A high-precision protection structure and detection mass spectrometer

Abstract

The present invention discloses a high-precision protection structure and a detection mass spectrometer, which belong to the field of detection mass spectrometers. The structure comprises a lifting chamber, wherein a sampling needle is installed inside the lifting chamber, a pull rod is slidably installed on the top end of the sampling needle, a lifting plate is installed on the circumferential side of the pull rod, the top end of the lifting plate passes through the lifting chamber and is connected to a pneumatic power source, a needle tube is fixedly installed on the bottom end of the sampling needle, the bottom end of the needle tube passes through the lifting chamber and extends to the bottom of the lifting chamber, and a protection component is provided on the outer wall of the needle tube for preventing the needle tube from bending; through the provided protection component, the needle tube can be guided and limited when the sampling needle performs a sampling operation, so as to prevent the needle tube from bending easily when inserting into the sample bottle, thereby affecting the sampling amount of the sample for the sampling needle and affecting the detection result, and providing protection for the needle tube, thereby improving the accuracy of sampling, improving the sampling accuracy of the mass spectrometer, and thereby improving the accuracy of the sample detection result.

Description

Technical Field

[0001] The present invention relates to the technical field of detection mass spectrometers, and more particularly to a high-precision protection structure and a detection mass spectrometer. Background Art

[0002] In the field of modern scientific research and industrial testing, mass spectrometers, as high-end instruments that can accurately analyze the composition and structure of substances, are widely used in many key fields such as chemistry, biology, medicine, and environment due to their high sensitivity and high resolution. Among them, the sampling accuracy of the mass spectrometer directly determines the reliability of the analysis results. The sampling needle is the core component connecting the sample and the instrument analysis system, and its working stability is crucial.

[0003] In the prior art, during the long-term use of the sampling system of the mass spectrometer, since the needle tube of the sampling needle is usually a slender structure, during the process of repeatedly inserting and pulling out the sample bottle, the needle tip contacts the top of the sample bottle, and is easily slightly deformed by the force of the sample bottle, and the internal liquid flow path thereof is changed, so that the bottom end of the needle tube is slightly higher than the set height, and the actual injection volume is less than the set value, thereby weakening the mass spectrometry detection signal, and the measured substance concentration deviates from the true value, which easily leads to inaccurate injection volume. In addition, some liquid may be retained at the bend, resulting in the possibility of differences in the residual amount of liquid and the flow resistance during each injection of the bent needle during injection, thereby causing the repeatability of the injection volume to deteriorate. When the same reagent is repeatedly tested, the test results obtained fluctuate greatly, and the number of samples is not good. The precision of the data is reduced, further affecting the accurate judgment of the reagent composition and content. In addition, changes in the injection volume and sample state will also affect the ionization efficiency of the reagent in the ion source, resulting in a decrease in the number of ions or a change in the type distribution, seriously reducing the sensitivity and accuracy of the detection. In more serious cases, when the needle breaks, it is difficult for the sampling device to collect samples, resulting in an empty needle phenomenon in the mass spectrometer, and a test time usually takes twenty to forty minutes. The staff will only perform maintenance inspections when they see abnormal test results, which wastes a lot of time and seriously affects work efficiency. Moreover, the mass spectrometer usually processes a large number of samples at a time. If the staff does not check the test results in time, when the needle is severely bent or broken, it will cause the mass spectrometer to work ineffectively for a long time.

[0004] Therefore, in order to solve the above problems, we proposed a high-precision protection structure and detection mass spectrometer. Summary of the Invention

[0005] In order to solve the problems raised in the background technology, the present invention provides the following technical solutions:

[0006] A high-precision protection structure includes a lifting chamber, a sampling needle is installed inside the lifting chamber, a pull rod is slidably installed on the top of the sampling needle, a lifting plate is installed on the circumference of the pull rod, the top of the lifting plate passes through the lifting chamber and is connected to a pneumatic power source, a needle tube is fixedly installed on the bottom end of the sampling needle, the bottom end of the needle tube passes through the lifting chamber and extends to the bottom of the lifting chamber, and the outer wall of the needle tube is provided with a protection component for preventing the needle tube from bending or breaking;

[0007] The protection assembly includes a middle protection block slidably mounted on the outer wall of the needle tube, a top protection block is arranged above the middle protection block, the middle protection block and the top protection block are connected by a reset spring, and the top protection block is installed on the outer wall of the needle tube through a fixing assembly, the first connecting rod is rotatably mounted on both sides of the middle protection block, the second connecting rod is rotatably mounted on the other end of the first connecting rod, a positioning assembly for preventing the sample bottle from shifting is provided on one side of the second connecting rod, the top of the second connecting rod is slidably mounted on a rotating seat, a connecting assembly for conveniently connecting the second connecting rod and the rotating seat is provided between the second connecting rod and the rotating seat, the top of the rotating seat is rotatably mounted on the inner wall of the lifting chamber, and the bottom end of the second connecting rod is fixedly mounted with a bottom protection block.

[0008] Preferably, the connecting assembly includes an arc-shaped chuck fixedly mounted on the top end of the second connecting rod, the arc-shaped chuck and the second connecting rod are fixedly connected by a round rod, the bottom end of the arc-shaped chuck is abutted with a clamping block, the clamping block is slidably mounted on the inner wall of the rotating seat, a connecting rod is fixedly mounted on the side of the clamping block away from the arc-shaped chuck, an abutting spring is sleeved on the outer wall of the connecting rod, one end of the connecting rod passes through the rotating seat and extends to one side of the rotating seat, and a handle is fixedly mounted on the end of the connecting rod extending to one side of the rotating seat.

[0009] Preferably, the top of the arc chuck is set to be an arc shape, the bottom of the arc chuck is set to be straight, the top of the clamping block close to the arc chuck is set to be flat, and the bottom of the clamping block close to the arc chuck is set to be an inclined portion.

[0010] Preferably, the fixing assembly includes a fixing sleeve fixedly mounted on the inner wall of the middle protection block, a threaded sleeve is threadedly mounted on the inner wall of the fixing sleeve, a turning handle is fixedly mounted on the top end of the threaded sleeve, an inclined round block is fixedly mounted on the bottom end of the threaded sleeve, the bottom end of the inclined round block is abutted against a fixing part, and the bottom end of the fixing part is fixedly mounted on the inner wall of the middle protection block.

[0011] Preferably, the bottom end of the fixing member is set to a frustum with a cross-sectional radius increasing from bottom to top, the top end of the fixing member is set to a frustum with a cross-sectional radius decreasing from bottom to top, and the part where the inclined round block abuts against the top end of the fixing member is set to an inclined shape that matches the top end of the fixing member.

[0012] Preferably, a semicircular slot is provided on one side of the bottom protection block that abuts the needle tube, the diameter of the circular slot formed by the semicircular slot is larger than the diameter of the cross section of the needle tube, and an abutment plate is provided on the outside of the needle tube, and the horizontal position of the abutment plate is set below the midpoint of the needle tube.

[0013] Preferably, the positioning assembly includes a connecting block arranged on one side of the second connecting rod, and the bottom end of the connecting block is fixedly mounted with a first positioning block.

[0014] Preferably, a second positioning block is slidably mounted on the inner side of each of the first positioning blocks, and each of the second positioning blocks is slidably mounted on the inner side of the C-shaped groove. The second positioning block and the first positioning block are connected via a buffer spring.

[0015] A detection mass spectrometer includes a high-precision protection structure and a mass spectrometer body, wherein a vacuum system and an injection system are provided inside the mass spectrometer body, wherein the vacuum system includes a vacuum chamber and a molecular pump provided inside the mass spectrometer body, and the injection system includes an injection tray provided on one side of the mass spectrometer body, wherein a rotating sample disk is rotatably mounted on the top of the injection tray, and sample slots are evenly arranged on the top of the rotating sample disk, wherein the cross-sectional diameter of the sample slots is larger than the cross-sectional diameter of the sample bottle, and an injection base is slidably mounted on the top of the rotating sample disk, and a lifting chamber is provided at one end of the injection base, and the lifting chamber is slidably mounted on one end of the injection base through a lifting assembly.

[0016] In summary, the present invention has the following beneficial effects:

[0017] By setting up the protection component, the needle tube can be guided and limited when the sampling needle is performing the injection operation, so as to prevent the needle tube from bending easily when inserting the sample bottle, thereby affecting the sampling amount of the sample for the sampling target, affecting the test results, and easily causing damage to the ion source. It provides protection for the sampling of the needle tube, thereby improving the accuracy of sampling, improving the sampling accuracy of the mass spectrometer, and thus improving the accuracy of the sample test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of the overall structure of the mass spectrometer for detection of the present invention;

[0020] Figure 2 Schematic diagram of the cross-sectional structure of the sample injection system of the present invention;

[0021] Figure 3 Schematic diagram of the cross-sectional structure of the protection component of the present invention;

[0022] Figure 4 For the present invention Figure 3 Enlarged view of point A in the middle;

[0023] Figure 5 This is a schematic cross-sectional view of the positioning assembly of the present invention;

[0024] Figure 6 For the present invention Figure 5 Enlarged view of point B in the middle;

[0025] Figure 7 For the present invention Figure 5 Enlarged view of point C in the middle;

[0026] Figure 8 It is a schematic cross-sectional structure diagram of the fixing component of the present invention;

[0027] Figure 9 For the present invention Figure 8 Enlarged view of point D in the middle.

[0028] In the picture:

[0029] 1. Lifting chamber; 2. Sampling needle; 3. Pull rod; 4. Lifting plate; 5. Pneumatic power source; 6. Needle tube; 7. Middle protection block; 8. First connecting rod; 9. Second connecting rod; 10. Rotating seat; 11. Bottom protection block; 12. Arc chuck; 13. Clamping block; 14. Connecting rod; 15. Abutment spring; 16. Handle; 17. Fixed sleeve; 18. Threaded sleeve; 19. Turning handle; 20. Inclined round block; 21. Fixing part; 22. Connecting block; 23. First positioning block; 24. Second positioning block; 25. Buffer spring; 26. Mass spectrometer body; 27. Injection tray; 28. Rotating sample tray; 29. ​​Injection base; 30. Reset spring; 31. Top protection block; 32. Abutment plate; 33. Round rod. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Example 1

[0032] The following is combined with Figure 1-9 The present invention is described in further detail.

[0033] See also Figure 1-9 The present invention provides a technical solution: a high-precision protection structure and a detection mass spectrometer, such as Figure 1-4 As shown, a detection mass spectrometer includes a high-precision protection structure and a mass spectrometer body 26, the interior of the mass spectrometer body 26 is provided with a vacuum system and an injection system, the vacuum system includes a vacuum chamber and a molecular pump arranged inside the mass spectrometer body 26, the injection system includes an injection tray 27 arranged on one side of the mass spectrometer body 26, the top of the injection tray 27 is rotatably mounted with a rotating sample disk 28, the top of the rotating sample disk 28 is evenly provided with sample slots, the cross-sectional diameter of the sample slots is larger than the cross-sectional diameter of the sample bottles, which is convenient for placing the sample bottles, the top of the rotating sample disk 28 is slidably mounted with an injection base 29, one end of the injection base 29 is provided with a lifting chamber 1, the lifting chamber 1 is slidably mounted on one end of the injection base 29 through a lifting assembly (not shown in the figure), the lifting assembly is composed of a motor, a screw rod and a slider, wherein the motor and the screw rod are both mounted on one side of the injection base 29, the slider is fixedly mounted on one side of the lifting chamber 1, and the motor is connected to an external power supply through a wire;

[0034] like Figure 3-5 As shown, a high-precision protection structure includes a lifting chamber 1, a sampling needle 2 is installed inside the lifting chamber 1, a pull rod 3 is slidably installed on the top end of the sampling needle 2, and a lifting plate 4 is installed on the circumferential side of the pull rod 3. A fixing frame is also provided inside the lifting chamber 1, and the sampling needle 2 is fixed in the lifting chamber 1 by clamping the sampling needle 2 into the fixing frame and then clamping the pull rod 3 into the lifting plate 4. The top end of the lifting plate 4 passes through the lifting chamber 1 and is connected to a pneumatic power source 5, wherein the pneumatic power source 5 can be an air pump. Because it belongs to a mature existing technology, its working principle and internal structure are not described in detail. A needle tube 6 is fixedly installed on the bottom end of the sampling needle 2, and the bottom end of the needle tube 6 passes through the lifting chamber 1 and extends to the bottom of the lifting chamber 1. The outer wall of the needle tube 6 is provided with a protective component for preventing the needle tube 6 from bending or breaking;

[0035] The protection assembly includes a middle protection block 7 slidably mounted on the outer wall of the needle tube 6, a top protection block 31 is provided above the middle protection block 7, the middle protection block 7 and the top protection block 31 are connected by a return spring 30, the top protection block 31 is installed on the outer wall of the needle tube 6 through a fixing assembly, both sides of the middle protection block 7 are rotatably mounted with a first connecting rod 8, the other end of the first connecting rod 8 is rotatably mounted with a second connecting rod 9, one side of the second connecting rod 9 is provided with a positioning assembly for preventing the sample bottle from shifting, and the top of the second connecting rod 9 is slidably mounted with a The rotating seat 10 is provided with a connecting assembly for conveniently connecting the second connecting rod 9 and the rotating seat 10. The top of the rotating seat 10 is rotatably mounted on the inner wall of the lifting chamber 1, and the bottom end of the second connecting rod 9 is fixedly mounted with a bottom protection block 11, wherein the bottom protection block 11 is provided with a semicircular slot on one side abutting against the needle tube 6. The diameter of the circular slot formed by the semicircular slot is larger than the diameter of the cross section of the needle tube 6, which can protect the needle tube 6 while allowing the needle tube 6 to move through the bottom protection block 11;

[0036] In addition, the bottom end of the middle protection block 7 is abutted against an abutment plate 32, and the abutment plate 32 is snap-fitted and installed on one side of the sampling base 29, so that when the sampling system is sampling, the middle protection block 7 is driven to move by the needle tube 6, so that the middle protection block 7 abuts against the abutment plate 32. Under the limit of the abutment plate 32, the middle protection block 7 moves upward relative to the needle tube 6, thereby driving the bottom protection block 11 to abut against both sides of the needle tube 6 through the first connecting rod 8, the second connecting rod 9 and the rotating seat 10, thereby guiding and limiting the needle tube 6 so that the needle tube 6 can be vertically inserted into the sample bottle. In addition, when the lifting assembly drives the needle tube 6 to move out of the sample bottle, the abutment plate 32 stops limiting the middle protection block 7. At this time, the middle protection block 7 is relative to the needle tube under the elastic action of the reset spring 30. 6 moves downward, thereby driving the bottom protection block 11 to move away from the needle tube 6 through the middle protection block 7, the second connecting rod 9, the second connecting rod 9 and the rotating seat 10, thereby avoiding the bottom protection block 11 from contacting the bottom end portion of the needle tube 6. Since the bottom end of the needle tube 6 pulled out of the sample bottle is prone to be attached to the sample, the bottom protection block 11 is in contact with the bottom end portion of the needle tube 6 at this time, which easily causes the sample to remain on the inside of the bottom protection block 11, resulting in the bottom protection block 11 protecting the needle tube 6 next time, causing the residual sample liquid to adhere to the outer wall of the needle tube 6, thereby contaminating the sampling result, affecting the accuracy of the mass spectrometer detection result, reducing the interference and error during mass spectrometer sampling, and further improving the accuracy and reliability of the mass spectrometer detection result.

[0037] In this embodiment, by providing a protective component, the needle tube 6 can be protected when the injection system is sampling, thereby preventing the guide rails of the lifting chamber 1 from mechanical wear and tear during long-term, high-frequency operation of the mass spectrometer, or the needle tube 6 from slight deformation due to repeated stress. These factors may cause the needle tube 6 to deviate when inserted into the sample bottle. Once the deviation occurs, the needle tube 6 is very likely to bend when it contacts the mouth or inner wall of the sample bottle. This bending directly causes the sampling volume to deviate from the preset value, making the reagent injection volume less than the set value, resulting in a weakened mass spectrometry detection signal and a measured substance concentration less than the reagent concentration, thereby affecting the accuracy of the mass spectrometer detection results.

[0038] In addition, changes in the injection volume and sample state will also affect the ionization efficiency of the reagent in the ion source. When the injection volume is insufficient, it is easy to reduce the number of ions generated in the ion source or change the distribution of ion species, thereby reducing the detection sensitivity and accuracy. In more serious cases, when the needle tube 6 breaks, it is difficult for the sampling needle 2 to collect samples, resulting in an empty needle phenomenon in the mass spectrometer, and a detection time usually takes twenty to forty minutes. The staff will only perform maintenance and inspections when they see abnormal test results, which wastes a lot of time and seriously affects work efficiency. After adopting the protection component in this embodiment, the movement trajectory of the needle tube 6 can be guided and limited, thereby reducing the risk of bending of the needle tube 6, improving the accuracy of mass spectrometer sampling, thereby improving the accuracy and reliability of the mass spectrometer detection results, and also ensuring the stable ionization efficiency of the sample in the ion source, providing a solid guarantee for the accuracy and reliability of the detection results.

[0039] like Figure 5 and Figure 6 As shown, the connecting assembly includes an arc-shaped chuck 12 fixedly mounted on the top of the second connecting rod 9, and the arc-shaped chuck 12 and the second connecting rod 9 are fixedly connected by a round rod 33, and the bottom end of the arc-shaped chuck 12 is abutted with a clamping block 13, and the clamping block 13 is slidably mounted on the inner wall of the rotating seat 10, and the side of the clamping block 13 away from the arc-shaped chuck 12 is fixedly mounted with a connecting rod 14, and the outer wall of the connecting rod 14 is sleeved with an abutting spring 15, one end of the connecting rod 14 passes through the rotating seat 10 and extends to one side of the rotating seat 10, and the end of the connecting rod 14 extending to one side of the rotating seat 10 is fixedly mounted with a handle 16, wherein it needs to be supplemented that the top of the arc-shaped chuck 12 is set to a circular arc shape, the bottom end of the arc-shaped chuck 12 is set to a straight shape, the top end of the clamping block 13 close to the arc-shaped chuck 12 is set to a flat part, and the bottom end of the clamping block 13 close to the arc-shaped chuck 12 is set to an inclined part;

[0040] With this design, when the second connecting rod 9 and the rotating seat 10 are connected, the second connecting rod 9 can be pushed, so that the second connecting rod 9 drives the arc chuck 12 to move in the direction close to the rotating seat 10. At this time, the arc-shaped top of the arc chuck 12 abuts against the inclined part of the clamping block 13, so that the top of the arc chuck 12 pushes the clamping block 13 to move in the direction away from the arc chuck 12. At the same time, the clamping block 13 squeezes the abutting spring 15, causing the abutting spring 15 to undergo elastic deformation, accumulating elastic potential energy. When the arc chuck 12 moves to When the clamping block 13 reaches the top, the abutment spring 15 releases its elastic potential energy, causing elastic deformation to push the clamping block 13 to move, so that the straight portion of the clamping block 13 abuts against the bottom end of the arc-shaped chuck 12. At this time, the top end of the second connecting rod 9 abuts against the bottom end of the rotating seat 10, so that the arc-shaped chuck 12 cannot move, completing the tight connection between the second connecting rod 9 and the rotating seat 10, so that the second connecting rod 9 can rotate around the axis of the top end of the rotating seat 10, thereby driving the bottom protection block 11 to move to both sides of the needle tube 6 to protect the needle tube 6;

[0041] In addition, when it is necessary to release the connection between the second connecting rod 9 and the rotating seat 10, the staff can pull the handle 16 so that the handle 16 drives the block 13 to move away from the arc chuck 12 through the abutment spring 15. When the block 13 is moved away from the bottom end of the arc chuck 12, the staff can easily move the second connecting rod 9 away from the bottom end of the rotating seat 10.

[0042] Further, such as Figure 8 and Figure 9 As shown, the fixing assembly includes a fixing sleeve 17 fixedly mounted on the inner wall of the top protection block 31, a threaded sleeve 18 is threadedly mounted on the inner wall of the fixing sleeve 17, a turning handle 19 is fixedly mounted on the top of the threaded sleeve 18, an inclined round block 20 is fixedly mounted on the bottom end of the threaded sleeve 18, and the bottom end of the inclined round block 20 abuts against a fixing member 21, and the bottom end of the fixing member 21 is fixedly mounted on the inner wall of the middle protection block 7, wherein the bottom end of the fixing member 21 is set to be a truncated cone with a cross-sectional radius increasing from bottom to top, and the top of the fixing member 21 is fixed to the inner wall of the middle protection block 7. The end is set to be a truncated cone with a cross-sectional radius decreasing from bottom to top, and the portion where the inclined round block 20 abuts against the top of the fixing member 21 is set to be inclined to match the top of the fixing member 21. With this design, when installing the protection assembly, the top protection block 31 can be sleeved on the outer wall of the needle tube 6 and moved to a suitable position. At this time, the staff can rotate the handle 19 so that the handle 19 drives the fixing member 21 to squeeze the needle tube 6 through the threaded sleeve 18 and the inclined round block 20, thereby fixing the middle protection block 7 to the outer wall of the needle tube 6;

[0043] It is worth noting that the horizontal position of the abutment plate 32 is set below the midpoint of the needle tube 6, that is, when the bottom protection block 11 is closed, the middle protection block 7 can be at the midpoint of the needle tube 6. Such a design can enable the middle protection block 7 to cooperate with the top protection block 31 and the bottom protection block 11 to support the top, middle and bottom ends of the needle tube 6, thereby enhancing the overall strength of the needle tube 6. When the needle tube 6 is inserted into the sample bottle, the stress at its midpoint is the greatest. By setting the middle protection block 7 at the midpoint of the needle tube 6, the middle protection block 7 can share most of the stress, reducing the possibility of bending and deformation of the middle part of the needle tube 6, and further improving the protection effect of the protection device on the needle tube 6, thereby improving the sampling accuracy of the mass spectrometer, reducing detection errors, and thereby improving the accuracy of the mass spectrometer detection results.

[0044] In this embodiment, by providing a connecting component and a fixing component, a quick connection and locking between the protective component, the rotating seat 10 and the needle tube 6 is achieved when the protective component is installed, thereby improving the stability and operational convenience of the connection between the protective component and the needle tube 6. When the handle 19 is rotated, the threaded sleeve 18 drives the inclined round block 20 to move downward, and the squeezing effect of the inclined surface is utilized to make the fixing member 21 fit closely to the outer wall of the needle tube 6, which can ensure the firmness of the connection and avoid damage to the needle tube 6 due to excessive squeezing. The invention is suitable for the installation requirements of needle tubes 6 with different diameters and provides a convenient and reliable operation. The applicability of the protection component is improved. At the same time, through the three-point support structure formed by the middle protection block 7, the top protection block 31 and the bottom protection block 11, a complete mechanical support system is constructed from the top, middle to bottom of the needle tube 6, which effectively disperses the external force applied to the needle tube 6 during movement, significantly enhances the overall strength of the needle tube 6, reduces the risk of bending, and effectively avoids the problem that the middle part of the needle tube 6 is easily bent and deformed due to stress concentration, thereby improving the overall strength of the needle tube 6 and the sampling accuracy of the mass spectrometer, reducing the detection error, and thus improving the accuracy of the mass spectrometer detection results.

[0045] Example 2

[0046] like Figure 5 and Figure 7 As shown, the positioning assembly includes a connecting block 22 provided on one side of the second connecting rod 9, and a first positioning block 23 is fixedly installed on the bottom end of the connecting block 22, wherein a second positioning block 24 is slidably installed on the inner side of the first positioning block 23. In order to facilitate the placement of the sample bottle, the cross-sectional diameter of the sample groove provided on the top of the rotating sample disk 28 is larger than the cross-sectional diameter of the sample bottle, which causes the sample bottle to be easily offset when being sampled, causing the problem of bending of the bottom end of the needle tube 6. By providing the connecting block 22 and the first positioning block 23, the sample bottle can be positioned when the needle tube 6 is sampling the sample bottle;

[0047] And as Figure 7As can be seen, a guide groove is provided on the inner side of the first positioning block 23, and guide blocks are provided on both sides of the second positioning block 24, so that the second positioning block 24 can move smoothly inside the C-shaped groove of the first positioning block 23 and prevent the second positioning block 24 from sliding out of the inner side of the first positioning block 23. The second positioning blocks 24 are slidably installed on the inner side of the C-shaped groove, and the second positioning blocks 24 and the first positioning blocks 23 are connected by buffer springs 25. Such a design can enable the second positioning block 24 to move toward the first positioning block 23 when positioning a sample bottle with a larger diameter through the design of the second positioning block 24 and the buffer spring 25, thereby preventing the second positioning block 24 from squeezing the sample bottle from both sides, causing the sample bottle to be damaged, thereby improving the applicability and stability of the device.

[0048] In this embodiment, by setting a positioning component, the sample bottle can be positioned when the needle tube 6 is sampling the sample bottle, so as to avoid the situation where the bottom end of the needle tube 6 is slightly offset due to the lifting chamber 1 or its own reasons, the needle tube 6 is difficult to enter vertically when inserted into the sample bottle. The inclined bottom end of the needle tube 6 can easily cause the sample bottle to deflect, causing the top end of the sample bottle to tilt, which can easily increase the bending degree of the bottom end of the needle tube 6, thereby affecting the accuracy of the amount collected by the sampling needle 2, resulting in the accuracy of the mass spectrometer detection results being affected. The stability of the sample bottle when being sampled is improved, while further improving the protection effect of the needle tube 6, it can also avoid sampling deviation caused by displacement of the sample bottle, ensuring that the needle tube 6 samples at the same position each time, ensuring the stability of the sampling amount, and reducing the fluctuation of the detection results caused by the difference in sampling amount, thereby improving the repeatability and accuracy of the mass spectrometer detection.

[0049] Working principle: Before performing the sample loading operation of the mass spectrometer, the staff opens the lifting chamber 1, inserts the cleaned sampling needle 2 into the fixed frame in the lifting chamber 1, and at the same time, snaps the pull rod 3 into the lifting plate 4, closes the lifting chamber 1, and completes the installation and fixation of the sampling needle 2. At this time, the staff sleeves the middle protection block 7 on the outer wall of the needle tube 6, and places the second connecting rod 9 on the bottom end of the rotating seat 10. At this time, the second connecting rod 9 is pushed in the direction close to the rotating seat 10, so that the second connecting rod 9 drives the arc chuck 12 to move, so that the top end of the arc chuck 12 abuts against the bottom end of the block 13. At this time, the arc chuck 12 is able to drive the block 13 to move in the direction away from the arc chuck 12 through the inclined design of the top end of the arc chuck 12 and the bottom end of the block 13. At this time, the block 13 squeezes the abutment spring 15, causing the abutment spring 15 to undergo elastic deformation, accumulating elastic potential energy. When the arc chuck 12 moves to the top of the block 13 When the needle tube 6 is in the middle of the protective block 7, the staff member rotates the handle 19, so that the handle 19 drives the threaded sleeve 18 to rotate, and the threaded sleeve 18 rotates and moves downward along the thread of the inner wall of the fixed sleeve 17, and the threaded sleeve 18 drives the inclined round block 20 to move, so that the inclined round block 20 drives the top of the fixing part 21 to move in the direction close to the needle tube 6, so that the inner side of the fixing part 21 tightly abuts against the outer wall of the needle tube 6, thereby fixing the middle protective block 7 to the outer wall of the needle tube 6, and then fixing the abutment plate 32 to one side of the injection base 29 to complete the installation of the protection assembly;

[0050] When it is necessary to perform sampling and testing on the sample, the motor is started, so that the motor drives the screw to rotate, the screw drives the slider to move, and the slider drives the lifting chamber 1 to move, so that the lifting chamber 1 drives the needle tube 6 to be inserted into the sample bottle, and at the same time the needle tube 6 drives the top protection block 31 to move, and the top protection block 31 squeezes the reset spring 30, so that the reset spring 30 drives the middle protection block 7 to move, and the middle protection block 7 abuts against the abutment plate 32. The abutment plate 32 limits the middle protection block 7, so that the middle protection block 7 moves upward relative to the needle tube 6, and the middle protection block 7 drives one end of the first connecting rod 8 to move, so that the first connecting rod 8 rotates in the direction close to the needle tube 6, the first connecting rod 8 drives the second connecting rod 9 to rotate, and the second connecting rod 9 drives the bottom protection block 11 rotates, so that the bottom protection block 11 abuts against both sides of the needle tube 6, guides and limits the needle tube 6, and prevents the bottom end of the needle tube 6 from bending and deforming. At the same time, the second connecting rod 9 drives the connecting block 22 to rotate, and the connecting block 22 drives the first positioning block 23 to rotate, and the first positioning block 23 drives the second positioning block 24 to rotate, so that the second positioning block 24 abuts against both sides of the sample bottle. At this time, the second positioning block 24 squeezes the buffer spring 25, so that the buffer spring 25 is elastically deformed, accumulating elastic potential energy, so that the second positioning block 24 positions the sample bottle. At this time, the pneumatic power source 5 is started, so that the pneumatic power source 5 drives the lifting plate 4 to move, so that the lifting plate 4 drives the pull rod 3 to move, so that the sampling needle 2 completes the sample extraction;

[0051] After completing the sampling of the sample bottle, the motor runs in the reverse direction, driving the lifting chamber 1 to rise through the screw rod and the slider, the lifting chamber 1 drives the needle tube 6 to move, and the needle tube 6 drives the top protection block 31 to move, so that the top protection block 31 stops squeezing the reset spring 30. At this time, the reset spring 30 releases its elastic potential energy, elastically deforms, and drives the middle protection block 7 to move, so that the middle protection block 7 moves downward relative to the needle tube 6. The middle protection block 7 drives the first connecting rod 8 to rotate in the direction away from the needle tube 6. The first connecting rod 8 drives the second connecting rod 9 to rotate, and the second connecting rod 9 drives the bottom protection block 11 to rotate, so that the bottom protection block 11 stops abutting against both sides of the needle tube 6 to prevent the bottom protection block 11 from touching the sample attached to the bottom end of the needle tube 6. At this time, the sampling base 29 drives the lifting chamber 1 to send the obtained sample into the lifting chamber 1 for detection;

[0052] After completing the loading of a sample, the injection base 29 drives the lifting chamber 1 to reset. At this time, the rotary sample disk 28 rotates and moves the cleaning bottle to the bottom end of the needle tube 6, so that the mass spectrometer repeats the above operation to clean the needle tube 6 and continue the sample loading operation.

[0053] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0054] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, and these changes and improvements shall fall within the scope of the invention claimed for protection.

Claims

1. A high-precision protection structure, comprising a lifting chamber (1), wherein a sampling needle (2) is installed inside the lifting chamber (1), a pull rod (3) is slidably installed on the top end of the sampling needle (2), a lifting plate (4) is installed on the peripheral side of the pull rod (3), the top end of the lifting plate (4) passes through the lifting chamber (1) and is connected to a pneumatic power source (5), a needle tube (6) is fixedly installed at the bottom end of the sampling needle (2), and the bottom end of the needle tube (6) passes through the lifting chamber (1) and extends to the bottom of the lifting chamber (1), characterized in that: The outer wall of the needle tube (6) is provided with a protective component for preventing the needle tube (6) from bending or breaking; The protection assembly includes a middle protection block (7) slidably mounted on the outer wall of the needle tube (6), a top protection block (31) is arranged above the middle protection block (7), the middle protection block (7) and the top protection block (31) are connected by a return spring (30), the top protection block (31) is mounted on the outer wall of the needle tube (6) through a fixing assembly, a first connecting rod (8) is rotatably mounted on both sides of the middle protection block (7), a second connecting rod (9) is rotatably mounted on the other end of the first connecting rod (8), a positioning assembly for preventing the sample bottle from shifting is arranged on one side of the second connecting rod (9), a rotating seat (10) is slidably mounted on the top of the second connecting rod (9), a connecting assembly for conveniently connecting the second connecting rod (9) and the rotating seat (10) is arranged between the second connecting rod (9) and the rotating seat (10), and a bottom protection block (11) is fixedly mounted on the bottom end of the second connecting rod (9).

2. A high-precision protection structure according to claim 1, characterized in that: The connecting assembly includes an arc chuck (12) fixedly mounted on the top of the second connecting rod (9), the arc chuck (12) and the second connecting rod (9) are fixedly connected via a round rod (33), the bottom end of the arc chuck (12) is abutted against a clamping block (13), the clamping block (13) is slidably mounted on the inner wall of the rotating seat (10), a connecting rod (14) is fixedly mounted on the side of the clamping block (13) away from the arc chuck (12), an abutting spring (15) is sleeved on the outer wall of the connecting rod (14), one end of the connecting rod (14) passes through the rotating seat (10) and extends to one side of the rotating seat (10), and a handle (16) is fixedly mounted on the end of the connecting rod (14) extending to one side of the rotating seat (10).

3. A high-precision protection structure according to claim 2, characterized in that: The top of the arc chuck (12) is configured as an arc shape, the bottom of the arc chuck (12) is configured as a straight shape, the top of the clamping block (13) close to the arc chuck (12) is configured as a flat portion, and the bottom of the clamping block (13) close to the arc chuck (12) is configured as an inclined portion.

4. A high-precision protection structure according to claim 1, characterized in that: The fixing assembly comprises a fixing sleeve (17) fixedly mounted on the inner wall of the middle protection block (7); a threaded sleeve (18) is threadedly mounted on the inner wall of the fixing sleeve (17); a turning handle (19) is fixedly mounted on the top end of the threaded sleeve (18); an inclined circular block (20) is fixedly mounted on the bottom end of the threaded sleeve (18); the bottom end of the inclined circular block (20) abuts against a fixing member (21); and the bottom end of the fixing member (21) is fixedly mounted on the inner wall of the middle protection block (7).

5. A high-precision protection structure according to claim 4, characterized in that: The bottom end of the fixing member (21) is configured to be a truncated cone with a cross-sectional radius increasing from bottom to top, the top end of the fixing member (21) is configured to be a truncated cone with a cross-sectional radius decreasing from bottom to top, and the portion where the inclined round block (20) abuts against the top end of the fixing member (21) is configured to be inclined in a manner consistent with the top end of the fixing member (21).

6. The high-precision protection structure according to claim 1, characterized in that: A semicircular slot is provided on one side of the bottom protection block (11) abutting against the needle tube (6). The diameter of the circular slot formed by the semicircular slot is larger than the diameter of the cross section of the needle tube (6). An abutment plate (32) is provided on the outer side of the needle tube (6). The horizontal position of the abutment plate (32) is set below the midpoint of the needle tube (6).

7. The high-precision protection structure according to claim 1, characterized in that: The positioning assembly comprises a connecting block (22) arranged on one side of the second connecting rod (9), and a first positioning block (23) is fixedly mounted on the bottom end of each connecting block (22).

8. The high-precision protection structure according to claim 7, characterized in that: A second positioning block (24) is slidably mounted on the inner side of each of the first positioning blocks (23). Each of the second positioning blocks (24) is slidably mounted on the inner side of the C-shaped groove. The second positioning block (24) and the first positioning block (23) are connected via a buffer spring (25).

9. A detection mass spectrometer, comprising a high-precision protection structure and a mass spectrometer body (26) according to any one of claims 1 to 8, characterized in that: The mass spectrometer body (26) is provided with a vacuum system and an injection system, wherein the vacuum system includes a vacuum chamber and a molecular pump provided inside the mass spectrometer body (26), and the injection system includes an injection tray (27) provided on one side of the mass spectrometer body (26), and a rotating sample disk (28) is rotatably installed on the top of the injection tray (27), and sample slots are evenly provided on the top of the rotating sample disk (28), and the cross-sectional diameter of the sample slots is larger than the cross-sectional diameter of the sample bottle, and an injection base (29) is slidably installed on the top of the rotating sample disk (28), and a lifting chamber (1) is provided at one end of the injection base (29), and the lifting chamber (1) is slidably installed on one end of the injection base (29) through a lifting assembly.

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