When the crane is lifting, due to excessive inertia force caused by lifting heavy objects, misoperation, bearing surface subsidence or excessive wind force, the crane often suddenly loses stability, or even overturns, resulting in accidents. 　　

The rubber tyred crane and truck crane are determined by the structural conditions. When the outrigger is used or not, the most dangerous instability condition is that the boom is at the position perpendicular to the side tipping line of the cart and horse. Therefore, when considering the stability of the crane and the stability test of the inbound and outbound travel, it is based on the working condition of the jib at the right side. Under this working condition, the crane must have the lowest stability. 　　

The lifting capacity of wheeled and truck cranes is not only determined by the stability of the whole machine, but also controlled by the strength of the boom. The selection of boom section is also calculated according to a certain working condition (a certain boom length and amplitude and its corresponding lifting weight). Then, determine the lifting capacity under different boom lengths and ranges according to the possibility of existing strength of the boom. From this, the lifting capacity amplitude curve is drawn, which is called strength lifting characteristics. Different arm lengths can lead to a group of different curves.

Different types of cranes have different strength lifting curves, which are marked on the signs in the cab. The driver must operate according to the curve requirements. Some cranes have alarm devices to prevent overload. It can be seen from the above that in order to ensure the lifting stability of the crane, the driver must strictly abide by the safety operation rules, and it is strictly prohibited to use the crane with overload, and it is strictly prohibited to rotate the load at high speed, so as to avoid causing excessive centrifugal force and causing the crane to tip over.

Huai'an Crane Rental Company Here we remind you that if the crane is too fast and heavy when lifting heavy objects, it is easy to tilt or even roll over, so pay attention to the stability of the crane during operation.