EP3517725B1 - Outil de forage - Google Patents

Outil de forage Download PDF

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Publication number
EP3517725B1
EP3517725B1 EP16916796.2A EP16916796A EP3517725B1 EP 3517725 B1 EP3517725 B1 EP 3517725B1 EP 16916796 A EP16916796 A EP 16916796A EP 3517725 B1 EP3517725 B1 EP 3517725B1
Authority
EP
European Patent Office
Prior art keywords
main body
pin hole
tool main
fitting
center line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16916796.2A
Other languages
German (de)
English (en)
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EP3517725A1 (fr
EP3517725A4 (fr
Inventor
Kazuyoshi Nakamura
Hiroki Takatsuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mmc Ryotec Corp
Original Assignee
Mmc Ryotec Corp
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Filing date
Publication date
Application filed by Mmc Ryotec Corp filed Critical Mmc Ryotec Corp
Publication of EP3517725A1 publication Critical patent/EP3517725A1/fr
Publication of EP3517725A4 publication Critical patent/EP3517725A4/fr
Application granted granted Critical
Publication of EP3517725B1 publication Critical patent/EP3517725B1/fr
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • E21B10/327—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools the cutter being pivoted about a longitudinal axis
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
    • E21B10/627—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable with plural detachable cutting elements
    • E21B10/633—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable with plural detachable cutting elements independently detachable

Definitions

  • the present disclosure relates to a drilling tool that has a tool main body configured to be rotated around an axis, and an impelling force and a striking force being applied toward a tip side of the drilling tool in a direction of the axis, and a fitting member including a fitting shaft portion to be inserted into a fitting hole portion open at a position eccentric from the axis of a tip portion of the tool main body and to be detachably fitted to the tool main body.
  • a so-called extendable bit or under-reaming bit in which the fitting hole portion is open at the position eccentric from the axis of the tip portion of the tool main body (device) rotated around the axis, the fitting shaft portion is inserted into the fitting hole portion, and a drilling unit having a hard tip is disposed in a tip of the fitting member (bit head) detachably fitted to the tool main body.
  • the extendable bit configured in this way, as the tool main body is rotated, the fitting member is rotated around a center line of the fitting shaft portion, and a radius from the axis of the drilling unit is enlarged and reduced. In an enlarged state of the radius, a large diameter bore hole is provided, and the fitting member can be pulled out and recovered in a state where an inner diameter of a casing pipe inserted into the bore hole is reduced.
  • PTL 1 discloses the following drilling tool.
  • a recessed groove intersecting an extending direction of the fitting shaft portion is provided on an outer peripheral surface of the fitting shaft portion.
  • a pin hole extending in a direction intersecting an extending direction of the fitting hole portion and penetrating the fitting hole portion is provided in the tool main body.
  • a locking pin engaging with the recessed groove of the fitting shaft portion is inserted into the pin hole.
  • the recessed groove is provided in an L shape when viewed in a rotational axis direction of the fitting shaft portion, and the fitting member engages with the locking pin by way of the L-shape provided by the recessed groove so as to be rotatable and retainable.
  • the locking pin is pulled out from the pin hole, thereby enabling the fitting member to be removed from the tool main body.
  • a disk-shaped fixing member made of a rigid body and fixing the locking pin by coming into contact with an end surface of the locking pin, and a locking portion locking and fixing the fixing member in the extending direction of the pin hole are disposed in an opening portion of the pin hole.
  • a disk-shaped auxiliary member made of an elastic body such as synthetic rubber and maintaining a locked state between the fixing member and the locking portion is located in the tool main body.
  • a slide groove for the fixing member to slide thereon is provided in the tool main body so as to extend parallel to the axis of the tool main body when viewed in a center line direction of the pin hole.
  • the pin hole is open, and the locking portion is provided therein.
  • an insertion portion of the fixing member is disposed in the other end of the slide groove. The fixing member inserted from the insertion portion is slid to one end of the slide groove and is locked by the locking portion. Thereafter, the auxiliary member is fitted to the insertion portion and presses the fixing member. In this manner, the fixing member is prevented from being moved, and the locked state is maintained between the fixing member and the locking portion.
  • PTL 2 relates to an excavation tool that comprises: a casing pipe, a large-diameter ring bit disposed coaxially on a distal end side of the casing pipe, and a pilot bit inserted into the ring bit through the inside of the casing pipe.
  • a bit head that expands in diameter when rotated in a tool rotation direction during excavation is provided to an outer circumferential part at the distal end of the pilot bit.
  • PTL 3 provides an excavation tool provided with a widening bit rotatably fitted to the tool body by shaft hole fitting and recyclably made without disposing of the widening bit or the tool body even if abrasion arises in the shaft or the inner/outer peripheral part of the hole to improve the economical efficiency.
  • the slide groove extends parallel to the axis of the tool main body, and the opening portion of the pin hole and the insertion portion of the auxiliary member are aligned with each other in the axial direction when viewed in the center line direction of the pin hole. Accordingly, it is inevitable that a pressing force acts on the auxiliary member when the fixing member tries to slide.
  • the fixing member has the disk shape, and the auxiliary member also has the disk shape. Consequently, the auxiliary member presses the fixing member by coming into point contact with the fixing member.
  • the pressing force received by the auxiliary member when the fixing member tries to move inside the slide groove concentrates on one point oriented in the axial direction of the auxiliary member, thereby causing a possibility that the auxiliary member made of a soft elastic body may be subjected to abrasion from this one point. Then, if this abrasion occurs once in this way and a gap is provided between the fixing member and the auxiliary member, the fixing member vigorously slides in the axial direction in the gap. Consequently, the abrasion is progressively accelerated, and the gap spreads instantaneously. In some cases, the auxiliary member is detached from the insertion portion, and thus, the locked state cannot be maintained between the fixing member and the locking portion.
  • the present disclosure is made in view of the above-described circumstances, and an object thereof is to provide a drilling tool which can prevents abrasion of an auxiliary member by reducing a pressing force generated when a fixing member tries to vigorously slide between a tip side and a posterior end side in an axial direction of a tool main body, and which can perform stable excavation by maintaining a locked state between the fixing member and a locking portion even when long-term excavation tasks are carried out.
  • a drilling tool including a tool main body configured to be rotated around an axis thereof and to receive a striking force acting toward a tip side thereof in a direction of the axis; and a fitting member including a fitting shaft portion to be inserted into a fitting hole portion which is open in a tip portion of the tool main body so as to be detachably fitted to the tool main body.
  • An outer peripheral surface of the fitting shaft portion has a recessed groove provided along a virtual plane orthogonal to a center line of the fitting shaft portion.
  • a pin hole which is partially open on an inner peripheral surface of the fitting hole portion by extending from an outer peripheral surface to an inner peripheral side of the tool main body along the virtual plane of the fitting shaft portion inserted into the fitting hole portion, is formed in the tool main body.
  • a locking pin is inserted into the pin hole so as to be locked by the recessed groove of the fitting shaft portion inserted into the fitting hole portion.
  • a fixing member for retaining the locking pin by coming into contact with the locking pin is fitted to an opening portion of the pin hole on the outer peripheral surface of the tool main body, and a locking portion for locking the fixing member in a center line direction of the pin hole is provided in the opening portion.
  • the outer peripheral surface of the tool main body adjacent to the opening portion of the pin hole has a recess which communicates with the opening portion of the pin hole.
  • the recess has an auxiliary member which has a side surface capable of coming into contact with a side surface facing the recess of the fixing member and which maintains a locked state between the fixing member and the locking portion.
  • a straight line connecting a center of the recess and a center line of the pin hole to each other extends in a direction intersecting the axis.
  • the straight line connecting the center of the recess in which the auxiliary member is located and the center line of the pin hole in which the fixing member is fitted to the opening portion extends in the direction intersecting the axis of the tool main body. Accordingly, a component force acting in the axial direction out of the pressing force acting when the fixing member tries to move due to the striking force applied to the tool main body toward the tip side in the axial direction can be received and stopped by the tool main body having the opening portion. In this manner, it is possible to reduce a pressing force received by the auxiliary member. Therefore, it is possible to prevent abrasion in the auxiliary member which is caused by the pressing force. In this manner, the fixing member can be stably locked by the locking portion over a long period of time by preventing a gap between the fixing member and the auxiliary member from spreading instantaneously due to the abrasion occurring once.
  • the straight line connecting the center of the recess and the center line of the pin hole to each other may extend in the direction obliquely intersecting the axis.
  • the straight line extends in a direction orthogonal to the axis, almost of the all pressing force generated by the striking force can be received and stopped by the tool main body, and it is possible to more reliably prevent the abrasion of the auxiliary member.
  • the pressing force acting in the rotation direction of the fixing member which is generated when the striking force is applied to the tool main body while the tool main body is rotated can be received and stopped by the tool main body. Accordingly, it is possible to further prevent the abrasion of the auxiliary member.
  • the tool main body has the fitting hole portion which is open at a position eccentric from the axis of the tip portion.
  • the fitting member is a bit head in which a drilling unit having a hard tip is disposed in a tip of the fitting shaft portion and is rotated around the center line of the fitting shaft portion so that a radius from the axis of the drilling unit is enlarged and reduced in response to rotation of the tool main body.
  • This configuration is applied to the drilling tool such as the above-described extendable bit. In this manner, it is possible to prevent the abrasion of the auxiliary member due to the impact caused by the striking force on tip side in the axial direction. Therefore, it is more preferable to adopt this configuration.
  • FIGS. 1 to 10 illustrate an embodiment according to the present disclosure.
  • the embodiment shows a case when the present disclosure is applied to an extendable bit as described above.
  • a tool main body 1 is a device of this extendable bit, which is provided of a steel material in a columnar shape having an outer shape of substantially multi-stages whose axis O serves as a center.
  • a posterior end portion thereof (right side portion in FIG. 1 ) is a shank portion 1A having the smallest diameter.
  • a striking force is applied to a tip side of the tool main body 1 in a direction of the axis O by a down-the-hole hammer H connected to the above-described shank portion 1A.
  • a rotating force acting around the axis O and an impelling force acting on the tip side in the direction of the axis O are applied in a tool rotation direction T from an excavation device (not illustrated) connected via a drill rod (not illustrated) to the down-the-hole hammer H, thereby excavating the ground (bedrock) so as to form a bore hole.
  • a step portion 1B having the largest diameter is provided, and the tool main body 1 is provided in a cylindrical shape having a constant outer diameter on the further tip side from the step portion 1B.
  • a casing pipe P having a slightly larger inner diameter than that of the step portion 1B is located on an outer periphery of the tool main body 1.
  • a casing top Q having a slightly larger inner diameter than an outer diameter of the tool main body 1 on the further tip side from the step portion 1B is fitted to a tip of the casing pipe P.
  • the step portion 1B comes into contact with a posterior end of the casing top Q, thereby applying the impelling force and the striking force to the tip side in the direction of the axis O. In this manner, the casing pipe P is inserted into the bore hole provided by the drilling tool.
  • the tip portion of the tool main body 1 has a recessed portion 2 which is open on a tip surface and an outer peripheral surface of the tool main body 1 so as to be located on the further tip side from the casing top Q, in a state where the step portion 1B is in contact with the posterior end of the casing top Q as described above.
  • the recessed portion 2 has a bottom surface 2A facing the tip side of the tool main body 1 and perpendicular to the axis O, a flat wall surface 2B extending parallel to the axis O from the bottom surface 2A to the tip surface of the tool main body 1 and oriented in a tool rotation direction T, and a flat wall surface 2C facing an outer peripheral side of the tool main body 1.
  • a corner portion 2D where the wall surfaces 2B and 2C intersect each other is provided in a recessed cylindrical shape having a center line parallel to the axis O.
  • three recessed portions 2 are provided at an equal distance in a circumferential direction.
  • a fitting hole portion 3 is provided from the bottom surface 2A to the posterior end side of the recessed portions 2.
  • the fitting hole portion 3 is provided in a circular cross-sectional shape having a constant inner diameter, in which the center is set as a hole portion center line L1 parallel to the axis O and eccentric from the axis O to the outer peripheral side.
  • the hole portion center line L1 is located coaxially with the center line of the recessed cylindrical surface provided by the corner portion 2D of the recessed portion 2, and the inner diameter (diameter) of the fitting hole portion 3 is slightly smaller than the diameter of the recessed cylindrical surface provided by the corner portion 2D.
  • the fitting member 5 detachably fitted to the tool main body 1 by inserting a fitting shaft portion 4 into the fitting hole portion 3 in this way is a bit head of the extendable bit
  • the present embodiment adopts a configuration in which a drilling unit 6 is integrally provided in the tip of the fitting shaft portion 4.
  • the tip surface of the drilling unit 6 and the tip surface the recessed portions 2 of the tool main body 1 have multiple embedded hard tips 7 made of a cemented carbide alloy which is harder than the tool main body 1 or the fitting member 5 made of steel. The ground is crushed by the hard tips 7 so as to perform excavation.
  • the fitting shaft portion 4 is provided in a cylindrical shaft shape having a shaft portion center line L2 as the center, and its outer diameter is provided so as to be slightly smaller than the inner diameter of the fitting hole portion 3, and is provided so that a length thereof is approximately equal to a depth of the fitting hole portion 3. Therefore, the fitting shaft portion 4 is slidably fitted into the fitting hole portion 3, and is inserted such that the shaft portion center line L2 is coaxial with the hole portion center line L1.
  • the posterior end surface of the drilling unit 6 comes into contact with a bottom surface 2A of the recessed portion 2. In this way, in an inserted state where the fitting shaft portion 4 is inserted into the fitting hole portion 3, the fitting member 5 is rotatable around the hole portion center line L1.
  • the drilling unit 6 when viewed from the tip, includes two flat side surfaces which are substantially parallel to each other as illustrated in FIGS. 2 and 3 or which are closer to each other as both of these face the fitting shaft portion 4 side at an angle smaller than an angle formed between the wall surfaces 2B and 2C of the recessed portion 2, and two side surfaces having a protruded cylindrical surface extending on the fitting shaft portion 4 side and the side opposite to the fitting shaft portion 4 between both the flat side surfaces.
  • the side surfaces are provided so as to be parallel to the shaft portion center line L2, that is, so as to be parallel to the axis O of the hole portion center line L1 and the tool main body 1 in the above-described inserted state.
  • the side surface having the protruded cylindrical surface on the fitting shaft portion 4 side is a cylindrical surface having the shaft portion center line L2 as the center.
  • a radius of the cylindrical surface is slightly smaller than a radius of the recessed cylindrical surface provided by the corner portion 2D of the recessed portion 2, and the cylindrical surface can come into sliding contact with the corner portion 2D in the above-described inserted state.
  • the fitting member 5 is rotated around the hole portion center line L1 to the side opposite to the tool rotation direction T, and the radius from the axis O is enlarged. As illustrated in FIG. 2 , the fitting member 5 is positioned at a location where the flat side surface of the drilling unit 6 facing the side opposite to the tool rotation direction T comes into contact with the wall surface 2B facing the tool rotation direction T of the recessed portion 2.
  • the side surface having the protruded cylindrical surface on the side opposite to the fitting shaft portion 4 of the drilling unit 6 is located on the cylindrical surface having the larger outer diameter than that of the casing pipe P having the axis O of the tool main body 1 as the center.
  • the bore hole into which the casing pipe P can be inserted is provided by the hard tip 7 located on the tip side.
  • the fitting member 5 is rotated around the hole portion center line L1 in the tool rotation direction T, and the radius from the axis O is reduced. As illustrated in FIG. 3 , the fitting member 5 is positioned at a location where the flat side surface of the drilling unit 6 facing the inner peripheral side of the tool main body 1 comes into contact with the wall surface 2C facing the outer peripheral side of the recessed portion 2 in the tool main body 1.
  • the drilling unit 6 is accommodated inside the cylindrical surface having an outer diameter equal to an outer diameter of a cylinder provided by a portion on the further tip side from the step portion 1B of the tool main body 1.
  • the tool main body 1 and the fitting member 5 as well are moved rearward to the posterior end side in the direction of the axis O, and can be pulled out from the inside of the casing pipe P.
  • the outer peripheral surface of the fitting shaft portion 4 of the fitting member 5 has a recessed groove 4A along a virtual plane orthogonal to the shaft portion center line L2, that is, a virtual plane A orthogonal to the hole portion center line L1 in the above-described inserted state.
  • the recessed groove 4A is provided on a side surface side having a protruded cylindrical surface on the fitting shaft portion 4 side of the drilling unit 6 when viewed in a direction of the shaft portion center line L2.
  • a cross section along the virtual plane A is provided in an L-shape.
  • this portion bent in the L-shape is provided in a protruded arc shape whose center is the shaft portion center line L2 which comes into contact with a linearly extending portion on both sides thereof.
  • the recessed groove 4A is provided in a semicircular oval shape extending in the direction of the shaft portion center line L2 as illustrated in FIG. 1 .
  • a pin hole 8 which is provided along the virtual plane A orthogonal to the hole portion center line L1 in the same inserted state, is formed in the tool body 1.
  • the pin hole 8 is circular in cross section according to the present embodiment, and each pin hole 8 has a pin hole center line C extending so as to substantially come into contact with the inner peripheral surface of the three fitting hole portions 3 provided at an equal distance in the circumferential direction, from the side opposite to the tool rotation direction T.
  • the pin hole 8 is provided in a blind hole shape facing the inner peripheral side, which is open on the outer peripheral surface of the tool main body 1. Therefore, the pin holes 8 is partially open to the inner peripheral surface of the fitting hole portion 3 at a portion where the pin hole center line C substantially comes into contact with the inner peripheral surface of the fitting hole portion 3.
  • a radius of the pin hole 8 is substantially equal to a depth from the outer peripheral surface of the fitting shaft portion 4 to the groove bottom of the recessed groove 4A and the depth of a groove bottom of the recessed groove 4A in a portion in contact with the inner peripheral surface of the two fitting hole portions 3.
  • An opening portion of the pin hole 8 to the outer peripheral surface of the tool main body 1 is open on the outer peripheral surface of the tool main body 1 while the radius is maintained without any change except for a locking portion to (be described later).
  • a locking pin 9 having a cylindrical shaft shape whose outer diameter is slightly smaller than the inner diameter of the pin hole 8 is inserted into the pin hole 8, and one end surface of the locking pin 9 which faces the inner peripheral side of the tool main body 1 is brought into contact with a bottom surface of the pin hole 8. In this manner, the locking pin 9 is locked by the recessed groove 4A of the fitting shaft portion 4 of the fitting member 5 inserted into the fitting hole portion 3.
  • a fixing member 10 which comes into contact with the other end surface of the locking pin 9 and locks the locking pin 9 at the opening portion of the pin hole 8 in the pin hole center line C is fitted to the opening portion of the pin hole 8, and a locking portion 11 for locking the fixing member 10 itself in the center line C direction of the pin hole 8 is provided in the opening portion of the pin hole 8.
  • a recess 12 communicating with the opening portion of the pin hole 8 is provided on the outer peripheral surface of the tool main body 1 adjacent to the opening portion of the pin hole 8.
  • the recess 12 has an auxiliary member 13 for maintaining a locked state between the fixing member 10 and the locking portion 11.
  • the recess 12 is provided so as to communicate with the opening portion of the pin hole 8 as illustrated in FIGS. 4 and 5 , and includes an extension portion 12A extending with a width equal to a diameter of a circle provided by the opening portion, and a circular portion 12B which has a center line parallel to the pin hole center line C on a side of the extension portion 12A opposite to the pin hole 8 and which has a larger diameter than the pin hole 8.
  • a distance between a center D and the pin hole center line C of the circular portion 12B is set to be slightly larger than the sum of the radius of the circular portion 12B and the radius of the pin hole 8.
  • Grooves are provided in the pin hole 8 and the inner peripheral portion of the recess 12 at a slight distance from the outer peripheral surface of the tool main body 1.
  • the groove provided in the inner peripheral portion of the pin hole 8 serves as the locking portion 11 according to the present embodiment.
  • the groove provided in the inner periphery of the circular portion 12B in the recess 12 serves as a recess side locking portion 12C according to the present embodiment
  • the groove provided in the extension portion 12A serves as a slide groove 12D according to the present embodiment.
  • the locking portion 11, the recess side locking portion 12C, and the slide groove 12D are provided along one virtual plane orthogonal to the pin hole center line C. That is, two groove wall surfaces facing each other in the direction of the pin hole center line C are respectively provided to be flush among the locking portion 11, the recess side locking portion 12C, and the slide groove 12D.
  • the two groove wall surfaces are provided to be perpendicular to the pin hole center line C, and a groove bottom surface facing inward of the pin hole 8 and the recess 12 between the groove wall surfaces is provided to be perpendicular to the groove wall surface, that is, to be parallel to the pin hole center line C.
  • the locking portion 11, the recess side locking portion 12C, and the slide groove 12D are provided so that a cross section along the pin hole center line C has a rectangular shape.
  • a groove depth of the groove provided by the locking portion 11, the recess side locking portion 12C, and the slide groove 12D is provided so that the locking portion 11 and the slide groove 12D have a constant and mutually equal depth.
  • the recess side locking portion 12C is provided so as to have a constant groove depth which is shallow than a groove depth of the locking portion 11 and the slide groove 12D.
  • the fixing member 10 locked by the locking portion 11 is provided in a disk shape as illustrated in FIGS. 6 and 7 by using a rigid body such as a steel material, similarly to the tool main body 1.
  • a flange portion 10A is provided on the bottom surface (lower surface in FIG. 7 ) side of the side surface.
  • the thickness from the bottom surface of the fixing member 10 is slightly smaller than a groove width between the two groove wall surfaces of the groove provided by the locking portion 11 and the slide groove 12D.
  • the flange portion 10A is provided in a rectangular cross-sectional shape having a constant protrusion amount equal to the groove depth of the locking portion 11 and the slide groove 12D from the side surface, and is provided on the entire periphery of the disk provided by the fixing member 10.
  • the fixing member 10 is provided so that the radius is slightly smaller than the radius of the pin hole 8.
  • the fixing member 10 provided in this way can be inserted into the recess 12 by causing the bottom surface to face the inner peripheral side of the tool main body 1 as will be described later in FIG. 10(b) .
  • the flange portion 10A coincides with the locking portion 11 and the slide groove 12D in the direction of the pin hole center line C
  • the flange portion 10A is slid to the opening portion side of the pin hole 8 along the slide groove 12D.
  • the flange portion 10A can be fitted to the opening portion of the pin hole 8 by locking the flange portion 10A to the locking portion 11 and the slide groove 12D in the direction of the pin hole center line C.
  • the auxiliary member 13 located in the recess 12 is also provided in a disk shape as illustrated in FIGS. 8 and 9 by using an elastic body such as urethane rubber and synthetic rubber according to the present embodiment.
  • a flange portion 13A having a slightly larger diameter than the upper surface (upper surface in FIG. 9 ) side is also provided on the bottom surface (lower surface in FIG. 9 ) side of the auxiliary member 13.
  • the diameter of the flange portion 13A is provided to be approximately equal to the inner diameter of the recess side locking portion 12C on the upper surface side and to gradually decrease toward the bottom surface side.
  • the diameter of the side surface of the auxiliary member 13 on the further upper surface side from the flange portion 13A is approximately equal to the inner diameter of the circular portion 12B of the recess 12.
  • a straight line E connecting the center D of the recess 12 to which the auxiliary member 13 is fitted and the pin hole center line C extends in the direction intersecting the axis O of the tool main body 1 when viewed in the direction of the pin hole center line C as illustrated in FIG. 5 . That is, the extension portion 12A of the recess 12 extends in the direction intersecting the axis O from the opening portion of the pin hole 8, and reaches the circular portion 12B. In particular, according to the present embodiment, the extension portion 12A extends in the direction orthogonal to the axis O. In addition, the recess 12 extends to a side opposite to the tool rotation direction T from the opening portion of the pin hole 8 in a circumferential direction of the tool main body 1.
  • distance in the direction of the straight line E between the pin hole center line C and the center D of the recess 12 is equal to the sum of the radius of the flange portion 10A of the fixing member 10 and the radius on the upper surface side of the flange portion 13A of the auxiliary member 13.
  • the flange portion 13A of the auxiliary member 13 can be brought into contact with the side surface of the flange portion 10A facing the recess 12 of the fixing member 10, thereby maintaining a locked state between the fixing member 10 and the locking portion 11.
  • three discharge grooves 14 for discharging excavation chips generated during the excavation are provided to be open on the side in the tool rotation direction T of the fitting hole portion 3 on the bottom surface 2A of the respective three recessed portions 2.
  • the bottom surface 2A in the opening portion has a step so as to slightly move rearward to the posterior end side in the direction of the axis O on the outer peripheral side as illustrated in FIG. 1 .
  • a supply hole 15 for supplying a fluid such as compressed air fed from the above-described excavation device side extends along the axis O as illustrated in FIG. 1 .
  • the supply hole 15 is branched in the tip portion of the tool main body 1, and is open to the rearward moved portion of the bottom surface 2A of the recessed portion 2, the wall surface 2C, and the outer peripheral surface of the tool main body 1.
  • the fitting member 5 serving as the bit head of the fitting shaft portion 4 is inserted into the fitting hole portion 3 of the tool main body 1 serving as the device.
  • the drilling unit 6 is accommodated in the recessed portion 2.
  • the locking pin 9 is inserted into the pin hole 8 as illustrated in FIG. 10(a) , and is locked by the recessed groove 4A of the fitting shaft portion 4, thereby retaining the fitting member 5.
  • FIG. 10(b) after the fixing member 10 inserted into the recess 12 is slid and locked by the locking portion 11 of the opening portion of the pin hole 8. Thereafter, as illustrated in FIG.
  • the auxiliary member 13 which is an elastic body is pushed into the recess 12 while the auxiliary member 13 is elastically deformed. In this manner, when the flange portion 13A enters the recess side locking portion 12C, the flange portion 13A spreads and closely adheres to the flange portion 10A of the fixing member 10, thereby retaining the fixing member 10.
  • the drilling tool configured in this way is inserted into the casing pipe P in a state where the drilling unit 6 of the fitting member 5 is reduced in diameter.
  • the rotating force acting around the axis O is applied to the drilling unit 6 as described above so as to be enlarged in diameter.
  • the impelling force and the striking force are applied to the tip side in the direction of the axis O. In this manner, the bore hole is provided, and the casing pipe P is inserted into the bore hole.
  • the drilling unit is reduced in diameter by rotating the tool main body 1 to the side opposite to the tool rotation direction T as described above, and the drilling unit can be pulled out and collected from the casing pipe P.
  • the straight line E connecting the center D of the recess 12 where the auxiliary member 13 is located and the pin hole center line C to each other extends in the direction intersecting the axis O of the tool main body 1.
  • the component force acting the direction of the axis O can be received and stopped by the tool main body 1 itself having the opening portion of the pin hole 8.
  • the pressing force received by the auxiliary member 13 can be reduced, and the abrasion of the soft auxiliary member 13 made of an elastic body can be prevented.
  • An open gap between the fixing member 10 and the auxiliary member 13 can be prevented from spreading instantaneously due to the abrasion occurring.
  • the locked state between the fixing member 10 and the locking portion 11 can be reliably maintained, and it is possible to prevent slippage of the auxiliary member 13 or subsequent falling of the fixing member 10 and the locking pin 9. Therefore, the fixing member 10 can be stably locked by the locking portion 11 of the opening portion the pin hole 8 over a long period, and the excavation can be smoothly performed.
  • the straight line E connecting the center D of the recess 12 and the pin hole center line C to each other extends in the direction orthogonal to the axis O of the tool main body 1. Accordingly, substantially all of the pressing force generated by the striking force applied to the tool main body 1 can be received and stopped by the tool main body 1, and the abrasion of the auxiliary member 13 can be more reliably prevented.
  • the straight line E is orthogonal to the axis O, a space in the direction of the axis O which is required for the tool main body 1 to form the recess 12 is sufficiently settled only using a size of the recess 12 itself. Therefore, it is possible to minimize the length of the tool main body 1 in the direction of the axis O, and it is possible to reduce the manufacturing cost of the tool main body 1.
  • the straight line E when viewed in the direction of the pin hole center line C in this way, the straight line E extends in the direction orthogonal to the axis O.
  • the straight line E may extend in a direction obliquely intersecting the axis O.
  • the inclination angle formed between the straight line E and the direction orthogonal to the axis O falls within 60% or smaller toward the tip side or the posterior end side in the direction of the axis O from the opening portion of the pin hole 8, even in a case where the recess 12 extends to the side of the opposite to the tool rotation direction T from the opening portion of the pin hole 8 as in the above-described embodiment, or even in a case where the recess 12 extends in the tool rotation direction T. That is, it is desirable that the inclination angle with respect to the axis O of the straight line E falls within 30° or greater and 150° or less.
  • the recess 12 extends from the opening portion of the pin hole 8 to the side opposite to the tool rotation direction T. Therefore, the pressing force acting in the tool rotation direction T of the fixing member 10 which is caused by the impact when the tool main body 1 receives the striking force on the tip side in the direction of the axis O while being rotated around the axis O can also be received and stopped by the opening portion of the pin hole 8 provided in the tool main body 1. Therefore, it is possible to prevent the abrasion of the auxiliary member 13 which is caused by the pressing force acting in the tool rotation direction T.
  • the drilling tool is the device in which the impact occurs in this way due to the striking force applied to the tool main body 1 during the excavation and the tool main body 1 is rotated around the axis O.
  • the fitting hole portion 3 is open at the position eccentric from the axis O of the tip portion
  • the pin hole 8 is open on the outer peripheral surface of the tool main body 1
  • the fitting member 5 is the bit head in which the drilling unit 6 having the hard tip 7 is disposed in the tip of the fitting shaft portion 4.
  • the drilling tool is the extendable bit rotated around the shaft portion center line L2 so that the radius from the axis O of the drilling unit 6 is enlarged and reduced in response to the rotation of the tool main body 1.
  • the drilling tool of the present disclosure it is possible to prevent abrasion of an auxiliary member even when long-term excavation tasks are carried out, and it is possible to maintain a locked state between a fixing member and a locking portion. Therefore, stable excavation can be performed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)

Claims (4)

  1. Outil de forage comprenant :
    un corps principal d'outil (1) configuré pour être mis en rotation autour d'un axe (O) de celui-ci et pour recevoir une force de frappe agissant vers un côté de pointe de celui-ci dans une direction de l'axe ; et
    un élément d'ajustement (5) incluant une partie d'arbre d'ajustement (4) à insérer dans une partie de trou d'ajustement (3) qui est ouverte dans une partie de pointe du corps principal d'outil (1) pour pouvoir se détacher de manière amovible sur le corps principal d'outil (1),
    dans lequel une surface périphérique extérieure de la partie d'arbre d'ajustement (4) présente une rainure évidée (4A) prévue le long d'un plan virtuel (A) orthogonal à une ligne centrale de la partie d'arbre d'ajustement (4),
    un trou de goupille (8), qui est ouvert partiellement sur une surface périphérique intérieure de la partie de trou d'ajustement (3) en s'étendant d'une surface périphérique extérieure vers un côté périphérique intérieur du corps principal d'outil (1) le long du plan virtuel (A) de la partie d'arbre d'ajustement (4) insérée dans la partie de trou d'ajustement (3), est formé dans le corps principal d'outil (1),
    une goupille de verrouillage (9) est insérée dans le trou de goupille (8) de manière à être verrouillée par la rainure évidée (4A) de la partie d'arbre d'ajustement (4) insérée dans la partie de trou d'ajustement (3),
    un élément de fixation (10) pour retenir la goupille de verrouillage (9) en venant en contact avec la goupille de verrouillage (9) est ajusté à une partie d'ouverture du trou de goupille (8) sur la surface périphérique extérieure du corps principal d'outil (1), et une partie de verrouillage (11) pour verrouiller l'élément de fixation (10) dans une direction de ligne centrale du trou de goupille (8) est prévue dans la partie d'ouverture,
    la surface périphérique extérieure du corps principal d'outil (1) adjacente à la partie d'ouverture du trou de goupille (8) présente un évidement (12) qui communique avec la partie d'ouverture du trou de goupille (8),
    l'évidement (12) présente un élément auxiliaire (13) qui présente une surface latérale capable de venir en contact avec une surface latérale faisant face à l'évidement de l'élément de fixation (10) et qui maintient un état verrouillé entre l'élément de fixation (10) et la partie de verrouillage (11), caractérisé en ce que
    en regardant dans la direction de ligne centrale du trou de goupille (8), une ligne droite (E) reliant un centre (D) de l'évidement (12) et une ligne centrale (C) du trou de goupille (8) s'étend dans une direction coupant l'axe (O).
  2. Outil de forage selon la revendication 1,
    dans lequel, en regardant dans la direction de ligne centrale du trou de goupille (8), la ligne droite (E) reliant le centre (D) de l'évidement (12) et la ligne centrale (C) du trou de goupille (8) l'un à l'autre s'étend dans une direction orthogonale à l'axe (O).
  3. Outil de forage selon la revendication 1 ou 2,
    dans lequel l'évidement (12) s'étend depuis la partie d'ouverture du trou de goupille (8) vers un côté opposé à une direction de rotation (T) du corps principal d'outil (1).
  4. Outil de forage selon l'une quelconque des revendications 1 à 3,
    dans lequel le corps principal d'outil (1) présente la partie de trou d'ajustement (3) qui est ouverte au niveau d'une position excentrée par rapport à l'axe (O) de la partie de pointe, et
    dans lequel l'élément d'ajustement (5) est une tête de foret dans laquelle une unité de forage (6) présentant une pointe dure (7) est disposée dans une pointe de la partie d'arbre d'ajustement (4), et est mise en rotation autour de la ligne centrale de la partie d'arbre d'ajustement (4) de sorte qu'un rayon à partir de l'axe (O) de l'unité de forage (6) est agrandi et réduit en réponse à une rotation du corps principal d'outil (1).
EP16916796.2A 2016-09-23 2016-09-23 Outil de forage Active EP3517725B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/078016 WO2018055728A1 (fr) 2016-09-23 2016-09-23 Outil d'excavation

Publications (3)

Publication Number Publication Date
EP3517725A1 EP3517725A1 (fr) 2019-07-31
EP3517725A4 EP3517725A4 (fr) 2020-05-13
EP3517725B1 true EP3517725B1 (fr) 2021-07-28

Family

ID=61690373

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16916796.2A Active EP3517725B1 (fr) 2016-09-23 2016-09-23 Outil de forage

Country Status (2)

Country Link
EP (1) EP3517725B1 (fr)
WO (1) WO2018055728A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4122893B2 (ja) * 2002-08-15 2008-07-23 三菱マテリアル株式会社 掘削工具
JP4957440B2 (ja) 2007-08-06 2012-06-20 三菱マテリアル株式会社 掘削工具
JP6330573B2 (ja) * 2014-08-20 2018-05-30 三菱マテリアル株式会社 掘削工具

Also Published As

Publication number Publication date
EP3517725A1 (fr) 2019-07-31
EP3517725A4 (fr) 2020-05-13
WO2018055728A1 (fr) 2018-03-29

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