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Asphalt HRA Milled Material Double-Roller Stripping and Screening Device
1. Equipment Overview
This equipment is a professional stripping and screening device specifically designed for processing reclaimed asphalt pavement (HRA) material. Its main function is to strip the lump materials generated after asphalt pavement milling, providing properly sized raw materials for subsequent screening and production of recycled asphalt mixtures. It is one of the key pieces of equipment for achieving asphalt pavement material recycling.
2. Equipment Features
Specialized Double-Roller Stripping and Screening Principle
Equipped with two counter-rotating wear-resistant toothed rollers, stripping is primarily accomplished through shearing and squeezing of the HRA material rather than high-speed impact. This method better preserves the original gradation and integrity of the aggregates.
Flexible Protection Design
The stripping rollers feature a floating or spring-tensioned design, allowing them to automatically retract when encountering oversized or non-strippable materials, thus preventing equipment jamming and effectively protecting core components.
Excellent Wear Resistance
Key contact components such as the toothed rollers are manufactured from special high-hardness wear-resistant alloy materials, specifically designed for the highly abrasive nature of asphalt materials, ensuring long service life.
Flexibly Adjustable Output Particle Size
The gap between the two rollers can be conveniently and precisely adjusted via hydraulic or mechanical means, allowing control over the particle size of the final stripped output to meet the requirements of different recycled mix designs.
I. Core Technical Advantages
1. Professionally Targeted Design
Principle Optimized for HRA: Specifically developed for the characteristics of reclaimed asphalt pavement (HRA), adopting a double-roller flexible stripping principle. Stripping of lump milled material is achieved through shearing and squeezing action rather than high-speed impact.
Core Value: Maximally preserves the original gradation and integrity of aggregates, making it a key factor in producing high-quality recycled asphalt mixtures.
2. Excellent Wear Resistance and Anti-Clogging Performance
Wear Resistance Guarantee: Core components such as the toothed rollers and wear plates are manufactured from high-hardness wear-resistant alloy materials, ensuring long service life.
Anti-Sticking and Anti-Clogging Design:
Stripping Rollers: Employ staggered wear-resistant tooth plates, effectively preventing asphalt material adhesion.
Screening System: Equipped with high-frequency vibrating screen mesh and anti-clogging screen technology, fundamentally solving the industry problem of fine aggregate adhering to the screen mesh, ensuring continuous and stable production.
3. Intelligent Protection and High Reliability
Flexible Overload Protection: The stripping rollers feature a floating design or are equipped with spring tensioning devices. When encountering oversized or non-strippable materials, they automatically retract and reset, effectively preventing equipment jamming or damage and protecting core components.
Modular Robust Structure: The entire production line features a clear equipment layout, with core units (such as the stripping machine and screening machine) built with robust structures for stable operation and low failure rates.
II. Economic and Practical Advantages
1. High Output and Flexibility
Flexible Configuration: The production line can be modularly configured based on output requirements (50-150 t/h) and number of finished product types (2 or 3 types).
Controllable Particle Size: The output particle size of the core stripping machine can be easily controlled by adjusting the roller gap, readily meeting different recycled mix design requirements.
2. Energy Saving and Environmental Protection
Dust Suppression at Source: Utilizes a low-speed stripping principle, reducing dust generation at the source.
High Efficiency and Energy Saving: Main power equipment (motors, reducers) are selected from high-efficiency, energy-saving models.
The conveying system adopts variable frequency speed control, allowing speed adjustment according to demand and avoiding idle operation energy consumption.
3. Low Operation and Maintenance Costs
Convenient Maintenance: Wear parts (such as stripping teeth and screen meshes) adopt standardized and modular designs for quick and easy replacement, minimizing downtime.
Intelligent Control: Equipped with an integrated electrical control system (such as GE300 type), featuring step-down starting, centralized control, and interlocked start/stop. Simple operation effectively protects motors and reduces labor costs and electrical failure risks.
III. User-Friendly Advantages
1. Simple Installation and Easy Adaptation
Complete Foundation: Provides comprehensive steel structure foundation design, including maintenance access, guardrails, and safety ladders, ensuring fast and safe onsite installation.
Smooth Integration: Mature equipment layout ensures seamless integration with upstream and downstream equipment (such as feeders and conveyors), offering high system integration.
2. High Cost-Effectiveness
Transparent Solution: Clear and transparent configuration list (e.g., sample solution: total price RMB 366,500 for 100-150 t/h three-finished-product solution).
Diverse Options: Offers a variety of solutions ranging from single units to complete production lines to meet different budgets and production needs, with a clear return on investment.
I. Core Equipment: Operating Principle of HRA Double-Toothed Roller Stripping and Screening Equipment
This is the “heart” of the entire system, and its operating principle is fundamentally different from traditional impact crushers.
Feeding and Engagement: Asphalt milled material (HRA) is uniformly fed between two parallel toothed rollers by the feeding equipment.
Counter-Rotation and Shearing/Squeezing: The two toothed rollers rotate counter-directionally under power drive. The material is engaged by the rotating toothed rollers and drawn into the stripping chamber.
Flexible Stripping: This is the key point. The roller shafts are not completely rigidly fixed but are designed with a floating clearance or spring buffer device. When encountering oversized or non-strippable hard objects, the roller shafts can temporarily retract, increasing the clearance to discharge the foreign material, and then automatically reset. This prevents equipment jamming or damage, achieving “over-iron protection.”
Particle Size Control: The final particle size of the stripped output is primarily determined by the gap between the two toothed rollers (roll spacing). By adjusting the roll spacing, the maximum output particle size can be controlled to meet the requirements of different recycled asphalt mixtures for HRA aggregate gradation.
Gradation Protection: Since stripping is mainly achieved through low-speed shearing and squeezing rather than high-speed impact, secondary damage to the virgin aggregates is effectively reduced, and the particle size and gradation of the original stones in the asphalt milled material are preserved to the greatest extent. This is crucial for ensuring the quality of the recycled material.
II. Full Stripping and Screening Production Line Workflow
This is a complete system, and its operating principle follows a “stripping – screening – classification” closed-loop or open-loop cycle.
Pre-treatment and Uniform Feeding: A vibrating motor and adjustable gate at the bottom of the storage bin ensure that materials are fed into the system uniformly and controllably, preventing clogging.
Core Stripping: The material is stripped to the preset particle size in the double-toothed roller stripping machine according to the principle described above.
Precise Screening and Classification: The stripped mixture passes through a multi-layer vibrating screen, where it is precisely separated into finished products of different specifications (e.g., 0-5mm, 5-10mm, 10-15mm).
Closed-Loop Circulation: Oversized particles (return material) from screening are automatically returned via a return conveyor to the stripping and screening machine for further processing, forming a closed-loop cycle. This ensures that all materials ultimately become qualified products while improving system efficiency.
Finished Product Output: Qualified finished products of different specifications are transported via their respective finished product conveyors to different stockpiles or storage bins, awaiting use in the asphalt recycling plant.
Summary: The essence of the working principle of this equipment lies in “using gentleness to overcome hardness” and “precise classification.”
“Gentleness” is reflected in the stripping machine’s flexible overload protection and low-speed shearing method, protecting both the equipment and the aggregate gradation.
“Precision” is reflected in the combination of adjustable roll spacing and multi-layer vibrating screens, achieving precise control over the final product particle size.
This enables the production line to efficiently handle sticky and compositionally complex asphalt milled material while producing high-quality recycled aggregates, making it an ideal technical solution for asphalt pavement recycling.
| No. | Equipment Name | Model / Specification | Qty | Power (kW) | Remarks |
|---|---|---|---|---|---|
| 1 | Storage Bin | 3.5×2.8×1.7m | 1 | 0.35 | Above-ground type, with grating |
| 2 | Feeding Conveyor | B800×3m | 1 | 3 | Variable frequency speed control |
| 3 | Main Conveyor | B800×16.5m | 1 | 7.5 | Variable frequency speed control |
| 4 | Return Conveyor | B650×9m | 1 | 4 | – |
| 5 | Double-Toothed Roller Stripping Machine | 600×750 Type | 1 | 22×2 | Tooth type optional |
| 6 | Vibrating Screen | 3YK1548 | 1 | 15 | Three decks, screen surface 1500×4800mm |
| 7 | Finished Product Conveyor | B650×10m | 3 | 4×3 | – |
| 8 | Steel Structure Base for Vibrating Screen | 200×200 H-Beam | 1 Set | – | Including discharge chute and hopper |
| 9 | Steel Structure Base for Stripping Machine | 150H-Beam | 1 Set | – | Including discharge hopper |
| 10 | Electrical Control System | GE300 Type | 1 Set | 100 | Step-down start, 380V/50Hz |
| No. | Equipment Name | Model / Specification | Qty | Power (kW) | Remarks |
|---|---|---|---|---|---|
| 1 | Storage Bin | 3.5×2.8×1.7m | 1 | 0.37 | Above-ground type |
| 2 | Main Conveyor | B650×16.5m | 1 | 7.5 | Variable frequency speed control |
| 3 | Return Conveyor | B500×10m | 1 | 4 | – |
| 4 | Double-Toothed Roller Stripping Machine | 2PGC450×500 | 1 | 11×2 | V-belt drive |
| 5 | Vibrating Screen | 2YK1236 | 1 | 5.5 | Two decks, screen surface 1200×3600mm |
| 6 | Finished Product Conveyor | B500×10m | 3 | 4×3 | – |
| 7 | Steel Structure Base for Vibrating Screen | 200H-Beam | 1 Set | – | Including discharge chute and hopper |
| 8 | Steel Structure Base for Stripping Machine | 150H-Beam | 1 Set | – | Including discharge hopper |
| 9 | Electrical Control System | GE300 Type | 1 Set | 60 | Step-down start, 380V |
