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Shot blasting cleaning machine for the inner wall of shell shells
Shell inner wall cleaning machine
The shot blasting machine for the inner wall of shell casings is an automated device specifically engineered to remove residues, oxide layers, and rust from the internal surfaces of such casings. Its core operation involves achieving surface cleaning and strengthening through the high-speed impact of abrasive media, such as steel shot or ceramic shot.
Detailed Explanation of the Main Components and Functions of the Shell Inner and Outer Wall Cleaning Machine
1. Projectile Circulation System
Shot Storage and Supply Device
Function: Stores abrasive media (e.g., stainless steel shot, cast steel shot) and supplies it quantitatively to the shot blasting unit via a controllable valve or conveying system, ensuring consistent injection pressure.
Shot Recovery Device
Function: Collects used abrasive media through screw conveyors, bucket elevators, or pneumatic recovery systems and returns them to the storage unit, forming a closed-loop circulation system to minimize material loss.
Shot Sorting and Purification Device
Function: Utilizes vibrating screens and air classifiers to separate broken pellets, dust, and impurities, ensuring the integrity of the abrasive media and maintaining cleaning efficiency.
2. Shot Blasting System
Inner Wall Shot Blasting Device
Outer Wall Shot Blasting Device
Function: Accelerates the abrasive media to high velocities (60–100 m/s) using centrifugal wheels or compressed air nozzles and directs them onto both the inner and outer surfaces of the shell casing, ensuring full surface coverage.
Multi-Angle Nozzle Adjustment Mechanism
Function: Adjusts the spray angle via mechanical arms or rotating nozzles to ensure thorough cleaning of complex inner wall structures, such as threads and grooves, eliminating blind spots.
3. Shell Positioning and Conveying System
Automatic Clamping and Rotation Mechanism
Function: Secures the shell casing using hydraulic or pneumatic fixtures and rotates it around its axis via a motor, ensuring uniform exposure of the inner wall to the shot blasting process.
Conveyor Line (Chain Type/Roller Conveyor)
Function: Automatically transports shell casings into and out of the working station, linking loading and unloading processes and enabling integration into automated production lines.
4. Dust Removal and Environmental Protection System
High-Efficiency Dust Collector (Bag/Cartridge Type)
Function: Captures metal dust and debris generated during the shot blasting process, ensuring emissions meet environmental protection standards (e.g., PM10 = 20 mg/m3).
Noise Isolation Cover
Function: Reduces operational noise levels (typically below 85 dB), thereby improving the overall working environment.
5. Control System
PLC/HMI Control Center
Function: Allows users to set parameters such as shot blasting time, pressure, and abrasive flow rate. It also monitors equipment status (e.g., shot level, motor temperature) and supports fault diagnostics and alarms.
Automated Sensing System
Function: Detects the position and cleaning status of the shell casing using photoelectric or pressure sensors, enabling adaptive adjustments during operation.
6. Auxiliary Systems
Lubrication and Cooling Device
Function: Provides lubrication and cooling for critical components such as bearings in the shot blasting unit, thereby extending equipment service life.
Safety Interlock Device
Function: Includes access control switches and emergency stop buttons to ensure equipment shutdown during maintenance and prevent accidental operation.
Typical Workflow
The shell casing is automatically fed into the system ? positioned and clamped ? rotated into the shot blasting chamber.
High-pressure abrasive media is sprayed onto the inner wall while the circulation system simultaneously recovers, sorts, and replenishes the media.
Upon completion of the cleaning process, the abrasive media ceases to be ejected, the casing is retracted, and the cleaned shell is automatically discharged.
Throughout the process, the dust removal system remains operational to maintain a clean working environment.
Technical Features of the Shot Blasting Cleaning Machine for Shell Inner Walls
Military-Grade Precision: Capable of cleaning deep inner walls with a depth-to-diameter ratio exceeding 10, achieving a surface roughness of Ra = 1.6 µm.
Material Adaptability: Compatible with various materials, including steel and aluminum alloy casings.
Strengthening Effect: The shot peening process enhances the fatigue strength of the inner wall by inducing compressive residual stresses exceeding -200 MPa.
Such equipment is widely employed in military and aerospace applications and must conform to relevant military standards, such as GJB 150A-2009.link:https://www.shotblastingasia.com/sandblasting-machine/shell-cleaning-machine.html