Sample introduction part assembly of sample injector

Abstract

The utility model discloses a sample introduction part assembly of a sample injector, which comprises a fixed seat, a sample introduction needle and an identification module, the sample introduction needle is arranged on the fixed seat and can move up and down along with the fixed seat, the identification module comprises a first movable part and a detection part, the detection part and the fixed seat synchronously move, and the first movable part is arranged on the fixed seat. The first movable part is arranged on the fixed seat and is connected with the fixed seat in a manner of sliding up and down, when the first movable part moves downwards to abut against the sample bottle or the sample disc, the first movable part moves relative to the detection part, and the detection part can send a signal to an external controller. The sample injection device is reasonable in structure, avoids empty suction of the sample injection needle and is favorable for improving the detection efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of sample detection, in particular to a sample injection part assembly of a sample injector. Background Art

[0002] A sampler is a device or apparatus used to introduce samples into an analytical instrument. It is widely used in laboratories, particularly in chemical analysis, biomedical research, and environmental monitoring. An injection needle is typically a long, thin, needle-like tool used to introduce samples into an analytical instrument. In the laboratory, injection needles are primarily used in gas chromatography, high-performance liquid chromatography, and other techniques that require precise measurement and delivery of small sample volumes.

[0003] In production practice, it is often necessary to operate on the sample in the sample bottle. When the sample bottle at the operation position is missing or the position of the sample bottle is deviated, and it cannot be identified in time, it often causes the injection needle to suck empty air and the sample is missed, which is not conducive to ensuring the smooth progress of the detection process. Utility Model Content

[0004] The utility model discloses an injection unit assembly for a sampler, which solves the technical problem in the prior art that when a sample bottle is missing or misplaced, the sample needle may aspirate the sample empty and miss the test. The utility model has a reasonable structure, avoids empty aspiration by the sample needle, and is conducive to improving the detection efficiency. The technical solution adopted is as follows:

[0005] An injection part assembly of an injector includes a fixed seat, an injection needle and an identification module. The injection needle is arranged on the fixed seat and can move up and down with the fixed seat. The identification module includes a first movable part and a detection part. The detection part moves synchronously with the fixed seat. The first movable part is arranged on the fixed seat and is connected to the fixed seat in a slidable manner up and down. When the first movable part moves downward and collides with a sample bottle or a sample tray, the first movable part moves relative to the detection part, and the detection part can send a signal to an external controller.

[0006] Based on the above technical solution, the detection part includes an optical coupler fixedly connected to the fixed seat, the first movable part includes a baffle and a guide column fixed to the baffle, the guide column is slidably connected to the fixed seat, and when the guide column moves downward and collides with the sample bottle or sample tray, the baffle moves relative to the optical coupler, and the optical coupler sends a signal to the external controller.

[0007] Based on the above technical solution, the first movable part also includes a bottle pressing seat, the guide column is fixedly connected to the bottle pressing seat and contacts the sample bottle or sample tray downward through the bottle pressing seat, and the bottle pressing seat is provided with an injection needle avoidance hole.

[0008] On the basis of the above technical solution, the avoidance hole includes a guiding cone surface to guide the injection needle to pass through the bottle pressing seat from top to bottom.

[0009] On the basis of the above technical solution, the guide column passes through the fixing seat and is clearance-matched with the fixing seat, and a first compression spring is provided on the outer sleeve of the guide column between the fixing seat and the bottle pressing seat.

[0010] Based on the above technical solution, there are multiple guide posts symmetrically arranged on both sides of the injection needle, a horizontal plate spans across the multiple guide posts and is fixed to the guide posts, and the end of the horizontal plate is connected to the baffle.

[0011] On the basis of the above technical solution, it also includes a protection module, the injection needle is connected to the fixed seat in a movable manner up and down, and the protection module includes a second movable part that moves synchronously with the injection needle. When the injection needle moves relative to the fixed seat, the second movable part is identified and the external controller receives a signal.

[0012] On the basis of the above technical solution, the protection module also includes a hollow cavity formed in the fixed seat, the injection needle passes through the hollow cavity and the injection needle outer sleeve is provided with a second compression spring and a needle seat, the second compression spring abuts against the inner top surface of the hollow cavity upward, and the second compression spring can press the needle seat against the inner bottom surface of the hollow cavity downward, and the second compression spring is designed so that the second compression spring can overcome the resistance of the injection needle piercing the sample bottle stopper; an axial long hole for the second movable part to pass through is also provided on the side wall of the hollow cavity.

[0013] On the basis of the above technical solution, when the injection needle moves relative to the fixed seat, the detection member identifies the second movable member and sends a signal to the external controller.

[0014] On the basis of the above technical solution, it also includes a pressure cover, the hollow cavity extends upward to form an upper opening on the fixed seat, the pressure cover blocks the upper opening, and the bottom surface of the pressure cover forms the inner top surface of the hollow cavity.

[0015] Beneficial effects

[0016] The utility model has a reasonable structure and includes an identification module. When working, the fixed seat moves downward by a set distance. When the first movable part collides with the sample bottle or the sample tray, the detection part sends a signal to the external controller. In this way, it can be identified whether the sample bottle is missing or the position is deviated, and an alarm signal is sent in time to avoid the situation where the injection needle sucks empty air and misses the detection. At the same time, it can prevent the injection needle from moving further, which is beneficial to improving the detection efficiency.

[0017] The first movable part in the utility model includes a baffle, a guide column and a first compression spring. The guide columns are arranged on both sides of the injection needle and abut against the sample bottle through the bottle pressing seat. On the one hand, they can press the sample bottle when the injection needle is working, avoiding the situation where the end of the injection needle jumps due to shaking of the sample bottle, which is conducive to stable injection; on the other hand, after the injection needle finishes working, it continues to press the sample bottle, which facilitates the injection needle to separate from the sample bottle stopper and ensures stable injection; on the other hand, the first compression spring is arranged to provide a buffer for the up and down displacement of the guide column, which is conducive to ensuring the smooth movement of the guide column.

[0018] This utility model features a rational structure and includes a protective module. The second compression spring ensures that the injection needle remains in normal working order and does not deform when piercing a sample bottle stopper. If the injection needle accidentally pierces a hard surface, the second movable member moves relative to the fixed seat, and the detection member sends a signal to an external controller, effectively protecting the injection needle and extending its service life. Furthermore, both the first and second movable members can be identified by the detection member, making the structure more compact and helping to reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only one embodiment of the present invention. For those skilled in the art, other implementation drawings can be derived from the provided drawings without inventive effort.

[0020] Figure 1 : Schematic diagram of the three-dimensional structure of the utility model;

[0021] Figure 2 : Schematic diagram of the three-dimensional structure of the first movable member;

[0022] Figure 3 : Schematic diagram of the three-dimensional structure after the injection needle and protection module are assembled;

[0023] Figure 4 : Schematic diagram of the three-dimensional structure of the fixed seat;

[0024] Figure 5 : Figure 4 A schematic diagram of the cross-sectional structure of the main view of the middle fixed seat; DETAILED DESCRIPTION

[0025] The following description and accompanying drawings sufficiently illustrate the specific embodiments herein to enable those skilled in the art to practice them. Portions and features of some embodiments may be included in or substituted for portions and features of other embodiments. The scope of the embodiments herein includes the entire scope of the claims, including all available equivalents thereof. Herein, the terms "first," "second," and the like are used solely to distinguish one element from another and do not require or imply any actual relationship or order between these elements. In practice, the first element can also be referred to as the second element, and vice versa. Furthermore, the terms "comprise," "comprising," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a structure, device, or apparatus comprising a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such structure, device, or apparatus. Without further limitation, an element defined by the phrase "comprising a..." does not preclude the presence of other identical elements in the structure, device, or apparatus comprising the element. The various embodiments herein are described in a progressive manner, with each embodiment focusing on its differences from the other embodiments. Similar or identical parts between the various embodiments can be referenced to each other.

[0026] The terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used herein to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are intended only to facilitate the description of this document and simplify the description, and are not intended to indicate or imply 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 construed as a limitation on the present invention. In the description herein, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, they can be mechanical or electrical connections, or they can be internal connections between two elements, they can be directly connected, or they can be indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0027] As used herein, unless otherwise specified, the term "plurality" means two or more.

[0028] In this document, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0029] In this article, the term "and / or" is used to describe the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0030] like Figures 1 to 5The sample injection assembly of the sample injector shown includes a fixing seat 1, a sample injection needle 2, an identification module 3 and a protection module 4.

[0031] An external driving unit (not shown) can drive the fixing base 1 to move to a target position, and then the driving unit can drive the fixing base 1 to move up and down, so that the injection needle 2 completes the injection operation.

[0032] The injection needle 2 is arranged on the fixing base 1 and can move up and down with the fixing base 1;

[0033] like Figure 1 As shown, the recognition module 3 includes a first movable member 31 and a detection member 32. In this embodiment, the detection member 32 includes an optical coupler fixedly connected to the fixing base 1, so that the optical coupler can move synchronously with the fixing base 1, as shown in FIG. Figure 1 As shown, the optical coupler is arranged facing the side of the fixing base 1;

[0034] The first movable member 31 includes a baffle 311, a guide post 312 fixedly connected to the baffle 311, and a bottle pressing seat 313. Figure 2 As shown, the guide post 312 passes through the fixed seat 1 and is in clearance fit with the fixed seat 1, so that the guide post 312 is slidably connected to the fixed seat 1, and the guide post 312 is fixedly connected to the bottle pressing seat 313 downward. The bottle pressing seat 313 is provided with an injection needle avoidance hole, and the avoidance hole includes a guiding cone surface to guide the injection needle 2 to pass through the bottle pressing seat 313 from top to bottom. In addition, the guide post 312 between the fixed seat 1 and the bottle pressing seat 313 is provided with a first compression spring 314; Figure 1 As shown, there are two guide posts 312, symmetrically disposed on either side of the injection needle 2. A horizontal plate 315 spans the two guide posts 312 and is fixedly connected to the top of each guide post 312. The distal end of the horizontal plate 315 is fixedly connected to the baffle 311. The first compression spring 314 ensures that when the bottle pressing seat 313 is not in contact with the sample bottle or sample tray, the horizontal plate 315 moves downwardly to abut against the fixed seat to position the guide posts 312. When the bottle pressing seat 313 is in contact with the sample bottle or sample tray, the horizontal plate 315 acts as a buffer, allowing the guide posts 312 to move up and down smoothly and preventing the guide posts 312 from bouncing up and down due to inertia.

[0035] Preferably, under normal working conditions, the sample bottle is placed at the target position, and the fixing base 1 drives the blocking piece 311 and the guide post 312 to move downward by a distance A1 synchronously. During this process, the optical coupler always recognizes the blocking piece 311; when the fixing base continues to move downward by a distance A2, the bottle pressing base 313 abuts against the sample bottle stopper and compresses the first compression spring 314, and the guide post 312 drives the blocking piece 311 to move upward relative to the fixing base 1, that is, the blocking piece 311 is separated from the optical coupler, and at this time the optical coupler sends a signal to the external controller;

[0036] When the sample bottle at the target position is missing or deviated, the fixing base 1 moves downward by a distance A1 and then continues to move downward by a distance A2. At this time, the optical coupler still recognizes the baffle 311. The external controller can determine that the sample bottle is missing or deviated, and then send out an alarm signal, thereby avoiding the situation where the injection needle 2 is sucked empty and avoiding missed detection.

[0037] like Figure 3 As shown, the protection module 4 includes a second movable member 41 that moves synchronously with the injection needle 2, and a hollow cavity 42 formed in the fixing seat 1, as shown in FIG. Figure 4 and 5 As shown, the hollow cavity 42 extends vertically and is coaxial with the injection needle 2. The injection needle 2 passes through the hollow cavity 42 and the injection needle jacket is provided with a second compression spring 43 and a needle seat 44. The needle seat 44 is annularly fixed to the outside of the injection needle 2. The second compression spring 43 abuts against the inner top surface of the hollow cavity 42 upward, and the second compression spring 43 can press the needle seat 44 against the inner bottom surface of the hollow cavity 42 downward. In this way, the injection needle 2 is connected to the fixed seat 1 so as to be displaceable up and down.

[0038] In this embodiment, the second movable part 41 is a position sensor, which is a prior art and will not be described in detail here. The second movable part 41 is laterally fixed to the outer wall of the injection needle 2, and the side wall forming the hollow cavity 42 is also provided with an axial long hole 11 for the second movable part 41 to pass through. In this embodiment, the second compression spring 43 is designed so that the second compression spring 43 can overcome the resistance of the injection needle 2 to pierce the sample bottle stopper without deformation; when the injection needle 2 collides downward with a hard surface, such as a sample plate, a sample bottle mouth bevel, etc. under fault conditions, when the injection needle 2 moves upward relative to the fixed seat 1, the second movable part 41 moves upward close to the optical coupler and is recognized by the optical coupler, and the optical coupler sends a signal to the external controller, which then sends an alarm signal, thereby simplifying the structure and reducing costs. In other embodiments of the utility model, a second detection part is also included, which can identify the second movable part 41 and send a signal to the external controller.

[0039] like Figure 1 and 3 As shown, it also includes a pressure cover 5, and the hollow cavity 42 extends upward to form an upper opening on the fixing base 1. The pressure cover 5 blocks the upper opening, and the bottom surface of the pressure cover 5 forms the inner top surface of the hollow cavity 42. In this embodiment, the pressure cover 5 is threadedly connected to the upper part of the hollow cavity 42, so that the degree to which the pressure cover 5 extends into the hollow cavity can be adjusted, and then the degree of compression of the second compression spring 43 can be adjusted. In this way, the maximum resistance that the second compression spring 43 can overcome to the injection needle piercing the bottle stopper can be adjusted, which not only facilitates the processing and production of the fixing base 1, but also is flexible in use.

[0040] Working process

[0041] The sample bottle is placed at the target position, and the injection needle 2 corresponds to the position of the sample bottle.

[0042] When the fixing base 1 drives the baffle 311 and the guide post 312 to move downward by a distance A1, the optical coupler always recognizes the baffle 311;

[0043] When the fixing base 1 continues to move downward by a distance A2, the bottle pressing base 313 abuts against the sample bottle stopper and the injection needle 2 does not pierce the sample bottle stopper. The first compression spring 314 is further compressed. At this time, the guide column 312 drives the baffle 311 to move upward relative to the fixing base 1, that is, the baffle 311 is separated from the optical coupler. At this time, the optical coupler sends a signal to the external controller.

[0044] The fixing seat 1 continues to move downward by a distance A3, and the injection needle 2 and the second movable member 41 move synchronously, and the injection needle 2 pierces the stopper of the sample bottle and completes the injection operation.

[0045] The sample bottle is placed at the target position, but the injection needle 2 does not correspond to the position of the sample bottle.

[0046] The difference between the working process in this case and the working process in the above case is that when the fixed seat 1 continues to move downward by a distance A3, the sampling needle 2 abuts against a hard object other than the bottle stopper, and the sampling needle 2 and the second movable part 41 move upward relative to the fixed seat 1, and the optical coupler recognizes the second movable part 41 and sends a signal to the external controller.

[0047] Vial missing from target location

[0048] When the fixing base 1 continues to move downward by a distance A2, the optical coupler still recognizes the blocking piece 311 because the sample bottle is missing at the target position. The optical coupler does not send a signal to the external controller, which then determines that the sample bottle is missing and sends an alarm signal.

[0049] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments. Any changes or modifications based on the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A sample injection assembly of a sample injector, characterized in that: The invention comprises a fixed seat (1), an injection needle (2) and an identification module (3), wherein the injection needle (2) is arranged on the fixed seat (1) and can move up and down with the fixed seat (1), and the identification module (3) comprises a first movable member (31) and a detection member (32), wherein the detection member (32) moves synchronously with the fixed seat (1), and the first movable member (31) is arranged on the fixed seat (1) and is connected to the fixed seat (1) in a slidable manner up and down. When the first movable member (31) moves downward and contacts a sample bottle or a sample tray, the first movable member (31) moves relative to the detection member (32), and the detection member (32) can send a signal to an external controller.

2. The sample injection assembly of the sample injector according to claim 1, characterized in that: The detection member (32) includes an optical coupler fixedly connected to the fixed seat (1), the first movable member (31) includes a baffle (311) and a guide column (312) fixedly connected to the baffle (311), the guide column (312) is slidably connected to the fixed seat (1), and when the guide column (312) moves downward and contacts the sample bottle or the sample tray, the baffle (311) moves relative to the optical coupler, and the optical coupler sends a signal to an external controller.

3. The sample injection assembly of the sample injector according to claim 2, characterized in that: The first movable part (31) further comprises a bottle pressing seat (313), the guide column (312) is fixedly connected to the bottle pressing seat (313) and contacts the sample bottle or sample tray downward through the bottle pressing seat (313), and a relief hole for the injection needle (2) is provided on the bottle pressing seat (313).

4. The sample injection assembly of the sample injector according to claim 3, characterized in that: The avoidance hole includes a guiding cone surface to guide the injection needle (2) to pass through the pressure bottle seat (313) from top to bottom.

5. The sample injection assembly of the sample injector according to claim 3, characterized in that: The guide column (312) passes through the fixing seat (1) and is clearance-matched with the fixing seat (1). A first compression spring (314) is provided on the outer sleeve of the guide column (312) between the fixing seat (1) and the bottle pressing seat (313).

6. The sample injection assembly of the sample injector according to claim 5, characterized in that: There are multiple guide posts (312) symmetrically arranged on both sides of the injection needle (2). A horizontal plate (315) spans across the multiple guide posts (312) and is fixed to the guide posts (312). The end of the horizontal plate (315) is connected to the baffle (311).

7. The sample injection assembly of any one of claims 1 to 6, characterized in that: The device further comprises a protection module (4), wherein the injection needle (2) is connected to the fixing seat (1) in an upward and downwardly displaceable manner, and the protection module (4) comprises a second movable member (41) that moves synchronously with the injection needle (2). When the injection needle (2) moves relative to the fixing seat (1), the second movable member (41) is identified and the external controller receives a signal.

8. The sample injection assembly of the sample injector according to claim 7, characterized in that: The protection module (4) also includes a hollow cavity (42) formed in the fixed seat (1), the injection needle (2) passes through the hollow cavity (42) and the injection needle (2) is provided with a second compression spring (43) and a needle seat (44) on its outer sleeve, the second compression spring (43) abuts against the inner top surface of the hollow cavity (42) upward, and the second compression spring (43) can press the needle seat (44) against the inner bottom surface of the hollow cavity (42) downward, and the second compression spring (43) is designed so that the second compression spring (43) can overcome the resistance of the injection needle piercing the sample bottle stopper; an axial long hole (11) for the second movable part (41) to pass through is also provided on the side wall forming the hollow cavity (42).

9. The sample injection assembly of the sample injector according to claim 8, characterized in that: When the injection needle (2) is displaced relative to the fixed seat (1), the detection member (32) identifies the second movable member (41) and sends a signal to an external controller.

10. The sample injection assembly of the sample injector according to claim 8, characterized in that: It also includes a pressure cover (5), the hollow cavity (42) extends upward to form an upper opening on the fixing seat (1), the pressure cover (5) blocks the upper opening, and the bottom surface of the pressure cover (5) forms the inner top surface of the hollow cavity (42).

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