JP2005178641A - Cabin protecting structure of working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cabin protecting structure of a working machine configured so that a cabin is formed in the front of the body and a counterweight is installed in the rear, capable of protecting the cabin even if the working machine tumbles 180° without influencing the installing space of the machine body and the layout and without obstructing the operator's view field from the cabin. <P>SOLUTION: The cabin protecting structure of the working machine includes a protective structure equipped with a base table part installed on the counterweight and extending toward the rear surface of the cabin, a riser part extending along the rear surface from the base table part toward the top surface of the cabin, and an overhang extending from the top end of the riser part along the top surface toward the front end of the top surface. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cab protection structure for a work machine, and more particularly to a cab protection structure that protects an operator in a room by limiting damage to the cab when the work machine falls.

  A working machine in which a cab is provided at the front part of the machine body having a traveling body, a working device is projected in front of the cab and a counterweight is provided at the rear part of the machine body, for example, a hydraulic excavator as a typical example thereof Employs a cab guard formed so as to cover the entire cab as a cab protection structure in order to protect the operator in the cab if the aircraft falls due to some accident during traveling or work.

  A typical example of the cab guard includes a pair of inverted U-shaped frames standing upright from the body frame on the left and right sides of the cab, and a plurality of connecting beams that connect the pair of left and right frames ( For example, see Patent Document 1).

JP 2001-173017 A (FIG. 1)

  However, the conventional cab protection structure in the form as described above has the following problems to be solved.

Installation space:
Installation space around the cab is required to install the cab protection structure. In the limited aircraft space, the layout is difficult.

Operator view:
Since the frame of the cab protection structure is installed on the left and right sides of the cab, the view around the cab from the operator in the room, particularly in front of the left and right sides, which is important in traveling and working of the work machine, is hindered.

  The present invention has been made in view of the above-mentioned facts, and its technical problem is that it does not affect the installation space and layout of the fuselage, does not disturb the operator's view in the cab, and even if the work machine falls 180 degrees. It is an object to provide a cab protection structure for a work machine that can protect a cab.

  According to the present invention, as a driver's cab protection structure for a work machine that solves the above technical problem, a driver's cab protection structure for a work machine in which a driver's cab is provided at the front of the machine body and a counterweight is provided at the rear of the machine body. A base portion attached to the counterweight and extending toward the rear surface of the cab; an upright portion extending from the base portion along the rear surface toward the upper surface of the cab; and an upper end of the upper portion There is provided a cab protection structure for a work machine, comprising a protective structure having a flange extending from the portion along the upper surface toward the front end portion of the upper surface.

  Preferably, the flange portion is formed in a flat plate size and covering a substantially entire upper surface of the cab. The upright portion includes an opening facing the rear window of the cab. The base part, the upright part, and the collar part of the protective structure are integrally formed of a casting. Further, the base portion is detachably attached to the counterweight with bolts.

  According to the cab protection structure of the work machine configured according to the present invention, the protective structure is attached to the counterweight at the rear of the fuselage and is formed so as to cover the upper surface of the cab, thus affecting the installation space and layout of the fuselage. Further, there is provided a cab protection structure for a work machine that does not disturb the operator's field of view in the cab and that can protect the cab even if the work machine falls 180 °.

  Hereinafter, a cab protection structure for a work machine configured according to the present invention will be described in more detail with reference to the accompanying drawings illustrating a preferred embodiment of a hydraulic excavator that is a typical work machine.

  Referring to FIGS. 1 and 2, a hydraulic excavator generally indicated by reference numeral 2 is a driver's cab in the front part (left part of FIG. 1) of a machine body 6 having a pair of left and right crawlers 4, 4 as a traveling body. 8, and a counterweight 10 is provided at the rear part (right part in FIG. 1) of the airframe 6. A front working device 12 having a multi-joint arm mechanism as a working device and having a bucket at the tip is attached to the airframe 6 so as to be movable in the vertical direction. And as a cab protection structure, the protection structure 14 of the form extended to the upper surface 8a of the cab 8 and covering the cab 8 on the upper surface of the counterweight 10 is attached.

  The cab 8 is installed on the left side in the width direction of the machine body 6 (direction perpendicular to the paper surface of FIG. 1), and the counterweight 10 is installed to extend fully in the width direction of the machine body 6.

  The cab 8 is well known per se, is formed in a substantially rectangular parallelepiped shape, is formed by forming steel plates to form pillars, panels, doors, etc., and is assembled by welding or the like, and windows in the openings of the panels, doors, etc. Incorporated with sash and tempered glass. Therefore, it has a predetermined rigidity against damages such as deformation and crushing due to obstacle contact, collision and the like. A door 8b for getting on and off is provided on the left side surface of the cab 8, and a cab (not shown) on which an operator is seated is provided in the cab 8.

  The counterweight 10 is a well-known one that is positioned at the rear part of the body 6 and functions as a balance weight for the front working device 12. It is formed by cast steel or by joining and assembling steel members. The counterweight 10 is also robustly formed so as to function as a bumper at the rear of the fuselage 6. Therefore, the counterweight 10 which is a heavy object and a bumper is firmly attached to the airframe 6.

  A description will be given with reference to FIG. 3 together with FIGS. The counterweight 10 includes a plurality of screw hole bosses 10a opened on the upper surface of the counterweight 10, and a protection structure 14 is attached to the bosses 10a by bolts 16. A screw hole prepared for attaching a hanging hook when attaching or removing the counterweight to / from the machine body can also be used as a part of the plurality of screw holes.

  The protective structure 14 is attached to the upper surface of the counterweight 10 and extends toward the rear surface 8c of the cab 8. The base structure 14a extends from the pedestal portion 14a along the rear surface 8c toward the upper surface 8a of the cab 8. The upright part 14b and the collar part 14c extended toward the front-end part of the upper surface 8a along the upper surface 8a from the upper end part of the upright part 14b are provided. The base part 14a, the upright part 14b, and the flange part 14c of the protective structure 14 are integrally formed of a casting such as cast steel.

  A plurality of counterbore holes 14d for bolts 16 to be attached to the counterweight 10 are formed in the base portion 14a.

  The collar portion 14c is formed in a flat plate shape so as to cover substantially the entire surface of the rectangular upper surface 8a of the rectangular parallelepiped cab 8. The flange portion 14c is offset with respect to the base portion 14a in plan view in accordance with the installation positions of the cab 8 and the counterweight 10 in the airframe 6.

  A rectangular opening 14d facing the rear window 8d of the rear surface 8c of the cab 8 is formed in the upright portion 14b.

  The effect of the cab protection structure for a work machine as described above will be described with reference to FIGS.

Operator protection:
The protective structure 14 is attached to the strong and robust counterweight 10 and is formed so as to cover the substantially front surface and the rear surface 8c of the upper surface 8a of the cab 8. Therefore, when the work machine 2 falls due to some accident while traveling or during work, damage such as the cab 8 being crushed can be limited to secure the operator's space in the cab 8 and protect the operator. it can. The cab 8 can be protected even if the work machine 2 falls 180 degrees (upside down).

Installation space:
Since the protective structure 14 is attached to the counterweight 10 provided in the work machine 2, it is not necessary to secure a space for installation around the cab 8, and there is no problem of layout in a limited machine space.

Operator view:
Since the protective structure 14 is installed so as to extend from the rear side of the cab 8 and cover the upper surface 8a, it is important in traveling and working of the work machine 2, and around the cab from the operator in the room, in particular diagonally left and right. There is no hindrance to the front view. Further, since the protective structure 14 at the rear window 8d portion of the cab 8 is provided with the opening 14d, a rear view is also ensured.

Falling object:
The collar part 14c which covers the upper surface 8a of the cab 8 is formed in a flat plate shape. Therefore, the operator's cab 8 and the operator in the room are reliably protected against foreign matters from above such as falling objects.

Mounting with bolts:
Since the protective structure 14 is detachably attached to the counterweight 10 with bolts 16 and the existing screw holes for suspension are also divertable, a standard machine provided with screw holes for mounting when the work machine 2 is mass-produced. Is set, the protective structure 14 can be appropriately attached in accordance with the required specifications according to the working site of the work machine, and the work machine can be produced economically.

Function and appearance:
Since the protective structure 14 is integrally formed of a casting, the appearance of the work machine 2 can be improved, and both the function and the appearance can be achieved.

The side view of the hydraulic shovel which is a typical working machine provided with the cab protection structure of the working machine comprised according to this invention. The perspective view which looked at the hydraulic excavator shown in FIG. 1 from diagonally left back upper direction. The figure which showed the attaching part of the protection structure seeing in the AA arrow direction of FIG.

Explanation of symbols

2: Excavator (work machine)
8: cab 10: counterweight 14: protective structure 14a: base 14b: upright portion 14c: collar

Claims (6)

A cab protection structure for a work machine in which a cab is disposed at the front of the aircraft and a counterweight is disposed at the rear of the aircraft,
A base portion attached to the counterweight and extending toward the rear surface of the cab, a rising portion extending from the base portion along the rear surface toward the upper surface of the cab, and an upper surface from the upper end portion of the vertical portion And a protection structure having a flange extending toward the front end portion of the upper surface along the cab.   The cab protection structure according to claim 1, wherein the flange portion is formed to have a size covering substantially the entire upper surface of the cab.   The cab protection structure for a work machine according to claim 2, wherein the flange is formed in a flat plate shape.   The cab protection structure for a working machine according to claim 1, wherein the upright portion includes an opening facing the rear window of the cab.   The cab protection structure for a working machine according to any one of claims 1 to 4, wherein the base portion, the upright portion, and the flange portion of the protective structure are integrally formed of a casting.   The cab protection structure for a work machine according to claim 1, wherein the base portion is detachably attached to the counterweight with a bolt.

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