KR20200086425A - Microwave water measuring device - Google Patents

Microwave water measuring device Download PDF

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KR20200086425A
KR20200086425A KR1020190002548A KR20190002548A KR20200086425A KR 20200086425 A KR20200086425 A KR 20200086425A KR 1020190002548 A KR1020190002548 A KR 1020190002548A KR 20190002548 A KR20190002548 A KR 20190002548A KR 20200086425 A KR20200086425 A KR 20200086425A
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ceramic plate
cylindrical body
mixer
plane
flange
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KR1020190002548A
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KR102171438B1 (en
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박찬율
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박찬율
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N22/00—Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
    • G01N22/04—Investigating moisture content

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Abstract

The present invention provides a microwave water measuring device which measures a water content included in sand or gravel at a construction site. The components are as follows. A high frequency generator (3) is mounted in a cylindrical main body (2) covered with a ceramic plate (1) with excellent hardness and wear resistance. A third-degree capacitor load open loop antenna (7) with a microstrip line (5, 5′) installed from an edge of an open loop (4) to the center and a chip capacitor (6) added to the microstrip line (5′) is mounted on the front end. A supply contact point (8) is connected to a coaxial cable (9) and a short stub (10) is formed on one side. A detection diode (11) is mounted between the supply contact point (8) and the short stub (10) of the antenna (7). A single thin stranded cable is connected to an indicator (not shown). A plane (2a) is formed by longitudinally cutting the front of the cylindrical main body (2), and then a flange (b) is formed on the edge of the plane (2a). A soft material (1a) is laminated on the upper plane of the flange (b), and the ceramic plate (1) is laminated on the upper side of the soft material (1a). When aggregate falls from above to strike the ceramic plate (1), the soft member (1a) supporting the ceramic plate (1) on the back surface of the ceramic plate (1) absorbs the impact.

Description

마이크로파 수분측정장치{MICROWAVE WATER MEASURING DEVICE}Microwave moisture measurement device {MICROWAVE WATER MEASURING DEVICE}

본 발명은 건설공사장에서 모래나 자갈에 포함되어 있는 수분함유율을 측정하는 마이크로파 수분측정장치를 제공하되,The present invention provides a microwave moisture measuring device for measuring the moisture content contained in sand or gravel at the construction site,

특히, 장시간 사용에도 수분측정부의 마모(기존과 비교할 경우 수명연장에 해당)가 되지 않거나 교체가 용이한 수분측정장치에 관한 것이다.In particular, it relates to a moisture measuring device that does not wear (corresponds to an extension of life when compared to the existing) or easily replaces the moisture measuring unit even after a long use.

일반적으로 콘크리트 믹서기에 재료를 투입할 때는 시멘트와 물은 비중이 거의 일정하여 문제가 없으나 골재(모래) 만큼은 산지에서 조건, 우천 등으로 인하여 상당량의 수분을 포함하고 있고, 특히 그 수분의 함수상태가 제각기 다르므로 사전에 골재에 함유된 수분의 양을 파악(실험)하여 설계시 반영하여 공정에 대비해야 한다.In general, when the material is put into the concrete mixer, the specific gravity of cement and water is almost constant, so there is no problem, but the aggregate (sand) contains a considerable amount of moisture due to conditions, rain, etc. Since they are different, the amount of moisture in the aggregate must be grasped (experimented) and reflected in the design to prepare for the process.

그러나, 현재의 자동화 시스템에는 시간적, 공간적으로 맞지 않는 방법임과 아울러 거의 균질의 제품을 얻어낼 수 없으므로 본 발명에서는 이를 자연상태인 골재를 믹서기에 투입하여 시멘트와 혼합시킨 뒤 최종적인 물의 양을 정확히 맞추어 넣으므로써 항상 똑같은 균질의 제품을 얻고자 한 것으로써 특히 믹서기 내부에 장착된 회전대 양측 끝단에 각각 설치된 2개의 수분 감지봉(전극)을 설치하여 이 감지봉을 통하여 DC 전압을 일정하게 공급하므로써 믹서기에 투입된 현상태의 수분의 함량에 따라 전류량의 차이를 감지하여 수분의 량을 체크하고 최종 목적달성으로 각기 다른 양의 필요분의 물을 믹서 내부로 고압 밸브에 의하여 자동적으로 분사시켜 공급할 수 있도록 하여 믹서의 혼합시간 단축은 물론 획기적인 균질한 제품이 생산되도록 함에 그 목적이 있다.However, in the present automation system, it is a time- and spatial-inconsistent method, and a nearly homogeneous product cannot be obtained. Therefore, in the present invention, the natural aggregate is mixed with cement by adding it to a blender, and the final amount of water is accurately In order to obtain the same homogeneous product at all times by fitting, the mixer is provided by supplying a constant DC voltage through these sensing rods by installing two moisture sensing rods (electrodes) respectively installed at both ends of the rotating base mounted inside the mixer. It detects the difference in the amount of current according to the moisture content in the present condition, and checks the amount of moisture and achieves the final purpose by automatically dispensing and supplying the required amount of water into the mixer by the high pressure valve. The purpose is to shorten the mixing time of the product and to produce a revolutionary homogeneous product.

일반적으로 야적된 골재나 하천, 바다에서 세척된 모래에는 기본적으로 많은 양의 수분이 함유되어 있을 뿐만 아니라 비나 눈 등으로 인해 수분이 제각기 조건이 다른 양으로 함유되어 있고 그러한 골재를 믹서기에 투입할 시에는 골재(모래)의 무게를 저울로 계량하여 모래의 건조상태일 때를 기준으로 하여 그 무게 차이로 물의 공급량과 공급여부를 판단하고 또한 다량의 수분이 포함된 골재에도Generally, aggregated aggregates, rivers, and sands washed in the sea contain not only large amounts of moisture, but also different amounts of moisture due to rain or snow, and when such aggregates are added to a blender At the time, the weight of aggregate (sand) is weighed with a scale to judge the amount of water supplied and whether it is supplied based on when the sand is dry, and also aggregates containing a large amount of moisture

단순히 물을 무게만 달아서 공급을 하여 수분함량을 맞추는 방법으로 작업을 하므로서 양질의 콘크리트 제품을 얻을 수가 없었다.It was impossible to obtain a high-quality concrete product by simply supplying water by weighing it and working in a way to match the moisture content.

이를 해결할 양으로 등록번호 10-0199472호의 마이크로파 수분측정장치가 공개되어 In order to solve this, the microwave moisture measuring device of registration number 10-0199472 has been released.

있으나 세라믹판을 교체를 할 수 없어 세라믹판 때문에 그 교체를 위해 수분 감지센서 제조공장으로 보내는 실정이어서 비용과 시간이 많이 들고, 마모로 인해 세라믹 교체 시기가 짧아 비용과 시간도 많이 든다.However, since the ceramic plate cannot be replaced, the ceramic plate is sent to the moisture sensor sensor manufacturing plant for replacement, so it costs a lot of time and money.

본 발명은 건설공사장에서 모래나 자갈에 포함되어 있는 수분함유율을 측정하는 마이크로파 수분측정장치를 제공하되,The present invention provides a microwave moisture measuring device for measuring the moisture content contained in sand or gravel at the construction site,

특히 장시간 사용에도 수분측정부의 마모가 되지 않거나 교체가 용이한 수분측정장치를 제공하고자 한다.In particular, it is intended to provide a moisture measuring device that does not wear or easily replace the moisture measuring unit even after a long use.

첨부한 도면에 의해 구성을 살펴보면 다음과 같다.Looking at the configuration by the accompanying drawings are as follows.

경도성과 내마모성이 강한 세라믹판(1)이 커버된 원통형 본체(2) 내에 고주파발생기(3)를 장착하고 전단부에는 개루우프(4) 측변에서 중앙으로 마이크로 스트립설(5)(5')을 연설한 마이크로 스트립선(5')에 칩캐패시터(6)가 부가된 제3도의 캐패시터 부하 개루우프 안테날(7)을 장착하여 급접점(8)은 동축케이블(9)로 연결하고 일측면에는 단락스터브(10)를 형성하였으며 안테나(7)의 단락스터브(10)와 급접점(8) 사이에는 검파다이오드(11)를 장착하고 한가닥의 가느다란 연선을 지시기(미도시)에 연결하여서 된 것에 있어서.A high-frequency generator 3 is mounted in a cylindrical body 2 covered with a ceramic plate 1 having strong hardness and abrasion resistance, and a microstrip 5 (5') is installed at the front end from the side of the open loop (4) to the center. To the microstrip line 5', the capacitor load 6 of the third degree, to which the chip capacitor 6 is added, is mounted, so that the rapid contact point 8 is connected by a coaxial cable 9, and on one side A short-circuit stub 10 was formed, and between the short-circuit stub 10 and the sharp contact point 8 of the antenna 7, a detection diode 11 was mounted, and a thin strand of a strand was connected to an indicator (not shown). I have.

상기 원통형 본체(2) 전방을 길이방향으로 절개하여 평면(2a)을 형성한 다음The front surface of the cylindrical body 2 is cut in the longitudinal direction to form a flat surface 2a,

상기 평면(2a) 테두리에 플랜지(b)를 형성하고 플렌지(b) 상측 평면에 A flange (b) is formed at the edge of the plane (2a) and the flange (b) is located at the upper plane.

연질재질(1a)를 적층하고 상기 연질재질(1a) 상측에 세라믹판(1)을 적층하는 구성으로 하여 골재가 상측으로부터 낙하하여 상기 세라믹판(1)에 타격하면 상기 세라믹판(1) 이면에서 상기 세라믹판(1)을 떠받치고 있는 연질부재(1a)가 충격을 흡수하는 구성이다.When a soft material (1a) is stacked and a ceramic plate (1) is stacked on the upper side of the soft material (1a), the aggregate falls from the upper side and strikes the ceramic plate (1). The soft member 1a supporting the ceramic plate 1 absorbs shock.

본 발명은 수분측정장치를 제공하되, 장시간 사용에도 수분측정부의 마모가 되지 않거나 교체가 용이한 수분측정장치를 제공함으로서 보다 경제적이라 할 수 있다The present invention provides a moisture measuring device, but it can be said to be more economical by providing a moisture measuring device that is not worn or replaced easily even when used for a long time.

상기 이상의 효과는 구체적인 내용에 더 밝혀진다.The above-mentioned effects are further revealed in specific contents.

도 1은 본 발명의 마이크로파 수분측정장치의 사시도,
도 2는 본 발명의 요부 분해사시도,
도 3,4은 본 발명이 실시예를 나타낸 사시도.1 is a perspective view of a microwave moisture measuring device of the present invention,
Figure 2 is an exploded perspective view of main parts of the present invention,
3 and 4 is a perspective view showing an embodiment of the present invention.

본 발명은 모래나 자갈에 포함되어 있는 수분함수율(水分含水率)을 본체 내에 장착된 마이크로파 수분측정 안테나와 고주파 발생기로 정확한 함수계측을 하여 지시기에 입력 표출시켜 주므로써 토목, 건축공사장에서 시멘트 몰탈을 형성할 때에 시멘트와 물의 양을 증감 조절하여 가장 정확한 배합을 시켜 콘크리트 구조물의 강도가 균형을 유지하게 하여 부실 공사를 추방하고 불의의 재난물 예방할 수 있도록 한 것으로 첨부된 도면에 의해 상세히 설명하면 다음과 같다.In the present invention, the water content of water contained in sand or gravel is accurately measured by a microwave moisture measuring antenna and a high frequency generator mounted in the body, and inputted to the indicator, so that cement mortar is used in civil engineering and construction works. When forming, the amount of cement and water is adjusted to increase and decrease to make the most accurate formulation so that the strength of the concrete structure can be balanced to expel bad construction and prevent unforeseen disasters. same.

경도성과 내마모성이 강한 세라믹판(1)이 커버된 원통형 본체(2) 내에 고주파발생기(3)를 장착하고 전단부에는 개루우프(4) 측변에서 중앙으로 마이크로 스트립설(5)(5')을 연설한 마이크로 스트립선(5')에 칩캐패시터(6)가 부가된 제3도의 캐패시터 부하 개루우프 안테날(7)을 장착하여 급접점(8)은 동축케이블(9)로 연결하고 일측면에는 단락스터브(10)를 형성하였으며 안테나(7)의 단락스터브(10)와 급접점(8) 사이에는 검파다이오드(11)를 장착하고 한가닥의 가느다란 연선을 지시기(미도시)에 연결하여서 된 것에 있어서.A high-frequency generator 3 is mounted in a cylindrical body 2 covered with a ceramic plate 1 having strong hardness and abrasion resistance, and a microstrip 5 (5') is installed at the front end from the side of the open loop (4) to the center. To the microstrip line 5', the capacitor load 6 of the third degree, to which the chip capacitor 6 is added, is mounted, so that the rapid contact point 8 is connected by a coaxial cable 9, and on one side A short circuit stub 10 was formed, and between the short circuit stub 10 and the sharp contact 8 of the antenna 7, a detection diode 11 was mounted, and a thin strand of a strand was connected to an indicator (not shown). I have.

상기 원통형 본체(2) 전방을 길이방향으로 절개하여 평면(2a)을 형성한 다음The front surface of the cylindrical body 2 is cut in the longitudinal direction to form a flat surface 2a,

상기 평면(2a) 테두리에 플랜지(b)를 형성하고 플렌지(b) 상측 평면에 A flange (b) is formed at the edge of the plane (2a) and the flange (b) is located at the upper plane.

연질재질(1a)를 적층하고 상기 연질재질(1a) 상측에 세라믹판(1)을 적층하는 구성으로 하여 골재가 상측으로부터 낙하하여 상기 세라믹판(1)에 타격하면 상기 세라믹판(1) 이면에서 상기 세라믹판(1)을 떠받치고 있는 연질부재(1a)가 충격을 흡수하는 구성이다.When a soft material (1a) is stacked and a ceramic plate (1) is stacked on the upper side of the soft material (1a), the aggregate falls from the upper side and strikes the ceramic plate (1). The soft member 1a supporting the ceramic plate 1 absorbs shock.

상기 원통형 본체(2)의 전방을 수평으로 혼합기 내부에 수용하되 세라믹판(1)이 상기 원통형 본체(2) 원주연 방향으로 소정각도 기울어져 있고,The front of the cylindrical body 2 is horizontally accommodated inside the mixer, but the ceramic plate 1 is inclined at a predetermined angle in the circumferential direction of the cylindrical body 2,

상기 원통형 본체(2) 후방은 혼합기(100) 벽을 관통하여 수평으로 외부에 있도록 설치하여 혼합기(100)의 벽면으로부터 헛돌도록 한 후 탄성체(20)에 의해 지지된 상태에서,The rear of the cylindrical body 2 penetrates the wall of the mixer 100 and is installed horizontally to the outside so that it is idle from the wall surface of the mixer 100 and then supported by the elastic body 20,

혼합기(100) 내부에서 중량의 골재가 낙하하여 세라믹판(1)을 타격하면 세라믹판(1)이 상기 원통형 본체(2)의 원주방향으로 소정각도 회전 후 원위치하는 구성이다.When the aggregate of the weight falls inside the mixer 100 and strikes the ceramic plate 1, the ceramic plate 1 is rotated at a predetermined angle in the circumferential direction of the cylindrical body 2, and then is returned to its original position.

상기 세라믹판(1)이 원주방향으로 소정각도 회전하여 경사지게 위치된 상태에 있어 골재에 타격을 받으면 소정각도 더 회전하게 된다.The ceramic plate 1 is rotated at a predetermined angle in the circumferential direction and is in an inclined position, and when the aggregate is hit by the aggregate, the predetermined angle is further rotated.

그 후 탄성체(20)의 복원력에 의해 다시 원위치 된다.After that, it is returned to the original position by the restoring force of the elastic body 20.

이처럼 낙하하는 중량에 따라 회전하므로 세라믹판(1)에 타격을 덜 받게 되어 그 만큼 손상이 되지 않는다.As it rotates according to the falling weight as described above, it is less damaged by the ceramic plate 1 and thus is less damaged.

앞에서 언급한 종래는 충격을 흡수할 수 있는 구성이 없어 세라믹판이 손상되어 a/s발생 확률이 매우 높아 경제성이 떨어진다.In the above-mentioned conventional art, there is no configuration capable of absorbing the impact, and thus the ceramic plate is damaged, so the probability of a/s occurrence is very high and economic efficiency is poor.

그리고 본 발명의 원통형 본체 내부 후방에 송신장치를 설치하고 관리자측에 수신장치가 설치된 지시기를 이용하면 무선으로 감지된 수분값을 확인할 수 있다.In addition, if the transmitter is installed inside the cylindrical body of the present invention and the receiver is installed on the manager side, the moisture value detected wirelessly can be checked.

더나가 등록번호10-0199472호의 기술내용을 인용하면, Further, when citing the technical contents of registration number 10-0199472,

원통형 본체(2)의 세라믹판(1)이 빈과 직각이 되게 입구가 막히거나 골재의 흐름을 방해하지 않도록 케이트가 공간이 유지되는 위치에 설치하고 전원을 인가하면서 골재(도시하지 않았음)를 낙하시키면 고주파 발생기(3)에서 고주파 신호가 발생하고 이 발생된 고주파 신호는 동축케이블(생략)을 통해 안테나(7)의 급접점(8)에 급전된다. 급전신호는 안테나(7)의 개루우프(4)의 일측(a)으로부터 급접점(8) 방향으로 통해서 안테나(7)의 상면의 세라믹판(1)을 통해 전파에너지를 발생하게 되고 방사된 전파에너지는 골재에 포함되어 있는 수분에 의해 일부는 흡수되어 감소되고 이때에 감소된 전압의 크기를 안테나(7)의 단락스터브(10)와 급접점(8) 사이에 장착된 검파다이오드(11)를 통해 검출된 전압은 지시기(12)로 입력되어 수분량(%)으로 환산되어 표시되는 것이다.As the ceramic plate 1 of the cylindrical body 2 is at a right angle to the bin, the gate is installed in a position where the space is maintained so that the entrance is not blocked or the flow of aggregate is maintained, and the aggregate (not shown) is applied while power is applied. When dropped, a high-frequency signal is generated from the high-frequency generator 3, and the generated high-frequency signal is fed to a rapid contact point 8 of the antenna 7 through a coaxial cable (not shown). The feed signal generates radio energy through the ceramic plate 1 on the upper surface of the antenna 7 from one side (a) of the open loop 4 of the antenna 7 in the direction of the rapid contact point 8 and radiated radio waves The energy is partially absorbed and reduced by the moisture contained in the aggregate, and at this time, the magnitude of the reduced voltage is detected by the detection diode 11 mounted between the short-circuit stub 10 and the rapid contact point 8 of the antenna 7. The voltage detected through is input to the indicator 12 and converted into a water content (%) and displayed.

1 : 세라믹판 2 : 원통형 본체
3 : 고주파발생기 4 : 개루우프
5,5' : 마이크로스트립선 6 : 칩캐패시터
7 : 안테나 8 : 급접점(고주파 신호인가점)
9 : 동축케이블 10 : 단락스터브
11 : 검파다이오드 1: Ceramic plate 2: Cylindrical body
3: High frequency generator 4: Open loop
5,5': Microstrip wire 6: Chip capacitor
7: Antenna 8: Sudden contact (high frequency signal application point)
9: Coaxial cable 10: Short circuit stub
11: detection diode

Claims (2)

경도성과 내마모성이 강한 세라믹판(1)이 커버된 원통형 본체(2) 내에 고주파발생기(3)를 장착하고 전단부에는 개루우프(4) 측변에서 중앙으로 마이크로 스트립설(5)(5')을 연설한 마이크로 스트립선(5')에 칩캐패시터(6)가 부가된 제3도의 캐패시터 부하 개루우프 안테날(7)을 장착하여 급접점(8)은 동축케이블(9)로 연결하고 일측면에는 단락스터브(10)를 형성하였으며 안테나(7)의 단락스터브(10)와 급접점(8) 사이에는 검파다이오드(11)를 장착하고 한가닥의 가느다란 연선을 지시기(미도시)에 연결하여서 된 것에 있어서.

상기 원통형 본체(2) 전방을 길이방향으로 절개하여 평면(2a)을 형성한 다음
상기 평면(2a) 테두리에 플랜지(b)를 형성하고 플렌지(b) 상측 평면에
연질재질(1a)를 적층하고 상기 연질재질(1a) 상측에 세라믹판(1)을 적층하는 구성으로 하여 골재가 상측으로부터 낙하하여 상기 세라믹판(1)에 타격하면 상기 세라믹판(1) 이면에서 상기 세라믹판(1)을 떠받치고 있는 연질부재(1a)가 충격을 흡수하는 구성을 포함한 것을 특징으로 하는 마이크로파 수분측정장치.
A high-frequency generator 3 is mounted in a cylindrical body 2 covered with a ceramic plate 1 having strong hardness and abrasion resistance, and a microstrip 5 (5') is installed at the front end from the side of the open loop (4) to the center. To the microstrip wire 5', the capacitor load 6 of the third degree to which the chip capacitor 6 is added is mounted, so that the rapid contact point 8 is connected by a coaxial cable 9, and on one side A short circuit stub 10 was formed, and between the short circuit stub 10 and the sharp contact 8 of the antenna 7, a detection diode 11 was mounted, and a thin strand of a strand was connected to an indicator (not shown). I have.

The front surface of the cylindrical body 2 is cut in the longitudinal direction to form a flat surface 2a,
A flange (b) is formed at the edge of the plane (2a), and the flange (b) is located at the upper plane.
When a soft material (1a) is stacked and a ceramic plate (1) is stacked on the upper side of the soft material (1a), the aggregate falls from the upper side and strikes the ceramic plate (1). Microwave moisture measuring device, characterized in that it comprises a structure for absorbing the impact of the soft member (1a) supporting the ceramic plate (1).
제 1항에 있어서
상기 원통형 본체(2)의 전방을 수평으로 혼합기 내부에 수용하되 세라믹판(1)이 상기 원통형 본체(2) 원주연 방향으로 소정각도 기울어져 있고,
상기 원통형 본체(2) 후방은 혼합기(100) 벽을 관통하여 수평으로 외부에 있도록 설치하여 혼합기(100)의 벽면으로부터 헛돌도록 한 후 탄성체(20)에 의해 지지된 상태에서,
혼합기(100) 내부에서 중량의 골재가 낙하하여 세라믹판(1)을 타격하면 세라믹판(1)이 상기 원통형 본체(2)의 원주방향으로 소정각도 회전 후 원위치하는 구성을 포함한 것을 특징으로 하는 마이크로파 수분측정장치.

The method of claim 1
The front of the cylindrical body 2 is horizontally accommodated inside the mixer, but the ceramic plate 1 is inclined at a predetermined angle in the circumferential direction of the cylindrical body 2,
The rear of the cylindrical body 2 penetrates the wall of the mixer 100 and is installed horizontally to the outside so that it is idle from the wall surface of the mixer 100 and then supported by the elastic body 20,
When the aggregate of the weight falls inside the mixer 100 and strikes the ceramic plate 1, the microwave is characterized in that the ceramic plate 1 includes a configuration that rotates a predetermined angle in the circumferential direction of the cylindrical body 2 and then returns to its original position. Moisture measurement device.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112748130A (en) * 2020-12-23 2021-05-04 中山艾尚智同信息科技有限公司 Main structure of aggregate moisture content rapid determination sensor based on microwave method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0557658U (en) * 1992-01-08 1993-07-30 株式会社守谷商会 Microwave moisture analyzer
KR100199472B1 (en) * 1996-05-23 1999-06-15 조광석 Microwave water measuring device
JP2002160214A (en) * 2000-11-24 2002-06-04 Kitagawa Iron Works Co Ltd Method and apparatus for measuring water content of aggregate in ready-mixed concrete plant
KR20180049650A (en) * 2016-11-03 2018-05-11 주식회사 포스코 Charging apparatus for raw material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0557658U (en) * 1992-01-08 1993-07-30 株式会社守谷商会 Microwave moisture analyzer
KR100199472B1 (en) * 1996-05-23 1999-06-15 조광석 Microwave water measuring device
JP2002160214A (en) * 2000-11-24 2002-06-04 Kitagawa Iron Works Co Ltd Method and apparatus for measuring water content of aggregate in ready-mixed concrete plant
KR20180049650A (en) * 2016-11-03 2018-05-11 주식회사 포스코 Charging apparatus for raw material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112748130A (en) * 2020-12-23 2021-05-04 中山艾尚智同信息科技有限公司 Main structure of aggregate moisture content rapid determination sensor based on microwave method

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