Marking machine red light indication and chiller selection

The main energy source of the laser marking machine is to collect high-tech photoelectric energy from itself, and then combine the energy. The main work is to mark metal objects. At present, the laser marking machine has a The advanced nature has completely replaced the traditional marking device. Today, laser technology has become one of the four major scientific and technological inventions in my country. The performance advantage of marking machine technology in the processing of materials and the development of the industry is particularly prominent, and has been favored by many businesses. people.

The main purpose of laser marking machine is to work by laser, and the red light indicator function needs to be used in the working process. At present, most of the laser instruments produced in China do not have red light output, so It will bring inconvenience to the work, so how to set the red light for the laser marking machine, only two parts are needed, the 45-degree beam combiner and the fixed frame of the beam combiner.

The 45-degree beam combiner can pass more than 99.9% of the 1000-1100nm laser light at a slope of 45 degrees, and about 60% of the reflected light reaches 500-800NM, while The main function of the fixing frame is to adjust the position of the red light. The laser marking machine makes it electrically insulated from the casing to achieve a good fixing effect. Just set the above components for the laser marking machine, and the output can be very good. Red light, simple steps, bring good benefits, provide fast and accurate positioning effect for the marking machine, this is the main function of red light.

1. Cooling capacity.

As the name implies, it is the cooling capacity of the laser chiller, which is the first indicator for the selection of the laser chiller.

We can calculate the heat generated by the laser marking machine according to the photoelectric conversion efficiency of the laser marking machine, and choose a pair.

P heat u003d P laser/μ.

Assuming that the thermal efficiency μ of the CO2 laser marking machine is generally 15%, the 80W laser needs less: 80/0.15u003d533W.

That is to say, while the 80W laser is generated, the laser injects 533W of energy, and the excess energy needs to be taken away by the laser chiller.

We directly determine the cooling capacity of the laser chiller based on the input rated power of the laser power supply minus the output power of the laser.

For example, our commonly used RF lasers and solid-state lasers will be marked with the power supply voltage and current of the rated full power of the UV laser marking machine. Taking the coherent 70W RF laser as an example, its requirements The power input is 48V25A, the instantaneous 36A, and the input power can be calculated as the largest 1200W.

2. Yang Cheng pressure and water speed flow of the pump.

Everyone pays attention to the cooling capacity of the laser chiller, and often ignores the indicator of the pump Yang Cheng. The cooling capacity represents the cooling capacity provided by the compressor, and the water flow represents the chiller. The ability to take away heat leads to the phenomenon that everyone often sees: a chiller with a nominal cooling capacity of 1000W is connected to an 80W glass tube, the chiller shows 25°C, but the laser tube is very hot, this is because the pump The process pressure is not high, the water flow does not have enough pressure to promote the water circulation, and the heat is not taken away.

3. Water filter and water quality requirements and inner water tank material.

This comprehensive indicator is often ignored, but it is very reused and directly affects the life of the laser.

For CO2 glass tube lasers, the mirrors at both ends belong to the dead corners of the water flow, and it is easy to retain impurities in the water. The micro-deformation directly affects the output beam quality and spot pattern of the laser.

For RF lasers, the accumulation of impurities such as scale and patina on the heat sink will cause the electrode plate to deform due to excessive temperature in the cavity, and then the temperature sensor will alarm and the laser will not emit light. .

For YAG lasers, the surface cleanliness of the pump lamp, crystal and gold-plated cavity directly affects the output light power and spot mode, and the blockage of tiny water holes in the semiconductor module will directly burn out bar.

Most of the chiller refrigerant tubes on the market use copper tubes, and the evaporation plate is directly placed in the cooling water, which will produce a lot of patina, which will directly affect the laser.

Many filterless chillers directly add tap water or use pure water that is not replaced for a long time, which will cause the breeding of bacteria and impurities to deposit on the laser and affect the life of the laser. and use effects.

Therefore, we must regularly check the water quality in the water tank, replace the water source and clean the water tank regularly, keep the waterway smooth and clean, and equip the water tank with a water filter to filter impurities in the water .

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