1、毕 业 设 计（论 文）外 文 参 考 资 料 及 译 文译文题目： 弯管机结构设计 学生姓名： 学 号： 专 业： 所在学院： 指导教师： 职 称： 20xx年 2月 27日 The research and realization of the ultra-low and constant speed control technology about the cylinder for the large caliber pipe Bender Fang XiuRong, Yang DanFeng2l.Department of Mechanical Engineering Xian Uni
2、versity of Science and Technology, Xian,China. fangxrO 2.China National Heavy Machinery Research institute Co.,Ltd, Xian,China YDF711020 ydf711020Abstract-The ultra-low and constant speed control is one of the key techniques that the large caliber pipe bender can use to achieve bend automatic proces
3、s. This technology which could analyze the working requirements of the pipe benders heating, introduces the single-cylinder pulling and bending driving form and uses the hydraulic control technique to realize the stationary and reliability in the cylinders ultra-low speed motion. Additionally, it wi
4、ll prevent the phenomenon of vibration and arc ridging in the process of thin-wall pipes bending and assures a high quality of large bend caliber pipes with different bending radiuses and bending angles. At the same time, this technology could also be promoted and appliedin any hydraulic controlled
5、devices which need a stable and low-speeding operation. Keywords- large caliber pipe bender; ultra-low and constant speed; cylindeIntroductionI. INTRODUCTION As our countries oil flow and transportation of gas are being adjusted, the need for large caliber pipe bender is gradually increasing, for nu
6、merous large caliber pipes with flexible direction changing are demanded. Middle frequency heating hydraulic bending pipe is not only an important part of the pipeline, but a vital subject of large caliber pipes project. Its working principle is to heat steel pipes (including low alloy steel pipe an
7、d stainless steel pipe, ect.) by middle frequency power supply, while using the hydraulic cylinder to push tubes uniformly,so that heated steel pipes will walk along the preset tracks to form to be some bending pipes with certain radiuses and angles.(1) For therere many artificial factors, lots of d
8、omestic developing pipe benders have problems on quality control, especially in the field of pushing speed. Pushing and bending are even driven by hoister and wire rope, as a result, the pushing speed is unstable, which results in wrinkled surface, irregular geometry and poor ellipticity. Foreign mi
9、ddle frequency heating pipe benders can be divided into two categories: mechanical and hydraulic. The mechanical bender features huge structure, heavy weight, large occupying space and high cost. While, the hydraulic bender adopts dual hydraulic cylinders, in which the main pushing cylinder has a sm
10、aller bore, and cylinders low speed is quite easy tocontrol. But as both hydraulic and electric control systems have to control solve the synchronous problem,corresponding and costs will increase.(2)II. WORKING PRINCIPLE OF LARGE CALIBER MIDDLEFREQUENCY HEATING HYDRAULIC PIPE BENDER Large caliber mi
11、ddle frequency heating hydraulic pipe bender is a new type of automated processing equipment of bending pipe, which is driven by hydraulic system and pushed by single cylinder. This device can process bending pipe whose caliber range from 610 mm to 1524 mm into different radiuses and angles. The ben
12、der is consisted of five parts: host/ hydraulic system/ middle frequency heating/ cooling and electric control. To ensure a high quality of the bending pipe and safety of the system, the technology of pushing and bending of large caliber middle frequency heating hydraulic pipe bender becomes one of
13、the key technologies. The pushing bar technology of large caliber middle frequency heating hydraulic pipe bender adopts pipe bender single-cylinder driving form, avoiding the free running phenomenon which is brought by the double-cylinder. Furthermore, this technology which is better than other form
14、s ensures a simple/ compact structure, and provides a reliable/ stable and low-speeding operation.The type of bending and pushing pipes diagram is shown in the figure 1. The single hydraulic cylinder 1 pushes the mobile beam 2, the heated steel tube 3 and tumbler 8. At a fixed radius to makes the pi
15、pe formed, and the cylinder stroke could be inspected by rotary encoder.Scientific Research Program Funded by Shaanxi Provincial Education Commission （ Program NO. 2010JK661)1-cylinder;2-moblile beam;3-front figure;4-pipe blank 5-supporting roller;6-inductive coil;7-back figure;8-swivel arm;Figure 1.Diagram about bending pipe using pushing and bendin
