The Cold Roll Surface Texturing Machine employs a shot-blasting unit to project high-speed abrasive media onto the workpiece surface from a distance, enabling a non-contact cleaning process; consequently, the technique is not constrained by the size, shape, or weight of the workpiece. Shot-blasting texturing is currently a widely adopted, economical, and reliable method for surface texturing on an international scale.
High-efficiency equipment to ensure accurate surface roughness
When producing flat rolled products—such as strips—on rolling lines, ensuring the correct surface roughness of the cylindrical rolls used to convey the material is crucial. The REC21 texturing machine manufactured by KEEJOO (Qingdao) is the ideal equipment for this process and is widely used in numerous rolling mills around the world.
By utilizing shot media of varying sizes—processed and applied within the same machine or even on the same workpiece—the REC21 etching and rolling machine delivers reliable surface roughness for cylindrical mill rolls, meeting the requirements of all industries, from automotive manufacturing to general industrial sectors.
Shot blasting operations can be fully controlled via a variable frequency drive (VFD), which regulates the abrasive velocity of the blast stream and the drum configuration to meet specific, demanding application requirements.
The working principle of roll shot-texturing involves converting the kinetic energy of the shot into impact force against the workpiece surface. The efficiency of the shot-blasting process depends on the quantity, size, and velocity of the shot, as well as the direction of impact. Consequently, the economic and technical performance of the shot-blasting machine relies almost entirely on the performance of the blast wheel unit. Specifically, roll texturing utilizes uniform shot bombardment to impart a consistent surface roughness to the working surface of previously ground steel-rolling rolls.
Working Principle of the RE21 Roll Surface Shot Blasting and Texturing Machine
Once the trolley enters the shot blasting chamber and is locked in position, the workpiece (i.e., the roll) rests on the trolley's rubber-covered rotating rollers and spins at a constant speed around its axis. Shot blasting units mounted on the chamber roof project specialized abrasive media to bombard the working surface of the roll, achieving a uniform surface roughness without compromising the original geometric accuracy (including the crown profile).
To date, KEEJOO has supplied roll shot-blasting and texturing equipment to both domestic and international companies, including Pakistan International Steel, ThyssenKrupp, Sinosteel International, Tangshan Guofeng Group, Baosteel Group, and Maersk.
Workpieces: Mill cylinder rolls Workpiece dimension: D max 800 mm, L max 5000 mm (table 2500), standard Process: External roughness etching Blasting: 1 x 22 kW wheel, on the standard version Shot separation: Airwash type, with vibrating sieves Shot recovery: Lower screw, elevator, multiple hopper, Replenishers Abrasive: Steel grit (3 sizes on the standard version) Pieces handling: 1 piece per cycle, automatic work car Dust collector: Reverse cartridges type
Workpiece: Rolling mill roll
Workpiece dimensions: Max. diameter 800 mm, max. length 5000 mm (working length 2500 mm); standard configuration
Process: External surface texturing (etching)
Blasting: 1 x 30 kW blast wheel (imported); standard German version
Abrasive separation: Air-wash type with vibrating screen
Abrasive recovery: Bottom screw conveyor, bucket elevator, multiple hoppers, replenisher
Abrasive media: Steel grit (3 sizes included in standard version)
Part handling: 1 piece per cycle; automatic transfer cart
Dust collector: Pulse-jet type
1 Rollers for texturing
Maximum weight 5 tons
Diameter Φ300–1500 mm
Maximum length of textured roll surface 1550–2300 mm
Roller hardness HSD 91–95
2 Power and utility requirements
Power supply AC 3-phase 4-wire system, 380 V ±10%, 50 Hz ±0.5 Hz
Compressed air Consumption: 2 m³/min; Pressure: 0.5–0.6 MPa
3 Temperature Workshop: 40°C to -20°C;
1.2 Overview of the Technical Solution
Shot blasting is a non-contact cleaning process that employs a blast wheel to project high-speed abrasive media onto the surface of a workpiece from a distance; consequently, the process is not constrained by the size, shape, or weight of the workpiece. Shot blasting technology is currently the most widely used, economical, and reliable cleaning method internationally.
The working principle of shot blasting involves converting the kinetic energy of the shot into impact force against the workpiece surface. The efficiency of the process depends on the quantity, size, and velocity of the shot, as well as the direction of impact. Consequently, the economic and technical performance of a shot blasting machine relies almost entirely on the performance of the blast wheel unit. Roll texturing, on the other hand, utilizes uniform shot blasting to impart a uniform roughness to the working surface of a previously ground steel-rolling roll.
Working Principle of the RE60 Roll Surface Shot Blasting and Texturing Machine
Once the trolley enters the shot blasting chamber and is locked in position, the workpiece (i.e., the roll) rests on the trolley's rubber-covered rotating rollers and spins at a constant speed around its axis. Shot blasting units mounted on the chamber roof project specialized abrasive media to bombard the working surface of the roll, achieving a uniform surface roughness without compromising the original geometric accuracy (including the crown profile).
The RE60 roll surface shot-blasting and texturing machine is a system featuring a high degree of mechanical and electrical automation integration. To ensure the equipment's advanced nature and reliability, we plan to employ the following key technologies and assurance measures:
1.2.1 Mechanical components
1.2.1.1 The RE60 roll surface shot-texturing machine is specialized equipment designed to meet the requirements of steel plate production; it is used to texture specific sections of roll surfaces via shot blasting to achieve the desired uniform roughness. It utilizes a specialized curved-vane shot blasting unit with a flow rate of 250–400 kg/min, powered by a 30 kW ABB motor. The blasting unit is mounted at the top of the machine housing. To accommodate the specific characteristics of the workpieces, the machine employs a dedicated transport carriage to carry the rolls, supporting them at the roll neck shoulders using four rubber-coated or polyurethane rollers. During the texturing process, all areas of the roll—except for the specific section to be textured—are shielded by wear-resistant liners (made of high-chromium cast iron, high-manganese steel, rubber, or polyurethane), ensuring that only the designated area is subjected to the shot-blasting impact. A hydraulic system controls the lifting and rotation of the support rollers, ensuring optimal texturing results when processing rolls of various specifications.
This machine is equipped with the HAI Ocean Surge® direct-coupled high-efficiency blast wheel (German design with independent patents)
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
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.
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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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