The traction sheave is a critical component of the elevator's traction machine, often referred to as a traction pulley or drum. It plays a key role in transferring the driving force from the motor to the elevator car and counterweight through the friction between the steel ropes and the grooves on the sheave. The sheave is typically mounted on the worm gear shaft within the reducer. In gearless traction machines, it is positioned next to the brake assembly and shares the same axis as the motor and brake shafts.
1. Material and Manufacturing Requirements
The traction sheave must endure both static and dynamic loads from the elevator car, counterweight, and other components. Therefore, it needs to be made from materials that offer high strength, good toughness, wear resistance, and impact resistance. A common material used is QT60-2 spheroidal graphite cast iron. To minimize rope wear, the surface finish and hardness of the groove must be carefully controlled. The shape of the groove also plays an important role in ensuring proper contact and reducing slippage between the rope and the sheave.
2. Diameter of the Traction Sheave
The diameter of the traction sheave should be at least 40 times the diameter of the wire rope. In practice, this ratio usually ranges from 45 to 55 times, and sometimes even exceeds 60 times. This larger size helps reduce the reduction ratio of the gearbox, which can lead to a more compact and efficient traction machine design. However, the diameter must be balanced with the overall system requirements to ensure smooth operation and longevity.
3. Structural Design 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 sections are connected using bolts or hinges, forming a single unit. The axis of the sheave aligns with the worm gear shaft inside the reducer, ensuring precise mechanical alignment and efficient power transmission.
2. Rope Groove Shape of the Traction Sheave
The friction between the steel rope and the groove on the traction sheave is what generates the pulling force needed to move the elevator. The shape of the groove significantly affects the efficiency and safety of the system. Common groove types include V-shaped, U-shaped, and semi-circular designs, each offering different levels of grip and wear characteristics. Proper selection and maintenance of the groove shape are essential for reliable elevator performance and long-term durability.
Galv Surge Arrester T Bracket MTG
Product Name:Galv Surge Arrester T Bracket MTG
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Application: Easily manipilate the state of our functional component without needing to convert them into class components.
Technical parameters
Description: Galv surge arrester T bracket MTG
Size:164x130x5
Part No.: Q.Q.Q.000010
Material elongation:Q345,Q235
Finished: Galvanized,HDG,Plain,Painting,Dacromet,Electrogalvanizing,Oiled,Phosphorization,etc
Place of origina:China
HS Code:730820
Trademark:ZBRF
Color:Customized
Part:Power,Galv
Transport Package:Plastic Bag or Gunny bag and Wooden Case
Port of shipment:Shanghai Port,Taicang Port
Certification:CE,SGS,A.S
Tensile strength ≥410Mpa
Yield strength ≥280Mpa
Elongation≥22%
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TAICANG ZHONGBO RAILWAY FASTENING CO., LTD. , https://www.railfastener.com