01Limestone and Dolomite Quarries
First-stage coarse crushing of medium-hard quarry rock such as limestone and dolomite. The feed opening is sized for the largest lump.
Mining and Mineral ProcessingPrimary Impact Crusher – First-Stage Crusher with Blow Bars
PRO MAKINA · Primary Impact Crusher
- Crushing principle
- Blow bar impact and aprons
- Stage
- First stage (coarse crushing)
- Material
- Medium-hard, low-abrasive rock and debris
- Wear parts
- Blow bars and liners
Overview
Coarse Crushing of Large Material by Impact
A primary impact crusher is an impact crusher with a heavy rotor on a horizontal shaft fitted with blow bars. Coarse material entering the large feed opening is broken by the blow bars and thrown against impact aprons in the housing, where it breaks again.
Its task is to reduce coarse material from the quarry or demolition site to a size that secondary crushers and screens can handle. The product is coarse with a wide distribution; secondary crushing and screening are needed for the final size.
Because it crushes by impact, it suits medium-hard, low-abrasive materials such as limestone, dolomite and concrete debris. For hard and highly abrasive rock, a jaw crusher is usually the better first-stage solution.
01Process Flow
Primary Impact Crusher Material Flow
The diagram shows the typical flow in which the primary crusher takes coarse material from the feeder, crushes it coarsely and sends it to the second stage. Feeder, screening and secondary crushing are separate equipment.
Scroll horizontally to view the full diagram.
Material line
- 1
Coarse feed: Quarry rock or debris is fed to the crusher opening by a feeder.
- 2
Crushing by blow bars: Blow bars on the rotating rotor strike and break the material.
- 3
Breaking on aprons: Thrown pieces hit the impact aprons in the housing and are reduced.
- 4
Discharge for secondary processing: Coarsely crushed product goes to screening or the second-stage crusher.
The primary crusher output is not the final product; it usually goes to screening and a secondary crusher.
02Applications
Primary Impact Crusher Applications
01
02Demolition and Concrete Recycling
Pre-crushing concrete and construction debris in recycling lines. Rebar and contaminants are removed by separation equipment in the line.
Recycling and Waste Management
03Design & Manufacturing
Custom Primary Impact Crusher Design and Manufacturing
PRO MAKINA engineers primary crushers around the largest feed size, material hardness, capacity and the following crushing stage. Rotor and blow bars, impact aprons and adjustment, housing, flywheel, drive and hydraulic opening are designed together.
- Large feed opening and heavy rotor
- Replaceable blow bars
- Adjustable impact aprons
- Hydraulically opening housing
Process Design Data
- 01
Feed
Largest lump size, feeding method and pre-screening.
- 02
Material
Hardness, abrasiveness, moisture and clay content.
- 03
Pre-Crushing Size
Coarse product size suitable for the secondary stage.
- 04
Rotor and Blow Bars
Rotor size and mass, number and material of blow bars.
- 05
Maintenance and Integration
Hydraulic opening, blow bar replacement and link to the secondary crusher.
Rotor speed, power and capacity are defined from material and line data; the primary crusher product is not considered final size.
04Gallery
Primary Impact Crusher Photo Gallery
05FAQ
Primary Impact Crusher FAQ
How does a primary impact crusher work?
Blow bars on a rotor spinning on a horizontal shaft strike the material; pieces are thrown against impact aprons and broken again, and coarse product leaves at the bottom.
What does 'blade' refer to in this crusher?
It refers to the blow bars mounted on the rotor that break material by impact; it is not a cutting knife.
Is the primary crusher product at final size?
No. The primary crusher reduces coarse material to a rough size; screening and secondary crushing are needed for the final size.
Which materials is it suitable for?
Medium-hard, low-abrasive materials such as limestone, dolomite and concrete debris. For hard and abrasive rock, a jaw crusher is assessed.
What information is needed for a quotation?
Material type, hardness and abrasiveness, largest feed size, required pre-crushing size and hourly capacity.
06Resources
Related Machines and Plants
Secondary Impact CrusherSecond-stage impact crushing of pre-crushed material.Jaw CrusherPrimary crushing of coarse material between a fixed and a moving jaw.Vertical Shaft Impact CrusherCrushing by impact after acceleration in a vertical shaft rotor.Screening SystemsSeparating bulk material by particle size.
Related machine groups:Screening SystemsConveying SystemsSilos & Feeding SystemsDust Collection Systems
Technical Quotation
Request a technical quotation for a primary impact crusher
Share your material, largest feed size and next crushing stage, and we will define the primary crusher together with you.
Information Needed for a Technical Quotation
- Material type and hardness
- Abrasiveness, moisture and clay content
- Largest feed size
- Required pre-crushing size
- Hourly capacity (t/h)
- Next crushing and screening stage