JP3608159B2 - Pile sheave top sheave - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a top sheave of a pile driving machine, and more particularly to a top sheave of a pile driving machine in which an auxiliary suspension sheave is rotatably provided in a horizontal direction.
[0002]
[Prior art]
The top sheave of the pile driver is provided with a main sheave that suspends working devices such as an auger drive device and a hammer, and an auxiliary sheave for suspending suspended loads such as augers and piles on the working device. At the time of adding auger rods or burying ready-made piles, suspend the rods or piles with wire ropes hung around the auxiliary suspension sheave, and attach the rods or piles to the suspension load attachment center of the work equipment Do work. At this time, there may be cases where the site is small or it is not desired to move the working device from the center of the drilling hole, so the auxiliary suspension sheave can be rotated horizontally without turning the pile driving machine main body to extend the center of the drilling hole. There are rods and piles that are hung from the side at the load attachment center of the work equipment located on the line.
[0003]
As shown in FIG. 7, as the horizontal rotation auxiliary suspension sheave, a base frame 31 fixed to the upper end of the reader and a support shaft 32 in the leader axial direction on the reader front side of the base frame 31. Some have a front end frame 33 provided to be rotatable in a horizontal direction and a hydraulic cylinder 34 as an actuator for rotating the front end frame 33.
[0004]
[Problems to be solved by the invention]
However, in the above-described structure, the rod of the hydraulic cylinder disposed on one side of the tip frame is expanded and contracted to rotate the tip frame 90 degrees to the left and right. However, the cylinder force differs between the rod expansion side and the contraction side. The lateral pulling force due to is different between left rotation and right rotation. In addition, since the tip frame is rotated from the rod tip of the hydraulic cylinder via the link, the tangential force applied to the tip frame varies depending on the link angle, and the lateral pulling force and the pivot speed of the tip frame differ depending on the pivot angle. There was a problem in operability. Furthermore, when the distance between the support shaft and the sheave of the tip frame sheave is increased, a cylinder with a long rod stroke is required, and the top sheave becomes large. In addition, when the link ratio is increased and the rod stroke is shortened, the tangential force of the end frame is reduced and a sufficient force cannot be applied during lateral pulling.
[0005]
Accordingly, the present invention can make the lateral pulling load of the front end frame uniform in both the left and right rotations and can make the rotation speed constant, and the structure is simple even when the distance from the support shaft to the suspension core of the sheave of the front end frame is long. The purpose is to provide a top sheave for a downsized pile driver.
[0006]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention is provided with a base frame fixed to the upper end of the reader, and rotatably provided in the reader front side of the base frame in a horizontal direction by a support shaft in the reader axial direction. In a top sheave of a pile driving machine having a tip frame and an actuator that rotates the tip frame, a hydraulic motor is mounted on the base frame as an actuator with its output shaft facing upward , and the hydraulic motor A brake valve for holding a lateral pulling load of the frame is provided, and a sprocket provided on the output shaft as a power transmission mechanism for rotating the tip frame between the output shaft of the hydraulic motor and the tip frame and the support shaft It is characterized by interposing a provided sprocket and a chain hung around both sprockets .
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on an embodiment shown in the drawings. A pile driving machine 4 in which a hammer 3 can be moved up and down on a leader 2 erected on the front of a base machine 1 includes a top sheave 5 on the top of the leader 2 and a base frame 6 fixed on the upper end of the leader 2. The front frame of the base frame 6 is provided with a front end frame 8 provided so as to be rotatable in the horizontal direction by a support shaft 7 in the direction of the leader axis, and the front end frame 8 is rotated on the base frame 6. A hydraulic motor 9 is mounted as an actuator with its output shaft facing upward.
[0008]
Between the output shaft of the hydraulic motor 9 and the tip frame 8, a sprocket 11 provided at the tip of the output shaft as a power transmission mechanism for rotating the tip frame 8, a sprocket 10 fixed to the support shaft 7, and both A chain 12 hung around the sprockets 10 and 11 is interposed . A gear may be fixed on the support shaft 7, and a power transmission mechanism using a gear may be interposed between the gear at the tip of the output shaft of the hydraulic motor 9.
[0009]
The base frame 6 is provided with a vertical sheave 13 at the rear and a pair of left and right guide rollers 14 and 14 in the vicinity of the upper support shaft 7. The front end frame 8 is provided with a vertical sheave 15 at the front end and a stopper 16 that comes into contact with the base frame 6 when rotated 90 degrees left and right on the upper surface.
[0010]
A wire rope 18 for suspending a pile 17 to be mounted on the hammer 3 passes from a winch of the base machine 1 through a sheave 19 at the front of the base machine 1, to the vertical sheave 13, between the guide rollers 14, 14, and to the vertical sheave 15. It is hung around.
[0011]
With this configuration, the tip frame 8 is rotated 90 degrees left and right by the rotation of the hydraulic motor 9 when the pile 17 is suspended. By rotating the tip frame 8 with the hydraulic motor 9, the tip frame 8 can be turned with a uniform tangential force regardless of the angle, so that the lateral pulling load of the tip frame 8 becomes uniform regardless of the turning angle. The lateral pulling load is held by the brake valve of the hydraulic motor 9. Further, the rotation speed of the distal end frame 8 is constant regardless of the rotation angle. Furthermore, even if the distance between the vertical sheave 15 of the tip frame 8 that is the suspension core from the support shaft 7 is long, the structure is simpler and smaller than that using a hydraulic cylinder.
[0012]
【The invention's effect】
As described above, the top sheave of the pile driving machine of the present invention is provided with a tip frame that can be rotated horizontally on the base frame at the upper end of the leader, and the tip frame is rotated by a hydraulic motor mounted on the base frame. Therefore, it can be rotated with a uniform tangential force regardless of the angle, the lateral pulling load of the front end frame is uniform regardless of the rotation angle, and the rotation speed is constant. Further, even if the distance between the suspension core and the rotation center is long, the structure is simpler than that using a hydraulic cylinder and the size can be reduced.
[Brief description of the drawings]
[Fig. 1] Side view of top sheave [Fig. 2] Side view of pile driver [Fig. 3] Plan view of top sheave [Fig. 4] Plan view of tip frame rotated 90 degrees to the right [Fig. ] Side view of the tip frame rotated 90 degrees to the right [FIG. 6] Plan view of the tip frame rotated 90 degrees to the right [FIG. 7] The tip frame is rotated by a conventional hydraulic cylinder Top view of top sheave [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Base machine, 2 ... Leader, 4 ... Pile driver, 5 ... Top sheave, 6 ... Base frame, 7 ... Support shaft, 8 ... Tip frame, 9 ... Hydraulic motor, 10 ... Sprocket, 11 ... Sprocket, 12 ... chain

Claims (1)

A base frame fixed to the upper end of the reader, a tip frame provided on the leader front side of the base frame so as to be pivotable in the horizontal direction by a spindle in the leader axis direction, and an actuator for pivoting the tip frame In the top sheave of the pile driving machine having the above structure, a hydraulic motor is mounted on the base frame as an actuator with its output shaft facing upward , and the hydraulic motor includes a brake valve that holds a lateral pulling load of the tip frame. , between the output shaft and the front end frame of the hydraulic motor, a chain wound around the sprockets and sprockets provided on the sprocket and the support shaft provided on the output shaft as a power transmission mechanism for rotating the distal frame The top sheave of a pile driver characterized by interposing

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