Technical requirements for LDY5-13.5 A6 metallurgical single-girder crane

I. Overview

This crane is primarily used in metallurgical and foundry applications to lift molten metal or other high-temperature heavy objects. It achieves vertical lifting and horizontal displacement of heavy objects through intermittent and cyclic operation, making it a key piece of equipment for improving efficiency in modern metallurgical production.

Scope of Application

• Working Class: Complete Machine A5, Hoisting Mechanism M6, Operating Mechanism M5.
• Ambient Temperature: -10°C to +40°C. Power Supply: 380V/50Hz, three-phase, four-wire.
• High-Temperature Environment Adaptability: The motor utilizes H-class insulation, and the wire rope is specially designed for high-temperature resistance.

II. Technical Parameters

Basic Parameters

• Rated lifting capacity: 5 tons.
• Span: 13.5 meters.
• Lifting height: 6/9 meters (optional).
• Lifting speed: 8 m/min, trolley operating speed: 20 m/min, crane operating speed: 20 m/min.

Structural Parameters

• Main beam cross-sectional moment of inertia: Jx = 114649 cm⁴, Jy = 22809 cm⁴, flexural modulus Wx (lower) = 3252 cm³.
• Wheel diameter: Meets JB/T6392.2-1992 standard. Tread free of cracks and wheel rim free of casting defects.

III. Key Component Requirements

Hoisting Mechanism

• Motor: ZD41-4-7.5 kW (Class H insulation, Nanjing Electric Motor Factory).
• Braking System: Dual-brake design, with the safety brake automatically activated if the primary brake fails.
• Limit Protection: Dual rise limiters to prevent wire rope overwinding.

Operating Mechanism

• Trolley Motor: YDE series (specific power unspecified), trolley motors: ZD21-4-0.8 kW x 2.
• Reducer: Smooth transmission, noise ≤ 85 dB, leak-proof seals.

Electrical System

• Operation: Remote or ground control, in compliance with GB6067-2010 safety regulations.
• Conductor Bar: 15 mm² high-strength safety conductor bar for metallurgy applications.

IV. Safety and Quality Control

Materials and Manufacturing

• The drum material and welding quality must comply with national standards. The wire rope must be specially designed for high-temperature resistance.
• The maximum wheel load is ≤3.55 kN, and the track is 24 kg/m.

Protective Design

• The entire machine is protected against high-temperature radiation. The electric hoist has an operating level of ≥M6.
• It is equipped with a rope-break prevention device and an overload limiter.

V. Scope of supply (example)

Serial number	Name	Specifications/Parameters	Quantity	Remark
1	Safety conductor rail	15mm² metallurgy special	2m	High temperature resistant design
2	Wire rope	High temperature resistant type	1 set	Supporting lifting mechanism
3	Main lifting motor	ZD41-4-7.5KW (H-class insulation)	1 unit	Nanjing Electric Motor Factory

VI. Reference Standards

• Design Specifications: JB/T1306-2008, GB/T14405-2011.
• Safety Standards: GB6067-2010, Special Document No. [375] of the Quality Inspection Office.