Mechanical Workshop Single Girder Gantry Crane

 

A mechanical workshop single girder gantry crane is a highly efficient and versatile material handling solution designed for lifting, moving, and positioning heavy components within a workshop environment.
A single girder gantry crane consists of a single horizontal beam (girder) supported by two legs that move on rails or wheels. It is equipped with a hoist-either electric or manual-mounted on a trolley that travels along the girder.

 

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

The main beam (also called the girder) of a mechanical workshop single girder gantry crane is the central load-bearing structure that supports the hoist and allows it to travel horizontally.
Function:
Carries the hoist and the load during operation, and transfers the lifting force to the end carriages or legs of the gantry crane.
Type:
Single girder – only one horizontal beam across the span of the crane.

 

2.Lifting System

Electric Hoist:The main lifting unit that includes a motor, gearbox, drum, and wire rope or chain.
Lifting Motor:Powers the hoist; may include brake system for holding the load.
Drum:Rotates to reel in or release the lifting rope or chain.
Wire Rope / Chain:Lifting medium; strong, durable, and load-rated.
Hook Block:Includes hook, pulley, safety latch; connects directly to the load.
Limit Switch:Prevents over-lifting or over-lowering, protecting the system.

3.End carriage

The end beam of a mechanical workshop single girder gantry crane is a critical structural component that connects the main beam to the supporting legs or wheels and allows the crane to move along its travel path. It plays a key role in structural support, mobility, and load transmission.

                                         

4.Crane travelling mechanism

The crane traveling mechanism of a mechanical workshop single girder gantry crane is the system that enables the horizontal movement of the entire crane structure along the ground track or shop floor, allowing it to carry loads from one location to another efficiently.
What Is the Crane Traveling Mechanism?
It refers to the driving system installed on the gantry legs or end beams, typically consisting of:
Travel wheels
Drive motor and gearbox
Brakes and couplings
Electrical control (for motorized type)
This mechanism moves the entire gantry crane (not just the hoist) along the workshop aisle or shop rails.

5.Trolley travelling mechanism

The crane traveling mechanism refers to the system that enables the entire gantry crane to move forward and backward along its track or floor space. It is responsible for transporting the crane (including main beam, hoist, and trolley) across the working area of the mechanical workshop.

This mechanism ensures that the load can be carried along the length of the workshop, complementing the trolley's lateral (cross-travel) movement.

6.Crane wheel

The wheel of a mechanical workshop single girder gantry crane is a critical component that supports and enables the movement of the entire crane structure along its path. These wheels are mounted on the end carriages or gantry legs, and can either roll along rails (rail-mounted) or directly on the workshop floor (trackless type with rubber wheels).
Function of Crane Wheels
Support the full weight of the crane and the load.
Enable longitudinal travel of the crane within the workshop.
Guide movement along a defined path (rails or flat surface).
Transmit motion from the travel drive motor to movement.

7.Crane Hook

The hook of a mechanical workshop single girder gantry crane is a critical lifting component that directly connects the load to the crane. It must be strong, safe, and reliable, as it bears the entire weight of the lifted object during operation.
Function of the Hook
Connects the hoist wire rope or chain to the load.
Allows easy attachment and detachment of slings, chains, or lifting devices.
Rotates and pivots to align with the load.
Supports safe, stable lifting and lowering of machinery, engines, and parts in a workshop setting.

8.Motor

The motor of a mechanical workshop single girder gantry crane is a vital driving component that powers different movements of the crane-specifically the lifting, trolley traveling, and crane traveling functions. Each motion usually uses a separate motor, selected based on the required load capacity, speed, and operating environment.

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9.Sound and light alarm system & limit switch

1)Sound and Light Alarm System
Purpose:
Warn nearby personnel that the crane is starting or moving.
Enhance safety by alerting operators and workers in the workshop.
Prevent accidents by providing clear audible and visual signals.
2)Limit Switch System
Purpose:
Prevent crane, trolley, or hoist from moving beyond safe operational limits.
Protect the crane structure, equipment, and operators by stopping motions at boundaries.
Avoid damage caused by over-travel or over-lift.

10.Safety Devices

1)Overload Protection Device
Function: Prevents the crane from lifting loads exceeding its rated capacity.

How: Load sensor or load cell detects the lifting weight; when overloaded, it triggers an alarm and blocks lifting operations.

Benefit: Avoids structural damage, hoist failure, and accidents due to excessive load.

2)Limit Switches
Crane Traveling Limit Switch: Prevents crane from moving beyond end stops on runway rails.

Trolley Traveling Limit Switch: Stops trolley travel at girder ends.

Hoist Upper and Lower Limit Switch: Prevents over-lifting or over-lowering of the hook.

Benefit: Avoids collisions, mechanical damage, and rope slack hazards.

3)Emergency Stop (E-Stop) Button
Function: Instantly cuts power to all crane motions when pressed.

Placement: On pendant control, remote control, and/or operator cabin.

Benefit: Provides immediate shutdown capability during hazardous situations.

4)Sound and Light Alarm System
Function: Alerts nearby personnel when the crane is starting or moving.

Components: Audible buzzer and visual flashing light.

Benefit: Improves situational awareness and prevents accidents.

5)Anti-Sway Control System (Optional)
Function: Reduces load swing during starting, stopping, or travel.

How: Uses variable frequency drives (VFDs) and control algorithms.

Benefit: Improves load stability, reduces wear, and enhances safety.

6)Brake System
Hoist Brake: Electromagnetic or spring-applied brake that holds the load when power is off.

Travel Brake: Holds crane/trolley in position when stopped.

Benefit: Prevents unintentional load or crane movement.

11.Control Mode

Additional Control Features
Emergency Stop: Cuts all power immediately.

Load Moment Indicator: Alerts operator if overload occurs.

Interlocks: Prevent conflicting motions (e.g., trolley travel while hoisting).

Travel Limit Switch Integration: Auto-stop at travel ends.

Feedback Signals: For motor speed, position, and diagnostics.

Sketch

Main technical

 

1. Space Efficiency
Requires less vertical clearance compared to double girder cranes.

Ideal for workshops with limited headroom or lower ceilings.

Compact design fits well in confined mechanical workshop spaces.

2. Cost-Effective
Lower manufacturing and installation costs than double girder cranes.

Less steel used in main beam and structure reduces material expenses.

Simpler design means easier and cheaper maintenance.

3. Flexibility
Can be designed as rail-mounted or trackless (rubber-tyred) to suit various workshop floor conditions.

Suitable for indoor workshops and covered bays.

Easily customized to specific span, capacity, and travel requirements.

4. Ease of Installation and Maintenance
Lighter components simplify transportation and assembly.

Single girder structure allows easier access for inspection and maintenance.

Fewer parts mean reduced downtime and repair costs.

5. Good Load Handling for Moderate Capacities
Typically designed for capacities from 1 ton up to around 20 tons.

Sufficient for most mechanical workshop lifting needs, such as engine assembly, tooling handling, and machine maintenance.

6. Improved Operator Visibility
Single girder design offers better sightlines under the crane.

Enhances safety and precision during load handling and placement.

7. Lower Operating Energy Consumption
Lighter crane mass reduces energy needed for traveling and hoisting.

Motors can be smaller and more efficient.

8. Suitable for Customization
Compatible with different control modes: pendant, wireless remote, cabin.

Can be equipped with various safety devices (alarms, limit switches, overload protection).

Adjustable speeds with VFDs for precise control.

 

1. Manufacturing Plants
Handling heavy raw materials and finished products.

Loading/unloading machinery parts, metal sheets, and fabricated components.

Assembly line assistance for medium-duty lifting.

2. Warehouses and Storage Yards
Moving heavy pallets, containers, and equipment.

Stacking and organizing goods efficiently.

Facilitating loading/unloading trucks or railcars.

3. Construction Sites
Transporting construction materials like steel beams, concrete blocks, and large pipes.

Assisting in erection of structures and scaffolding.

4. Shipyards and Ports
Handling cargo containers, heavy ship parts, and loading/unloading vessels.

Maintenance tasks involving heavy equipment handling.

5. Automotive Industry
Lifting engines, chassis, and large components during vehicle assembly or repair.

6. Metal Fabrication and Steel Industry
Moving heavy coils, plates, and fabricated steel components.

Supporting welding, cutting, and assembly operations.

 

 

1. Design and Engineering
Requirement Analysis: Define capacity, span, lift height, travel distances, control mode, and workshop constraints.

Structural Design: Design main girder, end carriages, legs, and connections according to relevant standards (ISO, FEM, GB).

Mechanical Components Selection: Choose motors, hoists, wheels, brakes, control system, safety devices.

Electrical Design: Control panel layout, wiring diagrams, power supply design.

Drawings and Approval: Prepare detailed fabrication and assembly drawings, get client approval.

2. Material Procurement
Purchase steel plates, profiles, motors, gearboxes, wheels, electrical components, and safety devices.

Verify material certifications and quality documents.

3. Steel Fabrication
Cutting: Steel plates and profiles cut to size using plasma, laser, or flame cutting.

Forming: Bending or rolling steel as per design.

Welding: Assemble main girder, end carriages, and legs using MIG or manual welding.

Machining: Machine mounting holes, wheel seats, bearing seats, and flange surfaces.

Heat Treatment: Stress relieving welding distortions if required.

4. Surface Treatment
Grinding: Smooth weld seams and surfaces.

Cleaning: Remove rust, oil, and contaminants.

Painting: Apply primer and finish coats (usually epoxy or polyurethane paint) for corrosion protection.

5. Component Assembly
Install wheels, bearings, hoist, motors, brakes, and electrical devices on the crane structure.

Assemble control panel and wiring.

6. Testing and Quality Control
Dimensional Inspection: Check all critical dimensions.

Load Testing: Perform rated load and overload tests according to standards.

Function Testing: Verify smooth operation of hoist, trolley, crane travel, brakes, and safety devices.

Electrical Testing: Check control circuits, emergency stops, alarms, limit switches.

Documentation: Prepare test reports and certificates.

7. Packaging and Delivery
Disassemble parts if needed for transport.

Protect components with rust preventatives and packaging materials.

Arrange shipping to customer site.

8. Installation and Commissioning (at customer site)
Assemble crane on site (main girder, legs, wheels).

Align rails or prepare floor surface.

Connect electrical power and controls.

Perform on-site testing and operator training.

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%.