A pipeline continuous powder mixing device for preparing a positive electrode material

Abstract

The application discloses a pipeline continuous powder mixing device for preparing a positive electrode material, which comprises a fan, a stock bin, a dust collector, an air draught fan, a material collecting cylinder, a mixing device and a stirring device. The mixing device comprises connecting pipelines and at least two mixing chambers. The connecting pipelines are connected with the mixing chambers. The stirring device comprises stirring blade rods, gear transmission rods and a motor. Two stirring blade rods are arranged. The two blade stirring rods are respectively connected with two ends of the gear transmission rods. The two stirring blade rods are respectively inserted into one mixing chamber. The gear transmission rods and the motor shaft of the motor are respectively provided with bevel gears. The bevel gears of the two are matched at 90 DEG. The inlet of the connecting pipeline is connected with the fan and the stock bin. The outlet is connected with the dust collector. The top outlet of the dust collector is connected with the air draught fan. The bottom is connected with the material collecting cylinder. Compared with the existing high-speed mixer mixing technology and the pipeline static mixing technology, the application can increase the collision strength and the mixing efficiency among the positive electrode materials.

Description

Technical Field

[0001] This invention relates to the field of powder mixing technology, and in particular to a pipeline continuous powder mixing device for preparing cathode materials. Background Technology

[0002] Mixing of cathode materials is crucial for their effective preparation. Currently, most methods for mixing cathode materials employ a single mechanical stirring element. Mechanical stirring mainly utilizes the radial, axial, and tangential flows generated by rotating components to achieve cyclic mixing. However, single-element mechanical stirring suffers from unresolved problems such as small interparticle gaps, easy agglomeration, poor dispersibility, and severe heat generation during prolonged stirring, all of which negatively impact the quality of the prepared cathode materials. Furthermore, mechanical stirring typically involves batch mixing, which cannot be performed continuously, making it impossible to precisely control the material concentration and flow rate, and thus failing to meet the mixing requirements of cathode materials under complex conditions.

[0003] While pipeline static mixers offer good continuous mixing performance, their complex internal structure, numerous blades, and inconvenient installation, coupled with the potential for excessive pressure loss and material blockage, result in low overall efficiency.

[0004] In view of this, a pipeline continuous powder mixing device for the preparation of cathode materials is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a continuous pipeline powder mixing device for preparing cathode materials, which can increase the collision intensity and mixing efficiency between cathode materials.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] A continuous pipeline powder mixing device for preparing cathode materials includes a fan, a silo, a dust collector, an induced draft fan, a receiving cylinder, a mixing device, and a stirring device. The mixing device includes a connecting pipeline and at least two mixing chambers. The connecting pipeline connects to the mixing chambers. The stirring device includes stirring blades, a gear transmission rod, and a motor. Two stirring blades are provided, each connected to one end of the gear transmission rod. Each stirring blade is inserted into one of the mixing chambers. The gear transmission rod and the motor shaft of the motor are respectively provided with bevel gears, and the bevel gears are engaged at 90°. The inlet of the connecting pipeline connects to the fan and the silo, and the outlet connects to the dust collector. The top outlet of the dust collector is connected to the induced draft fan, and the bottom is connected to the receiving cylinder.

[0008] In a preferred embodiment, the stirring device further includes an airflow sealing end cap, an airflow sealing chamber, and a bearing corresponding to the stirring blade rod. The airflow sealing chamber is disposed on the stirring blade rod, and a small hole is opened at the bottom of the airflow sealing chamber. The airflow sealing end cap is disposed at the top of the airflow sealing chamber, and the bearing is installed in the airflow sealing chamber for cooperating with the stirring blade rod.

[0009] In a preferred embodiment, the stirring device further includes a large sealing ring and a small sealing ring, which are respectively located at the outer ring and inner ring positions of the bearing.

[0010] In a preferred embodiment, the stirring blade rod has 2-10 layers of blades, with 2-5 blades in each layer.

[0011] In a preferred embodiment, the connecting pipes include a first feed pipe, a second feed pipe, a first diversion pipe, a second diversion pipe, and a discharge pipe. The mixing chamber includes a first-stage mixing chamber, a second-stage mixing chamber, a third-stage mixing chamber, a first nozzle, a second nozzle, and a third nozzle. Two of each of the first and second diversion pipes are provided. The outlets of the first and second feed pipes are respectively connected to two first nozzles. The two first nozzles are respectively connected to the first-stage mixing chamber. The inlets of the two first diversion pipes are connected to the first-stage mixing chamber, and their outlets are respectively connected to two second nozzles. The two second nozzles are respectively connected to the second-stage mixing chamber. The inlets of the two second diversion pipes are connected to the second-stage mixing chamber, and their outlets are connected to two third nozzles. The two third nozzles are connected to the third-stage mixing chamber. The outlet of the third-stage mixing chamber is connected to the inlet of the discharge pipe. Two stirring blade rods are respectively inserted into the first-stage mixing chamber and the second-stage mixing chamber.

[0012] In a preferred embodiment, the first feed pipe and the second feed pipe are respectively provided with a first blade, and the first diversion pipe is provided with a second blade. The first blade and the second blade are configured as a spiral. The first blades in the first feed pipe and the second feed pipe have the same spiral direction, and the second blades in the two first diversion pipes have the same spiral direction.

[0013] In a preferred embodiment, the spiral diameter of the first blade and the second blade ranges from 20 to 200 mm, the pitch ranges from 20 to 100 mm, and the number of twists is 0.5 turns.

[0014] In a preferred embodiment, the first feed pipe and the second feed pipe are configured as circular pipes with a diameter ranging from 20 to 200 mm. The first feed pipe and the second feed pipe include a straight pipe, a bend, a straight pipe, a bend, and a straight pipe connected in sequence. The length of the straight pipe ranges from 40 to 500 mm, and the bending angle of the bend ranges from 30° to 160°.

[0015] In a preferred embodiment, the first nozzle, the second nozzle, and the third nozzle are configured as gradually converging pipes with a converging angle ranging from 10° to 60°, an inlet diameter ranging from 20 to 200 mm, and an outlet diameter ranging from 5 to 30 mm.

[0016] In a preferred embodiment, the first-stage mixing chamber and the second-stage mixing chamber are configured as hollow spherical structures with a diameter range of 40-300 mm, and the third mixing chamber is configured as a cylindrical structure with cone angles at the top and bottom, the cone angles being ranged from 10° to 45° and the diameter being ranged from 40-300 mm.

[0017] Compared with the prior art, the present invention provides a continuous pipeline powder mixing device for preparing cathode materials, which has the following advantages: 1. Gas is used to drive the raw materials of cathode materials to collide and mix in the pipeline, which increases the collision intensity and mixing efficiency between raw material particles; 2. Blades are used for dispersion and mixing, which reduces the energy consumption of the system while meeting the requirements of mixing uniformity; 3. The main components are made of non-metallic materials, which avoids the contamination of the cathode material raw materials by metallic impurities during violent collisions. Attached Figure Description

[0018] Figure 1 This invention relates to a schematic diagram of the mixing device structure of a pipeline continuous powder mixing device for preparing positive electrode materials.

[0019] Figure 2 This is a full front sectional view of the mixing device of a pipeline continuous powder mixing device for preparing positive electrode materials, which is the present invention.

[0020] Figure 3 This is a full sectional side view of the mixing device of a pipeline continuous powder mixing device for preparing positive electrode materials, which is an invention of the present invention.

[0021] Figure 4 This invention relates to a schematic diagram of the stirring device of a pipeline continuous powder mixing device for preparing positive electrode materials.

[0022] Figure 5 This is a cross-sectional view of the stirring device of a pipeline continuous powder mixing device for preparing positive electrode materials, which is an invention of the present invention.

[0023] Figure 6This invention relates to a schematic diagram of the structure of the first and second blades of a continuous powder mixing device for preparing cathode materials.

[0024] Figure 7 This invention relates to a schematic diagram of the structure of a pipeline continuous powder mixing device for preparing positive electrode materials.

[0025] In the picture

[0026] 1. First feed pipe; 2. Second feed pipe; 3. First mixing chamber; 4. First diversion pipe; 5. Second mixing chamber; 6. Second diversion pipe; 7. Third mixing chamber; 8. Drop pipe; 9. First blade; 10. First nozzle; 11. Second blade; 12. Second nozzle; 13. Third nozzle; 14. Stirring device; 141. Stirring blade rod; 142. Airflow sealing end cap; 143. Airflow sealing chamber; 144. Motor; 145. Gear transmission rod; 146. Large sealing ring; 147. Small sealing ring; 148. Bearing; 15. Mixing device; 16. Fan; 17. Hopper; 18. Dust collector; 19. Exhaust fan; 20. Collection cylinder. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0029] A continuous pipeline powder mixing device for preparing cathode materials includes a fan, a silo, a dust collector, an induced draft fan, a receiving cylinder, a mixing device, and a stirring device. The mixing device includes a connecting pipeline and at least two mixing chambers. The connecting pipeline connects to the mixing chambers. The stirring device includes stirring blades, a gear transmission rod, and a motor. Two stirring blades are provided, each connected to one end of the gear transmission rod. Each stirring blade is inserted into one of the mixing chambers. The gear transmission rod and the motor shaft of the motor are respectively provided with bevel gears, and the bevel gears are engaged at 90°. The inlet of the connecting pipeline connects to the fan and the silo, and the outlet connects to the dust collector. The top outlet of the dust collector is connected to the induced draft fan, and the bottom is connected to the receiving cylinder.

[0030] The continuous pipeline powder mixing device for preparing cathode materials according to this embodiment has the following advantages: 1. Gas is used to drive the raw materials of cathode materials to collide and mix in the pipeline, which increases the collision intensity and mixing efficiency between raw material particles; 2. Blades are used for dispersion and mixing, which reduces the energy consumption of the system while meeting the requirements of mixing uniformity; 3. The main components are made of non-metallic materials, which avoids the contamination of the cathode material raw materials by metallic impurities during violent collisions.

[0031] Furthermore, the stirring device also includes an airflow sealing end cap, an airflow sealing chamber, and a bearing corresponding to the stirring blade rod. The airflow sealing chamber is located on the stirring blade rod, and a small hole is opened at the bottom of the airflow sealing chamber. The airflow sealing end cap is located at the top of the airflow sealing chamber, and the bearing is installed in the airflow sealing chamber for cooperating with the stirring blade rod.

[0032] Furthermore, the stirring device also includes a large sealing ring and a small sealing ring, which are respectively located on the outer ring and inner ring of the bearing.

[0033] Furthermore, the stirring blade rod has 2-10 layers of blades, with 2-5 blades in each layer.

[0034] Furthermore, the connecting pipes include a first feed pipe, a second feed pipe, a first diversion pipe, a second diversion pipe, and a discharge pipe. The mixing chamber includes a first-stage mixing chamber, a second-stage mixing chamber, a third-stage mixing chamber, a first nozzle, a second nozzle, and a third nozzle. Each of the first diversion pipe, the second diversion pipe, the first nozzle, the second nozzle, and the third nozzle has two parts. The outlets of the first feed pipe and the second feed pipe are respectively connected to the two first nozzles. The two first nozzles are respectively connected to the first-stage mixing chamber. The inlets of the two first diversion pipes are connected to the first-stage mixing chamber, and their outlets are respectively connected to the two second nozzles. The two second nozzles are respectively connected to the second-stage mixing chamber. The inlets of the two second diversion pipes are connected to the second-stage mixing chamber, and their outlets are connected to the two third nozzles. The two third nozzles are connected to the third-stage mixing chamber. The outlet of the third stage is connected to the inlet of the discharge pipe. The two stirring blade rods are respectively inserted into the first-stage mixing chamber and the second-stage mixing chamber.

[0035] Furthermore, the first feed pipe and the second feed pipe are respectively provided with a first blade, and the first diversion pipe is provided with a second blade. The first blade and the second blade are spirally arranged. The first blades in the first feed pipe and the second feed pipe have the same spiral direction, and the second blades in the two first diversion pipes have the same spiral direction.

[0036] Furthermore, the spiral diameter of the first blade and the second blade ranges from 20 to 200 mm, the pitch ranges from 20 to 100 mm, and the number of twists is 0.5 turns, thereby achieving gas-solid dispersion of precursor powder materials and lithium battery powder materials, as well as shear mixing of precursor powder materials and lithium battery powder materials.

[0037] Furthermore, the first and second feed pipes are configured as circular pipes with a diameter ranging from 20 to 200 mm. The first and second feed pipes include a straight pipe, a bend, a straight pipe, a bend, and a straight pipe connected in sequence. The length of the straight pipe ranges from 40 to 500 mm, and the bending angle of the bend ranges from 30° to 160°. Gas-solid feeding is achieved through the action of airflow, with an airflow velocity ranging from 2 to 20 m / s and a solid-to-gas ratio of 2 to 20.

[0038] Furthermore, the first nozzle, the second nozzle, and the third nozzle are configured as gradually converging pipes with a converging angle ranging from 10° to 60°, an inlet diameter ranging from 20 to 200 mm, and an outlet diameter ranging from 5 to 30 mm.

[0039] Furthermore, the first and second stage mixing chambers are hollow spherical structures with a diameter ranging from 40 to 300 mm to achieve strong turbulent gas-solid collision. Four ports with diameters ranging from 20 to 200 mm are evenly arranged on the front, back, left, and right sides. Two inlets connect to the nozzle outlet, and two outlets connect to the inlet of the distributor pipe. The third mixing chamber is a cylindrical structure with conical angles at the top and bottom, ranging from 10° to 45°, and a diameter ranging from 40 to 300 mm, to achieve gas-solid diffusion collision. The third stage mixing chamber has two inlets on its sides with diameters ranging from 5 to 30 mm for connecting to the nozzle outlet, and one outlet at the bottom with a diameter ranging from 30 to 250 mm for connecting to the discharge pipe.

[0040] The first and second diversion pipes are circular pipes with a diameter ranging from 20 to 200 mm. They are composed of multiple straight pipes and bends, connected in the following order: straight pipe, bend, straight pipe, bend, and straight pipe. The length of the straight pipe ranges from 40 to 500 mm, and the bending angle of the bend ranges from 30° to 160°. They are used for the diversion and transportation of the mixed precursor powder material and lithium battery powder material.

[0041] The discharge pipe is a circular pipe with a diameter ranging from 30 to 250 mm. It consists of two straight pipe sections and one bent pipe section, connected in the following order: straight pipe, bent pipe, straight pipe. The angle of the bent pipe is 90°. The diameter of the discharge pipe at the inlet and outlet of the third-stage mixing chamber is the largest in the entire device, ensuring that the mixed material can be discharged uniformly and stably.

[0042] To provide a more detailed description of the continuous powder mixing device for preparing cathode materials according to this embodiment, the following embodiment is provided in conjunction with the accompanying drawings:

[0043] Example 1:

[0044] A continuous pipeline powder mixing device for preparing cathode materials includes: a first feed pipe 1; a second feed pipe 2; a first-stage mixing chamber 3; a first diversion pipe 4; a second-stage mixing chamber 5; a second diversion pipe 6; a third-stage mixing chamber 7; a discharge pipe 8; a first blade 9; a first nozzle 10; a second blade 11; a second nozzle 12; a third nozzle 13; a stirring device 14; a stirring blade rod 141; an airflow sealing end cap 142; an airflow sealing chamber 143; a motor 144; a gear transmission rod 145; a large sealing ring 146; a small sealing ring 147; a bearing 148; a mixing device 15; a fan 16; a hopper 17; a dust collector 18; an induced draft fan 19; and a receiving cylinder 20.

[0045] In this embodiment, the outlet of the blower 16 is connected to the outlet of the silo 17 and the inlet of the continuous mixing device 15 in the pipeline to realize pneumatic feeding.

[0046] The outlets of the first feed pipe 1 and the second feed pipe 2 of the pipeline mixing device are bonded to the inlets of two first nozzles 10, respectively. A stationary first blade 9 with the same direction of rotation is installed inside the first feed pipe 1 and the second feed pipe 2 near their outlets. The outlets of the first nozzles 10 are connected to the left and right inlets of the first-stage mixing chamber 3 via flanges.

[0047] The two outlets of the first-stage mixing chamber 3 are connected to the inlets of the two first diversion pipes via flanges. Each of the two first diversion pipes 4 has a stationary second blade 11 with the same direction of rotation installed at the middle position inside. The outlets of the two first diversion pipes 4 are bonded to the inlets of the two second nozzles 12.

[0048] The outlets of the two second nozzles 12 are connected to the two inlets of the second-stage mixing chamber 5 via flanges, and the two outlets of the second-stage mixing chamber 5 are connected to the inlets of the two second diversion pipes 6 via flanges. The outlets of the two second diversion pipes 6 are bonded to the inlets of the two third nozzles 13, and the outlets of the two third nozzles 13 are connected to the inlet of the third-stage mixing chamber 7 via flanges.

[0049] The stirring device 14 has a symmetrical structure and mainly consists of a stirring blade rod 141, an airflow sealing end cap 142, an airflow sealing chamber 143, a gear transmission rod 145, a motor 144, a bearing 148, a large sealing ring 146, and a small sealing ring 147. The stirring device 14 is connected to the bottom of the first-stage mixing chamber 3 and the top of the second-stage mixing chamber 5 via flanges. The stirring blade rod 141 extends into the first-stage mixing chamber 3 and the second-stage mixing chamber 5 and is connected to the bearing 148, which is installed inside the airflow sealing chamber 143. The outer and inner rings of the bearing 148 are fixed by the large sealing ring 146 and the small sealing ring 147, respectively, to prevent axial movement. An airflow sealing end cap 142 is installed on the top of the airflow sealing chamber 143. A small hole is opened at the bottom of the airflow sealing chamber 143 to allow airflow to enter and prevent dust from entering the interior of the stirring device 14. A bevel gear is installed in the middle of the gear transmission rod 145, which is installed at 90° with the bevel gear on the motor 144. The upper and lower ends of the gear transmission rod 145 are connected to the stirring blade rod 141 by threads or pins to realize the transmission of power.

[0050] The outlet of the third-stage mixing chamber 7 is threadedly connected to the inlet of the discharge pipe 8.

[0051] The outlet of the third-stage mixing chamber 7 of the mixing device 15 is connected to the inlet of the dust collector 18 to achieve pneumatic dust removal. The top outlet of the dust collector 19 is connected to the induced draft fan, and the bottom outlet 20 is connected to the material collection cylinder.

[0052] like Figure 7 As shown, the precursor powder material and lithium battery powder material fall from two hoppers 17 respectively, and are fed into the first feed pipe 1 and the second feed pipe 2 respectively by the airflow of the blower 16. Figure 1 As shown, the two materials come into contact with the first blade 9 installed inside the first feed pipe 1 and the second feed pipe 2 under the action of airflow. Figure 6 As shown, because the first blade 9 has a torsional structure, the raw materials are sheared and dispersed in both the axial and radial directions. Since the first blades 9 of the first feed pipe 1 and the second feed pipe 2 have the same torsional direction, only the flow direction of the raw materials is different, the two raw materials are dispersed in a spiral form. The spiral formation allows the two raw materials to penetrate each other, enhancing the mixing effect. Then, the two raw materials enter the inlet of the first nozzle 10 in a gas-solid spiral dispersion form. Since the first nozzle 10 is a gradually narrowing pipe structure, the gas-solid two-phase flow passing through the first nozzle 10 will undergo a strong acceleration effect, thus entering the first-stage mixing chamber 3. Since the first-stage mixing chamber 3 has a spherical structure, the material after spiral dispersion and acceleration can generate a strong turbulent mixing effect.

[0053] like Figure 4As shown, the motor 144 of the stirring device 14 starts up, driving the stirring blade rod 141 to start rotating at a high speed, further stirring the gas-solid two-phase flow field of the first mixing chamber 3 and the second mixing chamber 5, so as to achieve rapid and uniform mixing.

[0054] like Figure 3 As shown, the material mixed in the first-stage mixing chamber 3 is diverted into two first diversion pipes 4 under the action of airflow and gravity. Since a second blade 11 is also installed inside the diversion pipe, the material entering the first diversion pipe 4 undergoes shearing and converging under the action of the blade, further enhancing the mixing effect. The two mixed raw materials then enter the second nozzle 12 under the action of airflow and gravity, are accelerated again, and enter the second-stage mixing chamber 5, where a second strong turbulent mixing is generated.

[0055] like Figure 2 As shown, the material mixed in the second-stage mixing chamber 5 is diverted into two second diversion pipes 6 under the action of airflow and gravity, and then enters the third nozzle 13. It is accelerated a third time and enters the third-stage mixing chamber 7. The mixed material ejected through the third nozzle 13 can form a certain diffusion effect, causing the two gas-solid jets to interlock and improving the uniformity of mixing. No stirring device is added to the third-stage mixing chamber to prevent segregation after mixing. Then, under the action of airflow and gravity, it flows into the discharge pipe 8.

[0056] At this time, under the negative pressure of the induced draft fan 18, the mixed raw materials are sucked from the discharge pipe 8 to the dust collector 19, and after passing through the dust collector, they fall into the collection cylinder 20, realizing the function of raw material collection. The air passing through the dust collector 18 is filtered by the dust collector 18 and then discharged into the atmosphere through the induced draft fan 19, completing the continuous mixing operation.

[0057] Example 2:

[0058] Unlike Embodiment 1, the first diversion pipe 4 and its internal second blade 11, as well as the second-stage mixing chamber 5, are removed. The inlet of the second diversion pipe 6 is connected to the outlet of the first-stage mixing chamber 3, and the lower half of the stirring device 14 is connected to the interior of the third-stage mixing chamber 7 via a flange connection. The remaining components remain unchanged to achieve a multi-stage combined continuous mixing function. Details are as follows.

[0059] like Figure 1 As shown, precursor powder and lithium battery powder are fed into the first feed pipe 1 and the second feed pipe 2 respectively under the action of airflow. The two materials come into contact with the first blades 9 installed inside the first feed pipe 1 and the second feed pipe 2 under the action of airflow. Figure 6As shown, because the first blade 9 has a torsional structure, the raw materials are sheared and dispersed in both the axial and radial directions. Since the first blades 9 of the first feed pipe 1 and the second feed pipe 2 have the same torsional direction, only the flow direction of the raw materials is different, the two raw materials are dispersed in a spiral form. The spiral formation allows the two raw materials to penetrate each other, enhancing the mixing effect. Then, the two raw materials enter the inlet of the first nozzle 10 in a gas-solid spiral dispersion form. Since the first nozzle 10 is a gradually narrowing pipe structure, the gas-solid two-phase flow passing through the first nozzle 10 will undergo a strong acceleration effect, thus entering the first-stage mixing chamber 3. Since the first-stage mixing chamber 3 has a spherical structure, the material after spiral dispersion and acceleration can generate a strong turbulent mixing effect.

[0060] like Figure 4 As shown, the motor 144 of the stirring device 14 starts up, driving the stirring blade rod 141 to start rotating at a high speed, further stirring the gas-solid two-phase flow field of the first mixing chamber 3 and the third mixing chamber 7, so as to achieve rapid and uniform mixing.

[0061] like Figure 2 As shown, the material mixed in the first mixing chamber 5 is diverted into two second diversion pipes 6 under the action of airflow and gravity, and then enters the third nozzle 13. It is accelerated a second time and enters the third mixing chamber 7. The mixed material ejected through the third nozzle 13 can form a certain diffusion effect, so that the two gas-solid jets are interpenetrated, improving the uniformity of mixing. Then, under the action of airflow and gravity, it flows into the discharge pipe 8.

[0062] At this time, under the negative pressure of the induced draft fan 18, the mixed raw materials are sucked from the discharge pipe 8 to the dust collector 19, and after passing through the dust collector, they fall into the collection cylinder 20, realizing the function of raw material collection. The air passing through the dust collector 18 is filtered by the dust collector 18 and then discharged into the atmosphere through the induced draft fan 19, completing the continuous mixing operation.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Unless otherwise specified, an element defined by the phrase "comprising..." or "including..." does not exclude the presence of additional elements in the process, method, article, or terminal device that includes said element. Additionally, in this document, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number.

[0064] The above description of the embodiments is provided to facilitate understanding and use of the present invention by those skilled in the art. It is obvious to those skilled in the art that various modifications can be easily made to the embodiments, and the general principles described herein can be applied to other embodiments without creative effort. Therefore, the present invention is not limited to the above embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A continuous pipeline powder mixing device for preparing positive electrode materials, characterized in that, The system includes a fan, a silo, a dust collector, an induced draft fan, a receiving cylinder, a mixing device, and a stirring device. The mixing device includes a connecting pipe and at least two mixing chambers. The connecting pipe connects to the mixing chambers. The stirring device includes stirring blades, a gear transmission rod, and a motor. Two stirring blades are provided, each connected to one end of the gear transmission rod. Each stirring blade is inserted into one of the mixing chambers. The gear transmission rod and the motor shaft are each equipped with a bevel gear, which are engaged at a 90° angle. The inlet of the connecting pipe connects to the fan and the silo, and the outlet connects to the dust collector. The top outlet of the dust collector connects to the induced draft fan, and the bottom connects to the receiving cylinder. The connecting pipe includes a first feed pipe, a second feed pipe, a first diversion pipe, a second diversion pipe, and a discharge pipe. The mixing chamber includes a first-stage mixing chamber, a second-stage mixing chamber, a third-stage mixing chamber, a first nozzle, a second nozzle, and a third nozzle. Two of each of the first and second branch pipes are provided. The outlets of the first and second feed pipes are respectively connected to the two first nozzles. The two first nozzles are respectively connected to the first-stage mixing chamber. The inlets of the two first branch pipes are connected to the first-stage mixing chamber, and their outlets are respectively connected to the two second nozzles. The two second nozzles are respectively connected to the second-stage mixing chamber. The inlets of the two second branch pipes are connected to the second-stage mixing chamber, and their outlets are connected to the two third nozzles. The two third nozzles are connected to the third-stage mixing chamber. The outlet of the third stage mixing chamber is connected to the inlet of the discharge pipe. Two stirring blade rods are respectively inserted into the first-stage mixing chamber and the second-stage mixing chamber.

2. The continuous pipeline powder mixing device for preparing positive electrode materials according to claim 1, characterized in that, The stirring device also includes an airflow sealing end cap, an airflow sealing chamber, and a bearing corresponding to the stirring blade rod. The airflow sealing chamber is located on the stirring blade rod, and a small hole is opened at the bottom of the airflow sealing chamber. The airflow sealing end cap is located at the top of the airflow sealing chamber, and the bearing is installed in the airflow sealing chamber for cooperating with the stirring blade rod.

3. The continuous pipeline powder mixing device for preparing positive electrode materials according to claim 2, characterized in that, The stirring device also includes a large sealing ring and a small sealing ring, which are respectively located on the outer ring and inner ring of the bearing.

4. The continuous pipeline powder mixing device for preparing positive electrode materials according to claim 1, characterized in that, The stirring blade rod has 2-10 layers of blades, with 2-5 blades in each layer.

5. The continuous pipeline powder mixing device for preparing positive electrode materials according to claim 1, characterized in that, The first feed pipe and the second feed pipe are respectively provided with a first blade, and the first diversion pipe is provided with a second blade. The first blade and the second blade are spirally arranged. The first blades in the first feed pipe and the second feed pipe have the same spiral direction, and the second blades in the two first diversion pipes have the same spiral direction.

6. The continuous pipeline powder mixing device for preparing positive electrode materials according to claim 5, characterized in that, The spiral diameter of the first blade and the second blade ranges from 20 to 200 mm, the pitch ranges from 20 to 100 mm, and the number of twists is 0.5 turns.

7. The continuous pipeline powder mixing device for preparing positive electrode materials according to claim 1, characterized in that, The first and second feed pipes are circular pipes with a diameter ranging from 20 to 200 mm. The first and second feed pipes include a straight pipe, a bend, a straight pipe, a bend, and a straight pipe connected in sequence. The length of the straight pipe ranges from 40 to 500 mm, and the bending angle of the bend ranges from 30° to 160°.

8. The continuous pipeline powder mixing device for preparing positive electrode materials according to claim 1, characterized in that, The first nozzle, the second nozzle, and the third nozzle are configured as gradually converging pipes with a converging angle ranging from 10° to 60°, an inlet diameter ranging from 20 to 200 mm, and an outlet diameter ranging from 5 to 30 mm.

9. The continuous pipeline powder mixing device for preparing positive electrode materials according to claim 1, characterized in that, The first and second stage mixing chambers are hollow spherical structures with a diameter range of 40-300mm. The third stage mixing chamber is a cylindrical structure with cone angles at the top and bottom, with cone angles ranging from 10° to 45° and a diameter range of 40-300mm.

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