The steel track shot blasting machine utilizes a high-strength, wear-resistant manganese steel belt to carry the workpieces. It employs a high-speed rotating impeller to propel
The steel track shot blasting machine utilizes a high-strength, wear-resistant manganese steel belt to carry the workpieces. It employs a high-speed rotating impeller to propel abrasive media onto the workpieces within the chamber, thereby achieving the cleaning objective. This machine is suitable for sand removal, descaling, oxide layer removal, and surface strengthening of small castings, forgings, stamped parts, gears, and springs; it is particularly well-suited for cleaning and strengthening parts that can withstand impact. The machine uses the trough-like cavity formed by the manganese steel belt as the carrier for the workpieces. During operation, the rotating tracks cause the workpieces within the chamber to tumble, ensuring effective cleaning of both their inner and outer surfaces. Featuring automatic loading and unloading capabilities, this type of machine is ideally suited for the shot blasting of large batches of small parts; current models include the 6GN, 15GN, and 28GN. Shot peening machines are designed specifically for metal surface treatment; shot peening is a process engineered to enhance the fatigue strength of components subjected to alternating stresses. It utilizes a high-velocity stream of shot to impact the metal surface, creating a layer of cyclic plastic strain. This induces beneficial microstructural changes in the surface layer and introduces a residual compressive stress field, thereby improving resistance to fatigue fracture and stress corrosion cracking, and ultimately enhancing product reliability and durability.
Applications
Suitable for cleaning adhered sand, scale, and other deposits from the surfaces of small castings, forgings, stamped parts, and springs—including thin-walled or impact-sensitive components—in heat treatment workshops; it can also be used for surface strengthening. (Do not use to clean high-temperature parts, slender components, or parts with burrs or flash, as these can easily damage the conveyor belt.)
Shot-blasting hoppers and polygonal drums—combined with a range of shot-blasting and workpiece handling technologies—offer a cost-effective solution for the surface treatment of parts that require gentle tumbling. Key advantages of this batch-type shot-blasting machine include a compact design, proven operating principles, powerful cleaning capabilities, and a gentle tumbling action.
The following photos show shot blasting machines manufactured by Qingdao KEEJOO Group, taken on-site during production.
Force workpieces to rotate and tumble gently for all-round shot blasting treatment.
Perform targeted, high-performance shot peening for specific applications.
Continuous and thorough removal of shot-blasting media
Special design allows for the use of aluminum shot.
Remove shot, molding sand, or scale.
Wear-resistant steel belt configuration
Ergonomic maintenance platform
Application
Rust removal from forged or heat-treated workpieces
Sand removal from ferrous and non-ferrous metal castings
Sand removal from ferrous and non-ferrous metal castings
Shot peening (specific version, featuring two bidirectional blast wheels and automatic control cage adjusters)
Flexible, economical, and reliable: the philosophy behind the GN series of batch-type steel-belt shot blasting machines underpins the development of Chunjiu’s drum-type shot blasting equipment. These machines deliver reliable process technology combined with a high degree of flexibility and adaptability to specific requirements—including cost-efficiency. Cost-conscious users have a range of options available for the surface treatment of parts.
Reliable process technology offering high flexibility: small parts are cleaned to the same high standards as larger components, ensuring consistent results. Chunjiu’s machines are specifically designed to minimize the height required for loading and unloading, thereby reducing the risk of damage to delicate parts.
Design and operating sequence
Qingdao KEEJOO Group’s tumble-belt shot blasting machines are designed specifically for batch processing. By utilizing appropriate loading and unloading equipment, these machines can be integrated into existing production facilities to establish a continuous workflow.
A loading device feeds workpieces into the trough-shaped blast chamber, which is equipped with either a continuous rubber belt or a steel slat conveyor and adjustable transverse discs. A low-vibration plate removes shot, burrs, flash, or scale—as well as accumulated abrasive—prior to the separation stage (an optional feature on smaller machines). The conveyor speed can be adjusted based on the tumbling action to ensure each workpiece remains in the blast zone for the required duration.
If the conveyor belt runs in the opposite direction, it discharges workpieces from the machine into a container or onto a conveyor. Loading and unloading operations are tailored to production requirements: manual, mechanical, or automatic loading allows the Chunjiu tumble-belt shot blasting machine to be integrated into continuous production processes.
Optimizing Shot Blasting Results: During the process, workpieces—regardless of size or shape—are tumbled continuously and evenly, ensuring that internal areas and passages are thoroughly cleaned. This is essential for effective and uniform treatment of all surfaces. As the parts tumble, shot media is continuously discharged from the surfaces and internal cavities; the duration of the final tumbling phase—following the actual blasting—can be adjusted to suit the specific type of workpiece, ensuring complete removal of the media. The blast chamber features a high-integrity seal that prevents leakage and minimizes shot consumption.
Steel or rubber tracks: All machines in the 3Gn to 28Gn series are equipped with wear-resistant rubber belts and steel tracks. These machines are also suitable for processing light alloy parts.
Large-scale equipment: Models such as the 15Gn to 28Gn-7M are commonly used for the shot-blasting of heavy-duty components. They are equipped with steel belts or specialized wear-resistant high-manganese steel slats to meet the demands of heavy-duty applications, specific operational requirements, and the need for a long service life.
Qingdao KEEJOO Group offers a comprehensive range of tracked equipment—available with either rubber or steel tracks—designed for various applications and operational processes. Other equipment types and sizes can also be selected to meet specific customer requirements.
Introduction to the Components of the Shot Blasting Machine
1
Blast wheel
The blast wheel and motor adopt Germany-joint developed high-efficiency HP technology. Compared with conventional old-style blast wheels, this design eliminates multiple friction loss links, lifting motor efficiency by 20%, cutting down fault points and slashing maintenance costs by 50%.
It features a more compact footprint than traditional blast wheels, supports arbitrary installation angle arrangement, and enables far easier inspection and maintenance.
Constant blasting performance is maintained throughout operation, free from inconsistent and fluctuating cleaning quality seen on conventional units.
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.
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.
Equipped with SKF bearings imported from Sweden.
Fitted with genuine Siemens motors.
German Schenck dynamic balancing tester is applied to guarantee precise high-speed dynamic balance of impeller hubs.
2 1Abrasive flow valve
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.
3Blasting chamber
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.
4Pneumatic Door AB
1. The shot blasting chamber features a compact structure and a sealed design based on German technology, ensuring that abrasive media does not scatter during operation.
2. The door utilizes an automatic opening and closing mechanism controlled by pneumatic cylinders.
3.Employing specialized processes and technology, the door is more reliable than conventional designs; it resists deformation and maintains its sealing integrity for 20 years—overcoming the performance degradation typical of traditional sealing methods after just six months.
5Automatic Loading System / Automatic Unloading System
1.Charging door
The charging door is constructed from welded steel and features a high-manganese steel protective plate with a labyrinth-style guard design. It is driven by an electric trolley with a link chain (equipped with a safety pin) and includes a detection switch to monitor the door's position.
2. Feeding machine
The charging machine consists of a support frame, a carriage, and a link-chain drive mechanism. Protective plates are mounted on both sides of the frame, with control buttons installed on one side. The frame supports a pivoting arm; when the drive mechanism is activated, the material hopper ascends along the internal channel of the arm. Simultaneously, the arm rotates around its pivot point, causing the hopper—during its ascent and rotation—to tilt toward the cleaner's feed opening and discharge the material into the drum.
A rotary proximity switch is located at the drive shaft end to limit the upper travel limit of the hopper, while a proximity switch signals the completion of the movement once the hopper has descended.
Discharge system
1. An automatic unloading mechanism: Workpieces that have undergone shot blasting are discharged from the blast chamber, fall onto the automatic unloading mechanism, and are then conveyed into a collection bin by a vibration device.
2. An anti-drop, vibration-dampening rubber pad is installed on the unloading mechanism; it effectively prevents impact between the parts and the damping plate, providing excellent protection.
6Sorting system
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.
7
Electrical control cabinet
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)
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 requirem
Crawler-type Shot Blasting Machine Configuration List
No.
Name
Semi-automatic Rubber Belt Tumblast Shot Blasting Machine
Fully automatic
Rubber tracks
Fully automatic steel tracks
Fully automatic steel tracks
1
Model
3GN
6GN
SNB-I
SNB-II
15GN-5R
15GN-7M
28GN
2
Track configuration
Rubber tracks
Rubber tracks
Steel tracks
Steel tracks
3
Application
Shot blasting and strengthening of forged/steel component surfaces
Overall Dimensions of Bare Machine (L × W × H, mm)
2500*2800*4500
3249*3482*5149
See General Drawing
See General Drawing
See General Drawing
20
Dimensions Including Dust Collector (Length × Width × Height)
7500*4100*4600
6885*3482*5149
See General Drawing
See General Drawing
See General Drawing
21
Total power + dust collector
13KW/24KW
23KW/30KW
45KW
45KW
65KW
22
Environmental Dust Removal
20mg
20mg
20mg
20mg
20mg
Qingdao KEEJOO Group comprises three subsidiaries and an international business division, standing as a leading Asian manufacturer of high-end shot blasting and peening machinery, as well as environmental protection equipment. The company has introduced and developed over 100 types of shot blasting and peening machines for cleaning and surface strengthening; more than 20 of these products have filled gaps in the domestic market. Its products are utilized by renowned enterprises such as ThyssenKrupp, Siemens, FAW-Volkswagen, Cummins Engine, Dongfeng Motor, Weichai Power, Sinotruk (Jinan), China High-Speed Rail, Bombardier, Chery Automobile, North Benz, Hitachi Nuclear, Sany Heavy Industry, Fuji Heavy Industries, Tangshan Gear, Aisin (Japan), Alstom (France), Doosan (South Korea), and Caterpillar (USA). With exports reaching 49 countries—including Spain, France, the USA, South Korea, Japan, Singapore, Australia, and Russia—the company enjoys an excellent global and domestic reputation.
In recent years, by introducing and assimilating advanced technologies from companies such as Germany's AGTOS, KEEJOO has achieved a world-class level in product design. The company's high-efficiency, direct-drive shot blasting wheel—representing the best of Asian technology in this field—has garnered praise and recommendations from customers in Europe and the Americas.
The company was among the first in China's casting machinery industry to obtain ISO 9001, German TÜV, EU CE, French BV, and North American FCC certifications, as well as import-export rights. By introducing and further optimizing technologies from Germany, the United States, and other regions, the company has enhanced product performance and accelerated the phase-out of outdated technologies, earning recognition from new and existing customers worldwide.
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