Anti-collision needle structure of UHPLC (Ultra High Performance Liquid Chromatography) automatic sampler

Abstract

The utility model discloses an anti-collision needle structure of a UHPLC (Ultra High Performance Liquid Chromatography) automatic sample injector, belongs to the technical field of analytical instruments, and mainly solves the problems that a sample injection needle is easy to collide with parts such as a sample disc and a sample bottle under the condition of long-time operation or improper operation of the automatic sample injector in the prior art, so that the sample injection needle is damaged or the sample injection fails, and the sample injection efficiency is high. The anti-collision needle structure solves the problems that an existing anti-collision needle structure is complex in structure, high in cost or poor in effect even if anti-collision measures exist, and comprises an anti-collision needle photoelectric fixing metal plate, the anti-collision needle photoelectric fixing metal plate is tightly fixed to a spring fixing base through a plurality of counter bores, and a spring upper base is arranged in the spring fixing base in an inserted mode. The top of the spring upper seat is fixedly provided with an anti-collision-needle photoelectric blocking piece through two counter bores, the anti-collision-needle photoelectric blocking piece is located on one side of the anti-collision-needle photoelectric fixing metal plate, the anti-collision-needle photoelectric blocking piece can play a role in triggering photoelectricity, and a spring baffle is installed at the bottom end of the spring upper seat in a threaded mode.

Description

Technical Field

[0001] This utility model relates to the field of analytical instrument technology, and more specifically, to an anti-collision pin structure for a UHPLC autosampler. Background Technology

[0002] High-performance liquid chromatography (HPLC) is an instrument that applies the principles of high-performance liquid chromatography and is mainly used to analyze organic compounds with high boiling points, low volatility, thermal instability, and large molecular weights. It consists of several parts, including a reservoir, pump, injector, chromatographic column, detector, and recorder. Ultra-high-performance liquid chromatography (UHPLC), based on the theory and principles of HPLC, incorporates new technologies such as small-particle packing materials, very low system volume, and rapid detection methods, increasing analytical throughput, sensitivity, and peak capacity. In liquid chromatography analysis, the autosampler is a key component for achieving efficient and accurate sample injection. However, UHPLC operates at higher pressures than HPLC, and the altered flow path requires the injection needle to remain within the flow path, necessitating the maintenance of a constant force at the needle hub.

[0003] However, there are various types of autosamplers in the existing technology. For example, utility model patent CN216926713U relates to an autosampler for liquid chromatographs. This utility model includes an injection tube, the lower end of which is provided with an injection needle and a protective component, with the protective component located on the outer wall of the injection needle. The autosampler for liquid chromatographs described in this utility model, through the protective component, allows the rotating block to rotate based on the fixed block after injection, and then the first and second protective shells to rotate, so that the two cleaning components are fitted onto the outer wall of the injection needle. When the first and second protective shells are aligned based on four magnetic blocks, the four magnetic blocks attract each other, achieving fixation. At this time, the injection needle can be cleaned through the cleaning components, achieving a cleaning effect. Conversely, when the injection needle must be used, the above operation is reversed. The friction coefficient between the fixed block and the rotating block is relatively large, and the main body of the protective component will not rotate due to its own weight during the injection process, bringing better application prospects.

[0004] Although the autosampler can clean the injection needle and achieve a cleaning effect, under prolonged operation or improper operation, the injection needle is prone to collision with components such as the sample tray and sample vials, resulting in damage to the injection needle or injection failure. Moreover, even with anti-collision measures, the structure is complex, costly, or ineffective. To avoid this phenomenon, it is essential to design an anti-collision needle structure for the UHPLC autosampler. Utility Model Content

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0006] To achieve the above objectives, this utility model provides an anti-collision pin structure for a UHPLC autosampler, which is achieved through the following specific technical means:

[0007] An anti-collision pin structure for a UHPLC autosampler includes an anti-collision pin photoelectric fixing sheet metal, which is fastened to a spring fixing seat through multiple countersunk holes. A spring upper seat is inserted inside the spring fixing seat, and an anti-collision pin photoelectric baffle is fixed to the top of the spring upper seat through two countersunk holes. The anti-collision pin photoelectric baffle is located on one side of the anti-collision pin photoelectric fixing sheet metal and can trigger photoelectric action. A spring baffle is threaded onto the bottom end of the spring upper seat.

[0008] Preferably, the top of the spring fixing seat is provided with a linear bearing fixing hole, the bottom of the spring fixing seat is provided with a spring limiting hole, and the spring limiting hole is connected to the linear bearing fixing hole. The interior of the linear bearing fixing hole is fixedly connected with two circumferential limiting pins, and the two circumferential limiting pins are symmetrically distributed.

[0009] Preferably, the upper spring seat has two circumferential limiting pin holes, which are symmetrically distributed. The circumferential limiting pins can be embedded in the corresponding circumferential limiting pin holes. The circumferential limiting pin holes are used to limit the circumferential movement of the upper spring seat.

[0010] Preferably, the bottom end of the upper spring seat is provided with an external thread, and the external thread can serve to fix and adjust the spring fixing seat; the upper spring seat can be inserted into the linear bearing fixing hole and the spring limiting hole.

[0011] Preferably, the spring baffle includes a positioning baffle, a threaded inner hole, and a flange. The top of the positioning baffle has a threaded inner hole, and the threaded inner hole matches the external thread. The flange is fitted on the positioning baffle, and the flange can play an axial limiting role.

[0012] Preferably, a spring is provided on the top of the spring baffle, and the end of the spring away from the spring baffle is fixedly connected to the spring fixing seat, which can play a role in resetting. The spring is located inside the spring limiting hole, and a sampling needle is installed at the bottom of the spring baffle for injection.

[0013] Preferably, a collar is provided inside the linear bearing fixing hole, and the upper spring seat passes through the collar; an anti-collision pin photoelectric circuit board is fixed to one end of the spring fixing seat.

[0014] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0015] 1. This anti-collision pin structure can protect the safety of the instrument. Through the anti-collision mechanism, it avoids damage or malfunction of the instrument caused by collision during the sample injection process.

[0016] 2. This anti-collision pin structure is simple and highly adaptable; at the same time, it reduces maintenance costs.

[0017] 3. Based on the structural features of this utility model, the accuracy of sample injection can be improved. By precisely controlling the movement of the injection arm and injection needle, it can be ensured that the sample is accurately delivered into the analytical instrument.

[0018] In summary, the autosampler with this anti-collision pin structure is an automated sample introduction device with high precision, high safety and high efficiency. The automated sample introduction process reduces the need for manual intervention and improves analytical efficiency, playing an important role in automated analytical instruments. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the exploded structure of this utility model;

[0022] Figure 3 This is a cross-sectional view of the spring retainer.

[0023] Figure 4 This is a schematic diagram of the structure of the spring seat;

[0024] Figure 5 This is a schematic diagram of the spring baffle.

[0025] In the diagram: 1. Anti-collision pin photoelectric fixing sheet metal; 2. Anti-collision pin photoelectric baffle; 3. Spring upper seat; 4. Spring fixing seat; 5. Injection needle; 6. Spring baffle; 7. Spring; 8. Collar; 3a. Circumferential limit pin hole; 3b. External thread; 4a. Spring limit hole; 4b. Linear bearing fixing hole; 4c. Circumferential limit pin; 6a. Positioning baffle; 6b. Threaded inner hole; 6c. Flange. Detailed Implementation

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0028] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments. The present invention provides the following embodiments.

[0029] like Figure 1 as well as Figure 2 The diagram shows the anti-collision pin structure of the UHPLC autosampler in this embodiment. The anti-collision pin structure includes an anti-collision pin photoelectric fixing sheet metal 1, which is fastened to a spring fixing seat 4 through multiple countersunk holes. A spring upper seat 3 is inserted into the spring fixing seat 4. An anti-collision pin photoelectric baffle 2 is fixed to the top of the spring upper seat 3 through two countersunk holes, and the anti-collision pin photoelectric baffle 2 is located on one side of the anti-collision pin photoelectric fixing sheet metal 1. A spring baffle 6 is threaded onto the bottom end of the spring upper seat 3. A spring 7 is installed on the top of the spring baffle 6, and an injection pin 5 is installed at the bottom of the spring baffle 6. During the assembly of the autosampler, the spring upper seat 3 is inserted into the spring fixing seat 4. One end of the spring 7 is fixed to the spring baffle 6, and then the spring baffle 6 is installed on the spring upper seat 3, while the other end of the spring 7 is fixed to the spring upper seat 3. After that, the anti-collision pin photoelectric baffle 2 can be fixed to the spring upper seat 3 through two countersunk holes. After assembly, when the injection needle 5 is hit during the injection process, the moving injection needle 5 will drive the spring upper seat 3 and the anti-collision pin photoelectric baffle 2 to rise. After the anti-collision pin photoelectric baffle 2 rises, the photoelectric sensor can be triggered, thereby sending a signal to the operator and completing the function of the anti-collision pin. Thus, the anti-collision pin structure can protect the safety of the instrument and avoid damage or malfunction of the instrument due to collision during the injection process through the anti-collision mechanism. At the same time, the structure is simple and highly adaptable.

[0030] It is worth noting that in this embodiment, the end of the spring 7 away from the spring baffle 6 is fixedly connected to the spring fixing seat 4, which can play a role in resetting, and the spring 7 is located inside the spring limiting hole 4a; the injection needle 5 can be used for injection.

[0031] like Figure 3 As shown, this is a cross-sectional view of the spring fixing seat 4 in this embodiment. In this embodiment, the top of the spring fixing seat 4 is provided with a linear bearing fixing hole 4b, and the bottom of the spring fixing seat 4 is provided with a spring limiting hole 4a. The spring limiting hole 4a is connected to the linear bearing fixing hole 4b. Two circumferential limiting pins 4c are fixedly connected inside the linear bearing fixing hole 4b, and the two circumferential limiting pins 4c are symmetrically distributed. In the spring fixing seat 4, the upper spring seat 3 can be inserted into the linear bearing fixing hole 4b and the spring limiting hole 4a. The upper spring seat 3 is divided into a coarse cylindrical part at the top and a thin cylindrical part at the bottom. The coarse cylindrical part is located in the linear bearing fixing hole 4b, and the thin cylindrical part is located in the spring limiting hole 4a.

[0032] like Figure 4 As shown, this is a schematic diagram of the structure of the upper spring seat 3 in this embodiment. In this embodiment, the upper spring seat 3 has two circumferential limiting pin holes 3a, which are symmetrically distributed. The circumferential limiting pins 4c can be embedded in the corresponding circumferential limiting pin holes 3a. The bottom end of the upper spring seat 3 is provided with an external thread 3b. When the upper spring seat 3 is inserted into the spring limiting hole 4a, and the two circumferential limiting pins 4c are embedded in the circumferential limiting pin holes 3a, the upper spring seat 3 is limited and its circumferential movement is restricted. At the same time, the end of the upper spring seat 3 with the external thread 3b can be threaded onto the spring baffle 6.

[0033] like Figure 5 As shown, this is a schematic diagram of the structure of the spring baffle 6 in this embodiment. The spring baffle 6 in this embodiment includes a positioning baffle 6a, a threaded inner hole 6b, and a flange 6c. The top of the positioning baffle 6a is provided with a threaded inner hole 6b, and the threaded inner hole 6b matches the external thread 3b. During the assembly of the spring baffle 6, the threaded engagement between the threaded inner hole 6b and the external thread 3b is used to screw the end of the spring seat 3 with the external thread 3b into the threaded inner hole 6b, thereby installing the spring baffle 6. The flange 6c is fitted on the positioning baffle 6a, and the flange 6c can play an axial limiting role.

[0034] It is worth noting that in this embodiment, a collar 8 is provided inside the linear bearing fixing hole 4b, and the upper spring seat 3 passes through the collar 8; one end of the spring fixing seat 4 is fixed with an anti-collision pin photoelectric circuit board.

[0035] 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 collision-prevention pin structure for a UHPLC autosampler, comprising a collision-prevention pin photoelectric fixing sheet metal (1), wherein the collision-prevention pin photoelectric fixing sheet metal (1) is fastened to a spring fixing seat (4) through multiple countersunk holes, characterized in that: A spring upper seat (3) is inserted inside the spring fixing seat (4). The top of the spring upper seat (3) is fixed with a photoelectric baffle (2) through two countersunk holes. The photoelectric baffle (2) is located on one side of the photoelectric fixing sheet metal (1) of the photoelectric baffle. The photoelectric baffle (2) can trigger the photoelectric effect. A spring baffle (6) is threaded on the bottom end of the spring upper seat (3).

2. The anti-collision pin structure of a UHPLC autosampler according to claim 1, characterized in that: The top of the spring fixing seat (4) is provided with a linear bearing fixing hole (4b), and the bottom of the spring fixing seat (4) is provided with a spring limiting hole (4a). The spring limiting hole (4a) is connected to the linear bearing fixing hole (4b). The interior of the linear bearing fixing hole (4b) is fixedly connected with two circumferential limiting pins (4c), and the two circumferential limiting pins (4c) are symmetrically distributed.

3. The anti-collision pin structure of a UHPLC autosampler according to claim 1, characterized in that: The upper spring seat (3) has two circumferential limiting pin holes (3a) and the two circumferential limiting pin holes (3a) are symmetrically distributed. The circumferential limiting pin (4c) can be embedded in the interior of the corresponding circumferential limiting pin hole (3a). The circumferential limiting pin hole (3a) is used to limit the circumferential movement of the upper spring seat (3).

4. The anti-collision pin structure of a UHPLC autosampler according to claim 1, characterized in that: The bottom end of the upper spring seat (3) is provided with an external thread (3b), and the external thread (3b) can serve to fix and adjust the spring fixing seat (4); the upper spring seat (3) can be inserted into the linear bearing fixing hole (4b) and the spring limiting hole (4a).

5. The anti-collision pin structure of a UHPLC autosampler according to claim 1, characterized in that: The spring baffle (6) includes a positioning baffle (6a), a threaded inner hole (6b) and a flange (6c). The top of the positioning baffle (6a) is provided with a threaded inner hole (6b), and the threaded inner hole (6b) matches the external thread (3b). The flange (6c) is fitted on the positioning baffle (6a), and the flange (6c) can play an axial limiting role.

6. The anti-collision pin structure of a UHPLC autosampler according to claim 1, characterized in that: A spring (7) is provided on the top of the spring baffle (6), and the end of the spring (7) away from the spring baffle (6) is fixedly connected to the spring fixing seat (4) to play a role in resetting. The spring (7) is located inside the spring limiting hole (4a). A sample injection needle (5) is installed at the bottom of the spring baffle (6), and the sample injection needle (5) is used for sample injection.

7. The anti-collision pin structure of a UHPLC autosampler according to claim 2, characterized in that: A collar (8) is provided inside the linear bearing fixing hole (4b), and the upper spring seat (3) passes through the collar (8); one end of the spring fixing seat (4) is fixed with an anti-collision pin photoelectric circuit board.

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