A quick-release sampling needle retaining ring assembly / disassembly structure

Abstract

This utility model discloses a quick-release sampling needle retaining ring assembly / disassembly structure. The sampling needle is mounted on an instrument mounting base. The assembly / disassembly structure includes a retaining ring sleeved on the sampling needle. An assembly hole is provided on the end face of the mounting base, and an opening communicating with the side wall of the mounting base is constructed on the inner wall of the assembly hole. The retaining ring includes a main body and flanges at both ends of the main body. A cut surface is constructed on the outer wall of the main body; the distance between the two flanges is the same as the thickness of the mounting base. After the instrument operation is completed, the retaining ring can be rotated so that the cut surface aligns with the opening, at which point the retaining ring can be easily removed from the mounting hole. Conversely, after the retaining ring is inserted into the mounting hole, rotating the retaining ring to misalign the cut surface with the opening completes the installation of the retaining ring. This utility model achieves quick assembly / disassembly of the retaining ring, reducing the time and cost of cleaning the retaining ring, and preventing cross-contamination of the instrument after cleaning.

Description

Technical Field

[0001] This utility model relates to the field of sampling needle technology, and in particular, to a quick-release sampling needle fixing ring disassembly and assembly structure. Background Technology

[0002] A sampling needle is a precision tubular tool used to collect gas, liquid, or solid samples. It is corrosion-resistant, high-temperature resistant, and highly accurate, and is widely used in environmental monitoring, industrial process control, and laboratory analysis.

[0003] For example, the sampling needle in a solid-phase extraction instrument is an indispensable core component. It is mainly used to accurately collect and transfer sample solutions and control the contact process between the sample and the solid-phase extraction column, which directly affects the extraction efficiency, reproducibility and cross-contamination prevention capabilities.

[0004] To prevent cross-contamination, cleaning the sampling needle is a crucial step in the instrument's operation. Cross-contamination can interfere with subsequent analytical results and cannot be ignored. Traditional solid-phase sampling needles are relatively long, and their lower end is typically secured with a retaining ring for concentric fixation. However, traditional retaining rings are not easily disassembled. After prolonged operation, the outer wall of the sampling needle comes into contact with the retaining ring, and over time, this contaminates the retaining ring. In subsequent operations, the contaminated retaining ring can contaminate the outer wall of the sampling needle, causing cross-contamination of experimental results. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a quick-release sampling needle fixing ring assembly / disassembly structure.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A quick-release sampling needle retaining ring assembly / disassembly structure is disclosed. The sampling needle is mounted on a mounting base of an instrument. The assembly / disassembly structure includes a retaining ring sleeved on the sampling needle. A mounting hole is formed on the end face of the mounting base. An opening communicating with the side wall of the mounting base is formed on the inner wall of the mounting hole. The retaining ring includes a main body and flanges provided at both ends of the main body. A cut surface is formed on the outer wall of the main body. The cut surface is opposite to the opening, thereby allowing the main body to be laterally inserted into the mounting hole. The cut surface is misaligned with the opening, thereby restricting the main body from laterally disengaging from the mounting hole. The distance between the two flanges is the same as the thickness of the mounting base.

[0008] Preferably, there are two symmetrically arranged cut surfaces.

[0009] Preferably, the connection between the opening and the side wall of the mounting base is provided with a positioning surface.

[0010] Preferably, the end of the central hole of the fixing ring is notched.

[0011] Preferably, a baffle is detachably provided on the side wall of the mounting base, and the baffle is adapted to cover the opening.

[0012] Preferably, the width of the positioning surface is 0.5-1.5mm.

[0013] Preferably, the baffle is bolted to the mounting base.

[0014] Preferably, a plurality of sampling needles are arranged side by side, and a single baffle is provided between two adjacent openings, with each end of the baffle used to block the two openings respectively.

[0015] The beneficial effects of this invention are as follows: After the instrument has finished operating, the retaining ring can be rotated so that the cut surface aligns with the opening, allowing for easy removal of the retaining ring from the mounting hole. Conversely, after inserting the retaining ring into the mounting hole, rotating it to misalign the cut surface with the opening completes the installation. Furthermore, the axial position of the retaining ring is not easily moved due to the limiting effect of the flanges at both ends. This invention enables rapid assembly and disassembly of the retaining ring, reducing the time and cost of cleaning the retaining ring, and minimizing the risk of cross-contamination of the instrument after cleaning. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0017] Figure 2 for Figure 1 Enlarged view of part A;

[0018] Figure 3 This is a partial bottom view of the structure of an embodiment.

[0019] Reference numerals in the attached drawings: 1. Mounting base; 2. Retaining ring; 3. Mounting hole; 4. Opening; 5. Main body; 6. Flange; 7. Cut surface; 8. Positioning surface; 9. Notch; 10. Baffle; 11. Sampling needle. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] like Figures 1 to 3As shown, a quick-release sampling needle retaining ring assembly / disassembly structure includes a retaining ring 2 that can be sleeved onto and concentrically fixed to the sampling needle. The retaining ring 2 is typically mounted on the instrument's mounting base 1. For example, in a solid-phase extraction instrument, the tip of the sampling needle is attached to a movable base, which moves towards the mounting base 1 under the drive of a driving mechanism, during which the bottom end of the sampling needle gradually passes through the retaining ring 2.

[0022] The mounting base 1 has a mounting hole 3 on its end face, and the inner wall of the mounting hole 3 has an opening 4 that connects to the side wall of the mounting base 1. It can be understood that the width of the opening 4 is necessarily smaller than the diameter of the mounting hole 3. The fixing ring 2 specifically includes a main body 5 and flanges 6 provided at both ends of the main body 5. The outer wall of the main body 5 has a cut surface 7, which makes the main body 5 have a smaller diameter at the cut surface 7.

[0023] When installing the retaining ring 2, the cut surface 7 can be aligned with the opening 4. At this time, the main body 5 can pass through the opening 4 from the side and be inserted into the mounting hole 3. Then rotate the main body 5, and the cut surface 7 will be misaligned with the opening 4. That is, the large diameter part of the main body 5 will be opposite to the opening 4, thereby preventing the main body 5 from coming out of the opening 4 from the side.

[0024] The spacing between the two flanges 6 is preferably adapted to be the same as the thickness of the mounting base 1. From Figure 2 As can be seen, the retaining ring 2, which is inserted into the mounting hole 3, will not easily move axially due to the contact between the flange 6 and the mounting base 1.

[0025] In some embodiments, two symmetrically arranged cut surfaces 7 may be provided. Furthermore, a positioning surface 8 may be constructed at the connection between the opening 4 and the side wall of the mounting base 1. The mating of the positioning surface 8 and the cut surface 7 provides guidance for the lateral insertion of the main body 5 into the mounting hole 3. To reduce the machining area of ​​the positioning surface 8, its width is preferably between 0.5 and 1.5 mm. This width can be naturally obtained by selecting the drilling position of the positioning hole (i.e., the distance between the center of the positioning hole and the side wall of the mounting base 1).

[0026] For example, a notch 9 may be constructed at the end of the central hole of the fixing ring 2 to guide the insertion of the sampling needle into the fixing ring 2.

[0027] In some embodiments, a baffle 10 is detachably connected to the side wall of the mounting base 1 by bolts. The baffle 10 can cover the opening 4, thereby further preventing the fixing ring 2 from coming out laterally from the mounting hole 3.

[0028] In one possible example, a separate baffle 10 can be provided for each opening 4 to cover it. In an example where multiple sampling needles are arranged side by side, a single baffle 10 can be provided between two adjacent openings 4, and the two openings 4 can be covered by the two ends of the baffle 10, thereby reducing the number of baffles 10 required.

[0029] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A quick-release sampling needle fixing ring assembly / disassembly structure, wherein the sampling needle is mounted on the instrument mounting base (1), characterized in that: The disassembly and assembly structure includes a fixing ring (2) sleeved on the sampling needle, and an installation hole (3) is provided on the end face of the mounting base (1). An opening (4) communicating with the side wall of the mounting base (1) is constructed on the inner wall of the installation hole (3). The fixing ring (2) includes a main body (5) and flanges (6) provided at both ends of the main body (5). A cut surface (7) is constructed on the outer wall of the main body (5). The cut surface (7) is opposite to the opening (4), thereby allowing the body (5) to be inserted laterally into the mounting hole (3); The cut surface (7) is misaligned with the opening (4), thereby restricting the body (5) from lateral dislodgement from the mounting hole (3); The distance between the two flanges (6) is the same as the thickness of the mounting base (1).

2. The quick-release sampling needle fixing ring disassembly and assembly structure according to claim 1, characterized in that: The cut surfaces (7) are symmetrically arranged in two places.

3. The quick-release sampling needle retaining ring assembly / disassembly structure according to claim 1 or 2, characterized in that: The connection between the opening (4) and the side wall of the mounting base (1) is provided with a positioning surface (8).

4. The quick-release sampling needle retaining ring assembly / disassembly structure according to claim 1 or 2, characterized in that: The end of the central hole of the fixing ring (2) is constructed with a notch (9).

5. The quick-release sampling needle retaining ring disassembly and assembly structure according to claim 1 or 2, characterized in that: A baffle (10) is detachably provided on the side wall of the mounting base (1), and the baffle (10) is adapted to cover the opening (4).

6. The quick-release sampling needle retaining ring assembly / disassembly structure according to claim 3, characterized in that: The width of the positioning surface (8) is 0.5-1.5mm.

7. The quick-release sampling needle fixing ring disassembly and assembly structure according to claim 5, characterized in that: The baffle (10) is bolted to the mounting base (1).

8. The quick-release sampling needle fixing ring disassembly and assembly structure according to claim 5, characterized in that: Several sampling needles are arranged side by side, and a single baffle (10) is provided between two adjacent openings (4). The two ends of the baffle (10) are used to block the two openings (4) respectively.

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