Sample pretreatment device for carbon nanotube purity detection

Abstract

This utility model relates to the technical field of pretreatment devices, and in particular to a sample pretreatment device for carbon nanotube purity detection. It includes a base with two symmetrically mounted uprights on its top. A tank is positioned between the two uprights, and an insulation sleeve is mounted on the side of the tank. Both sides of the insulation sleeve are rotatably connected to the corresponding uprights via connecting shafts. A box is mounted on the side of one of the uprights, with one end of a connecting shaft extending into the box and a gear mounted at its end. A strip-shaped connecting plate is located inside the box, with a rack mounted on its top, meshing with the gear. A connecting block is mounted on the bottom of the strip-shaped connecting plate. This application utilizes a telescopic mechanism to drive the rack horizontally, and under the action of the rack and gear, it can drive the tank in a semi-circular reciprocating rotational motion, thus performing multiple grinding operations on the carbon nanotube sample inside the tank, ensuring thorough grinding.

Description

Technical Field

[0001] This utility model relates to the field of pretreatment device technology, and in particular to a sample pretreatment device for carbon nanotube purity detection. Background Technology

[0002] Carbon nanotubes are nanoscale tubular materials composed of carbon atoms and belong to the allotropes of carbon. Their structure can be viewed as a hollow tubular structure formed by rolling up one or more layers of graphene, possessing unique physical, chemical, and mechanical properties. When testing carbon nanotube samples, pretreatment is required.

[0003] Existing pretreatment devices typically require samples to be fed into a grinding mechanism to grind carbon nanotubes to the required size. However, existing grinding methods only allow for a single grinding pass, resulting in insufficient grinding. Furthermore, the friction generated during grinding generates heat in the carbon nanotubes, and while existing grinding equipment generally uses external cooling mechanisms to cool the samples, this is insufficient and leads to poor performance. Therefore, we propose a sample pretreatment device for carbon nanotube purity testing. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing a sample pretreatment device for carbon nanotube purity detection.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a sample pretreatment device for carbon nanotube purity detection is designed, including a base, two upright plates symmetrically installed on the top of the base, a tank between the two upright plates, and a heat insulation sleeve installed on the side of the tank. Both sides of the heat insulation sleeve are rotatably connected to the corresponding upright plate through a connecting shaft. A box is installed on the side of one of the uprights. One end of a connecting shaft extends into the box and a gear is installed at the end of the connecting shaft. A strip connecting plate is provided inside the box. A rack is installed on the top of the strip connecting plate and meshes with the gear. A connecting block is installed at the bottom of the strip connecting plate. One side of the connecting block is connected to the side of the box through a telescopic mechanism. An end cap is installed on the top of the tank. A hollow shaft is coaxially rotatably connected to the bottom of the end cap. The top of the hollow shaft passes through the end cap and is connected to the drive mechanism. A grinding head is installed on the side of the hollow shaft, and a grinding sleeve is coaxially installed on the inner wall of the tank. The grinding head is located inside the grinding sleeve. A space is formed between the insulation jacket and the side wall of the tank. A heat exchange tube is installed in the space. A cryogenic pump is installed on the top of the base. The inlet of the cryogenic pump is connected to the liquid nitrogen storage tank through a pipe. The outlet of the cryogenic pump is connected to a second delivery pipe. The other end of the second delivery pipe is connected to a diverter pipe. One end of the diverter pipe is fixed to the heat exchange tube, and the other end of the diverter pipe is connected to the end of the hollow shaft through a swivel joint. The bottom end of the hollow shaft passes through the tank body, and the bottom end of the hollow shaft is connected to a material collection pipe through a rotating joint. The other end of the material collection pipe passes through the insulation sleeve and is connected to the other end of the heat exchange tube. The side of the material collection pipe is connected to a first conveying pipe. The other end of the first conveying pipe is installed at the inlet of the low-temperature heat exchanger, and the outlet of the low-temperature heat exchanger is connected to the liquid nitrogen storage tank through a pipe.

[0006] Preferably, one side of the strip connecting plate is slidably connected to a dovetail groove formed on the side of the upright plate via a dovetail block.

[0007] Preferably, when the telescopic mechanism extends to its maximum stroke, the rotation angle of the connecting shaft is A, where 0°≤A≤180°.

[0008] Preferably, a cover plate is provided at one end of the box body near the opening, the cover plate covers the opening of the box body, and the edge of the cover plate is fastened to the end of the box body by bolts.

[0009] Preferably, the drive mechanism includes a housing mounted on the top of the end cover, the top of the hollow shaft passing through the housing, and a first bevel gear mounted on the top side of the hollow shaft. A second bevel gear is rotatably connected inside the housing, the second bevel gear meshing with the first bevel gear, and one end of the second bevel gear being connected to a drive motor, which is fixed on the side of the housing.

[0010] Preferably, a hopper is installed on the top of the end cap, one end of which is connected to the inside of the tank, and a valve is installed on one end of the hopper.

[0011] Preferably, the bottom of the end cap is inclined, and the inclination direction is towards the hopper discharge port.

[0012] Preferably, both the first and second delivery pipes are vacuum-insulated flexible hoses.

[0013] The design scheme proposed in this utility model has the following beneficial effects in application: 1. The telescopic mechanism can drive the rack to move horizontally, and under the action of the rack and gear, it can drive the tank to rotate in a semi-circular motion, so as to grind the carbon nanotube sample in the tank multiple times and grind it thoroughly.

[0014] 2. Liquid nitrogen can be simultaneously delivered to the heat exchange tube and hollow shaft through the second delivery pipe and the split pipe by the cryogenic pump, so as to fully cool down the carbon nanotube sample in the tank and keep the carbon nanotube sample at a low temperature during grinding, thereby improving the use effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the tank, heat exchange tube, and cryogenic pump structure of this utility model; Figure 4 This is a side sectional view of the tank structure of this utility model.

[0016] In the diagram: 1. Base; 2. Collecting pipe; 3. First conveying pipe; 4. Low-temperature heat exchanger; 5. Vertical plate; 6. Insulation sleeve; 7. End cap; 8. Valve; 9. Hopper; 10. Outer shell; 11. Diverter pipe; 12. Drive motor; 13. Second conveying pipe; 14. Box body; 15. Gear; 16. Rack; 17. Cover plate; 18. Telescopic mechanism; 19. Connecting block; 20. Strip connecting plate; 21. Low-temperature pump; 22. Tank body; 23. Heat exchange pipe; 24. First bevel gear; 25. Grinding head; 26. Grinding sleeve; 27. Hollow shaft; 28. Second bevel gear; 29. ​​Connecting shaft. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0018] Reference Figures 1-4 A sample pretreatment device for carbon nanotube purity detection includes a base 1. Two upright plates 5 are symmetrically installed on the top of the base 1. A tank 22 is provided between the two upright plates 5. A heat insulation sleeve 6 is installed on the side of the tank 22. Both sides of the heat insulation sleeve 6 are rotatably connected to the corresponding upright plate 5 through a connecting shaft 29. Under the action of the connecting shaft 29, the heat insulation sleeve 6 can rotate relative to the upright plate 5, thereby controlling the rotation of the tank 22 relative to the upright plate 5. like Figure 1As shown, a box 14 is installed on the side of one of the upright plates 5. One end of a connecting shaft 29 extends into the box 14, and a gear 15 is installed at the end of the connecting shaft 29. A strip connecting plate 20 is provided inside the box 14. A rack 16 is installed on the top of the strip connecting plate 20 and meshes with the gear 15. A connecting block 19 is installed at the bottom of the strip connecting plate 20. One side of the connecting block 19 is connected to the side of the box 14 through a telescopic mechanism 18. The telescopic mechanism 18 is one of an electric push rod, a cylinder, or a hydraulic cylinder. In actual use, the telescopic mechanism 18 can push the connecting block 19 to move, so that the strip connecting plate 20 drives the rack 16 to move. During the movement, the rack 16 drives the gear 15 to rotate, thereby controlling the tank 22 to rotate with the connecting shaft 29.

[0019] like Figure 4 As shown, an end cap 7 is installed on the top of the tank 22, and a hopper 9 is installed on the top of the end cap 7. One end of the hopper 9 is connected to the inside of the tank 22. In actual use, the staff can transport the carbon nanotube sample through the hopper 9 into the tube head 22 for pretreatment.

[0020] A hollow shaft 27 is rotatably connected to the bottom of the end cover 7. The top of the hollow shaft 27 passes through the end cover 7 and is connected to the drive mechanism. The drive mechanism includes a housing 10 mounted on the top of the end cover 7. The top of the hollow shaft 27 passes through the housing 10, and a first bevel gear 24 is mounted on the top side of the hollow shaft 27. A second bevel gear 28 is rotatably connected inside the housing 10. The second bevel gear 28 meshes with the first bevel gear 24, and one end of the second bevel gear 28 is connected to the drive motor 12. The drive motor 12 is fixed on the side of the housing 10. In actual use, the drive motor 12 can drive the second bevel gear 28 to rotate, and the second bevel gear 28 drives the hollow shaft 27 to rotate through the first bevel gear 24.

[0021] like Figure 4 As shown, a grinding head 25 is mounted on the side of the hollow shaft 27, and a grinding sleeve 26 is coaxially mounted on the inner wall of the tank 22. The grinding head 25 is located inside the grinding sleeve 26. When the hollow shaft 27 rotates, it will drive the grinding head 25 to rotate relative to the grinding sleeve 26, thereby grinding the carbon nanotube sample in the tank 22.

[0022] It should be noted that when the telescopic mechanism 18 extends to its maximum stroke, the connecting shaft 29 rotates at an angle of A, where 0°≤A≤180°. This allows the telescopic mechanism 18 to control the tank 22 to rotate in a semi-circular motion during extension and retraction. After the carbon nanotubes are ground, the tank 22 can be rotated 180° so that the ground carbon nanotubes are positioned above the grinding head 25. At this point, under gravity, the carbon nanotubes, after the initial grinding, will fall between the grinding head 25 and the grinding sleeve 26 for secondary grinding. After the secondary grinding, the operator can control the tank 22 to return to its original position. The carbon nanotubes will then be positioned above the grinding head 25 again, and under gravity, the grinding head 25 and the grinding sleeve 26 can grind the carbon nanotubes again, ensuring thorough grinding.

[0023] It should be noted that, as Figure 1 and Figure 4 As shown, a valve 8 is installed at one end of the hopper 9, which can seal the hopper 9 so that the sample will not leak from the hopper 9 when the carbon nanotube sample in the tank 22 is repeatedly ground.

[0024] like Figure 2 and Figure 3 As shown, an accommodating space is formed between the insulation sleeve 6 and the side wall of the tank 22. A heat exchange tube 23 is installed within this accommodating space, and a cryogenic pump 21 is mounted on the top of the base 1. The inlet of the cryogenic pump 21 is connected to the liquid nitrogen storage tank via a pipe, and the outlet of the cryogenic pump 21 is connected to a second delivery pipe 13. The other end of the second delivery pipe 13 is connected to a diversion pipe 11. One end of the diversion pipe 11 is fixed to the heat exchange tube 23, and the other end of the diversion pipe 11 is connected to the end of the hollow shaft 27 via a rotating joint. In actual use, the cryogenic pump 21 can transport liquid nitrogen from the liquid nitrogen storage tank to the second delivery pipe 13 through the pipeline, and then to the distribution pipe 11 through the second delivery pipe 13. Finally, the liquid nitrogen can flow into the heat exchange pipe 23 and the hollow shaft 27. The carbon nanotube sample inside the tank 22 can be cooled from the outside of the tank 22 through the heat exchange pipe 23, and the liquid nitrogen flowing in the hollow shaft 27 can cool the carbon nanotube sample from the inside of the grinding head 25, so that the cooling is sufficient.

[0025] like Figure 3 and Figure 4As shown, the bottom end of the hollow shaft 27 passes through the tank 22, and the bottom end of the hollow shaft 27 is connected to the collecting pipe 2 via a rotating joint. The other end of the collecting pipe 2 passes through the insulation sleeve 6 and is connected to the other end of the heat exchange pipe 23. The side of the collecting pipe 2 is connected to the first conveying pipe 3. The other end of the first conveying pipe 3 is installed at the inlet of the low-temperature heat exchanger 4, and the outlet of the low-temperature heat exchanger 4 is connected to the liquid nitrogen storage tank via a pipe. After the liquid nitrogen in the heat exchange pipe 23 and the hollow shaft 27 cools the carbon nanotube sample in the tank 22, it will be transported along the collecting pipe 2 to the first conveying pipe 3, and then along the first conveying pipe 3 to the low-temperature heat exchanger 4. After the liquid nitrogen is cooled and liquefied by the low-temperature heat exchanger 4, it will flow back to the liquid nitrogen storage tank through the pipe, so that it can be recycled.

[0026] It should be noted that both the first delivery pipe 3 and the second delivery pipe 13 are vacuum insulated hoses, so that the first delivery pipe 3 and the second delivery pipe 13 can move along with the rotation of the tank 22 as the tank 22 rotates in a semi-circular manner.

[0027] Furthermore, one side of the strip connecting plate 20 is slidably connected to the dovetail groove opened on the side of the upright plate 5 via a dovetail block. Through the cooperation of the dovetail block and the dovetail groove, the strip connecting plate 20 can be limited, so that the strip connecting plate 20 remains stable when moving.

[0028] like Figure 1 As shown, a cover plate 17 is provided at one end of the box 14 near the opening. The cover plate 17 covers the opening of the box 14, and the edge of the cover plate 17 is fastened to the end of the box 14 by bolts. The cover plate 17 can cover the opening of the box 14, thereby protecting the mechanism inside the box 14.

[0029] Specifically, in use, the worker transports the carbon nanotube sample into the tank 22 through the hopper 9, then closes the valve 8. The worker then controls the drive motor 12, which, under the action of the first bevel gear 24 and the second bevel gear 28, drives the hollow shaft 27 to rotate. The hollow shaft 27 drives the grinding head 25 to rotate. The raw material falling into the tank 22 passes between the grinding head 25 and the grinding sleeve 26 under gravity and falls below the tank 22. During this process, the grinding head 25 performs preliminary grinding on the carbon nanotube raw material. After grinding, the worker controls the telescopic mechanism 18 to move the connecting block 19. The rack 16 is moved by the strip connecting plate 20. The rack 16 drives the connecting shaft 29 to rotate under the action of the gear 15, which in turn controls the tank body 22 to rotate 180°, so that the tank end cover 7 rotates to the bottom. At this time, the carbon nanotube sample is above the grinding head 25. Under the action of gravity, the carbon nanotubes after the first grinding will fall between the grinding head 25 and the grinding sleeve 26 for a second grinding. After the second grinding, the operator can control the tank body 22 to return to its original position. At this time, the carbon nanotubes are above the grinding head 25 again. Under the action of gravity, the grinding head 25 and the grinding sleeve 26 can grind the carbon nanotubes again. In this way, the carbon nanotube sample can be ground multiple times to ensure thorough grinding. During the grinding process, the cryogenic pump 21 can transport liquid nitrogen from the liquid nitrogen storage tank to the second delivery pipe 13 through the pipeline, and then to the distribution pipe 11 through the second delivery pipe 13. The distribution pipe 11 simultaneously receives liquid nitrogen from the heat exchange pipe 23 and the hollow shaft 27. When the liquid nitrogen flows through the heat exchange pipe 23, it can cool the carbon nanotube sample inside the tank 22 from the outside of the tank 22. At the same time, when the liquid nitrogen flows through the hollow shaft 27, it can cool the sample through the inside of the grinding head 25. After sufficient cooling, the cooled liquid nitrogen can be transported to the first delivery pipe 3 through the collection pipe 2. The liquid nitrogen is transported along the first delivery pipe 3 to the cryogenic heat exchanger 4 for cooling and then transported back to the liquid nitrogen storage tank through the pipeline for recycling.

[0030] Furthermore, such as Figure 4 As shown, the bottom of the end cap 7 is inclined, and the inclined direction is towards the feed inlet of the hopper 9. After grinding is completed, the end cap 7 is rotated to the bottom of the tank body 22, and then the valve 8 is opened, and the ground raw material can be discharged from the tank body 22 through the hopper 9.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A sample pretreatment device for carbon nanotube purity detection, comprising a base (1), characterized in that: Two upright plates (5) are symmetrically installed on the top of the base (1). A tank (22) is provided between the two upright plates (5). An insulation sleeve (6) is installed on the side of the tank (22). Both sides of the insulation sleeve (6) are rotatably connected to the corresponding upright plate (5) through a connecting shaft (29). A box (14) is installed on the side of one of the upright plates (5), one end of a connecting shaft (29) extends into the box (14), and a gear (15) is installed at the end of the connecting shaft (29). A strip connecting plate (20) is provided inside the box (14). A rack (16) is installed on the top of the strip connecting plate (20). The rack (16) meshes with the gear (15). A connecting block (19) is installed at the bottom of the strip connecting plate (20). One side of the connecting block (19) is connected to the side of the box (14) through a telescopic mechanism (18). The top of the tank (22) is fitted with an end cap (7), and the bottom of the end cap (7) is coaxially rotatably connected to a hollow shaft (27). The top of the hollow shaft (27) passes through the end cap (7) and is connected to the drive mechanism. A grinding head (25) is installed on the side of the hollow shaft (27), and a grinding sleeve (26) is coaxially installed on the inner wall of the tank (22). The grinding head (25) is located inside the grinding sleeve (26). A space is formed between the insulation sleeve (6) and the side wall of the tank body (22). A heat exchange tube (23) is provided in the space. A cryogenic pump (21) is installed on the top of the base (1). The air inlet of the cryogenic pump (21) is connected to the liquid nitrogen storage tank through a pipe. The liquid outlet of the cryogenic pump (21) is connected to a second delivery pipe (13). The other end of the second delivery pipe (13) is connected to a diversion pipe (11). One end of the diversion pipe (11) is fixed to the heat exchange tube (23). The other end of the diversion pipe (11) is connected to the end of the hollow shaft (27) through a rotating joint. The bottom end of the hollow shaft (27) passes through the tank body (22), and the bottom end of the hollow shaft (27) is connected to the collecting pipe (2) through a rotating joint. The other end of the collecting pipe (2) passes through the insulation sleeve (6) and is connected to the other end of the heat exchange pipe (23). The side of the collecting pipe (2) is connected to the first conveying pipe (3). The other end of the first conveying pipe (3) is installed at the inlet of the low temperature heat exchanger (4), and the outlet of the low temperature heat exchanger (4) is connected to the liquid nitrogen storage tank through a pipe.

2. The sample pretreatment device for carbon nanotube purity detection according to claim 1, characterized in that: One side of the strip connecting plate (20) is slidably connected to the dovetail groove opened on the side of the upright plate (5) via a dovetail block.

3. The sample pretreatment device for carbon nanotube purity detection according to claim 2, characterized in that: When the telescopic mechanism (18) extends to its maximum stroke, the connecting shaft (29) rotates by an angle of A, where 0°≤A≤180°.

4. The sample pretreatment device for carbon nanotube purity detection according to claim 1, characterized in that: The box (14) has a cover plate (17) at one end near the opening. The cover plate (17) covers the opening of the box (14), and the edge of the cover plate (17) is fastened to the end of the box (14) by bolts.

5. The sample pretreatment device for carbon nanotube purity detection according to claim 1, characterized in that: The drive mechanism includes a housing (10) mounted on the top of the end cover (7), the top of the hollow shaft (27) passing through the housing (10), and a first bevel gear (24) mounted on the top side of the hollow shaft (27). A second bevel gear (28) is rotatably connected inside the housing (10). The second bevel gear (28) meshes with the first bevel gear (24), and one end of the second bevel gear (28) is connected to the drive motor (12). The drive motor (12) is fixed on the side of the housing (10).

6. The sample pretreatment device for carbon nanotube purity detection according to claim 1, characterized in that: A hopper (9) is installed on the top of the end cap (7). One end of the hopper (9) is connected to the inside of the tank body (22), and a valve (8) is installed on one end of the hopper (9).

7. The sample pretreatment device for carbon nanotube purity detection according to claim 6, characterized in that: The bottom of the end cap (7) is inclined, and the inclined direction is towards the discharge port of the hopper (9).

8. The sample pretreatment device for carbon nanotube purity detection according to claim 1, characterized in that: Both the first delivery pipe (3) and the second delivery pipe (13) are vacuum-insulated flexible hoses.

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