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The lifting mechanism is mainly composed of the following parts: motor, reducer, drum, pulley block, brake, coupling and retrieval device.

The lifting mechanism can be divided into two types, one is an integrated type and the other is a grouped type. A typical representative of the integrated type is the electric hoist. The so-called grouped type means that the mechanism is composed of some independent components, which are combined in a building block style through couplings and transmission shafts. The grouped lifting mechanism has wide adaptability and high reliability, and is also more convenient for fault diagnosis, maintenance and repair of equipment, so it is used in many important places.

The most widely used hook lifting mechanism is the grouped lifting mechanism. The axis of the motor is parallel to the axis of the drum, and a reducer is used to drive between the two axes.

An intermediate shaft is used to connect the high-speed shaft of the reducer and the motor. There is a half-gear coupling on one end of the shaft and a half-gear coupling with a brake wheel on the other end. An intermediate shaft without an external support between the two couplings is called a floating shaft. In addition to allowing slight deviations in radial and angular directions, it can also move slightly along the axial direction. For safety reasons, the brake wheel of the half gear coupling should be installed on the shaft of the reducer. Because, even if the floating shaft is twisted off, the brake can still brake the drum. Sometimes it is necessary to install two brakes. The second brake can be installed on the other end of the high-speed shaft of the reducer, or on another coupling of the floating shaft, or on the tail output shaft of the motor. The advantage of using a floating shaft connection with a half gear coupling is that it improves the ability to compensate for errors in installation, manufacturing, etc., facilitates the assembly and disassembly of parts, and makes the mechanism symmetrical and beautiful. The disadvantage is the increased number of parts. When the drum is short, a gear coupling or an elastic pin coupling can be used between the high-speed shaft of the reducer and the motor. In order to reduce weight and manufacturing costs, plum blossom elastomer couplings are also used in the new product design. It has been proven through use that this coupling has the advantages of simple structure, easy maintenance, large compensation capacity, impact resistance, vibration reduction, wear resistance, low noise, and long service life.

The brake of the lifting mechanism should be normally closed. In the hoisting mechanism of domestic bridge cranes, long-stroke or short-stroke electromagnetic block brakes are generally used. Newly designed cranes, in addition to electro-hydraulic brakes, also use eddy current brakes for speed regulation. Disc brakes are also used abroad.

The lifting mechanism is mainly composed of the following parts: motor, reducer, drum, pulley block, brake, coupling and retrieval device.

The lifting mechanism can be divided into two types, one is an integrated type and the other is a grouped type. A typical representative of the integrated type is the electric hoist. The so-called grouped type means that the mechanism is composed of some independent components, which are combined in a building block style through couplings and transmission shafts. The grouped lifting mechanism has wide adaptability and high reliability, and is also more convenient for fault diagnosis, maintenance and repair of equipment, so it is used in many important places.

The most widely used hook lifting mechanism is the grouped lifting mechanism. The axis of the motor is parallel to the axis of the drum, and a reducer is used to drive between the two axes.

An intermediate shaft is used to connect the high-speed shaft of the reducer and the motor. There is a half-gear coupling on one end of the shaft and a half-gear coupling with a brake wheel on the other end. An intermediate shaft without an external support between the two couplings is called a floating shaft. In addition to allowing slight deviations in radial and angular directions, it can also move slightly along the axial direction. For safety reasons, the brake wheel of the half gear coupling should be installed on the shaft of the reducer. Because, even if the floating shaft is twisted off, the brake can still brake the drum. Sometimes it is necessary to install two brakes. The second brake can be installed on the other end of the high-speed shaft of the reducer, or on another coupling of the floating shaft, or on the tail output shaft of the motor. The advantage of using a floating shaft connection with a half gear coupling is that it improves the ability to compensate for errors in installation, manufacturing, etc., facilitates the assembly and disassembly of parts, and makes the mechanism symmetrical and beautiful. The disadvantage is the increased number of parts. When the drum is short, a gear coupling or an elastic pin coupling can be used between the high-speed shaft of the reducer and the motor. In order to reduce weight and manufacturing costs, plum blossom elastomer couplings are also used in the new product design. It has been proven through use that this coupling has the advantages of simple structure, easy maintenance, large compensation capacity, impact resistance, vibration reduction, wear resistance, low noise, and long service life.

The brake of the lifting mechanism should be normally closed. In the hoisting mechanism of domestic bridge cranes, long-stroke or short-stroke electromagnetic block brakes are generally used. Newly designed cranes, in addition to electro-hydraulic brakes, also use eddy current brakes for speed regulation. Disc brakes are also used abroad.