Diary and Events
Messe Stutgart, Germany
28/03/2017 - 30/03/2017
As the world’s leading exhibition for the fastener and fixing industry Fastener Fair Stuttgart (more)
Manchester Central Convention Complex(M2 3GX)
04/04/2017 - 05/04/2017
Industry 4.0, the 4th industrial revolution, smart manufacturing, digital factories…these are (more)
Arena MK, Milton Keynes(MK1 1ST)
The new Machine Vision Conference & Exhibition gives you insight into the latest developments in (more)
The alternative conveyorGrouping work stations closely together has great merit in minimising material movement and conserving valuable floor space. But it means production flow needs to follow increasingly complex circular and oval paths, not a format that is easily handled by most commercially available linear guide and actuator systems. The traditional conveyor designs that accommodate multi-curve linear guides and actuators often lack precision and positioning accuracy.
So what\'s the alternative? Well, one solution is the vee-bearing based precision ring and track. This can provide a solution that is superior in both its performance and application flexibility. A vee-bearing based ring and track system can offer better positioning accuracy and precision - benefits which are particularly important when the payload is fragile or must be held rigidly and accurately positioned on the process line.
In rotary motion it is possible for the vee bearings to be statically mounted and the ring slides rotated relative to them. HepcoMotion circular and track systems can also be converted for actuation with the addition of components such as carriage linkages, drive elements and motors. Carriages can follow either, straight or circular paths through the use of straight and ring slide segments. A wide choice of profile sizes, load capacities, slide lengths, curvature radii and angular spans allow the optimum system to be created for the task. Complex bi-directional paths are easily achievable using bogie carriages. In addition, ring and track systems also requires less space, support structure and maintenance.
This is because the payload size can greatly exceed the width of its carriages with appropriate mounting fixtures.
A good example is the PRT2 precision ring and track system from HepcoMotion. Central to PRT2 are concentric and eccentric vee groove bearings and vee edge slides. These have complementary vee profile running surfaces which allow the vee-bearing equipped carriages to run smoothly along the vee guides, resisting lateral or rotation movement, even under high applied loads.
Flexibility is extended with options such as ring disks and slides with integrated racks for actuation by pinion gears. And of course an important benefit of any HepcoMotion system is that stainless steel is a standard choice. So a ring or track system can be specified with the best combination of corrosion proof elements for food and pharmaceutical production. Vee bearings usually contain enough lubrication to last their expected running lives and can be specified with Nitrile seals to minimise lubrication loss and ingress of debris. Clean component design ensures debris doesn\'t get trapped.
Pre-loading against slide
HepcoMotion ring and track systems are designed to be firmly pre-loaded against the slide, ensuring the carriage\'s stability along its path of travel. This superior performance isn\'t easily achieved on a roller conveyor system that is un-powered or whose payload is moved by gravity or manually.
The HepcoMotion vee-based system offers advantages of slewing rings too, which are often specified with machined gear racks into their races for direct driving. Slewing rings do offer good accuracy and smoothness and can have payload mounted to them but they are generally not pre-loaded, a factor that considerably enhances rigidity and smooth movement. Also such systems are generally supplied fully assembled and their components cannot be exchanged. If a component fails, the entire ring often has to be replaced making them difficult to service in the field. However, thanks to their common fit design, individual components can be easily exchanged on a HepcoMotion ring and track system.
Vee bearings can have a significant size advantage over slewing rings in applications requiring less than 360° of travel. A slewing ring has to provide a complete circuit of travel regardless of the application\'s needs whereas in a vee-bearing system the ring slide segment arc length only needs to be long enough to support all the vee bearings. This can be as few as three throughout the full arc of travel.
In conclusion ring and track systems can greatly improve payload transportation, simplify handling and boost efficiency. They offer design flexibility, are easily adapted and upgraded and, for almost all applications, they outperform other types of non-linear guides and actuators.
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