Counterweight sheave: One of the core components of an elevator system
2025-06-30 19:29
The reversing sheave (also known as a guide sheave or counterweight reversing sheave) is a key component of the elevator system. Primarily installed on the counterweight or car side, it changes the winding direction of the steel wire rope and adjusts the traction force. Its main functions include:
1. Changing the winding direction of the steel wire rope
In a double-wrap (2:1) elevator, the reversing sheave changes the direction of the steel wire rope after it unwinds from the traction sheave, creating a reasonable rope layout and ensuring effective transmission of the traction force.
In a single-wrap (1:1) system, the reversing sheave mainly adjusts the path of the steel wire rope, making its connection to the car and counterweight more reasonable.
2. Adjusting the traction force
By increasing the wrap angle of the steel wire rope on the traction sheave (such as in a double-wrap design), it improves the traction force and prevents the steel wire rope from slipping.
It ensures stable frictional force during elevator operation, preventing slippage or loss of control due to insufficient traction force.
3. Balancing the forces on the car and counterweight
In a 2:1 wrap elevator, the reversing sheave distributes the tensile force of the steel wire rope more evenly, reducing the load on each wire rope and extending its service life.
It helps to share the weight of the car and counterweight, making the elevator run more smoothly.
4. Reducing wear on the steel wire rope
Through reasonable guiding design, it reduces the uneven wear, twisting, and vibration of the steel wire rope during operation.
Using wear-resistant materials (such as polyurethane coating) or special groove types (such as U-shaped grooves, V-shaped grooves) reduces frictional wear.
5. Improving the smoothness of elevator operation
It reduces noise and impact caused by the bouncing or vibration of the steel wire rope. It works with tensioning devices (such as compensation chains/cables) to maintain stable steel wire rope tension.
6. Adapting to different elevator layouts
In machine-room-less elevators or small machine-room elevators, the arrangement of the reversing sheave can optimize space utilization.
In high-speed elevators, high-precision bearings and shock-absorbing designs are used to ensure stability during high-speed operation.
As an important moving pulley in the elevator system, the reversing sheave mainly undertakes the functions of changing the direction of the steel wire rope, enhancing traction force, balancing forces, reducing wear, and improving operational smoothness. Its performance directly affects the safety and reliability of the elevator, so its wear, lubrication, and bearing condition should be paid close attention to during daily maintenance.
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Counterweight sheave: One of the core components of an elevator system
A counterweight sheave (also known as a guide sheave or counterweight reversing sheave) is a key pulley component in an elevator system. It is mainly installed on the counterweight side or the car side to change the winding direction of the steel wire rope and adjust the traction force.
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