PRESSURE RESPONDING TYPE TRACK TENSION ADJUSTING APPARATUS

摘要

The present invention comprises a flow wheel arm (9) for rotationally supporting the flow wheel (5) on which the track (3) of the tank is wound, and a hydraulic cylinder (11) connected to the lower end of the flow wheel arm (9). The solenoid valve 53 installed on the side of the hydraulic supply line 51 connected to P1, the check valve 54 provided between the solenoid valve 53 and the hydraulic cylinder 11, the check valve 54 and the hydraulic return Orbital tension control device (1) controlled by a hydraulic circuit (50) consisting of a solenoid valve (55) provided between the lines (52) and a relief valve (59) provided between the hydraulic cylinder (11) and the hydraulic return line (52). ), The hydraulic pressure of the accumulator 67 and the hydraulic cylinder 11 side connected between the hydraulic cylinder 11 and the check valve 54 to accumulate the high pressure hydraulic pressure supplied from the second hydraulic pressure source P2. The accumulator 67 and the hydraulic cylinder 1 by comparing the pilot working pressure supplied from the line 69 and the supply line 51. 1) by comparing the pilot pressure supplied from the hydraulic pilot switching valve 73 to open and close the hydraulic line 71 between the supply line 51 and the hydraulic line 77 side of the hydraulic cylinder 11, the hydraulic cylinder 11 Hydraulic pilot switching valve 78 for opening and closing the hydraulic line 77 between the side hydraulic line 71 and the return line 52, the hydraulic line 71 side connecting the accumulator 67 and the hydraulic cylinder 11 Solenoid valve 80 for opening and closing the pilot pressure line 81 connected to the hydraulic pilot switching valve 78 from the valve, the limit switch 82 for turning on the solenoid valve 80 at the reverse critical position of the flow wheel 5, the accumulator It relates to a pressure-sensitive orbital tension control device including a solenoid valve 83 for opening and closing the hydraulic line 71 between the 67 and the hydraulic pilot switching valve 73 in the hydraulic circuit 50.