JP2010106536A - Construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a construction machine which can contribute to cost reduction and reduction in the number of man-hours in manufacturing by enabling reduction in members for lifting the construction machine, can easily secure strength, and has a lifting means dispensing with the attachment/detachment of a lifting member. <P>SOLUTION: An upper turning structure 3 is installed on a lower travelling structure 1 via a swing device 3. A working attachment 6 which has a first boom 8 and a second boom 11 connected to the first boom so as to be turnable is attached to the upper turning structure 3. The second boom 11 comprises a pair of right and left outside plates 22, and a pair of right and left inside plates 24 which are integrally provided between the outside plates 22. One end of a hydraulic cylinder 12 for turning the second boom 11 is connected to the inside plate 24 by means of a pin 20. In an upper portion of the inside plate 24, an upward protruding portion 24a is formed as a part of the upper portion of the inside plate, and a hole 24b for hooking the lifting member 34 is formed at the protruding portion 24a. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a construction machine such as a hydraulic excavator or an application machine thereof, and more particularly to a boom structure having a lifting means suitable for lifting using a wire rope or the like.

  Conventionally, when a construction machine such as a hydraulic excavator is carried in and out of a building floor, the bottom of an underground hole or a basement, the construction machine is suspended by a crane via a wire rope. When a construction machine is suspended by this wire rope, a front rope and a rear rope are used as the wire rope. The front rope is hung on the lower surface of the boom through protective wood, and the rear rope is hung on a hanging ring or the like provided at the rear of the upper swing body.

  However, when the construction machine is suspended by this method, the front rope hung around the bottom surface of the boom may slip, the boom may be damaged, or the balance in the suspended state may be lost. In order to solve this problem, in Patent Document 1, a bracket having a pin hole is welded to a lower surface portion of a boom as a lifting device provided in a construction machine for connection to a wire rope suspended from a crane, There has been proposed a structure in which a lifting pin is inserted into the pin hole, a suspension ring is fitted to both ends of the pin, and a wire rope is hung on a hole provided in the upper part of the suspension ring.

  Patent Document 2 discloses, as a lifting device attached to a construction machine, two leg frames that are detachably fixed to a swing frame of an upper swing body, an upper frame that connects the upper portions of these leg frames, A structure constituted by two suspension parts fixed to the upper frame has been proposed. Patent Document 3 proposes a lifting device attached to a construction machine, in which suspension brackets having lifting holes are provided on the outer peripheral portions of the left and right ends of the boss of the boom base of the work attachment. Has been.

JP-A-6-257179 JP-A-10-292430 JP 2000-45333 A

  In the lifting device described in Patent Document 1, a lifting member such as a bracket that is welded to the left and right of the boom, a lifting pin that is inserted into the hole of the bracket, and a lifting ring that is fitted to the lifting pin is required. . For this reason, there are problems that the number of parts increases, man-hours for installation are required, and cost increases. In addition, since it is necessary to weld a bracket made of a member separate from the boom to the lower surface of the boom, and to provide a pin to be inserted into the pin hole of the bracket and a hanging ring to be fitted to this pin, it is difficult to guarantee strength. is there. Also, if the pins are removed in order to prevent noise generation due to the vibration of the lifting pins during normal work, it is said that it is troublesome to attach and detach and manage the pins and hanging rings accompanying the loading and unloading work of the construction machine. There are also problems.

  Similarly, in the lifting device described in Patent Document 2, the number of parts and mounting man-hours are increased by adding leg frames, upper frames, etc., resulting in high costs and difficulty in guaranteeing strength, for carrying in and out construction machinery. There is a problem that it is troublesome to attach and detach and manage the lifting member. Similarly, the lifting device described in Patent Document 3 also has the problems that the number of parts and the number of mounting man-hours due to the hanging metal fittings and the members for mounting the same are increased, and the associated high cost and strength are difficult to guarantee. .

  In view of the above-mentioned problems, the present invention can reduce the number of members for lifting a construction machine, thereby contributing to cost reduction and man-hour reduction in manufacturing, and is easy to guarantee strength. It is another object of the present invention to provide a construction machine having lifting means that is unnecessary.

The construction machine according to claim 1, wherein the upper swing body is installed on the lower traveling body via the swing device,
A work attachment is attached to the upper swing body,
In the construction machine, the working attachment includes a first boom that is attached to the upper swing body so as to be raised and lowered, and a second boom that is rotatably connected to the first boom.
The second boom has a pair of left and right outer plates and a pair of left and right inner plates provided integrally between these outer plates and having a boss connecting one end of a second boom rotating hydraulic cylinder,
Forming a protruding portion protruding upward as a part of the inner plate,
The protrusion is provided with a hole for hanging a lifting member.

The construction machine according to claim 2 is the construction machine according to claim 1,
The position of the hole for hanging the lifting member in the state in which the second boom is most closed with respect to the first boom, the pin that pivotally attaches the first boom to the upper swing body, and the first boom The second boom is set on an extension line connecting a pin pivotally attached to the second boom.

  According to the first aspect of the present invention, since a part of the inner plate for connecting the hydraulic cylinder of the second boom protrudes upward and the hole for hanging the lifting member is provided on the protruding portion, A device for lifting can be realized simply by changing the cutout or punching shape of the inner plate. For this reason, the addition of the member for lifting a construction machine becomes unnecessary, and it can contribute to the cost reduction and man-hour reduction in manufacture. In addition, since a part of the inner plate provided in the boom is originally used as a lifting member and no additional member is required, welding is not necessary, and strength assurance is easy. Furthermore, it is not necessary to attach or detach a member for lifting, the labor required for setup before and after the lifting work is simplified, and management of the lifting member is also unnecessary.

  According to the invention of claim 2, in the state where the second boom is most closed with respect to the first boom, the position of the hole into which the lifting member is inserted is extended to connect the pivoting pins at both ends of the first boom. Since the second boom is closed with respect to the first boom, and the first boom is made vertical and compact and the construction machine is lifted, no force is generated to rotate the second boom by the lifting force. . For this reason, when lifting, the second boom can always be lifted in a stable posture without rotating with respect to the first boom.

  FIG. 1 is a side view showing an embodiment of a construction machine according to the present invention. 1 is a crawler type lower traveling body, and 3 is an upper revolving body installed on the lower traveling body 1 via a revolving device 2. An cab 4 and a hydraulic power unit 5 are mounted on the upper swing body 3. A work attachment 6 is attached to the upper swing body 3.

  The work attachment 6 is provided between the upper swing body 3 and the first boom 8 in order to raise and lower the first boom 8 and the first boom 8 attached to the upper swing body 3 by pins 7 so as to be raised and lowered. A hydraulic cylinder 9; a second boom 11 pivotally connected to the tip of the first boom 8 and a pin 10; and a first boom 8 and a second boom 11 for rotating the second boom 11; A hydraulic cylinder 12 provided between the arm 14, an arm 14 pivotally connected to the tip of the second boom 11 around a pin 13, and a second boom 11 and an arm 14 for rotating the arm 14. A hydraulic cylinder 15 provided therebetween, a work tool 17 attached to the tip of the arm 14 so as to be rotatable about a pin 16, and between the arm 14 and the work tool 17 for rotating the work tool 17. The provided hydraulic cylinder 18 and And a link mechanism 19. Reference numerals 20 and 21 denote pins for connecting one end of the hydraulic cylinders 12 and 15 to the second boom 11, respectively.

  2 is a side view of the second boom 11, FIG. 3 is a plan view thereof, FIG. 4 is a bottom view thereof, and FIG. 5 is a sectional view taken along line EE of FIG. The second boom 11 includes a pair of left and right outer plates 22, 22, a connecting member 23 welded between the outer plates 22, 22, and a left and right welded to the connecting member 23 between the outer plates 22, 22. A pair of inner plates 24, 24 are provided. One end of the outer plate 22 and the inner plate 24 has a pin hole 26 and a boss 27 into which the pin 10 for connecting the first boom 8 and the second boom 11 is inserted. In addition, the other end of the outer plate 22 has a pin hole 28 and a boss 29 into which the pin 13 that connects the arm 14 is inserted.

  The inner plate 24 has a pin hole 30 and a boss 31 into which a pin 20 that connects one end of the hydraulic cylinder 12 that rotates the second boom 11 is inserted. The inner plate 24 has a pin hole 32 and a boss 33 into which a pin 21 that connects one end of the hydraulic cylinder 15 that rotates the arm 14 is inserted.

  Reference numeral 24a denotes a protrusion provided on the upper portion of the inner plate 24, and reference numeral 24b denotes a hole provided in the protrusion 24a. The hole 24b is provided for hanging a lifting member such as a wire rope chain or a shackle. It is a thing.

  When lifting the construction machine, as shown in FIG. 1, a lifting member such as a wire rope 34 is hung on the hole 24b of the inner plate 24 of the second boom 11, and the other part, for example, as shown in FIG. Another wire rope 35 is also hung on the lower traveling body 1 side, and these wire ropes 34 and 35 are hung on a hook 36 of a crane (not shown) and are lifted by the crane.

  Thus, in this embodiment, a hole 24b for projecting a part of the inner plate 24 for connecting the hydraulic cylinder 12 of the second boom 11 upward and inserting the lifting member into the projecting portion 24a is provided. Since it provided, the apparatus for lifting can be implement | achieved only by changing the cutting or punching shape of the inner side board 24 of the 2nd boom 11. FIG. For this reason, the addition of the member for lifting a construction machine becomes unnecessary, and it can contribute to the cost reduction and man-hour reduction in manufacture. In addition, a part of the inner plate 24 provided in the second boom 11 is originally used as a lifting member, and no additional member is required, so that welding is not required and strength is easily guaranteed. Furthermore, it is not necessary to attach or detach a member for lifting, the labor required for setup before and after the lifting work is simplified, and management of the lifting member is also unnecessary.

  Further, in the present embodiment, as shown in FIG. 1, the position of the hole 24 b into which the lifting member is inserted in the state where the second boom 11 is most closed with respect to the first boom, 8 is set on an extension line 38 connecting the pivot pins 7 and 10 at both ends. Therefore, when the second boom 11 is closed to the first boom 8 side, the first boom 8 is made vertical and compact and the construction machine is lifted by the wire ropes 34 and 35, the second boom 11 is rotated by the lifting force. No moving force is generated. For this reason, the construction machine can always be lifted in a stable posture without the second boom 11 rotating relative to the first boom 8 during the suspension.

  The present invention can also be applied to a case where other working tools such as a bowl-shaped crushing tool, a breaker, a hawk, and a magnet are attached instead of the bucket as the working tool 16 to be attached to the working attachment 6. Further, the present invention can be applied to a case where a work tool is attached to the tip of the second boom 11.

It is a side view which shows one Embodiment of the construction machine of this invention. It is a side view of the 2nd boom of this embodiment. It is a top view of the 2nd boom of this embodiment. It is a bottom view of the 2nd boom of this embodiment. It is EE sectional drawing of FIG.

Explanation of symbols

1: Lower traveling body, 2: Turning device, 3: Upper turning body, 4: Driver's cab, 5: Hydraulic power unit, 6: Working attachment, 7: Pin, 8: First boom, 9: Hydraulic cylinder, 10: Pin: 11: Second boom, 12: Hydraulic cylinder, 13: Pin, 14: Arm, 15: Hydraulic cylinder, 16: Pin, 17: Work tool, 18: Hydraulic cylinder, 19: Link mechanism, 20, 21: Pin 22: outer plate, 23: connecting member, 24: inner plate, 24a: protrusion, 24b: lifting member hole, 26: pin hole, 27: boss, 28: pin hole, 29: boss, 30: pin Hole, 31: boss, 32: pin hole, 33: boss, 34, 35: wire rope, 36: hook

Claims (2)

Install the upper swing body on the lower traveling body via the swing device,
A work attachment is attached to the upper swing body,
In the construction machine, the working attachment includes a first boom that is attached to the upper swing body so as to be raised and lowered, and a second boom that is rotatably connected to the first boom.
The second boom has a pair of left and right outer plates and a pair of left and right inner plates provided integrally between these outer plates and having a boss connecting one end of a second boom rotating hydraulic cylinder,
Forming a protruding portion protruding upward as a part of the inner plate,
A construction machine characterized in that a hole for hanging a lifting member is provided in the protruding portion. The construction machine according to claim 1,
The position of the hole for hanging the lifting member in the state in which the second boom is most closed with respect to the first boom, the pin that pivotally attaches the first boom to the upper swing body, and the first boom A construction machine characterized in that it is set on an extension line connecting a pin pivotally attached to the second boom.

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