| 摘要 |
<p>PROBLEM TO BE SOLVED: To protect any angling cylinder, upon the occurrence of an overload thereon, regarding a construction vehicle equipped with an angling plough having a plurality of angling cylinders. SOLUTION: A work control valve 20 is formed out of a standard work valve part 23 and an attachment valve part 25. Also, the attachment valve part 25 is fitted with one attachment operation valve 24, and overload relief valves 35 and 36 for attachment operation pipelines 37 and 38. Actuator operation pipelines 41 to 44 branched from the attachment operation pipelines 37 and 38 are connected to each of angling cylinders 12 and 13 via solenoid valves 39 and 40. In addition, the actuator operation pipelines 41 to 44 are fitted with pressure switches 45 to 48, so as to detect an overload acting on the angling cylinders 12 and 13 for selecting the solenoid valves 39 and 40 and communicating the attachment operation pipelines 37 and 38 to the actuator operation pipelines 41 to 44.</p> |
