Screw jacks give direction to nuclear research
A
Power Jacks product story
Edited by the Engineeringtalk editorial team
Feb 19, 2008
Part of the channelling process of the ISIS neutron source is controlled by a reliable linear actuation mechanism based on screw jacks provided by Power Jacks.
ISIS, located in Harwell, Oxfordshire, is the world's most successful pulsed spallation neutron source.
These experiments encompass a wide variety of sciences including physics, materials science, engineering, chemistry, biology and earth science.
In these experiments controlled beams of neutrons and muons are used to probe the microscopic structure and dynamics of matter.
The neutrons are channelled to the desired experimental instruments at the "target station".
Part of the channelling process is controlled by a reliable linear actuation mechanism based on screw jacks provided by Power Jacks.
The target station receives high energy protons from the ISIS accelerator and by the "spallation process" generates neutrons that have their characteristics modified so that they are suitable for neutron scattering experiments.
The protons arrive in a 160kW proton beam, which produces the neutrons when it hits a thick tungsten metal target plate.
The neutrons are then channelled to the various scattering instruments by being directed into beam channels surrounding the target.
There are 18 beam channels in total surrounding the target and each has a shutter mechanism that either allows or prevents neutrons from reaching the experiment.
Each shutter is a 30 tonne steel construction that is required to actuate individually in the vertical plane.
The linear actuation at each shutter is provided by a 300kN E-Series metric machine screw jack designed and manufactured by Power Jacks.
The base model of screw jack used is the E1829.
It is configured with a stroke of 500mm, lead screw pitch of 16mm, 32:1 worm gear set and driven by a 7.5kW geared motor that is coupled to the screw jack via a pin type lubricant free coupling.
The basic screw jack was tailored to suit the exact requirements of the ISIS facility.
Special modifications ranged form small features such as nuclear grade grease to main components such as the special lead screw.
The complete package is self-locking by design to prevent the possibility of back-driving.
This is due to the combination of the screw jacks screw type, screw lead, gear type, gear ratio and the additional reduction gear set in the geared motor.
Over the past 20 years the screw jacks have operated successfully allowing scientists to complete their experiments.
During this time a continuous after sales support service has been provided by the Power Jacks Group, which includes maintaining the availability of spare parts, should they be required.
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