The Principle of Lubricating Oil Pump in injection molding machine involves circulating oil to reduce friction in injection molding machines.
During the operation of the injection molding machine, the lubrication pump really plays a key role.
It continuously delivers lubricant to the mechanical parts, directly reducing the friction loss between the parts, effectively preventing the equipment from overheating, making the equipment run more smoothly, and significantly extending the service life of the machine.
This article will explain in detail the working principle of the injection molding machine lubrication pump and explain why it is so important to maintain the stable operation of the equipment.
Principle of Lubricating Oil Pump
Understanding the principle of the lubricating oil pump is essential for operators and maintenance personnel to ensure the longevity and reliability of the injection molding machine.
- Function of the Lubricating Oil Pump
- How the Lubricating Oil Pump Works
- Types of Lubricating Oil Pumps
- Importance of Regular Maintenance
Function of the Lubricating Oil Pump
The core function of the lubrication pump is to deliver lubricating oil to various moving parts of the injection molding machine, including the injection unit, clamping unit and other key parts.
Through continuous oil supply, it can effectively reduce the friction loss between parts and avoid wear of the equipment due to direct contact.
This stable lubrication mechanism ensures the long-term smooth operation of the equipment, reduces the risk of sudden failures, and prolongs the service life of the entire machine.
How the Lubricating Oil Pump Works
The lubrication pump draws lubricating oil from the oil tank and delivers the oil to the parts that need lubrication through the pipeline.
Different injection molding machines have different designs and drive methods: some use electric motors, while others use hydraulic systems to drive the oil pump.
After the oil pump pressurizes the lubricating oil, the oil can flow steadily to each part that needs lubrication, so that all key parts can be continuously lubricated and protected when the machine is running.
Types of Lubricating Oil Pumps
When choosing a lubricating oil pump for your injection molding machine, you will encounter several common types. Knowing their characteristics can help you make a more appropriate choice:
Gear Pump
This pump delivers lubricating oil through the meshing movement of two gears. Its simple and straightforward structure makes daily maintenance relatively easy, and you will appreciate its stable performance. It is a reliable choice worth considering in scenarios that require long-term continuous operation.
Vane Pump
You can see it pushing the oil through the telescopic vanes in the pump housing. This design allows it to maintain high working efficiency while also withstanding the high pressure requirements of your equipment. In actual use, it usually has a longer life than a gear pump, which can reduce your downtime maintenance frequency.
Piston Pump
If your injection molding machine is a large equipment, this pump is worth paying attention to. It relies on the reciprocating motion of the plunger to generate power, can continuously provide a large flow of lubricating oil, and can work stably even in high-pressure environments. You will find that it performs particularly well in the lubrication system of heavy equipment.
Importance of Regular Maintenance
Want to keep the lubrication pump running stably? Remember three key actions:
- Check the oil level: Open the oil dipstick every week to confirm whether the lubricating oil is in the middle of the scale line. If it is below the lowest line, immediately add the same type of lubricating oil (ISO VG46 grade is recommended).
- Clean the filter: Remove the filter screen every month, rinse the metal filter element with kerosene, and replace it immediately if deformation or holes are found.
- Comprehensive inspection: Stop the machine every quarter to check the bearing temperature (it is better to touch the pump housing without hot hands, recommended ≤75℃), whether the seal ring is leaking oil, and whether the bolts are loose.
Adhere to these operations, the life of the equipment can be extended by more than 30%, and the production line interruption caused by sudden shutdown can be avoided. When encountering abnormal noise, remember to cut off the power supply before checking.
Selection and maintenance strategy of lubrication pump
Selection guide
| Equipment scale | Recommended pump type | Distributor type |
| Small injection molding machine | Electric gear pump | Impedance type |
| Medium injection molding machine | Pneumatic piston pump | Volumetric type |
| Large injection molding machine | Electric piston pump + controller | Progressive type |
Key maintenance measures
- Regular cleaning: Clean the filter and pump core every 500 hours to prevent clogging by impurities.
- Oil management: Use ISO VG 68~220 high-wear hydraulic oil to avoid mixing and causing viscosity reduction.
Fault response
- Insufficient pressure: Check for filter blockage, pressure regulating valve failure or pipeline leakage.
- Abnormal noise: Check for pump core wear or air intake problems.
HAICHEN: Injection Molding Machine Manufacturer
HAICHEN has been focusing on the R&D and manufacturing of injection molding machines for many years. We understand that every device on the production line is an important investment for customers.
Therefore, we insist on full quality control from raw material procurement to factory inspection to ensure that the equipment remains stable and reliable under long-term high-load operation.
For different production needs, we provide a variety of models with clamping force from 30 tons to 3000 tons. The standard efficient lubrication system can significantly reduce daily maintenance costs.
If the equipment needs support, our service team will respond as soon as possible – whether it is process debugging guidance, spare parts supply, or operation training, we will follow up until the problem is solved.
When you buy HAICHEN equipment, you get not only the machine, but also continuous production guarantee.
Thai factory owners are actively looking for more cost-effective injection molding solutions – they need equipment that can ensure stable part quality and control production costs.
The design quality of the injection molding machine lubrication system will significantly affect the service life of the equipment and the operating efficiency of the production line. From the flow regulation of the gear pump to the precise control of the progressive distributor, the modern lubrication system has achieved closed-loop management of power transmission, oil distribution and operation monitoring.
It is recommended that manufacturers choose the appropriate oil pump model according to the equipment scale and work intensity, and establish a management mechanism of “regular preventive maintenance + oil quality monitoring”, which is crucial to fully unleash the performance potential of the equipment.
