The cleaning system is mounted above the respective starscreen unit.
The distance between the screen stars and the cleaning system is sufficiently large ensuring an unrestricted material flow during the screening process.
Cleaning can be electrically or hydraulically controlled depending on model (corresponding to the upstream screen fractions). The functioning principle is the same for both versions.
Cleaning will only commence as needed and this facility is also initiated dependent on the version installed and coordinated with the respective application. The application can be initiated, for example, by a preset pressure of 140 bar which can be entered user-friendly and updated in Stored Program Control when in hydraulic operation or also via a defined time slot as well as application-specifically by manual operation.
The number of cleaning combs is adapted to the respective starscreen unit and the individual application and can be unproblematically restored to the original condition or extended.
These cleaning combs allow cleaning of the “hubs” with their use, i.e. the area between the screen stars and cleaning the areas between the sieve-screen fingers.
The cleaning system is individually adapted to the screen star and to the separating facilities. The cleaning process is initiated and terminates feeding. This can take place, for example, by stopping the material hopper or a feeding unit. The screen deck will start “freewheeling” in the following seconds so that there will be no material any more on the area to be cleaned. This section is being closed in few seconds. When lowering the sieve-screen combs while the sieve-screen deck is operating, the sieve-screen fingers are being influenced in their position to each other by slight pressure This has the effect of freeing up material caking to almost 100 % from the spaces between the fingers and the material is then laterally reintroduced into the screening process via the hub area.
The subsequent offset around the shaft center distance enables cleaning of the hub.
With the sieve-screen fingers briefly cleaned, the cleaning unit is then returned to its home position against the running direction of the screen star.
This action will clean the fingers on the following screen shaft a second time.
In summary, the cleaning system provides the following advantages:
optimum utilization of capacity
no unwanted wear developing thanks to using the cleaning system only when needed vs. permanent cleaning.
cost-reduction thanks to reduced energy requirement.
constant screen cut
high material throughput maintained also over a longer period
cost reduction through lower level of wear on the screen stars.