JP2011063952A - Clamshell bucket device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a clamshell bucket device enabling a clamshell bucket used as an attachment to be manufactured at low cost. <P>SOLUTION: This clamshell bucket device includes a connection member (23) for rotatably connecting right and left side buckets (21a, 21b) to each other. A suspension member (27) is suspendedly connected to the front end of the arm (6) of a construction machine, and engagement members (25) engageable with each other are provided to the upper part of the connection member (23) and the lower part of the suspension member (27), respectively. The suspension member is a vertically elongated sling (27), and engagement members (25) engageable with each other are provided to the lower part of the sling (27) and the upper part of the connection member (23), respectively. Hydraulic cylinders (30) for opening and closing the right and left side buckets (21a, 21b) are provided to the sling (27). <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  TECHNICAL FIELD The present invention relates to a construction machine such as a hydraulic excavator and a hydraulic crane, and in particular, a clamshell bucket apparatus attached to the tip of an arm of a construction machine for excavating a vertical shaft or discharging sludge volume in a drainage ditch, lake or the like. It is about.

  As a conventional technique, there is a technique shown in Patent Document 1, that is, FIG. In FIG. 13, reference numeral 1 denotes a hydraulic excavator, and an upper swing body 3 having a cab 4, an engine and the like is mounted on a crawler-type lower traveling body 2 so as to be able to swing, and a boom 5 can be raised and lowered on the upper swing body 3. The arm 6 is connected to the front end portion of the boom 5 so as to be rotatable up and down, and the clamshell bucket apparatus 10 is suspended and connected to the front end portion of the arm 6.

  The clamshell bucket device 10 has a pair of standard buckets 11a and 11b formed in a triangular shape facing left and right, and a pin P1 is attached to a movable bracket 13 whose upper side is fixed to the lower end of the rod 12b of the hydraulic cylinder 12. The upper left and right intermediate portions and the upper portion of the tube 12a of the hydraulic cylinder 12 are rotatably connected via a pair of left and right links 14a and 14b and pins P2 and P3. Also, wide additional buckets 15a and 15b are attached to the lower portions of the standard buckets 11a and 11b.

  The upper end of the tube 12 a of the hydraulic cylinder 12 is pin-connected to the lower end of the arm 6 of the hydraulic excavator 1 via the joint 7 so that the clamshell bucket device 10 is suspended and connected to the distal end of the arm 6.

  In Patent Document 1, the movable bracket 13 is fixed to the lower end of the rod 12b of the hydraulic cylinder 12, and the left and right standard buckets 11a and 11b are connected to the movable bracket 13 via the pin P1. When exchanging the bucket, the standard buckets 11a and 11b and the hydraulic cylinder 12 are detached from the arm 6 in a unit state, and when attaching another type of bucket to the arm 6, the bucket and this It is necessary to install the hydraulic cylinder corresponding to

  For this reason, in Patent Document 1, if it is attempted to manufacture various types of clamshell buckets in order to correspond to the groove width of the drainage groove or the diameter of the shaft, the manufacturing cost thereof becomes expensive. It was.

JP 2002-194765 A

  An object of this invention is to obtain the novel clamshell bucket apparatus which the manufacturing cost of the clamshell bucket used as an attachment reduces.

The present invention is configured as follows to achieve the above object. In other words, the invention according to claim 1 is provided with a connecting member that rotatably connects the left and right buckets, the suspension member is suspended and connected to the arm tip of the construction machine, and the upper portion of the connecting member and the suspension member are connected to each other. An engaging member that can be engaged and disengaged with each other is provided on the lower portion.
According to a second aspect of the present invention, the suspension member has a vertically long suspension fitting, an engaging member that can be engaged with and disengaged from each other is provided at a lower portion of the suspension fitting and an upper portion of the connecting member, and left and right buckets are attached to the suspension fitting. A hydraulic cylinder that opens and closes is provided.
According to a third aspect of the present invention, there is provided a lock device that holds the open state of the left and right buckets.

  In the invention according to claim 1 of the present application, the left and right buckets are rotatably connected by the connecting member, and the connecting member is attached to and removed from the suspension member provided at the arm tip of the construction machine. A hydraulic cylinder for opening and closing the bucket is separated from the bucket and attached to the arm side, and the hydraulic cylinder can be used for different types of buckets. Thereby, the production cost of many types of clamshell buckets with different formats can be reduced.

  Since the invention according to claim 2 is provided with the connecting member that connects the left and right buckets to the suspension fitting provided at the arm tip, and the hydraulic cylinder that opens and closes the left and right buckets, various types of clamshells of different types The manufacturing cost of the bucket can be reduced, and the left and right buckets can always be opened and closed around the vertical axis of the hanging bracket, so that the attitude of the excavation operation or the discharge operation of the clamshell bucket is stabilized.

  In the invention according to claim 3, when the locking device is operated, the open state of the left and right buckets is maintained. As a result, the clamshell bucket is stably placed on the ground, and the clamshell bucket can be safely attached to and detached from the construction machine.

1 is a front view of a hydraulic excavator to which a clamshell bucket of the present invention is applied. It is a front view of the clamshell bucket part of FIG. It is a front view of a clamshell bucket part, (A) is a front view which shows the open state of a clamshell bucket, (B) is the principal part expanded sectional view. It is a front view of the suspension member part from which the clamshell bucket was removed. It is a front view which shows the open state of a clamshell bucket single-piece | unit. FIG. 6 is a cross-sectional view corresponding to VI-VI in FIG. 5. It is a front view which shows the open state of the clamshell bucket simple substance for vertical shafts. FIG. 8 is a plan view of FIG. 7. It is a front view of a clamshell bucket part, (A) is a front view which shows the 2nd example of the engaging part of a connection member and a suspension member, (B) is the principal part expanded sectional view. It is a front view which shows the 3rd example of the engaging part of a connection member and a suspension member. It is a principal part expanded sectional view equivalent to XI-XI of FIG. It is a front view of a clamshell bucket part, (A) is a front view which shows the 4th example of the engaging part of a connection member and a suspension member, (B) is the principal part expanded sectional view. It is a front view of a hydraulic excavator to which a conventional clamshell bucket is applied.

  In FIG. 1, reference numeral 1 denotes a hydraulic excavator. As in the prior art, an upper swing body 3 having a cab 4, an engine and the like is mounted on a crawler type lower traveling body 2 so as to be swingable. The arm 6 is connected to the tip of the boom 5 so as to be vertically rotatable.

  A clamshell bucket device 20 is suspended and connected to the tip (lower end) of the arm 6. The clamshell bucket device 20 discharges sludge that has accumulated in a drain or a lake, and is configured as shown in FIGS. That is, a pair of left and right buckets 21 (21 a, 21 b) having a rectangular shape in plan view are faced and connected to the connecting member 23 via the link mechanism 22 so as to be rotatable. The connecting member 23 supports two base members (facing sides of the buckets 21a and 21b) of the link mechanism 22 by disposing two plate members formed in a trapezoidal shape in a front view in the front-rear direction.

  A rectangular contact plate 24 is fixed to the upper end of the connecting member 23, and a lower engagement piece 25b forming the other of the engagement members 25 is fixed to the left and right ends of the contact plate 24 in FIG. The lower engagement piece 25b is formed by opposing metal fittings bent in an inverted L shape.

  On the other hand, a vertically elongated suspension fitting (suspending member) 27 is pivotably connected to the lower end portion of the arm 6 via a joint 7 so that one of the engagement members 25 is formed at the lower end portion of the suspension fitting 27. The engagement piece 25a is fixed. As shown in FIG. 3, the upper engagement piece 25a is made of a rectangular sheet metal material, and its left and right ends protrude outward from the lower end of the suspension metal fitting 27, and the lower engagement piece 25b is engaged with the protrusion. Fit (mating).

  Then, as shown in FIG. 3B, after the bolt 26 is inserted into the lower engagement piece 25b and then the upper engagement piece 25a from the upper side, its lower end is screwed into the contact plate 24, and the lower engagement piece By elastically deforming the upper piece 25b-1 of 25b, the upper engagement piece 25a is sandwiched between the upper piece 25b-1 and the contact plate 24.

  A hydraulic cylinder 30 (30-1, 30-2) for operating the bucket 21 is connected to the suspension fitting 27. As shown in FIG. 2, two hydraulic cylinders 30 are arranged on the left and right (front and rear) corresponding to the buckets 21a and 21b of the suspension fitting 27, and the left hydraulic cylinder 30-1 is the end of the rod 30b. A portion (upper end) is pivotally connected to the upper end portion of the hanging metal fitting 27 via a pin P5, and the head (lower end) of the cylinder 30a is connected to the left link 22a for rotating the left bucket 21a. It connects so that rotation is possible. Similarly, the end of the rod 30b of the right hydraulic cylinder 30-2 is rotatably connected to the upper end of the suspension fitting 27 via a pin P5, and the head of the cylinder 30a is connected to the right bucket 21b. The right link 22b to be rotated is rotatably connected via a pin P6.

  Further, as shown in FIGS. 5 and 6, a lock device 33 is provided for holding the left and right buckets 21a and 21b in an open state. That is, as shown in FIG. 6, when the left and right buckets 21 a and 21 b are opened at a predetermined angle to the connecting member 23 and the right link 22 b of the link mechanism 22, in this example, when fully opened. Are formed, and a lock pin 35 is provided in the pin hole 34 so as to be detachable. Reference numeral 36 denotes a retaining pin for the lock pin 35.

  The locking device 33 is used when the bucket (clamshell bucket) 21 is attached to or detached from the arm 6 of the excavator 1, and the left and right buckets 21a and 21b are held open by the locking device 33. By doing so, the bucket 21 is stably placed on the ground, and the engagement / disengagement operation of the engagement member 25 and the engagement / disconnection operation of the bucket 21 and the hydraulic cylinder 30 can be performed safely. In addition, you may make it form the pin hole 34 mentioned above in the connection member 23 and the left part link 22a.

  7 and 8, reference numeral 20-1 denotes a clamshell bucket device that excavates a vertical shaft. These are connected to the connecting member 23 via the link mechanism 22 similar to that described above in a rotatable manner. The rest of the structure is substantially the same as that shown in FIGS.

  FIG. 9 shows a second example of the engaging member 25. That is, the end of the flat upper engagement piece 25a fixed to the lower end of the hanging bracket 27 is protruded laterally from the hanging bracket 27, and a plurality of bolt holes are formed at a predetermined pitch in the protruding portion. Screw holes that face the bolt holes are formed in a flat plate-like lower engagement piece 25b fixed to the upper end of the member 23. In this state, as shown in FIG. 9B, the upper engagement piece 25a is overlapped with the lower engagement piece 25b so that each bolt hole and the screw hole are aligned, and the bolt 26 is directed from the bolt hole to the screw hole. The lower engagement piece 25a and the lower engagement piece 25b are integrally connected by screwing the lower end portion into the screw hole.

  10 and 11 show a third example of the engaging member 25. That is, the flat upper engaging piece 25a is fixed to the lower end of the hanging metal fitting 27, and both side ends projecting laterally from the hanging metal fitting 27 are arranged such that the upper surface 25a-2 has a left edge to a right edge as shown in FIG. The wedge piece 25a-1 is inclined upward toward the top. On the other hand, a pair of hook-shaped lower engagement pieces 25b fitted and locked to the respective wedge pieces 25a-1 are fixed to both side ends of the flat contact plate 24 fixed to the upper end of the connecting member 23, The lower engagement piece 25b is fitted to the wedge piece 25a-1, and the lower engagement piece 25b is tightened to the right (in the press-fitting direction) in FIG. The lower engagement piece 25b is integrally connected. The rest of the structure is substantially the same as that shown in FIGS.

  FIG. 12 shows a fourth example of the engaging member 25. That is, the suspension fitting 27 is formed of a pipe material, and the hollow fitting portion 25a at the lower end portion thereof is used as an upper engagement piece in the present application. As shown in FIG. Directional pin holes are formed. On the other hand, a stepped pipe-like lower engagement piece 25b fitted to the hollow fitting portion 25a is erected and fixed at the center of a flat contact plate 24 fixed to the upper end of the connecting member 23. The upper part of the small diameter side of the joining piece 25b is fitted into the hollow fitting part 25a, the connecting pin 28 is inserted into the pin hole, the retaining pin 29 is inserted into the end of the connecting pin 28, and the upper engagement The joining piece 25a and the lower engaging piece 25b are integrally connected. The rest of the structure is substantially the same as that shown in FIGS.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Lower traveling body 3 Upper revolving body 4 Driver's cab 5 Boom 6 Arm 20 Clamshell bucket device 21 Clamshell bucket 21a Left bucket 21b Right bucket 22 Ring mechanism 23 Connecting member 24 Contact plate 25 Engagement Member 25a Upper engagement piece 25b Lower engagement piece 25b-1 Upper piece 26 Bolt 27 Hanging bracket 28 Connecting pin 29 Retaining pin 30 Hydraulic cylinder 30a Cylinder 30b Rod 31a, 31b Bracket 33 Locking device 34 Pin hole 35 Lock pin 36 Removal Set pin

Claims (3)

A connecting member for rotatably connecting the left and right buckets is provided, a suspension member is suspended and connected to the tip of the arm of the construction machine, and the upper part of the connection member and the lower part of the suspension member can be engaged with each other. A clamshell bucket device characterized by providing a joint member. The suspension member has a vertically long suspension fitting, an engaging member that can be engaged with and disengaged from each other is provided at the lower portion of the suspension fitting and the upper portion of the connecting member, and a hydraulic cylinder that opens and closes the left and right buckets is provided on the suspension fitting. The clamshell bucket device according to claim 1. The clamshell bucket device according to claim 1 or 2, further comprising a lock device that holds the left and right buckets in an open state.

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