This equipment is designed for high-performance, targeted surface treatment of metal sheets and profiles.Product OverviewDuring the cleaning process of the wide-roller-conveyor pas
This equipment is designed for high-performance, targeted surface treatment of metal sheets and profiles.
Product Overview
During the cleaning process of the wide-roller-conveyor pass-through shot blasting machine, a variable-speed roller conveyor—controlled by an electrical system—transports steel structural components or steel stock into the blasting zone within the machine's chamber. All surfaces of the workpiece are subjected to intense, concentrated bombardment and abrasion by abrasive media (shot) striking from various angles; this rapidly removes mill scale, rust, and contaminants, resulting in a clean steel surface with a specific roughness profile. Workpieces are loaded and unloaded on the roller conveyors located at the inlet and outlet ends outside the cleaning chamber. A blow-off system removes shot and rust dust from the steel surfaces; the resulting mixture falls into the chamber hopper and is transported by recovery screws and longitudinal/transverse screw conveyors to the base of the elevator, which lifts the material to the separator at the top of the machine. Cleaned shot is deposited into the separator hopper for recirculation in the blasting process, while dust-laden air is drawn into a dust collection system; the air is purified before being discharged into the atmosphere, and particulate dust is captured and collected.
Applications
Large quantities of steel plates, steel strips, weighing equipment, trailer and pallet truck axles, chassis frames, radiators, stone materials, profiles, structural steel, drilling tools, H-beams, steel structures, aluminum products, steel pipes, angle steel, channel steel, round steel, bars, aluminum sheets, coiled sheets, iron towers, rebar, etc.
High-performance, specialized surface treatment equipment for metal sheets and profiles.
High-speed feeding, long maintenance intervals
Specially configured shot blasting wheel angles reduce shot blasting time by 5%–20%.
Designed specifically for integration with fully automated production lines.
Features
High-performance, specialized surface treatment equipment for metal plates and profiles
High-speed infeed and long maintenance intervals
Specially angled blast wheel configuration reduces blasting time by 5%–20%
Designed specifically for integration into fully automated production lines
Application
Cleaning
Corrosion removal
Paint stripping
Rust and scale removal
Highly efficient
The KJ-C roller conveyor shot blasting machine demonstrates peak performance for this series when processing metal plates and profiles.
The key distinction between this model and others on the market lies in the angled arrangement of the blast wheels located at the top of the machine. This configuration minimizes the accumulation of abrasive media on long profiles. It significantly increases the proportion of blasting energy directed at the primary tasks—namely, rust and scale removal—while preventing the excessive buildup of abrasive material.
Blast Wheel Angle vs. Travel Speed
In practice, compared to roller conveyor shot blasting machines with vertically mounted blast wheels, the K-type roller conveyor shot blasting machine—featuring blast wheels mounted at an angle—offers a shot blasting efficiency that is 5–20% higher.
The K-type roller conveyor shot blasting machine is suitable for applications requiring high throughput speeds and long maintenance intervals.
Suitable for metal sheets and profiles.
These features make the machine particularly practical for integration into fully automated production lines and suitable for the shot blasting of metal plates and profiles.
The HD-series roller conveyor shot blasting machine is primarily equipped with the latest generation of blast wheels. Naturally, the equipment also offers a range of optional features, such as automatic blast wheel shut-off for workpieces that do not span the full width of the machine, external adjustment of blast patterns, and automatic separation of boring and sawing chips.
Shot blasting chamber
The blast chambers across KEEJOO’s entire range of roller conveyor shot blasting machines are constructed from Hardox steel plate. Manganese steel possesses high hardness, capable of withstanding shot impact hardness levels ranging from 35 HRC to 50 HRC or higher, making it an excellent material for shot blasting applications. Additional 10mm-thick Hardox steel plates are installed in the "hot spots" (areas subject to the most intense impact) of the blast chamber; these are externally mounted for easy replacement. For high-impact blasting operations, liners made of manganese steel, tool steel, or cast materials can be installed.
To prevent shot leakage, several layers of rubber pads or VSA curtains are installed in areas subject to excessive wear; these are mounted on V-shaped rails to facilitate replacement.
Abrasive Cleaning Device
After the shot blasting process, workpieces may still be covered with abrasive media, which must be removed. The cleaning tool consists of a rotary brush securely mounted on an interchangeable brush holder.
To prevent abrasive accumulation on long components, the rotary brush gently sweeps used media from the workpiece surface into a specially designed trough; this trough houses a screw conveyor that returns the media for recycling. To maintain the relative positioning of the brush and the screw conveyor, both are mounted on a single adjustable frame, ensuring consistent alignment when processing workpieces of varying sizes. The frame can be adjusted either manually or automatically, with vertical positioning increments of less than 5 mm. Finally, any remaining media is removed using a blow-off unit—mounted on the same frame—which utilizes a high-pressure blower to clear away residual material.
Shot blasting machine for weighbridge platforms (pictured below)
Following the successful installation of the roller-conveyor shot blasting machine in Spain, the client expressed high satisfaction and praise for the products and services provided by KEEJOO Machinery! KEEJOO Group’s shot blasting machines have earned an excellent reputation in markets across Europe, the Americas, Japan, and South Korea. (Pictured below)
Cartridge Dust Removal Unit
During the shot blasting process of the workpiece, rust and scale will begin to form, as well as broken shot dust (or fine powder). The fine powder is separated in a shot cleaner, which can be adjusted to different types and sizes of shot blasting media. The cartridge dust collector that generates the necessary pressure is mounted on top of the machine for RB 600, RB 1000 and RB 1500, and next to the shot blasting machine for larger machines from RB 2000 onwards.
The impact separator within the cartridge filter unit not only ensures the separation of fine dust particles—thereby protecting the filter cartridges from unnecessary wear—but is also certified as a spark-extinguishing device, serving as a key component in achieving compliance with ATEX regulations. The cartridge dust collector employs compressed air pulses to automatically clean the filter cartridges; the intensity and duration of these pulses can be adjusted based on the type and quantity of the dust. The entire cartridge filtration process operates without creating ignition sources.
Loading and unloading
Regarding the basic equipment, the inlet and outlet roller conveyors are powered by the shot blasting machine's central drive unit; however, to enhance efficiency, separate drive units can be installed, with associated variable frequency drives automatically synchronized.
If the curved workpiece has undergone shot blasting but cannot be thoroughly cleaned using rotating brushes and air blow-off points, it is recommended to use a longer collection track and a recovery conveyor to help ensure the shot media is recovered by the equipment.
Installing a transverse feeding system enhances efficiency in multiple ways. Furthermore, this system can be installed alongside the shot blasting machine on the sawing and drilling production line.
Abrasive
The abrasive media used in most roller conveyor shot blasting machines is typically spherical (cast steel shot or conditioned cut wire shot). The media circulates through the equipment, continuously removing contaminants.
Achieving optimal shot blasting results requires a balanced mix of new and used media. The finer media in this blend is crucial for ensuring uniform surface coverage, while the coarser media is essential for removing mill scale.
Using the correct shot media is crucial for the shot blasting process, as it ensures optimal results.
Here are the usage guidelines:
For heavy-duty workpieces (such as thick plates and profiles), use a coarser shot mixture (steel shot size S390 and larger); for finishing workpieces (such as thin sheet metal), use a fine shot mixture (steel shot size S330 and smaller).
Comparison Before and After Cleaning
Technical Specifications
Model
KJ1500HD
KJ 2000D
KJ 2500HD
KJ 3000HD
KJ 4000HD
Feed opening width (mm)
1600
2100
2800
3300
4300
Feed opening height (mm)
550
550
550
550
550
Processing speed (m/min)
1.5-4.5
1.8-5.0
1.0-3.0
0.8-2.5
0.8-2.0
No.of blast wheel
4
6
6
6
8
Power per shot blasting unit (kW)
15/18.5
15
11/15/18.5
15/18.5
11/15
Roller spacing (mm)
800
800
750
750
750
Optional Roller Spacing (mm)
400
400
500
500
500
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
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.
......
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
1Blast wheel
1. 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%.
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.
2Flow control 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.
4Variable-frequency automatic speed-regulating conveyor system (comprising an infeed roller conveyor, a shot-blasting zone roller conveyor, and an outfeed roller conveyor with automatic speed regulation)
Roller conveyor pass-through type:
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.
5Light curtain sensing system, automatic loading system/automatic unloading system
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).
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)
8Dust collector
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.
Specifications (Hangzhou Southeast Space Frame Steel Structure Project)
Qingdao KEEJOO Group Roller Conveyor Shot Blasting Machine: Specifications and Configuration List
No.
Name
Roller conveyor type shot blasting machine
1
Model
KJ-2230P15-16
KJ-2028P11-14
2
Sorting configuration
Air separation
3
Application
Shot blasting and derusting of large workpieces, profiles, and welded steel structures.
4
Blast wheel type
German-style High-Performance HAI Shot Blasting Unit
American-style Pan-bagnat
5
No. of blast wheel
16 sets
6
Blast wheel motor power
11KW
7
Roller spacing
φ280*1000
8
Load-bearing capacity (excluding fixtures)
≤5吨
9
Dimensions of a single workpiece (width × height × length)
≤2200*3000*14600mm
10
Max entrance dimensions (width x height) in mm
2400*3000mm
11
Semi-automatic flow valve
16 Sets
12
Fully automatic flow valve
Optional
13
Dry dust collector
QL-48 Filter Element (37 kW)
14
Wet dust collector
Optional
15
Airflow (m³/h)
≤38000
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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High-end shot blasting unit manufacturing workshop
Equipment Upgrade
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