Énergie

For submarine cable laying maintaining tension in the cable within required tolerances is critical during the laying process to minimise the risk of cable damage due to cable cores being crushed or the minimum bend radius being exceeded. To regulate this tension specialist machines are used to handle the cable as it is laid. One such machine is the 45Te 4-Track Tensioner made by MAATS Tech Ltd, which features electro-mechanical screw jacks for the positioning of the lower tracks. The use of screw jacks on the lower tracks gives this MAATS tensioner the advantage of more accurate positioning for better tension control compared to hydraulic only systems.

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The screw jacks were special units based on Power Jacks E-Series 300kN Metric machine screw jack. They were of the inverted type incorporating wear monitoring for the gear sets. A motorised reduction gearbox with bevel gearboxes to direct the drive line provided drive to each of the four screw jacks. The motor unit included an integral brake for secure load holding while parked. For positioning purposes a rotary cam limit switch was connected to the jacking system, providing emergency over-travel limits and normal system stop limits.

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Bevel gearboxes are in operation on subsea single bolt clamp connectors on subsea retrievable chokes.

For this application a special high torque, subsea variant of the Neeter Drive Range-N Series-39 gearbox was designed. The gearbox features precision spiral bevel gears, reinforced drive shafts and of course special subsea sealing with pressure compensation connections.

At Dounreay Nuclear facility drums containing waste pass through the import / export section of the cementation facility where they need to be removed from their transportation container. A screw jack system using 50kN E-Series machine screw jacks and Range-N bevel gearboxes in an H-Configuration is used to raise and lower the platform.

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Design and manufacture the main linear actuation unit engaging the machine with the reactor standpipe. Four additional screw jacks act as stabilisers when the machine is coupled to the standpipe.

The linear actuator is designed to lift and lower the 20kN load over a stroke of 525mm with the end of travel signalled by proximity sensors installed in the actuator. To maintain a rigid column over the stroke the actuator has two internal guidance mechanisms for the ram. As a safety feature the ram is fitted with a proprietary clutch to act, as a mechanical fail safe, to prevent an overload condition should external control systems fail. Powering the actuator is a 0.75kW motor with integral brake.

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EMA linear actuators are used to move the slave arm relative to the master arm in a tilt and skew motion. The actuators are an integral part of the mechanism and act as load bearing struts, carrying the full reactive loads. The models used are the 5kN and 2.5kN continuous (model C) with 24VDC motor.

4 off A075 Rolaram linear actuators operate a scissor lift mechanism, which raises and lowers containers as part of the encapsulation process.

Power Jacks solar positioning solutions are customer specific and our range of screw jacks and linear actuators can accommodate even the biggest of tracking systems.

Power Jack products have a proven record in arduous environments, delivering quality trouble-free operation for decades. Products Used:

• Screw Jacks
• Electric Linear Actuators

Wind turbine blade manufacture can be automated by the use of screw jacks to open and close the mould used for blade production. Hinges on the mould can be driven by screw jacks to give a full 180 movement for the mould. This type of tilt & pivot movement typically needs the screw jack to pivot as it extends and retracts resulting in the use of motorised screw jacks with double clevis mounting. Their movement can be electronically synchronised by a central control system using motion feedback from encoder and sensors on the screw jacks.

Power Jacks 2 off 200kN (20 tonne) E-Series metric screw jacks with 4 metre screws, cross linked with a drive shaft and couplings.

Each shutter is operated by a Power Jacks 300kN E-Series Metric Machine Screw Jack type E1829 driven by a 7.5kW geared motor.

The screw jack has an inverted translating screw configuration with 500mm of stroke and 16mm lead driven by a 32:1 worm gear set. The standard design was customised to meet the exact customer installation and operation requirements. The special features ranged from large components such as a special lead screw to nuclear grade grease for screw and gear set lubrication.

Has the ability to carry out key operations, including removing and replacing beam limiter plates located in the outer wall of the Torus. The manipulator has an articulated boom that is 9 metres long and can handle loads weighing up to 1 tonne.

The main tilt and side tilt of the boom is controlled using 200kN E-Series metric machine screw jacks. For the main tilt a screw jack at the rear of the arm levers the arm about a point to angle it in a vertical plane. The screw jack for the side tilt mechanism pivots the arm radially around the central axis running along the length of the arm. For the required precision and accuracy anti-backlash screw jacks were specified in order to minimise positioning error at the end of the manipulator, as movement is magnified along the length of the arm.