Sample introduction device of inductively coupled plasma mass spectrometer

Abstract

The invention 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 an inductively coupled plasma mass spectrometer body is fixedly mounted at the top of the bottom plate. During application, the sample introduction mechanism adopts a first motor to drive a turntable to carry a sample during use, power is amplified through transmission of a large belt wheel and a small belt wheel, and a non-contact magnetic coupling drives a pumping spiral driving blade to rotate to generate negative pressure, so that automatic sample extraction, negative pressure control of opening and closing of a plugging plate and accurate control of a sample conveying channel are realized; by means of the design, carrying power is converted into pumping power, the equipment structure is simplified, the number of parts and energy consumption are reduced, the equipment operation and maintenance cost is reduced, an automatic continuous sample injection process replaces traditional single-pipe extraction, the sample injection time is greatly shortened, and the sample treatment efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of mass spectrometer sampling, in particular to a sampling device of an inductively coupled plasma mass spectrometer. BACKGROUND

[0002] As a core instrument based on the principle of electromagnetic deflection of charged particles, mass spectrometers realize the separation and detection of mass differences of atoms, molecules or fragment ions of substances, and play a key role in the fields of isotope analysis, inorganic element determination and organic compound structure identification. According to the application range, it can be divided into isotope mass spectrometer, inorganic mass spectrometer and organic mass spectrometer; according to the performance parameters, it covers high, medium and low resolution mass spectrometers; according to the working principle, it is divided into static and dynamic instruments. High-energy electron flow bombards sample molecules to ionize them into positively charged molecular ions and fragment ions. Different mass-to-charge ratio ions reach the detector in sequence under the action of the magnetic field due to the difference in motion trajectory, and finally form a mass spectrum to analyze the composition of the substance. In practical application, the sampling efficiency of the mass spectrometer has a decisive influence on the detection flux and the analysis timeliness. For example, the patent technology with the announcement number "CN117153658A" discloses a mass spectrometer sampling device which realizes sequential sampling of the sampling needle between test tubes through the cooperation of the lifting mechanism and the rotating mechanism, and transports the test sample to the mass spectrometer by means of the sample pump, thereby improving the automatic level of sampling to a certain extent. However, the technology still has significant limitations. First, the sampling process relies on manual placement of test tubes in the sampler one by one. When facing large-scale detection requirements, manual operation is time-consuming and long, and it is difficult to meet the efficiency requirements of high-throughput detection. At the same time, the sampling process adopts a single-tube injection mode, which cannot realize continuous and uninterrupted sampling of multiple test tubes. Frequent tube taking, tube placing and liquid pumping actions significantly prolong the sampling period. The device lacks efficient sample transmission and positioning mechanisms, and it is difficult to quickly respond to the real-time detection requirements of the mass spectrometer, thereby limiting the overall performance of the instrument. It can be seen that the existing technology has certain defects and deficiencies, and therefore needs to be improved and designed. SUMMARY

[0003] In order to improve the sampling efficiency during the application of the prior art, the application provides a sampling device of an inductively coupled plasma mass spectrometer.

[0004] The sampling device of the inductively coupled plasma mass spectrometer provided by the application adopts the following technical scheme: a bottom plate is provided, a top of the bottom plate is fixedly installed with an inductively coupled plasma mass spectrometer body, and one side of the inductively coupled plasma mass spectrometer body is fixedly installed with a sampling mechanism. The sample injection mechanism includes an ultrasonic atomizer and a fixed plate, the ultrasonic atomizer is fixedly installed on the one side of the top of the inductively coupled plasma mass spectrometer body, the fixed plate is fixedly installed on one side of the top of the inductively coupled plasma mass spectrometer body, the top rear side of the fixed plate is fixedly installed with a conveying assembly, the output end of the conveying assembly is communicated with the input end of the ultrasonic atomizer, the output end of the ultrasonic atomizer is communicated with the inside of the inductively coupled plasma mass spectrometer body, the top of the fixed plate is fixedly installed with a driving assembly, the rear side of the driving assembly is drivingly connected with the conveying assembly, the top front end of the driving assembly is fixedly connected with a carrying assembly in a ring shape at equal intervals, the inside of the carrying assembly clamps a sample test tube, the top of the sample test tube is threadedly connected with a threaded sealing cover, the bottom output end of the sample test tube is threadedly connected with a threaded bottom cover, and the inside of the threaded bottom cover is fixedly connected with a to-be-pierced adhesive film in the middle.

[0005] Optionally, the conveying assembly includes a support frame fixedly installed on the top rear side of the fixed plate, a suction pipe fixedly installed on the inside of the support frame, a suction spiral drive blade rotatably connected in the inside of the suction pipe, a rotating shaft fixedly installed on the bottom of the suction spiral drive blade, a non-contact magnetic coupling provided on the bottom of the suction pipe, a connecting shaft fixedly connected on the bottom of the non-contact magnetic coupling, a torque transmission connection formed between the bottom end of the rotating shaft and the top end of the connecting shaft through the non-contact magnetic coupling, a driving connection between the bottom of the connecting shaft and the driving assembly, a self-sealing connection group provided on the top of the suction pipe, and a communication between the output end of the suction pipe and the ultrasonic atomizer through a connecting pipe.

[0006] Optionally, the self-sealing connection group includes a base pipe fixedly connected to the top of the suction pipe, a sleeve fixedly connected to the top of the base pipe, the sample test tube inserted into the inside of the sleeve, a sealing plate rotatably connected to one side in the inside of the base pipe, an extension spring fixedly connected to the bottom of the sealing plate, the bottom end of the extension spring fixedly connected to the side close to the sealing plate in the inside of the base pipe, and the sealing plate sealed at the communication port of the base pipe and the sleeve.

[0007] Optionally, the sample test tube is inserted into the inside of the base pipe, a sealing ring fixedly connected to the outer surface of the sample test tube, the sealing ring covering the gap between the sleeve and the sample test tube, a piercing cone fixedly connected to the inside bottom of the sleeve, a plurality of leak holes annularly and equidistantly arranged on the outer surface of the piercing cone, the leak holes penetrating through the piercing cone, and the end of the piercing cone piercing the to-be-pierced adhesive film.

[0008] Optionally, the driving assembly comprises 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 at the output end of the first motor penetrating through the fixed plate, 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 drivingly connected through a transmission belt, and the top of the large pulley is fixedly connected with a rotating disc.

[0009] Optionally, the driving assembly comprises 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 at the output end of the first motor penetrating through the fixed plate, 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 drivingly connected through a transmission belt, and the top of the large pulley is fixedly connected with a rotating disc.

[0010] Optionally, the driving assembly comprises 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 at the output end of the first motor penetrating through the fixed plate, 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 drivingly connected through a transmission belt, and the top of the large pulley is fixedly connected with a rotating disc.

[0011] Optionally, the longitudinal moving assembly comprises a vertical rail, the vertical rail is fixedly connected to the top of the sliding block, an electric push rod is fixedly installed at the outer side of the vertical rail, the output end of the electric push rod is fixedly connected with a top frame, the outer end of the top frame is fixedly connected with a movable rod, the movable rod is slidingly connected to the inside of the vertical rail, and the clamping assembly is fixedly connected to the outer middle part of the movable rod.

[0012] Optionally, the clamping assembly comprises a rail frame, the rail frame is fixedly installed at the outer middle part of the movable rod, a third motor is fixedly installed at one end of the rail frame, a bidirectional screw rod is fixedly connected to the output end of the third motor penetrating through the rail frame, the thread rotation directions of the two ends of the outer surface of the bidirectional screw rod are opposite, movable blocks are threadedly connected to the two ends of the bidirectional screw rod, clamping arms are fixedly connected to the outer side of the movable blocks, clamping plates are fixedly connected to the outer end of the clamping arms, and the sample test tubes are clamped to the inner side of the clamping plates.

[0013] Optionally, the clamping plates are in V-shaped arrangement in plan view, the overall cross-sectional shapes of the movable blocks and the sliding blocks are in convex-shaped arrangement, and the overall cross-sectional shapes of the internal cavities of the vertical rails and the internal cavities of the side rails are also in convex-shaped arrangement.

[0014] In summary, the present application has the following beneficial technical effects: The device can realize full-process automatic operation of sample test tubes, significantly improve sample efficiency, and accurately control the clamping arm to clamp the test tube through the reverse thread design of the bidirectional screw rod driven by the third motor, with minimal positioning error; the second motor cooperates with the electric push rod to realize horizontal transfer and vertical insertion of the test tube, and the whole process does not need manual intervention, avoids operation errors, the cooperation of the convex-shaped movable block and the track ensures the stability of the test tube during transportation and prevents shaking, and ensures accurate positioning each time. In addition, the multiple carrying assemblies cooperate with the rotating disc to work in a cycle, which can continuously and orderly transport samples, and the efficiency is greatly improved compared with traditional manual placement or single sample carrying. At the same time, the test tube is provided with a threaded connection sealing cover and a bottom cover, which is convenient for disassembly, cleaning and reuse, and effectively reduces the cost of consumables; During the application of the device, the sample inlet mechanism innovatively adopts power reuse design, does not need an additional conveying pump, and can reduce the use cost. During use, the first motor drives the rotating disc to carry the sample, amplifies the power through the large and small pulleys, drives the suction spiral driving blade to rotate to generate negative pressure through the non-contact magnetic coupling, realizes automatic sample suction, controls the opening and closing of the blocking plate through negative pressure, accurately controls the sample conveying channel, automatically seals after sample inlet is completed, prevents sample residue and pollution, this 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 the automatic continuous sample inlet process replaces the traditional single tube suction, greatly shortens the sample inlet time, and improves the sample processing efficiency; Through the cooperation of the automatic carrying and sample inlet system, the detection performance of the mass spectrometer can be comprehensively improved. Automatic operation reduces human factor interference, ensures the consistency and accuracy of sample conveying and sample inlet, improves the reliability of detection results, reduces labor intensity, reduces repeated detection caused by human error, simplifies the equipment structure through power reuse design, reduces the probability of failure, improves the stability of the equipment, continuously and automatically samples to greatly improve the detection flux, quickly process a large number of samples, meet large-scale detection demand, and the blocking plate cooperates with the extension spring to automatically block the sleeve of the sample inlet after the sample inlet is completed, which can avoid sample pollution. The whole device can be better applied to high-time-efficiency and high-throughput scientific research and industrial detection scenes, and provides an efficient and stable detection solution for users. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a whole structure schematic diagram in the embodiment of the application; Figure 2 is a rear view structure schematic diagram in the embodiment of the application; Figure 3 is a whole structure schematic diagram of the driving assembly, the conveying assembly and the carrying assembly in the embodiment of the application; Figure 4 is a bottom view structure schematic diagram of the driving assembly, the conveying assembly and the carrying assembly in the embodiment of the application; Figure 5 is a top view structural schematic diagram of a driving assembly, a conveying assembly and a carrying assembly in an embodiment of the present application; Figure 6 is a structural schematic diagram of a clamping assembly in an embodiment of the present application; Figure 7 is a structural schematic diagram of a conveying assembly in a disassembled state in an embodiment of the present application; Figure 8 is a bottom view structural schematic diagram of a self-sealing connection assembly in an embodiment of the present application; Figure 9 is a structural schematic diagram of a sleeve in an embodiment of the present application.

[0016] The reference signs are as follows: 1, bottom plate; 2, inductively coupled plasma mass spectrometer body; 3, sample feeding mechanism; 31, ultrasonic atomizer; 32, fixed plate; 33, conveying assembly; 331, support frame; 332, suction pipe; 333, suction spiral driving blade; 334, rotating shaft; 335, non-contact magnetic coupling; 336, connecting shaft; 337, self-sealing connection assembly; 3371, base pipe; 3372, sleeve; 3373, sealing plate; 3374, extension spring; 3375, sealing ring; 3376, piercing cone; 3377, leakage hole; 3378, to-be-pierced adhesive film; 34, carrying assembly; 341, horizontal moving group; 3411, side rail; 3412, second motor; 3413, horizontal screw rod; 3414, sliding block; 342, vertical moving group; 3421, vertical rail; 3422, electric push rod; 3423, top frame; 3424, movable rod; 343, clamping group; 3431, rail frame; 3432, third motor; 3433, bidirectional screw rod; 3434, movable block; 3435, clamping arm; 3436, clamping plate; 35, driving assembly; 351, first motor; 352, small pulley; 353, large pulley; 354, rotating disc; 355, transmission belt; 36, sample test tube; 37, threaded sealing cover; 38, threaded bottom cover. DETAILED DESCRIPTION

[0017] The following will be described in detail in combination with the accompanying Figures 1-8 The present application will be further described in detail.

[0018] The embodiment of the present application discloses a sample feeding device of an inductively coupled plasma mass spectrometer. Figures 1-8 As shown in the drawings, the sample feeding device comprises a bottom plate 1, a top portion of the bottom plate 1 is fixedly installed with an inductively coupled plasma mass spectrometer body 2, one side of the inductively coupled plasma mass spectrometer body 2 is fixedly installed with a sample feeding mechanism 3; The sample injection mechanism 3 comprises an ultrasonic atomizer 31 and a fixed plate 32, the ultrasonic atomizer 31 is fixedly installed on one side of the top of the inductively coupled plasma mass spectrometer body 2, the fixed plate 32 is fixedly installed on one side of the top of the inductively coupled plasma mass spectrometer body 2, the top rear side of the fixed plate 32 is fixedly installed with a conveying assembly 33, the output end of the conveying assembly 33 is communicated with the input end of the ultrasonic atomizer 31, the output end of the ultrasonic atomizer 31 is communicated with the inside of the inductively coupled plasma mass spectrometer body 2, the top of the fixed plate 32 is fixedly installed with a driving assembly 35, the rear side of the driving assembly 35 is drivingly connected with the conveying assembly 33, the top front end of the driving assembly 35 is fixedly connected with a carrying assembly 34 in a ring shape at equal intervals, the inside of the carrying assembly 34 clamps a sample test tube 36, the top of the sample test tube 36 is threadedly connected with a threaded sealing cover 37, the bottom output end of the sample test tube 36 is threadedly connected with a threaded bottom cover 38, the inside of the threaded bottom cover 38 is fixedly connected with a to-be-pierced adhesive film 3378, during the application of the device, when the inductively coupled plasma mass spectrometer sample injection device works, the sample is loaded into the sample test tube 36 and the threaded sealing cover 37 and the threaded bottom cover 38 are screwed tightly, the to-be-pierced adhesive film 3378 seals the bottom outlet, after the first motor 351 of the driving assembly 35 is started, the rotating disc 354 is driven to rotate, so that the carrying assembly 34 moves in a ring shape, when the carrying assembly 34 moves to a specified position, the clamping assembly 343 in the inside is driven by the third motor 3432 to clamp the sample test tube 36 through the bidirectional lead screw 3433 and the clamping arm 3435 and the clamping plate 3436, then the second motor 3412 of the transverse moving assembly 341 drives the transverse lead screw 3413, so that the sliding block 3414 drives the sample test tube 36 to move transversely to above the sleeve 3372 of the conveying assembly 33, then the electric push rod 3422 of the vertical moving assembly 342 pushes the top frame 3423 and the movable rod 3424 to move downward, so that the sample test tube 36 is inserted into the sleeve 3372, the piercing cone 3376 at the bottom of the sleeve 3372 pierces the to-be-pierced adhesive film 3378, 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 connecting shaft 336 to rotate, the rotating shaft 334 is driven through the non-contact magnetic coupling 335, so that the suction spiral driving blade 333 rotates to form negative pressure in the suction pipe 332, the negative pressure overcomes the elastic force of the expansion spring 3374 to push away the blocking plate 3373 in the base pipe 3371, the sample solution enters the suction pipe 332 through the leakage hole 3377 on the piercing cone 3376, is atomized by the conveying assembly 33 and enters the mass spectrometer body for detection, and the sample injection process is completed.

[0019] Please refer to Figures 3-9The conveying assembly 33 comprises a support frame 331 fixedly installed at the top rear side of the fixed plate 32, the inner side of the support frame 331 is fixedly installed with a suction pipe 332, the inside of the suction pipe 332 is rotationally connected with a suction spiral driving blade 333, the bottom of the suction spiral driving blade 333 is fixedly installed with a rotating shaft 334, the bottom of the suction pipe 332 is provided with a non-contact magnetic coupling 335, the bottom of the non-contact magnetic coupling 335 is fixedly connected with a connecting shaft 336, the bottom end of the rotating shaft 334 and the top end of the connecting shaft 336 are connected in torque transmission through the non-contact magnetic coupling 335, the bottom of the connecting shaft 336 is drivingly connected with the driving assembly 35, the top of the suction pipe 332 is provided with a self-sealing connection group 337, the bottom of the output end of the suction pipe 332 is connected in communication with the ultrasonic atomizer 31 through a connecting pipe, the self-sealing connection group 337 comprises a base pipe 3371 fixedly connected to the top of the suction pipe 332, a sleeve pipe 3372 fixedly connected to the top of the base pipe 3371, the sample test tube 36 is inserted into the inside of the sleeve pipe 3372, a sealing plate 3373 rotationally connected to one side of the inside of the base pipe 3371, the bottom of the sealing plate 3373 is fixedly connected with a telescopic spring 3374, the bottom end of the telescopic spring 3374 is fixedly connected with the side of the inside of the base pipe 3371 close to the sealing plate 3373, the sealing plate 3373 is sealed at the communicating port of the base pipe 3371 and the sleeve pipe 3372, the sample test tube 36 is inserted into the inside of the base pipe 3371, the outer surface of the sample test tube 36 is fixedly connected with a sealing ring 3375, the sealing ring 3375 covers the gap between the sleeve pipe 3372 and the sample test tube 36, a piercing cone 3376 is fixedly connected to the inside bottom of the sleeve pipe 3372, a plurality of leak holes 3377 are annularly and equidistantly formed on the outer surface of the piercing cone 3376, the leak holes 3377 penetrate through the piercing cone 3376, the end of the piercing cone 3376 pierces a to-be-pierced adhesive film 3378, during the application of the device, when the conveying assembly 33 works, the driving assembly 35 drives the connecting shaft 336 to rotate, the connecting shaft 336 transmits torque to the rotating shaft 334 through the non-contact magnetic coupling 335, and then drives the suction spiral driving blade 333 in the suction pipe 332 to rotate, forming a negative pressure in the suction pipe 332, after the sample test tube 36 is inserted into the sleeve pipe 3372 by the carrying assembly 34, the sealing ring 3375 on the outer surface of the test tube seals the gap between the sleeve pipe 3372 and the test tube, the piercing cone 3376 at the inside bottom of the sleeve pipe 3372 pierces the to-be-pierced adhesive film 3378 at the bottom of the sample test tube 36, so that the sample solution can flow out, at this time, the negative pressure in the suction pipe 332 is greater than the pressure of the telescopic spring 3374 on the sealing plate 3373, which overcomes the spring resistance to drive the sealing plate 3373 to rotate, opens the communicating port of the base pipe 3371 and the sleeve pipe 3372, and the sample solution enters the base pipe 3371 through the leak holes 3377 on the piercing cone 3376 under the action of the negative pressure, and then is conveyed to the bottom connecting pipe through the suction pipe 332, and finally flows into the ultrasonic atomizer 31, after the sample is added, the driving assembly 35 stops running, the suction spiral driving blade 333 no longer rotates,The negative pressure in the suction pipe 332 disappears, the expansion spring 3374 restores the deformation, pushes the sealing plate 3373 to flip over, re-seals the communication port of the base pipe 3371 and the sleeve pipe 3372, prevents residual sample leakage or foreign matter from entering, and prepares for the next sample injection.

[0020] Please refer to Figures 1-7 The driving 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 is fixedly installed with a large pulley 353 penetrating through the fixed plate 32, the small pulley 352 is fixedly connected to the outer surface of the lower end of the rotating shaft 334, the large pulley 353 and the small pulley 352 are drivingly connected through a transmission belt 355, the top of the large pulley 353 is fixedly connected with a rotating disc 354, the conveying assembly 34 is fixedly installed on the outer surface of the rotating disc 354 in a ring shape at equal intervals, the conveying assembly 34 includes a horizontal moving group 341, the horizontal moving group 341 is fixedly connected to the outer surface of the rotating disc 354 in a ring shape at equal intervals, the moving end of the horizontal moving group 341 is fixedly connected with a vertical moving group 342 at the top, the vertical moving group 342 is fixedly connected with a clamping group 343 at the outer side, the sample test tube 36 is clamped in the interior of the clamping group 343, during the operation of the device, the conveying assembly 33 operates under the power support of the driving assembly 35, the driving assembly 35 drives the connecting shaft 336 to rotate, the torque is transmitted to the rotating shaft 334 through the non-contact magnetic coupling 335, and then the high-speed rotation of the suction and delivery spiral driving blade 333 in the suction pipe 332 is driven, and a negative pressure environment is formed in the suction pipe 332. When the conveying assembly 34 accurately inserts the sample test tube 36 into the sleeve pipe 3372, the sealing ring 3375 on the outer surface of the test tube closely fits the inner wall of the sleeve pipe 3372, and the gap between them is sealed. At the same time, the piercing cone 3376 at the bottom of the sleeve pipe 3372 pierces the to-be-pierced film 3378 at the bottom of the sample test tube 36, and the outflow channel of the sample solution is opened. At this time, the negative pressure generated in the suction pipe 332 is greater than the pressure of the expansion spring 3374 acting on the sealing plate 3373, the negative pressure drives the sealing plate 3373 to rotate against the spring resistance, thereby opening the communication port of the base pipe 3371 and the sleeve pipe 3372. Under the action of the negative pressure suction force, the sample solution flows into the base pipe 3371 through the evenly distributed leakage holes 3377 on the piercing cone 3376, and then is conveyed to the ultrasonic atomizer 31 through the suction pipe 332 and the bottom connecting pipe. After the sample injection process is completed, the driving assembly 35 stops working, the suction and delivery spiral driving blade 333 loses power and no longer rotates, the negative pressure in the suction pipe 332 disappears, the expansion spring 3374 restores the initial deformation, and the sealing plate 3373 is flipped and reset to re-seal the communication port of the base pipe 3371 and the sleeve pipe 3372. This can not only avoid leakage and pollution of residual samples, but also prevent foreign matter from entering, and prepare for the next sample injection process, ensuring the sealing and continuity of the conveying process.

[0021] Please refer toFigures 3-7 The horizontal moving group 341 comprises side rails 3411 fixedly arranged in a ring shape at equal intervals on the outside of the rotating disc 354, the inner side of the side rails 3411 is fixedly installed with a second motor 3412, the output end of the second motor 3412 is fixedly connected with a horizontal lead screw 3413, the horizontal lead screw 3413 is rotationally connected to the inside of the side rails 3411, the outer surface of the horizontal lead screw 3413 is threadedly connected with a sliding block 3414, the sliding block 3414 is slidingly connected to the inside of the side rails 3411, the top of the sliding block 3414 is connected with the bottom of the vertical moving group 342, the vertical moving group 342 comprises vertical rails 3421 fixedly connected to the top of the sliding block 3414, the outer side of the vertical rails 3421 is fixedly installed with an electric push rod 3422, the output end of the electric push rod 3422 is fixedly connected with a top frame 3423, the outer end of the top frame 3423 is fixedly connected with a movable rod 3424, the movable rod 3424 is slidingly connected to the inside of the vertical rails 3421, the clamping group 343 is fixedly connected to the outer middle part of the movable rod 3424, during the application of the device, the horizontal moving group 341 cooperates with the vertical moving group 342 to realize the accurate positioning of the sample test tube 36, when it is needed to move the sample test tube 36, the second motor 3412 in the horizontal moving group 341 is started to drive the horizontal lead screw 3413 to rotate in the side rails 3411, since the sliding block 3414 is threadedly connected with the horizontal lead screw 3413, when the lead screw rotates, the sliding block 3414 is driven by the threaded transmission to slide horizontally along the inside track of the side rails 3411, thereby driving the vertical moving group 342 connected to the top of the sliding block 3414 to move horizontally, when it is moved horizontally to the target position, the vertical moving group 342 starts to work, the electric push rod 3422 is started, the output end of the electric push rod 3422 drives the top frame 3423 to move, the top frame 3423 drives the movable rod 3424 to slide in the vertical rails 3421 in the vertical direction, since the clamping group 343 is fixedly connected to the outer middle part of the movable rod 3424, the lifting of the movable rod 3424 can drive the clamping group 343 and the sample test tube 36 in the clamping group 343 to move up and down, realizing the position adjustment of the sample test tube 36 in the vertical direction, through the horizontal sliding of the horizontal moving group 341 and the vertical lifting of the vertical moving group 342, the sample test tube 36 can be accurately moved to the specified position, meeting the needs of the sample feeding device for accurately positioning and taking and placing the sample test tube 36.

[0022] Please refer to Figures 1-7The clamping group 343 comprises a rail frame 3431 fixedly installed at the outer middle part of the movable rod 3424, one end of the rail frame 3431 is fixedly installed with a third motor 3432, the output end of the third motor 3432 is fixedly connected with a bidirectional screw rod 3433 penetrating through the rail frame 3431, the outer surfaces of both ends of the bidirectional screw rod 3433 are oppositely threaded, both ends of the bidirectional screw rod 3433 are threadedly connected with movable blocks 3434, the outer side of each movable block 3434 is fixedly connected with a clamping arm 3435, the outer end of the clamping arm 3435 is fixedly connected with a clamping plate 3436, the sample test tube 36 is clamped on the inner side of the clamping plate 3436, the plan view of the clamping plate 3436 is in V-shaped arrangement, the overall cross-sectional shape of the movable block 3434 and the sliding block 3414 is in convex-shaped arrangement, the internal cavities of the vertical rail 3421 and the internal cavities of the side rail 3411 are also in convex-shaped arrangement, during the application of the device, when the clamping group 343 works, the third motor 3432 is started to drive the bidirectional screw rod 3433 to rotate, because the thread directions of both ends of the bidirectional screw rod 3433 are opposite, the movable blocks 3434 threadedly connected with both ends of the screw rod will move towards or away from each other according to the rotation direction of the screw rod, when it is needed to clamp the sample test tube 36, the third motor 3432 drives the bidirectional screw rod 3433 to rotate, so that the two movable blocks 3434 move towards each other, drive the clamping arms 3435 fixedly installed on the outer side of the movable blocks 3434 to move inward, and then the V-shaped clamping plate 3436 at the outer end of the clamping arm 3435 clamps the sample test tube 36, the V-shaped clamping plate 3436 is designed to better fit the circular profile of the test tube, providing stable and uniform clamping force, ensuring that the sample test tube 36 is firmly fixed, when it is needed to release the sample test tube 36, the third motor 3432 reversely drives the bidirectional screw rod 3433, so that the movable blocks 3434 move away from each other, the clamping arms 3435 and the clamping plate 3436 move outward and loosen the sample test tube 36, in addition, the movable blocks 3434, the sliding block 3414, the vertical rail 3421 and the side rail 3411 are all designed in convex-shaped cross section, this structure can effectively prevent the movable blocks 3434 from derailing or shaking when sliding in the rail frame 3431 and the sliding block 3414 moving in the side rail 3411 and the vertical rail 3421, ensuring the stability and precision of the clamping group 343 during clamping and transferring the sample test tube 36.

[0023] The implementation principle of the sample inlet device of the inductively coupled plasma mass spectrometer provided in the embodiments of the present application is as follows: the device realizes full-process automatic operation of the sample test tube 36 through the conveying assembly 34. In the specific operation process, the operator first places the sample test tube 36 between the two V-shaped clamping plates 3436 of the clamping assembly 343, and then starts the third motor 3432. After the third motor 3432 is operated, the bidirectional screw rod 3433 connected to the third motor 3432 is driven to rotate. Because the threads at the two ends of the bidirectional screw rod 3433 are designed to have opposite rotation directions, the two movable blocks 3434 connected to the threads of the screw rod can move in opposite directions. The movement of the movable blocks 3434 drives the clamping arms 3435 fixed thereon to move inward synchronously, so that the clamping plates 3436 clamp the sample test tube 36, and the accurate positioning of the sample test tube 36 is realized. After the clamping and positioning are completed, the second motor 3412 is started. When the second motor 3412 is operated, the transverse screw rod 3413 is driven to rotate. The sliding block 3414 connected to the transverse screw rod 3413 slides horizontally in the side rail 3411, so that the clamping assembly 343 and the sample test tube 36 clamped thereon are moved to the upper side of the sleeve 3372. At this time, the electric push rod 3422 is started, the electric push rod 3422 pushes the top frame 3423, the top frame 3423 drives the movable rod 3424 to move downward, so that the sample test tube 36 can be smoothly inserted into the sleeve 3372. During the insertion process, the to-be-pierced film 3378 at the bottom of the test tube is pierced by the piercing cone 3376 at the bottom of the sleeve 3372, and the sample solution can communicate with the outside through the evenly distributed leakage holes 3377 on the piercing cone 3376, so as to prepare for the subsequent sample extraction. After the sample inlet process is completed, the operator can start the third motor 3432 and the second motor 3412 to rotate reversely, so that the conveying assembly 34 moves reversely, and the sample test tube 36 is smoothly moved out of the sleeve 3372, so as to prepare for the next sample taking and placing operation. This design enables the device to realize the functions of automatic taking and placing of the sample test tube 36, and ensures the continuity and efficiency of the automatic sample inlet process. In actual application, the carrying assembly 34 adopts a three-dimensional motion design of the horizontal moving group 341, the longitudinal moving group 342 and the clamping group 343, cooperates with the track of the convex-shaped movable block 3434, and ensures the stability of the sample test tube 36 in the carrying process from the mechanical structure layer. In the motion process, the convex-shaped movable block 3434 is closely matched with the track, effectively limits the shaking and deviation of the movable block 3434, so that the sample test tube 36 remains stable and does not shake in the carrying process, greatly reduces the positioning error. At the same time, the first motor 351 drives the rotating disc 354 to rotate, so that multiple carrying assemblies 34 can sequentially transport the sample test tube 36 to the sleeve 3372, realize the continuous and orderly delivery of the sample. Compared with the traditional manual placement of the sample or the single-sample one-by-one carrying mode, the design greatly improves the sample carrying efficiency, effectively reduces the errors that may occur in the manual operation process. In addition, the top and bottom of the sample test tube 36 are provided with the threaded sealing cover 37 and the threaded bottom cover 38, which are connected in a threaded manner. This connection mode enables the sample test tube 36 to be easily disassembled and cleaned after use, realizes repeated use, and thus reduces the overall use cost of the equipment; The design of the sample injection mechanism 3 realizes the automatic continuous injection of the sample and the efficient use of the power. When the sample test tube 36 is inserted into the sleeve 3372, the sample solution obtains a flow-out channel after the rubber film 3378 is pierced. When the first motor 351 drives the rotating disc 354 to drive the carrying assembly 34 to work, the 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 mechanical transmission principle, this structure can efficiently amplify the power. The small pulley 352 drives the connecting shaft 336 to rotate after obtaining the amplified power, and then drives the rotating shaft 334 to rotate through the non-contact magnetic coupling 335, and then drives the high-speed rotation of the pumping screw drive blade 333. The pumping and suction effect generated by the rotation of the pumping screw drive blade 333 forms a negative pressure environment in the base pipe 3371. Under the action of the negative pressure, the blocking plate 3373 overcomes the elastic force of the expansion spring 3374 to rotate, opens the communication channel between the base pipe 3371 and the sleeve 3372, and the sample solution is driven by the negative pressure to enter the suction pipe 332 through the leakage hole 3377, and then is transported to the ultrasonic atomizer 31 through the connecting pipe, and finally completes the sample injection process. After the sample injection is completed, the first motor 351 stops running, the pumping screw drive blade 333 loses the power source, the negative pressure in the pumping tube 332 disappears, at this time, the stretch spring 3374 restores the deformation, pushes the sealing plate 3373 to turn and move up, reseals the bottom of the base tube 3371, effectively prevents the sample residue or external pollutants from entering, ensures the cleaning and sealing performance of the sample injection system. The sample injection mechanism 3 does not need to additionally configure a delivery pump, and the power required for sample transportation is used twice to convert into the power of sample pumping. This design simplifies the equipment structure, reduces the number of equipment components and energy consumption, thereby reducing the equipment cost. At the same time, the automatic continuous sample injection process significantly improves the sample injection efficiency compared with the traditional single sample injection mode, reduces the sample waiting time, improves the overall detection throughput of the mass spectrometer, and facilitates the adaptation of large-scale sample injection detection.

[0024] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A sample injection device for an inductively coupled plasma mass spectrometer, characterized in that: It comprises a base plate (1), an inductively coupled plasma mass spectrometer body (2) is fixedly mounted on the top of the base plate (1), and a sample injection mechanism (3) is fixedly mounted on one side of the inductively coupled plasma mass spectrometer body (2); The sample introduction mechanism (3) includes an ultrasonic atomizer (31) and a fixed plate (32), wherein the ultrasonic atomizer (31) is fixedly mounted on an upper end of one side of the inductively coupled plasma mass spectrometer body (2), and the fixed plate (32) is fixedly mounted on a side of the top of the inductively coupled plasma mass spectrometer body (2). A conveying assembly (33) is fixedly mounted on the top rear side of the fixed plate (32), and the output end of the conveying assembly (33) is connected to the input end of the ultrasonic atomizer (31), and the output end of the ultrasonic atomizer (31) is connected to the interior of the inductively coupled plasma mass spectrometer body (2). A driving assembly (35) is fixedly mounted on the top of the fixed plate (32), the rear side of the driving assembly (35) is in transmission connection with the conveying assembly (33), the top front end of the driving assembly (35) is fixedly connected with a transport assembly (34) arranged in a ring shape at equal intervals, the inner side of the transport assembly (34) holds a sample test tube (36), the top of the sample test tube (36) is threadedly connected to a threaded sealing cover (37), the bottom output end of the sample test tube (36) is threadedly connected to a threaded bottom cover (38), and the inner middle of the threaded bottom cover (38) is fixedly connected to a film to be punctured (3378).

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

3. The sample injection device for an inductively coupled plasma mass spectrometer according to claim 2, wherein: The self-sealing connection group (337) includes a base tube (3371), the base tube (3371) is fixedly connected to the top of the suction tube (332), the top of the base tube (3371) is fixedly connected to the sleeve (3372), the sample test tube (36) is inserted into the interior of the sleeve (3372), one side of the interior of the base tube (3371) is rotatably connected to a blocking plate (3373), the bottom of the blocking plate (3373) is fixedly connected to a telescopic spring (3374), the bottom end of the telescopic spring (3374) is fixedly connected to a side of the base tube (3371) near the hinge of the blocking plate (3373), and the blocking plate (3373) blocks the connecting port between the base tube (3371) and the sleeve (3372).

4. The sample injection device for an inductively coupled plasma mass spectrometer according to claim 3, wherein: The sample tube (36) is inserted into the interior of the base tube (3371), and a sealing ring (3375) is fixedly connected to the outer surface of the sample tube (36), and the sealing ring (3375) covers the gap between the sleeve (3372) and the sample tube (36). A puncture cone (3376) is fixedly connected to the bottom of the sleeve (3372), and the outer surface of the puncture cone (3376) is provided with leakage holes (3377) in a ring shape at equal intervals, and the leakage holes (3377) penetrate the puncture cone (3376), and the end of the puncture cone (3376) punctures the film to be punctured (3378).

5. The sample injection device for an inductively coupled plasma mass spectrometer according to claim 2, wherein: The driving assembly (35) comprises a first motor (351) and a small pulley (352), wherein the first motor (351) is fixedly mounted on 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 mounted 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 to each other by a transmission belt (355), the top of the large pulley (353) is fixedly connected to a turntable (354), and the transporting assemblies (34) are arranged in a ring shape at equal intervals and are fixedly mounted on the outer surface of the turntable (354).

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

7. The sample injection device for an inductively coupled plasma mass spectrometer according to claim 6, characterized in that: The transverse shift group (341) includes side rails (3411), which are arranged in a ring shape at equal intervals and fixedly installed on the outside of the turntable (354), and a second motor (3412) is fixedly installed on the inside of the side rails (3411). The output end of the second motor (3412) is fixedly connected to a transverse screw rod (3413), and the transverse screw rod (3413) is rotatably connected to the inside of the side rails (3411). The outer surface of the transverse screw rod (3413) is threadedly connected to a sliding block (3414), and 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 shift group (342).

8. The sample injection device for an inductively coupled plasma mass spectrometer according to claim 7, wherein: The longitudinal movement group (342) includes a vertical rail (3421), the vertical rail (3421) 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), the output end of the electric push rod (3422) is fixedly connected to the top frame (3423), the outer end of the top frame (3423) is fixedly connected to the movable rod (3424), the movable rod (3424) is slidably connected to the inside of the vertical rail (3421), and the clamping group (343) is fixedly connected to the middle part of the outer side of the movable rod (3424).

9. The sample injection device for an inductively coupled plasma mass spectrometer according to claim 8, characterized in that: The clamping group (343) includes a rail frame (3431), the rail frame (3431) is fixedly installed on the middle part of the outer side of the movable rod (3424), one end of the rail frame (3431) is fixedly installed with a third motor (3432), the output end of the third motor (3432) passes through the rail frame (3431) and is fixedly connected with a bidirectional screw rod (3433), the two ends of the outer surface of the bidirectional screw rod (3433) have opposite screw threads, the two ends of the bidirectional screw rod (3433) are threadedly connected with a movable block (3434), the outer side of the movable block (3434) is fixedly connected with a clamping arm (3435), the outer end of the clamping arm (3435) is fixedly connected with a clamping plate (3436), and the sample tube (36) is clamped on the inner side of the clamping plate (3436).

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

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