October 15, 2025
In the operation of a blow molding machine, there's an often overlooked yet crucial component: the servo hydraulic pump. While not as visible as the machine body or mold, it directly impacts the machine's precision, energy consumption, and stability. For companies striving for efficient production, choosing and utilizing the right servo hydraulic pump can save you significant time and money. Today, let's discuss the servo hydraulic pump in simple terms.
I. What does the servo hydraulic pump do? It has three core functions.
Simply put, the servo hydraulic pump is a small system that provides precise energy to the blow molding machine, primarily responsible for providing stable hydraulic power for the machine's key movements. Its core functions focus on three key areas:
(1) Controlling the mold closing action: ensuring a stable, precise, and light mold
When closing the mold in a blow molding machine, the mold must be precisely aligned and held with just the right amount of force—too loose will result in plastic leakage, while too tight will damage the mold or waste power. The servo oil source precisely adjusts the mold closing pressure and speed based on product requirements. For example, when making small bottles, the mold needs to be closed gently and quickly to avoid damaging the thin parison. When making large barrels, the mold needs to be closed firmly and forcefully to ensure a tight fit. This significantly reduces mold closing errors and extends mold life.
(2) Adjusting Parison Wall Thickness: Ensuring "Uniform Thickness" in Products
To ensure uniform wall thickness in blown products (for example, preventing thin, easily broken areas in mineral water bottles and thick, wasteful areas in others), a parison wall thickness controller is essential. The servo oil source is the "power source" of this controller. It quickly responds to controller commands, enabling subtle adjustments to wall thickness control components (such as the needle valve), even as small as 0.1 mm. This ensures more uniform parison wall thickness, naturally reducing scrap rates in subsequent products.
(3) Assisted Demolding: Ensuring a Smooth Product Release
After a finished product is finished, removing it from the mold (demolding) requires skill—too much force can damage the product, while too little can cause it to get stuck. A servo-type small oil source can work with the demolding mechanism to adjust the force and speed of demolding based on the size and shape of the product: smaller bottles can be demolded more gently and quickly, while larger barrels can be demolded more steadily and with slightly greater force. This ensures that the product emerges intact, eliminating the need for repeated manual adjustments.
II. What are the advantages of a servo-type small oil source compared to a conventional oil source? Three Core Advantages
Many older blow molding machines use conventional oil sources, but more and more companies are choosing servo oil sources. This is primarily due to their three unmatched advantages over conventional oil sources:
(1) More Energy Efficient: Long-term use can significantly reduce electricity costs.
With conventional oil sources, the motor typically runs at a fixed speed regardless of the machine's power requirements. Even low power requirements waste electricity. Servo oil sources, on the other hand, deliver power on demand—when high power is needed, the motor runs faster; when low power is needed, the motor runs slower or even stops. For example, during production breaks or when making small products, a servo oil source can significantly reduce the motor speed, saving 10%-20% of electricity daily. This translates to significant savings in electricity bills over time.
(2) More Precision: More Stable Product Quality
Ordinary oil-based motors lack precise pressure and speed regulation, which can easily lead to problems like inaccurate mold closing and uneven wall thickness. Servo-based miniature oil-based motors, equipped with a servo motor and precise control system, can maintain pressure regulation within ±0.1 MPa and smoother speed adjustment. Whether closing the mold, adjusting wall thickness, or demolding, movements are more precise, naturally resulting in higher product quality stability and less frequent rework and repair.
(3) More Durable: Fewer Failures and Less Maintenance
Ordinary oil-based motors operate at high speeds for extended periods, causing rapid wear and susceptibility to failure. Servo-based miniature oil-based motors operate mostly at low loads, resulting in less wear. Furthermore, their fuel tanks, filters, and other components are more optimally designed, resulting in less oil contamination and a failure rate over 30% lower than ordinary oil-based motors. Even if maintenance is necessary, it's usually a simple filter change or oil level check, eliminating the need for frequent overhauls and preventing production interruptions.
III. Choosing a Servo Small Oil Source: Focus on Two Key Points to Avoid Pitfalls
If your blow molding machine needs a replacement servo small oil source, or you're buying a new machine with one, focus on these two points:
(1) Compatibility: Matching the machine and product
Different blow molding machine sizes and product types require different servo small oil source power levels. For example, a small blow molding machine producing small bottles can easily choose a low-power servo small oil source without spending a fortune on a high-power one. Large blow molding machines producing large barrels require a machine with sufficient power, otherwise insufficient power will affect production. When choosing, clearly state your machine model and intended product to the manufacturer and ask them to recommend a suitable model.
(2) Stability: Choose a reliable brand and service
Although a servo small oil source is small, the quality of its core components (such as the servo motor and controller) is crucial. Poor parts can easily cause failures, delaying production. It's recommended to choose a reputable brand and pay attention to the manufacturer's after-sales service—for example, whether they offer installation and commissioning, easy access to parts, and quick on-site repairs in the event of a malfunction. Our partner, the servo oil source supplier, not only guarantees the quality of its parts but also offers one year of free maintenance and 24-hour online response for any issues.
IV. Daily Maintenance: Three Small Steps to Extend the Life of Your Servo Oil Source
While servo oil sources don't require frequent overhauls, simple daily maintenance is essential. By following these three steps, you can expect 5-8 years of reliable service:
(1) Daily: Check the Oil Level and Oil Color
Before starting the machine, take a minute to check the oil level in the servo oil source's tank. If it's below the mark, add dedicated hydraulic oil (do not mix different types of oil). Also, check the oil's color. If it's clear and translucent, it's fine. If it's cloudy or black, it's contaminated and needs to be replaced.
(2) Monthly: Clean the filter and check the pipes
Spend 10 minutes each month removing the oil source filter and blowing out any dust with compressed air (if the filter is extremely dirty, replace it immediately). Also, check the connected pipes for leaks and any signs of aging or cracking. Address any issues promptly to prevent leaks from affecting power.
(3) Semi-annually: Change the hydraulic oil and check the motor
Completely change the hydraulic oil and clean the inside of the oil tank every six months. Also, check the servo motor wiring for looseness and any unusual noises during operation. If any anomalies are detected, contact the manufacturer for repair. Don't force the machine to operate, as this can lead to minor problems becoming major failures.
Finally, a word of caution:
Although the servo oil source may be a "small component" of a blow molding machine, it significantly impacts production efficiency, product quality, and cost control. If your blow molding machine is still using a standard oil source, or your servo oil source is frequently malfunctioning, you might consider upgrading or replacing it. While it might cost a little more in the short term, the long-term savings in electricity, reduced scrap, and reduced machine maintenance time will more than pay for itself.
If you'd like to learn more about servo oil source models compatible with your blow molding machine, or have maintenance questions, please contact us. We'll provide personalized advice and service tailored to your machine and production needs.
