Pile driver

Abstract

To provide a pile driver capable of easily and accurately adjusting the inclination of a leader in the lateral direction with respect to an upper turning body.SOLUTION: The leader is provided with a neutral position at which the inclination in the left-right direction with respect to the upper slewing body is set to be vertical, the neutral position being provided in the middle of a range from a maximum extension state to a minimum contraction state of the leader left-right inclination cylinder 33, the leader left-right inclination cylinder includes an inclination restriction member 42 that changes the state of the leader to a leader inclinable state in which the contraction operation of the leader from the neutral position is allowed and a leader inclination restriction state in which the inclination is restricted, the inclination restriction member includes a ring member 45 rotatably attached to the outer peripheral portion of the cylinder tube 39 of the leader left-right inclination cylinder, and a pair of block members 46 disposed to face the outer peripheral portion of the ring member, the leader inclination regulating state is formed by bringing a pair of block members into contact with a pair of brackets 38 on which the piston rod 40 of the left and right inclination cylinder of the leader is pivotally mounted.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The present invention relates to a pile driver, and more particularly to a pile driver that can be transported without disassembly by placing the leader in a transport position with the leader laid down. [Background technology]

[0002] In a small pile driver, a leader support (leader support frame) is pivotally supported on the front of the upper rotating body so that it can rotate left and right, and the leader is pivotally supported on the leader support so that it can rotate back and forth, and the leader support and leader can be pivoted forward and backward and left and right by left and right tilting cylinders and elevation cylinders, respectively, to center the leader at a predetermined angle, for example, by raising it up vertically (see, for example, Patent Document 1). Also, when the leader is tilted horizontally, the leader and the driver's room (cab) are arranged side by side, which allows the pile driver to be positioned for transportation with a reduced overall height (see, for example, Patent Document 2).

[0003] For safety reasons, the pile driver described above is controlled to have a cab interference prevention function. For example, when the leader, which is aligned perpendicular to the upper rotating body, is tilted to the left or right by a predetermined angle, an attached limit switch is activated, making it impossible to tilt the leader backward. On the other hand, once the pile driver is in the transport position, tilting of the leader is also impossible. This prevents interference between the cab and the leader. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-219916 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-141937 Summary of the Invention [Problem to be solved by the invention]

[0005] In small pile drivers that require a compact transportation posture, if the leader is tilted even slightly to the left or right with respect to the upper rotating body, the cab interference prevention function will be activated, so the operation of aligning the leader vertically can be a burden on the operator. Furthermore, on slopes, even if the leader is set up vertically, it will not be perpendicular to the upper rotating body, so the operator will have to be even more careful when operating the leader.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a pile driver that can easily and accurately adjust the left-right inclination of the leader relative to the upper rotating body. [Means for solving the problem]

[0007] In order to achieve the above object, the pile driver of the present invention is provided with a leader support pivotally supported on the front of an upper rotating body so as to be rotatable in the left-right direction, a leader pivotally supported on the leader support so as to be rotatable in the front-rear direction, a leader hoisting cylinder that rotates the leader in the front-rear direction, and a leader left-right tilting cylinder that rotates the leader support in the left-right direction, wherein the neutral position of the leader, which makes the left-right tilt perpendicular to the upper rotating body, is set midway between the fully extended state and the fully contracted state of the leader left-right tilting cylinder, The tilt restricting member is provided to change the leader tilt state between a leader tiltable state in which the leader is allowed to retract from its neutral position and a leader tilt restricted state in which the leader is restricted, and the tilt restricting member has a ring member rotatably attached to the outer periphery of the cylinder tube of the leader left / right tilt cylinder, and a pair of block members arranged opposite to the outer periphery of the ring member, and the leader tilt restricted state is created by the pair of block members respectively abutting against a pair of brackets that pivotally mount the piston rods of the leader left / right tilt cylinder. [Effects of the Invention]

[0008] According to the pile driver of the present invention, the tilt restriction member includes a ring member and a pair of opposing block members. Therefore, when switching between the leader tilt-enabled state and the leader tilt-restricted state, the block member (contact member) and the bracket (contacted member) can be aligned simply by rotating the tilt restriction member 90 degrees. Furthermore, when creating the leader tilt-restricted state, the leader can be hydraulically maintained in its neutral position even after the block member contacts the bracket. In particular, because the pile driver is not affected by the tilt of the upper rotating body, the neutral position for tilting the leader backward can be accurately achieved while reducing the burden on the operator. In other words, a pile driver can be realized that can easily and accurately adjust the left-right tilt of the leader relative to the upper rotating body. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a side view showing a pile driver according to an embodiment of the present invention in a working position with a leader raised; [Figure 2] FIG. 10 is a side view of the main part showing the state of the leader in the neutral position. [Figure 3] FIG. [Figure 4] FIG. 10 is a front view of the main part showing a state in which the leader left and right tilt cylinders are contracted and the leader is tilted from the neutral position. [Figure 5] FIG. 10 is an enlarged front view of the main part showing the reader in a tiltable state. [Figure 6] FIG. 10 is an enlarged perspective view of the main part showing the reader in a tiltable state. [Figure 7] FIG. 10 is an enlarged front view of the main part showing the leader tilt regulation state. [Figure 8] FIG. 10 is an enlarged perspective view of the main part showing the leader tilt regulation state. [Figure 9] FIG. 10 is a front view of the main part showing the leader tilt regulation state. DETAILED DESCRIPTION OF THE INVENTION

[0010] Figures 1 to 9 show one example of a pile driver of the present invention. As shown in Figure 1, the pile driver 11 is equipped with a base machine (main body) 14 consisting of a lower running body 12 equipped with crawlers and an upper rotating body 13 rotatably mounted on the lower running body 12, a leader 15 erected at the front of the upper rotating body 13, a leader raising and lowering cylinder 16 that supports the leader 15 from behind, and an auger (working device) 17 that is guided up and down along the front of the leader 15.

[0011] A leader support 18 that supports the leader 15 so that it can be raised and lowered is provided at the front of the upper rotating body 13. A driver's cab 19 is provided on the right side of the upper rotating body 13, and an equipment room 20 that houses an engine and hydraulic unit is provided on the left side. Furthermore, stabilizing jacks 21 are provided at four locations on the front, rear, left and right sides of the upper rotating body 13, and a counterweight 22 is mounted at the rear end of the upper rotating body 13 to balance the pile driver 11.

[0012] The leader 15 is made up of multiple leader members each having a rectangular cylindrical cross section that are detachably connected to one another, and the tip of the leader hoisting cylinder 16 is rotatably connected to a cylinder bracket 23 provided on the rear surface via a connection pin 24. The leader 15 is also formed in a divided form into a basic leader 26 rotatably attached to a support shaft (rotating pin) 25 in the width direction of the upper rotating body provided on the leader support 18, an upper leader 27 connected to the upper part of the basic leader 26, and a lower leader 28 connected to the lower part of the basic leader 26, and further, the upper leader 27 is formed in a divided form into multiple upper leader members.

[0013] Each leader member has a flange joint formed by fastening adjacent flanges together with bolts and nuts, and can be reassembled to different leader lengths by removing the bolts and nuts. A top sheave 29, around which the lifting rope is wound, is located at the top end of the upper leader 27, and a lower guide 30, which prevents the swing of the rotating construction material (e.g., steel pipe piles), is located at the front of the lower part of the lower leader 28. Furthermore, a rack gear 31, one of the components of the rack and pinion lifting device, is located at the center of the front side of the leader 15, and a pair of left and right guide pipes 32 are continuously installed along the entire length of the leader 15 at the front ends of both widthwise sides, forming a lifting path for the auger 17.

[0014] 2 and 3, the leader support 18 is journaled on a rotation shaft (rotation pin) 34 disposed on one side of the main frame 33 of the upper rotating body 13, on the right side in FIG. 2 of this embodiment, and in the front-to-rear direction (left-to-right direction in FIG. 2) in FIG. 3, so as to be rotatable in the left-to-right direction, and a leader left-to-right tilt cylinder 35 is provided on the rotation end side of the leader support 18 opposite the rotation shaft 34, i.e., on the left side of the upper rotating body 13. In addition, the base end of the leader hoisting cylinder 16 is rotatably connected to the rear end of the leader support 18 via a connection pin 36.

[0015] The leader left / right tilt cylinder 35 is arranged vertically between a pair of front and rear tube side cylinder brackets 37, 37 that form the rotating end side of the leader support 18 and a pair of front and rear rod side cylinder brackets 38, 38 that protrude from the main frame 33 side, and mainly comprises a cylinder tube 39 with a retention valve 39a attached to the upper end, a piston rod 40 inserted so as to be able to slide freely within the cylinder tube 39, a rod cover 41 that is screwed into the rod side opening of the cylinder tube 39 and holds the piston rod 40 slidably and liquid-tightly, and a tilt regulating member 42 (details will be described later) attached to the outer periphery of the cylinder tube 39.

[0016] The cylinder tube 39 has a trunnion bearing structure on both sides of its outer periphery, and is pivotally attached by support shafts (support pins) 43, 43 arranged in the front-rear direction between a pair of front and rear tube-side cylinder brackets 37, 37. On the other hand, the piston rod 40 has a clevis 40a with a pin hole at its tip, and is pivotally attached by a support shaft (support pin) 44 arranged in the front-rear direction between a pair of front and rear rod-side cylinder brackets 38, 38.

[0017] When the leader left-right tilt cylinder 35 is operated to extend or retract, the leader support 18 rotates left and right around the rotation shaft 34, and the left-right tilt angle of the leader 15 provided in front of the leader support 18 can be adjusted. In this case, the neutral position (position in Figure 3) of the leader 15, where the left-right tilt is perpendicular to the upper rotating body 13, is located midway between the fully extended state (most extended state) of the leader left-right tilt cylinder 35 and the fully retracted state (most retracted state), that is, at the middle position of the extension stroke.

[0018] As a result, for example, the leader left / right tilt cylinder 35 can be contracted, and the leader 15 can be tilted to the left from its neutral position by a predetermined tilt angle θ (for example, a maximum of 3 degrees) as shown in Fig. 4. Although not shown, the leader 15 can also be tilted on the opposite side (right side) at the same angle as the tilt angle θ. That is, the left / right tilt of the leader 15 progresses from the intermediate position until the leader left / right tilt cylinder 35 reaches the telescopic stroke end, and when the telescopic stroke end is reached and the operating pressure is relieved, the left / right tilt of the leader 15 becomes maximum.

[0019] When the leader derrick cylinder 16 is extended or retracted, the leader 15 rotates in the front-to-rear direction around the support shaft 25, making it possible to adjust the tilt angle of the leader 15 in the front-to-rear direction. Here, when the pile driver 11 is in a working position (FIG. 1) with the leader 15 standing upright and the leader derrick cylinder 16 is retracted to its most contracted position, the leader 15 moves to a transport position (not shown) in which it lies approximately horizontally on top of the upper rotating body 13, and the leader 15 and the cab 19 are arranged side by side. In this case, the pile driver 11's cab interference prevention function comes into operation, preventing interference between the cab 19 and the leader 15 (see the description of the background art).

[0020] In a small pile driver 11 that requires a compact transportation posture, the cab interference prevention function is activated if the leader 15 is tilted even slightly to the left or right with respect to the upper rotating body 13, so the operator's operation to align the leader 15 vertically can be a burden. Furthermore, on sloping ground, even if the leader 15 is set upright relative to the ground, it will not be perpendicular to the upper rotating body 13, so the operator must operate the leader 15 with even greater care. Therefore, the pile driver 11 is provided with a tilt restriction member 42 that can easily and accurately adjust the left-right tilt of the leader 15 relative to the upper rotating body 13.

[0021] As shown in Figures 5 to 8, the tilt regulation member 42 is an attached member of the leader left / right tilt cylinder 35, and has a ring member 45 rotatably attached to the outer periphery of the cylinder tube 39, and a pair of block members 46, 46 arranged opposite to the outer periphery of the ring member 45.

[0022] The ring member 45 has an inner diameter slightly larger than the outer diameter of the cylinder tube 39 and an outer diameter slightly larger than the outer diameter of the rod cover 41, and is held by being sandwiched between the rod cover 41 and a flange 47 fixed to the outer periphery of the cylinder tube 39 (FIGS. 5 and 7). This allows the ring member 45 to rotate about the cylinder axis, but restricts movement in the axial direction of the cylinder. The block member 46 is formed in a rectangular parallelepiped extending parallel to the cylinder axis. The width is slightly smaller than the width across two faces of the clevis 40a of the piston rod 40 (FIG. 2), and the thickness is about half the width. The upper ends of the two paired block members 46 are aligned with the upper ends of the ring members 45, and are fixed to the outer peripheries 180 degrees out of phase with each other. It also extends further downward from the lower end of the ring member 45 and has a length that allows it to abut against the upper end flat surfaces 38a, 38a (described later) of the pair of front and rear rod side cylinder brackets 38, 38 when the leader 15 is in the neutral position.

[0023] The tilt restriction member 42 formed in this manner can be manually operated by rotating the ring member 45 and a pair of block members (abutment members) 46, 46 together 90 degrees around the cylinder circumferential direction to change between a leader tiltable state (Figures 2 to 6) in which the leader 15 is allowed to retract from its neutral position and a leader tilt restricted state (Figures 7 to 9) in which this is restricted.

[0024] In the leader tiltable state, the pair of block members 46, 46 are arranged opposite each other in the left-right direction, and tilting of the leader 15 on both the left and right sides from the neutral position is permitted up to the maximum tilt angle θ. In this state, the block member 46 does not come into contact with other structures, including the rod-side cylinder bracket 38, at any position of the leader left-right tilt cylinder 35 from the intermediate position to the extension stroke end, i.e., over the entire stroke range. For example, when the leader left-right tilt cylinder 35 is contracted from the neutral position of the leader 15 (Fig. 3), a part (the lower end) of the block member 46 enters the space between the pair of front and rear rod-side cylinder brackets 38, 38, and a non-contact state with the outside is maintained even when the tilt angle θ reaches the maximum (Fig. 4).

[0025] In the leader tilt restricted state, a pair of block members 46, 46 are arranged opposite each other in the front-rear direction, and tilt of the leader 15 to the right from the neutral position is permitted up to a maximum tilt angle θ, while tilt to the left from the neutral position is restricted. For example, when the leader left-right tilt cylinder 35 is contracted from near the neutral position (right-side tilt region), the pair of block members 46, 46 abut (make surface contact) with the upper end flat surfaces (machined surfaces) 38a, 38a of the pair of front and rear rod-side cylinder brackets (contacted members) 38, 38, as shown in Figures 8 and 9, with the lower surface of one block member 46 aligned with the front end and the lower surface of the other block member 46 aligned with the rear end, respectively. At this time, almost simultaneously with the abutment of the lower surfaces, the upper surface of the opposite block member abuts (makes surface contact) with the lower surface of the flange 47. Therefore, the contraction of the leader left-right tilt cylinder 35 is restricted, and the operating pressure is relieved before the retraction stroke end is reached, maintaining the leader 15 in the neutral position.

[0026] As a result, when the operator changes the position of the pile driver 11 from the working position to the transport position, there is no need to tilt the leader 15 left or right to make it vertical, but rather the operator only needs to check that the leader 15 is immobile (for example, by visual inspection or listening to the operating sound of the hydraulic relief state), keeping in mind the stopper action of the tilt control member 42.

[0027] As described above, according to the pile driver 11 of the present invention, the tilt restriction member 42 includes the ring member 45 and a pair of block members 46 arranged opposite to each other. Therefore, when switching between the leader tilt-enabled state and the leader tilt-restricted state, the block member (contact member) 46 and the bracket (contacted member) 38 can be aligned simply by rotating the tilt restriction member 42 90 degrees. Furthermore, when creating the leader tilt-restricted state, the state can be hydraulically maintained even after the block member 46 contacts the bracket 38, i.e., after the neutral position of the leader 15 is achieved. In particular, because the pile driver 11 is not affected by the tilt of the upper rotating body 13, the neutral position for tilting the leader 15 backward can be accurately achieved while reducing the burden on the operator. In other words, a pile driver 11 can be realized that can easily and accurately adjust the left-right tilt of the leader 15 relative to the upper rotating body 13.

[0028] The present invention is not limited to the above-described embodiment, and the configuration of the tilt restriction member can be modified as needed in terms of its shape, size, and location, as long as it satisfies the dimensional relationship that takes into account strength and movement when provided on one side of the leader support. Furthermore, the specifications of various structures and devices, such as the leader and leader support, and the upper rotating body, are arbitrary. Furthermore, even in the case of later modifications, the leader left and right tilt cylinders and the tilt restriction member can be easily replaced as assembled parts (sub-assembly), which broadens the range of applications of the small pile driver in the various environments in which it is used. [Explanation of symbols]

[0029] 11...Pile driver, 12...Lower running body, 13...Upper rotating body, 14...Base machine, 15...Leader, 16...Leader derricking cylinder, 17...Auger, 18...Leader support, 19...Operator's cab, 20...Equipment room, 21...Jack, 22...Counterweight, 23...Cylinder bracket, 24...Connecting pin, 25...Support shaft, 26...Basic leader, 27...Upper leader, 28...Lower leader, 29...Top sheave, 30...Lower guide, 31...Rack gear, 3 2...guide pipe, 33...main frame, 34...rotating shaft, 35...leader left / right tilt cylinder, 36...connecting pin, 37...tube side cylinder bracket, 38...rod side cylinder bracket, 38a...upper end flat portion, 39...cylinder tube, 39a...retention valve, 40...piston rod, 40a...clevis, 41...rod cover, 42...tilt restriction member, 43, 44...support shaft, 45...ring member, 46...block member, 47...flange

Claims

[Claim 1] a leader support pivotally supported on the front of the upper rotating body so as to be rotatable in the left-right direction; a reader supported by the reader support so as to be rotatable in the front-rear direction; a leader elevation cylinder for rotating the leader in the front-rear direction; A pile driver equipped with a leader left / right tilt cylinder that rotates the leader support in the left / right direction, The leader has a neutral position where the left-right tilt cylinder is perpendicular to the upper rotating body, the neutral position being located midway between the most extended state and the most contracted state of the leader left-right tilt cylinder, The leader left / right tilt cylinder is provided with a tilt restriction member that changes between a leader tiltable state in which the leader is allowed to retract from the neutral position and a leader tilt restricted state in which the leader is restricted, The tilt restriction member is a ring member rotatably attached to the outer periphery of the cylinder tube of the leader left-right inclination cylinder; a pair of block members disposed opposite each other on the outer periphery of the ring member, The pile driver is characterized in that the leader tilt restricted state is established by the pair of block members abutting against a pair of brackets that pivotally mount piston rods of the left and right leader tilt cylinders.

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