Mobile Single Girder Crane Gantry

 

Key Features:
Single Girder: One main beam supports the hoist/trolley.

Mobility:

Wheels can be rubber-tired or steel wheels on rails.

Moves along the ground or rails for flexible operation.

Adjustable Span: Some models allow adjusting the distance between legs.

Hoist/Trolley: Mounted on the girder, can travel along the beam.

Load Capacity: Generally ranges from 1 ton up to 20 tons or more, depending on design.

Span & Height: Customizable to fit specific site needs.

 

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

 

 

1.Main beam

1)Function
Acts as the primary horizontal support for the hoist trolley.

Transfers lifting loads from the hoist to the crane legs.

Must be strong and rigid to withstand bending and shear forces.

2)Design and Structure
Usually fabricated from steel I-beams or box beams.

Box beam main beams are preferred for higher strength and torsional rigidity.

The beam length (span) depends on the working area and client requirements.

The beam must be designed to minimize deflection under load.

 

2.Lifting System

1)Core Components
Hoist: The main lifting device that raises and lowers the load.

Trolley: Moves the hoist horizontally along the main girder.

Wire Rope or Chain: Connects the hoist hook to the hoist mechanism.

Hook Block: Attached to the wire rope or chain, used to lift loads.

2)Types of Hoists Used
Electric Wire Rope Hoist:

Suitable for medium to heavy loads.

Provides smooth lifting with precise control.

Often equipped with multiple speeds, brakes, and overload protection.

Electric Chain Hoist:

Typically used for lighter loads.

Compact and cost-effective.

Easier maintenance compared to wire rope hoists.

3)Hoist Features
Lifting Capacity: Ranges based on design; typical mobile gantry cranes use hoists from 1 ton up to 20+ tons.

Lifting Height: Defined by wire rope length and trolley clearance.

Braking System: Electromagnetic or mechanical brakes to hold the load securely.

Overload Protection: Sensors or load cells prevent lifting loads beyond rated capacity.

Limit Switches: Upper and lower limit switches to prevent over-hoisting or over-lowering.

4)Trolley System
Mounted on rails or tracks fixed to the main beam.

Moves the hoist along the girder span.

Powered by an electric motor and gearbox.

Controlled via pendant or wireless remote.

3.End carriage

1)Function
Supports the main girder and connects it to the crane legs.

Houses the wheels that allow the entire crane to move along the ground or rails.

Transfers loads from the girder to the wheels and then to the ground.

2)Structure & Design
Usually made of welded steel plates forming a sturdy frame.

Designed to accommodate wheel assemblies (either rubber tires for ground movement or steel wheels for rail travel).

Must be rigid enough to withstand bending and twisting forces during crane operation.

                                         

4.Crane travelling mechanism

Travel Wheels:

Mounted on the end carriages.

Can be rubber-tired for smooth concrete floors or steel wheels for rails.

Equipped with bearings for smooth rotation.

Travel Motors:

Electric motors that drive the wheels via gearboxes.

Provide sufficient torque for moving the crane with its load.

Gearboxes:

Reduce motor speed to a suitable wheel speed and increase torque.

Typically worm gearboxes or helical gearboxes.

Drive Axles:

Connect the gearbox output to the wheels, transmitting power.

Brake Systems:

Electromagnetic or mechanical brakes on travel motors or wheels to hold the crane stationary when needed.

5.Trolley travelling mechanism

Trolley Wheels:

Mounted on the trolley frame.

Typically made of steel with precision bearings for smooth rolling.

Designed to run on the top flange or rails of the main girder.

Travel Motor:

An electric motor powers the trolley movement.

Often paired with a gearbox to reduce speed and increase torque.

Gearbox:

Usually worm or helical type.

Provides torque multiplication and speed reduction for controlled trolley motion.

Drive System:

The motor drives one or more trolley wheels via the gearbox and drive shaft.

Control System:

Controlled by pendant or wireless remote.

Allows forward and backward movement of the trolley.

Brakes:

Electromagnetic or mechanical brakes are fitted on the motor shaft or gearbox output to hold the trolley in position when stopped.

Limit Switches:

Installed at both ends of the main girder.

Prevent the trolley from running off the beam ends, enhancing safety.

6.Crane wheel

Types of Wheels
Steel Wheels:

Designed to run on steel rails.

Commonly used for outdoor gantry cranes or heavy-duty applications.

Durable and capable of handling heavy loads.

Require well-maintained rails for smooth operation.

Rubber-Tired Wheels:

Designed for travel on concrete or paved surfaces.

Provide better grip and reduce floor wear.

Quieter operation and better shock absorption.

More flexible movement without needing rails.

7.Crane Hook

1)Function
The hook is the primary lifting attachment that connects the crane's hoist to the load.

It securely holds, lifts, and moves loads during crane operation.

2)Types of Hooks
Standard Crane Hook:

Made of forged steel or alloy steel for high strength.

Designed with a safety latch to prevent load slippage.

Usually swivel hooks, allowing rotation to align load.

Specialized Hooks:

Grab hooks, clevis hooks, or custom hooks for specific load types.

May include heavier-duty designs for particular industries.
 

8.Motor

1)Purpose
Provides mechanical power for the crane's various movements:

Crane traveling (moving the entire gantry)

Trolley traveling (moving the hoist along the main girder)

Lifting (hoist operation to raise and lower loads)

2)Types of Motors Used
Electric Motors (most common):

AC Motors:

Squirrel cage induction motors for durability and reliability.

Often used for crane travel and trolley movement.

DC Motors:

Offer excellent speed control and torque.

Less common nowadays due to maintenance requirements.

Motor Specifications:

Rated power depends on load capacity and speed requirements.

Typically designed for heavy-duty, intermittent duty cycles.

.

9.Sound and light alarm system & limit switch

1)Sound and Light Alarm System
Purpose:

Warns personnel in the crane working area about crane movements to enhance safety.

Alerts nearby workers during lifting, trolley travel, or crane travel operations.
2)Limit Switches
Purpose:

Prevent the crane or trolley from moving beyond safe operational boundaries.

Protects the crane structure, hoist, and load from damage.

10.Safety Devices

1)Overload Protection Device
Prevents lifting loads exceeding the crane's rated capacity.

Uses load sensors or load cells integrated into the hoist.

Automatically stops lifting when an overload is detected.

Protects the crane structure and enhances operator safety.

2)Limit Switches
Lifting Limit Switch: Prevents over-hoisting or over-lowering of the hook.

Trolley Limit Switch: Stops trolley travel at girder ends.

Crane Travel Limit Switch: Stops crane travel at runway ends or safe zones.

3)Emergency Stop Button
Located on control panels and pendant controls.

Immediately cuts power to all crane motions when pressed.

Provides quick shutdown in emergencies.

4)Anti-Collision Devices
Used in environments with multiple cranes or obstacles.

Sensors detect proximity to other cranes or structures.

Automatically slow down or stop crane movement to avoid collisions.

5)Braking Systems
Electromagnetic or mechanical brakes on hoist, trolley, and crane travel motors.

Ensure the crane holds position when stationary.

Engage automatically during power failure or emergency stop.

11.Control Mode

1)Pendant Control
A wired handheld control device connected to the crane via cable.

Allows the operator to control all crane movements: lifting, trolley travel, and crane travel.

Features buttons or joysticks for precise control.

Common in smaller or medium-sized gantry cranes.

2)Wireless Remote Control
Provides operator freedom to move around the work area.

Controls all crane functions via radio signals.

Equipped with safety features like emergency stop buttons.

Ideal for larger workspaces or when visibility is better from different positions.

3)Cabin Control
Operator sits inside a cabin mounted on the crane.

Controls via joysticks, pedals, and buttons.

Offers excellent visibility and comfort for long operations.

Less common for mobile single girder gantry cranes due to their size but used in heavy-duty or specialized cranes.

4)Semi-Automatic / Automatic Control
Incorporates programmable logic controllers (PLCs) for automated sequences.

Used in specialized applications requiring repetitive or precise movements.

Can integrate with sensors for position feedback and safety interlocks.

5)Features of Control Systems
Multi-speed control for smooth operation.

Emergency stop and safety interlocks.

Overload and limit switch integration.

User-friendly interfaces for ease of operation.

Sketch

Main technical

 

 

1. Flexibility and Mobility
Easily movable on wheels, allowing operation in different locations without fixed rails.

Suitable for outdoor and indoor use on flat surfaces.

2. Cost-Effective
Generally lower cost compared to double girder or fixed gantry cranes.

Simplified design means less material and lower manufacturing costs.

3. Space Saving
Single girder design is more compact and lighter, requiring less headroom.

Ideal for facilities with limited vertical space.

4. Easy Installation and Maintenance
Quick to set up and dismantle due to lighter structure.

Easier access for routine maintenance and inspections.

5. Versatile Applications
Suitable for a wide range of industries, including warehouses, workshops, construction sites, and small manufacturing plants.

Can handle medium to light lifting tasks efficiently.

6. Good Load Capacity
Capable of lifting moderate loads (typically up to 20 tons) with reliable performance.

7. Improved Safety
Equipped with modern safety devices such as overload protection, limit switches, and alarms.

Reduces risks in material handling operations.

 

1. Construction Sites
Lifting and moving construction materials like steel beams, concrete blocks, and equipment.

Ideal for temporary use due to easy mobility.

2. Warehouses and Storage Yards
Handling pallets, containers, and heavy goods.

Efficiently moves materials across open areas.

3. Manufacturing Facilities
Assisting in assembly lines by transporting parts and finished products.

Loading and unloading heavy components.

4. Shipyards and Ports
Loading/unloading cargo in smaller docks or container yards.

Handling materials where fixed cranes are impractical.

5. Maintenance and Repair Workshops
Lifting engines, machinery parts, or tools for repair work.

Provides flexible lifting solutions within workshops.

6. Outdoor Storage Areas
Managing bulk materials, pipes, and construction equipment.

Suitable for uneven terrain when equipped with appropriate wheels.

 

 

1. Design & Engineering
Determine specifications based on customer requirements (load capacity, span, height, etc.).

Create detailed engineering drawings and structural calculations.

Select appropriate materials and components.

2. Material Procurement
Source high-quality steel, motors, electrical components, wheels, and other parts.

Verify material certifications and standards compliance.

3. Fabrication of Components
Main Beam Fabrication: Cutting, welding, and machining steel plates and sections.

End Carriages and Legs: Welding and assembly of structural frames.

Wheels and Axles: Machining and assembly according to design.

4. Surface Treatment
Clean and prepare all steel components.

Apply rust-proof coatings, primers, and paint according to specifications.

5. Assembly
Assemble the main beam, end carriages, legs, and wheels.

Install motors, gearboxes, brakes, and control systems.

Mount the hoist and trolley system on the main girder.

6. Electrical Wiring
Install wiring for motors, control panels, alarms, and limit switches.

Connect pendant or wireless control devices.

7. Quality Control and Inspection
Perform dimensional checks and structural integrity tests.

Conduct electrical tests and functional trials of motors and controls.

Test safety devices, brakes, alarms, and limit switches.

8. Load Testing
Perform no-load and full-load tests.

Verify lifting capacity, traveling, and trolley operation.

Document results and make necessary adjustments.

9. Final Inspection & Packaging
Final quality checks and certification.

Clean and package the crane components for shipment.

Prepare manuals, drawings, and maintenance guides.

10. Delivery & Installation Support
Ship the crane to customer site.

Provide installation assistance or supervision.

Offer training for operators and maintenance personnel.

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%.