Impact Crusher Wear Parts Foundry

Qiming Machinery is one of the largest impact crusher wear parts foundry in China. Qiming Machinery impact crusher wear parts provide the highest possible wear life combined with mechanical reliability and numerous mounting possibilities. Qiming Machinery impact crusher wear parts are developed and manufactured according to strict standards to meet the needs of the customer in the aggregates and mining industry. Impact crusher wear parts are weighted and balanced before the delivery to the customer.

Available for aggregates, cement, and mining industries, parts designed to improve efficiency and reduce costs by extending wear life and minimizing downtime. Impact crusher wear parts include:

  • Crusher Blow Bars
  • Impact Plates
  • Side Plates

Qiming Machinery proprietary alloys and innovative designs result in longer wear life compared to other OEM replacements.

Products

Manganese Steel Blow Bar
Manganese Steel Blow Bar
Chromium Steel Blow Bar
Chromium Steel Blow Bar
Ceramic Matrix Composites Blow Bar
Ceramic Matrix Composites Blow Bar
TIC Insert Blow Bar
TIC Insert Blow Bar

Patterns Available

Qiming Machinery’s blow bar patterns suit for those types of impact crushers:

  • NP Series
  • LT Series
  • MR Series
  • RM Series
  • APK Series
  • APS Series
  • Others

If you have other types of impact crushers, we also can supply measure the drawings service.

Benefits

Why Choose Qiming Machinery Impact Crusher Wear Parts?

  • Over 30 years of casting experience
  • Custom-fit for greater performance and easier replacement
  • More cheap price with better quality
  •  Design improvements increase crusher efficiency and prevent premature erosion
  • Large inventory of crusher wear parts in stock for immediate deliveries
  • Professional sales and after-sales to service for you
  • Hundreds Of Patterns. We currently have hundreds of blow bar patterns for many makes and models of horizontal shaft impactors. if you need a custom design, Our engineers and on-site pattern shop are skilled in producing new and customized blow bar designs to best suit the end user’s requirements.

What is impact crusher wear parts?

Blow Bars

Blow bars are the most important wear parts for impact crusher. Wear parts inserted into the rotor which impact
the rock to cause breakage. These can be replaced when they are worn down.

Rotor

This is the main part of the impact crusher. It holds the blow bars and rotates at a high speed, being driven by a pulley connected directly to the engine.

Apron Liners

Apron liners that are generally fitted to the end of aprons (which are replaceable wear parts) to ensure the apron settings can be maintained.

Side Liners

Sometimes called frame liners or impact plates, these are used on the inside of the impactor body to protect it from wear.

Aprons

Primary and Secondary aprons are used to reduce rock down to the required product size.

Influencing Factors on Blow Bar Wear

There are some factors which influence the wear of blow bars:

  • Feed material
  • Rotor speed
  • Moisture content
  • Fine content
  • Crusher ratio

The most important factor for blow bars wear is feed material.

Blow Bar Material Selection

Different working conditions need different material crusher blow bars to suit. Qiming Machinery supplies the following materials for impact crusher blow bars:

Manganese Steel Blow Bars

Manganese steel blow bars are commonly used primary crusher applications and provide high shock resistance and are available in both Mn14% and Mn18% material grades. They are well suited to applications where tramp iron is possible in the feed material. Manganese bars are often used as a ‘safe’ choice, however, other materials available can offer significant life costs benefits. The wear resistance of manganese steel with austenitic structure is attributable to the phenomenon of working hardening. The impact and pressure load results in a hardening of austenitic structure on the surface.

Martensitic Steel Blow Bars

Martensitic steel blow bar is one of the kinds of impact crusher blow bars. Martensitic Steel will be used whenever hardness and impact resistance are both needed, e.g. in primary and recycling applications. The martensite is a completely carbon-saturated type of iron by special heat treatment for improving the strength and wear properties, which lie between manganese steel and chrome steel. The steel hardness ranges from 53 to 58HRC and the impact strength is about 50J/cm2.

Chromium Steel Blow Bar

High chromium steel is widely used in casting impact crusher wear parts. The impact crusher wear parts include crusher blow bar and impact plate. As normal, Cr21 and Cr26 are used in casting crusher blow bars; the Cr15 material used in casting impact plate.

Ceramic Matrix Composites Blow Bar

Ceramic Matrix Composites Blow Bar is one of the normally impact crusher wear parts. Ceramic Matrix Composites Blow Bar include martensitic ceramic matrix composites blow bars and high chromium matrix composites blow bars.

Titanium Carbide Insert Blow Bars

Titanium carbide insert blow bars mean manganese steel or alloy steel as a matrix body, insert titanium carbide bars into the body. Under this design, the tic inserts blow bars span life more than other material. Titanium carbide insert blow bars are supplied by Qiming Machinery.

Blow bar material selection

Blow bar material selection

Blow Bars Selection

There are a few key points that you need to consider when selecting the correct blow bar for an application:

  1. Feed Material. The type of feed material can have a large impact due to the different abrasiveness of materials
  2. Uncrushable Material. This is material such as steel or rebar that can cause blow bar breakages.
  3. Feed Size. This has a direct link to what blow bars should be selected for each application.
Blow Bar TypeRecommended ForRecommended ForRisk Of Breakage
Martensitic
  • Primary blasted quarry rock
  • Buidling rubble & Concrete
  • Limestone
  • Larger feed sizes
High Abrasive MaterialVery large feed size
Chrome
  • Secondary Crushing
  • Smaller feed sizes
  • Abrasive Materials
Low Abrasive MaterialLarge feed size
Steel content
Martensitic
Ceramic
  • Asphalt
  • Natural stone
  • Building rubble & concrete
  • with small to medium iron
  • content
  • Medium Abrasive material
Low Abrasive MaterialLarge feed size
Chrome Ceramic
  • Secondary crushing with
  • natural stone
  • Asphalt in the case of small
  • feed size without any iron
  • content
Low Abrasive MaterialLarge feed size
Steel content
TIC Inserts
  • Primary blasted quarry rock
  • Building rubble & Concrete
  • Limestone
  • Larger feed sizes
High Abrasive MaterialTIC rods drop out

Some Blow Bars Working Problems and Solutions

There are many reasons why your impact crusher blow bars are breaking on a regular basis. We have compiled a list of the most common causes of blow bar failure and the solutions to those problems.

Excessive penetration on the blow bar

Excessive penetration on the blow bar

Problem: Excessive penetration on the blow bar

Causes:

  • The rotor speed is too slow.
  • Increases risk of blow bar breakage.
  • The blow bar is under-utilized before changing.
  • Increased rotor wear.

Solution:

  • Increase the rotor speed.
  • Change to 4 high blow bars.
Poor penetration on the blow bar means the top of blow bars is worn down flat

Poor penetration on the blow bar means the top of blow bars is worn down flat

 

Problem: Poor penetration on the blow bar means the top of blow bars is worn down flat.

Causes:

  • The rotor speed is too high.
    • Wear rates will be excessive.
    • Reduced output.
    • Creates a lot of fines

Solution:

  • Reduce the rotor speed.
  •  Change configuration to 2 high and 2 low blow bars.
Wear on the sides of the blow bar

Wear on the sides of the blow bar

Problem: Wear on the sides of the blow bar

Causes:

  • A high percentage of fines in the feed or overfeed causing fines to be pushed to outside.
  • Crusher chamber contaminated with caked material causing friction wear.

Solution:

  • Reduce speed of feeder so wear becomes even across the surface of the blow bar.
  • Clean chamber daily after each shift.
Blow bar wearing excessively to one side.

Blow bar wearing excessively to one side.

 

Problem: Blow bar wearing excessively to one side

Causes:

  • The machine on uneven ground – material falling to one side
  • The machine isn’t choke fed.
  • Feed dropped onto one side of feeder when using a recirculating option.

Solution:

  • Ensure the machine is on level ground.
  • Continuous loading.
Blow bar is damaged or broken

Blow bar is damaged or broken

Problem: Blow bar is damaged or broken.

Causes:

  • Incorrect blow bar for an application. (E.g. Chrome)
  • There is steel or rebar in the feed.
  • The feed size is too large.

Solution:

  • Select the correct blow bar.
  • Control feed size.
  • Remove steel or rebar.
Blow Bar Not Seating Against Rotor

Blow Bar Not Seating Against Rotor

Problem: Blow Bar Not Seating Against Rotor

Causes:

  • The rotor is not straight or needs to be rebuilt.
  • Blow bar is not straight, defective, or not properly machined to specs.
  • Blow bar could be pivoting, rocking on the locking mechanism, or there may be a fitting issue

Solution:

  • Select the correct blow bar.
  • Change the installation.
Worn and Cracked Rotor

Worn and Cracked Rotor

 

Problem: Worn and Cracked Rotor

Causes:

  • The rotor is not straight or needs to be rebuilt.
  • Blow bars material not suit

Solution:

  • Change to manganese blow bar.
  • This rotor needs to be replaced or rebuilt.
Lack of Blow Bar Support

Lack of Blow Bar Support

 

Problem: Lack of Blow Bar Support

Causes:

  • wedges not being used properly;
  • user was forcing old nuts/bolts under wedges to push them up instead of jacking bolts/ set screws.

Solution:

  • These wedges need to be replaced with new ones!
Loose Wedges

Loose Wedges

Problem:
The customer was experiencing breakage. When we went to the site, we found that the wedges were loose, causing the bar to move up in the rotor station, causing pressure on the locating nose. This pressure leads to a break in a blow bar. A new person was in charge of the crusher and did not realize they could loosen.

Solution:
A program was initiated to check wedge tightness a few hours after new blow bars were installed and at other intervals.