Logistical and engineering challenge

For more than 20 years the Asia Cement Group has relied on BEUMER expertise and has numerous installations and bucket elevators by the machine-manufacturing company in operation. Due to the conditions of topography and the resulting logistical and engineering requirements, development, bridging and commissioning of the conveyor had to come from one source. The BEUMER Group is known for extensive know-how in the field of curved belt conveyors and has constantly provided proof of its pioneering role with a large number of patents as well as accomplishing even extremely difficult tasks time and again. Besides its advanced technology, innovative capacity and broad spectrum of expertise, the BEUMER Group is also close to the customer with its subsidiary in Shanghai. In May 2006 the Asia Cement Group placed the order for the 12.5-kilometre long troughed belt conveyor with a mass flow of 1500 tons per hour and a conveying speed of four metres a second with the BEUMER Group.

The terrain to be conquered consists of mountains and bamboo forests. Since a good portion of the bamboo is under nature conservation, no approval was given for a service route, nor was any clear cutting allowed. Even the subsoil posed a serious challenge for BEUMER engineers: for one thing, the ground is unstable because of previous coal mining. At other points the ground consists of granite that can only be removed to a certain extent. In addition, along the route a segment has to be routed through 1.5 kilometres of water. Such extreme outer constraints entail having to mount manually about 90 percent of the installation on site. Since transport by lorry is to some extent impossible the structures have to be carried by mules, piece by piece. For that reason BEUMER designed the entire facility in such a way that all parts can be screwed on and have a carrier length of only three metres. In that way optimum transport can be ensured.

Photo:

The major order with a total volume of 5 million Euros

includes development and installation of a 12.5-kilometre long

installation through rough mountainous terrain (Photo: BEUMER)

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Altitude differences up to 100 metres

After the order was placed, BEUMER in consultation with the Asia Cement Group optimised the routing of the troughed belt conveyor on the spot. With eight horizontal curves having a radius of some 1000 to 5000 metres, the machine manufacturer calculated the precise belt tensile forces in costly simulations. The routing decided on by the engineers was examined for its feasibility on the spot. For this purpose, the entire 12.5 kilometres were gone over on foot through rough terrain in order to check the specified sites for the 460 supports for their suitability directly in the field and down to the millimetre. In doing so, it turned out that a 130 metre granite segment had to be tunnelled. Besides rough terrain, extreme altitude differences of up to 100 metres posed a particular challenge. In order to minimise total costs as much as possible, BEUMER has used four horizontal curves and spans the mountains with bridges up to 55 metres in height.

In close collaboration with the customer, BEUMER developed the entire design and computed the static prerequisites for the bridges and belt facilities. With two model conveyor sections, built on site and mounted and readjusted once again by BEUMER, the design of the bridges could be tested with the conveyor. Additionally, BEUMER carried out load tests with real-life loads and the model conveyor sections could serve as models for building bridges. The Asia Cement Group is responsible for steel construction of the bridge according to specifications by BEUMER engineers and under the constant supervision of two technical supervisors. The BEUMER Group develops, builds and delivers the core parts for the drive and take-up stations as well as all belting and drive technology.

Photo:

In close collaboration with the Asia Cement Group, BEUMER developed the

entire design and computed the static prerequisites for the bridges and belt

facilities (Photo: BEUMER)

Attachments

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BEUMER Group copes with any challenge

For the 12.5-kilometre long conveyor installation the length of the belt is 25 kilometres. The belt has to be vulcanised in 56 places. The width of the belt is 1200 mm and its rigidity is 2800 N/mm.

Besides the eight horizontal curves the installation has 28 vertical curves. In order to keep belt tensile forces under control through six declining segments and six inclining ones the installation is operated with special motors and with BEUMER controls adapted to them. The installed driving power comes to six times 500 kW, frequency regulated with BEUMER controls. Driving power is divided into two drive pulleys at the installation’s feed and head, respectively. In this case, one pulley acts as a double drive for 1000 kW and one as a simple drive for 500 kW. A movable take-up weight was dispensed with and instead the take-up weight is adjusted once and geometrically frozen with a take-up winch.

The troughed belt conveyor should be installed and in operation by mid 2008. Despite all logistical and topographic obstacles the BEUMER Group has coped with every challenge and is right on schedule with construction. And with that, the company has not just delivered a piece of machinery but developed and achieved the customer’s desired results as a whole.

The BEUMER group is a leading international manufacturer of intralogistic systems specializing in conveying, loading, palletizing and packaging technology as well as in sortation and distribution systems. Having approx. 900 employees and a turnover of around EUR 180 million, BEUMER has, with subsidiaries and representations, a worldwide presence for various industries.

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Photo:

The BEUMER Group is known for extensive know-how in the field of

curved belt conveyors (Photo: BEUMER)

Attachments

beumer-4 (JPG)

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Thank you for informations;

Informations are usefull for me, because now I am searching a cement (also clinker ) sources from china to ship Turkey. ■