Custom Semi Gantry Crane for Manufacture, Warehouse

Semi-gantry cranes combine the span coverage of bridge cranes and the floor-mounted flexibility of gantry cranes. One end rides on above runway rails, similar to a bridge crane, while the other end goes on its own support leg along a ground-level track. Semi-gantry cranes are a space-efficient choice for facilities lacking full runway systems, as its hybrid structure saves headroom and foundation work.

Key Features

This semi gantry crane is designed to give you a practical and cost-effective lifting solution for manufacturing plants and warehouses. It combines the flexibility of a gantry system with the space efficiency of an overhead crane. You get strong lifting performance without needing full runway beams on both sides. The design works well for facilities that want reliable lifting but need to control installation costs and keep floor space open.

1. Durable Construction

The main beam and support leg use Q235B or Q345B structural steel, which offers good strength and toughness for industrial use. These materials weld easily and perform well under repeated lifting cycles and dynamic loads. Weld seams go through non-destructive testing to ensure safety and quality. We apply primer and top coatings to protect the steel from rust and wear, so the crane can operate reliably indoors or outdoors with minimal maintenance.

2. Smooth and Flexible Operation

Motor drives and PLC systems provide precise control over bridge travel, trolley movement, and lifting. VFD technology reduces shock during starting and stopping, which protects the structure and improves load stability. High-quality gearboxes and sealed bearings keep motion smooth and quiet. Operators can move loads accurately, even at higher speeds, which improves productivity and reduces handling time.

3. Customizable Options

You can tailor the semi gantry crane to match your lifting needs and site conditions. Capacities typically range from 2 tons to 20 tons, with spans up to 20 meters and lifting heights from 2 to 30 meters. Optional features include dual-speed hoists, wireless remote control, anti-collision systems, and special coatings for harsh environments. Each crane is engineered to fit smoothly into your workflow and support your production goals.

4. Wide Applicability

This crane suits many industrial scenarios, such as production lines, warehouses, loading docks, and outdoor fabrication areas. The single support leg design removes the need for full runway beams on both sides, which helps when building structures cannot support overhead rails. It also simplifies installation and reduces civil engineering costs. If you need flexible lifting in a space with structural limits, this semi gantry crane is a practical and efficient choice.

Technical Structure

The Semi Gantry Crane by Yuantai Crane features a robust, carefully engineered design consisting of four primary components: the bridge, crane traveling mechanism, lifting mechanism, and electrical system.

1. Bridge

The bridge is the structural backbone of the semi‑gantry crane, providing the platform for load transfer and movement. It integrates several key components—main girder, upper and bottom beams, landing legs, and ladder landing—each engineered for strength, safety, and ease of installation.

1.1 Main Girder

The primary girder supports the entire hoist load and guides the trolley down the runway. The structure consists of welded U-steel and I-beam sections made of Q235B or Q345B steel (equal to Fe37 or Fe52). To counteract deflection under load, the girder has a regulated camber of 1/1000 to 1.4/1000 of the span, with the largest rise at the span's midway (S/10). The trolley is equipped with bumpers at both ends to prevent overtravel. Dynamic analysis assures that the full-load natural frequency remains above 2Hz while the hoist is centered, preventing resonance during cyclic operations.

1.2 Landing Legs

The landing legs are made of welded plate steel with a tapered flange-box profile. They transition from a large top flange that attaches to the bottom beam to a narrower base flange for floor mounting. The A-frame design with bolted splice connectors facilitates transportation and on-site installation. Angled leg spacing improves lateral and vertical stability, reduces vibration, and ensures even weight distribution throughout crane travel.

1.3 Ladder Landing

The ladder landing is a welded component made of angle, flat, and round steel that bolts directly to the landing leg. This integrated access platform enables safe, no-weld installation of maintenance ladders and guardrails. It enables personnel to reach the bridge components for normal inspections and maintenance without requiring additional field fabrication.

2. Crane Traveling Mechanism

The crane's integrated components ensure stable, low-maintenance horizontal motion. Brake-type motors positioned above the bottom beam save space and provide consistent stopping power. The motors drive a vertical-triangle reducer with open gearing, which eliminates the need for connections and reduces wear points. When the reducer output is turned, double-rim wheels securely grip the rail, reducing derailment danger and smoothing travel over minor track irregularities. Bolt-connected baffles protect the crane's wheels and gears from debris and may be easily removed for inspection or repairs, ensuring reliable operation with minimal downtime.

3. Lifting Mechanism

3.1 CD/MD-type Electric Hoists

Our CD/MD-type electric hoists provide smooth and efficient vertical travel using precision-engineered steel gears and robust rope drums. Each hoist has a dual-speed engine for fast lifting and slow, precise positioning. Load limiters monitor the lift in real-time and alert users when it reaches 90% of its capacity. If the load increases, the system will immediately cut power at 110% to prevent overload. When power is lost, heavy-duty brakes rapidly engage to secure the load and ensure safe, controlled operations in any conditions.

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3.2 European-Standard Electric Wire

A European-standard electric wire rope hoist meets EN14492-2 and FEM requirements. It has an efficient motor and a frequency inverter for variable speed control. The safety features include a load limiter, emergency stop, and spring-loaded brake. The hoist's modular design features plug-in components for easy maintenance. Capacity ranges from 1 to over 80 tons. It seamlessly connects into single or double-girder crane systems. The gearbox and motor are protected by dust and water-resistant casings. This hoist is ideal for workshops, warehouses, and industrial plants that require consistent, standards-compliant hoisting.

3.3 Electric Chain Hoist

A electric chain hoist is a compact lifting equipment that meets EN (European Norm) safety and performance standards. It has a low headroom design, precision load positioning, and smooth lifting capabilities thanks to inverter or two-speed motors. The hoist body is normally constructed of high-strength alloy steel with a powder-coated finish. Standard features include overload protection, upper and lower limit switches, and dependable electromagnetic brakes. European electric chain hoists are excellent for workshops, assembly lines, warehouses, and light industrial applications that demand precise and safe weight lifting. When making a selection, crucial things to consider include capacity, lifting height, duty class, and control type.

European-Style Electric Chain Hoist with Electric Trolley

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Explosion-Proof Electric Chain Hoists

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Hook Type Electric Chain Hoist

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Low Headroom Electric Chain Hoist

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4. Electrical System

The electrical system is responsible for powering the machine, controlling movement and helping to protect the operator and your lifting equipment. Yuantai's electrical systems feature clear labeling, easy-to-access components and a range of safety features. Good electrical system design helps reduce crane downtime and simplifies inspection and maintenance time.

4.1 Power Supply

Crane power can be delivered several ways to suit your site and load profile. Fixed slide-wire conductors work well for long travel runs. Festoon or soft cables on carriers give a tidy, low-tension option for frequent moves. Cable drums are compact and protect conductors where space is tight. For trolley feeders, cable pulleys running on wire rope, an I-beam flange, or a deformed-steel slideway keep the cable aligned and reduce wear. Look for phase monitoring, surge protection, and provision for a main isolation switch so you can lock out the crane for safe maintenance.

4.2 Control Modes

Control choices influence safety, productivity, and operator comfort. A pendant control gives direct, intuitive operation at low cost. Industrial remote (RF) control frees the operator to stand where they can see the load and improves safety. Cabin control places all functions at a seated operator's fingertips using buttons, switches, joysticks, or mechanical linkages. Modern cranes often use VFDs and PLCs to smooth motion and provide programmable, repeatable behavior. Dual-control arrangements, such as pendant plus remote, are common.

4.3 Safety Features

Electrical safety components protect the operator against damage caused by malfunctions. Short-circuit protection uses automatic air-breakers and appropriate fusing to isolate faults quickly. Overload relays and thermal protection prevent motor damage. Voltage-loss protection keeps the crane from restarting automatically when power returns after an outage. Emergency stop mushroom switches sit in easy reach around the working area for instant shutdown. Position limiters prevent hoist or trolley overtravel and stop accidental hits to structure. For outdoor cranes, windproof clamps lock the carriage to the rail and are interlocked with the main power to stop operation when engaged. Grounding and bonding are mandatory: all metal parts should be tied to earth with resistance at or below 4 Ω and tested regularly.

Technical Data of Single Girder Semi Gantry Crane

Applications

Semi gantry cranes are widely used in factories, warehouses, workshops, and open yards where you need reliable lifting without building a full crane runway system. You can use this type of crane to move heavy materials, steel parts, machines, and prefabricated components across work areas with high efficiency. It works well in places with limited space because one side runs on a ground rail while the other side connects to an existing building structure. This design helps you save floor space and reduce construction costs. It also supports indoor and outdoor operations, making it a flexible solution for daily material handling tasks.

These cranes are especially useful in manufacturing plants, steel processing areas, shipbuilding yards, and logistics centers where you need stable and precise lifting. You can handle loading and unloading of trucks, position large workpieces for assembly, and organize storage areas more effectively. The crane runs smoothly and gives you better control when lifting and placing heavy loads. This improves workplace safety and reduces manual labor. With the right configuration, you can adapt the crane to light, medium, or heavy lifting needs, helping you match the equipment to your real working conditions.

Safety and Reliability

Semi-gantry cranes must protect people, loads, and your site. Good safety systems reduce accidents and lower downtime. They also help you meet local rules and insurance requirements. When you inspect a crane, focus on devices that stop dangerous events before they start. Look for features that are tested, clearly marked, and easy for operators to use.

1. Overload Limiters

An overload limiter that warns at 90% and stops at 110% is essential. It gives you a clear buffer so operators can react before a dangerous condition. Modern units use electronic load cells or strain-gauge transducers tied to a control unit. Choose one with visible alarms, adjustable thresholds, and a reliable data log for audits. Make sure the limiter is calibrated after installation and checked at regular intervals. Also confirm the limiter's behavior with your hoist and trolley so it arrests lifting smoothly and does not shock the structure.

2. Position Limiters

Position limiters prevent travel beyond safe zones. They stop the hoist at upper and lower travel ends and keep the crane from running off its rails. You'll find mechanical cams, proximity sensors, or encoder-based systems. Encoder systems give finer control and easier diagnostics. Ensure the limiters have fail-safe wiring and clearly set dead-band margins so small position errors don't trigger nuisance stops. Verify the limits during commissioning and after any structural changes. Proper setup reduces wear and prevents collisions with building elements or other equipment.

3. Windproof Clamps

Windproof clamps secure the crane in place outdoors. They stop accidental movement when you're not operating. Clamps range from simple mechanical locks to hydraulically actuated units with sensors that auto-engage above a set wind speed. Install clamps at recommended anchor points and test them periodically. If storms are common where you operate, pair clamps with an operational plan that includes safe parking positions and lock-out procedures.

4. Emergency Power Cutoffs

Emergency power cutoffs let you stop energy to the crane instantly. A good system includes an easily reached emergency-stop button at the cab, remote E-stop stations around the work area, and an automatic cutoff that isolates drive power while keeping brakes applied. Some designs keep control power for diagnostics while cutting motor power; others include battery backup for safe shutdown. Test all cutoffs frequently and log tests so you can prove compliance after an incident.

5. Ground Protection

Ground protection keeps you safe from electrical faults and lightning. All metal parts should be bonded to a low-resistance earth system. Use appropriately sized earthing conductors and connectors made for outdoor and industrial environments. Verify earth resistance with periodic tests and after any structural or electrical work. If your crane will be outdoors, add lightning protection and surge arrestors on power feeds. Proper grounding also prevents stray currents that can corrode rails and foundations, so include ground checks in your maintenance schedule.

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• Phone: +8615003854290

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