The downward bending of the main beam of an electric single-girder crane refers to the situation where the main beam that was originally supplied at the top bends downward. Single-girder cranes are equipped with two operation modes: ground operation and air operation. There are two types of ground operation: wired handle operation and remote control handle operation. Aerial operation refers to cab operation.

The driver's cab is available in two types: open and closed. According to the actual situation, it can be installed on the left or right side. The entry direction is available in two types: side and end, to meet users' various needs for selection. Single-girder cranes usually refer to single-girder bridge cranes.

The main beams of single-girder crane bridge frames mostly adopt I-beams or a combination section of steel profiles and steel plates. Lifting trolleys are often hand chain hoists, electric hoists or assembled with hoists as components of the lifting mechanism. This is due to the fatigue of the main beam caused by long-term overloading. In such cases, the use should be stopped immediately. Then report to the crane manufacturer and have it handled by professional technicians. Crane manufacturers usually adopt flame repair and stress tie rod repair. However, this requires the main beam of the crane to be removed and transported back to the manufacturer to complete the repair.

Here, we also remind the operators of electric single-girder cranes that they must never overload or operate beyond their capacity. The safety issues caused by this are very serious. Single-girder cranes are equipped with two operation modes: ground operation and air operation. There are two types of ground operation: wired handle operation and remote control handle operation. Aerial operation refers to cab operation. The driver's cab is available in two types: open and closed. According to the actual situation, it can be installed on the left or right side. The entry direction is available in two types: side and end, to meet users' various needs for selection. Therefore, it is recommended that customers install an overload controller when installing single-girder cranes, so that the crane will issue an overload signal when overloaded.

The repair of steel structures (engineering structures) can be carried out by using the flame correction method to repair the main beams based on the equipment conditions, and steel plates can be used to reinforce the main beams. (To reduce the welding deformation of the main beams during construction, after spot welding and positioning of the steel plates, symmetrical intermittent welding on both sides is adopted, with the upper weld seam welded first and then the lower weld seam welded) to increase the rigidity and strength of the main beams and meet the usage requirements.