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