A screening mechanism for processing lithium battery graphite negative electrode material and a use method thereof

Abstract

The application discloses a kind of screening mechanism for processing lithium battery graphite negative electrode material and its use method, belong to lithium battery processing technical field, a kind of screening mechanism for processing lithium battery graphite negative electrode material, including the screening box of top being equipped with feed inlet, still include: screening part, including the upper screening plate and lower screening plate being set in screening box, the inside of screening box is with the lower side of upper screening plate is equipped with the guide plate of guiding material to lower screening plate front end, screening box is equipped with first discharge port in lower screening plate terminal, second discharge port is equipped with the side away from first discharge port;Crushing frame, between upper screening plate terminal and lower screening plate front end is set;Driving mechanism;The application is cooperated by making forced conveying, dynamic crushing, coordinated shaking, solves the problem of material accumulation in traditional screening, large particle rework, low efficiency, significantly improves the consistency and production efficiency of lithium battery graphite negative electrode material.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery processing, and particularly relates to a screening mechanism for processing graphite negative electrode material of a lithium battery and a use method thereof. BACKGROUND

[0002] Lithium batteries are a kind of batteries with lithium metal or lithium alloy as positive and negative electrode materials and using non-aqueous electrolyte solution. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high requirements on the environment. With the development of science and technology, lithium batteries have become mainstream. Graphite electrode refers to a kind of high-temperature resistant graphite conductive material made of petroleum coke and pitch coke as aggregate and coal tar pitch as binder through raw material calcination, crushing, powdering, batching, kneading, molding, baking, impregnation, graphitization and mechanical processing, which is called artificial graphite electrode (short for graphite electrode) to distinguish from natural graphite electrode prepared by using natural graphite as raw material.

[0003] At present, the existing graphite powder processing equipment for lithium ion battery negative electrode material crushes and screens the graphite. The particle size consistency of the crushed raw material is poor, and the particles with different particle sizes need to be screened. The existing screening device has a single function and only has the function of screening. The larger graphite particles after screening still need to be collected and fed again. The raw material to be screened is concentrated and discharged, so that the screen plate or screen mesh cannot quickly screen the raw material. The particles accumulated on the lower side of the raw material need to wait until the particles on the lower side of the raw material are screened before being screened. Meanwhile, the large particle raw material after screening will hinder the screening of the subsequent raw material. The overall time of graphite raw material processing is increased, and the graphite processing efficiency cannot be improved. SUMMARY

[0004] The present application aims at solving the problems in the prior art and provides a screening mechanism for processing graphite negative electrode material of a lithium battery and a use method thereof.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] A screening mechanism for processing graphite negative electrode material of a lithium battery, comprising a screening box with a feed inlet at the top, further comprising:

[0007] A screening part, comprising an upper screening plate and a lower screening plate arranged in the screening box, a material guide plate is arranged on the lower side of the upper screening plate in the screening box to guide the material to the front end of the lower screening plate, a first discharge port is arranged at the end of the lower screening plate in the screening box, and a second discharge port is arranged on the side away from the first discharge port;

[0008] A crushing frame is arranged between the end of the upper screening plate and the front end of the lower screening plate.

[0009] The driving mechanism comprises a displacement assembly for driving the crushing frame to move back and forth and a crushing assembly for crushing materials in the crushing frame.

[0010] The upper side of the upper screening plate and the lower side of the lower screening plate are respectively provided with a first conveying assembly and a second conveying assembly, and a transmission part is arranged between the first conveying assembly, the second conveying assembly and the driving mechanism.

[0011] Preferably, the crushing frame comprises:

[0012] The outer frame body is slidingly arranged in the screening box.

[0013] The screening disc is rotationally connected in the outer frame body.

[0014] The displacement assembly is connected to the outer frame body, and the crushing assembly is connected to the screening disc.

[0015] Preferably, the displacement assembly comprises:

[0016] The support is fixedly arranged on the screening box.

[0017] The driving motor is arranged on the support.

[0018] The driving shaft is connected to the output shaft of the driving motor.

[0019] The connecting plate is fixedly connected to the end of the driving shaft.

[0020] The connecting rod is arranged at the end of the connecting plate.

[0021] The connecting ring is sleeved outside the connecting rod.

[0022] The movable rod is movably connected between the connecting ring and the outer frame body.

[0023] Preferably, the crushing assembly comprises:

[0024] The moving plate is slidingly connected at the top of the screening box.

[0025] The screw rod is rotationally arranged in the moving plate.

[0026] The spline sleeve pipe is threadedly connected with the screw rod.

[0027] The crushing plate is fixedly arranged at the bottom of the spline sleeve pipe.

[0028] The first gear is arranged at the top of the screw rod.

[0029] The rack frame is fixedly arranged at the top of the screening box and engaged with the first gear.

[0030] The first gear is engaged with the lower rack of the rack frame.

[0031] Preferably, the crushing assembly further comprises:

[0032] an elastic telescopic rod rotatably connected to the screw rod;

[0033] a second gear provided at the top of the elastic telescopic rod;

[0034] the second gear is engaged with the upper gear rack of the gear rack frame;

[0035] the fixed end of the elastic telescopic rod is rotatably connected to the screw rod through a bearing, and the movable end of the elastic telescopic rod is fixedly connected to the screening disc.

[0036] Preferably, an elastic telescopic positioning rod is slidably connected in the outer frame, and the fixed end of the elastic telescopic positioning rod is connected to the sliding block;

[0037] a sliding groove for the sliding block to slide is formed in the outer frame, and an elastic element is arranged between the inner wall of the sliding groove and the sliding block;

[0038] the two ends of the elastic telescopic positioning rod are respectively provided with a first inclined surface and a second inclined surface;

[0039] a wedge-shaped strip abutting against the first inclined surface is fixedly arranged on the inner wall of the screening box;

[0040] the screening disc is provided with an annular groove matched with the movable end of the elastic telescopic positioning rod.

[0041] Preferably, the first conveying assembly and the second conveying assembly are the same in structure, and each comprises:

[0042] a plurality of conveying shafts rotatably arranged in the screening box at equal intervals;

[0043] a plurality of paddles uniformly distributed on each conveying shaft in a circumferential direction.

[0044] Preferably, the gear transmission mechanism comprises:

[0045] a rotating rod rotatably connected to the screening box, and provided with a driven gear at the end thereof;

[0046] a driving gear rotatably arranged on the driving shaft and engaged with the driven gear;

[0047] the synchronous belt transmission mechanism comprises:

[0048] a plurality of first synchronous wheels arranged on the driving shaft and each conveying shaft of the first conveying assembly, and connected with a first synchronous belt;

[0049] a plurality of second synchronous wheels arranged on the rotating rod and each conveying shaft of the second conveying assembly, and connected with a second synchronous belt.

[0050] Preferably, the application further comprises:

[0051] The first connecting rod is fixed between the outer frame and the lower screening plate;

[0052] The second connecting rod is fixed between the outer frame and the upper screening plate;

[0053] The second connecting rod is an elastic telescopic pipe.

[0054] The application further discloses a use method of the screening mechanism for processing of lithium battery graphite negative electrode materials.

[0055] S1: pouring the graphite particles to be screened into the feeding port at the top of the screening box, starting the driving motor, and rotating the driving shaft to drive the first conveying assembly and the second conveying assembly to work;

[0056] S2: the upper screening plate traps the large-particle graphite and pushes the large-particle graphite to the end of the upper screening plate by the first conveying assembly;

[0057] The lower screening plate classifies: the particles and fine powder meeting the production requirements are driven by the second conveying assembly to move to the first discharging port, and the fine powder passing through the upper screening plate continues to pass through the lower screening plate and is discharged from the second discharging port;

[0058] S3: the displacement assembly drives the crushing frame to reciprocally move left and right;

[0059] When the crushing frame moves, the second gear at the top of the elastic telescopic rod is engaged with the upper rack, the screening disc is rotated relative to the outer frame, and the material falling from the end of the upper screening plate is uniformly dispersed;

[0060] When the screw rod moves with the crushing frame, the first gear is engaged with the lower rack, the spline sleeve tube reciprocally moves up and down along the screw rod in the axial direction, the large-particle material on the screening disc is extruded when the crushing plate moves downward, and the qualified particles and fine powder after crushing fall into the lower screening plate;

[0061] S4: the crushing frame drives the lower screening plate to synchronously reciprocally move through the first connecting rod, so that the material shakes on the lower screening plate and the screening of the material is accelerated;

[0062] The second connecting rod is an elastic telescopic pipe, which drives the upper screening plate to move when the crushing frame is displaced, the second connecting rod is compressed when the upper screening plate abuts against the inner wall of the screening box, the crushing frame continues to be displaced, the screening disc in the outer frame is displaced relative to the end of the upper screening plate, and the material falling from the end of the upper screening plate is uniformly dropped into the screening disc for crushing and grinding work.

[0063] Compared with the prior art, the screening mechanism for processing of lithium battery graphite negative electrode materials and the use method thereof have the following beneficial effects:

[0064] 1. The screening mechanism for processing lithium battery graphite negative electrode material and its use method, which solves the problems of material accumulation, large particle rework and low efficiency in traditional screening by forced conveying, dynamic crushing and coordinated shaking of the particle material, integrates screening, conveying, crushing and grading discharge, and significantly improves the consistency and production efficiency of lithium battery graphite negative electrode material production and processing;

[0065] 2. The screening mechanism for processing lithium battery graphite negative electrode material and its use method, which solves the problem of screening delay of upper layer material particles caused by material accumulation in traditional screening machines by forced feeding of the double conveying assembly + shaking of the screen plate, and effectively improves the material screening efficiency;

[0066] 3. The screening mechanism for processing lithium battery graphite negative electrode material and its use method, which makes the large particle material at the end of the upper screen plate fall dynamically dispersed by combining the screen plate rotation with the crushing frame transverse movement, prevents local accumulation, further improves the material screening efficiency, directly crushes large particle material in the screening process, saves the refeeding link, and improves the production and processing efficiency of lithium battery graphite negative electrode material. BRIEF DESCRIPTION OF DRAWINGS

[0067] Figure 1 is a structural schematic diagram of the present application;

[0068] Figure 2 is a structural schematic diagram of the present application; Figure 1 is an enlarged structural schematic diagram of A part of the present application;

[0069] Figure 3 is a cross-sectional structural schematic diagram of the present application;

[0070] Figure 4 is a structural schematic diagram of the present application; Figure 3 is an enlarged structural schematic diagram of B part of the present application;

[0071] Figure 5 is an enlarged structural schematic diagram of C part of the present application; Figure 3

[0072] is an external structural schematic diagram of the lead screw of the present application; Figure 6

[0073] is a cross-sectional structural schematic diagram of the spline sleeve tube of the present application; Figure 7

[0074] is an external structural schematic diagram of the drive shaft of the present application; Figure 8

[0075] is a structural schematic diagram of the crushing frame of the present application; Figure 9

[0076] Figure 10 ​A schematic view of a partial cross-sectional structure of the outer frame body of the present application.

[0077] Figure 11 A schematic view of a partial cross-sectional structure of the outer frame body of the present application.

[0078] In the figure: 1, screening box; 101, feeding port; 102, first discharging port; 103, second discharging port; 2, upper screening plate; 3, lower screening plate; 4, guide plate; 5, crushing frame; 501, outer frame body; 502, screening disc; 5021, annular groove; 6, support; 601, driving motor; 602, driving shaft; 6021, driving gear; 603, connecting plate; 604, connecting rod; 605, connecting ring; 606, movable rod; 7, moving plate; 701, screw rod; 7011, first gear; 702, spline sleeve tube; 703, crushing plate; 8, rack frame; 801, lower rack; 802, upper rack; 9, elastic telescopic rod; 901, second gear; 10, elastic telescopic positioning rod; 1001, sliding block; 1002, sliding groove; 1003, elastic element; 1004, first inclined surface; 1005, second inclined surface; 11, wedge-shaped strip; 12, conveying shaft; 121, poking piece; 13, rotating rod; 131, driven gear; 14, first synchronous wheel; 15, second synchronous wheel; 16, first connecting rod; 17, second connecting rod. DETAILED DESCRIPTION

[0079] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application.

[0080] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0081] As Figures 1 to 3As shown, the present embodiment proposes a screening mechanism for processing lithium battery graphite negative electrode material, which belongs to the technical field of lithium battery processing and includes a screening box 1 with a feed inlet 101 at the top, and further includes a screening part, a crushing frame 5 and a driving mechanism. The screening part includes an upper screening plate 2 and a lower screening plate 3 arranged in the screening box 1. The size of the screen holes of the upper screening plate 2 is larger than that of the lower screening plate 3, so as to realize particle size grading screening. The upper screening plate 2 intercepts raw materials with particle size greater than the processing requirements of lithium battery graphite. Raw materials meeting the processing requirements and fine powder can pass through the screen holes of the upper screening plate 2. The particle raw materials falling at the front end of the upper screening plate 2 are guided by the guide plate 4 to the front side of the lower screening plate 3, so as to avoid that the fine powder in the falling particles is discharged from the first discharge port 102 with the particle raw materials meeting the processing requirements before being screened by the lower screening plate 3. The upper side of the upper screening plate 2 and the lower screening plate 3 is respectively provided with a first conveying assembly and a second conveying assembly. A transmission part is arranged between the first conveying assembly, the second conveying assembly and the driving mechanism. The transmission part includes a synchronous belt transmission mechanism for driving the first conveying assembly and the second conveying assembly to work simultaneously and a gear transmission mechanism connected with the belt transmission mechanism. The first conveying assembly conveys the large particle materials intercepted on the upper screening plate 2 to the crushing frame 5. The crushing frame 5 realizes horizontal reciprocating motion through a displacement assembly. The built-in crushing assembly of the crushing frame 5 breaks the agglomerated particles during the screening process. The large particles are directly broken in the screening process, so that the return link is omitted. The particles meeting the processing requirements and the fine powder after crushing fall on the lower screening plate 3. The lower screening plate 3 screens the fine powder and the particles meeting the processing requirements. The second conveying assembly conveys the raw materials on the lower screening plate 3. The fine powder is screened by the lower screening plate 3 during the conveying process. The screened fine powder falls at the bottom of the screening box 1. The bottom of the screening box 1 is provided with an inclined surface. The screened fine powder is discharged from the second discharge port 103 along the inclined surface. The integration of screening and crushing functions solves the problem of multiple process treatment of traditional equipment and significantly improves the consistency and production efficiency of lithium battery graphite negative electrode material.

[0082] As shown in Figure 3 , Figure 5 , Figure 9 and Figure 10 , as a preferred embodiment, on the basis of the above-mentioned mode, further, the crushing frame 5 includes an outer frame body 501 and a screening disc 502. The outer frame body 501 can form a sliding pair with the inner wall of the screening box 1 through a linear guide rail or other ways. The displacement assembly drives the outer frame body 501 to realize horizontal reciprocating motion. The screening disc 502 can move up and down and rotate in the outer frame body 501. The crushing assembly crushes the particle materials on the screening disc 502. The crushed materials fall into the lower screening plate 3 through the holes of the screening disc 502.

[0083] As shown in Figure 2 , Figure 3 and Figure 8As shown, as a preferred embodiment, on the basis of the above manner, further, the displacement assembly comprises a support 6 fixed on the screening box 1, a drive motor 601 fixed on the support 6, a drive shaft 602 connected with the output shaft of the drive motor 601, a connecting plate 603 fixedly connected with one end of the drive shaft 602, a connecting rod 604 arranged at the end of the connecting plate 603, a connecting ring 605 sleeved outside the connecting rod 604, and a movable rod 606 movably arranged between the connecting ring 605 and the outer frame body 501; the drive motor 601 drives the eccentrically arranged connecting plate 603 through the drive shaft 602, converts the rotary motion into the circumferential motion of the connecting rod 604, and transmits the motion to the movable rod 606 through the connecting ring 605 to form the linear reciprocating motion of the crushing frame 5, which on the one hand makes the particles quickly screen and fall on the crushing frame 5, and on the other hand makes the material falling from the end of the upper screening plate 2 evenly scattered in the crushing frame 5, avoiding the accumulation of the material in the crushing frame 5, solving the problem of screening delay of the upper layer of material caused by the accumulation of the material in the traditional screening machine, effectively improving the material screening efficiency, and the connecting ring 605 can relatively rotate on the connecting rod 604, and the movable rod 606 is connected with the connecting ring 605 and the outer frame body 501 through ball hinge joints at both ends, allowing a certain angle of deflection.

[0084] As shown in Figure 3 , Figure 6 and Figure 7 , as a preferred embodiment, on the basis of the above manner, further, the crushing assembly comprises a moving plate 7 slidably connected to the top of the screening box 1, a lead screw 701 rotatably connected in the moving plate 7, a spline sleeve tube 702 threadedly connected with the lead screw 701, a crushing plate 703 arranged at the bottom of the spline sleeve tube 702, a first gear 7011 arranged at the top of the lead screw 701, and a rack frame 8 fixedly arranged at the top of the screening box 1 and engaged with the first gear 7011, and the first gear 7011 is engaged with the lower rack 801 of the rack frame 8; when the displacement assembly drives the crushing frame 5 to move left and right reciprocatingly, the first gear 7011 on the lead screw 701 is engaged with the first gear 7011 on the rack frame 8 to drive the spline sleeve tube 702 threadedly connected with the lead screw 701 to move up and down along the lead screw 701, it should be noted that a guide rod for limiting the rotation of the spline sleeve tube 702 should be arranged on the moving plate 7, and the spline sleeve tube 702 drives the crushing plate 703 to crush and mill the material on the screening disc 502 when it moves downward, and the spline sleeve tube 702 drives the crushing plate 703 to move upward synchronously when it moves upward.

[0085] As shown in Figure 3 , Figure 6 and Figure 7As shown, as a preferred embodiment, on the basis of the above manner, further, the crushing assembly further comprises a flexible telescopic rod 9 rotatably connected in the lead screw 701 and a second gear 901 arranged at the top of the flexible telescopic rod 9, the second gear 901 is meshingly connected with the upper rack 802 of the rack frame 8, the fixed end of the flexible telescopic rod 9 is rotatably connected with the lead screw 701 through a bearing, the bearing needs to be a sealing bearing in the prior art to ensure normal work in the graphite powder environment, and the movable end of the flexible telescopic rod 9 is fixedly connected with the screening disc 502; when the lead screw 701 moves with the moving plate 7, the flexible telescopic rod 9 moves synchronously, and when the flexible telescopic rod 9 moves, the second gear 901 at the top of the fixed end of the flexible telescopic rod 9 meshes with the upper rack 802 of the rack frame 8, so that the flexible telescopic rod 9 rotates in the lead screw 701, and the movable end at the bottom of the flexible telescopic rod 9 drives the screening disc 502 to rotate in the outer frame body 501, so that the materials falling from the end of the upper screening plate 2 to the crushing frame 5 are uniformly dispersed; with the crushing plate 703 pressing down the screening disc 502, the screening disc 502 moves downward relative to the outer frame body 501 in rotation, the flexible telescopic rod 9 is stretched to buffer and avoid overload, with the flexible telescopic rod 9 being gradually stretched, the pressure of the materials by the crushing plate 703 gradually increases, and the crushing and grinding of the materials on the screening disc 502 are realized.

[0086] As Figure 9 , Figure 10 and Figure 11As shown, as a preferred embodiment, on the basis of the above mode, further, the outer frame body 501 is slidably connected with the elastic telescopic positioning rod 10, the fixed end of the elastic telescopic positioning rod 10 is connected with the sliding block 1001, the outer frame body 501 is provided with the sliding groove 1002 for sliding of the sliding block 1001, the elastic element 1003 is arranged between the inner wall of the sliding groove 1002 and the sliding block 1001, the elastic element 1003 adopts a spring, the two ends of the elastic telescopic positioning rod 10 are respectively provided with the first inclined surface 1004 and the second inclined surface 1005, the wedge-shaped strip 11 is fixedly arranged on the inner wall of the screening box 1 and is in movable abutment with the first inclined surface 1004, and the annular groove 5021 is arranged on the screening disc 502 and is matched with the movable end of the elastic telescopic positioning rod 10; the crushing frame 5 reciprocatingly moves under the action of the displacement assembly, along with the crushing frame 5 moving to the wedge-shaped strip 11, the first inclined surface 1004 of the elastic telescopic positioning rod 10 abuts against the wedge-shaped strip 11, the elastic telescopic positioning rod 10 moves to the inside of the outer frame body 501, the movable end of the elastic telescopic positioning rod 10 is arranged directly below the edge of the screening disc 502, along with the crushing plate 703 pressing downward on the screening disc 502, the screening disc 502 moves downward in the outer frame body 501 and exerts a pushing force on the second inclined surface 1005, the movable end of the elastic telescopic positioning rod 10 avoids the screening disc 502, after the movable end of the elastic telescopic positioning rod 10 is aligned with the annular groove 5021, the movable end of the elastic telescopic positioning rod 10 is inserted into the annular groove 5021, the screening disc 502 is prevented from moving upward and resetting, then the crushing frame 5 moves back, the crushing plate 703 moves upward and no longer presses downward on the screening disc 502, along with the other end of the elastic telescopic positioning rod 10 no longer being pressed by the wedge-shaped strip 11, the elastic telescopic positioning rod 10 resets under the elastic force of the elastic element 1003, the movable end of the elastic telescopic positioning rod 10 is no longer inserted into the annular groove 5021, the screening disc 502 is instantaneously moved back under the pulling of the elastic telescopic rod 9, the material particles on the screening disc 502 which are compacted due to crushing and grinding are instantaneously dispersed and pass through the screening disc 502, the screening efficiency of the screening disc 502 is ensured, the screening disc 502 is not limited in position, the screening disc 502 is stably lifted along with the crushing plate 703 under the pulling of the elastic telescopic rod 9, and the material on the screening disc 502 is not easy to loosen.

[0087] As Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, as a preferred embodiment, on the basis of the above-mentioned manner, further, the first conveying assembly and the second conveying assembly have the same structure, both comprising: a plurality of conveying shafts 12 equidistantly rotatingly arranged in the screening box 1 and prying pieces 121 circumferentially evenly distributed on each conveying shaft 12; a gear transmission mechanism comprising a rotating rod 13 rotatably connected to the screening box 1, a driven gear 131 arranged on the rotating rod 13, and a driving gear 6021 arranged on the driving shaft 602 and meshing with the driven gear 131; a synchronous belt transmission mechanism comprising a first synchronous wheel 14 arranged on the driving shaft 602 and the plurality of conveying shafts 12 of the first conveying assembly, a first synchronous belt for connecting the plurality of first synchronous wheels 14, a second synchronous wheel 15 arranged on the rotating rod 13 and the plurality of conveying shafts 12 of the second conveying assembly, and a second synchronous belt for connecting the plurality of second synchronous wheels 15;

[0088] When the displacement assembly is working, the driving shaft 602 drives the first conveying assembly to move through the first synchronous wheel 14 and the first synchronous belt, and the active gear 6021 on the driving shaft 602 is meshed with the driven gear 131 on the outside of the rotating rod 13 for transmission, and the rotating rod 13 drives the second conveying assembly to move through the second synchronous wheel 15 and the second synchronous belt; the prying piece 121 of the first conveying assembly is forced to convey the material on the upper screening plate 2 to avoid the accumulation of material falling from the feed port 101 in one place, affecting the screening efficiency of the material. At the same time, the prying piece 121 can pry the material on the upper screening plate 2, causing the material to roll and be screened quickly; similarly, the prying piece 121 of the second conveying assembly can also forcibly convey and pry the material on the lower screening plate 3 to accelerate particle separation.

[0089] like Figure 3 As shown, as a preferred embodiment, on the basis of the above method, it further includes: a first connecting rod 16 fixedly arranged between the outer frame 501 and the lower screening plate 3, a second connecting rod 17 fixedly arranged between the outer frame 501 and the upper screening plate 2, and the second connecting rod 17 is an elastic telescopic tube; the crushing frame 5 can drive the lower screening plate 3 to move back and forth synchronously through the first connecting rod 16, so that the material shakes on the lower screening plate 3 to accelerate the screening of the material, and the screening box 1 can be provided with a cleaning brush on the lower side of the lower screening plate 3, and the cleaning brush is used when the lower screening plate 3 moves back and forth It is scraped back and forth to ensure the screening efficiency of the lower screening plate; the second connecting rod 17 is an elastic telescopic tube, which drives the upper screening plate 2 to move as the crushing frame 5 moves. When the upper screening plate 2 abuts against the inner wall of the screening box 1, the second connecting rod 17 is compressed, and the crushing frame 5 will continue to move, causing the screening plate 502 in the outer frame 501 to move relative to the end of the upper screening plate 2, so that the material falling from the end of the upper screening plate 2 falls evenly into the screening plate 502 for crushing and grinding; the material screening efficiency is effectively improved by forcibly pushing the material through the conveying component and coordinating the synchronous shaking of the screening plate.

[0090] The application further discloses a use method of the screening mechanism for processing of a lithium battery graphite negative electrode material.

[0091] S1: pouring the graphite particles to be screened from a feeding port 101 at the top of the screening box 1, starting the driving motor 601, and rotating the driving shaft 602 to drive the first conveying assembly and the second conveying assembly to work;

[0092] S2: intercepting the large graphite particles on the upper screening plate 2, and pushing the large graphite particles to the end of the upper screening plate 2 by the first conveying assembly;

[0093] grading the lower screening plate 3: the particles meeting the production requirements are driven by the second conveying assembly to move to the first discharging port 102, and the fine powder after passing through the upper screening plate 2 continues to pass through the lower screening plate 3 and is discharged from the second discharging port 103;

[0094] S3: driving the displacement assembly to reciprocally move the crushing frame 5 left and right;

[0095] When the crushing frame 5 moves, the second gear 901 at the top of the elastic telescopic rod 9 is engaged with the upper rack 802, the screening disc 502 is driven to rotate relative to the outer frame body 501, and the materials falling from the end of the upper screening plate 2 are uniformly dispersed;

[0096] When the crushing frame 5 moves, the first gear 7011 is engaged with the lower rack 801, the spline sleeve tube 702 reciprocally moves up and down along the screw rod 701 in the axial direction, the large material on the screening disc 502 is extruded by the crushing plate 703 when the crushing plate 703 moves downward, and the qualified particles and the fine powder after crushing fall into the lower screening plate 3;

[0097] S4: the crushing frame 5 drives the lower screening plate 3 to synchronously reciprocally move through the first connecting rod 16, so that the materials shake on the lower screening plate 3 and the screening of the materials is accelerated;

[0098] The second connecting rod 17 is an elastic telescopic pipe, drives the upper screening plate 2 to move when the crushing frame 5 moves, is compressed when the upper screening plate 2 abuts against the inner wall of the screening box 1, and the crushing frame 5 continues to move, so that the screening disc 502 in the outer frame body 501 moves relative to the end of the upper screening plate 2, and the materials falling from the end of the upper screening plate 2 are uniformly dropped into the screening disc 502 to perform crushing and grinding work.

[0099] The drawings in the specification of the application are only schematic in nature and their dimensions and shapes are not actual limits but only a kind of schematic representation. In the actual implementation process, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0100] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A screening mechanism for processing graphite negative electrode materials for lithium batteries, comprising a screening box (1) with a feed port (101) opened on the top, characterized in that: Also includes: The screening part comprises an upper screening plate (2) and a lower screening plate (3) arranged in a screening box (1); a guide plate (4) for guiding materials to the front end of the lower screening plate (3) is provided on the lower side of the upper screening plate (2) inside the screening box (1); the screening box (1) is provided with a first discharge port (102) at the end of the lower screening plate (3) and a second discharge port (103) on the side away from the first discharge port (102); A crushing frame (5) is arranged between the end of the upper screening plate (2) and the front end of the lower screening plate (3); A driving mechanism comprising a displacement component for driving the crushing frame (5) to move back and forth and a crushing component for crushing the material in the crushing frame (5); Wherein, a first conveying assembly and a second conveying assembly are respectively provided on the upper side of the upper screening plate (2) and the lower screening plate (3), and a transmission part is provided between the first conveying assembly, the second conveying assembly and the driving mechanism, and the transmission part includes a synchronous belt transmission mechanism for driving the first conveying assembly and the second conveying assembly to work simultaneously and a gear transmission mechanism connected to the belt transmission mechanism; The crushing frame (5) comprises: The outer frame (501) is slidably arranged in the screening box (1); A screening disc (502) is rotatably connected to the outer frame (501); The displacement component is connected to the outer frame (501), and the crushing component is connected to the screening plate (502); The displacement assembly comprises: A support (6) is fixed on the screening box (1); A driving motor (601) is provided on the support (6); A drive shaft (602) connected to the output shaft of the drive motor (601); A connecting plate (603) is fixedly connected to the end of the driving shaft (602); A connecting rod (604) is provided at the end of the connecting plate (603); A connecting ring (605) is sleeved on the outside of the connecting rod (604); A movable rod (606) movably connected between the connecting ring (605) and the outer frame (501); The crushing assembly comprises: A movable plate (7) is slidably connected to the top of the screening box (1); A screw rod (701) is rotatably disposed in the movable plate (7); A spline sleeve tube (702) is threadedly connected to the screw rod (701); A crushing plate (703) is fixedly mounted on the bottom of the spline sleeve tube (702); A first gear (7011) is provided on the top of the screw rod (701); A rack (8) is fixed to the top of the screening box (1) and meshes with the first gear (7011); The first gear (7011) is meshed with the lower rack (801) of the rack rack (8); An elastic telescopic rod (9) is rotatably connected to the screw rod (701); A second gear (901) is provided on the top of the elastic telescopic rod (9); The second gear (901) is meshed with the upper rack (802) of the rack rack (8); The fixed end of the elastic telescopic rod (9) is rotatably connected to the screw rod (701) via a bearing, and the movable end of the elastic telescopic rod (9) is fixedly connected to the screening disc (502).

2. A screening mechanism for processing graphite negative electrode materials for lithium batteries according to claim 1, characterized in that: The outer frame (501) is slidably connected to an elastic telescopic positioning rod (10), the fixed end of which is connected to a slider (1001); A sliding groove (1002) for the sliding block (1001) to slide is provided in the outer frame (501), and an elastic element (1003) is provided between the inner wall of the sliding groove (1002) and the sliding block (1001); The elastic telescopic positioning rod (10) is provided with a first inclined surface (1004) and a second inclined surface (1005) at both ends respectively; The inner wall of the screening box (1) is fixedly provided with a wedge-shaped strip (11) that abuts against the first inclined surface (1004); The screening disc (502) is provided with an annular groove (5021) that cooperates with the movable end of the elastic telescopic positioning rod (10).

3. A screening mechanism for processing graphite negative electrode materials for lithium batteries according to claim 2, characterized in that: The first conveying assembly and the second conveying assembly have the same structure and both include: A plurality of conveying shafts (12) arranged in the screening box (1) are rotated at equal intervals; The material shifting pieces (121) are evenly distributed on each conveying shaft (12) in a circular shape.

4. A screening mechanism for processing graphite negative electrode materials for lithium batteries according to claim 3, characterized in that: The gear transmission mechanism comprises: A rotating rod (13) is rotatably connected to the screening box (1), and a driven gear (131) is provided at the end thereof; A driving gear (6021) is provided on the driving shaft (602) and meshes with the driven gear (131); The synchronous belt transmission mechanism comprises: A plurality of first synchronous wheels (14) are provided and are respectively placed on the drive shaft (602) and each conveying shaft (12) of the first conveying assembly, and a first synchronous belt is connected between the plurality of first synchronous wheels (14); A plurality of second synchronous wheels (15) are provided and are respectively placed on the rotating rod (13) and each conveying shaft (12) of the second conveying assembly. A second synchronous belt is connected between the plurality of second synchronous wheels (15).

5. A screening mechanism for processing graphite negative electrode materials for lithium batteries according to claim 4, characterized in that: Also includes: A first connecting rod (16) is fixedly arranged between the outer frame (501) and the lower screening plate (3); A second connecting rod (17) is fixed between the outer frame (501) and the upper screening plate (2); The second connecting rod (17) is an elastic telescopic tube.

6. A method for using a screening mechanism for processing graphite negative electrode materials for lithium batteries, applicable to the screening mechanism for processing graphite negative electrode materials for lithium batteries according to claim 5, characterized in that: The following steps are involved: S1: Pour the graphite particles to be screened from the feed port (101) at the top of the screening box (1), start the drive motor (601), the drive shaft (602) starts to rotate, and the transmission part drives the first conveying assembly and the second conveying assembly to work; S2: Upper screening plate (2) retention: Large particles of graphite are retained on the surface of the upper screening plate (2) and are pushed to the end of the upper screening plate (2) by the first conveying assembly; Lower screening plate (3) classification: particles and fine powder that meet the requirements pass through the upper screening plate (2), and the second conveying assembly drives the particles that meet the production requirements to move toward the first discharge port (102). The fine powder that passes through the upper screening plate (2) continues to pass through the lower screening plate (3) and is discharged from the second discharge port (103); S3: The displacement assembly drives the crushing frame (5) to move back and forth; When the crushing frame (5) moves, the second gear (901) at the top of the elastic telescopic rod (9) engages with the upper rack (802), driving the screening plate (502) to rotate relative to the outer frame (501), so that the material falling from the end of the upper screening plate (2) is evenly dispersed; When the screw rod (701) moves with the crushing frame (5), the first gear (7011) meshes with the lower rack (801), and the spline sleeve tube (702) reciprocates up and down along the axis of the screw rod (701). When the crushing plate (703) moves downward, the large particles on the screening plate (502) are squeezed, and the qualified particles and fine powder after crushing fall into the lower screening plate (3); S4: The crushing frame (5) drives the lower screening plate (3) to move back and forth synchronously through the first connecting rod (16), so that the material shakes on the lower screening plate (3) to accelerate the screening of the material; The second connecting rod (17) is an elastic telescopic tube, which drives the upper screening plate (2) to move as the crushing frame (5) moves. When the upper screening plate (2) abuts against the inner wall of the screening box (1), the second connecting rod (17) is compressed, and the crushing frame (5) continues to move, causing the screening plate (502) in the outer frame (501) to move relative to the end of the upper screening plate (2), so that the material falling from the end of the upper screening plate (2) falls evenly into the screening plate (502) for crushing and grinding.

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