A sample introduction device for an inductively coupled plasma mass spectrometer

Abstract

The application relates to the technical field of mass spectrometer sampling, in particular to a sampling device of an inductively coupled plasma mass spectrometer, which comprises a bottom plate, and a top of the bottom plate is fixedly provided with an inductively coupled plasma mass spectrometer body. During application, the sampling mechanism adopts a first motor to drive a rotating disc to carry samples while amplifying power through a size belt wheel transmission, drives a spiral driving blade to rotate through a non-contact magnetic coupling to generate negative pressure, realizes automatic extraction of the samples, controls opening and closing of a plugging plate through the negative pressure, accurately controls a sample conveying channel, automatically seals after sampling, prevents sample residue and pollution, the design converts the carrying power into pumping power, simplifies the equipment structure, reduces the number of components and energy consumption, reduces the equipment operation and maintenance cost, and an automatic continuous sampling process replaces traditional single-tube extraction, greatly shortens the sampling time, and improves the sample processing efficiency.

Description

Technical Field

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

[0002] Mass spectrometers, as core instruments based on the principle of electromagnetic deflection of charged particles, separate and detect the mass differences of atoms, molecules, or fragment ions in matter. They play a crucial role in fields such as isotope analysis, inorganic element determination, and organic compound structure identification. According to their application scope, they can be subdivided into isotope mass spectrometers, inorganic mass spectrometers, and organic mass spectrometers; according to their performance parameters, they cover high, medium, and low resolution mass spectrometers; and according to their working principle, they are divided into static and dynamic instruments. They ionize sample molecules by bombarding them with a high-energy electron beam, causing them to be ionized into positively charged molecular ions and fragment ions. Ions with different mass-to-charge ratios arrive at the detector one after another due to differences in their trajectories under the influence of a magnetic field, ultimately forming a mass spectrum to analyze the composition of the matter. In practical applications, the sample introduction efficiency of a mass spectrometer has a decisive impact on detection throughput and analytical timeliness. Taking the patent technology with announcement number "CN117153658A" as an example, although the mass spectrometer sample introduction device disclosed therein achieves sequential sampling between test tubes through the cooperation of lifting and rotating mechanisms, and uses a sample delivery pump to transport the sample to the mass spectrometer, which improves the level of sample introduction automation to a certain extent, this technology still has significant limitations. First, the sample introduction process relies on manual placement of test tubes one by one into the injector. When facing large-scale detection needs, manual operation is time-consuming and cannot meet the efficiency requirements of high-throughput detection. At the same time, the sample introduction process adopts a single-tube extraction and injection mode, which cannot achieve continuous and uninterrupted sampling of multiple test tube samples. Frequent tube taking, placing, and liquid extraction actions significantly prolong the sample introduction cycle. It lacks an efficient sample transfer and positioning mechanism, making it difficult to quickly respond to the real-time detection needs of the mass spectrometer and limiting the overall performance of the instrument. It is evident that the existing technology has certain defects and shortcomings, and therefore needs to be improved and designed. Summary of the Invention

[0003] In order to improve the sample introduction efficiency during the application of existing technologies, this application provides a sample introduction device for an inductively coupled plasma mass spectrometer.

[0004] The present application provides a sample introduction device for an inductively coupled plasma mass spectrometer, which adopts the following technical solution: it includes a base plate, an inductively coupled plasma mass spectrometer body is fixedly installed on the top of the base plate, and a sample introduction mechanism is fixedly installed on one side of the inductively coupled plasma mass spectrometer body. The sample introduction mechanism includes an ultrasonic nebulizer and a fixing plate. The ultrasonic nebulizer is fixedly installed on the upper side of one side of the inductively coupled plasma mass spectrometer body. The fixing plate is fixedly installed on the top side of the inductively coupled plasma mass spectrometer body. A transport assembly is fixedly installed on the rear side of the top of the fixing plate. The output end of the transport assembly is connected to the input end of the ultrasonic nebulizer. The output end of the ultrasonic nebulizer is connected to the interior of the inductively coupled plasma mass spectrometer body. A drive assembly is fixedly installed on the top of the fixing plate. The rear side of the drive assembly is connected to the transport assembly. A conveying assembly is fixedly connected to the front end of the top of the drive assembly in a ring at equal intervals. The inner side of the conveying assembly holds a sample tube. A threaded sealing cap is threadedly connected to the top of the sample tube. A threaded bottom cap is threadedly connected to the bottom output end of the sample tube. A membrane to be punctured is fixedly connected to the inner middle of the threaded bottom cap.

[0005] Optionally, the conveying assembly includes a support frame, which is fixedly installed on the top rear side of the fixed plate. A suction tube is fixedly installed on the inner side of the support frame. A suction spiral drive blade is rotatably connected inside the suction tube. A rotating shaft is fixedly installed at the bottom of the suction spiral drive blade. A non-contact magnetic coupling is provided at the bottom of the suction tube. A connecting shaft is fixedly connected to the bottom of the non-contact magnetic coupling. The bottom end of the rotating shaft and the top end of the connecting shaft are connected to form a torque transmission connection through the non-contact magnetic coupling. The bottom of the connecting shaft is connected to the drive assembly. A self-sealing connection group is provided at the top of the suction tube. The bottom of the output end of the suction tube is connected to an ultrasonic atomizer through a connecting pipe.

[0006] Optionally, the self-sealing connection assembly includes a base tube, which is fixedly connected to the top of the suction tube. A sleeve is fixedly connected to the top of the base tube, and the sample tube is inserted into the sleeve. A sealing plate is rotatably connected to one side of the inside of the base tube. A telescopic spring is fixedly connected to the bottom of the sealing plate. The bottom end of the telescopic spring is fixedly connected to the side of the base tube that is hinged to the sealing plate. The sealing plate seals the connection between the base tube and the sleeve.

[0007] Optionally, the sample tube is inserted inside the base tube, and a sealing ring is fixedly connected to the outer surface of the sample tube. The sealing ring covers the gap between the sleeve and the sample tube. A piercing cone is fixedly connected to the bottom of the sleeve. The outer surface of the piercing cone has equally spaced annular holes. The holes penetrate the piercing cone, and the end of the piercing cone pierces the membrane to be pierced.

[0008] Optionally, the drive assembly includes a first motor and a small pulley. The first motor is fixedly installed at the bottom front end of the fixed plate. A large pulley is fixedly installed through the fixed plate at the output end of the first motor. The small pulley is fixedly connected to the lower end of the outer surface of the rotating shaft. The large pulley and the small pulley are connected by a transmission belt. A turntable is fixedly connected to the top of the large pulley. The conveying components are arranged in a ring at equal intervals and fixedly installed on the outer surface of the turntable.

[0009] Optionally, the drive assembly includes a first motor and a small pulley. The first motor is fixedly installed at the bottom front end of the fixed plate. A large pulley is fixedly installed through the fixed plate at the output end of the first motor. The small pulley is fixedly connected to the lower end of the outer surface of the rotating shaft. The large pulley and the small pulley are connected by a transmission belt. A turntable is fixedly connected to the top of the large pulley. The conveying components are arranged in a ring at equal intervals and fixedly installed on the outer surface of the turntable.

[0010] Optionally, the drive assembly includes a first motor and a small pulley. The first motor is fixedly installed at the bottom front end of the fixed plate. A large pulley is fixedly installed through the fixed plate at the output end of the first motor. The small pulley is fixedly connected to the lower end of the outer surface of the rotating shaft. The large pulley and the small pulley are connected by a transmission belt. A turntable is fixedly connected to the top of the large pulley. The conveying components are arranged in a ring at equal intervals and fixedly installed on the outer surface of the turntable.

[0011] Optionally, the longitudinal movement assembly includes a vertical rail, which is fixedly connected to the top of the sliding block. An electric push rod is fixedly installed on the outer side of the vertical rail. A top frame is fixedly connected to the output end of the electric push rod. A movable rod is fixedly connected to the outer end of the top frame. The movable rod is slidably connected to the inside of the vertical rail. The clamping assembly is fixedly connected to the middle of the outer side of the movable rod.

[0012] Optionally, the clamping assembly includes a rail frame, which is fixedly installed on the outer middle of the movable rod. A third motor is fixedly installed at one end of the rail frame, and the output end of the third motor is fixedly connected to a bidirectional lead screw through the rail frame. The threads at both ends of the outer surface of the bidirectional lead screw have opposite directions. Movable blocks are threaded to both ends of the bidirectional lead screw. A clamping arm is fixedly connected to the outer side of the movable block, and a clamping plate is fixedly connected to the outer end of the clamping arm. The sample tube is clamped on the inner side of the clamping plate.

[0013] Optionally, the clamping plate has a V-shaped top view, the movable block and the sliding block have a convex cross-sectional shape, and the internal cavity of the vertical rail and the internal cavity of the side rail are also convex in shape.

[0014] In summary, this application includes the following beneficial technical effects: This device, through its transport components, enables fully automated operation of sample tubes, significantly improving sample introduction efficiency. The reverse thread design of the bidirectional lead screw driven by the third motor precisely controls the clamping arm to grip the tubes, minimizing positioning errors. The second motor, in conjunction with the electric push rod, enables lateral transport and vertical insertion of the tubes. The entire process requires no manual intervention, preventing operational errors. The convex-shaped movable block, working in conjunction with the track, ensures stable and undisturbed transport of the tubes, guaranteeing accurate positioning each time. Furthermore, multiple transport components working in cyclical operation with the turntable allow for continuous and orderly sample delivery, significantly improving efficiency compared to traditional manual placement or single-sample transport. Additionally, the test tubes feature threaded sealing caps and bottom covers, facilitating disassembly, cleaning, and reuse, effectively reducing consumable costs. During the application of this device, its sample introduction mechanism innovatively adopts a power reuse design, eliminating the need for an additional delivery pump and reducing its operating costs. During operation, the first motor drives the turntable to transport samples while simultaneously amplifying the power through large and small pulleys. This power is then transmitted via a non-contact magnetic coupling to drive the pumping screw blades to rotate and generate negative pressure, enabling automatic sample extraction. The negative pressure controls the opening and closing of the sealing plate, precisely controlling the sample delivery channel. After sample introduction, the device is automatically sealed to prevent sample residue and contamination. This design converts transport power into pumping power, simplifying the equipment structure, reducing the number of components and energy consumption, and lowering equipment operation and maintenance costs. The automated continuous sample introduction process replaces the traditional single-tube extraction, greatly shortening the sample introduction time and improving sample processing efficiency. This device, through the coordinated operation of automated handling and sample introduction systems, comprehensively enhances the detection performance of mass spectrometers. Automated operation reduces human interference, ensuring consistency and accuracy of sample delivery and introduction, and improving the reliability of detection results. It eliminates the need for frequent manual operation, reducing labor intensity and minimizing duplicate testing caused by human error. The power reuse design simplifies the equipment structure, reduces the probability of failure, and improves equipment stability. Continuous automated sample introduction significantly increases detection throughput, enabling rapid processing of large numbers of samples to meet large-scale testing needs. Furthermore, its sealing plate, combined with a telescopic spring, automatically seals the sample introduction sleeve after injection, preventing sample contamination. Overall, it is better suited for high-timeliness, high-throughput scientific research and industrial testing scenarios, providing users with an efficient and stable testing solution. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure in an embodiment of this application; Figure 2 This is a schematic diagram of the rear view structure in an embodiment of this application; Figure 3 This is a schematic diagram of the overall structure of the drive component, conveying component, and transport component in the embodiments of this application; Figure 4 This is a bottom view of the drive component, conveying component, and transport component in the embodiments of this application; Figure 5 This is a top view of the drive component, conveying component, and transport component in the embodiments of this application; Figure 6 This is a schematic diagram of the clamping assembly structure in an embodiment of this application; Figure 7 This is a schematic diagram of the disassembled state structure of the conveying component in an embodiment of this application; Figure 8 This is a bottom view of the internal structure of the self-sealing connection assembly in an embodiment of this application; Figure 9 This is a schematic diagram of the internal structure of the sleeve in an embodiment of this application.

[0016] Figure reference numerals: 1. Base plate; 2. Inductively coupled plasma mass spectrometer body; 3. Sample introduction mechanism; 31. Ultrasonic nebulizer; 32. Fixing plate; 33. Conveying assembly; 331. Support frame; 332. Suction tube; 333. Suction screw drive blade; 334. Rotating shaft; 335. Non-contact magnetic coupling; 336. Connecting shaft; 337. Self-sealing connection assembly; 3371. Base tube; 3372. Sleeve; 3373. Sealing plate; 3374. Telescopic spring; 3375. Sealing ring; 3376. Puncture cone; 3377. Leakage hole; 3378. Membrane to be punctured; 34. Transport assembly; 341. Lateral movement assembly; 3 411. Side rail; 3412. Second motor; 3413. Transverse lead screw; 3414. Sliding block; 342. Longitudinal movement assembly; 3421. Vertical rail; 3422. Electric push rod; 3423. Top frame; 3424. Movable rod; 343. Clamping assembly; 3431. Rail frame; 3432. Third motor; 3433. Bidirectional lead screw; 3434. Movable block; 3435. Clamping arm; 3436. Clamping plate; 35. Drive assembly; 351. First motor; 352. Small pulley; 353. Large pulley; 354. Turntable; 355. Transmission belt; 36. Sample tube; 37. Threaded sealing cap; 38. Threaded bottom cap. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1-8 This application will be described in further detail.

[0018] This application discloses a sample introduction device for an inductively coupled plasma mass spectrometer. For example... Figure 1-8 As shown, it includes a base plate 1, an inductively coupled plasma mass spectrometer body 2 is fixedly installed on the top of the base plate 1, and a sample introduction mechanism 3 is fixedly installed on one side of the inductively coupled plasma mass spectrometer body 2. The sample introduction mechanism 3 includes an ultrasonic nebulizer 31 and a fixing plate 32. The ultrasonic nebulizer 31 is fixedly installed on the upper side of one side of the inductively coupled plasma mass spectrometer body 2. The fixing plate 32 is fixedly installed on the top side of the inductively coupled plasma mass spectrometer body 2. A conveying assembly 33 is fixedly installed on the rear side of the top of the fixing plate 32. The output end of the conveying assembly 33 is connected to the input end of the ultrasonic nebulizer 31. The output end of the ultrasonic nebulizer 31 is connected to the interior of the inductively coupled plasma mass spectrometer body 2. A driving assembly 35 is fixedly installed on the top of the fixing plate 32. The rear side of the driving assembly 35 is connected to the conveying assembly 33. The front side of the top of the driving assembly 35 is connected to the conveying assembly 33. A transport assembly 34 is fixedly connected in a ring at equal intervals at both ends. The inner side of the transport assembly 34 holds a sample tube 36. A threaded sealing cap 37 is threadedly connected to the top of the sample tube 36, and a threaded bottom cap 38 is threadedly connected to the bottom output end of the sample tube 36. A membrane to be punctured 3378 is fixedly connected to the inner center of the threaded bottom cap 38. During the application of this device, when the inductively coupled plasma mass spectrometer sample introduction device is working, the sample is loaded into the sample tube 36, and the threaded sealing cap 37 and the threaded bottom cap 38 are tightened. After the membrane 3378 is punctured and the bottom outlet is sealed, the first motor 351 of the drive assembly 35 starts, driving the turntable 354 to rotate, causing the transport assembly... The conveying assembly 34 moves in a circular cycle. When the conveying assembly 34 moves to the designated position, its internal clamping group 343, driven by the third motor 3432, drives the clamping arm 3435 and clamping plate 3436 to clamp the sample tube 36 via the bidirectional lead screw 3433. Subsequently, the second motor 3412 of the transverse moving group 341 drives the transverse lead screw 3413, causing the sliding block 3414 to move the sample tube 36 laterally to above the sleeve 3372 of the conveying assembly 33. Then, the electric push rod 3422 of the longitudinal moving group 342 pushes the top frame 3423 and the movable rod 3424 downward, inserting the sample tube 36 into the sleeve 3372. The piercing cone 337 at the bottom of the sleeve 3372... 6. The membrane to be punctured 3378 is punctured. At the same time, the first motor 351 transmits power to the small pulley 352 through the large pulley 353 and the transmission belt 355. The small pulley 352 drives the coupling shaft 336 to rotate. The non-contact magnetic coupling 335 drives the rotating shaft 334, causing the suction screw drive blade 333 to rotate and form a negative pressure in the suction tube 332. The negative pressure overcomes the elastic force of the telescopic spring 3374 and pushes open the sealing plate 3373 in the base tube 3371. The sample solution enters the suction tube 332 through the leakage hole 3377 on the puncture cone 3376, is transported to the ultrasonic nebulizer 31 for atomization through the delivery component 33, and finally enters the mass spectrometer body for detection, completing the sample introduction process.

[0019] Please refer to Figures 3-9The conveying assembly 33 includes a support frame 331, which is fixedly installed on the top rear side of the fixed plate 32. A suction pipe 332 is fixedly installed inside the support frame 331. A suction screw drive blade 333 is rotatably connected inside the suction pipe 332. A rotating shaft 334 is fixedly installed at the bottom of the suction screw drive blade 333. A non-contact magnetic coupling 335 is provided at the bottom of the suction pipe 332. A connecting shaft 336 is fixedly connected to the bottom of the non-contact magnetic coupling 335. The bottom end of the rotating shaft 334 and the top end of the connecting shaft 336 are connected by torque transmission through the non-contact magnetic coupling 335. The bottom of the connecting shaft 336 is connected to the drive assembly 35. A self-sealing connection group 337 is provided at the top of the suction pipe 332. The output end of the suction pipe 332... The bottom of the tube is connected to the ultrasonic atomizer 31 via a connecting tube. The self-sealing connection assembly 337 includes a base tube 3371, which is fixedly connected to the top of the suction tube 332. A sleeve 3372 is fixedly connected to the top of the base tube 3371. The sample tube 36 is inserted into the sleeve 3372. A sealing plate 3373 is rotatably connected to one side of the inside of the base tube 3371. A telescopic spring 3374 is fixedly connected to the bottom of the sealing plate 3373. The bottom end of the telescopic spring 3374 is fixedly connected to the side of the base tube 3371 that is hinged to the sealing plate 3373. The sealing plate 3373 seals the connection between the base tube 3371 and the sleeve 3372. The sample tube 36 is inserted into the inside of the base tube 3371. A [missing information - likely a device or component] is fixedly connected to the outer surface of the sample tube 36. A sealing ring 3375 covers the gap between the sleeve 3372 and the sample tube 36. A piercing cone 3376 is fixedly connected to the bottom of the sleeve 3372. The outer surface of the piercing cone 3376 has equally spaced annular holes 3377. The holes 3377 penetrate the piercing cone 3376, and the end of the piercing cone 3376 pierces the membrane 3378 to be pierced. During the application of this device, when the conveying component 33 is working, the driving component 35 drives the coupling shaft 336 to rotate. The coupling shaft 336 transmits torque to the rotating shaft 334 through the non-contact magnetic coupling 335, which in turn drives the suction spiral drive blade 333 in the suction tube 332 to rotate, forming a negative pressure inside the suction tube 332. When the conveying component 34 inserts the sample tube 36 into the sleeve 337... After step 2, the sealing ring 3375 on the outer surface of the test tube seals the gap between the sleeve 3372 and the test tube. The piercing cone 3376 at the bottom of the sleeve 3372 pierces the membrane 3378 at the bottom of the sample test tube 36, allowing the sample solution to flow out. At this time, the negative pressure in the suction tube 332 is greater than the pressure of the telescopic spring 3374 on the sealing plate 3373, overcoming the spring resistance and pushing the sealing plate 3373 to rotate, opening the connection between the base tube 3371 and the sleeve 3372. Under the action of negative pressure, the sample solution enters the base tube 3371 through the leakage hole 3377 on the piercing cone 3376, and is then transported to the bottom connecting tube through the suction tube 332, finally flowing into the ultrasonic nebulizer 31. After the sample injection is completed, the drive assembly 35 stops operating, and the suction spiral drive blade 333 no longer rotates.When the negative pressure inside the suction tube 332 disappears, the telescopic spring 3374 returns to its original deformation, pushing the sealing plate 3373 to flip and reseal the connection between the base tube 3371 and the sleeve 3372, preventing leakage of residual sample or entry of external impurities, and preparing for the next sample injection.

[0020] Please refer to Figures 1-7 The drive assembly 35 includes a first motor 351 and a small pulley 352. The first motor 351 is fixedly installed at the bottom front end of the fixed plate 32. The output end of the first motor 351 passes through the fixed plate 32 and is fixedly installed with a large pulley 353. The small pulley 352 is fixedly connected to the lower end of the outer surface of the rotating shaft 334. The large pulley 353 and the small pulley 352 are connected by a transmission belt 355. The top of the large pulley 353 is fixedly connected to a turntable 354. The conveying assembly 34 is fixedly installed on the outer surface of the turntable 354 in a ring with equal spacing. The conveying assembly 34 includes a transverse movement group 341, which is fixedly connected in a ring with equal spacing. Attached to the outer surface of the turntable 354, the top of the moving end of the transverse moving assembly 341 is fixedly connected to the longitudinal moving assembly 342, and the outer side of the longitudinal moving assembly 342 is fixedly connected to the clamping assembly 343. The sample tube 36 is clamped inside the clamping assembly 343. During operation of this device, the conveying assembly 33 operates under the power support of the driving assembly 35. The driving assembly 35 drives the coupling shaft 336 to rotate. With the help of the non-contact magnetic coupling 335, the torque is transmitted to the rotating shaft 334 without contact, thereby driving the suction spiral drive blade 333 inside the suction tube 332 to rotate at high speed, forming a negative pressure environment inside the suction tube 332. When the transport assembly 34 transports the sample... After test tube 36 is precisely inserted into sleeve 3372, the sealing ring 3375 on the outer surface of the test tube tightly fits against the inner wall of sleeve 3372, completing the seal between the two. At the same time, the piercing cone 3376 at the bottom of sleeve 3372 pierces the membrane 3378 to be pierced at the bottom of sample test tube 36, opening the outflow channel of sample solution. At this time, the negative pressure generated in suction tube 332 is greater than the pressure of extension spring 3374 acting on sealing plate 3373. The negative pressure pushes sealing plate 3373 to rotate against spring resistance, thereby opening the connection between base tube 3371 and sleeve 3372. Under the action of negative pressure suction, sample solution flows through the piercing cone. The evenly distributed leakage holes 3377 on 3376 flow into the base tube 3371, and then through the suction tube 332 and the bottom connecting tube, are delivered to the ultrasonic nebulizer 31. After the sample injection process is completed, the drive assembly 35 stops working, the suction spiral drive blade 333 loses power and stops rotating, the negative pressure in the suction tube 332 disappears, the telescopic spring 3374 returns to its initial deformation, pushes the sealing plate 3373 to flip and reset, and re-seals the connection between the base tube 3371 and the sleeve 3372. This can not only prevent residual sample leakage and contamination, but also isolate external impurities from entering, preparing for the next sample injection process and ensuring the sealing and continuity of the delivery process.

[0021] Please refer to Figures 3-7 The transverse movement assembly 341 includes side rails 3411, which are arranged in a ring at equal intervals and fixedly installed on the outside of the turntable 354. A second motor 3412 is fixedly installed on the inner side of the side rails 3411. A transverse lead screw 3413 is fixedly connected to the output end of the second motor 3412. The transverse lead screw 3413 is rotatably connected to the inside of the side rails 3411. A sliding block 3414 is threadedly connected to the outer surface of the transverse lead screw 3413. The sliding block 3414 is slidably connected to the inside of the side rails 3411. The top of the sliding block 3414 is connected to the bottom of the longitudinal movement assembly 342. 42 includes a vertical rail 3421, which is fixedly connected to the top of the sliding block 3414. An electric push rod 3422 is fixedly installed on the outer side of the vertical rail 3421. A top frame 3423 is fixedly connected to the output end of the electric push rod 3422. A movable rod 3424 is fixedly connected to the outer end of the top frame 3423. The movable rod 3424 is slidably connected to the inside of the vertical rail 3421. A clamping assembly 343 is fixedly connected to the middle of the outer side of the movable rod 3424. During the application of this device, its transverse movement assembly 341 and longitudinal movement assembly 342 work together to achieve precise positioning of the sample tube 36. When it is necessary to move... When the sample tube 36 is moved, the second motor 3412 in the transverse moving assembly 341 starts, driving the transverse lead screw 3413 to rotate within the side rail 3411. Since the sliding block 3414 is threadedly connected to the transverse lead screw 3413, when the lead screw rotates, the sliding block 3414 is driven by the threaded transmission and slides laterally along the internal track of the side rail 3411, thereby driving the longitudinal moving assembly 342 connected to the top of the sliding block 3414 to move laterally as a whole. When the lateral movement reaches the target position, the longitudinal moving assembly 342 starts working, the electric push rod 3422 starts, and its output end pushes the top frame 3423 to move. The top frame 3423 drives the movable rod 3424 to slide vertically inside the vertical rail 3421. Since the clamping group 343 is fixedly connected to the middle of the outer side of the movable rod 3424, the lifting and lowering of the movable rod 3424 can drive the clamping group 343 and the sample tube 36 inside the clamping group 343 to move up and down, thereby adjusting the position of the sample tube 36 in the vertical direction. Through the cooperation of the lateral sliding of the transverse group 341 and the vertical lifting and lowering of the longitudinal group 342, the sample tube 36 can be accurately transferred to the designated position, meeting the requirements of the sample injection device for precise positioning and placement of the sample tube 36.

[0022] Please refer to Figures 1-7The clamping assembly 343 includes a rail frame 3431, which is fixedly installed on the outer middle of the movable rod 3424. A third motor 3432 is fixedly installed at one end of the rail frame 3431. The output end of the third motor 3432 passes through the rail frame 3431 and is fixedly connected to a bidirectional lead screw 3433. The threads at both ends of the outer surface of the bidirectional lead screw 3433 have opposite directions. Movable blocks 3434 are threaded to both ends of the bidirectional lead screw 3433. A clamping arm 3435 is fixedly connected to the outer side of the movable block 3434. A clamping plate 3436 is fixedly connected to the outer end of the clamping arm 3435. Sample tube 3 6. Clamped inside the clamping plate 3436, the clamping plate 3436 has a V-shaped top view. The overall cross-sectional shape of the movable block 3434 and the sliding block 3414 is convex. The overall cross-sectional shape of the internal cavity of the vertical rail 3421 and the internal cavity of the side rail 3411 is also convex. During the application of this device, when the clamping assembly 343 is working, the third motor 3432 drives the bidirectional lead screw 3433 to rotate. Since the threads at both ends of the bidirectional lead screw 3433 rotate in opposite directions, the movable blocks 3434 connected to the threads at both ends of the lead screw will rotate in opposite directions according to the rotation direction of the lead screw. The two moving blocks 3434 can move in opposite directions. When it is necessary to clamp the sample tube 36, the third motor 3432 drives the bidirectional lead screw 3433 to rotate, causing the two moving blocks 3434 to move in opposite directions. This drives the clamping arm 3435, which is fixed on the outside of the moving block 3434, to move inward. This causes the V-shaped clamping plate 3436 at the outer end of the clamping arm 3435 to clamp the sample tube 36. The V-shaped clamping plate 3436 is designed to better fit the circular contour of the tube, providing a stable and uniform clamping force to ensure that the sample tube 36 is firmly fixed. When it is necessary to release the sample tube 36, the third motor 3432 drives the two moving blocks 3434 in the opposite direction. The bidirectional lead screw 3433 causes the movable block 3434 to move in opposite directions, and the clamping arm 3435 and clamping plate 3436 move outward accordingly, releasing the sample tube 36. In addition, the movable block 3434, the sliding block 3414, the vertical rail 3421, and the side rail 3411 all adopt a convex cross-section design. This structure can effectively prevent the movable block 3434 from derailing or shaking when sliding within the rail frame 3431 and the sliding block 3414 moves within the side rail 3411 and the vertical rail 3421, ensuring the stability and accuracy of the clamping assembly 343 in the process of clamping and transferring the sample tube 36.

[0023] The implementation principle of the sample introduction device of the inductively coupled plasma mass spectrometer in this application embodiment is as follows: The device realizes the fully automated operation of the sample tube 36 through the handling component 34. In the specific operation process, the operator first places the sample tube 36 between the two V-shaped clamping plates 3436 of the clamping group 343, and then starts the third motor 3432. After the third motor 3432 runs, it drives the bidirectional lead screw 3433 connected to it to rotate. Since the two ends of the bidirectional lead screw 3433 adopt the opposite thread direction design, the two movable blocks 3434 connected to the lead screw can move in opposite directions. The movement of the movable blocks 3434 drives the clamping arm 3435 fixed on it to move inward synchronously, thereby causing the clamping plate 3436 to clamp the sample tube 36 and realize the precise positioning of the sample tube 36. After clamping and positioning are completed, the second motor 3412 is started. When the second motor 3412 is running, it drives the transverse lead screw 3413 to rotate. The sliding block 3414, which is threadedly connected to the transverse lead screw 3413, slides laterally within the side rail 3411, thereby moving the clamping assembly 343 together with the clamped sample tube 36 to directly above the sleeve 3372. At this time, the electric push rod 3422 is started. The electric push rod 3422 pushes the top frame 3423, which drives the movable rod 3424 to move downward, so that the sample tube 36 can be smoothly inserted into the sleeve 3372. During the insertion process, the bottom of the tube to be punctured... The membrane 3378 is pierced by the piercing cone 3376 at the bottom of the sleeve 3372, allowing the sample solution to communicate with the outside through the evenly distributed leakage holes 3377 on the piercing cone 3376, preparing for subsequent sample extraction. After the sample injection process is completed, the operator can start the third motor 3432 and the second motor 3412 to rotate in the opposite direction, causing the transport component 34 to move in the opposite direction, smoothly moving the sample tube 36 out of the sleeve 3372, preparing for the next sample handling operation. This design enables the entire device to realize the function of automatically handling the sample tube 36, ensuring the continuity and efficiency of the automatic sample injection process. In practical applications, the conveying assembly 34 employs a three-dimensional motion design consisting of a transverse movement group 341, a longitudinal movement group 342, and a clamping group 343. Combined with the U-shaped movable block 3434 and the track, this mechanical structure ensures the stability of the sample tube 36 during transport. During movement, the U-shaped movable block 3434 closely engages with the track, effectively limiting its swaying and offset, thus maintaining the sample tube 36 in a stable, undisturbed state during transport and significantly reducing positioning errors. Simultaneously, the first motor 351 drives the turntable 354 to rotate... The rotating mechanism allows multiple transport components 34 to sequentially transport sample tubes 36 to the sleeve 3372, achieving continuous and orderly sample transport. Compared to the traditional method of manually placing samples or transporting samples one by one, this design significantly improves sample transport efficiency and effectively reduces possible errors during human operation. In addition, the top and bottom of the sample tubes 36 are connected by threaded sealing caps 37 and threaded bottom caps 38. This connection method allows the sample tubes 36 to be easily disassembled and cleaned after use, enabling reuse and reducing the overall operating cost of the equipment. The design of the sample introduction mechanism 3 realizes automated continuous sample introduction and efficient power utilization. When the sample tube 36 is inserted into the sleeve 3372, the membrane 3378 is punctured, and the sample solution obtains an outflow channel. While the first motor 351 drives the turntable 354 to drive the conveying component 34, its power is transmitted to the small pulley 352 through the large pulley 353 and the transmission belt 355. Since the diameter of the large pulley 353 is larger than that of the small pulley 352, according to the principle of mechanical transmission, this structure can efficiently amplify the power. After receiving the amplified power, the small pulley 352 drives the coupling shaft 33. 6. The shaft 334 is driven to rotate by the non-contact magnetic coupling 335, which in turn causes the pumping screw drive blade 333 to rotate at high speed. The pumping and suction effect generated by the rotation of the pumping screw drive blade 333 creates a negative pressure environment inside the base tube 3371. Under the action of negative pressure, the sealing plate 3373 rotates against the elastic force of the telescopic spring 3374, opening the communication channel between the base tube 3371 and the sleeve 3372. Under the drive of negative pressure, the sample solution enters the suction tube 332 through the leak hole 3377, and is then transported to the ultrasonic nebulizer 31 through the connecting tube, finally completing the sample injection process. After the sample injection is completed, the first motor 351 stops running, the pumping screw drive blade 333 loses its power source, and the negative pressure in the suction tube 332 disappears. At this time, the telescopic spring 3374 returns to its original deformation, pushing the sealing plate 3373 to flip and move upward, resealing the bottom of the base tube 3371, effectively preventing sample residue or external contaminants from entering, ensuring the cleanliness and sealing performance of the sample injection system. This sample injection mechanism 3 does not require an additional delivery pump, and the power required for sample handling is reused and converted into the power for sample pumping. This design simplifies the equipment structure, reduces the number of equipment parts and energy consumption, thereby reducing equipment costs. At the same time, the automated continuous sample injection process significantly improves the sample injection efficiency, reduces sample waiting time, and increases the overall detection throughput of the mass spectrometer compared to the traditional single-tube extraction method, making it easier to adapt to large-scale sample injection detection.

[0024] 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, characterized in that; Includes a base plate (1), on the top of which an inductively coupled plasma mass spectrometer body (2) is fixedly installed, and on one side of the inductively coupled plasma mass spectrometer body (2) a sample introduction mechanism (3) is fixedly installed. The sample introduction mechanism (3) includes an ultrasonic nebulizer (31) and a fixing plate (32). The ultrasonic nebulizer (31) is fixedly installed on the upper side of one side of the inductively coupled plasma mass spectrometer body (2). The fixing plate (32) is fixedly installed on the top side of the inductively coupled plasma mass spectrometer body (2). A delivery assembly (33) is fixedly installed on the rear side of the top of the fixing plate (32). The output end of the delivery assembly (33) is connected to the input end of the ultrasonic nebulizer (31). The output end of the ultrasonic nebulizer (31) is connected to the interior of the inductively coupled plasma mass spectrometer body (2). A drive assembly (35) is fixedly installed on the top of the fixed plate (32). The rear side of the drive assembly (35) is connected to the conveying assembly (33). A transport assembly (34) is fixedly connected to the front end of the top of the drive assembly (35) in a ring with equal spacing. A sample tube (36) is held in the inner side of the transport assembly (34). A threaded sealing cap (37) is threadedly connected to the top of the sample tube (36). A threaded bottom cap (38) is threadedly connected to the bottom output end of the sample tube (36). A puncturable film (3378) is fixedly connected to the middle of the inner side of the threaded bottom cap (38).

2. The sample introduction device for an inductively coupled plasma mass spectrometer according to claim 1, characterized in that: The conveying assembly (33) includes a support frame (331), which is fixedly installed on the top rear side of the fixed plate (32). A suction pipe (332) is fixedly installed on the inner side of the support frame (331). A suction screw drive blade (333) is rotatably connected inside the suction pipe (332). A rotating shaft (334) is fixedly installed at the bottom of the suction screw drive blade (333). A non-contact magnetic coupling (335) is provided at the bottom of the suction pipe (332). The bottom of the non-contact magnetic coupling (335) is fixedly connected to a coupling shaft (336). The bottom end of the rotating shaft (334) and the top end of the coupling shaft (336) are connected by the non-contact magnetic coupling (335) to form a torque transmission connection. The bottom of the coupling shaft (336) is connected to the drive assembly (35) for transmission. The top of the suction tube (332) is provided with a self-sealing connection group (337). The bottom of the output end of the suction tube (332) is connected to the ultrasonic atomizer (31) through a connecting tube.

3. The sample introduction device for an inductively coupled plasma mass spectrometer according to claim 2, characterized in that: The self-sealing connection assembly (337) includes a base tube (3371), which is fixedly connected to the top of the suction tube (332). A sleeve (3372) is fixedly connected to the top of the base tube (3371). The sample tube (36) is inserted into the sleeve (3372). A sealing plate (3373) is rotatably connected to one side of the inside of the base tube (3371). A telescopic spring (3374) is fixedly connected to the bottom of the sealing plate (3373). The bottom end of the telescopic spring (3374) is fixedly connected to the side of the base tube (3371) that is hinged to the sealing plate (3373). The sealing plate (3373) seals the connection between the base tube (3371) and the sleeve (3372).

4. The sample introduction device for an inductively coupled plasma mass spectrometer according to claim 3, characterized in that: The sample tube (36) is inserted inside the base tube (3371). A sealing ring (3375) is fixedly connected to the outer surface of the sample tube (36). The sealing ring (3375) covers the gap between the sleeve (3372) and the sample tube (36). A piercing cone (3376) is fixedly connected to the bottom of the sleeve (3372). The outer surface of the piercing cone (3376) is provided with equally spaced annular holes (3377). The holes (3377) penetrate the piercing cone (3376). The end of the piercing cone (3376) pierces the membrane (3378) to be pierced.

5. The sample introduction device for an inductively coupled plasma mass spectrometer according to claim 2, characterized in that: The drive assembly (35) includes a first motor (351) and a small pulley (352). The first motor (351) is fixedly installed at the bottom front end of the fixed plate (32). The output end of the first motor (351) passes through the fixed plate (32) and is fixedly installed with a large pulley (353). The small pulley (352) is fixedly connected to the lower end of the outer surface of the rotating shaft (334). The large pulley (353) and the small pulley (352) are connected by a transmission belt (355). The top of the large pulley (353) is fixedly connected to a turntable (354). The conveying assembly (34) is arranged in a ring at equal intervals and fixedly installed on the outer surface of the turntable (354).

6. The sample introduction device for an inductively coupled plasma mass spectrometer according to claim 5, characterized in that: The transport assembly (34) includes a transverse group (341), which is arranged in a ring at equal intervals and fixedly connected to the outer surface of the turntable (354). A longitudinal group (342) is fixedly connected to the top of the moving end of the transverse group (341), and a clamping group (343) is fixedly connected to the outside of the longitudinal group (342). The sample tube (36) is clamped inside the clamping group (343).

7. The sample introduction device for an inductively coupled plasma mass spectrometer according to claim 6, characterized in that: The transverse movement assembly (341) includes a side rail (3411), which is fixedly installed on the outside of the turntable (354) in a ring-shaped arrangement at equal intervals. A second motor (3412) is fixedly installed on the inside of the side rail (3411). A transverse lead screw (3413) is fixedly connected to the output end of the second motor (3412). The transverse lead screw (3413) is rotatably connected to the inside of the side rail (3411). A sliding block (3414) is threadedly connected to the outer surface of the transverse lead screw (3413). The sliding block (3414) is slidably connected to the inside of the side rail (3411). The top of the sliding block (3414) is connected to the bottom of the longitudinal movement assembly (342).

8. The sample introduction device for an inductively coupled plasma mass spectrometer according to claim 7, characterized in that: The longitudinal movement assembly (342) includes a vertical rail (3421), which is fixedly connected to the top of the sliding block (3414). An electric push rod (3422) is fixedly installed on the outer side of the vertical rail (3421). A top frame (3423) is fixedly connected to the output end of the electric push rod (3422). A movable rod (3424) is fixedly connected to the outer end of the top frame (3423). The movable rod (3424) is slidably connected to the inside of the vertical rail (3421). The clamping assembly (343) is fixedly connected to the middle of the outer side of the movable rod (3424).

9. The sample introduction device for an inductively coupled plasma mass spectrometer according to claim 8, characterized in that: The clamping assembly (343) includes a rail frame (3431), which is fixedly installed on the outer middle of the movable rod (3424). A third motor (3432) is fixedly installed at one end of the rail frame (3431). The output end of the third motor (3432) passes through the rail frame (3431) and is fixedly connected to a bidirectional lead screw (3433). The threads at both ends of the outer surface of the bidirectional lead screw (3433) are opposite in direction. Movable blocks (3434) are threaded to both ends of the bidirectional lead screw (3433). A clamping arm (3435) is fixedly connected to the outer side of the movable block (3434). A clamping plate (3436) is fixedly connected to the outer end of the clamping arm (3435). The sample tube (36) is clamped on the inner side of the clamping plate (3436).

10. The sample introduction device for an inductively coupled plasma mass spectrometer according to claim 9, characterized in that: The clamping plate (3436) has a V-shaped top view, and the overall cross-sectional shape of the movable block (3434) and sliding block (3414) is convex. The overall cross-sectional shape of the internal cavity of the vertical rail (3421) and the internal cavity of the side rail (3411) is also convex.

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