Gas chromatography sampling device and gas chromatograph

Abstract

The invention discloses a gas chromatography sampling device and a gas chromatograph, and relates to the technical field of gas chromatographs. The gas chromatography sampling device comprises a supporting frame and further comprises a main lifting device which is fixedly installed on the supporting frame, the telescopic end of the main lifting device is fixedly connected with a supporting column, a rotating disc is rotatably installed on the outer wall of the supporting column, three sets of syringes which are distributed circumferentially are rotatably installed on the rotating disc, and the three sets of syringes are connected with the main lifting device. A switching part for driving the turntable to rotate is arranged on the supporting column; the sample disc is rotationally mounted on the supporting frame through a first vertical shaft, a disc is rotationally mounted on the supporting frame through a second vertical shaft, and a plurality of circular holes are circumferentially distributed in the disc; by means of the sample feeding device, alternate sample feeding work of a plurality of samples can be rapidly achieved, the sample feeding and detecting efficiency of the samples is remarkably improved, the rubber pads used each time in the detecting process can be replaced, and the detecting efficiency and accuracy of the samples are guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of gas chromatography technology, specifically, it relates to a gas chromatography injection device. Background Technology

[0002] Gas chromatography (GC) is a highly efficient separation and analysis instrument primarily used for the qualitative and quantitative analysis of volatile or semi-volatile mixtures. Its core principle is based on the distribution differences between the components in a sample between the mobile phase (carrier gas, such as nitrogen or helium) and the stationary phase (column coating). Separation is achieved through temperature ramping or isothermal programming, and the resulting signals are converted into electrical signals by detectors (such as FID, TCD, and MS) to output a chromatogram. It features high resolution, high sensitivity, rapid analysis, and wide applications (such as environmental monitoring, food safety, and petrochemicals), making it an important tool in modern analytical chemistry.

[0003] During the use of gas chromatographs, it was found that staff need to frequently change the syringes used for sample injection and frequently use the syringes to draw samples of different specifications in order to test different samples. The operation process is cumbersome and not conducive to staff completing the testing work efficiently. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a gas chromatography injection device that can overcome the above problems or at least partially solve the above problems.

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: A gas chromatography injection device includes a support frame and further includes: a main lifting device fixedly mounted on the support frame, wherein a support column is fixedly connected to the telescopic end of the main lifting device, a turntable is rotatably mounted on the outer wall of the support column, three sets of circumferentially distributed syringes are rotatably mounted on the turntable, and a switching component for driving the turntable to rotate is provided on the support column; a sample tray rotatably mounted on the support frame via a first vertical axis, wherein a disc is rotatably mounted on the support frame via a second vertical axis, the disc has multiple circumferentially distributed circular holes, each of the multiple circular holes is fixedly fitted with a rubber pad, a rubber tube is fixedly connected to the top of the rubber pad, and an switching part for driving the first vertical axis and the second vertical axis to rotate is provided on the support frame.

[0006] Preferably, the switching component includes an upper drive motor fixedly mounted on the support column, and upper transmission gears are fixedly mounted on both the output shaft of the upper drive motor and the turntable, with the two upper transmission gears meshing with each other.

[0007] Preferably, the switching part includes a lower drive motor fixedly mounted on the support frame. The output shaft of the lower drive motor and the outer wall of the second vertical shaft are both fixedly mounted with lower transmission gears. The two lower transmission gears are meshed and connected. The first vertical shaft and the second vertical shaft are connected by a chain drive assembly.

[0008] Preferably, the syringe plunger has an inner tube, the bottom edge of the syringe piston has a spray hole communicating with the inner tube, the lower end of the syringe is fixedly connected to an annular tube, the lower end of the annular tube is fixedly installed with a nozzle facing the needle at the bottom of the syringe, the annular tube is connected to the inner tube through a first connecting tube, the input end of the inner tube is fixedly installed with a solenoid valve, and the turntable is fixedly installed with a secondary lifting device for pushing the plunger.

[0009] Furthermore, a main inner tube is fixedly installed at the bottom of the support column, and a ring is rotatably installed on the outer wall of the support column. The outer wall of the ring is provided with three side holes distributed circumferentially. The three inner tubes are connected to the three side holes respectively through three second connecting pipes. The top of the main inner tube is provided with a connecting hole aligned with one of the side holes, and the lower end of the main inner tube is fixedly connected to a main pipe.

[0010] Furthermore, a liquid storage tank and a gas storage tank are fixedly installed on the support frame. Each of the liquid storage tank and the gas storage tank is fixedly connected to a branch pipe that communicates with the main pipeline, and a solenoid valve is fixedly installed in each of the two branch pipes.

[0011] Preferably, three circumferentially distributed worm gears are rotatably mounted on the bottom of the turntable, and worm wheels that mesh with the three worm gears are fixedly connected to the outer walls of the three syringes respectively. Driven gears are fixedly mounted on the shaft ends of the three worm gears, and a rack that is fixedly connected to the support frame is provided above the turntable.

[0012] Furthermore, the end face of the syringe is polygonal in shape, the outer wall of the syringe is surrounded by an outer tube that is fixedly connected to the turntable, and the inner wall of the outer tube is connected to a striking block by an elastic element.

[0013] Furthermore, a recovery box is fixedly connected to the support frame, and a recovery tube is fixedly connected to the top of the recovery box. The recovery tube, sample tray, and disc are located below the three syringes, respectively.

[0014] A gas chromatograph includes a gas chromatograph body, an injection port on the top of the gas chromatograph body, a support frame fixedly installed on the top of the gas chromatograph body, an annular support plate fixedly connected to the top of the injection port, a disc with its lower end attached to the annular support plate, and the upper port of the injection port aligned with one of the circular holes.

[0015] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: 1. By starting the upper drive motor, the turntable can drive three syringes to revolve around the support column. The syringe after sampling will move to the sample inlet, the syringe after injection will move to the top of the recovery tube, and the syringe after cleaning will move to the top of the sample tray. Then the above process is repeated, which can quickly realize the sequential injection of multiple samples, significantly improving the sample loading and detection efficiency.

[0016] 2. By starting the lower drive motor, the first and second vertical shafts simultaneously drive the sample tray and the disc to rotate synchronously. When the sample bottle and the rubber pad on the sample tray are switched at the same time, the lower drive motor is turned off, which can quickly complete the replacement of the sample bottle and the rubber pad. Thus, the rubber pad is replaced every time it is used in the detection process, ensuring the efficiency and accuracy of sample detection.

[0017] 3. This invention opens the solenoid valve in the branch pipe connected to the storage tank. At this time, the spray nozzle sprays the cleaning fluid into the syringe, thereby completing the cleaning of the inner wall of the syringe. Some of the cleaning fluid enters the needle and is discharged from the bottom of the needle. The nozzle sprays the cleaning fluid onto the outer wall of the needle, thereby completing the cleaning of the outer wall of the needle. Thus, the syringe can be automatically cleaned from the inside out, ensuring the accuracy of subsequent testing.

[0018] 4. In this invention, the downward-moving turntable drives the driven gear to sweep across the rack, and the worm gear drives the syringe to rotate. The syringe then drives the needle to rotate and insert into the rubber tube and rubber pad, thereby reducing the resistance to the needle and extending its service life.

[0019] 5. When the polygonal syringe is rotated, the edges of the outer wall strike the striking block inside the outer tube, causing the syringe to vibrate. This loosens the air bubbles at the bottom of the syringe, allowing them to escape to the top of the syringe, reducing the impact of air bubbles on sample injection and subsequent detection. The rubber tube also improves the sealing of the needle by the rubber pad, resulting in higher detection accuracy.

[0020] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0021] In the attached diagram: Figure 1 This is a three-dimensional structural diagram of a gas chromatography injection device and a gas chromatograph proposed in this invention. Figure 1 ; Figure 2 This is a three-dimensional structural diagram of a gas chromatography injection device and a gas chromatograph proposed in this invention. Figure 2 ; Figure 3 This is a schematic diagram of the structure of a gas chromatography injection device proposed in this invention; Figure 4 This is a partial structural diagram of a gas chromatography injection device proposed in this invention. Figure 1 ; Figure 5 This is a partial structural diagram of a gas chromatography injection device proposed in this invention. Figure 2 ; Figure 6 This is a schematic diagram of the sample disk and disc structure of a gas chromatography injection device proposed in this invention; Figure 7 This is a schematic diagram of the rotary disk structure of a gas chromatography injection device proposed in this invention; Figure 8 This is a schematic diagram of the syringe structure of a gas chromatography injection device proposed in this invention; Figure 9 This is a schematic diagram of the main lifting device structure of a gas chromatography injection apparatus proposed in this invention; Figure 10 This is a schematic diagram of the disk structure of a gas chromatography injection device proposed in this invention.

[0022] In the diagram: 1. Support frame; 2. Main lifting device; 3. Column; 4. Turntable; 5. Syringe; 6. Needle; 7. Secondary lifting device; 8. Piston; 9. Push rod; 10. Sample tray; 11. First vertical shaft; 12. Second vertical shaft; 13. Chain drive assembly; 14. Lower drive motor; 15. Lower transmission gear; 16. Disc; 17. Rubber tube; 18. Rubber pad; 19. Annular ring; 20. Inner pipeline; 21. Spray hole; 22. Annular tube; 23. Nozzle; 24. First connecting tube; 25. 16. Main inner tube; 27. Connecting hole; 28. Circular ring; 29. ​​Side hole; 30. Second connecting pipe; 31. Outer tube; 32. Elastic element; 33. Striking block; 34. Liquid storage tank; 35. Gas storage tank; 36. Main pipeline; 37. Branch pipe; 38. Recovery box; 39. Recovery pipe; 40. Gas chromatograph body; 41. Sample inlet; 42. Circular support plate; 43. Worm gear; 44. Worm wheel; 45. Driven gear; 46. Rack; 47. Upper drive motor; 48. Upper transmission gear; 49. Circular hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0024] Example 1: Refer to Figures 1-10A gas chromatography injection device includes a support frame 1 and a main lifting device 2, fixedly mounted on the support frame 1. The telescopic end of the main lifting device 2 is fixedly connected to a support column 3. A turntable 4 is rotatably mounted on the outer wall of the support column 3. Three sets of circumferentially distributed syringes 5 are rotatably mounted on the turntable 4. Each syringe 5 mainly consists of a needle 6, a push rod 9, a piston 8, and a needle tube. The support column 3 is equipped with a switching component for driving the turntable 4. The switching component includes an upper drive motor 46 fixedly mounted on the support column 3. Upper transmission gears 47 are fixedly mounted on both the output shaft of the upper drive motor 46 and the turntable 4, and the two upper transmission gears 47 are meshed together. A sample tray 10 is rotatably mounted on the support frame 1 via a first vertical shaft 11. A disc 16 is rotatably mounted on the support frame 1 via a second vertical shaft 12. The disc 16 has multiple circumferentially distributed... A rubber pad 18 is fixedly installed in each of the multiple round holes 48. The rubber pad 18 is used to improve the sealing of the injection port 40 of the gas chromatograph body 39. When in use, the needle 6 needs to pass through the rubber pad 18. A rubber tube 17 is fixedly connected to the top of the rubber pad 18. The support frame 1 is provided with an adjustment part that drives the first vertical shaft 11 and the second vertical shaft 12 to rotate. The adjustment part includes a lower drive motor 14 fixedly installed on the support frame 1. The output shaft of the lower drive motor 14 and the outer wall of the second vertical shaft 12 are both fixedly installed with lower transmission gears 15. The two lower transmission gears 15 are meshed and connected. The first vertical shaft 11 and the second vertical shaft 12 are connected by a chain drive assembly 13. The chain drive assembly 13 mainly consists of two sprockets and a chain. In practice, the three syringes 5 are located at three stations, namely the injection station, the rinsing station and the sampling station.

[0025] Specifically, the sample vials are placed circumferentially on the sample tray 10, and multiple rubber pads 18 are placed in multiple holes 48 of the disc 16. Then, the main lifting device 2 drives the turntable 4 and three syringes 5 to move downwards synchronously. The needle 6 of one syringe 5 is inserted into one of the sample vials, the needle 6 of another syringe 5 is inserted into one of the rubber tubes 17 and the rubber pads 18, and the needle 6 of the third syringe 5 is inserted into the recovery tube 38. Thus, the three syringes 5 can simultaneously complete the sample injection, sampling and rinsing work, thereby improving the sample detection efficiency.

[0026] When it is necessary to extract or drain the internal liquid of the syringe 5, the push rod 9 and piston 8 can be moved up or down inside the syringe 5 by the auxiliary lifting device 7. When the piston 8 moves up, the syringe 5 will draw up the sample through the needle 6. Conversely, when the piston 8 moves down, the sample inside the syringe 5 will be discharged into the injection port 40 of the gas chromatograph body 39.

[0027] A recovery box 37 is fixedly connected to the support frame 1. A recovery tube 38 is fixedly connected to the top of the recovery box 37. The recovery tube 38, sample tray 10 and disc 16 are located below the three syringes 5 respectively. The recovery box 37 recovers the waste liquid generated from cleaning the syringes 5 through the recovery tube 38.

[0028] When the three sets of syringes 5 complete the injection, sampling, and rinsing processes respectively, the main lifting device 2 drives the turntable 4 and syringes 5 to move upward. Then, the upper drive motor 46 is started, which drives the turntable 4 to rotate through two meshing upper transmission gears 47. The turntable 4 then drives the three syringes 5 to revolve around the support column 3 until the three syringes 5 exchange positions and the upper drive motor 46 is turned off. Then, the syringe 5 that has been sampled will move to the injection port 40, the syringe 5 that has finished injection will move to the top of the recovery tube 38, and the syringe 5 that has been cleaned will move to the top of the sample tray 10. Then, the above process is repeated, which can quickly realize the sequential injection of multiple samples, significantly improving the sample loading and detection efficiency.

[0029] When the upper drive motor 46 is started, the lower drive motor 14 is started simultaneously. The lower drive motor 14 drives the second vertical shaft 12 to rotate through two meshing lower transmission gears 15. The second vertical shaft 12 drives the first vertical shaft 11 to rotate synchronously through the chain drive assembly 13. The first vertical shaft 11 and the second vertical shaft 12 simultaneously drive the sample tray 10 and the disc 16 to rotate synchronously. When the sample bottle and the rubber pad 18 on the sample tray 10 are switched at the same time, the lower drive motor 14 is turned off, which can quickly complete the replacement of the sample bottle and the rubber pad 18. Thus, the rubber pad 18 is replaced every time it is used in the detection process, ensuring the efficiency and accuracy of sample detection.

[0030] In practice, the inner wall of the rubber tube 17 is also fixedly provided with a plurality of equally spaced annular rings 19, which can further improve the sealing performance of the rubber tube 17 to the needle 6.

[0031] Example 2: Refer to Figures 1-9 A gas chromatography injection device, which is basically the same as that in Example 1, but further includes the following: The syringe 5 has an inner tube 20 inside the plunger 9. The piston 8 of the syringe 5 has a spray hole 21 at its bottom edge that communicates with the inner tube 20. An annular tube 22 is fixedly connected to the lower end of the syringe 5. A nozzle 23 facing the needle 6 at the bottom of the syringe 5 is fixedly installed at the lower end of the annular tube 22. The annular tube 22 is connected to the inner tube 20 through a first connecting tube 24. A solenoid valve is fixedly installed in the input end of the inner tube 20. A secondary lifting device 7 for pushing the plunger 9 is fixedly installed on the turntable 4. Both the main lifting device 2 and the secondary lifting device 7 are electric telescopic rods. A main support column 3 is fixedly installed at the bottom. The inner tube 25 and the outer wall of the support column 3 are rotatably mounted with a ring 27. The outer wall of the ring 27 is provided with three side holes 28 distributed in a circle. The three inner tubes 20 are connected to the three side holes 28 respectively through three second connecting pipes 29. The top of the main inner tube 25 is provided with a connecting hole 26 aligned with one of the side holes 28. The lower end of the main inner tube 25 is fixedly connected to a main pipe 35. A liquid storage tank 33 and a gas storage tank 34 are fixedly installed on the support frame 1. Both the liquid storage tank 33 and the gas storage tank 34 are fixedly connected with branch pipes 36 that communicate with the main pipe 35, and both branch pipes 36 are fixedly installed with solenoid valves.

[0032] Specifically, when the syringe 5 moves to the cleaning station, its corresponding side hole 28 aligns with the connecting hole 26. At this time, the solenoid valve in the branch pipe 36 connected to the reservoir 33 is opened. The cleaning fluid in the reservoir 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 connecting hole 26. It 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 fluid into the syringe 5, thereby completing the cleaning of the inner wall of the syringe 5. Some of the cleaning fluid enters the needle 6 and exits from the needle. The cleaning fluid is discharged from the bottom of the needle 6, while the nozzle 23 sprays the cleaning fluid onto the outer wall of the needle 6, thus completing the cleaning of the outer wall of the needle 6. This automatically completes the cleaning of the syringe 5 from the inside out, ensuring the accuracy of subsequent testing. In order to completely discharge the cleaning fluid in the syringe 5, the piston 8 can be pushed downwards, then the solenoid valve in the current branch pipe 36 is closed, and the solenoid valve in the other branch pipe 36 is opened. The inert gas in the gas tank 34 will then be discharged from the spray hole 21 and the nozzle 23, thus completing the drying process inside and outside the syringe 5 and preventing the cleaning fluid residue from affecting the accuracy of subsequent tests.

[0033] Example 3: Reference Figures 4-8 A gas chromatography injection device, basically the same as in Example 2, but further: The bottom of the aforementioned turntable 4 is rotatably mounted with three circumferentially distributed worm gears 42. The outer walls of the three syringes 5 are fixedly connected with worm wheels 43 that mesh with the three worm gears 42 respectively. The shaft ends of the three worm gears 42 are all fixedly mounted with driven gears 44. A rack 45 is provided above the disc 16 and is fixedly connected to the support frame 1.

[0034] Specifically, when the syringe 5 moves to the injection port 40 and moves downward, the downward-moving turntable 4 will drive the driven gear 44 to sweep across the rack 45. The rack 45 will drive the driven gear 44 to rotate, and the driven gear 44 will drive the worm wheel 43 to rotate through the worm 42. The worm wheel 43 will drive the syringe 5 to rotate, and the syringe 5 will drive the needle 6 to rotate and insert into the rubber tube 17 and the rubber pad 18, thereby reducing the resistance on the needle 6 and extending the service life of the needle 6.

[0035] The shaft end face of the syringe 5 is polygonal in shape. The outer wall of the syringe 5 is surrounded by an outer tube 30 that is fixedly connected to the turntable 4. The inner wall of the outer tube 30 is connected to a striking block 32 through an elastic member 31.

[0036] Specifically, when the polygonal syringe 5 rotates, the edges of the outer wall will strike the striking block 32 inside the outer tube 30, causing the syringe 5 to vibrate. This will loosen the air bubbles at the bottom of the syringe 5, allowing them to escape to the top of the syringe 5, thus reducing the impact of the air bubbles on sample injection and subsequent detection. The rubber tube 17 can improve the sealing of the needle 6 provided by the rubber pad 18, resulting in higher detection accuracy.

[0037] Example 4: Reference Figures 1-3 , Figure 6 as well as Figure 10 A gas chromatograph includes a gas chromatograph body 39 for detecting liquids. The top of the gas chromatograph body 39 is provided with an injection port 40 for injecting liquid samples. A support frame 1 is fixedly installed on the top of the gas chromatograph body 39. An annular support plate 41 is fixedly connected to the top of the injection port 40. The lower end of a disc 16 is attached to the annular support plate 41. The upper port of the injection port 40 is aligned with one of the circular holes 48.

[0038] Specifically, when the disc 16 rotates, the lower end face of the disc 16 will always be in contact with the annular support plate 41, thus ensuring the seal between the two.

[0039] In use, the sample vials are placed circumferentially on the sample tray 10, and multiple rubber pads 18 are placed in multiple holes 48 of the disc 16. Then, the main lifting device 2 drives the turntable 4 and three syringes 5 to move downwards synchronously. The needle 6 of one syringe 5 is inserted into one of the sample vials, the needle 6 of another syringe 5 is inserted into one of the rubber tubes 17 and the rubber pads 18, and the needle 6 of the third syringe 5 is inserted into the recovery tube 38. Thus, the three syringes 5 can simultaneously complete the sample injection, sampling and rinsing work, thereby improving the sample detection efficiency.

[0040] When it is necessary to extract or drain the internal liquid of the syringe 5, the push rod 9 and piston 8 can be moved up or down inside the syringe 5 by the auxiliary lifting device 7. When the piston 8 moves up, the syringe 5 will draw up the sample through the needle 6. Conversely, when the piston 8 moves down, the sample inside the syringe 5 will be discharged into the injection port 40 of the gas chromatograph body 39.

[0041] When the three sets of syringes 5 complete the injection, sampling, and rinsing processes respectively, the main lifting device 2 drives the turntable 4 and syringes 5 to move upward. Then, the upper drive motor 46 is started, which drives the turntable 4 to rotate through two meshing upper transmission gears 47. The turntable 4 then drives the three syringes 5 to revolve around the support column 3 until the three syringes 5 exchange positions and the upper drive motor 46 is turned off. The syringe 5 that has been sampled will then move to the injection port 40, the syringe 5 that has finished injection will move to the top of the recovery tube 38, and the syringe 5 that has been cleaned will move to the top of the sample tray 10. The above process is then repeated, which can quickly realize the sequential injection of multiple samples and significantly improve the sample loading and detection efficiency.

[0042] When the upper drive motor 46 is started, the lower drive motor 14 is started simultaneously. The lower drive motor 14 drives the second vertical shaft 12 to rotate through two meshing lower transmission gears 15. The second vertical shaft 12 drives the first vertical shaft 11 to rotate synchronously through the chain drive assembly 13. The first vertical shaft 11 and the second vertical shaft 12 simultaneously drive the sample tray 10 and the disc 16 to rotate synchronously. When the sample bottle and the rubber pad 18 on the sample tray 10 are switched at the same time, the lower drive motor 14 is turned off, which can quickly complete the replacement of the sample bottle and the rubber pad 18. Thus, the rubber pad 18 is replaced every time it is used in the detection process, ensuring the efficiency and accuracy of sample detection.

[0043] When syringe 5 moves to the cleaning station, its corresponding side hole 28 aligns with the connecting hole 26. At this time, the solenoid valve in the branch pipe 36 connected to the reservoir 33 is opened. The cleaning fluid in the reservoir 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 connecting hole 26. It 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 fluid into syringe 5, thereby completing the cleaning of the inner wall of syringe 5. Some of the cleaning fluid will also enter the needle 6. The cleaning fluid is discharged from the bottom of the needle 6, while the nozzle 23 sprays the cleaning fluid onto the outer wall of the needle 6, thus completing the cleaning of the outer wall of the needle 6. This automatically completes the cleaning of the syringe 5 from the inside out. To completely discharge the cleaning fluid from the syringe 5, the piston 8 can be pushed downwards. Then, the solenoid valve in the current branch pipe 36 is closed, and the solenoid valve in the other branch pipe 36 is opened. The inert gas in the gas tank 34 will then be discharged from the spray hole 21 and the nozzle 23, thus completing the drying of the syringe 5 inside and out and preventing cleaning fluid residue from affecting subsequent accuracy.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been described above with reference to preferred embodiments, it is not intended to limit the present invention. Any modifications or alterations made by those skilled in the art without departing from the scope of the present invention using the above-described technical content can be considered as equivalent embodiments. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A gas chromatography injection device, comprising a support frame (1), characterized in that, Also includes: The main lifting device (2) is fixedly installed on the support frame (1). Among them, the telescopic end of the main lifting device (2) is fixedly connected to a support column (3), the outer wall of the support column (3) is rotatably mounted with a turntable (4), three sets of circumferentially distributed syringes (5) are rotatably mounted on the turntable (4), and the support column (3) is provided with a switching component to drive the turntable (4) to rotate. The sample tray (10) is rotatably mounted on the support frame (1) via the first vertical shaft (11). The support frame (1) is rotatably mounted with a disc (16) via a second vertical shaft (12). The disc (16) has multiple circular holes (48) distributed around its circumference. Each of the multiple circular holes (48) is fixedly fitted with a rubber pad (18). A rubber tube (17) is fixedly connected to the top of the rubber pad (18). The support frame (1) is provided with an interchange part that drives the first vertical shaft (11) and the second vertical shaft (12) to rotate.

2. The gas chromatography injection device according to claim 1, characterized in that, The switching component includes an upper drive motor (46) fixedly installed on the support column (3). The output shaft of the upper drive motor (46) and the turntable (4) are both fixedly equipped with upper transmission gears (47), and the two upper transmission gears (47) are meshed together.

3. The gas chromatography injection device according to claim 1, characterized in that, The switching unit includes a lower drive motor (14) fixedly installed on the support frame (1). The output shaft of the lower drive motor (14) and the outer wall of the second vertical shaft (12) are both fixedly installed with lower transmission gears (15). The two lower transmission gears (15) are meshed and connected. The first vertical shaft (11) and the second vertical shaft (12) are connected by a chain drive assembly (13).

4. The gas chromatography injection device according to claim 1, characterized in that, The syringe (5) has an inner tube (20) inside the push rod (9). The bottom edge of the piston (8) of the syringe (5) has a spray hole (21) that communicates with the inner tube (20). The lower end of the syringe (5) is fixedly connected to an annular tube (22). The lower end of the annular tube (22) is fixedly installed with a nozzle (23) facing the needle (6) at the bottom of the syringe (5). The annular tube (22) is connected to the inner tube (20) through a first connecting tube (24). A solenoid valve is fixedly installed in the input end of the inner tube (20). A secondary lifting device (7) that pushes the push rod (9) is fixedly installed on the turntable (4).

5. A gas chromatography injection device according to claim 4, characterized in that, The bottom of the support column (3) is fixedly provided with a main inner tube (25), and a ring (27) is rotatably installed on the outer wall of the support column (3). The outer wall of the ring (27) is provided with three side holes (28) distributed in a circle. The three inner tubes (20) are connected to the three side holes (28) respectively through three second connecting pipes (29). The top of the main inner tube (25) is provided with a connecting hole (26) aligned with one of the side holes (28). The lower end of the main inner tube (25) is fixedly connected with a main pipe (35).

6. A gas chromatography injection device according to claim 5, characterized in that, The support frame (1) is fixedly installed with a liquid storage tank (33) and a gas storage tank (34). Both the liquid storage tank (33) and the gas storage tank (34) are fixedly connected with branch pipes (36) that communicate with the main pipeline (35), and both branch pipes (36) are fixedly installed with solenoid valves.

7. A gas chromatography injection device according to claim 1, characterized in that, Three circumferentially distributed worm gears (42) are rotatably mounted on the bottom of the turntable (4). The outer walls of the three syringes (5) are fixedly connected with worm wheels (43) that mesh with the three worm gears (42). Driven gears (44) are fixedly mounted on the shaft ends of the three worm gears (42). A rack (45) fixedly connected to the support frame (1) is provided above the disc (16).

8. A gas chromatography injection device according to claim 7, characterized in that, The syringe (5) has a polygonal shape at the end face of its shaft. The outer wall of the syringe (5) is surrounded by an outer tube (30) that is fixedly connected to the turntable (4). The inner wall of the outer tube (30) is connected to a striking block (32) through an elastic element (31).

9. A gas chromatography injection device according to claim 1, characterized in that, A recycling box (37) is fixedly connected to the support frame (1), and a recycling tube (38) is fixedly connected to the top of the recycling box (37). The recycling tube (38), sample tray (10) and disc (16) are located below the three syringes (5).

10. A gas chromatograph, comprising a gas chromatograph injection device as described in any one of claims 1-9, and further comprising a gas chromatograph body (39), wherein the top of the gas chromatograph body (39) is provided with an injection port (40), characterized in that, The support frame (1) is fixedly installed on the top of the gas chromatograph body (39), and an annular support plate (41) is fixedly connected to the top of the injection port (40). The lower end of the disc (16) is attached to the annular support plate (41), and the upper port of the injection port (40) is aligned with one of the circular holes (48).

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