The factors that affect the quality of chain hoist chains involve multiple dimensions such as materials, manufacturing processes, design parameters, usage conditions, maintenance, standard certification, and operating specifications. The specific analysis is as follows:

1、 Material quality and performance

Material selection: The chain is usually made of high-strength alloy steel (such as 20Mn2, 25MnV, CM490/CM690 manganese steel or stainless steel), which needs to have high tensile strength, wear resistance, and corrosion resistance. For example, a 100 level chain has better strength than an 80 level chain and a higher safety factor (usually 4-6 times).

Material defects: Cracks, inclusions, surface defects, etc. in raw materials can directly affect the fatigue life and fracture resistance of the chain. Analysis by the National Chain Quality Inspection Center shows that the breakage of the outer chain plate is mostly caused by original material defects.

2、 Manufacturing process and quality control

Heat treatment process: Quenching, tempering and other heat treatments can improve the hardness and toughness of the chain (such as HRC45-50), and enhance its impact resistance. Improper craftsmanship may lead to uneven hardness or increased brittleness.

Welding and Forming: Chain weaving, welding (such as fully automatic welding machines), and calibration processes affect the accuracy and strength of the chain. Welding defects such as porosity and lack of fusion can reduce the load-bearing capacity of the chain.

Surface treatment: Polishing, blackening, galvanizing, electroplating with hard chromium or chemical nickel plating can enhance corrosion resistance and wear resistance. For example, electroplating a hard chromium layer can form a wear-resistant protective film, reducing the wear of the chain plate and sprocket.

3、 Design parameters and structural optimization

Link diameter and pitch: The larger the link diameter, the stronger the load-bearing capacity; The smaller the pitch, the better the flexibility. The design needs to balance strength and flexibility, such as optimizing the cross-sectional shape (such as an 8-shape) of a 14 × 42 specification chain (with a chain link diameter of 14mm and a pitch of 42mm) to disperse stress and improve tensile strength.

Standard compliance: Following international standards such as ISO3077, EN818, AS2321, etc., to ensure that the mechanical properties, testing methods, and load-bearing capacity of the chain comply with the specifications.

4、 Usage conditions and environmental impact

Load and operation: Improper operations such as overloading, diagonal pulling, emergency stop and start, and impact loads can accelerate the fatigue fracture of the chain. Trial lifting (check stability at a height of 10-20cm from the ground) and prohibiting overloading are key safety measures.

Environmental factors:

Temperature and humidity: High temperatures may cause chain brittleness, while low temperatures may lead to chain brittle fracture; High humidity or corrosive environments (such as acid and alkali, salt spray) can easily cause rust and chemical structural changes.

Dust and impurities: Dust and sand particles entering the gaps between the chain links will intensify wear, and dusty environments such as mines and construction sites will accelerate chain wear.

Ultraviolet radiation and temperature difference: Long term direct sunlight or drastic temperature changes may damage the surface structure and internal metal properties of the chain.

5、 Maintenance and Storage Requirements

Daily maintenance: Clean the dust and oil stains on the surface of the chain after use, apply anti rust lubricating grease (focus on lubricating the joints of the chain links); Regularly inspect for cracks, deformation, and wear (if the diameter wear of the chain link exceeds 5% or the tensile rate exceeds the standard, it needs to be scrapped).

Storage environment: Store in a dry, ventilated, and non corrosive gas environment, avoid spreading or hanging on sharp objects, and prevent chain ring deformation. Long term storage requires the application of rust proof oil and regular static and dynamic load tests.

6、 Standard certification and accessory quality

Standards and certifications: Chain quality that complies with international standards (such as ISO, DIN, ASME) and certifications (such as CE) is more guaranteed. Different levels (such as level 80, level 100) correspond to different safety factors and applicable scenarios.

Matching of accessories: The matching and quality of the chain with the hook, sprocket, and connecting components (such as split pins and spring clips) directly affect the overall performance. The precision of the sprocket and the strength of the connecting components must be consistent with the strength of the chain.

7、 Operating standards and personnel factors

Operating standards: Operators must comply with safety regulations, such as prohibiting standing under heavy objects, avoiding diagonal pulling and hard pulling, and maintaining the center of gravity of the suspended object on the same vertical line as the hook. Clear signals are required for communication and coordinated actions when collaborating with multiple people.

Personnel training: Operators are required to wear protective equipment such as safety helmets, gloves, goggles, etc. When working at heights, they must wear safety belts and receive regular safety training to ensure that their skills and safety awareness meet the standards.

The main equipment produced by Hebei Makita: stage electric hoist, electric chian hoist, wire rope electric hoist，Hand chain hoist, lever hoist, pneumatic hoist and other lifting equipment