The emergency brake system of the Electric Single Girder Overhead Crane is a key part to ensure the safe operation of the crane, and its working mechanism involves the coordination of multiple components.
When an emergency occurs, such as an operating error, equipment failure, or danger on site, the operator will trigger the emergency brake system. This triggering action can be achieved through the emergency stop button in the operator's room or the emergency stop button on the remote control device. These buttons are designed with high priority, and once pressed, the signal is immediately transmitted to the crane's electrical control system.
After the electrical control system receives the emergency brake signal, it will quickly cut off the power supply to the motor. For the lifting motor, after the power is cut off, the motor stops running, relying on the gravity of the weight itself and the action of the brake to stop the lifting action. The brake of the lifting mechanism is usually a normally closed brake. During normal operation, the brake is kept open by electromagnetic force, and the motor is powered on; when the emergency brake signal is received, the electromagnetic force disappears, and the brake tightly holds the brake wheel under the action of the spring force, thereby stopping the movement of the lifting mechanism.
For the trolley and car running mechanisms, the principle of emergency braking is similar. After the motor is powered off, the inertia of the running mechanism will cause them to continue moving forward for a short distance. In order to stop them as quickly as possible, the running mechanisms of the trolley and the carriage are also equipped with brakes. These brakes convert the kinetic energy of the wheels or the drive shaft into heat energy by means of mechanical friction, so that the trolley and the carriage part of the crane stop moving in a short time.
At the same time, during the emergency braking process, the electrical control system will also record relevant fault information, such as braking time, motor status during braking, etc. This information is very important for subsequent troubleshooting and accident analysis. In addition, in order to ensure the reliability of the emergency braking system, the crane needs to regularly inspect and test the braking system during daily maintenance, including checking the wear of the brake, the elasticity of the brake spring, the stability of the electrical connection, etc. Only by ensuring that all components of the emergency braking system are in good working condition can it play an effective role in an emergency, avoid the occurrence of crane accidents, and ensure the safety of personnel and equipment.
