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本讲介绍伺服阀的结构和性能及使用寿命的关系。或者说是决定电液伺服静态特性(精度)的伺服阀的零漂及对零漂采取的措施等。关于伺服阀的结构,为了不使内容涉及的面太广,将围绕伺服阀中典型的两级伺服阀,并以采用喷咀—挡板机构为例进行叙述。一、伺服阀的结构1.伺服阀的基本组成如前章所述,伺服阀将输入电流转换为液压前置放大器中喷咀—挡板机构的挡板位移。从而产生喷咀背压差以驱动主滑阀。即是说,采用喷咀—挡板的两级伺服阀,可大体分为:将输入电流转换为挡板位移的电磁回路(力矩马达);因挡板位移而使喷咀产生背压差的喷咀—挡板机构以及控制高压液流的主滑阀三个部分。
This talk introduces the relationship between servo valve structure and performance and service life. Or to determine the electro-hydraulic servo static characteristics (accuracy) of the servo valve zero drift and zero drift measures taken. Regarding the structure of the servo valve, a typical two-stage servo valve in a servo valve will be described, taking the nozzle-baffle mechanism as an example, so as not to cover the surface too broadly. First, the structure of the servo valve 1. The basic composition of the servo valve As mentioned in the preceding chapter, the servo valve will input current into the hydraulic preamplifier nozzle - bezel mechanism baffle displacement. Resulting in nozzle back pressure to drive the main spool. That is to say, the use of nozzle - baffle two-stage servo valve can be broadly divided into: the input current is converted to the baffle displacement of the electromagnetic circuit (torque motor); nozzle displacement due to baffle nozzle back pressure Nozzle - baffle mechanism and the main valve to control the high-pressure liquid flow of three parts.