JP4896175B2 - Grapple - Google Patents

Description

  The present invention relates to a grapple that is attached to an arm of a working machine and is used when gripping, loading, unloading, and stacking various wastes, various chips, and the like.

  Grapples for loading, unloading, and stacking industrial waste on trucks are attached to the tip of a work arm, for example, by a hydraulic cylinder or suspended by a hydraulic cylinder instead of a bucket of a hydraulic excavator. . Such a grapple is, as described in Patent Document 1, an upper structure that is attached to a working arm of a working machine, and a plurality of grapples that are provided at intervals in the circumferential direction on a lower frame of the upper structure. Each of the brackets, a plurality of claws attached to each bracket so as to be able to be opened and closed in the inner and outer directions about the pivot shaft, and a hydraulic cylinder for opening and closing the claws.

  The claw is formed by welding an inner plate, left and right side plates, and an outer plate, and has a rectangular cross-sectional shape in the short direction. The bracket for attaching the claw has a pair of vertical plates and a boss welded between the pair of vertical plates. The claw is attached so as to be rotatable around an axis that penetrates the boss. The grapple described in Patent Document 1 houses a hydraulic cylinder for opening and closing the claw inside the claw.

JP 2008-2104026 A

  When gripping an object such as industrial waste with a grapple, foreign objects such as metal pieces and dust enter the gap between the bottom end of the inner plate and the bottom of the bracket. There is a risk of damaging the hydraulic cylinder for opening and closing the claws accommodated inside the hydraulic cylinder and the hydraulic hose connected to the hydraulic cylinder.

  In view of the above problems, the present invention prevents foreign matter from entering between the base side end of the inner surface plate of the claw and the bottom of the bracket, and can prevent damage to the hydraulic cylinder and the hydraulic hose due to foreign matter. The purpose is to provide a grapple.

The grapple of claim 1 includes an upper structure attached to the arm of the work implement;
A plurality of claw mounting brackets provided on the lower frame of the upper structure at intervals in the circumferential direction;
A plurality of claws, each of which has a hollow structure composed of an inner surface plate, left and right side plates, and an outer surface plate, and is attached to each bracket so as to be able to open and close in and out about the pivot shaft by fitting a root portion to each bracket. ,
In the grapple provided with the hydraulic cylinder that is provided inside each claw and opens and closes the claw,
A partition plate is attached to at least one of the inner surface plate inside or the left and right side plates inside the base side inside the claw, and between the partition plate, the inner surface plate, the bottom of the bracket, and the left and right side plates, It is characterized in that a space for accommodating a foreign substance entering the nail is formed.

The grapple of claim 2 is the grapple of claim 1,
A return portion toward the inner surface plate side to which the partition plate is attached is provided at the bracket-side tip of the partition plate.

The grapple according to claim 3 is the grapple according to claim 1 or 2,
The partition plate is attached to the inside of the inner surface plate,
The partition plate is provided with a scraper that abuts on an outer peripheral surface of a claw pivot attachment boss in the bracket or an outer peripheral surface of a bottom plate of the bracket.

  According to the first aspect of the present invention, the partition plate is provided inside the claw at the base side, and a space is provided between the partition plate, the inner surface plate, the bracket bottom portion, and the left and right side plates for accommodating foreign matter that enters the claw. Therefore, it is possible to prevent foreign matter that enters the claw from further entering the claw that accommodates the hydraulic cylinder. This prevents the claw and the hydraulic cylinder for opening and closing the claw and the hydraulic hose connected to the hydraulic cylinder, which are housed inside the bracket, from being damaged by foreign matter. In addition, since it is difficult for foreign matter to enter the inside of the nail, the maintenance work interval for removing the foreign matter can be extended.

  According to the second aspect of the present invention, since the return portion is provided at the bracket-side tip of the partition plate, the foreign matter accumulated in the partition plate space is further prevented from entering the claw.

  According to the invention of claim 3, since the foreign matter intrusion preventing member that contacts the outer peripheral surface of the claw pivot shaft insertion boss in the bracket or the bottom plate of the bracket is provided, the foreign matter accumulated in the space in the partition plate is further reduced. It is better prevented from entering the inside of the nail.

It is a perspective view which shows one Embodiment of the grapple of this invention. It is a perspective view which abbreviate | omits and shows a part of grapple of this embodiment. It is a perspective view which shows the attachment structure of the partition plate of this embodiment. It is side surface sectional drawing which shows the structure of the base part of the nail | claw which shows the closed state of the nail | claw of this embodiment. It is side surface sectional drawing which shows the structure of the base part of the nail | claw which shows the open state of the nail | claw of this embodiment. It is side surface sectional drawing which shows the other attachment structure of the partition plate by this invention. It is side surface sectional drawing which shows the attachment structure of the partition plate of FIG. It is side surface sectional drawing which shows other embodiment of the grapple of this invention. It is side surface sectional drawing which shows the reference example of the grapple of this invention.

  FIG. 1 is a perspective view showing an embodiment of the grapple of the present invention, and FIG. 2 is a perspective view showing a part of the grapple except for a part thereof. The grapple includes a plurality of upper structures 1 attached to a working arm (not shown) such as a hydraulic excavator and a cylindrical lower frame 2 provided at equal intervals in the circumferential direction. Brackets 3, pawls 4 having a hollow structure attached to the respective brackets 3, and hydraulic cylinders 5 for opening and closing the pawls accommodated and attached to the respective claws 4. Although this embodiment shows an example in which five brackets 3 and five claws 4 are provided, the present invention can be applied to a grapple in which two or more of these brackets 3 and claws 4 are provided.

  The upper structure 1 has a turning device 8 for turning the lower frame 2 by a hydraulic motor 6 and a bracket 9 provided on the turning device 8 for pinning the bracket 9 to a working arm. Boss 10 and a boss 11 for connecting to a link attached to the working arm. Note that the grapple of the present invention can be realized as a structure in which the grapple is attached to the working arm of the working machine in a hanging manner instead of being attached to the working arm of the working machine by a hydraulic cylinder.

  Each bracket 3 has two parallel plates 3a and 3a, respectively. The lower plates of these vertical plates 3a are respectively provided with through holes 12 for attaching the claws, and the claws 4 are pivotally attached to the opposing surfaces of the lower portions of the parallel plates 3a and 3a so as to communicate with these through holes 12. The boss 13 to be welded is welded. In addition, through holes 14 for attaching the hydraulic cylinder 5 are provided in the upper portions of the pair of parallel plates 3a and 3a constituting the bracket 3, respectively. Arc-shaped bottom plate 31 and top plate 36 are welded to the bottom and top surfaces of parallel plates 3a and 3a, respectively (see FIG. 4). The outer peripheral surfaces of the bottom plate 31 and the top plate 36 are on an arc centered on a pivot shaft 18 described later.

  The claw 4 has a hollow structure formed by welding an inner surface plate 4a, an outer surface plate 4c, and left and right side plates 4b. As shown in FIGS. 1, 2, 4, and 5, each of the claws 4 is attached to the bracket 3 so as to be pivotable around a pivot shaft 18 that is fitted around the bracket 3 and penetrates the boss 13. . The hydraulic cylinder 5 for opening and closing the claw connects the boss 19 at one end to the bracket 3 by a pin 21 that is inserted into the through hole 14 and a boss (not shown) communicating with the through hole 14. The boss 20 at the other end of the hydraulic cylinder 5 is connected to the claw 4 by a pin 23 inserted into a through hole 22 and a boss (not shown) communicating with the through hole 22.

  In order to perform maintenance work such as connecting and disconnecting a hydraulic hose (not shown) of the hydraulic cylinder 5 to the bottom side port 25 (see FIG. 2), cleaning the inside of the claw 4 and the like at the base part of the side plates 4b. The opening 26 is provided. The opening 26 is closed by a removable cover plate 27.

  3 to 5, reference numeral 30 denotes a partition plate provided on the inner surface plate 4 a inside the base side of the claw 4. In this embodiment, an example is shown in which the partition plate 30 is provided on the inner surface plate 4a by welding. As shown in FIG. 4, the end of the partition plate 30 faces the arc-shaped bottom plate 31 of the bracket 3 with a minute gap g. And the space 32 which accommodates a foreign material is formed between this partition plate 30, the inner surface plate 4a, the left and right side plates 4b, and the bottom of the bracket 3. In this embodiment, the return portion 30a toward the inner surface plate 4a is formed at the tip of the partition plate 30 by bending. The return portion 30a may be provided at the tip of the partition plate 30 by welding.

  As described above, in this embodiment, the partition plate 30 provides the space 32 for storing the foreign matter that enters the claw 4, so that the inside of the claw 32 is formed between the inner surface plate 4 a and the bottom plate 31 of the bracket 3. It is possible to prevent foreign matter that enters the inside of the claw 4 that further contains the hydraulic cylinder 5 from entering the inside of the claw 4. For this reason, it is prevented that the hydraulic cylinder 5 accommodated in the inside of the nail | claw 4 and the bracket 3 and the hydraulic hose connected to this hydraulic cylinder 5 are damaged by a foreign material. In addition, since it is difficult for foreign matter to enter the claw 4, the maintenance work interval for removing foreign matter can be extended. This foreign matter can be removed by inserting a scraping bar bent from the space 34 between the inner surface plate 4a and the bottom plate 31 of the bracket 3 (see FIG. 5).

  In order to eliminate this foreign matter, a cleaning opening 35 (see FIGS. 4 and 5) is provided on the surface corresponding to the space 32 of the side plate 4b or a cleaning opening is provided on the inner surface plate 4a. The opening portion 35 of the side plate 4b or the opening portion of the inner surface plate 4a may be normally closed with a lid plate, and the lid plate may be removed during maintenance to scrape out foreign matter accumulated in the space 32 from the opening portion 35.

  In this embodiment, since the return portion 30a is provided at the bracket side tip of the partition plate 30, foreign matter accumulated in the space 32 in the partition plate further enters the accommodating portion of the hydraulic cylinder 5 inside the claw 4. Is better prevented.

  In this embodiment, there is also provided a means for preventing foreign matters such as metal pieces and dust from entering between the outer surface plate 4c of the claw 4 and the top plate 36, that is, a movable cover 37. As shown in FIG. 5, the movable cover 37 closes the gap between the outer surface plate 4 c of the claw 4 and the top plate 36 of the bracket 3 in a state where the claw 4 is closed, and prevents foreign matter from entering from the gap. It is provided to prevent this. The movable cover 37 is provided to be rotatable around a pin 38 provided on the upper surface of a boss (not shown) concentric with the through hole 14 provided in the bracket 3. As shown in FIG. 5, the movable cover 37 has a length that closes the gap between the claw 4 and the top plate 36 of the bracket 3 even in the most closed state. Further, the movable cover 37 has its free end placed on the tube of the hydraulic cylinder 5 during the opening / closing operation of the claw 4 and moves up and down in response to the vertical movement of the hydraulic cylinder 5. A gap between the face plate 4c and the face plate 4c is always closed, and foreign matter can be prevented from entering there.

  6 and 7 show another embodiment of the present invention. In this embodiment, the partition plate 30 is detachably attached to the inner surface plate 4 by a bolt 40 and a wing nut 41. FIG. According to this embodiment, when performing the maintenance work, the lid plate 27 is removed to open the opening 26 (see FIG. 2), and the operator inserts his hand into the nail 4 from the opening 26. The partition plate 30 can be removed by turning the wing nut 41. For this reason, the foreign matter accumulated in the space 32 can be held in the hand and removed to the outside, and the foreign matter removal operation is facilitated. In addition, 30b is a reinforcing plate welded to the upper surface of the partition plate 30, and 30c is a bent portion for reinforcement.

  FIG. 8 shows another embodiment of the present invention. In this embodiment, a foreign substance intrusion prevention member 42 such as a scraper that contacts the outer periphery of the boss 13 is provided at the tip of the partition plate 30. is there. The foreign matter intrusion prevention member 42 is preferably made of resin, but may be made of rubber, sponge, or the like. Further, the bottom plate 31 may be configured to be concentric with the boss 13 and the foreign matter intrusion prevention member 42 abuts against the bottom plate 31 regardless of the degree of opening and closing of the claw 4.

  By providing the foreign matter intrusion preventing member 42 in this manner, foreign matter accumulated in the space 32 in the partition plate 30 is further prevented from further entering the inside of the claw 4 in which the hydraulic cylinder 5 is accommodated.

FIG. 9 shows a reference example of the present invention. In this reference example , a foreign matter intrusion prevention member 43 such as a scraper that comes into contact with the boss 13 is provided at the root of the inner surface plate 4a. The foreign matter intrusion preventing member 43 is also preferably made of resin like the foreign matter intrusion preventing member 42, but may be made of rubber, sponge or the like. Further, the bottom plate 31 shown in FIGS. 4 and 5 may be configured to be concentric with the boss 13 so that the foreign matter intrusion preventing member 43 contacts the bottom plate 31 regardless of the degree of opening and closing of the claw 4.

Further, in this reference example , the gap between the bottom surface 4 c and the top plate 36 or the movable cover 37 is also brought into contact with the top plate 36 or the movable cover 37 at the root portion of the outer surface plate 4 c as the claw 4 is opened or closed. A foreign matter intrusion prevention member 44 such as a scraper is provided. The foreign matter intrusion prevention member 44 may be provided at the base of the side plate 4b so as to contact the outer surface of the parallel plate 3a, thereby closing the gap between the side plate 4b and the parallel plate 3a.

According to this reference example , the inner surface plate 4a is provided with the foreign matter intrusion preventing member 43 that comes into contact with the boss 13 or the bottom plate, so that foreign matter can reliably enter the claw 4 from between the inner surface plate 4a and the bottom of the bracket. Is prevented. Further, by providing the outer surface plate 4c or the side surface plate 4b with the foreign matter intrusion preventing member 44, the outer surface plate 4c and the top plate 36 or the movable cover 37, or between the side surface plate 4b and the outer surface of the parallel plate 3a. Intrusion of foreign matter can also be prevented. This foreign matter intrusion preventing member 44 can also be applied to the embodiment shown in FIGS.

  The partition plate 30 and the foreign matter intrusion prevention members 42 to 44 of the present invention may be structured to be attached to the side plate 4b, and may be provided so that the position with respect to the bracket 3 can be adjusted. When the partition plate 30 is provided on the side plate 4b, the return portion 30a is provided toward the inner surface plate 4a in the same manner as when the partition plate 30 is provided on the inner surface plate 4a.

1: upper structure, 2: lower frame, 3: bracket, 3a: parallel plate, 4: claw, 4a: inner plate, 4b: side plate, 4c: outer plate, 5: hydraulic cylinder, 6: hydraulic motor, 8 : Turning device, 9: bracket, 10, 11: boss, 12: through hole, 13: boss, 14: through hole, 18: pivot shaft, 20: boss, 21: pin, 22: through hole, 23: pin , 26: opening, 27: lid plate, 30: partition plate, 30a: return portion, 31: bottom plate, 32: space, 35: opening, 36: top plate, 37: movable cover, 38: pin, 40: Bolt, 41: Wing nut, 42-44: Foreign matter intrusion prevention member

Claims (3)

An upper structure attached to the arm of the work implement;
A plurality of claw mounting brackets provided on the lower frame of the upper structure at intervals in the circumferential direction;
A plurality of claws, each of which has a hollow structure composed of an inner surface plate, left and right side plates, and an outer surface plate, and is attached to each bracket so as to be able to open and close in and out about the pivot shaft by fitting a root portion to each bracket. ,
In the grapple provided with the hydraulic cylinder that is provided inside each claw and opens and closes the claw,
A partition plate is attached to at least one of the inner surface plate inside or the left and right side plates inside the base side inside the claw, and between the partition plate, the inner surface plate, the bottom of the bracket, and the left and right side plates, A grapple characterized by forming a space for accommodating a foreign substance entering the nail. The grapple according to claim 1,
A grapple, wherein a return portion toward the inner surface plate side to which the partition plate is attached is provided at a bracket side distal end portion of the partition plate. The grapple according to claim 1 or 2,
The partition plate is attached to the inside of the inner surface plate,
A grapple, wherein the partition plate is provided with a foreign matter intrusion preventing member that comes into contact with an outer peripheral surface of a claw pivot shaft insertion boss in the bracket or an outer peripheral surface of a bottom plate of the bracket.

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