Rock breaking ability of high hardness rock layers:
With a working pressure of 22-32 MPa and specially designed cutting teeth, effective cutting can be formed for f6-f10 hardness rock layers (such as sandy shale and medium hard coal seams), and the cutting efficiency is increased by 30% compared to traditional oil cylinders;
The cylinder barrel is made of 27SiMn alloy forgings and quenched (hardness HRC45-50), which can withstand an instantaneous impact load of 2000KN when cutting hard rock. It is equipped with an adjustable buffer valve (buffer stroke 30-80mm) to reduce the damage of cutting vibration to the oil cylinder.
Corrosion resistant design for dust environment:
The sealing system adopts a dual lip polyurethane+metal skeleton structure, combined with a cylinder head spiral dust ring (dust protection level IP68), which can block more than 99% of coal dust intrusion and maintain sealing performance in environments with dust concentration ≥ 1500mg/m ³;
The surface of the piston rod is chemically plated with nickel phosphorus alloy (thickness 0.05-0.1mm, hardness ≥ HV700), which has twice the wear and corrosion resistance compared to traditional chrome plating, and is suitable for wet and dusty underground conditions.
Explosion proof safety and precise control:
The entire series has passed MA coal mine safety certification, and the surface of the oil cylinder has been sprayed with anti-static coating (surface resistance ≤ 1 × 10 ⁹ Ω). The hydraulic system uses flame-retardant hydraulic oil to eliminate the risk of sparks;
Integrated magnetostrictive displacement sensor (accuracy ± 0.2mm), combined with electro-hydraulic proportional valve to achieve millimeter level control of cutting depth, cutting section error ≤ 20mm, ensuring the quality of tunnel forming.
Long lifespan and low maintenance design:
Adopting self-lubricating guide sleeve (including solid lubricant embedding structure), the lubrication cycle is extended to 16 hours, reducing the frequency of shutdown maintenance;
Under 12 hours of continuous operation every day, the lifespan is ≥ 60000 cycles (usable for 1.5-2 years), and the inner wall of the cylinder is polished (surface roughness Ra ≤ 0.4 μ m) to reduce the risk of hydraulic oil contamination.
Compact anti eccentric load structure:
Adopting a short stroke high thrust design, the installation space is reduced by 35% compared to the same parameter oil cylinder, which is suitable for the compact layout of the cutting arm of the anchor excavator;
The ratio of rod diameter to cylinder diameter has been optimized to 0.5:1, and with the help of anti eccentric load guide sleeve, it can withstand eccentric load angles within 2.5 ° (equivalent to 150KN eccentric load), avoiding bending and deformation of the oil cylinder during cutting.
