Spherical graphite dust falling feeding device

By using a hydraulic cylinder and electric hoist in conjunction with a baffle system, the graphite packaging bags are cut open and the material is fed into a closed environment. Combined with a vibrating screen and a baffle gate, the problem of scattering during the feeding of spherical graphite is solved, achieving environmentally friendly and efficient transportation.

CN224493004UActive Publication Date: 2026-07-14CHANGYI SENHUI NEW MATERIALS CO LTD

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
CHANGYI SENHUI NEW MATERIALS CO LTD
Filing Date
2025-07-26
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing spherical graphite feeding devices are prone to graphite leakage during feeding, which pollutes the working environment and causes waste.

Method used

The system uses a hydraulic cylinder and an electric hoist in conjunction with a baffle system to cut open graphite packaging bags with a cutter and feed the material into a closed environment. The system also incorporates a vibrating screen and a baffle gate to reduce leakage.

Benefits of technology

It effectively reduces the escape of graphite during the feeding process, protects workers' health, reduces graphite waste, and improves transportation efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application relates to a spherical graphite dust-throwing feeding device, and belongs to the graphite conveying device field.The device comprises a rack, a support, which is arranged on the top of the rack; a feeding mechanism, which is arranged in the middle of the support and comprises a feeding box and a feeding hopper, wherein the feeding box and the feeding hopper are fixedly connected and communicated; a driving hydraulic cylinder, which is arranged on the top of the rack, and the piston rod of the driving hydraulic cylinder extends vertically upward; an I-shaped steel, which is horizontally arranged above the feeding box, and the bottom wall is fixedly arranged at the end of the piston rod of the driving hydraulic cylinder; an electric hoist, which slides along the length direction of the I-shaped steel; a baffle, which is arranged below the I-shaped steel and slides along the length direction of the I-shaped steel; and connecting pieces, which are arranged at one end of the top of the baffle and are rotatably connected with rollers at the other end, wherein the rollers abut against the top of the I-shaped steel and roll along the length direction of the I-shaped steel. The application has the effects of reducing the dispersion of the spherical graphite during feeding, reducing the pollution to the working environment of workers, and reducing the waste of the spherical graphite.
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Description

Technical Field

[0001] This application relates to the field of graphite transport devices, and in particular to a spherical graphite dust-suppressing feeding device. Background Technology

[0002] Spherical graphite is produced from high-quality, high-carbon natural flake graphite using advanced processing techniques to modify the graphite surface, resulting in graphite products of varying fineness and resembling ellipsoidal shapes. Spherical graphite materials possess excellent electrical conductivity, high crystallinity, low cost, high theoretical lithium intercalation capacity, and low and flat charge / discharge potential. They are an important component of lithium-ion battery anode materials and represent a next-generation product for anode materials used in lithium-ion battery production both domestically and internationally. They also exhibit excellent electrical conductivity and chemical stability, high charge / discharge capacity, long cycle life, and are environmentally friendly.

[0003] In actual production, a screw conveyor 11 is typically used to transport spherical graphite to the next processing step for further processing. (Refer to...) Figure 1 A spherical graphite feeding device includes a frame 1. A screw feeder 11 is fixed at the bottom of the frame 1. A discharge port is opened at the top of the frame 1 corresponding to the position of the screw feeder 11. A baffle frame 12 is fixed at the top of the frame 1, vertically arranged and surrounding the discharge port. A support 2 is mounted on the top of the frame 1. A feeding mechanism 21 is inserted through the middle of the support 2. The feeding mechanism 21 includes a feeding box 211 and a feeding hopper 212 from top to bottom. The feeding box 211 and the feeding hopper 212 are fixed and connected. The feeding box 211 has an opening at the top, and the feeding hopper 212 extends downward into the baffle frame 12. A rotating shaft is horizontally rotatably connected inside the feeding box 211. Several circular cutters are fixed along the axis of the rotating shaft, and the central axis of the cutters coincides with the central axis of the rotating shaft.

[0004] The aforementioned feeding device is typically used in conjunction with a hoisting mechanism. During feeding, the hoisting mechanism first lifts the bagged spherical graphite, then positions it directly above the feeding box 211. The hoisting mechanism moves vertically to guide the bagged spherical graphite into the feeding box 211, where its bottom contacts the cutter. The cutter then rotates to cut open the bottom of the bagged spherical graphite, allowing it to fall under its own weight into the screw conveyor 11, from where it is transported to the next operating position.

[0005] Regarding the aforementioned technologies, the inventors believe that when the above-mentioned feeding device is used to feed materials into the screw feeder 11, due to the opening at the top of the feeding hopper 212, a large amount of spherical graphite will escape from the top of the feeding box 211 when the spherical graphite falls out of the bag, which not only pollutes the working environment of the workers, but also wastes the spherical graphite. Utility Model Content

[0006] In order to reduce the escape of spherical graphite during feeding, thereby reducing pollution to the workers' working environment and reducing waste of spherical graphite, this application provides a spherical graphite dust suppression feeding device.

[0007] The spherical graphite dust suppression feeding device provided in this application adopts the following technical solution:

[0008] A spherical graphite dust-collecting feeding device includes:

[0009] The frame has a screw feeder fixed at the bottom;

[0010] The bracket is installed on top of the machine frame;

[0011] The feeding mechanism is installed in the middle of the support and includes a feeding box and a feeding hopper. The feeding box and the feeding hopper are fixedly connected and communicate with each other. A cutter is rotatably connected inside the feeding box.

[0012] A drive hydraulic cylinder is mounted on the top of the frame, and the piston rod of the drive hydraulic cylinder extends vertically upward.

[0013] The I-beam is horizontally positioned above the feeding box, with its bottom wall near one end fixed to the end of the piston rod of the driving hydraulic cylinder.

[0014] An electric hoist slides along the length of an I-beam and includes a lifting rope with a hook at the bottom.

[0015] A baffle is set below the I-beam and slides along the length of the I-beam. A clearance opening is provided in the middle, and a hoisting rope extends from above the clearance opening to below the clearance groove.

[0016] The connecting parts are in two sets. One end is set on the top of the baffle, and the other end is rotatably connected to a roller. The roller abuts against the top of the I-beam and rolls along the length of the I-beam. The two connecting parts together clamp the electric hoist.

[0017] By adopting the above technical solution and using the above device for feeding, firstly, the electric hoist lifts the bagged spherical graphite and transports it to the top of the feeding box. Then, the piston rod of the driving hydraulic cylinder retracts until the baffle abuts against the top of the feeding box. At this point, the bottom of the bagged spherical graphite is precisely against the top of the cutter. The cutter is then driven to rotate, causing it to cut open the bottom of the spherical graphite bag, allowing the spherical graphite to fall downwards under its own weight.

[0018] During this process, the baffle is placed against the top of the feeding box to create a closed feeding environment, which greatly reduces the escape of spherical graphite during feeding, thereby reducing pollution to the workers' working environment and reducing the waste of spherical graphite.

[0019] In addition, on the one hand, the baffle moves with the electric hoist, eliminating the need for additional power to connect and disconnect the baffle from the feed box; on the other hand, the baffle itself is suspended on the I-beam, which provides support for the baffle, greatly reducing the load on the electric hoist compared to directly fixing the baffle to it.

[0020] Optionally, a long groove is provided on the top of the I-beam corresponding to the movement trajectory of the roller, and the roller rolls along the length of the groove.

[0021] By adopting the above technical solution, the chute is configured to guide the movement of the roller, thereby making the movement of the roller more stable and reducing the power loss of the electric hoist.

[0022] Optional, including:

[0023] The mounting plate is horizontally positioned below the I-beam.

[0024] Two mounting rods are vertically installed on the top of the mounting plate and on both sides of the electric hoist. The ends of the mounting rods are detachably connected to the sides of the electric hoist.

[0025] The baffle includes two horizontal plates, which move towards or away from each other along the bottom side of the mounting plate;

[0026] The ends of the two connectors pass through the mounting plate and are respectively fixed to the top of the horizontal plate.

[0027] By adopting the above technical solution, when installing the baffle on both sides of the I-beam, firstly, the baffle is installed from the bottom of the electric hoist onto the I-beam, and the mounting rod is fixed to both sides of the electric hoist; then, the two connecting parts move towards each other to clamp the electric hoist; simultaneously, the two horizontal plates move towards each other until they abut against each other. In summary, this facilitates the connection and disconnection between the baffle and the I-beam.

[0028] Optionally, two screws are horizontally arranged inside the mounting plate. The screws are rotatably connected to the mounting plate near both sides, and the connection between the connector and the screws is threaded.

[0029] By adopting the above technical solution, the screw rotates to drive the connecting parts to slide towards or away from each other along the axial direction of the screw.

[0030] Optional, including:

[0031] Two driven bevel gears are fixedly mounted on the ends of the screw.

[0032] One intermediate drive shaft is rotatably connected to the side wall of the mounting plate, and the axis of the intermediate drive shaft is set horizontally.

[0033] Two drive bevel gears are fixed at both ends of the intermediate transmission shaft and mesh with the driven bevel gear.

[0034] The driven gear is fitted at the middle position of the intermediate drive shaft;

[0035] The drive gear meshes with the driven gear;

[0036] The drive motor is fixed to the side wall of the mounting plate and is used to rotate the drive gear.

[0037] By adopting the above technical solution, the output shaft of the drive motor rotates, which drives the drive gear to rotate, which in turn drives the driven gear to rotate, which in turn drives the intermediate transmission shaft to rotate, which in turn drives the drive bevel gear to rotate, and through the transmission of the driven bevel gear, drives the two screws to rotate.

[0038] Optionally, a baffle is hinged to the side wall of the support, which is used to block graphite dust escaping from the opening of the feeding hopper.

[0039] By adopting the above technical solution, closing the baffle gate can seal the conveying path of graphite from the feeding hopper to the screw conveyor, thereby reducing the escape of spherical graphite. Opening the baffle gate can also be used for maintenance of the bottom of the feeding hopper and the top of the screw conveyor.

[0040] Optionally, a baffle frame is fixedly provided on the top of the frame at the position corresponding to the screw feeder;

[0041] A screen is horizontally arranged inside the baffle frame;

[0042] A vibration motor is fixed to the side wall of the baffle frame, and the vibration motor is used to drive the screen to vibrate.

[0043] By adopting the above technical solution, the spherical graphite will clump together due to long-term accumulation and compression in the packaging bag. Before entering the screw conveyor, the spherical graphite is first thrown onto the screen surface. The vibration motor drives the screen to vibrate, thereby making the spherical graphite more dispersed in the screw conveyor and facilitating subsequent transportation.

[0044] Optionally, the mounting plate is provided with a protective cover on its side wall, which covers the driven bevel gear, intermediate transmission shaft, drive bevel gear, driven gear, drive gear and drive motor.

[0045] By adopting the above technical solution, the protective cover protects the driven bevel gear, mounting base, intermediate transmission shaft, drive bevel gear, drive motor, drive gear, and driven gear, preventing dust from escaping and entering the interior, thus avoiding pollution and wear on the mechanical mechanism. Attached Figure Description

[0046] Figure 1This is a schematic diagram of the overall structure of "a spherical graphite feeding device" in the background art of this application.

[0047] Figure 2 This is a schematic diagram of the overall structure of an embodiment of this application.

[0048] Figure 3 This is a cross-sectional view taken in the embodiment to highlight the electric hoist.

[0049] Figure 4 yes Figure 2 Enlarged view of section A in the image.

[0050] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Screw feeder; 12. Material stop frame; 13. Screen; 14. Vibrating motor; 2. Support; 21. Feeding mechanism; 211. Feeding box; 212. Feeding hopper; 3. Drive hydraulic cylinder; 31. I-beam; 311. Slide groove; 32. Electric hoist; 321. Lifting rope; 322. Hook; 33. Mounting plate; 34. Mounting rod; 35. Connecting port; 4. Connecting piece; 40. Connecting plate; 41. Connecting rod; 42. Sleeve; 43. Roller; 5. Horizontal plate; 51. Groove; 52. Clearance opening; 53. Baffle; 6. Screw; 61. Driven bevel gear; 62. Mounting base; 63. Intermediate transmission shaft; 64. Drive bevel gear; 65. Drive motor; 66. Drive gear; 67. Driven gear. Detailed Implementation

[0051] The following is in conjunction with the appendix Figure 2-4 This application will be described in further detail.

[0052] This application discloses a spherical graphite dust-collecting feeding device. (Refer to...) Figure 2 A spherical graphite dust-suppressing feeding device includes a frame 1. A screw feeder 11 is fixed at the bottom of the frame 1. A discharge port is opened at the top of the frame 1 corresponding to the position of the screw feeder 11. A baffle frame 12 is fixed at the top of the frame 1, and the baffle frame 12 is vertically arranged and surrounds the outside of the discharge port. A screen 13 is horizontally arranged inside the baffle frame 12. A vibration motor 14 is fixed on the side wall of the baffle frame 12, and the vibration motor 14 is used to drive the screen 13 to vibrate.

[0053] Reference Figure 2A support frame 2 is mounted on the top of the frame 1. A baffle gate is hinged to the side of the support frame 2 to prevent graphite dust from escaping from the opening of the feeding hopper 212. A feeding mechanism 21 is installed in the middle of the support frame 2. The feeding mechanism 21 includes a feeding box 211 and a feeding hopper 212 from top to bottom. The feeding box 211 and the feeding hopper 212 are fixedly connected and communicate with each other. The feeding box 211 has an opening at the top, and the feeding hopper 212 extends into the baffle frame 12 below. A rotating shaft is horizontally rotatably connected inside the feeding box 211. Several circular cutters are fixed along the axis of the rotating shaft, and the central axis of the cutters coincides with the central axis of the rotating shaft.

[0054] Reference Figure 2 A driving hydraulic cylinder 3 is fixedly mounted on the top of the frame 1. The driving hydraulic cylinder 3 is vertically arranged, and the piston rod of the driving hydraulic cylinder 3 extends vertically upward. An I-beam 31 is fixedly mounted on the end of the piston rod of the driving hydraulic cylinder 3. The I-beam 31 is horizontally arranged above the feeding box 211, and the bottom wall of the I-beam 31 near one end is fixedly connected to the end of the piston cylinder of the driving hydraulic cylinder 3.

[0055] Reference Figure 3 An electric hoist 32 is provided on the bottom side of the I-beam 31. The electric hoist 32 slides along the length of the I-beam 31. The electric hoist 32 includes a lifting rope 321, and a hook 322 is provided at the bottom of the lifting rope 321.

[0056] Reference Figure 4 A mounting plate 33 is provided below the I-beam 31 at the position corresponding to the electric hoist 32. Two mounting rods 34 are fixed on the top of the mounting plate 33. The mounting rods 34 are vertically arranged and respectively located on both sides of the electric hoist 32. The end of the mounting rod 34 away from the mounting plate 33 is connected to the electric hoist 32 by bolts. A connecting opening 35 is provided in the middle of the mounting plate 33.

[0057] Reference Figure 4 Two connectors 4 are fixedly mounted on the top of the mounting plate 33. Each connector 4 includes, from bottom to top, a connecting plate 40, three connecting rods 41, and three sleeves 42. The two connecting plates 40 are respectively arranged on both sides of the electric hoist 32 and are perpendicular to the mounting rods 34. The connecting rods 41 are evenly distributed along the top of the connecting plate 40 and are L-shaped to engage with the electric hoist 32. The sleeves 42 are fitted on the top of the connecting rods 41 and slide vertically along the connecting rods 41. The sleeves 42 on both sides of the electric hoist 32 extend upward and bend towards each other at the top of the I-beam 31. Rollers 43 are rotatably connected to the ends of the sleeves 42 that are close to each other. A groove 311 is opened at the top of the I-beam 31 corresponding to the position of the rollers 43. The groove 311 extends along the length of the I-beam 31, and the rollers 43 roll along the length of the groove 311. The chute 311 is configured to guide the movement of the roller 43, thereby making the movement of the roller 43 more stable.

[0058] Reference Figure 3 The bottom of the connecting rod 41 is recessed towards each other and connected. The bottom end of the connecting rod 41 extends vertically downward and passes through the mounting plate 33. Horizontal plates 5 are fixed to the bottom ends of the connecting rod 41 respectively. The horizontal plates 5 are horizontally set. The tops of the two horizontal plates 5 abut against the bottom of the mounting plate 33 and move towards or away from each other along the mounting plate 33. A U-shaped groove 51 is opened on the side of the horizontal plates 5 that is close to each other. The two U-shaped grooves 51 hug each other to form a clearance opening 52. The two horizontal plates 5 are connected to form a baffle 53.

[0059] Reference Figure 4 Two screws 6 are rotatably connected inside the mounting plate 33, and the screws 6 are rotatably connected to the mounting plate 33 near both sides. The connecting piece 4 is threadedly connected to the screws 6. One end of the screw 6 extends to the outside of the mounting plate 33 and is fixedly connected to a driven bevel gear 61. Two mounting seats 62 are fixedly fixed on the side of the mounting plate 33 where the driven bevel gear 61 is located. The mounting seats 62 are plate-shaped. An intermediate drive shaft 63 is rotatably connected inside the mounting seats 62. The axis of the intermediate drive shaft 63 is horizontal. A drive bevel gear 64 is fixedly connected to each end of the intermediate drive shaft 63. The drive bevel gear 64 meshes with the driven bevel gear 61. A drive motor 65 is fixedly fixed on the side of the mounting frame where the mounting seats 62 are located. The body of the drive motor 65 is fixed to the side wall of the mounting frame. A drive gear 66 is fixedly connected to the output shaft of the drive motor 65. A driven gear 67 meshes with the side wall of the drive gear 66. The driven gear 67 is sleeved on the intermediate drive shaft 63 near the middle position and is fixedly connected to the intermediate drive shaft 63. A protective cover is fixed to one side of the mounting plate 33 where the drive bevel gear 64 is located. The protective cover covers the driven bevel gear 61, mounting base 62, intermediate transmission shaft 63, drive bevel gear 64, drive motor 65, drive gear 66, and driven gear 67. The protective cover protects the driven bevel gear 61, mounting base 62, intermediate transmission shaft 63, drive bevel gear 64, drive motor 65, drive gear 66, and driven gear 67, preventing dust from escaping and entering the interior, thus avoiding contamination and wear on the mechanical mechanism.

[0060] The output shaft of the drive motor 65 rotates, which drives the drive gear 66 to rotate, which in turn drives the driven gear 67 to rotate, which in turn drives the intermediate transmission shaft 63 to rotate, which in turn drives the drive bevel gear 64 to rotate, and through the transmission of the driven bevel gear 61, drives the two screws 6 to rotate.

[0061] The implementation principle of the spherical graphite dust-suppressing feeding device in this application embodiment is as follows:

[0062] When using the above-mentioned device for feeding, firstly, the electric hoist 32 lifts the bagged spherical graphite and transports it to the top of the feeding box 211. During this process, the baffle plate moves with the electric hoist 32. The piston rod of the driving hydraulic cylinder 3 retracts until the baffle plate 53 abuts against the top of the feeding box 211. At this time, the bottom of the bagged spherical graphite is exactly against the top of the cutter. The cutter is driven to rotate, so that it cuts the bottom of the spherical graphite packaging bag, and the spherical graphite falls downwards under its own weight.

[0063] Because spherical graphite will clump together due to long-term accumulation and compression in the packaging bag, the spherical graphite is first thrown onto the surface of the screen 13 before entering the screw feeder 11. The vibration motor 14 vibrates and drives the screen 13 to vibrate, thereby making the spherical graphite more dispersed in the screw feeder 11, which is convenient for subsequent transportation.

[0064] During this process, the baffle 53 abuts against the top of the feeding hopper 211, creating a closed feeding environment, which greatly reduces the escape of spherical graphite during feeding, thereby reducing pollution to the workers' working environment and reducing the waste of spherical graphite. Furthermore, closing the baffle gate ensures that the transport path of graphite from the feeding hopper 212 to the screw conveyor 11 is sealed, further reducing the escape of spherical graphite.

[0065] When installing the baffle 53 on both sides of the I-beam 31, first, install the baffle 53 from the bottom of the electric hoist 32 onto the I-beam 31, and then fix the mounting rod 34 on both sides of the electric hoist 32.

[0066] Then, the output shaft of the drive motor 65 rotates, driving the drive gear 66 to rotate, which in turn drives the driven gear 67 to rotate, which in turn drives the intermediate transmission shaft 63 to rotate, driving the drive bevel gear 64 to rotate. Through the transmission of the driven bevel gear 61, the two screws 6 rotate. This causes the two connecting parts 4 to move towards each other, clamping the electric hoist 32. At the same time, the two horizontal plates 5 move towards each other until they abut against each other. In summary, this facilitates the connection and disconnection between the baffle 53 and the I-beam 31.

[0067] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A spherical graphite dust-collecting feeding device, characterized in that: Includes a frame (1), with a screw feeder (11) fixed at the bottom; Support (2) is mounted on top of frame (1); The feeding mechanism (21) is installed in the middle of the support (2) and includes a feeding box (211) and a feeding hopper (212). The feeding box (211) and the feeding hopper (212) are fixedly connected and communicate with each other. A cutter is rotatably connected inside the feeding box (211). A driving hydraulic cylinder (3) is set on the top of the frame (1), and the piston rod of the driving hydraulic cylinder (3) extends vertically upward; The I-beam (31) is horizontally positioned above the feeding box (211), with its bottom wall near one end fixed to the end of the piston rod of the driving hydraulic cylinder (3). An electric hoist (32) slides along the length of the I-beam (31) and includes a hoisting rope (321) with a hook (322) at the bottom of the hoisting rope (321); A baffle (53) is set below the I-beam (31) and slides along the length of the I-beam (31). A relief opening (52) is provided in the middle, and a hanging rope (321) extends from above the relief opening (52) to below the relief groove. Two sets of connectors (4) are provided, one end of which is set on the top of the baffle (53), and the other end is rotatably connected to a roller (43). The roller (43) abuts against the top of the I-beam (31) and rolls along the length of the I-beam (31). The two connectors (4) together clamp the electric hoist (32).

2. The spherical graphite dust-collecting feeding device according to claim 1, characterized in that: The top of the I-beam (31) is provided with a long strip groove (311) corresponding to the movement trajectory of the roller (43), and the roller (43) rolls along the length direction of the groove (311).

3. The spherical graphite dust-collecting feeding device according to claim 1, characterized in that: include: Mounting plate (33) is horizontally positioned below I-beam (31); Two mounting rods (34) are vertically set on the top of the mounting plate (33) and respectively set on both sides of the electric hoist (32). The ends of the mounting rods (34) are detachably connected to both sides of the electric hoist (32). The baffle (53) includes two horizontal plates (5), which move towards or away from each other along the bottom side of the mounting plate (33); The ends of the two connectors (4) pass through the mounting plate (33) and are respectively fixed to the top of the horizontal plate (5).

4. The spherical graphite dust-collecting feeding device according to claim 3, characterized in that: Two screws (6) are horizontally arranged inside the mounting plate (33). The screws (6) are rotatably connected to the mounting plate (33) near both sides. The connector (4) and the screws (6) are threaded together.

5. The spherical graphite dust-collecting feeding device according to claim 4, characterized in that: include: Two driven bevel gears (61) are fixed to the ends of the screw (6); An intermediate drive shaft (63) is rotatably connected to the side wall of the mounting plate (33), and the axis of the intermediate drive shaft (63) is set horizontally. Two drive bevel gears (64) are fixed at both ends of the intermediate transmission shaft (63) and mesh with the driven bevel gear (61); The driven gear (67) is fitted in the middle position of the intermediate transmission shaft (63); The drive gear (66) meshes with the driven gear (67); A drive motor (65) is fixed to the side wall of the mounting plate (33) and is used to rotate the drive gear (66).

6. The spherical graphite dust-collecting feeding device according to claim 1, characterized in that: The support (2) has a baffle door hinged to its side wall, which is used to block graphite dust from escaping from the opening of the feeding hopper (212).

7. The spherical graphite dust-collecting feeding device according to claim 1, characterized in that: A baffle frame (12) is fixedly provided at the top of the frame (1) at the position corresponding to the screw feeder (11); A screen (13) is horizontally arranged inside the baffle frame (12); The side wall of the baffle frame (12) is fixed with a vibration motor (14), which is used to drive the screen (13) to vibrate.

8. The spherical graphite dust-collecting feeding device according to claim 5, characterized in that: The mounting plate (33) has a protective cover on its side wall, which covers the driven bevel gear (61), intermediate transmission shaft (63), drive bevel gear (64), driven gear (67), drive gear (66) and drive motor (65).