A stirring and mixing device for the preparation of NFPP precursor powder

Abstract

This invention provides a mixing device for preparing NFPP precursor powder, belonging to the technical field of powder metallurgy preparation equipment. It includes a mixing tank component, a drive assembly, a first stirring action transmission assembly, and a second stirring action transmission assembly. The drive assembly drives the coordinated operation of the first and second stirring action transmission assemblies, enabling the main spur gear to drive the secondary spur gear to rotate the first stirring shaft, and simultaneously, the main bevel gear to drive the secondary bevel gear to rotate the cam. This causes the eccentric end of the cam to push the bottom sleeve to reciprocate up and down via a transmission link, thereby driving the hexagonal sliding column to reciprocate up and down while rotating. Furthermore, the initial height of each hexagonal sliding column in this device is different, forming an undulating stirring action, which effectively improves the uniformity of material mixing and solves the problem of traditional devices always stirring at the same layer, lacking three-dimensional mixing action, and easily generating mixing dead zones.

Description

Technical Field

[0001] This utility model relates to the field of powder metallurgy preparation equipment technology, and in particular to a stirring and mixing device for the preparation of NFPP precursor powder. Background Technology

[0002] NFPP precursor powder is an intermediate or semi-finished product used in the manufacture of sodium iron pyrophosphate (Na4Fe3(PO4)2P2O7, abbreviated as NFPP), a cathode material for sodium-ion batteries. In actual production, it is usually produced by uniformly mixing raw materials such as sodium, iron, and phosphorus sources in the liquid phase through processes such as co-precipitation and sand milling, followed by spray drying to form microspheres or powders with specific morphologies.

[0003] The quality of the precursor directly determines the microstructure of the final sintered NFPP cathode material. High-quality precursor powder has a uniform particle size distribution, good flowability, and specific morphology, which enables the final cathode material to have higher compaction density, more stable cycle life, and better electrochemical performance.

[0004] However, existing mixing devices still have many shortcomings when processing slurries or powders used to prepare NFPP precursors. Traditional mixing equipment often uses a single rotary shearing method with simple impeller designs and a constant horizontal position, which leads to insufficient mixing of materials, the formation of mixing dead zones, and uneven distribution of raw material components. This inhomogeneity directly affects the quality of the precursor powder, causing problems such as wide particle size distribution and poor morphological consistency, which in turn affects the performance of the final cathode material. Utility Model Content

[0005] The purpose of this invention is to provide a stirring and mixing device for the preparation of NFPP precursor powder, which aims to solve the problems of uneven mixing and the easy generation of dead zones in the prior art, and to ensure the uniformity and excellent morphology of the precursor components.

[0006] The purpose of this utility model is achieved through the following technical solution: a stirring and mixing device for the preparation of NFPP precursor powder, comprising a stirring tank component, a drive component, a first stirring action transmission component, and a second stirring action transmission component.

[0007] The mixing tank component includes a mixing tank body, the drive assembly includes a main bevel gear, the first mixing action transmission assembly includes a spur gear, and the second mixing action transmission assembly includes a hexagonal sliding column.

[0008] A rotatable main spur gear is installed in the middle of the outer bottom end of the mixing tank. A main bevel gear is connected to the bottom end of the main spur gear. A first stirring shaft is evenly screwed into the bottom body of the mixing tank. The auxiliary spur gears are fixed to the outer shaft surface of the first stirring shaft, and each auxiliary spur gear meshes with the main spur gear.

[0009] The hexagonal sliding column is slidably inserted into the first stirring shaft. The outer bottom end of the stirring tank is evenly screwed with the split bevel gears, and the main bevel gear meshes with each set of split bevel gears. The outer side of each set of split bevel gears is connected to a cam. The outer bottom end of the stirring tank and the position opposite to each set of hexagonal sliding columns are slidably connected to the bottom sleeve. The bottom end of the hexagonal sliding column is screwed to the bottom sleeve. A transmission link is provided between the cam and the bottom sleeve on the same side. One side of the transmission link is screwed to the eccentric end of the cam, and the other side is screwed to the outer end of the bottom sleeve.

[0010] The hexagonal sliding columns can move back and forth synchronously as they rotate. In the initial state, the heights of each hexagonal sliding column in the mixing tank are different, which allows the hexagonal sliding columns to work together to form a back-and-forth undulating motion as they move back and forth.

[0011] The technical solution of this utility model is used as follows:

[0012] The input and distribution of power: After the drive component starts, the power is first transmitted to the main spur gear and the main bevel gear. Since the main spur gear and the main bevel gear are coaxially connected, they rotate synchronously.

[0013] The main spur gear drives the rotation of the component spur gears that mesh with it. Since the component spur gears are fixed on the outer shaft surface of the first stirring shaft, they can drive the first stirring shaft to rotate around its own axis.

[0014] The main bevel gear drives the rotation of the surrounding component bevel gears, which are all meshed with it, downwards.

[0015] The lifting action is formed by a cam coaxially connected to the outer side of each set of drive bevel gears. When the cam rotates with the drive bevel gear, it can drive the bottom sleeve to move up and down through the transmission link screwed between the eccentric end of the cam and the outside of the bottom sleeve.

[0016] The dual stirring action is achieved by rotating the first stirring shaft to drive the synchronous rotation of the hexagonal sliding column. Since the hexagonal sliding column is screwed into the bottom rotating sleeve and will not detach, the lifting of the bottom rotating sleeve can directly drive the hexagonal sliding column to slide inside the first stirring shaft and rise and fall synchronously.

[0017] The formation of the undulating and lifting action of the array of hexagonal sliding columns is due to the fact that the initial setting height of each group of hexagonal sliding columns in the mixing tank is different during the initial installation. This means that although all the hexagonal sliding columns are performing reciprocating lifting and lowering actions during the operation, they will not be on the same horizontal plane during the lifting and lowering process due to the existence of the initial height difference.

[0018] The phase difference of each group of cams is matched with the initial height difference of each group of hexagonal sliding columns, so that each group of hexagonal sliding columns forms a wave-like undulating motion trajectory in the mixing tank.

[0019] By adopting the above technical solution, this utility model can achieve the following beneficial effects:

[0020] (1) This invention achieves the combination and three-dimensionality of stirring action, which significantly improves the uniformity of mixing of NFPP precursor preparation materials. Traditional stirring devices mostly rely on single rotational shearing, which easily produces mixing dead zones. In this invention, the first stirring action transmission component drives the first stirring shaft to rotate around its own axis through the meshing of the main spur gear and the secondary spur gear, providing basic shearing force; the second stirring action transmission component drives the cam to rotate through the transmission of the main bevel gear and the secondary bevel gear, and pushes the bottom rotating sleeve to reciprocate up and down through the transmission linkage, thereby driving the hexagonal sliding column to move axially while rotating; this compound motion breaks the laminar flow state of the material, forces the material to form a three-dimensional flow in the mixing tank, and ensures uniform mixing of components;

[0021] (2) This utility model also achieves the stirring effect of hexagonal sliding columns, which greatly improves the mixing efficiency and flexibility. During the initial installation, the setting height of each group of hexagonal sliding columns in the mixing tank is different, and the eccentric phase difference of the cam is matched with it, so that each group of hexagonal sliding columns can form a wave-shaped dynamic trajectory during the lifting and lowering process. This asynchronous and asymmetrical motion mode eliminates the material stagnation zone caused by the uniform height in traditional multi-slurry mixing, forces the material to circulate and roll up and down in the mixing tank, greatly shortens the mixing time, and is particularly suitable for the preparation of NFPP precursors that are sensitive to mixing intensity. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2This is a structural schematic diagram of the mixing tank component of this utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the drive component of this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the first stirring action transmission component of this utility model;

[0027] Figure 5 This is a schematic diagram of the transmission structure of the transfer bevel gear part of this utility model;

[0028] Figure 6 This is a first-view structural schematic diagram of the second stirring action transmission component of this utility model;

[0029] Figure 7 This is a front view of the second stirring action transmission assembly of this utility model;

[0030] Figure 8 This is a structural schematic diagram of the second stirring action transmission component of this utility model from a second perspective.

[0031] Figure label:

[0032] 1. Mixing tank component; 2. Drive assembly; 3. First stirring action transmission assembly; 4. Second stirring action transmission assembly; 101. Mixing tank body; 102. Support leg; 103. Discharge pipe; 104. Discharge sealing plate; 105. Feed pipe; 106. Feed cover; 201. Main shaft seat; 202. Main shaft; 203. Main spur gear; 204. Main bevel gear; 205. Drive motor; 206. Drive spur gear; 301. First stirring shaft seat; 302. First... 303. Stirring shaft; 304. Dividing spur gear; 405. Hexagonal slide groove; 406. Inner connecting frame; 407. Second stirring drive shaft seat; 408. Second stirring drive shaft; 409. Dividing bevel gear; 400. Hexagonal sliding column; 401. Stirring rod; 402. Bottom fixed sleeve; 403. Bottom rotating sleeve; 404. Sliding seat; 415. Sliding column; 416. Support connecting base; 417. Cam; 418. Transmission rotating seat; 419. Transmission connecting rod; 410. Eccentric shaft. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] like Figures 1-8 As shown, a mixing device for preparing NFPP precursor powder is provided. A rotatable main spur gear 203 is installed in the middle of the outer bottom end of the mixing tank 101 in the mixing tank component 1. A main bevel gear 204 is coaxially connected to the bottom end of the main spur gear 203. Several first stirring shafts 302 are evenly screwed into the bottom body of the mixing tank 101. The spur gears 303 are fixed to the outer shaft surface of the first stirring shafts 302, and each spur gear 303 meshes with the main spur gear 203.

[0036] The hexagonal sliding column 405 is slidably inserted into the first stirring shaft 302 and enters the inner cavity of the stirring tank 101. The outer bottom end of the stirring tank 101 is evenly screwed with the main bevel gear 204 as the center, and the main bevel gear 204 meshes with each group of group bevel gears 404. The outer side of each group of group bevel gears 404 is coaxially connected with a cam 412. The bottom end of the hexagonal sliding column 405 is screwed with the bottom rotating sleeve 408, and the bottom rotating sleeve 408 slides relative to the outer bottom end of the stirring tank 101.

[0037] A axial dislodgement is prevented by a limiting structure. A transmission link 414 is provided between the cam 412 and the bottom sleeve 408 on the same side. One side of the transmission link 414 is screwed to the eccentric end of the cam 412, and the other side is screwed to the outer end of the bottom sleeve 408.

[0038] When the array of hexagonal sliding columns 405 rotates, they can move back and forth synchronously. In the initial state, the set height of each group of hexagonal sliding columns 405 in the mixing tank 101 is different, which enables each group of hexagonal sliding columns 405 to form a back and forth undulating motion together when moving back and forth, instead of each group of hexagonal sliding columns 405 always maintaining the same height when moving back and forth.

[0039] The working principle is as follows:

[0040] Power input and distribution: After the drive component 2 is started, the power is first transmitted to the main spur gear 203 and the main bevel gear 204. Since the main spur gear 203 and the main bevel gear 204 are coaxially connected, they rotate synchronously.

[0041] The main spur gear 203 drives the various auxiliary spur gears 303 that are meshing with it to rotate. Since the auxiliary spur gears 303 are fixed on the outer shaft surface of the first stirring shaft 302, they can drive the first stirring shaft 302 to rotate around its own axis.

[0042] The main bevel gear 204 drives the surrounding component bevel gears 404, which are all meshing with it, to rotate downwards.

[0043] The lifting action is formed by a cam 412 coaxially connected to the outer side of each set of drive bevel gears 404. When the cam 412 rotates with the drive bevel gears 404, it can drive the bottom sleeve 408 to move up and down through the transmission link 414 screwed between the eccentric end of the cam 412 and the outside of the bottom sleeve 408.

[0044] The dual stirring action is achieved by rotating the first stirring shaft 302 to drive the synchronous rotation of the hexagonal sliding column 405. Since the hexagonal sliding column 405 is screwed into the bottom rotating sleeve 408 and will not disengage, the lifting and lowering of the bottom rotating sleeve 408 can directly drive the hexagonal sliding column 405 to slide inside the first stirring shaft 302 and lift and lower synchronously.

[0045] The undulating lifting action of the array of hexagonal sliding columns 405 is formed because, during the initial installation, the initial setting height of each group of hexagonal sliding columns 405 in the mixing tank 101 is different. This allows all the hexagonal sliding columns 405 to perform reciprocating lifting actions during operation, but due to the existence of the initial height difference, they will not be on the same horizontal plane during the lifting process.

[0046] The phase difference of each group of cams 412 and the initial height difference of each group of hexagonal sliding columns 405 are matched so that each group of hexagonal sliding columns 405 forms a wave-like undulating motion trajectory in the mixing tank 101. This motion breaks the laminar flow state of traditional mixing, so that the NFPP precursor preparation material is not only subjected to rotational shear force in the tank, but also to strong vertical convection mixing, which effectively eliminates dead corners and improves the mixing uniformity.

[0047] The specific structures of the mixing tank component 1, the drive assembly 2, and the first stirring action transmission assembly 3 are as follows: Figure 2 , Figure 3 and Figure 4 As shown, the bottom of the mixing tank 101 is uniformly fixed with support legs 102, the discharge pipe 103 is connected to one side of the bottom of the mixing tank 101, the feed pipe 105 is connected to one side of the top of the mixing tank 101, a movable discharge sealing plate 104 is inserted into one side of the side wall of the discharge pipe 103, which can realize the opening and closing of the discharge pipe 103, and a detachable feed cover 106 is covered at the top opening of the feed pipe 105, so that the material to be mixed can be added into the mixing tank 101 through the feed pipe 105.

[0048] A main shaft seat 201 is fixedly connected to the middle of the outer bottom end of the mixing tank 101. The main shaft 202 is screwed into the main shaft seat 201. The main spur gear 203 and the main bevel gear 204 are both inserted into the main shaft 202.

[0049] A drive motor 205 is fixedly installed on the bottom of the mixing tank 101. A drive spur gear 206 is inserted in the shaft of the drive motor 205, and the drive spur gear 206 meshes with the main spur gear 203. The drive motor 205 can be started by the control system, which drives the drive spur gear 206 and the main spur gear 203 to form a transmission, so that the main spur gear 203 and the main bevel gear 204 rotate coaxially.

[0050] The bottom of the mixing tank 101 is uniformly installed and fixed with the main shaft seat 201 as the center. The first mixing shaft 302 is screwed into the first mixing shaft seat 301. The hexagonal groove 304 is opened in the middle of the first mixing shaft 302. The hexagonal sliding column 405 is slidably inserted into the hexagonal groove 304.

[0051] The specific structure of the second stirring action transmission component 4 is as follows: Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, an inner connecting frame 401 is fixedly connected between the inner middle parts of the support leg 102. The second stirring drive shaft seat 402 is evenly fixed at the top middle of the inner connecting frame 401. The second stirring drive shaft 403 is screwed into the second stirring drive shaft seat 402. The split bevel gear 404 on the same side is inserted into the second stirring drive shaft 403. All the second stirring drive shaft seats 402 are concentrated in the gaps formed between the set of split bevel gears 404, so as not to interfere with the cooperation between the split bevel gear 404 and the main bevel gear 204.

[0052] Each set of hexagonal sliding columns 405 has a stirring rod 406 fixedly arranged on the upper end of the main body. The stirring rod 406 is corner-shaped, and its fixed end is directly welded to the main body of the hexagonal sliding column 405.

[0053] The bottom end of the hexagonal sliding column 405 is fixed with a bottom fixed sleeve 407. The bottom rotating sleeve 408 is screwed to the bottom fixed sleeve 407 and will not detach. The outer bottom end of the mixing tank 101 is uniformly fixed with sliding columns 410. The bottom end of the sliding column 410 is fixedly connected to the inner connecting frame 401 through a support connecting base 411, which can improve the support strength of the sliding column 410. The outside of the bottom rotating sleeve 408 is fixed with a sliding seat 409. The sliding seat 409 on the same side is slidably connected to the sliding column 410.

[0054] The center end of the cam 412 is fixedly connected to the second stirring drive shaft 403. The eccentric end of the cam 412 is fixed with an eccentric shaft 415. One end of the bottom sleeve 408 is fixed with a drive seat 413. One side of the drive connecting rod 414 is screwed to the eccentric shaft 415, and the other side is screwed to the drive seat 413.

[0055] After the split bevel gear 404 drives the cam 412 to rotate coaxially through the second stirring transmission shaft 403, the eccentric shaft 415 set at the eccentric end of the cam 412 and the swivel joint formed with one side of the transmission connecting rod 414, and the swivel joint formed with the other side of the transmission connecting rod 414 and the transmission rotating seat 413, can drive the bottom rotating sleeve 408 to move up and down reciprocally within a certain range. The sliding joint formed by the sliding seat 409 and the sliding column 410, and the sliding joint formed by the hexagonal sliding column 405 and the hexagonal sliding groove 304, together constitute the support foundation for the reciprocating up and down movement of the bottom rotating sleeve 408 and the hexagonal sliding column 405, which can ensure that the up and down movement of the hexagonal sliding column 405 forms a safe and reliable stirring action.

[0056] In this embodiment, when the mixing device is assembled, strict sealing measures are taken for all mating positions involving relative sliding or assembly connection of the mixing tank 101, such as adding sealing gaskets, sealing rings, and applying sealant, to ensure that the material will not leak and contaminate the transmission components during the preparation of NFPP precursor powder, and to prevent external impurities from entering the mixing tank 101 and affecting the purity of the powder.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A stirring and mixing apparatus for the preparation of NFPP precursor powder, comprising a stirring tank component (1), characterized in that: It also includes a drive assembly (2), a first stirring action transmission assembly (3), and a second stirring action transmission assembly (4); The mixing tank component (1) includes a mixing tank body (101), the drive assembly (2) includes a main bevel gear (204), and the first stirring action transmission assembly (3) includes a spur gear (303). A rotatable main spur gear (203) is installed in the middle of the outer bottom end of the mixing tank body (101). The main bevel gear (204) is connected to the bottom end of the main spur gear (203). A first stirring shaft (302) is evenly screwed into the bottom body of the mixing tank body (101). The spur gear (303) is fixed to the outer shaft surface of the first stirring shaft (302), and each spur gear (303) meshes with the main spur gear (203). The second stirring action transmission assembly (4) includes a hexagonal slide column (405), which is slidably inserted into the first stirring shaft (302). The bottom of the stirring tank (101) is evenly connected with a split bevel gear (404), and the main bevel gear (204) meshes with each split bevel gear (404). A cam (412) is connected to the outer side of each split bevel gear (404). A bottom sleeve (408) is slidably connected to the bottom of the stirring tank (101) and the position opposite to each set of hexagonal slide columns (405). The bottom end of the hexagonal slide column (405) is connected to the bottom sleeve (408). A transmission link (414) is provided between the cam (412) on the same side and the bottom sleeve (408). One side of the transmission link (414) is connected to the eccentric end of the cam (412), and the other side is connected to the outer end of the bottom sleeve (408). The different heights of the hexagonal sliding columns (405) in the mixing tank (101) enable the hexagonal sliding columns (405) to work together to form a reciprocating undulating motion when they move up and down.

2. The stirring and mixing apparatus for preparing NFPP precursor powder according to claim 1, characterized in that: The mixing tank component (1) also includes a discharge pipe (103) and a feed pipe (105). The bottom of the mixing tank body (101) is evenly fixed with support legs (102). The discharge pipe (103) is connected to one side of the bottom of the mixing tank body (101), and the feed pipe (105) is connected to one side of the top of the mixing tank body (101). A discharge sealing plate (104) is inserted into one side of the side wall of the discharge pipe (103), and a feed cover (106) is attached to the top opening of the feed pipe (105).

3. The stirring and mixing apparatus for preparing NFPP precursor powder according to claim 2, characterized in that: The drive assembly (2) also includes a main shaft (202). A main shaft seat (201) is fixedly connected to the middle of the outer bottom end of the mixing tank (101). The main shaft (202) is screwed into the main shaft seat (201). The main spur gear (203) and the main bevel gear (204) are both inserted into the main shaft (202). A drive motor (205) is installed and fixed at the outer bottom end of the mixing tank (101). A drive spur gear (206) is inserted into the shaft of the drive motor (205), and the drive spur gear (206) meshes with the main spur gear (203).

4. A stirring and mixing apparatus for preparing NFPP precursor powder according to claim 1, 2, or 3, characterized in that: The first stirring action transmission assembly (3) also includes a hexagonal slide groove (304). A first stirring shaft seat (301) is uniformly installed and fixed in the bottom body of the stirring tank (101). A first stirring shaft (302) is screwed into the first stirring shaft seat (301). The hexagonal slide groove (304) is opened in the middle of the first stirring shaft (302). A hexagonal slide column (405) is slidably inserted into the hexagonal slide groove (304).

5. A stirring and mixing apparatus for preparing NFPP precursor powder according to claim 2 or 3, characterized in that: The second stirring action transmission assembly (4) also includes a second stirring transmission shaft (403). An inner connecting frame (401) is fixed between the inner middle of the support leg (102). A second stirring transmission shaft seat (402) is evenly fixed at the top middle of the inner connecting frame (401). The second stirring transmission shaft (403) is screwed into the second stirring transmission shaft seat (402). The split bevel gear (404) on the same side is inserted into the second stirring transmission shaft (403). Stirring rods (406) are arranged and fixed at the upper end of the main body of each set of hexagonal sliding columns (405).

6. A stirring and mixing apparatus for preparing NFPP precursor powder according to claim 5, characterized in that: The second stirring action transmission assembly (4) also includes a support connecting base (411), a bottom fixed sleeve (407) fixed at the bottom end of the hexagonal sliding column (405), a bottom rotating sleeve (408) screwed to the bottom fixed sleeve (407), a sliding column (410) evenly fixed at the outer bottom end of the stirring tank (101), the bottom end of the sliding column (410) and the inner connecting frame (401) are fixedly connected through the support connecting base (411), and the outer side of the bottom rotating sleeve (408) A sliding seat (409) is fixed, and the sliding seat (409) on the same side is slidably connected to the sliding column (410). The center end of the cam (412) is fixed to the second stirring drive shaft (403). An eccentric shaft (415) is fixed to the eccentric end of the cam (412). A transmission rotary seat (413) is fixed to one end of the bottom rotating sleeve (408). One side of the transmission connecting rod (414) is screwed to the eccentric shaft (415), and the other side is screwed to the transmission rotary seat (413).

7. A stirring and mixing apparatus for preparing NFPP precursor powder according to claim 1, 2, 3 or 6, characterized in that: In the initial state, the set height of each group of hexagonal sliding columns (405) in the mixing tank (101) is different. When each group of hexagonal sliding columns (405) moves up and down and rotates synchronously, they can form a reciprocating undulating motion together.

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