Sample introduction device of plasma mass spectrometer

Abstract

The utility model provides a sample introduction device of a plasma mass spectrometer, which belongs to the technical field of sample introduction devices and comprises a mass spectrometer, a fixed table and an adjusting table, the fixed table and the adjusting table are arranged on the mass spectrometer, and a pump body is mounted at a sample introduction port of the mass spectrometer. According to the sample tube replacement device, the second sector gear is matched with the gear ring, so that the fixed shaft drives the mounting table above the fixed shaft to rotate so as to replace the sample tube, and the fixed shaft rotates 60 degrees every time the driving shaft rotates by a circle, so that the sample tube is convenient to replace; an ejector rod is matched with a spring to slide out of an insertion groove to eject a sample pipe above, so that a fixed pipe extends into the sample pipe, a sample is conveniently and automatically sampled, a first sector gear rotated by a driving shaft by 90 degrees is matched with a rack to enable the ejector rod to slide downwards into a sliding groove, and the sample pipe is put down to expose the fixed pipe in a pipe body; the fixed pipe and the sample pipe are automatically separated, so that the sample pipe is conveniently replaced by subsequent rotation, different samples are directly sampled, and the sample injection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sample injection devices, in particular to a sample injection device for a plasma mass spectrometer. Background Art

[0002] Plasma mass spectrometer is an analytical instrument used in the fields of environmental science and technology and resource science and technology. It is an instrument for determining ultra-trace elements and isotope ratios. It consists of a plasma generator, atomization chamber, torch, quadrupole mass spectrometer and a fast-channel electron multiplier tube (called an ion detector or collector). Its working principle is: the atomizer sends the solution sample into the plasma light source, vaporizes at high temperature, dissociates the ionized gas, and the ions collected by the copper or nickel sampling cone form a molecular beam under a low vacuum pressure of about 133.322 Pa, and then enters the quadrupole mass spectrometer through a 1-2 mm diameter interceptor plate. After mass separation by the mass filter, it reaches the ion detector. According to the proportional relationship between the detector count and concentration, the element content or isotope ratio can be measured. The solution sample is generally sucked into the body by a special injection needle and then atomized by the atomizer.

[0003] In the prior art, when traditional sampling devices are used to sample different samples, the sample tubes need to be replaced manually in order to continuously test different samples. It is difficult to achieve intermittent sampling. When performing a large number of tests, technicians are easily confused, making the sampling process time-consuming and laborious, resulting in poor sampling efficiency. How to invent a sampling device for a plasma mass spectrometer to improve these problems has become an urgent problem to be solved by technicians in this field. Utility Model Content

[0004] In order to make up for the above shortcomings, the utility model provides a sampling device for a plasma mass spectrometer, aiming to improve the problem of poor sampling efficiency of traditional sampling devices.

[0005] The utility model is achieved in this way:

[0006] The utility model provides a sample injection device for a plasma mass spectrometer, comprising a mass spectrometer and a fixing platform and an adjusting platform arranged on the mass spectrometer, wherein a pump body is installed at the sample injection port of the mass spectrometer, a fixing tube is installed at the input end of the pump body, and a fixing frame fixedly connected to the mass spectrometer is fixedly connected to the outer wall of the fixing tube;

[0007] The fixing table is provided with a mounting groove inside, a motor is installed on the inner wall of the mounting groove, a fixing block and an ear plate are fixedly connected to the upper outer wall of the fixing table respectively, a double-headed bevel gear is installed on the inner wall of the fixing block, a rotating shaft is rotatably connected to the inner wall of the ear plate, one end of the rotating shaft is fixedly connected to the first driven bevel gear, the outer wall of the rotating shaft is fixedly connected to the first sector gear, the inner wall of the fixing table is rotatably connected to the driving shaft, the upper end of the driving shaft is fixedly connected to the second driven bevel gear, and the outer wall of the driving shaft is fixedly connected to the second sector gear;

[0008] The inner wall of the adjusting platform is fixedly connected to a fixed shaft rotatably connected to the inner wall of the fixed platform, the outer wall of the fixed shaft is fixedly connected to a gear ring meshing with the second sector gear, the upper end of the fixed shaft is fixedly connected to a mounting platform, and the inner wall of the mounting platform is installed with six equidistant sample tubes, one of which is located directly below the fixed tube.

[0009] Preferably, the output end of the motor is fixedly connected to one end of the drive shaft, the gear ratio of the second sector gear and the ring gear is one to six, the second sector gear is a 270-degree ring gear, and the output end of the pump body is connected to the inlet of the mass spectrometer.

[0010] By adopting the above technical solution, the motor is started to rotate the driving shaft, and the second sector gear on the outside of the driving shaft cooperates with the gear ring on the outside of the fixed shaft to make the upper adjustment table and the mounting table drive the upper sample tube to rotate. For every rotation of the driving shaft, the fixed shaft on one side drives the upper fixed frame to rotate sixty degrees, so that the sample tube close to the fixed tube can be replaced automatically.

[0011] Preferably, the outer wall of the double-headed bevel gear is rotatably connected to the inner wall of the fixed block, one end of the double-headed bevel gear is meshingly connected to the first driven bevel gear, and the other end of the double-headed bevel gear is meshingly connected to the second driven bevel gear, and the outer wall of the rotating shaft is fixedly connected to a first sector gear, and the first sector gear is a ninety-degree ring gear.

[0012] Preferably, a slide groove is provided at the bottom end of the adjustment platform, six equally spaced slots are provided on the inner wall of the slide groove, and a plurality of rolling-connected balls are installed on the inner wall of the slide groove.

[0013] Preferably, a guide groove is opened on one side of the fixed platform, the inner wall of the guide groove is slidably connected with a push rod, the outer wall of the push rod is slidably connected to the inner wall of the slot, the outer wall of the push rod is fixedly connected with a fixing sleeve, and the inner wall of the fixing sleeve is fixedly connected with a spring.

[0014] Preferably, a rack meshingly connected to the first sector gear is fixedly connected to an outer wall of one side of the fixing sleeve.

[0015] By adopting the above technical solution, when the driving shaft rotates to drive the second sector gear to rotate the fixed shaft, when the second sector gear is out of contact with the gear ring, the push rod rebounds and slides upward under the action of the spring, lifting the sample tube above so that one end of the fixed tube extends into the sample tube for sampling. The driving shaft continues to rotate the second driven bevel gear at its upper end to cooperate with the double-headed bevel gear and the first driven bevel gear, so that the rotating shaft drives the first sector gear to rotate and mesh with the rack to make the fixed sleeve slide down and drive the push rod to slide down into the slide groove. When the first sector gear and the rack are disengaged, the second sector gear and the gear ring are meshed to make the adjusting table rotate. At the same time, the push rod rebounds and the ball on its top and the inner wall of the slide groove is pressed against to slide along the slide groove. After that, the driving shaft rotates and repeats the above operation, automatically completing the sampling of different samples and improving the efficiency of sampling.

[0016] The beneficial effects of the utility model are:

[0017] The second sector gear is arranged to cooperate with the gear ring to make the fixed shaft drive the mounting platform above to rotate so as to replace the sample tube. The fixed shaft rotates sixty degrees for every rotation of the driving shaft. At the same time, the mounting platform stops rotating after the driving shaft rotates for ninety degrees, so as to facilitate the replacement of the sample tube. At this time, the ejector rod cooperates with the spring to slide out of the slot to lift the sample tube above so that the fixed tube extends into the sample tube, which is convenient for automatic sampling of the sample. At the same time, after the driving shaft rotates for ninety degrees, the first sector gear cooperates with the rack to make the ejector rod slide down into the slide groove, lower the sample tube to expose the fixed tube inside the tube body, and automatically disengage the fixed tube and the sample tube for subsequent rotation to replace the sample tube, thereby directly sampling different samples and improving the efficiency of sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of a sample injection device of a plasma mass spectrometer provided by an embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of the partial structure of a sampling device of a plasma mass spectrometer provided by an embodiment of the utility model;

[0021] Figure 3 It is a front view half-section diagram of the local structure of a sampling device of a plasma mass spectrometer provided by an embodiment of the utility model;

[0022] Figure 4 It is a side half-section view of the local structure of a sample injection device of a plasma mass spectrometer provided by an embodiment of the utility model;

[0023] Figure 5 It is a top view of the partial structure of a sampling device of a plasma mass spectrometer provided by an embodiment of the utility model.

[0024] In the figure: 1. fixed table; 2. mounting groove; 3. motor; 4. fixed block; 5. double-headed bevel gear; 6. ear plate; 7. rotating shaft; 8. first driven bevel gear; 9. first sector gear; 10. driving shaft; 11. second driven bevel gear; 12. second sector gear; 13. guide groove; 14. spring; 15. fixed sleeve; 16. rack; 17. push rod; 18. fixed shaft; 19. gear ring; 20. adjustment table; 21. slide groove; 22. slot; 23. ball bearing; 24. mounting table; 25. sample tube; 26. mass spectrometer; 27. pump body; 28. fixed frame; 29. ​​fixed tube. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the implementation of the utility model clearer, the technical solution in the implementation of the utility model will be clearly and completely described below in conjunction with the drawings in the implementation of the utility model. Obviously, the described implementation is a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Example, see Figure 1-Figure 5 A sampling device for a plasma mass spectrometer comprises a mass spectrometer 26 and a fixing table 1 and an adjusting table 20 arranged on the mass spectrometer 26, a pump body 27 is installed at the sampling port of the mass spectrometer 26, a fixing pipe 29 is installed at the input end of the pump body 27, and a fixing frame 28 fixedly connected to the mass spectrometer 26 is fixedly connected to the outer wall of the fixing pipe 29;

[0027] A mounting groove 2 is provided inside the fixed platform 1, and a motor 3 is installed on the inner wall of the mounting groove 2. A fixing block 4 and an ear plate 6 are fixedly connected to the upper outer wall of the fixed platform 1, respectively. A double-headed bevel gear 5 is installed on the inner wall of the fixing block 4. A rotating shaft 7 is rotatably connected to the inner wall of the ear plate 6. A first driven bevel gear 8 is fixedly connected to one end of the rotating shaft 7. A first sector gear 9 is fixedly connected to the outer wall of the rotating shaft 7. A driving shaft 10 is rotatably connected to the inner wall of the fixed platform 1. A second driven bevel gear 11 is fixedly connected to the upper end of the driving shaft 10, and a second sector gear 12 is fixedly connected to the outer wall of the driving shaft 10.

[0028] The inner wall of the adjustment platform 20 is fixedly connected to a fixed shaft 18 rotatably connected to the inner wall of the fixed platform 1, the outer wall of the fixed shaft 18 is fixedly connected to a gear ring 19 meshing with the second sector gear 12, the upper end of the fixed shaft 18 is fixedly connected to a mounting platform 24, and the inner wall of the mounting platform 24 is installed with six equidistant sample tubes 25, one of the sample tubes 25 is located directly below the fixed tube 29.

[0029] Further; the output end of the motor 3 is fixedly connected to one end of the drive shaft 10, the gear ratio of the second sector gear 12 and the ring gear 19 is one to six, the second sector gear 12 is a 270-degree ring gear, the output end of the pump body 27 is connected to the inlet of the mass spectrometer 26.

[0030] It should be noted that: starting the motor 3 causes the driving shaft 10 to rotate, and the second sector gear 12 on the outside of the driving shaft 10 cooperates with the outer gear ring 19 of the fixed shaft 18 to make the upper adjustment platform 20 and the mounting platform 24 drive the upper sample tube 25 to rotate. For every rotation of the driving shaft 10, the fixed shaft 18 on one side drives the upper fixed frame 28 to rotate sixty degrees, so that the sample tube 25 close to the fixed tube 29 can be automatically replaced.

[0031] Further, the outer wall of the double-headed bevel gear 5 is rotatably connected to the inner wall of the fixed block 4, one end of the double-headed bevel gear 5 is meshed with the first driven bevel gear 8, and the other end of the double-headed bevel gear 5 is meshed with the second driven bevel gear 11. The outer wall of the rotating shaft 7 is fixedly connected with the first sector gear 9, and the first sector gear 9 is a ninety-degree ring gear. A slide groove 21 is provided at the bottom end of the adjusting platform 20, and six equidistant slots 22 are provided on the inner wall of the slide groove 21. A plurality of rolling balls 23 are installed on the inner wall of the slide groove 21. A guide groove 13 is provided on one side of the fixed platform 1, and a push rod 17 is slidably connected to the inner wall of the guide groove 13. The outer wall of the push rod 17 is slidably connected to the inner wall of the slot 22, and the outer wall of the push rod 17 is fixedly connected to the fixed sleeve 15, and the inner wall of the fixed sleeve 15 is fixedly connected to the spring 14. The outer wall of one side of the fixed sleeve 15 is fixedly connected to the rack 16 meshed with the first sector gear 9.

[0032] It should be noted that: when the driving shaft 10 rotates to drive the second sector gear 12 to rotate the fixed shaft 18, when the second sector gear 12 is out of contact with the ring gear 19, the slot 22 on the adjustment platform 20 is aligned with the push rod 17, and the push rod 17 rebounds and slides upward under the action of the spring 14 to lift the sample tube 25 above so that one end of the fixed tube 29 extends into the sample tube 25 for sampling, and the driving shaft 10 continues to rotate the second driven bevel gear 11 at its upper end to cooperate with the double-headed bevel gear 5 and the first driven bevel gear 8, so that the rotating shaft 7 drives the first sector gear 12 to rotate. The gear 9 rotates and meshes with the rack 16 to make the fixed sleeve 15 slide down and drive the push rod 17 to slide down into the slide groove 21. When the first sector gear 9 and the rack 16 are disengaged, the second sector gear 12 and the gear ring 19 mesh to make the adjustment table 20 rotate. At the same time, the push rod 17 rebounds and the ball 23 on the top end and the inner wall of the slide groove 21 resist and slide along the slide groove 21. Then the driving shaft 10 rotates and repeats the above operation, automatically completing the replacement of different sample tubes 25, so as to directly sample different samples and improve the efficiency of subsequent sampling.

[0033] The working principle of the sample injection device of a plasma mass spectrometer:

[0034] The motor 3 is started to rotate the driving shaft 10. The second sector gear 12 on the outside of the driving shaft 10 cooperates with the outer gear ring 19 of the fixed shaft 18 to make the upper adjustment platform 20 and the mounting platform 24 drive the upper sample tube 25 to rotate. For each rotation of the driving shaft 10, the fixed shaft 18 on one side drives the upper fixed frame 28 to rotate sixty degrees. When the driving shaft 10 rotates to drive the second sector gear 12 to rotate the fixed shaft 18, when the second sector gear 12 is out of contact with the gear ring 19, the slot 22 on the adjusting platform 20 is aligned with the ejector rod 17. The ejector rod 17 rebounds and slides upward under the action of the spring 14 to lift the upper sample tube 25 so that one end of the fixed tube 29 extends into the sample tube 25 for sampling. , the driving shaft 10 continues to rotate the second driven bevel gear 11 at its upper end to cooperate with the double-headed bevel gear 5 and the first driven bevel gear 8, so that the rotating shaft 7 drives the first sector gear 9 to rotate and mesh with the rack 16 to make the fixed sleeve 15 slide down and drive the push rod 17 to slide down into the slide groove 21. When the first sector gear 9 and the rack 16 are disengaged, the second sector gear 12 and the gear ring 19 are meshed to make the adjustment table 20 rotate. At the same time, the push rod 17 rebounds and the ball 23 on the top end and the inner wall of the slide groove 21 resists and slides along the slide groove 21. After that, the driving shaft 10 rotates and repeats the above operation, automatically completing the replacement of different sample tubes 25, so as to directly sample different samples and improve the efficiency of subsequent sampling.

[0035] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0036] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sample injection device for a plasma mass spectrometer, comprising a mass spectrometer (26) and a fixing table (1) and an adjustment table (20) arranged on the mass spectrometer (26), characterized in that: The inlet of the mass spectrometer (26) is equipped with a pump body (27), the input end of the pump body (27) is equipped with a fixed tube (29), and the outer wall of the fixed tube (29) is fixedly connected to a fixed frame (28) fixedly connected to the mass spectrometer (26); The fixing platform (1) is provided with a mounting groove (2) inside, and a motor (3) is installed on the inner wall of the mounting groove (2); the upper outer wall of the fixing platform (1) is respectively fixedly connected with a fixing block (4) and an ear plate (6); the inner wall of the fixing block (4) is installed with a double-headed bevel gear (5); the inner wall of the ear plate (6) is rotatably connected with a rotating shaft (7); one end of the rotating shaft (7) is fixedly connected with a first driven bevel gear (8); the outer wall of the rotating shaft (7) is fixedly connected with a first sector gear (9); the inner wall of the fixing platform (1) is rotatably connected with a driving shaft (10); the upper end of the driving shaft (10) is fixedly connected with a second driven bevel gear (11); and the outer wall of the driving shaft (10) is fixedly connected with a second sector gear (12); The inner wall of the adjustment platform (20) is fixedly connected to a fixed shaft (18) rotatably connected to the inner wall of the fixed platform (1); the outer wall of the fixed shaft (18) is fixedly connected to a gear ring (19) meshingly connected to the second sector gear (12); the upper end of the fixed shaft (18) is fixedly connected to a mounting platform (24); the inner wall of the mounting platform (24) is mounted with six equidistant sample tubes (25), one of which is located directly below the fixed tube (29).

2. The sampling device of a plasma mass spectrometer according to claim 1, characterized in that: The output end of the motor (3) is fixedly connected to one end of the drive shaft (10); the gear ratio of the second sector gear (12) and the ring gear (19) is one to six; the second sector gear (12) is a 270-degree ring gear.

3. The sampling device of a plasma mass spectrometer according to claim 1, characterized in that: The outer wall of the double-headed bevel gear (5) is rotatably connected to the inner wall of the fixed block (4); one end of the double-headed bevel gear (5) is meshingly connected to the first driven bevel gear (8); the other end of the double-headed bevel gear (5) is meshingly connected to the second driven bevel gear (11); the outer wall of the rotating shaft (7) is fixedly connected to a first sector gear (9); the first sector gear (9) is a ninety-degree ring gear.

4. The sampling device of a plasma mass spectrometer according to claim 3, characterized in that: A slide groove (21) is provided at the bottom end of the adjustment platform (20), six slots (22) are provided at equal intervals on the inner wall of the slide groove (21), and a plurality of rolling balls (23) are installed on the inner wall of the slide groove (21).

5. The sample injection device of a plasma mass spectrometer according to claim 4, characterized in that: A guide groove (13) is provided on one side of the fixed platform (1), the inner wall of the guide groove (13) is slidably connected to a push rod (17), the outer wall of the push rod (17) is slidably connected to the inner wall of the slot (22), the outer wall of the push rod (17) is fixedly connected to a fixing sleeve (15), and the inner wall of the fixing sleeve (15) is fixedly connected to a spring (14).

6. The sample injection device of a plasma mass spectrometer according to claim 5, characterized in that: A rack (16) meshingly connected to the first sector gear (9) is fixedly connected to an outer wall of one side of the fixed sleeve (15).

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