CN111042491B - Material spraying device and feeding system - Google Patents
Material spraying device and feeding system Download PDFInfo
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- CN111042491B CN111042491B CN201911170903.3A CN201911170903A CN111042491B CN 111042491 B CN111042491 B CN 111042491B CN 201911170903 A CN201911170903 A CN 201911170903A CN 111042491 B CN111042491 B CN 111042491B
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- feeding
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F21/00—Implements for finishing work on buildings
- E04F21/02—Implements for finishing work on buildings for applying plasticised masses to surfaces, e.g. plastering walls
- E04F21/06—Implements for applying plaster, insulating material, or the like
- E04F21/08—Mechanical implements
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Abstract
The invention discloses a material spraying device and a material feeding system, wherein the material spraying device comprises a material feeding assembly, the material feeding assembly comprises a material feeding shaft and an installation sleeve, the material feeding shaft is provided with a material feeding cavity, a material feeding hole and a material discharging hole, the installation sleeve is provided with a material receiving hole, the installation sleeve is sleeved on the outer side of the material feeding shaft, so that the material receiving hole corresponds to the material feeding hole, and the material feeding shaft can rotate relative to the installation sleeve; and the spraying component comprises a feeding pipe and a scraping plate, the first end of the feeding pipe is connected with the feeding shaft through a discharging port at an included angle, the second end of the feeding pipe is connected with the scraping plate, the scraping plate is provided with a spraying port, and the spraying port is communicated with the pipe cavity of the feeding pipe. The material spraying pipe and the feeding shaft are arranged at an included angle, so that the position of a material spraying port of the scraping plate relative to the material outlet is far away, and therefore, the centrifugal force of the material spraying pipe is also increasingly large along with the distance between the material and the material outlet in the rotating process of the feeding shaft, so that the scraping plate can be sprayed or thrown out by a large acting force, the air holes and other conditions are avoided, and the construction quality is guaranteed.
Description
Technical Field
The invention relates to the technical field of construction machinery engineering, in particular to a material spraying device and a material feeding system.
Background
The wall plastering refers to the construction process of plastering cement mortar, mixed mortar, lime mortar and the like on the wall. The plastering work of the indoor and outdoor wall is the work carried out after the construction of the building structure is finished, and the plastering of the wall can play the roles of moisture prevention, weathering prevention, heat insulation and the like so as to prevent the building wall from being eroded by wind, rain, snow and the like.
Wall plastering is usually performed by filling and scraping mortar/cement or the like into a wall surface. However, after plastering, mortar or cement is prone to generate small pores, and construction quality cannot be guaranteed.
Disclosure of Invention
Based on this, it is necessary to provide a material spraying device and a material feeding system; the material spraying device sprays materials by using centrifugal force, so that the construction quality is ensured; the feeding system comprises the material spraying device.
The technical scheme is as follows:
on one hand, the material spraying device comprises a feeding component, wherein the feeding component comprises a feeding shaft and an installation sleeve, the feeding shaft is provided with a feeding cavity, a feeding hole and a discharging hole, the feeding hole and the discharging hole are arranged at the side part of the feeding shaft at intervals, the feeding hole and the discharging hole are both communicated with the feeding cavity, the installation sleeve is fixedly arranged and is provided with a material receiving hole, the installation sleeve is sleeved on the outer side of the feeding shaft, so that the material receiving hole corresponds to the feeding hole, and the feeding shaft can rotate relative to the installation sleeve; and the spraying component comprises a feeding pipe and a scraping plate, the first end of the feeding pipe is connected with the feeding shaft through a discharging port at an included angle, the second end of the feeding pipe is connected with the scraping plate, the scraping plate is provided with a spraying port, and the spraying port is communicated with the pipe cavity of the feeding pipe.
In the material spraying device, the material receiving opening receives materials sent from the outside, the materials enter the feeding cavity of the feeding shaft through the material inlet, the feeding shaft rotates, the materials can be thrown out of the material outlet and reach the scraping plate through the feeding pipe, and the materials are sprayed to the surfaces of a wall and the like through the material spraying opening of the scraping plate; the material spraying pipe and the feeding shaft are arranged at an included angle, so that the position of a material spraying port of the scraping plate relative to the material outlet is far away, and therefore, the centrifugal force of the material spraying pipe is also increasingly large along with the distance between the material and the material outlet in the rotating process of the feeding shaft, so that the scraping plate can be sprayed or thrown out by a large acting force, the air holes and other conditions are avoided, and the construction quality is guaranteed.
The technical solution is further explained below:
in one embodiment, the cross-sectional area of the lumen of the feeding tube is gradually increased from the first end to the second end.
In one embodiment, at least two discharge ports are arranged, the discharge ports are arranged at intervals and are arranged on the periphery of the feeding shaft in a surrounding mode, at least two feeding pipes are arranged and correspond to the discharge ports, and at least two scraping plates are arranged and correspond to the feeding pipes.
In one embodiment, at least two feeding holes are arranged, and the feeding holes are arranged at intervals and are arranged around the periphery of the feeding shaft.
In one embodiment, the angle between the feed tube and the feed axis is 45-70 °.
In one embodiment, the feeding assembly further comprises a mounting bearing, an outer ring of the mounting bearing is sleeved on the inner wall of the mounting sleeve, and an inner ring of the mounting bearing is sleeved on the outer wall of the feeding shaft.
In one embodiment, the feeding assembly further comprises a spacing ring, the spacing ring is sleeved on the outer wall of the feeding shaft, at least two mounting bearings are arranged, and the spacing ring is arranged between every two adjacent mounting bearings.
In one embodiment, the inner wall of the mounting sleeve is provided with a limiting step, and the limiting step is used for limiting the mounting of the mounting bearing.
In one embodiment, the feeding assembly further comprises an end cover, the end cover is arranged at one end of the mounting sleeve, and the end cover is provided with a through hole for the feeding shaft to pass through;
the material spraying device further comprises a driving assembly, and the driving assembly is in transmission connection with the feeding shaft and is used for driving the feeding shaft to rotate.
On the other hand, a feeding system is also provided, which comprises the material spraying device according to any one of the above technical schemes.
The feeding system comprises the material spraying device, and construction quality can be improved.
Drawings
FIG. 1 is a schematic view of the overall structure of a material spraying device in the embodiment;
FIG. 2 is an exploded view of the material injection device of the embodiment of FIG. 1;
FIG. 3 is a sectional structure view of the material spraying device in the embodiment of FIG. 1;
FIG. 4 is a mounting structure view of the feeding shaft in the embodiment of FIG. 1;
FIG. 5 is a schematic structural view of the mounting sleeve in the embodiment of FIG. 1;
FIG. 6 is a front view of the material injection assembly of the embodiment of FIG. 1;
fig. 7 is a back view of the material spraying assembly of the embodiment of fig. 1.
Reference is made to the accompanying drawings in which:
110. a feed shaft; 111. a feeding cavity; 112. a feed inlet; 113. a discharge port; 120. installing a sleeve; 121. a material receiving port; 122. a limiting step; 130. mounting a bearing; 140. a spacer ring; 150. an end cap; 210. a feed pipe; 220. scraping the plate; 221. and (4) a material spraying opening.
Detailed Description
Embodiments of the present invention are described in detail below with reference to the accompanying drawings:
it will be understood that when an element is referred to herein as being "secured" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 3, a material spraying device includes a feeding assembly, the feeding assembly includes a feeding shaft 110 and an installation sleeve 120, the feeding shaft 110 is provided with a feeding cavity 111, a feeding port 112 and a discharging port 113, the feeding port 112 and the discharging port 113 are arranged at the side of the feeding shaft 110 at intervals, the feeding port 112 and the discharging port 113 are both communicated with the feeding cavity 111, the installation sleeve 120 is fixedly arranged and provided with a receiving port 121, the installation sleeve 120 is sleeved outside the feeding shaft 110 to enable the receiving port 121 to correspond to the feeding port 112, and the feeding shaft 110 can rotate relative to the installation sleeve 120; and the spraying component comprises a feeding pipe 210 and a scraping plate 220, the first end of the feeding pipe 210 is connected with the feeding shaft 110 through a discharging hole 113 at an included angle, the second end of the feeding pipe 210 is connected with the scraping plate 220, the scraping plate 220 is provided with a spraying hole 221, and the spraying hole 221 is communicated with the pipe cavity of the feeding pipe 210.
In the material spraying device, the material receiving opening 121 receives materials sent from the outside, the materials enter the feeding cavity 111 of the feeding shaft 110 through the material inlet 112, the feeding shaft 110 rotates, the materials can be thrown out of the material outlet 113 and reach the scraping plate 220 through the feeding pipe 210, and the materials are sprayed to the surfaces of a wall and the like through the material spraying opening 221 of the scraping plate 220; the material spraying pipe and the feeding shaft 110 are arranged at an included angle, so that the material spraying port 221 of the scraping plate 220 is far away from the discharge port 113, and therefore, the centrifugal force of the material spraying pipe is larger and larger along with the distance from the discharge port 113 to the feeding shaft 110 in the rotating process, so that the scraping plate 220 can be sprayed or thrown out by larger acting force, the air holes and other conditions are avoided, and the construction quality is guaranteed.
As shown in fig. 1 to 3, the feeding shaft 110 may be driven by an external driving component, such as a motor, to rotate, the feeding shaft 110 is provided with a feeding cavity 111, and the feeding cavity 111 is a closed cavity arranged in the feeding shaft 110, and may be formed along the length direction of the feeding shaft 110 as shown in fig. 3; the side of the feeding shaft 110 is further provided with a feeding port 112 and a discharging port 113, the feeding port 112 and the discharging port 113 can be arranged at intervals along the length direction of the feeding shaft 110, the feeding port 112 and the discharging port 113 are also communicated with the feeding cavity 111 to realize feeding and discharging, as shown in fig. 3, the feeding port 112 is arranged at a position close to the right end of the feeding cavity 111, and the discharging port 113 is arranged at a position close to the left end of the feeding cavity 111.
As shown in fig. 1 to 3, the mounting sleeve 120 is of a sleeve structure and is sleeved outside the feeding shaft 110, and the feeding shaft 110 can rotate relative to the mounting sleeve 120, so that the mounting sleeve 120 plays a role in mounting and supporting the feeding shaft 110, and a person skilled in the art can complete the specific mounting arrangement as required; the material receiving port 121 on the mounting sleeve 120 corresponds to the position of the material inlet 112, and the material receiving port 121 on the mounting sleeve 120 is used for being butted with an external conveying pipeline so as to receive conveyed materials.
During operation, the material is conveyed by the conveying pipeline and enters the material receiving opening 121 of the mounting sleeve 120, the feeding shaft 110 is in a rotating state, and when the feeding opening 112 of the feeding shaft 110 corresponds to the material receiving opening 121 of the mounting sleeve 120, the material can enter the feeding cavity 111 through the feeding opening 112. Because the feeding shaft 110 rotates, the material entering the feeding cavity 111 gradually reaches the position of the discharge port 113 and is thrown out through the discharge port 113, so that the material enters the feeding pipe 210; as shown in fig. 1 and 3, because be the contained angle setting between conveying pipe 210 and the pay-off axle 110, and conveying pipe 210 rotates along with pay-off axle 110, therefore, the in-process of material ejection of compact in conveying pipe 210, the distance of material and pay-off axle 110 also grow gradually, because of the rotation effect, the centrifugal force that the material received is also bigger and bigger, thereby can throw away fast through the nozzle 221 of scraping flat plate 220, play the technical effect of pump sending, because throw away fast, the problem such as bubble has been avoided producing, scraping flat plate 220 is at the pivoted in-process, will throw away the material on the wall surface and smooth, accomplish the operation that the wall plastered.
It should be noted that the feeding tube 210 and the scraping plate 220 may adopt other existing structures to satisfy the functions of feeding and material-spraying leveling, and are not described again.
Referring to fig. 1 to 3, 6 and 7, the cross-sectional area of the lumen of the feeding tube 210 gradually increases from the first end to the second end.
As shown in fig. 3, the size of the lumen of the feeding tube 210 is gradually increased from the feeding side to the discharging side, so that after the material enters the feeding tube 210, the radius of the discharging port 113 relative to the feeding shaft 110 is gradually increased, and therefore, the pressure drop generated during the discharging process is gradually reduced, and the material can be easily discharged from the lumen of the feeding tube 210 by centrifugal force; meanwhile, as the material is farther away from the rotation center of the feeding shaft 110 in the discharging process, the centrifugal acting force is larger and larger, which is equivalent to the effect of secondary pumping, the double pumping has better conveying effect, and the material is easier to pump to the scraping plate 220; in addition, as the cross-sectional area of the tube cavity of the feeding tube 210 is gradually increased, the material can be rapidly pumped out from the feeding tube 210, so that the pressure in the feeding tube 210 is smaller than the pressure in the feeding cavity 111 of the feeding shaft 110, and the material in the feeding cavity 111 can be rapidly discharged into the feeding tube 210 by the pressure difference, thereby accelerating the entry and discharge of the material, which is not described herein again.
It should be noted that the cross section of the feeding tube 210 may be rectangular, kidney-shaped, or oval, and any structure that can be configured as a long and narrow gradual change channel may be adopted, and will not be described herein again.
Referring to fig. 1 to 3, at least two discharge ports 113 are provided, the discharge ports 113 are spaced apart from each other and are disposed around the periphery of the feeding shaft 110, at least two feeding pipes 210 are provided and are disposed corresponding to the discharge ports 113, and at least two scraping plates 220 are provided and are disposed corresponding to the feeding pipes 210.
Specifically, in the embodiment shown in fig. 1 and 2, four discharge ports 113 are provided and uniformly distributed on the periphery of the feeding shaft 110, four feeding pipes 210 and four scraping plates 220 are correspondingly provided, and the working efficiency is improved by the cooperative action of the plurality of scraping plates 220; of course, according to the actual working condition, the scraping plates 220 may also be provided with three or five, etc., and the feeding pipe 210 and the discharge port 113 are correspondingly provided, which will not be described herein.
Referring to fig. 1 to 3, at least two feeding holes 112 are provided, and the feeding holes 112 are spaced apart and arranged around the feeding shaft 110.
For quick feeding, satisfy the operation of plastering, improve operating efficiency, can set up feed inlet 112 such as three, four as required to quick feeding increases the frequency of feeding, no longer explains repeatedly.
Referring to fig. 3 and 4, the feeding shaft 110 may be arranged in sections, for example, the feeding shaft 110 may include an installation section, a feeding section and a discharging section, the installation section is used for being installed in cooperation with the installation sleeve 120, the feeding port 112 is arranged in the feeding section and corresponds to the receiving port 121 on the installation sleeve 120 after installation so as to be capable of being butted when rotating, and the discharging port 113 is arranged in the discharging section so as to be butted with the feeding pipe 210. As shown in fig. 4, the radius of the feeding section may be smaller than that of the feeding section, and the radius of the installation section may also be smaller than that of the feeding section, which is not described again.
In one embodiment, the angle between the feed tube 210 and the feed axis 110 is 45-70.
The feeding pipe 210 and the feeding shaft 110 are arranged in an included angle, so that the scraping plate 220 at the tail end of the feeding pipe 210 can have a longer distance relative to the rotation center of the feeding shaft 110, therefore, the included angle can be in a range of 45-70 degrees, not only is the occupied space of the spraying device saved, but also the distance requirement can be met, and a better centrifugal conveying technical effect is obtained, which is not described again.
Referring to fig. 2 to 4, the feeding assembly further includes a mounting bearing 130, an outer ring of the mounting bearing 130 is sleeved on an inner wall of the mounting sleeve 120, and an inner ring of the mounting bearing 130 is sleeved on an outer wall of the feeding shaft 110.
The mounting bearing 130 is used for supporting and mounting the feeding shaft 110, so as to realize the function that the feeding shaft 110 can be supported and mounted on the mounting sleeve 120 and can rotate relative to the mounting sleeve 120.
Referring to fig. 2 to 4, the feeding assembly further includes a spacer ring 140, the spacer ring 140 is sleeved on the outer wall of the feeding shaft 110, at least two mounting bearings 130 are provided, and the spacer ring 140 is provided between adjacent mounting bearings 130.
When the mounting bearings 130 are provided with at least two, in order to prevent the adjacent mounting bearings 130 from moving, the spacing ring 140 is provided to press the corresponding mounting bearings 130 through both ends of the spacing ring 140, thereby realizing the spacing limitation of the mounting bearings 130.
Referring to fig. 3 and 5, the inner wall of the mounting sleeve 120 is provided with a limiting step 122, and the limiting step 122 is used for limiting the mounting of the mounting bearing 130.
If the mounting bearing 130 moves relative to the mounting sleeve 120 during the operation, the feeding shaft 110 may be driven to move, so that the feeding port 112 on the feeding shaft 110 cannot correspond to the receiving port 121 on the mounting sleeve 120, and the discharging port 113 on the feeding shaft 110 is in butt joint with the feeding pipe 210. Therefore, the limiting step 122 is arranged on the inner wall of the mounting sleeve 120, as shown in fig. 3, two mounting bearings 130 can be arranged, the left end of the left mounting bearing 130 is pressed against the limiting step 122, and a spacing ring 140 is arranged between the left mounting bearing 130 and the right mounting bearing 130, so as to avoid a series of problems caused by the movement of the mounting bearing 130 towards the left.
Referring to fig. 3, the feeding assembly further includes an end cap 150, the end cap 150 is disposed at one end of the mounting sleeve 120, and the end cap 150 is provided with a through hole for the feeding shaft 110 to pass through.
As shown in fig. 3, the end cap 150 is used for closing or covering the installation portion such as the installation bearing 130, and the end cap 150 may be fixed at the right end of the installation sleeve 120 by bolts, or may be fixed by screwing with the right end of the installation sleeve 120, so that the installation bearing 130 is limited between the end cap 150 on the right side and the limit step 122 on the left side, thereby ensuring the installation accuracy on one hand and the structural reliability on the other hand.
In one embodiment, the material spraying device further comprises a driving component, and the driving component is in transmission connection with the feeding shaft 110 and is used for driving the feeding shaft 110 to rotate.
The driving component may be a driving motor, etc. to directly or indirectly drive the feeding shaft 110 to rotate, which is not described in detail.
The embodiment also provides a feeding system, which comprises the material spraying device in any one of the above embodiments.
The feeding system comprises the material spraying device, and construction quality can be improved.
The feeding system comprises a conveying pipeline, the conveying pipeline is butted with the mounting sleeve 120 of the material spraying device to convey the material to the feeding cavity 111 of the feeding shaft 110 through the material receiving opening 121 of the mounting sleeve 120, and details are omitted.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A material spraying device is characterized by comprising:
the feeding assembly comprises a feeding shaft and an installation sleeve, the feeding shaft is provided with a feeding cavity, a feeding port and a discharging port, the feeding port and the discharging port are arranged at the side part of the feeding shaft at intervals, the feeding port and the discharging port are both communicated with the feeding cavity, the installation sleeve is fixedly arranged and is provided with a receiving port, the installation sleeve is sleeved on the outer side of the feeding shaft so that the receiving port corresponds to the feeding port, and the feeding shaft can rotate relative to the installation sleeve; and
the spraying assembly comprises a feeding pipe and a scraping plate, the first end of the feeding pipe is connected with the feeding shaft in an included angle mode through the discharging port, the second end of the feeding pipe is connected with the scraping plate, the scraping plate is provided with a spraying port, and the spraying port is communicated with the pipe cavity of the feeding pipe.
2. The material spraying device of claim 1, wherein the cross-sectional area of the lumen of the feed tube increases from the first end to the second end.
3. The material spraying device according to claim 1, wherein at least two material outlets are provided, the material outlets are arranged at intervals and around the periphery of the feeding shaft, at least two material feeding pipes are provided and are arranged corresponding to the material outlets, and at least two scraping plates are provided and are arranged corresponding to the material feeding pipes.
4. The material spraying device of claim 1, wherein at least two material inlets are arranged, and the material inlets are arranged at intervals and are arranged around the periphery of the feeding shaft.
5. The material spraying device of claim 1, wherein the angle between the feed tube and the feed axis is 45-70 °.
6. The spraying device of any one of claims 1 to 5, wherein the feeding assembly further comprises a mounting bearing, an outer ring of the mounting bearing is sleeved on an inner wall of the mounting sleeve, and an inner ring of the mounting bearing is sleeved on an outer wall of the feeding shaft.
7. The spraying device of claim 6, wherein the feeding assembly further comprises a spacer ring, the spacer ring is sleeved on the outer wall of the feeding shaft, at least two mounting bearings are provided, and the spacer ring is provided between the adjacent mounting bearings.
8. The spraying device of claim 6, wherein the inner wall of the mounting sleeve is provided with a limiting step, and the limiting step is used for limiting the mounting of the mounting bearing.
9. The spraying device of claim 6, wherein the feeding assembly further comprises an end cap, the end cap is arranged at one end of the mounting sleeve, and the end cap is provided with a through hole for the feeding shaft to pass through;
the material spraying device further comprises a driving assembly, and the driving assembly is in transmission connection with the feeding shaft and is used for driving the feeding shaft to rotate.
10. A feeding system comprising a spraying device according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911170903.3A CN111042491B (en) | 2019-11-26 | 2019-11-26 | Material spraying device and feeding system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911170903.3A CN111042491B (en) | 2019-11-26 | 2019-11-26 | Material spraying device and feeding system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111042491A CN111042491A (en) | 2020-04-21 |
| CN111042491B true CN111042491B (en) | 2021-04-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911170903.3A Active CN111042491B (en) | 2019-11-26 | 2019-11-26 | Material spraying device and feeding system |
Country Status (1)
| Country | Link |
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| CN (1) | CN111042491B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004081935A (en) * | 2002-08-23 | 2004-03-18 | Abb Kk | Rotary spray head |
| JP2009125634A (en) * | 2007-11-21 | 2009-06-11 | Fuji Xerox Co Ltd | Solvent removal apparatus |
| CN103341421A (en) * | 2012-04-05 | 2013-10-09 | 无锡西神日化用品研究所 | Material spraying device |
| CN103464318A (en) * | 2013-09-26 | 2013-12-25 | 无锡美灵数码科技有限公司 | Fine spray nozzle |
-
2019
- 2019-11-26 CN CN201911170903.3A patent/CN111042491B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004081935A (en) * | 2002-08-23 | 2004-03-18 | Abb Kk | Rotary spray head |
| JP2009125634A (en) * | 2007-11-21 | 2009-06-11 | Fuji Xerox Co Ltd | Solvent removal apparatus |
| CN103341421A (en) * | 2012-04-05 | 2013-10-09 | 无锡西神日化用品研究所 | Material spraying device |
| CN103464318A (en) * | 2013-09-26 | 2013-12-25 | 无锡美灵数码科技有限公司 | Fine spray nozzle |
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| Publication number | Publication date |
|---|---|
| CN111042491A (en) | 2020-04-21 |
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