e. No vacuum
Check the plugging of the vacuum pump intake, such as blocking, dredging with needles; check the normal work of the vacuum pump; check the leakage of the vacuum pipeline; check the hole in the middle of the core screw, if the plug is blocked, such as clogging, dredging with fine wire;
f. Pipe size oversize difference
The size of the outer garden can be changed by adjusting the vacuum degree; the size of the outer garden can be changed by adjusting the traction speed; and the size of the inner hole of the sizing sleeve is corrected.
g. Excessive difference in garden degree
Adjust the angle of the nozzle in the vacuum setting machine and the spray box to make the pipe cool even; check the vacuum setting machine, the water level in the spray box and the pressure of the water pressure meter to make the spray amount big and powerful; check the water temperature condition of the vacuum setting machine and the spray box. If >35 C, the freezing water system or the spray cooling box should be configured and the water route is checked. Clean the filter; adjust the process; check and correct the hole size of the sizing sleeve; adjust the pipe guide clamping device to correct the ellipticity of the pipe.
h. Pipe wall thickness unevenness
Adjust the wall thickness on the mold, adjust the angle of the nozzle in the vacuum setting machine and the spray box, make the pipe cool even, adjust the outlet of the diameter set, make the water out evenly, disassemble the mould, check the loosening of the internal screw in the mold and tighten it again.