查询词典 percussion hammer

The results show that water hammer pressure is closely related to vaporizing time, and that the frequency of data acquisition is of obvious influence on the fluctuation of water hammer pressure.

在此瞬态的水力过渡过程中，当压力变化降至液体的饱和蒸汽压力以下，在管道中将会有气体和蒸汽析出，并在特定的位置汇集而产生&空穴&，形成水柱分离现象。

It has been described as "a hammer and anvil" campaign, the hammer being the Anglo-Portuguese Army, commanded by Sir Arthur Wellesley, 1st Duke of Wellington, with 40,000 to 80,000 men, pounding the French army against the anvil - the Spanish armies and guerrillas and the Portuguese militia.

这场战役被称作&铁锤与铁砧&战役，&铁锤&代表的是数量为4万到8万的英-萄联军，指挥官是惠灵顿首任公爵，阿瑟·韦莱斯利；同另一支&铁砧&力量——即西班牙军队和游击队，以及葡萄牙民兵相配合，痛击法国军队。

Was founded in Chengde Rong Mao 80 years, the production of ball mill liner, various models of jaw crusher tooth plate, hammer crusher liner within the care, castor-oil plant section, combined hammer and all kinds of high-chromium alloy high manganese steel castings, low chrome alloy casting ball products, with thirty years experience in a large casting enterprise.

承德荣茂铸钢有限公司始建于80年代，是生产球磨机衬板、各种型号鄂式破碎机齿板、锤式破碎机内护衬、蓖条、复合式高铬合金锤头及各种高锰钢铸件、低铬合金磨球产品的具有三十年铸造经验的大型铸造企业。

Research on water hammer with gas in pressure conduit system Through physical experiments, researches on pressure conduit system with gas releasing and liquid column separating, which consist of observing flow patterns, testing the conditions under which liquid column separation brings into existence and the water hammer in water interception collision, and studying effects resulting from gas content and different water velocities in pipeline, was done.

输水管道系统中含气水锤研究通过物理试验，对有压输水管道系统中的气体释放与液柱分离进行了研究，观察其流态、测试液柱分离发生的条件及断流弥合水锤压力，研究了含气量、流速等参数对液柱分离的影响。

The upsetting test of metal powder sintered preform by blow speed of the hydraulic press,crank press,pneumatic hammer and high energy rate forging hammer was reported.

研究了用液压机、曲柄压力机、空气锤及高速锤的打击速度对粉末冶金烧结体进行的镦粗试验。

In order to make good use of the expert's experience and knowledge in the forging technology and die design process, object-oriented knowledge modeling methodology is proposed in this paper based on the character of hammer forging die design, and the knowledge model and knowledge database of the knowledge-based hammer forging design system is built .

将模具设计的经验和知识应用于锻造工艺与模具设计过程中，针对锤上模锻设计的特点，提出了面向对象的知识建模方法，建立锤上模锻设计支持系统的知识模型和系统的知识数据库。

By analyzing and contrasting, this mathematical model has been confirmed to be used in the blowing energy data controls of the hydraulic pressure die forging hammer, which offers basis for the procedure controls of the hydraulic pressure die forging hammer.

通过分析对比，确定了这一数学模型可以用于液压模锻锤打击能量的数据控制，为液压模锻锤的程序控制提供了依据。

This paper introduced the structure and operating principle of pneumatic hammer,the selection of drilling parameter,the effect of field experiments and the existent problems. pneumatic hammer ; drilling technology,deviation prevention ; wiping

它兼容了气体钻井和冲击回转钻井的优势，其机械钻速一般比牙轮钻头回转钻井高，美国早在50年代3000~3500m深井中，成功地采用了空气锤钻井技术，而国内以前运用该技术于地质勘探、水文

According to the requirement of silde-resistant pile construction,this paper analyses feasibility that pneumatic DTH hammer drilling applies to construct slide-resistant pile on the basis of introducing the features of pneumatic DTH hammer.Then an applied example is given.

文章在介绍风动潜孔锤钻进特点的基础上，根据抗滑桩施工要求，分析了风动潜孔锤用于抗滑桩施工的可行性，并举出了其应用实例。

WEDGE ANCHOR, TIE WIRE ANCHOR, HEAVY DUTY SHIELD ANCHOR, SLEEVE ANCHOR,METAL FRAME ANCHOR,DROP IN ANCHOR,CEILING ANCHOR,ZINC ALLOY HAMMER DRIVE ANCHOR,ZINC ALLOY EASY DRIVE ANCHOR,HOLLOW WALL ANCHOR,MNAY KINDS OF PLASTIC ANCHOR,SUCH AS NYLON HAMMER DRIVE ANCHOR, FISH LIKE ANCHOR,EASY DRIVE ANCHOR.

车修壁虎，套管壁虎，金属管壁虎，重型组合式壁虎，鱼眼壁虎，内迫壁虎，插片壁虎，锌合金快速壁虎，锌合金打入式壁虎，中空壁虎，各种尼龙打入式壁虎，旋入式壁虎，鱼型壁虎，石膏板壁虎等。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。