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Content and Regulations for Load Testing and Inspection of Electric Hoist Gantry Cranes
Release time:
2021-05-07
European-style cranes are widely used in foreign-funded enterprises and new national projects, effectively achieving the goal of reducing building height and saving investment. Due to their maintenance-free design, they save a significant amount of maintenance costs during subsequent use. The motor power is only about 40% of the original, demonstrating a clear energy-saving effect.
NLH type European electric hoist bridge crane
European cranes are widely used in foreign-funded enterprises and new national projects, effectively reducing the height of factories and saving investment. Due to the maintenance-free design, a large amount of maintenance costs can be saved during subsequent use, and the motor power is only about 40% of the original, showing significant energy-saving effects.
*NLH type European electric hoist bridge crane
Lightweight, low clearance, effectively saving building resources, small hook limit, large working area, using high-quality components, low maintenance workload; fewer transmission links, high transmission efficiency, low failure points; the hook has a swing prevention function, precise positioning, and improved efficiency.
HD type electric single beam crane
HD European electric single beam is lightweight, low wheel pressure, small limit dimensions, reliable performance, and easy operation. Low wheel pressure and small limit dimensions can reduce the initial investment in factory construction, with low noise and low energy consumption, making it energy-saving and environmentally friendly.
*HD type electric single beam crane
Durable, reducing repair and maintenance costs.
The trolley adopts a compact design, allowing the hook to lift higher and closer to the factory track, increasing the working range of the hook.
Only after the no-load test run is normal can the load test run be conducted. The load test run is divided into static and dynamic types, starting with static load testing, followed by dynamic load testing.
Inspection content of the load test.
The quality of bolt connections and welding at various joints of the crane's metal structure, mainly focusing on the quality of the main end beam connections.
The strength and rigidity of mechanical equipment, metal structures, and lifting devices, as well as the strength of the crane's steel track.
The brake should operate flexibly and reliably.
The reducer should be noise-free.
The lubrication of lubricated parts should be good, and the bearing temperature should not exceed the specified limit.
All mechanism components should operate smoothly without vibration; if there are defects, they should be repaired before inspection.
Static load test, electric hoist lifting rated load.
After running back and forth several times along the full length of the bridge frame, move the electric hoist to one end of the bridge frame and find the zero position line on the measuring column (i.e., the actual height of the beam at this time).
Measure static stiffness: Move the electric hoist to the middle of the bridge frame, lift the rated load with the crane hook, leaving the ground 100-200mm, and suspend for 10 minutes. At this time, measure the deflection of the main beam or bridge frame; the deflection of the main beam of A5 grade crane should not exceed L/700.
After passing the rated load test, conduct a test with 25% of the rated load. The method for overload testing is the same as for the rated load test, with the qualification condition being no permanent deformation after the test. The test can be conducted three times, with the result of the third test being the standard.
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