偏心轴

Power-law fluid is used to describe the Non-newtonian rheological property of the produced fluid in a polymer-driving well; the governing equations, boundary and initial equations of power-law fluid in eccentric annuli with the inner cylinder reciprocating axially is established in bipolar coordinates system; formulas of instantaneous flow rate and stress distribution on the outwall of the inner cylinder of the unsteady flow of power-law fluid in eccentric annuli with the inner cylinder reciprocating axially are established.

在理论上，用幂律流体模型描述了聚合物驱油井产出液的非Newton流变性；建立了双极坐标系下幂律流体在内管做轴向往复运动的偏心环空中非定常流的控制方程及边界条件和初始条件方程；建立了双极坐标系下幂律流体在内管做轴向往复运动的偏心环空中流动时瞬时流量和流体在内管壁上的压力分布计算公式。

A novel cable climbing robot applied to cable maintenance was introduced. It is centered orientable wheel-based, omni-directional cable climbing robot. The climbing mechanism of the robot and its working process were described. The driving force needed was analyzed, and the critical force needed for maintaining robot staying cable was calculated. The eccentricity allowed between center of robot and cable axis when the robot moving on inclined cable was discussed, and the least eccentric magnitude was calculated.

提出了一种应用于缆索维护的爬缆机器人机构实现方案，该机器人采用中心可转向的轮式驱动；介绍了机构组成及工作原理，在建立缆索曲线约束模型的基础上分析了机器人的驱动力，计算出了机器人能够在斜缆上工作所需要的临界驱动力；讨论了机器人在斜缆上工作时机器人轴和缆索轴不重合而出现偏心的原因，提出了减小偏心的方法，并计算出了为保持机器人对斜缆的适应性所需要的最小偏心量。

Taking HPAM solutions as an example , the unsteady flow of power-law fluid in eccentric annuli with the inner cylinder reciprocating axially is calculated; the distribution of velocity, flow rate and:stress distribution on the outwall of the inner cyinder is obtained; the effect of eccentricity, stroke and frequency on distribution of velocity is analysed; the effect of eccentricity and axial movement on stress distribution on the outwall of the inner cylinder is analysed too.

在计算上，以HPAM水溶液为例，数值计算了幂律流体在内管做轴向往复运动的偏心环空中的流动，得出了这种流动的速度，流量和流体在内管壁上的压力分布；分析了环空偏心度以及内管冲程和冲次对流体速度分布的影响；分析了环空偏心度和内管轴向运动对流体在内管壁上压力分布的影响。

Taking HPAM solutions as an example, the unsteady flow of power-law fluid in eccentric annuli with the inner cylinder reciprocating axially is calculated; the distribution of velocity, flow rate and stability parameter is obtained; taking HEC solutions as another example, the flow of second order fluid in eccentric annuli with the inner cylinder moving axially is calculated too; the distribution of velocity and stress is obtained; the effect of eccentricity and axial movement on stress distribution on the outwall of the inner cylinder is analysed.

在理论上，分别用二阶流体和幂律流体模型描述聚合物驱油井产出液的非Newton流变性；分别建立了双极坐标系下二阶流体和幂律流体在内管做轴向往复运动的偏心环空中非定常流的控制方程及边界条件和初始条件方程；建立了幂律流体在内管做轴向往复运动的偏心环空中流动的稳定性参数和流体在内管壁上的压力分布计算公式；建立了二阶流体在内管做轴向运动的偏心环空中流动的流体在内管壁上的压力分布计算公式。

The theoretical and computational results show that an important reason resulting in eccentric wear of the inner cylinder and the pumping rod lies in the nonuniformity of the stress distribution on the outwall of the inner cylinder which yields excentralization effect of the pumping rod when swabbing fluid flows in eccentric annuli with the pumping rod moving axially in a well.

在实验上，通过不同重量百分比浓度的HPAM水溶液在内管做轴向往复运动的偏心环空中非定常流实验，把由理论公式算得的时间平均流量与实验中测得的时间平均流量做了比较，验证了本文数值计算幂律流体在内管做轴向往复运动的偏心环空中非定常流方法的正确性；上述的理论与计算表明，抽油机井杆管偏磨的一个重要原因是，在聚驱工况下，抽汲液体在抽油杆做轴向运动的井筒中流动时，抽汲液体作用在抽油杆外壁上的压力分布的不均匀性所引起的抽油杆在井筒中的偏心效应。

It relies on two vortex plate to work with each other movements which has a very high machining accuracy and mutually gearing, in which one fix on the machine rack, called the static vortex plate; the other is driven by the partiality shaft to move around the static disk base circle center , called the moving vortex plate.

它是依靠加工精度很高且相互啮合的两个涡盘的相互运动而工作的，其中一个固定在机架上，称为静涡盘；另一个由偏心轴驱动绕静盘基圆中心平动，称为动涡盘。

For eccentric locking collar type bearing, rotating the eccentric locking collar to lock the shaft by hand in direction of the rotation. Then tighten the set screw which located at the eccentric locking collar.

对于带偏心紧固套的外球面球轴承，将偏心套套在轴承内圈的偏心台上，沿轴的旋转方向拧紧偏心套，再用内六角螺钉扳手拧紧偏心套上的紧定螺钉。

Cone crushe r consist of frame, transmission device, hollow eccentric shaft, bowl-shaped bearing, crushing cone, springs and hydraulic pressure station for adjusting discharge opening.

锥体 crushe r 包括帧，传动装置，空心偏心轴，碗型轴承，圆锥破碎，弹簧和液压站调整放电开放。

Bearing and shaft fastening methods are: the outer sleeve with eccentric spherical bearing, the eccentric sets Presentation at the bearing inner ring of the eccentric stage, along the axis of rotation direction of tightening eccentric sleeve, and then wrench tighten the screw Hexagon eccentric sleeve on the set screws can be.

轴承与轴的紧固方法是：对带偏心套的外球面轴承，将偏心套套在轴承内圈的偏心台上，沿轴的旋转方向拧紧偏心套，再用内六角螺钉扳手拧紧偏心套上的紧定螺钉即可。

And guarantee the space between 2 to 3 mm, at the same time, should guarantee the even space to prevent rubbing the safety brake, the adjustment method is that: relax the rolling wheel screw, adjust the direction of axle, after being adjusted, you should fix the screw.

调整要求保证侧轮和压轮与导轨间的间隙在单侧2-3mm之间，同时还要保证笼顶安全锁两边楔块与导轨架的间隙均匀，以防止正常运行时刮蹭安全楔块，调整方法是：松开导向轮紧固螺栓，调整导向轮中的偏心轴的方向，使间隙让到要求，调整完毕后必须轮紧固螺栓紧固。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。