| 摘要 |
1. A positioning indication system for self-propelled hoisting machines, consisting of an electrical control system for the support reaction, comprising microswitches coupled with support reaction sensors and an alarm block, characterised in that it has two relays (P1, P2), whereas contacts (P11, P12) of those relays are connected in series with a branch of the alarm block power supply (D), and each relay has a coil connected in parallel with the power supply (A) by microswitches connected in series and respectively in pairs: the first with the third (H1, H3), and the second with the fourth (H2, H4), whereas coils branches of the relays (P1, P2) are short-circuited to each other by a switch (W), whereas the pairs of microswitches: the first with the third (H1, H3) and the second with the fourth (H2, H4) are coupled with respective pairs of pressure sensors located in the servomotors of the supports located on the chassis diagonals.<IMAGE>
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