Traction wheel introduction

The traction sheave is a key component of the elevator's traction machine, often referred to as the traction drum or rope drum. It plays a crucial role in transferring the power from the motor to the elevator car and counterweight through the friction between the steel wire ropes and the grooves on the sheave. This component is typically mounted on the worm gear shaft within the reducer. In gearless traction machines, it is positioned on the same axis as the motor and brake shafts, ensuring smooth and efficient operation.

1. Material and Process Requirements for the Traction Sheave

The traction sheave must withstand both static and dynamic loads from the elevator car, counterweight, and other connected components. Therefore, it requires high strength, excellent toughness, wear resistance, and impact resistance. For this reason, materials like QT60-2 spheroidal graphite cast iron are commonly used. To minimize the wear of the steel wire ropes inside the grooves, not only should the groove shape be carefully selected, but the surface roughness and hardness of the working area must also be properly controlled to ensure long-term performance and safety.

2. Diameter of the Traction Sheave

The diameter of the traction sheave should be at least 40 times the diameter of the steel wire rope. In practice, it is usually designed to be 45 to 55 times the rope diameter, and sometimes even more than 60 times. This larger size helps reduce the overall volume of the traction machine by increasing the gear reduction ratio, which is essential for compact design without compromising performance.

3. Structure of the Traction Sheave

The traction sheave is typically constructed in two parts: a central drum and an outer rim with grooves cut into it. These two components are joined together using bolts, forming a single unit that rotates around the worm gear shaft inside the reducer. This modular design allows for easier maintenance and replacement when needed.

2. Rope Groove Shape of the Traction Sheave

The traction force that moves the elevator is generated by the friction between the steel wire ropes and the grooves on the traction sheave. The shape of the grooves significantly affects the efficiency and reliability of this process. Proper groove design ensures maximum contact area and reduces slippage, which is especially important in older elevator systems where maintenance and performance optimization are critical.

Hook Twin Tie Plate

Technical Parameter of Hook twin tie plate

Material standard: TS-503, we normally use material as Q235

Main size:

H series: H23, H27,H31,H35

L series: L23,L27,L31,L23J,L27J,L31J

LR series:LR23,LR27,LR31

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