Metal steel pipes are used for transporting liquids and gases, as well as in construction. They come in a wide range of diameters; while large-diameter pipes—large enough for a
Metal steel pipes are used for transporting liquids and gases, as well as in construction. They come in a wide range of diameters; while large-diameter pipes—large enough for a person to enter—can be cleaned using small shot-blasting machines, this method is unsuitable for narrow pipes, which are increasingly difficult to clean as their diameter decreases. Furthermore, due to the considerable length of these pipes, traditional cleaning methods often fail to achieve thorough results. Today, the team at Qingdao KEEJOO Group introduces a sandblasting machine specifically designed to clean the inner walls of narrow steel pipes.
To operate the sandblasting equipment designed for the inner walls of small-diameter steel pipes, first adjust the sandblaster's mounting bracket to match the pipe's inner diameter, ensuring it can slide smoothly inside. Next, connect the air supply and the abrasive feed hose from the sandblasting unit to the internal sandblaster, then activate both the air supply and the high-efficiency sandblasting machine. The stream of compressed air and abrasive flows into the internal sandblaster and exits through its two nozzles; simultaneously, filtered air drives a motor that rotates the nozzles, allowing for circumferential cleaning. By withdrawing the sandblaster at a steady speed during operation, the entire inner wall of the pipe is cleaned. This equipment offers rapid, efficient cleaning and is the ideal choice for treating the inner walls of small-diameter steel pipes.
Steel pipe inner wall sandblasting machine
Equipment Overview: This system employs automatic abrasive blasting to remove surface rust. A high-efficiency blaster projects a high-speed stream of abrasive media to break up and remove mill scale, rust, and debris from the steel pipe's inner surface, resulting in a refined, bright finish. This process enhances the workpiece's tensile and compressive strength and improves coating adhesion, thereby providing corrosion protection, safeguarding the pipe, and extending its service life. Post-treatment surface finish and roughness comply with relevant standards. Designed for small-diameter steel pipes, the internal shot-blasting system comprises a mobile carriage, abrasive hopper, blasting tank, blast gun, gun-carrying carriage, pipe support system, and a bottom-mounted conveying mechanism.
The internal pipe wall sandblasting machine is specialized equipment designed to meet specific process requirements for cleaning the inner surfaces of steel pipes. It features a well-conceived design and robust structure, ensuring reliable operation and high production efficiency.
The internal sandblasting machine for steel pipes is specialized equipment designed to meet specific cleaning requirements for the inner surfaces of steel pipes. Characterized by a rational design and structure, reliable operation, and high production efficiency, the machine utilizes sandblasting to remove rust, mill scale, and other contaminants from the pipe's interior, revealing the underlying metal. This process reduces internal stress, enhances coating adhesion and fracture resistance during nickel plating, improves corrosion resistance and fatigue strength, and extends the service life of the product. By optimizing the surface condition of the metal material, the machine effectively improves both the surface finish and the intrinsic quality of the workpiece.
Components of the steel pipe inner wall sandblasting machine:
The internal pipe wall shot blasting machine consists of the following components: an abrasive chamber and recovery housing, an alignment system, a shot blasting tank, a blast gun assembly, a bucket elevator, an abrasive recovery belt conveyor, a platform with hopper, ladder, and guardrails, a separator, an abrasive control system, a pipe rotation system, a lifting and conveying system, a blast gun carriage unit, a pulse dust collection system, a settling chamber, and an electrical control system.
This fully automatic internal shot-blasting system for steel pipes features a dual-purpose lifting mechanism that cuts loading time in half; it simultaneously loads untreated pipes and discharges cleaned pipes, thereby saving time and labor while significantly boosting production efficiency.
Process flow of the steel pipe inner wall sandblasting machine:
This fully automated production line cleans steel pipes. The process begins at a customer-designated storage area, where pipes are transferred from the loading rack platform and arranged sequentially in a specific position. An automatic transfer mechanism then feeds the pipes into the internal cleaning system.
Once transferred to the staging platform, the pipes are automatically positioned and fed into the internal shot-blasting equipment. A lifting trolley raises the pipe from the loading rack and moves it into the sealed cleaning chamber. Upon reaching the correct position, the pipe is lowered into the chamber, and the cleaning process begins. The sequence involves: lowering the lifting trolley; activating pipe rotation, dust collection, the vertical lift mechanism, and the internal screw conveyor; moving the shot-blasting carriage; and performing the shot-blasting operation (from front to back). After blasting, the system executes a reverse blow-off cycle to remove dust, followed by the sequential stopping of the belt conveyor, lift mechanism, dust collector, and rotation drive. The front sealing chamber then retracts.
The lifting device raises the pipe and transports it to the unloading position, where it lowers the pipe onto the discharge storage rack. An automatic transfer mechanism moves the pipe to the arrangement rack, from which it is conveyed to the painting/coating line, undergoes powder processing, and finally proceeds to the packaging area.
This machine is equipped with the HAI Ocean Surge® direct-coupled high-efficiency blast wheel (German design with independent patents, Patent No.: ZL 2015 2 0702933.5).
The blast wheel is the heart of a shot blasting machine, and its design determines the performance of the entire system. The HAI Pengpai® blast wheel comes as standard equipment, delivering superior blasting performance. Available in a variety of sizes and materials, the H-series blast wheel ensures flexibility across diverse manufacturing processes. Its key advantages include enhanced blasting performance, reduced abrasive consumption, significantly extended equipment uptime, and effective noise reduction.The casing is lined with curved, multi-layer labyrinth-style sealing plates; the hot zone features a thickness of 70mm, ensuring excellent sealing performance and a uniform distribution of the projected abrasive media over an expanded coverage area. The internal design allows for the adjustment of abrasive trajectories, thereby enhancing blasting efficiency and minimizing self-wear. Additionally, a specialized dynamic design boosts efficiency by 30% compared to standard blast wheels.
Selected Cases of KEEJOO Roller Conveyor Steel Shot Blasting Machine
245 sets of section steel shot blasting machines manufactured for Hangxiao Steel Structure Company
16 sets of section steel shot blasting machines manufactured for Hangzhou Southeast Grid
Shanghai Guandar steel profiled steel roller conveyor shot blasting machine 2 sets
9 sets of section steel shot blasting machines manufactured for China Construction Steel Structure Tianjin Company
8 sets of through-type shot blasting machines manufactured for Shanghai Baoye Steel Structure
So far, the performance of more than 600 set-type steel pass-through shot blasting machines at home and abroad is far ahead.
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A large listed domestic agricultural equipment group phased out its outdated shot blasting machines in the past two years and fully adopted hook-type shot blasting machines independently developed and manufactured by Qingdao KEEJOO Group. Up to now, the group has purchased a total of 58 units.........
The various shot blasting machines manufactured by Qingdao KEEJOO Group for European clients are highly acclaimed and well-received.!
Introduction to the Components of the Shot Blasting Machine
2. features a more compact footprint than traditional blast wheels, supports arbitrary installation angle arrangement, and enables far easier inspection and maintenance.
3. Constant blasting performance is maintained throughout operation, free from inconsistent and fluctuating cleaning quality seen on conventional units.
4. Blades and all wear-resistant consumables are manufactured in Taiwan via high-chromium investment precision casting, delivering outstanding abrasion resistance. Their service life ranges from 1,200 to 4,000 hours, 3–4 times longer than ordinary casting materials.
5. Blast wheel impeller: Treated with carburizing wear-resistant alloy. The impeller hub is one-time finished by high-precision CNC machining centers for ultra-high dimensional accuracy, ensuring perfect dynamic balance during high-speed rotation, low vibration, low noise and extended service life.
6. Equipped with SKF bearings imported from Sweden.
7. Fitted with genuine Siemens motors.
8. German Schenck dynamic balancing tester is applied to guarantee precise high-speed dynamic balance of impeller hubs.
1. Semi-automatic flow control system for regulating the flow of abrasive media into the blast wheel, featuring manual adjustment of the steel shot flow rate.
2. Fully sealed structural design, featuring a lockable inspection opening and equipped with two bearings.
3. A manual shut-off valve is installed above each flow valve; this can be closed to stop the flow of media from the hopper, thereby facilitating maintenance of the flow valve.
1. The shot blasting chamber is constructed from welded manganese steel.
2. Manganese steel protective plates are installed in the "hot zone" of the chamber—specifically covering three-quarters of the area directly exposed to the blast stream—to prevent steel shot from striking the chamber's outer walls; these plates are suspended for easy installation, removal, and replacement.
3. A three-layer sealing structure is installed at the top to prevent steel shot from leaking out during the blasting process.
1. The workpiece conveying system for the entire production line utilizes stepless variable-frequency speed control and consists of an input roller conveyor, a shot-blasting chamber roller conveyor, and an output roller conveyor.
2. The rollers for both the input and output roller tables are manufactured by welding heat-treated shaft ends to high-quality carbon steel seamless pipes, followed by integral machining on a lathe. Machining is performed after welding to ensure both a load-bearing capacity of 0.5 t/m and precise coaxiality.
3. The rollers within the shot blasting chamber that are subjected to the impact of the shot are all fitted with easily replaceable, wear-resistant sleeves made of special high-chromium-molybdenum iron.
4. The roller pitch is 600–800 mm, and the entire line utilizes variable-frequency speed control, enabling both high-speed and low-speed workpiece transport.
Wire mesh-belt conveyor type:
1. The system comprises dozens of transmission components, including carbon steel rollers, sprockets and chains, mesh belts, and bearings. The roller conveyor is divided into three sections: the infeed section, the shot-blasting section, and the discharge section. The rollers are constructed by precision-welding quenched-and-tempered end caps to high-quality seamless carbon steel pipes; their profiles and mounting dimensions are machined after welding to ensure compliance with load-bearing and coaxiality requirements.
2. The roller conveyors inside the blast chamber are equipped with easily replaceable wear-resistant medium-chromium cast iron sleeves. Labyrinth seals made of wear-resistant manganese steel are used at both ends of the roller shafts, completely preventing abrasive media from wearing down the bearings.
3. Utilizes imported HD wear-resistant manganese steel that has undergone solution and tempering treatments to eliminate internal residual stresses, moderately reduce the hardness of the manganese steel wire, and enhance its toughness and ductility.
4. A geared drive motor is installed on the right side of the conveyor belt and directly coupled to the drive roller, propelling both the belt and the workpieces; variable frequency speed control is employed, providing a conveying speed of 0.5–4 m/min.
5. A roller is installed under the driving shaft to serve as a guide and tensioner. When the steel mesh belt is loose, it can be tightened through this mechanism.
1. Two sets of light curtain sensing units are installed at the infeed and outfeed openings, respectively; the light curtain resolution can be selected based on workpiece size, and the units are used in pairs.
2. When a workpiece enters the shot blasting chamber, a light curtain at the inlet detects its presence, triggering a delayed start of the blast wheels. A light curtain sensor is also installed at the outlet; when the inlet and outlet sensors detect that no workpieces are passing through, the flow valve closes automatically and immediately to prevent "air blasting" (blasting without a workpiece present).
1. A mesh screen separator is connected to the elevator and positioned above the magnetic separator; fine material passes through the screen into the magnetic separator, while coarse material and impurities are conveyed by a spiral mechanism along the screen to the discharge port at the rear.
2. It is designed to finely separate usable shot, broken shot, and dust, ensuring the uniformity of the shot media.
3.Featuring a welded structure, the interior contains multiple carefully designed compartments for airflow guidance. An access door on the front allows for routine inspection and maintenance; this door is equipped with an air inlet to provide the necessary airflow for dust separation.
4. An adjustable multi-vane baffle structure is used to regulate the uniformity of the falling abrasive curtain.
5. Stationary magnets installed at both the top and bottom enable the fine separation of usable shot from broken steel shot, ensuring the consistency of the blast media.
6. A storage hopper is connected at the bottom; after separation, the usable shot flows into the hopper for storage and subsequent reuse.
1. Siemens PLC and touch screen
2. Siemens variable frequency drive (VFD) for speed control
3. Schneider low-voltage electrical components
4. Shot blasting time controller
5. AirTAC pneumatic components
6. Ammeter for flow monitoring
7. 1 lighting fixture
8. Dedicated constant-temperature air conditioning unit (optional)
Pulse-jet cleaning system
Precision filter cartridge filtration system
High-efficiency three-stage dust removal
Optimized and upgraded Donaldson (USA) dust removal technology system
Standard configuration： | ||||||||
| 1 | Electrical cabinet: This model comes standard with a cooling fan; air conditioning is available as an option. | |||||||
| 2 | Programmable Logic Controller (PLC): Siemens (other brands available as options upon customer request) | |||||||
| 3 | Touchscreen: Siemens (other brands available as options upon customer request) | |||||||
| 4 | Variable Frequency Drive (VFD): Inovance (China) — (Specific brands can be designated upon customer request; we recommend our domestic brand, as its quality is on par with or superior to Siemens.) | |||||||
| 5 | Power supply voltage: AC 380V, three-phase five-wire system | |||||||
| 6 | Low-voltage electrical components: Schneider (other brands available upon customer request) | |||||||
| 7 | Pneumatic components: ARITAC series (other brands available upon customer request) | |||||||
| 8 | Wires and cables | |||||||
| 9 | Qingdao KEEJOO Group can also customize various non-standard shot blasting machines according to your requirements. | |||||||
