CN112497528A - Arc-shaped cutting machine for road pavement marble slabs - Google Patents
Arc-shaped cutting machine for road pavement marble slabs Download PDFInfo
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- CN112497528A CN112497528A CN202011362173.XA CN202011362173A CN112497528A CN 112497528 A CN112497528 A CN 112497528A CN 202011362173 A CN202011362173 A CN 202011362173A CN 112497528 A CN112497528 A CN 112497528A
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- 238000005520 cutting process Methods 0.000 title claims abstract description 77
- 239000004579 marble Substances 0.000 title claims abstract description 30
- 230000005540 biological transmission Effects 0.000 claims abstract description 52
- 230000007246 mechanism Effects 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 238000003825 pressing Methods 0.000 claims description 12
- 239000010865 sewage Substances 0.000 claims description 7
- 239000002173 cutting fluid Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 3
- 239000011449 brick Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/22—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by cutting, e.g. incising
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D7/00—Accessories specially adapted for use with machines or devices of the preceding groups
- B28D7/02—Accessories specially adapted for use with machines or devices of the preceding groups for removing or laying dust, e.g. by spraying liquids; for cooling work
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
The invention discloses an arc-shaped cutting machine for road pavement marble slabs, which comprises a base, a workbench, a power transmission mechanism, an upright post, a cutting mechanism and a rotary support frame, wherein the work bench is arranged on the base; the upright post is fixed at one end of the base, and the workbench is fixed at the other end of the base; one end of the rotary support frame is sleeved with the upright post through a shaft sleeve, the power transmission mechanism is fixed at the other end of the rotary support frame, the cutting mechanism is fixed at the bottom of the power transmission mechanism, the power transmission mechanism comprises a power box and a transmission box, and a motor is arranged in the power box; a cam, a connecting rod, a guide sleeve and a U-shaped sleeve are arranged in the transmission box; the cutting mechanism comprises a tool rest, a cutter and a locking ring; the threaded end part of the tool rest is connected in a central threaded hole at the bottom of the U-shaped sleeve through threads, and the other end of the tool rest is provided with a tool clamping groove; the cutter is arranged in the cutter clamping groove; the locking ring is sleeved with the cutter clamping groove and is fixedly connected with one end of the cutter rest. The arc cutting machine can stably cut stone materials in an arc line, can cut stone materials with different thicknesses, is time-saving and labor-saving, and meets the use requirements.
Description
Technical Field
The invention belongs to the technical field of stone processing for road pavement, and particularly relates to an arc-shaped cutting machine for marble slabs for road pavement.
Background
In urban modern construction, urban traffic is used as infrastructure construction to occupy an important position, and corresponding auxiliary roads are arranged on two sides of a main lane for pedestrians to use; in the aspect of road paving, marble, pavement bricks, water permeable bricks and the like are often adopted, and particularly, the thickness of a marble plate is 3-5 cm, the texture is hard, and the cutting wastes time and labor; and sometimes can need to carry out the enclosed type around the root of afforestation trees or sewer well head and mat formation, need carry out the pitch arc to the stone material and cut the transformation, but appear following problem among the prior art:
1) the existing cutting means is mainly directed at straight linear cutting and is difficult to perform arc cutting according to requirements;
2) the existing cutting means mostly adopt manual portable electric cutters to cut stones, particularly common marble plates, and arc-shaped route cutting cannot be realized during cutting due to the influence of the diameter of a cutting piece; the cutting surface similar to the required arc-shaped cut can be realized only by polishing after multiple times of linear cutting, and moreover, the cutting is irregular, so that the gap is large and is not attractive; meanwhile, the marble plate cannot be fixed, and safety accidents are easy to happen.
3) The existing curve saw cutting cannot realize arc cutting on the marble above 3 cm.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides the arc-shaped marble plate cutting machine for road pavement, which can stably cut stone materials for road pavement in an arc manner, can cut stone materials with different thicknesses, is time-saving and labor-saving, and meets the use requirements.
In order to achieve the purpose, the invention adopts the technical scheme that:
an arc-shaped cutting machine for road pavement marble slabs comprises a base, a workbench, a power transmission mechanism, an upright post, a cutting mechanism and a rotary support frame; the upright post is fixed at one end of the base, and the workbench is fixed at the other end of the base; one end of the rotary support frame is sleeved with the upright post through the shaft sleeve, the power transmission mechanism is fixed at the other end of the rotary support frame, and the cutting mechanism is fixed at the bottom of the power transmission mechanism.
The base comprises a fixed table, a water tank and a chassis; the upper part of the chassis is provided with a water tank, the fixed platform is arranged at the top of the water tank, the bottom of the fixed platform is provided with a supporting frame, and the fixed platform is buckled on the water tank through the supporting frame; a fan-shaped blanking groove and a guide groove are formed in the fixed table;
the water tank comprises a clear water tank and a sewage tank which are independent from each other; the sewage tank is positioned below the fan-shaped blanking groove; a water pump is arranged in the clear water tank.
The bottom of the workbench is provided with a guide block and is arranged in a guide groove of the fixed table; the workbench is provided with a T-shaped groove, a bolt, a nut and a pressing plate, the bolt is located in the T-shaped groove, one end of the pressing plate presses a workpiece, the other end of the pressing plate is in lap joint with the workbench, and the pressing plate penetrates through the bolt and is fixed through the nut to press the workpiece.
The rotary support frame comprises a fixed plate and a guide rail; the fixed plate is provided with a shaft sleeve sleeved stand column, and the guide rail is fixedly connected with the side edge of the fixed plate through a bolt.
The power transmission mechanism comprises a power box and a transmission box; one end of the power box is fixedly connected with the transmission box; the two sides of the transmission box are provided with slide blocks which are movably connected with the guide rail; two ends of the sliding block are provided with buckles; one side of the transmission box is provided with a water pipe connected with a water pump, and the other end of the water pipe provides cooling cutting fluid for the cutting mechanism.
A motor is arranged in the power box; a cam, a connecting rod, a guide sleeve and a U-shaped sleeve are arranged in the transmission box; the output shaft of the motor is connected with a cam shaft at one end of a cam in the transmission box through a coupling; the camshaft is movably connected to the transmission box through a bearing, and one end of the connecting rod is movably connected with the other end of the cam through a fixed shaft; the other end of the connecting rod is provided with a pin shaft which is fixedly connected with a U-shaped sleeve; one end of the guide sleeve is provided with threads, the guide sleeve is movably connected with a bottom plate of the transmission box through the threads, and the U-shaped sleeve is positioned inside the guide sleeve; the one end that the screw thread was established to the uide bushing is equipped with the lock sleeve and is located the transmission case outside.
The cutting mechanism comprises a tool rest, a cutter and a locking ring; one end of the tool rest is provided with a thread and a locking nut, and the locking nut is movably connected with the end part of the thread of the tool rest; the threaded end part of the tool rest is connected in a central threaded hole at the bottom of the U-shaped sleeve through threads, and the other end of the tool rest is provided with a tool clamping groove; the cutter is arranged in the cutter clamping groove; the relative height of the tool rest relative to the U-shaped sleeve is adjusted by rotating the adjusting locking nut, the included angle between the tool clamping groove on the tool rest and the tangent line of the arc-shaped cutting of the workpiece is further adjusted, and the cutter smoothly cuts into the workpiece; the locking ring is sleeved with the cutter clamping groove and is fixedly connected to one end of the cutter rest.
A fixed arm is arranged at the bottom of the transmission box; the other end of the fixed arm is provided with a bracket; the support is provided with a leaning wheel and clings to the cutter.
The supporting mechanism is arranged on the upright post, external threads are arranged on the outer portion of the upright post, and the supporting mechanism comprises a thrust ball bearing, a lead screw nut and a locking device; the thrust ball bearing is positioned at the bottom of the rotary support frame; the screw nut is located thrust ball bearing bottom, and screw nut meshing stand external screw thread, locking ware are located the screw nut bottom, prevent that screw nut when cutting the work piece, and the vibration makes screw nut fall back and descend, influences among the cutting mechanism cutter striking work piece.
Compared with the prior art, the invention has the beneficial effects that:
1) the cutting mechanism is provided with a bracket and a depended wheel; the idler wheel is attached to the cutter, so that the functions of stabilizing the cutter and guiding can be realized in the cutting process;
2) the stand column is used as a main supporting piece, the power transmission mechanism and the cutting mechanism are dragged by the supporting plate to rotate by taking the stand column as an axis, and arc cutting is realized;
3) the workstation can be adjusted according to building stones cutting requirement and size of a dimension, is equipped with T type groove cooperation and bolt and clamp plate on the workstation simultaneously and fixes the building stones, has avoided the emergence of the incident that causes because of unable fixed building stones when workman's manual cutting.
Drawings
FIG. 1 is a schematic structural view of an arc-shaped cutting machine for road pavement marble slabs, which is disclosed by the invention;
FIG. 2 is a schematic structural diagram of a power transmission mechanism and a cutting mechanism in the arc-shaped cutting machine for the road pavement marble slabs, which is disclosed by the invention;
FIG. 3 is a schematic cross-sectional view of a cutting mechanism of the arc-shaped cutting machine for road pavement marble slabs according to the present invention;
FIG. 4 is a schematic structural diagram of a water tank in the arc-shaped cutting machine for the road pavement marble slabs, disclosed by the invention;
FIG. 5 is a schematic structural diagram of a workbench in the arc-shaped cutting machine for road pavement marble slabs, which is disclosed by the invention;
in the figure: 1. a base; 11. a fixed table; 111. a fan-shaped blanking groove; 112. a support frame; 12. a work table; 121. a T-shaped groove; 13. a water tank; 131. a clear water tank; 1311. a water pump; 132. a sewage tank; 14. a chassis; 2. a power transmission mechanism; 21. a power box; 211. a motor; 22. a transmission box; 221. a water pipe; 23. a slider; 231. buckling; 24. a cam; 25. a connecting rod; 251. a pin shaft; 26. a guide sleeve; 27. a locking sleeve; 28. a U-shaped sleeve; 3. a support mechanism; 31. rotating the support frame; 311. a fixing plate; 312. a guide rail; 32. a column; 33. a thrust ball bearing; 34. a lead screw nut; 35. a lock; 4. a cutting mechanism; 41. a tool holder; 411. a thread; 412. locking the nut; 413. a knife clamping groove; 42. locking a ring; 43. a cutter; 44. a fixed arm; 45. a support; 451. a wheel.
Detailed Description
For the convenience of understanding of those skilled in the art, the technical solution of the present invention will be further described in detail with reference to fig. 1 to 5.
An arc-shaped cutting machine for road pavement marble slabs comprises a base 1, a workbench 12, a power transmission mechanism 2, a stand column 32, a cutting mechanism 4 and a rotary support frame 31; the upright column 32 is fixed at one end of the base 1, and the workbench 12 is fixed at the other end of the base 1; one end of the rotary support frame 31 is sleeved with the upright column 32 through a shaft sleeve, the power transmission mechanism 2 is fixed at the other end of the rotary support frame 31, and the cutting mechanism 4 is fixed at the bottom of the power transmission mechanism 2.
The base 1 comprises a fixed table 11, a water tank 13 and a chassis 14; the upper part of the chassis 14 is provided with a water tank 13, the fixed platform 11 is arranged at the top of the water tank 13, the bottom of the fixed platform 11 is provided with a supporting frame 112, and the fixed platform 11 is buckled on the water tank 13 through the supporting frame 112; a fan-shaped blanking groove 111 and a guide groove are formed in the fixed table 11;
the water tank 13 comprises a clean water tank 131 and a sewage tank 132 which are independent water tanks; the sewage tank 132 is positioned below the fan-shaped blanking trough 111; a water pump 1311 is arranged in the clean water tank 131.
The bottom of the working table 12 is provided with a guide block and is arranged in a guide groove of the fixed table 11; the workbench 12 is provided with a T-shaped groove 121, a bolt, a nut and a pressing plate, the bolt is located in the T-shaped groove 121, one end of the pressing plate presses a workpiece, the other end of the pressing plate is connected onto the workbench 12 in an overlapping mode, and the pressing plate penetrates through the bolt and is fixed through the nut to press the workpiece.
The rotating support frame 31 comprises a fixing plate 311 and a guide rail 312; the fixing plate 311 is provided with a shaft sleeve sleeved upright post 32, and the guide rail 312 is fixedly connected with the side edge of the fixing plate 311 through a bolt.
The power transmission mechanism 2 comprises a power box 21 and a transmission box 22; one end of the power box 21 is fixedly connected with a transmission box 22; the two sides of the transmission box 22 are provided with slide blocks 23 which are movably connected with guide rails 312 through the slide blocks 23; two ends of the sliding block 23 are provided with buckles 231; one side of the transmission box 22 is provided with a water pipe 221 connected with a water pump 1311, and the other end of the water pipe provides cooling cutting fluid for the cutting mechanism.
A motor 211 is arranged in the power box 21; a cam 24, a connecting rod 25, a guide sleeve 26 and a U-shaped sleeve 28 are arranged in the transmission box 22; the output shaft of the motor 211 is connected with a cam shaft at one end of a cam 24 in the transmission box 22 through a coupling; the camshaft is movably connected to the transmission box 22 through a bearing, and one end of the connecting rod 25 is movably connected with the other end of the cam 24 through a shaft sleeve; the other end of the connecting rod 25 is provided with a pin shaft 251, and the pin shaft 251 is fixedly connected with a U-shaped sleeve 28; one end of the guide sleeve 26 is provided with threads and is movably connected with the bottom plate of the transmission box 22 through the threads, and the U-shaped sleeve 28 is positioned inside the guide sleeve 26; the end of the guiding sleeve 26 provided with the thread is provided with a locking sleeve 27 and is positioned outside the transmission box 22.
The cutting mechanism 4 comprises a tool rest 41, a cutting knife 43 and a locking ring 42; one end of the tool holder 41 is provided with a thread 411 and a locking nut 412, the locking nut 412 is movably connected with the thread end part of the tool holder 41, the thread end part of the tool holder 41 is connected in a central thread hole at the bottom of the U-shaped sleeve 28 through a thread, and the other end of the tool holder 41 is provided with a tool clamping groove 413; the cutting knife 43 is arranged in the knife clamping groove 413; by rotating the adjusting lock nut 412, the relative height of the tool post 41 relative to the U-shaped sleeve 28 is further adjusted, the included angle between the tool clamping groove 413 on the tool post 41 and the tangent line of the arc-shaped cutting of the workpiece is further adjusted, and the cutting knife 43 smoothly cuts into the workpiece; the locking ring 42 is sleeved with the tool clamping groove and fixedly connected to one end of the tool rest.
The bottom of the transmission box 22 is provided with a fixed arm 44; the other end of the fixed arm 44 is provided with a bracket 45; the support 45 is provided with a idler wheel 451 which is tightly attached to and abutted against the cutter 43.
The upright post 32 is provided with a support mechanism 3, external threads are arranged on the outer portion of the upright post 32, and the support mechanism 3 comprises a thrust ball bearing 33, a screw nut 34 and a locking device 35; the thrust ball bearing 33 is positioned at the bottom of the rotating support frame 31; the lead screw nut 34 is located at the bottom of the thrust ball bearing 33, the lead screw nut 34 is meshed with the external thread of the upright post 32, and the locking device 35 is located at the bottom of the lead screw nut 34, so that the lead screw nut 34 is prevented from descending backwards due to vibration when the lead screw nut 34 cuts a workpiece, and the impact of a cutter 43 in the cutting mechanism 4 on the workpiece is prevented.
The utility model provides a be used for road paving marble slab arc cutting machine, the working process as follows:
whether the cutting fluid is sufficient in the water tank is checked firstly, the height of the rotary support frame relative to the stand column is adjusted, then the cutter is installed, the cutting radius of the cutter relative to the center of the stand column in the cutting mechanism is adjusted, the position of the workbench and the marble slab are fixedly installed, the machine is started for idle cutting, the cutter is washed by the cutting fluid, and finally the stand column is used as the center of a circle to push the rotary support frame to drive the cutter in the cutting mechanism to perform arc cutting on the marble slab.
The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.
Claims (10)
1. An arc-shaped cutting machine for road pavement marble slabs comprises a base, a workbench, a power transmission mechanism, an upright post, a cutting mechanism and a rotary support frame; the device is characterized in that the upright post is fixed at one end of the base, and the workbench is fixed at the other end of the base; one end of the rotary support frame is sleeved with the upright post through the shaft sleeve, the power transmission mechanism is fixed at the other end of the rotary support frame, and the cutting mechanism is fixed at the bottom of the power transmission mechanism.
2. The arc cutting machine for road paving marble slabs according to claim 1, wherein said base comprises a fixed table, a water tank, a chassis; the upper part of the chassis is provided with a water tank, the fixed platform is arranged at the top of the water tank, the bottom of the fixed platform is provided with a supporting frame, and the fixed platform is buckled on the water tank through the supporting frame; and the fixed table is provided with a fan-shaped blanking groove and a guide groove.
3. The arc cutting machine for road paving marble slabs according to claim 1, wherein said water tank comprises a clean water tank and a sewage tank, both of which are independent water tanks; the sewage tank is positioned below the fan-shaped blanking groove; a water pump is arranged in the clear water tank.
4. The arc cutting machine for road paving marble slabs as claimed in claim 1, wherein a guide block is provided at the bottom of the worktable and is disposed in a guide groove of the fixed table; the workbench is provided with a T-shaped groove, a bolt, a nut and a pressing plate, the bolt is located in the T-shaped groove, one end of the pressing plate presses a workpiece, the other end of the pressing plate is in lap joint with the workbench, and the pressing plate penetrates through the bolt and is fixed through the nut to press the workpiece.
5. The arc cutting machine for road paving marble slabs according to claim 1, wherein said rotating support frame comprises a fixed plate and a guide rail; the fixed plate is provided with a shaft sleeve sleeved stand column, and the guide rail is fixedly connected with the side edge of the fixed plate through a bolt.
6. The arc cutting machine for road paving marble slabs according to claim 1, wherein said power transmission mechanism comprises a power box, a transmission box; one end of the power box is fixedly connected with the transmission box; the two sides of the transmission box are provided with slide blocks which are movably connected with the guide rail; two ends of the sliding block are provided with buckles; one side of the transmission box is provided with a water pipe connected with a water pump, and the other end of the water pipe provides cooling cutting fluid for the cutting mechanism.
7. The arc cutting machine for road paving marble slabs as claimed in claim 1, wherein a motor is provided in said power box; a cam, a connecting rod, a guide sleeve and a U-shaped sleeve are arranged in the transmission box; the output shaft of the motor is connected with a cam shaft at one end of a cam in the transmission box through a coupling; the camshaft is movably connected to the transmission box through a bearing, and one end of the connecting rod is movably connected with the other end of the cam through a fixed shaft; the other end of the connecting rod is provided with a pin shaft which is fixedly connected with a U-shaped sleeve; one end of the guide sleeve is provided with threads, the guide sleeve is movably connected with a bottom plate of the transmission box through the threads, and the U-shaped sleeve is positioned inside the guide sleeve; the one end that the screw thread was established to the uide bushing is equipped with the lock sleeve and is located the transmission case outside.
8. The arc cutting machine for road paving marble slabs according to claim 1, wherein said cutting mechanism comprises a knife rest, a cutting knife, a locking ring; one end of the tool rest is provided with a thread and a locking nut, and the locking nut is movably connected with the end part of the thread of the tool rest; the threaded end part of the tool rest is connected in a central threaded hole at the bottom of the U-shaped sleeve through threads, and the other end of the tool rest is provided with a tool clamping groove; the cutter is arranged in the cutter clamping groove; the locking ring is sleeved with the cutter clamping groove and is fixedly connected to one end of the cutter rest.
9. The arc-shaped marble plate cutting machine for road pavement according to claim 1, wherein a fixed arm is arranged at the bottom of the transmission box; the other end of the fixed arm is provided with a bracket; the support is provided with a leaning wheel and clings to the cutter.
10. The arc cutting machine for the road paving marble slabs as claimed in claim 1, wherein a support mechanism is arranged on the upright, external threads are arranged on the exterior of the upright, and the support mechanism comprises a thrust ball bearing, a screw nut and a locking device; the thrust ball bearing is positioned at the bottom of the rotary support frame; the screw nut is located thrust ball bearing bottom, and screw nut meshing stand external screw thread, locking ware are located the screw nut bottom, prevent that screw nut when cutting the work piece, and the vibration makes screw nut fall back and descend, influences among the cutting mechanism cutter striking work piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011362173.XA CN112497528A (en) | 2020-11-27 | 2020-11-27 | Arc-shaped cutting machine for road pavement marble slabs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011362173.XA CN112497528A (en) | 2020-11-27 | 2020-11-27 | Arc-shaped cutting machine for road pavement marble slabs |
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| Publication Number | Publication Date |
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| CN112497528A true CN112497528A (en) | 2021-03-16 |
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| CN202011362173.XA Pending CN112497528A (en) | 2020-11-27 | 2020-11-27 | Arc-shaped cutting machine for road pavement marble slabs |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114347178A (en) * | 2022-01-19 | 2022-04-15 | 陈春 | Bending leg cutting forming equipment for processing round stool |
| CN114701073A (en) * | 2021-12-16 | 2022-07-05 | 成都承奥科技有限公司 | Processing and detection equipment for inner arc surface arc-shaped groove |
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| CN114701073A (en) * | 2021-12-16 | 2022-07-05 | 成都承奥科技有限公司 | Processing and detection equipment for inner arc surface arc-shaped groove |
| CN114701073B (en) * | 2021-12-16 | 2023-09-22 | 成都承奥科技有限公司 | Inner cambered surface arc groove processing and detecting equipment |
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Application publication date: 20210316 |