机械专业毕业设计论文液压疏煤系统设计方案.doc

摘 要 本毕业设计的课题来源于，主要任务是本文关键词：；；Abstract The design of the graduate engineering topics from the scene, the main task is to research internship at the scene on the basis of drawing up the dredging of coal system design, design a hydraulic system, electronic control systems and components and hydraulic choice components and electronic control components, the final completion of the entire system design. In this paper, the design of the hydraulic dredging coal system, including the two main parts: the hydraulic system and electronic control system. Which is part of the hydraulic control system of hydraulic telescopic eight hydraulic cylinders, hydraulic cylinders buried in the coal driven in a few words stick movement, leading to the reduced coal bunker coal. Electronic parts used PLC control: on the hoist motor, heater switch, the change to the electromagnetic valve, the hydraulic system of unloading, and so achieve the manual and automatic control. In this paper, the design of the hydraulic cylinders and electric control system of this design is part of the topic. In this paper, the design of a hydraulic cylinder piston-cylinder - link transmission programmer; Detroit Pistons used modular; front cover for the flange connection; cover after a welded structure; Pistons and the fixed link with nuts. The design of the cylinder, piston rod, cover, and other important parts of the structure and mechanical calculations. In this paper, the design of the electric control system, using todays more advanced PLC programmable logic controller as the main control devices, pressure relay as a PLC input. This system can transform the hydraulic oil-hydraulic cylinders to control the expansion, not only to achieve the independence of each cylinder can be automatically continuous operation, but also to achieve every two hydraulic cylinder automatic and manual control of continuous operation. In addition, the system in all types of hydraulic components and electronic control components