(1) The deviation of the position of the girder center line from the designed positioning axis shall not be greater than 5 mm. The alignment of the girder’s center line is crucial as it serves as the central axis for the entire crane structure. Even a minor deviation exceeding 5 mm can cause misalignment of […]

(1) The deviation of the actual centerline of the track from the actual centerline of the crane girder shall not be greater than 10 mm. Precise alignment of these centerlines is fundamental. In large industrial workshops where cranes operate continuously, any misalignment here can lead to uneven stress distribution on the crane structure during movement. […]

The static load test shall be carried out according to the following procedures and requirements. Park the crane at the column. First, start the hoisting mechanism to conduct no-load lifting and lowering operations, and make the trolley run back and forth along the whole journey. This no-load trial operation shall be carried out no less […]

The winter maintenance of construction machinery is of great significance. Especially in the northern regions where winters are long and the temperature remains low for extended periods. When construction machinery is used in winter, the cold climate can easily lead to difficulties in starting internal combustion engines, freezing of cooling water and electrolyte, intensified wear […]

The reasons for the downward deflection of the main girder of overhead cranes are multifaceted and should be analyzed according to specific circumstances. Generally speaking, issues can arise from design, manufacturing, transportation, installation, and use. (1) The Impact of Unreasonable DesignIn the past, China followed the Soviet standards. The static stiffness of the main girder […]

Regardless of the type of machinery, different lubricating oils are prohibited from being mixed for use, and reducers are no exception. For reducers, the positions of the oil level plug, drain plug, and breather are determined by their installation locations. When it comes to the use, inspection, and maintenance of the lubricating oil in reducers, […]

(1) Requirements for Elastic Base Plates The elastic base plates are made of rubber sheets, and their properties should meet the following requirements: a Shore hardness of 70 – 80 degrees, a tensile strength greater than 130 kg/cm², an elongation at break greater than 300%, and a compressive elastic modulus of 700 – 1200 kg/cm². […]

The installation of crane tracks is a crucial process that ensures the proper alignment and operation of overhead cranes. The following detailed steps outline the installation procedure: 1. Line Marking Using the crane girder’s positioning axis as a reference, deploy a theodolite to establish baseline points. At a distance of 60mm from the track centerline, […]

Introduction Grounding is an essential aspect of crane safety, ensuring the protection of both personnel and equipment from electrical hazards. Proper grounding mitigates the risks of electric shock, fire, and equipment damage by providing a reliable path for electrical currents to flow safely into the earth. This guide provides a comprehensive overview of grounding requirements […]

I. Unified Signals for Operators and Signal Personnel Gantry crane operators and signal personnel must use standardized and unified signals to ensure effective communication and coordination. Operators should ascend or descend the control cabin using designated ladders. Before engaging the power supply, the controller must be turned to the neutral position. The cabin floor should […]