Sampling device and surface acoustic wave gas chromatograph

Abstract

The utility model belongs to the technical field of gas chromatography detection, and discloses a sampling device and a surface acoustic wave gas chromatograph. The sampling device comprises a positioning disc, a first mechanism and a second mechanism, wherein the positioning disc is provided with a plurality of placing grooves, and the placing grooves are used for placing sample bottles; the first mechanism is in transmission connection with the positioning disc and is used for driving the positioning disc to lift; the second mechanism is in transmission connection with the first mechanism or the positioning disc and is used for driving the positioning disc to move, so that the sample bottles in the placement grooves are sequentially aligned with the detection opening, and samples contained in the sample bottles can enter the detection opening through volatilization. According to the utility model, automatic sampling can be realized, the operation efficiency is improved, and the influence of manual intervention on the reliability and stability of a detection result is avoided; aiming at a continuous sampling link of multiple samples, errors caused by manual operation can be avoided, and the operation complexity is reduced.

Description

Sampling device and surface acoustic wave gas chromatograph Technical Field

[0001] This utility model relates to the field of gas chromatography detection technology, and in particular to a sampling device and a surface acoustic wave gas chromatograph. Background Technology

[0002] Gas chromatographs are commonly used analytical instruments widely applied in environmental monitoring, industrial production, and food safety. Among them, surface acoustic wave (SAW) gas chromatographs, due to their small size, fast detection speed, and high sensitivity, are gradually becoming a powerful tool for rapid on-site detection. As an important piece of equipment in the field of analytical chemistry, the accuracy and efficiency of the sampling process in SAW gas chromatographs directly affect the reliability of the detection results. Currently, existing SAW gas chromatograph sampling devices have the following problems in use.

[0003] 1. High reliance on manual intervention, low operational efficiency, and low degree of automation.

[0004] The existing sampling process requires manually placing sample vials in a separate heating device for pretreatment (such as volatilization or derivatization). After the sample is fully vaporized, it is then manually transferred to the chromatograph injection port. This process is not only time-consuming (increasing single-sample processing time by approximately 30%-50%), but also prone to human error due to differences in operator skill (such as sample contamination or loss of volatile components due to transfer delays). Furthermore, manual contact with high-temperature components (such as heating modules) poses a risk of burns and violates laboratory safety regulations.

[0005] 2. Insufficient capacity for continuous processing of multiple samples

[0006] Existing sampling devices often require frequent sample bottle changes when continuously sampling multiple samples, which is cumbersome and prone to errors. Summary of the Invention

[0007] The purpose of this invention is to provide a sampling device and a surface acoustic wave gas chromatograph for automated sampling, improving operational efficiency, avoiding manual intervention, and ensuring the reliability and stability of test results; for continuous sampling of multiple samples, it avoids errors caused by manual operation and reduces the complexity of operation.

[0008] Sampling device, including:

[0009] A positioning plate, wherein the positioning plate is provided with multiple placement slots for placing sample bottles;

[0010] A first mechanism is connected to the positioning disk via a transmission, and the first mechanism is used to drive the positioning disk to rise and fall.

[0011] The second mechanism is connected to the first mechanism or the positioning disk in a transmission manner. The second mechanism is used to drive the positioning disk to move so that the sample bottles in the placement slot are aligned with the detection port in sequence, and the sample contained in the sample bottle can enter the detection port through evaporation.

[0012] As an alternative to the sampling device, the inner wall of the placement slot is provided with a plurality of fixing components, which clamp and fix the outer wall of the sample bottle by elastic action.

[0013] As an alternative to the sampling device, the fixing assembly includes a clamp and an elastic element. One side of the clamp is provided with anti-slip texture, and the other side of the clamp is connected to the elastic element. The end of the elastic element away from the clamp is connected to the inner wall of the placement groove.

[0014] As an alternative to the sampling device, the clamp is provided with a positioning sleeve, and part of the structure of the elastic element is located inside the positioning sleeve.

[0015] As an alternative to the sampling device, the bottom of the placement slot is equipped with a heating element, and the sample bottle is placed on the heating element.

[0016] As an alternative to the sampling device, the first mechanism includes a first driving member, which is connected to the positioning disk in a driving manner.

[0017] As an alternative to the sampling device, a plurality of the placement slots are arranged circumferentially on the positioning disk, and the second mechanism is used to drive the first mechanism or the positioning disk to rotate the positioning disk.

[0018] As an alternative to the sampling device, the second mechanism includes a second driving member, a first gear, a second gear, and a rotating shaft. The second driving member is connected to the first gear in a transmission manner, the first gear meshes with the second gear in a transmission manner, the rotating shaft is connected to the second gear, and the rotating shaft is connected to the positioning disk or the first mechanism in a transmission manner.

[0019] As an alternative to the sampling device, the second mechanism further includes a turntable, one side of which is connected to the positioning plate or the first mechanism, and the other side of which is connected to the rotating shaft; the sampling device further includes a base plate, the rotating shaft passes through the base plate, a slider is provided on the surface of the turntable opposite to the base plate, a groove is provided on the base plate, and the slider slides in the groove.

[0020] A surface acoustic wave gas chromatograph includes a main body and a sampling device as described in any of the above embodiments, wherein the detection port is located on the main body.

[0021] To achieve this objective, the present invention adopts the following technical solution:

[0022] Beneficial effects:

[0023] In the first aspect of this invention, a first mechanism enables automatic lifting and lowering of the sample vial. When gas is released from the sample vial, the first mechanism precisely lifts the positioning plate and the sample vial to the detection port, ensuring accurate alignment between the vial opening and the detection port. This significantly improves the detection effect of the surface acoustic wave gas chromatograph and avoids problems such as misalignment and sample spillage that may occur when manually placing the sample vial, thus improving the accuracy and reliability of the detection. It also saves time and effort for manual operation, making the entire sampling process more efficient and convenient. On the other hand, a second mechanism enables continuous automatic sampling of multiple sample vials without the need for frequent manual replacement, greatly improving sampling efficiency. Especially when multiple samples need to be tested, the sampling task can be completed quickly and orderly, reducing waiting time and improving the overall efficiency of the detection process. This allows the portable headspace sampling device to better meet the needs of rapid on-site testing. This sampling device achieves automated sampling, improves operational efficiency, avoids manual intervention, and prevents interference with the reliability and stability of the test results. For continuous sampling of multiple samples, it also avoids human error and reduces operational complexity.

[0024] In a second aspect of this invention, the surface acoustic wave gas chromatograph based on this sampling device can avoid manual intervention and improve the level of automation and detection efficiency. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the surface acoustic wave gas chromatograph provided in an embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of the sampling device provided in an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of the structure of the positioning disk, fixing component and sampling bottle provided in the embodiment of this utility model;

[0028] Figure 4 is a structural schematic diagram of the fixing component provided in an embodiment of the present utility model;

[0029] Figure 5 is a partial cross-sectional view of the base plate and the second mechanism provided in the embodiment of this utility model.

[0030] In the picture:

[0031] 1. Base plate; 2. Support leg; 3. Support frame; 4. Bolt; 5. Main body; 6. Detection port; 7. First mechanism; 71. Fixing component; 711. Clamping plate; 712. Positioning sleeve; 713. Elastic element; 714. Anti-slip texture; 72. Positioning plate; 73. Sample bottle; 74. Placement slot; 75. First driving component; 76. Heating component; 8. Control panel; 9. Second mechanism; 91. Second driving component; 92. First gear; 93. Second gear; 94. Rotating shaft; 95. Slide groove; 96. Mounting box; 97. Slider; 98. Turntable. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0033] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0036] The first aspect of this embodiment relates to a sampling device, as detailed in Figures 1 and 2. This sampling device includes a positioning disk 72, a first mechanism 7, and a second mechanism 9. The positioning disk 72 has multiple placement slots 74 for placing sample vials 73. The first mechanism 7 is driven by the positioning disk 72 and is used to raise and lower the positioning disk 72. The second mechanism 9 is driven by either the first mechanism 7 or the positioning disk 72 and is used to move the positioning disk 72 so that the sample vials 73 in the placement slots 74 are sequentially aligned with the detection port 6, allowing the sample contained inside the sample vials 73 to enter the detection port 6 through evaporation.

[0037] Specifically, the positioning disk 72 is a circular disk-shaped structure with multiple placement slots 74 spaced circumferentially on it. The size of each placement slot 74 is slightly larger than that of the sample bottle 73, allowing the sample bottle 73 to be placed inside. The first mechanism 7 includes a first drive member 75, which is connected to the positioning disk 72. The first drive member 75 can be a hydraulic cylinder or a linear motor, and it drives the positioning disk 72 to move vertically. The second mechanism 9 can be directly connected to the first mechanism 7, driving both the first mechanism 7 and the positioning disk 72. Alternatively, the second mechanism 9 can also be directly connected to the positioning disk 72, directly driving its movement. The movement of the positioning disk 72 needs to be determined according to the arrangement of the placement slots 74 on the positioning disk 72. Specifically, it can be a reciprocating linear motion or a rotation. In this embodiment, since the positioning disk 72 adopts a circular disk structure, the second mechanism 9 can drive the positioning disk 72 to rotate. By controlling the rotation parameters, the sample bottles 73 in the placement slots 74 are aligned with the detection port 6 in sequence during the rotation. The sample to be tested in each corresponding sample bottle 73 enters the detection port 6 through volatilization, thereby completing the detection of the sample contained in the sample bottle 73.

[0038] This application, by setting up a first mechanism 7, enables the automatic lifting and lowering of the sample vial 73. When the gas in the sample vial 73 dissipates, the first mechanism 7 can precisely lift the positioning plate 72 and the sample vial 73 to the detection port 6, ensuring that the mouth of the sample vial 73 is precisely aligned with the detection port 6. This greatly improves the detection effect of the surface acoustic wave gas chromatograph and avoids problems such as misalignment and sample spillage that may occur when manually placing the sample vial 73, thus improving the accuracy and reliability of the detection. It also saves time and effort for manual operation, making the entire sampling process more efficient and convenient. On the other hand, this application, by setting up a second mechanism 9, enables continuous automatic sampling of multiple sets of sample vials 73 without the need for frequent manual replacement of sample vials 73, greatly improving sampling efficiency. Especially when multiple sets of samples need to be tested, the sampling task can be completed quickly and orderly, reducing the detection waiting time and improving the overall efficiency of the detection process. This allows the portable headspace sampling device to better meet the needs of rapid on-site detection.

[0039] In summary, this sampling device enables automated sampling, improves operational efficiency, avoids manual intervention, and prevents it from affecting the reliability and stability of test results. For continuous sampling of multiple samples, it also avoids human error and reduces the complexity of the operation.

[0040] Please refer to Figures 3 and 4 for further details. Optionally, a plurality of fixing components 71 are provided on the inner wall of the placement groove 74. The plurality of fixing components 71 clamp and fix the outer wall of the sample bottle 73 through elastic action.

[0041] In this embodiment, the placement groove 74 is a cylindrical groove that adapts to the outer contour of the sample bottle 73. Multiple fixing components 71 are arranged around the inner wall of the cylindrical groove. The multiple fixing components 71 use elasticity to stably fix the sample bottle 73 in the placement groove 74, thereby preventing the sample bottle 73 from shaking or moving up and down in the placement groove 74 during the rotation or upward and downward movement of the positioning disk 72. Furthermore, the shaking or up and down movement of the sample bottle 73 will affect the sample detection process and the accuracy of the detection.

[0042] In this embodiment, in order to ensure that the clamping effect of the fixing component 71 on the sample bottle 73 is centered, thereby ensuring the stability of the sample bottle 73, multiple fixing components 71 are evenly arranged around the outer periphery of the sample bottle 73. Preferably, this embodiment uses 6 sets of fixing components 71 evenly distributed around the outer periphery of the sample bottle 73.

[0043] Furthermore, the fixing assembly 71 includes a clamping plate 711 and an elastic member 713. One side of the clamping plate 711 is provided with anti-slip texture 714, and the other side of the clamping plate 711 is connected to the elastic member 713. The end of the elastic member 713 away from the clamping plate 711 is connected to the inner wall of the placement groove 74.

[0044] Specifically, one side of the clamp 711 has a concave arc-shaped structure adapted to the outer wall of the sample vial 73. Vertically extending grooves are spaced at intervals on the surface of the clamp 711 that contacts the outer wall of the sample vial 73, thus forming anti-slip textures 714 on the overall clamp 711 to prevent slippage of the sample vial 73 during fixation. Alternatively, anti-slip tape can be adhered to one side of the clamp 711 to increase the friction between the clamp 711 and the outer wall of the sample vial 73 through elastic compression, preventing the sample vial 73 from shaking or shifting vertically, and improving stability. The elastic element 713 can be a standard spring to improve replaceability. One end of the elastic element 713 is connected to the other side of the clamp 711, and the end of the elastic element 713 away from the clamp 711 is connected to the inner wall of the placement groove 74. When there is no sample bottle 73 in the placement slot 74, the elastic element 713 remains in its natural state. Once the sample bottle 73 is placed in the placement slot 74, the elastic element 713 is compressed and squeezes the clamping plate 711 through elastic force, so that the clamping plate 711 clamps the sample bottle 73.

[0045] Furthermore, the clamping plate 711 is provided with a positioning sleeve 712, and the elastic element 713 is located inside the positioning sleeve 712.

[0046] Specifically, the positioning sleeve 712 can be integrally formed onto the clamping plate 711, or it can be a separate structure that is fixed onto the clamping plate 711 by means of snap-fit, welding, or threaded connection. The positioning sleeve 712 is a cylindrical sleeve structure, and part of the elastic element 713 is placed inside the positioning sleeve 712.

[0047] In this embodiment, the positioning sleeve 712 facilitates the assembly of the elastic element 713, ensuring the convenience and efficiency of assembly. At the same time, when the elastic element 713 is compressed, the positioning sleeve 712 provides a certain support for the elastic element 713, preventing the elastic element 713 from tilting outward.

[0048] Optionally, a heating element 76 is provided at the bottom of the placement slot 74, and the sample bottle 73 is placed on the heating element 76.

[0049] Specifically, a heating element 76 is provided on the bottom wall of the placement groove 74, and the heating element 76 is a heating plate.

[0050] In this embodiment, the sample in the sample vial 73 is heated by the heating element 76, so that the gas in the sample can be quickly released to facilitate subsequent detection. At the same time, the first mechanism 7 can drive the sampling positioning plate 72 to rise, so that the mouth of the sample vial 73 can be aligned with the detection port 6 to improve the effect of gas chromatography detection.

[0051] Please refer to Figure 5. Optionally, the second mechanism 9 includes a second driving member 91, a first gear 92, a second gear 93, and a rotating shaft 94. The second driving member 91 is connected to the first gear 92 in a transmission manner, the first gear 92 is meshed with the second gear 93 in a transmission manner, the rotating shaft 94 is connected to the second gear 93, and the rotating shaft 94 is connected to the positioning disk 72 or the first mechanism 7 in a transmission manner.

[0052] Specifically, the output end of the second driving member 91 is connected to the first gear 92. The second driving member 91 can drive the first gear 92, thereby causing the second gear 93 to rotate. The center of the second gear 93 is provided with a rotating shaft 94.

[0053] In this embodiment, the first gear 92 is a small gear and the second gear 93 is a large gear, which is used to achieve two-stage matching deceleration. The rotating shaft 94 can directly drive the positioning disk 72 or drive the positioning disk 72 by driving the first mechanism 7 to rotate.

[0054] Furthermore, the second mechanism 9 also includes a turntable 98, one side of which is connected to the positioning plate 72 or the first mechanism 7, and the other side of which is connected to the rotating shaft 94; the sampling device also includes a base plate 1, the rotating shaft 94 passes through the base plate 1, a slider 97 is provided on the surface of the turntable 98 opposite to the base plate 1, and a groove 95 is provided on the base plate 1, and the slider 97 slides in the groove 95.

[0055] In this embodiment, the rotating shaft 94 is connected to the positioning disk 72 or the first mechanism 7 via a turntable 98. The turntable 98 not only enables transmission but also provides support for the positioning disk 72 or the first mechanism 7. Furthermore, the base plate 1 provides positioning and support for the second mechanism 9. Support legs 2 are provided at the four corners on the lower surface of the base plate 1. The height of the support legs 2 can be adjusted to adapt to pressing against the ground and ensure that the base plate 1 is level. The lower surface of the base plate 1 is also provided with a mounting box 96, in which the second driving component 91, the first gear 92, the second gear 93 and part of the rotating shaft 94 are all located inside the mounting box 96 to achieve the purpose of dust prevention. The mounting box 96 can be connected to the lower surface of the base plate 1 by means of screw connection or other detachable means. The rotating shaft 94 passes through the base plate 1, and the turntable 98 is located on one side of the upper surface of the base plate 1 and is spaced apart from the base plate 1. The turntable 98 is provided with a slider 97 relative to the surface of the base plate 1. Adaptively, the base plate 1 is provided with a sliding groove 95. When the rotating shaft 94 drives the turntable 98 to rotate, the slider 97 can slide along the sliding groove 95.

[0056] Optionally, a control panel 8 is also provided on the upper surface of the base plate 1. The control panel 8 is used to control the start and stop of the first mechanism 7 and the second mechanism 9, as well as the transport parameters of the corresponding first drive component 75 and second drive component 91. The control panel 8 can adopt an existing PLC control system.

[0057] In this embodiment, when the turntable 98 rotates, it will cause the slider 97 to slide inside the groove 95, thereby improving the stability of the turntable 98 during rotation.

[0058] The working principle of this sampling device is briefly explained below.

[0059] When using this sampling device, the sample bottles 73 to be tested are placed one by one into the placement slot 74. At this time, the sample bottles 73 will squeeze the elastic element 713. The rebound force generated by the elastic element 713 will drive the clamp 711 to firmly fix the sample bottles 73. At the same time, the anti-slip texture 714 on the side of the clamp 711 can prevent the sample bottles 73 from slipping when fixed. The sample in the sample vial 73 is heated by the heating element 76, allowing the gas in the sample to dissipate quickly, facilitating subsequent detection by the main body 5. Simultaneously, the first mechanism 7 raises the positioning plate 72, aligning the mouth of the sample vial 73 with the detection port 6, thus improving the detection effect of the main body 5. When detecting another set of sample vials 73, the second drive element 91 is activated. The second drive element 91 drives the first gear 92 to rotate via its output end. The rotation of the first gear 92 drives the second gear 93 to rotate, which in turn drives the rotating shaft 94 to rotate. The rotating shaft 94 then drives the turntable 98 to rotate. When the turntable 98 rotates, it causes the slider 97 to slide inside the groove 95, thereby improving the stability of the turntable 98's rotation. Using the data set on the control panel 8, the turntable 98 can automatically rotate clockwise or counterclockwise in 60-degree cycles, thus smoothly lifting the sample vials 73 on the upper end of the positioning plate 72 one by one to the lower end of the detection port 6 for detection.

[0060] The second aspect of this embodiment also relates to a surface acoustic wave gas chromatograph, which includes a main body 5 and more sampling devices, wherein a detection port 6 is disposed on the main body 5.

[0061] Specifically, a support frame 3 is erected on the base plate 1, and the main body 5 is screwed to the support frame 3 by bolts 4, with the inspection port 6 facing downwards. The main body 5 is existing publicly available technology, and corresponding product models can be referenced.

[0062] The surface acoustic wave gas chromatograph based on this sampling device can avoid manual intervention, improve the level of automation and detection efficiency.

[0063] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A sampling device, characterized in that, include: A positioning disk (72) is provided with multiple placement slots (74) for placing sample bottles (73); a first mechanism (7) is connected to the positioning disk (72) for driving the positioning disk (72) to rise and fall; a second mechanism (9) is connected to the first mechanism (7) or the positioning disk (72) for driving the positioning disk (72) to move so that the sample bottles (73) in the placement slots (74) are aligned with the detection port (6) in sequence, and the sample contained in the sample bottle (73) can enter the detection port (6) through evaporation.

2. The sampling device according to claim 1, characterized in that, The inner wall of the placement groove (74) is provided with a plurality of fixing components (71), which clamp and fix the outer wall of the sample bottle (73) by elastic action.

3. The sampling device according to claim 2, characterized in that, The fixing component (71) includes a clamping plate (711) and an elastic element (713). One side of the clamping plate (711) is provided with anti-slip texture (714), and the other side of the clamping plate (711) is connected to the elastic element (713). The end of the elastic element (713) away from the clamping plate (711) is connected to the inner wall of the placement groove (74).

4. The sampling device according to claim 3, characterized in that, The clamping plate (711) is provided with a positioning sleeve (712), and part of the structure of the elastic element (713) is located inside the positioning sleeve (712).

5. The sampling device according to claim 1, characterized in that, The bottom of the placement slot (74) is provided with a heating element (76), and the sample bottle (73) is placed on the heating element (76).

6. The sampling device according to claim 1, characterized in that, The first mechanism (7) includes a first drive member (75), which is connected to the positioning disk (72) in a transmission manner.

7. The sampling device according to claim 6, characterized in that, Multiple placement slots (74) are arranged circumferentially on the positioning disk (72), and the second mechanism (9) is used to drive the first mechanism (7) or the positioning disk (72) to rotate the positioning disk (72).

8. The sampling device according to claim 7, characterized in that, The second mechanism (9) includes a second drive member (91), a first gear (92), a second gear (93), and a rotating shaft (94). The second drive member (91) is connected to the first gear (92) in a transmission manner. The first gear (92) meshes with the second gear (93) in a transmission manner. The rotating shaft (94) is connected to the second gear (93) in a transmission manner. The rotating shaft (94) is connected to the positioning disk (72) or the first mechanism (7).

9. The sampling device according to claim 8, characterized in that, The second mechanism (9) further includes a turntable (98), one side of which is connected to the positioning disk (72) or the first mechanism (7) for transmission, and the other side of which is connected to the rotating shaft (94); the sampling device further includes a base plate (1), the rotating shaft (94) passes through the base plate (1), a slider (97) is provided on the surface of the turntable (98) opposite to the base plate (1), a groove (95) is provided on the base plate (1), and the slider (97) slides in the groove (95).

10. A surface acoustic wave gas chromatograph, characterized in that, It includes a main body (5) and a sampling device according to any one of claims 1-9, wherein the detection port (6) is disposed on the main body (5).

Images