Safety technology of operation mechanism of the ho

Safety technology of crane operating mechanism

the driving forms of crane operating mechanism can be divided into two categories: one is the separate driving form (the copolymerization performance and wax content of lower catalyst are better than those of imported catalyst Z501, figure a), and the other is the centralized driving form (Figure B below). Compared with the centralized driving mode, the separate driving mode has light self weight, good versatility, easy installation and maintenance, and its operation performance is not affected by the deformation of the bridge during lifting. Therefore, Ravi Silva, who led this research, said that it is widely used on bridge cranes. Centralized drive is only used for bridge cranes with small lifting capacity and small span

the composition of crane operating mechanism is shown in the figure below, which is composed of motor, gear coupling, transmission shaft, reducer, wheel set, brake, etc. The wheel set driven by the motor through the reducer is called the driving wheel set, and the independent wheel set without motor driving and only playing the role of support is called the driven wheel set. When the motor is powered on, the normally closed brake is opened, and the torque is transmitted to the reducer through the brake wheel coupling, transmission shaft and gear coupling. After gear transmission and deceleration, it is transmitted to the gear coupling of the low-speed shaft and rotates with the wheels in the motor car wheel set. Under the adhesion between the big wheel and the top surface of the track, the driving wheel of the crane rolls along the top surface of the crane track, driving the whole crane

the tear test of electronic universal testing machine is to calculate the tear strength value

(II) safety technology of crane running mechanism

by adding various additives, modifiers and fillers

1 Brake

① the crane operating mechanism must be installed with a brake and adjusted properly, so that it can stop safely within the allowable braking stroke range after the crane is powered off. The allowable braking stroke (also known as the braking distance) s system can be determined according to the following empirical formula:

where V crane - Crane rated running speed, m/min

limit the minimum braking stroke of the crane, that is, the brake cannot be adjusted too tight, and the braking torque must not be too large, so as to prevent excessive braking inertia during parking, which will affect the operating performance of the crane, the large swing of the crane, and the impact on the transmission mechanism

limit the maximum braking stroke of the crane, that is, the brake cannot be adjusted too loose, and the braking torque must not be too small to make the crane sliding distance too long, so as to ensure that the crane can stop safely within the specified distance, prevent collision accidents, and protect the crane bridge and buildings from impact

② the brake should be checked and adjusted every 2-3 days. The operating mechanism driven separately and the brakes at both ends should be adjusted and coordinated to prevent the crane from twisting and gnawing when braking, so that the brakes at both ends can be fully opened without additional friction resistance during operation, so as to ensure the normal operation of the crane