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How to Select and Use Hydraulic Rock Breaker Chisel Tools Correctly?
2014-04-11
Key words:hydraulic rock breaker,hydraulic hammer tool,rock breaker chisel
Digest:
1. Selection of the hydraulic rock hammer working tool
Pyramid Point - for use where increased breakout forces are required
Chisel/Wedge – same as the above, but also where a cutting action is required, such as benching and trenching.
Blunt - for impact breaking, secondary breaking and also scaling in mines and tunnels.
1. Selection of the hydraulic rock hammer working tool
Pyramid Point - for use where increased breakout forces are required
Chisel/Wedge – same as the above, but also where a cutting action is required, such as benching and trenching.
Blunt - for impact breaking, secondary breaking and also scaling in mines and tunnels.
2. Correct use of the hydraulic breaker tool
90˚ Working angle
Critical to tool life is using the tool at the correct working angle of 90˚ to the working surface. Failure to do this will result in high contact pressure between the hydraulic breaker tool and the bushings and the likelihood of galling between the surfaces. In turn this can lead to premature failure of the tool plus damage and rapid wear to the bushings. Worn bushings can allow the tool to be angled over to a position where the striking face is hit at an angle by the piston.
Lubrication
Lubrication of the tool/bushing with the correct quality high temperature/high pressure grease at regular intervals is essential. Such greases are best able to cope with the extreme contact pressures generated by an incorrect working angle, leverage and excessive bending etc.
Blank Striking
Continuing to use the rock hammer when the hydraulic breaker chisel tool is not or only partially in contact with the work surface will result in the tool being fired down on the retainer pin. This will cause heavy wear and damage to the uper retainer flat radius area and the retaining pin itself. Tools should be examined regularly, eg. every 40 hours for damage in this area should then be ground out. At the same time we check the tool bushings for wear and damage,looking to replace or repair as necessary.
Overheating
Avoid continuous striking in one position. Do not strike in one spot for more than 10-15 seconds before changing the hydraulic breaker tool to another position. Or it can lead to excessive heat build-up at the working end with ‘mushrooming’ as a consequence.
Leverage/Bending
Using the tool as a lever to help break the ground is a common tool breaker. Avoid leverage and excessive bending at all times.
Thrust&outer bushing worn
If thrust&outer bushing wear greatly, deviated striking will be caused under this circumstance,the hydraulic rock breaker tool will become loose after installation ,it will be hard to work in straight or correct angle. the piston will hit the chisel unevenly, which will lead to the partial crack of the piston or tool.
Tool Reconditioning
Under most normal circumstance the rock breaker tool will not need reconditioning. However tools that have lost their shape on the working
end can cause high stresses throughout the tool and hydraulic hammer. Reconditioning by milling or turning is recommended.
Welding or flame cutting is not recommended as the heat generated could cause structural changes within the material which in turn can lead to premature failure or rapid wear.
Pyramid Point - for use where increased breakout forces are required
Chisel/Wedge – same as the above, but also where a cutting action is required, such as benching and trenching.
Blunt - for impact breaking, secondary breaking and also scaling in mines and tunnels.
2. Correct use of the hydraulic breaker tool
90˚ Working angle
Critical to tool life is using the tool at the correct working angle of 90˚ to the working surface. Failure to do this will result in high contact pressure between the hydraulic breaker tool and the bushings and the likelihood of galling between the surfaces. In turn this can lead to premature failure of the tool plus damage and rapid wear to the bushings. Worn bushings can allow the tool to be angled over to a position where the striking face is hit at an angle by the piston.
Lubrication
Lubrication of the tool/bushing with the correct quality high temperature/high pressure grease at regular intervals is essential. Such greases are best able to cope with the extreme contact pressures generated by an incorrect working angle, leverage and excessive bending etc.
Blank Striking
Continuing to use the rock hammer when the hydraulic breaker chisel tool is not or only partially in contact with the work surface will result in the tool being fired down on the retainer pin. This will cause heavy wear and damage to the uper retainer flat radius area and the retaining pin itself. Tools should be examined regularly, eg. every 40 hours for damage in this area should then be ground out. At the same time we check the tool bushings for wear and damage,looking to replace or repair as necessary.
Overheating
Avoid continuous striking in one position. Do not strike in one spot for more than 10-15 seconds before changing the hydraulic breaker tool to another position. Or it can lead to excessive heat build-up at the working end with ‘mushrooming’ as a consequence.
Leverage/Bending
Using the tool as a lever to help break the ground is a common tool breaker. Avoid leverage and excessive bending at all times.
Thrust&outer bushing worn
If thrust&outer bushing wear greatly, deviated striking will be caused under this circumstance,the hydraulic rock breaker tool will become loose after installation ,it will be hard to work in straight or correct angle. the piston will hit the chisel unevenly, which will lead to the partial crack of the piston or tool.
Tool Reconditioning
Under most normal circumstance the rock breaker tool will not need reconditioning. However tools that have lost their shape on the working
end can cause high stresses throughout the tool and hydraulic hammer. Reconditioning by milling or turning is recommended.
Welding or flame cutting is not recommended as the heat generated could cause structural changes within the material which in turn can lead to premature failure or rapid wear.
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