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Through calculation and analysis, the reason is that the piston rod bending: boom cylinder with both ends of the rack and the movable arm is connected with a tilt phenomenon, bearing width is too small, or improper assembly instructions to adjust the clearance between the side wear, bearing width should be increased; the boom cylinder bottom discharge deposition material accumulation and lower outside of the boom cylinder wear, whichindicated material accumulation is serious, the larger friction rotation.

The improvement measures are as follows: increasing the support width, the width of the general support is 1.2 to 1.5 times the diameter of the piston rod. In the assembly process, make full use of the adjustment pad to ensure that the two ends of the boom cylinder and the frame and the arm with the gap and neutral, improve the adjustment pad material wear resistance. The improvement of discharge structure (see photo); increase the discharge plate opening distance H1 and the angle alpha, reduce the accumulation of blanking, blanking to smoothly discharged naturally; increase the boom cylinder bottom is connected to the host at the discharge distance of H2, in order to facilitate the discharge of large size stone. The manual provisions on accumulating materials periodically clear requirements. After the improvement, the piston rod is not bent again.