Modular drilling reamer

Abstract

The present invention provides a modular drilling reamer which includes a central tube, a drill bit base and a centralizer which are detachably connected to two opposite ends of the central tube respectively. The drill bit base has a first connecting hole for detachably connecting with the central tube and assembling holes for mounting single drill bits, scrapers and/or centralizing rollers. The centralizer has a second connecting hole for detachably connecting with the central tube. The modular drilling reamer provided by the present invention can be modular with various replaceable drill bits by connecting the central tube with the centralizer and the drill bit base. It is convenient to assemble and is applicable to various reaming sizes and operations by replacing the drill bit bases which are different in size or the drill bit base equipped with different drill bits.

What is claimed is: 
     
         1 . A modular drilling reamer, comprising:
 a central tube;   a drill bit base and a centralizer which are detachably connected to two opposite ends of the central tube respectively;   wherein the drill bit base comprises a first connecting hole for detachably connecting with the central tube and assembling holes for mounting single drill bits, scrapers and/or centralizing rollers;   the centralizer comprising a second connecting hole for detachably connecting with the central tube.   
     
     
         2 . The modular drilling reamer according to  claim 1  further comprising a bushing sheathed on the center tube, wherein two opposite ends of the bushing are detachably and fixedly connected with the drill bit base and the centralizer respectively. 
     
     
         3 . The modular drilling reamer according to  claim 2 , wherein one end of the first connecting hole and one end of the second connecting hole respectively comprise a first radial receiving portion and a second radial receiving portion which form clearances with the central tube, and the two opposite ends of the bushing extend into the first radial receiving portion and the second radial receiving portion respectively. 
     
     
         4 . The modular drilling reamer according to  claim 3 , wherein the first radial receiving portion and/or the second radial receiving portion are/is fixedly connected with the bushing via threaded connection and/or welding. 
     
     
         5 . The modular drilling reamer according to  claim 1 , wherein the first connecting hole and/or the second connecting hole are/is detachably connected with the central tube via threaded connection. 
     
     
         6 . The modular drilling reamer according to  claim 2 , wherein the first connecting hole and/or the second connecting hole are/is detachably connected with the central tube via threaded connection. 
     
     
         7 . The modular drilling reamer according to  claim 3 , wherein the first connecting hole and/or the second connecting hole are/is detachably connected with the central tube via threaded connection. 
     
     
         8 . The modular drilling reamer according to  claim 4 , wherein the first connecting hole and/or the second connecting hole are/is detachably connected with the central tube via threaded connection. 
     
     
         9 . The modular drilling reamer according to  claim 1 , wherein the drill bit base comprises fixing plates which are located on outer surface of the first connecting hole and disposed along the longitudinal direction of the first connecting hole. 
     
     
         10 . The modular drilling reamer according to  claim 2 , wherein the drill bit base comprises fixing plates which are located on outer surface of the first connecting hole and disposed along the longitudinal direction of the first connecting hole. 
     
     
         11 . The modular drilling reamer according to  claim 3 , wherein the drill bit base comprises fixing plates which are located on outer surface of the first connecting hole and disposed along the longitudinal direction of the first connecting hole. 
     
     
         12 . The modular drilling reamer according to  claim 4 , wherein the drill bit base comprises fixing plates which are located on outer surface of the first connecting hole and disposed along the longitudinal direction of the first connecting hole. 
     
     
         13 . The modular drilling reamer according to  claim 9 , wherein quantity of the fixing plates equals to that of the single drill bits, the scrapers and/or the centralizing rollers mounted on the drill bit base. 
     
     
         14 . The modular drilling reamer according to  claim 10 , wherein quantity of the fixing plates equals to that of the single drill bits, the scrapers and/or the centralizing rollers mounted on the drill bit base. 
     
     
         15 . The modular drilling reamer according to  claim 11 , wherein quantity of the fixing plates equals to that of the single drill bits, the scrapers and/or the centralizing rollers mounted on the drill bit base. 
     
     
         16 . The modular drilling reamer according to  claim 12 , wherein quantity of the fixing plates equals to that of the single drill bits, the scrapers and/or the centralizing rollers mounted on the drill bit base. 
     
     
         17 . The modular drilling reamer according to  claim 9 , wherein the fixing plates are right-angle triangle support plates. 
     
     
         18 . The modular drilling reamer according to  claim 10 , wherein the fixing plates are right-angle triangle support plates. 
     
     
         19 . The modular drilling reamer according to  claim 11 , wherein the fixing plates are right-angle triangle support plates. 
     
     
         20 . The modular drilling reamer according to  claim 12 , wherein the fixing plates are right-angle triangle support plates. 
     
     
         21 . The modular drilling reamer according to  claim 9 , wherein the fixing plates comprises reinforcing ribs. 
     
     
         22 . The modular drilling reamer according to  claim 10 , wherein the fixing plates comprises reinforcing ribs. 
     
     
         23 . The modular drilling reamer according to  claim 11 , wherein the fixing plates comprises reinforcing ribs. 
     
     
         24 . The modular drilling reamer according to  claim 12 , wherein the fixing plates comprises reinforcing ribs. 
     
     
         25 . The modular drilling reamer according to  claim 1 , wherein the drill bit base is a flange. 
     
     
         26 . The modular drilling reamer according to  claim 2 , wherein the drill bit base is a flange. 
     
     
         27 . The modular drilling reamer according to  claim 3 , wherein the drill bit base is a flange. 
     
     
         28 . The modular drilling reamer according to  claim 4 , wherein the drill bit base is a flange. 
     
     
         29 . The modular drilling reamer according to  claim 2 , wherein a first sealing ring is installed between the bushing and the first connecting hole; and a second sealing ring is installed between the bushing and the second connecting hole. 
     
     
         30 . The modular drilling reamer according to  claim 3 , wherein a first sealing ring is installed between the bushing and the first connecting hole; and a second sealing ring is installed between the bushing and the second connecting hole. 
     
     
         31 . The modular drilling reamer according to  claim 4 , wherein a first sealing ring is installed between the bushing and the first connecting hole; and a second sealing ring is installed between the bushing and the second connecting hole. 
     
     
         32 . The modular drilling reamer according to  claim 29 , wherein the bushing comprises a first annular groove for installing the first sealing ring and a second annular groove for installing the second sealing ring. 
     
     
         33 . The modular drilling reamer according to  claim 30 , wherein the bushing comprises a first annular groove for installing the first sealing ring and a second annular groove for installing the second sealing ring. 
     
     
         34 . The modular drilling reamer according to  claim 31 , wherein the bushing comprises a first annular groove for installing the first sealing ring and a second annular groove for installing the second sealing ring. 
     
     
         35 . The modular drilling reamer according to  claim 2 , wherein outer surface of the bushing is connected with the drill bit base via welding and/or threaded connection, and the outer surface of the bushing is also connected with the centralizer via welding and/or threaded connection. 
     
     
         36 . The modular drilling reamer according to  claim 3 , wherein outer surface of the bushing is connected with the drill bit base via welding and/or threaded connection, and the outer surface of the bushing is also connected with the centralizer via welding and/or threaded connection. 
     
     
         37 . The modular drilling reamer according to  claim 4 , wherein outer surface of the bushing is connected with the drill bit base via welding and/or threaded connection, and the outer surface of the bushing is also connected with the centralizer via welding and/or threaded connection. 
     
     
         38 . The modular drilling reamer according to  claim 4 , wherein the welding is intermittent welding. 
     
     
         39 . The modular drilling reamer according to  claim 35 , wherein the welding is intermittent welding. 
     
     
         40 . The modular drilling reamer according to  claim 36 , wherein the welding is intermittent welding. 
     
     
         41 . The modular drilling reamer according to  claim 37 , wherein the welding is intermittent welding. 
     
     
         42 . The modular drilling reamer according to  claim 1 , wherein each the assembling hole comprises a fixing block inside, one side surface of the fixing block forming a pressure-bearing slope, width of the fixing block is gradually decreased from one end close to the centralizer to another end away from the centralizer. 
     
     
         43 . The modular drilling reamer according to  claim 2 , wherein each the assembling hole comprises a fixing block inside, one side surface of the fixing block forming a pressure-bearing slope, width of the fixing block is gradually decreased from one end close to the centralizer to another end away from the centralizer. 
     
     
         44 . The modular drilling reamer according to  claim 3 , wherein each the assembling hole comprises a fixing block inside, one side surface of the fixing block forming a pressure-bearing slope, width of the fixing block is gradually decreased from one end close to the centralizer to another end away from the centralizer. 
     
     
         45 . The modular drilling reamer according to  claim 4 , wherein each the assembling hole comprises a fixing block inside, one side surface of the fixing block forming a pressure-bearing slope, width of the fixing block is gradually decreased from one end close to the centralizer to another end away from the centralizer. 
     
     
         46 . The modular drilling reamer according to  claim 42 , wherein each of the fixing blocks is fixedly connected with the drill bit base through a fastening bolt. 
     
     
         47 . The modular drilling reamer according to  claim 43 , wherein each of the fixing blocks is fixedly connected with the drill bit base through a fastening bolt. 
     
     
         48 . The modular drilling reamer according to  claim 44 , wherein each of the fixing blocks is fixedly connected with the drill bit base through a fastening bolt. 
     
     
         49 . The modular drilling reamer according to  claim 45 , wherein each of the fixing blocks is fixedly connected with the drill bit base through a fastening bolt. 
     
     
         50 . The modular drilling reamer according to  claim 1 , wherein the central tube comprises a central cavity communicated with an external fluid source; and the drill bit base further comprises a nozzle assembling hole for assembling a nozzle, the nozzle being fixed inside the nozzle assembling hole, the nozzle comprising a check ring; wherein fluid in the central cavity and the nozzle is communicated through a hole and/or a pipeline penetrating through the central cavity and the nozzle. 
     
     
         51 . The modular drilling reamer according to  claim 2 , wherein the central tube comprises a central cavity communicated with an external fluid source; and the drill bit base further comprises a nozzle assembling hole for assembling a nozzle, the nozzle being fixed inside the nozzle assembling hole, the nozzle comprising a check ring; wherein fluid in the central cavity and the nozzle is communicated through a hole and/or a pipeline penetrating through the central cavity and the nozzle. 
     
     
         52 . The modular drilling reamer according to  claim 3 , wherein the central tube comprises a central cavity communicated with an external fluid source; and the drill bit base further comprises a nozzle assembling hole for assembling a nozzle, the nozzle being fixed inside the nozzle assembling hole, the nozzle comprising a check ring; wherein fluid in the central cavity and the nozzle is communicated through a hole and/or a pipeline penetrating through the central cavity and the nozzle. 
     
     
         53 . The modular drilling reamer according to  claim 4 , wherein the central tube comprises a central cavity communicated with an external fluid source; and the drill bit base further comprises a nozzle assembling hole for assembling a nozzle, the nozzle being fixed inside the nozzle assembling hole, the nozzle comprising a check ring; wherein fluid in the central cavity and the nozzle is communicated through a hole and/or a pipeline penetrating through the central cavity and the nozzle.