Sample pretreatment structure for gas chromatographic analyzer

Abstract

The invention relates to the technical field of gas chromatographic analyzers, in particular to a sample pretreatment structure for a gas chromatographic analyzer, which comprises a preheating box on an analyzer main body, a partition plate for dividing the preheating box into a left cavity and a right cavity is integrally connected to the preheating box, and a conveying plate for conveying samples is arranged on the partition plate; a conveying assembly for quantitatively conveying samples is mounted in the left cavity, and a heating assembly for uniformly heating the samples is mounted in the right cavity. Falling samples are weighed through the weighing table, the supporting table extends to the fixed table through downward movement of the movable rod, the quantitative samples are conveyed into the barrel through the conveying table, and then the sample analysis accuracy is improved; a sample is supported through the four barrels, the second annular plate can drive the barrels to rotate when rotating, the first rotating shaft and the second rotating shaft drive the stirring rods to stir the sample in the barrels when rotating, and the sample preheating efficiency is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of gas chromatograph analyzers, and in particular to a sample pretreatment structure for gas chromatograph analyzers. Background Art

[0002] Gas chromatograph is based on a system composed of different substances in the stationary phase and the mobile phase, that is, the chromatographic column has different distribution coefficients to separate the components of the sample gas, and then the detector is used to convert the chromatographic peaks of each component gas into electrical signals, which are converted into voltage or current output by the electronic amplifier. In the gas chromatograph, when testing the sample, it is usually necessary to heat the sample to a certain temperature to produce volatile gas.

[0003] According to the gas chromatograph sample preheating device disclosed in the announcement number CN221351342U, it includes a sample heating component, a material pushing component and a preheating component, wherein the sample heating component includes a sample storage shell, a heating component and a ventilation component. The residual heat of the detected sample is used to preheat the subsequent sample to be detected, thereby improving the detection efficiency of the analysis.

[0004] When heating the sample in the above method, the sample is placed on the feed tray, and the feed tray is extended to the heating component and the pre-heating component. When the sample is placed on the feed tray, the weight of the sample is not quantified, and the heating time is different for different sample weights, which affects the accuracy of gas analysis after preheating the sample. When the sample is piled on the feed tray for heating, the sample cannot be dynamically heated, which causes the upper and lower samples in the heating component to be heated to different degrees, thereby affecting the efficiency of sample analysis. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that it is difficult to conduct quantitative analysis of samples in the prior art, and to propose a sample pretreatment structure for a gas chromatograph analyzer.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A sample pretreatment structure for a gas chromatograph analyzer comprises a preheating box on the analyzer body, the preheating box is integrally connected with a partition which divides the preheating box into a left chamber and a right chamber, and the partition is provided with a conveying plate for conveying samples, a conveying component for quantitatively conveying samples is installed in the left chamber, and a heating component for uniformly heating samples is installed in the right chamber.

[0008] Preferably, the conveying assembly includes a controller and a conveying platform arranged on the preheating box, a concentrically arranged guide frame and a sleeve are fixedly installed in the left cavity, four circumferentially distributed deflection rods are movably installed in the guide frame, a moving rod is slidably sleeved in the sleeve, and a support platform for supporting the sample is fixedly installed on the moving rod, a weighing platform electrically connected to the controller and for weighing the sample is provided on the support platform, a connecting rod connected to the moving rod is slidably sleeved in the deflection rod, a spring is welded between the connecting rod and the deflection rod, a pressure sensor movably abutting against the moving rod is fixedly installed in the sleeve, a driving assembly for driving the connecting rod is installed in the sleeve, and a pushing assembly for pushing the sample to fall is installed on the preheating box.

[0009] Preferably, the support platform and the movable rod extend to the upper end position outside the sleeve, the end of the deflection rod away from the connecting rod is connected to the pin of the guide frame, the spring is welded to the side position of the connecting rod extending to the inside of the deflection rod, and the end of the connecting rod away from the deflection rod is connected to the pin of the movable rod.

[0010] Preferably, the driving assembly includes a slider slidably sleeved in a sleeve, a telescopic rod connected to the slider is fixedly mounted on the sleeve, a traction rod is connected between the slider and the connecting rod, both ends of the traction rod are respectively connected to the slider and the middle end pin of the connecting rod, the deflection rod is provided with a guide long hole for guiding the traction rod, a guide end is fixedly mounted on the connecting rod, and the deflection rod is provided with a slot for guiding the guide end.

[0011] Preferably, the pushing assembly includes a fixed table fixedly mounted on the preheating box and supporting the support table, a motor 1 is fixedly mounted on the preheating box, and an output end of the motor 1 is fixedly connected to a bidirectional screw rod rotatably mounted on the preheating box, a sliding sleeve on the bidirectional screw rod is provided with two matching nuts, a sliding sleeve inside the preheating box is provided with a pressure plate for applying pressure to the sample, and a pressure rod is connected between the pressure plate and the two nuts.

[0012] Preferably, the fixing platform is an L-shaped structure, the bidirectional screw rod and the pressure rod are horizontally arranged on one side of the supporting platform, and the two ends of the pressure rod are respectively connected to the nut and the pin shaft at the middle end of the pressure plate.

[0013] Preferably, the heating component includes a heating cylinder fixedly installed in the right cavity and heating the sample, a hydraulic cylinder is fixedly installed in the right cavity, and a sealing cover corresponding to the heating cylinder is fixedly connected to the output end of the hydraulic cylinder, a sliding sleeve in the sealing cover is provided with a ring plate 1, a sliding sleeve in the heating cylinder is provided with a ring plate 2, four circumferentially distributed cylinders for storing samples are fixedly installed on the ring plate 2, a rotating component for driving the ring plates 1 and 2 to rotate is installed on the sealing cover, and a stirring component for stirring the sample is installed on the ring plate 1.

[0014] Preferably, the rotating assembly includes annular teeth fixedly mounted on ring plate one and ring plate two, motor two is fixedly mounted on the sealing cover, and the output end of motor two is fixedly connected to a driving rod rotatably mounted on the sealing cover, and a gear meshingly connected to the annular teeth is fixedly mounted on the driving rod.

[0015] Preferably, the stirring assembly includes two motors three fixedly mounted on a ring plate one, and the output end of the motor three is fixedly connected to a rotating shaft one extending into the cylinder body, a rotating shaft two is rotatably mounted on the ring plate one and is transmission-connected to the rotating shaft one, and stirring rods for stirring the sample are fixedly mounted on the rotating shaft one and the rotating shaft two, and a transmission belt is connected between the rotating shaft one and the rotating shaft two via a coupling.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. The present invention weighs the falling sample through a weighing platform, and extends the support platform to the fixed platform by moving the moving rod downward. The pressure sensor senses that the pressure exceeds the specified threshold, so that the pressure plate can apply pressure to the sample on the support platform, so that the quantitative sample is transported into the cylinder through the conveying platform. By achieving quantitative transportation of the sample, the accuracy of sample analysis is improved.

[0018] 2. The present invention supports the sample through four cylinders. The ring plate 2 can drive the cylinder to rotate when rotating. The rotating shaft 1 and the rotating shaft 2 drive the stirring rod to stir the sample in the cylinder when rotating, so that the sample can be fully heated in the heating cylinder, effectively improving the efficiency of sample preheating. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a sample pretreatment structure for a gas chromatograph proposed by the present invention;

[0020] Figure 2 A cross-sectional view of a preheating box of a sample pretreatment structure for a gas chromatograph proposed by the present invention;

[0021] Figure 3 A cross-sectional view of a guide frame of a sample pretreatment structure for a gas chromatograph proposed by the present invention;

[0022] Figure 4 A cross-sectional view of a sample pretreatment structure for a gas chromatograph proposed by the present invention;

[0023] Figure 5 A top-sectional view of a sample pretreatment structure for a gas chromatograph analyzer proposed by the present invention;

[0024] Figure 6A top sectional view of a sealing cover of a sample pretreatment structure for a gas chromatograph proposed by the present invention;

[0025] Figure 7 The present invention is a side sectional view of a sample pretreatment structure for a gas chromatograph.

[0026] In the figure: 1. preheating box; 2. partition; 3. conveying plate; 4. guide frame; 5. sleeve; 6. deflection rod; 7. connecting rod; 8. spring; 9. moving rod; 10. support platform; 11. weighing platform; 12. pressure sensor; 13. telescopic rod; 14. slider; 15. traction rod; 16. heating cylinder; 17. hydraulic cylinder; 18. motor one; 19. two-way screw; 20. nut; 21. pressure plate; 22. pressure rod; 23. fixed platform; 24. sealing cover; 25. ring plate one; 26. ring plate two; 27. cylinder; 28. ring-shaped teeth; 29. ​​motor two; 30. driving rod; 31. gear; 32. motor three; 33. rotating shaft one; 34. rotating shaft two; 35. transmission belt; 36. stirring rod. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] Reference Figure 1-Figure 7 A sample pretreatment structure for a gas chromatograph analyzer comprises a preheating box 1 on the analyzer body, a partition 2 is integrally connected to the preheating box 1 to divide the preheating box 1 into a left chamber and a right chamber, and a conveying plate 3 for conveying the sample is provided on the partition 2;

[0029] A delivery component for quantitative delivery of samples is installed in the left cavity;

[0030] The conveying assembly includes a controller and a conveying platform arranged on the preheating box 1. The controller can open and close the conveying platform. This technical solution is a prior art and will not be elaborated on here. A concentrically arranged guide frame 4 and a sleeve 5 are fixedly installed in the left cavity. Four circumferentially distributed deflection rods 6 are movably installed in the guide frame 4. A moving rod 9 is slidably sleeved in the sleeve 5, and a support platform 10 for supporting the sample is fixedly installed on the moving rod 9;

[0031] The support platform 10 is provided with a weighing platform 11 which is electrically connected to the controller and is used to weigh the sample. The weighing platform 11 can weigh the weight of the sample and transmit the weighed weight value to the controller, thereby monitoring the sample weight in real time. A connecting rod 7 connected to the moving rod 9 is provided in a sliding sleeve inside the deflection rod 6. A spring 8 is welded between the connecting rod 7 and the deflection rod 6. The support platform 10 and the moving rod 9 extend to the upper end position outside the sleeve 5. The deflection rod 6 guides the connecting rod 7, and the sleeve 5 guides the moving rod 9, thereby enabling the moving rod 9 to smoothly pull the support platform 10 when moving.

[0032] One end of the deflection rod 6 away from the connecting rod 7 is connected to the guide frame 4 with a pin, a spring 8 is welded to the connecting rod 7 and extends to one side of the deflection rod 6, one end of the connecting rod 7 away from the deflection rod 6 is connected to the moving rod 9 with a pin, and a pressure sensor 12 is fixedly installed in the sleeve 5 to resist the moving rod 9;

[0033] A driving assembly for driving the connecting rod 7 is installed in the sleeve 5;

[0034] The driving assembly includes a slider 14 slidably sleeved in the sleeve 5, a telescopic rod 13 connected to the slider 14 is fixedly installed on the sleeve 5, a traction rod 15 is connected between the slider 14 and the connecting rod 7, and the two ends of the traction rod 15 are respectively connected to the slider 14 and the middle end pin of the connecting rod 7. When the sample on the weighing platform 11 reaches the specified weight, the conveying platform stops conveying the sample, and the output end of the telescopic rod 13 is extended and retracted to drive the slider 14 to slide in the sleeve 5. The slider 14 pulls the connecting rod 7 through the traction rod 15, so that the connecting rod 7 can drive the support platform 10 to disconnect from the conveying platform and extend to the fixed platform 23 when moving downward;

[0035] The deflection rod 6 is provided with a guide long hole for guiding the traction rod 15, the connecting rod 7 is fixedly provided with a guide end, and the deflection rod 6 is provided with a slot for guiding the guide end. The moving direction of the connecting rod 7 can be limited by the mutual cooperation between the guide end and the guide long hole;

[0036] A pushing component for pushing the sample down is installed on the preheating box 1;

[0037] The pushing assembly includes a fixed platform 23 fixedly mounted on the preheating box 1 and supporting the supporting platform 10. A motor 18 is fixedly mounted on the preheating box 1, and the output end of the motor 18 is fixedly connected to a bidirectional screw rod 19 rotatably mounted on the preheating box 1. Two matching nuts 20 are slidably sleeved on the bidirectional screw rod 19. The preheating box 1 guides the pressure rod 22, thereby limiting the moving direction of the nut 20.

[0038] A pressure plate 21 for applying pressure to the sample is provided on the sliding sleeve in the preheating box 1, and a pressure rod 22 is connected between the pressure plate 21 and the two nuts 20. The fixed platform 23 is an L-shaped structure. The bidirectional screw 19 and the pressure rod 22 are horizontally arranged on one side of the support platform 10. The two ends of the pressure rod 22 are respectively connected to the nuts 20 and the middle end pins of the pressure plate 21.

[0039] When the moving rod 9 slides in the sleeve 5, it contacts the pressure sensor 12. The pressure sensor 12 senses that the pressure exceeds the specified threshold and immediately sends an opening command to the motor 18, so that the pressure plate 21 can push the sample on the weighing platform 11 to the conveying plate 3 for transmission when moving. By transmitting a certain amount of sample into the cylinder 27, the accuracy of sample analysis is improved.

[0040] A heating component for uniformly heating the sample is installed in the right chamber;

[0041] The heating assembly includes a heating cylinder 16 fixedly installed in the right cavity and used to heat the sample, a hydraulic cylinder 17 fixedly installed in the right cavity, and a sealing cover 24 corresponding to the heating cylinder 16 fixedly connected to the output end of the hydraulic cylinder 17, a ring plate 1 25 is provided on the sliding sleeve of the sealing cover 24, and a ring plate 26 is provided on the sliding sleeve of the heating cylinder 16, and four circumferentially distributed cylinders 27 for storing the sample are fixedly installed on the ring plate 26. By arranging four cylinders 27 on the ring plate 26, the four cylinders 27 can heat four groups of samples synchronously at the same time, which can effectively improve the accuracy of the main analysis of the analyzer;

[0042] The sealing cover 24 is provided with a rotating assembly for driving the ring plate 1 25 and the ring plate 2 26 to rotate;

[0043] The rotating assembly includes an annular tooth 28 fixedly mounted on the ring plate 1 25 and the ring plate 2 26, a motor 29 fixedly mounted on the sealing cover 24, and a driving rod 30 rotatably mounted on the sealing cover 24 is fixedly connected to the output end of the motor 29, and a gear 31 meshing and connected with the annular tooth 28 is fixedly mounted on the driving rod 30. When the sample needs to be heated, the sealing cover 24 drives the gear 31 to correspond to the annular tooth 28 on the ring plate 26 when it moves downward. After the motor 29 is powered on, it can drive the ring plate 1 25 and the ring plate 26 to rotate. When the ring plate 26 rotates, it can drive the four cylinders 27 to rotate, thereby realizing uniform heating of the sample in the cylinder 27;

[0044] A stirring assembly for stirring the sample is installed on the ring plate 25;

[0045] The stirring assembly includes two motors 32 fixedly mounted on the ring plate 1 25, and the output end of the motor 32 is fixedly connected to a rotating shaft 1 33 extending into the cylinder 27, a rotating shaft 2 34 is rotatably mounted on the ring plate 1 25 and is transmission-connected to the rotating shaft 1 33, and a stirring rod 36 for stirring the sample is fixedly mounted on the rotating shaft 1 33 and the rotating shaft 2 34, and a transmission belt 35 is connected between the rotating shaft 1 33 and the rotating shaft 2 34 through a coupling;

[0046] The output end of the motor three 32 drives the rotating shaft one 33 to rotate, so that the stirring rod 36 can fully stir the sample in the cylinder 27 during rotation, so that the sample in the cylinder 27 can be evenly heated, effectively improving the efficiency of preheating the sample;

[0047] It should be noted that the specific models and specifications of the controller, conveying platform, weighing platform 11, pressure sensor 12, telescopic rod 13, motor 18, heating tube 16, hydraulic cylinder 17, motor 29, and motor 32 need to be selected and determined according to the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it is not repeated here.

[0048] The present invention can be explained by the following operation mode:

[0049] The conveying platform conveys the sample and makes the sample fall onto the weighing platform 11. The weighing platform 11 weighs the falling sample and transmits the weight signal of the sample to the control console. When the weight of the sample on the weighing platform 11 reaches a certain value, the controller immediately sends a closing command to the conveying platform and sends a command to the telescopic rod 13 at the same time.

[0050] The output end of the telescopic rod 13 contracts and drives the slider 14 to slide in the sleeve 5. The slider 14 pulls the traction rod 15 when moving. The traction rod 15 applies pressure to the connecting rod 7 when deflecting, so that the connecting rod 7 slides in the deflection rod 6 after being stressed. The spring 8 is stressed, and the connecting rod 7 drives the deflection rod 6 to deflect in the guide frame 4. After the four connecting rods 7 are deflected, the moving rod 9 is driven to deflect in the sleeve 5. The moving rod 9 drives the support platform 10, the weighing platform 11, and the sample to move downward synchronously;

[0051] The moving rod 9 can pressurize the pressure sensor 12 when it moves downward. When the pressure sensor 12 senses that the pressure exceeds the specified threshold, it immediately sends a signal to the controller. At the same time, the support platform 10 extends to the fixed platform 23, and the controller sends an opening signal to the motor 18.

[0052] The output end of the motor 18 drives the bidirectional screw 19 to rotate, and the bidirectional screw 19 drives the two nuts 20 to move toward or in opposite directions when rotating;

[0053] When the two nuts 20 are facing each other, they pull the pressure rod 22. The position difference generated when the pressure rod 22 is deflected can enable the pressure rod 22 to apply pressure. When the pressure rod 22 moves, it pushes the sample off the support table 10 and falls into one of the cylinders 27 through the conveying plate 3.

[0054] After the sample on the support platform 10 is dropped, the pressure plate 21 first returns to the initial position, and the output end of the telescopic rod 13 is extended to drive the support platform 10 back to the initial position. At the same time, the output end of the motor 29 drives the driving rod 30 to rotate, and the driving rod 30 drives the gear 31 to pull the meshing ring-shaped teeth 28. When the ring-shaped teeth 28 rotate, the other cylinder 27 can be moved to the lower end of the conveying plate 3;

[0055] Repeat the above steps to make four groups of samples fall into four cylinders 27 respectively;

[0056] The output end of the hydraulic cylinder 17 is extended and retracted to drive the sealing cover 24 to move downward to seal the heating cylinder 16;

[0057] The heating cylinder 16 heats the sample after being energized;

[0058] The output end of the second motor 29 drives the driving rod 30 to rotate, and the driving rod 30 drives the gear 31 to pull the two meshing ring teeth 28, and the ring teeth 28 drive the ring plate 1 25 and the ring plate 2 26 to rotate in the sealing cover 24 and the heating cylinder 16 respectively. When the ring plate 26 rotates, it drives the cylinder 27 and the sample to rotate evenly;

[0059] The output end of motor three 32 drives shaft one 33 to rotate, and shaft one 33 drives shaft two 34 to rotate through transmission belt 35. When shaft one 33 and shaft two 34 rotate, they drive stirring rod 36 to stir the sample in cylinder 27. The gas generated during the heating process of the sample can flow into the main body of the analyzer for analysis.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sample pretreatment structure for a gas chromatograph analyzer, comprising a preheating box (1) on the analyzer body, characterized in that: The preheating box (1) is integrally connected with a partition (2) for dividing the preheating box (1) into a left chamber and a right chamber, and a conveying plate (3) for conveying samples is provided on the partition (2), a conveying component for quantitatively conveying samples is installed in the left chamber, and a heating component for uniformly heating samples is installed in the right chamber.

2. The sample pretreatment structure for gas chromatograph according to claim 1, characterized in that: The conveying assembly comprises a controller and a conveying platform arranged on the preheating box (1); a concentrically arranged guide frame (4) and a sleeve (5) are fixedly installed in the left cavity; four circumferentially distributed deflection rods (6) are movably installed in the guide frame (4); a moving rod (9) is slidably sleeved in the sleeve (5); a support platform (10) for supporting the sample is fixedly installed on the moving rod (9); a weighing platform (11) electrically connected to the controller and for weighing the sample is provided on the support platform (10); a connecting rod (7) connected to the moving rod (9) is slidably sleeved in the deflection rod (6); a spring (8) is welded between the connecting rod (7) and the deflection rod (6); a pressure sensor (12) movably abutting against the moving rod (9) is fixedly installed in the sleeve (5); a driving assembly for driving the connecting rod (7) is installed in the sleeve (5); and a pushing assembly for pushing the sample to fall is installed on the preheating box (1).

3. The sample pretreatment structure for gas chromatograph according to claim 2, characterized in that: The support platform (10) and the moving rod (9) extend to the upper end position outside the sleeve (5); the end of the deflection rod (6) away from the connecting rod (7) is connected to the pin of the guide frame (4); the spring (8) is welded to the connecting rod (7) and extends to a side position inside the deflection rod (6); the end of the connecting rod (7) away from the deflection rod (6) is connected to the pin of the moving rod (9).

4. The sample pretreatment structure for gas chromatograph according to claim 2, characterized in that: The driving assembly comprises a slider (14) slidably sleeved in a sleeve (5); a telescopic rod (13) connected to the slider (14) is fixedly mounted on the sleeve (5); a traction rod (15) is connected between the slider (14) and the connecting rod (7); two ends of the traction rod (15) are respectively connected to the slider (14) and the middle end pin of the connecting rod (7); a guide long hole for guiding the traction rod (15) is provided on the deflection rod (6); a guide end is fixedly mounted on the connecting rod (7); and a clamping groove for guiding the guide end is provided on the deflection rod (6).

5. The sample pretreatment structure for gas chromatograph according to claim 2, characterized in that: The pushing assembly comprises a fixed platform (23) fixedly mounted on the preheating box (1) and supporting the supporting platform (10); a motor (18) is fixedly mounted on the preheating box (1), and the output end of the motor (18) is fixedly connected to a bidirectional screw rod (19) rotatably mounted on the preheating box (1); a sliding sleeve on the bidirectional screw rod (19) is provided with two matching nuts (20); a sliding sleeve inside the preheating box (1) is provided with a pressure plate (21) for applying pressure to the sample, and a pressure rod (22) is connected between the pressure plate (21) and the two nuts (20).

6. The sample pretreatment structure for gas chromatograph according to claim 5, characterized in that: The fixing platform (23) is an L-shaped structure. The bidirectional screw rod (19) and the pressure rod (22) are horizontally arranged on one side of the support platform (10). The two ends of the pressure rod (22) are respectively connected to the nut (20) and the middle end pin of the pressure plate (21).

7. The sample pretreatment structure for gas chromatograph according to claim 1, characterized in that: The heating component comprises a heating cylinder (16) fixedly installed in the right cavity and used to heat the sample, a hydraulic cylinder (17) fixedly installed in the right cavity, and a sealing cover (24) corresponding to the heating cylinder (16) is fixedly connected to the output end of the hydraulic cylinder (17), a sliding sleeve in the sealing cover (24) is provided with a ring plate 1 (25), and a sliding sleeve in the heating cylinder (16) is provided with a ring plate 2 (26), and four circumferentially distributed cylinders (27) for storing the sample are fixedly installed on the ring plate 2 (26), a rotating component for driving the ring plate 1 (25) and the ring plate 2 (26) to rotate is installed on the sealing cover (24), and a stirring component for stirring the sample is installed on the ring plate 1 (25).

8. The sample pretreatment structure for gas chromatograph according to claim 7, characterized in that: The rotating assembly comprises an annular tooth (28) fixedly mounted on annular plate 1 (25) and annular plate 2 (26); a motor 2 (29) is fixedly mounted on the sealing cover (24); an output end of the motor 2 (29) is fixedly connected to a driving rod (30) rotatably mounted on the sealing cover (24); a gear (31) meshingly connected to the annular tooth (28) is fixedly mounted on the driving rod (30).

9. The sample pretreatment structure for gas chromatograph according to claim 7, characterized in that: The stirring assembly comprises two motors three (32) fixedly mounted on a ring plate one (25), and the output end of the motor three (32) is fixedly connected to a rotating shaft one (33) extending into the cylinder (27), a rotating shaft two (34) is rotatably mounted on the ring plate one (25) and is transmission-connected to the rotating shaft one (33), and a stirring rod (36) for stirring the sample is fixedly mounted on the rotating shaft one (33) and the rotating shaft two (34), and a transmission belt (35) is connected between the rotating shaft one (33) and the rotating shaft two (34) via a coupling.

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