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Navy Gun Story

Navy Gun Story

Linear actuation for advanced gun system for the US Navy from Exlar.

Exlar Corporation has announced its award to provide linear actuators for the US Navy’s Advanced Gun System Program


BAE Systems, along with partner General Dynamics Armament and Technical Products, delivered to the US Navy the first automated magazine for the 155-mm Advanced Gun System (AGS) being developed for the DDG 1000 (Zumwalt) Destroyer Program. The magazine is the first major production component to be delivered under the AGS program. It is one of a total of four magazines that will be built under a Navy contract to produce four AGS weapon systems for the Navy's first two Zumwalt class destroyers.

More than 40 Exlar GSX20 and GSX30 linear actuators are used for each gun and magazine as part of the Advanced Gun System. Exlar’s inverted roller screw actuators with integrated brushless servo motors provide linear actuation as part of the world’s largest fully automated ammunition supply magazine. Exlar’s GSX series actuator combines a brushless servo motor, an inverted roller screw and an encoder/resolver feedback source into a single compact assembly, which eliminates the cost and complexity of a systems engineering approach, as all elements for producing linear motion have been properly matched and designed into the actuator

Closed Loop Servo Systems

The brushless servo design of the GSX series linear actuators allows them to be used in state-of-the art closed loop servo systems where electronic control of positioning and velocity is required. In these systems, position feedback can be provided in a number of different forms to match customer specifications, including resolvers, encoders or internally mounted linear position feedback sensors.

The GSX series actuators employ an inverted roller screw mechanism to convert the rotary motion of the brushless motor into high speed, high thrust linear motion. This mechanism has a lead accuracy of 25mm/300mm for high precision operation and can also be supplied with zero backlash. GSX actuators are suitable for use in many other demanding applications, including: automatic tool changers, dispensing, wire guiding, chip and wafer handling, robot manipulation, testing, web guidance, indexing material cutting, tension control, volumetric pumps, simulation testing, automated assembly, injection molding and riveting, joining and fastening.

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Energy saving rebuild for tyre shredder

ERIKS’ ability to provide repair services in addition to OEM component specification and supply made it the ideal point of contact for a full service solution for a tyre shredding machine rebuild

ERIKS UK has recently applied its engineering know-how to the re-manufacture of a tyre shredder used at one of the UK’s largest tyre recycling centres. ERIKS specified and sourced a complete range of power transmission products for the in-house build, ensuring a more efficient and productive finished machine.

The tyre-recycling centre in question is capable of recycling up to five million individual tyres each year and reducing them to a fine quality crumb which can be used for a range of products including sports surfaces and children’s playgrounds. The operator had a requirement for a damaged tyre shredder to be fully overhauled. A large number of components needed to be repaired or replaced including the motors, gearboxes, couplings, bearings and drive chains; due to the high energy usage of the machine the client also saw this as an opportunity to up-date the shredder and make it more energy efficient.

Reduced Lead Times

Following approval from the client, ERIKS engineers completed a detailed strip-down and inspection of the entire machine. Mahesh Patel, Technical Manager at ERIKS, says: “Once we had seen the damage that had been caused we could identify which parts could be repaired and which needed to be replaced. We then worked with the customer throughout the project, specifying and supplying the best components for the job to rebuild and update the shredder; not having to outsource jobs to other companies allows us to drastically reduce lead times and manage costs.”

astically reduce lead times and manage costs.” Large 75kW WEG high efficiency motors were chosen to drive the main shears that reduce the tyres to a fine crumb, smaller WEG motors were also chosen to drive the primary handling rotors that feed the tyres into the shears. One of the benefits of WEG’s W22 range is its energy efficient performance, which reduces losses by 10-40% compared with typical motors. Fenaflex Tyre Couplings were used to connect the motors to the inline gearbox. The couplings are highly efficient and have excellent shock absorbing properties, isolating the motors from vibration and torsional oscillations. The Tyre couplings have zero backlash, which is ideal for reversing applications, especially when using geared drives. Wear can be detected through visual inspection.

The two in-line reduction gearboxes in the main drive system were stripped and assessed, due to the significant wear present on the gear teeth, all gear internals were replaced with new case carburised gears manufactured in-house. Seals and bearings were replaced or upgraded as necessary using leading brand components with high wear factors and lower friction coefficients for maximum efficiency. Right-angle Fenner gearboxes were used to drive the handling rotors and the opposing ends were mounted on SKF housed bearings, reducing the maintenance requirements and maximising robustness in the design.

In addition to the motors, couplings and gearboxes, ERIKS also supplied components such as seals, gearbox bearings, drive chain and sprockets.

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