牵引的

Rigid PVC pipe production line is mainly used in the manufacture of the plastic PVC pipes with various tube diameters and wall thickness in the aspects such as the agricultural and nonstructural plumbing, cable laying etc. Thin set is composed of the conical twin-screw extruder, vacuum forming table , dragger, cutter, stirring up rack etc. The screws extruder and the extractor adopt the imported AC frequency employ the superior goods. The prime mover has the traction modes such as to claw, three-claw and so on. It may choose the saw blade cutting type or the planet cutting type. It is additionally attached with measuring apparatus and the intensifying device. The unit is of the reliable performance and high production efficiency. This company may allocate the special installation for the manufacture of the inner wall spiral coil and core ply blister tube set according to the clients requirements.

硬质PVC 塑胶管材出产线主要有阿谁与出产农用给排水、建筑给排水、线缆铺设等方面的各类管径、壁厚的塑胶PVC管材，该机组由锥形双螺杆挤出机、真空定形台、牵引机、翻料架等构成螺杆挤出机及牵引机采用进***流变频调速设置，真空泵以及牵引机电均采用优质产品牵引有二爪、三爪、四爪、六爪等牵引体式格局可选用锯片或者行星切割形式，另可计长及增厚装置，机组机能可靠，出产效益高，本公司可更具客户的要求，配备布置专用装置出产螺旋消音管以及芯层发泡管机组

It could be concluded that the drawing performance and the riding comfort of the tractor-trailer combinations would been improved obviously when the optimized flexible drawgear was used.

同时发现使用经过优化设计的柔性牵引装置后不但大幅度降低了牵引架上动态纵向力的峰值，因而明显改善了挂接车辆在非平稳道路离散事件激励条件下运行时的牵引运行状况和纵向平顺性状况

When the flexible drawgear is used, the peak values both of the dynamics longitudinal force and of its instantaneous PSD have decreased largely, and the distribution status of the instantaneous PSD along both the time axles and the frequency axles have been improved. So the working stability of the tractor-trailer combinations braking process would been improved when the optimized flexible drawgear was used.

仿真分析和试验结果均表明，使用柔性牵引装置后，牵引架动态纵向力峰值及其瞬时功率谱的峰值有了大幅度的降低，动态纵向力瞬时功率谱密度沿时间轴和频率轴的能量分布得到了改善，这说明使用柔性牵引装置后有利于提高挂接车辆制动工况的工作稳定性。

The propulsion control system is one of the four subsystems of theMaglev vehicle. The propulsion control theory with field-oriented control is the key technology of the propulsion control system. In this paper,the characteristics of Maglev vehicle propulsion control system with FOC aredeeply studied and analyzed.

牵引控制系统是高速磁悬浮列车四大子系统之一，基于磁场定向控制理论的牵引力控制又是牵引控制系统的核心技术，本文深入研究和分析了在不同磁场定向控制方式下高速磁悬浮列车的牵引特性。

The increases in the cell density in the sutures of the treated groups were higher as compared to the two controlled groups for 3 7 14days indicating that cellular hyperplasia in the expanded sutures were accelerated by the protraction .The cell density in the palatomaxillary sutures and in the frontomaxillary sutures differed in increase ways at the two time points of 21th day and 28th day suggested that the mode of bone formation in the circummaxillary sutures is different from one another..5 The expression of Proliferating Cell Nuclear Antigen were always higher than the controls in the course of this study,which i

而在21、28天时间点两个骨缝与对照组相比在相同时间点增长程度明显不相一致，提示我们不同的上领骨周围骨缝在前牵引作用下改建方式过程可能不一。5、在上领前牵引作用下，上领骨的额领缝内的PCNA的阳性表达一直高于对照组，提示前牵引促进上领骨周围骨缝内细胞增殖活动增强。

The engine main circuit have to be gurranteed drawing the torque of electric motor and rotation speed wholly to do regulateing of independence ,But also possess extensive setting range SS7's mould electric locomotive adopts Quan Kongqiao and semi bridge accuseeing series connection to make up the monophase bridge style commutation electric circuit ,The coil power supply is encouraged against the stringtrain by the electric motor the drawing armature to 3 parallels operation ,Still there is an excitation commutation bridge ,He encourages the coil power supply with 3 electric motors drawing together to the series connection ,Moreover has one another accuses the regulating action .

机车主电路必须保证牵引电动机的转矩和转速都可作独立的调节，而且要有宽广的调节范围。SS7型电力机车采用一个全控桥和一个半控桥串联组成单相桥式整流电路，向3台并联工作的牵引电动机电枢与串励绕组供电，还有一个励磁整流桥，向串联在一起的3台牵引电动机他励绕组供电，并具有相控调节作用。可以实现机车无级调速和无级削磁。SS7型电力机车采用再生制动方式，再生制动时，牵引电动机作直流发电机工作，并且将电能馈送回接触网，此时电力机车相当于一个移动的发电站。

Methods One band with a lingual button was bonded on the crown of lingual inclined lower second molar, then a removable, uprighter was put on, the tipping molar was uprighted by using buccal traction force produced by the latex elastics between the button and the hook of removable uprighter.

先在患牙上装戴一焊有舌侧扣的带环，再将预先制作好的带颊侧牵引钩的下颌可摘式磨牙颊向竖直器装戴就位，然后在舌侧扣与矫正器的牵引钩之间使用乳胶弹力圈对患牙进行颊向牵引。待患牙扶正后再使用固定矫正器进行精细调整。

A kind of traction system capable of ensuring the balance of the lift cabin used in hydraulic lift is composed of support beam fixed in the lift shaft, 4 traction mechanisms separately corresponding to the four conners of the lift cabin, each of which is composed of a cylinder, several guiding pulleys and a tracting cable.

装的牵引机构，所说的每一牵引机构都包括一个固定安装在支梁上的带滑轮的油缸，若干个也安装在支梁上的导向滑轮和三条曳引绳，所说的其中一条曳引绳烧着本牵引机构所属的油缸上的滑轮及导向滑轮，一端与本牵引机构所对应着的电梯轿厢

Table 2.2 Infrastructure in different transport modes Road - Public No inherent guidance Infrastructure provided - Private Artificial, shared way centrally at public expense and at nominal cost to users Rail -Heavy Inherent guidance Track and control centrally - Light Artificial, dedicated way provided and charged to - Metro operators at full cost or owned by operators Air Natural, shared way Infrastructure provided by third party at full cost Maritime -Coastal/short Natural, shared way Infrastructure provided by sea No inherent guidance third party and charged at full Deep sea cost Inland water Natural or man-made Infrastructure provided by shared way third party and charged at full No inherent guidance cost Pipelines Artificial, dedicated way Infrastructure usually Inherent guidance provided by user All modes (except pipelines, although a travelator or moving walkway' may be considered a pipeline) carry both freight and passengers.

表2.2 不同运输方式的基础结构公路公共私人没有固有的牵引人造的，共享的方式基础设施由中央以公共费用和以使用者名义上的成本来提供铁路重型轻型地铁固有的牵引人造的，独占的方式铁轨和控制设施以完全成本的形式提供和向运营者收取费用或者由运营者所独有航空自然的，共享的方式基础设施由第三方提供并以完全成本方式收取费用海运沿海／近洋远洋自然的，共享的方式没有固有的牵引基础设施由第三方提供并以完全成本方式收取费用内河水运自然或人工的，共享的方式，没有固有的牵引基础设施由第三方提供并以完全成本方式收取费用管道人工的，专属的方式固有的引导基础设施通常由用户提供所有的运输方式（除了管道，尽管自动扶梯也可以被看作是一种管道）既能载人也能载货。

It was distracted to close the cleft after 3-day latency period. The active distraction period was 7 days and the rate was 1mm/day.

经过3天的延迟期后，牵引输送盘关闭裂隙，牵引期为7天，牵引速度为1mm／天。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐