For lifting capacities as substantial as 20 tons, crane hoists must be robust, reliable, and efficient. Various types of hoists can handle such a significant load, each suited to different industrial applications and environments. Here’s a detailed look at common types of 20-ton crane hoists:
Electric Wire Rope Hoists: These are the most common type of hoists used for heavy-duty applications due to their durability and high load capacity. Electric wire rope hoists are ideal for environments that require precise lifting and variable speeds. They use a drum to wind the rope, capable of lifting heavy loads smoothly over large vertical distances.
Electric Chain Hoists: While less common at this higher capacity, electric chain hoists that can handle up to 20 tons are used where fine lifting control and lower speeds are preferred. They are simpler in design compared to wire rope hoists and are used in applications where durability and ease of maintenance are critical.
Pneumatic Chain Hoists: Known for their ruggedness and reliability, pneumatic chain hoists are used primarily in automotive, manufacturing, and heavy machinery industries, especially in areas where electrical sparking poses a risk (explosive environments). These hoists are powered by compressed air, providing a high lifting capacity without the risk of electrical hazards.
Manual Chain Hoists: Although less frequent for such high capacities due to the physical effort required, manual chain hoists are still used for 20-ton loads, especially in temporary setups or in locations without power access. These devices are operated by hand and are valued for their simplicity and portability.
Trolley Hoists: Trolley hoists are equipped with a mechanism that allows the hoist to travel along a beam, enhancing the functionality of the hoist by allowing horizontal as well as vertical movement. For 20-ton capacities, these are typically motorized and can be integrated into more complex lifting systems like overhead cranes.
Gantry Crane Hoists: While technically part of the crane system, gantry cranes equipped with hoisting mechanisms capable of lifting 20 tons are used in shipyards, large outdoor manufacturing operations, and wherever massive objects need to be moved across significant distances.
Each of these hoist types has specific advantages, making them suitable for different lifting needs. When selecting a 20-ton hoist, factors such as the nature of the load, lifting height, operation frequency, environmental conditions, and available power sources should be considered to ensure optimal performance and safety.