A high-efficiency fiberization unit and a method for fiberizing material

Abstract

The application provides a high-efficiency fiberization unit and a material fiberization method, which comprise a feeding system, a constant-pressure fiberization kneader and a gas-blowing granulator. The kneader comprises a heatable cavity, a piston constant-pressure top cover and a kneading wheel, the constant pressure of the cavity is ensured by controlling the displacement of the piston top cover, and the bottom of the heatable cavity is provided with an electric sliding plate valve. The gas-blowing granulator is connected with the kneader through a connector and comprises a closed powder collecting barrel and a scraper screen granulation assembly. The scraper screen assembly comprises a conical screen, a triangular scraper and a speed reducer motor, the tip of the screen is fixed to the inner wall of the collecting barrel downward, the scraper is installed on the output shaft of the motor in close contact with the inner wall of the screen, and the motor is internally provided with a gas guide pipe in communication with a gas source. The piston constant-pressure top cover, the heatable cavity and the electric sliding plate valve constitute a sealed cavity of the kneader, the constant pressure of the cavity of the kneader is maintained by the piston constant-pressure top cover, the seamless switching of the fiberization and the granulation processes is realized by the electric sliding plate valve, and the continuity of the overall operation is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of powder fiberization processing equipment, in particular to a high-efficiency fiberization unit and a material fiberization method. BACKGROUND

[0002] In the dry electrode film forming process, the fibrillation process of polytetrafluoroethylene (PTFE) is a key technical link that determines the performance of the electrode. Currently, the mainstream methods of PTFE fiberization mainly include three kinds: shear fiberization by high-speed mixer, impact fiberization by air jet mill, and fiberization material preparation by double screw extruder. Although these methods have their own characteristics, they all face some common challenges in practical application.

[0003] First of all, no matter which process route, there is a common problem of open fiberization environment space in the operation process, which leads to poor controllability and difficulty in ensuring the consistency of fiber network structure. Specifically: when using a high-speed mixer for shear fiberization, due to the uneven distribution of powder particles in the shear field, local over-shearing and under-shearing phenomena coexist, which directly affects the quality of the final product. Although the air jet mill impact fiberization can achieve effective collision and dispersion of the powder by means of high-speed airflow, the instability of the turbulent field makes the degree of fiberization fluctuate greatly, making it difficult to maintain stable product quality. Although the double screw extruder mechanical fiberization has the advantage of continuous production, it is difficult to accurately control the global shear strength due to the influence of the complex flow field characteristics of the screw meshing area, thereby affecting the uniformity and effect of fiberization.

[0004] The common core problem of the above processes is the failure to build a stable and accurately controllable fiberization dynamics environment. As a result, the final powder not only contains short PTFE fibers formed by excessive disentanglement, but also residual agglomerated particles that have not been fully fibrillated. This heterogeneity in microstructure will directly adversely affect the consistency of the mechanical strength and ion transport performance of the electrode film. SUMMARY

[0005] In view of the low working efficiency, poor continuity, poor sealing and poor particle uniformity of existing fiberization equipment, the present application provides a high-efficiency fiberization unit and a material fiberization method. The piston constant pressure cover and the heatable chamber, the electric sliding plate valve constitute a sealed kneader inner cavity, cooperate with the piston constant pressure cover to keep the constant pressure of the kneader inner cavity, so as to ensure the stability and uniformity of the fiberization process. At the same time, the electric sliding plate valve realizes seamless switching between the fiberization and granulation processes, improving the continuity and efficiency of the overall operation.

[0006] The present application achieves the above technical purposes through the following technical means.

[0007] An efficient fibrillating unit, comprising a feeding system, a constant-pressure fibrillating kneader, and a pneumatic granulator arranged in sequence from top to bottom;

[0008] The constant-pressure fibrillating kneader includes a heatable chamber, a piston-type constant-pressure top cover, and kneading wheels; the kneading wheels are arranged in the heatable chamber. The upper and lower ends of the heatable chamber are open, and the piston-type constant-pressure top cover is slidably installed in the heatable chamber through the upper opening. An electric slide valve is provided at the lower opening. The piston-type constant-pressure top cover, the heatable chamber, and the electric slide valve form a sealed kneader inner cavity; the upper part of the piston-type constant-pressure top cover is connected to a lifting device, and the constant pressure in the kneader inner cavity is maintained by controlling the up and down displacement of the piston-type constant-pressure top cover;

[0009] The pneumatic granulator is connected to the constant-pressure fibrillating kneader through a connector, and includes a closed powder collection barrel and a scraping and sieving granulation component located in its upper part; the upper end of the closed powder collection barrel is open and is对接 with the lower opening of the connector; the scraping and sieving granulation component includes a conical sieve, a triangular scraper, and a reduction motor; the conical sieve is fixed on the inner wall of the closed powder collection barrel with its tip facing downwards, the triangular scraper is installed on the output shaft of the reduction motor and is located above the conical sieve, fitting with the inner wall of the conical sieve; a gas guide pipe connected to a gas source is provided inside the reduction motor.

[0010] Furthermore, the kneading wheels include a first kneading wheel and a second kneading wheel arranged in parallel. The shaft of the first kneading wheel is the driving shaft, on which male-type blades are assembled; the second kneading wheel is the driven wheel, which is driven by a gear set with the driving wheel, and female-type blades are assembled on it; the male-type blades and the female-type blades rotate relatively, and the minimum gap between the male-type blades and the female-type blades is 0.1 - 1 mm, and the rotational speed of the male-type blades is 1.5 - 3 times that of the female-type blades.

[0011] Furthermore, the cross-section of the male-type blade is in the shape of a blade. Taking the axis of the male-type blade as the coordinate origin O, the line connecting the origin O and the right endpoint of the male-type blade is the X-axis, and the upper half edge line L1 is an arc structure: setting the distance from the origin O to the right endpoint as s, the circular arc center coordinates of the edge line L1 are (a1, b1), satisfying 0.5s < a1 < 0.75s and -0.25s < b1 < -0.1s, and the circular arc radius R1 of the edge line L1 satisfies 0.4s < R1 < 0.7s;

[0012] The lower half edge line L2 is a sine curve: y2 = a2·sin(b2x - c2), where 0.2s < a2 < 0.4s, b2 < 1, c2 > 1;

[0013] The radius R of the middle shaft of the male-type blade g is 0.2s < R g < 0.5s.

[0014] Further, the female blade section is in the shape of a sickle, with the female blade axis as the coordinate origin O, and the line connecting the origin O and the right end point of the female blade as the X axis, the upper edge line L3 of the female blade being in the shape of a lower convex circular arc, with the distance from the origin O to the right end point being s, the circular arc center coordinates of the edge line L3 being (a3, b3), satisfying 0.5s

[0015] The lower edge line of the female blade is composed of two circular arcs, the left edge line L4 being an upper convex circular arc, the circular arc center coordinates of the edge line L4 being (a4, b4), satisfying 0.2s

[0016] The radius of the female blade middle axis is R m m <0.5s.

[0017] Further, the electric sliding plate valve comprises a valve body, a sliding plate and an electric actuator, the valve body being installed at the lower end opening of the heatable chamber, the sliding plate being slidingly installed on the valve body and being driven to reciprocate by the electric actuator, a metal sealing surface with Ra≤0.8μm being arranged between the sliding plate and the valve body, and a fluorine rubber elastic gasket being arranged between the sliding plate and the valve body.

[0018] The upper end surface of the sliding plate is in the shape of "ω" and matches the rotation track of the male blade and the female blade, the minimum gap between the male blade, the female blade, the heatable chamber and the sliding plate being 0.1-1mm, and the heating temperature of the heatable chamber being 30-200℃.

[0019] Preferably, the upper end of the connector is square-shaped and has the same shape as the lower end opening of the heatable chamber, and the lower end is circular-shaped and has a size suitable for the upper end opening of the closed powder collecting barrel.

[0020] Further, the aperture of the conical screen is 0.1-2mm, and the speed ratio of the triangular scraper and the speed reducer motor is 1:(1.2-1.5).

[0021] Further, the feeding system comprises a conical mixer and a pneumatic feeding valve, and the material in the conical mixer is added to the constant-pressure fiberizing kneader through the pneumatic feeding valve.

[0022] Further, the control system comprises: ​

[0023] A pressure sensor installed in the inner cavity of the kneader is used to detect the pressure value of the inner cavity of the kneader in real time.

[0024] A detection device for detecting the current or torque of the driving device of the driving shaft of the kneading wheel, which is an ammeter or a torque sensor.

[0025] And a controller is used to collect the pressure value of the inner cavity of the kneader and the working driving force of the driving shaft of the kneading wheel, and control the opening and closing of the pneumatic feeding valve and the electric sliding plate valve, and the lifting of the piston constant pressure top cover.

[0026] The method for material fiberization based on the high-efficiency fiberization machine group includes kneading fiberization treatment and scraping screen treatment.

[0027] Before starting the kneading fiberization treatment, first ensure that the electric sliding plate valve is in the closed state, then the controller controls the lifting of the piston constant pressure top cover to maintain the constant pressure of the inner cavity of the kneader, and then the controller controls the addition of the material in the conical mixer to the constant pressure fiberization kneader through the pneumatic feeding valve, and starts the kneading wheel to start the kneading fiberization treatment; the material includes main powder and fiberizable polytetrafluoroethylene (PTFE) powder, wherein the main powder is selected from at least one of the battery positive / negative electrode material mixture, the polyphenylene sulfide powder or the solid electrolyte powder.

[0028] During the kneading fiberization, the detection device detects the current or torque of the driving device of the driving shaft of the kneading wheel in real time and sends it to the controller; the controller opens the electric sliding plate valve according to the working driving force of the driving shaft of the kneading wheel to pour the powder in the inner cavity of the kneader into the conical screen below, and then closes the electric sliding plate valve, and the kneading fiberization treatment is completed.

[0029] The steps of the scraping screen treatment are as follows:

[0030] After the electric sliding plate valve is opened, the controller starts the speed reducer to drive the triangular scraper to rotate along the inner wall of the conical screen, and at the same time, the controller opens the gas source to spray high-pressure gas through the gas guide pipe; when the powder falling into the conical screen is completely crushed and sieved and falls into the bottom of the closed powder collecting barrel, the controller closes the speed reducer and the gas source, and the scraping screen treatment is completed.

[0031] Further, the adjustment range of the pressure in the inner cavity of the kneader is 0.1-3MPa, the rotating speed of the triangular scraper is 2000rmp-3000rmp, and the pressure of the high-pressure gas is 0.05-0.3MPa.

[0032] The beneficial effects of the present application are as follows:

[0033] 1. The present application utilizes a piston constant pressure cover to form a sealed kneader cavity with a heatable chamber and an electric sliding plate valve, which cooperates with the piston constant pressure cover to maintain the constant pressure of the kneader cavity, effectively avoiding the problem of fiber breakage or agglomeration caused by pressure fluctuation, thereby significantly improving the uniformity of fiberization and the strength of the finished product. In addition, the present application further ensures the stability and uniformity of the fiberization process through constant temperature control technology.

[0034] 2. The present application adopts a male blade in the shape of a leaf and a female blade in the shape of a sickle, both rotating at a speed difference of 1.5 to 3 times, accelerating fiber disentanglement through strong shearing and stretching synergy, greatly improving fiberization efficiency and reducing energy consumption. The present application realizes uniform coverage and dead angle-free treatment of powder through precisely designed blade gap combined with size parameter optimization, strictly controlling the fiber diameter deviation within 5%.

[0035] 3. The application of the electric sliding plate valve in the present application realizes seamless connection of feeding, cooperates with the integrated screening-granulating integrated process, reduces the idle time of the equipment by 90%, and increases the production capacity by 30%. And the electric sliding plate valve adopts a double sealing mechanism of metal hard sealing surface and fluororubber elastic gasket, combined with a closed powder collecting barrel, reduces the dust emission to 1 mg / m 3 The following meets the standard requirements of a clean room.

[0036] 4. The present application judges the end point of fiberization by collecting the working driving force of the kneading wheel driving shaft in real time, thereby avoiding the errors that may be caused by relying on human experience and improving the automation level of the whole device.

[0037] 5. The present application sprays high-pressure gas while scraping the screen, which not only effectively prevents powder from penetrating into the mechanical gap of the reduction motor, ensuring the smoothness of equipment operation, but also cooperates with the conical screen and triangular scraper to improve the uniformity of screened particles to 98%, and the screening efficiency to more than 95%, so that it can meet the process requirements of subsequent roll forming.

[0038] 6. The high-efficiency fiberization unit described in the present application is suitable for processing various high-value-added powders such as battery positive / negative materials, polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), and solid-state electrolyte, which can meet the requirements of length-diameter ratio ≥100:1, and can meet the roll forming process requirements of ultra-thin electrodes with a thickness of less than 5μm. The constant pressure fiberization kneader and the granulator can operate independently or in series, and adapt to multiple scene requirements such as 5L chamber laboratory pilot test to 2000L chamber industrial production, showing strong adaptability. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a front view of the high-efficiency fiberization unit described in the present application.

[0040] Figure 2 is a side sectional view of the high-efficiency fiberization unit.

[0041] Figure 3 is a structural schematic diagram of the male blade.

[0042] Figure 4 is a structural schematic diagram of the female blade.

[0043] Figure 5 is a structural schematic diagram of the electric sliding plate valve.

[0044] Figure 6 is a front sectional view of the state of the fiberized material block crushing and screening after the high-efficiency fiberization unit.

[0045] Figure 7 is a side sectional view of the state of the fiberized material block crushing and screening after the high-efficiency fiberization unit.

[0046] The reference signs are as follows:

[0047] 1 - conical mixer; 2 - pneumatic feeding valve; 3 - heatable chamber; 4 - piston constant pressure top cover; 5 - electric sliding plate valve; 6 - male blade; 7 - female blade; 8 - closed powder collecting barrel; 9 - connector; 10 - conical screen; 11 - triangular scraper; 12 - speed reducer motor. DETAILED DESCRIPTION

[0048] The application will be further described below in conjunction with the drawings and specific examples, but the protection scope of the application is not limited thereto.

[0049] Example 1

[0050] The high-efficiency fiberization unit described in the present embodiment comprises, from top to bottom, an upper feeding system, a constant pressure fiberization kneader, a pneumatic granulator, and a control system, Figure 1 、 2 are respectively a front sectional view and a side sectional view of the high-efficiency fiberization unit described in the present embodiment.

[0051] The upper feeding system comprises a conical mixer 1 and a pneumatic feeding valve 2, and the material in the conical mixer 1 is added to the constant pressure fiberization kneader through the pneumatic feeding valve 2. The material placed in the conical mixer 1 comprises main powder and fiberizable polytetrafluoroethylene (PTFE) powder, wherein the main powder is at least one selected from the group consisting of battery positive / negative electrode material mixture, polyphenylene sulfide powder, or solid electrolyte powder.

[0052] The constant pressure fiberization kneader comprises a heatable chamber 3, a piston constant pressure top cover 4, and kneading wheels. The kneading wheels are arranged in the heatable chamber 3 and comprise first and second kneading wheels arranged side by side. The shaft of the first kneading wheel is a driving shaft, and a male blade 6 is assembled on the driving shaft. The second kneading wheel is a driven wheel, and the driving shaft and the driven wheel are connected through a gear set. A female blade 7 is assembled on the driven wheel. The male blade 6 and the female blade 7 rotate oppositely, and the minimum gap between the male blade 6 and the female blade 7 is 0.3 mm. The rotating speed of the male blade is twice that of the female blade.

[0053] The male blade 6 is in the shape of a blade. The shaft center of the male blade 6 is the coordinate origin O, and the line connecting the origin O and the right end point of the male blade 6 is the X axis. The upper half edge line L1 of the male blade 6 is in the shape of a circular arc. The distance from the origin O to the right end point is s, the center coordinates of the circular arc of the edge line L1 are (a1, b1), and 0.5s < a1 < 0.75s and -0.25s < b1 < -0.1s are satisfied, and the radius R1 of the circular arc of the edge line L1 satisfies 0.4s < R1 < 0.7s. The lower half edge line L2 is a sine curve: y2 = a2 sin (b2x-c2), where 0.2x < a2 < 0.4x, b2 < 1, and c2 > 1, and the radius R g of the middle shaft of the male blade 6 satisfies 0.2s < R g < 0.5s, Figure 3 The structure of the male blade is shown in the schematic view of the embodiment.

[0054] The female blade 7 is in the shape of a sickle. The shaft center of the female blade 7 is the coordinate origin O, and the line connecting the origin O and the right end point of the female blade 7 is the X axis. The upper half edge line L3 of the female blade 7 is in the shape of a lower convex circular arc. The distance from the origin O to the right end point is s, the center coordinates of the circular arc of the edge line L3 are (a3, b3), and 0.5s < a3 < 0.8s and 0.25s < b3 < 0.5s are satisfied, and the radius R3 of the circular arc of the edge line L3 satisfies 0.4s < R3 < 0.7s.

[0055] The lower half edge line of the female blade is composed of two circular arcs. The left edge line L4 is an upper convex circular arc, the center coordinates of the edge line L4 are (a4, b4), and 0.2s < a4 < 0.4s and -0.7s < b4 < -0.4s are satisfied, and the radius R4 satisfies 0.2s < R4 < 0.5s. The right edge line L5 is a lower concave circular arc, the center coordinates of the edge line L5 are (a5, b5), and 0.4s < a5 < 0.8s and 0.05s < b5 < 0.2s are satisfied, and the radius R5 satisfies 0.2s < R5 < 0.5s, and the radius R m of the middle shaft of the female blade 7 satisfies 0.2s < R m < 0.5s, Figure 4 The structure of the female blade is shown in the schematic view of the embodiment.

[0056] The upper and lower ends of the heatable chamber 3 are open, the heating temperature of the heatable chamber 3 is 80℃, and the piston type constant pressure cover 4 is slidably installed in the heatable chamber 3 through the upper end opening, and the electric sliding plate valve 5 is arranged at the lower end opening. Figure 5 The valve body is installed at the lower end opening of the heatable chamber 3, the sliding plate is slidably installed on the valve body, and is driven to reciprocate by the electric actuator. The metal sealing surface between the sliding plate and the valve body has an Ra≤0.8μm, and a fluorine rubber elastic gasket is arranged between the sliding plate and the valve body. The upper end surface of the sliding plate is in the shape of "ω", and matches the rotation track of the male paddle 6 and the female paddle 7. The minimum gap between the male paddle 6, the female paddle 7, the heatable chamber 3 and the sliding plate is 0.1-1mm. The piston type constant pressure cover 4, the heatable chamber 3 and the electric sliding plate valve 5 form a sealed kneader inner cavity. The upper part of the piston type constant pressure cover 4 is connected with the lifting device, and the displacement of the piston type constant pressure cover 4 is controlled to keep the constant pressure of 0.3MPa in the kneader inner cavity.

[0057] The air blowing granulator is connected with the constant pressure fiberization kneader through the connector 9. The upper end of the connector 9 is square, and has the same shape as the lower end opening of the heatable chamber 3. The lower end is circular, and has a size suitable for the upper end opening of the closed powder collecting barrel 8. The air blowing granulator comprises the closed powder collecting barrel 8 and the scraper screen granulating assembly arranged in the upper part of the closed powder collecting barrel 8. The upper end of the closed powder collecting barrel 8 is open, and is connected with the lower end opening of the connector 9. The scraper screen granulating assembly comprises a conical screen 10, a triangular scraper 11 and a speed reducer 12. The conical screen 10 is fixed on the inner wall of the closed powder collecting barrel 8, and the tip thereof is downward. The aperture of the conical screen 10 is 1mm. The triangular scraper 11 is arranged on the output shaft of the speed reducer 12, and the speed ratio of the triangular scraper 11 and the speed reducer 12 is 1:1.3. The triangular scraper 11 is arranged above the conical screen 10, and is in close contact with the inner wall of the conical screen 10. The rotating speed of the triangular scraper 11 is 2000rmp. The speed reducer 12 is internally provided with a gas guide pipe connected with the gas source, and the gas pressure of the output high pressure gas is 0.1MPa.

[0058] The control system comprises a pressure sensor installed in the kneader inner cavity, which is used for detecting the pressure value of the kneader inner cavity in real time; a detection device for detecting the current or torque of the driving device of the kneader driving shaft, and the detection device is a current meter or a torque sensor; and a controller for collecting the pressure value of the kneader inner cavity and the working driving force of the kneader driving shaft, and controlling the opening and closing of the pneumatic feeding valve 2 and the electric sliding plate valve 5, and the lifting of the piston type constant pressure cover 4.

[0059] The material fiberization method using the above high-efficiency fiberization unit includes kneading fiberization treatment and scraping screen treatment, and the steps of the kneading fiberization treatment are as follows:

[0060] Before starting the kneading fiberization treatment, first ensure that the electric sliding plate valve 5 is in a closed state, then the controller keeps the constant pressure in the kneader cavity by controlling the lifting of the piston constant pressure cover 4, then the controller controls the addition of the material in the conical mixer 1 to the constant pressure fiberization kneader through the pneumatic feeding valve 2, and starts the kneading wheel to start the kneading fiberization treatment. The material includes graphite and fiberization polytetrafluoroethylene powder.

[0061] During the kneading fiberization, the detection device detects the driving current or torque of the kneading wheel driving shaft in real time and sends it to the controller; the controller opens the electric sliding plate valve 5 according to the working driving force of the kneading wheel driving shaft, and pours the powder in the kneader cavity into the conical screen 10 below, then closes the electric sliding plate valve 5, and the kneading fiberization treatment is completed.

[0062] The steps of the scraping screen treatment are as follows:

[0063] After the electric sliding plate valve 5 is opened, the controller starts the speed reducer motor 12 to drive the triangular scraper 11 to rotate along the inner wall of the conical screen 10, and at the same time, the controller opens the gas source to spray high-pressure gas through the gas guide pipe. After the powder falling into the conical screen 10 is completely crushed and screened and falls into the bottom of the closed powder collecting barrel 8, the controller closes the speed reducer motor 12 and the gas source, and the scraping screen treatment is completed. Figure 6 、 7 The front and side sectional views of the broken and screened state of the material block after fiberization of the high-efficiency fiberization unit, respectively.

[0064] Collect the particles after the above scraping screen treatment and roll them into a film, PTFE≤1%, and the tensile strength is ≥5Mpa.

[0065] Example 2

[0066] The difference between this embodiment and Example 1 is that the ternary 811 positive electrode powder, Super-P, CNT and PTFE are placed in the conical mixer 1 according to the mass ratio of 96.5:1:0.5:2, the pressure in the kneader cavity is kept at 0.8MPa, the pore size of the conical screen 10 is 300-500μm, and the rest of the structure and method are unchanged.

[0067] Collect the particles after the scraping screen treatment in this embodiment and roll them into a film, and the tensile strength is ≥4MPa.

[0068] Example 3

[0069] The difference between this embodiment and embodiment 1 is that the polyphenylene sulfide powder and PTFE are placed in the mixer 1 at a mass ratio of 94:6, the pressure in the kneader cavity is kept at 0.6 MPa, the aperture of the conical screen 10 is 2 mm, and the rest of the structure and method are unchanged.

[0070] The particles treated by the screen in this embodiment are collected and rolled into a film, the porosity is ≤3%, and the tensile strength is ≥2 MPa.

[0071] The above embodiments are preferred embodiments of the present application, but the present application is not limited to the above embodiments, and any obvious improvement, replacement or modification made by those skilled in the art without departing from the essential content of the present application shall fall within the protection scope of the present application.

Claims

1. A high efficiency fiberization train, characterized by, The device comprises, from top to bottom, a feeding system, a constant-pressure fiberizing kneader, and a gas-blowing granulator. The constant-pressure fiberizing kneader comprises a heatable chamber (3), a piston constant-pressure top cover (4), and a kneading wheel. The kneading wheel is arranged in the heatable chamber (3) and comprises first and second kneading wheels arranged side by side. The first kneading wheel is equipped with male blades (6), and the second kneading wheel is equipped with female blades (7). The male blades (6) and the female blades (7) rotate relative to each other. The male blades (6) are blade-shaped in cross section. The male blades (6) are arranged with the male blade (6) axis as the coordinate origin O, and the line connecting the origin O and the right end point of the male blade (6) as the X axis. The upper half of the edge line L1 is a circular arc structure. The distance from the origin O to the right end point is set as s, the circular arc center coordinates of the edge line L1 are (a1, b1), and 0.5s < a1 < 0.75s and -0.25s < b1 < -0.1s are satisfied. The radius R1 of the edge line L1 satisfies 0.4s < R1 < 0.7s. The lower half of the edge line L2 is a sine curve: y2 = a2·sin(b2x -c2), where 0.2s < a2 < 0.4s, b2 < 1, and c2 > 1. The female blades (7) are sickle-shaped in cross section. The female blades (7) are arranged with the female blade (7) axis as the coordinate origin O, and the line connecting the origin O and the right end point of the female blade (7) as the X axis. The upper half of the edge line L3 is a lower convex circular arc structure. The distance from the origin O to the right end point is set as s, the circular arc center coordinates of the edge line L3 are (a3, b3), and 0.5s < a3 < 0.8s and 0.25s < b3 < 0.5s are satisfied. The radius R3 of the edge line L3 satisfies 0.4s < R3 < 0.7s. The lower half of the edge line is composed of two circular arcs. The left edge line L4 is an upper convex circular arc, the circular arc center coordinates of the edge line L4 are (a4, b4), and 0.2s < a4 < 0.4s and -0.7s < b4 < -0.4s are satisfied. The radius R4 satisfies 0.2s < R4 < 0.5s. The right edge line L5 is a lower concave circular arc, the circular arc center coordinates of the edge line L5 are (a5, b5), and 0.4s < a5 < 0.8s and 0.05s < b5 < 0.2s are satisfied. The radius R5 satisfies 0.2s < R5 < 0.5s. The heatable chamber (3) is open at the upper and lower ends, and the piston constant-pressure top cover (4) is slidably arranged in the heatable chamber (3) through the upper end opening. An electric sliding plate valve (5) is arranged at the lower end opening. The piston constant-pressure top cover (4), the heatable chamber (3), and the electric sliding plate valve (5) form a sealed kneader inner cavity. The upper part of the piston constant-pressure top cover (4) is connected with a lifting device, and the displacement of the piston constant-pressure top cover (4) is controlled to maintain the constant pressure of the kneader inner cavity. The air blowing granulator is connected with the constant pressure fiberization kneader through the connector (9), and comprises a closed powder collecting barrel (8) and a scraper screen granulating assembly located at the upper part in the closed powder collecting barrel (8); the upper end of the closed powder collecting barrel (8) is open and is connected with the lower end opening of the connector (9); the scraper screen granulating assembly comprises a conical screen (10), a triangular scraper (11) and a speed reducer (12); the conical screen (10) is fixed on the inner wall of the closed powder collecting barrel (8) and the tip is downward, the triangular scraper (11) is installed on the output shaft of the speed reducer (12) and is located above the conical screen (10) and is in contact with the inner wall of the conical screen (10); the speed reducer (12) is internally provided with a gas guide pipe communicated with the gas source.

2. The high efficiency fiberization train of claim 1, wherein, The shaft of the first kneading wheel is a driving shaft, the second kneading wheel is a driven wheel, and the driving shaft and the driven wheel are driven through a gear set; the minimum gap between the male paddle (6) and the female paddle (7) is 0.1-1mm, and the rotating speed of the male paddle is 1.5-3 times of that of the female paddle.

3. The high efficiency fiberizing assembly of claim 1 wherein, The radius R of the middle shaft of the male blade (6) g is 0.2s < R g <0.5s.

4. The high efficiency fiberizing assembly of claim 1 wherein, The radius of the intermediate shaft of the female blade (7) is R m is 0.2s < R m <0.5s.

5. The high efficiency fiberizing assembly of claim 1 wherein, The electric sliding plate valve (5) comprises a valve body, a sliding plate and an electric actuator; the valve body is installed at the lower end opening of the heatable chamber (3), the sliding plate is slidingly installed on the valve body and is driven by the electric actuator to make horizontal reciprocating motion; metal sealing surfaces with Ra≤0.8μm are arranged between the sliding plate and the valve body, and fluorine rubber elastic gaskets are arranged between the sliding plate and the valve body; The upper end surface of the sliding plate is in the shape of "ω" and matches the rotating tracks of the male paddle (6) and the female paddle (7), the minimum gap between the male paddle (6), the female paddle (7) and the heatable chamber (3) and the sliding plate is 0.1-1mm; the heating temperature of the heatable chamber (3) is 30-200℃.

6. The high efficiency fiberizing machine set of claim 1, wherein, The upper end of the connector (9) is square-shaped and is the same as the shape of the lower end opening of the heatable chamber (3), and the lower end is circular-shaped and is suitable for the size of the upper end opening of the closed powder collecting barrel (8).

7. The high efficiency fiberizing assembly of claim 1 wherein, The aperture of the conical screen (10) is 0.1-2mm, and the rotating speed ratio of the triangular scraper (11) to the speed reducer (12) is 1: (1.2-1.5).

8. The high efficiency fiberizing machine set of claim 1, wherein, The feeding system comprises a conical mixer (1) and a pneumatic feeding valve (2), and the material in the conical mixer (1) is added to the constant pressure fiberization kneader through the pneumatic feeding valve (2).

9. The high efficiency fiberizing machine set of claim 1, wherein, Further comprising a control system, the control system comprises: a pressure sensor installed in the inner cavity of the kneader, for detecting the pressure value in the inner cavity of the kneader in real time; a detection device for detecting the current or torque of the driving device of the driving shaft of the kneading wheel; the detection device is an ammeter or a torque sensor; and a controller for collecting the pressure value in the inner cavity of the kneader and the working driving force of the driving shaft of the kneading wheel, and controlling the opening and closing of the pneumatic feeding valve (2) and the electric sliding plate valve (5), and the lifting of the piston type constant pressure top cover (4).

10. A method of material fiberization based on the high-efficiency fiberization unit according to any one of claims 1 to 9, characterized in that, The process comprises kneading fiberization and scraper screen treatment; the steps of the kneading fiberization are as follows: Before starting the kneading fiberization process, first ensure that the electric sliding plate valve (5) is in the closed state, then the controller keeps the constant pressure of the kneader cavity by controlling the lifting of the piston constant pressure cover (4), then the controller controls the material in the conical mixer (1) to the constant pressure fiberization kneader through the pneumatic feed valve (2), and starts the kneading wheel to start the kneading fiberization process; The material contains main powder and fiberizable polytetrafluoroethylene (PTFE) powder, wherein the main powder is selected from at least one of the battery positive / negative electrode material mixture, polyphenylene sulfide powder or solid electrolyte powder; During the kneading fiberization process, the detection device detects the driving current or torque of the kneading wheel driving device in real time and sends it to the controller; The controller opens the electric sliding plate valve (5) according to the working driving force of the kneading wheel driving shaft, pours the powder in the kneader cavity into the conical screen (10) below, then closes the electric sliding plate valve (5), and the kneading fiberization process is completed. The steps of the scraping screen process are as follows: After the electric sliding plate valve (5) is opened, the controller starts the speed reducer motor (12) to drive the triangular scraper (11) to rotate along the inner wall of the conical screen (10), and at the same time the controller opens the gas source to spray high pressure gas through the gas guide pipe. When the powder falling into the conical screen (10) is completely crushed and screened and falls into the bottom of the closed powder collecting barrel (8), the controller closes the speed reducer motor (12) and the gas source, and the scraping screen process is completed.

11. The method of material fiberization according to claim 10, wherein, The adjustment range of the pressure in the kneader cavity is 0.1~3MPa, the rotating speed of the triangular scraper (11) is 2000rmp~3000rmp, and the pressure of the high pressure gas is 0.05~0.3MPa.

Images