Schwing 30100750, Руководство по эксплуатации

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Maintenance
All S P Rock Valve Model s
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Operation Manual -
121
Push the emergency stop button on the operator’s
panel. Stop the engine and put the key in your pocket.
You may have to slightly rotate the dog bone to align
the bolt holes with the cylinder flange. When aligned,
coat the 2 remaining M20 bolts with Loctite and install,
including the cone washer sets. Once all 4 bolts are
started, you may tighten the bolts to the torque spec for
M20 10.9 bolts (420 ft/lbs).
Repeat the previous steps for the right side ram.
Open the shut-off valve. Note that the unit will not
cycle with this valve closed.
Changing the Material Cylinder s .
The material cylinders eventually wear out. They are
considered worn out when the chrome starts to wear off
the barrel. Normally, the end attached to the Rock
Valve wears out first, because it sees the most concrete.
The waterbox end may be in like-new condition,
because that end never experiences concrete. For this
reason, the material cylinders were designed to be able
to flip end for end. That way, you can move the worn
out part to the waterbox, and the like-new part to the
concrete valve for double the life. If you are going to
do this, you have to catch the wear on the material
cylinders before they get too thin or break through in
one or more spots. Once that happens, you cannot flip
them, because they will be structurally too weak to
hold the pressure forces at the waterbox end.
The procedure for changing and aligning the material
cylinders is the subject of Service Bulletin G-102/88.
Contact the Schwing Service Department at (651)
429-0999 or 678-560-9801 if you need a copy of the
bulletin.
Tier IV engine Regeneration Control Logic
Regeneration Operation:
The following section explains how the engine control
system monitors and manages the exhaust after
treatment system. Primarily the system works
passively, using the Diesel Oxidations Catalyst (DOC)
to reduce particulates and promote the production of
NO 2, which is used for oxidations of Particulate
Matter (PM) in the Diesel Particulate Filter (DPF).
These chemical reactions will occur when the gas
temperature into the DOC is greater than 250°C. This
chemical process is known as ‘Passive Regeneration’.
The engine control system will monitor the exhaust
system temperature and engine duty to predict the
amount of soot accumulating (if any) in the particulate
filter. The engine control system will elevate exhaust
system temperatures to initiate ‘Active Regeneration’ if
there is insufficient passive regeneration or if the
maximum time between active regenerations has been
reached. When triggered the engine control system will
elevate the exhaust system temperature to increase the
DOC temperature. Once the target DOC temperature is
reached the control system will introduce
hydrocarbons into the exhaust gas stream. The
hydrocarbons will oxidize across the DOC, for thermal
oxidation of the particulates in the filter.
Regeneration Normal Operation S tate s
S tate 1 - Primary Operation.
The system is designed to passively regenerate during
engine operation. A typical machine duty cycle should
be sufficient to promote good levels of passive
regeneration. The solid line in Figure 63, State 1,
shows the level of soot rising and falling over time. The
system passively regenerates at different levels
dependant on machine duty and DOC temperature, the
soot level always staying below 90% soot loading.
S tate 2 - Active Regeneration
The engine control system predicts the level of soot
accumulation in the particulate filter. If the engine duty
cycle does not allow sufficient exhaust temperature for
passive regeneration, soot accumulation will continue
to rise.
When optimum soot loading is reached, between 90%-
130% and all of the preconditions are met, an active
regeneration will start. Active regeneration will reduce
soot loading to approximately 20% at which point
active regeneration will stop. During automatic active
regeneration normal operation of the machine can be
continued. State 2 shown in Figure 64 shows an
accumulation of soot above 90%. The conditions for
automatic regeneration are met at point A
‘Regeneration Active Lamp’ is illuminated, soot is
reduced to 20%.Active regeneration will be triggered
20 engine hours from the last active regeneration if the
soot model has not triggered sooner. If regeneration is
required and the engine speed is above 1200rpm
automatic regeneration will start. Once started the
engine speed may fall below 1200rpm, however the
speed must not fall below 950rpm.The low idle speed
will be temporarily modified to 950rpm during
regeneration if it is normally below this threshold.
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