Overview
Used HDPE pipe fitting machines are the most cost-effective choice for small and medium pipe manufacturers to produce HDPE elbows, tees, reducers and flange fittings. Compared with new machines, second-hand equipment features low investment, fast delivery and quick production startup.
Common Problems & Professional Solutions
|
Fault Location |
Common Machine Problems |
Production Impact |
Effective Solutions |
|---|---|---|---|
|
Injection System |
1. Screw and barrel wear, poor plasticization 2. Material backflow, unstable injection volume 3. Injection pressure fluctuation 4. Nozzle clogging and material leakage |
HDPE fittings have bubbles, sink marks, uneven weight; high raw material waste; unqualified product rate increases |
Replace worn screw and barrel; clean and polish nozzle; replace check ring; calibrate injection pressure and speed parameters |
|
Clamping System |
1. Insufficient mold clamping force 2. Tie bar aging and uneven tension 3. Slow mold opening and closing 4. Mold flash easily occurs |
Fitting burrs (flash), mold damage risk, long production cycle, low hourly output |
Adjust clamping force parameters; overhaul and tension tie bars; replace aging hydraulic seals; clean mold surface and calibrate mold parallelism |
|
Hydraulic System |
1. Hydraulic oil leakage and oil pollution 2. Oil pump abnormal noise and pressure instability 3. Solenoid valve stuck 4. Machine overheating during operation |
Irregular machine action, sudden shutdown, frequent equipment alarms, shortened machine service life |
Replace old hydraulic oil and filter element; overhaul oil pump and solenoid valve; clean oil circuit; install heat dissipation equipment |
|
Temperature Control System |
1. Heating ring damage and slow heating 2. Thermocouple failure, inaccurate temperature display 3. Local overheating or insufficient heating |
HDPE material decomposition, black spots on fittings, incomplete melting, product cracking after molding |
Replace damaged heating rings and thermocouples; calibrate temperature control system; set segmented heating parameters according to HDPE material characteristics |
|
Electric Control System |
1. Aging PLC and circuit failure 2. Touch screen malfunction and data loss 3. Sensor failure and parameter disorder |
Random shutdown, unable to save production parameters, difficult to adjust processes, low production stability |
Sort out and replace aging circuits; upgrade PLC and touch screen; replace faulty sensors; reset and lock production parameters |
|
Auxiliary Equipment |
1. Dryer low drying efficiency, wet raw materials 2. Chiller poor cooling effect 3. Manipulator positioning deviation |
Fitting deformation, water bubble defects, long cooling time, low automatic production efficiency |
Overhaul dryer and chiller; clean cooling water circuit; calibrate manipulator positioning; replace damaged auxiliary parts |
We supply various models of used & refurbished HDPE pipe fitting machines, HDPE pipe extrusion lines, PPR/PVC pipe production machines. All equipment is in stock and can be shipped quickly.
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