JP2539020Y2 - Leader support device for pile driver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a leader support device of a pile driver that supports a leader so as to be tiltable back and forth.

[Conventional technology]

A conventional leader support device is formed with long guide holes in the front and rear horizontal direction on both left and right sides of a leader bracket provided at the front part of the body of the pile driver, and slide adapters are slidably provided in the guide holes, respectively. Insert the leader pins protruding from the left and right sides of the lower part of the reader into the slide adapter, and move the bifurcated slide fork connected to the leader pin back and forth by moving the cylinder connected to the center of the fork to extend and retract. Was tilted.

A torque stop arm extends to the rear of the slide fork, and a torque reaction force bar that abuts the torque stop arm is fixed to the leader bracket, and the torque stop arm, the torque reaction force bar, and the slide adapter are used. , The torque in the longitudinal direction of the leader, the torsional torque applied to the leader during earth auger work, and the torque of the parallel movement of the slide fork.

However, in recent years, the size of the earth auger has increased, and the torsional torque applied to the leader has increased. With the above-described structure, the torsional torque cannot be received, and the leader pin is inclined, which may hinder the pile driving accuracy. there were.

Further, Japanese Utility Model Laid-Open No. 57-133650 discloses that a long guide hole is formed in each of the left and right side surfaces of a leader bracket provided at the front part of the body of a pile driver, and a slide adapter is provided in each of the guide holes. Provided slidably, insert the leader pins protruding from the left and right sides of the lower part of the reader into the slide adapter, connect the ends of a pair of links to both ends of the leader pins, provide the reader bracket with a rotation axis parallel to the leader pins, A pair of torque levers are fixedly provided on the left and right sides of the shaft, a rear end of the link is connected to an upper end of the torque lever, and a cylinder supported by a leader bracket is connected to an arm fixedly provided at the center of the rotation shaft. The disclosed leader support device for a pile driver is disclosed.

Then, the rotation shaft receives the torque of the parallel movement of the leader, the torsional torque applied to the leader during the earth auger work, and the like via a pair of links and a pair of torque levers.

[Problems to be solved by the invention]

However, in the leader support device of the pile driver of this structure,
Since a cylinder, an arm, a rotating shaft, a pair of torque levers, and a pair of links are used, the number of parts is large, the structure is complicated, and disassembly / assembly work and maintenance are required. In addition, with respect to the torsional torque applied to the leader, since the pair of left and right links is connected to the pair of torque levers with pins, the leader is affected by the bending of the link and the clearance of the pin hole in the connection part. The amount of rotational displacement becomes larger than expected. Furthermore, since both the translational torque and the torsion torque of the reader act on the rotation axis,
Requires a certain amount of strength on the rotating shaft. In addition, a spline or keyway processing for fixing the arm is required at the center of the rotating shaft.

Accordingly, the present invention provides a leader support device for a pile driver that has a small number of component parts, is easy to disassemble, assemble and maintain, reduces the amount of rotational displacement of the leader with respect to torsional torque, and prevents the inclination of the leader pin. It is intended to provide.

[Means for solving the problem]

In order to achieve the above object, the present invention makes it possible for a leader bracket provided at the front part of the body of a pile driver to slide a leader pin protruding from the left and right sides of the lower part of the leader in a front-rear horizontal direction via a bifurcated slide fork. In the supported leader support device of a pile driver, a rotating shaft parallel to a leader pin is provided on the leader bracket, and a pair of torque levers are fixed on both left and right sides of the rotating shaft. The left and right rear ends are connected by pins, respectively, and the cylinder pivotally supported by the leader bracket is directly connected to the center of the slide fork.

[Action]

With this configuration, when the torsion torque of the leader is applied to the leader pin, the left and right sides of the slide fork tend to move in opposite directions, but this movement is directly transmitted to the rotating shaft via both torque levers as left and right opposite rotations. Then, the torque causes an axial component to be applied to the rotating shaft by this torque. Since the component is supported by the rigid leader bracket, the inclination of the leader pin can be prevented.

Further, since the cylinder, the rotating shaft, the pair of torque levers and the slide fork are used, the number of parts is small, the structure is simple, and the disassembly / assembly work and maintenance are easy. Furthermore, a rigid support structure can be obtained because the slide fork directly receives the torsional torque applied to the leader. In addition, since the rotating shaft only absorbs the torsional torque of the reader, it may be simple.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

The pile driving machine 1 has a main body 3 rotatably provided on an upper part of a lower traveling body 2, supports a lower part of the leader 5 via a leader pin 6 on a leader bracket 4 at a front part of the main body 3, and has an upper part of the leader 5 3 are supported by back stays 8, 8 provided on the outrigger arms 7, 7 at the rear, respectively.

In the leader bracket 4, guide holes 4 c and 4 d which are long in the front-rear horizontal direction are formed at front portions of the left and right side surfaces 4 a and 4 b, respectively. Are slidably supported in the front-rear direction.

The leader pins 6 are both ends 6 protruding from both sides of the reader 5.
a, 5b are respectively formed in through-holes 9c, 9c formed in left and right arms 9a, 9b formed bifurcated at the tip of the slide fork 9.
Through both ends 6a and 6b of the leader pin 6 protruding from both sides of the arms 9a and 9b.
Slide adapters 10, 10 are provided at both ends 6a, 6b, respectively, and slide adapters 10, 10 are slidably provided in the guide holes 4a, 4b.

The slide fork 9 includes arms 9a, 9b on the distal end side connected to the leader pin 6, a semicircular connecting portion 9d for connecting both arms 9a, 9b behind the leader 5, and a rearward from right and left of the connecting portion 9d. A bracket consisting of extending torque receiving arms 9e and 9f, and connecting the cylinder 11 directly to the center rear of the connecting portion 9c.
9 g are formed.

The slide fork 9 slides the outer surfaces of the arms 9a and 9b into the inner sides of the both sides 4a and 4b of the leader bracket 4, respectively, and contacts the outer surfaces of the torque receiving arms 9e and 9f with the two sides 4a and 4b of the leader bracket 4. Rotation in the left and right directions is restricted by contacting the torque reaction force receivers 4e, 4f, respectively, and the arms 9a, 9b
Slides back and forth in parallel.

At the center of the leader bracket 4, a rotating shaft 12 is provided between the side surfaces 4 a and 4 b in parallel with the leader pin 6.
Torque levers 13a and 13b are fixedly provided at the left and right ends of the slide fork 9, respectively, and the torque levers 13a and 13b and the torque receiving arms 9e and 9f of the slide fork 9 are connected by pins 14a and 14b, respectively.

In the center of the rear part of the leader bracket 4, a cylinder is provided.
A rod 11a of the cylinder 11 is connected to a bracket 9g of the slide fork 9.

With this configuration, the rod of the cylinder 11
When 11a is extended and retracted, the slide fork 9 moves back and forth, the arms 9a and 9b slide back and forth in parallel, and the both ends 6a and 6b of the leader pin 6 are slid back and forth in synchronization. It tilts back and forth with the support points of the back stays 8, 8 as fulcrums.

Further, when the torsion torque of the leader 5 during the earth auger operation is applied to the leader pin 6, a force for rotating the leader pin 6 left and right acts, and the arms 9a and 9b of the slide fork 9
One tries to move in the forward direction, the other tries to move in the rearward direction, and the torque receiving arms 9e and 9f also try to move one in the forward direction and the other in the rearward direction. However, this reverse movement is caused by the torque levers 13a, 13b connected to the torque receiving arms 9e, 9f, respectively.
The rotation is transmitted through the rotation shaft 12 as a rotation in the left and right opposite directions, and is absorbed by the rotation shaft 12.

Therefore, the torsional torque of the leader 5 is
, The inclination of the leader pin 6 can be prevented, so that excessive lateral pressure is not applied to the slide adapters 10, 10 and the leader bracket 4.

[Effects of the Invention] As described above, the leader support device of the pile driver of the present invention is:
Leader pins protruding from the lower left and right sides of the leader are slidably supported in the front and rear sides of the pile driver via a bifurcated slide fork. A cylinder having a pair of torque levers fixedly provided on both left and right sides of the rotation shaft, the torque levers and left and right rear ends of the slide fork being respectively connected by pins, and being supported by a leader bracket. Is directly connected to the center of the slide fork, so that the leader pin can be slid back and forth parallel to the left and right in a simple structure with a small number of parts such as a cylinder, a rotating shaft, a pair of torque levers and a slide fork. The torsion torque of the leader is applied to the leader pin, and the left and right sides of the slide fork try to move in the opposite direction. However, this movement is transmitted to the rotating shaft as rotation in the left and right opposite directions via both torque levers and absorbed by the rotating shaft, and the axial component force is supported by a rigid leader bracket, so the inclination of the leader pin can be reduced. Prevention and easy disassembly / assembly work and maintenance.

Also, for the torsional torque applied to the reader,
Since the slide fork is directly received, a rigid support structure can be obtained. In addition, since the rotating shaft only absorbs the torsional torque of the reader, it may be simple.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a partial cross-sectional plan view of a reader supporting device, FIG.
The figure is a perspective view, and FIG. 4 is a perspective view of a pile driver. 1 ... Pile driver, 4 ... Leader bracket, 5 ... Leader, 6 ... Leader pin, 9 ... Slide fork, 10 ...
... Slide adapter, 11 ... Cylinder, 12 ... Rotary shaft,
13a, 13b: Torque lever, 14a, 14b: Pin

Claims (1)

(57) [Scope of request for utility model registration] 1. A pile driver in which a leader pin protruding from the lower left and right sides of a leader is slidably supported in a fore-and-aft horizontal direction via a bifurcated slide fork on a leader bracket provided at a front part of the body of the pile driver. In the leader support device of the machine,
A rotation shaft parallel to the leader pin is provided on the leader bracket, and a pair of torque levers are fixedly provided on both left and right sides of the rotation shaft, and the two torque levers and the left and right rear ends of the slide fork are respectively connected by pins. And a cylinder supporting the leader bracket directly connected to a center portion of the slide fork.