JP2013091895A - Drilling tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exchange only a worn cutter bit when a cutter bit is worn, and to allow a cutter bit to be immune to a large load during use.SOLUTION: A drilling tool comprises a holder 5 which is fixed to a rotary drum 2 which is rotated forcibly and a removable cutter bit 7 which is mounted to the holder 5, and the cutter bit 7 and the holder 5 are bolted. A forked recess of a fitting groove is formed in a terminal portion of the bit 7, and a plate-shaped portion which is engaged with the forked recess of the cutter bit 7 is provided in the holder 5. In the cutter bit 7, a jaw 8 comprised of a lock step is formed in a main body part ahead of the forked recess so as to protrude backward during drilling, and a corner part 8a of the jaw 8 is engaged to a terminal of the holder 5.

Description

  The present invention relates to an excavation tool or other excavation tool for use in a landmine treatment apparatus for treating an antipersonnel landmine or the like by destroying it without exploding or exploding by a high speed rotation of a rotary cutter.

  The inventor previously planted a cutter bit on the peripheral surface of the rotating drum in place of the bucket at the tip of the undulating and bendable arm of the heavy-duty vehicle 1 used in an excavator such as a backhoe, and has a depth of about 30 cm or more. Invented a landmine disposal device equipped with a rotary cutter that can be cut to the opposite direction and can be discharged on the opposite side of the traveling direction, and obtained numerous patents, for example, 3016018, 30309847, and 3177737 Yes.

  According to these landmine disposal devices, a rotary cutter is installed at the tip of the arm, turning while rotating the cutter, operating the boom arm, cutting and crushing bushes, grass, etc. growing in the wasteland, and at the same time, Anti-personnel mines buried under the surface can be crushed at once.

  A rotary cutter in such a landmine disposal device is provided with a plurality of bit mounting portions on the outer periphery of a cylindrical base body provided with a rotation mechanism at both ends in the axial direction, and a plurality of bits are welded to each row. The excavator is attached by a fixing method.

The following patent document shows that such a drilling device is extremely uneconomical because it is difficult to replace the bit when the bit fixed to the cylindrical base is worn, and the entire device becomes unusable. Even if the bit is worn, it is only necessary to replace the worn bit.
Japanese Patent No. 3318603

  According to Patent Document 1, the excavator 1 is provided at the tip of an arm 41 that can be undulated and bent in a heavy machinery vehicle used in a heavy machinery vehicle (base machine) 40 used in a shovel such as a backhoe as shown in FIG. A rotary cutter is detachably attached as an attachment and is forcibly rotated in a predetermined direction by a rotating device using a hydraulic motor as a driving source. The rotary cutter as the excavating device 1 is a cylinder of the rotary excavating device as shown in FIG. The holder 5 is fixed to the rotating drum 2 and the cutter bits 7 are individually attached to the holder.

  As shown in FIG. 12, the holder 5 has a base portion having an arcuate bottom surface fixed to the arcuate curved surface of the rotary drum 2 by screwing or welding. The upper portion of the holder 5 has a substantially triangular shape in side view, and thick support portions 12 and 13 are provided on the front side and the rear side in the rotational direction, respectively, and the middle portion between them is a thin plate-like portion 15. ing. The height of the front side indicator 12 is considerably lower than the height of the rear side indicator 13, and the upper surface of the front side indicator 12 is formed as an inclined surface 12a with a lower front side, and a plate shape continuous therewith. The upper surface 15a of the part 15 is also formed as an inclined surface with a low front side. A hardened layer 17 is formed on both the left and right edges of the front side indicator 12.

  A through hole 19 penetrating left and right is provided at a position near the lower portion of the plate-like portion 15 of the holder 5. The through hole 19 is a bolt hole for fixing the bit. Further, support surfaces 12b and 13b that are perpendicular to the plate-like portion are provided on the back surface of the front-side instruction portion 12 and the front surface of the support portion on the rear side, respectively.

  The cutter bit 7 is formed by brazing a cemented carbide blade body 23 to a front upper end portion of a steel shank portion 21, and a fitting groove 25 is cut upward from the bottom surface of the base portion of the shank portion 21. It is included. Both side portions of the fitting groove 25 are leg portions 21a and 21b and are bifurcated. The fitting groove 25 is shallow on the front side and deeply cut on the rear side, and has a shape corresponding to the plate-like portion 15 of the holder in a side view.

  Further, the base part of the shank part 21 is provided with a bolt mounting hole 27 penetrating the leg parts 21a, 21b. A portion of the hole 27 formed on the side of the one leg portion 21a across the fitting groove is a dish-like portion 27a in which the head portion 30a of the bolt 30 is embedded, and the screw is not cut. . Moreover, the hole provided in the leg 21b on the opposite side across the fitting groove 25 is a screw hole 27b into which the bolt 30 is screwed.

  Cutter bits 7,... Are attached to holders 5,. In this attachment, the plate-like portion 15 of the holder is fitted into the fitting groove 25 of the bit, and the bolt 30 as a fixing means is inserted through the both leg portions 21a, 21b and the plate-like portion 15 and screwed. Done. This bit is easy to attach and detach.

  Most of the load received by the cutter bit 7 during excavation is supported by the inclined surface (the upper surface 15a of the plate-like portion 15) at the engaging portion between the cutter bit 7 and the holder.

  When the wear of the cutter bit 7 has progressed and it can no longer be used, the bit is removed and replaced with a new bit. Since the bit itself is a consumable item and its price is relatively low, economical excavation work can be performed by sequentially replacing and reusing the worn bit.

  The rotary cutter as the excavator 1 is a hydraulic motor direct connection type, and a drive motor is coupled to the rotating shaft of the rotary drum 2 on the left and right. As an example, the outer diameter of the excavation is φ900 mm to φ800 mm, the rotation speed is 500 to 650 rpm, the torque MAX is 128 kg. m, cutting speed (tip) MAX 85 km / h to MAX 110 km / h, blade tip excavating force 284 kg to 319 kg, rated pressure 280 kg / cm 2, rated flow 165 to 210 liters / min, rated output 107 kW, cutter 1400 kg to 2000 kg, at least deep Therefore, the excavation load applied to the cutter bit is considerably large, and the fitting between the plate-like portion 15 of the holder and the fitting groove 25 of the bit as described above is performed. Can not protect the cutter bit enough. There is a risk of damage.

  The object of the present invention is to eliminate the inconvenience of the conventional example, and when the cutter bit is worn, it is possible to replace only the worn cutter bit, and the cutter bit can sufficiently withstand a large load during use. An object of the present invention is to provide a drilling tool devised so that it can be performed.

  In order to achieve the above object, the present invention according to claim 1 is a holder fixed to a rotating drum forcibly rotating, a detachable cutter bit attached to the holder, and bolting the cutter bit and the holder. In the excavation tool, a bifurcated recess of a fitting groove is formed at an end of the bit, and the holder is provided with a plate-like portion that engages with the bifurcated recess of a cutter bit. The main feature of the cutter bit is that the jaw part by the locking step part protrudes from the bifurcated concave part to the rear side during excavation, and the corner part by this jaw part is engaged with the holder end. is there.

  According to the first aspect of the present invention, the holder is fixed to the rotary drum of the excavator by welding or the like, and the bit is attached to the holder. The bit is attached by engaging the engaging portion of the bit and the engaging portion of the holder, and inserting a fixture through the engaging portion. Most of the load that the bit receives during excavation is supported by the engagement between the bit and the holder. This engagement, in addition to the engagement between the plate-shaped part of the holder and the fitting groove of the bit, The jaw part by the locking step part is formed on the previous body part so as to protrude rearward at the time of excavation, and this jaw part is engaged with the holder end, so the place where the most force is applied is firmly held, making it impossible for the bit itself Power does not work.

  As described above, the excavation tool according to the present invention makes it possible to replace only the worn bit when the bit is worn and to sufficiently withstand a large load during use. .

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 9 is a side view of a heavy machine vehicle (base machine) 40 to which the excavation apparatus 1 using the excavation tool of the present invention is attached as an mine disposal attachment. The heavy machine vehicle 40 is provided with an undulating and bendable arm 41. ing. Although 40a is a driver's seat (cabin) and 40b is a crawler belt for traveling, it may be of a wheel type having wheels instead of the crawler belt.

  The undulating and bendable arm 41 is composed of a boom 41a, an arm 41b, a boom cylinder 41c, an arm cylinder 41d, and a bucket cylinder 41e, and the tip of the link mechanism 43a is attached to the tip of the excavator 1 (rotary cutter) as an attachment with a pin 44. ) Can be removed. 3 and 4 show the excavator 1 (rotary cutter) as the touchment.

  In the excavator 1 (rotary cutter), a cutter holder 5 is provided on the peripheral surface of the rotary drum 2, and cutter bits 7 made of carbon steel are planted at appropriate intervals through the cutter holder 5. As shown, the drive motor is coupled to the rotating shaft of the rotating drum.

  On the side of the excavator 1 (rotary cutter), a movable comb blade 46b that is movable by a cylinder or the like with respect to the fixed comb blade 46a is provided, and a rake grapple 46 that can be sandwiched is provided on the opposite side. An electric type magnet 45 is provided to supply power to the heavy machinery vehicle with an operation switch.

  The mine excavation tool of the present invention, like the conventional example, includes holders 5 fixed to the cylindrical rotary drum 2 of the rotary excavator and cutter bits 7 attached individually to the holder. Become.

  As shown in FIGS. 1 and 2, the holder 5 has a base portion having an arc-shaped bottom surface fixed to the arc-shaped curved surface of the rotating drum 2 by screwing or welding. The upper portion of the holder 5 has a substantially triangular shape in side view, and thick support portions 12 and 13 are provided on the front side and the rear side in the rotational direction, respectively, and the middle portion between them is a thin plate-like portion 15. ing.

  The height of the front side indicator 12 is considerably lower than the height of the rear side indicator 13, and the upper surface 15 a of the plate-like portion 15 that is continuous therewith is formed as an inclined surface with a low front side.

  A through hole 19 penetrating left and right is provided at a position near the lower portion of the plate-like portion 15 of the holder 5. The through hole 19 is a bolt hole for fixing the bit.

  The cutter bit 7 is formed by brazing a cemented carbide blade body 23 to a front upper end portion of a steel shank portion 21, and a fitting groove 25 is formed upward from the bottom surface of the end portion of the shank portion 21. It is cut. Both side portions of the fitting groove 25 are leg portions 21a and 21b and are bifurcated concave portions. The fitting groove 25 is shallow on the front side and deeply cut on the rear side, and has a shape corresponding to the plate-like portion 15 of the holder in a side view.

  Further, at the end of the shank portion 21, a bolt mounting hole 27 that penetrates the leg portions 21a and 21b is provided. A portion of the hole 27 formed on the side of the one leg portion 21a across the fitting groove is a dish-like portion 27a in which the head portion 30a of the bolt 30 is embedded, and the screw is not cut. . Moreover, the hole provided in the leg 21b on the opposite side across the fitting groove 25 is a screw hole 27b into which the bolt 30 is screwed.

  In the present invention, a hook-like jaw portion 8 by a locking step portion is formed to protrude from the bifurcated recess portion of the cutter bit 7 to the rear side at the time of excavation, and a corner portion 8 a by the jaw portion 8 is formed on the holder 5. It was made to engage with the front end 13 a of the rear side instruction unit 13.

  In this way, the cutter bits 7 are attached to the holders 5 fixed to the rotary drum 2 in an appropriate arrangement. In this attachment, the plate-like portion 15 of the holder is fitted into the fitting groove 25 of the bit, and the bolt 30 as a fixing means is inserted through the both leg portions 21a, 21b and the plate-like portion 15 and screwed. Done. This bit is easy to attach and detach.

  Most of the load that the cutter bit 7 receives during excavation is supported by the inclined surface (the upper surface 15a of the plate-like portion 15) in the engagement portion between the cutter bit 7 and the holder, and the cutter bit 7 is located at the main body beyond the forked recess. The jaw portion 8 formed by the locking step portion is engaged with the tip 13 a of the rear indicating portion 13 of the holder 5.

  The upper part of the holder 5 has a substantially triangular shape when viewed from the side, and the height of the rear side indicator 13 is considerably higher than the height of the front side indicator 12. Since it is held, an excessive force does not act on the cutter bit 7 itself.

  When the wear of the cutter bit 7 has progressed and it can no longer be used, the bit is removed and replaced with a new bit. Since the bit itself is a consumable item and its price is relatively low, economical excavation work can be performed by sequentially replacing and reusing the worn bit.

  5 and 6 show the second embodiment of the present invention, and the configuration is almost the same as that of the first embodiment, but the cutter bit 7 is located on the rear side during excavation from the bifurcated recess to the main body. In addition to forming the hook-shaped jaw portion 8 on the front side, a hook-like jaw portion 9 is formed so as to protrude on the front side, and the corner portion 9a of the jaw portion 9 is engaged with the tip 12c of the front side indication portion 12 of the holder 5. It was.

  In the case of the present embodiment, the upper portion of the holder 5 has a substantially trapezoidal shape when viewed from the side, and the height of the rear-side instruction unit 13 is higher than the height of the front-side instruction unit 12, but The front end 13a of the rear indicating unit 13 is arranged in a straight line. Correspondingly, the corner 8a of the bowl-shaped jaw 8 and the corner 9a formed by the jaw 9 are arranged in a straight line.

  The cutter bit 7 is not only formed with a hook-like jaw 8 on the rear side during excavation in the main body from the bifurcated recess, but also with a hook-like jaw 9 protruding on the front side, so it holds more firmly Is done.

  The cutter bit 7 is more sharp than the first embodiment and is suitable for hard ground. 7 and 8 show the excavator 1 (rotary cutter) as this touchment.

  Although the above embodiment was described as being used for an excavator as an apparatus for landmine disposal, the excavation tool of the present invention is an undulating and bendable arm of a heavy machinery vehicle 1 used in an excavator such as a backhoe. As long as it is an attachment instead of a bucket at the tip, it can be applied to devices other than landmine disposal devices.

It is a side view which shows 1st Embodiment of the tool for excavation of this invention. It is explanatory drawing of each part which shows 1st Embodiment of the tool for excavation of this invention. It is a front view of the 1st example of excavation equipment as an attachment. It is a side view of the 1st example of excavation equipment as an attachment. It is a side view which shows 2nd Embodiment of the tool for excavation of this invention. It is explanatory drawing of each part which shows 2nd Embodiment of the tool for excavation of this invention. It is a front view of the 2nd example of excavation equipment as an attachment. It is a side view of the 2nd example of excavation equipment as an attachment. It is a side view of the heavy machinery vehicle (base machine) which attached the excavation apparatus using the excavation tool of this invention as an attachment. It is explanatory drawing of a landmine processing apparatus. It is explanatory drawing of the conventional excavation apparatus. It is a perspective view which shows a prior art example.

DESCRIPTION OF SYMBOLS 1 ... Excavator 2 ... Rotary drum 5 ... Holder 7 ... Cutter bit 8 ... Jaw part 8a ... Corner | angular part 9 ... Jaw part 9a ... Corner | angular part 10 ... Rotating apparatus 12 ... Front side support part 12a ... Inclined surface 13 ... Rear side support part 13a ... tip 12b, 13b ... support surface 15 ... plate-like part 15a ... upper surface 17 ... hardened layer 19 ... through hole 21 ... shank part 21a, 21b ... leg part 23 ... carbide tip blade 25 ... fitting groove DESCRIPTION OF SYMBOLS 30 ... Bolt (adhering means) 40 ... Heavy machinery vehicle 40a ... Driver's seat 40b ... Crawler belt 41 ... Arm 41a ... Boom 41b ... Arm 41c ... Boom cylinder 41d ... Arm cylinder 41e ... Bucket cylinder 43a ... Link mechanism 44 ... Pin 45 ... Magnet 46 ... Rake grapple 46a ... Fixed comb blade 46b ... Movable comb blade

Claims (1)

  A holder fixed to a rotating drum that is forcibly rotated, a detachable cutter bit attached to the holder, and a drilling tool for bolting the cutter bit and the holder. A fitting groove is formed at an end of the bit. The excavation tool is provided with a plate-like portion that engages with the forked recess of the cutter bit. An excavation tool characterized in that a jaw portion is formed to protrude rearward during excavation, and a corner portion of the jaw portion is engaged with a holder end.

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