Sampling equipment for liquid chromatography

Abstract

The utility model relates to the technical field of sampling equipment, in particular to liquid chromatogram sampling equipment which comprises a base and a three-dimensional moving module, a plurality of sample boxes arranged in a net shape are placed on the base, box covers are arranged on the sample boxes, a sampler is arranged on the three-dimensional moving module, and the three-dimensional moving module is connected with the base. The base is provided with a placing cavity for placing test tubes, and a cleaning unit, a drying unit and a dirt collecting unit which are positioned at the placing cavity; the sampler comprises a mounting seat mounted on the three-dimensional moving module, a sampling barrel and an electric cylinder are mounted on the mounting seat, one end of the sampling barrel is communicated with a sampling needle, a piston is mounted on a piston rod of the electric cylinder, and the piston is slidably embedded in the other end of the sampling barrel; the dirt collecting unit comprises a clamping base and a water guide plate, the clamping base is connected to the base through a horizontally-arranged spring, and a first guide groove is formed in the upper surface of the clamping base. The utility model has the beneficial effects that the confusion and disorder of sample solutions are avoided, and the sampling efficiency during multiple sampling is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sampling equipment, in particular to a sampling equipment for liquid chromatography. Background Art

[0002] A liquid chromatograph is a liquid chromatography sampling device that uses the difference in the distribution ratio of a mixture between liquid and solid or between two immiscible liquids to first separate the mixture and then analyze and identify it. When in use, the sample solution needs to be collected.

[0003] Through searching, Chinese patent announcement No. CN220188437U discloses a liquid chromatography sampling device, including a base, a tray is fixedly connected to the top of the base, a plurality of placement grooves are opened on the top of the tray, a plurality of placement rings are fixedly connected to the top of the base, the placement rings are connected to the corresponding placement grooves, and a closing component for closing the opening above the placement ring is arranged on one side of the placement ring; the closing component includes two support plates fixedly connected to the top of the tray, and the same rotating rod is rotatably connected between the two support plates. The utility model relates to the technical field of sampling equipment; the liquid chromatography sampling equipment can close the top opening of the placement ring through the setting of the closing component, so as to prevent the solution remaining on the injection needle from dripping into other test tubes when collecting the sample solution, causing confusion of the sample solution and affecting subsequent detection.

[0004] With respect to the above-mentioned related technologies, the inventors of the utility model have found the following defects: if it is necessary to sample solutions in different test tubes, the injection needle needs to be inserted into each test tube one by one, and the residual solution on the injection needle will still cause confusion of the sample solution; if a new injection needle is replaced and the old injection needle is cleaned and dried, the operation is cumbersome and time-consuming, which affects the sampling efficiency, and therefore needs to be improved. Utility Model Content

[0005] In order to solve the above problems, the embodiment of the utility model provides a liquid chromatography sampling device, which avoids confusion of sample solutions and improves the sampling efficiency during multiple samplings.

[0006] In order to achieve the above-mentioned purpose, the embodiment of the utility model specifically adopts the following technical scheme: a liquid chromatography sampling device, comprising a base and a three-dimensional mobile module, a plurality of sample boxes arranged in a mesh are placed on the base, a box cover is provided on the sample box, a sampler is provided on the three-dimensional mobile module, a placement cavity for placing a test tube and a cleaning unit, a drying unit and a dirt collecting unit located at the placement cavity are provided on the base;

[0007] The sampler includes a mounting seat mounted on the three-dimensional moving module, a sampling tube and an electric cylinder are mounted on the mounting seat, one end of the sampling tube is connected to a sampling needle, a piston is mounted on the piston rod of the electric cylinder, and the piston is slidably embedded in the other end of the sampling tube;

[0008] The cleaning unit is connected to the sampling tube through a water pipe, and the cleaning unit can let water into the sampling tube through the water pipe;

[0009] The drying unit is connected to the sampling tube through an air duct, and the drying unit can pass hot air into the sampling tube through the air duct;

[0010] The sewage collecting unit comprises a card seat and a water guide plate, wherein the card seat is connected to the base through a horizontally arranged spring, and a first guide groove is arranged on the upper surface of the card seat; the middle part of the water guide plate is connected to the base through a horizontal axis rotation and is connected to the base through a first torsion spring, one end of the water guide plate is provided with a second guide groove for the card seat to slide and embed, and the other end of the water guide plate is provided with a water guide cavity;

[0011] A first pressure rod is installed on the piston. When the electric cylinder drives the piston to descend, so that the sample in the sampling cylinder is pushed out into the test tube, the first pressure rod will be inserted into the first guide groove, so that the card seat slides out of the second guide groove, the spring will be in a deformed state, the first torsion spring will return to a natural state and make the water guide cavity flip to the bottom of the sampler;

[0012] When the first pressure rod is separated from the holder, the spring will return to its natural state, so that the holder is inserted into the second guide groove and causes the water guide plate to flip until the water guide plate is separated from the top of the test tube, at which time the first torsion spring will be in a deformed state.

[0013] Optionally, the cleaning unit includes a water tank and a water pump, the water inlet of the water pump is connected to the inside of the water tank, the water outlet of the water pump is connected to the sampling cylinder through a water pipe, and a first one-way valve is installed on the water pipe.

[0014] Optionally, the drying unit includes a hot air blower, which is connected to the sampling cylinder through an air duct, and a second one-way valve is installed on the air duct.

[0015] Optionally, it further includes a control unit, the control unit includes a controller and a contact sensor installed on the base, and the contact sensor, the water pump and the hot air blower are all coupled to the controller;

[0016] When the electric cylinder drives the piston to descend, so that the sample in the sampling cylinder is pushed into the test tube, the first pressure rod will abut against the contact sensor, and the contact sensor will send a cleaning signal to the processor, and the processor will control the water pump and the hot air blower to start for a specified period of time.

[0017] Optionally, a sewage box located on one side of the test tube is placed on the base, and a water guide cavity located directly below the sampler can guide the sewage into the sewage box.

[0018] Optionally, a storage shell is installed on the water guide plate, and a through hole is provided on the storage shell;

[0019] When the water guiding cavity is turned over to be directly below the sampler, the sampling needle will be located inside the storage shell and spaced apart from the inner wall of the storage shell. The through hole is located at the bottom of the storage shell, and the storage shell is located above the water guiding cavity.

[0020] Optionally, the first guide groove runs through the front and rear sides of the card holder, and the first pressure rod can slide in the horizontal direction to disengage from the first guide groove.

[0021] Optionally, there are two box covers on the sample box, and the two box covers are arranged as double-doors, and the middle part of the sample box is rotatably connected to the sample box and connected to the sample box through a second torsion spring;

[0022] When the second torsion spring is in a natural state, the opposite ends of the two box covers will be jointly closed at the box opening of the sample box, and the opposite ends of the two box covers will be located outside the sample box.

[0023] Optionally, two second pressure rods are installed on the sampler. Before the sampler descends into the sample box, the sampler will press down the corresponding box covers through the two second pressure rods respectively, and the ends of the two box covers that are away from each other will flip downward to expose the box opening of the sample box.

[0024] The beneficial effects of the embodiments of the utility model are:

[0025] 1. Before the sampler descends into the sample box, the sampler will press down the corresponding box covers through the two second pressing rods, and the ends of the two box covers that are separated from each other will flip downward, and the ends of the two box covers that are opposite to each other will flip upward, so that the box opening of the sample box is exposed, so that the sampler can directly sample the sample solution in the sample box;

[0026] 2. When the sampler has finished sampling, the sampler will rise and separate from the sample box, the second pressure rod will rise and separate from the box cover, and the second torsion spring will gradually return to its natural state, so that the box cover is re-closed on the sample box to prevent the sample solution from being mixed up;

[0027] 3. When all the sample solution in the sampler is discharged, the first pressure rod will contact the contact sensor, and the contact sensor will send a cleaning signal to the processor, and the processor will control the water pump and the hot air blower to start for the specified time in sequence; the water pump will draw clean water from the water tank, and the clean water will enter the sampling cylinder through the water pipe, so as to flush the inside of the sampling cylinder and the sampling needle; the hot air blower will blow hot air into the sampling cylinder through the air duct, so as to dry the inside of the sampling cylinder and the sampling needle, so that the sampler can quickly perform the next sampling, avoiding confusion of the sample solution and improving the sampling efficiency during multiple sampling;

[0028] 4. When all the sample solution in the sampler is discharged, the first pressure rod will be inserted into the first guide groove, so that the holder slides out of the second guide groove, the first torsion spring will return to the natural state and cause the water guide plate to flip, the water guide cavity will flip to the bottom of the sampler, and the clean water used to clean the sampler will be discharged into the water guide cavity through the sampling needle after cleaning, thus preventing sewage from entering the test tube;

[0029] 5. After the sampler is cleaned and dried, the three-dimensional moving module will drive the sampler to move, so that the first pressure rod is separated from the holder, the spring will return to the natural state, so that the holder is inserted into the second guide groove, and the holder will slide on the groove wall of the second guide groove, so that the water guide plate is turned over until the water guide plate is separated from the top of the test tube, so as to ensure that the subsequent sampler can directly inject the sample solution into the test tube;

[0030] 6. When the water guiding cavity is flipped to the bottom of the sampler, the sampling needle will be located inside the storage shell and spaced apart from the inner wall of the storage shell, the through hole will be located at the bottom of the storage shell, and the storage shell will be located above the water guiding cavity; that is, the sewage and hot air discharged from the sampling needle will enter the storage shell, part of the sewage and part of the hot air will directly pass through the through hole and flow into the water guiding cavity, and another part of the sewage and another part of the hot air will overflow from the top opening of the storage shell, thereby achieving the cleaning and drying of the outside of the sampling needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application;

[0032] Figure 2 It is a schematic diagram of the structure of a three-dimensional mobile module, a sampler and a sample box in an embodiment of the present application;

[0033] Figure 3 is a schematic diagram of the structure of the sampler and the sample box in the embodiment of the present application;

[0034] Figure 4 is a schematic cross-sectional structural diagram of a sampler and a sample box in an embodiment of the present application;

[0035] Figure 5 It is a schematic diagram of the structure of the sampler and the pollution collection unit in the embodiment of the present application;

[0036] Figure 6 It is a schematic diagram of the structure of the sewage collection unit, the test tube and the sewage box in the embodiment of the present application;

[0037] Figure 7 It is a schematic structural diagram of the first pressure rod and the dirt collecting unit in an embodiment of the present application;

[0038] Figure 8 It is a schematic diagram of the structure of the sewage collection unit in the embodiment of the present application.

[0039] Figure numerals: 1, base; 11, sample box; 12, box cover; 121, second torsion spring; 13, placement chamber; 14, test tube; 15, sewage box; 2, three-dimensional moving module; 3, sampler; 31, mounting seat; 32, sampling cylinder; 33, sampling needle; 34, electric cylinder; 35, piston; 36, first pressure rod; 37, second pressure rod; 4, cleaning unit; 41, water tank; 42, water pump; 43, water pipe; 44, The first one-way valve; 5. the drying unit; 51. the hot air blower; 52. the air duct; 53. the second one-way valve; 6. the dirt collecting unit; 61. the holder; 611. the first guide groove; 62. the spring; 63. the water guide plate; 631. the second guide groove; 632. the horizontal axis; 633. the water guide cavity; 634. the first torsion spring; 64. the storage shell; 641. the through hole; 7. the control unit; 71. the controller; 72. the contact sensor. DETAILED DESCRIPTION

[0040] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0041] See also Figure 1-8 The utility model embodiment discloses a liquid chromatography sampling device. Figure 1 As shown, a liquid chromatography sampling device includes a base 1 and a three-dimensional movable module 2. A plurality of sample boxes 11 arranged in a grid are placed on the base 1. The sample boxes 11 are provided with a box cover 12. The three-dimensional movable module 2 is provided with a sampler 3. The three-dimensional movable module 2 can drive the sampler 3 to move in three dimensions so that the sampler 3 can sample any sample box 11.

[0042] The base 1 is provided with a placement cavity 13 , in which a test tube 14 for collecting samples can be placed, and the sampler 3 can inject the sample into the test tube 14 .

[0043] like Figure 2 and Figure 3 As shown, the sampler 3 includes a mounting base 31 mounted on the three-dimensional moving module 2, on which a vertically arranged sampling barrel 32 and an electric cylinder 34 are mounted, the lower end of the sampling barrel 32 is connected to a sampling needle 33, the piston 35 of the electric cylinder 34 extends in the vertical direction and is mounted with a piston 35, and the piston 35 is slidably embedded in the upper end of the sampling barrel 32. The electric cylinder 34 drives the piston 35 to rise, so that the sample solution is sucked into the sampling barrel 32; the electric cylinder 34 drives the piston 35 to descend, so that the sample solution is injected into the test tube 14 through the sampling needle 33.

[0044] like Figure 3 and Figure 4As shown, there are two box covers 12 on the sample box 11 , and the two box covers 12 are arranged as double doors. The middle part of the sample box 11 is rotatably connected to the sample box 11 and is connected to the sample box 11 through a second torsion spring 121 .

[0045] When the second torsion spring 121 is in a natural state, the opposite ends of the two box covers 12 will be jointly sealed on the box opening of the sample box 11 to ensure the sealing effect of the sample box 11 to prevent the sample solution from being mixed up; and the opposite ends of the two box covers 12 will be located on the outside of the sample box 11, so that the worker can press the box cover 12 to open it.

[0046] Two second pressure rods 37 are installed on the sampler 3. Before the sampler 3 descends into the sample box 11, the sampler 3 will press down the corresponding box covers 12 through the two second pressure rods 37, and the ends of the two box covers 12 that are away from each other will flip downward, and the ends of the two box covers 12 that are opposite to each other will flip upward, so that the box opening of the sample box 11 is exposed, so that the sampler 3 can directly sample the sample solution in the sample box 11.

[0047] When the sampler 3 completes sampling, the sampler 3 will rise and separate from the sample box 11, the second pressure rod 37 will rise and separate from the box cover 12, and the second torsion spring 121 will gradually return to a natural state, so that the box cover 12 is re-sealed on the sample box 11 to prevent the sample solution from being mixed up.

[0048] like Figure 1 , Figure 3 and Figure 5 As shown, a cleaning unit 4, a drying unit 5, a dirt collecting unit 6 and a control unit 7 are provided at the placement cavity 13. The cleaning unit 4 includes a water tank 41 and a water pump 42. The water inlet end of the water pump 42 is connected to the inside of the water tank 41, and the water outlet end of the water pump 42 is connected to the sampling tube 32 through a water pipe 43, and a first one-way valve 44 is installed on the water pipe 43; the drying unit 5 includes a hot air blower 51, and the hot air blower 51 is connected to the sampling tube 32 through an air duct 52, and a second one-way valve 53 is installed on the air duct 52; the control unit 7 includes a controller 71 and a contact sensor 72 installed on the base 1, and the contact sensor 72, the water pump 42 and the hot air blower 51 are all coupled to the controller 71; a first pressure rod 36 is installed on the piston 35.

[0049] When the three-dimensional moving module 2 drives the sampler 3 that has completed sampling to move to the top of the test tube 14, the electric cylinder 34 will drive the piston 35 to descend, so that the sample in the sampling cylinder 32 is pushed out into the test tube 14, and the piston 35 will drive the first pressure rod 36 to descend synchronously during the descending process; when the sample solution in the sampler 3 is completely discharged, the first pressure rod 36 will contact the contact sensor 72, and the contact sensor 72 will send a cleaning signal to the processor, and the processor will control the water pump 42 and the hot air The machines 51 are turned on for a specified period of time; the water pump 42 draws clean water from the water tank 41, and the clean water enters the sampling tube 32 through the water pipe 43, thereby flushing the inside of the sampling tube 32 and the inside of the sampling needle 33; the hot air blower 51 blows hot air into the sampling tube 32 through the air duct 52, thereby drying the inside of the sampling tube 32 and the inside of the sampling needle 33, so that the sampler 3 can quickly perform the next sampling, avoiding confusion of the sample solution and improving the sampling efficiency during multiple samplings.

[0050] It is worth noting that the provision of the first one-way valve 44 and the second one-way valve 53 prevents the air in the sampling tube 32 from entering the air duct 52 and the water pipe 43 , so that the sampler 3 can suck the sample solution into the sampling tube 32 .

[0051] like Figures 5 to 8 As shown, the sewage collecting unit 6 includes a holder 61 and a water guide plate 63. The holder 61 is connected to the base 1 through a horizontally arranged spring 62. A first guide groove 611 is provided on the upper surface of the holder 61. The middle part of the water guide plate 63 is rotatably connected to the base 1 through a horizontal axis 632 and is connected to the base 1 through a first torsion spring 634. One end of the water guide plate 63 is provided with a second guide groove 631 for the holder 61 to slide and embed, and the other end of the water guide plate 63 is provided with a water guide cavity 633. A first pressure rod 36 is installed on the piston 35.

[0052] When the electric cylinder 34 drives the piston 35 to descend, so that the sample in the sampling tube 32 is pushed out into the test tube 14, the first pressure rod 36 will be inserted into the first guide groove 611, and the first pressure rod 36 will slide on the groove wall of the first guide groove 611, so that the holder 61 slides out of the second guide groove 631, the spring 62 will gradually deform, the first torsion spring 634 will return to the natural state and cause the water guide plate 63 to flip, and the water guide cavity 633 will flip to the bottom of the sampler 3. After cleaning, the clean water used to clean the sampler 3 will be discharged into the water guide cavity 633 through the sampling needle 33, thereby preventing sewage from entering the test tube 14.

[0053] It is worth noting that a sewage box 15 located on one side of the test tube 14 is placed on the base 1, and the water guide cavity 633 located directly below the sampler 3 can guide the sewage into the sewage box 15 for collection of the sewage.

[0054] After the sampler 3 is cleaned and dried, the three-dimensional movable module 2 will drive the sampler 3 to move, so that the first pressure rod 36 will be separated from the holder 61, and the spring 62 will return to its natural state, so that the holder 61 will be inserted into the second guide groove 631, and the holder 61 will slide on the groove wall of the second guide groove 631, so that the water guide plate 63 will flip over until the water guide plate 63 is separated from the top of the test tube 14, so as to ensure that the subsequent sampler 3 can directly inject the sample solution into the test tube 14. At this time, the first torsion spring 634 will be in a deformed state.

[0055] It is worth noting that the first guide groove 611 runs through the front and rear sides of the holder 61 , and the three-dimensional movable module 2 can drive the sampler 3 to move horizontally, so that the first pressure rod 36 slides in the horizontal direction and disengages from the first guide groove 611 .

[0056] A storage shell 64 is mounted on the water guide plate 63, and a through hole 641 is provided on the storage shell 64. When the water guide cavity 633 is turned over to the right below the sampler 3, the sampling needle 33 will be located inside the storage shell 64 and spaced apart from the inner wall of the storage shell 64, and the through hole 641 is located at the bottom of the storage shell 64, and the storage shell 64 is located above the water guide cavity 633; ​​that is, the sewage and hot air discharged from the sampling needle 33 will enter the storage shell 64, part of the sewage and part of the hot air will directly pass through the through hole 641 and flow into the water guide cavity 633, and another part of the sewage and another part of the hot air will overflow from the top opening of the storage shell 64, thereby achieving the cleaning and drying of the outside of the sampling needle 33.

[0057] The working principle of the utility model is as follows: during the sample sampling process, the three-dimensional movable module 2 can drive the sampler 3 to move in three dimensions, so that the sampler 3 can move to the top of any sample box 11; then the three-dimensional movable module 2 will drive the sampler 3 to descend, and the sampler 3 will press down the corresponding box cover 12 through two second pressure rods 37 respectively, so that the box opening of the sample box 11 is exposed, so that the sampling needle 33 of the sampler 3 can descend and sink into the interior of the sample box 11, and at this time the electric cylinder 34 will drive the piston 35 to rise, so that the sample solution passes through the sampling needle 33 and enters the sampling tube 32.

[0058] Afterwards, the three-dimensional motion module will drive the sampler 3 to move back to the top of the test tube 14, and the second torsion spring 121 will gradually return to its natural state, so that the box cover 12 is re-closed on the sample box 11 to prevent the sample solution from being confused; the electric cylinder 34 will drive the piston 35 to descend, so that the sample in the sampling tube 32 is pushed out into the test tube 14.

[0059] When all the sample solution in the sampler 3 is discharged, the first pressure rod 36 will be inserted into the first guide groove 611 and abut against the contact sensor 72, the holder 61 will slide out of the second guide groove 631, the first torsion spring 634 will return to the natural state and cause the water guide plate 63 to flip, and the water guide cavity 633 will flip to the bottom of the sampler 3; the contact sensor 72 will send a cleaning signal to the processor, and the processor will control the water pump 42 and the hot air blower 51 to start for a specified period of time; the water pump 42 will draw clean water from the water tank 41, and the clean water will pass through The water pipe 43 enters into the sampling barrel 32, realizing the flushing of the inside of the sampling barrel 32 and the inside of the sampling needle 33. The sewage after flushing will enter into the storage shell 64 through the sampling needle 33 and clean the outside of the sampling needle 33. The sewage after cleaning will flow into the sewage box 15 through the water guide cavity 633; ​​the hot air blower 51 will blow hot air into the sampling barrel 32 through the air duct 52, realizing the drying of the inside of the sampling barrel 32 and the inside of the sampling needle 33, and then the hot air will enter into the storage shell 64 through the sampling needle 33 and dry the outside of the sampling needle 33.

[0060] Afterwards, the three-dimensional movable module 2 will drive the sampler 3 to move to continue sampling, the first pressure rod 36 will be detached from the holder 61, and the spring 62 will return to its natural state, so that the holder 61 is inserted into the second guide groove 631, and the holder 61 will slide on the groove wall of the second guide groove 631, so that the water guide plate 63 flips over until the water guide plate 63 is detached from the top of the test tube 14, so as to ensure that the subsequent sampler 3 can directly inject the sample solution into the test tube 14.

[0061] In summary, the present application can sample the sample solution in any sample box 11, and automatically clean and dry the sampler 3 after automatic sampling, so that the sampler 3 can quickly perform the next sampling, avoiding confusion of the sample solution and improving the sampling efficiency during multiple sampling.

[0062] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0063] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0064] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0065] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A liquid chromatography sampling device, comprising a base (1) and a three-dimensional movable module (2), wherein a plurality of sample boxes (11) arranged in a mesh are placed on the base (1), a box cover (12) is provided on the sample box (11), and a sampler (3) is provided on the three-dimensional movable module (2), characterized in that: The base (1) is provided with a placement cavity (13) for placing the test tube (14), and a cleaning unit (4), a drying unit (5) and a dirt collecting unit (6) located in the placement cavity (13); The sampler (3) comprises a mounting seat (31) mounted on the three-dimensional movable module (2), a sampling tube (32) and an electric cylinder (34) being mounted on the mounting seat (31), one end of the sampling tube (32) being connected to a sampling needle (33), a piston (35) being mounted on a piston rod (35) of the electric cylinder (34), and the piston (35) being slidably embedded in the other end of the sampling tube (32); The cleaning unit (4) is connected to the sampling tube (32) through a water pipe (43), and the cleaning unit (4) can flow water into the sampling tube (32) through the water pipe (43); The drying unit (5) is connected to the sampling tube (32) through the air duct (52), and the drying unit (5) can pass hot air into the sampling tube through the air duct (52); The sewage collecting unit (6) comprises a card seat (61) and a water guide plate (63); the card seat (61) is connected to the base (1) via a horizontally arranged spring (62); a first guide groove (611) is provided on the upper surface of the card seat (61); a middle part of the water guide plate (63) is rotatably connected to the base (1) via a horizontal axis (632) and is connected to the base (1) via a first torsion spring (634); one end of the water guide plate (63) is provided with a second guide groove (631) for the card seat (61) to be slidably embedded; and the other end of the water guide plate (63) is provided with a water guide cavity (633); A first pressure rod (36) is installed on the piston (35). When the electric cylinder (34) drives the piston (35) to descend, so that the sample in the sampling tube (32) is pushed out into the test tube (14), the first pressure rod (36) will be inserted into the first guide groove (611), so that the holder (61) slides out of the second guide groove (631), the spring (62) will be in a deformed state, the first torsion spring (634) will return to a natural state and the water guide cavity (633) will flip to the bottom of the sampler (3); When the first pressure rod (36) is separated from the holder (61), the spring (62) will return to a natural state, so that the holder (61) is inserted into the second guide groove (631) and causes the water guide plate (63) to flip over until the water guide plate (63) is separated from the top of the test tube (14). At this time, the first torsion spring (634) will be in a deformed state.

2. A liquid chromatography sampling device according to claim 1, characterized in that: The cleaning unit (4) comprises a water tank (41) and a water pump (42); a water inlet of the water pump (42) is connected to the interior of the water tank (41); a water outlet of the water pump (42) is connected to the sampling cylinder (32) via a water pipe (43); and a first one-way valve (44) is installed on the water pipe (43).

3. A liquid chromatography sampling device according to claim 2, characterized in that: The drying unit (5) comprises a hot air blower (51), the hot air blower (51) is connected to the sampling cylinder (32) through an air duct (52), and a second one-way valve (53) is installed on the air duct (52).

4. A liquid chromatography sampling device according to claim 3, characterized in that: It also includes a control unit (7), the control unit (7) including a controller (71) and a contact sensor (72) installed on the base (1), the contact sensor (72), the water pump (42) and the hot air blower (51) are all coupled to the controller (71); When the electric cylinder (34) drives the piston (35) to descend, so that the sample in the sampling tube (32) is pushed out into the test tube (14), the first pressure rod (36) will abut against the contact sensor (72), and the contact sensor (72) will send a cleaning signal to the processor, and the processor will control the water pump (42) and the hot air blower (51) to start successively for a specified period of time.

5. A liquid chromatography sampling device according to claim 1, characterized in that: A sewage box (15) located on one side of the test tube (14) is placed on the base (1), and a water guide cavity (633) located directly below the sampler (3) can guide the sewage into the sewage box (15).

6. A liquid chromatography sampling device according to claim 1, characterized in that: A storage shell (64) is installed on the water guide plate (63), and a through hole (641) is provided on the storage shell (64); When the water guiding cavity (633) is turned over to be directly below the sampler (3), the sampling needle (33) will be located inside the storage shell (64) and spaced apart from the inner wall of the storage shell (64), the through hole (641) is located at the bottom of the storage shell (64), and the storage shell (64) is located above the water guiding cavity (633).

7. A liquid chromatography sampling device according to claim 1, characterized in that: The first guide groove (611) runs through the front and rear sides of the holder (61), and the first pressing rod (36) can slide in the horizontal direction and disengage from the first guide groove (611).

8. The liquid chromatography sampling device according to claim 1, characterized in that: There are two box covers (12) on the sample box (11), and the two box covers (12) are arranged in a double-door arrangement. The middle part of the sample box (11) is rotatably connected to the sample box (11) and is connected to the sample box (11) via a second torsion spring (121); When the second torsion spring (121) is in a natural state, the opposite ends of the two box covers (12) will be jointly sealed at the box opening of the sample box (11), and the opposite ends of the two box covers (12) will be located outside the sample box (11).

9. A liquid chromatography sampling device according to claim 8, characterized in that: Two second pressing rods (37) are installed on the sampler (3). Before the sampler (3) is lowered into the sample box (11), the sampler (3) will press down the corresponding box covers (12) respectively through the two second pressing rods (37), and the ends of the two box covers (12) that are away from each other will flip downward, so that the box opening of the sample box (11) is exposed.

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