At present, the CNC pipe bending machines produced in China can be roughly divided into three types: economical pipe bending machines, popular pipe bending machines and high-grade pipe bending machines. Economic pipe bending machines are basically open-loop control; The universal pipe bending machine adopts semi closed-loop control technology, and the resolution can reach 1 micron; The high-grade pipe bending machine adopts closed-loop control, with high precision, high speed and compounding. It has various compensation functions, new control functions and automatic diagnosis. The resolution can reach 0.1 micron, and the computer can replace human programming.
1. Dig a small hole in the end cover of the oil return tank of the hydraulic pipe bending machine and weld a stop valve. Add another rule to the operating procedures of the shearing machine: the stop valve should be closed during start-up, and the valve should be unscrewed immediately after each shearing, so that the trace nitrogen leaked into the oil tank can be discharged into the atmosphere in time.
2. When the manual button or foot switch is released, the hydraulic oil pressure in the laid-off body is returned to the oil pool through the downward movement of the piston of the nitrogen accumulator, the piston of the main oil cylinder is moved upward through the oil circuit to raise the tool rest, and the hydraulic oil in the upper chamber is returned to the oil pool through the main circuit.
3. If it is difficult to lift the tool holder, supplement nitrogen to the accumulator.
4. When the tool holder is lifted very slowly, replace the O-ring in the accumulator and sufficient nitrogen.
5. When nitrogen charging is frequent, the piston in the accumulator needs to be replaced.
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