JP2008014015A - Earth drill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earth drill, preventing a boom and a front frame from interfering with each other in auxiliary hoist work in a simple structure, and reducing the weight of the boom. <P>SOLUTION: This earth drill includes: a boom 6 fitted to a revolving structure 2 installed on a traveling body 1 like a derrick; a front frame 7 where a frame 9a of a kelly drive device 9 is fitted to the top thereof; a Kelly-bar 10 penetrating through a rotary driver of the Kelly drive device 9, with the lower end fitted with a drill; and a main hoisting winch 12 and an auxiliary winch 13 mounted on the revolving structure 2. In the case of the auxiliary hoisting work, the front frame 7 is brought to the boom 6 side. The front frame 7 is fitted to a pivoted shaft integrally with a pivoted shaft 20 of the boom 6 or coaxially on a separate body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an earth drill including a front frame with a boom mounted on a swinging body installed on a traveling body so that the boom can be raised and lowered, and a kerry drive device attached to the upper part.

  In the earth drill, a kelly drive device is attached to the upper part of the front frame, a kelly bar is inserted into the hole of the rotary drive body of the kelly drive device so that it can move up and down and not relatively rotatable, and an earth drill bucket is attached to the lower end of the kelly bar The kelly bar is connected to and supported by a main winding rope that is wound up from a main winding winch mounted on the revolving body and suspended from the top of the boom via a swivel joint (rotary joint).

  At the time of excavation, the kelly bar is rotated together with the rotary drive body by the operation of the hydraulic motor provided in the kelly drive device, and the weight of the kelly bar and the bucket or, if necessary, the press device provided in the kelly drive device. Excavation is carried out by applying a load to the bucket, and when the bucket is filled with earth and sand, the main hoist winch is used to repeat the work of lifting the bucket to the ground and discharging it. Drill a hole.

  In the conventional earth drill, the front frame to which the kelly drive device is attached is, as shown in FIGS. 1, 2, and 3 of Patent Document 1, from the pivot shaft of the boom on the revolving structure installed on the traveling body. It is attached so that it can be raised and lowered around a pivot shaft provided at the front part. In such a conventional earth drill, a hydraulic cylinder for raising and lowering the front frame is provided between the boom and the front frame, or a wire rope that is wound and fed along with expansion and contraction of the hydraulic cylinder is used as the boom. Hanging around the front frame.

  In such an earth drill, an auxiliary hanging work is performed using an auxiliary winch mounted on a revolving structure. In this auxiliary suspension work, after excavation with a fixed-diameter axial digging bucket is completed, it is necessary to attach a widened bucket (a bucket for excavating a taper-shaped widened portion expanded to the bottom of a vertical hole) instead of an axial digging bucket. In some models, there are tremely pipes and rebars that are used for transporting buckets and their bases to perform this bucket replacement work, or for pouring concrete into the vertical holes after the vertical hole excavation is completed. It is an operation to hang up.

  Such an auxiliary suspending work is performed by suspending an object with an auxiliary winding rope that is wound and fed by an auxiliary winch and hangs down from a sheave at the top of the boom. When performing this auxiliary suspension work, the bucket is removed from the kelly bar, and the front frame is held on the boom side so that the front frame and the kelly drive device do not interfere with the auxiliary suspension work.

  In the conventional earth drill, as described above, the front frame is also connected to the boom by a hydraulic cylinder or wire rope for raising and lowering the front frame. It undulates in response to the boom undulations. When the boom is raised and lowered, the conventional earth drill uses the pivoting part of the front frame as the front part of the pivoting part of the boom in the revolving structure. Then, there is a problem that the boom and the front frame interfere with each other.

  In order to solve such a problem, in Patent Document 2, in order to detect whether the operation direction of the boom is the direction of tilting or the direction of raising, a means for detecting pilot hydraulic pressure to the control valve is provided, and the boom An electro-hydraulic circuit that automatically operates the control valve of the front frame in the direction of tilting when operated in the direction of tilting, and automatically operates in the direction of raising the control valve of the front frame when operated in the direction of raising the boom (Interlocking circuit) is proposed.

  In Patent Document 3, for the same purpose as Patent Document 2, in addition to the boom raising and lowering cylinder, an interlocking cylinder is provided between the boom and the turning body, and this interlocking cylinder and the front frame hoisting cylinder (this cylinder is a boom). Are provided between the front frame and the front frame, and the undulation of the front frame is linked to the undulation of the boom.

  Further, FIG. 4 of Patent Document 1 discloses a boom provided with a front frame pivoting portion.

JP 2001-164865 A Japanese Patent Laid-Open No. 2002-327587 Japanese Patent Application Laid-Open No. 2002-285776

  As described in Patent Documents 2 and 3, in the auxiliary suspension work, in the case where the undulation of the front frame is interlocked with the undulation of the boom, firstly, it is necessary to add a control circuit for interlocking, or extra liquid There is a problem that a pressure cylinder is necessary. Secondly, in cases other than auxiliary suspension work, it is necessary to raise and lower the front frame independently without being interlocked with the boom. Therefore, there is a problem in that switching means to be used is also required, and additional devices and operations are required.

  On the other hand, in the conventional earth drill in which the front frame is attached to the boom so that it can be raised and lowered, the boom is supported by the boom when the excavation is performed by rotating the earth drill bucket. Therefore, it is necessary to increase the rigidity of the boom, which increases the weight of the boom, reduces the load that can be lifted, and decreases the stability of the earth drill.

  In view of the above problems, an object of the present invention is to provide an earth drill that can prevent interference between a boom and a front frame in an auxiliary suspension work with a simple structure and that requires a light boom.

A ground drill according to claim 1 is a boom attached to a swinging body installed on a traveling body so as to be raised and lowered,
A front frame with the frame of the Kelly drive device attached to the top;
A kelly bar penetrating the rotary drive body of the kelly drive device and attaching a drilling tool to the lower end;
A main winding winch and an auxiliary winch mounted on the revolving structure,
A main winding rope wound and fed by the main winding winch is suspended from the top of the boom and connected to a kelly bar via a swivel joint,
Auxiliary winding rope wound down by the auxiliary winch is suspended from the top of the boom to perform auxiliary suspension work,
In the arm drill that embraces the front frame to the boom side during the auxiliary suspension work,
The front frame is mounted so as to be able to be raised and lowered coaxially with the pivot shaft of the boom.

The earth drill according to claim 2 is the earth drill according to claim 1,
The front frame is characterized in that a base end portion is formed in a bifurcated shape so as to sandwich the boom from both sides.

The ground drill according to claim 3 is the ground drill according to claim 1 or 2,
A hydraulic cylinder is provided between the top of the front frame and the frame of the kelly drive device to rotate the frame of the kelly drive device relative to the front frame.

The earth drill according to claim 4 is the earth drill according to any one of claims 1 to 3,
The boom pivot shaft and the front frame pivot shaft are separated,
The second bracket for inserting the pivot shaft of the front frame is provided on both sides of the pair of first brackets for inserting the pivot shaft of the boom,
The pivot mounting shaft insertion hole of the second bracket is coaxial with the pivot mounting shaft insertion hole of the first bracket and is larger than the pivot mounting shaft insertion hole of the first bracket. To do.

  In the first aspect of the invention, when the boom is raised and lowered during the auxiliary suspension work, the boom and the front frame connected by a hydraulic cylinder or a wire rope are also raised and lowered simultaneously, but the boom and the front frame are coaxial. Since it is pivotally attached, the boom and the front frame do not interfere with each other because there is no change in the relative positional relationship between the boom and the front frame regardless of the inclination angle of the boom. Further, since it is not necessary to provide an interlocking circuit for interlocking the boom undulation and the front frame undulation, an operation for switching the interlocking circuit is not necessary in excavation work other than the auxiliary suspension work.

  Thus, according to the first aspect of the present invention, there is no need for detecting means, an interlocking circuit or an interlocking cylinder for interlocking the boom and the front frame in the auxiliary suspension work, and the interlocking circuit is put into an operating state or inoperative. Switching means for setting the state becomes unnecessary, and the problem of interference between the boom and the front frame can be solved with a simple structure. Further, the operation of the switching means becomes unnecessary, and a highly reliable earth drill can be provided in combination with the simplification of the structure.

  In addition, the boom can be reduced in weight, the lifting load can be increased, and the stability can be improved as compared with the conventional earth drill in which the front frame is carried on the boom.

  The invention of claim 2 has an advantage that the boom itself can be implemented without modification from the conventional one because the base end portion of the front frame is formed in a bifurcated shape so as to sandwich the boom from both sides.

  In the invention of claim 3, since the hydraulic cylinder for adjusting the inclination angle of the kelly drive device is provided between the top of the front frame and the frame of the kelly drive device, the rear surface of the front frame, the frame of the kelly drive device, Compared with the case where the hydraulic cylinder is provided in between, the hydraulic cylinder does not protrude to the boom side, and the front frame can be brought closer to the boom side.

  In the invention of claim 4, since the pivot shaft and the pivot bracket are separately provided for the boom and the front frame, the front frame can be pivotally mounted after the boom is pivotally mounted. It is not necessary to simultaneously align the bracket with the pivot shaft insertion hole, and the boom and front frame can be pivoted easily. Further, since the pivot mounting shaft insertion hole of the second bracket is made larger than the pivot mounting shaft insertion hole of the first bracket, the boom pivot mounting shaft is inserted into the pivot mounting shaft insertion hole of the first bracket. Can be easily performed through the pivot mounting shaft insertion hole of the second bracket.

  FIG. 1 is a side view showing an embodiment of an earth drill according to the present invention in a configuration capable of excavating the ground, and FIG. 2 is a side view showing the earth drill in a configuration capable of auxiliary suspension work. 1 and 2, reference numeral 1 denotes a crawler type traveling body, and reference numeral 2 denotes a revolving body installed on the traveling body 1 via a revolving device 3. On the swivel body 3 are mounted a power unit 4, an operator cab 5, and the like including a hydraulic pressure source of an actuator such as a hydraulic cylinder and a hydraulic motor of each part to be described later and a generator as a power source.

  Reference numeral 6 denotes a boom, 7 denotes a front frame, and 9 denotes a kelly drive device attached to the upper portion of the front frame 7 via a frame 9a. The kelly drive device 9 is a known one. Although the case where the boom 6 is a multistage telescopic type is shown in the present embodiment, a non-expandable boom may be used. Reference numeral 10 denotes a kelly bar which is inserted in a rotary drive body (not shown) of the kelly drive device 9 so as to be movable up and down and not relatively rotatable. Reference numeral 11 denotes a shaft excavation bucket attached to the lower end of the kelly bar 10. It has a conical bottom lid 11a having an excavation claw and a sand intake.

  Reference numerals 12 and 13 denote main winding winches and auxiliary winches mounted on the revolving body 2, and reference numerals 14 and 15 denote main winding ropes and auxiliary winding ropes which are wire ropes wound up by the main winding winch 12 and auxiliary winch 13, respectively. . The main winding rope 14 hangs down from the sheave 16 at the top of the boom 6 and is connected to the kelly bar 10 via a swivel joint (rotary joint) 17. Normally, the kelly bar 10 is formed by fitting a plurality of different size kelly bars that can move up and down relatively and cannot rotate relative to each other. The main winding rope 14 is connected. The auxiliary winding rope 15 is suspended from the sheave 18 at the top of the boom 6, and the auxiliary object 19 is lifted by the hook 15 a to perform the auxiliary hanging work.

  As shown in FIG. 3, the boom 6 and the front frame 7 are attached so that they can be raised and lowered around the same pivot shaft 20 provided on a bracket 2 a provided on the revolving structure 2. Reference numeral 21 denotes a boom hoisting cylinder. The cylinder 21 has one end connected to the bracket 2 a by a pin 22 and the other end connected to a bracket 23 provided on the front surface of the boom 6 by a pin 24.

  As shown in FIGS. 3 and 4, the front frame 7 of the present embodiment includes a base end portion 7a attached to both sides of the boom 6 so as to be able to undulate around the pivot shaft 20, and the base end portion 7a. And an upper portion 7b provided integrally with the upper portion. The base end portion 7a of the front frame 7 is formed in a bifurcated shape so that the boom 6 is sandwiched from both sides by the base end portion 7a.

  Reference numeral 25 denotes a front frame hoisting cylinder. The cylinders 25 are provided on the left and right sides of the boom 6. As shown in FIGS. 3, 5, and 6, one end is connected to a bracket 26 provided on the boom 6 by a pin 27, The other end is connected and attached to a bracket 29 provided on the upper surface of the front frame 7 by a pin 30.

  As shown in FIGS. 3 and 7, the frame 9a of the kelly drive device 9 is rotatably attached to the upper portion of the upper frame 7b around the left and right pins 32. Reference numeral 33 denotes a cylinder for rotating the frame 9a. The cylinder 33 is provided between the left and right guide columns 9b constituting a part of the frame 9a and the top of the upper frame 7b.

  The kelly drive device 9 is attached along the guide column 9b so as to be movable up and down. Reference numeral 34 denotes a cylinder for moving the kelly drive device 9 up and down.

  In FIG. 3, reference numerals 35 and 36 indicated by two-dot chain lines at the bottom of the kelly drive device 9 are respectively attached to a bottom expansion bucket (not shown) instead of the shaft excavation bucket 11 to expand the bottom of the vertical hole. Center joint and turntable used for The center joint 35 and the turntable 36 are supported and attached by pins 39 (see FIG. 7) provided on the frame 9a of the Kelly drive device.

  The expansion bucket has an expandable wing that can be opened and closed, and excavates the expanded bottom while gradually expanding the expansion wing. A hydraulic cylinder is used to open and close the expansion wing, and the opening and closing angle of the expansion wing There is a case in which a device for obtaining an electric signal such as a potentiometer for detecting the signal is mounted. Therefore, on the turntable 36, a hose reel 38 for winding and feeding a hose for supplying hydraulic fluid to the expansion blade opening / closing hydraulic cylinder, a cable reel 37 for winding and feeding a cable, and the like are mounted. On the other hand, the center joint 35 liquid-tightly fits a rotating part that rotates together with the turntable 36 and the kelly bar 10 in a non-rotating part to constitute a hydraulic fluid communication part. Communicate with the hose wound around. Further, the center joint 35 may have a function of connecting an electric circuit on the swing body 2 and a cable wound around the cable reel 37. In addition, a wireless device may be mounted on the turntable 36, and an electrical signal may be transmitted to or received from a wireless device installed on the revolving unit 2 or the like. Further, the rotating portion and the turntable 36 of the center joint 35 are rotated only when the bottomed bucket is used, and the rotating portion of the center joint 35 and the turntable 36 are not rotated when the shaft excavating bucket 11 is used. A clutch device may be provided. In addition, as a bucket, there is a bucket that does not replace the bucket with respect to the kelly bar 10 by giving the bottom-up bucket a function of an axial digging bucket.

  When shaft digging is performed by the shaft digging bucket 11 of this embodiment, as shown in FIG. 1, the undulation angle of the front frame 7 is adjusted by adjusting the degree of expansion and contraction of the front frame undulation cylinder 25, and the front frame 7 By adjusting the degree of expansion and contraction of the hydraulic cylinder 33 provided between the top and the frame 9a of the kelly drive device, the kelly bar 10 inserted through the hole of the rotary drive body of the kelly drive device 9 is made vertical, The rotary drive body is rotated by the operation of the hydraulic motor provided to rotate the bucket 11 together with the kelly bar 10, and excavation is performed while the main winding rope 14 is fed out by the operation of the main winding winch 12. At this time, the excavation efficiency can be increased by extending the hydraulic cylinder 34 and pressing the bucket 11 against the bottom surface of the vertical hole.

  When the earth and sand are filled in the bucket 11 by such excavation operation, the main winding winch 12 is operated in the winding direction to pull up the bucket 11 together with the kelly bar 10 to turn the revolving body 2 and open the bottom lid 11a. The earth and sand in the bucket 11 is discharged to the ground. Such work is repeated to excavate the vertical hole.

  On the other hand, when the auxiliary suspension work is performed, as shown in FIG. 2, the bucket 11 is removed from the kelly bar 10, the front frame hoisting cylinder 25 is contracted, and the front frame 7 is held on the boom 6 side. The work is performed in such a way that the Keriba 10 and the like do not interfere with the auxiliary suspension work.

  In this embodiment, since the boom 6 and the front frame 7 are pivotally mounted coaxially, even if the boom 6 is raised and lowered by the expansion and contraction of the boom raising and lowering cylinder 21 during auxiliary suspension work, the boom 6 and the front frame are supported. Since the relative position with respect to 7 does not change, there is no possibility that the boom 6 and the front frame 7 interfere with each other.

  In the present embodiment, the boom 6 and the front frame 7 are pivotally attached by the same pivot shaft 20 to prevent the boom 6 and the front frame 7 from interfering with each other. Thus, the detecting means, the interlocking circuit, or the interlocking cylinder for interlocking the boom and the front frame in the auxiliary suspension work is not required. In addition, the switching means for putting the interlocking circuit into an operating state or a non-operating state becomes unnecessary, and the problem of interference between the boom and the front frame can be solved with a simple structure. Further, the operation of the switching means becomes unnecessary, and a highly reliable earth drill can be provided in combination with the simplification of the structure.

  Further, since the boom 6 and the front frame 7 are supported by the revolving structure 2, the boom 6 can be reduced in weight as compared with the conventional ground drill in which the front frame is supported on the boom, and thus the lifting load can be reduced. And the stability can be improved.

  Further, in the present embodiment, the base end portion 7a of the front frame 7 is formed in a bifurcated shape so that the boom 6 is sandwiched from both sides by the base end portion 7a, so the boom itself is not modified from the conventional one. There is an advantage that it can be implemented.

  In the present embodiment, the hydraulic cylinder 33 for adjusting the inclination angle of the Kelly drive device is provided between the top of the front frame 7 and the frame 9a of the Kelly drive device. Compared to the case where the hydraulic cylinder is provided between the frame 9a of the drive device, the hydraulic cylinder 33 does not protrude to the boom 6 side, and the front frame 7 can be brought closer to the boom 6 side.

  FIG. 8 is a cross-sectional view corresponding to FIG. 4 showing another embodiment of the present invention. In this embodiment, the pivot shaft 41 of the boom 6 and the pivot shaft 42 of the front frame 7 are separated. Moreover, the 2nd bracket 44 which inserts the pivot shaft 42 of the front frame 7 is provided in the both sides of a pair of 1st bracket 43 which inserts the pivot shaft 41 of the boom 6, respectively. The pivot shaft insertion hole 44 a of the second bracket 44 is coaxial with the pivot shaft insertion hole 43 a of the first bracket 43. The pivot attachment shaft insertion hole 44 a of the second bracket 44 is formed larger than the pivot attachment shaft insertion hole 43 a of the first bracket 43.

  In the embodiment of FIG. 8, the foot portion of the boom 6 is set between the pair of first brackets 43 on the center side, and the boom is pivotally attached from the pivot attachment shaft insertion hole 44a of one second bracket 44. The boom 6 is pivotally attached to the first bracket 43 by being inserted into the pivot attachment shaft insertion hole 43 a of the first bracket 43 and the hole 6 a of the boss 6 b fixed to the boom foot portion through the pivot attachment shaft 41. Thereafter, the foot portion of the front frame 7 is set on each second bracket 44 on both sides of the boom 6, and the pivot shaft 42 of the front frame 7 is connected to the pivot shaft insertion hole 44 a of the second bracket 44 and the front frame 7. The front frame 7 can be pivotally attached to the second bracket 44 through the hole 7c of the foot portion. A flange (or cylindrical body) 6c is fixed to the end of the boss 6b. Bolts 45 are inserted into holes formed in the flange (or cylindrical body) 6c and the pivot shaft 41, respectively. By screwing and fastening 46, the boss 6b (boom 6) and the pivot shaft 41 are prevented from rotating, and relative movement in the axial direction is prevented.

  Thus, in this embodiment, since the front frame 7 can be pivotally attached after the boom 6 is pivotally attached, the holes 6a and 7c of the respective foot portions are simultaneously positioned in the pivot attachment shaft insertion holes of the brackets. There is no need to match, and the pivoting operation of the boom 6 and the front frame 7 becomes easy. Further, since the pivot shaft insertion hole 44a of the second bracket 44 is made larger than the pivot shaft insertion hole 43a of the first bracket 43, the boom to the pivot shaft insertion hole 43a of the first bracket 43 is increased. The pivot shaft 41 can be easily inserted through the pivot shaft insertion hole 44 a of the second bracket 44.

  When the present invention is carried out, as a means for raising and lowering the front frame 7, a wire rope drawn and fed by a hydraulic cylinder or a winch and hung between the boom 6 and the front frame 7 can be used. The present invention can also be applied to an earth drill using a winch as means for raising and lowering the boom 6. In addition, excavation work may be performed by attaching an excavation tool other than the earth drill bucket to the kelly bar 10.

It is a side view showing one embodiment of the earth drill of the present invention by composition for excavation. It is a side view which shows the earth drill of FIG. 1 by the structure for auxiliary | assistant suspension work. It is a principal part enlarged side view of this Embodiment. It is a longitudinal cross-sectional view which shows the boom and the pivotal attachment part of a front frame of this Embodiment. It is a longitudinal cross-sectional view which shows the structure of the boom side connection part of the front frame hoisting cylinder of this Embodiment. It is a longitudinal cross-sectional view which shows the structure of the front frame side connection part of the front frame hoisting cylinder of this Embodiment. It is a cross-sectional view which shows the attachment structure with respect to the front frame of the kelly drive apparatus of this Embodiment. It is a longitudinal cross-sectional view which shows other embodiment of the pivot attachment structure of the boom and front frame of this invention.

Explanation of symbols

1: traveling body, 2: turning body, 3: turning device, 4: power unit, 5: cab, 6: boom, 6a: hole, 7: front frame, 7a: base end, 7b :, 7c: hole, 9: Kelly drive device, 9a: Frame, 9b: Guide strut, 10: Kelly bar, 11: Earth drill bucket, 12: Main winding winch, 13: Supplement winding winch, 14: Main winding rope, 15: Supplement winding rope, 16 18: Sheave, 17: Swivel joint, 19: Object, 20: Pivoting shaft, 21: Boom hoisting cylinder, 25: Front frame hoisting cylinder, 33: Frame rotating cylinder, 34: Kelly drive device vertical moving cylinder, 35: Center joint, 36: Turntable, 37: Hose reel, 38: Cable reel, 41, 42: Pivoting shaft, 43: First bracket, 43 : Pivot shaft insertion hole, 44: second bracket, 44a: pivot shaft insertion hole

Claims (4)

A boom attached to a swinging body installed on the traveling body so as to be able to undulate,
A front frame with the frame of the Kelly drive device attached to the top;
A kelly bar penetrating the rotary drive body of the kelly drive device and attaching a drilling tool to the lower end;
A main winding winch and an auxiliary winch mounted on the revolving structure,
A main winding rope wound and fed by the main winding winch is suspended from the top of the boom and connected to a kelly bar via a swivel joint,
Auxiliary winding rope wound down by the auxiliary winch is suspended from the top of the boom to perform auxiliary suspension work,
In the arm drill that embraces the front frame to the boom side during the auxiliary suspension work,
An earth drill, characterized in that the front frame is attached to be pivotable coaxially with a pivot shaft of the boom. The earth drill according to claim 1,
The ground drill is characterized in that the front frame is formed in a bifurcated shape so that a base end portion sandwiches the boom from both sides. In the earth drill according to claim 1 or 2,
An earth drill characterized in that a hydraulic cylinder is provided between the top of the front frame and the frame of the kelly drive device to rotate the frame of the kelly drive device relative to the front frame. In the earth drill in any one of Claim 1 to 3,
The boom pivot shaft and the front frame pivot shaft are separated,
The second bracket for inserting the pivot shaft of the front frame is provided on both sides of the pair of first brackets for inserting the pivot shaft of the boom,
The pivot mounting shaft insertion hole of the second bracket is coaxial with the pivot mounting shaft insertion hole of the first bracket and is larger than the pivot mounting shaft insertion hole of the first bracket. Earth drill to do.

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