Grading screening device

Abstract

The invention discloses a grading screening device, and relates to the technical field of graphite powder screening, the grading screening device comprises a rack main body, the inner side of the rack main body is provided with a lower box body assembly body, and the lower box body assembly body is provided with a middle box body assembly body and an upper box body assembly body which are used for screening graphite powder; the middle box body assembly body is located between the lower box body assembly body and the upper box body assembly body, the lower box body assembly body, the middle box body assembly body and the upper box body assembly body are each provided with an adjusting screening mechanism used for adjusting the screen, and the lower box body assembly body is further provided with a swing vibration mechanism used for driving screening. The middle box body assembly body is designed into a multi-layer screen body structure capable of being flexibly configured, each layer of screen cloth can be set with specific different mesh numbers according to needs, and the screen cloth is adjusted to the optimal inclination angle by means of the adjusting screening mechanism, so that the residence time of materials with different particle sizes is accurately matched with the screening penetration probability, and efficient and accurate grading of one layer and one particle size is achieved; and diversified granularity requirements are met.

Description

Technical Field

[0001] This invention relates to the field of graphite powder sieving technology, specifically to a grading and sieving device. Background Technology

[0002] Graphite powder, as an important industrial raw material, is widely used in batteries, lubricants, sealing materials, conductive coatings and other fields. Its quality is closely related to its particle size distribution, and the particle size requirements of graphite powder vary significantly in different application scenarios.

[0003] Therefore, fine grading and screening are key steps in ensuring product consistency and added value during graphite powder production. Currently, graphite powder screening mainly relies on two types of equipment: one is a high-square flat screen that uses a stacked structure of up to 100 to 150 layers of fixed-angle screens to achieve grading through overall vibration; the other is a swing screen that uses 3 to 5 layers of fixed screens to perform screening through low-frequency swinging motion.

[0004] The existing high-square flat screen uses the same vibration parameters (amplitude, frequency, and inclination angle) for all screen layers, making it impossible to match the optimal screen inclination angle for different particle sizes such as specific mesh sizes. When screening fine materials above 100 mesh (150μm), the screen aperture is close to the critical particle size. Because the inclination angle is not adjustable, the material residence time on the screen surface is short, and the probability of passing through the screen decreases. In addition, whether it is a high-square flat screen or a swing screen, the vibrator (the core power component of the screen machine, responsible for providing the vibration force required for screening) is installed at the bottom or middle of the equipment and forms a fixed connection structure with multiple screens. When the vibrator malfunctions and needs to be repaired or replaced, the operator has to remove each screen layer from top to bottom, resulting in a long downtime. Summary of the Invention

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide a grading and screening device. The problem it aims to solve is that the vibration parameters of the high-square flat screen are uniform, making it difficult to adapt to different particle size inclination angles. The screening effect is poor when screening fine materials of a specific mesh size. In addition, the vibrators and screens of both types of screens are fixed, and the screens need to be disassembled layer by layer for repair or replacement, resulting in long downtime.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a grading and screening device, comprising a frame body, a lower box assembly provided on the inner side of the frame body, a middle box assembly and an upper box assembly respectively provided on the lower box assembly for screening graphite powder, and the middle box assembly located between the lower box assembly and the upper box assembly, the lower box assembly, the middle box assembly and the upper box assembly are all provided with a screening adjustment mechanism for adjusting the screen, and the lower box assembly is also provided with a swing vibration mechanism for driving the screening; The middle box assembly and the upper box assembly are sequentially distributed above the lower box assembly. The lower box assembly, the middle box assembly, and the upper box assembly are all connected by high-strength bolts. The screens in the lower box assembly, the middle box assembly, and the upper box assembly are all inclinedly distributed by adjusting the screening mechanism.

[0008] In a preferred embodiment of the grading and screening device of the present invention, the adjusting screening mechanism includes screen supports respectively disposed in the corresponding lower box assembly, middle box assembly and upper box assembly. The screen supports are also provided with first screen supports for restricting the movement of the screen. The first screen supports are fixedly installed on the corresponding lower box assembly, middle box assembly and upper box assembly through the screen supports. A first pressing hook plate for adjusting the screen angle is also provided above the screen supports.

[0009] In a preferred embodiment of the grading and screening device of the present invention, a second screen support corresponding to the first screen support is fixedly installed on the screen support, and the screen in the screen support is located between the first screen support and the second screen support. A second pressing hook plate for adjusting the screen angle is also provided below the screen support. Adjustment grooves for limiting the sliding of the first pressing hook plate and the second pressing hook plate are respectively opened on the screen support.

[0010] In a preferred embodiment of the grading and screening device of the present invention, the middle box assembly includes a middle box body, and the middle box body has symmetrically distributed middle box fixing columns. The middle box body is fitted with a rear cover through the middle box fixing columns. The middle box body has symmetrically distributed middle box discharge trough fixing columns at one end away from the rear cover. The middle box body is fixedly fitted with a discharge trough frame for installing the middle box discharge trough through the middle box discharge trough fixing columns. The middle box discharge trough fixing columns have linearly arranged middle box hole covers, and the middle box hole covers are compatible with high-strength bolts on the middle box assembly.

[0011] In a preferred embodiment of the grading and screening device of the present invention, the upper box assembly includes an upper box body, and the upper box body has symmetrically distributed upper box rear cover fixing posts, and the upper box body is fitted with a rear cover through the upper box rear cover fixing posts. The upper box body has symmetrically distributed upper box discharge trough fixing posts at one end away from the rear cover, and the upper box body is fixedly fitted with a discharge trough frame for installing the upper box discharge trough through the upper box discharge trough fixing posts. The upper box body has linearly arranged upper box hole covers, and the upper box hole covers are compatible with high-strength bolts on the upper box assembly.

[0012] As a preferred embodiment of the grading and screening device of the present invention, the upper box assembly is further provided with an upper cover assembly for installing a material feeding device on the side away from the middle box assembly, and the top of the upper box body is provided with an upper box upper cover support beam adapted to the upper cover assembly, and the upper cover assembly is connected to the material feeding device through a flexible connecting pipe.

[0013] In a preferred embodiment of the grading and screening device of the present invention, the lower box assembly includes a lower box body, and the lower box body has symmetrically distributed lower box rear cover fixing posts. The lower box body is fitted with a rear cover via the lower box rear cover fixing posts. The lower box body has symmetrically distributed lower box discharge chute fixing posts at one end away from the rear cover. The lower box body is fixedly fitted with a discharge chute frame for installing the lower box discharge chute via the lower box discharge chute fixing posts. The lower box body has linearly arranged lower box hole covers, and the lower box hole covers are compatible with high-strength bolts on the upper box assembly. The lower box assembly also has a screening receiving tray corresponding to the screen on the lower box body.

[0014] In a preferred embodiment of the grading and screening device of the present invention, the screening receiving tray is inclined downward at one end near the discharge trough of the lower box body, and a material tray support beam is also installed at one end of the lower box body near the discharge trough. The screening receiving tray is fixedly installed below the screen in the lower box body through the material tray support beam.

[0015] As a preferred embodiment of the grading and screening device of the present invention, the swing vibration mechanism includes a motor assembly driven by a belt, and the motor assembly is respectively provided with a small pulley cover and a large pulley cover for protecting the pulley. The swaying vibration mechanism also includes a drive box assembly, which contains a vibrator assembly for eccentric vibration. The lower box assembly also has vertically distributed drive box beam plates, and the drive box assembly is connected to the column base assembly through the drive box beam plates. The column base assembly has a cross shaft seat with a telescopic long universal coupling connected to the frame body.

[0016] As a preferred embodiment of the grading and screening device of the present invention, the main body of the frame is welded from thick-walled square tubes, and the top of the main body of the frame is provided with lifting lugs for hoisting. The discharge ports of the lower box assembly, the middle box assembly and the upper box assembly face the same direction and are all inclined downwards.

[0017] In summary, the present invention has at least one of the following beneficial effects: 1. This invention designs the middle box assembly as a multi-layer flexibly configurable screen structure. Each layer of screen can be set with a specific mesh size as needed, and the tilt angle can be adjusted to the optimal angle by adjusting the screening mechanism. This allows for precise matching of the residence time and screening probability of materials of different particle sizes, achieving efficient and accurate grading of one particle size per layer, and meeting diverse particle size requirements.

[0018] 2. This invention, by setting a material distribution device with multiple sets of guide plates on the upper cover assembly, and cooperating with a 30-40 mesh low-mesh screen on the upper box assembly, can not only evenly disperse the graphite powder to be screened onto the screen surface to avoid local accumulation, but also efficiently filter large particle impurities, thereby achieving uniform feeding and impurity separation in the material pretreatment stage, laying a stable foundation for subsequent core grading.

[0019] 3. This invention uses high-strength bolts to achieve a tight connection between the lower box assembly, the middle box assembly, and the upper box assembly. Combined with the lifting lugs at the top of the main frame, during the overall disassembly and assembly of the equipment, the high-strength bolts ensure the stable connection of each screening unit, preventing loosening or misalignment of components during disassembly and assembly. The lifting lugs also facilitate the overall hoisting of the equipment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a diagram showing the assembly of the middle box body and the adjusting screening mechanism of the present invention. Figure 3 This is a side view of the middle box assembly of the present invention; Figure 4 This is a cross-sectional view of the middle box assembly of the present invention; Figure 5 This is a structural diagram of the assembled upper housing of the present invention; Figure 6 This is a cross-sectional view of the upper housing assembly of the present invention; Figure 7 This is a structural diagram of the lower housing assembly and the rocking vibration mechanism of the present invention; Figure 8 This is a side view of the assembled lower housing structure of the present invention.

[0022] Explanation of reference numerals in the attached figures: 1. Main frame; 101. Telescopic long universal coupling; 102. Lifting lug; 2. Lower housing assembly; 201. Lower housing main body; 202. Lower housing rear cover fixing post; 203. Lower housing discharge chute fixing post; 204. Lower housing discharge chute; 205. Lower housing hole cover; 3. Middle housing assembly; 301. Middle housing main body; 302. Middle housing fixing post; 303. Middle housing discharge chute fixing post; 304. Middle housing discharge chute; 305. Middle housing hole cover; 4. Upper housing assembly; 401. Upper housing main body; 402. Upper housing rear cover fixing post; 403. Upper box discharge chute fixing column; 404. Upper box discharge chute; 405. Upper box hole cover; 406. Upper box cover support beam; 407. Upper cover assembly; 5. Adjustable screening mechanism; 501. Screen support; 502. First screen support; 503. First clamping hook plate; 504. Second screen support; 505. Second clamping hook plate; 6. Screen receiving tray; 601. Tray support beam; 7. Motor assembly; 701. Small pulley cover; 702. Large pulley cover; 8. Drive box assembly; 801. Drive box beam plate; 9. Column base assembly. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] This invention discloses a grading and screening device.

[0025] Example 1 Reference Figure 1-8This is the first embodiment of the present invention, providing a grading and screening device. This device includes a frame body 1, with a lower housing assembly 2 located inside the frame body 1. A middle housing assembly 3 and an upper housing assembly 4 for screening graphite powder are respectively located on the upper part of the lower housing assembly 2, with the middle housing assembly 3 situated between the lower housing assembly 2 and the upper housing assembly 4. Each of the lower housing assembly 2, the middle housing assembly 3, and the upper housing assembly 4 is equipped with an adjusting screening mechanism 5 for adjusting the screen mesh. The lower housing assembly 2 also has a swinging vibration mechanism for driving the screening. The middle housing assembly 3 and the upper housing assembly 4 are sequentially distributed above the lower housing assembly 2, and are connected by high-strength bolts. The screen meshes in the lower housing assembly 2, the middle housing assembly 3, and the upper housing assembly 4 are all inclinedly distributed through the adjusting screening mechanism 5. The frame body 1 serves as the core support frame and adopts a multi-level modular design. To ensure a stable and efficient screening process, the lower box assembly 2 is topped with the middle box assembly 3 and the upper box assembly 4 stacked sequentially from top to bottom. The middle box assembly 3 is located in the middle key grading layer, receiving the pre-treated material from the upper box assembly 4 and completing the core particle size separation. Its quantity can be increased or decreased according to actual usage needs. The upper box assembly 4 serves as the top-level pre-treatment unit, realizing the initial screening of materials and impurity filtration. The screen mechanism 5 can be adjusted to flexibly adjust the tilt angle and fixation state of the screens in the corresponding layers. The swing vibration mechanism provides continuous and stable vibration force for the screening operation of the whole machine. The lower box assembly 2, the middle box assembly 3, and the upper box assembly 4 are tightly connected as a whole by high-strength bolts to avoid component displacement during vibration and facilitate overall disassembly and maintenance during grading. The internal screens of the three are all tilted by adjusting the screen mechanism 5, which not only ensures that the material moves evenly on the screen surface but also improves the screening efficiency, forming a complete screening process of "pre-treatment - core grading - fine inspection".

[0026] The adjustable screening mechanism 5 includes screen supports 501 respectively disposed in the corresponding lower box assembly 2, middle box assembly 3, and upper box assembly 4. The screen supports 501 are also provided with first screen supports 502 for limiting the movement of the screen. The first screen supports 502 are fixedly installed on the corresponding lower box assembly 2, middle box assembly 3, and upper box assembly 4 through the screen supports 501. Above the screen supports 501, there is also a first pressing hook plate 503 for adjusting the screen angle. The adjustable screening mechanism 5 is a key component for achieving accurate screening of materials of different particle sizes. It adopts a "two-way support and adjustable limit" design to adapt to the flexible adjustment requirements of the screen angle. The screen supports 501 are the basic frame and are embedded in the corresponding mounting slots of the lower box assembly 2, middle box assembly 3, and upper box assembly 4 to provide stable support for the screen.

[0027] A second screen support 504, corresponding to the first screen support 502, is also fixedly installed on the screen support 501. The screen in the screen support 501 is located between the first screen support 502 and the second screen support 504. A second clamping hook plate 505 for adjusting the screen angle is also provided below the screen support 501. Adjustment grooves for limiting the sliding of the first clamping hook plate 503 and the second clamping hook plate 505 are respectively opened on the screen support 501. The first screen support 502 and the second screen support 504 are symmetrically assembled on the screen support 501. The two are fixed to the screen support 501 by bolts, clamping the screen in the middle and restricting the screen to a certain extent. The lateral and longitudinal offsets during vibration ensure screening accuracy. The first clamping hook plate 503 and the second clamping hook plate 505 are located on the upper and lower sides of the screen, respectively. The engagement between the hook plates and the edge of the screen further enhances the stability of the screen. The first clamping hook plate 503 and the second clamping hook plate 505 can slide along the adjustment groove through their corresponding screw structures. The operator can adjust the fixed position of the hook plates in the adjustment groove according to the particle size of the material to be screened (e.g., fine materials above 100 mesh need to increase the inclination angle to prolong the residence time, and coarse materials of 50 mesh need to decrease the inclination angle to improve the screening efficiency), thereby changing the tilt angle of the screen so that each layer of screen can match the optimal screening parameters for the corresponding particle size.

[0028] The middle box assembly 3 includes a middle box body 301, with symmetrically distributed middle box fixing posts 302 on the middle box body 301. A rear cover is installed on the middle box body 301 via the middle box fixing posts 302. A symmetrically distributed middle box discharge chute fixing post 303 is provided at the end of the middle box body 301 away from the rear cover. A discharge chute frame for installing the middle box discharge chute 304 is fixedly installed on the middle box body 301 via the middle box discharge chute fixing posts 303. The middle box discharge chute fixing posts 303 have linearly arranged middle box hole covers 305, which are compatible with high-strength bolts on the middle box assembly 3. The middle box assembly 3 serves as the core grading unit, with the middle box body 301 as its main body. The number of these covers can be increased according to actual usage requirements. Even if the middle box assembly 3 is completely disassembled, the lower box assembly 2 and the upper box assembly 4 can still operate normally after being combined. The middle box fixing column 302 is used to connect the rear cover. The rear cover is fastened to the fixing column by bolts, thereby achieving a seal at the rear end of the middle box and preventing graphite powder from leaking out from the gaps during vibration, thus reducing material loss. The middle box discharge chute fixing column 303 is used to install the discharge chute frame. The middle box discharge chute 304 is fixed inside the chute frame. Different particle sizes of graphite powder after grading can be accurately discharged to the corresponding collection device through the discharge chute to avoid mixing. The middle box hole cover 305 has a hole diameter that is compatible with the high-strength bolts used for connection. When it is necessary to replace the screen or maintain the internal components, it is only necessary to remove the hole cover to loosen the bolts, and the entire box can be disassembled, which greatly improves maintenance efficiency.

[0029] The upper housing assembly 4 includes an upper housing body 401, with symmetrically distributed upper housing rear cover fixing posts 402 on the upper housing body 401. A rear cover is mounted on the upper housing body 401 via the upper housing rear cover fixing posts 402. Symmetrically distributed upper housing discharge chute fixing posts 403 are provided at one end of the upper housing body 401 away from the rear cover. A discharge chute frame for mounting the upper housing discharge chute 404 is fixedly installed on the upper housing body 401 via the upper housing discharge chute fixing posts 403. The upper box body has linearly arranged upper box body cover 405, which is compatible with the high-strength bolts on the upper box body assembly 4. The upper box body assembly 4, as the top pretreatment unit, can complement the middle box body assembly 3 to achieve uniform feeding and initial screening and impurity removal. It is mainly used to filter large particle impurities in graphite powder. Its structure is similar to that of the middle box body assembly 3. The upper box body cover 405 on the upper box body 401 is compatible with the high-strength bolts, which facilitates quick disassembly and maintenance and allows for complete disassembly and assembly.

[0030] On the side of the upper box assembly 4 away from the middle box assembly 3, there is also an upper cover assembly 407 for installing the material distribution device. The top of the upper box body 401 is provided with an upper cover support beam 406 that is adapted to the upper cover assembly 407. The upper cover assembly 407 is connected to the material distribution device through a flexible connecting pipe. The upper cover assembly 407 is used to install the material distribution device. External material enters the material distribution device through the flexible connecting pipe. The material distribution device evenly spreads the material onto the screen surface inside the upper box body 401 through a multi-channel dispersion structure, ensuring uniform material distribution on the screen surface and avoiding local overload that affects screening efficiency. The upper cover support beam 406 provides stable support for the upper cover assembly 407 and ensures that the position of the material distribution device is fixed during vibration through bolt connection.

[0031] The lower housing assembly 2 includes a lower housing body 201, on which symmetrically distributed lower housing rear cover fixing posts 202 are provided. A rear cover is mounted on the lower housing body 201 via the lower housing rear cover fixing posts 202. A symmetrically distributed lower housing discharge chute fixing post 203 is provided at the end of the lower housing body 201 away from the rear cover. A discharge chute frame for installing the lower housing discharge chute 204 is fixedly installed on the lower housing body 201 via the lower housing discharge chute fixing posts 203. Linearly arranged lower housing hole covers are provided on the lower housing body 201. 205, and the lower box body hole cover 205 is compatible with the high-strength bolts on the upper box body assembly 4. The lower box body assembly 2 is also equipped with a screening tray 6 corresponding to the screen on the lower box body main body 201. The main body of the lower box body assembly 2 is the lower box body main body 201, which supports the entire device. The finest high-mesh screen is installed in the hollow frame. The structure is similar to that of the middle box body assembly 3. As a power bearing unit, the lower box body assembly 2 also has a reserved installation interface for the swing vibration mechanism to ensure seamless connection between the power unit and the screening unit and realize efficient transmission of vibration force.

[0032] The screening tray 6 is inclined downward at one end near the discharge trough 204 of the lower box body. A material tray support beam 601 is also installed at one end of the lower box body 201 near the discharge trough 204. The screening tray 6 is fixedly installed below the screen in the lower box body 201 through the material tray support beam 601. The inclined setting of the screening tray 6 can ensure that the fine material after screening can slide into the discharge trough along the inclined surface to avoid material accumulation. The material tray support beam 601 provides fixed support for the screening tray 6 to prevent the tray from shifting during vibration.

[0033] The oscillating vibration mechanism includes a motor assembly 7 driven by a belt. The motor assembly 7 is equipped with a small pulley cover 701 and a large pulley cover 702 for protecting the pulleys. The oscillating vibration mechanism also includes a drive box assembly 8, which contains a vibrator assembly for eccentric vibration. The lower box assembly 2 is also equipped with vertically distributed drive box beam plates 801. The drive box assembly 8 is connected to the column base assembly 9 through the drive box beam plates 801. The cross shaft seat on the column base assembly 9 is equipped with a telescopic long universal coupling 101 connected to the frame body 1. The oscillating vibration mechanism is the source of power for the screening of the whole machine. It adopts a belt drive and eccentric centrifugal design. The core power source is the motor assembly 7. The motor transmits power to the drive box assembly 8 through the belt. The small pulley cover 701 and the large pulley cover 702 prevent foreign objects from being caught or personnel from accidentally touching the vibrator. The motor drives the vibrator assembly to rotate at high speed through the belt. The centrifugal force generated by its eccentric structure is converted into the oscillating vibration force required by the whole machine. The drive box girder plate 801 provides fixed support for the drive box assembly 8, ensuring a tight connection between the power unit and the lower box and avoiding vibration force loss. In addition, the cross shaft seat on the column base assembly 9 is equipped with a telescopic long universal coupling 101 connected to the frame body 1. The telescopic characteristics of this coupling can adapt to the displacement changes during vibration. Its cross shaft structure ensures the stability of the vibration force transmission direction and avoids structural damage caused by rigid connection between the frame and the box, thereby ensuring the long-term stable operation of the whole machine.

[0034] The main frame 1 is welded from thick-walled square tubing, and the top of the main frame 1 is equipped with lifting lugs 102 for hoisting. The discharge ports of the lower box assembly 2, the middle box assembly 3, and the upper box assembly 4 all face the same direction and are all inclined downwards. The main frame 1, formed by welding thick-walled square tubing, provides rigid support for the entire machine, preventing deformation of the frame during vibration. The lifting lugs 102 at the top facilitate the overall hoisting, transportation, and on-site installation and commissioning of the equipment. Connected by a telescopic long universal coupling 101, it not only achieves flexible transmission of vibration force but also ensures the balance of the screening assembly composed of the lower box, middle box, and upper box during vibration thanks to the stable support of the frame. In addition, the height of the frame can be flexibly adjusted according to the total height of the screen body to adapt to different workshop installation environments. When using this device to screen graphite powder, the upper cover assembly 407 at the top of the upper box assembly 4 serves as the feed inlet. The graphite powder to be screened enters the material distribution device built into the upper cover assembly 407 through the flexible connecting pipe. The material distribution device disperses the material evenly through multiple sets of guide plates to avoid the material from accumulating in a local area of ​​the screen and to ensure that the screen surface inside the upper box body 401 is subjected to uniform force. The screen mesh size inside the upper box assembly 4 is set to 30-40 mesh (low mesh). Driven by the swing vibration mechanism, the upper box vibrates synchronously with the whole machine. The material moves along the preset trajectory on the inclined screen surface. Large particles of impurities (such as graphite lumps and ore fragments) cannot pass through the screen and are conveyed to the upper box discharge trough 404 for discharge, thus completing the impurity filtration. The material that meets the initial screening requirements passes through the screen and falls into the middle box assembly 3 for core grading, thus achieving the functional goal of pre-treatment and impurity removal. The middle box assembly 3 serves as the core grading unit. Based on the user's specific requirements for the particle size of graphite powder, multiple layers of screens can be flexibly configured. The mesh size of each screen layer can be set as needed: typically, the first layer of screens has a mesh size of 50 mesh, which is used to separate the high-value large flake graphite in the graphite powder. Under the vibration of the whole machine, the large flake graphite cannot pass through the screen because its particle size is larger than the screen hole. It is collected separately through the discharge trough 304 of the middle box, while the material smaller than 50 mesh passes through the screen and enters the next layer. If further particle size separation is required (e.g., 80 mesh, 100 mesh), corresponding mesh sizes of screens are configured in the second and third layers: the 80 mesh screen separates medium-sized graphite powder, and the 100 mesh screen separates finer-sized materials. Materials of different particle sizes are discharged through their respective corresponding discharge troughs 304 in the middle housing, achieving precise grading of one particle size per layer. Each layer of screens within the middle housing assembly 3 is adjusted to the optimal tilt angle via the screening mechanism 5 to ensure that the residence time and screening probability of materials of different mesh sizes are matched. The lower housing assembly 2 serves as the core of the machine's power system and a fine inspection unit. Its internal screen mesh is set to the highest level to perform final inspection and screening of the fine material after it has passed through the middle housing assembly 3. This ensures that the particle size of the discharged material fully meets the requirements. Under vibration, if a small amount of coarse particles are still mixed in the fine material, they will be intercepted by the lower housing screen and discharged separately through the lower housing discharge trough 204 to avoid affecting product quality. Fine material that fully meets the requirements falls into the screening receiving tray 6 after passing through the screen and slides along the inclined receiving tray into the fine material channel of the lower housing discharge trough 204 to complete the final screening. Meanwhile, the motor assembly 7 on the lower box assembly 2 provides power to the whole machine: after the motor starts, it drives the vibrator assembly (eccentric mechanism) in the drive box assembly 8 to rotate at high speed through the large and small pulleys. The centrifugal force generated by the eccentric structure directly acts on the lower box assembly 2. Since the lower box, middle box and upper box are connected as a whole by high-strength bolts, the centrifugal force drives the entire screening unit to swing and vibrate synchronously, so that each layer of screen gets a stable vibration force, ensuring that the material moves continuously on the screen surface and completes screening and grading. The frame body 1 is connected to the lower housing assembly 2 via a telescopic long universal coupling 101. While transmitting vibration force, the frame provides stable support for the screening unit through its rigid structure. On the one hand, the frame can offset some of the reaction force generated by vibration, preventing overall displacement of the equipment during operation. On the other hand, the telescopic characteristics of the telescopic long universal coupling 101 can adapt to the small displacement of the screening unit during vibration, preventing stress concentration between the frame and the housing due to rigid connection, and extending the service life of the equipment.

[0035] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A grading and screening device, characterized in that: The machine includes a frame body (1), and a lower box assembly (2) is provided on the inner side of the frame body (1). A middle box assembly (3) and an upper box assembly (4) for screening graphite powder are respectively provided on the lower box assembly (2). The middle box assembly (3) is located between the lower box assembly (2) and the upper box assembly (4). The lower box assembly (2), the middle box assembly (3) and the upper box assembly (4) are all provided with a screening adjustment mechanism (5) for adjusting the screen. The lower box assembly (2) is also provided with a swing vibration mechanism for driving the screening. The middle box assembly (3) and the upper box assembly (4) are sequentially distributed above the lower box assembly (2). The lower box assembly (2), the middle box assembly (3), and the upper box assembly (4) are all connected by high-strength bolts. The screens in the lower box assembly (2), the middle box assembly (3), and the upper box assembly (4) are all inclined by adjusting the screening mechanism (5).

2. The grading and screening device according to claim 1, characterized in that, The adjusting screening mechanism (5) includes screen supports (501) respectively disposed in the corresponding lower box assembly (2), middle box assembly (3) and upper box assembly (4). The screen supports (501) are also provided with first screen supports (502) for restricting the movement of the screen. The first screen supports (502) are fixedly installed on the corresponding lower box assembly (2), middle box assembly (3) and upper box assembly (4) through the screen supports (501). A first pressing hook plate (503) for adjusting the screen angle is also provided above the screen supports (501).

3. The grading and screening device according to claim 2, characterized in that, The screen support (501) is also fixedly installed with a second screen support (504) corresponding to the first screen support (502), and the screen in the screen support (501) is located between the first screen support (502) and the second screen support (504). A second pressing hook plate (505) for adjusting the screen angle is also provided below the screen support (501). Adjustment grooves for limiting the sliding of the first pressing hook plate (503) and the second pressing hook plate (505) are respectively opened on the screen support (501).

4. The grading and screening device according to claim 1, characterized in that, The middle box assembly (3) includes a middle box body (301), and the middle box body (301) has symmetrically distributed middle box fixing columns (302). The middle box body (301) is equipped with a rear cover through the middle box fixing columns (302). The middle box body (301) is provided with symmetrically distributed middle box discharge trough fixing columns (303) at one end away from the rear cover. The middle box body (301) is fixedly installed with a discharge trough frame for installing the middle box discharge trough body (304) through the middle box discharge trough fixing columns (303). The middle box discharge trough fixing columns (303) are provided with linearly arranged middle box hole covers (305), and the middle box hole covers (305) are compatible with the high-strength bolts on the middle box assembly (3).

5. The grading and screening device according to claim 1, characterized in that, The upper box assembly (4) includes an upper box body (401), and the upper box body (401) has symmetrically distributed upper box rear cover fixing posts (402), and the upper box body (401) is fitted with a rear cover through the upper box rear cover fixing posts (402). The upper box body (401) has symmetrically distributed upper box discharge slot fixing posts (403) at one end away from the rear cover, and the upper box body (401) is fixedly fitted with a discharge slot frame for installing the upper box discharge slot body (404) through the upper box discharge slot fixing posts (403). The upper box body (401) has linearly arranged upper box hole covers (405), and the upper box hole covers (405) are adapted to the high-strength bolts on the upper box assembly (4).

6. The grading and screening device according to claim 5, characterized in that, The upper box assembly (4) is provided with an upper cover assembly (407) for installing a fabric placement device on the side away from the middle box assembly (3), and the top of the upper box body (401) is provided with an upper box upper cover support beam (406) adapted to the upper cover assembly (407), and the upper cover assembly (407) is connected to the fabric placement device through a flexible connecting pipe.

7. The grading and screening device according to claim 5, characterized in that, The lower box assembly (2) includes a lower box body (201), and the lower box body (201) has symmetrically distributed lower box rear cover fixing posts (202), and the lower box body (201) is fitted with a rear cover through the lower box rear cover fixing posts (202). The lower box body (201) has symmetrically distributed lower box discharge trough fixing posts (203) at one end away from the rear cover, and the lower box body (201) is fixedly fitted with a discharge trough frame for installing the lower box discharge trough body (204) through the lower box discharge trough fixing posts (203). The lower box body (201) has linearly arranged lower box hole covers (205), and the lower box hole covers (205) are adapted to the high-strength bolts on the upper box assembly (4). The lower box assembly (2) is also provided with a screening tray (6) corresponding to the screen on the lower box body (201).

8. The grading and screening device according to claim 7, characterized in that, The screening tray (6) is inclined downward at one end near the discharge trough (204) of the lower box body. The lower box body (201) is also equipped with a material tray support beam (601) at one end near the discharge trough (204). The screening tray (6) is fixedly installed below the screen in the lower box body (201) through the material tray support beam (601).

9. The grading and screening device according to claim 1, characterized in that, The swing vibration mechanism includes a motor assembly (7) driven by a belt, and the motor assembly (7) is provided with a small pulley cover (701) and a large pulley cover (702) for protecting the pulley. The swing vibration mechanism also includes a drive box assembly (8), which is provided with a vibrator assembly for eccentric vibration. The lower box assembly (2) is also provided with vertically distributed drive box beam plates (801). The drive box assembly (8) is connected to the column base assembly (9) through the drive box beam plates (801). The column base assembly (9) is provided with a telescopic long universal coupling (101) connected to the frame body (1) on the cross shaft seat.

10. The grading and screening device according to claim 9, characterized in that, The main body of the frame (1) is welded from thick-walled square tubes, and the top of the main body of the frame (1) is provided with a lifting lug (102) for hoisting. The discharge ports of the lower box assembly (2), the middle box assembly (3) and the upper box assembly (4) face the same direction and are all inclined downwards.

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