In the refrigerator production process, the foaming mold usually contains multiple movable slider structures to achieve precise molding of complex structures such as door buckle edges, box grooves , etc. The slider is an important dynamic component in the mold, and its smooth movement is directly related to the foaming effect and the quality of the finished product.
However, during long-term use, some users often encounter the problem that the slider cannot be reset smoothly. This may not only cause the mold to fail to close and uneven foaming, but may even damage the mold and equipment in serious cases. Below we systematically analyze the common reasons why the refrigerator mold slider does not reset from three aspects: mechanical system, hydraulic system, and electronic control system:
The structure of the mold slider relies on the coordinated movement of mechanical parts such as guide posts, guide rails, positioning pins, and limit bolts. If the slider
is worn on the surface, stuck with foreign objects, or loose parts after long-term operation , it may be blocked during the reset process.
Especially in an environment where foaming materials splash or condensed water accumulates, poor lubrication or rust on the guide surface will also seriously affect the smoothness of sliding.
Suggested check points:
- Check if the guide pin/guide sleeve is worn unevenly, makes abnormal noise or is dry
- Is there any residual glue or debris on the joint surface between the slider and the mold cavity?
- Check whether the locking screws and stoppers are loose or dislocated.
- Check whether the slider is deformed or cracked
Treatment measures:
Clean up debris in time, polish and repair slightly worn parts; serious damage requires replacing the slider or repairing the guide system.
2. Hydraulic system problems: insufficient pressure or oil circuit blockage
Most refrigerator foaming molds use hydraulically driven sliders to open and close . If there is insufficient oil pressure or discontinuous movement, it is mostly due to abnormalities in the hydraulic system.
- The oil pump is aging or damaged, and the oil supply is insufficient.
- The oil pipe joint is loose or blocked, causing slow movement
- The oil cylinder seal fails, causing internal pressure relief and making it impossible to complete the push or pull action.
Suggested check points:
- Is the oil pump operating normally? Is the pressure value fluctuating abnormally?
- Check whether the hydraulic pipeline is leaking, blocked or has air mixed in.
- Is the slider cylinder piston responsive and is there any jamming?
Treatment measures:
Clean the oil circuit, replace seals, correct the hydraulic system pressure, and replace aging parts (such as oil pumps or cylinders) when necessary.
3. Electronic control system problems: signal interruption or control error
Modern refrigerator foaming production lines are mostly automated, and the movement of the slider depends on the opening and closing signals sent by the electronic control system.
If the signal is not sent or received correctly , the slider will not move even if the hydraulic system is intact.
Common questions include:
- Controller program fault or output failure
- The limit switch is damaged and cannot detect the position of the slider
- Aging of contactor or relay causes action delay
- The power supply is unstable or the line contact is poor
Suggested check points:
- Is the PLC control signal output normally?
- Is the limit switch position accurate and the action sensitive?
- Check whether there are any signs of burning, loose connections or looseness in the control cabinet
Treatment measures:
Check each item according to the electrical drawings, and replace the limit switch, terminal block or reset the PLC program if necessary.
4. Prevention suggestions: standard maintenance to extend service life
In order to avoid frequent slider reset failures, it is recommended to perform the following maintenance regularly:
- Clean the active parts of the mold every shift and keep them clean and lubricated
- Check the hydraulic oil level and pipeline tightness weekly
- Test the slider reset speed and position accuracy every month
- If you encounter any exceptions, record them in time and communicate with the technical team to handle them
Conclusion
Although the slider system of the refrigerator foaming mold is a local mechanism, it is a key link to ensure molding accuracy and demoulding efficiency.
The problem of the slider not resetting is often the result of multiple factors. Only by starting from the mechanical, electrical and hydraulic systems, systematic inspection and timely maintenance can the foaming mold be ensured to operate stably in the long term and escort high-quality refrigerator products.
If you encounter a slider failure during mold operation, please contact our technical support and we will provide customized solutions and on-site diagnostic services.