JP2007162404A - Hydraulic shovel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic shovel with functions of hanging the hydraulic shovel in a stable state by shortening the whole machine body length, protecting the machine body from interference and a collision with surrounding obstacles, functioning as an additional counterweight to the hydraulic shovel, and effectively protecting a driver's cab in case of a fall. <P>SOLUTION: The hydraulic shovel 2 comprises a frame body 20 erected upward at the outer edge of a super structure 6 mounted on a lower structure 4 so as to be turnable around an axis on the opposite side to a working arm device 12 mounted to the super structure 6 with respect to the axis. The frame body 20 is integrally provided with a base 22 mounted to the super structure; a body 28 having a pair of column members extending upward from the base part 22, and a connecting member for connecting the respective upper parts of the column members; and a pair of hanging parts 30 provided at respective upper ends of the column members. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a hydraulic excavator having a configuration effective particularly for a relatively small hydraulic excavator.

The hydraulic excavator includes a lower traveling body and an upper swinging body that is pivotably mounted on the lower traveling body, and a relatively small hydraulic excavator (see, for example, Patent Document 1) is provided at the center of the upper swinging body. , A work arm device on one side across the cab, an engine room on the other side, and a soil removal device on the lower traveling body.

This will be specifically described with reference to FIG. The hydraulic excavator denoted by reference numeral 2 includes a lower traveling body 4 and an upper revolving body 6 that is pivotably mounted on an axis 5 that extends vertically on the lower traveling body 4. The operator's cab 8 is located in the central axis 5 of the upper swing body 6, the work arm device 12 having the bucket 10 on one side (right side in FIG. 5) sandwiching the axis 5, and the counterweight 16 on the lower side on the other side. Is provided with an engine compartment 14. The lower traveling body 4 is provided with a soil removal device 19 having a soil removal plate 18.
JP 2003-129520 A (FIG. 1)

The hydraulic excavator having the form as described above has the following problems to be solved. This will be described with reference to FIG.

Issues when hanging the aircraft:
When the excavator 2 is suspended by a crane and carried into, for example, an underground site, an inboard site, a storage location, etc., one of the wires W1 from the hanging hook 36 is connected to the earth removing plate 18 of the earth removing device 19 of the lower traveling body 4. The work arm device 12 is hung on two suspension holes 18a and 18a in the width direction (perpendicular to the paper surface of FIG. 5), and the other W2 is positioned on the other side of the soil removal device 19 by turning the upper turning body 6. Is hung on the suspension hole 13. Accordingly, since the earth removal device 19 and the work arm device 12 are located on the opposite side in the lifted state, the overall length L of the lifted machine body becomes long, and a large space is required at the carry-in entrance, storage location, and the like. Further, the wire W1 connected from the hanging hook 36 to the earth discharging plate 18 is longer than the other W2, and the suspended state tends to become unstable. Furthermore, in order to prevent the wire W1 from interfering with the cab 8, it is necessary to raise the position of the hanging hook 36, and the suspended state is likely to become more unstable.

Collision protection challenges:
When the excavator 2 is used in a narrow field such as an underground space, a building, or a tunnel, the rear portion of the engine room 14 is likely to interfere with or collide with surrounding obstacles. Therefore, a protection means against interference / collision is desired.

Counterweight issues:
When the excavator 2 performs heavy excavation, heavy lifting, etc. using the bucket 10 of the work arm device 12, the engine compartment 14 side of the fuselage is easily lifted, so that an additional weight is added to the counterweight 16 to improve the balance. Increase is required. If necessary, an additional counterweight 17 is attached to the outer edge of the counterweight 16. That is, there is a problem related to a request for increasing the weight of the counterweight.

Fall protection issues:
If the hydraulic excavator 2 falls or falls during the work, the work arm device 12 protects the cab 8 from being crushed to some extent. However, in the event of an emergency, a more effective means of protection during a fall is desired.

The present invention has been made in view of the above-mentioned facts, and its technical problem is that a hydraulic excavator, particularly a relatively small hydraulic excavator, can be hung in a stable state by shortening the overall length of the fuselage. It can also protect the aircraft from interference and collision with surrounding obstacles, can function as an additional counterweight, and more effectively protect the cab in the event of a hydraulic excavator falling It is an object to provide a hydraulic excavator equipped with means.

According to the present invention, as a hydraulic excavator that solves the above technical problem, a working arm device attached to an upper swing body of an upper swing body that is pivotably mounted around an axis extending vertically on the lower traveling body. On the opposite outer edge across the axis, a frame body is provided to stand upward, and the frame body is integrated with a base portion attached to the upper swing body and the outer edge extending upward from the base portion. A pair of column members disposed at predetermined intervals along the column member and a main body portion having a connecting member that connects the upper portions of the column members, and a pair of suspension portions provided at the upper ends of the column members. A hydraulic excavator is provided.

Preferably, the base portion of the frame body is attached to the lower surface of the upper swing body.

A hydraulic excavator configured according to the present invention includes a frame body standing upwards on an edge portion on the opposite side of the work arm device across the swing axis of the upper swing body. Therefore, it is possible to suspend the entire length of the machine body in a short and stable state by hanging the wire on the upper part of the frame body and the work arm device without using the earth removing device. In addition, the frame can protect the aircraft from interference and collision with surrounding obstacles, and also functions as an additional counterweight. In addition, the frame functions as a means for protecting the cab in the event of a hydraulic excavator falling.

Hereinafter, a hydraulic excavator constructed in accordance with the present invention will be described in more detail with reference to the accompanying drawings illustrating preferred embodiments. Parts substantially the same as those in FIG. 5 are denoted by the same reference numerals.

A description will be given with reference to FIG. The hydraulic excavator 2 includes a lower traveling body 4 and an upper revolving body 6 that is pivotably mounted about an axis 5 that extends vertically on the lower traveling body 4. The upper swing body 6 has a cab 8 on the central axis 5 and an articulated work arm device 12 having a bucket 10 on one side (right side in FIG. 1) sandwiching the axis 5 swings up and down. The engine chamber 14 is attached to the other side, and a counterweight 16 is attached to the lower portion of the engine chamber 14 so that the operation can be freely performed. A soil removal device 19 having a soil removal plate 18 is attached to the lower traveling body 4.

On the opposite side of the upper arm 6 to the work arm device 12 across the axis 5, the outer edge of the engine chamber 14 is provided with a frame 20 that is attached to the lower surface of the upper swivel 6 and stands upward. .

The frame 20 will be described with reference to FIGS. The frame body 20 is integrally formed by welding steel members to each other, and has a base portion 22 attached to the upper swing body 6 and extends upward from the base portion 22 with a predetermined distance S (along the outer edge. 2) and a main body portion 28 having a pair of connecting members 26, 26 connecting the upper portions of the pair of column members 24, 24 and the column members 24, 24, and upper ends of the column members 24, 24, respectively. A pair of suspension portions 30, 30 provided in the

The base 22 will be described mainly with reference to FIG. The base portion 22 includes a pair of substrates 22a and 22b formed of thick plates that are attached to the flat lower surface of the revolving unit frame 32 shown by a two-dot chain line that forms the bottom of the upper revolving unit 6. Each of the substrates 22a and 22b includes a plurality of bolt holes 22c, and is attached to the lower surface of the revolving body frame 32 by bolts (not shown) that pass through the bolt holes 22c.

The main body 28 will be described. The column member 24 is formed by a rectangular tube having a rectangular cross section. The interval S between the pair of pillar members 24, 24 is defined so as to prepare a space so that maintenance and inspection of equipment in the adjacent engine compartment 14 (FIG. 1) can be easily performed. The connecting member 26 is formed by a rectangular tube having a square cross section, and a pair of upper and lower ends are provided on the upper end side of the column member 24. Between each of the column members 24 and 24 and the base plates 22a and 22b, there are provided columns 34 and 34 each having a rectangular tube with a rectangular cross section attached thereto obliquely. The upper end of the main body 28 is defined so as to be located above the engine compartment 14 (FIG. 1).

The suspension portion 30 is provided in a rectangular shape with a thick plate on each end portion side of the column member 24 at the joint portion between the pair of column members 24 and 24 and the upper connecting member 26. I have.

1 and 5 and mainly with reference to FIG. 1, the operation and effect of the hydraulic excavator 2 including the frame 20 as described above will be described.

Aircraft suspension:
When hanging the excavator 2, as shown in FIG. 1, one of the wires W <b> 2 from the hanging hook 36 is hung on the hanging hole 13 of the work arm device 12, and the other W <b> 1 is paired with a pair of hanging portions 30 on the upper part of the frame body 20. 30 It hangs in each suspension hole 31. The earth removing device 19 of the lower traveling body 4 is positioned on the working arm device 12 side. Therefore, the total length L of the machine body to be lifted is shorter than that of the conventional machine (FIG. 5), and the space such as the carry-in entrance and storage place of the machine body can be reduced. The wire W1 from the hanging hook 36 to the hanging portion 30 of the frame 20 can be shorter than the conventional one (FIG. 5), and the suspended state can be stabilized. Furthermore, the position of the hanging hook 36 can be made lower than in the prior art (FIG. 5), and the suspended state can be further stabilized.

Collision protection:
Since the frame body 20 is provided outside the outer edge of the engine compartment 14, the interference and collision between the surrounding obstacles and the engine compartment 14 can be surely prevented and protected, particularly when used in a narrow site. Can do.

Counterweight:
The weight of the frame body 20 located on the opposite side of the work arm device 12 across the turning axis 5 of the upper turning body 6 can function as an additional counterweight. The weight can be further increased by making the rectangular tube constituting the frame body 20 a solid bar, or by filling heavy objects such as iron scrap and concrete into the rectangular tube.

Fall protection:
In the unlikely event that the excavator 2 falls or falls, the frame 20 together with the work arm device 12 protects the cab 8 from being crushed to a minimum. That is, for example, even if the top of the excavator 2 is reversed, the cab 8 is crushed by the surface connecting the frame body 20 and the work arm device 12 as shown by a two-dot chain line P in FIG. be able to.

As described above, the frame body 20 erected upward on the opposite edge of the work arm device 12 across the swing axis 5 of the upper swing body 6 of the excavator 2 stabilizes the machine body with a short overall length. Can be hung in a state, can protect the aircraft from interference and collision with surrounding obstacles, functions as an additional counterweight, and also protects the cab 8 in the event of a hydraulic excavator 2 falling over Also works.

Further, the frame body 20 is detachably attached to the lower surface of the upper revolving body 6 with bolts, so there is no need to basically disassemble and refurbish the airframe, it is easy to install, and can easily be retrofitted to an existing excavator. can do.

Further, since the frame body 20 includes an open space between a pair of standing pillar members 24, 24 having an interval S and the upper connecting members 26, 26, maintenance of the equipment in the engine compartment 14 is performed from this portion.・ Easy inspection.

The side view explaining the structure of the hydraulic excavator comprised according to this invention. The front view of the frame seen in the AA arrow direction of FIG. The side view of the frame seen from the BB arrow direction of FIG. The top view of the frame seen in the CC arrow direction of FIG. The side view explaining the structure of the conventional hydraulic shovel.

Explanation of symbols

2: Hydraulic excavator 4: Lower traveling body 6: Upper swing body 12: Working arm device 20: Frame body 22: Base portion 24: Column member 26: Connection member 28: Main body portion 30: Suspension portion

Claims (2)

The upper swinging body mounted on the lower traveling body so as to be pivotable about an axis extending vertically is erected upward on the outer edge on the opposite side of the work arm device mounted on the upper swinging body. With a frame
This frame is integrated,
A base to be attached to the upper swing body,
A main body having a pair of column members disposed at predetermined intervals along the outer edge extending upward from the base and a connecting member that connects the upper portions of the column members;
A hydraulic excavator comprising a pair of suspension portions provided at the upper end of each of the column members. The base of the frame is attached to the lower surface of the upper swing body,
The hydraulic excavator according to claim 1.

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