JP4931645B2 - 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, as described in Patent Document 1, includes an upper structure attached to a working arm of a work machine, and a plurality of pieces provided at intervals in the circumferential direction at the lower portion of the upper structure. A bracket for attaching the claw, a plurality of claws attached to each bracket so as to be able to be opened and closed in the inner and outer directions around the pivot shaft, and a hydraulic cylinder for opening and closing the claw.

  In Patent Document 1, in order to protect the hydraulic cylinder for opening and closing the claw, an opening window is provided on the outer surface of the cylinder cover provided on the outer surface of the claw, and a lid is detachably attached to the opening window. ing.

JP-A-2005-240431

  In the conventional grapple such as the grapple described in Patent Document 1, the hydraulic cylinder can be covered with the claw most open. However, in order to secure the amount of the object to be gripped, it is necessary to secure the claw opening / closing range to a certain extent. Therefore, when the claw is in the most closed state, the bottom end (the claw root side) of the hydraulic cylinder is covered. It cannot be covered with the body (that is, there is a gap), and the bottom end is exposed, and in the processing operation of industrial waste etc., scattered or bounced metal pieces or dust etc. There is a problem that the hydraulic cylinder may be damaged by entering into the hydraulic cylinder housing chamber surrounded by. In particular, damage to the piston rod is a problem.

  In addition, because of the structure of the grapple, the position of the pivot center of the claw when the claw is opened and closed is different from the position of the swing center of the hydraulic cylinder that is associated with the claw opening and closing operation of the hydraulic cylinder. The distance between the portion and the lid that covers this changes as the nail opens and closes, and when the nail is most closed, the interval between the base portion of the nail and the lid is minimized. However, when the mounting position of the lid is determined based on the distance between the bottom end of the hydraulic cylinder and the lid in the most closed state, the bottom end of the hydraulic cylinder and the lid in a state where the claw is opened to some extent. The gap between is increased. For this reason, there has been a problem that foreign matter such as scattered or bounced metal pieces or dust may enter the hydraulic cylinder housing chamber and damage the hydraulic cylinder in the processing operation of industrial waste or the like.

  Also, as in Patent Document 1, when the cylinder cover or lid is provided outside the claw, if these plate thicknesses are thin, obstacles, waste, etc. may collide with the cylinder cover or lid or be pressed with a strong force. In this case, since the cylinder cover and the lid body are deformed, it is necessary to secure a certain thickness. For this reason, the weight of a cylinder cover and a cover body also becomes large, and this adds to the weight of a nail | claw and the weight of the whole grapple increases. Here, since the total weight of the grapple and the object to be gripped thereby is limited by the scale of the work machine, when the weight of the grapple increases, the processing capacity of the grapple decreases correspondingly and the same processing amount is obtained. However, there is a problem that a larger working machine capable of withstanding the total weight is required.

  Therefore, a structure in which the claw is hollow and a hydraulic cylinder for opening and closing is accommodated in the claw can be considered. However, even when such a claw opening / closing hydraulic cylinder is housed in the claw, there is still a problem that the bottom end of the hydraulic cylinder is exposed when the claw is closed. In addition, the position of the pivot center of the claw accompanying opening / closing of the claw and the position of the swing center of the bottom side end accompanying expansion / contraction of the hydraulic cylinder are different. It is unavoidable that a large gap is generated between the side end portion and the outer surface plate of the claw root portion, and there is a problem that foreign matter is mixed in the claw and the hydraulic cylinder is damaged as described above.

  In view of the above problems, an object of the present invention is to provide a grapple having a protection means that can prevent a hydraulic cylinder from being damaged by a foreign object such as a metal piece or dust in processing operations such as waste and chips.

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 which form a hollow structure with a quadrangular cross-section, and which are externally fitted to the respective brackets so as to be openable and closable in the inner and outer directions about a pivot shaft;
Housed in each of the claws, one end of the bracket is pivotably connected to a position outside the pivoting shaft in the claw opening / closing direction, and the other end is pivoted to the middle part of the nail A hydraulic cylinder for opening and closing the nail that can be connected and attached,
A fixing cover that is provided on the upper surface of the bracket, covers the upper surface of the bracket, is covered with an outer surface plate of the base portion of the nail when the nail is open, and is exposed when the nail is closed;
The inner edge portion is adjacent to the outer edge portion of the fixed cover and covers the one end portion of the hydraulic cylinder, and the inner edge portion is pivotally attached to the bracket, and the pawl is opened. A movable cover that is covered with an outer surface plate of the claw root portion in a state, a part of the claw is exposed when the claw is closed, and a remaining portion is covered with an outer surface plate of the claw root portion. Features.

The grapple of claim 2 is the grapple of claim 1,
An outer surface of the movable cover in a state where the fixed cover and the claw are closed is configured to have an arc shape centered on the pivot shaft.

The grapple according to claim 3 is the grapple according to claim 1 or 2,
On one side at least one of the outer surface of the inner surface or the bracket side plate of the base portion of the pawl, characterized in that a slide plate which abuts against the other surface.

The grapple of claim 4 is the grapple of claim 3,
The side plate of the claw is provided with a notch, a reinforcing plate that covers the notch is fixed to the outer surface of the side plate, the slide plate is fitted into the notch, and the slide plate is inserted through the reinforcing plate. It is characterized by being fixed and attached by a fixing tool to be inserted.

2. The grapple according to claim 1, wherein when the claw is opened (closed), the movable cover is also moved upward (downward) as the claw is moved upward (downward) and the hydraulic cylinder is moved upward (downward). ). In other words, the movable cover is interlocked so that the movement of the claw and the hydraulic cylinder does not hinder the movement of the claw and the hydraulic cylinder with the opening and closing of the claw and the hydraulic cylinder, so the movable cover always kept a minute gap close to the outer surface plate of the claw root part. Cover one end of the hydraulic cylinder in this state. In this way, the claw outer plate and the fixed cover or movable cover can be kept at a very small distance throughout the claw opening / closing operation, and foreign objects such as metal pieces and dust during operation can be removed. It is possible to prevent the hydraulic cylinder from entering inside and being damaged.

  In addition, since the claw has a hollow structure and the hydraulic cylinder is accommodated therein, the weight of the grapple can be reduced compared to the case where a cylinder cover or a lid is provided on the outer surface of the claw. The processing capacity can be increased and a work can be performed with a relatively large capacity grapple attached using a small working machine, so that the work efficiency can be improved, the economy can be improved, and the energy can be saved.

According to the invention of claim 2, the outer surfaces of the fixed cover and the movable cover in a state where the claw is closed are formed in an arc shape centering on the pivot shaft, so that the claw is in a fully closed state or a state close thereto. Even when the outer surface plate of the claw root part is brought close to the movable cover during the opening / closing operation in the above, they do not interfere with each other. The gap between them can be made smaller, and the entry of foreign matters such as metal pieces and dust into the claws can be more effectively prevented.

According to the invention of claim 3 , since the slide plate comes into contact with and slides on the side plate or the bracket of the plate made of steel plate in accordance with the opening and closing operation of the nail, the abnormal sound when the metal plates make contact and slide Therefore, the gap between the side plate of the claw and the bracket can be reduced, and the entry of foreign matter from the gap between the side plate and the bracket can be prevented. Further, no abnormal noise is generated when the metal plates are in contact with each other and slid, and annoyance due to noise in the vicinity can be prevented. In addition, since the slide plate can be configured to be in close contact with the side plate or bracket of the nail, the backlash between the nail and the bracket is reduced, and the twisting force generated on the nail during work is not limited to the pivot shaft but also the slide plate. The burden on the pivot axis can be reduced.

  According to the invention of claim 4, since the slide plate is fitted between the notch portion provided in the side plate of the base portion of the nail and the reinforcing plate and fixed by the fixture, the side plate of the slide plate Is firmly held, the slide plate can be easily attached, and the vicinity of the attachment portion of the slide plate is reinforced, so that deformation of the slide plate attachment portion can be prevented.

  FIG. 1 is a perspective view showing an embodiment of the grapple of the present invention, FIG. 2 is a perspective view showing a part of the grapple, and FIG. 3 is a plan view of the grapple. The grapple includes two pieces provided at equal intervals in the circumferential direction around an upper structure 1 attached to a working arm (not shown) such as a hydraulic excavator and a lower frame 2 having a cylindrical shape. A plurality of brackets 3 having parallel plates 3a, claws 4 having a hollow structure with a square cross section attached to each bracket 3, and hydraulic cylinders 5 for opening and closing the claws accommodated in the claws 4 and attached thereto. Is provided. 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. Reference numeral 7 denotes a center joint that connects an oil passage between the non-turning portion on the bracket 9 side and the turning portion on the lower frame 2 side in order to supply hydraulic oil to the hydraulic cylinder 5.

  As shown in a perspective view of FIG. 4 and a side view of FIG. The bottom plate 2c is welded to the bottom surface of the cylindrical portion 2a. The parallel plates 3a and 3a constituting the brackets 3 are welded to the cylindrical portion 2a of the lower frame 2. At the positions near the center of the lower frame 2 below the parallel plates 3a and 3a constituting the brackets (inner positions when viewed in the opening and closing direction of the claws 4), there are provided through holes 12 for attaching the claws and parallel to each other. A boss 13 having through holes communicating with the through holes 12 is welded to the opposing surfaces of the lower portions of the plates 3a and 3a. Further, a position above the boss 13 on the facing surface of the pair of parallel plates 3a and 3a constituting the bracket 3 and a position away from the boss 13 from the center side of the lower frame 2 (outside as viewed in the opening and closing direction of the claw 4). At the position), through holes 14 for attaching the hydraulic cylinder 5 are provided, and bosses 15 and 15 communicating with the through holes 14 are welded to the opposing surfaces of the parallel plates 3a and 3a, respectively.

  As shown in FIG. 6, the claw 4 has a quadrangular cross-sectional shape in which an inner surface plate 4a, left and right side plates 4b, and an outer surface plate 4c are integrated by welding. The inner surface plate 4a has an overhanging portion 4a1 projecting left and right from the side plate 4b in order to prevent the grasped object from leaking from between the claws 4 when working on a relatively small gripping object by the claw 4. The amount of overhang of the overhang portion 4a1 is variously changed depending on the work target.

  Further, a through hole 17 for attaching the claw 4 to the bracket 3 and a boss 19 having a through hole communicating with the through hole 17 are provided on the outer surface of the side plates 4b at the bottom of the side plate 4b at the base of the claw 4. Weld. Further, through holes 20 for inserting pins connecting the rod side ends of the hydraulic cylinders are provided in the both side plates 4b in the middle of the claw 4, and these through holes 20 are formed in the inner surfaces of the side plates 4b. The bosses 21 and 21 each having a through hole communicating with each other are welded.

  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 22 (see FIG. 2) and cleaning the inside of the claw 4 at the base part of the side plates 4b. The opening 23 is provided. Also, in the vicinity of the through holes 20 of the side plates 4b, maintenance work such as connecting and disconnecting a hydraulic hose (not shown) to the rod side port 25 (see FIG. 2), cleaning the inside of the claws 4 and the like are performed. The opening 24 is provided. Further, an opening 26 for inserting / removing the hydraulic cylinder 5 when the hydraulic cylinder 5 is attached / removed is provided at an intermediate portion of the outer surface plate 4c. The opening 26 includes an elliptical part 26a that is long in the longitudinal direction of the claw 4 and a narrow semi-oval part 26b that is continuous with the elliptical part 26a and allows the rod part of the hydraulic cylinder 5 to pass therethrough. Further, an elliptical opening 29 for maintenance of the movable cover 27 described later is provided at the root of the outer surface plate 4c. Screw holes 30 are provided around the openings 23, 24, 26, and 29, the openings 23, 24, 26, and 29 are closed by the cover plates 32 to 35, and bolts 31 that are screwed into the screw holes 30. The lid plates 32 to 35 are fixed by the above. Reference numeral 28 denotes a bolt guard welded to the side plate 4b or the outer plate 4c in order to protect the head of the bolt 31.

  The cover plates 32 to 35 are reduced in weight by, for example, about half the thickness (for example, 6 to 9 mm) thinner than the thickness (for example, 19 mm) of the inner surface plate 4a, the side surface plate 4b, and the outer surface plate 4c constituting the claw 4. . Note that the opening 24 in the middle of the side plate 4b is not always necessary because the opening 26 can be substituted when the rod-side port 25 is provided on the upper surface side of the hydraulic cylinder 5.

  The claw 4 is attached to the bracket 3 by aligning the positions of the through hole 17 and the boss 19 at the base of the claw 4 with the through hole 12 and the boss 13 provided at the lower part of the bracket 3. Further, by inserting the pivot shaft 18 into the through holes 12 and 17, the claw 4 is attached to the bracket 3 so as to be openable and closable around the pivot shaft 18.

  The bottom side end of the hydraulic cylinder 5 is fitted with a boss 36 (see FIG. 2) provided at this end between the bosses 15 and 15 provided on the bracket 3, and the connecting shaft 37 is connected to the through-hole 14 and these. The bottom end of the hydraulic cylinder 5 is connected to the bracket 3 so as to be rotatable. Further, the shaft 37 is prevented from coming off by a retaining member (not shown) made of a pin or a bolt inserted into a through hole 38 provided in the radial direction of the boss 15 and a retaining hole (not shown) of the shaft 37. .

  The rod side end of the hydraulic cylinder 5 has a boss 39 (see FIG. 2) provided at this end aligned with the positions of the through hole 20 and the boss 21 provided in the middle of the claw 4, and the through hole 20 and the boss. A shaft 40 is inserted into 21 and 39 and the rod side end of the hydraulic cylinder 5 is rotatably connected to the middle part of the claw 4. Further, the shaft 40 is prevented from coming off by a retaining member (not shown) made of a pin or a bolt inserted into a through hole 41 provided in the boss 21 in the radial direction and a retaining hole (not shown) of the shaft 40. .

  Next, a structure for preventing entry of foreign matter such as metal pieces and dust into the claw 4 will be described. The upper surface portions of the two parallel plates 3a and 3a constituting the bracket 3 are formed in an arc shape so as to be on an arc centered on the pivot shaft 18. An arc centering on a pivot shaft 18 for preventing intrusion of metal pieces, dust and the like between the parallel plates 3a and 3a over a portion from the lower frame 2 to the vicinity of the boss 15 in the arc-shaped upper surface portion. The arc-shaped fixed cover 43 is welded. Further, the lower surfaces of the two parallel plates 3a and 3a are also formed in an arc shape so as to be on an arc centered on the pivot shaft 18, and the base portion of the nail moves from the lower frame 2 as the nail 4 is opened and closed. In order to prevent foreign objects such as metal pieces and dust from entering between the parallel plates 3a and 3a, the arc-shaped fixed cover 44 along the arc is welded. These fixed covers 43 and 44 also serve to reinforce the bracket 3.

  The movable cover 27 is attached as follows. As shown in FIG. 7, a pair of attachment members 45, 46 are arranged in the axial direction of the boss 15 and welded to the upper surfaces of the bosses 15, 15 provided on the bracket 3. Among these members 45 and 46, the member 45 close to the parallel plate 3a side is provided with a through hole 45a, and the other member 46 is provided with a screw hole 46a. The parallel plate portion 3a is provided with a through hole 47 on the same axis as the through hole 45a and the screw hole 46a.

  On the other hand, as shown in the side view of FIG. 8 and the plan view of FIG. 9, mounting pieces 48, 48 for inserting and pivoting between the members 45, 46 are provided on the lower surface of one end side of the movable cover 27. Provided, and through holes 48a are provided in the mounting pieces 48, 48. In addition, the movable cover 27 is supported on the opposite end of the fixed cover 43, that is, on both sides of the lower surface of the outer end, so that the movable cover 27 can be stably supported on the tube of the hydraulic cylinder 5. The member 49 is attached by a fixing tool 50 such as a screw (may be welded), and an arcuate cutout 51 for avoiding the tube of the hydraulic cylinder 5 is provided on the outer end side of the movable cover 27. Further, in order to restrict the position of the movable cover 27 when the claw 4 is closed so as to be on an arc centered on the pivot shaft 18 of the claw 4, the stopper 52 that contacts the bracket 3 is welded. The movable cover 27 is provided with a quadrangular opening 53 for avoiding the boss 36 of the hydraulic cylinder 5.

  The movable cover 27 has an attachment piece 48 fitted between the attachment members 45 and 46 provided on the boss 15, and a shaft 54 (see FIGS. 10 to 13) is inserted from the through hole 47 of the parallel plate portion 3 a of the bracket 3. The shaft 54 is inserted into the through hole 45a of the mounting member 45 and the through hole 48a of the mounting piece 48, and the male screw portion at the tip of the shaft 54 is screwed into the screw hole 46a of the mounting member 46, whereby the boss 15 is rotated. Install as possible. The shaft 54 does not have a male screw portion, and a pin can be used. The inner edge (the edge closer to the lower frame 2) of the movable cover 27 is close to the outer edge of the fixed cover 43.

Next, operations of the fixed cover 43 and the movable cover 27 will be described with reference to cross-sectional views of FIGS. As shown in FIGS. 10 to 13, the outer surface of the fixed cover is configured to have an arc shape centered on the pivot shaft 18 of the claw 4. FIG. 10 shows a state in which the hydraulic cylinder 5 is most contracted, that is, a state in which the claw 4 is fully open. At this time, the root portion of the outer surface plate 4 c is in a position closest to the lower frame 2. At this time, almost all of the fixed cover 43 and all of the movable cover 27 are covered with the outer surface plate 4 c of the claw 4, and a minute gap is maintained between the side surface plate 4 b and the bracket 3. There is no possibility that a foreign object such as a piece or dust will enter the claw 4. The movable cover 27 is in a state where the outer edge portion of the movable cover 27 is lifted up with the flange member 49 at the outer edge portion riding on the tube of the hydraulic cylinder 5.

  When the hydraulic cylinder 5 is extended from this fully opened state and the claw 4 is moved in the closing direction, as shown in FIG. 11, the base portion of the outer surface plate 4c is a fixed cover 43 on an arc centered on the pivot shaft 18. It moves along a top surface of the fixed cover 43 while keeping a minute gap. Therefore, even in this case, there is no possibility that a foreign object such as a metal piece or dust enters the claw 4. As described above, when the root portion of the outer surface plate 4c moves along the fixed cover 43, the tube of the hydraulic cylinder 5 swings downward about the shaft 40. Accordingly, the movable cover 27 has its outer edge. Since the flange member 49 of the part rotates downward about the shaft 54 in a state where it is on the tube of the hydraulic cylinder 5, the movable cover 27 does not interfere with the outer surface plate 4c of the claw 4, and the movement of the claw 4 is prevented. I do not disturb.

  The claw 4 is further closed. As shown in FIG. 12, the claw 4 is provided on the movable cover 27 when the base side end of the outer surface plate 4c exceeds or exceeds the boundary between the fixed cover 43 and the movable cover 27. The stopper 52 abuts on the peripheral portion of the parallel plate 3a of the bracket 3 to prevent further downward rotation of the movable cover 27. At this time, the outer edge portion of the fixed cover 43 and the inner edge portion of the movable cover 27 are closest to each other to prevent intrusion of foreign matters such as metal pieces and dust from between them. At this time, the movable cover 27 is on an arc centered on the pivot shaft 18.

  When the claw 4 is further closed from the state of FIG. 12, the root side end portion of the outer surface plate 4c of the claw 4 moves along the arc of the upper surface of the movable cover 27 while maintaining a certain minute interval. In addition, as shown in FIG. 13, intrusion of foreign matters such as metal pieces and dust from between the claw 4 and the movable cover 27 is prevented while the claw 4 is in the most closed state. In a state where the claw 4 is most closed as shown in FIG. 13, a part of the movable cover 27 is exposed without being covered by the outer surface plate 4c of the claw 4, and the remaining portion is covered by the outer surface plate 4c.

  As described above, the grapple of this embodiment includes the fixed cover 43 and the movable cover 27, and the outer surface plate 4c of the claw 4 is used for the bracket 3 and the hydraulic cylinder 5 in the entire process of opening and closing the claw 4. The cover 27, 43 covering the bottom side end portion can be covered with a minute interval.

  That is, in this grapple, when the claw 4 is closed (opened), the movable cover is moved along with the movement of the outer surface plate 4c downward (upward) and the swing of the hydraulic cylinder 5 downward (upward). 27 also pivots downward (upward) in conjunction with it, so that the movable cover 27 is always in a position that does not hinder the movement of the claw 4 and the hydraulic cylinder 5 with the opening and closing operations of the claw 4 and the hydraulic cylinder 5. For this reason, the movable cover 27 covers the bottom end of the hydraulic cylinder 5 while maintaining a minute gap that is always close to the outer surface plate 4c at the base of the claw 4, so that the claw 4 can be opened and closed over the entire range. Foreign matters such as metal pieces and dust can be prevented from entering the claw 4, and damage to the hydraulic cylinder 5 due to foreign matters such as metal pieces and dust entering the claw 4 can be prevented.

  Further, since the hydraulic cylinder 5 is accommodated in the hollow claw 4, the grapple can be reduced in weight as compared with the case where a cylinder cover or a lid is provided on the outer surface of the claw 4. The processing capacity can be increased, and a relatively large-capacity grapple can be attached using a small working machine, so that work efficiency can be improved, economy and energy saving can be achieved.

  The fixed cover 43 and the movable cover 27 can be flat, but it is ideal that the fixed cover 43 and the movable cover 27 have an arc shape around the pivot shaft 18 as in this embodiment. That is, since the fixed cover 43 has an arc shape, the outer surface plate 4c of the claw 4 and the fixed cover 43 do not interfere with each other in the first half of the closing operation of the claw 4, and the distance between the two is kept at a small constant gap. be able to. In the latter half of the closing operation of the claw 4, the outer surface of the movable cover 27 has an arc shape centered on the pivot shaft 18, so that the end of the outer surface plate 4 c at the base of the claw is brought close to the movable cover 27. Even in the case where they do not interfere with each other, the gap between the outer surface plate 4c at the base of the claw 4 and the movable cover 27 can be further reduced, Intrusion of foreign matters such as metal pieces and dust is more effectively prevented.

  Next, the slide plate provided between the inner surface of the side plate 4b of the claw 4 and the outer surface of the parallel plate 3a of the bracket 3 will be described. As shown in FIGS. 6 and 14, a notch 56 for attaching the slide plate 55 is provided on the base side of the side plate 4 b of the claw 4. Reference numeral 57 denotes a reinforcing plate fixed by a side plate 4b so as to cover the outer surface side of the notch 56. The reinforcing plate 57 covers the notch 56 and is provided along the edge on the side of the outer surface plate 4 c around the opening 23 from the vicinity thereof, thereby reinforcing the base portion around the opening 23. As shown in FIG. 15, the slide plate 55 is made of a hard synthetic resin. The slide plate 55 is fitted into the notch 56 so as to be in contact with the inner surface of the reinforcing plate 57, and a bolt 60 is inserted into a through hole 59 provided in the reinforcing plate 57. The screw hole 61 provided in the slide plate 55 is screwed and fastened to be fixed to the notch 56. 62 is a bolt guard welded to the reinforcing plate 57 in order to protect the head of the bolt 60.

  When such a slide plate 55 is provided, the synthetic resin slide plate 55 comes into contact with and slides on the parallel plate 3a of the bracket 3 made of a steel plate as the pawl 4 opens and closes, so that the metal plates come into contact with each other. Therefore, the noise between the side plate 4b and the bracket 3 of the claw 4 can be made small, and foreign matter from the gap between the side plate 4b and the bracket 3 can be reduced. Intrusion can be prevented, and inconvenience due to noise in the vicinity can be prevented. Further, since the slide plate 55 can be configured to be in close contact with the bracket 3, the backlash between the claw 4 and the bracket 3 is reduced, and the twisting force generated on the claw 4 during the work is not limited to the pivot shaft 18, but the slide. It can also be carried by the plate 55, and the burden on the pivot shaft 18 is reduced.

  The slide plate 55 can also be provided on the outer surface of the parallel plate 3a of the bracket 3. However, in this embodiment, the slide plate 55 is provided between the notch 56 and the reinforcing plate 57 provided on the side plate 4b at the base of the claw 4. Since the slide plate 55 is fitted and fixed by the bolt 60, the slide plate 55 is firmly held by the side plate 4b, the slide plate 55 can be easily attached, and the mounting portion of the slide plate 55 is attached. Since the vicinity is reinforced, deformation of the mounting portion of the slide plate 55 can be prevented.

  The notch 56 may be provided in the shape of an opening having a closed periphery, instead of being provided in a cut shape as in this embodiment.

  The grapple according to the present invention can be used as a structure in which the grapple is attached not to the working arm of the working machine so as to be pivotable by a hydraulic cylinder but to be suspended.

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 top view of the grapple of this embodiment. It is a perspective view which shows the lower frame of the upper structure of the grapple of this embodiment. It is a side view which shows the lower frame of the upper structure of the grapple of this embodiment. It is a perspective view which shows the nail | claw of this embodiment. It is a perspective view which shows the attaching part of the movable cover of this embodiment. It is a side view which shows the movable cover of this embodiment. It is a top view which shows the movable cover of this embodiment. It is sectional drawing which shows the positional relationship of a nail | claw and a hydraulic cylinder, a fixed cover, and a movable cover in the fully open state of the nail | claw of this embodiment. It is sectional drawing which shows the positional relationship of a nail | claw and a hydraulic cylinder, a fixed cover, and a movable cover in the state of the first half of the nail | claw closing operation of this embodiment. It is sectional drawing which shows the positional relationship of a nail | claw and a hydraulic cylinder, a fixed cover, and a movable cover in the second half state of the nail | claw closing operation of this embodiment. It is sectional drawing which shows the positional relationship of a nail | claw and a hydraulic cylinder, a fixed cover, and a movable cover in the fully closed state of the nail | claw of this embodiment. It is a perspective view which shows the attaching part of the slide plate of this embodiment. It is sectional drawing which shows the attachment structure of the slide plate of this embodiment.

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, 15: boss, 17: through hole, 18: pivoting shaft, 19: boss, 20: through Hole, 21: boss, 22, 25: port, 23, 24, 26, 29: opening, 27: movable cover, 28: bolt guard, 30: screw hole, 31: bolt, 32-35: lid plate, 36 : Boss, 37: Shaft, 38: Through hole, 39: Boss, 40: Shaft, 41: Through hole, 43, 44: Fixed cover, 45, 46: Mounting member, 47: Through hole, 48: Mounting piece, 49 : Collar member, 50: fixing tool, 51: notch, 52: stopper, 53: Mouth, 54: shaft, 55: slide plate, 56: notch, 57: reinforcing plate 59: through hole, 60: bolt, 61: screw hole, 62: bolt guard

Claims (4)

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 which form a hollow structure with a quadrangular cross-section, and which are externally fitted to the respective brackets so as to be openable and closable in the inner and outer directions about a pivot shaft;
Housed in each of the claws, one end of the bracket is pivotably connected to a position outside the pivoting shaft in the claw opening / closing direction, and the other end is pivoted to the middle part of the nail A hydraulic cylinder for opening and closing the nail that can be connected and attached,
A fixing cover that is provided on the upper surface of the bracket, covers the upper surface of the bracket, is covered with an outer surface plate of the base portion of the nail when the nail is open, and is exposed when the nail is closed;
The inner edge portion is adjacent to the outer edge portion of the fixed cover and covers the one end portion of the hydraulic cylinder, and the inner edge portion is pivotally attached to the bracket, and the pawl is opened. A movable cover that is covered with an outer surface plate of the claw root portion in a state, a part of the claw is exposed when the claw is closed, and a remaining portion is covered with an outer surface plate of the claw root portion. A characteristic grapple. The grapple according to claim 1,
The grapple, wherein an outer surface of the movable cover in a state in which the fixed cover and the claw are closed is configured to have an arc shape centered on the pivot shaft. The grapple according to claim 1 or 2,
On at least one side of the outer surface of the inner surface or the bracket side plate of the base portion of the pawl, characterized in that a slide plate which abuts against the other surface grapple. The grapple according to claim 3,
The side plate of the claw is provided with a notch, a reinforcing plate that covers the notch is fixed to the outer surface of the side plate, the slide plate is fitted into the notch, and the slide plate is inserted through the reinforcing plate. A grapple that is fixedly attached by a fixing tool to be inserted.

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