The KEEJOO brand continuous-feed shot blasting machine—utilizing a circular power-and-free conveyor system—achieves a rapid, efficient, and smooth cleaning process through state-of
The KEEJOO brand continuous-feed shot blasting machine—utilizing a circular power-and-free conveyor system—achieves a rapid, efficient, and smooth cleaning process through state-of-the-art transport and high-performance shot blasting technologies. Its continuous-feed design ensures the uninterrupted movement of workpieces.
Product Overview: This overhead-conveyor shot blasting machine utilizes a system—such as continuous movement, intermittent (step-by-step) movement, or an advanced power-and-free conveyor—to transport workpieces. This setup allows workpieces to remain stationary during loading/unloading and within the blasting zone, enabling precise, fixed-point processing. Depending on the specific workpiece, the system supports single-point loads ranging from 50 kg to 2,000 kg. Offering high productivity and reliable operation, it is ideally suited for the mass cleaning of various parts that can be suspended. Designs can be customized to meet specific user requirements.
Applications
Suitable for shot blasting, deburring, and descaling of hangable parts (such as those with mounting holes), welded steel structures, and various castings and forgings. It delivers exceptional cleaning results for components such as engine blocks and cylinder heads, motor housings, gears, motorcycle engine casings, locomotive coupler yokes, bogie assemblies, hardware tool housings, and water pumps. It is an ideal choice for industries including automotive, tractor, diesel engine, electric motor, and valve manufacturing.
Standard Operating Principle: To initiate the shot blasting process, the system is switched to automatic mode, activating the abrasive recovery and dust collection systems. Workpieces are transported into the blast chamber by a power-and-free conveyor system. Upon triggering the entry light curtain, the first set of blast wheels starts sequentially, followed by the second set after a time delay to prevent "dry blasting" (blasting without a workpiece present). The workpiece-laden hangers move forward at a constant speed driven by the conveyor assembly; simultaneously, the blast wheels project high-speed abrasive in a fan-shaped pattern, striking the workpiece surfaces uniformly to achieve the cleaning objective. Spent abrasive falls to the bottom of the chamber into a screw conveyor mechanism, which transports the material to the base of a bucket elevator. The elevator lifts the abrasive to an upper screw-screen separator; the screen separates out fine particles—which then undergo secondary separation in an air separator—while large debris is discharged from the main housing. After separation, usable abrasive is stored in a hopper for recycling. Separated sand fines and broken shot are discharged through a waste chute into a waste bin, aided by the air separator and gravity. Dust is directly extracted by the dust collection system and trapped on filter cartridges within the dust collector housing; a pulse-jet cleaning system periodically dislodges the dust, causing it to fall into a collection bin for timely disposal.
Application:
This machine utilizes shot blasting technology to process complex castings, such as pump bodies. It removes surface contaminants—including adhering sand and oxide scale—and relieves internal stresses caused by casting and heat treatment processes. This enhances the workpiece's fatigue strength and imparts a uniform surface roughness, thereby significantly improving paint adhesion quality and coating durability.
The machine's abrasive circulation system utilizes a direct-drive blast wheel with a high flow rate, facilitating easy maintenance and boosting efficiency by 20%. It incorporates magnetic drum separation technology to remove quartz sand from the abrasive, thereby reducing wear on the blast wheel (as every 1% increase in quartz sand content leads to a tenfold increase in blade wear). Additionally, the system employs a "rotation plus oscillation" blasting method, completely eliminating any blind spots in the blast coverage.
The workpiece handling system utilizes a state-of-the-art power-and-free conveyor—an advanced, next-generation model—featuring storage, transport, and accumulation capabilities. Equipped with wide pushers and a dual-carrier accumulation mechanism, it delivers higher conveying efficiency and superior operational stability.
The machine's drive system exclusively utilizes SEW products, ensuring reliable operation.
The electromechanical control components of this machine are products of the U.S. company AB, featuring stable performance and reliable operation.
The power-and-free overhead conveyor is currently recognized worldwide as the most advanced type of conveyor equipment. Our company possesses proprietary technology for the design, manufacture, installation, and commissioning of these systems, and we undertake orders and system design projects for clients both domestically and internationally.
The term "power-and-free" (or "accumulating") overhead conveyor derives from the system's ability to stop, accumulate, and subsequently restart the conveyed loads at any required point along the line. Consequently, this type of conveyor system is capable of handling not only basic material transport tasks but also complex material storage and handling requirements. It introduced the industrial sector to a highly adaptable material transport system that offers precise positioning and predictable operation.
Power-and-free overhead conveyors offer the following distinct advantages:
1. Power-and-free overhead conveyors combine the capabilities of slat, roller, and tabletop conveyors with those of standard overhead conveyors. They can lift, lower, unload, and rotate loads by 90 degrees at designated workstations without the need for additional auxiliary equipment. Consequently, the use of power-and-free overhead conveyors minimizes the need for various auxiliary transport devices, thereby reducing total investment costs.
2. The use of a power-and-free overhead conveyor system enables the integration of all factory processes into a unified, cohesive system. Computerized control allows the system to optimize material flow based on real-time production conditions. Furthermore, the system can anticipate potential issues and make adjustments or compensations before they impact production.
3. Each carrier can transport a heavier load to the workstation at high speed, saving time on inter-station transfers and increasing production efficiency.
4. High-speed transport also means a significant reduction in the number of carriers and chain traction force, lower loads on the tracks, and increased storage space.
5. A certain amount of buffer storage is provided at each workstation, imparting flexibility to the production process. This ensures that if a malfunction occurs at a specific workstation, the system can continue to operate normally without interruption for a specified period.
6. New workstations can be easily expanded by adding chains.
The wide-pusher power-and-free overhead conveyor is an upgraded version of the power-and-free conveyor; its comprehensive technical performance has reached the advanced level of similar international products.
HG Accumulating Conveyor Shot Blasting Machine
Delivery：
9Weeks+
Technology：
shot blasting
Application：
Cleaning, derusting, painting, pressure welding, and preparation for electroplating; derusting; thermal descaling.
Industry:：
Light/Medium-duty
Process:：
Continuous passage
Advantage
High-efficiency blast wheel configuration
A wide range of equipment configurations and sizes is available.
State-of-the-art conveying technology
Features
The latest accumulating chain conveyor technology
High-efficiency blast wheel configuration
A variety of equipment configurations and sizes are available.
Application
Remove rolling chips and forging scale.
Shot-blasting pretreatment of steel structural components prior to coating
Remove flash and burrs.
Increase surface roughness
Remove molding sand and remaining residues.
High-efficiency & Smooth Shot Blasting Solutions
The Qingdao KEEJOO Group overhead continuous-feed shot blasting machine utilizes state-of-the-art transport and high-efficiency shot blasting technologies to deliver a rapid, seamless, and productive cleaning process. Its continuous-feed design ensures the uninterrupted movement of workpieces. The combination of adjustable transport speeds and powerful blast wheels guarantees effective cleaning, while the system is easily integrated into existing automated production lines.
Compared to conventional shot blasting units, the HAOPIN units equipped on this machine offer higher efficiency, enabling rapid processing while effectively reducing abrasive consumption. The units are arranged in a diagonal "X" configuration relative to the moving workpiece, ensuring maximum surface coverage during cleaning. This design allows for effective shot blasting of complex components, including leading edges, welded parts, and flame-cut components.
Process Flow
The workpiece is suspended from a hook and enters the blast chamber via a manually operated rail or a fully automatic conveyor track (optional); high-efficiency blast wheels then perform surface treatment on the workpiece. The blasting cycle runs according to a preset duration; once the blast wheels stop, the exit door opens, and the hook automatically exits the chamber.
Ring gauge suspended conveyor track
The ring conveyor system utilizes an overhead track to move workpieces through the equipment at a constant speed. This conveyor consists of a chain and trolley system suspended from the track, capable of either continuous drive or index-style (station-to-station) movement.
Conveyor speed or indexing time can be adjusted in coordination with the blast wheel power and specific surface treatment requirements. The system is easily scalable to suit the factory layout and can be readily integrated into blasting operations.
Features and Options
Standard equipment: Spent shot and abrasive particles fall into the collection hopper beneath the blast chamber and are conveyed via a screw conveyor to a bucket elevator, which transports them to the abrasive recovery unit.
In this unit, used shot passes through a screen plate—which captures any oversized particles—and enters the shot hopper/air wash separator, where the shot is cleaned for reuse.
Mid-sized application options
To improve shot cleanliness, for example the separation of aluminum trim, a vibrating screen can be installed between the shot recovery unit and the shot bin.
Selection Options for Foundry/Heavy-Duty/Molding Sand Applications
A vibrating conveyor can replace a screw conveyor, providing preliminary cleaning and separation of molding sand and heavy contaminants from the used shot. To extend the equipment's service life, it is advisable to equip the conveyor with an optional magnetic separator to remove molding sand. The shot then proceeds to the air-wash separator for standard processing.
Fully automatic powered conveyor
The fully automatic power conveyor features two vertically stacked rails: the traction chain runs along the upper rail, while the transport units are suspended from the lower rail. This system offers a high degree of flexibility in linking different production processes.
Due to its robust and durable design, Qingdao KEEJOO Group's fully automatic power conveyor is especially suitable for certain special applications, such as high-dust and high-temperature working environments.
In operation, the power-and-free conveyor system enables fully automated transport through the continuous overhead shot-blasting machine and integrates with advanced production control systems—for instance, by linking the shot-blasting machine between a die-cutting machine and a crack detector. Within the isolation system, operators can initiate fully automated processing simply by activating a preset number of carriers.
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.
Selected Case Studies of KEEJOO Brand Shot Blasting Machines
Hook-type shot blasting machine manufactured for Cummins Engine Company
Hook and monorail conveyor 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
Large-scale hook-type shot blasting machine for Caterpillar (USA)
Hook-type shot blasting machine for wind power fans, manufactured for Collett & Fil
Large-scale shot blasting machine dedicated to the nuclear power industry, manufactured for Shentong Valve
To date, we have successfully delivered over 1,000 sets of hook-type shot blasting machines both domestically and internationally, maintaining a clear industry-leading position.
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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
1Blast 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.
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.
4Step-action pneumatic AB doors or continuous light curtain sensing system.
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.
1. Two sets of light curtain sensors are installed at the inlet and outlet, respectively; used in pairs, the sensor density can be selected based on workpiece size.
2. When a workpiece enters the blast chamber, the inlet light curtain detects its arrival, triggering a delayed start of the blast wheel. A light curtain sensor is also installed at the outlet; when the sensors at both the inlet and outlet detect no workpieces, the flow valve automatically closes immediately to prevent "air blasting" (blasting without a workpiece present).
5
Automatic overhead conveyor System
1. One set of automatic closed-loop overhead conveyor system.
2. One set of tooling system, fabricated by welding wear-resistant steel rods after heat treatment (design can be customized based on specific customer requirements).
3.Variable frequency speed control, allowing speed adjustment according to shot blasting requirements.
5.1
Y‑shaped guide rail and automatic hanger changeover system
1. One set of Y-track trolley systems enables continuous operation across two workstations. A pneumatic valve controls the track-switching mechanism. While one hoist unit is engaged in the shot-blasting process, the other is used for loading and unloading.
2. Two sets of tooling systems, fabricated by welding wear-resistant steel rods after heat treatment (designs can be customized to meet specific customer requirements).
3. Two sets of hoist systems featuring a four-section telescopic framework and a chain electric hoist mechanism, ensuring excellent stability.
6
Sorting 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)
8
Dust collector
1.Pulse-jet cleaning system
2.Precision filter cartridge filtration system
3.High-efficiency three-stage dust removal
4.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.
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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Spare Parts and Consumables
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High-end Shot Blasting Unit Manufacturing Workshop
Equipment Upgrade
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