(1) crack;
(2) The wear of dangerous section reaches10% of the original size;
(3) The opening is increased by15% compared with the original size;
(4) The torsional deformation of the hook exceeds10;
(5) Plastic deformation of dangerous section or hook neck of hook;
(6) The hook wire is corroded;
(7) When the wear of the hook bushing reaches 50% of the original size, the bushing should be replaced;
(8) When the wear of the hook mandrel reaches 5% of the original size, the mandrel should be replaced.
Legal basis: Article 36 of the Law of People's Republic of China (PRC) on Work Safety: The design, manufacture, installation, use, testing, maintenance, modification and scrapping of safety equipment shall conform to national standards or industrial standards.
Production and business units must carry out regular maintenance and inspection of safety equipment to ensure normal operation. Maintenance, maintenance and testing shall be recorded and signed by relevant personnel.
Production and business units shall not shut down or destroy the monitoring, alarm, protection and life-saving equipment and facilities directly related to safety production, and shall not tamper with, conceal or destroy their relevant data and materials.
Where production and business units in catering and other industries use fuel gas, they shall install combustible gas alarm devices and ensure their normal use.