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Let’s take a detailed look at the different categories of explosion-proof hoisting winches.

2022-07-07

　　Explosion-proof hoisting winches can be classified into two main categories based on their drive method: electric and hydraulic. The electric type, in turn, includes several subtypes: motor rotor external resistance speed control, motor stator pole-changing speed control, thyristor-based variable-frequency speed control, and single- or dual-motor differential speed control. The hydraulic type comprises four distinct approaches: low-speed, high-torque hydraulic motor direct-drive models; high-speed, low-torque hydraulic motor models connected via planetary gear reducers; planetary differential pump-controlled speed regulation systems; and those utilizing hydrodynamic couplers for control.

　　Electric explosion-proof hoists are typically configured by combining standard winches with explosion-proof electrical equipment. Countries such as the U.S., the UK, Japan, and Australia have been developing hydraulic winches since the 1970s, with these systems increasingly becoming larger in scale. For instance, the UK has introduced a series of hydraulic winches ranging from 15 kW to 225 kW, while Japan has pioneered explosion-proof lifting winches powered by low-speed, high-torque motors, reaching capacities of up to 250 kW.

　　The manufactured hydraulic winch drum reaches a diameter of 2.8 meters. In recent years, Germany has been using thyristor-based variable-frequency speed-controlled, explosion-proof electric hoists ranging from 150 to 200 kW—these systems feature simple electronic control units, compact designs, lightweight equipment, and excellent cooling performance. Meanwhile, China produced its first explosion-proof hoist equipped with an external rotor resistance system for speed control in 1980, also developing a low-speed, high-torque hydraulic explosion-proof winch that same year.

　　The drum diameter ranges from 1.2m to 2.5m; by the end of 1982, an explosion-proof motor compatible with the 1.2m winch had been developed and put into use; in 1985, a 1.2m explosion-proof winch equipped with a hydrodynamic coupling for speed control was completed. Research on explosion-proof winches driven by AC-AC frequency-conversion induction motors has also made significant progress, yet hydraulic winches remain the dominant choice.

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