JP3701905B2 - Pile driver - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pile driving machine that supports a foldable leader so as to fall down, and more particularly to a pile driving machine provided with a lock mechanism that maintains a folded state of the leader with a lock pin.
[0002]
[Prior art]
A pile driving machine that performs foundation work such as pile driving has a leader for raising and lowering a working device such as an auger, and the leader is supported to be raised and lowered with respect to a base machine. Among such pile driving machines, there is one in which the leader is divided in the longitudinal direction and can be bent by a hinge on the way. Such a pile driver can take a long lifting stroke of the working device that moves up and down along the leader if it is extended when the leader is erected. The overall length of the hitting machine can be shortened and can be mounted on a transport vehicle such as a trailer.
[0003]
Incidentally, the present applicant has also proposed a pile driver equipped with a folding reader in Japanese Patent Application No. 2001-155248. For this purpose, the upper leader is foldably connected to the lower leader supported by the backstay cylinder so that it can be raised and lowered, and the upper leader located on the lower side overlaps the lower leader, especially when lying down in the folded state. A lock mechanism is provided so that the free end side can be connected to the lower reader side via a lock pin so that the folded state can be maintained.
[0004]
[Problems to be solved by the invention]
However, with a lock mechanism that only has a lock pin inserted, the upper reader is connected to the lower reader if the lock pin may accidentally come off when the reader is tilted, such as during transport. Rotating and dropping using the hinge as a fulcrum. Therefore, in order to prevent the upper leader from rotating and dropping, it is necessary to reliably maintain the folded state.
[0005]
Then, an object of this invention is to provide the pile driver provided with the lock mechanism in which a lock pin does not fall out when a leader is laid down in the folded state.
[0006]
[Means for Solving the Problems]
The pile driver of the present invention supports a foldable leader in which an upper leader and a lower leader are connected by a hinge so as to be able to fall down, and when the upper leader rotated by using the hinge as a fulcrum is folded over the lower leader, The lock mechanism is provided with a lock mechanism that inserts a lock pin into the pin hole where the brackets of the upper reader and the lower reader are overlapped to maintain the folded state, and the lock mechanism hangs down in the vertical direction to tilt the reader. There is a pendulum type stopper that rotates relatively in response, and when the leader is tilted almost horizontally, the stopper is located on the path of the lock pin to prevent it from coming out of the pin hole. It is characterized by the above.
[0007]
Therefore, according to the present invention, the state where the upper leader is folded and overlapped with the lower leader is maintained by the lock mechanism, but the stopper is positioned on the path of the lock pin when the leader is tilted almost horizontally. Thus, the lock pin can be securely prevented from coming off.
[0008]
Further, in the pile driving machine of the present invention, when the locking mechanism has a protruding member formed integrally with the locking pin inserted into the guide member, the protruding member jumps out of the guide member when the locking pin comes out of the pin hole. The protruding portion of the guide member that protrudes from the protruding member when the leader falls almost horizontally is blocked by the stopper.
Therefore, according to the present invention, the release of the lock pin can be confirmed by protruding the protruding member from the guide member, and the protruding portion of the guide member is blocked by the stopper to stop the protruding member from protruding, thereby securely locking. The pin can be prevented from coming off.
[0009]
Further, the pile driving machine of the present invention is characterized in that the stopper has a stop plate that prevents the stopper from rotating beyond the exit path of the lock pin.
Therefore, according to the present invention, even when the leader is tilted more than the horizontal, the stopper is positioned on the path of the lock pin, so that the lock pin can be reliably prevented from coming off.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, a pile driver according to the present invention will be described below with reference to the drawings. FIG. 1 to FIG. 5 are diagrams showing a pile driving machine equipped with a foldable leader, and each process when the leader is folded. In this pile driving machine 1, a base machine 4 is constituted by a lower traveling body 2 and an upper swing body 3, and a leader 5 pivotally attached to the front part of the base machine 4 can be raised and lowered by an expansion and contraction operation of a backstay cylinder 6. It is supported by. The leader 5 includes a short upper leader 11 and a long lower leader 12 that are pivotally mounted by a hinge 13 attached to the back side. The lower leader 12 is directly supported by the backstay cylinder 6. Yes.
[0011]
As shown in FIG. 1, the pile driving machine 1 is assembled as a single leader 5 by fixing the connecting portion between the upper leader 11 and the lower leader 12 with bolts during work, and this is an extension of the backstay cylinder 6. Wake up almost vertically by actuation. The auger 10 attached to the leader 5 so as to be movable up and down is lowered along the leader 5 while rotating an auger screw (not shown) connected to the leader 5 to perform excavation work.
[0012]
On the other hand, when the pile driving machine 1 is transported, the upper leader 11 is folded to the lower leader 12 side, and the leader 5 having a shorter overall length is brought down and stored on the base machine 4 almost horizontally. . Next, folding of the reader 5 will be described.
The leader 5 is folded when the leader 5 in the standing state shown in FIG. 1 is tilted by the contraction operation of the backstay cylinder 6 until the tip side is slightly inclined downward from the horizontal state as shown in FIG. As a result, the top sheave 13 at the tip of the leader 5 is lowered to a low position to facilitate the work, and the top sheave 13 is hooked on the wire rope 21 from the companion crane 20.
[0013]
Since the upper leader 11 is suspended from the wire rope 21, the upper leader 11 will not rotate and fall even if the bolt that fixes the upper leader 11 and the lower leader 12 is removed next time. When the wire rope 21 is subsequently unwound from the companion crane 20, the upper leader 11 is gradually bent with the hinge 13 as a fulcrum by its own weight.
[0014]
In the bent upper leader 11, as shown by a two-dot chain line in FIG. 3, the rolling roller 16 provided on the top sheave 15 hits the ground. Therefore, when the lower leader 12 is raised by the extension operation of the backstay cylinder 6 that follows, the upper leader 11 is pulled up while the rolling roller 16 slides on the ground, and moves toward the base machine 4 as shown by the solid line in FIG. It will be attracted. Thereafter, when the lower leader 12 is further raised, the upper leader 11 is suspended from the lower leader 12 via the hinge 13 as shown by a two-dot chain line in FIG. 4, and the angle of the lower leader 12 with the ground increases. Accordingly, the free end side is brought closer to the lower reader 12.
[0015]
When the lower reader 12 is raised almost vertically, the upper reader 11 is folded so as to overlap the lower reader 12 as shown by the solid line in FIG. 4, and the free reader side of the upper reader 11 is locked by the lower reader 12 by the lock mechanism. Connected to the side. That is, since the pin holes 34 opened in the brackets 32, 33 of the upper leader 11 and the lower leader 12 overlap, a lock pin is inserted into the pin holes 34 by the operation of the cylinder 31, and the free end of the upper leader 11. The side is pin-coupled to the lower reader 12 side and the folded state is maintained.
[0016]
The folded leader 5 is again brought down to a substantially horizontal position by the back stay cylinder 6 being contracted. Thus, the pile driving machine 1 in which the leader 5 is stored has a short overall length and can be mounted on the trailer 22 as shown in FIG. The lower leader 12 is formed by connecting a plurality of leader members with bolts, and particularly the lower end leader 12a is connected with a hinge. Therefore, when transporting, the auger 10 is mounted as shown in FIG. It can be bent as it is.
On the other hand, when the folded reader 5 is brought into the working state shown in FIG. 1, the lock pin is removed in the state shown by the solid line in FIG.
[0017]
Next, the lock mechanism 30 for maintaining the upper reader 11 and the lower reader 12 in the folded state will be described. 6 is a structural view showing the lock mechanism 30, FIG. 7 is a view seen from the direction of arrow A in FIG. 6, and FIG. 8 is a view seen from the direction of arrow B in FIG. In this locking mechanism 30, the bracket 33 on the lower leader 12 side is a bifurcated one composed of brackets 33 a and 33 b, and the bracket 32 (not shown) of the upper leader 11 enters between the brackets 33 a and 33 b, and overlaps with each other. The lock pin 35 is inserted into the pin hole 34. The lock mechanism 30 is mounted on such a bracket 33a.
[0018]
A cylindrical guide 36 is fixed to the bracket 33 a coaxially with the pin hole 34, and a pin flange 35 a that moves along the guide 36 is formed integrally with the pin 35. A cylindrical marking member 37 fixed to the pin flange 35a is inserted into the guide 36. The marking member 37 is provided with a fluorescent paint on the outer peripheral surface so that the unlocked state when protruding from the guide 36 can be visually recognized from the outside. The guide 36 and the marking member 37 are formed with notches 36a and 37a at the same position, and a bell crank 39 passing through the notches 36a and 37a on a bearing 38 projecting in the marking member 37 has a long pin slit 39a. Is pinned by. The bell crank 39 is pivotally supported by a support bracket 40 erected on a bracket 33 a, and a piston rod 41 of a cylinder 31 is pivotally attached to the opposite side by a joint 43.
[0019]
In such a cylinder 31, the bearing portion 42 a of the cylinder tube 42 is pivotally supported by the support bracket 44, and the inclination can be changed with the rotation of the bell crank 39. A spring 45 is connected to the bell crank 39 on the same side as the cylinder 31, so that an urging force always acts in the contraction direction of the cylinder 31. The biasing direction is a direction in which the bell crank 39 is rotated so that the lock pin 35 is inserted into the pin hole 34. That is, the cylinder 31 is a single-acting cylinder that simply rotates the bell crank 39 in the reverse direction against the urging force of the spring 45 to provide an operation for pulling out the lock pin 35, and is a head side chamber partitioned by a piston. An adapter 46 connected to the hydraulic pump is attached to the rod side chamber, and an air breather 47 is attached to the rod side chamber.
[0020]
The lock mechanism 30 is configured to prevent the lock pin 35 inserted into the pin hole 34 from coming out in consideration of safety. The lock pin 35 can be removed from the pin hole 34 by the hydraulic pressure applied to the cylinder 31, but there is a possibility that a switch for applying the hydraulic pressure may be erroneously turned on. In particular, as shown in FIG. 5, when the lock pin 35 is pulled out with the reader 5 being stored almost horizontally, the upper leader 11 is dangerous because the free single side rotates and falls like a pendulum around the hinge 13 as a fulcrum. is there. Therefore, in the present embodiment, the lock pin 35 is configured not to be detached while the folded reader 5 is lying down.
[0021]
In order to prevent the lock pin 35 from coming off, a pendulum type stopper 51 is used. As shown in FIG. 7, the stopper 51 is pivotally supported at such a position that the rotation shaft is on the guide 36 when the reader 5 is in a stored state in which it is substantially horizontal (see FIG. 5). The stopper 51 is pivotally supported so that it can easily swing according to the inclination of the reader 5 and always hangs down in the vertical direction. Therefore, the swing portion that closes the opening of the guide 36 is larger than the portion to be pinned, and is formed in a shape that becomes a weight. The rotation range of the stopper 51 is restricted so that the opening of the guide 36 is reliably closed when the leader 5 falls down.
[0022]
As shown in FIG. 8, the stopper 51 is pivotally attached to an L-shaped fixing plate 52 fixed to the frame 58 on the upper reader 11 side so as to be sandwiched between the receiving plates 53. A stop plate 54 is fixed to the rotation direction side of the stopper 51 that closes the guide 36. Thus, the stopper 51 is pivotally supported by being sandwiched between the fixed frame 52 and the receiving plate 53, and is pivotally supported so as not to be displaced in the same direction even if it is pushed up by the lock pin 35. Further, as shown in FIG. The rotation range is limited to 90 degrees by the frame 58 and the stop plate 54 on the reader 12 side.
[0023]
Next, the operation of the lock mechanism 30 will be specifically described. As described above, when the reader 5 is in the folded state shown in FIG. 4, the pin holes 34 of the brackets 32 and 33 overlap. However, at that time, first, hydraulic pressure is applied to the cylinder 31 and rotation is given to the bell crank 39 by the extension operation. When the leader 5 is standing, the stopper 51 is positioned along the frame 58 on the lower leader 12 side as shown by the solid line in FIG. 7, so that the marking member 37 protrudes from the guide 36 without being blocked by the stopper 51. The lock pin 35 is pulled out as indicated by the two-dot chain line in FIG.
[0024]
Therefore, when the hydraulic pressure to the cylinder 31 is stopped, the bell crank 39 pulled by the spring 45 rotates, and the lock pin 35 is inserted into the bracket holes 33a and 33b and the pin hole 34 of the bracket 32. In this way, the free end side of the upper reader 11 is pinned to the lower reader 12, and the folded state of the reader 5 is maintained.
[0025]
Subsequently, the folded leader 5 is gradually tilted from the upright state by the contraction operation of the backstay cylinder 6, and is tilted as shown in FIG. At this time, since the stopper 51 always hangs down in the vertical direction, in the state shown in FIG. 4, it follows the frame 58 as indicated by a two-dot chain line, but rotates relatively as the inclination of the lower leader 12 becomes smaller. When it is tilted horizontally, the opening of the guide 36 is closed as shown by the solid line in FIG. Even if the reader 5 is tilted to the horizontal or higher, the stopper 51 does not rotate any further by hitting the stop plate 54, and can reliably close the opening of the guide 36.
[0026]
Therefore, as shown in FIG. 5, even when the pile driving machine 1 is mounted on the trailer 22 and, for example, a switch for operating the cylinder 31 is accidentally turned on during transportation, the stopper 51 opens the opening of the guide 36. Since it is closed, the marking member 37 cannot hit the stopper 51 and come out of the guide 36, and the movement of the lock pin 35 integrated with the marking member 37 is also restricted and does not come out of the pin hole 34.
[0027]
Therefore, according to the pile driving machine 1 of the present embodiment, the leader 5 is always connected to the lower leader 12 at the free end side of the upper leader 11 by the lock mechanism 30 provided with the stopper 51, and the folded state is maintained. The danger caused by the lock pin 35 being removed is eliminated. In addition, such a safe locking mechanism 30 can be achieved extremely effectively and inexpensively by using the stopper 51.
[0028]
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
[0029]
【The invention's effect】
The present invention has a pendulum type stopper that hangs down in the vertical direction and relatively rotates in accordance with the inclination of the reader, so that the rotation position when the reader is tilted almost horizontally is on the path of the lock pin. The stopper supported by the shaft prevents the lock pin from coming out of the pin hole, so a pile driver with a lock mechanism that prevents the lock pin from coming out when the leader is laid down in the folded state is provided. We were able to.
[Brief description of the drawings]
FIG. 1 is a diagram showing a pile driver in a working state in which a foldable leader is erected.
FIG. 2 is a diagram showing a pile driver in a state where a folding leader is laid down.
FIG. 3 is a view showing a pile driver in a state where the upper leader is bent.
FIG. 4 is a diagram showing a pile driver in a state where a leader is folded.
FIG. 5 is a view showing a state in which a pile driver is mounted on a trailer.
FIG. 6 is a structural diagram showing a lock mechanism.
7 is a view seen from the direction of arrow A in FIG. 6;
8 is a view seen from the direction of arrow B in FIG. 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pile driver 4 Base machine 5 Leader 6 Backstay cylinder 11 Upper leader 12 Lower leader 13 Hinge 30 Lock mechanism 31 Cylinders 32, 33 Bracket 34 Pin hole 35 Lock pin 36 Guide 37 Marking member 39 Bell crank 51 Stopper

Claims (3)

Brackets for upper and lower readers when the upper and lower readers are folded over and supported by a folding reader that supports the folding reader with the upper and lower readers connected by hinges. In a pile driving machine equipped with a lock mechanism that inserts a lock pin into the pin hole that is stacked and maintains the folded state,
The lock mechanism has a pendulum type stopper that hangs down in the vertical direction and relatively rotates in accordance with the inclination of the reader. When the reader is tilted almost horizontally, the stopper is on the path of the lock pin. A pile driving machine characterized by being positioned so as to prevent the lock pin from coming out of the pin hole. In the pile driver according to claim 1,
The lock mechanism is configured such that a protruding member formed integrally with the lock pin is inserted into the guide member, and the protruding member protrudes from the guide member when the lock pin comes out of the pin hole. A pile driving machine characterized in that the protruding portion of the guide member that protrudes from the protruding member when the is tilted substantially horizontally is blocked by the stopper. In the pile driver according to claim 1 or claim 2,
A pile driving machine comprising a stopper plate that prevents the stopper from rotating beyond the path of the lock pin.

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