Z47 Maintenance Manual
-- Z-Belts are driven by plain cylindrical drums (diam. appr. 1 mtr). Toothed driving wheels/drums are not possible. Consequently, therefore is the need to have the belt set up with a certain tension. In normal use, the reverse drum will be forced mechanical, hydraulically or pneumatically to give the belt its tension and prevent it of slipping and to handle the elongation of the belt. Elongation caused by a difference in temperature, product load or weariness. Because of the plain drums the belt has to be steered all the time. This has to be done by plain steering rollers just for and or after the driving drum. The position of the belt in the oven has to be controlled all the time. Sometimes the driving drum itself is in use as a steering roller. The driving gear must be positioned in such a way that the loaded part, usually the upper part, is pulled off the belt. A pushing driving gear must be avoided.
-- The upper part of the belt usually is supported by wearing profiles attached in a frame across the belt. An often-used material for these profiles is cast iron. The return part can be supported by bearingmounted rollers. The belt will sag slightly between the rollers.In the oven belt obstruction points must be prevented. This means that the supporting be bevelled off sufficiently. In the horizontal direction the belt should not be allowed to catch on sharp pieces or supports.In order to have the belt running well and to contribute substantially to the belt’s life span, it is important that the frame with the sliding profiles is level and width wise horizontal, and that the driving and reverse shafts are properly aligned in relation to the supporting frame. These shafts must be mounted at right angles to the running direction of the belt and should be in the same horizontal plane as the support. Both shafts must be assembled parallel to each other.
2. Belt Installation
-- The belt can best be pulled in by means of the driving motor. The rolled-up belt is placed centrally in front of the driving shaft. The initial point of the belt is fixed to a cross-slat by several links. A cable runs from the cross-slat to the reversing shaft and back to the driving shaft. The cable is twisted around this driving shaft a couple of times. The belt is pulled over the guide of the returning part (rollers) by running the motor and pulling the cable tight. At the end of the oven the cable and cross slat can be pulled over the reversing drum and the belt can be pulled over the support of the upper part. The cable can be removed when the initial point.
-- The Z47 Belt needs minimal maintenance. Belt cleaning is most effective when raising the oven temperature up to ca. 350 degrees C. and than brushing the ‘product’ out of the belt with a rotating brush. In case of the carbon steel belts do not use water or steam with or without detergents for cleaning. This will make the belt rusty and the live time will be effected negatively. Beware that during production or cleaning, the belt never runs direct into a flame. The high temperature of the flame causes the temperature of the belt to be much higher and can affect its quality.
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