A sampling device

Abstract

The present invention discloses a sampling device, which includes a sampling rack and a distribution valve, wherein the sampling rack is arranged above the distribution valve, the sampling rack is rotatably connected to an instrument, the sampling rack has multiple rotation angles for connecting to different sample input ends, the sampling rack is provided with a sampling needle, the sampling needle is connected to the processing chamber of the instrument, the distribution valve is provided with a liquid outlet and multiple liquid inlet channels connected to multiple different processing medium input ends, the distribution valve is used to switch the connection between the liquid outlet and any one of the liquid inlet channels, and in the initial state, the sampling needle is in a vertical state and is connected to the liquid outlet. By adopting the present invention, the sampling of multiple samples can be achieved through the same sampling rack, avoiding the sample remaining in the sampling needle and causing contamination of the next sample, the steps are simple, the operation is easy, and the accuracy of the detection is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of device cleaning, and in particular relates to a sampling device. Background Art

[0002] Blood gas electrolyte analyzers are instruments used to detect trace element content from samples. There are many types of samples. After the test is completed, the sampling device needs to be cleaned to prevent contamination of other test reagents, which will cause the test results to be invalid. The sampling needle of the existing technology can only move back and forth from the original position to the same sampling position. Sampling requires the operator to visually confirm that the sample is in place and click the screen before it can be executed. Moreover, it can only feed samples with syringes and ampules. If capillary feeding is required, other additional configurations are required, and the operation is cumbersome. In addition, when cleaning the sampling device, multiple closed cavities are required, which are prone to leakage, and the flow path is complex, installation and maintenance are difficult, there are many cleaning steps, and it takes a long time, which has a great impact on the detection of reagents. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a sampling device and a cleaning method, which can effectively solve the problems of the prior art such as cumbersome operation, complex flow path, multiple cleaning steps and long time consumption.

[0004] In order to solve the above technical problems, the present invention provides a sampling device, which includes a sampling rack and a distribution valve. The sampling rack is arranged above the distribution valve, and the sampling rack is rotatably connected to the instrument. The sampling rack has multiple rotation angles for connecting to different sample input ends. The sampling rack is provided with a sampling needle, and the sampling needle is connected to the processing chamber of the instrument. The distribution valve is provided with a liquid outlet and multiple liquid inlet channels connected to multiple different processing medium input ends. The distribution valve is used to switch the connection between the liquid outlet and any one of the liquid inlet channels. In the initial state, the sampling needle is in a vertical state, and the sampling needle is connected to the liquid outlet.

[0005] As a preferred embodiment of the present invention, the sampling rack includes a shell, a sampling assembly and a cam, the sampling assembly is arranged inside the shell, the sampling assembly includes a rotating shaft, a connecting frame, a slider, a compression spring, a push rod and the sampling needle, the shell is rotatably connected to the cam through the rotating shaft, the connecting frame is provided with a guide groove that slidably cooperates with the slider, the compression spring is arranged in the guide groove, one end of the push rod is fixed with the slider, the other end of the push rod is provided with a connecting head, the bottom end of the compression spring is abutted against the slider, the connecting head is provided with a avoidance hole, the rotating shaft is provided with a hollow channel, one end of the sampling needle is movably plugged into the avoidance hole, the other end of the sampling needle is connected to the hollow channel, the cam is provided with a through hole that cooperates with the hollow channel, the shell is provided with a fixed boss on a side facing the cam, the slider is provided with a movable boss on a side facing the cam, the shell is provided with a sliding groove for the movable boss to slide, the cam is provided with a first arc groove, a second arc groove, a first straight groove and a second straight groove, and the second arc groove, the first straight groove and the second straight groove are connected.

[0006] As a preferred solution of the present invention, a PCB board is provided on the side of the cam away from the shell, and Hall sensors are provided on the PCB board at positions corresponding to the first initial clamping position, the first intermediate clamping position, the first terminal clamping position, the first liquid pumping position and the second liquid pumping position, and magnets are provided on the fixed boss and the movable boss.

[0007] As a preferred embodiment of the present invention, the sampling assembly further includes a torsion spring and a torsion spring mounting seat, one end of the torsion spring mounting seat is rotatably connected to the rear cover, the other end of the torsion spring mounting seat is connected to the slider, the torsion spring is installed on the torsion spring mounting seat, one end of the torsion spring is connected to the torsion spring mounting seat, and the other end of the torsion spring is connected to the connecting frame.

[0008] As a preferred embodiment of the present invention, the distributing valve includes a stator assembly, a rotor assembly and a flow path plate with multiple microchannels built in. The stator assembly includes a stator housing, a flow path tube and a sealing gasket. The stator housing is fixed on the flow path plate, and the sealing gasket cover is provided on the stator housing. There are multiple flow path tubes, and the multiple flow path tubes are arranged in the stator housing and are arranged circumferentially. The lower ends of the multiple flow path tubes are respectively connected to the corresponding microchannels in the flow path plate. The sealing gasket includes an annular gasket and a cannula. The bottom surface of the annular gasket is against the upper end surface of the flow path tube. There are multiple cannulae, and the multiple cannulae are fixed on the The bottom of the annular gasket is arranged in a circular pattern, the cannula is plugged into the flow tube in a one-to-one correspondence, the annular gasket is provided with a first flow hole that is connected to the cannula in a one-to-one correspondence, each of the microchannels in the flow path plate is connected to a probe for inputting the processing medium, the probe, the microchannel, the flow tube, the cannula and the first flow hole are connected in sequence, the rotor assembly is rotatably connected to the top of the stator assembly, the rotor assembly is provided with a liquid inlet channel, the liquid outlet is connected to the liquid inlet channel, and when the rotor assembly rotates to a certain angle, the liquid outlet is connected to one of the first flow holes.

[0009] As a preferred embodiment of the present invention, the rotor assembly includes a rotor and a rotor fixing block, the rotor is rotatably connected to the top of the stator assembly, the flow path plate and the stator assembly are both provided with mounting holes for the rotor shaft to pass through, the rotor and the rotor fixing block are fixedly connected by screws, and the rotor fixing block serves as the rotor shaft and is rotatably connected to the bottom of the flow path plate.

[0010] As a preferred embodiment of the present invention, the rotor includes a flat plate and a gear, the top surface of the gear is provided with a first cavity, the center of the first cavity is provided with a conical boss, the liquid outlet is arranged on the conical boss, the bottom surface of the gear is provided with a second cavity, and the liquid inlet channel is formed by a solder seal between the flat plate and the second cavity.

[0011] As a preferred solution of the present invention, a plurality of residual liquid recovery ports are provided around the conical boss, a residual liquid recovery trough is provided on the flat plate at a position corresponding to the residual liquid recovery port, a residual liquid recovery channel is provided on the rotor fixing block, and the residual liquid recovery channel is connected to the residual liquid recovery trough.

[0012] As a preferred embodiment of the present invention, a wear-resistant gasket is provided between the bottom surface of the rotor and the sealing gasket, and the wear-resistant gasket is provided with multiple upper bosses and multiple lower bosses, and the lower bosses are plugged into the first flow holes in a one-to-one correspondence, and the upper bosses and the lower bosses located at the same vertical position are connected to each other to form a second flow hole, and the first flow hole and the second flow hole are connected in a one-to-one correspondence.

[0013] As a preferred solution of the present invention, a light guide strip is provided on the flow path plate, a skirt is provided on the bottom periphery of the gear, one end of the light guide strip is located below the skirt of the gear, and a light hole is provided on the skirt corresponding to the light guide strip.

[0014] The sampling device provided by the present invention has the following advantages compared with the prior art:

[0015] When extracting test samples, the sampling rack is rotated to different angles, and different samples can be connected and transported to the inside of the instrument for testing. In addition, after testing the first sample, the sampling rack is rotated to the initial gear position, and the sampling needle is connected to the liquid outlet, so that the processing medium connected to the liquid outlet flow channel can be transported to the inside of the instrument through the sampling needle, so as to clean the sampling needle or calibrate the instrument or test the instrument performance. With the present invention, the sampling of multiple samples can be achieved through the same sampling rack, and after the sampling needle extracts one sample, the sampling needle can be cleaned by the processing medium connected to the distribution valve, so as to avoid the sample remaining in the sampling needle and causing contamination of the next sample. The steps are simple, the operation is easy, and the accuracy of the detection is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0017] Figure 1 This is a schematic structural diagram of a sampling device provided by an embodiment of the present invention;

[0018] Figure 2 It is a structural diagram of the shell;

[0019] Figure 3 It is a structural diagram of the push rod in a pushed state;

[0020] Figure 4 It is a schematic diagram of the structure of the sampling component;

[0021] Figure 5 It is a structural diagram of the sampling component from another perspective;

[0022] Figure 6 It is a structural diagram of the cam;

[0023] Figure 7 It is an exploded view of the distribution valve;

[0024] Figure 8 It is a structural diagram of the distribution valve;

[0025] Figure 9 is a cross-sectional view of the distribution valve;

[0026] Figure 10It is a structural diagram of the flow path plate;

[0027] Figure 11 This is a structural diagram of the flow plate from another perspective;

[0028] Figure 12 is a schematic diagram of the structure of the rotor assembly;

[0029] Figure 13 This is an exploded view of the rotor assembly.

[0030] Markings in the figure:

[0031] Sampling rack 1; dispensing valve 2; housing 3; sampling assembly 4; cam 5; rotating shaft 6; connecting frame 7; slider 8; compression spring 9; push rod 10; sampling needle 11; guide groove 12; connector 13; fixed boss 14; movable boss 15; slide groove 16; first arc groove 17; second arc groove 18; first straight groove 19; second straight groove 20; stator assembly 21; rotor assembly 22; microfluidic channel 23; flow path plate 24; stator housing 25; flow path tube 26; sealing gasket 27; annular gasket 28; cannula 29; first flow hole 30; probe 31; liquid inlet channel 32; rotor 33; rotor fixing block 34; screw 35; flat plate 36; gear 37; first cavity 38; conical boss 39; liquid outlet 40; second cavity 41; residual liquid recovery port 42; residual liquid recovery trough 43; residual liquid recovery channel 44; wear-resistant gasket 45; second flow hole 46; light guide bar 47; skirt 48; light hole 49; waste liquid recovery port 50; torsion spring 51; torsion spring mounting seat 52; front cover 53; rear cover 54; connecting rod 55; handle 56; flow path plate 57; flow path trough plate 58; first initial locking position A1; first intermediate locking position B1; first terminal locking position C1; second initial locking position A2; second intermediate locking position B2; second terminal locking position C2; first liquid extraction position D1; second liquid extraction position D2. DETAILED DESCRIPTION

[0032] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0034] like Figures 1 to 13 As shown, a preferred embodiment of the present invention provides a sampling device, which includes a sampling rack 1 and a distribution valve 2. The sampling rack 1 is arranged above the distribution valve 2, and the sampling rack 1 is rotatably connected to the instrument. The sampling rack 1 has multiple rotation angles for connecting to different sample input ends. The sampling rack 1 is provided with a sampling needle 11, and the sampling needle 11 is connected to the processing chamber of the instrument. The distribution valve 2 is provided with a liquid outlet 40 and multiple liquid inlet channels connected to multiple different processing medium input ends. The distribution valve 2 is used to switch the connection between the liquid outlet 40 and any one of the liquid inlet channels. In the initial state, the sampling needle 11 is in a vertical state, and the sampling needle 11 is connected to the liquid outlet 40.

[0035] When extracting test samples, the sampling rack 1 is rotated to different angles, and different samples can be connected and transported to the inside of the instrument for testing. In addition, after testing the first sample, the sampling rack 1 is rotated to the initial gear position, and the sampling needle 11 is connected to the liquid outlet 40, so that the processing medium connected to the liquid outlet flow channel can be transported to the inside of the instrument through the sampling needle 11, so as to clean the sampling needle 11 or calibrate the instrument or test the instrument performance. With the present invention, the sampling of multiple samples can be achieved through the same sampling rack 1, and after the sampling needle 11 extracts a sample, the sampling needle 11 can be cleaned by the processing medium connected to the distribution valve 2, so as to avoid the sample remaining in the sampling needle 11 and causing contamination of the next sample. The steps are simple, the operation is easy, and the accuracy of the detection is guaranteed.

[0036] Exemplarily, the sampling rack 1 includes a housing 3, a sampling assembly 4 and a cam 5. The sampling assembly 4 is arranged inside the housing 3. The sampling assembly 4 includes a rotating shaft 6, a connecting frame 7, a slider 8, a compression spring 9, a push rod 10 and the sampling needle 11. The housing 3 is rotatably connected to the cam 5 through the rotating shaft 6. The connecting frame 7 is provided with a guide groove 12 that slides with the slider 8. The compression spring 9 is arranged in the guide groove 12. One end of the push rod 10 is fixed with the slider 8, and the other end of the push rod 10 is provided with a connector 13. The bottom end of the compression spring 9 is against the slider 8, and the connector 13 is provided with an avoidance The rotating shaft 6 is provided with a hollow channel. One end of the sampling needle 11 is movably plugged into the avoidance hole, and the other end of the sampling needle 11 is connected to the hollow channel. The cam 5 is provided with a through hole that cooperates with the hollow channel. The housing 3 is provided with a fixed boss 14 on the side facing the cam 5. The slider 8 is provided with a movable boss 15 on the side facing the cam 5. The housing 3 is provided with a sliding groove 16 for the movable boss 15 to slide. The cam 5 is provided with a first arc groove 17, a second arc groove 18, a first straight groove 19, and a second straight groove 20. The second arc groove 18, the first straight groove 19, and the second straight groove 20 are connected. Specifically, the housing 3 includes a front cover 53 and a rear cover 54. The front cover 53 and the rear cover 54 are connected by a connecting rod 55. The rear cover 54 is provided with a handle 56.

[0037] In this embodiment, when the housing 3 rotates relative to the cam 5 by a first angle, the fixed boss 14 moves from the first initial position A1 to the first intermediate position B1, and the movable boss 15 moves from the second initial position A2 to the second intermediate position B2. At this time, the chute 16 is parallel to the first straight groove 19, pushing the push rod 10 to the first liquid extraction position D1 to achieve liquid extraction. When the housing 3 rotates relative to the cam 5 by a second angle, the fixed boss 14 moves from the first intermediate position B1 to the first terminal position C1, and the movable boss 15 moves from the second intermediate position B2 to the second terminal position C2. At this time, the chute 16 is parallel to the second straight groove 20, pushing the push rod 10 to the second liquid extraction position D2 to achieve liquid extraction. In this way, the sampling rack 1 can achieve multi-point positioning, and multiple samples can be extracted on the same sampling rack 1, which is highly practical.

[0038] For example, a PCB is provided on the side of the cam 5 away from the housing 3. Hall effect sensors are provided on the PCB at locations corresponding to the first initial engagement position A1, the first intermediate engagement position B1, the first terminal engagement position C1, the first liquid extraction position D1, and the second liquid extraction position D2. Magnets are provided on both the fixed boss 14 and the movable boss 15. Thus, the magnets cooperate with the Hall effect sensors to generate an electrical signal that is provided to the instrument. When the corresponding position is reached, the instrument receives the electrical signal, and the corresponding position indicator lights up, ensuring accurate operation.

[0039] Exemplarily, the sampling assembly 4 further includes a torsion spring 51 and a torsion spring mounting seat 52, one end of the torsion spring mounting seat 52 being rotatably connected to the rear cover 54, and the other end of the torsion spring mounting seat 52 being connected to the slider 8. The torsion spring 51 is mounted on the torsion spring mounting seat 52, one end of the torsion spring 51 being connected to the torsion spring mounting seat 52, and the other end of the torsion spring 51 being connected to the connecting frame 7. The provision of the torsion spring 51 enables the housing 3 to rotate more smoothly, ensuring that the fixed boss 14 and the movable boss 15 can smoothly move to the corresponding positions, facilitating operation.

[0040] Exemplarily, the distributing valve 2 includes a stator assembly 21, a rotor assembly 22 and a flow path plate 24 with a plurality of microchannels 23 built in. The stator assembly 21 includes a stator housing 25, a flow tube 26 and a sealing gasket 27. The stator housing 25 is fixed on the flow path plate 24. The sealing gasket 27 is covered on the stator housing 25. There are multiple flow tubes 26, and multiple flow tubes 26 are arranged in the stator housing 25 and are arranged circumferentially. The lower ends of the multiple flow tubes 26 are respectively connected to the corresponding microchannels 23 in the flow path plate 24. The sealing gasket 27 includes an annular gasket 28 and a cannula 29. The bottom surface of the annular gasket 28 is against the upper end surface of the flow tube 26. There are multiple cannula 29, and multiple cannula 29 are fixed on the The bottom of the annular gasket 28 is arranged in a circular pattern, and the cannula 29 is plugged into the flow tube 26 in a one-to-one correspondence. The annular gasket 28 is provided with a first flow hole 30 that is connected to the cannula 29 in a one-to-one correspondence. Each of the microchannels 23 in the flow path plate 24 is connected to a probe 31 for inputting the treatment medium. The probe 31, the microchannel 23, the flow tube 26, the cannula 29 and the first flow hole 30 are connected in sequence. The rotor assembly 22 is rotatably connected to the top of the stator assembly 21. The rotor assembly 22 is provided with a liquid inlet channel 32, and the liquid outlet 40 is connected to the liquid inlet channel 32. When the rotor assembly 22 rotates to a certain angle, the liquid outlet 40 is connected to one of the first flow holes 30.

[0041] Specifically, the flow path plate 24 is provided with a waste liquid recovery port 50, and the flow path plate 24 is provided with a microfluidic channel 23 connected to the waste liquid recovery port 50. The flow path plate 24 includes a flow path plate 57 and a flow path groove plate 58. The stator housing 25 is mounted on the flow path plate 57. The microfluidic channel 23 is formed by a solder seal between the flow path plate 57 and the flow path groove plate. Waste liquid after use in the instrument is driven by the pump body within the instrument through an external pipeline to the waste liquid recovery port 50 and then discharged through the probe 31. This ensures that the waste liquid is properly treated and prevents biological contamination.

[0042] In this embodiment, the processing medium can be a cleaning liquid, a calibration liquid, or a quality inspection liquid. When the analytical instrument issues an instruction to extract the calibration liquid or the quality inspection liquid, the driving end of the instrument drives the rotor to rotate a certain angle, so that the liquid inlet channel 32 is connected to the first flow hole 30, the cannula 29 and the flow tube 26 corresponding to the reagent, and the reagent is extracted into the instrument through the sampling needle 11 to perform instrument calibration; when the analytical instrument issues an instruction to extract the cleaning liquid, the driving end of the instrument drives the rotor to continue to rotate a certain angle, so that the liquid inlet channel 32 is connected to the first flow hole 30, the cannula 29 and the flow tube 26 corresponding to the reagent, and the reagent is extracted into the instrument through the sampling needle 11 on the instrument to perform flow cleaning; thereby, it can be ensured that the sampling needle 11 is not contaminated by each other during the process of extracting multiple different samples for testing.

[0043] Exemplarily, the rotor assembly 22 includes a rotor 33 and a rotor fixing block 34, the rotor is rotatably connected to the top of the stator assembly 21, and the flow path plate 24 and the stator assembly 21 are both provided with mounting holes for the rotor shaft 6 to pass through. The rotor 33 and the rotor fixing block 34 are fixedly connected by screws 35, and the rotor fixing block 34 serves as the rotor shaft 6 and is rotatably connected to the bottom of the flow path plate 24.

[0044] The exemplary rotor 33 includes a flat plate 36 and a gear 37. A first cavity 38 is defined on the top surface of the gear 37. A conical boss 39 is located at the center of the first cavity 38. The liquid outlet 40 is located on the conical boss 39. A second cavity 41 is defined on the bottom surface of the gear 37. The liquid inlet channel 32 is formed by a solder seal between the flat plate 36 and the second cavity 41. This ensures the connection between the flat plate 36 and the gear 37 and prevents them from falling off.

[0045] Illustratively, the conical boss 39 is provided with a plurality of residual liquid recovery ports 42 around it, the flat plate 36 is provided with residual liquid recovery grooves 43 at locations corresponding to the residual liquid recovery ports 42, and the rotor fixing block 34 is provided with a residual liquid recovery channel 44, which is connected to the residual liquid recovery grooves 43. This arrangement allows residual liquid falling from the sampling needle 11 to slide down the conical boss 39 to the residual liquid recovery ports 42, and then flow along the residual liquid recovery grooves 43 to the residual liquid recovery channel 44, thereby preventing biological contamination.

[0046] For example, a wear-resistant gasket 45 is disposed between the bottom surface of the rotor and the sealing gasket 27. The wear-resistant gasket 45 comprises multiple upper and lower bosses. The lower bosses engage with the first flow holes 30 in a one-to-one correspondence. The upper and lower bosses, located at the same vertical position, communicate with each other to form second flow holes 46. The first flow holes 30 and the second flow holes 46 communicate in a one-to-one correspondence. Thus, the wear-resistant gasket 45 prevents wear of the sealing gasket 27 and prevents rotation between the wear-resistant gasket 45 and the sealing gasket 27. Furthermore, the provision of the upper bosses reduces the contact area between the rotor assembly 22 and the wear-resistant gasket 45, thereby reducing friction.

[0047] In this embodiment, the tightness between the rotor assembly 22 and the wear-resistant gasket 45 can be adjusted by screws 35 to ensure a sealed connection between the rotor and the wear-resistant gasket 45 when the rotor rotates normally. At the same time, the pre-tightening force between the sealing gasket 27 and the stator housing 25 ensures that when the rotor rotates, the bottom plane of the wear-resistant gasket 45 can be closely connected with the sealing gasket 27 without leakage.

[0048] Illustratively, a light guide bar 47 is provided on the flow path plate 24, and a skirt 48 is provided on the outer periphery of the bottom of the gear 37. One end of the light guide bar 47 is located below the skirt 48 of the gear 37, and a light hole 49 is provided on the skirt 48 at a position corresponding to the light guide bar 47. As a result, light emitted by an infrared light emitter on a sensor mounted on the instrument is totally reflected by the light guide bar 47, passing through the light hole 49 and being received by the sensor, indicating that the gear 37 has rotated to its initial zero position. Using this as a reference, the rotation angle to other channels can be calculated based on the number of steps the gear 37 has rotated, ensuring smooth reagent detection. To ensure stable transmission of the optical signal, the light guide bar 47 is transparent, while the gear 37 is opaque black.

[0049] In this embodiment, the connector 13 is a sealing plug, the inner wall of which abuts against the outer wall of the sampling needle 11. When the fixed boss 14 is in the first initial gear position and the movable boss 15 is in the second initial gear position, the sampling rack 1 is connected to the liquid inlet channel 32 on the distribution valve 2, and the sealing plug is deformed under the action of the torsion spring 51 and the compression spring 9. The push rod 10 can form a sealed cavity with the distribution valve 2, ensuring that the treatment medium can be smoothly transported into the instrument to prevent biological contamination. In addition, when the sealing plug is reset under the action of the compression spring 9, the sealing plug can scrape the residual liquid on the outer wall of the sampling needle 11 to the distribution valve 2, and enter the interior of the instrument along with the treatment medium, avoiding trace residual liquid residue on the sampling needle 11 and ensuring the accuracy of the detection.

[0050] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A sampling device, characterized in that: The apparatus comprises a sampling rack and a distribution valve, wherein the sampling rack is arranged above the distribution valve and is rotatably connected to the instrument. The sampling rack has multiple rotation angles for connecting to different sample input ends. The sampling rack is provided with a sampling needle, which is connected to the processing chamber of the instrument. The distribution valve is provided with a liquid outlet and multiple liquid inlet channels connected to multiple different processing medium input ends. The distribution valve is used to switch the connection between the liquid outlet and any one of the liquid inlet channels. In the initial state, the sampling needle is in a vertical state and is connected to the liquid outlet. The cam is provided with a through hole that cooperates with the hollow shaft, and the housing is provided with a fixed boss, a movable boss is provided on the side facing the cam, and the housing is provided with a sliding slot for the movable boss to slide. The cam is provided with a first arc groove, a second arc groove, a first straight groove and a second straight groove, and the second arc groove, the first straight groove and the second straight groove are connected.

2. A sampling device according to claim 1, characterized in that: A PCB board is provided on the side of the cam away from the shell, and Hall sensors are provided on the PCB board at positions corresponding to the first initial clamping position, the first intermediate clamping position, the first terminal clamping position, the first liquid pumping position and the second liquid pumping position, and magnets are provided on the fixed boss and the movable boss.

3. A sampling device according to claim 1, characterized in that: The sampling assembly also includes a torsion spring and a torsion spring mounting seat, one end of the torsion spring mounting seat is rotatably connected to the rear cover, the other end of the torsion spring mounting seat is connected to the slider, the torsion spring is installed on the torsion spring mounting seat, one end of the torsion spring is connected to the torsion spring mounting seat, and the other end of the torsion spring is connected to the connecting frame.

4. A sampling device according to any one of claims 1 to 3, characterized in that: The distributing valve includes a stator assembly, a rotor assembly and a flow path plate with multiple microchannels built in. The stator assembly includes a stator housing, a flow path tube and a sealing gasket. The stator housing is fixed on the flow path plate, and the sealing gasket cover is arranged on the stator housing. There are multiple flow path tubes, and the multiple flow path tubes are arranged in the stator housing and are arranged circumferentially. The lower ends of the multiple flow path tubes are respectively connected to the corresponding microchannels in the flow path plate. The sealing gasket includes an annular gasket and an intubation. The bottom surface of the annular gasket is against the upper end surface of the flow path tube. There are multiple intubations, and the multiple intubations are fixed on the annular gasket. The bottom of the stator assembly is rotatably connected to the stator assembly, and the rotor assembly is provided with a liquid inlet channel. The liquid outlet is connected to the liquid inlet channel. When the rotor assembly rotates to a certain angle, the liquid outlet is connected to one of the first flow holes.

5. A sampling device according to claim 4, characterized in that: The rotor assembly includes a rotor and a rotor fixing block. The rotor is rotatably connected to the top of the stator assembly. The flow path plate and the stator assembly are both provided with mounting holes for the rotor shaft to pass through. The rotor and the rotor fixing block are fixedly connected by screws. The rotor fixing block serves as the rotor shaft and is rotatably connected to the bottom of the flow path plate.

6. A sampling device according to claim 5, characterized in that: The rotor includes a flat plate and a gear. A first cavity is provided on the top surface of the gear. A conical boss is provided at the center of the first cavity. The liquid outlet is arranged on the conical boss. A second cavity is provided on the bottom surface of the gear. The liquid inlet channel is formed by a solder seal between the flat plate and the second cavity.

7. A sampling device according to claim 6, characterized in that: A plurality of residual liquid recovery ports are provided around the conical boss, a residual liquid recovery trough is provided on the flat plate at a position corresponding to the residual liquid recovery port, a residual liquid recovery channel is provided on the rotor fixing block, and the residual liquid recovery channel is connected to the residual liquid recovery trough.

8. A sampling device according to claim 6, characterized in that: A wear-resistant gasket is provided between the bottom surface of the rotor and the sealing gasket. The wear-resistant gasket is provided with multiple upper bosses and multiple lower bosses. The lower bosses are plugged into the first flow holes in a one-to-one correspondence. The upper bosses and the lower bosses located at the same vertical position are connected to each other to form a second flow hole. The first flow hole and the second flow hole are connected in a one-to-one correspondence.

9. The sampling device according to claim 6, characterized in that: A light guide strip is provided on the flow path plate, a skirt is provided on the bottom periphery of the gear, one end of the light guide strip is located below the skirt of the gear, and a light hole is provided on the skirt corresponding to the light guide strip.

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