WO2023128314A1 - Structure de raccordement de machine de travail agricole de type à entraînement central - Google Patents

Structure de raccordement de machine de travail agricole de type à entraînement central Download PDF

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Publication number
WO2023128314A1
WO2023128314A1 PCT/KR2022/018963 KR2022018963W WO2023128314A1 WO 2023128314 A1 WO2023128314 A1 WO 2023128314A1 KR 2022018963 W KR2022018963 W KR 2022018963W WO 2023128314 A1 WO2023128314 A1 WO 2023128314A1
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WO
WIPO (PCT)
Prior art keywords
mounting box
gearbox
hinge plate
agricultural
mounting
Prior art date
Application number
PCT/KR2022/018963
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English (en)
Korean (ko)
Inventor
김중호
Original Assignee
로보드림 주식회사
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 로보드림 주식회사 filed Critical 로보드림 주식회사
Publication of WO2023128314A1 publication Critical patent/WO2023128314A1/fr

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B59/00—Devices specially adapted for connection between animals or tractors and agricultural machines or implements
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
    • A01B59/00—Devices specially adapted for connection between animals or tractors and agricultural machines or implements
    • A01B59/04—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines pulled or pushed by a tractor
    • A01B59/042—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines pulled or pushed by a tractor having pulling means arranged on the rear part of the tractor

Definitions

  • the present invention relates to a centrally driven agricultural working machine, and more particularly, to a centrally driven agricultural working machine connection structure that can be easily attached to and detached from the rear of an agricultural tractor using a quick attachment.
  • a Rotavator one of agricultural working machines, is an agricultural machine used for cultivating land for sowing or transplanting crops.
  • the rotavator is mounted on a cultivator or tractor and rotates a plurality of tillage blades provided on a tillage shaft receiving power from the engine of the tiller or tractor to plow the farmland to an appropriate depth so that crops can be seeded or transplanted. will be.
  • the conventional rotavator disclosed in the prior art literature has a main body in which the power transmission unit to which the power of the tractor is transmitted is provided in the upper center area, and both ends are finished with respective side plates, and both sides installed between the power transmission unit and both side plates, respectively. With one end connected to the support frame and the power transmission unit, the other end passes through the left side plate through one support frame, that is, the left support frame, and the gear coupling shaft provided rotatably and coupled to the left end of the gear coupling shaft.
  • a gearbox consisting of a first sprocket wheel rotated in a rotated state and a second sprocket wheel connected by a chain while being coupled and rotated to a tiller shaft is configured.
  • a plurality of tillage blades are installed in a coupled and fixed state on the tillage shaft, and the farmland is plowed to an appropriate depth while being rotated by the tillage shaft.
  • the present invention has been made to solve the problems of the prior art as described above, and a quick attachment is provided at the rear 3-point link of the agricultural tractor, and a central Its purpose is to provide a drive-type agricultural work machine connection structure.
  • the central drive-type agricultural implement connection structure is an agricultural implement connection structure that is capable of transmitting power to an agricultural tractor.
  • a box is provided, and a quick attachment having an upper link and a lower link coupled to the upper and lower mounting pins of the mounting box, respectively, is characterized in that the tractor is provided with an agricultural work machine connection structure.
  • the quick attachment includes a frame in which the upper link of the three-point links of the tractor is hinged, and a slider provided on both sides of the frame and in which the lower link of the three-point links is hinged, and the frame includes an upper link
  • An upper hook coupled to the upper mounting pin of the mounting box may be rotatably provided, and a lower hook coupled to the lower mounting pin of the mounting box by a lower link may be rotatably provided on the slider.
  • the quick attachment may be provided so that the sliders can be moved in and out from both sides of the frame so that the width of both sliders can be adjusted.
  • the agricultural work machine may be provided with a gearbox driven by receiving power from the tractor at its center, and a mounting box hinged to the gearbox to roll the gearbox based on the hinge with the mounting box.
  • the mounting box is formed with a front hinge plate and a rear hinge plate protruding
  • the gearbox is provided with an input shaft that is penetrated into the front hinge plate and capable of relative rotation, and a hinge plate that is hinged to the rear hinge plate and capable of rolling by being hinged with a pin.
  • the hinge plate may include a plurality of long holes through which pins penetrating the hinge plate of the gearbox are coupled to allow upward and downward movement, and stop holes through which other pins penetrating the hinge plate are coupled to block flow.
  • a shock absorber may be provided between the mounting box and the gear box to buffer the gear box rolling in the mounting box.
  • the agricultural implement since the agricultural implement can be easily and quickly detached and attached to the quick attachment installed on the three-point link at the rear of the agricultural tractor, its workability is improved.
  • FIG. 1 is a view of a state in which a rotavator exemplified as an example of an agricultural work machine according to the present invention is connected to a tractor by a quick attachment.
  • FIG. 2 is a view showing a quick attachment according to the present invention.
  • Figure 3 is a separation view of the rotavator and the quick attachment according to the present invention.
  • FIG. 4 is an exploded view of FIG. 3 viewed from another direction.
  • FIG. 5 is a combined view of FIG. 4 .
  • FIG. 6 is a separated view of the rotavator according to the present invention.
  • FIG. 7 is a front configuration view of a rotavator according to the present invention.
  • FIG. 8 is a side configuration diagram of FIG. 7 .
  • Figure 9 is a separation view of the gearbox and the mounting box constituted in the rotavator according to the present invention.
  • FIG. 10 is a view showing a shock absorber configured between a rotavator and a mounting box according to the present invention.
  • FIGS. 1 to 10 are drawings showing a central drive type rotavator and a quick attachment and a connection structure thereof according to the present invention.
  • the agricultural working machine according to the present invention is mounted to be connected to the rear of the agricultural tractor to enable transmission of power.
  • the agricultural work machine includes a harvester, a rotavator, a plow, a seeder, a mower, a soil cover machine, a trailer, a baler, a compost spreader, etc. Let's explain.
  • the rotavator 100 is provided mounted on the rear of the tractor.
  • a three-point link consisting of an upper link 10 and a lower link 11 is provided at the rear of the tractor 1, and a quick attachment 200 is coupled and mounted to the three-point link of the tractor 1, and the quick attachment ( 200), the rotavator 100 is coupled and mounted.
  • the quick attachment 200 as shown in Figures 2 and 3, the frame 210 to which the upper link 10 of the three-point link of the tractor 1 is rotatably coupled, and the frame 210 It is provided on both sides and includes a slider 220 to which the lower link 11 of the three-point link is rotatably coupled.
  • the frame 210 is provided side by side with the rotavator 100, and the upper hook 211 coupled to the mounting box 130 to be described later is rotatable on the upper link 10 on the side facing the rotavator 100. are provided
  • the slider 220 is provided orthogonally to the rotavator 100, and the lower link 11 on the side facing the rotavator 100 has a lower hook 221 coupled to the mounting box 130 to be described later. It is provided rotatably.
  • the sliders 220 as described above are provided to enter and exit from both sides of the frame 210, so that the width of both sliders 220 can be adjusted.
  • the upper hook 211 on the side of the frame 210 is formed in a hook shape with an opening facing downward at its front end, and the upper mounting pin 133 of the mounting box 130 configured in the rotavator 100 to be described later coupled to
  • the lower surface of the frame 210 is provided with a power transmission unit 230 for transmitting power of the tractor 1 to the rotavator 100, coupled with the power transmission unit 120 of the gearbox 110 to be described later. do.
  • the lower hook 221 on the side of the slider 220 is formed in a hook shape facing upward so that the opening at its front end is opposite to the opening of the upper hook 211, and the lower mounting pin of the mounting box 130 to be described later ( 134).
  • the upper hook 211 of the quick attachment 200 is coupled to the upper mounting pin 133 of the mounting box 130 configured in the rotavator 100 from top to bottom, and the lower part of the quick attachment 200
  • the hook 221 is inserted into and coupled to the lower mounting pin 134 of the mounting box 130 from bottom to top, so that the upper and lower hooks 211 and 221 are rotated in the direction facing each other, and the upper and lower mounting pins ( 133) Rotavator 100 according to the defect in (134) is equipped with a strong coupling force to the quick attachment (200).
  • the rotavator 100 detached from and attached to the quick attachment 200 of the tractor 1 is driven by receiving the power of the tractor 1 in the center, as shown in FIGS. 6 to 8
  • the gearbox 110 is integrally provided, and the rotor batter 100 is balanced on both left and right sides based on this gearbox 110.
  • a hollow mounting frame 113 is provided to protrude from the top of both sides of the gearbox 110, and the mounting frame 113 has a center back plate covering the main shaft 111 or the tilling shaft 190 ( 150) is provided, and side back plates 160 are coupled to both sides of the center back plate 150.
  • the side back plate 160 is provided to be in and out between the center back plate 150 and the mounting frame 113 and may be provided to expand the rotavator 100.
  • a central door 170 extending toward the ground is rotatably provided at the rear end of the center back plate 150 to cover the main shaft 111 or the tillage shaft 190, and also at the rear end of the side back plate 160.
  • a side door leaf 180 extending toward the ground is rotatably provided.
  • the side doors 180 may be provided to be accessible from both sides of the central door 170 so that the overall length of the door can be extended like the center deck 150 and the side deck 160 at the top.
  • the gearbox 110 above the mounting frame 113 is provided with a power transmission unit 120 connected to the power transmission unit 230 of the quick attachment 200 and receiving power of the tractor 1, As shown in FIG. 8 , the power transmission units 120 and 230 may be provided so that power is transmitted by coupling by dog clutches corresponding to each other.
  • the power transmission unit 120 is provided with an input shaft 121 protruding toward the quick attachment 200 of the tractor 1, and a dog clutch at the front end of the protruding input shaft 121 is provided to be fixed, and a first sprocket wheel 124 is connected to the rear end of the input shaft 121 to transmit power.
  • the first sprocket wheel 124 is connected to the second sprocket wheel 112 of the main shaft 111 to be described later via a chain 125 to transmit power.
  • the main shaft 111 is provided on both lower sides of the gearbox 110 to protrude to both sides of the gearbox 110, and the second sprocket wheel 112 is fixed to the main shaft 111. It is provided so that the second sprocket wheel 112 and the main shaft 111 are rotated simultaneously in the gearbox 110.
  • the power of the tractor 1 is input to the input shaft 121 through the power transmission units 120 and 230, and the input power is transmitted to the first sprocket wheel 124, chain 125 and the second sprocket wheel ( 112) is transmitted to the main shaft 111 and output.
  • each tillage shaft 190 on which tillage blades 191 are installed is provided in a state in which relative rotation is not possible, so that the tillage shafts 190 on both sides are rotated together with the main shaft 111, so that farmland will plow the
  • the main shaft 111 or the tilling shaft 190 or the main shaft 111 and the tilling shaft 190 provided as described above remove weeds from the tilled soil while rotating like a shaft
  • a lug bar 116 is provided to prevent weeds from being wound around the shaft.
  • the lug bar 116 is provided in the axial direction between the shaft and the tiller blade 191 to remove weeds not removed by the tiller blade 191, thereby preventing weeds from being wound around the shaft in advance.
  • the lug bar 116 is illustrated as an example that is provided only to the main shaft 111 in FIG. 7 of this embodiment, it is preferable to be provided to the main shaft 111 as well as the tilling shaft 190.
  • the lug bar 116 when the lug bar 116 is provided on the main shaft 111, a bearing is provided between the gearbox 110 and the main shaft 111, and a tiller blade 191 on an inner ring rotating like the main shaft 111 among the bearings. ) is fixed, and the lug bar 116 may be provided to protrude in the axial direction on the tiller blade 191. It is preferable that the lug bar 116 provided in this way is provided toward the gearbox 110 to block weeds from being wound around the output end of the gearbox 110.
  • the lug bars 116 as described above are provided on both sides of the gear box 110, and the lug bars 116 on both sides of the gear box 110 are provided symmetrically by 180 degrees to each other. In this way, if the lug bars 116 on both sides of the gearbox 110 are provided symmetrically by 180 degrees, the balance can be maintained during rotation of the main shaft 111, and when the balance of the main shaft 111 is maintained, vibration and operation noise can be reduced.
  • the gear box 110 as described above is provided to be mounted on and detached from the quick attachment 200 by the mounting box 130, the mounting box 130 is hinged to the upper portion of the mounting frame 113 is provided.
  • Such a mounting box 130 is hinged to the front and rear hinge parts of the gearbox 110, respectively, and the front hinge part of the gearbox 110 is configured at the front end of the input shaft 121, and the gearbox 110
  • the rear hinge portion of is composed of the rear end of the mounting frame (113).
  • the front hinge of the gearbox 110 includes a hinge bushing 123 rotatably coupled to the front end of the input shaft 121 via a bearing 122, and the outer surface of the hinge bushing 123 will be described later.
  • the front hinge plate 131 of the mounting box 130 to be is inserted and hinged.
  • the rear hinge portion of the gearbox 110 includes a plurality of hinge plates 114 formed on the upper surface of the rear end of the mounting frame 113, and the hinge plate 114 has a pair of holes 114a forming a triangle It is provided to be spaced apart in the state. Between the plurality of hinge plates 114, a rear hinge plate 132 of the mounting box 130, which will be described later, is inserted and hinged.
  • the rotavator 100 is coupled and fixed to the quick attachment 200, and rolling is performed in which the left and right sides are rotated up and down based on the front and rear hinge parts of the mounting box 130 to be described later, and the rotor by rolling
  • the baiter 100 is always able to plow the farmland regardless of the smoothness of the farmland while remaining level.
  • the farmland below the gearbox 110 has uncultivated land W that is not cultivated as much as the width of the gearbox 110 as shown in FIG. will do
  • the lower surface of the gearbox 110 is provided with a plow protrusion 115 protruding downward as shown in FIGS. ) will be excavated.
  • the soil of the farmland is moved to the lower center of the rotavator 100, that is, the lower part of the gearbox 110, by the plowing operation of the tiller blades rotated on both sides of the gearbox 110.
  • This is accumulated, and the plow protrusion 115 disperses the accumulated soil and at the same time removes weeds from the uncultivated land (W).
  • the mounting box 130 is hinged and provided.
  • the mounting box 130 includes a cover portion 130a covering the upper surface of the gearbox 110, that is, the power transmission unit 120, and the quick attachment 200 of the tractor.
  • a “ ⁇ ” shaped extension 130b extending downward from one end of the adjacent cover 130a is included.
  • the upper hook 211 and the lower hook 221 of the quick attachment 200 are hooked and coupled to the cover part 130a and the extension part 130b 133 ) 134 is provided.
  • the upper mounting pin 133 is formed to be fixed to the upper surface of the cover part 130a, and the upper hook 211 of the quick attachment 200 is coupled, and the lower mounting pin 134 is both extension parts 130b ) Is formed to be fixed to the lower end of the quick attachment 200 of the lower hook 221 is coupled.
  • the upper hook 211 and the lower hook 221 coupled to the upper and lower mounting pins 133 and 134 are formed in a hook shape, and the openings of the upper and lower hooks 211 and 221 face each other.
  • the openings of the upper and lower hooks 211 and 221 face each other.
  • front and rear hinge parts hinged to the front and rear hinge parts of the gearbox 110 are provided on the cover part 130a of the mounting box 130 .
  • the front hinge part of the mounting box 130 includes a front hinge plate 131 protruding downward from the front end of the lower surface of the cover part 130a, and the hinge bushing 123 of the input shaft 121 is included in the front hinge plate 131 Through-holes 131a through which this penetration is coupled are formed.
  • the hinge bushing 123 penetrated and coupled to the through hole 131a of the front hinge plate 131 is provided to rotate (rotate) in place in the front hinge plate 131 .
  • the front hinge plate 131 may be provided with a front coupling plate and a rear pipe, in which case the front coupling plate is coupled to the outer ring of the bearing interposed between the input shaft 121 and the hinge bushing 123. It may be, and the rear pipe portion may be fitted to the outer surface of the hinge bushing 123.
  • the rear hinge part of the mounting box 130 includes a rear hinge plate 132 protruding downward from the rear end of the lower surface of the cover part 130a, and the rear hinge plate 132 has one stop hole 132a and A plurality of long holes 132b are formed in a triangular shape.
  • the stop hole 132a is formed on the upper part of the rear hinge plate 132, and the plurality of long holes 132b are formed at the lower part of the rear hinge plate 132 to be spaced apart on the same line and vertically long.
  • the coupling pins are coupled to both long holes 132b of the rear hinge plate 132, respectively, and the coupling pins pass through the long holes 132b and the lower coupling hole formed as a regular hole in the hinge plate 114 of the gearbox 110 ( 114a) is provided to be through-coupled.
  • the gearbox 110 that is, the rotavator 100 is provided to be rolled up and down as much as the vertical length of the long hole 132b in the mounting box 130, and the rotavator 100 to be rolled will always remain horizontal to farmland. be able to
  • a coupling pin is selectively coupled to the stop hole 132a of the rear hinge plate 132.
  • the coupling pin is also penetrated into the upper coupling hole 114a formed as a regular hole in the hinge plate 114 of the gearbox 110 while passing through the stop hole 132a, thereby fixing the rotator 100 to the mounting box 130 This will block rolling. In this way, in a state in which rolling of the rotavator 100 is blocked, the tractor can be safely moved.
  • a plurality of shock absorbers 140 for buffering the rolling of the rotator 100 are provided on both sides, respectively.
  • the shock absorber 140 includes a cylinder body 140a to which hydraulic pressure acts therein, and a rod 140b provided to enter and exit from one end of the cylinder body 140a.
  • the lower end of the cylinder body 140a is hinged to the lower end of the extension part 130b of the mounting box 130, and the rod 140b coming in and out from the upper end of the cylinder body 140a has its front end (upper end) gearbox It is hinged to the mounting frame 113 of (110).
  • the cylinder body 140a is positioned lower and coupled to the lower end of the extension 130b of the mounting box 130, and the rod 140b is positioned upward and illustrated a structure coupled to the mounting frame 113 of the gearbox 110, which is a cylinder body ( 140a), and as damage to the rod 140b is prevented, malfunction of the shock absorber 140 can be prevented.
  • the rear surface of the extension part 130b of the mounting box 130 (the surface facing the rotator 100) blocks foreign matter bouncing toward the shock absorber 140 during plowing work by the rotator 100 to prevent foreign matter from A guard 141 protecting the shock absorber 140 is provided.
  • the guard 141 is not only formed of a plate having an area sufficient to cover the rear surface of the shock absorber 140, but may also be inclined to correspond to the inclination of the shock absorber 140. In this way, when the guard 141 is inclined to correspond to the shock absorber 140, the maximum area for covering the shock absorber 140 compared to the same area is secured, so the shock absorber 140 can be more safely protected.
  • the rotavator 100 of the central driving type according to the present invention as described above is connected to the quick attachment 200 at the rear of the tractor 1 in a state in which power transmission is possible.
  • connection of the rotavator 100 is performed by using the three-point link of the tractor 1 to open the gap between the upper hook 211 and the lower hook 221 of the quick attachment 200, both lower hooks 221 After rotating and coupling from bottom to top to the lower mounting pin 134 provided in the mounting box 130 of the rotavator 100, the upper hook 211 is attached to the upper mounting pin 133 of the mounting box 130.
  • Rotator 100 is a quick attachment ( 200) and coupled while being positioned.
  • the power transmission unit 230 of the quick attachment 200 is provided in the power transmission unit 120 of the gearbox 110 in the process of the rotavator 100 being positioned in the quick attachment 200 Input shaft 121 ) and combined in the form of a dog clutch to enable power transmission.
  • the rotavator 100 receives the power of the tractor 1 through the power transmission unit 120 coupled with the power transmission unit 230 of the tractor 1.
  • the transmitted power is input to the input shaft 121 of the power transmission unit 120 configured on the upper part of the gearbox 110, and the input power is the first sprocket wheel connected to the input shaft 121 ( 124) is transmitted to the second sprocket wheel 112, and the power transmitted to the second sprocket wheel 112 is output through main shafts 111 provided on both sides of the second sprocket wheel 112, respectively.
  • the gearbox 110 is provided in the center of the rotavator 100 as described above, it is operated in a state where both left and right sides are always kept horizontal around the gearbox 110, so that farmland can be plowed evenly. do.
  • the rotavator 100 is rolled up and down by the length of the long hole 132b in the mounting box 130, in which the gearbox 110 equipped therewith is attached and fixed to the quick attachment 200 of the tractor. Regardless of the smoothness of the farmland, it can always be cultivated in a state that is kept level with the farmland.
  • tractor 10 upper link
  • gearbox 111 main shaft
  • hinge plate 114a coupling hole
  • bearing 123 hinge bushing
  • extension 131 front hinge plate

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  • Life Sciences & Earth Sciences (AREA)
  • Zoology (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Agricultural Machines (AREA)
  • Soil Working Implements (AREA)

Abstract

La présente invention concerne une structure de raccordement de machine de travail agricole de type à entraînement central, la structure de raccordement de machine de travail agricole étant raccordée à un tracteur agricole de manière à permettre une transmission de puissance. L'invention concerne une structure de raccordement de machine de travail agricole dans laquelle une machine de travail agricole est pourvue d'une boîte de montage qui a des broches de montage sur ses parties supérieure et inférieure.
PCT/KR2022/018963 2021-12-28 2022-11-28 Structure de raccordement de machine de travail agricole de type à entraînement central WO2023128314A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020210189749A KR102435093B1 (ko) 2021-12-28 2021-12-28 중앙 구동방식의 농업용 작업기 연결구조
KR10-2021-0189749 2021-12-28

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WO2023128314A1 true WO2023128314A1 (fr) 2023-07-06

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PCT/KR2022/018963 WO2023128314A1 (fr) 2021-12-28 2022-11-28 Structure de raccordement de machine de travail agricole de type à entraînement central

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102435093B1 (ko) * 2021-12-28 2022-08-24 로보드림 주식회사 중앙 구동방식의 농업용 작업기 연결구조

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003250303A (ja) * 2002-03-04 2003-09-09 Kubota Corp 対地作業機及び対地作業機による作業方法
JP2005073629A (ja) * 2003-09-02 2005-03-24 Mitsubishi Agricult Mach Co Ltd 作業機連結装置
KR20100085521A (ko) * 2009-01-21 2010-07-29 주식회사 세웅 트랙터용 작업기에의 동력연결 장치
KR101532596B1 (ko) * 2013-07-10 2015-07-01 대호 (주) 트랙터 후방에 작업기를 설치하기 위한 연결장치
KR102435093B1 (ko) * 2021-12-28 2022-08-24 로보드림 주식회사 중앙 구동방식의 농업용 작업기 연결구조

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200492282Y1 (ko) 2019-12-18 2020-09-10 최낙우 로터베이터

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003250303A (ja) * 2002-03-04 2003-09-09 Kubota Corp 対地作業機及び対地作業機による作業方法
JP2005073629A (ja) * 2003-09-02 2005-03-24 Mitsubishi Agricult Mach Co Ltd 作業機連結装置
KR20100085521A (ko) * 2009-01-21 2010-07-29 주식회사 세웅 트랙터용 작업기에의 동력연결 장치
KR101532596B1 (ko) * 2013-07-10 2015-07-01 대호 (주) 트랙터 후방에 작업기를 설치하기 위한 연결장치
KR102435093B1 (ko) * 2021-12-28 2022-08-24 로보드림 주식회사 중앙 구동방식의 농업용 작업기 연결구조

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