Henan crane manufacturer analyzes the working prin
Release time：2021/9/25 16:13:25 Source： Author：Henan Huajun Crane
Henan crane manufacturer analyzes the working principle of crane braking device
Braking devices are divided into two types: brakes and stoppers. The stopper can only allow the shaft to rotate freely in one direction and cannot absorb kinetic energy. It can only support objects to remain stationary. Generally, the working mechanism of a crane should be equipped with a brake. Only in the following situations can a brake be omitted: 1. The mechanism is driven by a hydraulic cylinder that moves in a straight line, and the locking oil circuit can stop the mechanism against the ground. 2. The manual operating mechanism of the bridge crane is not affected by wind or slope forces.
When the excitation coil of the crane brake is connected to the rated voltage (DC), electromagnetic force attracts the armature, causing it to detach (release) from the brake disc. At this time, the transmission shaft runs or starts normally with the brake disc. When the transmission system separates or loses power, the brake also loses power at the same time. At this time, the spring applies pressure to the armature, forcing friction torque between the brake disc and the armature and flange, causing the transmission shaft to quickly stop rotating. When the cooling environment of the brake is poor and the transmission shaft works continuously for a long time, if conditions permit, the voltage can be maintained and converted to 70% -80% of the rated voltage after the brake works to reduce heat generation.
According to different installation and operation conditions, brakes are divided into three types: normally closed, normally open, and comprehensive. Bridge cranes (double beam cranes - double main beam gantry cranes) mostly use normally closed brakes on the U-shape. The normally closed brake is closed when the mechanism is not in operation. If you want the mechanism to work, simply release the brake to separate the friction pair of the brake, and the mechanism can operate. The brakes used on cranes can be classified according to their shapes, including block brakes, belt brakes, disc brakes, and cone brakes.
Henan crane manufacturer
The braking device is an important component to ensure the safe and normal operation of the crane. In lifting operations, the braking device is used to prevent suspended objects or lifting arms from falling, and to prevent the turntable or crane from sliding under the force of wind or slope components; Or reduce the speed of the operating mechanism and finally stop moving; It can also be operated by gripping heavy objects according to work needs; In special circumstances, adjust the speed of motion by balancing power and gravity.