L Type Gantry Crane

Key Features of L-Type Gantry Cranes:

Asymmetric Boom Design

One side has a long, extended boom (L-shape), while the other side is shorter or has a vertical support.

Provides extended reach on one side, useful for loading/unloading in tight spaces.

High Load Capacity

Designed for heavy-duty lifting, often used in shipbuilding, steel mills, and large manufacturing plants.

Adjustable Span & Height

Some models allow for span and height adjustments to accommodate different workspaces.

Mobility Options

Can be fixed, semi-gantry (one side supported by a runway), or mobile (on wheels or rails).

Electric or Manual Operation

Smaller L-type gantries may use manual chain hoists, while larger ones use electric or hydraulic lifting systems.

 

Advantages:

✔ Space-saving – Ideal for areas where a full symmetric gantry isn't feasible.
✔ Extended reach – The L-boom allows lifting over obstacles.
✔ Heavy-duty performance – Can handle loads that standard cranes cannot.

Disadvantages:

✖ Limited flexibility – Not suitable for symmetrical lifting needs.
✖ Higher cost – More complex design than standard gantry cranes.

 

Comparison with Other Gantry Cranes:

Feature	L-Type Gantry	Standard Gantry	Semi-Gantry
Boom Design	Asymmetric (L-shape)	Symmetric	One leg supported
Reach	Extended on one side	Balanced	Limited
Best For	Uneven loads, tight spaces	General lifting	Low headroom areas

 

Place of Origin:Henan, China

Warranty:2 years

Weight (KG):60000 kg

Video outgoing-inspection:Provided

Machinery Test Report:Provided

Application:warehouses,factory and other place

Crane type:box type gantry crane

Travelling speed:20m/min

Lifting mechanism:Electric Hoist

Control method:Ground Control+ Remote Control (customized)

Working duty:A5

Working Temperature:-20~+40℃

Industrial voltage:380V50HZ3Phanse or other

Color:Customised

Customization:Accepted

 

 

An L-type gantry crane consists of several key structural and mechanical components that work together to provide its unique lifting capabilities. Below is a detailed breakdown of its main components:

 

1. Main Structural Components

A. Gantry Frame (Bridge & Legs)

Bridge (Girder) – The horizontal beam that spans the work area.

Usually box-type or I-beam construction for strength.

Long Leg (L-Boom Side) – The extended vertical support with an overhanging boom.

Short Leg (Non-Boom Side) – A shorter vertical column (sometimes just a support post).

Base Frame & Wheels (if mobile) – Supports the crane and allows movement (rail-mounted or rubber-tired).

B. L-Boom (Cantilevered Arm)

The defining feature of an L-type gantry crane.

Extends asymmetrically for extended reach on one side.

Reinforced with stiffeners or trusses to prevent deflection.

                                         

2. Lifting Mechanism Components

A. Hoist & Trolley

Electric or Manual Hoist – The lifting device (chain hoist, wire rope hoist, or hydraulic).

Trolley Assembly – Moves along the bridge girder for horizontal positioning.

Can be manual push, motorized, or remote-controlled.

B. End Trucks (for Mobile Gantries)

Wheel assemblies that allow the crane to move along rails or the ground.

May include brakes, drives, and buffers for safety.

C. Runway System (for Fixed/Semi-Gantry)

Rails or tracks on which the crane moves (if not freestanding).

3. Support & Stability Components

A. Outriggers / Stabilizers

Extendable legs to prevent tipping when lifting heavy loads.

Common in mobile L-type gantries.

B. Counterweights (Optional)

Used to balance the crane when lifting heavy loads on the extended boom side.

C. Bracing & Reinforcements

Diagonal supports or crossbeams to enhance rigidity.

4. Control & Safety Components

A. Control System

Pendant Control (Hanging Remote) – For operator use.

Radio Remote Control – Wireless operation.

Cabin Control (for large cranes) – Operator sits in a cabin.

B. Safety Features

Limit Switches – Prevents over-travel of the hoist/trolley.

Overload Protector – Alerts/shuts down if capacity is exceeded.

Anti-Collision Sensors – For multiple cranes in the same area.

Emergency Stop (E-Stop) – Instantly cuts power.

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5. Electrical & Power Components

A. Power Supply

Cable Reel / Festoon System – Delivers electricity to the hoist and trolley.

Battery (for mobile gantries) – If not grid-powered.

B. Motors & Drives

Hoist Motor – Powers the lifting mechanism.

Trolley Drive Motor – Moves the hoist along the girder.

Gantry Travel Motor (if mobile) – Moves the entire crane.

6. Optional Add-Ons

Anti-Sway System – Reduces load swing.

Weigh Scale – Measures lifted load weight.

Automation (PLC Control) – For programmed movements.

LED Lighting – For low-light work areas.

Sketch

Main technical

 

L-type gantry cranes offer unique benefits due to their asymmetric boom design, making them ideal for specialized lifting tasks. Key advantages include:

Extended Reach on One Side

The L-shaped boom provides a long cantilever, allowing operators to lift and move loads over obstacles (e.g., machinery, walls, or other obstructions).

Ideal for tight spaces where a standard gantry crane cannot fit.

Space Efficiency

Requires less floor space than a double-girder or symmetric gantry crane.

The short-leg side can be positioned near a wall or support structure, maximizing workspace.

High Load Capacity

Designed for heavy-duty lifting (common in shipyards, steel mills, and construction).

Some models include counterweights for extra stability when handling uneven loads.

Versatile Mobility

Available in fixed, rail-mounted, or rubber-tired configurations.

Mobile versions can be repositioned as needed.

Customizable Configurations

Adjustable span, height, and boom length to suit different applications.

Can be fitted with electric, hydraulic, or manual hoists.

Cost-Effective for Specialized Tasks

More efficient than using two separate cranes for asymmetric lifting.

Reduces the need for additional material handling equipment.

 

Due to their unique design, L-type gantry cranes are used in industries where extended reach and heavy lifting are required. Common applications include:

1. Shipbuilding & Ports

Loading/unloading ship components, engines, and large steel sections.

Ideal for dry docks where space is constrained.

2. Steel & Metal Fabrication

Handling steel coils, beams, and plates in rolling mills.

Moving heavy materials over machinery in fabrication shops.

3. Construction & Precast Concrete

Lifting precast concrete slabs, bridge segments, and structural elements.

Useful in confined urban construction sites.

4. Warehousing & Logistics

Loading/unloading long or bulky items (pipes, timber, machinery).

Used in workshops with limited headroom.

5. Railway & Heavy Machinery

Assembling locomotives, rail tracks, and large industrial equipment.

Maintenance of mining and oilfield machinery.

6. Power Plants & Industrial Facilities

Installing turbines, generators, and boilers.

Handling large industrial components in tight spaces.

 

 

The production procedure for a single beam traveling gantry crane involves several key stages, from design and material procurement to assembly, testing, and final delivery. Below is a step-by-step outline of the typical manufacturing process:

1. Design & Engineering
Customer Requirements Analysis: Determine lifting capacity, span, lifting height, duty cycle, and operating environment.

Structural Design:

Design the main girder (single box or I-beam structure).

Design end carriages (legs/wheels) and runway beams.

Select hoist/trolley type (electric or manual).

Load & Stress Calculations: Ensure compliance with standards (ISO, FEM, DIN, or ASME).

Electrical & Control System Design: Choose motors, brakes, limit switches, and control panels.

2. Material Procurement
Steel Plates & Profiles: High-quality Q235B/Q345B steel for main girders and supports.

Mechanical Components: Wheels, axles, bearings, gears, and couplings.

Electrical Components: Motors, cables, control panels, and safety devices.

3. Fabrication of Main Components
A. Main Girder Fabrication
Cutting: CNC plasma/oxy-fuel cutting for precision.

Welding: Automated submerged arc welding (SAW) for strong seams.

Straightening & Inspection: Ensure proper camber (pre-bend) and check for defects (UT/RT testing).

B. End Carriages & Legs
Frame Assembly: Welded steel construction with reinforced bracing.

Wheel & Bearing Installation: Machined wheels for smooth travel.

C. Hoist & Trolley
Pre-assembled Hoist: Electric chain hoist or wire rope hoist.

Trolley Frame: Fabricated to accommodate hoist movement.

4. Surface Treatment & Painting
Shot Blasting: Removes rust and improves paint adhesion.

Primer & Paint: Anti-corrosion coatings (epoxy + polyurethane).

5. Assembly
Girder & End Carriage Joining: Bolt or weld the main beam to legs.

Hoist/Trolley Installation: Mounted on the girder.

Electrical Wiring: Connect motors, controls, and safety devices.

6. Testing & Quality Control
Dimensional Inspection: Verify span, height, and alignment.

Load Testing:

Static Load Test: 125% of SWL (Safe Working Load).

Dynamic Load Test: 110% of SWL with operational checks.

Functional Tests: Travel, lifting, braking, and limit switch verification.

7. Disassembly & Packaging
For Shipment: Crane may be disassembled into modules (girder, legs, hoist).

Protective Packaging: Waterproof wrapping for sea transport.

8. Installation & Commissioning (On-Site)
Runway Preparation: Ensure level rails or ground support.

Reassembly: Bolt components together.

Final Testing: Operational checks under load.

9. Documentation & Delivery
Manual & Certificates: Include load test reports, CE/ISO certifications.

Training: Operator and maintenance guidance.

Workshop view:

The company has installed an intelligent equipment management platform, and has installed 310 sets (sets) of handling and welding robots. After the completion of the plan, there will be more than 500 sets (sets), and the equipment networking rate will reach 95%. 32 welding lines have been put into use, 50 are planned to be installed, and the automation rate of the entire product line has reached 85%.