Diesel pile hammer

Abstract

The invention relates to a diesel pile hammer ( 10 ) which comprises a cylinder ( 12 ), a piston ( 14 ) slidably mounted inside the cylinder ( 12 ), and an impact piece ( 16 ) slidably mounted inside the cylinder ( 12 ), said impact piece being arranged below the piston ( 14 ) in the operating position of the diesel pile hammer ( 10 ). A working compartment ( 32 ) is axially delimited by a face ( 36 ) of the impact piece ( 16 ) lying inside the cylinder ( 12 ) and a face ( 46 ) of the piston ( 14 ). A fuel supply device ( 52, 55, 62, 68 ) feeds a defined amount of fuel, especially diesel oil, to said working compartment with every working cycle. The fuel supply device ( 52, 55, 62, 68 ) is configured to inject the fuel into the working compartment ( 32 ) of the cylinder ( 12 ) optionally in a first mode of injection as an atomized fuel spray ( 76 ) or in a second mode of injection as a fuel jet ( 74 ) or in a third mode of injection both as an atomized fuel spray ( 76 ) and as a fuel jet ( 74 ).

1 . A diesel pile hammer comprising
 a cylinder,   a piston slidably guided in the cylinder,   an impact piece that is slidably guided in the cylinder and in the operating position of the diesel pile hammer is arranged below the piston,   a working compartment which is axially delimited by an end face, located inside the cylinder, of the impact piece and an end face of the piston,   a fuel supply device through which a predefined amount of fuel, can be introduced into the working compartment with every working cycle,   
     wherein
 the fuel supply device is constructed in such a way that the fuel is injected into the working compartment in a first mode of injection as an atomised fuel mist and in a second monde of injection as a fuel jet. 
 
   
   
       2 . The diesel pile hammer of  claim 1 , wherein the fuel supply device designed in such a way that the fuel mist of the first mode of injection flows into the working compartment in the vicinity of the end face of the impact piece substantially vertically to the direction of movement of the piston. 
   
   
       3 . The diesel pile hammer of  claim 1 , wherein the fuel supply device is designed in such a way that the fuel jet of the second mode of injection obliquely strikes the piston-side end face of the impact piece. 
   
   
       4 . The diesel pile hammer of  claim 1 , wherein the fuel supply device comprises at least one high pressure injection nozzle and at least one low-pressure injection nozzle, to which, via one pipe in each case and by way of at least one fuel pump, of which the inlet communicates with a fuel tank, the predefined amount of fuel can be supplied with every working cycle of the diesel pile hammer. 
   
   
       5 . The diesel pile hammer of  claim 4 , wherein at least one fuel pump of the fuel supply device is constructed in such a way that the amount of fuel supplied to a high-pressure injection device in each case and the amount of fuel supplied to a low-pressure injection device in each case can be adjusted. 
   
   
       6 . The diesel pile hammer of  claim 4 , wherein the fuel pump can be controlled or actuated by way of the dropping piston. 
   
   
       7 . The diesel pile hammer of  claim 4 , wherein the fuel supply device is constructed in such a way that it supplies the high-pressure injection nozzle with a minimum amount of fuel with every working cycle. 
   
   
       8 . The diesel pile hammer of  claim 1 , wherein the end face of the piston delimiting the working compartment is stepped by a circumferential, radially external step. 
   
   
       9 . The diesel pile hammer according to  claim 1 , wherein during a third mode of injection, the fuel is injected into the working compartment of the cylinder as both an atomised fuel mist and as a fuel jet. 
   
   
       10 . The diesel pile hammer of  claim 4 , wherein the predefined amount of fuel supplied with every working cycle of the diesel pile hammer is adjustable. 
   
   
       11 . The diesel pile hammer of  claim 2 , wherein the fuel supply device is designed in such a way that the fuel jet of the second mode of injection obliquely strikes the piston-side end face of the impact piece 
   
   
       12 . The diesel pile hammer of  claim 2 , wherein the fuel supply device comprises at least one high pressure injection nozzle and at least one low-pressure injection nozzle, to which, via one pipe in each case and by way of at least one fuel pump, of which the inlet communicates with a fuel tank the predefined amount of fuel can be supplied with every working cycle of the diesel pile hammer. 
   
   
       13 . The diesel pile hammer of  claim 3 , wherein the fuel supply device comprises at least one high pressure injection nozzle and at least one low-pressure injection nozzle, to which, via one pipe in each case and by way of at least one fuel pump, of which the inlet communicates with a fuel tank the predefined amount of fuel can be supplied with every working cycle of the diesel pile hammer. 
   
   
       14 . The diesel pile hammer of  claim 12 , wherein at least one fuel pump of the fuel supply device is constricted in such a way that the amount of fuel supplied to a high-pressure injection device in each case and the amount of fuel supplied to a low-pressure injection device in each case can be adjusted. 
   
   
       15 . The diesel pile hammer of  claim 5 , wherein the fuel pump can be controlled or actuated by way of the dropping piston. 
   
   
       16 . The diesel pile hammer of  claim 5 , wherein the fuel supply device is constructed in such a way that it supplies the high-pressure injection nozzle with a minimum amount of fuel with every working cycle. 
   
   
       17 . The diesel pile hammer of  claim 6 , wherein the fuel supply device is constricted in such a way that it supplies the high-pressure injection nozzle with a minimum amount of fuel with every working cycle. 
   
   
       18 . The diesel pile hammer of  claim 2 , wherein the end face of the piston delimiting the working compartment is stepped by a circumferential, radially external step. 
   
   
       19 . The diesel pile hammer of  claim 13 , wherein the end face of the piston delimiting the working compartment is stepped by a circumferential, radially external step. 
   
   
       20 . The diesel pile hammer of  claim 4 , wherein the end face of the piston delimiting the working compartment is stepped by a circumferential, radially external step.