CN114558790B - Silk cocoon climbing sorting method - Google Patents
Silk cocoon climbing sorting method Download PDFInfo
- Publication number
- CN114558790B CN114558790B CN202210186668.4A CN202210186668A CN114558790B CN 114558790 B CN114558790 B CN 114558790B CN 202210186668 A CN202210186668 A CN 202210186668A CN 114558790 B CN114558790 B CN 114558790B
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- cocoons
- rolling rods
- conveying belt
- rolling
- cocoon
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- 230000009194 climbing Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005096 rolling process Methods 0.000 claims abstract description 87
- 238000000926 separation method Methods 0.000 description 4
- 241000255789 Bombyx mori Species 0.000 description 3
- 230000031700 light absorption Effects 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/02—Measures preceding sorting, e.g. arranging articles in a stream orientating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/34—Sorting according to other particular properties
- B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
- B07C5/3422—Sorting according to other particular properties according to optical properties, e.g. colour using video scanning devices, e.g. TV-cameras
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
- B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
- B07C5/36—Sorting apparatus characterised by the means used for distribution
- B07C5/361—Processing or control devices therefor, e.g. escort memory
- B07C5/362—Separating or distributor mechanisms
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Combined Means For Separation Of Solids (AREA)
- Sorting Of Articles (AREA)
Abstract
The invention discloses a method for sorting cocoons by climbing a slope, which comprises the steps of using a wave rolling rod climbing cocoon sorting machine to sort cocoons, and comprises the following steps: the rolling rods move obliquely upwards, cocoons slide into the interval between the two rolling rods from the front end of the conveying belt, the supporting plates below the rolling rods support cocoons, the stripping wheels pull cocoons piled up higher than the rolling rods, only cocoons in the interval between the rolling rods are allowed to pass through, meanwhile, the rolling rods push cocoons on the supporting plates to rotate at a uniform speed in the opposite direction to the rolling rods and roll upwards, the image collector above the cocoons photographs the rolled cocoons for multiple times, images of the cocoons rotating for a whole circle are collected, the image processing controller analyzes and identifies the characteristics of the cocoons and judges the quality of the cocoons, and the unqualified cocoons and qualified cocoons are conveyed and collected in different channels. The invention can solve the problems that the existing cocoon sorting machine can not thoroughly separate cocoons and can not slowly rotate at uniform speed for one circle one by one, and the information collection and sorting quality of cocoons are affected.
Description
Technical Field
The invention relates to the technical field of silk reeling industry, in particular to a method for sorting cocoons.
Background
The cocoons are easy to bond with each other and not easy to separate, so the complete separation of the cocoons is a precondition for realizing the sequential separation of cocoons. The conventional mechanical cocoon sorting equipment generally comprises a rotary stripping wheel with blades on the front end of a horizontal conveying belt, conveying channels for conveying cocoons after detection and judgment are arranged below the tail end of the horizontal conveying belt, a plurality of groups of pushing devices for pushing cocoons are arranged near the tail end of the horizontal conveying belt, a batch of cocoons move at uniform speed on the horizontal conveying belt and can be divided into a plurality of smaller cocoons and a plurality of cocoons one by one under the action of the conveying belt and the stripping wheel, cocoon surface information acquisition is carried out on the cocoons and cocoons through a cocoon image collector above the conveying belt, then analysis and comparison are carried out to determine whether the cocoons are qualified or not, and qualified cocoons and single cocoons fall onto qualified product conveying channels through the tail end of the horizontal conveying belt through corresponding pushing devices, and otherwise fall onto unqualified product conveying channels. The cocoons are not thoroughly separated and cannot be completely decomposed into single cocoons, and each cocoon can not be guaranteed to slowly rotate at a uniform speed for one circle for an image collector to collect image information of the cocoons for a complete circle, so that the quality of the cocoons is inaccurate, the sorting roughness is poor, and the resource waste is large.
Disclosure of Invention
The invention aims to solve the problem of the conventional cocoon sorting machine that the cocoons cannot be thoroughly separated and slowly and uniformly rotated for one circle one by one, and the information acquisition and sorting quality of cocoons are affected.
In order to solve the problems, the technical scheme of the invention is as follows: the method comprises the steps of sorting cocoons by using a wave rolling rod climbing cocoon sorting machine, wherein the wave rolling rod climbing cocoon sorting machine comprises a rotary stripping wheel with blades on the front section of a conveying belt, an image collector is arranged above the conveying belt vertically, a defective product conveying channel and a qualified product conveying channel are arranged on the conveying belt, the conveying belt is obliquely arranged and comprises a plurality of rolling rods which are obliquely and upwardly used for conveying cocoons and reversely spin, ribs with rounded bottoms are distributed on the length of each cocoon on the rolling rods at intervals of radial circumference to form a plurality of circular arc cocoon grooves, a supporting plate is respectively arranged below each cocoon groove of the rolling rod at the bottom of the conveying belt, and a gap is reserved below each supporting plate; the rotation direction of the stripping wheel is opposite to the conveying direction of the conveying belt;
the qualified product conveying channel is positioned at the tail end of the conveying belt, and the unqualified product conveying channel is arranged below the rear section of the conveying belt;
the sorting method comprises the following steps: the rolling rods move obliquely upwards, cocoons slide into the interval between the two rolling rods from the front end of the conveying belt, the supporting plate below the rolling rods supports cocoons, the stripping wheel rotates in the opposite direction to the conveying direction of the conveying belt, cocoons piled up higher than the rolling rods are pulled out and only allow cocoons in the interval of the rolling rods to pass through, meanwhile, the rolling rods rotating reversely push cocoons on the supporting plate at uniform speed in the opposite direction of the rolling rods and roll upwards, the image collector above the rolling rods photographs the rolled cocoons for a plurality of times, images of the whole circle of rotations of the cocoons are collected, the image processing controller analyzes and identifies the characteristics of the cocoons and judges the quality of the cocoons, the unqualified cocoons fall into a unqualified product channel, and the qualified cocoons fall into the qualified product conveying channel after moving to the tail end of the conveying belt along with the rolling rods.
Among the above technical schemes, more specific schemes may be: the conveying belt comprises hollow chains at two sides driven by a motor, friction wheels are fixed at two ends of the rolling rod, the axle center of each friction wheel is connected with a long pin shaft through a bearing, and the long pin shafts are connected with the hollow chains; and friction plates which are used for friction with the friction wheels when the rolling rods run obliquely upwards are respectively arranged on the tops of the friction wheels on two sides of the conveying belt.
Further: the top of the unqualified product conveying channel is hinged with a hinge baffle at the position of each supporting plate of the conveying belt, and the hinge baffle drives the hinge baffle to open and close through a micro cylinder below the hinge baffle.
Further: the unqualified product conveying channels are at least two, and are sequentially arranged at the rear section of the conveying belt.
Further: the hollow chain is arranged on a triangle frame, and the hollow chain below the tail end of the conveying belt is inclined downwards into the frame.
Further: and the surfaces of the rolling rod, the ribs on the rolling rod and the supporting plate are black and light-absorbing.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:
according to the cocoon climbing sorting method, ribs are arranged on the rolling rods at the length distance of each cocoon to form a cocoon groove, the friction wheel and the friction plate of the rolling rods act on the rolling rods to rotate anticlockwise by combining the lower supporting plate and the upper stripping wheel which rotates in the opposite direction to the conveying direction of the conveying belt, so that smaller cocoons which are not thoroughly separated by the stripping wheels on the conveying belt are in the grooves of the rolling rods, and more than one cocoon contacted with the rolling rods can be turned down to the interval of the rear rolling rods due to the fact that the rolling rods move obliquely upwards and spin reversely, and only one cocoon is finally left, so that the complete separation of the cocoons is realized; through the inclined arrangement of the conveying belt, the dead weight of the cocoons is combined with the anticlockwise rotation of the rolling rod and the inclination upward uniform motion, the cocoons can slowly rotate at uniform speed for one circle in the cocoon grooves of the rolling rod, and the image collector can collect complete image information of the cocoons for the complete circle so as to accurately judge the quality of the cocoons; at least two unqualified product conveying channels are connected with a micro cylinder for driving the hinge baffle to open and close through the hinged hinge baffle, the hinge baffle is opened when the unqualified cocoon road is judged to fall into the unqualified product channel, qualified products are released to the qualified product channel at the tail end of the conveying belt, and the unqualified products can fall out in different unqualified product conveying channels according to different flaws, so that grading sorting is realized.
Drawings
FIG. 1 is a front view of an embodiment of the present invention;
FIG. 2 is an isometric view of an embodiment of the invention;
fig. 3 is an enlarged front view of the reject conveyance path according to the embodiment of the present invention;
FIG. 4 is an isometric view of a roller lever according to an embodiment of the present invention;
fig. 5 is a top view of a conveyor belt according to an embodiment of the invention.
Detailed Description
Embodiments of the invention are described in further detail below with reference to the attached drawing figures:
the cocoon climbing sorting method comprises the step of sorting cocoons by using a wave rolling rod climbing cocoon sorting machine. The wave rolling rod climbing cocoon sorting machine shown in the figures 1 to 5 comprises a conveying belt which is obliquely arranged, wherein a blanking plate 3 is arranged at the front end of the conveying belt, a plurality of rotary stripping wheels 4 with blades are arranged on the front section of the conveying belt, the blades are all rubber sheets in a tangential direction so as to avoid damaging cocoons, the rotary direction of the stripping wheels 5 is opposite to the conveying direction of the conveying belt, an image collector 6 is arranged vertically above the conveying belt, the conveying belt comprises a plurality of rolling rods 5 which convey cocoons obliquely upwards and spin reversely (anticlockwise in the view direction), ribs 5-1 with rounded bottoms are radially distributed on the length distance of each cocoon the rolling rod 5 to form a plurality of circular arc cocoons grooves, the cocoons of different varieties are smooth and have little difference according to the length of the longest cocoons, the surfaces of the cocoons grooves and the two grooves are smooth and have no burrs, and cocoons are not wound when rolling in the cocoons; the cocoon grooves are designed into circular arcs, so that cocoons can automatically move towards the circular arc bottoms in the rolling process, and two smaller cocoons are prevented from being simultaneously arranged in one groove, but the flat bottom grooves are not arranged; the surfaces of the rolling rod and ribs on the rolling rod are black to absorb light, so that light can not be reflected, interference of other light reflecting devices on the light information on the surface of the silkworm cocoons collected by a camera is avoided, black rubber is sleeved outside the rolling rod to serve as a black light absorbing material layer, or the rolling rod and the ribs are integrally formed by black rubber through a die; the bottom of the conveyer belt is provided with a supporting plate 14 below each cocoon groove of the rolling rod 5, a gap is arranged between each supporting plate 14 below the ribs 5-1, the gap can ensure that the top of the groove of the rolling rod 5 is not touched, and meanwhile, a chain is supported by a chain guide rail of the conveyer belt; the gap between the most concave part of the cocoon groove of the rolling rod 5 and the supporting plate 14 is 3-5mm, wherein a=4mm (in other embodiments, any value from 3mm to 5mm can be adopted), so that the rolling rod 5 can freely rotate and the cocoons 20 cannot be plugged into the gap; the support plate is a flat plate with a black light absorption surface, light can not be reflected, interference of other light reflecting devices on the light information on the cocoon surface collected by the camera is avoided, and a layer of black heat shrinkage tube is sleeved outside the flat plate to serve as a black light absorption material film. The silk cocoon grooves are formed by arranging ribs 5-1 on the length distance of each silk cocoon on the rolling rod 5, and the silk cocoons which are not thoroughly separated by the stripping wheel on the conveying belt are arranged in the grooves of the rolling rod 5 by combining the supporting plate 14 below and the stripping wheel 4 above and rotating in the opposite direction of the conveying belt, so that more than one silk cocoon contacted with the rolling rod 5 can be fallen into the rear rolling rod interval due to the fact that the rolling rod 5 moves obliquely upwards and rotates reversely, only one silk cocoon is finally left, and the thorough separation of the silk cocoons is realized.
The conveyer belt comprises hollow chains 2 at two sides of the motor 9, friction wheels 5-2 are fixed at two ends of a rolling rod 5, the friction wheels 5-2 and the rolling rod 5 are integrally formed, the axle center of the friction wheels 5-2 is connected with a long pin shaft 16 through a bearing 15, and the long pin shaft 16 is connected with pin holes of the hollow chains 2; two sides of the conveyor belt are respectively provided with a friction plate 13 on the top of the friction wheel 5-2, wherein the friction plates are used for friction with the friction wheel when the rolling rod runs obliquely upwards; when the motor 2 drives the chain to drive the rolling rod 5 to move obliquely upwards, the friction wheel 5-2 also moves obliquely upwards, friction is generated by the friction wheel 5-2 and the friction plate 13, so that the friction wheel 5-2 rotates in the opposite direction, namely anticlockwise rotation in view, and the friction wheel 5-2 drives the whole rolling rod 5 to move obliquely upwards and simultaneously rotates reversely; through the inclined arrangement of the conveying belt, the dead weight of the cocoons 20 is combined with the counterclockwise rotation of the rolling rod 5 and the inclined upward uniform motion, the cocoons 20 can slowly rotate at uniform speed for one circle in the cocoons grooves of the rolling rod 5, and the image collector 6 can collect complete image information of the cocoons for the complete circle so as to accurately judge the quality of the cocoons.
The hollow chain 2 of the conveyer belt is arranged on a triangle frame 1, the qualified product conveying channel 8 is positioned at the tail end of the conveyer belt, and the hollow chain 2 below the tail end of the conveyer belt inclines downwards into the frame 1 to accommodate the qualified product conveying channel 8 and enable the qualified cocoons 20 to smoothly fall; the unqualified product conveying channel 7 is provided with at least two channels, in this case four channels, which are sequentially arranged below the rear section of the conveying belt, the top of the unqualified product conveying channel 7 is hinged with a hinge baffle 10 at the position of each supporting plate of the conveying belt, and the hinge baffle 10 drives the hinge baffle 10 to open and close through a micro cylinder 11 below the hinge baffle. At least two unqualified product conveying channels 7 are connected with a micro cylinder 11 for driving the hinge baffle plates to open and close through hinged hinge baffle plates 10, when the unqualified silkworm cocoons are judged to pass through, the hinge baffle plates 10 are opened to fall into the unqualified product conveying channels 7, the qualified silkworm cocoons are discharged to the qualified product conveying channels 8 at the tail end of the conveying belt, and the unqualified products can fall out of the different unqualified product conveying channels 7 according to different flaws, so that grading sorting is realized.
The sorting process comprises the following steps: under the drive of a motor 9, the hollow chain 2 moves obliquely upwards with the rolling rods 5, cocoons 20 on the blanking plate 3 slide into the interval between the two rolling rods 5 along a slope, the supporting plate 14 below the rolling rods 5 holds cocoons and does not fall off, the peeling wheel 4 rotating in the opposite direction to the movement direction of the hollow chain 2 dials cocoons piled up and passes through the rolling rods, meanwhile, the friction wheel 5-2 connected to the rolling rods on the hollow chain 2 drives the rolling rods 5 to rotate in the anticlockwise direction as shown in the figure under the action of the upper friction plate 13, the cocoons 20 on the supporting plate are pushed by the rolling rods 5 rotating reversely to rotate at a constant speed in the opposite direction of the rolling rods and roll upwards, the image collector 6 above photographs the rolled cocoons 20 for a plurality of times, images of the cocoons rotating completely and are collected, the cocoons are analyzed and identified through the image processing controller, the cocoons are judged to be of the quality, the cocoons are opened through the micro air cylinder 11, different cocoons in the interval are passed through the baffle plates 10, and the cocoons with the quality of the finished products which are failed products which fall into the hinge plates 10 along with the hinge strips 7, and the finished products which are conveyed through the hinge strips 8, and the finished products which fall into the acceptable products are conveyed through the hinge strips 8.
The cocoon climbing sorting method solves the problem that cocoons are difficult to thoroughly separate, easily separates cocoon clusters into individual cocoons, simultaneously enables the individual cocoons to slowly rotate at a uniform speed for one week, collects image information of the whole cocoons for one week, realizes the individual automatic sorting of cocoons, and is suitable for wide popularization.
Claims (6)
1. The utility model provides a silk cocoon climbing sorting method, includes using a wave to roll pole climbing silk cocoon sorter to select separately the silk cocoon, wave rolls pole climbing silk cocoon sorter includes the rotatory shell wheel of taking the blade on the conveyer belt anterior segment, is perpendicular to the conveyer belt top is equipped with image acquisition ware, unqualified products conveying channel and the qualified products conveying channel that sets up on the conveyer belt, its characterized in that: the conveying belt is obliquely arranged and comprises a plurality of rolling rods which obliquely and upwards convey cocoons and reversely spin, ribs with rounded bottoms are radially distributed on the length of each cocoon on the rolling rods at intervals to form a plurality of arc cocoon grooves, a supporting plate is respectively arranged at the bottom of the conveying belt below each cocoon groove of the rolling rod, and a gap is reserved between each supporting plate and the lower part of each rib; the rotation direction of the stripping wheel is opposite to the conveying direction of the conveying belt;
the qualified product conveying channel is positioned at the tail end of the conveying belt, and the unqualified product conveying channel is arranged below the rear section of the conveying belt; hinge baffles are hinged to the top of the unqualified product conveying channel at the position of each supporting plate of the conveying belt, and the hinge baffles are driven to open and close by micro cylinders below the hinge baffles;
the sorting method comprises the following steps: the rolling rods move obliquely upwards, cocoons slide into the interval between the two rolling rods from the front end of the conveying belt, the supporting plate below the rolling rods supports cocoons, the stripping wheel rotates in the opposite direction to the conveying direction of the conveying belt, cocoons piled up higher than the rolling rods are pulled out and only allow cocoons in the interval of the rolling rods to pass through, meanwhile, the rolling rods rotating reversely push cocoons on the supporting plate at uniform speed in the opposite direction of the rolling rods and roll upwards, the image collector above the rolling rods photographs the rolled cocoons for a plurality of times, images of the whole circle of rotations of the cocoons are collected, the image processing controller analyzes and identifies the characteristics of the cocoons and judges the quality of the cocoons, the unqualified cocoons fall into a unqualified product channel, and the qualified cocoons fall into the qualified product conveying channel after moving to the tail end of the conveying belt along with the rolling rods.
2. The method for sorting cocoons by climbing slopes according to claim 1, wherein: the conveying belt comprises hollow chains at two sides driven by a motor, friction wheels are fixed at two ends of the rolling rod, the axle center of each friction wheel is connected with a long pin shaft through a bearing, and the long pin shafts are connected with the hollow chains; and friction plates which are used for friction with the friction wheels when the rolling rods run obliquely upwards are respectively arranged on the tops of the friction wheels on two sides of the conveying belt.
3. The cocoon climbing sorting method according to claim 1 or 2, characterized in that: the unqualified product conveying channels are at least two, and are sequentially arranged at the rear section of the conveying belt.
4. The cocoon climbing sorting method according to claim 2, characterized in that: the hollow chain is arranged on a triangle frame, and the hollow chain below the tail end of the conveying belt is inclined downwards into the frame.
5. A method for sorting cocoons on a climbing slope according to claim 3, wherein: and the surfaces of the rolling rod, the ribs on the rolling rod and the supporting plate are black and light-absorbing.
6. The method for sorting cocoons by climbing slopes according to claim 4, wherein: and the surfaces of the rolling rod, the ribs on the rolling rod and the supporting plate are black and light-absorbing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210186668.4A CN114558790B (en) | 2022-02-28 | 2022-02-28 | Silk cocoon climbing sorting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210186668.4A CN114558790B (en) | 2022-02-28 | 2022-02-28 | Silk cocoon climbing sorting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114558790A CN114558790A (en) | 2022-05-31 |
| CN114558790B true CN114558790B (en) | 2024-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210186668.4A Active CN114558790B (en) | 2022-02-28 | 2022-02-28 | Silk cocoon climbing sorting method |
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| JPH09173993A (en) * | 1995-12-28 | 1997-07-08 | Ishii Ind Co Ltd | Fruit vegetable rotating device |
| CN203720102U (en) * | 2014-01-02 | 2014-07-16 | 洛阳久德轴承模具技术有限公司 | Image detection device for detecting surface defects of rolling body |
| CN107413678A (en) * | 2017-09-19 | 2017-12-01 | 郑州市中昕智能设备有限公司 | A kind of red date intelligent picking equipment |
| CN109047004A (en) * | 2018-06-27 | 2018-12-21 | 天津大学 | Ball rejected product elimination method |
| CN208944614U (en) * | 2018-09-30 | 2019-06-07 | 郑州市中昕智能设备有限公司 | A kind of quick, intelligent picking equipment of high-precision vegetables and fruits |
| CN110125021A (en) * | 2019-06-25 | 2019-08-16 | 北京工业大学 | A kind of silk cocoon automatic sorting device |
| CN113182203A (en) * | 2021-05-17 | 2021-07-30 | 柳州市诚明科技有限公司 | Intelligent silkworm cocoon sorting method |
| CN113798212A (en) * | 2021-08-26 | 2021-12-17 | 深圳同益新中控实业有限公司 | Silkworm cocoon pretreatment equipment and pretreatment process thereof |
| CN216827288U (en) * | 2022-02-28 | 2022-06-28 | 柳州市诚明科技有限公司 | Wave rolling rod climbing silkworm cocoon sorting machine |
-
2022
- 2022-02-28 CN CN202210186668.4A patent/CN114558790B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09173993A (en) * | 1995-12-28 | 1997-07-08 | Ishii Ind Co Ltd | Fruit vegetable rotating device |
| CN203720102U (en) * | 2014-01-02 | 2014-07-16 | 洛阳久德轴承模具技术有限公司 | Image detection device for detecting surface defects of rolling body |
| CN107413678A (en) * | 2017-09-19 | 2017-12-01 | 郑州市中昕智能设备有限公司 | A kind of red date intelligent picking equipment |
| CN109047004A (en) * | 2018-06-27 | 2018-12-21 | 天津大学 | Ball rejected product elimination method |
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| CN113798212A (en) * | 2021-08-26 | 2021-12-17 | 深圳同益新中控实业有限公司 | Silkworm cocoon pretreatment equipment and pretreatment process thereof |
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| CN114558790A (en) | 2022-05-31 |
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