300 رافعة جسرية بعارضة مزدوجة طن

When your operation needs to move loads of 300 طن أو أكثر, day after day, a standard overhead crane is no longer enough. ال 300 ton double girder gantry crane is a heavy-duty lifting system engineered for exactly this job: two parallel box girders supported by floor-mounted legs, with a trolley that travels along the girders and hoists loads rated up to 300 طن متري.

300 ton double girder gantry crane

Its double-girder structure delivers the rigidity, stability and headroom that single-girder designs cannot offer at this capacity. That is why it is the industry-standard solution in shipbuilding, steel processing, precast concrete production, bridge construction and heavy machinery assembly — anywhere that large, expensive loads must be handled with precision and safety.

ما هو 300 رافعة جسرية بعارضة مزدوجة طن?

رافعة جسرية (وتسمى أيضًا رافعة البوابة) is a bridge crane whose main girders are carried by legs that run on ground-level rails, instead of being mounted on building walls or columns. The “double girder” configuration uses two parallel main girders, which allows a heavier rated capacity, greater hook travel height, and better stability than a single-girder design.

300+300 ton double girder gantry crane

A typical 300 t gantry crane consists of:

• ◆ Two box-type main girders — the primary load-bearing structure
• ◆ A trolley fitted with a 300 t main hoist and, عادة, an auxiliary hoist (typically 50–80 t) for lighter and faster handling
• ◆ Two legs (A-frame or U-frame) that connect the girders to the ground
• ◆ End carriages with travel drive units that move the whole crane along the rails
• ◆ An electrical control system — operated from a cabin, a pendant station, أو جهاز تحكم عن بعد لاسلكي

The crane handles loads through the main hook, while the auxiliary hook lifts smaller loads or flips and positions workpieces — so a single machine covers a full range of lifting tasks.

المواصفات الرئيسية

The table below shows typical configurations. Every parameter — span, ارتفاع الرفع, speeds, duty class and control mode — is fully customizable to your site and application.

Main Components and Construction Quality

1. Box-Type Main Girders

The two main girders are the heart of the crane. They are fabricated from Q355B low-alloy structural steel, welded with automatic submerged arc welding, and then stress-relief annealed to remove internal welding stress. This prevents deformation during long-term heavy-load operation. The girder cross-section is optimized with finite element analysis (الهيئة الاتحادية للبيئة) to balance dead weight and load capacity, which means high rigidity and low deflection — critical for accurate positioning of 300-ton loads.

2. Trolley with Main and Auxiliary Hoists

The trolley carries the main hoist (300 ر) and an auxiliary hoist. Heavy-duty hoisting mechanisms are designed for smooth, controlled lifting with reliable braking. Variable-frequency drive (VFD) is available for stepless, jerk-free speed control on hoisting, trolley travel and crane travel.

300 ton double girder gantry crane

3. Legs and End Carriages

The girders are supported by A-frame or U-frame box legs that give the crane a wide, stable base — essential for outdoor operation in wind. The end carriages use an integrated box structure with a three-in-one motor-reducer-brake drive unit, ensuring smooth and reliable travel along the rail.

4. Electrical and Safety Systems

كل 300 t gantry crane is fitted with comprehensive protection, مشتمل:

• ◆ Overload limiter
• ◆ Hoisting and travel limit switches
• ◆ Anti-collision devices
• ◆ Wind speed alarm (for outdoor installations)
• ◆ Emergency stop and audible/visual alarms
• ◆ Dual braking on the hoisting mechanism
• ◆ Lightning protection and rain-proof enclosures for outdoor use

Design Standards and Safety

The crane is designed in compliance with international crane standards, بما في ذلك فيم, ISO, DIN and GB, and can be supplied with CE documentation for European projects. The duty class (A3–A5 / M3–M5) is selected according to your actual workload — the number of operating hours per day and the frequency of full-load lifts — so you never pay for unnecessary capacity, and you never undersize the structure.

300 ton double girder gantry crane

Double Girder vs. رافعة جسرية بعارضة واحدة

For 300-ton applications, a double girder design is the only practical choice.

300 Ton Double Girder Gantry Crane Applications

ال 300 ton double girder gantry crane is widely used in:

• ◆ بناء السفن — hull block assembly, section turnover and dry-dock / slipway handling (shipyard models with spans of 50 m and above, and lifting heights over 50 م)
• ◆ مصانع الصلب — lifting steel coils, slabs and bundles, often with C-hooks, lifting magnets or grabs
• ◆ Precast concrete yards — mold handling and product stacking
• ◆ Bridge and infrastructure construction — erection of heavy precast beams and segments
• ◆ Heavy machinery manufacturing — assembly and turnover of large components such as turbines, transformers and pressure vessels
• ◆ Ports and storage yards — container and bulk cargo handling with appropriate attachments

خيارات التخصيص

كل 300 t gantry crane is engineered for its site. Common customization includes:

• ◆ سبان, lifting height and rail gauge
• ◆ Auxiliary hook capacity and lifting speeds
• ◆ Cabin, pendant or wireless remote control
• ◆ Rail-mounted or rubber-tyred travel
• ◆ Special attachments: خطاف C, spreader beam, lifting magnet, grab or rotating hook
• ◆ Adaptations for extreme environments: high wind zones, coastal salt corrosion, low temperatures or high dust
• ◆ Hot-dip galvanized or heavy-duty paint systems for outdoor service

How to Choose the Right 300 رافعة جسرية طن

Before requesting a quote, prepare the following information:

• 1. Maximum load weight and dimensions — including any future load growth
• 2. Span and required lifting height — measure the distance between rails and the highest point you need to reach
• 3. Duty cycle — how many hours per day and how many lifts per hour
• 4. Working environment — indoor or outdoor, wind conditions, درجة حرارة, الرطوبة والغبار
• 5. Power supply and control preference
• 6. Required standards and certifications — FEM, ISO, غيغابايت, م, إلخ.

A reputable manufacturer will provide a design drawing, load chart and FEM/ISO calculation report before production, and full after-sales support with spare parts and installation guidance.

مصنع ويهوا

الأسئلة الشائعة حول 300 رافعة جسرية بعارضة مزدوجة طن

س 1: How much does a 300 ton double girder gantry crane cost?

أ: The price depends mainly on span, ارتفاع الرفع, فئة الواجب, control mode and optional equipment. Because every heavy gantry crane is engineered to order, suppliers quote per project — contact us with your requirements for a detailed quotation.

Q2: What is the difference between a gantry crane and an overhead crane?

أ: An overhead crane runs on rails mounted on building walls or columns, while a gantry crane stands on its own legs and runs on ground-level rails. Gantry cranes are ideal for outdoor yards and sites without runway support structures.

س 3: هل يمكن تخصيص الامتداد وارتفاع الرفع?

أ: نعم. Standard spans are typically 18–40 m, and shipyard models can reach 89 m or more. Lifting height is customized according to your site, حتى 76 m in shipbuilding applications.

س 4: What standards does the crane comply with?

أ: The crane is designed to FEM, ISO, DIN and GB standards, with CE documentation available for European projects. Duty class is selected based on your actual workload.

س 5: How long is the delivery time?

أ: Delivery depends on configuration and production schedule. Heavy-duty cranes are typically manufactured to order — confirm the lead time with your supplier when you place the order.

Get a Tailored Quote

أ 300 ton double girder gantry crane is a long-term investment in your production capacity. Choose a manufacturer that provides custom engineering, FEM-verified design, quality manufacturing and reliable after-sales service. Send us your load, span and lifting-height requirements — our engineers will reply within 24 hours with a design proposal and quotation.