Due to the characteristics of crane cycle and intermittent work, so that each working mechanism is often in the state of frequent start and brake, brake has become an indispensable part of the power-driven crane mechanism, it is not only the control device for mechanism work, but also the safety device to ensure crane operation.
Whether the brake is intact and reliable is the key point of safety inspection.
Crane brake is installed on the motor shaft, used to brake the operation of the motor, so that its operation or lifting mechanism can be accurate and reliable stop in the predetermined position.
1. Crane brake type classification:
Crane brake commonly used with a spring type of short-stroke electromagnet double shoe brake, referred to as a short stroke brake (single-phase brake);
Spring type long stroke electromagnet double shoe brake, referred to as long stroke brake (three phase brake);
Hydraulic push - rod type double - shoe brake, referred to as the push - rod brake three.
The brake plays an indispensable role in the crane escort, it can be said that if the crane is not installed in the brake device, then just like the car does not have the brake function, in the role of inertia parking is a serious hidden danger.
2. Working principle of crane brake:
Although crane brakes vary according to different types of operating requirements, they play the same role in mechanical equipment, mainly through the control of motor rotation and inertia movement, so as to control the equipment to stop, accelerate or decelerate and keep in a certain state of motion.
Due to crane operation function, in the process of lifting heavy weights of the brake is absolutely not allowed to happen, if caused by inertia brake control under the condition of smashing equipment or a threat to the people around health and safety, etc., so the brake for secure and stable operation of the crane equipment plays a very important role.
3. Functions of the brake:
(1) supporting function: to keep the original stationary object in a static state.
For example, in a lifting mechanism, the lifting weight is kept still in the air;
In the luffing mechanism of the boom crane, the boom is kept in a certain position to remain motionless;
It can prevent wind and slide of outdoor crane.
(2) stop action: the kinetic energy of the moving part is consumed, which is converted into frictional heat energy through the friction pair, making the mechanism stop moving rapidly within a certain time or a certain travel.
For example, the braking of various mechanisms in motion.
(3) falling weight: the braking force is balanced with gravity, so that the moving body drops at a steady speed.
For example, the downhill speed of a truck crane.
4. Crane brake maintenance:
The role of crane brake in the equipment is so important, so we need to pay more attention to the maintenance of the brake in the daily life of the process: to regularly check whether the brake is in good working condition, can timely find the existence of hidden dangers to reduce the incidence of crane accidents.
Through the sound to identify whether there are abnormalities in the brake equipment and so on, and the internal crane brake for regular inspection of whether the wear is beyond the allowed scope, whether the spring failure, internal components of impurities and dirt, whether there are more timely cleaning or replacement of internal components.
