Maintenance of Dewatering Screen

1. Media Maintenance

With sizing screens, the purpose of the screen media is for the material to go through the openings. With a dewatering screen, the goal is to retain the material o the deck, allowing only the water to filter through. Dewatering screen media does not wear as fast as media used on sizing screens, but when it does wear, it should be replaced immediately. Although dewatering urethane typically tends to wear at the surface of the screen, instead of the openings, any wear that does appear at the openings will allow the materials to fall through the screen along with the water. in addition, because the openings are very fine, they can punch through or tear easily of stepped on or if tools are dropped on the screen panels. In order to ensure retained product, the media should be examined regularly for signs of wear or holes, and worn or torn panels should be replaced.

2. Vibrating Motors

For dewatering screens, high frequency vibrating motors is usually used; operators need to know that these motors run fast depending on the screen and motor. The motors generate a lot of force driving up and down. If these motors and their mounting apparatus are not kept properly maintained, they can destroy themselves rapidly and create safety hazards. As a standard step in safety and operating the machine efficiently, producers need to maintain the bearings on the motors, following manufacturer-recommended intervals. The motor’s manufacturer provides greasing schedules for the bearings, as well as startup procedures, which should be included in the screen manufacturer’s operation and maintenance manual. It must be made sure that bolts are tightened to the correct specifications. If the bolts or the frame are cracked, they need to be repaired immediately. Most manufacturers will recommend checking the torque on the bolts prior to initial startup when the unit is first installed, followed by regular inspections at least twice a year. Also the motor mount has to be inspected regularly and if cracks are found, they need to be repaired immediately.

3. Eccentric Drives

For eccentric shaft dewatering screens, the maintenance of the motors and bearings is similar to that of traditional sizing screens. The belt torque on the wheel case must check four times a year. It is a good idea to check the drive belt and sheaves daily, as well as for leakage from the drive shaft seal. The pillow block bearings should be greased every couple of weeks or according to recommended intervals. While dewatering screens are not that maintenance intensive, understanding how they perform and what maintenance is important will guarantee long-term success.

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