The following is a detailed introduction to the QTZ250 (7020-10) tower crane, covering its main parameters, performance characteristics and typical applications:

Basic parameters

1. Model analysis
QTZ250: indicates the group code of the tower crane (Q-crane, T-tower, Z-self-elevating), 250 is the maximum lifting torque (2500 kN·m).
7020-10:
70: maximum arm length 70 meters;
20: maximum lifting weight at the arm end 2 tons;
10: maximum lifting weight 10 tons (usually at the arm root, when the arm is in short working condition).

2. Lifting performance
Maximum lifting capacity: 10 tons (near the arm root);
Minimum lifting capacity: 2 tons (70-meter arm end);
Lifting torque: 2500 kN·m;
Luffing speed: 20-60 m/min (frequency conversion control).

3. Working range
Effective arm length: 70 meters (can be shortened to 35 meters, 50 meters, etc. according to needs);
Coverage: suitable for large-scale construction sites.

4. Lifting height
Independent: about 60 meters;
Attached: can reach more than 200 meters (increase height through standard sections and attachment devices).

5. Motor power
Lifting motor: 55 kW (frequency conversion speed regulation);
Slewing motor: 2×5.5 kW;
Luffing motor: 7.5 kW.

Structural features

1. Standard section of tower
2×2×3m section, high-strength pin connection, strong stability.

2. Lifting arm
Triangular truss structure, lightweight design, good wind resistance.

3. Slewing mechanism
Planetary gear reducer + frequency conversion control, smooth rotation (0-0.6 r/min).

4. Safety device

Standard torque limiter, weight limiter, amplitude limiter, slewing limiter, etc., in line with GB/T 5031 standard.

Application scenarios

Large-scale construction projects: high-rise residential buildings, commercial complexes, bridge construction.
Industrial projects: hoisting of heavy components such as power plants and petrochemical plants.
Advantages: large coverage, high efficiency of medium and long arm hoisting, suitable for group tower operations.

Technical highlights

1. Frequency conversion control: lifting, rotation, and amplitude change all adopt frequency conversion speed regulation, stable operation, and small impact.
2. Modular design: convenient transportation of components and quick installation.
3. Intelligent monitoring: optional remote monitoring system to monitor load, wind speed and other data in real time. ---

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