Understanding PS Series Crusher Rotor Designs

The rotor is the heart of any crusher, determining cutting efficiency, particle size distribution, and throughput capacity. LVKESORT's PS series offers three distinct rotor configurations, each engineered for specific applications. Our crusher product page provides detailed specifications for each model.

V-Type Rotor (Standard Configuration)
The V-type rotor features two opposing knife edges forming a 60-degree angle, with the rotating blades cutting against a stationary bed knife. This creates a shearing action that efficiently processes medium-density materials with minimal dust generation. The symmetrical blade arrangement provides balanced operation with consistent cutting performance.

Step-Type Rotor (Thin-Wall Optimization)
The step-type rotor incorporates knives at varying heights, creating a graduated crushing sequence. Primary knives initiate size reduction on thick sections, while secondary knives at lower positions complete the process for thin sections. This staged approach prevents material from bypassing the cutting zone and dramatically reduces re-grinding cycles.

Flower-Type Rotor (Pipe and Profile Specialization)
The flower-type rotor distributes knives in a radial pattern resembling flower petals, with cutting edges extending outward from the rotor center. This configuration maximizes cutting points for tubular materials, preventing material wrapping and ensuring complete fragmentation of hollow profiles. The open structure also improves material flow for bulky items.

Material-to-Rotor Matching Guide

Proper rotor selection maximizes processing efficiency and extends blade life. The following guide, combined with our crusher selection guide, provides comprehensive material matching recommendations.

Screen Selection for Optimal Output

Screen selection determines both output particle size and throughput capacity. The screen consists of perforated steel plate with round, square, or slotted holes—the hole shape and size together control granule dimensions.

Screen Hole Size: Output particle diameter approximately equals hole diameter. Common sizes include:

• 6mm: Fine granules for injection molding re-grind
• 8mm: Standard granules for most recycling applications
• 10-12mm: Larger granules for extrusion or compounding
• 15-20mm: Coarse granules for further processing stages

Screen Thickness: Thicker screens resist deformation under high throughput but increase power consumption. Standard applications use 4-6mm thick screens; high-volume operations benefit from 8-10mm reinforced screens.

LP Series Vertical Crushers: When Vertical Configuration Makes Sense

In addition to horizontal PS series crushers, LVKESORT offers LP series vertical crushers designed for specific applications. Vertical crushers feed material from the top, allowing gravity to assist the crushing process and eliminating the need for feed conveyors.

LP Series Advantages:

• Compact footprint—ideal for limited floor space installations
• Gravity-assisted feeding reduces power consumption by 15-20%
• Direct feed from processing lines eliminates conveyors
• Ideal for sprues and runners directly from injection molding machines
• Closed design prevents material scatter during processing

The LP series excels in dedicated injection molding recycling cells where material flows directly from the molding machine into the crusher. Output falls by gravity into collection containers or transfer systems, minimizing material handling.

Crusher vs. Hammer Mill: Making the Right Choice

While the PS series crusher uses cutting knives for size reduction, hammer mills employ high-speed rotating hammers to impact and shatter material. Each technology offers distinct advantages depending on material characteristics and desired output.

Maintenance and Blade Care

Proper maintenance extends blade life and maintains consistent output quality. Regular inspection and timely blade replacement prevent quality degradation and unexpected downtime.

Daily Inspection: Check blade sharpness by observing output particle shape—dull blades produce elongated, fibrous particles rather than clean granules. Inspect for material buildup between blades and in the crushing chamber. Verify screen integrity and mounting security.

Weekly Maintenance: Clean the crushing chamber thoroughly to remove accumulated material. Check bearing temperatures and lubrication. Inspect belt tension and condition. Verify safety interlocks and emergency stop function.

Blade Replacement: Replace knives in complete sets to maintain rotor balance. Uneven blade wear causes vibration and bearing damage. LVKESORT offers sharpening services and replacement blade kits for all PS series models.

Selecting Your PS Series Configuration

PS series crushers are available in multiple sizes from 3HP to 50HP motor power, with crushing chamber dimensions scaling accordingly. For assistance selecting the optimal configuration for your application, contact LVKESORT engineering with your material specifications, throughput requirements, and available space constraints.

Our applications team provides free material testing using your actual waste streams, validating crusher performance before equipment commitment. This ensures the selected rotor type and screen configuration delivers expected results in your specific operating conditions.

Frequently Asked Questions

What is the difference between V-type and step-type crusher rotors?

V-type rotors feature knife edges arranged in a V-pattern configuration, with the rotor blade edge forming a 60-degree angle against the stationary knife. This design provides sharp initial cutting action ideal for general-purpose crushing of injection molded parts, purgings, and medium-density materials. Step-type rotors have staggered knife heights creating multiple cutting stages—larger knives initiate size reduction while smaller knives perform secondary crushing. This staged approach reduces impact stress on the machine and produces more uniform particle sizes, making it superior for thin-walled parts and delicate materials.

How do I choose the right screen size for my crusher?

Screen size determines the maximum particle dimension of output material. Select screen hole diameter based on your downstream requirements: 6-8mm screens produce fine granules for direct molding or extrusion, 10-12mm screens provide standard granules for general recycling, and 15-20mm screens generate coarser material suitable for further processing or bulk storage. Screen thickness should match expected throughput—thicker screens (6-10mm) resist deformation in high-volume operations, while thinner screens (3-4mm) suit lower-capacity applications. Always size screens conservatively during initial operation, then reduce screen size to increase throughput once process stability is confirmed.