JP2000045333A - Machine body lifting construction for hydraulic excavator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a machine body lifting construction capable of lifting up almost the center portion of a hydraulic excavator with the overall height kept to a low attitude. SOLUTION: Suspending fittings 33 having suspension holes respectively is attached in a freely rotating manner to an outer peripheral portion at the right and left sides of a boss of a boom base portion of a work attachment provided in a freely derricking motion to a vertical bracket board 30 for attaching boom of the upper slewing body 18. Moreover, the suspension fittings is fixed to the side face side of the boom base portion when the fittings 33 is not being used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for lifting a body of a construction machine such as a hydraulic shovel or a working vehicle.

[0002]

2. Description of the Related Art FIG. 9 is a side view showing a lifting state of a hydraulic excavator 1 according to an embodiment described in Japanese Patent Application Laid-Open No. 6-257179. In the excavator 1 shown in FIG. 9, a lifting pin 9 is inserted into a pin hole of a bracket 8 provided on the lower surface of the boom 5, and a lifting excavator lifting ring 10 is fitted to both ends of the lifting pin 9. The wire ropes 2a and 2b are slung over the lifting ring 10 for lifting the hydraulic excavator and the lifting tool 4 provided on the counterweight 7 at the rear part of the upper swing body 6, and the hook 3 of the crane is used.
And the hydraulic excavator is lifted.

[0003] FIG.
FIG. 1 is an overall rear view showing a state in which a body of a backhoe according to an embodiment described in Japanese Unexamined Patent Publication is lifted. In the backhoe shown in FIG. 10, an annular wire sling 23 is locked on a pivot 15 inserted through the upper end of a support 14 disposed on the upper surface of the main boom 11, and a lifting hook 24 such as a crane provided separately is provided. To lift the backhoe.
Reference numeral 12 denotes a sub-boom rotatably supported at the tip of the main boom 11, and reference numeral G 1 denotes a state in which the overhang amount of the excavation work unit 26 connected to the upper swivel 25 of the backhoe is minimized. Backhoe center of gravity (center of gravity position)
It is.

[0004]

In the hydraulic excavator 1 shown in FIG. 9, a lifting pin 9 provided on the lower surface side of the boom 5 is provided.
And a distance L1 between the upper revolving structure 6 and the hanger 4 provided at the rear part thereof.
Is considerably long, so that the length of the wire ropes 2a and 2b becomes very long, and furthermore, the work for slinging requires labor and labor. In addition, the height (height from the ground GL) H1 of the hook 3 must be increased in order to make the safe hanging angle θ of the long wire ropes 2a and 2b less than 60 °. It is difficult to lift the excavator 1 at a work site where there is an obstacle above the excavator 1, for example, in a basement or in a tunnel, which makes the operation very difficult.

In the backhoe shown in FIG. 10, a portion of a pivot 15 inserted into a support 14 provided on the upper surface (back surface) of the main boom 11 is lifted.
Although the length of the wire sling 23 can be set short, it is necessary to minimize the amount of overhang of the excavation work unit 26, so that the height of the upper end a of the excavation work unit 26 (the height from the ground GL) H) When the height of H2 becomes considerably high and there is an obstacle above the backhoe, for example, in a basement or in a tunnel, the backhoe may not be lifted.

SUMMARY OF THE INVENTION An object of the present invention is to provide an airframe lifting structure capable of lifting a central portion of an upper revolving structure of a hydraulic shovel having a low overall height.

[0007]

According to the present invention, a lower traveling body, an upper revolving body rotatably mounted on the lower traveling body, and a boom mounting bracket standing plate of the upper revolving body are raised and lowered. In the hydraulic excavator having the provided work attachment, hanging metal fittings having hanging holes for lifting are respectively provided on outer peripheral portions on both left and right sides of a boss of a boom base of the work attachment.

Accordingly, the position of the suspension fitting provided on the boss of the boom base is above the center of gravity of the hydraulic excavator in a posture in which the work attachment is held in a low state, so that the hydraulic excavator can be lifted in a well-balanced manner. it can. In this case, since the distance between the pair of the hanging brackets is quite short, the wire rope for lifting the body uses a short one, and the hook of another crane for lifting the body can be lowered, and The hanging angle of the wire rope can be reduced to a safe angle of less than 60 °. Therefore, even at a work site where there is an obstacle above the hydraulic excavator, for example, in a basement or in a tunnel, the operation of slinging the wire rope on the hanging bracket can be easily performed, and the hydraulic excavator in a low posture can be stably lifted. .

Further, the hanging fitting has a boss insertion hole, and is rotatably attached to an outer peripheral portion of the boss. Thereby, when lifting the hydraulic excavator, in a side view of the hydraulic excavator, a hook of another crane, a rope center line of a wire rope for lifting, a hanging hole of the hanging bracket,
A line passing through the center of the boss of the boom base becomes a single perpendicular line, and unreasonable tension in the oblique direction does not act on the hanging bracket, so that the safety of the hanging bracket can be ensured.

[0010] Further, the hanging bracket is fixed to the side surface of the boom base when the hanging bracket is not used. This makes it possible to reliably hold the hanging fitting in the housed state when the hanging fitting rotatably attached to the outer peripheral portion of the boss is not used.

Alternatively, the hanging bracket is fixed such that the hanging hole is located above the boss in a state where the boom of the work attachment is raised and lowered substantially horizontally.
Accordingly, when the hydraulic shovel is lifted, the wire rope can be slung on the hanging metal fitting that is always in a protruding state, so that the hydraulic shovel can be stably lifted while keeping the overall height low. It should be noted that even when the hanger is not used, the hanger rotates with the up and down rotation of the boom, so that it is necessary to prevent other interference from the hanger.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a hydraulic excavator 16 equipped with an airframe lifting structure according to a first embodiment of the present invention.
FIG. In the drawing, reference numeral 17 denotes a lower traveling body of a hydraulic excavator 16, 18 denotes an upper revolving body which is rotatably mounted on the lower traveling body 17, 19 denotes a work attachment which is provided on the upper revolving body 18 so as to be able to undulate, and 20 denotes a work. The boom of the attachment 19, 21 is an arm, 22 is a bucket, 27 is a boom cylinder, 28 is an arm cylinder, 29 is a bucket cylinder, the center line 0-0 is the center of rotation of the upper swing body 18, and 13 is the operation of the upper swing body 18. Room.

FIG. 2 is a partially cut-away whole side view showing a state in which the excavator 16 in FIG. 1 is lifted up by a dimension h by another crane (not shown). In the figure,
Reference numeral 30 denotes a bracket standing plate (hereinafter, referred to as a bracket standing plate 30) for mounting the boom 20 formed on a body frame 31 of the upper rotating body 18 (an overall view of the body frame 31 is not shown), and 32 denotes a bracket standing plate. Boom 20 to 30
A boom base pin pivotally supporting the base, 33 is a hanging bracket,
Reference numeral 34 denotes a shackle which is a tool for slinging, 35 denotes a wire rope for slinging, and reference numeral G2 denotes a substantially horizontal state of undulation of the boom 20 (line P connecting the boom base end pin 32 and the boom tip pin 36).
-P denotes a substantially horizontal state), the center of gravity (position of center of gravity) of the excavator 16 held in a posture held at a position, and 37 denotes a hook for lifting another crane (not shown) for lifting the excavator 16. It is. FIG. 3 is an enlarged view of a portion A in FIG.

FIG. 4 is a front view as viewed from FIG. 2B. In order to clarify the slinging state of the wire rope 35, FIG.
The illustration of the base side of the boom 20 is partially omitted. FIG.
FIG. 4 is a cutaway main part perspective view showing the machine body lifting structure of the embodiment in FIG. 3. In the figure, 38 is a boss at the base of the boom 20, 39 is a hanging hole for lifting formed in the hanging bracket 33, and 40 is a female screw for fixing the hanging bracket 33 fixed (by welding) to the side plate 41 of the boom 20. With block, 4
Reference numeral 2 denotes a boom cylinder 27 base mounting bracket.
FIG. 6 is an exploded view of a main part of the machine body lifting structure in FIG. In the drawing, reference numeral 43 denotes a boss 38 insertion hole formed in the hanging bracket 33, reference numeral 44 denotes a fixing bolt, and reference numeral 45 denotes a washer. FIG. 7 is a perspective view of an essential part showing a state in which the hanging bracket 33 is fixed so as to be stored when the hanging bracket 33 in FIG. 5 is not used.

Next, an airframe lifting structure according to a first embodiment of the present invention and its operation will be described with reference to FIGS. In the body lifting structure of the present embodiment, the lower traveling body 17
In the hydraulic excavator 16 having an upper revolving unit 18 rotatably mounted on the lower traveling unit 17 and a work attachment 19 provided on a bracket standing plate 30 of the upper revolving unit 18 so as to be able to move up and down, Hanging brackets 33 having hanging holes 39 for lifting, respectively, on outer peripheral portions (portions indicated by reference numerals B and C in FIG. 6) of bosses 38 (shown in FIGS. 5 to 7) at the base of the boom 20 of the attachment 19. Was provided.

Thus, the boss 3 at the base of the boom 20 is provided.
Since the position of the hanging metal fittings 33 provided at 8 is above the center of gravity G2 of the hydraulic shovel 16 in a posture in which the work attachment 19 is held in a low state as shown in FIG. 2, the hydraulic shovel 16 can be hoisted with good balance. it can. In this case, the distance l between the pair of hanging brackets 33 and 33
(Shown in FIGS. 4 and 5), the wire rope 35 for lifting the fuselage should be short, and the hook 37 of another crane for lifting the fuselage should be lowered to a low height H3 as shown in FIG. And the hanging angle θ ′ of the wire rope 35 can be made less than a safe 60 °. Therefore, even at a work site where there is an obstacle above the excavator 16, for example, underground or in a tunnel, the sling operation of the wire rope 35 on the hanging brackets 33, 33 is easily performed, and the excavator 16 in a low posture is stabilized. Can be lifted.

Further, as shown in FIG. 6, the hanging bracket 33 has a boss insertion hole 43, and is rotatably attached to the outer peripheral portions B and C on both left and right sides of the boss 38. Accordingly, when the hydraulic excavator 16 is hoisted, the hook 37 of another crane and the rope center line (not shown) of another wire crane are hung in a side view (shown in FIGS. 2 and 3) of the hydraulic excavator 16. Hanging hole 39 of fitting 33, boss 38
(Concentric with the axis of the boom base pin 32,
(Indicated by the symbol X in FIG. 1) becomes a single perpendicular line V-V, and no excessive oblique tension acts on the hanging bracket 33, so that the safety of the hanging bracket 33 can be ensured.

Further, the hanging member 33 is provided with the hanging member 3.
7 was fixed to the side plate 41 on the base side of the boom 20 by tightening the stop bolts 44 as shown in FIG. Thereby, when the hanging metal member 33 is not used, the hanging metal member 33 can be reliably held in the housed state.

Next, FIG. 8 is a perspective view of a main part showing the vicinity of a mounting portion of a hanging bracket 33 'in a body lifting structure according to a second embodiment of the present invention. In the drawing, the same reference numerals are given to components using the same components as those in the case of the above-described body lifting structure of the first embodiment. FIGS. 8 and 2 (work attachment 1) show the body lifting structure of the second embodiment.
9 will be described. The difference between the airframe lifting structure of the second embodiment and the airframe lifting structure of the first embodiment is that when the lifting hardware 33 'is not used, the airframe lifting structure is not fixed to the side plate 41 on the base side of the boom 20. Is a point. That is, the hanging bracket 3
3 'is a state in which the boom 20 of the work attachment 19 is raised and lowered substantially horizontally (a line PP connecting the boom base end pin 32 and the boom tip pin 36 is held substantially horizontally as shown in FIG. The arm 21 and the bucket 22 are in a retracted state) (the welding hole 39 'of the hanging bracket 33' is fixed (by welding) so as to be located above the boss 38 at the base of the boom 20. .

Next, the operation of the airframe lifting structure according to the second embodiment will be described. In this embodiment, when lifting a hydraulic excavator (a hydraulic excavator similar to the hydraulic excavator 16), the wire rope (35) is slung against the hanging metal fitting 33 'which is always in a protruding state, and the hydraulic excavator is lifted. It can be stably lifted with the overall height kept low (the same posture as the first embodiment shown in FIG. 2). Even when the hanging bracket 33 'is not used,
Since the hanging bracket 33 'rotates together with the up-and-down rotation of the boom 20, it is necessary to keep other obstacles from interfering with the hanging bracket 33'.

[0021]

According to the lifting structure of the present invention, the lifting attachment is provided on the boom mounting bracket standing plate of the upper swing body of the hydraulic excavator so that the work attachment can be lifted up and down on the outer peripheral portions of the boss of the boom base at both left and right sides. A hanging metal fitting having a hanging hole for use is provided. Since the position of the suspension fitting provided on the boss of the boom base is above the center of gravity of the hydraulic shovel in a posture holding the work attachment in a low state, the hydraulic shovel can be lifted in a well-balanced manner. In this case, since the distance between the pair of the hanging brackets is quite short, the wire rope for lifting the body uses a short one, and the hook of another crane for lifting the body can be lowered, and 60 ° safe hanging angle of the wire rope
Can be less than. Therefore, even at a work site where there is an obstacle above the hydraulic shovel, for example, underground or in a tunnel, the operation of slinging the wire rope on the hanging metal fitting can be easily performed, and the hydraulic shovel in a low posture can be stably lifted.

Further, since the suspension fitting has a boss insertion hole and is rotatably attached to the outer peripheral portion of the boss, when lifting the hydraulic shovel, another crane may be used in a side view of the hydraulic shovel. The hook, the rope center line of the lifting wire rope, the hanging hole of the hanging bracket, and the line passing through the center of the boss of the boom base become one perpendicular line, and no excessive oblique tension acts on the hanging bracket. Thus, the safety of the hanging bracket can be ensured.

Further, the hanging bracket is fixed to the side surface of the boom base when the hanging bracket is not used. Therefore, when the hanging bracket is not used, the hanging bracket is securely held in the housed state. be able to.

Alternatively, the hanging bracket is fixed such that the hanging hole is located above the boss in a state where the boom of the work attachment is raised and lowered substantially horizontally. The hydraulic excavator can be stably lifted while the overall height of the hydraulic excavator is kept low by performing a sling operation on the wire rope with respect to the hanging metal fitting in the protruding state.

[Brief description of the drawings]

FIG. 1 is an overall side view showing a hydraulic excavator equipped with a machine body lifting structure according to a first embodiment of the present invention.

FIG. 2 is a partial cutaway overall side view showing a state where the hydraulic excavator in FIG. 1 is lifted.

FIG. 3 is an enlarged view of a portion A in FIG. 2;

FIG. 4 is a front view as viewed from B in FIG. 2;

FIG. 5 is a perspective view of a cutout main part showing the machine body lifting structure of the embodiment in FIG. 3;

FIG. 6 is an exploded configuration view of a main part of the machine body lifting structure in FIG. 5;

FIG. 7 is a perspective view of a main part showing a storage state of the hanging fitting in FIG. 5;

FIG. 8 is a perspective view of a main part showing an airframe lifting structure according to a second embodiment of the present invention.

FIG. 9 is a side view showing a lifting state of a hydraulic shovel according to one embodiment of the prior art.

FIG. 10 is an overall rear view showing a state in which a body of a backhoe according to an embodiment of the prior art is suspended.

[Explanation of symbols]

 1,16 Hydraulic excavator 2a, 2b, 35 Wire rope 3,24,37 Hook 5,11,20 Boom 6,18,25 Upper swing body 19 Work attachment 30 Boom mounting bracket standing plate 32 Boom base end pin 33,33 'Suspension bracket 36 Boom tip pin 38 Boss 39, 39' Suspension hole 43 Boss insertion hole

Claims (4)

[Claims] 1. A lower traveling body, an upper revolving body pivotally mounted on the lower traveling body, and a work attachment movably provided on a boom mounting bracket standing plate of the upper revolving body. A lifting structure for a hydraulic excavator, comprising: a lifting attachment having lifting holes for lifting on the left and right end outer peripheral portions of a boss of a boom base of the work attachment. 2. The hanging bracket has a boss insertion hole,
The body lifting structure of a hydraulic shovel according to claim 1, wherein the boss is rotatably attached to an outer peripheral portion of the boss. 3. The hydraulic excavator body lifting structure according to claim 1, wherein the hanging metal fitting is fixed to a side surface of the boom base when the hanging metal fitting is not used. 4. The hanging bracket is fixed such that the hanging hole is located above the boss when the boom of the work attachment is raised and lowered substantially horizontally. The lifting structure of the excavator according to the above description.