回转起重机

BZZ heavy cantilever crane is scheduled column cantilever crane extension products, the aircraft using the rotary bearing structure with variable cross-section arm, from the kind of up to 2.5-16 meters radius of gyration of 7-12 meters.

BZZ重型悬臂起重机是定柱式悬臂起重机的延伸产品，该机采用了回转支承与变截面臂结构，起种高达2.5-16米，回转半径达7-12米。

Therefore, the in-depth research on the process of dynamic loads when braking ,the analysis about the causation and influence factor of the dynamic loads" emergence is necessary to the design of the circumgyrate machinery Aim at above problems, this text treats the portal crane"s boom system as a research object ,using finite element analysis and mechanism kinetics as theories foundation and analysis means ,utilizing ANSYS8.1 to research the dynamic effect of the crane boom under the circumstance of braking.

针对以上问题，本文以MQ4033门座起重机臂架系统为研究对象，以有限元和机械动力学为理论基础，运用ANSYS8.1对臂架系统在回转制动时的工况进行动力学分析，获得了臂架系统的模态特征以及在回转制动时的动力响应。

Xuzhou Rothe Erde Slewing Bearing Co., Ltd is the main producer in wldwide specializing in manufacturing big diameter slewing bearings, which are widely used in various kinds of fields, such as excavats, mobile cranes, harb and shipyard cranes, wind energy equipments, robots, medical scanners, naval vessels and radars.

罗特艾德公司是世界范围最主要的大直径回转支承生产商，产品主要应用于挖掘机、汽车起重机、港口起重机、风力发电设备、机器人、医用扫描仪、航空航天、军工等领域，产品销往世界各地市场。

Xuzhou Rothe Erde Slewing Bearing Co., Ltd is the main producer in wldwide specializing in manufacturing big diameter slewing bearings, which are widely used in various kinds of fields, such as excavats, mobile cranes, harb shipyard cranes, wind energy equipments, robots, medical scanners, naval vessels radars.

罗特艾德公司是世界范围最主要的大直径回转支承生产商，产品主要应用于挖掘机、汽车起重机、港口起重机、风力发电设备、机器人、医用扫描仪、航空航天、军工等领域，产品销往世界各地市场。

Slewing mechanism is one of the most important mechanisms for crawler crane, of which dynamic characteristics affect the working performance of whole machine directly.

回转机构是履带起重机重要的机构之一，其动态特性直接影响整个起重机的工作性能。

Production HGQ type fixed slewing cranes for ports, power, metallurgy, industrial and mining enterprises and other cargo-handling.

生产的HGQ型固定式回转起重机适用于港口、电力、冶金、工矿企业的货物装卸等。

The experimental system consists of a rotary mechanism and a luffing mechanism and is used for the simulation of luffing motion and rotating motion.

回转塔式起重机实验台由回转机构和变幅机构组成，模拟回转塔式起重机的变幅运动和回转运动。

Column crane arm is a light and small lifting machine in which CD1, MD1 electric pulley and chain hoist are used t...

定柱式电动全回转旋臂起重机柱式旋臂起重机是CD1、MD1型电动葫芦及手拉葫芦配套使用的一种轻小型起重机械。

A type of arm derrick such as fix the type to turn round the derrick, tower type derrick, automobile derrick, tire, track derrick etc..

臂架类型起重机如固定式回转起重机、塔式起重机、汽车起重机、轮胎、履带起重机等。

The experiment system is consisted of transferring machine and rotary machine, to simulate the motion of transferring machine and rotary machine.

回转塔式起重机实验台由回转机构和变幅机构组成，模拟回转塔式起重机的变幅运动和回转运动。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。