Auxiliary device for food safety detection

Abstract

The invention relates to an auxiliary device for food safety detection, and belongs to the technical field of gas chromatography detection.The auxiliary device comprises a supporting pipe, a bearing plate is horizontally arranged in the supporting pipe, the bearing plate is slidably connected with the supporting pipe in the center line direction of the supporting pipe, and a first through hole is formed in the bearing plate and is coaxial with the center line of the supporting pipe; the needle head penetrates through the first through hole, the tail of the sample injection needle abuts against the bearing plate, the sample injection needle vertically and downwards moves along the center line of the supporting pipe, the sample injection needle penetrates through the first through hole, the sample injection needle is clamped in the bearing plate, and the two pleated supporting plates are arranged in the supporting pipe and are symmetrical about the center line of the supporting pipe and stretch out and draw back in the direction of the center line of the supporting pipe. The wave crests on the sides, close to each other, of the two pleated supporting plates abut against the needle head, the needle head is clamped and perpendicularly inserted into a sample injection hole of the gas chromatograph, the pleated supporting plates can keep the needle head stable, the wave crests of the pleated supporting plates make point contact with the needle head, friction force between the pleated supporting plates and the needle head is reduced, and the sample injection efficiency is improved. Therefore, the needle head is prevented from being bent during sample injection.

Description

Technical Field

[0001] The invention belongs to the technical field of gas chromatography detection, and in particular relates to an auxiliary device for food safety detection. Background Art

[0002] Chromatographic analysis, due to its high efficiency, precision, and flexibility, has become a commonly used technique in food testing. Chromatographic analysis involves introducing the food to be tested into the injection port of a gas chromatograph (GC) or liquid chromatograph (HPLC), and then separating the components in the food based on differences in distribution and affinity, thereby accurately obtaining information about the food's composition. However, compared to HPLC, GC offers higher sensitivity and separation efficiency, especially when analyzing complex samples. GC can also be used to detect trace contaminants in food (such as pesticide residues and environmental pollutants), making it the preferred instrument for food testing.

[0003] There are two ways to inject samples into GC: manual and automatic. For some foods with complex ingredients or special physical properties, special pretreatment or dissolution is required before injection. Manual injection is often used for these foods, which allows for flexible adjustment of the injection volume according to the characteristics of the sample to ensure the accuracy of the gas chromatography analysis results. During testing, after the sample is prepared, a certain amount of sample is inhaled using an injection needle, and then the needle of the injection needle is inserted through the rubber stopper on the GC injection hole. After steadily pushing the piston of the injection needle to introduce the sample into the GC, the injection needle is immediately pulled out of the injection hole. The needle of the injection needle needs to be kept vertical when inserted into the GC injection hole. Once the needle contacts the hot surface inside the injection hole, it is easy to cause the sample in the injection needle to evaporate prematurely, resulting in insufficient sample volume, thereby affecting the accuracy of the food testing and analysis results.

[0004] Currently, existing technologies often utilize a vertically mounted guide tube over the GC injection port. This guide tube maintains the needle's vertical position during insertion, preventing contact with hot surfaces inside the port and ensuring accurate food testing and analysis results. However, the guide tube's inner diameter must be as close to the needle's outer diameter as possible to achieve near-vertical insertion. This friction creates significant resistance at the tip of the needle as it passes through the guide tube, which can easily cause the needle to bend. This bending, particularly in the middle of the needle, can lead to inability to continue injection and the need to replace the needle and repeat the procedure. Summary of the Invention

[0005] In view of this, the present invention provides an auxiliary device for food safety testing to address the deficiencies in the prior art. The present invention enables the needle to be vertically inserted into the injection hole of a gas chromatograph, thereby preventing the needle from bending during injection and achieving smooth injection of auxiliary gas chromatography food testing.

[0006] The technical solution of the present invention is: an auxiliary device for food safety testing, comprising a support tube, one end of which is sleeved on a diaphragm nut outside the injection hole of a gas chromatograph, the support tube and the diaphragm nut are cooperatively connected, the support tube is coaxial with the center line of the injection hole, the carrying plate is horizontally arranged in the support tube, the carrying plate is slidably connected to the support tube along the center line direction of the support tube, a first through hole is opened on the carrying plate and is coaxial with the center line of the support tube, the needle of the injection needle passes through the first through hole from the side of the carrying plate away from the injection hole, the tail of the injection needle abuts against the carrying plate, two pleated support plates are arranged in the support tube and symmetrically arranged about the center line, the pleated support plates are retracted and retracted along the center line direction of the support tube, the crests or troughs of the two pleated support plates are opposite to each other, one end of the pleated support plate is fixedly connected to the side of the carrying plate away from the injection needle, and the other end is connected to the support tube, when the injection needle is pushed to move toward the injection hole, the pleated support plate contracts, and the crests on the sides of the two pleated support plates close to each other abut against the outer side of the needle head of the injection needle to clamp the needle.

[0007] Preferably, a first through groove is opened on the wave crest of the two pleated support plates close to each other, and the first through groove is arranged along the extension and contraction direction of the pleated support plates. When the pleated support plates shrink, the needle head of the injection needle is embedded in the first through groove and abuts against its inner wall.

[0008] Preferably, two guide rods are provided on the supporting plate in the direction of the center line of the first through hole, the guide rods are located on the outside of the two pleated support plates, the two ends of the guide rods are connected to the support tubes, and the supporting plate is slidably connected to the guide rods along the length direction.

[0009] Preferably, a second through groove is opened on the crest of the two pleated support plates away from each other, and the second through groove is arranged along the extension and contraction direction of the pleated support plates. When the pleated support plates are contracted, the guide rod is embedded in the second through groove and abuts against its inner wall.

[0010] Preferably, it also includes: a guide tube, which is arranged at one end of the support tube close to the pleated support plate, the guide tube is coaxial with the center line of the support tube, the guide tube is fixedly connected to the support tube through a connecting frame, and one end of the guide tube abuts against the end of the gas chromatograph injection hole and is connected thereto.

[0011] Preferably, the inner diameter of the guide tube gradually decreases from one end close to the pleated support plate to the other end.

[0012] Preferably, an elastic clamping mechanism is fixedly provided on a side of the carrier plate away from the pleated support plate, and the elastic clamping mechanism is located outside the first through hole to clamp and fix the sampling needle.

[0013] Preferably, a sliding groove is provided on the outer side of the support tube along the center line thereof, and a connecting rod is fixedly provided on the outer side of the supporting plate, and the connecting rod passes through the sliding groove and extends to the outer side of the support tube.

[0014] Preferably, there are multiple corresponding sliding grooves on the support tube and connecting rods on the outer side of the load-bearing plate. A connecting ring is sleeved on the outer side of the support tube, and the ends of the connecting rods away from the load-bearing plate are fixedly connected to the connecting rings.

[0015] Compared with the prior art, the present invention provides an auxiliary device for food safety testing, which is used in conjunction with the first through hole on the supporting plate through the support tube to enable the needle to pass through the first through hole, and the tail of the injection needle abuts against the supporting plate, so that the injection needle moves vertically downward along the center line of the support tube, and then the peaks of the two pleated support plates close to each other are abutted against the needle to clamp the needle so that it is vertically inserted into the injection hole of the gas chromatograph, and the pleated support plate can keep the needle stable, and the peaks of the pleated support plate are in point contact with the needle, which reduces the friction between the pleated support plate and the needle, thereby avoiding bending of the needle during injection, and realizing smooth injection of auxiliary gas chromatography food testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a front view of the auxiliary device for detection of the present invention;

[0017] Figure 2 is a top view of the auxiliary device for detection of the present invention;

[0018] Figure 3 This invention Figure 1 AA section view in;

[0019] Figure 4 This invention Figure 1 BB cross-sectional view in;

[0020] Figure 5 This invention Figure 2 The CC section view in the figure;

[0021] Figure 6 This invention Figure 5 The enlarged schematic diagram of point D in FIG.

[0022] Figure 7 is a front view of the pleated support plate of the present invention;

[0023] Figure 8 It is a top view of the pleated support plate of the present invention. DETAILED DESCRIPTION

[0024] The present invention provides an auxiliary device for food safety detection. Figures 1 to 8 The present invention is described with reference to a structural schematic diagram of FIG.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the technical solutions of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] GC sampling methods are generally divided into manual injection and automatic injection. For some foods with complex ingredients or special physical properties, special pretreatment or dissolution is usually required before injection. In this case, manual injection is more flexible and can accurately adjust the injection volume according to the characteristics of the sample to ensure the accuracy of the gas chromatography analysis results. During the analysis process, when the sample is prepared, the operator draws a certain amount of sample through the injection needle and inserts the needle of the injection needle vertically through the rubber stopper on the GC injection hole. Subsequently, the piston of the injection needle is pushed smoothly to send the sample into the GC equipment. During this process, the injection needle should avoid contact with the hot surface inside the injection hole, because the hot surface may cause the sample to evaporate prematurely, thereby affecting the accuracy of the analysis results.

[0027] The current solution in the existing technology is usually to install a guide tube vertically on the GC injection hole, and the guide tube ensures that the injection needle is inserted in a vertical state, thereby preventing the injection needle from contacting the hot surface of the injection hole and ensuring the reliability of the analysis results. In order to achieve this, the inner diameter of the guide tube needs to be precisely matched with the outer diameter of the injection needle to ensure that the needle is inserted almost vertically into the GC injection hole. However, the needle of the injection needle will encounter a certain amount of friction resistance when passing through the guide tube, especially when the needle passes through these narrow spaces, it may bend, especially the middle part of the needle is more obvious. This bending will not only make injection difficult, but may even make the injection needle unusable, and the needle needs to be replaced and re-operated, thus affecting the smooth progress of the entire food gas chromatography test injection.

[0028] Based on the above problems, an embodiment of the present invention provides an auxiliary device for food safety testing, which is used in conjunction with a support tube and a first through hole on a carrier plate to enable the needle to pass through the first through hole, and the tail of the injection needle abuts against the carrier plate, so that the injection needle moves vertically downward along the center line of the support tube, and then the peaks of the two pleated support plates close to each other are abutted against the needle to clamp the needle so that it is vertically inserted into the injection hole of the gas chromatograph, and the pleated support plate can keep the needle stable, and the peaks of the pleated support plate are in point contact with the needle, which reduces the friction between the pleated support plate and the needle, thereby avoiding bending of the needle during injection, and realizing smooth injection of auxiliary gas chromatography food testing.

[0029] Figure 1 This is a front view of the auxiliary device for detection in this embodiment. Figure 5 This is a front CC sectional view of the auxiliary device for detection in this embodiment, as shown Figure 1 、 Figure 5 As shown, an auxiliary device for food safety detection includes a support tube 1, one end of which is sleeved on the diaphragm nut outside the injection hole of the gas chromatograph, the support tube 1 and the diaphragm nut are matched and connected, the support tube 1 is coaxial with the center line of the injection hole, the supporting plate 2 is horizontally arranged in the support tube 1, the supporting plate 2 is slidably connected to the support tube 1 along the center line direction, a first through hole 21 is opened on the supporting plate 2 and is coaxial with the center line of the support tube 1, the needle 8 of the injection needle 7 passes through the first through hole 21 from the side of the supporting plate 2 away from the injection hole, and the tail of the injection needle 7 is aligned with the supporting plate 2. The carrier plate 2 is in contact with the two pleated support plates 3, which are arranged in a symmetrical manner along the center line of the support tube 1. The pleated support plates 3 are extended and retracted along the center line of the support tube 1, and the crests or troughs of the two pleated support plates 3 are directly opposite to each other. One end of the pleated support plate 3 is fixedly connected to the side of the carrier plate 2 away from the injection needle 7, and the other end is connected to the support tube 1. When the injection needle 7 is pushed toward the injection hole, the pleated support plate 3 contracts, and the crests on the side of the two pleated support plates 3 close to each other abut against the outer side of the needle head 8 of the injection needle 7 to clamp the needle head 8.

[0030] The auxiliary device for food safety detection in this embodiment can assist manual sampling when using gas chromatography to detect food. After the inspector pre-treats or dissolves the food sample, and after the gas chromatograph and its corresponding equipment are ready, the inspector uses the injection needle 7 to absorb a certain amount of sample, and then wipes off the sample adhering to the outside of the needle 8. The inspector holds the head side of the injection needle 7 and slowly passes the needle head of the injection needle 7 downward through the first through hole 21 on the carrier plate 2 until the tail of the injection needle 7 abuts against the upper side of the carrier plate 2, so that the injection needle 7 is placed vertically on the carrier plate 2. After the needle head 8 passes through the first through hole 21, it is located between the two pleated support plates 3. The operator slowly pushes the injection needle 7 downward to move (presses down the head side of the injection needle 7, not the piston rod of the injection needle 7). When the injection needle 7 and the needle head 8 move downward toward the GC injection hole, they synchronously drive the carrier plate 2 downward. When the needle 8 is inserted into the injection hole, the two pleated support plates 3 are pressed against the needle 8, and the needle 8 is pushed down along the center line of the injection hole of the GC and slowly inserted into the rubber plug on the injection hole. The injection needle 7 is pushed downward so that the needle is inserted into the interior of the injection hole. When the needle 8 moves downward and is inserted into the injection hole, the two pleated support plates 3 clamp the needle 8 through point contact, reducing the friction between the pleated support plates 3 and the needle 8 as much as possible. This not only keeps the needle 8 stable and avoids the needle 8 from bending due to the friction resistance between the pleated support plates 3, the rubber plug and the needle 8, but also always guides the movement of the needle 8, so that the needle 8 is smoothly inserted into the injection hole of the GC, avoids the needle 8 from contacting the hot surface inside the injection hole, and realizes the smooth injection of auxiliary gas chromatography food detection.

[0031] After the needle 8 of the injection needle 7 is inserted into the injection hole of the GC, the tester steadily pushes the piston of the injection needle 7 to introduce the sample into the GC, immediately removes the injection needle vertically upward, and then starts the GC to detect the components of the introduced sample.

[0032] The pleated support plate 3 in the above embodiment is elastic. After the injection needle is taken out vertically, the pleated support plate 3 gradually stretches upward and drives the carrying plate 2 to move back to the original height range.

[0033] Figure 6 This is an enlarged schematic diagram of point D of the auxiliary device for detection in this embodiment. Figure 8 This is a top view of the pleated support plate of this embodiment, as shown in Figure 6 、 Figure 8As shown, as a further optimization solution, in this embodiment, a first through groove 31 is opened on the crest of the two pleated support plates 3 on the side close to each other, and the first through groove 31 is arranged along the extension and contraction direction of the pleated support plates 3. When the pleated support plates 3 shrink, the needle head 8 of the injection needle 7 is embedded in the first through groove 31 and abuts against its inner wall.

[0034] In this embodiment, the first through groove 31 is opened on the wave crest on the side where the two pleated support plates 3 are close to each other, so that when the sampling needle 7 drives the carrying plate 2 to move downward and drives the pleated support plate 3 to contract, the wave crest on the side where the pleated support plates 3 are close to each other gradually approaches the needle 8, and the needle 8 can be embedded in the first through groove 31. Not only can the pleated support plates 3 be used to clamp the needle 8, but the first through groove 31 can also be used to prevent the needle 8 from squeezing the pleated support plates 3, causing its wave crest to be concave and deformed, resulting in an inability to contract smoothly.

[0035] In this embodiment, the two pleated support plates 3 are close to each other and the first through groove 31 on the wave crest on one side is used to further improve the effect of clamping the needle 8 to make it stable.

[0036] As a further optimization scheme, in this embodiment, two guide rods 22 are passed through the supporting plate 2 along the center line direction of the first through hole 21. The guide rods 22 are located on the outside of the two pleated support plates 3. The two ends of the guide rods 22 are connected to the support tube 1, and the supporting plate 2 is slidingly connected to the guide rods 22 along the length direction.

[0037] In this embodiment, the guide rod 22 passed through the supporting plate 2 can improve the stability of the movement of the supporting plate 2, thereby improving the stability of the contraction and extension of the pleated support plate 3, avoiding the shaking of the pleated support plate 3 during contraction and extension, avoiding the bending of the needle 8 when inserted into the injection hole, and improving the stability of guiding the needle 8, thereby assisting the smooth injection of gas chromatography food detection.

[0038] Figure 7 This is a front view of the pleated support plate of this embodiment, as shown in Figure 7 As shown, as a further optimization solution, in this embodiment, a second through groove 32 is opened on the crest of the two pleated support plates 3 on the side away from each other, and the second through groove 32 is arranged along the extension and contraction direction of the pleated support plates 3. When the pleated support plates 3 are contracted, the guide rod 22 is embedded in the second through groove 32 and abuts against its inner wall.

[0039] In this embodiment, a second through groove 32 is opened on the crest of the side where the two pleated support plates 3 are away from each other, so that when the pleated support plates 3 are contracted, the crests of the side where the two pleated support plates 3 are away from each other are close to the guide rod 22, and the guide rod 22 is embedded in the second through groove 32, further improving the contraction stability of the pleated support plates 3, avoiding the shaking of the pleated support plates 3 during contraction and extension, preventing the needle 8 from bending when inserted into the injection hole, and further improving the stability of guiding the needle 8.

[0040] Figure 3 AA is a cross-sectional view of the auxiliary device for detection in this embodiment, as shown in FIG. Figure 3 As shown, as a further optimization solution, this embodiment also includes: a guide tube 5, which is arranged at one end of the support tube 1 close to the pleated support plate 3, the guide tube 5 is coaxial with the center line of the support tube 1, and the guide tube 5 is fixedly connected to the support tube 1 through a connecting frame, and one end of the guide tube 5 abuts against the end of the gas chromatograph injection hole and is connected thereto.

[0041] In this embodiment, the guide tube 5 is used to guide the needle 8 into the gas chromatograph injection hole, avoiding the inability to stably guide the needle 8 when the pleated support plate 3 has a weak clamping force on the needle, thereby improving the effect of assisting the gas chromatography food detection to smoothly inject samples.

[0042] In the above embodiment, a barrel body 6 is coaxially provided at the lower end of the support tube 1, the bottom of the barrel body 6 is fixedly connected to the support tube 1, the guide tube 5 is vertically passed through the bottom of the barrel body 6 and is fixedly connected thereto, and the barrel body 6 is mounted on the diaphragm nut outside the gas chromatograph injection hole and is connected with the diaphragm nut, so that the support tube 1 is coaxial with the gas chromatograph injection hole.

[0043] Specifically, the lower ends of the pleated support plate 3 and the guide rod 22 are fixedly connected to the barrel body 6, and the upper end of the support tube 1 is coaxially and detachably fixedly connected with an annular limiter. The upper end of the guide rod 22 is fixedly connected to the annular limiter, and the annular limiter can prevent the supporting plate 2 from sliding out of the support tube 1.

[0044] As a further optimization solution, in this embodiment, the inner diameter of the guide tube 5 gradually decreases from one end close to the pleated support plate 3 to the other end.

[0045] In this embodiment, the inner diameter of the guide tube 5 is gradually reduced to reduce the friction resistance between the guide tube 5 and the needle 8 when the guide tube 5 guides the front end of the needle 8, thereby avoiding the needle 8 from bending due to increased resistance when it just enters the guide tube 5, and further improving the stability of the smooth injection of auxiliary gas chromatography food detection.

[0046] In the above embodiment, the outer diameter of the guide tube 5 gradually decreases from one end close to the pleated support plate 3 to the other end, so that the end of the guide tube 5 away from the supporting plate 2 can be appropriately inserted into the rubber plug on the gas chromatograph injection hole, so that the front end of the needle can smoothly enter and pass through the rubber plug, further improving the effect of assisting the gas chromatography food detection to smoothly inject samples.

[0047] As a further optimization solution, in this embodiment, an elastic clamping mechanism is fixedly provided on the side of the carrier plate 2 away from the pleated support plate 3. The elastic clamping mechanism is located outside the first through hole 21 to clamp and fix the injection needle 7.

[0048] In this embodiment, an elastic clamping mechanism is used to clamp and fix the sampling needle 7, so that the sampling needle 7 remains stable during injection, avoiding shaking when the sampling needle 7 is pushed downward, which causes the needle head to be unstable, so that the needle head 8 can be smoothly inserted vertically into the injection hole of the GC without contacting the hot surface inside the injection hole.

[0049] Specifically, Figure 4 BB is a cross-sectional view of the auxiliary device for detection in this embodiment, as shown in FIG. Figure 4 As shown, the elastic clamping mechanism includes a clamping head 14, a sliding rod 15, an elastic member 16 and an annular support member 17. The annular support member 17 is vertically fixed on the side of the supporting plate 2 away from the pleated support plate 3 and is coaxial with the center line of the support tube 1. Multiple sliding rods 15 are radially arranged along the radial direction of the annular support member 17. The sliding rod 15 is slidably connected to the annular support member 17 along its length direction. The clamping heads 14 are respectively fixed on one end of the sliding rod 15 located inside the annular support member 17. The clamping head 14 is conical. One end of the elastic member 16 is connected to the sliding rod 15, and the other end is connected to the annular support member 17, which can drive the sliding rod 15 to slide toward the inside of the annular support member 17.

[0050] The elastic member 16 in the above embodiment can be a spring, which is sleeved on the slide rod 15 .

[0051] As a further optimization solution, in this embodiment, a slide groove 11 is opened on the outer side of the support tube 1 along its center line direction, and a connecting rod 12 is fixed on the outer side of the supporting plate 2, and the connecting rod 12 passes through the slide groove 11 and extends to the outer side of the support tube 1.

[0052] In this embodiment, the connecting rod 12 is used in conjunction with the slide groove 11 on the support tube 1, so that the connecting rod 12 can drive the supporting plate 2 to move up and down, and then drive the injection needle 7 to move up and down, thereby improving the convenience of smooth injection of auxiliary gas chromatography food testing.

[0053] Figure 2 This is a top view of the auxiliary device for detection in this embodiment, as shown in FIG. Figure 2As shown, as a further optimization solution, in this embodiment, there are multiple corresponding slide grooves 11 on the support tube 1 and connecting rods 12 on the outside of the load-bearing plate 2. A connecting ring 13 is sleeved on the outside of the support tube 1, and the ends of the connecting rods 12 away from the load-bearing plate 2 are fixedly connected to the connecting rings 13.

[0054] In this embodiment, a connecting ring 13 is used to connect the multiple connecting rods 12 on the carrier plate 2, which further facilitates the operator to manually drive the connecting rods 12, the carrier plate 2 and the injection needle 7 to move up and down.

[0055] The above disclosure is only a preferred specific embodiment of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. A food safety detection auxiliary device, characterized in that: include: A support tube (1), one end of which is sleeved on a diaphragm nut outside the injection hole of the gas chromatograph, the support tube (1) and the diaphragm nut are cooperatively connected, and the support tube (1) is coaxial with the center line of the injection hole; A carrier plate (2) is horizontally arranged in the support tube (1), and the carrier plate (2) is slidably connected to the support tube (1) along the center line direction thereof. A first through hole (21) is provided on the carrier plate (2) and is coaxial with the center line of the support tube (1). The needle head (8) of the injection needle (7) passes through the first through hole (21) from the side of the carrier plate (2) away from the injection hole, and the tail of the injection needle (7) abuts against the carrier plate (2); Two pleated support plates (3) are arranged in the support tube (1) and symmetrically arranged about its center line. The pleated support plates (3) are extended and retracted along the center line of the support tube (1). The crests or troughs of the two pleated support plates (3) are opposite to each other. One end of the pleated support plate (3) is fixedly connected to a side of the carrier plate (2) away from the injection needle (7), and the other end is connected to the support tube (1). When the injection needle (7) is pushed to move toward the injection hole, the pleated support plate (3) contracts, and the wave crests on the sides of the two pleated support plates (3) that are close to each other abut against the outer side of the needle head (8) of the injection needle (7) to clamp the needle head (8).

2. The food safety detection auxiliary device according to claim 1, characterized in that: A first through groove (31) is provided on the wave crests of the two pleated support plates (3) on the side close to each other. The first through groove (31) is arranged along the expansion and contraction direction of the pleated support plates (3). When the pleated support plates (3) contract, the needle head (8) of the injection needle (7) is embedded in the first through groove (31) and abuts against the inner wall thereof.

3. The food safety detection auxiliary device according to claim 1, characterized in that: Two guide rods (22) are provided on the supporting plate (2) along the center line direction of the first through hole (21), and the guide rods (22) are located outside the two pleated support plates (3). Both ends of the guide rods (22) are connected to the support tube (1), and the supporting plate (2) is slidably connected to the guide rods (22) along the length direction thereof.

4. The food safety detection auxiliary device according to claim 3, characterized in that: A second through groove (32) is provided on the wave crests of the two pleated support plates (3) that are away from each other. The second through groove (32) is arranged along the expansion and contraction direction of the pleated support plates (3). When the pleated support plates (3) are contracted, the guide rod (22) is embedded in the second through groove (32) and abuts against its inner wall.

5. The food safety detection auxiliary device according to claim 1, characterized in that: Also includes: A guide tube (5) is provided at one end of the support tube (1) close to the pleated support plate (3), the guide tube (5) is coaxial with the center line of the support tube (1), the guide tube (5) is fixedly connected to the support tube (1) via a connecting frame, and one end of the guide tube (5) abuts against and communicates with the end of the gas chromatograph injection hole.

6. The food safety detection auxiliary device according to claim 5, characterized in that: The inner diameter of the guide tube (5) gradually decreases from one end close to the pleated support plate (3) to the other end.

7. The food safety detection auxiliary device according to claim 1, characterized in that: An elastic clamping mechanism is fixedly provided on one side of the carrier plate (2) away from the pleated support plate (3), and the elastic clamping mechanism is located outside the first through hole (21) to clamp and fix the injection needle (7).

8. The food safety detection auxiliary device according to claim 1, characterized in that: The outer side of the support tube (1) is provided with a sliding groove (11) along the center line direction thereof, and the outer side of the support plate (2) is fixed with a connecting rod (12), and the connecting rod (12) passes through the sliding groove (11) and extends to the outer side of the support tube (1).

9. The food safety detection auxiliary device according to claim 8, characterized in that: A plurality of sliding grooves (11) on the support tube (1) and connecting rods (12) on the outside of the support plate (2) are provided in a one-to-one correspondence, a connecting ring (13) is sleeved on the outside of the support tube (1), and one end of the connecting rod (12) away from the support plate (2) is fixedly connected to the connecting ring (13).

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