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Research on the Rolling Friction Cylinder Hydraulic Standard Force Source Technique

Author: DuanWen
Tutor: ZhangXueCheng
School: Jilin University
Course: Mechanical Manufacturing and Automation
Keywords: Standard power source Force value test Rolling friction Cylinder Hydraulic force standard machine
CLC: TH823
Type: Master's thesis
Year: 2011
Downloads: 72
Quote: 1
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Abstract


National reference force value is a method for generating a reference force value of fixed equipment, mainly used for fixed degree standard dynamometer. In the country's scientific and industrial production and other areas often encounter measure the size of the actual force value problem, so force value measured is essential. In order to ensure value measurement and transmission of force consistency and accuracy, must examine the standard power source technology. Standard hydraulic power source which vigorously value measurement is widely used in the field, but the friction between the cylinder and the piston force values ??and leakage measurement accuracy it difficult to improve work efficiency is low, the cost is very expensive. To solve this problem, people tried hydrodynamic lubrication, hydrostatic lubrication and other means, but the results are not satisfactory. This is the first view of the current situation of the precision hydraulic cylinders rolling friction force source technology to solve the existing standard hydraulic power source bottlenecks encountered. The main work and innovations are summarized as follows: First, the existing standard hydraulic power source of the basic principles of its error factors analyzed in detail: the hydraulic force standard machines to large and small cylinder as the main form of communicating vessels, According to Pascal's principle work, which is based on the force dynamics effect of the known mass weight of gravity by hydraulic force amplification to reproduce the reference value. Improve technical performance affecting its key problem is the cylinder plug system friction and annular gap leakage. The study found that in order to reduce the friction between the plunger, people around the two moving parts to reduce friction and make sliding contact with the work. Then for the current situation, this paper presents the first innovative rolling friction instead of sliding friction with the idea that design a rolling friction cylinder structure to replace the original sliding friction cylinder. Secondly this paper, the structural design of rolling friction cylinders were elaborated to present rolling friction piston hydraulic cylinder as the core, the use of two rolling friction piston hydraulic cylinder to form a connected device, constitutes a hydraulic force standard machine subject. Same article also designed the hydraulic control system. It consists of two differentially connected dedicated hydraulic cylinder piston pump up the oil, together with the servo drive control system, the hydraulic circuit components. In addition, this system uses a high pressure seal technology and frictionless piston cylinder automatic voltage pulsation technology, to improve the hydraulic force standard machine value of the force measurement accuracy is very helpful. This article discusses again rolling friction cylinder hydraulic force standard machine Uncertainty analysis of the relevant principles deduced rolling friction cylinder hydraulic force standard machine force value and the impact of various relationships between the amount of uncertainty. Ultimately through the use of static analysis shows that the rolling friction cylinder may produce errors in the 0.01% level of the machine. Through the hydraulic cylinder coupled fluid-structure analysis can be seen using the new structure of the rolling friction hydraulic force standard machine to prevent the disclosure has a good effect. The article is designed mechanical and hydraulic control systems with electromechanical control system can form a complete rolling friction cylinder hydraulic force standard machine. In short, the rolling friction cylinder hydraulic force standard machine is a new standard power source device. It simplifies the cylinder structure, significantly reduces friction and cost, high efficiency, no high-pressure pump, there is no pressure and flow pulsation phenomena. Fully able to meet the country's industrial production to the standard power source device needs to work on the development of measurement has important significance.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Mechanical quantity measuring instruments > Force measuring instruments
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