DYFSS Series Four-shaft Shredder

Thanks to the four-shaft design (two main shafts + two counter/sizing shafts), the DYFSS achieves controlled output sizing without over-grinding. Common applications include:

E-waste recycling – Shredding circuit boards, hard drives, lithium batteries (with safety modifications), and mixed electronic components. Low rotor speed minimizes sparks and dust.

Plastics & rubber – Large injection-molded parts, thick-wall pipes, plastic drums, and car tires (without steel or with steel cord when using appropriate wear parts).

Wood & biomass – Pallet waste, demolition wood, and landscaping waste. Optional VFD enables soft start for heavy wood.

Metal processing – Aluminum profiles, light-gauge steel, copper radiators, and engine blocks (pre-shredding stage).

Waste-to-energy – MSW, RDF, and industrial waste – the four-shaft action produces uniform flakes ideal for downstream sorting equipment.

Real-world case – A German recycling plant uses a DYFSS-100  120 to process post-consumer HDPE drums at 3–5 t/h. The 40 mm blade thickness and Φ320 cutters handle thick walls without clogging; 31 blades per shaft produce ideal 20–50 mm flakes for a washing line.

Real-world case – A Canadian tire recycler replaced a two-shaft shredder with a DYFSS-130  140. The four-shaft design reduced "snake strips" (uncut strands) from 18% to 3%. Blade life increased by 40% because the counter shafts protect the main blades from over-sized material.

Every DYFSS shredder undergoes a four-stage QC process before leaving our factory. We follow ISO 9001:2015 procedures.

Stage 1 – Raw material & component inspection

Blade steel – Each blade blank is hardness tested (standard HRC 48–52, hardened option up to HRC 58) and chemically verified (Cr-Mo-V alloy).

Gearboxes and motors – 2-hour no-load run-in; oil temperature, vibration, and unusual noise checked (noise limit <75 dB at 1 m).

 Stage 2 – In-process inspection

Shaft concentricity ≤0.05 mm per meter of length.

Blade slot positioning tolerance ±0.1 mm to ensure perfect meshing.

Crushing chamber wall thickness verified with ultrasonic thickness gauge – no weak points.

Stage 3 – Pre-assembly & idle running

Trial assembly of shafts; measure blade clearance (target 0.5–1.5 mm depending on model). All fasteners torqued to specification and torque-seal marked.

Stage 4 – Load test with real materials

Standard test – 500 kg of mixed waste (25% heavy HDPE, 25% aluminum profiles, 25% soft copper, 25% pine wood). Machine must run continuously for 4 hours with gearbox temperature rise ≤60°C.

Destructive sample – For DYFSS-100  120 and larger, we run a 1-ton batch of solid steel drums (1 mm thick) to verify motor current stays below 90% of rated current.

Output analysis – Screen the shredded material; at least 95% must pass through a 50 mm screen (or according to customer specification).

Real-world case – Before shipping a DYFSS-9080 to an e-waste recycler in Spain, we ran 800 kg of mixed PCBs with aluminum heat sinks. After the test, we checked every blade edge – wear was less than 0.2 mm. The customer received a signed load test report with video.

Q1: How often do I need to rotate or replace blades?
A: Blade life depends on material abrasiveness. For general MSW or plastics, expect 800–1,200 hours before rotating blades. For abrasive materials like nylon 66 or glass fiber, rotate every 400 hours. All four shafts are indexable, so you can use the opposite cutting edge. Replacement blades for the DYFSS series are in stock and can be shipped within 72 hours.

Q2: Can I change the output particle size?
A: Yes. The lower two shafts act as a sizing comb. By changing the lower blades with different tooth profiles (standard, fine, or coarse), you can achieve output sizes from 10 mm to 80 mm. No need to change an entire screen – a major advantage over single-shaft or two-shaft designs.

Q3: What happens if a foreign object (hard metal) enters the crushing chamber?
A: The PLC controller continuously monitors the current of each motor. If torque on any shaft suddenly exceeds 130% of rated torque, the machine automatically reverses for 2 seconds, then tries forward again. After three failed attempts, an alarm is triggered and the machine stops completely. In our tests, 16 mm mild steel bars are ejected without damaging the machine. For harder objects (e.g., broken hammer heads), shear pins on the couplings break – each pin costs $12 and is designed to protect the gearbox.

Q4: How much floor space do I need?

Add an extra 1.5 m on the feed side for a conveyor or hopper.

Q5: Do you offer spare parts kits?
A: Yes. We offer a recommended starter spare parts kit covering 2,000 operating hours, which includes: 12 spare blades (3 per shaft), 2 sets of shear pins, 1 set of shaft seals, 2 gearbox oil filters, and 1 set of crushing chamber wear plates. The kit saves approx. 25% compared to buying parts individually.

Q6: Can I shred wet material (e.g., wet MSW)?
A: Yes, with one caveat: the output may become slightly compacted. We add an optional anti-bridging pusher and enlarge the discharge chute. Some customers in Southeast Asia shred wet kitchen waste mixed with plastics – even at 40% moisture, the four-shaft design pushes the material through.

Q7: What is typical energy consumption

DYFSS-9080 – shredding medium plastics (20 mm output): 22–28 kWh/t

DYFSS-100120 – 20–26 kWh/t (more efficient due to larger bite)

DYFSS-130140 – processing bulky waste: 18–24 kWh/t

These figures come from actual field operating records – lower than most two-shaft machines because the four-shaft design reduces idle recirculation.