MHL Single Girder Offset Hoist Gantry Crane

Product Introduction

The MHL Type Single-Girder Offset-Leg Gantry Crane (also known as the L-Type Offset-Leg Gantry Crane) is designed for outdoor material handling applications with lifting capacities from 1 to 32 tons and spans from 10 to 35 meters. Unlike the standard MH Type gantry crane, the MHL Type features curved (L-shaped) outriggers that provide significantly greater lateral clearance between the legs. This makes it ideal for handling long materials such as steel pipes, rebar, timber, and plates, allowing loads to pass freely between the legs and rotate through wide angles without obstruction.

This crane model is widely used in steel markets, port terminals, railway freight yards, open-air warehouses, and timber processing facilities. Lifting capacity, span, lifting height, and cantilever length can all be custom-manufactured to suit specific operating conditions. Standard configuration includes a CD1 Type wire rope hoist, with the optional MD1 two-speed version available for precise positioning.

Product Specifications

• Product Name: MHL Type Single-Girder Offset-Leg Gantry Crane (L-Type Offset-Leg Gantry Crane)
• Model & Specification: MHL Type, lifting capacity 1–32 tons (custom non-standard manufacturing available)
• Place of Origin: Xinxiang, Henan (Kelude Heavy Industry)
• Custom Non-Standard Manufacturing: Span, lifting height, cantilever length, and lifting capacity can all be customized
• Hoisting Mechanism: CD1 Type wire rope hoist (MD1 two-speed + remote control optional)
• Applicable Span: 10–35 meters (custom spans available beyond standard range)

Product Images

The image above shows an actual MHL Type Single-Girder Offset-Leg Gantry Crane. The curved outrigger design creates open lateral space between the legs, allowing long loads to pass through and rotate without interference from the columns.

Product Features

• Curved Outriggers for Maximum Clearance: The inclined/curved L-shaped outrigger design maximizes lateral clearance between the legs, allowing long materials (steel pipes, rebar, plates) to pass through and rotate freely without obstruction.
• Purpose-Built for Long Materials: Specifically engineered for loading, unloading, and handling oversized materials such as rebar, steel pipes, timber, and plates. When paired with a lifting magnet or specialized lifting spreader, it dramatically improves efficiency in long-material storage yards.
• Optional Cantilever Extension: External cantilevers can be added to both ends of the main girder, extending coverage directly over stockpile areas. Loads can be lifted and placed directly across stacks, eliminating secondary handling.
• Lightweight, Cost-Effective Structure: The single main girder design combined with electric hoist lifting reduces overall dead weight by 30%–40% compared to double-girder gantry cranes of equal capacity, lowering foundation construction costs and shortening installation time.
• Multiple Drive Options: Supports three control modes — ground pendant (wired), wireless remote control, and cab operation — which can be mixed and matched. The operator cab can also be equipped with a remote control.
• Versatile Applications: Can be fitted with lifting magnets up to 2 meters in diameter, grabs up to 8 cubic meters, or custom-engineered lifting spreaders for specialized tasks.

Working Principle

The MHL Type Offset-Leg Gantry Crane moves longitudinally along runway rails via the bridge travel mechanism, while the electric hoist traverses laterally along the bottom flange of the main girder's I-beam. This enables three-dimensional material handling within a rectangular working area. The offset (L-shaped) outrigger design allows long materials to extend between the legs, offering far greater operational flexibility than standard gantry cranes.

Hoisting Operation: When power is applied to the conical rotor motor of the CD1 electric hoist, it drives the three-stage helical gear reducer, which rotates the drum to wind the wire rope and lift the hook block. Hoisting speeds are 8 m/min for 5-ton and below, 7 m/min for 10-ton, and 3.5 m/min for 16-ton models. On power failure, the cone brake automatically engages, ensuring the load remains securely suspended.

Horizontal Travel: The bridge drive motor powers the wheel blocks through the gearbox to move the crane forward/backward along the rails (standard speed 20 m/min, high-speed option up to 30 m/min). The trolley hoist travels along the main girder for cross-travel movement. The electrical control system coordinates all mechanisms to complete the full work cycle of hoisting, traversing, and lowering.

Product Structure

The MHL Type Single-Girder Offset-Leg Gantry Crane consists of the following core components:

Main Girder Assembly: Single box-section welded structure fabricated from Q355B (≈S355JR) steel plate using submerged arc automatic welding. The camber of the main girder is controlled to GB/T 3811 Crane Design Standard (mid-span camber of 1/1000). The girder section incorporates the runway for the electric hoist, which is suspended from and travels along the bottom flange.

Curved Outriggers: The defining feature of the MHL Type — the outriggers feature an inclined/curved L-shape, welded from angle steel or steel pipe, providing greater lateral clearance between the legs. Long materials can pass between the legs and rotate through wide angles without column interference. The lower ends of the outriggers are welded to ground beams, which are secured to the concrete foundation with anchor bolts.

Bridge Travel Mechanism: Comprises the motor, gearbox, and driving/driven wheel blocks. Wheel material is ZG310-570 cast steel or 65Mn, with the tread surface induction-hardened to HRC40–50. Individually driven (two independent drive units), designed for outdoor rail operation.

Electric Hoist: CD1 Type wire rope hoist, featuring a conical rotor motor (with integrated brake), three-stage helical gear reducer, drum, wire rope (6×37+IWR), and hook block (with hook latch). Optional MD1 two-speed version available for precise positioning.

Electrical Control System: Main circuit breaker, contactors, thermal overload relays, power-off limit switch, overload limiter (optional), remote receiver / wired pendant. Control voltage: AC 36V safety voltage. Power supply via enclosed conductor rail (installed along the runway) or cable reel.

Technical Parameters

MHL Type Single-Girder Under-Slung Gantry Crane – General Technical Parameters

Typical Applications

• Steel markets & long-material yards: Loading, unloading, and stacking of rebar, steel pipes, H-beams, and steel plates. Long loads can rotate freely within the space between the curved outriggers without interference from columns.
• Port terminals: Handling of long general cargo (timber, steel billets, container fittings) from railcars or trucks.
• Railway freight stations: Unloading of long materials from open-top wagons and boxcars. When paired with a lifting magnet, the crane efficiently handles rails, rebar, and similar loads.
• Timber processing yards: Yard handling and loading/unloading of logs, lumber, and square timber. The L-shaped outriggers provide ample clearance for long timber.
• Open-air warehouses & transfer yards: Transfer and storage of various long-sized materials. Can be equipped with a grab for bulk materials (sand, gravel, coal).

Selection Guide

Light-duty long-material applications: MHL type, 1–5t capacity, 10–19m span. Ideal for small steel markets, timber yards, and rebar processing workshops. Equipped with a CD1 electric hoist (lifting speed 8m/min). Reference price: RMB 30,000–80,000.

Medium-duty general applications: MHL type, 5–16t capacity, 19–28m span. Suitable for main steel market operations, railway freight stations, and port yards. Standard configuration includes a CD1 hoist (8m/min for ≤5t, 7m/min for 10t, 3.5m/min for 16t). Reference price: RMB 80,000–180,000.

Heavy-duty applications: MHL type, 16–32t capacity, 28–35m span. Designed for heavy steel distribution centers, port terminals, and large steel fabrication plants. Can be paired with an HC series heavy-duty box-type electric hoist. Foundation load capacity and wind protection (rail clamp or anchoring) must be confirmed. Reference price: RMB 180,000–400,000.

Selection notes: Please provide the lifting capacity, span, lifting height, and maximum material length (to verify outrigger spacing meets rotation requirements). The Kelude Heavy Industry technical team will provide a free selection proposal and foundation drawings.

Operating Instructions

Pre-operation checks: Verify the crane rail is clear of obstructions, all mechanisms are properly lubricated, the wire rope shows no broken wires or strands, brake clearance is correct, limit switches are responsive and reliable, and the controller functions properly.

Operation: Before lifting long materials, perform a trial lift (raise 200mm off the ground to confirm balance and braking reliability). Never allow personnel under the suspended load. When rotating long loads, ensure sufficient clearance from surrounding obstacles and use guide ropes to control swing.

Shutdown procedure: After operations, raise the hook to the upper limit, park the trolley at the designated position, and move the crane to the anchoring zone. Cut off the main power supply. For outdoor parking, engage the rail clamps to prevent wind-driven movement.

Maintenance: Check wire rope lubrication and wear monthly; inspect brake friction lining thickness and rail straightness quarterly; conduct a comprehensive annual safety inspection (including load test, wind protection device check, and grounding resistance test).

Service & Support

Kelude Heavy Industry provides full life-cycle support for the MHL single-girder offset-mount gantry crane: free site survey, foundation design, steel structure fabrication, installation & commissioning, operator training, and annual maintenance. For more models, technical parameters, and quotations, call 13903802779 or contact our online support — response within 24 hours.

Need a selection proposal or quotation for the MHL offset-mount gantry crane?
Contact the Kelude Heavy Industry sales & technical team anytime — free design consultation and technical support.

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