Rebar/Axle Shot Blasting Machine

Product Overview

In the operation of the KEEJOO Group roller-conveyor shot blasting machine for wire rods and rebar, an electrically controlled, variable-speed roller conveyor feeds steel components or stock into the blasting zone within the machine's chamber. Here, all surfaces are subjected to intense, concentrated abrasive impact and friction from multiple angles, rapidly removing mill scale, rust, and contaminants to produce a clean surface with a specific roughness profile; workpieces are loaded and unloaded on the roller conveyors extending from the chamber's inlet and outlet. A blow-off system removes abrasive media and rust dust from the steel surface; 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 it to the separator at the top of the machine. Cleaned abrasive media falls into the separator hopper for recirculation, while dust generated during the process is drawn into a dust collection system; particulate dust is captured, and the purified air is exhausted into the atmosphere.

Applications cover a wide range of products, including steel plates, steel strips, weighing equipment, trailer axles, vehicle 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 plates, coiled sheets, iron towers, and rebar.

The rebar descaling machine is a type of shot-blasting equipment designed to remove rust from metal surfaces and strengthen the material. It effectively eliminates rust, residual welding slag, and oxide layers, restoring the steel to its original smooth finish and maintaining the metal's luster and cleanliness, thereby facilitating subsequent processes such as decorative coating or anti-corrosion treatment.

Working Principle of Rebar Rust Removal Machine

As round steel bars and pipes are automatically fed into the blast zone of the cleaning chamber, they rotate while advancing, continuously subjected to the impact and abrasion of high-speed abrasive streams projected longitudinally. This action rapidly removes mill scale, rust layers, and foreign matter, revealing the underlying metal surface. Workpieces are loaded and unloaded on roller conveyors at either end of the chamber. During the cleaning process, the mixture of spent abrasive and dust falls through the chamber hopper and is gathered by longitudinal and transverse screw conveyors at the base of the elevator; it is then lifted to a separator at the top of the machine. Reusable abrasive is separated and returned to the hopper for recycling by the blast wheels, while dust generated during the process is conveyed to the dust collection system, where purified air is vented to the atmosphere and particulate dust is captured.

Introduction to Advantages

    The rebar descaling machine utilizes a roller-conveyor, pass-through operating principle, enhancing the equipment's continuous processing capability. It combines advantages such as being acid-free, eco-friendly, energy-efficient, highly productive, and easy to operate. Its primary function is the non-acid removal of scale, oil, and rust from the wire rod surface, ensuring a high-quality finish. Additionally, the process relieves internal stress, improves surface fatigue resistance, and extends service life, thereby eliminating the environmental pollution and health hazards associated with traditional acid-based descaling methods.

     The successful development of the rebar shot-blasting machine by Qingdao KEEJOO Group has transformed the situation for fastener manufacturers who previously failed environmental impact assessments due to intractable pollution—affecting air and groundwater—caused by long-term reliance on acid pickling for rust removal.

Key advantages

The shot blasting chamber features full manganese steel liners with a service life of 5–10 years; it utilizes an advanced Venturi wet dust collection system, a two-stage abrasive separation system, and high-performance blast wheels (offering superior cleaning efficiency and low abrasive consumption); it is equipped with a steel shot flow control system, a variable-frequency drive (VFD) roller conveyor system, and a comprehensive separation system combining mechanical sorting, transverse screw separation, and air separation.

Before-and-after comparison of the cleanup

Working Principle

The Qingdao KEEJOO Group roller-conveyor shot blasting machine enables continuous operation, performing descaling, cleaning, and pre-treatment on various steel materials—such as plates, structural sections, beams, profiles, pipes, and castings—via a continuous pass-through process. Operation is simple: the material is loaded onto the machine and the start button is pressed; following a brief cycle, the system automatically unloads the processed material, completing the cleaning process and removing all dust and residual shot. During operation, an electrically controlled, variable-speed roller conveyor transports the steel components or materials into the blasting zone within the machine's chamber. Here, all surfaces are subjected to intense, concentrated bombardment and abrasion by abrasive shot from multiple angles, rapidly removing mill scale, rust, and contaminants to produce a clean surface with a specific roughness profile. Workpieces are loaded and unloaded on the roller conveyors at the inlet and outlet ends of the chamber. A blow-off system removes shot and rust dust from the steel surface; 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 falls into the separator hopper for recirculation, while dust generated during the process is drawn into a dust collection system; purified air is exhausted into the atmosphere, and particulate dust is captured and collected.

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.

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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

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.

Introduction to Specifications for Pass-through Shot Blasting Machines