| 摘要 |
<p>The safety device provides the setting up, at the input of the oil duct (1) of the telescopic cylinder (2) which forms the tipping apparatus of the body of the lorry, of an electrovalve (3). Said electrovalve (3) to be connected on line (4) with a relay (5) to be started, through electric lines (6 and 7), by pressure switches (8 and 9)excited through pneumatic lines (10 and 11) connected in parallel with the pneumatic lines of fast descent (12) and slow descent (13); both said pneumatic lines make part of the pneumatic system of the lorry. Said pneumatic lines of fast descent (12) and slow descent (13) drive an oleodynamic distributor (14) which through the duct (15) comes out of tank (16), draws up oil by means of the hydraulic pump (17) and lets it into the telescopic cylinder (2) through a duct (18). In case of a sudden pressure drop of oil occurs in duct (18), an instanteneous coming into operation of the electrovalve (3) will take place to prevent the downflow of oil from the telescopic cylinder (2). The down-stroke of the telescopic cylinder (2) is then allowed only when -through the setting in of the descent control, into the pneumatic lines of fast descent (12) of slow descent (13) a suitable pressure is generated such to excite the pressure switches (8 and 9). Said switches (8 and 9) activate the electrovalve (3) thus allowing the downflow of oil from duct (1) of the telescopic cylinder (2). <IMAGE></p> |
