In heavy industrial plant outdoor lifting operations, steel material storage yards, and large component transportation tasks, portal-type lifting equipment with large load capacity, stable structure, and suitable for outdoor working conditions can optimize the material circulation process in the plant and reduce the pressure on manual lifting operations. The MH-25 is a standard track-mounted single-girder portal crane that is compatible with a rated lifting load of 25 tons. It belongs to a medium-load general-purpose portal crane, adheres to national standards for production and inspection of lifting equipment, is suitable for outdoor lifting operations in large and medium-sized industrial and mining plants, building material storage yards, construction sites, and steel structure plants, taking into account both lifting capacity and site compatibility. It is a commonly used lifting equipment for the regular transportation of medium and heavy materials.
I. Overall Structure and Operating Principle of MH-25
The MH-25 is constructed using thick steel sections welded together. It consists of an enhanced portal main girder, reinforced steel legs, dual sets of ground beams for movement, medium-load electric hoists, integrated electrical control system, and all-round safety protection components. Compared to smaller-tonnage portal cranes, the thickness of the main girder web and the cross-sectional area of the legs have been upgraded and optimized. The overall load-bearing and force distribution is more balanced, and the wheel pressure values are stable. It is suitable for specialized track laying for hardened ground operations. The equipment moves longitudinally on the fixed ground track and is equipped with a MD-type medium-load electric hoist that slides laterally along the main girder. It is combined with a winch lifting structure to complete a complete closed-loop operation of vertical lifting, horizontal transfer, and fixed-point unloading.
The model parameters have clear industry recognition. MH refers to the electric hoist single-girder portal structure, 25 represents the rated lifting tonnage. The equipment is compatible with an operating span of 15 meters to 36 meters, a standard lifting height of 4 meters to 20 meters, and is suitable for outdoor working temperatures ranging from -25 degrees Celsius to 40 degrees Celsius. It can withstand outdoor rain erosion, dust erosion, and changes in day-night temperature differences, and is suitable for continuous outdoor lifting operations. The working level is compatible with the A4 frequency of lifting operations in the plant.
II. Core Advantages of MH-25
Upgrade in load-bearing structure, stronger outdoor operation stability. The legs are equipped with bidirectional reinforced diagonal braces, and the main girder has an internal reinforcing structure, enhancing the overall wind resistance and lateral stability. In normal outdoor windy conditions, the equipment can operate smoothly without any body shaking or offset. The surface of the equipment is sprayed with thick anti-corrosion and rust-proof paint, which is resistant to oxidation and sandstone wear, suitable for long-term outdoor placement, reducing structural loss caused by rust on the paint surface, and extending the service life of the equipment.
Multiple operation control modes, higher operational controllability. It is equipped with both wired ground control and wireless remote control modes. Remote control can remotely control the start-stop, turning, and lifting of the equipment. This avoids the risk of personnel approaching heavy objects closely during operation and is suitable for the control of large and heavy material lifting. The equipment is equipped with a soft start-stop control module, which is gentle in lifting, moving, starting, and stopping, effectively reducing the swing amplitude of the heavy object and the impact and wear on the equipment body. It is suitable for the smooth lifting of precise components and heavy steel materials.
Flexible adaptability, controllable operation costs. The body supports single-arm, double-arm, and closed non-arm customization modifications, meeting the different operation requirements of single-side loading, double-side unloading, and closed-site operations. The modular assembly design of the equipment has strong component interchangeability, convenient disassembly and transportation, and can be quickly disassembled and reassembled during project relocation or site modification without large-scale site foundation renovations. The transmission components of the equipment are compatible with standard general accessories, making maintenance procurement convenient and reducing the difficulty of daily maintenance.
III. Main Adaptation Operation Scenarios of MH-25
The steel structure processing plant is the core application site. The finished steel frames, profiles, and welded components in the steel structure workshop have a relatively heavy self-weight. Small-tonnage lifting equipment cannot meet the lifting requirements. The MH-25 can complete the material feeding of raw materials, loading of finished products, and cross-zone transportation within the workshop, adapting to the frequent large-piece lifting processes in the plant and improving the production circulation efficiency of the workshop. The MH-25 is highly compatible with large steel and prefabricated component storage areas, as well as stone storage areas, concrete prefabricated components sites, and steel logistics parks. It can complete the loading and unloading of thick-walled pipes, steel plates, and prefabricated piers by using MH-25 for handling. With its large-span operation range, it covers a wide range of storage areas, eliminating the need to frequently move equipment and enabling quick loading and unloading operations by trucks.
This equipment is also suitable for medium and large-scale construction sites and industrial buildings. It is used for hoisting heavy construction templates, support steel frames, and motor and generator components in road and bridge projects, as well as for hoisting large pump bodies and crushing equipment components in mining sites. The equipment does not need to be installed in a closed factory building; it can be put into use by simply laying down tracks, and is suitable for long-term project hoisting operations.
V. MH-25 Compliance Operating Standards and Daily Maintenance Key Points
During on-site operations, it is necessary to adhere to the equipment operation guidelines. Before operation, check the track gravel and debris, and inspect the braking sensitivity of the traveling wheels. The hoisting operation should comply with the rated load standard. Do not pull heavy objects diagonally or lift unevenly. Keep the heavy objects securely tied to maintain the center of gravity. In extreme weather conditions such as strong winds, rain, and snow, stop outdoor hoisting, lock the traveling braking device, fix the position of the electric hoist, and avoid potential safety hazards.
Regular maintenance can reduce the occurrence of faults. At the end of each day's operation, clean the main beam and the attachments of the traveling mechanism of sand, dust, and gravel. Add special lubricating grease to the traveling wheels, pulleys, and coupling every month to reduce mechanical friction loss. Regularly check the wear of the steel wire rope, the locking of the hook, and the integrity of the outer skin of the lines. Replace aging and easily worn parts in a timely manner. After rainy season operations, dry the water stains on the electrical control terminals, take measures to prevent moisture in the circuit, and avoid circuit faults caused by moisture.
During the selection and installation stage, it is necessary to conduct a preliminary survey of the site's foundation bearing capacity, select compliant load-bearing tracks, and preferentially use original factory-matched electric hoists and electrical control components to ensure the coordinated compatibility of the entire machine's transmission and braking, reducing operational faults caused by mismatched parts, and ensuring stable long-term hoisting operations in the factory area.
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