JP5469982B2 - Grapple device and hydraulic excavator - Google Patents

Description

  The present invention relates to a grapple device provided with a pair of gripping members capable of gripping wood at the tip of an arm provided in a vehicle such as a hydraulic excavator, and in particular, efficiently cuts roots remaining on the ground after cutting a standing tree. The present invention relates to a grapple device having a removable function and a hydraulic excavator equipped with the grapple device.

Conventionally, as shown in FIG. 5, as the grapple device Ga, for example, a grapple device that is attached to the tip of an arm 100 swingably provided on a hydraulic excavator (not shown) as a vehicle via a swing shaft 101 is known. It has been. This includes a bracket 102 that is pivotally supported at the tip of the arm 100 and supported so as to be swingable, a frame 104 that is rotatably provided to the bracket 102 via a rotation mechanism 103, and a frame 104. A pair of gripping members 105 that can be opened / closed to be able to grip wood, a hydraulic motor 106 that is provided on the bracket 102 to rotationally drive the frame 104, and a pair of gripping members 105 that are provided on the frame 104 are driven to open / close. And a hydraulic cylinder device 107 (see, for example, Japanese Utility Model Laid-Open No. 7-23055).
The hydraulic excavator equipped with this grapple device Ga is used, for example, in a forest or the like, and swings and swivels the arm 100 and opens and closes the gripping member 105 of the grapple device Ga to collect and collect the cut wood. Various operations such as alignment, loading, loading, unloading, and branching are performed.

  By the way, in mountain forests, when gathering the harvested timber, in order to facilitate the traveling of transport vehicles and hydraulic excavators, it is necessary to form a traveling path and run it. After that, the roots (stumps) that remain on the ground may be in the way, so do the work of pulling them out (so-called “rooting” work) and leveling the roadway. Backfill and use for reinforcement. For example, in the hydraulic excavator described above, the tree root extraction operation is performed by removing the grapple device and replacing the excavation bucket. Alternatively, in the above-described hydraulic excavator, the felled root is grasped and pulled out using the grapple device itself without being replaced with the excavation bucket. Alternatively, it is also performed using a dedicated rooting machine (for example, see Japanese Patent Application Laid-Open No. 11-56129).

Japanese Utility Model Publication No. 7-23055 Japanese Patent Laid-Open No. 11-56129

However, in the method of using the same hydraulic excavator by removing the grapple device Ga and attaching the bucket, the attachments must be replaced one by one, and the work becomes complicated accordingly.
Also, in the method of grasping and pulling the felled root using the grapple device Ga itself, the working efficiency is good, but when pulling the felled root, excessive force acts on the grapple device Ga against the gripped felled root, In particular, there is a problem that the rotation mechanism 103 of the frame 104 is burdened and causes damage.
Furthermore, in the method using a dedicated rooting machine, since the dedicated machine enters the forest, there is a problem that the work becomes complicated, the working efficiency is deteriorated, and the collecting cost is increased. In addition, the movement of the extracted cutting roots cannot grip the cutting roots as in the grapple device, so the cutting roots must be rolled or held, which is inferior in work efficiency.

  The present invention has been made in view of the above-described problems, and enables the pulling of the felling root by the grapple device itself without imposing a burden on the rotation mechanism of the frame, facilitating the pulling operation, and after the pulling. It is an object of the present invention to provide a grapple device and a hydraulic excavator that can easily transport felled roots and improve work efficiency.

  A grapple device of the present invention for achieving such an object includes a bracket that is pivotally supported by a rocking shaft at a tip of an arm provided in a travelable vehicle such as a hydraulic excavator, In a grapple device comprising a frame that is rotatable with respect to a bracket via a rotation mechanism, and a pair of gripping members that can be opened and closed on the frame and can grip wood, the grapple device on the vehicle side of the bracket. The structure is such that a locking body that can be locked to a felling root remaining on the ground after cutting a standing tree is provided. The locking body can be made of a metal such as iron of the same material as the bracket, and can be additionally attached to the bracket by welding or bolting. Therefore, it is easy to manufacture and is advantageous in terms of cost.

Thereby, according to a vehicle equipped with this grapple device, for example, it is used in a forest or the like, and swings and swivels the arm and opens and closes the gripping member of the grapple device, and collects the harvested wood, aligns the mouth, Various tasks such as dredging, loading, unloading, and branching are performed.
In mountain forests, when collecting felled timber, a traveling road is formed to facilitate the traveling of transport vehicles and hydraulic excavators. At that time, standing trees are cut down. After that, the roots that remain on the ground may get in the way, so pull out this ("rooting" work) to level the road and reinforce the pulled roots back on the shoulders. Used for such purposes.

When pulling down the roots, with the gripping member closed, swing the bracket around the swinging shaft, lift the grapple device to the front of the arm, rotate the frame and position it at an appropriate position. The locking body protruding on the vehicle side is positioned downward. Then, move the arm and move the vehicle to lock the rocking body on the cutting root remaining on the ground and rock it, mainly locking the locking body on the side of the cutting root farther from the vehicle. Then, pull it to the vehicle side to cause cutting down and pull it out.
In this case, since the locking body protrudes from the bracket, the force against the cutting root acts on the arm side from the bracket, and does not act on the frame or its rotation mechanism. This prevents damage and prevents damage.
Then, when the extraction of the cutting root is completed, the grapple device is moved, the cutting root is gripped by the gripping member, and conveyed to an appropriate place. In this case, the original function of the grapple device can be demonstrated immediately after the extraction of the cutting root, so that the workability is extremely good and the work efficiency is improved compared to the case of using a special machine or replacing the attachment. The cost of work can be reduced accordingly.

  If necessary, the locking body includes a base member that is fixed to the bracket and protrudes, and an abutting member that has an end surface that stands on the upper side of the base member and can abut against a felling root. Is configured. Since the end face of the abutting member is locked to the felling root, it becomes easier to concentrate the force on the felling root, and the extraction efficiency of the cutting root is improved accordingly.

  Further, if necessary, the contact member is formed in a plate shape having a surface along a direction parallel to the axis of the swing axis of the bracket, and the end surface of the contact member is formed as a concave curve. Yes. Since the plate-shaped end surface is concavely curved, it becomes easier to abut the end surface along the outer peripheral curved surface of the cutting root, so that it becomes easier to concentrate the force on the cutting root, and the extraction efficiency of the cutting root is that much. Can be improved.

  In this case, it is effective to form the end surface of the contact member in a saw blade shape. Since the saw-toothed portion bites into the felled root, the locking is surely performed, so that it becomes easier to concentrate the force on the felled root, and the extraction efficiency of the felled root is improved accordingly.

  Moreover, it is set as the structure which made the said latching body detachable with respect to the said bracket as needed. The locking body is worn by use. In this case, the locking body can be removed and a new locking body can be attached and replaced. Moreover, it can replace | exchange for what changed the shape of the contact member, and versatility increases.

  And this invention exists in the hydraulic excavator carrying said grapple device. According to this hydraulic excavator, the same operations and effects as described above can be achieved.

According to the present invention, at the time of pulling out the felling root, the grapple device is lifted to the front side of the arm, the locking body is positioned downward, the arm is moved and the vehicle is moved, and the locking body remains on the ground. Locking and rocking the felling root, the locking body is mainly locked to the side of the cutting root farther from the vehicle, and it can be pulled out by pulling it toward the vehicle. In this case, since the locking body protrudes from the bracket, the force against the cutting root acts on the arm side from the bracket, and does not act on the frame or its rotation mechanism. It is possible to prevent damage from being caused.
Moreover, when the extraction of the cutting root is completed, the grapple device can be moved, the cutting root can be gripped by the gripping member, and transported to an appropriate place. For this reason, the original function of the grapple device can be demonstrated immediately after the extraction of the cutting roots, so that the workability is extremely good and the working efficiency is improved compared to the case of using a dedicated machine or replacing the attachment. The cost of work can be reduced accordingly.
Further, the locking body can be made of a metal such as iron of the same material as the bracket, and can be additionally attached to the bracket by welding or bolting. Therefore, it is easy to manufacture and is advantageous in terms of cost.

It is a perspective view which shows the grapple device which concerns on embodiment of this invention. It is a figure which shows the grapple apparatus which concerns on embodiment of this invention, (a) is a top view, (b) is a front view. It is a side view which shows the grapple apparatus which concerns on embodiment of this invention. It is process drawing which shows the hydraulic excavator carrying the grapple apparatus which concerns on embodiment of this invention with an example of the drawing-out work process of a felling root. It is a figure which shows an example of the conventional grapple device.

Hereinafter, a grapple device according to an embodiment of the present invention and a hydraulic excavator as a vehicle on which the grapple device is mounted will be described in detail with reference to the accompanying drawings.
As shown in FIGS. 1 to 4, a hydraulic excavator S (FIG. 4) according to an embodiment of the present invention includes a vehicle body 1 provided with a crawler type traveling body 2, and the vehicle body 1 via a turning mechanism 3. A revolving body 4 that is pivotably attached, an arm 5 that is pivotably attached to the revolving body 4, and a grapple device G according to an embodiment of the present invention that is mounted on the tip of the arm 5 are provided. ing. The arm 5 is provided on the swinging body 4 so as to be swingable up and down and is driven to swing by a hydraulic cylinder, and the arm 5 is provided at the tip of the boom 5a so as to swing up and down and is driven to swing by a hydraulic cylinder. It is comprised from the arm 5b.

  A grapple device G according to an embodiment of the present invention is attached to the tip of an arm 5 so as to be swingable around a swing shaft 6 and is swing-driven by a hydraulic cylinder device 8 via a link mechanism 7. A metal bracket 10, a metal frame 12 such as iron provided to be rotatable via a rotation mechanism 11 around a rotation shaft 11 a in a direction perpendicular to the swing shaft 6 with respect to the bracket 10; A pair of metal gripping members 13 such as iron that can be opened and closed on the frame 12 and can hold wood, a hydraulic motor 14 that is provided on the bracket 10 and that rotates the frame 12, and a grip that is provided on the frame 12. And a hydraulic cylinder device 19 that opens and closes the member 13 synchronously.

  Each gripping member 13 includes a pair of fingers 16 rotatably provided on the frame 12 and spaced apart from each other by a predetermined interval, and an erection rod 17 laid between the tips of the fingers 16. Sometimes the lower side of the frame 12 is opened, and the fingers 16 of one gripping member 13 are positioned inside the fingers 16 of the other gripping member 13 when each gripping member 13 is closed.

And in this grapple apparatus G, the locking body 20 which can be locked to the cutting root R which remained on the ground after felling the standing tree is protrudingly provided on the hydraulic excavator S side of the bracket 10. The locking body 20 is made of a metal such as iron made of the same material as the bracket 10.
Specifically, the bracket 10 has a surface on the side of the excavator S that is parallel to the axis of the swing shaft 6 of the bracket 10 and is perpendicular to the rotation axis 11a of the bracket 10. The substrate 21 is fixed by welding, and the locking body 20 is detachably fixed to the substrate 21.

  The locking body 20 is a plate-like base member 22 that is fixedly projected by surface bonding to the substrate 21 of the bracket 10, and an end face 23 that is erected on the upper side of the base member 22 by welding and can contact the felling root R. And an abutting member 24 having the structure. The contact member 24 is formed in a plate shape having a surface along a direction parallel to the axis of the swing shaft 6 of the bracket 10, and is erected in a direction perpendicular to the base member 22. Further, the end surface 23 of the contact member 24 is formed in a concave shape and a saw blade shape.

  Further, the base member 22 of the locking body 20 can be attached to and detached from the bracket 10 by four sets of bolts 25 and nuts 26. In the locking body 20 configured as described above, a metal such as iron of the same material as that of the bracket 10 is used, and a substrate 21 is provided on the bracket 10 by welding or the like. Since it can be attached, it is easy to manufacture and advantageous in terms of cost.

Therefore, the hydraulic excavator S equipped with this grapple device G is used in, for example, forests, and the arm 5 is swung and swiveled, and the gripping member 13 of the grapple device G is opened and closed by the hydraulic cylinder device 19 and felled. Various operations such as lumber gathering, culling, loading, loading, unloading and branching are performed.
In mountain forests, when collecting felled timber, the excavator S is made to run in order to facilitate the running of the excavator S. In this case, the ground is cut after standing trees. The remaining roots R may become a hindrance, so pull out this ("rooting" work) to level the road and refill the extracted roots R on the shoulders for reinforcement. Used for etc.

  At the time of extracting the cutting root R, for example, as shown in FIG. 4, the bracket 10 is swung around the swing shaft 6 with the gripping member 13 closed, and the grapple device G is moved to the front side of the arm 5. , And the frame 12 is rotated to be positioned at an appropriate position, and the locking body 20 protruding from the vehicle side of the bracket 10 is positioned downward (FIG. 4A). Then, the arm 5 is moved and the hydraulic excavator S is moved so that the end surface 23 of the contact member 24 of the locking body 20 is locked to the side of the cutting root R remaining on the ground on the side farther from the vehicle, and then this cutting is performed. The root R is pulled toward the hydraulic excavator S side, and the felled root R is rocked to cause it to be pulled out (FIG. 4B). At this time, the rotational position of the frame 12 is not limited to the position shown in FIG. 4, and the cutting root can be extracted at any rotational position.

  In this case, since the locking body 20 protrudes from the bracket 10, the force against the cutting root R acts on the arm 5 side from the bracket 10, and does not act on the frame 12 or the rotation mechanism 11 thereof. As a result, the rotating mechanism 11 is not burdened and is prevented from being damaged. Further, since the locking body 20 locks the end face 23 of the abutting member 24 erected on the upper side of the base member 22 to the felling root R, it is easy to concentrate the force on the felling root R, and that much R drawing work efficiency is improved. Furthermore, since the end surface 23 of the contact member 24 is formed in a concave curve, the end surface 23 can be easily contacted along the outer peripheral curved surface of the cutting root R, and therefore, the force can be more easily concentrated on the cutting root R. Accordingly, the extraction efficiency of the cutting root R is improved. Furthermore, since the end surface 23 of the abutting member 24 is formed in a saw blade shape, this saw blade portion will bite into the felling root R, so that the locking is reliably performed. It becomes easier to concentrate the power on the cutting root R, and the extraction efficiency of the cutting root R is improved accordingly.

  When the extraction of the cutting root R is completed, the grapple device G is moved, the cutting root R is gripped by the gripping member 13, and conveyed to an appropriate place (FIG. 4 (c)). In this case, since the original function of the grapple device G can be exhibited immediately after the cutting root R is pulled out, the workability is extremely good and the work efficiency is higher than when a dedicated machine is used or the attachment is replaced. In addition to being improved, the cost of work can be reduced accordingly.

  Further, although the locking body 20 is worn by use, the locking body 20 is detachable from the bracket 10 by the bolt 25 and the nut 26. In this case, the bolt 25 and the nut 26 are loosened. Then, the locking body 20 can be removed, the new locking body 20 can be attached, the bolt 25 and the nut 26 can be tightened again, and replaced. Moreover, it can replace | exchange for what changed the shape of the contact member 24, and versatility increases.

  In the grapple device G according to the above embodiment, the shape of the locking body 20 is not limited to that described above, and may be changed as appropriate. Further, the vehicle is not limited to the hydraulic excavator S described above, and may be applied to any vehicle such as a hydraulic excavator of a type in which a work arm extends. Furthermore, the shape of the gripping member of the grapple device is not limited to the above-described type, and any type of gripping member may be used, for example, one of the gripping members formed into a bucket shape. Furthermore, the present invention may be applied to an attachment having a turning drive mechanism such as a splitter provided with a finger as a gripping member that breaks wood, and may be applied as appropriate.

DESCRIPTION OF SYMBOLS S Excavator G Grapple device 1 Car body 2 Traveling body 3 Turning mechanism 4 Turning body 5 Arm 5a Boom 5b Working arm 6 Swing shaft 7 Link mechanism 8 Cylinder device 10 Bracket 11 Rotating mechanism 11a Rotating shaft 12 Frame 13 Holding member 14 Hydraulic motor 19 Hydraulic cylinder device R Cutting root 20 Locking body 21 Substrate 22 Base member 23 End surface 24 Contact member 25 Bolt 26 Nut

Claims (6)

A bracket that is pivotally supported by a swing shaft at a tip of an arm provided in a travelable vehicle, is supported so as to be swingable, a frame that is rotatably provided to the bracket via a rotation mechanism, and In a grapple device provided with a pair of gripping members that can be opened and closed and can grip wood,
A grapple device characterized in that a locking body that can be locked to a felling root remaining on the ground after cutting a standing tree is provided on the vehicle side of the bracket.   The locking body includes a base member that is fixed to the bracket and protrudes, and an abutting member that has an end surface that is erected on the upper side of the base member and can abut against a felling root. The grapple device according to claim 1.   3. The contact member is formed in a plate shape having a surface along a direction parallel to an axis of a swing axis of the bracket, and an end surface of the contact member is formed in a concave shape. The grapple device described.   4. The grapple device according to claim 3, wherein an end face of the contact member is formed in a saw blade shape.   The grapple device according to any one of claims 1 to 4, wherein the locking body is detachable from the bracket.   A hydraulic excavator comprising the grapple device according to any one of claims 1 to 5.

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