WO2021162197A1 - 굴삭기용 진동감쇠장치 - Google Patents

굴삭기용 진동감쇠장치 Download PDF

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Publication number
WO2021162197A1
WO2021162197A1 PCT/KR2020/013704 KR2020013704W WO2021162197A1 WO 2021162197 A1 WO2021162197 A1 WO 2021162197A1 KR 2020013704 W KR2020013704 W KR 2020013704W WO 2021162197 A1 WO2021162197 A1 WO 2021162197A1
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WO
WIPO (PCT)
Prior art keywords
excavator
motion
vibration
bending
damping device
Prior art date
Application number
PCT/KR2020/013704
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English (en)
French (fr)
Korean (ko)
Inventor
정문교
Original Assignee
주식회사 맵
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 맵 filed Critical 주식회사 맵
Priority to JP2022543133A priority Critical patent/JP2023510895A/ja
Priority to CN202080094956.6A priority patent/CN115003928A/zh
Publication of WO2021162197A1 publication Critical patent/WO2021162197A1/ko

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/965—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of metal-cutting or concrete-crushing implements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/14—Booms only for booms with cable suspension arrangements; Cable suspensions

Definitions

  • the present invention relates to a vibration damping device for an excavator that is installed on an arm, boom, or attachment of an excavator for digging, transporting soil, dismantling a building, or cleaning the ground at a civil engineering, construction, or construction site to absorb vibration.
  • an excavator is a construction machine that performs work such as excavation work for digging the ground at civil engineering, construction, construction site, loading work for transporting soil, shredding work for dismantling buildings, grading work for clearing the ground, etc.
  • Equipment It consists of a traveling body that plays the role of moving the body, an upper revolving body that is mounted on the traveling body and rotates 360 degrees, and an attachment for work.
  • the attachment is appropriately mounted on the excavator according to the condition of the soil and rocks, the type of work and the use. , drill, tongs, gourds, etc.
  • the bucket is in charge of general excavation and transport of soil, the breaker crushes hard ground, rocks, etc., and the crusher is used for dismantling and crushing the building. do.
  • 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 has a tube shape with both ends open, and both ends in the longitudinal direction are connected to and installed in a connection body connected to and coupled to an excavator, respectively, and the vibration and impact force generated when the attachment of the excavator is operated is moved through bending motion.
  • a vibration damping device for an excavator including a motion absorber for absorbing kinetic energy.
  • the motion absorber has one end coupled to each end in the longitudinal direction of the connecting body, and the other end is extended to be inserted into the connecting body.
  • a pair of motion converting units that convert into are inserted and installed inside the connection body to be connected to the other end of the motion converting unit, and when the bending motion of the motion converting unit is bent, the bending in the direction perpendicular to the longitudinal direction of the connection body is more than a certain size It may include an absorbent support having flexibility to absorb the kinetic energy of the motion conversion unit while preventing it from becoming larger.
  • connection body is formed to protrude from the inner circumferential surface of the connection body so as to be located between the other end of the pair of motion conversion parts, and may include a support locking end that locks and fixes the absorbent support so that the absorbent support does not come off during the bending motion of the motion conversion part. have.
  • the motion conversion unit a coupling portion fixedly coupled to the longitudinal edge of the connection body, a connection shaft portion extending inwardly of the connection body from one side of the coupling portion, an edge of the connection shaft portion extending inwardly of the connection body It is coupled to the installation, and may include a bending increasing portion for increasing the weight of the longitudinal edge of the connecting shaft portion so that the connecting shaft portion bends by the vibration and impact force transmitted from the attachment.
  • the absorbent support may have a cylindrical shape with one side open, and an inner circumferential surface of the absorbent support may have a cross-sectional shape that increases in thickness from one side to the other.
  • the connecting shaft part is inserted and installed on the outside of the connecting shaft part, and when the connecting shaft part is bent, the bending in the direction parallel to and perpendicular to the longitudinal direction of the connecting body is prevented from increasing to a certain size or more, and the bending motion of the connecting shaft part is prevented It may further include an auxiliary absorber in the form of a ring having ductility to absorb the kinetic energy converted through the kinetic energy.
  • connection body is connected to at least one of an arm, a boom, and an attachment of the excavator, and both ends of the connection body are fixedly coupled to a pair of frames spaced apart from each other in a mutually facing state of the arm, boom, or attachment. can do.
  • a connecting hole is formed through the frame facing the excavator, and a flange portion having a fastening groove formed at one longitudinal end and the other longitudinal end of the connecting body is provided, and an edge of the flange portion is formed in the longitudinal direction of the connecting body.
  • a frame coupling step groove for engaging one end and the other longitudinal end in an inserted state in the connection hole may be formed.
  • the vibration damping device for an excavator connects and installs a connection body to a boom or arm of an excavator or a frame of an attachment, and while coupling one end of the motion absorber to both ends in the longitudinal direction of the connection body, the other end of the motion absorber is the connection body
  • the vibration and impact force generated through the operation of the attachment is transmitted to the connection body, and the vibration and impact force transmitted to the connection body is converted into kinetic energy through bending motion in the motion conversion part of the motion absorber. After being converted, it is absorbed by the absorbent support to ensure stable reduction of vibration and impact force.
  • FIG. 1 and 2 are perspective views of an installation state of a vibration damping device for an excavator according to an embodiment of the present invention.
  • FIG. 3 is an exploded perspective view of a vibration damping device for an excavator according to an embodiment of the present invention.
  • FIG. 4 is a configuration cross-sectional view of a vibration damping device for an excavator according to an embodiment of the present invention.
  • 5 to 7 are structural cross-sectional views of a vibration damping device for an excavator according to another embodiment of the present invention.
  • FIG. 8 is an exploded perspective view of a vibration damping device for an excavator according to another embodiment of the present invention.
  • FIG. 9 is a vertical acceleration measurement simulation graph in a state in which the vibration damping device for an excavator according to an embodiment of the present invention is installed.
  • FIG. 10 is a vertical acceleration measurement simulation graph in a state in which the vibration damping device for an excavator according to an embodiment of the present invention is not installed.
  • FIG. 1 and 2 are perspective views of an installation state of the vibration damping device for an excavator according to an embodiment of the present invention
  • FIG. 3 is an exploded perspective view of the vibration damping device for an excavator according to an embodiment of the present invention
  • FIG. It is a structural cross-sectional view of a vibration damping device for an excavator according to an embodiment of the present invention.
  • the vibration damping device 100a for an excavator according to an embodiment is a boom 10 of the excavator in a state provided with a connection body 100 and a motion absorber 200, an arm 20, It is coupled to at least one of the attachments 30 and installed.
  • the frame structure constituting the boom 10 or arm 20 of the excavator is a generally known structure having a rectangular box shape consisting of upper and lower wall portions 11 and 21 and left and right wall portions 12 and 22, and the attachment 30 ) of the frame may have a structure having a pair of opposing connecting plate portions 32 that enable connection with the arm 20 .
  • the vibration damping device 100a for an excavator of an embodiment is installed to connect the left and right wall parts 12 and 22 of the boom 10 or arm 20, or the connection plate part 32 of the attachment 30 is connected. It also serves to reinforce the strength of the frame of the boom 10 or arm 20 of the excavator or the frame of the attachment 30 while installing it so that it may be installed.
  • a connection hole 40 is formed in the frame of the boom 10 or the arm 20 or the attachment 30 so that both sides of the connection body 100 to be described later in the longitudinal direction can be respectively inserted.
  • connection body 100 is a portion coupled to the frame disposed to face the boom 10 or the arm 20 or the attachment 30 of the excavator. That is, the connection body 100 receives the vibration and impact force generated by the operation of the attachment 30 of the excavator, and then transmits it to the motion absorber 200 to be described later, as well as the boom 10 or arm ( 20) or reinforced with the frame strength of the attachment (30).
  • a connection body 100 is formed in a form in which a space is provided on the inside to provide a space for inserting and disposing the motion absorber 200 inward, and is preferably formed in the form of a circular tube with both ends in the longitudinal direction open. , of course, it may be formed in the form of a polygonal tube without being limited thereto.
  • one end of the motion absorber 200, and more specifically, the flange portion 120 is formed at one end in the longitudinal direction and the other end in the longitudinal direction of the connection body 100 so that the coupling unit 211 can be stably placed in close contact.
  • a fastening groove 121 may be formed in the flange part 120 to fasten the motion absorber 200 with a fastening member 130 such as a bolt.
  • both ends of the connection body 100 are the left and right wall parts 12 and 22 of the facing frame of the boom 10 or arm 20 of the excavator.
  • both ends of the connection body 100 may be coupled to the opposing frame of the boom 10 or arm 20 or the attachment 30 of the excavator through welding, but the present invention is not limited thereto. ), of course, can be combined through Referring to FIG.
  • a plurality of frame fastening holes 41 may be formed to be spaced apart from each other at a predetermined distance around the edge of the frame.
  • a frame coupling stepped groove 122 may be formed around the edge of the flange portion 120 .
  • the frame coupling step groove 122 is formed to a depth corresponding to the frame thickness of the boom 10 or arm 20 or the attachment 30 for coupling the connection body 100, the boom 10 or the arm ( 20) or when both ends of the connection body 100 in the longitudinal direction are respectively inserted into the connection holes 40 formed in the frame of the attachment 30, the frame portion can be engaged in a seated state in the frame coupling stepped groove 122 do.
  • the frame coupling stepped groove 122 enables the coupling of the frame of the connection body 100 and the boom 10 or the arm 20 or the attachment 30 to a stable engaging state.
  • the supporter engaging end 110 is It may be formed to protrude. This, the support engaging end 110, during the bending motion of the motion conversion unit 210, the absorbent support 220 so as not to depart from the end of the motion conversion unit 210 while the end portion of the absorbent support 220 is caught while The kinetic energy of the motion conversion unit 210 through the absorbent support 220 can be stably absorbed.
  • the inner side of the connecting body 100 more specifically, the inner part of the connecting body 100 on which the support stopping end 110 is formed, has an inner absorbent body formed of a rubber material or synthetic resin material having ductility (not shown). It may be provided with an insert.
  • the inner absorber may be formed in a block structure having a circular horizontal cross-sectional shape so as to be inserted correspondingly to the inside of the portion where the supporter engaging end 110 of the connecting body 100 is formed. This inner absorber absorbs some of the vibration and impact force transmitted to the connection body 100 in a state that is inserted and disposed inside the connection body 100 , and the residual vibration and impact force not absorbed in the absorption support 220 , which will be described later. to be delivered and absorbed.
  • an insertion groove portion 140 may be formed on the outer peripheral surface of the connection body 100 , and an outer absorbent material 300 having a flexible ring shape may be inserted into the insertion groove portion 140 .
  • the insertion groove 140 is preferably formed in the central portion based on the longitudinal direction of the connecting body 100, but is not limited thereto, and a plurality of insertion grooves 140 may be formed to be spaced apart from each other in the longitudinal direction of the connecting body 100 .
  • the outer absorber 300 may be formed of a synthetic resin material or a rubber material having ductility so as to absorb some of the vibration and impact force transmitted by the connection body 100 .
  • the motion absorber 200 is generated through the operation of the attachment 30 in a state in which the connection body 100 is connected and installed, and then is converted into kinetic energy while bending by the vibration and impact force transmitted to the connection body 100 . After the kinetic energy is absorbed, it is a part that reduces the vibration and impact force generated by the attachment 30 .
  • the motion absorber 200 is symmetrically installed at both ends in the longitudinal direction of the connection body 100 so as to increase the absorption efficiency of vibration and impact force transmitted to the connection body 100 .
  • one longitudinal end of the motion absorber 200 is installed to be connected to each edge in the longitudinal direction of the connection body 100 , and the other longitudinal end of the motion absorber 200 is connected to be inserted and disposed inside the connection body 100 . It is formed to extend in the inner direction of the body 100 .
  • the motion absorber 200 includes a motion conversion unit 210 and an absorbent support 220 .
  • the motion conversion unit 210 is a part that converts vibration and impact force generated during operation of the attachment 30 into kinetic energy through bending motion. These, the motion conversion unit 210 is configured as a pair to be installed at both ends of the connection body 100 in the longitudinal direction, and one end of the motion conversion unit 210 is connected to each end of the connection body 100 in the longitudinal direction. is fixedly coupled, and the other end is extended to be inserted into the connecting body 100 .
  • the motion conversion unit 210 includes a coupling unit 211 , a connecting shaft unit 212 , and a bending increase unit 213 .
  • the coupling part 211 is a part that is fixedly coupled to each edge in the longitudinal direction of the connection body 100 in a connected state.
  • the coupling part 211 has a disk shape so that it can be closely disposed to correspond to the longitudinal edge of the connection body 100 .
  • a fastening hole 211a is formed through the coupling part 211 at a position corresponding to the fastening groove 121 of the connecting body 100 .
  • one side of the coupling portion 211 that is, a surface portion opposite to the connection body 100, may be provided with a bonding plate material (not shown) in the form of a ring having ductility.
  • the contact plate material is positioned between the coupling portion 211 and the connecting body 100 and the mutually facing surfaces to prevent a gap from occurring between the coupling portion 211 and the connecting body 100, and the connecting body 100 ) to the coupling part 211 to prevent the coupling state of the coupling part 211 and the connection body 100 from being released while allowing some absorption and stable transmission of vibration and impact force, and connecting the coupling part 211 It is possible to prevent damage due to vibration and impact force in the coupling portion of the body 100 from occurring.
  • the connecting shaft portion 212 is a portion having a straight bar structure formed to extend from the coupling portion 211 to the inside of the connecting body 100 .
  • the connecting shaft portion 212 transmits the vibration and impact force transmitted to the coupling portion 211 to the bending increasing portion 213 and causes bending motion by the vibration and impact force.
  • the connecting shaft portion 212 is formed to extend from the center of the inner surface of the coupling portion 211 to the inner center direction of the connecting body 100, at this time being arranged to extend in a direction parallel to the longitudinal direction of the connecting body 100, and By being formed to have a smaller diameter than the inner diameter of the connecting body 100, the bending motion is made to the maximum size while preventing collision interference with the inner circumferential surface of the connecting body 100 inside the connecting body 100 during the bending motion. make it possible
  • the bending increasing part 213 is the connecting shaft part 212 at the other end of the longitudinal direction so that the connection shaft part 212 can bend stably through vibration and impact force transmitted to the connection shaft part 212 according to the operation of the attachment 30 .
  • This is the part that increases the weight.
  • the increase in bending portion 213 is installed in a connection state to the other end of the longitudinal direction of the connecting shaft portion (212).
  • the bending increasing portion 213 is formed in a circular cross-sectional shape having a step structure in which the diameter decreases from one side coupled to the other longitudinal end of the connecting shaft portion 212 to the other side toward the inner center of the connecting body 100.
  • both ends in the longitudinal direction of the connecting shaft portion 212 are formed to extend integrally from one side of the coupling portion 211 and one side of the bending increasing portion 213, and the connecting shaft portion 212 and the coupling portion 211 are The coupling portion and the edge portion where the connecting shaft portion 212 and the bending increasing portion 213 are connected are rounded, so that the vibration and impact force transmitted from the connecting body 100 is transferred from the coupling portion 211 to the connecting shaft portion 212 and the bending increased portion.
  • a through hole 214 to be connected in a straight line may be formed in the coupling portion 211 , the connecting shaft portion 212 , and the bending increasing portion 213 .
  • These, through-holes 214 when the bending increasing portion 213 is inserted into the inside of the connecting body 100, while allowing the gas inside the connecting body 100 to pass through, the bending increasing unit 213 is the inside of the connecting body 100. to be easily inserted into the In this way, when the through hole 214 is formed, the bending increasing part 213 is inserted into the connecting body 100 and then inserted into the through hole 214 formed in the connecting shaft part 212 and one end of the through hole 214 is cut.
  • a sealing stopper 215 for sealing may be provided.
  • the fastening member 130 is attached to the coupling portion 211 to prevent the separation of the sealing stopper 215.
  • the fixing plate 216 has a connection fastening hole 217 formed at a position corresponding to the fastening hole 211a of the coupling part 211 to enable fastening through the fastening member 130 .
  • the through holes 214a and 214b are formed through a plurality of horizontal lines arranged in a diagonal or parallel to each other so as to connect from one side to the other side of the bending increase part 213 .
  • the absorbent support 220 prevents the bending in the direction perpendicular to the longitudinal direction of the connecting body 100 during the bending motion of the motion converting unit 210 from increasing to a certain size or more, as well as the motion converting unit 210 of the It is a member that can absorb the kinetic energy converted through bending motion.
  • the absorbent support 220 is a bending increase portion of the motion conversion unit 210 to prevent the bending in the direction perpendicular to the longitudinal direction of the connecting body 100 during the bending motion of the motion absorber 200 from increasing to a certain size or more. (213) can be supported.
  • the absorbent support 220 may be formed of a synthetic resin or rubber material having ductility so as to stably absorb the kinetic energy transmitted from the motion conversion unit 210 in a state in which it is connected to the motion conversion unit 210 .
  • the absorbent support 220 is inserted and installed inside the connecting body 100 so as to be connected to the other end of the motion converting unit 210 , and in more detail, the inner surface of the connecting body 100 and the motion converting unit 210 . Inserted and installed in the inside of the connection body 100 so as to be disposed between the other end of the outer surface. That is, the absorbent support 220 is installed inside the connection body 100 in a state of being inserted and disposed outside the bending increasing portion 213 of the motion conversion unit 210 .
  • the absorbent support 220 is made in the form of a cylinder with a space provided on the inside in a state with one side open, and on the inner circumferential surface of the absorbent support 220 in the longitudinal direction of the connection body 100 from one side toward the other side.
  • a connection through-hole 221 connected to the through-holes 214, 214a, 214b formed in the above-described bending-increasing portion 213 is formed through the other side surface of the absorbent support 220, and the absorbent support 220 is formed with a bending-increasing portion 213 ), while allowing the air to be discharged when inserted, to facilitate the insertion, and when inserting the bending-increasing part 213 into the inside of the connecting body 100, the air inside the connecting body 100 passes through a hole ( 214) to make it easier to insert while allowing it to be discharged to the outside.
  • the bending of the motion converting unit 210 occurs over a certain size during a bending motion through the motion converting unit 210 of the motion absorber 200 .
  • an auxiliary absorber 400 for absorbing kinetic energy generated through the bending motion of the motion conversion unit 210 may be additionally provided. That is, the auxiliary absorber 400 has a bending motion in a direction parallel to the longitudinal direction of the connecting body 100 and perpendicular to the longitudinal direction of the connecting body 100 during the bending motion of the motion absorber 200 by a certain size or more. It is possible to support the connecting shaft portion 212 and the deflection-increasing portion 213 of the motion absorber 200 to prevent the increase.
  • the auxiliary absorber 400 has a ring shape and may be composed of auxiliary unit members 400a and 400b having a pair of semicircular shapes symmetrical to each other.
  • the auxiliary absorber 400 may be made of a rubber or synthetic resin material having ductility so that the kinetic energy converted through the bending motion of the motion conversion unit 210 can be stably absorbed, and inside the connection body 100 . It may be inserted into the outside of the connecting shaft portion 212 of the motion conversion unit 210 to be disposed.
  • the vibration and impact force moved to the frame of the boom 10 or arm 20 of the excavator is transmitted to the motion absorber 200 through the connection body 100 .
  • some of the vibration and impact force transmitted to the connection body 100 are reduced while being absorbed through the outer absorber 300 .
  • the vibration and impact force transmitted to the motion absorber 100 is transmitted to the bending increasing unit 213 of the motion converting unit 210 to cause the bending of the connecting shaft unit 212 to occur.
  • the vibration and impact force transmitted to the motion conversion unit 210 is reduced while being converted into kinetic energy through bending in the connecting shaft unit 212 .
  • the connecting shaft portion 212 has a certain displacement or more, that is, the amount of bending displacement of the connecting shaft portion 212. It minimizes the vibration and impact force transmitted to the frame of the boom 10 or arm 20 of the excavator while stably maintaining it not exceeding this yield point and absorbing vibration and impact force, and the attachment 30 and By minimizing the damage caused by vibration and impact force on the connection part of the arm 20 of the excavator or the connection part of the boom 10 and the arm 20 of the excavator, it increases the service life and prevents the operator from feeling fatigued.
  • the vibration damping device 100a for an excavator is installed on the frame of the attachment 30 as shown in FIG. 2 and an acceleration sensor is installed on the upper end of the frame of the attachment 30, the attachment 30 When hitting the plate fixed to the ground with ), the acceleration value that is the repulsive energy in the vertical direction measured by the attachment 30 and the conventional general attachment that does not install the vibration damping device 100a hit the plate fixed to the ground Table 1 below shows the acceleration value, which is the repulsion energy in the vertical direction, measured at the attachment.
  • Measured acceleration average value (g) 1 time Episode 2 3rd time 4 times 5 times conventional attachment 23.04 25.69 25.07 22.22 24.01 Attachment installed with vibration damping device of the present invention 8.71 13.80 10.43 11.55 11.12
  • the vibration damping device for an excavator is connected
  • the body 100 is connected to the boom 10 of the excavator, the arm 20 or the frame of the attachment 30, and one end of the motion absorber 200 is coupled to both ends in the longitudinal direction of the connection body 100, while the motion absorber
  • the other end of the 200 is inserted and installed so as to extend to the inner center of the connection body 100 , the vibration and impact force generated through the operation of the attachment 30 is transmitted to the connection body 100 , and the connection body 100 .
  • the vibration and impact force transmitted to the motion absorber 200 is converted into kinetic energy through bending motion in the motion conversion unit 210 of the motion absorber 200, and then is absorbed by the absorbent support 220 while stably reducing the vibration and impact force.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Vibration Dampers (AREA)
  • Vibration Prevention Devices (AREA)
PCT/KR2020/013704 2020-02-11 2020-10-08 굴삭기용 진동감쇠장치 WO2021162197A1 (ko)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2022543133A JP2023510895A (ja) 2020-02-11 2020-10-08 掘削機用振動減衰装置
CN202080094956.6A CN115003928A (zh) 2020-02-11 2020-10-08 用于挖掘机的减振装置

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KR1020200016498A KR102131767B1 (ko) 2020-02-11 2020-02-11 굴삭기용 진동감쇠장치
KR10-2020-0016498 2020-02-11

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KR102131767B1 (ko) * 2020-02-11 2020-07-09 주식회사 맵 굴삭기용 진동감쇠장치

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KR102131767B1 (ko) * 2020-02-11 2020-07-09 주식회사 맵 굴삭기용 진동감쇠장치

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