Ultra-compact customised belt conveyors

The trend towards ever-smaller ­products is increasing. For this reason, assembly technology equipment is now also operat­ing with ever-smaller components. Belt conveyors just like those that work with standard-sized components are now being offered for transporting high unit loads safely. Optimised to meet the special requirements of transporting small items, in many cases they are the product of choice. Robust materials and durable, maintenance-free components ­guarantee high operational ­functionality over long periods.

In the world of manufacturing there are still a few areas in which it is quite suffi­cient to transport components manually from one section to the other, but, for high unit loads, automated solutions have become essential. With this in mind, ­Henry Ford deployed belt conveyors for mass production even back in his day. The ­Vetter engineering company is proving with its micro belt conveyors that this principle is transferable to assembly technology for small components.
And their compact, modular concept can also be tailored to accommodate special user requirements. A compact design also requires compact drives, and for this reason the manufacturer works with the microdrive specialist Faulhaber, based in Schönaich. This has given rise to a whole range of standard and customised compact belt conveyors.

Enclosed design

Conveyance means movement. Small ­components in motion do, however, tend to "go astray" once in a while. In order to ensure smooth production, it is essential that nothing gets jammed in the conveyor belt. To avoid any such disruptions and at the same time facilitate easy, rapid ­integration into existing or new installations, the manufacturer utilises a ­completely encased, "motorless" conveyor belt. All key components of the conveyor system are completely enclosed, with a smooth outer surface, and are almost completely covered by the actual belt ­itself. This in turn provides usable area only, without any awkward (drive) attachments. The cleverly designed modular structure makes assembly much easier, and even variants for special requirements can be supplied virtually on a ready-to-use basis.
A belt conveyor must provide the right user-specific width and length. On top of this there is automatic pre-tensioning of the belt and a drive. The modular design meets ­these requirements perfectly: the idler roller for the conveyor belt is connected to an ­aluminium-section "supporting element" that can be cut to the individual length required. The belt is driven by another module comprising a microdrive and a roller drive on the other side of the supporting element.
If the supporting element (which is only needed for the variable length) is omitted, the overall length of the conveyor unit can even be scaled down to 200 mm – with a height of just 30 mm and a width of 60 mm. The drive integrated into the belt conveyor has none of the troublesome, protruding components that make installation more difficult.
All this can only be achieved by using extremely compact drives that are much ­narrower than the diameter of the transportation unit or the idler rollers. Depending on the conveyor design, the manufacturer uses either 16-mm EC servomotors or DC drives of 23 mm to 35 mm diameter from Faulhaber.
These motors come with a long-life plan­etary gearhead as a pre-assembled unit, thus combining motor and gear mechanism. The drives can be integrated well into the ­standard belt conveyors in sizes 20 – 40, 30 – 60 and 40 – 80 (installation height – installation/belt width in mm). Wider ­conveyors too, such as the 40 – 120 and 40 – 160 versions, are available, as are special solutions based on the same principle, such as ascending conveyors.
The motors are supplied with 24 V. The belts can be operated at different speeds thanks to variable gear reduction. For special cases requiring infinitely variable speeds with very sensitive adjustment, there is an additional speed controller and, for the ­variants with EC servomotor, the speed ­control comes as standard.
All moving parts of the belt conveyors and of the drive are completely enclosed, with lifetime ­lubrication, thus ensuring mainten­ance-free operation.

Variable installation sizes and lengths rapidly achieved due to the modular concept

Compact drive power

The drive is key in determining the ­reliability of the belt conveyor. Microdrives, however, follow their own rules. Drawing on their many years of ­experience, the specialists from Schönaich are able to supply drive units that are optimised down to the last detail. The drive unit comprises inexpensive, durable graphite-commu­tated DC motors that can be controlled ­easily in combination with planetary gears. Particularly with microdrives, its is the special design that is key to a long service life.
High input speeds and a high output torque make special demands on ­materials, tooth geometry, bearing positions and above all on the lubricant. When properly dimensioned, these drives provide many years of maintenance-free service.
If something even smaller is required or if continuous operation is a priority, then the preferred option is electronically ­commutated motors (EC motors). They are not subject to any brush wear, can be mass-produced all the way down to 1.9 mm diameter and can be equipped with gears with a diameter corresponding to the motor. The drive unit is either ­integrated into the motors or is external and, as with DC motors, affords sensitive, infinitely variable control of speed and torque.
Faulhaber supplies state-of-the-art microdrives in a vast array of designs for any application. If the drive specialist is involved in project development from the outset, optimised, perfectly adapted ­solutions can be implemented. In addition to standard drives, tailor-made and ­modified specialist solutions can be ­created at a reasonable price if planning begins early on.

Small belt conveyors are suitable for a
variety of transportation tasks
Compact drive integrated into belt conveyor