查询词典 crawler tractor

The conclusion is that the maximal gradient: of the tractor skidding trail depends on: the adhesive force while the tractor is uphill without load, when the full loaded tractor is downhill using the engine to brake the tractor and control the tractor velocity, the reliable lubrication of the engine.

结论是：规范关于集材坡道最大坡度的规定，主要由空车上坡时附着力、重载下坡时利用发动机制动且变速器挂低档控制拖拉机下滑速度及保证发动机可靠润滑等因素决定。

Applying the software ADAMS for dynamic simulation and Pro/E for three-dimensional design creates the mechanical system of virtual prototyping model of the 200t crawler crane. The models of the drag bar, the spring backstop, the luffer rope and the crawler in the system are established well by ADAMS/View module. The dynamic simulation of the complete mechanical system is researched at series of work condition, which occurs possibly the crawler crane boom backward tipping as the crawler crane unloads suddenly.

本文应用虚拟样机技术动力学仿真软件ADAMS，结合三维实体设计软件Pro/E构建了200t履带起重机的虚拟样机机械系统模型，并利用ADAMS/View模块完善了系统中拉板、弹簧式防后倾装置、变幅钢丝绳和履带模型：研究了履带起重机突然卸载时可能发生臂架后倾的一系列工况下，整机机械系统模型的动力学仿真。

The corporation has 350 tons crawler crane, 275 tonnes crawler cranes, crawler crane 150 tons, 50 tons crawler crane, tower crane 100 tons, 80 tons of tower crane, 55-ton crane vehicle, Thin wall Crane, 60 tons of crane and concrete mixing stations, truck, Tanker complete construction machinery and equipment 1495 supporting Taiwan, with a total of 98,000 24208.86KW, technology and equipment reached 66,400 yuan per capita / person.

公司拥有350吨履带式起重机、275吨履带式起重机、150吨履带式起重机、50吨履带式起重机、100吨塔式起重机、80吨塔式起重机、55吨汽车式起重机、FZQ1250附壁式起重机、60吨龙门吊、混凝土搅拌站、泵车、罐车等配套齐全的施工机械设备1495台，总功率为24208.86KW，人均技术装备率达到6.64万元/人。

Tractors used in the experiments were wheel tractor, crawler tractor and holder/ walking tractor. The influence of soil compaction on wheat growth and soil structural discontinuity was discussed.

试验所使用的耕作机械包括轮式、履带式和手扶式三种拖拉机，分析了土壤压实对小麦生长以及土壤结构不连续性的影响。

In the experiments, soil was tilled by rotary tiller at the depth of 10 cm, and compacted by holder/ walking tractor, wheel tractor and crawler tractor in one pass (T1), two passes (T2) and four passes (T3), while no compaction (T4) was applied as control.

试验中，先用旋耕机对田块进行旋耕，耕深10 cm，然后使用手扶式、轮式、履带式拖拉机在旋耕后的田块中通过1次（T1）、2次（T2）、4次（T3）以对土壤进行压实处理，对照组（T4）不作任何压实处理。

Based on the working condition of the tractor, a new type of electric tractor drive system which combines a motor and a gear, and the evaluation index and the calculation method for dynamic performance of electric tractor are suggested; taking an electric tractor drive system as design object, the balance graph of drive-resistance force, climbable gradient under different shifts, and continuous working time are calculation analyzed.

根据电动拖拉机作业特点，提出了一种电动机和变速箱相结合的电动拖拉机传动系统结构方案，并给出了电动拖拉机动力性能和经济性能评价指标以及电驱动系统主要参数的设计计算方法，以基于串励直流电动机的某型号小四轮电动拖拉机电驱动系统为设计实例，计算分析了该电动拖拉机的驱动力-行驶阻力平衡图、不同挡位下的爬坡度以及连续作业时间。

Researches show that the drive force characteristics of the electric tractor drive system based on series DC motor is close the ideal characteristics, the curves are concave, low speed with constant power, and high speed with constant torque; the electric tractor has large working speed under different shifts, but the extensive coincidence speed shows that the variable ratio of the gear is unreasonable; the maximum climbable gradient of this electric tractor is more than 30%, and does not need frequent shift when working for its extensive climbable gradient; there are many influence factors of continuous working time, which the more obvious factors are working speed and working load, the working time increases with the increase of the working speed and working load.2. Simulation researches on the drive characteristic of the electric tractor.

研究结果表明：基于串励直流电动机(来源：ABC21论文网www.abclunwen.com)的电动拖拉机电驱动系统的驱动力特性场接近理想驱动力特性场，其各挡下的驱动力特性是一组下凹的曲线，低速恒转矩，高速恒功率；同一行驶速度下所对应高挡驱动力大于低挡驱动力，这是由电机的调速特性决定的；电动拖拉机各个挡位下具有较广的稳定作业速度范围，但是各个挡位之间速度重合的范围较多，说明所用变速箱变速比与电动机匹配不合理；电动拖拉机最大爬坡度达到30%以上，并且各挡爬坡度变化范围较广，作业过程中不需要频繁换挡；影响电动拖拉机连续作业时间的因素较多，其中作业行驶速度和作业负荷影响最为明显，作业负荷越大，连续作业时间就越短，作业速度越快，连续作业时间就越短。2、电动拖拉机驱动特性仿真研究。

The bar chart to the right illustrates just how sharply sales of crawler dozers have grown since 2002. For both dozers and loaders, sales fell flat in 2002- by our estimates dropping to approximately 9,450 units of crawler dozers and about 1,200 units of crawler loaders -from peak sales in the late 1990s.

右边的图表清楚地显示了自2002年履带式推土机销量的快速增长情况。2002年推土机和装载机销售没有增长——据我们估计履带式推土机的销量会从九十年代末的顶峰降到大约9450台，履带式装载机会降到约1200台。

The hydraulic system model of the hydraulic cylinder backstop, which in general used on the large-tonnage crawler crane, is established by ADAMS/Hydraulics module. And the joint simulation between the mechanical system and the hydraulic system of the crawler crane virtual prototyping is implemented. The different effect of the spring backstop and hydraulic cylinder backstop for the crawler crane boom backward tipping is analysed and compared.

对目前大吨位履带起重机普遍采用的液压缸式防后倾装置，用ADAMS/Hydraulics模块构建该装置的液压系统模型，实现履带起重机虚拟样机模型机械、液压系统的联合仿真，并分析比较了弹簧式和液压缸式两种防后倾装置对臂架后倾的影响。

Pressure crawler tractor tire wheel tractor towing machine.

气压履带式牵引机。轮式牵引机。轮带式牵引机。

For every one of my New Year resolutions, I have been a backslider for years.

说到我的新年决心，我每年都做

With empathy and focus on a feeling level, we can all relate to the common ground of mutuality of emotions.

有了同情心和感觉上一级的重点，我们都可以涉及到相互的情感共同点。