Shandong Xinwen Mining Township has successfully applied pneumatic blockers recently. The staff of the company added a turning arm to the middle shaft of the blocker, and used the high pressure wind in the downhole to drive the cylinder to push the arm, so that the pawl of the blocker was switched between the horizontal and vertical positions to achieve the car blocking effect. The pneumatic blocker can realize long-distance operation, simple structure, convenient operation and maintenance, and reduce the labor intensity of the post work.

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