A sample injection device for a gas chromatograph

Abstract

The utility model discloses a kind of gas chromatograph with sample introduction device, it is related to gas chromatograph technical field, including moving plate and bottom plate, the middle part of the moving plate is provided with through slot, the side fixed mounting of the moving plate has servo motor, the beneficial effect of the utility model is: through the setting of servo motor, screw rod, sleeve block, shaft, gear and rack, after sample is taken, can be moved by servo motor drive screw rod rotation after sleeve block by thread, after gear and rack engage during moving process, drive shaft rotation 180 ° after can be driven by shaft L type plate rotation 180 °, so that the needle of syringe is upwards, air in syringe also upwards subsequently can be pushed by first electric telescopic rod and move up in syringe piston, after air in syringe is discharged, in succession, avoid the situation that air is entered into its interior along with after subsequent sample is placed into gas chromatograph, influence analysis result.

Description

Technical Field

[0001] This utility model relates to the field of gas chromatography technology, specifically to a sample injection device for a gas chromatograph. Background Technology

[0002] Gas chromatography (GC) is a chromatographic analysis instrument that uses gas as the mobile phase. It is typically used to analyze thermally stable organic compounds in soil with boiling points not exceeding 500℃, such as volatile organic compounds, organochlorines, organophosphorus compounds, polycyclic aromatic hydrocarbons, and phthalates. It offers advantages such as speed, efficiency, and high sensitivity, playing a crucial role in soil organic matter research. Samples that can be directly used for GC analysis must be either gaseous or liquid; therefore, soil samples require pretreatment methods to extract the analytes into a solvent before analysis. Soil environmental monitoring refers to determining environmental quality (or pollution level) and its changing trends by measuring representative values ​​of factors affecting soil environmental quality.

[0003] According to a gas chromatograph injection device with application number 202023169584.5, a piston is driven by a telescopic cylinder to move upward in the sampling cylinder, so that the sampling needle can pick up the sample placed in the sample delivery slot. Then, a translation component drives the sliding seat to move horizontally, so that the sampling needle moves above the sample delivery slot. Then, a lifting component drives the sampling needle to move downward, so that the sampling needle is inserted into the sample delivery slot. Then, the telescopic cylinder drives the piston to move downward again, so that the sample flows into the injection port of the gas chromatograph, thus realizing sample delivery and replacing manual operation.

[0004] However, the above-mentioned gas chromatograph injection device has certain shortcomings. During the sampling process in the container, air inevitably enters the sampling tube. If the air is directly sent into the gas chromatograph along with the sample, it will cause injection errors and affect the analysis results. In addition, the existing gas chromatograph injection device is inconvenient to install and remove the syringe, which is also a shortcoming. Therefore, we propose a gas chromatograph injection device. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a gas chromatograph injection device that solves the problems mentioned in the background section.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a sample injection device for a gas chromatograph, comprising a moving plate and a base plate. A through groove is provided in the middle of the moving plate. A servo motor is fixedly installed on one side of the moving plate. A lead screw is fixedly installed on the inner side of the through groove from the output end of the servo motor. A sleeve block is threaded on the outer side of the lead screw. A rotating shaft is rotatably installed in the middle of the sleeve block. A gear is fixedly installed at one end of the rotating shaft. A rack is fixedly installed on one side of the moving plate. The gear meshes with the rack. An L-shaped plate is fixedly installed at the other end of the rotating shaft.

[0007] Furthermore, a mounting base is fixedly installed on one side of the L-shaped plate, and a fixing cover is hinged to one side of the mounting base. Both the mounting base and the fixing cover have mounting grooves inside, and an syringe is installed inside the mounting groove. Each side of the mounting base and the fixing cover has a matching buckle. A first electric telescopic rod is fixedly installed at the bottom of the L-shaped plate, and a push plate connecting buckle is fixedly installed at the output end of the first electric telescopic rod. A connecting groove is opened inside the push plate connecting buckle, and the syringe mates with the connecting groove.

[0008] Furthermore, a mounting frame is fixedly installed in the middle of the base plate, and two second electric telescopic rods are fixedly installed on the top of the mounting frame. The output end of the second electric telescopic rod is fixedly connected to the top of the movable plate.

[0009] Furthermore, a guide rod is fixedly installed inside the through groove, and the sleeve block is slidably connected to the guide rod.

[0010] Furthermore, the base plate has an inlet for a gas chromatograph, the syringe is fitted with the inlet, and a sample storage cylinder is provided on one side of the top of the base plate.

[0011] Furthermore, a control box is provided on the top of the base plate and on one side of the mounting bracket.

[0012] This utility model provides a sample injection device for a gas chromatograph, which has the following advantages:

[0013] 1. The sample injection device of this gas chromatograph, through the configuration of servo motor, lead screw, sleeve, rotating shaft, gear and rack, after the sample is collected, the servo motor drives the lead screw to rotate, which in turn drives the sleeve to move through the thread. During the movement, the gear and rack mesh, which drives the rotating shaft to rotate 180°. The rotating shaft then drives the L-shaped plate to rotate 180°, so that the needle of the syringe is facing upward and the air in the syringe is also facing upward. Then, the first electric telescopic rod pushes the piston in the syringe upward to expel the air in the syringe. This avoids the situation where air enters the gas chromatograph along with the sample after it is placed in the gas chromatograph, affecting the analysis results.

[0014] 2. The injection device for this gas chromatograph is designed with a mounting base, a fixed cover, a snap fastener, a push plate connecting buckle, and a connecting groove. During installation, the fixed cover is separated from the mounting base by snapping open the snap fastener, and then the fixed cover can be flipped to separate it from the mounting base. Subsequently, the syringe can be removed from the mounting groove and connecting groove, which also facilitates the installation of the syringe and makes it convenient and quick to use. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a side view of the present invention;

[0017] Figure 3 This is a rear view of the movable plate of this utility model;

[0018] Figure 4 This is a schematic diagram of the syringe installation according to the present invention;

[0019] Figure 5 This utility model Figure 4 Enlarged view of point A in the image.

[0020] In the diagram: 1. Moving plate; 2. Base plate; 3. Through slot; 4. Servo motor; 5. Lead screw; 6. Rotating shaft; 7. Gear; 8. Rack; 9. L-shaped plate; 10. Mounting base; 11. Fixing cover; 12. Mounting slot; 13. Syringe; 14. Buckle; 15. First electric telescopic rod; 16. Push plate connecting buckle; 17. Connecting slot; 18. Mounting bracket; 19. Second electric telescopic rod; 20. Guide rod; 21. Sleeve block. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Please see Figures 1 to 5This utility model provides a technical solution: a sample injection device for a gas chromatograph, including a moving plate 1 and a base plate 2. A through groove 3 is formed in the middle of the moving plate 1. A servo motor 4 is fixedly installed on one side of the moving plate 1. A lead screw 5 is fixedly installed on the inner side of the through groove 3, extending from the output end of the servo motor 4. A sleeve block 21 is threaded onto the outer side of the lead screw 5. A rotating shaft 6 is rotatably installed in the middle of the sleeve block 21. A gear 7 is fixedly installed at one end of the rotating shaft 6. A rack 8 is fixedly installed on one side of the moving plate 1, with the gear 7 meshing with the rack 8. An L-shaped plate 9 is fixedly installed at the other end of the rotating shaft 6. By turning on the servo motor 4 to drive the lead screw 5 to rotate, the sample can pass through... The thread on the outside of the lead screw 5 drives the sleeve block 21 to move inside the through groove 3. When the sleeve block 21 moves to the right side of the through groove 3, the syringe 13 installed on one side of the L-shaped plate 9 moves to the sampling position. When the sleeve block 21 moves to the middle of the inside of the through groove 3, it drives the rotating shaft 6 and the L-shaped plate 9 to rotate 180° after the gear 7 meshes with the rack 8. This makes the needle of the syringe 13 vertically upward, which facilitates the expulsion of air from the syringe 13. Finally, when the sleeve block 21 moves to the leftmost side of the inside of the base plate 2, the gear 7 meshes with the rack 8 and rotates 180° again, making the needle of the syringe 13 vertically downward. Then, the sample can be injected into the gas chromatograph.

[0023] A mounting base 10 is fixedly installed on one side of the L-shaped plate 9. A fixing cover 11 is hinged to one side of the mounting base 10. Both the mounting base 10 and the fixing cover 11 have mounting grooves 12 inside, and a syringe 13 is installed inside the mounting grooves 12. Each side of the mounting base 10 and the fixing cover 11 has a matching buckle 14. A first electric telescopic rod 15 is fixedly installed at the bottom of the L-shaped plate 9. A push plate connecting buckle 16 is fixedly installed at the output end of the first electric telescopic rod 15. A connecting groove 17 is opened inside the push plate connecting buckle 16, and the syringe 13 mates with the connecting groove 17. The fixing cover 11 is connected by a... The page is connected to the mounting base 10. By flipping the fixing cover 11 to make it rotate around the hinge, the syringe 13 can be easily installed into the mounting groove 12 in the mounting base 10 for positioning. At the same time, the piston rod at the bottom of the syringe 13 is inserted into the connecting groove 17 on the side of the push plate connecting buckle 16. After the fixing cover 11 is reset, the fixing cover 11 is connected and fixed to the mounting base 10 by the buckle 14, and the syringe 13 can be fixed. The installation is convenient and quick. The piston rod and piston of the syringe 13 can be pushed by the first electric telescopic rod 15 and the push plate connecting buckle 16 to perform the suction and release operation.

[0024] A mounting bracket 18 is fixedly installed in the middle of the base plate 2. Two second electric telescopic rods 19 are fixedly installed on the top of the mounting bracket 18. The output end of the second electric telescopic rods 19 is fixedly connected to the top of the moving plate 1. The moving plate 1 can be pushed down by the second electric telescopic rods 19 so that the syringe 13 can extract samples and inject samples into the gas chromatograph.

[0025] A guide rod 20 is fixedly installed inside the through groove 3, and the sleeve block 21 is slidably connected to the guide rod 20. By setting the guide rod 20, the sleeve block 21 can be limited and guided when it is driven to move by the lead screw 5.

[0026] The base plate 2 has an inlet for a gas chromatograph, and the syringe 13 is fitted with the inlet. A sample storage cylinder is provided on one side of the top of the base plate 2. When the servo motor 4 drives the lead screw 5 to rotate and move the sleeve block 21 inside the through groove 3, it can drive the syringe 13 to take a sample in the sample storage cylinder, and can also move the syringe 13 to the inlet for sample delivery.

[0027] A control box is provided on the top of the base plate 2 and on one side of the mounting bracket 18; the control box can control the forward and reverse rotation of the servo motor 4 and the extension and retraction of the first electric telescopic rod 15 and the second electric telescopic rod 19.

[0028] In summary, the injection device for this gas chromatograph is used as follows: First, open the latch 14 on one side of the fixed cover 11 and rotate the fixed cover 11 around the hinge. Then, place the syringe 13 for sampling into the mounting groove 12 inside the mounting base 10, and simultaneously engage the piston rod at the bottom of the syringe 13 into the connecting groove 17 on one side of the push plate connecting buckle 16. After that, reset the fixed cover 11 and connect and fix the fixed cover 11 to the mounting base 10 through the latch 14 to secure the syringe 13. Then, activate the servo motor 4 through the control box to drive the lead screw 5 to rotate. The screw 5, driven by its outer thread, moves the sleeve 21 within the through groove 3. When the sleeve 21 moves to the right side of the through groove 3, the syringe 13 mounted on one side of the L-shaped plate 9 moves above the sample storage cylinder. Then, the control box activates the second electric telescopic rod 19, pushing the moving plate 1 downwards, causing the needle of the syringe 13 to insert into the sample cylinder. Next, the control box activates the first electric telescopic rod 15, causing it to retract and pull the piston rod of the syringe 13, thus drawing the sample from the sample storage cylinder into the syringe 13. Finally, the control box controls the second electric telescopic rod 19 to reset, driving the moving plate 1 downwards. The moving plate 1 moves upward, causing the needle of the syringe 13 to exit from the sample storage cylinder. Then, the servo motor 4 drives the lead screw 5 to rotate, moving the sleeve block 21 to the center of the inner side of the through groove 3. Simultaneously, as the sleeve block 21 moves, the gear 7 meshes with the rack 8, causing the rotating shaft 6 and L-shaped plate 9 to rotate 180°, thus making the needle of the syringe 13 vertically upward. At this point, the control box opens the first electric telescopic rod 15, pushing it forward a certain distance, which in turn causes the push plate connecting buckle 16 to push the piston rod of the syringe 13 forward a certain distance, expelling the air from the syringe 13. Finally, the servo motor 4 is activated again to drive the lead screw 5. After the rod 5 rotates, it drives the sleeve block 21 to move to the leftmost side of the inner side of the base plate 2, so that the gear 7 meshes with the rack 8 and then rotates 180°, so that the needle of the syringe 13 is vertically downward. At the same time, the needle of the syringe 13 moves to the upper part of the injection port of the gas chromatograph. Then, the second electric telescopic rod 19 is opened through the control box to push the moving plate 1 down, so that the needle of the syringe 13 passes through the injection port and is inserted into the gas chromatograph. Finally, the first electric telescopic rod 15 is opened to push the piston rod and piston, so that the sample in the syringe 13 is sent into the gas chromatograph, and the injection is completed.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sample injection device for a gas chromatograph, comprising a movable plate (1) and a base plate (2), characterized in that: The moving plate (1) has a through groove (3) in the middle. A servo motor (4) is fixedly installed on one side of the moving plate (1). The output end of the servo motor (4) extends to the inside of the through groove (3) and a lead screw (5) is fixedly installed. A sleeve block (21) is threaded on the outside of the lead screw (5). A rotating shaft (6) is rotatably installed in the middle of the sleeve block (21). A gear (7) is fixedly installed at one end of the rotating shaft (6). A rack (8) is fixedly installed on one side of the moving plate (1). The gear (7) meshes with the rack (8). An L-shaped plate (9) is fixedly installed at the other end of the rotating shaft (6).

2. The sample injection device for a gas chromatograph according to claim 1, characterized in that: A mounting base (10) is fixedly installed on one side of the L-shaped plate (9). A fixing cover (11) is hinged to one side of the mounting base (10). Both the mounting base (10) and the fixing cover (11) have mounting grooves (12) inside. A syringe (13) is installed inside the mounting groove (12). Each side of the mounting base (10) and the fixing cover (11) has a matching buckle (14). A first electric telescopic rod (15) is fixedly installed at the bottom of the L-shaped plate (9). A push plate connecting buckle (16) is fixedly installed at the output end of the first electric telescopic rod (15). A connecting groove (17) is opened inside the push plate connecting buckle (16). The syringe (13) cooperates with the connecting groove (17).

3. The sample injection device for a gas chromatograph according to claim 1, characterized in that: A mounting bracket (18) is fixedly installed in the middle of the base plate (2), and two second electric telescopic rods (19) are fixedly installed on the top of the mounting bracket (18). The output end of the second electric telescopic rod (19) is fixedly connected to the top of the movable plate (1).

4. The sample injection device for a gas chromatograph according to claim 1, characterized in that: A guide rod (20) is fixedly installed inside the through groove (3), and the sleeve block (21) is slidably connected to the guide rod (20).

5. The sample injection device for a gas chromatograph according to claim 2, characterized in that: The bottom plate (2) has an inlet for a gas chromatograph, the syringe (13) is fitted with the inlet, and a sample storage cylinder is provided on one side of the top of the bottom plate (2).

6. The sample injection device for a gas chromatograph according to claim 1, characterized in that: A control box is provided on the top of the base plate (2) and on one side of the mounting bracket (18).

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