Product Definition
Second-hand tower cranes refer to those that have been put into use but still meet the conditions for safe operation. As common vertical transportation equipment on construction sites, their steel structure tower bodies can be raised along with the increase of the building. Through the horizontal rotation of the boom and the movement of the luffing trolley, materials can be lifted and transported in three-dimensional space. This type of equipment usually undergoes major depreciation when circulating in the second-hand market, and its price is only 20% to 40% of that of a new machine, making it an ideal choice for small and medium-sized construction enterprises.
Basic Parameter Characteristics
The lifting capacity of mainstream second-hand tower cranes is usually between 2 and 32 tons. The standard boom length covers a range of 30 to 80 meters, and the independent height can reach 40 to 60 meters. With attachment devices, they can climb to a height of over 200 meters. The lifting mechanism mostly adopts frequency conversion control, with a speed adjustment range of 5 to 100 meters per minute. The slewing mechanism can achieve smooth operation at 0.6 to 1 revolution per minute. The electrical system generally retains the original factory's overload protection, limit switches and other safety devices.
Structural Features
Modular steel structure
The tower body composed of standard sections can be flexibly increased or decreased in height, and the boom adopts a triangular or rectangular cross-section tube truss structure.
01
High space utilization
The tower body occupies a small area and is particularly suitable for dense construction site layout.
02
The lifting system is retained
Most second-hand equipment still has the original factory hydraulic lifting frame, which can achieve the self-lifting function.
03
Complete safety protection
Key monitoring devices such as torque limiters, weight sensors, and anemometers are retained.
04
Core Advantages
Outstanding economic performance
The procurement cost is only about one-third of that of a new machine, and the lifespan of the main steel structure is usually over 70% remaining.
Strong adaptability
By replacing the standard sections and attachment devices, it can meet the construction requirements of buildings of different heights.
Simple maintenance
The mechanical structure is relatively stable, the main components have strong universality, and the maintenance technology is mature.
Stable efficiency
Maintain the original designed lifting speed and positioning accuracy, meeting the requirements of modern construction progress.
Functional Characteristics
Precise hoisting
Millimeter-level positioning accuracy is achieved through a variable frequency control system, making it suitable for the installation of prefabricated components.
Large-scale coverage
Horizontal rotation in coordination with the movement of the luffing trolley forms a three-dimensional working space.
Load adaptation
Equipped with multi-speed moment limits, it can intelligently adjust the lifting capacity at different amplitudes.
Environmental monitoring
Retain safety functions such as wind speed alarm and tilt monitoring to ensure the safety of equipment in bad weather.
Typical Applications
High-rise Buildings
High-altitude operations such as concrete pouring, steel structure installation, and curtain wall construction.
01
Industrial Plants
Heavy operations such as hoisting of large equipment and installation of roof systems.
02
Infrastructure Construction
Bridge pier and column construction, large-scale formwork assembly and other projects.
03
Construction of Special Structures
Chimneys, cooling towers and other super-tall buildings.
04
Prefabricated Buildings
Precise installation of components such as prefabricated wall panels and stairs.
05
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