Therefore, when {TAIL ~ die cylinder} operates for the wheels to move relative to the propped block, the head member can be adjusted in {HEAD ~ height} together with the connecting block 
Therefore , when { TAIL ~ die cylinder } operates for the wheels to move relative to the propped block , the head member can be adjusted in { HEAD ~ height } together with the connecting block
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH