BMH Semi-gantry Crane

Applications

This is single girder semi-gantry crane which uses electric hoist as the lifting mechanism.

Applied to outdoor place such as station, wharf, warehouse, yard, construction site, cement products factory, mechanical and structural assembly plant, hydropower station, etc. for lifting, transporting, loading, etc.

Forbid to use in the conditions as easily combustible, explosive, corrosive (acid, alkali, plating, steam, etc.).

Structure and Characteristics

   Mainly consists of bridge, crane traveling mechanism, lifting mechanism and electrical system, etc.

Bridge

Consist of main girder, upper beam, bottom beam, landing leg, ladder landing, etc.

Main Girder 

1. Main girder is the major bearing carrier of hoist style crane and also the runway of the electric hoist.

2. Welded by U-steel and I-beam which made of pressed steel.

3. Steel material is Q235B or Q345B (similar to foreign Fe37 or Fe52).

4. Bridge camber (F) is (1/1000～1.4/1000) S. Max. camber is located in the middle of span within S/10.

5. Electric hoist trolley travels on the flange of the I beam. When the hoist located in the middle of main girder, the full load natural frequency should no less than 2Hz.

6. The crane bumpers are installed on the both ends of the main girder to ensure the safety of trolley travelling.

Upper beam, bottom beam

1. Upper and bottom beams are the main basic support of the main girder and loading and also is the link between main girder and travelling mechanism. It is one of the principal bearing carrier of crane's metal structure.

2. Box structure is mainly welded by steel plate with the character of light, rigid, nice and good welding technology.

3. Bumpers are installed on the bottom of beam.

4. Upper beam locate above the upper rail and the bottom beam under the bottom rail.

5. Generally, the bottom beam is longer than upper beam and the length depends on the length and angle of landing leg.

Landing Leg

1. Consists of top flange, bottom flange and box structural support beams welded by steel plate.

2. The landing leg become conversion section structure which is big end up at the result of big top flange and small bottom flange. This structure can bear the loading of vertical and horizontal direction effectively.

3. Main girder and upper end beam are connected with bolt to modify the flange hanging connect structure. Simple structure, easy installation and convenient to transport and storage.

4. Main girder and the two legs which symmetrically arranged on the two sides of it are connected with bolts to fasten the two flanges. And the space between two legs become wide below narrow with a certain angle to shape kind of "A" structure, thus improve the stability.

5. The landing leg and bottom beam are connected with bolt.

Ladder Landing

Welded by angle steel, flat steel, round steel, etc. Connected with bolts and the angle steel that welded on the landing leg to avoid on-site welding. Easy assembly.