该螺杆由芯轴和几个空心螺杆段组成，对于不同的物料，只需更换其中某些空心螺杆段即可。
The screw consists of core spindle and several hollow screw segments which can be replaced easily for different materials.
针对这种情况，分析了拆卸螺杆上螺纹发生损坏的原因，自行设计制作了新的拆卸套具及空心螺杆，取得了很好的效果。
Upon analysis of the screw thread damage on the dismantling screw, new dismounting kit and hollow screw have been designed and made by the plant independently a.
利用空心杆向井筒内掺入活性水或稀油，降低油流阻力，实现应用螺杆泵开采深层稠油。
Active water or light oil is sent downhole through hollow rod to reduce oil flow resistance, thus producing heavy oil from deep formation through screw pump.
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