Manual sampling needle quantifying device for gas chromatograph

Abstract

The utility model discloses a manual injection needle quantifying device for a gas chromatograph, which comprises a push rod and a needle cylinder, the quantifying device comprises a positioning slide block, a quantifying pull rod and a balancing slide block, the push rod is movably arranged in the needle cylinder, the positioning pull rod is connected with the push rod, the positioning slide block is fixedly connected with the needle cylinder, and the balancing slide block is fixedly connected with the needle cylinder. The balance sliding block is connected with the needle cylinder in a sliding mode, the positioning pull rod is fixedly connected with the balance sliding block, and the positioning pull rod is connected with the positioning sliding block in a sliding mode. The quantitative sampling device has the beneficial effects that the sampling amount can be quickly and accurately fixed by moving the pull rod of the device to a corresponding scale, and the problem of large quantitative error of manual sampling is solved; the operation difficulty of a user of the gas chromatograph is reduced, so that the production and debugging of the gas chromatograph are facilitated, the operation and use of the user of the gas chromatograph are facilitated, particularly, the gas chromatograph is widely applied to the detection industries of environmental protection, food safety and the like, and the detection efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of gas chromatography technology, specifically to a quantitative device for manual injection needles in gas chromatographs. Background Technology

[0002] Gas chromatographs typically employ various injection methods, including manual injection, automated injection, headspace injection, solid-phase microextraction, and liquid chromatography. Manual injection is the most direct and widely used. According to the national standard "Verification Procedure for Gas Chromatographs," the relative standard deviation (RSD) of quantitative repeatability for sample analysis must not exceed 3%. While automated injection systems and other sample preparation equipment are considered automated and meet this requirement, manual injection significantly impacts repeatability due to operator skill and the consistency of sample volume. To ensure the validity of experimental data, operators must slow down the sampling speed and carefully observe the syringe needle scale to ensure accurate and consistent sample volume. This wastes considerable time and significantly reduces testing efficiency. Many gas chromatograph users are forced to purchase expensive automated injectors to address the difficulty of quantitative repeatability in sample injection and ensure successful testing. Utility Model Content

[0003] The purpose of this invention is to provide a quantitative device for manual injection needles in gas chromatographs to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a quantitative device for a manual injection needle in a gas chromatograph, comprising a push rod and a syringe, wherein the quantitative device includes a positioning slider, a quantitative pull rod, and a balancing slider, the push rod is movably disposed inside the syringe, the quantitative pull rod is connected to the push rod, the positioning slider is fixedly connected to the syringe, the balancing slider is slidably connected to the syringe, the quantitative pull rod is fixedly connected to the balancing slider, and the quantitative pull rod is slidably connected to the positioning slider.

[0005] Preferably, the positioning slider includes a slider body, the slider body has a vertical center positioning hole and a side positioning hole at its center, the center positioning hole is sleeved on the syringe, and the quantitative pull rod is movably disposed in the side positioning hole.

[0006] Preferably, the slider body is provided with horizontally distributed positioning slider locking screws and spring wires, the positioning slider locking screws are connected to the central positioning hole, and the spring wires are connected to the side positioning holes.

[0007] Preferably, the quantitative pull rod includes a limiting rod and a sliding rod, the sliding rod being vertically disposed at both ends of the limiting rod, and the limiting rod having a limiting hole at its center.

[0008] Preferably, the balance slider has a sliding hole at its center, and the sliding hole is slidably connected to the syringe.

[0009] Preferably, locking pins are provided on both sides of the sliding hole.

[0010] Compared with existing technologies, the beneficial effects of this invention are as follows: By setting up a quantitative pull rod, a positioning slider, and a balance slider, this invention eliminates the need for the operator to specifically observe the injection needle scale to adjust the injection needle push rod. Simply moving the pull rod of the device to the corresponding scale allows for quick and accurate fixing of the injection volume. This easily achieves quantitative repeatability with a relative standard deviation of less than 0.5% during sample analysis, completely eliminating the problem of large errors in manual injection quantification. It also reduces the operational difficulty for gas chromatograph users, facilitating gas chromatograph production and debugging, and improving user operation. In particular, gas chromatographs are widely used in environmental protection, food safety, and other testing industries, thus improving detection efficiency. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a schematic diagram of the positioning slider structure of this utility model;

[0013] Figure 3 This is a schematic diagram of the quantitative tie rod structure of this utility model;

[0014] Figure 4 This is a schematic diagram of the balance slider structure of this utility model. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figures 1 to 4 This utility model provides a technical solution: a quantitative device for a manual injection needle in a gas chromatograph, the injection device including a push rod 101 and a syringe 102, the quantitative device including a positioning slider, a quantitative pull rod 204 and a balancing slider 205, the push rod 101 being movably disposed within the syringe 102, the quantitative pull rod 204 restricting the movement of the push rod 101, the positioning slider being fixedly connected to the syringe 102, the balancing slider 205 being slidably connected to the syringe 102, the quantitative pull rod 204 being fixedly connected to the balancing slider 205, and the quantitative pull rod 204 being slidably connected to the balancing slider 205.

[0017] In one embodiment of the present invention, the positioning slider includes a slider body 203. The slider body 203 has a vertical center positioning hole 2031 and a side positioning hole 2032 at its center. The positioning hole 2031 is sleeved on the syringe 102, and the quantitative pull rod 204 is movably disposed in the side positioning hole 2032.

[0018] In one embodiment of the present invention, the slider body 203 is provided with horizontally distributed positioning slider locking screws 201 and spring wires 202. The positioning slider locking screws 201 are connected to the central positioning hole 2031, and the spring wires 202 are connected to the side positioning holes 2032.

[0019] In one embodiment of the present invention, the quantitative pull rod 204 includes a limiting rod 2041 and a sliding rod 2042. The sliding rod 2042 is vertically disposed at both ends of the limiting rod 2041, and the limiting rod 2041 has a limiting hole 2043 at its center.

[0020] In one embodiment of the present invention, the center of the balance slider 205 is provided with a sliding hole 2051, and the sliding hole 2051 is slidably connected to the syringe 102.

[0021] In one embodiment of the present invention, locking pins 2052 are provided on both sides of the sliding hole 2051.

[0022] Specifically, during use, the injection needle and the quantitative device need to be assembled. The procedure is as follows: First, place the injection needle into the device, push the injection needle pusher 101 to the 0 position, then move the quantitative pull rod 204 to the 0 mark groove. Next, press the injection needle pusher 101 firmly in the 0 position and gently move the positioning slider so that the upper end of the quantitative pull rod 204 is close to the injection needle pusher 101 to set the quantitative device to the 0 position. Finally, tighten the locking screw 201 of the positioning slider 203 to complete the positioning and installation of the positioning slider body 203 and the injection needle. Finally, gently move the balance slider 205 to the end of the pull rod, exposing the 0 mark of the injection needle, and then tighten the locking pin 2052 of the balance slider 205.

[0023] In a specific embodiment of this invention, the injection volume is 1 μL. First, press the injection needle pusher 101 to the 0 position, and the quantitative pull rod 204 will also return to the 0 position. Then, operate the pusher normally for sampling and venting. When officially quantitatively extracting 1 μL, first pull the injection needle pusher beyond the 1 μL position, and then gently pull the quantitative pull rod to the 1 μL mark. As the quantitative pull rod is pulled up, the spring wire springs out. When it reaches the 1 μL mark, the spring wire is embedded in the scale groove, and the quantitative pull rod is locked at the 1 μL position. At this time, gently push the injection needle pusher to be close to the quantitative pull rod. It is not necessary to carefully watch the 1 μL mark on the injection needle to ensure that the injection needle pusher is at the 1 μL position, and the extracted sample is 1 μL. This method is simple and the sampling and quantitative consistency is stable. When injecting the sample, press the end of the injection needle push rod with a little force. The quantitative pull rod will cause the spring wire of the quantitative device to spring open, and the pull rod of the quantitative assembly will be pushed away from the 1μL mark. The limiting effect will be released, the injection needle push rod will be pressed, and the sample will be injected normally.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A quantitative device for manual injection needle in a gas chromatograph, characterized in that, The device includes a push rod (101) and a syringe (102). The metering device includes a positioning slider, a metering lever (204), and a balancing slider (205). The push rod (101) is movably disposed inside the syringe (102). The metering lever (204) is connected to the push rod (101). The positioning slider is fixedly connected to the syringe (102). The balancing slider (205) is slidably connected to the syringe (102). The metering lever (204) is fixedly connected to the balancing slider (205). The metering lever (204) is slidably connected to the positioning slider.

2. The quantitative device for manual injection needle in a gas chromatograph according to claim 1, characterized in that: The positioning slider includes a slider body (203), the slider body (203) has a vertical center positioning hole (2031) and a side positioning hole (2032) at its center, the center positioning hole (2031) is sleeved on the syringe (102), and the quantitative pull rod (204) is movably disposed in the side positioning hole (2032).

3. A quantitative device for manual injection needle in a gas chromatograph according to claim 2, characterized in that: The slider body (203) is provided with horizontally distributed positioning slider locking screws (201) and spring wires (202). The positioning slider locking screws (201) are connected to the central positioning hole (2031), and the spring wires (202) are connected to the side positioning holes (2032).

4. A quantitative device for manual injection needle in a gas chromatograph according to claim 3, characterized in that: The quantitative pull rod (204) includes a limiting rod (2041) and a sliding rod (2042). The sliding rod (2042) is vertically disposed at both ends of the limiting rod (2041), and the limiting rod (2041) has a limiting hole (2043) at its center.

5. A quantitative device for manual injection needle in a gas chromatograph according to claim 4, characterized in that: The center of the balance slider (205) is provided with a sliding hole (2051), and the sliding hole (2051) is slidably connected to the syringe (102).

6. A quantitative device for manual injection needle in a gas chromatograph according to claim 5, characterized in that: Locking pins (2052) are provided on both sides of the sliding hole (2051).

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