An adjustable spacing large-diameter roller screen and control system thereof

Abstract

The application discloses a large-diameter roller screen with adjustable distance and a control system thereof, which comprises a screen frame system, a screen shaft system and a distance adjusting system. The screen frame system is provided with a guide rail, and the screen shaft system is installed on the guide rail through a sliding block. The distance adjusting system comprises a screw servo motor, which drives the screen shaft system to move along the guide rail through a ball screw, so that the distance between the screen shafts is accurately adjusted. The application is provided with a locking device composed of a screw locking nut and a hydraulic oil pump pin, which ensures reliable locking of the screen shafts and prevents displacement during operation. The control system comprises a man-machine interaction layer, a control core layer, an execution driving layer and a state feedback layer, and through a particle size-displacement conversion algorithm built in the PLC, automatic adjustment and closed-loop control of the distance between the screen shafts are realized, and the device state can be monitored in real time and automatic alarm protection can be realized. The application has high adjustment precision, reliable locking and high intelligence, and can flexibly adapt to the screening requirements of different particle size materials.

Description

Technical Field

[0001] This invention relates to the field of screening equipment technology, specifically to a large-diameter roller screen with adjustable spacing and its control system. Background Technology

[0002] Traditional roller screens have fixed screening specifications, making it impossible to flexibly adjust the screening particle size according to material characteristics. To achieve grading and screening of different particle sizes, multiple roller screens of different specifications are usually connected in series to form multiple screening sections, which has the following technical drawbacks: the screening particle size is not adjustable, and it cannot quickly adapt to changes in material particle size or operating conditions, resulting in low screening efficiency or unqualified finished product particle size; the equipment investment and land costs are high, as multi-stage screening requires multiple machines connected in parallel or in series, resulting in a large footprint and significantly increased initial procurement, installation, and subsequent maintenance costs; maintenance is inconvenient, as replacing vulnerable parts such as screen discs requires complete machine shutdown and disassembly, affecting production continuity. At the same time, the existing equipment has a low level of intelligence, and adjustment and operation often rely on manual experience, making it impossible to achieve precise and efficient automated control.

[0003] To address the problems of existing roller screens, such as limited screening specifications, inconvenient adjustment, and high equipment investment and maintenance costs, this invention proposes a large-diameter roller screen with adjustable spacing and its control system. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides the following technical solution: a large-particle-size roller screen with adjustable spacing and its control system, comprising a screen frame system, a screen shaft system, and a spacing adjustment system. The screen frame system includes a screen support frame, with a housing mounted on top. A screw motor mounting plate is detachably connected to the bottom outer side of the housing. A guide rail is provided on the screen support frame. The screen shaft system includes a slider mounted on the guide rail, allowing the entire screen shaft system to move smoothly along the guide rail. The spacing adjustment system includes a screw servo motor mounted on the screw motor mounting plate. A screen shaft spacing adjustment plate is mounted on the slider, connecting to the drive components of the spacing adjustment system, thereby driving the screen shaft system to move on the guide rail and achieving precise adjustment of the screen shaft spacing.

[0005] Furthermore, the screen shaft system also includes a motor, the output end of which is connected to the screen shaft via a coupling. Multiple screen disc assemblies are mounted on the screen shaft at regular intervals. One end of the screen shaft is connected to a first bearing housing, and the other end is connected to a second bearing housing. Both the first and second bearing housings are detachably mounted on the slider. This structure makes each screen shaft an independent, movable module, facilitating maintenance and replacement.

[0006] Furthermore, the screen plate assembly includes multiple screen plates, and a cutting bushing is installed between two adjacent screen plates to form a precise screen gap between the screen plates. A bushing is installed between two screen plate assemblies to ensure the spacing between adjacent screen plate assemblies, thereby ensuring uniform particle size distribution across the entire screen shaft.

[0007] Furthermore, the adjustment system also includes a ball screw, the output end of which is connected to the ball screw servo motor. The other end of the ball screw is mounted on a ball screw bearing housing, which is detachably mounted on the screen shaft system (e.g., via a screen shaft adjustment plate). Using a ball screw and servo motor enables high-precision linear displacement, ensuring the accuracy of screen shaft spacing adjustment.

[0008] Furthermore, the aforementioned adjustable-gap large-diameter roller screen and its control system also include a locking device. The locking device comprises a lead screw locking nut and a hydraulic pump pin, the hydraulic pump pin being mounted on the slider. After the screen shaft system is adjusted to its proper position, the locking device provides double mechanical locking, effectively preventing screen shaft displacement due to vibration or impact during operation and ensuring the stability of screening accuracy.

[0009] Furthermore, the edges of the screen plate are configured as either arc-shaped or serrated. Different screen plate shapes can be selected to suit the characteristics of different materials. Arc-shaped screen plates facilitate material passage, while serrated screen plates can crush and tumble the material, improving screening efficiency.

[0010] Furthermore, the top of the housing is equipped with an inspection door, which allows operators to enter the housing to inspect, maintain, and replace components such as the screen shaft and screen disc, thus improving the maintainability of the equipment.

[0011] Furthermore, the aforementioned adjustable-gap large-diameter roller screen and its control system also include a reserved compensation structure, which includes a reserved compensation guide rail and a spare screen shaft system. When a wider adjustment range is required or when existing screen shafts need repair or replacement, the reserved compensation structure can be used to quickly add or replace screen shafts, improving the equipment's scalability and fault tolerance.

[0012] Furthermore, the aforementioned adjustable-gap large-particle-size roller screen and its control system further include a control system comprising:

[0013] The human-machine interaction layer includes a touch screen, control panel buttons, and control panel indicator lights, which are used to input the target screening particle size, operating parameters, and display the equipment status.

[0014] The control core layer includes a main controller PLC, which has a built-in particle size-displacement conversion algorithm to convert the input target screening particle size into the target displacement of the screen shaft system in real time and output control commands.

[0015] An execution drive layer, comprising a servo drive system and an auxiliary frequency converter drive system, wherein the servo drive system receives commands from the control core layer and drives the lead screw servo motor to operate, and the auxiliary frequency converter drive system receives commands from the control core layer and drives the slide bed frequency converter to adjust the speed of the chain device; and

[0016] The status feedback layer includes a lead screw position sensor, a screen shaft speed sensor, a detection switch, and a hydraulic cylinder position detection element, which are used to collect screen shaft position, speed and hydraulic cylinder status signals in real time and feed them back to the control core layer.

[0017] The control core layer compares the feedback signal from the state feedback layer with the target instruction and makes real-time corrections to the execution drive layer to form a closed-loop control.

[0018] Accordingly, the present invention also provides a control method for an adjustable-gap roller screen, comprising the following steps:

[0019] Step S1: Command Input and Conversion. The target screening particle size is input through the human-machine interface layer. The main controller PLC calls the built-in particle size-displacement conversion algorithm to convert the target screening particle size into the target displacement of the screen shaft system in real time.

[0020] Step S2: Position Adjustment and Closed-Loop Control. The main controller PLC outputs direction commands and pulse signals to the servo drive system according to the target displacement, driving the lead screw servo motor to rotate, which in turn drives the screen shaft system to move along the guide rail via the ball screw. At the same time, the lead screw position sensor in the status feedback layer collects the actual position of the screen shaft system in real time and feeds it back to the main controller PLC. The main controller PLC compares the feedback value with the target displacement. If there is a deviation, it corrects the output command in real time until the screen shaft system accurately reaches the target position.

[0021] Step S3: Position Locking. After the screen shaft system is in place, the main controller PLC controls the hydraulic cylinder mechanism to move, driving the hydraulic oil pump pin to insert into the positioning hole of the slider, and simultaneously controlling the screw locking nut to lock, thus completing the mechanical locking;

[0022] Step S4: Screening Operation and Linkage Control. The main controller PLC sends a start command to the motor, driving the screen shaft to rotate for screening. At the same time, the main controller PLC outputs commands to the auxiliary frequency conversion drive system according to the preset process parameters, adjusting the running speed of the chain device through the slide bed frequency converter to achieve matching between the screening speed and the conveying speed.

[0023] Step S5: Real-time monitoring and safety protection. During the screening process, the status feedback layer collects the screen shaft speed, hydraulic cylinder status, and limit position switch signals in real time and feeds them back to the main controller PLC. The main controller PLC analyzes and judges the collected data. When it detects an over-limit, jamming, or emergency stop signal, it immediately cuts off the output of the execution drive layer and triggers an alarm, while displaying fault information on the touch screen.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] By implementing a pitch adjustment system driven by a lead screw servo motor, the problems of fixed screen shaft spacing, inflexible adjustment based on material particle size, and limited applicability of existing roller screens are solved. This achieves automatic and precise adjustment of the screen shaft spacing, enabling the equipment to adapt to the screening needs of materials with different particle sizes. A locking device consisting of a lead screw locking nut and a hydraulic pump pin solves the problem of lead screw loosening and screen shaft displacement caused by equipment vibration after the screen shaft is adjusted, thus affecting screening accuracy. This securely locks the screen shaft in the working position, improving equipment stability and safety. An inspection door on the top of the housing solves the problems of inconvenient maintenance of internal components and the need for extensive disassembly, allowing operators to quickly access the housing for inspection and maintenance, reducing downtime. A closed-loop control system consisting of a PLC, particle size-displacement conversion algorithm, servo drive system, and position sensors enables automatic adjustment of the screen shaft spacing. After the operator inputs the target particle size, the system automatically completes the entire process from command conversion and precise displacement to position locking. Meanwhile, the system integrates multiple status feedback sensors, which can monitor the equipment's operating status in real time, automatically shut down for protection when an abnormality is detected, and display fault information on the touch screen, thereby improving the maintainability of the equipment. Attached Figure Description

[0026] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0027] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0028] Figure 2 For the present invention Figure 1 A magnified view of a portion of point A in the middle;

[0029] Figure 3 This is a schematic diagram of the overall side view structure of the present invention;

[0030] Figure 4 This is a schematic diagram of the sieve shaft system of the present invention.

[0031] In the diagram: 1. Screen frame system; 11. Screening machine support; 12. Housing; 13. Screw motor fixing plate; 14. Guide rail; 15. Screen shaft adjustment plate; 16. Inspection door; 2. Screen shaft system; 21. Slider; 22. Motor; 23. Coupling; 24. Screen shaft; 25. Screen plate assembly; 251. Screen plate; 252. Cutting bushing; 253. Bushing; 26. First bearing seat; 27. Second bearing seat; 3. Adjustment system; 31. Screw servo motor; 32. Ball screw; 33. Ball screw bearing seat; 4. Locking device; 41. Screw locking nut; 42. Hydraulic oil pump pin; 5. Reserved compensation structure; 51. Reserved compensation guide rail; 52. Spare screen shaft system. Detailed Implementation

[0032] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] like Figure 1-4 As shown, this embodiment of a large-particle-size roller screen with adjustable spacing and its control system includes a screen frame system 1, a screen shaft system 2, and a spacing adjustment system 3. The screen frame system 1 includes a screen support 11, a housing 12 is mounted on the top of the screen support 11, and a lead screw motor fixing plate 13 is detachably connected to the bottom of the outer side of the housing 12. A guide rail 14 is provided on the screen support 11. The screen shaft system 2 includes a slider 21, which is mounted on the guide rail 14. The spacing adjustment system 3 includes a lead screw servo motor 31, which is mounted on the lead screw motor fixing plate 13. A screen shaft spacing adjustment plate 15 is mounted on the slider 21.

[0034] The screen shaft system 2 also includes a motor 22. The output end of the motor 22 is connected to the screen shaft 24 via a coupling 23. Multiple screen disc assemblies 25 are installed on the screen shaft 24 at certain intervals. One end of the screen shaft 24 is connected to the first bearing seat 26, and the other end is connected to the second bearing seat 27. Both the first bearing seat 26 and the second bearing seat 27 can be detachably installed on the slider 21, realizing the modular integration of the screen shaft system 2, which facilitates overall disassembly and maintenance.

[0035] The screen plate assembly 25 includes multiple screen plates 251. A cutting bushing 252 is installed between two adjacent screen plates 251, and a bushing 253 is installed between two screen plate assemblies 25 to facilitate axial position adjustment and assist in cutting materials.

[0036] The pitch adjustment system 3 also includes a ball screw 32. The output end of the screw servo motor 31 is connected to the ball screw 32. The other end of the ball screw 32 is mounted on the ball screw bearing seat 33. The ball screw bearing seat 33 is detachably mounted on the screen shaft system 2.

[0037] It also includes a locking device 4, which includes a screw locking nut 41 and a hydraulic oil pump pin 42. The hydraulic oil pump pin 42 is installed on the slider 21 to ensure the stability of the screen shaft spacing during the screening process.

[0038] The edges of the sieve plate 251 are set in an arc shape or a tooth shape, which can enhance the efficiency of material turning, conveying and screening.

[0039] The top of the housing 12 is equipped with an inspection door 16, which facilitates inspection and internal maintenance, while preventing dust from spilling out.

[0040] It also includes a reserved compensation structure 5, which includes a reserved compensation guide rail 51 and a spare screen shaft system 52. One or more spare screen shaft installation positions are reserved inside the screen frame along the material conveying direction. When the spacing of the screen shafts 24 is adjusted to a smaller value, resulting in a shortening of the total length, the spare screen shafts can be quickly put into place to fill the gap caused by the reduced spacing. They are fixed by a locking device to effectively prevent material leakage and ensure the continuity of screening.

[0041] This embodiment also includes an advanced industrial control system for automating and intelligently operating the aforementioned mechanical structure. The system includes:

[0042] Human-machine interface layer: Consists of a touch screen, control panel buttons, and indicator lights. Operators can input the target screening particle size, set operating parameters, and monitor the equipment's operating status in real time via the touch screen.

[0043] Control core layer: The core is a programmable logic controller (PLC). The PLC has a built-in "particle size-displacement" algorithm. When the gap decreases (the target particle size becomes smaller), the speed of motor 22 is automatically increased to speed up the material conveying and avoid accumulation and blockage in narrow gaps.

[0044] When the spacing increases (the target particle size becomes larger), the motor speed is automatically reduced by 22 to extend the residence time of the material on the screen surface, ensuring that large particles are fully screened and improving the grading accuracy.

[0045] The execution drive layer includes a servo drive system and an auxiliary variable frequency drive system. The servo drive system receives instructions from the PLC and precisely controls the rotation angle and speed of the lead screw servo motor 31, thereby driving the pitch adjustment system 3 to work. The auxiliary variable frequency drive system is used to control the frequency converters of conveying equipment such as slide beds, realizing the linkage matching between screening speed and material conveying speed.

[0046] Status feedback layer: This layer consists of various sensors, such as a screw position sensor mounted on the ball screw 32 or screen shaft system 2, a speed sensor for monitoring the rotational speed of the screen shaft 24, a detection switch for detecting the position of the hydraulic pump pin 42, and limit switches. These sensors collect the equipment's status information in real time and feed it back to the PLC.

[0047] Based on the above control system, the roller screen in this embodiment implements an intelligent control method, which mainly includes the following steps:

[0048] S1: Command Input and Conversion. The operator inputs the required screening particle size on the touch screen, and the PLC calculates the target displacement that each screen shaft system 2 needs to move based on the built-in algorithm.

[0049] S2: Position Adjustment and Closed-Loop Control. The PLC sends pulse and direction commands to the servo driver, driving the lead screw servo motor 31 to rotate, which in turn moves the screen shaft system 2 via the ball screw 32. Simultaneously, the lead screw position sensor continuously feeds back the actual displacement to the PLC. The PLC compares the feedback value with the target value, and if a deviation is detected, it immediately corrects the output command, forming precise closed-loop control until the screen shaft system 2 precisely reaches the target position.

[0050] S3: Position Locking. After the screen shaft is in position, the PLC first controls the screw locking nut 41 to lock the ball screw 32. Subsequently, the PLC controls the hydraulic system to drive the hydraulic oil pump pin 42 to insert into the corresponding positioning hole, completing the double mechanical locking.

[0051] S4: Screening Operation and Linkage Control. After locking, the PLC starts the screen shaft motor 22, driving the screen shaft 24 to rotate and begin the screening operation. At the same time, the PLC sends instructions to the frequency converters of conveying equipment such as slides according to the preset process parameters, automatically adjusting their operating speed to ensure that the material conveying speed matches the screening speed, achieving optimal processing efficiency.

[0052] S5: Real-time monitoring and safety protection. During equipment operation, all sensors work continuously, feeding back signals such as screen shaft speed, hydraulic cylinder status, and whether the equipment exceeds limits to the PLC in real time. The PLC analyzes this data in real time, and once it detects fault signals such as screen shaft jamming, abnormal speed, overload, or someone pressing the emergency stop button, it will immediately cut off the output of the execution drive layer, the equipment will stop urgently, and an audible and visual alarm will be triggered. At the same time, the fault type and location will be clearly displayed on the touch screen to guide maintenance personnel to quickly troubleshoot.

[0053] The working principle of this invention is:

[0054] When the screening particle size needs to be changed, the pitch adjustment system 3 is activated, the lead screw servo motor 31 is energized and operates, outputting torque. The lead screw servo motor 31 drives the ball screw 32 to rotate, and the rotational motion of the ball screw 32 is converted into the linear motion of its nut. Since the nut of the ball screw 32 is fixedly connected to the first bearing seat 26 through the ball screw bearing seat 33, and both the first bearing seat 26 and the second bearing seat 27 are mounted on the slider 21, and the slider 21 is in sliding engagement with the guide rail 14, the linear motion of the nut directly drives the entire screen shaft system 2 (including...). The motor 22, screen shaft 24, screen plate assembly 25, bearing seat and slider move smoothly along the guide rail 14. By controlling the number of rotations and direction of the lead screw servo motor 31, the center distance between adjacent screen shafts 24 is precisely changed to adapt to the passage requirements of materials with different particle sizes. After adjustment, the locking device 4 intervenes, and the hydraulic oil pump pin 42 extends and inserts into the positioning hole to lock the slider 21 onto the guide rail 14. At the same time, the lead screw locking nut 41 locks the ball screw 32 to prevent it from reversing and loosening, ensuring that the screen shaft system 2 maintains a constant position during operation.

[0055] After the gap is adjusted and locked, the equipment enters the screening operation state. The motor 22 starts and transmits torque to the screen shaft 24 through the coupling 23, driving the screen shaft 24 to rotate around its axis. Multiple screen shafts 24 rotate synchronously in the same direction, driving the screen disc assembly 25 installed on them to rotate. The material enters the box 12 from the feed end and falls on the rotating screen disc assembly 25. The screen plate 251 rotates with the screen shaft, generating a throwing and forward conveying force on the material. The material moves forward along the screen surface. During the movement, material particles with a diameter smaller than the gap between the screen shafts pass through the adjacent screens under their own weight and the action of the screen plate. The material falling through the gap between the shafts 24 is discharged to the bottom of the box 12, becoming the undersize. Material with a particle size larger than the gap is held by the screen plate 251 and continues to be conveyed forward to the discharge end, becoming the oversize. During the rotation of the screen shaft 24, the arc-shaped or toothed structure on the edge of the screen plate 251 cuts and peels off the material stuck in the gap, forcing it to pass through or fall off. The cutting bushing 252 installed between the screen plates 251 and the bushing 253 installed between the screen plate assemblies 25 also play an auxiliary role in stirring and cleaning when rotating with the screen shaft, preventing sticky materials from clogging the screen gap.

[0056] When maintenance is required, the operator can open the inspection door 16 on the top of the housing 12 to directly observe the wear condition of the screen plate assembly 25 inside the housing. Since the first bearing seat 26, the second bearing seat 27 and the slider 21 are detachably connected, the screen shaft 24 that needs to be replaced can be lifted out as a whole, which is convenient for offline maintenance.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0058] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large-particle-size roller screen with adjustable spacing and its control system, characterized in that, The system includes a screen frame system (1), a screen shaft system (2), and a spacing adjustment system (3). The screen frame system (1) includes a screen machine support (11), a box (12) is installed on the top of the screen machine support (11), and a screw motor fixing plate (13) is detachably connected to the bottom of the outer side of the box (12). A guide rail (14) is provided on the screen machine support (11). The screen shaft system (2) includes a slider (21), which is installed on the guide rail (14). The spacing adjustment system (3) includes a screw servo motor (31), which is installed on the screw motor fixing plate (13). A screen shaft spacing adjustment plate (15) is installed on the slider (21).

2. The adjustable-gap large-particle-size roller screen and its control system according to claim 1, characterized in that: The screen shaft system (2) also includes a motor (22), the output end of which is connected to the screen shaft (24) via a coupling (23). Multiple screen disc assemblies (25) are installed on the screen shaft (24) at certain intervals. One end of the screen shaft (24) is connected to a first bearing seat (26), and the other end is connected to a second bearing seat (27). Both the first bearing seat (26) and the second bearing seat (27) can be detachably installed on the slider (21).

3. The adjustable-gap large-particle-size roller screen and its control system according to claim 2, characterized in that: The screen assembly (25) includes a plurality of screen plates (251), a cutting bushing (252) is installed between two adjacent screen plates (251), and a bushing (253) is installed between two screen assemblies (25).

4. The adjustable-gap large-particle-size roller screen and its control system according to claim 1, characterized in that: The pitch adjustment system (3) also includes a ball screw (32), the output end of the screw servo motor (31) is connected to the ball screw (32), the other end of the ball screw (32) is mounted on the ball screw bearing seat (33), and the ball screw bearing seat (33) is detachably mounted on the screen shaft system (2).

5. The adjustable-gap large-particle-size roller screen and its control system according to claim 1, characterized in that: It also includes a locking device (4), which includes a screw locking nut (41) and a hydraulic pump pin (42), which is mounted on the slider (21).

6. The adjustable-gap large-particle-size roller screen and its control system according to claim 3, characterized in that: The edge of the sieve plate (251) is set in an arc shape or a tooth shape.

7. The adjustable-gap large-particle-size roller screen and its control system according to claim 1, characterized in that: The top of the housing (12) is provided with an inspection door (16).

8. The adjustable-gap large-particle-size roller screen and its control system according to claim 1, characterized in that: It also includes a reserved compensation structure (5), which includes a reserved compensation guide rail (51) and a spare screen shaft system (52).

9. The adjustable-gap large-particle-size roller screen and its control system according to claim 1, characterized in that: It also includes a control system, which includes: The human-machine interaction layer includes a touch screen, control panel buttons, and control panel indicator lights, which are used to input the target screening particle size, operating parameters, and display the equipment status. The control core layer includes a main controller PLC, which has a particle size-displacement conversion algorithm embedded in it. This algorithm is used to convert the input target screening particle size into the target displacement of the screen shaft system (2) in real time and output control commands. The execution drive layer includes a servo drive system and an auxiliary frequency converter drive system. The servo drive system receives instructions from the control core layer and drives the lead screw servo motor (31) to operate. The auxiliary frequency converter drive system receives instructions from the control core layer and drives the slide bed frequency converter to adjust the speed of the chain device. The status feedback layer includes a screw position sensor, a screen shaft speed sensor, a detection switch and a hydraulic cylinder position detection element, which are used to collect the position, speed and hydraulic cylinder status signals of the screen shaft (24) in real time and feed them back to the control core layer. The control core layer compares the feedback signal from the state feedback layer with the target instruction and makes real-time corrections to the execution drive layer to form a closed-loop control.

10. A control method for an adjustable-gap roller screen, characterized in that, Includes the following steps: Step S1: Command Input and Conversion The target screening particle size is input through the human-machine interaction layer, and the main controller PLC calls the built-in particle size-displacement conversion algorithm to convert the target screening particle size into the target displacement of the screen shaft system (2) in real time. Step S2: Position Adjustment and Closed-Loop Control The main controller PLC outputs direction commands and pulse signals to the servo drive system according to the target displacement, driving the lead screw servo motor (31) to run, and driving the screen shaft system (2) to move along the guide rail (14) through the ball screw (32); at the same time, the lead screw position sensor of the status feedback layer collects the actual position of the screen shaft system (2) in real time and feeds it back to the main controller PLC. The main controller PLC compares the feedback value with the target displacement. If there is a deviation, it corrects the output command in real time until the screen shaft system (2) accurately reaches the target position. Step S3: Position Locking After the screen shaft system (2) is in place, the main controller PLC controls the hydraulic cylinder mechanism to move, drives the hydraulic oil pump pin (42) to insert into the positioning hole of the slider (21), and at the same time controls the screw locking nut (41) to lock, thus completing the mechanical locking; Step S4: Screening Operation and Linkage Control The main controller PLC sends a start command to the motor (22) to drive the screen shaft (24) to rotate for screening. At the same time, the main controller PLC outputs commands to the auxiliary frequency conversion drive system according to the preset process parameters, and adjusts the running speed of the chain device through the slide bed frequency converter to achieve the matching of screening speed and conveying speed. Step S5: Real-time monitoring and security protection During the screening process, the status feedback layer collects the rotation speed of the screen shaft (24), the status of the hydraulic cylinder, and the limit position switch signal in real time and feeds them back to the main controller PLC. The main controller PLC analyzes and judges the collected data. When it detects an over-limit, jam, or emergency stop signal, it immediately cuts off the output of the execution drive layer and triggers an alarm, while displaying fault information on the touch screen.

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