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The YJ type one-way shock absorber (bumper)is a kind of drilling tool . It can effect shock absorbing and shock reductionby means of elastic deforming and anticoagulation produced from hydraulic oilunder the outside force . Its advantages such as simple structure , reliableworking performance and easy to maintain can well absorb shocking and vibratingload from drill strings during drilling operation. Therefore, using of shockabsorber can raise in structure the service life of drill bit and drill pipe ,speed up drilling ,get rid of drilling jumping, well protect surface equipmentsand drilling tools.


Model

YJ62C

YJ70C

YJ80C

Y94C

O.D. (mm)

160

178

203

241

I.D.

47

57

64

70

Max.stroke (mm)

120

120

150

150

Max.bit weight (KN)

343

392

490

540

Tensile strength (KN)

1500

1500

2000

2000

Ambient temperature (°C)

-40150

-40150

-40150

-40150

Connection

NC46

NC50

6  5/8REG

7  5/8REG

Pull-down overall length (mm)

4100

3800

4100

3820

Weight

400kg

560kg

740kg

1100kg