Locking mechanism for auger device, excavation device, and attachment replacement method for excavation device

Abstract

To significantly improve safety and work efficiency by automating replacement of an attachment on an auger device and eliminating the need for work at height.SOLUTION: A locking mechanism for an auger device is used in pile driving and ground improvement work, etc., and includes a first engaging member attached to a lower end of the auger device located at height, a second engaging member that engages with the first engaging member, and a locking mechanism that maintains the first and second engaging members engaged. The first engaging member has a first locking hole. The second engaging member has a second locking hole that communicates with the first locking hole when the first and second engaging members are engaged. The locking mechanism includes a locking pin that is inserted into the communicating first and second locking holes, and, when the first and second engaging members are engaged, presses the locking pin to insert the locking pin into the first and second locking holes.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a construction machine used in excavation work, and more particularly to a technique for fixing (locking) an attachment attached to an auger device. [Background technology]

[0002] Traditionally, at construction sites, excavation work involves digging the ground, driving piles, and carrying out ground improvement work. Rotary heavy machinery known as an auger is used to excavate the ground. The auger has various attachments attached to its tip for excavation.

[0003] The attachments include those designed for excavating the ground, those for breaking up hard rock or concrete, and those for delivering coagulants, and are interchangeably attached to the auger unit depending on the application.

[0004] For example, there is an invention relating to a tool conversion jig for a soil improvement machine that can be converted from a soil improvement tool to an obstacle removal tool (see Patent Document 1). This tool conversion jig makes it possible to convert from a soil improvement tool to an obstacle removal tool, thereby improving work efficiency.

[0005] The tool conversion jig also has a reinforcing member that is integrated with the main body, which increases the pressing force and accommodates tools with a large diameter. The hollow rod can be extended through the hollow portion, promoting the standardization of parts, and providing a tool conversion jig that can be used in a variety of ways. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-11444 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in conventional attachment replacement, the attachment is attached and fixed to the auger device while it is erected on the ground, so the auger device is basically placed at a high location and attached and fixed at a high location.

[0008] Therefore, when changing attachments, workers must work at high altitudes, posing a major safety concern. Furthermore, manual replacement takes time, which reduces work efficiency.

[0009] The present invention has been proposed to solve the above problems, and aims to greatly improve safety and work efficiency by automating the replacement of excavation tools in an auger unit and eliminating the need for work at heights. [Means for solving the problem]

[0010] (1) In order to solve the above problem, the locking mechanism of the auger assembly of the present invention is used in ground improvement work, etc., and comprises a first engaging member provided at the lower end of an auger assembly located at a high altitude, a second engaging member that engages with the first engaging member, and a locking mechanism that maintains the first engaging member and the second engaging member engaged, wherein the first engaging member has a first locking hole, and the second engaging member has a second locking hole that communicates with the first locking hole when the first engaging member and the second engaging member are engaged, and the locking mechanism is characterized in that it includes a locking pin that is inserted into the communicating first locking hole and the second locking hole, and when the first engaging member and the second engaging member are engaged, it presses the locking pin to insert it into the first locking hole and the second locking hole.

[0011] This locking mechanism for the auger device is located at the lower end of the auger device, which is easily accessible from the ground, and an attachment is attached using a first fitting member and a second fitting member.The locking mechanism allows the first fitting member and the second fitting member to be quickly secured or released.

[0012] The locking mechanism automates the locking process, which was previously performed manually. This eliminates the dangerous and labor-intensive manual work required at high altitudes when changing attachments, significantly improving worker safety and work efficiency, thereby reducing overall project time and costs.

[0013] (2) In the locking mechanism of the auger device described above, the first engaging member has a pair of the locking holes, and the second engaging member has second locking holes that communicate with each of the first locking holes when the first engaging member and the second engaging member are engaged with each other.

[0014] According to the locking mechanism of this auger device, a pair of lock pins are passed through a pair of lock holes and fixed, thereby enabling the first fitting member and the second fitting member to be reliably fixed in a fitted state.

[0015] (3) The locking mechanism of the above-mentioned auger device further includes a pair of the locking mechanisms, each of which includes a cylinder fixed to the first engaging member or the second engaging member and pressing the locking pin from the second locking hole to the first locking hole.

[0016] According to this auger gear locking mechanism, each locking mechanism in the pair is operated by an independent cylinder. The cylinder presses the lock pin from the second locking hole to the first locking hole, thereby quickly and reliably locking and releasing the attachment. This improves the stability and fixing strength of the attachment connection, reduces the risk of the attachment shifting or falling off during excavation work, and further enhances the reliability and safety of work.

[0017] (4) In the locking mechanism of the auger device described above, the cylinder is configured to expand and contract in a direction perpendicular to the insertion and removal direction of the lock pin, and is equipped with a pressure direction conversion mechanism that inserts and removes the lock pin by expanding and contracting the cylinder.

[0018] According to this locking mechanism for an auger device, the cylinder expands and contracts in a direction perpendicular to the direction in which the lock pin is inserted and removed, thereby changing the direction of the cylinder's pressing force. This structure converts the cylinder's movement into a force that efficiently pushes or pulls the lock pin. This direction-changing mechanism allows the lock pin to be inserted and removed smoothly and quickly, even when the cylinder is positioned perpendicular to the direction in which the lock pin is inserted and removed, thereby increasing the flexibility of cylinder placement.

[0019] (5) In the locking mechanism of the auger device described above, each pressing force direction conversion mechanism includes a first displacement member connected to the tip of the cylinder and displaceable in the vertical direction, a second displacement member connected to the tip of the cylinder and the first displacement member and displaceable laterally outward, and a third displacement member connected at its base end to the tip of the cylinder, the first displacement member, and the second displacement member and connected at its tip to the lock pin and displaceable laterally inward, the first displacement member having a circular hole with a cross section, the second displacement member having a circular hole with a cross section located at the center in the horizontal direction and an elongated hole located on the outside, the third displacement member having circular holes on the base end side and the tip end side, the circular holes of the first displacement member, the second displacement member, and the third displacement member are rotatably supported by an axis member, and the cylinder presses the first displacement member downward, causing the third displacement member to press the lock pin provided at its tip.

[0020] This locking mechanism for an auger machine converts the linear motion of a cylinder into the insertion and extraction motion of a lock pin via multiple displacement members. The first displacement member receives vertical pressure from the cylinder, and this force is efficiently converted into lateral movement via the second and third displacement members. This locking mechanism allows for direct application of force to the lock pin, improving the reaction speed and accuracy of the locking mechanism. Furthermore, the high efficiency of force transmission between components improves the overall reliability and durability of the machine, reducing maintenance costs and increasing the uptime of the auger machine.

[0021] (6) In the locking mechanism for the auger device described above, the pair of pressing force direction changing mechanisms are connected to the first fitting member. According to this locking mechanism for the auger device, the pressing force direction changing mechanisms are connected to the first fitting member connected to the auger device, so the pressing force direction changing mechanisms can be moved simultaneously with the auger mechanism, improving the efficiency of excavation work.

[0022] (7) The locking mechanism of the auger device described above further includes a pair of the locking mechanisms, each of which is fixed to the first engaging member or the second engaging member and includes an elastic mechanism that elastically presses the locking pin from the second locking hole to the first locking hole, and the locking pin is inserted into the elastic mechanism while the first locking hole and the second locking hole are connected to each other.

[0023] This auger gear locking mechanism, in which a pair of locking mechanisms are fixed to corresponding fittings and the lock pin is pressed via an elastic mechanism, allows attachment replacement and fixing to be performed more quickly and reliably. This elastic mechanism allows the lock pin to be automatically and elastically inserted between the first and second locking holes, eliminating the need for manual adjustment work and improving work efficiency.

[0024] This system also enables precise positioning of the locking pin, preventing the attachment from accidentally falling off during excavation, improving work safety. Furthermore, the mechanism also ensures that the attachment remains securely fixed even during continuous work, improving the reliability and durability of the equipment.

[0025] (8) In the locking mechanism for the auger device described above, the second fitting member is rotated by 90 degrees relative to the first fitting member, so that the second locking hole communicates with the first locking hole.

[0026] This auger equipment locking mechanism allows for quick and easy attachment replacement and locking, as the first and second locking holes are connected by rotating the second mating member 90 degrees relative to the first mating member. This rotation mechanism significantly improves work efficiency by simplifying the insertion of the locking pin without manual operation or additional tools. The direct connection achieved by the rotational action also enhances the stability of the lock, minimizing the risk of attachment misalignment or disengagement. This improves the safety and reliability of excavation operations, contributing to time and cost savings on the job site.

[0027] (9) In the locking mechanism for the auger unit described above, the second fitting member rotates 90 degrees relative to the first fitting member as it rises as the auger unit rises. This locking mechanism for the auger unit automates the process of automatically aligning the second fitting member with the first fitting member and inserting the lock pin into the correct position. This allows attachments to be quickly and easily locked and released, facilitating attachment changes even while excavation work is in progress.

[0028] (10) The excavation equipment according to the present invention secures the auger unit and the attachment using the locking mechanism described above. This excavation equipment allows for quick and easy attachment replacement and adjustment, significantly improving work efficiency. Furthermore, the secure fixation provided by the locking mechanism maintains the stability of the attachment during excavation work and prevents unexpected detachment or movement, thereby enhancing work safety. Thus, the use of the locking mechanism improves the operability, efficiency, and safety of the excavation equipment, enhancing reliability and productivity at the work site.

[0029] (11) The method for replacing an attachment for a drilling device according to the present invention utilizes the drilling device, wherein the second engaging member is connected to an attachment, the attachment is attached to the auger device by connecting the second engaging member to the first engaging member, and the attachment is fixed by the locking mechanism so that it does not come off the auger device.

[0030] According to this method for replacing an attachment for an excavating machine, the attachment is securely fixed by a locking mechanism, which significantly reduces the risk of the attachment coming off the auger device during excavation. This method allows attachments to be attached and removed easily and quickly, significantly improving work efficiency. Furthermore, secure attachment fixation improves the safety and accuracy of excavation work and maintains the reliability of the equipment. This reduces work downtime and improves productivity. [Effects of the Invention]

[0031] According to the present invention, by automating the locking work for attachment replacement, which requires work at height, manual work at height is no longer necessary, thereby improving worker safety and efficiency and reducing work time and costs. [Brief explanation of the drawings]

[0032] [Figure 1] 1 is a side view showing an excavation device according to a first embodiment of the present invention. [Figure 2] 2A to 2C are diagrams showing a connection device provided on the excavation equipment shown in FIG. 1, in which (A) is a plan view, (B) is a front cross-sectional view, and (C) is a bottom view. [Figure 3] 2A to 2C are diagrams showing an attachment attached to the auger device shown in FIG. 1, in which (A) is a plan view, (B) is a front cross-sectional view, and (C) is a bottom view. [Figure 4] 3 is an exploded front view showing a pressing force conversion mechanism of the connection device shown in FIG. 2. FIG. [Figure 5]3A and 3B are front cross-sectional views illustrating the operation of the locking mechanism of the connection device shown in FIG. 2, in which (A) shows the state before locking, and (B) shows the state after locking. [Figure 6] FIG. 4 is a side view showing an excavation device according to a second embodiment of the present invention. [Figure 7] 7A and 7B are diagrams showing a connection device provided on the excavation equipment shown in FIG. 6, in which (A) is a side view and (B) is a front view. [Figure 8] 6A and 6B are diagrams for explaining the operation of the locking mechanism of the connection device shown in FIG. 5, in which (A) shows a state before locking, and (B) is a front cross-sectional view showing a state after locking. DETAILED DESCRIPTION OF THE INVENTION

[0033] Hereinafter, an excavation device S according to an embodiment of the present invention will be described with reference to the drawings. In this embodiment, the up-down direction on the paper surface in Figures 1 and 6 will also be referred to as the "up-down direction" or "axial direction," the left-right direction on the paper surface in Figures 1 and 6 will also be referred to as the "front-rear direction," and the direction towards the back of the paper surface will also be referred to as the "lateral direction." In particular, the lower side of the up-down direction will also be referred to as the tip direction, and the upper side will also be referred to as the base direction.

[0034] The excavation device includes a base machine such as a backhoe or pile driver, an auger device attached to the tip of the leader of the base machine, an attachment attached to the auger device, and a connection mechanism that connects the auger device and the attachment. Various attachments or the same type of attachments can be interchangeably attached to the auger device. In this embodiment, a form in which an excavation attachment for excavating the ground is attached will be described. However, the attachment may be another attachment suitable for other uses.

[0035] [First embodiment] 1, an excavation rig S1 according to a first embodiment of the present invention is used for excavation work in an environment with headroom restrictions, such as an overpass. The excavation rig S1 includes a base machine S11, an auger device S12 attached to the tip of a leader of the base machine S11, an attachment S13 provided at the tip of the auger device S12, and a connection mechanism S14 that interchangeably connects the attachment S13 to the auger device S12.

[0036] In the first embodiment, since there is a headroom limit, the excavation device S1 uses a relatively small base machine as the base machine S11, and excavation is performed with the first attachment S13. With the attachment S13 buried in the ground, the base end of the second attachment S13 is replaced and attached to the auger device S12 of the base machine S11 via the connection mechanism S14, and the second attachment S13 is connected to the base end of the first attachment S13 to perform excavation to deepen the depth. Excavation is performed by sequentially adding attachments S13 until the desired depth is reached.

[0037] The connection mechanism S14 is formed from a first connection part 10 provided at the tip of the auger device S12 and a second connection part 20 provided at the base end of the attachment S13 so that the attachment S13 can be easily connected to the auger device S12. The attachment S13 is attached to the auger device S12 by connecting the second connection part 20 to the first connection part 10. Metal materials suited to the function are used for the materials of each part of the connection mechanism S14.

[0038] As shown in FIG. 2, the first connecting portion 10 is connected to the auger device S12 and includes a support portion 12 that supports and fixes the first engaging member 11, the first engaging member 11 supported by the support portion 12, and a locking mechanism 13 that locks the first engaging member 11 and the second engaging member 21 when the second engaging member 21 described below is engaged with the first engaging member 11.

[0039] The support unit 12 generally comprises a first disk member 14 and a second disk member 15 placed on the first disk member 14. The first disk member 14 is fixed to the auger device S12 by bolts B passing through its periphery. The second disk member 15 is connected to the first disk member 14 by a connecting member 16 in the center.

[0040] The first fitting member 11 is formed in a roughly cylindrical shape and has a blind hole 11a with a hexagonal cross section that extends in the axial direction formed in the center. The first fitting member 11 is fixed to the first disk member 14 by welding. The first fitting member 11 has a pair of first lock holes 11b on one opposing surface, through which a lock pin 35 (described later) is inserted laterally.

[0041] 3, the second fitting member 21 has a hexagonal connecting shaft portion 21a that corresponds to the hexagonal connecting hole of the first fitting member 11, and an attachment portion 23 that extends from the connecting shaft portion 21a. The connecting shaft portion 21a has a pair of second locking holes 21b that receive locking pins 35, which will be described later, that open outward in the lateral direction. Although not shown, the attachment portion 23 may be formed in various shapes depending on the use of the attachment S13 that includes the second fitting member 21.

[0042] 2, the locking mechanism 13 includes a base member 31 connected to the tip of the first fitting member 11, a pair of cylinder support parts 32 connected to both lateral sides of the base member 31, a cylinder 33 supported by the cylinder support parts 32, a pressing force direction converting mechanism 34 connected to the telescopic tip of the cylinder 33, and a lock pin 35 that is pressed by converting the pressing force of the cylinder 33, which telescopically extends in the axial direction, into a lateral direction by the pressing force direction converting mechanism 34. The lock pin 35 is formed in a generally plate shape, and the tip portion facing the first lock hole 11b is formed in a semicircular cross section in a front view, the first lock hole 11b is formed in a shape corresponding to the tip portion of the lock pin 35, and the second lock hole 21b is formed in a generally rectangular cross section.

[0043] The base member 31 has a circular central portion 31c and side portions 31b extending laterally from the central portion 31c (see FIG. 2(C)). The central portion 31c has a through hole 31a with the same cross section as the blind hole 11a of the first fitting member 11. With the blind hole 11a and the through hole 31a communicating with each other, a bolt B is passed through the periphery of the central portion 31c to connect the base member 31 to the first fitting member 11. In this embodiment, the hole formed by the through hole 31a and the blind hole 11a is referred to as the first connecting hole. As a result, the first connecting hole is a blind hole with a hexagonal cross section.

[0044] The cylinder support portion 32 includes a first support portion 12 extending in the axial direction from the lateral ends of both side portions 31b of the base member 31, and a second support portion 22 placed on the base end of the first support portion 12 and fixed by welding, and the first support portion 12 is connected to the ends of both side portions 31b of the base member 31 through bolts B (see FIG. 2(B)). The second support portion 22 has an axial through-hole (not shown), and the telescopic portion 33a of the cylinder 33 is inserted into the through-hole, so that the cylinder 33 is placed on it.

[0045] The pressing force direction converting mechanism 34 includes a first displacement member 34a connected to the tip of the cylinder 33 and displaceable in the up-down direction, a second displacement member 34b connected to the first displacement member 34a and displaceable outward in the lateral direction, and a third displacement member 34c connected to the first displacement member 34a and displaceable inward in the lateral direction. Each displacement member is made up of a pair of plate-like members spaced apart in the front-to-rear direction, which is perpendicular to the lateral direction.

[0046] 4, first displacement members 34a have first circular holes 34o with a circular cross section provided in each plate-shaped member, second displacement members 34b have second circular holes 34p with a circular cross section provided in each plate-shaped member and located toward the horizontal center, and elongated holes 34q located on the horizontal outer sides, and third displacement members 34c have third circular holes 34r with a circular cross section provided in each plate-shaped member and located toward the horizontal outer sides, and fourth circular holes 34s with a circular cross section located toward the horizontal center. First circular hole 34o to fourth circular holes 34s and elongated holes 34q penetrate each plate-shaped member of each displacement member.

[0047] 5, a first shaft member 34u is passed through a first circular hole 34o of the first displacement member 34a, a second circular hole 34p of the second displacement member 34b, and a third circular hole 34r of the third member, and these members are rotatably connected. Furthermore, a second shaft member 34v provided on the first support portion 12 of the cylinder support portion 32 is rotatably passed through an elongated hole 34q of the second displacement member 34b and connected to the lock pin 35. Furthermore, a third shaft member 34w is passed through a fourth circular hole 34s of the third displacement member 34c, and the third displacement member 34c is rotatably connected to the lock pin 35.

[0048] As the cylinder 33 expands and contracts in the vertical direction, the first displacement member 34a is displaced up and down, and in conjunction with this, the second displacement member 34b and the third displacement member 34c are displaced, and the lock pin 35 is displaced laterally. Specifically, when the expansion and contraction portion 33a of the cylinder 33 is positioned upward, the first displacement member 34a rises, and the center side of the second displacement member 34b and the outer side of the third displacement member 34c are positioned upward, resulting in an oblique state in which the center side of the second displacement member 34b is higher, and the outer side of the third displacement member 34c is higher (see FIG. 5(A)).

[0049] When the tip of the cylinder 33 is in the lower position, the first displacement member 34a descends, and the second displacement member 34b and the third displacement member 34c are horizontal. When the telescopic member of the cylinder 33 moves from the upper position to the lower position, the elongated hole 34q of the second displacement member 34b shifts from a position in which the second shaft member 34v is supported on the outside to a position in which the second shaft member 34v is supported on the inside. When the second shaft member 34v is positioned at the innermost position of the elongated hole 34q, the second displacement member 34b is horizontal. At this time, the third circular hole 34r of the third displacement member 34c is pivotally engaged with the second circular hole 34p of the second displacement member 34b, so the third displacement member 34c is horizontal, with the fourth circular hole 34s displaced toward the center. This causes the third displacement member 34c to displace inward, pressing the lock pin 35 (see FIG. 5B).

[0050] In the excavation rig S1, when the first fitting member 11 and the second fitting member 21 are fitted together, the first lock hole 11b of the first fitting member 11 and the second lock hole 21b of the second fitting member 21 communicate with each other, and the cylinder 33 of the lock mechanism 30 operates so that the lock pin 35 is inserted into the first lock hole 11b and the second lock hole 21b, thereby locking the first fitting member 11 and the second fitting member 21. The pair of cylinders 33 may operate individually or simultaneously.

[0051] The excavation rig S1 performs excavation with a first excavation attachment S13 attached to the auger unit S12, and then the attachment S13 is replaced with a second excavation attachment S13 while the attachment S13 is buried underground. At this time, the attachment S13 is replaced with the second attachment S13 while the connection mechanism S14 is at a high altitude, and the mechanism that connects and locks the attachment S13 to the auger unit S12 is automatically locked by the cylinder 33. The excavation rig S1 requires frequent replacement of the attachments S13, but in this embodiment, replacement of the attachment S13 is easy and safe, thereby improving the efficiency of excavation work.

[0052] In the first embodiment of the present invention, the locking mechanism has been described as having a cylinder that expands and contracts vertically and presses the lock pin laterally via a pressing force conversion mechanism. However, the locking mechanism may have a cylinder that expands and contracts horizontally and presses the lock pin laterally.

[0053] In the first embodiment of the present invention, the locking mechanism has been described as converting the pressing force of the cylinder using the first displacement member, the second displacement member, and the third displacement member. However, the locking mechanism may convert the pressing force using other configurations.

[0054] [Second embodiment] A drilling rig S2 according to a second embodiment of the present invention is used, for example, for excavating work when constructing prefabricated foundation piles in the ground to support large structures such as buildings, roads, railways, bridges, etc. The drilling rig S2 includes a base machine S21, an auger device S22 attached to the tip of a leader of the base machine S21, an attachment S23 provided at the tip of the auger device S22, and a connection mechanism S24 that interchangeably connects the attachment S23 to the auger device S22.

[0055] As shown in Fig. 6, in the second embodiment, the excavation equipment S2 uses a large pile driver as a base machine S21, and a long attachment S23 corresponding to the target excavation depth is replaceably attached to the auger device S22 of the base machine S21 via a connection mechanism S24. The excavation equipment S2 excavates to the target depth in a single excavation operation, so the attachment is long, and the connection mechanism S24 is in a high position when replacing the attachment.

[0056] The connection mechanism S24 is formed by a first connection part 60 provided at the tip of the auger device S22 and a second connection part 70 provided at the base end of the attachment S23 so that the attachment S23 can be easily connected to the auger device S22. The attachment S23 is attached to the auger device S22 by connecting the second connection part 70 to the first connection part 60. Each part of the connection mechanism S24 is made of a metal material suited to its function.

[0057] As shown in FIG. 7, the first connection portion 60 includes an extending support member 62 connected to the auger device S22, a first engaging member 61 fixedly supported by the extending support member 62, and a locking mechanism 80 that locks the first engaging member 61 and the second engaging member 71 when the second engaging member 71 described below is engaged with the first engaging member 61.

[0058] The first fitting member 61 generally comprises a base end disc member 61a that forms the base end of the first fitting member 61, and a tip rod-shaped member 61b that extends axially from the base end disc member 61a. The tip circular base plate 62a and the base end disc member 61a are fixed to each other at their peripheries by bolts B. The base end disc member 61a and the tip rod-shaped member 61b are also fixed by welding and are firmly fixed by an auxiliary member. The tip rod-shaped member 61b has a first locking hole 61c that penetrates laterally and an axial hole 61d that is adjacent to and below the first locking hole 61c.

[0059] The second fitting member 71 includes a rotation receiving portion 71a that rotatably receives the tip rod-shaped member 61b, an extending support member 72 extending from the rotation receiving portion 71a, and an attachment receiving portion 73 that receives an attachment S23 that connects to the tip of the extending support member 72. The rotation receiving portion 71a is formed in a U-shape when viewed from the front, and has a pair of second locking holes 71c that penetrate both sides of the U-shape, and a pair of second axial holes 71d that are adjacent to and below the pair of locking holes 71c. The rotation receiving portion 71a is connected to the extending support member 72 by welding to the lower end of the U-shape.

[0060] The rotation receiving portion 71a of the second fitting member 71 is rotatably coupled to the first fitting member 61 with the shaft portion 73d passing through the shaft hole 61d and the pair of shaft holes 71d in a state where the pair of shaft holes 71d of the second fitting member 71 communicate with the shaft hole 61d of the tip rod-shaped member 61b of the first fitting member 61. The first lock hole 61c of the first fitting member 61 and the pair of second lock holes 71c of the second fitting member 71 communicate with each other when the first fitting member 61 and the second fitting member 71 are aligned in the up-down direction, and a lock pin 85 is inserted through the holes, but are misaligned in other states so that the lock pin 85 cannot be inserted.

[0061] The locking mechanism 80 includes a pair of locking pins 85 inserted into a pair of second locking holes 71c of the rotation receiving portion 71a, and a pair of elastic portions 86 that press the locking pins 85 toward the center. Each elastic portion 86 is connected to the rotation receiving portion 71a, and the locking pin 85 is connected to the elastic portion 86. The locking pin 85 is inserted into both side portions 71d of the rotation receiving portion 71a and is pressed by the elastic portions 86 toward the through-hole of the tip rod-shaped member 61b.

[0062] The drilling rig S2 is assembled such that the tip rod-shaped member 61b of the first fitting member 61 and the extending support member 62 of the second fitting member 71 are aligned in the vertical direction, the pair of first lock holes 61c of the first fitting member 61 and the pair of second lock holes 72c of the second fitting member 71 are in communication with each other, and the elastic portion 86 of the locking mechanism 80 presses the pair of lock pins 85 toward the center. With the first lock hole 61c and the pair of second lock holes 72c in communication with each other, the lock pin 85 is passed through the first lock hole 61c and the pair of second lock holes 72c, thereby locking the first fitting member 61 and the second fitting member 71 together.

[0063] As shown in Figure 8(A), when attaching the attachment S23 to the excavation device S2, the auger device S22 is lowered so that the lower end of the first fitting member 61 extending in the vertical direction is in contact with or close to the ground, and the second fitting member 71 is attached with the second fitting member 71 aligned horizontally. When the auger device S22 is then raised, the first fitting member 61 also rises, as shown in Figure 8(B), and one end of the second fitting member 71 is lifted as the first fitting member 61 rises. When the second fitting member 71 is then lifted until it is aligned vertically, the lock pin 85 is passed through the through hole and the pair of through holes with the through hole and the pair of through holes communicating, and the first fitting member 61 and the second fitting member 71 are locked together.

[0064] In the method for replacing an attachment for an excavating device, the attachment is fixed to the auger device by the locking mechanism according to the first embodiment or the locking mechanism according to the second embodiment.

[0065] In the second embodiment of the present invention, the locking mechanism has been described as having a configuration in which the first locking hole and the second locking hole communicate with each other when the second fitting member rotates 90 degrees relative to the first fitting member. However, the locking mechanism may have other configurations as long as the first locking hole and the second locking hole communicate with each other when the second fitting member rotates relative to the first fitting member.

[0066] In the embodiments of the present invention, the locking mechanism has been described as having a configuration in which a cylinder or an elastic portion presses a lock pin to automatically fix (lock) the first fitting member and the second fitting member together. However, the locking mechanism may be configured to automatically fix (lock) the first fitting member and the second fitting member together using another mechanism.

[0067] In the embodiments of the present invention, the locking mechanism has been described as having a pair of cylinders or a pair of elastic portions each pressing a lock pin to fix (lock) the first fitting member and the second fitting member. However, the locking mechanism may have a configuration in which one cylinder or one elastic portion presses one lock pin to fix (lock) them.

[0068] The above describes the excavation rig, the locking mechanism for the excavation rig, and the attachment changing method for the excavation rig according to the embodiments of the present invention. However, the excavation rig, the locking mechanism for the excavation rig, and the attachment changing method for the excavation rig are not limited to the above embodiments, and other configurations may be used as long as the object of the invention is achieved. [Industrial Applicability]

[0069] The present invention can be used to remove buried piles. [Explanation of symbols]

[0070] B: Bolt S: Drilling equipment S1: Drilling equipment S11: Base machine S12: Auger device S13: Attachment S14: Connection mechanism S2: Drilling equipment S21: Base machine S22: Auger device S23: Attachment S24: Connection mechanism 10: First connection part 11: First fitting member 11a: Hole 11b: First lock hole 12: Support part 13: Locking mechanism 14: First disc member 15: Second disc member 16: Connecting member 20: Second connection part 21: Second fitting member 21a: connecting shaft 21b: Second lock hole 22: Second support part 23: Attachment part 30: Locking mechanism 31: Substrate material 31a: Hole 31b: Both sides 31c: central part 32: Cylinder support 33: Cylinder 33a: Telescopic part 34: Pressure direction conversion mechanism 34a: First displacement member 34b: Second displacement member 34c: Third displacement member 34o: First circular foramen 34p: Second circular foramen 34q: long hole 34r: Third circular foramen 34s: 4th circular hole 34u: First shaft member 34v: Second shaft member 34w: Third shaft member 35: Lock pin 60: First connection part 61: First fitting member 61a: Proximal disc member 61b: Tip rod member 61c: First lock hole 61d: Shaft hole 62: Extended support member 62a: Tip circular substrate 70: Second connection part 71: Second fitting member 71a: Rotation receiving part 71c: Second lock hole 71d: Shaft hole 72: Extended support member 72c: Second lock hole 73d: Shaft 80: Locking mechanism 85: Lock pin 86: Elastic part

Claims

1. a first fitting member provided at the lower end of an auger device that is used for pile driving, ground improvement work, etc. and is located at a high altitude; a second fitting member that fits into the first fitting member; a locking mechanism that maintains the first fitting member and the second fitting member in a fitted state, the first fitting member has a first lock hole; the second fitting member has a second lock hole that communicates with the first lock hole when the first fitting member and the second fitting member are fitted together, The locking mechanism of an auger device is characterized in that the locking mechanism includes a lock pin that is inserted into the first lock hole and the second lock hole that are connected to each other, and the lock pin is pressed and inserted into the first lock hole and the second lock hole when the first engaging member and the second engaging member are engaged with each other.

2. the first fitting member has a pair of the lock holes, 2. The locking mechanism for an auger device according to claim 1, wherein the second fitting member has second locking holes that communicate with the first locking holes when the first fitting member and the second fitting member are fitted together.

3. Further, a pair of the locking mechanisms is provided, The locking mechanism of claim 2, wherein each locking mechanism includes a cylinder fixed to the first fitting member or the second fitting member and pressing the locking pin from the second locking hole to the first locking hole.

4. the cylinder is provided so as to extend and contract in a direction perpendicular to the insertion and removal direction of the lock pin, The locking mechanism for an auger device according to claim 3, further comprising a pressing force direction changing mechanism that inserts and removes the lock pin by extending and contracting the cylinder.

5. Each pressing force direction conversion mechanism is a first displacement member connected to the tip of the cylinder and capable of being displaced in the up and down direction; a second displacement member connected to the tip of the cylinder and the first displacement member and displaceable laterally outward; a third displacement member, the third displacement member having a base end connected to the tip of the cylinder, the first displacement member, and the second displacement member, and a tip end connected to the lock pin, the third displacement member being displaceable inward in the lateral direction; the first displacement member has a circular hole having a circular cross section, the second displacement member has a circular hole with a circular cross section located on the lateral center side and an elongated hole located on the outer side, the third displacement member has a perfect circular hole on a base end side and a tip end side, the circular hole of the first displacement member, the circular hole of the second displacement member, and the third displacement member are rotatably supported by a shaft member; 5. The locking mechanism according to claim 4, wherein the cylinder presses the first displacement member downward, causing the third displacement member to press the lock pin provided at the tip thereof.

6. The locking mechanism according to claim 5 , wherein the pair of pressure direction changing mechanisms are connected to the first fitting member.

7. Further, a pair of the locking mechanisms is provided, each locking mechanism is fixed to the first fitting member or the second fitting member; an elastic mechanism that elastically presses the lock pin from the second lock hole to the first lock hole; The locking mechanism according to claim 2 , wherein the locking pin is inserted through the elastic mechanism in a state where the first locking hole and the second locking hole are in communication with each other.

8. The locking mechanism according to claim 7 , wherein the second fitting member rotates relative to the first fitting member, thereby causing the second locking hole to communicate with the first locking hole.

9. The locking mechanism according to claim 8 , wherein the second fitting member rotates relative to the first fitting member by rising as the auger device rises.

10. 2. An excavating rig, wherein the auger assembly and the attachment are secured by a locking mechanism as set forth in claim 1.

11. the second fitting member is connected to an attachment; The attachment is attached to the auger device by connecting the second fitting member to the first fitting member, A method for replacing an attachment on an excavating device, characterized in that the attachment is fixed by the locking mechanism so as not to be removed from the auger device.

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