Introduction To Gramac Quartz Belt Curves

Proven Track Record

Gramac Quartz Belt Curves have a proven track record of longevity and reliable operation around the globe in a variety of environments and industries including: post and parcel handling, airport baggage handling, warehouse and distribution centres, refrigerated storage units, print and packaging, laundries, cement, plaster and building materials, horticultural and garden fertilizer and compost products and many other general manufacturing and industrial applications where changes in direction of conveyed objects are required.

Robust Design

The Gramac Quartz Belt Curves robust and patented design consists of a strong and rigid frame fabricated from steel section and plate rolled and formed to give the desired angle and radius. A stiffened smooth steel slide bed is mounted within the frame to support the belt and over which the belt slides.

Tapered End Pulleys

Supported at each end of the curved frame by 'life greased' ball bearing units fixed to it are tapered conical pulleys manufactured in high density polypropylene on a steel shaft. These two pulleys can be adjusted in the horizontal plane by tensioning devices to provide the correct amount of tension in the belt which fits over them.

Maximum Power Transmission

At one end the drive pulley is coated / lagged with a non-slip, highly wear resilient and heat resistant material which positively grips the underside of the belt. The taper of the pulley allows it to engage the belt across its full width, even at high speed, and ensures maximum power transmission from a suitably sized geared motor unit fitted to the shaft of the drive pulley. This method of driving the belt is known as 'Friction Driven'.

Positive Belt Tracking

With any belt curves the tendency is for the belt to displace towards the centre as it travels. To Keep the belt running on the correct line Gramac Quartz Belt Curves use a method of positive tracking. The belts are supplied with roller bearings fitted to the reinforced outer edge of the belt which then run on guide rails built into the outer perimeter of the steel frame.

Fully Guarded

All Gramac Quartz Belt Curves are supplied with safety guards fitted to eliminate trap points and prevent inadvertent access to moving parts such as the roller guide bearings. These guards are designed to be lightweight for easy removal for maintenance purposes. Underside guarding is provided as standard.

Specifying GQ Belt Curves

There are three main dimensions which suffice to determine belt curves geometry. They are the subtended angle of the belt curves (A), the effective belt width (W) and the effective radius of the belt curves. The radius can be given as one of the following: Ro = the belt’s effective outer radius, Rcl = centre line radius and Ri = the belt’s effective inner radius. It is important to be clear about which one is being used.

The nomenclature adopted by Gramac Quartz when designating its ranges of belt curves models uses the outer radius dimension, for example:

Model Designation: