JP2012225042A - Hydraulic shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic shovel which can achieve cost reduction by decreasing the number of components of a machine body hoisting structure.SOLUTION: A hanging metal fitting 32 provided with a through-hole 34 to connect a hoisting wire rope 65 via a hanging clamp 61 is formed integrally with a boss part 31 for connecting a pin projecting laterally at a lengthwise intermediate portion of a boom 16 with a boom cylinder 30 for raising/bringing down the boom. The hanging metal fitting 32 is formed integrally with the boss part 31 by casting or the like. Consequently, the number of components can be decreased. Cost can be also reduced because there is no change in other components other than integrating the hanging metal fitting 32 with the boss part 31.

Description

  The present invention relates to a hydraulic excavator, and more particularly to a hydraulic excavator suitable for lifting a machine body using a wire rope for lifting.

  A hydraulic excavator equipped with a work implement such as a bucket, grapple, fork, lifting magnet, crushing tool, vibration breaker, etc. and a front work machine including a boom and arm, etc. is installed on the building floor, the bottom of the underground hole, the basement, etc. When carrying in or out of the machine, the aircraft is lifted by a crane via a wire rope. When lifting the aircraft with a wire rope, for example, a suspension ring is provided on the counterweight mounted on the rear part of the swing body of a hydraulic excavator, one end of the wire rope is hooked on this suspension ring, and the other end of the wire rope is connected to the boom. It hangs around from the lower side through a pad etc. in a bent part. Then, there is a method of lifting the machine body by hooking the tip of the central portion of the wire rope to the hook 71 of the crane.

In the above-described method, it takes time to work around the wire rope around the bent portion of the boom.
Therefore, there is an invention in which lifting brackets are provided on both sides of the boss at the base of the boom (see, for example, Patent Document 1). In this structure, the boom of the work attachment is lifted up by the wire rope while balancing the fuselage in a state where the boom of the work attachment is raised substantially horizontally so that the center of gravity of the fuselage is located below the suspension fitting.

JP 2000-45333 A

However, in the invention described in Patent Document 1, it is difficult to balance the airframe because the lifting wire rope is hooked and lifted only by the base of the boom.
In addition, there is a problem in that the number of parts is increased, the weight is increased, and the cost is increased because the lifting brackets are provided on both sides of the boss at the base of the boom.

  The hydraulic excavator of the present invention includes a traveling body, a revolving body that is rotatably installed on the traveling body, a boom whose base is rotatably supported on a revolving frame of the revolving body, and one end that is rotatable on the revolving frame. The boss part provided at the other end is connected to the boom by a pin, and a hydraulic cylinder that raises and lowers the boom and a suspension clamp that is integrally formed on the boss part and on which a wire rope for lifting the aircraft is hung are connected. And a hanging metal fitting.

  According to the hydraulic excavator of the present invention, since the lifting bracket for lifting the fuselage to which the suspension clamp is connected is integrally formed on the boss portion of the rod tip of the hydraulic cylinder that raises and lowers the boom, the number of parts is reduced and the weight is reduced. It is also possible to reduce the cost and reduce the cost.

The side view of the whole hydraulic excavator of Embodiment 1 of the present invention. The side view which shows the state which lifted the hydraulic shovel shown in FIG. The principal part of the lifting structure in FIG. 2 is shown, (a) is an enlarged side view, (b) is a plan view of the boss part seen from the X direction in FIG. 3 (a). FIG. 2 is an exploded perspective view around a boom bent portion of the hydraulic excavator illustrated in FIG. 1. 5A and 5B show Embodiment 2 of the present invention, in which FIG. 5A is a side view around the boss portion, and FIG. 5B is a plan view of the boss portion viewed from the X direction in FIG. FIG. 6 is a side view of the hydraulic excavator illustrated in FIG. 5 in a suspended state. The side part around the boss | hub part which shows Embodiment 3 of this invention.

[Embodiment 1]
Hereinafter, an embodiment of a hydraulic excavator of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of the entire hydraulic excavator.
The excavator 1 includes a traveling body 2, a revolving body 3, a revolving wheel 4, and a front work machine 5.
The endless track type traveling body 2 supports the revolving body 3 via a revolving wheel 4 so as to be able to turn. The swivel body 3 has a swivel frame 11, and the swivel frame 11 is attached to the traveling body 2 via the swivel wheel 4 so as to be turnable. A driver's cab 12 is provided at the front portion of the swivel frame 11, the front work machine 5 is disposed at the center of the swivel frame 11, and a counterweight 13 is disposed at the rear portion of the swivel frame 11.

The front work machine 5 includes a boom 16, an arm 17 whose base is attached to the tip of the boom 16, and a work tool (hereinafter referred to as a bucket) 18 such as a bucket attached to the tip of the arm 17. . The boom 16 is rotated in the vertical direction by the boom cylinder 30, the arm 17 is rotated by the arm cylinder 22, and the bucket 18 is rotated by the bucket cylinder 23.
Although illustrated as the bucket 18 in FIG. 1, it may be replaced with a grapple, a fork, a lifting magnet, a crushing tool, a vibration breaker, or the like instead of the bucket 18.

The boom 16 has a base portion 16a having a through hole. The boom 16 is rotatably attached to the revolving frame 11 by a pin inserted into the through hole of the base portion 16a and the through hole provided in the bracket 11a of the revolving frame 11. ing. Although not shown, the lower end of the tube of the boom cylinder 30 is rotatably supported by the revolving frame 11. The boom cylinder 30 is rotatably connected to a side surface of the bent portion of the boom 16 via a pin via a boss portion 31 provided on the rod tip side. As the boom cylinder 30 expands and contracts, the boom 16 rotates in the vertical direction about the base portion 16a.
In addition, a suspension fitting 42 having a suspension hole 41 for lifting the airframe is provided behind the counterweight 13. The hanging metal fittings 42 are provided on the side surfaces of both sides of the counterweight 13 (both sides in the vertical direction in FIG. 1).

2 is a side view showing a state in which the excavator shown in FIG. 1 is lifted, FIG. 3 shows a main part of the lifting structure in FIG. 2, and FIG. 3 (a) is a rod side of the boom cylinder 30. FIG. 3B is a plan view of the boss portion viewed from the X direction in FIG. 3A, and FIG. 4 is an exploded view around the bent portion of the boom 16 of the excavator shown in FIG. It is a perspective view.
As shown in FIG. 4, the boom cylinder 30 is provided on both sides of the boom 16.
A boss 31 called a clevis is usually provided on the tip side of the rod 30a of the boom cylinder 30. The boss portion 31 has a through hole 33 through which the pin 51 is inserted. A suspension fitting 32 is provided on the upper side of the boss portion 31. The suspension fitting 32 is formed integrally with the boss portion 31 by casting or welding, and a through-hole 34 into which a pin 62 described later is inserted is formed in the upper portion of the suspension fitting 32.
The through hole 33 of the boss part 31 provided on the distal end side of the rod 30a of each boom cylinder 30 and the through hole 16b provided on the side wall of the boom 16 are aligned, and the pin 51 is inserted into the through holes 33 and 16b. To do. Thereby, the front end side of the rod 30a of each boom cylinder 30 is attached to the boom 16 so that rotation is possible.

61 is a suspension clamp which is usually called a shackle. The hanging clamp 61 has a substantially U shape, and through holes 63 through which pins 62 are inserted are provided on both sides of the lower end portion. The wire rope 65 has a suspension ring 66 whose tip is closed.
In order to connect the excavator 1 to the lifted state by the wire rope 65, the suspension ring 66 is passed from the lower end of the suspension clamp 61 and is coupled to the suspension clamp 61. Next, the pin 62 is passed through the one through hole 63 of the suspension clamp 61, the through hole 34 of the suspension fitting 32, and the other through hole 63 of the suspension clamp 61, and the suspension clamp 61 is attached to the suspension fitting 32.

FIG. 3A shows a state in which the boss portion 31 is connected by a wire rope 65 so as to be able to be lifted. FIG. 3B is a plan view of the boss portion viewed from the X direction perpendicular to the axis of the boom cylinder 30 in FIG.
In order to lift the excavator 1 with the wire rope 65, first, as shown in FIG.
And the suspension ring 66 of the wire rope 65a is connected with the suspension metal fitting 32 provided in the boss | hub part 31 of the rod 30a of the boom cylinder 30 via the suspension clamp 61 as mentioned above. Further, the suspension ring 66 of the wire rope 65 b is connected to the suspension fitting 42 provided on the upper rear side of the counterweight 13 via the suspension clamp 61. The connection between the suspension ring 66 of the wire rope 65b and the suspension fitting 42 can be performed in the same manner as when the wire rope 65a is linked to the suspension fitting 32 provided on the boss portion 31 of the rod 30a.
The wire ropes 65 a and 65 b are connected to a hanging fitting 32 on both side surfaces of the boom 16 and a hanging fitting 42 provided on the upper rear side of the counterweight 13, respectively. That is, a pair of left and right wire ropes 65 a and a pair of left and right wire ropes 65 b, a total of four wire rope 65 suspension rings 66 are connected to the suspension fittings 32 and 42.

  Then, the excavator 1 is lifted by hooking the suspension ring on the upper side of each wire rope 65a, 65b to the hook 71 of the crane and driving the crane. In this case, the through-hole 34 of the suspension fitting 32 is formed in a direction substantially perpendicular to the expansion / contraction direction of the boom cylinder 30 so as to incline in substantially the same direction as the wire rope 65 hooked on the hook 71 on the upper side. It is desirable.

  As described above, according to the embodiment of the present invention, the suspension fitting 32 for connecting the suspension clamp 61 that connects the lifting wire rope 65 is integrated with the boss portion 31 on the distal end side of the rod 30a of the boom cylinder 30. Therefore, the number of parts can be reduced and the cost can be reduced. Further, in the conventional structure in which the hanging bracket is attached to the pin that supports the base of the boom, the length of the pin is increased, and the weight of the hydraulic excavator is increased correspondingly. However, in the present invention, the tip of the rod 30a of the boom cylinder 30 is increased. Since the suspension fitting 32 is provided on the boss portion 31 on the side, the length of the pin 51 is not changed, and the weight can be increased by the weight of the suspension fitting 32.

In the first embodiment, the case has been described where the excavator 1 is lifted with the boom 16 lying down.
However, in actual work, there are cases where the site to be lifted or hung is narrow and the work cannot be performed with the boom 16 lying down.
In such a case, it is necessary to lift the excavator 1 with the boom 16 standing. Next, as a second embodiment, a structure suitable for lifting the boom 16 in a standing state will be described.

[Embodiment 2]
FIG. 5 shows a second embodiment of a lifting structure of a hydraulic excavator according to the present invention. FIG. 5 (a) is a side surface portion around the boss portion 31 on the tip side of the rod 30a of the boom cylinder 30, and FIG. It is a top view of the boss | hub part 31 seen from the X direction in Fig.5 (a).
In the second embodiment, the suspension fitting 32A formed integrally with the boss 31 on the tip side of the rod 30a of the boom cylinder 30 has two through holes 34a and 34b. The through hole 34 a is provided in a direction that intersects with the expansion and contraction direction of the boom cylinder 30, as in the first embodiment. On the other hand, the through hole 34b is provided on an extension line of the boom cylinder 30 in the expansion / contraction direction.

FIG. 6 is a side view of the state in which the excavator 1 is lifted by connecting the wire rope 65a to the suspension clamp 61 connected to the through hole 34b provided in the suspension fitting 32A with the boom 16 raised. Also in this case, the wire rope 65 b is connected to the hanging metal fitting 42 provided on the upper rear side of the counterweight 13.
FIG. 6 also shows the front working machine 5 with the boom 16 lying down as a reference.
Other than the above, the second embodiment is the same as the first embodiment, and the same members are denoted by the same drawing numbers and the description thereof is omitted.

In the second embodiment, the same effect as in the first embodiment is obtained.
Further, in the second embodiment, the excavator 1 can be lifted in the state where the boom 16 is lying down or standing, and by selecting one of the postures of the boom 16 depending on the situation of the work site, The efficiency of the lifting work can be improved.
Note that the second embodiment has a structure in which two through holes 34a and 34b are provided in the hanging metal fitting 32A. However, three or more through holes may be provided. In that case, it is preferable to determine in advance the direction in which the through hole 34 is provided, assuming the inclination angle of the boom 16 when the airframe is lifted.

[Embodiment 3]
FIG. 7 shows Embodiment 3 of the lifting structure for a hydraulic excavator according to the present invention.
In the third embodiment, the through hole 34c provided in the suspension fitting 32B formed integrally with the boss portion 31 on the tip side of the rod 30a of the boom cylinder 30 is located between the through holes 34a and 34b in the second embodiment. In other words, the through hole 34c is formed in a middle direction between the expansion / contraction direction of the boom cylinder 30 and the direction perpendicular to the expansion / contraction direction. By forming the through hole 34c of the hanging bracket 32B at such a position, the excavator 1 can be lifted in any state from the standing state to the falling state of the boom 16 or in an intermediate state thereof. Is possible.

  According to the third embodiment, the same effect as that of the first embodiment is obtained. Further, since the hydraulic excavator 1 can be lifted even when the boom 16 is laid down or standing, the same effects as those of the second embodiment can be obtained. In this case, the number of parts can be reduced as compared with the case of the second embodiment, which is advantageous in terms of weight and cost.

  As described above, according to the first to third embodiments, since the suspension fitting 32 for connecting the suspension clamp 61 is formed integrally with the boss portion 31, the number of parts can be reduced and the cost can be reduced. There is an effect that it is possible.

In the above-described embodiment, the description has been given of the case of the hydraulic excavator with the bucket 18 mounted as a working tool, but the hydraulic pressure with the grapple, the fork, the lifting magnet, the crushing tool, the vibration breaker and the like replaced with the bucket 18. It can be applied to excavators.
Further, in the present embodiment, the lifting wire rope 65 is connected to the suspension fitting 32 provided integrally with the boss 31 on the tip end side of the rod 30 a of the boom cylinder 30 and the suspension fitting 42 provided on the counterweight 13. The structure is However, instead of the hanging metal fitting 42 provided on the counterweight 13, a hanging metal fitting may be provided at another part of the excavator 1 such as the frame of the traveling body 2 or the revolving body 3.

  In addition, the excavator of the present invention can be variously modified within the scope of the gist of the invention. In short, the traveling body, the swiveling body installed so as to be able to swivel on the traveling body, and the base portion swivel. A boom that is pivotally supported by the swivel frame of the body, a boom cylinder that is pivotally supported at one end by the swivel frame, a boss portion provided at the other end is connected to the boom by a pin, and the boom is raised and lowered; What is necessary is just to comprise what is formed in the boss | hub part, and comprises the hanging metal fitting to which the suspension clamp with which the wire rope for airframe lifting is hung is connected.

DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Traveling body 3 Rotating body 4 Rotating wheel 11 Rotating frame 16 Boom 16a Base part 17 Arm 18 Working tool 22 Arm cylinder 23 Bucket cylinder 30 Boom cylinder 31 Boss part 32, 32A, 32B Hanging bracket 42 Hanging bracket 61 Hanging clamp

Claims (5)

A traveling body,
A revolving structure installed to be able to revolve in the traveling body;
A boom whose base is rotatably supported by the revolving frame of the revolving structure;
A boom cylinder that is pivotally supported at one end by the swivel frame, a boss portion provided at the other end is connected to the boom by a pin, and raises and lowers the boom;
A hydraulic excavator comprising a suspension fitting integrally formed with the boss portion and coupled with a suspension clamp on which a wire rope for lifting the aircraft is hung.   2. The hydraulic excavator according to claim 1, wherein the suspension fitting is integrally formed on the boss portion by casting or welding.   The hydraulic excavator according to claim 1 or 2, wherein the hanging metal fitting has a through-hole inserted into the pin together with the suspension clamp, and the through-hole inserted into the pin is approximately in the direction of expansion and contraction of the boom cylinder. A hydraulic excavator characterized by being formed in a direction perpendicular to the vertical axis.   4. The hydraulic excavator according to claim 1, wherein the suspension fitting includes a plurality of through holes through which pins are inserted together with the suspension clamp. 5. 5. The hydraulic excavator according to claim 4, wherein one of the through holes through which the pin is inserted is formed substantially in the expansion / contraction direction of the boom cylinder, and the suspension metal fitting is provided in addition to the through hole through which the pin is inserted. One of the hydraulic excavators is generally formed in a direction perpendicular to the direction of expansion and contraction of the boom cylinder.

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