FIELD: oil and gas industry.
SUBSTANCE: device has body, and differential plunger with holder and compacting elements, saddle, spreader bushing and spring-loaded clamp on axis, mounted therein. Body is made with its possible connection to lower portion of product column. Spreader bushing is made eccentric and is mounted in eccentric recess. Clamp is provided with several springs. Differential plunger is connected to holding sleeve. Sleeve is made with possible interaction with holder being part of assembly of lower portion of drilling column. Holder controls closing of cut valve after letting chisel into plunger. Sleeve is mounted at distance from clamp, greater, than length of face engine, chisel and holder.
EFFECT: higher reliability and safety.
2 dwg
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