3 Ton Overhead Crane | Single Girder Underhung Bridge Crane
Short Video Description
This video shows a 3 ton overhead crane with a single girder underhung bridge crane design, equipped with a low headroom electric chain hoist for indoor material handling.
The 3 ton underhung overhead crane, also called an under running bridge crane, underslung crane or underhung bridge crane, travels along the bottom flange of the runway beams. This arrangement is suitable for workshops where the building structure and available headroom require a compact crane configuration.
The crane uses a single girder bridge with a compact electric chain hoist. The low headroom hoist helps reduce the vertical space required between the runway and hook, providing better usable lifting height in buildings with limited clearance.
Compared with a conventional top-running overhead crane, a single girder underhung crane can make better use of existing roof structure and may allow the crane to operate below the runway beam without requiring a separate heavy runway support system.
The final 3 ton underhung overhead crane design depends on the lifting capacity, span, lifting height, runway beam, building structure, working frequency and required hook approach.
Main Technical Specifications
| Item | Technical Specification |
|---|---|
| Crane type | 3 Ton Single Girder Underhung Overhead Crane / Under Running Bridge Crane |
| Rated capacity | 3 ton |
| Bridge design | Single girder underhung bridge |
| Runway arrangement | Crane travels underneath the runway beam using an under-running end carriage configuration |
| Hoist type | Low headroom electric chain hoist |
| Hoist arrangement | Compact electric chain hoist suspended from the underhung trolley |
| Span | 6 – 20 m, customized according to workshop layout and runway structure |
| Lifting height | 3 – 12 m, customized according to required hook height |
| Hoisting speed | 2 – 8 m/min, customized according to application |
| Crane travelling speed | 10 – 30 m/min, VFD available |
| Duty class | ISO A3 – A5 / FEM 1Am – 2m, selected according to working frequency |
| Control | Pendant control / Radio Remote Control |
| Power supply | 380V / 50Hz / 3Ph standard; 400V, 415V, 440V, 460V and 60Hz available |
| Safety devices | Overload protection, upper and lower lifting limit switches, crane travelling limit switches, emergency stop and buffers |
| Working temperature | Typically -20°C to +40°C, customized for special environments |
| Applications | Workshops, warehouses, maintenance areas, machinery plants, assembly lines, production facilities and light industrial handling |
| Yuantai Crane engineering experience | Yuantai engineers check the underhung runway beam, bridge girder, end carriages, low headroom chain hoist, wheel loads and building structure as one complete crane system. |
What Is a Single Girder Underhung Bridge Crane?
A single girder underhung bridge crane is an overhead travelling crane whose bridge travels underneath the runway beams. It is also commonly called an under running overhead crane, underhung crane or underslung bridge crane.
The bridge girder is suspended below the runway system, allowing the crane to use the lower flange of the runway beam for travelling. This can be useful in buildings where the existing structural arrangement favors an under-running crane system.
For a 3 ton underhung overhead crane, the runway beam and supporting structure must be checked for wheel loads, span, travel loads and the actual building structure before installation.
Why Use a Low Headroom Electric Chain Hoist?
The main advantage of a low headroom electric chain hoist is its compact vertical size. It can reduce the distance between the crane bridge and lifting hook compared with some conventional hoisting arrangements.
This is useful when the workshop has limited headroom and the customer needs to maximize the available lifting height.
For a 3 ton single girder underhung crane, the hoist, bridge girder, runway beam and hook height should be considered together rather than selecting the chain hoist independently.
3 Ton Underhung Crane vs Top Running Overhead Crane
| Item | Single Girder Underhung Crane | Top Running Overhead Crane |
|---|---|---|
| Bridge position | Bridge runs underneath the runway beams | Bridge travels on top of runway rails |
| Runway arrangement | Under-running runway system | Top-running runway system |
| Hoist | Low headroom electric chain hoist | Electric chain hoist or wire rope hoist |
| Building suitability | Useful for certain existing structures and limited-clearance buildings | Common in conventional crane buildings |
| Hook height | Can be optimized through compact underhung and low headroom design | Depends on girder and hoist configuration |
| Typical application | Light and medium material handling | General industrial material handling |
Advantages of a 3 Ton Single Girder Underhung Overhead Crane
A 3 ton underhung overhead crane can provide several advantages when the building structure is suitable for an under-running system.
- Compact single girder bridge design
- Low headroom electric chain hoist
- Good use of existing runway structure
- Suitable for limited-clearance workshops
- Flexible crane travelling coverage
- Practical solution for light and medium material handling
Where Is a 3 Ton Underhung Bridge Crane Used?
The 3 ton single girder underhung bridge crane is suitable for many indoor applications, including:
- Machine manufacturing workshops
- Maintenance and repair workshops
- Warehouses
- Assembly plants
- Production lines
- Fabrication workshops
- Equipment maintenance areas
How to Select a 3 Ton Low Headroom Underhung Crane?
Start with the 3 ton lifting capacity, span and required lifting height. Then check the building height, runway beam dimensions, available headroom and required hook approach.
Because the crane travels underneath the runway, the supporting beam is particularly important. Yuantai engineers check the runway beam, wheel loads, bridge structure, end carriages and building support before confirming the final design.
For limited-clearance workshops, the low headroom electric chain hoist can be selected to maximize the available hook height within the existing building.
FAQ: 3 Ton Single Girder Underhung Bridge Crane
Common questions about 3 ton underhung overhead cranes, low headroom electric chain hoists, runway beams and under-running bridge crane systems.
1. What is a 3 ton single girder underhung overhead crane?
A 3 ton single girder underhung overhead crane is a bridge crane with one main girder that travels underneath the runway beams. It is also called an under running bridge crane or underslung crane.
The crane is commonly used for indoor material handling where the building structure is suitable for an under-running runway system.
2. Why use a low headroom electric chain hoist?
A low headroom electric chain hoist has a compact vertical design that can help increase the usable hook height.
It is particularly useful for workshops where the distance between the runway and roof is limited.
3. What is the difference between an underhung and top-running crane?
An underhung crane travels underneath the runway beam, while a top-running overhead crane travels on top of runway rails.
The correct system depends on the existing building structure, runway arrangement, crane capacity, wheel loads and available headroom.
4. Is a 3 ton underhung crane suitable for a low-clearance workshop?
Yes. A 3 ton low headroom underhung crane can be a good solution for a low-clearance workshop when the building and runway structure can support the crane.
The compact bridge and low headroom chain hoist can help maximize usable lifting height.
5. What should be checked before installing an underhung crane?
Check the runway beam size, support structure, span, wheel loads, building clearance, lifting height and travelling distance.
The existing building structure should be reviewed before the crane is manufactured and installed.
6. What information is needed for a 3 ton underhung crane quotation?
Provide the 3 ton capacity, crane span, lifting height, runway beam dimensions, runway length, building height, available headroom, working frequency and power supply.
A workshop drawing or photos of the existing runway structure can help Yuantai engineers determine the suitable underhung crane configuration.
7. What experience does Yuantai Crane have with underhung cranes?
Yuantai Crane has engineering experience with single girder overhead cranes, underhung bridge cranes, low headroom hoists and customized runway systems.
For an underhung project, Yuantai engineers consider the bridge girder, end carriages, wheels, runway beams, chain hoist, wheel loads and building structure as one complete system.
Need a 3 Ton Single Girder Underhung Bridge Crane?
Send us your 3 ton lifting capacity, span, lifting height, runway beam dimensions, runway length, building height, available headroom and workshop layout.
Yuantai Crane can engineer a 3 ton single girder underhung overhead crane with low headroom electric chain hoist for workshops requiring compact crane dimensions, efficient space utilization and practical indoor material handling.
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Article by Bella ，who has been in the hoist and crane field since 2016. Bella provides overhead crane & gantry crane consultation services for clients who need a customized overhead travelling crane solution.Contact her to get free consultation.
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- Crane type:_____ . (e.g., overhead crane, gantry crane, jib crane)
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