What are the national standard acceptance criteria for overhead cranes?

[SanEmery]

Overhead crane national standard acceptance criteria are as follows: Overhead crane stairs, walkways, and operator cab standards: Items in the operation room should be placed according to fixed-position requirements; equipment should be intact and tidy, with various electrical wires bundled neatly and aesthetically. Walls should be clean, and ceilings should be free of dust accumulation. The floor inside and outside the operation room should be kept clean, free of paper scraps, cigarette butts, or debris. Windows should be clean, and lighting fixtures should be dust-free; lighting facilities should be intact and tidy, with posted or hanging items harmoniously unified with their surroundings. Overhead crane stairs and walkway floors should be level, free of garbage, cigarette butts, paper scraps, or spittle, kept clean and unobstructed; stair handrails and steps should be dust-free and free of oil stains. Overhead crane mechanical beam 6S operation standards: Mechanical doors should not be locked; floors and related facilities should be kept clean and dust-free on the surface, with daily inspections conducted and recorded in the . Hazardous areas should have "Special Warning Signs" and warning lines marked on the floor to prevent others from approaching. Each area should have demarcation lines and , with standardized fonts and clean surfaces. Various items placed within the demarcation lines should be neatly arranged and must not exceed (or press against) the lines.

[SanDavid]

From the perspective of engineering acceptance, the national standard acceptance of overhead cranes requires thorough inspection of several key items. The manufacturer must provide complete documentation including the certificate of conformity, drawings, and installation manuals. The qualifications of the installation unit must also be verified. The rail spacing should be measured with a tape measure to check tolerances, and all obstacles within the travel range of the main and auxiliary trolleys must be cleared. The installation position of the end buffers must be precise. Static load testing is mandatory, involving lifting 1.25 times the rated load for 10 minutes, with the bridge deflection not exceeding 1/700 of the span. Dynamic load testing should be conducted with 1.1 times the load, involving repeated lifting, lowering, and traveling operations, ensuring no abnormal noise from all gearboxes. Safety devices such as load limiters and limit switches in all directions must be triggered on-site more than three times, and emergency stop buttons must be installed in conspicuous locations. Finally, do not forget to measure the track grounding resistance, which should be less than 4 ohms.

[VonElaina]

I have participated in over a dozen factory crane acceptance tests, where the national standards focus on mechanical performance and safety protection. For the mechanical part, first check the main beam camber by using a theodolite to measure whether the no-load upward deflection value falls between 0.9‰ to 1.4‰ of the span. All wheels must simultaneously contact the track; if rail gnawing occurs, adjust the levelness. The wire rope arrangement on the drum must not overlap, with at least two safety loops remaining. The brake shoe clearance should be controlled within 0.5mm, and the brake pads must fully separate when released. The lowering distance of the hoisting mechanism is critical: when suspending a 1-ton load for 10 minutes, the lowering must not exceed 100mm. All protective covers must be intact, and the operator's cabin must be equipped with a fire extinguisher. Finally, have the operator test-run the crane: the control handle's zero-position self-return function must be responsive, and the emergency stop response on the console must be within one second.

[LeKiara]

The most critical aspect of overhead crane national standard acceptance is the electrical inspection. Use a megohmmeter to measure the insulation resistance of the circuit, which must be greater than 1.5MΩ at room temperature. The power supply test for the main trolley conductor rail must be conducted, with spark levels not exceeding grade 2 throughout the entire travel. Monitor the motor temperature rise with an infrared thermometer, ensuring it does not exceed 60°C after continuous operation for 1 hour. Special attention must be paid to the lighting circuit, which must have an independent power supply, and emergency lights must remain lit for at least 15 minutes during a power outage. All metal enclosures must be tested for protective grounding using a ground resistance tester, with readings less than 4Ω. The insulation rubber mat in the operator's cabin must be at least 3mm thick and must fully cover the driver's foot position. The wiring labels in the electrical cabinet must exactly match the drawings, and the terminal block tightening torque must comply with specifications.