Main Structure and Characteristics

The structure mainly consists of four parts: bridge frame, trolley, travelling mechanism, and electrical equipment. The main hook is used to lift liquid molten steel, and the aux hook is used to lift other heavy objects; it is not allowed to lift two objects at the same time. The main and secondary hooks shall not exceed their respective rated lifting capacity when working independently, and the simultaneous lifting work shall not exceed the rated lifting capacity of the main hook.

Bridge Frame

  • Double main girders, welded box girders, arch by national standards
  • Steel plate material Q235B or Q345B (similar foreign steel Fe37 or Fe52)
  • The main girder is made of orthogonal box girder or off-gauge large box structure
  • The main beam cross-section is optimized by computer, making it lighter in weight while ensuring good strength and stiffness.
  • Electrical equipment arranged in the main beam
  • End beams are categorized into rigid end beams and articulated end beams
  • Rigid end-beam interfaces are high-strength bolted, and articulated end-beam interfaces are pinned.
  • Rigid end beams are "dollar-shaped" and horizontal straight beams.

Other Features

  • Walking platforms, platforms, railings, ladders, etc., are designed and manufactured according to relevant safety regulations and design specifications.
  • Platform walkways have protection boards with a height of not less than 90mm and railings with a height of not less than 1050mm.
  • To avoid radiation from steel water and reduce the service life of the main girder, the bottom of the main girder is provided with a heat insulation layer (the heat insulation layer consists of rock wool and steel plates).
  • The trolley conductive slide frame adopts I-beam steel conductive, ensuring safe and reliable performance and easy maintenance.
  • A large car conductive line access cage and a large car conductive line blocking frame are installed.

Trolley

  • Composed of motor, reducer, brake, coupling, wheel, reel, etc.
  • Adopting a special motor for metallurgical lifting, insulation class H.
  • Equipped with two sets of independently acting brakes (double brakes)
  • The trolley is a double-drive structure, and the gears at all levels of the reducer are medium-hardened.
  • Using 6W (19) high-strength, line contact metal core steel wire rope, with a safety factor in line with ≥ 6

Crane travelling Mechanism

  • Consisting of a drive unit and wheel unit
  • The drive unit consists of an electric motor, brake, reducer, etc.
  • The wheel unit consists of an active wheel unit and a driven wheel unit.
  • The drive device is set on the base of the main beam in the four corners of the bridge at the lower cover plate, driving the active wheels to make the crane run, known as the "four corners of the drive" mode.

Electrical System

  • The electrical room of the main beam is insulated with rock wool and equipped with a chiller inside.
  • Sealing and dust-proofing of electronic control equipment, along with heat insulation and temperature reduction.
  • High-temperature-resistant cables are used for the mobile power supply of the operating trolley.

Applications

  • Steel mills

Metallurgical Environmental Analysis

High-temperature dust is easily generated due to smelting, casting, heat treatment and other processes. Among them, the room temperature in the plant can reach 40-60 degrees Celsius on average, and the radiation temperature of the molten metal on the spreader can reach up to 300 degrees Celsius. Moreover, in the process of smelting, casting and heat treatment, some water vapor will be generated, and some corrosive gases will also be generated, resulting in high humidity and high corrosive air environment, which will accelerate the corrosion of metal structures. Therefore, casting cranes in the design, must take into account the above environmental factors, to avoid the image of the environment on the life and performance of the crane.

Features

Due to a high risk level, ladle cranes are designed with special safety features to ensure the efficiency and safety of crane system. The features of ladle cranes are as follow:

  • Double sets of independent action brakes is installed to the lifting mechanism.
  • Heavy hammer and rotary lifting position limiters is installed and down position limiter will be installed when crane hoisting height is more than 20 m.
  • Over speed protection equipment is stalled.
  • Fault protection devices, such as, positive and negative contactor is installed to prevent dangerous in case of electricity power off.
  • Insulating layer is installed at the bottom of main girders to prevent molten steel thermal radiation to ensure the long serving life of main girders.
  • Special designed metallurgy motor is used, with insulation class H level, and motor protection grade IP54.
  • Cast steel pulley is used to ensure the safety and long working life.
  • Steel core wire rope is used, which is suitable for high temperature environment with the safety factor≧ 7.1.
  • High temperature resistant cable is used for the power supply of trolley.
  • Thermal insulation layer and air conditioning is equipped to the cabin.

Optional Function

  • All the mechanism speed regulation is 1:10 or bigger
  • Overload limiter and alarm display, and the load of weighing and display
  • Height limiter device
  • The change between main hook and aux hook on single trolley
  • Central lubrication
  • PLC controlling and accident testing, record display and typing system

Ladle Overhead Crane Specifications

Below is 10 ton standard overhead crane parameters for reference, tailor-made crane solution is available. If the product is upgraded and optimized, the parameters may be different.

Lifting capacity ton 10
Span S（m） 10.5 13.5 16.5 19.5 22.5 25.5 28.5 31.5
Lifting height m 20 20 20 20 20 20 20 20
Lifting speed m/min 13 13 13 13 13 13 13 13
Trolley speed m/min 44.9 44.9 44.9 44.9 44.9 44.9 44.9 44.9
Crane speed m/min 118.6 118.6 118.6 119.3 119.3 114.9 114.9 114.9
Lifting motor kw 26 26 26 26 26 26 26 26
Trolley motor kw 2.2 2.2 2.2 2.2 2.2 2.2 2.2 2.2
Total weight kg 17480 19680 22200 25800 28570 33750 37910 41780
Max Wheel Load KN 112 120 130 138 145 160 171 180
Track 　 P43 P43 P43 P43 P43 P43 P43 P43
Main dimension mm 10.5 13.5 16.5 19.5 22.5 25.5 28.5 31.5
Rail top to main top H1 1876 1876 1876 1876 1876 1926 1926 1926
Rail top to hook centre H2 602 602 602 602 602 552 552 552
Wheel base W 4050 4050 4050 4050 4050 5000 5000 5000
Crane width B 5800 5800 5800 5940 5940 6380 6380 6380
Hook left limitation S1 1600 1600 1600 1600 1600 1600 1600 1600
Hook right limitation S2 1300 1300 1300 1300 1300 1300 1300 1300
Trolley gauge K 2000 2000 2000 2000 2000 2000 2000 2000

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How to get quotation?

Overhead & Gantry Crane

  • Lifting capacity:
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Jib Crane Inquiry

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Hoist Inquiry

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Send us your RFQ including the parameters above, we will reply our quotation accordingly.