Arrangement in rock drilling machine and method of mounting rock drilling machine

Abstract

An arrangement in a rock drilling machine and to a method of mounting the same, the rock drilling machine including a gear module and a percussion module, which are arranged on a same axial line. The modules are pressed towards each other by several first connecting devices and several second connecting devices. The connecting devices generate first axial connecting forces and second axial connecting forces, which receive axial operational forces of the rock drilling machine. The second connecting devices also fasten the rock drilling machine to a carriage provided with support surfaces.

1 . An arrangement in a rock drilling machine comprising:
 a rock drilling machine including a gear module located at a front end portion of the rock drilling machine and a percussion module located at a rear end portion of the rock drilling machine, the gear module and the percussion module being located on a same axial line, wherein a body of the gear module includes a first axial joint surface facing towards the rear end portion of the rock drilling machine, and whereby a body of the percussion module includes a second axial joint surface facing towards the front end portion of the rock drilling machine;   connecting devices arranged to connect the gear module and the percussion module; and   a carriage movably supported by a feed beam and including a body part, the body part being an elongated element arranged longitudinally relative to the rock drilling machine, the carriage further including two transverse fastenings lugs located at a transverse distance from each other and being provided with axial first support surfaces for connecting the rock drilling machine to the carriage, the percussion module being located between the fastening lugs at a longitudinal central line of the carriage; and   the connecting means including a plurality of first connecting devices and a plurality of second connecting devices, wherein the first connecting devices generate a first connecting force for pressing the first axial joint surface of the gear module and the second axial joint surface of the percussion module towards each other and the second connecting devices generate a second connecting force (F 2 ) for pressing the first axial joint surface ( 21 ) of the gear module ( 13 ) and the second axial joint surface ( 22 ) of the percussion module ( 15 ) towards each other, and which second connecting force (F 2 ) is configured to fasten the gear module ( 13 ) and the percussion module ( 15 ) to the axial first support surfaces ( 28 ) of the carriage ( 5 ). connecting force for pressing the first axial joint surface of the gear module and the second axial joint surface of the percussion module towards each other, the second connecting force being configured to fasten the gear module and the percussion module to the axial first support surfaces of the carriage.   
     
     
         2 . The arrangement as claimed in  claim 1 , wherein the axial first support surfaces of the carriage face towards the front end portion of the rock drilling machine, the percussion module including axial second support surfaces facing towards the rear end portion of the rock drilling machine, the the axial first support surfaces and the axial second support surfaces being pressed towards each other under influence of the second connecting force. 
     
     
         3 . The arrangement as claimed in  claim 1 , wherein the first connecting devices are axially directed first connecting bolts and the second connecting devices are axially directed second connecting bolts, the first connecting bolts being located at a shorter distance from a central line of the rock drilling machine compared to the second connecting bolts, whereby the first connecting bolts and the second connecting bolts are located at different positions relative to each other. 
     
     
         4 . The arrangement as claimed in  claim 1 , wherein the first connecting devices are axially directed first connecting bolts and the second connecting devices are axially directed second connecting bolts, the first axial joint surface of the gear module includes several blind holes provided with connection threads, the first connecting bolts being pin bolts connected to the blind holes, the second axial joint surface of the percussion module including several through holes through which the pin bolts, outer ends of the pin bolts being provided with tightening nuts for generating the first connecting force the arrangement further including several axial through holes passing through the first connecting surface of the gear module, the second connecting surface of the percussion module and the first support surfaces of the carriage, the second connecting bolts being configured to pass through the axial through holes and to generate the second connecting force. 
     
     
         5 . The arrangement as claimed in  claim 1 , wherein the opposing first axial joint surface of the gear module and the second axial joint surface of the percussion module are arranged directly against to each other, the opposing joint surfaces being pressed against each other by the first connecting forces and second connecting forces. 
     
     
         6 . The arrangement as claimed in  claim 1 , further comprising at least one intermediate element arranged between the gear module and the percussion module, the intermediate element including third axial joint surfaces facing towards the gear module and fourth axial joint surfaces facing towards the percussion module, wherein the first joint surfaces and the third joint surfaces are arranged against each other, and correspondingly the second joint surfaces and the fourth joint surfaces are arranged against each other, and are pressed against each other by the first and second connecting forces. 
     
     
         7 . The arrangement as claimed in  claim 1 , wherein the rear end portion of the gear module includes a first connecting flange provided with the first axial joint surfaces, the body of the percussion module being cylinder-shaped and the front end port of the body of the percussion module including a second connecting flange provided with the second axial joint surfaces, the second connecting means being connecting bolts located at a transverse distance from an outer line passing along an outer surface of the cylindrical-shaped body part. 
     
     
         8 . The arrangement as claimed in  claim 1 , wherein the axial support surfaces face towards the front end portion of the rock drilling machine. 
     
     
         9 . The arrangement as claimed in  claim 1 , wherein the gear module includes an axial shank, the rock drilling machine including an axial bearing module having at least one axial piston, which is axially movable and is configured to affect to axial position of the shank, the axial bearing module being located at the front end portion of the percussion module, and the operation of the axial bearing module being configured to generate an axial force directed towards the front end of the rock drilling machine, whereby the force is arranged to push the gear module away from the percussion module, and wherein the first connecting devices and the second connecting devices are configured to receive the axial forces caused by the operational forces of the axial bearing module. 
     
     
         10 . The arrangement as claimed in  claim 6 , further comprising at least one intermediate element arranged between the gear module and the percussion module, the gear module including an axial shank, wherein the rock drilling machine includes an axial bearing module having at least one axial piston, which is axially movable and is configured to affect to axial position of the shank, the axial bearing module being located inside the intermediate element, and the operation of the axial bearing module being configured to generate an axial force directed towards the front end of the rock drilling machine, the force being arranged to push the gear module away from the intermediate element, and wherein the first connecting force and the second connecting force are configured to receive the operational forces of the axial bearing module and to prevent the axial joint surfaces from being separated. 
     
     
         11 . The arrangement as claimed in  claim 1 , wherein the body of the percussion module is an elongated cylindrically shaped piece having a transversal connecting flange at the front end portion of the percussion module, and the connecting flange is provided with the axial second joint surfaces, the rear end of the body of the percussion module being provided with a rear cover. 
     
     
         12 . The arrangement as claimed in  claim 1 , wherein the percussion module includes a percussion piston supported inside the body of the percussion module, the percussion piston being arranged to move axially in an impact direction towards the front end portion of the rock drilling machine and correspondingly in a return direction towards the rear end portion, an inside of the gear module being a shank supported by a body of the gear module, the gear module including a gear transmission for transmitting rotation torque to the shank in order to rotate the shank around a longitudinal axis of the shank, and wherein the shank includes connecting threads at a front end portion of the shank for connecting a drilling tool to the shank by a screw-mounting. 
     
     
         13 . The arrangement as claimed in  claim 1 , wherein the arrangement is located in a rock drilling rig including a movable carrier, at least one drilling boom and a feed beam in the at least one drilling boom. 
     
     
         14 . A method of mounting a rock drilling machine, the method comprising:
 assembling the rock drilling machine by connecting a gear module and a percussion module axially successively to each other by connecting elements;   mounting the pre-assembled rock drilling machine to a carriage by fastening lugs, whereby the rock drilling machine is supportable to a feed beam of a rock drilling unit by the carriage;   generating during the assembly of the rock drilling machine a first connecting force by several first connecting devices in order to press the gear module and the percussion module axially towards each other;   mounting the rock drilling machine to the fastening lugs of the carriage by several second connecting devices and simultaneously generating a second connecting force for pressing the gear module and the percussion module axially towards each other; and   keeping during the operation of the rock drilling machine axial joint between the gear module and the percussion module pressed against each other under influence of the first connecting forces and the second connecting forces.