CN111642250A - Novel corn threshing cylinder - Google Patents
Novel corn threshing cylinder Download PDFInfo
- Publication number
- CN111642250A CN111642250A CN202010553475.9A CN202010553475A CN111642250A CN 111642250 A CN111642250 A CN 111642250A CN 202010553475 A CN202010553475 A CN 202010553475A CN 111642250 A CN111642250 A CN 111642250A
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- threshing
- roller
- sheet
- section
- mounting seat
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
- A01F12/00—Parts or details of threshing apparatus
- A01F12/18—Threshing devices
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
- A01F11/00—Threshing apparatus specially adapted for maize; Threshing apparatus specially adapted for particular crops other than cereals
- A01F11/06—Threshing apparatus specially adapted for maize; Threshing apparatus specially adapted for particular crops other than cereals for maize, e.g. removing kernels from cobs
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- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Threshing Machine Elements (AREA)
Abstract
The invention provides a novel corn threshing cylinder, which adopts a threshing element with a brand-new structure and improves the distribution structure and the fixed mode of the threshing element. Specifically, the pushing threshing slice with the connecting plate is inserted into the groove-shaped mounting seat and fastened through the round-head bolt and the matched through hole, the lower end of the groove-shaped mounting seat is provided with the square connecting part which is inserted and matched with the square hole on the roller, the lower end of the square connecting part is provided with the external thread part, and the square connecting part is fastened on the surface of the roller through the nut and the gasket, so that the pushing threshing slice is fixed on the periphery of the roller at a specific angle. The pushing threshing sheet is of an elastic structure, the periphery of the pushing threshing sheet is a round angle, and mechanical damage to grains can be effectively relieved. The outer edge of the push threshing sheet is positioned on the circumference concentric with the roller, which is beneficial to ensuring consistent threshing clearance; the inner edge is gradually far away from the surface of the roller along the joint, so that the rigidity of the push threshing sheet along the length direction is reduced, and the deformation adaptability of the push threshing sheet is improved.
Description
Technical Field
The invention relates to the technical field of corn threshing, in particular to a novel corn threshing cylinder.
Background
In the processing industry of grains such as soybean, corn, rice and the like, threshing is a necessary prerequisite for all deep processing means; in the case of corn, the corn processing technology of rolling corn kernels from a corn cob has been used from old times. Recently, with the development of the mechanical industry, mechanized corn threshing devices have been gradually produced.
The corn thresher mainly comprises a roller, a concave plate, a sieve, a fan, a feeding hopper, a seed sliding plate, a spiral guide rod and the like. The corn ears enter the roller through the feeding hopper and are threshed under the impact of the high-speed rotary roller and the interaction of the corn ears, the roller and the concave plate. Most of the seeds and fine impurities are cleaned by the fan through the concave holes. The light impurities are blown out from the impurity discharge port, and the seeds slide out of the machine by the seed slide plate. The cob moves backwards along the axial direction of the roller, is discharged out of the machine through the surface of the vibrating sieve from an outlet at the shaft end, and partial grains carried in the cob leak down through the sieve holes and enter the grain sliding plate to slide out of the machine. Therefore, the impact, extrusion and friction of the roller on the corn ear in the rotating state are direct mechanical effects for realizing threshing.
In the prior art, in order to ensure the effects of impact, extrusion, friction and the like, grooves or fixed protrusions are required to be formed on the surface of the roller, and at present, the structures are all rigid structures, so that grains are easily broken in the process of contacting with corns, and the yield of finished products is seriously influenced. Then, whether to adopt the elastic structure to alleviate this problem, there is no prior art that can be referred to in the prior art; more importantly, how to not influence threshing efficiency while relieving hard impact is also a technical problem to be solved.
Disclosure of Invention
The invention aims to overcome the technical defects in the prior art, and provides a novel corn threshing cylinder to solve the technical problem that the conventional threshing cylinder is easy to cause mechanical damage to grains due to rigid collision in the prior art.
The invention aims to solve another technical problem of how to ensure higher threshing efficiency while relieving mechanical damage of the roller to grains.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a novel corn threshing cylinder comprises a cylinder and a threshing element, wherein the cylinder comprises a first section and a second section which are connected with each other, and the length of the second section is not less than 3 times of the length of the first section; the threshing element comprises a groove-shaped mounting seat, a first through hole, a square connecting part, an external thread part, a connecting plate, a second through hole, a pushing threshing sheet and a round-head bolt, wherein the first through hole is formed in the side end of the groove-shaped mounting seat in a penetrating mode, the square connecting part is fixedly connected to the lower end of the groove-shaped mounting seat, the external thread part is arranged at the lower end of the square connecting part, the second through hole is formed in the connecting plate in a penetrating mode, the pushing threshing sheet is fixedly connected to the side end of the connecting plate, the connecting plate is inserted into the groove-shaped mounting seat in a penetrating mode, and the round-head bolt penetrates through the first through hole and the second through hole and fixes the; the roller is provided with a square hole, the square connecting part is positioned in the square hole, the groove-shaped mounting seat is positioned on the outer surface of the roller, the nut is fixedly connected with the external thread part through a screw thread, and a gasket is arranged between the nut and the roller in a cushioning manner; the threshing elements are distributed on the roller along a spiral line, the spiral angle of the spiral line is 32-38 degrees in the first section, and the spiral angle of the spiral line is 15-22 degrees in the second section.
Preferably, the length of the second section is 3 to 5 times the length of the first section.
Preferably, the edge contour lines of the push threshing sheet are all arc lines and are tangent to each other.
Preferably, the round head portion of the round head bolt faces the rotation direction of the drum.
Preferably, the top end of the connecting plate is 12-16 mm higher than the top end of the groove-shaped mounting seat.
Preferably, the push-release sheet is made of an elastic material.
Preferably, a push threshing sheet is fixedly connected to only one side of the connecting plate. The configuration is similar to a fin shape, the outer edge of the configuration is positioned on the circumference concentric with the roller, the inner edge of the configuration is outwards gradually far away from the surface of the roller along the joint, the periphery of the configuration is of an arc structure, and the push threshing sheet is made of elastic materials and is allowed to deform in the length direction.
Preferably, the two sides of the connecting plate are respectively and fixedly connected with a pushing threshing sheet. The configuration is a symmetrical structure, the outer edge is positioned on the circumferential surface concentric with the roller, the inner edge is outwards and gradually away from the surface of the roller along the joint, the periphery of the inner edge is of a circular arc structure, and the inner edge is made of elastic materials.
In the technical scheme, the roller is used for bearing and fixing the threshing element, and is driven by the rotating shaft to rotate, so that the threshing element on the roller is driven to rotate, and the corn is impacted and rubbed, so that the threshing purpose is realized; on the roller, the threshing elements are distributed in a spiral line; on the roller, the roller is divided into a first section and a second section along the axis, wherein the length of the first section is l1The length of the second section is l2，l2≥(3～5)l1Specifically, the helix angle 90- α of the helix angle on the first section is 32-38 degrees, and the helix angle 90- β of the helix angle on the second section is 15-22 degrees, so that the corn ear can be grabbed and the smoothness of the corn ear entering a threshing gap can be improved, and meanwhile, the helix angle on the first section is set to be different from that on the second section, and the helix angle on the first section is 90- α degrees2≥(3～5)l1The ratio of (A) to (B) strengthens the threshing strength of the rear section to the fruit ears, and reduces the threshing loss; in the specific structure of the threshing element, the groove-shaped mounting seat is used for inserting the connecting plate, and the connecting plate and the groove-shaped mounting seat are fastened after the round-head bolt penetrates through the first through hole and the second through hole, so that the bearing and fixing effects on the pushing threshing sheet are realized; the push-press threshing sheet is of an elastic structure, so that the push-press threshing sheet can be flexibly inserted along a grain combination gap, and the crack damage to grains is reduced; the outer edge of the push threshing sheet is positioned on the circumference concentric with the roller, which is beneficial to ensuring consistent threshing clearance; inner edgeThe part is gradually far away from the surface of the roller along the joint, so that the rigidity of the push threshing sheet along the length direction is reduced, and the deformation adaptability of the push threshing sheet is improved; the periphery of the pushing threshing sheet is of a round angle structure, the round head of the round head bolt is located in the rotating direction of the roller, and the pushing threshing sheet is 12-16 mm higher than the mounting seat; the push threshing sheet has two configurations, namely a fin type configuration and a symmetrical type configuration, so that the working requirements of different users and different threshing objects can be met; the square connecting part is used for being matched with the square hole on the surface of the roller in an inserting way, so that the direction of the threshing element can be determined, and the mounting quality is improved; the external thread part is used for connecting the nut thread thereon; the nut and the washer are used to fix the threshing element to the drum.
The invention provides a novel corn threshing cylinder, which adopts a threshing element with a brand-new structure and improves the distribution structure and the fixed mode of the threshing element. Specifically, the pushing threshing slice with the connecting plate is inserted into the groove-shaped mounting seat and fastened through the round-head bolt and the matched through hole, the lower end of the groove-shaped mounting seat is provided with the square connecting part which is inserted and matched with the square hole on the roller, the lower end of the square connecting part is provided with the external thread part, and the square connecting part is fastened on the surface of the roller through the nut and the gasket, so that the pushing threshing slice is fixed on the periphery of the roller at a specific angle. The pushing threshing sheet is of an elastic structure, the periphery of the pushing threshing sheet is a round angle, and mechanical damage to grains can be effectively relieved. The outer edge of the push threshing sheet is positioned on the circumference concentric with the roller, which is beneficial to ensuring consistent threshing clearance; the inner edge is gradually far away from the surface of the roller along the joint, so that the rigidity of the push threshing sheet along the length direction is reduced, and the deformation adaptability of the push threshing sheet is improved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the threshing element after the push threshing sheet is removed;
FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;
FIG. 4 is a schematic illustration of a push-to-release sheet when in a single-sided configuration;
FIG. 5 is a schematic illustration of a push-to-release sheet when in a two-sided configuration;
fig. 6 is a schematic view of the threshing element where it is mounted on the drum;
in the figure:
1. the threshing device comprises a roller 2, a first section 3, a second section 4, a threshing element 5, a groove-shaped mounting seat 6, a first through hole 7, a square connecting part 8, an external thread part 9, a connecting plate 10, a second through hole 11, a pushing threshing piece 12, a round head bolt 13, a square hole 14, a nut 15 and a gasket.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described in detail. Well-known structures or functions may not be described in detail in the following embodiments in order to avoid unnecessarily obscuring the details. Approximating language, as used herein in the following examples, may be applied to identify quantitative representations that could permissibly vary in number without resulting in a change in the basic function. Unless defined otherwise, technical and scientific terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Example 1
A novel corn threshing cylinder, as shown in figures 1, 2, 3, 4 and 6, comprising a cylinder 1 and a threshing element 4, wherein the cylinder 1 comprises a first section 2 and a second section 3 which are connected with each other, and the length of the second section 3 is 3 times of the length of the first section 2; the threshing element 4 comprises a groove-shaped mounting seat 5, a first through hole 6, a square connecting part 7, an external threaded part 8, a connecting plate 9, a second through hole 10, a pushing threshing sheet 11 and a round-head bolt 12, wherein the through first through hole 6 is formed at the side end of the groove-shaped mounting seat 5, the square connecting part 7 is fixedly connected to the lower end of the groove-shaped mounting seat 5, the external threaded part 8 is arranged at the lower end of the square connecting part 7, the through second through hole 10 is formed in the connecting plate 9, the pushing threshing sheet 11 is fixedly connected to the side end of the connecting plate 9, the connecting plate 9 is inserted in the groove-shaped mounting seat 5, the round-head bolt 12 penetrates through the first through hole 6 and the second through hole 10, and the connecting plate 9 and the groove-shaped mounting seat 5; a square hole 13 is formed in the roller 1, the square connecting part 7 is positioned in the square hole 13, the groove-shaped mounting seat 5 is positioned on the outer surface of the roller 1, the nut 14 is fixedly connected with the external thread part 8 through a screw, and a gasket 15 is arranged between the nut 14 and the roller 1 in a cushioning manner; the threshing elements 4 are distributed on the roller 1 along a spiral line, the spiral angle of the spiral line is 32-38 degrees in the first section 2, and the spiral angle of the spiral line is 15-22 degrees in the second section 3. Wherein, the edge contour lines of the pushing threshing sheets 11 are all arc lines and are tangent with each other. The round head of the round head bolt 12 faces the rotation direction of the drum 1. The top end of the connecting plate 9 is 12mm higher than the top end of the groove-shaped mounting seat 5. The push-press threshing sheet 11 is made of an elastic material. Only one side of the connecting plate 9 is fixedly connected with a push threshing sheet 11.
The device has the following structural characteristics: the roller 1 is used for bearing and fixing the threshing element 4, and the roller 1 is driven by the rotating shaft to rotate so as to drive the threshing element 4 on the roller to rotate and play roles of impacting and rubbing the corn, thereby realizing the purpose of threshing; on the roller 1, the threshing elements 4 are distributed in a spiral line; on the drum 1, the drum is divided along the axis into a first section 2 and a second section 3, wherein the first section 2 has a length l1The length of the second section 3 is l2，l2≥(3～5)l1The spiral lines at different positions are set to be different spiral angles by dividing the first section 2 and the second section 3, specifically, the spiral angle 90- α of the spiral line positioned on the first section 2 is 32-38 degrees, the spiral angle 90- β of the spiral line positioned on the second section 3 is 15-22 degrees, based on the configuration, the corn ear can be grabbed, the smoothness of the corn ear entering a threshing gap is improved, and meanwhile, the spiral line at different positions is divided into the first section 2 and the second section 32≥(3～5)l1The ratio of (A) to (B) strengthens the threshing strength of the rear section to the fruit ears, and reduces the threshing loss; in the specific structure of the threshing element 4, the groove-shaped mounting seat 5 is used for inserting the connecting plate 9 therein, and the round-head bolt 12 penetrates through the first through hole 6 and the second through hole 10 to fasten the connecting plate 9 and the groove-shaped mounting seat 5, so that the bearing and fixing effects on the pushing and pressing threshing sheet 11 are realized; the push-press threshing sheet 11 is of an elastic structure, so that the push-press threshing sheet can be flexibly inserted along a grain combination gap, and the crack damage to grains is reduced; the outer edge of the push threshing sheet 11 is positioned on the circumference concentric with the roller 1, which is beneficial to ensuring consistent threshing clearance; the inner edge is gradually away from the surface of the roller 1 outwards along the joint, and the threshing is reduced and pushedThe rigidity of the sheet 11 along the length direction improves the deformation adaptability; the periphery of the pushing threshing sheet 11 is all in a round angle structure, the round head of the round head bolt 12 is located in the rotating direction of the roller 1, and the pushing threshing sheet 11 is 512-16 mm higher than the groove-shaped mounting seat; the push threshing sheet 11 has two configurations, namely a fin type configuration and a symmetrical type configuration, and can meet the working requirements of different users and different threshing objects; the square connecting part 7 is used for being matched with the square hole 13 on the surface of the roller 1 in an inserting way, so that the direction of the threshing element 4 can be determined conveniently, and the mounting quality is improved; the external thread part 8 is used for screwing a nut 14 thereon; the nut 14 and the washer 15 are used to fix the threshing element 4 to the drum 1.
Example 2
A novel corn threshing cylinder, as shown in figures 1, 2, 3, 5 and 6, comprising a cylinder 1 and a threshing element 4, wherein the cylinder 1 comprises a first section 2 and a second section 3 which are connected with each other, and the length of the second section 3 is 5 times of the length of the first section 2; the threshing element 4 comprises a groove-shaped mounting seat 5, a first through hole 6, a square connecting part 7, an external threaded part 8, a connecting plate 9, a second through hole 10, a pushing threshing sheet 11 and a round-head bolt 12, wherein the through first through hole 6 is formed at the side end of the groove-shaped mounting seat 5, the square connecting part 7 is fixedly connected to the lower end of the groove-shaped mounting seat 5, the external threaded part 8 is arranged at the lower end of the square connecting part 7, the through second through hole 10 is formed in the connecting plate 9, the pushing threshing sheet 11 is fixedly connected to the side end of the connecting plate 9, the connecting plate 9 is inserted in the groove-shaped mounting seat 5, the round-head bolt 12 penetrates through the first through hole 6 and the second through hole 10, and the connecting plate 9 and the groove-shaped mounting seat 5; a square hole 13 is formed in the roller 1, the square connecting part 7 is positioned in the square hole 13, the groove-shaped mounting seat 5 is positioned on the outer surface of the roller 1, the nut 14 is fixedly connected with the external thread part 8 through a screw, and a gasket 15 is arranged between the nut 14 and the roller 1 in a cushioning manner; the threshing elements 4 are distributed on the roller 1 along a spiral line, the spiral angle of the spiral line is 32-38 degrees in the first section 2, and the spiral angle of the spiral line is 15-22 degrees in the second section 3. Wherein, the edge contour lines of the pushing threshing sheets 11 are all arc lines and are tangent with each other. The round head of the round head bolt 12 faces the rotation direction of the drum 1. The top end of the connecting plate 9 is 16mm higher than the top end of the groove-shaped mounting seat 5. The push-press threshing sheet 11 is made of an elastic material. The two sides of the connecting plate 9 are respectively and fixedly connected with a push threshing sheet 11.
The embodiments of the present invention have been described in detail, but the description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention. Any modification, equivalent replacement, and improvement made within the scope of the application of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A novel corn threshing cylinder is characterized by comprising a cylinder (1) and a threshing element (4), wherein the cylinder (1) comprises a first section (2) and a second section (3) which are connected with each other, and the length of the second section (3) is not less than 3 times of the length of the first section (2); the threshing element (4) comprises a groove-shaped mounting seat (5), a first through hole (6), a square connecting part (7), an external thread part (8), a connecting plate (9), a second through hole (10), a pushing threshing sheet (11) and a round-head bolt (12), wherein, a first through hole (6) which is penetrated is arranged at the side end of the groove-shaped mounting seat (5), a square connecting part (7) is fixedly connected at the lower end of the groove-shaped mounting seat (5), the lower end of the square connecting part (7) is provided with an external thread part (8), the connecting plate (9) is provided with a second through hole (10) which penetrates through the connecting plate, a push threshing sheet (11) is fixedly connected at the side end of the connecting plate (9), the connecting plate (9) is inserted in the groove-shaped mounting seat (5), the round head bolt (12) penetrates through the first through hole (6) and the second through hole (10), and the connecting plate (9) and the groove-shaped mounting seat (5) are fixed; a square hole (13) is formed in the roller (1), the square connecting part (7) is positioned in the square hole (13), the groove-shaped mounting seat (5) is positioned on the outer surface of the roller (1), the nut (14) and the external thread part (8) are fixedly connected through threads, and a gasket (15) is arranged between the nut (14) and the roller (1) in a cushioning manner; the threshing elements (4) are distributed on the roller (1) along a spiral line, the spiral angle of the spiral line is 32-38 degrees in the first section (2), and the spiral angle of the spiral line is 15-22 degrees in the second section (3).
2. A new type of corn threshing cylinder according to claim 1, characterised in that the length of the second section (3) is 3-5 times the length of the first section (2).
3. The new corn threshing cylinder according to claim 1, characterized in that the edge contour lines of the pushing threshing sheet (11) are all arc lines and tangent to each other.
4. A new type of corn threshing cylinder according to claim 1, characterized in that the round head of the round head bolt (12) is oriented in the direction of rotation of the cylinder (1).
5. The novel corn threshing cylinder according to claim 1, characterized in that the top end of the connecting plate (9) is 12-16 mm higher than the top end of the groove-shaped mounting seat (5).
6. The new corn threshing cylinder according to claim 1, characterized in that the push threshing cylinder (11) is made of elastic material.
7. The new corn threshing cylinder according to claim 1, characterized in that only one side of the connecting plate (9) is fixedly connected with a push threshing sheet (11).
8. The new corn threshing cylinder according to claim 1, characterized in that the pushing threshing sheet (11) is fixedly connected to each side of the connecting plate (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010553475.9A CN111642250B (en) | 2020-06-17 | 2020-06-17 | Corn threshing cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010553475.9A CN111642250B (en) | 2020-06-17 | 2020-06-17 | Corn threshing cylinder |
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| Publication Number | Publication Date |
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| CN111642250A true CN111642250A (en) | 2020-09-11 |
| CN111642250B CN111642250B (en) | 2022-07-15 |
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| CN202010553475.9A Active CN111642250B (en) | 2020-06-17 | 2020-06-17 | Corn threshing cylinder |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3426760A (en) * | 1965-11-23 | 1969-02-11 | Massey Ferguson Inc | Toothed conical threshing assembly |
| JPH09233934A (en) * | 1996-02-29 | 1997-09-09 | Yanmar Agricult Equip Co Ltd | Grain threshing machine |
| JPH104767A (en) * | 1996-06-19 | 1998-01-13 | Yanmar Agricult Equip Co Ltd | Threshing apparatus |
| JPH1128018A (en) * | 1997-07-10 | 1999-02-02 | Kubota Corp | Threshing drum structure of threshing apparatus |
| US20090042624A1 (en) * | 2007-08-07 | 2009-02-12 | Flickinger Wayne T | Combine Rotor Assembly With Progressive Pitch Element Pattern |
| CN102308706A (en) * | 2010-07-02 | 2012-01-11 | 钱慧君 | Roller of rice and wheat threshing machine |
| CN203834748U (en) * | 2014-04-17 | 2014-09-17 | 刘思余 | Plate body connecting mechanism |
| CN205336924U (en) * | 2015-12-06 | 2016-06-29 | 成都大学 | Prevent blocking and rub formula threshing drum device |
| CN108990558A (en) * | 2018-08-08 | 2018-12-14 | 山东理工大学 | Maize harvesting machine soft threshing platen |
-
2020
- 2020-06-17 CN CN202010553475.9A patent/CN111642250B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3426760A (en) * | 1965-11-23 | 1969-02-11 | Massey Ferguson Inc | Toothed conical threshing assembly |
| JPH09233934A (en) * | 1996-02-29 | 1997-09-09 | Yanmar Agricult Equip Co Ltd | Grain threshing machine |
| JPH104767A (en) * | 1996-06-19 | 1998-01-13 | Yanmar Agricult Equip Co Ltd | Threshing apparatus |
| JPH1128018A (en) * | 1997-07-10 | 1999-02-02 | Kubota Corp | Threshing drum structure of threshing apparatus |
| US20090042624A1 (en) * | 2007-08-07 | 2009-02-12 | Flickinger Wayne T | Combine Rotor Assembly With Progressive Pitch Element Pattern |
| CN102308706A (en) * | 2010-07-02 | 2012-01-11 | 钱慧君 | Roller of rice and wheat threshing machine |
| CN203834748U (en) * | 2014-04-17 | 2014-09-17 | 刘思余 | Plate body connecting mechanism |
| CN205336924U (en) * | 2015-12-06 | 2016-06-29 | 成都大学 | Prevent blocking and rub formula threshing drum device |
| CN108990558A (en) * | 2018-08-08 | 2018-12-14 | 山东理工大学 | Maize harvesting machine soft threshing platen |
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|---|---|
| CN111642250B (en) | 2022-07-15 |
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