Wear-Resistant Round-Shank Cutting Picks for Underground Coal Mining Machinery

Overview

Designed for the extreme conditions of underground coal mining, the Wear-Resistant Round-Shank Cutting Picks deliver superior abrasion resistance and structural integrity in soft to medium-hard coal seams (uniaxial compressive strength ≤60MPa, including interbedded shale up to 80MPa). Featuring a PDC-reinforced tungsten carbide tip and a corrosion-resistant chrome-molybdenum shank (ø22mm/ø24mm), these picks excel in continuous miners, roadheaders, and longwall shearers, ensuring reliable performance in gassy (CH4 ≤1.5%), wet (relative humidity ≥90%), and high-dust environments.

Features

Dual-Material Construction:

PDC-Reinforced Cutting Tip: Combines a WC-Co substrate (10% Co, 89.5HRA) with a 3mm-thick polycrystalline diamond compact layer (Vickers hardness 7,000 HV), providing 50% longer wear life than standard carbide picks when cutting coal with ≥15% pyrite content. The PDC layer resists adhesive wear from sticky coal (moisture content ≥12%).

High-Strength Shank: Austenitic heat-treated 30CrMnTi steel (45-48HRC) with a circular cross-section (surface roughness Ra≤1.6μm) optimizes torque transfer, reducing rotational resistance by 30% in cohesive coal (plasticity index ≥20) and minimizing energy consumption by 18%.

Advanced Coating Systems:

CVD Diamond Film Coating: A 10μm-thick diamond layer (ASTM D3363 tested) on the cutting edge lowers the friction coefficient to 0.12, preventing coal adhesion and reducing cutting force by 15% in high-moisture seams (water content ≥8%).

Zn-Ni Alloy Plating: The shank is coated with a 25μm-thick Zn-Ni layer (ASTM B766 Type II), offering excellent resistance to hydrogen sulfide (H2S) corrosion—maintaining 95% shank integrity after 1,000 hours in H2S concentrations up to 1,000ppm.

Ergonomic & Dynamic Design:

Curved Cutting Edge: A 5mm-radius edge profile (compared to standard 3mm) reduces the required cutting force by 20% at 1,500 N/mm² pressure, enabling smoother penetration into coal-rock interfaces (e.g., 30mm-thick shale interlayers).

Balanced Mass Distribution: Engineered to have a centroidal offset ≤0.5g·cm, minimizing vibrational stress on machine arms during high-frequency cutting (200 strokes/min), which reduces arm fatigue by 25% over 12-hour shifts.

Application

Longwall Shearing Operations:

Efficiently cuts through 2.5m-thick primary coal seams at a speed of 1.5m/s, maintaining tip wear ≤0.3mm/day even in gassy conditions (methane concentration 1.2%). The PDC tip resists glazing in low-ash coal (ash content ≤10%).

Roadheader Excavation:

Profiles mine roadways in semi-hard coal (50MPa UCS) with interbedded sandstone (90MPa UCS), achieving a advance rate of 15m/day while minimizing tip breakage—critical for maintaining production schedules in thin-seam mining (seam thickness 1.2-2.0m).

Continuous Mining in Gassy Seams:

Operates safely in environments with methane concentrations up to 1.5%, thanks to the anti-static shank design that prevents sparking during contact with pyrite-rich coal (sulfur content ≥2%).

Why Choose Us

Geological Adaptability: Available in four tip angles (15°, 20°, 25°, 30°) to match coal hardness: 15° for soft coal (≤30MPa), 30° for semi-hard coal (50-60MPa). Free geological analysis service helps select the optimal tip angle based on your seam's Vickers hardness (HV 20-60).

Rigorous Certification & Testing:

Compliant with MT/T 246-2011 (Chinese coal mining standard), passing impact resistance tests (25J) and bending strength tests (850MPa).

Each batch is tested in simulated mine conditions (50°C, 95% RH, 1,000ppm H2S) to ensure consistent performance.

Inventory & Cost Management:

Customizable packaging options (20-piece boxes for small mines, 100-piece bulk kits for large enterprises) with barcode tracking compatible with SAP and Oracle inventory systems, reducing stock discrepancies by 20%.

Engineered to have a 30% lower total cost of ownership than competing picks, driven by reduced replacement frequency and extended shank life (200 hours in harsh conditions).

The size of road milling machine pick teeth