JP3557552B2 - Construction machine bottom plate mounting structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bottom plate mounting structure that is removably mounted on a bottom surface of a body of a construction machine.
[0002]
[Prior art]
2. Description of the Related Art A plurality of detachable bottom plates for closing an opening provided on a bottom surface are attached to a bottom surface of a body of a construction machine such as a hydraulic shovel or a bulldozer. For example, an upper revolving structure that is a body of a hydraulic shovel is equipped with various devices and devices such as a cab, an engine, a radiator, a hydraulic pump, a hydraulic control valve, a hydraulic oil tank, and a fuel tank. A plurality of openings are provided on the bottom surface of the upper revolving unit for operations such as mounting, maintenance, and inspection of these devices and devices, and a bottom plate is detachably attached to the opening portions by bolts. I have. The bottom plate can be used to properly protect devices and equipment against obstacles from below the fuselage during earthwork, construction demolition, waste disposal, and rough terrain running of construction machinery. It is formed so as not to be damaged by contact with obstacles or pushing up.
[0003]
A typical example of the above-mentioned bottom plate and its mounting structure will be described with reference to FIG. Bottom plates 46 and 48 are detachably attached to rectangular opening portions 42 and 44 provided on the bottom surface of the body 40, respectively. The bottom plates 46 and 48 are formed in a rectangular shape large enough to cover the opening portions 42 and 44 by a thick steel plate, and bolts 52 are inserted into the screw holes of the bracket 50 of the body 40 through bolt insertion holes formed at the four corners. Is installed. The number of bolts and brackets for attaching the bottom plate is appropriately determined according to the size and shape of the bottom plate, the operating environment of the construction machine, and the like.
[0004]
The bottom plate as described above allows easy opening and closing work so that only the necessary portions of the plurality of opening portions provided on the bottom surface of the fuselage can be opened, and the weight per bottom plate is reduced. In order to be able to perform it, it is divided and attached.
[0005]
[Problems to be solved by the invention]
The conventional construction machine bottom plate mounting structure of the above-described embodiment has the following problems to be solved.
[0006]
(1) Large number of mounting bolts:
The bottom plate must have a rigid mounting structure for that purpose. Therefore, even if one bottom plate is mounted by four bolts, mounting of a plurality of (N) bottom plates requires 4N bolts and a corresponding number of brackets on the fuselage side. Therefore, in order to attach and detach the bottom plate, it is desired to simplify the bottom plate mounting structure in terms of manufacturing costs.
[0007]
(2) It is difficult to attach and detach the bottom plate:
The bottom plate made of plank has a considerable weight. In addition, the attachment / detachment operation is an upward operation while diving into the bottom of the body. Further, the number of bolts to be detached is large. Therefore, since the burden on the operator is large, a mounting structure of the bottom plate that is easy to attach and detach is desired.
[0008]
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described circumstances, and a technical problem of the present invention is to provide a construction in which a mounting structure of a bottom plate mounted on a bottom surface of an airframe is simplified, and an attaching and detaching operation can be easily performed. It is to provide a bottom plate mounting structure for a machine.
[0009]
[Means for Solving the Problems]
According to the invention described in claim 1, adjacent edges of at least a pair of bottom plates detachably attached to the bottom surface of a body of a construction machine are overlapped, and a plurality of bolts are inserted through the overlapped portion. Attached to the fuselage,
An insertion hole for the bolt is formed in a long hole of a bottom plate located at least on the side of the fuselage of the overlapping portion, and one longitudinal end of the long hole is opened at an edge of the bottom plate,
The overlap portion further includes a portion in which only one bottom plate positioned on the side of the fuselage is attached to the fuselage by a bolt, and a cutout portion for allowing the bolt to escape is formed in the other overlapped bottom plate .
A bottom plate mounting structure for a construction machine, characterized in that one of a pair of bottom plates can be attached and detached without removing the other bottom plate .
[0010]
And
(1) The edges of a pair of adjacent bottom plates are overlapped and mounted on the body using a common bolt, thereby reducing the number of bolts and brackets, simplifying the mounting structure, and facilitating the attachment / detachment work.
(2) When the bottom plate is attached to and detached from the body, a part of the heavy bottom plate is held by inserting the open end of the long hole of the bottom plate into a bolt temporarily fastened to the bracket of the body to attach the bolt. Positioning can be easily performed. When removing the bottom plate, the bottom plate can be pulled out and removed if the bolts are loosened.
(3) It is possible to remove the bottom plate stacked on the bottom plate without loosening a part of the mounting bolts of the bottom plate located on the fuselage side.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a bottom plate mounting structure of a construction machine configured according to the present invention will be described in more detail with reference to the accompanying drawings illustrating preferred embodiments of a hydraulic shovel as a typical construction machine.
[0016]
Referring to FIG. 1, a hydraulic excavator generally designated by reference numeral 2 is centered on a lower traveling body 4 and a turning axis 5 extending substantially vertically (extending vertically in FIG. 1) on the lower traveling body 4. And an upper revolving body 6 which is a body that is rotatably mounted. The upper swing body 6 includes various devices and devices such as a cab 8, a working device 10, a hydraulic oil tank 12, a fuel tank 14, and an engine room 16 that houses an engine, a radiator, a hydraulic pump, a hydraulic control valve, and the like. It is installed.
[0017]
Referring to FIG. 2 together with FIG. 1, the bottom surface Z of the upper swing body 6 is provided with a plurality of openings for mounting the above-described devices and devices, and for maintenance and inspection. An under cover as a bottom plate is detachably attached to each of the opening portions. A typical example of the under cover will be described with a pair of under covers 18 and 20 attached to a portion where the hydraulic oil tank 12 and the fuel tank 14 are mounted. The undercovers 18 and 20 are superimposed on each other with their adjacent edges Y (see FIG. 2) superimposed on the undercover 18 on the bottom surface Z side of the body 6 and the undercover 20 on the undercover 18. It is attached to the revolving superstructure 6. The under cover 18 is positioned at the lower opening of the hydraulic oil tank 12, and the under cover 20 is positioned at the lower opening of the fuel tank 14.
[0018]
One undercover 18 will be described with reference to FIGS. The under cover 18 is formed in a substantially square shape by a thick steel plate. The under cover 18 is provided with five bolt insertion holes 22 (indicated by X1, X2, X3, X4, and X5 in FIG. 3), one at each of the four corners, and an edge Y overlapped with the under cover 20. (X5) are formed at intermediate positions (L / 2) of the interval L between the insertion holes X3 and X4. The three insertion holes X3, X4, X5 of the edge Y are formed as long holes, and the ends in the longitudinal direction are opened at the edge of the under cover 18. Two (X1, X2) located on the opposite side of the edge Y of the five insertion holes 22 on one side of the under cover 18 on which the mounting bolts are inserted, and one at the center of the edge Y (X5 Around these three pieces, a bolt guard 24 formed by bending a steel strip into a U-shape is integrally welded to the under cover 18 and attached.
[0019]
The other undercover 20 will be described with reference to FIGS. The under cover 20 is formed of a thick steel plate having substantially the same thickness as that of the under cover 18, and is formed in a square having substantially the same size. The under cover 20 is provided with a total of four bolt insertion holes 22 at four corners (indicated by X6, X7, X8 and X9 in FIG. 5), and two at the edge Y superposed on the under cover 18 (see FIG. 5). X6, X7) are formed at the same interval L as the insertion holes X3 and X4 in the under cover 18. The other two insertion holes X8 and X9 are formed as long holes, and the ends in the longitudinal direction are opened at the edge of the under cover 20. The above-described bolt guard 24 is integrally welded and attached to the under cover 20 around each of the four bolt insertion holes 22 on one side of the under cover 20 on which the mounting bolts are inserted. A rectangular notch 26 having a size that allows the bolt guard 24 to escape is formed at a position (L / 2) corresponding to the insertion hole X5 of the under cover 18 at an intermediate portion between the pair of insertion holes X6 and X7 of the edge Y. Have been. The under cover 20 has a hand for operating a drain cock (not shown) of the fuel tank 14 without removing the under cover 20, and a drain pipe (not shown). The access holes 28a, 28b, 28c are formed so that the holes can be pulled out.
[0020]
With reference to FIG. 7 to FIG. 10, a description will be given first of the mounting portion between the under covers 18 and 20 and the upper swing body 6 formed as described above. On the bottom surface Z (FIG. 2) of the upper swing body 6, at positions (X1, X2, X3-X6, X4-X7, X5, X8, X9) corresponding to the bolt insertion holes 22 of the undercovers 18 and 20, Brackets 30 each having a screw hole are provided. The bracket 30 is formed by welding a nut 30b to a bracket 30a obtained by cutting an angle type steel into a predetermined length, and is integrally welded and attached to a frame member 6a constituting the upper swing body 6. The undercovers 18 and 20 are attached to the upper revolving unit 6 such that the respective edges Y are overlapped, and seven bolts 32 are passed through the respective through holes 22 and screwed into the nuts 30b of the bracket 30 (installation). The procedure is described below).
[0021]
With reference mainly to FIG. 7, a procedure for attaching the under covers 18 and 20 to the upper swing body 6 will be described. Note that the description will be given using the reference numerals X1 to X9 used to identify the arrangement of the above-described insertion holes 22 and the like as the identification numbers of the bolts 32 attached to the locations.
(1) First, the bolts 32 of X8, X9, and X5 are temporarily tightened by providing a space between the head of the bolt 32 and the bracket 30 in the corresponding screw hole of the bracket 30.
(2) Insert the opening of the elongated hole X5 into the space between the head of the bolt X5 and the bracket 30 to hold a part of the weight of the undercover 18. The under cover 18 thus positioned is temporarily fastened by temporarily fastening the bolts X1 and X2 to the bracket 30.
(3) Next, the undercover 20 is inserted into the spaces between the heads of the bolts X8 and X9 and the bracket 30 by inserting the openings of the elongated holes X8 and X9 into a part of the weight of the undercover 20. Hold. The under cover 20 thus positioned is temporarily fastened by temporarily fastening the bolts X3 and X4 to the bracket 30.
(4) Finally, all bolts 32 are fully tightened with a predetermined torque. Thus, the under covers 18 and 20 are attached to the bottom surface Z of the upper swing body 6.
[0022]
Next, the removal of the under covers 18 and 20 from the upper swing body 6 will be described.
(1) When removing only the under cover 18, the bolts X3 and X4 are first loosened and temporarily tightened.
(2) Next, remove the bolts X1, X2 and X5.
(3) Pull out the edge Y of the under cover 18 from between the bracket 30 of the upper swing body 6 and the under cover 20. Thus, only the under cover 18 is removed.
(4) When removing only the under cover 20, the bolts X8 and X9 are first loosened and temporarily tightened.
(5) Next, remove the bolts X6 and X7.
(6) Pull out the under cover 20 from between the head of each of the bolts X8 and X9 and the bracket 30. Thus, only the under cover 20 is removed.
[0023]
The operation of the bottom plate mounting structure for a construction machine as described above will be described.
[0024]
(1) Simplification of bottom plate mounting structure:
As shown in FIG. 7, the undercovers 18 and 20, which are a pair of bottom plates, are arranged with their edges Y overlapped, so that the number of mounting bolts and mounting brackets is smaller than that of the conventional bottom plate mounting structure shown in FIG. Can be reduced. Therefore, the mounting structure of the bottom plate can be simplified.
[0025]
(2) Easy attachment and detachment of the bottom plate:
One part of the mounting bolt insertion hole provided on the bottom plate is a long hole with one end opened at the edge of the bottom plate, so the long hole is inserted in the space between the body and the head of the bolt temporarily tightened on the body. By inserting the opening, a heavy bottom plate can be supported at the time of attachment and detachment, and the attachment of the bottom plate can be easily positioned. Therefore, the burden on the operator can be reduced and the bottom plate can be easily attached and detached.
[0026]
As described above, the present invention has been described in detail based on the embodiments. However, the present invention is not limited to the above-described embodiments. For example, as described below, various modifications or corrections can be made within the scope of the present invention. Can be done.
[0027]
(1) Number of bottom plates:
In the embodiment of the present invention, a pair of bottom plates (under cover) is disclosed, but the number of bottom plates may be plural.
[0028]
(2) Shape of bottom plate:
In the embodiment of the present invention, the under cover serving as the bottom plate is formed in a substantially square shape. .
[0029]
(3) Slot:
In the embodiment of the present invention, the bolt insertion hole of one bottom plate of the overlapped portion is formed as an elongated hole, but the insertion hole of the other bottom plate may be formed as an elongated hole.
[0030]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the bottom board mounting structure of the construction machine comprised according to this invention, the bottom board of the construction machine which simplified the mounting structure of the bottom board attached to the bottom surface of a fuselage, and was able to perform the attachment / detachment work easily. A mounting structure is provided.
[Brief description of the drawings]
FIG. 1 is a side view of a hydraulic excavator as a typical construction machine having a bottom plate mounting structure configured according to the present invention.
FIG. 2 is a partial view of the bottom surface of the upper revolving superstructure, which is an airframe, as viewed in the direction of arrows AA in FIG.
FIG. 3 is an enlarged plan view of one of the pair of bottom plates shown in FIG. 2;
FIG. 4 is a side view as seen in the direction of arrows BB in FIG. 3;
FIG. 5 is an enlarged plan view of the other bottom plate of the pair of bottom plates shown in FIG. 2;
FIG. 6 is a side view as seen in the direction of arrows CC in FIG. 5;
FIG. 7 is an enlarged view of a pair of bottom plates shown in FIG. 2;
FIG. 8 is a sectional view as seen in the direction of arrows DD in FIG. 7;
FIG. 9 is a plan view of the airframe side to which the bottom plate of FIG. 7 is attached.
FIG. 10 is an enlarged view of a portion indicated by E in FIG. 7;
FIG. 11 is a plan view showing a conventional bottom plate mounting structure.
[Explanation of symbols]
2: Hydraulic excavator (construction equipment)
6: Revolving superstructure (airframe)
18: Under cover (bottom plate)
20: Under cover (bottom plate)
22: insertion hole 26: notch 32: bolt Y: edge Z: bottom surface

Claims (1)

Adjacent edges of at least one pair of bottom plates detachably attached to the bottom surface of the body of the construction machine are overlapped, and the overlap portion is attached to the body by inserting a plurality of bolts,
An insertion hole for the bolt is formed in a long hole of a bottom plate located at least on the side of the fuselage of the overlapping portion, and one end in a longitudinal direction of the long hole is opened at an edge of the bottom plate,
The overlap portion further includes a portion in which only one bottom plate positioned on the side of the fuselage is attached to the fuselage by a bolt, and a cutout portion for allowing the bolt to escape is formed in the other overlapped bottom plate .
A bottom plate mounting structure for a construction machine , wherein one of a pair of bottom plates can be attached and detached without removing the other bottom plate .

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