KR20060112399A - Device for measuring the inner diameter of a hole - Google Patents

Device for measuring the inner diameter of a hole Download PDF

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Publication number
KR20060112399A
KR20060112399A KR1020050034788A KR20050034788A KR20060112399A KR 20060112399 A KR20060112399 A KR 20060112399A KR 1020050034788 A KR1020050034788 A KR 1020050034788A KR 20050034788 A KR20050034788 A KR 20050034788A KR 20060112399 A KR20060112399 A KR 20060112399A
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South Korea
Prior art keywords
measurer
hole
inner diameter
main body
measuring
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KR1020050034788A
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Korean (ko)
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김영우
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한국항공우주산업 주식회사
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Priority to KR1020050034788A priority Critical patent/KR20060112399A/en
Publication of KR20060112399A publication Critical patent/KR20060112399A/en

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • E02D5/80—Ground anchors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/20—Securing of slopes or inclines
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/0046—Production methods using prestressing techniques
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0026—Metals
    • E02D2300/0029—Steel; Iron
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0071—Wood
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2600/00—Miscellaneous
    • E02D2600/30—Miscellaneous comprising anchoring details

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Length-Measuring Instruments Using Mechanical Means (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)

Abstract

A device for measuring an inner diameter of a hole is provided to measure the inner diameter of the hole through an indication point installed from the central part of a dial member to the outside to indicate a scale unit. In a device for measuring an inner diameter of a hole, an upper part of a body(10) is closed and a lower part thereof is opened. A cone-shaped measuring device(15) is ascended and descended through the opened lower part of the body. An ascending member(20) is extended from the central part of the measuring device to the upper part thereof, and has a rack tooth unit(21) at one side thereof. A dial member(30) is rotatably mounted at one side of upper part of the body, and has a pinion tooth unit(31) coupled with the rack tooth unit of the ascending member, a scale unit(32) at one side thereof, and an indication point(23) installed from the central part to the outside to indicate the scale unit. A mounting jaw(12) is formed inside the body, and an elastic member(25) is interposed between the upper surface of the measuring device to give the measuring device a downward deflection force.

Description

홀 내경 측정기구{Device for measuring the inner diameter of a hole}Device for measuring the inner diameter of a hole}

도 1은 본 발명의 일 실시예에 따른 홀 내경 측정기구를 도시한 단면도.1 is a cross-sectional view showing a hole inner diameter measuring mechanism according to an embodiment of the present invention.

도 2는 본 발명의 홀 내경 측정기구를 이용하여 실제 홀의 내경을 측정하는 상태를 도시한 사용상태도.Figure 2 is a use state diagram showing a state of measuring the actual diameter of the actual hole using the hole inner diameter measuring mechanism of the present invention.

도 3은 본 발명의 다른 실시예에 따른 홀 내경 측정기구에 적용되는 측정자의 다른 형태를 도시한 사시도Figure 3 is a perspective view showing another form of the measurer applied to the hole inner diameter measuring mechanism according to another embodiment of the present invention

도 4는 본 발명의 다른 실시예에 따른 홀 내경 측정기구를 이용하여 측정대상물의 타원형 홀의 장축 및 단축을 측정하는 상태를 도시한 도면이다. 4 is a view showing a state of measuring the long axis and the short axis of the elliptical hole of the measurement object using the hole inner diameter measuring mechanism according to another embodiment of the present invention.

* 도면의 주요 부분에 대한 부호의 간단한 설명 *Brief description of symbols for the main parts of the drawings

10 : 본체 15 : 측정자10: main body 15: measurer

20 : 승강부재 25 : 탄성부재20: elevating member 25: elastic member

30 : 다이얼부재30: dial member

본 발명은 각종 판재상의 기계 부품 상에 형성된 홀의 내경을 보다 정확하고 신속하게 측정할 수 있는 홀 내경측정기구에 관한 것이다. The present invention relates to a hole inner diameter measuring mechanism that can more accurately and quickly measure the inner diameter of a hole formed on a machine part on various plate materials.

일반적으로, 항공기, 자동차, 선박 등과 같은 각종 기계장치 또는 전자장치 등에는 부품과 부품 사이를 체결하기 위한 체결공 또는 기능적 작동을 구현하기 위한 각종 관통공 등이 형성되어 있으며, 이러한 체결공, 관통공 등과 같은 홀(hole)은 그 조립적 또는 기능적인 측면에서 내경의 정밀도가 매우 중요하게 요구되고 있다. In general, various mechanical devices or electronic devices such as aircraft, automobiles, ships, etc. are formed with fastening holes for fastening parts and parts, or various through holes for implementing functional operations. Holes, such as the like, the precision of the inner diameter is very important in the assembly or functional aspects.

따라서, 각종 홀의 내경을 정밀하게 측정하여야 할 필요가 있으며, 이러한 홀의 내경을 측정하는 종래의 방식은 주로 버니어 캘리퍼스 등과 같은 측정기구를 이용하여 왔다. Therefore, it is necessary to accurately measure the inner diameters of various holes, and the conventional method of measuring the inner diameters of these holes has mainly used measuring instruments such as vernier calipers.

하지만, 이와 같이 버니어 캘리퍼스를 이용하여 홀의 내경을 측정하는 방식은 그 측정의 신뢰도를 높이기 위하여 수회 반복하여 그 내경을 측정한 뒤에 그 평균치를 구하여야 하고, 또한 홀 내경에서의 위치를 여러번 변경하는 방식으로 측정함으로써, 그 측정작업이 매우 번거러울 뿐만 아니라 많은 시간이 소요되는 단점이 있었다. However, the method of measuring the inner diameter of the hole using a vernier caliper as described above is to obtain the average value after measuring the inner diameter several times in order to increase the reliability of the measurement, and also to change the position in the hole inner diameter several times. By measuring with, the measurement work was very cumbersome and had a disadvantage of taking a lot of time.

또한, 버니어 캘리퍼스를 이용할 경우에는, 홀의 축선에 대한 버니어 캘리퍼스의 직각도를 정밀하게 유지하기 곤란할 뿐만 아니라, 작업자가 버니어 캘리퍼스를 파지하는 파지력에 따라 국부적인 측정값의 오차가 발생하게 되는 단점이 있었다. In addition, in the case of using the vernier caliper, it is difficult to precisely maintain the perpendicularity of the vernier caliper with respect to the axis of the hole, and there is a disadvantage in that an error of the local measured value occurs according to the gripping force of the operator holding the vernier caliper. .

따라서, 본 발명은 상기와 같은 점을 감안하여 안출한 것으로, 홀의 내경 측정작업을 신속하게 할 수 있을 뿐만 아니라 그 홀 내경의 측정을 보다 정밀하게 할 수 있는 홀의 내경 측정기구를 제공하는 데 그 목적이 있다. Accordingly, the present invention has been made in view of the above-mentioned point, and an object of the present invention is to provide an internal diameter measuring mechanism of a hole which can not only quickly measure the inner diameter of the hole but also make the measurement of the inner diameter of the hole more accurate. There is this.

상기와 같은 목적을 달성하기 위한 본 발명의 일형태는, One embodiment of the present invention for achieving the above object,

상단부는 폐쇄되고, 하단부는 개방된 본체와;A top end of which is closed and a bottom end of which is opened;

본체의 개방된 하단부를 통해 승하강가능하게 구비되고, 원추형상으로 이루어진 측정자와;A measurer provided to be able to move up and down through an open lower end of the main body, and having a conical shape;

측정자의 중심부에서 상부로 연장되고, 일측면에 래크치형부가 형성된 승강부재와;An elevating member extending upward from a center of the measurer and having a rack tooth formed on one side thereof;

본체의 상부 일측에 회전가능하게 설치되고, 그 일부분이 외부로 노출되며, 외주면에 승강부재의 래크치형부에 치합되는 피니언치형부가 형성되고, 일측면에 눈금부가 형성되며, 중심으로부터 외측으로 지시침이 눈금부를 지시하도록 설치된 다이얼부재와;It is rotatably installed on the upper one side of the main body, a part of which is exposed to the outside, a pinion tooth portion is formed on the outer peripheral surface to be engaged with the latch tooth portion of the elevating member, a scale portion is formed on one side, the indicator needle from the center to the outside A dial member provided to indicate this scale portion;

본체 내부에 형성된 장착턱 및 측정자의 상부면 사이에 개재되어 측정자에 하방향의 편향력을 부여하는 탄성부재를 포함한다. It includes an elastic member interposed between the mounting jaw formed in the main body and the upper surface of the measuring instrument to impart a downward biasing force to the measuring instrument.

본 발명의 다른 양태는,Another aspect of the present invention,

상단부는 폐쇄되고, 하단부는 개방된 본체와;A top end of which is closed and a bottom end of which is opened;

본체의 개방된 하단부를 통해 승하강가능하게 구비되고, 오면체 형상으로 이루어진 측정자와;A measurer provided to be lowered and lowered through an open lower end of the main body, and having a pentagonal shape;

측정자의 중심부에서 상부로 연장되고, 일측면에 래크치형부가 형성된 승강 부재와;An elevating member extending upward from a center of the measurer and having a rack tooth formed on one side thereof;

본체의 상부 일측에 회전가능하게 설치되고, 그 일부분이 외부로 노출되며, 외주면에 승강부재의 래크치형부에 치합되는 피니언치형부가 형성되고, 일측면에 눈금부가 형성되며, 중심으로부터 외측으로 지시침이 눈금부를 지시하도록 설치된 다이얼부재와;It is rotatably installed on the upper one side of the main body, a part of which is exposed to the outside, a pinion tooth portion is formed on the outer peripheral surface to be engaged with the latch tooth portion of the elevating member, a scale portion is formed on one side, the indicator needle from the center to the outside A dial member provided to indicate this scale portion;

본체 내부에 형성된 장착턱 및 상기 측정자의 상부면 사이에 개재되어 측정자에 하방향의 편향력을 부여하는 탄성부재를 포함한다. And an elastic member interposed between the mounting jaw formed in the main body and the upper surface of the measurer to impart a downward biasing force to the measurer.

이하, 본 발명의 바람직한 실시예를 첨부된 도면을 참조하여 상세히 설명한다. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1 및 도 2는 본 발명의 일 실시예에 따른 홀의 내경 측정기구를 도시한 도면이다. 1 and 2 are views showing the inner diameter measuring mechanism of the hole according to an embodiment of the present invention.

도시된 바와 같이, 본 발명의 홀 내경 측정기구는 상단은 폐쇄되고 하단은 개방된 본체(10)와, 본체(10)의 개방된 하단에 구비된 측정자(15)와, 이 측정자(15)를 탄성적으로 지지하는 탄성부재(25)와, 측정자(15)의 중심부에서 상부로 연장된 승강부재(20)와, 이 승강부재(20)에 의해 회전하는 다이얼부재(30)를 포함한다. As shown, the hole inner diameter measuring apparatus of the present invention has a main body 10 closed at the top and an open bottom, a measurer 15 provided at the open bottom of the main body 10, and the measurer 15. An elastic member 25 elastically supported, a lifting member 20 extending upward from the center of the measuring member 15, and a dial member 30 rotated by the lifting member 20.

본체(10)는 그 상단부가 폐쇄되고, 그 하단부는 개방된 형태로 이루어지며, 그 일측에 개구가 형성되며, 이 개구 측에 후술하는 다이얼부재(30)가 회전가능하게 장착된다. The main body 10 has an upper end thereof closed, an lower end thereof formed in an open form, and an opening is formed at one side thereof, and a dial member 30 to be described later is rotatably mounted.

측정자(15)는 원추형상으로 이루어져, 홀(50)의 내경면에 삽입이 용이하게 구성된다. The measurer 15 has a conical shape, and is easily inserted into the inner diameter surface of the hole 50.

탄성부재(25)는 본체(10) 내부에 형성된 장착턱(12) 및 측정자(15)의 상부면 사이에 개재되어 측정자(15) 측에 하방의 편향력을 부여하도록 구성된다. The elastic member 25 is interposed between the mounting jaw 12 formed in the main body 10 and the upper surface of the measurer 15 to be configured to impart downward biasing force to the measurer 15 side.

승강부재(20)는 측정자(15)의 중심부로부터 상부로 연장되어 측정자(15)와 일체로 승하강하도록 구성되고, 그 일측면에 래크치형부(21)가 형성된다. The elevating member 20 extends upward from the center of the measurer 15 and is configured to move up and down integrally with the measurer 15, and a rack-shaped portion 21 is formed at one side thereof.

다이얼부재(30)는 원판형상으로 이루어져 본체(10)의 일측면 상에 그 축선부가 회전가능하게 설치되고, 그 일부면이 외부로 노출되며, 이 노출된 일부면에는 눈금부(32)가 형성된다. The dial member 30 is formed in a disc shape, and the axis portion is rotatably installed on one side of the main body 10, and a part of the surface is exposed to the outside, and the scale part 32 is formed on the part of the exposed part. do.

다이얼부재(30)의 외주면 상에는 승강부재(20)의 래크 치형부(21)가 치합되는 피니언 치형부(31)가 형성됨으로써, 승강부재(20)의 승하강작동에 의해 다이얼부재(30)는 회전작동하도록 구성된다.On the outer circumferential surface of the dial member 30, the pinion teeth 31 to which the rack teeth 21 of the elevating member 20 are engaged are formed, whereby the dial member 30 is moved by the elevating operation of the elevating member 20. It is configured to operate in rotation.

또한, 다이얼부재(30)의 중심부 측에서 외측방향으로 눈금부(32)를 가리키는 지시침(32)이 고정설치되고, 이 지시침(23)을 통해 홀(50)의 내경치수가 측정된다.In addition, the indicator needle 32 pointing toward the scale portion 32 in the outward direction from the center of the dial member 30 is fixedly installed, and the inner diameter of the hole 50 is measured through the indicator needle 23.

이러한 승강부재(20) 및 다이얼부재(30) 사이의 상호 치합된 구성에 의해, 승강부재(20)의 승하강 길이가 다이얼부재(30)의 눈금부(32)를 통해 표시된다. By the mutually engaged configuration between the elevating member 20 and the dial member 30, the elevating length of the elevating member 20 is displayed through the scale portion 32 of the dial member 30.

이러한 다이얼부재(30)의 눈금부(32)는 다음의 식(1)에 의해 홀(50)의 내경치수 단위가 환산되어 표시된다. The scale part 32 of this dial member 30 is displayed by converting the internal diameter dimension unit of the hole 50 by following Formula (1).

홀의 내경(d) = 2×(H-h)×tanφ.....식(1)Inner diameter of hole (d) = 2 × (H-h) × tanφ ..... Equation (1)

여기서, d는 홀의 내경이고, H는 측정자(15)의 높이이며, h는 측정자(15)의 상부면에서 이 측정자(15)가 접촉하는 측정대상물(51)의 표면까지의 길이이고, φ는 측정자(15)의 꼭지각을 절반으로 나눈 값에 해당한다. Here, d is the inner diameter of the hole, H is the height of the measuring device 15, h is the length from the upper surface of the measuring device 15 to the surface of the measuring object 51 that the measuring device 15 contacts, φ is It corresponds to a value obtained by dividing the vertex angle of the measurer 15 by half.

이상과 같이 구성된 본 발명은 도 2에 도시된 바와 같이, 본체(10)를 측정대상물(51)의 홀(50) 측에 접근시킨 후에, 측정자(15)를 홀(50) 내경면으로 삽입하게 되면, 측정자(15)는 본체(10) 내에서 상방향으로 상승하게 되고, 이에 따라 측정자(15)에 치합된 다이얼부재(30)가 회전하면 지시침(32)을 통해 홀(50)의 내경(d)을 측정할 수 있게 된다. 여기서, 홀(50)의 내경(d)은 상술한 식(1)에 따라 홀(50)의 내경(d) 치수가 도출된다. As shown in FIG. 2, the present invention configured as described above allows the main body 10 to approach the hole 50 side of the measurement object 51, and then inserts the measurer 15 into the hole 50 inner diameter surface. When the measurer 15 rises upward in the main body 10, and thus rotates the dial member 30 engaged with the measurer 15, the inner diameter of the hole 50 through the indicator needle 32. (d) can be measured. Here, the inner diameter d of the hole 50 is derived from the dimension of the inner diameter d of the hole 50 according to the above formula (1).

도 3은 본 발명의 측정자(15)를 다른 형태로 적용한 실시예로서, 본 실시예는 도 4에 도시된 바와 같이, 타원형태의 홀(70) 치수(즉, 홀(70)의 장축(L1) 및 단축(L2))를 측정하기 위한 것이다. 3 is an embodiment in which the measurer 15 of the present invention is applied in another form. As shown in FIG. 4, the present embodiment has an elliptical shape of the hole 70 (that is, the long axis L1 of the hole 70). ) And short axis L2).

도 3에 도시된 바와 같이, 본 실시예의 측정자(15)는 오면체 형상으로 이루어지고, 그 양측면(15a, 15b)이 라운딩처리된다. As shown in Fig. 3, the measurer 15 of this embodiment has a pentagonal shape, and both side surfaces 15a and 15b are rounded.

그리고, 그외의 나머지는 구성 및 작동관계는 도 1 및 도 2에 개시된 일 실시예와 동일하므로 자세한 설명은 생략한다. In addition, since the rest of the configuration and operation relationship is the same as the embodiment disclosed in Figures 1 and 2 will not be described in detail.

오면체 형상의 측정자(15)는 도 4에 도시된 바와 같이, 타원형태의 홀(70)의 장축(L1) 및 단축(L2)을 개별적으로 측정할 수 있게 된다. As shown in FIG. 4, the pentagonal shape measurer 15 can measure the major axis L1 and the minor axis L2 of the elliptical hole 70 separately.

상기와 같은 본 발명은, 홀의 내경 측정작업을 신속하게 할 수 있을 뿐만 아니라 그 홀 내경의 측정을 보다 정밀하게 할 수 있는 효과가 있다. The present invention as described above can not only quickly measure the inner diameter of the hole, but also have the effect of more precisely measuring the inner diameter of the hole.

Claims (2)

상단부는 폐쇄되고, 하단부는 개방된 본체와;A top end of which is closed and a bottom end of which is opened; 상기 본체의 개방된 하단부를 통해 승하강가능하게 구비되고, 원추형상으로 이루어진 측정자와;A measurer provided to be able to move up and down through the open lower end of the main body, and having a conical shape; 상기 측정자의 중심부에서 상부로 연장되고, 일측면에 래크치형부가 형성된 승강부재와;An elevating member extending upward from a center of the measurer and having a rack tooth formed on one side thereof; 상기 본체의 상부 일측에 회전가능하게 설치되고, 그 일부분이 외부로 노출되며, 외주면에 승강부재의 래크치형부에 치합되는 피니언치형부가 형성되고, 일측면에 눈금부가 형성되며, 중심으로부터 외측으로 지시침이 눈금부를 지시하도록 설치된 다이얼부재와;It is rotatably installed on the upper one side of the main body, a part of which is exposed to the outside, a pinion tooth portion is formed on the outer peripheral surface to be engaged with the rack tooth portion of the elevating member, a scale portion is formed on one side, directed from the center to the outside A dial member provided so that the needle points to the scale portion; 상기 본체 내부에 형성된 장착턱 및 상기 측정자의 상부면 사이에 개재되어 측정자에 하방향의 편향력을 부여하는 탄성부재를 포함하는 것을 특징으로 하는 홀 내경 측정기구. And a resilient member interposed between a mounting jaw formed in the main body and an upper surface of the measurer to impart a downward biasing force to the measurer. 상단부는 폐쇄되고, 하단부는 개방된 본체와;A top end of which is closed and a bottom end of which is opened; 상기 본체의 개방된 하단부를 통해 승하강가능하게 구비되고, 오면체 형상으로 이루어진 측정자와;A measurer provided to be movable up and down through the open lower end of the main body, the measuring member having a pentagonal shape; 상기 측정자의 중심부에서 상부로 연장되고, 일측면에 래크치형부가 형성된 승강부재와;An elevating member extending upward from a center of the measurer and having a rack tooth formed on one side thereof; 상기 본체의 상부 일측에 회전가능하게 설치되고, 그 일부분이 외부로 노출되며, 외주면에 승강부재의 래크치형부에 치합되는 피니언치형부가 형성되고, 일측면에 눈금부가 형성되며, 중심으로부터 외측으로 지시침이 눈금부를 지시하도록 설치된 다이얼부재와;It is rotatably installed on the upper one side of the main body, a part of which is exposed to the outside, a pinion tooth portion is formed on the outer peripheral surface to be engaged with the rack tooth portion of the elevating member, a scale portion is formed on one side, directed from the center to the outside A dial member provided so that the needle points to the scale portion; 상기 본체 내부에 형성된 장착턱 및 상기 측정자의 상부면 사이에 개재되어 측정자에 하방향의 편향력을 부여하는 탄성부재를 포함하는 것을 특징으로 하는 홀 내경 측정기구.And a resilient member interposed between a mounting jaw formed in the main body and an upper surface of the measurer to impart a downward biasing force to the measurer.
KR1020050034788A 2005-04-27 2005-04-27 Device for measuring the inner diameter of a hole KR20060112399A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102035593B1 (en) * 2018-07-26 2019-11-26 (주)호원 Inspection apparatus for parts
CN111912375A (en) * 2020-06-29 2020-11-10 安徽美博智能科技有限公司 Detection device for air conditioner production
KR20210073907A (en) * 2019-12-11 2021-06-21 일륭기공(주) Inside Distance Inspection Device of Joint Shaft
KR102318904B1 (en) * 2021-04-29 2021-10-28 주식회사 한국구조진단연구원 Crack depth measuring device for safety diagnosis of structures
KR20220093769A (en) * 2020-12-28 2022-07-05 주식회사 다우정밀 Apparatus for suitability test of nozzle applied to eco-friendly vehicle

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102035593B1 (en) * 2018-07-26 2019-11-26 (주)호원 Inspection apparatus for parts
KR20210073907A (en) * 2019-12-11 2021-06-21 일륭기공(주) Inside Distance Inspection Device of Joint Shaft
CN111912375A (en) * 2020-06-29 2020-11-10 安徽美博智能科技有限公司 Detection device for air conditioner production
KR20220093769A (en) * 2020-12-28 2022-07-05 주식회사 다우정밀 Apparatus for suitability test of nozzle applied to eco-friendly vehicle
KR102318904B1 (en) * 2021-04-29 2021-10-28 주식회사 한국구조진단연구원 Crack depth measuring device for safety diagnosis of structures

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