Bosch Rexroth has introduced an upgrade to the electrohydraulic controller used on the company’s A4VSO and A4VSG hydraulic axial piston components, which function as secondary control units in the Rexroth Active Heave Compensation (AHC) system for offshore winching applications.
Replacing the previous DS1 model, the new Rexroth DS2R electrohydraulic controller features proportional valve technology for more reliability, easier maintenance and lower cost.
控制器直接装配到二次控制单元 - 轴向活塞设备，可以作为泵或电机，以有效地管理旋转AHC系统中绞车驱动器上的扭矩变化。
As part of the overall AHC system, the secondary control unit utilizes either a Rexroth A4VSO (open loop control) or A4VSG (closed loop control) axial piston unit to provide the winch torque control when the AHC system is engaged.
绞车控制是REXROTH AHC系统处理的基本函数。In offshore operations where loads are being lifted or lowered deep underwater, the winch wire carrying the load is routed from the workboat or rig’s towing winch through the AHC system, which actively compensates for the ship’s movements to keep the load steady in the pitch and swell of the open sea.
The DS2R controller comes with the Rexroth 4WRPH high-response proportional valve and offers several key engineering and operational advantages, including:
- 高动态响应，这在不断变化的波动条件下至关重要
- Precise, accurate motion so the loaded winch cable remains continuously “idle” – moving up and down only according to the winch, not the surface wave motion
- 能源效率 - 通过更好地控制液压元件，包括使用液压蓄能器恢复并重新使用高达70％的二级控制单元安装功率的能力
- 更可靠性和更易于维护，具有更简单的设计，消除了三明治滤光片，不太容易污染。
In addition, the proportional valve included with the DS2R is capable of handling a greater range of fluid viscosities and requires less pressure drop to maintain control.
Reliability is also improved with a AWXF axial piston unit swivel angle sensor rated for IP67 standards, making it better suited to harsh open-sea operating conditions.
Besides the DS2R, a DS2E version is available without the fitted Rexroth proportional valve. In addition, a DS2S controller is available with a servo valve instead of a proportional valve for test stand or other applications with very high dynamic requirements.
Bosch Rexroth
Filed Under:Mobile Hydraulic Tips
