Floor Screed Machine HD 50
36
www.utiform.com
departamento.té[email protected]
Tfno. + 34 96 570 29 82 Fax: + 34 96 570 29 83
8.6 Unit
operation
When the machine is started, air enters through the aspiration valve ( normally open) to the compressor
and when it has been compressed it passes to the separator tank. From this tank it passes through R1, Y1 and R3
and arrives at the aspiration cylinder CA closing the aspiration while at the same time through the R2 air arrives
at the speed variator cylinder which causes the motor to turn at minimum revolutions.
Thus, the diesel consumption is minimal and there is no air production.
Electrovalve Y1 is activated by two contacts situated parallel to each other (see electrical diagram), one
on the lid of the mixer so that it is activated when the lid is closed, and the other is on the control panel and is
manually activated so that it is possible to continue working when the lid contact is malfunctioning.
When Y1 is activated, the passage of air to CA, with which the aspiration opens and the motor
accelerates to its maximum r.p.m. this permits nominal flow of the compressor.
If maximum working pressure is reached in these conditions this transmits the proportional regulator RP
which overcomes the force of the spring (opposed to CA in the assignation valve) and this closes the valve. At
the same time the air passes through R2 contact in order to act on the VV cylinder reducing the speed of rotation
of the diesel motor
When the pressure drops due to the consumption demand, the cycle is inverted.
If at any time the electro valve Y1 is de-energized, there is a return to the initial closed aspiration
situation with the motor idling
.
When the machine stops the pressurized air in the screw returns to the aspiration valve. This pressure
overcomes the internal spring of the discharge valve (VN), which opens it and the remaining air in the tank is
released.
8..6.1 Air circuit
The air is taken in through the air filer FA and after passing through the aspiration body
OA
it is
compressed in compressor C together with the oil injected by the main injection principal IP. This mix is
carried to tank D where it is centrifuged and most of the oil is deposited at the bottom of the tank. The
remaining oil is collected in a separator filter FS, and the air without oil reaches the mixer.
8.6.2 Oil circuit
Oil is injected into the compressor through the main injector IP, having passed through the calibrated
opening OC1 (in this way it injects just the right amount of oil) and the oil filter FC.
Having been separated from the air in tank D, it is carried through conduct A, to the oil cooler of the compressor
RACC where it is cooled by air moved by the fan VTR. Once it has cooled the oil is carried once more to
injection IP.
8.6.3
Returned low grain size material circuit
Remains of oil collected in the separator filter FS are drained to the compressor through the low grain
size material pipe TF, and injected into the compressor by the injection of low grain size material IF, once it has
passed through the non-return ARF and through the calibrated opening OC2.
8.6.4
Motor oil circuit
The motor cooling oil cools in the motor oil radiator RACM using the air moved by the fan VTR.
