JP2011106118A - Working apparatus for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain the tip side of an arm cylinder from colliding with a boom when conveying the boom from which an arm is removed. <P>SOLUTION: The tip side of the boom 12 includes left and right cylinder fixing plates 25, 26, and a connecting pin 21 of the other side inserted through the tip side of a rod 19B of the arm cylinder 19 is held by one of the left and right cylinder fixing plates 25, 26, e.g., by a through hole 25A of the left cylinder fixing plate 25. The tip side of the arm cylinder 19 can thereby be fixed by the left cylinder fixing plate 25, and in the case of conveying the boom 12 independently using a crane or the like, the unprepared movement (turning) of the tip side of the arm cylinder 19 relative to the boom 12 is prevented to surely prevent the damage of the arm cylinder 19 and boom 12. The service life of the arm cylinder 19, the boom 12, etc. can thereby be extended. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a working device for a construction machine that is mounted on a construction machine such as a hydraulic excavator and includes a boom, an arm, a work tool, and the like.

  In general, a hydraulic excavator as a typical example of a construction machine is a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and an uplifting motion on the front side of the upper revolving body. It is roughly constituted by a working device that can be provided. Then, the work device usually includes a boom whose base end side is rotatably connected to a revolving frame that is a base of the upper revolving structure, an arm that is rotatably connected to the distal end side of the boom, A work tool such as an excavation bucket that is rotatably connected to the distal end side, and a boom cylinder, an arm cylinder, and a work tool cylinder that operate the boom, an arm, and the work tool.

  In this case, the base end side of the arm cylinder is connected to a boom side bracket provided at an intermediate portion in the length direction of the boom using a connection pin, and the tip end side of the arm cylinder is provided on the base end side of the arm. It is connected to the arm side bracket using a connecting pin. Then, by extending and retracting the arm cylinder, the arm rotates upward and downward on the tip side of the boom.

  By the way, the hydraulic excavator as described above is usually loaded on a transport vehicle such as a trailer and transported to a work site. However, when there is a load length limitation or a load load limitation, for example, the working device is started from the vehicle body. A method is adopted in which the vehicle body and the work device are loaded on individual transport vehicles and transported to a work site (see, for example, Patent Document 1).

JP 9-41414 A

  Here, since the work device including the boom, arm, work tool, and the like is heavy, when removing the work device from the vehicle body, for example, remove the arm from the tip end side of the boom while lifting the arm using a crane or the like. Then, a method of removing the boom from the vehicle body in a state where the boom is lifted using a crane or the like is employed.

  However, when removing the work device from the vehicle body according to the above-described procedure, it is necessary to remove the tip side of the arm cylinder from the arm-side bracket in advance when removing the arm from the boom. Therefore, when the arm is removed from the boom, normally, only the base end side of the arm cylinder is connected to the boom (boom side bracket), and the tip end side of the arm cylinder is a free end.

  Therefore, when the boom removed from the vehicle body is lifted by a crane or the like and transported to a transport vehicle, or when only the boom is raised and lowered by the boom cylinder with the arm removed from the boom, it becomes a free end. The distal end side of the arm cylinder may rotate around the proximal end connected to the boom side bracket. As a result, there is a problem that the tip end side of the rotating arm cylinder collides with the boom, and the arm cylinder and the boom are damaged.

  The present invention has been made in view of the above-described problems of the prior art, and is a construction that can reliably prevent the front end side of the arm cylinder from colliding with the boom when transporting the boom with the arm removed. The object is to provide a machine working device.

  In order to solve the above-described problems, the present invention provides a boom having a base end pivotably attached to a support frame constituting a construction machine, and a boom-side bracket provided at an intermediate portion in the length direction, and a tip of the boom. An arm that is pivotably attached to the side and has an arm side bracket provided on the base end side, and a base end side is connected to the boom side bracket using one connection pin, and a tip end side is connected to the arm side bracket on the other side The present invention is applied to a working device for a construction machine including an arm cylinder that is connected using a connecting pin and rotates the arm with respect to the boom.

  A feature of the configuration employed by the invention of claim 1 resides in that a cylinder fixing member for fixing the distal end side of the arm cylinder removed from the arm side bracket is provided on the distal end side of the boom.

  According to a second aspect of the present invention, the cylinder fixing member is configured to also serve as a rope hooking tool for hooking a rope for lifting the boom.

  According to a third aspect of the present invention, the cylinder fixing member is composed of a pair of left and right cylinder fixing plates facing in the left and right directions across the tip end side of the arm cylinder. Is that a pin hole for holding the other connecting pin is provided.

  According to a fourth aspect of the present invention, the pin hole is formed by a through hole formed through the cylinder fixing plate, or by opening a part of the cylinder fixing plate into a C shape. This is because it is constituted by a C-shaped hole.

  According to the first aspect of the present invention, before the arm is removed from the boom, the tip end side of the arm cylinder can be detached from the arm side bracket and fixed to the cylinder fixing member provided on the tip end side of the boom. As a result, the base end side of the arm cylinder is connected to the boom side bracket, and the tip end side of the arm cylinder is fixed to the cylinder fixing member, so that the arm cylinder can be stably supported on the boom in a state where both arms are supported. it can.

  For this reason, for example, when the boom is transported alone using a crane or when the boom with the arm removed is rotated with respect to the support frame, the tip end side of the arm cylinder moves inadvertently with respect to the boom ( (Rotation) can be reliably prevented. As a result, it is possible to suppress the arm cylinder and the boom from being damaged due to the arm cylinder colliding with the boom, and the life of the arm cylinder and the boom can be extended.

  According to the second aspect of the present invention, for example, when the boom is lifted using a crane or the like in a state where the tip end side of the arm cylinder is not fixed, the cylinder fixing member can be used as a rope latch. As a result, the number of lifting points by the ropes increases, so that the load acting on the plurality of ropes can be dispersed, and the booms can be stably lifted by the ropes.

  According to the invention of claim 3, after removing the other connecting pin from the tip end side of the arm cylinder, the tip end side of the arm cylinder is removed from the arm side bracket, and then the other connecting pin is again connected to the tip end side of the arm cylinder. And the other connecting pin is held by the pin hole of one of the left and right cylinder fixing plates so that the tip side of the arm cylinder can be fixed by one cylinder fixing plate. it can.

  In this case, of the left and right cylinder fixing plates, the other cylinder fixing plate can be used as a lifting rope latch, so that the tip side of the arm cylinder is fixed with one cylinder fixing plate. The boom can be stably lifted using the other cylinder fixing plate.

  According to the invention of claim 4, when the pin hole of the cylinder fixing plate is constituted by a through hole, the other connecting pin is inserted into the through hole of the cylinder fixing plate and the tip side of the arm cylinder, thereby The tip side of the cylinder can be securely fixed.

  On the other hand, when the pin hole of the cylinder fixing plate is constituted by a C-shaped hole, the other connecting pin inserted into the tip side of the arm cylinder is fitted into the C-shaped hole through the opening of the C-shaped hole. By doing so, the tip end side of the arm cylinder can be quickly and easily fixed.

It is a front view which shows the hydraulic shovel provided with the working device by the 1st Embodiment of this invention. It is an enlarged front view which expands and shows the attaching part of the boom and arm in FIG. It is a front view which shows a boom alone. It is a perspective view which shows a cylinder fixing plate and the front end side of a boom. It is a disassembled perspective view which shows the state which penetrates the connection pin of an arm cylinder to a cylinder fixing plate. It is a perspective view which shows the state which fixed the front end side of the arm cylinder to the cylinder fixing plate. It is a front view which shows the boom which fixed the arm cylinder independently. It is a front view which shows the state which lifted the boom single-piece | unit which fixed the arm cylinder with the rope. It is an enlarged front view similar to FIG. 2 which shows the attachment part of the boom and arm of the working device by 2nd Embodiment. It is a disassembled perspective view which shows the state which penetrates the connection pin of an arm cylinder to a cylinder fixing plate. It is a perspective view which shows the state which fixed the front end side of the arm cylinder to the cylinder fixing plate. It is a perspective view which shows the cylinder fixing plate of the working device by 3rd Embodiment, and the front end side of a boom. It is a disassembled perspective view which shows the state which fits the connecting pin of an arm cylinder to the cylinder fixing plate of a working device. It is a perspective view which shows the state which fixed the front end side of the arm cylinder to the cylinder fixing plate. It is a perspective view which shows the state which fixed the front end side of the arm cylinder to the cylinder fixing plate using the connection pin by a modification.

  Hereinafter, a case where an embodiment of a working device for a construction machine according to the present invention is applied to a hydraulic excavator will be described as an example and described in detail with reference to the accompanying drawings.

  1 to 8 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a hydraulic excavator as a typical example of a construction machine. The hydraulic excavator 1 is a self-propelled crawler type lower traveling body 2 and is mounted on the lower traveling body 2 so as to be able to turn. 2 is composed of an upper swing body 3 that constitutes a vehicle body together with a work device 11 (described later) provided on the front side of the upper swing body 3 so as to be able to move up and down.

  When the hydraulic excavator 1 is transported to the work site, the work apparatus 11 is normally detached from the upper swing body 3 by individually removing the work apparatus 11 from the upper swing body 3 and the work apparatus 11. The vehicle is loaded on a transport vehicle, and the vehicle body and the work device 11 are separately transported to the work site.

  Here, the upper swing body 3 includes a swing frame 4 as a support frame that is pivotably mounted on the lower traveling body 2, and a cab 5 that is provided on the left side of the front portion of the swing frame 4 and defines a driver's cab. The counter weight 6 provided on the rear end side of the revolving frame 4 and the building cover 7 provided on the front side of the counter weight 6 and accommodating an engine, a hydraulic pump and the like (both not shown) are roughly constituted. . The revolving frame 4 has a base plate (not shown) serving as a base and left and right vertical plates standing on the base plate, and the front end side of each vertical plate has a work device 11 described later. The work device bracket 4A is supported.

  Next, a working device provided in the excavator 1 for performing excavation work of earth and sand will be described.

  Reference numeral 11 denotes a work device that is supported by the work device bracket 4A of the revolving frame 4 constituting the upper revolving structure 3 so as to be able to move up and down. The work device 11 includes a boom 12, an arm 13, a bucket 15, and a boom cylinder 18 described later. , Arm cylinder 19, bucket cylinder 24, and the like.

  Reference numeral 12 denotes a boom that constitutes the work device 11, and the boom 12 is bent in a “h” shape and extends in the front and rear directions, as shown in FIG. A lower flange 12B that extends in the front and rear directions while facing the upper flange 12A in the upper and lower directions and constitutes a lower surface of the boom 12, and an upper flange 12A and a lower flange 12B that face in the left and right directions A box structure body having a quadrangular cross section is formed by the left and right webs 12 </ b> C that are disposed between the left and right webs 12 </ b> C and that form the left and right sides of the boom 12.

  Here, on the base end side of the boom 12, a cylindrical base end side boss 12D extending in the left and right directions is fixedly provided, and the base end side boss 12D is used for the work of the revolving frame 4 shown in FIG. It is configured to be pin-coupled to the device bracket 4A so as to be rotatable upward and downward.

  On the other hand, the end of the boom 12 is bent into a V shape and protrudes forward from the end of the upper and lower flanges 12A and 12B and from the end of the left and right webs 12C. The left and right end brackets 12F facing each other in the left and right directions with the end plate 12E interposed therebetween are provided. A boom mounting boss 13A of an arm 13, which will be described later, is rotatably connected to each end bracket 12F. Further, left and right cylinder fixing plates 25 and 26, which will be described later, are erected on the upper surface side of the end plate 12E (see FIG. 2).

  A cylindrical intermediate boss 12G is fixedly provided at an intermediate portion in the length direction of the boom 12 so as to penetrate the left and right webs 12C, and a boom cylinder 18 described later is provided on the intermediate boss 12G. The rod 18B tip is configured to be pin-coupled. Further, left and right boom side brackets 12H, which are formed of triangular plates and face in the left and right directions, are erected at an intermediate portion in the length direction of the upper flange 12A constituting the boom 12, The side bracket 12H is configured such that a bottom side of a tube 19A of an arm cylinder 19 to be described later is pin-coupled so as to be rotatable.

  Reference numeral 13 denotes an arm rotatably attached to the distal end side of the boom 12, and the arm 13 is also formed as a box structure having a quadrangular cross section like the boom 12. A cylindrical boom mounting boss 13A is provided at an intermediate portion in the length direction of the arm 13, and the boom mounting boss 13A can be rotated by using pins 14 on the left and right end brackets 12F of the boom 12. Installed on. Further, a bucket 15 described later is rotatably attached to the distal end side of the arm 13.

  On the other hand, on the base end side of the arm 13, left and right arm side brackets 13B made of a triangular plate are projected rearward, and the arm side bracket 13B is provided with an arm cylinder 19 to be described later. The tip of the rod 19B is configured to be pin-coupled so as to be rotatable. Further, on the upper surface side of the arm 13, left and right bucket cylinder brackets 13C made of a triangular plate body are erected. The bucket cylinder bracket 13C has a tube 24A of a bucket cylinder 24 to be described later. The bottom side is configured to be pin-coupled so as to be rotatable.

  Reference numeral 15 denotes a bucket as a working tool rotatably attached to the distal end side of the arm 13, and the bucket 15 is rotatably attached to the distal end portion of the arm 13 using a pin 16. Further, between the arm 13 and the bucket 15, a bucket link 17 to which a bucket cylinder 24 described later is connected is provided. The bucket 15 is rotated upward and downward by the bucket cylinder 24 on the distal end side of the arm 13 to perform soil excavation work and the like.

  Reference numeral 18 denotes a boom cylinder provided between the revolving frame 4 and the boom 12, and the boom cylinder 18 is arranged on the left and right with the boom 12 in between. In the boom cylinder 18, the bottom side of the tube 18 </ b> A is pin-coupled to the work device bracket 4 </ b> A of the revolving frame 4, and the tip end side of the rod 18 </ b> B is pin-coupled to the intermediate boss 12 </ b> G of the boom 12. 12 is turned up and down (up and down).

  Reference numeral 19 denotes an arm cylinder provided between the boom 12 and the arm 13, and the arm cylinder 19 rotates the arm 13 upward and downward on the distal end side of the boom 12. Here, the arm cylinder 19 includes a tube 19A, a piston (not shown) slidably provided in the tube 19A, a rod 19B attached to the piston on the base end side and protruding from the tube 19A on the distal end side. It is comprised by.

  The bottom side of the tube 19 </ b> A, which is the base end side of the arm cylinder 19, is pivotally attached to the boom side bracket 12 </ b> H of the boom 12 using one connecting pin 20, and becomes the front end side of the arm cylinder 19. The distal end side of the rod 19B is rotatably attached to the arm side bracket 13B of the arm 13 using the other connecting pin 21.

  Here, as shown in FIG. 2, the other connecting pin 21 is detachably inserted into the arm side bracket 13B of the arm 13 and the rod 19B of the arm cylinder 19 so as to be rotatable. . Then, a flat plate retaining plate 22 extending in a direction orthogonal to the axial direction of the other connecting pin 21 is fixed to one end side in the axial direction of the other connecting pin 21 by means such as welding. Yes. Then, by fixing the distal end side of the retaining plate 22 to the arm side bracket 13B using the bolt 23, the other connecting pin 21 can be retained and stopped in the axial direction. . Further, a bolt insertion hole 22A is provided at an intermediate portion in the length direction of the retaining plate 22, and a fixing bolt 27 described later is inserted into the bolt insertion hole 22A.

  Reference numeral 24 denotes a bucket cylinder provided between the arm 13 and the bucket 15. The bucket cylinder 24 has a bottom side of the tube 24A pin-coupled to a bucket cylinder bracket 13C of the arm 13, and a tip side of the rod 24B is a bucket cylinder. Pin-coupled to the link 17. The bucket cylinder 24 rotates the bucket 15 upward and downward on the distal end side of the arm 13.

  Next, 25 and 26 indicate left and right cylinder fixing plates provided on the tip side of the boom 12, and the left cylinder fixing plate 25 and the right cylinder fixing plate 26 are fixed to the cylinder according to the present embodiment. It constitutes a member.

  Here, as shown in FIGS. 4 to 6, the left and right cylinder fixing plates 25, 26 are formed in a substantially triangular flat plate shape using, for example, a steel plate material, and the end plates 12 </ b> E constituting the boom 12. By being fixed to the upper surface by means of welding or the like, it protrudes upward from the upper surface of the boom 12 and faces in the left and right directions across the tip side of the arm cylinder 19.

  In this case, on the protruding end side of the left cylinder fixing plate 25, a through hole 25A is formed as a pin hole penetrating the cylinder fixing plate 25 leftward and rightward (plate thickness direction). By inserting the other connecting pin 21, the other connecting pin 21 can be held. Further, a female screw hole 25B is screwed in the vicinity of the through hole 25A in the left cylinder fixing plate 25, and this female screw hole 25B is formed on the retaining plate 22 with the other connecting pin 21 inserted through the through hole 25A. It is arranged at a position corresponding to the bolt insertion hole 22A.

  For example, as shown in FIGS. 5 and 6, the through-hole of the left cylinder fixing plate 25 in a state where the tip end side of the rod 19 </ b> B of the arm cylinder 19 is disposed between the left and right cylinder fixing plates 25 and 26. The other connecting pin 21 is inserted into the rod end side of 25A and the arm cylinder 19, and the fixing bolt 27 inserted into the bolt insertion hole 22A of the retaining plate 22 is screwed into the female screw hole 25B of the left cylinder fixing plate 25. Thus, the tip end side of the rod 19B of the arm cylinder 19 can be fixed to the left cylinder fixing plate 25.

  On the other hand, the right cylinder fixing plate 26 is formed in the same shape as the left cylinder fixing plate 25, and has a through hole 26A as a pin hole and a female screw hole 26B. Therefore, the other connecting pin 21 is inserted into the through hole 26A of the right cylinder fixing plate 26 and the rod tip side of the arm cylinder 19, and the fixing bolt 27 inserted into the bolt insertion hole 22A of the retaining plate 22 is inserted into the right cylinder. By screwing into the female screw hole 26B of the fixing plate 26, the tip end side of the rod 19B of the arm cylinder 19 can be fixed to the right cylinder fixing plate 26.

  Here, as shown in FIG. 6, when the tip end side of the rod 19B of the arm cylinder 19 is fixed to, for example, the left cylinder fixing plate 25 of the left and right cylinder fixing plates 25, 26, the remaining right cylinder The fixing plate 26 can be used as a hook for a wire rope 28 indicated by a two-dot chain line in FIG.

  That is, for example, when the boom 13 is lifted using a crane or the like after the arm 13 is removed from the boom 12 during transportation of the hydraulic excavator 1, the tip side of the rod 19B of the arm cylinder 19 is moved to the left cylinder as shown in FIG. After fixing to the fixing plate 25, as shown in FIG. 8, a wire rope 28 is hung on the proximal end boss 12D, the distal end bracket 12F, the intermediate boss 12G of the boom 12 and the through hole 26A of the right cylinder fixing plate 26. The wire rope 28 is hung on a hook 29 of a hydraulic crane. Thus, the boom 12 can be stably lifted in a state where the wire rope 28 is hooked at four locations on the boom 12.

  The working device 11 of the hydraulic excavator 1 according to the present embodiment has the above-described configuration. The working device 11 is removed from the vehicle body (upper swing body 3) of the hydraulic excavator 1, for example, a trailer or the like. It is loaded onto a transport vehicle and transported to the work site. Then, the excavator 1 is assembled by attaching the working device 11 to the upper swing body 3 and assembling the excavator 1 at the work site.

  Here, the working device 11 according to the present embodiment is provided with the left and right cylinder fixing plates 25 and 26 on the distal end side of the boom 12, so that the working device 11 is attached to and detached from the upper swing body 3. Furthermore, the workability when lifting the boom 12 using a crane or the like can be improved. Hereinafter, the work of lifting the boom 12 will be described.

  When removing the working device 11 from the upper swing body 3 of the excavator 1, first, the other connecting pin 21 that connects the arm side bracket 13B of the arm 13 and the tip end side of the rod 19B of the arm cylinder 19 is removed, and the arm The tip end side of the rod 19B of the arm cylinder 19 is removed from the arm-side bracket 13B. Next, the arm 13 is removed from the boom 12 by removing the pin 14 that connects the end bracket 12F of the boom 12 and the boom mounting boss 13A of the arm 13.

  As shown in FIGS. 5 and 6, the through hole 25 </ b> A of the left cylinder fixing plate 25 in a state where the distal end side of the rod 19 </ b> B of the arm cylinder 19 is disposed between the left and right cylinder fixing plates 25 and 26. The other connecting pin 21 is inserted through the rod end side of the arm cylinder 19. Further, the fixing bolt 27 inserted through the bolt insertion hole 22A of the retaining plate 22 is screwed into the female screw hole 25B of the left cylinder fixing plate 25.

  Thereby, the arm cylinder 19 is connected to the boom side bracket 12H of the boom 12 using the one connecting pin 20 on the bottom side of the tube 19A, and the cylinder fixing plate on the left side using the other connecting pin 21 on the tip side of the rod 19B. Therefore, the arm cylinder 19 can be securely fixed to the upper surface side of the boom 12 in a state where both arms are supported (see FIG. 7).

  Therefore, even when the boom 13 is moved up and down with the boom cylinder 18 extended and contracted, for example, with the arm 13 removed from the boom 12, as described above, the arm cylinder 19 is connected to the boom side bracket 12H ( It is possible to reliably prevent the arm cylinder 19 from colliding with the boom 12 and being damaged without inadvertent rotation about the one connecting pin 20).

  Next, when the boom 12 is removed from the revolving frame 4 of the upper revolving structure 3 and transported to a transporting vehicle or the like using a crane or the like, as shown in FIG. 12F and the intermediate boss 12G are hooked on the wire rope 28 and, as shown in FIG. 6, the right cylinder fixing plate 26 that is not involved in fixing the arm cylinder 19 among the left and right cylinder fixing plates 25 and 26. The wire rope 28 is hooked on the through hole 26A.

  As a result, the wire rope 28 can be hooked at four locations including the base end side boss 12D, the front end bracket 12F and the intermediate boss 12G of the boom 12 and the right cylinder fixing plate 26, and the wire rope 28 can be connected to the crane. The boom 12 can be stably lifted by hanging it over the hook 29 such as the like.

  Even during the lifting operation of the boom 12, the distal end side of the rod 19 </ b> B of the arm cylinder 19 is fixed to the left cylinder fixing plate 25 via the other connecting pin 21, so Inadvertent movement of the cylinder 19 can be reliably prevented. As a result, the arm cylinder 19 can be reliably prevented from colliding with the boom 12 and the like when the boom 12 is lifted and conveyed, and the life of the arm cylinder 19 and the boom 12 can be extended. Moreover, the safety | security and workability | operativity when lifting and conveying the boom 12 can be improved.

  Thus, according to the present embodiment, since the left and right cylinder fixing plates 25 and 26 are provided on the distal end side of the boom 12, the other connecting pin 21 is removed from the distal end side of the rod 19B of the arm cylinder 19. By removing the rod 19B of the arm cylinder 19 from the arm side bracket 13B of the arm 13, the other connecting pin 21 is again inserted into the distal end side of the rod 19B of the arm cylinder 19, and the other connecting pin 21 is The front end of the arm cylinder 19 is fixed by the left cylinder fixing plate 25 by holding it through one of the left and right cylinder fixing plates 25 and 26, for example, the through hole 25A of the left cylinder fixing plate 25. be able to.

  Accordingly, for example, when the boom 12 is transported alone using a crane or the like, or when the boom 12 with the arm 13 removed is rotated with respect to the revolving frame 4, the distal end side of the arm cylinder 19 is relative to the boom 12. Inadvertently moving (turning) and reliably preventing the arm cylinder 19 from colliding with the boom 12 and the like and damaging the arm cylinder 19 and the boom 12. The life of the boom 12 and the like can be extended.

  Of the left and right cylinder fixing plates 25 and 26, the right cylinder fixing plate 26 that is not involved in fixing the tip side of the arm cylinder 19 is used as a rope latch for hooking the wire rope 28. be able to. As a result, as shown in FIG. 8, the wire rope 28 can be hooked at four locations on the base end side boss 12D, the front end bracket 12F, the intermediate boss 12G, and the right cylinder fixing plate 26 of the boom 12. As a result, the load acting on each wire rope 28 can be dispersed and the boom 12 can be stably lifted, so that safety and workability when the boom 12 is lifted and transported can be improved. .

  Next, FIGS. 9 to 11 show a second embodiment of the present invention. In this embodiment, the tip end side of the arm cylinder 19 is connected to the other connecting pin provided with a retaining bolt. The case where it fixes to a cylinder fixing plate is illustrated. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, 31 indicates the other connecting pin that rotatably connects the arm side bracket 13B of the arm 13 and the tip end side of the rod 19B of the arm cylinder 19, and the other connecting pin 31 is a first connecting pin 31. It replaces with the other connection pin 21 by embodiment, and is used for this Embodiment.

  Here, as shown in FIG. 9, the other connecting pin 31 is detachably inserted between the arm side bracket 13B of the arm 13 and the tip end side of the rod 19B of the arm cylinder 19, and is connected rotatably between the two. is doing. A retaining bolt 32 is attached to one axial end of the other connecting pin 31 so as to penetrate the other connecting pin 31 in the radial direction.

  A short cylindrical stop ring 33 into which one end side of the other connecting pin 31 is inserted is fixed to the outer surface of the arm side bracket 13B by welding or the like, and one end of the stop ring 33 and the other connecting pin 31 is fixed. A retaining bolt 32 is inserted in the radial direction with respect to the side, and two nuts 34 are screwed onto the retaining bolt 32 protruding from the stop ring 33, so that the other connecting pin 31 is retained in the axial direction. In addition, it is configured to be able to stop rotation.

  The working device according to the present embodiment has the other connecting pin 31 as described above. Hereinafter, the rod 19B of the arm cylinder 19 connected to the arm side bracket 13B using the other connecting pin 31 is connected to the arm side. The case where it fixes to the front end side of the boom 12 after removing from the bracket 13B is demonstrated.

  First, after the other connecting pin 31 is removed from the arm side bracket 13B and the rod 19B of the arm cylinder 19, the other connecting pin 31 is removed from the other connecting pin 31, as shown in FIG. The connecting pin 31 is inserted into the through hole 26A of the right cylinder fixing plate 26 and the distal end side of the rod 19B of the arm cylinder 19.

  Then, as shown in FIG. 11, a retaining bolt 32 is inserted into one end side of the other connecting pin 31 protruding from the distal end side of the rod 19 </ b> B, and a nut 34 is screwed to the retaining bolt 32. Thereby, the tip end side of the rod 19 </ b> B of the arm cylinder 19 can be fixed to the right cylinder fixing plate 26 using the other connecting pin 31. As a result, when the boom 12 is lifted and transported using a crane or the like, the arm cylinder 19 can be reliably prevented from inadvertently moving with respect to the boom 12, and when the boom 12 is lifted and transported. Safety and workability can be improved.

  Next, FIGS. 12 to 14 show a third embodiment of the present invention. The feature of this embodiment is that the pin hole of the cylinder fixing plate is constituted by a C-shaped hole. In the present embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, reference numerals 41 and 42 denote left and right cylinder fixing plates as cylinder fixing members provided on the distal end side of the boom 12, and these left and right cylinder fixing plates 41 and 42 are the first embodiment. The left and right cylinder fixing plates 25 and 26 are used in this embodiment instead of the left and right cylinder fixing plates 25 and 26.

  Here, the left and right cylinder fixing plates 41 and 42 are formed in a substantially triangular flat plate shape using, for example, a steel plate material, and are fixed to the upper surface of the end plate 12E constituting the boom 12 using a means such as welding. By doing so, it protrudes upward from the upper surface of the boom 12 and faces left and right with the tip side of the arm cylinder 19 in between.

  In this case, a C-shaped hole 41A as a pin hole is formed on the protruding end side of the left cylinder fixing plate 41 by opening its front side and notching it in a C-shape. This C-shaped hole The front end portion of 41A is provided with a protruding portion 41B that protrudes upward. Then, the other connecting pin 21 can be held by fitting the other connecting pin 21 into the C-shaped hole 41A from the radial direction. Further, a female screw hole 41C is screwed in the vicinity of the C-shaped hole 41A in the left cylinder fixing plate 41, and this female screw hole 41C is in a state in which the other connecting pin 21 is fitted in the C-shaped hole 41A. Are arranged at positions corresponding to the bolt insertion holes 22 </ b> A of the retaining plate 22.

  Then, for example, as shown in FIGS. 13 and 14, the rod 19 </ b> B of the arm cylinder 19 is inserted between the left and right cylinder fixing plates 41 and 42 and inserted into the rod tip of the arm cylinder 19. The other connecting pin 21 is fitted into the C-shaped hole 41A of the left cylinder fixing plate 41 from the radial direction. As a result, the other connecting pin 21 is prevented from being removed by the protrusion 41B provided at the front end of the C-shaped hole 41A and is held by the left cylinder fixing plate 41. In this state, by fixing the fixing bolt 27 inserted into the bolt insertion hole 22A of the retaining plate 22 into the female screw hole 41C of the left cylinder fixing plate 41, the tip end side of the rod 19B of the arm cylinder 19 is connected to the left cylinder. The fixing plate 41 can be securely fixed.

  On the other hand, the right cylinder fixing plate 42 is formed in the same shape as the left cylinder fixing plate 41, and has a C-shaped hole 42A as a pin hole, a protrusion 42B, and a female screw hole 42C. Therefore, the other connecting pin 21 inserted into the rod tip side of the arm cylinder 19 is fitted in the C-shaped hole 42A of the right cylinder fixing plate 42 from the radial direction, and inserted into the bolt insertion hole 22A of the retaining plate 22. By screwing the fixing bolt 27 into the female screw hole 42C of the right cylinder fixing plate 42, the tip end side of the rod 19B of the arm cylinder 19 can be fixed to the right cylinder fixing plate 42.

  Here, when the distal end side of the rod 19B of the arm cylinder 19 is fixed to, for example, the left cylinder fixing plate 41 of the left and right cylinder fixing plates 41 and 42, as shown by a two-dot chain line in FIG. By hooking the wire rope 28 to the female screw hole 42 </ b> C of the remaining right cylinder fixing plate 42, the right cylinder fixing plate 42 can be used as a hook for the wire rope 28. .

  The working device according to the present embodiment includes the left and right cylinder fixing plates 41 and 42 as described above. The rod 19B of the arm cylinder 19 removed from the arm side bracket 13B of the arm 13 is connected to the left and right cylinders. About the basic effect | action which fixes using one of the fixing plates 41 and 42, there is no exceptional difference from what is based on 1st Embodiment mentioned above.

  However, according to the present embodiment, the other connecting pin 21 inserted through the rod tip side of the arm cylinder 19 is connected to the C-shaped hole 41A of the left cylinder fixing plate 41 or the C shape of the right cylinder fixing plate 42. The hole 42A can be fitted from the radial direction. As a result, according to the present embodiment, there is no need to perform the operation of inserting / removing the other connecting pin 21 with respect to the distal end side of the rod 19B of the arm cylinder 19, and the other connecting pin 21 is connected to the distal end side of the rod 19B. When the rod end side of the arm cylinder 19 is fixed using one of the left and right cylinder fixing plates 41 and 42, it can be fixed to the left cylinder fixing plate 41 or the right cylinder fixing plate 42. The workability can be further improved.

  In the third embodiment described above, the distal end side of the rod 19B of the arm cylinder 19 is moved to the left and right using the other connecting pin 21 having the retaining plate 22 fixed to one end side in the axial direction. The case where it fixes to one cylinder fixing plate among the cylinder fixing plates 41 and 42 is illustrated.

  However, the present invention is not limited to this. For example, the other connecting pin 51 as shown in FIG. 15 is used to connect the distal end side of the rod 19B of the arm cylinder 19 to the left and right cylinder fixing plates 41 and 42. It is good also as a structure fixed to one cylinder fixing plate.

  That is, when the other connecting pin 51 having the retaining bolt 52 detachably attached to one end side in the axial direction is used, the other connecting pin 51 is inserted into the distal end side of the rod 19B of the arm cylinder 19, With the retaining bolt 52 attached, for example, the other connecting pin 51 is fitted in the C-shaped hole 42A of the right cylinder fixing plate 42 from the radial direction. As a result, the other connecting pin 51 is fitted into the C-shaped hole 42 </ b> A in a state of being secured by the protrusion 42 </ b> B of the right cylinder fixing plate 42. The distal end side of the rod 19B can be fixed to the right cylinder fixing plate 42.

  In this case, as shown by a two-dot chain line in FIG. 15, the wire rope 28 is hooked in the female screw holes 41C and 42C provided in the left and right cylinder fixing plates 41 and 42, respectively. The right cylinder fixing plates 41 and 42 can be used as a hook for the wire rope 28.

  Further, in the first embodiment described above, the case where the other connecting pin 21 is fixed using one of the left and right cylinder fixing plates 25 and 26 is illustrated. However, the present invention is not limited to this. For example, the other connecting pin 21 may be fixed using both the left and right cylinder fixing plates 25 and 26. The same applies to the second and third embodiments.

  Moreover, in 1st Embodiment mentioned above, the case where the two cylinder fixing plates 25 and 26 which face in the left and right direction are provided in the front end side of the boom 12 is illustrated. However, the present invention is not limited to this. For example, a single cylinder fixing plate may be provided. The same applies to the second and third embodiments.

  Further, in each of the above-described embodiments, the bottom side of the tube 19A of the arm cylinder 19 is attached to the boom side bracket 12H of the boom 12 using one connecting pin 20, and the distal end side of the rod 19B is connected to the other connecting pin. The case where it attached to the arm side bracket 13B of the arm 13 using 21 is illustrated. However, the present invention is not limited to this, and the tip end side of the rod 19B is attached to the boom side bracket 12H using one connecting pin 20, and the bottom side of the tube 19A is attached to the arm side bracket 13B using the other connecting pin 21. It is good also as a structure to attach.

  Furthermore, in each embodiment mentioned above, although the working apparatus 11 mounted in the hydraulic excavator 1 provided with the crawler type lower traveling body 2 was given as an example, the present invention is not limited to this, for example, the sand on the seabed. The present invention can be widely applied to work devices mounted on other construction machines such as dredgers to be excavated.

1 Excavator (construction machine)
4 Rotating frame (support frame)
DESCRIPTION OF SYMBOLS 11 Working apparatus 12 Boom 12H Boom side bracket 13 Arm 13B Arm side bracket 19 Arm cylinder 20 One connection pin 21, 31, 51 The other connection pin 25, 41 Left cylinder fixing plate (cylinder fixing member)
25A, 26A Through hole (pin hole)
26, 42 Right cylinder fixing plate (cylinder fixing member)
28 Wire rope (rope)
41A, 42A C-shaped hole (pin hole)

Claims (4)

A boom in which a base end side is rotatably attached to a support frame constituting a construction machine and a boom side bracket is provided at an intermediate portion in a length direction, and a base end side which is rotatably attached to the distal end side of the boom An arm provided with an arm side bracket and a base end side connected to the boom side bracket using one connecting pin, and a distal end side connected to the arm side bracket using the other connecting pin. A working machine of a construction machine comprising an arm cylinder for rotating the arm
A working apparatus for a construction machine, characterized in that a cylinder fixing member for fixing a tip end side of the arm cylinder removed from the arm side bracket is provided on a tip end side of the boom.   The working device for a construction machine according to claim 1, wherein the cylinder fixing member also serves as a rope hooking tool for hooking a rope for lifting the boom. The cylinder fixing member is composed of a pair of left and right cylinder fixing plates facing in the left and right directions across the tip side of the arm cylinder,
The working device for a construction machine according to claim 1 or 2, wherein the left and right cylinder fixing plates are provided with pin holes for holding the other connecting pin.   The pin hole is constituted by a through hole formed through the cylinder fixing plate or a C-shaped hole formed by opening a part of the cylinder fixing plate into a C shape. The construction machine working device according to claim 3.

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