Lifting principle of tower crane

The working range of the tower crane is ensured by the rotation of the boom. The rotary motion is generated by the upper and lower slewing bearings respectively installed on the inner ring and the outer ring of the slewing bearing. The pinion is driven by the slewing mechanism, and the pinion engages with the big gear ring of the slewing bearing to drive the slewing upper bearing to move relative to the lower bearing. The big gear ring needs two to four pinion gears, which are evenly distributed around the big gear ring. ?

The moment of inertia of tower crane is very large, and there is often inertial impact when starting and braking. In order to ensure smooth rotation, the working characteristics of the rotating mechanism should be soft and the rotating speed must be small, which requires the motor driving the pinion to keep synchronous.

Extended data:

Generally speaking, tower crane can be divided into: foundation, tower body, jacking, slewing, lifting, balance arm, lifting arm, lifting trolley, tower top, cab, luffing and other parts according to the functions of each part.

The tower crane needs the foundation part when it is installed on the ground; The tower body is the main body of the tower crane and also the lifting part; The jacking part enables the tower crane to be lifted; Rotation is to keep the upper body of the tower crane rotating horizontally; The lifting mechanism is used for lifting heavy objects; The balance boom keeps the moment balanced; Boom frame is generally the stress part of lifting heavy objects; The trolley is used to install the pulley block, wire rope and hook, and it is also the direct stress part;

Of course, the top of the tower is used to keep the stress balance of the boom; The cab is the place for operation; The luffing is to let the car run along the track and the tower crane rises by itself. Many people don't understand. It's actually quite simple. The tower crane has a jack-up frame, which rises upward at first, and then there will be a gap between the tower and the frame when it is higher than the height of the tower.

At this time, the standard section of the tower is installed in this space, the scaffold is raised here, and the standard section is installed inside the vacated scaffold again.

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.

classify

1 development and design: apply mature design experience or feasible new technology to design a new tower crane, mainly including functional design and mechanism design.

2. Upgradeable design: according to the use experience and technical development, the existing tower crane design is updated and upgraded to improve performance, reduce manufacturing costs or reduce operating expenses.

3 Derivative design: In order to meet the new demand, some modifications or supplements are made to the existing tower crane, so as to develop derivative products different from the standard.

Serialization design: A series of products with the same function and similar appearance but different power, tonnage and size are designed based on a tower crane.

References:

Baidu encyclopedia-tower crane