Inductively coupled plasma mass spectrometer sample introduction device

Abstract

The application relates to the technical field of analytical detection, in particular to an inductively coupled plasma mass spectrometer sampling device which adopts the following technical scheme: a body, a catheter fixing part and a catheter positioning part, the catheter fixing part and the catheter positioning part are arranged on the body, the catheter fixing part is used for fixing a catheter, and the catheter positioning part is used for positioning a monitoring position of the catheter. The utility model realizes automatic switching of test tubes by means of a switching assembly, and scientific researchers do not need to repeatedly pick up and place the catheter. When it is necessary to switch the test tubes, a motor drives a support arm to rotate, drives a rotating disc to move to make a current test tube separate from a detection position, and then the rotating disc is manually rotated to switch to a target test tube. After accurate positioning by a first positioning assembly and a second positioning assembly, the motor is reversely rotated to make the target test tube enter the detection position. The whole process is coherent and efficient, the demand of rapid detection of a large quantity of samples can be met, and the labor intensity of the scientific researchers is reduced.

Description

Technical Field

[0001] This application relates to the field of analytical testing technology, and in particular to a sample introduction device for an inductively coupled plasma mass spectrometer. Background Technology

[0002] In the sample detection process of inductively coupled plasma mass spectrometry (ICP-MS), the sample introduction operation is a crucial step in ensuring detection accuracy and efficiency. Currently, traditional sample introduction methods mostly rely on manual operation by researchers: researchers need to hold the tubing and accurately place it into the corresponding test tube to complete the sample aspiration or monitoring.

[0003] However, this manual operation method has many drawbacks. Firstly, manually holding the catheter makes it difficult to ensure the stability and consistency of its position. Slight hand tremors during operation can easily cause the catheter to deviate from the preset monitoring position, affecting the accuracy of the test data. This is especially true for the detection of trace samples, where even a small positional deviation can lead to a significant detection error. Secondly, when multiple test tubes need to be tested continuously, researchers must repeatedly pick up and place the catheter, which is not only labor-intensive but also results in low sample injection efficiency due to the cumbersome operation steps, making it difficult to meet the needs of rapid detection of large batches of samples. Furthermore, the standardization of manual operation depends on the experience and proficiency of the researchers. Differences in operating habits among different personnel can lead to deviations in test results, which is detrimental to the repeatability and comparability of experimental data.

[0004] To address the aforementioned issues, there is an urgent need for a highly automated sample injection device that can fix the catheter position and replace manual hand operation through structural optimization, thereby improving the stability, accuracy, and efficiency of sample injection. This application was developed in response to this need. Utility Model Content

[0005] To address the problems mentioned in the background art, this application provides a sample introduction device for an inductively coupled plasma mass spectrometer.

[0006] This application provides a sample introduction device for an inductively coupled plasma mass spectrometer, which adopts the following technical solution: it includes a body, a catheter fixing part and a catheter positioning part, wherein the catheter fixing part and the catheter positioning part are disposed on the body, the catheter fixing part is used to fix the catheter, and the catheter positioning part is used to position the monitoring position of the catheter; it also includes a switching component, wherein the switching component includes a turntable, a plurality of test tube positioning ports machined on the turntable, a shaft, a bracket and a support arm; The test tube positioning port is used to position the test tube. The bottom of the turntable is connected to the shaft. The shaft is rotatably connected to the bracket. The bracket is connected to the support arm. The support arm is rotatably connected to the main body through a support seat.

[0007] Optionally, the switching component further includes a motor, the output of which is connected to the shaft of the support arm.

[0008] Optionally, the switching component further includes multiple first positioning components and second positioning components; Multiple first positioning components are connected to the bracket, and second positioning components are connected to the shaft. When the first positioning component approaches the second positioning component, the turntable can be positioned; The positions of the multiple first positioning components correspond to the multiple test tube positioning ports, respectively.

[0009] Optionally, the second positioning component is a magnetic block, and the first positioning component is a metal block that can be attracted by the magnetic block.

[0010] Optionally, the turntable is provided with multiple fixing components, the fixing components including a fixed base, a movable base, a slide rod, an outer cylinder, a spring, and a clamping component; The fixed seat is slidably connected to the slide rod, the slide rod is connected to the movable seat, the movable seat is connected to the clamping member, the clamping member passes through the outer cylinder, the outer cylinder corresponds to the position of the test tube positioning port, the spring is sleeved on the slide rod, the two ends of the spring are respectively connected to the fixed seat and the movable seat, and the outer cylinder is connected to the turntable.

[0011] Optionally, the side of the clamping member closest to the outer cylinder is arc-shaped, and a rubber pad is provided on the arc-shaped surface.

[0012] In summary, this application includes the following beneficial technical effects: This invention automates test tube switching using a switching assembly, eliminating the need for researchers to repeatedly handle and place delivery tubes. When a test tube needs to be switched, a motor drives the support arm to rotate, moving a turntable to remove the current test tube from the detection position. The turntable is then manually rotated to switch to the target test tube. After precise positioning by the first and second positioning components, the motor reverses to bring the target test tube into the detection position. The entire process is seamless and efficient, meeting the needs of rapid testing of large batches of samples and reducing the workload of researchers. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the front in an embodiment of this application; Figure 2 This is an exploded view of an embodiment of this application; Figure 3 This is a three-dimensional structural schematic diagram of the fixing component in the embodiments of this application; Figure 4 This is a three-dimensional structural diagram of the switching component in an embodiment of this application; Figure 5 This is a three-dimensional structural diagram of the switching component from another perspective in an embodiment of this application.

[0014] Figure label: 1. Main body; 2. Guide tube positioning part; 3. Guide tube fixing part; 4. Fixing component; 401. Outer cylinder; 402. Moving seat; 403. Slide rod; 404. Spring; 405. Fixing seat; 406. Clamping component; 5. Switching component; 501. Motor; 502. Support arm; 503. Turntable; 504. Test tube positioning port; 505. Bracket; 506. Shaft; 507. Second positioning component; 508. First positioning component. Detailed Implementation

[0015] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0016] This application discloses a sample introduction device for an inductively coupled plasma mass spectrometer.

[0017] Please see Figure 1 , Figure 2 , Figure 4 and Figure 5 This invention provides a sample introduction device for an inductively coupled plasma mass spectrometer, comprising a body 1, a catheter fixing part 3, and a catheter positioning part 2. The catheter fixing part 3 and the catheter positioning part 2 are disposed on the body 1, wherein the catheter fixing part 3 is used to fix the catheter, and the catheter positioning part 2 is used to position the monitoring position of the catheter.

[0018] The sample introduction device also includes a switching assembly 5. The switching assembly 5 includes a turntable 503, multiple test tube positioning ports 504 machined on the turntable 503, a shaft 506, a support 505, and a support arm 502. The test tube positioning ports 504 are used to position test tubes. The bottom of the turntable 503 is fixedly connected to the shaft 506. The shaft 506 is rotatably connected to the support 505 through rotating connecting parts such as bearings. The support 505 is fixedly connected to the support arm 502. The support arm 502 is rotatably connected to the main body 1 through a support base and a corresponding rotating shaft.

[0019] Furthermore, the switching component 5 also includes a motor 501. The output end of the motor 501 is connected to the rotating shaft of the support arm 502 through a coupling or other transmission components. By operating the motor 501, the support arm 502 can be driven to rotate around the rotating shaft connected to the main body 1, thereby driving the bracket 505, shaft 506 and turntable 503 to rotate, so that the test tube in the test tube positioning port 504 is separated from the monitoring end of the guide tube. When the drive motor 501 is reversed to the horizontal position, the monitoring position of the guide tube moves relative to the switched test tube for testing.

[0020] The switching component 5 also includes multiple first positioning components 508 and second positioning components 507. The multiple first positioning components 508 are connected to the bracket 505 by welding, bolts, or other fixing methods, while the second positioning components 507 are connected to the shaft 506 by key connections, interference fits, or other methods. When the first positioning components 508 and second positioning components 507 approach each other, they can position the turntable 503. Specifically, the positions of the multiple first positioning components 508 correspond to the multiple test tube positioning ports 504. When the turntable 503 rotates to the working position of a specific test tube positioning port 504, the corresponding first positioning component 508 will approach and interact with the second positioning component 507, thereby preventing the turntable 503 from continuing to rotate and achieving precise positioning of the turntable 503.

[0021] In this embodiment, the second positioning component 507 is a magnetic block, and the first positioning component 508 is a metal block that can be attracted by the magnetic block. When the turntable 503 rotates to the correct position, the magnetic block (second positioning component 507) and the corresponding metal block (first positioning component 508) attract each other, generating sufficient resistance to fix the position of the turntable 503 and ensure the stability of the test tube during sample injection. Of course, in other embodiments, the first positioning component 508 and the second positioning component 507 can also adopt other structures that can achieve the positioning function, such as a pin-type positioning structure. Multiple insertion holes corresponding to the positions of the test tube positioning ports 504 are provided on the support 505 as the first positioning component 508, and a retractable pin is provided on the shaft 506 as the second positioning component 507. When the turntable 503 rotates to the appropriate position, the pin extends and inserts into the corresponding insertion hole to achieve positioning.

[0022] Please combine Figure 3 The turntable 503 is also provided with a plurality of fixing components 4 for clamping and fixing the test tubes in the test tube positioning port 504 to prevent the test tubes from shaking or shifting during the rotation of the turntable 503 or the sample injection process.

[0023] Each fixing component 4 includes a fixed base 405, a movable base 402, a slide rod 403, an outer cylinder 401, a spring 404, and a clamping member 406. The fixed base 405 is fixed to the upper surface of the turntable 503 by bolts or welding. The fixed base 405 has a horizontally extending sliding hole, through which the slide rod 403 passes, forming a slidable connection with the fixed base 405, allowing it to move freely back and forth along the axial direction of the sliding hole. One end of the slide rod 403 is fixed to the movable base 402 by a threaded connection or integral molding. The side of the movable base 402 away from the slide rod 403 is detachably connected to the clamping member 406 by bolts or a snap-fit ​​structure, facilitating the replacement and maintenance of the clamping member 406.

[0024] The outer cylinder 401 is a cylindrical structure open at both ends, with its axis collinear with the axis of the test tube positioning port 504. The bottom of the outer cylinder 401 is fixed to the upper surface of the turntable 503 by welding or bolting. The position of the outer cylinder 401 corresponds one-to-one with the test tube positioning port 504. After the test tube is placed into the test tube positioning port 504, its upper part will penetrate into the outer cylinder 401. The end of the clamping member 406 away from the moving seat 402 passes through the notch in the side wall of the outer cylinder 401 and extends into the interior of the outer cylinder 401 to contact the outer wall of the test tube.

[0025] Spring 404 is sleeved on the portion of slide rod 403 located between fixed seat 405 and movable seat 402. One end of spring 404 abuts against the side wall of fixed seat 405, and the other end abuts against the side wall of movable seat 402. In its natural state, spring 404 is in a compressed state, and its elastic force pushes movable seat 402 towards the outer cylinder 401, thereby causing clamping member 406 to clamp the test tube. When it is necessary to insert or remove the test tube, movable seat 402 is pulled away from outer cylinder 401, spring 404 is further compressed, clamping member 406 exits from the outer cylinder 401, and movable seat 402 is released after the test tube is placed in place. The restoring elastic force of spring 404 will drive clamping member 406 to automatically clamp the test tube.

[0026] To improve the stability and adaptability of clamping the test tube, the side of the clamping member 406 near the center of the outer cylinder 401 (i.e., the side in contact with the test tube) is designed as an arc-shaped surface. The radius of curvature of this arc-shaped surface matches the curvature of the outer wall of common test tubes, which can increase the contact area with the test tube. At the same time, a rubber pad is glued to the arc-shaped surface. The rubber pad not only increases the friction with the outer wall of the test tube and prevents the test tube from slipping during clamping, but also avoids direct rigid contact between the clamping member 406 and the test tube, which could lead to test tube breakage, thus playing a buffering and protective role.

[0027] With the above structure, the fixing component 4 can adapt to test tubes of different diameters (within the elastic deformation range of spring 404), and is easy to operate. It can effectively ensure the positional stability of the test tube during the detection process and improve the sample injection accuracy.

[0028] The implementation principle of the inductively coupled plasma mass spectrometer sample introduction device in this application embodiment is as follows: When the device is running, the guide tube is first fixed by the guide tube fixing part 3, and the guide tube positioning part 2 positions the monitoring position of the guide tube to ensure that the monitoring end of the guide tube is in the preset working position, so as to prepare for subsequent detection.

[0029] The core function of the switching component 5 is to enable the switching of different test tubes to meet the needs of continuous testing. Initially, the support arm 502 is in a horizontal position, and a test tube in a positioning port 504 on the turntable 503 is in the detection position of the catheter monitoring end. When a test tube needs to be switched, the motor 501 is started. The output of the motor 501 drives the shaft of the support arm 502 to rotate through a coupling and other transmission components, causing the support arm 502 to rotate around the shaft connected to the main body 1. This, in turn, drives the support 505, shaft 506, and turntable 503 to rotate together, allowing the test tube currently in the detection position to disengage from the monitoring end of the catheter.

[0030] During the test tube switching process, the rotation of turntable 503 is achieved by the rotational connection between shaft 506 and support 505. When turntable 503 rotates to the position corresponding to the target test tube positioning port 504, the first positioning component 508 corresponding to the test tube positioning port 504 will approach the second positioning component 507. Since the second positioning component 507 is a magnetic block and the first positioning component 508 is a metal block that can be attracted by the magnetic block, the two attract each other to generate a positioning force, preventing turntable 503 from continuing to rotate, thereby achieving precise positioning of turntable 503 and ensuring that the target test tube is accurately in the position to be tested.

[0031] Then, the drive motor 501 reverses, causing the support arm 502 to rotate back to the horizontal position. At this time, the monitoring position of the guide tube moves to the switched test tube, and the sample in the test tube can be tested.

[0032] The fixing component 4 serves to secure the test tube throughout the process. When the test tube is placed into the test tube positioning port 504, the movable seat 402 is pulled away from the outer cylinder 401. The slide rod 403 slides within the sliding hole of the fixing seat 405, further compressing the spring 404. The clamping member 406 exits the outer cylinder 401, making room for the test tube to be placed. After the test tube is placed, its upper part passes into the outer cylinder 401. The movable seat 402 is released, and the spring 404, under the action of the restoring force, pushes the movable seat 402 towards the outer cylinder 401, causing the clamping member 406 to extend into the outer cylinder 401 and contact the outer wall of the test tube.

[0033] Because the side of the clamping component 406 that contacts the test tube is curved and has a rubber pad, it not only increases the contact area with the test tube and increases friction to prevent the test tube from slipping, but also avoids test tube breakage caused by rigid contact. Meanwhile, within the elastic deformation range of the spring 404, the fixing component 4 can adapt to test tubes of different diameters, ensuring that the test tube does not shake or shift during the rotation of the turntable 503 and the detection process. This ensures that the catheter monitoring end can stably and accurately detect the sample inside the test tube, effectively improving sample injection accuracy and detection reliability.

[0034] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sample introduction device for an inductively coupled plasma mass spectrometer, comprising a body (1), a catheter fixing part (3), and a catheter positioning part (2), wherein the catheter fixing part (3) and the catheter positioning part (2) are disposed on the body (1), the catheter fixing part (3) is used to fix the catheter, and the catheter positioning part (2) is used to locate the monitoring position of the catheter, characterized in that: It also includes a switching component (5), which includes a turntable (503), a plurality of test tube positioning ports (504) machined on the turntable (503), a shaft (506), a bracket (505) and a support arm (502); The test tube positioning port (504) is used to position the test tube. The bottom of the turntable (503) is connected to the shaft (506). The shaft (506) is rotatably connected to the bracket (505). The bracket (505) is connected to the support arm (502). The support arm (502) is rotatably connected to the main body (1) through the support seat.

2. The device according to claim 1, wherein: The switching component (5) also includes a motor (501), the output end of which is connected to the shaft of the support arm (502).

3. The device of claim 1, wherein: The switching component (5) also includes a plurality of first positioning components (508) and second positioning components (507); Multiple first positioning components (508) are connected to the bracket (505), and second positioning components (507) are connected to the shaft (506); When the first positioning component (508) approaches the second positioning component (507), the turntable (503) can be positioned. The positions of the plurality of first positioning components (508) correspond to the plurality of test tube positioning ports (504).

4. The device of claim 3, wherein: The second positioning component (507) is a magnetic block, and the first positioning component (508) is a metal block that can be attracted by the magnetic block.

5. The device of claim 1, wherein: The turntable (503) is provided with a plurality of fixing components (4), the fixing components (4) including a fixing seat (405), a moving seat (402), a slide bar (403), an outer cylinder (401), a spring (404) and a clamping member (406). The fixed seat (405) is slidably connected to the slide rod (403), the slide rod (403) is connected to the movable seat (402), the movable seat (402) is connected to the clamping member (406), the clamping member (406) passes through the outer cylinder (401), the outer cylinder (401) corresponds to the position of the test tube positioning port (504), the spring (404) is sleeved on the slide rod (403), the two ends of the spring (404) are respectively connected to the fixed seat (405) and the movable seat (402), and the outer cylinder (401) is connected to the turntable (503).

6. The device of claim 5, wherein: The clamping member (406) has an arc-shaped surface on the side near the outer cylinder (401), and a rubber pad is provided on the arc-shaped surface.

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