Shaping device for high-compaction negative electrode material

Abstract

The invention belongs to the technical field of battery negative electrode material processing, and particularly relates to a shaping device for a high-compaction negative electrode material. The reshaping device comprises a reshaping machine, a screening device and a circulator, and the circulator comprises a recovery pipeline used for connecting the discharge port and the feed port, a circulating pipeline used for connecting the recovery port and the circulating port, an exhaust fan arranged at the side end of the recovery pipeline and a valve body arranged on the circulating pipeline. Through the arrangement of the shaping machine, the screening device and the circulator, the purpose that a single shaping machine can circularly crush materials until the materials are qualified is achieved, on the basis, the qualified materials can be screened and collected in the treatment process and cannot be excessively crushed, the crushing efficiency of the device is improved, and the finished product percent of pass of the materials is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of battery negative electrode material processing, and in particular relates to a shaping device for high-pressure compacted negative electrode materials. Background Art

[0002] Graphite negative electrode material is the main body of lithium storage in lithium-ion batteries, allowing lithium ions to be embedded and released during the charge and discharge process. The negative electrode material mainly affects the initial efficiency and cycle performance of lithium batteries, and the performance of the negative electrode material also directly affects the performance of lithium batteries. Common negative electrode materials on the market include: soft carbon, hard carbon, aluminum-based alloys, transition metal oxides, artificial graphite, natural graphite, etc. At present, graphite composites have become a hot topic in the field of lithium-ion battery negative electrode materials due to their excellent cycle performance and high capacity characteristics, and are expected to replace graphite as a new generation of lithium-ion battery negative electrode materials. The preparation method of composite graphite and the selection of corresponding composite materials have an important influence on the morphology and electrochemical properties of the composite materials.

[0003] The main ingredients of composite graphite are generally graphite, pure water, and auxiliary materials. The process generally includes mixing the raw materials with additives, and then coating, bonding, carbonizing, etc. In order to improve the cycle stability and specific capacity of graphite negative electrode materials, the industry crushes graphite and shapes it into a spherical shape to improve the electrical properties of graphite. The equipment used in industry to crush and shape graphite is generally a micro-powder machine with a built-in grading wheel. However, the existing technology mostly uses several micro-powder machines in series to obtain qualified graphite micro-powder, which occupies a large space and has a low yield of finished products.

[0004] The document with authorization announcement number CN220592672U discloses a continuous shaping device for graphite micropowder materials, including: a volute shaping machine for shaping graphite micropowder materials; a collector for receiving materials after shaping by the volute shaping machine; and a circulation mechanism connected to the collector for circulating the materials in the collector into the volute shaping machine for radial circulation shaping.

[0005] However, the device still has the following problems: although the materials collected by the collector are all qualified intermediate materials screened by the grading wheel, the particle sizes of the micropowders in the materials are different. When the micropowders with fine particle sizes re-enter the shaping machine for circulation shaping together with the micropowders with larger particle sizes, the particle size of the micropowders with fine particle sizes is easily made smaller. For micropowders with too small particle sizes, the physical and chemical properties of graphite cannot be fully exerted, thereby affecting its value and effectiveness in practical applications. Summary of the invention

[0006] In response to the above-mentioned problems, the present invention provides a shaping device for high-pressure compacted negative electrode materials. Through the arrangement of a shaping machine, a screener and a circulator, a single shaping machine can cyclically crush materials until the materials are qualified. On this basis, qualified materials can be screened and collected during the processing process without over-crushing, which not only improves the crushing efficiency of the device, but also ensures the qualified rate of finished materials.

[0007] In order to achieve the above object, the technical solution of the present invention is as follows: A shaping device for high-pressure compaction negative electrode materials, comprising: A shaping machine, wherein a discharge port is arranged at the upper end of the shaping machine, and a feeding port and a recovery port are arranged at both side ends of the shaping machine; A sifter, wherein the upper and lower ends of the sifter are respectively provided with a feed port and a discharge port, a side end of the sifter is provided with a circulation port, and a sieve mesh docking with the circulation port is provided inside the sifter; The circulator includes a recovery pipe for connecting the discharge port and the feed port, a circulation pipe for connecting the recovery port and the circulation port, an exhaust fan arranged at the side end of the recovery pipe, and a valve body arranged on the circulation pipe.

[0008] As a further preferred embodiment of the present invention, the recovery pipe includes a horizontal pipe connected to the discharge port, and a vertical pipe connected to the feed port and connected to the side end of the horizontal pipe away from the discharge port; the end of the horizontal pipe away from the discharge port is connected to the exhaust fan, and a material blocking plate is arranged inside the horizontal pipe near the exhaust fan.

[0009] As a further preferred embodiment of the present invention, the circulator also includes a driving motor arranged on the outside of the vertical pipe, and a wind shielding plate connected to the driving motor and rotating through the space between the material blocking plate and the exhaust fan.

[0010] As a further preferred embodiment of the present invention, the screen is arranged obliquely, and its lower part is butted against the circulation port.

[0011] As a further preferred embodiment of the present invention, the wind shield includes a fixed plate connected to the driving motor, a closing plate and an elastic plate arranged at the same end of the fixed plate and in parallel; the maximum distance between the end of the elastic plate and the fixed plate is greater than the distance between the closing plate and the fixed plate, and the elastic plate acts on the screen while rotating through the screen.

[0012] As a further preferred embodiment of the present invention, the elastic plate includes an outer action plate arranged concentrically with the fixed plate, a fixed track arranged on the end of the fixed plate, a support plate arranged at the end of the outer action plate and slidably connected to the fixed track, and a spring arranged in the fixed track and used to support the support plate.

[0013] As a further preferred embodiment of the present invention, the elastic plate further includes two limit hole plates respectively arranged on the fixed plate and the outer action plate, and a limit rod 1 whose two ends are respectively slidably connected to the two limit hole plates and distributed radially.

[0014] As a further preferred embodiment of the present invention, the screen includes a fixed frame and a screening mesh body arranged on the fixed frame; the fixed frame has a cavity provided with a purge air path; the purge air path includes an input air pipe, a distribution air pipe connected to the input air pipe, and a plurality of air nozzles arranged on the distribution air pipe with the air outlet direction facing a higher position of the fixed frame.

[0015] As a further preferred embodiment of the present invention, the screen also includes a fixed block arranged on the inner wall of the screener at a higher point near the fixed frame, a vertical slide groove arranged on the fixed block and used to insert into the fixed frame, a limiting vertical rod arranged in the vertical slide groove and passing through the fixed frame, and a spring 2 which is sleeved on the limiting vertical rod and has two ends respectively connected to the side walls of the vertical slide groove and the fixed frame.

[0016] As a further preferred embodiment of the present invention, the screen also includes a ball disposed on a side end of the fixed frame and slidably connected to the vertical slide groove.

[0017] As a further preferred embodiment of the present invention, the end of the input air pipe has a plug; the screen also includes an opening arranged on the tube wall of the input air pipe near the plug, a sliding rod slidably connected to the opening and penetrating the fixed frame to extend to the upper end of the upper surface of the fixed frame, a sphere arranged inside the input air pipe near the plug, an extrusion block arranged on the end of the sliding rod located in the input air pipe and acting on the sphere, an extension plate arranged on the end of the sliding rod located on the upper surface of the fixed frame, an opening arranged on the extension plate, a limiting rod 2 arranged on the upper surface of the fixed frame and passing through the opening, and a spring 3 which is sleeved on the limiting rod 2 and has one end connected to the upper surface of the fixed frame and the other end connected to the extension plate.

[0018] As a further preferred embodiment of the present invention, the screen also includes a connecting rope for connecting the extrusion block and the sphere.

[0019] As a further preferred embodiment of the present invention, a limiting protrusion is provided on the inner wall of the end of the distribution air pipe close to the input air pipe.

[0020] The beneficial effects of the present invention are as follows: The shaping device provided by the present invention is connected to the shaping machine through a screener and a circulator. The shaping machine can cyclically crush the material until the material is qualified. In addition, during the circulation process, the screener can collect and discharge the qualified material to avoid the material being crushed too small to affect the physical and chemical properties of the graphite. The yield of the material processed by the shaping device can reach more than 92%, and the particle size distribution range of the material is controlled within ±1.0μm, which can help improve the capacity and compaction performance of the graphite and solve the problems of poor rate performance and poor circulation performance of graphite. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Attached Figure 1 It is a schematic diagram of the structure of the present invention at the main viewing angle.

[0022] Attached Figure 2 It is a schematic diagram of the internal structure of the screener and circulator of the present invention.

[0023] Attached Figure 3 It is a schematic diagram of the connection structure between the screen and the inner wall of the sifter of the present invention.

[0024] Attached Figure 4 It is a schematic structural diagram of the wind shield of the present invention.

[0025] Attached Figure 5 It is a schematic diagram of the three-dimensional structure of the wind shield of the present invention.

[0026] Attached Figure 6 It is a schematic diagram of the structure of the screen of the present invention.

[0027] Attached Figure 7 It is a schematic diagram of the process structure of the purge gas circuit of the present invention.

[0028] Description of the drawings: shaping machine 1, sifter 2, circulator 3; Discharge port 11, feeding port 12, recovery port 13; Feed port 21, discharge port 22, circulation port 23, screen 24; Fixed frame 241, screening mesh body 242, fixed block 244, vertical slide 245, limit vertical rod 246, spring 247, ball 248; Input air pipe 243a, distribution air pipe 243b, air nozzle 243c, limiting protrusion 243d; Opening 249a, sliding rod 249b, sphere 249c, extrusion block 249d, extension plate 249e, opening 249f, limiting rod 249g, spring 3 249h, connecting rope 249i; Recovery pipeline 31, circulation pipeline 32, exhaust fan 33, valve body 34, drive motor 35, wind shield 36; Horizontal tube 311, vertical tube 312, material blocking plate 313; Fixed plate 361, closing plate 362, elastic plate 363; External action plate 363a, fixed rail 363b, support plate 363c, spring 1 363d, limiting hole plate 363e, limiting rod 1 363f. DETAILED DESCRIPTION

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms such as "setting" and "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection: it can be a mechanical connection or an electrical connection: it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Example 1 The present invention provides a shaping device for high-pressure compaction negative electrode materials, comprising: A shaping machine 1, wherein a discharge port 11 is disposed at the upper end of the shaping machine 1, and a feeding port 12 and a recovery port 13 are disposed at both side ends of the shaping machine 1; A sifter 2, wherein the upper and lower ends of the sifter 2 are respectively provided with a feed port 21 and a discharge port 22, a side end of the sifter 2 is provided with a circulation port 23, and a sieve 24 is provided inside the sifter 2 to be connected with the circulation port 23; The circulator 3 includes a recovery pipe 31 for connecting the discharge port 11 and the feed port 21, a circulation pipe 32 for connecting the recovery port 13 and the circulation port 23, an exhaust fan 33 arranged at the side end of the recovery pipe 31, and a valve body 34 arranged on the circulation pipe 32.

[0032] Among them, the shaping machine 1 adopts the existing air flow crushing equipment. By feeding the material into the lower part of the shaping machine 1 through the feeding port 12, the high-pressure airflow crushes the material and transports the crushed material to the grading impeller on the upper end of the equipment. The grading impeller discharges the material with a qualified particle size through the discharge port 11; the screener 2 inputs the material discharged through the discharge port 11 into the screener 2 through the recovery pipe 31, and the qualified material passes through the screen 24 and falls to the lower part of the screener 2 and is discharged through the discharge port 22. The unqualified material is discharged through the circulation port 23, and the material is re-input into the screener 2 by the circulation pipe 32 for crushing. Furthermore, the exhaust fan 33 is used to suck the material discharged through the discharge port 11, providing sufficient power to ensure that the material can be quickly transported to the screener 2; the valve body 34 can control the opening and closing of the circulation pipeline 32, and a sensing element can also be set at the valve body 34 to detect the amount of material passing through the circulation pipeline 32; a control valve can also be set at the discharge port 22 to control the discharge of qualified materials.

[0033] It is worth noting that the grading impeller can control the particle size of the material discharged from the discharge port 11 by the rotation speed. Therefore, when the material circulates through the circulator 3, the rotation speed of the grading impeller can be gradually increased so that the particle size of the material discharged from the discharge port 11 gradually becomes smaller. When the cycle is about 3 to 5 times, the yield of the device can reach more than 92%, and the particle size distribution range of the material is controlled within ±1.0μm, which can help improve the capacity and compaction performance of graphite, and solve the problems of poor graphite rate performance and poor circulation performance.

[0034] As a further preferred embodiment of the present invention, the screen 24 is arranged obliquely, and its lower part is butted against the circulation port 23. Such arrangement helps to improve the screening efficiency of the material.

[0035] As a further preference of this embodiment, the recovery pipe 31 includes a transverse pipe 311 connected to the discharge port 11, and a vertical pipe 312 connected to the feed port 21 and connected to the side end of the transverse pipe 311 away from the discharge port 11; the end of the transverse pipe 311 away from the discharge port 11 is connected to the exhaust fan 33, and a material blocking plate 313 is arranged inside the transverse pipe 311 near the exhaust fan 33. Among them, the lower end of the end of the transverse tube 311 connected to the exhaust fan 33 is connected to the vertical tube 312, the material blocking plate 313 can be a sieve, and the screening size of the grid must be smaller than the minimum particle size of the material to ensure that the material will not enter the exhaust fan 33 through the material blocking plate 313, the material blocking plate 313 preferably covers the inner diameter of the entire transverse tube 311, the material blocking plate 313 is connected to the inner top wall of the transverse tube 311, and the lower end of the material blocking plate 313 can extend into the vertical tube 312 and be parallel to the inner wall of the vertical tube 312; after the material is blocked by the material blocking plate 313, the material falls from the vertical tube 312 into the sifter 2 under the action of gravity.

[0036] Considering that the material is easily accumulated on the material blocking plate 313 due to the suction force of the exhaust fan 33, thereby reducing the feeding speed of the screener 2. Therefore, this embodiment further optimizes the structure of the circulator 3, specifically including: the circulator 3 also includes a driving motor 35 arranged on the outside of the vertical pipe 312, and a wind shield 36 connected to the driving motor 35 and rotating through the space between the material blocking plate 313 and the exhaust fan 33. Among them, the driving motor 35 is installed on the outside of the vertical pipe 312, and the output shaft of the motor enters the vertical pipe 312 through a sealing connector, and the sealing connector is a conventional choice in the field; the wind shield 36 is preferably fan-shaped, and a mounting hole connected to the output end of the driving motor 35 is provided near the center. The length of the wind shield 36 is equivalent to the inner diameter of the horizontal pipe 311. Therefore, the wind shield 36 is driven by the driving motor 35 and repeatedly enters and exits the horizontal pipe 311 and the vertical pipe 312; when the wind shield 36 rotates and enters the material blocking plate 313 and the exhaust fan 3 3, the wind shield 36 is parallel to the material blocking plate 313, and partially or completely blocks the air intake of the exhaust fan 33, thereby reducing the wind force of the sucked material. The material falls directly into the vertical pipe 312 under the action of gravity, and when the wind shield 36 rotates to leave the horizontal pipe 311, the wind force in the horizontal pipe 311 is restored to the strength of sucking the material. Finally, during the reciprocating rotation of the wind shield 36, the material is sucked and quickly falls into the sifter 2, which ensures the feeding speed at the sifter 2 and does not cause blockage of the material in the device.

[0037] As a further preferred embodiment of the present invention, the wind shielding plate 36 includes a fixed plate 361 connected to the driving motor 35, a closing plate 362 and an elastic plate 363 arranged at the same end of the fixed plate 361 and arranged in parallel; the maximum distance between the end of the elastic plate 363 and the fixed plate 361 is greater than the distance between the closing plate 362 and the fixed plate 361, and the elastic plate 363 acts on the screen 24 while rotating through the screen 24. Among them, "the maximum distance between the end of the elastic plate 363 and the fixed plate 361 is greater than the distance between the closing plate 362 and the fixed plate 361" means that the length of the elastic plate 363 is greater than the length of the closing plate 362; the closing plate 362 is close to the exhaust fan 33 side, and the elastic plate 363 is far away from the exhaust fan 33 side. The closing plate 362 can partially block the exhaust fan 33, and the elastic plate 363 can supplement the air leakage of the closing plate 362. More importantly, the end of the elastic plate 363 has the function of radial expansion and contraction. When the wind shield plate 36 enters the vertical tube 312, the length of the elastic plate 363 is sufficient to contact the upper surface of the screen 24 and act on the screen 24. After the elastic plate 363 leaves, the screen 24 returns to its original state. Therefore, during the cyclic rotation of the elastic plate 363, the screen 24 is vibrated by the intermittent action of the elastic plate 363, thereby promoting the screening effect of the screen 24.

[0038] As a further preferred embodiment of the present invention, the screen 24 includes a fixed frame 241, a screening mesh body 242 arranged on the fixed frame 241, a fixed block 244 arranged on the inner wall of the sifter 2 near the higher part of the fixed frame 241, a vertical slide 245 arranged on the fixed block 244 and used to be inserted into the fixed frame 241, a limit vertical rod 246 arranged in the vertical slide 245 and passing through the fixed frame 241, and a second spring 247 sleeved on the limit vertical rod 246 and having two ends respectively connected to the groove side wall of the vertical slide 245 and the fixed frame 241. The working principle of the screen 24 is as follows: when the elastic plate 363 acts on the fixed frame 241, the fixed frame 241 moves downward along the direction specified by the limit vertical rod 246 and compresses the second spring 247, and when the elastic plate 363 leaves, the second spring 247 lifts the fixed frame 241 to return to its original position. The advantage of such a configuration is that the amplitude of the screen 24 when the elastic plate 363 acts on the screen 24 can be enlarged, thereby further improving the screening effect.

[0039] As a further preferred embodiment of the present invention, the screen 24 further comprises a ball 248 disposed on a side end of the fixing frame 241 and slidably connected to the vertical slide groove 245. This arrangement is used to improve the smoothness of the movement of the fixing frame 241 in the vertical slide groove 245.

[0040] As a further preferred embodiment of the present invention, the elastic plate 363 includes an outer action plate 363a disposed concentrically with the fixed plate 361, a fixed track 363b disposed at the end of the fixed plate 361, a support plate 363c disposed at the end of the outer action plate 363a and slidably connected to the fixed track 363b, and a spring 363d disposed in the fixed track 363b and used to support the support plate 363c. Furthermore, the elastic plate 363 also includes two stopper orifice plates 363e disposed on the fixed plate 361 and the outer action plate 363a, respectively, and a stopper rod 363f having two ends respectively slidably connected to the two stopper orifice plates 363e and distributed radially.

[0041] Among them, the outer action plate 363a is an arc-shaped plate, the fixed rails 363b are two fixed plates with sliding grooves arranged at the two ends of the fixed plate 361, and the support plates 363c are two fixed plates with sliding blocks arranged at the two ends of the outer action plate 363a, and the sliding blocks slide in the sliding grooves to realize the sliding connection between the outer action plate 363a and the fixed plate 361; in order to further improve the stability of the sliding connection, a limit rod passing through the sliding block can be arranged in the sliding groove, and the spring 363d is sleeved on the limit rod and one end is connected to the inner wall of the sliding groove and the other end is connected to the sliding block to improve the supporting effect of the sliding block and ensure that the outer action plate 363a returns to its original position without pressure. The outermost end of the outer action plate 363a in its original position is located on the outside of the outermost end of the fixed plate 361, and the outer action plate 363a partially overlaps with the fixed plate 361 to ensure the effect of blocking the air duct.

[0042] Example 2 This embodiment optimizes the structure of the screen based on the embodiment 1, as follows: The fixed frame 241 has a cavity with a purge air path therein; the purge air path includes an input air pipe 243a, a distribution air pipe 243b connected to the input air pipe 243a, and a plurality of air nozzles 243c arranged on the distribution air pipe 243b and with the air outlet direction facing a higher position of the fixed frame 241.

[0043] It can be understood that the end of the input gas path 243a away from the distribution gas pipe 243b is connected to an external air pump, and the air pump is used to output pressurized gas. The gas is transported to each gas nozzle 243c through the distribution gas pipe 243b and sprayed out. Since the opening of the gas nozzle 243c is toward the high point of the fixed frame 241, the gas sprayed through the gas nozzle 243c blows the material in the opposite direction of the material's sliding, which not only promotes the spreading of the material, but also extends the movement path of the material in the screening mesh 242, thereby ensuring the sufficient screening effect of the screen 24.

[0044] Example 3 This embodiment optimizes the structure of the screen based on the embodiment 2, as follows: The end of the input air pipe 243a has a plug; the screen 24 also includes an opening 249a arranged on the pipe wall of the input air pipe 243a near the plug, a sliding rod 249b slidably connected to the opening 249a and penetrating the fixed frame 241 to extend to the upper end of the upper surface of the fixed frame 241, a sphere 249c arranged inside the input air pipe 243a near the plug, an extrusion block 249d arranged on the end of the sliding rod 249b located in the input air pipe 243a and acting on the sphere 249c, and a sliding rod 249b arranged at the end of the sliding rod 249b located in the input air pipe 243a. An extension plate 249e on the end of the upper surface of the fixed frame 241, an opening 249f arranged on the extension plate 249e, a limiting rod 249g arranged on the upper surface of the fixed frame 241 and passing through the opening 249f, a spring 249h which is sleeved on the limiting rod 249g and connected to the upper surface of the fixed frame 241 at one end and connected to the extension plate 249e at the other end, and a connecting rope 249i for connecting the extrusion block 249d and the sphere 249c; wherein a limiting protrusion 243d is provided on the inner wall of the end of the distribution air pipe 243b close to the input air pipe 243a.

[0045] There is a space between the connection port of the input air pipe 243a and the distribution air pipe 243b and the plug of the input air pipe 243a that can accommodate the ball 249c and the extrusion block 249d, and the opening 249c is also arranged in the space. The side of the extrusion block 249d close to the ball 249c is an inclined surface, and has the function of pressing down the ball 249c; the extension plate 249e is a horizontal plate, and extends to the rotation path of the elastic plate 363. When the elastic plate 363 rotates to the screen 24, the elastic plate 363 presses down the extension plate 249e, pushes the sliding rod 249b to move into the input air pipe 243a, and the extrusion block 249d squeezes the ball 249c to move to the connection port between the input air pipe 243a and the distribution air pipe 243b, partially or completely blocking the connection port, thereby reducing the flow in the air pipe; when the elastic plate 363 rotates away, the spring 3 249h supports and lifts the extension plate 249e, the extrusion block 249d moves upward, the connecting rope 249i pulls the ball 249c away from the connection port, and the flow of the distribution air pipe 243b is restored to the maximum, and the above process is cyclic with the rotation of the elastic plate 363. The advantage of this arrangement is that the air nozzle 243c can intermittently jet, which not only promotes the screening effect of the material, but also does not excessively hinder the discharge of the material, thereby promoting the circulation rate of the material.

[0046] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A shaping device for high-pressure negative electrode materials, characterized in that: include: A shaping machine (1), wherein a discharge port (11) is provided at the upper end of the shaping machine (1), and a feeding port (12) and a recovery port (13) are respectively provided at both side ends of the shaping machine (1); A sifter (2), wherein the sifter (2) is provided with a feed port (21) and a discharge port (22) at the upper and lower ends respectively, a circulation port (23) is provided at the side end of the sifter (2), and a sieve (24) is provided inside the sifter (2) and is connected to the circulation port (23); The circulator (3) comprises a recovery pipe (31) for connecting the discharge port (11) and the feed port (21), a circulation pipe (32) for connecting the recovery port (13) and the circulation port (23), an exhaust fan (33) arranged at a side end of the recovery pipe (31), and a valve body (34) arranged on the circulation pipe (32).

2. A shaping device for high-density negative electrode materials according to claim 1, characterized in that: The recovery pipe (31) comprises a transverse pipe (311) connected to the discharge port (11), and a vertical pipe (312) connected to the feed port (21) and in communication with a side end of the transverse pipe (311) away from the discharge port (11); an end of the transverse pipe (311) away from the discharge port (11) is connected to the exhaust fan (33), and a material blocking plate (313) is provided inside the transverse pipe (311) close to the exhaust fan (33).

3. A shaping device for high-density negative electrode materials according to claim 2, characterized in that: The circulator (3) further comprises a driving motor (35) arranged outside the vertical pipe (312), and a wind shielding plate (36) connected to the driving motor (35) and rotating through the space between the material blocking plate (313) and the exhaust fan (33).

4. A shaping device for high-density negative electrode materials according to claim 3, characterized in that: The screen (24) is arranged at an inclination, and its lower part is butted against the circulation port (23).

5. A shaping device for high-density negative electrode materials according to claim 4, characterized in that: The wind shield plate (36) comprises a fixed plate (361) connected to the drive motor (35), a closing plate (362) and an elastic plate (363) arranged at the same end of the fixed plate (361) and arranged in parallel; the maximum distance between the end of the elastic plate (363) and the fixed plate (361) is greater than the distance between the closing plate (362) and the fixed plate (361), and the elastic plate (363) acts on the screen (24) while rotating through the screen (24).

6. A shaping device for high-density negative electrode materials according to claim 5, characterized in that: The elastic plate (363) comprises an outer action plate (363a) arranged concentrically with the fixed plate (361), a fixed track (363b) arranged on the end of the fixed plate (361), a support plate (363c) arranged at the end of the outer action plate (363a) and slidably connected to the fixed track (363b), and a spring (363d) arranged in the fixed track (363b) and used to support the support plate (363c).

7. A shaping device for high-density negative electrode materials according to claim 6, characterized in that: The elastic plate (363) further comprises two limiting orifice plates (363e) respectively arranged on the fixing plate (361) and the outer action plate (363a), and a limiting rod (363f) having two ends respectively slidably connected to the two limiting orifice plates (363e) and distributed in the radial direction.

8. The high-density negative electrode material shaping device according to claim 5, characterized in that: The screen (24) comprises a fixed frame (241) and a screening mesh body (242) arranged on the fixed frame (241); the fixed frame (241) has a cavity provided with a purge air path; the purge air path comprises an input air pipe (243a), a distribution air pipe (243b) connected to the input air pipe (243a), and a plurality of air nozzles (243c) arranged at a higher position on the distribution air pipe (243b) with the air outlet direction facing the fixed frame (241).

9. A shaping device for high-density negative electrode materials according to claim 8, characterized in that: The screen (24) further comprises a fixed block (244) arranged on the inner wall of the screener (2) at a higher position near the fixed frame (241), a vertical slide groove (245) arranged on the fixed block (244) and used for inserting into the fixed frame (241), a limiting vertical rod (246) arranged in the vertical slide groove (245) and passing through the fixed frame (241), and a second spring (247) sleeved on the limiting vertical rod (246) and having two ends respectively connected to the groove side walls of the vertical slide groove (245) and the fixed frame (241).

10. A shaping device for high-density negative electrode materials according to claim 9, characterized in that: The screen (24) further comprises a ball (248) arranged on a side end of the fixing frame (241) and slidably connected to the vertical sliding groove (245).

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