DRIVE CONTROL DEVICE FOR TRAVEL CARRIAGE FOR LOADING AND UNLOADING

摘要

PURPOSE:To improve a loading and unloading efficiency by flexibly changing a carriage speed with a fast switching valve controlled by a detection signal of a front and rear distance confirming detection means provided on a travel carriage. CONSTITUTION:A high pressure pipe 103 extending from the first high pressure pump 101 reaches to a 4 ports 3 positions selector valve 106 for a forward- backward switching via an ever-open valve 104, thence connects with a variable displacement type hydraulic motor 18 reversely rotative and driving a drive wheel 19. The first branch pipe 110 connected with the pipe 103 via a nonreturn valve 107 connects with a life cylinder 23 via a 4 ports 3 positions selector valve 111 for casing up and down, and the second branch pipe 112 connects with a change-direction cylinder 63. A low pressure pipe 114 extended from the second low pressure pump 102 connects with the pipe 103 reached to the motor 18 at the upstream side of the valve 106 via an ever-closed valve 115 for fast switching and a nonreturn valve 116.