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HAND CHAIN BLOCK Iran

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HAND CHAIN BLOCK

Manual chain hoists are typically constructed from structural carbon steel ST37 or ST52 with tensile strength of 370 to 520 MPa. Their standard lifting capacity ranges from 0.5 to 20 tonnes. The main boom is often telescopic with a maximum length of 6 meters. The lifting system consists of a gear and an alloy steel chain, Grade 8, with a minimum breaking strength of 800 MPa. The gear ratio in the manual mechanism is designed between 1:15 and 1:30 for mechanical advantage. The base is equipped with cast iron wheels, 150 to 300 mm in diameter. These wheels can withstand a static load up to 4 times the rated capacity.

The hoist structure features a welded H-shaped or triangular frame base. The boom angle is typically adjustable up to 75 degrees. Safety is ensured by mechanical locks at joints and an automatic load brake on the drum. The steel wire rope is of type 6x19 with a steel core and a minimum safety factor of 5:1. The units self-weight ranges from 50 to 400 kg depending on capacity. An epoxy or galvanized coating increases corrosion resistance to over 500 hours in salt spray test. Ideal load positioning accuracy is within ±2 cm.


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HAND CHAIN BLOCK

A manual hoist is a mechanical tool for moving heavy loads in industrial, workshop, and construction environments, relying on human force. It is made of durable steel with industrial or powder coating, with load capacities ranging from 0.5 to 5 tons. The internal gear system, with gear ratios from 4:1 to 6:1, multiplies operator force, allowing lifting of heavy loads. High-strength steel chains with diameters of 6 to 12 mm are used, equipped with an automatic mechanical brake for safe load stopping.

Structurally, the manual hoist features top and bottom hooks with safety latches and hardened steel pins to prevent accidental load drops. Gears and internal shafts are precision machined to reduce play and stress concentration. Chain length and lifting height are adjustable, with stable operation in temperatures from −20°C to +50°C. This hoist is widely used in warehouses, production lines, construction projects, and light industries, ensuring high safety and durability.