3 Differences between One and Two Shaft Shredder

When choosing an industrial shredder, the first question lots of the customers ask is what is the difference between single shaft shredder and double shaft shredder. One may not see the difference except their outlook, but they are very different in 3 points. In this article, we explain the differences between One shaft shredder and Two Shaft Shredder.

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Machine Structure

Single Shaft Shredder is equipped with only one shaft welded with rotary blades. The rotor a hydraulic-actuated pusher arm and a screen underneath the rotating shaft.

Double Shaft Shredder is built with two shafts of blades, which we also call dual shearing shafts. Its rotor consists of multiple disks of blades. The 2 rotors counter-rorate. There is no hydraulic-driven pusher or screen on this machine.

Application

Single Shaft Shredder is suitable to process thick and solid materials such as molding purgings, runners, sprues, plastic pallets, rubber rolls, wood lumbers, tree branches, bones, wood pallets, roll of films etc.

Double Shaft shredder excels in shredding large and relatively light or hollow products, such car/truck tires, film, plastic/steel drums, scrap TV/computer, scrap fax/printing machines, etc. Also, a mixture of the material streams like MSW can use double shaft shredder.

The output of both machines can go to secondary size reduction like granulator.

Operation Process

A single-shaft shredder, when the material is fed into the hopper, the pusher arm drives the material against the rotor, ensuring the material is efficiently in contact with and shredded by the rotary knives. The material will be repeatedly shredded till the shreds are small enough to pass throughput the screen. Therefore, you can get uniform output particles.

With a double shaft shredder, once the material is fed into the machine, the two shafts of cutting blades hook the material and then bite it until it’s fully broken down into pieces. No intervention of pusher ram or screen. The irregular sizes of shredded particles directly fall to the collection bin/conveyor.

Still don’t get 3 Differences between One Shaft Shredder and Two Shaft Shredder?

Wiscon Envirotech supplies shredding machines with various models of single shaft shredders and double shaft shredders to meet different needs. You are always welcome to inquire with us if you are not sure which type of shredder best fits your recycling needs. Differences between single shaft shredder and double Shaft Shredder is easy to understand.

Dual-shaft shredders have become the unsung heroes of waste management, recycling, and resource recovery industries. This blog post aims to delve into the diverse applications of dual-shaft shredders, the classification of their blades based on shape, the materials commonly used for these blades, and the meticulous steps required for their installation. Join us on a journey to understand the versatility and importance of dual-shaft shredders.

1. Application Industries and Fields:

Dual-shaft shredders, the workhorses of waste reduction, have found their place in a multitude of industries, each benefiting from their versatility and efficiency.

Waste Management: In the realm of urban waste, these machines shine. From household waste to industrial debris, dual-shaft shredders play a crucial role in reducing the volume of waste and preparing it for further processing.

Metal Recycling: Scrap yards and metal processing plants utilize dual-shaft shredders to break down metal components into manageable pieces, facilitating downstream recycling processes.

Plastic Processing: Plastics, notorious for their resilience, meet their match with dual-shaft shredders. These machines efficiently shred plastic materials, making them suitable for recycling or repurposing.

Wood Treatment: In the forestry and woodworking industries, dual-shaft shredders handle the formidable task of processing wood waste, and transforming it into usable materials or biomass.

Electronic Waste Disposal: The ever-growing e-waste problem requires specialized solutions. Dual-shaft shredders break down electronic components, ensuring secure disposal and facilitating material recovery.

2. Blade Classification by Shape:

The beating heart of any shredder lies in its blades. The shape of these blades is tailored to the specific challenges posed by different materials.

Shear Blades: Resembling giant scissors, shear blades excel at cutting soft materials like rubber and plastics.

Hook Blades: These blades, with their claw-like design, are adept at gripping and tearing through tough materials such as metals.

Tooth Blades: Featuring tooth-like structures, these blades efficiently tear through a variety of materials, making them versatile players in the shredding game.

Cross-Cut Blades: Blades are designed in a staggered arrangement to increase cutting efficiency and reduce power consumption for a wide range of material types.

Comb Blades: With comb-like teeth, these blades are designed for handling fibrous materials like paper and fabrics.

Understanding the nuances of blade shapes is key to optimizing shredder performance across various applications. In some dual-shaft shredders, a combination of blades may be used to meet the need to process different materials. Choosing the right type of blade is important to improve shredding efficiency and extend blade life.

3. How to choose dual-shaft shredder blade material:

The choice of blade material is akin to selecting the right tool for the job. When selecting blade materials, several aspects need consideration, typically including hardness, wear resistance, impact resistance, corrosion resistance, working environment temperature, and cost. Common materials include:

Alloy Steel: Known for its high hardness and wear resistance, alloy steel is a go-to option for processing metals and moderate-hard plastics.

Tool Steel: Renowned for its hardness and wear resistance, tool steel finds applications in processing metals and hard plastics.

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Stainless Steel: Recognized for its corrosion resistance, stainless steel is indispensable when dealing with corrosive materials such as food containers.

Hard Alloy: Characterized by superior hardness and wear resistance, hard alloy blades tackle high-hardness materials like old tires and metals.

High-Speed Steel: Ideal for high-speed shredding operations, high-speed steel offers excellent wear resistance and temperature performance.

Recommendations for different industries:

Metal Recycling: Alloy steel and high-speed steel blades are highly recommended for efficiently processing metal components.

Plastic Processing: Tool steel and alloy steel blades are well-suited for shredding various types of plastics.

Wood Treatment: Alloy steel blades, with their durability, are ideal for breaking down wood waste.

Electronic Waste Disposal: Stainless steel blades, resistant to corrosion, are crucial for handling electronic components.

The choice of blade material typically needs adjustments based on specific applications and production environments. In some cases, a combination of different materials in the blades may be necessary to meet the requirements of processing materials with different properties. When making these choices, it’s advisable to consult with Nanjing Metal industrial professional engineer to ensure that the blade material aligns with practical needs.

4. Installation Steps and Points of Attention:

Installing dual-shaft shredder blades is a meticulous process that ensures the machine operates at peak efficiency. Here’s a step-by-step guide:

Preparation: Prioritize safety by turning off the machine and gathering the necessary tools.

Blade Removal: If replacing blades, carefully remove the old ones, potentially involving the disassembly of covers or protective shields.

Clean Workspace: Ensure a clean workspace, removing any potential obstacles or debris that may hinder the installation process.

Blade Positioning: Refer to manufacturer guidelines or blueprints to determine the correct placement of new blades. Pay attention to orientation and direction.

Blade Installation: Affix the new blades onto the shafts, using bolts or other fasteners. Ensure a secure and stable attachment to prevent loosening during operation.

Clearance Adjustment: Depending on requirements, adjust the clearance between blades. Precision in this step is critical for optimal performance.

Blade Fixation: Secure the blades firmly to the shafts using appropriate fasteners, preventing any unintended movement.

Protective Cover Replacement: If removed, reinstall covers or protective shields, ensuring they are correctly in place to safeguard the blades.

Inspection: Conduct a thorough inspection of the blade installation, ensuring no loose components or irregularities are present.

Test Run: Perform a brief test run in real production conditions, verifying that the blades function correctly without abnormal vibrations or noises

Notes:

Safety First: Maintain safety throughout the entire installation process. Use appropriate personal protective equipment, ensure the equipment is in a shutdown state, and adhere to relevant safety regulations.

Follow Manufacturer’s Guidance: Strictly follow the installation guidelines or manual provided by the manufacturer. Different models of dual-shaft shredders may have varying installation requirements.

Tool Usage: Utilize proper tools for blade installation to ensure secure attachment without causing damage to the blades.

Regular Maintenance: Periodically inspect the condition of the blades, ensuring they are in optimal working conditions. Depending on usage, regularly replace worn-out blades.

Blade Compatibility: Use blades that are compatible with the equipment, ensuring that the specifications and dimensions of the blades align with the manufacturer’s recommendations.

Dual-shaft shredders stand at the forefront of waste management and recycling solutions, offering versatility and efficiency. Selecting the right blade material and mastering the installation process is critical for ensuring the seamless operation of these powerful machines. By understanding the nuances explored in this blog post, we can harness the potential of dual-shaft shredders and contribute to sustainable development and environmental conservation.

About METAL Industrial

Nanjing Metal Industrial CO., Limited is a manufacturer of mechanical blades from China, producing blades and accessories for industries including metalworking, converting, food, and more. We have more than 15 years of experience in the manufacture and sales of industrial machine blades, machine parts, and regrinding services. We invite you to experience the superior quality of production.

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