JP2023023089A - Construction machine and raising link - Google Patents

Abstract

To provide a construction machine capable of easily suppressing interference between a backstop and a winch.SOLUTION: A construction machine includes a revolving superstructure, a boom mounted on the revolving superstructure to be raised and lowered, a backstop provided to be rotatable with respect to the revolving superstructure to prevent the boom from being titled toward a rear side of the boom by supporting the boom from the rear side, and a winch mounted on the revolving superstructure between the boom and the backstop. The revolving superstructure includes a connection part with a first support hole into which a rotation shaft rotatably connected with the backstop is inserted. A raising link which can be fixed to the connection part is further included. The raising link has a second support hole into which the rotation shaft is inserted from an upper part than the first support hole.SELECTED DRAWING: Figure 2

Description

The present invention relates to construction machinery and lifting links.

A construction machine is known that includes an upper swing structure and a boom that is hoistably attached to the upper swing structure. A wire rope is normally suspended from the tip of the boom, and a hook or the like is attached to the wire rope. This wire rope is configured to be hoisted by a winch mounted on the upper revolving body (see Patent Document 1).

This construction machine has a backstop for preventing the boom from collapsing to the back side. The backstop is rotatably disposed on the upper rotating structure to support the boom from the dorsal side.

JP 2005-298088 A

From the viewpoint of safety, etc., the boom is held in a state where it lays down from the ventral side when the aircraft is parked. At this time, depending on the specifications of the construction machine, etc., the boom may have a large lodging angle, and the backstop may interfere with the winch when lodged in accordance with the boom.

In view of such inconveniences, today, the tip of the boom is supported by a pedestal to prevent the boom from increasing its lodging angle. However, this configuration may cause the boom to unintentionally fall off the cradle. In addition, according to this configuration, it is necessary to install a pedestal each time the boom is lowered, resulting in poor work efficiency.

SUMMARY OF THE INVENTION In view of the above inconvenience, an object of the present invention is to provide a construction machine capable of easily suppressing interference between the backstop and the winch.

A construction machine according to an aspect of the present invention includes an upper swing body, a boom attached to the upper swing body so that it can be raised and lowered, and a boom rotatably provided with respect to the upper swing body. A backstop that supports the boom to prevent it from collapsing toward the back side, and a winch that is mounted on the upper rotating body between the boom and the backstop. , a construction machine having a connecting portion having a first support hole into which a rotating shaft capable of rotatably connecting the backstop is inserted, the construction machine further comprising a raising link fixable to the connecting portion, The raising link has a second support hole above the first support hole and into which the rotating shaft is inserted.

A construction machine according to an aspect of the present invention can easily suppress interference between the backstop and the winch.

FIG. 1 is a schematic side view showing a construction machine according to one embodiment of the invention. FIG. 2 is a schematic partially enlarged view showing a connecting portion between an upper revolving body and a backstop of the construction machine of FIG. 1. FIG. 3 is a schematic side view showing a raising link arranged on the construction machine of FIG. 1. FIG. FIG. 4 is a schematic partial side view showing a state in which the boom of the construction machine in FIG. 1 is raised. FIG. 5 is a schematic side view showing a conventional construction machine. FIG. 6 is a schematic partially enlarged view showing a connecting portion between the upper revolving body and the backstop of the construction machine of FIG.

[Description of the embodiment of the present invention]
First, embodiments of the present invention will be listed and described.

A construction machine according to an aspect of the present invention includes an upper swing body, a boom attached to the upper swing body so that it can be raised and lowered, and a boom rotatably provided with respect to the upper swing body. A backstop that supports the boom to prevent it from collapsing toward the back side, and a winch that is mounted on the upper rotating body between the boom and the backstop. , a construction machine having a connecting portion having a first support hole into which a rotating shaft capable of rotatably connecting the backstop is inserted, the construction machine further comprising a raising link fixable to the connecting portion, The raising link has a second support hole above the first support hole and into which the rotating shaft is inserted.

Since the construction machine has the second support hole above the first support hole provided in the connecting portion and into which the rotating shaft is inserted, the rotation center of the backstop can be shifted upward. As a result, the construction machine can easily suppress interference between the backstop and the winch even when the boom is lowered from the ventral side.

The construction machine may further include a strut that supports the upper revolving body from below. In a high-post construction machine equipped with a strut that supports the upper rotating body from below, when the boom is lowered from the ventral side, the rotation angle of the backstop increases, and the backstop and the winch come closer to each other. easier to do. Even with such a configuration, the construction machine can more easily suppress interference between the backstop and the winch.

The raising link may have a fixing hole arranged so as to overlap the first support hole and fixed to the connecting portion. In this way, the raising link is arranged so as to overlap the first support hole, and has a fixing hole fixed to the connecting portion, so that the second support hole is positioned above the first support hole. can be placed more easily.

A raising link according to another aspect of the present invention is a first support into which a rotation shaft is inserted and which can rotatably connect a backstop that supports the boom from the back side to prevent the boom from collapsing toward the back side. A second support hole configured to be fixable to the connecting portion of the upper revolving body having a hole and into which the rotating shaft can be inserted above the first support hole is provided.

Since the raising link has the second support hole into which the rotating shaft can be inserted above the first support hole, the center of rotation of the backstop can be shifted upward. Therefore, by fixing the raising link to the connecting portion, interference between the backstop and the winch can be easily suppressed even when the boom is lowered from the ventral side.

In the present invention, the "back side" of the boom means the side on which the boom is laid down. "Upper" means above when the construction machine is arranged on a horizontal plane, and "lower" means below when the construction machine is arranged on a horizontal plane.

[Details of the embodiment of the present invention]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

<Construction machinery>
A construction machine 10 shown in FIGS. 1 and 2 includes an upper revolving body 1, a boom 2 attached to the upper revolving body 1 so as to be able to rise and fall, and a boom 2 which is rotatably provided with respect to the upper revolving body 1. A backstop 3 for preventing the boom 2 from falling down to the backside by supporting it from the backside and a winch 4 mounted on the upper revolving body 1 between the boom 2 and the backstop 3 are provided. The construction machine 10 also includes a support 5 that supports the upper revolving body 1 from below, and a lower running body 6 that supports the support 5 from below. The construction machine 10 is a so-called high-post type construction machine in which the upper revolving body 1 is mounted on the lower traveling body 6 via the struts 5 .

(lower running body)
The undercarriage 6 is configured to be self-propelled. The undercarriage 6 has a pair of crawler units 6a arranged to face each other in the vehicle width direction, and a car body (not shown) connected to the pair of crawler units 6a.

(pillar)
The strut 5 is mounted on the car body so that the central axis extends vertically. The strut 5 is interposed between the upper revolving body 1 and the lower traveling body 6 so that the upper revolving body 1 is positioned at a higher level than the plane on which the construction machine 10 is arranged. A bearing (not shown) is arranged at the upper end of the column 5 to hold the upper revolving body 1 so that it can revolve.

(Upper revolving body)
The upper revolving body 1 has a revolving frame 11 arranged so as to be able to revolve with respect to the column 5 and a connecting portion 12 fixed to the revolving frame 11 . The connection part 12 may be configured integrally with the revolving frame 11 so as to constitute a part of the revolving frame 11 or may be separately attached to the revolving frame 11 . The connecting portion 12 is, for example, plate-shaped, and more specifically, has a flange-like shape that protrudes upward and extends in the front-rear direction. As shown in FIG. 2 , a raising link 20 is fixed to the connecting portion 12 . Raising link 20 is itself an embodiment of the present invention. The raising link 20 is detachably fixed to the connecting portion 12 . That is, the raising link 20 is fixed to an existing construction machine having the connecting portion 12 as a retrofit. Before describing the construction machine 10 to which the raising link 20 is fixed, the existing construction machine 100 to which the raising link 20 is not fixed is first described with reference to FIGS. 5 and 6. FIG.

As shown in FIG. 6, the connecting portion 12 has a first support hole 12a into which a rotating shaft 30 capable of rotatably connecting the backstop 3 is inserted. The construction machine 100 of FIG. 6 does not have the raising link 20, and the backstop 3 is directly connected to the connecting portion 12 via the rotating shaft 30. As shown in FIG. In this construction machine 100, when the boom 2 is lowered from the ventral side when the machine is parked, the backstop 3 is also lowered along with the boom 2. - 特許庁On the other hand, in this existing construction machine 100, the center of rotation of the backstop 3 is restricted by the first support hole 12a, so the center of rotation of the backstop 3 cannot be set sufficiently high. As a result, in this construction machine 100, the backstop 3 and the winch 4 interfere with each other when the boom 2 falls down (that is, when the rotation angle of the backstop 3 increases). Therefore, as shown in FIG. 5, the construction machine 100 supports the tip portion of the boom 2 on a cradle X when the boom 2 is laid down, and controls the tilting angle of the boom 2 to be below a certain level. However, according to this configuration, the boom 2 may fall off the cradle X if the cradle X is unbalanced, for example, in a strong wind environment.

On the other hand, as shown in FIG. 2 , the construction machine 10 has a raising link 20 that can be fixed to the connecting portion 12 . The raising link 20 also has a second support hole 21 above the first support hole 12 a provided in the connecting portion 12 and into which the rotating shaft 30 is inserted. Therefore, the construction machine 10 can shift the center of rotation of the backstop 3 upward as compared with the existing construction machine 100 . Hereinafter, the raising link 20 will be described in detail with reference to FIGS. 1 to 3. FIG.

As shown in FIGS. 2 and 3, the raising link 20 includes a plate-shaped bracket 20a, more specifically, the bracket 20a. The raising link 20 has a first fixing hole 22 that is arranged so as to overlap the first support hole 12 a and is fixed to the connecting portion 12 . The first fixing hole 22 is arranged below the second support hole 21 so that the second support hole 21 can be positioned higher than the first support hole 12a. The first fixing hole 22 may be an opening formed in the bracket 20a or a notch formed in the bracket 20a. The first shaft member 31 is inserted into the first support hole 12a and the first fixing hole 22 while overlapping each other. A retainer (not shown) is connected to the first shaft member 31 to prevent it from coming off from the first support hole 12 a and the first fixing hole 22 . Examples of the retainer include, but are not limited to, a pin, nut, and the like. The raising link 20 is fixed to the connecting portion 12 in a state in which the first fixing hole 22 and the first support hole 12a overlap, so that the second support hole 21 can be easily positioned above the first support hole 12a. can be placed.

Further, the raising link 20 has a second fixing hole 23 which is arranged so as to overlap with the connecting hole 12 b for mounting the gantry provided in the connecting portion 12 and fixed to the connecting portion 12 . The second fixing hole 23 may be an opening formed in the bracket 20a or a notch formed in the bracket 20a. The second shaft member 32 is inserted into the connecting hole 12b and the second fixing hole 23 while overlapping each other. As the second shaft member 32, for example, a shaft member for connecting the gantry 7 to the connecting portion 12 can be used. The raising link 20 has the first fixing hole 22 connected to the first support hole 12a via the first shaft member 31, and the second fixing hole 23 connected to the connecting hole 12b via the second shaft member 32. By doing so, it is fixed to the connecting portion 12 .

The raising link 20 has a convex portion 24 that protrudes upward while being fixed to the connecting portion 12 . The second support hole 21 is arranged in the convex portion 24 . Since the second support hole 21 is arranged on the convex portion 24 , the center of rotation of the backstop 3 can be effectively shifted upward. Further, since the second support hole 21 is arranged in the convex portion 24, interference between the backstop 3 and the bracket 20a can be suppressed when the backstop 3 rotates.

The center-to-center distance between the second support hole 21 and the first fixing hole 22 is preferably smaller than the center-to-center distance between the second support hole 21 and the second fixing hole 23 . The raising link 20 can bring the center of rotation of the backstop 3 closer to the winch 4 by reducing the center-to-center distance between the second support hole 21 and the first fixing hole 22 . As a result, the center of rotation of the backstop 3 is shifted upward, and interference between the backstop 3 and the winch 4 can be easily suppressed.

The second support hole 21 is formed so that the backstop 3 and the winch 4 interfere with each other when the construction machine 10 is placed on a horizontal plane and the boom 2 is lowered from the ventral side with respect to the horizontal plane (the state shown in FIG. 1). It is preferably formed at a position where it does not.

(boom)
The boom 2 controls the suspension position of the hook during crane work. During crane operation, a wire rope (not shown) is stretched over the boom 2 along its longitudinal direction. This wire rope is suspended from the tip of the boom 2 . A hook (not shown) is attached to the portion of the wire rope that hangs down from the boom 2 .

(backstop)
As shown in FIG. 4 , the backstop 3 includes an inner cylinder 25 , a coil-shaped buffer spring 26 arranged on the outer peripheral surface of the inner cylinder 25 , and a coil-shaped buffer spring 26 that is above the buffer spring 26 so as to be slidable on the inner cylinder 25 . It has an outer cylinder 27 that is wrapped around. At the lower end of the inner cylinder 25, a spring seat 25a that supports the buffer spring 26 and a first connecting piece 25b projecting downward from the spring seat 25a are provided. A first connecting hole into which the rotating shaft 30 is inserted is formed in the first connecting piece 25b. A second connecting piece 27 a is provided at the upper end of the outer cylinder 27 to be rotatably connected to the dorsal side of the boom 2 . A second connecting hole is formed in the second connecting piece 27a.

The backstop 3 is connected to the first support hole 12a provided in the connecting portion 12 via the rotating shaft 30 (arranged in the existing construction machine 100). The compression start angle of the shock absorber spring 26 (the falling angle of the boom 2 at which the shock absorber spring 26 starts compressing) is set to be the same as in the state where it is connected to the 2 support hole 21 via the rotating shaft 30 . More specifically, as shown in FIG. 6, when the backstop 3 is connected to the first support hole 12a, a spacer 28 is arranged on the side of the spring seat 25a that contacts the buffer spring. On the other hand, as shown in FIGS. 2 and 4, the spacer 28 is removed when the backstop 3 is connected to the second support hole 21 . Thereby, in the backstop 3, the change in height of the buffer spring 26 caused by the raising link 20 is offset by removing the spacer 28. As shown in FIG. As a result, the backstop 3 is adjusted so that the compression start angle of the buffer spring 26 does not change between the state of being connected to the first support hole 12a and the state of being connected to the second support hole 21. there is

(winch)
The winch 4 is a hoisting winch capable of hoisting a wire rope stretched over the boom 2, for example. The winch 4 has a winch drum and a drive source for winding up the wire rope. The drive source includes, for example, a hydraulic motor and a speed reducer. The winch 4 is arranged on the rotation track of the backstop 3 .

<Advantages>
Since the construction machine 10 has the second support hole 21 into which the rotary shaft 30 is inserted above the first support hole 12a provided in the connecting portion 12, the rotation center of the backstop 3 is shifted upward. be able to. As a result, the construction machine 10 can easily suppress interference between the backstop 3 and the winch 4 even when the boom 2 is lowered from the ventral side.

In a construction machine of high-post specifications, such as the construction machine 10, which includes a strut 5 for supporting the upper revolving body 1 from below, when the boom 2 is lowered from the ventral side, the rotation angle of the backstop 3 increases, and the backstop 3 increases. The top 3 and the winch 4 are likely to approach each other. Even with such a configuration, the construction machine 10 can easily suppress interference between the backstop 3 and the winch 4 .

Since the raising link 20 has the second support hole 21 into which the rotating shaft 30 is inserted above the first support hole 12a, the center of rotation of the backstop 3 can be shifted upward. Therefore, by fixing the raising link 20 to the connecting portion 12, interference between the backstop 3 and the winch 4 can be easily suppressed even when the boom 2 is lowered from the ventral side.

The raising link 20 is configured to be connectable to the first support hole 12 a provided in the connecting portion 12 . Therefore, when the raising link 20 is fixed to the upper revolving body 1 , it is not necessary to change the arrangement of other members such as limit switches mounted on the upper revolving body 1 . Therefore, the raising link 20 can be easily retrofitted to the existing construction machine 100 .

[Other embodiments]
The above embodiments do not limit the configuration of the present invention. Therefore, in the above embodiment, the components of each part of the above embodiment can be omitted, replaced, or added based on the description of the present specification and common general technical knowledge, and all of them are interpreted as belonging to the scope of the present invention. should.

In the above embodiment, the construction machine of high post specifications in which the upper revolving body is supported by the struts has been described. However, in the construction machine, the upper rotating body may be directly mounted on the lower running body. Further, the specific configuration of the undercarriage is not particularly limited, and may be, for example, a track type, a wheel type, or the like. Furthermore, the construction machine can adopt a configuration that does not include an undercarriage. For example, the construction machine may be a stationary construction machine in which the support is fixed to the floor.

In the above embodiment, the configuration in which the construction machine is a jib crane has been described. However, the construction machine is not limited to the jib crane. Further, in the above-described embodiment, the configuration in which the backstop is rotatably connected to the upper rotating body and the boom has been described. However, the backstop only needs to support the boom from the back side so as to prevent the boom from collapsing toward the back side, and may be connected to the upper revolving body in the form of a cantilever beam.

The specific configuration of the raising link is not particularly limited as long as it can be fixed to the connecting portion in a state in which the second support hole is located above the first support hole. For example, the raising link may have a pair of brackets arranged to sandwich the connecting portion.

In the above embodiment, a configuration has been described in which the second fixing hole of the raising link is arranged so as to overlap the connecting hole for mounting the gantry. However, the second fixing hole may be arranged so as to overlap with a hole other than the connecting hole for mounting the gantry. For example, the second fixing hole may be arranged so as to overlap the connecting hole for attaching the mast, or may be arranged so as to overlap other holes. Also, the arrangement of the second fixing holes in the bracket can be set based on the positions of the overlapping holes.

A construction machine according to an aspect of the present invention is suitable for suppressing interference between a backstop and a winch.

1 upper revolving body 2 boom 3 backstop 4 winch 5 strut 6 lower running body 6a crawler unit 7 gantry 10, 100 construction machine 11 revolving frame 12 connecting part 12a first support hole 12b connecting hole 20 raising link 20a bracket 21 second support Hole 22 First fixing hole 23 Second fixing hole 24 Convex portion 25 Inner cylinder 25a Spring seat 25b First connecting piece 26 Buffer spring 27 Outer cylinder 27a Second connecting piece 28 Spacer 30 Rotating shaft 31 First shaft member 32 Second shaft Material X Cradle

Claims (4)

an upper rotating body;
a boom attached to the upper revolving structure so as to be able to rise and fall;
a backstop that is rotatably provided with respect to the upper revolving structure and supports the boom from the back side to prevent the boom from collapsing toward the back side;
a winch mounted on the upper revolving structure between the boom and the backstop,
The construction machine, wherein the upper rotating body has a connecting portion having a first support hole into which a rotating shaft capable of rotatably connecting the backstop is inserted,
It further comprises a raising link that can be fixed to the connecting part,
The construction machine, wherein the raising link has a second support hole above the first support hole and into which the rotating shaft is inserted. The construction machine according to claim 1, further comprising a strut that supports the upper revolving body from below. 3. The construction machine according to claim 1, wherein the raising link has a fixing hole arranged so as to overlap the first support hole and fixed to the connecting portion. A backstop that supports the boom from the back side to prevent the boom from collapsing to the back side can be rotatably connected to the connecting portion of the upper rotating body having the first support hole into which the rotating shaft is inserted. configured,
A raising link provided with a second support hole into which the rotating shaft can be inserted above the first support hole.

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