CN109866501B - Screen printing machine with mask unit capable of printing different patterns - Google Patents
Screen printing machine with mask unit capable of printing different patterns Download PDFInfo
- Publication number
- CN109866501B CN109866501B CN201811325227.8A CN201811325227A CN109866501B CN 109866501 B CN109866501 B CN 109866501B CN 201811325227 A CN201811325227 A CN 201811325227A CN 109866501 B CN109866501 B CN 109866501B
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- Prior art keywords
- mask
- unit
- printed circuit
- screen printing
- metal mask
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/34—Screens, Frames; Holders therefor
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
- H05K3/12—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns
- H05K3/1216—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns by screen printing or stencil printing
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Screen Printers (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
- Manufacturing Of Printed Wiring (AREA)
Abstract
The present invention relates to a screen printer equipped with mask units capable of printing different patterns, and more particularly, to a screen printer equipped with mask units capable of printing different patterns, which can print printed circuit boards having different printed patterns using the same apparatus and perform screen printing by a relative movement of the mask units to a position where a transfer unit is located. The present invention as described above is technically characterized in that, in a printed circuit board screen printer including a main body, a shuttle unit, a view unit, and a transfer unit, screen printing can be performed by sequentially supplying printed circuit boards having different print patterns.
Description
Technical Field
The present invention relates to a Screen printer (Screen printer with masking unit that is coated with print differential pattern) equipped with mask units that can print different patterns, and more particularly, to a Screen printer equipped with mask units that can print different patterns by printing printed circuit boards with different printed patterns using the same device and realizing Screen printing by the dependent movement of the mask units transferred to a printing area.
Background
In general, Surface Mount Technology (SMT) refers to a technology for mounting and hardening components such as semiconductors, diodes, or chips on an upper portion of a Printed Circuit Board (PCB) using various devices, and a Screen printer (Screen printing) is used in order to perform a Screen printing process for coating solder paste (Cream solder) on the upper portion of the Printed circuit board using a double metal mask.
An apparatus for applying solder paste to a printed circuit board by a screen printer is known, and most typically, a configuration in which the supply and discharge are made in a pipeline by a conveyor system.
The existing metal mask is formed by punching injection holes corresponding to the printed circuits of 1 printed circuit board on 1 metal mask, and when the screen printing of the printed circuit board with different printing patterns is required, the metal mask corresponding to the requirement needs to be replaced and used.
Therefore, in order to perform screen printing on a plurality of printed circuit boards having different print patterns, it is necessary to provide a plurality of metal masks corresponding to the print patterns of the printed circuit boards. This causes an initial manufacturing cost of the metal mask and an increase in required storage space and a trouble in management.
Further, sequential operations can be performed only on the same type of printed circuit board, and in order to perform screen printing on printed circuit boards having different print patterns, it takes time to replace the metal mask, which causes a problem of a decrease in productivity.
In general, in order to solve the above-described conventional problems, a double rail structure in which 2 apparatuses are attached to each other in opposite directions is applicable, but this causes an increase in initial investment cost, unnecessary maintenance and management costs, and an excessive installation space of the apparatuses due to the double rail structure.
Further, the conventional screen printer fixes the metal mask at the center and performs the screen printing work by moving the printed circuit board introduced from the shuttle unit to the position of the metal mask at the center, and the printed circuit board may be displaced or separated due to shaking caused by the movement and thus further cause a problem of lowering the overall printing quality.
Documents of the prior art
Patent document
(patent document 1) KR10-2011-
(patent document 2) KR 10-1226762B 1
Disclosure of Invention
An object of the present invention is to solve the above-described conventional problems and to provide a screen printer including a mask unit capable of transferring a metal mask having a plurality of patterns formed by through holes, and capable of transferring a pattern to be printed to a mask unit capable of printing different patterns in a printing area where screen printing work can be performed.
The object of the present invention is not limited to the above-described object, and other objects not mentioned can be further clarified by the following description.
In order to achieve the above object, the present invention is characterized in that: in a printed circuit board screen printer composed of a main body, a shuttle unit, a view unit and a transfer unit, screen printing can be performed by sequentially supplying printed circuit boards having different printing patterns,
the above shuttle unit, comprising: a side substrate in a flat plate shape and mounted side by side in a moving direction of the printed circuit board; a conveyor mounted on an inner surface of the side substrate; a shuttle unit ball screw mounted so as to penetrate the side substrate; a shuttle unit guide block fixedly mounted on an inner surface of the side substrate and moving the side substrate in accordance with rotation of the shuttle unit ball screw; and a shuttle unit guide bar installed at a lower portion of the side substrate and formed long in a direction perpendicular to a moving direction of the printed circuit board to guide the movement of the side substrate in the side direction;
the mask unit includes: a metal mask part for perforating different printing patterns; a mask unit guide part for transferring the metal mask along a direction perpendicular to a moving direction of the printed circuit board in order to move the metal mask to a screen printing operation position; and a fixing part for pressing the metal mask on the upper part in order to execute the screen printing operation.
The present invention configured as described above can achieve the following effects.
Since the metal masks having different printing patterns can be integrally manufactured, the manufacturing cost of the metal masks can be significantly reduced while improving the convenience of metal mask management and minimizing the space required for storage.
Since screen printing of different print patterns can be performed using a single apparatus, it is possible to reduce the waste of space required for storage of the apparatus caused by the conventional double-rail configuration and to save the installation cost of the apparatus.
Since the printed pattern is adapted by the automated engineering using the monorail configuration and confirming the printed pattern by means of the view unit, it is possible to significantly reduce the possibility of occurrence of a working error in which the printed circuit board is thrown into a device having a different printed pattern, and thereby reduce waste of resources and working man-hours required for correcting the working error.
Since the printed circuit board introduced from the shuttle unit is to be mounted to the transfer unit located at the center of the apparatus and the metal mask is to be moved after confirming the printing pattern corresponding to the printed circuit board, it is possible to ensure that the printed circuit board is stably fixed and thereby to remarkably improve the quality of screen printing. This is because, in a general method of performing a work after moving a transfer unit on which a printed circuit board is placed to a metal mask corresponding to its own print pattern, there is a possibility that the printed circuit board may be shaken or may be out of position during the movement, which may result in a reduction in print quality.
By moving only the position of the metal mask, the transfer unit and the equipment for performing screen printing are continuously operated at only one position without any variation, thereby further improving the printing quality and the convenience of installation of the equipment.
Drawings
Fig. 1 is an overall structural view of a screen printer equipped with a mask unit capable of printing different patterns to which a preferred embodiment of the present invention is applied.
Fig. 2 is an overall structural view of a shuttle unit of a screen printer equipped with a mask unit capable of printing different patterns to which a preferred embodiment of the present invention is applied.
Fig. 3 is an overall structural view of a mask unit of a screen printer equipped with a mask unit capable of printing different patterns to which a preferred embodiment of the present invention is applied.
Fig. 4 is a structural view illustrating the position of a mask unit when a screen printing operation is performed on an a substrate in a screen printing machine equipped with a mask unit capable of printing different patterns to which a preferred embodiment of the present invention is applied.
Fig. 5 is a structural view illustrating the position of a mask unit when performing a screen printing operation on a B substrate in a screen printing machine equipped with a mask unit capable of printing different patterns to which a preferred embodiment of the present invention is applied.
Description of the reference numerals
10: main body
20: shuttle unit
30: view unit
40: transfer unit
50: mask unit
100: side substrate
110: damper
200: conveyor
210: roller shaft
211: drive roller
213: driven roller
230: leather belt
300: shuttle unit ball screw
400: shuttle unit guide block
500: shuttle unit guide rod
600: metal mask part
700: shuttle unit guide
710: driving motor
730: mask unit ball screw
750: mask unit guide block
800: fixing part
810: side plate
830: fixing main body
831: filling device
850: lower base
Detailed Description
Next, a screen printer equipped with a mask unit capable of printing different patterns to which the preferred embodiment of the present invention is applied will be described in detail with reference to the accompanying drawings.
FIG. 1 is an overall structural view of a screen printer equipped with a mask unit capable of printing different patterns to which a preferred embodiment of the present invention is applied, figure 2 is an overall block diagram of a shuttle unit of a screen printing machine equipped with a mask unit capable of printing different patterns to which a preferred embodiment of the present invention is applied, fig. 3 is an overall structural view of a mask unit of a screen printer equipped with a mask unit capable of printing different patterns to which a preferred embodiment of the present invention is applied, fig. 4 is a structural view illustrating the position of a mask unit when a screen printing operation is performed on an a substrate in a screen printing machine equipped with a mask unit capable of printing different patterns to which a preferred embodiment of the present invention is applied, fig. 5 is a structural view illustrating the position of a mask unit when performing a screen printing operation on a B substrate in a screen printing machine equipped with a mask unit capable of printing different patterns to which a preferred embodiment of the present invention is applied.
As shown in fig. 1, the screen printing machine equipped with the mask unit 50 capable of printing different patterns according to the preferred embodiment of the present invention includes a main body 10, a shuttle unit 20, a view unit 30, a transfer unit 40, and a mask unit 50, and then, with respect to general components in the entire configuration of the screen printing machine, detailed description thereof will be omitted, and only components having technical features will be described.
The shuttle unit 20 including the technical features of the present invention is installed in the lateral central portion of the main body 10 at a position for introducing and extracting the printed circuit board, as shown in fig. 2, and includes a lateral substrate 100, a conveyor 200, a shuttle unit ball screw 300, a shuttle unit guide block 400, and a shuttle unit guide rod 500.
For convenience of description, in the following description, an upper direction in an oblique view of the shuttle unit 20 illustrated in fig. 2 is defined as an upper portion, a lower direction is defined as a lower portion, a side of the middle for transferring the printed circuit board is defined as an inner portion, and an outer side opposite to the inner portion is defined as an outer portion.
First, the side substrate 100 will be described.
The side substrate 100 is a base for mounting components of the conveyor 200, the shuttle unit guide block 400, and the shuttle unit guide bar 500, which will be described later, and thereby realizes transfer of the printed circuit board, is formed as a flat plate having a relatively thin thickness compared to an area, and can be mounted along a length direction in accordance with a moving direction of the printed circuit board.
The upper portion of the side substrate 100 can be bent inward, or an impact absorbing damper 110 for preventing an impact in a direction perpendicular to a moving direction when the printed circuit board moves is attached to the inner side.
On the inner surface of the side substrate 100, a small hole through which a shuttle unit ball screw 300 to be described later can be passed can be formed, whereby a shuttle unit guide block 400 having a thread inside can be fixedly installed.
Next, the transmitter 200 will be explained.
A plurality of rollers 210 can be mounted on the inner surface of the side substrate 100. The plurality of rollers 210 include a driving roller 211 driven by a motor and a driven roller 213 interlocked therewith, and a belt 230 for transmitting a driving force of the driving roller 211 to the driven roller 213 can be attached thereto.
The plurality of driven rollers 213 are arranged in a row at the same phase in the moving direction of the printed circuit board at the upper portion of the side substrate 100, and can receive the driving force of the driving roller 211 arranged at the lower portion of the side substrate 100 through the belt 230 and drive the driven rollers 213.
The printed circuit board is mounted to an upper portion of the belt 230 positioned on an upper portion of the side substrate 100, so that it can be stably transferred to the inside of the screen printer by the driving of the belt 230.
Next, the shuttle unit ball screw 300 will be explained.
The shuttle unit ball screw 300 may be rotated by an external motor, may have a screw thread, and may be penetratingly mounted in a direction perpendicular to the longitudinal direction of the side substrate 100. The end of the shuttle unit ball screw 300 can be fixedly attached to one side of the two side substrates 100 disposed to face each other and can be penetrated and attached to the other side. This is because the distance between the two side substrates 100 can be advantageously adjusted by allowing the side substrate 100 through which the shuttle unit ball screw 300 passes to move and fixing the other side substrate 100 so that it cannot move.
The side substrate 100 can be linearly moved by interaction with a shuttle unit ball screw 400, which will be described later, while the shuttle unit ball screw 300 is rotated. Since the linear movement of the side substrate 100 is achieved by the interaction of the shuttle unit guide block 400 and the shuttle unit guide bar 500, it will be explained in the following.
Next, the shuttle unit guide block 400 will be explained.
The shuttle unit guide block 400 may be fixedly mounted to an inner surface or an outer surface of the side substrate 400, may be fixedly mounted to the inner surface in consideration of interference with other components and safety issues, and may be fixedly mounted to only one side of the two side substrates 100 disposed to face each other.
A small hole having a thread is included at the center of the shuttle unit guide block 400 so as to be capable of being screw-coupled with the shuttle unit ball screw 300 as described above, and the shuttle unit ball screw 400 is linearly moved by interacting with the shuttle unit ball screw 300 by means of the screw-coupling with the shuttle unit guide block 400 when the shuttle unit ball screw 300 rotates.
Next, the shuttle unit guide lever 500 will be explained.
The shuttle unit guide bar 500 guides the moving direction of the side substrate 100 and ensures smooth movement without deflection.
The shuttle unit guide rods 500 can be mounted to the inside of the two side substrates 100 and can be mounted side by side in a direction perpendicular to the moving direction of the printed circuit board, i.e., the mounting direction of the shuttle unit ball screws 300. The shuttle unit guide bar 500 can be fixedly mounted to the side substrate 100 at one side and penetratingly mounted at one side.
The process of adjusting the interval of the side substrate 100 of the shuttle unit is as follows. When the shuttle unit ball screw 300 is rotated by the motor, the shuttle unit guide block 400 threadedly coupled thereto will also be rotated together. At this time, since the shuttle unit guide block 400 is fixedly mounted to the side substrate 100, it is not rotated upon receiving the transmitted rotational force, thereby ensuring only linear movement along the thread of the shuttle unit ball screw 300.
With the movement of the shuttle unit guide block 400 as described above, the side substrates 100 fixedly coupled thereto will also move together, and the interval between the side substrates 100 will be adjusted in the process as described above. In particular, since the movement of the side substrate 100 can be controlled by the shuttle unit ball screw 300, the precise adjustment of the interval can be achieved.
Next, a mask unit 50 including the technical features of the present invention will be explained.
The mask unit 50 is mounted on the upper portion of the main body 10, and includes a metal mask portion 600, a mask unit guide portion 700, and a fixing portion 800, as shown in fig. 3.
First, the metal mask portion 600 will be described.
In the metal mask part 600, a plurality of different printing patterns are perforated. Preferably, the mask unit is formed in a rectangular frame shape, and the outer frame is preferably formed in a rectangular shape having a constant width so that the mask unit can be transferred and pressed by the mask unit guide 700 and the fixing part 800, which will be described later.
The metal mask portion 600 is fixed to a fixing portion 800 to be described later, and since the fixing portion 800 moves by the mask unit guide portion 700, the metal mask can be moved finally.
Next, the mask unit guide 700 will be explained.
The mask unit guide 700 is attached to an outer surface of a fixing portion 800 to be described later, so that the fixing portion 800 can be moved to a predetermined position, and the metal mask portion 600 can be transferred in a direction perpendicular to a moving direction of the printed circuit board.
The mask unit guide 700 includes a driving motor 710, a mask unit ball screw 730, and a mask unit guide block 750.
The driving motor 710 is formed at an outer side surface of the guide portion to provide a rotational force to the mask unit ball screw 730. The driving motor 710 can be installed in a vertical or horizontal manner with respect to the mask unit ball screw 730, and is preferably installed in a vertical manner in order to enable precise control using a gear ratio.
The mask unit ball screw 730 is attached to an outer side surface of a side plate 810 of a fixing portion 800 to be described later, one side is fixedly attached to one end of the mask unit 50, and the other side is fixedly attached to the side plate 810 of the fixing portion 800. Here, the fixed mounting means a state in which the position of the mask unit ball screw 730 is fixed but is rotatable.
The mask unit guide block 750 is fixedly mounted to the side plate 810 of the fixing part 800, and has a small hole having a thread formed therein. The mask unit ball screw 730 passes through the small hole of the mask unit guide block 750 and is screw-coupled thereto.
The mask unit ball screw 730 and the mask unit guide block 750 operate in the same manner as the above-described operation method for adjusting the interval of the shuttle unit 20 with respect to each other in the combination of the shuttle unit ball screw 300 and the shuttle unit guide block 400.
In order to more accurately control the movement of the metal mask part 600, the mask unit guide part 700 is preferably attached to only one side of the fixing part 800.
Finally, the fixing part 800 will be explained.
The fixing part 800 is used to fix the metal mask part 600 by pressurizing it at the upper part and providing support at the lower part, thereby preventing it from shaking during the screen printing operation. Further, since the metal mask portion 600 is fixed and the fixing portion 800 is moved by the mask unit guide 700 as described above, the metal mask portion 600, which requires the screen printing operation, can be selectively transferred to the operation position.
The fixing part 800 includes a side plate 810, a fixing body 830, and a lower base 850.
The side plates 810 are flat plates that are attached in a direction parallel to the moving direction of the metal mask portion 600 and have a thickness relatively smaller than the area, and the two side plates 810 are attached to face each other.
The side plate 810 is attached with a fixing body 830 on an inner surface thereof while supporting the metal mask part 600 on a side surface thereof, and is attached with a mask unit ball screw 730 on an outer surface thereof and a mask unit guide block 750 on an outer surface thereof.
A plurality of fixing bodies 830 are fixedly mounted on an inner surface of the side plate 810. A loader 831 drawn out downward is installed in the fixing body 830, and when the metal mask portion 600 is present, a predetermined area of the edge of the metal mask portion 600 is pressed downward by the drawn loader 831.
A plurality of lower bases 850 formed to protrude inward are fixedly attached to the lower portion of the side plate 810. The lower base 850 is configured to receive the metal mask portion 600, and more specifically, as described above, when the loader 831 drawn out from the inside of the fixing body 830 presses the upper surface of the metal mask portion 600 downward, the lower base 850 supports the lower surface of the metal mask portion 600 upward.
Preferably, the lower base 850 and the fixing body 830 can be installed on the same vertical axis, so that it is possible to provide strong support for the downward pressure pressurized by the loader 831 and thereby more firmly fix the metal mask part 600.
Next, a process of moving the metal mask portion 600 of the mask unit 50 to a predetermined position will be described. The metal mask part 600 is positioned on the upper side of the lower base 850 of the fixing part 800, and is pressed downward by the loader 831 drawn out from the fixing body 830 of the fixing part 800, thereby fixing the metal mask between the side plates 810.
When the view unit 30 selects a metal mask corresponding to the printed circuit board and the driving motor 710 of the mask unit guide 700 is driven, the mask unit ball screw 730 rotates. When the mask unit ball screw 730 rotates, the mask unit guide block 750 screwed thereto is also rotated together, and since the mask unit guide block 750 is fixedly mounted to the outer side surface of the side plate 810 of the fixing part 800, the mask unit guide block 750 linearly moves along the mask unit ball screw 730.
As the mask unit guide block 750 moves linearly, the side plate of the fixing part 800 fixedly coupled thereto is also moved, and the metal mask part 600 fixed by the fixing part 800 is moved to a predetermined position, so that the metal mask corresponding to the printed circuit board is moved to a position where the screen printing work is performed, and thereby the printing work of different printing patterns is performed by a single screen printer.
The embodiments described above are merely exemplary, and those having ordinary skill in the relevant art can implement other embodiments having various modifications thereto.
Therefore, the true technical scope of the present invention should be determined by the technical idea of the present invention described in the claims below, and other various modified embodiments in addition to the above-described embodiments should be included.
Claims (3)
1. A screen printing machine equipped with a mask unit capable of printing different patterns, characterized in that:
in a printed circuit board screen printer composed of a main body, a shuttle unit, a view unit and a transfer unit,
the screen printing is performed by sequentially supplying printed circuit boards different in print pattern,
the above shuttle unit, comprising:
a side substrate in a flat plate shape and mounted side by side in a moving direction of the printed circuit board;
a conveyor mounted on an inner surface of the side substrate;
a shuttle unit ball screw mounted so as to penetrate the side substrate;
a shuttle unit guide block fixedly mounted on an inner surface of the side substrate and moving the side substrate in accordance with rotation of the shuttle unit ball screw; and the number of the first and second groups,
a shuttle unit guide bar installed at a lower portion of the side substrate and formed long in a direction perpendicular to a moving direction of the printed circuit board to guide the movement of the side substrate in the side direction,
the mask unit includes:
a metal mask part for perforating different printing patterns;
a mask unit guide part for transferring the metal mask part along a direction perpendicular to a moving direction of the printed circuit board in order to move the metal mask part to a screen printing operation position; and the number of the first and second groups,
and a fixing part for pressing the metal mask part at the upper part in order to execute the screen printing operation.
2. The screen printing machine equipped with mask units capable of printing different patterns according to claim 1, wherein:
the mask unit guide includes:
a drive motor;
a mask unit ball screw rotated by the driving motor; and the number of the first and second groups,
and a mask unit guide block, which is fixedly mounted to a side surface of the fixing portion so that the mask unit ball screw penetrates therethrough, and which moves the fixing portion in accordance with the rotational movement of the mask unit ball screw.
3. The screen printing machine equipped with mask units capable of printing different patterns according to claim 1, wherein:
the fixing portion includes:
a side plate in a flat plate shape, installed to be perpendicular to a side surface of the metal mask portion, and formed to have a length corresponding to a length of the side surface of the metal mask portion;
a plurality of fixing bodies, each of which is mounted on the inner side surface of the side plate and is provided with a loader which is led out from the inside of the fixing body to the lower part and presses the upper surface of the metal mask part downwards; and the number of the first and second groups,
and a lower base mounted on a lower portion of the side plate and protruding toward an inner surface of the side plate to support a lower surface of the metal mask portion upward.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020170164457A KR101857203B1 (en) | 2017-12-01 | 2017-12-01 | Screen printer with masking unit that could print different patten |
| KR10-2017-0164457 | 2017-12-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109866501A CN109866501A (en) | 2019-06-11 |
| CN109866501B true CN109866501B (en) | 2021-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811325227.8A Active CN109866501B (en) | 2017-12-01 | 2018-11-08 | Screen printing machine with mask unit capable of printing different patterns |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR101857203B1 (en) |
| CN (1) | CN109866501B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102286823B1 (en) * | 2021-02-05 | 2021-08-06 | 주식회사 에스알엔디 | A Screen Printing Device and Roll-to-Roll Substrate Fabricating Aapparatus having the same |
| KR102601870B1 (en) * | 2022-11-28 | 2023-11-13 | 김봉선 | Screen printer for fpcb mounting capable of printing heterogeneous printing patterns with one rail |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109866501A (en) | 2019-06-11 |
| KR101857203B1 (en) | 2018-05-11 |
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