2. 1905 A crane with a fixed tower and a boom appeared; 1923, the prototype of modern tower crane was made, and the first relatively complete modern tower crane appeared in the same year.
3. The tower crane in China started in Shanghai on 1950.
Extended data:
It can be divided into: 1 according to the luffing mode. Pitch pitch type; 2. The car is pitching.
According to the operation mode, it can be divided into: 1. Jack-up; 2. I didn't mention it myself.
According to the rotation mode, it can be divided into: 1. Movable arm type; 2. Lower rotary type.
In a fixed way, it can be divided into: 1. Track type; 2. Jellyfish posture.
According to the spire structure, it can be divided into: 1. Flat head type; 2. Pointed type.
According to the operation mode, it can be divided into: 1. Mechanical automation; 2. artificial control.
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