Roller pitch is so selected that the load is supported by at least two driven rollers. To prevent sagging of the load between two driven rollers, non powered (idle) rollers may be introduced between two driven rollers.
(ii) Frames: The rollers are supported at their journals on two set of frames at two ends. The frames are connected by heavy tie rods to make a composite frame structure suitable for grouting the conveyor frame on its foundation. For a heavy duty conveyor, the framework is usually made from cast steel, and for a lighter duty conveyor, the frames may be fabricated from rolled steel plates and sections. Design of the frames largely depend on the drive system employed.
(iii) Drive arrangement: Major classification of powered roller conveyor is based on the type of drive arrangement employed. When one motor drives more than one or all the driven rollers, it is called Group or Multiple drive. In group drive, generally only one motor with suitable transmission arrangement is used to drive all the driven rollers. For a long conveyor, or from other considerations, more than one motor may be used, each driving a group of rollers in different sections of the conveyor. The transmission of power from the motor to the rollers vary widely depending on use.
In a heavy duty non-reversing conveyor, bevel gear transmission arrangement may
be used. The motor, through a gear box drives a shaft placed along the length of the drive side of the conveyor. Power to all the rollers are through set of two bevel gears as shown in Fig. 6.6.5. The drive shaft with supporting bearings and the bevel gears are housed in the box frame, and partially immersed in oil for lubrication. In an alternative design the transmission of power may come to one roller, and the other driven rollers may be connected to this driven roller by series of sprockets and chains.
Roller pitch is so selected that the load is supported by at least two driven rollers. To prevent sagging of the load between two driven rollers, non powered (idle) rollers may be introduced between two driven rollers.
(ii) Frames: The rollers are supported at their journals on two set of frames at two ends. The frames are connected by heavy tie rods to make a composite frame structure suitable for grouting the conveyor frame on its foundation. For a heavy duty conveyor, the framework is usually made from cast steel, and for a lighter duty conveyor, the frames may be fabricated from rolled steel plates and sections. Design of the frames largely depend on the drive system employed.
(iii) Drive arrangement: Major classification of powered roller conveyor is based on the type of drive arrangement employed. When one motor drives more than one or all the driven rollers, it is called Group or Multiple drive. In group drive, generally only one motor with suitable transmission arrangement is used to drive all the driven rollers. For a long conveyor, or from other considerations, more than one motor may be used, each driving a group of rollers in different sections of the conveyor. The transmission of power from the motor to the rollers vary widely depending on use.
In a heavy duty non-reversing conveyor, bevel gear transmission arrangement may
be used. The motor, through a gear box drives a shaft placed along the length of the drive side of the conveyor. Power to all the rollers are through set of two bevel gears as shown in Fig. 6.6.5. The drive shaft with supporting bearings and the bevel gears are housed in the box frame, and partially immersed in oil for lubrication. In an alternative design the transmission of power may come to one roller, and the other driven rollers may be connected to this driven roller by series of sprockets and chains.
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