Knowledge
How to Avoid the Risks of Oblique Lifting and Tilting During European Single-Beam Overhead Crane Operations
In European single-beam overhead crane operations, oblique lifting and tilting can easily lead to equipment overload, track wear, and safety accidents. These risks can be mitigated through the following measures:
I. Precise Planning and Inspection Before Operation
1. Clarify Lifting Parameters: Before operation, confirm the weight, center of gravity, and binding points of the lifted object to ensure that the lifting equipment's load capacity matches the load. Overloading is strictly prohibited. For example, select steel ropes of the appropriate specifications based on the weight of the lifted object to avoid breakage due to insufficient lifting equipment strength during oblique lifting.
2. Check Equipment Status: Focus on checking whether the lifting mechanism, braking system, and running track are functioning normally. If the brake fails or there are height deviations in the track, it may cause the lifted object to sway during operation, inducing oblique lifting.
II. Standardized Operating Procedures and Postures
1. Vertical Lifting Control: During lifting, ensure that the lifting equipment and the lifted object are vertical. Dragging or oblique lifting is strictly prohibited before the lifted object is completely off the ground. For example, the operating handle should be raised slowly, observing whether the lifted object is lifted smoothly. If tilting occurs, stop immediately, adjust the binding points, and then resume operation.
2. Running Trajectory Calibration: When the overhead crane moves, the lifted object must be kept parallel to the track, avoiding adjusting the position of the lifted object through oblique lifting. If the direction of the lifted object needs to be changed, first lower the lifted object to a safe height, and then achieve the change through horizontal movement of the overhead crane or rotation of the lifting equipment, rather than forcing oblique lifting.
III. Environmental and Signal Coordination Management
1. Work Area Organization: Ensure that the work area is free of obstacles to avoid tilting caused by the lifted object colliding with obstacles. For example, clear debris around the track to ensure a clear path for the overhead crane and prevent the lifted object from snagging and causing oblique lifting.
2. Unified and Clear Signals: The commanding personnel must use standard hand gestures or walkie-talkie commands to maintain synchronization with the operators. Operation is strictly prohibited when signals are unclear or multiple conflicting instructions are given, to avoid oblique lifting caused by misunderstandings in operation.
IV. Equipment Technology Optimization and Protection
1. Limit Device Application: Utilize devices such as lifting height limiters and running limiters to restrict abnormal movement of the lifted object. For example, when the lifted object tilts to a certain angle, the limiter can trigger an alarm or stop the machine to prevent the oblique lifting from worsening. 2. Anti-sway system assistance: Some European-style single-girder overhead cranes are equipped with an electronic anti-sway function. This system monitors the swing of the lifted object using sensors and automatically adjusts the operating speed to reduce the risk of oblique lifting and swaying. This function can be activated during operation to improve operational stability.
V. Personnel Training and Emergency Handling
1. Enhanced operational training: Operators must undergo professional training to understand the hazards of oblique lifting and swaying and learn avoidance techniques, such as using simulated training to learn how to assess the balance of the lifted object at the moment of lifting.
2. Emergency response mechanism: If the lifted object is found to be tilted, immediately stop the lifting and movement actions, slowly lower the object to a safe position, readjust the rigging method, and strictly prohibit continuing the operation by force.
Through the above measures, the risk of oblique lifting and swaying can be reduced from the aspects of operational procedures, equipment optimization, and environmental management, ensuring the safe and efficient operation of European-style single-girder overhead cranes.
