CN107455301A - A kind of freshwater mussel takes pearl with opening housing apparatus - Google Patents
A kind of freshwater mussel takes pearl with opening housing apparatus Download PDFInfo
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- CN107455301A CN107455301A CN201710714855.4A CN201710714855A CN107455301A CN 107455301 A CN107455301 A CN 107455301A CN 201710714855 A CN201710714855 A CN 201710714855A CN 107455301 A CN107455301 A CN 107455301A
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- 241000237536 Mytilus edulis Species 0.000 title claims abstract description 23
- 235000020638 mussel Nutrition 0.000 title claims abstract description 23
- 239000013505 freshwater Substances 0.000 title claims 7
- 230000005540 biological transmission Effects 0.000 claims abstract description 29
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 239000000758 substrate Substances 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 210000005056 cell body Anatomy 0.000 claims 1
- 230000008450 motivation Effects 0.000 claims 1
- 238000003825 pressing Methods 0.000 abstract description 20
- 239000011049 pearl Substances 0.000 abstract description 11
- 230000006978 adaptation Effects 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 235000020639 clam Nutrition 0.000 description 14
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 241000237519 Bivalvia Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K61/00—Culture of aquatic animals
- A01K61/50—Culture of aquatic animals of shellfish
- A01K61/54—Culture of aquatic animals of shellfish of bivalves, e.g. oysters or mussels
- A01K61/56—Culture of aquatic animals of shellfish of bivalves, e.g. oysters or mussels for pearl production
- A01K61/57—Pearl seeds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
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- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Marine Sciences & Fisheries (AREA)
- Zoology (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Meat, Egg Or Seafood Products (AREA)
Abstract
一种河蚌取珠用开壳装置，属于珍珠获取设备领域。是由传送机架、前支撑架、下压电动机、上基板、传送带、传送电动机、定位盘、卡孔、传送辊、导向机架、导向体、丝杠、控制器、行程开关、下压板、导向槽、配合柱、导行机构和定位板组成的，所述传送机架上安装有传送带，所述传送带的两端配合有传送辊，传送带上设置有卡孔，所述定位盘焊接在传送机架上，所述定位盘上安装有传送电动机，该装置通过导行机构和导向槽以及传送带的配合实现了河蚌壳体的竖直状态的长期保持，配合下压板实现了对河蚌壳的有效破碎，导行机构上弹簧一和弹簧二的设置使导向架对于河蚌壳体具有一定的适应范围，同时能够保证河蚌壳体的对中性。
The utility model relates to a shell-opening device for extracting pearls from mussels, which belongs to the field of pearl acquisition equipment. It consists of a transmission frame, a front support frame, a lower pressure motor, an upper base plate, a conveyor belt, a transmission motor, a positioning plate, a card hole, a transmission roller, a guide frame, a guide body, a screw, a controller, a travel switch, a lower pressure plate, It consists of a guide groove, a matching column, a guide mechanism and a positioning plate. A conveyor belt is installed on the conveyor frame, and conveyor rollers are fitted at both ends of the conveyor belt. On the frame, a transmission motor is installed on the positioning plate. This device realizes the long-term maintenance of the vertical state of the clam shell through the cooperation of the guide mechanism, the guide groove and the conveyor belt, and realizes the clam shell with the lower pressing plate. Effective crushing, the setting of spring one and spring two on the guide mechanism makes the guide frame have a certain range of adaptation to the mussel shell, and can ensure the centering of the mussel shell at the same time.
Description
技术领域technical field
本发明涉及一种河蚌取珠用开壳装置，属于珍珠获取设备领域。The invention relates to a shell-opening device for extracting pearls from mussels, which belongs to the field of pearl acquisition equipment.
背景技术Background technique
珍珠是人们喜爱的饰品，在现实生产中，多是采用人工对河蚌开壳取珠，人工在进行开壳时，往往需要用非常锋利的薄片菜刀，将菜刀插入两片蚌壳的缝隙中，然后劈开蚌肉，由于蚌壳紧闭，且缝隙极小，工作人员很少能够一次切入，往往需要多次重复尝试，这一过程不仅工作效率低下，而且具有较大的潜在危险，为此，需要一种河蚌取珠用开壳装置来取代人工开壳这一过程。Pearls are people's favorite jewelry. In actual production, most of the mussels are manually opened to remove the pearls. When opening the shells manually, it is often necessary to use a very sharp thin slice kitchen knife to insert the kitchen knife into the gap between the two clam shells. , and then split the clam meat. Since the clam shell is tightly closed and the gap is extremely small, the staff can seldom cut in at one time, and often need to try repeatedly. This process is not only inefficient, but also has great potential danger. Therefore, need a kind of river mussel to get pearl and replace this process of artificially opening shell with shell-opening device.
发明内容Contents of the invention
针对上述的不足，本发明提供了一种河蚌取珠用开壳装置。In view of the above-mentioned deficiencies, the present invention provides a shell-opening device for clam shell extraction.
本发明是通过以下技术方案实现的：一种河蚌取珠用开壳装置，是由传送机架、前支撑架、下压电动机、上基板、传送带、传送电动机、定位盘、卡孔、传送辊、导向机架、导向体、丝杠、控制器、行程开关、下压板、导向槽、配合柱、导行机构和定位板组成的，所述传送机架上安装有传送带，所述传送带的两端配合有传送辊，传送带上设置有卡孔，所述定位盘焊接在传送机架上，所述定位盘上安装有传送电动机，所述传送电动机的输出轴和传送棍通过联轴器连接，所述传送机架的内部套有导向体，所述导向体的前端设置有前支撑架，所述导向体的后端连接有导向机架，所述导向机架的上端设置有上基板，所述上基板上固定有下压电动机，所述下压电动机有两个，所述下压电动机的下方设置通过丝杠和下压板连接，所述下压板的上方设置有配合柱，所述前支撑架的侧面设置有行程开关，所述上基板的下方设置有控制器，所述导向机架的前端设置有导行机构，所述导向机架上导向槽和定位板相间均匀分布。The present invention is achieved through the following technical proposals: a shell-opening device for clams to extract pearls, which is composed of a transmission frame, a front support frame, a pressing motor, an upper base plate, a conveyor belt, a transmission motor, a positioning plate, a clamping hole, a transmission Roller, guide frame, guide body, lead screw, controller, travel switch, lower pressure plate, guide groove, matching column, guide mechanism and positioning plate. The conveyor belt is installed on the conveyor frame. Conveyor rollers are fitted at both ends, and card holes are provided on the conveyor belt. The positioning plate is welded on the transmission frame, and a transmission motor is installed on the positioning plate. The output shaft of the transmission motor and the transmission roller are connected through a coupling. , the inside of the transmission frame is covered with a guide body, the front end of the guide body is provided with a front support frame, the rear end of the guide body is connected with a guide frame, and the upper end of the guide frame is provided with an upper base plate, A pressing motor is fixed on the upper base plate, and there are two pressing motors. The lower part of the pressing motor is connected with the lower pressing plate through a screw, and a matching column is arranged above the lower pressing plate. A travel switch is arranged on the side of the support frame, a controller is arranged under the upper base plate, a guide mechanism is arranged on the front end of the guide frame, and guide grooves and positioning plates are evenly distributed alternately on the guide frame.
更进一步地，所述导行机构是由主体、转轴一、转轴二、弹簧一、导行架、转块一、转轴三、滑柱、弹簧二、槽体和配合筒组成的，所述导行架通过转轴二和主体配合，所述导行架和转轴二之间设置有弹簧一，所述导行架的左端设置有转块一，所述转块一通过转轴三与滑柱配合，所述滑柱和配合筒配合，所述滑柱和配合筒之间设置有弹簧二，所述配合筒通过转轴一与主体配合进行转动。Furthermore, the guide mechanism is composed of the main body, the first rotating shaft, the second rotating shaft, the first spring, the guide frame, the first rotating block, the third rotating shaft, the sliding column, the second spring, the groove body and the matching cylinder. The traveling frame cooperates with the main body through the rotating shaft 2, a spring 1 is arranged between the guiding frame and the rotating shaft 2, a rotating block 1 is arranged at the left end of the guiding frame, and the rotating block 1 cooperates with the sliding column through the rotating shaft 3, The sliding column cooperates with the matching cylinder, and a spring 2 is arranged between the sliding column and the matching cylinder, and the matching cylinder rotates through the cooperation of the rotating shaft 1 with the main body.
更进一步地，所述导行架的中间位置设置有凹槽。Furthermore, a groove is provided at the middle position of the guide frame.
更进一步地，所述导向槽的截面形状为倒置的等腰梯形Furthermore, the cross-sectional shape of the guide groove is an inverted isosceles trapezoid
更进一步地，所述传动机架的下方设置有下料斗。Furthermore, a lower hopper is provided below the transmission frame.
更进一步地，所述导向机架的下方设置有底板。Furthermore, a bottom plate is provided below the guide frame.
该发明的有益之处是，该装置通过导行机构和导向槽以及传送带的配合实现了河蚌的竖直状态的长期保持，配合下压板实现了对河蚌壳的有效破碎，导行机构上弹簧一和弹簧二的设置使导向架对于河蚌壳体具有一定的适应范围，同时能够保证河蚌壳体的对中性，传送带套置在导向体的外周有力于节省空间，使该装置结构紧凑，通过下压电动机和丝杠以及下压板和行程开关的配合使传送平稳，便于控制，不会引起较大的震动，也不会对河蚌壳内的珍珠造成破坏。The advantage of this invention is that the device realizes the long-term maintenance of the vertical state of the clam through the cooperation of the guide mechanism, the guide groove and the conveyor belt, and realizes the effective crushing of the clam shell by cooperating with the lower pressing plate. The setting of spring 1 and spring 2 makes the guide frame have a certain range of adaptation to the mussel shell, and at the same time can ensure the centering of the mussel shell. Compact, the transmission is stable and easy to control through the cooperation of the pressing motor and the lead screw, the pressing plate and the travel switch, and will not cause large vibrations or damage the pearls in the mussel shells.
附图说明Description of drawings
图1为该装置的整体结构示意图；Fig. 1 is the overall structural representation of this device;
图2为导向体部分的结构示意图；Fig. 2 is the structural representation of guide part;
图3为导行机构在导向体前端固定状态的局部放大图；Fig. 3 is a partially enlarged view of the state where the guide mechanism is fixed at the front end of the guide body;
图4为一对导行机构的结构示意图；Fig. 4 is a structural schematic diagram of a pair of guiding mechanisms;
图5为单个导向架机构的结构示意图。Fig. 5 is a structural schematic diagram of a single guide frame mechanism.
图中，1、传送机架，2、前支撑架，3、下压电动机，4、上基板，5、传送带，6、传送电动机，7、定位盘，8、卡孔，9、传送辊，10、导向机架，11、导向体，12、丝杠，13、控制器，14、行程开关，15、底板，16、下料斗，17、下压板，18、导向槽，19、配合柱，20、导行机构，2001、主体，2002、转轴一，2003、转轴二，2004、弹簧一，2005、导行架，2006、转块一，2007、转轴三，2008、滑柱，2009、弹簧二，2010、槽体，2011配合筒，21、定位板。In the figure, 1. Conveyor frame, 2. Front support frame, 3. Press down motor, 4. Upper substrate, 5. Conveyor belt, 6. Conveyor motor, 7. Positioning plate, 8. Clamping hole, 9. Conveyor roller, 10. Guide frame, 11. Guide body, 12. Lead screw, 13. Controller, 14. Travel switch, 15. Base plate, 16. Lower hopper, 17. Lower pressure plate, 18. Guide groove, 19. Cooperating column, 20. Guide mechanism, 2001, main body, 2002, shaft one, 2003, shaft two, 2004, spring one, 2005, guide frame, 2006, block one, 2007, shaft three, 2008, sliding column, 2009, spring Two, 2010, tank body, 2011 matching cylinder, 21, positioning plate.
具体实施方式detailed description
一种河蚌取珠用开壳装置，是由传送机架1、前支撑架2、下压电动机3、上基板4、传送带5、传送电动机6、定位盘7、卡孔8、传送辊9、导向机架10、导向体11、丝杠12、控制器13、行程开关14、下压板17、导向槽18、配合柱19、导行机构20和定位板21组成的，所述传送机架1上安装有传送带5，所述传送带5的两端配合有传送辊8，传送带5上设置有卡孔8，所述定位盘7焊接在传送机架1上，所述定位盘7上安装有传送电动机6，所述传送电动机6的输出轴和传送辊9通过联轴器连接，所述传送机架1的内部套有导向体11，所述导向体11的前端设置有前支撑架2，所述导向体11的后端连接有导向机架10，所述导向机架10的上端设置有上基板4，所述上基板4上固定有下压电动机3，所述下压电动机3有两个，所述下压电动机3的下方设置通过丝杠12和下压板17连接，所述下压板17的上方设置有配合柱19，所述前支撑架2的侧面设置有行程开关14，所述上基板4的下方设置有控制器13，所述导向机架10的前端设置有导行机构20，所述导向机架10上导向槽18和定位板21相间均匀分布。A shell-opening device for clam shell extraction, which is composed of a transmission frame 1, a front support frame 2, a pressing motor 3, an upper base plate 4, a conveyor belt 5, a transmission motor 6, a positioning plate 7, a clamping hole 8, and a transmission roller 9 , guide frame 10, guide body 11, lead screw 12, controller 13, travel switch 14, lower pressure plate 17, guide groove 18, matching column 19, guide mechanism 20 and positioning plate 21, the transmission frame 1 is equipped with a conveyor belt 5, the two ends of the conveyor belt 5 are equipped with conveyor rollers 8, the conveyor belt 5 is provided with a clamping hole 8, the positioning plate 7 is welded on the transmission frame 1, and the positioning plate 7 is installed with The transmission motor 6, the output shaft of the transmission motor 6 and the transmission roller 9 are connected by a coupling, the inside of the transmission frame 1 is covered with a guide body 11, and the front end of the guide body 11 is provided with a front support frame 2, The rear end of the guide body 11 is connected with a guide frame 10, the upper end of the guide frame 10 is provided with an upper base plate 4, the upper base plate 4 is fixed with a pressing motor 3, and the pressing motor 3 has two One, the lower part of the pressing motor 3 is connected by a lead screw 12 and the lower pressing plate 17, a matching column 19 is arranged above the lower pressing plate 17, a travel switch 14 is arranged on the side of the front support frame 2, and the A controller 13 is arranged below the upper base plate 4 , a guide mechanism 20 is arranged at the front end of the guide frame 10 , and guide grooves 18 and positioning plates 21 are evenly distributed alternately on the guide frame 10 .
更进一步地，所述导行机构20是由主体2001、转轴一2002、转轴二2003、弹簧一2004、导行架2005、转块一2006、转轴三2007、滑柱2008、弹簧二2009、槽体2010和配合筒2011组成的，所述导行架2005通过转轴二2003和主体2001配合，所述导行架2005和转轴二2003之间设置有弹簧一2004，所述导行架2005的左端设置有转块一2006，所述转块一2006通过转轴三2007与滑柱2008配合，所述滑柱2008和配合筒2011配合，所述滑柱2008和配合筒2011之间设置有弹簧二2009，所述配合筒2011通过转轴一2002与主体2001配合进行转动，所述槽体2010设置在主体2001的右端。Further, the guide mechanism 20 is composed of the main body 2001, the first rotating shaft 2002, the second rotating shaft 2003, the first spring 2004, the guide frame 2005, the first rotating block 2006, the third rotating shaft 2007, the sliding column 2008, the second spring 2009, the slot Body 2010 and matching cylinder 2011, the guide frame 2005 cooperates with the main body 2001 through the second shaft 2003, a spring one 2004 is arranged between the guide frame 2005 and the second shaft 2003, the left end of the guide frame 2005 Turning block 1 2006 is provided, said turning block 1 2006 cooperates with sliding column 2008 through rotating shaft 3 2007, said sliding column 2008 cooperates with matching cylinder 2011, and spring 2 2009 is arranged between said sliding column 2008 and matching cylinder 2011 , the matching cylinder 2011 rotates in cooperation with the main body 2001 through the first rotating shaft 2002 , and the groove body 2010 is arranged at the right end of the main body 2001 .
更进一步地，所述导行架2005的中间位置设置有凹槽，适应河蚌壳体本身自有的弧度，便于扶正。Furthermore, the middle position of the guide frame 2005 is provided with a groove, which adapts to the radian of the clam shell itself and is convenient for straightening.
更进一步地，所述导向槽18的截面形状为倒置的等腰梯形，便于河蚌壳体滑行，同时对河蚌壳体内的珍珠进行保护。Furthermore, the cross-sectional shape of the guide groove 18 is an inverted isosceles trapezoid, which facilitates the sliding of the clam shell and protects the pearls in the clam shell.
更进一步地，所述传动机架1的下方设置有下料斗16，便于对碎壳之后的河蚌进行收集。Furthermore, a lower hopper 16 is arranged below the transmission frame 1 to facilitate the collection of mussels after shell breaking.
更进一步地，所述导向机架10的下方设置有底板15，增大受力面积，承受下压板15下压时的冲击力。Furthermore, a bottom plate 15 is provided below the guide frame 10 to increase the force bearing area and withstand the impact force when the lower pressing plate 15 is pressed down.
该装置在使用时，首先接通电源，通过控制器13开启该装置，将河蚌壳缝朝上放置在传送带5上的卡孔8中，随着传送电动机6带动传送带5转动向前运行，此时河蚌壳体的下端在导行槽18中滑行，当河蚌壳体运动到导行机构20时，首先进入导行架2005，在传送带5的带动下，河蚌壳体继续向前运动，导行架2005压缩弹簧一2004，同时弹簧二2009被压缩，此时滑柱2008和配合筒2011配合滑动，配合筒2011通过转轴一2002进行转动，此时在一对导行机构20的作用下，河蚌壳体被扶正，然后下压电动机3通过丝杠12带动下压板17下压，下压板17行至行程开关14对河蚌壳体进行下压，河蚌壳体部分被压碎，然后在传送带5的转动下带动河蚌壳体继续前进，最后落入到下料斗16中将部分碎裂的河蚌壳体进行收集，然后由人工进行珍珠的剥离工作。When the device is in use, first turn on the power, open the device through the controller 13, place the mussel shell seam upwards in the clamping hole 8 on the conveyor belt 5, and move forward as the conveyor belt 5 is driven by the conveyor motor 6 to rotate. At this time, the lower end of the clam shell slides in the guide groove 18. When the clam shell moves to the guide mechanism 20, it first enters the guide frame 2005, and driven by the conveyor belt 5, the clam shell continues to move forward. Movement, the guide frame 2005 compresses the spring one 2004, and the spring two 2009 is compressed at the same time, at this time, the sliding column 2008 and the matching cylinder 2011 cooperate to slide, and the matching cylinder 2011 rotates through the rotating shaft 1 2002. At this time, the pair of guide mechanisms 20 Under the action, the mussel shell is straightened, and then the pressing motor 3 drives the lower pressing plate 17 to press down through the lead screw 12, and the lower pressing plate 17 travels to the travel switch 14 to press down the mussel shell, and the mussel shell is partially pressed. Then, under the rotation of the conveyor belt 5, the mussel shells are driven to move on, and finally fall into the lower hopper 16 to collect the partially fragmented mussel shells, and then the pearls are peeled off manually.
对于本领域的普通技术人员而言，根据本发明的教导，在不脱离本发明的原理与精神的情况下，对实施方式所进行的改变、修改、替换和变型仍落入本发明的保护范围之内。For those of ordinary skill in the art, according to the teaching of the present invention, without departing from the principle and spirit of the present invention, the changes, modifications, replacements and modifications to the implementation still fall within the protection scope of the present invention within.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710714855.4A CN107455301B (en) | 2017-08-19 | 2017-08-19 | Shell opening device for pearl taking of freshwater mussels |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710714855.4A CN107455301B (en) | 2017-08-19 | 2017-08-19 | Shell opening device for pearl taking of freshwater mussels |
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| Publication Number | Publication Date |
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| CN107455301A true CN107455301A (en) | 2017-12-12 |
| CN107455301B CN107455301B (en) | 2020-07-03 |
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| CN201710714855.4A Active CN107455301B (en) | 2017-08-19 | 2017-08-19 | Shell opening device for pearl taking of freshwater mussels |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112931596A (en) * | 2021-01-22 | 2021-06-11 | 张加文 | Continuous freshwater mussel opening device |
| CN113575666A (en) * | 2021-08-05 | 2021-11-02 | 哈工大机器人（合肥）国际创新研究院 | Automatic oyster shell opening machine and oyster shell opening method |
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| US20160066725A1 (en) * | 2014-06-12 | 2016-03-10 | Robert Lee, Jr. | Oyster opening device |
| CN106069950A (en) * | 2016-07-15 | 2016-11-09 | 赵明岩 | Full-automatic mussel opens shell method for fetching beads |
| CN206118805U (en) * | 2016-08-29 | 2017-04-26 | 广州市祺福珍珠加工有限公司 | Automatic pearl device of getting of pearl shell |
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| US4532677A (en) * | 1967-03-31 | 1985-08-06 | Slade Gorton & Co., Inc. | Apparatus for opening and eviscerating scallops |
| US20160066725A1 (en) * | 2014-06-12 | 2016-03-10 | Robert Lee, Jr. | Oyster opening device |
| CN106069950A (en) * | 2016-07-15 | 2016-11-09 | 赵明岩 | Full-automatic mussel opens shell method for fetching beads |
| CN206118805U (en) * | 2016-08-29 | 2017-04-26 | 广州市祺福珍珠加工有限公司 | Automatic pearl device of getting of pearl shell |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112931596A (en) * | 2021-01-22 | 2021-06-11 | 张加文 | Continuous freshwater mussel opening device |
| CN113575666A (en) * | 2021-08-05 | 2021-11-02 | 哈工大机器人（合肥）国际创新研究院 | Automatic oyster shell opening machine and oyster shell opening method |
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| Publication number | Publication date |
|---|---|
| CN107455301B (en) | 2020-07-03 |
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