Machine type: Encased stationary screening plant

Doppstadt SST screening stations are developed especially for plant construction. They enable the separation of the material in two or more screening fractions thanks to a choice of equipment. Due to their large drum diameter (2,500 mm) they are frequently used in the field of household rubbish and industrial waste recycling and for building construction waste screening.

SST drum screening station

The Doppstadt screening machines in the SST range have been specially developed for systems engineering. With optional equipment, these allow the separation of the feed material in two or three fractions. With their large drum diameter, they are ideal for treatment facilities for household and commercial waste as well as for screening mixed construction waste.

Drum screening station - SST 1525 E

Drive:
The drum is driven by 4 spur wheel back-geared motors which drive friction wheels via elastic couplings. The Vulkolan-coated friction wheels transfer their torque to the mechanically processed running surfaces of the drum. All drives are situated outside the drum drive area, making it easily accessible for maintenance and cleaning work.

Drum movement:
The screening drum is mounted on axial and radial rollers. The axial rollers consist of two Vulkolan-coated heavy load wheels each on the input and output sides. The radial rollers consist of a total of 16 friction wheels, also coated with Vulkolan to ensure low-noise operation.

Base drum element:
The screening drum is designed as a two-part rolled welded structure with a wall thickness of 8 - 15 mm, depending on the application. Mesh sizes from 15 - 200 mm are available. The material transport within the drum is carried out by the welded-on transport screw which guarantees high screening quality. The drum jacket area is smooth so that a cleaning brush or scraper can be applied. It is possible to replace the drum from either the left or right side (for instance to change the perforation). The running surfaces of the drum are mechanically processed to ensure high concentric precision as well as a low-wear, jolt-free load on the drive.

Machine frame / body:
The basic structure of the machine frame is a profile steel tube structure onto which the various attachments for drive, rollers, protective doors and chutes are mounted. 4 large-surface protective doors are swivel-mounted on each of the long sides. When open, the drum can be lifted out from the side (for instance to replace the drum). To reduce dust and noise, the entire drum area is enclosed on top with screw-on cover plates. The roof area is equipped with pipe connection pieces and flange connections so that a dedusting facility can be connected. The basic frame includes all material guiding panels and chutes, both in the drum entrance and exit areas as well as in the fine grain collection area. The front-side material chutes are equipped with rubber inserts to minimize noise and wear.

Maintenance, inspection, repair:
The drum is generally cleaned automatically by the cleaning scraper situated against the outside of the drum jacket. For special thorough cleaning, the two-panel side doors can be opened.

All lubrication work is performed from the central lubrication blocks located in the accessible area beneath the drum.

A maintenance catwalk is mounted on the machine frame on one side. The associated stairs are included as standard. Stairs and rails are constructed in accordance with the relevant regulations with grid panels and grid stairs. All railings include hand rail, foot and knee bars.

Inspection openings are provided in the machine cover at the important material transfer points. The drum exit area can be walked on.

All drives are situated outside the drum operating area, making them easily accessible for all cleaning work.

Description:

• Stationary drum screening station with screening drum, specially developed for systems engineering.
• completely enclosed.
• for diverse applications.
• drum diameter 2,500 mm.
• drum length 10,000 mm.

The screening drum is designed as a two-part rolled welded structure with a wall thickness of 8 - 15 mm, depending on the application.