Structure of derrick crane
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The present invention has a moving block frame that can move horizontally forward and backward on the upper surface of the main frame constituting the derrick to allow the moving block frame to move forward and backward, and the upper surface of the moving block frame The stack block assembly that can move to the right (Sheave block frame) (Sheave block) by the assembly of the hanging hook to suspend to the invention to be able to move up and down, left and right, and move freely.