CN112531954B - Shell assembly and motor using same - Google Patents
Shell assembly and motor using same Download PDFInfo
- Publication number
- CN112531954B CN112531954B CN202011457849.3A CN202011457849A CN112531954B CN 112531954 B CN112531954 B CN 112531954B CN 202011457849 A CN202011457849 A CN 202011457849A CN 112531954 B CN112531954 B CN 112531954B
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- motor
- bottom plate
- assembly
- shell
- side wall
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
Abstract
The invention discloses a shell assembly and a motor using the same, and the shell assembly comprises a motor shell and a motor shaft, wherein the motor shell is of a barrel-shaped structure with one open end formed by a bottom plate and a side wall arranged around the bottom plate; the thickness t1 of the step is equal to the thickness t2 of the base plate. According to the shell assembly and the motor using the same, the raised step is arranged at the center of the bottom plate, the thickness t1 of the step is equal to the thickness t2 of the bottom plate, when the motor shaft is matched with the shaft hole, a chamfer transition area can be reserved between the lower surface of the step and the lower surface of the bottom plate, so that after the motor shaft is riveted with the motor shell, the effective contact length is increased, and the riveting fixing strength of the motor shaft and the motor shell is improved.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a shell assembly and a motor using the same.
Background
Motors are widely used in household appliances. As shown in fig. 1, the general electric machine mainly includes a housing assembly 1, a rotor assembly 3, a stator assembly 2, a nameplate 11, and the like. As shown in fig. 2, the housing assembly 1 is composed of a motor case 101 and a motor shaft 102; the motor shell is provided with a shaft hole 10112, and the motor shaft 102 is riveted and fixed in the shaft hole of the motor shell 101; the motor shaft 102 is used for fixing the rotor assembly 3;
in the motor of the prior art, the bottom of the motor casing 101 is a planar structure, and the shaft hole 10112 of the motor casing 101 is located on the bottom plane of the motor casing 101, as shown in fig. 3. Because the nameplate needs to be adhered to the bottom of the motor shell, after the motor shell and the motor shaft are riveted, the end face of the motor shaft is flush with the bottom plane of the motor shell, or the end face of the motor shaft is positioned within the bottom plane of the motor shell; because the end face of the motor shaft is provided with the chamfer 1021, the effective contact length L of the motor shaft and the motor shell is smaller than the wall thickness of the motor shell; can lead to motor shaft and motor casing fixed strength low like this, and casing assembly is at circulation in-process and the long-term operation back of motor, and the phenomenon that the motor shaft often can appear becoming flexible or drop leads to the motor to produce the noise or the motor is inefficacy.
Disclosure of Invention
In order to solve the technical problem that the fixing strength of the motor shaft and the motor shell is low due to the fact that the effective contact length of the motor shaft and the motor shell is too small in the prior art, the invention provides a shell assembly and a motor using the shell assembly to solve the problem.
The invention provides a shell assembly, which comprises a motor shell and a motor shaft, wherein the motor shell is of a barrel-shaped structure with one open end and is composed of a bottom plate and a side wall arranged around the bottom plate; the thickness t1 of the step is equal to the thickness t2 of the base plate.
Preferably, the height difference h2 between the end surface provided with the chamfer on the motor shaft and the lower surface of the step is larger than or equal to the radius r of the chamfer.
Furthermore, polar claws extending towards the opening end direction of the motor casing are arranged on the bottom plate positioned on the periphery of the step, and polar claw holes are formed in the bottom plate positioned on one side of each polar claw.
Preferably, the height difference h1 between the lower surface of the step and the lower surface of the bottom plate is greater than or equal to the height difference h2 between the end surface provided with the chamfer on the motor shaft and the lower surface of the step.
Further, a first annular pressure relief groove is formed in the bottom plate at the connection position with the side wall.
Preferably, the pole claw is formed by punching and bending the material of the bottom plate.
Furthermore, a first pressure reduction groove is formed in the connecting position of the bottom plate and the polar claw.
Preferably, the side wall is of a cylindrical structure, and the center of the shaft hole coincides with the circle center of the side wall.
The invention also provides a motor which comprises a cover plate, a stator component, a rotor group and the shell component, wherein the cover plate covers the opening end of the motor shell, the rotor component and the stator component are both positioned in the motor shell, the rotor component is sleeved on the motor shaft, the stator component is sleeved on the periphery of the rotor component, an enameled wire is wound inside the stator component, and a nameplate is attached to the bottom of the motor shell.
Furthermore, the side wall is provided with a large notch communicated with the opening end of the motor shell, and the enameled wire is led out of the motor shell from the large notch.
Furthermore, a plurality of small notches which are fixedly clamped with the cover plate are distributed on the side wall of the opening end of the motor shell along the circumferential direction.
Furthermore, a guide structure is arranged at the opening of the large notch, and the guide structure is suitable for guiding the stator assembly to be fixed with the motor shell.
Further, the guide structure is a fillet structure or a chamfer structure gradually expanding from the inner side wall of the large notch to the opening direction of the large notch.
The invention has the beneficial effects that:
(1) according to the shell assembly and the motor using the same, the raised step is arranged at the center of the bottom plate, the thickness t1 of the step is equal to the thickness t2 of the bottom plate, when the motor shaft is matched with the shaft hole, a chamfer transition area can be reserved between the lower surface of the step and the lower surface of the bottom plate, so that after the motor shaft is riveted with the motor shell, the effective contact length is increased, and the riveting fixing strength of the motor shaft and the motor shell is improved.
(2) According to the shell assembly and the motor using the same, the height difference h2 between the end face of the chamfer and the lower surface of the step on the motor shaft is greater than or equal to the radius r of the chamfer and less than or equal to the height difference h1 between the lower surface of the step and the lower surface of the bottom plate, so that the maximum effective contact length is realized after the motor shaft is riveted with the motor shell.
(3) According to the shell assembly and the motor using the shell assembly, the first annular decompression groove is formed in the connecting position of the bottom plate and the side wall, so that internal stress when the side wall is partially stretched is released, and the outward expansion deformation of the side wall is reduced; and meanwhile, a right-angle space is formed between the bottom plate and the side wall of the motor shell, so that the shell assembly and other parts of the motor can be conveniently matched and assembled in place.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is an exploded schematic view of a prior art electric machine;
FIG. 2 is a longitudinal center sectional schematic view of a prior art housing assembly;
FIG. 3 is an enlarged view at M of FIG. 2;
FIG. 4 is an exploded view of the housing assembly of the present invention;
FIG. 5 is a top view of the motor casing of the present invention;
FIG. 6 is a sectional view taken along line A-A of FIG. 5 after assembly of the motor housing with the motor shaft;
FIG. 7 is an enlarged view at P of FIG. 6;
FIG. 8 is a schematic view of the riveting principle of the motor shaft and the motor housing according to the present invention (the direction indicated by the arrow is the riveting direction);
FIG. 9 is a schematic view of a drawing process during the formation of a motor casing according to the present invention;
FIG. 10 is a schematic view of a shaping process in the motor casing forming process of the present invention;
fig. 11 is a schematic view of the guide structure at the large incision in the present invention.
In the figure, 1, a shell assembly, 101, a motor shell, 1011, a bottom plate, 10111, a step, 10112, a shaft hole, 10113, a pole claw, 10114, a pole claw hole, 1012, a side wall, 10121, a large notch, 10122, a small notch, 10123, a guide structure, 1013, a first annular pressure reduction groove, 1014, a first pressure reduction groove, 102, a motor shaft, 1021, a chamfer, 2, a stator assembly, 3, a rotor assembly, 4, an enameled wire, 5, an annular rivet head, 6, an annular rivet mark, 7, a plate material, 8a, a stretching female die, 8b, a stretching male die, 9, a transition fillet area, 10a shaping female die, 10b, a shaping male die, 11, a brand, 12 and an outlet box.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "lower" and "upper" refer to a position rearward of the pointing direction and a position forward of the pointing direction, respectively, in a direction pointing from the base plate toward the open end of the motor case.
The side wall 1012 extends upwards from one side of the bottom plate 1011, the side wall 1012 is an integrated annular structure, the cross-sectional shape of the side wall 1012 may be irregular as long as the stator assembly 2 and the rotor assembly 3 can be accommodated and can be engaged and fixed with the cover plate, for example, the side wall 1012 may extend upwards in a curved surface, or the cross-sectional profile of the side wall 1012 may be polygonal, as is preferable, in the specific implementation manner of this embodiment, the side wall 1012 is a cylindrical structure, the center of the shaft hole 10112 coincides with the center of the side wall 1012, the structural symmetry of the whole motor is ensured, and the stress on the motor shaft 102 is more uniform.
The structure of the motor shaft 102 is as shown in fig. 4, the motor shaft 102 is a solid cylindrical structure, a chamfer 1021 is formed by the round transition between the lower end surface of the motor shaft 102 and the circumferential side surface of the motor shaft 102, and the radius of the chamfer 1021 is r. The outer circle of the motor shaft 102 is matched with the shaft hole 10112 of the motor casing 101, generally in transition fit, the lower surface of the step 10111 in the circumferential direction of the shaft hole 10112 is extruded through the annular rivet head 5, and an annular rivet mark 6 is formed on the lower surface of the step 10111; the pressing force of the annular rivet head 5 against the step 10111 causes the shaft hole 10112 to contract and generates a clasping force on the outer circle of the motor shaft 102, so as to form the fixing strength of the motor shaft 102 and the motor casing 101, as shown in fig. 8. The magnitude of the fixation strength depends on: firstly, the extrusion force of the shaft hole 10112 to the outer circle of the motor shaft 102 is larger, the fixing strength is higher, and conversely, the fixing strength is smaller; second, the effective contact length L of the shaft hole 10112 with the outer circle of the motor shaft 102 is longer, the higher the fixing strength is, and conversely, the smaller the fixing strength is.
In the invention, the center of the bottom plate 1011 protrudes upwards, so that a height difference h1 is formed between the protruding step 10111 and the lower surface of the bottom plate 1011, the motor shaft 102 can pass through the step 10111 when being inserted into the shaft hole 10112, the chamfer 1021 of the motor shaft 102 moves towards the lower part of the step 10111, and the area of the chamfer 1021 in the shaft hole 10112 is reduced or even disappears, so that the effective contact length L between the shaft hole 10112 and the outer circle of the motor shaft 102 can be increased under the condition of the same wall thickness, and the fixing strength is improved. Since the motor housing 101 is made of a single plate, the thickness t1 of the step 10111 is equal to the thickness t2 of the bottom plate 1011, and it should be noted that, in the invention, the thickness t1 of the step 10111 is equal to the thickness t2 of the bottom plate 1011 as an ideal condition, and in an actual manufacturing process, the thickness t1 of the step 10111 may be slightly smaller than the thickness t2 of the bottom plate 1011 due to friction between molds.
The riveting height of the motor shaft 102 and the motor housing 101 is h2, i.e. the distance from the lower end surface of the motor shaft 102 to the lower surface of the step 10111; when h2 is larger than or equal to r, the effective contact length L between the shaft hole 10112 and the outer circle of the motor shaft 102 can be the maximum value, namely the wall thickness t1 at the step 10111. Therefore, in a further optimized embodiment, the height difference h1 between the lower surface of the step 10111 and the lower surface of the bottom plate 1011 is greater than or equal to the radius r of the chamfer 1021, so that the maximum effective contact length can be realized after the motor shaft 102 is riveted with the motor casing 101, and the riveting fixing strength of the motor shaft 102 and the motor casing 101 is improved.
In a more preferred embodiment, the height difference h1 between the lower surface of the step 10111 and the lower surface of the base plate 1011 is greater than or equal to the height difference h2 between the end surface of the motor shaft 102 on which the chamfer 1021 is provided and the lower surface of the step 10111. The end face of the motor shaft 102 can be ensured not to protrude out of the lower surface of the bottom plate 1011, and the surface of the nameplate 11 can be smooth after the bottom plate 1011 of the motor casing 101 is attached to the nameplate 11.
Preferably, a bottom plate 1011 located at the outer periphery of the step 10111 is provided with a pole claw 10113 extending toward the opening end of the motor housing 101, and a bottom plate 1011 located at one side of each pole claw 10113 is provided with a pole claw hole 10114. The pole claws 10113 are uniformly arranged around the circumferential direction and are turned upwards from the bottom plate 1011, the number of the pole claws 10113 is set according to actual requirements, pole claw holes 10114 are arranged in the embodiment shown in fig. 5, eight pole claws 10113 are arranged oppositely, and as shown in fig. 6, the pole claws 10113 are hump-shaped, and the peak tops of the pole claws 10113 are flattened. In the radial direction of the motor case 101, the step 10111 is located radially inside the pole claw 10113, and the pole claw hole 10114 is located radially outside the pole claw 10113.
In a preferred embodiment of the present invention, the pole claw 10113 is formed by punching and bending the material of the bottom plate 1011, and the bent bottom plate 1011 forms the pole claw hole 10114, so as to ensure that a closed chamber is formed inside the pole claw 10113, thereby preventing the entry of foreign matters and causing the poor locking of the motor.
Example 2, on the basis of example 1, the bottom plate 1011 has a first annular pressure-reducing groove 1013 at the junction with the side wall 1012. As shown in FIGS. 6 and 10, the first annular pressure relief trough 1013 is located at the root of the sidewall 1012, conforms to the inner wall of the sidewall 1012, and the cross-section of the first annular pressure relief trough 1013 is approximately rectangular. The principle of the design is as follows: the sheet material 7 forms a side wall 1012 through a stretching process and a shaping process, the stretching process is realized by a stretching die and comprises a stretching female die 8a and a stretching male die 8b, in order to prevent the stretching process, the side wall 1012 generates a stretching tearing phenomenon, a male die fillet transition area is arranged at the front end of the stretching male die 8b, and a transition fillet area 9 is formed at the root of the side wall 1012. The transition fillet area 9 has certain internal stress, and the transition fillet area 9 can influence the matching of motor parts, so the transition fillet area 9 of the motor shell 101 is shaped by the shaping female die 10a and the shaping male die 10b to form a first annular pressure reduction groove 1013, which can eliminate partial internal stress at the transition fillet area 9, reduce the outward expansion deformation of the side wall 1012 caused by the internal stress, and also can form a right-angle space between the side wall 1012 and the bottom plate 1011 of the motor shell 101, as shown in fig. 9 and 10.
In embodiment 3, in addition to embodiment 1 or embodiment 2, a first pressure relief groove 1014 is provided at a connection point between the bottom plate 1011 and the pole claw 10113. As shown in fig. 6, the first pressure-reducing groove 1014 is similar in structure and functions to the first annular pressure-reducing groove 1013, and differs from the first annular pressure-reducing groove 1013 in that the first pressure-reducing groove 1014 is a plurality of arc-shaped grooves corresponding to the number of the pole claws 10113.
The principle of providing the first pressure relief groove 1014 is: the motor casing 101 is made of free-cutting steel, and the bending part of the pole claw 10113 has certain internal stress and certain elasticity, so that certain resilience exists after punching and bending, and the perpendicularity of the pole claw 10113 and the bottom plate 1011 cannot be guaranteed; therefore, along the root of the pole claw 10113, the first pressure reducing groove 1014 is arranged on the bottom plate 1011, so that the internal stress at the bending part of a part of the pole claw 10113 is eliminated, the resilience of the pole claw 10113 is reduced, and the perpendicularity of the pole claw 10113 is ensured, as shown in fig. 6.
Embodiment 4, a motor includes a cover plate, a stator assembly 2, a rotor assembly, and the housing assembly 1, where the cover plate covers an opening end of a motor casing 101, a structure of the motor is similar to that of the motor in the prior art in fig. 1, and only the motor casing structure in the prior art needs to be changed into the motor casing 101 structure in the present invention, in addition, the cover plate structure is not illustrated in fig. 1, a person skilled in the art can know the structure and the installation method of the cover plate according to the prior art, where the rotor assembly 3 and the stator assembly 2 are both located in the motor casing 101, the rotor assembly 3 is sleeved on a motor shaft 102, the stator assembly 2 is sleeved on the periphery of the rotor assembly 3, an enameled wire is wound inside the stator assembly 2, and a nameplate 11 is attached to the bottom of the motor casing 101.
Preferably, the side wall 1012 has a large cutout 10121 communicating with the open end of the motor case 101, and the enamel wire is led out of the motor case 101 from the large cutout 10121. The large cutout 10121 is primarily used to mount the outlet box 12.
In order to facilitate the installation of the motor casing 101 and the cover plate, a plurality of small notches 10122 fastened and fixed with the cover plate are distributed on the side wall 1012 at the opening end of the motor casing 101 along the circumferential direction. As shown in fig. 6, the end face of the motor casing 101 is formed into a tooth-shaped structure by the arrangement of a plurality of small notches 10122, so that the motor casing can be clamped and positioned with the cover plate.
The guide 10123 may be a rounded structure or a chamfered structure gradually expanding from the inner side wall 1012 of the large cutout 10121 toward the opening of the large cutout 10121. In the embodiment shown in fig. 11, the guide structure 10123 is an inclined straight chamfer structure with an angle n gradually inclined from bottom to top toward both sides in the upper end region near the large notch 10121.
In the description of the present invention, it is to be understood that the terms "inner", "outer", "axial", "radial", "circumferential", and the like, as used herein, refer to an orientation or positional relationship as shown in the drawings, which is for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, is not to be construed as limiting the present invention.
Furthermore, the terms "first" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
In this specification, the schematic representations of the terms are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (11)
1. The utility model provides a housing assembly, includes motor casing (101) and motor shaft (102), motor casing (101) are by bottom plate (1011) and encircle lateral wall (1012) that bottom plate (1011) set up constitute one end open-ended tubbiness structure, the one end of motor shaft (102) is equipped with chamfer (1021), its characterized in that:
the center of the bottom plate (1011) protrudes towards the opening end of the motor casing (101) to form a step (10111), the center of the step (10111) is provided with a shaft hole (10112), and one end of the motor shaft (102) provided with a chamfer (1021) is suitable for being inserted into the shaft hole (10112);
the thickness t1 of the step (10111) is equal to the thickness t2 of the bottom plate (1011); the height difference h2 between the end face of the motor shaft (102) provided with the chamfer (1021) and the lower surface of the step (10111) is larger than or equal to the radius r of the chamfer (1021);
the height difference h1 between the lower surface of the step (10111) and the lower surface of the bottom plate (1011) is greater than or equal to the height difference h2 between the end surface of the motor shaft (102) provided with the chamfer (1021) and the lower surface of the step (10111).
2. The housing assembly of claim 1, wherein: the base plate (1011) on the periphery of the step (10111) is provided with polar claws (10113) extending towards the opening end direction of the motor casing (101), and the base plate (1011) on one side of each polar claw (10113) is provided with a polar claw hole (10114).
3. The housing assembly of claim 1, wherein: the floor (1011) has a first annular pressure relief groove (1013) at the junction with the side wall (1012).
4. The housing assembly of claim 2, wherein: the pole claw (10113) is formed by punching and bending the material of the bottom plate (1011).
5. The housing assembly of claim 4, wherein: and a first pressure reduction groove (1014) is formed in the joint of the bottom plate (1011) and the pole claw (10113).
6. The housing assembly of claim 1, wherein: the side wall (1012) is of a cylindrical structure, and the center of the shaft hole (10112) coincides with the circle center of the side wall (1012).
7. An electric machine characterized by: the motor comprises a cover plate, a stator assembly (2), a rotor assembly and the shell assembly (1) as claimed in any one of claims 1 to 6, wherein the cover plate covers the open end of the motor shell (101), the rotor assembly (3) and the stator assembly (2) are both positioned in the motor shell (101), the rotor assembly (3) is sleeved on the motor shaft (102), the stator assembly (2) is sleeved on the periphery of the rotor assembly (3), an enameled wire is wound inside the stator assembly (2), and a nameplate (11) is attached to the bottom of the motor shell (101).
8. The electric machine of claim 7, wherein: the side wall (1012) is provided with a large notch (10121) communicated with the opening end of the motor casing (101), and the enameled wire is led out of the motor casing (101) from the large notch (10121).
9. The electric machine of claim 7, wherein: a plurality of small notches (10122) which are fixedly clamped with the cover plate are distributed on the side wall (1012) at the opening end of the motor shell (101) along the circumferential direction.
10. The electric machine of claim 8, wherein: the opening of big incision (10121) is provided with guide structure (10123), guide structure (10123) are suitable for the guide stator module (2) and motor casing (101) fixed.
11. The electric machine of claim 10, wherein: the guide structure (10123) is a round angle structure or a chamfer structure gradually expanded from the inner side wall of the large notch (10121) to the opening direction of the large notch (10121).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011457849.3A CN112531954B (en) | 2020-12-11 | 2020-12-11 | Shell assembly and motor using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011457849.3A CN112531954B (en) | 2020-12-11 | 2020-12-11 | Shell assembly and motor using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112531954A CN112531954A (en) | 2021-03-19 |
| CN112531954B true CN112531954B (en) | 2022-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011457849.3A Active CN112531954B (en) | 2020-12-11 | 2020-12-11 | Shell assembly and motor using same |
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| Country | Link |
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| CN (1) | CN112531954B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203800725U (en) * | 2014-04-04 | 2014-08-27 | 日本电产株式会社 | Motor |
| CN105322692A (en) * | 2015-05-12 | 2016-02-10 | 常州工利精机科技有限公司 | Motor housing and forming method therefor |
| CN208522575U (en) * | 2018-05-23 | 2019-02-19 | 深圳市泓之发机电有限公司 | A kind of motor rear cover structure and motor |
| CN209349378U (en) * | 2018-12-24 | 2019-09-06 | 常州工利精机科技有限公司 | It is a kind of for manufacturing the deep-draw deep-draw progressive die of electric motor of automobile casing |
| CN211958919U (en) * | 2020-04-28 | 2020-11-17 | 江苏雷利电机股份有限公司 | Shell assembly and motor using same |
-
2020
- 2020-12-11 CN CN202011457849.3A patent/CN112531954B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203800725U (en) * | 2014-04-04 | 2014-08-27 | 日本电产株式会社 | Motor |
| CN105322692A (en) * | 2015-05-12 | 2016-02-10 | 常州工利精机科技有限公司 | Motor housing and forming method therefor |
| CN208522575U (en) * | 2018-05-23 | 2019-02-19 | 深圳市泓之发机电有限公司 | A kind of motor rear cover structure and motor |
| CN209349378U (en) * | 2018-12-24 | 2019-09-06 | 常州工利精机科技有限公司 | It is a kind of for manufacturing the deep-draw deep-draw progressive die of electric motor of automobile casing |
| CN211958919U (en) * | 2020-04-28 | 2020-11-17 | 江苏雷利电机股份有限公司 | Shell assembly and motor using same |
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| Publication number | Publication date |
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| CN112531954A (en) | 2021-03-19 |
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