Automatic sampling device of gas chromatograph

Abstract

The utility model relates to the technical field of gas chromatograph automatic sample introduction, and discloses a gas chromatograph automatic sample introduction device which comprises a sample introduction table, a gas chromatograph body is arranged on the surface of the sample introduction table, and a supporting frame is fixedly installed on the surface of the sample introduction table. The output shaft of the motor drives the connecting plate to do circular motion on the surface of the sample injection table, when the connecting plate rotates, the protruding block fixed to the surface of the connecting plate abuts against the inner wall of the arc hole and abuts against the transverse plate to move in the rotating process, and the containing plate fixed to the surface of the transverse plate moves synchronously; the supporting frame and the connecting rod which are fixed on the surface of the placing plate can move on the surface of the supporting frame at a constant speed and a fixed distance, so that samples in the groove can intermittently enter the gas chromatograph body, automatic sample injection of the samples is realized, and the labor intensity of analysts is relieved.

Description

Technical Field

[0001] This utility model relates to the field of automatic sample injection technology for gas chromatographs, specifically to an automatic sample injection device for gas chromatographs. Background Technology

[0002] Gas chromatography is an instrument that uses chromatographic separation and detection techniques to perform qualitative and quantitative analysis of complex mixtures of multiple components. It is typically used to analyze thermally stable organic compounds in soil with boiling points not exceeding 500°C, such as volatile organic compounds, organochlorines, organophosphorus compounds, polycyclic aromatic hydrocarbons, and phthalates.

[0003] According to the published automatic sample loading device for gas chromatograph (Announcement No.: CN211061487U), the sample vials are still loaded manually. This manual loading method not only increases the workload of analysts and reduces work efficiency, but also makes it impossible to accurately interrupt the detection time of each sample vial, resulting in unstable analytical results. To address this issue, we propose an automatic sample loading device for gas chromatograph. Utility Model Content

[0004] The purpose of this invention is to provide an automatic sample injection device for a gas chromatograph to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an automatic sample injection device for a gas chromatograph, including an injection stage, a gas chromatograph body disposed on the surface of the injection stage, a support frame fixedly installed on the surface of the injection stage, the support frame passing through a connecting rod and slidably connected to the connecting rod, a control component for uniform motion disposed on the surface of the injection stage, the control component including: a placement plate, a groove formed on the surface of the placement plate, a horizontal plate fixedly installed on the surface of the placement plate, an arc hole formed on the surface of the horizontal plate, and a round hole formed on the surface of the horizontal plate. This method realizes automatic sample injection, thereby reducing the labor intensity of analysts.

[0006] Preferably, the control assembly further includes a rotating component, which includes an arc block. The surface of the arc block is in contact with the inner wall of the arc hole, and the arc block will rotate inside the arc hole when the connecting plate rotates.

[0007] Preferably, the arc block is fixedly installed on the surface of the connecting plate, the connecting plate is rotatably connected to the surface of the sample inlet stage, and a protrusion is fixedly installed on the surface of the connecting plate. When the connecting plate rotates, the arc block and the protrusion will rotate with the connecting plate.

[0008] Preferably, the surface of the connecting plate is fixedly connected to the output shaft of the motor, and the motor is fixedly mounted on the surface of the sample inlet stage. The output shaft of the motor can drive the connecting plate to perform circular motion on the surface of the sample inlet stage.

[0009] Preferably, a support frame is fixedly installed on the surface of the placement plate, and the surface of the support frame is fixedly connected to the surface of the connecting rod. The support frame can slide stably on the surface of the sample inlet stage through the connecting rod.

[0010] Preferably, the surface of the support frame is rotatably connected to the surface of the circular plate, and a threaded rod is fixedly installed on the surface of the circular plate. The threaded rod passes through the support frame and is rotatably connected to the support frame, and the circular plate can drive the threaded rod to perform circular motion within the support frame.

[0011] Preferably, the threaded rod passes through the slide plate and is threadedly connected to the slide plate. A support rod is fixedly installed on the surface of the slide plate. The support rod passes through the support frame and is slidably connected to the support frame. The support rod passes through the groove and is slidably connected to the groove. When the threaded rod rotates, the slide plate can drive the support rod to slide in the groove.

[0012] Compared with the prior art, the present invention provides an automatic sample injection device for a gas chromatograph, which has the following beneficial effects:

[0013] 1. This automatic sample injection device for gas chromatographs, equipped with a control component, uses a motor output shaft to drive a connecting plate to rotate on the surface of the injection stage. As the connecting plate rotates, the protrusions fixed to the surface of the connecting plate abut against the inner wall of the arc hole and move against the horizontal plate during rotation. The placement plate fixed to the surface of the horizontal plate moves synchronously. The support frame and connecting rod fixed to the surface of the placement plate can move at a uniform speed and distance on the surface of the support frame. Thus, the sample in the groove can enter the gas chromatograph body intermittently. This method realizes automatic sample injection, thereby reducing the labor intensity of analysts.

[0014] 2. The automatic sample injection device of this gas chromatograph has a rotating component. When the circular plate drives the threaded rod to rotate in the support frame, the slide plate can move laterally in the connecting frame. The support rod fixed on the surface of the slide plate will slide in the groove opened in the placement plate to fix the sample bottle placed in the groove, ensuring that the sample bottle is always in the correct position during the movement and loading process, and preventing inaccurate injection due to position deviation. Attached Figure Description

[0015] Figure 1 This is a front view structural diagram of the present invention;

[0016] Figure 2 This is a top view of the structure of this utility model;

[0017] Figure 3This is a schematic diagram of the rear view structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the control component structure of this utility model.

[0019] In the diagram: 1. Sample inlet stage; 2. Gas chromatograph body; 3. Support frame; 4. Connecting rod; 5. Control components; 51. Placement plate; 52. Groove; 53. Horizontal plate; 54. Arc hole; 55. Round hole; 56. Rotating component; 561. Arc block; 562. Connecting plate; 563. Protrusion; 564. Motor; 565. Support frame; 566. Round plate; 567. Threaded rod; 568. Slide plate; 569. Support rod. Detailed Implementation

[0020] like Figures 1-4 As shown, this utility model provides a technical solution: an automatic sample injection device for a gas chromatograph, including an injection stage 1, a gas chromatograph body 2 disposed on the surface of the injection stage 1, a support frame 3 fixedly installed on the surface of the injection stage 1, the support frame 3 passing through a connecting rod 4 and slidably connected to the connecting rod 4, a control component 5 for uniform motion disposed on the surface of the injection stage 1, the control component 5 including: a placement plate 51, a groove 52 formed on the surface of the placement plate 51, a horizontal plate 53 fixedly installed on the surface of the placement plate 51, an arc hole 54 formed on the surface of the horizontal plate 53, and a round hole 55 formed on the surface of the horizontal plate 53, the placement plate 51 fixed on the surface of the horizontal plate 53 moves synchronously, when the placement plate 51 moves, the support frame 565 fixed on the surface of the placement plate 51 and the connecting rod 4 can move uniformly and at a fixed distance on the surface of the support frame 3, so that the sample in the groove 52 can intermittently enter the gas chromatograph body 2, this method realizes automatic sample injection, thereby reducing the labor intensity of the analyst.

[0021] The control assembly 5 also includes a rotating component 56, which includes an arc block 561. The surface of the arc block 561 is in contact with the inner wall of the arc hole 54. When the connecting plate 562 rotates, the arc block 561 will rotate within the arc hole 54. The arc block 561 is fixedly mounted on the surface of the connecting plate 562, which is rotatably connected to the surface of the sample inlet stage 1. A protrusion 563 is fixedly mounted on the surface of the connecting plate 562. When the connecting plate 562 rotates, the arc block 561 and the protrusion 563 will rotate with the connecting plate 562. The surface of the connecting plate 562 is fixedly connected to the output shaft of the motor 564, which is fixedly mounted on the surface of the sample inlet stage 1. The output shaft of the motor 564 can drive the connecting plate 562 to perform circular motion on the surface of the sample inlet stage 1. A support frame 565 is fixedly mounted on the surface of the placement plate 51. The surface of the support frame 565 is fixedly connected to the surface of the connecting rod 4. The support frame 565 can slide stably on the surface of the sample inlet stage 1 via the connecting rod 4. The surface of the support frame 565 is rotatably connected to the surface of the circular plate 566. A threaded rod 567 is fixedly installed on the surface of the circular plate 566. The threaded rod 567 passes through the support frame 565 and is rotatably connected to the support frame 565. The circular plate 566 can drive the threaded rod 567 to perform circular motion within the support frame 565. The threaded rod 567 passes through the slide plate 568 and is threadedly connected to the slide plate 568. A support rod 569 is fixedly installed on the surface of the slide plate 568. The support rod 569 passes through the support frame 565 and is slidably connected to the support frame 565. The support rod 569 passes through the groove 52 and is slidably connected to the groove 52. When the threaded rod 567 rotates, the slide plate 568 can drive the support rod 569 to slide within the groove 52.

[0022] In this invention, the sample to be analyzed is placed in a sample vial. After placement, several sets of sample vials are placed into the grooves 52 on the surface of the placement plate 51. After placement, the circular plate 566 is rotated on the surface of the support frame 565. The circular plate 566 is subjected to force, which drives the threaded rod 567 to rotate within the support frame 565. When the threaded rod 567 rotates, the sliding plate 568 slides within the support frame 565, and the support rod 569 fixed to the surface of the sliding plate 568 slides within the groove 52. The sample vial placed in the groove 52 is fixed. After fixing, the motor 564 at the bottom of the sample inlet stage 1 is started. The output shaft of the motor 564 drives the connecting plate 562 to perform circular motion on the surface of the sample inlet stage 1. When the connecting plate 562 rotates, the arc block 561 rotates in the arc hole 54. The protrusion 563 fixed on the surface of the connecting plate 562 will abut against the inner wall of the arc hole 54 and move against the horizontal plate 53 during the rotation. The placement plate 51 fixed on the surface of the horizontal plate 53 moves synchronously. When the placement plate 51 moves, the support frame 565 and connecting rod 4 fixed on the surface of the placement plate 51 can move at a uniform speed and distance on the surface of the support frame 3. Then the sample in the groove 52 can intermittently enter the gas chromatograph body 2. This method realizes automatic sample injection, thereby reducing the labor intensity of the analyst. After entering the gas chromatograph body 2, the autosampler inserts the injection needle into the sample bottle through a precisely controlled mechanical device to extract a certain amount of sample. The extracted sample is rapidly vaporized through the injection port into a gaseous mixture. The vaporized sample is carried into the chromatographic column by an inert carrier gas (such as nitrogen, helium, etc.). Different components in the sample interact with the stationary phase in the chromatographic column. Due to the different partition coefficients of each component in the stationary phase, their retention times in the chromatographic column are different, thereby achieving separation. The detector converts the concentration or mass of the component into an electrical signal. The electrical signal generated by the detector is transmitted to the data processing system. After processing and analysis, a chromatogram is obtained.

[0023] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. An automatic sample injection device for a gas chromatograph, comprising an injection stage (1), characterized in that: The surface of the injection stage (1) is provided with a gas chromatograph body (2), and a support frame (3) is fixedly installed on the surface of the injection stage (1). The support frame (3) passes through the connecting rod (4) and is slidably connected to the connecting rod (4). The surface of the injection stage (1) is provided with a control component (5) for uniform motion. The control component (5) includes: a placement plate (51), a groove (52) is opened on the surface of the placement plate (51), a horizontal plate (53) is fixedly installed on the surface of the placement plate (51), an arc hole (54) is opened on the surface of the horizontal plate (53), and a round hole (55) is opened on the surface of the horizontal plate (53).

2. The automatic sample introduction device for a gas chromatograph according to claim 1, characterized in that: The control component (5) also includes a rotating component (56), which includes an arc block (561) whose surface is in contact with the inner wall of the arc hole (54).

3. The automatic sample introduction device for a gas chromatograph according to claim 2, characterized in that: The arc block (561) is fixedly installed on the surface of the connecting plate (562), the connecting plate (562) is rotatably connected to the surface of the sample inlet stage (1), and a protrusion (563) is fixedly installed on the surface of the connecting plate (562).

4. The automatic sample introduction device for a gas chromatograph according to claim 3, characterized in that: The surface of the connecting plate (562) is fixedly connected to the output shaft of the motor (564), and the motor (564) is fixedly mounted on the surface of the sample feeding stage (1).

5. The automatic sample introduction device for a gas chromatograph according to claim 1, characterized in that: A support frame (565) is fixedly installed on the surface of the placement plate (51), and the surface of the support frame (565) is fixedly connected to the surface of the connecting rod (4).

6. The automatic sample introduction device for a gas chromatograph according to claim 5, characterized in that: The surface of the support frame (565) is rotatably connected to the surface of the circular plate (566). A threaded rod (567) is fixedly installed on the surface of the circular plate (566). The threaded rod (567) passes through the support frame (565) and is rotatably connected to the support frame (565).

7. An automatic sample introduction device for a gas chromatograph according to claim 6, characterized in that: The threaded rod (567) passes through the slide plate (568) and is threadedly connected to the slide plate (568). A support rod (569) is fixedly installed on the surface of the slide plate (568). The support rod (569) passes through the support frame (565) and is slidably connected to the support frame (565). The support rod (569) passes through the groove (52) and is slidably connected to the groove (52).

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