Rotor locks

Rotor locks admissible side load: 500 .. 7000 kN
piston restoring force: 50 .. 589 kN
stroke: 50 .. 115 mm
operating pressure: 250 bar
temperature range: -30 .. +70°C
option: position monitoring

Description

Rotor locks for on- and off-shore wind power plants

Maintenance of wind power plants especially in off-shore installations make the highest demands on man and material. Harsh weather conditions at sea make the work difficult.
To provide the maximum possible protection for employees and the required safety at work , ROEMHELD has developed, for the operators and manufacturers of wind power plants, a hydraulic and electromechanical rotor lock, that safely, reliably and quickly locks the rotor blade during maintenance works.

Rotor locks for on- and off-shore wind power plants

ROEMHELD Rotor lock

The ROEMHELD rotor lock works with hydraulic or electro-mechanical locking mechanism and withstands side loads up to 4,900 kN. The double-acting hydraulic cylinder generates the retracting and extending motion of the bolt and reliably locks the rotor blade of wind power plants up to 6.5 MW within a temperature range from 30°C to +70 °C. A mechanical or inductive position monitoring of the bolt transmits the final positions "Rotor blade secured" and "Rotor free" to the system control and ensures additional safety.

Rotor lock

Hydraulic design with housing

The double-acting hydraulic cylinder generates the extending and retracting movement of the bolt and holding in the safety position. The hydraulic cylinder is guided and installed in a stable housing and provided with a surface protection for use in on- and offshore applications. A position monitoring of the locking and release position is integrated into the housing.

Hydraulic design with housing

Hydraulic design without housing

The double-acting hydraulic cylinder generates the extending and retracting movement of the bolt and holding in the safety position. Suitable for installation in existing holder bores.

Hydraulic design without housing

Hydraulic design with position monitoring

The double-acting hydraulic cylinder generates the extending and retracting movement of the bolt and holding in the safety position. The position monitoring is installed in the flange-mounted housing. The hydraulic cylinder is guided and installed in a stable housing and provided with a surface protection for use in on- and offshore applications.
To achieve a high degree of safety, on the side of the housing an additional mechanical lock can be mounted.

Hydraulic design with position monitoring

Electro-mechanical design

The approaching movement of the bolt is effected by an electric motor. The clamping and unclamping positions are inductively monitored. Due to the type of construction and the drive, the locked position is self-locking. The locking element is suitable for onshore and offshore applications.

Electro-mechanical design

Function

The ROEMHELD rotor lock can be directly integrated into the structure of the wind wheel or mounted to the structure in a separate housing.

 

Rotor lock integrated in the structure of a wind wheel

Locking bolt retracted: The locking bolt is retracted with hydraulic pressure and hold in the retracted position. The rear limit switch signals the retracted position. The wind wheel is free.

Locking bolt extended: The locking bolt is extended with hydraulic pressure and moves into a bore hole in the brake disk of the wind wheel. The front limit switch signals the extended position. The wind wheel is locked.

Locking bolt retracted
Locking bolt extended

Rotor lock mounted to the structure of the wind wheel

The rotor lock is installed in a separate housing to be mounted to the structure of the wind wheel. 
The function is identical to the function of the integrated rotor lock.

Rotor lock with housing- locking bolt retracted
Rotor lock with housing - locking bolt extended
Rotor lock with housing - top view

Corrosion protection

Our rotor locks promise a durability and a corrosions resistance for 20 years. For this purpose, some special features and developments have been installed in the "lock":

  • as an option equipped with high-performance slide bushings to reduce critical pressure load
  • bolts are maintenance-free, regular lubrication is not required
  • all moving parts with a special coating of a complex Tenifer treatment
    thus high corrosion and wear resistance
  • not moving parts get a particularly complex chromium oxide coating with effective protection against wear and corrosion
  • on request with a stainless and contactless position monitoring

Downloads