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摘要：聚乙烯（PE）管道系统正在我国快速推广应用，并逐渐取代传统的金属管道。连接技术是PE管道技术系统中的关键技术。连接质量对PE管道的整体性能有很大的影响。热熔对焊机是PE管焊接最常用的一种户外连接设备。热熔焊接机的焊接过程复杂，焊接工艺参数多，焊接自动化的而要求非常的高。然而，目前国内工程上所使用的热熔焊接机的自动化均不高，多为半自动化系统，焊接过程中需要人为的干预。整个过程中有人为因素的影响，所以焊接的质量难以保证。因此实现热熔焊接的自动化意义非常重大。
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本文根据热熔焊接机的几种规格中的工作要求，设计兼容的小型液压动力单元。其中，内容包括液压原理图的设计，液压元件的选择，整体机械结构的设计等。根据热熔焊接机的焊接需求：最高工作压力10Mpa，泵排量4ml/r，整体为便携式结构。设计内容需包括：液压系统供两个同步液压缸（并联）无调速进退，及热板抬升动作。两种缸不同时动作。同步缸前进过程需要比例控制施压，压力控制范围0.4~10MPa，并可以保证长时间的保压效果。
由于焊接的质量十分的重要，所以在设计完成后，可以在焊接技术上进行进一步的讨论，例如，焊接施工方法，焊接的技术参数的设定方法，焊接质量的检测等。
关键字： PE管； 全自动； 热熔焊接机；液压系统；便携式3881
The design of hydraulic system of PE pipe hot melt automatic welding machine
Abstract :Today China is rapid popularize and applicants Polyethylene (PE) pipe system, and gradually replaces the traditional metal pipelines. Connection technology is the key technology in the pipeline system PE. Have a great influence on the quality of PE pipeline connected to the overall performance of the. Hot-melt welder on PE pipe welding an outdoor most commonly used connection device. Hot-melt welding machine, welding parameters, welding automation and requires very high. However, the current domestic engineering using hot melt welding machine automation is not high, for the semi - automation system, the need for human intervention in the welding process. The artificial factors in the whole process, so it is difficult to guarantee the quality of welding. Therefore, to realize the automation of hot melt welding is of great significance.
According to several specifications hot-melt welding machine's work requirement, small hydraulic power unit design compatible. Among them, including the design of the hydraulic principle diagram, the choice of hydraulic components, the whole mechanical structure design etc. According to the welding fusion and welding machine: 10Mpa maximum working pressure, pump capacity 4ml\/r, the portable structure. Design content includes: hydraulic system for two synchronous hydraulic cylinders (parallel) without speed of advance and retreat, and hot plate uplift movement. Two cylinders do not act at the same time. Synchronous cylinder forward process requires a proportional control pressure, pressure control range of 0.4~ 10MPa and can guarantee the long time of pressure maintaining effect.
Because the welding quality is very important, so in the design is completed, can be used for further discussion, in welding technology for example, welding method, welding technology parameter setting method, the welding quality detection.
Keyword: Polyethylene (PE) pipe；full-automation；Hot melt welding machine；hydraulic pressure system；Portable
目录
1 前言 1
1.1 课题介绍 1
1.2 国内外现状 1
1.3 现实意义 2
1.4 对课题的认识 3
1.5 课题主要研究工作 3
2 液压系统的设计 4
2.1 液压系统方案的确定 4
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