Crawler Belt Mucking Machine

Crawler belt slag scraper (also known as crawler belt slag loader, ZWY crawler-type excavating loader), is the main equipment for continuous slag discharge underground in mines and tunnels. It integrates crawler walking, hydraulic excavating and loading, continuous belt conveying and discharging, with efficiency much higher than that of traditional electric scraper winches. The following provides a thorough explanation from the aspects of core definition, structure, working principle, efficiency, model selection and comparison with electric scrapers:

I. Core Definition and Essence

Crawler belt mucking machine = crawler walking chassis + hydraulic backhoe loading arm + belt conveyor. It advances via crawlers, uses a hydraulic bucket to scoop up slag, directly feeds it onto the onboard belt, and continuously conveys it to the rear for discharge into mine cars or transfer machines, achieving uninterrupted continuous slag removal and replacing the electric scraper's "reciprocating scraping + manual assistance" mode.

II. Core Structure (Five Major Systems)

Walking System: Crawler chassis (steel crawlers driven by hydraulic motors and reducers), featuring low ground pressure and strong grip. It adapts to muddy, waterlogged and steep roadways, with a climbing capacity of 15°~25° (electric scrapers are generally ≤8°), and enables in-situ steering and flexible movement.

Loading System: Hydraulic backhoe arm (boom, arm and bucket), controlled by a pilot valve, capable of lifting, rotating and telescoping. It performs full-section slag removal without dead corners, can conduct risk removal, bottom cleaning and ditch excavation, and is suitable for large ore crushing (a crushing hammer can be installed optionally).

Conveying System: Belt conveyor (flame-retardant and wear-resistant belt with a width of 500~800mm), driven by an electric/hydraulic drum, featuring continuous and uniform conveying, no slag jamming and high efficiency, differing from scraper conveying (prone to large block jamming and severe wear).

Power and Hydraulic System: Mainly electric-hydraulic type (explosion-proof motor + hydraulic pump, safe for underground use with no exhaust gas); diesel or dual-power configurations are also available. The hydraulic system is equipped with pilot control, overload protection and air cooling, ensuring stable movements and easy operation.

Control and Frame: Compact frame with single-person operation (pilot joystick), equipped with emergency braking and limit protection. The machine body is narrow (1.5~1.8m), suitable for small-section roadways of 2.4m×2.4m and above.

# III. Working Flow (Continuous Mucking, No Idle Stroke) 1. The crawler travels forward to the tunnel face; the hydraulic grab bucket descends and penetrates the ore pile. 2. The grab bucket closes, the arm lifts, and dumps muck into the belt inlet on the machine body. 3. The conveyor belt runs continuously, transporting muck from the head to the tail of the machine. 4. Muck is directly discharged from the tail into mine cars, shuttle cars, or downstream belt conveyors. 5. The excavating arm repeats loading cycles; the crawler advances with the tunnel face. The whole process is continuous, non-returning, and non-stop. # IV. Core Efficiency (Great Advantages Over Scraper Haulers) - **Rated Loading Capacity**: Main models include ZWY‑60 (60 m³/h), ZWY‑80 (80 m³/h), ZWY‑120 (120 m³/h). Actual on-site efficiency: 40–100 m³/h (loose ore and rock), equivalent to 80–200 t/h (density 2.5–2.7 t/m³). - **Comparison with Scraper Haulers**: Scrapers only achieve 20–50 t/h, with reciprocating motion, high idle‑stroke ratio, and poor adaptability to large rocks. Crawler belt mucking machines deliver **2–4 times higher efficiency**, with continuous operation, fewer workers (only 1 operator), short cycle time, and effective working rate ≥85%. - **Efficiency Factors**: Optimal rock size ≤500 mm (large rocks require crushing); stable efficiency at gradients ≤18°, declining above 20°; built‑in conveying eliminates long‑distance hauling; operator proficiency. # V. Main Models & Key Parameters (Common Versions) - **ZWY‑60T**: Loading rate 60 m³/h, motor 22 kW, belt width 600 mm, climbing capacity ≤18°, weight approx. 4 t, suitable for 2.4×2.4 m roadways. - **ZWY‑80T**: Loading rate 80 m³/h, motor 30 kW, belt width 650–700 mm, climbing capacity ≤20°, weight approx. 6–7 t, suitable for 2.8×2.8 m roadways. - **ZWY‑120T**: Loading rate 120 m³/h, motor 45–55 kW, belt width 800 mm, climbing capacity ≤25°, weight approx. 8–10 t, suitable for roadways ≥3.0×3.0 m. # VI. Core Advantages vs Scraper Winches - **Higher Efficiency**: Continuous conveying with no idle stroke; 2–4 times the efficiency of scrapers; tunneling cycle time reduced by over 30%. - **Stronger Adaptability**: Crawler chassis works in mud, waterlogging, and steep gradients; excavating arm cleans dead corners, removes hazards, and breaks large rocks. Scrapers are limited to flat roadways, vulnerable to large rocks, and prone to jamming. - **Safety & Labor**: Single‑person operation away from the tunnel face, reducing risks of roof fall and dust exposure. Scrapers require multiple workers and carry high risks of wire rope breakage. - **Maintenance & Cost**: Easy belt replacement and low failure rate. Scrapers suffer high wear on wire ropes, pulleys, and tail sheaves, with frequent downtime. # VII. Applicable Scenarios - Continuous mucking for metal mines, coal mine rock roadways, semi‑coal‑rock roadways, water diversion tunnels, railway/highway tunnels, and national defense caverns. - Suitable for roadways with cross‑section ≥2.4×2.4 m, gradient ≤25°, and rock size ≤500 mm. - **Not applicable**: Ultra‑small cross‑sections (<2.2 m), oversized rocks (>600 mm without crushing), long‑distance single‑head scraper hauling (scrapers remain advantageous).