浅谈叉车的两种传动系统

本文介绍了叉车传动系统中常用的两种液压方式：液力变矩传动和静压传动系统，着重从系统的可靠性、传动效率及对发动机的影响等方面比较分析了两种系统的性能特点。     

长江液压件厂新开发DZ12多路阀

长江液压件厂最近开发的DZ12型多路换向阀较好地满足了我国引进德国林德公司12.5t静液压传动叉车液压阀国产化的需要,是我国引进中小吨位全液压叉车最理想的替代产品。这种阀具有能耗低、调速性能好、操作力小及工作油口有多种辅助功能等优点。主要性能参数是:通径12mm、公称压力F级20MPa、E级16MPa;公称     

基于声强技术的叉车变速器噪声源识别研究

液力变速器作为内燃又车的重要传动机构,其噪声水平是衡量内燃叉车质量的重要指标之一.要降低液力变速器的噪声,首先必须对其主要噪声源进行识别.采用声强测量法对一台内燃叉车液力变速器的噪声源进行表面辐射噪声测量,通过分析等声强线图和三维声强图,对影响液力变速器的主要噪声源进行排序,找出了液力变速器的主要噪声源,为降低该系列内...     

中型板式喂料机的传动改造

介绍对HBG型中型板式喂料机传动中利用偏心轮带动棘轮进行调速,改为利用电磁调速电机带动链轮传动进行调速,从而达到传达平稳、安装检修方便、使用寿命延长的目的。     

滑移式装载机静压传动系统原理及特性分析

本文给出了静压传动在工程机械中常用的传动方案，并对滑移式装载机的静压传动系统的组成、DA控制实现原理及特性进行了综合分析。     

大型塔式起重机起升调速方法对比分析

依据塔式起重机起升机构驱动、传动原理,给出起升速度的计算公式,并根据此公式分析起升机构的调速方法;对各种调速方法的特点及应用进行对比和分析,并通过实例说明几种调速手段相结合,能够得到更加理想的调速效果。     

集中液压传动的轮式挖掘机牵引性能分析

本文以总功率变量泵驱动定量液压马达为例,对集中液压传动的轮式挖掘机底盘传动系的牵引性能进行了初步分析。把“发动机液压泵液压马达”看作一台新的“发动机”,并求它们联合工作的输出特性曲线,由此证明,因发动机、液压泵和液压马达的共同调速作用,当输出功率在一定范围内变化时,其调速性能优于机械式传动系,其传动系各档总传动比之间的公比也可大于机械式传动系。在传动系处于各个档位时,因液压泵的变量作用,均可在所需范围内实现无级调速,其牵引力和行驶速度成双曲线关系,牵引功率为常数。本文还对传动系各档之间公比与泵的变量系数之间关系、档位数的确定、各档总调速范围的计算等进行了论述。     

林德液压产品展示

<正>高压产品K-02动力单元无极变速成就最佳性能经过与长期合作伙伴的共同努力,林德液压为行业定义了传动系统的新标准。领先的模块化驱动设计技术实现静压无级调速,造就了变速箱功率分流的核心技术。在小型机械应用领域,其组件结构紧凑,轴伸可附加传动元件连接于传统的变速箱。K-02组件亦可通过PTO应用在全静压驱动的系统中。在为客户定制产品这一理念的引导下,林德液压完成了手动换挡变速系统向自动变速系统的转换。     

AUSA越野叉车登陆中国市场

2006年11月的BAUMACHINA工程机械展上,西班牙AUSA公司展出其生产的装备4X4静压传动系统的越野叉车,最大爬坡度可高达40%,能承担极端恶劣工况下的施工作业,在建筑、矿山、油田、林业和农业等领域极受欢迎.AUSA期待借BAUMA工程机械展将越野叉车概念介绍给中国用户,同时征召中国各省代理商,开发中国市场.     

对变频调速异步电机设计与制造技术的探讨

随着新型电力电子器件的不断涌现和现代控制理论的发展,交流调速传动控制系统已经遍及国民经济各部门的传统领域,本文根据笔者多年工作经验,通过对近几年国产变频调速异步电机的发展与研制,分析了变频调速电机设计特点.并对目前电机制造厂所采用的制造工艺和先进技术进行了简要分析,仅供参考.     

内燃叉车高原环境适应性问题分析

从内燃叉车的高原环境适应性技术要求出发,研究了典型高原环境条件对内燃叉车各系统性能的影响,提出了提高内燃叉车各系统高原环境适应性的措施,强调了高原环境适应性研究在内燃叉车发展中的作用和地位.     

重装叉车自动停机保护系统

重装叉车自动停机保护系统可在叉车出现异常情况时切断发动机燃油,实现停机保护.介绍该保护系统的组成部件、工作原理及工作过程.该系统可以实现对重装叉车关键零部件的保护.     

Forklift with a lithium-titanate battery during a lifting/lowering cycle: Analysis of the recuperation capability

Opportunities of storing electric energy recovered from an electro-hydraulic forklift truck are studied with a lithium-titanate battery as energy storage. Instead of a traditional valve control, the lifting system is controlled directly with an electric servo motor drive and a hydraulic pump capable of operating also as a hydraulic motor during potential energy recovery. The paper describes the proposed speed control method of forks to improve the energy efficiency characteristics of the forklift, including the operation time and lifetime of the energy storage device. The analysis results for the proposed systems are compared for different battery sizes from the life cycle point of view.     

蓄能器在叉车节能技术中的应用

在确定蓄能器回收势能液压系统的基础上,分析皮囊式蓄能器初始容积、充气压力等参数对叉车节能效果的影响,并通过试验进行验证,对推动叉车节能技术的研究有积极作用.     

叉车液力变速器噪声源识别的试验研究

液力变速器的噪声水平是衡量内燃叉车质量的重要因素之一.对某型内燃叉车液力变速器进行分解试验,采集3种拆卸状况下液力变速器的振动、噪声信号,通过振动噪声频谱对比分析和噪声边频分析,验证了与液力变矩器同轴的齿轮的啮合激励是液力变速器的主要噪声源,为降低该系列内燃叉车液力变速器的表面辐射噪声提供有效的依据.     

Determination of accidental forklift truck impact forces on drive-in steel rack structures

The paper addresses the problem of determining the accidental forklift truck impact forces on steel storage racks. Based on first principles of mechanics, simple models of a loaded forklift truck and a drive-in racking structure are presented. Model masses, as well as stiffness and damping coefficients are calibrated against experimental results obtained from tests of a forklift truck and a drive-in racking structure. Comparisons between experimental results and solutions obtained from the simple mechanical models show that the simple models accurately reproduce the static and dynamic behaviours of their associated structures. Based on the drive-in rack impact test results presented in a companion paper (Gilbert and Rasmussen, submitted for publication) [1] and the simple mechanical models for drive-in racks, actual impact forces are calculated and presented. Finally, using the impact test results and the simple mechanical models, the actual motion of the forklift truck body is calculated. This motion, being a common characteristic to all drive-in racking impacts, allows impact forces to be obtained for various pallet loads, impact elevations and rack characteristics. Thus, the paper concludes with a general method for calculating forces generated under forklift truck impact.     

Impact tests and parametric impact studies on drive-in steel storage racks

Extensively used in the industry to store goods, steel storage racks are frequently subjected to accidental impact forces from operating forklift trucks. There is currently little understanding of the nature of these impact forces, leading to occasional catastrophic failures because of inadequate structural design. International racking design codes deal with impact but use an arbitrary value of impact force with no scientific justification. This paper focuses on an impact-sensitive type of storage rack, called “drive-in racks”. Contrary to classical “selective racks”, where pallets are stored on beams and where each single pallet is always accessible, “drive-in racks” allow the forklift truck to drive into the rack to store pallets on beam rails, one after the other, on the first-in, last-out principle. This type of design leads to slender uprights in the down-aisle direction, only restrained at the base and at the top. When subjected to an impact force, the bowing of the upright triggers progressive failure by allowing the pallets to drop through.This paper presents experimental results obtained from tests on a complete full-size drive-in rack structure subjected to the impact of a forklift truck. Parametric impact studies using finite element analysis are also presented. Factors affecting the sensitivity of drive-in racking structures to impact are investigated and conclusions are drawn about the parameters most significantly influencing the progressive collapse of this type of rack under impact.     

电动轮矿用车防溜控制系统

露天矿山生产过程中,时常有大型电动轮矿用车溜车事故发生,造成巨大经济损失.介绍一种电动轮矿用车防溜控制系统,通过该控制系统对电动轮矿用车挡位方向信号与速度传感器测得的电动轮矿用车的速度方向信号进行布尔运算,判断电动轮矿用车是否处于溜车状态.如果电动轮矿用车处于溜车状态,则通过安装在轮马达电机上的速度传感器采集溜车速度,一旦溜车速度大于设定速度,防溜控制系统则控制制动系统进行制动,防止溜车,确保电动轮矿用车的安全运行和露天矿山的安全生产.     

八连杆叉装机产品结构分析

随着国内物流行业的迅速发展,市场物流量大幅增长,大量使用诸如40ft高柜集装箱、高护栏货车、后方装卸的长型或超长型厢货车,这些集装箱或车辆均要求有高举升、大伸距且具有机具平移功能的叉装机械与之配套.但长期以来,可供选择的仅有伸缩臂叉装机,为此国内厂商纷纷推出一些在装载机基础上改装而成的连杆式叉装机,但都算不上真正意义上...