The Overlooked Industrial Blind Spot: Who Is Stealing the Lifespan of Construction Machinery?

The Overlooked Industrial Blind Spot: Who Is Stealing the Lifespan of Construction Machinery?

Ozone Micro-Nano Bubble Technology for Cleaning Mechanical Components

With the steady growth of the global economy, construction machinery components play a significant role in numerous fields such as production, construction, and transportation. The manufacturing level of mechanical parts directly reflects a country's industrial capability and technological advancement, while proper cleaning and maintenance of these parts can significantly extend the overall service life of machinery and reduce operating costs.

Inside construction machinery, certain components become contaminated by fuel after prolonged operation. The main contaminants are oil污 formed by a mixture of lubricants and metal debris, as well as carbon deposits resulting from incomplete fuel combustion. Oil primarily accumulates within fuel delivery passages, significantly affecting filtration systems and pipelines; carbon deposits mainly form in the combustion chamber and surrounding areas, noticeably reducing chamber volume and impairing piston performance. These two types of contaminants are also typical pollutants encountered during mechanical cleaning and maintenance. Studying effective methods for removing these contaminants is of great significance to the development of the machinery industry.

In the current engineering field, commonly used cleaning methods include high-pressure water jet cleaning, chemical cleaning, and ultrasonic cleaning. However, these methods have drawbacks such as high equipment costs, demanding operational requirements, high energy consumption, incomplete cleaning of component crevices, excessive noise, and a tendency to cause secondary pollution.

Considering these factors, modern industry urgently needs a new cleaning method that is flexible, environmentally friendly, low-noise, minimally damaging to material surfaces, and capable of reducing costs as much as possible. With the continuous advancement of micro- and nano-bubble technology, large-scale industrial applications of micro- and nano-bubble cleaning are gradually transitioning from concept to reality.

As a novel green cleaning technology, micro- and nano-bubbles have demonstrated high-efficiency cleaning performance across various fields. For example, using micro- and nano-bubbles to remediate oil-contaminated soil has proven highly effective, achieving separation rates exceeding 70%.

Using air micro-nano bubbles to clean oil-contaminated fine sand, a combined method of mechanical stirring and micro-nano bubbles achieved a maximum oil removal efficiency of 95%. Additionally, some researchers have combined large bubbles with micro-nano bubbles for flotation to remove oil from contaminated sand. Results showed that the addition of micro-nano bubbles shortened the attachment time between large bubbles and the oil layer, significantly increasing the oil removal rate to 68.6%.

Micro- and nano-bubbles effectively remove oil contamination from engineering components primarily due to their enormous total surface area—approximately one billion bubbles per milliliter—which significantly increases the probability of adhesion between bubbles and pollutants. When these micro- and nano-bubbles attach to oil stains and surfaces, they move across the specimen's surface and coalesce into larger bubbles. These larger bubbles then rupture or detach from the surface due to water flow, thereby separating the oil contaminants from the specimen. Additionally, since micro- and nano-bubbles are less dense than the surrounding liquid, they can carry oil particles to the surface through buoyancy-driven flotation.

Due to their tendency to bind with hydrophobic pollutants in water, micro- and nano-bubbles can adsorb oil stains and other impurities on solid surfaces. After oil molecules slowly adhere to the bubble surface, the self-contracting microbubbles bridge the oil droplets, forming an oil film on the bubble surface, which facilitates separation of the oil from the solid surface. Additionally, the shock waves and liquid jets generated by the collapse of numerous tiny bubbles deliver frequent, high-frequency minor impacts onto object surfaces, effectively weakening the adhesion forces between contaminants and the solid surface, thereby detaching and removing viscous pollutants.