Lubrication Function Description; Construction Of Applicator Station Dryexx; Dosing Pump; Compressed Air Dosing Unit - ECOLAB DryExxEco Advanced-ETH Betriebsanleitung

5.3

Lubrication Function Description

When a lubrication circuit is activated a diaphragm compressed air pump is started and
the pressure of the conveyor belt lubricant in the system is raised. Following the fixed run
up period, the lubrication circuit valve opens for an adjustable period of time for
commissioning and the belt lubricant is applied via the nozzle system to the conveyor belt
tracks. The lubricant pressure required is adjusted by the compressed air filter regulator in
the applicator station. To achieve the optimal spray pattern, the pressure on the nozzles
should be 0.2 - 0.25 MPa (2 - 2.5 bar).
Once the set nozzle time (or spray) time has elapsed, the pump is stopped. The bleeder
valve in the applicator station is opened, which releases the pressure on the entire line
and nozzle system. The lubricant circuit valve is closed once the pressure relief process is
complete.
The pressure relief is carried out via a return line directly into the container. An empty
message is generated by a float contact in the suction lance and processed and displayed
at the control unit. The applicator pump used is dry-running protected and self-priming.
If the average pressure reaches the pre-set control air pressure, the pump switches off
automatically.
5.4

Construction of applicator station DryExx

A diaphragm compressed air pump supplies the belt lubricant, via a suction lance with an
empty detector unit, to the lubrication circuit with the nozzle fittings.
5.4.1

Dosing pump

The dosing pump used is a pneumatically driven diaphragm pump with a supply capacity
of between 0 - 25 l/min depending on control and backpressure.
Control of the pump is by a 3/2-way solenoid valve. The supply and pressure in the
system is set according to the control air pressure.
5.4.2

Compressed air dosing unit

The compressed air dosing unit consists of a filter regulator with a flange mounted 3/2-
way solenoid valve. The control air pressure of the pump is set by means of the filter
regulator and the solenoid valve switches the control air on or off.
5.4.3

Pressure release valve

A pneumatic controlled 2/2 way diaphragm valve is connected to the pressure side via a
T-piece. The activation is carried out via the connected 3/2 way solenoid valve. The
diaphragm valve is used to relieve the pressure on the system to a residual pressure of
approx. 0.08 MPa (0.8 bar) when the lubrication circuits are not activated.
5.4.4

Suction lance

The pump supplies the conveyor belt lubricant via a suction lance fitted as standard. The
suction lance is fitted with a float contact for to detect and provide a warning if empty. The
signal is processed in the control unit and the installation goes into fault mode until the
hopper reservoir is changed.
Functional description
Construction of applicator station DryExx® > Suction lance
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31 Rev. 02-09.2017