A sample injection device for a gas chromatograph

Abstract

The utility model provides a kind of gas chromatograph with sample introduction device, it is related to sample testing device technical field, the gas chromatograph with sample introduction device includes sample introduction needle mechanism and test tube containing box mechanism, further include support base, linear drive mechanism and operation platform, linear drive mechanism is set on support base, linear drive mechanism is connected with test tube containing box mechanism transmission, for driving test tube containing box mechanism linearly moves along preset path on support base, to make test tube containing box mechanism move to the below of sample introduction needle mechanism or give way out of operation space;Operation platform is detachably connected on support base, and located in operation space;By linear drive mechanism, test tube containing box mechanism can be removed as needed, invalid occupied space under non-working state is changed into effective temporary operation area, greatly improve the space utilization of equipment platform and the flexibility of experimental operation.

Description

Technical Field

[0001] This utility model relates to the field of sample testing device technology, and in particular to a sample injection device for a gas chromatograph. Background Technology

[0002] Gas chromatography (GC) is an important instrument for separating and determining low-boiling-point mixed components. It can be used for instrumental analysis experiments in chemical engineering, bioengineering, and food science, as well as for scientific research and routine analysis. It is used to detect and analyze gaseous substances or substances that can be converted into gases at a certain temperature. Due to the different physical properties of substances, the partition coefficients of each component in the sample are different between the gas phase and the stationary liquid phase. When the vaporized sample is carried into the chromatographic column by the carrier gas, the components are repeatedly partitioned between the two phases. Because the stationary phase has different adsorption or dissolution capacities for each component, even if the carrier gas flow rate is the same, the running speed of each component in the chromatographic column is different. After a certain period of flow, they are separated from each other and leave the chromatographic column in sequence to enter the detector. The generated signals are amplified and plotted on the recorder as the chromatographic peaks of each component. In typical gas chromatographs, reagent tubes are placed on top of the rotating disk without being separated by modular containers, which easily leads to the mixing of sample solutions and washing solutions. Furthermore, reagent tubes at different heights are usually not stabilized at the top, making it difficult to insert the injection needle. Generally, the injection needle needs to be cleaned after each liquid collection and injection before the next operation. Repeated operations can also damage the injection needle. If it is not replaced regularly, it will affect the normal collection process.

[0003] An automatic sample injector for a gas chromatograph, with application number CN202310378622.7, although not convenient for distinguishing solvents contained in the container during use, facilitates the replacement of the entire injection needle after multiple uses.

[0004] The applicant has discovered at least the following technical problems in the prior art: regardless of whether the sample is being injected, the entire test tube container, including the test tube rack or sample tray, is always fixed in a specific area of ​​the equipment table, occupying valuable operating space. When the experimenter needs to perform sample pretreatment, change solvents, or place other auxiliary equipment (e.g., a constant temperature chamber for sample preparation or a special reagent container), this fixed test tube container will physically obstruct the placement of the liquid oxygen preparation chamber, resulting in inconvenience and reducing the utilization rate of the space around the equipment and the flexibility of operation. Utility Model Content

[0005] The purpose of this utility model is to provide a sample injection device for a gas chromatograph to solve the technical problem that the test tube container is always located below the injection needle mechanism in the prior art, which occupies operating space and is inconvenient to use; the various technical effects of the preferred technical solution among the many technical solutions provided by this utility model are described in detail below.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The gas chromatograph injection device provided by this utility model includes an injection needle mechanism and a test tube receiving box mechanism, and also includes a support base, a linear drive mechanism and an operating platform, wherein: The linear drive mechanism is disposed on the support base and is connected to the test tube container mechanism. It is used to drive the test tube container mechanism to move linearly along a preset path on the support base, so that the test tube container mechanism moves to the underside of the injection needle mechanism or makes room for operation. The operating platform is detachably connected to the support base and located within the operating space.

[0007] Preferably, the linear drive mechanism includes a drive component and a motion conversion component, wherein: The driving component is fixed on the support base and is connected to the test tube container mechanism. The driving component is also connected to the motion conversion component to convert the motion of the driving component into linear motion and drive the test tube container mechanism to move linearly.

[0008] Preferably, the linear drive mechanism includes a drive motor, a threaded adjusting rod, and an adjusting block, wherein: The drive motor is fixed on the support base, the threaded adjusting rod is rotatably connected to the support base, and the drive motor is driven to drive the threaded adjusting rod to rotate in the forward or reverse direction. The adjusting block is threadedly connected to the threaded adjusting rod, and the test tube receiving box mechanism is fixedly connected to the adjusting block. When the threaded adjusting rod rotates, it can drive the adjusting block and the test tube receiving box mechanism to slide linearly on the support base.

[0009] Preferably, the adjusting block is provided with a threaded hole, the threaded hole passing through the opposite ends of the adjusting block, and the threaded adjusting rod passing through the threaded hole and threadedly connected to the adjusting block.

[0010] Preferably, the support base has a guide groove with the groove opening facing upwards, the threaded adjusting rod is rotatably disposed within the guide groove, and the adjusting block is located within the guide groove; The longitudinal section of the guide groove matches the outer contour of the adjusting block, thereby restricting the adjusting block to slide only in a straight line along the guide groove.

[0011] Preferably, the guide groove extends along the length of the support base, and the drive motor and the injection needle mechanism are located at opposite ends of the support base.

[0012] Preferably, one of the support base and the operating platform is provided with a positioning groove, and the other is provided with a positioning protrusion. The test tube receiving box mechanism makes way for the operating space, and when the positioning protrusion is inserted into the positioning groove, the operating platform can be positioned and connected to the support base.

[0013] Preferably, when the operating platform is positioned and connected to the support base, the operating platform is located between the test tube container mechanism and the injection needle mechanism.

[0014] Preferably, the positioning grooves are distributed on opposite sides of the linear drive mechanism.

[0015] Preferably, the operating platform includes a platform plate, and the positioning protrusion is fixed at the bottom corner of the platform plate.

[0016] The gas chromatograph injection device provided by this utility model has the following advantages compared with the prior art: The linear drive mechanism allows the test tube container mechanism to be moved as needed, transforming the ineffective occupied space in the non-working state into an effective temporary operating area, greatly improving the space utilization of the equipment platform and the flexibility of experimental operations. By adding a detachable operating platform that matches the operating space, a temporary operating table function is integrated, allowing auxiliary operations such as sample pretreatment and reagent preparation to be performed adjacent to the injection port, optimizing the experimental process, improving work efficiency, realizing dynamic management and reuse of the equipment operating space, solving the common operating space conflict problem in the prior art, and having a simple structure that is easy to implement. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the axial side structure of the sample injection device for a gas chromatograph according to this utility model; Figure 2This is a schematic diagram of the axial side structure of the sample injection device for the gas chromatograph of this utility model in another state; Figure 3 This is an axial sectional view of the sample injection device for a gas chromatograph according to this utility model.

[0019] In the figure: 1. Injection needle mechanism; 2. Test tube container mechanism; 3. Support base; 4. Guide groove; 5. Drive motor; 6. Threaded adjustment rod; 7. Adjustment block; 8. Threaded hole; 9. Positioning groove; 10. Operating platform; 11. Positioning protrusion. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be understood that the terms "center," "length," "width," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and "side," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of 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.

[0023] This utility model provides a sample injection device for a gas chromatograph. By setting up a movable test tube container mechanism and a removable operating platform, the solution realizes dynamic management and reuse of the operating space around the sample injection device, thereby improving the flexibility of experimental operation and space utilization.

[0024] The following is combined Figures 1-3The technical solution provided by this utility model will be described in more detail.

[0025] like Figures 1-3 As shown, the gas chromatograph injection device provided by this utility model includes an injection needle mechanism 1 and a test tube container mechanism 2, as well as a support base 3, a linear drive mechanism, and an operating platform 10. The linear drive mechanism is disposed on the support base 3 and is connected to the test tube container mechanism 2 for driving the test tube container mechanism 2 to move linearly along a preset path on the support base 3, so that the test tube container mechanism 2 moves below the injection needle mechanism 1 or makes room for operation. The operating platform 10 is detachably connected to the support base 3 and is located within the operating space.

[0026] The structure and usage of the injection needle mechanism 1 and the test tube container mechanism 2 described in this embodiment have been disclosed in detail in an automatic injection device for a gas chromatograph with application number CN202310378622.7. It is prior art, so this utility model will not describe it in detail.

[0027] In the appendix Figure 2 In the sample injection state shown, the test tube container mechanism 2 is located directly below the injection needle mechanism 1, so that the injection needle mechanism 1 can accurately insert the injection needle into any sample bottle on the test tube container mechanism 2 through its vertical movement to perform the sampling operation.

[0028] See Figure 1 As shown, when the test tube receiving mechanism 2 is driven by the linear drive mechanism to a position that frees up operating space, the experimenter can install or set the operating platform 10 on the support base 3 so that it occupies the newly vacated operating space. In this way, a temporary and stable physical operating surface is formed near the injection needle mechanism 1, which provides convenience for the experimenter to perform sample pretreatment work such as sample dilution, reagent addition, and standard preparation.

[0029] As an optional implementation, the linear drive mechanism in this embodiment includes a drive component and a motion conversion component, wherein: the drive component is fixed on the support base 3 and is connected to the test tube container mechanism 2 in a transmission manner; the drive component is connected to the motion conversion component in a transmission manner, which is used to convert the motion of the drive component into linear motion and drive the test tube container mechanism 2 to move linearly.

[0030] For details, see Figures 1-3As shown, the linear drive mechanism includes a drive motor 5, a threaded adjusting rod 6, and an adjusting block 7. The drive motor 5 is fixed to the support base 3, and the threaded adjusting rod 6 is rotatably connected to the support base 3. The drive motor 5 and the threaded adjusting rod 6 are driven together to drive the threaded adjusting rod 6 to rotate in either the forward or reverse direction. The adjusting block 7 is threadedly connected to the threaded adjusting rod 6, and the test tube receiving mechanism 2 is fixedly connected to the adjusting block 7. When the threaded adjusting rod 6 rotates, it drives the adjusting block 7 and the test tube receiving mechanism 2 to slide linearly on the support base 3. The threaded adjusting rod 6 is a long rod with precision threads machined on its surface. Both ends are rotatably mounted on the support base 3 via bearings, allowing it to rotate stably around its own axis.

[0031] As an optional implementation, see Figure 3 As shown, the adjusting block 7 is provided with a threaded hole 8, which passes through the opposite ends of the adjusting block 7. The threaded adjusting rod 6 passes through the threaded hole 8 and is threadedly connected to the adjusting block 7.

[0032] See Figures 1-3 As shown, the threaded hole 8 inside the adjusting block 7 matches the external thread of the threaded adjusting rod 6. Through this threaded engagement, when the drive motor 5 drives the threaded adjusting rod 6 to rotate, the adjusting block 7, due to rotational constraint, will move linearly along the axial direction of the threaded adjusting rod 6. The bottom of the test tube container mechanism 2 is fixed to the upper surface of the adjusting block 7. Therefore, the linear movement of the adjusting block 7 will directly drive the test tube container mechanism 2 to move synchronously linearly on the support base 3.

[0033] To further ensure the stability and accuracy of the movement, as an optional implementation method, see [link to implementation details]. Figures 1-3 As shown, a guide groove 4 is provided on the support base 3, with the groove opening of the guide groove 4 facing upward. The threaded adjustment rod 6 is rotatably arranged in the guide groove 4, and the adjustment block 7 is located in the guide groove 4. The longitudinal section of the guide groove 4 matches the outer contour of the adjustment block 7, thereby restricting the adjustment block 7 to slide only in a straight line along the guide groove 4.

[0034] The cross-section of the guide groove 4 can be rectangular or trapezoidal. See also Figure 3 As shown, the adjusting block 7, or its bottom, has a shape that matches the inner wall contour of the guide groove 4 and is accommodated within the guide groove 4. Through the sliding fit between the outer wall of the adjusting block 7 and the inner wall of the guide groove 4, the degree of freedom of movement of the adjusting block 7 is effectively restricted, allowing it to slide only linearly.

[0035] The above structure ensures that the horizontal linear movement of the test tube container mechanism 2 on the support base 3 is smooth, precise and highly repeatable.

[0036] As an optional implementation, see Figure 1The guide groove 4 extends along the length of the support base 3, and the drive motor 5 and the injection needle mechanism 1 are located at opposite ends of the support base 3.

[0037] The above-described arrangement allows the adjusting block 7 to move the test tube container mechanism 2 along the length of the supporting base 3, thereby occupying or freeing up operating space. In this embodiment, the operating space refers to... Figure 1 The space where the central operating platform 10 is located.

[0038] As an optional implementation, one of the support base 3 and the operating platform 10 is provided with a positioning groove 9, and the other is provided with a positioning protrusion 11. The test tube receiving box mechanism 2 makes room for operation, and when the positioning protrusion 11 is inserted into the positioning groove 9, the operating platform 10 can be positioned and connected to the support base 3.

[0039] In this embodiment, see Figures 1-3 As shown, the operating platform 10 is mainly composed of a platform plate with a flat upper surface. The platform plate can be made of corrosion-resistant and easy-to-clean materials, such as stainless steel, engineering plastics, or aluminum plates with a special coating.

[0040] See Figure 2 and Figure 3 As shown, in order to achieve a secure and removable connection with the support base 3, the bottom of the platform plate is integrally formed or additionally fixed with one or more positioning protrusions 11.

[0041] Accordingly, see Figure 2 and Figure 3 As shown, within the operating space area on the support base 3, positioning grooves 9 are precisely machined to perfectly match the number, position, and shape of the positioning protrusions 11. See also Figure 2 As shown, the positioning grooves 9 are distributed on opposite sides of the linear drive mechanism.

[0042] When the operating platform 10 needs to be installed, the experimenter only needs to hold the operating platform 10, align the positioning protrusion 11 on its bottom with the positioning groove 9 on the support base 3, and place it vertically downwards so that the positioning protrusion 11 is fully inserted into the positioning groove 9. Through this plug-in mechanical engagement, the operating platform 10 is firmly positioned on the support base 3, thereby providing a safe and reliable operating surface.

[0043] After sample pretreatment is completed, the operator can lift the operating platform 10 upwards to remove it from the support base 3, making it easier to move the test tube container mechanism 2 back below the injection needle mechanism 1. This positioning structure ensures reliable fixation and convenient disassembly of the operating platform 10.

[0044] As an optional implementation, see Figure 1As shown, when the operating platform 10 is positioned and connected to the support base 3, the operating platform 10 is located between the test tube container mechanism 2 and the injection needle mechanism 1.

[0045] The exposed edges of the support base 3 and the operating platform 10 can be chamfered or rounded to avoid accidental scratches to the experimenters from sharp edges, thereby improving the safety of use.

[0046] When the injection device of this gas chromatograph delivers liquid to the gas chromatograph, the test tube holding box mechanism 2 will not obstruct the operating space, making it easy to place the liquid oxygen modulation box so that the injection needle can deliver liquid sample.

[0047] In summary, the sample injection device for this gas chromatograph can be operated by turning on the drive motor 5, which rotates the threaded adjusting rod 6, causing the test tube receiving box mechanism 2 to move and create more operating space. Figure 1 As shown, the operating platform 10 is fixed on the support base 3 by the cooperation between the positioning protrusion 11 and the positioning groove 9, thereby providing a larger sampling operation space, so as to facilitate the use of the adjustment injection needle mechanism 1, and to facilitate the placement of the liquid oxygen modulation box so that the injection needle can deliver liquid samples. The gas chromatograph injection device has a better performance.

[0048] The specific features, structures, or characteristics described in this specification may be combined in any suitable manner in one or more embodiments or examples.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A sample injection device for a gas chromatograph, comprising an injection needle mechanism and a test tube receiving mechanism, characterized in that, It also includes a support base, a linear drive mechanism, and an operating platform, wherein: The linear drive mechanism is disposed on the support base and is connected to the test tube container mechanism. It is used to drive the test tube container mechanism to move linearly along a preset path on the support base, so that the test tube container mechanism moves to the underside of the injection needle mechanism or makes room for operation. The operating platform is detachably connected to the support base and located within the operating space.

2. The sample injection device for a gas chromatograph according to claim 1, characterized in that, The linear drive mechanism includes a drive component and a motion conversion component, wherein: The driving component is fixed on the support base and is connected to the test tube container mechanism. The driving component is also connected to the motion conversion component to convert the motion of the driving component into linear motion and drive the test tube container mechanism to move linearly.

3. The sample injection device for a gas chromatograph according to claim 1 or 2, characterized in that, The linear drive mechanism includes a drive motor, a threaded adjusting rod, and an adjusting block, wherein: The drive motor is fixed on the support base, the threaded adjusting rod is rotatably connected to the support base, and the drive motor is driven to drive the threaded adjusting rod to rotate in the forward or reverse direction. The adjusting block is threadedly connected to the threaded adjusting rod, and the test tube receiving box mechanism is fixedly connected to the adjusting block. When the threaded adjusting rod rotates, it can drive the adjusting block and the test tube receiving box mechanism to slide linearly on the support base.

4. The sample injection device for a gas chromatograph according to claim 3, characterized in that, The adjusting block is provided with threaded holes that pass through the opposite ends of the adjusting block. The threaded adjusting rod passes through the threaded holes and is threadedly connected to the adjusting block.

5. The sample injection device for a gas chromatograph according to claim 3, characterized in that, The support base has a guide groove with the groove opening facing upwards. The threaded adjusting rod is rotatably disposed within the guide groove, and the adjusting block is located within the guide groove. The longitudinal section of the guide groove matches the outer contour of the adjusting block, thereby restricting the adjusting block to slide only in a straight line along the guide groove.

6. The sample injection device for a gas chromatograph according to claim 5, characterized in that, The guide groove extends along the length of the support base, and the drive motor and the injection needle mechanism are located at opposite ends of the support base.

7. The sample injection device for a gas chromatograph according to claim 1, characterized in that, Of the support base and the operating platform, one is provided with a positioning groove and the other is provided with a positioning protrusion. The test tube receiving box mechanism makes way for the operating space, and when the positioning protrusion is inserted into the positioning groove, the operating platform can be positioned and connected to the support base.

8. The sample injection device for a gas chromatograph according to claim 7, characterized in that, When the operating platform is positioned and connected to the support base, the operating platform is located between the test tube container mechanism and the injection needle mechanism.

9. The sample introduction device for a gas chromatograph according to claim 7, characterized in that, The positioning grooves are distributed on opposite sides of the linear drive mechanism.

10. The sample introduction device for a gas chromatograph according to claim 7, characterized in that, The operating platform includes a platform plate, and the positioning protrusion is fixed to the bottom corner of the platform plate.

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