Coal Mine Rock Bolt Pull Tester

Pull Testing Rock Bolts

The Coal Mine Rock Bolt Tension Tester checks whether a rock bolt in roof or rib support reaches its design anchorage. The tester is a pulling jack plus a pump: the bolt passes through the jack center hole, pressure pulls on the bolt, and the gauge reads the pull value. Bolts that test low are supplemented, which keeps support quality under control.

The manual version needs no power and suits spot checks; the pneumatic version runs on compressed air for faster pulls and larger inspection batches. Two rated forces cover the work: LDZ200 at 200 kN and LDZ300 at 300 kN. The 26 mm center hole fits bolts from 16 to 24 mm, both rebar and threaded-steel types, and the pulling stroke is 60 mm, enough displacement to read anchorage.

The LDZ200 jack weighs 12 kg and the LDZ300 jack 15 kg, so one person carries it to the hole. The pump weighs 10 kg manual or 16 kg pneumatic. A shock-resistant pressure gauge with a large dial gives a clear reading that crews can read at a glance.

MOQ is one unit; choose manual or pneumatic to match inspection frequency. Bolts that test below the design value are supplemented until the support is proven, which keeps roof control under control. The shock-resistant gauge has a large dial face that crews read at a glance, and the accuracy meets the relevant national standard for pull testing. The 26 mm center hole takes bolts from 16 to 24 mm, both rebar and threaded steel, and the 60 mm stroke gives enough displacement to read anchorage. The manual pump weighs 10 kg and the pneumatic pump 16 kg. The manual version suits spot checks, while the pneumatic version speeds up larger inspection batches.

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