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Lubrication-free linear guides for smooth operation

09 July 2022

THE K900 industrial robot from KEMARO cleans floors wherever it needs to, autonomously and without programming, even in places where it is potentially dangerous or even impossible for people to clean. Lubrication-free linear guides, shafts, plain and fixed flange bearings from igus all play a crucial role in the robot’s mechanics.

Whether it’s a warehouse, production facility or industrial plant, the K900 cleans without chemicals or water, leaving the floor clean and – crucially – dry. Due to its low installation height, the robot cleans even in places that are hard to reach or potentially dangerous for people to access. Commissioning is very easy and fast and requires little or no preparation time or programming.

The user simply places the K900 in the desired location, plugs it in, charges it and the autonomous cleaning can begin.

The sweeping robot is designed for cleaning areas up to 10,000m2. It has a battery run time of up to five hours, an integrated dust extraction system, a cleaning width of 90cm and a dirt container with a capacity of 35 litres. “As it travels, our robot creates its own cleaning map, identifies and bypasses fixed and mobile objects, and cleans its environment completely independently,” says KEMARO co-founder, Martin Gadient. “In the case of cleaning robots for industry, we are currently the only company in the global market that can simply place the robot in a room and start it at the push of a button. There is no need for prior space measurement or teach-in.

“From my past work as a development engineer, I already knew the products from igus, and my experiences with them had always been good. For our size and the confined space conditions, we needed a strong and robust linear guide that was made-to-measure. We contacted igus and a short time later, we ordered a sample of the desired linear guide for testing from their website."

Axel Ebert, key account manager bearing technology at igus Switzerland, adds: “You can easily order a sample guide from us via our website – also made-to-measure from customer drawings. Due to the required strength, we decided on a drylin T linear guide in HD (heavy-duty) version in coordination with KEMARO AG.”

Profile guides of the drylin T type are dimensionally identical to the usual lubricated ball guides. In contrast, noise is reduced with the drylin t guides, as is the surface pressure due to the larger contact surface between the guide and the profile rail. In the heavy-duty version, the slides have a very firm hold in the carriage body. The drylin T carriage guides can handle loads up to 14,000N, are extremely resistant to dirt and have a very long service life.

“That’s another advantage of igus products – they’re all lubrication-free and therefore ideal for our application. The customer never has to lubricate, so no dust sticks to the guides and no abrasive paste can form," says Gadient.

Aluminium is used for the shaft material. “At first we had a chrome steel shaft that we kept having problems with,” says Gadient. “Axel Ebert then suggested an aluminium shaft from the igus portfolio. Initially I was very sceptical, but after the first test I was completely thrilled. It is both lighter and also easier to assemble and works perfectly,"

For more lubricant-free benefits: in addition to the carriage guidance, the fixed flange bearings, plain bearings and thrust washers from igus are also used in the robot.

“Our igubal spherical bearings, which are used in the roller brush bearing, are maintenance-free, self-aligning bearing elements made entirely of plastic. In addition, the entire igubal joint system is insensitive to dust and dirt, resistant to corrosion, and 80% lighter than metal bearings," says Daniel Henlin, sales manager at igus Switzerland, emphasising the advantages of spherical bearings made of high-performance plastics.

By using the igus lubrication-free bearing technology, KEMARO was able to make its autonomous sweeping robot quieter, more robust, lighter and also more durable. And it also requires less maintenance.