KR20210061685A - Vibration damper for excavator - Google Patents

Abstract

The present invention provides a vibration damping device for an excavator, which comprises: a connection body connected and installed in a boom or an arm of an excavator and having a pipe shape of which both ends are opened; and a pair of movement absorbing bodies of which one end is coupled and installed to each longitudinal end part of the connection body and the other end is extended to be inserted into the connection body to convert and absorb vibration and impact force transmitted from an attachment into bending movement.

Description

Vibration damper for excavator {Vibration damper for excavator}

The present invention relates to a vibration damping device for an excavator that is installed on an arm or boom of an excavator for digging, transporting soil, dismantling a building, and clearing the ground at civil engineering, building, and construction sites to absorb vibration.

In general, an excavator is a construction machine that performs works such as excavation work to dig the ground at civil works, construction, and construction sites, load work to transport soil, crush work to dismantle buildings, and stop work to clear the ground. It is composed of a traveling body that acts as a movement of the vehicle, an upper rotating body that rotates 360 degrees and an attachment for work.

Here, in the construction of the excavator, the attachment is appropriately installed and used in the excavator according to the state of soil and rock, the type of work, and the purpose, and the types of such attachments include a bucket, a breaker, and a crusher. , Drill, tongs, gourd, etc.

These attachments can be exchanged and used in various ways according to the situation of the construction site. Typically, the bucket is in charge of general excavation and soil transportation, the breaker crushes hard ground, rocks, etc., and the crusher is used for dismantling and crushing the building. do.

As described above, various excavator attachments are applied to almost all construction works, and are effectively used in the right place for construction work such as burying drains, burying pipes, digging the foundation of buildings, and loading soil.

However, when working with an excavator attachment, vibrations and shocks are generated because the ground is dug, cut, and drilled, and the vibrations and shocks are transmitted from the arm to the boom, so that the connection between the arm and the attachment, the connection between the arm and the boom. In addition to reducing the lifespan, there is a problem of causing fatigue to workers and causing musculoskeletal disorders. In particular, when the ground or rock is crushed by using a breaker as an attachment for an excavator, there is a problem in that a stable impact force to the ground or rock is not transmitted as the vibration is dispersed by the arm and the boom.

In order to solve this problem, conventionally, a structure in which a passive or active vibration absorbing device designed in advance is additionally mounted and installed in the excavator itself, but this vibration absorbing device is applicable only to one type of designed excavator and is applicable to various types of excavators. There is a problem that is difficult to apply.

The technology related to an excavator having such a vibration absorbing device is presented in Korean Patent Publication No. 2009-0111792 (2009.10.27).

An object of the present invention is to provide a vibration damping device for an excavator capable of stably absorbing vibration and impact force generated from an attachment for an excavator regardless of the type of the excavator.

The present invention is connected and installed to the boom or arm of an excavator, the connecting body having a tube shape with both ends open, one end is coupled to each end of the connecting body in the longitudinal direction, and the other end is extended to be inserted into the inside of the connecting body It provides a vibration damping device for an excavator including a pair of motion absorbers for converting and absorbing the vibration and impact force transmitted from the attachment into a bending motion.

In addition, the motion absorber is a coupling portion fixedly coupled to an outer end in the longitudinal direction of the connection body, a connection shaft portion extending from one side of the coupling portion to the inside of the connection body, and coupling and installation to the end of the connection shaft portion, and from the attachment It may include a bending increase portion for increasing the weight of the end of the connection shaft portion to bend the connection shaft portion by the transmitted vibration and impact force.

In addition, it is inserted and installed inside the connection body and prevents the bending in a direction perpendicular to the longitudinal direction of the connection body from increasing beyond a certain size during the bending motion of the motion absorber and absorbs the kinetic energy of the motion absorber. It may further include a support having a.

In addition, the support may have a cylindrical shape with one side open, and an inner circumferential surface of the support may have a cross-sectional structure whose thickness increases from one side to the other.

In addition, it is inserted and installed on the outside of the connecting shaft, and when the motion absorber is flexed, it prevents the bending in a direction parallel to and perpendicular to the longitudinal direction of the connecting body from becoming larger than a certain size, while also reducing the kinetic energy of the motion absorber. It may include an auxiliary absorber in the form of a ring having a softness to absorb.

In the vibration damping device for an excavator according to the present invention, the connecting body is connected to the boom or arm of the excavator, and the other end of the motion absorber is inserted into the inner side of the connecting body while one end of the motion absorber is coupled to the longitudinal end of the connecting body. As long as possible, the vibration and impact force generated through the operation of the excavator attachment is transmitted to the connecting body, and the vibration and impact force transmitted to the connecting body is converted into kinetic energy through the bending motion of the motion absorber, resulting in stable reduction. Let it go.

1 is a perspective view of an installed state of a vibration damping device for an excavator according to an embodiment of the present invention.
2 is an exploded perspective view of the vibration damping device for an excavator shown in FIG. 1.
3 is a cross-sectional view taken along line III-III shown in FIG. 1.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of an installation state of the vibration damping device for an excavator according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the vibration damping device for an excavator shown in FIG. 1, and FIG. It is a cross-sectional view along the line. 1 to 3, the vibration damping device 100 for an excavator according to an embodiment is coupled to a boom or arm of an excavator while having a connection body 110 and a motion absorber 120. Here, the structure of the frame 10 constituting the boom or arm of the excavator is a general known structure having a rectangular vertical cross-sectional shape consisting of the upper and lower wall portions 11 and the left and right wall portions 12, and the vibration damping device for an excavator ( 100) also serves to reinforce the strength of the frame 10 of the boom or arm of the excavator by installing the coupling so as to connect the left and right wall portions 12 to each other.

The connection body 110 is a portion coupled to the frame 10 constituting the boom or arm of the excavator. That is, the connection body 110 receives the vibration and impact force generated by the operation of the attachment of the excavator from the boom or arm, and then transmits it to the motion absorber 120 to be described later, and the frame of the boom or arm of the excavator ( Reinforce with the strength of 10). This, the connection body 110 is shown to have a circular tube shape with both ends open in the longitudinal direction so as to provide a space for inserting and placing the motion absorber 120 inward, but is not limited thereto, and may be formed in a polygonal tube shape. Of course it may be.

Here, both ends of the connection body 110, that is, one end in the longitudinal direction and the other end in the longitudinal direction are coupled to the left and right wall portions 12 of the frame 10 of the boom or arm of the excavator, respectively. In addition, a flange portion 111 is formed at one end in the longitudinal direction and at the other end in the longitudinal direction of the connection body 110 so that one end of the motion absorber 120 can be stably placed in close contact, and the flange portion 111 is fastened such as a bolt. The fastening groove 112 is formed so that the motion absorber 120 can be fastened through the member 115.

In addition, an insertion groove 113 may be formed on the outer circumferential surface of the connection body 110, and a ring-shaped outer absorbent 114 having ductility may be inserted into the insertion groove 113. The outer absorbent material 114 may be formed of a synthetic resin material or rubber material having ductility so as to absorb some of the vibration and impact force transmitted from the connection body 110.

The motion absorber 120 converts and absorbs into kinetic energy while flexing by vibration and impact force transmitted from the attachment to the connection body 110 in a state connected to the connection body 110, so that the vibration and impact force generated from the attachment This is the part that reduces the value. At this time, the motion absorber 120 is configured as a pair so as to be connected and installed at both ends of the connection body 110 in the longitudinal direction. Here, one end in the longitudinal direction of the motion absorber 120 is fixedly coupled to each end in the longitudinal direction of the connection body 110, and the other end in the longitudinal direction of the motion absorber 120 extends to be inserted into the inner side of the connection body 110. Is formed. The motion absorber 120 includes a coupling portion 121, a connection shaft portion 123, and a bending increase portion 124.

The coupling portion 121 is a portion that is fixedly coupled to an end portion in the longitudinal direction of the connection body 110. Such, the coupling portion 121 has a disk shape so that it can be closely arranged to correspond to the longitudinal end of the connection body 110. In addition, a fastening hole 122 is formed through the coupling portion 121 at a position corresponding to the fastening groove 112 of the connection body 110. At this time, one side of the coupling portion 121, that is, a surface portion facing the connection body 110 may be provided with a ring-shaped close contact plate (not shown) having ductility. Such, the contact plate is located between the coupling portion 121 and the connection body 110 and prevents a gap from occurring between the coupling portion 121 and the connection body 110, and the coupling portion in the connection body 110 It prevents the release of the fastened state of the coupling part 121 and the connection body 110 while stably transmitting vibration and impact force to the 121 and prevents damage in the coupling part of the coupling part 121 and the connection body 110. To be able to prevent it.

The connection shaft part 123 is a part formed to extend from the coupling part 121 to the inside of the connection body 110. The connecting shaft portion 123 transmits the vibration and impact force transmitted to the coupling portion 121 to the bending increase portion 124 and performs a bending motion due to vibration and impact force. Here, the connection shaft part 123 is formed to extend from the center of one side surface of the coupling part 121 in the inner direction of the connection body 110, and is arranged to extend in a direction parallel to the length direction of the connection body 110, During the bending movement, the bending movement can be performed to the maximum size while preventing collision interference with the inner circumferential surface of the connection body 110 from occurring inside the connection body 110.

The bending increase part 124 is a part that increases the weight of the other end of the connection shaft part 123 so that the connection shaft part 123 can flexibly move through vibration and impact force transmitted from the attachment to the connection shaft part 123. This, the bending increase portion 124 is coupled to the other end in the longitudinal direction of the connecting shaft portion 123 is installed in a connected state. At this time, the bending increase portion 124 is formed in a stepped circular cross-sectional shape so that the diameter decreases from one side coupled to the other end in the length direction of the connection shaft portion 123 to the other side, and the contact area with the support 130 to be described later. In addition to the maximum increase, the center of gravity of the bending increase part 124 is located in the direction of the connection shaft part 123 based on the longitudinal direction of the connection shaft part 123, thereby increasing the bending part 124 and the connecting shaft part 123 in the longitudinal direction. It is possible to minimize the concentration of stress at the bonding site of the other end. Here, reference numeral 125 denotes a through hole through which the gas inside the connection body 110 can pass when the bend increasing portion 124 is inserted and disposed inside the connection body 110.

Here, both ends in the longitudinal direction of the connection shaft part 123 are formed to extend integrally from one side of the coupling part 121 and one side of the bending increase part 124, and the connection shaft part 123 and the coupling part 121 The coupling portion and the edge portion of the coupling shaft portion 123 and the flexure increase portion 124 are rounded, so that the vibration and impact force transmitted from the connection body 110 is transmitted from the coupling portion 121 to the connection shaft portion 123 and the flexure increase portion 124 ) To prevent cracks from occurring at the joint portion of the coupling portion 121 and the coupling shaft portion 123 and the coupling portion of the coupling portion 123 and the bending increase portion 124 while ensuring stable distributed transmission when delivered sequentially. Make it possible.

As such, the vibration damping device for an excavator according to an embodiment is ductile so as to absorb the kinetic energy of the motion absorber 120 while preventing the occurrence of bending beyond a certain size during the bending motion of the motion absorber 120 The support 130 and the auxiliary absorber 140 made of a material having a may be provided in an inserted state inside the connection body 110. Here, the support 130 is the bending increase portion 124 of the motion absorber 120 to prevent the bending in a direction perpendicular to the length direction of the connection body 110 from increasing beyond a certain size during the bending motion of the motion absorber 120 ) To support. And, the auxiliary absorber 140 is the movement absorber 120 to prevent the bending in a direction parallel to the length direction of the connection body 110 and a direction perpendicular to the length direction of the connection body 110 from increasing to a certain size or more during the bending movement of the movement absorber 120 It is possible to support the connection shaft portion 123 and the bending increase portion 124. The support 130 is inserted and installed in the connection body 110 so as to be disposed between the inner surface of the connection body 110 and the outer surface of the other end of the motion absorber 120. That is, the support 130 is inserted and installed in the connection body 110 so as to be disposed outside the bending increase portion 124 of the motion absorber 120. Here, the support 130 is made in a cylindrical shape with a space provided on the inside with one side open, and the inner circumferential surface of the support 130 has a cross-sectional shape that increases in thickness from one side to the other side. ) By forming a stepped structure corresponding to the outer surface of the movement absorber 120, while maximizing the contact area with the bend increasing portion 124 of the motion absorber 120, and enabling stable support during the bending movement of the bend increasing portion 124. In addition, the auxiliary absorber 140 is inserted and installed in the connection body 110 so as to be disposed outside the connection shaft part 123. At this time, the auxiliary absorber 140 has a ring shape and may be formed of a pair of semicircular ring members 140a and 140b that are symmetrical to each other. Here, reference numeral 131 denotes the other end of the motion absorber 120, that is, when the bend increasing portion 124 is inserted into the inner side of the support 130, the gas inside the support 130 is discharged while allowing a stable insertion. It is a through hole.

As described above, the absorbing action of vibration and impact force generated during operation of the attachment of the vibration damping device for an excavator according to an exemplary embodiment configured as described above will be described with reference to FIGS. 1 to 3.

First, when the attachment is operated, the vibration and impact force moved to the frame 10 of the boom or arm of the excavator are transmitted to the motion absorber 120 through the connection body 110. At this time, some of the vibration and impact force in the connection body 110 is reduced through the outer absorber 114.

In addition, the vibration and impact force transmitted to the motion absorber 120 is transmitted to the bending increase unit 124 so that the connection shaft portion 123 is bent. In this way, the vibration and impact force transmitted to the motion absorber 120 is reduced as it is converted into a bending motion of the connection shaft part 123.

At this time, during the bending movement of the motion absorber 120 through the support 130 and the auxiliary absorber 140, the connection shaft part 123 is stable so that the amount of bending displacement of the connection shaft part 124 is not more than a certain displacement, that is, the amount of bending displacement of the connection shaft part 124 exceeds the yield point. In addition to being maintained as a bar, it minimizes the vibration and impact force transmitted to the boom of the excavator or the frame 10 of the arm while absorbing the vibration and impact force additionally, the attachment to the arm connection part of the excavator or the connection of the boom and arm of the excavator By minimizing the occurrence of damage caused by vibration and impact force on the part, it is possible to increase the service life and minimize the occurrence of fatigue to the operator.

Here, the vibration damping device for an excavator according to an embodiment is a state in which the connection body 110 is connected to the boom or arm of the excavator, and one end of the motion absorber 120 is coupled to the longitudinal end of the connection body 110 A bar extended and installed so that the other end of the furnace motion absorber 120 is inserted into the inner side of the connection body 110, the vibration and impact force generated through the operation of the attachment for an excavator is transmitted to the connection body 110, and the connection body 110 ) Transmitted to the vibration and impact force is converted into kinetic energy through the bending motion of the motion absorber 120 so that stable reduction is achieved.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those of ordinary skill in the art will appreciate that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

100: vibration damping device 110: connection body
111: flange portion 112: fastening groove
113: insertion groove 114: outer absorbent material
120: motion absorber 121: coupling portion
122: fastening hole 123: connecting shaft portion
124: bending increase portion 130: support
140: auxiliary absorber

Claims (5)

A connecting body connected to the boom or arm of the excavator and having a tube shape with open both ends;
An excavator comprising: a pair of motion absorbers having one end coupled to each end of the connection body in the longitudinal direction, and the other end extending so as to be inserted into the connection body and converting and absorbing vibration and impact transmitted from the attachment into bending motion. Vibration damping device for use. The method according to claim 1,
The motion absorber,
A coupling part fixedly coupled to the outer end in the longitudinal direction of the connection body,
A connection shaft portion extending from one side of the coupling portion to the inside of the connection body, and
A vibration damping device for an excavator comprising a bending increase unit that is coupled to the end of the connection shaft and increases the weight of the end of the connection shaft so that the connection shaft flexes by vibration and impact force transmitted from the attachment. The method according to claim 1,
It is inserted and installed inside the connection body, and has ductility that absorbs the kinetic energy of the motion absorber while preventing the bending in a direction perpendicular to the length direction of the connection body from becoming larger than a certain size during the bending motion of the motion absorber. Vibration damping device for an excavator further comprising a support. The method of claim 3,
The support has a cylindrical shape with one side open,
A vibration damping device for an excavator having a cross-sectional shape in which the inner circumferential surface of the support increases in thickness from one side to the other. The method according to claim 2,
It is inserted and installed on the outside of the connection shaft, and prevents the bending in a direction parallel to and perpendicular to the longitudinal direction of the connection body from becoming larger than a certain size during the bending motion of the motion absorber and absorbs the kinetic energy of the motion absorber. A vibration damping device for an excavator comprising a ring-shaped auxiliary absorber having ductility.

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