Double-excitation double-rigid ball mill, sodium ion battery positive electrode material production equipment and process

Abstract

The invention relates to the field of grinding technology, and in particular to a double-excitation double-rigid body ball mill, sodium ion battery positive electrode material production equipment and process, comprising an outer rigid body, an inner rigid body, an elastic vibration platform and two vibration motors, wherein the outer rigid body comprises a horizontal grinding cylinder, a feeding port is provided at the top of the grinding cylinder, a discharge port is provided at one end of the grinding cylinder along its axial direction, the inner rigid body comprises a stirring blade rotatably arranged inside the grinding cylinder, and the rotation axis of the stirring blade is parallel to and deviates from the central axis of the grinding cylinder, the elastic vibration platform is used to support the grinding cylinder, and two vibration motors are distributed on both sides of the grinding cylinder to drive the grinding cylinder to vibrate; the invention utilizes the grinding cylinder and the stirring blade located inside the grinding cylinder to form a double rigid body, forms a new grinding high-energy zone near the stirring blade, greatly increases the number of effective collisions between materials and grinding media, and thus improves the grinding efficiency.

Description

Technical Field

[0001] The present invention relates to the field of grinding technology, and in particular to a double-excitation double-rigid ball mill, sodium ion battery positive electrode material production equipment and process. Background Art

[0002] With the continuous development of human production technology, the number and types of materials to be crushed are increasing, which objectively requires the vibration mill to develop in the direction of large-scale. However, it is found in practice that the large-scale equipment does not bring the expected high efficiency. Therefore, the energy transfer state inside the vibration mill began to be questioned. The energy distribution problem inside the vibration mill has always been one of the core issues in the study of vibration mills. The energy of ordinary ball mills is mainly concentrated in a narrow area at the lower edge of the grinding chamber. The energy decreases rapidly in an exponential decay process from the edge to the center, thus forming a large central low-energy zone in the middle and upper part of the grinding chamber. Due to the existence of the low-energy zone, the materials in it are difficult to be ground due to insufficient energy, resulting in an increase in ineffective collisions of the grinding medium, an increase in useless work, a decrease in the energy utilization rate of the system, a widening of the product particle size distribution, and the failure to meet the requirements of high output and narrow particle size distribution. The range of the central low-energy zone increases with the increase in the diameter of the grinding barrel. Therefore, the existence of the low-energy zone becomes a "bottleneck" for the low energy utilization rate and large-scale development of the vibration mill. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in order to overcome the problem in the prior art that a large central low-energy zone is formed in the middle and upper part of the grinding chamber, making the material therein difficult to be ground due to insufficient energy, resulting in an increase in invalid collisions of the grinding medium, an increase in useless work, a decrease in the energy utilization rate of the system, a wider product particle size distribution, and the failure to meet the requirements of high output and narrow particle size distribution, a double-excitation double-rigid body ball mill is now provided.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solution: a double-excitation double-rigid ball mill, comprising:

[0005] The outer rigid body comprises a horizontal grinding cylinder, the top of which is provided with a feed port, and one end of the grinding cylinder along its axial direction is provided with a discharge port, the material and the grinding medium are fed in from the feed port, and discharged from the discharge port after vibration grinding;

[0006] The inner rigid body comprises a stirring blade rotatably arranged inside the grinding cylinder, and the rotation axis of the stirring blade is parallel to and deviates from the central axis of the grinding cylinder;

[0007] An elastic vibration platform, used for supporting the grinding cylinder;

[0008] And two vibration motors, which are distributed on both sides of the grinding drum to drive the grinding drum to vibrate;

[0009] The above technical solution utilizes the grinding cylinder and the stirring blades located inside it to form a double rigid body, forming a new grinding high-energy zone near the stirring blades, greatly increasing the number of effective collisions between the material and the grinding medium, thereby improving the grinding efficiency.

[0010] Furthermore, the rotation axis of the stirring blade is located below the central axis of the grinding drum and on the downstream side of the material movement trajectory.

[0011] Furthermore, the stirring blade includes a rotating shaft rotatably connected to the grinding drum and a plurality of blades arranged along the circumference of the rotating shaft, and each blade extends axially along the rotating shaft.

[0012] Furthermore, the discharge port is provided with a discharge valve, which includes a valve body having a valve cavity, a discharge port being provided at the bottom of the valve cavity, a grille being provided on the side of the valve cavity close to the grinding cylinder, a push plate being slidably provided inside the valve cavity for opening or blocking the grille, and a linear reciprocating motion mechanism for pushing the push plate being fixed on the valve body.

[0013] Furthermore, the grille includes a plurality of longitudinal baffles arranged at intervals, each baffle being cylindrical, and a channel for materials to pass through is formed between two adjacent baffles.

[0014] Furthermore, the inner wall of the grinding cylinder and the outer wall of the stirring blade are both provided with bushings, and the bushings are made of polyurethane.

[0015] Furthermore, the outer peripheral wall of the grinding cylinder is provided with a cooling coil.

[0016] Furthermore, the elastic vibration platform includes an upper base plate, a lower base plate and a plurality of elastic members located therebetween.

[0017] The present invention also provides a sodium ion battery positive electrode material production device, comprising the above-mentioned double-excitation double-rigid ball mill;

[0018] The present invention also provides a sodium ion battery positive electrode material production process, which is used for the above-mentioned sodium ion battery positive electrode material production equipment.

[0019] The beneficial effects of the present invention are:

[0020] 1. It uses a double rigid body vibration mill design, and adds stirring blades inside the mill barrel to form a new high-energy grinding zone, which has high production efficiency;

[0021] 2. It adopts dual-excitation dual-rigid body connection. Compared with the serial grinding equipment whose vibration source is through a flexible soft shaft plus a bearing seat, it has a low maintenance rate, a long service life and high production efficiency;

[0022] 3. The cooling water pipes that are spread all over the cylinder can take away the heat generated by vibration and improve the stability and service life of the equipment.

[0023] 4. The modal frequency of the mill body is relatively low, while the modal frequency of the inner rigid body is relatively high. When the operating frequency is close to a modal frequency of the inner rigid body, anti-resonance will occur in the system, the inner rigid body will vibrate violently, while the body will still maintain the stable state of a conventional vibration mill. The impact on the springs and bearings of the body will decrease, and its life and reliability will be improved. The working noise will be reduced, which is beneficial to environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 It is a three-dimensional schematic diagram of the present invention;

[0026] Figure 2 A top view of the present invention;

[0027] Figure 3 is a side view of the present invention;

[0028] Figure 4 for Figure 3 Sectional view in the AA direction;

[0029] Figure 5 It is a three-dimensional schematic diagram of the stirring blade;

[0030] Figure 6 It is a three-dimensional schematic diagram of the discharge valve;

[0031] Figure 7 is a cross-sectional view of the discharge valve;

[0032] Figure 8 is a three-dimensional schematic diagram of the grid;

[0033] Fig. 9 This is the sampling particle size distribution table of ordinary ball mill;

[0034] Fig.10 This is the sampling particle size distribution table of the double-excitation double-rigid ball mill;

[0035] Fig.11 are the sampling quality curves of the two ball mills;

[0036] Fig.12 It is the cumulative particle size analysis curve of ordinary ball mill;

[0037] Fig.13 It is the cumulative particle size analysis curve of the double-excitation double-rigid ball mill;

[0038] In the figure:

[0039] 1. Grinding cylinder; 101. Feed inlet; 102. Discharge outlet; 103. Reinforcement ring; 1031. Notch;

[0040] 2. stirring blade; 201. rotating shaft; 202. blade;

[0041] 3. Elastic vibration platform; 301. Upper base plate; 302. Lower base plate; 303. Elastic member;

[0042] 4. Vibration motor;

[0043] 5. Cooling coil;

[0044] 6. Bushing;

[0045] 7. Discharge valve; 701. Valve body; 7011. Valve chamber; 702. Discharge port; 703. Grille; 7031. Stop rod; 704. Push plate; 705. Linear reciprocating motion mechanism. DETAILED DESCRIPTION

[0046] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner only, and therefore only show the components related to the present invention, and directions and references such as up, down, left, right, etc. may only be used to help describe the features in the drawings. Therefore, the following specific embodiments are not to be taken in a limiting sense, and the scope of the subject matter claimed is limited only by the attached claims and their equivalents.

[0047] like Figure 1-Figure 4 As shown, a double-excitation double-rigid ball mill can be used not only for grinding a single material, but also for grinding, mixing, doping, and even embedding a variety of raw materials in the sodium electrolysis process. The ball mill includes an outer rigid body, an inner rigid body, an elastic vibration platform 3, and two vibration motors 4. The outer rigid body and the inner rigid body form a double-rigid structure, and the two vibration motors 4 form a double-excitation structure.

[0048] The outer rigid body comprises a horizontal grinding cylinder 1, and end covers are provided at both ends of the grinding cylinder 1 along its axial direction, so as to form a closed grinding chamber inside the grinding cylinder 1, and a feed port 101 is provided at the middle part of the top of the grinding cylinder 1, and a discharge port 102 is provided at one end of the grinding cylinder 1 along its axial direction. The material and the grinding medium are put into the grinding chamber from the feed port 101, and the grinding cylinder 1 drives the internal grinding medium and the material to collide with the inner wall through vibration to perform vibration grinding on the material, and the material is discharged from the discharge port 102 after the grinding is completed;

[0049] The inner rigid body includes a stirring blade 2 rotatably arranged inside the grinding cylinder 1. Both ends of the stirring blade 2 are mounted on two end covers and are rotatably connected to the end covers through bearings. The rotation axis of the stirring blade 2 is parallel to the central axis of the grinding cylinder 1 and the rotation axis of the stirring blade 2 is slightly deviated from the central axis of the grinding cylinder 1. It can be understood that the stirring blade 2 is still approximately located in the center of the grinding cylinder 1 but can play an eccentric effect. The material and the grinding medium not only collide with the inner wall of the grinding cylinder 1, but also collide with the stirring blade 2, which increases the number of collisions between the two and forms a new high-energy grinding area near the stirring blade 2. The stirring blade 2 fundamentally changes the one-way transmission of vibration energy from the inner wall of the grinding cylinder 1 to the inside, which greatly shortens the transmission path of vibration energy, helps to homogenize the internal energy distribution, effectively overcomes the central low-energy area, and greatly improves the utilization rate of vibration energy.

[0050] The elastic vibration platform 3 is used to support the external rigid body;

[0051] Two vibration motors 4 are distributed on both sides of the grinding cylinder 1 to drive the grinding cylinder 1 to vibrate. The vibration motor 4 provides an exciting force through an eccentric block. The two vibration motors 4 vibrate synchronously to form a double-excitation structure.

[0052] First, open the feed butterfly valve, and inject the sodium ferric sulfate positive electrode material and the grinding medium into the grinding cylinder 1 from the top feed port 101 according to the specific process mixing ratio requirements. When the grinding medium and material injection amount reaches the weight specified by the process, close the feed butterfly valve;

[0053] Then, the vibration motor 4 is started, and the vibration motors 4 on both sides drive the eccentric blocks to rotate to form an exciting force rigidity to drive the grinding cylinder 1 to start accelerated vibration. The key process parameters such as the feed ratio of grinding medium to material and the grinding time can be pre-set in the control system of the equipment;

[0054] Under the combined effect of centrifugal force, friction and gravity, the grinding medium and the material are brought to a certain height, move in some elliptical trajectories and collide with each other. The hard grinding medium crushes and mixes the positive electrode material of sodium ferric sulfate in the grinding cylinder 1. At the same time, the stirring blade 2 inside the grinding cylinder 1 starts to rotate under the vibration of the grinding cylinder 1 and the collision of the grinding medium and the material, forming a new high-energy grinding area in the original low-energy grinding area in the center, increasing the grinding efficiency, and achieving the particle size and uniformity required by the process after a period of time;

[0055] Finally, the material meeting the particle size requirements is discharged from the discharge port 102 .

[0056] In some examples, the rotation axis 201 of the inner rigid body is located below the central axis of the grinding drum 1 and on the downstream side of the material movement trajectory, such as Figure 2 As shown, after the material enters the grinding drum 1 from the feed inlet 101, it moves counterclockwise under the vibration of the grinding drum 1, and the rotation axis of the stirring blade 2 is located on the downstream side (ie, the fourth quadrant).

[0057] In some examples, such as Figure 5 As shown, the stirring blade 2 includes a rotating shaft 201 rotatably connected to the grinding cylinder 1 and a plurality of blades 202 arranged circumferentially along the rotating shaft 201. The number of the blades 202 may be, but is not limited to, three, four or five, etc., and each blade 202 extends axially along the rotating shaft 201, and the extension length is slightly smaller than the axial extension length of the grinding cylinder 1, so as to avoid interference between the rotating blades 202 and the end of the grinding cylinder 1.

[0058] In some examples, such as Figure 6-Figure 8 As shown, the bottom of the discharge port 102 is an arc-shaped that matches the grinding chamber. The discharge port 102 is provided with a discharge valve 7, which includes a valve body 701 with a valve chamber 7011. The bottom of the valve chamber 7011 is provided with a discharge port 702. The valve chamber 7011 is provided with a grille 703 on one side close to the grinding cylinder 1. A push plate 704 is slidably provided inside the valve chamber 7011 for opening or blocking the grille 703. A linear reciprocating motion mechanism 705 for pushing the push plate 704 is fixed on the valve body 701. The motion mechanism 705 can be but not limited to a cylinder, a screw nut structure, etc. In this example, there are two cylinders arranged side by side; when the grinding cylinder 1 is in the grinding state, the cylinder pushes the push plate 704 to block the grid 703, and the grinding medium and the material are only ground in the grinding chamber and cannot enter the discharge valve 7; when the grinding cylinder 1 is in the discharging state, the cylinder pulls the push plate 704 away from the grid 703, and the material that meets the particle size requirements enters the valve chamber 7011 from the grinding chamber through the grid 703 and is discharged from the discharge port 702.

[0059] In some examples, the grille 703 includes a plurality of longitudinal baffles 7031 disposed at intervals. The baffles 7031 are cylindrical, and a channel for materials to pass through is formed between two adjacent baffles 7031 .

[0060] In some examples, the inner wall of the grinding cylinder 1 and the outer wall of the stirring blade 2 are both provided with a bushing 6, and the bushing 6 is made of polyurethane. The polyurethane has a certain elasticity and can provide a certain buffer for the grinding medium and the material in the grinding chamber to prevent the grinding medium and the material from directly contacting the rigid cylinder wall or the rigid blade 202 and causing adhesion to the wall; preferably, the polyurethane is a modified material, which improves its thermal conductivity and wear resistance by adding carbon fiber to the polyurethane matrix, thereby extracting the heat inside the grinding cylinder 1 and extending its service life.

[0061] In some examples, a cooling coil 5 is provided on the outer wall of the grinding cylinder 1, one end of the coil is a water inlet, and the other end is a water outlet. Cooling circulating water is formed in the coil to cool the grinding cylinder 1. The coil can increase the contact area with the grinding cylinder 1 to provide a heat dissipation effect. Since polyurethane has poor thermal conductivity, the cooling coil 5 arranged in contact with the wall of the grinding cylinder 1 can take away the heat generated by the vibration in the grinding cylinder 1, thereby increasing the service life of the grinding cylinder 1.

[0062] In some examples, the elastic vibration platform 3 includes an upper base plate 301, a lower base plate 302 and a plurality of elastic members 303 located therebetween; the grinding drum 1 is welded and fixed to the upper base plate 301 via brackets located at both ends thereof; the vibration motor 4 is welded and fixed to the upper base plate 301 via a vibration motor 4 mounting base; the vibration motor 4 can be arranged horizontally or gradually tilted upward from the discharge port 102 toward the vibration motor 4, with an inclination angle of 1°-3°, so that when the grinding drum 1 is in a discharging state, the internal material can more easily reach the discharge port 102 for discharge; the lower base plate 302 is used for positioning and firm support, and the upper base plate 301, the lower base plate 302, the bracket and the vibration motor 4 mounting base are all welded with a plurality of reinforcing ribs To enhance the overall strength; the elastic member 303 is a composite spring, there are eight composite springs, divided into two rows, the two rows of composite springs correspond to the two vibration motors 4 one by one, and the axis of each row of composite springs is located between the gravity axis of the grinding cylinder 1 and the vibration motor 4, and the rigid body supported by the composite springs vibrates, so that the grinding medium and the grinding cylinder 1, the grinding medium and the grinding medium, and the grinding medium and the stirring blade 2 produce mutual impact, and the material is crushed into smaller particles; the peripheral wall of the grinding cylinder 1 is provided with a plurality of reinforcing rings 103 arranged at intervals along its axial direction to prevent the exciting force from being too large and causing cracking, and a notch 1031 is provided on the reinforcing ring 103 for the cooling coil 5 to pass through, and a notch 1031 is also provided on the bracket for the cooling coil 5 to pass through.

[0063] In some examples, a sodium ion battery positive electrode material production device includes a vibration dryer, a vibration cooler, a ball mill and a press connected in sequence, and the ball mill is the above-mentioned double-excitation double-rigid ball mill;

[0064] In some examples, a sodium ion battery positive electrode material production process is used for the above-mentioned sodium ion battery positive electrode material production equipment, and the raw material of the sodium battery positive electrode material (i.e., the iron source) is first sent to a vibration dryer for drying. After drying, it is sent to a vibration cooler to be cooled to room temperature, and then the iron source is mixed with the sodium source and the carbon source in a certain proportion and then sent to a double-excitation double-rigid ball mill for grinding. After grinding, it is pressed by a press and then sent to a kiln for sintering, and the outer rail conveyor takes out the sagger and flips the material out to enter the next process.

[0065] Working principle:

[0066] 1. Feeding: Open the feeding butterfly valve, and inject the sodium ferric sulfate cathode material and grinding medium into the grinding cylinder 1 from the top feeding port 101 according to the specific process mixing ratio requirements. When the grinding medium and material injection amount reaches the weight specified by the process, close the feeding butterfly valve;

[0067] 2. Refrigeration cycle: Open the cooling water valve to form cooling circulating water in the cooling coil 5 to cool the grinding drum 1;

[0068] 3. Start the equipment: Start the vibration motor 4. The vibration motors 4 on both sides drive the eccentric blocks to rotate to form an exciting force to rigidly drive the grinding barrel 1 to start accelerated vibration. Key process parameters such as the feed ratio of grinding medium to material and grinding time can be pre-set in the control system of the equipment.

[0069] 4. Grinding process: Under the combined effect of centrifugal force, friction and gravity, the grinding medium and the material are brought to a certain height, move in some elliptical trajectories and collide with each other. The hard grinding medium crushes and mixes the positive electrode material of sodium ferric sulfate in the grinding cylinder 1. At the same time, the stirring blade 2 inside the grinding cylinder 1 starts to rotate under the vibration of the grinding cylinder 1 and the collision of the grinding medium and the material, forming a new high-energy grinding area in the original central low-energy grinding area, increasing the grinding efficiency, and achieving the particle size and uniformity required by the process after a period of time;

[0070] 5. Discharging: After completing the working time set by the process parameters, turn the discharging knob, and the vibration motors 4 on both sides will slow down and change to the discharging mode. The double cylinders of the discharging mechanism will drive the push plate 704 to retract, and the material will flow out from the grille 703 as the ball mill vibrates, and the grinding medium will continue to remain in the grinding cylinder 1. When the discharging is completed, turn the discharging knob back, and the double cylinders will drive the push plate 704 to extend to form a seal.

[0071] Comparative experiment:

[0072] The equipment was compared with an ordinary ball mill. The test process was as follows: feed was added through the feed port 101 at the middle of the top of the grinding cylinder 1, and the particles with smaller particle sizes entered the discharge pipe through the discharge port 102. Since the particle sizes of the materials entering the discharge pipe ranged from tens of microns to several millimeters, the materials with larger particle sizes were excluded for the convenience of actual analysis. Each time the sample was passed through a 20-mesh sieving sieve, the remaining part was put back into the grinding cylinder 1 for further crushing, and the part that passed through 20 mesh was subjected to the next step of particle size analysis. Sampling was performed every 10 minutes, and the above operation was repeated after each sampling and the samples were numbered. Sampling was performed 5 times in a row.

[0073] In order to conduct comparative tests between the double-excitation double-rigid ball mill and the ordinary ball mill, after sampling of one model is completed, all the grinding media and remaining materials in the grinding cylinder 1 are removed and separated, and then the required grinding media and materials are added again, and sampling is carried out according to the previous process, and sampling is still carried out 5 times.

[0074] The collected samples were sieved through 80 mesh, 150 mesh, and 2000 mesh sieves in turn, and the mass of each sieve residue was recorded and then calculated and sorted. Fig. 9 Table 10 is the sampling particle size distribution table of the ordinary ball mill, and Table 11 is the sampling particle size distribution table of the double-excitation double-rigid ball mill.

[0075] First, the sampling quality of the two ball mills is plotted as a function of sampling time, such as Fig.11 As shown in the figure, it can be seen that as time goes by, the quality of samples collected by the two mills increases, but the sampling quality of the ordinary ball mill increases slowly, while the sampling volume of the double-excitation double-rigid body increases rapidly. From the situation that the time after reaching stability is 40 to 50 minutes, the sampling volume of the double-excitation double-rigid body ball mill is about 3 times that of the ordinary ball mill, which is reflected in the productivity. It shows that the productivity of the double-excitation double-rigid body is about 2 times higher than that of the original vibration mill.

[0076] The reason for this situation can be explained as follows: Compared with ordinary ball mills, although the effective volume of the double-excitation dual rigid body is reduced due to the addition of stirring blades 2, in order to ensure a constant filling rate in the two tests, the mass of the added grinding medium is also reduced accordingly, but the reduced volume is exactly the part of the center of the grinding barrel 1 of the ordinary ball mill with the lowest energy utilization rate, that is, the central low-energy area. After an inner rigid body is added to the center of the grinding barrel 1 to occupy the central part of the grinding barrel 1, the materials that were originally in the inner rigid body part and are now squeezed to the surrounding area by the inner rigid body first receive more energy from the inner wall of the barrel because they leave the central part of the grinding barrel 1 and are relatively close to the inner edge of the grinding barrel 1. More importantly, they receive a large amount of energy from the inner rigid body and spread it to the surrounding materials, and the number of effective collisions between the materials and the grinding medium is also doubled. Therefore, these materials are ground as quickly as those close to the inner wall of the grinding barrel 1.

[0077] Then draw the cumulative particle size analysis curves of the two ball mills, such as Fig.12 and Fig.13 As shown in the figure, it can be seen that: with the extension of working time, the cumulative particle size distribution of the screen residue of the two ball mills shows a downward trend, indicating that extending the working time within a certain period of time can improve the grinding effect and obtain a better particle size. This shows that with the continuous input of energy, the number of collisions between the material and the grinding medium continues to increase, and the material particles will become finer and finer.

[0078] The above-mentioned ideal embodiments of the present invention are for inspiration. Through the above-mentioned description, relevant staff can make various changes and modifications without departing from the technical idea of ​​the present invention. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A double-excitation double-rigid ball mill, characterized in that: include: The outer rigid body comprises a horizontal grinding cylinder (1), wherein the grinding cylinder (1) is provided with a feed inlet (101) at the top and a discharge outlet (102) along one end thereof in the axial direction; The inner rigid body comprises a stirring blade (2) rotatably arranged inside the grinding cylinder (1), wherein the rotation axis of the stirring blade (2) is parallel to and deviates from the central axis of the grinding cylinder (1); An elastic vibration platform (3) used for supporting the grinding cylinder (1); and two vibration motors (4), which are distributed on both sides of the grinding cylinder (1) and are used to drive the grinding cylinder (1) to vibrate; The discharge port (102) is provided with a discharge valve (7), which comprises a valve body (701) having a valve cavity (7011), a discharge port (702) being provided at the bottom of the valve cavity (7011), a grille (703) being provided on a side of the valve cavity (7011) close to the grinding cylinder (1), a push plate (704) being slidably provided inside the valve cavity (7011) for opening or blocking the grille (703), and a linear reciprocating motion mechanism (705) for pushing the push plate (704) being fixed on the valve body (701); The rotation axis of the stirring blade (2) is located below the central axis of the grinding drum (1) and on the downstream side of the material movement trajectory.

2. The double-excitation double-rigid ball mill according to claim 1 is characterized in that: The stirring blade (2) comprises a rotating shaft (201) rotatably connected to the grinding drum (1) and a plurality of blades (202) arranged circumferentially along the rotating shaft (201), and each blade (202) extends axially along the rotating shaft (201).

3. The double-excitation double-rigid ball mill according to claim 1 is characterized in that: The grille (703) comprises a plurality of longitudinal baffles (7031) arranged at intervals, wherein the baffles (7031) are cylindrical, and a channel for materials to pass through is formed between two adjacent baffles (7031).

4. The double-excitation double-rigid ball mill according to claim 1 is characterized in that: The inner circumferential wall of the grinding cylinder (1) and the outer circumferential wall of the stirring blade (2) are both provided with bushings (6), and the bushings (6) are made of polyurethane.

5. The double-excitation double-rigid ball mill according to claim 1 is characterized in that: The outer peripheral wall of the grinding cylinder (1) is provided with a cooling coil (5).

6. The double-excitation double-rigid ball mill according to claim 1 is characterized in that: The elastic vibration platform (3) comprises an upper base plate (301), a lower base plate (302), and a plurality of elastic members (303) located therebetween.

7. A sodium ion battery positive electrode material production equipment, characterized in that: It comprises the double-excitation double-rigid body ball mill as described in any one of claims 1-6.

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