KR20030037073A - method for recovery of waste molding sand & apparatus therefor - Google Patents
method for recovery of waste molding sand & apparatus therefor Download PDFInfo
- Publication number
- KR20030037073A KR20030037073A KR1020010068172A KR20010068172A KR20030037073A KR 20030037073 A KR20030037073 A KR 20030037073A KR 1020010068172 A KR1020010068172 A KR 1020010068172A KR 20010068172 A KR20010068172 A KR 20010068172A KR 20030037073 A KR20030037073 A KR 20030037073A
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- KR
- South Korea
- Prior art keywords
- sand
- waste
- foundry sand
- crusher
- molding sand
- Prior art date
- Legal status (The legal status 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 status listed.)
- Ceased
Links
- 239000002699 waste material Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000003110 molding sand Substances 0.000 title claims abstract description 15
- 238000011084 recovery Methods 0.000 title 1
- 239000004576 sand Substances 0.000 claims abstract description 48
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 238000004898 kneading Methods 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 239000011230 binding agent Substances 0.000 claims abstract description 8
- 238000005507 spraying Methods 0.000 claims abstract description 8
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000011069 regeneration method Methods 0.000 claims abstract description 5
- 230000008929 regeneration Effects 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 3
- 238000005266 casting Methods 0.000 claims description 14
- 238000004064 recycling Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims 2
- 238000007664 blowing Methods 0.000 claims 1
- 238000003795 desorption Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000007921 spray Substances 0.000 description 7
- 238000007873 sieving Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000001172 regenerating effect Effects 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 210000003746 feather Anatomy 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011033 desalting Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000010112 shell-mould casting Methods 0.000 description 1
- 208000013623 stereotypic movement disease Diseases 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/18—Plants for preparing mould materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/04—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by grinding, blending, mixing, kneading, or stirring
- B22C5/0409—Blending, mixing, kneading or stirring; Methods therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/06—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sieving or magnetic separating
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
본 발명은 좁은 공간에서도 생사로 이용하는 주물사의 재생처리가 가능하도록 공정설비의 축소 및 소형화 설비로 일련의 연속적인 작업수단에 따라 기존방식의 대량 주물사 소요를 소량의 주물사 생산으로도 반복 재생산으로 대량 생산이 가능토록하는 등 저렴한 생산원가의 폐주물사 재생방법 및 그 장치에 관한 것이다.The present invention is a reduction and miniaturization of process equipment to enable the regeneration treatment of foundry sand used for live sand even in a narrow space, and according to a series of continuous working means, the mass production sand required by the existing method is repeatedly produced even with the production of a small amount of foundry sand. The present invention relates to a method for recovering waste foundry sand with low production cost and a device thereof.
이에 따른 구성은 주형틀의 제품으로부터 폐주물사를 탈사하여 분리하고, 상기 탈사된 폐주물사를 파쇄기에 운송하여 파쇄하고, 파쇄된 폐주물사를 체로 거르고, 체를 통과한 폐주물사에 점결제를 투하하고, 상기 혼합물에 물을 스프레이하여 습도를 조절하고, 상기 수단을 거쳐 이송되는 주물사 혼합물을 혼련 체질 및 냉각하여 저장하는 폐주물사의 재생방법이다.The constitution according to the present invention is to remove and separate the waste molding sand from the product of the mold, transfer the crushed waste molding sand to a crusher, crush the crushed waste molding sand, sift the pulverized waste molding sand passed through the sieve, and add a binder to the mixture. It is a regeneration method of waste foundry sand by spraying water to control humidity, and kneading, cooling and storing the foundry sand mixture conveyed through the above means.
그리고 상기 처리하는 장치로서는 진동 탈사기(15), 폐주물사 이송장치(16), 파쇄기(17), 진동체(screen)(18), 점결제 등을 담는 호퍼(19), 물 스프레이장치 (20), 회전 혼련체(21), 받침대(22), 냉각장치(23), 호퍼(24) 및 저장조(25)를 이루는 장치로 구성된다.In addition, as the apparatus for processing, the hopper 19 containing the vibrating decanter 15, the waste foundry sand feeder 16, the crusher 17, the vibrating body 18, the caking agent, and the water spraying device 20. And a rotating kneading body 21, a pedestal 22, a cooling device 23, a hopper 24 and a reservoir 25.
Description
본 발명은 폐주물사의 재활용에 관한 것으로, 보다 상세하게는 폐주물사를 이송, 분쇄, 점결제 투여, 습도조절, 냉각, 체질, 저장하는 등의 일련의 공정을 연속적으로 처리함과 함께 상기 처리 공정에 이용되는 장치를 좁은 공간을 이용하여 설치함으로써, 공정 설비의 축소 및 소형화로 기존 방식의 대량 주물사 소요를 소량의 주물사로도 반복 재생하여 대량 샹산이 가능한 폐주물사의 재생방법 및 그 장치에 관한 것이다.The present invention relates to the recycling of waste foundry sand, and more particularly, to continuously process a series of processes such as transporting, pulverizing, administering a binder, controlling humidity, cooling, sieving, and storing waste foundry sand, and using it in the treatment process. The present invention relates to a method for regenerating waste foundry sand in which a large amount of sulfuric acid is produced by repeatedly regenerating a large amount of foundry sand as a small amount of foundry sand by reducing and minimizing a process facility by installing a small space.
일반적으로 주물사는 주조용 모래에 각종의 화합물로 된 점결제를 함유시켜, 주조할 제품의 형상에 부합하는 형틀을 만들어, 이에 주조하고 주조된 제품에서 분리하여 얻어진 폐주물사를 폐기 처분함에 따라 막대한 경제적인 손실 및 환경 오염의 원인이 되어 왔으나, 이를 재활용하기 위한 방법이 제안되어 오고 있다.In general, foundry sand contains various compound binders in the casting sand to make a mold conforming to the shape of the product to be cast, and then discards the waste foundry sand obtained by casting and separating from the molded product. Although it has been a cause of loss and environmental pollution, a method for recycling it has been proposed.
종래의 예를 들면, 국내 공개특허공보 1998-035741호를 나타낸 도 1에서는 주형작업이 끝난 주형틀로부터 얻어진 폐주물사를 호퍼(1) 및 벨트 콘베이어(2)를 통하여 수세통(3)에 넣고 물과 함께 교반하여 주물사에 묻어있는 수용성 접착제를 제거하고, 상기 세척된 주물사를 이송 스크류(10)가 구비돤 이송장치(9)를 통하여 건조부(12)에 이송하여 건조시켜 재활용하고 있으나, 상기 수단에서는 세척 및 건조시키는 단속적인 공정만으로 구성되어 있기 때문에 균일한 입도를 갖는 폐주물사를 얻을 수 없으며, 새로운 점결재 등의 원료 혼입수단이 나타나 있지 않다. 따라서 그와 같은 일련의 연속적인 수단 및 장치가 별도로 필요하게 된다.In the prior art, for example, in Korean Patent Laid-Open Publication No. 1998-035741, in Fig. 1, the waste casting sand obtained from the mold for which the mold work is completed is placed in the water container 3 through the hopper 1 and the belt conveyor 2, Stir together to remove the water-soluble adhesive on the molding sand, and transfer the washed casting sand to the drying unit 12 through a transfer device (9) equipped with a transfer screw 10 to dry and recycle, but in the means Since it consists only of an intermittent process of washing and drying, waste casting sand having a uniform particle size cannot be obtained, and raw material mixing means such as new caking additives are not shown. Thus, such a series of continuous means and apparatus are separately required.
한편, 국내 공개실용신안공보 2000-0000024에서는, 주조공장의 쉘 주형 사 (shell molding sand)를 재활용하기 위한 것으로, 4단계로 분리할 수 있는 진동체 요동장치(2)에 마련된 진동체(1)를 이용하여 재활용할 수 있는 폐주물사만을 통과시킨다. 그리고 몸체(5)내에 복수개의 주물사 파쇄 깃(6-1 부터 6-8)이 구비되고, 그 하부에 체(8) 및 토출박스(7)를 구비하여서된 설비로 이루어진 투입구(4)에 상기 진동체(1)를 통과한 폐주물사를 투입되고, 투입된 폐주물사는 몸체내에 있는 파쇄 깃(6-1 내지 6-8)에 부딧치면서 파쇄되고, 파쇄된 폐주물사는 60매쉬 체(8)를 통과하여 토출박스(7)에 담겨진다.On the other hand, in the Korean Utility Model Publication No. 2000-0000024, a vibrating body (1) provided in a vibrating body rocking device (2) which can be separated in four stages for recycling shell molding sand of a casting factory. Pass only the waste foundry sand that can be recycled using. A plurality of foundry sand crushing feathers 6-1 to 6-8 are provided in the body 5, and are provided in the inlet 4 made of a facility having a sieve 8 and a discharge box 7 at the bottom thereof. The waste foundry sand passed through the vibrating body 1 is inputted, and the injected waste foundry sand is crushed while adhering to the shredding feathers 6-1 to 6-8 in the body, and the crushed waste foundry sand is discharged through the 60 mesh sieve 8 It is contained in the box (7).
그러나 상기와 같은 장치는 폐주물사에 새로운 점결재의 혼입수단이 없으며, 습도조절 수단과 혼련 수단 등이 전혀 나타나 있지 않다. 따라서 그와 같은 일련의 연속적인 수단 및 장치가 별도로 필요하게 된다.However, such a device has no means for mixing new caking additives in the waste casting sand, and no humidity control means and no kneading means appear. Thus, such a series of continuous means and apparatus are separately required.
상기와 같이 종래의 장치들은 폐주물사에 새로운 점결재의 혼입수단이 없으며, 습도조절 수단과 혼련 수단 등이 전혀 나타나 있지 않는 등 일련의 장치가 단속적으로 되어 있다. 따라서 그와 같은 수단을 위하여는 별도로 넓은 작업공간의 확보 및 설비투자가 필요하는 등의 문제점이 있다.As described above, the conventional apparatuses have no intervening means for incorporating new caking additives into the waste casting sand, and a series of apparatuses such as no humidity control means and no kneading means appear at all. Therefore, for such means, there are problems such as securing a large working space and facility investment separately.
본 발명은 상기한 종래의 문제점을 개선하기 위해 안출한 것으로, 좁은 공간에서도 주물사의 재생처리가 가능하도록 공정설비의 축소 및 소형화 설비로 일련의 연속적인 작업수단에 따라 기존방식의 대량 주물사 소요를 소량의 주물사 생산으로도 반복 재생산으로 대량 생산이 가능토록하는 등 저렴한 생산원가의 폐주물사를 얻는데 그 목적이 있다.The present invention has been made in order to improve the above-mentioned conventional problems, a small amount of the conventional molding sand required according to a series of continuous working means to reduce and downsize the process equipment to enable the regeneration treatment of foundry sand even in a narrow space Its purpose is to obtain waste foundry sand with cheap production cost, such that it is possible to mass-produce by repeated reproduction even through the production of foundry sand.
도 1은 종래의 폐주물사의 재생장치를 나타낸 평면도1 is a plan view showing a conventional recycling apparatus for waste casting sand
도 2는 본 발명에 따른 폐주물사의 재생장치도2 is a regeneration device of the waste casting sand according to the present invention
도면의 주요부분에 대한 부호의 설명Explanation of symbols for main parts of the drawings
15 : 진동 탈사기 16 : 이송장치15: vibratory trimmer 16: transfer device
17 : 파쇄기 18 : 진동체17: shredder 18: vibrating body
19 : 호퍼 20 : 물 스프레이19: Hopper 20: water spray
21 : 회전 혼련체 22 : 받침대21: rotating kneading body 22: pedestal
23 : 냉각장치23: cooling device
상기한 목적을 달성하기 위한 본 발명은 주형틀의 제품으로부터 폐주물사를 탈사하여 분리하는 제 1단계, 상기 탈사된 폐주물사를 파쇄기에 운송하여 파쇄시키는 제 2단계, 파쇄된 폐주물사를 체로 거르는 제 3단계, 체를 통과한 폐주물사에 점결제를 투하하는 제 4단계, 상기 혼합물에 물을 스프레이하여 습도를 조절하는제 5단계, 상기 수단을 거쳐 이송되는 주물사 혼합물을 혼련하는 제 6단계, 상기 단계에 이어 냉각하여 저장하는 단계로 이루어진다.The present invention for achieving the above object is a first step of removing and separating the waste molding sand from the product of the mold, the second step of transporting and crushing the debrised waste molding sand to a crusher, the third step of sieving the crushed waste molding sand, A fourth step of dropping a binder into the waste foundry sand that has passed through a sieve, a fifth step of controlling humidity by spraying water on the mixture, a sixth step of kneading the foundry sand mixture conveyed through the means, followed by cooling It consists of a step of storing.
상기 제 2단계에서 폐주물사를 파쇄기에 이동시키는 운송수단에 있어서는 원통체 내에 구비한 스크류에 의한 이동, 벨트 콘베이어에 의한 이동 등 여타 운송수단이 모두 적용 가능하다.In the transportation means for moving the waste casting sand to the crusher in the second step, all other transportation means, such as movement by a screw provided in the cylindrical body, movement by a belt conveyor, are applicable.
또한 상기한 단계의 공정을 위한 본 발명의 장치로서는 실시예를 나타낸 도 2와 같이, 진동 탈사기(15)측면에 위치한 벨트 콘베이어와 같은 이송장치(16), 이송장치(16) 측면에 설치된 파쇄기(17), 파쇄기(17)하부에 위치한 진동체 (screen) (18), 상기 진동체(18)의 후단에 위치한 점결제 등을 담는 호퍼(19), 호퍼(19)의 후단에 위치하여 설치된 물 스프레이장치(20), 스프레이장치(20)와 연결되어 형성되는 회전 혼련체(21), 혼련물을 하부로 내려가게 하는 받침대(22), 상기 혼련물을 냉각시키는 냉각장치(23), 호퍼(24) 및 저장조(25)를 이루는 장치로 구성된다.In addition, as the apparatus of the present invention for the process of the above step, as shown in Fig. 2 showing an embodiment, a conveying device 16, such as a belt conveyor located on the side of the vibrating decanter 15, a crusher provided on the side of the conveying device 16 (17), a hopper (19) that is located on the bottom of the crusher (17), a hopper (19) containing a binder and the like located in the rear end of the vibrator (18), located in the rear end of the hopper 19 Water spraying device 20, rotary kneading body 21 is formed in connection with the spraying device 20, pedestal 22 to lower the kneaded material, cooling device 23 for cooling the kneaded material, hopper And a device constituting the 24 and the reservoir 25.
상기 장치에 따른 작동을 설명하면, 주형작업이 끝난 주형틀을 진동 탈사기(15)에 넣고 진동 탈사하여서된 폐주물사를 벨트 콘베이어(16)로 이송하여 파쇄기(17)에 넣고 파쇄한다. 상기 파쇄된 폐주물사는 일정 매쉬(mesh)를 갖는 진동체(18)를 통과시켜 받침대(22)에 흐르게 하면서 그 후단에 위치한 호퍼(19)로부터 점결제(벤토나이트 등) 등을 투하하여 혼합하고, 상기 혼합물에 물 스프레이 (20)로부터 물을 뿌려 습도를 조절하면서 스프레이(20)하부에 설치된 일정한 매쉬 (mesh)를 갖는 회전 혼련체(21)로 혼련 체질하면서 하부로 내려가게 하는 동안에 공기 등의 냉각장치(23)로 냉각시키면서 호퍼(24)를 통해 저장조(25)에 저장시킨다.Referring to the operation according to the above device, the mold casting is completed, the mold caster is put into the vibratory spinneret 15, and the vibratory spinneret is transferred to the belt conveyor 16 to be put into the shredder 17 and crushed. The crushed waste foundry sand is passed through a vibrating body 18 having a predetermined mesh (mesh) to flow to the pedestal 22, while dropping and mixing a binder (bentonite, etc.) and the like from the hopper 19 located at the rear end thereof, Cooling device such as air while spraying water from the water spray 20 to the lower part while kneading the rotary kneading body 21 having a constant mesh installed under the spray 20 while controlling humidity. It is stored in the reservoir 25 through the hopper 24 while cooling by 23.
상기 장치 구조 중 진동탈사기(15)에서 나온 폐주물사를 이송시키는 이송수단으로서는 상기한 벨트 콘베이어와 같은 구조가 아닌 기존과 같은 원통체 내에 스크류를 구비한 이송수단 등 여타 이송수단 등을 통하여도 가능하므로 상기 콘베이어(16)에 한정하지 않는다.The conveying means for conveying the waste foundry sand from the vibratory decanter 15 of the device structure is possible through other conveying means such as a conveying means having a screw in the same cylindrical body as that of the existing structure, not the belt conveyor. It is not limited to the conveyor 16.
또한 상기 파쇄기(17)는 양쪽 스크류에 각각 톱니부를 갖는 구조로 되어 있으나, 기존의 여타 파쇄 수단을 갖는 구조로서도 가능하므로 그에 한정하지 않는다.In addition, the shredder 17 is a structure having a toothed portion in each screw, but is not limited thereto because it is also possible to have a structure having other conventional shredding means.
상기 냉각장치(23)는 호퍼(24)후면에 위치한 것으로 도시되었으나, 그에 한정하지 않고, 물 스프레이(20)후면과 호퍼(24)사이의 어느 위치에 설치하여도 무방하다.The cooling device 23 is illustrated as being located on the rear surface of the hopper 24, but is not limited thereto, and may be installed at any position between the rear surface of the water spray 20 and the hopper 24.
그리고, 폐주물사에 점결제가 혼합된 혼합물을 혼련 체질하는 회전 혼련체(21)는 물 스프레이(20)와 일체로 구성한 것 만을 도시하였으나, 물 스프레이(20)와 별도로 떨어져 설치하여도 무방하므로 물 스프레이와 일체로 구성한 것에 한정하지 않는다.In addition, the rotary kneader 21 for kneading the mixture of the caking agent mixed with the waste foundry sand is shown as being integrally formed with the water spray 20, but may be installed separately from the water spray 20, so that the water spray It is not limited to what was comprised integrally with.
상기와 같이 구성된 장치를 이용하여 폐주물사를 재생하는 본 발명은 진동 탈사수단 →이송수단 →파쇄수단 →스크린수단(체) →점결제 투여수단 →습도조절수단 →혼련 체질수단 → 냉각수단 등의 일련의 연속되는 공정을 하나의 장치로 연속하여 제조하므로서, 공정설비의 축소 및 소형화로 설비 비용의 절감 및 연속적인 제조로 저렴한 제조 단가를 갖는 폐주물사를 재생할 수 있다.The present invention for regenerating waste molding sand using the device configured as described above is a series of vibration desalting means → conveying means → crushing means → screen means (sieve) → binder dispensing means → humidity control means → kneading sieving means → cooling means By continuously manufacturing a continuous process in one device, it is possible to reclaim waste casting sand having a low manufacturing cost by reducing the cost of equipment and continuous manufacturing by reducing and minimizing the process equipment.
이상에서와 같이 본 발명은 기존의 단속적인 공정 및 장치에 따른 문제점을 개선하기 위해, 파쇄와 스크린, 새로운 원료의 첨가, 습도조절, 혼련 체질, 냉각 등의 일련의 수단을 연속적인 장치를 통하여 실시함과 함께 공정설비의 축소 및 소형화 내지는 연속된 공정으로서 저렴한 제조원가를 갖는 폐주물사를 얻을 수 있다.As described above, the present invention implements a series of means such as crushing and screening, addition of new raw materials, humidity control, kneading sieving, cooling, etc. in order to improve the problems caused by existing intermittent processes and devices. In addition, it is possible to obtain waste foundry sand having inexpensive manufacturing cost as a process of miniaturization and miniaturization or continuous process.
Claims (4)
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| KR1020010068172A KR20030037073A (en) | 2001-11-02 | 2001-11-02 | method for recovery of waste molding sand & apparatus therefor |
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| KR1020010068172A KR20030037073A (en) | 2001-11-02 | 2001-11-02 | method for recovery of waste molding sand & apparatus therefor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102407282A (en) * | 2011-11-24 | 2012-04-11 | 通辽市大林型砂有限公司 | Molding sand cleaner |
| CN102641988A (en) * | 2011-03-22 | 2012-08-22 | 如皋市大生线路器材有限公司 | Investment cast shell crushing, grading and screening system |
| KR101222741B1 (en) * | 2011-06-13 | 2013-01-15 | 송정호 | Low dusty Drum type Rainfall Sander |
| CN103394638A (en) * | 2013-08-20 | 2013-11-20 | 武汉纺织大学 | Method and apparatus for backwashing and regenerating casting used sand |
| KR20190137312A (en) * | 2018-06-01 | 2019-12-11 | 원광밸브주식회사 | System of casting process for reducing casting defect |
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| JPH10202360A (en) * | 1997-01-17 | 1998-08-04 | Watabe Seikosho:Kk | Method for recovering molding sand and apparatus therefor |
| JPH10249482A (en) * | 1997-03-10 | 1998-09-22 | Mazda Motor Corp | Method for regenerating molding sand |
| KR19980063075A (en) * | 1996-12-31 | 1998-10-07 | 이재천 | Recycling method of waste foundry sand |
| KR19980068759A (en) * | 1997-02-20 | 1998-10-26 | 이재천 | Recycling method of waste foundry sand |
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| KR19980063075A (en) * | 1996-12-31 | 1998-10-07 | 이재천 | Recycling method of waste foundry sand |
| JPH10202360A (en) * | 1997-01-17 | 1998-08-04 | Watabe Seikosho:Kk | Method for recovering molding sand and apparatus therefor |
| KR19980068759A (en) * | 1997-02-20 | 1998-10-26 | 이재천 | Recycling method of waste foundry sand |
| JPH10249482A (en) * | 1997-03-10 | 1998-09-22 | Mazda Motor Corp | Method for regenerating molding sand |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102641988A (en) * | 2011-03-22 | 2012-08-22 | 如皋市大生线路器材有限公司 | Investment cast shell crushing, grading and screening system |
| KR101222741B1 (en) * | 2011-06-13 | 2013-01-15 | 송정호 | Low dusty Drum type Rainfall Sander |
| CN102407282A (en) * | 2011-11-24 | 2012-04-11 | 通辽市大林型砂有限公司 | Molding sand cleaner |
| CN103394638A (en) * | 2013-08-20 | 2013-11-20 | 武汉纺织大学 | Method and apparatus for backwashing and regenerating casting used sand |
| KR20190137312A (en) * | 2018-06-01 | 2019-12-11 | 원광밸브주식회사 | System of casting process for reducing casting defect |
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