Extra wide automatic doors help chassis builder improve energy management

18/10/2018 10:48:16
 
 
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ImagesClick Image for 300dpi jpg fileExtra wide automatic doors help chassis builder improve energy managementExtra wide automatic doors help chassis builder improve energy managementExtra wide automatic doors help chassis builder improve energy management

Two giant high speed roller doors have been installed at a bus chassis works in Lancashire to help retain heat and reduce energy bills. The doors were fitted behind existing roller shutters that remain in place to provide overnight security.

The new doors are each 7m wide and 4.6m high, yet are able to open and close in a matter of seconds. Typically, the doors will be operated many times during a working day, hence the need for speed. They were designed, built and installed by loading bay specialists sara LBS, one of only a few firms with the capability to undertake such a demanding job.

Kevan Anderson, the sara Regional Sales Manager responsible for the project explains that heat retention is an increasingly important issue for many factories and warehouses: “Energy prices have been going up markedly for some years and the trend is expected to continue well into the future. Furthermore, employers are becoming more and more concerned about providing a comfortable working environment because it aids productivity, reduces absenteeism and is an important health and safety issue.”

At the start of the project several design options were considered, including building brick piers to break each door up into two. However, it was soon decided that keeping the original openings was the best plan, as this would provide clear access for the occasional extraordinary load, such as when there was a need to bring in heavy machinery or tooling. This decision went a long way to defining the brief for the new high speed doors.

In fact, all of sara’s doors are bespoke, designed to meet the needs of the application, but based on standard components and subsystems. Its high speed range of Sprint fast action doors combine quick opening speeds with operational safety for both internal and external applications. These are complemented by a full range of other door types including roller shutter doors, sectional overhead doors, fire doors and hinged steel doors, plus lifts, ramps, dock levellers, dock shelters and other equipment that allows sara LBS to offer a full loading bay service.

The high speed doors are made of a high tech fabric that is strong, lightweight and long lasting, sections of which had to be joined together to make the 7m width required for this project. For this sara used a tried and tested method that involves both gluing and stitching to create a perfect seam.

The drive that opens the doors also had to come under the careful scrutiny of the design team. The doors were going to be far heavier than usual and synchronisation across the whole width of the curtain had to be ensured. One option was to use a single large, powerful motor capable of accelerating and decelerating the door through both opening and closing operating cycles. However, this implied an asymmetric design with the drive at one end, which could have lead to a synchronisation lag at the other end.

Therefore, it was decided to develop a twin-drive design with motors at both ends. For this to work, precise synchronisation of the motors’ operation had to be ensured. A mechanical solution could have been used, but a more elegant solution was developed by controlling the instantaneous speed of both motors with the same electronic inverter, into which an electronic synchronisation lock had been programmed.

“The inverter basically ensures soft starting and soft stopping of the door curtain at the beginning and end of its travel,” says Kevan. “It does this by controlling the acceleration and deceleration millisecond by millisecond, which means the lock cannot go out of synchronisation.”

In fact sara also decided to use relatively large motors on the drives so that they were able to cope with the deadweight of the door, its momentum while in motion and any wind load, which could be significant on such a large area.

“We installed the doors in January, so their ability to retain heat was immediately apparent,” says Kevan. “By February people probably wondered how they ever managed without them.”

Photo Captions:-

Pic 1:- The new sara LBS Sprint fast action doors are each 7m wide and 4.6m high, yet are able to open and close in a matter of seconds.

Pic 2:- The doors were designed, built and installed by loading bay specialists sara LBS, one of only a few firms with the capability to undertake such a demanding job.

Pic 3:- sara LBS decided to use relatively large motors on the drives so that they were able to cope with the deadweight of the door, its momentum while in motion and any wind load, which could be significant on such a large area.

About sara LBS

sara Loading Bay Specialists supplies, installs and maintains loading bay systems, high speed doors and industrial doors.It has provided high quality product solutions and outstanding customer service since it was founded 30 years ago and this remains its sole focus.

Product Solutions

sara LBS’s range of high quality products includes its complete loading bay packages (including scissor lifts, ramps and dock levellers), ‘Sprint’ range of rapid roll, high speed doors for internal and external use, insulated sectional overhead doors and roller shutter doors. It has extensive sector expertise and provides total packages that are tailored to meet all its customer’s needs. Specialist sectors include food and beverage, pharmaceutical, automotive, manufacturing, logistics and distribution.

Maintenance & Repair

Sara LBS provides nationwide 24/7 service cover and rapid response times for all loading bay systems, dock shelters, high speed doors and industrial doors using its specialist engineers based across the country. It works with end users to extend the safe working lifetime of their doors and equipment by providing both preventative maintenance packages and standard and emergency repairs.

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The image(s) distributed with this press release may only be used to accompany this copy, and are subject to copyright. Please contact DMA Europa if you wish to license the image for further use.

Editor Contact

DMA Europa Ltd. : David Bedford
Tel: +44 (0)1562 751436 Fax: +44 (0)1562 748315
Web: www.dmaeuropa.com
Email: david@dmaeuropa.com

Company Contact

sara Loading Bay Specialists Ltd : Louise Nurse
Tel: +44 (0)1442 245577 Fax: +44 (0)1442 217117
Web: www.saralbs.co.uk
Email: info@saralbs.co.uk

 
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