Retention system for retaining deck bushing of drilling machine

Abstract

A retention system for retaining a deck bushing of a drilling machine includes a hydraulically operated breakout (HOBO) device that is movable between a retracted position and an extended position. The retention system also includes a retention arm assembly coupled with the HOBO device proximal to a top surface of the HOBO device. When the HOBO device is in the extended position, the retention arm assembly is engaged with the deck bushing to retain the deck bushing in a raised state. When the HOBO device is in the retracted position, the retention arm assembly is disengaged from the deck bushing. The retention system further includes a retention element. When the HOBO device is in the retracted position and the retention arm assembly is disengaged from the deck bushing, the retention element is in engagement with the deck bushing to retain the deck bushing on the drill string.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a drilling machine, and more particularly, to a retention system for retaining a deck bushing of the drilling machine and a method of retaining the deck bushing of the drilling machine.BACKGROUND

[0002] A drilling machine includes a drill string having a work tool for performing drilling operations at a worksite. The drill string includes one or more connected drill pipes, cross-over adaptors, and the work tool which is connected to a bottom of a formation. The work tool may include a rotary drill bit or a down-the-hole drill bit. The drill pipe is connected to a rotary head of the drilling machine for performing a drilling operation. Further, a drill pipe adaptor many a times connects the work tool with the drill pipe.

[0003] The drilling machine includes a deck bushing that provides horizontal stabilization to the drill string as the drill string passes through a deck of the drilling machine. The deck bushing is disposed around the drill string and guides the drill string during drilling. When the work tool is to be inspected and / or replaced, a manual procedure is employed to prevent the deck bushing from slipping out of the drill string. Further, the deck bushing is to be retained a few inches above the work tool during a replacement process of the work tool. Conventionally, operators many a times have to manually lift the heavy deck bushing.

[0004] The manual procedure of holding the deck bushing in contact with the drill string includes halting of the drilling operation and manually inserting a horseshoe plate to secure the deck bushing on the drill string. Subsequently, an operator returns to an operator station of the drilling machine to continue the replacement process of the work tool. Further, after the work tool is replaced, the operator has to manually disengage the horseshoe tool from the deck bushing. Such a manual procedure of retaining the deck bushing is time-consuming as it involves multiple process steps, live work, involves considerable operator involvement, and may cause operator fatigue.

[0005] U.S. Pat. No. 11,142,970 describes a bit changer assembly that includes a bit basket actuator assembly configured to be coupled to a drill rig. The bit basket actuator assembly includes an actuator, a guiderail, and a bit basket that is movably coupled to the guiderail via actuation of the actuator. The bit changer assembly also includes a bit carousel configured to be coupled to the drill rig, such that the bit carousel is rotatably and vertically moveable relative to the drill rig.SUMMARY OF THE DISCLOSURE

[0006] In an aspect of the present disclosure, a retention system for retaining a deck bushing of a drilling machine is provided. The deck bushing is movable relative to a drill string of the drilling machine. The retention system includes a hydraulically operated breakout (HOBO) device to facilitate an inspection and / or a replacement of a work tool from the drill string of the drilling machine. The HOBO device is movable between a retracted position and an extended position. The HOBO defines a top surface. The retention system also includes a retention arm assembly coupled with the HOBO device proximal to the top surface of the HOBO device. When the HOBO device is in the extended position, the retention arm assembly is engaged with the deck bushing to retain the deck bushing in a raised state to facilitate the inspection and / or the replacement of the work tool from the drill string of the drilling machine. When the HOBO device is in the retracted position, the retention arm assembly is disengaged from the deck bushing. The retention system further includes a retention element coupled proximal to a bottom end of the drill string. When the HOBO device is in the retracted position and the retention arm assembly is disengaged from the deck bushing after the inspection and / or replacement of the work tool from the drill string, the retention element is in engagement with the deck bushing to retain the deck bushing on the drill string.

[0007] In another aspect of the present disclosure, a drilling machine is provided. The drilling machine includes a frame. The drilling machine also includes a mast system supported by the frame. The drilling machine further includes a drill string. The drilling machine includes a work tool coupled to the drill string. The drilling machine also includes a deck bushing movable relative to the drill string between a raised state and a lowered state. The drilling machine further includes a retention system for retaining the deck bushing in the raised state to facilitate an inspection and / or a replacement of the work tool from the drill string. The retention system includes a hydraulically operated breakout (HOBO) device to facilitate the inspection and / or the replacement of the work tool from the drill string. The HOBO device is movable between a retracted position and an extended position. The HOBO defines a top surface. The retention system also includes a retention arm assembly coupled with the HOBO device proximal to the top surface of the HOBO device. When the HOBO device is in the extended position, the retention arm assembly is engaged with the deck bushing to retain the deck bushing in the raised state to facilitate the inspection and / or the replacement of the work tool from the drill string of the drilling machine. When the HOBO device is in the retracted position, the retention arm assembly is disengaged from the deck bushing. The retention system further includes a retention element coupled proximal to a bottom end of the drill string. When the HOBO device is in the retracted position and the retention arm assembly is disengaged from the deck bushing after the inspection and / or replacement of the work tool from the drill string, the retention element is in engagement with the deck bushing to retain the deck bushing on the drill string.

[0008] In yet another aspect of the present disclosure, a method for retaining a deck bushing of a drilling machine is provided. The method includes engaging a pipe positioner system with a drill string of the drilling machine to guide and center a movement of the drill string along a vertical axis. The method also includes raising the drill string such that a work tool of the drilling machine is raised above a mast base plate of the drilling machine. The method further includes moving a hydraulically operated breakout (HOBO) device from a retracted position to an extended position towards the drill string to facilitate an inspection and / or a replacement of the work tool from the drill string of the drilling machine. The method includes engaging a retention arm assembly of the drilling machine with the deck bushing based on the movement of the HOBO device from the retracted position to the extended position. The retention arm assembly is coupled with the HOBO device proximal to a top surface of the HOBO device. The method also includes retaining, by the retention arm assembly, the deck bushing in a raised state based on an engagement of the retention arm assembly with the deck bushing to facilitate the inspection and / or the replacement of the work tool from the drill string of the drilling machine. The method further includes engaging a retention element of the drilling machine with the deck bushing after the inspection and / or the replacement of the work tool from the drill string of the drilling machine. The retention element is coupled to the drill string proximal to a bottom end of the drill string. The method includes retaining, by the retention element, the deck bushing on the drill string based on an engagement of the retention element with the deck bushing. The method also includes moving the HOBO device from the extended position to the retracted position. The method further includes reseating the deck bushing on a mast base plate. The method further includes lowering the drill string of the drilling machine to a Ready-To-Drill state or a Ready-To-Tram state.

[0009] Other features and aspects of this disclosure will be apparent from the following description and the accompanying drawings.BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG. 1 is a schematic side view of an exemplary drilling machine;

[0011] FIG. 2A is a perspective view of a drill string of the drilling machine of FIG. 1;

[0012] FIG. 2B is a perspective view of a lower sub adaptor of the drill string of FIG. 2A;

[0013] FIG. 2C is a schematic cross-sectional view of a deck bushing of the drilling machine in contact with the drill string of FIG. 2A;

[0014] FIG. 3A is a schematic top view of a portion of the drilling machine of FIG. 1 illustrating a retention system for retaining a deck bushing of the drilling machine, according to an embodiment of the present disclosure;

[0015] FIG. 3B is a top sectional view of a portion of the drilling machine illustrating a pipe positioner system of the retention system of FIG. 3A;

[0016] FIG. 4 is a top view illustrating a retention arm assembly of the retention system of FIG. 3A engaged with the deck bushing of the drilling machine;

[0017] FIG. 5 is a sectional side view illustrating the retention arm assembly of the retention system of FIG. 3A engaged with the deck bushing of the drilling machine;

[0018] FIG. 6 is a schematic side view illustrating a retention element of the retention system of FIG. 3A engaged with the deck bushing of the drilling machine, according to an embodiment of the present disclosure;

[0019] FIG. 7 is a schematic view illustrating a retention element of the retention system of FIG. 3A, according to another embodiment of the present disclosure;

[0020] FIG. 8 is a schematic view illustrating a retention element of the retention system of FIG. 3A, according to yet another embodiment of the present disclosure;

[0021] FIG. 9 is a schematic view illustrating a retention element of the retention system of FIG. 3A, according to an embodiment of the present disclosure; and

[0022] FIG. 10 is a flowchart of a method for retaining the deck bushing of the drilling machine of FIG. 1, according to an embodiment of the present disclosure.DETAILED DESCRIPTION

[0023] Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0024] Referring to FIG. 1, a schematic side view of an exemplary drilling machine 100 is illustrated. In the illustrated embodiment of FIG. 1, the drilling machine 100 is a rotary drilling machine. However, the drilling machine 100 may embody any other type of drilling machine, without any limitations. The drilling machine 100 may be a manual, an autonomous, or a semi-autonomous work machine. The drilling machine 100 may be used to perform one or more drilling operations, such as drilling holes, mining blast holes, geothermal wells, and the like. The drilling machine 100 defines a vertical axis A1.

[0025] As shown in FIG. 1, the drilling machine 100 includes a frame 102. The frame 102 may be supported on a ground surface by a transport mechanism, such as crawler tracks 104. The crawler tracks 104 may allow the drilling machine 100 to maneuver on ground surfaces to a desired location for performing drilling operations. Alternatively, the drilling machine 100 may include wheels instead of the crawler tracks 104. The frame 102 includes one or more jacks (not shown herein) for supporting and leveling the drilling machine 100 on the ground surface during drilling operations.

[0026] The drilling machine 100 also includes a machinery 106. The frame 102 may support the machinery 106, which may include various components (not shown), such as, a power source (for example, an engine, a battery system, and / or a fuel system), motors, pumps, air compressors, and / or any other equipment necessary to supply power to operate the drilling machine 100. The frame 102 further supports an operator cabin 108, from which an operator may maneuver and control the drilling machine 100.

[0027] The drilling machine 100 includes a mast system 110 supported on the frame 102. The mast system 110 extends along the vertical axis A1. The mast system 110 includes a mast weldment 112 coupled to the frame 102.

[0028] The drilling machine 100 further includes a drill head 114 movable relative to the mast system 110. The drill head 114 is movable along the vertical axis A1 and is supported on the mast system 110. The machinery 106 may provide power to operate the drill head 114 relative to the mast system 110. In some examples, the drilling machine 100 may include one or more motors (not shown) associated with the drill head 114.

[0029] Referring now to FIG. 2A, the drilling machine 100 includes a drill string 118. Only a portion of the drill string 118 is illustrated in FIG. 2A. The drill head 114 (see FIG. 1) may support the drill string 118. The drill head 114 may couple to, and rotate, the drill string 118 for performing the drilling operation. The drill string 118 defines a bottom end 134. The drilling machine 100 further includes a work tool 120 coupled to the drill string 118. Specifically, the work tool 120 is coupled to the drill string 118, proximal to the bottom end 134 of the drill string 118. The work tool 120 may allow drilling into various surfaces. The work tool 120 may include a drill bit. For example, the work tool 120 may include a rotary drill bit or a down-the-hole (DTH) drill bit. In the illustrated embodiment of FIG. 2A, the work tool 120 is embodied as the rotary drill bit. Alternatively, the work tool 120 may embody any other work tool that can be used to perform drilling operations.

[0030] The drill string 118 includes a drill pipe 119 (shown in FIG. 9), an upper sub adaptor (not shown), and a lower sub adaptor 122. The lower sub adaptor 122 couples the work tool 120 with the drill string 118. In other words, the lower sub adaptor 122 is disposed between the drill pipe 119 and the work tool 120 and allows coupling of the work tool 120 with the drill string 118.

[0031] Referring now to FIGS. 2A and 2B, the lower sub adaptor 122 includes a first end 136 and a second end 138. The lower sub adaptor 122 is coupled with the drill pipe 119 (see FIG. 9) proximal to the first end 136. Further, the lower sub adaptor 122 is coupled with the work tool 120 proximal to the second end 138.

[0032] Referring to FIGS. 2A and 2C, the drilling machine 100 includes a deck bushing 124 movable relative to the drill string 118. The deck bushing 124 is mounted on a mast base plate 125 (shown in FIG. 3A). The deck bushing 124 guides and supports the drill string 118 during the drilling operation. In an example, when the drilling machine 100 trams from hole to hole, the deck bushing 124 fits into the mast base plate 125. Further, the work tool 120, that is mounted to the second end 138 of the lower sub adaptor 122, lies below the mast base plate 125 to perform the drilling operation. The deck bushing 124 is movable relative to the drill string 118 of the drilling machine 100 between a raised state and a lowered state. In the lowered state of the deck bushing 124, the deck bushing 124 may fit flat on to the mast base plate 125. The deck bushing 124 is moved to the raised state during an inspection and / or a replacement of the work tool 120 from the drill string 118 of the drilling machine 100. Specifically, the drill string 118 is raised to a pre-defined height during the inspection and / or the replacement of the work tool 120 from the drill string 118. The deck bushing 124 defines an upper end 126 and a lower end 128 opposite the upper end 126. The deck bushing 124 includes a flange 130 at the upper end 126, and a bottom surface 132 defined at the lower end 128. Further, the deck bushing 124 defines an inner diameter D1.

[0033] The deck bushing 124 is embodied as a plain sleeve type deck bushing in FIG. 2C. However, the deck bushing 124 may embody a ball bearing sleeve type deck bushing. The deck bushing 124 includes an inner sleeve 127 and an outer sleeve 129. The inner sleeve 127 rotates with respect to the outer sleeve 129. The outer sleeve 129 may remain static on the drill string 118 during the drilling operation.

[0034] With reference to FIG. 3A, the drilling machine 100 further includes a retention system 200 for retaining the deck bushing 124 in the raised state to facilitate the inspection and / or the replacement of the work tool 120 (see FIG. 2A) from the drill string 118 (see FIG. 2A) of the drilling machine 100. The retention system 200 includes a hydraulically operated breakout (HOBO) device 140 to facilitate the inspection and / or the replacement of the work tool 120 from the drill string 118 of the drilling machine 100. The HOBO device 140 is movable between a retracted position R1 and an extended position R2 (shown in FIGS. 4 and 5). The HOBO device 140 is shown in the retracted position R1 in FIG. 3A and in the extended position R2 in FIGS. 4 and 5.

[0035] As shown in FIG. 3A, the HOBO device 140 defines a top surface 144. The drilling machine 100 includes a first actuator 146. When the first actuator 146 is actuated, the first actuator 146 moves the HOBO device 140 from the retracted position R1 to the extended position R2. The first actuator 146 is a hydraulic actuator herein.

[0036] The HOBO device 140 includes a conventional HOBO wrench including components and mechanisms known to persons skilled in the art. The HOBO device 140 is a wrench that may be used to grip the drill string 118, and occasionally the work tool 120, to assist in a removal / attachment of the work tool 120 with the drill string 118. Specifically, the HOBO device 140 may grip the lower sub adaptor 122 of the drill string 118. The HOBO device 140 includes a number of gripping surfaces 150 (only one of which is shown in FIG. 3A) that may engage with the drill string 118 when the HOBO device 140 is in the extended position R2. Specifically, the HOBO device 140 includes a pair of jaws 148. The jaws 148 define the gripping surfaces 150 that engage with the drill string 118. The gripping surfaces 150 may be flat surfaces that engage with flat surfaces (not shown) on the drill string 118.

[0037] The drilling machine 100 further includes a second actuator (not shown). The second actuator moves the jaws 148 of the HOBO device 140 between an engaged state and a disengaged state. When the second actuator extends, the second actuator causes the jaws 148 to engage with the drill string 118. Thus, in the engaged state, the jaws 148 engage with the drill string 118. Further, when the second actuator retracts, the second actuator disengages the jaws 148 from the drill string 118. Thus, in the disengaged state, the jaws 148 are disengaged from the drill string 118. The second actuator may be a hydraulic actuator.

[0038] Referring now to FIG. 3B, the retention system 200 further includes a pipe positioner system 250. The pipe positioner system 250 is coupled to the mast weldment 112. The pipe positioner system 250 contacts the drill string 118 to guide and center a movement of the drill string 118 along the vertical axis A1. Specifically, the pipe positioner system 250 contacts the drill pipe 119 (see FIG. 9). It should be noted that the vertical axis A1 is defined as an axis that passes through a drill center hole (not shown) on the mast base plate 125 (see FIG. 3A). In other words, the pipe positioner system 250 centers and guides the drill string 118 to drill a hole (not shown) that is perpendicular to the mast base plate 125 and is straight in geometry.

[0039] The pipe positioner system 250 includes one or more support arms 252, 254 that contacts with the drill string 118 to facilitate the movement of the drill string 118 along the vertical axis A1. Specifically, the one or more support arms 252, 254 includes a first support arm 252 and a second support arm 254. Each of the first support arm 252 and the second support arm 254 are distant to each other and are disposed at an angle from each other. In some examples, each of the first support arm 252 and the second support arm 254 may be disposed opposite to each other. The first support arm 252 includes a first arm 261 and a first roller 260. The first roller 260 is coupled to the first arm 261 via one or more fastening means 264. The second support arm 254 includes a second arm 263 and a second roller 262. The second roller 262 is coupled to the second arm 263 via one or more fastening means 266. In some examples, the one or more fastening means 264, 266 may include a bolt, a screw, a rivet, and the like. One end of each of the first arm 261 and the second arm 263 is coupled with the mast system 110, whereas another end of each of the first arm 261 and the second arm 263 engages with the drill string 118.

[0040] The pipe positioner system 250 further includes a first actuator 256 associated with the first support arm 252 and a second actuator 258 associated with the second support arm 254. The first actuator 256 is coupled to the first arm 261 at one end and to the mast system 110 at another end. The second actuator 258 is coupled to the second arm 263 at one end and to the mast system 110 at another end.

[0041] Based on an extension of the first actuator 256, the first support arm 252 contacts with the drill string 118. In other words, based on the extension of the first actuator 256, the first support arm 252 moves angularly such that the first roller 260 contacts with the drill string 118. Further, based on an extension of the second actuator 258, the second support arm 254 contacts with the drill string 118. In other words, based on the extension of the second actuator 258, the second support arm 254 moves angularly such that the second roller 262 contacts with the drill string 118. It should be noted that, the pipe positioner system 250 may include one or more arms with guiding elements of various geometries other than rollers 260, 262 without any limitations.

[0042] Referring now to FIGS. 3A, 4, and 5, the retention system 200 also includes a retention arm assembly 202 coupled with the HOBO device 140 proximal to the top surface 144 of the HOBO device 140. When the HOBO device 140 is in the extended position R2, the retention arm assembly 202 is engaged with the deck bushing 124 to retain the deck bushing 124 in the raised state to facilitate the inspection and / or the replacement of the work tool 120 (see FIG. 2A) from the drill string 118 (see FIG. 2A) of the drilling machine 100. The retention arm assembly 202 is shown as engaged with the deck bushing 124 in FIGS. 4 and 5. Further, in a case wherein the replacement of the work tool 120 (i.e., the rotary drill bit) is required, the HOBO device 140 breaks a joint between the work tool 120 and the lower sub adaptor 122, while the retention arm assembly 202 retains the deck bushing 124 in the raised state.

[0043] Furthermore, the pipe positioner system 250 (see FIG. 3B) contacts the drill string 118 to guide and center the movement of the drill string 118 along the vertical axis A1 (see FIG. 3B) before the retention arm assembly 202 engages with the deck bushing 124. In other words, the pipe positioner system 250 guides the movement of the drill string 118 along the vertical axis A1 and minimizes the shifting of the drill pipe 119 (see FIG. 9) and / or the drill string 118 away from a drill central axis before the retention arm assembly 202 engages with the deck bushing 124.

[0044] When the HOBO device 140 is in the retracted position R1, the retention arm assembly 202 is disengaged from the deck bushing 124. The retention arm assembly 202 is shown as disengaged from the deck bushing 124 in FIG. 3A.

[0045] The retention arm assembly 202 includes a coupling member 204 that couples the retention arm assembly 202 with the top surface 144 of the HOBO device 140. The coupling member 204 extends orthogonally, along the vertical axis A1 (see FIG. 1), relative to the top surface 144 of the HOBO device 140. The retention arm assembly 202 also includes one or more arms 206 integral with the coupling member 204. The one or more arms 206 are spaced apart from the top surface 144 of the HOBO device 140 by the coupling member 204. In the illustrated example of FIG. 3A, the one or more arms 206 includes a pair of arms 206. The pair of arms 206 are hereinafter interchangeably referred to as the “one or more arms 206”.

[0046] The pair of arms 206 define a U-shape herein. Alternatively, the pair of arms 206 may have any other shape that may allow retention of the deck bushing 124. Further, the pair of arms 206 are spaced apart from each other such that a slot 208 is defined therebetween. When the HOBO device 140 is in the extended position R2, the pair of arms 206 engage with the deck bushing 124 to retain the deck bushing 124 in the raised state for the inspection and / or the replacement of the work tool 120 from the drill string 118 of the drilling machine 100. Further, when the HOBO device 140 is in the extended position R2, the pair of arms 206 engage with the flange 130 of the deck bushing 124 or the bottom surface 132 of the deck bushing 124. Further, when the pair of arms 206 engage with the flange 130 of the deck bushing 124, the slot 208 defined by the pair of arms 206 receives the deck bushing 124 therein. Alternatively, the pair of arms 206 may engage with the bottom surface 132 of the deck bushing 124. When the pair of arms 206 engage with the bottom surface 132 of the deck bushing 124, the slot 208 defined by the pair of arms 206 receive a portion of the lower sub adaptor 122 therein.

[0047] The retention system 200 further includes one or more fastening members 210 (only one of which is illustrated in FIG. 5) that removably couple the coupling member 204 of the retention arm assembly 202 with the top surface 144 of the HOBO device 140. The fastening members 210 may include bolts, pins, screws, and the like. The retention system 200 may additionally include brackets or couplers that may assist in coupling of the coupling member 204 with the top surface 144. It may be contemplated that the retention arm assembly 202 may be coupled with the top surface 144 of the HOBO device 140 using any other technique known to persons skilled in the art. For example, the retention arm assembly 202 may be coupled with the top surface 144 of the HOBO device 140 by welding, soldering, brazing, and the like.

[0048] Referring to FIG. 6, the retention system 200 further includes a retention element 212 coupled proximal to the bottom end 134 of the drill string 118. Specifically, the retention element 212 is disposed at the second end 138 of the lower sub adaptor 122. The retention element 212 may be integral with the drill string 118 or fixedly coupled with the drill string 118. In an example, the retention element 212 may be fixedly coupled with the lower sub adaptor 122 by welding, soldering, brazing, and the like. In other examples, the retention element 212 may be removably coupled with the drill string 118 for example, via one or more fastening elements.

[0049] The retention element 212 defines a maximum diameter D2 that is greater than the inner diameter D1 (see FIG. 2C) of the deck bushing 124. In some examples, the maximum diameter D2 may be greater than the inner diameter D1 but less than an outer diameter defined at the bottom surface 132 of the deck bushing 124. Further, a diameter D6 of the work tool 120 is greater than the maximum diameter D2.

[0050] When the HOBO device 140 is in the retracted position R1 (see FIG. 3A) and the retention arm assembly 202 (see FIG. 3A) is disengaged from the deck bushing 124 after the inspection and / or replacement of the work tool 120 from the drill string 118, the retention element 212 is in engagement with the deck bushing 124 to retain the deck bushing 124 on the drill string 118. The retention element 212 retains the deck bushing 124 in the lowered state after the inspection and / or the replacement of the work tool 120 from the drill string 118. In other words, after the inspection and / or the replacement of the work tool 120 from the drill string 118, the drill string 118 (along with the retention element 212) is raised. Further, the retention element 212 engages with the deck bushing 124 to retain the deck bushing 124 on the drill string 118, soon after the HOBO device 140 moves to the retracted position R1 from the extended position R2 and the retention arm assembly 202 is disengaged from the deck bushing 124.

[0051] Further, a location of the retention element 212 is based on a type of the work tool 120 associated with the drilling machine 100. Specifically, in the illustrated embodiment of FIG. 6, the work tool 120 is the rotary drill bit, and the retention element 212 is disposed at the second end 138 of the lower sub adaptor 122. The retention element 212 has a stepped profile herein. The retention element 212 includes a first portion 216 and a second portion 218. The first portion 216 has an outer diameter D3 that is lesser than the inner diameter D1 of the deck bushing 124. When the deck bushing 124 engages with the retention element 212, the first portion 216 is received within the deck bushing 124. Further, the second portion 218 defines the maximum diameter D2 that is greater than the outer diameter D3 of the first portion 216 and the inner diameter D1 of the deck bushing 124, such that the bottom surface 132 rests on the second portion 218 to engage the deck bushing 124 with the retention element 212.

[0052] As shown in FIG. 6, the retention element 212 defines a number of passages 214 to purge out air and / or debris. Specifically, the number of passages 214 may purge out air and / or debris, during the drilling operation. Specifically, the debris may be drilling debris generated during the drilling operation. The passages 214 extend along the vertical axis A1 (see FIG. 1). The retention element 212 may define any number of passages 214, such as three, four, five, six, and so on, as per application attributes.

[0053] FIG. 7 is a side view illustrating a retention element 712 of the retention system 200 of FIG. 3A, according to another embodiment of the present disclosure. In the embodiment illustrated in FIG. 7, a work tool 121 associated with the drilling machine 100 (see FIG. 1) is the DTH drill bit.

[0054] The drill string 118 also includes a hammer 123. The hammer 123 is disposed between the lower sub adaptor 122 (see FIG. 6) and the work tool 121. Further, in the illustrated embodiment of FIG. 7, the retention element 712 is disposed on the hammer 123 instead of the lower sub adaptor 122. The retention element 712 is disposed proximal to an end of the hammer 123 to which the work tool 121 is coupled. The hammer 123 includes a chuck 718. The retention element 712 is disposed proximal to the chuck 718. In other examples, the retention element 712 may be disposed midway along the hammer 123, or at any other location on the hammer 123, without any limitations. The retention element 712 may be integral with the drill string 118 or fixedly coupled with the drill string 118. In an example, the retention element 712 may be fixedly coupled with the hammer 123 by welding, soldering, brazing, and the like. In other examples, the retention element 712 may be removably coupled with the drill string 118 for example, via one or more fastening elements.

[0055] The retention element 712 is designed as a collar herein. The retention element 712 includes a number of engaging portions 716. The retention element 712 may include any number of engaging portions 716, such as three, four, five, six, and so on, based on application attributes. The retention element 712 defines a maximum diameter D5 that is greater than the inner diameter D1 (see FIG. 2C) of the deck bushing 124 (see FIG. 6), such that the bottom surface 132 (see FIG. 6) of the deck bushing 124 can rest on the engaging portions 716 to engage the deck bushing 124 with the retention element 712. Specifically, the number of engaging portions 716 together define the maximum diameter D5. Further, a diameter D7 of the work tool 121 is greater than the maximum diameter D5.

[0056] The retention element 712 defines a number of passages 714 to purge out air and / or debris there through. Specifically, the number of passages 714 may purge out air and / or debris during the drilling operation. The passages 714 extend along the vertical axis A1 (see FIG. 1). Each passage 714 is defined between adjacent engaging portions 716. The retention element 712 may define any number of passages 714, such as three, four, five, six, and so on, based on the number of engaging portions 716.

[0057] FIG. 8 is a perspective view illustrating a retention element 812 of the retention system 200 of FIG. 3A, according to yet another embodiment of the present disclosure. In the illustrated embodiment of FIG. 8, the retention element 812 includes a number of projections 816. The retention element 812 is disposed proximal to the second end 138 of the lower sub adaptor 122. In other examples, the retention element 812 may be disposed midway along the lower sub adaptor 122, or at any other location on the lower sub adaptor 122, without any limitations. The retention element 812 may be integral with the drill string 118 or fixedly coupled with the drill string 118. In an example, the retention element 812 may be fixedly coupled with the lower sub adaptor 122 by welding, soldering, brazing, and the like. In other examples, the retention element 812 may be removably coupled with the drill string 118 for example, via one or more fastening elements.

[0058] The retention element 812 may include any number of projections 816, such as three, four, five, six, and so on, based on application attributes. The retention element 812 defines a maximum diameter D8 that is greater than the inner diameter D1 (see FIG. 2C) of the deck bushing 124 (see FIG. 6), such that the bottom surface 132 (see FIG. 6) of the deck bushing 124 rests on the projections 816 to engage the deck bushing 124 with the retention element 812. Specifically, the number of projections 816 together define the maximum diameter D8. The retention element 812 can be used with the rotary drill bit or the DTH drill bit. Further, the diameter D6, D7 of the work tool 120, 121 (see FIGS. 6 and 7) is greater than the maximum diameter D8.

[0059] The retention element 812 defines a number of passages 814 to purge out air and / or debris therethrough. Specifically, the number of passages 814 may purge out air and / or debris during the drilling operation. Each passage 814 is defined between adjacent projections 816. The retention element 812 may define any number of passages 814, such as three, four, five, six, and so on, based on the number of projections 816.

[0060] FIG. 9 is a schematic view illustrating a retention element 912 of the retention system 200 of FIG. 3A, according to an embodiment of the present disclosure. In the illustrated embodiment of FIG. 9, the work tool 121 is the DTH drill bit. The drill string 118 also includes the hammer 123. The hammer 123 is disposed between the lower sub adaptor 122 and the work tool 121. Further, in the illustrated embodiment of FIG. 9, the retention element 912 is disposed on the lower sub adaptor 122. The retention element 912 is disposed on the lower sub adaptor 122 for retention of the deck bushing 124 (see FIG. 3A) on the drill string 118 when the hammer 123 is to be replaced. Specifically, the retention element 912 is disposed proximal to the second end 138 of the lower sub adaptor 122. In other examples, the retention element 912 may be disposed midway along lower sub adaptor 122, or at any other location on the lower sub adaptor 122, without any limitations. The retention element 912 may be integral with the drill string 118 or fixedly coupled with the drill string 118. In an example, the retention element 912 may be fixedly coupled with the lower sub adaptor 122 by welding, soldering, brazing, and the like. In other examples, the retention element 912 may be removably coupled with the drill string 118 for example, via one or more fastening elements.

[0061] The retention element 912 is designed as a collar herein. The retention element 912 includes a number of engaging portions 916. The retention element 912 may include any number of engaging portions 916, such as three, four, five, six, and so on, based on application attributes. The engaging portions 916 defines a maximum diameter D9 that is greater than the inner diameter D1 (see FIG. 2C) of the deck bushing 124, so that the bottom surface 132 (see FIG. 6) of the deck bushing 124 can rest on the engaging portions 916 to engage the deck bushing 124 with the retention element 912. Specifically, the number of engaging portions 916 together define the maximum diameter D9. The retention element 912 can be used with rotary drill bits or DTH drill bits. Further, the diameter D7 of the work tool 121 is greater than the maximum diameter D9 of the retention element 912.

[0062] The retention element 912 defines a number of passages 914 to purge out air and / or debris therethrough. Specifically, the number of passages 914 may purge out air and / or debris during the drilling operation. The passages 914 extend along the vertical axis A1 (see FIG. 1). Each passage 914 is defined between adjacent engaging portions 916. The retention element 912 may include any number of passages 914, such as three, four, five, six, and so on, based on the number of engaging portions 916.

[0063] Referring to FIGS. 6 to 9, the retention element 212, 712, 812, 912 may be used to break a joint between the work tools 120, 121 or the hammer 123 and the lower sub adaptor 122 in an above-the-deck process, while a replacement of the work tools 120, 121 or the hammer 123 may be performed using a below-the-deck process.

[0064] Referring to FIGS. 2A to 6, in one exemplary application, the pipe positioner system 250 engages with the drill string 118. Further, when the work tool 120 is to be inspected and / or replaced, the drill string 118, along with the deck bushing 124, is raised to a desired height. Specifically, the drill string 118 is raised to the desired height such that the work tool 120 is raised above the mast base plate 125 to enable a bit basket 142 (shown in FIGS. 6 and 7) of the drilling machine 100 to slide below the work tool 120 in case of inspection and / or replacement of the work tool 120. In some examples, the bit basket 142 may be a hydraulically operated bit basket. It should be noted that, in such cases the deck bushing 124 rides on the work tool 120 and is in alignment with the retention arm assembly 202 for engagement. In other words, when the drill string 118 is being raised, the deck bushing 124 is in the lowered state and is engaged with the retention element 212. Further, the first actuator 146 of the HOBO device 140 is actuated to move the HOBO device 140 to the extended position R2. Based on the movement of the HOBO device 140 to the extended position R2, the retention arm assembly 202 is engaged with the deck bushing 124. The drill string 118 is moved downwards so that the work tool 120 engages with the bit basket 142. At this time, the retention arm assembly 202 is still engaged with the deck bushing 124 to retain the deck bushing 124 in the raised state for the inspection and / or the replacement of the work tool 120 from the drill string 118 of the drilling machine 100. Subsequently, the jaws 148 of the HOBO device 140 are moved to the engaged state to break a joint between the work tool 120 and the lower sub adaptor 122, while the work tool 120 will be retained in the bit basket 142 and will be replaced with a new work tool.

[0065] Even after the joint between the work tool 120 and the lower sub adaptor 122 is broken, the retention arm assembly 202 remains engaged till the work tool 120 is removed and replaced with the new work tool. After the joint between the work tool 120 and the lower sub adaptor 122 is broken, the jaws 148 are moved to the disengaged state. After the work tool 120 replacement on the drill string 118, the drill string 118 is raised up till the deck bushing 124 rides on the work tool 120 once again. Then the HOBO device 140 is moved to the retracted position R1, which causes the retention arm assembly 202 to disengage from the deck bushing 124. Disengagement of the retention arm assembly 202 from the deck bushing 124 causes the deck bushing 124 to move to the lowered position, thereby engaging the deck bushing 124 with the retention element 212. The work tool 120 is then removed from the bit basket 142 and replaced with a new work tool. Subsequently, the new work tool is coupled with the drill string 118. Further, it should be noted that, after the inspection and / or the replacement of the work tool 120, the deck bushing 124 is reseated on the mast base plate 125 of the drilling machine 100. Furthermore, the drill string 118 is also lowered to a Ready-To-Drill state or a Ready-To-Tram state.

[0066] It should be noted that the process of breaking the joint between the work tool 120 and the lower sub adaptor 122 as explained above is merely an example, and any other technique or components may be used to perform the intended function.

[0067] It is to be understood that individual features shown or described for one embodiment may be combined with individual features shown or described for another embodiment. The above-described implementation does not in any way limit the scope of the present disclosure. Therefore, it is to be understood although some features are shown or described to illustrate the use of the present disclosure in the context of functional segments, such features may be omitted from the scope of the present disclosure without departing from the spirit of the present disclosure as defined in the appended claims.INDUSTRIAL APPLICABILITY

[0068] The present disclosure relates to the retention system 200 for the drilling machine 100. The present disclosure relates to automatic retention of the deck bushing 124 using the retention system 200 for enabling removal / replacement of the work tool 120, 121 and / or the hammer 123. The retention system 200 may be used with both manual and autonomous drilling machines. The retention system 200 may be used during above-the-deck removal / breaking of work tools 120, 121 or the hammer 123.

[0069] The retention system 200 includes the retention arm assembly 202 coupled with the top surface 144 of the HOBO device 140. The retention arm assembly 202 automatically holds and secures the deck bushing 124 on the drill string 118, thereby preventing the deck bushing 124 from slipping during the removal / replacement of work tools or hammers. The retention system 200 makes use of the HOBO device 140 that already exists on the drilling machine 100 to assist in retention of the deck bushing 124. Thus, the HOBO device 140 performs the dual purpose of breaking the joint between the work tool 120, 121 / hammer 123 and the lower sub adaptor 122 as well as assists in retention of the deck bushing 124.

[0070] The retention arm assembly 202 and the retention element 212, 712, 812, 912 have a simple design and are therefore cost-effective to manufacture and install. Further, the retention system 200 includes the retention arm assembly 202 including the coupling member 204, the HOBO device 140, the pipe positioner system 250, and the retention element 212 coupled proximal to the bottom end 134 of the drill string 118. In some examples, the drilling machine 100 may include a programming software to control a sequence of all the operations involved and all other integrating systems associated with the drilling machine 100. This retention system 200 is simple to operate and requires minimal operator involvement for holding the deck bushing 124, which may reduce operator fatigue, eliminates live work, and may improve a productivity of the operator. The retention system 200 allows easy handling of various components of the drilling machine 100 during removal / replacement of heavy work tools or hammers.

[0071] The retention system 200 along with the bit basket 142, the pipe positioner system 250, a lifting bail of the drilling machine 100, and a mast winch system of the drilling machine 100 may improve a level of safety as well as completely eliminate live work for operators. The pipe positioner system 250 guides and centers the movement of the drill string 118 along the vertical axis A1 when the retention arm assembly 202 engages with the deck bushing 124. The pipe positioner system 250 may prevent any undesired movement or shaking of the drill string 118, thereby improving retention performance of the retention system 200 to retain the deck bushing 124. In an example, the pipe positioner system 250 may support the drill string 118 even when the drill pipe 119 is worn resulting in proper retention of the deck bushing 124. Further, the pipe positioner system 250 may prevent interference of the retention arm assembly 202 with one or more components of the drilling machine 100 that may result in effective retention of the deck bushing 124. In other words, the engagement of the pipe positioner system 250 with the drill string 118 may minimize the interference of the retention arm assembly 202 with the drill string 118 and may prevent damage to the retention arm assembly 202.

[0072] The retention system 200 reduces operator efforts that may be otherwise spent on manually coupling and removing conventional horseshoe tools with the deck bushing 124. Moreover, the retention system 200 described herein may also reduce time required for removal / replacement of work tools or hammers. Further, the retention system 200 may improve an operating time and an efficiency of the drilling machine 100 by reducing time required for removal / replacement of work tools and hammers. Furthermore, the retention system 200 may be implemented on existing drilling machines.

[0073] FIG. 10 is a flowchart of a method 1000 for retaining the deck bushing 124 of the drilling machine 100. Referring to FIGS. 1 to 10, at step 1002, the pipe positioner system 250 is engaged with the drill string 118 of the drilling machine 100 to guide and center the movement of the drill string 118 along the vertical axis A1. At step 1004, the drill string 118 is raised such that the work tool 120, 121 of the drilling machine 100 is raised above the mast base plate 125 of the drilling machine 100.

[0074] At step 1006, the HOBO device 140 is moved from the retracted position R1 to the extended position R2 towards the drill string 118 to facilitate the inspection and / or the replacement of the work tool 120, 121 from the drill string 118 of the drilling machine 100.

[0075] At step 1008, the retention arm assembly 202 of the drilling machine 100 is engaged with the deck bushing 124 based on the movement of the HOBO device 140 from the retracted position R1 to the extended position R2. The retention arm assembly 202 is coupled with the HOBO device 140 proximal to the top surface 144 of the HOBO device 140.

[0076] The deck bushing 124 defines the upper end 126 and the lower end 128 opposite the upper end 126. The deck bushing 124 includes the flange 130 at the upper end 126, and the bottom surface 132 defined at the lower end 128. Further, at the step 1008, the one or more arms 206 of the retention arm assembly 202 engage with the flange 130 of the deck bushing 124 or the bottom surface 132 of the deck bushing 124.

[0077] At step 10108, the retention arm assembly 202 retains the deck bushing 124 in the raised state based on the engagement of the retention arm assembly 202 with the deck bushing 124 to facilitate the inspection and / or the replacement of the work tool 120, 121 from the drill string 118 of the drilling machine 100.

[0078] At step 1012, the retention element 212, 712, 812, 912 of the drilling machine 100 engages with the deck bushing 124 after the inspection and / or the replacement of the work tool 120, 121 from the drill string 118 of the drilling machine 100. The retention element 212, 712, 812, 912 is coupled to the drill string 118 proximal to the bottom end 134 of the drill string 118.

[0079] At step 1014, the retention element 212, 712, 812, 912 retains the deck bushing 124 on the drill string 118 based on the engagement of the retention element 212, 712, 812, 912 with the deck bushing 124.

[0080] At step 1016, the HOBO device 140 is moved from the extended position R2 to the retracted position R1.

[0081] At step 1018, the deck bushing 124 reseats on the mast base plate 125. At step 1020, the drill string 118 of the drilling machine 100 is lowered to the Ready-To-Drill state or the Ready-To-Tram state.

[0082] It should be noted that the steps 1002, 1004, 1006, 1008, 1010, 1012, 1014, 1016, 1018, 1020 of the method 1000 may be performed in a sequence that is different from that explained in relation to FIG. 10. Further, various steps 1002, 1004, 1006, 1008, 1010, 1012, 1014, 1016, 1018, 1020 can be performed together.

[0083] While aspects of the present disclosure have been particularly shown and described with reference to the embodiments above, it will be understood by those skilled in the art that various additional embodiments may be contemplated by the modification of the disclosed machines, systems, and methods without departing from the spirit and scope of the disclosure. Such embodiments should be understood to fall within the scope of the present disclosure as determined based upon the claims and any equivalents thereof.

Examples

Embodiment Construction

[0023]Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0024]Referring to FIG. 1, a schematic side view of an exemplary drilling machine 100 is illustrated. In the illustrated embodiment of FIG. 1, the drilling machine 100 is a rotary drilling machine. However, the drilling machine 100 may embody any other type of drilling machine, without any limitations. The drilling machine 100 may be a manual, an autonomous, or a semi-autonomous work machine. The drilling machine 100 may be used to perform one or more drilling operations, such as drilling holes, mining blast holes, geothermal wells, and the like. The drilling machine 100 defines a vertical axis A1.

[0025]As shown in FIG. 1, the drilling machine 100 includes a frame 102. The frame 102 may be supported on a ground surface by a transport mechanism, such as crawler tracks 104. The crawler tracks 104 may allow the drilling machine 100 to maneuver on ground surfaces t...

TECHNICAL FIELD

[0001] The present disclosure relates to a drilling machine, and more particularly, to a retention system for retaining a deck bushing of the drilling machine and a method of retaining the deck bushing of the drilling machine.BACKGROUND

[0002] A drilling machine includes a drill string having a work tool for performing drilling operations at a worksite. The drill string includes one or more connected drill pipes, cross-over adaptors, and the work tool which is connected to a bottom of a formation. The work tool may include a rotary drill bit or a down-the-hole drill bit. The drill pipe is connected to a rotary head of the drilling machine for performing a drilling operation. Further, a drill pipe adaptor many a times connects the work tool with the drill pipe.

[0003] The drilling machine includes a deck bushing that provides horizontal stabilization to the drill string as the drill string passes through a deck of the drilling machine. The deck bushing is disposed around the drill string and guides the drill string during drilling. When the work tool is to be inspected and / or replaced, a manual procedure is employed to prevent the deck bushing from slipping out of the drill string. Further, the deck bushing is to be retained a few inches above the work tool during a replacement process of the work tool. Conventionally, operators many a times have to manually lift the heavy deck bushing.

[0004] The manual procedure of holding the deck bushing in contact with the drill string includes halting of the drilling operation and manually inserting a horseshoe plate to secure the deck bushing on the drill string. Subsequently, an operator returns to an operator station of the drilling machine to continue the replacement process of the work tool. Further, after the work tool is replaced, the operator has to manually disengage the horseshoe tool from the deck bushing. Such a manual procedure of retaining the deck bushing is time-consuming as it involves multiple process steps, live work, involves considerable operator involvement, and may cause operator fatigue.

[0005] U.S. Pat. No. 11,142,970 describes a bit changer assembly that includes a bit basket actuator assembly configured to be coupled to a drill rig. The bit basket actuator assembly includes an actuator, a guiderail, and a bit basket that is movably coupled to the guiderail via actuation of the actuator. The bit changer assembly also includes a bit carousel configured to be coupled to the drill rig, such that the bit carousel is rotatably and vertically moveable relative to the drill rig.SUMMARY OF THE DISCLOSURE

[0006] In an aspect of the present disclosure, a retention system for retaining a deck bushing of a drilling machine is provided. The deck bushing is movable relative to a drill string of the drilling machine. The retention system includes a hydraulically operated breakout (HOBO) device to facilitate an inspection and / or a replacement of a work tool from the drill string of the drilling machine. The HOBO device is movable between a retracted position and an extended position. The HOBO defines a top surface. The retention system also includes a retention arm assembly coupled with the HOBO device proximal to the top surface of the HOBO device. When the HOBO device is in the extended position, the retention arm assembly is engaged with the deck bushing to retain the deck bushing in a raised state to facilitate the inspection and / or the replacement of the work tool from the drill string of the drilling machine. When the HOBO device is in the retracted position, the retention arm assembly is disengaged from the deck bushing. The retention system further includes a retention element coupled proximal to a bottom end of the drill string. When the HOBO device is in the retracted position and the retention arm assembly is disengaged from the deck bushing after the inspection and / or replacement of the work tool from the drill string, the retention element is in engagement with the deck bushing to retain the deck bushing on the drill string.

[0007] In another aspect of the present disclosure, a drilling machine is provided. The drilling machine includes a frame. The drilling machine also includes a mast system supported by the frame. The drilling machine further includes a drill string. The drilling machine includes a work tool coupled to the drill string. The drilling machine also includes a deck bushing movable relative to the drill string between a raised state and a lowered state. The drilling machine further includes a retention system for retaining the deck bushing in the raised state to facilitate an inspection and / or a replacement of the work tool from the drill string. The retention system includes a hydraulically operated breakout (HOBO) device to facilitate the inspection and / or the replacement of the work tool from the drill string. The HOBO device is movable between a retracted position and an extended position. The HOBO defines a top surface. The retention system also includes a retention arm assembly coupled with the HOBO device proximal to the top surface of the HOBO device. When the HOBO device is in the extended position, the retention arm assembly is engaged with the deck bushing to retain the deck bushing in the raised state to facilitate the inspection and / or the replacement of the work tool from the drill string of the drilling machine. When the HOBO device is in the retracted position, the retention arm assembly is disengaged from the deck bushing. The retention system further includes a retention element coupled proximal to a bottom end of the drill string. When the HOBO device is in the retracted position and the retention arm assembly is disengaged from the deck bushing after the inspection and / or replacement of the work tool from the drill string, the retention element is in engagement with the deck bushing to retain the deck bushing on the drill string.

[0008] In yet another aspect of the present disclosure, a method for retaining a deck bushing of a drilling machine is provided. The method includes engaging a pipe positioner system with a drill string of the drilling machine to guide and center a movement of the drill string along a vertical axis. The method also includes raising the drill string such that a work tool of the drilling machine is raised above a mast base plate of the drilling machine. The method further includes moving a hydraulically operated breakout (HOBO) device from a retracted position to an extended position towards the drill string to facilitate an inspection and / or a replacement of the work tool from the drill string of the drilling machine. The method includes engaging a retention arm assembly of the drilling machine with the deck bushing based on the movement of the HOBO device from the retracted position to the extended position. The retention arm assembly is coupled with the HOBO device proximal to a top surface of the HOBO device. The method also includes retaining, by the retention arm assembly, the deck bushing in a raised state based on an engagement of the retention arm assembly with the deck bushing to facilitate the inspection and / or the replacement of the work tool from the drill string of the drilling machine. The method further includes engaging a retention element of the drilling machine with the deck bushing after the inspection and / or the replacement of the work tool from the drill string of the drilling machine. The retention element is coupled to the drill string proximal to a bottom end of the drill string. The method includes retaining, by the retention element, the deck bushing on the drill string based on an engagement of the retention element with the deck bushing. The method also includes moving the HOBO device from the extended position to the retracted position. The method further includes reseating the deck bushing on a mast base plate. The method further includes lowering the drill string of the drilling machine to a Ready-To-Drill state or a Ready-To-Tram state.

[0009] Other features and aspects of this disclosure will be apparent from the following description and the accompanying drawings.BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG. 1 is a schematic side view of an exemplary drilling machine;

[0011] FIG. 2A is a perspective view of a drill string of the drilling machine of FIG. 1;

[0012] FIG. 2B is a perspective view of a lower sub adaptor of the drill string of FIG. 2A;

[0013] FIG. 2C is a schematic cross-sectional view of a deck bushing of the drilling machine in contact with the drill string of FIG. 2A;

[0014] FIG. 3A is a schematic top view of a portion of the drilling machine of FIG. 1 illustrating a retention system for retaining a deck bushing of the drilling machine, according to an embodiment of the present disclosure;

[0015] FIG. 3B is a top sectional view of a portion of the drilling machine illustrating a pipe positioner system of the retention system of FIG. 3A;

[0016] FIG. 4 is a top view illustrating a retention arm assembly of the retention system of FIG. 3A engaged with the deck bushing of the drilling machine;

[0017] FIG. 5 is a sectional side view illustrating the retention arm assembly of the retention system of FIG. 3A engaged with the deck bushing of the drilling machine;

[0018] FIG. 6 is a schematic side view illustrating a retention element of the retention system of FIG. 3A engaged with the deck bushing of the drilling machine, according to an embodiment of the present disclosure;

[0019] FIG. 7 is a schematic view illustrating a retention element of the retention system of FIG. 3A, according to another embodiment of the present disclosure;

[0020] FIG. 8 is a schematic view illustrating a retention element of the retention system of FIG. 3A, according to yet another embodiment of the present disclosure;

[0021] FIG. 9 is a schematic view illustrating a retention element of the retention system of FIG. 3A, according to an embodiment of the present disclosure; and

[0022] FIG. 10 is a flowchart of a method for retaining the deck bushing of the drilling machine of FIG. 1, according to an embodiment of the present disclosure.DETAILED DESCRIPTION

[0023] Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0024] Referring to FIG. 1, a schematic side view of an exemplary drilling machine 100 is illustrated. In the illustrated embodiment of FIG. 1, the drilling machine 100 is a rotary drilling machine. However, the drilling machine 100 may embody any other type of drilling machine, without any limitations. The drilling machine 100 may be a manual, an autonomous, or a semi-autonomous work machine. The drilling machine 100 may be used to perform one or more drilling operations, such as drilling holes, mining blast holes, geothermal wells, and the like. The drilling machine 100 defines a vertical axis A1.

[0025] As shown in FIG. 1, the drilling machine 100 includes a frame 102. The frame 102 may be supported on a ground surface by a transport mechanism, such as crawler tracks 104. The crawler tracks 104 may allow the drilling machine 100 to maneuver on ground surfaces to a desired location for performing drilling operations. Alternatively, the drilling machine 100 may include wheels instead of the crawler tracks 104. The frame 102 includes one or more jacks (not shown herein) for supporting and leveling the drilling machine 100 on the ground surface during drilling operations.

[0026] The drilling machine 100 also includes a machinery 106. The frame 102 may support the machinery 106, which may include various components (not shown), such as, a power source (for example, an engine, a battery system, and / or a fuel system), motors, pumps, air compressors, and / or any other equipment necessary to supply power to operate the drilling machine 100. The frame 102 further supports an operator cabin 108, from which an operator may maneuver and control the drilling machine 100.

[0027] The drilling machine 100 includes a mast system 110 supported on the frame 102. The mast system 110 extends along the vertical axis A1. The mast system 110 includes a mast weldment 112 coupled to the frame 102.

[0028] The drilling machine 100 further includes a drill head 114 movable relative to the mast system 110. The drill head 114 is movable along the vertical axis A1 and is supported on the mast system 110. The machinery 106 may provide power to operate the drill head 114 relative to the mast system 110. In some examples, the drilling machine 100 may include one or more motors (not shown) associated with the drill head 114.

[0029] Referring now to FIG. 2A, the drilling machine 100 includes a drill string 118. Only a portion of the drill string 118 is illustrated in FIG. 2A. The drill head 114 (see FIG. 1) may support the drill string 118. The drill head 114 may couple to, and rotate, the drill string 118 for performing the drilling operation. The drill string 118 defines a bottom end 134. The drilling machine 100 further includes a work tool 120 coupled to the drill string 118. Specifically, the work tool 120 is coupled to the drill string 118, proximal to the bottom end 134 of the drill string 118. The work tool 120 may allow drilling into various surfaces. The work tool 120 may include a drill bit. For example, the work tool 120 may include a rotary drill bit or a down-the-hole (DTH) drill bit. In the illustrated embodiment of FIG. 2A, the work tool 120 is embodied as the rotary drill bit. Alternatively, the work tool 120 may embody any other work tool that can be used to perform drilling operations.

[0030] The drill string 118 includes a drill pipe 119 (shown in FIG. 9), an upper sub adaptor (not shown), and a lower sub adaptor 122. The lower sub adaptor 122 couples the work tool 120 with the drill string 118. In other words, the lower sub adaptor 122 is disposed between the drill pipe 119 and the work tool 120 and allows coupling of the work tool 120 with the drill string 118.

[0031] Referring now to FIGS. 2A and 2B, the lower sub adaptor 122 includes a first end 136 and a second end 138. The lower sub adaptor 122 is coupled with the drill pipe 119 (see FIG. 9) proximal to the first end 136. Further, the lower sub adaptor 122 is coupled with the work tool 120 proximal to the second end 138.

[0032] Referring to FIGS. 2A and 2C, the drilling machine 100 includes a deck bushing 124 movable relative to the drill string 118. The deck bushing 124 is mounted on a mast base plate 125 (shown in FIG. 3A). The deck bushing 124 guides and supports the drill string 118 during the drilling operation. In an example, when the drilling machine 100 trams from hole to hole, the deck bushing 124 fits into the mast base plate 125. Further, the work tool 120, that is mounted to the second end 138 of the lower sub adaptor 122, lies below the mast base plate 125 to perform the drilling operation. The deck bushing 124 is movable relative to the drill string 118 of the drilling machine 100 between a raised state and a lowered state. In the lowered state of the deck bushing 124, the deck bushing 124 may fit flat on to the mast base plate 125. The deck bushing 124 is moved to the raised state during an inspection and / or a replacement of the work tool 120 from the drill string 118 of the drilling machine 100. Specifically, the drill string 118 is raised to a pre-defined height during the inspection and / or the replacement of the work tool 120 from the drill string 118. The deck bushing 124 defines an upper end 126 and a lower end 128 opposite the upper end 126. The deck bushing 124 includes a flange 130 at the upper end 126, and a bottom surface 132 defined at the lower end 128. Further, the deck bushing 124 defines an inner diameter D1.

[0033] The deck bushing 124 is embodied as a plain sleeve type deck bushing in FIG. 2C. However, the deck bushing 124 may embody a ball bearing sleeve type deck bushing. The deck bushing 124 includes an inner sleeve 127 and an outer sleeve 129. The inner sleeve 127 rotates with respect to the outer sleeve 129. The outer sleeve 129 may remain static on the drill string 118 during the drilling operation.

[0034] With reference to FIG. 3A, the drilling machine 100 further includes a retention system 200 for retaining the deck bushing 124 in the raised state to facilitate the inspection and / or the replacement of the work tool 120 (see FIG. 2A) from the drill string 118 (see FIG. 2A) of the drilling machine 100. The retention system 200 includes a hydraulically operated breakout (HOBO) device 140 to facilitate the inspection and / or the replacement of the work tool 120 from the drill string 118 of the drilling machine 100. The HOBO device 140 is movable between a retracted position R1 and an extended position R2 (shown in FIGS. 4 and 5). The HOBO device 140 is shown in the retracted position R1 in FIG. 3A and in the extended position R2 in FIGS. 4 and 5.

[0035] As shown in FIG. 3A, the HOBO device 140 defines a top surface 144. The drilling machine 100 includes a first actuator 146. When the first actuator 146 is actuated, the first actuator 146 moves the HOBO device 140 from the retracted position R1 to the extended position R2. The first actuator 146 is a hydraulic actuator herein.

[0036] The HOBO device 140 includes a conventional HOBO wrench including components and mechanisms known to persons skilled in the art. The HOBO device 140 is a wrench that may be used to grip the drill string 118, and occasionally the work tool 120, to assist in a removal / attachment of the work tool 120 with the drill string 118. Specifically, the HOBO device 140 may grip the lower sub adaptor 122 of the drill string 118. The HOBO device 140 includes a number of gripping surfaces 150 (only one of which is shown in FIG. 3A) that may engage with the drill string 118 when the HOBO device 140 is in the extended position R2. Specifically, the HOBO device 140 includes a pair of jaws 148. The jaws 148 define the gripping surfaces 150 that engage with the drill string 118. The gripping surfaces 150 may be flat surfaces that engage with flat surfaces (not shown) on the drill string 118.

[0037] The drilling machine 100 further includes a second actuator (not shown). The second actuator moves the jaws 148 of the HOBO device 140 between an engaged state and a disengaged state. When the second actuator extends, the second actuator causes the jaws 148 to engage with the drill string 118. Thus, in the engaged state, the jaws 148 engage with the drill string 118. Further, when the second actuator retracts, the second actuator disengages the jaws 148 from the drill string 118. Thus, in the disengaged state, the jaws 148 are disengaged from the drill string 118. The second actuator may be a hydraulic actuator.

[0038] Referring now to FIG. 3B, the retention system 200 further includes a pipe positioner system 250. The pipe positioner system 250 is coupled to the mast weldment 112. The pipe positioner system 250 contacts the drill string 118 to guide and center a movement of the drill string 118 along the vertical axis A1. Specifically, the pipe positioner system 250 contacts the drill pipe 119 (see FIG. 9). It should be noted that the vertical axis A1 is defined as an axis that passes through a drill center hole (not shown) on the mast base plate 125 (see FIG. 3A). In other words, the pipe positioner system 250 centers and guides the drill string 118 to drill a hole (not shown) that is perpendicular to the mast base plate 125 and is straight in geometry.

[0039] The pipe positioner system 250 includes one or more support arms 252, 254 that contacts with the drill string 118 to facilitate the movement of the drill string 118 along the vertical axis A1. Specifically, the one or more support arms 252, 254 includes a first support arm 252 and a second support arm 254. Each of the first support arm 252 and the second support arm 254 are distant to each other and are disposed at an angle from each other. In some examples, each of the first support arm 252 and the second support arm 254 may be disposed opposite to each other. The first support arm 252 includes a first arm 261 and a first roller 260. The first roller 260 is coupled to the first arm 261 via one or more fastening means 264. The second support arm 254 includes a second arm 263 and a second roller 262. The second roller 262 is coupled to the second arm 263 via one or more fastening means 266. In some examples, the one or more fastening means 264, 266 may include a bolt, a screw, a rivet, and the like. One end of each of the first arm 261 and the second arm 263 is coupled with the mast system 110, whereas another end of each of the first arm 261 and the second arm 263 engages with the drill string 118.

[0040] The pipe positioner system 250 further includes a first actuator 256 associated with the first support arm 252 and a second actuator 258 associated with the second support arm 254. The first actuator 256 is coupled to the first arm 261 at one end and to the mast system 110 at another end. The second actuator 258 is coupled to the second arm 263 at one end and to the mast system 110 at another end.

[0041] Based on an extension of the first actuator 256, the first support arm 252 contacts with the drill string 118. In other words, based on the extension of the first actuator 256, the first support arm 252 moves angularly such that the first roller 260 contacts with the drill string 118. Further, based on an extension of the second actuator 258, the second support arm 254 contacts with the drill string 118. In other words, based on the extension of the second actuator 258, the second support arm 254 moves angularly such that the second roller 262 contacts with the drill string 118. It should be noted that, the pipe positioner system 250 may include one or more arms with guiding elements of various geometries other than rollers 260, 262 without any limitations.

[0042] Referring now to FIGS. 3A, 4, and 5, the retention system 200 also includes a retention arm assembly 202 coupled with the HOBO device 140 proximal to the top surface 144 of the HOBO device 140. When the HOBO device 140 is in the extended position R2, the retention arm assembly 202 is engaged with the deck bushing 124 to retain the deck bushing 124 in the raised state to facilitate the inspection and / or the replacement of the work tool 120 (see FIG. 2A) from the drill string 118 (see FIG. 2A) of the drilling machine 100. The retention arm assembly 202 is shown as engaged with the deck bushing 124 in FIGS. 4 and 5. Further, in a case wherein the replacement of the work tool 120 (i.e., the rotary drill bit) is required, the HOBO device 140 breaks a joint between the work tool 120 and the lower sub adaptor 122, while the retention arm assembly 202 retains the deck bushing 124 in the raised state.

[0043] Furthermore, the pipe positioner system 250 (see FIG. 3B) contacts the drill string 118 to guide and center the movement of the drill string 118 along the vertical axis A1 (see FIG. 3B) before the retention arm assembly 202 engages with the deck bushing 124. In other words, the pipe positioner system 250 guides the movement of the drill string 118 along the vertical axis A1 and minimizes the shifting of the drill pipe 119 (see FIG. 9) and / or the drill string 118 away from a drill central axis before the retention arm assembly 202 engages with the deck bushing 124.

[0044] When the HOBO device 140 is in the retracted position R1, the retention arm assembly 202 is disengaged from the deck bushing 124. The retention arm assembly 202 is shown as disengaged from the deck bushing 124 in FIG. 3A.

[0045] The retention arm assembly 202 includes a coupling member 204 that couples the retention arm assembly 202 with the top surface 144 of the HOBO device 140. The coupling member 204 extends orthogonally, along the vertical axis A1 (see FIG. 1), relative to the top surface 144 of the HOBO device 140. The retention arm assembly 202 also includes one or more arms 206 integral with the coupling member 204. The one or more arms 206 are spaced apart from the top surface 144 of the HOBO device 140 by the coupling member 204. In the illustrated example of FIG. 3A, the one or more arms 206 includes a pair of arms 206. The pair of arms 206 are hereinafter interchangeably referred to as the “one or more arms 206”.

[0046] The pair of arms 206 define a U-shape herein. Alternatively, the pair of arms 206 may have any other shape that may allow retention of the deck bushing 124. Further, the pair of arms 206 are spaced apart from each other such that a slot 208 is defined therebetween. When the HOBO device 140 is in the extended position R2, the pair of arms 206 engage with the deck bushing 124 to retain the deck bushing 124 in the raised state for the inspection and / or the replacement of the work tool 120 from the drill string 118 of the drilling machine 100. Further, when the HOBO device 140 is in the extended position R2, the pair of arms 206 engage with the flange 130 of the deck bushing 124 or the bottom surface 132 of the deck bushing 124. Further, when the pair of arms 206 engage with the flange 130 of the deck bushing 124, the slot 208 defined by the pair of arms 206 receives the deck bushing 124 therein. Alternatively, the pair of arms 206 may engage with the bottom surface 132 of the deck bushing 124. When the pair of arms 206 engage with the bottom surface 132 of the deck bushing 124, the slot 208 defined by the pair of arms 206 receive a portion of the lower sub adaptor 122 therein.

[0047] The retention system 200 further includes one or more fastening members 210 (only one of which is illustrated in FIG. 5) that removably couple the coupling member 204 of the retention arm assembly 202 with the top surface 144 of the HOBO device 140. The fastening members 210 may include bolts, pins, screws, and the like. The retention system 200 may additionally include brackets or couplers that may assist in coupling of the coupling member 204 with the top surface 144. It may be contemplated that the retention arm assembly 202 may be coupled with the top surface 144 of the HOBO device 140 using any other technique known to persons skilled in the art. For example, the retention arm assembly 202 may be coupled with the top surface 144 of the HOBO device 140 by welding, soldering, brazing, and the like.

[0048] Referring to FIG. 6, the retention system 200 further includes a retention element 212 coupled proximal to the bottom end 134 of the drill string 118. Specifically, the retention element 212 is disposed at the second end 138 of the lower sub adaptor 122. The retention element 212 may be integral with the drill string 118 or fixedly coupled with the drill string 118. In an example, the retention element 212 may be fixedly coupled with the lower sub adaptor 122 by welding, soldering, brazing, and the like. In other examples, the retention element 212 may be removably coupled with the drill string 118 for example, via one or more fastening elements.

[0049] The retention element 212 defines a maximum diameter D2 that is greater than the inner diameter D1 (see FIG. 2C) of the deck bushing 124. In some examples, the maximum diameter D2 may be greater than the inner diameter D1 but less than an outer diameter defined at the bottom surface 132 of the deck bushing 124. Further, a diameter D6 of the work tool 120 is greater than the maximum diameter D2.

[0050] When the HOBO device 140 is in the retracted position R1 (see FIG. 3A) and the retention arm assembly 202 (see FIG. 3A) is disengaged from the deck bushing 124 after the inspection and / or replacement of the work tool 120 from the drill string 118, the retention element 212 is in engagement with the deck bushing 124 to retain the deck bushing 124 on the drill string 118. The retention element 212 retains the deck bushing 124 in the lowered state after the inspection and / or the replacement of the work tool 120 from the drill string 118. In other words, after the inspection and / or the replacement of the work tool 120 from the drill string 118, the drill string 118 (along with the retention element 212) is raised. Further, the retention element 212 engages with the deck bushing 124 to retain the deck bushing 124 on the drill string 118, soon after the HOBO device 140 moves to the retracted position R1 from the extended position R2 and the retention arm assembly 202 is disengaged from the deck bushing 124.

[0051] Further, a location of the retention element 212 is based on a type of the work tool 120 associated with the drilling machine 100. Specifically, in the illustrated embodiment of FIG. 6, the work tool 120 is the rotary drill bit, and the retention element 212 is disposed at the second end 138 of the lower sub adaptor 122. The retention element 212 has a stepped profile herein. The retention element 212 includes a first portion 216 and a second portion 218. The first portion 216 has an outer diameter D3 that is lesser than the inner diameter D1 of the deck bushing 124. When the deck bushing 124 engages with the retention element 212, the first portion 216 is received within the deck bushing 124. Further, the second portion 218 defines the maximum diameter D2 that is greater than the outer diameter D3 of the first portion 216 and the inner diameter D1 of the deck bushing 124, such that the bottom surface 132 rests on the second portion 218 to engage the deck bushing 124 with the retention element 212.

[0052] As shown in FIG. 6, the retention element 212 defines a number of passages 214 to purge out air and / or debris. Specifically, the number of passages 214 may purge out air and / or debris, during the drilling operation. Specifically, the debris may be drilling debris generated during the drilling operation. The passages 214 extend along the vertical axis A1 (see FIG. 1). The retention element 212 may define any number of passages 214, such as three, four, five, six, and so on, as per application attributes.

[0053] FIG. 7 is a side view illustrating a retention element 712 of the retention system 200 of FIG. 3A, according to another embodiment of the present disclosure. In the embodiment illustrated in FIG. 7, a work tool 121 associated with the drilling machine 100 (see FIG. 1) is the DTH drill bit.

[0054] The drill string 118 also includes a hammer 123. The hammer 123 is disposed between the lower sub adaptor 122 (see FIG. 6) and the work tool 121. Further, in the illustrated embodiment of FIG. 7, the retention element 712 is disposed on the hammer 123 instead of the lower sub adaptor 122. The retention element 712 is disposed proximal to an end of the hammer 123 to which the work tool 121 is coupled. The hammer 123 includes a chuck 718. The retention element 712 is disposed proximal to the chuck 718. In other examples, the retention element 712 may be disposed midway along the hammer 123, or at any other location on the hammer 123, without any limitations. The retention element 712 may be integral with the drill string 118 or fixedly coupled with the drill string 118. In an example, the retention element 712 may be fixedly coupled with the hammer 123 by welding, soldering, brazing, and the like. In other examples, the retention element 712 may be removably coupled with the drill string 118 for example, via one or more fastening elements.

[0055] The retention element 712 is designed as a collar herein. The retention element 712 includes a number of engaging portions 716. The retention element 712 may include any number of engaging portions 716, such as three, four, five, six, and so on, based on application attributes. The retention element 712 defines a maximum diameter D5 that is greater than the inner diameter D1 (see FIG. 2C) of the deck bushing 124 (see FIG. 6), such that the bottom surface 132 (see FIG. 6) of the deck bushing 124 can rest on the engaging portions 716 to engage the deck bushing 124 with the retention element 712. Specifically, the number of engaging portions 716 together define the maximum diameter D5. Further, a diameter D7 of the work tool 121 is greater than the maximum diameter D5.

[0056] The retention element 712 defines a number of passages 714 to purge out air and / or debris there through. Specifically, the number of passages 714 may purge out air and / or debris during the drilling operation. The passages 714 extend along the vertical axis A1 (see FIG. 1). Each passage 714 is defined between adjacent engaging portions 716. The retention element 712 may define any number of passages 714, such as three, four, five, six, and so on, based on the number of engaging portions 716.

[0057] FIG. 8 is a perspective view illustrating a retention element 812 of the retention system 200 of FIG. 3A, according to yet another embodiment of the present disclosure. In the illustrated embodiment of FIG. 8, the retention element 812 includes a number of projections 816. The retention element 812 is disposed proximal to the second end 138 of the lower sub adaptor 122. In other examples, the retention element 812 may be disposed midway along the lower sub adaptor 122, or at any other location on the lower sub adaptor 122, without any limitations. The retention element 812 may be integral with the drill string 118 or fixedly coupled with the drill string 118. In an example, the retention element 812 may be fixedly coupled with the lower sub adaptor 122 by welding, soldering, brazing, and the like. In other examples, the retention element 812 may be removably coupled with the drill string 118 for example, via one or more fastening elements.

[0058] The retention element 812 may include any number of projections 816, such as three, four, five, six, and so on, based on application attributes. The retention element 812 defines a maximum diameter D8 that is greater than the inner diameter D1 (see FIG. 2C) of the deck bushing 124 (see FIG. 6), such that the bottom surface 132 (see FIG. 6) of the deck bushing 124 rests on the projections 816 to engage the deck bushing 124 with the retention element 812. Specifically, the number of projections 816 together define the maximum diameter D8. The retention element 812 can be used with the rotary drill bit or the DTH drill bit. Further, the diameter D6, D7 of the work tool 120, 121 (see FIGS. 6 and 7) is greater than the maximum diameter D8.

[0059] The retention element 812 defines a number of passages 814 to purge out air and / or debris therethrough. Specifically, the number of passages 814 may purge out air and / or debris during the drilling operation. Each passage 814 is defined between adjacent projections 816. The retention element 812 may define any number of passages 814, such as three, four, five, six, and so on, based on the number of projections 816.

[0060] FIG. 9 is a schematic view illustrating a retention element 912 of the retention system 200 of FIG. 3A, according to an embodiment of the present disclosure. In the illustrated embodiment of FIG. 9, the work tool 121 is the DTH drill bit. The drill string 118 also includes the hammer 123. The hammer 123 is disposed between the lower sub adaptor 122 and the work tool 121. Further, in the illustrated embodiment of FIG. 9, the retention element 912 is disposed on the lower sub adaptor 122. The retention element 912 is disposed on the lower sub adaptor 122 for retention of the deck bushing 124 (see FIG. 3A) on the drill string 118 when the hammer 123 is to be replaced. Specifically, the retention element 912 is disposed proximal to the second end 138 of the lower sub adaptor 122. In other examples, the retention element 912 may be disposed midway along lower sub adaptor 122, or at any other location on the lower sub adaptor 122, without any limitations. The retention element 912 may be integral with the drill string 118 or fixedly coupled with the drill string 118. In an example, the retention element 912 may be fixedly coupled with the lower sub adaptor 122 by welding, soldering, brazing, and the like. In other examples, the retention element 912 may be removably coupled with the drill string 118 for example, via one or more fastening elements.

[0061] The retention element 912 is designed as a collar herein. The retention element 912 includes a number of engaging portions 916. The retention element 912 may include any number of engaging portions 916, such as three, four, five, six, and so on, based on application attributes. The engaging portions 916 defines a maximum diameter D9 that is greater than the inner diameter D1 (see FIG. 2C) of the deck bushing 124, so that the bottom surface 132 (see FIG. 6) of the deck bushing 124 can rest on the engaging portions 916 to engage the deck bushing 124 with the retention element 912. Specifically, the number of engaging portions 916 together define the maximum diameter D9. The retention element 912 can be used with rotary drill bits or DTH drill bits. Further, the diameter D7 of the work tool 121 is greater than the maximum diameter D9 of the retention element 912.

[0062] The retention element 912 defines a number of passages 914 to purge out air and / or debris therethrough. Specifically, the number of passages 914 may purge out air and / or debris during the drilling operation. The passages 914 extend along the vertical axis A1 (see FIG. 1). Each passage 914 is defined between adjacent engaging portions 916. The retention element 912 may include any number of passages 914, such as three, four, five, six, and so on, based on the number of engaging portions 916.

[0063] Referring to FIGS. 6 to 9, the retention element 212, 712, 812, 912 may be used to break a joint between the work tools 120, 121 or the hammer 123 and the lower sub adaptor 122 in an above-the-deck process, while a replacement of the work tools 120, 121 or the hammer 123 may be performed using a below-the-deck process.

[0064] Referring to FIGS. 2A to 6, in one exemplary application, the pipe positioner system 250 engages with the drill string 118. Further, when the work tool 120 is to be inspected and / or replaced, the drill string 118, along with the deck bushing 124, is raised to a desired height. Specifically, the drill string 118 is raised to the desired height such that the work tool 120 is raised above the mast base plate 125 to enable a bit basket 142 (shown in FIGS. 6 and 7) of the drilling machine 100 to slide below the work tool 120 in case of inspection and / or replacement of the work tool 120. In some examples, the bit basket 142 may be a hydraulically operated bit basket. It should be noted that, in such cases the deck bushing 124 rides on the work tool 120 and is in alignment with the retention arm assembly 202 for engagement. In other words, when the drill string 118 is being raised, the deck bushing 124 is in the lowered state and is engaged with the retention element 212. Further, the first actuator 146 of the HOBO device 140 is actuated to move the HOBO device 140 to the extended position R2. Based on the movement of the HOBO device 140 to the extended position R2, the retention arm assembly 202 is engaged with the deck bushing 124. The drill string 118 is moved downwards so that the work tool 120 engages with the bit basket 142. At this time, the retention arm assembly 202 is still engaged with the deck bushing 124 to retain the deck bushing 124 in the raised state for the inspection and / or the replacement of the work tool 120 from the drill string 118 of the drilling machine 100. Subsequently, the jaws 148 of the HOBO device 140 are moved to the engaged state to break a joint between the work tool 120 and the lower sub adaptor 122, while the work tool 120 will be retained in the bit basket 142 and will be replaced with a new work tool.

[0065] Even after the joint between the work tool 120 and the lower sub adaptor 122 is broken, the retention arm assembly 202 remains engaged till the work tool 120 is removed and replaced with the new work tool. After the joint between the work tool 120 and the lower sub adaptor 122 is broken, the jaws 148 are moved to the disengaged state. After the work tool 120 replacement on the drill string 118, the drill string 118 is raised up till the deck bushing 124 rides on the work tool 120 once again. Then the HOBO device 140 is moved to the retracted position R1, which causes the retention arm assembly 202 to disengage from the deck bushing 124. Disengagement of the retention arm assembly 202 from the deck bushing 124 causes the deck bushing 124 to move to the lowered position, thereby engaging the deck bushing 124 with the retention element 212. The work tool 120 is then removed from the bit basket 142 and replaced with a new work tool. Subsequently, the new work tool is coupled with the drill string 118. Further, it should be noted that, after the inspection and / or the replacement of the work tool 120, the deck bushing 124 is reseated on the mast base plate 125 of the drilling machine 100. Furthermore, the drill string 118 is also lowered to a Ready-To-Drill state or a Ready-To-Tram state.

[0066] It should be noted that the process of breaking the joint between the work tool 120 and the lower sub adaptor 122 as explained above is merely an example, and any other technique or components may be used to perform the intended function.

[0067] It is to be understood that individual features shown or described for one embodiment may be combined with individual features shown or described for another embodiment. The above-described implementation does not in any way limit the scope of the present disclosure. Therefore, it is to be understood although some features are shown or described to illustrate the use of the present disclosure in the context of functional segments, such features may be omitted from the scope of the present disclosure without departing from the spirit of the present disclosure as defined in the appended claims.INDUSTRIAL APPLICABILITY

[0068] The present disclosure relates to the retention system 200 for the drilling machine 100. The present disclosure relates to automatic retention of the deck bushing 124 using the retention system 200 for enabling removal / replacement of the work tool 120, 121 and / or the hammer 123. The retention system 200 may be used with both manual and autonomous drilling machines. The retention system 200 may be used during above-the-deck removal / breaking of work tools 120, 121 or the hammer 123.

[0069] The retention system 200 includes the retention arm assembly 202 coupled with the top surface 144 of the HOBO device 140. The retention arm assembly 202 automatically holds and secures the deck bushing 124 on the drill string 118, thereby preventing the deck bushing 124 from slipping during the removal / replacement of work tools or hammers. The retention system 200 makes use of the HOBO device 140 that already exists on the drilling machine 100 to assist in retention of the deck bushing 124. Thus, the HOBO device 140 performs the dual purpose of breaking the joint between the work tool 120, 121 / hammer 123 and the lower sub adaptor 122 as well as assists in retention of the deck bushing 124.

[0070] The retention arm assembly 202 and the retention element 212, 712, 812, 912 have a simple design and are therefore cost-effective to manufacture and install. Further, the retention system 200 includes the retention arm assembly 202 including the coupling member 204, the HOBO device 140, the pipe positioner system 250, and the retention element 212 coupled proximal to the bottom end 134 of the drill string 118. In some examples, the drilling machine 100 may include a programming software to control a sequence of all the operations involved and all other integrating systems associated with the drilling machine 100. This retention system 200 is simple to operate and requires minimal operator involvement for holding the deck bushing 124, which may reduce operator fatigue, eliminates live work, and may improve a productivity of the operator. The retention system 200 allows easy handling of various components of the drilling machine 100 during removal / replacement of heavy work tools or hammers.

[0071] The retention system 200 along with the bit basket 142, the pipe positioner system 250, a lifting bail of the drilling machine 100, and a mast winch system of the drilling machine 100 may improve a level of safety as well as completely eliminate live work for operators. The pipe positioner system 250 guides and centers the movement of the drill string 118 along the vertical axis A1 when the retention arm assembly 202 engages with the deck bushing 124. The pipe positioner system 250 may prevent any undesired movement or shaking of the drill string 118, thereby improving retention performance of the retention system 200 to retain the deck bushing 124. In an example, the pipe positioner system 250 may support the drill string 118 even when the drill pipe 119 is worn resulting in proper retention of the deck bushing 124. Further, the pipe positioner system 250 may prevent interference of the retention arm assembly 202 with one or more components of the drilling machine 100 that may result in effective retention of the deck bushing 124. In other words, the engagement of the pipe positioner system 250 with the drill string 118 may minimize the interference of the retention arm assembly 202 with the drill string 118 and may prevent damage to the retention arm assembly 202.

[0072] The retention system 200 reduces operator efforts that may be otherwise spent on manually coupling and removing conventional horseshoe tools with the deck bushing 124. Moreover, the retention system 200 described herein may also reduce time required for removal / replacement of work tools or hammers. Further, the retention system 200 may improve an operating time and an efficiency of the drilling machine 100 by reducing time required for removal / replacement of work tools and hammers. Furthermore, the retention system 200 may be implemented on existing drilling machines.

[0073] FIG. 10 is a flowchart of a method 1000 for retaining the deck bushing 124 of the drilling machine 100. Referring to FIGS. 1 to 10, at step 1002, the pipe positioner system 250 is engaged with the drill string 118 of the drilling machine 100 to guide and center the movement of the drill string 118 along the vertical axis A1. At step 1004, the drill string 118 is raised such that the work tool 120, 121 of the drilling machine 100 is raised above the mast base plate 125 of the drilling machine 100.

[0074] At step 1006, the HOBO device 140 is moved from the retracted position R1 to the extended position R2 towards the drill string 118 to facilitate the inspection and / or the replacement of the work tool 120, 121 from the drill string 118 of the drilling machine 100.

[0075] At step 1008, the retention arm assembly 202 of the drilling machine 100 is engaged with the deck bushing 124 based on the movement of the HOBO device 140 from the retracted position R1 to the extended position R2. The retention arm assembly 202 is coupled with the HOBO device 140 proximal to the top surface 144 of the HOBO device 140.

[0076] The deck bushing 124 defines the upper end 126 and the lower end 128 opposite the upper end 126. The deck bushing 124 includes the flange 130 at the upper end 126, and the bottom surface 132 defined at the lower end 128. Further, at the step 1008, the one or more arms 206 of the retention arm assembly 202 engage with the flange 130 of the deck bushing 124 or the bottom surface 132 of the deck bushing 124.

[0077] At step 10108, the retention arm assembly 202 retains the deck bushing 124 in the raised state based on the engagement of the retention arm assembly 202 with the deck bushing 124 to facilitate the inspection and / or the replacement of the work tool 120, 121 from the drill string 118 of the drilling machine 100.

[0078] At step 1012, the retention element 212, 712, 812, 912 of the drilling machine 100 engages with the deck bushing 124 after the inspection and / or the replacement of the work tool 120, 121 from the drill string 118 of the drilling machine 100. The retention element 212, 712, 812, 912 is coupled to the drill string 118 proximal to the bottom end 134 of the drill string 118.

[0079] At step 1014, the retention element 212, 712, 812, 912 retains the deck bushing 124 on the drill string 118 based on the engagement of the retention element 212, 712, 812, 912 with the deck bushing 124.

[0080] At step 1016, the HOBO device 140 is moved from the extended position R2 to the retracted position R1.

[0081] At step 1018, the deck bushing 124 reseats on the mast base plate 125. At step 1020, the drill string 118 of the drilling machine 100 is lowered to the Ready-To-Drill state or the Ready-To-Tram state.

[0082] It should be noted that the steps 1002, 1004, 1006, 1008, 1010, 1012, 1014, 1016, 1018, 1020 of the method 1000 may be performed in a sequence that is different from that explained in relation to FIG. 10. Further, various steps 1002, 1004, 1006, 1008, 1010, 1012, 1014, 1016, 1018, 1020 can be performed together.

[0083] While aspects of the present disclosure have been particularly shown and described with reference to the embodiments above, it will be understood by those skilled in the art that various additional embodiments may be contemplated by the modification of the disclosed machines, systems, and methods without departing from the spirit and scope of the disclosure. Such embodiments should be understood to fall within the scope of the present disclosure as determined based upon the claims and any equivalents thereof.

Examples

Embodiment Construction

[0023]Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0024]Referring to FIG. 1, a schematic side view of an exemplary drilling machine 100 is illustrated. In the illustrated embodiment of FIG. 1, the drilling machine 100 is a rotary drilling machine. However, the drilling machine 100 may embody any other type of drilling machine, without any limitations. The drilling machine 100 may be a manual, an autonomous, or a semi-autonomous work machine. The drilling machine 100 may be used to perform one or more drilling operations, such as drilling holes, mining blast holes, geothermal wells, and the like. The drilling machine 100 defines a vertical axis A1.

[0025]As shown in FIG. 1, the drilling machine 100 includes a frame 102. The frame 102 may be supported on a ground surface by a transport mechanism, such as crawler tracks 104. The crawler tracks 104 may allow the drilling machine 100 to maneuver on ground surfaces t...

Claims

1. A retention system for retaining a deck bushing of a drilling machine, the deck bushing is movable relative to a drill string of the drilling machine, the retention system comprising:a hydraulically operated breakout (HOBO) device to facilitate an inspection and / or a replacement of a work tool from the drill string of the drilling machine, wherein the HOBO device is movable between a retracted position and an extended position, and wherein the HOBO defines a top surface;a retention arm assembly coupled with the HOBO device proximal to the top surface of the HOBO device, wherein, when the HOBO device is in the extended position, the retention arm assembly is engaged with the deck bushing to retain the deck bushing in a raised state to facilitate the inspection and / or the replacement of the work tool from the drill string of the drilling machine, and wherein, when the HOBO device is in the retracted position, the retention arm assembly is disengaged from the deck bushing; anda retention element coupled proximal to a bottom end of the drill string, wherein, when the HOBO device is in the retracted position and the retention arm assembly is disengaged from the deck bushing after the inspection and / or replacement of the work tool from the drill string, the retention element is in engagement with the deck bushing to retain the deck bushing on the drill string.

2. The retention system of claim 1, wherein the retention arm assembly includes:a coupling member that couples the retention arm assembly with the top surface of the HOBO device; andat least one arm integral with the coupling member, wherein when the HOBO device is in the extended position, the at least one arm engages with the deck bushing to retain the deck bushing in the raised state.

3. The retention system of claim 2 further comprising one or more fastening members that removably couple the coupling member of the retention arm assembly with the top surface of the HOBO device.

4. The retention system of claim 2, wherein the deck bushing defines an upper end and a lower end opposite the upper end, wherein the deck bushing includes a flange at the upper end, and a bottom surface defined at the lower end, and wherein, when the HOBO device is in the extended position, the at least one arm engage with the flange of the deck bushing or the bottom surface of the deck bushing.

5. The retention system of claim 1, wherein the retention element defines a maximum diameter that is greater than an inner diameter of the deck bushing.

6. The retention system of claim 1, wherein the retention element defines a plurality of passages to purge out air and / or debris.

7. The retention system of claim 1, wherein the retention element is integral with the drill string or fixedly coupled with the drill string.

8. The retention system of claim 1 further comprising a pipe positioner system that contacts the drill string to guide and center a movement of the drill string along a vertical axis before the retention arm assembly engages with the deck bushing.

9. The retention system of claim 1, wherein the work tool includes a rotary drill bit or a down-the-hole (DTH) drill bit, and wherein a location of the retention element is based on a type of the work tool associated with the drilling machine.

10. A drilling machine comprising:a frame;a mast system supported by the frame;a drill string;a work tool coupled to the drill string;a deck bushing movable relative to the drill string between a raised state and a lowered state; anda retention system for retaining the deck bushing in the raised state to facilitate an inspection and / or a replacement of the work tool from the drill string of the drilling machine, the retention system including:a hydraulically operated breakout (HOBO) device to facilitate the inspection and / or the replacement of the work tool from the drill string of the drilling machine, wherein the HOBO device is movable between a retracted position and an extended position, and wherein the HOBO defines a top surface;a retention arm assembly coupled with the HOBO device proximal to the top surface of the HOBO device, wherein, when the HOBO device is in the extended position, the retention arm assembly is engaged with the deck bushing to retain the deck bushing in the raised state to facilitate the inspection and / or the replacement of the work tool from the drill string of the drilling machine, and wherein, when the HOBO device is in the retracted position, the retention arm assembly is disengaged from the deck bushing; anda retention element coupled proximal to a bottom end of the drill string, wherein, when the HOBO device is in the retracted position and the retention arm assembly is disengaged from the deck bushing after the inspection and / or the replacement of the work tool from the drill string, the retention element is in engagement with the deck bushing to retain the deck bushing on the drill string.

11. The drilling machine of claim 10, wherein the retention arm assembly includes:a coupling member that couples the retention arm assembly with the top surface of the HOBO device; andat least one arm integral with the coupling member, wherein, when the HOBO device is in the extended position, the at least one arm engages with the deck bushing to retain the deck bushing in the raised state.

12. The drilling machine of claim 11, wherein the retention system further includes one or more fastening members that removably couple the coupling member of the retention arm assembly with the top surface of the HOBO device.

13. The drilling machine of claim 11, wherein the deck bushing defines an upper end and a lower end opposite the upper end, wherein the deck bushing includes a flange at the upper end, and a bottom surface defined at the lower end, and wherein, when the HOBO device is in the extended position, the at least one arm engage with the flange of the deck bushing or the bottom surface of the deck bushing.

14. The drilling machine of claim 10, wherein the retention element defines a maximum diameter that is greater than an inner diameter of the deck bushing.

15. The drilling machine of claim 10, wherein the retention element defines a plurality of passages to purge out air and / or debris.

16. The drilling machine of claim 10, wherein the retention element is integral with the drill string or fixedly coupled with the drill string.

17. The drilling machine of claim 10, wherein the retention system further includes a pipe positioner system that contacts the drill string to guide and center a movement of the drill string along a vertical axis before the retention arm assembly engages with the deck bushing.

18. The drilling machine of claim 10, wherein the work tool includes a rotary drill bit or a down-the-hole (DTH) drill bit, and wherein a location of the retention element is based on a type of the work tool associated with the drilling machine.

19. A method for retaining a deck bushing of a drilling machine, the method comprising:engaging a pipe positioner system with a drill string of the drilling machine to guide and center a movement of the drill string along a vertical axis;raising the drill string such that a work tool of the drilling machine is raised above a mast base plate of the drilling machine;moving a hydraulically operated breakout (HOBO) device from a retracted position to an extended position towards the drill string to facilitate an inspection and / or a replacement of the work tool from the drill string of the drilling machine;engaging a retention arm assembly of the drilling machine with the deck bushing based on the movement of the HOBO device from the retracted position to the extended position, wherein the retention arm assembly is coupled with the HOBO device proximal to a top surface of the HOBO device;retaining, by the retention arm assembly, the deck bushing in a raised state based on an engagement of the retention arm assembly with the deck bushing to facilitate the inspection and / or the replacement of the work tool from the drill string of the drilling machine;engaging a retention element of the drilling machine with the deck bushing after the inspection and / or the replacement of the work tool from the drill string of the drilling machine, wherein the retention element is coupled to the drill string proximal to a bottom end of the drill string;retaining, by the retention element, the deck bushing on the drill string based on an engagement of the retention element with the deck bushing;moving the HOBO device from the extended position to the retracted position;reseating the deck bushing on a mast base plate; andlowering the drill string of the drilling machine to a Ready-To-Drill state or a Ready-To-Tram state.

20. The method of claim 19, wherein the deck bushing defines an upper end and a lower end opposite the upper end, wherein the deck bushing includes a flange at the upper end, and a bottom surface defined at the lower end, and wherein the step of engaging the retention arm assembly with the deck bushing further includes engaging at least one arm of the retention arm assembly with the flange of the deck bushing or the bottom surface of the deck bushing.

Images