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1. 发明公开

EP3864954A1 HYDRAULIC CONTROL CIRCUIT FOR AN OPERATING MACHINE AND OPERATING MACHINE 有权
公开(公告)号：EP3864954A1
公开(公告)日：2021-08-18
申请号：EP21152543.1
申请日：2021-01-20
申请人： Negri Srl
发明人： NEGRI, Marco
IPC分类号： A01F29/00 , A01F29/01 , A01G3/00 , B27L7/00
摘要： A control circuit (20) for an operating machine, wherein the operating machine is equipped with a cutting member (11) motorised by a propulsion group (M) and with a conveying member (14), wherein the control circuit (20) comprises:
- a hydraulic pump (21) actuated by the propulsion group (M);
- a hydraulic motor (I) configured to actuate the conveying member (14), wherein the hydraulic motor (I) is arranged on a delivery branch (211) of a hydraulic fluid slaved to the hydraulic pump (21);
- a first safety valve (30) configured to selectively open and close a first by-pass branch (22) branching from a first branching node (221) arranged on the delivery branch (211) upstream of the hydraulic motor (I) and flowing together with a first confluence node (222) arranged on a return branch (212) of the hydraulic fluid downstream of the hydraulic motor (I);
- a second safety valve (35) configured to intercept a second by-pass branch (23) branching from a second branching node (231) arranged on the delivery branch (211) upstream of the hydraulic motor (I) and downstream of the first branching node (221) and flowing together in the return branch (212), wherein the second safety valve (35) can be selectively operated between two operative positions, one being a first operative position in which it closes the second by-pass branch (23) and the other being a second operative position in which it opens the second by-pass branch (23);
characterised in that the second safety valve (35) is configured to pass from the first operative position to the second operative position automatically when at least one of the following conditions has occurred:
a) the first safety valve (30) opens the first by-pass branch (22); and
b) the hydraulic pump (21) is inactive.

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