At present, the domestic production can be roughly divided into three types: economic bending machine, popular bending machine and high-grade bending machine. Economic pipe bending machine is basically open loop control; Popular pipe bending machine adopts semi-closed loop control technology, the resolution can reach 1 micron; High-grade closed-loop control, while with high precision, high speed, compound, with a variety of compensation functions, new control functions, automatic diagnosis, resolution can reach 0.1 micron, the computer can be programmed instead of people.

1. Dig a small hole and weld a stop valve on the end cover of the return oil pool of cnc pipe end forming machines. Add another item to the operating procedure of the shearing machine: the stop valve should be closed when driving, and turn the valve immediately after each cutting to facilitate the trace nitrogen leaking into the oil pool to the atmosphere in time.

2. When the manual button or foot switch is loosened, the hydraulic oil in the laid off body is pressed back to the oil pool by moving down the piston of the nitrogen accumulator, and the main cylinder piston is moved up through the oil circuit to make the tool holder rise, and the hydraulic oil in the upper chamber returns to the oil pool through the main circuit.

3. When it is found that the tool holder is difficult to lift, the accumulator should be supplemented with nitrogen.

4. When the tool holder is raised slowly, the O-ring in the accumulator should be replaced accordingly and the nitrogen should be sufficient.

5. The piston in the accumulator needs to be replaced when nitrogen is frequently filled.

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