Drag for sand instrument in pit

The utility model provides a drag for sand instrument in pit, the last check valve that connects gradually including top -down, plunger pump, storage sandpipe, down the check valve, shovel the head. The plunger pump includes the urceolus and sets up at the inside interior plunger of urceolus, interior plunger includes that top -down connects gradually draws liquid pipe, connector, piston, the urceolus includes position sleeve and outer tube that top -down connected gradually. Piston outer wall cover has the sealing ring, seals up in outer inside pipe wall, the connection of piston bottom is used for adjusting the end cap of sealing ring elasticity. This instrument simple structure, this drag for sand instrument in pit follows the protection oil layer angle, adopts brand -new design, and without pump truck and other auxiliary assembly, the activity tubular column can be realized pulling sand setting in the well out about only needing, has avoided the injury of income well liquid to the stratum, effectively pro