Structure Design of Hydraulic Slip of Heavy-Duty Snubbing Unit

To address the partial failure problem of hydraulic slip of snubbing unit under high load, the three structural parameters of slot width, slot position and tooth crest width of slip were studied by the method of test and simulation. The hydraulic slip structure design method of combining the finite element analysis method, orthogonal test method, linear weighting method and Matlabs optimization toolbox was proposed. The results show that the weak parts of hydraulic slip are slip teeth, which have uneven distribution of stress in the circumferential direction and the axial direction. Mises stress in the circumferential direction of slip basically shows a symmetrical trend. Mises stress in the axial direction presents a saddle shape that larger values are at both ends and smaller value is in the middle. The analysis shows that the optimized slip structure has the slot width of 5 mm, the tooth crest width of 0.23 mm, and the angle between the slot plane and the left and right end faces of 21.67°. The study results are of great significance to the improvement of the stress distribution of hydraulic slips and the improvement of clamping capacity.