Constant Blow Energy - CBE

Concept - Piston strikes the tool with constant force on each blow.

Variables: Impact Frequency - Bpm Pressure Adjusting Valve - PAV Back pressure

Constant Blow Energy Design

Stress wave

Constant Blow Energy Design

Impact Frequency (speed) :

Determined by amount of oil flow to the hammer.

Variables influencing speed:Operating procedure.Hardness of the material to be broken.

Frequency -bpm

Oil flow - gpm

Maximum oil flow for hammer

Constant Blow Energy Design

Low Pressure Circuit

Transfers stored energy from accumulator to piston shoulder during down stroke.

Primed at start up by inlet oil.

Independent circuit regulated by Pressure Adjusting Valve.

Constant Blow Energy Design

Regulates power thru the low pressure circuit for maintaining a constant blow.

Adjusted with shims.

Acts as a pressure reducing valve on low pressure circuit.

Pressure Adjusting Valve(PAV)

Hammer operating pressure range

Hammer operating pressure curve

Pressure(psi)

Oil flow - gpm

Min Max

Max

Min

SpringSpool

Back pressure:

Note:An increase of 1 bar backpressure increase operatingpressure by 1 bar. [1 bar = 14.5 psi]

Low pressure circuit

Backpressure

Operating pressure

Constant Blow Energy Design

Inlet

Outlet

Created by return line routing to tank.

Creates resisting force on top of piston.

Increases hammer operating pressure.

Inlet pressurelow psi circuittank