Swing arm lifting limitation system
1. Swing arm lifting limitation
When swing arm operation handle is pulled to the rear limitation position, swing arm operation handle
will be gripped by swing arm lifting electromagnet (4) (swing arm operation handle will not return to meso
position after loosening hands), swing arm will keep lifting; when swing arm reaches the limitation, proximity
switch (7) works, its terminal ―0‖ and ―-‖ are connected, coil of lifting relay (2) is power on and works, its
terminal ―30‖ and ―87a‖ disconnect. Lifting limitation electromagnet (4) and float electromagnet (5) are power
off and lose suction ability, swing arm operation handle will return meso position automatically with the effect
of resetting spring, lifting hydraulic circuit of cylinder is cut off, and swing arm does not lift again.
2. Swing arm floating device
When swing arm operation handle is pushed to the limitation, swing arm operation handle will be
gripped by swing arm floating electromagnet (5) (swing arm operation handle will not return to meso position
after loosening hands), at this moment, swing arm is at floating state, the swing arm operation handle will
return meso position when releasing swing arm floating state. When swing arm descends, it can be pushed
to flating position, swing arm will descend with effect of dead weight. At this moment, the driver can operate
other items (such as flat bucket) with the right hand, thus working efficiency is improved. Push swing arm
operation handle to floating position during slicking, bucket will rise along with rising of ground, and will not
damage the road.
Automatic bucket laid flat system
When bucket is at material discharging state, pull bucket operation handle to rear limitation, since
proximity switch (8) is at suction state, its terminal ―0‖ and ―-‖ are connected, automatic laid flat relay (3) coil
is power on and pulls in, bucket operation handle is gripped by bucket collecting holding electromagnet (6)
and keep at the rear limitation position (bucket operation handle will not return to meso position after
loosening hand), bucket will keep rotating backward until reaching limitation, proximity switch (8) acts, its
terminal ―0‖ and ―-‖ are disconnected, automatic laid flat replay (3) is power off and disconnect, bucket
collecting holding electromagnet loses power and gripping ability, bucket operation handle returns to meso
position with effect of resetting spring, bucket stops rotating, swing arm descends, when bucket reaches to
the ground, bucket bottom is flat with the ground.
Proximity switch
Operating distance10mm ± 1mm
Operation indication light Indication light is on
when proximity switch is acting.
SPC000025 Electrical System
Page 26
Figure 12. proximity switch
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