CN110076544B - Pneumatic differential assembly machine - Google Patents
Pneumatic differential assembly machine Download PDFInfo
- Publication number
- CN110076544B CN110076544B CN201910506768.9A CN201910506768A CN110076544B CN 110076544 B CN110076544 B CN 110076544B CN 201910506768 A CN201910506768 A CN 201910506768A CN 110076544 B CN110076544 B CN 110076544B
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- piece
- supporting surface
- pressure cylinder
- cylinder
- riveting
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- 238000003825 pressing Methods 0.000 claims abstract description 56
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- 238000004080 punching Methods 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 4
- 101100491335 Caenorhabditis elegans mat-2 gene Proteins 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
- B23P19/027—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same using hydraulic or pneumatic means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Actuator (AREA)
- Portable Nailing Machines And Staplers (AREA)
Abstract
The pneumatic differential assembly machine comprises a left pressure cylinder, a right pressure cylinder and a middle riveting cylinder, wherein a first pneumatic regulating valve is arranged on a total gas path for supplying gas to the left pressure cylinder, the right pressure cylinder and the middle riveting cylinder, and a second pneumatic regulating valve is arranged on a branch gas path for supplying gas to the middle riveting cylinder; the driving piece of the left pressure cylinder and the driving piece of the right pressure cylinder are fixedly connected with a pressing piece capable of moving up and down; a stamping rod capable of moving up and down is arranged in the lower pressing piece and fixedly connected with a driving piece of the middle riveting cylinder; and a riveting backflushing piece is arranged below the stamping rod and is provided with a first supporting surface and a second supporting surface, and the distance between the first supporting surface and the second supporting surface is slightly larger than the distance between the lower bottom surface of the lower cover of the precise flow regulator and the lower bottom surface of the buckling column. The invention not only can mechanically assemble the precise flow regulator, thereby having the characteristics of high assembly efficiency and stable assembly quality, but also can realize the nondestructive buckling of contact surfaces during assembly and ensure the assembly quality of products.
Description
The invention relates to an air pressure differential assembly machine for assembling a precise flow regulator.
Background
A precise flow regulator is disclosed in the patent document No. ZL201520531736.1, and is assembled from a lower cover, a rubber pad, an upper cover, and a pin. In the assembly process, the rubber pad is firstly placed into the lower cover, then the upper cover and the lower cover are buckled, and finally the pin column is inserted into the lower cover. Because no special assembling tool is used, the existing manual assembly is performed manually, so that the problems of low assembly efficiency, unstable assembly quality and the like exist; in addition, in the assembly process of buckling the upper cover, the lower cover and the inserted pin, the buckling contact surface of the buckling post of the lower cover is mutually clung to the buckling contact surface of the rotating hole post of the upper cover, and the buckling contact surface is damaged due to friction and extrusion, so that the buckling effectiveness is affected.
Disclosure of Invention
The invention aims to solve the technical problem of providing an air pressure differential assembly machine for mechanically assembling a precise flow regulator, which has the characteristics of high assembly efficiency, stable assembly quality and no damage to buckling contact surfaces during assembly.
In order to solve the technical problems, the invention adopts the following technical scheme: the pneumatic differential assembly machine comprises a left pressure cylinder, a right pressure cylinder and a middle riveting cylinder, wherein a first pneumatic regulating valve is arranged on a total gas path for supplying gas to the left pressure cylinder, the right pressure cylinder and the middle riveting cylinder, and a second pneumatic regulating valve is arranged on a branch gas path for supplying gas to the middle riveting cylinder; the driving piece of the left pressure cylinder and the driving piece of the right pressure cylinder are fixedly connected with a pressing piece capable of moving up and down; a stamping rod capable of moving up and down is arranged in the lower pressing piece and fixedly connected with a driving piece of the middle riveting cylinder; and a riveting backflushing piece is arranged below the stamping rod and is provided with a first supporting surface and a second supporting surface, and the distance between the first supporting surface and the second supporting surface is slightly larger than the distance between the lower bottom surface of the lower cover of the precise flow regulator and the lower bottom surface of the buckling column.
The working mode of the invention is as follows: firstly, manually placing a lower cover on a riveting backflushing piece, wherein at the moment, the lower bottom surface of a buckling column of the lower cover is placed on a first supporting surface of the riveting backflushing piece, and the lower bottom surface of the lower cover is suspended at a bit above a second supporting surface at the moment because the distance between the first supporting surface and the second supporting surface is slightly larger than the distance between the lower bottom surface of the lower cover of the precise flow regulator and the lower bottom surface of the buckling column; then, the rubber pad is manually placed into the lower cover, then the upper cover is placed on the lower cover, the rotating hole column of the upper cover is sleeved on the buckling column of the lower cover for a small part, and then the pin column is placed into the buckling column for a small part; then, the pneumatic differential assembly machine of the present invention is started. The driving falling speeds of the left pressure cylinder and the right pressure cylinder can be controlled by adjusting the first air pressure adjusting valve in advance, and the driving falling speeds of the middle riveting pressure cylinder can be controlled by adjusting the second air pressure adjusting valve in advance, so that the driving falling speeds of the middle riveting pressure cylinder are slower than the driving falling speeds of the left pressure cylinder and the right pressure cylinder. The left pressure cylinder and the right pressure cylinder drive the lower pressing piece to fall, the lower pressing piece is pressed on the upper surface of the upper cover, the rotating hole column of the upper cover is further enabled to be sleeved on the buckling column of the lower cover downwards, after the side wall of the upper cover descends to be in contact with the side wall of the lower cover, the side wall of the lower cover is enabled to deform downwards until contacting with the second supporting surface of the riveting recoil piece, the buckling column is enabled to rise upwards, therefore, the buckling contact surface of the buckling column is higher than the buckling contact surface of the rotating hole column, a gap exists between the two buckling contact surfaces, and when the upper cover and the lower cover are buckled, the two buckling contact surfaces are not damaged due to tight friction and extrusion, so that buckling effectiveness is guaranteed. Because the first air pressure regulating valve and the second air pressure regulating valve are regulated in advance, the stamping rod driven by the middle riveting air cylinder is slower than the pressing down of the pressing down piece driven by the left pressure air cylinder and the right pressure air cylinder to form a differential motion, when the stamping rod promotes the pin column to be inserted into the buckling column, the buckling column is lifted, and the two buckling contact surfaces are not damaged due to the fact that gaps exist between the two buckling contact surfaces and are also clung to friction and extrusion. After the buckling of the upper cover, the lower cover and the insertion of the pin are completed, the lower pressing piece and the punching rod go upwards, and the lower cover is restored to the original state, so that the buckling contact surface can be damaged during assembly, and the buckling effectiveness is ensured.
The invention not only can mechanically assemble the precise flow regulator, thereby having the characteristics of high assembly efficiency and stable assembly quality, but also can realize the nondestructive buckling of contact surfaces during assembly and ensure the assembly quality of products.
The pin is inserted into the buckling column, so that buckling failure of the upper cover and the lower cover caused by shrinkage of the buckling column can be prevented. In order to further ensure that the pin cannot fall off from the buckling column, the top of the riveting recoil piece is provided with a conical body, the bottom of the pin collides with the conical body in the process of inserting the pin into the buckling column, the bottom of the pin is outwards fried to form a reverse buckling curled edge, and therefore the pin is prevented from falling off from the buckling column.
In consideration of the fact that the precise flow regulator is made of plastic, the strength of the precise flow regulator is not very high, and the elastic deformation quantity is not very large, so that the precise flow regulator is further provided with a left limiting support vertical plate and a right limiting support vertical plate for strictly limiting the maximum pressing stroke of a pressing piece, the left limiting support vertical plate is provided with a step-shaped left limiting support surface, the right limiting support vertical plate is provided with a step-shaped right limiting support surface, the left limiting support surface and the right limiting support surface are positioned at the same height, and the left limiting support surface and the right limiting support surface are all positioned on the pressing path of the pressing piece. The left limit supporting surface and the right limit supporting surface can prevent the pressing piece from further descending, thereby achieving the purpose of limiting the maximum pressing stroke of the pressing piece.
In order to facilitate manufacturing and assembly and reduce production cost, the lower pressing piece is further designed to comprise a lower pressing plate and a lower pressing block, the lower pressing plate is fixedly connected to the driving piece of the left pressure cylinder and the driving piece of the right pressure cylinder, and the lower pressing block for pressing the upper cover is arranged on the lower surface of the lower pressing plate.
In order to ensure the accuracy of the downward movement of the pressing piece, a left guide post and a right guide post in the up-down direction are further arranged, the lower pressing plate is sleeved on the left guide post and the right guide post, and the downward movement of the lower pressing plate is accurately guided by the left guide post and the right guide post.
The air pressure value of the total air passage is further set between 6.0 and 8.0Mpa, so that the lower pressure can be controlled, the precise flow regulator cannot be impacted greatly, and the assembly speed is high.
The air pressure value of the total air path is further set to 7.0Mpa, which is the optimal balance point of the pressing impact force and the assembling speed.
The distance between the first supporting surface and the second supporting surface of the riveting recoil piece is further set to be 0.25-0.35mm larger than the distance between the lower bottom surface of the lower cover of the precise flow regulator and the lower bottom surface of the buckling column, so that the lower cover can be forced to have sufficient deformation and can be prevented from being deformed and damaged.
The distance between the first supporting surface and the second supporting surface of the riveting recoil piece is further set to be 0.3mm larger than the distance between the lower bottom surface of the lower cover of the precise flow regulator and the lower bottom surface of the buckling column, and the distance is the optimal balance point between sufficient deformation and deformation damage of the lower cover.
Drawings
FIG. 1 is a schematic diagram of a precision flow regulator;
FIG. 2 is a schematic diagram of the structure of the present invention;
FIG. 3 is a schematic view of the structure of the present invention with the air supply circuit and the air control section removed;
fig. 4 is a schematic structural view of parts of the punching rod, the pressing block and the riveting recoil piece in the invention when the punching rod and the pressing block are pressed down.
The reference numerals in the figures are respectively:
1-lower cover, 2-rubber pad, 3-upper cover, 4-pin, 5-buckling column, 6-rotation hole column,
7-the lower bottom surface of the lower cover, 8-the lower bottom surface of the buckling column, 9-the side wall of the upper cover and 10-the side wall of the lower cover;
the device comprises a lower fixing plate 11-a left limit supporting vertical plate 12-a left limit supporting surface 121-a right limit supporting vertical plate 13-a right limit supporting surface 131-a right limit supporting surface 14-an upper supporting plate 15-a left guide pillar and a right guide pillar 16-a right guide pillar;
21-left pressure cylinder, 22-right pressure cylinder, 23-middle riveting cylinder;
31-lower pressing plates and 32-lower pressing blocks;
41-punching a rod;
51-a total gas path, 52-a first gas pressure regulating valve, 53-an electromagnetic reversing valve, 54-a branch gas path and 55-a second gas pressure regulating valve;
61-riveting recoil piece, 611-first supporting surface, 612-second supporting surface, 613-conical body.
Detailed Description
In order to describe the technical content, the constructional features, the achieved objects and effects of the present invention in detail, the following description is made in connection with the embodiments and the accompanying drawings.
Referring to fig. 1, a precision flow regulator comprises a lower cover 1, a rubber mat 2, an upper cover 3 and a pin 4, wherein a buckling column 5 is arranged in the lower cover 1, a rotating hole column 6 is arranged in the upper cover 3, the upper cover 3 and the lower cover 1 form rotatable buckling connection through buckling of the rotating hole column 6 and the buckling column 5, the pin 4 is inserted into the buckling column 5, and the rubber mat 2 is positioned between the upper cover 3 and the lower cover 1. For the assembly of the precise flow regulator, firstly, the rubber mat 2 is put into the lower cover 1, then the upper cover 3 is buckled with the lower cover 1, and finally the pin 4 is inserted into the lower cover 1.
Referring to fig. 2, 3 and 4, the pneumatic differential assembly machine of the present invention can mechanically complete the assembly of the precise flow regulator. The pneumatic differential assembly machine comprises a lower fixing plate 11, wherein a left limiting support vertical plate 12 is arranged on the left upper surface of the lower fixing plate 11, a right limiting support vertical plate 13 is arranged on the right upper surface of the lower fixing plate 11, a step-shaped left limiting support surface 121 is arranged in the middle of the left limiting support vertical plate 12, a step-shaped right limiting support surface 131 is arranged in the middle of the right limiting support vertical plate 13, and the left limiting support surface 121 and the right limiting support surface 131 are positioned at the same height.
An upper support plate 14 is mounted on top of the left and right limit support risers 12, 13. A left guide post 15 and a right guide post 16 in the up-down direction are provided in a frame formed by the lower fixing plate 11, the left limit supporting vertical plate 12, the right limit supporting vertical plate 13, and the upper supporting plate 14.
On the upper support plate 14, a left pressure cylinder 21 located at the left part, a right pressure cylinder 22 located at the right part, and a middle riveting cylinder 23 located in the middle are installed, and the left pressure cylinder 21, the right pressure cylinder 22, and the middle riveting cylinder 23 are all disposed downward. The driving parts of the left pressure cylinder 21 and the right pressure cylinder 22 are fixedly connected with a lower pressing plate 31, the lower pressing plate 31 is sleeved on the left guide post 15 and the right guide post 16, and a lower pressing block 32 for pressing the upper cover 3 is arranged on the lower surface of the lower pressing plate 31. The left pressure cylinder 21 and the right pressure cylinder 22 can drive the lower pressing plate 31 and the lower pressing block 32 to press the upper cover 3 downwards along the left guide post 15 and the right guide post 16 to be buckled on the lower cover 1. When the lower pressing plate 31 moves downwards, the left limiting supporting surface 121 of the left limiting supporting vertical plate 12 and the right limiting supporting surface 131 of the right limiting supporting vertical plate 13 are limited at the maximum pressing stroke of the lower pressing plate 31.
The driving piece of the middle riveting air cylinder 23 is fixedly connected with a stamping rod 41, the stamping rod 41 passes through the lower pressing plate 31 and the lower pressing block 32, and the middle riveting air cylinder 23 can drive the stamping rod 41 to downwards press the pin 4 to be inserted into the buckling column 5 of the lower cover 1.
A first air pressure regulating valve 52 and an electromagnetic steering valve 53 are arranged on a total air passage 51 for supplying air to the left pressure cylinder 21, the right pressure cylinder 22 and the middle riveting cylinder 23, the air pressure of the total air passage 51 is controlled to be 7.0Mpa by regulating the first air pressure regulating valve 52, and the left pressure cylinder 21, the right pressure cylinder 22 and the middle riveting cylinder 23 are controlled by the electromagnetic steering valve 53
Realize the drive of turning to upper and lower; a second air pressure regulating valve 55 is provided in the branch air passage 54 for supplying air to the middle riveting cylinder 23. By setting the air pressure of the first air pressure adjusting valve 52 and the second air pressure adjusting valve 55 in advance, the downward movement speed of the press rod 41 driven by the middle press cylinder 23 is slower than the downward movement speed of the lower press block 32 driven by the left press cylinder 21 and the right press cylinder 22 by about 0.5 seconds, and a differential motion is formed.
A rivet back flushing piece 61 is provided on the lower fixing plate 11 below the punching rod 41, the rivet back flushing piece 61 has a first supporting surface 611 and a second supporting surface 612, and the distance between the first supporting surface 611 and the second supporting surface 612 is 0.3mm larger than the distance between the lower bottom surface 7 of the lower cover of the precision flow regulator and the lower bottom surface 8 of the buckling column. When the lower cover 1 is placed on the riveting backflushing member 61, the lower bottom surface 8 of the buckling column of the lower cover 1 is placed on the first supporting surface 611 of the riveting backflushing member 61, and at this time, the lower bottom surface 7 of the lower cover is suspended above the second supporting surface 612 and is 0.3mm away from the second supporting surface 612. When the upper cover 3 is pressed downward to the lower cover 1, the side wall 9 of the upper cover descends until contacting with the side wall 10 of the lower cover, and then the side wall 10 of the lower cover is forced to deform downward until the side wall 10 of the lower cover contacts with the second supporting surface 612 of the riveting recoil piece 61, so that the lower cover 1 is forced to deform elastically, and at the moment, the buckling columns 5 of the lower cover 1 are lifted upward, so that gaps exist between the buckling contact surfaces of the buckling columns 5 and the buckling contact surfaces of the rotating hole columns 6, and friction and extrusion damage cannot occur. After the depression force is released, the lower cover 1 resumes its deformation.
A conical body 613 is provided on the top of the rivet back-flushing piece 61 for riveting the bottom of the pin 4 to form a back-fastening bead.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, and any minor modifications, equivalent variations and modifications made to the above embodiments according to the technical principles of the present invention are still within the scope of the present invention.
Claims (4)
1. The utility model provides an atmospheric pressure differential assembly machine, includes left pressure cylinder, right pressure cylinder and well riveting cylinder, characterized by: a first air pressure regulating valve is arranged on a total air path for supplying air to the left pressure cylinder, the right pressure cylinder and the middle riveting cylinder, and a second air pressure regulating valve is arranged on a branch air path for supplying air to the middle riveting cylinder; the driving piece of the left pressure cylinder and the driving piece of the right pressure cylinder are fixedly connected with a pressing piece capable of moving up and down; a stamping rod capable of moving up and down is arranged in the lower pressing piece and fixedly connected with a driving piece of the middle riveting cylinder; a riveting backflushing piece is arranged below the stamping rod and is provided with a first supporting surface and a second supporting surface, and the distance between the first supporting surface and the second supporting surface of the riveting backflushing piece is 0.25-0.35mm greater than the distance between the lower bottom surface of the lower cover of the precise flow regulator and the lower bottom surface of the buckling column; a conical body is arranged at the top of the riveting recoil piece; the pressing part is characterized by further comprising a left limiting supporting vertical plate and a right limiting supporting vertical plate, wherein a step-shaped left limiting supporting surface is arranged on the left limiting supporting vertical plate, a step-shaped right limiting supporting surface is arranged on the right limiting supporting vertical plate, and the left limiting supporting surface and the right limiting supporting surface are positioned at the same height and are positioned on the pressing path of the pressing part; the lower pressing piece comprises a lower pressing piece and a lower pressing piece, the lower pressing piece is fixedly connected with the driving piece of the left pressure cylinder and the driving piece of the right pressure cylinder, and the lower pressing piece for pressing the upper cover is arranged on the lower surface of the lower pressing piece; the lower pressing plate is sleeved on the left guide post and the right guide post.
2. The pneumatic differential assembly machine according to claim 1, wherein: the air pressure value of the total air path is between 6.0 and 8.0 Mpa.
3. The pneumatic differential assembly machine according to claim 2, wherein: the air pressure value of the total air path is 7.0Mpa.
4. The pneumatic differential assembly machine according to claim 1, wherein: the distance between the first supporting surface and the second supporting surface of the riveting recoil piece is 0.3mm larger than the distance between the lower bottom surface of the lower cover of the precise flow regulator and the lower bottom surface of the buckling column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910506768.9A CN110076544B (en) | 2019-06-12 | 2019-06-12 | Pneumatic differential assembly machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910506768.9A CN110076544B (en) | 2019-06-12 | 2019-06-12 | Pneumatic differential assembly machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110076544A CN110076544A (en) | 2019-08-02 |
| CN110076544B true CN110076544B (en) | 2023-11-17 |
Family
ID=67424103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910506768.9A Active CN110076544B (en) | 2019-06-12 | 2019-06-12 | Pneumatic differential assembly machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110076544B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1719146A1 (en) * | 1990-01-08 | 1992-03-15 | Омский научно-исследовательский институт технологии машиностроения | Apparatus for riveting |
| JP2007061972A (en) * | 2005-08-31 | 2007-03-15 | Showa Corp | Differential gear automatic assembling device |
| CN103143921A (en) * | 2013-04-09 | 2013-06-12 | 苏州工业职业技术学院 | Down riveting-press mechanism for riveting-press assembly machine |
| CN204430724U (en) * | 2014-12-29 | 2015-07-01 | 朱桂林 | A kind of pneumatic press-in device |
| CN105171384A (en) * | 2015-11-05 | 2015-12-23 | 十堰市隆泰源工贸有限公司 | Shaft seat pressing tool |
| CN105436330A (en) * | 2015-12-23 | 2016-03-30 | 苏州博众精工科技有限公司 | Positioning and riveting pressing mechanism |
| CN205885887U (en) * | 2016-05-13 | 2017-01-18 | 东莞市匠泽精密模具塑胶有限公司 | Transfusion bottle floating valve piece |
| CN207522018U (en) * | 2017-09-13 | 2018-06-22 | 杭州辰瀚科技有限公司 | Oil smoke lamp riveted and shrapnel automatic assembly equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6872009B2 (en) * | 2002-08-21 | 2005-03-29 | Finisar Corporation | Bendable optical signal transmitter port |
-
2019
- 2019-06-12 CN CN201910506768.9A patent/CN110076544B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1719146A1 (en) * | 1990-01-08 | 1992-03-15 | Омский научно-исследовательский институт технологии машиностроения | Apparatus for riveting |
| JP2007061972A (en) * | 2005-08-31 | 2007-03-15 | Showa Corp | Differential gear automatic assembling device |
| CN103143921A (en) * | 2013-04-09 | 2013-06-12 | 苏州工业职业技术学院 | Down riveting-press mechanism for riveting-press assembly machine |
| CN204430724U (en) * | 2014-12-29 | 2015-07-01 | 朱桂林 | A kind of pneumatic press-in device |
| CN105171384A (en) * | 2015-11-05 | 2015-12-23 | 十堰市隆泰源工贸有限公司 | Shaft seat pressing tool |
| CN105436330A (en) * | 2015-12-23 | 2016-03-30 | 苏州博众精工科技有限公司 | Positioning and riveting pressing mechanism |
| CN205885887U (en) * | 2016-05-13 | 2017-01-18 | 东莞市匠泽精密模具塑胶有限公司 | Transfusion bottle floating valve piece |
| CN207522018U (en) * | 2017-09-13 | 2018-06-22 | 杭州辰瀚科技有限公司 | Oil smoke lamp riveted and shrapnel automatic assembly equipment |
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|---|---|
| CN110076544A (en) | 2019-08-02 |
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