Intelligent Combined Grain Seeds Beans Cleaning Machine Working? Full-Process Working Principle, Special Design, Intelligent Control, and 30t/h High-Capacity Application

Abstract

1. Introduction

2. Core Overview of the PLC-Controlled Intelligent Combined Cleaning Machine

• Special Design: Adopting a modular integrated structure with a reasonable layout, high structural rigidity, low noise (≤75dB), and easy maintenance. The quick-release screen design and independent impurity discharge channels are the core of its special design, ensuring convenience and cleaning efficiency.
• Intelligent Control: Equipped with an industrial-grade PLC controller and Siemens HMI touch screen, realizing fully automatic operation, real-time parameter monitoring, fault self-diagnosis, program storage, and one-key switching between automatic and manual modes. This reduces human error and labor costs while improving operation stability.
• Siemens Screen: Adopts a high-quality Siemens touch screen (model optional: KTP700 Basic, KTP900 Basic) with dust-proof, anti-interference, and fast response performance, providing an intuitive human-machine interaction interface for parameter setting and operation monitoring.
• 30t/h Large Capacity: Optimized structural design (large effective screen area, high-power energy-saving motor, smooth material flow channel) ensures stable processing capacity of 25–30t/h, supporting 24-hour continuous operation to meet large-scale production needs.
• Multi-Material Adaptability: By replacing different specifications of sieves (aperture range: 0.5–20mm), one machine can clean various grains, seeds, and beans—including wheat (sieve aperture: 2.5–3.0mm), corn (4.0–5.0mm), soybean (5.0–6.0mm), rice (2.0–2.5mm), rapeseeds (1.5–2.0mm), and more—without additional modifications, greatly improving equipment versatility.
• Multi-Impurity Removal: Equipped with 6 independent functional parts, each targeting a specific type of impurity, ensuring thorough impurity removal without secondary mixing. This targeted design is the key to achieving high cleaning precision.

3. Special Structural Design: The Foundation of Efficiency and Versatility

3.1 Integrated Modular Structure

1. Feeding and Uniform Distribution Module: Equipped with a large-capacity feeding hopper (volume: 0.8–1.0m³) and a frequency-controlled feeder, controlled by the PLC system to ensure uniform and stable feeding—avoiding material accumulation or insufficient feeding, which is the prerequisite for stable 30t/h processing capacity.
2. Pre-Cleaning and Large Impurity Removal Module: Equipped with a coarse sieve (aperture: 10–20mm) to remove large impurities such as straw, clods, branches, and stones (diameter >5mm) at the first step, preventing damage to subsequent components and ensuring smooth operation.
3. Air Cleaning and Light Impurity Removal Module: Includes a variable-frequency fan (power: 7.5–11kW) and a dust collection system, using aerodynamic principles to separate light impurities from materials.
4. Multi-Layer Vibrating Screening Module: The core of material classification, equipped with 2–4 layers of sieves (replaceable) with different apertures, completing the separation of qualified materials, small impurities, and broken grains.
5. Specific Gravity Separation Module: Used for fine cleaning, separating empty, moldy, and damaged grains from full grains based on differences in specific gravity.
6. Impurity Collection and Discharge Module: Equipped with 5 independent impurity outlets, ensuring that different impurities are discharged separately without secondary mixing.
7. Dust Removal Module: Adopts a pulse dust collector (filter area: 20–30m²) to collect dust and light impurities, meeting environmental protection standards (emission concentration ≤30mg/m³).
8. PLC Control and Siemens Screen Module: Integrates the PLC controller and Siemens touch screen, installed in a dust-proof control cabinet, ensuring stable operation in harsh on-site environments.

3.2 Quick-Release Screen Design (Key for Multi-Material Adaptability)

• Fixing Method: Sieves are fixed with elastic clamps and locking handles, no wrenches or screws required—reducing screen replacement time from 30 minutes (traditional machines) to 5–10 minutes.
• Screen Specifications: A variety of sieve apertures are available (0.5–20mm), and the screen material is high-strength stainless steel (304) or carbon steel, with anti-blocking and anti-adhesion treatment—extending service life and reducing clogging during high-capacity operation.
• Compatibility: The screen frame is standardized, ensuring that different specifications of sieves can be installed without modifying the machine—improving versatility and reducing user replacement costs.

3.3 Independent Impurity Discharge Channels (Key for Multi-Impurity Removal)

1. Large Impurity Outlet: Connected to the pre-cleaning module, discharging straw, clods, branches, and stones.
2. Light Impurity Outlet: Connected to the air cleaning module, discharging chaff, dust, husk, and shriveled seeds (collected by the dust removal system).
3. Small Impurity Outlet: Connected to the lower layer of the vibrating screen, discharging sand, soil, broken grains, and small weed seeds (particle size < qualified materials).
4. Defective Grain Outlet: Connected to the specific gravity separation module, discharging moldy, damaged, empty, and non-full grains.
5. Weed Seed Outlet: Connected to the middle layer of the vibrating screen, discharging weed seeds with similar particle size to qualified materials but different specific gravity.
6. Finished Product Outlet: Discharging high-cleanliness qualified grains and seeds, connected to a conveyor belt or packaging machine for subsequent processing.

3.4 Durable Body Design (Ensuring Long-Term High-Capacity Operation)

• Frame: Made of high-quality carbon steel (Q235B) or stainless steel (304), welded by robot arm—ensuring high rigidity, no deformation during long-term high-load operation, and service life of ≥10 years.
• Vibrating Screen: The screen frame is reinforced with thickened steel plates, and the vibrating motor is a high-power energy-saving type (power: 4–7.5kW) with a service life of ≥5 years, supporting high-frequency vibration (1450–2900r/min) to improve screening efficiency.
• Air Duct: Designed with a smooth inner wall (no dead corners) to reduce wind resistance, improve air flow efficiency, and avoid material accumulation—ensuring stable air volume during 30t/h operation.

4. Intelligent System: PLC Control + Siemens Screen (Core of Automation)

4.1 Composition of the Intelligent Control System

1. Main Controller (PLC): Adopts industrial-grade PLC (model optional: Siemens S7-1200, Mitsubishi FX series), with high stability, anti-interference ability, and fast response speed. It can process 1000+ I/O signals, supporting real-time control of feeding, vibration, air volume, and discharge—ensuring coordinated operation of all modules and stable 30t/h capacity.
2. Human-Machine Interface (HMI): Equipped with a Siemens touch screen (model: KTP700 Basic / KTP900 Basic), with a 7-inch / 9-inch color display, dust-proof and waterproof grade IP65—suitable for harsh on-site environments (dust, humidity) in grain processing plants. The screen supports Chinese, English, and other multi-language display, facilitating operation by users of different nationalities.
3. Sensors: Equipped with 8+ high-precision sensors to collect real-time operating data:
   1. Material level sensor: Monitor the material level in the feeding hopper, automatically adjust feeding speed to avoid overflow or insufficient feeding.
   2. Vibration sensor: Monitor the vibration amplitude and frequency of the vibrating screen, alarm in case of abnormality.
   3. Wind pressure sensor: Monitor the air pressure in the air duct, automatically adjust fan speed to ensure stable air volume.
   4. Current / voltage sensor: Monitor the operating status of motors, alarm in case of overload, overcurrent, or phase loss.
   5. Temperature sensor: Monitor the temperature of the motor and control cabinet, avoid overheating damage.
4. Actuators: Including frequency-controlled (VFD) fans, vibrating motors, feeding motors, electric control valves, and dust collection motors—all controlled by the PLC system to realize precise adjustment of parameters.
5. Protection System: Integrated overload protection, overcurrent protection, phase loss protection, material blockage protection, and fault alarm functions—automatically stop feeding and issue an alarm when a fault occurs, avoiding equipment damage and grain loss.

4.2 Key Functions of the Siemens Screen (User-Friendly Operation)

1. Parameter Setting and Adjustment: Users can manually set or automatically adjust key parameters such as feeding speed (0–30t/h), fan air volume (0–100%), vibration amplitude (0–5mm), vibration frequency (1450–2900r/min), and screening time. The parameters are displayed numerically and graphically, making it easy to observe and adjust.
2. Real-Time Monitoring: The screen displays the real-time operating status of the machine, including processing capacity (t/h), motor current/voltage, wind pressure, material level, and fault information. Users can grasp the operation status at a glance, reducing the need for on-site inspection.
3. Program Storage and Call: Supports storage of 50+ parameter formulas for different materials (wheat, corn, soybean, rice, etc.). When changing materials, users only need to call the corresponding formula with one key—avoiding repeated parameter setting and improving production efficiency. For example, the "soybean cleaning formula" has preset feeding speed, air volume, and vibration parameters, which can be called immediately after screen replacement.
4. Fault Self-Diagnosis and Alarm: The PLC system automatically detects faults such as motor overload, material blockage, abnormal air volume, screen damage, and phase loss—displaying the fault location, cause, and solution on the Siemens screen. At the same time, an audible and visual alarm is issued to remind users to handle it in time. For example, if the feeding hopper is blocked, the screen will display "feeding blockage" and suggest "reduce feeding speed, check the feeder", helping users quickly solve the problem.
5. Automatic / Manual Mode Switch: Supports two operation modes. In automatic mode, the machine runs fully according to preset parameters—suitable for normal production. In manual mode, users can manually control each module (feeding, fan, vibrating screen) separately—suitable for debugging, maintenance, and emergency handling.
6. Data Recording and Statistics: Automatically records operating data such as running time, total processing capacity, fault history, and cleaning efficiency—facilitating production management and data analysis for enterprises. The data can be exported via USB (optional) for long-term storage.

4.3 PLC Automatic Control Logic (Ensuring Stable 30t/h Operation)

1. Start Sequence Control: To avoid equipment damage caused by improper start-up, the PLC controls the start sequence: dust collection motor → fan → vibrating screen → feeder. Each module starts with a 3–5 second delay, ensuring that the machine enters a stable state step by step.
2. Automatic Parameter Adjustment: The PLC collects real-time data from various sensors and automatically adjusts parameters to optimize the cleaning effect and maintain 30t/h capacity. For example:
   1. If the material level sensor detects that the feeding hopper is full, the PLC increases the feeding speed; if it is insufficient, it reduces the feeding speed.
   2. If the wind pressure sensor detects that the air volume is too low (affecting light impurity removal), the PLC increases the fan speed; if it is too high (causing grain loss), it reduces the fan speed.
   3. If the vibration sensor detects abnormal vibration, the PLC reduces the vibration amplitude and issues an alarm.
3. Stop Sequence Control: To avoid material residue and equipment damage, the PLC controls the stop sequence: feeder → vibrating screen → fan → dust collection motor. The feeder stops first, and the other modules continue to run for 5–10 minutes to clean the remaining materials—ensuring no residue and reducing maintenance workload.
4. Fault Handling Logic: When a fault is detected (e.g., motor overload, material blockage), the PLC immediately stops the feeder (to avoid continuous feeding), issues an audible and visual alarm, and displays the fault information on the Siemens screen. After the fault is resolved, users can reset the system and restart the machine—avoiding further damage.
5. Continuous Operation Guarantee: The PLC system adopts a redundant design, ensuring that even if one sensor fails, the machine can continue to run at a stable speed (reducing capacity slightly) instead of stopping—maximizing production efficiency. This is crucial for large-scale enterprises that need 24-hour continuous operation.

5. Working Process: How the Machine Completes Cleaning Automatically?

Step 1: Uniform Feeding (Foundation of 30t/h Capacity)

Step 2: Pre-Cleaning (Large Impurity Removal)

Step 3: Air Cleaning (Light Impurity Removal)

Step 4: Multi-Layer Vibrating Screening (Material Classification + Small Impurity Removal)

• Upper Layer (Coarse Sieve): Retains small large impurities (particle size slightly larger than qualified materials) that were not removed in the pre-cleaning step, and discharges them through the large impurity outlet.
• Middle Layer (Qualified Sieve): Retains qualified materials (particle size meets the standard), which fall into the specific gravity separation module for fine cleaning.
• Lower Layer (Fine Sieve): Allows small impurities (sand, soil, broken grains, small weed seeds, particle size < qualified materials) to pass through, and discharges them through the small impurity outlet.

Step 5: Specific Gravity Separation (Fine Cleaning + Defective Grain Removal)

Step 6: Multi-Channel Impurity Discharge (Avoid Secondary Mixing)

Step 7: Finished Product Discharge (End of Cleaning Process)

6. 30t/h Large Capacity Design: How to Achieve Stable High Efficiency?

6.1 Key Design Points for 30t/h Capacity

1. Large Effective Screen Area: The multi-layer vibrating screen has a large effective screen area (≥3.0m²), which increases the contact area between materials and the screen—improving screening efficiency. Compared with traditional machines (effective screen area ≤2.0m²), the processing capacity is increased by 50%.
2. High-Power Energy-Saving Motors: Equipped with high-power motors for the feeder, vibrating screen, and fan: All motors adopt energy-saving designs (level 2 energy efficiency), reducing energy consumption by 15–20% compared with traditional motors—lowering production costs for users.
   1. Feeder motor: Power 2.2–3kW, frequency-controlled, supporting stable feeding at 30t/h.
   2. Vibrating motor: Power 4–7.5kW, high torque, supporting high-frequency vibration to avoid material accumulation.
   3. Fan motor: Power 7.5–11kW, variable-frequency, providing sufficient air volume for light impurity removal during high-capacity operation.
3. Optimized Material Flow Channel: The material flow channel (from feeding hopper to finished product outlet) is designed with a smooth inner wall and reasonable inclination angle (30–45°)—avoiding material blockage and ensuring smooth material flow. The cross-sectional area of the channel is enlarged (≥0.2m²) to adapt to high-capacity material flow.
4. High-Speed Feeding System: The feeder adopts a spiral feeding design, with a large feeding capacity (0–35t/h adjustable)—ensuring that materials can enter the machine stably at 30t/h. The frequency-controlled design allows flexible adjustment according to the processing needs.
5. PLC Intelligent Coordination: The PLC system coordinates the operation of all modules to avoid bottlenecks in any link. For example, if the vibrating screen is overloaded, the PLC reduces the feeding speed temporarily; if the fan air volume is insufficient, the PLC increases the fan speed—ensuring that the entire system operates at full load stably.

6.2 Capacity Stability and Performance Indicators

• Processing Capacity: 25–30t/h (adjustable), stable for 24-hour continuous operation. The actual capacity varies slightly according to the material type and impurity content (e.g., 30t/h for wheat, 28t/h for soybean, 25t/h for rapeseeds).
• Cleanliness Rate: ≥98% (after cleaning, the impurity content of finished products is ≤2%), meeting national grain and seed cleaning standards (GB 1353-2009 for wheat, GB 1352-2009 for soybean).
• Grain Loss Rate: ≤1% (the loss of full grains during cleaning is less than 1%), reducing grain waste.
• Operation Stability: The failure rate is ≤0.5% per 1000 hours of operation, ensuring long-term stable production.
• Noise: ≤75dB, meeting occupational health standards (GBZ/T 189.8-2007), improving the working environment of operators.

6.3 Balance Between Capacity and Cleaning Quality

• PLC Automatic Optimization: The PLC collects real-time data from sensors and automatically adjusts parameters (feeding speed, air volume, vibration frequency) to balance capacity and cleaning quality. For example, if the impurity content of raw materials is high, the PLC reduces the feeding speed slightly and increases the air volume and vibration amplitude—ensuring thorough impurity removal while maintaining high capacity.
• Multi-Stage Impurity Removal: The 6 independent functional modules perform impurity removal in stages, ensuring that each type of impurity is thoroughly removed—avoiding the need to sacrifice cleaning quality for capacity.
• High-Precision Sieves and Sensors: The use of high-precision sieves (aperture error ≤0.1mm) and sensors (measurement error ≤1%) ensures that the separation accuracy is not affected by high-capacity operation.

7. Multi-Material Adaptability: One Machine for Multiple Uses (Key Advantage)

7.1 Applicable Materials (Comprehensive Versatility)

7.2 Quick Material Change Process (Simple and Efficient)

1. Stop the Machine: Press the "Stop" button on the Siemens screen, and the machine will stop according to the preset stop sequence (feeder → vibrating screen → fan → dust collection motor).
2. Open the Screen Compartment: Open the door of the vibrating screen compartment (equipped with a safety lock to ensure operator safety).
3. Replace the Sieve: Loosen the elastic clamps and locking handles, take out the old sieve, and install the new sieve (corresponding to the target material). Tighten the clamps and handles to ensure the sieve is fixed firmly (no looseness during vibration).
4. Close the Compartment: Close the screen compartment door and lock the safety lock.
5. Call Parameter Formula: On the Siemens screen, enter the "Parameter Formula" interface, select the formula corresponding to the target material (e.g., "soybean cleaning formula"), and click "Call".
6. Restart Production: Press the "Start" button on the Siemens screen, and the machine will start according to the preset start sequence—entering normal production with the new material parameters.

7.3 Practical Application Scenario (Enhancing EEAT)

8. Multi-Impurity Removal: Targeted Cleaning by Different Functional Parts

8.1 Classification of Impurities in Grains and Seeds

1. Large Impurities: Particle size larger than qualified materials, such as straw, clods, branches, stones, and large weed stems.
2. Light Impurities: Specific gravity smaller than qualified materials, such as dust, chaff, husk, shriveled seeds, and broken husks.
3. Small Impurities: Particle size smaller than qualified materials, such as sand, soil, broken grains, and small weed seeds.
4. Defective Grains: Empty, moldy, damaged, and non-full grains—particle size similar to qualified materials but different specific gravity.
5. Weed Seeds: Particle size similar to qualified materials, such as barnyard grass seeds, crabgrass seeds—difficult to separate by screening alone.
6. Metallic Impurities: Iron nails, iron chips, etc.—easily overlooked but harmful to subsequent processing equipment (optional magnetic separation module).

8.2 Targeted Impurity Removal by Different Functional Parts

9. Advantages Summary and Practical Application Value