JP6211324B2 - Construction machine bucket mounting structure and construction machine - Google Patents

Description

  The present invention relates to a bucket mounting structure for a construction machine such as a power shovel and the construction machine.

  Conventionally, as a structure for attaching a bucket of a construction machine such as a power shovel, a fixed jaw portion and a movable jaw portion that are open at one end are respectively connected to two bucket connecting pins provided at a predetermined interval in the rear portion of the bucket. After combining, the movable jaw part is fixed by driving a screw or the like (for example, refer to Patent Document 1) or a structure that urges the movable jaw part away from the fixed jaw part by a regulating material and a coil spring or the like. A structure in which the movable jaw is urged away from the fixed jaw by a dedicated hydraulic cylinder (see, for example, Patent Document 2). ) Has been proposed.

JP 2011-231505 A Utility Model Registration No. 3134696 Japanese Patent Laid-Open No. 2006-169886

  However, in the bucket mounting structure of the construction machine described in Patent Documents 1 to 3, after the bucket connecting pin is engaged with the fixed jaw portion and the movable jaw portion that are open at one end, the regulating member, the coil spring, and the screw Alternatively, since it is necessary to urge the movable jaw portion away from the fixed jaw portion by a hydraulic cylinder or the like, there is a problem that the cost increases accordingly.

  In addition, although the movable jaw portion is urged away from the fixed jaw portion by a screw or a hydraulic cylinder, one end of the fixed jaw portion and the movable jaw portion with which the bucket connecting pin is engaged is opened. As a result, the bucket connecting pin may come off.

  Therefore, the present invention has been made paying attention to such a problem, and a drive actuator such as a screw or a hydraulic cylinder for operating the movable jaw is unnecessary, and the cost can be reduced, and the movable jaw and the movable jaw can be moved. An object of the present invention is to provide a bucket mounting structure for a construction machine and a construction machine that can reliably prevent the bucket connecting pin from coming off from the jaw part.

In order to solve the above-described problems, the bucket mounting structure for a construction machine according to the present invention includes a front end portion of an operating arm of a construction machine such as a power shovel on each of two bucket connecting pins provided at a predetermined interval on the rear side of the bucket. A bucket mounting structure for a construction machine that attaches a bucket by engaging a fixed jaw portion attached to a movable jaw portion attached via a bucket link to a piston tip portion extending and contracting from a bucket drive cylinder, Each of the fixed jaw portion and the movable jaw portion has a semicircular arc engaging portion having a semicircular arc cross section corresponding to the outer peripheral surface of the bucket connecting pin with one end open, and a connecting pin is provided on the semicircular arc engaging portion. after engaged, sectional semicircular semicircular supporting the bucket connecting pin between closes the one open end side of the semicircular engaging portion and the semicircular engaging portion The fixed jaw part and the semi-arc-shaped closing part of the movable jaw part are respectively a first rotating semi-arc-shaped closing part piece and a second rotating semi-arc-like closing part piece. And the first and second semicircular arc closure pieces of the semicircular arc closure part of the fixed jaw part and the movable jaw part, The base end side is pivotally connected to the distal end side of the second rotational semicircular arc-shaped closing piece via the pivot pin, while the distal end side is semi-corresponding to the outer peripheral surface of the bucket coupling pin. An arcuate abutting portion, and a bucket connecting pin is sandwiched and supported between the semicircular arc abutting portion and the semi-arc-shaped engaging portion of the fixed jaw portion or the movable jaw portion; Each of the second rotating semicircular arc-shaped closing portions of the semicircular arc-shaped closing portion of the movable jaw portion and the movable jaw portion is The base end side of the first rotating semicircular arc-shaped closing piece is rotatably connected via a moving pin, while the base end side is connected to the fixed jaw portion or the movable jaw portion via a rotating shaft. A bucket that is pivotally attached and is between the semicircular contact portion of the first rotational semicircular arc-shaped closing piece and the semicircular engagement portion of the fixed jaw or the movable jaw. When supporting with the connecting pin in between, the inner surface between the rotating pin and the rotating shaft of the second rotating semicircular arc-shaped closing piece abuts the outer peripheral surface of the semicircular engaging portion. It is characterized by touching.
Here, the semicircular arc contact portion of the first rotating semicircular arc-shaped closing portion piece and the fixed jaw portion constituting the semicircular arc-shaped closing portion of each of the fixed jaw portion and the movable jaw portion, and It is preferable to provide an insertion / removal type lock pin that locks a state in which the bucket connecting pin is supported between the movable arc part and the semicircular arc engaging part .
The movable jaw portion is slidably provided with respect to the fixed jaw portion, and after the semicircular arc engaging portion of the fixed jaw portion is engaged with one bucket connecting pin, the movable jaw portion Is preferably slid with respect to the fixed jaw portion so that the semicircular arc engaging portion of the movable jaw portion is engaged with the other bucket connecting pin.
Further, the movable jaw portion is provided so as to be rotatable with respect to the fixed jaw portion via a fulcrum pin, and the semicircular arc engaging portion of the fixed jaw portion is engaged with one bucket connecting pin. After that, it is further preferable that the movable jaw portion is rotated along the fulcrum pin with respect to the fixed jaw portion, and the semicircular arc engaging portion of the movable jaw portion is engaged with the other bucket connecting pin.
A construction machine according to the present invention includes the above-described bucket mounting structure for a construction machine.

  In the bucket mounting structure of a construction machine and the construction machine according to the present invention, each of the fixed jaw portion and the movable jaw portion has a semicircular arc engaging portion having a semicircular arc cross section corresponding to the outer peripheral surface of the bucket connecting pin with one end open. And, after engaging the connecting pin with the semicircular arc engaging portion, close one end open side of the semicircular arc engaging portion to support the packet connecting pin with the semicircular arc engaging portion Because it has a semicircular arc-shaped blocking section that has a semicircular cross section, a driving actuator such as a screw or a hydraulic cylinder for operating the movable jaw is unnecessary, and costs can be reduced, and the bucket connecting pin can be connected to the fixed jaw portion and the movable jaw portion. Can be reliably prevented from coming off.

It is a front view which shows the state at the time of attaching a bucket to an operation arm via the bucket mounting structure of the construction machine which concerns on this invention. It is a top view of the bucket mounting structure of the construction machine which concerns on this invention. It is a bottom view of the bucket attachment structure of the construction machine which concerns on this invention. It is sectional drawing of the bucket attachment structure of the construction machine which concerns on this invention. It is sectional drawing which shows the operation state (state which only the fixed jaw part engaged with the connection pin) of the bucket mounting structure of the construction machine which concerns on this invention. It is sectional drawing which shows the operation state (state in which the fixed jaw part and the movable jaw part were engaged with the connection pin) of the bucket mounting structure of the construction machine which concerns on this invention. It is sectional drawing which shows the operation state (The state before supporting the connection pin by the rotation type semicircle-shaped obstruction | occlusion part and inserting a lock pin) of the bucket mounting structure of the construction machine which concerns on this invention. It is sectional drawing which shows the operation state (The state after supporting the connection pin by the rotation type semicircle-shaped obstruction | occlusion part and inserting a lock pin) of the bucket mounting structure of the construction machine which concerns on this invention. It is sectional drawing which shows in detail the support state of the connection pin by a rotation type semicircular arc-shaped obstruction | occlusion part. It is sectional drawing which shows the bucket attachment structure (storing state of a slide type semi-arc-shaped obstruction | occlusion part) of the construction machine which uses a slide type semi-arc-form obstruction | occlusion part etc. instead of a two-stage rotation type semi-arc-form obstruction | occlusion part. A bucket mounting structure for a construction machine that uses a sliding semicircular arc-shaped blocking portion in place of a two-stage rotating semicircular arc-shaped blocking portion (state after the connection pin is supported by the sliding semicircular arc blocking portion) is shown. It is sectional drawing. (A)-(c) It is sectional drawing which shows the retracted state, slide state, and connection pin support state of a slide-type semicircular arc-shaped closed part, respectively. It is explanatory drawing which shows the example which applied the bucket attachment structure of the construction machine which concerns on this invention to the construction machine with which the movable jaw part was rotatably attached to the fixed jaw part via the fulcrum pin. It is explanatory drawing which shows the other example which applied the bucket attachment structure of the construction machine which concerns on this invention to the construction machine with which the movable jaw part was rotatably attached to the fixed jaw part via the fulcrum pin. It is explanatory drawing which shows the other example which applied the bucket attachment structure of the construction machine which concerns on this invention to the construction machine with which the movable jaw part was rotatably attached to the fixed jaw part via the fulcrum pin.

  Hereinafter, a construction machine and a bucket mounting structure (device or mechanism) 1 according to an embodiment of the present invention will be specifically described with reference to the drawings.

<Configuration of construction machine bucket mounting structure 1>
As shown in FIG. 1, a bucket mounting structure 1 for a construction machine according to the present invention includes a construction machine such as a power shovel on each of two bucket connecting pins 2a and 2b provided at a predetermined interval at a rear portion of a bucket 2. A fixed jaw portion 1a attached to the distal end portion of the actuating arm 3a (not shown) and a movable jaw portion 1b attached to the distal end portion of the piston 3b1 extending and contracting from the bucket drive cylinder 3b via the bucket link 3c are engaged. Thus, the bucket 2 is attached. In FIG. 1, reference numeral 3d indicates that the base end portion is rotatably connected to the operating arm 3a, while the tip end portion is at the tip end portion of the piston 3b1 extending and contracting from the bucket drive cylinder 3b and the base end portion of the bucket link 3c. It is an arm link connected so that rotation is possible. The bucket 2 other than the bucket mounting structure 1, the operation arm 3 a, the bucket drive cylinder 3 b, the bucket link 3 c, the arm link 3 d, and the like are the same as the conventional one and are well known.

  As shown in FIGS. 1 to 8, the bucket mounting structure 1 according to the embodiment of the present invention includes a fixed jaw portion 1a and a movable jaw portion 1b.

  As shown in FIG. 4, the fixed jaw portion 1a is rotatably connected to the distal end portion of the working arm 3a of the construction machine via the fixed jaw connecting pin 3a1. A fixed-side hook plate 1a3 is attached to the lower end of 1a1 via a first fixed substrate 1a2.

  The fixed-side hook plate 1a3 includes a semicircular arc engaging portion 1a31 having an open end that engages with the bucket connecting pin 2a and a substantially arcuate cross section corresponding to the outer peripheral surface of the bucket connecting pin 2a, and a detachable lock pin 1a33. Is inserted into the lock pin insertion / removal hole 1a32 into which the pin is inserted, and is pivotally connected by the rotation pin 1a37. The two-stage rotation type half which supports the bucket connection pin 2a by rotating through the rotation shaft 1a34. A first rotating semicircular arc closing portion piece 1a35 and a second rotating semicircular arc closing portion piece 1a36 constituting an arcuate closing portion, and a handle 1a38 are provided.

  In other words, as shown in FIGS. 8 and 9, the first rotation type semicircular arc-shaped closing piece 1a35 has a proximal end side through the rotation pin 1a37 and the distal end side of the second rotation type semicircular arc-shaped closing piece 1a36. And a semicircular contact portion 1a35a corresponding to the outer peripheral surface of the bucket connection pin 2a on the tip side, and the semicircular shape of the semicircular contact portion 1a35a and the fixed jaw portion 1a. The bucket connecting pin 2a is sandwiched and supported between the arcuate engaging portions 1a31.

  As shown in FIGS. 8 and 9, the second rotating semicircular arc-shaped closing piece 1 a 36 rotates at the distal end side to the proximal end side of the first rotating semicircular arc-shaped closing piece 1 a 35 via the rotation pin 1 a 37. The base end side is rotatably attached to the fixed jaw portion 1a via the rotation shaft 1a34 while being connected to be movable. Then, the insertion / removal type lock pin 1a33 is inserted into the insertion / removal hole 1a32 for the lock pin, and the semicircular arc contact portion 1a35a of the first rotation type semicircular arc closing portion 1a35 and the semicircular arc engagement portion of the fixed jaw portion 1a. When the bucket connecting pin 2a is supported between the rotating pin 1a31 and the rotating pin 1a37, the rotating pin 1a37 and the rotating shaft 1a34 in the second rotating semicircular arc-shaped closing piece 1a36 as shown in FIG. The inner surface 1a36a abuts on the outer peripheral surface 1a31a of the semicircular arc engaging portion 1a31 and receives a force applied to the bucket connecting pin 2a via the semicircular arc engaging portion 1a31. In addition, when supporting with the bucket connecting pin 2a sandwiched in this way, the end portions on both sides of the first rotating semicircular arc-shaped closing portion 1a35 and the semicircular arc engaging portions 1a31 on both sides of the fixed jaw portion 1a. In this embodiment, as shown in FIGS. 8 and 9, which will be described later, both ends of the first turning semicircular arc-shaped closing piece 1a35 may be contacted with the end portion. And the both end portions of the semicircular arc engaging portion 1a31 of the fixed jaw portion 1a are not in contact with each other, and the inner peripheral surface between both end portions securely holds the bucket connecting pin 2a in close contact from both sides.

  Further, the second fixed substrate 1a4 is joined to the first fixed substrate 1a2 at a predetermined angle by welding or the like, and the movable jaw portion 1b is illustrated along the second fixed substrate 1a4 on the second fixed substrate 1a4. 4 A slide guide hole 1a41 for sliding in the upward X direction is formed.

  As shown in FIG. 1, the movable jaw portion 1b is attached to the tip of a piston 3b1 extending and contracting from the bucket drive cylinder 3b via a bucket link 3c, and is slidable with respect to the fixed jaw portion 1a. Specifically, as shown in FIG. 4, the movable jaw portion 1 b is connected to the tip end portion of the bucket link 3 c via a bucket coupling pin 2 c 1 so that the movable side coupling portion 1 b 1 is rotatable. A movable hook plate 1b3 is attached to the lower end of the portion 1b1 via a slide substrate 1b2.

  The movable hook plate 1b3 is rotatably connected by a semicircular arc engaging portion 1b31 that engages with the bucket connecting pin 2b1, a lock pin insertion / removal hole 1b32 into which the lock pin 1b33 is inserted, and a rotation pin 1b37. The first rotation type semicircular arc closing part 1b35 and the second rotation type semicircular arc closing part that locks the bucket connecting pin 2b1 by rotating via the rotation shaft 1b34. A rotating semicircular arc-shaped closing piece 1b36 and a handle 1b38 are provided. Note that the first rotating semicircular arc-shaped blocking portion 1b35 and the second rotating semicircular arc-shaped blocking portion 1b36 on the movable side hook plate 1b3 side are also the first times on the fixed side hook plate 1a3 side shown in FIG. The movable semicircular arc-shaped closing piece 1a35 and the second rotary semicircular arc-shaped closing piece 1a36 are configured in the same manner as the first rotary semicircular arc-shaped closing piece 1b35. When the bucket connecting pin 2a is sandwiched between and supported by the semicircular arc engaging portion 1b31 of the fixed jaw portion 1b, the rotary pin 1b37 and the rotary shaft in the second rotary semicircular arc closing piece 1b36 are supported. The inner surface between 1b34 contacts the outer peripheral surface of the semicircular arc engaging portion 1b31 and receives a force applied to the bucket connecting pin 2b via the semicircular arc engaging portion 1b31.

<Mounting method of bucket 2 using bucket mounting structure 1 of construction machine>
Next, the attachment method of the bucket 2 using the bucket attachment structure 1 of the construction machine of this embodiment is demonstrated.

  First, an operator drives an arm cylinder (not shown) of the construction machine to operate the operating arm 3a so that the fixed side hook plate 1a3 of the fixed jaw 1a is connected to one of the rear end portions of the bucket 2. Is engaged with the bucket connecting pin 2a. In this state, the piston 3b1 (see FIG. 1) of the bucket drive cylinder 3b is contracted, and the semicircular arc engaging portion 1a31 of the fixed side hook plate 1a3 and the semicircular arc engaging portion of the movable side hook plate 1b3. Between 1b31, it is in a state narrower than between bucket connection pins 2a and 2b of the bucket 2 rear part, as shown in FIG.

  Next, the operator drives the bucket drive cylinder 3b of the construction machine to extend the piston 3b1, and the movable jaw portion 1b is moved to the first position according to the slide guide hole 1a41 of the second fixed substrate 1a4 as shown in FIG. 2 Slide in the X direction along the fixed substrate 1a4 to move the semicircular arc engaging portion 1b31 of the movable side hook plate 1b3 in the direction of the bucket connecting pin 2b at the rear portion of the bucket 2.

  Then, as shown in FIG. 6, the semicircular arc engaging portion 1b31 of the movable hook plate 1b3 hits the bucket connecting pin 2b at the rear portion of the bucket 2, and the semicircular arc engaging portion 1a31 and the semicircular arc engaging portion 1b31 are respectively provided. When engaged with the bucket connecting pins 2a, 2b at the rear portion of the bucket 2, the operator pulls out the lockable lock pins 1a33, 1b33 from the lock pin insertion holes 1a32, 1b32 of the fixed side hook plate 1a3 and the movable side hook plate 1b3, respectively. .

  Then, as shown in FIG. 7, the operator turns the handle 1a38 of the fixed jaw 1a in the Y direction (counterclockwise in FIG. 8), while turning the handle 1b38 of the movable jaw 1b in the Y ′ direction (FIG. 8). 1st rotation type semicircular arc closure part piece 1a35, 1b35 which comprises two-stage rotation type semicircular arc closure part via rotation axis 1a34, 1b34, respectively, The two-turn semicircular arc closing part pieces 1a36, 1b36 are rotated to close the open end sides of the semicircular arc engaging part 1a31 and the semicircular arc engaging part 1b31.

  Finally, as shown in FIG. 8, the operator inserts the lock pin 1a33, 1b33 into the lock pin insertion holes 1a32, 1b32 of the fixed side hook plate 1a3 and the movable side hook plate 1b3, respectively, and rotates in two steps. The rotation of the first rotation type semicircular arc-shaped closing part pieces 1a35, 1b35 and the second rotation type semicircular arc-shaped closing part pieces 1a36, 1b36 constituting the semicircular arc-shaped closing part is locked, and the two-stage rotation The bucket connection pins 2a, 2b are supported by the first rotating semicircular arc-shaped blocking portion pieces 1a35, 1b35 and the second rotating semicircular arc-shaped blocking portion pieces 1a36, 1b36 constituting the movable semicircular arc blocking portion. Lock it.

  As described above, in the bucket mounting structure 1 of the construction machine according to the present embodiment, the movable jaw portion 1b is provided to be slidable with respect to the fixed jaw portion 1a, and the fixed jaw portion 1a is engaged with one bucket connecting pin 2a. After that, the movable jaw portion 1b is slid with respect to the fixed jaw portion 1a by the bucket drive cylinder 3b and engaged with the other bucket connecting pin 2b. The rotary semicircular arc-shaped closing piece 1a35, 1b35 and the second rotary semicircular arc-shaped closing piece 1a36, 1b36 are rotated around the rotary shafts 1a34, 1b34, respectively, and the fixed jaw 1a and the movable jaw 1a are movable. The bucket is sandwiched between the semicircular arc engaging portions 1a31, 1b31 of the jaw portion 1b and the first rotary semicircular arc closing piece 1a35, 1b35 constituting the two-stage rotary semicircular arc closing portion. Communicating Since the pins 2a and 2b are supported, a driving actuator such as a screw or a hydraulic cylinder for operating the movable jaw 1b is not required, and the cost can be reduced. The bucket connecting pin 2a is fixed from the fixed jaw 1a and the movable jaw 1b. , 2b can be reliably prevented.

  In particular, in the bucket mounting structure 1 of the construction machine according to the present embodiment, the semicircular arc contact portion 1a35a of the first rotational semicircular arc blocking portion piece 1a35 and the semicircular arc engaging portion 1a31 of the fixed jaw portion 1a. When the bucket connecting pin 2a is supported between them, as shown in FIG. 9, the inner surface 1a36a between the rotating pin 1a37 and the rotating shaft 1a34 in the second rotating semicircular arc-shaped closing part 1a36. Is in contact with the outer peripheral surface 1a31a of the semicircular arc engaging portion 1a31 and receives the force applied to the bucket connecting pin 2a via the semicircular arc engaging portion 1a31. Therefore, the force applied to the bucket connecting pins 2a, 2b is The movable semicircular arc-shaped closing piece 1a35, 1b35 and the second rotating semicircular arc-shaped closing piece 1a36, 1b36 can be received as a whole, and the bucket connecting pin 2a, from the fixed jaw 1a and the movable jaw 1b, 2b It can be more reliably prevented disengaged.

  In the description of the above embodiment, the second fixed substrate 1a4 of the fixed jaw portion 1a is provided with the slide guide hole 1a41, and the movable jaw portion 1b slides according to the slide guide hole 1a41 and engages with the bucket connecting pin 2b. However, the present invention is not limited to this, and the movable jaw portion 1b is moved in parallel with respect to the fixed jaw portion 1a by using a link mechanism, a rotation mechanism, a relationship between the seals and the rails, etc. It is sufficient if it can slide and engage with the bucket connecting pin 2b by rotational movement or the like.

  Further, in the description of the above embodiment, after the bucket 2 is attached, a two-stage rotational semicircular arc-shaped closing portion attached to the fixed jaw portion 1a and the movable jaw portion 1b via the rotation shafts 1a34 and 1b34 is configured. After the first rotating semicircular arc-shaped closing portion pieces 1a35, 1b35 and the second rotating semicircular arc-shaped closing portion pieces 1a36, 1b36 are rotated, the lockable lock pins are respectively inserted into the lock pin insertion / removal holes 1a32, 1b32. 1a33, 1b33 is inserted and the supporting state of the bucket connecting pins 2a, 2b is locked. However, the present invention is not limited to this, and as shown in FIGS. Sliding semicircular arc-shaped blocking portions 1a39, 1b3 that slide (enter / exit) along the outer periphery of the bucket coupling pins 2a, 2b of the bucket 2 respectively to the semicircular arc engaging portion 1b31. It may be provided.

  10 shows a bucket mounting structure 1 (sliding semicircular arc-shaped blocking portion 1a39, 1b39) using a sliding semicircular arc-shaped blocking portion 1a39, 1b39 or the like instead of the two-stage rotating semicircular arc-shaped blocking portion. 11 is a cross-sectional view showing a storage state of the construction machine, and FIG. 11 shows a bucket mounting structure 1 (sliding semicircular arc-shaped blocking portions 1a39, 1b39) using the sliding semicircular arc-shaped blocking portions 1a39, 1b39 and the like. , 2b after support). FIGS. 12A to 12C are cross-sectional views showing in detail the retracted state, slide state, and connecting pin 2a support state of the sliding semicircular arc-shaped closing portion 1a39.

  In this case, after the bucket connecting pins 2a and 2b are engaged with the semicircular arc engaging portion 1a31 of the fixed jaw portion 1a and the semicircular arc engaging portion 1b31 of the movable jaw portion 1b, respectively, The closing portions 1a39, 1b39 are slid (entered / exited) along the outer peripheries of the bucket connecting pins 2a, 2b to close the open ends of the semicircular arc engaging portion 1a31 and the semicircular arc engaging portion 1b31. The bucket connecting pins 2a and 2b are supported by the arc-shaped engaging portions 1a31 and 1b31 and the semi-arc-shaped engaging portions 1a31 and 1b31 so as to cover the outer peripheral surfaces thereof.

  Thereafter, the continuation of the support state of the bucket connecting pins 2a, 2b by the sliding semicircular arc-shaped blocking portions 1a39, 1b39 is, for example, the engagement of the sliding semicircular arc-shaped blocking portions 1a39, 1b39 as shown in FIGS. The sliding state of the sliding semicircular arc-shaped closing portions 1a39, 1b39 is locked by the rotation of the rotary lock pins 1a40, 1b40 having the engaging portions 1a40a, 1b40a engaged with the joint portions 1a39a, 1b39a, and the sliding semicircle You may make it lock the support state by the bucket connection pin 2a, 2b by the arc-shaped obstruction | occlusion part 1a39, 1b39.

  12A and 12C, the engaging portion 1a40a of the rotary lock pin 1a40 is engaged with the engaged portion 1a39a of the sliding semicircular arc-shaped closing portion 1a39, and the sliding semicircular arc-shaped closing is performed. While FIG. 12B shows a state where the sliding state of the portion 1a39 is locked, FIG. 12B shows that the engaging portion 1a40a of the rotary lock pin 1a40 is located in the recess 1a40b of the sliding semicircular arc-shaped closing portion 1a39. The sliding semicircular arc-shaped blocking portion 1a39 is in a slide-free state.

  Further, the locking of the sliding semicircular arc-shaped blocking portions 1a39, 1b39 in the sliding state is not limited to the rotation of the rotary lock pins 1a40, 1b40 and the like. Of course, it is also possible to use. This is the rotation of the first rotation type semicircular arc closure part pieces 1a35, 1b35 and the second rotation type semicircular arc closure part pieces 1a36, 1b36 constituting the two-stage rotation type semicircular arc closure part. The same is true for the lock of the state, and the lock is not limited to the lock by the removable lock pins 1a33, 1b33, and may be configured to be locked by other means.

  Moreover, in the said embodiment, as shown in FIGS. 1-12, the bucket attachment structure 1 of the construction machine which concerns on this invention is attached to the construction machine which the movable jaw part 1b attached to the fixed jaw part 1a so that sliding was possible. However, the present invention is not limited to this, and the present invention is not limited to this, and is naturally applicable to any structure in which the movable jaw portion 1b is attached to the bucket by moving or rotating relative to the fixed jaw portion 1a. is there. For example, as shown in FIGS. 13 and 14, the construction machine bucket mounting structure 1 according to the present invention has a movable jaw portion 1b rotatably attached to a fixed jaw portion 1a via a fulcrum pin 1c. Alternatively, as shown in FIG. 15, the movable jaw portion (not shown) intersects the fixed jaw portion in an X shape (or cross) and can be rotated via the fulcrum pin 1c at the intersection. You may make it apply to the construction machine attached to.

DESCRIPTION OF SYMBOLS 1 Bucket mounting structure of construction machine 1a Fixed jaw part 1a1 Fixed side connection plate 1a2 First fixed board 1a3 Fixed side hook board 1a31 Semi-arc-shaped engagement part 1a32 Lock pin insertion / extraction hole 1a33 Removable lock pin 1a35 First rotation type Semicircular arc-shaped closing part 1a36 Second rotational semicircular arc-shaped closing part 1a39 Sliding semicircular arc-shaped closing part 1a39a Engaged part 1a40 Rotary lock pin 1a40a Engaging part 1a40b Recessed part 1a4 Second fixed substrate 1a41 Slide Guide hole 1b Movable jaw portion 1b1 Movable side connecting portion 1b2 Slide substrate 1b3 Movable side hook plate 1b31 Semi-circular engagement portion 1b32 Lock pin insertion / removal hole 1b33 Removable lock pin 1b35 First rotational semi-arc-shaped obstruction piece 1b36 Second rotational semicircular arc-shaped closing piece 1b39 Sliding semicircular arc Closing portion 1b39a engaged portion 1b40 the pivot lock pin 1b40a engaging portion 1b40b recess 1c fulcrum pin 2 bucket 2a, 2b connecting pin 3a actuating arm 3b bucket drive cylinder 3b1 piston 3c bucket link 3d arm link

Claims (5)

A fixed jaw part attached to the tip of the working arm of a construction machine such as a power shovel on each of the two bucket connecting pins provided at a predetermined interval on the rear side of the bucket, and a piston tip that extends and contracts from the bucket drive cylinder A bucket mounting structure for a construction machine, in which a bucket is attached by engaging a movable jaw part attached to a bucket via a bucket link,
Each of the fixed jaw portion and the movable jaw portion has a semicircular arc engaging portion having a semicircular arc cross section corresponding to the outer peripheral surface of the bucket connecting pin with one end open, and a connecting pin on the semicircular arc engaging portion. after the engaged, semicircular closed portion of the cross-section semicircular supporting a bucket connecting pin between said semicircular engaging portion closes the one open end side of the semicircular engaging portion Have
The semicircular arc-shaped blocking portions of the fixed jaw portion and the movable jaw portion are respectively formed by a first rotating semicircular arc blocking portion piece and a second rotating semicircular arc blocking portion piece via a rotation pin. And is configured to be pivotable,
The first rotation type semicircular arc-shaped closing part piece of the semicircular arc-shaped closing part of the fixed jaw part and the movable jaw part is respectively configured such that the base end side is the second rotation type semicircle via a rotation pin. The arc-shaped closing piece is rotatably connected to the tip end side, and has a semi-arc-shaped contact portion corresponding to the outer peripheral surface of the bucket connecting pin on the tip side, and the semi-arc-shaped contact portion and the fixed jaw A bucket connecting pin is supported between a part or a semi-arc-shaped engaging part of the movable jaw part,
As for the 2nd rotation type semicircular arc closure part piece of the semicircular arc closure part of the fixed jaw part and the movable jaw part, the tip side is the 1st rotation type semicircular arc shape via a rotation pin, respectively. The base end side of the closing part piece is rotatably connected to the base end side, and the base end side is rotatably attached to the fixed jaw portion or the movable jaw portion via a rotation shaft, and the first rotation When the bucket connecting pin is supported between the semicircular arc contact portion of the semicircular arc closing portion and the semicircular engagement portion of the fixed jaw portion or the movable jaw portion, the second A bucket mounting structure for a construction machine, wherein an inner side surface between the rotary pin and the rotary shaft of the rotary semicircular arc-shaped closing part abuts an outer peripheral surface of the semicircular arc engaging part. The bucket mounting structure for a construction machine according to claim 1,
Furthermore, the semicircular arc contact portion of the first rotating semicircular arc-shaped closing portion and the fixed jaw portion or the movable jaw constituting the semicircular arc-shaped closing portion of each of the fixed jaw portion and the movable jaw portion. A bucket mounting structure for a construction machine, characterized in that an insertion / removal type lock pin is provided for locking a state in which the bucket connecting pin is sandwiched between and supported by a semicircular arc engaging portion of the portion . In the bucket mounting structure of the construction machine according to claim 1 or 2,
The movable jaw portion is provided so as to be slidable with respect to the fixed jaw portion. After engaging the semicircular arc engaging portion of the fixed jaw portion with one bucket connecting pin, the movable jaw portion is A bucket mounting structure for a construction machine, wherein the semi-circular engaging portion of the movable jaw is engaged with the other bucket connecting pin by sliding with respect to the fixed jaw. In the bucket mounting structure of the construction machine according to claim 1 or 2,
The movable jaw part is provided rotatably with respect to the fixed jaw part via a fulcrum pin, and after engaging the semicircular arc engaging part of the fixed jaw part with one bucket connecting pin, A construction machine characterized in that the movable jaw part is rotated with respect to the fixed jaw part along the fulcrum pin to engage the semicircular arc engaging part of the movable jaw part with the other bucket connecting pin. Bucket mounting structure.   A construction machine comprising the bucket mounting structure for a construction machine according to any one of claims 1 to 4.

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