Detailed explanation of the quality inspection process for stage chain hoists

　　1、 Appearance inspection

　　The first step is to conduct a visual inspection. The inspectors will carefully inspect the shell of the chain hoist for scratches, dents, deformations, and other conditions. The hook should have no cracks or deformations, and the surface should be smooth without burrs. The chains should be arranged neatly, without twisting or knotting, and the links should be tightly connected. At the same time, check whether the installation of each component is firm and whether there is any looseness. Appearance inspection is the first level of quality testing to ensure that the chain hoist has no obvious defects in appearance.

　　2、 No load test

　　After passing the appearance inspection, conduct a no-load test. Hang the chain hoist, pull the zipper bar, and observe if the hoist runs smoothly. The chain should have no jamming or jumping during the pulling process, and the various transmission components of the hoist should operate flexibly. At the same time, check the performance of the brake. When stopping to pull the chain, the brake should be able to brake quickly and reliably to prevent heavy objects from slipping. The no-load test can preliminarily test the mechanical and operational performance of the chain hoist.

　　3、 Load testing

　　Load testing is a crucial step in quality inspection. Select appropriate heavy objects for loading testing based on the rated load of the chain hoist. Gradually increase the load weight and observe the operation of the chain hoist under different loads. The chain should be able to withstand the weight of the load without significant elongation or deformation. The transmission components should maintain stable operation without abnormal noise and vibration. The brake should also be able to reliably brake under load conditions to ensure safety. Load testing can verify the actual load-bearing capacity and safety performance of the chain hoist.

　　4、 Safety device inspection

　　Stage chain hoists are usually equipped with safety devices such as overload protection devices, limiters, etc. The inspectors will check whether these safety devices are working properly. The overload protection device should automatically start when the load exceeds the rated value to prevent damage to the hoist due to overload. The limiter should be able to accurately limit the lifting and lowering height of the hoist to prevent collision accidents. The inspection of safety devices is to ensure that in case of accidents, the chain hoist can take timely protective measures to ensure the safety of personnel and equipment.

　　5、 Durability testing

　　In order to test the durability and reliability of the chain hoist, a certain number of cyclic tests will be conducted. Simulate actual usage scenarios and repeatedly perform operations such as loading, unloading, lifting, and lowering. After a certain number of cycles, check whether there is wear, fatigue, or other phenomena in the various components of the chain hoist. Durability testing can evaluate the performance stability of chain hoists during long-term use.

　　6、 Packaging inspection

　　In the final stage of quality inspection, the packaging of the chain hoist will also be inspected. The packaging should be firm and complete, effectively protecting the chain hoist from damage during transportation and storage. The packaging should indicate the product's model, specifications, production date, manufacturer, and other information for easy identification and use by users.