JP4033386B2 - Handrail structure in construction machinery - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention belongs to the technical field of handrail structures in construction machines such as hydraulic excavators.
[0002]
[Prior art]
There are various types of construction machines today, and the prior art will be described using a hydraulic excavator as an example. In the case of a hydraulic excavator, an upper swing body provided with a work attachment such as a bucket is rotatably supported on a lower travel body provided with a traveling device, and an engine or the like is mounted on such an upper swing body. Therefore, a moving space for performing such maintenance is secured on the upper surface of the upper swing body. For example, when getting into and out of the moving space from the traveling device, for example, a step is provided in the upper swing body to facilitate getting on and off, and a passage from the step boarding portion to the engine room is formed. However, these steps and passages are often formed at the end of the upper swing body, so that the handrail is erected from the edge of the upper swing body so as not to disturb the moving operator. Is provided. As such a handrail, a conventional handrail having a structure in which one lower end (front end) is fixed to an airframe frame and the other lower end (rear end) is fixed to an airframe side plate is known. However, each of these handrails has a so-called cantilever support structure in which the lower end is supported on the airframe side and protrudes upward, so that the handrail vibrates following the airframe vibration, so A large load acts on the belt, and there is a risk of occurrence of problems such as deformation, breakage, loosening of tightening bolts, and the like.
[0003]
[Problems to be solved by the invention]
Therefore, as a countermeasure, the handrail is made thicker or thicker to increase the strength, and fixed with a bracket that is more rigid than the handrail body. It is advocated to take anti-vibration measures such as wearing. However, in the case of these, if there is a twist as a cause of the main body breakage, it will be counterproductive, and the main body side will be damaged and the main body side reinforcement will be required. There is a problem such as an increase in cost, and there is a problem to be solved by the present invention.
[0004]
[Means for Solving the Problems]
The present invention has been created in order to solve these problems in view of the above circumstances, and is a front-rear cover for covering a tank on the right side of an upper swing body that is swingably provided on the lower traveling body 1. Each of the front ends of the front cover body and the upper revolving body body frame is configured to be movable to an engine room side cover body provided at the rear of the body with the upper surface of the cover body as a boarding step. In a construction machine in which a surface is provided with upper and lower stepping steps for getting on and off the front cover body, a front handrail and a rear handrail are provided on the right edge of the step surface. The rail bends with its front end facing downward and rearward, with its bent tip biased to the right, at a position slightly higher than the lower step, at the lower right of the front cover body A bent portion that is bolted to the surface, and extends from the bent portion to a position higher than the upper step in a substantially vertical state, and is fixed to the upper step while being biased to the left side via a bracket. A rear handrail comprising: a vertical portion that is inclined to a front low rear height from the upper end portion of the vertical portion, and a rear end portion that is bent horizontally toward the rear. The front cover body rear surface portion is bent and formed into a substantially inverted U shape, and the lower end portion is fixed to the front surface of the front cover body that rises in a step shape of the front cover body, and is higher than the fixed position via the bracket. And a rear side portion fitted and fixed to a cylindrical support whose lower end is fixed to the upper surface of the rear cover body. construction machine characterized by being configured with bets It is a definitive hand rail structure.
And by comprising in this way, the support to the body side of a handrail becomes a two-point support structure of a front-end | tip part and its upper part, and effective strength can be measured, and generation | occurrence | production of an unnecessary vibration can be prevented. .
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a lower traveling body constituting a hydraulic excavator, and 2 denotes an upper revolving body that is rotatably supported by the lower traveling body 1. Various member devices such as a cab 3 arranged on the left side of the unit, a boom 4 to which a bucket-type attachment protruding forward from the center of the front part is attached, and a cover body 5 provided at the rear part to constitute an engine room In the present embodiment, the front and rear cover bodies 6 and 7 for covering the hydraulic oil tank, the fuel tank and the like are provided on the right side of the machine body. The upper surfaces (top plate surfaces) of the cover bodies 6 and 7 serve as boarding steps so that an operator can move to the engine room side cover body 5. Further, the front end surface of the front cover body 6 and the body frame 2a of the upper revolving body 2 are provided with steps 8 and 9 for landing on and off the cover body 6 so that the operator can wear the lower traveling body 1 After getting on the body 1a, it is possible to use the steps 8 and 9 to get on and off without difficulty.
[0006]
10 is a front handrail, 11 is a rear handrail (corresponding to the handrail of the present invention), and these handrails 10 and 11 are arranged in a planted manner on the right edge of the cover bodies 6 and 7. However, the front cover body 6 is slightly higher than the step 8 in a state where the front end portion of the front handrail 10 is formed with a bent portion 10a bent toward the lower rear, and the bent tip portion 10b is biased to the right side. Bolts are fixed to the lower right side of the. The front handrail 10 has a vertical portion 10c that is in a substantially vertical state from the bent portion 10a to a position slightly higher than the step 9 and extends upward. The rear end portion 10e that is bent backward in a horizontal shape 10d is fixed to the front upper end portion of the rear handrail 11 but is located at the foremost side of the handrail 10. The vertical portion 10 c is fixedly supported by the step 9 at a position where the vertical portion 10 c is biased to the left side via the bracket 12.
[0007]
On the other hand, the rear handrail 11 is bent into a substantially inverted U shape, and the lower end portion 11b of the front side portion 11a is bolted to the rear surface portion 6a that rises in a step shape of the front side cover body 6, and is attached to the upper half side intermediate portion. A rear end portion 10e of the front handrail 10 is fixed. Further, the rear side portion 11 c of the rear handrail 11 is supported by being fitted and fixed to a cylindrical support 13 whose lower end is fixed to the upper surface of the rear cover body 7. Further, the rear handrail front side portion 11a is fixed to the front cover body rear surface portion 6a via the bracket 14 at a position slightly higher than the support position of the front end portion lower end 11b.
[0008]
In the configuration as described above, the front handrail 10 is fixed in a state in which a bent front end portion 10b on the front end side and a vertical portion 10c slightly spaced above this are supported at two points on the airframe side. As a result, the front handrail 10 has a strong support structure on the lower end side, and inadvertent vibration is prevented. Moreover, since the front end portion 11a of the rear handrail 11 has a two-point support structure, the strength can be increased.
[0009]
Furthermore, regarding the front handrail 10, since the vertical portion 10c is fixed to the step 8 where the strength is increased as much as possible, the fixing strength is also increased. Further, the bent front end portion 10b of the front handrail 10 is fixed to the cover body 6 while being biased to the right side, and the upper vertical portion 10c thereof is biased to the left side via the bracket 12 in step 9. As a result, the front side of the front handrail 10 has a support structure distributed to the left and right, so that the strength can be further increased and the generation of vibrations can be suppressed.
[0010]
On the other hand, the rear handrail 11 has a fixed structure in which the front side portion 11a is supported by the cover body 6 at two upper and lower points, and the cover body 6 is also used as a support member. Since the rear surface portion 6 a is formed so as to rise up to 6, the support structure can be easily used while using the cover body 6. Incidentally, since the rear end side of the rear handrail 11 is fitted and supported by the cylindrical support 13, it can be firmly supported also on this side.
[Brief description of the drawings]
FIG. 1 is a side view of a hydraulic excavator.
FIG. 2 is a plan view of a hydraulic excavator.
FIG. 3 is a front view of a hydraulic excavator.
FIG. 4 is an enlarged front view of a main part of a handrail attachment part.
[Explanation of symbols]
6 Cover body 9 Step 10 Front handrail 11 Rear handrail 12 Bracket 14 Bracket

Claims (1)

A front and rear cover body for covering the tank is provided on the right side of the upper revolving body provided on the lower traveling body 1 so as to be able to swivel, and the upper surface of the cover body is moved to the engine room side cover body provided at the rear part of the aircraft as a boarding step. In a construction machine in which upper and lower legging steps are provided on the front end surfaces of the front cover body and the upper revolving body body frame to get on and off the front cover body. In constructing the front handrail and the rear handrail on the right edge, the front handrail is bent with its front end bent downward and rearward, with its bent tip biased to the right. A bent part that is bolted to the lower right side of the front cover body at a position slightly higher than the side step, and a position from the bent part to a position higher than the upper step are substantially vertical. A vertical part that extends upward and is fixed to the upper step in a state of being biased to the left side via the bracket, and tilts from the upper end portion of the vertical part to the front, rear, and rear heights to the rear, toward the rear The rear handrail is bent in a substantially inverted U shape, and the lower end is fixed to the rear surface of the front cover body that rises in a step shape of the front cover body. And a front side portion fixed to the rear surface portion of the front cover body through a bracket at a position higher than the fixed position, and the rear end portion of the front handrail fixed to the middle portion of the upper half side, and a lower end of the rear cover. A handrail structure in a construction machine, comprising a rear side portion fitted and fixed to a cylindrical support fixed to the upper surface of the body .

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