clamshell operation

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

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。

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。

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

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

Simulation and analysis of grab lifting dynamic load coefficient;

抓斗起升动载系数的仿真分析

Gordeev prism grab

水底等深柱形采样抓斗

electric overhead travelling grab crane

桥式电动抓斗起重机

ship unloader with rope trolley

绳索小车抓斗卸船机

self-propelled grab dredger

自动推进式抓斗挖泥船

double-beam bridge type grab crane

双架桥式抓斗起重机

tipper lorry with grab

设有抓斗的自动卸斗货车

Closed mechanical grabs for dredging shall be maintained to avoid spillage and shall seal tightly while being lifted.

应使用密封式机械抓斗，以免物料溅溢，并于提起时保持抓斗密封。

Research on the Grab Open-closed Problem and Steel Wire Vibration of Four-Drum Grab Unloader;

四卷筒抓斗卸船机抓斗开闭及悬垂钢丝绳跳动研究

Technical Reconstruction for the Main Beam of 20t Grab Crane in One Plant;

某厂20吨抓斗起重机主梁的技术改造

Research to Electric Control System of Bridge-Type Grab Ship Unloader;

桥式抓斗卸船机电气控制系统的研究

Research on Energy Recycling Speed Control System of Grab Ship Unloader;

抓斗卸船机能量回馈型调速系统研究

Analysis about a Failure of Electro Hydraulic Grab

“HOPE STAR”轮船载液压抓斗故障处理与分析

On Revising Rails of Grab Bucket in the Pellet Fine Stockroom for Sintering Shaft Urnace

烧结竖炉球团精矿库抓斗吊轨道改造

An optimization of vibrating feeding system of bridge-type grab ship unloader

桥式抓斗卸船机振动给料系统的优化

Analysis on Verticality of Trench Forming by SANY SH400 Hydraulic Diaphragm Wall Grab

SH400型连续墙液压抓斗成槽垂直度分析

Any of various devices with two hinged jaws, used for dredging or digging.

抓斗，挖斗任何一种具有两个铰接夹爪用来挖泥或铲土的设备

He seized his hat and gathered his cloak about him

他抓起帽子，披上斗篷。

We must seize the key to do well PC(Party conduct) and CCHA( construction of a clean and honest administration) and to strive against corruption;

抓好党风廉政建设和反腐败斗争,必须抓住关键;