Pelletizer up. the pressure roller and the ring die clearance adjustment

The granulating machine pressure roller and the ring die of shallow 2019 - clearance adjustment 02 - 24 the clearance between the ring die and roller is one of the important parameters of pelletizer operation adjustment, the adjustment process is also pelletizer one of the important steps before operation, the rationality of the clearance adjusting directly affects the use performance of the granulator. The correct adjustment can make the pelletizer for maximum manufacturing costs and save the product cost, improve the economic benefit. 1. Under normal circumstances, the ring die direction of rotation is clockwise, as is equipped with two roller granulator, start the installation should be left when roller roller the biggest eccentric chime installed inside a ring die sits on the left, the right side of the roller's maximum eccentric chime installed inside a ring die right half area; Such as more than equipped with roller granulator, also should guarantee as eccentric adjustment piece of ring die rotating in the opposite direction of rotation, roller pressure should be to move in the direction of the connection and ring die, otherwise roller installation is not correct, should be installed according to the above requirement. 2. The clearance between the ring die and roller is commonly 0. 3mm- 0. 5 mm, usually during adjustment to the outer surface of the roller contact with the inner surface of the rotating ring die slightly, and the ring die led to turn a turn. Under normal circumstances, both die small clearance, die hole of the larger; New die clearance, old die gap is big, if the pressure roller and the ring die gap is too small, pressure roller and the ring die wear and tear, and the noise is bigger, on the other hand, the gap is caused by discharging difficult. 3. But the ring die and roller after heat treatment the roundness are generally a bit out of shape, regulating the application of the maximum outer diameter of the roller into contact with the smallest diameter of ring die, the gap is still 0. 3mm- 0. 5 mm, this regulation is usually called jump contact adjustment, if such once roller minimum outer diameter and the ring die maximum diameter contact will generate additional radial force ( Impact load) Sound, and the abnormal metal friction. 4. Generally granulating machine roller, ring die is mounted with cantilever beam, due to the effect of additional radial force, is a cantilever support bar, through the press roll transfer reaction in the ring die, makes the ring die under periodic alternating stress, ring die roots fixed ring wear loose, so that the fixed ring die screw under shear stress, shear stress for a long time under the action of shear fracture that generates screw root. Second, additional radial force through the press roll to bearing, although used to support the roller rotating bearing adopts cone column bearing can absorb a certain amount of radial and axial load, the bearing under normal load for a long time is easily occurs due to the bearing inner and outer ring raceway, ball work on the surface of the local stress exceed the material yield limit of the plastic deformation failure, show the bearing inner and outer ring and ball has obvious uneven wear pits on trace, in the event of plastic deformation failure, bearing friction torque increase, rotating accuracy decline, such as plastic deformation exceeds a certain value the bearing temperature rise rapidly, burns grease, bearing cage deformation, the bearing jammed and failure. Because of the roller bearing inner ring is fixed outer ring rotation, such as additional impact load is obvious, the failure of bearing cage somewhere will be found to have broken phenomenon obviously. 5. The clearance between the ring die and roller not only influences the granulator discharge is difficult, but also affect the pelletizer itself life, as often happens in the process of granulating machine operating ring die clamping screw fracture and roller bearing damage phenomenon, in the case of no other obvious reason, generally all is ring die, gap between roller round and loss caused by too small.