KR100761203B1 - Shanghai East Door Opener of Automatic Tool Changer - Google Patents

Shanghai East Door Opener of Automatic Tool Changer Download PDF

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KR100761203B1
KR100761203B1 KR1020060114297A KR20060114297A KR100761203B1 KR 100761203 B1 KR100761203 B1 KR 100761203B1 KR 1020060114297 A KR1020060114297 A KR 1020060114297A KR 20060114297 A KR20060114297 A KR 20060114297A KR 100761203 B1 KR100761203 B1 KR 100761203B1
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South Korea
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door
opening
automatic tool
tool changer
closing
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Korean (ko)
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김동권
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두산인프라코어 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/08—Protective coverings for parts of machine tools; Splash guards
    • B23Q11/0891—Protective coverings for parts of machine tools; Splash guards arranged between the working area and the operator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/08—Protective coverings for parts of machine tools; Splash guards
    • B23Q11/0825—Relatively slidable coverings, e.g. telescopic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
    • B23Q3/155—Arrangements for automatic insertion or removal of tools, e.g. combined with manual handling
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/50—Power-operated mechanisms for wings using fluid-pressure actuators
    • E05F15/56—Power-operated mechanisms for wings using fluid-pressure actuators for horizontally-sliding wings
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/70—Power-operated mechanisms for wings with automatic actuation
    • 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
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/08—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body in connection with the locking of doors, covers, guards, or like members giving access to moving machine parts

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Auxiliary Devices For Machine Tools (AREA)

Abstract

본 발명은 자동공구교환장치의 도어개폐장치에 있어서, 개폐정도를 제어하는 제어밸브, 제어밸브의 신호에 따라 유압이 공급되는 실린더, 실런더와 연결되어 실린더의 상하이동과 함께 동작하는 상부도어 및 하부도어, 상부도어 및 상기 하부도어를 연결하는 접동링크로 구성된 것을 특징으로 하는 자동공구교환장치의 상하이동형 도어개폐장치에 관한 것이다. 본 발명에 따르면 자동공구교환장치에 있어서 도어를 상하로 분리구성하여 개폐함으로써 종래의 도어와 동일한 개폐정도를 유지하면서 개폐 소요시간을 단축하는 장점이 있다. 또한 개폐 소요시간의 단축으로 불필요한 시간을 줄임으로써 생산성 향상에 기여할 수 있다. The present invention is a door opening and closing device of the automatic tool changer, the control valve for controlling the opening and closing, the cylinder to which the hydraulic pressure is supplied in accordance with the signal of the control valve, the upper door which is connected to the cylinder and the shankdong of the cylinder and The lower door, the upper door and a sliding link connecting the lower door are related to the shanghai movable door opening and closing device of the automatic tool changer. According to the present invention, in the automatic tool changer, the door is separated and configured to open and close, thereby reducing the time required for opening and closing while maintaining the same opening and closing degree as the conventional door. In addition, it is possible to contribute to productivity improvement by reducing unnecessary time due to the shortening of opening and closing time.

Description

자동공구교환장치의 상하이동형 도어개폐장치{Up-down type device of opening and closing door in automatic tool changer}Up-down type device of opening and closing door in automatic tool changer}

도 1은 종래 도어개폐장치의 구성도,1 is a block diagram of a conventional door opening and closing device,

도 2는 종래 도어개폐장치를 상부에서본 구성도,2 is a view illustrating a conventional door opening and closing device from the top;

도 3은 본 발명인 상하이동형 도어개폐장치의 구성도,3 is a block diagram of the present invention Shanghai East door opening and closing device,

도 4는 본 발명인 상하이동형 도어개폐장치의 동작후 상태도를 나타낸다.Figure 4 shows a state diagram after operation of the present invention Shanghai East door opening and closing device.

<도면의 주요부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

2: 자동공구교환장치 10: 가공영역2: automatic tool changer 10: processing area

12: 스핀들 헤드 20: 대기영역12: spindle head 20: waiting area

25: 그리퍼암 26: 공구25: Gripper Arm 26: Tool

30: 도어 40, 120: 가이드레일30: door 40, 120: guide rail

42: 롤러 50, 130: 실린더42: roller 50, 130: cylinder

55, 135: 공급관 60, 140: 제어밸브55, 135: supply pipe 60, 140: control valve

100: 상부도어 102: 하부도어100: upper door 102: lower door

110: 접동링크 131: 작동로드110: sliding link 131: operating rod

본 발명은 자동공구교환장치의 도어를 개폐하는 장치에 관한 것으로, 더욱 구체적으로 도어를 상하 이동형으로 구성하여 도어의 열린정도는 동일하게 유지하면서 개폐시간을 단축한 상하이동형 도어개폐장치에 관한 것이다.The present invention relates to an apparatus for opening and closing a door of an automatic tool changer, and more particularly, to a shanghai-type door opening and closing device which shortens the opening and closing time while maintaining the same opening degree of the door by vertically moving the door.

도 1은 종래의 자동공구교환장치의 도어개폐장치를 상부에서 내려다 본 단면을 나타낸 것이다. 공작기계의 무인자동화시스템으로서 자동공구교환장치(2)에는, 연삭 및 절연 등의 가공을 하는 가공영역(10)이 있고, 가공중 사용되는 절삭유 등으로부터 사용하지 않는 공구(26)를 보호하기 위하여 도어(30)에 의해 분리된 공구의 대기영역(20)이 존재한다. Figure 1 shows a cross-sectional view of the door opening and closing device of the conventional automatic tool changer from the top. As an unmanned automated system for machine tools, the automatic tool changer (2) has a machining area (10) for processing such as grinding and insulation, and protects the tool (26) that is not used from cutting oil or the like used during processing. There is a waiting area 20 of the tool separated by the door 30.

대기영역(20)에 있던 공구(26)는 가공상태의 변화에 따라 가공영역(10)으로 이동하는데, 이때 그리퍼암(25)이 공구(26)를 가공영역(10)으로 보내는 역할을 한다. 그리퍼암(25)의 동작이 요구되는 경우, 즉 공구(26)를 바꾸는 경우에 도어(30)가 열린다. The tool 26 in the standby area 20 moves to the machining area 10 according to the change in the machining state, wherein the gripper arm 25 serves to send the tool 26 to the machining area 10. The door 30 is opened when operation of the gripper arm 25 is required, that is, when the tool 26 is changed.

도 2는 종래의 자동공구교환장치(2)의 도어개폐장치의 구성을 나타낸 것이다. 도어개폐장치는 크게 도어(30), 도어(30)에 연결된 실린더(50), 실린더(50)에 유압을 공급하는 공급관(55), 도어(30)의 이동방향을 설정하는 가이드레일(40), 유압로의 방향을 제어하는 제어밸브(60)로 구성되어 있다.Figure 2 shows the configuration of the door opening and closing device of the conventional automatic tool changer (2). The door opening and closing device includes a door 30, a cylinder 50 connected to the door 30, a supply pipe 55 for supplying hydraulic pressure to the cylinder 50, and a guide rail 40 for setting a moving direction of the door 30. And a control valve 60 for controlling the direction of the hydraulic passage.

공구의 교체가 요구되는 경우, 제어밸브(60)에서의 절환위치에 따라 압유가 실린더(50)로 공급되고 실린더(50)가 상부로 이동하게 된다. 실린더(50)와 연결되어있는 도어(30)는 실린더(50)의 이동에 의하여, 가이드레일(40)을 따라 상부로 이 동하게 되므로 열린 상태가 된다. 이때 롤러(42)는 도어의 이동을 용이하게 한다.When the tool is required to be replaced, the hydraulic oil is supplied to the cylinder 50 according to the switching position in the control valve 60 and the cylinder 50 moves upward. Door 30 is connected to the cylinder 50 is moved to the top along the guide rail 40 by the movement of the cylinder 50 is in an open state. At this time, the roller 42 facilitates the movement of the door.

도어(30)가 열리는 정도로서 도어(30)의 이동거리는, 실린더에 공급되는 유압이 도어를 최대한 열 수 있는 정도로 공급된다고 할 때 도어의 길이(Lold)만큼이 된다.As the door 30 is opened, the moving distance of the door 30 is equal to the length L old of the door when the hydraulic pressure supplied to the cylinder is supplied to the extent that the door can be opened as much as possible.

상기와 같은 종래의 도어개폐장치에서 도어의 열린정도를 크게 하려면, 도어를 여는데 많은 시간이 소요되고, 이러한 소요시간이 누적됨에 따라서 공구를 계속 바꿔주어야 하는 공작에 있어서 효율이 저하되는 문제점이 있다.In order to increase the opening degree of the door in the conventional door opening and closing device as described above, it takes a long time to open the door, there is a problem that the efficiency is reduced in the work that must continue to change the tool as the required time is accumulated .

본 발명은 상기한 종래의 문제점을 개선하기 위하여 안출된 것으로서, 본 발명의 목적은 도어의 열린 정도는 동일하게 유지하되 개폐에 소요되는 시간을 단축하는 것을 특징으로 하는 자동공구교환장치의 상하이동형 도어개폐장치를 제공하는데 있다.The present invention has been made in order to improve the above-mentioned conventional problems, the object of the present invention is to maintain the same degree of opening of the door, but to reduce the time required to open and close the shanghai-type door of the automatic tool changer To provide a switchgear.

상기의 기술적 과제를 달성하기 위하여, 본 발명은 도어를 상부 및 하부로 나누어 형성하여 도어의 개폐정도를 제어하는 도어개폐장치를 제공한다.In order to achieve the above technical problem, the present invention provides a door opening and closing device for controlling the opening and closing degree of the door by forming the door divided into upper and lower parts.

이하, 첨부된 도면을 참고하여 본 발명인 자동공구교환장치의 상하이동형 도어개폐장치에 대하여 자세히 설명하면 다음과 같다.Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the Shanghai East-type door opening and closing device of the present invention automatic tool changer.

도 3은 본 발명인 상하이동형 도어개폐장치의 구성을 나타낸 것이다. Figure 3 shows the configuration of the Shanghai East-type door opening and closing device of the present invention.

상하이동형 도어개폐장치는 상부도어(100) 및 하부도어(102), 상부도어(100) 와 하부도어(102)를 연결하여 X자로 교호 접동 동작하는 접동링크(110), 상부도어(100)와 연결된 실린더(130), 실린더(130)에 유압을 공급하는 공급관(135), 실린더(130)에 공급되는 압유의 방향을 제어하는 제어밸브(140)로 이루어져 있다.Shanghai movable door opening and closing device is connected to the upper door 100 and the lower door 102, the upper door 100 and the lower door 102 by the X-link sliding link 110, the upper door 100 It is composed of a connected cylinder 130, a supply pipe 135 for supplying hydraulic pressure to the cylinder 130, a control valve 140 for controlling the direction of the pressure oil supplied to the cylinder 130.

또한, 상부도어(100) 및 하부도어(102)가 안정적으로 상하이동할 수 있도록 가이드레일(120)이 설치됨이 바람직하다. In addition, it is preferable that the guide rail 120 is installed so that the upper door 100 and the lower door 102 can be stably moved.

도 4에서 도시된 본 발명인 상하이동형 도어개폐장치의 이동동작 후의 상태를 참고하여 바람직한 실시예로서 본 발명의 동작을 살펴보면 다음과 같다.The operation of the present invention as a preferred embodiment will be described below with reference to the state after the movement operation of the Shanghai-type door opening and closing device of the present invention shown in FIG.

공구교환신호에 의해 도어의 개폐정도가 결정되는바, 도어가 열리는 경우로서 일실시예를 살펴보면 다음과 같다.The opening and closing degree of the door is determined by the tool change signal. Looking at one embodiment as the door is opened as follows.

자동공구교환장치에서 공구의 교체를 위한 개폐신호가 발생하고, 제어밸브(140)에서는 상기 신호에 의하여 압유의 방향이 선택된다. 그 후 선택방향으로 압유가 공급관(135)을 통해 실린더(130)로 공급된다. 유압이 공급된 실린더(130)에서는 작동로드(131)가 자동공구교환장치의 상부를 향하여 이동한다.In the automatic tool changer, an open / close signal for replacing the tool is generated, and the control valve 140 selects the direction of the hydraulic oil based on the signal. Then, the hydraulic oil is supplied to the cylinder 130 through the supply pipe 135 in the selection direction. In the cylinder 130 supplied with hydraulic pressure, the operating rod 131 moves toward the upper portion of the automatic tool changer.

작동로드(131)의 상부이동으로 인하여 작동로드(131)와 연결된 상부도어(100) 또한 가이드레일(120)을 따라 상부로 이동하게 된다.Due to the upper movement of the operating rod 131, the upper door 100 connected to the operating rod 131 is also moved upward along the guide rail 120.

상부도어(100)의 이동시, 상부도어(100)에 일단이 고정연결되고 타단이 하부도어(102)에 고정연결된 접동링크(110)가 늘어나게 된다. 즉, 상부도어(100)의 이동에 의하여 접동링크(110)의 일단이 상부로 이동되어 그 결과 접동링크(110)가 늘어나고, 접동링크(110)가 늘어나면서 접동링크(110)의 타단이 연결된 하부도어(102)가 아래로 밀리게 된다. During the movement of the upper door 100, one end is fixedly connected to the upper door 100 and the other end of the sliding link 110 is fixedly connected to the lower door 102 is extended. That is, one end of the sliding link 110 is moved upward by the movement of the upper door 100, and as a result, the sliding link 110 is extended, and the other end of the sliding link 110 is connected as the sliding link 110 is extended. The lower door 102 is pushed down.

상부도어(100)의 이동으로써 하부도어(102)까지 열리게 되는 본 발명은 도 2에 도시된 바와 같이 도어를 Lold 만큼 이동하지 않고, Lold의 1/2배만큼 이동시키므로 종래의 도어 개폐시의 속도와 동일한 속도로 도어를 개폐한다면, 소요시간이 반으로 줄어드는 효과를 얻을 수 있는 것이다.The present invention, which is opened to the lower door 102 by moving the upper door 100, does not move the door by L old as shown in FIG. 2, but moves it by 1/2 times of L old . If you open and close the door at the same speed as, the time required can be reduced by half.

상기의 도어가 열리는 경우와 반대로서 도어가 닫히는 경우에는, 실린더(130)에 가해지는 유압의 방향이 바뀌므로(즉, 유압이 배출되므로) 실린더(130) 내부의 작동로드(131)가 자동공구교환장치의 하부로 이동하며, 따라서 상부도어(100), 접동링크(110) 및 하부도어(102)의 이동은 도어가 열리는 경우와 반대로 동작하게 된다.When the door is closed as opposed to the case where the door is opened, since the direction of hydraulic pressure applied to the cylinder 130 is changed (that is, the hydraulic pressure is discharged), the operating rod 131 inside the cylinder 130 is an automatic tool. It moves to the lower part of the exchange device, so that the movement of the upper door 100, the sliding link 110 and the lower door 102 is operated in the opposite way as the door is opened.

본 실시예에서는 실린더(130)의 작동로드(131)를 상부도어(100)측에 연결하였으나, 본 발명은 이와 반대로 실린더(130)의 작동로드(131)를 하부도어(102)측에 연결하여 구성할 수 있음은 물론이다.In this embodiment, the operating rod 131 of the cylinder 130 is connected to the upper door 100 side, but in the present invention, the operating rod 131 of the cylinder 130 is connected to the lower door 102 side. Of course, it can be configured.

또한, 본 발명의 일실시예로서, 자동공구교환장치의 개폐동작에 대하여 설명하였지만, 본 발명인 자동공구교환장치의 상하이동형 도어개폐장치는 상기 자동공구교환장치에의 사용으로만 국한되는 것은 아니며, 필요공간 축소 및 개폐시간의 감소가 요구되는 다른 분야의 장치의 개폐시에도 사용될 수 있음은 물론이다.In addition, as an embodiment of the present invention, the opening and closing operation of the automatic tool changer was described, but the shanghai-type door opening and closing device of the automatic tool changer of the present invention is not limited to the use of the automatic tool changer. Of course, it can also be used when opening and closing the device of other fields that require a reduction of the required space and reduction of the opening and closing time.

이상 설명한 바와 같이, 본 발명에 따르면 자동공구교환장치에 있어서 도어를 상하로 분리구성하여 개폐함으로써, 종래의 도어와 동일한 개폐정도를 유지하면 서 개폐 소요시간을 단축시키는 장점이 있다. 또한 개폐 소요시간의 단축으로 가공시 불필요한 시간을 줄일수 있으므로 생산성 향상에 기여할 수 있다. As described above, according to the present invention, by automatically opening and closing the door in the automatic tool changer up and down, there is an advantage of shortening the opening and closing time while maintaining the same opening and closing degree as the conventional door. In addition, by reducing the time required for opening and closing it can reduce the unnecessary time during processing can contribute to the improvement of productivity.

비록 본 발명이 상기에서 언급한 바람직한 실시예와 관련하여 설명되어졌지만, 본 발명의 요지와 범위로 부터 벗어남이 없이 다른 다양한 수정 및 변형이 가능한 것은 당업자라면 용이하게 인식할 수 있을 것이며, 이러한 변경 및 수정은 모두 첨부된 특허청구의 범위에 속함은 자명하다.Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be readily apparent to those skilled in the art that various other modifications and variations can be made without departing from the spirit and scope of the invention. It is obvious that all modifications fall within the scope of the appended claims.

Claims (2)

자동공구교환장치의 도어개폐장치에 있어서,In the door opening and closing device of the automatic tool changer, 서로 동일 평면상에서 분할되어 개폐 이동가능하게 설치된 한쌍의 상부도어(100) 및 하부도어(102)와;A pair of upper doors 100 and lower doors 102 which are divided on the same plane and installed to be opened and closed; X자로 접동가능하게 교호 연결되어 일단이 상기 상부도어(100)에 연결되고 타단이 상기 하부도어(102)에 연결된 접동링크(110)와;A sliding link 110 slidably connected to an X letter so that one end is connected to the upper door 100 and the other end is connected to the lower door 102; 상기 자동공구교환장치의 신호에 의하여 유로의 방향을 제어하는 제어밸브(140)와;A control valve 140 for controlling the direction of the flow path according to the signal of the automatic tool changer; 상기 제어밸브(140)의 절환위치에 따라 상기 상부도어(100)에 연결된 작동로드(131)를 진퇴 운동시키는 실린더(130);를 포함한 것을 특징으로 하는 자동공구교환장치의 상하이동형 도어개폐장치.Shanghai-type door opening and closing device of an automatic tool changer, comprising: a cylinder (130) for advancing and moving the operation rod (131) connected to the upper door (100) according to the switching position of the control valve (140). 청구항 1에 있어서,The method according to claim 1, 상기 상부도어(100) 및 하부도어(102)는 가이드레일(120)에 지지되어 슬라이드 안내받는 것을 특징으로 하는 자동공구교환장치의 상하이동형 도어개폐장치.The upper door 100 and the lower door 102 are supported on the guide rails 120 to slide guide the Shanghai East-type door opening and closing device of the automatic tool changer, characterized in that the slide guide.
KR1020060114297A 2006-11-20 2006-11-20 Shanghai East Door Opener of Automatic Tool Changer Expired - Fee Related KR100761203B1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105014475A (en) * 2015-07-24 2015-11-04 重庆卓田齿克科技有限公司 Protective door of machine tool
CN105563230A (en) * 2016-02-26 2016-05-11 常州机电职业技术学院 Automatic safety door of numerical control machine tool
CN106078344A (en) * 2016-06-30 2016-11-09 吴中区横泾博尔机械厂 The switching door of electromagnetic valve valve gap process equipment
KR102299285B1 (en) * 2020-09-04 2021-09-08 (주)씨케이에스감리단 distributing board

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Publication number Priority date Publication date Assignee Title
KR20190000980A (en) * 2017-06-26 2019-01-04 이동원 A personal Healthcare System

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KR20190000980A (en) * 2017-06-26 2019-01-04 이동원 A personal Healthcare System

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105014475A (en) * 2015-07-24 2015-11-04 重庆卓田齿克科技有限公司 Protective door of machine tool
CN105563230A (en) * 2016-02-26 2016-05-11 常州机电职业技术学院 Automatic safety door of numerical control machine tool
CN106078344A (en) * 2016-06-30 2016-11-09 吴中区横泾博尔机械厂 The switching door of electromagnetic valve valve gap process equipment
KR102299285B1 (en) * 2020-09-04 2021-09-08 (주)씨케이에스감리단 distributing board

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