JP2009046866A - Earth drill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earth drill which is formed in a simple structure and in which a kelly-bar is surely prevented from being excessively raised during the construction. <P>SOLUTION: This earth drill comprises the kelly-bar 17 rotatably and liftably suspended from a wire rope 15 suspended from the end of a boom 12 and a kelly-bar drive 19 supported on an arm 18 installed on a body 11 and rotatingly driving the kelly-bar 17 in the state of being liftably inserted therein. An excavating bucket 20 is detachably mounted at the bottom part of the kelly-bar 17 projecting from the kelly-bar driver 19 downward. An upper stopper member 22 preventing the kelly-bar 17 from rising by coming into contact with the upper part of the excavating bucket 20 before the kelly-bar 17 reaches the upper limit is detachably mounted at the lower part of the kelly-bar driver 19. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an earth drill, and more particularly, to an earth drill including a stopper member that prevents the kelly bar from rising excessively.

In the earth drill that holds the kelly bar so that it can rotate and move up and down on the wire rope hanging from the tip of the boom that can be raised and lowered on the main body, the driver should be careful not to raise the kelly bar excessively due to overwinding of the wire rope. However, there is known a pie player provided with an overwinding alarm device for performing an overwinding alarm of a wire rope at the tip of a boom (see, for example, Patent Document 1).
JP 2000-211891 A

  However, the overwinding alarm device has a complicated structure and is costly. In addition, since the earth drill has only one wire rope for hanging the kelly bar, the kelly bar was hung when the excavation bucket was placed on the ground during construction. The wire rope twisted or bent, and the wire rope tangled with the detection wire sometimes caused the overwind alarm device to malfunction.

  In addition, in the earth drill, it is performed using a kelly bar or a boom with different lengths, or by changing the angle of the boom, for example, when using a kelly bar longer than usual, If only the state of the kelly bar projecting downward from the kelly bar driving device or the rotary table is confirmed, the upper end of the kelly bar may collide with the boom and the boom may be damaged. For this reason, it is necessary to confirm the upper end position of the kelly bar, but it is extremely difficult to visually confirm from the driver's seat with a large earth drill.

  Therefore, an object of the present invention is to provide an earth drill capable of reliably preventing the Kerryba from excessively rising with a simple structure.

  In order to achieve the above object, the first configuration of the earth drill according to the present invention includes a kelly bar suspended from a wire rope suspended from a tip end side of a boom provided in the main body so as to be rotatable and movable up and down, and the main body. A kelly bar driving device that is supported by a provided arm and rotationally drives the kelly bar in a state in which the kelly bar is inserted so as to be able to move up and down, and the excavating means can be attached to and detached from the lower end portion of the kelly bar projecting downward from the kelly bar driving device. In the mounted earth drill, an upper stopper member that comes into contact with the upper portion of the excavating means and prevents the kelly bar from rising is detachably attached to the lower portion of the kelly bar driving device before the kelly bar reaches the upper limit. A bracket member disposed on the outer peripheral side of the kelly bar is provided at a lower portion of the kelly bar driving device, and the bracket member Thereby detachably coupling the upper stopper member, it is preferable to provide a connecting portion between the bracket member and the upper stopper member up and down multiple stages.

  The second configuration of the earth drill according to the present invention is such that a rotary attached to a lower portion of the kelly bar drive device or a lower portion of the kelly bar drive device before the kelly bar reaches the upper limit. A lower stopper member is provided that is detachably attached to the lower part of the table or the lower part of the upper stopper attached to the lower part of the kelly bar driving device to prevent the kelly bar from rising.

  According to the earth drill of the present invention, even when excavating means, a boom, and a kelly bar are replaced according to the application, the wire rope is attached before the excavating means comes into contact with the upper stopper member attached to the lower part of the kelly bar driving device. By stopping the winding, it is possible to prevent an excessive increase of the Keriba. Further, even if the excavating means comes into contact with the upper stopper member, since the kelly bar does not rise any further, there is no possibility that the kelly bar collides with the boom and the boom or the like is damaged.

  Moreover, since the length of the upper stopper member protruding from the lower end of the bracket member can be adjusted by providing the connecting portion between the bracket member and the upper stopper member provided at the lower part of the Keriba drive device in multiple stages, excavation means to be used The protruding length of the upper stopper member can be adjusted in accordance with the type of the keribar, the length of the kelly bar and the boom, and the angle of the boom at the time of construction, and the ascent limit of the kelly bar can be accurately regulated.

  Further, a lower stopper member is detachably attached to the lower part of the kelly bar, and the lower stopper member is attached to the lower part of the kelly bar driving apparatus, the lower part of the rotary table mounted to the lower part of the keriba driving apparatus, and the upper stopper mounted to the lower part of the kelly bar driving apparatus By stopping the winding of the wire rope before the lower stopper comes into contact with the lower part of the upper part, it is possible to prevent the kelly bar from rising excessively as described above. Colliding with a boom or the like can be prevented.

  1 to 5 show a first embodiment of an earth drill according to the present invention. FIG. 1 is a side view of the earth drill, FIG. 2 is a side view of a kelly bar drive device, and FIG. 4 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is a sectional view taken along line VV in FIG.

  The earth drill 10 wraps a wire rope 15 from a winch 14 around a sheave 13 rotatably supported on a tip of a boom 12 provided in a self-propelled main body 11, and swivels a tip of the wire rope 15. The kelly bar 17 is rotatably suspended through the joint 16, and the kelly bar 17 is lifted and lowered by the winch 14. Further, a kelly bar drive device 19 is provided at the tip of the arm 18 supported by the main body 11 so that the kelly bar 17 can be moved up and down. The kelly bar drive device 19 rotates the kelly bar 17. It is composed. Further, a digging bucket 20 is mounted as a digging means that rotates integrally with the keliva 17 and moves up and down at a lower end portion of the kellibr 17 that protrudes downward from the kelly bar driving device 19. The excavation bucket 20 includes a hollow cylindrical earth and sand container 20a and a drill part 20b positioned below the earth and sand container 20a. By rotating integrally with the kelly bar 17, the drill part 20b excavates the ground. Then, the excavated earth and sand can be dug while being accommodated in the earth and sand accommodating part 20a.

  A cylindrical bracket member 21 disposed on the outer peripheral side of the kelly bar 17 and a cylindrical upper stopper member 22 connected to the bracket member 21 are provided at the lower portion of the kelly bar driving device 19. . The bracket member 21 is fixed to the lower end portion of the kelly bar driving device 19, and the kelly bar 17 is inserted into the inner peripheral side. The peripheral wall of the bracket member 21 is provided with connecting portions 21a of the upper stopper member 22 in three upper and lower stages at predetermined intervals in the axial direction. Each connecting portion 21a has three on the same plane orthogonal to the central axis. The connecting holes 21b are formed at equal intervals in the circumferential direction.

  The upper stopper member 22 has an inner diameter larger than the outer diameter of the bracket member 21, and three locking holes 22a are formed on the same plane perpendicular to the central axis on the peripheral wall upper side. The upper stopper member 22 is inserted into the lower portion of the bracket member 21 on the inner periphery, and the locking hole 22a is aligned with the position of one of the upper and lower three-stage connecting portions 21a formed in the bracket member 21 and the locking hole 22a. By inserting the engaging members 23 into the connecting holes 21b respectively, the upper stopper member 22 protrudes downward from the bracket member 21 by being connected to the bracket member 21 and appropriately selecting the upper and lower three-stage connecting portions 21a. The length can be adjusted.

  When the upper stopper member 22 raises the excavation bucket 20, the driver visually observes from the driver's seat before winding the wire rope 15 before the upper portion of the excavation bucket 20 contacts the lower end portion of the upper stopper member 22. By stopping, overwinding of the wire rope 15 is prevented, and the upper end of the kelly bar 17 is prevented from colliding with the boom 12. Even when the timing of stopping the winding of the wire rope 15 is delayed and the upper portion of the excavation bucket 20 comes into contact with the lower end portion of the upper stopper member 22, the kelly bar 17 is prevented from further rising due to the contact between the two. Thus, overwinding of the wire rope 15 can be reliably prevented.

  The length of the upper stopper member 22 protruding from the bracket member 21 may be appropriately set in consideration of the type of excavating means used, the length of the kelly bar 17 and boom 12 used, the angle of the boom 12 during construction, and the like. . Further, by appropriately setting the strength of the bracket member 21, the upper stopper member 22 and the engaging member 23, the protection function of the hydraulic circuit for winding the wire rope when the excavation bucket 20 contacts the upper stopper member 22 is achieved. When activated, the winding of the wire rope can be automatically stopped.

  In the earth drill 10 formed as described above, the kelly bar 17 is installed perpendicular to the ground at the time of construction, the wire rope 15 is unwound from the winch 14, and the kelly bar 17 suspended from the wire rope 15 is lowered. By rotating the kelly bar 17 by the kelly bar driving device 19, the ground is excavated by the drill part 20b of the excavating bucket 20, and the excavated earth and sand is dug while being accommodated in the earth and sand accommodating part 20a.

  When a predetermined amount of earth and sand is stored in the earth and sand container 20a, the wire rope 15 is wound up, the kelly bar 17 is lifted, the excavation bucket 20 is raised to a predetermined position, and the earth and sand in the earth and sand container 20a is discharged. The excavation work is resumed again. At this time, the rising limit of the excavating bucket 20 is that the excavating bucket 20 is excessively raised because the driver can easily check visually from the driver's seat according to the distance between the excavating bucket 20 and the upper stopper member 22. Therefore, it is possible to reliably prevent the tip of the boom 12, the sheave 13, the swivel joint 16 and the like from being damaged due to the collision with the upper end of the kelly bar 17.

  Further, the lower stopper member 24 may be attached to the lower portion of the kelly bar 17. The lower stopper member 24 is composed of a pair of semicircular arc-shaped members, and includes a holding portion 24a that holds the kelly bar 17 and is bolted thereto, and a flange portion 24b provided on the upper portion of the holding portion 24a. And have. By providing such a lower stopper member 24 at a position below the kelly bar 17 and in contact with the upper stopper member 22 before the kelly bar 17 reaches the upper limit, the excavation bucket 20 is urged against the upper stopper member 22. It is possible to prevent the excavation bucket 20 from being damaged due to frequent collisions.

  When the lower stopper member 24 is attached, the lower stopper member 24 may be brought into contact with the lower portion of the kelly bar drive device 19 without attaching the upper stopper member 22. It can also be formed in the same cylindrical shape.

  FIG. 6 is a side view of an earth drill showing a second embodiment of the present invention. Components that are the same as those in the first embodiment are denoted by the same reference numerals, and the detailed description thereof is as follows. Omitted.

  In the second embodiment, the boom used in the earth drill of the first embodiment is replaced with a shorter boom 31, and the boom 31 is tilted forward than the first embodiment, and the same length as the first embodiment. The state at the time of excavation construction using the kelly bar 17 is shown. The upper stopper member 22 used in this embodiment is longer than the first embodiment, and the bracket member 21 is not provided with the function of adjusting the protruding length of the upper stopper member 22. . Thus, the same effect as the first embodiment can be obtained also by using the upper stopper member 22 having a length set according to the construction situation. Also in this embodiment, the lower stopper member 24 can be attached to the lower portion of the kelly bar 17 in the same manner as described above.

  The means for attaching the bracket member 21 to the lower portion of the kelly bar drive device 19 is arbitrary. For example, a flange is provided on the outer periphery of the upper end of the bracket member 21, and this flange can be attached to and detached from the lower surface of the kelly bar drive device 19 with bolts. It is possible to adopt a structure that is fixed to the surface. Further, it is possible to directly fix the upper end portion of the upper stopper member 22 to the lower portion of the kelly bar driving device 19 without using the bracket member 21.

  7 to 9 are side views of an earth drill showing a third embodiment of the present invention. In this embodiment, an example in which the bottomed bucket 41 is attached to the lower end portion of the kelly bar 17 is shown. As described above, when the bottomed bucket 41 is mounted, a plurality of hydraulic hoses 42 for supplying hydraulic fluid to the cylinders and the like for opening and closing the bottomed blades 41 a of the bottomed bucket 41 are disposed below the kelly bar drive device 19. The rotary table 43 thus provided is provided in a state of rotating integrally with the kelly bar 17.

  Thus, when constructing using the widened bucket 41 and the rotary table 43, the lower stopper member 24 as shown in the first embodiment may be attached. A hose holding member 44 that holds the connected hydraulic hose 42 can be used as a lower stopper member. The hose holding member 44 is formed by a fitting portion 44a that fits into a square shaft portion at the lower end of the kelly bar 17, and a plurality of hose holding pieces 44c each having a hose holding portion 44b, and has raised the kelly bar 17. Sometimes, the hose holding member 44 comes into contact with the lower portion of the rotary table 43 before the kelly bar 17 collides with the boom 12. Therefore, when the construction with the bottomed bucket 41 is performed, the bottomed bucket 41 and the rotary table 43 are in a position where the driver can easily see them. However, even if the wire rope 15 is accidentally wound up excessively, the hose holding member 44 contacts the lower part of the rotary table 43 to prevent the kelly bar 17 from rising and protect the boom 12 and the like. In addition, the bottom expansion bucket 41 and the rotary table 43 can be prevented from directly colliding with each other and being damaged.

It is a side view of the earth drill which shows the 1st form example of this invention. It is a side view of a Keriba drive device similarly. It is a principal part enlarged side view of a Keriba drive device similarly. It is IV-IV sectional drawing of FIG. It is VV sectional drawing of FIG. It is a side view of the earth drill which shows the 2nd form example of this invention. It is a side view of the earth drill which shows the 3rd form example of this invention. It is a front view of the principal part It is IX-IX sectional drawing of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Earth drill, 11 ... Main body, 12 ... Boom, 13 ... Sheave, 14 ... Winch, 15 ... Wire rope, 16 ... Swivel joint, 17 ... Keriba, 18 ... Arm, 19 ... Keriba drive device, 20 ... Excavation bucket, 20a ... earth and sand container, 20b ... drill part, 21 ... bracket member, 21a ... connecting part, 21b ... connecting hole, 22 ... upper stopper member, 22a ... locking hole, 23 ... engaging member, 24 ... lower stopper member, DESCRIPTION OF SYMBOLS 31 ... Boom, 41 ... Bottom expansion bucket, 41a ... Bottom expansion blade, 42 ... Hydraulic hose, 43 ... Rotary table, 44 ... Hose holding member, 44a ... Fitting part, 44b ... Hose holding part, 44c ... Hose holding piece

Claims (3)

A kerry bar that is rotatable and can be lifted and lowered by a wire rope hanging from the tip side of a boom provided in the main body, and a kelly bar that is supported by an arm provided in the main body and that is inserted in the kerry bar so as to be lifted and lowered. A ground drill in which a drilling means is detachably attached to a lower end portion of the kelly bar projecting downward from the kelly bar driving device. An earth drill, wherein an upper stopper member that comes into contact with the upper portion of the excavating means and prevents the rise of the kelly bar is detachably attached before reaching the position. A bracket member disposed on the outer peripheral side of the kelly bar is provided at a lower portion of the kelly bar driving device, and the upper stopper member is detachably connected to the bracket member, and a connecting portion between the bracket member and the upper stopper member is provided. The earth drill according to claim 1, wherein the earth drill is provided in upper and lower stages. A kerry bar that is rotatable and can be lifted and lowered by a wire rope hanging from the tip side of a boom provided in the main body, and a kelly bar that is supported by an arm provided in the main body and that is inserted in the kerry bar so as to be lifted and lowered. A ground drill in which a drilling means is detachably attached to a lower end portion of the kelly bar projecting downward from the kelly bar driving device, and the kelly bar reaches the lower limit of the kelly bar. Before, the lower part of the Keriba driving device, the lower part of the rotary table mounted on the lower part of the Keriba driving device, or the lower part of the upper stopper mounted on the lower part of the Keriba driving device, An earth drill characterized in that a lower stopper member for preventing ascent is detachably attached.

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