Research On The Rolling Friction Cylinder Hydraulic Standard Force Source Technique

The reference of force value national is a fixed power equipment of generating reference force values. It is used to calibration standard dynamometer mainly. In construction and mechanical engineering and other fields, we always encounter the practical problems of measuring the size of the force. So the measured force value is essential. In order to ensure consistency and accuracy of force measured and transfer, we must research the standard power source technology and establish a corresponding power value measurement apparatus test system. Hydraulic power source in which the standard value measured in the strong field is widely used, but the cylinder and piston friction and leakage between the measured force value it difficult to improve accuracy, efficiency, low cost is very expensive. To solve this problem, people tried to hydrodynamic lubrication, static pressure lubrication and other means, but the results are not satisfactory. This is the first for the current situation of the rolling friction precision hydraulic cylinder power source technology standards to address the existing hydraulic power source bottlenecks encountered.The main research work and results are summarized as follows:First, analyzing of the existing power base machine hydraulic characteristics, the basic working principle and the factors that caused the error:Hydraulic force standard machine is large and small fuel tanks as the main form of connectivity devices, according to Pascal principle of work. It is based on the principle of the dynamics force, known by the quality of weight to the gravitational amplification by the hydraulic force values reproduce the standard reference power source device. Improve the technical performance of its key problem is the friction cylinder plug and ring system clearance leakage. The study found that in order to reduce the friction between the plunger, it is always around the two moving parts to reduce friction sliding contact with the work done. Then, for the present situation, this paper proposes the first innovative sliding friction with rolling friction instead of the idea that the design of the structure of a cylinder rolling friction, sliding friction to replace the original fuel tank. Furthermore, this article on the structural design of tanks rolling friction was described in detail to the invention of the rolling friction piston hydraulic cylinder at the core, the use of two rolling friction piston hydraulic cylinder to form a connected device, constitute a hydraulic force standard machine subject. Same article also designed the hydraulic control system. It consists of two differential hydraulic cylinder piston connected to constitute a special make up the oil pump, together with the servo drive control system, hydraulic loop. In addition, this system uses a high pressure seal technology and non-frictionless piston cylinder automatic voltage pulse technology, the hydraulic force standard machine to improve the force measurement accuracy of the value of great help. Again this article also describes the rolling friction cylinder hydraulic force standard machine analysis of the uncertainty related to the principle of rolling friction is derived hydraulic force standard machine cylinder power between value and volume of each of the uncertainty relations. Eventually adopted the use of static analysis showed that the fuel tanks rolling friction may make errors in the 0.01% level of the machine. Hydraulic fluid through the structure coupling analysis of the structure can be seen that the introduction of new rolling friction hydraulic force standard machine in the prevention of leaks have very good results. The design of this article to a mechanical device and hydraulic control systems can be formed together with a complete electrical control system of rolling friction oil hydraulic force standard machine.In sum, rolling friction cylinder force standard machine is a new working device. It facilitate the structure of cylinder, decrease friction and costing substantially, It has no use for high-handed hydromantic device, and has not the phenomenon of pressure and flow impulse. totally meets domestic requirements for standard force source devices, and has a great important significance for the develop of measure working.