A gas chromatograph injection device and a gas chromatograph

Abstract

The application discloses a gas chromatograph sampling device and a gas chromatograph, and relates to the technical field of gas chromatographs. The gas chromatograph sampling device comprises a support frame, a main lifting device fixedly installed on the support frame, a support column fixedly connected to the telescopic end of the main lifting device, a rotating disc rotatably installed on the outer wall of the support column, three groups of injectors rotatably installed on the rotating disc, a switching component provided on the support column and used for driving the rotating disc to rotate, a sample disc rotatably installed on the support frame through a first vertical shaft, a disc rotatably installed on the support frame through a second vertical shaft, and a plurality of circular holes circumferentially distributed on the disc. The application can realize the turn-by-turn sampling of multiple samples quickly, significantly improves the sampling and detection efficiency of the samples, and ensures the detection efficiency and accuracy of the samples since the rubber pad used each time is replaced during the detection process.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gas chromatograph, in particular to a gas chromatograph sampling device. BACKGROUND

[0002] The gas chromatograph is a high-efficiency separation and analysis instrument, mainly used for qualitative and quantitative analysis of volatile or semi-volatile mixtures. Its core principle is to use the distribution difference between the components in the sample and the mobile phase (carrier gas, such as nitrogen, helium) and the stationary phase (coating in the chromatographic column) to realize separation through temperature rising or constant temperature program, and convert into electrical signals through the detector (such as FID, TCD, MS, etc.) to output chromatogram. It has the characteristics of high resolution, high sensitivity, rapid analysis and wide application (such as environmental monitoring, food safety, petroleum chemical industry, etc.), and is an important tool for modern analytical chemistry.

[0003] In the use of the gas chromatograph, it is found that the workers need to frequently replace the syringes used for sampling, and need to frequently use the syringes to extract different specifications of detection samples, so as to detect different samples, the operation process is relatively cumbersome, and it is not conducive to the workers to efficiently complete the detection work. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art, and to provide a gas chromatograph sampling device which can overcome the above problems or at least partially solve the above problems.

[0005] To solve the above technical problems, the basic idea of the technical scheme adopted by the present application is:

[0006] A gas chromatograph sampling device, comprising a support frame, further comprising: a main lifting device fixedly installed on the support frame, wherein the telescopic end of the main lifting device is fixedly connected with a support column, the outer wall of the support column is rotatably installed with a turntable, three groups of circumferentially distributed syringes are rotatably installed on the turntable, and a switching component for driving the rotation of the turntable is arranged on the support column; a sample disc is rotatably installed on the support frame through a first vertical shaft, wherein a disc is rotatably installed on the support frame through a second vertical shaft, a plurality of circumferentially distributed circular holes are formed in the disc, a rubber pad is fixedly arranged in each of the circular holes, a rubber tube is fixedly connected to the top of the rubber pad, and an exchange part for driving the rotation of the first vertical shaft and the second vertical shaft is arranged on the support frame.

[0007] Preferably, the switching component comprises an upper driving motor fixedly installed on the support column, an upper driving gear is fixedly installed on the output shaft of the upper driving motor and the turntable, and the two upper driving gears are meshed and connected.

[0008] Preferably, the switching part comprises a lower driving motor fixedly installed on the support frame, an output shaft of the lower driving motor is fixedly installed with a lower transmission gear, two lower transmission gears are in meshing connection, the first vertical shaft and the second vertical shaft are connected through a chain transmission assembly.

[0009] Preferably, an inner pipeline is arranged in the push rod of the injector, a liquid injection hole in communication with the inner pipeline is arranged at the bottom edge of the piston of the injector, an annular pipe is fixedly connected to the lower end of the injector, a nozzle is fixedly installed at the lower end of the annular pipe and faces the bottom needle of the injector, the annular pipe is in communication with the inner pipeline through a first connecting pipe, an electromagnetic valve is fixedly installed in the input end of the inner pipeline, and a vice lifting device for pushing the push rod is fixedly installed on the rotating disc.

[0010] Further, a main inner pipe is fixedly arranged at the bottom of the support column, a circular ring is rotatably installed on the outer wall of the support column, three side holes are arranged on the outer wall of the circular ring in circumferential distribution, three inner pipelines are in communication with the three side holes through three second connecting pipes, a communication hole aligned with one of the side holes is arranged at the top of the main inner pipe, and a main pipeline is fixedly connected to the lower end of the main inner pipe.

[0011] Still further, a liquid storage tank and a gas storage tank are fixedly installed on the support frame, branch pipes in communication with the main pipeline are fixedly connected to the liquid storage tank and the gas storage tank, and an electromagnetic valve is fixedly installed in each of the two branch pipes.

[0012] Preferably, three circumferentially distributed worms are rotatably installed at the bottom of the rotating disc, three worm gears fixedly connected with the three worms in meshing connection are fixedly connected to the outer wall of the three injectors, a driven gear is fixedly installed at the shaft end of each of the three worms, and a rack fixedly connected with the support frame is arranged above the disc.

[0013] Further, the shaft end face of the injector is polygonal, an outer pipe fixedly connected with the rotating disc is arranged around the outer wall of the injector, and a knocking block is connected to the inner wall of the outer pipe through an elastic member.

[0014] Still further, a recovery box is fixedly connected to the support frame, a recovery pipe is fixedly connected to the top of the recovery box, and the recovery pipe, the sample disc and the disc are respectively located below the three injectors.

[0015] A gas chromatograph comprises a gas chromatograph body, a support frame fixedly installed at the top of the gas chromatograph body, and a sample inlet arranged at the top of the gas chromatograph body, wherein the disc is fixedly connected to the top of the support frame, the lower end of the disc is attached to the annular supporting plate, and the upper end of the sample inlet is aligned with one of the circular holes.

[0016] Compared with the prior art, the present application has the following beneficial effects:

[0017] 1. By starting the upper driving motor, the rotating disc can drive the three injectors to revolve around the support column, so that the sample-filled injectors are moved to the sample inlet, the injectors after injection are moved above the recovery pipe, and the cleaned injectors are moved above the sample disc, and the above process is repeated to realize the rotation of multiple samples, thereby improving the sample loading and detection efficiency.

[0018] 2. By starting the lower driving motor, the first vertical shaft and the second vertical shaft drive the sample disc and the disc to rotate synchronously, and when the sample bottle and the rubber pad on the sample disc are exchanged, the lower driving motor is turned off to quickly complete the exchange of the sample bottle and the rubber pad, so that the rubber pad used in the detection process is replaced, thereby ensuring the detection efficiency and accuracy of the sample.

[0019] 3. By opening the electromagnetic valve in the branch pipe connected to the liquid storage tank, the spray hole sprays cleaning liquid into the injector to clean the inner wall of the injector, and part of the cleaning liquid enters the needle and is discharged from the bottom of the needle, and the nozzle sprays cleaning liquid to the outer wall of the needle to clean the outer wall of the needle, so that the injector is automatically cleaned from the inside to the outside, thereby ensuring the detection accuracy.

[0020] 4. The downwardly moving rotating disc drives the driven gear to scan the rack, the worm gear drives the injector to rotate, and the injector drives the needle to rotate and insert into the rubber tube and the rubber pad, thereby reducing the resistance of the needle and prolonging the service life of the needle.

[0021] 5. When the polygonal injector rotates, the edges of the outer wall knock the knocking block in the outer tube, the injector vibrates, the gas bubbles at the bottom of the injector are loosened, the gas bubbles escape to the top of the injector, the influence of the gas bubbles on the sample injection and subsequent detection is reduced, and the sealing of the needle by the rubber tube improves the detection accuracy.

[0022] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0023] In the drawings:

[0024] Figure 1 A three-dimensional structure of a gas chromatography sampling device and a gas chromatograph is provided. Figure 1 ;

[0025] Figure 2A gas chromatography injection device and a gas chromatography instrument are provided Figure 2 ;

[0026] Figure 3 A gas chromatography injection device is provided

[0027] Figure 4 A gas chromatography injection device is provided Figure 1 ;

[0028] Figure 2 A gas chromatography injection device is provided Figure 6 ;

[0029] Figure 7 A gas chromatography injection device is provided

[0030] Figure 8 A gas chromatography injection device is provided

[0031] Figure 9 A gas chromatography injection device is provided

[0032] Figure 10 A gas chromatography injection device is provided

[0033] Figures 1-10 A gas chromatography injection device is provided

[0034] In the figure: 1, support frame; 2, main lifting device; 3, support column; 4, rotating disc; 5, syringe; 6, needle; 7, auxiliary lifting device; 8, piston; 9, push rod; 10, sample disc; 11, first vertical shaft; 12, second vertical shaft; 13, chain transmission assembly; 14, lower drive motor; 15, lower transmission gear; 16, disc; 17, rubber tube; 18, rubber pad; 19, annular ring; 20, inner pipeline; 21, liquid injection hole; 22, annular tube; 23, nozzle; 24, first connecting tube; 25, main inner tube; 26, communication hole; 27, circular ring; 28, side hole; 29, second connecting tube; 30, outer tube; 31, elastic member; 32, knocking block; 33, liquid storage tank; 34, gas storage tank; 35, main pipeline; 36, branch pipe; 37, recovery box; 38, recovery pipe; 39, gas chromatography instrument body; 40, sample inlet; 41, annular supporting plate; 42, worm; 43, worm wheel; 44, driven gear; 45, rack; 46, upper drive motor; 47, upper transmission gear; 48, circular hole. DETAILED DESCRIPTION

[0035] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The following embodiments are used to explain the present application but not to limit the scope of the present application.

[0036] Embodiment 1: Refer to Figures 1-9 A gas chromatography sampling device, comprising a support frame 1, further comprising: a main lifting device 2 fixedly installed on the support frame 1, wherein the telescopic end of the main lifting device 2 is fixedly connected with a support column 3, the outer wall of the support column 3 is rotatably installed with a rotating disc 4, and three groups of circumferentially distributed injectors 5 are rotatably installed on the rotating disc 4, the injector 5 is mainly composed of a needle 6, a push rod 9, a piston 8 and a needle tube, the support column 3 is provided with a switching component for driving the rotating disc 4 to rotate, the switching component comprises an upper driving motor 46 fixedly installed on the support column 3, and the output shaft of the upper driving motor 46 is fixedly installed with an upper transmission gear 47 on the rotating disc 4, and the two upper transmission gears 47 are meshed and connected; a sample disc 10 is rotatably installed on the support frame 1 through a first vertical shaft 11, wherein the support frame 1 is rotatably installed with a disc 16 through a second vertical shaft 12, a plurality of circular holes 48 are formed circumferentially on the disc 16, and a plurality of rubber pads 18 are fixedly installed in the plurality of circular holes 48, the rubber pad 18 is used to improve the sealing performance of the sample inlet 40 of the gas chromatograph body 39, in use, the needle 6 needs to pass through the rubber pad 18, the top of the rubber pad 18 is fixedly connected with a rubber tube 17, and the support frame 1 is provided with a switching part for driving the first vertical shaft 11 and the second vertical shaft 12 to rotate, the switching part comprises a lower driving motor 14 fixedly installed on the support frame 1, the output shaft of the lower driving motor 14 is fixedly installed with a lower transmission gear 15 on the outer wall of the second vertical shaft 12, and the two lower transmission gears 15 are meshed and connected, the first vertical shaft 11 and the second vertical shaft 12 are connected through a chain transmission assembly 13, the chain transmission assembly 13 is mainly composed of two chain wheels and a chain, in actual use, the three injectors 5 are respectively located in three stations, which are respectively a sampling station, a flushing station and a sampling station.

[0037] Specifically, the bottle body containing the sample is placed circumferentially on the sample disc 10, and a plurality of rubber pads 18 are placed in the plurality of circular holes 48 of the disc 16, then the rotating disc 4 and the three injectors 5 are driven by the main lifting device 2 to move downward synchronously, the needle 6 of one of the injectors 5 is inserted into one of the sample bottles, the needle 6 of one of the injectors 5 is inserted into one of the rubber tubes 17 and the rubber pads 18, and the needle 6 of the other injector 5 is inserted into the recovery pipe 38, so that the three injectors 5 can simultaneously complete sampling, sampling and flushing work respectively, thereby improving the detection efficiency of the sample.

[0038] When the syringes 5 need to draw or discharge the internal liquid, the push rod 9 and the piston 8 are driven by the auxiliary lifting device 7 to move upward or downward in the syringes 5, when the piston 8 moves upward, the syringes 5 draw the sample through the needle 6, and conversely, when the piston 8 moves downward, the sample in the syringes 5 is discharged into the sample inlet 40 of the gas chromatograph body 39.

[0039] The support frame 1 is fixedly connected with a recovery tank 37, the top of the recovery tank 37 is fixedly connected with a recovery pipe 38, the recovery pipe 38, the sample disc 10 and the disc 16 are respectively located below the three syringes 5, and the recovery tank 37 recovers the waste liquid generated by cleaning the syringes 5 through the recovery pipe 38.

[0040] When the three groups of syringes 5 complete the sampling, sampling and flushing work respectively, the disc 4 and the syringes 5 are driven by the main lifting device 2 to move upward, and then the upper driving motor 46 is started, the disc 4 is driven by the two upper transmission gears 47 to rotate, and the disc 4 drives the three syringes 5 to revolve around the support column 3, until the three syringes 5 are exchanged with each other, the upper driving motor 46 is closed, then the syringe 5 after sampling moves to the sample inlet 40, the syringe 5 after injection is moved above the recovery pipe 38, and the syringe 5 after cleaning is moved above the sample disc 10, and then the above process is completed again, that is, the sample can be quickly injected in turn, and the sample injection and detection efficiency is improved.

[0041] When the upper driving motor 46 is started, the lower driving motor 14 is started at the same time, the second vertical shaft 12 is driven by the two lower transmission gears 15 to rotate, the first vertical shaft 11 is driven by the chain transmission assembly 13 to rotate synchronously, and the sample disc 10 and the disc 16 are driven by the first vertical shaft 11 and the second vertical shaft 12 to rotate synchronously, when the sample bottle on the sample disc 10 and the rubber pad 18 are exchanged at the same time, the lower driving motor 14 is closed, the replacement of the sample bottle and the rubber pad 18 is quickly completed, and the rubber pad 18 used in the detection process is replaced every time, so that the detection efficiency and accuracy of the sample are ensured.

[0042] In practice, a plurality of annular rings 19 are fixedly arranged on the inner wall of the rubber tube 17, and the plurality of annular rings 19 can further improve the sealing performance of the rubber tube 17 to the needle 6.

[0043] Embodiment 2: refer to Figures 4-8 A gas chromatography sampling device, which is basically the same as embodiment 1, and further comprises:

[0044] The push rod 9 of the injector 5 is provided with an inner pipeline 20, the bottom edge of the piston 8 of the injector 5 is provided with a liquid injection hole 21 in communication with the inner pipeline 20, the lower end of the injector 5 is fixedly connected with an annular pipe 22, the lower end of the annular pipe 22 is fixedly installed with a nozzle 23 facing the bottom needle 6 of the injector 5, the annular pipe 22 is in communication with the inner pipeline 20 through a first connecting pipe 24, the input end of the inner pipeline 20 is fixedly installed with an electromagnetic valve, the vice lifting device 7 for pushing the push rod 9 is fixedly installed on the rotating disc 4, and the main lifting device 2 and the vice lifting device 7 are both electric telescopic rods; the bottom of the support column 3 is fixedly provided with a main inner pipe 25, the outer wall of the support column 3 is rotatably installed with a circular ring 27, the outer wall of the circular ring 27 is provided with three side holes 28 distributed in a circle, three inner pipelines 20 are in communication with the three side holes 28 through three second connecting pipes 29 respectively, the top of the main inner pipe 25 is provided with a communication hole 26 aligned with one of the side holes 28, the lower end of the main inner pipe 25 is fixedly connected with a main pipeline 35, and the supporting frame 1 is fixedly installed with a liquid storage tank 33 and a gas storage tank 34, the liquid storage tank 33 and the gas storage tank 34 are both fixedly connected with branch pipes 36 in communication with the main pipeline 35, and the branch pipes 36 are both fixedly installed with electromagnetic valves.

[0045] Specifically, when the injector 5 moves to the cleaning station, the corresponding side hole 28 will be aligned with the communication hole 26, at this time, the electromagnetic valve in the branch pipe 36 communicating with the liquid storage tank 33 is opened, the cleaning liquid in the liquid storage tank 33 will enter the main pipeline 35 through the branch pipe 36, then enter the main inner pipe 25, and then enter the side hole 28 through the communication hole 26, and then enter the inner pipeline 20 and the first connecting pipe 24 and the annular pipe 22 through the second connecting pipe 29, at this time, the liquid injection hole 21 will spray the cleaning liquid into the injector 5, so as to complete the cleaning work of the inner wall of the injector 5, and part of the cleaning liquid will enter the needle 6 and be discharged from the bottom of the needle 6, and the nozzle 23 will spray the cleaning liquid to the outer wall of the needle 6, so as to complete the cleaning work of the outer wall of the needle 6, so that the cleaning work of the injector 5 from inside to outside can be automatically completed, and the subsequent detection accuracy is ensured, and in order to completely discharge the cleaning liquid in the injector 5, the piston 8 can be pressed downward, then the electromagnetic valve in the current branch pipe 36 is closed, and the electromagnetic valve in the other branch pipe 36 is opened, so that the inert gas in the gas storage tank 34 is discharged from the liquid injection hole 21 and the nozzle 23, so as to complete the air drying work of the inside and outside of the injector 5, and prevent the residual cleaning liquid from affecting the subsequent accuracy.

[0046] Embodiment 3: refer to Figures 1-3 , a gas chromatography sampling device, which is basically the same as embodiment 2, and is further provided with:

[0047] The bottom of the rotating disc 4 is rotatably provided with three circumferentially distributed worms 42, the outer wall of each of the three injectors 5 is fixedly connected with a worm wheel 43 which is in meshing connection with the three worms 42, the shaft end of each of the three worms 42 is fixedly provided with a driven gear 44, and a rack 45 which is fixedly connected with the support frame 1 is arranged above the disc 16.

[0048] Specifically, when the injector 5 moves to the sample inlet 40 and moves downward, the rotating disc 4 will drive the driven gear 44 to sweep the rack 45, the rack 45 will drive the driven gear 44 to rotate, the driven gear 44 will drive the worm wheel 43 to rotate through the worm 42, the worm wheel 43 will drive the injector 5 to rotate, and the injector 5 will drive the needle 6 to rotate and insert into the rubber tube 17 and the rubber pad 18, thereby reducing the resistance of the needle 6 and prolonging the service life of the needle 6.

[0049] The shaft end surface of the injector 5 is polygonal, the outer wall of the injector 5 is surrounded by an outer tube 30 which is fixedly connected with the rotating disc 4, and the inner wall of the outer tube 30 is connected with a knocking block 32 through an elastic member 31.

[0050] Specifically, when the polygonal injector 5 rotates, the edges of the outer wall will knock the knocking block 32 in the outer tube 30, and the injector 5 will vibrate, so that the bubbles in the bottom of the injector 5 are loosened and escape to the top of the injector 5, thereby reducing the influence of the bubbles on sampling and subsequent detection. The arrangement of the rubber tube 17 can improve the sealing performance of the rubber pad 18 to the needle 6, so that the detection accuracy is higher.

[0051] Embodiment 4: refer to Figure 6 , Figure 10 and ​ : A gas chromatograph comprises a gas chromatograph body 39 for detecting a liquid, the top of the gas chromatograph body 39 is provided with a sample inlet 40 for injecting a liquid sample, a support frame 1 is fixedly installed on the top of the gas chromatograph body 39, the top of the sample inlet 40 is fixedly connected with an annular supporting plate 41, the lower end of a disc 16 is attached to the annular supporting plate 41, and the upper end of the sample inlet 40 is aligned with one of the circular holes 48.

[0052] Specifically, when the disc 16 rotates, the lower end surface of the disc 16 will always be attached to the annular supporting plate 41, so that the sealing performance between the two can be guaranteed.

[0053] In use, the bottle body loaded with sample is placed on the sample disc 10 in a circumferential distribution, the plurality of rubber pads 18 are placed in the plurality of round holes 48 of the disc 16, and then the turntable 4 and the three injectors 5 are synchronously moved downward by the main lifting device 2, the needle 6 of one of the injectors 5 is inserted into one of the sample bottles, the needle 6 of one of the injectors 5 is inserted into one of the rubber tubes 17 and the rubber pad 18, and the needle 6 of the other injector 5 is inserted into the recovery tube 38, so that the three injectors 5 can simultaneously complete the sample injection, sampling and flushing, thereby improving the sample detection efficiency.

[0054] When the injector 5 needs to extract or discharge the liquid in the interior, the push rod 9 and the piston 8 are moved upward or downward in the injector 5 by the auxiliary lifting device 7, when the piston 8 moves upward, the injector 5 sucks the sample through the needle 6, and conversely, when the piston 8 moves downward, the sample in the injector 5 is discharged into the sample inlet 40 of the gas chromatograph body 39.

[0055] When the three groups of injectors 5 complete the sample injection, sampling and flushing, the turntable 4 and the injectors 5 are moved upward by the main lifting device 2, and then the upper driving motor 46 is started, the upper driving motor 46 drives the turntable 4 to rotate through the two upper transmission gears 47 engaged with each other, the turntable 4 drives the three injectors 5 to revolve around the support 3, until the three injectors 5 are exchanged with each other, the upper driving motor 46 is closed, so that the injector 5 after sampling moves to the sample inlet 40, the injector 5 after injection moves above the recovery tube 38, and the injector 5 after cleaning moves above the sample disc 10, and then the above process is completed again, so that the sample injection is realized quickly, and the sample detection efficiency is improved.

[0056] When the upper driving motor 46 is started, the lower driving motor 14 is also started, the lower driving motor 14 drives the second vertical shaft 12 to rotate through the two lower transmission gears 15 engaged with each other, the second vertical shaft 12 drives the first vertical shaft 11 to rotate synchronously through the chain transmission assembly 13, and the first vertical shaft 11 and the second vertical shaft 12 drive the sample disc 10 and the disc 16 to rotate synchronously, when the sample bottles and the rubber pads 18 on the sample disc 10 are exchanged with each other, the lower driving motor 14 is closed, so that the replacement of the sample bottles and the rubber pads 18 is completed quickly, and the rubber pads 18 used each time in the detection process are replaced, so that the sample detection efficiency and accuracy are ensured.

[0057] When the syringe 5 moves to the cleaning station, the side hole 28 corresponding to it is aligned with the communication hole 26, at this time, the electromagnetic valve in the branch pipe 36 communicating with the liquid storage tank 33 is opened, the cleaning liquid in the liquid storage tank 33 enters the main pipe 35 through the branch pipe 36, then enters the main inner pipe 25, and then enters the side hole 28 through the communication hole 26, and then enters the inner pipe 20, the first connecting pipe 24 and the annular pipe 22 through the second connecting pipe 29, at this time, the spray hole 21 sprays the cleaning liquid into the syringe 5, thereby completing the cleaning work of the inner wall of the syringe 5, and part of the cleaning liquid enters the needle 6 and is discharged from the bottom of the needle 6, and the nozzle 23 sprays the cleaning liquid to the outer wall of the needle 6, thereby completing the cleaning work of the outer wall of the needle 6, so that the cleaning work of the syringe 5 from the inside to the outside can be automatically completed, in order to completely discharge the cleaning liquid in the syringe 5, the piston 8 can be pressed downward, then the electromagnetic valve in the current branch pipe 36 is closed, and the electromagnetic valve in another branch pipe 36 is opened, so that the inert gas in the gas storage tank 34 is discharged from the spray hole 21 and the nozzle 23, thereby completing the air drying work of the inside and outside of the syringe 5, preventing the residual cleaning liquid from affecting the subsequent accuracy.

[0058] The above only describes the preferred embodiments of the present application, and does not limit the present application in any form. Although the present application has been described above with the preferred embodiments, it is not intended to limit the present application, any skilled person in the art can make some changes or modifications to the above-mentioned technical content without departing from the technical solution of the present application, and the equivalent embodiments with equivalent changes are considered equivalent embodiments. Any simple modification, equivalent change and modification of the above embodiments made according to the technical essence of the present application are still within the protection scope of the present application.

Claims

1. A gas chromatography sampling device comprising a support frame (1), characterized in that, Also include: The main lifting device (2) is fixedly installed on the support frame (1), Wherein, the telescopic end of the main lifting device (2) is fixedly connected with a support column (3), the outer wall of the support column (3) is rotatably installed with a rotating disc (4), three groups of circumferentially distributed syringes (5) are rotatably installed on the rotating disc (4), and a switching component for driving the rotating disc (4) to rotate is arranged on the support column (3); The sample disc (10) is rotatably installed on the support frame (1) through a first vertical shaft (11), Wherein, the support frame (1) is rotatably installed with a disc (16) through a second vertical shaft (12), a plurality of circumferentially distributed round holes (48) are formed in the disc (16), a plurality of rubber pads (18) are fixedly arranged in the plurality of round holes (48), the top of each rubber pad (18) is fixedly connected with a rubber tube (17), and an exchange part for driving the first vertical shaft (11) and the second vertical shaft (12) to rotate is arranged on the support frame (1); The inner pipe (20) is arranged in the push rod (9) of the syringe (5), the bottom edge of the piston (8) of the syringe (5) is provided with a liquid injection hole (21) in communication with the inner pipe (20), the lower end of the syringe (5) is fixedly connected with an annular tube (22), the lower end of the annular tube (22) is fixedly installed with a nozzle (23) facing the bottom needle (6) of the syringe (5), the annular tube (22) is connected with the inner pipe (20) through a first connecting pipe (24), an electromagnetic valve is fixedly installed in the input end of the inner pipe (20), and a vice lifting device (7) for pushing the push rod (9) is fixedly installed on the rotating disc (4); The bottom of the support column (3) is fixedly provided with a main inner pipe (25), the outer wall of the support column (3) is rotatably installed with a circular ring (27), the outer wall of the circular ring (27) is provided with three circumferentially distributed side holes (28), three inner pipes (20) are respectively connected with the three side holes (28) through three second connecting pipes (29), the top of the main inner pipe (25) is provided with a communication hole (26) aligned with one of the side holes (28), and the lower end of the main inner pipe (25) is fixedly connected with a main pipeline (35). The support frame (1) is fixedly installed with a liquid storage tank (33) and a gas storage tank (34), the liquid storage tank (33) and the gas storage tank (34) are fixedly connected with branch pipes (36) in communication with the main pipeline (35), and an electromagnetic valve is fixedly installed in each of the two branch pipes (36).

2. A gas chromatography sampling device according to claim 1, wherein The switching component includes an upper driving motor (46) fixedly installed on the support column (3), an upper driving gear (47) is fixedly installed on the output shaft of the upper driving motor (46) and the rotating disc (4), and the two upper driving gears (47) are meshed and connected.

3. A gas chromatography sampling device according to claim 1, wherein The adjusting part includes a lower driving motor (14) fixedly installed on the support frame (1), the output shaft of the lower driving motor (14) is fixedly installed with a lower transmission gear (15) on the outer wall of the second vertical shaft (12), the two lower transmission gears (15) are in meshing connection, and the first vertical shaft (11) and the second vertical shaft (12) are connected through a chain transmission assembly (13).

4. A gas chromatography sampling device according to claim 1, wherein The bottom of the rotating disc (4) is rotatably installed with three circumferentially distributed worms (42), the outer wall of each of the three injectors (5) is fixedly connected with a worm wheel (43) in meshing connection with the three worms (42), the shaft end of each of the three worms (42) is fixedly installed with a driven gear (44), and a rack (45) fixedly connected with the support frame (1) is arranged above the disc (16).

5. A gas chromatography sampling device according to claim 4, wherein The shaft end face of the injector (5) is polygonal, the outer wall of the injector (5) is surrounded by an outer tube (30) fixedly connected with the rotating disc (4), and the inner wall of the outer tube (30) is connected with a knocking block (32) through an elastic element (31).

6. A gas chromatography sampling device according to claim 1, wherein The support frame (1) is fixedly connected with a recovery box (37), the top of the recovery box (37) is fixedly connected with a recovery pipe (38), and the recovery pipe (38), the sample disc (10) and the disc (16) are located below the three injectors (5) respectively.

7. A gas chromatograph comprising a gas chromatograph sample introduction device according to any one of claims 1 to 6, further comprising a gas chromatograph body (39), the top of the gas chromatograph body (39) being provided with a sample inlet (40), characterized in that, The support frame (1) is fixedly installed on the top of the gas chromatograph body (39), the top of the sample inlet (40) is fixedly connected with an annular supporting plate (41), the lower end of the disc (16) is attached to the annular supporting plate (41), and the upper end of the sample inlet (40) is aligned with one of the circular holes (48).

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