WO2022014785A1 - Moteur d'entraînement bidirectionnel de haute puissance et dispositif motorisé d'ouverture/fermeture de couvercle l'utilisant - Google Patents

Moteur d'entraînement bidirectionnel de haute puissance et dispositif motorisé d'ouverture/fermeture de couvercle l'utilisant Download PDF

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Publication number
WO2022014785A1
WO2022014785A1 PCT/KR2020/014323 KR2020014323W WO2022014785A1 WO 2022014785 A1 WO2022014785 A1 WO 2022014785A1 KR 2020014323 W KR2020014323 W KR 2020014323W WO 2022014785 A1 WO2022014785 A1 WO 2022014785A1
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WO
WIPO (PCT)
Prior art keywords
power
gear
motor
unit
commutator
Prior art date
Application number
PCT/KR2020/014323
Other languages
English (en)
Korean (ko)
Inventor
정회영
Original Assignee
정회영
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 정회영 filed Critical 정회영
Priority to CN202090001156.0U priority Critical patent/CN219041556U/zh
Publication of WO2022014785A1 publication Critical patent/WO2022014785A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/116—Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/24—Devices or systems for heating, ventilating, regulating temperature, illuminating, or watering, in greenhouses, forcing-frames, or the like
    • A01G9/241—Arrangement of opening or closing systems for windows and ventilation panels
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
    • H02K13/10—Arrangements of brushes or commutators specially adapted for improving commutation
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/60—Motors or generators having rotating armatures and rotating excitation field
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P8/00—Arrangements for controlling dynamo-electric motors rotating step by step
    • H02P8/14—Arrangements for controlling speed or speed and torque
    • H02P8/20—Arrangements for controlling speed or speed and torque characterised by bidirectional operation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/25—Greenhouse technology, e.g. cooling systems therefor

Definitions

  • the present invention relates to a high-output bidirectional driving motor and a power cladding switch using the same, and more particularly, to a high-output bidirectional driven motor in which the driving force in the forward and reverse directions is generated equally, and a separate brake device using the motor.
  • the power cover switch can be miniaturized because braking is possible without the need for braking, and the lifespan of the product is extended by adopting a structure that is waterproof from rain or condensation, and a high-power bidirectional driving motor that is easy to move and repair by the user or operator through the handle It is related to the used power cladding switchgear.
  • a greenhouse maximizes productivity by promoting the growth of various vegetables, etc., and maintains the internal temperature even in the winter season when vegetables are difficult to grow, thereby preserving the growth conditions of vegetables, thereby providing a space for continuous plant cultivation. to provide.
  • various types of heating facilities are additionally installed to actively preserve the internal temperature.
  • there is a method of inducing warmth by covering the top of a plastic house with a non-woven fabric or the like. And the covering material is wound by a power covering switchgear to open and close, and it is possible to control the internal temperature of the plastic house according to the degree of opening and closing.
  • Korean Utility Model Publication No. 20-2008-0004978 discloses a technology that can improve the productivity of reducer parts as well as dramatically reduce production costs. Disclosed is a technology capable of preventing a power clad switch from being reverse thrust.
  • the power clad switch having the structure of the reduction gear as described above requires many technologies to improve durability, and accordingly, various efforts are being made, such as improving the strength of the constituent members or changing the coupling structure, as in the prior art.
  • the present invention has been devised to solve the above problems, and an object of the present invention is to provide a high-output bidirectional driving motor capable of generating the same driving force when the motor is driven in the forward and reverse directions.
  • the present invention is to provide a high-output bi-directional driven power cladding switch, which is easy to install and repair by reducing the size.
  • the present invention is to provide a high-output bidirectional driving type power cladding switch that can be simply configured without a separate brake device by adopting an internal tooth structure capable of mechanical brake.
  • the present invention is to provide a high-output bi-directional driving power cladding switch having improved durability by applying a waterproof function.
  • the high-output bidirectional driving motor includes: a field wound in order to establish a magnetic field necessary for rotation in a space separated from a stator and a rotor; an armature for generating electric power by receiving a force as current flows in the magnetic field formed by the field; a commutator formed on one side of the armature and maintaining the direction of the current flowing in the coil; and a brush that supplies electric power in contact with the outer surface of the commutator, and supplies electric power to the commutator while being rotated at a predetermined angle in a counterclockwise direction with respect to a direction perpendicular to the magnetic field direction formed by the field winding. characterized.
  • the brush is characterized in that it is rotated counterclockwise at 11.25° to 22.5°.
  • the high-output bidirectional driving type power clad switch according to the present invention includes a field wound in order to establish a magnetic field necessary for rotational operation in a space separated from a stator and a rotor, and a current flows in the magnetic field formed by the field.
  • An armature that receives a force and rotates to produce electric power, a commutator formed on one side of the armature and maintaining the direction of the current flowing in the coil, and an outer surface of the commutator to supply power in contact with the commutator formed by the field winding
  • an AC motor unit comprising a brush that supplies power to the commutator while being rotated at a predetermined angle in a counterclockwise direction with respect to the direction perpendicular to the magnetic field direction and generates power using external power
  • a gear unit formed on one side of the motor unit and configured to reduce power generated from the motor unit
  • a winding unit formed on one side of the gear unit and connected to the gear unit to wind up the covering of the facility house using the reduced power.
  • the present invention has the advantage that the same driving force can be generated when the motor is driven in the forward and reverse directions.
  • the present invention has the advantage of being compact and easy to install and repair.
  • the present invention has the advantage that it can be configured simply without a separate brake device by adopting an internal tooth structure capable of mechanical brake.
  • the present invention has the advantage of improving durability by applying a waterproof function.
  • 1 is a view of a conventional motor.
  • FIG 3 is a perspective view of a high-output bidirectional driven power cladding switch according to an embodiment of the present invention.
  • FIG. 4 is a combined cross-sectional view of a high-output bidirectional driving type power cladding switch according to an embodiment of the present invention.
  • FIG. 5 is an exploded cross-sectional view of a high-output bidirectional driven power cladding switch according to an embodiment of the present invention.
  • FIG. 2 is a view of a high-power bidirectional driving motor according to an embodiment of the present invention
  • FIG. 3 is a perspective view of a high-output bidirectional driving type power cladding switch according to an embodiment of the present invention
  • FIG. 4 is an embodiment of the present invention 5 is an exploded cross-sectional view of a high-output bidirectional driven power cladding switchgear according to an embodiment of the present invention.
  • the high-output bidirectional driving motor 100 includes: a field 110 having a winding in order to establish a magnetic field necessary for a rotation operation in a space in which a stator and a rotor are separated; an armature 120 that receives a force as current flows in the magnetic field formed by the magnetic field 110 and rotates to produce power; a commutator 140 formed on one side of the armature 120 and maintaining the direction of the current flowing in the coil 130; and supplying power in contact with the outer surface of the commutator 140, while rotating at a predetermined angle counterclockwise with respect to the direction perpendicular to the direction of the magnetic field formed by the field winding 111, to the commutator 140 It is configured to include a brush 150 that supplies power.
  • the configuration of a motor (or electric motor) in one direction has a central shaft 160 formed around the axis, and an armature 120 (armature) is formed around the axis, and the armature 120 is a winding (or armature) that operates as a main operation in a rotating electric machine. (120) winding) is accommodated.
  • the armature 120 cuts the magnetic flux generated by the field 110 and generates torque through Fleming's left hand rule. When power is supplied to the motor (or electric motor), the motor (or electric motor) rotates, and the place where the current of the power flows is the armature 120 .
  • a commutator 140 receiving power is formed on one side of the armature 120 .
  • the commutator 140 is a device for supplying the armature 120 by periodically changing the direction of the current so as to rotate in a predetermined direction in the DC or AC commutator 140 motor.
  • the brush 150 is a conductor serving as a contactor when connecting a stationary part (stator, etc.) with a rotor in an electric motor or a generator.
  • bearings may be placed on both sides of the shaft for ease of rotation.
  • a field magnet 110 having a shape partially surrounding the armature 120 is formed.
  • the field 110 is responsible for generating magnetic flux, and interacts with the armature 120 to construct a magnetic circuit.
  • the armature 120 receives the magnetic flux created by the field 110 to obtain rotational force. Since it only needs to generate the required magnetic flux, a relatively small current flows than the armature 120 , and a permanent magnet or an electromagnet is used to create the magnetic flux. If a permanent magnet is used, magnetic flux can be created without a separate winding, but speed control can be difficult because the magnetic flux cannot be controlled.
  • the motor 100 configured as described above rotates when electricity is supplied to generate power. At this time, in order to rotate the motor 100 in the opposite direction, if electricity is supplied in the opposite direction during operation, the rotation continues in the rotating direction, and when electricity is supplied in the opposite direction while the motor 100 is completely stopped The motor 100 rotates in the opposite direction. In this case, rotation is possible, but sparks are generated and the life of the motor 100 is shortened.
  • the brush 150 supplying power to the commutator 140 changes the direction in which electricity is supplied. It becomes a possible motor 100 .
  • the commutator 140 in a state in which the brush 150 supplying power to the commutator 140 is rotated at a constant angle with respect to the direction perpendicular to the magnetic field direction formed by the field winding 111, the commutator 140 ) is configured to supply electric power, and to be described in more detail, the brush 150 is rotated at a constant angle in a counterclockwise direction with respect to the direction perpendicular to the magnetic field direction formed by the field winding 111 . In this state, power is supplied to the commutator 140 .
  • the brush 150 when the brush 150 is positioned perpendicular to the direction of the magnetic field formed by the field winding 111 and power is supplied, the maximum force can be exerted when driving in the forward direction, but when driving in the reverse direction While driving with sparks without exerting force, the lifespan of the motor 100 is shortened, and eventually the motor 100 needs to be replaced.
  • an imbalance in force occurs during forward and reverse driving.
  • the brush 150 is positioned in a direction perpendicular to the direction of the magnetic field formed by the field winding 111 to supply power, but rotates at a predetermined angle counterclockwise with respect to the vertical direction. If electric power is supplied to the commutator 140 in this state, even if the motor 100 rotates in the forward direction as well as in the reverse direction, there is no problem such as spark generation, and power is stably generated. And the power generated during forward and reverse driving is almost the same.
  • the brush 150 is rotated counterclockwise at 11.25° to 22.5° with respect to the direction perpendicular to the direction of the magnetic field formed by the field winding 111 .
  • the high-output bidirectional driving type power clad switch 200 is a magnetic field 110 having a winding in order to establish a magnetic field necessary for a rotation operation in a space separated from a stator and a rotor.
  • the armature 120 that receives a force as current flows in the magnetic field formed by the magnetic field 110 and rotates to produce electric power, and is formed on one side of the armature 120 and flows in the coil 130 .
  • the commutator 140 maintains the direction of the current, and power is supplied in contact with the outer surface of the commutator 140, and is constant in the counterclockwise direction with respect to the direction perpendicular to the direction of the magnetic field formed by the field winding 111.
  • AC motor unit 210 for generating power by using external power, consisting of a brush 150 for supplying power to the commutator 140 in a state rotated at an angle; a gear unit 220 formed on one side of the AC motor unit 210 and decelerating the power generated in the AC motor unit 210; A winding unit 230 formed on one side of the gear unit 220 and connected to the gear unit 220 to wind up the covering of the facility house using the reduced power.
  • the AC motor unit 210 receives power from the outside to generate power, and uses the generated power to wind up the covering. ) is preferred.
  • the AC motor unit 210 includes a motor 100 driven by external power, and a motor plate 211 coupled to the front surface of the motor 100 to couple the motor 100 to one side of the gear unit 220 . ) and a motor cover 212 that protects the motor 100 from external factors.
  • a universal motor is used for the above driving. Compared to the conventionally commonly used AC or DC motor, it is possible to exert a large output, while its small size makes it easy to miniaturize the power clad switch 200 .
  • the motor plate 211 is provided with a hole fastened to the gear unit 220 and a hole fastened to the motor 100 so that the motor plate 211 is fastened to the gear unit 220 in a state where the motor plate 211 is fastened to the gear unit 220 . Only (100) can be separated. Due to this, it is easy to repair or replace the motor 100, as well as to repair or replace the gear unit 220 in a state in which the motor 100 is safely separated.
  • the gear unit 220 rotates in a state in which a plurality of gears are meshed with each other.
  • the power supplied by the AC motor unit 210 is taken over and the gears rotate while decelerating or stopping the power according to a preset condition.
  • the gear unit 220 has an external shape that can be installed on the top of the plastic house first, and a gear body 221 having a storage space 228 for storing a plurality of gears therein, and a front surface of the gear body 221 .
  • a front cover 222 that is installed in and blocks the front of the storage space 228 from the outside, and a rear cover 223 that is installed on the rear surface of the gear body 221 to block the rear of the storage space 228 from the outside. is composed of
  • a partition wall 224 is formed in the gear body 221 to bisect the space in which the gear is accommodated, and one side of the space divided by the partition wall 224 transmits power from the AC motor unit 210 . It is used as a receiving unit and the other side is configured to be used as a deceleration unit that decelerates the supplied power.
  • the rear cover 223 is closely coupled to the rear surface of the AC motor unit 210 (or the motor plate 211), and the gasket 240 is inserted along the circumference of the supply unit to generate rain or condensation from the outside. Prevents the gear from being corroded by penetrating into the supply part.
  • the gear unit 220 includes a supply gear 225 that first receives the power of the motor 100 in the gear body 221 , a reduction gear 226 for decelerating the power, and the supply gear 225 and the reduction gear 226 . ) is composed of a main gear 227 connecting the.
  • the supply gear 225 is installed at a position close to the motor 100 to receive power from the motor 100 .
  • the reduction gear 226 includes two internal gears installed on the inner periphery of the reduction part, and a plurality of helical gears 226-3 rotating along the teeth of the internal gear.
  • the internal gear consists of a fixed internal gear 226-1 and a rotary internal gear 226-2 and is installed in the reduction unit.
  • the fixed internal gear 226-1 is fixed to the reduction unit to induce smooth rotation of the helical gear 226-3
  • the rotating internal gear 226-2 is a front surface of the fixed internal gear 226-1. It is a structure in which rotation is made together with the helical gear 226-3 in a state closely arranged to the .
  • the front cover 222 which is one of the most important features claimed in the present invention, is installed on the cross section of the rotary internal gear 226-2.
  • the front cover 222 has a shape corresponding to the inner space of the reduction unit, and when the front cover 222 is installed on the rotary internal gear 226-2, it completely shields the inner space of the reduction unit from the outside.
  • the winding unit 230 is disassembled from the gear unit 220 for repair or replacement of the winding unit 230. Even so, it is possible to prevent separation of the reduction gear 226 by the presence of the front cover 222, and to block rain or dew condensation entering the reduction part.
  • the front cover 222 makes it possible to freely separate the winding unit 230 from the gear unit 220 to facilitate repair and replacement work.
  • the winding part 230 is formed on one side of the gear part 220 and is connected to the gear part 220 to wind up the covering of the facility house using the reduced power.
  • the above facility house is an expression used to represent a plastic house, a facility gardening, a livestock house, etc., and all facilities used to block sunlight or prevent loss of heat by using a covering material are included in the facility house.
  • the power cover switch 200 can be used not only outside the facility house, but also can be used as an inner cover switch inside.
  • the covering material installed on the side of the facility house can also be opened and closed while moving the power covering switch 200 in the vertical direction. This is possible.
  • the winding unit 230 includes a winding rod (not shown) for winding a coating, a spline 231 connecting the front cover 222 and the winding rod, and a winding to arrange the spline 231 on the front side of the operation unit. Consists of a body 232 .
  • the gasket 240 is inserted along the coupling surface with the gear unit 220 to prevent rain or dew condensation generated from the outside from penetrating, thereby waterproofing the inner space of the gear unit 220.
  • the winding body 232 prevents rainwater or dew condensation from penetrating like the gasket 240 as a lidena (not shown) is further inserted into the end in which the spline 231 is accommodated. It is designed to waterproof the space. However, it is not limited to Lidena, and if necessary, a gasket or an oil seal may be used to provide waterproofing.
  • the gear unit 220 As it is installed on one side of the outer surface of the gear unit 220 and further includes a handle unit 250 to facilitate gripping when moving or repairing the gear unit 220, a worker or user can carry or move when moving or repairing. It is configured to be able to work while holding the handle 250 during repair.
  • the size of the motor 100 can be reduced by enabling bidirectional driving using a unidirectional rotary motor, and a separate brake device is not required.
  • the power clad switch 200 can be miniaturized, so installation and repair are easy.
  • a gasket 240 is inserted between each coupling surface between the AC motor unit 210 and the gear unit 220 and between the gear unit 220 and the winding unit 230 to form a waterproof function, thereby preventing corrosion and wear. It can be actively prevented to prolong the life of the product.
  • the present invention uses a high-output bidirectionally driven motor that generates the same driving force in the forward and reverse directions, and braking is possible without a separate brake device, so that the power cladding switch can be miniaturized, and rain or condensation
  • a structure that can be waterproofed from water the lifespan of the product is extended, and the user or operator can easily move and repair it through the handle, so it has great industrial applicability.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

La présente invention concerne un moteur d'entraînement bidirectionnel de haute puissance et un dispositif motorisé d'ouverture/fermeture de couvercle l'utilisant et, plus spécifiquement, un moteur d'entraînement bidirectionnel de haute puissance générant de manière égale une force d'entraînement dans le sens d'avancée et dans le sens inverse, ainsi qu'un dispositif motorisé d'ouverture/fermeture de couvercle l'utilisant, le dispositif motorisé d'ouverture/de fermeture de couvercle pouvant être miniaturisé grâce au moteur et freiner même sans disposer d'appareil séparé de freinage, tandis que la durée de vie du dispositif est prolongée par application d'une structure potentiellement imperméable à l'eau de pluie ou à la condensation et permettant à un utilisateur ou à un opérateur de déplacer et de réparer facilement le dispositif au moyen d'une pièce formant une poignée.
PCT/KR2020/014323 2020-07-14 2020-10-20 Moteur d'entraînement bidirectionnel de haute puissance et dispositif motorisé d'ouverture/fermeture de couvercle l'utilisant WO2022014785A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202090001156.0U CN219041556U (zh) 2020-07-14 2020-10-20 大功率双向驱动马达及利用其的电动覆盖物开闭机

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2020-0086491 2020-07-14
KR1020200086491A KR102282572B1 (ko) 2020-07-14 2020-07-14 고출력 양방향 구동 모터와 이를 이용한 동력피복개폐기

Publications (1)

Publication Number Publication Date
WO2022014785A1 true WO2022014785A1 (fr) 2022-01-20

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PCT/KR2020/014323 WO2022014785A1 (fr) 2020-07-14 2020-10-20 Moteur d'entraînement bidirectionnel de haute puissance et dispositif motorisé d'ouverture/fermeture de couvercle l'utilisant

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Country Link
KR (1) KR102282572B1 (fr)
CN (1) CN219041556U (fr)
WO (1) WO2022014785A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200370416Y1 (ko) * 2004-09-24 2004-12-14 주식회사 부성시스템 비닐하우스용 동력피복개폐기
JP2005295687A (ja) * 2004-03-31 2005-10-20 Ntt Data Ex Techno Corp 整流子電動機
JP2012075269A (ja) * 2010-09-29 2012-04-12 Aisin Seiki Co Ltd 回転電機
KR20160032957A (ko) * 2014-09-17 2016-03-25 (주) 보쉬전장 모터용 브러시 홀더 어셈블리
JP6258615B2 (ja) * 2013-07-12 2018-01-10 サンデンホールディングス株式会社 電動圧縮機

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080004978U (ko) 2007-04-24 2008-10-29 하영숙 변압기 무정전 교체용 이동형 연료전지차와 이를 이용한배전용 변압기 교체작업 공법
KR101169790B1 (ko) * 2010-10-20 2012-07-30 주식회사 아모텍 방수구조 워터펌프 모터

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005295687A (ja) * 2004-03-31 2005-10-20 Ntt Data Ex Techno Corp 整流子電動機
KR200370416Y1 (ko) * 2004-09-24 2004-12-14 주식회사 부성시스템 비닐하우스용 동력피복개폐기
JP2012075269A (ja) * 2010-09-29 2012-04-12 Aisin Seiki Co Ltd 回転電機
JP6258615B2 (ja) * 2013-07-12 2018-01-10 サンデンホールディングス株式会社 電動圧縮機
KR20160032957A (ko) * 2014-09-17 2016-03-25 (주) 보쉬전장 모터용 브러시 홀더 어셈블리

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CN219041556U (zh) 2023-05-16
KR102282572B1 (ko) 2021-07-27

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