Seamless Gas Cylinder Outer Wall Shot Blasting Machine: Core Function + Advantages of Use
A. Core Function of the Gas Cylinder Outer Wall Shot Blasting Machine
The gas cylinder outer wall shot blasting machine is a dedicated shot blasting equipment with an inclined roller track design, suitable for steel seamless gas cylinders such as oxygen, acetylene, LNG, CNG, and liquefied petroleum gas. It is a standard pre-treatment equipment for gas cylinder production lines and regular inspection and refurbishment of gas cylinders.
1. Thorough surface cleaning, meeting the standard for anti-corrosion coating
Remove the oxide scale, black scale, and rolling impurities generated during stretching and heat treatment of the gas cylinder. Remove the factory rust, old bottle refurbishment of old paint, welding slag, and oil stains adhering to the surface;
After treatment, the surface cleanliness reaches Sa2.0 to Sa2.5 (National Standard GB8923), presenting a uniform metal color, with no residual impurities in any corner;
The roller track drives the gas cylinder to rotate at a constant speed + move in a straight line. Multiple shot blasting devices project at multiple angles, covering the cylinder's 360° surface, with no cleaning blind spots at the neck, shoulder, and bottom of the bottle.
2. Eliminate residual stress in the shape, enhancing the safety performance of the gas cylinder (core safety function)
Steel seamless gas cylinders have a large amount of residual tensile stress after heat stamping, stretching, and quenching. Long-term use is prone to stress corrosion cracking and fatigue cracks:
High-speed steel shot continuously impacts the cylinder wall, forming a uniform compressive stress layer on the surface, counteracting the internal residual tensile stress;
Significantly improve the fatigue limit and stress corrosion cracking resistance of the gas cylinder, extend the safe use period of the gas cylinder, and meet the safety requirements of gas cylinder pressure vessels.
3. Controllable surface roughening, strengthening coating adhesion
Shot blasting can precisely control the roughness at 40 to 75 μm, forming a uniform micro-rough surface:
Subsequent painting, plastic spraying, and anti-corrosion coating can deeply bond, eliminating peeling, detachment, and bulging;
Compared with acid washing and manual sandblasting, the durability of the coating is improved by 3 to 5 times, reducing the frequency of gas cylinder refurbishment and maintenance.
4. Surface strengthening, enhancing wear resistance and impact resistance
Steel shot impact achieves cold working strengthening of the surface, increasing the hardness of the gas cylinder outer wall layer, enhancing the wear resistance, impact resistance, and rust resistance during transportation, loading and unloading, and outdoor environments.
5. Refurbishment of old gas cylinders
During regular inspection and renewal of gas cylinders, old anti-corrosion paint and rust layers are removed at one time, restoring the metal substrate, completing the refurbishment pre-treatment, replacing manual grinding and acid washing processes.
B. Advantages of Use of the Gas Cylinder Outer Wall Shot Blasting Machine
(A) High production efficiency, suitable for batch operations on assembly lines
Continuous through-type automation: The roller track automatically feeds, transports, shot blasts, and discharges. There is no need for manual operation during the entire process. It can handle 100 to 180 gas cylinders per hour, with an efficiency that is tens of times higher than that of mobile shot blasting machines and manual shot blasting;
Seamless connection with the production line: Combined with flaw detection, water pressure testing, painting, and drying processes to form a complete gas cylinder automated production line, 24-hour continuous production is possible;
Low labor costs: The entire machine only requires 1 to 2 operators for loading and unloading, no professional shot blasting technicians are needed, significantly reducing the workforce.
(B) Stable and uniform cleaning quality, strong product consistency
The shot blasting device is designed through computer three-dimensional simulation, with standardized shot projection angles, shot flow rate, and conveying speed. There is no difference in roughness and cleanliness of each gas cylinder;
Gas cylinder rotation + multi-directional shot blasting combined action eliminates local missed blasting and uneven cleaning, solving the defect of inconsistent thickness in manual sandblasting;
Process parameters can be locked by PLC, unaffected by the operator's operational level, and stably meeting the factory quality inspection standards of pressure vessels.
(C) Lower material costs, high shot blasting material recycling rate
Fully enclosed shot blasting recovery system: Screw conveyor + bucket elevator + air separation separator, steel shot automatically screens dust, oxide scale, and broken shot, qualified steel shot is recycled and reused;
The loss is much lower than mobile shot blasting: The loss of steel shot is only 1/5 of the shot blasting machine, with no large amount of abrasive waste, and the long-term production cost of consumables decreases significantly. Broad applicability range: Steel wire cut balls, alloy steel balls, and stainless steel balls can all be used, meeting different requirements for new bottle manufacturing or old bottle refurbishment.
(D) Environmentally friendly enclosed operation, dust pollution controllable
Fully sealed abrasive blasting chamber + multi-layer wear-resistant rubber sealing door curtain, preventing steel ball splashing and dust leakage, no dust flying around in the workshop;
Equipped with pulse bag dust removal system, dust emission ≤ 50mg/m³, in line with environmental protection environmental assessment requirements, compared to pickling there is no wastewater or chemical waste liquid pollution;
Solid waste is only oxide dust, centralized collection and treatment, no hazardous waste disposal costs, lower environmental investment.
(E) Equipment durable and easy to maintain, long service life
The inner lining of the abrasive blasting chamber is all made of high manganese Mn13 wear-resistant protective plates, resistant to high-speed ball impact, and the service life of the lining plate can reach tens of thousands of hours; the abrasive blasting blades and impeller wear parts can be replaced conveniently, and maintenance is simple;
The small pit / shallow pit design, no need to dig deep foundation, convenient for equipment installation, maintenance, and clearing accumulated balls; the loading and unloading position is highly user-friendly, reducing the labor intensity of workers when moving gas cylinders;
The entire machine has safety interlock protection, the maintenance door and the abrasive blasting compartment door opening and closing will automatically stop the machine to avoid the risk of ball injury, and the production safety is high.
(F) Differentiation advantages compared to pickling
No acid or alkali wastewater, no corrosion, no hydrogen embrittlement risk (hydrogen embrittlement will significantly reduce the pressure safety of gas cylinders);
No need for wastewater treatment equipment, no chemical agent procurement, and no waste liquid disposal costs;
It has the effect of stress elimination and strengthening, pickling can only remove rust, but cannot improve the mechanical properties of gas cylinders.
(G) Strong versatility, suitable for multiple specifications of gas cylinders
By adjusting the roller spacing, conveying speed, and abrasive blasting power, different diameter and length seamless gas cylinders can be processed: civilian liquefied gas steel cylinders, industrial oxygen cylinders, hydrogen cylinders, and vehicle-mounted CNG high-pressure gas cylinders can all be used universally, one machine for multiple purposes.
C. Applicable scenarios of gas cylinder outer wall abrasive blasting machine
Seamless gas cylinder manufacturing factory: Pre-treatment before coating after new bottle formation;
Gas cylinder inspection station, refurbishment factory: Rust removal and paint removal for expired gas cylinders for refurbishment;
Surface strengthening treatment of high-pressure special gas cylinders (hydrogen storage, vehicle-mounted LNG cylinder).