رافعات للتعدين and Quarries

رافعات للتعدين and Quarries: Heavy Double-Girder, Grab, and Dust-Proof Selection

التعدين and quarry duty cycles punish standard cranes. Abrasive dust, shock loading, and continuous grab work mean a general-purpose overhead crane will fail early. For buyers specifying equipment for aggregate plants, cement works, coal handling, or metal ore yards, the practical answer is usually a heavy double-girder crane with a purpose-matched grab and dust-protection package. This guide covers the models, capacities, and specification points that matter when you request a quote.

Why Double-Girder for التعدين Duty

Single-girder cranes such as the LD (0.5–20T) suit light maintenance and workshop lifting, but grab service changes the calculation. A grab plus its payload is a concentrated, swinging load, and the duty class is عادةً A5–A7 under GB/T 3811 or FEM 1.001. The QD universal double-girder crane (5–150T) is the standard workhorse here, and for continuous ore or coal handling the YZ metallurgical double-girder (5–125T) is the better match because it is built for high-frequency, high-temperature, and impact-prone cycles. Both use Q345B box girders and can be supplied to DIN 15018 or CMAA #70 on request.

For outdoor stockyards and rail-served quarries, the MG double-girder gantry and RMG rail-mounted container gantry cover spans where a runway building is impractical. بناء السفن gantry variants handle heavy fabricated sections if your site also does maintenance fabrication.

Grab Selection: What Actually Moves Ore and Aggregate

The grab is where most under-specified projects lose productivity. Match the grab type to the material, not just the crane tonnage:

Clamshell grab (double-rope, 0.5–6 m³): the default for sand, gravel, crushed stone, and coal. Two-rope closing gives positive digging force. Size the crane so grab dead weight plus material stays within rated capacity — a 4 m³ grab on wet gravel can weigh over 5T empty.
Orange-peel grab (0.75–2 m³): better for irregular lump ore, slag, and rocky spoil where a clamshell will not seal.
Single-rope grab: only for light, free-flowing material. Avoid for quarry duty; the closing force is too low.
Electro-hydraulic grab: consider when you need independent closing force or work from a hook without a double-drum hoist. Higher maintenance, but useful on mixed fleets.

State the material bulk density, maximum lump size, and required tonnes per hour in your inquiry. A 20T QD crane with a 3 m³ clamshell moving 400 t/h is a very different specification from the same crane lifting 20T of bundled steel.

Dust: The Real Killer of التعدين الرافعات

Quarry and ore dust is abrasive and conductive. It destroys standard bearings, shorts control panels, and accelerates wire-rope wear. Practical countermeasures, in order of cost-effectiveness:

IP55 or IP65 motors and panels. Specify IP65 for crusher buildings and screening stations. Schneider, Siemens, ABB, and SEW components are available in these ratings.
Sealed rope drums and shielded festoon or conductor-bar systems. Open festoon cable trays fill with grit within months.
Dust covers on hook blocks and grab hydraulic units. Cheap insurance on electro-hydraulic grabs.
Forced ventilation or air-purge on control cabinets in high-dust zones, plus routine filter changes written into the maintenance schedule.
Anti-corrosion coating systems for wet-process plants and coastal quarries.

For sites where operators should not be exposed to dust or heat, the QDS smart unmanned double-girder crane supports automated grab cycles and remote operation. It is worth quoting when your plant runs multiple shifts and labor exposure is a constraint.

Specification Checklist Before You طلب عرض سعر

Rated capacity and duty class (A5, A6, or A7) — do not accept a generic "heavy duty" label.
Span, lifting height, and travel length, including any rail extension for future stockpile growth.
Material: bulk density, lump size, moisture, temperature.
Required throughput in tonnes per hour, and grab volume/type.
Power supply: 380V/50Hz, 415V/50Hz, 440V/60Hz, or other.
Environment: indoor, outdoor, dusty, corrosive, ambient temperature range.
شهادة: Chunhua، WhatsApp، CE، CCC، SGS، T/T، L/C، USD، QD، LH، MGH، YZ، LB required: CE, EAC (TR CU 010/020), GCC/SASO, SONCAP, or KEBS.

Delivery, شهادة: Chunhua، WhatsApp، CE، CCC، SGS، T/T، L/C، USD، QD، LH، MGH، YZ، LB, and Support

كرين تشون هوا supplies mining and quarry cranes built to GB/T 3811 with FEM 1.001, DIN 15018, or CMAA #70 on request, using Q345B/Q235B steel and Schneider, Siemens, ABB, or SEW drive and control components. Export documentation covers CE, CCC, EAC, GCC/SASO, SONCAP, and KEBS for 60+ countries. There is no MOQ, quotes are returned within a 4-hour SLA, production runs 30–45 days, and every crane carries a 12-month warranty.

إرسال your material data, duty class, span, and throughput target to واتساب +86 193 9277 7259 or yuhua0095@gmail.com for a model recommendation and budget figure. Include grab volume and dust conditions and the quote will come back with a matched QD or YZ configuration rather than a generic tonnage.