JP4697888B2 - Drilling rig - Google Patents

Description

  The present invention relates to a drilling rig having an enlarged wing.

In a conventional excavator, for example, as described in Japanese Patent Application Laid-Open No. 2006-9540 (Patent Document 1), the enlarged wing rotates around a rotation shaft provided outside the outer rod. A flange that supports the rotating shaft is provided in a state of protruding to the outside of the outer rod. In addition, the rotating shaft is provided along the peripheral surface of the outer rod, and the enlarged wings protrude in the radial direction of the outer rod. Therefore, even when the expansion wing is not in the storage position, the expansion wing or the flange may protrude greatly to the outside of the outer rod, which may hinder the rotation of the outer rod or the movement of excavated earth and sand.
JP 2006-9540 A

  The problem to be solved is that the enlarged wing, the flange supporting the rotating shaft, and the like protrude greatly from the outer rod.

  The excavator of the present invention includes a cylindrical outer rod (11), a rotation drive device (3) for rotating the outer rod, an inner rod (13) inserted into the outer rod, and an upper end of the inner rod. An elevating device (21) for raising and lowering the upper and lower parts, a rack (53) provided at a lower portion of the inner rod and including at least a pair of rack tooth rows (54), and screwing into the rack tooth rows, The rotating shaft (57) includes a pinion (56) projecting to the outside of the outer rod, and an enlarged wing (7) provided at an end of the rotating shaft of the pinion, and the central axis of the rotating shaft of the pinion is It extends in the radial direction of the outer rod.

  A flat surface (64) is formed on the peripheral surface of the outer rod, and when the inner rod moves up and down with respect to the outer rod, the expansion wing is disposed in a position substantially parallel to the longitudinal direction of the outer rod, and the outer rod. When the enlargement blade is in the storage position, the enlargement blade overlaps the flat surface of the outer rod.

  Moreover, the outer rod may be provided with a bearing portion (63) for bearing the rotation shaft of the pinion.

  Furthermore, a pair of rack tooth row | line | columns may be arrange | positioned on the diagonal position on both sides of the center axis line of an inner rod.

  According to the present invention, the pinion provided with the enlarged wing at the end of the rotating shaft has the center axis of the rotating shaft extending in the radial direction of the outer rod, so that the flange for supporting the rotating shaft Is not required to be provided outside the outer rod, and when the magnifying wing is in the storage position, the magnifying wing overlaps the side surface of the outer rod and can prevent the outer rod from rotating. . In addition, the lifting device lifts and lowers the upper end of the inner rod, and with this lifting, the expansion wing is rotated to the expansion position or the storage position via the rack and pinion. It is linked. Therefore, if the upper end of the inner rod is monitored, the position of the enlarged blade can be accurately determined.

Then, a flat surface is formed on the peripheral surface of the outer rod, and when the inner rod moves up and down with respect to the outer rod, the expansion wing is disposed in a storage position substantially parallel to the longitudinal direction of the outer rod, rotated between a substantially perpendicular enlargement position longitudinally, when the expanding blade is in the retracted position, since larger wing overlaps the flat surface of the outer rod, the storage position expanding wings of the outer rod The side surfaces can be stacked in an orderly manner, and the outer rod can be rotated more smoothly.

  In addition, when the outer rod is provided with a bearing that supports the rotation shaft of the pinion, the seal structure of the outer rod becomes a simple structure, and as much as possible to prevent dirt and sand from entering the outer rod. Can do.

  Further, when the pair of rack tooth rows are arranged diagonally across the central axis of the inner rod, the balance is improved and the rack can be moved up and down smoothly.

  The purpose of rotating the outer rod more smoothly through the rack and pinion is to raise and lower the inner rod without causing the expansion blade and the flange that supports its rotating shaft to protrude significantly from the outer rod. This was realized by rotating and extending the central axis of the rotation axis of the pinion in the radial direction of the outer rod.

  Next, an embodiment of the excavator according to the present invention will be described with reference to FIGS. FIG. 1 is a side view of an embodiment of an excavator according to the present invention. FIG. 2 is an explanatory view of the front of the upper part of the excavator. FIG. 3 is a cross-sectional view of the extension element. FIG. 4 is a front view of the lower part of the excavator with the enlarged wings in the stowed position. FIG. 5 is a front view of the lower part of the excavator with the expansion blade in the expansion position. 6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. FIG. 8 is a cross-sectional view taken along the line VII-VII of FIG. 2, FIG. 4, and FIG. 5 are partially shown in cross section. Moreover, in FIG. 6, illustration of the screw plate is omitted.

First, the overall configuration of the excavator will be described with reference to FIG.
The screw auger excavator includes a traveling vehicle body 1, a leader 2 standing on the traveling vehicle body 1, a prime mover 3 as a rotational drive device such as an electric motor attached to the reader 2 so as to be movable up and down, An auger 4 that is rotationally driven by the prime mover 3, an excavation head 6 provided at the lower end of the auger 4, and a lever-shaped enlarged wing 7 provided above the excavation head 6 are provided.

  The auger 4 includes a cylindrical outer rod 11, a screw plate 12 that is spirally fixed around the outer rod 11, and a cylindrical inner rod 13 that is inserted into the outer rod 11. It is equipped with. The auger 4 is configured to be divided into a plurality of elements in the axial direction, and the length of the auger 4 can be appropriately changed by attaching and detaching the extension element 14 shown in FIG.

  In FIG. 2, a pair of left and right prime movers 3 are provided, and the upper end portion of the outer rod 11 is rotationally driven via a gear 16. The inner rod 13 is inserted so as to be movable up and down with respect to the outer rod 11, and its upper end can be moved up and down by a hydraulic cylinder 21 such as a pair of left and right hydraulic cylinders. When the hydraulic cylinder 21 as the lifting device is operated, the inner rod 13 can be moved up and down relatively with respect to the outer rod 11. The upper end of the inner rod 13 can be connected to the pipe 23 via a swivel. From the pipe 23, fluid such as pressurized air, water, cement, drilling fluid, and root-setting fluid can be supplied into the inner rod 13.

  An upper connection portion 32 at the upper end of the outer rod 11 of the extension element 14 is connected to the connection portion 31 provided at the lower end portion of the upper element 26 of the outer rod 11. Further, a lower connection portion 33 that connects the upper connection portion 32 of the outer rod 11 of the lower extension element 14 is provided at the lower end of the outer rod 11 of the extension element 14.

  The connecting portion 37 provided at the lower end portion of the upper element 36 of the inner rod 13 is connected to the upper connecting portion 38 at the upper end of the inner rod 13 of the extension element 14. Further, a lower connection portion 39 for connecting the upper connection portion 38 of the inner rod 13 of the lower extension element 14 is provided at the lower end of the inner rod 13 of the extension element 14. Further, a flange 41 is provided on a part of the outer peripheral surface of the inner rod 13 of the extension element 14, and the flange 41 slides on the inner surface of the outer rod 11.

  4 to 8, a rack 53 is provided at an intermediate portion of the lower element 51 of the inner rod 13. The cylindrical portion of the inner rod 13 is continuously formed even at the rack 53, and the fluid flowing from the upper portion of the inner rod 13 can flow below the rack 53. The rack 53 is H-shaped in a plan view as shown in FIG. 6, and has a square shape in a front view as shown in FIG. The rack 53 moves up and down in conjunction with the inner rod 13, and rack tooth rows 54 are linearly formed vertically on the right front side and the left back side in FIG. 6. In this way, the pair of rack tooth rows 54 of the rack 53 are arranged diagonally and inward with the central axis of the inner rod 13 in between. A pinion 56 is screwed into each rack tooth row 54. The pinion 56 is provided with teeth that engage with the rack tooth row 54 in an arcuate shape, and a rotating shaft 57 that protrudes outward.

  On the other hand, a space in which the rack 53 and the pinion 56 are arranged is formed inside the lower element 61 of the outer rod 11, and the rack 53 is slidably guided up and down. Further, the lower element 61 is provided with a bearing portion 63 for bearing the rotation shaft 57 of the pinion 56. A flat surface 64 is formed to extend in the vertical direction on the peripheral surface of the outer rod 11 in the vicinity of the portion where the bearing portion 63 is provided. The flat surface 64 has a shape obtained by cutting an arc-shaped portion at the peripheral edge of the circular cross section of the outer rod 11.

  The rotation shaft 57 of the pinion 56 passes through the bearing portion 63 and protrudes outside the outer rod 11. The enlarged wing 7 is attached to the tip of the rotating shaft 57 of the pinion 56, and the enlarged wing 7 rotates integrally with the rotating shaft 57. When the inner rod 13 moves up and down with respect to the outer rod 11, the expansion blades 7 are interlocked via the rack 53 and the pinion 56, and the space between the storage position illustrated in FIG. 4 and the expansion position illustrated in FIG. Rotate. When the expansion wing 7 is in the storage position, it overlaps the flat surface 64 of the outer rod 11 as shown in FIG. On the other hand, when the expansion blade 7 is in the expansion position, it protrudes outward from the outer rod 11 as shown in FIG.

  The lower end of the lower element 61 of the outer rod 11 has a bottomed shape, and a pipe 67 on which the inner rod 13 is slidably fitted is erected on the upper surface of the bottom plate 66. Further, a through hole 68 is formed in the bottom plate 66 so that fluid from the inner rod 13 is discharged below the outer rod 11 through the pipe 67. A plurality of excavation claws 71 are provided below the lower element 61 and the screw plate 12 to constitute the excavation head 6.

  A connecting portion 76 connected to the lower connecting portion 33 of the outer rod 11 of the extension element 14 or the connecting portion 31 of the lower end portion of the upper element 26 of the outer rod 11 is connected to the upper end portion of the lower element 61 of the outer rod 11. Is provided. Further, the upper end portion of the lower element 51 of the inner rod 13 is connected to the lower connecting portion 39 of the inner rod 13 of the extension element 14 or the connecting portion 37 of the lower end portion of the upper element 36 of the inner rod 13. A portion 77 is provided.

  When excavating a hole in the ground with the excavator constructed in this way, the inner rod 13 is lowered by the hydraulic cylinder 21 to bring the expansion blade 7 into the storage position shown in FIGS. 4 and 7. . Then, the prime mover 3 is operated to rotate the outer rod 11 and the excavation head 6 through the gear 16. A hole is excavated in the ground by the rotation of the excavation head 6. In addition, a driving device (not shown) that moves the motor 3, the outer rod 11, the inner rod 13, the gear 16 and the hydraulic cylinder 21 and the like up and down along the reader 2 is provided. Similarly to the conventional one, the structure (portion shown in FIG. 2) where the prime mover 3 is provided is lowered along the reader 2.

  When the lower end of the hole excavated in this way is expanded, the hydraulic cylinder 21 is operated to raise the inner rod 13 while the excavation head 6 is at the bottom of the excavated hole, The expansion blade 7 is set to the expansion position illustrated in FIGS. 5 and 8. The prime mover 3 is operated substantially simultaneously with the operation of the hydraulic cylinder 21 to rotate the outer rod 11. Then, the expansion wing 7 at the expansion position also rotates integrally with the outer rod 11, and the lower part of the hole is expanded.

  When the excavation head 6 is removed from the excavated hole, the inner rod 13 is lowered by the hydraulic cylinder 21 to bring the enlarged blade 7 into the storage position shown in FIGS. Then, the structure (portion shown in FIG. 2) provided with the prime mover 3 is raised along the reader 2 in the same manner as the conventional one.

  Further, when excavating and expanding the above-mentioned hole, a fluid such as pressurized air, water, cement, drilling fluid, rooting fluid or the like is appropriately supplied from the pipe 23 into the inner rod 13, and the outer It can be discharged from the through hole 68 of the bottom plate 66 of the lower element 61 to the ground through the pipe 67 of the lower element 61 of the rod 11.

  As described above, in the embodiment, by moving the inner rod 13 up and down with respect to the outer rod 11, the expansion blade 7 can be set to the expansion position or the storage position. It is also possible to stop the expansion wing 7 halfway between the expansion position and the storage position. And when the expansion wing | blade 7 exists in a storage position, the expansion wing | blade 7 is along the side surface of the outer rod 11, and it can prevent protruding from the outer rod 11 as much as possible. Further, unlike the prior art, a flange or the like that supports the rotating shaft of the enlarged blade is not provided outside the outer rod 11. As a result, it is possible to prevent the outer rod 11 from being obstructed as much as possible.

  The outer rod 11 is provided with a bearing portion 63 for bearing the rotating shaft 57 of the pinion 56, but this sealing can be performed with a simple structure. Therefore, when the mechanism for driving the expansion blade 7 is installed on the outer rod 11, the outer rod 11 can be easily sealed as compared with the conventional one.

  Further, since the rotation of the expansion blade 7 is interlocked with the vertical movement of the inner rod 13 by the rack and pinion mechanism of the rack 53 and the pinion 56, when the position of the upper end portion of the inner rod 13 is confirmed, It can be easily seen whether the expansion blade 7 is in the expansion position, the storage position, or the intermediate position. That is, it can be seen that when the hydraulic cylinder 21 is lowered, the enlarged blade 7 is in the retracted position, while when the hydraulic cylinder 21 is raised, the enlarged blade 7 is in the enlarged position. Further, when the hydraulic cylinder 21 stops in the middle of ascending or descending, the amount of protrusion of the expanding blade 7 can be determined depending on the degree.

As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example, A various change is performed within the range of the summary of this invention described in the claim. It is possible. Examples of modifications of the present invention are illustrated below.
(1) The number of rack tooth rows 54 may be at least a pair, and may be three or more.
(2) The rack tooth row 54 is preferably arranged diagonally across the central axis of the inner rod 13 for balance, but can be changed as appropriate.

(3) When the inner rod 13 is lowered, the enlarged wing 7 is in the storage position, but when the inner rod 13 is raised, the enlarged wing 7 can be in the enlarged position. is there.

(4) The screw plate 12 only needs to be provided so as not to hinder the displacement of the expansion blade 7, and can be provided over the entire length of the outer rod 11 or can be provided partially.
(5) The lifting device for the inner rod does not necessarily need to be the hydraulic cylinder 21, and if the inner rod 13 can be moved up and down, its type and structure can be changed as appropriate.

(6) The inner rod is not necessarily cylindrical.
(7) The expansion blade 7 can be stopped at an arbitrary position between the expansion position and the storage position. However, it is also possible to configure so that it can be stopped only at the two positions of the enlarged position and the storage position.
(8) Although the vertical movement of the hydraulic cylinder 21 (that is, the vertical movement of the inner rod 13) can be visually observed, it can also be monitored by a detection signal such as a proximity sensor instead of visual observation. . Since this sensor is provided in the vicinity of the hydraulic cylinder 21, it is not exposed to an inferior environmental condition in the ground, and maintenance and the like can be easily performed.

  When the inner wing moves up and down, the expansion wing is rotated through the rack and pinion, and the central axis of the rotation axis of this pinion extends in the radial direction of the outer rod. The outer rod can be smoothly rotated so as to overlap the side surface of the outer rod. Therefore, it is optimal to apply to a drilling rig equipped with an enlarged wing.

FIG. 1 is a side view of an embodiment of an excavator according to the present invention. FIG. 2 is an explanatory view of the front of the upper part of the excavator. FIG. 3 is a cross-sectional view of the extension element. FIG. 4 is a front view of the lower part of the excavator with the enlarged wing in the retracted position. FIG. 5 is a front view of the lower part of the excavator with the expansion blade in the expansion position. 6 is a cross-sectional view taken along line VI-VI in FIG. FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. FIG. 8 is a cross-sectional view taken along the line VII-VII of FIG.

Explanation of symbols

3 prime mover (rotary drive)
7 Expanding wing 11 Outer rod 13 Inner rod 21 Hydraulic cylinder (lifting device)
53 Rack 54 Rack tooth row 56 Pinion 57 Pinion rotating shaft 63 Bearing portion 64 Flat surface of outer rod

Claims (3)

A cylindrical outer rod;
A rotation drive device for rotating the outer rod;
An inner rod inserted into the outer rod;
An elevating device that elevates and lowers the upper end of the inner rod;
A rack provided at a lower portion of the inner rod and having at least a pair of rack tooth rows;
A pinion that is screwed into the rack tooth row and whose rotating shaft projects outside the outer rod;
With an enlarged wing provided at the end of the rotation shaft of this pinion,
The center axis of the rotary shaft of the pinion extends in the radial direction of the outer rod,
A flat surface is formed on the peripheral surface of the outer rod ,
When the inner rod moves up and down with respect to the outer rod, the expansion wing rotates between a storage position substantially parallel to the longitudinal direction of the outer rod and an expansion position substantially perpendicular to the longitudinal direction of the outer rod ,
The excavator according to claim 1, wherein when the expansion wing is in the storage position, the expansion wing overlaps a flat surface of the outer rod . The excavator according to claim 1, wherein the outer rod is provided with a bearing portion for bearing a rotation shaft of a pinion. The excavator according to claim 1 or 2, wherein the pair of rack tooth rows are arranged diagonally across the central axis of the inner rod.

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