JP2021070938A - Hoisting bracket for construction machine - Google Patents

Abstract

To reduce load of attachment work on a truck frame.SOLUTION: A hoisting bracket 20 for a construction machine to be attached on a truck frame 4 of a traveling body is an attachment used in hoisting work of a construction machine provided with: a traveling body; a revolving superstructure arranged on an upper part of the traveling body; and a work machine attached on the revolving superstructure. The hoisting bracket is configured to include a bracket body 21, and a grip 22 rotatably connected to the bracket body 21 via a rotary shaft part. The bracket body 21 comprises: an upper pin hole 21a and a lower pin hole 21b into which connection pins P1, P2 for connecting the bracket body to the truck frame 4 are inserted, respectively; and a hoisting pin hole 21c to which a shackle is attached. The upper surface of the bracket body is formed into a shape to be a slope plane descending from the upper pin hole 21a toward the hoisting pin hole 21c in a state where it is attached on the truck frame 4. The rotary shaft part of the grip 22 is positioned between the centroid of the bracket body and the upper surface.SELECTED DRAWING: Figure 6

Description

The present invention relates to a suspension bracket for a construction machine to be attached to the construction machine when the construction machine such as a hydraulic excavator is suspended by a heavy machine such as a crane.

There are construction machines such as a hydraulic excavator, which includes a crawler type traveling body, a swivel body rotatably installed on the upper part of the traveling body, and a working machine installed on the front part of the swivel body. Some construction machines of this type are provided with a plurality of hanging brackets on the left and right sides of a truck frame, which is a frame of a traveling body (Patent Document 1). According to this configuration, a wire can be hung on the suspension bracket via a shackle, and the construction machine can be completely suspended by a crane, for example, for delivery to the site (Patent Document 1).

Japanese Unexamined Patent Publication No. 2009-20362

However, when the hanging bracket is integrally formed with the truck frame, the truck frame needs to be contained within the vehicle width, so that the wire or shackle hung on the hanging bracket tends to come into contact with the track, for example, when the construction machine is lifted. Therefore, the suspension bracket can be a separate member from the truck frame, and can be attached to the truck frame as an attachment for suspension work when lifting the construction machine. In this case, the hanging bracket can be projected from the vehicle width to make it difficult for the wire or shackle to come into contact with the track, or to weaken the contact pressure between the wire or the like and the track. However, since the suspension bracket requires strength to sufficiently support the suspension load of the construction machine and is inevitably a suitable heavy object, it is necessary to consider the burden on the operator when mounting the suspension bracket on the truck frame.

An object of the present invention is to provide a suspension bracket for a construction machine capable of reducing the burden of mounting work on a truck frame.

In order to achieve the above object, the present invention is an attachment used for suspending a traveling body, a rotating body provided on the upper part of the traveling body, and a construction machine provided with a working machine attached to the rotating body. The suspension bracket for construction machinery to be mounted on the truck frame of the traveling body includes a bracket main body and a handle rotatably connected to the bracket main body via a rotating shaft portion, and is composed of the bracket main body. Has an upper pin hole and a lower pin hole through which a connecting pin with the track frame is passed, and a hanging pin hole for mounting a shackle, and the upper surface is suspended from the upper pin hole in a state of being mounted on the track frame. It has a shape of a slope that descends toward the pin hole, and is characterized in that the rotation shaft portion of the handle is located between the center of gravity of the bracket body and the upper surface.

According to the present invention, it is possible to reduce the burden of mounting the suspension bracket for construction machinery on the truck frame.

Side view of an example of a construction machine to which the suspension bracket for a construction machine according to the embodiment of the present invention is applied. Side view of the suspension bracket for construction machinery according to the embodiment of the present invention. Side view of the suspension bracket for construction machinery according to the embodiment of the present invention. Front view of the suspension bracket for construction machinery as seen from the direction of arrow IV in FIG. Top view of the end of the suspension bracket for construction machinery as seen from the arrow V direction in FIG. Explanatory drawing of work which an operator carries a suspension bracket for a construction machine which concerns on one Embodiment of this invention and attaches it to a hydraulic excavator. The figure which shows the state which attached the suspension bracket for a construction machine which concerns on one Embodiment of this invention to a hydraulic excavator. Explanatory drawing of work that an operator carries a hanging bracket for a construction machine which concerns on a comparative example and attaches it to a hydraulic excavator. The figure which shows the state which attached the suspension bracket for a construction machine which concerns on a comparative example to a hydraulic excavator Explanatory drawing of work required when hoisting a hydraulic excavator using the hanging bracket for construction machinery which concerns on a comparative example.

Embodiments of the present invention will be described below with reference to the drawings.

-Construction machinery-
FIG. 1 is a side view of an example of a construction machine to which a suspension bracket for a construction machine according to an embodiment of the present invention is applied. Hereinafter, the front side (left side in FIG. 1) of the worker who has arrived at the driver's seat will be referred to as the front side of the swivel body. In the figure, the working machine is not shown. The suspension bracket for construction machinery (hereinafter, abbreviated as suspension bracket) according to the present embodiment can be applied to construction machines other than the hydraulic excavator, but FIG. 1 shows a hydraulic excavator as a typical example. The hydraulic excavator shown in these figures includes a traveling body 1, a swivel body 2, and a working machine (not shown).

The traveling body 1 is a basic structure that enables the hydraulic excavator to travel on its own, and is a crawler type. The traveling body 1 includes a truck frame 4, an idler 5, a traveling motor (not shown), a sprocket 7, a track (crawler) 8, and the like. ing. The track frame 4 is formed in an H shape when viewed from above by a center frame 4a and a pair of parallel side frames 4b connected to both left and right sides thereof. An idler 5 is rotatably supported on one end side of the left and right side frames 4b, and a sprocket 7 is rotatably supported on the other end side. An output shaft of a traveling motor (not shown) is connected to the rotating shaft of the sprocket 7 via a speed reducer 6. The traveling motor is a hydraulic motor. A track 8 having an endless track is hung between the idler 5 and the sprocket 7, and the traveling body 1 self-propells by driving the track 8 with the sprocket 7. A plurality of rolling wheels 9 that support the crawler belt 8 from the inner peripheral side are rotatably supported above and below the side frame 4b.

The swivel body 2 includes a swivel frame 10, a driver's cab 11, a counterweight 12, a machine room (engine room) 13, and the like. The swivel frame 10 is a base frame of the swivel body 2, and is provided above the center frame 4a of the track frame 4 via the swivel wheels 14. A swivel motor (not shown) is mounted on the swivel frame 10 in the vicinity of the swivel wheel 14, and the output shaft of the swivel motor meshes with a gear provided on the swivel wheel 14, so that the swivel body 2 with respect to the traveling body 1 Turns. At least one of a hydraulic motor and an electric motor can be used as the swivel motor.

A driver's cab 11 is installed at the front of the swivel frame 10 so as to be located on one side (left side in this example) of the working machine (not shown) in the left-right direction. A machine room 13 covered with a bonnet cover 13a is installed on the rear side of the driver's cab 11 in the swivel frame 10. A counterweight 12 is attached to the rear end of the swivel frame 10. In the machine room 13, there are a prime mover, a hydraulic pump driven by the prime mover, a hydraulic control device such as a control valve for controlling pressure oil from the hydraulic pump to a hydraulic actuator (boom cylinder, etc.), heat exchangers, tanks, and various types. Contains piping and wiring. An electric motor may be used as the prime mover, but an engine (internal combustion engine) is often used. Further, the hydraulic excavator of the present embodiment is a medium-sized machine or a small machine having a smaller vehicle class that can be transported without being disassembled (which can be accommodated in the transportation limit size of a general road).

Although the work machine (not shown) is not shown, it is a general articulated front work device including a work arm and an attachment (work tool such as a bucket). The working arm includes a boom, an arm, a boom cylinder, an arm cylinder and an attachment cylinder. The boom is rotatably connected to the front portion of the swivel body 2 in the vertical direction, the arm is rotatably connected to the tip of the boom, and the attachment is rotatably connected to the tip of the arm. The boom cylinder rotates the boom, the arm cylinder rotates the arm, and the attachment cylinder rotates the work tool within the same vertical plane. The boom cylinder, arm cylinder and attachment cylinder are all hydraulic cylinders.

-Hanging bracket-
Here, brackets 4c are provided at two front and rear positions on the side surfaces of the left and right side frames 4b of the truck frame 4 facing outward in the vehicle width direction. The bracket 4c fits within the vehicle width (on the center frame 4a side of the outer end of the track 8 in the vehicle width direction) (FIG. 6). The bracket 4c is provided with two pin holes arranged one above the other. The suspension bracket 20 according to the present embodiment is an attachment, and is connected to the bracket 4c by two upper and lower connecting pins P1 and P2 when necessary (for example, when the hydraulic excavator is hung in a circle), and the track frame 4 of the hydraulic excavator. It is attached to. The term "round suspension" as used in the present embodiment means that a hydraulic excavator that can be operated as it is is lifted and transported by a heavy machine such as a crane without disassembling work such as removing the work machine.

2 and 3 are side views of the hanging bracket. FIG. 2 shows the posture when the operator carries it, and FIG. 3 shows the posture when the excavator is mounted on the hydraulic excavator. FIG. 4 is a front view of the hanging bracket seen from the direction of arrow IV in FIG. 3, and FIG. 5 is a top view of the end of the hanging bracket seen from the direction of arrow V in FIG. FIG. 6 is an explanatory view of the work in which an operator carries the suspension bracket and attaches it to the hydraulic excavator, and FIG. 7 is a diagram showing a state in which the suspension bracket is attached to the hydraulic excavator.

As shown in FIGS. 1 to 7, the hanging bracket 20 includes a bracket main body 21 and a handle 22. The bracket main body 21 is formed of a thick triangular steel plate, and the bracket main body 21 is provided with an upper pin hole 21a, a lower pin hole 21b, and a hanging pin hole 21c penetrating. In the present embodiment, three bosses 23 penetrate and are fixed to the bracket main body 21, and the through holes of these bosses 23 form an upper pin hole 21a, a lower pin hole 21b, and a hanging pin hole 21c. .. The hanging pin hole 21c is a pin hole into which the shackle pin S2 of the shackle S (FIG. 3) is inserted. The upper pin hole 21a corresponds to the upper pin hole of the bracket 4c of the track frame 4 of the hydraulic excavator, and the lower pin hole 21b corresponds to the lower pin hole of the bracket 4c. The positions of the upper pin hole 21a and the lower pin hole 21b are aligned with the upper and lower pin holes of the bracket 4c, and the connecting pins P1 and P2 (FIG. 6) are passed through the upper pin hole 21a and the lower pin hole 21b to prevent them from coming off. The hanging bracket 20 is attached to the excavator and is firmly fixed. When the suspension bracket 20 is attached to the track frame 4, the suspension pin hole 21c is located outside the vehicle width (outside the track 8 in the left-right direction).

Here, the bracket main body 21 has a shape in which the upper surface 21s is a slope that descends from the upper pin hole 21a toward the hanging pin hole 21c when mounted on the track frame 4 (the state shown in FIG. 3). In the present embodiment, the upper pin hole 21a and the lower pin hole are formed so that the triangle obtained by connecting the centers of the upper pin hole 21a, the lower pin hole 21b and the hanging pin hole 21c to each other forms a substantially right-angled isosceles triangle. An example is shown in which the positional relationship between the 21b and the hanging pin hole 21c is set (FIG. 3). Therefore, when the hanging bracket 20 is mounted on the hydraulic excavator, the upper pin hole 21a is located on the same vertical plane with respect to the lower pin hole 21b, and the hanging pin hole 21c is located on the same horizontal plane, and the upper surface 21s of the bracket body 21 Tilts about 45 degrees. As shown in FIG. 3, the center-to-center distance L1 of the upper pin hole 21a and the hanging pin hole 21c is the center-to-center distance L2 of the upper pin hole 21a and the lower pin hole 21b, and the lower pin hole 21b and the hanging pin hole 21c. It is longer than the center-to-center distance L3.

The handle 22 is rotatably connected to the bracket body 21 via the mounting bracket 26 and the bolt 24. In the present embodiment, the handle 22 is welded and supported by the mounting bracket 26, and the mounting bracket 26 is fixed to the bracket body 21 by bolts 24 and nuts 25 so that the handle 22 is connected to the bracket body 21. Is illustrated. The bolt 24, which is the rotation shaft of the handle 22, is located between the center of gravity G (center of mass) of the bracket body 21 and the upper surface 21s of the bracket body 21 (FIG. 2). In this embodiment, a configuration in which the straight line Lg passing through the center of the bolt 24 and the center of gravity G is orthogonal to the upper surface 21s of the bracket main body 21 is illustrated.

Further, the handle 22 is formed in an annular shape, and as described below, also serves as a stopper for limiting the fall of the shackle S by covering the shackle S attached to the hanging pin hole 21c (FIG. 3). The grip portion 22b of the annular handle 22 is parallel to the bolt 24 in this embodiment. The inner method W1 (FIG. 5) of the arm portions 22c on both sides connecting the welded portion 22a and the grip portion 22b to the mounting bracket 26 of the handle 22 is from the outer method W2 (FIG. 5) of the U-shaped bracket S1 of the shackle S to be used. Is also widely set. Further, the shortest distance La (FIG. 3) from the center of the bolt 24 which is the rotation shaft portion to the grip portion 22b of the handle 22 is set shorter than the distance Lb shown in the figure (La <Lb). The handle 22 is configured to hang on the upper surface 21s to limit the rotation range. The distance Lb is the maximum distance from the outer peripheral surface of the corner of the bracket body 21 where the hanging pin hole 21c is located to the center of the bolt 24. In addition, the distance La is set longer than the shortest distance Lc (FIG. 3) between the center of the shackle pin S2 and the upper surface 21s of the bracket body 21 plus the diameter Ld (FIG. 3) of the tip of the shackle S. There is. As a result, the shackle S can be passed between the upper surface 21s of the bracket body 21 and the grip portion 22b of the handle 22. When the shackle S is connected to the bracket body 21 through the handle 22, the grip portion 22b hangs on the upper surface 21s of the bracket body 21 and stops because La> Lb. As a result, the handle 22 functions as a stopper, and the shackle S is held by the handle 22 and held in an upward standing posture (FIG. 3).

-Slinging method-
The procedure of slinging work using the hanging bracket 20 will be described. First, the operator grasps the grip portion 22b of the handle 22 to lift the hanging bracket 20 and carries it near the hydraulic excavator (FIG. 6). As described above, since the bolt 24, which is the rotation shaft of the handle 22, is located between the center of gravity G of the bracket body 21 and the upper surface 21s, the upper surface 21s of the bracket body 21 is almost horizontal when the handle 22 is lifted. (Fig. 6). When the hanging bracket 20 is carried in front of the upper pin hole 21a as shown in FIG. 6, the upper pin hole 21a advances ahead of the lower pin hole 21b when the upper surface 21s is in a substantially horizontal posture.

After that, the operator adjusts the position of the hanging bracket 20 so that the upper pin hole 21a of the bracket main body 21 overlaps the upper pin hole of the bracket 4c of the track frame 4 coaxially, and the upper pin hole 21a passes through the bracket 4c. Insert the connecting pin P1 into the. Subsequently, the hanging bracket 20 is tilted with respect to the track frame 4 with the upper pin hole 21a as a fulcrum in the direction in which the hanging pin hole 21c descends, and the position of the lower pin hole 21b is aligned with the lower pin hole of the bracket 4c. The connecting pin P2 is inserted into the lower pin hole 21b via the bracket 4c. After inserting the upper and lower connecting pins P1 and P2, nuts are attached to these connecting pins P1 and P2 to firmly fix the hanging bracket 20 to the track frame 4. By repeating the above procedure, a total of four hanging brackets 20 are attached to the front and rear on the left and right sides of the track frame 4.

Next, the U-shaped metal fitting S1 of the shackle S is hung on the wire W suspended from the crane (not shown), and the U-shaped metal fitting S1 is passed through the handle 22 from the track 8 side (upper pin hole 21a side). With the U-shaped bracket S1 passed through the handle 22, align the pin hole of the U-shaped bracket S1 with the hanging pin hole 21c, insert the shackle pin S2 into the U-shaped bracket S1 and the hanging pin hole 21c to prevent it from coming off, and hold the hanging bracket. Attach the shackle S to 20. As a result, the shackle S is held by the handle 22 and held in an upward standing posture (FIG. 7). Similarly, when the shackle S is attached to the other three hanging brackets 20 and the slinging work is completed, a signal is sent to the crane operator after ensuring the safety of the surroundings. This lifts the hydraulic excavator. In some cases, the crane operator himself performs the slinging work.

-Comparative example-
FIG. 8 is an explanatory view of an operation in which an operator carries a suspension bracket for construction machinery according to a comparative example and attaches it to a hydraulic excavator, and FIG. 9 is a diagram showing a state in which the suspension bracket for construction machinery according to a comparative example is attached to the hydraulic excavator. Is. These figures correspond to FIGS. 6 and 7. The hanging bracket X according to the comparative example is an attachment that is attached to and detached from the track frame 4 as in the present embodiment, and has an upper pin hole H1, a lower pin hole H2, and a hanging pin hole H3. The distance between the centers of the upper pin hole H1 and the lower pin hole H2 is L2 (FIG. 3) as in the present embodiment. However, the upper pin hole H1 and the hanging pin hole H3 are provided along the upper surface Xs of the hanging bracket X, and a fixed handle Y is provided on the upper surface Xs. When the handle Y is held, the upper pin hole H1 and the lower pin hole H2 are lifted in a vertically aligned posture. The length of the upper surface Xs (the length in the left-right direction in FIG. 8) cannot be made very long considering the weight of the hanging bracket X, and the distance between the centers of the upper pin hole H1 and the hanging pin hole H3 is the upper pin hole H1. It is assumed that the distance between the centers of the lower pin hole H2 is about the same as L2. In this case, the hanging bracket X is about the same size and weight as the hanging bracket 20 of the present embodiment.

In the hanging bracket X of the comparative example, the length of the upper surface Xs is limited, so that the position of the upper pin hole H1 is close to the handle Y. Therefore, when aligning the upper pin hole of the bracket 4c of the track frame 4 with the upper pin hole H1 of the hanging bracket X, and when inserting the connecting pin P1, the operator takes an unreasonable posture while avoiding the track 8. Must work with. Further, since the shackle S connected to the suspension bracket X attached to the truck frame 4 does not stand on its own, it faces downward before being lifted by the wire W (FIG. 9), and the shackle S is stable in an upward posture when the hydraulic excavator is lifted. The operator must support the wire W until this happens (Fig. 10). Therefore, a plurality of workers who support the wire W are required in addition to the crane operator.

-Effect-
(1) In the case of the hanging bracket 20 of the present embodiment, the bracket main body 21 is formed so that the upper surface 21s is a slope that descends from the upper pin hole 21a toward the hanging pin hole 21c when mounted on the track frame 4. .. In addition, the handle 22 is rotatable, and the bolt 24, which is the rotating shaft of the handle 22, is located between the center of gravity G of the bracket body 21 and the upper surface 21s. Therefore, the upper surface 21s of the suspension bracket 20 of the present embodiment can be secured longer than the upper surface Xs of the suspension bracket X of the comparative example (specifically, only L1-L2 can be longer than the upper surface Xs of the comparative example. ). If the size and weight are similar to those in the comparative example, the distance from the handle 22 to the upper pin hole 21a in the state where the hanging bracket 20 is lifted by using the handle 22 is longer than in the comparative example. As a result, the distance between the handle 22 and the upper pin hole 21a can be increased, and the operator can increase the position of the upper pin hole 21a with respect to the bracket 4c of the track frame 4 and insert the connecting pin P1. The burden can be reduced. Therefore, the burden of mounting the hanging bracket 20 on the track frame 4 can be suppressed.

The suspension bracket 20 can also be used to hang a wire, a chain, or the like when the hydraulic excavator is placed on the loading platform of the trailer and fixed. Further, since the hanging pin hole 21c is located outside the vehicle width when the hanging bracket 20 is attached, interference between the wire W and the crawler belt 8 can be avoided during lifting (or the contact pressure between the wire W and the crawler belt 8 can be suppressed. ).

(2) In addition, by attaching the shackle S to the suspension bracket 20 attached to the hydraulic excavator while passing it through the rotary handle 22, the handle 22 functions as a stopper even when the wire W is loosened. The shackle S can be held in an upward position. As a result, the work of supporting the wire W as described with reference to FIG. 10 can be omitted. Since an operator who supports the wire W is not required when lifting the hydraulic excavator, the minimum number of people required for lifting the hydraulic excavator can be reduced. In addition to the above effect (1), the burden of a series of operations such as attaching the hanging bracket 20 to the track frame 4 and slinging can be further reduced.

1 ... running body, 2 ... swivel body, 4 ... track frame, 20 ... hanging bracket for construction machinery, 21 ... bracket body, 21a ... upper pin hole, 21b ... lower pin hole, 21c ... hanging pin hole, 21s ... top surface, 22 ... Handle, 24 ... Bolt (rotating shaft), G ... Center of gravity, P1, P2 ... Connecting pin, S ... Shackle

Claims (2)

An attachment used for suspending a traveling body, a rotating body provided on the traveling body, and a construction machine provided with a working machine attached to the rotating body, and is used for a construction machine to be attached to a truck frame of the traveling body. In the hanging bracket
It is configured to include a bracket body and a handle rotatably connected to the bracket body via a rotating shaft portion.
The bracket body has an upper pin hole and a lower pin hole through which a connecting pin with the track frame is passed, and a hanging pin hole for mounting a shackle. It has a shape that becomes a slope that descends from the to the hanging pin hole.
A hanging bracket for construction machinery, wherein the rotating shaft portion of the handle is located between the center of gravity of the bracket body and the upper surface. The suspension bracket for construction machinery according to claim 1, wherein the handle is formed in an annular shape and also serves as a stopper for limiting the fall of the shackle by covering the shackle attached to the suspension pin hole. Hanging bracket for construction machinery.

Images