Motor drive
The lifting mechanism of Electric Single Girder Overhead Crane mainly relies on the motor to provide power. The motor is connected to the reducer through a coupling. When the motor is powered on, its rotor starts to rotate, thereby driving the input shaft of the reducer to rotate. The speed and torque of the motor are selected according to the design requirements of the lifting mechanism. Generally speaking, a motor with a larger torque is required to lift heavier objects. Common types of motors include asynchronous motors and variable frequency motors. Variable frequency motors can achieve stepless speed regulation by changing the power supply frequency, making the lifting process smoother and more accurate. They are suitable for occasions with high requirements for lifting speed and positioning accuracy.
Speed change of reducer
The reducer plays a vital role in the lifting mechanism. It can convert the high-speed rotation of the motor into a low-speed and high-torque output suitable for the lifting mechanism. The reducer usually consists of multiple gears with different transmission levels. Through the meshing transmission of the gears, the speed is reduced and the torque is increased. In the Electric Single Girder Overhead Crane, the commonly used reducer types include cylindrical gear reducers, worm gear reducers, etc. The cylindrical gear reducer has the advantages of high transmission efficiency and strong load-bearing capacity, while the worm gear reducer has the characteristics of good self-locking performance and compact structure. It can be selected according to specific usage requirements. The output shaft of the reducer is connected to the drum, and the power after deceleration is transmitted to the drum.
Drum and wire rope transmission
The drum is one of the key components in the lifting mechanism. It is fixedly connected to the output shaft of the reducer. When the output shaft of the reducer rotates, the drum also rotates synchronously. The drum is wound with a wire rope. One end of the wire rope is fixed on the drum, and the other end is connected to the hook or sling through a pulley block. As the drum rotates forward and reverse, the wire rope will be wound or released on the drum, thereby realizing the lifting and lowering movement of the hook and the weight. The function of the pulley block is to change the force direction and ratio of the wire rope. By increasing the number of pulleys, the lifting capacity of the lifting mechanism can be increased, but at the same time, the complexity and energy loss of the system will also increase. In the Electric Single Girder Overhead Crane, the pulley ratio is usually reasonably selected according to the requirements of the lifting weight and lifting height.
Braking
In order to ensure the safety and reliability of heavy objects during the lifting process, the lifting mechanism of the Electric Single Girder Overhead Crane is also equipped with a brake. The brake is generally installed between the motor and the reducer or on the drum shaft. When the motor stops rotating, the brake can quickly hold the brake wheel to stop the drum from rotating, thereby preventing the heavy object from falling in the air. The types of brakes mainly include electromagnetic brakes, hydraulic brakes, etc. Electromagnetic brakes have the advantages of fast response speed and smooth braking, while hydraulic brakes have the characteristics of large braking torque and high reliability. The braking torque of the brake needs to be calculated and selected according to the maximum lifting weight and safety factor of the lifting mechanism to ensure effective braking under any circumstances.
The lifting mechanism of the Electric Single Girder Overhead Crane achieves smooth lifting of heavy objects through the coordinated work of multiple links such as motor drive, speed reducer, drum and wire rope transmission, and brake, providing strong support for various industrial production and logistics operations.
