I. Purpose of the QC698W Carbon Electrode Shot Blasting Machine
II. Main Technical Specifications
III. Composition and Structural Features of the Carbon Rod Cleaning Machine
IV. Working Process of the QC698W Shot Blasting Machine
V. Operating Sequence of Actuators for the QC698W Carbon Electrode Shot Blasting Machine
VI. Inspection Items and Standards
VII. Information on Purchased Components
VIII. Division of Responsibilities
IX. Scope of Supply for the QC698W Carbon Electrode Shot Blasting Machine
I. Application of the QC698W Carbon Electrode Shot Blasting Machine
1. The function of the QC698W carbon electrode shot blasting machine is to use high-speed steel shot to impact the surfaces of electrodes and nipples, thereby removing residual carbon or sand particles and achieving uniform cleaning. The treated products must meet the standard of removing 1.8–2.8 mm of base material from a single side (approximately 0–2% of the electrode weight) and having no adhered particles on the surface (in cases of severe localized adhesion, the standard is that no adhered material remains that can be dislodged by impact).
II. Main Technical Specifications
1. Carbon electrode specifications to be handled
（1）Length： 1850～3100mm
（2）Diameter： Φ300～Φ800mm
（3）Maximum weight per piece: 3000 kg/piece
2、 Workpiece conveying speed: 1–3 m/min (variable frequency speed control)
3、 Blast wheel
（1） Quantity: 3
（2） Model：H400
（3） Impeller diameter: 520 mm
（4） Shot Output: 3 × 350 kg/min
（5） Blast Velocity：78 m/s
（6） Motor Power：3*22kw
4、 Bucket ElevatorⅠ
（1） Elevator Capacity：120t/h
（2） Power：7.5kw
5、 Bucket ElevatorⅡ、Bucket ElevatorⅢ
（3） Elevator Capacity：85t/h
（4） Power：5.5kw
6、 Horizontal ScrewⅡ
（1） Conveying Capacity：75t/h
（2） Power：4kw
7、 Longitudinal / Horizontal Screw
（3） Conveying Capacity：70t/h
（4） Power：7.5(5.5)kw
8、 Magnetic Separator
（1） Primary & Secondary Separation Drums
Rotation Speed：36r/min
Diameter：314mm
Effective Length：600mm
（2） Screw Conveyor Power：1.5kw
（3） Magnetic Drum Power2*0.55KW
（4） Separation Screw Conveyor Capacity: 60 t/h
9、Dust Collection System
（1） Blasting Chamber：约15000 m3/h
（2） Bucket Elevator Ⅱ：2000 m3/h
（3） Air Separator：3000 m3/h
（4） Total Air Volume：20000m3/h
（5） High Pressure Fan: Model 9-26NO.11.2D, 30 kW
10、Single-side shot penetration depth of blasted carbon electrode: 1.8–2.8 mm
Note: Judged based on surfaces free of bonded particles. For areas with severe local adhesion, the standard is that no loose bonded residues can be brushed off the surface.
11、Shot Diameter in Use: φ1.2～φ2.5mm
12、Initial Shot Filling Quantity: 8,000 kg
13、Dust Blower
(1) Air Volume: Approx. 4,500 m³/h
(2) Air Pressure: 9,200 Pa
(3) Motor Power: 18.5 kW
Manufactured for Fangda Carbon Company
III. Composition and Structural Characteristics of the Machine
The shot blasting machine for carbon electrodes primarily consists of the following components (see the attached drawing):
☆ Blast chamber
☆ Large platform
☆ Air separator
☆ Bucket elevator (I, II, III)
☆ Dust removal system
☆ Abrasive separation system
☆ Longitudinal (transverse) screw conveyor
☆ Infeed roller conveyor
☆ Outfeed roller conveyor
☆ Shot blasting unit assembly
☆ Air blowing device
☆ Loading system
☆ Unloading system
☆ Electrical control system
☆ Magnetic separator
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
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.
......
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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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 |
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| 1 | Model | KJ-2230P15-16 | KJ-2028P11-14 |
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| 2 | Sorting configuration | Air separation |
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| 3 | Application | Shot blasting and derusting of large workpieces, profiles, and welded steel structures. |
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| 4 | Blast wheel type | German-style High-Performance HAI Shot Blasting Unit | American-style Pan-bagnat |
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| 5 | No. of blast wheel | 16 sets |
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| 6 | Blast wheel motor power | 11KW |
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| 7 | Roller spacing | φ280*1000 |
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| 8 | Load-bearing capacity (excluding fixtures) | ≤5吨 |
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| 9 | Dimensions of a single workpiece (width × height × length) | ≤2200*3000*14600mm |
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| 10 | Max entrance dimensions (width x height) in mm | 2400*3000mm |
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| 11 | Semi-automatic flow valve | 16 Sets |
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| 12 | Fully automatic flow valve | Optional |
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| 13 | Dry dust collector | QL-48 Filter Element (37 kW) |
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| 14 | Wet dust collector | Optional |
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| 15 | Airflow (m³/h) | ≤38000 |
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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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