Instrument sample introduction device of novel gas chromatograph and use method of instrument sample introduction device

Abstract

The invention relates to the technical field of gas chromatograph sample introduction, in particular to a novel gas chromatograph instrument sample introduction device which comprises a bottom plate, a rotating rod, a fixing plate and a supporting plate, the rotating rod is rotationally connected between the bottom plate and the fixing plate, the supporting plate is arranged on the periphery of the rotating rod in an up-down sliding mode, and the supporting plate and the rotating rod synchronously rotate; a sampling placement mechanism, a sample introduction communication mechanism and a cleaning and recycling mechanism are arranged on the top surface of the bottom plate in a circumferential array manner by taking the rotating rod as an axis, and the sampling placement mechanism and the sample introduction communication mechanism rotate along with the rotation of the rotating rod; injection and extraction mechanisms are arranged on the support plate and correspond to the upper parts of the sampling placement mechanism, the sample introduction communication mechanism and the cleaning and recycling mechanism; and the injection and extraction mechanisms are detachably arranged on the support plate. Through the arrangement of the lifting component and the limiting ring, the injection and extraction mechanism can be limited, the stability of the injection and extraction mechanism can be guaranteed, it can also be guaranteed that the processes of quick insertion, quick injection and quick pulling can be achieved in the sample injection process, and the detection accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of gas chromatograph sample introduction technology, and in particular to a novel gas chromatograph sample introduction device and a method for using the novel gas chromatograph sample introduction device. Background Technology

[0002] Gas chromatographs are widely used analytical instruments, and the performance of their injection systems directly affects the accuracy and reproducibility of analytical results.

[0003] During the injection process, the injection needle needs to be inserted, injected, and withdrawn quickly. If the needle is not withdrawn in time, it will block the septum of the injection port, severely obstructing the flow path of the carrier gas and disrupting the stability of the gas flow inside the injection port. Therefore, the three steps of quick insertion, quick injection, and quick withdrawal must be followed during the injection process. However, the injection process in the existing technology still has significant defects.

[0004] For example, the gas chromatography injection device and gas chromatograph disclosed in Chinese Patent No. CN120870422A use three needles to perform sampling, injection and cleaning respectively, and the three needles can move up and down simultaneously to complete the sampling, injection and cleaning synchronously. In addition, the needles can be cleaned inside and out during the cleaning process to ensure the accuracy of subsequent detection.

[0005] However, since the three needles are inserted synchronously during the sampling process, it is impossible to quickly withdraw the needles. If the needles are quickly withdrawn, the sampling needles cannot sample properly. Furthermore, cleaning the needles at this time will cause the cleaning solution to be discharged into the environment, affecting the cleaning process. Therefore, this method cannot achieve the process of quick insertion, quick injection, and quick withdrawal of the needles, which will affect the test results. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides the following technical solution: A novel gas chromatograph's sample introduction device includes a base plate, a rotating rod, a fixed plate, and a support plate. The rotating rod is rotatably connected between the base plate and the fixed plate. The support plate is slidably disposed around the rotating rod and rotates synchronously with it. A sampling placement mechanism, a sample introduction communication mechanism, and a cleaning and recovery mechanism are arranged in a circular array around the rotating rod on the top surface of the base plate. The sampling placement mechanism and the sample introduction communication mechanism rotate with the rotating rod. An injection extraction mechanism is disposed above each of the sampling placement mechanism, the sample introduction communication mechanism, and the cleaning and recovery mechanism on the support plate. The injection extraction mechanism is detachably disposed on the support plate. A limiting mechanism is disposed between the support plate and the fixed plate to define the position of the injection extraction mechanism. The limiting mechanism is rotatably connected to the rotating rod. The limiting mechanism includes a lifting component and a limiting ring. The lifting component is disposed above the sample introduction communication mechanism. The lifting component and the limiting ring are slidably connected. The injection extraction mechanism is rotatably slidably connected to the lifting component and the limiting ring. The lifting component is slidably disposed up and down.

[0007] As an improvement to the above technical solution, the sampling placement mechanism includes a first placement plate and a first placement cylinder. The first placement cylinder is fixedly arranged in a circumferential array on the top surface of the first placement plate. The sample injection and communication mechanism includes a second placement plate and a second placement cylinder. The second placement cylinder is arranged in a circumferential array on the top surface of the second placement plate and is detachably arranged on the top surface of the second placement plate. Both the second placement plate and the first placement plate are provided with support legs on their bottom surfaces, and the support legs are fixedly connected to the base plate.

[0008] As an improvement to the above technical solution, a stepper motor is fixedly connected to the top surface of the fixed plate, the power output end of the stepper motor is fixedly connected to the rotating rod, a gear is fixedly connected to the periphery of the rotating rod, and toothed blocks that mesh with the gear are fixedly connected to the periphery of both the first and second placement plates.

[0009] As an improvement to the above technical solution, the cleaning and recycling mechanism includes a cleaning box, a gas storage tank, a vacuum pump, a first connecting pipe, a cleaning cylinder, a blowing hood, a spray hood, and a second liquid storage tank. The cleaning box is fixedly connected to the top surface of the base plate, and the cleaning cylinder is fixedly connected to the top surface of the cleaning box, with the cleaning cylinder corresponding to the injection extraction mechanism. The second liquid storage tank is fixedly connected to the inner wall of the cleaning box, and the spray hood is fixedly connected to the inner wall of the cleaning cylinder near the top. A second connecting pipe is fixedly connected between the spray hood and the second liquid storage tank. Spray heads are arranged in a circular array on the spray hood. A drying cylinder is fixedly connected to the top of the cleaning cylinder. The blowing hood is fixedly connected to the drying cylinder, and air jets that blow air downwards are arranged in a circular array on the blowing hood. The gas storage tank is fixedly located at the center of the top surface of the cleaning box, and the vacuum pump is fixedly located on the gas storage tank. The first connecting pipe is fixedly connected between the vacuum pump and the cleaning cylinder, and one end of the first connecting pipe is connected to the blowing hood.

[0010] As an improvement to the above technical solution, the injection extraction mechanism includes an injection cylinder, an installation cylinder, and a limiting plate. The support plate has an insertion hole for the installation cylinder. A fastening nut is threaded onto the outer periphery of the installation cylinder. A limiting block is fixedly connected to the installation cylinder. A limiting groove is provided on the support plate for the limiting block to insert into. The injection cylinder is slidably inserted into the installation cylinder. A limiting rod is fixedly connected to the outer periphery of the injection cylinder. A sliding groove is provided on the inner wall of the installation cylinder, which slidably connects to the limiting rod. A sampling needle is fixedly installed at the bottom end of the injection cylinder. The top surface of the injection cylinder is fixedly connected to the limiting plate. A sampling rod is slidably inserted into the inner wall of the injection cylinder. A power mechanism for driving the sampling rod to slide up and down is provided on the support plate. The power mechanism includes a second support rod, a second electric telescopic rod, and a threaded sleeve. A threaded rod is fixedly connected to the top end of the sampling rod through the injection cylinder. The threaded sleeve is threaded onto the outer periphery of the threaded rod. The second support rod is L-shaped and fixedly installed on the top surface of the support plate. The second electric telescopic rod is fixedly connected between the second support rod and the threaded sleeve.

[0011] As an improvement to the above technical solution, a liquid storage cylinder is fixedly connected to the inner wall of the syringe. The liquid storage cylinder has a cylindrical structure and an internal liquid storage cavity. A piston is slidably fitted onto the inner wall of the liquid storage cylinder. The piston is fixedly connected to a sampling rod. A guide tube communicating with the liquid storage cavity is fixedly connected to one side of the bottom of the liquid storage cylinder. A first micro solenoid valve is fixedly connected to the bottom of the guide tube through the syringe. A second micro solenoid valve is installed inside the cleaning cylinder and docks with the first micro solenoid valve. A suction tube is fixedly connected to the bottom of the second micro solenoid valve and is fixedly connected to a second liquid storage tank. An inlet tube communicating with the syringe and the liquid storage cavity is fixedly installed on the other side of the bottom of the liquid storage cylinder. A third solenoid valve is installed inside the inlet tube. A fourth solenoid valve communicating with the syringe and the liquid storage cavity is fixedly connected to one side of the top of the liquid storage cylinder. The fourth solenoid valve is located above the piston.

[0012] As an improvement to the above technical solution, the lifting component includes a guide plate and a first electric telescopic rod. The guide plate is slidably disposed between the ends of the limiting ring, and the first electric telescopic rod is disposed between the support plate and the guide plate. The bottom end of the first electric telescopic rod is rotatably connected to the support plate, and the top end is fixedly connected to the guide plate. The guide plate and the limiting ring form a ring structure and are slidably inserted into the limiting plate.

[0013] As an improvement to the above technical solution, the limiting mechanism further includes a telescopic tube and a sleeve. The telescopic tube is fixedly disposed between the fixed plate and the sleeve, and both the telescopic tube and the sleeve are sleeved around the rotating rod. A sliding groove is provided on the outer side of the sleeve for the guide plate to slide up and down. A connecting support rod is fixedly connected between the limiting ring and the sleeve.

[0014] As an improvement to the above technical solution, a first support rod is fixedly connected between the base plate and the fixed plate. An adjusting rod is slidably sleeved on the periphery of the first support rod corresponding to the support plate. The adjusting rod is rotatably connected to the periphery of the support plate. A third electric telescopic rod is fixedly installed between the adjusting rod and the base plate.

[0015] A method for using a novel gas chromatograph's sample introduction device includes the following steps: S1: Assembly: Assemble the syringe into the mounting cylinder installed in the socket. After the installation of the three sets of syringes is completed, the limiting ring is positioned above the cleaning cylinder and the first placement cylinder where the sampling bottle is placed, and the guide plate is positioned above the second placement cylinder. At this time, the connecting tube corresponds to the liquid extraction tube. S2: Sample injection: The third electric telescopic rod is activated, causing the three syringes to move downwards simultaneously into the first placement syringe, the second placement syringe, and the cleaning syringe. One syringe is used for sampling, one for injection, and the other for cleaning. After the injection is completed, the first electric telescopic rod is activated, causing the guide plate to move the limiting plate upwards quickly, which in turn causes the syringe in the injection process to move upwards quickly, and the injection needle is quickly pulled out, achieving a fast withdrawal process. S3: Cleaning: After the injection is completed, the syringe is inserted into the cleaning cylinder, so that the first solenoid valve and the second solenoid valve are connected, allowing the cleaning solution to be introduced into the storage chamber. Then, it is slowly moved upward to thoroughly clean the outer and inner walls of the injection needle, and the injection needle is dried by the air blowing hood. S4: Disassembly: The guide plate moves upward and the rotating rod rotates at a certain angle, causing the guide plate to disengage from the limiting plate. At this time, the syringe can be disassembled.

[0016] The beneficial effects of this invention are: 1. By improving the design of components and limiting rings, the injection extraction mechanism can be limited to ensure its stability, and the process of quick insertion, injection and withdrawal during sample introduction can be achieved, thereby improving the accuracy of detection. 2. The blower is positioned above the spray nozzle to facilitate drying of the cleaned injection needle. The first and second solenoid valves facilitate connection and liquid delivery to the storage chamber after docking. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an enlarged view showing the positional relationship between the first placement plate and the second placement plate of the present invention; Figure 3 This is an enlarged view showing the positional relationship between the cleaning tank and the storage tank in this invention; Figure 4 This is an enlarged structural diagram of the liquid storage tank of the present invention; Figure 5 This is an enlarged view of the connection structure between the injection cylinder and the mounting cylinder of the present invention; Figure 6 This is an enlarged cross-sectional view of the syringe of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram of region A in the middle; Figure 8 This is an enlarged view showing the positional relationship between the sleeve and the limiting plate of the present invention; Figure 9 This is an enlarged view showing the positional relationship between the support plate and the second electric telescopic rod of the present invention.

[0018] Reference numerals: 1. Base plate; 11. Cleaning box; 111. Gas storage tank; 12. First support rod; 2. First placement plate; 21. First placement cylinder; 22. Support leg; 3. Second placement plate; 31. Second placement cylinder; 32. Tooth block; 4. Air pump; 41. First connecting pipe; 5. Rotating rod; 51. Gear; 6. Fixing plate; 61. Stepper motor; 62. Telescopic tube; 7. Sleeve; 71. Slide groove; 72. Limiting ring; 73. Guide plate; 8. Support plate; 81. First electric telescopic rod; 82. Insertion hole; 83. Limiting groove; 84. 841. Second support rod; 842. Second electric telescopic rod; 9. Threaded sleeve; 9. Cleaning cylinder; 91. Drying cylinder; 911. Air blowing hood; 92. Spray hood; 921. Second connecting pipe; 93. Second liquid storage tank; 931. Liquid extraction pipe; 10. Injection cylinder; 101. Limiting rod; 102. Mounting cylinder; 1021. Fastening nut; 1022. Limiting block; 103. Sampling rod; 1031. Threaded rod; 1032. Limiting plate; 1033. Piston; 104. Liquid storage cylinder; 1041. Conductor pipe; 1042. Liquid inlet pipe. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] Please refer to Figures 1-9 As shown, the present invention provides a novel sample injection device for a gas chromatograph, including a base plate 1, a rotating rod 5, a fixed plate 6, and a support plate 8. The rotating rod 5 is rotatably connected between the base plate 1 and the fixed plate 6. The support plate 8 is slidably disposed around the rotating rod 5, and the support plate 8 rotates synchronously with the rotating rod 5. The top surface of the base plate 1 is arranged in a circular array with the rotating rod 5 as the axis. The sampling placement mechanism, the sample injection and communication mechanism and the cleaning and recovery mechanism rotate with the rotation rod 5. An injection extraction mechanism is provided above the sampling placement mechanism, the sample injection communication mechanism, and the cleaning and recovery mechanism on the support plate 8. The injection extraction mechanism is detachably installed on the support plate 8. A limiting mechanism is provided between the support plate 8 and the fixed plate 6 to limit the position of the injection extraction mechanism, and the limiting mechanism is rotatably connected to the rotating rod 5; The limiting mechanism includes a lifting component and a limiting ring 72. The lifting component is located above the sample injection communication mechanism. The lifting component and the limiting ring 72 are slidably connected. The injection extraction mechanism is rotatably slidably connected to the lifting component and the limiting ring 72. The lifting component is slidably installed up and down.

[0021] In this case, the sampling placement mechanism is used to place the sample vials to be sampled, so that the sample can be extracted using the injection extraction mechanism. The injection connection mechanism is used to install the injection needle sleeve, which facilitates the injection of the sample vial. The injection connection mechanism located below the injection extraction mechanism is connected to the injection port of the gas chromatograph, so that the injection needle can be inserted into the injection port of the gas chromatograph. The cleaning and recovery mechanism is used to clean the injection extraction mechanism to ensure the cleanliness of the injection extraction mechanism after use, so as to prevent it from affecting reuse. At the same time, the sampling placement mechanism and the injection connection mechanism rotate with the rotation of the rotating rod 5. When the rotating rod 5 rotates, it can make the sampling placement mechanism and the injection connection mechanism rotate, so that another set of sample vials and the injection sleeve are aligned, so as to continuously detect the sample.

[0022] Supplement: The support plate 8 can rotate with the rotation of the rotating rod 5 and can slide up and down around the rotating rod 5. A limiting slide rod is provided around the rotating rod 5, and the support plate 8 is provided with a groove that slides up and down along the limiting slide rod. This can limit the support plate 8 and prevent the support plate 8 from being stationary during the rotation of the rotating rod 5, so that the support plate 8 can rotate with the rotation of the rotating rod 5. The limiting slide rod and the groove are not shown in the attached drawings.

[0023] The injection extraction mechanism is mounted on the support plate 8 and is respectively set with the sampling placement mechanism, the sample injection communication mechanism and the cleaning and recovery mechanism, so as to complete the sampling-injection-cleaning process of the injection extraction mechanism.

[0024] The lifting component and limiting ring 72 effectively limit the injection extraction mechanism, ensuring its stability on the support plate 8. The lifting component and limiting ring 72 do not rotate with the rotating rod 5, thus remaining stationary relative to the injection extraction mechanism. When the injection extraction mechanism rotates along the limiting ring 72 and the lifting component, the injection extraction mechanism moving above the injection communication mechanism is limited by the lifting component. The lifting component drives the injection extraction mechanism to move up and down, and quickly pulls out the injection needle inserted into the injection communication mechanism, completing the quick-pull process.

[0025] like Figure 1As shown, the injection extraction mechanism is provided in three sets, corresponding to the sampling placement mechanism, the sample injection communication mechanism, and the cleaning and recovery mechanism, respectively. In use, the support plate 8 moves downward, which can simultaneously drive the three sets of injection extraction mechanisms to move downward synchronously, so that the injection extraction mechanism is inserted into the sampling placement mechanism, the sample injection communication mechanism, and the cleaning and recovery mechanism, respectively, to complete the quick insertion and quick injection process in the sample injection process. Then, the lifting component completes the quick withdrawal process in the sample injection process. Therefore, it can realize the three steps of quick insertion, quick injection, and quick withdrawal, avoid affecting the test results due to failure to withdraw in time, improve the accuracy of the test, and the quick withdrawal does not affect the sampling and cleaning of the other two sets of injection extraction mechanisms.

[0026] By improving the components and setting the limiting ring 72, the injection extraction mechanism can be limited to ensure its stability, and the process of quick insertion, injection and withdrawal during sample introduction can be achieved, thereby improving the accuracy of detection.

[0027] like Figure 1 and Figure 2 As shown, the sampling placement mechanism includes a first placement plate 2 and a first placement cylinder 21. The first placement cylinder 21 is fixedly arranged in a circumferential array on the top surface of the first placement plate 2. The sample injection and communication mechanism includes a second placement plate 3 and a second placement cylinder 31. The second placement cylinder 31 is arranged in a circumferential array on the top surface of the second placement plate 3, and the second placement cylinder 31 is detachably arranged on the top surface of the second placement plate 3. Both the second placement plate 3 and the first placement plate 2 are provided with support legs 22, which are fixedly connected to the base plate 1.

[0028] A stepper motor 61 is fixedly connected to the top surface of the fixed plate 6. The power output end of the stepper motor 61 is fixedly connected to the rotating rod 5. A gear 51 is fixedly connected to the periphery of the rotating rod 5. A toothed block 32 that meshes with the gear 51 is fixedly connected to the periphery of both the first placement plate 2 and the second placement plate 3.

[0029] The first placement cylinder 21 is designed to hold a sampling bottle containing the sample, while the second placement cylinder 31 is designed to accommodate the injection needle of the injection extraction mechanism. The second placement cylinder 31 is designed to be detachable, making it easy to replace. At the same time, a set of second placement cylinders 31 located below the injection extraction mechanism is connected to the injection port of the gas chromatograph. After the injection needle is inserted into the second placement cylinder 31, it can be inserted into the injection port to inject the sample into the gas chromatograph for detection.

[0030] The stepper motor 61 can drive the gear 51 to rotate. The first placement plate 2 and the second placement plate 3 are both provided with tooth blocks 32 that mesh with the gear 51. Therefore, the gear 51 can drive the first placement plate 2 and the second placement plate 3 to rotate at the same time, changing the position of the first placement cylinder 21 and the second placement cylinder 31, so that the other set of first placement cylinder 21 and second placement cylinder 31 corresponds to the injection extraction mechanism.

[0031] like Figure 1 , Figure 3 and Figure 4 As shown, the cleaning and recycling mechanism includes a cleaning box 11, an air storage tank 111, an air pump 4, a first connecting pipe 41, a cleaning cylinder 9, an air blowing hood 911, a liquid spraying hood 92, and a second liquid storage tank 93. The cleaning box 11 is fixedly connected to the top surface of the base plate 1, and the cleaning cylinder 9 is fixedly connected to the top surface of the cleaning box 11, with the cleaning cylinder 9 corresponding to the injection extraction mechanism. The second liquid storage tank 93 is fixedly connected to the inner wall of the cleaning box 11, and the liquid spraying hood 92 is fixedly connected to the inner wall of the cleaning cylinder 9 near the top. The liquid spraying hood 92 and the second liquid storage tank 93 are fixedly connected together. A second connecting pipe 921 is fixedly connected to the cleaning cylinder 9. Spray nozzles are arranged in a circular array on the spray hood 92. A drying cylinder 91 is fixedly connected to the top of the cleaning cylinder 9. An air blowing hood 911 is fixedly connected to the drying cylinder 91. An air blowing hood 911 is arranged in a circular array with downward-sloping air jets. An air storage tank 111 is fixedly installed at the center of the top surface of the cleaning box 11. An air pump 4 is fixedly installed on the air storage tank 111. A first connecting pipe 41 is fixedly connected between the air pump 4 and the cleaning cylinder 9. One end of the first connecting pipe 41 is connected to the air blowing hood 911.

[0032] With the cleaning cylinder 9 in place, when cleaning is required after sample injection, the injection needle at the bottom of the injection extraction mechanism is inserted into the cleaning cylinder 9. The cleaning solution is sprayed out to the outside of the injection needle through the spray head on the spray hood 92 to clean the outside of the injection needle. After cleaning, during the upward movement, the gas blown out by the air nozzle on the air blowing hood 911 dries the injection needle, thus completing the cleaning and drying of the outside of the injection needle.

[0033] The structure of the second liquid storage tank 93 is as follows: Figure 4 As shown, the structure of its top surface is recessed from both sides towards the middle and slopes downwards to facilitate the downward flow of the cleaned liquid into the cleaning tank 11. A drain valve is provided at the bottom of one side of the cleaning tank 11, which is not shown in the figure, to drain the cleaned liquid. This structure can prevent the liquid from stagnating on the top surface of the second storage tank 93.

[0034] Among them, such as Figure 3 As shown, the positional relationship between the cleaning cylinder 9 and the second liquid storage tank 93 can be seen. The cleaning cylinder 9 is fixedly installed on the top surface of the cleaning box 11, and the second liquid storage tank 93 is installed inside the cleaning box 11. The cleaning cylinder 9 and the second liquid storage tank 93 are positioned vertically, and the top of the second liquid storage tank 93 is in contact with the top surface of the inner wall of the cleaning box 11. The design of the top surface of the second liquid storage tank 93 prevents liquid from accumulating on the top surface of the second liquid storage tank 93 and affecting the cleaning of the injection needle. Furthermore, the downward flow of the cleaning liquid can also clean the top surface of the second liquid storage tank 93, preventing impurities from accumulating on its top surface and preventing impurities from splashing onto the injection needle.

[0035] like Figure 3 , Figure 5 , Figure 6 , Figure 7 and Figure 9 As shown, the injection extraction mechanism includes an injection cylinder 10, an installation cylinder 102, and a limiting plate 1032. The support plate 8 has an insertion hole 82 for the installation cylinder 102 to be inserted into. A fastening nut 1021 is threaded onto the outer periphery of the installation cylinder 102. A limiting block 1022 is fixedly connected to the installation cylinder 102. A limiting groove 83 is provided on the support plate 8 for the limiting block 1022 to be inserted into. The injection cylinder 10 is slidably inserted into the installation cylinder 102. A limiting rod 101 is fixedly connected to the outer periphery of the injection cylinder 10. A sliding groove is provided on the inner wall of the installation cylinder 102 to slidably connect with the limiting rod 101. An injection needle is fixedly installed at the bottom end of the injection cylinder 10. The top surface of the syringe 10 is fixedly connected to the limiting plate 1032. A sampling rod 103 is slidably inserted into the inner wall of the syringe 10. A power mechanism for driving the sampling rod 103 to slide up and down is provided on the support plate 8. The power mechanism includes a second support rod 84, a second electric telescopic rod 841, and a threaded sleeve 842. The top end of the sampling rod 103 passes through the syringe 10 and is fixedly connected to the threaded rod 1031. The threaded sleeve 842 is threadedly connected to the outer periphery of the threaded rod 1031. The second support rod 84 is L-shaped and fixedly installed on the top surface of the support plate 8. The second electric telescopic rod 841 is fixedly connected between the second support rod 84 and the threaded sleeve 842.

[0036] A liquid storage cylinder 104 is fixedly connected to the inner wall of the syringe 10. The liquid storage cylinder 104 has a cylindrical structure and an internal liquid storage cavity. A piston 1033 is slidably fitted onto the inner wall of the liquid storage cylinder 104. The piston 1033 is fixedly connected to the sampling rod 103. A connecting tube 1041 communicating with the liquid storage cavity is fixedly connected to one side of the bottom end of the liquid storage cylinder 104. The bottom end of the connecting tube 1041 passes through the syringe 10 and is fixedly connected to a first micro solenoid valve. A cleaning cylinder 9 is provided with a valve connected to the first micro solenoid valve. The valve is connected to a second miniature solenoid valve. The bottom end of the second miniature solenoid valve is fixedly connected to a liquid extraction pipe 931, which is fixedly connected to the second liquid storage tank 93. The other side of the bottom end of the liquid storage cylinder 104 is fixedly provided with an inlet pipe 1042 that connects the injection cylinder 10 and the liquid storage chamber. A third solenoid valve is provided inside the inlet pipe 1042. A fourth solenoid valve for connecting the injection cylinder 10 and the liquid storage chamber is fixedly connected to one side of the top end of the liquid storage cylinder 104. The fourth solenoid valve is located above the piston 1033.

[0037] By inserting the mounting cylinder 102 into the insertion hole 82 and the limiting block 1022 into the limiting groove 83, the mounting cylinder 102 is limited to ensure its position. Then, the fastening nut 1021 is sleeved from the bottom of the mounting cylinder 102 to the outside of the mounting cylinder 102, and the mounting cylinder 102 is fastened to the support plate 8. Then, the injection cylinder 10 is inserted into the mounting cylinder 102 and limited by the limiting rod 101 to ensure the position of the bottom guide tube 1041 of the injection cylinder 10. When installing the injection cylinder 10, it needs to be installed in conjunction with the lifting component and assembled and installed in groups. After the injection cylinder 10 is installed, the cleaning fluid is first injected into the storage chamber of the storage cylinder 104 through the guide tube 1041 to keep it in the storage chamber. Then, the sampling and injection process is completed.

[0038] When cleaning is required after sample injection, the injection needle is inserted into the cleaning cylinder 9, which connects the first and second solenoid valves. At this time, the downward pressure of the sampling rod 103 increases the space above the piston 1033, generating negative pressure suction. The opening of the fourth solenoid valve then transfers this negative pressure suction to the storage chamber, drawing the cleaning fluid from the second storage tank 93 into the storage chamber for storage. Simultaneously, the spray head sprays cleaning fluid to clean the periphery of the injection needle. Then, the syringe 10 is moved upwards, disconnecting and closing the first and second solenoid valves to prevent leakage. This upward movement provides comprehensive cleaning of the injection needle. After disconnecting the first solenoid valve... When the second solenoid valve is in the docking state, the sampling rod 103 moves upward, which reduces the space above the piston 1033 and increases the pressure, causing the pressure to be released into the liquid storage chamber, increasing the pressure in the liquid storage chamber, so that the liquid enters the syringe 10 from the inlet pipe 1042 to clean the inside of the syringe 10. Then the sampling rod 103 moves downward to squeeze out the cleaning liquid. At this time, the syringe 10 is still in the process of moving upward. After the cleaning liquid is discharged from the syringe 10, the bottom of the injection needle is still in the cleaning cylinder 9, and at this time the jet head can dry the outside of the cleaned injection needle. After cleaning is completed, the first solenoid valve, the second solenoid valve, the third solenoid valve and the fourth solenoid valve are all in the closed state.

[0039] The second electric telescopic rod 841 facilitates the up-and-down movement of the sampling rod 103. The threaded rod 1031 is threadedly connected to the threaded sleeve 842, which facilitates its disassembly.

[0040] like Figure 1 and Figure 8As shown, the lifting component includes a guide plate 73 and a first electric telescopic rod 81. The guide plate 73 is slidably disposed between the ends of the limiting ring 72. The first electric telescopic rod 81 is disposed between the support plate 8 and the guide plate 73. The bottom end of the first electric telescopic rod 81 is rotatably connected to the support plate 8, and the top end is fixedly connected to the guide plate 73. The guide plate 73 and the limiting ring 72 form a ring structure and are slidably inserted into the limiting plate 1032.

[0041] By setting the guide plate 73, such as Figure 8 As shown, the structure of the guide plate 73 can be seen. Its periphery and the limiting ring 72 can form a ring structure to limit the limiting plate 1032 and ensure its stability.

[0042] The limiting plate 1032 can move around the circumference of the limiting ring 72 as the rotating rod 5 rotates, so that the combination of the limiting ring 72 and the guide plate 73 is always inserted into the limiting plate 1032 to limit its position. Since the limiting plate 1032 and the syringe 10 are a whole, when the syringe 10 needs to be disassembled, the first electric telescopic rod 81 is activated to push the limiting plate 1032 upward, causing the guide plate 73 to be misaligned with the limiting ring 72. Then, the rotating rod 5 is rotated to disengage the guide plate 73 from the limiting plate 1032. At this time, the syringe 10 can be moved upward to complete the disassembly of the syringe 10. The installation process repeats the above process, and the syringes 10 are installed one by one.

[0043] The limiting mechanism also includes a telescopic tube 62 and a sleeve 7. The telescopic tube 62 is fixedly installed between the fixed plate 6 and the sleeve 7, and both the telescopic tube 62 and the sleeve 7 are sleeved around the rotating rod 5. The sleeve 7 has a groove 71 on its outer side for the guide plate 73 to slide up and down. A connecting support rod is fixedly connected between the limiting ring 72 and the sleeve 7.

[0044] The telescopic tube 62 is designed to fix the sleeve 7, keeping it in a relatively static state, and to facilitate retraction when the support plate 8 moves up and down, so as to prevent it from affecting the up and down movement of the support plate 8.

[0045] A first support rod 12 is fixedly connected between the base plate 1 and the fixed plate 6. An adjusting rod is slidably sleeved on the outer periphery of the first support rod 12 corresponding to the support plate 8. The adjusting rod is rotatably connected to the outer periphery of the support plate 8. A third electric telescopic rod is fixedly installed between the adjusting rod and the base plate 1.

[0046] The third electric telescopic rod facilitates the sliding of the adjusting rod around the first support rod 12, thereby causing the support plate 8 to move up and down. The support plate 8 is rotatably connected to the adjusting rod, so it does not affect the rotation of the support plate 8. Furthermore, the first support rod 12 increases the stability of the fixed plate 6.

[0047] A method for using a novel gas chromatograph's sample introduction device includes the following steps: S1: Assembly: Assemble the syringe 10 into the mounting cylinder 102 installed in the socket 82. After the installation of the three sets of syringes 10 is completed, the limiting ring 72 is limited above the cleaning cylinder 9 and the first placement cylinder 21 where the sampling bottle is placed, and the guide plate 73 is limited above the second placement cylinder 31. At this time, the connecting tube 1041 corresponds to the liquid extraction tube 931. S2: Sample injection: The third electric telescopic rod is activated, causing the three syringes 10 to move downwards simultaneously into the first placement cylinder 21, the second placement cylinder 31, and the cleaning cylinder 9. One is used for sampling, one for injection, and the other for cleaning. After the injection is completed, the first electric telescopic rod 81 is activated, causing the guide plate 73 to drive the limiting plate 1032 to move upwards quickly, so that the syringes 10 in the injection process move upwards quickly, and the injection needle is quickly pulled out, realizing the quick pull-out process. S3: Cleaning: After the injection is completed, the syringe 10 is inserted into the cleaning syringe 9, so that the first solenoid valve and the second solenoid valve are connected, so that the cleaning solution is introduced into the storage chamber, and then slowly upward to thoroughly clean the outer and inner walls of the injection needle, and then air dry the injection needle through the air blowing hood 911. S4: Disassembly: The guide plate 73 moves upward and the rotating rod 5 rotates at a certain angle, so that the guide plate 73 is separated from the limiting plate 1032, and the injection cylinder 10 can be disassembled at this time.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A novel gas chromatograph sample injection device, comprising a base plate (1), a rotating rod (5), a fixed plate (6), and a support plate (8), wherein the rotating rod (5) is rotatably connected between the base plate (1) and the fixed plate (6), and the support plate (8) is slidably disposed around the rotating rod (5), and the support plate (8) rotates synchronously with the rotating rod (5), characterized in that: The top surface of the base plate (1) is provided with a sampling placement mechanism, a sample inlet communication mechanism and a cleaning and recovery mechanism arranged in a circular array around the rotating rod (5) as the axis. The sampling placement mechanism and the sample inlet communication mechanism rotate with the rotation of the rotating rod (5). An injection extraction mechanism is provided above the sampling placement mechanism, the sample injection communication mechanism and the cleaning and recovery mechanism on the support plate (8). The injection extraction mechanism is detachably installed on the support plate (8). A limiting mechanism is provided between the support plate (8) and the fixing plate (6) to limit the position of the injection extraction mechanism, and the limiting mechanism is rotatably connected to the rotating rod (5); The limiting mechanism includes a lifting component and a limiting ring (72). The lifting component is disposed above the sample injection communication mechanism. The lifting component and the limiting ring (72) are slidably connected. The injection extraction mechanism is rotatably slidably connected to the lifting component and the limiting ring (72). The lifting component is slidably disposed up and down.

2. The novel gas chromatograph sample introduction device according to claim 1, characterized in that: The sampling placement mechanism includes a first placement plate (2) and a first placement cylinder (21). The first placement cylinder (21) is fixedly arranged in a circumferential array on the top surface of the first placement plate (2). The sample injection and communication mechanism includes a second placement plate (3) and a second placement cylinder (31). The second placement cylinder (31) is arranged in a circumferential array on the top surface of the second placement plate (3), and the second placement cylinder (31) is detachably arranged on the top surface of the second placement plate (3). Both the bottom surfaces of the second placement plate (3) and the first placement plate (2) are provided with support legs (22), which are fixedly connected to the base plate (1).

3. The novel gas chromatograph sample introduction device according to claim 2, characterized in that: A stepper motor (61) is fixedly connected to the top surface of the fixed plate (6). The power output end of the stepper motor (61) is fixedly connected to the rotating rod (5). A gear (51) is fixedly connected to the periphery of the rotating rod (5). A toothed block (32) that meshes with the gear (51) is fixedly connected to the periphery of both the first placement plate (2) and the second placement plate (3).

4. The sample introduction device of a novel gas chromatograph according to claim 3, characterized in that: The cleaning and recycling mechanism includes a cleaning box (11), an air storage tank (111), an air pump (4), a first connecting pipe (41), a cleaning cylinder (9), an air blowing hood (911), a liquid spraying hood (92), and a second liquid storage tank (93). The cleaning box (11) is fixedly connected to the top surface of the base plate (1). The cleaning cylinder (9) is fixedly connected to the top surface of the cleaning box (11), and the cleaning cylinder (9) is correspondingly arranged with the injection extraction mechanism. The second liquid storage tank (93) is fixedly connected to the inner wall of the cleaning box (11). The liquid spraying hood (92) is fixedly connected to the inner wall of the cleaning cylinder (9) near the top. The liquid spraying hood (92) and the second liquid storage tank (93) are fixedly connected. A second connecting pipe (921) is connected to the cleaning cylinder (9). The spray nozzles are arranged in a circular array on the spray hood (92). The top of the cleaning cylinder (9) is fixedly connected to the drying cylinder (91). The air blowing hood (911) is fixedly connected to the drying cylinder (91). The air blowing hood (911) is arranged in a circular array with downward-sloping air jets. The air storage tank (111) is fixedly installed at the center of the top surface of the cleaning box (11). The air pump (4) is fixedly installed on the air storage tank (111). The first connecting pipe (41) is fixedly connected between the air pump (4) and the cleaning cylinder (9). One end of the first connecting pipe (41) is connected to the air blowing hood (911).

5. The sample introduction device of a novel gas chromatograph according to claim 4, characterized in that: The injection extraction mechanism includes an injection cylinder (10), an installation cylinder (102), and a limiting plate (1032). The support plate (8) has an insertion hole (82) for the installation cylinder (102) to be inserted into. A fastening nut (1021) is threaded onto the outer periphery of the installation cylinder (102). A limiting block (1022) is fixedly connected to the installation cylinder (102). A limiting groove (83) is provided on the support plate (8) for the limiting block (1022) to be inserted into. The injection cylinder (10) is slidably inserted into the installation cylinder (102). A limiting rod (101) is fixedly connected to the outer periphery of the injection cylinder (10). A sliding groove is provided on the inner wall of the installation cylinder (102) to slidably connect with the limiting rod (101). An injection needle is fixedly provided at the bottom end of the injection cylinder (10). The top surface of the injection cylinder (10) is fixedly connected to the limiting plate (1032). A sampling rod (103) is slidably inserted into the inner wall of the injection cylinder (10). A power mechanism for driving the sampling rod (103) to slide up and down is provided on the support plate (8). The power mechanism includes a second support rod (84), a second electric telescopic rod (841), and a threaded sleeve (842). The top end of the sampling rod (103) passes through the injection cylinder (10) and is fixedly connected to the threaded rod (1031). The threaded sleeve (842) is threadedly connected to the outer periphery of the threaded rod (1031). The second support rod (84) is fixedly installed on the top surface of the support plate (8) in an L-shaped structure. The second electric telescopic rod (841) is fixedly connected between the second support rod (84) and the threaded sleeve (842).

6. The novel gas chromatograph sample introduction device according to claim 5, characterized in that: A liquid storage cylinder (104) is fixedly connected to the inner wall of the syringe (10). The liquid storage cylinder (104) has a cylindrical structure and an internal liquid storage cavity. A piston (1033) is slidably fitted onto the inner wall of the liquid storage cylinder (104). The piston (1033) is fixedly connected to the sampling rod (103). A connecting tube (1041) communicating with the liquid storage cavity is fixedly connected to one side of the bottom end of the liquid storage cylinder (104). The bottom end of the connecting tube (1041) passes through the syringe (10) and is fixedly connected to a first micro solenoid valve. A cleaning cylinder (9) is provided with a valve that communicates with the first micro solenoid valve. The second miniature solenoid valve is connected to the solenoid valve. The bottom end of the second miniature solenoid valve is fixedly connected to a liquid extraction tube (931). The liquid extraction tube (931) is fixedly connected to the second liquid storage tank (93). The other side of the bottom end of the liquid storage cylinder (104) is fixedly provided with an inlet pipe (1042) that connects the injection cylinder (10) and the liquid storage chamber. The inlet pipe (1042) is provided with a third solenoid valve. The top side of the liquid storage cylinder (104) is fixedly connected with a fourth solenoid valve for connecting the injection cylinder (10) and the liquid storage chamber. The fourth solenoid valve is located above the piston (1033).

7. The novel gas chromatograph sample introduction device according to claim 6, characterized in that: The lifting component includes a guide plate (73) and a first electric telescopic rod (81). The guide plate (73) is slidably disposed between the ends of the limiting ring (72). The first electric telescopic rod (81) is disposed between the support plate (8) and the guide plate (73). The bottom end of the first electric telescopic rod (81) is rotatably connected to the support plate (8), and the top end is fixedly connected to the guide plate (73). The guide plate (73) and the limiting ring (72) form a ring structure and are slidably inserted into the limiting plate (1032).

8. The novel gas chromatograph sample introduction device according to claim 7, characterized in that: The limiting mechanism also includes a telescopic tube (62) and a sleeve (7). The telescopic tube (62) is fixedly disposed between the fixed plate (6) and the sleeve (7), and both the telescopic tube (62) and the sleeve (7) are sleeved around the rotating rod (5). A sliding groove (71) is provided on the outer side of the sleeve (7) for the guide plate (73) to slide up and down. A connecting support rod is fixedly connected between the limiting ring (72) and the sleeve (7).

9. The novel gas chromatograph sample introduction device according to claim 8, characterized in that: A first support rod (12) is fixedly connected between the base plate (1) and the fixed plate (6). An adjusting rod is slidably sleeved on the outer periphery of the first support rod (12) corresponding to the support plate (8). The adjusting rod is rotatably connected to the outer periphery of the support plate (8). A third electric telescopic rod is fixedly installed between the adjusting rod and the base plate (1).

10. A method of using a novel gas chromatograph's instrument injection device, employing the novel gas chromatograph's instrument injection device as described in claim 9, characterized in that: Includes the following steps: S1: Assembly: Assemble the syringe (10) into the mounting cylinder (102) installed in the socket (82). After the installation of the three sets of syringes (10) is completed, the limiting ring (72) is limited above the cleaning cylinder (9) and the first placement cylinder (21) where the sampling bottle is placed, and the guide plate (73) is limited above the second placement cylinder (31). At this time, the connecting tube (1041) corresponds to the liquid extraction tube (931). S2: Sample injection: The third electric telescopic rod is activated, causing the three syringes (10) to move downwards simultaneously into the first placement cylinder (21), the second placement cylinder (31), and the cleaning cylinder (9). One is used for sampling, one for injection, and one for cleaning. After the injection is completed, the first electric telescopic rod (81) is activated, causing the guide plate (73) to drive the limiting plate (1032) to move upwards quickly, causing the syringes (10) in the injection process to move upwards quickly, and the injection needle is quickly pulled out, realizing the quick pull-out process. S3: Cleaning: After the injection is completed, the syringe (10) is inserted into the cleaning syringe (9) so that the first solenoid valve and the second solenoid valve are connected and the cleaning solution is introduced into the storage chamber. Then it is slowly moved upward to thoroughly clean the outer and inner walls of the injection needle, and the injection needle is dried by the air blower (911). S4: Disassembly: The guide plate (73) moves upward and the rotating rod (5) rotates at a certain angle, so that the guide plate (73) is separated from the limiting plate (1032), and the syringe (10) can be disassembled at this time.

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