起重机

As the housing construction component of suspension bridge, and when the tower crane tower, the pillar of the beam, the truss are bent stem working stress.

工程构件诸如房屋的柱、悬索桥、斜拉桥的塔、塔时起重机的立柱、桁架梁的上弦杆等工作时均处于受压状态。

She has become a pacemaker in china in the rim fields of heavy truck crane,tractor of airplane,underground olader,special vehicle,transport equipment at seaport,mineral vehicle,seafloor facility,smelting facility,underground equipment,earthwork machinery,especially loader,and other engineering vehicles,She has passed the ISO9001 international quality management system certificate.

在中国，山东工程机械钢圈厂已成为重型汽车、起重机、飞机牵引车、铲运车、特种运输车、港口运输及码头设施、矿用设备、海底设施、冶炼设施、井下设备、土方工程机械等工程机械车辆钢圈生产行业的领先者，企业已通过ISO9001质量体系认证。

The crane consists of four main parts, namely, the boxtype frame bridge, trolley traveling mechanism, crab and electric equipment.

本起重机由箱形桥架，大车运行机构，小车，电气设备四部分构成。

The paper designed and calculates the driving section and transferring section, hoisting and balancing arms, tower cap and dolly of the rotary tower crane experimental system.

这一试验台的建立对实现起重机自动化，提高工作效率、安全性、可靠性有着重要的意义和价值。

Not only the overall scheme for the frame of this system is determined, but also the scheme for transmission of luffing motion and rotating motion is done. In addition, the design and calculations are done for driving, transmitting, hoisting, balancing jib, tower cap and dolly of luffing motion.

本文确定回转塔式起重机试验台的总体结构方案，确定变幅运动和回转运动的传动方案，设计和计算变幅运动的驱动部分，传动部分，起重臂，平衡臂，塔冒和小车。

Along with the rapid development of building industry, tier and high buildings in big and middling cities have been increasing, the tower crane has been the main construction machine in the upright transportation of tier and high buildings.

随着建筑业的不断发展，各大中城市多层和高层建筑不断增多，塔式起重机已成为多层和高层建筑施工垂直运输的主动脉。

Study engineering drawings and blueprints, determine the materials required, and plan the sequence of tasks to cut metal most efficiently · Construct patterns and templates as guides for layouts · Lay out reference points and patterns on heavy metal according to component specifications · Rig, hoist and move materials to storage areas or within worksite · Assemble and fit metal sections and plates to form complete units or subunits using tack welding, bolting, riveting or other methods · Set up and operate various heavy-duty metal-working machines such as brake presses, shears, cutting torches, grinders and drills, including computer numerical control equipment, to bend, cut, form, punch, drill or otherwise form heavy-metal components · Install fabricated components in final product.

研究机械制图和图纸，决定所需材料，并计划工作顺序，有效地切割金属。 2。构建模式和模板作为布局向导 3。按照组件规格在重金属上设计参考点和模型 4。装备、起重机和运输材料入库或在工地场内 5。组装和安装金属部件和板材形成全套装置，或通过点焊、螺栓连接，铆接法或其他方法形成次单元。 6。建立并操作各种重金属加工机床，例如压弯机、剪床、割炬、磨钻机，包括数控设备，压弯、切割、成型、打洞、钻孔，或相反形成重金属组件。 7。在成品上安装已制造好的组件 Structural metal and platework fabricators and fitters 结构金属和板金加工制造工和安装工

Adjust cam of the height limiter beside the hoisting drum, so as to hook the limited height(the point of the root of tower crane jib frame should reduce 2.5m, it's the limited height), enable the limit switch, the hook can not hoist, then if the hook can't act, then start it again just load onto the ground.

2调整起升卷筒旁边高度限位器中的凸轮，使吊钩达到预定的极限高度(起重机臂架根部铰点高度减去 2.5 米，即为预定极限高度)时，限位开关动作，吊钩不能上升，再启动时只能下降。

Taking QY80 auto-crane's rocker mechanism of four一axle steering system asexample,this paper presents a new method which applies multibedy system Kinematics theory toanalyse mechanism's spatial motion, builds up mathematical model of optirnization for the rochermechanism of steering System, and chooses minimization adoptive random search method to developan optimization design microcomputer program,Using aboving method and program , this paper fi-nally optimlzes each design Variable, and obtains better resul...

以QY80汽车起重机四轴转向摇臂机构为例，利用多刚体系统运动学理论对机构作了空间运动分析，建立了转向摇臂机构优化设计的数学模型，并用改进了的约束随机方向搜索法编写了优化设计的微机软件，并已应用于生产实践。

This is a steel plate for crane.

这是用于起重机的钢垫板。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。