The grooves formed by the steel/rubber tracks of the crawler-type shot blasting machine serve as the carrier for the workpieces. During operation, the tracks rotate, causing the workpieces in the grooves to roll. As a result, both the inner and outer surfaces of the parts can achieve better cleaning effects. This type of machine is available in manual and automatic loading and unloading modes, and is most suitable for shot blasting cleaning of large quantities of small parts. Due to the use of rubber tracks, the impact and scratches between the parts and the tracks are reduced, and the footprint is small, making the operation extremely convenient. Therefore, it has been adopted by many manufacturers.
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.)
An economical solution for surface treatment of anti-rolling components, consisting of a shot blasting hopper and polygonal drums combined with a series of shot blasting and workpiece processing techniques. The compact design, mature operation principles, strong cleaning ability, and gentle rolling feature are the advantages of batch-type shot blasting cleaning machines.
The following case pictures are all self-shot photos of the shot blasting machines produced by Qingdao KEEJOO Group.
Working Principle
A tumble-belt shot blasting machine uses a high-strength, wear-resistant rubber or 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 equipment 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 tumbling impact. The machine utilizes the trough-like cavity formed by the rubber belt to hold and convey the workpieces.During operation, the track rotates, causing the workpieces inside the chamber to tumble, thereby achieving effective cleaning on both the inner and outer surfaces of the parts. This machine model is available in manual and automatic loading/unloading configurations, making it ideal for shot blasting large quantities of small components. The use of rubber tracks reduces impact and scratching between the workpieces and the track, while its compact footprint and user-friendly operation have made it widely adopted by numerous manufacturers. Currently, this series includes models 3GN, 6GN, 8GN, 15GN, and 28GN.
Shot peening machines are specialized equipment designed for metal surface treatment. Shot peening is a process specifically engineered to enhance the fatigue strength of components subjected to alternating stresses. By utilizing a high-velocity stream of shot to impact the metal surface, a layer of cyclic plastic strain is generated; this induces beneficial microstructural changes in the surface layer and establishes a residual compressive stress field. Consequently, the metal's resistance to fatigue fracture and stress corrosion cracking is improved, thereby enhancing the product's reliability and durability.
Automatic loading and unloading model Manual loading model
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.
Qingdao KEEJOO Group – Roller Conveyor Steel Shot Blasting Machine Selected Cases
Hook Type Shot Blasting Cleaning Machine manufactured for Cummins Engine Company
Hook Monorail Shot Blasting Machine manufactured for Siemens
Hook Through-type Shot Blasting Machine for Doosan Heavy Industries
Hook Type Shot Blasting Machine manufactured for Komatsu Shantui Construction Machinery
Hook Through-type Shot Blasting Machine manufactured for Shandong Construction Machinery Factory
Large Hook Shot Blasting Machine fabricated for Caterpillar (USA)
Hook Type Shot Blasting Machine for Fans, custom-built for Willet Collette
Large Nuclear-special Shot Blasting Machine manufactured for Shentong Valve
We have delivered over 1,000 sets of hook shot blasting machines for domestic and overseas clients to date, maintaining an industry-leading track record.
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A major publicly listed agricultural equipment group in China has phased out its outdated shot blasting machines over the past two years, switching entirely to units developed and manufactured by Qingdao KEEJOO Group; the total number of these machines now stands at 36...
Introduction to the Components of the Shot Blasting Machine
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.
2Abrasive 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.
7Electrical 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 | Shot blasting of forged/steel parts surfaces | Shot blasting of forged/steel parts surfaces | Shot blasting of forgings/steel parts | Shot blasting of forgings/steel parts |
| 4 | Blast wheel type | Old-style Belt Type | New German-style Direct-coupled | Old-style Belt Type | New German-style Direct-couple | New German-style Direct-couple | New German-style Direct-couple | New German-style Direct-couple |
| 5 | Blast wheel No. | 1 set | 1 set | 2 sets | 1-2 sets | 2 sets |
| 6 | Blast wheel motor power | 7.5KW/11KW | 11KW-15KW | 11KW | 22-30KW | 22-30KW |
| 7 | Track (Aperture × Width × Thickness × Circumference) | 4-6*1140*20*3400 | 8*1380*22*4900 | 5700 | See general drawing | See general drawing |
| 8 | Load-bearing capacity (excluding fixtures) | ≤200kg/≤430kg | ≤300-650kg | ≤1000-1500kg
| 1500kg | 3500kg |
| 9 | single workpiece dimension | 500*500*500/700*700*700 | 1280*760*300 | 1380*800*400 | 1380*800*400 | 1600*1200*500 |
| 10 | Max. Inlet Size (Width × Height) | 678*604/750*800 | 904*965 | 1200*1500 | Reference | Reference |
| 11 | 80 Flow Valve | 1set | 1set | 2sets | 2sets | 2sets |
| 12 | German-style fully automatic flow valve | Optional | Optional | Standard Configuration | Standard Configuration | Standard Configuration |
| 13 | Dry Dust Collector | Optional | DC-4 | DC-8 | DC-12 | DC-24 |
| 14 | Pulse Dust Collector | MWDC80 | Optional | Optional | Optional | Optional |
| 15 | Effective volume | ø705×800mm/ø857×940mm | ø1100×1050mm | ø1200×1550mm | ø1200×1550mm | ø1200×1850mm |
| 16 | Loading Capacity | 220Kg/430Kg | 650Kg | 1500Kg | 1500Kg | 3500Kg |
| 17 | Automatic feeding mechanism | Electric loading | Electric loading | Electric loading | Electric loading | Electric loading |
| 18 | Automatic Unloading Mechanism | Vibratory Feeder (Optional) | Vibratory Feeder (Optional) | Conveyor Feeder | Conveyor Feeder | Conveyor Feeder |
| 19 | 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.
Next step？
Spare Parts and Consumables
We provide high-quality replacement parts with extended service lives. As a major supplier of spare parts in the industry, we offer rapid global delivery, helping you avoid the need for large inventories and preventing production downtime.
Equipment Upgrade
We will keep you updated on the latest technology upgrades so you can decide whether to incorporate them into your equipment's routine maintenance to ensure optimal service life.
Equipment Modernization and Upgrading
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)
