JP2005194756A - Side guard device for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve body protecting performance of a super structure side guard of a construction machine. <P>SOLUTION: The side guard 10 lower in strength than a super structure platform 9 is formed using material thinner than the plate thickness of the platform 9. A side face of the platform is provided with a side guard mounting bracket 11, and an upper plane part 10a of the side guard is placed over an upper plane part 11a of the side guard mounting bracket and fixed by a bolt 12. The side guard is lower in strength than the platform, and its lower part is not fixed. Consequently, in the case of colliding against an obstacle, the side guard is deformed to effectively absorb impact, thereby reducing a possibility of damaging a super structure. Further, replacement in case of damaging the side guard is easy. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a side guard device for a construction machine, and more particularly, to a side guard device for a construction machine with an improved main body protection function.

  In a construction machine including an upper swing body, there is a risk that the side of the upper swing body may collide with an obstacle around the upper swing body when the upper swing body rotates, thereby damaging the platform of the upper swing body. In order to prevent such damage, a side guard is attached to the side surface of the platform of the upper swing structure. In general, the side guard is an iron part formed in a U-shaped cross section or a mountain-shaped cross section in order to provide a space between the platform and the upper and lower edges are fixed to the platform by welding.

Thus, although the side guard attached by welding cannot be replaced, there is also known one that can be replaced when the side guard is damaged by detaching the side guard (Patent Document 1). This side guard has a U-shaped cross-section and is provided with a female screw boss on the back side of the vertical surface part, a bolt hole is formed in the sewage plane part, and a bolt is screwed into the female screw boss from the inside of the side surface of the frame (platform). Similarly, a bolt is inserted into the bolt hole in the sewage flat surface portion and fixed to the frame.
Japanese Utility Model Publication No. 5-89550

  There is a problem that the side guard welded to the platform is not replaceable and is difficult to repair when damaged. The side guard described in Patent Document 1 has a structure in which the side guard is attached with bolts, so that the side guard can be attached or detached. However, since the female screw boss formed on the vertical surface portion of the side guard is in contact with the side surface of the platform, The external shock applied is directly transmitted to the side of the platform, and the vertical and horizontal surfaces of the side guard are fastened with bolts, so the platform may be deformed or damaged when the side guard collides. There is.

  Therefore, a technical problem to be solved in order to improve the shock absorbing action of the side guard and reduce the possibility of damage to the platform arises, and the present invention aims to solve the above problem.

  The present invention is proposed to achieve the above object, and is a side guard device for protecting the outer surface of an upper swing body platform of a construction machine having an upper swing body, and is an angle type, U type, or mountain type. In a side guard device for a construction machine in which a side guard having a cross-sectional shape such as a mold is mounted on the outer surface of the platform with the convex side facing outward, the side guard is made of the same material or platform thinner than the thickness of the platform. A material having a lower strength than that of the platform is formed using a material lower in strength than the material, and the side guard is fixed to the platform by a coupling means such as a bolt, and the side guard can be attached and detached and replaced. A side guard device for a construction machine is provided.

  By making the strength of the side guard lower than that of the upper swing platform, the shock absorption performance of the side guard is improved, and since it is detachable, the side guard can be deformed or damaged. Exchange is also easy.

  In addition, the side of the construction machine in which one of the upper edge and the lower edge of the side guard is fixed to the platform by a coupling means such as a bolt and the other edge is unsupported to increase the allowable deformation of the side guard. A guard device is provided.

  In this configuration, the allowable deformation amount of the side guard is further increased, and the main body protection performance at the time of collision is further improved.

  In the side guard device of the construction machine according to the present invention, the strength of the side guard that protects the outer surface of the upper swing body platform is lower than the strength of the platform, so that the outer surface of the upper swing body collides with an obstacle. When the side guard is deformed, the side shock is absorbed, and the impact applied to the platform is diminished to reduce the possibility of the platform being deformed or broken. In addition, replacement when the side guard is deformed or damaged is easy.

  In addition, in the configuration in which one of the upper edge and the lower edge of the side guard is fixed to the platform by a coupling means such as a bolt and the other edge is unsupported, the side guard is allowed to be deformed and the side guard is increased. Therefore, even if a strong impact that greatly deforms the side guard is applied, the impact applied to the main body can be effectively absorbed.

  According to the present invention, the strength of the side guard attached to the outer surface of the upper swing body platform of the construction machine is formed to be lower than the strength of the platform, and the side guard is fixed to the platform by a coupling means such as a bolt, By configuring the side guard so that it can be attached and detached, the impact absorbing action of the side guard is improved, thereby reducing the risk of platform damage and deformation.

  FIG. 1 shows a hydraulic power shovel 1 as an example of a construction machine having an upper swing body. The lower traveling body 2 of the hydraulic excavator 1 is provided with a crawler 3, and the upper swing body 4 mounted on the lower traveling body 2 incorporates a power unit (not shown) such as an engine and a hydraulic pump, An arm 6 and a bucket 7 are connected to a boom 5 arranged at the center of the section, and a cab 8 is provided at the left front (right in the figure). Side guards 10 are attached to the left and right sides of the platform 9 that is the base of the power unit, the boom 5 and the cab 8.

  FIG. 2 shows a cross section of the side guard mounting portion of the platform 9. A side guard mounting bracket 11 having an inverted L-shaped cross section is welded to an end of the platform 9 in the width direction, and the side guard 10 is attached to the side guard mounting bracket 11. Is installed. The side guard 10 is a part having a substantially J-shaped cross section, and is formed with a bolt hole that vertically penetrates the upper horizontal surface portion 10a. A female screw hole is formed in the horizontal surface portion 11a at the upper end of the side guard mounting bracket 11. The side guard 10 is fixed to the side guard mounting bracket 11 by placing the bolt hole on the horizontal surface portion 11a, aligning the bolt hole with the female screw hole, inserting the bolt 12 from above, and tightening to the female screw hole. Naturally, when the side guard 10 is damaged, the side guard 10 can be easily replaced by removing the bolts 12.

  The characteristics of the side guard 10 are that the thickness of the side guard 10 is made thinner than that of the side guard mounting bracket 11 or a lower-strength material is used. The strength is set to be lower than the strength of the side guard 10 and the side guard 10 is attached to the side guard mounting bracket 11 at one place on the upper surface.

  As a result, when the side guard 10 collides with an obstacle around the upper revolving body 4 when the side guard 10 collides with the surrounding obstacle, the side guard 10 is elastically deformed at the lower part with the upper bolt tightening point as a fulcrum, and the external force Restores the original shape when removed. Further, when a stronger external force is applied, the side guard 10 is plastically deformed and absorbs the impact as shown in FIG. 3, so that a large load is not applied to the side guard mounting bracket 11 and the platform 9, and the platform 9 Deformation and breakage can be effectively prevented.

  Also, since the side guard 10 is detachable, if the side guard 10 is painted in a different color from the side guard mounting bracket 11 and the platform 9 before mounting, unlike the conventional welded side guard, masking is possible. In addition, there is a secondary advantage that it is not necessary to separate the platform and the side guard.

  Note that the present invention is not limited to the above-described embodiment, and various modifications are possible within the technical scope of the present invention, and the present invention naturally extends to those modified ones.

The perspective view of a hydraulic power shovel. Sectional drawing of the side guard apparatus of this invention. Sectional drawing which shows the side guard apparatus of this invention, and shows the state which the side guard deform | transformed by the collision.

Explanation of symbols

1 Hydraulic excavator
2 Lower traveling body
3 Crawler
4 Upper swing body
9 Platform
10 Side guard
11 Side guard mounting bracket
12 volts

Claims (2)

  A side guard device for protecting the outer surface of an upper swing body platform of a construction machine having an upper swing body, the side guard having a cross-sectional shape such as an angle type, a U shape, or a mountain shape, with the convex side facing outward. In the side guard device of the construction machine attached to the outer side surface of the platform, the side guard is made of the same material thinner than the plate thickness of the platform or a material lower in strength than the platform material, and has a lower strength than the platform. A side guard device for a construction machine, wherein the side guard is formed and fixed to the platform by a coupling means such as a bolt so that the side guard can be attached and detached.   2. The construction according to claim 1, wherein one of the upper edge and the lower edge of the side guard is fixed to the platform by a connecting means such as a bolt, and the other edge is unsupported to increase the deformation tolerance of the side guard. Machine side guard device.

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