& 

液压技术轻量化与智能化发展的一些探索

杨华勇，邹俊

Some Exploration of Lightweight and Intelligent Development for Hydraulic Technology

YANG Hua-yong, ZOU Jun

（浙江大学 流体动力与机电系统国家重点实验室，浙江 杭州310027）

摘要：经过多年的发展，我国高端液压元件已经取得了一定的突破，恒立、林德与力源等国内液压企业设计制造的高压液压柱塞泵/马达、多路阀等已经在三一重机、徐工重机等主流的机型上得到批量应用。我国液压工业在努力实现更多并跑的同时，也应当寻求新技术的突破，实现局部引领。而当前不断发展的制造技术、感知技术和网络技术等为液压技术发展带来了新的机遇。该文主要对液压技术未来发展进行展望，简要介绍了液压系统与元件的轻量化、小型化、集成化、网络化以及智能化的未来趋势。

关键词：液压技术；先进制造；网络化；智能化

中图分类号：TH137文献标志码：B文章编号：1008-0813（2021）01-0001-03

探索我国气动产业“十四五”发展的路径

王雄耀

Exploring the Development Path of China's Pneumatic Industry

During the 14th Five Year Plan Period

WANG Xiong-yao

摘要：该文主题是探索气动行业战略发展、技术路线，在总结十三五规划的基础上，对十四五进行战略规划、技术路线探讨。

关键词：气动产业；十三五规划；十四五规划；新四化

中图分类号：TH137文献标志码：B文章编号：1008-0813（2021）01-0004-06

第25届亚洲国际动力传动与控制展览会

(PTC ASIA 2020)技术评述

中国液压气动密封件工业协会专家委员会

Technology Review of PTC ASIA 2020 China Hydraulics Pneumatics & Seals Association

(西城区太平街甲2号, 北京100050)

摘要：该文汇总了液压、气动、密封行业有关专家在第25届亚洲国际动力传动与控制展览会期间，从各自专业角度的所见所闻、体会感受和对行业发展的建议。

关键词：流体传动与控制；展览会；技术评述；液压；气动；密封件

中图分类号：TH137；TH138；TB42文献标志码：B文章编号：1008-0813（2021）01-0010-09

伺服阀滑阀偶件研磨研究

路超¹，高殿荣²，杨磊¹，袁明锋¹，李通¹

Study on Grinding of Servo Valve Slide Valve Coupling

LU Chao¹，GAO Dian-rong2, YANG Lei¹，YUAN Ming-feng¹, LI Tong¹

（1.河南航天工业总公司，河南 郑州451191; 2.燕山大学， 河北 秦皇岛066004）

摘要：该文针对2D阀出现的卡滞和泄漏量大这两个亟待解决的问题，从力学、热力学、泄漏量角度分析阀芯阀套间隙，而后针对阀套加工过程中的内孔加工，着重研究阀套关键工序研磨，从工装制作、加工、测量角度入手，把控阀套内孔形位公差，从而得到一致性好、配合质量高的产品。

关键词：卡滞；泄漏量；研磨；研究

中图分类号：TH137文献标志码：B文章编号：1008-0813（2021）01-0018-06

海上风机高压回转接头设计与研究

赵乐¹，索双富¹，李高盛²，卢华兴²

（1.清华大学机械工程学院，北京100084；

2.国家电投集团科学技术研究院，北京102200）

摘要：液压传动技术在风力发电中具有十分广阔的应用前景，特别是海上大型风机借助回转接头特殊的结构和功能可实现新的动力传递方式。针对海上风机需求特点和使用条件，采用新型组合密封设计回转接头的密封结构，并综合现有回转接头的技术优势对结构进行优化设计。经试验测试运行，回转接头工作可靠，性能稳定，较好地满足了海上风机液压系统的试验要求，对于提升回转接头性能和拓展其应用范围具有重要意义。

关键词：回转接头；组合密封；海上风机；设计与研究

中图分类号：TH137;TB42文献标志码：A文章编号：1008-0813（2021）01-0024-04

R & D of High Pressure Rotary Joint for Offshore Wind Turbine

ZHAO Le¹, SUO Shuang-fu¹, LI Gao-sheng², LU Hua-xing²

(1. Tsinghua University, School of Mechanical Engineering, Beijing100084, China；

2. State Power Investment Corporation Limited, Institute of Science and Technology, Beijing102200, China）

Abstract:Hydraulic transmission technology has a very broad application prospect in wind power generation. Especially in large offshore wind turbines, with the special structure and function of the rotary joint, the wind turbine can realize a new power transmission mode. In view of the conditions and characteristics of offshore wind turbines, adopting new combined seal design to seal structure of rotary joint, and optimize the structure by integrating the technical advantages of existing rotary joints. After test operation, the rotary joint works reliably and has stable performance, which satisfies the test requirements of the hydraulic system of offshore wind turbines. It is of great significance to improve the performance of the rotary joint and expand its application range.

Key words: rotary joint; combined seal; offshore wind turbine; R & D

基于Fluent滑动网格对非全周开口滑阀阀口

空化现象的研究

李森林^1,2，杨胜清^1,2,3，陈乾鹏^1,2

（1.兰州理工大学能源与动力工程学院, 甘肃兰州730050；

2.兰州理工大学甘肃省液压气动工程技术研究中心，甘肃兰州730050；

3.广西柳工机械股份有限公司，广西柳州545007）

摘要：该文主要研究了湍流方程黏度修正函数、流体湍动能、油液流动方向、阀口开启行为对于阀口空化现象的影响以及空化现象对于阀口输出质量流量的影响。该文以滑阀非全周阀口中的K型阀口为研究对象，利用Fluent滑移网格模型、Zwart空化模型和黏度修正函数、湍动能修正函数展开该文的研究。研究结果表明：湍流方程黏度项修正后，阀口近壁面处出现了速度更大、范围更广的回射流，进而改变空泡形状；考虑湍动能在空化现象的影响后，计算域内的空化量会增加；油液流动方向不仅会影响阀口空化的形态，空化发生的位置也会影响阀口输出的质量流量大小；当空化发生在节流槽内部时，空化气体会堵塞阀口降低阀口的有效过流面积，进而影响阀口的输出流量；阀口开度的变化会影响空化发生的位置数量以及强度；由于气液两相的密度差异，空化的不稳定性会影响阀口输出流量的不稳定性。

关键词：黏度修正函数；空化；非全周阀口；阀口流量

中图分类号：TH137文献标志码：A文章编号：1008-0813（2021）01-0028-07

Research on Cavitation Phenomenon of Non-full-circumference

Opening Spool Valve Port Based on Fluent Sliding Grid

LI Sen-lin ^1,2, YANG Sheng-qing^1,2,3, CHEN Qian-peng^1,2

（1. College of Energy and Power Engineering， Lanzhou University of Technology， Lanzhou730050, China;

2. Gansu Province Research Center of Hydraulics and Pneumatics Engineering Technology, Lanzhou730050, China;

3. Guangxi Liugong Machinery Co., Ltd., Liuzhou545007, China）

Abstract:This paper mainly studies the influence of viscosity correction function of turbulence equation, turbulent kinetic energy of fluid, flow direction of oil, opening behavior of valve port on cavitation phenomenon of valve port and the influence of cavitation phenomenon on output mass flow of valve port. In this paper, the K-type valve port in the non-full circumference valve port of slide valve is taken as the research object, and Fluent sliding mesh model, Zwart cavitation model, viscosity correction function and turbulent kinetic energy correction function are used to carry out this research. The results show that after the viscosity term of the turbulence equation is corrected, a jet with larger velocity and wider range appears near the valve port wall, thus changing the shape of the cavitation bubble. Considering the influence of turbulent kinetic energy on cavitation phenomenon, the amount of cavitation in the computational domain will increase. The direction of oil flow will not only affect the cavitation pattern of the valve port, but also the position where cavitation occurs will affect the mass flow output by the valve port. When cavitation occurs inside the throttling groove, cavitation gas will block the valve port and reduce the effective flow area of the valve port, thus affecting the output flow rate of the valve port. The change of valve port opening will affect the number and intensity of cavitation positions. Due to the density difference between gas and liquid phases, the instability of cavitation will affect the instability of valve port output flow.

Key words:viscosity correction function; cavitation; non-full circumference valve port;  valve port flow

ZL111和ZL104在干摩擦和油润滑下的摩擦

磨损行为研究

王婷婷¹，刘佳阳¹，王慧明¹，李应举²，吕晓仁¹

（1.沈阳工业大学，辽宁 沈阳110870； 2.中国科学院金属研究所，辽宁 沈阳110016）

摘要：采用往复式摩擦磨损试验机测试ZL111、ZL104干摩擦及油润滑摩擦性能，研究往复频率和添加剂二辛基二硫代磷酸锌（ZDDP）含量对ZL111、ZL104摩擦学性能的影响，探讨铝合金的摩擦学机理。结果表明：干摩擦下，在低频时ZL111的磨损量小于ZL104。ZL111在大于4 Hz时磨损量随频率增加而加大，而ZL104在大于8 Hz时才增加。基础油润滑下，铝合金在68#机械油润滑下的磨损量高于10W-30全合成油，ZL111的磨损量低于ZL104。在基础油中添加添加剂后，使得铝合金的磨损量降低。ZL111在含ZDDP的油润滑下的磨损量较小，其原因是Cu元素能够加强ZL111分子间的结合力，使化学反应膜更紧密的结合在基体表面。

关键词：铝合金;摩擦磨损;摩擦学机制;添加剂

中图分类号：TH137,TH142.2文献标志码：A文章编号：1008-0813（2021）01-0035-05

Friction Behavior of ZL104 and ZL111 under Dry Friction and Oil Lubrication

WANG Ting-ting¹， LIU Jia-yang¹， WANG Hui-ming¹， LI Ying-ju²， LV Xiao-ren¹

（1. Shenyang University of Technology, Shenyang110870, China;

2. Institute of Metal Research, Chinese Academy of Science, Shenyang110016, China）

Abstract: The dry and oil lubrication friction properties of ZL104 and ZL111 were investigated with reciprocating tribotester. The effect of reciprocating frequency and zinc dioctyldithiophosphate (ZDDP) content on the tribological properties of ZL104 and ZL111 was studied. The tribological mechanism of aluminum alloy lubricated by additives was discussed. The results showed that the wear loss of ZL111 was less than that of ZL104 at low frequency in dry friction. The wear loss of ZL111 increased with reciprocating frequency when it was faster than 4Hz, while the variety frequency of ZL104 was 8Hz. The wear loss of aluminum alloy lubricated in 68 # mechanical oil was higher than that in 10W-30 oil. The wear loss of ZL111 was lower than ZL104 in oil lubrication friction. Aluminum alloy wear loss was reduced when ZDDP used as the lubricant additive. The reason for the less wear loss of ZL111 in the lubrication of ZDDP oil was that Cu element can strengthen the binding force between ZL111 molecules and make the chemical reaction film more closely bonded to the substrate surface.

Key words: aluminum alloy; friction and wear; tribological mechanism; lubricant additive

高速高压及颗粒介质密封的探索

彭洪，贾红云，佘跃刚，张宝君

Study on the Performance of High Speed Mechanical Seal Used for

High Pressure Particle Medium

PENG Hong, JIA Hong-yun, SHE Yue-gang, ZHANG Bao-jun

（中密控股股份有限公司，四川成都610045）

摘要：高压溶剂进料泵是PTA装置的关键设备之一，机械密封作为高压溶剂进料泵的核心部件，能否长周期稳定运行直接影响该装置的经济效益，而目前该密封的使用寿命普遍较短，通过对PTA装置高压溶解进料泵机械密封使用寿命较短的原因进行分析，该密封的设计难点在于高压、高转速、介质中含较多固体颗粒且介质具有一定的腐蚀性，拟针对密封摩擦副端面，密封结构，冲洗方案提出了相应的改进措施，以延长密封使用寿命，确保装置安全稳定长周期运行。

关键词：溶解进料泵；高速；高压；机械密封；液体增强型密封；摩擦副

中图分类号：TB42文献标志码：B文章编号：1008-0813（2021）01-0039-04

压路机多功能振动阀的研究

冯立波¹，刘淑强¹，马承钊¹，王伟²

（1.山东临工工程机械有限公司技术中心，山东 临沂276023；

2.镇江华瑞液压机械有限公司，江苏 镇江212143）

摘要：提出一种压路机定量振动液压系统中多功能振动阀的设计方案，详细阐述了该阀的设计组成及工作原理，基于某型号压路机总体性能要求，最终确定其结构组成，解决现有常见振动阀故障率高、冲击大、不能校准振动频率等问题。为压路机振动液压系统设计提供设计参考。

关键词：压路机；振动液压系统；振动阀；测试分析

中图分类号：TH137.52文献标志码：A文章编号：1008-0813（2021）01-0042-04

Study on Multi-function Vibation Valve for Roller

FENG Li-bo¹, LIU Shu-qiang¹, MA Cheng-zhao¹, WANG Wei²

(1. Shandong Lingong Construction Machinery Co., Ltd., Technical Center, Linyi276023, China;

2. Huarui Hydraulic Machinery Co., Ltd.,  Zhenjiang212143, China)

Abstract: Putforward a kind of quantitative vibration road roller of multi-functional vibration valve in hydraulic system design, in detail elaborated the composition and working principle of the valve design is based on a type roller overall performance requirements, ultimately determine its structure, solve the existing high failure rate, big impact, not the calibration problem such as vibration frequency of common vibration valve. To provide reference for the design of vibration hydraulic system for roller designed.

Key words: roller；vibrating hydraulic system； vibration valve； test and analysis

俯仰油缸系统在散货堆场设备上的设计及应用

罗锦平，肖博涛

（上海振华重工（集团）股份有限公司，上海200125）

摘要：随着经济的快速发展，煤炭、铁矿石等散货物料的贸易量迅猛上升。为了提高运力，散货物料运输船的吨位越来越大，相应的散货堆场设备的额定作业能力也越来越强。由于俯仰油缸系统具有功率体积比大、机构调速能力强以及故障率低等优点，该系统已在散货堆场设备上得到广泛应用。

关键词：俯仰油缸系统；散货堆场设备；设计；应用

中图分类号：TH137文献标志码：A文章编号：1008-0813（2021）01-0046-03

Design and Application of Boom Luffing Cylinder System for Bulk Yard Equipment

LUO Jin-ping, XIAO Bo-tao

(Shanghai Zhenhua Heavy Industries Company Limited, Shanghai200125, China)

Abstract: With the rapid development of economy, the trade volume of coal, iron ore and other bulk materials is increasing rapidly. In order to improve the transportation capacity, the tonnage of bulk material carrier is getting larger and larger, and the rated operation capacity of corresponding bulk storage yard equipment is getting stronger and stronger. Due to the advantages of big power volume ratio, strong speed regulation ability and low failure rate, the system has been widely used in bulk yard equipment.

Key words: boom luffing cylinder system; bulk yard equipment; design; application

结晶器在线调宽液压伺服系统仿真分析与试验研究

郭佳¹， 丘铭军¹， 龚亮²， 叶远芹³， 陈国防¹， 王训安¹

（1.中国重型机械研究院股份公司西安市重型机械高端液压技术与装备工程技术研究中心，陕西 西安710032；

2.涟源钢铁集团有限公司210转炉厂，湖南 娄底417009；

3.庆安电气控制有限责任公司，陕西 西安710077）

摘要： 该文对板坯连铸机结晶器在线调宽工况下结晶器窄面夹紧装置进行了受力分析；介绍了结晶器在线调宽液压伺服系统原理，同时运用MATLAB/Simulink平台搭建了实际工况下的液压伺服系统模型，仿真结果显示结晶器在调宽工况下液压缸响应速度满足要求且液压缸跟随性良好；同时给出了现场调试过程中结晶器单侧窄面上下调宽液压缸位移关系，对后续研究结晶器在线调宽液压伺服系统具有重要指导意义。

关键词：板坯结晶器；在线热调宽；液压伺服系统；试验

中图分类号：TH137；TF777文献标志码：A文章编号：1008-0813（2021）01-0048-05

Simulation Analysis and Experiment of Hydraulic Servo System for On-line Width Adjustment

GUO Jia¹, QIU Ming-jun¹, GONG Liang², YE Yuan-qin³, CHEN Guo-fang¹, WANG Xun-an¹

（1. China National Heavy Machinery Research Institute Co., Ltd., Xi'an Heavy Machinery High-end Hydraulic

Technology and Equipment Engineering Technology Research Center，Xi'an710032， China;

2. Lianyuan Iron ＆ Steel Group Co.， Ltd.， Loudi417009，China;

3. Xi'an Qing'an Electric Control Co., Ltd.， Xi'an710077，China)

Abstract: In this paper, the stress analysis of the mold narrow surface clamping device under the condition of mold online width adjustment of slab caster is carried out; the principle of mold online width adjustment hydraulic servo system is introduced; at the same time, the hydraulic servo system model under actual working condition is built by using MATLAB/Simulink platform. The simulation results show that the response speed of the cylinder piston meets the requirements and the cylinder follow-up performance is satisfied Good; at the same time, give the displacement relationship of the cylinder on one side of the mold narrow surface in the process of field debugging, which has guiding significance for the follow-up research of mold on-line width adjustment servo system.

Key words: slab mold; on-line thermal width adjustment; hydraulic servo system; experiment

活塞驱动往复式壅塞空化器的设计及仿真分析

王勇¹,陈谷¹，杨首谋²

（1.湖南工业大学 机械工程学院，湖南 株洲412007；

2.合肥华升泵阀股份有限公司，安徽 合肥231100）

摘要：为寻求一种解决大规模工业水处理问题的新型空化器，该文作者设计和研制了一套活塞驱动往复式壅塞空化器。基于pro/e设计了空化器内部结构及运动仿真，利用Fluent软件计算了在不同背压下活塞驱动往复式壅塞空化器内部流场变化规律。计算和仿真结果表明：活塞缸内径为150 mm、喷嘴直径为3 mm、曲柄长为60 mm、连杆长为480 mm、曲柄转速为60 r/min时，新型空化器能够产生有效空化，背压同步控制阀能够有效控制背压，且最佳背压为0.2 MPa。

关键词：活塞驱动往复式；壅塞空化；仿真；背压

中图分类号：TH137文献标志码：A文章编号：1008-0813（2021）01-0053-08

Design and Simulation Analysis of Piston Driven Reciprocating

Choking Cavitation Device

WANG Yong¹, CHEN Gu¹,YANG Shou-mou²

（1. School of Mechanical Engineering, Hunan University of Technology, Zhuzhou 412007, China；2. Hefei Huasheng Pumps & Valves Co., Ltd., Hefei231100, China）

Abstract: In order to find a new type of cavitation device to solve the problem of large-scale industrial water treatment, the author designed and developed a set of piston driven reciprocating choking cavitation device. Based on Pro/E, the internal structure and motion simulation of the cavitator are designed, and the flow field of the piston driven reciprocating jam cavitator under different back pressures is calculated by CFD software. The results of calculation and simulation show that the inner diameter of piston cylinder is 150 mm, the diameter of nozzle is 3 mm, the length of crank is 60 mm, the length of connecting rod is 480 mm, and the speed of crank is 60 R/min. The new cavitation device can produce effective cavitation, the back pressure synchronous control valve can effectively control the back pressure, and the best back pressure is 0.2 MPa.

Key words: piston drive reciprocating; choking cavitation; simulation; back pressure 

低温对恒压式变量柱塞泵开启压力影响的仿真分析

马吉光¹，于大伟²，刘雨¹，杨华¹

（1.中航力源液压股份有限公司，贵州 贵阳550018；

2.空装成都局驻贵阳第三军事代表室，贵州 贵阳550018）

摘要： 针对恒压式变量柱塞泵在低温工况下恒压阀开启压力偏高的问题，通过AMESim和Flunet软件进行仿真分析，得出了油液温度和控制阀油道是引起恒压阀开启压力偏高的主要原因，最后，通过试验验证了相关结论的正确性。

关键词：恒压式变量柱塞泵；低温；AMESim；Fluent

中图分类号：TH137文献标志码：A 文章编号：1008-0813（2021）01-0060-04

Simulation Analysis of the Influence of Low Temperature on the Constant

Pressure Variable Piston Pump Opening Pressure

MA Ji-guang¹, YU Da-wei², LIU Yu¹, YANG Hua¹

（1. AVIC Liyuan Hydraulic Co., Ltd., Guiyang550018, China;

2. Quality Representative, Guiyang550018, China）

Abstract: In view of the problem that the opening pressure of constant pressure valve of constant pressure variable piston pump is too high under the low temperature working condition, through the simulation analysis of AMESim and Flunet software, it is concluded that the oil temperature and control valve passage are the main reasons for the high opening pressure of constant pressure valve. Finally, the correctness of the relevant conclusions is verified by the test.

Key words: constant pressure variable plunger pump; low temperature; AMESim; Fluent

液力变矩器叶片滚铆机的液压系统总体设计

潘文宏

（陕西国防工业职业技术学院智能制造学院，陕西西安710300）

摘要：为解决液力变矩器叶片滚铆机的主轴单元进给和自动上下料动作要求，该文以冲焊型液力变矩器涡轮外环叶片固定滚铆机为研究对象，主要就滚铆机液压系统进行总体设计以及液压辅助装置进行设计研究。通过对滚铆机液压系统总体的设计与研究，从而大大提高液力变矩器的制造效率。

关键词：液力变矩器；滚铆机；液压系统；液压辅助装置

中图分类号：TH137;TG502;TH69文献标志码：A文章编号：1008-0813（2021）01-0064-04

Overall Design of Hydraulic System for Torque Converter Blades Fixed

Rolling Riveting Machine

PAN Wen-hong

（School of Intelligent Manufacturing， Shaanxi Institute of Technology, Xi'an710300, China）

Abstract: In order to solve the requirements of the spindle unit feeding and automatic loading and unloading of the torque converter blade rolling riveting machine,the punching and welding type torque converter turbine outer ring blade fixed rolling riveting machine is taken as the research object in this paper. The overall design of the system and the design and research of the hydraulic auxiliary device are carried out. Through the overall design and research of the hydraulic system of the riveting machine, the manufacturing efficiency of the torque converter is greatly improved.

Key words: torque converter; rolling riveting machine; the hydraulic system; hydraulic auxiliary device

某柱塞泵调压卸荷抗污染结构研究

吴茂民，付振一，余稀梦，党超

（中航力源液压股份有限公司，贵州贵阳550018）

摘要：对柱塞泵污染物形成机理、调压卸荷机构的污染敏感度进行分析。采用抗污染主动抑制技术，在通往柱塞泵调压卸荷机构的油路上设计集成过滤器，避免柱塞泵内部磨损物或外来杂质容易进入电磁阀卸荷机构、调压机构造成活门磨损、卡滞的风险，从而提高柱塞泵乃至液压系统可靠性和安全性。

关键词：柱塞泵；调压卸荷；磨损物；抗污染

中图分类号：TH137文献标志码：A文章编号：1008-0813（2021）01-0067-03

The Research on the Anti-pollution Mechanism for the Piston Pump Pressure

Regulating and Unloading

WU Mao-min，FU Zhen-yi，YU Xi-meng，DANG Chao

（AVIC Liyuan Hydraulic Inc., Guiyang550018, China）

Abstract: The sensitivity of piston pumps to pollutants, pressure regulation and unloading would be analyzed in this research. The active anti-pollution technology which would be used to design a filter in the oil circuit in the valve plate of the piston pump, could avoid the risk that the internal wear debris of the piston pump and external debris are pushed into the unloading solenoid valve or the regulating mechanism. And as a result of the technology, the safety and reliability of the piston pump or even the hydraulic system could be improved drastically.

Key words: piston pumps; pressure regulating and unloading; wear debris; anti-pollution

工程机械液压缸内泄漏故障检测分析

高立龙，李九林，蒋文峰，于雨

（陆军炮兵防空兵学院士官学校 防空兵系，辽宁沈阳110000）

摘要：针对大型工程机械液压缸内泄漏问题，对液压缸进行数学建模。依据模型的动力特性方程对液压缸内泄漏与液压缸的输出动力、活塞的运行速度之间的关系进行研究分析。通过实验，测得了某型推土机液压缸压力变化曲线，验证了液压缸在不同情况下的动力特性，为液压缸内泄漏故障检测提供理论依据。

关键词：液压缸；泄漏；故障诊断；分析

中图分类号：TH137文献标志码：A文章编号：1008-0813（2021）01-0070-04

Leak Detection and Analysis of Engineering Machinery Hydraulic Cylinder

GAO Li-long， LI Jiu-lin， JIANG Wen-feng， YU Yu

(Army Artillery and Air Defense Forces Academy， Shenyang110000, China)

Abstract: Aiming at the leakage problem of hydraulic cylinder of large construction machinery, the mathematical modeling of hydraulic cylinder is carried out. According to the dynamic characteristic equation of the model, the relationship between the leakage in hydraulic cylinder and the output power of hydraulic cylinder and the running speed of piston is studied and analyzed. Through the experiment, the pressure change curve of the hydraulic cylinder of a bulldozer was measured, and the dynamic characteristics of the hydraulic cylinder under different conditions were verified, which provided a theoretical basis for the detection of internal leakage fault of the hydraulic cylinder.

Key words: hydraulic cylinder; leak; fault diagnosis; analysis

某型机液压系统最大输出压力偏低问题分析|

杨莎，范建博，李萌

Analysis of the Low Maximum Output Pressure for the Aircraft Hydraulic System

YANG Sha, FAN Jian-bo, LI Meng

（航空工业西安飞机工业（集团）有限责任公司，陕西西安710089）

摘要：该文通过分析液压系统最大压力偏低问题原因，验证了系统传感器测试位置相对电动泵出口较远而存在压力损失是问题的最终原因。得出结论：液压系统最大输出压力值的设计在进行考量时，应结合系统压力测试位置与电动泵出口间管路压力损失值存在的因素。

关键词：最大压力；测试位置；压力损失；分析

中图分类号：TH137文献标志码：B文章编号：1008-0813（2021）01-0074-03

挖掘机液压缸掉缸故障分析

王绪桥

（力士德工程机械股份有限公司,山东临沭276715）

摘要：活塞式液压缸作为挖掘机液压系统的执行元件，必须克服挖掘机工作负载，按一定规律运动，输出有限的直线位移，完成动臂、斗杆、铲斗三者之间单动作、复合动作。掉缸问题作为液压缸故障之一，需要及时判断解决，以免影响挖掘机的正常工作。该文从液压缸自身因素、液压系统因素等方面进行论述，诠释液压缸掉缸原因。

关键词：液压缸；掉缸；泄漏；液压油；控制阀；密封性

中图分类号：TH137文献标志码：A文章编号：1008-0813（2021）01-0076-04

Failure Analysis of Hydraulic Cylinder Dropping for Excavator

WANG Xu-qiao

(Lishide Engineering Machinery Co., Ltd., Linshu276715, China)

Abstract: As the executive component of excavator hydraulic system, piston hydraulic cylinder must overcome the working load of excavator, move according to a certain rule, output a limited linear displacement, and complete the single action and compound action among boom, stick and bucket. As one of the failures of hydraulic cylinder, the problem of cylinder dropping needs to be solved in time to avoid affecting the normal operation of excavator. This paper discusses the factors of hydraulic cylinder itself and hydraulic system, and explains the reasons of cylinder dropping.

Key words: hydraulic cylinder; cylinder dropping; leakage; hydraulic oil; control valve; sealing performance

混凝土泵车用变量泵控制原理及故障排查两例

施庆永，徐道雷，曹峰，陆夫成

（徐州徐工施维英机械有限公司，江苏徐州221004）

摘要：详细阐述一种斜盘式轴向柱塞变量泵压力切断控制、恒功率控制、电比例排量控制三种控制方式的工作原理，并列举两起故障案例和故障排查方法。为进一步开发新型变量泵和现场变量泵故障排除提供参考。

关键词：变量泵；压力切断控制；恒功率控制；电比例排量控制；故障排查

中图分类号：TH137文献标志码：A文章编号：1008-0813（2021）01-0080-03

Control Principle  of Variable Pump and Two Failure Identify for Concrete Pump Truck

SHI Qing-yong, XU Dao-lei, CAO Feng, LU Fu-cheng

（Xuzhou XCMG SCHWING Machinery Co., Ltd., Xuzhou 221004, China）

Abstract:  Detailed expound perating principle of plunger variable pump, pressure cut off control, power control, ratio displacement control.Enumerate two failure case and failure identify method. Provide consult for developing variable pump and  removing failure.

Key words: variable pump; pressure cut off control; constant power control; ratio displacement control; failure identify

一种液压挖掘机回转动作异常的原因分析与改进

白容，胡勇，陈振雄，邵荣刚

（广西柳工机械股份有限公司挖掘机研究院，广西柳州545007）

摘要：某液压挖掘机样机试制过程中，在经过长时间行走动作后回转马达解锁信号异常，导致上车处于自由晃动状态。经过对其液压系统工作原理分析，找出解锁压力信号异常原因，并提出改进措施。

关键词：挖掘机；回转解锁；负载敏感系统；改进

中图分类号：TH137文献标志码：A文章编号：1008-0813（2021）01-0083-03

Cause Analysis and Improvement for a Kind of Excavator

Rotation Abnormal

BAI Rong，HU Yong，CHEN Zhen-xiong，SHAO Rong-gang

（Guangxi Liugong Machinery Co., Ltd., Excavator R&D，Liuzhou545007, China)

Abstract: During the trial production of a hydraulic excavator prototype, the unlocking signal of the rotary motor was abnormal after a long walk, which caused the vehicle to be in a state of free shaking. After analyzing the working principle of its hydraulic system, the abnormal reason of unlocking pressure signal was found out, and the improvement measures were put forward.

Key words: excavator; rotary unlock; load sensitive system; improvement

基于AMESim的挖掘机平地性能仿真分析

刘建，李文新，王茄任，钟家怡

（广西柳工机械股份有限公司，广西柳州545007）

摘要：针对无法量化评价液压挖掘机平地性能优劣的问题，该文理论分析了挖掘机平地工作原理，根据各个工作装置之间铰接点的关系，推导出了铲斗斗尖距离动臂后支座铰接点的高度和动臂、斗杆液压缸位移之间的公式。结合实际采集的各工作装置液压缸的位移信号，利用仿真软件分析了挖掘机的平地性能，结合仿真出的铲斗斗尖运动轨迹可以量化评价挖掘机平地性能优劣，并可以为优化挖掘机平地性能提供理论参考。

关键词：挖掘机；平地；AMESim；仿真分析

中图分类号：TH137文献标志码：A文章编号：1008-0813（2021）01-0086-04

Simulation Analysis of Excavator Leveling Characteristic Based on AMESim

LIU Jian, LI Wen-xin, WANG Jia-ren, ZHONG Jia-yi

（Guangxi Liugong Machinery Co., Ltd.,  Liuzhou545007, China）

Abstract: Aim at the problem that the performance of excavator leveling can not be quantified, the work principle of excavator is analysed in this paper, according to the relationship of connection point between each working device, the formula for the displacement of boom、arm hydraulic cylinder and the height between bucket tip and connection point of boom's bearing has been deduced. Combined with the displacement signal of the hydraulic cylinder of each working device, the performance of excavator leveling is analysed by the simulation software, combined with the movement trajectory of bucket tip, the performance of excavator leveling can be quantified, and can provide the theoretical reference for optimization of excavator leveling performance.

Key words: excavator; leveling; AMESim; simulation analysis

装载机转向限位缓冲系统的应用

卢金龙，莫雄超

(广西柳工机械股份有限公司，广西柳州545007)

摘要：铰接式装载机的传统机械转向限位装置影响机器的操作舒适性，优秀的转向限位缓冲系统能够消除整机的极限位冲击和晃动，且不影响转向系统的可靠性和安全性等。该文通过对比分析几种常用的转向限位缓冲系统的工作原理，研究各系统的应用效果。

关键词：装载机；转向系统；限位缓冲；应用

中图分类号：TH137文献标志码：A文章编号：1008-0813（2021）01-0089-03

Application of Loader Steering Limit Buffer System

LU Jin-long, MO Xiong-chao

(Guangxi Liugong Machinery Co., Ltd.，Liuzhou545007, China)

Abstract: The steering limit device of the articulated loader affects the operation comfort of the machine. The excellent steering limit buffer system can eliminate the limit impact and sway of the whole machine without affecting the reliability and safety of the steering system. This paper compares and analyzes the working principles of several commonly used steering limit buffer systems to study the application effect of each system.

Key words: loader; steering system; limit buffer; application

浅谈工程机械用风扇马达液压系统方案

吴玉姣，范武德，梁振国

(广西柳工机械股份有限公司，广西柳州545007)

摘要：随着整机噪声要求越来越高、节能降耗的需求、工况适应性需求等，风扇马达液压系统得到广泛应用，该文从风扇马达液压系统目前常用的几个方案进行了对比分析，定量系统液压风扇驱动，定量系统电控液压风扇驱动，变量系统液压风扇驱动三个系统的优缺点进行分析。

关键词：液压风扇驱动；变量系统；工程机械；分析

中图分类号：TH137文献标志码：A文章编号：1008-0813（2021）01-0091-03

Discussion on Fan Motor Hydraulic System Scheme for  Construction Machinery

WU Yu-jiao, FAN Wu-de, LIANG Zhen-guo

(Guangxi Liugong Machinery Co., Ltd.， Liuzhou545007, China)

Abstract: As the working condition of machine noise, energy-saving requirements, needs, etc., the fan motor of the hydraulic system is widely used, this article from the several currently used for the hydraulic system of fan motor has carried on the contrast analysis, quantitative hydraulic fan drive system, the quantitative system electronically controlled hydraulic fan drive, variable hydraulic fan drive system and the advantages and disadvantages of the three systems are analyzed.

Key words: hydraulic fan drive; variable system; construction machinery; analysis

挖掘机无自动怠速和无行走动作偶发故障的排查处理方案

陈振雄，胡勇，罗成发，周良峰

（广西柳工机械股份有限公司挖掘机研究院，广西柳州545007）

摘要：针对挖掘机持续故障发生的机理和原因的排查相对指向性较高，但对于偶发故障的问题的分析和排查始终是困扰服务和技术人员的难题，该论文介绍一种针对挖掘机无自动怠速和无行走动作偶发故障的问题排查和原因分析，为解决此类液压系统偶发故障提供了故障排查的步骤和技术分析思路。

关键词：偶发故障；负流量；自动怠速；先导压力

中图分类号：TH137文献标志码：A文章编号：1008-0813（2021）01-0094-03

A Elimination and Processing Methods for Excavator without Automatic

Idling and without Travel Motion Accidental Fault

CHEN Zhen-xiong, HU Yong, LUO Cheng-fa, ZHOU Liang-feng

(Guangxi Liugong Machinery Co.,Ltd., Excavator Research Institute, Liuzhou545007, China)

Abstract: For the continuity fault, there have directivity mechanism and cause analysis, but for accidental fault, it is difficult to elimination and search root cause. This paper introduces a elimination and processing methods for Excavator without automatic idling and without travel motion accidental fault. Offer a technology analysis thought and elimination cause method.

Key words: accidental fault; negative flow; automatic idling; pilot pressure