Tag Archives: screening equipment

Schenck Process filling screen performance data gaps with sensors

Schenck Process says performance data provided by extra sensors fitted to a prototype vibrating screen is substantially improving the understanding of operation of the equipment.

The data is also giving indicators about the overall performance of the processing cycle, according to the company.

Designed and developed in Australia by Schenck Process, the prototype screen is undergoing site trials, but the company already believes the new screen has the potential to change the way vibrating screens are developed and operated.

The standard condition monitoring system comprises two sensor nodes including six degrees of freedom MEMS accelerometers, a high-resolution accelerometer and a temperature probe. On the prototype screen, four additional sensors have been fitted, one on each corner.

Schenck Process Senior R&D Engineer, Doug Teyhan, said: “The measurement regime for the additional sensors includes spring amplitude and mean compression, allowing the estimation of tonnage and load bias (to determine if the feed is presented square to the screen or favouring a side) and the determination of spring operating characteristics and cumulative fatigue damage.

“We are also looking into the development of a predictive failure program to improve overall productivity and efficiency and significantly reduce the possibility of unplanned downtime.”

Historically, failure prediction has been determined by running components to the point of failure and assessing a mean time to this point based on a known operating history.

“The data generated by the prototype screen is utilised to estimate the operating stress of the screen at the most aggressive fatigue areas and assessing the cumulative damage of those areas based on the measurement of non-ideal operating characteristics,” Schenck Process said.

Using a Cumulative Damage System, which counts machine cycles and trend characteristics that have the potential to adversely affect vital component life expectation, the plan is to make the machine monitoring system a lead measure in predicting the potential for component failure, Schenck Process said.

“The expanded monitoring system will also provide input into machine development of the next generation of vibrating screens by filling in the unknowns in the design process with real-time field data,” the company said.

According to Teyhan, the benefits for the customer – including increased availability and improved screen performance – are substantial and have the potential to initiate improvements in the processing cycle.

“And, from a screen operation point of view, the additional data is bringing to light characteristics not previously known. It is highlighting transient feed characteristics – not visible using traditional condition monitoring techniques – that impact the loading of the screen and affect machine life expectation,” he said.

“We also believe there are potential industry-wide benefits, through new design parameters and possible changes to machine construction techniques and materials,” he added.

To optimise the greater range and scope of data the screen is generating, the company is collaboratively investigating and assessing other performance variables, it said. The potential is for control of the variability in the feed rate, more consistent performance and improved overall efficiency of the cycle.

Kwatani bids farewell to founder and chairman, Gunter Vogel

Engineer and self-made industrialist Gunter Vogel, founder and chairman of South African vibrating equipment manufacturer Kwatani, has passed away in Johannesburg after a long illness, the company confirmed. He was 75 years old.

Kwatani said: “Vogel was a well-known personality in the mining and manufacturing sectors, having acquired Joest South Africa, in 1988. It was then a small company importing motors from Germany for the assembly of small vibrating equipment. He built this modest business into a fully independent local original equipment manufacturer (OEM) which was rebranded as Kwatani in 2016. With its focus on ‘engineering for tonnage’, the business has become an industry leader in vibrating equipment solutions through South Africa and beyond.

“Born in Germany in 1944, he studied mechanical engineering before coming to South Africa as a young man in his early 20s. Colour-blindness had denied him a career as a pilot, but he pursued his engineering career with passion and ingenuity. According to his daughter Kim Schoepflin, Kwatani’s chief executive officer, he also loved mathematics and was convinced that everything had an engineering solution.

“Schoepflin said: “His success relied on this commitment to quality, technology and most of all his commitment to customers. He loved being on the mine site and was never shy to get his hands dirty working through the night to resolve whatever the problem was. He was so devoted that very often he would drive 12 hours through the night at the drop of a hat when the telephone rang.””

“She remembers him as a passionate teacher, giving interesting presentations on screen sizing that left a lasting impression on many customers in mining. “Even today, some of our competitors and suppliers use and refer to his sizing philosophies,” she noted.

“An enthusiastic reader and philosopher, Vogel also loved adventure and the African bush. Perhaps his most daring trip – together with his wife Maria – was by Landcruiser from Johannesburg to Hamburg, Germany. The 30,000 km trip took them seven months and traversed 29 countries on three continents.

“He was also a free thinker who opposed racial discrimination and devoted many years to supporting and building black businesses during apartheid. Significantly, Vogel laid the foundation for Kwatani’s transformation into a B-BBEE Level 1 company.

“Schoepflin said: “Being an exceptionally ethical man, he always fought for what he believed was right. He stood by his word and did not subject himself to any rules or regulations that he did not believe in. He remains a legend in the industry in which we operate.””