Introduction of plasma spraying technology
Plasma spraying is a thermal spraying method based on plasma arc as the heat source and powder material. When plasma is sprayed, a consistent flow arc is generated between the cathode and the anode (nozzle), which heats the imported working gas to ionization into high temperature plasma and spews out the nozzle to form a plasma flame.The powder is melted, accelerated, and sprayed onto the substrate material by sending powder gas into the flame to form a coating. Working gases can be argon, nitrogen, or hydrogen can be added to these gases, or a mixture of argon and helium can be used. Plasma spraying be able to spray a wide range of spray materials, especially hard-to-melt materials with high melting points, such as hard-to-melt metals, ceramics, metal ceramics and other special functional materials.
Main components of plasma painting system includes intelligent control system, gas safety center, transfer box, thermal spray gun, main power supply, intelligent powder feeder and cooling system.
Control system
Man-machine interface intelligent control system, the use of current high-tech, automatic control of the entire spraying system, plasma spraying system with foreign similar products advanced level, superior performance, easy to operate, control cabinet using PLC touch control terminal, set operation, set, help, display, process and fault monitoring in one place, simplified panel design, easy to use, simple and intuitive operation.
Gas Safety Controller
H2 is flammable and explosive dangerous gas, the use of mass flow meter is electrical components, generating electric sparks will have the risk of combustion and explosion, so our special manufacturing and research and development of independent “water and electric safety center” for the use of equipment to provide safety and security functions
Specifications:
- Three gas (H2, N2, Ar2) leak detection systems.
- gas leakage alarm device.
- quickly cut off the intake pipe.
- spray gun fire prevention, extinguishing device.
- leakage protection, cut off and alarm device.F, current overload protection device.
- voltage over load protection device.
- water leakage pressure sensor device.
- water temperature ultra-high warning, shut down the system.
- dust concentration monitoring alarm and shutdown device.
Plasma Transfer box
A transfer center of the entire spray system, which connects the power supply – control cabinet – heat exchanger – spray gun together. The box is equipped with a high frequency ignition water way air alarm. The case is removable and the water cable length is 5m (standard).
Mix the hydropower of the plasma equipment and deliver it to the spray gun, while providing the high frequency pulse voltage required for the gun to arc and detect the return water temperature and cooling water pressure of the spray gun, which is lightweight and flexible and easy to drag.The arcing performance is good, reducing the instantaneous current shock when the nozzle arcs.
Plasma spray gun
The main gas is argon or nitrogen, the auxiliary gas is hydrogen
Operation current: 100~800A
Operation voltage: Ar+H2 for 50~75V N2, H2 for 50~80V. The gun offers the following accessories: spray-powder feed and cooling air injection rack – water
cable – electrode head – insulation Body – sealing ring – special tools, etc
AFX-80 Spray gun is used in production-type thermal spray operations, its maximum output power of 80KW, this gun is highly rated, so in the production environment can use high powder rating, shorten spray time, reduce processing costs.The standard structure allows for rapid hardware replacement.A variety of nozzles-electrodes and powder vents are available to suit the requirements of different materials
Power supply device
SCR rectifier, maximum input power 85KW, interim load rate of 100%;The maximum output power of 80KW, under the condition that the grid fluctuates ± 15%, can work normally, the current fluctuation range: ±1 to ±2%.
To provide DC power supply for spray gun, intelligent module control, the use of modular rectifier, soft arcing, can work 24 hours without fault; It’s currently the best plasma power supply on the market.
Smart powder feeder
Powder system advantages:
1- Using PLC and touch screen setting parameters, precise control of powder delivery accuracy and powder delivery speed.
2- system consists of two separate powder feed units with a large tank capacity of 20 liters and a scraper-type conventional powder feed at a speed of 150 g/min.Small cans use drum feed powder, suitable for sending a variety of ultra-fine powder and difficult to send mixed powder.
3- The use of fully enclosed plastic steel chassis, not subject to external temperature, humidity and other environmental interference, panel transparent glass door, Powder delivery status at a glance.
4- can choose the distribution powder vibration device – powder tank powder heating device and metering weighing device.
Heat exchanger(cooling system)
AFX-80 Heat exchanger, also known as chiller or water chiller. We use double motors compressor to make this machine smaller and save space for our customer. The spray gun is cooled down by water, and we use heat exchanger to cool down the high temperature water coming from spray gun, and then use these cooled water to cool down the spray gun again. In this way the spray gun can keep a normal working temperature and prolong the usage life of spray nozzle.
Measurement and control temperature range -4.9 degrees C- 94.9 degrees C, display resolution of 0.1 degrees, control sensitivity of 0.1 degrees C, offset range of -0.5 degrees C-10 degrees C, the use of AC220V power input voltage, instrument environment: relative humidity≤90%RH, temperature at 0-45 degrees C non-corrosive and waterproof environment.
