Powder feeding device
By designing the feeding cover plate and flange sealing structure of the powder feeding device, combined with the pneumatic telescopic rod and negative pressure dust removal system, the problem of dust spillover of carbon nanotubes is solved, the sealing and dust removal efficiency of the feeding process are achieved, and the safety and stability of the production environment and product quality are ensured.
Patent Information
- Application Number
- CN202422227582.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-11
AI Technical Summary
Carbon nanotube dust is prone to spillover during feeding, resulting in environmental pollution, safety risks and unstable product quality, especially in high-end fields such as semiconductor manufacturing and pharmaceutical preparations.
A powder feeding device is designed, using a feeding cover plate and an outer flange sealing structure, combining a pneumatic telescopic rod and a negative pressure dust removal system, so as to reduce dust spillage by combining sealing and dust removal.
It effectively reduces the spillover phenomenon of carbon nanotube dust, improves the sealing and dust removal efficiency of the feeding process, and ensures safety in the production environment and stable product quality.
Smart Images
Figure CN223175337U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of powder feeding, and particularly relates to a powder feeding device. Background Art
[0002] For special materials such as carbon nanotubes with extremely low density and fine particle size, a series of challenging problems will indeed be faced in the downstream processing and application links, especially the dust control problem directly related to the feeding process. These challenges not only concern environmental protection and the maintenance of the health and safety of staff, but also profoundly affect the stability of product quality and precision control.
[0003] Specifically, when adding micro-particle substances such as carbon nanotubes to a production line or reaction system, due to factors such as electrostatic interaction between materials, air flow disturbance or improper operation, dust spillage is extremely likely to occur. This dust spillage problem first poses a serious threat to environmental pollution. Once the dust particles in the air reach a certain concentration, they will not only pollute the surrounding environment and affect air quality, but may also trigger safety risks such as explosions. Especially when staff fail to wear appropriate protective equipment, such as dust masks, protective clothing, etc., these micro-particles can easily penetrate the respiratory protection barrier, and long-term exposure to such an environment may lead to respiratory health problems, such as occupational diseases like pneumoconiosis, seriously damaging the physical health of staff.
[0004] In addition, for fields with extremely high requirements for production precision, such as semiconductor manufacturing, precision instrument processing, pharmaceutical preparations, etc., dust spillage will directly interfere with the feeding accuracy in the production process. Trace amounts of dust adhering to the equipment surface or mixing into the materials may cause deviations between the actual feeding amount and the preset value, thereby affecting the final concentration and uniformity of the product. In the semiconductor industry, even the tiniest impurity may cause a decline in chip performance or even scrapping; in pharmaceutical preparations, it may lead to changes in drug efficacy or safety hazards. Therefore, the dust spillage problem has become one of the important inducements affecting the product quality and stability in these high-tech fields. Summary of the Utility Model
[0005] In order to solve the technical problem that carbon nanotube dust is prone to spillage during feeding, the utility model provides a powder feeding device.
[0006] To achieve the above object, the technical solution adopted by the utility model is as follows:
[0007] A powder feeding device includes a feeding bin. A feeding port is provided at the top of the feeding bin. A feeding cover plate is rotatably connected to the top of the feeding bin through a rotating shaft. Telescopic rods are installed on both sides of the feeding bin in the axial direction of the rotating shaft. One end of the telescopic rod is rotatably connected to the feeding bin, and the other end of the telescopic rod is rotatably connected to the side of the feeding cover plate. An outward-turned edge is provided around the feeding port of the feeding bin, and the outward-turned edge is in surface contact with the feeding cover plate.
[0008] With the above structural solution, after a predetermined amount of material is added to the feeding bin from the feeding port, without waiting for all the material to drop into the downstream system, the telescopic rod can be extended to cover the feeding cover plate to prevent dust from overflowing. After covering the feeding cover plate, the feeding cover plate and the outward-turned edge on the outer periphery of the feeding port are in surface contact, forming a flat surface with a relatively large contact area, improving the sealing performance. The telescopic rod can also be further extended to apply pressure to the feeding cover plate, which can also improve the sealing effect. Thus, the overflow phenomenon of carbon nanotube dust during feeding can be reduced.
[0009] As a preferred implementation of a powder feeding device, the telescopic rod is a pneumatic telescopic rod.
[0010] With the above structural solution, the pneumatic telescopic rod has a simple structure, reliable operation, and fast response speed.
[0011] As a preferred implementation of a powder feeding device, a sealing ring is provided on the side of the feeding cover plate facing the feeding port, and the sealing ring is opposite to the outward-turned edge.
[0012] With the above structural solution, after covering the feeding cover plate, the feeding cover plate and the outward-turned edge on the outer periphery of the feeding port are in surface contact, forming a flat surface with a relatively large contact area, improving the sealing performance.
[0013] As a preferred implementation of a powder feeding device, a vibration pump is installed at the bottom outside the feeding bin.
[0014] With the above structural solution, the vibration pump can vibrate the bottom of the feeding bin to discharge the air entrained between adjacent agglomerates, making it easier for the carbon nanotube powder to be fed.
[0015] As a preferred implementation of a powder feeding device, a dust removal port is provided at the top inside the feeding bin, and a negative pressure dust removal box is provided at the top of the feeding bin. Dust impurities in the carbon nanotube powder are removed.
[0016] As a preferred implementation of a powder feeding device, an air inlet is provided at the bottom of the negative pressure dust removal box, and the air inlet is communicated with the dust removal port; a negative pressure air extraction pump is installed at the top of the negative pressure dust removal box, an air outlet is opened at the top of the negative pressure dust removal box, and the negative pressure air extraction pump is communicated with the air outlet.
[0017] As a preferred implementation of a powder feeding device, a separation cylinder is provided inside the negative pressure dust removal box. The two ends of the separation cylinder are through, and the separation cylinder is an inverted conical separation cylinder with a larger upper end and a smaller lower end.
[0018] As a preferred implementation of a powder feeding device, the edge of the upper end of the separation cylinder extends towards the inner wall of the negative pressure dust removal box, and ventilation holes are provided at the edge of the upper end of the separation cylinder.
[0019] As a preferred implementation of a powder feeding device, a filter plate is installed at the dust outlet, and a number of filter holes are provided on the filter plate.
[0020] With the above structural solution, when the negative pressure air pump is turned on, the airflow generated by the negative pressure air pump carries dust and some carbon nanotube powders into the negative pressure dust removal box from the dust removal port. During the upward movement with the airflow, the carbon nanotube powders will sink due to their relatively heavy weight and fall back into the feeding bin from the dust removal port. Some carbon nanotube powders will continue to rise. After the carbon nanotube powders that enter the separation cylinder from the small end of the separation cylinder and pass through the separation cylinder through the ventilation holes reach above the large end of the separation cylinder, due to the increase in the airflow space, the airflow velocity will decrease. At this time, the carbon nanotube powders will further descend under the action of gravity, and the dust will be pumped out by the negative pressure air pump through the filter plate. Thus, most of the carbon nanotube powders that enter the negative pressure dust removal box following the dust will return to the feeding bin again, significantly reducing the amount of carbon nanotube powders passing through the filter plate and being pumped out by the negative pressure air pump.
[0021] As a preferred implementation of a powder feeding device, the feeding port is inclined, and the angle between the plane where the feeding port is located and the horizontal plane is 30° - 60°.
[0022] The beneficial effects of the present utility model include:
[0023] After a predetermined amount of material is added to the feeding bin from the feeding port, without waiting for all the material to descend into the downstream system, the telescopic rod can be extended, and the feeding cover plate can be covered to avoid dust spillage. After covering the feeding cover plate, the feeding cover plate contacts the outward-turned side surface around the feeding port to form a plane, with a relatively large contact area, improving the sealing performance. The telescopic rod can also be further extended to apply pressure to the feeding cover plate, which can also improve the sealing effect. Thus, the phenomenon of carbon nanotube dust spillage during feeding can be reduced. Description of the Drawings
[0024] In order to more clearly illustrate the technical solutions of the present utility model, the drawings required for description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0025] Figure 1 This is a front structural schematic diagram of a powder feeding device in a specific embodiment of the present utility model;
[0026] Figure 2 This is a schematic diagram of the connection structure between the feeding port and the feeding cover in a specific embodiment of the present utility model;
[0027] Figure 3 This is a schematic diagram of the internal structure of the negative pressure dust removal box and the negative pressure air pump in a specific embodiment of the present invention.
[0028] List of parts and reference numerals:
[0029] 1. Feeding bin; 2. Feeding port; 3. Feeding cover; 4. Telescopic rod; 5. Outer flange; 6. Sealing ring; 7. Vibrating pump; 8. Negative pressure dust removal box; 9. Dust inlet; 10. Negative pressure vacuum pump; 11. Separation cylinder; 12. Vent; 13. Filter plate; 14. Rotating shaft. DETAILED DESCRIPTION
[0030] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.
[0031] Reference Figures 1-3 This embodiment provides a powder feeding device, comprising a feeding silo 1, a vibration pump 7 mounted on the bottom of the outside of the feeding silo 1, a feeding port 2 disposed on the top of the feeding silo 1, and a feeding cover 3 rotatably connected to the top of the feeding silo 1 via a rotating shaft 14. Telescopic rods 4 are mounted on both sides of the axial direction of the rotating shaft 14. One end of the telescopic rod 4 is rotatably connected to the feeding silo 1, and the other end of the telescopic rod 4 is rotatably connected to the side of the feeding cover 3. The telescopic rods 4 are pneumatic telescopic rods 4. The feeding silo 1 is provided with an outer flange 5 around the periphery of the feeding port 2, and the outer flange 5 is in surface contact with the feeding cover 3. A sealing ring 6 is provided on the side of the feeding cover 3 facing the feeding port 2, and the sealing ring 6 is opposite to the outer flange 5.
[0032] At the top inside the feeding bin 1, there is a dust removal port. At the top of the feeding bin 1, there is a negative pressure dust removal box 8. At the bottom of the negative pressure dust removal box 8, there is a dust inlet 9, and the dust inlet 9 is communicated with the dust removal port. At the top of the negative pressure dust removal box 8, a negative pressure air extraction pump 10 is installed. At the top of the negative pressure dust removal box 8, there is a dust outlet, and at the dust outlet, a filter plate 13 is installed. The filter plate 13 is provided with a number of filter holes, and the negative pressure air extraction pump 10 is communicated with the dust outlet. Inside the negative pressure dust removal box 8, there is a separation cylinder 11. Both ends of the separation cylinder 11 are through. The separation cylinder 11 is an inverted conical separation cylinder 11 with a larger upper end and a smaller lower end. The edge at the upper end of the separation cylinder 11 extends towards the inner wall of the negative pressure dust removal box 8, and the edge at the upper end of the separation cylinder 11 is provided with air vent holes 12.
[0033] The working principle of this embodiment is as follows:
[0034] After a predetermined amount of material is added to the feeding bin 1 from the feeding port 2, without waiting for all the material to drop into the downstream system, the telescopic rod 4 can be extended, and the feeding cover plate 3 can be covered to avoid dust overflow. After covering the feeding cover plate 3, the feeding cover plate 3 is in surface contact with the outward-turned edge 5 on the outer periphery of the feeding port 2, forming a flat surface with a relatively large contact area, improving the sealing performance. And the sealing ring 6 will stick around the feeding port 2, and the telescopic rod 4 can continue to extend to press the feeding cover plate 3, which can also improve the sealing effect.
[0035] The negative pressure air extraction pump 10 is turned on. The airflow generated by the negative pressure air extraction pump 10 carries dust and some carbon nanotube powders and enters the negative pressure dust removal box 8 from the dust removal port. During the upward movement with the airflow, the carbon nanotube powders will sink due to their relatively heavy weight and fall back into the feeding bin 1 from the dust removal port. Some carbon nanotube powders will continue to rise. The carbon nanotube powders that enter the separation cylinder 11 from the small end of the separation cylinder 11 and the carbon nanotube powders that pass through the separation cylinder 11 from the air vent holes 12, after reaching above the large end of the separation cylinder 11, due to the increase in the airflow space, the airflow velocity will decrease. At this time, the carbon nanotube powders will further descend under the action of gravity, and the dust will be extracted by the negative pressure air extraction pump 10 through the filter plate 13. Thus, most of the carbon nanotube powders that enter the negative pressure dust removal box 8 following the dust will return to the feeding bin 1 again, greatly reducing the amount of carbon nanotube powders extracted through the filter plate 13 and from the negative pressure air extraction pump 10.
[0036] The vibration pump 7 can vibrate the bottom of the feeding bin 1, discharge the air entrained between adjacent agglomerates, and make it easier for the carbon nanotube powders to be discharged.
[0037] In this embodiment, the feeding port 2 is inclined. Preferably, the plane where the feeding port 2 is located forms an angle of 30° - 60° with the horizontal plane, such as 40°, 50°, etc.
[0038] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present utility model. Therefore, the present utility model will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1. A powder feeding device, comprising a feeding bin (1), and a feeding port (2) is arranged at the top of the feeding bin (1), characterized in that, The top of the feeding bin (1) is rotatably connected with a feeding cover plate (3) through a rotating shaft (14). Telescopic rods (4) are installed on both sides of the feeding bin (1) in the axial direction of the rotating shaft (14). One end of the telescopic rod (4) is rotatably connected with the feeding bin (1), and the other end of the telescopic rod (4) is rotatably connected with the side of the feeding cover plate (3). The feeding bin (1) is provided with an outward turning edge (5) around the feeding port (2), and the outward turning edge (5) is in surface contact with the feeding cover plate (3).
2. The powder feeding device according to claim 1, characterized in that, The telescopic rod (4) is a pneumatic telescopic rod (4).
3. The powder feeding device according to claim 1, characterized in that, A sealing ring (6) is provided on the side of the feeding cover plate (3) facing the feeding port (2), and the sealing ring (6) is opposite to the outward turning edge (5).
4. A powder feeding device according to claim 1, wherein A vibration pump (7) is installed at the bottom of the outside of the feeding bin (1).
5. The powder feeding device according to claim 1, characterized in that, A dust removal port is provided at the top inside the feeding bin (1), and a negative pressure dust removal box (8) is provided at the top of the feeding bin (1).
6. The powder feeding device according to claim 5, wherein, A dust inlet (9) is provided at the bottom of the negative pressure dust removal box (8), and the dust inlet (9) is communicated with the dust removal port. A negative pressure air extraction pump (10) is installed at the top of the negative pressure dust removal box (8), an air outlet is opened at the top of the negative pressure dust removal box (8), and the negative pressure air extraction pump (10) is communicated with the air outlet.
7. A powder feeding device according to claim 5, characterized in that, A separation cylinder (11) is provided inside the negative pressure dust removal box (8). The upper and lower ends of the separation cylinder (11) are through. The separation cylinder (11) is an inverted conical separation cylinder (11) with a larger upper end and a smaller lower end.
8. A powder feeding device according to claim 7, characterized in that, The edge of the upper end of the separation cylinder (11) extends towards the inner wall of the negative pressure dust removal box (8), and air vent holes (12) are opened at the edge of the upper end of the separation cylinder (11).
9. The powder feeding device according to claim 6, wherein A filter plate (13) is installed at the air outlet, and a number of filter holes are opened in the filter plate (13).
10. A powder feeding device according to claim 1, characterized in that, The feeding port (2) is inclined, and the angle between the plane where the feeding port (2) is located and the horizontal plane is 30° - 60°.