A large, medium and small three-stage continuous screening device and control system for petroleum post-forging coke

Abstract

The application discloses a large, medium and small three-stage continuous screening device and a control system for petroleum forged coke, relates to the field of petroleum forged coke, and is characterized in that two feeding conveyors are arranged on the sides close to each other of two material boxes, two pair-roller crushers are arranged at the discharging ends of the two feeding conveyors, the pair-roller crushers are arranged on the brackets, two collecting covers are fixedly arranged on the bottom sides of the brackets, and the two collecting covers are fixedly provided with temporary storage boxes. The application eliminates the process transfer link through integrated design, cooperates with a multi-stage negative pressure dust collection system to inhibit dust overflow in the whole process, pre-spraying aeration and shaking are used to pretreat and scatter the material clumps, the risk of screen mesh blockage is reduced from the source, three-layer screen meshes are used to screen three kinds of finished products with different particle sizes at one time, the screening precision is high, the impact balls automatically clean the screen meshes during the screening process, the flushing and sewage discharge structure is used to realize the self-cleaning of the equipment, the overall operation is continuous and stable, and the forging coke screening production efficiency and the operation environment quality are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of petroleum post-forging coke technology, and in particular to a three-stage continuous screening device and control system for petroleum post-forging coke of various sizes. Background Technology

[0002] Calcinated petroleum coke, also known as calcined petroleum coke or simply calcined coke, is a carbon particle raw material obtained by calcining raw petroleum coke produced by oil refineries at a high temperature of 1200~1350℃ in the absence of air. Raw coke has high moisture content, volatile oil content, and poor electrical conductivity. After high-temperature calcination, moisture, volatile matter, and some impurities are removed, resulting in a dense and stable structure.

[0003] Existing technologies for screening calcined coke suffer from the following shortcomings: First, the crushing and screening processes are dispersed, requiring multiple transfers of materials between different devices, resulting in a discontinuous process, low production efficiency, severe dust generation during transfers, and a harsh working environment. Second, the uneven moisture content and tendency to agglomerate of materials before screening easily clog the screens, affecting screening efficiency and particle size accuracy. Third, conventional screening equipment uses a single screen aperture, making it impossible to continuously screen large, medium, and small sizes in one operation, requiring multiple devices to be used in series, resulting in large floor space and high energy consumption. Fourth, the screens are easily clogged by powder during screening, requiring frequent cleaning and maintenance, which affects continuous operation. Fifth, the overall sealing of the equipment is insufficient, leading to dust spillage during crushing and screening, polluting the environment and posing a dust explosion hazard. Therefore, there is a need for an integrated crushing, multi-stage screening, and dust control system for continuous screening of large, medium, and small sizes of petroleum calcined coke to meet these needs. Summary of the Invention

[0004] The purpose of this invention is to provide a three-stage continuous screening device and control system for petroleum calcined coke, including large, medium and small sizes, to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a three-stage continuous screening device and control system for petroleum calcined coke, comprising a material box, a double roller crusher, a feeding conveyor, a screening conveyor, and a screening unit;

[0006] The two feeding conveyors are respectively installed on the side of the two material boxes that are close to each other. The two roller crushers are respectively installed at the discharge end of the two feeding conveyors. The roller crushers are installed on the support. Two collection covers are fixedly installed on the bottom side of the support. Temporary storage boxes are fixedly installed on the two collection covers. The two ends of the screening conveyor are connected to the temporary storage boxes and the screening unit.

[0007] Preferably, the feeding conveyor includes a housing, a fixed bracket is fixedly installed on the bottom side of the housing, a conveyor bracket is provided inside the housing, a chain conveyor belt is arranged inside the conveyor bracket, a drive for the chain conveyor belt to rotate is arranged on the conveyor bracket, a clamping plate is fixedly installed on the chain conveyor belt, and the end of the housing is connected to the roller crusher through a dust cover.

[0008] Preferably, the screening conveyor includes a housing second, an internal chain conveyor is installed inside the housing second, and a dust cover second is installed between the output end of the housing second and the screening unit.

[0009] Preferably, the screening unit includes a fixed frame, in which a vibrating screen is fixedly installed. The inner wall of the vibrating screen is provided with screen one, screen two, and screen three. Three discharge pipes are fixedly installed on the outer side of the fixed frame. The three discharge pipes are respectively adapted to screen one, screen two, and screen three. A storage box is provided at the output end of each of the three discharge pipes.

[0010] Preferably, connecting ropes are arranged on screen one, screen two, and screen three, and impact balls are fixedly installed at the ends of the connecting ropes.

[0011] Preferably, a vibration motor is arranged on the bottom side of the vibrating screen, and a sewage pipe is also installed at the bottom of the vibrating screen.

[0012] Preferably, the material box is equipped with an air curtain machine at its inlet and a dust collection pipe is also provided on the material box.

[0013] Preferably, a uniform plate is rotatably installed on the inner wall of the material box, a guide plate is fixedly installed on the top side of the uniform plate, and a guide plate is fixedly installed on the bottom side of the uniform plate. Rotating seat one and rotating seat two are fixedly installed on the material box and the uniform plate respectively. One end of rotating seat two is slidably installed in rotating seat one. A spring is fixedly installed on the inner wall of rotating seat one, and a sliding plate is fixedly installed on one end of rotating seat two. The spring and the sliding plate are fixedly connected.

[0014] Preferably, a spray pipe and a protective net are fixedly installed on the top inner wall of the material box, an aeration plate is fixedly installed on the bottom inner wall of the material box, and a filter block and a drain pipe are also fixedly installed on the bottom side of the material box.

[0015] The beneficial effects of this invention are:

[0016] 1. This invention adopts an integrated continuous operation with full-process dust prevention and pollution control. This device connects the feeding and conveying, roller crushing, and multi-stage screening processes into a closed-loop continuous operation path, eliminating intermediate material transfer links, directly improving production efficiency, and reducing dust diffusion during the transfer process at the source. Combined with the inlet air curtain machine to form a closed air curtain barrier, and a multi-stage negative pressure dust collection system to centrally collect dust from conveying docking points, screening chambers, and other dust-generating points, it achieves full-process dust suppression from the inlet to the outlet, significantly improving the working environment and reducing dust safety hazards.

[0017] 2. This invention employs a pre-treatment method to prevent agglomeration, ensuring smooth screening from the source. The device integrates a shaking and equalizing structure with a spray aeration and anti-agglomeration structure within the material box. The reciprocating shaking of the equalizing plate, combined with the upper and lower guide plates, disperses the falling material, preventing it from accumulating and agglomerating. Simultaneously, the spray pipe moderately wets the material surface to reduce fine dust generation, while the bottom aeration plate continuously blows in airflow to loosen the material layer. This dual action breaks up the coke agglomerates after forging, reducing the probability of material clumping and clogging the screen at the feed end, thus providing a pre-treatment guarantee for the stable and efficient operation of subsequent crushing and screening processes.

[0018] 3. This invention employs a three-stage grading precision screening method, with self-cleaning to reduce maintenance costs. The screening unit has a built-in three-layer gradient aperture screen, which can simultaneously produce three different particle size specifications of calcined coke products in a single screening. The screening particle size is accurate and the processing efficiency is high. There is no need for multiple screening devices to be arranged in series, which greatly reduces the equipment footprint. The impact ball suspended with the screen continuously hits the screen surface with the high-frequency vibration of the screening machine, which can automatically remove the powder adhering to the screen holes, realizing dynamic self-cleaning during the screening process and reducing the frequency of manual shutdown for screen cleaning. After screening, clean water can be introduced through the sewage pipe to quickly rinse the inside of the screening machine. Impurities and sewage are discharged in a centralized manner along the collection structure, making the daily maintenance of the equipment simple and efficient.

[0019] 4. This invention adopts multi-unit collaborative management and control, which is stable and reliable in operation. The supporting control system is divided into multiple independent control units according to function. It can control the entire process of pretreatment, feeding and crushing, screening and discharging, and clearing blockage and sewage discharge in a time-series linkage. At the same time, it has the functions of abnormal detection and graded protection of pipeline pressure and motor current. It has a high degree of automation, which can effectively avoid equipment overload damage and ensure the long-term continuous and stable operation of the production line. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a three-stage continuous screening device for petroleum calcined coke of the present invention, which is used in large, medium and small stages.

[0021] Figure 2 This is a top view schematic diagram of a three-stage continuous screening device for petroleum calcined coke of the present invention, which is used in large, medium and small stages.

[0022] Figure 3This is a side view of a three-stage continuous screening device for petroleum calcined coke of the present invention, which is a schematic diagram of the structure of the device.

[0023] Figure 4 This is a schematic diagram of the chain conveyor belt section of a three-stage continuous screening device for petroleum calcined coke of the present invention.

[0024] Figure 5 This is a schematic diagram of the screening unit of a three-stage continuous screening device for petroleum calcined coke of the present invention.

[0025] Figure 6 This is a schematic diagram of the material box part of a three-stage continuous screening device for petroleum calcined coke of the present invention;

[0026] Figure 7 This is a schematic diagram of a portion of the rotating seat of a three-stage continuous screening device for petroleum calcined coke of the present invention.

[0027] In the diagram: 1. Material bin; 101. Support frame; 102. Collection cover; 103. Temporary storage bin; 2. Roller crusher; 201. Feed hopper; 3. Feeding conveyor; 301. Shell 1; 302. Fixed support; 303. Dust cover 1; 304. Conveyor bracket; 305. Chain conveyor belt; 306. Motor; 307. Pallet; 4. Screening conveyor; 401. Shell 2; 402. Internal chain conveyor; 403. Dust cover 2; 5. Screening unit; 501. Fixed frame; 502. Vibrating screen; 503. Screen 1; 504. 505. Screen 2; 506. Screen 3; 507. Discharge pipe; 508. Storage box; 509. Connecting rope; 510. Impact ball; 511. Vibration motor 1; 512. Sewage pipe; 6. Air curtain machine; 601. Equalizing plate; 602. Guide plate; 603. Vibration motor 2; 604. Rotating seat 1; 605. Rotating seat 2; 606. Slide plate; 607. Spring; 608. Aeration plate; 609. Spray pipe; 610. Protective net; 611. Filter block; 612. Drain pipe; 7. Dust collection pipe 1; 701. Dust collection pipe 2; 702. Dust collection pipe 3. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Example 1: As Figures 1 to 7As shown, the present invention provides a three-stage continuous screening device and control system for petroleum calcined coke, including: a material box, a feeding conveyor for material conveying, a double roller crusher for material crushing, a transfer conveyor for screening, and a screening unit for multi-stage screening.

[0030] The entire equipment is supported and fixed by a support frame. Two sets of material bins are symmetrically arranged, and two feeding conveyors are installed on the sides of the two material bins that are close to each other, enabling simultaneous dual-path material feeding and effectively improving feeding efficiency. Two roller crushers are installed at the discharge ends of the two feeding conveyors, achieving integrated feeding and crushing without the need for manual material transfer. Two collection hoods are fixedly installed on the bottom of the support frame, and temporary storage boxes are fixedly installed at the bottom of the two collection hoods. After crushing, the material is collected by the collection hoods and falls into the temporary storage boxes for temporary storage, avoiding material spillage and loss. The screening conveyor connects to the temporary storage boxes and the screening unit at both ends, stably transporting the crushed material to the screening station, achieving continuous operation throughout the entire process.

[0031] The feeding conveyor includes a housing, with a fixed bracket mounted on its bottom side for stable support. Inside the housing is a conveyor bracket housing a chain conveyor belt, and a drive motor is mounted on the outside of the bracket to drive the chain conveyor belt to rotate at a uniform speed. Evenly fixed clamping plates are installed on the surface of the chain conveyor belt to effectively lift and move the material, preventing slippage. A dust cover is installed between the end of the housing and the roller crusher to seal the connection point and prevent dust leakage. During operation, the drive motor drives the chain conveyor belt, continuously conveying the petroleum calcined coke material from the material box to the roller crusher for crushing. The clamping plates improve material conveying stability, and the dust cover effectively seals the connection gap, reducing dust generation during operation.

[0032] The screening conveyor includes a second housing, inside which an internal chain conveyor is arranged to receive and continuously transport the crushed material discharged from the temporary storage box. A dust cover is installed between the output end of the second housing and the screening unit to seal and shield the screening feed position, further improving the overall sealing of the equipment, preventing dust leakage during the screening feed process, and ensuring a clean working environment.

[0033] Example 2: Based on Example 1, in order to solve the problems of easy agglomeration of petroleum calcined coke, serious dust generation during feeding, and uneven material accumulation and dispersion, this device integrates a dustproof, material shaking, spray wetting and bottom aeration pretreatment structure inside the material box to ensure smooth subsequent crushing and screening operations.

[0034] An air curtain machine is installed at the material box inlet, and a dust collection pipe is installed on the side wall of the material box. When the air curtain machine is working, it forms a ring-shaped air curtain barrier at the inlet, preventing dust from spreading outward during the feeding process. Together with the dust collection pipe, it forms a negative pressure dust collection system, suppressing dust pollution at the source. A uniform distribution plate is rotatably installed on the inner wall of the material box. Guide plates are fixedly installed on both the upper and lower sides of the uniform distribution plate to divert and guide the falling material, expand the falling range of the material, and avoid the accumulation of material. Rotating seat one and rotating seat two are fixedly installed between the material box and the uniform distribution plate, respectively. One end of rotating seat two is slidably nested inside rotating seat one. A spring is fixed on the inner wall of rotating seat one, and the end of the spring is fixedly connected to the sliding plate of rotating seat two. An externally matched vibration motor two can drive the uniform distribution plate to continuously vibrate slightly. During the vibration, rotating seat two squeezes and stretches the spring, and the elasticity and extension of the spring enhance the vibration frequency and vibration effect of the uniform distribution plate, so as to achieve uniform dispersion of the falling material.

[0035] The material bin features a spray pipe and protective netting fixedly installed on the inner wall of its top side. The spray pipes evenly spray water to moisten the material, softening any clumps and reducing powder production. The protective netting prevents large pieces of material from splashing and protects the spray pipe structure. An aeration plate is fixedly installed on the inner wall of the bottom side of the material bin. During operation, the aeration plate pumps air upwards, increasing the gaps between material particles and completely preventing the accumulation and agglomeration of petroleum calcined coke. A filter block and drain pipe are also fixedly installed at the bottom of the material bin. Excess water generated from spraying is filtered through the filter block and then drained through the drain pipe, preventing water accumulation from affecting equipment operation and fundamentally solving the problems of material agglomeration and screen clogging.

[0036] Example 3: Based on Examples 1 and 2, in order to achieve precise screening of petroleum calcined coke at three stages (large, medium, and small), screen self-cleaning, and convenient equipment maintenance, this device is equipped with a multi-stage screening and automatic unblocking and sewage discharge structure to improve screening accuracy and continuous operation capability of the equipment.

[0037] The screening unit includes a fixed frame, inside which a vibrating screen is fixedly installed. Inside the vibrating screen, screen one, screen two, and screen three are arranged sequentially from top to bottom, with the mesh size of the three screens decreasing progressively. This allows for the simultaneous screening of three different sizes of post-forged coke materials: 0-2mm, 2-25mm, and 5-25mm. Three sets of discharge pipes are installed on the outside of the fixed frame corresponding to the three screens. The screened materials of different sizes fall into the corresponding storage boxes through the discharge pipes, achieving classified storage. This ensures precise particle size screening and high operational efficiency.

[0038] The three-layer screen surface is equipped with impact balls suspended by connecting ropes. During operation, the vibrating screen continuously vibrates, causing the connecting ropes and impact balls to swing synchronously. The impact balls periodically strike the screen surface, automatically shaking off powder and impurities adhering to the screen mesh and surface, effectively preventing screen clogging. This eliminates the need for frequent manual shutdowns for cleaning, significantly increasing the equipment's continuous operating time. A vibration motor is installed at the bottom of the vibrating screen, providing stable power for the high-frequency vibration and ensuring efficient screening operations. A drain pipe is installed at the bottom of the vibrating screen, allowing for external water flushing of the screen's interior during maintenance. Residual impurities and wastewater are discharged through the drain pipe, making cleaning and maintenance convenient.

[0039] Overall equipment operation process: After the material is fed into the material box, the air curtain machine isolates the dust generated during feeding, and the dust collection pipe completes the dust collection; the shaking plate and the guide plate make the material evenly dispersed, the spray pipe wets the material, and the bottom aeration plate breaks up the lumps of material, completing the material pretreatment. The pretreated material is stably conveyed to the roller crusher for crushing by the feeding conveyor. After being collected by the collection hood and the temporary storage box, the crushed material is sent to the screening unit by the screening conveyor. Driven by the first vibrating motor, the vibrating screen drives the three-layer screen to vibrate at high frequency, completing the three-stage grading and screening. The impact ball cleans the screen blockage and impurities in real time. The qualified material is stored in the storage box through the discharge pipe. The whole process is automated and continuous, with tight process connection and excellent dust prevention and anti-clogging effect, effectively improving the production quality and efficiency of petroleum forging coke screening.

[0040] Working Principle: To obtain three specifications of petroleum calcined coke, raw materials are added to material box 1. The feed end of material box 1 is protected by air curtain machine 6 to prevent dust from leaking out. To ensure that the raw materials are evenly distributed on the bottom side of material box 1, the material is shaken by the uniform plate 601 and guided by the guide plate 602, which expands the falling range. Vibration motor 603 drives the uniform plate 601 to shake. The shaking of the uniform plate 601 is limited by rotating seat 604 and rotating seat 605 to prevent the shaking range from being too wide. To reduce dust generation, the rotating seat 605 compresses the spring 607 within the rotating seat 604 via the sliding plate 606. The extension and contraction of the spring 607 increases the vibration frequency of the equalizing plate 601. To further reduce dust, water is sprayed onto the petroleum coke using the spray pipe 609. Excess water is discharged through the filter block 611 and drain pipe 612. To prevent the petroleum coke from clumping together, gas is pumped into the bottom of the petroleum coke using the aeration plate 608. This gas increases the gaps between the petroleum coke blocks. The feeding conveyor 3 then transports the petroleum coke... The coke is transported to the roller crusher 2 for crushing. Inside the housing 301, the chain conveyor belt 305 is driven by the motor 306 to rotate, transporting the petroleum coke from the bottom of the material box 1 to the feed end of the roller crusher 2. The crushed petroleum coke is then transported through the collection hood 102, the temporary storage box 103, and the screening conveyor 4 to the screening unit 5 for screening. Driven by the vibrating motor 510, the vibrating screen 502 vibrates on the fixed frame 501, and the petroleum coke is vibrated by the screens 503, 504, and 505. The screened products are 0 to 2 mm, 2 to 25 mm, and 5 to 25 mm in size. They are then filled into the storage box 507 using three discharge pipes 506. During the vibration process, the connecting rope 508 and the impact ball 509 can remove the attached materials on the screens 503, 504, and 505 by impact. The sewage pipe 511, together with cleaning water, can remove the attached materials inside the screening unit 5. At the same time, the dust collection pipes 7, 701, and 702 can remove the dust inside the device.

[0041] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A three-stage continuous screening device and control system for petroleum calcined coke (large, medium, and small stages), characterized in that: It includes a material box (1), a double roller crusher (2), a feeding conveyor (3), a screening conveyor (4), a screening unit (5), and an integrated pretreatment mechanism; Two sets of material boxes (1) are symmetrically arranged. Two feeding conveyors (3) are respectively installed on the side of the two material boxes (1) that are close to each other. Two roller crushers (2) are respectively installed at the discharge end of the two feeding conveyors (3). The roller crushers (2) are fixedly installed on the support (101). Two collection covers (102) are fixedly installed on the bottom side of the support (101). Temporary storage boxes (103) are fixedly installed at the bottom of the two collection covers (102). The two ends of the screening conveyor (4) are respectively connected to the temporary storage box (103) and the screening unit (5), forming a continuous operation path for feeding, crushing and screening. An air curtain machine (6) is arranged at the inlet of the material box (1). A dust collection pipe (7) is also arranged on the material box (1). The integrated pretreatment mechanism is set in the material box (1) and includes an air curtain dust prevention component, a shaking material equalization component and a spray aeration anti-caking component. It is used to suppress dust overflow in the feeding process from the source, while breaking up material caking and distributing the material evenly to avoid screen blockage and ensure smooth operation of subsequent crushing and screening processes. The screening unit (5) has a built-in three-level gradient screen and screen self-cleaning component, which can screen three different particle size specifications of calcined coke products at one time, and automatically remove the powder adhering to the screen surface during the screening process, continuously maintaining screening efficiency and particle size accuracy.

2. The three-stage continuous screening device for petroleum calcined coke (large, medium, and small stages) according to claim 1, characterized in that: The feeding conveyor (3) includes a housing (301), a fixed bracket (302) is fixedly installed on the bottom side of the housing (301), a conveyor bracket (304) is provided inside the housing (301), a chain plate conveyor belt (305) is arranged inside the conveyor bracket (304), a drive for the chain plate conveyor belt (305) to rotate is arranged on the conveyor bracket (304), a clamping plate (307) is fixedly installed on the chain plate conveyor belt (305), and the end of the housing (301) is connected to the roller crusher (2) through a dust cover (303).

3. The three-stage continuous screening device for petroleum calcined coke (large, medium, and small stages) according to claim 1, characterized in that: The screening conveyor (4) includes a housing two (401), an internal chain conveyor (402) is provided inside the housing two (401), and a dust cover two (403) is installed between the output end of the housing two (401) and the screening unit (5).

4. A three-stage continuous screening device for petroleum calcined coke (large, medium, and small sizes) according to claim 1, characterized in that: The screening unit (5) includes a fixed frame (501), in which a vibrating screen (502) is fixedly installed. The inner wall of the vibrating screen (502) is provided with screen one (503), screen two (504), and screen three (505). Three discharge pipes (506) are fixedly installed on the outer side of the fixed frame (501). The three discharge pipes (506) are respectively adapted to screen one (503), screen two (504), and screen three (505). The output end of each of the three discharge pipes (506) is provided with a storage box (507).

5. A three-stage continuous screening device for petroleum post-calcination coke according to claim 4, characterized in that: Connecting ropes (508) are arranged on screen one (503), screen two (504) and screen three (505), and impact balls (509) are fixedly installed at the ends of the connecting ropes (508).

6. A three-stage continuous screening device for petroleum calcined coke (large, medium, and small sizes) according to claim 4, characterized in that: The vibrating screen (502) has a vibration motor (510) arranged on its bottom side, and a drain pipe (511) is also installed at the bottom of the vibrating screen (502).

7. A three-stage continuous screening device for petroleum calcined coke (large, medium, and small sizes) according to claim 1, characterized in that: The control terminal (107) integrates a start-up preparation control unit, a feeding and crushing control unit, a screening and output control unit, a blockage clearing and sewage discharge control unit, and an abnormal protection control unit. The start-up preparation control unit is electrically connected to the air curtain machine (6), the dust collection pipes at each level, the spray pipe (609), and the aeration plate (608) respectively, and is used to control the start-up and shutdown and operating parameters of the air curtain dust prevention system and the material pretreatment system; The feeding and crushing control unit is electrically connected to the vibration motor 2 (603), the motor (306) of the feeding conveyor (3), and the drive component of the roller crusher (2), respectively, and is used to regulate the material conveying speed and crushing operation rhythm; The screening output control unit is electrically connected to the screening conveyor (4) and the vibration motor (510) respectively, and is used to control the vibration frequency and conveying speed of the screening operation. The blockage clearing and sewage discharge control unit is electrically connected to the vibration motor (510) and the sewage discharge pipe (511) control valve respectively, and is used to control the screen self-cleaning operation and the equipment flushing and sewage discharge process; The abnormal protection control unit is electrically connected to the pipeline pressure detection element and each motor current detection module, and is used to trigger an alarm signal and perform speed reduction or shutdown protection actions when abnormal pressure or motor current is detected.

8. A three-stage continuous screening device for petroleum calcined coke (large, medium, and small sizes) according to claim 1, characterized in that: The inner wall of the material box (1) is rotatably mounted with a uniform plate (601), a guide plate (602) is fixedly mounted on the top side of the uniform plate (601), and a guide plate (602) is fixedly mounted on the bottom side of the uniform plate (601). Rotating seat one (604) and rotating seat two (605) are fixedly mounted on the material box (1) and the uniform plate (601) respectively. One end of rotating seat two (605) is slidably mounted in rotating seat one (604). A spring (607) is fixedly mounted on the inner wall of rotating seat one (604), and a sliding plate (606) is fixedly mounted on one end of rotating seat two (605). The spring (607) and the sliding plate (606) are fixedly connected.

9. A three-stage continuous screening device for petroleum calcined coke (large, medium, and small sizes) according to claim 1, characterized in that: The top inner wall of the material box (1) is fixedly equipped with a spray pipe (609) and a protective net (610), the bottom inner wall of the material box (1) is fixedly equipped with an aeration plate (608), and the bottom side of the material box (1) is also fixedly equipped with a filter block (611) and a drain pipe (612).

10. A control system for a three-stage continuous screening device (large, medium, and small) for petroleum calcined coke, as described in claims 1 to 9, specifically comprising: S1. Start-up preparation: After receiving the start-up command, the start-up preparation control unit sequentially controls the negative pressure drive components of the air curtain machine (6), dust collection pipe one (7), dust collection pipe two (701), and dust collection pipe three (702) to form an air curtain barrier at the material box (1) inlet and establish a negative pressure dust collection environment; at the same time, it controls the opening of the water supply control valve of the spray pipe (609) to spray water onto the material surface according to the set flow rate; it controls the opening of the air supply control valve of the aeration plate (608) to pump gas into the bottom of the material box (1) to complete the pre-treatment preparation before operation; S2, Feeding and Crushing: After pretreatment, the feeding and crushing control unit controls the start of the second vibration motor (603) to drive the uniform plate (601) to vibrate at a set frequency, causing the material to fall evenly; simultaneously controls the start of the motor (306) of the feeding conveyor (3) to drive the chain conveyor belt (305) to transport the material to the roller crusher (2) at a set speed; controls the start of the drive mechanism of the roller crusher (2) to continuously crush the material, and the crushed material falls into the temporary storage box (103) through the collection cover (102) for temporary storage; S3. Screening and Output: After the screening output control unit detects that the material level in the temporary storage box (103) has reached the set threshold, it controls the start of the internal chain conveyor (402) of the screening conveyor (4) to uniformly transport the material in the temporary storage box (103) to the screening unit (5); it controls the start of the vibration motor (510) to drive the vibrating screen (502) to vibrate according to the set amplitude and frequency. The material passes through the screen one (503), screen two (504), and screen three (505) in sequence to complete the three-level particle size classification screening, and obtains three specifications of finished products, which fall into the storage box (507) through the corresponding discharge pipe (506) to complete the discharge. S4. Unblocking and Sewage Discharge: During the entire screening operation, the unblocking and sewage discharge control unit controls the vibration motor (510) to vibrate continuously, causing the impact ball (509) at the end of the connecting rope (508) to repeatedly impact the screen surface with the vibration, automatically removing the powder attached to the screen and maintaining the screen's permeability; after the screening operation is completed, the flushing control valve of the sewage pipe (511) is opened to allow clean water to flush the inside of the screening unit (5), and the sewage and impurities generated during flushing are collected and discharged uniformly through the sewage pipe (511); S5. Abnormal Handling: The abnormal protection control unit collects the pressure detection signals of the dust collection pipeline and the exhaust pipeline in real time. When the pressure deviates from the set threshold, it triggers the light and sound alarm signal and sends a speed reduction command to the feeding and crushing control unit to reduce the running speed of the feeding conveyor (3). At the same time, it collects the running current signals of the first vibration motor (510) and the second vibration motor (603) in real time. When an abnormal current is detected, it immediately cuts off the power supply of the corresponding motor, performs shutdown protection and outputs fault prompt information.

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