Results 11 to 20 of about 632 (122)

Design and research of hydraulic cylinder precise control test system [PDF]

open access: yes, 2023
The position deviation after the continuous action of the hydraulic support in the fully-mechanized mining face affects the mining efficiency of the shearer.
Lingyu MENG, Rulin ZHOU, Zijian GUO
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Mechanism evolution mechanism of active support process of two-leg shield [PDF]

open access: yes, 2023
In view of the unclear mechanism evolution of the two-leg shield during the active support process, the planar kinematic model of two-leg shield is established, the necessary conditions for the mechanism evolution of the shield are obtained, and the ...
Xiangpeng HU, Xinhua LIU
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The Hydraulic Cylinder with Extensive Position Controlled Piston Rod [PDF]

open access: yes, 2012
该文介绍了一种活塞杆伸出量可测并可控的液压缸。该缸利用滚珠丝杆将活塞杆的直线位移转化为丝杆角位移的方法进行位置测量,其结果由光栅编码器输出并传送到控制中心,由控制中心控制伺服阀的阀口方向和开口大小,从而对液压缸活塞杆产生控制作用。本文对其原理进行了阐述,并对可能存在的测量误差进行了分析。This paper introduces a hydraulic cylinder that its piston rod extension can be effectively controlled,linear ...
吴榕   +5 more
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ZY760活塞杆头部模锻成型工艺研究 [PDF]

open access: yes, 2009
ZY760活塞杆头部在实际胎模成型试制时出现头部两凸台不能充满现象,通过采用ANSYS软件对实际成型过程进行仿真模拟,发现导致胎模锻不能成型的主要原因是模腔的左端是自由面,大量材料沿轴向无约束端流动,而向上、下凸台流动的材料很少,把自由端增加约束并进行有限元模拟,证明上、下凸台能够成型,生产中改用在50 kN模锻锤开式模锻 ...
轩军厂, 郭侠
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Critical Load and Optimum Design for Hydraulic Cylinders [PDF]

open access: yes, 2011
针对液压缸活塞杆与缸体由于受轴力和横向力的共同作用而产生弯曲变形导致液压缸整体失稳的问题,分别对活塞杆和缸体建立挠曲性微分方程,确定活塞杆与缸体间隙处最大挠度,再建立关于挠度的非线性方程组,获得计算液压缸临界载荷的超越方程。结合参数化有限元优化设计技术,获取体积约束条件下液压缸的合理尺寸,通过与rITz法计算结果比对和实验验证可知,该算法能够较好地优化液压缸结构参数,满足工程实际应用需要。The gap between piston rod and cylinder is an important ...
林荣川, 林辉, 郭隐彪, 魏莎莎
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The study on the Hydraulic Cylinder That The Out of The Piston Rod Can Be Controlled [PDF]

open access: yes, 2012
随着现代生产向着高效、精准、绿色环保等方向的发展,一种活塞杆伸出量可测并在此基础上对其进行有效控制的液压缸在众多领域得到利用。如轧钢流水线上的轧辊间隙控制装置、注塑机械的注塑推进机构、高速跑车的尾翼仰角控制装置、煤炭机械中的液压支柱、冶金厂锅炉的物料推送机构等等。上述装置中有些油缸的运动精度需要达到的级别,当然高精度的运动必须有高精密的传感器作为依托,众所周知,世界上高精密的关键技术大部分还掌握在欧美一些发达国家手中,带位置测量的液压缸也不例外。为此本文提出了一种测量方案 ...
唐雯
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The Stability of Hydraulic Cylinder and Optimization Based on State Vector Matrix Transfer [PDF]

open access: yes, 2011
液压缸由直径不同的缸体和活塞杆构成,工程上可视为承受轴向压缩的阶梯细长压杆,须进行稳定性校核.把液压缸的每段结构视作一个受压单元,受压单元中的弯矩和剪力都分别表示二维状态向量的单元矩阵,通过各单元传递矩阵相乘,获得受压状态活塞杆两端的状态向量关系,根据液压缸两端约束条件,推导液压缸稳定性普遍方程.结合MATlAb参数优化技术,获取体积约束条件下液压缸的最优尺寸,通过和rITz法计算结果、模型实验实测值比对,表明该计算结果更接近准确值.The hydraulic cylinder is composed ...
文波, 林荣川, 郭隐彪
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Sealing Failure Analysis of Hydraulic Cylinder's Rod and Preventive Measures [PDF]

open access: yes, 2007
针对液压传动密封失效的现象,分析了液压系统中活塞杆密封失效的形式、特点,并提出解决此种密封失效的方法。Aiming at the failure of hydraulic sealing,This paper analysis the features of the piston-rod seal failure in hydraulic system, It also put some methods to solve such a seal ...
吴榕, 邹建华
core  

The Development and Application of a New Multi-position Cylinder [PDF]

open access: yes, 2004
【中文文摘】本文介绍了串联式多位气缸、数字步进气缸的结构特点和工作原理 ,指出存在的缺点。并介绍了一种新型的多位气缸的设计、工作原理和结构特点。 【英文文摘】The structure features and work principles of the multi-position series cylinder and the digital step-cylinder were introduced.
吴碧金, 胡国清
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Mechanical Analysis and Simulationin about Ball Screw in Extended Controllable Hydraulic Cylinders [PDF]

open access: yes, 2013
该文介绍了一种活塞杆伸出量可控的液压缸,该缸利用滚珠丝杆副将活塞杆的直线位移转化为丝杆的角位移,再由旋转编码器对该角位移进行测量,经过反推计算可得到活塞杆伸出量的大小,为保证测量的准确性和控制的精确性,需要对测量的误差进行补偿。该文在PrO/E中建立了丝杆的实体模型,并导入到AnSyS中,通过热-结构耦合分析得到某一温度下丝杆的伸长量,再经过对数据的分析以及线性化,可作为控制程序中误差补偿的参考数据来应用。This paper introduces a kind of hydraulic ...
侯恩光, 吴榕, 陈燕君
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