MHB Semi-Gantry Crane for Efficient Material Handling
Product Introduction
The MHB Type Semi-Gantry Crane (also known as MHB Type Single-Girder Semi-Gantry Crane or semi-gantry crane) is a compact medium- and small-capacity gantry crane with a distinctive "semi-gantry" configuration: one end runs on a floor-level rail via an outrigger, while the other end—without an outrigger—travels along an elevated runway girder mounted on the factory building structure. Compared with the standard MH Type gantry crane, the MHB Type eliminates the need for one outrigger and its associated floor rail foundation, making it an ideal choice where one side of the building can support the crane load—saving both investment and floor space.
The MHB Type offers a lifting capacity of 3 to 20 tons and spans from 7.5 to 22.5 meters, making it well suited for material handling and loading/unloading in general machinery workshops, assembly shops, warehouses, and similar facilities. It uses a CD1/MD1 wire rope electric hoist as the hoisting mechanism and is available with either floor-level pendant control or an operator's cab. The working environment temperature ranges from -25°C to +40°C. It is not intended for use in flammable, explosive, or corrosive atmospheres.
Product Specifications
- Product Name: MHB Type Semi-Gantry Crane (Single-Girder Semi-Gantry Crane)
- Model & Capacity: MHB Type, lifting capacity 3–20 tons (common ratings: 3/5/10/16/20t)
- Place of Origin: Xinxiang, Henan (Kelude Heavy Industry)
- Customization: Span, lifting height, and control method can all be customized to non-standard requirements
- Hoisting Mechanism: CD1/MD1 wire rope electric hoist
- Span Range: 7.5–22.5 meters (custom spans available)
Product Photos
The photos above show actual MHB Type Semi-Gantry Cranes in service. The semi-gantry configuration—one outrigger on a floor rail, with the opposite end supported by the factory's crane runway girder—delivers a compact footprint that saves valuable floor space.
Product Features
- Space-Saving Semi-Gantry Design: One end runs on a floor-level rail via an outrigger, while the other end rides directly on the factory's existing crane runway girder—eliminating the need for a second outrigger and foundation. This is particularly advantageous for retrofit projects where one side of the building already has a load-bearing runway.
- High Space Utilization: By removing one outrigger, the MHB Type occupies significantly less floor space than a standard full gantry crane, offering a more flexible equipment layout in space-constrained facilities.
- Cost-Effective: Saves 20%–30% in investment compared with a full gantry crane of equal capacity. Installation leverages the existing building structure, making it ideal for upgrading older workshops and facilities.
- Flexible Hoist Options: Choose between CD1 single-speed (8m/min) for general lifting or MD1 two-speed (8/0.8m/min) for precise positioning.
- Multiple Control Options: Available with wireless remote control, wired pendant control, or operator's cab—individually or in combination to suit site conditions.
- Broad Applicability: The ideal choice for semi-indoor/semi-outdoor applications, filling the gap between Electric Single-Girder Cranes (fully indoor) and full Gantry Cranes (fully outdoor).
Operating Principle
In the MHB Type Semi-Gantry Crane, one end of the main girder is supported by an outrigger and ground beam on a floor-level rail, while the other end rests directly on the elevated crane runway girder of the factory building via an end carriage—forming a stepped semi-gantry structure. The electric hoist traverses along the lower flange of the I-beam on the main girder, while the bridge travel mechanism drives the main girder longitudinally along the building.
Longitudinal Travel: The bridge travel mechanism on the outrigger side runs along the floor rail, while the end carriage on the opposite side travels along the factory's crane runway girder. Both sides are synchronized through the Electrical Control System.
Hoisting Mechanism: The CD1 electric hoist uses a Conical Rotor Motor driving a three-stage helical gear reducer to rotate the drum, which winds the wire rope to raise and lower the hook. On power failure, the cone brake engages automatically to ensure safe load suspension.
Product Structure
The MHB Type Semi-Gantry Crane consists of the following core components:
Main Girder Assembly: Box-type welded structure or H-Beam construction, fabricated from Q355B steel plate. One end of the main girder connects to the outrigger, while the other end mounts directly onto the factory's crane runway girder via the end carriage.
Outrigger System: Only one outrigger is provided (creating the height differential), made of Q235B or Q355B steel. The lower end of the outrigger is welded to a ground beam, which is secured to the floor rail foundation with Anchor Bolts. Outrigger height is determined by the factory's crane runway girder elevation to keep the main girder level.
Bridge Travel Mechanism: The outrigger side features a floor-driven travel unit (motor + gearbox + wheel block), while the non-outrigger side uses an end carriage travel mechanism running on the factory's crane runway girder. Both sides are speed-synchronized.
Electric Hoist: CD1/MD1 wire rope hoist, comprising a Conical Rotor Motor (with integral brake), three-stage helical gear reducer, drum, Wire Rope, and Hook block. It travels along the lower flange of the I-beam on the main girder.
Electrical Control System: Main Circuit Breaker, Contactors, Thermal Overload Relays, power-off limit switch, and Overload Limiter (optional). Control voltage is AC 36V safety voltage. Power is supplied via Enclosed Conductor Rail or cable.
Technical Parameters
MHB Type Semi-Gantry Crane – General Technical Parameters
| Parameter Item | MHB type Parameter |
| Lifting Capacity | 3~20 t(3/5/10/16/20tCommonly Used) |
| Span | 7.5~22.5 m(7.5/9/19/22.5mCommonly Used) |
| Lifting Height | 6~18 m(6/9/12/18mCommonly Used) |
| Work Duty / Classification | A3~A5 |
| Lifting Speed | 8 m/min(CD1)/ 8+0.8 m/min(MD1 Two-Speed) |
| Cross Travel Speed | 20 m/min |
| Long Travel Speed | 20 m/min |
| Power Supply | Three-phase AC 380V 50Hz |
| Operation Mode | Wireless remote control / Wired Pendant / Operator's Cab |
| Working Environment Temperature | -25℃~+40℃ |
| Structural Configuration | Semi-Gantry Frame(One Side Outrigger+Floor Crane Rail/Other Side Factory buildingcrane runway girder) |
Product Drawings
The drawings above show the reference dimensions for the MHB Type semi-gantry crane. Actual dimensions must be determined based on the lifting capacity, span, and the crane runway girder height of the factory building.
Typical Applications
- Machinery Manufacturing Workshops: Handling and loading/unloading of castings, forgings, and molds. The semi-gantry structure saves valuable workshop floor space.
- Assembly Workshops: Assembly and transfer of large equipment components, paired with an electric hoist for precise positioning.
- Warehouses & Storage Yards: Loading and unloading of packaged goods. An ideal solution for semi-indoor, semi-outdoor environments.
- Retrofitting Existing Factory Buildings: When an existing plant already has one bridge crane runway, adding a semi-gantry crane allows you to leverage the existing runway—saving on investment and speeding up the retrofit.
- Open-Air Storage & Canopies: For covered outdoor storage, the semi-gantry design is more compact and cost-effective than a full gantry crane.
Selection Guide
Light-Duty Applications: MHB Type, 3–5t, span 7.5–12m. Suitable for small workshops and warehouses. Reference price: RMB 30,000–80,000.
Medium-Duty General Applications: MHB Type, 5–10t, span 12–19m. Suitable for machinery manufacturing and assembly workshops. Verify that the factory crane runway girder has sufficient load capacity to handle the end carriage wheel loads. Reference price: RMB 80,000–180,000.
Heavy-Duty Applications: MHB Type, 10–20t, span 19–22.5m. Suitable for heavy-duty workshops and large warehouses. A structural review of the factory building is required to confirm the load margin of the crane runway girders and corbels. Reference price: RMB 180,000–350,000.
Selection Notes: The key to semi-gantry crane selection lies in the factory building conditions—you must confirm the rail height and load capacity of the existing crane runway girder. Please provide the lifting capacity, span, crane runway rail elevation, and rail model. The Kelude Heavy Industry technical team will provide a free selection proposal.
Operating Instructions
Pre-Operation Checks: Verify that the floor runway is clear of obstructions, the factory crane runway girder rail is in good condition, the wire rope shows no broken wires or strands, the brake clearance is correct, and the limit switches are responsive and reliable.
Operation: Perform a trial lift of 200mm before hoisting to confirm the brake is functioning properly. Pay close attention to the synchronization of the two sides of the semi-gantry—if the outrigger side and the end carriage side move at different speeds, stop the crane immediately and investigate. Never exceed the rated lifting capacity.
Shutdown Procedure: After completing work, raise the hook to the upper limit, park the trolley at the designated position, move the crane bridge to the anchoring area, and cut off the main power supply.
Maintenance: Inspect the floor runway and factory crane runway girder rail for wear and straightness on a monthly basis. Check the end carriage travel mechanism and brakes quarterly. Conduct a comprehensive annual safety inspection.
Why Choose Kelude Heavy Industry
Specialized Semi-Gantry Design: We thoroughly verify the load capacity and rail specifications of your factory crane runway girder to ensure a safe and reliable semi-gantry structure. The outrigger height is precisely matched to the factory elevation, and the levelness of the main girder is guaranteed.
Extensive Retrofit Experience: We have extensive experience in retrofit projects—such as adding lifting equipment to aging factory buildings or extending coverage where a bridge crane runway already exists on one side. We provide structural inspection and reinforcement recommendations for existing buildings.
Full-Process Service: Free site survey, factory structural assessment, foundation design, manufacturing, installation & commissioning, operator training, and after-sales support. Phone response within hours, on-site service within 48 hours.
Service & Support
Kelude Heavy Industry provides full life-cycle support for MHB Type semi-gantry cranes: free site survey, factory structural assessment, manufacturing, installation & commissioning, operator training, and annual maintenance. For more models, technical parameters, and quotation, please call 13903802779 or contact our online sales team. We respond within 24 hours.
Need a selection proposal or quotation for the MHB Type semi-gantry crane?
Feel free to contact the Kelude Heavy Industry sales and technical team. We provide free design proposals and technical consultation.
FAQ
Q: What is the difference between the MHB Type semi-gantry crane and the MH Type full gantry crane?
A: The MHB Type features a semi-gantry structure—one side has an outrigger that runs on a floor-level rail, while the other side has no outrigger and instead rides directly on the factory crane runway girder. The MH Type is a full gantry structure—both sides have outriggers running on floor-level rails. The MHB Type eliminates the need for one outrigger and its foundation, saving 20%–30% in cost, but it requires an available crane runway girder on one side of the building and a structural assessment of the building's load capacity.
Q: Which national standards does the MHB Type semi-gantry crane comply with?
A: The MHB Type semi-gantry crane is designed, manufactured, and inspected in accordance with the following Chinese national standards: GB/T 3811 (Crane Design Specifications), GB/T 14405 (General-Purpose Gantry Crane), GB/T 5905 (Crane Testing Procedures and Specifications), GB/T 6067 (Safety Rules for Lifting Appliances), and TSG Q7015 (Special Equipment Safety Technical Regulation for Crane Installation, Retrofit, and Repair). The hoisting mechanism uses a wire rope electric hoist that complies with GB/T 3811 and JB/T 9008.1 (Electric Hoist Technical Conditions).
A: The MHB Type Semi-Gantry Crane is designed in accordance with JB/T 5663-2008 "Hoist Gantry Crane" standard. The semi-gantry structure references GB/T 14406-2011 "General-Purpose Gantry Crane". The hoisting mechanism complies with JB/T 9008.1 "Wire Rope Hoist". Installation supervision and inspection are carried out per TSG Q7014, and safety protection is configured per GB/T 6067 "Safety Rules for Lifting Appliances".
Q: What are the factory building requirements for installing an MHB Type Semi-Gantry Crane?
A: There are three key requirements: ① The factory building must have a usable crane runway girder rail on one side — the rail height determines the levelness of the main girder and the outrigger height; ② The crane runway girder and column brackets must have sufficient load-bearing margin to withstand the end carriage wheel load; ③ The column spacing must match the crane span. A structural review of the factory building is required before installation. Kelude Heavy Industry offers free on-site assessment.
