JP2635827B2 - Arm type working machine with guide sheave - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work attachment such as a vibratory hammer or an auger rotary drive attached to a tip of an arm through a mounting shaft, and a wire from a winch is hung from a tip of the arm via a guide sheave. The present invention relates to an arm-type working machine adapted to be used.

[0002]

2. Description of the Related Art As a conventional arm type working machine of this kind,
For example, the one shown in FIG. 8 is known. This shows a pile driver using a hydraulic excavator as a base machine. A hydraulic excavator body 1 includes a boom (first arm) 2a, an arm 2b, and an extension arm 2c (these are the second arm).
(Which constitute an arm) are sequentially connected, and these can be rotated by hydraulic cylinders 7a to 7c, respectively. At the tip of the extension arm 2c, a vibratory hammer (work attachment) 5 having a vibrating device is attached to a mounting shaft 6
The pile 3 such as a sheet pile or H copper is gripped by the chuck device 5a of the vibratory hammer 5. In this state, the vibrating device provided on the vibratory hammer 5 is operated, and each arm 2 is moved by the hydraulic cylinders 7a to 7c.
The pile 3 is driven into the ground while the vibrohammer 5 is lowered vertically by operating a, 2b and 2c. In addition, the winch 4 includes, for example, the extension arm 2 for mounting the pile 3 on the chuck device 5a and performing a cargo handling operation.
c and the extension arm 2
A guide sheave 10 is attached to the front end of c through a bracket 9 so as to protrude forward. Then, the wire 11 fed by the winch 4 is connected to the guide sheave 10.
, The tip of the wire 11 is hung on a lifting bracket 12 fixed to the upper part of the pile 3 and lifted. In this state, the winch 4 is remotely operated to open the upper end of the pile 3 at the lower opening of the chuck device 5a. Then, the pile 3 is gripped by remotely operating a hydraulic cylinder (not shown) of the chuck device 5a. Thereafter, the above-mentioned pile driving operation is performed.

[0003]

However, when the pile to be gripped is, for example, a long pile 3 shown by a solid line and a short pile 3A shown by a two-dot chain line, the boom 2a and the arm 2 are used.
b, since the posture of the extension arm 2c is different as shown in the figure, in the structure in which the guide sheave 10 protrudes forward of the vibrator hammer 5 as described above, the width of the projection sheave forward of the guide sheave 10 from the mounting shaft 6 of the vibrator hammer 5. L1 and L2 are different, and the support point of the pile by the wire 11 is different. For this reason, every time the pile is suspended, it is necessary to change the suspension posture according to the length of the pile in accordance with the protrusion widths L1 and L2 of the guide sheave 10, and there is a problem that the working efficiency is poor. Further, even when a pile of the same length is hung, if the posture of the extension arm 2c is changed, the projection width L1 of the guide sheave 10 is different, so that the same problem as described above occurs. In order to solve such a problem, the guide sheave 10 is attached to the extension arm 2c so as to be able to descend, as in, for example, the one disclosed in Japanese Utility Model Publication No. Sho 63-28997, and the extension arm is used when the pile is suspended. It is also conceivable to change the projecting position of the guide sheave 10 forward according to the posture of 2c. However, in this case, every time the posture of the extension arm 2c is different, the position of the guide sheave 10 must be adjusted to a suitable position and the work of hanging the pile 3 must be performed, which complicates the work. The above problems also occur when the auger rotary drive is hung from the tip of the extension arm 2c via the mounting shaft 6 and the upper end of the auger screw is suspended in the auger rotary drive.

[0004] It is an object of the present invention to keep the forward projection width of the guide sheave constant without any operation, regardless of the posture of the first and second arms, and to suspend a pile or the like on the work attachment. It is an object of the present invention to provide an arm-type working machine having a guide sheave that can easily and quickly perform a work such as insertion work.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1 showing an embodiment, the present invention is directed to a first arm 2a rotatably provided on a work machine main body 1 and a first arm 2a.
Is rotatably provided at the tip of the mounting shaft 6 (FIG. 2).
And a guide sheave 10A rotatably provided at the tip of the second arm 2c for vertically hanging the tip of the wire 11 fed from the winch 4. It is applied to an arm type working machine provided with And guide sheave 1
0A is mounted eccentrically by a predetermined amount on the side of the distal end of the second arm 2c substantially coaxially with the attachment mounting shaft 6, thereby solving the above problem. FIG.
The diameter of the guide sheave 10A is determined so that the wire 11 is suspended in front of the work attachment 5 as shown in FIG. In the invention of claim 3, the amount of eccentricity is determined so that the work attachment 5 and the wire 11 hanging from the guide sheave 10A do not interfere with each other. According to the invention of claim 4, the winch 4 is attached to the second arm 2c provided with the guide sheave 10A, and the wire 11 wound around the guide sheave 10A is
A is further provided on the attachment side at a position away from the wire A, and the base end portion is rotatably supported by a shaft. The wire stopper 30 further includes a wire stopper 30 in response to a decrease in the sheave winding angle θ of the wire 11. Are configured to rotate with respect to the second arm 2c. The invention of claim 5 is
The winch 4 is attached to the second arm 2c provided with the guide sheave 10A, and the attachment attachment shaft 6
And a wire detachment stopper 30 rotatably supported around a rotation shaft 10a substantially parallel to the wire. The wire detachment stopper 30 has a blocking portion for preventing the wire 11 wound around the guide sheave 10A from coming off from the guide sheave 10A on the attachment side and a blocking portion opposite to the blocking portion with the rotating shaft 10a therebetween. The provided weight portion 36
In accordance with the rotation of the second arm 2c, the blocking portion and the weight portion are always rotated around the rotation shaft 10a so as to maintain the posture in which the weight is balanced. According to the invention of claim 6, as shown in FIG. 7, the winch 4 is attached to an arm other than the second arm 2c provided with the guide sheave 10A or the work machine main body 1, and the wire 11 from the winch 4 to the guide sheave 10A. A first wire stopper 20 provided at a position where the wire is wound and whose base end is rotatably supported, and a wire provided at a position away from the guide sheave 10A on the attachment side, and the base end is rotatable. And a second wire stopper 30 pivotally supported in a direction in which the first and second wire stoppers 20 and 30 approach each other in response to a decrease in the sheave winding angle θ of the wire 11. It is configured to do so.

[0006]

(1) Since the guide sheave 10A is mounted substantially eccentrically on the side of the tip end of the second arm 2c by a predetermined amount and coaxially with the attachment mounting shaft 6, the guide sheave 10A can be set in the posture of the extension arm 2c. Regardless, the protrusion width L1 of the guide sheave 10A, that is, the support point of the pile 3 by the wire 11 is always constant without performing any operation. (2) Since the diameter of the guide sheave 10A is determined so that the wire 11 hangs in front of the work attachment 5, the wire 1
1 and the work attachment 5 do not come into contact with each other. (3) The guide sheave 1 so that the work attachment 5 does not interfere with the wire 11 hanging from the guide sheave 10A.
Since the eccentric amount is set to 0A, the wire 11 and the work attachment 5 do not come into contact with each other. (4) According to the fourth aspect of the present invention, the winch 4 is attached to the second arm 2c provided with the guide sheave 10A. The wire 1 is rotated with respect to the arm 2c.
1 can be prevented from coming off from the guide sheave 10A without undesirably coming into contact with the come-off stopper 30. (5) The wire detachment stopper 30 is rotated around the rotation shaft 10a so that the blocking portion and the weight portion always keep the weight balance in accordance with the rotation of the second arm 2c. With this configuration, by appropriately setting the weight of the weight, the contact of the wire 11 with the stopper 30 can be further prevented. (6) The invention according to claim 6, in which the winch 4 is attached to an arm other than the second arm 2c provided with the guide sheave 10A or to the work machine main body 1, responds to the decrease in the sheave winding angle θ of the wire 11. First and second wire stoppers 2
Since the wires 0 and 30 rotate in the directions approaching each other, the wire 11 can be prevented from coming off from the guide sheave 10A without undesirably coming into contact with the stoppers 20 and 30, as described above. In the sections of the means for solving the problems described above and the operation of the present invention, the drawings of the embodiments are used to make the present invention easy to understand, but the present invention is not limited to the embodiments. Not something.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. The same parts as those in FIG. 8 are denoted by the same reference numerals. FIG.
Is a side view of the pile driver, and FIGS. 2 to 4 are a front view, a plan view and a side view showing the vicinity of the tip end of the extension arm 2c. As shown in FIGS. 2 and 3, the bracket 5c of the vibratory hammer 5 is attached to the distal end of the extension arm 2c via a horizontal mounting shaft 6, a bracket 5f and a vertical axis 5b so as to be able to adjust the rotational position. A vibration exciter 5e composed of a motor, an eccentric weight and the like is attached to the bracket 5c via a vibration absorbing elastic member 5d. Further, a chuck device 5a composed of a hydraulic cylinder or the like for gripping the pile 3 is attached to a lower portion of the exciter 5e.

Reference numeral 10A denotes a guide sheave for hanging the wire 11 fed from the winch 4 vertically downward, and a shaft 14 of the guide sheave 10A is located on the side of the mounting shaft 6 via a bracket 15 and at the side of the mounting shaft 6. And is fixed to the extension arm 2c substantially coaxially. That is, the shaft 14
Is fixed to the front part of the bracket 15 in a cantilever manner, and a mounting shaft 16 fixed to the rear part of the bracket 15 is fitted to a cylindrical body 17 penetrated and welded to the extension arm 2 c, and is stopped by a pin 18. And it is fixed by retaining. Here, as shown in FIG.
The amount of eccentricity of the extension arm 2c with respect to the center is determined so that the side surface of the vibratory hammer 5 does not contact the wire rope 11.

In FIGS. 3 and 4, reference numerals 20 and 30 denote first and second wire detachment stoppers. The first wire detachment stopper 20 is rotatable at one end to a shaft 14 with a guide sheave 10A interposed therebetween. A pair of plate members 21, each of which is pivotally supported,
22 and a rod 2 having both ends fixed to plate members 21 and 22
3 and a rod 24 whose both ends are detachably supported by the plate members 21 and 22, and a roller 25 is externally inserted into the rod 24. As shown in FIG. 5, the second wire detachment stopper 30 includes a pair of plate members 31 each having one end rotatably supported on the shaft 14 with the guide sheave 10 </ b> A interposed therebetween, as described above.
32, a rod 3 having both ends fixed to the plate members 31, 32
3 and a rod 34 whose both ends are detachably fixed to the plate members 31 and 32, and a roller 35 is externally inserted into the rod 34.

A weight 36 is attached to the winch side end of the plate member 31 of the second wire stopper 30 so that the weight of both ends of the second wire stopper 30 with the shaft 14 interposed therebetween. Therefore, the second wire stopper 30 maintains the illustrated posture regardless of the posture of the extension arm 2c.

The wire 11 from the winch 4 is wound around the guide sheave 10A after being passed between the rod 23 of the wire stopper 20 and the roller 25, so that the corner 20a of the wire stopper 20 is connected to the wire 11a. Is located at a position where it is wound around the guide sheave 10A. Guide sheave 1
The wire 11 wound around 0A is a wire stopper 30.
After being passed between the rod 33 and the roller 35 of the stake 3, the tip is vertically suspended, and the tip thereof is hooked on the lifting bracket 12 of the pile 3. As a result, the corner 30a of the wire stopper 30 is located at a position where the wire 11 is separated from the guide sheave 10A.

In the pile driving machine configured as described above,
When the stake 3 is gripped by the chuck device 5a of the vibratory hammer 5, the tip of the wire 11 is attached to the lifting bracket 12 of the stake 3.
The upper end of the pile 3 is inserted from the lower opening of the chuck device 5a and gripped by remotely operating the winch 4. As described above, the guide sheave 10A is
Attachment shaft 6 of vibro hammer 5 via bracket 15
The extension width L1 of the guide sheave 10A (FIG. 8), that is, the support point of the pile 3 by the wire 11 performs any operation regardless of the posture of the extension arm 2c. Therefore, when the hanging posture of the arm is changed according to the length of the pile 3, it is not necessary to change the posture of the movable sheave as in the prior art Japanese Utility Model Publication No. Sho 63-28997. Although the guide sheave 10A is provided substantially coaxially with the mounting shaft 6 of the vibratory hammer 5, it is not necessary to remove the guide sheave 10A when the vibratory hammer 5 is attached or detached.

Further, in this embodiment, since the first and second wire stoppers 20 and 30 are provided, the following effects can be obtained. Now, the rotation axis X (FIG. 1) of the extension arm 2c and the rotation center of the guide sheave 10A (the shaft 14)
A center line 10a is defined as a reference line L, and two points on the winch side and the vibratory hammer side where the wire 11 wound around the guide sheave 10A is separated from the guide sheave 10A are defined as P1 and P2, respectively. The angle between the line connecting the points 10a and P1 and the reference line L is θ1,
Assuming that the angle between the line connecting 2 and the reference line L is θ2, the winding angle (sheave winding angle) θ of the wire 11 around the guide sheave 10A is represented by θ = θ1 + θ2. Is the case where the clockwise rotation is positive for θ1 and the counterclockwise rotation is positive for θ2).

When the boom 2a and the arm 2b are rotated to lower the extension arm 2c, that is, the guide sheave 10A, in a vertical direction, the posture of the extension arm 2c is changed accordingly to change the angle θ2.
Changes, and the winding angle θ decreases as the guide sheave 10A descends, that is, as the height position decreases.
In this embodiment, since the winch 4 is attached to the extension arm 2c provided with the guide sheave 10A, the angle θ1 is constant.

When the sheave winding angle θ is small, the wire 11 is easily detached from the guide sheave 10A, but the second wire detachment stopper 30 is attached to the weight 36 attached to the plate member 31 with the change in the posture of the extension arm 2c. By the action of (1), it rotates with respect to the extension arm 2c, and always keeps the illustrated posture regardless of the posture of the extension arm 2c.

Here, considering a case where the wire detachment stopper 30 is fixedly attached by, for example, welding, the wire 11 is bent by the detachment stopper 30 and undesirably comes into frictional contact with the wire 11 depending on the wrapping angle θ. However, as described above, since the wire detachment stopper 30 is made rotatable and the same posture is maintained regardless of the vertical position of the extension arm 2c as described above, the sheave winding angle θ Regardless, the wire 11 is not bent by the rod 33 of the stopper 30 and the wire 11 does not undesirably make frictional contact with the rollers 25 and 35, so that the life of the wire can be extended.

In the configuration of the above embodiment, the boom 2a
Constitutes a first arm, the arm 2b and the extension arm 2c constitute a second arm, and the vibro-hammer 5 constitutes a work attachment. Since the angle θ1 (FIG. 4) described above does not change in the above description, the first wire stopper 20 may not be provided. FIG. 6 shows an arm-type working machine according to another embodiment of the present invention, which includes four arms 2d to 2g rotated by hydraulic cylinders 7d to 7g, and has a tip arm (extension arm). An auger rotary drive 45 is connected to the tip of 2 g by a mounting shaft (not shown) instead of the vibrator hammer 5. Also in this case, when the auger screw 46 is mounted on the auger rotary driving device 45 by suspending the auger screw 46 by attaching the guide sheave 10A to the side of the mounting shaft and substantially coaxially with the mounting shaft. Can always be performed at the optimum position regardless of the posture of the arm 2g.

FIG. 7 shows another embodiment in which the winch 4 is attached to the boom 2a instead of the extension arm 2c. Further, in this embodiment, the guide sheave 10A is set so that the wire 11 is hung in front of the vibratory hammer 5.
Is larger than the above. Other configurations are shown in FIG.
This is the same as the embodiment. In the embodiment of FIG.
Is attached to the extension arm 2c, so that even if the extension arm 2c is lowered, the angle θ1
(FIG. 4) did not change, but in the case of the present embodiment, when the extension arm 2c was lowered, the angles θ1 and θ2 both changed as shown in the drawing, and the lower the position of the sheave 10, the more sheave winding was performed. θ decreases. FIG.
In the figure, the wire detaching stoppers 20, 30 are not shown.

At this time, the winch-side portion of the wire 11 rotates the first wire stopper 20 in the counterclockwise direction while rotating the roller 25 (FIG. 4), while the wire stopper 30 is in the same manner as described above. It rotates clockwise with respect to the extension arm 2c. That is, the first and second wire stoppers 20 and 3 are set in accordance with the decrease in the winding angle θ.
0 rotate toward each other. Therefore, regardless of the sheave winding angle θ (= θ1 + θ2), the wire 11 is not bent by the rods 23, 33 of the stoppers 20, 30, and the wire 11 does not undesirably frictionally contact the rollers 25, 35. The life of the wire is extended. When the winch 4 is attached to the arm 2b or the excavator main body 1, the same operation and effect as described above can be obtained.

In the embodiment described above, the first and second
The wire stoppers 20 and 30 are rotatable with respect to the shaft 14 similarly to the guide sheave 10A, but may be rotatably provided at a portion other than the shaft 14. Further, the description has been given of the one having three or four arms. However, the present invention can be applied to the one having two or five or more arms. Further, for example, when the wire 11 is used for hanging a concrete pile in a vertical hole, the same effect as described above can be obtained.

[0021]

According to the present invention, the guide sheave is mounted eccentrically by a predetermined amount on the side of the distal end of the second arm substantially coaxially with the attachment mounting shaft, so that the arm can be operated without any operation. The hanging position of the wire is constant regardless of the posture of the object, the object to be suspended is always suspended at a suitable position,
The hanging operation can be easily and quickly performed. According to the second aspect of the present invention, since the diameter of the guide sheave is determined so that the wire is hung in front of the work attachment, the wire and the work attachment are prevented from coming into contact with each other. According to the third aspect of the present invention, the eccentric amount of the guide sheave is determined so that the work attachment and the wire hanging from the guide sheave do not interfere with each other, so that the wire and the work attachment are prevented from coming into contact with each other. According to the invention of claim 4, the winch is connected to the second sheave provided with the guide sheave.
In the case where the wire is attached to the arm, the wire is prevented from coming off in response to the decrease in the wire sheave winding angle.
Since the wire is rotated with respect to the arm, the wire can be prevented from coming off the guide sheave without undesirably coming into contact with the stopper, and the life of the wire can be extended. According to the fifth aspect of the present invention, the wire detachment stopper is rotated around the rotation axis such that the blocking portion and the weight portion always keep the weight balance in response to the rotation of the second arm. Therefore, by appropriately setting the weight of the weight portion, it is possible to further prevent the wire from coming into contact with the stopper. According to the sixth aspect of the present invention, in the case where the winch is attached to an arm other than the second arm provided with the guide sheave or to the main body of the working machine, the first and the second are moved in response to a decrease in the sheave winding angle of the wire. Since the second wire stoppers are rotated in the directions approaching each other, it is possible to prevent the wire from coming off the guide sheave without undesirably contacting the first and second stoppers as described above. Thus, the life of the wire can be extended.

[Brief description of the drawings]

FIG. 1 is a side view showing an appearance of a pile driver according to one embodiment of the present invention.

FIG. 2 is a front view showing a distal end portion of an extension arm.

FIG. 3 is a plan view showing a distal end portion of an extension arm.

FIG. 4 is a side view showing a distal end portion of the extension arm.

FIG. 5 is a sectional view taken along line AA of FIG. 4;

FIG. 6 is a side view of an arm type working machine showing another embodiment of the present invention.

FIG. 7 is a diagram illustrating still another embodiment of the present invention.

FIG. 8 is a side view for explaining a problem of the conventional pile driver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic excavator main body 2a Boom 2c Arm 2d Extension arm 3 Pile 4 Winch 5 Vibro hammer 5a Chuck device 6 Attachment mounting shaft 7a-7c Hydraulic cylinder 10A Guide sheave 11 Wire 14 Guide sheave shaft 15 Bracket 20 First wire stopper 30 Second 45 Auger Rotary Drive 46 August Cru

Claims (6)

(57) [Claims] 1. A first device rotatably provided on a work machine main body.
An arm, and a second arm, which is rotatably provided at a tip of the first arm and to which a working attachment is attached via a mounting shaft at the tip.
An arm and a guide sheave rotatably provided at a tip of the second arm and vertically hanging a tip of a wire fed from a winch, wherein the guide sheave is attached to the attachment mounting shaft; An arm-type working machine having a guide sheave, which is substantially coaxial and eccentrically attached to a side of a tip portion of the second arm by a predetermined amount. 2. The arm type working machine having a guide sheave according to claim 1, wherein the diameter of the guide sheave is determined so that the wire is hung in front of the work attachment. 3. The arm type working machine having a guide sheave according to claim 1, wherein the amount of eccentricity is determined so that the work attachment and a wire hanging down from the guide sheave do not interfere with each other. 4. The winch is attached to a second arm provided with the guide sheave, and a wire wound around the guide sheave is provided at a position away from the guide sheave on the attachment side, and the base end portion is rotatable. The invention further comprises a shaft-supported wire detachment stopper, wherein the wire detachment stopper is rotated with respect to the second arm in response to a decrease in the sheave winding angle of the wire. An arm-type working machine having the guide sheave according to any one of Items 1 to 3. 5. A wire detaching stopper which is attached to the second arm provided with the guide sheave and which is rotatably supported about a rotation axis substantially parallel to the attachment mounting axis. The wire detachment stopper is provided at a position where the wire wound around the guide sheave separates from the guide sheave on the attachment side, and is provided at a position opposite to the position where the rotation shaft is interposed. A weight portion, and in accordance with the rotation of the second arm, the blocking portion and the weight portion always rotate around the rotation axis so as to maintain a weight-balanced posture. An arm type working machine having the guide sheave according to any one of claims 1 to 3. 6. The winch is attached to an arm other than the second arm provided with the guide sheave or a working machine main body, and is provided at a position where a wire from the winch is wound around the guide sheave, and a base end is provided. First rotatably supported
And a second wire stopper provided at a position where the wire is separated from the guide sheave on the attachment side, and a base end portion of which is rotatably supported at the base end, and a sheave winding angle of the wire. In response to the decrease in
The arm type working machine having a guide sheave according to any one of claims 1 to 3, wherein the wire detaching stoppers are configured to rotate in directions approaching each other.