QTZ250 (TC7021) Tower Crane

Brand: Zhengxing
Model: QTZ250 (TC7021)

Product Introduction

1. Technical Features

The QTZ250 (TC7021) is a heavy-duty tower crane designed for large-scale construction projects, offering high lifting capacity, excellent stability, and reliable performance. Its high-strength steel structure, advanced control technology, and comprehensive safety systems make it suitable for demanding construction environments.

• The tower crane features a 2.0 m × 2.0 m tower cross-section, providing excellent structural strength, stable operation, and low sway.

• The tower body is manufactured from high-strength Q345 steel, ensuring long service life and reliable performance.

• Maximum working radius: 70 m

• Maximum lifting capacity: 12 tons

• Maximum tip load capacity: 2.1 tons

• Rated lifting moment: 2500 kN·m

• Free-standing height: 50 m

• Maximum attached height: Up to 200 m with wall tie attachments.

2. Standard Tower Section

• Standard section dimensions: 2.0 × 2.0 × 3.0 m

• Main material: L200 × 200 × 20 mm Q345 high-strength angle steel

• Pin-shaft connected sections provide convenient transportation, quick installation, and secure assembly.

• Multiple foundation installation options are available:

  • Outrigger fixing

  • Base frame counterweight fixing

  • Embedded anchor bolt fixing

3. Performance & Safety Features

• Modern appearance with optimized structural design and high operational efficiency.

• Advanced speed control technology enables smooth luffing and slewing operations, improving precision and reliability.

• The independently mounted space capsule operator cabin provides a wide field of view and a comfortable working environment.

• Complete mechanical and electromechanical safety devices ensure safe and dependable operation under harsh construction conditions.

Electrical Control System

Standard Version

• The hoisting mechanism is driven by a multi-speed pole-changing motor, reducing inertia impact and ensuring reliable lifting performance.

• Equipped with original Schneider Electric components for dependable electrical operation.

Energy-Saving Version

• The hoisting mechanism adopts variable frequency drive (VFD) control with a high-quality electrical control system.

• Provides smoother operation, reduced energy consumption, and improved efficiency.

Slewing & Luffing System

• The slewing mechanism uses a dual-wound rotor motor with series resistance speed regulation, ensuring smooth and accurate rotation.

• The luffing mechanism adopts a dual-speed motor, providing stable movement and efficient operation.

Main Specifications