 23 is raised or lowered, making the raising and lowering action of the placement cylinder 23 as it rotates with the circular rotating plate 211 smoother; the connecting rod 232 is used to connect the placement cylinder 23 and the sliding ball bearing 233, converting the rolling displacement of the sliding ball bearing 233 into the axial displacement of the placement cylinder 23.

[0025] like Figures 1 to 8As shown, further, two arc-shaped inclined surfaces 241 are provided above the semi-circular mounting ring 24, and an upper sliding surface 242 is provided between each pair of arc-shaped inclined surfaces 241. The upper sliding surface 242 is integrated with the arc-shaped inclined surfaces 241 and the semi-circular mounting ring 24, and a sliding ball 233 is slidably disposed above it. In this configuration, the two arc-shaped inclined surfaces 241 are symmetrically distributed, forming a low-high-low height transition structure, providing a sliding path for the sliding ball 233 from the initial high position to the detection position and then back to the initial high position.

[0026] Example 3: The difference between the above embodiments and this embodiment is that: Figures 1 to 7 As shown, a sampling device for a flow cytometer has two outwardly inclined surfaces 31 at both ends of an outer semicircular mounting ring 3. The two outwardly inclined surfaces 31 are symmetrical to each other. An outer semicircular placement ring 311 is provided at the end of each outwardly inclined surface 31 away from the outer semicircular mounting ring 3. The outer semicircular mounting ring 3 is integrally formed with the two outwardly inclined surfaces 31 and the outer semicircular placement ring 311, and an outer sliding rod 312 is slidably arranged on the inner wall. The outer semicircular mounting ring 3 provides an initial placement position for the outer sliding rod 312, so that the outer clamping plate 313 is initially in a loose state. The outwardly inclined surfaces 31 are inclined inwards. When the outer sliding rod 312 slides along them, the circular motion of the circular rotating plate 211 is converted into the centripetal linear motion of the outer sliding rod 312, providing clamping power for the outer clamping plate 313.

[0027] like Figures 1 to 7 As shown, in a specific embodiment, the inner semicircular mounting ring 32 has two inwardly inclined surfaces 321 at both ends, which are symmetrical. An inner semicircular placement ring 322 is provided at the end of each inwardly inclined surface 321 away from the inner semicircular mounting ring 32. The inner semicircular mounting ring 32 is integrally formed with the two inwardly inclined surfaces 321 and the inner semicircular placement ring 322, and an inner sliding rod 323 is slidably mounted on its inner wall. In this configuration, the inner semicircular placement ring 322 provides an initial placement position for the inner sliding rod 323, so that the inner clamping plate 324 is initially in a loose state. The inwardly inclined surface 321 is centripetally inclined; when the inner sliding rod 323 slides along it, the circular motion of the circular rotating plate 211 is converted into the centripetal linear motion of the inner sliding rod 323, providing clamping power for the inner clamping plate 324.

[0028] like Figures 1 to 7As shown, the circular mounting cylinder 22 and the placement cylinder 23 are further provided with two outer mounting slots 223 and two inner mounting slots 231, respectively. Each pair of outer mounting slots 223 and inner mounting slots 231 is symmetrical and fits into each other. In this configuration, the outer mounting slot 223 provides a sliding channel for the outer sliding rod 312 to pass through the circular mounting cylinder 22, and the inner mounting slot 231 provides a sliding channel for the inner sliding rod 323 to pass through the placement cylinder 23. The two fit into each other and are symmetrically distributed, ensuring that the moving direction of the outer sliding rod 312 and the inner sliding rod 323 is perpendicular to the axis of the placement cylinder 23, and ensuring that the clamping direction of the clamping plate is accurately pointed to the central axis of the test tube body 14.

[0029] like Figures 1 to 7 As shown, furthermore, each placement tube 23 has an outer clamping plate 313 and an inner clamping plate 324 placed inside its cavity, and the outer clamping plate 313 and the inner clamping plate 324 are symmetrical to each other. An outer sliding rod 312 and an inner sliding rod 323 are respectively provided on opposite ends of each outer clamping plate 313 and the inner clamping plate 324. In this configuration, both the outer clamping plate 313 and the inner clamping plate 324 are made of elastic material, and their opposite sides are provided with arc-shaped clamping surfaces, which have a higher degree of fit with the outer wall of the test tube body 14. Through the synchronous centripetal movement of the outer sliding rod 312 and the inner sliding rod 323, the two can form a symmetrical clamping of the test tube body 14 from both sides, which not only ensures the clamping stability, but also avoids damage to the test tube due to excessive clamping force, and allows for quick removal and placement of the test tube when it is loose.

[0030] The implementation principle of a sampling device for flow cytometer according to the present invention is as follows: The test tube body 14 to be tested is placed into the inner cavity of the four placement cylinders 23 respectively. At this time, the outer clamping plate 313 and the inner clamping plate 324 are in a loose state of separation. The test tube body 14 is stably placed in the placement cylinder 23 by its own weight. (Where the outer sliding rod 312 is correspondingly slidably set on the inner wall of the outer semi-circular placement ring 311, and the inner sliding rod 323 is correspondingly slidably set on the inner wall of the inner semi-circular placement ring 322, the moving slider 222 is at the uppermost position in the inner cavity of the moving slide groove 221, and the placement cylinder 23 is also at the highest position. The sealing door 121 of the flow cytometer 12 is in the open state under the support of the electric slide rail 122, reserving a channel for the test tube body 14 to enter the detection area later (wherein the operation of the electric slide rail 122 is the prior art). The drive assembly at the bottom of the workbench 11 is started, the servo motor 2 is powered on and drives the rotating rod 21 to rotate. The end of the rotating rod 21 away from the servo motor 2 is fixedly connected to the circular rotating plate 211, thereby driving the circular rotating plate 211 to rotate smoothly on the inner wall of the circular slot 13 of the workbench 11. The four circular mounting cylinders 22 set on the circular rotating plate 211 move in a circular motion with the circular rotating plate 211. The placement cylinder 23 slides with the moving groove 221 of the circular mounting cylinder 22 through the moving slider 222, and rotates synchronously with the circular mounting cylinder 22, realizing the circumferential transport of the test tube body 14. As the circular rotating plate 211 continues to rotate, the sliding ball 233 at the end of the connecting rod 232 at the bottom of the placement cylinder 23 gradually contacts and slides against the arc-shaped inclined surface 241 of the semi-circular mounting ring 24. Since the arc-shaped inclined surface 241 is inclined, when the sliding ball 233 rolls down along the arc-shaped inclined surface 241, it drives the placement cylinder 23 to move downward through the connecting rod 232. The moving slider 222 slides down along the inner cavity of the moving groove 221 until the sliding ball 233 slides to the upper surface of the semi-circular mounting ring 24. At this time, the placement cylinder 23 drives the test tube body 14 to move downward, so that the test tube body 14 can be located in the optimal position inside the placement cylinder 23, which is convenient for subsequent detection by the laser detection component 15 set in the flow cytometer 12. As the placement cylinder 23 moves downward, the rotation of the circular rotating plate 211 causes the outer sliding rod 312 to slide from the inner wall of the outer semicircular placement ring 311 into the outer inclined surface 31, and the inner sliding rod 323 to slide from the inner wall of the inner semicircular placement ring 322 into the inner inclined surface 321. The inclined structures of the outer inclined surface 31 and the inner inclined surface 321 respectively generate centripetal thrust on the outer sliding rod 312 and the inner sliding rod 323, pushing the outer sliding rod 312 along the outer mounting slot 223 into the inner cavity of the placement cylinder 23. The inner sliding rod 323 moves along the inner mounting slot 231 into the inner cavity of the placement cylinder 23; thus, the outer sliding rod 312 can drive the outer clamping plate 313 and the inner sliding rod 323 can drive the inner clamping plate 324 respectively, moving relative to each other. When the outer clamping plate 313 and the inner clamping plate 324 approach each other, the placed test tube body 14 can be tightly clamped, thereby achieving the clamping and fixing of the test tube body 14 and preventing the test tube body 14 from shaking during the testing process; After the circular rotating plate 211 rotates 90 degrees, the servo motors 2 are stopped in sequence, and the electric slide rail 122 is also controlled to move. The electric slide rail 122 drives the sealing door 121 to seal the flow cytometer 12, thereby ensuring that the previously placed test tube body 14 can be sealed in the detection area of ​​the flow cytometer 12, ensuring the stability of the detection environment. Subsequently, the laser detection component 15 in the inner cavity of the flow cytometer 12 is activated to perform flow cytometry detection and analysis on the sample in the test tube body 14. When the circular rotating plate 211 rotates 90 degrees, it drives the previously tested test tube body 14 to rotate in a circle, while simultaneously controlling the electric slide rail 122 to drive the sealing door 121 to open. As the circular rotating plate 211 continues to rotate, the outer sliding rod 312 slides from the outer inclined surface 31 back to the outer semicircular placement ring 311, and the inner sliding rod 323 slides from the inner inclined surface 321 back to the inner semicircular placement ring 322. The centripetal thrust disappears, thus releasing the clamping state of the test tube body 14. At the same time, the sliding ball 233 rolls upward from the upper sliding surface 242 along the arc-shaped inclined surface 241, thereby pushing the placement cylinder 23 to move upward with the assistance of the moving slide groove 221 and the moving slider 222 until it returns to the initial state. At this time, it is convenient for the staff to remove the tested test tube body 14. Therefore, this cycle is repeated to test multiple test tube bodies 14.

[0031] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sampling device for a flow cytometer, comprising a worktable (11), characterized in that: A circular slot (13) is provided above the workbench (11). A flow cytometer (12) is also provided above the workbench (11). A circular rotating plate (211) is provided between the flow cytometer (12) and the workbench (11). The circular rotating plate (211) is also provided with four slots arranged in a circular pattern, and a circular mounting cylinder (22) is provided in the inner cavity of the slot. A support frame (1) is provided around the bottom of the workbench (11). Each of the circular mounting cylinders (22) has a placement cylinder (23) inside its cavity. Each placement cylinder (23) has a cavity inside its cavity for placing a test tube body (14). A semi-circular mounting ring (24) is provided at the bottom of the cavity inside the circular slot (13). An outer semi-circular mounting ring (3) and an inner semi-circular mounting ring (32) are provided on the circular rotating plate (211). A laser detection component (15) is provided inside the cavity of the flow cytometer (12). The bottom of the workbench (11) is provided with a driving assembly, which is used to drive the circular rotating plate (211) to rotate. The rotation of the circular rotating plate (211) is used to drive the placed test tube body (14) to rise and fall with the assistance of the semi-circular mounting ring (24). The rotation of the circular rotating plate (211) is also used to clamp and loosen the placed test tube body (14) with the assistance of the outer semi-circular mounting ring (3) and the inner semi-circular mounting ring (32).

2. A sampling device for a flow cytometer according to claim 1, characterized in that, Two electric slide rails (122) are also provided on the front side of the flow cytometer (12). The two electric slide rails (122) are symmetrical to each other. A sealing door (121) is slidably provided on the two electric slide rails (122). The sealing door (121) is used to seal the flow cytometer (12).

3. A sampling device for a flow cytometer according to claim 1, characterized in that, The drive assembly includes a servo motor (2), which is located at the bottom of the workbench (11). A rotating rod (21) is provided at the output end of the servo motor (2). A circular rotating plate (211) is provided at the end of the rotating rod (21) away from the servo motor (2). The circular rotating plate (211) is rotatably located on the inner wall of the circular slot (13).

4. A sampling device for a flow cytometer according to claim 1, characterized in that, Each of the circular mounting cylinders (22) has two movable grooves (221) in its inner cavity. Each movable groove (221) is symmetrical to each other. Each movable groove (221) has a movable slider (222) slidably disposed in its inner cavity. Each movable slider (222) is symmetrical to each other. Each movable slider (222) is connected to the placement cylinder (23) in each other.

5. A sampling device for a flow cytometer according to claim 1, characterized in that, Each of the placement cylinders (23) is provided with a connecting rod (232) at the bottom, and each of the connecting rods (232) is provided with a sliding ball (233) at the bottom.

6. A sampling device for a flow cytometer according to claim 1, characterized in that, Two arc-shaped inclined surfaces (241) are provided above the semi-circular mounting ring (24). An upper sliding surface (242) is provided between each pair of the two arc-shaped inclined surfaces (241). The upper sliding surface (242) is integrated with the arc-shaped inclined surface (241) and the semi-circular mounting ring (24), and a sliding ball (233) is slidably provided above it.

7. A sampling device for a flow cytometer according to claim 1, characterized in that, The outer semicircular mounting ring (3) has two outward inclined surfaces (31) at both ends. The two outward inclined surfaces (31) are symmetrical to each other. An outer semicircular placement ring (311) is provided at one end of each outward inclined surface (31) away from the outer semicircular mounting ring (3). The outer semicircular mounting ring (3) is integrated with the two outward inclined surfaces (31) and the outer semicircular placement ring (311), and an outer sliding rod (312) is slidably provided on the inner wall.

8. A sampling device for a flow cytometer according to claim 6, characterized in that, The inner semicircular mounting ring (32) has two inner inclined surfaces (321) at both ends. The two inner inclined surfaces (321) are symmetrical to each other. The two inner inclined surfaces (321) are respectively provided with an inner semicircular placement ring (322) at the end away from the inner semicircular mounting ring (32). The inner semicircular mounting ring (32) is integrated with the two inner inclined surfaces (321) and the inner semicircular placement ring (322), and an inner sliding rod (323) is slidably provided on the inner wall.

9. A sampling device for a flow cytometer according to claim 1, characterized in that, The circular mounting cylinder (22) and the placement cylinder (23) are respectively provided with two outer mounting slots (223) and two inner mounting slots (231). Each of the outer mounting slots (223) and the inner mounting slots (231) are symmetrical to each other and fit together.

10. A sampling device for a flow cytometer according to claim 1, characterized in that, Each of the placement cylinders (23) has an outer clamping plate (313) and an inner clamping plate (324) placed inside its cavity. The outer clamping plate (313) and the inner clamping plate (324) are symmetrical to each other. An outer sliding rod (312) and an inner sliding rod (323) are respectively provided at opposite ends of each of the outer clamping plate (313) and the inner clamping plate (324).

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