What is sand blasting Machine
Sandblasting is a way of smoothing and cleaning a hard surface by forcing solid particles on the surface of the workpiece at high speeds by using compressed air from the air compressor.
With aggressive blasting, the sand moved against a surface. With shot blasting, on the other hand, small metal balls or beads are propelled or moved against a texture. The beads are often made of stainless steel, copper, aluminum, or zinc. In this case, all of these metals are harder than sand, making shot blasting even more effective than its aggressive blasting equivalent.
PORTABLE ABRASIVE BLASTING
Portable Abrasive Blasting Machineis a machine that can be movable from one place to another and blasting work can be done easily.
Pressure blasting is also called a portable machine. A pressure blasting cabinet uses a pressurized vessel (portable machine) filled with abrasive media, which is then forced through the blast nozzle.
Standard types of Portable Abrasive Blasting Machine available are:
- Airo P7-150
- Airo P7-300
- Airo P7-500
- Airo P7-1000
Main Components of Portable Abrasive Blasting Machine:
- Air Filter
- Mushroom Ball
- Net Realizable Valve (NRV)
- Remote Control
- Pinch Valve
- Mixing Tube
- Blasting Holes
AIR FILTER – prevents impurities such as moisture, etc. from the air compressor.
MUSHROOM BALL- used for creating the pressure inside the hopper.
NET REALIZABLE VALVE – used to control the amount of air supply and also prevents air to go back.
REMOTE CONTROL – used for on/off the supply of air.
PINCH VALVE – is a two-way valve designed to shut off or control the flow of abrasives.
MIXING TUBE- where mixing of air and abrasive takes place.
BLASTING HOLES- from which the hose pipe is connecting.
BLASTING NOZZLE- is a device that accelerates the air and abrasive blasting mixture over a material’s surface that exhibits pitting and needs repair and subsequent protection from corrosion.
Types of Abrasive Used In Portable Abrasive Blasting are:
Working of Portable Abrasive Blasting:
First of all, Portable Blasting Machine is completely filled with Abrasive (garnet, glass beads, aluminum oxide, etc.) as per the requirement inside the hopper. After filling the hopper completely with the abrasive air compressor valve is opened manually. As the air starts to flow from the air compressor to the air filter where the air gets filtered and moisture is removed from it. And another supply of air is directly given to the hopper which is used to create pressure inside the hopper with the help of a mushroom ball.
Air from Air Filter flows to Remote control which is used for the purpose of ON/OFF the supply of air. As supply is ON, air continues flowing from Net Realizable Valve (NRV) which is used to control the amount of air supply and also prevents air to go back. From NRV air flows to Pinch Valve.
Pinch Valve Is a two-way valve designed to shut off or control the flow of abrasives. Abrasive from high pressure from hopper comes in pitch valve. Then comes the Mixing Tube in which the mixing of air and abrasive takes place. Hose’s one end is connected with mixing tube and another with nozzle. This mixer of air and abrasive moves with high pressure through the hose and passes from the nozzle with high pressure on the workpiece, on which blasting is to be done.
Application of Portable Abrasive Blasting Machine:
- Abrasive blasting is mostly related to cleaning painted and unpainted steel.
- Copper Slag is commonly used as an abrasive blasting in shipyards and other industries to remove paint, rust, etc.
- Nowadays abrasive blasting is used in almost every industry that uses metal, including aerospace, industries, construction, foundry, shipbuilding, rail, and many others.
Advantages of portable blasting
- The cost of the portable table is cheaper than a suction machine.
- It can easily move from one place to another where we want to use the machine and be comfortable.
The disadvantage of portable blasting
- In a Portable machine, there is more waste of media because it is an open type of blasting machine.
- A portable shot blasting machine is not more effective than suction blasting.
Mainly air operated shot blasting machines are three types
1) Pressure blasting
In Simple terms Pressure Blasting and Suction Blasting construction of the machine is the same but the difference is that only Suction Blasting consists of a Blast Gun that results in blasting whereas Pressure Blasting consists of a Pressure Pot.
2) Suction blasting
Suction Blasting is a clean, dust-free sandblaster that leaves the surface cleaned and well prepared for painting, etc after treating corrosion or unfinished surface
3) Wet blasting
- Wet Blasting Machine uses a slurry pump to draw the wet slurry of very fine abrasive and water to the blast gun where it is combined with the compressed air and propelled against the workpiece.
- Wet blasting involves high-velocity, compressed air pushes slurry directed onto a workpiece.
- The slurry is normally made of fine abrasive mixed with water.