JP2000154561A - Overturning preventing device for construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an overturning preventing device capable of preventing more safely overturning of construction machinery operated by a working machine with the lower running body mounted on a foundation bed and mounted on an upper swivel body. SOLUTION: A guide 6 guiding the travel of respective travel drives 24 from the outside of the respective travel drives 24 is standingly mounted on a foundation bed 1A, and an overturning prevention member 7 protruding to the outside of the guide 6 in a rail form in the traveling direction is mounted on at least the side of guide 6 to be lifted when construction machinery starts overturning. A roughly U-shaped hook member 8 for regulating overturning of beyond a prescribed level by bringing it come into contact therewith from the lower side of the rail-formed overturning prevention member 7 when the construction machinery starts overturning is attached onto the side frame 28 on the side on which the overturning prevention member 7 is protrudingly-mounted. The contact of the overturning prevention member 7 with the hook member is set so as to be vertically upward of the fulcrum of overturning when the construction machinery overturns.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention device for a construction machine such as a hydraulic shovel or a crawler crane having a work machine on an upper revolving structure, and more particularly to a construction for working on a pier or barge. The present invention relates to a machine overturn prevention device.

[0002]

2. Description of the Related Art An example of a construction machine will be described with reference to FIG. 4 showing a state in which a hydraulic shovel is mounted on a barge. Reference numeral 1 denotes a barge, and 1A denotes a base on the barge, which is fixed to a deck so as to cover the range in which the construction machine moves and the work machine works. 1B is a boat body, 2 is a lower traveling body including left and right traveling driving devices 2A and side frames (not shown), 3
Is an upper revolving structure rotatably provided on the upper part of the lower traveling structure 2, and 4 is a working machine mounted on the upper revolving structure 3 so as to be able to move up and down. In FIG.
B is placed so that the traveling direction is parallel to the traveling direction (perpendicular to the paper surface), the work machine 4 is oriented in a direction perpendicular to the traveling direction of the traveling drive device 2A, and shows a state in which the dredging excavation is going to be performed. .

[0003] As shown in this figure, a construction machine is mounted on a barge to perform submarine dredging and excavation work, or is mounted on a wharf such as a harbor or the like and unloads sediment from an earthmoving ship laid on a quay. In order to secure the working range of the work equipment as large as possible, place the lower traveling body parallel to the berth or quay of the barge and travel along the berth or quay of the barge. Often be able to do it. But,
The mounting contact length of the traveling drive device of the lower traveling body of this type of construction machine is generally long in the traveling direction, so that stability in that direction is good, but the contact length in the direction perpendicular to the traveling direction is short. Therefore, stability against falling is bad. However, the dredging excavation is performed in a state in which such a large load is directed, that is, in a state where the upper swing body 3 is turned by approximately 90 °.

As an example of a device for preventing this overturning, Japanese Utility Model Laid-Open No. 2-37960 is cited. 2-37
No. 960 discloses that a track frame (corresponding to a side frame in the present invention) is provided with an L
The L-shaped side frame is protruded so as to extend to the outside of the crawler belt, and the inverted L-shaped rail that engages with the L-shaped side frame for a predetermined distance of travel of the construction machine is lifted by a lifting ship (corresponding to a barge). An overturn prevention device is disclosed which is provided on the upper side and is movable in the traveling direction of the undercarriage and prevents overturn.

[0005]

SUMMARY OF THE INVENTION
The prior art disclosed in Japanese Patent Application Publication No. 60-26060 discloses an L-shaped side frame provided on a track frame of a lower traveling body of a construction machine and an inverted L provided on a road surface in a traveling direction of the construction machine.
The structure is such that the lower surface of the horizontal section of the U-shaped rail is brought into contact with the rail to prevent the construction machine from rising more than a predetermined amount when the construction machine starts to fall, thereby preventing the construction machine from falling. This prior art will be described with reference to FIG. 5, which schematically shows a state in which a construction machine falls down. 1A is a base on the barge on which the construction machine is mounted, 80 is an inverted L-shaped rail fixed to the base 1A, 80A is a horizontal lower surface of the rail 80, and 80B is a vertical part. Reference numeral 60 denotes an L-shaped side frame. The L-shaped side frame 60 is fixed to the track frame 20A (corresponding to a side frame in the present invention).
It is a horizontal part upper surface of the character-shaped side frame 60. Reference numeral 20B denotes a crawler belt, 20C denotes a track link, and both are fixed by bolts (not shown). Reference numeral 20D denotes a roller, and a contact portion between the roller 20D and the track link 20C is 2D.
Shown by 0E.

Here, when the construction machine falls over, the contact portion 20E on the left side in this figure becomes a fall fulcrum, and the contact portion 20E on the right side shown in FIG. In the figure, the imaginary line shows a state in which the horizontal line upper surface 60A of the L-shaped side frame is in contact with the horizontal portion lower surface 80A of the rail 80 to restrict the fall by displacing in the falling direction. Also,
Reference numeral 50A denotes a soleplate placed on the traveling path on the base 1A, which can be appropriately provided as a shock absorbing material for a contact surface between the base 1A and the crawler belt 20B or to prevent abrasion of the contact surface.

As shown by the phantom line in FIG. 5, when the construction machine starts to fall, the horizontal upper surface 60A of the L-shaped side frame 60 comes into contact with the horizontal lower surface 80A of the rail 80. As a result, each of them bends and deforms in the directions of arrows X and Y due to the falling load. The amount of flexural deformation increases in proportion to the magnitude of the overturning load.
0A and the horizontal portion lower surface 80A bend and deform in a direction to separate from each other. Further, since the contact portion is located above the falling fulcrum 20E in the vertical direction, the construction machine to which the L-shaped side frame 60 is attached also floats by moving in an arc around the falling fulcrum (not shown). It moves in the direction of the arrow Z to move away from the contact portion 80.

Here, the strength of the lower surface 80A of the horizontal portion of the rail 80 is higher as it is closer to the root portion, that is, the portion connected to the vertical portion 80B, and it is easy to bend and deform toward the tip end. From this, when the construction machine falls down, the horizontal portion upper surface 60 of the L-shaped side frame 60 is
The movement of A in the direction away from the horizontal portion lower surface 80A causes the rail 80 to be deformed in such a direction that the horizontal portion lower surface 80A is more flexibly deformed, that is, the horizontal portion lower surface 80A is turned up. In addition, since the construction machine travels along the rail 80 when changing the work place, the end 60B of the L-shaped side frame 60 and the vertical portion 8 of the rail 80 are moved.
I have to leave an adequate space between the 0B inner surface,
Since the distance between the horizontal portion upper surface 60A and the horizontal portion lower surface 80A and the length of their contact surfaces are also limited, the contact portion of the L-shaped side frame 60 to the rail 80 is formed by the tip of the horizontal portion lower surface 80A. There is a problem that the contact portion is likely to be separated, for example, when a sudden and large overturning load is applied.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a safer fall prevention device for a self-propelled construction machine.

[0010]

SUMMARY OF THE INVENTION Accordingly, the present invention is directed to a lower portion having a base, left and right traveling driving devices mounted on the base, and left and right side frames respectively supporting the traveling driving devices. In an overturning device for a construction machine having a traveling body, an upper revolving body pivotally supported on the lower traveling body, and a work implement mounted on the revolving body, the traveling of each traveling drive device is performed on the base. A guide that guides from the outside of each traveling drive device is erected, and at least the guide on the side that floats when the construction machine starts to fall is provided with a fall prevention member projecting like a rail in the traveling direction outside the guide. On the side frame on which the overturn prevention member is protruded, when the construction machine starts overturning, in order to contact the underside of the overturn prevention member from below and regulate overturning by a predetermined amount or more,
The object is achieved by attaching a hook member which is arranged in a substantially horizontal state at a position below the overturn preventing member and separated by a predetermined dimension.

Further, it is desirable that the hook member is structured to be attached to the side frame by bolts, and that the attachment position is changed up and down.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described.
This will be described with reference to FIGS. Note that the same components as those used in the description of the related art are denoted by the same reference numerals, and description thereof is omitted.

FIG. 1 shows a hydraulic excavator as a construction machine mounted on a base of a barge. The work machine is not shown.
FIG. 2 is an explanatory view schematically showing a state in which the right side portion of FIG. 1 is enlarged and falls down. When the solid line is stable and the imaginary line is when the hydraulic excavator tries to fall down, the overturn prevention device of the present invention is shown. Indicates a state in which the fall is regulated by. FIG. 3 is FIG.
FIG.

In these figures, reference numeral 1 denotes a barge, 1A denotes a base on the barge on which a hydraulic shovel is mounted, 2 denotes a lower traveling body of the hydraulic shovel, and includes left and right traveling drive units 2A, side frames 2B and the like. You. The working machine provided on the upper swing body 3 is omitted. 50A is a floor plate on the base, 6 is a guide erected on the base 1A, and is fixed to the base 1A by welding or other appropriate means by welding or the like, and serves as a guide when the lower traveling body 2 travels in a direction perpendicular to the paper surface. Has functions.
That is, the operator can use the guide 6 as a guide to allow the hydraulic excavator to enter the floor plate, and can run the hydraulic excavator so that the hydraulic excavator is always arranged at a substantially predetermined position on the floor plate 50A. Further, at least the guide 6 on the side (right side in FIG. 1) on which the construction machine floats when it falls down is fixed to the guide 6 in the form of a substantially horizontal rail in the direction perpendicular to the paper surface by welding or the like. You. Reference numeral 7B denotes a reinforcing member for the fall prevention member 7, which is provided between the lower surface 7A of the fall prevention member 7 and the base 1A, and whose upper and lower joints are fixed by welding or the like. However, the reinforcing member 7B may not be provided as long as the strength of the lower surface 7A, which is the contact portion of the fall prevention member 7 with the hook member 8 described later, is ensured. Note that an appropriate space required for traveling movement is provided between the guide 6 and the outer end surfaces of the left and right traveling driving devices 2A.

Numeral 8 denotes a substantially U-shaped hook member having a contact portion upper surface 8A which comes into contact with the lower surface 7A of the overturn preventing member 7 when the construction machine tries to overturn. It extends substantially horizontally below the member 7 at a predetermined interval. The hook member 8 is fixed to the outer side surface of the side frame 2B with a bolt 9. In FIG. 2, a link 20C and a roller 20D of the traveling drive device 2A are shown.
The contact surface 20E is a portion that falls on the left side when falling down, and a portion that floats away from the link 20B on the right side. Reference numeral 20E 'denotes a horizontal line of the contact surface 20E, and the contact position between the lower surface 7A of the fall prevention member 7 and the upper surface 8A of the contact portion of the hook member 8 (that is, the vertical position of the lower surface 7A) is provided above the horizontal line 20E'. ing.

In FIG. 3, the hook members 8 are shown in a side view, but the hook members 8 are fixed to the side frame 2B by bolts 9 in an appropriate number (eight in this figure). Further, a seat plate 2B 'is provided at a mounting portion of the hook member 8 of the side frame 2B, and an appropriate female screw hole (four in this figure) is provided on the seat plate 2B' so that the hook member 8 can be moved up and down. Are provided as spares, so that the mounting position of the hook member 8 can be changed. In order to prevent damage to the spare screw holes, bolts 9 'are attached to them and are replaced when the positions are changed. It should be noted that the seat plate 2B 'can be directly attached to the side frame 2B without providing the seat plate 2B'. Two or more hook members 8 may be provided at appropriate positions on the side frame 2B.

The operation of the overturn prevention device for a construction machine constructed as described above will now be described. In FIG. 1, when the excavator falls down, the left link 20C and the roller 2
The contact surface 20E with 0D serves as a fall fulcrum, and a portion above the right contact surface 20E floats. Therefore, the hook member 8 attached to the side frame also floats. Then, as shown by a dotted line in FIG.
A contacts the upper surface 8A of the contact portion of the hook member 8 to restrict further overturning. To acts tipping load in this case the contact portions, the lower surface 7A of the fall prevention member 7 in the arrow X ₂ direction, the contact portion of the hook member 8 move away from one another the contact portion to flexibly deformed in the arrow Y ₂ direction You will be in a state to do.

However, since the contact surface is above the horizontal line 20E 'of the fulcrum 20E, the hook member 8 that floats moves in the direction of arrow Z. Therefore, the movement of the contact portion between the lower surface 7A and the contact portion upper surface 8A described above is moved so that the movement in the direction of the arrow Z just cancels out.
It becomes difficult for the contact portion to separate even when a sudden and large overturning load is applied. That is, the contact part upper surface 8 of the hook member 8
A comes into contact with the lower surface 7A of the fall prevention member 7, and a force acts in a direction to deform the fall prevention member 7.
Is displaced in a direction following the direction in which the overturn preventing member 7 is deformed, so that the overturning load can be received by the overturn preventing member 7 more effectively.

Here, as the distance between the upper surface 8A of the contact portion of the hook member 8 and the lower surface 7A of the tipping prevention member 7 contacting becomes larger, those contacting portions become stronger of the tipping prevention member 7. From approaching the connection to the high guide 6,
The risk of the contact part separating further decreases. Since the position where the hook member 8 is attached to the side frame can be changed, for example, the floor plate 50A and the crawler belt 20 are attached.
When the contact portion with B or the contact portion between the fall prevention member 7 and the hook member 8 is worn, or the movement from when the operator starts to fall to when the fall is restricted can be adjusted to a position where the user feels comfortable. .

As described above, by arranging the fall prevention member 7 outward and the hook member 8 inward, the ability of the fall prevention member 7 to receive a load at the time of overturn regulation is enhanced. Therefore, the rigidity of the fall prevention member 7 can be reduced. Therefore, the overturn prevention member 7 can be formed of a thin plate, and can be configured to have a box-like and flexible structure by providing the reinforcing member 7B. As a result, when the hook member 8 collides with the tipping prevention member 7, the tipping prevention member 7 is elastically deformed to some extent, thereby absorbing the impact.

In the above embodiment, the overturning direction was described as one side. However, in the case where the earth transport vessel is placed on both sides of the barge and the earth is unloaded from either side, the opposite side in FIG. Also, a fall prevention device may be provided. Further, if the deck or wharf of the barge on which the construction machine is mounted is sufficiently strong, it may be used as a base.

[0022]

According to the present invention, a rail-shaped fall prevention member protruding in a direction away from a fall fulcrum is provided so as to hold the fall prevention member with a hook member provided on a side frame in a substantially U-shape. In this case, the lower surface of the fall prevention member comes into contact with the upper surface of the contact portion of the hook member so as to restrict the fall, so that when the two members bend due to the contact load at the time of fall, the contact portions are deformed in a direction away from each other. However, the direction in which the hook member moves due to overturning moves in a direction that offsets the fact that the hook members move away from each other due to the bending deformation of the contact portion. Therefore, even when a sudden and large overturning load is applied, it is difficult for the contact portion to separate, and there is an effect that safety against overturning is secured.

[0023]

[Brief description of the drawings]

FIG. 1, showing an embodiment of the present invention, is an external view of a state in which a hydraulic shovel is mounted on a base of a barge, and is a view in which a working machine is omitted.

FIG. 2 is an explanatory diagram schematically showing a state in which the right side of FIG. 1 is enlarged and falls down.

FIG. 3 is a right side view of FIG. 2;

FIG. 4 is an explanatory view showing a state in which a hydraulic excavator is mounted on a barge and works with a working machine in the prior art.

FIG. 5 schematically shows a state when a construction machine falls over in the prior art.

[Explanation of symbols]

 Reference Signs List 1A Base 2 Lower traveling body 2A Traveling driving device 2B Side frame 20E 'Falling fulcrum horizontal line 6 Guide 7 Fall prevention member 7A Lower side of fall prevention member 8 Hook member 8A Contact part upper surface of hook member 8 9 Bolt

Claims (2)

[Claims] 1. A lower traveling body having a base, left and right traveling driving devices mounted on the base, and left and right side frames respectively supporting the traveling driving devices, and turning on the lower traveling body. An upper revolving body movably supported and a fall prevention device for a construction machine having a work implement mounted on the revolving superstructure, a guide for guiding the traveling of the traveling drive units on the base from outside the traveling drive units. And the guide on the side that rises at least when the construction machine starts to fall,
An overturn prevention member is provided which projects substantially horizontally toward the outside of the guide, and the side frame on which the overturn prevention member protrudes is provided below the overturn prevention member when the construction machine starts to overturn. In order to regulate the fall of more than a predetermined by contact from the side,
A fall prevention device for a construction machine, characterized in that a hook member which is spaced downward by a predetermined dimension from the fall prevention member and is disposed in a substantially horizontal state is attached. 2. The construction machine according to claim 1, wherein the hook member is formed in a substantially U-shape, and a mounting position of the hook member on the side frame can be adjusted vertically by a bolt. Fall prevention device.