CR800UG

⛏️ CR800UG 800m Underground Electric Full-Hydraulic Core Drill Rig

The CR800UG is an electric full-hydraulic core drill rig designed for underground mine tunnels, drill sites, and confined spaces. The equipment adopts a modular structure, allowing the power unit, feed mechanism, drill base frame, oil tank, and control unit to be transported separately and then assembled at the underground drill site. It is suitable for tunnels, crosscuts, drifts, and mining area drill sites where large surface drill rigs cannot directly enter.

🚇 Underground Tunnels Are the Core Operating Environment for This Equipment

Underground mine spaces are limited by tunnel width, height, turning radius, and transportation methods. The equipment must not only have drilling capability but also accommodate transport and on-site layout. The CR800UG's split modules can be delivered to the working point in batches via inclined shafts, cages, mine cars, or tunnel transport systems, reducing space constraints caused by large complete machines entering the site.

⚡ Electric Motor Power Is More Suitable for Enclosed or Semi-Enclosed Underground Operations

The power system uses a 22 kW × 3 or 30 kW × 2 motor configuration, with a main system flow rate of 200 L/min and pressure of 210 bar. Compared to diesel power, electric motors do not produce combustion exhaust at the drill site, making them more suitable for underground mines with a stable power supply. The electrical scheme should be confirmed based on mine voltage, frequency, cable length, and starting method during actual configuration.

⬇️ NQ Reference Drilling Depth of 800m at 90° Conditions

Under 90° reference conditions, the BQ reference drilling depth is 920 m, NQ is 800 m, and HQ is 380 m. This direction is suitable for verifying ore body extension, deep faults, surrounding rock changes, and potential replacement resources from the current mining level to deeper levels.

➡️ Horizontal Holes Are More Suitable for Direct Ore Body Control from Tunnels

Under 0° reference conditions, the BQ reference drilling depth is 600 m, NQ is 400 m, and HQ is 200 m. Horizontal holes can be drilled directly from crosscuts or haulage tunnels to the side, used to determine ore body thickness, surrounding rock boundaries, fault displacement, and mineralization continuity, reducing a large number of ineffective hole sections drilled from the surface.

⬆️ Upward Holes Are Suitable for Verifying Upper Ore Bodies and Roof Direction

Under -90° reference conditions, the BQ reference drilling depth is 350 m, NQ is 200 m, and HQ is 150 m. Upward boreholes can be used to verify mineralization above tunnels, roof structures, resources in the upper part of mining areas, or targets that are difficult to control with downward holes. Different mines may have different definitions of angle sign conventions; the on-site installation direction and design drawings should be the basis before formal construction.

🥇 Vein Tracking and Grade Control in Underground Gold Mines

Vein gold deposits and structurally altered gold deposits require continuous confirmation of vein strike, dip, thickness, and grade changes during mining. The CR800UG can use existing tunnels to arrange multi-directional boreholes, determining ore body boundaries and internal structures through continuous core samples, providing geological basis for stope design, pillar control, and subsequent excavation.

🟠 Supplementary Exploration in Copper, Lead-Zinc, and Polymetallic Mines

Underground copper, lead-zinc, and polymetallic mines often require continuous supplementary drilling around production levels to verify ore body boundaries, fault locations, and new mineralization extensions. Underground boreholes are closer to the target body, allowing more concentrated acquisition of local ore section core data, which is beneficial for short-cycle updates to geological models.

🧭 Advanced Geological Drilling for Risk Identification Ahead of Tunnels

The equipment can also be used for advanced geological surveys ahead of tunnel excavation, identifying faults, fracture zones, weak interlayers, and water-bearing structures through core sampling. For areas that may have water inrush, surrounding rock instability, or sudden lithology changes, obtaining core information in advance can provide a basis for support, drainage, and pre-grouting plans.

💧 Water-Bearing Faults and Pre-Grouting Investigation

Water-bearing fractures and water-conducting structures underground directly affect mine construction safety. Through drill core, return water, and pump pressure changes, the development of fractures and water-bearing structures can be assessed. The equipment can be optionally equipped with a 120-series high-pressure plunger pump, with a maximum flow rate of 120 L/min and maximum pressure of 70 bar, for flushing and certain special circulation conditions.

⚙️ 65 kN Feed Force and 130 kN Retraction Force

The feed mechanism is driven by hydraulic cylinders with a stroke of 1800 mm, feed force of 65 kN, retraction force of 130 kN, and rapid traverse speed of 0.9 m/s. The drill string stress states for horizontal, downward, and upward holes are not the same; feed and retraction parameters should be adjusted based on hole direction, depth, and friction changes.

🔄 600–1480 N·m Hydraulic Top Drive Power Head

The power head uses a hydraulic top drive with a speed range of 0–1500 rpm and torque range of 600–1480 N·m, equipped with a 107 variable displacement motor. The wide speed range facilitates selecting working conditions based on BQ, NQ, HQ specifications and rock hardness, allowing parameter adjustments between intact hard rock and fractured hole sections.

🔒 128 mm Through-Hole Clamp for Easy Underground Drill Rod Handling

The drill rod clamp has a maximum applicable drill rod size of 108 mm, through-hole of 128 mm, and clamping force of 80 kN. Underground drill sites have limited space, and drill rod make-up/break-out and wellhead operations are concentrated; stable clamping can reduce the risk of drill rod slippage. During operation, the wear of clamping blocks and hydraulic pressure should be regularly checked.

🧵 800m Wireline Winch Suitable for Underground Wireline Core Drilling

The winch system has a rope capacity of 800 m using 6 mm wire rope. The data indicates a minimum lifting force of 800 N at full drum, maximum lifting force of 1800 N at empty drum, and lifting speeds from 1.8 m/s to 4.8 m/s. Wireline core drilling reduces repeated tripping of the entire drill string, which is beneficial for reducing auxiliary time in underground medium-deep hole operations.

🛢️ 200 L/min Hydraulic System for Multi-Mechanism Coordination

The main system flow rate is 200 L/min with a pressure of 210 bar, and the auxiliary pump flow rate is 10 L/min with a maximum pressure of 150 bar. Underground environments have significant humidity, dust, and temperature variations; the cleanliness of hydraulic oil, high-pressure hoses, fittings, and filter status should be continuously checked to prevent contamination and leakage from affecting equipment reliability.

❄️ 100 L Water-Cooled Oil Tank Suitable for Continuous Drilling

The hydraulic oil tank has a capacity of 100 L and uses water cooling. Underground air circulation is limited, and water cooling helps control hydraulic oil temperature, but cooling water supply and heat exchanger cleanliness must be ensured. If water quality is poor, the heat exchanger should be cleaned regularly to avoid scaling that reduces heat dissipation efficiency.

📦 Modular Weights Facilitate Underground Transport Organization

The reference weights of main modules include: power unit 240/270 kg, main feed mechanism 130 kg, drill base frame 120 kg, oil tank unit 120 kg, and control unit 90 kg. Before actual transport, a handling plan should be developed based on cage dimensions, tunnel gradient, track conditions, and on-site lifting capacity.

🧱 Conditions of Fracture Zones, Weak Interlayers, and Fault Gouge

When encountering fault gouge, breccia, or strong fracture zones, the drilling run length should be shortened, feed force reduced, and return water changes observed. If necessary, casing should be used, flushing fluid adjusted, or segmented treatment performed. The focus in such formations is maintaining hole wall stability and improving effective core recovery, rather than simply pursuing footage.

🛡️ Precautions for Underground Installation and Operation

Before equipment installation, the roof, sides, and floor support of the drill site should be checked; the drill base frame must be reliably fixed to avoid equipment displacement due to drilling reaction forces; cables and hydraulic hoses should be routed away from transport paths and sharp rock walls; when performing upward and horizontal holes, special attention should be paid to safety risks from drill rods, core barrels, and high-pressure fluids.

⚠️ Electrical and Explosion-Proof Requirements

Standard motor configurations cannot be directly considered explosion-proof. In coal mines, gas mines, or underground environments with combustible dust, motors, electrical control boxes, cables, and protection systems with appropriate explosion-proof ratings should be selected according to local mine safety regulations. They must not be used directly in areas requiring explosion-proof protection without confirmation.

📌 Parameter Data Notes

In the original parameters, the "control unit weight" has two different annotations: 130 kg in the control unit table, and 90 kg in the main module weight summary. This article retains the original annotations in the parameter tables; the final supply configuration and actual weight should be based on formal technical confirmation documents.

Due to differences in actual geological conditions, downhole tools, drilling angles, and operating methods, the final drilling efficiency, depth, and core recovery results should be based on on-site conditions.

📊 Main Technical Parameters