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D
ESCRIPTION
C
HAPTER
4
THP 94/42 R 4 XXT
THP 125/42 R 4 XXT
THP 140 H/42 R 4 XXT
GB-07.2005
4-6
4.2.2.6
Method of operation of the concrete pump
The concrete pump operates as follows:
The oscillation cylinders are in position S13. On pumping the pressure relief valve Y3 is electrically actuated and
closes, and Y4b is started. The drive cylinders move in direction “A”. The concrete in the left hand conveying
cylinder is pushed into the S-valve into the conveying pipe.
Concrete is sucked into the right hand conveying cylinder through the free opening in the hopper. As soon as
sensor S12 trips, valves Y4b and Y5b are started. The drive cylinders remain stationary and the oscillation
cylinders start to move in direction “C”. The S-valve is now in line with the right hand conveying cylinder. Sensor
S14 starts Y4a (and Y5b stops), and the drive cylinders move in direction “B”. The right hand conveying piston
now pushes concrete through the S-valve and the left cylinder sucks concrete in from the slide housing. Sensor
S11 stops Y4a and Y5a swings the S-valve back in direction “D”. A full cycle is now complete.