Jaw crusher, model 800
Product Name:Jaw crusher type 800 (abbreviated as: jaw crusher)
Model number explanation:"800" usually refers to itsThe width of the feed inlet is 800 mm.(e.g., 800×1000mm) is a key parameter for measuring the maximum size of materials it can handle.
Product positioning:In the crushing and washing line, targeting"Extra-hard, extra-large, and extra-tough" plastics or composite materialsofPre-crushing or dedicated crushing equipmentIt is not a universal solution, but rather a solution for specific problems.Special tools。
I. Core Functions and Special Application Scenarios
In conventional plastic recycling, hammer mills and shear mills are more efficient for flexible films and bottles. The core value of a jaw crusher lies in its…"Huge extrusion pressure" and "Reliable feeding capacity"Applicable to:
Primary fragmentation of a giant hard plastic:likeLarge solid PE/PP plastic cutting boards, giant nylon gears, and extra-thick engineering plastic sheets (over 50mm thick).These materials may overload or damage a conventional hammer crusher.
Preliminary dissociation of plastic-metal composites:likeLarge plastic components with numerous embedded metal parts (car bumpers with brackets, electrical appliance housings with frames).The powerful extrusion force of the jaw crusher can break it into larger pieces, loosening the plastic and metal parts, which facilitates subsequent manual or mechanical sorting, as well as magnetic separation to remove the metal.
Handling of extremely tough materials:someUltra-high molecular weight polyethylene (UHMW-PE) or reinforced nylonThe material is extremely tough and has poor shear and impact crushing effects, but it can be effectively broken by continuous compression using a jaw crusher.
Pre-crushing before shredding:Before entering the twin-shaft shredder for fine shredding, materials that are too large are "necked" to protect the shredder blades and improve system efficiency.
II. Main Structure and Working Principle
1. Core structural components:
Rugged rack:The integral heavy-duty welded steel plate frame or cast steel frame can withstand huge crushing reaction forces.
Fixed jaw plate and movable jaw plate:Core working component. (Made by...)Ultra-high manganese steel (ZGMn13) or other wear-resistant alloysMade of materials with a serrated surface to enhance chewing and friction.
Eccentric shaft and moving jaw assembly:The motor is driven by a V-belt.Heavy eccentric shaftRotate, drivemovable jaw plateIt performs periodic reciprocating movements, forming a "chewing" crushing action with the fixed jaw plate.
Adjustment device:Controlled by adjusting the wedge or shim mechanism.Discharge port sizeThis determines the final particle size range of the material after crushing.
Flywheel and pulley:The flywheels at both ends of the eccentric shaft store energy, ensuring a uniform load and stable operation during the crushing process.
Elbow plate (thrust plate):It is both a transmission component andSafety devicesWhen an uncrushable object (such as a large metal block) enters, the toggle plate will break first, protecting the core components from damage.
2. Working principle (compression crushing):
Material falls into the crushing chamber from the top feed inlet → The movable jaw plate periodically moves closer to and further away from the fixed jaw plate → When it moves closer, it generates pressure on the material inside the chamber.Enormous compression, bending and splitting forcesThis causes the material to break down. Under the influence of gravity, the broken material falls as the jaw plate moves backward with each movement. Material smaller than the discharge opening is discharged, while material larger than the discharge opening continues to be squeezed until it reaches the discharge standard.
III. Analysis of Core Product Features and Advantages/Disadvantages
Advantages:
Simple structure, sturdy and durable:It features a classic design, low failure rate, and relatively easy maintenance.
Strong ability to handle oversized materials:It can directly feed in giant blocks of material that are close to the size of the feed inlet.
Immense crushing force:Applicable toExtremely high hardness and high strength brittle or tough plastics。
The discharge particle size is adjustable.The output particle size can be changed through mechanical adjustments, with a wide range of possibilities.
Relatively high tolerance for metallic impurities:When encountering unbreakable metal, there is an elbow plate as mechanical overload protection.
Disadvantages (in plastic washing lines):
The output is relatively low and the efficiency is not high.It operates intermittently, and the output of plastic processed per unit of energy consumption is far lower than that of hammer or shear pumps.
The crushing ratio is small, resulting in uneven output particle size.The output is mostly in the form of flakes or blocks, with a wide particle size distribution, and may include a large number of long strips.It is not conducive to subsequent uniform cleaning and friction.。
It easily generates dust:The extrusion process easily generates fine powder, making it unsuitable for food-grade recycling with high cleanliness requirements.
Not applicable to soft materials and films:Soft plastic can slip or compact between the jaw plates, making it difficult to break up effectively and even causing blockages.
There is considerable noise and vibration.
IV. Key Application Scenarios and Technical Parameters (Examples)
Non-standard applicable materials:
Large plastic parts (with metal) from scrapped cars
Extra-thick engineering plastic blocks, sheets, and rods in industrial waste
Discarded plastic inspection wells and large plastic containers
Composite plastic pallet (with steel frame)
Technical parameters (example):
model:PE-800×1000
Inlet size: 800×1000 mm
Maximum feed edge length: ≤ 650 mm
Discharge port adjustment range:100-200 mm (approximate range of output particle size)
Processing capacity: 150-300 t/h（Note: This is a theoretical value. When processing plastics, due to their low density and low filler content, the actual output will be significantly reduced, possibly to only 10-50 tons/hour.）
Main motor power: 90-110 kW
Equipment weight:Approximately 15-20 tons
V. Special Position and Synergy in the Crushing and Washing Line
Appears only in specific configurations:
Heavy-duty feeding (e.g., grab bucket) → Jaw crusher 800 (pre-crushing/dissociation) → Magnetic separator (removal of dissociated metal) → Hammer or shear crusher (secondary fine crushing) → …enter the regular cleaning process
Key points of collaboration:
It is not the end, but the beginning:After jaw rupturemustThe subsequent crushing equipment will crush the large pieces of material to a size suitable for washing.
Enhanced iron removal:A powerful iron remover must then be installed to remove the metal impurities that have been separated due to compression.
Careful assessment:In the vast majority of PET bottle flakes, films, and appliance casing recycling linesUsing a jaw fracture is incorrect and uneconomical.。
VI. Selection and Operational Warnings
Extremely cautious product selection:Jaw crushers should only be considered when the material is confirmed to be "extra-large, hard, and tough" and cannot be effectively handled by other crushing equipment.
Its limitations are clearly defined:Accept the reality that it is less efficient, has uneven output, and may require secondary crushing.
Operation and maintenance:
Metal blocks are strictly prohibited from entering.
Regularly check the wear of the jaw plates and turn them around or replace them in time to ensure production capacity and particle size.
Pay attention to lubricating the eccentric shaft bearing; this is a crucial maintenance point.
