The MSTD670 Mobile Shredder is a heavy‑duty, dual‑shaft hydraulic‑drive mobile pre‑shredder, typically mounted on a tracked or wheeled chassis. It serves as the primary size‑reduction stage in a mobile scrap metal recycling line—tearing down bulky end‑of‑life vehicles (ELVs), appliances, and mixed scrap into manageable pieces before finer crushing and sorting.
1. MSTD670 Core Specifications & Features
• Drive & Power: Hydraulic motor + reducer transmission powered by a diesel engine / diesel‑electric hybrid; includes a large‑capacity diesel tank for extended off‑grid operation. Hydraulic drive provides low‑speed, high‑torque shearing with overload protection and auto‑reverse on jamming.
- Shredding Mechanism: Dual‑shaft cutter rollers with wear‑resistant alloy blades; can be rotated/replaced when worn. Thickened high‑strength manganese steel frame handles thousands of Nm torque for heavy‑duty scrap.
- Feeding: Large open‑top hopper with hydraulic‑adjustable angle; accepts direct loading by grab bucket, excavator, or loader. Whole car bodies or large shells can be fed without prior dismantling (only fluids/batteries typically removed).
- Mobility: Integrated on tracked or tire‑mounted chassis → self‑propelled or towable. No fixed foundation needed; deploy directly at scrapyards, demolition sites, or salvage yards.
- Control System: PLC‑based auto control with manual/auto modes, emergency stop, overload reversal, and remote monitoring options.
- Throughput Context: Positioned above the smaller MSTD320; MSTD670 offers higher horsepower, larger intake, and greater tonnage capacity, suitable for medium‑to‑large scale mobile operations (typical mobile lines process ~10–30 t/h of car bodies depending on configuration).
2. Applicable Scrap Metal Materials:
Ferrous Metals: End‑of‑life vehicle shells/frames, scrap sheet metal, steel bars, drums, demolition steel structures, machinery housings
Non‑ferrous Metals: Aluminum profiles/cans/castings/wheel hubs, copper sheets, enameled wire, radiators, zinc scrap
Composite / Mixed White goods: fridges, washers, AC units, motor housings, cables, car shells with glass/rubber/plastic attachments
Other Bulk Waste: Tires, wood, mixed construction debris (for volume reduction prior to separation)
The MSTD670 handles irregular, bulky items directly—no pre‑cutting or gas‑cutting required—producing 50–150 mm pre‑shredded fragments ideal for downstream processing.
3. Complete Mobile Scrap Metal Recycling Line Configuration
A typical mobile recycling line centered on MSTD670 follows a 3‑stage modular flow:
Stage 1 – Pre‑Shredding (MSTD670)
• Input: Grab/excavator loads whole car bodies, appliances, or loose scrap into the hopper.
- Action: Dual‑shaft cutters shear/tear material into coarse chunks (~50–200 mm).
• Output: Pre‑shredded mix discharged onto belt conveyor → to secondary crusher.
- Benefit: Volume reduction of 70–90%, breaks cavities, liberates trapped non‑metallics, eliminates need for stationary pre‑processing.
Stage 2 – Fine Crushing / Secondary Size Reduction
• Equipment: Mobile metal hammer crusher / shredder (e.g., scrap steel crusher) mounted on separate mobile unit.
- Process: High‑speed rotor with hammers impacts/pre‑shreds material → further size reduction (typically <50 mm), kneading/compacting to strip paint, insulation, and adhered plastics.
- Screening: Undersize passes through screen; oversize recirculated or re‑fed.
Stage 3 – Separation & Sorting
Conveyor transfers crushed mix to integrated sorting modules (often on one or more mobile chassis):
1. Magnetic Separation (overhead drum magnet or cross‑belt): Extracts ferrous steel/iron → clean ferrous pile (purity >95%).
2. Eddy Current Separator (ECS): Repels non‑ferrous metals (Al, Cu, brass) into separate stream; remaining tailings = plastics, rubber, foam ("fluff").
3. Air Classifier / Trommel Screen (optional): Removes light fractions (film, dust) and sizes material further.
4. Dust Suppression System: Water spray/mist to control airborne particles during crushing & sorting.
Final Outputs:
• Ferrous scrap (shredded steel) → sold to steel mills/EAFs
• Non‑ferrous fraction (Al, Cu mix) → further sorted or sold to smelters
• Non‑metallic residue → landfill, energy recovery, or alternative recycling
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