1) gallows crab bucket
龙门抓斗
1.
This paper briefly introduces the technical process of the erection of main beam joints and main beam of 5t double-beam gallows crab bucket by usi ng 500×500 portal frame, sleepers and 50 t and 30 t autocranes, and expounds em phatically the overall design of the schemes, the selection of bearing platform s steel columns, the verification of the strength, and the erection of the platf orm, etc.
主要介绍了利用500×500龙门架,道木及50t、30t汽车吊进行5t双梁龙门抓斗主梁接头、主梁安装的工艺过程,并对其方案总体设计情况、支撑平台钢柱的选择、强度校验及平台搭设等环节进行了重点阐述。
2) grab bucket gantry
抓斗龙门吊
3) gantry grab ship unloader
门式抓斗卸船机
4) grab bucket
抓斗
1.
Optimization of the control on the falling reference of the grab bucket of ore ship unloader;
矿石卸船机抓斗下沉量控制优化
2.
According to the actual working conditions of bolting-shotcrete supporting in coal-mine tunnel,the working mechanism of different buckets was studied,their merits and demerits were analysed,and the double-crank grab bucket with assistant linkage was proved to be an ideal choice of grabbing materials in coal-mine tunnel because its motion trace was definite and symmetric and occupied lesser space.
从巷道锚喷支护中物料抓取的实际作业环境出发,对拟采用的几种抓斗的工作机理进行了分析研究,比较了各方案的优缺点,指出辅助连杆的双曲柄抓斗的运动轨迹确定、对称,且具有在竖直方向上占用空间最小的特点,是井下巷道施工中物料抓取的理想选择,这种设计方法能够为相关抓取装置的设计起到参考作用。
3.
This paper analyses in quantity for the key factors to influence the fold and unfold of the grab bucket in the four-drum grab bridge ship unloader.
对四卷筒抓斗卸船机抓斗开闭的影响因素进行定量分析,根据悬索理论,给出了悬垂段钢丝绳的悬垂方程。
5) grab
[英][ɡræb] [美][græb]
抓斗
1.
Several problems in designing long stay bar double jaw boards grab;
长撑杆双颚板抓斗设计中的几个问题
2.
Numerical analysis of the disabled grab and some improvements in structure;
抓斗失效的数值分析及结构改进
3.
Simulation and analysis of grab lifting dynamic load coefficient;
抓斗起升动载系数的仿真分析
6) clamshell
[英]['klæm,ʃel] [美]['klæm,ʃɛl]
抓斗
1.
The clamshell excavates the deep and shallow wall troughs because it has the characteristics of high working efficient, easy to move and .
深、浅墙均采用抓斗挖槽， 因其具有工效高、移动方便、施工无震动等特点。
2.
In the construction of foundation seepage control wall for construction cofferdam of Wangpuzhou Water Control Project in the Hanjiang River,the clamshell was used to dig the trench.
在汉江王甫洲水利枢纽施工围堰基础防渗工程中，采用抓斗挖掘槽孔，成功地建造了３道固化灰浆防渗墙，总截水面积达１５１７８。
3.
When a clamshell dredger is used to carry out over-depth and over-width dredging,accuracy control is always one of the difficulties.
抓斗式挖泥船进行超深超宽施工时,精度控制始终是难题之一。
补充资料：物料搬运机械：抓斗
靠颚板开闭抓取和卸出散状物料的吊具。抓斗根据操作特点一般可分为双绳抓斗﹑单绳抓斗和马达抓斗﹐最常用的是双绳抓斗。
双绳抓斗 有支持绳和开闭绳﹐分别绕在支持机构和开闭机构的卷筒上。图1 双绳抓斗的工作过程 
为双绳抓斗的工作过程﹕a为支持绳和开闭绳同时下降﹐张开斗口插入料堆。b为收紧开闭绳﹐颚板闭合并抓取物料。c为抓斗闭合后支持绳和开闭绳同时上升。d为支持绳不动﹐开闭绳下降﹐斗口张开并卸下物料。双绳抓斗工作可靠﹐操作简便﹐生产率高﹐应用广泛。采用两组双绳后就成为四绳抓斗﹐工作过程与双绳抓斗相同。
单绳抓斗 支持绳和开闭绳用同一根钢丝绳。通过特殊锁扣装置使钢丝绳轮流起到支持和开闭的作用。单绳抓斗的卷绕机构较简单﹐但生产率低﹐大量装卸作业时很少采用。 马达抓斗 本身装有开闭结构﹐通常采用标准的电动葫芦。这种抓斗可挂在起重机吊钩上﹐藉起升机构升降。其特点是操作比单绳抓斗方便﹐抓取性能好﹐生产率较高﹐但自重较大﹐需要有供开闭机构用的电缆。随着液压传动的发展﹐已出现液压马达抓斗﹐因其结构紧凑渐被推广。特殊情况下还采用气压传动的抓斗。
抓斗根据被抓取物料的堆积密度又分为轻型(如抓取谷物)﹑中型(如抓取砂砾)和重型(如抓取铁矿石)3类﹔按颚板数分为双颚板抓斗和多颚板抓斗﹐最常用的是双颚板抓斗。对于大块矿石﹑铁屑和废钢等宜采用多颚板抓斗﹐因为它具有多爪﹑切口尖的特点﹐易于插入料堆﹐可得到较好的抓取效果。还有一种仿剪刀结构原理的剪式抓斗(图2 剪式抓斗
)﹐它的抓取力能随颚板的闭合而逐渐增大﹐在闭合终了时达到最大值﹔其斗口的开度和覆盖物料的面积也比一般抓斗为大﹐提高了抓取能力﹐有利于清扫料场和船舱﹐但对于大块物料因其初始抓取力小﹐效果较差。
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参考词条