| 摘要 |
The invention relates to a hydraulic arrangement for the control of a lifting gear (12) of an agricultural machine (10). The hydraulic arrangement (16) comprises a hydraulic cylinder (24) having a chamber (50) to which pressure can be applied, a proportionally controlled inflow valve (22), which is connected on the outlet side via a inflow pipe (30) to the chamber and on the inlet side to a hydraulic pump (18, 18'), further comprising a first outflow pipe (32) which establishes a connection between the chamber (50) and a hydraulic tank (20), further comprising adjusting means (42, 44) for generating an adjusting signal for the hydraulic cylinder (24) and an electronic control unit (40). In order to create a control system having a simple and compact design, the invention also provides to dispose an electro-proportional pressure relief valve (26) in the first outflow pipe (32) and a check valve (28) that closes in the direction of the inflow valve (22) in the inflow pipe (32). Furthermore, the invention also provides for one or more sensors (36, 38), which are connected to the hydraulic cylinder (24) and produce a sensor signal, wherein the pressure relief valve (26) can be controlled and/or adjusted as a function of the one or more sensor signals and/or the adjusting signal. |
