Sampling equipment for liquid chromatography

Abstract

The invention 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 device 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 present application relates to the technical field of sampling equipment, in particular to a sampling equipment of liquid chromatography. BACKGROUND

[0002] The sampling equipment of liquid chromatography is an instrument for separating and analyzing a mixture by using the difference in distribution ratio of the mixture between liquid-solid or two immiscible liquids. When used, the sample solution needs to be collected.

[0003] Through retrieval, a liquid chromatography sampling equipment is disclosed in Chinese patent publication No. CN220188437U, which comprises a base, a tray fixedly connected to the top of the base, a plurality of placing grooves opened in the top of the tray, a plurality of placing rings fixedly connected to the top of the base, the placing rings being in communication with the corresponding placing grooves, and a closing assembly arranged on one side of the placing ring for closing the opening above the placing ring. The closing assembly comprises two support plates fixedly connected to the top of the tray, and a same rotating rod rotatably connected between the two support plates. The present application relates to the technical field of sampling equipment. The liquid chromatography sampling equipment can close the top opening of the placing ring through the closing assembly, prevent the residual solution on the injection needle from dropping into other test tubes when collecting the sample solution, and cause the sample solution to be confused and disordered, thereby affecting subsequent detection.

[0004] For the related technology in the above, the inventors found that the following defects exist: if the solution in different test tubes needs to be sampled, 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 the sample solution to be confused and disordered; if a new injection needle is replaced and the old injection needle is cleaned and dried, the operation is relatively complicated and time-consuming, which affects the sampling efficiency, and therefore needs to be improved. SUMMARY

[0005] In order to solve the above problems, the present application provides a sampling equipment of liquid chromatography, which avoids the confusion and disorder of the sample solution and improves the sampling efficiency when sampling multiple times.

[0006] In order to achieve the above purpose, the present application specifically adopts the following technical solution: a sampling equipment of liquid chromatography, comprising a base and a three-dimensional moving module, a plurality of sample boxes arranged in a net shape are placed on the base, a box cover is arranged on the sample box, a sampler is arranged on the three-dimensional moving module, a placing cavity for placing test tubes is arranged on the base, and a cleaning unit, a drying unit and a pollution collection unit are arranged at the placing cavity;

[0007] The sampler comprises a mounting base mounted on a three-dimensional moving module, a sampling cylinder and an electric cylinder mounted on the mounting base, one end of the sampling cylinder being communicated with a sampling needle, and a piston rod of the electric cylinder being mounted with a piston slidingly embedded in the other end of the sampling cylinder;

[0008] The cleaning unit is communicated with the sampling cylinder through a water pipe, and the cleaning unit can feed water into the sampling cylinder through the water pipe.

[0009] The drying unit is communicated with the sampling cylinder through an air pipe, and the drying unit can introduce hot air into the sampling cylinder through the air pipe.

[0010] The sewage collecting unit comprises a clamping seat and a water guide plate, the clamping seat is connected to the base through a horizontally arranged spring, and the upper surface of the clamping seat is provided with a first guide groove; the middle part of the water guide plate is rotatably connected to the base through a horizontal shaft and connected to the base through a first torsional spring, one end of the water guide plate is provided with a second guide groove for slidingly embedding the clamping seat, and the other end of the water guide plate is provided with a water guide cavity.

[0011] The piston is mounted with a first pressing rod, when the electric cylinder drives the piston to descend, the sample in the sampling cylinder is pushed out into the test tube, the first pressing rod is inserted into the first guide groove, the clamping seat is slidably separated from the second guide groove, the spring is in a deformed state, the first torsional spring returns to a natural state and makes the water guide cavity turn over to be directly below the sampler;

[0012] When the first pressing rod is separated from the clamping seat, the spring returns to a natural state, the clamping seat is inserted into the second guide groove and the water guide plate is turned over until the water guide plate is separated from the test tube directly above, at this time, the first torsional spring is in a deformed state;

[0013] The base is placed with a sewage box on one side of the test tube, and the water guide cavity directly below the sampler can guide the sewage into the sewage box;

[0014] The water guide plate is mounted with a storage shell, and the storage shell is provided with a through hole;

[0015] When the water guide cavity turns over to be directly below the sampler, the sampling needle is located in the interior of the storage shell and is 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 guide cavity.

[0016] Optionally, the cleaning unit comprises a water tank and a water pump, the water inlet end of the water pump is communicated with the interior of the water tank, the water outlet end of the water pump is communicated with the sampling cylinder through a water pipe, and the water pipe is mounted with a first one-way valve.

[0017] Optionally, the drying unit comprises a hot air machine, the hot air machine is communicated with the sampling cylinder through an air pipe, and the air pipe is mounted with a second one-way valve.

[0018] Optionally, the control unit is further included, the control unit comprises a controller installed on the base and a contact sensor, the contact sensor, the water pump and the hot air machine are coupled to the controller.

[0019] When the electric cylinder drives the piston to descend, the sample in the sampling cylinder is pushed out into the test tube, the first pressing rod will be in contact with the contact sensor, the contact sensor will send a cleaning signal to the processor, and the processor will control the water pump and the hot air machine to be opened in turn for a specified time length.

[0020] Optionally, the first guide groove penetrates through the front and back of the clamping seat, and the first pressing rod can slide away from the first guide groove in the horizontal direction.

[0021] Optionally, the sample box has two box covers in total, the two box covers are arranged in a double-door manner, and the middle part of the sample box is rotationally connected to the sample box and connected to the sample box through a second torsional spring.

[0022] When the second torsional spring is in a natural state, the opposite ends of the two box covers are jointly closed to the box opening of the sample box, and the ends away from each other of the two box covers are located outside the sample box.

[0023] Optionally, the sampler is provided with two second pressing rods, before the sampler descends into the sample box, the sampler will press the corresponding box cover through the two second pressing rods, the ends away from each other of the two box covers will be turned downward, and the opposite ends of the two box covers will be turned upward, so that the box opening of the sample box is exposed.

[0024] The embodiment of the application has the following beneficial effects:

[0025] 1. Before the sampler descends into the sample box, the sampler will press the corresponding box cover through the two second pressing rods, the ends away from each other of the two box covers will be turned downward, and the opposite ends of the two box covers will be turned 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 sampling of the sampler is completed, the sampler will ascend and separate from the sample box, the second pressing rod will ascend and separate from the box cover, the second torsional spring will gradually return to the natural state, so that the box cover is re-closed to the sample box, so as to prevent the sample solution from being confused and disordered.

[0027] 3. When the sample solution in the sampler is completely discharged, the first pressure rod will be in contact with the contact sensor, which will send a cleaning signal to the processor, and the processor will control the water pump and the hot air blower to be turned on for a specified time; the water pump will draw clean water in the water tank, which will enter the sampling cylinder through the water pipe, realizing the flushing of 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 pipe, realizing the drying of the inside of the sampling cylinder and the sampling needle, so that the sampler can quickly sample the next time, avoiding confusion of the sample solution and improving the sampling efficiency of multiple sampling;

[0028] 4. When the sample solution in the sampler is completely discharged, the first pressure rod will be inserted into the first guide groove, so that the seat is slid off from the second guide groove, the first torsional spring returns to the natural state and promotes the water guide plate to turn over, and the water guide cavity is turned over to be directly below the sampler, so that the clean water for cleaning the sampler is discharged into the water guide cavity after cleaning, avoiding sewage from entering the test tube;

[0029] 5. After the sampler is cleaned and dried, the three-dimensional moving module drives the sampler to move, so that the first pressure rod is separated from the seat, the spring returns to the natural state, the seat is inserted into the second guide groove, and the seat slides on the groove wall of the second guide groove, so that the water guide plate turns over until the water guide plate is separated from directly above the test tube, to ensure that the subsequent sampler can directly inject the sample solution into the test tube;

[0030] 6. When the water guide cavity is turned over to be directly below the sampler, the sampling needle is located in the inside of the storage shell and is 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 guide cavity; that is, the sewage and hot air discharged from the sampling needle enter the storage shell, part of the sewage and part of the hot air directly pass through the through hole and flow into the water guide cavity, and the other part of the sewage and the other part of the hot air overflow from the top opening of the storage shell, thereby realizing the cleaning and drying of the outside of the sampling needle. BRIEF DESCRIPTION OF DRAWINGS

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

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

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

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

[0035] Figure 5is a structural schematic diagram of a sampler and a sewage collecting unit in the embodiment of the present application;

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

[0037] Figure 7 is a structural schematic diagram of a first pressing rod and a sewage collecting unit in the embodiment of the present application;

[0038] Figure 8 is a structural schematic diagram of a sewage collecting unit in the embodiment of the present application.

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

[0040] The preferred embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application, and are not intended to limit the protection scope of the present application.

[0041] Referring to Figures 1-8 , the embodiment of the present application discloses a sampling device for liquid chromatography. As shown in Figure 1 , a sampling device for liquid chromatography comprises a base 1 and a three-dimensional moving module 2, a plurality of sample boxes 11 arranged in a net shape are placed on the base 1, a box cover 12 is arranged on the sample box 11, a sampler 3 is arranged on the three-dimensional moving module 2, and the three-dimensional moving module 2 can drive the sampler 3 to move in three dimensions, so that the sampler 3 can sample any one of the sample boxes 11.

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

[0043] As shown in Figure 2 and Figure 3As shown, the sampler 3 comprises a mounting seat 31 mounted on the three-dimensional moving module 2, and a sampling cylinder 32 and an electric cylinder 34 vertically arranged on the mounting seat 31. The sampling cylinder 32 is communicated with a sampling needle 33 at the lower end thereof, and the electric cylinder 34 is provided with a piston 35 rod extending in the vertical direction and provided with a piston 35 slidingly arranged in the upper end of the sampling cylinder 32. The electric cylinder 34 can make the sample solution be sucked into the sampling cylinder 32 by driving the piston 35 to rise, and the electric cylinder 34 can make the sample solution be injected into the test tube 14 through the sampling needle 33 by driving the piston 35 to descend.

[0044] As shown in Figure 3 and Figure 4 , the sample box 11 is provided with two box covers 12 arranged in a double door manner, and the middle part of the sample box 11 is rotatably connected to the sample box 11 and 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 closed to the box opening of the sample box 11 to ensure the sealing effect of the sample box 11 and prevent the sample solution from being confused and disordered, and the ends of the two box covers 12 away from each other will be located outside the sample box 11 so as to be pressed to open the box cover 12 by the worker.

[0046] The sampler 3 is provided with two second pressing rods 37, and before the sampler 3 is lowered into the sample box 11, the sampler 3 will press the corresponding box cover 12 through the two second pressing rods 37, the ends of the two box covers 12 away from each other will be turned downward, and the opposite ends of the two box covers 12 will be turned upward, so that the box opening of the sample box 11 is exposed, and the sampler 3 can directly sample the sample solution in the sample box 11.

[0047] When the sampling of the sampler 3 is completed, the sampler 3 will be lifted away from the sample box 11, the second pressing rod 37 will be lifted away from the box cover 12, and the second torsion spring 121 will gradually return to the natural state, so that the box cover 12 is resealed to the sample box 11 to prevent the sample solution from being confused and disordered.

[0048] As shown in Figure 1 , Figure 3 and Figure 5As shown, the placing cavity 13 is provided with a cleaning unit 4, a drying unit 5, a pollution collecting unit 6 and a control unit 7, the cleaning unit 4 comprises a water tank 41 and a water pump 42, the water inlet end of the water pump 42 is communicated with the inside of the water tank 41, the water outlet end of the water pump 42 is communicated with the sampling cylinder 32 through a water pipe 43, a first one-way valve 44 is installed on the water pipe 43; the drying unit 5 comprises a hot air machine 51, the hot air machine 51 is communicated with the sampling cylinder 32 through an air pipe 52, a second one-way valve 53 is installed on the air pipe 52; the control unit 7 comprises 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 machine 51 are all coupled to the controller 71; the piston 35 is installed with a first pressing rod 36.

[0049] When the three-dimensional moving module 2 drives the sampler 3 after the sampling is completed to move to the directly above 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 to the test tube 14, and the piston 35 will drive the first pressing rod 36 to descend synchronously in the process of descending; when the sample solution in the sampler 3 is all discharged, the first pressing rod 36 will touch the contact sensor 72, the contact sensor 72 will emit a cleaning signal to the processor, and the processor will control the water pump 42 and the hot air machine 51 to be opened for a specified time in turn; the water pump 42 will draw the clean water in the water tank 41, the clean water will enter into the sampling cylinder 32 through the water pipe 43, realizing the flushing of the inside of the sampling cylinder 32 and the inside of the sampling needle 33; the hot air machine 51 will blow hot air into the sampling cylinder 32 through the air pipe 52, realizing the drying of the inside of the sampling cylinder 32 and the inside of the sampling needle 33, so that the sampler 3 can quickly sample next time, avoiding the confusion of the sample solution and improving the sampling efficiency when sampling multiple times.

[0050] It is worth mentioning that the first one-way valve 44 and the second one-way valve 53 are arranged, so that the air in the sampling cylinder 32 is not easy to enter into the air pipe 52 and the water pipe 43, so that the sampler 3 can suck the sample solution into the sampling cylinder 32.

[0051] As shown in the figure, Figures 5 to 8 The pollution collecting unit 6 comprises a clamping seat 61 and a water guide plate 63, the clamping seat 61 is connected to the base 1 through a horizontally arranged spring 62, the upper surface of the clamping seat 61 is provided with a first guide groove 611; the middle part of the water guide plate 63 is rotationally connected to the base 1 through a horizontal shaft 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 slidingly embedding the clamping seat 61, the other end of the water guide plate 63 is provided with a water guide cavity 633; the piston 35 is installed with the first pressing rod 36.

[0052] When the electric cylinder 34 drives the piston 35 to descend, the sample in the sampling cylinder 32 is pushed out into the test tube 14, the first pressing rod 36 is inserted into the first guide groove 611, and the first pressing rod 36 slides on the groove wall of the first guide groove 611, so that the clamping seat 61 slides away from the second guide groove 631, the spring 62 is gradually deformed, the first torsion spring 634 returns to the natural state and drives the water guide plate 63 to flip, the water guide cavity 633 flips directly below the sampler 3, and the clean water for cleaning the sampler 3 is discharged into the water guide cavity 633 after cleaning, so that the sewage is prevented from entering the test tube 14.

[0053] It is worth noting that the sewage box 15 is arranged on the base 1 and located on one side of the test tube 14, and the water guide cavity 633 directly below the sampler 3 can guide the sewage into the sewage box 15, so as to collect the sewage.

[0054] After the sampler 3 is cleaned and dried, the three-dimensional moving module 2 drives the sampler 3 to move, so that the first pressing rod 36 is separated from the clamping seat 61, the spring 62 returns to the natural state, the clamping seat 61 is inserted into the second guide groove 631, and the clamping seat 61 slides on the groove wall of the second guide groove 631, so that the water guide plate 63 flips until the water guide plate 63 is separated from directly above the test tube 14, so that the subsequent sampler 3 can directly inject the sample solution into the test tube 14, and at this time, the first torsion spring 634 is in a deformed state.

[0055] It is worth noting that the first guide groove 611 penetrates through the front and back of the clamping seat 61, the three-dimensional moving module 2 drives the sampler 3 to move horizontally, so that the first pressing rod 36 slides in the horizontal direction and is separated from the first guide groove 611.

[0056] The water guide plate 63 is provided with a storage shell 64, and the storage shell 64 is provided with a through hole 641. When the water guide cavity 633 flips directly below the sampler 3, the sampling needle 33 is located in the storage shell 64 and is 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 guide cavity 633; that is, the sewage and hot air discharged from the sampling needle 33 enter the storage shell 64, part of the sewage and part of the hot air directly pass through the through hole 641 and flow into the water guide cavity 633, and the other part of the sewage and the other part of the hot air overflow from the top opening of the storage shell 64, so that the cleaning and drying of the outside of the sampling needle 33 are realized.

[0057] The working principle of the present application is that: during the sample sampling process, the three-dimensional movement 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 movement module 2 drives the sampler 3 to descend, and the sampler 3 will press 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 descends and sinks into the sample box 11, at this time the electric cylinder 34 drives the piston 35 to rise, so that the sample solution enters the sampling cylinder 32 through the sampling needle 33.

[0058] After that, the three-dimensional movement module drives the sampler 3 to move to the top of the test tube 14, and the second torsional spring 121 gradually returns to the natural state, so that the box cover 12 is resealed on the sample box 11 to prevent the sample solution from being confused; the electric cylinder 34 drives the piston 35 to descend, so that the sample in the sampling cylinder 32 is pushed out into the test tube 14.

[0059] When the sample solution in the sampler 3 is completely discharged, the first pressure rod 36 will be inserted into the first guide groove 611 and abut against the contact sensor 72, the clamping seat 61 will slide away from the second guide groove 631, the first torsional spring 634 will return to the natural state and make the water guide plate 63 turn over, and the water guide cavity 633 will turn over 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 be turned on for a specified time; the water pump 42 will draw clean water in the water tank 41, and the clean water will enter the sampling cylinder 32 through the water pipe 43, realizing the flushing of the inside of the sampling cylinder 32 and the inside of the sampling needle 33, and the sewage after flushing will enter the storage shell 64 through the sampling needle 33 and clean the outside of the sampling needle 33, and the cleaned sewage 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 cylinder 32 through the air pipe 52, realizing the drying of the inside of the sampling cylinder 32 and the inside of the sampling needle 33, and then the hot air will enter the storage shell 64 through the sampling needle 33 and dry the outside of the sampling needle 33.

[0060] After that, the three-dimensional movement module 2 drives the sampler 3 to move to continue sampling, the first pressure rod 36 will be separated from the clamping seat 61, and the spring 62 will return to the natural state, so that the clamping seat 61 is inserted into the second guide groove 631, and the clamping seat 61 will slide on the groove wall of the second guide groove 631, so that the water guide plate 63 turns 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 sample solution into the test tube 14.

[0061] In summary, the 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 sample next time, avoiding confusion of sample solutions and improving sampling efficiency when sampling multiple times.

[0062] It should be noted that in the description of the present application, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0063] In addition, it should be further pointed out that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0064] The term "includes" or any other similar term is intended to cover non-exclusive inclusion, so that the process, article or equipment / device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes the elements inherent to the process, article or equipment / device.

[0065] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

Claims

1. A sampling device for liquid chromatography, comprising a base (1) and a three-dimensional moving module (2), a plurality of sample boxes (11) arranged in a net shape are placed on the base (1), a box cover (12) is arranged on the sample box (11), and a sampler (3) is arranged on the three-dimensional moving module (2), characterized in that, The base (1) is provided with a placing cavity (13) for placing a test tube (14), and a cleaning unit (4), a drying unit (5) and a sewage collecting unit (6) located at the placing cavity (13); The sampler (3) comprises a mounting seat (31) mounted on the three-dimensional moving module (2), a sampling cylinder (32) and an electric cylinder (34) mounted on the mounting seat (31), one end of the sampling cylinder (32) being communicated with a sampling needle (33), and a piston (35) being mounted on a piston rod of the electric cylinder (34), the piston (35) being slidingly embedded in the other end of the sampling cylinder (32); The cleaning unit (4) is communicated with the sampling cylinder (32) through a water pipe (43), and the cleaning unit (4) can feed water into the sampling cylinder (32) through the water pipe (43); The drying unit (5) is communicated with the sampling cylinder (32) through an air pipe (52), and the drying unit (5) can introduce hot air into the sampling cylinder through the air pipe (52); The sewage collecting unit (6) comprises a clamping seat (61) and a water guide plate (63), the clamping seat (61) being connected to the base (1) through a horizontally arranged spring (62), and the upper surface of the clamping seat (61) being provided with a first guide groove (611); the middle part of the water guide plate (63) is rotationally connected to the base (1) through a horizontal shaft (632) and connected to the base (1) through a first torsion spring (634), one end of the water guide plate (63) being provided with a second guide groove (631) for slidingly embedding the clamping seat (61), and the other end of the water guide plate (63) being provided with a water guide cavity (633); The piston (35) is mounted with a first pressing rod (36), when the electric cylinder (34) drives the piston (35) to descend, the sample in the sampling cylinder (32) is pushed out into the test tube (14), and then the first pressing rod (36) is inserted into the first guide groove (611), so that the clamping seat (61) is slidingly separated from the second guide groove (631), the spring (62) is in a deformed state, and the first torsion spring (634) returns to a natural state and makes the water guide cavity (633) turn over to be directly below the sampler (3); When the first pressing rod (36) is separated from the clamping seat (61), the spring (62) returns to a natural state, so that the clamping seat (61) is inserted into the second guide groove (631) and makes the water guide plate (63) turn over until the water guide plate (63) is separated from directly above the test tube (14), at this time, the first torsion spring (634) is in a deformed state; The base (1) is provided with a sewage box (15) located on one side of the test tube (14), and the water guide cavity (633) located directly below the sampler (3) can guide the sewage into the sewage box (15); The water guide plate (63) is mounted with a storage shell (64), and the storage shell (64) is provided with a through hole (641); When the water guide cavity (633) turns over to be directly below the sampler (3), the sampling needle (33) is located inside the storage shell (64) and is 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 guide cavity (633).

2. The sampling device for liquid chromatography according to claim 1, wherein The cleaning unit (4) comprises a water tank (41) and a water pump (42), the water inlet end of the water pump (42) is communicated with the inside of the water tank (41), the water outlet end of the water pump (42) is communicated with the sampling cylinder (32) through a water pipe (43), and the first one-way valve (44) is installed on the water pipe (43).

3. A sampling device for liquid chromatography according to claim 2, wherein The drying unit (5) comprises a hot air machine (51), the hot air machine (51) is communicated with the sampling cylinder (32) through an air pipe (52), and the second one-way valve (53) is installed on the air pipe (52).

4. The sampling device for liquid chromatography according to claim 3, wherein The control unit (7) comprises 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 machine (51) are coupled to the controller (71); When the electric cylinder (34) drives the piston (35) to descend, so that the sample in the sampling cylinder (32) is pushed out into the test tube (14), the first pressing rod (36) will be in contact with the contact sensor (72), 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 machine (51) to be opened for a specified time.

5. The sampling device for liquid chromatography according to claim 1, wherein The first guide groove (611) penetrates through the front and back of the clamping seat (61), and the first pressing rod (36) can slide away from the first guide groove (611) in the horizontal direction.

6. The sampling device for liquid chromatography according to claim 1, wherein The sample box (11) is provided with two box covers (12), the two box covers (12) are arranged in a double-door mode, and the middle part of the sample box (11) is rotatably connected to the sample box (11) and connected to the sample box (11) through the second torsional spring (121). When the second torsional spring (121) is in a natural state, the opposite ends of the two box covers (12) are jointly closed to the box opening of the sample box (11), and the opposite ends of the two box covers (12) are located outside the sample box (11).

7. A sampling device for liquid chromatography according to claim 6, wherein The sampler (3) is provided with two second pressing rods (37), before the sampler (3) descends into the sample box (11), the sampler (3) will press the corresponding box cover (12) through the two second pressing rods (37), and the opposite ends of the two box covers (12) will be turned down, so that the box opening of the sample box (11) is exposed.

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