Important performance of tower crane

Tower crane is the most widely used lifting equipment in the construction industry at present, but the safety accidents caused by it are also frequent. Therefore, as a user of tower crane, it is necessary to have a detailed understanding of it in order to use it better and safer. The main performance parameters of tower crane are introduced in detail below.

1, lifting weight g

① Lifting weight g-the quality of lifting weight. The unit is t.

② Rated lifting weight gn—— the sum of the allowable lifting weight of the crane and the quality of the spreader.

③ Maximum lifting capacity gmax-the maximum rated lifting capacity allowed by the crane under normal working conditions.

2. amplitude l

① amplitude L—— the horizontal distance between the vertical center line and the rotation center line of the no-load spreader when the crane is placed on a horizontal site. The unit is m.

② Maximum amplitude Lmax—— the amplitude when the jib inclination is minimum or the trolley is at the outermost limit position of the jib when the crane is working.

③ Minimum amplitude Lmin—— the amplitude of the car at the maximum inclination angle of the boom or the innermost limit position of the boom.

3. Lifting torque m

The product of the amplitude l and the gravity q of the corresponding lifting object is called the lifting torque, and the unit is kN? m .

The lifting capacity of tower crane is expressed by lifting torque. It takes the product of the maximum working amplitude and the corresponding maximum lifting load as the calibration value of lifting torque.

4. Lifting height h

It refers to the vertical distance from the horizontal parking surface of the crane to the highest allowable position of the spreader. The unit is m.

5. Working speed

① Lifting (descending) speed VN-the vertical displacement speed of rated load under stable motion. The unit is meters per minute.

② Operating speed of crane (cart) Vk-the operating speed of crane in a stable motion state. It is defined as the running speed of the crane under rated load when the wind speed is less than 3m/s at the height of 10m above the ground on the horizontal road surface (or horizontal rail surface).

(3) The running speed of the trolley vt- the running speed of the trolley in a stable motion state. A car with rated load runs on a horizontal track at a height of 10m from the ground, and the wind speed is less than 3m/s.

④ luffing speed Vr—— the average speed of horizontal displacement when the rated load moves stably in the luffing plane. It is defined as the average speed of the crane on the horizontal plane from the maximum to the minimum when the height from the ground 10m and the wind speed is less than 3m/s.

⑤ Rotational speed w-the rotational speed of the rotating part of the crane in a stable motion state. It is defined as the rotating speed of the crane under rated load when the wind speed is less than 3m/s at the height of 10m from the ground on the horizontal ground. The unit is rpm.

6. Gauge or track k

For cantilever cranes other than railway cranes, it is the horizontal distance between the center line of the track or the center line of the walking wheel tread (or crawler) of the crane. The unit is m.

7. Total crane mass Go

It includes the total mass of crane parts, including deadweight, balance weight, fuel, oil, lubricant and water. The unit is t.