Precautions for Operating a Single-Chain Electric Hoist

A crane is a type of lifting machinery characterized by cyclic and intermittent motion. A typical work cycle comprises the following steps: the lifting attachment raises the load from its pickup location, moves it horizontally to the designated placement position where the load is lowered, and then returns in the reverse direction to bring the lifting attachment back to its original position for the next cycle. Electric hoist cranes with single-chain operation are primarily categorized into single-girder cranes, single-girder suspended cranes, double-girder cranes, wall-mounted cranes, cantilever cranes, gantry cranes, and manual gantry cranes. In single-girder cranes equipped with electric hoists operating on a single chain, the electric hoist, end beams, trolley and bridge, drive motors, and electrical control equipment are all manufactured in China, while the steel structure—including the main girder—is also domestically produced. Over the past decade, thousands of industrial cranes have been supplied to Chinese customers.

It can be used for loading and unloading goods in workshops, warehouses, open-air storage yards, and other similar settings. Common types include girder cranes, bridge cranes, gantry cranes, cable cranes, and transport bridges. A jib crane consists of a vertical column and a cantilever; the cantilever can either rotate about a fixed column mounted on the base, or be rigidly connected to a rotating column and rotate together with the vertical central axis of the base support. Jib cranes are suitable for applications requiring relatively small lifting capacities and where the operating area is circular or sector-shaped. They are typically used for clamping and handling workpieces, such as those in machine tool operations.

Column-type cantilever cranes in China typically use chain-driven electric hoists as both the lifting and operating mechanisms for small-capacity models, with wire-rope electric hoists and chain hoists being used less frequently. Rotation and horizontal travel are mostly operated manually; electric operation is employed only when the lifting capacity is relatively large.

How to install and operate a single-girder, explosion-proof electric hoist? When using an explosion-proof electric hoist, users must operate it in accordance with the prescribed duty cycle and avoid frequent use. For explosion-proof electric hoists with lower lifting speeds, it is especially important to monitor the brake friction temperature rise and ensure it does not exceed the national standard. The permissible values for T4 group as specified in Clause 4.1 of GB3638.1-83 and in the instruction manual are based on the assumption that the operating system is followed and the equipment is used frequently. Failure to comply may result in hazards—users must take note!

If the wire rope is found to have come off the sheave or become tangled, the rope guide must be removed first; only after the wire rope has been thoroughly cleaned may it be reassembled and further cleaned. Strict adherence to operating procedures and rigorous compliance with scrapping criteria are essential. The wire rope must be used safely and in good condition. Wire ropes used at room temperature should be inspected at least every Lubricate once every 10 days. Use an appropriate tool (such as a stiff brush or a clean motherboard) to apply the grease evenly along the wire rope. In winter, when temperatures are low, Need Heat the lubricating oil. After use, the explosion-proof electric hoist shall be parked in the designated location, and the hook shall be raised to a height of 2 meters above the ground. It is essential to ensure that the explosion-proof electric hoist is adequately lubricated with clean oil free from impurities and dirt. Simultaneous pressing of two buttons that operate the hoist in opposite directions is strictly prohibited. During operation, take precautions to prevent and avoid the generation of hazardous sparks that could ignite explosive mixtures.