KR102482230B1 - Operating device for steel tundish splash cover - Google Patents
Operating device for steel tundish splash cover Download PDFInfo
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- KR102482230B1 KR102482230B1 KR1020220099579A KR20220099579A KR102482230B1 KR 102482230 B1 KR102482230 B1 KR 102482230B1 KR 1020220099579 A KR1020220099579 A KR 1020220099579A KR 20220099579 A KR20220099579 A KR 20220099579A KR 102482230 B1 KR102482230 B1 KR 102482230B1
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- South Korea
- Prior art keywords
- splash
- cover
- tundish
- covers
- splash cover
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- 229910000831 Steel Inorganic materials 0.000 title description 4
- 239000010959 steel Substances 0.000 title description 4
- 239000007921 spray Substances 0.000 claims abstract description 12
- 238000009628 steelmaking Methods 0.000 claims abstract description 7
- 238000003860 storage Methods 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 claims description 2
- 239000004576 sand Substances 0.000 description 21
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/502—Connection arrangements; Sealing means therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/56—Means for supporting, manipulating or changing a pouring-nozzle
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4653—Tapholes; Opening or plugging thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Continuous Casting (AREA)
Abstract
Description
본발명은 제강용 턴디쉬 스프레시 커버 작동장치에 관한 것으로, 보다 상세하게는 턴디쉬 스프래시 커버를 다수개로 구성하고, 실린더와 조작레버에 의해 각각 움직임으로써, 스프래시 커버움직임을 정확하고 용이하게 조절하는 제강용 턴디쉬 스프레시 커버 작동장치에 관한 것이다.The present invention relates to an apparatus for operating a tundish spray cover for steelmaking, and more particularly, by configuring a plurality of tundish splash covers and moving them respectively by a cylinder and a control lever, the splash cover can be moved accurately and easily. It relates to an operating device for controlling a tundish spray cover for steelmaking.
일반적으로 용강을 담아 안정화후 주형으로 내보내는 턴디쉬에는 커버가 설치되며 상기 커버구조에 대해 종래특허기술의 일례로서 공개특허공보 공개번호 10-2002-0052731호에는 아르곤 박스형 턴디쉬 카바의 하부에 부착된 지금을 카바로부터 분리하기 위한 장치에 있어서, 상기 카바의 상부에 분리가능하게 장착되고 중간연결부재에 의해 서로 연결되어 있고 상기 중간연결부재의 중앙부위에는 소정 크기의 관통구가 형성되어 있는 한 쌍의 지지대와, 상기 지지대의 중간연결부재 상에 분리가능하게 장착되는 지렛대봉과, 상기 지렛대봉이 상기 관통구를 관통할 수 있도록 상기 지렛대봉을 구동시키는 구동수단으로 이루어진 것을 특징으로 하는 턴디쉬 카바용 지금분리장치가 공개되어 있다. 또한, 공고번호 20-1996-0001356호에는 연속주조용 턴디쉬의 필터(Filter)형 덮개연와가 공개되어 있고, 등록번호 10-0137396턴디쉬의 슬래그유입 방지구 제조방법이 공개되어 있다.In general, a cover is installed on a tundish containing molten steel and exported to a mold after stabilization. In the device for separating the metal from the cover, a pair of supports detachably mounted on the top of the cover and connected to each other by an intermediate connection member and having a through hole of a predetermined size formed in the center of the intermediate connection member And, a lever rod detachably mounted on the intermediate connecting member of the support, and a driving means for driving the lever rod so that the lever rod can pass through the through hole. is disclosed. In addition, Publication No. 20-1996-0001356 discloses a filter-type cover of a tundish for continuous casting, and registration No. 10-0137396 discloses a method for manufacturing a tundish slag inflow prevention device.
그러나 종래의 Splash Cover는 함석판을 인력으로 설치하는 방식이었다. However, the conventional Splash Cover was a method of installing tin plates by manpower.
그리고 스프레시 커버는 하나로 만들어져 정밀조절이 어려우며 고장이 잦은 단점이 있었다.In addition, the spray cover was made of one piece, so it was difficult to precisely adjust and had frequent breakdowns.
따라서 본발명은 상기와 같은 문제점을 해결하고자 안출된 것으로, 턴디쉬 스프래시 커버를 다수개로 구성하고, 실린더와 조작레버에 의해 각각 움직임으로써, 스프래시 커버움직임을 정확하고 용이하게 조절하는 제강용 턴디쉬 스프레시 커버 구동장치를 제공하고자 하는 것이다.Therefore, the present invention has been made to solve the above problems, and consists of a plurality of tundish splash covers, each of which is moved by a cylinder and a control lever, thereby accurately and easily adjusting the movement of the splash cover. It is intended to provide a dish spray cover driving device.
본발명은 제강용 턴디쉬 스프레시 커버 구동장치에 관한 것으로, 조작레버(10)로 작동되는 실린더(20)를 턴디쉬 스프래시 커버(30)에 부착하여, 조작레버(10)를 작동하여, 스프래시 커버를 움직이는 것을 특징으로 한다.The present invention relates to a tundish spray cover driving device for steelmaking, by attaching a cylinder (20) operated by a control lever (10) to a tundish splash cover (30) and operating the control lever (10), It is characterized by moving the splash cover.
또한, 상기 스프래시 커버는 다수개인 것을 특징으로 한다.In addition, the splash cover is characterized in that a plurality.
따라서 본발명은 턴디쉬 스프래시 커버를 다수개로 구성하고, 실린더와 조작레버에 의해 각각 움직임으로써, 스프래시 커버움직임을 정확하고 용이하게 조절하는 현저한 효과가 있다.Therefore, the present invention has a remarkable effect of accurately and easily controlling the movement of the tundish splash cover by configuring a plurality of tundish splash covers and moving them respectively by the cylinder and the control lever.
도 1은 본발명의 턴디쉬 스프레시 커버 에어실린더 조작레버가 오른쪽으로 회전된 상태사진
도 2는 본발명의 턴디쉬 스프레시 커버 에어실린더 조작레버가 왼쪽으로 회전된 상태사진
도 3은 본발명의 턴디쉬 스프래시 커버 사진
도 4는 본발명의 래들모래투입장치 사진
도 5는 본발명의 래들모래투입장치 상세사진
도 6은 본발명의 래들모래투입장치 제어반 사진1 is a photograph of a state in which the tundish spray cover air cylinder control lever of the present invention is rotated to the right
2 is a photograph of a state in which the tundish spray cover air cylinder control lever of the present invention is rotated to the left
3 is a photograph of the tundish splash cover of the present invention
4 is a photograph of the ladle sand input device of the present invention
5 is a detailed photograph of the ladle sand input device of the present invention
6 is a photograph of the ladle sand input device control panel of the present invention
본발명은 제강용 턴디쉬 스프레시 커버 구동장치에 관한 것으로, 조작레버(100)로 작동되는 실린더(20)를 턴디쉬 스프래시 커버(30)에 부착하여, 조작레버(100)를 작동하여, 스프래시 커버를 움직이는 것을 특징으로 한다.The present invention relates to a tundish spray cover driving device for steelmaking, by attaching a cylinder (20) operated by a control lever (100) to a tundish splash cover (30) and operating the control lever (100), It is characterized by moving the splash cover.
또한, 상기 스프래시 커버는 다수개인 것을 특징으로 한다.In addition, the splash cover is characterized in that a plurality.
또한,상기 스프래시 커버는 다수개이며, 각각의 스프래시 커버에 실린더와 조작레버가 각각 설치되어 스프래시 커버를 각각 움직이는 것을 특징으로 한다.In addition, the splash cover is plural, and a cylinder and a control lever are respectively installed on each splash cover to move the splash cover, respectively.
또한,실린더는 에어실린더인 것을 특징으로 한다. In addition, the cylinder is characterized in that the air cylinder.
본발명을 첨부도면에 의해 상세히 설명하면 다음과 같다.도 1은 본발명의 턴디쉬 스프레시 커버 에어실린더 조작레버가 오른쪽으로 회전된 상태사진,The present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a photograph of a state in which the tundish spray cover air cylinder operating lever of the present invention is rotated to the right;
도 2는 본발명의 턴디쉬 스프레시 커버 에어실린더 조작레버가 왼쪽으로 회전된 상태사진,도 3은 본발명의 턴디쉬 스프래시 커버 사진이다.2 is a picture of a state in which the air cylinder control lever of the tundish spray cover of the present invention is rotated to the left, and FIG. 3 is a picture of the tundish splash cover of the present invention.
본발명의 Air 실린더 전,후진 동작 시점에 대해 설명하면, 본발명은 Air 실린더를 장착하여 4개의 조작레버를 각각 작동시킴으로써 각각의 Splash Cover가 동작하도록 되어 있어, Tundish 안착 후 전진시키고, 작업 종료 후 후진시킨 다음 Tundish를 교체하는 구성이다.Describing the timing of the forward and reverse operation of the air cylinder of the present invention, the present invention operates each of the splash covers by operating the four control levers by installing the air cylinder, so that the tundish is seated and moved forward, and after the work is completed It is a composition to replace the Tundish after moving backwards.
Splash Cover는 연주 Tundish 교체 시 작업 전에 작동시켜 위치시킨 후 사용함으로써 조업 중에는 작동시키지 않으며, Tundish 교체 작업 중 작동여부를 확인하여 고장이 발생되면, 고장 조치 완료 후 Splash Cover가 정상 작동되면 조업 실시하게 한다. The Splash Cover is used after being operated and positioned before work when replacing the playing Tundish so that it is not operated during operation. If a malfunction occurs during the replacement of the Tundish by checking whether it is working, the operation is performed when the Splash Cover is normally operated after the completion of the fault action. .
제어기는 에어실린더를 구동하는 구동부, 터치스크린, 패드 등의 입출력부, 데이터를 저장하는 저장부, 제어부로 구성된다.The controller is composed of a driving unit for driving an air cylinder, an input/output unit such as a touch screen and a pad, a storage unit for storing data, and a control unit.
본발명은 상황에 따라 실린더로부터 돌출되는 로드의 각각 길이를 조절하여 턴디쉬 스프래시 커버를 전체적으로 일정방향으로 기울어지게 하여 래들이나 턴디쉬의 경사각, 곧 기울어진 정도에 맞추게 할 수 있다. 상기 기울기가 설정치를 초과하면 제어기의 제어부는 위험한 것으로 판단하여 경보수단인 스피커를 통해 경보음을 발생시킨다. According to the present invention, the length of each rod protruding from the cylinder is adjusted according to circumstances so that the tundish splash cover is tilted in a certain direction as a whole to match the angle of inclination of the ladle or tundish, that is, the degree of inclination. If the slope exceeds the set value, the control unit of the controller determines that it is dangerous and generates an alarm sound through a speaker as an alarm means.
각 턴디쉬 스프래시 커버들에는 압력센서들이 각각 설치되어 각 스프래시 커버의 압력들을 센서에서 측정하여 제어기의 제어부로 전송하고 제어부는 각 스프래시 커버의 측정값이 설정치보다 크게 차이가 나는 경우 스프래시 커버들 사이에 틈이 발생하거나, 스프래시 커버 하나가 손상된 것으로 판단하여 경보수단인 스피커를 통해 경보음을 발생시킨다. 상기 제어기는 터치패드, 터치스크린 등의 입출력부, 송수신부, 데이터를 저장하는 저장부, 제어부를 포함하여 구성된다. 또한 이산화탄소 등 유해가스 탐지센서가 턴디쉬 스프래시 커버 외부표면에 설치되어 스프래시 커버를 닫은 상태에서도 계속 유해가스가 측정되면, 제어부는 마찬가지로 스프래시 커버들 사이에 틈이 발생하거나, 스프래시 커버 하나가 손상된 것으로 판단하여 경보수단인 스피커를 통해 경보음을 발생시킨다.Pressure sensors are installed on each tundish splash cover, and the pressure of each splash cover is measured by the sensor and transmitted to the control unit of the controller. It is determined that a gap is generated between the covers or that one of the splash covers is damaged, and an alarm sound is generated through a speaker as an alarm unit. The controller includes an input/output unit such as a touch pad and a touch screen, a transmission/reception unit, a storage unit for storing data, and a control unit. In addition, if a harmful gas detection sensor such as carbon dioxide is installed on the outer surface of the splash cover of the tundish and continues to measure harmful gas even when the splash cover is closed, the control unit similarly creates a gap between the splash covers or removes one of the splash covers. It is determined that is damaged and an alarm sound is generated through a speaker as an alarm means.
그리고 본발명은 래들모래투입장치에 관한 것으로, 본발명은 무게측정용 Load Cell이 탱크 하부에 설치된다. 그러므로 센서에 의해 현재 Tank 내부 잔량 확인이 가능하다. 그리고 투입량 조절이 제어부에 의해 가능한 것으로, 자동밸브제어에 의해 래들에의 투입량 가감 조정이 가능하다.And the present invention relates to a ladle sand input device, and in the present invention, a load cell for measuring weight is installed in the lower part of the tank. Therefore, it is possible to check the current remaining amount inside the tank by the sensor. In addition, the input amount can be adjusted by the control unit, and the amount added to the ladle can be adjusted by automatic valve control.
제어부는 탱크 로드셀로부터 전송된 신호를 판단하여 현재 모래량을 디스플레이에 표시하며, 설정치 이하이면 모래공급장치의 모터를 구동하게 하여, 모래를 모래공급탱크로 공급받는다. 그리고 설정치를 초과하면, 모래공급탱크로부터의 모래공급을 중지시킨다. 제어부는 현재 모래량에 기초하여 래들에는 모래공급을 자동밸브에 의해 제어하는 것으로, 통상 35kg를 래들에 한 번에 투입한다. The control unit judges the signal transmitted from the tank load cell and displays the current amount of sand on the display, and if it is less than the set value, drives the motor of the sand supply device to receive sand into the sand supply tank. When the set value is exceeded, the supply of sand from the sand supply tank is stopped. The control unit controls the supply of sand to the ladle by an automatic valve based on the current amount of sand, and usually puts 35 kg into the ladle at once.
송수신부는 제어기에 별도의 통신모듈이 설치되어 서버 내지 작업자 스마트폰과 통신될 수 있다. 입출력부는 디스플레이, 터치스크린, 터치패널을 겸용으로 사용할 수 있다. 저장부는 설정치 등 데이터가 저장되어 있고 또 측정데이타를 저장한다.A separate communication module is installed in the transceiver unit to communicate with the server or worker's smart phone. The input/output unit can be used as a display, touch screen, or touch panel. The storage unit stores data such as set values and also stores measurement data.
본발명은 Pipe Chute 막힘이 없는 것으로, 모래종류에 따라 가중치를 곱하여 생산지, 메쉬 등을 데이터화하여 저장부에 저장하고 모래종류에 따라 상중하로 구분하고 각각 모래에 해당되는 가중치를 곱한다. 그러므로 필요한 모래량을 조절할 수 있다.The present invention has no pipe chute clogging, multiplies weights according to the type of sand, converts the production area, mesh, etc. into data and stores it in the storage unit, classifies it into high, middle and low according to the type of sand, and multiplies the weight corresponding to each sand. Therefore, the required amount of sand can be adjusted.
그리고 작업조건이 비가 오거나 습도가 높을 경우에도 가중치를 곱하여 모래를 더 많이 넣게 한다.And even if the working conditions are rainy or high humidity, add more sand by multiplying the weight.
도 3을 보면, 센서가 읽은 탱크내 모래 잔여량 값이 923 kg임을 알 수 있다. 그리고 하부에 자동개폐밸브가 설치되어, 제어부의 지시에 의해 개폐되며 통상 한번에 35kg를 래들에 투입한다. 래들 하부에는 구멍이 형성되어 있어서 녹은 쇳물인 용강이 빠져나오나, 상기 모래에 의해 막은 상태에서 쇳물을 넣으면 모래에 의해 하부로 빠지지 않고, 이를 턴디쉬에 용강을 공급할시는 하부의 Slide Gate를 열어 막힌 모래가 빠지며 용강이 턴디쉬에 주입된다. Referring to FIG. 3, it can be seen that the value of the residual amount of sand in the tank read by the sensor is 923 kg. And an automatic opening and closing valve is installed at the bottom, and it is opened and closed by the instructions of the control unit, and usually 35kg is put into the ladle at a time. A hole is formed at the bottom of the ladle, so molten steel, which is molten metal, escapes. The sand is removed and the molten steel is injected into the tundish.
제어기는 본발명의 턴디쉬 스프래시 커버 제어기와 래들모래투입장치 제어기를 각각의 제어기로 제어할 수 있으나, 하나의 제어기로 구성하여 통합제어 할 수 있다.The controller may control the tundish splash cover controller and the ladle sand injection device controller of the present invention as separate controllers, but may be configured as one controller for integrated control.
따라서 본발명은 턴디쉬 스프래시 커버를 실린더와 조작레버에 의해 각각 움직임으로써, 스프래시 커버움직임을 정확하고 용이하게 조절하는 현저한 효과가 있다.Therefore, the present invention has a remarkable effect of accurately and easily controlling the movement of the splash cover by moving the tundish splash cover by the cylinder and the control lever, respectively.
100 : 조작레버
20 : 실린더
30 : 턴디쉬 스프래시 커버
40 : 방열커버
50 : 래들
10 : 탱크
1 : 센서가 읽은 탱크내 모래 잔여량 값(923 kg)100: control lever
20: cylinder
30 : Tundish Splash Cover
40: heat dissipation cover
50 : ladle
10 : tank
1: The residual amount of sand in the tank read by the sensor (923 kg)
Claims (3)
상기 제어기는 실린더(20)로부터 돌출되는 로드의 각각 길이를 조절하여 턴디쉬 스프래시 커버(30)를 전체적으로 일정방향으로 기울어지게 하여 래들이나 턴디쉬의 기울어진 경사각에 맞추게 할 수 있고, 상기 기울기가 설정치를 초과하면 제어기는 위험한 것으로 판단하여 경보수단인 스피커를 통해 경보음을 발생시키는 것이며,
각 스프래시 커버(30)들에는 압력센서들이 각각 설치되어 각 스프래시 커버(30)의 압력들을 센서에서 측정하여 제어기의 제어부로 전송하고 제어부는 각 스프래시 커버(30)의 측정값이 설정치보다 크게 차이가 나는 경우 스프래시 커버(30)들 사이에 틈이 발생하거나, 스프래시 커버(30) 하나가 손상된 것으로 판단하여 경보수단인 스피커를 통해 경보음을 발생시키며, 상기 제어기는 입출력부, 송수신부, 데이터를 저장하는 저장부, 제어부를 포함하여 구성되며, 또한 유해가스 탐지센서가 스프래시 커버(30) 외부표면에 설치되어 스프래시 커버를 닫은 상태에서도 계속 유해가스가 측정되면, 제어부는 마찬가지로 스프래시 커버(30)들 사이에 틈이 발생하거나, 스프래시 커버(30)중 하나가 손상된 것으로 판단하여 경보수단인 스피커를 통해 경보음을 발생시키는 것을 특징으로 하는 제강용 턴디쉬 스프레시 커버 구동장치By attaching the cylinder 20 operated by the control lever 100 to the splash cover 30 of the tundish 60 and operating the control lever 10 to move the splash cover, the splash cover ( 30) is plural, and the cylinder 20 and the control lever 100 are installed on the plurality of splash covers 30, respectively, and the splash covers are respectively moved under the control of the controller. Tundish splash cover for steelmaking. In the driving device,
The controller adjusts the length of each rod protruding from the cylinder 20 to incline the tundish splash cover 30 in a certain direction as a whole to match the inclination angle of the ladle or tundish, and the inclination is If the set value is exceeded, the controller determines that it is dangerous and generates an alarm sound through a speaker, which is an alarm means.
Pressure sensors are installed in each of the splash covers 30, and the pressures of each splash cover 30 are measured by the sensor and transmitted to the control unit of the controller, and the control unit determines that the measured value of each splash cover 30 is higher than the set value. If there is a large difference, it is determined that a gap is generated between the splash covers 30 or one of the splash covers 30 is damaged, and an alarm sound is generated through a speaker as an alarm means, and the controller is an input/output unit, a transmission and reception unit. It is composed of a storage unit for storing data and a control unit, and if the harmful gas detection sensor is installed on the outer surface of the splash cover 30 and continues to measure harmful gas even when the splash cover is closed, the control unit is similarly Driving a tundish spray cover for steelmaking, characterized in that a gap occurs between the splash covers 30 or one of the splash covers 30 is damaged and an alarm sound is generated through a speaker as an alarm means Device
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| KR1020220099579A KR102482230B1 (en) | 2022-08-09 | 2022-08-09 | Operating device for steel tundish splash cover |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0629749U (en) * | 1992-09-16 | 1994-04-19 | 住友重機械工業株式会社 | Tundish movable cover opening / closing device for continuous casting equipment |
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- 2022-08-09 KR KR1020220099579A patent/KR102482230B1/en active IP Right Grant
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0629749U (en) * | 1992-09-16 | 1994-04-19 | 住友重機械工業株式会社 | Tundish movable cover opening / closing device for continuous casting equipment |
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