Liquid chromatograph needle protection assembly for food detection

Abstract

The utility model belongs to the technical field of auxiliary detection devices, and relates to a liquid chromatograph needle protection component for food detection, which comprises a needle, a needle tube and a guide protection component, the guide protection component is sleeved on the outer surface of the needle tube, the needle is positioned at the axis of the guide protection component, and the guide protection component is movably connected with the needle; the guide protection assembly comprises a guide assembly and an installation block, the guide assembly is movably connected to the installation block, the installation block is arranged on the outer surface of the needle tube in a sleeving mode, and the guide assembly is movably connected to the needle head through a positioning ring. The needle head can be guided to be smoothly aligned with the sample injection hole of the sample injection structure through the guide protection assembly, stress is dispersed for the needle head so that the needle head can be kept vertical, the needle head is effectively protected, the risk that the needle head is bent and broken due to misoperation is reduced, and the service life of the needle head and equipment is prolonged; the use cost is reduced, the needle breakage is avoided, the detection period is prolonged, and the working efficiency of sampling operation is remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of detection auxiliary devices, in particular to a needle protection component for a liquid chromatograph used in food detection. Background Technique

[0002] In the field of food detection, as an efficient and sensitive analysis tool, the liquid chromatograph is widely used in the detection of various items such as pesticide residues, microbial quantity, total number of colonies, quantity of Escherichia coli, nutritional components, and physical and chemical indexes.

[0003] Due to the relatively long length of the injection needle, its mechanical strength is relatively low, and it is prone to bending or breaking under the influence of various factors during the injection process. This not only affects the accuracy and reliability of the detection, but also brings unnecessary economic losses due to frequent needle replacement. When the needle breaks during the injection process, the detection cycle is prolonged, the work efficiency is reduced, and the part remaining in the liquid chromatograph is often difficult to remove, which not only increases the workload of maintenance, but also may damage other components of the liquid chromatograph, further reducing the detection efficiency and the service life of the equipment. Summary of the Utility Model

[0004] In order to solve the problems that the existing injection needles of liquid chromatographs are easy to bend and break, the utility model provides a needle protection component for a liquid chromatograph used in food detection.

[0005] The technical solution of the utility model is realized through the following scheme: A needle protection component for a liquid chromatograph used in food detection, including a needle, a syringe barrel, and a guiding and protecting component. The guiding and protecting component is sleeved on the outer surface of the syringe barrel, the needle is located at the axis center of the guiding and protecting component, and the guiding and protecting component is movably connected to the needle.

[0006] The guiding and protecting component includes a guiding component and a mounting block. The guiding component is movably connected to the mounting block. The mounting block is sleeved on the outer surface of the syringe barrel. The guiding component is movably connected to the needle through a positioning ring.

[0007] Through the above technical solution, the guiding and protecting component can guide the needle to align with the injection hole of the injection structure smoothly and disperse the force on the needle to keep it vertical, effectively protecting the needle, reducing the risk of the needle bending and breaking due to improper operation, prolonging the service life of the needle and the equipment, reducing the use cost, avoiding the extension of the detection cycle caused by the needle breakage, and significantly improving the work efficiency of the injection operation.

[0008] Preferably, the guiding component includes a contact piece, a plurality of guiding rods, and an anti - detachment ring. A plurality of guiding rods are installed between the contact piece and the anti - detachment ring. The plurality of guiding rods are arranged in a circumferential manner. The contact piece is movably connected to the needle through a positioning ring.

[0009] Preferably, the mounting block is located between the anti-slip ring and the contact piece, a side of the contact piece away from the guide rod is provided with a limiting convex ring, and a side of the contact piece close to the guide rod is provided with a guiding ring.

[0010] Preferably, the guide ring abuts against the positioning ring, and the needle is connected to the positioning ring via the guide ring.

[0011] Through the above technical solution, the guide rod in the guide assembly is arranged in a circle to form a cylindrical cage with the contact piece and the anti-slip ring, which surrounds and covers the needle to form a physical barrier, effectively reducing the risk of accidentally touching the needle during operation, thereby improving the safety of operation. The guide ring, limit convex ring and other designs on the contact piece enable the staff to quickly find the position of the positioning ring, realize the rapid installation of the entire device, and at the same time ensure the alignment of the needle and the injection hole, thereby improving the accuracy of injection.

[0012] Preferably, the mounting block comprises a sleeve mold and a plurality of through holes, the sleeve mold is provided with a plurality of through holes, the guide assembly is slidably connected to the sleeve mold via the plurality of through holes, and the sleeve mold is sleeved on the outer surface of the needle tube.

[0013] Preferably, the inner surface of the sleeve mold is provided with an anti-slip inner sleeve, and the sleeve mold is clamped with the needle tube through a limiting inner ring.

[0014] Preferably, the outer surface of the sleeve mold is provided with anti-slip grooves.

[0015] Through the above technical scheme, the through hole ensures the flexible movement of the guide component and ensures its stability during the movement, thereby improving the accuracy and reliability of the injection operation. The anti-slip inner sleeve arranged on the inner surface of the sleeve mold and the design of clamping the needle tube through the limiting inner ring jointly ensure that the needle tube can be firmly fixed in the mounting block, thereby improving the stability and safety of the entire device and reducing the shaking of the component. The anti-slip grooves arranged on the outer surface of the sleeve mold effectively improve the anti-slip performance of the operator during holding or use.

[0016] In summary, the utility model has the following beneficial effects:

[0017] 1. The utility model can guide the needle to align smoothly with the injection hole of the injection structure through the guide protection component, and disperse the force on the needle to keep it vertical, effectively protecting the needle, reducing the risk of the needle bending and breaking due to improper operation, extending the service life of the needle and the equipment, reducing the cost of use, avoiding the extension of the detection cycle due to needle breakage, and significantly improving the work efficiency of the injection operation.

[0018] 2. The guide rods in the guiding assembly are arranged in a circle and form a cylindrical cage together with the contact pieces and the anti - detachment rings, surrounding and covering the needle, forming a physical barrier, effectively reducing the risk of accidentally touching the needle during operation, thereby improving the safety of operation. Designs such as the guiding rings and limiting convex rings on the contact pieces enable the staff to quickly find the position of the positioning ring, realize the rapid installation of the whole device, and at the same time ensure the alignment of the needle and the sampling hole, improving the accuracy of sampling.

[0019] 3. The through - hole not only ensures the flexible movement of the guiding assembly but also ensures its stability during movement, thereby improving the accuracy and reliability of the sampling operation. The anti - slip inner sleeve provided on the inner surface of the sleeve mold and the design of clamping the syringe tube through the limiting inner ring jointly ensure that the syringe tube can be firmly fixed in the mounting block, improving the stability and safety of the whole device and reducing the shaking of the components. The anti - slip lines provided on the outer surface of the sleeve mold effectively improve the anti - slip performance of the operator during holding or use. Description of the Drawings

[0020] Figure 1 is a schematic half - section structure view of the present utility model;

[0021] Figure 2 is a three - dimensional structure view of the working state of the present utility model;

[0022] Figure 3 is a three - dimensional structure view of the present utility model;

[0023] Figure 4 is a main - perspective structure view of the present utility model;

[0024] Figure 5 is Figure 1 an enlarged structure view of part A of

[0025] Description of the reference numerals in the drawings: 1, guiding assembly; 11, contact piece; 12, guide rod; 13, anti - detachment ring; 2, mounting block; 21, sleeve mold; 22, through - hole; 3, limiting convex ring; 4, limiting inner ring; 5, positioning ring; 6, guiding ring; 7, anti - slip inner sleeve; 8, anti - slip line. Detailed Description of the Preferred Embodiment

[0026] In order to more clearly understand the above - mentioned objects, features, and advantages of the present utility model, the following further describes the present utility model with reference to the drawings and embodiments.

[0027] In the following description, many specific details are set forth to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed in the following specification. The following further details the present utility model with reference to the drawings.

[0028] A needle protection component for a liquid chromatograph used in food detection, as Figures 1-5 shown, includes a needle, a syringe tube, and a guiding and protecting component. The guiding and protecting component is sleeved on the outer surface of the syringe tube, the needle is located at the axis of the guiding and protecting component, and the guiding and protecting component is movably connected to the needle; the guiding and protecting component includes a guiding component 1 and a mounting block 2. The guiding component 1 is movably connected to the mounting block 2. The mounting block 2 is sleeved on the outer surface of the syringe tube. The guiding component 1 is movably connected to the needle through a positioning ring 5. The guiding component 1 is slidably mounted on the mounting block 2. After the syringe tube completes sampling, this device is installed on the outer surface of the syringe tube. During subsequent injection operations, this device can, to a certain extent, fix the position of the needle and prevent it from shifting or bending during the injection process. At the same time, the guiding component 1 is slidably mounted on the mounting block 2, and the mounting block 2 is sleeved on the outer surface of the syringe tube, so that the guiding component 1 can move as the needle moves up and down, and always maintain a close fit with the needle.

[0029] The guiding component 1 includes a contact piece 11, a plurality of guiding rods 12, and an anti - detachment ring 13. A plurality of guiding rods 12 are installed between the contact piece 11 and the anti - detachment ring 13. The plurality of guiding rods 12 are arranged in a circle. The contact piece 11 is movably connected to the needle through a positioning ring 5. The mounting block 2 is located between the anti - detachment ring 13 and the contact piece 11. A limiting convex ring 3 is provided on the side of the contact piece 11 away from the guiding rods 12. A guiding ring 6 is provided on the side of the contact piece 11 close to the guiding rods 12. The guiding ring 6 abuts against the positioning ring 5. The needle is connected to the positioning ring 5 through the guiding ring 6. The outer diameter of the limiting convex ring 3 is adapted to the outer diameter of the circular piece on the injection structure of the chromatograph. During the injection operation, by clamping this device on the injection structure through the limiting convex ring 3, it can be ensured that the needle can be completely aligned with the injection hole during the injection operation of this device, avoiding needle feeding errors and improving the injection accuracy. An installation hole is vertically penetrated at the top, and a positioning ring 5 with an inner diameter adapted to the outer diameter of the needle is fixedly connected inside the installation hole. The positioning ring 5 is preferably made of rubber material to avoid applying a large extrusion force to the needle. The guiding ring 6 is frustum - shaped. The existence of the guiding ring 6 can easily enable the staff to align the position where the positioning ring 5 is located, so as to quickly install the entire device. The multiple guiding rods 12 in the guiding component 1 are in a state of covering the needle and the syringe tube. The guiding rods 12 in the guiding component 1 can cover the needle, thereby providing a physical barrier to reduce the risk of accidental touch. They are arranged in a circle around the needle. The anti - detachment ring 13 prevents the contact piece 11 and the guiding rods 12 from falling off due to gravity. The plurality of guiding rods 12, the contact piece 11, and the anti - detachment ring 13 form a cylindrical cage type.

[0030] The mounting block 2 includes a sleeve mold 21 and a number of through holes 22. A number of through holes 22 are provided in the sleeve mold 21. The guiding component 1 is slidably connected to the sleeve mold 21 through the number of through holes 22. The sleeve mold 21 is sleeved on the outer surface of the syringe needle. An anti-slip inner sleeve 7 is provided on the inner surface of the sleeve mold 21. The sleeve mold 21 is clamped to the syringe needle through a limiting inner ring 4. Anti-slip lines 8 are provided on the outer surface of the sleeve mold 21. The sleeve mold 21 is cylindrical, and a through hole adapted to the syringe needle is opened at its axis, and an anti-slip inner sleeve 7 is provided on the inner surface of the through hole. The syringe needle penetrates through the sleeve mold 21 and is not easy to loosen or slide. The limiting inner ring 4 is arranged at the penetration position. The arrangement of the limiting inner ring 4 further enhances the fixing effect of the syringe needle and reduces the risk of displacement of the syringe needle during the sample injection process. A number of guide rods 12 are respectively installed in the through holes 22 and are quickly installed by relying on the friction and the clamping of the limiting inner ring 4. This not only simplifies the operation process and improves the work efficiency, but also ensures the stability and reliability of the installation. Anti-slip lines 8 are provided on the outer surface of the sleeve mold 21, which helps to increase the stability of the operator during the holding or use process and reduces the risk of misoperation or device dropping caused by slippery hands.

[0031] Working principle: When sampling is required, the syringe needle is directly used for sampling operations. After the sampling is completed, the staff then directly installs the device on the outer surface of the syringe needle. The needle tip easily enters the positioning ring 5 through the guiding ring 6, and the mounting block 2 is sleeved on the syringe needle. At this time, when the sample injection work is carried out, the limiting convex ring 3 on the surface of the contact piece 11 is clamped on the sample injection structure. The sample injection hole, the positioning ring 5 and the needle tip are on the same axis, and the sample injection is carried out easily. When the needle tip is lowered, since the guide rod 12 can slide, it moves with the up and down movement of the needle tip and always maintains a tight fit with the needle tip to complete the guiding protection.

[0032] The above is only a preferred embodiment of the present invention and is not a limitation of the present invention in other forms. Any person skilled in the art may use the disclosed technical content to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical content of the technical solution of the present invention, any simple modification and equivalent change made to the above embodiments based on the technical essence of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims

1. A liquid chromatograph needle protection assembly for food testing, characterized in that: It includes a needle, a needle tube and a guide protection component, wherein the guide protection component is sleeved on the outer surface of the needle tube, the needle is located at the axis of the guide protection component, and the guide protection component is movably connected to the needle; The guide protection assembly comprises a guide assembly (1) and a mounting block (2), wherein the guide assembly (1) is movably connected to the mounting block (2), the mounting block (2) is sleeved on the outer surface of the needle tube, and the guide assembly (1) is movably connected to the needle head via a positioning ring (5).

2. According to claim 1, a liquid chromatograph needle protection assembly for food testing, characterized in that: The guide assembly (1) comprises a contact piece (11), a plurality of guide rods (12) and an anti-slip ring (13); a plurality of guide rods (12) are installed between the contact piece (11) and the anti-slip ring (13); the plurality of guide rods (12) are arranged in a circle; and the contact piece (11) is movably connected to a needle via a positioning ring (5).

3. A liquid chromatograph needle protection assembly for food testing according to claim 2, characterized in that: The mounting block (2) is located between the anti-slip ring (13) and the contact piece (11); a limiting convex ring (3) is provided on a side of the contact piece (11) away from the guide rod (12); and a guide ring (6) is provided on a side of the contact piece (11) close to the guide rod (12).

4. A liquid chromatograph needle protection assembly for food testing according to claim 3, characterized in that: The guide ring (6) abuts against the positioning ring (5), and the needle is connected to the positioning ring (5) via the guide ring (6).

5. The needle protection assembly for liquid chromatography for food testing according to claim 1, characterized in that: The mounting block (2) comprises a sleeve mold (21) and a plurality of through holes (22); the sleeve mold (21) is provided with a plurality of through holes (22); the guide assembly (1) is slidably connected to the sleeve mold (21) via the plurality of through holes (22); and the sleeve mold (21) is sleeved on the outer surface of the needle tube.

6. A liquid chromatograph needle protection assembly for food testing according to claim 5, characterized in that: The inner surface of the sleeve mold (21) is provided with an anti-slip inner sleeve (7), and the sleeve mold (21) is clamped with the needle tube via a limiting inner ring (4).

7. A liquid chromatograph needle protection assembly for food testing according to claim 6, characterized in that: The outer surface of the sleeve mold (21) is provided with anti-slip grooves (8).

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