In recent years, with the increase of people’s awareness of environmental protection, the development of the cleaning industry worldwide has brought huge challenges. Various cleaning technologies that are conducive to environmental protection have emerged at the historic moment. Laser cleaning technology is one of them. Laser cleaning technology refers to the process of using high-energy laser beams to irradiate the surface of the workpiece, which instantly evaporates and peels off particles, rust and coatings on the surface, thereby achieving cleanliness.
For an airport, runways are a key facility for its operations. During high-speed landing, aircraft tires are exposed to high temperatures due to frictional contact with the runway surface. This high temperature causes the rubber rubber formed by the tire’s rubber to melt instantly and adhere to the texture of the road surface. As the number of friction increases and the time passes, the road surface is caused. The thickening of the rubber layer causes the friction coefficient of the road surface to decrease, which affects the braking performance of the aircraft, especially when the road surface is wet, the viscosity of the rubber on the runway significantly reduces the friction and directly affects the safe landing of the aircraft. Therefore, major airports must clean the runway irregularly every year, and ensure that the surface friction coefficient of the road surface is not less than 0.5, so as to avoid accidents.
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At present, the commonly used degumming equipment in the industry includes ground milling machines and mobile shot blasting machines.
》》 Degumming of the ground milling machine will cause damage to the surface of the runway;
》》 The shot blasting machine may remove steel shots on the runway. If it is not cleaned in time, it will cause damage to the aircraft and increase the workload of the workers.
In the actual cleaning of the runway, different energy and moving speed should be adopted according to the actual thickness of the “rubber black”, so as to achieve better cleaning efficiency and effect.
The laser hand-held cleaning machine is professionally customized for airport runway degumming. It can not only effectively remove the tire rubber layer on the aircraft runway, but also not cause any damage to the airport runway. It is both energy-saving and environmentally friendly. It is the first choice for cleaning aircraft runways. device. After degumming, the runway friction resistance value has fully reached the required standard after testing, improving the quality of the runway surface and ensuring the normal takeoff and landing of the flight.
In order to test the practical application effect of laser cleaning on the airfield runway rubber, we used a Ruike 500W pulse fiber laser for experiments. This laser has a wavelength of 1064nm, a pulse width of 130-160ns, a repetition frequency of 20-50kHz, and a laser core diameter. It is 200, and the single pulse energy is 25mJ. In the experiment, a cleaning speed of 20 mm / s was selected, and the rubber was cleaned under each energy condition by a direct radiation method. The final experiment was successful.
↓↓↓ Before cleaning
↑↑↑ After cleaning
Contrast effect before and after cleaning
After inference of experimental data, the cleaning efficiency has a great relationship with the laser energy density. When the laser energy density is very small, the laser has no obvious effect on the surface of the rubber layer. When the laser energy density increases continuously, the surface of the rubber layer begins to be traced by the laser cleaning, but the cleaning rate is low. When the laser energy density reaches a certain value At this time, the cleaning efficiency will reach 100%, and the surface of the substrate is intact. When the laser energy density is further increased, although the full cleaning is achieved, the surface of the substrate will be ablated under the microscope. When the spot is unchanged, the laser single pulse energy is proportional to the laser energy density, so the relationship between the laser single pulse energy and the cleaning efficiency is given here.
Relationship between cleaning efficiency and single pulse energy
In addition, we also tested the change of different rubber thickness with laser cleaning efficiency:
As can be seen from the chart above, as the coating thickness increases, the cleaning efficiency will become slower.
By using a 500W pulse laser to clean the airport runway rubber, when the process parameters are appropriate, the pulse laser can completely clean the airport runway rubber without hurting the surface of the substrate.
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Laser cleaning has a cleaning threshold and a damage threshold. Between the initial cleaning threshold and the full cleaning threshold, the cleaning efficiency increases as the laser energy density increases. Between the full cleaning threshold and the damage threshold, the substrate surface cleaning rate remains 100% without any damage. The 500W high-power pulsed fiber laser launched by Ruike Laser has high average power, high single-pulse energy, uniform spot energy distribution, universal control interface, strong compatibility, adjustable operating frequency, high beam uniformity, and can fully meet the cleaning requirements. Application of airport runway rubber cleaning.