JP4567572B2 - Grapple device and hydraulic excavator - Google Patents

Description

  The present invention relates to a grapple device provided with a tongue capable of gripping various objects at the tip of an arm that is swingably provided on a working machine such as a hydraulic excavator, and a hydraulic excavator equipped with the grapple device.

Conventionally, as this type of grapple device, one that is attached to the tip of an arm that is swingably provided on a hydraulic excavator as a working machine is known. This includes a bracket attached to the tip of the arm, a frame provided rotatably with respect to the bracket, and a pair of tongues provided on the frame so as to be opened and closed.
The hydraulic excavator equipped with this grapple device is used in, for example, forests, and swings and swivels the arm and opens and closes the tongs of the grapple device. Various tasks such as dredging, loading, unloading, and branching are performed.

  By the way, in a forest, afforestation is carried out on the ground after logging, and afforestation work generally involves excavating a seedling hole for planting a seedling in the ground, and then filling the seedling hole with a seedling. When excavating the seedling hole, it is convenient if the above-mentioned hydraulic excavator can easily enter the forest, so it is convenient to remove the grapple device at the tip of the arm of the hydraulic excavator. The excavator attachment is attached.

As such an excavator attachment, for example, a technique disclosed in, for example, Japanese Patent Application Laid-Open No. 2003-3778 is known.
As shown in FIG. 10, the excavator attachment K includes a bracket 102 attached to the tip of an arm 101 of a hydraulic excavator 100, an auger 103 for ground excavation, and a hydraulic motor that is provided on the bracket 102 and rotationally drives the auger 103. And a rotational drive mechanism 104 provided with
When using the excavator attachment K, the grapple device (not shown) at the tip of the arm 101 is removed, and the bracket 102 of the excavator attachment K is attached to the tip of the arm 101.

Japanese Patent Laid-Open No. 2003-3778

  By the way, in the conventional excavator attachment K, when using this, the grapple device must be removed and replaced with the arm 101 one by one, so that the change work becomes complicated and the workability is poor. was there. Further, since the excavator attachment K is provided with the rotation drive mechanism 104 different from the grapple device, there is a problem that the number of parts is increased accordingly.

  The present invention has been made in view of the above-mentioned problems, and it is possible to easily change to an excavator by attaching an auger without removing the entire grapple device, to improve the change workability, and to rotate the grapple device. It is an object of the present invention to provide a grapple device and a hydraulic excavator that can share the mechanism as an auger rotational drive mechanism and improve the utilization efficiency of the device.

  In order to achieve such an object, the grapple device of the present invention includes a bracket that is attached to the tip of an arm that is swingably provided on a work machine, a frame that is rotatably provided with respect to the bracket, and an opening and closing to the frame. In a grapple device comprising a pair of tongs provided in a manner, a rotation drive mechanism provided on the bracket for rotating the frame, and an opening / closing drive mechanism provided on the frame for opening and closing the tongue. This auger is configured to be attachable to the lower side of the frame via attachment means so that its axis is along the rotation axis of the frame.

Thereby, according to the working machine equipped with this grapple device, normally, the arm is swung and the tongue of the grapple device is opened / closed by the opening / closing drive mechanism to perform various operations such as gripping various objects. .
When trying to dig a hole in the ground, the auger is attached to the grapple device via the attachment means. In this state, the arm is appropriately swung, and the rotation driving mechanism is driven to rotate the frame. Thereby, since an auger rotates, a hole can be opened. In this case, since the auger can be rotated using the original rotation drive mechanism, that is, the rotation drive mechanism of the grapple device can be shared as the rotation drive mechanism of the auger, the utilization efficiency of the device can be improved. In addition, since the auger can be attached and easily changed to an excavator without removing the entire grapple device, the change workability can be improved.

  Further, if necessary, each of the tongues is configured to include a finger that opens a lower side of the frame when opened and forms a space communicating with the lower side of the frame when closed. A base plate fixed to the lower side of the frame, and detachably attached to the base plate, allowing the tongue to open and close, and allowing the base end of the auger to be attached and detached when the tongue is closed A holder for holding the base end of the auger; first fastening means for fastening the holder to the base plate; and second fastening means for fastening the base end of the auger to the holder. ing.

When rotating the auger, it is desirable to close the tongue so that it does not interfere with other objects or make it difficult to rotate. The auger can be easily installed in the wet state.
That is, when attaching the auger to the grapple device, first, the holder is attached to the base plate by the first fastening means with the tongue open. In this case, since the holder is attached in a state where the tongue is opened, the attachment space is widened, so that the attachment workability is improved. Next, close the tongue. In this case, since the opening and closing of the tongue is permitted, the situation where the tongue interferes with the holder is prevented.

  Then, the auger is attached to the holder by the second fastening means. In this case, if the attachment means is configured so that the base end of the auger is directly attached to the base plate, for example, when the auger and the holder are integrated, the tongue is attached to the auger after the auger is attached. The tongs cannot be closed due to interference, while in the state where the tongs are closed, the tongs are in the way, making it difficult to mount the holder or making it difficult to mount, but in the present invention, the tongs are opened. Since the base of the auger is attached to the holder in a state where the holder is firmly attached and then the tongue is closed, the attachment becomes extremely easy and the workability of the attachment is improved.

  Further, if necessary, each of the tongues is configured to include a finger that opens a lower side of the frame when opened and forms a space communicating with the lower side of the frame when closed. A base plate fixed to the lower side of the frame, and an arm portion that engages with the tongue when the tongue is closed and is pressed and held on the base plate side. When the tongue is closed, the base end of the auger is attached and detached. And a holder for holding the base end of the auger, and a fastening means for fastening the base end of the auger to the holder.

  Thereby, when attaching an auger, for example, first, a holder is joined to a base plate, and a tongue is closed. When the tongue is closed, each tongue is engaged with the arm portion of the holder, and the holder is pressed and held on the base plate side. In this case, since the holder is held by the tongue, the holder is reliably held. Then attach the auger to the holder. Therefore, the holder is firmly held by the tongue, and then the base end of the auger is attached to the holder, so that the attachment becomes extremely easy and the attachment workability is improved.

  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 grapple device and the hydraulic excavator of the present invention, it is usually possible to perform various operations such as gripping various objects by swinging the arm and opening and closing the tongue of the grapple device by the opening and closing drive mechanism. . When trying to dig a hole in the ground, the auger is attached to the grapple device via the attachment means. In this state, the arm is appropriately swung, and the rotation driving mechanism is driven to rotate the frame. Thereby, since an auger rotates, a hole can be opened. In this case, since the auger can be rotated using the original rotation drive mechanism, that is, the rotation drive mechanism of the grapple device can be shared as the rotation drive mechanism of the auger, the use efficiency of the device can be improved. . Further, since the auger can be attached and easily changed to an excavator without removing the entire grapple device, the change workability can be improved.

Hereinafter, a grapple device according to an embodiment of the present invention and a hydraulic excavator as a working machine on which the grapple device is mounted will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, a hydraulic excavator S according to an embodiment of the present invention includes a vehicle body 1 provided with a crawler type traveling body 2 and a turn mounted on the vehicle body 1 via a turning mechanism 3 so as to be turnable. A body 4, an arm 5 attached to the revolving body 4 so as to be swingable up and down, and a grapple device G according to an embodiment of the present invention mounted on the tip of the arm 5 are provided. 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. 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.

  1 to 4 show a grapple device G according to a first embodiment of the present invention. The grapple device G according to the first embodiment is attached to the tip of an arm 5 so as to be swingable around a swing shaft 6 and is swingably driven by a hydraulic cylinder. A frame 12 provided to be rotatable around a rotation axis 11 in a direction orthogonal to the swinging axis 6 of the frame, a pair of tongs 13 provided to be openable and closable on the frame 12, and a frame 12 provided to the bracket 10 to rotate. The rotary drive mechanism 14 includes a hydraulic motor, and an open / close drive mechanism 15 provided with a hydraulic cylinder (not shown) that is provided on the frame 12 and drives the tongue 13 to open and close synchronously.

  Each tong 13 includes a pair of fingers 16 that are rotatably provided on the frame 12 and are spaced apart from each other by a predetermined interval, and an erection rod 17 that is installed between the tips of the fingers 16, as shown in FIGS. 2 and 3. Thus, when each tong 13 is opened, the lower side of the frame 12 is opened, and when each tong 13 is closed, the finger 16 (a) of one tong 13 is positioned inside the finger 16 (b) of the other tong 13. In addition, a space e communicating with the lower side of the frame 12 is formed between the erection rods 17 of the tongs 13.

  In this grapple device G, as shown in FIGS. 2 to 4, the auger 20 for excavating the ground is attached to the lower portion of the frame 12 so that the axis P is along the rotation axis 11 of the frame 12. It can be attached via. The auger 20 is provided with a spiral excavation blade 22 on a rotary shaft body 21, and a cylindrical body 23 is fixed to a proximal end.

  Specifically, the attachment means 30 is attached to the lower side of the frame 12 by welding, and is detachably attached to the base plate 31. The attachment means 30 allows the tongue 13 to be opened and closed while the tongue 13 is closed. A holder 32 that holds the base end of the auger 20 while allowing the base end of the auger 20 to be attached and detached, first fastening means 33 that fastens the holder 32 to the base plate 31, and a base end of the auger 20 to the holder 32. And a second fastening means 34 for fastening.

  The holder 32 includes a cylindrical member 35 that is formed in the same manner as the cylindrical body 23, and a mounting plate 36 that is welded and fixed to the base end of the cylindrical member 35 and is surface-bonded to the base plate 31. Six bolt insertion holes 37 are formed on the outer periphery of the mounting plate 36 at intervals. The holder 32 is set to a length that prevents the installation rod 17 from interfering with the opening 13 when the mounting plate 36 is joined to the base plate 31, and when the tongue 13 is closed. The cylindrical member 35 is formed in such a size that it faces the erection rod 17 of each tongue 13 and exposes its opening downward.

  The first fastening means 33 is formed on the base plate 31 corresponding to the bolt insertion hole 37 of the mounting plate 36 and the bolt 40 inserted into the bolt insertion hole 37 formed on the mounting plate 36 of the holder 32. It is comprised with the internal thread 41 to screw. The mounting plate 36 is fixed by inserting the bolt 40 through the bolt insertion hole 37 and screwing into the female screw 41, and the holder 32 is mounted on the base plate 31.

  The second fastening means 34 includes a rod 43 inserted into the cylindrical member 35 of the holder 32 and the cylindrical body 23 of the auger 20, and a cylindrical member 35 of the holder 32 and one end of the rod 43 inserted through the rod 43. Bolts 44 inserted into the through-holes penetrating, bolts 45 inserted into the through-holes penetrating the cylindrical body 23 of the auger 20 and the other end of the rod 43 inserted therethrough, and inserted into the through-holes. And nuts 46 and 47 which are screwed into the bolts 44 and 45 to prevent the bolts 44 and 45 from coming off. In the embodiment, as shown in FIG. 2, the holder 32 and the rod 43 are opened and closed when the one end of the rod 43 is inserted into the cylindrical member 35 of the holder 32 and stopped by the bolt 44. Even so, the length of the mounting rod 17 is set so as not to interfere with the rod 43, and the other end of the rod 43 faces between the mounting rods 17 of the tongs 13 and is exposed downward when the tongue 13 is closed. It is formed in size.

Therefore, the hydraulic excavator S equipped with this grapple device G is used, for example, in a forest or the like, and swings and swivels the arm 5 and opens and closes the tongue 13 of the grapple device G by the opening / closing drive mechanism 15 and cuts the wood. Various operations such as gathering, cutting balls, aligning culverts, loading, loading, unloading, and branching are performed.
Further, for example, when afforestation is performed on the ground or the like after logging, the auger 20 is attached to the grapple device G when a seedling hole for planting a seedling is to be excavated in the ground. In this case, as shown in FIGS. 4A and 4B, the mounting plate 36 of the holder 32 is first joined to the base plate 31 with the tongue 13 open, and the bolt 40 of the first fastening means 33 is attached. The holder 32 is attached to the base plate 31 by being inserted into the bolt insertion hole 37 and screwed into the female screw 41, fixing the attachment plate 36 to the base plate 31. Further, one end of the rod 43 of the second fastening means 34 is inserted into the cylindrical member 35 of the holder 32 and is fixed with a bolt 44 and a nut 46.
In this case, since the holder 32 and the rod 43 are attached with the tongue 13 opened, the attachment space is widened, and therefore the attachment workability is improved.

  Next, as shown in FIGS. 2 and 4B, the tongue 13 is closed. In this case, since the holder 32 and the rod 43 are set to lengths that do not interfere with the installation rod 17 of the tongue 13, the closing operation can be performed without any trouble. In the state where the tongue 13 is closed, the cylindrical member 35 of the holder 32 faces between the erection rods 17 of the respective tongues 13 and the rod 43 faces between the erection rods 17 of the tongs 13 and is exposed downward. .

Then, the auger 20 is attached to the holder 32 as shown in FIG. In this case, the tubular body 23 of the auger 20 is inserted into the other end of the rod 43 of the second fastening means 34 attached to the holder 32 first, and the bolt 45 of the second fastening means 34 is passed through. Secure with nut 47.
In this case, if the attachment means 30 is configured so that the base end portion of the auger 20 is directly attached to the base plate 31, for example, when the auger 20 and the holder 32 are integrated, the auger 20 is attached. Later, the tongue 13 cannot interfere with the auger 20 and close the tongue 13. On the other hand, when the tongue 13 is closed, the installation rod 17 of the tongue 13 becomes obstructive and the holder 32 cannot be attached or attached. In the embodiment, the holder 32 is firmly attached with the tongue 13 open, and then the base end of the auger 20 is attached to the suspended holder 32 with the tongue 13 closed. Is extremely easy, and the mounting workability is improved.
Here, the reason why the tongs 13 must be closed is to prevent troubles that the tongs 13 collide with each other or become difficult to rotate when the auger 20 is rotated.

  In this state, as shown in FIG. 1, a seedling hole for planting a seedling is excavated in the ground. At this time, the grapple rotation drive mechanism 14 is driven, and the arm 5 and the bracket 10 are appropriately swung. As a result, the frame 12 is rotated, and the auger 20 is rotated with the rotation of the frame 12 so that a seedling hole can be formed. In this case, since the auger 20 can be rotated using the original rotation drive mechanism 14, that is, the rotation drive mechanism 14 of the grapple device G can be shared as the rotation drive mechanism 14 of the auger 20, so that the utilization efficiency of the device can be improved. Improvement is achieved. In addition, since the auger 20 can be attached and easily changed to an excavator without removing the entire grapple device G, the change workability can be improved.

  In the grapple device G according to the first embodiment, the rod 43 of the second fastening means 34 is attached to the holder 32 when the tongue 13 is opened before the auger 20 is attached. The rod 43 of the second fastening means 34 may be attached to the holder 32 after the tongue 13 is closed. However, in order to improve the mounting workability, it is desirable to attach the rod 43 to the holder 32 when the tongue 13 is opened.

5 to 7 show a grapple device G according to a second embodiment of the present invention. This grapple device G is different from the above in the configuration of the attachment means 30.
The attachment means 30 has a base plate 31 that is welded and fixed to the lower side of the frame 12 and an arm portion 54 that is engaged with the tongue 13 when the tongue 13 is closed and is pressed and held on the base plate 31 side. And a fixing means 51 for fixing the base end of the auger 20 to the holder 50.

Specifically, the holder 50 includes a shaft member 52 that is inserted through the cylindrical body 23, and a mounting plate 53 that is welded to the base end of the shaft member 52 and is surface-bonded to the base plate 31. The shaft member 52 is formed with a solid arm portion 54 that extends to both sides and is pressed by the left and right fingers 16 of each tongue 13 when the tongue 13 is closed. In addition, a taper-shaped protrusion 55 coaxial with the shaft member 52 protrudes upward from the center of the mounting plate 53. On the other hand, a tapered positioning hole 56 into which the protrusion 55 is fitted is formed in the center of the base plate 31.
In addition, the holder 50 is set to a length dimension in which the mounting rod 17 does not interfere even when the tongue 13 is opened and closed in a state where the mounting plate 53 is joined to the base plate 31, and when the tongue 13 is closed. The shaft member 52 is formed in such a size that it is exposed between the erection rods 17 of the tongues 13 and exposed downward.

  Further, as shown in FIG. 7 (c), the fastening means 51 includes a bolt 60 inserted into a through-hole penetrating the shaft member 52 of the holder 50 and the cylindrical body 23 of the auger 20 inserted through the shaft member 52, and And a nut 61 that is screwed into a bolt 60 inserted into the through hole to prevent the bolt 60 from coming off.

  Therefore, according to the hydraulic excavator S on which the grapple device G is mounted, when the auger 20 is attached to the grapple device G, first, as shown in FIG. 6 and FIGS. The frame 54 is moved with the portion 54 supported on a pair of bases 63 and the tongue 13 is opened, and the base plate 31 is joined to the mounting plate 53 of the holder 50. In this case, the projection 55 at the center of the mounting plate 53 is fitted into the positioning hole 56 at the center of the base plate 31 for positioning.

  Next, as shown in FIGS. 5, 6 and 7B, the tongue 13 is closed. In this case, since the holder 50 is set to a length that does not interfere with the erection rod 17 of the tongue 13, the closing operation can be performed without any trouble. When the tongue 13 is closed, the left and right fingers 16 of each tongue 13 are engaged and pressed by the arm portions 54 extending on both sides of the shaft member 52, and the holder 50 is pressed and held on the base plate 31 side. In this case, since the holder 50 is held by the tongue 13, the holder 50 is reliably held. Further, the shaft member 52 of the holder 50 is exposed to the lower side while facing the erection rod 17 of the tongue 13.

Then, the frame 12 is moved and the auger 20 is attached to the holder 50 as shown in FIG. In this case, the cylindrical body 23 of the auger 20 is inserted into the shaft member 52 of the holder 50, and the bolt 60 of the fixing means 51 is inserted and fixed by the nut 61.
In this case, if the attachment means 30 is configured so that the base end portion of the auger 20 is directly attached to the base plate 31, for example, when the auger 20 and the holder 50 are integrated, the tongue 13 is connected to the auger 20. The tongs 13 cannot be closed due to interference with the tongs 13. On the other hand, in the state where the tongs 13 are closed, the mounting rod 17 of the tongs 13 becomes in the way and the holder 50 cannot be attached or is difficult to attach. In this embodiment, the holder 50 is firmly held by the tongs 13, and then the base end of the auger 20 is attached to the suspended holder 50, so that attachment becomes extremely easy and attachment workability is improved.

  In this state, a seedling hole for planting a seedling is excavated in the ground. At this time, the grapple rotation drive mechanism 14 is driven, and the arm 5 and the bracket 10 are appropriately swung. As a result, the frame 12 is rotated, and the auger 20 is rotated with the rotation of the frame 12 so that a seedling hole can be formed. In this case, since the auger 20 can be rotated using the original rotation drive mechanism 14, that is, the rotation drive mechanism 14 of the grapple device G can be shared as the rotation drive mechanism 14 of the auger 20, so that the utilization efficiency of the device can be improved. Improvement is achieved. In addition, since the auger 20 can be attached and easily changed to an excavator without removing the entire grapple device G, the change workability can be improved.

In the above-described embodiment, the auger 20 has been described as a type in which the rotary shaft body 21 is provided with the spiral excavation blades 22; however, the present invention is not necessarily limited to this, for example, as shown in FIG. As described above, a type in which the excavating propeller 25 is provided at the tip of the rotating shaft body 21 may be used, and may be changed as appropriate. Further, the base end of the auger 20 may be a shaft portion instead of the cylindrical body 23. In this case, the holders 32 and 50 can be appropriately changed according to the shape of the base end of the auger 20. become.
Furthermore, the working machine is not limited to the above-described hydraulic excavator S, but may be a hydraulic excavator S in which the working arm 5 extends as shown in FIG. 9, and the present invention breaks wood. Of course, the present invention may be applied to an attachment having a turning drive mechanism such as a splitter provided with a finger, and may be applied to any working machine.

1 is an overall view showing a hydraulic excavator according to an embodiment of the present invention using a grapple device according to a first embodiment of the present invention. It is a front view which shows the grapple device which concerns on 1st embodiment of this invention. 1 is a side view showing a grapple device according to a first embodiment of the present invention. It is a figure which shows the process when attaching an auger to the grapple apparatus which concerns on 1st embodiment of this invention. It is a front view which shows the grapple device which concerns on 2nd embodiment of this invention. It is a principal part side view which shows the grapple device which concerns on 2nd embodiment of this invention. It is a figure which shows the process when attaching an auger to the grapple apparatus which concerns on 2nd embodiment of this invention. It is a figure which shows another example of the auger applicable to the grapple apparatus which concerns on embodiment of this invention. It is a figure which shows another hydraulic excavator which can mount the grapple apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the hydraulic excavator which attached the conventional excavator attachment.

Explanation of symbols

S hydraulic excavator (work machine)
G grapple device 1 vehicle body 5 arm 10 bracket 11 rotating shaft 12 frame 13 tongue 14 rotation drive mechanism 15 opening / closing drive mechanism 16 finger 17 installation rod 20 auger 23 cylindrical body 30 mounting means 31 base plate 32 holder 33 first fastening means 34 first Two fastening means 35 Cylindrical member 36 Mounting plate 37 Bolt insertion hole 40 Bolt 41 Female screw 43 Rod 44, 45 Bolt 46, 47 Nut 50 Holder 51 Fastening means 52 Shaft member 53 Mounting plate 54 Arm part 55 Projection 56 Positioning hole 60 Bolt 61 Nut

Claims (4)

A bracket attached to the tip of an arm provided swingably on the work implement, a frame provided rotatably with respect to the bracket, a pair of tongues provided on the frame so as to be openable and closable, and the bracket provided on the bracket In a grapple device provided with a rotation drive mechanism for rotating the frame, and an opening / closing drive mechanism provided on the frame for opening / closing the tongue.
A grapple device characterized in that an auger for excavating the ground can be attached to the lower side of the frame via attachment means so that the axis of the auger is along the rotation axis of the frame. Each of the tongs is configured to include a finger that opens a lower side of the frame when opened and forms a space communicating with the lower side of the frame when closed.
A base plate fixed to the lower side of the frame; and a base plate of the auger that is detachably attached to the base plate and allows the tongue to be opened and closed when the tongue is closed. A holder that holds the base end of the auger while allowing the attachment and detachment of the auger, a first fastening means for fastening the holder to the base plate, and a second fastening means for fastening the base end of the auger to the holder The grapple device according to claim 1, comprising: Each of the tongs is configured to include a finger that opens a lower side of the frame when opened and forms a space communicating with the lower side of the frame when closed.
The mounting means includes a base plate fixed to the lower side of the frame, and an arm portion that is engaged with the tongue when the tongue is closed and is pressed and held on the base plate side, and the auger is closed when the tongue is closed. 2. A holder for holding the base end of the auger while allowing the base end of the base to be attached and detached, and fastening means for fastening the base end of the auger to the holder. Grapple device.   A hydraulic excavator comprising the grapple device according to any one of claims 1 to 3.

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