ｄ、限位器d， limiting device限位器为一个底部带限位板和流---道的短节，接在定子的尾部，其作用是施工作业时给转子限位以防止下入过头而失去作用和杆柱脱落时防止杆柱掉入井底。the limiting device is a short section with bottom limit plate&distribution channel， which is connected to the tail of the stator. its function is to limit the rotor to the rotor during ctruction1， so as to prevent it from falling into the overhead&lose its function&prevent the rod from falling into the bottom when the rod string falls off.
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