动滑轮

To Know fixed pulley and movable pulley.

知道定滑轮、动滑轮、滑轮组的作用。

Experience the process of investigating how fixed pulley and movable pulley work, and then know the way of researching by observation and contrast.

经历探究定滑轮、动滑轮工作特点的过程，进一步掌握用观察、对比来研究问题的方法。

In the design, It causes the hydraulic cylinder with a movable pulley the stroke to reduce one half, and avoides using a stroke longer hydraulic cylinder.In this way,it reduces difficulty of the hydraulic cylinder's produce.

在设计中，用一个动滑轮使液压缸的行程减少了一半，避免使用行程较长的液压缸，减少了制造液压缸的难度。

In the design,It causes the hydraulic cylinder with a movable pulley the stroketo reduce one half, and avoides using a stroke longer hydrauliccylinder.In this way,it reduces difficulty of thehydraulic cylinder's produce.

在设计中，用一个动滑轮使液压缸的行程减少了一半，避免使用行程较长的液压缸，减少了制造液压缸的难度。

The connector of all kinds of wire ropes has simple structure and reliable performance, especially the multi wheels movable pulley and new structure pulley block provide the condition for oil pumping machine saving energy, and saving energy above 50% as well as decreasing the cost of the oil pumping machine above 50%.

各种钢丝绳连接器结构简单、性能可靠。尤其是多轮动滑轮、新结构滑轮组，为抽油机节能提供了条件，可节能50％以上，降低抽油机造价50％以上。

This invention provides new-type movable pulley oil pumping machine, wheel axle bidirectional oil pumping machine which possesses the function of energy saving and efficiency increasing.

本发明提供了新式动滑轮抽油机、轮轴抽油机、双向抽油机，具有节能增效的作用。

Wind the wire rope from the two guiding block of the pillar, pass through the fall block, fix on the pillar or on the pulling shaft axle of weight limit appliance

4.4.4将卷扬机上钢丝绳从顶梁的两只导向滑轮上绕过，穿过吊笼上的动滑轮，固定在顶梁上（或顶梁上悬挂的重量限制器的拉杆轴上）。

The wire rope pulled by the lifting mechanism wind through the 2 guiding blockof the pillar and cross the fall block, fix and suspend on the weight limiting instrument of the pillars, the operation staff can control the up and down movement and stop movement of the suspension coop by the control board.

提升机构拉出的钢丝绳绕过顶梁的两只导向滑轮穿过吊笼上的动滑轮，固接、悬挂在顶梁之上的重量限制器上，操作人员通过操纵台控制吊笼的上下运动和停止动作。

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％。