CN111195789A - Special automatic welding machine for stator core of elevator motor - Google Patents
Special automatic welding machine for stator core of elevator motor Download PDFInfo
- Publication number
- CN111195789A CN111195789A CN201811383932.3A CN201811383932A CN111195789A CN 111195789 A CN111195789 A CN 111195789A CN 201811383932 A CN201811383932 A CN 201811383932A CN 111195789 A CN111195789 A CN 111195789A
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- China
- Prior art keywords
- welding
- stator core
- guide rail
- jig
- operation platform
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- Pending
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/006—Safety devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/02—Carriages for supporting the welding or cutting element
- B23K37/0247—Driving means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/02—Carriages for supporting the welding or cutting element
- B23K37/0252—Steering means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/0426—Fixtures for other work
- B23K37/0435—Clamps
- B23K37/0443—Jigs
Abstract
The invention provides an automatic special welding machine for an elevator motor stator iron core, which comprises a base, an operation platform welding jig frame, a rotary dividing disc, a welding gun moving and lifting mechanism, a pressing mechanism and an electric control cabinet, wherein a protective cover is arranged above the base; according to the invention, the electric control cabinet controls the rotary dividing plate, the welding gun moving and lifting mechanism and the pressing mechanism, so that the stator core of the motor can be automatically welded, the automation degree is high, compared with the traditional manual welding, the welding gun moving and lifting mechanism has the advantages of high precision and high accuracy, the error problem caused by manual objective factors can not occur, the welded stator core has small welding seams, the strength of the welded stator core is high, and the welding production cost can be effectively reduced.
Description
Technical Field
The invention relates to the field of motor stator cores, in particular to a special automatic welding machine for an elevator motor stator core.
Background
The motor stator iron core is formed by laminating and fixing silicon steel sheets, and the production process comprises the following steps: punching → quantitative → laminating-fastening, the fastening mode of the iron core comprises a cramp method, a riveting method, a screw fastening method, a bonding method and a welding method, the cramp method, the riveting method, the screw fastening method and the bonding method are gradually replaced by the welding method due to the complex working procedures, more man-hour, low production efficiency, serious waste of metal materials and the like, and the welding fastening method of the iron core is to weld a plurality of welding seams longitudinally on the outer circular wall of the stacked stator at a certain distance, so that the surface layers of each silicon steel sheet are mutually welded to form a whole stator. The stator core is the main component of the stator, the stator is the main component of the motor, the stator mainly functions to generate a rotating magnetic field, the rotor mainly functions to be cut by magnetic lines of force in the rotating magnetic field to generate (output) current, and the welding quality of the stator core directly affects the performance of the motor.
The existing stator core welding technology is generally manual welding, the manual welding of the stator core has the defects of low production efficiency, high labor intensity and high rejection rate of the welded stator core, and the product quality is easily influenced by subjective factors of a welder. Therefore, the invention provides a special automatic welding machine for a stator core of an elevator motor, which aims to overcome the defects in the prior art.
Disclosure of Invention
Aiming at the problems, the electric control cabinet controls the rotary dividing disc, the welding gun moving and lifting mechanism and the pressing mechanism, so that the stator core of the motor can be automatically welded, the automation degree is high, compared with the traditional manual welding, the electric control cabinet has the advantages of high precision and high accuracy, the error problem caused by manual objective factors can not occur, the welded stator core has small welding seams, and meanwhile, the welded stator core has high strength, so that the welding production efficiency is accelerated, the labor consumption is reduced, and the welding production cost can be effectively reduced.
The invention provides an automatic special welding machine for stator iron cores of elevator motors, which comprises a base, an operation platform welding jig frame, a rotary indexing disc, a welding gun moving and lifting mechanism, a pressing mechanism and an electric control cabinet, wherein a protective cover is arranged above the base, a pneumatic cabinet is arranged on the inner side wall of the protective cover, the operation platform welding jig frame is arranged in the protective cover above the base, the rotary indexing disc is arranged on the upper surface of the operation platform welding jig frame, the welding gun moving and lifting mechanisms are arranged on two sides of the rotary indexing disc, the welding gun moving and lifting mechanism comprises a moving guide rail and an electric lifting guide rail, the moving guide rails are symmetrically arranged on the operation platform welding jig frame on two sides of the rotary indexing disc, a welding support seat is arranged on each moving guide rail, the electric lifting guide rails are arranged on the inner sides of the welding support seats, two groups of the electric lifting, the welding jig is characterized in that a pressing mechanism is arranged on the welding jig frame of the operating platform, the pressing mechanism is matched with the rotary dividing plate in position, an electrical control cabinet is arranged on one side of the welding jig frame of the operating platform on the base, and the rotary dividing plate, the welding gun moving and lifting mechanism and the pressing mechanism are all connected with the electrical control cabinet.
The further improvement lies in that: the base is concave, and the convex part of base inboard is equipped with safe grating board.
The further improvement lies in that: an opening is formed in the upper portion of the protective cover, and the opening is matched with the position of the pressing mechanism.
The further improvement lies in that: the interior of the operation platform welding jig frame is of a hollow structure, a bin door is arranged on the front side of the operation platform welding jig frame, and heat dissipation holes are formed in the side wall of the operation platform welding jig frame.
The further improvement lies in that: the pressing mechanism comprises a stand column, a cross beam and a driving cylinder, the stand column is arranged on the welding jig frame of the operating platform, the cross beam is arranged above the stand column and is longitudinally and horizontally arranged with the rotary dividing plate, the driving cylinder is arranged on the cross beam, and the output end of the driving cylinder is connected with the positioning upper die of the workpiece to be processed.
The further improvement lies in that: the rotary indexing disc comprises a servo motor speed reducer, a driving gear, a rotary support and an indexing disc body, the operating platform is provided with the servo motor speed reducer through an installation frame in a welding jig frame, an output shaft of the servo motor speed reducer is provided with the driving gear, three groups of driven gears are meshed on the outer side of the driving gear, the rotary support is meshed on the outer side of the driven gears, the operating platform is provided with the indexing disc body above the welding jig frame, and the indexing disc body is connected with the rotary support.
The further improvement lies in that: the movable guide rail comprises a first servo motor, a first lead screw and a first guide rail, the first servo motor is arranged on one side above the welding jig frame of the operating platform, the first lead screw is arranged at the output end of the first servo motor, the first guide rail is arranged on two sides of the first lead screw above the welding jig frame of the operating platform, and the first guide rail is connected with the welding support seat in a sliding mode.
The further improvement lies in that: the electric lifting guide rail comprises a second servo motor, a second lead screw and a second guide rail, the second servo motor is arranged above the inner side of the welding support seat, the output end of the second servo motor is provided with the second lead screw, the second guide rail is arranged on the two sides of the second lead screw on the inner side surface of the welding support seat, and the second guide rail is connected with the welding machine in a sliding mode.
The invention has the beneficial effects that: through electrical control cabinet control gyration graduated disk, welder removes elevating system and hold-down mechanism, can realize automatic welding motor stator core, degree of automation is high, manual welding traditional relatively has the precision height, the advantage that the accuracy is high, the error problem because artifical objective factor causes can not appear, the stator core welding seam of welding out is little, welded stator core intensity is high simultaneously, the artifical labour consumption has been reduced when having accelerated welding production efficiency, can effectual reduction welding production cost, can prevent through safe grating board that the people is close to the machining region in the course of working, welding production's security has been improved.
Drawings
Fig. 1 is a perspective view of the present invention.
Fig. 2 is a schematic view of the protective cover structure of the present invention.
Fig. 3 is a schematic structural view of the rotary indexing disc of the present invention.
Fig. 4 is a schematic view of the structure of the moving guide rail of the present invention.
Fig. 5 is a schematic view of the structure of the electric lifting rail of the present invention.
Fig. 6 is a schematic structural view of the working principle of the rotary indexing disc of the invention.
Wherein: 1-base, 2-operation platform welding jig frame, 3-rotary indexing disc, 4-welding gun moving lifting mechanism, 5-pressing mechanism, 6-electric control cabinet, 7-protective cover, 8-pneumatic cabinet, 9-moving guide rail, 10-electric lifting guide rail, 11-welding support seat, 12-welding machine, 13-safe grating plate, 14-opening, 15-bin door, 16-heat dissipation hole, 17-upright post, 18-cross beam, 19-driving cylinder, 20-servo motor reducer, 21-driving gear, 22-rotary support, 23-indexing disc body, 24-driven gear, 25-first servo motor, 26-first screw rod, 27-first guide rail, 28-second servo motor, and, 29-a second screw rod and 30-a second guide rail.
Detailed Description
In order to make the technical means, objectives and functions of the invention easy to understand, the invention will be further described with reference to the following embodiments.
According to the figures 1, 2, 3, 4, 5 and 6, the automatic welding special machine for the stator core of the elevator motor comprises a base 1, an operation platform welding jig frame 2, a rotary dividing plate 3, a welding gun moving and lifting mechanism 4, a pressing mechanism 5 and an electric control cabinet 6, wherein a protective cover 7 is arranged above the base 1, a pneumatic cabinet 8 is arranged on the inner side wall of the protective cover 7, the operation platform welding jig frame 2 is arranged inside the protective cover 7 above the base 1, the rotary dividing plate 3 is arranged on the upper surface of the operation platform welding jig frame 2, the welding gun moving and lifting mechanisms 4 are arranged on two sides of the rotary dividing plate 3, the welding gun moving and lifting mechanism 4 comprises a moving guide rail 9 and an electric lifting guide rail 10, the moving guide rails 9 are symmetrically arranged on the operation platform welding jig frames 2 on two sides of the rotary dividing plate 3, and a welding support seat 11 is arranged on the moving guide rail, 11 inboards of welding support seat are equipped with electric lift rail 10, electric lift rail 10 is equipped with two sets ofly, and is two sets of all be equipped with welding machine 12 on the electric lift rail 10, operation platform welds and is equipped with hold-down mechanism 5 on the dress bed-jig 2, hold- down mechanism 5 and 3 position looks adaptations of gyration graduated disk, operation platform welds dress bed-jig 2 one side and is equipped with electrical control cabinet 6 on the base 1, gyration graduated disk 3, welder remove elevating system 4 and hold-down mechanism 5 all connect electrical control cabinet 6.
The base 1 is concave, and a safety grating plate 13 is arranged on the inner side of the convex part of the base 1.
An opening 14 is arranged above the protective cover 7, and the opening 14 is matched with the position of the pressing mechanism 5.
The interior of the operation platform welding jig frame 2 is of a hollow structure, a bin gate 15 is arranged on the front side of the operation platform welding jig frame 2, and heat dissipation holes 16 are formed in the side wall of the operation platform welding jig frame 2.
Hold-down mechanism 5 includes stand 17, crossbeam 18 and drives actuating cylinder 19, operating platform welds and is equipped with stand 17 on the dress bed-jig 2, the stand 17 top is equipped with crossbeam 18, crossbeam 18 is vertical level setting with gyration graduated disk 3, be equipped with on the crossbeam 18 and drive actuating cylinder 19, drive the mould on the location of actuating cylinder 19 output connection work piece of waiting to process.
Gyration graduated disk 3 includes servo motor speed reducer 20, driving gear 21, slewing bearing 22 and graduation disk body 23, operation platform welds 2 inside servo motor speed reducer 20 that are equipped with through the mounting bracket of dress bed-jig, servo motor speed reducer 20 output shaft is equipped with driving gear 21, the meshing of driving gear 21 outside has three driven gear 24 of group, the meshing of driven gear 24 outside has slewing bearing 22, operation platform welds 2 tops of dress bed-jig and is equipped with graduation disk body 23, graduation disk body 23 is connected with slewing bearing 22.
The movable guide rail 9 comprises a first servo motor 25, a first lead screw 26 and a first guide rail 27, the first servo motor 25 is arranged on one side above the operation platform welding jig frame 2, the first lead screw 26 is arranged at the output end of the first servo motor 25, the first lead screw 26 on the operation platform welding jig frame 2 is arranged on two sides of the first lead screw 26, and the first guide rail 27 is connected with the welding support seat 11 in a sliding mode.
Through 6 control gyration graduated disks 3 of electrical control cabinet, welder removes elevating system 4 and hold-down mechanism 5, can realize automated welding motor stator core, degree of automation is high, manual welding traditional relatively has the precision height, the high advantage of accuracy, the error problem because artifical objective factor causes can not appear, the stator core welding seam of welding out is little, welded stator core intensity is high simultaneously, the artifical labour consumption has been reduced when having accelerated welding production efficiency, can effectual reduction welding manufacturing cost, can prevent through safe grating board 13 that the people is close to the machining region in the course of working, welding production's security has been improved.
The working principle is as follows: when the stator iron core of the elevator motor is processed, the stator iron core to be welded and the positioning upper and lower dies are manually placed on the indexing disc body 23, the electric control cabinet 6 controls the driving cylinder 19 of the pressing mechanism 5 to press downwards according to a program, pressing force is applied to the positioning upper and lower dies, the pneumatic system of the pneumatic cabinet 8 fixedly positions the upper and lower dies and the stator iron core, then a person exits from a processing area, the bin door 15 is closed, the electric control cabinet 6 controls the welding gun to move the movable guide rail 9 of the lifting mechanism 4 according to a set position, meanwhile, the electric lifting guide rail 10 starts to move to a specified position according to the set position, the welding machine 12 starts to weld the stator iron core, the servo motor reducer 20 of the rotary indexing disc 3 works in the welding process, the driving gear 21 of the output shaft is driven to rotate, the driving gear 21 drives the driven gear 24 to rotate, thereby the graduation disk body 23 drives the upper die and the lower die which are positioned and the stator core synchronously rotate to carry out welding processing of different angles, in the welding process, when people enter the safety grating board 13, the safety grating board 13 senses and then gives a signal to the electric control cabinet 6 to immediately stop the operation of the welding machine 12, the safety protection effect is achieved, when workers load and unload workpieces or overhaul equipment in the equipment, the signal is given to the electric control cabinet 6 after the grating senses, no matter how a peripheral worker presses a start button, all actions are invalid, after the processing is finished, the pneumatic cabinet 8 is closed, the hold-down mechanism 5 is loosened, the stator core which is welded is taken down manually, another stator core to be processed is placed at the hold-down mechanism to be fixed, and the stator core processing of the next round can be carried out.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. Elevator motor stator core automatic weld special plane, its characterized in that: the welding jig comprises a base (1), an operation platform welding jig frame (2), a rotary dividing disc (3), a welding gun moving and lifting mechanism (4), a pressing mechanism (5) and an electric control cabinet (6), wherein a protective cover (7) is arranged above the base (1), a pneumatic cabinet (8) is arranged on the inner side wall of the protective cover (7), the operation platform welding jig frame (2) is arranged inside the protective cover (7) above the base (1), the rotary dividing disc (3) is arranged on the upper surface of the operation platform welding jig frame (2), the welding gun moving and lifting mechanisms (4) are arranged on two sides of the rotary dividing disc (3), each welding gun moving and lifting mechanism (4) comprises a moving guide rail (9) and an electric lifting guide rail (10), the moving guide rails (9) are symmetrically arranged on the operation platform welding jig frame (2) on two sides of the rotary dividing disc (3), and a welding support seat (11) is arranged on each moving guide rail (9, welding support seat (11) inboard is equipped with electric lift guide (10), electric lift guide (10) are equipped with two sets ofly, and are two sets ofly all be equipped with welding machine (12) on electric lift guide (10), operating platform welds and is equipped with hold-down mechanism (5) on dress bed-jig (2), hold-down mechanism (5) and gyration graduated disk (3) position looks adaptation, operating platform welds dress bed-jig (2) one side and is equipped with electrical control cabinet (6) on base (1), gyration graduated disk (3), welder remove elevating system (4) and hold-down mechanism (5) all connect electrical control cabinet (6).
2. The automatic welding special machine for the stator core of the elevator motor according to claim 1, characterized in that: the base (1) is concave, and a safety grating plate (13) is arranged on the inner side of the convex part of the base (1).
3. The automatic welding special machine for the stator core of the elevator motor according to claim 1, characterized in that: an opening (14) is formed in the upper portion of the protective cover (7), and the opening (14) is matched with the position of the pressing mechanism (5).
4. The automatic welding special machine for the stator core of the elevator motor according to claim 1, characterized in that: the operation platform welds dress bed-jig (2) inside and is hollow structure, operation platform welds dress bed-jig (2) front side and is equipped with door (15), operation platform welds and is equipped with louvre (16) on dress bed-jig (2) lateral wall.
5. The automatic welding special machine for the stator core of the elevator motor according to claim 1, characterized in that: hold-down mechanism (5) include stand (17), crossbeam (18) and drive actuating cylinder (19), operating platform welds and is equipped with stand (17) on dress bed-jig (2), stand (17) top is equipped with crossbeam (18), crossbeam (18) are vertical level setting with gyration graduated disk (3), be equipped with on crossbeam (18) and drive actuating cylinder (19), it connects the mould on the location of treating the processing work piece to drive actuating cylinder (19) output.
6. The automatic welding special machine for the stator core of the elevator motor according to claim 4, characterized in that: gyration graduated disk (3) include servo motor speed reducer (20), driving gear (21), slewing bearing (22) and graduation disk body (23), operation platform welds dress bed-jig (2) inside and is equipped with servo motor speed reducer (20) through the mounting bracket, servo motor speed reducer (20) output shaft is equipped with driving gear (21), the meshing of driving gear (21) outside has three driven gear of group (24), driven gear (24) outside meshing has slewing bearing (22), operation platform welds dress bed-jig (2) top and is equipped with graduation disk body (23), graduation disk body (23) are connected with slewing bearing (22).
7. The automatic welding special machine for the stator core of the elevator motor according to claim 1, characterized in that: remove guide rail (9) and include first servo motor (25), first lead screw (26) and first guide rail (27), operation platform welds dress bed-jig (2) top one side and is equipped with first servo motor (25), first servo motor (25) output is equipped with first lead screw (26), operation platform welds dress bed-jig (2) top first lead screw (26) both sides and is equipped with first guide rail (27), first guide rail (27) and welding support seat (11) sliding connection.
8. The automatic welding special machine for the stator core of the elevator motor according to claim 1, characterized in that: electric lift guide rail (10) include second servo motor (28), second lead screw (29) and second guide rail (30), the inboard top of weld holder seat is equipped with second servo motor (28), second servo motor (28) output is equipped with second lead screw (29), the both sides of weld holder seat (11) inboard surface second lead screw (29) are equipped with second guide rail (30), second guide rail (30) and welding machine (12) sliding connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811383932.3A CN111195789A (en) | 2018-11-20 | 2018-11-20 | Special automatic welding machine for stator core of elevator motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811383932.3A CN111195789A (en) | 2018-11-20 | 2018-11-20 | Special automatic welding machine for stator core of elevator motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111195789A true CN111195789A (en) | 2020-05-26 |
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ID=70741513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811383932.3A Pending CN111195789A (en) | 2018-11-20 | 2018-11-20 | Special automatic welding machine for stator core of elevator motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111195789A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130074986A (en) * | 2011-12-27 | 2013-07-05 | 주식회사 포스코 | Clamppinng apparatus for core welding |
| CN103433637A (en) * | 2013-08-26 | 2013-12-11 | 大连交通大学 | Automatic welding device and welding method for stators |
| CN203356889U (en) * | 2013-06-08 | 2013-12-25 | 允博（天津）电机科技发展有限公司 | Stator core vertical automatic welding device |
| CN103962689A (en) * | 2014-03-24 | 2014-08-06 | 伟本机电（上海）有限公司 | Argon arc welding dedicated machine for lift motor stator core |
| CN205464738U (en) * | 2016-03-29 | 2016-08-17 | 河南鑫桃源机械股份有限公司 | Turn round wrench movement mechanism of welding machine |
| CN206561228U (en) * | 2017-03-24 | 2017-10-17 | 常州神力电机股份有限公司 | A kind of motor stator core automatic electric weld(ing) system |
-
2018
- 2018-11-20 CN CN201811383932.3A patent/CN111195789A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130074986A (en) * | 2011-12-27 | 2013-07-05 | 주식회사 포스코 | Clamppinng apparatus for core welding |
| CN203356889U (en) * | 2013-06-08 | 2013-12-25 | 允博（天津）电机科技发展有限公司 | Stator core vertical automatic welding device |
| CN103433637A (en) * | 2013-08-26 | 2013-12-11 | 大连交通大学 | Automatic welding device and welding method for stators |
| CN103962689A (en) * | 2014-03-24 | 2014-08-06 | 伟本机电（上海）有限公司 | Argon arc welding dedicated machine for lift motor stator core |
| CN205464738U (en) * | 2016-03-29 | 2016-08-17 | 河南鑫桃源机械股份有限公司 | Turn round wrench movement mechanism of welding machine |
| CN206561228U (en) * | 2017-03-24 | 2017-10-17 | 常州神力电机股份有限公司 | A kind of motor stator core automatic electric weld(ing) system |
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Application publication date: 20200526 |