Crushing device for tantalum powder for capacitor

Abstract

The invention discloses a crushing device for tantalum powder for a capacitor, and relates to the technical field of tantalum material crushing, the crushing device for the tantalum powder for the capacitor comprises a device body, a screen assembly and a crushing mechanism, the device body is internally provided with a containing cavity, and the screen assembly is arranged in the containing cavity. The crushing mechanism is arranged on the device body and extends into the screen assembly so as to rotationally crush the tantalum materials in the screen assembly. According to the crushing device for the tantalum powder for the capacitor disclosed by the invention, force is applied to the single side of tantalum material particles under the rotating action of the crushing mechanism to impact the tantalum material particles so as to crush the tantalum material, the influence on internal pore channels of the particles is reduced as much as possible, and the fine powder proportion is reduced, so that the quality of the tantalum powder is ensured, and the electrical performance of the tantalum powder is further ensured.

Description

Technical Field

[0001] This invention belongs to the field of tantalum material crushing technology, specifically a crushing device for tantalum powder used in capacitors. Background Technology

[0002] Tantalum capacitors are widely used in electrical, communication, automotive, military, and aerospace fields due to their miniaturization, high capacitance, high efficiency, high stability, high reliability, and long lifespan. The anode of a tantalum capacitor is a porous sintered tantalum powder body, and the working medium is an extremely thin tantalum pentoxide film (20nm~400nm) formed on the surface of the sintered tantalum powder. Because of the fine particle size and large specific surface area of ​​tantalum powder, and the extremely thin oxide film formed on the tantalum metal surface, tantalum capacitors can achieve large capacitance despite their small size. Tantalum capacitors come in various shapes and are easily manufactured into various small and surface-mount components to meet the needs of current electronic technology automation and miniaturization development.

[0003] Currently, the main methods for preparing tantalum powder for tantalum capacitors are the potassium sodium fluorotantalate reduction method and the tantalum ingot hydrogenation ball milling method. The resulting raw powder undergoes acid washing to remove impurities, granulation, multiple heat treatments, and deoxidation treatments to finally obtain porous, large-particle tantalum powder. This tantalum powder possesses certain strength and flowability while retaining a large specific surface area. After heat treatment, the tantalum powder adheres to each other into blocks, forming metallic bonds between particles, requiring crushing and sieving. In existing technologies, hammer crushers and jaw crushers are generally used for crushing.

[0004] However, hammer crushers and jaw crushers use impact and compression to break down tantalum powder particles. Individual tantalum particles are subjected to forces in two opposing directions. The porous structure inside the particles becomes denser due to compression or impact, making it difficult to wet the cathode or significantly reducing the wetting effect when sintering into tantalum anode blocks. This results in some capacity not being extracted, causing capacity loss. Furthermore, the irregular cross-section of the particle surface and the uneven formation of the oxide film on some sharp ends during anode charging lead to tip discharge, increasing the leakage current of the tantalum capacitor and causing failure. This problem urgently needs to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a crushing device for tantalum powder for capacitors, so as to at least mitigate the impact on the internal pores of the particles.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a device for crushing tantalum powder for capacitors, comprising: The device body has a receiving cavity inside; A screen assembly disposed within a receiving cavity; The crushing mechanism is located on the main body of the device and extends into the screen assembly to rotate and crush the tantalum material inside the screen assembly.

[0007] As a further embodiment of the present invention, the crushing mechanism includes a rotating shaft, a first cutter body, and a driving component, wherein the rotating shaft is arranged vertically within the screen assembly; At least one first cutter body is connected to a rotating shaft and extends radially, and a drive member is connected to the rotating shaft for transmission.

[0008] As a further embodiment of the present invention, the crushing mechanism further includes at least one second blade body, which is connected to the rotating shaft and extends in a direction that forms a predetermined angle with the radial direction of the rotating shaft.

[0009] As a further embodiment of the present invention, the first blade body has a first cutting edge and a plurality of first buffer grooves, the first buffer grooves being arranged at intervals along the extension direction of the first cutting edge and being interconnected. And / or, the second blade has a second cutting edge and a plurality of second buffer grooves, the second buffer grooves being arranged at intervals along the extension direction of the second cutting edge and being interconnected.

[0010] As a further embodiment of the present invention, the extending direction of the first buffer groove and the extending direction of the first blade form a first acute angle, the first acute angle being 5°~20°. And / or, the extension direction of the second buffer groove and the extension direction of the second blade form a second acute angle, the second acute angle being 5°~20°.

[0011] As a further embodiment of the present invention, at least the uppermost first cutting edge has a downward-facing bevel, and at least the lowermost first cutting edge has an upward-facing bevel. And / or, at least the uppermost second blade has a downward-facing bevel, and at least the lowermost second blade has an upward-facing bevel.

[0012] As a further embodiment of the present invention, the screen assembly includes a screen and a base plate, with the screen arranged around a rotating shaft; The top of the screen abuts against the top wall of the receiving cavity, and the bottom of the screen abuts against the base plate, which is fixed to the main body of the device.

[0013] As a further embodiment of the present invention, the first blade, the second blade, and the screen are all made of tantalum.

[0014] As a further embodiment of the present invention, the device body is also provided with a feed inlet, a protective gas inlet, and an exhaust outlet.

[0015] As a further embodiment of the present invention, the device body includes a cylinder and a cover covering the cylinder, the receiving cavity is located inside the cylinder, and the screen assembly and the crushing mechanism are connected to the cover.

[0016] According to the present invention, a crushing device for tantalum powder for capacitors is provided, which has at least the following technical effects. The crushing device for tantalum powder for capacitors includes a device body, a screen assembly, and a crushing mechanism. The device body has a receiving cavity, the screen assembly is disposed in the receiving cavity, and the crushing mechanism is disposed on the device body and extends into the screen assembly to rotate and crush the tantalum material in the screen assembly. The tantalum powder crushed to a certain particle size falls from the screen assembly to the bottom of the receiving cavity.

[0017] Therefore, the crushing device for tantalum powder for capacitors provided by the present invention applies a force to one side of the tantalum particles under the rotation of the crushing mechanism to crush the tantalum material, thereby minimizing the impact on the internal channels of the particles and reducing the proportion of fine powder, thus ensuring the quality of the tantalum powder and its electrical performance. Attached Figure Description

[0018] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 A schematic diagram of the structure of the tantalum powder crushing device for capacitors provided in an embodiment of the present invention; Figure 2 for Figure 1 A partial structural diagram along direction A in the middle; Figure 3 for Figure 1 A partial structural diagram along direction B in the middle; Figure 4 SEM image of tantalum powder obtained by existing hammer crushing method; Figure 5 This is a SEM image of the tantalum powder obtained by the blade-breaking method of the present invention.

[0020] Figure label: 100. Device body; 101. Receiving cavity; 102. Feed inlet; 103. Protective gas inlet; 104. Exhaust port; 110. Cylinder; 120. Cover; 200. Screen assembly; 210. Screen; 220. Base plate; 300, Crushing mechanism; 310, Rotating shaft; 320, First cutter body; 321, First cutting edge; 322, First buffer groove; 330, Driving component; 340, Second cutter body; 341, Second cutting edge; 342, Second buffer groove. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and 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. Therefore, they should not be construed as limiting this invention.

[0023] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0024] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0027] Please see Figures 1 to 3 As shown, an embodiment of the present invention provides a crushing device for tantalum powder used in capacitors, comprising: The device body 100 has a receiving cavity 101 inside.

[0028] The screen assembly 200 is disposed in the receiving cavity 101.

[0029] The crushing mechanism 300 is disposed on the device body 100 and extends into the screen assembly 200 to rotate and crush the tantalum material inside the screen assembly 200.

[0030] In this embodiment, the device body 100 can be a barrel, shell or other structure, and the cavity 101 inside is used to accommodate the screen assembly 200, part of the crushing mechanism 300 and tantalum material.

[0031] The screen assembly 200 in this embodiment is used to screen the crushed tantalum material. It can be in the shape of a rotating body. The side wall or bottom of the screen assembly 200 has screen holes with a mesh size of about 40 mesh.

[0032] In this embodiment, the crushing mechanism 300 is mounted on the device body 100, and the rotating components on it for crushing tantalum materials can be in the form of plates, strips, sheets, etc.

[0033] Specifically, the tantalum material to be crushed is loaded into the screen assembly 200, and then the crushing mechanism 300 is started to rotate at high speed to crush the tantalum material.

[0034] Therefore, compared with the traditional hammer and jaw crusher operation method of crushing tantalum powder particles by applying force to both sides, the application of the crushing device for capacitor tantalum powder provided in this embodiment of the invention applies force to one side of the tantalum material particles under the rotation of the crushing mechanism 300 to crush the tantalum material, minimizes the impact on the internal channels of the particles, and reduces the proportion of fine powder, thereby ensuring the quality of tantalum powder and thus ensuring its electrical performance.

[0035] In some embodiments, the crushing mechanism 300 includes a rotating shaft 310, a first blade body 320, and a drive member 330, with the rotating shaft 310 arranged vertically within the screen assembly 200.

[0036] At least one first cutter body 320 is connected to the rotating shaft 310 and extends radially, and the drive member 330 is drively connected to the rotating shaft 310.

[0037] Specifically, such as Figure 1 As shown, the upper and lower ends of the rotating shaft 310 can be rotatably mounted on the device body 100 via bearing assemblies to rotate around a vertical axis. The first cutter body 320 can be in the shape of a long plate or strip, etc., with one end fixedly connected to the peripheral wall of the rotating shaft 310 by welding, sleeve, screwing, etc., and the other end extending radially along the rotating shaft 310. The driving component 330 can be a motor, etc., which is mounted on the device body 100 and can be connected to the rotating shaft 310 for transmission via a coupling.

[0038] In this way, when the driving component 330 drives the first cutter body 320 to rotate at high speed via the rotating shaft 310, it can break the tantalum material. The rotation speed can be about 2000 revolutions per minute. In addition, multiple first cutters 320 can be evenly distributed around the rotating shaft 310 or evenly distributed along the vertical direction. The specific number can be determined according to actual needs.

[0039] Furthermore, in this embodiment, the crushing mechanism 300 also includes at least one second blade 340, which is connected to the rotating shaft 310 and extends in a direction that forms a preset angle α with the radial direction of the rotating shaft 310.

[0040] Specifically, such as Figure 1 As shown, the structure of the second cutter body 340 can be the same as that of the first cutter body 320. If the second cutter body 340 and the first cutter body 320 are in the same vertical direction, the angle between the extension direction of the second cutter body 340 and the extension direction of the first cutter body 320 is also α. That is, the second cutter body 340 and the radial direction of the rotating shaft 310 form a preset angle α, which is approximately 5° to 30°.

[0041] In this way, when the second cutter body 340 rotates at high speed, it can form a larger crushing range in the vertical direction, resulting in higher efficiency. In addition, multiple second cutter bodies 340 can be evenly distributed around the rotating shaft 310, or multiple can be evenly distributed in the vertical direction; the specific number can be determined according to actual needs.

[0042] Furthermore, in this embodiment, the first blade body 320 has a first blade 321 and a plurality of first buffer grooves 322, and each first buffer groove 322 is arranged at intervals along the extension direction of the first blade 321 and is interconnected.

[0043] Specifically, such as Figure 1 , Figure 2 As shown, the first cutting edge 321 on the first blade body 320 has a straight side and a beveled side, which facilitates the crushing of finer tantalum particles by cutting. Furthermore, the first blade body 320 has multiple first buffer grooves 322 spaced apart on the side near the first cutting edge 321. These are open grooves, and their openings are connected to the first cutting edge 321. Each first buffer groove 322 is evenly distributed along the extending direction of the first cutting edge 321.

[0044] In this way, the first cutting edge 321 forms multiple independent first cutting teeth with a certain amount of elastic deformation. When it impacts the tantalum particles, it does not make completely rigid contact. Instead, it can play a certain buffering role while breaking the particles, avoiding excessive crushing of the tantalum particles and significantly reducing the proportion of fine powder, thereby ensuring the quality of the tantalum material.

[0045] It should be noted that the first buffer groove 322 can be a straight groove, an arc-shaped groove, etc., but it is designed to provide a better buffering effect. Figure 2As shown, the extension direction of the first buffer groove 322 and the extension direction of the first cutting edge 321 form a first acute angle θ1, which is 5°~20°, that is, to make the first cutting tooth extend radially along the shaft 310 to form a cantilever structure as much as possible. In addition, the normal distance between two adjacent first buffer grooves 322 is approximately 1mm~3mm, which ensures both strength and a certain degree of elastic buffering.

[0046] Similarly, the second blade body 340 has a second blade 341 and a plurality of second buffer grooves 342, and the second buffer grooves 342 are arranged at intervals along the extension direction of the second blade 341 and are interconnected.

[0047] Specifically, such as Figure 1 , Figure 3 As shown, the second cutting edge 341 on the second blade body 340 has a straight side and a beveled side, which facilitates the crushing of finer tantalum particles by cutting. Furthermore, the second blade body 340 has multiple open buffer grooves 342 spaced apart on the side near the second cutting edge 341, with the openings connected to the second cutting edge 341. Each second buffer groove 342 is evenly distributed along the extending direction of the second cutting edge 341.

[0048] In this way, the second blade 341 forms multiple independent second cutting teeth with a certain amount of elastic deformation. When it impacts the tantalum particles, it does not make completely rigid contact. Instead, it can play a certain buffering role while breaking the particles, avoiding excessive crushing of the tantalum particles and significantly reducing the proportion of fine powder, thereby ensuring the quality of the tantalum material.

[0049] It should be noted that the second buffer groove 342 can be a straight groove, an arc-shaped groove, etc., but it is designed to provide a better buffering effect. Figure 3 As shown, the extension direction of the second buffer groove 342 and the extension direction of the second cutting edge 341 form a second acute angle θ2, which is 5°~20°, that is, to make the second cutting tooth extend radially along the shaft 310 to form a cantilever structure as much as possible. In addition, the normal distance between two adjacent second buffer grooves 342 is approximately 1mm~3mm, which ensures both strength and a certain degree of elastic buffering.

[0050] It is worth noting that the blade breaks the metal bonds between the tantalum powder particles. After the tantalum powder is broken, it splashes outward as the blade rotates at high speed. Fine tantalum powder particles pass through the screen holes, effectively avoiding secondary crushing of fine tantalum powder particles. Large tantalum powder particles continue to be crushed until they all pass through the screen holes, thus achieving the effect of crushing and sieving. Whether the blade cuts or impacts the screen, the tantalum powder particles only bear unidirectional force, without compression deformation, and the internal channels of the particles are relatively intact.

[0051] Furthermore, in this embodiment, at least the uppermost first cutting edge 321 has a downward-facing bevel, and at least the lowermost first cutting edge 321 has an upward-facing bevel. This allows the tantalum material to be guided downwards during high-speed rotation, preventing it from rising to the feeding port.

[0052] And / or, at least the uppermost second blade 341 has a downward-facing bevel, and at least the lowermost second blade 341 has an upward-facing bevel. This allows the tantalum material to be guided upwards during high-speed rotation, preventing tantalum deposition. The combined effect ensures that most of the tantalum material is crushed in the middle of the screen assembly 200.

[0053] Furthermore, in this embodiment, the screen assembly 200 includes a screen 210 and a base plate 220, with the screen 210 arranged around the rotating shaft 310.

[0054] The top of the screen 210 abuts against the inner top wall of the receiving cavity 101, and the bottom of the screen 210 abuts against the base plate 220, which is fixed to the device body 100.

[0055] Specifically, such as Figure 1 As shown, the screen 210 is cylindrical and is sleeved on the rotating shaft 310 and the first blade 320 and the second blade 340. The screen 210 abuts against the inner top wall of the device body 100, and the bottom of the screen 210 abuts against the bottom plate 220. The bottom plate 220 can be connected to the top of the device body 100 by multiple hanging rods, screws, etc., or it can be directly connected to the inner side wall of the device body 100.

[0056] In addition, slots for engaging with the screen 210 can be provided on the top wall and bottom plate 220 of the device body 100. The slots are approximately 2mm deep and 2.5mm wide to ensure the stability of the screen 210 and prevent it from shifting during use. The screen is made of tantalum plate with a thickness of approximately 2mm, which is laser-drilled to form a 40-mesh screen, then bent into a cylindrical shape and welded by argon arc welding. It should be noted that no holes are drilled within 1cm of the upper and lower edges of the screen 210 to ensure its strength.

[0057] Furthermore, in this embodiment, the first blade 320, the second blade 340, and the screen 210 are all made of tantalum. Since the tantalum particles mainly collide violently with the first blade 320, the second blade 340, and the screen 210 during the crushing process, these three components are made of tantalum material. The particles knocked down by the tantalum particles are also tantalum, thus avoiding the introduction of other impurities and ensuring purity.

[0058] The first cutter body 320 and the second cutter body 340 require annealing after processing. The annealing temperature is 1000℃±20℃, and the temperature is held for 2 hours to ensure that the strength and toughness are more moderate and the overall performance is better. However, the screen 210 does not need to be annealed to maintain a certain hardness and prevent tantalum particles from deforming due to impact during the crushing process.

[0059] In some embodiments, the device body 100 is further provided with a feed inlet 102, a protective gas inlet 103, and an exhaust outlet 104.

[0060] Specifically, such as Figure 1 As shown, the feed inlet 102 is located above the device body 100, where a hopper can be installed. Inserts can be installed on the material passage below the hopper to adjust the feed rate. Furthermore, as the material temperature rises during the crushing process, to prevent tantalum powder oxidation, the receiving cavity 101 is sealed. A certain pressure of inert gas is introduced through the protective gas inlet 103, and the exhaust port 104 is wrapped with a breathable mesh. The discharge port at the bottom of the device body 100 remains closed, thus maintaining better tantalum material quality.

[0061] In some embodiments, the device body 100 includes a cylinder 110 and a cover 120 covering the cylinder 110, a receiving cavity 101 located inside the cylinder 110, and a screen assembly 200 and a crushing mechanism 300 connected to the cover 120.

[0062] Specifically, such as Figure 1 As shown, the upper end of the cylinder 110 is open, and the cover 120 is detachably connected to the cylinder 110 via screws, snap-fits, or other structures. The cover 120 provides an installation base for the screen assembly 200 and the crushing mechanism 300, facilitating the manufacturing of individual components and subsequent assembly. Additionally, the discharge port can be located at the bottom of the cylinder 110, where an openable and closable valve can also be installed.

[0063] In one specific embodiment, the tantalum powder crushing device for capacitors provided by this invention includes a device body 100, a screen assembly 200, and a crushing mechanism 300. The device body 100 includes a cylinder 110 and a cover 120. The cylinder 110 has a receiving cavity 101. The screen assembly 200 includes a screen 210 and a bottom plate 220. The upper end of the screen 210 abuts against the cover 120, and the lower end of the screen 210 abuts against the bottom plate 220. The bottom plate 220 is connected to the cover 120 by multiple long screws. The crushing mechanism 300 includes a rotating shaft 310, a first blade 320, a driving member 330, and a second blade 340. The rotating shaft 310 is inserted into the screen 210 from the cover 120 and rotatably connected to the bottom plate 220. Bearings and sealing rings are provided at the rotatable connection. Multiple first blades 320 and multiple second blades 340 are connected to the rotating shaft 310. The first blade 320 extends radially, and the second blade 340 extends radially at a predetermined angle α with the rotating shaft 310. The first blade 320 has a first cutting edge 321 and multiple first buffer grooves 322. Each first buffer groove 322 is arranged at intervals along the extension direction of the first cutting edge 321 and is interconnected. The extension direction of the first buffer groove 322 forms an acute angle of 5° to 20° with the extension direction of the first cutting edge 321. The second blade 340 has a second cutting edge 341 and multiple second buffer grooves 342. Each second buffer groove 342 is arranged at intervals along the extension direction of the second cutting edge 341 and is interconnected. The extension direction of the second buffer groove 342 forms an acute angle of 5° to 20° with the extension direction of the second cutting edge 341. The screen 210, the first blade 320 and the second blade 340 are all made of tantalum material. Argon gas is introduced into the receiving cavity 101 during crushing.

[0064] The existing hammer crushing method and the knife crushing method of the present invention were used to test different batches of tantalum material. The specific parameters are shown in Table 1 below: Table 1

[0065] The table above clearly shows that the tantalum powder density using the crushing method of this invention is 0.6 g / cm³ lower than that obtained by hammer crushing. 3 Around 100 μL, the iron content of impurities was significantly reduced, and the leakage current of the product decreased by 1.2 × 10⁻⁶ μL. -4 The capacitance is slightly improved at around µA / µF.V, while the breakdown voltage is significantly improved. Furthermore, as shown below... Figure 4 , Figure 5 As shown, by comparing the morphology of the microstructure of tantalum powder particles, the tantalum powder particles produced by the crushing method of the present invention are more uniform, have a flatter and rounder shape, better flowability, and a smaller proportion of fine powder.

[0066] Therefore, the application of the crushing device for tantalum powder for capacitors provided in this embodiment of the invention applies a force to one side of the tantalum particles under the rotation of the crushing mechanism 300 to crush the tantalum material, thereby minimizing the impact on the internal channels of the particles and reducing the proportion of fine powder, thus ensuring the quality of the tantalum powder and its electrical performance.

[0067] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the structure of the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. A device for crushing tantalum powder for capacitors, characterized in that, include: The device body (100) has a receiving cavity (101) inside. A screen assembly (200) is disposed in the receiving cavity (101); A crushing mechanism (300) is disposed on the device body (100) and extends into the screen assembly (200) to rotatably crush the tantalum material within the screen assembly (200).

2. The crushing device for tantalum powder for capacitors according to claim 1, characterized in that, The crushing mechanism (300) includes a rotating shaft (310), a first cutter body (320), and a driving component (330), wherein the rotating shaft (310) is arranged vertically within the screen assembly (200); At least one of the first blade bodies (320) is connected to the rotating shaft (310) and extends radially, and the drive member (330) is drively connected to the rotating shaft (310).

3. The crushing device for tantalum powder used in capacitors according to claim 2, characterized in that, The crushing mechanism (300) further includes at least one second blade (340), which is connected to the rotating shaft (310) and extends in a direction that forms a preset angle with the radial direction of the rotating shaft (310).

4. The device for crushing tantalum powder for capacitors according to claim 3, characterized in that, The first blade (320) has a first blade (321) and a plurality of first buffer grooves (322), and each of the first buffer grooves (322) is arranged at intervals along the extension direction of the first blade (321) and is interconnected. And / or, the second blade body (340) has a second blade (341) and a plurality of second buffer grooves (342), each of the second buffer grooves (342) being arranged at intervals along the extension direction of the second blade (341) and communicating with each other.

5. The crushing device for tantalum powder for capacitors according to claim 4, characterized in that, The extension direction of the first buffer groove (322) and the extension direction of the first blade (321) form a first acute angle, the first acute angle being 5°~20°; And / or, the extension direction of the second buffer groove (342) forms a second acute angle with the extension direction of the second blade (341), the second acute angle being 5°~20°.

6. The crushing device for tantalum powder for capacitors according to claim 4, characterized in that, At least the uppermost first cutting edge (321) has a downward-facing bevel, and at least the lowermost first cutting edge (321) has an upward-facing bevel; And / or, at least the uppermost second cutting edge (341) has a downward-facing bevel, and at least the lowermost second cutting edge (341) has an upward-facing bevel.

7. The device for crushing tantalum powder for capacitors according to claim 3, characterized in that, The screen assembly (200) includes a screen (210) and a base plate (220), the screen (210) being arranged around the pivot (310); The top of the screen (210) abuts against the inner top wall of the receiving cavity (101), the bottom of the screen (210) abuts against the bottom plate (220), and the bottom plate (220) is fixed to the device body (100).

8. The device for crushing tantalum powder for capacitors according to claim 7, characterized in that, The first blade (320), the second blade (340), and the screen (210) are all made of tantalum.

9. The crushing apparatus for tantalum powder for capacitors according to any one of claims 1 to 8, characterized in that, The device body (100) is also provided with a feed inlet (102), a protective gas inlet (103), and an exhaust outlet (104).

10. The crushing apparatus for tantalum powder for capacitors according to any one of claims 1 to 8, characterized in that, The device body (100) includes a cylinder (110) and a cover (120) covering the cylinder (110). The receiving cavity (101) is located inside the cylinder (110). The screen assembly (200) and the crushing mechanism (300) are connected to the cover (120).

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