A combined shearing device for battery-grade lithium particles

Abstract

The present invention discloses a battery-grade lithium particle combined shearing device, including a grain removal device, a dry air purge device and a rotary cutter. The rotary cutter is arranged in front of the lithium outlet of the lithium bar and is spaced apart from the lithium outlet of the lithium bar. The rotary cutter includes two blades located in a straight line, the cutting edges of the two blades face oppositely, and the ends of the two blades are fixedly connected to the rotating shaft of a rotary drive device. The grain removal device is respectively arranged on the front blade surfaces of the two blades. The grain removal device and the lithium particles are elastically offset in a releasable manner. The dry air purge device is arranged above the front side of the lithium outlet of the lithium bar, and the air outlet of the dry air purge device is obliquely opposite to the lithium outlet of the lithium bar from top to bottom and from front to back. The battery-grade lithium particle combined shearing device of the present invention has high production efficiency, can ensure the uniformity and regularity of the morphology of the lithium particles, and avoids the problem of knife sticking and the problem of oxidation and nitridation of the metal lithium caused by the heating of the extrusion die due to long-term operation.

Description

Technical Field

[0001] The invention relates to a lithium particle shearing device, in particular to a battery-level lithium particle combined shearing device. Background Art

[0002] Lithium metal is an ideal catalyst for organic synthesis reactions, with high catalytic efficiency and few by-products. Lithium metal particles are widely used in the pharmaceutical and petrochemical industries, as well as catalysts for the synthesis of anti-tumor drugs, anti-AIDS drugs, and drugs for the treatment of hypertension and hyperlipidemia. In particular, high-purity battery-grade lithium metal particles have the advantages of high purity, low impurity content, and high catalytic yield.

[0003] At present, the common shearing methods of lithium metal in the market are manual shearing and a small amount of automatic shearing. The existing manual shearing method has low efficiency, heavy workload for workers, and uneven lengths of products produced. A small number of single-function automatic shearing devices can easily cause particle deformation during the shearing process due to the softness of lithium metal, the high viscosity of lithium metal and the stickiness of the knife, and the long-term heating of the extrusion die, which can cause oxidation and nitridation of lithium metal particles. Summary of the invention

[0004] The present invention is completed to solve the deficiencies in the prior art. The purpose of the present invention is to provide a battery-grade lithium particle combined shearing device with high production efficiency, which greatly reduces the workload of workers, ensures the particle uniformity and regularity of particle morphology of the produced products, avoids the problem of knife sticking caused by the high viscosity of metal lithium particles and the problem of metal lithium oxidation and nitridation caused by long-term heating of the extrusion die.

[0005] A battery-grade lithium particle combined shearing device of the present invention comprises a grain-removing device, a dry air purging device and a rotary cutter arranged longitudinally and rotatable on a vertical plane, a front side surface of an extrusion die is provided with a lithium bar outlet arranged transversely, the rotary cutter is arranged just in front of the lithium bar outlet and is spaced apart from the lithium bar outlet, the rotary cutter comprises two blades located in a straight line, the cutting edges of the two blades face oppositely, the ends of the two blades are fixedly connected to the rotating shaft of a rotary driving device, the grain-removing device is respectively arranged on the front side blade surfaces of the two blades, the grain-removing device and the lithium particles are releasably elastically offset, the dry air purging device is arranged above the front side of the lithium bar outlet, and the air outlet of the dry air purging device is obliquely opposite to the lithium bar outlet from top to bottom and from front to back.

[0006] A battery-grade lithium particle combined shearing device of the present invention may also be:

[0007] The grain discharging device includes a grain discharging baffle and at least one elastic member. Both the grain discharging baffle and the elastic member are arranged on the front side cutting surface of the blade. The grain discharging baffle extends along the edge extension direction of the blade. One end of the elastic member is fixed on the front side cutting surface of the blade, and the other end of the elastic member is fixedly connected to the inner side surface of the grain discharging baffle. There is a gap between the outer side surface of the grain discharging baffle and the edge of the blade, and the outer side surface of the grain discharging baffle is in releasable elastic contact with the lithium particles.

[0008] The elastic member is a grain discharging spring. The grain discharging springs are arranged at intervals along the edge extension direction of the blade. One end of the grain discharging spring is fixedly connected to the front side cutting surface of the blade, and the other end of the grain discharging spring is fixedly connected to the inner side surface of the grain discharging baffle.

[0009] A limiting groove for accommodating the grain discharging spring is provided on the front side cutting surface of each blade. The grain discharging spring is limited and fixed in the limiting groove. One end of the grain discharging spring is fixedly connected to the bottom of the limiting groove. An inwardly extending grain discharging connecting piece is provided on the inner side surface of the grain discharging baffle. The outer end of the grain discharging connecting piece is fixedly connected to the inner side surface of the grain discharging baffle, and the inner end of the grain discharging connecting piece is fixedly connected to the other end of the grain discharging spring. The inner end of the grain discharging connecting piece is movably arranged in the limiting groove in the inner and outer direction.

[0010] The distance of the gap between the outer side surface of the grain discharging baffle and the corresponding edge of the blade is 2 mm - 3 mm.

[0011] The distance of the gap between the rotary cutter and the lithium strip lithium outlet is 0.2 mm - 0.5 mm.

[0012] The length of the rotary cutter is greater than the arrangement length of the lithium strip lithium outlets.

[0013] The air outlet of the dry air purging device is arranged in parallel with the lithium strip lithium outlet.

[0014] The acute angle of the included angle between the orientation of the air outlet of the dry air purging device and the orientation of the lithium strip lithium outlet is 30° - 45°.

[0015] The distance between the air outlet of the dry air purging device and the lithium strip lithium outlet is 40 mm - 60 mm.

[0016] A battery-grade lithium particle combined shearing device of the present invention comprises a grain-removing device, a dry air purging device and a rotary cutter arranged longitudinally and rotatable on a vertical plane, a front side surface of an extrusion die is provided with a lithium bar outlet arranged transversely, the rotary cutter is arranged just in front of the lithium bar outlet and is spaced apart from the lithium bar outlet, the rotary cutter comprises two blades located in a straight line, the cutting edges of the two blades face oppositely, the ends of the two blades are fixedly connected to the rotating shaft of a rotary driving device, the grain-removing device is respectively arranged on the front side blade surfaces of the two blades, the grain-removing device and the lithium particles are releasably elastically offset, the dry air purging device is arranged above the front side of the lithium bar outlet, and the air outlet of the dry air purging device is obliquely opposite to the lithium bar outlet from top to bottom and from front to back. In this way, a comprehensive metal lithium particle shearing device capable of automatic shearing, automatic particle removal and dry air blowing and cooling is provided. The rotary cutter is composed of two blades installed on a rotating shaft in a centrally symmetrical manner. Compared with the traditional shearing method, the rotary automatic shearing can effectively improve the production efficiency and reduce the labor intensity of workers. The product shape will be more regular and uniform. At the same time, the double-blade combined rotary cutter replaces the slapping shearing method in the existing automatic shearing, which solves the problem that the original slapping shearing is prone to causing particle deformation, and makes the appearance of the metal lithium particles more regular. When the sheared lithium metal particles are under the action of the rotation of the blade, the lithium bars extruded from the lithium bar outlet of the extrusion die are cut laterally from the side by the rotating cutter. The rotating cutter will exert a thrust on the sheared lithium metal particles during the high-speed rotation process, and then the lithium metal particles will form a pressure on the particle removal device on the front blade surface of the rotating cutter. The particle removal device is deformed by the external pressure and accumulates elastic potential energy. After the accumulated elastic potential energy reaches the maximum, the lithium metal particles adhered to the blade are ejected, thereby achieving the effect of automatic particle removal and avoiding the problem of knife sticking during the shearing process due to the high viscosity of lithium metal. The dry air purge device is located above the lithium outlet of the lithium bar. During the entire shearing process and the extrusion process, the air outlet of the dry air purge device continuously purges the rotary cutter and the lithium outlet of the lithium bar with dry cold air or cold argon gas, which effectively prevents the lithium outlet of the lithium bar and the rotary cutter at the extrusion die from heating up due to long-term work. At the same time, the high-speed dry cold argon purge can also reduce the oxygen and nitrogen content of the atmosphere near the working area during the extrusion and shearing processes, and ultimately avoid the oxidation and nitridation of metallic lithium. Compared with the prior art, the battery-grade lithium particle combined shearing device of the present invention has the following advantages: high production efficiency, greatly reducing the workload of workers, ensuring the particle uniformity and regular particle morphology of the produced products, and avoiding the problem of knife sticking due to the high viscosity of metallic lithium particles and the problem of oxidation and nitridation of metallic lithium due to the heating of the extrusion die due to long-term work. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the front view of a combined shearing device for battery-grade lithium particles according to the present invention.

[0018] Figure 2 This is the left view of a combined shearing device for battery-grade lithium particles according to the present invention.

[0019] Figure 3 This is a schematic diagram of the rotary cutter of a combined shearing device for battery-grade lithium particles according to the present invention.

[0020] Figure 4 This is a combined shearing device for battery-grade lithium particles according to the present invention Figure 3 The partial enlarged view of area A in

[0021] Explanation of drawing numbers

[0022] 1... Rotary cutter 2... Grain discharging device 3... Dry air purging device

[0023] 4... Rotating shaft 5... Extrusion die 6... Lithium strip outlet

[0024] 7... Grain discharging spring 8... Grain discharging baffle 9... Limit groove

[0025] 10... Grain discharging connecting piece Detailed implementation manners

[0026] When directions (up, down, front, back, inside and outside) are described in the present invention, the structure shown in Figure 1 is taken as a reference for description, but the actual use direction of the present invention is not limited thereto. Among them, the rotary cutter 1 is in the front, and the extrusion die 5 is in the back; the dry air purging device 3 is on the top, and the lithium strip outlet 6 is at the bottom; the cutting edge of each blade of the rotary cutter 1 is on the outside, and the grain discharging device 2 is on the inside.

[0027] Next, in combination with Figures 1 to 4 a further detailed description will be given to a combined shearing device for battery-grade lithium particles of the present invention.

[0028] For a combined shearing device for battery-grade lithium particles of the present invention, please refer to Figures 1 to 4, including a grain-removing device 2, a dry air purging device 3 and a rotary cutter 1 which is longitudinally arranged and rotatable on a vertical plane. A lithium bar outlet 6 arranged laterally is provided on the front side of the extrusion die 5. The rotary cutter 1 is arranged directly in front of the lithium bar outlet 6 and is spaced apart from the lithium bar outlet 6. The rotary cutter 1 includes two blades located in a straight line, the edges of the two blades face oppositely, and the ends of the two blades are fixedly connected to the rotating shaft 4 of the rotary drive device. The grain-removing device 2 is respectively arranged on the front side blade surfaces of the two blades, and the grain-removing device 2 is elastically offset against the lithium particles in a releasable manner. The dry air purging device 3 is arranged above the front side of the lithium bar outlet 6, and the air outlet of the dry air purging device 3 is obliquely opposite to the lithium bar outlet 6 from top to bottom and from front to back. In this way, a comprehensive metal lithium particle shearing device capable of automatic shearing, automatic grain removal and dry air blowing and cooling is provided. The rotary cutter 1 is composed of two blades installed on the rotating shaft 4 in a centrally symmetrical manner. Compared with the traditional shearing method, the rotary automatic shearing can effectively improve the production efficiency and reduce the labor intensity of the workers. The product shape will be more regular and uniform. At the same time, the double-blade combined rotary cutter 1 replaces the slapping shearing method in the existing automatic shearing, which solves the problem that the original slapping shearing is prone to causing particle deformation, and makes the appearance of the metal lithium particles more regular. When the sheared lithium metal particles are under the action of the rotation of the blade, the lithium bars extruded from the lithium bar outlet 6 of the extrusion die 5 are cut laterally from the side by the rotary cutter 1. The rotary cutter 1 will exert a thrust on the sheared lithium metal particles during the high-speed rotation process, and then the lithium metal particles will form a pressure on the particle removal device 2 on the front blade surface of the rotary cutter 1. The particle removal device 2 is deformed by the external pressure and accumulates elastic potential energy. After the accumulated elastic potential energy reaches the maximum, the lithium metal particles adhered to the blade are ejected, thereby achieving the effect of automatic particle removal and avoiding the problem of the knife sticking during the shearing process due to the high viscosity of lithium metal. The dry air purge device 3 is located above the lithium bar outlet 6. During the entire shearing process and extrusion process, the air outlet of the dry air purge device 3 continuously purges the rotary cutter 1 and the lithium bar outlet 6 with dry cold air or cold argon gas, which effectively prevents the lithium bar outlet 6 and the rotary cutter 1 at the extrusion die 5 from heating up due to long-term work. At the same time, the high-speed dry cold argon gas purge can also reduce the oxygen and nitrogen content of the atmosphere near the working area during the extrusion and shearing processes, and ultimately avoid the oxidation and nitridation of metallic lithium. Compared with the prior art, the battery-grade lithium particle combined shearing device of the present invention has the following advantages: high production efficiency, greatly reducing the workload of workers, ensuring the particle uniformity and regular particle morphology of the produced products, and avoiding the problem of knife sticking caused by the high viscosity of metallic lithium particles and the problem of oxidation and nitridation of metallic lithium caused by the long-term heating of the extrusion die 5.

[0029] A combined shearing device for battery-grade lithium particles according to the present invention, on the basis of the technical solutions described above, please refer to Figures 1 to 4, it can also be: the grain-removing device 2 includes a grain-removing baffle 8 and at least one elastic member, the grain-removing baffle 8 and the elastic member are both arranged on the front side blade surface of the blade, the grain-removing baffle 8 is extended along the extending direction of the blade edge, one end of the elastic member is fixed on the front side blade surface of the blade, the other end of the elastic member is fixedly connected to the inner side of the grain-removing baffle 8, there is a gap between the outer side of the grain-removing baffle 8 and the blade edge, and the outer side of the grain-removing baffle 8 and the lithium particles are elastically offset in a releasable manner. In this way, the rotary cutter 1 will have a thrust on the sheared metal lithium particles during the high-speed rotation process, and then the metal lithium particles will form a pressure on the grain-removing baffle 8 located on the rotary cutter 1, and the pressure formed is transmitted to the elastic member, the elastic member is deformed by the external pressure and accumulates elastic potential energy, and when the deformation reaches the maximum elastic deformation of the elastic member, the elastic member converts the elastic potential energy into kinetic energy to eject the metal lithium particles adhering to the blade, and the structure is simple and effective. On the basis of the technical solution described above, it is further preferred that the elastic member is a grain-rejecting spring 7, which is arranged at intervals along the extending direction of the cutting edge of the blade, one end of the grain-rejecting spring 7 is fixedly connected to the front blade surface of the blade, and the other end of the grain-rejecting spring 7 is fixedly connected to the inner side surface of the grain-rejecting baffle 8. In this way, because the spring is a commonly used elastic member, 2 to 4 grain-rejecting springs 7 can be set. When the number of grain-rejecting springs 7 is less than 2, the grain-rejecting device 2 of this structure lacks stability. When the number of grain-rejecting springs 7 is greater than 4, it is difficult to cause deformation to the grain-rejecting spring 7 due to excessive elastic potential energy, thereby affecting the grain-rejecting effect. On the basis of the technical solution described above, it is further preferred that a limiting groove 9 for accommodating the grain-removing spring 7 is provided on the front blade surface of each blade, the grain-removing spring 7 is fixedly arranged in the limiting groove 9, one end of the grain-removing spring 7 is fixedly connected to the bottom of the limiting groove 9, and a grain-removing connecting piece 10 extending inward is provided on the inner side surface of the grain-removing blocking piece 8, the outer end of the grain-removing connecting piece 10 is fixedly connected to the inner side surface of the grain-removing blocking piece 8, the inner end of the grain-removing connecting piece 10 is fixedly connected to the other end of the grain-removing spring 7, and the inner end of the grain-removing connecting piece 10 can be movably arranged in the limiting groove 9 along the inner and outer directions. In this way, by setting the limiting groove 9 and the limiting connecting piece, the grain-removing spring 7 and the grain-removing blocking piece 8 cannot be displaced in the horizontal direction (the extension direction of the blade edge), and will not fall off from the device, thereby enhancing the integrity and stability of the entire device, thereby also prompting the grain-removing spring 7 to only deform and accumulate elastic potential energy in the longitudinal direction, thereby finally realizing automatic grain removal. Specifically, a limiting groove 9 is welded on the surface of the blade, because the thickness of the blade of the rotary cutter 1 is not enough to support the inner groove embedded spring. Based on the technical solution described above, it is further preferred that the distance between the outer side surface of the grain removal baffle 8 and the corresponding cutting edge of the blade is 2mm-3mm.In this way, when this distance is greater than 3 mm, due to the large viscosity of metallic lithium, particles may adhere to the cutting edge of the rotary cutter 1 and fail to touch the grain discharging baffle 8 of the grain discharging device 2, unable to cause elastic deformation of the elastic member (grain discharging spring 7), and thus automatic grain discharging cannot be achieved. When this distance is less than 2 mm, the cutting edge may be too narrow, affecting the shearing effect, and the premature extrusion of the particles by the grain discharging baffle 8 may cause irregular particle morphology.

[0030] For a combined shearing device for battery-grade lithium particles according to the present invention, based on the technical solutions described above, please refer to Figures 1 to 4 , it may also be that: the distance between the rotary cutter 1 and the lithium strip discharging port 6 is 0.2 mm - 0.5 mm. In this way, when this distance is greater than 0.5 mm, it is easy to cause the metallic lithium strip to bend and deform under the action of the blade when the rotary cutter 1 shears, thus causing the lithium particles to deform. When it is less than 0.2 mm, there is a safety hazard of the rotary blade hitting the extrusion die 5.

[0031] For a combined shearing device for battery-grade lithium particles according to the present invention, based on the technical solutions described above, please refer to Figures 1 to 4 , it may also be that: the length of the rotary cutter 1 is greater than the arrangement length of the lithium strip discharging ports 6. In this way, the rotary cutter 1 can accurately and effectively cut the lithium strip. Specifically, the width of the blade of the rotary cutter 1 is 20 mm, and its blade length is generally 2 mm longer than the arrangement length of the lithium strip discharging ports 6 of the extrusion die 5.

[0032] For a combined shearing device for battery-grade lithium particles according to the present invention, based on the technical solutions described above, please refer to Figures 1 to 4, it can also be that the air outlet of the dry air blowing device 3 is arranged in parallel with the lithium strip outlet 6. In this way, the parallel arrangement of the dry air blowing device 3 and the lithium strip outlet 6 can evenly blow to the lithium strip outlet 6. On the basis of the technical solutions described above, further preferably, the acute angle between the orientation of the air outlet of the dry air blowing device 3 and the orientation of the lithium strip outlet 6 is 30°-45°. In this way, the angled blowing of the dry air blowing device 3 and the parallel arrangement with the lithium strip outlet 6 can blow to the lithium outlet of the extrusion die 5 to the greatest extent, and at the same time, it can also achieve degranulation by means of the action of wind to the greatest extent, avoiding the oxidation and nitridation of lithium metal particles caused by the long-term working heat of the extrusion die 5. On the basis of the technical solutions described above, further preferably, the distance between the air outlet of the dry air blowing device 3 and the lithium strip outlet 6 is 40mm-60mm. In this way, if this distance is greater than 60mm, the wind speed and wind force will be reduced, which is not conducive to the degranulation of some particles with strong viscosity, and at the same time, it will also affect the cooling effect of the extrusion die 5 and the rotary cutter 1. If it is less than 40mm, the lithium metal particles ejected by the degranulation device 2 will hit the air outlet, resulting in the deformation of the lithium metal particles and the ejection of the lithium metal particles into the air outlet, blocking the air outlet.

[0033] The above only illustrates the specific embodiments of the present invention, but it cannot be used as the protection scope of the present invention. Any equivalent changes or modifications made according to the design spirit of the present invention should be considered to fall within the protection scope of the present invention.

Claims

1. A battery-grade lithium particle combined shearing device, Features: It comprises a grain-removing device, a dry air purge device and a rotary cutter arranged longitudinally and rotatable on a vertical plane. A lithium bar outlet arranged transversely is provided on the front side of the extrusion die. The rotary cutter is arranged in front of the lithium bar outlet and is spaced apart from the lithium bar outlet. The rotary cutter comprises two blades located in a straight line. The cutting edges of the two blades face oppositely. The ends of the two blades are fixedly connected to the rotating shaft of a rotary drive device. The grain-removing device is respectively arranged on the front blade surfaces of the two blades. The grain-removing device and the lithium particles are elastically offset in a releasable manner. The dry air purge device is arranged above the front side of the lithium bar outlet. The air outlet of the dry air purge device is obliquely opposite to the lithium bar outlet from top to bottom and from front to back. The grain-removing device comprises a grain-removing baffle and at least one elastic member, both of which are arranged on the front blade surface of the blade, the grain-removing baffle is extended along the extending direction of the cutting edge of the blade, one end of the elastic member is fixed on the front blade surface of the blade, the other end of the elastic member is fixedly connected to the inner side surface of the grain-removing baffle, there is a gap between the outer side surface of the grain-removing baffle and the cutting edge of the blade, and the outer side surface of the grain-removing baffle is releasably elastically abutted against the lithium particles; The elastic member is a grain-rejecting spring, which is arranged at intervals along the extending direction of the cutting edge of the blade, one end of the grain-rejecting spring is fixedly connected to the front blade surface of the blade, and the other end of the grain-rejecting spring is fixedly connected to the inner side surface of the grain-rejecting baffle; A limiting groove for accommodating the grain-returning spring is provided on the front blade surface of each blade, the grain-returning spring is fixedly limited in the limiting groove, one end of the grain-returning spring is fixedly connected to the bottom of the limiting groove, an inner side surface of the grain-returning blocking piece is provided with a grain-returning connecting piece extending inwardly, the outer end of the grain-returning connecting piece is fixedly connected to the inner side surface of the grain-returning blocking piece, the inner end of the grain-returning connecting piece is fixedly connected to the other end of the grain-returning spring, and the inner end of the grain-returning connecting piece can be movably arranged in the limiting groove along the inward and outward directions.

2. A battery-grade lithium particle combined shearing device according to claim 1, Features: The distance between the outer side surface of the grain-removing baffle and the corresponding cutting edge of the blade is 2 mm-3 mm.

3. A battery-grade lithium particle combined shearing device according to any one of claims 1 to 2, Features: The distance between the rotary cutter and the lithium outlet of the lithium bar is 0.2mm-0.5mm.

4. A battery-grade lithium particle combined shearing device according to any one of claims 1 to 2, Features: The length of the rotary cutter is greater than the arrangement length of the lithium outlets of the lithium bars.

5. A battery-grade lithium particle combined shearing device according to any one of claims 1 to 2, Features: The air outlet of the dry air purge device is arranged in parallel with the lithium outlet of the lithium bar.

6. A combined shearing device for battery-grade lithium particles according to claim 5, characterized in that: the acute angle between the orientation of the air outlet of the dry air purging device and the orientation of the lithium strip outlet is 30°-45°.

7. A combined shearing device for battery-grade lithium particles according to claim 5, characterized in that: the distance between the air outlet of the dry air purging device and the lithium strip outlet is 40mm-60mm.

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