A material shaft docking device inside a graphite furnace

Abstract

The present invention discloses a material shaft docking device inside a graphite furnace, which includes a motor frame installed on the outer shell of the graphite furnace. The motor frame is bolted to the outer shell of the graphite furnace through a frame base. One end of the motor frame away from the outer shell of the graphite furnace is installed with a stepping motor. The output end of the stepping motor penetrates through the side of the motor frame and extends into its interior to be connected with a magnetic fluid seal through a star-shaped coupling. A flange plate structure is installed on the rotating shaft inside the outer shell of the graphite furnace through bolts. A turntable structure that is rotationally matched with the flange plate structure is arranged at the end of the inner material shaft of the outer shell of the graphite furnace. The beneficial effects are as follows: By the rotational cooperation between the flange plate structure installed on the outer shell of the graphite furnace and the turntable structure arranged at the end of the material shaft, the rotation of the inner material shaft of the graphite furnace is driven, with a simple and flexible structure and strong practicability.

Description

Technical Field

[0001] The present invention relates to the technical field of graphite furnaces, and particularly to a material shaft docking device inside a graphite furnace. Background Art

[0002] A graphite furnace is a non-flame atomizer, which is applied to atomic absorption spectrometry and is a widely used one in electrothermal atomizers. The essence of a graphite atomizer is a graphite resistance heater. It uses a large current to heat a high-resistance graphite tube, generating a high temperature of up to 3000 °C, melting a small amount of test solution solids therein, and free atoms can be obtained. The graphite furnace consists of three parts: a graphite tube, a furnace body, and a power supply.

[0003] In the existing docking cavity between the graphite furnace and the graphite furnace housing, there is a lack of a turntable structure that cooperates with the flange structure installed on the rotating shaft to realize the docking work of the material shaft, enabling the rotation and separation of the material shaft inside the graphite furnace. Summary of the Invention

[0004] The purpose of the present invention is to provide a material shaft docking device inside a graphite furnace. By rotatingly matching the flange structure installed on the outer housing of the graphite furnace with the turntable structure provided at the end of the material shaft, the rotation of the material shaft inside the graphite furnace is driven, with a simple and flexible structure and strong practicability.

[0005] The technical solution of the present invention is realized as follows:

[0006] A material shaft docking device inside a graphite furnace includes a motor frame installed on the outer housing of the graphite furnace. The motor frame is bolted to the outer housing of the graphite furnace through a frame base. One end of the motor frame away from the outer housing of the graphite furnace is provided with a stepping motor. The output end of the stepping motor penetrates the side of the motor frame and extends into its interior to be connected with a magnetic fluid seal through a star-shaped coupling. The magnetic fluid seal is bolted to the bearing seat on the outer housing of the graphite furnace through a mounting seat. One end of the magnetic fluid seal away from the stepping motor is connected with a rotating shaft through a coupling. One end of the rotating shaft is rotatably matched with the bearing seat installed on the outer housing of the graphite furnace, and the other end extends into the interior of the outer housing of the graphite furnace. A flange structure is installed on the rotating shaft located inside the outer housing of the graphite furnace through bolts. A turntable structure that is rotationally matched with the flange structure is provided at the end of the material shaft inside the outer housing of the graphite furnace.

[0007] Further, the flange structure includes a positioning disk. A plurality of mounting holes are evenly arranged on the surface of the positioning disk, and positioning pins are inserted through the mounting holes. Springs are sleeved on the positioning pins, and nuts are provided at the ends of the positioning pins away from the springs.

[0008] Furthermore, the turntable structure includes a turntable that cooperates with the positioning disk. A connecting sleeve that cooperates with the material shaft is provided on the turntable. A plurality of card slots are evenly arranged on the outer edge of the turntable. A connecting hole that cooperates with the rotating shaft is provided at the center of the turntable, and the connecting hole communicates with the inner cavity of the connecting sleeve.

[0009] Furthermore, the positioning pins on the positioning disk are snap-fitted with the card slots provided on the outer edge of the turntable, and the number of card slots provided on the outer edge of the turntable is the same as the number of positioning pins provided on the surface of the positioning disk.

[0010] Furthermore, one end of the rotating shaft away from the positioning disk passes through the connecting hole and cooperates with the material shaft in the connecting sleeve.

[0011] Furthermore, the central angle corresponding to the arc length between two adjacent positioning pins and two adjacent card slots is 120°.

[0012] The beneficial effect of the present invention is that when the turntable structure cooperates with the flange disk structure installed on the rotating shaft in the docking cavity between the graphite furnace and the graphite furnace housing, the turntable abuts against the surface of the positioning disk, that is, the outer ends of the positioning pins on the surface of the positioning disk abut against the surface of the turntable. Then, the stepping motor is started. The stepping motor drives the rotation of the rotating shaft through the coupling and drives the rotation of the positioning disk on the rotating shaft. During the rotation of the positioning disk, relative rotation will occur with the turntable provided at the end of the material shaft. During the relative rotation process, multiple positioning pins provided on the surface of the positioning disk will be snap-fitted and fixed with multiple card slots provided on the outer edge of the turntable, so as to realize that the rotating shaft is inserted into the inner cavity of the connecting sleeve through the connecting hole at the center of the turntable and cooperates with the material shaft to complete the docking work with the material shaft, thereby realizing the rotation of the material shaft in the graphite furnace. The structure is simple and the practicability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 It is a schematic structural diagram of a material shaft docking device in a graphite furnace;

[0015] Figure 2 It is a cross-sectional view of the flange disk structure;

[0016] Figure 3 It is a schematic diagram of the flange disk structure;

[0017] Figure 4 It is a cross-sectional view of the turntable structure;

[0018] Figure 5 It is a schematic diagram of the turntable structure.

[0019] In the figure:

[0020] 1. Stepper motor; 2. Motor frame; 3. Star coupling; 4. Magnetic fluid seal; 5. Coupling; 6. Graphite furnace outer shell; 7. Mounting seat; 8. Flange structure; 9. Rotating shaft; 10. Turntable structure; 11. Positioning sleeve; 12. Material shaft; 13. Frame base; 14. Positioning disk; 15. Positioning pin; 16. Spring; 17. Mounting hole; 18. Nut; 19. Turntable; 20. Inner cavity; 21. Connecting hole; 22. Connecting sleeve; 23. Card slot. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of simplifying the description of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0023] According to an embodiment of the present invention, a material shaft docking device inside a graphite furnace is provided.

[0024] Referring to Figures 1-5 , the material shaft docking device inside the graphite furnace according to the embodiment of the present invention includes a motor frame 2 installed on the graphite furnace outer shell 6. The motor frame 2 is bolted to the graphite furnace outer shell 6 through the frame base 13. One end of the motor frame 2 away from the graphite furnace outer shell 6 is provided with a stepper motor 1. The output end of the stepper motor 1 penetrates the side of the motor frame 2 and extends into its interior to be connected with a magnetic fluid seal 4 through a star coupling 3. The magnetic fluid seal 4 is bolted to the bearing seat on the graphite furnace outer shell 6 through a mounting seat 7. One end of the magnetic fluid seal 4 away from the stepper motor 1 is connected with a rotating shaft 9 through a coupling 5. One end of the rotating shaft 9 is rotationally matched with the bearing seat installed on the graphite furnace outer shell 6, and the other end extends into the interior of the graphite furnace outer shell 6. The rotating shaft 9 located inside the graphite furnace outer shell 6 is bolted with a flange structure 8. A turntable structure 10 that is rotationally matched with the flange structure 8 is provided at the end of the material shaft 12 inside the graphite furnace outer shell 6.

[0025] Further, the flange structure 8 includes a positioning disk 14, on the surface of which a plurality of mounting holes 17 are evenly arranged, and positioning pins 15 are inserted through the mounting holes 17. Springs 16 are sleeved on the positioning pins 15, and nuts 18 are provided at the ends of the positioning pins 15 away from the springs 16.

[0026] Further, the turntable structure 10 includes a turntable 19 that cooperates with the positioning disk 14. A connecting sleeve 22 that cooperates with the material shaft 12 is provided on the turntable 19. A plurality of card slots 23 are evenly arranged on the outer edge of the turntable 19. A connecting hole 21 that cooperates with the rotating shaft 9 is provided at the center of the turntable 19, and the connecting hole 21 communicates with the inner cavity 20 of the connecting sleeve 22.

[0027] Further, the positioning pins 15 on the positioning disk 14 are in snap-fit connection with the card slots 23 provided on the outer edge of the turntable 19, and the number of card slots 23 provided on the outer edge of the turntable 19 is the same as the number of positioning pins 15 provided on the surface of the positioning disk 14.

[0028] Further, one end of the rotating shaft 9 away from the positioning disk 14 passes through the connecting hole 21 and cooperates with the material shaft 12 inside the connecting sleeve 22.

[0029] Further, the central angle corresponding to the arc length between two adjacent positioning pins 15 and two adjacent card slots 23 is 120°.

[0030] During specific implementation, the material shaft 12 is transported into the graphite furnace through a conveying device. A material rack is installed on the material shaft 12. Under the push of the conveying device, the material shaft 12 is gradually transported to the other end of the graphite furnace, and in the docking cavity between the graphite furnace and the graphite furnace housing 6, it cooperates with the flange structure installed on the rotating shaft 9 through the turntable structure 10.

[0031] When the turntable structure 10 cooperates with the flange structure installed on the rotating shaft 9 in the docking cavity between the graphite furnace and the graphite furnace housing 6, the turntable 19 abuts against the surface of the positioning disk 15, that is, the outer ends of the positioning pins 15 on the surface of the positioning disk 14 abut against the surface of the turntable 19. Then, the stepping motor 1 is started. The stepping motor 1 drives the rotation of the rotating shaft 9 through the coupling 5 and drives the rotation of the positioning disk 14 on the rotating shaft 9. During the rotation of the positioning disk 14, relative rotation will occur with the turntable 19 provided at the end of the material shaft 12. During the relative rotation process, the plurality of positioning pins 15 provided on the surface of the positioning disk 14 will be snap-fixed with the plurality of card slots 23 provided on the outer edge of the turntable 19, so as to realize that the rotating shaft 9 is inserted into the inner cavity 20 of the connecting sleeve 22 through the connecting hole 21 at the center of the turntable 19 to cooperate with the material shaft 12, complete the docking work with the material shaft 12, and thus realize the rotation of the material shaft 12 in the graphite furnace.

[0032] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A material shaft docking device in a graphite furnace, characterized in that It includes a motor mount (2) installed on the outer shell (6) of the graphite furnace. The motor mount (2) is bolted to the outer shell (6) of the graphite furnace through a mount base (13). One end of the motor mount (2) away from the outer shell (6) of the graphite furnace is installed with a stepping motor (1). The output end of the stepping motor (1) penetrates through the side of the motor mount (2) and extends into its interior, and is connected with a magnetic fluid seal (4) through a star-shaped coupling (3). The magnetic fluid seal (4) is bolted to the bearing seat on the outer shell (6) of the graphite furnace through a mounting seat (7). One end of the magnetic fluid seal (4) away from the stepping motor (1) is connected with a rotating shaft (9) through a coupling (5). One end of the rotating shaft (9) is rotationally matched with the bearing seat installed on the outer shell (6) of the graphite furnace, and the other end extends into the interior of the outer shell (6) of the graphite furnace. A flange structure (8) is installed on the rotating shaft (9) located in the outer shell (6) of the graphite furnace through bolts. A turntable structure (10) that is rotationally matched with the flange structure (8) is arranged at the end of the material shaft (12) in the outer shell (6) of the graphite furnace; The flange structure (8) includes a positioning disk (14). A plurality of mounting holes (17) are evenly arranged on the surface of the positioning disk (14), and positioning pins (15) are inserted through the mounting holes (17). A spring (16) is sleeved on the positioning pins (15), and a nut (18) is arranged at one end of the positioning pin (15) away from the spring (16); The turntable structure (10) includes a turntable (19) that cooperates with the positioning disk (14). A plurality of card slots (23) are evenly arranged on the outer edge of the turntable (19). The positioning pins (15) on the positioning disk (14) are in snap-fit with the card slots (23) arranged on the outer edge of the turntable (19); A material rack is installed on the material shaft (12).

2. The butt joint device for the material shaft in the graphite furnace according to claim 1, characterized in that, A connecting sleeve (22) that cooperates with the material shaft (12) is arranged on the turntable (19). A connecting hole (21) that cooperates with the rotating shaft (9) is arranged at the center of the turntable (19). The connecting hole (21) is communicated with the inner cavity (20) of the connecting sleeve (22).

3. The butt joint device for the material shaft in the graphite furnace according to claim 2, characterized in that The number of card slots (23) arranged on the outer edge of the turntable (19) is the same as the number of positioning pins (15) arranged on the surface of the positioning disk (14).

4. The butt joint device for the material shaft in the graphite furnace according to claim 3, characterized in that, One end of the rotating shaft (9) away from the positioning disk (14) penetrates through the connecting hole (21) and cooperates with the material shaft (12) in the connecting sleeve (22).

5. A graphite furnace internal material shaft docking device according to claim 4, characterized in that, The central angle corresponding to the arc length between two adjacent positioning pins (15) is 120°, and the central angle corresponding to the arc length between two adjacent card slots (23) is 120°.

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