Tips for using shot peening tanks
Shot blasting (sandblasting) tanks are key equipment in surface treatment. Correct use can ensure efficiency, quality and safety. Here we have sorted out for you the complete set of usage tips from preparation, operation to maintenance.
Core principle: Safety first
Shot peening operations generate a large amount of dust, noise and rebound materials, and proper protection measures must be taken.
Personal protective equipment (PPE) : Wear a pressurized air-supplied dust mask (ordinary masks must not be used as substitutes), anti-crush and anti-puncture safety shoes, anti-abrasion and anti-puncture gloves (shot blasting gloves), protective clothing or leather aprons, earplugs or earmuffs.
Environmental isolation: Work in a closed shot blasting room or with dust-proof curtains to ensure the normal operation of the ventilation and dust removal system.
Sandblasting tank inspection: A safety check must be carried out before each use.
Detailed explanation of usage tips
I. Preparations Before Sandblasting Tank Operation
Five-step Method for Sandblasting tank inspection
Pipelines and joints: Inspect the air hose, sandblasting pipe, and all joints for wear, leakage, or looseness.
Tank body and seal: Check the tank body for any cracks and confirm that the sealing rings (especially those on the bottom cover) are intact, clean and installed correctly. This is the key to preventing air and sand leakage.
Valves and controllers: Check whether the exhaust valve, intake valve and sand discharge valve operate flexibly. Check whether the remote control (if any) is working properly.
Nozzle: Check the wear condition of the nozzle. Severe wear (enlarged inner holes or out-of-roundness) will significantly reduce cleaning efficiency and air pressure. It should usually be replaced when it wears down to 1.5 times the original hole diameter.
Abrasive: Use dry, clean and appropriately sized abrasives (such as steel shot, glass beads, brown corundum, etc.). Damp abrasives can cause clogging and hardening.
Correct loading and pressurization
Turn off the gas source: Ensure that the main intake valve is in the closed position.
Safety pressure relief: Open the exhaust valve to release the residual pressure in the sandblasting tank.
Loading: Open the feeding cover and load the abrasive to 70%-80% of the rated capacity (leaving space for compressed air). After loading, make sure the sealing cover is tightened correctly.
Establish pressure: First, close the exhaust valve, then slowly open the main intake valve to gradually increase the pressure inside the tank to the working pressure.
Ii. Operations during the assignment
Maintain the best Angle and distance
Angle: For rust removal and paint removal, the Angle between the nozzle and the working surface is preferably 70° to 80°. For reinforcement, it should be carried out in accordance with the process requirements (usually close to vertical).
Distance: Usually kept at 15 to 30 centimeters. Too close can easily damage the substrate and nozzle, while too far will result in low efficiency. Keep moving at a constant speed to avoid over-spraying or insufficient cleaning in certain areas.
Pressure and Flow control
Adjust the pressure to the appropriate level according to the material of the workpiece, the type of abrasive and the cleaning requirements. It's not the case that the higher the pressure, the better. The rebound caused by excessive pressure will be more severe.
The abrasive flow rate can be controlled through the remote control or the sand discharge valve to achieve a uniform cleaning effect.
Clogging prevention tips
Always keep the abrasive dry.
If the sandblasting tank suddenly stops discharging sand during operation, first close the sand discharge valve, then slightly shake the sandblasting pipe or gently tap the tank body to try to disperse the possible "sand bridge" formed.
If it is ineffective, then check after depressurizing according to the safety procedure.
Real-time observation
Pay attention to observing the cleaning effect and the dust situation. Poor performance may be due to nozzle wear, insufficient pressure or unclean abrasive.
Listen for the sound of the device. Abnormal noise may indicate a gas leak or internal component failure.
Iii. Post-operation Maintenance
Safe pressure relief and tank cleaning
After the operation is completed, first close the sand discharge valve and the main air intake valve.
Open the exhaust valve to completely release all the pressure inside the tank (reset the pressure gauge to zero).
After confirming that there is no pressure, open the feeding cover and clean the residual abrasive and dust inside the tank. It is particularly important to empty the abrasive in damp weather.
Cleaning and maintenance
Clean the filter screen, sealing surface and vent holes.
Check the wear condition of all vulnerable parts (nozzles, sealing rings, sandblasting pipes) and replace them in time.
Store the equipment in a dry and clean environment.
Record
Record the usage time of the sandblasting tank and the status of the replaced parts to facilitate predictive maintenance.
Advanced skills and advice
Abrasive selection: Choose the appropriate type and particle size of abrasive based on the material of the workpiece (aluminum, steel, composite material) and the required surface roughness (Sa value).
Nozzle selection: Venturi type nozzles are more efficient than straight hole type ones. Boron carbide/tungsten carbide nozzles have a much longer lifespan than ceramic nozzles, but they are also more expensive.
Teamwork: When working in large confined Spaces, it is necessary to work in pairs and supervise each other.
Environmental protection and recycling: When conditions permit, an abrasive recycling and sorting system should be configured to recycle abrasives, reducing costs and minimizing dust.
Summary: The efficient and safe use of shot blasting tanks hinges on "careful preparation, standardized operation and strict maintenance". Only by always prioritizing safety and strictly following the operating procedures of the sandblasting tank can we ensure the smooth progress of the work and achieve the desired surface treatment effect. For specific models of equipment, please be sure to refer to its official operation manual.