Sky pulley for annulus test of rod-pumped well

The invention provides a sky pulley for an annulus test of a rod-pumped well, and belongs to the field of oil field equipment. The sky pulley comprises a pulley body, a supporting rod and a base, thepulley body is rotatably arranged at the first end of the supporting rod, a sliding groove is formed in the outer edge of the pulley body, the base is fixedly installed at the second end of the supporting rod, a base ring used for being inserted into the blowout prevention pipe is arranged at the outer edge of the base, and a notch is formed in the base ring and penetrates through the two ends ofthe base ring. And a movable inserting plate is detachably inserted into the notch. By means of the head sheave, the head sheave can be separated from the steel wire before testing, and therefore thehead sheave is prevented from abrading the steel wire. 本公开提供了一种用于抽油机井环空测试的天滑轮，属于油田设备领域。所述天滑轮包括滑轮、支撑杆和底座，滑轮可转动地布置在支撑杆的第一端，滑轮的外边缘设置有滑槽，底座固定安装在支撑杆的第二端，底座的外边缘设置有用于插装在防喷管上的底座环，底座环上设置有缺口，缺口贯穿底座环的两端，缺口中可拆卸地插装有活动插板。通过本公开提供的天滑轮可以在测试前使得天