JP7563816B1 - Locking mechanism for auger device, excavation device, and attachment replacement method for excavation device - Google Patents

Abstract

[Problem] To automate the replacement of attachments for an auger device and eliminate the need for work at height, thereby significantly improving safety and work efficiency.
[Solution] The locking mechanism of the auger unit is used for pile driving, ground improvement work, etc., and comprises a first engaging member provided at the lower end of the auger unit 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 in an engaged state, wherein the first engaging member has a first lock hole, and the second engaging member has a second lock hole that communicates with the first lock hole when the first engaging member and the second engaging member are engaged, and the locking mechanism comprises a lock pin that is inserted into the communicating first lock hole and second lock hole, and when the first engaging member and the second engaging member are engaged, the lock pin is pressed to insert it into the first lock hole and the second lock hole.
[Selected figure] Figure 4

Description

The present invention relates to construction machinery and equipment used in excavation work, and in particular to technology for fixing (locking) attachments attached to an auger device.

Traditionally, excavation work at construction sites involves digging the ground and driving piles into the ground, or carrying out ground improvement work. In such excavation work, a rotary heavy machine called an auger unit is used to excavate the ground. The auger unit has various attachments attached to its tip when excavating.

These attachments are available in a variety of sizes, including those designed for excavating the ground, for breaking up hard rock and concrete, and for delivering coagulants, and are interchangeably attached to the auger unit depending on the application.

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

The tool conversion jig also has a reinforcing member that is integrated with the main body, which increases the pressing force to accommodate large diameter tools. The hollow rod can be extended through the hollow section, which promotes standardization of parts, providing a tool conversion jig that can be used in a variety of ways.

JP 2024-11444 A

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 position and attached and fixed at a high position.

As a result, changing attachments requires working at height, making worker safety a major issue. Furthermore, changing attachments manually takes time, which reduces work efficiency.

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 the excavation tools of the auger device and eliminating the need to work at height.

(1) In order to solve the above problems, the locking mechanism of the auger device according to the present invention is used in ground improvement work and the like, and includes a first fitting member provided at the lower end of the auger device located at a high position, a second fitting member that fits into the first fitting member, and a locking mechanism that maintains the first fitting member and the second fitting member in a fitted state, the first fitting member having a first locking hole, the second fitting member having a second locking hole that communicates with the first locking hole when the first fitting member and the second fitting member are fitted, 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 fitting member and the second fitting member are fitted, the locking pin is pressed to insert into the first locking hole and the second locking hole.

The locking mechanism of this 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 engaging member and a second engaging member, and the locking mechanism allows the first engaging member and the second engaging member to be quickly fixed or released.

The locking mechanism automates the locking process, which was previously performed manually. This eliminates the dangerous and labor-intensive manual work at height that was previously required when changing attachments, and completes the attachment change process. This significantly improves worker safety and improves work efficiency, resulting in overall project time and cost savings.

(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.

The locking mechanism of this auger device allows a pair of lock pins to be passed through a pair of lock holes and secured in place. This allows the first and second engaging members to be securely secured in an engaged state.

(3) The locking mechanism of the auger device described above further includes a pair of the locking mechanisms, each of which includes a cylinder that is fixed to the first engaging member or the second engaging member and presses the locking pin from the second locking hole to the first locking hole.

According to the locking mechanism of this auger device, each of the pair of locking mechanisms is operated by an independent cylinder. The cylinder presses the locking 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 increases the reliability and safety of the work.

(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 direction in which the lock pin is inserted and removed, and includes a pressure direction conversion mechanism that inserts and removes the lock pin by expanding and contracting the cylinder.

According to the locking mechanism of this 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 motion into a force that efficiently pushes out or pulls back 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 in a direction perpendicular to the direction in which the lock pin is inserted and removed, increasing the freedom of cylinder placement.

(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 up-down direction, a second displacement member connected to the tip of the cylinder and the first displacement member and displaceable outward in the horizontal direction, and a third displacement member whose base end is connected to the tip of the cylinder, the first displacement member, and the second displacement member and whose tip is connected to the lock pin and displaceable inward in the horizontal direction, the first displacement member has a circular hole with a cross section, the second displacement member has a circular hole with a cross section located in the center of the horizontal direction and an oblong hole located on the outside, the third displacement member has a circular hole with a cross section on the base end side and the tip 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 an axis member, and the cylinder presses the first displacement member downward, causing the third displacement member to press the lock pin provided at the tip.

The locking mechanism of this auger converts the linear motion of the cylinder into the insertion and removal of the lock pin via multiple displacement members. The first displacement member receives vertical pressure from the cylinder, and this force can be efficiently converted into lateral motion via the second conversion member and the third displacement member. This locking mechanism allows for the application of force directly to the lock pin, improving the reaction speed and accuracy of the locking mechanism. In addition, the force is transmitted more efficiently between the parts, improving the overall reliability and durability of the device, reducing the maintenance costs of the auger device and increasing its uptime.

(6) In the above-mentioned locking mechanism of the auger device, the pair of pressure direction change mechanisms are connected to the first fitting member. According to this locking mechanism of the auger device, since the pressure direction change mechanism is connected to the first fitting member connected to the auger device, the pressure direction change mechanism can be moved simultaneously with the auger mechanism, improving the efficiency of excavation work.

(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 fitting member or the second fitting 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 through the elastic mechanism in a state where the first locking hole and the second locking hole are in communication with each other.

According to the locking mechanism of this auger device, each of the pair of locking mechanisms is fixed to a corresponding fitting member, and the design in which the locking pin is pressed via an elastic mechanism allows attachments to be replaced and fixed more quickly and reliably. This elastic mechanism allows the locking 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.

This system also ensures precise positioning of the locking pin, preventing the attachment from accidentally falling off during excavation and improving work safety. Furthermore, this mechanism continuously keeps the attachment securely fixed even during continuous work, improving the reliability and durability of the equipment.

(8) In the locking mechanism of the auger device described above, the second engaging member rotates 90° relative to the first engaging member, thereby connecting the second locking hole to the first locking hole.

According to the locking mechanism of this auger device, the first locking hole and the second locking hole are connected by rotating the second fitting member 90 degrees relative to the first fitting member, so that the attachment can be quickly and easily replaced and fixed. This rotation mechanism allows the locking pin to be easily inserted without manual operation or additional tools, greatly improving work efficiency. In addition, the direct communication by the rotation action increases the stability of the lock and minimizes the risk of the attachment slipping or falling off. This improves the safety and reliability of excavation work, contributing to time and cost savings at the work site.

(9) In the locking mechanism of the auger device described above, the second engaging member rotates 90° relative to the first engaging member as it rises with the rise of the auger device. This locking mechanism of the auger device allows the second engaging member to automatically align with the first engaging member, automating the process of inserting the lock pin into the correct position. This allows the attachment to be quickly and easily secured and released, making it easy to replace attachments even while excavation work is in progress.

(10) The excavation device according to the present invention fixes the auger device and the attachment with the above-mentioned locking mechanism that fixes the auger device and the attachment. With this excavation device, the attachment can be quickly and easily replaced or adjusted, greatly improving work efficiency. In addition, the secure fixation by the locking mechanism maintains the stability of the attachment during excavation work and increases work safety by preventing unexpected detachment or movement. In this way, the use of the locking mechanism improves the operability, efficiency, and safety of the excavation device, and enhances reliability and productivity at the work site.

(11) The method for replacing an attachment for an excavation device according to the present invention utilizes the excavation device described above, and is characterized in that 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, and the attachment is fixed by the locking mechanism so as not to come off the auger device.

According to this method of replacing an attachment for an excavation device, the attachment is securely fixed by the locking mechanism, which greatly reduces the risk of the attachment coming off the auger device during excavation. This method allows attachments to be easily and quickly attached and detached, greatly improving work efficiency. Furthermore, by reliably fixing the attachment, the safety and accuracy of excavation work is improved and the reliability of the device is maintained. This reduces work downtime and improves productivity.

According to the present invention, by automating the locking work required for attachment replacement, which requires work at height, manual work at height is no longer necessary, improving worker safety and efficiency while reducing work time and costs.

1 is a side view showing an excavation device according to a first embodiment of the present invention. FIG. 2A is a diagram showing a connection device provided on the excavation device shown in FIG. 1 , where (A) is a plan view, (B) is a front sectional view, and (C) is a bottom view. 2A to 2C are diagrams showing an attachment that can be attached to the auger device shown in FIG. 1 , in which (A) is a plan view, (B) is a front sectional view, and (C) is a bottom view. 3 is an exploded front view showing a pressing force conversion mechanism of the connection device shown in FIG. 2. 3A and 3B are front sectional views for explaining the operation of the locking mechanism of the connection device shown in FIG. 2, in which FIG. 3A shows a state before being locked, and FIG. 3B shows a state after being locked. FIG. 4 is a side view showing an excavation device according to a second embodiment of the present invention. 7A and 7B are diagrams showing a connection device provided on the excavation device shown in FIG. 6, in which (A) is a side view and (B) is a front view. 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 sectional view showing a state after locking.

The drilling device S according to an embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the up-down direction of the paper in Figs. 1 and 6 is also referred to as the "up-down direction" or "axial direction", the left-right direction of the paper in Figs. 1 and 6 is also referred to as the "front-rear direction", and the back-to-back direction of the paper is also referred to as the "lateral direction". In particular, the lower side of the up-down direction is also referred to as the tip direction, and the upper side is also referred to as the base direction.

The excavation device comprises 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. The auger device can be interchangeably fitted with various attachments or the same type of attachment. 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.

[First embodiment]
As shown in Fig. 1, an excavation device S1 according to a first embodiment of the present invention is used for excavation work in an environment with a headroom restriction, such as an overhead bridge. The excavation device 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 for exchangeably connecting the attachment S13 to the auger device S12.

In the first embodiment, because there is a headroom limit, a relatively small base machine is used as the base machine S11 for the excavation device S1, excavation is performed with the first attachment S13, and 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 excavate to a deeper depth, and excavation is performed by sequentially adding attachments S13 until the desired depth is reached.

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. The materials used for each part of the connection mechanism S14 are metal materials suited to their functions.

As shown in FIG. 2, the first connection part 10 is connected to the auger device S12 and includes a support part 12 that supports and fixes the first engaging member 11, the first engaging member 11 supported by the support part 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.

The support section 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 central connecting member 16.

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 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.

As shown in FIG. 3, the second fitting member 21 has a hexagonal connection shaft portion 21a that corresponds to the hexagonal connection hole of the first fitting member 11, and an attachment portion 23 that extends from the connection shaft portion 21a. The connection shaft portion 21a has a pair of second lock holes 21b that receive a lock pin 35 (described later) and are open laterally outward. Although not shown, the attachment portion 23 is formed in various shapes depending on the application of the attachment S13 that includes the second fitting member 21.

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 conversion mechanism 34 connected to the telescopic tip of the cylinder 33, and a lock pin 35 that converts the pressing force of the cylinder 33, which telescopically expands and contracts in the axial direction, into a horizontal direction and is pressed by the pressing force direction conversion mechanism 34. The lock pin 35 is formed in a roughly plate-like shape, and the tip portion facing the first lock hole 11b is formed in a semicircular cross section when viewed from the front, the first lock hole 11b is drilled in a shape corresponding to the tip portion of the lock pin 35, and the second lock hole 21b is drilled in a roughly rectangular cross section.

The base plate member 31 has a circular central portion 31c and two 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, and is connected to the first fitting member 11 by passing a bolt B through the periphery of the central portion 31c with the blind hole 11a and the through hole 31a communicating with each other. 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.

The cylinder support portion 32 comprises 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 a through hole (not shown) in the axial direction, and the expandable portion 33a of the cylinder 33 is inserted into the through hole, and the cylinder 33 is placed on it.

The pressure direction conversion 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 of a pair of plate-shaped members spaced apart in the front-rear direction perpendicular to the lateral direction.

As shown in FIG. 4, the first displacement member 34a has a first circular hole 34o with a circular cross section provided in each plate-like member, the second displacement member 34b has a second circular hole 34p with a circular cross section provided in each plate-like member and located on the horizontal center side, and an elongated hole 34q located on the horizontal outside, and the third displacement member 34c has a third circular hole 34r with a circular cross section provided in each plate-like member and located on the horizontal outside, and a fourth circular hole 34s with a circular cross section located on the horizontal center side. The first circular hole 34o to the fourth circular hole 34s and the elongated hole 34q penetrate each plate-like member of each displacement member.

As shown in FIG. 5, the first circular hole 34o of the first displacement member 34a, the second circular hole 34p of the second displacement member 34b, and the third circular hole 34r of the third member are coaxially passed through the first shaft member 34u and rotatably connected. The long hole 34q of the second displacement member 34b is rotatably passed through and connected to the second shaft member 34v provided on the first support portion 12 of the cylinder support portion 32. Furthermore, the third displacement member 34c is rotatably connected to the lock pin 35 by passing the third shaft member 34w through the fourth circular hole 34s.

When the cylinder 33 expands and contracts in the vertical direction, the first displacement member 34a is displaced vertically, and in conjunction with this, the second displacement member 34b and the third displacement member 34c are displaced, displacing the lock pin 35 in the horizontal direction. Specifically, when the expansion and contraction portion 33a of the cylinder 33 is located at the top, the first displacement member 34a rises, the center side of the second displacement member 34b and the outside of the third displacement member 34c are located at the top, and the second displacement member 34b is in an oblique state with the center side higher, and the third displacement member 34c is in an oblique state with the outside side higher (see FIG. 5(A)).

When the tip of the cylinder 33 is located downward, the first displacement member 34a descends, and the second displacement member 34b and the third displacement member 34c are in a horizontal state. When the telescopic member of the cylinder 33 moves from the upper position to the lower position, the long hole 34q of the second displacement member 34b is displaced from a state in which the second shaft member 34v is received on the outside to a state in which it is received on the inside. When the second shaft member 34v is located on the innermost side of the long hole 34q, the second displacement member 34b is in a horizontal state. At this time, since the third circular hole 34r of the third displacement member 34c is axially fixed to the second circular hole 34p of the second displacement member 34b, the third displacement member 34c is in a horizontal state so that the fourth circular hole 34s is displaced toward the center. As a result, the third displacement member 34c is displaced so as to press the lock pin 35 inward (see FIG. 5B).

In the drilling device 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 communicates with the second lock hole 21b of the second fitting member 21, and the cylinder 33 of the locking 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.

The excavation device S1 performs excavation by attaching a first excavation attachment S13 to the auger device S12, and then replaces the second excavation attachment S13 with the attachment S13 buried in the ground. 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 device S12 is automatically locked by the cylinder 33. The excavation device S1 requires frequent replacement of the attachment S13, but in this embodiment, the replacement of the attachment S13 is easy and safe, which increases the efficiency of excavation work.

In the first embodiment of the present invention, the locking mechanism is described as having a cylinder that expands and contracts in the vertical direction and presses the lock pin laterally via a pressure conversion mechanism. However, the locking mechanism may also be configured such that the cylinder expands and contracts laterally to press the lock pin laterally.

In the first embodiment of the present invention, the locking mechanism is described as converting the pressing force of the cylinder using a first displacement member, a second displacement member, and a third displacement member. However, the locking mechanism may be configured in a different way to convert the pressing force.

Second Embodiment
The excavation device S2 according to the second embodiment of the present invention is used for excavation work when constructing existing foundation piles in the ground to support large structures such as buildings, roads, railways, bridges, etc. The excavation device 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 exchangeably connects the attachment S23 to the auger device S22.

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

The connection mechanism S24 is formed from 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. Metal materials suited to the function are used for the materials of each part of the connection mechanism S24.

As shown in FIG. 7, the first connection portion 60 includes an extending support member 62 that is connected to the auger device S22, a first engaging member 61 that is 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 later) is engaged with the first engaging member 61.

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 periphery of the tip circular base plate 62a and the base end disc member 61a are fixed 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 lock hole 61c that penetrates laterally and an axial hole 61d adjacent to the lower side of the first lock hole 61c.

The second fitting member 71 includes a rotation receiving portion 71a that rotatably receives the tip rod-shaped member 61b, an extended support member 72 that extends from the rotation receiving portion 71a, and an attachment receiving portion 73 that receives an attachment S23 that is connected to the tip of the extended 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 lock holes 71c that penetrate both sides of the U-shape, and a pair of second shaft holes 71d that are adjacent to and below the pair of lock holes 71c. The rotation receiving portion 71a is connected to the lower end of the U-shape by fixing the extended support member 72 by welding.

The rotation receiving portion 71a of the second fitting member 71 is rotatably connected to the first fitting member 61 by passing the shaft portion 73d through the shaft hole 61d and the pair of shaft holes 71d in a state where the shaft hole 61d of the tip rod-shaped member 61b of the first fitting member 61 and the pair of shaft holes 71d of the second fitting member 71 are in communication with each other. 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 are in communication with each other in a state where the first fitting member 61 and the second fitting member 71 are aligned in the vertical direction, and the lock pin 85 is inserted through them, and are formed so that the position of the hole is shifted and the lock pin 85 cannot be inserted in any other state.

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 parts 86 that press the locking pins 85 toward the center. Each elastic part 86 is connected to the rotation receiving portion 71a, and the locking pin 85 is connected to the elastic part 86. The locking pin 85 is inserted into both side parts 71d of the rotation receiving portion 71a and is pressed by the elastic part 86 toward the through hole of the tip rod-shaped member 61b.

The drilling device S2 is assembled so that the pair of first lock holes 61c of the first fitting member 61 communicates with the pair of second lock holes 72c of the second fitting member 71 with the tip rod member 61b of the first fitting member 61 and the extending support member 62 of the second fitting member 71 aligned in the vertical direction, and the elastic portion 86 of the lock 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 communicating, the lock pin 85 is passed through the first lock hole 61c and the pair of second lock holes 72c to lock the first fitting member 61 and the second fitting member 71.

As shown in FIG. 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 in a state aligned horizontally. When the auger device S22 is then raised, the first fitting member 61 also rises as shown in FIG. 8(B), and one end of the second fitting member 71 is lifted along with the rise of the first fitting member 61. 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 with each other, and the first fitting member 61 and the second fitting member 71 are locked.

In the method for replacing an attachment for an excavation 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.

In the second embodiment of the present invention, the locking mechanism has been described as being configured such that 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 be configured in other ways 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.

In the embodiment of the present invention, the locking mechanism has been described as being configured such that a cylinder or an elastic portion presses against a lock pin to automatically fix (lock) the first and second fitting members. However, the locking mechanism may be configured such that another mechanism automatically fixes (locks) the first and second fitting members.

In the embodiment of the present invention, the locking mechanism has been described as having a pair of cylinders or a pair of elastic parts each pressing a lock pin to fix (lock) the first fitting member and the second fitting member. However, the locking mechanism may also have a form in which one cylinder or one elastic part presses one lock pin to fix (lock).

The above describes an excavation device, a locking mechanism for an excavation device, and a method for replacing an attachment for an excavation device according to an embodiment of the present invention. However, the excavation device, the locking mechanism for an excavation device, and a method for replacing an attachment for an excavation device are not limited to the above embodiment, and other configurations may be used within the scope of achieving the object of the invention.

This invention can be used to remove buried piles.

B: Bolt S: Drilling device S1: Drilling device S11: Base machine S12: Auger device S13: Attachment S14: Connection mechanism S2: Drilling device S21: Base machine S22: Auger device S23: Attachment S24: Connection mechanism 10: First connection portion 11: First fitting member 11a: Hole 11b: First lock hole 12: Support portion 13: Lock mechanism 14: First disc member 15: Second disc member 16: Coupling member 20: Second connection portion 21: Second fitting member 21a: Connection shaft portion 21b: Second lock hole 22: Second support portion 23: Attachment portion 30: Lock mechanism 31: Base member 31a: Hole 31b: Both side portions 31c: Central portion 32 : Cylinder support portion 33 : Cylinder 33a : Expandable portion 34 : Pressing force direction conversion mechanism 34a : First displacement member 34b : Second displacement member 34c : Third displacement member 34o : First circular hole 34p : Second circular hole 34q : Long hole 34r : Third circular hole 34s : Fourth circular hole 34u : First shaft member 34v : Second shaft member 34w : Third shaft member 35 : Lock pin 60 : First connection portion 61 : First fitting member 61a : Base end disc member 61b : Tip rod-shaped member 61c : First lock hole 61d : Shaft hole 62 : Extension support member 62a : Tip circular base plate 70 : Second connection portion 71 : Second fitting member 71a : Rotation receiving portion 71c : Second lock hole 71d : Shaft hole 72 : Extension support member 72c : Second lock hole 73d : Shaft portion 80 : Lock mechanism 85 : Lock pin 86 : Elastic portion

Claims (11)

A first fitting member is provided at the lower end of an auger device that is used for pile driving and ground improvement work and is located at a high altitude;
a second fitting member that fits into the first fitting member;
a lock mechanism for maintaining a state in which the first fitting member and the second fitting member are fitted together,
the first fitting member has a first lock hole,
the second fitting member has a second lock hole communicating with the first lock hole when the first fitting member and the second fitting member are fitted together,
The locking mechanism of the auger device is characterized in that the locking pin is inserted into the first locking hole and the second locking hole which are connected, and when the first engaging member and the second engaging member are engaged, the locking pin is pressed so as to automatically insert into the first locking hole and the second locking hole. the first fitting member has a pair of the lock holes,
2. The locking mechanism for an auger machine 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. 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 configured to press the locking pin from the second locking hole to the first locking hole. The cylinder is provided so as to expand and contract in a direction perpendicular to a direction in which the lock pin is inserted and removed,
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 expanding and contracting the cylinder. Each pressing force direction conversion mechanism is
a first displacement member connected to a tip end of the cylinder and capable of being displaced in a vertical direction;
a second displacement member connected to a tip end 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 a tip end 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 inwardly 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 perfect circular hole on a tip end side,
the first displacement member, the second displacement member, and the third displacement member are rotatably supported by a shaft member;
5. The lock 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 a tip end of the third displacement member. The locking mechanism according to claim 5, wherein the pair of pressure direction conversion mechanisms are connected to the first fitting member. 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 elastic mechanism has a lock pin inserted therethrough in a state in which the first locking hole and the second locking hole are in communication with each other. The locking mechanism according to claim 7, wherein the second engaging member rotates relative to the first engaging member to communicate with the second locking hole. The locking mechanism according to claim 8, wherein the second engaging member rotates relative to the first engaging member by rising in conjunction with the rise of the auger device. An excavating rig, wherein an attachment is secured to the auger assembly by a locking mechanism as set forth in claim 1. 2. A method for replacing an attachment, comprising : fixing an attachment to the auger device by the locking mechanism according to claim 1 so that the attachment does not come off the auger device;
fitting the first fitting member and the second fitting member together so that the first lock hole and the second lock hole communicate with each other ;
and automatically inserting the lock pin into the first lock hole and the second lock hole while the first engaging member and the second engaging member are engaged with each other.

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