JP2015080422A - Mowing attachment of construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mowing attachment of a construction machine capable of improving durability.SOLUTION: A mowing attachment 13 includes: a bracket 32 rotatably connected to a tip side of an arm 12 that rotates by the telescopic drive of a hydraulic cylinder 16 for the attachment; a rotary cylinder 33 provided in the bracket 32; a rotation shaft 34 provided in a casing 26 which is inserted into the rotary cylinder 33 of the bracket 32 in a freely rotatable manner; a disc 35 attached to a tip of the rotation shaft 34; fixing cylinders 36A-36D provided in the casing 26 which are arranged so as to be rotationally symmetrical around the rotation shaft 34; fixing holes 37A-37D formed on the bracket 32 which are arranged so as to correspond to the fixing cylinders 36A-36D of the casing 26; and four fixing pins 38 inserted into a combination of the fixing cylinders of the casing 26 and the fixing holes of the bracket 32.

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a mowing attachment for a construction machine attached to a tip side of an arm of the construction machine.

  A hydraulic excavator, which is one of construction machines, includes a lower traveling body, an upper swinging body that is turnable on the lower traveling body, and an articulated work device that is provided on the upper swinging body so as to be able to rise and fall. And. The working device includes a boom that is pivotable in the vertical direction with respect to the upper swing body, an arm that is pivotally coupled to the tip of the boom, and a pivot that is pivotally coupled to the tip of the arm. And a bucket which is a standard attachment, and is rotated by the expansion and contraction drive of the boom hydraulic cylinder, the arm hydraulic cylinder, and the attachment hydraulic cylinder.

  Moreover, in order to respond to various usage purposes, the hydraulic excavator can be equipped with an optional attachment instead of the standard bucket, and one of them is a mowing attachment (for example, Patent Documents). 1).

  The attachment for mowing described in Patent Document 1 is rotatably connected to the distal end side of an arm, and is connected to a bracket that is rotated by expansion and contraction of an attachment hydraulic cylinder, and a cutter head that is rotatably connected to the bracket. A mechanism and a positioning mechanism for fixing the rotational position of the cutter head relative to the bracket. The cutter head includes a casing, a knife shaft (blade shaft) rotatably provided in the casing, a hammer knife (mowing blade) provided on the outer peripheral side of the knife shaft, and a rotating device that rotates the knife shaft. And have.

  The connection mechanism includes a bolt hole formed on the bracket side, a connection bolt fixed to the casing side and inserted into the bolt hole on the bracket side in a rotatable state, and a connection bolt on the casing side on the bracket side. It is comprised with the nut attached to the front-end | tip of a connection bolt so that it may not come out from the bolt hole of this.

  The positioning mechanism includes one pin hole formed in the contact plate of the bracket, three pin holes formed in the contact plate of the casing, one pin hole on the casing side, and a pin hole on the bracket side. It consists of a positioning pin inserted.

Japanese Patent Laid-Open No. 9-121649 (especially refer to FIG. 4)

  In the mowing attachment, for example, a load applied to the blade shaft by mowing work, a load applied to the casing by contact with the ground or the like, a load due to an inertial force of the entire attachment, and the like are generated. In the structure described in Patent Document 1, the load received by the connecting bolt (rotating shaft) is large, and there is room for improvement in terms of durability.

  The objective of this invention is providing the attachment for mowing of the construction machine which can improve durability.

  To achieve the above object, the present invention provides a casing, a blade shaft rotatably provided in the casing, a mowing blade provided on the outer peripheral side of the blade shaft, and a rotation for rotating the blade shaft. An attachment for mowing that is attached to the distal end side of an arm of a construction machine and is pivotally connected to the distal end side of the arm and rotated by a telescopic drive of an attachment hydraulic cylinder, and the bracket A rotary cylinder provided in the casing, a rotary shaft provided in the casing and rotatably inserted in the rotary cylinder of the bracket, and the rotary shaft so that the rotary shaft does not come off from the rotary cylinder of the bracket. A retaining member attached to the tip of the shaft, and at least four provided on the casing and arranged to be rotationally symmetric about the rotational shaft A fixed cylinder, at least four fixing holes formed on the bracket and arranged so as to correspond to the fixed cylinder of the casing, and a combination of the fixed cylinder of the casing and the fixing hole of the bracket are inserted. And at least four fixing pins.

  Thus, in the present invention, the casing is provided with at least four fixed cylinders arranged to be rotationally symmetric about the rotation axis, and the bracket has at least four fixed holes arranged so as to correspond to the fixed cylinders. And at least four fixing pins inserted through the combination of the fixing cylinder of the casing and the fixing hole of the bracket are provided. Thereby, a load can be shared and received by at least four fixed pins. Further, since the contact area between the fixed pin and the fixed cylinder is relatively large, the stress applied to the fixed pin can be reduced. Therefore, for example, the durability of the mowing attachment can be improved as compared with the structure described in Patent Document 1.

  According to the present invention, the durability of the mowing attachment can be improved.

It is a side view showing the structure of the hydraulic excavator to which the attachment for mowing of one embodiment of the present invention is attached, and shows the case where the casing of the attachment for mowing is arranged vertically with respect to the bracket. It is a perspective view showing the structure of the attachment for mowing of one Embodiment of this invention. It is sectional drawing in the cross section III-III in FIG. FIG. 4 is a partially enlarged sectional view taken along a section IV-IV in FIG. 2. FIG. 5 corresponds to FIG. 4 and shows a state where the fixing pin is removed in order to rotate the casing of the mowing attachment with respect to the bracket. It is a top view showing the structure of the attachment for mowing of one Embodiment of this invention, and the case where the casing of the attachment for mowing is arrange | positioned vertically with respect to a bracket, and the case where it arrange | positions sideways are each shown. It corresponds to FIG. 1 and shows the case where the casing of the mowing attachment is arranged sideways with respect to the bracket.

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

  FIG. 1 is a side view showing a structure of a hydraulic excavator to which a mowing attachment according to this embodiment is attached. In the following, the driver's front side (left side in FIG. 1), rear side (right side in FIG. 1), left side (paper surface in FIG. 1) when the driver is seated in the driver's seat in the state shown in FIG. Front side) and right side (back side toward the paper surface in FIG. 1) are simply referred to as front side, rear side, left side, and right side.

  The hydraulic excavator shown in FIG. 1 is a mini excavator having a mechanical mass of less than 6 tons. The hydraulic excavator includes a crawler-type lower traveling body 1, an upper revolving body 2 provided on the lower traveling body 1 so as to be able to swivel, and a multi-stage coupled to the front side of the upper revolving body 2 via a swing post 3. And an articulated working device 4.

  The lower traveling body 1 includes a substantially H-shaped track frame 5 as viewed from above. A drive wheel 6 is rotatably supported at the left rear end of the track frame 5, and a driven wheel (idler) 7 is rotatably supported at the left front end of the track frame 5, and the left drive wheel 6 and the left slave wheel are supported. A crawler 8 on the left side is wound around the driving wheel 7. The left driving wheel 6 is rotated by the driving of the left traveling motor (not shown), and the left crawler belt 8 is rotated.

  Although not shown, a drive wheel 6 is rotatably supported on the right rear end of the track frame 5, and a driven wheel 7 is rotatably supported on the right front end of the track frame 5. A right crawler belt 8 is wound around the right driven wheel 7. The right driving wheel 6 is rotated by driving a right traveling motor (not shown), and the right crawler belt 8 is rotated.

  A soil removal blade 9 is provided on the front side of the track frame 5 so as to be movable up and down. The blade 9 moves up and down by driving a blade hydraulic cylinder (not shown).

  A turning wheel 10 is provided at the center of the track frame 5, and the upper turning body 2 is turnable through the turning wheel 10. And the upper revolving body 2 turns right and left by driving of a turning motor (not shown).

  The swing post 3 is provided on the front side of the upper swing body 2 so as to be rotatable in the left-right direction. Then, the swing post 3 is rotated in the left-right direction by driving a swing hydraulic cylinder (not shown), whereby the working device 4 is swung left and right.

  The work device 4 includes a boom 11 connected to the swing post 3 so as to be rotatable in the vertical direction, an arm 12 connected to the boom 11 so as to be rotatable in the vertical direction, and the arm 12 rotated in the vertical direction. An optional mowing attachment 13 (mowing machine) is provided, which is connected in an optional manner. The boom 11, the arm 12, and the mowing attachment 13 are rotated in the vertical direction by driving the boom hydraulic cylinder 14, the arm hydraulic cylinder 15, and the attachment hydraulic cylinder 16. The mowing attachment 13 is replaceable with a bucket that is a standard attachment, an attachment with other optional equipment (specifically, for example, a crusher, a breaker, or an auger).

  The upper swing body 2 covers a swivel frame 17 that forms the lower foundation structure, a canopy type cab 18 provided on the left front side of the swivel frame 17, and portions other than the cab 18 on the swivel frame 17. An exterior cover 19 and a counterweight 20 provided on the rear side on the revolving frame 17 for balancing with the work device 4 are provided.

  The driver's cab 18 is provided with a driver's seat (seat) 21 on which the driver is seated. In front of the driver's seat 21, left and right traveling operation levers 22 that can be operated with hands or feet and that operate in the front-rear direction to instruct the operation of the left and right traveling hydraulic motors are provided. An optional operation pedal 23 for instructing the operation of the rotating device (details will be described later) of the mowing attachment 13 is provided at the left foot portion of the left traveling operation lever 22. A swing operation pedal (not shown) for instructing the operation of the swing hydraulic cylinder by operating in the left-right direction is provided at the right foot portion of the right travel operation lever 22.

  On the left side of the driver's seat 21 is a cross-operated arm for turning that instructs the operation of the hydraulic cylinder 15 for the arm by operating in the front-rear direction, and instructs the operation of the hydraulic motor for turning by operating in the left-right direction. An operation lever 24 is provided. On the right side of the driver's seat 21, the operation of the boom hydraulic cylinder 14 is instructed by operating in the front-rear direction, and the operation of the attachment hydraulic cylinder 16 is instructed by operating in the left-right direction. An operation lever (not shown) is provided. A blade operation lever 25 is provided on the right side of the driver's seat 21 to instruct the operation of the blade hydraulic cylinder by operating in the front-rear direction.

  Next, the structure of the mowing attachment 13 of this embodiment will be described.

  FIG. 2 is a perspective view showing the structure of the mowing attachment 13 of the present embodiment. 3 is a cross-sectional view taken along section III-III in FIG. 2, and FIG. 4 is a partially enlarged cross-sectional view taken along section IV-IV in FIG. FIG. 5 corresponds to FIG. 4 and shows a state where the fixing pin is removed in order to rotate the casing of the mowing attachment relative to the bracket. FIG. 6 is a top view showing the structure of the mowing attachment 13 of the present embodiment, and shows a case where the casing of the mowing attachment 13 is arranged vertically and a case where the casing is arranged horizontally with respect to the bracket. FIG. 7 corresponds to FIG. 1 described above, and shows a case where the casing of the mowing attachment 13 is disposed sideways with respect to the bracket. FIG. 1 shows a case where the casing of the mowing attachment 13 is arranged vertically with respect to the bracket.

  In FIG. 2 to FIG. 7 and FIG. 1 described above, the mowing attachment 13 is provided on a casing 26, a blade shaft 27 that is rotatably provided in the casing 26, and an outer peripheral side of the blade shaft 27. A grass cutting blade (hammer knife) 28 and a rotating device (not shown) which is attached to the outside of the casing 26 and rotates the blade shaft 27 are provided. A grass intake port 29A is formed on the front side (left side in FIG. 3) of the blade shaft 27 in the casing 26, and on the rear side (right side in FIG. 3) of the blade shaft 27 in the rotational direction. An outlet 29B is formed. A rubber sag 30 is attached to the grass discharge port 29B. In addition, on both sides of the casing 26, a sled 31 that increases strength and contacts the ground G is provided.

  The mowing attachment 13 further includes a bracket 32 that is rotatably connected to the distal end side of the arm 12 and that is rotated by the expansion and contraction drive of the attachment hydraulic cylinder 16. A rotating cylinder 33 is fixed to the bracket 32. A rotating shaft 34 is fixed to the upper portion of the casing 26, and the rotating shaft 34 is inserted into the rotating cylinder 33 of the bracket 32 in a rotatable state. Thereby, the casing 26 can be rotated with respect to the bracket 32 (see FIG. 5). A disc 35 (a retaining member) larger than the inner diameter of the rotating cylinder 33 is attached to the tip of the rotating shaft 34. Thereby, the rotating shaft 34 of the casing 26 is prevented from falling off from the rotating cylinder 33 of the bracket 32. The rotation center line of the casing 26 that rotates with respect to the bracket 32 is substantially orthogonal to the rotation center line of the bracket 32 that rotates with respect to the arm 12.

  Fixed cylinders 36 </ b> A to 36 </ b> D arranged so as to be rotationally symmetric about the rotation shaft 34 are fixed to the upper portion of the casing 26. These fixed cylinders 36 </ b> A to 36 </ b> D have the same distance from the center of the rotation shaft 34 and are arranged at intervals of 90 degrees along the circumferential direction of the rotation shaft 34. The bracket 32 is formed with fixing holes 37A to 37D arranged so as to correspond to the fixing cylinders 36A to 36D of the casing 26 (in other words, to be rotationally symmetric about the rotating shaft 34 of the casing 26). Yes. The diameters of the fixing holes 37A to 37D are substantially the same as the inner diameters of the fixed cylinders 36A to 36D.

  For example, as shown in FIG. 6A, the casing 26 (and the blade shaft 27) of the mowing attachment 13 is vertically oriented with respect to the bracket 32 (and the arm 12) (left and right direction in FIG. 6A). The fixed cylinder 36A of the casing 26 and the fixing hole 37A of the bracket 32 are combined and the fixing pin 38 is inserted, and the fixing cylinder 36B of the casing 26 and the fixing hole 37B of the bracket 32 are combined to fix the fixing pin 38. , The fixing cylinder 38C of the casing 26 and the fixing hole 37C of the bracket 32 are combined and the fixing pin 38 is inserted, and the fixing cylinder 36D of the casing 26 and the fixing hole 37D of the bracket 32 are combined and the fixing pin 38 is inserted. To do. Thereby, the casing 26 (and blade shaft 27) of the mowing attachment 13 can be fixed to the bracket 32 so as to be vertically oriented (see FIG. 1).

  Alternatively, for example, as shown in FIG. 6B, the casing 26 (and the blade shaft 27) of the mowing attachment 13 is oriented laterally (vertical direction in FIG. 6B) with respect to the bracket 32 (and the arm 12). The fixing cylinder 38A of the casing 26 and the fixing hole 37B of the bracket 32 are combined and the fixing pin 38 is inserted, and the fixing cylinder 38B of the casing 26 and the fixing hole 37C of the bracket 32 are combined to fix the fixing pin 38. The fixing cylinder 38D of the casing 26 and the fixing hole 37D of the bracket 32 are combined to insert the fixing pin 38, and the fixing cylinder 38D of the casing 26 and the fixing hole 37A of the bracket 32 are combined to insert the fixing pin 38. . Thereby, it can fix so that the casing 26 (and blade axis | shaft 27) of the attachment 13 for mowing may become sideways with respect to the bracket 32 (refer FIG. 7).

  A bolt hole 39 is formed in the fixing pin 38, and a bolt hole 40 is formed in the fixing cylinders 36A to 36D correspondingly. Then, the bolt 41 is inserted into the bolt hole 39 of the fixing pin 38 and the bolt hole 40 of the fixed cylinder, and the nut 42 is attached to the tip of the bolt 41. This prevents the fixing pin 38 from coming off.

  In the present embodiment configured as described above, the load can be shared by the four fixing pins 38. Further, since the contact area between the fixing pin 38 and the fixing cylinders 36A to 36D is relatively large, the stress applied to the fixing pin 38 can be reduced. Therefore, for example, the durability of the mowing attachment 13 can be improved as compared with the structure described in Patent Document 1.

  Although not specifically described in the above embodiment, the difference between the outer diameter of the fixing pin 38 and the inner diameter of the fixing cylinders 36 </ b> A to 36 </ b> D is the difference between the outer diameter of the rotating shaft 34 and the inner diameter of the rotating cylinder 33. You may comprise so that it may become comparable as the difference with a dimension. In this case, the load can be shared and received by both the fixed pin 38 and the rotating shaft 34. Alternatively, the difference between the outer diameter dimension of the fixing pin 38 and the inner diameter dimension of the fixed cylinders 36 </ b> A to 36 </ b> D may be configured to be smaller than the difference between the outer diameter dimension of the rotating shaft 34 and the inner diameter dimension of the rotating cylinder 33. . In this case, the fixed pin 38 is likely to come into contact with the fixed cylinders 36 </ b> A to 36 </ b> D, while the rotary shaft 34 is difficult to contact the rotary cylinder 33. Thereby, while receiving a load with the fixed pin 38, it becomes difficult to apply a load to the rotating shaft 34, and durability of the rotating shaft 34 can be improved.

  Further, in the above-described embodiment, in order to prevent the fixing pin 38 from being removed, bolt holes 39 and 40 are formed in the fixing pin 38 and the fixing cylinders 36A to 36D, and bolts 41 are inserted into the bolt holes 39 to The case where the nut 42 is attached to the tip of 41 has been described as an example. However, the present invention is not limited to this, and modifications can be made without departing from the technical idea and spirit of the present invention. That is, if it is difficult for the fixing pin 38 to come off due to its own weight or the like, the bolt holes 39 and 40 are not formed in the fixing pin 38 and the fixing cylinders 36A to 36D, and the bolt 41 and the nut 42 may not be provided.

  In the above embodiment, the case where four fixing pins 38 and four fixing cylinders are provided has been described as an example. However, the present invention is not limited to this, and modifications can be made without departing from the technical idea and spirit of the present invention. Is possible. That is, it is sufficient that there are at least four fixed cylinders 38 and four fixed cylinders, for example, eight. In this case, the same effect as described above can be obtained.

  In the above description, as an application target of the present invention, a swing type hydraulic excavator (specifically, the boom 11 is connected to the front side of the swing frame 17 via the swing post 3) has been described as an example. Not limited to. That is, for example, an offset-type hydraulic excavator (specifically, a lower boom coupled to the revolving frame 17 so as to be pivotable in the vertical direction and an upper boom coupled to the tip of the lower boom so as to be pivotable in the left-right direction. You may apply to the thing etc. which provided the boom eccentrically moved to the left-right direction by rotation of an upper boom. Moreover, although the crawler type hydraulic excavator has been described as an example of the application of the present invention, the present invention is not limited thereto, and may be applied to, for example, a wheel type hydraulic excavator. Needless to say, the present invention may be applied to other construction machines other than the hydraulic excavator.

12 Arm 13 Attachment for Mowing 16 Hydraulic Cylinder for Attachment 26 Casing 27 Blade Shaft 28 Mowing Blade 32 Bracket 33 Rotating Tube 34 Rotating Shaft 35 Disc (Retaining Member)
36A to 36D Fixed cylinder 37A to 37D Fixed hole 38 Fixed pin 39 Bolt hole 40 Bolt hole 41 Bolt 42 Nut

Claims (3)

A casing, a blade shaft rotatably provided in the casing, a grass cutting blade provided on an outer peripheral side of the blade shaft, and a rotating device that rotates the blade shaft;
In the mowing attachment attached to the tip side of the arm of the construction machine,
A bracket rotatably connected to the distal end side of the arm, and rotated by an expansion / contraction drive of an attachment hydraulic cylinder;
A rotating cylinder provided on the bracket;
A rotating shaft provided in the casing and inserted in a rotatable state into the rotating cylinder of the bracket;
A retaining member attached to the tip of the rotating shaft so that the rotating shaft does not come out of the rotating cylinder of the bracket;
At least four fixed cylinders provided in the casing and arranged to be rotationally symmetric about the rotation axis;
At least four fixing holes formed in the bracket and arranged to correspond to the fixed cylinder of the casing;
A mowing attachment for a construction machine, comprising at least four fixing pins inserted through a combination of the fixed cylinder of the casing and the fixing hole of the bracket. In the attachment for mowing of the construction machine according to claim 1,
A first bolt hole formed in each of the at least four fixing pins;
A second bolt hole formed in each of the at least four fixed cylinders;
At least four bolts inserted through a combination of the first bolt hole and the second bolt hole;
A mowing attachment for a construction machine, comprising: a nut attached to a tip of each of the at least four bolts. In the attachment for mowing of the construction machine according to claim 1,
The difference between the outer diameter of the fixing pin and the inner diameter of the fixed cylinder of the casing and the diameter of the fixing hole of the bracket is the outer diameter of the rotating shaft of the casing and the inner diameter of the rotating cylinder of the bracket. An attachment for mowing a construction machine, characterized in that it is configured to be smaller than a difference from a dimension.

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