A special screening, conveying, weighing and proportioning system for waste battery material recycling
By designing an automated screening, conveying, weighing, and batching system, the problems of incomplete screening, high dust levels, and high labor intensity of manual weighing and batching in battery material recycling have been solved. The system achieves efficient dust removal, weighing, and mixing, thereby improving automation and production capacity.
Patent Information
- Application Number
- CN202310919202.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-26
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2043-07-26
AI Technical Summary
Existing battery material recycling systems suffer from incomplete screening, high dust levels, labor-intensive manual weighing and batching, and poor mixing, all of which affect the system's practicality and efficiency.
A screening, conveying, weighing and batching system was designed, which includes components such as a feeding hopper, a mixing adapter hopper, a dust suppression pipe, an automatic cleaning component, a bidirectional mixing component, a weighing component, a filter, a vacuum conveyor, a gyratory screen, and a dust collector. This system achieves automatic dust removal, weighing and mixing, and reduces manual intervention.
It improved dust removal efficiency, reduced labor costs, ensured material screening and mixing separation effects, reduced the labor intensity of workers cleaning equipment, and improved the system's automation level and production capacity.
Smart Images

Figure CN117023151B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of waste electromagnetic material recycling technology, specifically a special screening, conveying, weighing and batching system for waste battery material recycling. Background Technology
[0002] A battery is an energy storage unit that provides electrical power to electrical loads. The electrode materials of a battery can be recycled and reused after the battery is scrapped, reducing production costs. Currently, some simple screening processes in battery material recycling systems have poor sealing, generate a lot of dust, and fail to completely separate the electrode sheets from the powder. Furthermore, there is no automatic weighing system, requiring manual weighing and batching, resulting in significant dust generation. Each stage of the process relies on manual operation, which is labor-intensive and has poor dust removal efficiency. With increasing environmental protection and intelligent requirements, there are higher demands for weighing, batching, and efficient production to reduce labor intensity. Additionally, to prevent the crushed waste materials from sticking to the feed hopper, manual cleaning of the feed hopper is required, increasing the labor intensity of cleaning equipment and affecting the system's practicality. Moreover, the existing recycling systems have simple mixing structures with poor mixing effects, causing materials to stick together in the oscillating screen, affecting the screening effect. Therefore, it is necessary to design a dedicated screening, conveying, weighing, and batching system for waste battery material recycling. Summary of the Invention
[0003] The purpose of this invention is to provide a special screening, conveying, weighing and batching system for recycling waste battery materials, so as to solve the problems mentioned in the background art.
[0004] To achieve the above objectives, the present invention provides the following technical solution: a special screening, conveying, weighing, and batching system for recycling waste battery materials, comprising a feeding hopper, a mixing adapter hopper, a dust suppression pipe, an automatic cleaning component, a bidirectional mixing component, a weighing component, a first filter, a second filter, a first vacuum conveyor, a oscillating screen, a dust removal pipe, a pulse dust collector body, a second vacuum conveyor, a third vacuum conveyor, a double-layer support, a high-speed mixer, a mixing adapter hopper, a fourth vacuum conveyor, a temporary storage hopper, and a rotary kiln. The bottom of the feeding hopper is equipped with a mixing adapter hopper, and the mixing adapter hopper... The bottom of the silo is equipped with a dust-falling pipe, one end of which is equipped with a first filter and the top of which is equipped with a second filter. The other end of the dust-falling pipe is connected to a first vacuum conveyor, which is fixedly installed on the top of the oscillating screen. The oscillating screen is equipped with a guide rail inside, and a dust removal pipe is connected to one side of the oscillating screen. The dust removal pipe is connected to the pulse dust collector body. The top of one side of the feed hopper is equipped with a motor enclosure of the automatic cleaning component. The two sides of the mixing adapter silo are respectively equipped with a first reducer and a second reducer of the bidirectional mixing component.
[0005] Preferably, the output end of the oscillating screen is connected to the second vacuum conveyor, and the bottom of the second vacuum conveyor is connected to a storage silo, and the bottom of the storage silo is connected to the spiral feed shell of the weighing assembly. The weighing assembly consists of a spiral feed shell, a worm gear reducer, a conveying motor, a conveying pipe, a spiral conveying shaft, a conveying adapter silo, a small material adapter silo, and a weighing silo assembly.
[0006] Preferably, the spiral feed shell is fixed to the top side of the conveying pipe, and one end of the conveying pipe is connected to a worm gear reducer, a conveying motor is connected to the worm gear reducer, and the output end of the worm gear reducer is connected to a spiral conveying shaft, which is rotatably connected in the conveying pipe. The other end of the conveying pipe is connected to a conveying adapter hopper, which is connected to a third vacuum conveyor, and the input end of the third vacuum conveyor is connected to a small material adapter hopper.
[0007] Preferably, the output end of the third vacuum conveyor is connected to the weighing hopper assembly, and the weighing hopper assembly is fixed on a double-layer support. A high-speed mixer is connected to the bottom of the double-layer support, and the output end of the high-speed mixer is connected to the mixing adapter hopper. The mixing adapter hopper is connected to the fourth vacuum conveyor, and the output end of the fourth vacuum conveyor is connected to the temporary storage hopper. The output end of the temporary storage hopper is connected to the rotary kiln.
[0008] Preferably, the automatic cleaning assembly consists of a motor enclosure, a gear motor, a transmission gear, a connecting gear ring, a support ring, a limiting frame, a connecting frame, and a cleaning frame. The gear motor is installed inside the motor enclosure, and the output end of the gear motor is sleeved with a transmission gear. The transmission gear meshes with the connecting gear ring, and the connecting gear ring is rotatably connected to the support ring. The support ring is fixed inside the feed hopper, and a through groove is provided at the connection between the feed hopper and the transmission gear.
[0009] Preferably, a limiting frame is provided between the support rings, and a connecting frame is rotatably connected to the limiting frame. The connecting frame is fixed on the inner wall of the connecting toothed ring, and a cleaning frame is evenly provided on the connecting frame, with the cleaning frame adhering to the inner wall of the feed hopper.
[0010] Preferably, the bidirectional stirring assembly consists of a first reducer, a second reducer, a first stirring motor, a second stirring motor, a central plate, an outer plate, a first stirring frame, a second stirring frame, and a third stirring frame. The output end of the first reducer is fixedly connected to a first rotating shaft, and the first stirring motor is connected to the first reducer. A central plate is provided on the first rotating shaft, and the first stirring frames are symmetrically arranged on the central plate.
[0011] Preferably, a second stirring motor is connected to the second reducer, and a second rotating shaft is connected to the output end of the second reducer. The second rotating shaft is connected to the mixing adapter hopper through bearings, and a second stirring frame is symmetrically arranged on the second rotating shaft. One end of the second stirring frame is fixed to an outer plate, and the outer plate is rotatably connected to a central plate. A third stirring frame is symmetrically arranged on the side of the outer plate away from the second stirring frame.
[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: This special screening, conveying, weighing and batching system for recycling waste battery materials utilizes a dust removal pipe and a pulse dust collector body located on one side of the oscillating screen to collect the dust generated during the screening process, thereby improving the dust removal effect of the system; the conveying motor and worm gear reducer are used to control the rotation and feeding process of the screw conveyor shaft, and automatic weighing is performed in the weighing hopper assembly after small materials are added, eliminating the need for manual participation in the batching and weighing process, thus reducing the labor cost of the system's recycling process; the first and second stirring motors are used to drive the central disk and the outer disk to rotate in opposite directions through the first and second rotating shafts, respectively, forming a counter-rotating stirring structure in the stirring adapter hopper, improving the actual stirring and separation effect, preventing mutually adhering materials from entering the oscillating screen, and thus ensuring the screening effect of the materials; the gear motor drives the transmission gear to rotate, and then the transmission gear meshes to drive the connecting gear ring to rotate on the support ring, and the cleaning rack on the connecting frame scrapes and cleans the inner wall of the feed hopper, thereby reducing the labor intensity of workers cleaning the equipment. Attached Figure Description
[0013] Figure 1 This is a three-dimensional diagram of the overall structure of the present invention;
[0014] Figure 2 for Figure 1 A magnified view of a portion of region A in the middle;
[0015] Figure 3 for Figure 1 A magnified view of a portion of region B in the middle;
[0016] Figure 4 This is a schematic diagram of the bidirectional stirring assembly in this invention;
[0017] Figure 5 This is an exploded view of part of the structure of the present invention;
[0018] Figure 6 This is a schematic diagram of the automatic cleaning component in this invention;
[0019] Figure 7 This is a partial front view of the structure in this invention;
[0020] Figure 8 This is a top view of part of the structure in this invention;
[0021] In the diagram: 1. Feed hopper; 2. Mixing adapter hopper; 3. Dust suppression pipe; 4. Automatic cleaning component; 5. Two-way mixing component; 6. Weighing component; 7. First filter; 8. Second filter; 9. First vacuum conveyor; 10. Vibrating screen; 11. Dust removal pipe; 12. Pulse dust collector body; 13. Second vacuum conveyor; 14. Third vacuum conveyor; 15. Double-layer support; 16. High-speed mixer; 17. Mixing adapter hopper; 18. Fourth vacuum conveyor; 19. Temporary storage hopper; 20. Rotary kiln; 41. Motor enclosure; 42. Gear motor; 43. 44. Transmission gear; 45. Connecting gear ring; 46. Support ring; 47. Limiting frame; 48. Connecting frame; 59. Cleaning frame; 50. First reducer; 51. Second reducer; 52. First mixing motor; 53. Second mixing motor; 54. Center plate; 55. Outer plate; 56. First mixing frame; 57. Second mixing frame; 58. Third mixing frame; 59. Spiral feed shell; 60. Worm gear reducer; 61. Conveyor motor; 62. Conveying pipe; 63. Spiral conveyor shaft; 64. Conveyor adapter hopper; 65. Small material adapter hopper; 66. Weighing hopper assembly. Detailed Implementation
[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0023] Please see Figure 1-8This invention provides an embodiment of a waste battery material recycling screening, conveying, weighing, and batching system, comprising a feeding hopper 1, a mixing adapter hopper 2, a dust suppression pipe 3, an automatic cleaning component 4, a bidirectional mixing component 5, a weighing component 6, a first filter 7, a second filter 8, a first vacuum conveyor 9, a oscillating screen 10, a dust removal pipe 11, a pulse dust collector body 12, a second vacuum conveyor 13, a third vacuum conveyor 14, a double-layer support 15, a high-speed mixer 16, a mixing adapter hopper 17, a fourth vacuum conveyor 18, a temporary storage hopper 19, and a rotary kiln 20. The mixing adapter hopper 2 is located at the bottom of the feeding hopper 1, and a dust suppression pipe 3 is located at the bottom of the mixing adapter hopper 2. The dust suppression pipe 3... A first filter 7 is installed at one end of the dust collection pipe 3, and a second filter 8 is installed at the top of the dust collection pipe 3. The other end of the dust collection pipe 3 is connected to a first vacuum conveyor 9, which is fixedly installed on the top of the oscillating screen 10. A guide rail is installed inside the oscillating screen 10, and a dust removal pipe 11 is connected to one side of the oscillating screen 10. The dust removal pipe 11 is connected to the pulse dust collector body 12. A motor enclosure 41 of the automatic cleaning assembly 4 is installed at the top of one side of the feed hopper 1. A first reducer 51 and a second reducer 52 of the bidirectional stirring assembly 5 are respectively installed on both sides of the stirring adapter hopper 2. The output end of the oscillating screen 10 is connected to a second vacuum conveyor 13, and the second vacuum conveyor 13... A storage hopper is connected to the bottom of the weighing assembly 6, and the bottom of the storage hopper is connected to the spiral feed housing 61 of the weighing assembly 6. The weighing assembly 6 consists of the spiral feed housing 61, a worm gear reducer 62, a conveyor motor 63, a conveying pipe 64, a spiral conveyor shaft 65, a conveyor adapter hopper 66, a small material adapter hopper 67, and a weighing hopper assembly 68. The spiral feed housing 61 is fixed to the top side of the conveying pipe 64, and one end of the conveying pipe 64 is connected to the worm gear reducer 62. The conveyor motor 63 is connected to the worm gear reducer 62, and the output end of the worm gear reducer 62 is connected to the spiral conveyor shaft 65. The spiral conveyor shaft 65 is rotatably connected in the conveying pipe 64, and the other end of the conveying pipe 64... The input end of the conveyor adapter hopper 66 is connected to the third vacuum conveyor 14, and the input end of the third vacuum conveyor 14 is connected to the small material adapter hopper 67. The output end of the third vacuum conveyor 14 is connected to the weighing hopper assembly 68, which is fixed to the double-layer support 15. The bottom of the double-layer support 15 is connected to the high-speed mixer 16, and the output end of the high-speed mixer 16 is connected to the mixing adapter hopper 17. The mixing adapter hopper 17 is connected to the fourth vacuum conveyor 18, and the output end of the fourth vacuum conveyor 18 is connected to the temporary storage hopper 19, which is connected to the rotary kiln 20.The automatic cleaning component 4 consists of a motor enclosure 41, a gear motor 42, a transmission gear 43, a connecting gear ring 44, a support ring 45, a limiting frame 46, a connecting frame 47, and a cleaning frame 48. The gear motor 42 is housed inside the motor enclosure 41, and the output end of the gear motor 42 is fitted with the transmission gear 43. The transmission gear 43 meshes with the connecting gear ring 44, and the connecting gear ring 44 is rotatably connected to the support ring 45. The support ring 45 is fixed inside the feed hopper 1, and a through groove is provided at the connection between the feed hopper 1 and the transmission gear 43. A limiting frame 46 is provided between the support rings 45, and a connecting frame 47 is rotatably connected to the limiting frame 46. The connecting frame 47 is fixed to the inner wall of the connecting gear ring 44, and cleaning frames 48 are evenly distributed on the connecting frame 47, fitting against the inner wall of the feed hopper 1. The bidirectional stirring component 5 consists of a first reducer 51, a second reducer 52, a first stirring motor 53, and a second stirring motor. The system comprises a central disc 55, an outer disc 56, a first mixing frame 57, a second mixing frame 58, and a third mixing frame 59. A first rotating shaft is fixedly connected to the output end of a first reducer 51, and a first mixing motor 53 is connected to the first reducer 51. A central disc 55 is mounted on the first rotating shaft, and the first mixing frames 57 are symmetrically arranged on the central disc 55. A second mixing motor 54 is connected to a second reducer 52, and a second rotating shaft is connected to the output end of the second reducer 52. The second rotating shaft is connected to the mixing adapter hopper 2 via bearings, and the second mixing frames 58 are symmetrically arranged on the second rotating shaft. One end of the second mixing frame 58 is fixed to the outer disc 56, and the outer disc 56 is rotatably connected to the central disc 55. The third mixing frame 59 is symmetrically arranged on the side of the outer disc 56 away from the second mixing frame 58. The second mixing frame 58 facilitates the rotation of the outer disc 56 on the central disc 55.
[0024] Working Principle: Waste battery materials are crushed by a crushing system, and the crushed material is fed into the feed hopper 1 via a cyclone collector. It then enters the mixing adapter hopper 2 for separation and mixing. Subsequently, a negative pressure is generated by the first vacuum conveyor 9, and the material is conveyed through a pipeline to the oscillating screen 10 for screening. The undersized powder material passes through the mixing adapter hopper 17 and is then transported to the storage silo by the power of the second vacuum conveyor 13. The second vacuum conveyor 13 is equipped with level sensors at the top and bottom, and a spiral feed shell 61 from the weighing assembly 6 is installed at the bottom of the second vacuum conveyor 13. A conveying adapter hopper 66 is installed at the spiral discharge port. The material hopper 66 is conveyed by the third vacuum conveyor 14 to the weighing hopper assembly 68. When the material weight approaches the required amount for a single mixing cycle, the variable frequency screw adjusts its speed based on the data displayed on the weighing instrument on the weighing hopper assembly 68. When the material is close to the required weight, the screw immediately reduces its speed to ensure weighing accuracy by reducing the conveying volume. Simultaneously, smaller materials are manually weighed and added through the smaller material adapter hopper 67, thus completing the weighing and batching operation. When the high-speed mixer 16 issues a material request signal, the weighed material enters the high-speed mixer 16 through the pneumatic butterfly valve at the bottom of the weighing hopper assembly 68 for high-speed mixing, reaching the required mixing time. Afterwards, the mixed material is transported to the temporary storage silo 19 above the rotary kiln 20 via the mixing adapter silo 17 and the fourth vacuum conveyor 18 for later use. When the rotary kiln 20 issues a material request signal, the airlock at the bottom of the temporary storage silo 19 is activated to initiate the feeding operation, thus sintering. This invention utilizes the dust removal pipe 11 and pulse dust collector body 12 located on one side of the oscillating screen 10 to collect the dust generated during the screening process, improving the system's dust removal efficiency. The conveying motor 63 and worm gear reducer 62 are used to control the rotation and feeding process of the screw conveyor shaft 65, and after small amounts of material are added, automatic weighing is performed in the weighing silo assembly 68, eliminating the need for manual intervention in the batching and weighing process. The system reduces labor costs for recycling and processing. The first stirring motor 53 and the second stirring motor 54 drive the central disk 55 and the outer disk 56 to rotate in opposite directions through the first rotating shaft and the second rotating shaft, respectively. This forms a counter-rotating stirring structure in the stirring adapter hopper 2, which improves the actual stirring and separation effect and prevents mutually sticky materials from entering the oscillating screen 10, thereby ensuring the screening effect of the materials. The gear motor 42 drives the transmission gear 43 to rotate, and then the transmission gear 43 meshes and drives the connecting gear ring 44 to rotate on the support ring 45. The cleaning rack 48 on the connecting frame 47 scrapes and cleans the inner wall of the feed barrel 1, thereby reducing the labor intensity of workers cleaning the equipment.
[0025] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A special screening conveying weighing and blending system for waste battery material recycling, comprising a feeding bucket (1), a stirring adapter bin (2), a dust falling pipeline (3), an automatic cleaning assembly (4), a bidirectional stirring assembly (5), a weighing assembly (6), a first filter (7), a second filter (8), a first vacuum conveyor (9), a swing screen (10), a dust removal pipeline (11), a pulse dust remover body (12), a second vacuum conveyor (13), a third vacuum conveyor (14), a double-layer support (15), a high-speed mixer (16), a mixing adapter bin (17), a fourth vacuum conveyor (18), a temporary storage bin (19) and a rotary kiln (20), characterized in that: The bottom of the feeding barrel (1) is provided with a stirring adapter bin (2), and the bottom of the stirring adapter bin (2) is provided with a dust falling pipeline (3), one end of the dust falling pipeline (3) is provided with a first filter (7), the top of the dust falling pipeline (3) is provided with a second filter (8), the other end of the dust falling pipeline (3) is connected with a first vacuum conveyor (9) in a matching mode, the first vacuum conveyor (9) is fixedly installed on the top of a swing screen (10), the swing screen (10) is internally provided with a flow guide track, and one side of the swing screen (10) is connected with a dust removal pipeline (11) in a matching mode, the dust removal pipeline (11) is connected with a pulse dust collector body (12) in a matching mode, the top of one side of the feeding barrel (1) is provided with a motor closed shell (41) in an automatic cleaning assembly (4), and the two sides of the stirring adapter bin (2) are respectively provided with a first speed reducer (51) and a second speed reducer (52) in a bidirectional stirring assembly (5). The output end of the swing screen (10) is connected with a second vacuum conveyor (13) in a matching mode, the bottom of the second vacuum conveyor (13) is connected with a storage warehouse in a matching mode, and the bottom of the storage warehouse is connected with a spiral feeding shell (61) in a weighing assembly (6), the bottom of the spiral feeding shell (61) is fixedly connected with a conveying pipeline (64), the other end of the conveying pipeline (64) is connected with a conveying adapter bin (66) in a matching mode, the conveying adapter bin (66) is connected with a third vacuum conveyor (14) in a matching mode, and the input end of the third vacuum conveyor (14) is connected with a small material adapter bin (67) in a matching mode. The output end of the third vacuum conveyor (14) is connected with a weighing bin assembly (68) in a matching mode, the weighing bin assembly (68) is fixed on a double-layer support (15), the bottom of the double-layer support (15) is connected with a high-speed mixer (16) in a matching mode, the output end of the high-speed mixer (16) is connected with a mixing adapter bin (17) in a matching mode, the mixing adapter bin (17) is connected with a fourth vacuum conveyor (18) in a matching mode, the output end of the fourth vacuum conveyor (18) is connected in a temporary storage bin (19), and the output end of the temporary storage bin (19) is connected with a rotary kiln (20) in a matching mode.
2. The screening, conveying, weighing and proportioning system for recycling waste battery materials according to claim 1, characterized in that: The weighing assembly (6) is composed of a spiral feeding shell (61), a turbine worm speed reducer (62), a conveying motor (63), a conveying pipeline (64), a spiral conveying shaft (65), a conveying adapter bin (66), a small material adapter bin (67) and a weighing bin assembly (68).
3. The screening, conveying, weighing and proportioning system for recycling waste battery materials according to claim 2, characterized in that: The spiral feeding shell (61) is fixed on one side of the top of the conveying pipeline (64), one end of the conveying pipeline (64) is connected with the turbine worm speed reducer (62) in a matching mode, the turbine worm speed reducer (62) is connected with the conveying motor (63) in a matching mode, the output end of the turbine worm speed reducer (62) is connected with the spiral conveying shaft (65), and the spiral conveying shaft (65) is rotatably connected in the conveying pipeline (64).
4. The screening, conveying, weighing and proportioning system for recycling waste battery materials according to claim 1, characterized in that: The automatic cleaning assembly (4) is composed of a motor closed shell (41), a gear motor (42), a transmission gear (43), a connecting gear ring (44), a supporting ring (45), a limiting frame (46), a connecting frame (47) and a cleaning frame (48), the gear motor (42) is arranged in the motor closed shell (41), the transmission gear (43) is sleeved on the output end of the gear motor (42), the transmission gear (43) is connected with the connecting gear ring (44), the connecting gear ring (44) is rotatably connected to the supporting ring (45), the supporting ring (45) is fixed in the inner part of the feeding barrel (1), and a through groove is arranged at the connecting position of the feeding barrel (1) and the transmission gear (43).
5. The screening, conveying, weighing and dosing system for recycling of waste battery material according to claim 4, characterized in that: The limiting frame (46) is arranged between the supporting rings (45), the connecting frame (47) is rotatably connected to the limiting frame (46), the connecting frame (47) is fixed to the inner wall of the connecting gear ring (44), and the cleaning frame (48) is uniformly arranged on the connecting frame (47), and the cleaning frame (48) is attached to the inner wall of the feeding barrel (1).
6. The screening, conveying, weighing and proportioning system for recycling of spent battery material according to claim 1, characterized in that: The bidirectional stirring assembly (5) is composed of a first speed reducer (51), a second speed reducer (52), a first stirring motor (53), a second stirring motor (54), a center disc (55), an external disc (56), a first stirring frame (57), a second stirring frame (58) and a third stirring frame (59), the output end of the first speed reducer (51) is fixedly connected with a first rotating shaft, the first stirring motor (53) is connected with the first speed reducer (51), the center disc (55) is arranged on the first rotating shaft, and the first stirring frame (57) is symmetrically arranged on the center disc (55).
7. The screening, conveying, weighing and dosing system for recycling of waste battery material according to claim 6, characterized in that: The second stirring motor (54) is connected with the second speed reducer (52), the output end of the second speed reducer (52) is connected with a second rotating shaft, the second rotating shaft is connected with the stirring adapter bin (2) through a bearing, the second stirring frame (58) is symmetrically arranged on the second rotating shaft, one end of the second stirring frame (58) is fixed to the external disc (56), the external disc (56) is rotatably connected to the center disc (55), and the third stirring frame (59) is symmetrically arranged on the side, away from the second stirring frame (58), of the external disc (56).
Citation Information
Patent Citations
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