WO2015026036A1 - 전선 포설용 이송장치 - Google Patents

전선 포설용 이송장치 Download PDF

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Publication number
WO2015026036A1
WO2015026036A1 PCT/KR2014/002775 KR2014002775W WO2015026036A1 WO 2015026036 A1 WO2015026036 A1 WO 2015026036A1 KR 2014002775 W KR2014002775 W KR 2014002775W WO 2015026036 A1 WO2015026036 A1 WO 2015026036A1
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WO
WIPO (PCT)
Prior art keywords
wire
link
laying
present
wires
Prior art date
Application number
PCT/KR2014/002775
Other languages
English (en)
French (fr)
Korean (ko)
Inventor
김동호
김정민
서재원
정동현
김동수
박주이
김수호
박희환
임창호
이동준
Original Assignee
대우조선해양 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
Priority claimed from KR20130098981A external-priority patent/KR20150022042A/ko
Priority claimed from KR1020130113726A external-priority patent/KR101658946B1/ko
Priority claimed from KR1020130114512A external-priority patent/KR101451949B1/ko
Priority claimed from KR1020130114525A external-priority patent/KR101684609B1/ko
Application filed by 대우조선해양 주식회사 filed Critical 대우조선해양 주식회사
Priority to SG11201600796WA priority Critical patent/SG11201600796WA/en
Publication of WO2015026036A1 publication Critical patent/WO2015026036A1/ko

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle

Definitions

  • the present invention relates to an apparatus for laying wires, and more particularly, to an apparatus for laying wires, installed in a predetermined path by pulling an electric wire from a cable tray of a ship.
  • the installation of the multi-core coated wire is a task that requires a lot of personnel input, but the efficiency is gradually increased with the introduction of various installation automation devices. Nevertheless, the wire laying work for cable trays installed in narrow spaces such as ships and offshore plants still depends on manual labor, which requires a large number of workers and causes musculoskeletal disorders.
  • Legendary installation devices include electric / engine / pneumatic winch spreaders, roller / tracking / ball pullers and feeders, and robots for towing guide ropes.
  • Most of the devices described above, however, are heavy and large in size and are suitable for use in large, wide converters. Therefore, it is difficult to apply to a converter that has a narrow working space or runs perpendicular to the curve.
  • Korean Patent Publication No. 1086385 has a large labor drum and a crimping portion, and thus a large labor force is required for the installation of a narrow converter or a long distance converter including a plurality of straight lines and curves. Will cost.
  • Korean Patent Publication No. 1205921 it is difficult to install in a narrow space because the overall length including the towing unit is long.
  • An object of the present invention for improving the conventional problems as described above, is installed in the structure of the light and thin at the time of laying the cable tray installed in the narrow position of the ship and offshore plant to reduce the number of installation work and time
  • the present invention provides a transport apparatus for laying cables that can be reduced.
  • Still another object of the present invention is to simplify installation and dismantling as well as to increase reliability and durability as well as to flexibly respond to changes in cable diameter.
  • the present invention is a device for transporting and laying wires on a converter provided with a plurality of trays, at least one is provided in the converter, the drive to form the installation force of the wire in the reciprocating motion of the actuator And gripping means for holding the electric wire and cooperating with the driving means to transfer the installation force to the electric wire, and control means for distributing control of the gripping means and the driving means to a unit controller and a central controller.
  • the actuator of the drive means is adjusted the operation timing by a switch, a control valve, a time delay valve.
  • the unit controller of the control means controls the gripping means and the driving means arranged in the allocated area of the tray to be synchronized so that the wires are laid.
  • the gripper in the device for applying the installation force to transfer the electric wire on the set path, the gripper to grip the electric wire in conjunction with the linkage and the moving body having a link movable in the forward and backward direction of the electric wire
  • the genie is characterized by including a holding means.
  • the link of the moving body transfers the installation force to the electric wire in conjunction with the electric wire only in one direction of movement.
  • the hinge shaft for connecting the moving body and the link is provided detachably via at least one of the split pin, snap ring, screw, key.
  • the moving body and the link are interposed between the stopper to limit the forward and backward movement range.
  • auxiliary tool based on the roller to reduce the frictional resistance during the installation of the wire.
  • the base having a hinge axis, rotatably installed on the hinge axis of the base, the link having a wire rope to bind the wire and the reciprocating of the link It characterized in that it comprises an actuator coupled to induce exercise.
  • the link is provided with a friction shoe to apply a one-way sliding resistance to the wire.
  • the link is provided with a fixing groove and a ball pocket for supporting the wire rope.
  • the converter when the converter is narrow or when a long distance converter is installed in a straight line and a curve, several units can be operated in cooperation to reduce the time required for the process while minimizing the input of personnel.
  • FIG. 1 is a configuration diagram showing a laying system according to the present invention
  • FIG. 2 is a block diagram showing the connection of the main part of the system of Figure 1,
  • FIG. 3 is a block diagram showing the driving means and the control means of FIG.
  • FIG. 4 is a block diagram showing a laying apparatus according to the present invention.
  • FIG. 5 is a schematic diagram showing the main parts of FIG. 4;
  • FIG. 6 and 7 are schematic views showing the operating state of FIG.
  • FIG. 8 is an exploded perspective view illustrating a gripper for wire laying according to the present invention.
  • 9 to 12 is a configuration diagram showing a gripper operating state of FIG.
  • FIG. 13 is a perspective view showing another example of the gripper for wire installation according to the present invention.
  • the converter is configured to include a horizontal tray 110, a vertical tray 120, a corner tray 130.
  • converters are either narrow or formed into long lengths containing a number of straight lines and curves.
  • the curve converter may be configured at a number of points including the corner tray 130.
  • the holding means 300 is disposed on the converter.
  • the gripping means 300 automatically performs gripping and gripping release during the reciprocating motion of the driving means 400 which will be described later.
  • Introduction of the holding means 300 is due to the ease of installation in a narrow converter.
  • Conventional winch laying machine is mainly used to install a thick power line in a straight line converter.
  • rollers and the like are mainly used to reduce friction due to the friction between the cable and the converter. Nevertheless, since the wire has a very large tension, the cable is likely to be damaged.
  • the driving means 400 for pulling the electric wire in the reciprocating motion of the actuator is arranged to be synchronized with the holding means 300 at a plurality of points of the converter. Since the holding means 300 is installed in the middle of the trays 110, 120, 130, the tension applied to the wires is not large, so that the driving means 400 can be miniaturized. When the tension of the wire is large, it is also possible to collaborate with the driving means 400 and devices such as a conventional winch, puller, feeder.
  • the drive means 400 is characterized in that the switch 410, the control valve 412, the time delay valve 415 to adjust the operation timing between the actuators.
  • the drive means 400 is a pneumatic reciprocating actuator is suitable, but hydraulic cylinder, electric, engine type or the like may be used.
  • the operation of the actuator is performed by a configuration having a switch 410, a control valve 412, a time delay valve 415 as shown in FIG.
  • the switch 410 uses a lever manually operated by the operator, the control valve 412 performs a function such as start, stop, reset, time delay valve 415 is the holding means 300 and the driving means ( Set the difference between the start and stop time between the equipment consisting of 400).
  • the present invention may be attached to the holding means 300 to the actuator of the drive means 400 may take a structure in which the wire 150 is automatically advanced during the reciprocating motion.
  • the actuator can be applied not only to pneumatic but also to all actuators performing reciprocating motion. If the resistance is small in the advancing direction of the wire 150 may be replaced by a roller (not shown) instead of the holding means (300). It is also possible to increase the installation speed by using the actuator of the drive means 400 and the large winch.
  • pneumatics provides better on-site maintenance compared to electricity and eliminates malfunctions such as overloading of electric motors, even when the cable is not overloaded due to synchronous drive between multiple devices temporarily. Rather, there is a delay effect until the synchronization is automatically synchronized, that is, the maximum pressure applied to each actuator is advantageous to automatically synchronize.
  • control means 500 distributes the gripping means 300 and the driving means 400 to the unit controller 510 and the central controller 520.
  • the unit controller 510 is installed for each set area of the trays 110, 120, and 130, and the central controller 520 is connected to the plurality of unit controllers 510 at a convenient location.
  • the process logic of the present invention is distributed to the plurality of unit controllers 510 to improve the operation speed and reliability and to minimize the risk in case of abnormality.
  • the central controller 520 has a process information processing function with an external device in addition to the management function for the distributed unit controller 510.
  • the wireless controller 530 may be interposed between the unit controller 510 and the central controller 520.
  • the unit controller 510 of the control means 500 is characterized in that the holding means 300 and the driving means 400 disposed in the allocated area of the tray 110, 120, 130 It is characterized by pulling the wire 150 by tuning.
  • the gripping means 300 and the driving means 400 may be installed and the unit controller 510 may be connected to the horizontal tray 110, the vertical tray 120, and the corner tray 130. Accordingly, the wire 150 is pulled and moved at a predetermined load and speed in the horizontal, vertical, and corner portions of the converter.
  • the central controller 520 of the control means 500 calculates and displays the arrangement position of the gripping means 300 and the driving means 400 on the trays 110, 120, 130; Characterized in that.
  • the central controller 520 may calculate the arrangement of the gripping means 300, the driving means 400, and the unit controller 510 using coordinate information of the trays 110, 120, 130.
  • the calculated results are displayed on the display to help the minimum operator to deal with them quickly and accurately.
  • the cable tray 100 for supporting the wire 150 is arranged in a horizontal, vertical, curved at a narrow, complex and high position.
  • the wire laying apparatus 160 of the present invention is intended for the cable tray 100 of ships and offshore plants having a poor installation environment, but is not necessarily limited thereto.
  • the wire laying apparatus 160 of the present invention includes the main body 210, the holding means 300, the driving means 400 as a main configuration.
  • the detailed configuration will be described in detail with reference to the main configuration.
  • the moving body 210 is a structure having a link 220 that is movable in the forward and backward directions of the wire 150.
  • the moving body 210 is based on a frame for fixing to the cable tray 100, and accommodates the link 220 on the frame to enable forward and backward movement.
  • the 'forward and backward' motion is a direction in which the wire 150 is laid, which means that the cable tray 100 includes all of the horizontal, vertical, and curved directions.
  • the forward and backward motion of the link 220 is not necessarily limited to the linear motion and includes a rotational motion.
  • the link 220 of the moving body 210 is characterized in that it moves along with the wire 150 only in one direction movement. Therefore, the link 220 may move along with the wire by the action of the frictional force on the wire during the forward movement, and may reverse back separately from the wire during the backward movement.
  • the link 220 when attaching to the driving means 400 by turning the moving body 210 reversely, by applying a friction force to the electric wire during the backward movement, the electric wire can be reversed, and the forward movement separately from the electric wire 150.
  • the link 220 repeatedly performs forward and backward movements on the moving body 210, for example, a friction force is applied to the wire 150 only when moving forward, thereby applying the laying force.
  • This one-way laying force is performed by a simple mechanical mechanism as described below, which is a simplification of the overall configuration.
  • the hinge shaft 223 for connecting the moving body 210 and the link 220 is installed detachably via at least one of the split pin, snap ring, screw, key.
  • the link 220 is rotatably installed on the moving body 210 via the hinge shaft 223.
  • the link 220 is preferably a structure that is easy to remove.
  • the hinge shaft 223 is easily separated by a split pin, a snap ring, a screw, a key, and the like.
  • the moving body 210 and the link 220 is interposed between the stopper 225 to limit the forward and backward movement range.
  • the stopper 225 an uneven structure may be applied between the moving body 210 and the link 220.
  • the stopper 225 may be a structure that is concealed but appropriately exposed to the outside.
  • the stopper 225 may be set to the maximum allowable range of motion, not the actual range of motion of the link 220.
  • the holding means 300 is a structure having a gripper 310 to grip the wire 150 in conjunction with the link 220.
  • the gripper 310 is a main body that controls the laying force on the wire 150 together with the link 220 described above. Although one gripper 310 is applied to one link 220, a plurality of grippers 310 may be applied.
  • the driving means 400 is a structure for applying the installation force to the wire 150 by causing the movement of the link 220 and the gripper 310.
  • the forward and backward movement of the link 220 and the gripper 310 on the moving body 210 is performed by the driving means 400.
  • the laying force acts on the wire 150 only during the one-way movement of the driving means 400.
  • the drive means 400 using at least one of a hydraulic cylinder, a pneumatic cylinder, an electric actuator, the control means for generating a reciprocating motion of the drive means 400 for wire laying at a set cycle ( 500).
  • Hydraulic cylinders and pneumatic cylinders are preferably double acting, but single acting may be used.
  • the electric actuator uses a reciprocating mechanism such as a ball screw, a link, and a cam in a servo motor or a linear motor.
  • all well-known reciprocating apparatuses such as an engine type, can be used.
  • the control means 500 is applied to the circuit configuration differently according to the hydraulic method and the electric method.
  • control means 500 may generate a reciprocating motion in the driving means 400 at an arbitrary operating cycle through the valve of the flow control and time delay function in the case of the hydraulic pressure method.
  • the pneumatic control means 500 operates the pneumatic cylinder of the drive means 400 by a start valve, a main valve, a time delay valve, or the like.
  • the pneumatic control means 500 is preferred in that it does not require synchronization by electrical control and is not affected by the external environment.
  • the start valve when the start valve is opened, air is supplied to the pneumatic cylinder through the main valve, the forward movement of the link 220 is performed, and at the same time, it is delivered to the time delay valve) and waits until the predetermined pressure is reached. It acts to induce the backward movement of the pneumatic cylinder.
  • the timing (period) of the time limit operation in which the main valve and the link 220 operate is determined by the flow rate control and the time delay function by the time delay valve.
  • a plurality of wire laying devices 160 when a plurality of wire laying devices 160 are arranged in a pneumatic manner, they may not necessarily be synchronized with each other.
  • the control unit 500 when an overload occurs due to a timing mismatch in the wire laying apparatus 160 on one side, the control unit 500 returns to a state in which the flow rate of the air remaining in the control unit 500 does not operate due to time delay, and the adjacent wires in the next cycle. It is automatically synchronized with the installation device 160 to operate when the force is maximized. Of course, if the overload does not occur, it can operate even when the synchronization is not performed.
  • auxiliary tool 480 based on the roller to reduce the frictional resistance when the wire 150 is laid.
  • the assisting tool 480 is mainly installed at the start, the end, the horizontal and vertical path intersection of the cable tray 100, the curved portion, the partition wall through the metal to assist the movement of the wire 150. That is, when the auxiliary tool 480 is installed, the load that the wire laying device 160 bears during the laying process is reduced.
  • the assisting tool 480 includes one or a plurality of supporting rollers in multiple directions.
  • the tray clamp which means all brackets required for installing the wire laying apparatus 160 in the cable tray 100.
  • the tray clamp is configured in such a way that the tray clamp can be installed regardless of the size and width of the cable tray 100.
  • the tray clamp includes the wire laying device 160 therein, and fixes the wire laying device 160 inside and outside the tray.
  • FIG. 6 is a state in which the link 220 is inclined backward with the gripper 310 while advancing to apply sliding force to the wire 150 to maximize sliding friction force
  • FIG. 7 shows the link 220. Since the back is inclined forward with the gripper 310 and the sliding friction is lost, the wire 150 is positioned as it is.
  • the front tilt and back tilt of the link 220 are caused by the angle limitation of the stopper 225 described above and before.
  • the gripping means 300 may be changed in the direction of application of the installation force when moving forward and backward.
  • the material of the front and rear of the link 220 and the gripper 310 is different or a separate friction shoe (not shown) in front of the link 220 Can be added further.
  • the sliding frictional force acting on the wire 150 varies depending on the material of the friction shoe, the attachment height, and the like.
  • the wire laying device 160 of the present invention when the wire laying device 160 of the present invention is disposed in the vertical path of the cable tray 100 can be used for preventing the wire drop prevention device consisting of the moving body 210 and the holding means 300 of FIG.
  • the wire drop preventing device serves as a brake to prevent the wire 150 from falling by its own weight.
  • the device for preventing the wire laying may have the same effect by using a plurality of wire laying devices 160.
  • Wire 150 is a large diameter, heavier weight heavyweights, but is not limited thereto.
  • a structure provided with a base 211 having a hinge axis (223).
  • the base 211 is bolted to the actuator 450 as a portion supporting the link 220 to be described later.
  • Hinge shaft 223 for binding the link 220 to the base 211 is installed in a structure that is easy to remove using a snap pin.
  • the link 220 having the wire rope 320 to bind the wire 150 is rotatably installed on the hinge shaft 223 of the base 211.
  • the link 220 has a semicircular structure with an open upper side, and is coupled to the hinge shaft 223 of the base 211 at the lower side.
  • the wire rope 320 uses steel or fiber material and has a coating in a predetermined section to increase frictional force with the wire 150.
  • the actuator 450 is a structure including an actuator 450 coupled to cause the reciprocating motion of the link 220.
  • the actuator 450 may use a pneumatic cylinder, a hydraulic cylinder, a linear motor and the like. According to the main drawing of the present invention illustrates a state in which the operating cylinder 455 is mounted on the housing 452.
  • the base 211 is characterized in that it comprises a stopper 225 to limit the range of motion of the link 220.
  • the stopper 225 is formed in the shape of a groove or a protrusion in a portion of the base 211 proximate to the link 220.
  • the stopper 225 induces the link 220 to rotate within a predetermined angle around the vertical line during the wire laying process.
  • the wire rope 320 of the link 220 is characterized in that it comprises a plurality of spheres 321 to adjust the binding length.
  • the sphere 321 is connected to have a certain gap in a certain section of the wire rope 320.
  • the gap of the sphere 321 is for inserting and binding to one side cutout of the link 220.
  • the diameter of the sphere 321 is an element that determines the binding length (diameter) of the wire rope 320 in response to the thickness change of the electric wire 150.
  • the link 220 is characterized in that it comprises a ball plunger 323 to support the wire rope 320.
  • the ball plunger 323 is composed of a ball and a spring received in the groove of the link 220 to restrain the arbitrary departure of the wire rope 320 with the elastic force acting on the ball.
  • the ball of the ball plunger 323 does not need to be a sphere as a whole, but may be formed to have a hemisphere in a part.
  • the link 220 is characterized in that it further comprises a friction shoe 325 to act as one-way sliding resistance to the wire 150.
  • the friction shoe 325 may be coupled to one surface of the link 220 to exert a frictional resistance on the coating of the wire 150.
  • the friction shoe 325 is in contact with the wire 150 in a portion of the rotation range of the link 220.
  • the friction shoe 325 is also installed in a replaceable structure corresponding to the size of the wire 150.
  • the gripper of the present invention is fixed to the area of the cable tray in which the wire 150 is to be installed, hydraulic, pneumatic, electrical, etc. are opened, and the wire rope 320 is opened.
  • the wire 150 is seated on the link 220, the wire rope 320 is inserted into the link 220 to bind the wire 150, and the actuator 450 is operated at a set cycle.
  • the wire rope 320 is inclined backward and the friction shoe 325 contacts the wire 150 to advance the wire 150 with sliding frictional resistance, and FIG. 10.
  • the wire rope 320 is inclined forward and the contact between the friction shoe 325 and the wire 150 is released. 150 maintains the current position by losing the frictional resistance, and the wire rope 320 starts to tilt backward when the operation cylinder 455 starts moving forward as shown in FIG.
  • the present invention converts the energy due to the linear movement of the actuator 450 into energy for gripping the wire 150.
  • the gripper-type wire laying device can be implemented in a light and thin structure, so it is suitable for a horizontal, vertical, and curved arrangement in a narrow, high, and deep position like a cable tray of a ship.
  • the gripper pulls by applying a friction force in one direction while performing the forward and backward movement in the direction of movement of the wire.
  • Base 211 is coupled to a pneumatic cylinder (not shown) to provide a pulling force for the wire while performing the forward and backward movement.
  • the link 220 is installed on the base 211 via a hinge shaft 223.
  • the link 220 is formed in a semicircular cross section for supporting the lower side of the wire.
  • the link 220 is connected to the base 211 via a hinge shaft 223 to perform a rotational movement forward and backward in a set angle range.
  • the link 220 has a rear tilt angle at the moment of pulling the wire in the forward motion than the forward tilt angle at the moment of sliding the wire in the backward motion.
  • the front surface of the link 220 may be attached to the friction shoe 325 to increase the friction force on the wire.
  • the friction shoe 325 is in close contact with the electric wire only when the rear side is inclined by the forward movement of the link 220, and thus the friction force is increased by the pressing force.
  • the link 220 is characterized in that it comprises a fixing groove 231 and the ball pocket 235 for supporting the wire rope 320.
  • the fixing groove 231 closely supports one end of the wire rope 320, and the ball pocket 235 easily supports the other end of the wire rope 320 in a detachable manner.
  • the fastening groove 233 is formed around the fixing groove 231 and the split pins 318 are coupled to prevent the arbitrary detachment of the wire rope 320.
  • the ball pocket 235 is formed in a hemispherical shape to closely receive one of the spheres 321 of the wire rope 320. Accordingly, the wire rope 320 is maintained in a tightly coupled state by the ball pocket 235 while the link 220 is advanced in the rearward inclined state.
  • the wire is placed on the link 220 in the state where the other end of the wire rope 320 is dismantled, and the gap of the sphere 321 is opened at the other end of the wire rope 320 to fix the groove of the link 220 ( 231 and the ball pocket 235, the lower sphere 321 is seated on the lower ball pocket 235, the upper sphere 321 is seated in the fixing groove 231. Then, when the base 211 is operated to cause the forward and backward movement of the link 220, the wire is pulled in one direction by the wire rope 320, the link 220, and the friction shoe 325.

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  • Electric Cable Installation (AREA)
  • Mechanical Control Devices (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
PCT/KR2014/002775 2013-08-21 2014-04-01 전선 포설용 이송장치 WO2015026036A1 (ko)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SG11201600796WA SG11201600796WA (en) 2013-08-21 2014-04-01 Transport device for laying power lines

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
KR10-2013-0098981 2013-08-21
KR20130098981A KR20150022042A (ko) 2013-08-21 2013-08-21 케이블 포설 시스템
KR1020130113726A KR101658946B1 (ko) 2013-09-25 2013-09-25 와이어 로프를 이용한 전선포설 장치
KR10-2013-0113726 2013-09-25
KR10-2013-0114512 2013-09-26
KR10-2013-0114525 2013-09-26
KR1020130114512A KR101451949B1 (ko) 2013-09-26 2013-09-26 그리핑 방식의 전선포설 장치
KR1020130114525A KR101684609B1 (ko) 2013-09-26 2013-09-26 전선포설용 그리퍼

Publications (1)

Publication Number Publication Date
WO2015026036A1 true WO2015026036A1 (ko) 2015-02-26

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Application Number Title Priority Date Filing Date
PCT/KR2014/002775 WO2015026036A1 (ko) 2013-08-21 2014-04-01 전선 포설용 이송장치

Country Status (4)

Country Link
JP (1) JP5937133B2 (ja)
CN (1) CN104426092B (ja)
SG (1) SG11201600796WA (ja)
WO (1) WO2015026036A1 (ja)

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CN106099768B (zh) * 2016-08-16 2018-04-10 白银有色集团股份有限公司 室外复杂管廊桥架电缆敷设方法
CN108075395A (zh) * 2016-11-16 2018-05-25 刘伟华 电力系统野外作业便携工具
CN112448326A (zh) * 2020-11-01 2021-03-05 国网河南省电力公司卫辉市供电公司 一种电缆牵引机用电缆夹持转向装置
CN112736775A (zh) * 2020-12-03 2021-04-30 中建安装集团有限公司 一种长距离大截面高压电缆敷设的方法及装置
CN112803297B (zh) * 2021-01-21 2022-10-25 广西电网有限责任公司电力科学研究院 一种悬式绝缘子旋转装置
CN113594969B (zh) * 2021-08-24 2022-03-29 中铁九局集团电务工程有限公司 一种电缆敷设装置
KR102588182B1 (ko) * 2022-11-03 2023-10-12 (주)광명토탈엔지니어링 건축물 외부 설치형 통신케이블 트레이 구조

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JP5937133B2 (ja) 2016-06-22

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