The working time of a hydraulic chain hoist in coal mines depends on several factors, including the quality of the components, the maintenance and inspection schedule, the operating conditions, and the workload.

Under ideal conditions and with regular maintenance, a well-designed and high-quality hydraulic chain hoist can last for many years of reliable service. However, coal mine environments can be harsh and challenging, with dust, moisture, and other contaminants that can affect the performance and durability of the equipment.

To ensure optimal performance and extend the working life of the hydraulic chain hoist, it is essential to follow the manufacturer's recommended maintenance schedule, regularly inspect and replace worn or damaged components, and operate the equipment within its designed capacity and specifications.

In general, the working time of a hydraulic chain hoist in coal mines cannot be precisely predicted without considering these factors. Therefore, it is crucial to closely monitor the equipment's condition and performance and take prompt action when necessary to ensure safe and reliable operation.